diff options
Diffstat (limited to 'include/linux/skbuff.h')
| -rw-r--r-- | include/linux/skbuff.h | 4130 |
1 files changed, 3357 insertions, 773 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 5afefa01a13c..86737076101d 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1,49 +1,269 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Definitions for the 'struct sk_buff' memory handlers. * * Authors: * Alan Cox, <gw4pts@gw4pts.ampr.org> * Florian La Roche, <rzsfl@rz.uni-sb.de> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #ifndef _LINUX_SKBUFF_H #define _LINUX_SKBUFF_H #include <linux/kernel.h> -#include <linux/kmemcheck.h> #include <linux/compiler.h> #include <linux/time.h> #include <linux/bug.h> +#include <linux/bvec.h> #include <linux/cache.h> +#include <linux/rbtree.h> +#include <linux/socket.h> +#include <linux/refcount.h> #include <linux/atomic.h> #include <asm/types.h> #include <linux/spinlock.h> -#include <linux/net.h> -#include <linux/textsearch.h> #include <net/checksum.h> #include <linux/rcupdate.h> -#include <linux/dmaengine.h> -#include <linux/hrtimer.h> #include <linux/dma-mapping.h> #include <linux/netdev_features.h> -#include <net/flow_keys.h> +#include <net/flow_dissector.h> +#include <linux/in6.h> +#include <linux/if_packet.h> +#include <linux/llist.h> +#include <linux/page_frag_cache.h> +#include <net/flow.h> +#if IS_ENABLED(CONFIG_NF_CONNTRACK) +#include <linux/netfilter/nf_conntrack_common.h> +#endif +#include <net/net_debug.h> +#include <net/dropreason-core.h> +#include <net/netmem.h> + +/** + * DOC: skb checksums + * + * The interface for checksum offload between the stack and networking drivers + * is as follows... + * + * IP checksum related features + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * Drivers advertise checksum offload capabilities in the features of a device. + * From the stack's point of view these are capabilities offered by the driver. + * A driver typically only advertises features that it is capable of offloading + * to its device. + * + * .. flat-table:: Checksum related device features + * :widths: 1 10 + * + * * - %NETIF_F_HW_CSUM + * - The driver (or its device) is able to compute one + * IP (one's complement) checksum for any combination + * of protocols or protocol layering. The checksum is + * computed and set in a packet per the CHECKSUM_PARTIAL + * interface (see below). + * + * * - %NETIF_F_IP_CSUM + * - Driver (device) is only able to checksum plain + * TCP or UDP packets over IPv4. These are specifically + * unencapsulated packets of the form IPv4|TCP or + * IPv4|UDP where the Protocol field in the IPv4 header + * is TCP or UDP. The IPv4 header may contain IP options. + * This feature cannot be set in features for a device + * with NETIF_F_HW_CSUM also set. This feature is being + * DEPRECATED (see below). + * + * * - %NETIF_F_IPV6_CSUM + * - Driver (device) is only able to checksum plain + * TCP or UDP packets over IPv6. These are specifically + * unencapsulated packets of the form IPv6|TCP or + * IPv6|UDP where the Next Header field in the IPv6 + * header is either TCP or UDP. IPv6 extension headers + * are not supported with this feature. This feature + * cannot be set in features for a device with + * NETIF_F_HW_CSUM also set. This feature is being + * DEPRECATED (see below). + * + * * - %NETIF_F_RXCSUM + * - Driver (device) performs receive checksum offload. + * This flag is only used to disable the RX checksum + * feature for a device. The stack will accept receive + * checksum indication in packets received on a device + * regardless of whether NETIF_F_RXCSUM is set. + * + * Checksumming of received packets by device + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * Indication of checksum verification is set in &sk_buff.ip_summed. + * Possible values are: + * + * - %CHECKSUM_NONE + * + * Device did not checksum this packet e.g. due to lack of capabilities. + * The packet contains full (though not verified) checksum in packet but + * not in skb->csum. Thus, skb->csum is undefined in this case. + * + * - %CHECKSUM_UNNECESSARY + * + * The hardware you're dealing with doesn't calculate the full checksum + * (as in %CHECKSUM_COMPLETE), but it does parse headers and verify checksums + * for specific protocols. For such packets it will set %CHECKSUM_UNNECESSARY + * if their checksums are okay. &sk_buff.csum is still undefined in this case + * though. A driver or device must never modify the checksum field in the + * packet even if checksum is verified. + * + * %CHECKSUM_UNNECESSARY is applicable to following protocols: + * + * - TCP: IPv6 and IPv4. + * - UDP: IPv4 and IPv6. A device may apply CHECKSUM_UNNECESSARY to a + * zero UDP checksum for either IPv4 or IPv6, the networking stack + * may perform further validation in this case. + * - GRE: only if the checksum is present in the header. + * - SCTP: indicates the CRC in SCTP header has been validated. + * - FCOE: indicates the CRC in FC frame has been validated. + * + * &sk_buff.csum_level indicates the number of consecutive checksums found in + * the packet minus one that have been verified as %CHECKSUM_UNNECESSARY. + * For instance if a device receives an IPv6->UDP->GRE->IPv4->TCP packet + * and a device is able to verify the checksums for UDP (possibly zero), + * GRE (checksum flag is set) and TCP, &sk_buff.csum_level would be set to + * two. If the device were only able to verify the UDP checksum and not + * GRE, either because it doesn't support GRE checksum or because GRE + * checksum is bad, skb->csum_level would be set to zero (TCP checksum is + * not considered in this case). + * + * - %CHECKSUM_COMPLETE + * + * This is the most generic way. The device supplied checksum of the _whole_ + * packet as seen by netif_rx() and fills in &sk_buff.csum. This means the + * hardware doesn't need to parse L3/L4 headers to implement this. + * + * Notes: + * + * - Even if device supports only some protocols, but is able to produce + * skb->csum, it MUST use CHECKSUM_COMPLETE, not CHECKSUM_UNNECESSARY. + * - CHECKSUM_COMPLETE is not applicable to SCTP and FCoE protocols. + * + * - %CHECKSUM_PARTIAL + * + * A checksum is set up to be offloaded to a device as described in the + * output description for CHECKSUM_PARTIAL. This may occur on a packet + * received directly from another Linux OS, e.g., a virtualized Linux kernel + * on the same host, or it may be set in the input path in GRO or remote + * checksum offload. For the purposes of checksum verification, the checksum + * referred to by skb->csum_start + skb->csum_offset and any preceding + * checksums in the packet are considered verified. Any checksums in the + * packet that are after the checksum being offloaded are not considered to + * be verified. + * + * Checksumming on transmit for non-GSO + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * The stack requests checksum offload in the &sk_buff.ip_summed for a packet. + * Values are: + * + * - %CHECKSUM_PARTIAL + * + * The driver is required to checksum the packet as seen by hard_start_xmit() + * from &sk_buff.csum_start up to the end, and to record/write the checksum at + * offset &sk_buff.csum_start + &sk_buff.csum_offset. + * A driver may verify that the + * csum_start and csum_offset values are valid values given the length and + * offset of the packet, but it should not attempt to validate that the + * checksum refers to a legitimate transport layer checksum -- it is the + * purview of the stack to validate that csum_start and csum_offset are set + * correctly. + * + * When the stack requests checksum offload for a packet, the driver MUST + * ensure that the checksum is set correctly. A driver can either offload the + * checksum calculation to the device, or call skb_checksum_help (in the case + * that the device does not support offload for a particular checksum). + * + * %NETIF_F_IP_CSUM and %NETIF_F_IPV6_CSUM are being deprecated in favor of + * %NETIF_F_HW_CSUM. New devices should use %NETIF_F_HW_CSUM to indicate + * checksum offload capability. + * skb_csum_hwoffload_help() can be called to resolve %CHECKSUM_PARTIAL based + * on network device checksumming capabilities: if a packet does not match + * them, skb_checksum_help() or skb_crc32c_help() (depending on the value of + * &sk_buff.csum_not_inet, see :ref:`crc`) + * is called to resolve the checksum. + * + * - %CHECKSUM_NONE + * + * The skb was already checksummed by the protocol, or a checksum is not + * required. + * + * - %CHECKSUM_UNNECESSARY + * + * This has the same meaning as CHECKSUM_NONE for checksum offload on + * output. + * + * - %CHECKSUM_COMPLETE + * + * Not used in checksum output. If a driver observes a packet with this value + * set in skbuff, it should treat the packet as if %CHECKSUM_NONE were set. + * + * .. _crc: + * + * Non-IP checksum (CRC) offloads + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * .. flat-table:: + * :widths: 1 10 + * + * * - %NETIF_F_SCTP_CRC + * - This feature indicates that a device is capable of + * offloading the SCTP CRC in a packet. To perform this offload the stack + * will set csum_start and csum_offset accordingly, set ip_summed to + * %CHECKSUM_PARTIAL and set csum_not_inet to 1, to provide an indication + * in the skbuff that the %CHECKSUM_PARTIAL refers to CRC32c. + * A driver that supports both IP checksum offload and SCTP CRC32c offload + * must verify which offload is configured for a packet by testing the + * value of &sk_buff.csum_not_inet; skb_crc32c_csum_help() is provided to + * resolve %CHECKSUM_PARTIAL on skbs where csum_not_inet is set to 1. + * + * * - %NETIF_F_FCOE_CRC + * - This feature indicates that a device is capable of offloading the FCOE + * CRC in a packet. To perform this offload the stack will set ip_summed + * to %CHECKSUM_PARTIAL and set csum_start and csum_offset + * accordingly. Note that there is no indication in the skbuff that the + * %CHECKSUM_PARTIAL refers to an FCOE checksum, so a driver that supports + * both IP checksum offload and FCOE CRC offload must verify which offload + * is configured for a packet, presumably by inspecting packet headers. + * + * Checksumming on output with GSO + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * In the case of a GSO packet (skb_is_gso() is true), checksum offload + * is implied by the SKB_GSO_* flags in gso_type. Most obviously, if the + * gso_type is %SKB_GSO_TCPV4 or %SKB_GSO_TCPV6, TCP checksum offload as + * part of the GSO operation is implied. If a checksum is being offloaded + * with GSO then ip_summed is %CHECKSUM_PARTIAL, and both csum_start and + * csum_offset are set to refer to the outermost checksum being offloaded + * (two offloaded checksums are possible with UDP encapsulation). + */ /* Don't change this without changing skb_csum_unnecessary! */ -#define CHECKSUM_NONE 0 -#define CHECKSUM_UNNECESSARY 1 -#define CHECKSUM_COMPLETE 2 -#define CHECKSUM_PARTIAL 3 +#define CHECKSUM_NONE 0 +#define CHECKSUM_UNNECESSARY 1 +#define CHECKSUM_COMPLETE 2 +#define CHECKSUM_PARTIAL 3 -#define SKB_DATA_ALIGN(X) (((X) + (SMP_CACHE_BYTES - 1)) & \ - ~(SMP_CACHE_BYTES - 1)) +/* Maximum value in skb->csum_level */ +#define SKB_MAX_CSUM_LEVEL 3 + +#define SKB_DATA_ALIGN(X) ALIGN(X, SMP_CACHE_BYTES) #define SKB_WITH_OVERHEAD(X) \ ((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) + +/* For X bytes available in skb->head, what is the minimal + * allocation needed, knowing struct skb_shared_info needs + * to be aligned. + */ +#define SKB_HEAD_ALIGN(X) (SKB_DATA_ALIGN(X) + \ + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) + #define SKB_MAX_ORDER(X, ORDER) \ SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X)) #define SKB_MAX_HEAD(X) (SKB_MAX_ORDER((X), 0)) @@ -54,82 +274,72 @@ SKB_DATA_ALIGN(sizeof(struct sk_buff)) + \ SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) -/* A. Checksumming of received packets by device. - * - * NONE: device failed to checksum this packet. - * skb->csum is undefined. - * - * UNNECESSARY: device parsed packet and wouldbe verified checksum. - * skb->csum is undefined. - * It is bad option, but, unfortunately, many of vendors do this. - * Apparently with secret goal to sell you new device, when you - * will add new protocol to your host. F.e. IPv6. 8) - * - * COMPLETE: the most generic way. Device supplied checksum of _all_ - * the packet as seen by netif_rx in skb->csum. - * NOTE: Even if device supports only some protocols, but - * is able to produce some skb->csum, it MUST use COMPLETE, - * not UNNECESSARY. - * - * PARTIAL: identical to the case for output below. This may occur - * on a packet received directly from another Linux OS, e.g., - * a virtualised Linux kernel on the same host. The packet can - * be treated in the same way as UNNECESSARY except that on - * output (i.e., forwarding) the checksum must be filled in - * by the OS or the hardware. - * - * B. Checksumming on output. - * - * NONE: skb is checksummed by protocol or csum is not required. - * - * PARTIAL: device is required to csum packet as seen by hard_start_xmit - * from skb->csum_start to the end and to record the checksum - * at skb->csum_start + skb->csum_offset. - * - * Device must show its capabilities in dev->features, set - * at device setup time. - * NETIF_F_HW_CSUM - it is clever device, it is able to checksum - * everything. - * NETIF_F_IP_CSUM - device is dumb. It is able to csum only - * TCP/UDP over IPv4. Sigh. Vendors like this - * way by an unknown reason. Though, see comment above - * about CHECKSUM_UNNECESSARY. 8) - * NETIF_F_IPV6_CSUM about as dumb as the last one but does IPv6 instead. - * - * UNNECESSARY: device will do per protocol specific csum. Protocol drivers - * that do not want net to perform the checksum calculation should use - * this flag in their outgoing skbs. - * NETIF_F_FCOE_CRC this indicates the device can do FCoE FC CRC - * offload. Correspondingly, the FCoE protocol driver - * stack should use CHECKSUM_UNNECESSARY. - * - * Any questions? No questions, good. --ANK - */ - struct net_device; struct scatterlist; struct pipe_inode_info; - -#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) -struct nf_conntrack { - atomic_t use; +struct iov_iter; +struct napi_struct; +struct bpf_prog; +union bpf_attr; +struct skb_ext; +struct ts_config; + +#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) +struct nf_bridge_info { + enum { + BRNF_PROTO_UNCHANGED, + BRNF_PROTO_8021Q, + BRNF_PROTO_PPPOE + } orig_proto:8; + u8 pkt_otherhost:1; + u8 in_prerouting:1; + u8 bridged_dnat:1; + u8 sabotage_in_done:1; + __u16 frag_max_size; + int physinif; + + /* always valid & non-NULL from FORWARD on, for physdev match */ + struct net_device *physoutdev; + union { + /* prerouting: detect dnat in orig/reply direction */ + __be32 ipv4_daddr; + struct in6_addr ipv6_daddr; + + /* after prerouting + nat detected: store original source + * mac since neigh resolution overwrites it, only used while + * skb is out in neigh layer. + */ + char neigh_header[8]; + }; }; #endif -#ifdef CONFIG_BRIDGE_NETFILTER -struct nf_bridge_info { - atomic_t use; - unsigned int mask; - struct net_device *physindev; - struct net_device *physoutdev; - unsigned long data[32 / sizeof(unsigned long)]; +#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT) +/* Chain in tc_skb_ext will be used to share the tc chain with + * ovs recirc_id. It will be set to the current chain by tc + * and read by ovs to recirc_id. + */ +struct tc_skb_ext { + union { + u64 act_miss_cookie; + __u32 chain; + }; + __u16 mru; + __u16 zone; + u8 post_ct:1; + u8 post_ct_snat:1; + u8 post_ct_dnat:1; + u8 act_miss:1; /* Set if act_miss_cookie is used */ + u8 l2_miss:1; /* Set by bridge upon FDB or MDB miss */ }; #endif struct sk_buff_head { - /* These two members must be first. */ - struct sk_buff *next; - struct sk_buff *prev; + /* These two members must be first to match sk_buff. */ + struct_group_tagged(sk_buff_list, list, + struct sk_buff *next; + struct sk_buff *prev; + ); __u32 qlen; spinlock_t lock; @@ -137,72 +347,111 @@ struct sk_buff_head { struct sk_buff; -/* To allow 64K frame to be packed as single skb without frag_list we - * require 64K/PAGE_SIZE pages plus 1 additional page to allow for - * buffers which do not start on a page boundary. - * - * Since GRO uses frags we allocate at least 16 regardless of page - * size. - */ -#if (65536/PAGE_SIZE + 1) < 16 -#define MAX_SKB_FRAGS 16UL -#else -#define MAX_SKB_FRAGS (65536/PAGE_SIZE + 1) +#ifndef CONFIG_MAX_SKB_FRAGS +# define CONFIG_MAX_SKB_FRAGS 17 #endif -typedef struct skb_frag_struct skb_frag_t; +#define MAX_SKB_FRAGS CONFIG_MAX_SKB_FRAGS -struct skb_frag_struct { - struct { - struct page *p; - } page; -#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) - __u32 page_offset; - __u32 size; -#else - __u16 page_offset; - __u16 size; -#endif -}; +/* Set skb_shinfo(skb)->gso_size to this in case you want skb_segment to + * segment using its current segmentation instead. + */ +#define GSO_BY_FRAGS 0xFFFF + +typedef struct skb_frag { + netmem_ref netmem; + unsigned int len; + unsigned int offset; +} skb_frag_t; +/** + * skb_frag_size() - Returns the size of a skb fragment + * @frag: skb fragment + */ static inline unsigned int skb_frag_size(const skb_frag_t *frag) { - return frag->size; + return frag->len; } +/** + * skb_frag_size_set() - Sets the size of a skb fragment + * @frag: skb fragment + * @size: size of fragment + */ static inline void skb_frag_size_set(skb_frag_t *frag, unsigned int size) { - frag->size = size; + frag->len = size; } +/** + * skb_frag_size_add() - Increments the size of a skb fragment by @delta + * @frag: skb fragment + * @delta: value to add + */ static inline void skb_frag_size_add(skb_frag_t *frag, int delta) { - frag->size += delta; + frag->len += delta; } +/** + * skb_frag_size_sub() - Decrements the size of a skb fragment by @delta + * @frag: skb fragment + * @delta: value to subtract + */ static inline void skb_frag_size_sub(skb_frag_t *frag, int delta) { - frag->size -= delta; + frag->len -= delta; } -#define HAVE_HW_TIME_STAMP +/** + * skb_frag_must_loop - Test if %p is a high memory page + * @p: fragment's page + */ +static inline bool skb_frag_must_loop(struct page *p) +{ +#if defined(CONFIG_HIGHMEM) + if (IS_ENABLED(CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP) || PageHighMem(p)) + return true; +#endif + return false; +} + +/** + * skb_frag_foreach_page - loop over pages in a fragment + * + * @f: skb frag to operate on + * @f_off: offset from start of f->netmem + * @f_len: length from f_off to loop over + * @p: (temp var) current page + * @p_off: (temp var) offset from start of current page, + * non-zero only on first page. + * @p_len: (temp var) length in current page, + * < PAGE_SIZE only on first and last page. + * @copied: (temp var) length so far, excluding current p_len. + * + * A fragment can hold a compound page, in which case per-page + * operations, notably kmap_atomic, must be called for each + * regular page. + */ +#define skb_frag_foreach_page(f, f_off, f_len, p, p_off, p_len, copied) \ + for (p = skb_frag_page(f) + ((f_off) >> PAGE_SHIFT), \ + p_off = (f_off) & (PAGE_SIZE - 1), \ + p_len = skb_frag_must_loop(p) ? \ + min_t(u32, f_len, PAGE_SIZE - p_off) : f_len, \ + copied = 0; \ + copied < f_len; \ + copied += p_len, p++, p_off = 0, \ + p_len = min_t(u32, f_len - copied, PAGE_SIZE)) \ /** * struct skb_shared_hwtstamps - hardware time stamps - * @hwtstamp: hardware time stamp transformed into duration - * since arbitrary point in time - * @syststamp: hwtstamp transformed to system time base + * @hwtstamp: hardware time stamp transformed into duration + * since arbitrary point in time + * @netdev_data: address/cookie of network device driver used as + * reference to actual hardware time stamp * * Software time stamps generated by ktime_get_real() are stored in - * skb->tstamp. The relation between the different kinds of time - * stamps is as follows: - * - * syststamp and tstamp can be compared against each other in - * arbitrary combinations. The accuracy of a - * syststamp/tstamp/"syststamp from other device" comparison is - * limited by the accuracy of the transformation into system time - * base. This depends on the device driver and its underlying - * hardware. + * skb->tstamp. * * hwtstamps can only be compared against other hwtstamps from * the same device. @@ -211,33 +460,79 @@ static inline void skb_frag_size_sub(skb_frag_t *frag, int delta) * &skb_shared_info. Use skb_hwtstamps() to get a pointer. */ struct skb_shared_hwtstamps { - ktime_t hwtstamp; - ktime_t syststamp; + union { + ktime_t hwtstamp; + void *netdev_data; + }; }; /* Definitions for tx_flags in struct skb_shared_info */ enum { /* generate hardware time stamp */ - SKBTX_HW_TSTAMP = 1 << 0, + SKBTX_HW_TSTAMP_NOBPF = 1 << 0, - /* generate software time stamp */ + /* generate software time stamp when queueing packet to NIC */ SKBTX_SW_TSTAMP = 1 << 1, /* device driver is going to provide hardware time stamp */ SKBTX_IN_PROGRESS = 1 << 2, - /* device driver supports TX zero-copy buffers */ - SKBTX_DEV_ZEROCOPY = 1 << 3, + /* generate software time stamp on packet tx completion */ + SKBTX_COMPLETION_TSTAMP = 1 << 3, + + /* determine hardware time stamp based on time or cycles */ + SKBTX_HW_TSTAMP_NETDEV = 1 << 5, + + /* generate software time stamp when entering packet scheduling */ + SKBTX_SCHED_TSTAMP = 1 << 6, + + /* used for bpf extension when a bpf program is loaded */ + SKBTX_BPF = 1 << 7, +}; + +#define SKBTX_HW_TSTAMP (SKBTX_HW_TSTAMP_NOBPF | SKBTX_BPF) - /* generate wifi status information (where possible) */ - SKBTX_WIFI_STATUS = 1 << 4, +#define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | \ + SKBTX_SCHED_TSTAMP | \ + SKBTX_BPF | \ + SKBTX_COMPLETION_TSTAMP) +#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | \ + SKBTX_ANY_SW_TSTAMP) + +/* Definitions for flags in struct skb_shared_info */ +enum { + /* use zcopy routines */ + SKBFL_ZEROCOPY_ENABLE = BIT(0), /* This indicates at least one fragment might be overwritten * (as in vmsplice(), sendfile() ...) * If we need to compute a TX checksum, we'll need to copy * all frags to avoid possible bad checksum */ - SKBTX_SHARED_FRAG = 1 << 5, + SKBFL_SHARED_FRAG = BIT(1), + + /* segment contains only zerocopy data and should not be + * charged to the kernel memory. + */ + SKBFL_PURE_ZEROCOPY = BIT(2), + + SKBFL_DONT_ORPHAN = BIT(3), + + /* page references are managed by the ubuf_info, so it's safe to + * use frags only up until ubuf_info is released + */ + SKBFL_MANAGED_FRAG_REFS = BIT(4), +}; + +#define SKBFL_ZEROCOPY_FRAG (SKBFL_ZEROCOPY_ENABLE | SKBFL_SHARED_FRAG) +#define SKBFL_ALL_ZEROCOPY (SKBFL_ZEROCOPY_FRAG | SKBFL_PURE_ZEROCOPY | \ + SKBFL_DONT_ORPHAN | SKBFL_MANAGED_FRAG_REFS) + +struct ubuf_info_ops { + void (*complete)(struct sk_buff *, struct ubuf_info *, + bool zerocopy_success); + /* has to be compatible with skb_zcopy_set() */ + int (*link_skb)(struct sk_buff *skb, struct ubuf_info *uarg); }; /* @@ -249,68 +544,137 @@ enum { * The desc field is used to track userspace buffer index. */ struct ubuf_info { - void (*callback)(struct ubuf_info *, bool zerocopy_success); - void *ctx; - unsigned long desc; + const struct ubuf_info_ops *ops; + refcount_t refcnt; + u8 flags; +}; + +struct ubuf_info_msgzc { + struct ubuf_info ubuf; + + union { + struct { + unsigned long desc; + void *ctx; + }; + struct { + u32 id; + u16 len; + u16 zerocopy:1; + u32 bytelen; + }; + }; + + struct mmpin { + struct user_struct *user; + unsigned int num_pg; + } mmp; +}; + +#define skb_uarg(SKB) ((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg)) +#define uarg_to_msgzc(ubuf_ptr) container_of((ubuf_ptr), struct ubuf_info_msgzc, \ + ubuf) + +int mm_account_pinned_pages(struct mmpin *mmp, size_t size); +void mm_unaccount_pinned_pages(struct mmpin *mmp); + +/* Preserve some data across TX submission and completion. + * + * Note, this state is stored in the driver. Extending the layout + * might need some special care. + */ +struct xsk_tx_metadata_compl { + __u64 *tx_timestamp; }; /* This data is invariant across clones and lives at * the end of the header data, ie. at skb->end. */ struct skb_shared_info { - unsigned char nr_frags; + __u8 flags; + __u8 meta_len; + __u8 nr_frags; __u8 tx_flags; unsigned short gso_size; /* Warning: this field is not always filled in (UFO)! */ unsigned short gso_segs; - unsigned short gso_type; struct sk_buff *frag_list; - struct skb_shared_hwtstamps hwtstamps; - __be32 ip6_frag_id; + union { + struct skb_shared_hwtstamps hwtstamps; + struct xsk_tx_metadata_compl xsk_meta; + }; + unsigned int gso_type; + u32 tskey; /* * Warning : all fields before dataref are cleared in __alloc_skb() */ atomic_t dataref; - /* Intermediate layers must ensure that destructor_arg - * remains valid until skb destructor */ - void * destructor_arg; + union { + struct { + u32 xdp_frags_size; + u32 xdp_frags_truesize; + }; + + /* + * Intermediate layers must ensure that destructor_arg + * remains valid until skb destructor. + */ + void *destructor_arg; + }; /* must be last field, see pskb_expand_head() */ skb_frag_t frags[MAX_SKB_FRAGS]; }; -/* We divide dataref into two halves. The higher 16 bits hold references - * to the payload part of skb->data. The lower 16 bits hold references to - * the entire skb->data. A clone of a headerless skb holds the length of - * the header in skb->hdr_len. +/** + * DOC: dataref and headerless skbs + * + * Transport layers send out clones of payload skbs they hold for + * retransmissions. To allow lower layers of the stack to prepend their headers + * we split &skb_shared_info.dataref into two halves. + * The lower 16 bits count the overall number of references. + * The higher 16 bits indicate how many of the references are payload-only. + * skb_header_cloned() checks if skb is allowed to add / write the headers. + * + * The creator of the skb (e.g. TCP) marks its skb as &sk_buff.nohdr + * (via __skb_header_release()). Any clone created from marked skb will get + * &sk_buff.hdr_len populated with the available headroom. + * If there's the only clone in existence it's able to modify the headroom + * at will. The sequence of calls inside the transport layer is:: * - * All users must obey the rule that the skb->data reference count must be - * greater than or equal to the payload reference count. + * <alloc skb> + * skb_reserve() + * __skb_header_release() + * skb_clone() + * // send the clone down the stack * - * Holding a reference to the payload part means that the user does not - * care about modifications to the header part of skb->data. + * This is not a very generic construct and it depends on the transport layers + * doing the right thing. In practice there's usually only one payload-only skb. + * Having multiple payload-only skbs with different lengths of hdr_len is not + * possible. The payload-only skbs should never leave their owner. */ #define SKB_DATAREF_SHIFT 16 #define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1) enum { - SKB_FCLONE_UNAVAILABLE, - SKB_FCLONE_ORIG, - SKB_FCLONE_CLONE, + SKB_FCLONE_UNAVAILABLE, /* skb has no fclone (from head_cache) */ + SKB_FCLONE_ORIG, /* orig skb (from fclone_cache) */ + SKB_FCLONE_CLONE, /* companion fclone skb (from fclone_cache) */ }; enum { SKB_GSO_TCPV4 = 1 << 0, - SKB_GSO_UDP = 1 << 1, /* This indicates the skb is from an untrusted source. */ - SKB_GSO_DODGY = 1 << 2, + SKB_GSO_DODGY = 1 << 1, /* This indicates the tcp segment has CWR set. */ - SKB_GSO_TCP_ECN = 1 << 3, + SKB_GSO_TCP_ECN = 1 << 2, + + __SKB_GSO_TCP_FIXEDID = 1 << 3, SKB_GSO_TCPV6 = 1 << 4, @@ -318,9 +682,37 @@ enum { SKB_GSO_GRE = 1 << 6, - SKB_GSO_UDP_TUNNEL = 1 << 7, + SKB_GSO_GRE_CSUM = 1 << 7, + + SKB_GSO_IPXIP4 = 1 << 8, + + SKB_GSO_IPXIP6 = 1 << 9, + + SKB_GSO_UDP_TUNNEL = 1 << 10, + + SKB_GSO_UDP_TUNNEL_CSUM = 1 << 11, + + SKB_GSO_PARTIAL = 1 << 12, + + SKB_GSO_TUNNEL_REMCSUM = 1 << 13, - SKB_GSO_MPLS = 1 << 8, + SKB_GSO_SCTP = 1 << 14, + + SKB_GSO_ESP = 1 << 15, + + SKB_GSO_UDP = 1 << 16, + + SKB_GSO_UDP_L4 = 1 << 17, + + SKB_GSO_FRAGLIST = 1 << 18, + + SKB_GSO_TCP_ACCECN = 1 << 19, + + /* These indirectly map onto the same netdev feature. + * If NETIF_F_TSO_MANGLEID is set it may mangle both inner and outer IDs. + */ + SKB_GSO_TCP_FIXEDID = 1 << 30, + SKB_GSO_TCP_FIXEDID_INNER = 1 << 31, }; #if BITS_PER_LONG > 32 @@ -333,21 +725,68 @@ typedef unsigned int sk_buff_data_t; typedef unsigned char *sk_buff_data_t; #endif -#if defined(CONFIG_NF_DEFRAG_IPV4) || defined(CONFIG_NF_DEFRAG_IPV4_MODULE) || \ - defined(CONFIG_NF_DEFRAG_IPV6) || defined(CONFIG_NF_DEFRAG_IPV6_MODULE) -#define NET_SKBUFF_NF_DEFRAG_NEEDED 1 -#endif +enum skb_tstamp_type { + SKB_CLOCK_REALTIME, + SKB_CLOCK_MONOTONIC, + SKB_CLOCK_TAI, + __SKB_CLOCK_MAX = SKB_CLOCK_TAI, +}; -/** +/** + * DOC: Basic sk_buff geometry + * + * struct sk_buff itself is a metadata structure and does not hold any packet + * data. All the data is held in associated buffers. + * + * &sk_buff.head points to the main "head" buffer. The head buffer is divided + * into two parts: + * + * - data buffer, containing headers and sometimes payload; + * this is the part of the skb operated on by the common helpers + * such as skb_put() or skb_pull(); + * - shared info (struct skb_shared_info) which holds an array of pointers + * to read-only data in the (page, offset, length) format. + * + * Optionally &skb_shared_info.frag_list may point to another skb. + * + * Basic diagram may look like this:: + * + * --------------- + * | sk_buff | + * --------------- + * ,--------------------------- + head + * / ,----------------- + data + * / / ,----------- + tail + * | | | , + end + * | | | | + * v v v v + * ----------------------------------------------- + * | headroom | data | tailroom | skb_shared_info | + * ----------------------------------------------- + * + [page frag] + * + [page frag] + * + [page frag] + * + [page frag] --------- + * + frag_list --> | sk_buff | + * --------- + * + */ + +/** * struct sk_buff - socket buffer * @next: Next buffer in list * @prev: Previous buffer in list - * @tstamp: Time we arrived + * @tstamp: Time we arrived/left + * @skb_mstamp_ns: (aka @tstamp) earliest departure time; start point + * for retransmit timer + * @rbnode: RB tree node, alternative to next/prev for netem/tcp + * @list: queue head + * @ll_node: anchor in an llist (eg socket defer_list) * @sk: Socket we are owned by * @dev: Device we arrived on/are leaving by + * @dev_scratch: (aka @dev) alternate use of @dev when @dev would be %NULL * @cb: Control buffer. Free for use by every layer. Put private vars here * @_skb_refdst: destination entry (with norefcount bit) - * @sp: the security path, used for xfrm * @len: Length of actual data * @data_len: Data length * @mac_len: Length of link layer header @@ -356,67 +795,120 @@ typedef unsigned char *sk_buff_data_t; * @csum_start: Offset from skb->head where checksumming should start * @csum_offset: Offset from csum_start where checksum should be stored * @priority: Packet queueing priority - * @local_df: allow local fragmentation + * @ignore_df: allow local fragmentation * @cloned: Head may be cloned (check refcnt to be sure) * @ip_summed: Driver fed us an IP checksum * @nohdr: Payload reference only, must not modify header - * @nfctinfo: Relationship of this skb to the connection * @pkt_type: Packet class * @fclone: skbuff clone status * @ipvs_property: skbuff is owned by ipvs + * @inner_protocol_type: whether the inner protocol is + * ENCAP_TYPE_ETHER or ENCAP_TYPE_IPPROTO + * @remcsum_offload: remote checksum offload is enabled + * @offload_fwd_mark: Packet was L2-forwarded in hardware + * @offload_l3_fwd_mark: Packet was L3-forwarded in hardware + * @tc_skip_classify: do not classify packet. set by IFB device + * @tc_at_ingress: used within tc_classify to distinguish in/egress + * @redirected: packet was redirected by packet classifier + * @from_ingress: packet was redirected from the ingress path + * @nf_skip_egress: packet shall skip nf egress - see netfilter_netdev.h * @peeked: this packet has been seen already, so stats have been * done for it, don't do them again * @nf_trace: netfilter packet trace flag * @protocol: Packet protocol from driver * @destructor: Destruct function - * @nfct: Associated connection, if any - * @nfct_reasm: netfilter conntrack re-assembly pointer - * @nf_bridge: Saved data about a bridged frame - see br_netfilter.c + * @tcp_tsorted_anchor: list structure for TCP (tp->tsorted_sent_queue) + * @_sk_redir: socket redirection information for skmsg + * @_nfct: Associated connection, if any (with nfctinfo bits) * @skb_iif: ifindex of device we arrived on * @tc_index: Traffic control index - * @tc_verd: traffic control verdict - * @rxhash: the packet hash computed on receive + * @hash: the packet hash * @queue_mapping: Queue mapping for multiqueue devices + * @head_frag: skb was allocated from page fragments, + * not allocated by kmalloc() or vmalloc(). + * @pfmemalloc: skbuff was allocated from PFMEMALLOC reserves + * @pp_recycle: mark the packet for recycling instead of freeing (implies + * page_pool support on driver) + * @active_extensions: active extensions (skb_ext_id types) * @ndisc_nodetype: router type (from link layer) * @ooo_okay: allow the mapping of a socket to a queue to be changed - * @l4_rxhash: indicate rxhash is a canonical 4-tuple hash over transport + * @l4_hash: indicate hash is a canonical 4-tuple hash over transport * ports. + * @sw_hash: indicates hash was computed in software stack * @wifi_acked_valid: wifi_acked was set * @wifi_acked: whether frame was acked on wifi or not * @no_fcs: Request NIC to treat last 4 bytes as Ethernet FCS - * @dma_cookie: a cookie to one of several possible DMA operations - * done by skb DMA functions - * @napi_id: id of the NAPI struct this skb came from + * @encapsulation: indicates the inner headers in the skbuff are valid + * @encap_hdr_csum: software checksum is needed + * @csum_valid: checksum is already valid + * @csum_not_inet: use CRC32c to resolve CHECKSUM_PARTIAL + * @csum_complete_sw: checksum was completed by software + * @csum_level: indicates the number of consecutive checksums found in + * the packet minus one that have been verified as + * CHECKSUM_UNNECESSARY (max 3) + * @unreadable: indicates that at least 1 of the fragments in this skb is + * unreadable. + * @dst_pending_confirm: need to confirm neighbour + * @decrypted: Decrypted SKB + * @slow_gro: state present at GRO time, slower prepare step required + * @tstamp_type: When set, skb->tstamp has the + * delivery_time clock base of skb->tstamp. + * @napi_id: id of the NAPI struct this skb came from + * @sender_cpu: (aka @napi_id) source CPU in XPS + * @alloc_cpu: CPU which did the skb allocation. * @secmark: security marking * @mark: Generic packet mark - * @dropcount: total number of sk_receive_queue overflows + * @reserved_tailroom: (aka @mark) number of bytes of free space available + * at the tail of an sk_buff + * @vlan_all: vlan fields (proto & tci) * @vlan_proto: vlan encapsulation protocol * @vlan_tci: vlan tag control information * @inner_protocol: Protocol (encapsulation) + * @inner_ipproto: (aka @inner_protocol) stores ipproto when + * skb->inner_protocol_type == ENCAP_TYPE_IPPROTO; * @inner_transport_header: Inner transport layer header (encapsulation) * @inner_network_header: Network layer header (encapsulation) * @inner_mac_header: Link layer header (encapsulation) * @transport_header: Transport layer header * @network_header: Network layer header * @mac_header: Link layer header + * @kcov_handle: KCOV remote handle for remote coverage collection * @tail: Tail pointer * @end: End pointer * @head: Head of buffer * @data: Data head pointer * @truesize: Buffer size * @users: User count - see {datagram,tcp}.c + * @extensions: allocated extensions, valid if active_extensions is nonzero */ struct sk_buff { - /* These two members must be first. */ - struct sk_buff *next; - struct sk_buff *prev; - - ktime_t tstamp; + union { + struct { + /* These two members must be first to match sk_buff_head. */ + struct sk_buff *next; + struct sk_buff *prev; + + union { + struct net_device *dev; + /* Some protocols might use this space to store information, + * while device pointer would be NULL. + * UDP receive path is one user. + */ + unsigned long dev_scratch; + }; + }; + struct rb_node rbnode; /* used in netem, ip4 defrag, and tcp stack */ + struct list_head list; + struct llist_node ll_node; + }; struct sock *sk; - struct net_device *dev; + union { + ktime_t tstamp; + u64 skb_mstamp_ns; /* earliest departure time */ + }; /* * This is the control buffer. It is free to use for every * layer. Please put your private variables there. If you @@ -425,124 +917,225 @@ struct sk_buff { */ char cb[48] __aligned(8); - unsigned long _skb_refdst; -#ifdef CONFIG_XFRM - struct sec_path *sp; -#endif - unsigned int len, - data_len; - __u16 mac_len, - hdr_len; union { - __wsum csum; struct { - __u16 csum_start; - __u16 csum_offset; + unsigned long _skb_refdst; + void (*destructor)(struct sk_buff *skb); }; + struct list_head tcp_tsorted_anchor; +#ifdef CONFIG_NET_SOCK_MSG + unsigned long _sk_redir; +#endif }; - __u32 priority; - kmemcheck_bitfield_begin(flags1); - __u8 local_df:1, - cloned:1, - ip_summed:2, - nohdr:1, - nfctinfo:3; - __u8 pkt_type:3, - fclone:2, - ipvs_property:1, - peeked:1, - nf_trace:1; - kmemcheck_bitfield_end(flags1); - __be16 protocol; - void (*destructor)(struct sk_buff *skb); #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) - struct nf_conntrack *nfct; -#endif -#ifdef NET_SKBUFF_NF_DEFRAG_NEEDED - struct sk_buff *nfct_reasm; + unsigned long _nfct; #endif -#ifdef CONFIG_BRIDGE_NETFILTER - struct nf_bridge_info *nf_bridge; -#endif - - int skb_iif; - - __u32 rxhash; + unsigned int len, + data_len; + __u16 mac_len, + hdr_len; - __be16 vlan_proto; - __u16 vlan_tci; + /* Following fields are _not_ copied in __copy_skb_header() + * Note that queue_mapping is here mostly to fill a hole. + */ + __u16 queue_mapping; -#ifdef CONFIG_NET_SCHED - __u16 tc_index; /* traffic control index */ -#ifdef CONFIG_NET_CLS_ACT - __u16 tc_verd; /* traffic control verdict */ -#endif +/* if you move cloned around you also must adapt those constants */ +#ifdef __BIG_ENDIAN_BITFIELD +#define CLONED_MASK (1 << 7) +#else +#define CLONED_MASK 1 #endif +#define CLONED_OFFSET offsetof(struct sk_buff, __cloned_offset) - __u16 queue_mapping; - kmemcheck_bitfield_begin(flags2); -#ifdef CONFIG_IPV6_NDISC_NODETYPE - __u8 ndisc_nodetype:2; + /* private: */ + __u8 __cloned_offset[0]; + /* public: */ + __u8 cloned:1, + nohdr:1, + fclone:2, + peeked:1, + head_frag:1, + pfmemalloc:1, + pp_recycle:1; /* page_pool recycle indicator */ +#ifdef CONFIG_SKB_EXTENSIONS + __u8 active_extensions; #endif - __u8 pfmemalloc:1; + + /* Fields enclosed in headers group are copied + * using a single memcpy() in __copy_skb_header() + */ + struct_group(headers, + + /* private: */ + __u8 __pkt_type_offset[0]; + /* public: */ + __u8 pkt_type:3; /* see PKT_TYPE_MAX */ + __u8 ignore_df:1; + __u8 dst_pending_confirm:1; + __u8 ip_summed:2; __u8 ooo_okay:1; - __u8 l4_rxhash:1; + + /* private: */ + __u8 __mono_tc_offset[0]; + /* public: */ + __u8 tstamp_type:2; /* See skb_tstamp_type */ +#ifdef CONFIG_NET_XGRESS + __u8 tc_at_ingress:1; /* See TC_AT_INGRESS_MASK */ + __u8 tc_skip_classify:1; +#endif + __u8 remcsum_offload:1; + __u8 csum_complete_sw:1; + __u8 csum_level:2; + __u8 inner_protocol_type:1; + + __u8 l4_hash:1; + __u8 sw_hash:1; +#ifdef CONFIG_WIRELESS __u8 wifi_acked_valid:1; __u8 wifi_acked:1; +#endif __u8 no_fcs:1; - __u8 head_frag:1; - /* Encapsulation protocol and NIC drivers should use - * this flag to indicate to each other if the skb contains - * encapsulated packet or not and maybe use the inner packet - * headers if needed - */ + /* Indicates the inner headers are valid in the skbuff. */ __u8 encapsulation:1; - /* 7/9 bit hole (depending on ndisc_nodetype presence) */ - kmemcheck_bitfield_end(flags2); + __u8 encap_hdr_csum:1; + __u8 csum_valid:1; +#ifdef CONFIG_IPV6_NDISC_NODETYPE + __u8 ndisc_nodetype:2; +#endif + +#if IS_ENABLED(CONFIG_IP_VS) + __u8 ipvs_property:1; +#endif +#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) || IS_ENABLED(CONFIG_NF_TABLES) + __u8 nf_trace:1; +#endif +#ifdef CONFIG_NET_SWITCHDEV + __u8 offload_fwd_mark:1; + __u8 offload_l3_fwd_mark:1; +#endif + __u8 redirected:1; +#ifdef CONFIG_NET_REDIRECT + __u8 from_ingress:1; +#endif +#ifdef CONFIG_NETFILTER_SKIP_EGRESS + __u8 nf_skip_egress:1; +#endif +#ifdef CONFIG_SKB_DECRYPTED + __u8 decrypted:1; +#endif + __u8 slow_gro:1; +#if IS_ENABLED(CONFIG_IP_SCTP) + __u8 csum_not_inet:1; +#endif + __u8 unreadable:1; +#if defined(CONFIG_NET_SCHED) || defined(CONFIG_NET_XGRESS) + __u16 tc_index; /* traffic control index */ +#endif + + u16 alloc_cpu; -#if defined CONFIG_NET_DMA || defined CONFIG_NET_LL_RX_POLL + union { + __wsum csum; + struct { + __u16 csum_start; + __u16 csum_offset; + }; + }; + __u32 priority; + int skb_iif; + __u32 hash; + union { + u32 vlan_all; + struct { + __be16 vlan_proto; + __u16 vlan_tci; + }; + }; +#if defined(CONFIG_NET_RX_BUSY_POLL) || defined(CONFIG_XPS) union { unsigned int napi_id; - dma_cookie_t dma_cookie; + unsigned int sender_cpu; }; #endif #ifdef CONFIG_NETWORK_SECMARK - __u32 secmark; + __u32 secmark; #endif + union { __u32 mark; - __u32 dropcount; __u32 reserved_tailroom; }; - __be16 inner_protocol; + union { + __be16 inner_protocol; + __u8 inner_ipproto; + }; + __u16 inner_transport_header; __u16 inner_network_header; __u16 inner_mac_header; + + __be16 protocol; __u16 transport_header; __u16 network_header; __u16 mac_header; + +#ifdef CONFIG_KCOV + u64 kcov_handle; +#endif + + ); /* end headers group */ + /* These elements must be at the end, see alloc_skb() for details. */ sk_buff_data_t tail; sk_buff_data_t end; unsigned char *head, *data; unsigned int truesize; - atomic_t users; + refcount_t users; + +#ifdef CONFIG_SKB_EXTENSIONS + /* only usable after checking ->active_extensions != 0 */ + struct skb_ext *extensions; +#endif }; +/* if you move pkt_type around you also must adapt those constants */ +#ifdef __BIG_ENDIAN_BITFIELD +#define PKT_TYPE_MAX (7 << 5) +#else +#define PKT_TYPE_MAX 7 +#endif +#define PKT_TYPE_OFFSET offsetof(struct sk_buff, __pkt_type_offset) + +/* if you move tc_at_ingress or tstamp_type + * around, you also must adapt these constants. + */ +#ifdef __BIG_ENDIAN_BITFIELD +#define SKB_TSTAMP_TYPE_MASK (3 << 6) +#define SKB_TSTAMP_TYPE_RSHIFT (6) +#define TC_AT_INGRESS_MASK (1 << 5) +#else +#define SKB_TSTAMP_TYPE_MASK (3) +#define TC_AT_INGRESS_MASK (1 << 2) +#endif +#define SKB_BF_MONO_TC_OFFSET offsetof(struct sk_buff, __mono_tc_offset) + #ifdef __KERNEL__ /* * Handling routines are only of interest to the kernel */ -#include <linux/slab.h> - #define SKB_ALLOC_FCLONE 0x01 #define SKB_ALLOC_RX 0x02 +#define SKB_ALLOC_NAPI 0x04 -/* Returns true if the skb was allocated from PFMEMALLOC reserves */ +/** + * skb_pfmemalloc - Test if the skb was allocated from PFMEMALLOC reserves + * @skb: buffer + */ static inline bool skb_pfmemalloc(const struct sk_buff *skb) { return unlikely(skb->pfmemalloc); @@ -559,11 +1152,11 @@ static inline bool skb_pfmemalloc(const struct sk_buff *skb) * skb_dst - returns skb dst_entry * @skb: buffer * - * Returns skb dst_entry, regardless of reference taken or not. + * Returns: skb dst_entry, regardless of reference taken or not. */ static inline struct dst_entry *skb_dst(const struct sk_buff *skb) { - /* If refdst was not refcounted, check we still are in a + /* If refdst was not refcounted, check we still are in a * rcu_read_lock section */ WARN_ON((skb->_skb_refdst & SKB_DST_NOREF) && @@ -572,6 +1165,45 @@ static inline struct dst_entry *skb_dst(const struct sk_buff *skb) return (struct dst_entry *)(skb->_skb_refdst & SKB_DST_PTRMASK); } +static inline void skb_dst_check_unset(struct sk_buff *skb) +{ + DEBUG_NET_WARN_ON_ONCE((skb->_skb_refdst & SKB_DST_PTRMASK) && + !(skb->_skb_refdst & SKB_DST_NOREF)); +} + +/** + * skb_dstref_steal() - return current dst_entry value and clear it + * @skb: buffer + * + * Resets skb dst_entry without adjusting its reference count. Useful in + * cases where dst_entry needs to be temporarily reset and restored. + * Note that the returned value cannot be used directly because it + * might contain SKB_DST_NOREF bit. + * + * When in doubt, prefer skb_dst_drop() over skb_dstref_steal() to correctly + * handle dst_entry reference counting. + * + * Returns: original skb dst_entry. + */ +static inline unsigned long skb_dstref_steal(struct sk_buff *skb) +{ + unsigned long refdst = skb->_skb_refdst; + + skb->_skb_refdst = 0; + return refdst; +} + +/** + * skb_dstref_restore() - restore skb dst_entry removed via skb_dstref_steal() + * @skb: buffer + * @refdst: dst entry from a call to skb_dstref_steal() + */ +static inline void skb_dstref_restore(struct sk_buff *skb, unsigned long refdst) +{ + skb_dst_check_unset(skb); + skb->_skb_refdst = refdst; +} + /** * skb_dst_set - sets skb dst * @skb: buffer @@ -582,12 +1214,11 @@ static inline struct dst_entry *skb_dst(const struct sk_buff *skb) */ static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst) { + skb_dst_check_unset(skb); + skb->slow_gro |= !!dst; skb->_skb_refdst = (unsigned long)dst; } -extern void __skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst, - bool force); - /** * skb_dst_set_noref - sets skb dst, hopefully, without taking reference * @skb: buffer @@ -600,101 +1231,254 @@ extern void __skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst, */ static inline void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst) { - __skb_dst_set_noref(skb, dst, false); + skb_dst_check_unset(skb); + WARN_ON(!rcu_read_lock_held() && !rcu_read_lock_bh_held()); + skb->slow_gro |= !!dst; + skb->_skb_refdst = (unsigned long)dst | SKB_DST_NOREF; } /** - * skb_dst_set_noref_force - sets skb dst, without taking reference + * skb_dst_is_noref - Test if skb dst isn't refcounted * @skb: buffer - * @dst: dst entry - * - * Sets skb dst, assuming a reference was not taken on dst. - * No reference is taken and no dst_release will be called. While for - * cached dsts deferred reclaim is a basic feature, for entries that are - * not cached it is caller's job to guarantee that last dst_release for - * provided dst happens when nobody uses it, eg. after a RCU grace period. */ -static inline void skb_dst_set_noref_force(struct sk_buff *skb, - struct dst_entry *dst) +static inline bool skb_dst_is_noref(const struct sk_buff *skb) +{ + return (skb->_skb_refdst & SKB_DST_NOREF) && skb_dst(skb); +} + +/* For mangling skb->pkt_type from user space side from applications + * such as nft, tc, etc, we only allow a conservative subset of + * possible pkt_types to be set. +*/ +static inline bool skb_pkt_type_ok(u32 ptype) { - __skb_dst_set_noref(skb, dst, true); + return ptype <= PACKET_OTHERHOST; } /** - * skb_dst_is_noref - Test if skb dst isn't refcounted + * skb_napi_id - Returns the skb's NAPI id * @skb: buffer */ -static inline bool skb_dst_is_noref(const struct sk_buff *skb) +static inline unsigned int skb_napi_id(const struct sk_buff *skb) { - return (skb->_skb_refdst & SKB_DST_NOREF) && skb_dst(skb); +#ifdef CONFIG_NET_RX_BUSY_POLL + return skb->napi_id; +#else + return 0; +#endif +} + +static inline bool skb_wifi_acked_valid(const struct sk_buff *skb) +{ +#ifdef CONFIG_WIRELESS + return skb->wifi_acked_valid; +#else + return 0; +#endif +} + +/** + * skb_unref - decrement the skb's reference count + * @skb: buffer + * + * Returns: true if we can free the skb. + */ +static inline bool skb_unref(struct sk_buff *skb) +{ + if (unlikely(!skb)) + return false; + if (!IS_ENABLED(CONFIG_DEBUG_NET) && likely(refcount_read(&skb->users) == 1)) + smp_rmb(); + else if (likely(!refcount_dec_and_test(&skb->users))) + return false; + + return true; +} + +static inline bool skb_data_unref(const struct sk_buff *skb, + struct skb_shared_info *shinfo) +{ + int bias; + + if (!skb->cloned) + return true; + + bias = skb->nohdr ? (1 << SKB_DATAREF_SHIFT) + 1 : 1; + + if (atomic_read(&shinfo->dataref) == bias) + smp_rmb(); + else if (atomic_sub_return(bias, &shinfo->dataref)) + return false; + + return true; } -static inline struct rtable *skb_rtable(const struct sk_buff *skb) +void __fix_address sk_skb_reason_drop(struct sock *sk, struct sk_buff *skb, + enum skb_drop_reason reason); + +static inline void +kfree_skb_reason(struct sk_buff *skb, enum skb_drop_reason reason) { - return (struct rtable *)skb_dst(skb); + sk_skb_reason_drop(NULL, skb, reason); } -extern void kfree_skb(struct sk_buff *skb); -extern void kfree_skb_list(struct sk_buff *segs); -extern void skb_tx_error(struct sk_buff *skb); -extern void consume_skb(struct sk_buff *skb); -extern void __kfree_skb(struct sk_buff *skb); -extern struct kmem_cache *skbuff_head_cache; +/** + * kfree_skb - free an sk_buff with 'NOT_SPECIFIED' reason + * @skb: buffer to free + */ +static inline void kfree_skb(struct sk_buff *skb) +{ + kfree_skb_reason(skb, SKB_DROP_REASON_NOT_SPECIFIED); +} + +void skb_release_head_state(struct sk_buff *skb); +void kfree_skb_list_reason(struct sk_buff *segs, + enum skb_drop_reason reason); +void skb_dump(const char *level, const struct sk_buff *skb, bool full_pkt); +void skb_tx_error(struct sk_buff *skb); + +static inline void kfree_skb_list(struct sk_buff *segs) +{ + kfree_skb_list_reason(segs, SKB_DROP_REASON_NOT_SPECIFIED); +} + +#ifdef CONFIG_TRACEPOINTS +void consume_skb(struct sk_buff *skb); +#else +static inline void consume_skb(struct sk_buff *skb) +{ + return kfree_skb(skb); +} +#endif + +void __consume_stateless_skb(struct sk_buff *skb); +void __kfree_skb(struct sk_buff *skb); -extern void kfree_skb_partial(struct sk_buff *skb, bool head_stolen); -extern bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from, - bool *fragstolen, int *delta_truesize); +void kfree_skb_partial(struct sk_buff *skb, bool head_stolen); +bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from, + bool *fragstolen, int *delta_truesize); -extern struct sk_buff *__alloc_skb(unsigned int size, - gfp_t priority, int flags, int node); -extern struct sk_buff *build_skb(void *data, unsigned int frag_size); +struct sk_buff *__alloc_skb(unsigned int size, gfp_t priority, int flags, + int node); +struct sk_buff *__build_skb(void *data, unsigned int frag_size); +struct sk_buff *build_skb(void *data, unsigned int frag_size); +struct sk_buff *build_skb_around(struct sk_buff *skb, + void *data, unsigned int frag_size); +void skb_attempt_defer_free(struct sk_buff *skb); + +u32 napi_skb_cache_get_bulk(void **skbs, u32 n); +struct sk_buff *napi_build_skb(void *data, unsigned int frag_size); +struct sk_buff *slab_build_skb(void *data); + +/** + * alloc_skb - allocate a network buffer + * @size: size to allocate + * @priority: allocation mask + * + * This function is a convenient wrapper around __alloc_skb(). + */ static inline struct sk_buff *alloc_skb(unsigned int size, gfp_t priority) { return __alloc_skb(size, priority, 0, NUMA_NO_NODE); } +struct sk_buff *alloc_skb_with_frags(unsigned long header_len, + unsigned long data_len, + int max_page_order, + int *errcode, + gfp_t gfp_mask); +struct sk_buff *alloc_skb_for_msg(struct sk_buff *first); + +/* Layout of fast clones : [skb1][skb2][fclone_ref] */ +struct sk_buff_fclones { + struct sk_buff skb1; + + struct sk_buff skb2; + + refcount_t fclone_ref; +}; + +/** + * skb_fclone_busy - check if fclone is busy + * @sk: socket + * @skb: buffer + * + * Returns: true if skb is a fast clone, and its clone is not freed. + * Some drivers call skb_orphan() in their ndo_start_xmit(), + * so we also check that didn't happen. + */ +static inline bool skb_fclone_busy(const struct sock *sk, + const struct sk_buff *skb) +{ + const struct sk_buff_fclones *fclones; + + fclones = container_of(skb, struct sk_buff_fclones, skb1); + + return skb->fclone == SKB_FCLONE_ORIG && + refcount_read(&fclones->fclone_ref) > 1 && + READ_ONCE(fclones->skb2.sk) == sk; +} + +/** + * alloc_skb_fclone - allocate a network buffer from fclone cache + * @size: size to allocate + * @priority: allocation mask + * + * This function is a convenient wrapper around __alloc_skb(). + */ static inline struct sk_buff *alloc_skb_fclone(unsigned int size, gfp_t priority) { return __alloc_skb(size, priority, SKB_ALLOC_FCLONE, NUMA_NO_NODE); } -extern struct sk_buff *__alloc_skb_head(gfp_t priority, int node); -static inline struct sk_buff *alloc_skb_head(gfp_t priority) -{ - return __alloc_skb_head(priority, -1); -} - -extern struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src); -extern int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask); -extern struct sk_buff *skb_clone(struct sk_buff *skb, - gfp_t priority); -extern struct sk_buff *skb_copy(const struct sk_buff *skb, - gfp_t priority); -extern struct sk_buff *__pskb_copy(struct sk_buff *skb, - int headroom, gfp_t gfp_mask); - -extern int pskb_expand_head(struct sk_buff *skb, - int nhead, int ntail, - gfp_t gfp_mask); -extern struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, - unsigned int headroom); -extern struct sk_buff *skb_copy_expand(const struct sk_buff *skb, - int newheadroom, int newtailroom, - gfp_t priority); -extern int skb_to_sgvec(struct sk_buff *skb, - struct scatterlist *sg, int offset, - int len); -extern int skb_cow_data(struct sk_buff *skb, int tailbits, - struct sk_buff **trailer); -extern int skb_pad(struct sk_buff *skb, int pad); +struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src); +void skb_headers_offset_update(struct sk_buff *skb, int off); +int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask); +struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority); +void skb_copy_header(struct sk_buff *new, const struct sk_buff *old); +struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t priority); +struct sk_buff *__pskb_copy_fclone(struct sk_buff *skb, int headroom, + gfp_t gfp_mask, bool fclone); +static inline struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, + gfp_t gfp_mask) +{ + return __pskb_copy_fclone(skb, headroom, gfp_mask, false); +} + +int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail, gfp_t gfp_mask); +struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, + unsigned int headroom); +struct sk_buff *skb_expand_head(struct sk_buff *skb, unsigned int headroom); +struct sk_buff *skb_copy_expand(const struct sk_buff *skb, int newheadroom, + int newtailroom, gfp_t priority); +int __must_check skb_to_sgvec_nomark(struct sk_buff *skb, struct scatterlist *sg, + int offset, int len); +int __must_check skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, + int offset, int len); +int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer); +int __skb_pad(struct sk_buff *skb, int pad, bool free_on_error); + +/** + * skb_pad - zero pad the tail of an skb + * @skb: buffer to pad + * @pad: space to pad + * + * Ensure that a buffer is followed by a padding area that is zero + * filled. Used by network drivers which may DMA or transfer data + * beyond the buffer end onto the wire. + * + * May return error in out of memory cases. The skb is freed on error. + */ +static inline int skb_pad(struct sk_buff *skb, int pad) +{ + return __skb_pad(skb, pad, true); +} #define dev_kfree_skb(a) consume_skb(a) -extern int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb, - int getfrag(void *from, char *to, int offset, - int len,int odd, struct sk_buff *skb), - void *from, int length); +int skb_append_pagefrags(struct sk_buff *skb, struct page *page, + int offset, size_t size, size_t max_frags); struct skb_seq_state { __u32 lower_offset; @@ -704,26 +1488,234 @@ struct skb_seq_state { struct sk_buff *root_skb; struct sk_buff *cur_skb; __u8 *frag_data; + __u32 frag_off; }; -extern void skb_prepare_seq_read(struct sk_buff *skb, - unsigned int from, unsigned int to, - struct skb_seq_state *st); -extern unsigned int skb_seq_read(unsigned int consumed, const u8 **data, - struct skb_seq_state *st); -extern void skb_abort_seq_read(struct skb_seq_state *st); +void skb_prepare_seq_read(struct sk_buff *skb, unsigned int from, + unsigned int to, struct skb_seq_state *st); +unsigned int skb_seq_read(unsigned int consumed, const u8 **data, + struct skb_seq_state *st); +void skb_abort_seq_read(struct skb_seq_state *st); +int skb_copy_seq_read(struct skb_seq_state *st, int offset, void *to, int len); -extern unsigned int skb_find_text(struct sk_buff *skb, unsigned int from, - unsigned int to, struct ts_config *config, - struct ts_state *state); +unsigned int skb_find_text(struct sk_buff *skb, unsigned int from, + unsigned int to, struct ts_config *config); -extern void __skb_get_rxhash(struct sk_buff *skb); -static inline __u32 skb_get_rxhash(struct sk_buff *skb) +/* + * Packet hash types specify the type of hash in skb_set_hash. + * + * Hash types refer to the protocol layer addresses which are used to + * construct a packet's hash. The hashes are used to differentiate or identify + * flows of the protocol layer for the hash type. Hash types are either + * layer-2 (L2), layer-3 (L3), or layer-4 (L4). + * + * Properties of hashes: + * + * 1) Two packets in different flows have different hash values + * 2) Two packets in the same flow should have the same hash value + * + * A hash at a higher layer is considered to be more specific. A driver should + * set the most specific hash possible. + * + * A driver cannot indicate a more specific hash than the layer at which a hash + * was computed. For instance an L3 hash cannot be set as an L4 hash. + * + * A driver may indicate a hash level which is less specific than the + * actual layer the hash was computed on. For instance, a hash computed + * at L4 may be considered an L3 hash. This should only be done if the + * driver can't unambiguously determine that the HW computed the hash at + * the higher layer. Note that the "should" in the second property above + * permits this. + */ +enum pkt_hash_types { + PKT_HASH_TYPE_NONE, /* Undefined type */ + PKT_HASH_TYPE_L2, /* Input: src_MAC, dest_MAC */ + PKT_HASH_TYPE_L3, /* Input: src_IP, dst_IP */ + PKT_HASH_TYPE_L4, /* Input: src_IP, dst_IP, src_port, dst_port */ +}; + +static inline void skb_clear_hash(struct sk_buff *skb) { - if (!skb->l4_rxhash) - __skb_get_rxhash(skb); + skb->hash = 0; + skb->sw_hash = 0; + skb->l4_hash = 0; +} - return skb->rxhash; +static inline void skb_clear_hash_if_not_l4(struct sk_buff *skb) +{ + if (!skb->l4_hash) + skb_clear_hash(skb); +} + +static inline void +__skb_set_hash(struct sk_buff *skb, __u32 hash, bool is_sw, bool is_l4) +{ + skb->l4_hash = is_l4; + skb->sw_hash = is_sw; + skb->hash = hash; +} + +static inline void +skb_set_hash(struct sk_buff *skb, __u32 hash, enum pkt_hash_types type) +{ + /* Used by drivers to set hash from HW */ + __skb_set_hash(skb, hash, false, type == PKT_HASH_TYPE_L4); +} + +static inline void +__skb_set_sw_hash(struct sk_buff *skb, __u32 hash, bool is_l4) +{ + __skb_set_hash(skb, hash, true, is_l4); +} + +u32 __skb_get_hash_symmetric_net(const struct net *net, const struct sk_buff *skb); + +static inline u32 __skb_get_hash_symmetric(const struct sk_buff *skb) +{ + return __skb_get_hash_symmetric_net(NULL, skb); +} + +void __skb_get_hash_net(const struct net *net, struct sk_buff *skb); +u32 skb_get_poff(const struct sk_buff *skb); +u32 __skb_get_poff(const struct sk_buff *skb, const void *data, + const struct flow_keys_basic *keys, int hlen); +__be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, + const void *data, int hlen_proto); + +void skb_flow_dissector_init(struct flow_dissector *flow_dissector, + const struct flow_dissector_key *key, + unsigned int key_count); + +struct bpf_flow_dissector; +u32 bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx, + __be16 proto, int nhoff, int hlen, unsigned int flags); + +bool __skb_flow_dissect(const struct net *net, + const struct sk_buff *skb, + struct flow_dissector *flow_dissector, + void *target_container, const void *data, + __be16 proto, int nhoff, int hlen, unsigned int flags); + +static inline bool skb_flow_dissect(const struct sk_buff *skb, + struct flow_dissector *flow_dissector, + void *target_container, unsigned int flags) +{ + return __skb_flow_dissect(NULL, skb, flow_dissector, + target_container, NULL, 0, 0, 0, flags); +} + +static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb, + struct flow_keys *flow, + unsigned int flags) +{ + memset(flow, 0, sizeof(*flow)); + return __skb_flow_dissect(NULL, skb, &flow_keys_dissector, + flow, NULL, 0, 0, 0, flags); +} + +static inline bool +skb_flow_dissect_flow_keys_basic(const struct net *net, + const struct sk_buff *skb, + struct flow_keys_basic *flow, + const void *data, __be16 proto, + int nhoff, int hlen, unsigned int flags) +{ + memset(flow, 0, sizeof(*flow)); + return __skb_flow_dissect(net, skb, &flow_keys_basic_dissector, flow, + data, proto, nhoff, hlen, flags); +} + +void skb_flow_dissect_meta(const struct sk_buff *skb, + struct flow_dissector *flow_dissector, + void *target_container); + +/* Gets a skb connection tracking info, ctinfo map should be a + * map of mapsize to translate enum ip_conntrack_info states + * to user states. + */ +void +skb_flow_dissect_ct(const struct sk_buff *skb, + struct flow_dissector *flow_dissector, + void *target_container, + u16 *ctinfo_map, size_t mapsize, + bool post_ct, u16 zone); +void +skb_flow_dissect_tunnel_info(const struct sk_buff *skb, + struct flow_dissector *flow_dissector, + void *target_container); + +void skb_flow_dissect_hash(const struct sk_buff *skb, + struct flow_dissector *flow_dissector, + void *target_container); + +static inline __u32 skb_get_hash_net(const struct net *net, struct sk_buff *skb) +{ + if (!skb->l4_hash && !skb->sw_hash) + __skb_get_hash_net(net, skb); + + return skb->hash; +} + +static inline __u32 skb_get_hash(struct sk_buff *skb) +{ + if (!skb->l4_hash && !skb->sw_hash) + __skb_get_hash_net(NULL, skb); + + return skb->hash; +} + +static inline __u32 skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6) +{ + if (!skb->l4_hash && !skb->sw_hash) { + struct flow_keys keys; + __u32 hash = __get_hash_from_flowi6(fl6, &keys); + + __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys)); + } + + return skb->hash; +} + +__u32 skb_get_hash_perturb(const struct sk_buff *skb, + const siphash_key_t *perturb); + +static inline __u32 skb_get_hash_raw(const struct sk_buff *skb) +{ + return skb->hash; +} + +static inline void skb_copy_hash(struct sk_buff *to, const struct sk_buff *from) +{ + to->hash = from->hash; + to->sw_hash = from->sw_hash; + to->l4_hash = from->l4_hash; +}; + +static inline int skb_cmp_decrypted(const struct sk_buff *skb1, + const struct sk_buff *skb2) +{ +#ifdef CONFIG_SKB_DECRYPTED + return skb2->decrypted - skb1->decrypted; +#else + return 0; +#endif +} + +static inline bool skb_is_decrypted(const struct sk_buff *skb) +{ +#ifdef CONFIG_SKB_DECRYPTED + return skb->decrypted; +#else + return false; +#endif +} + +static inline void skb_copy_decrypted(struct sk_buff *to, + const struct sk_buff *from) +{ +#ifdef CONFIG_SKB_DECRYPTED + to->decrypted = from->decrypted; +#endif } #ifdef NET_SKBUFF_DATA_USES_OFFSET @@ -736,6 +1728,11 @@ static inline unsigned int skb_end_offset(const struct sk_buff *skb) { return skb->end; } + +static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset) +{ + skb->end = offset; +} #else static inline unsigned char *skb_end_pointer(const struct sk_buff *skb) { @@ -746,8 +1743,42 @@ static inline unsigned int skb_end_offset(const struct sk_buff *skb) { return skb->end - skb->head; } + +static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset) +{ + skb->end = skb->head + offset; +} #endif +extern const struct ubuf_info_ops msg_zerocopy_ubuf_ops; + +struct ubuf_info *msg_zerocopy_realloc(struct sock *sk, size_t size, + struct ubuf_info *uarg, bool devmem); + +void msg_zerocopy_put_abort(struct ubuf_info *uarg, bool have_uref); + +struct net_devmem_dmabuf_binding; + +int __zerocopy_sg_from_iter(struct msghdr *msg, struct sock *sk, + struct sk_buff *skb, struct iov_iter *from, + size_t length, + struct net_devmem_dmabuf_binding *binding); + +int zerocopy_fill_skb_from_iter(struct sk_buff *skb, + struct iov_iter *from, size_t length); + +static inline int skb_zerocopy_iter_dgram(struct sk_buff *skb, + struct msghdr *msg, int len) +{ + return __zerocopy_sg_from_iter(msg, skb->sk, skb, &msg->msg_iter, len, + NULL); +} + +int skb_zerocopy_iter_stream(struct sock *sk, struct sk_buff *skb, + struct msghdr *msg, int len, + struct ubuf_info *uarg, + struct net_devmem_dmabuf_binding *binding); + /* Internal */ #define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB))) @@ -756,6 +1787,134 @@ static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb) return &skb_shinfo(skb)->hwtstamps; } +static inline struct ubuf_info *skb_zcopy(struct sk_buff *skb) +{ + bool is_zcopy = skb && skb_shinfo(skb)->flags & SKBFL_ZEROCOPY_ENABLE; + + return is_zcopy ? skb_uarg(skb) : NULL; +} + +static inline bool skb_zcopy_pure(const struct sk_buff *skb) +{ + return skb_shinfo(skb)->flags & SKBFL_PURE_ZEROCOPY; +} + +static inline bool skb_zcopy_managed(const struct sk_buff *skb) +{ + return skb_shinfo(skb)->flags & SKBFL_MANAGED_FRAG_REFS; +} + +static inline bool skb_pure_zcopy_same(const struct sk_buff *skb1, + const struct sk_buff *skb2) +{ + return skb_zcopy_pure(skb1) == skb_zcopy_pure(skb2); +} + +static inline void net_zcopy_get(struct ubuf_info *uarg) +{ + refcount_inc(&uarg->refcnt); +} + +static inline void skb_zcopy_init(struct sk_buff *skb, struct ubuf_info *uarg) +{ + skb_shinfo(skb)->destructor_arg = uarg; + skb_shinfo(skb)->flags |= uarg->flags; +} + +static inline void skb_zcopy_set(struct sk_buff *skb, struct ubuf_info *uarg, + bool *have_ref) +{ + if (skb && uarg && !skb_zcopy(skb)) { + if (unlikely(have_ref && *have_ref)) + *have_ref = false; + else + net_zcopy_get(uarg); + skb_zcopy_init(skb, uarg); + } +} + +static inline void skb_zcopy_set_nouarg(struct sk_buff *skb, void *val) +{ + skb_shinfo(skb)->destructor_arg = (void *)((uintptr_t) val | 0x1UL); + skb_shinfo(skb)->flags |= SKBFL_ZEROCOPY_FRAG; +} + +static inline bool skb_zcopy_is_nouarg(struct sk_buff *skb) +{ + return (uintptr_t) skb_shinfo(skb)->destructor_arg & 0x1UL; +} + +static inline void *skb_zcopy_get_nouarg(struct sk_buff *skb) +{ + return (void *)((uintptr_t) skb_shinfo(skb)->destructor_arg & ~0x1UL); +} + +static inline void net_zcopy_put(struct ubuf_info *uarg) +{ + if (uarg) + uarg->ops->complete(NULL, uarg, true); +} + +static inline void net_zcopy_put_abort(struct ubuf_info *uarg, bool have_uref) +{ + if (uarg) { + if (uarg->ops == &msg_zerocopy_ubuf_ops) + msg_zerocopy_put_abort(uarg, have_uref); + else if (have_uref) + net_zcopy_put(uarg); + } +} + +/* Release a reference on a zerocopy structure */ +static inline void skb_zcopy_clear(struct sk_buff *skb, bool zerocopy_success) +{ + struct ubuf_info *uarg = skb_zcopy(skb); + + if (uarg) { + if (!skb_zcopy_is_nouarg(skb)) + uarg->ops->complete(skb, uarg, zerocopy_success); + + skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY; + } +} + +void __skb_zcopy_downgrade_managed(struct sk_buff *skb); + +static inline void skb_zcopy_downgrade_managed(struct sk_buff *skb) +{ + if (unlikely(skb_zcopy_managed(skb))) + __skb_zcopy_downgrade_managed(skb); +} + +/* Return true if frags in this skb are readable by the host. */ +static inline bool skb_frags_readable(const struct sk_buff *skb) +{ + return !skb->unreadable; +} + +static inline void skb_mark_not_on_list(struct sk_buff *skb) +{ + skb->next = NULL; +} + +static inline void skb_poison_list(struct sk_buff *skb) +{ +#ifdef CONFIG_DEBUG_NET + skb->next = SKB_LIST_POISON_NEXT; +#endif +} + +/* Iterate through singly-linked GSO fragments of an skb. */ +#define skb_list_walk_safe(first, skb, next_skb) \ + for ((skb) = (first), (next_skb) = (skb) ? (skb)->next : NULL; (skb); \ + (skb) = (next_skb), (next_skb) = (skb) ? (skb)->next : NULL) + +static inline void skb_list_del_init(struct sk_buff *skb) +{ + __list_del_entry(&skb->list); + skb_mark_not_on_list(skb); +} + /** * skb_queue_empty - check if a queue is empty * @list: queue head @@ -764,9 +1923,22 @@ static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb) */ static inline int skb_queue_empty(const struct sk_buff_head *list) { - return list->next == (struct sk_buff *)list; + return list->next == (const struct sk_buff *) list; +} + +/** + * skb_queue_empty_lockless - check if a queue is empty + * @list: queue head + * + * Returns true if the queue is empty, false otherwise. + * This variant can be used in lockless contexts. + */ +static inline bool skb_queue_empty_lockless(const struct sk_buff_head *list) +{ + return READ_ONCE(list->next) == (const struct sk_buff *) list; } + /** * skb_queue_is_last - check if skb is the last entry in the queue * @list: queue head @@ -777,7 +1949,7 @@ static inline int skb_queue_empty(const struct sk_buff_head *list) static inline bool skb_queue_is_last(const struct sk_buff_head *list, const struct sk_buff *skb) { - return skb->next == (struct sk_buff *)list; + return skb->next == (const struct sk_buff *) list; } /** @@ -790,7 +1962,7 @@ static inline bool skb_queue_is_last(const struct sk_buff_head *list, static inline bool skb_queue_is_first(const struct sk_buff_head *list, const struct sk_buff *skb) { - return skb->prev == (struct sk_buff *)list; + return skb->prev == (const struct sk_buff *) list; } /** @@ -838,13 +2010,12 @@ static inline struct sk_buff *skb_queue_prev(const struct sk_buff_head *list, */ static inline struct sk_buff *skb_get(struct sk_buff *skb) { - atomic_inc(&skb->users); + refcount_inc(&skb->users); return skb; } /* - * If users == 1, we are the only owner and are can avoid redundant - * atomic change. + * If users == 1, we are the only owner and can avoid redundant atomic changes. */ /** @@ -863,7 +2034,7 @@ static inline int skb_cloned(const struct sk_buff *skb) static inline int skb_unclone(struct sk_buff *skb, gfp_t pri) { - might_sleep_if(pri & __GFP_WAIT); + might_sleep_if(gfpflags_allow_blocking(pri)); if (skb_cloned(skb)) return pskb_expand_head(skb, 0, 0, pri); @@ -871,6 +2042,22 @@ static inline int skb_unclone(struct sk_buff *skb, gfp_t pri) return 0; } +/* This variant of skb_unclone() makes sure skb->truesize + * and skb_end_offset() are not changed, whenever a new skb->head is needed. + * + * Indeed there is no guarantee that ksize(kmalloc(X)) == ksize(kmalloc(X)) + * when various debugging features are in place. + */ +int __skb_unclone_keeptruesize(struct sk_buff *skb, gfp_t pri); +static inline int skb_unclone_keeptruesize(struct sk_buff *skb, gfp_t pri) +{ + might_sleep_if(gfpflags_allow_blocking(pri)); + + if (skb_cloned(skb)) + return __skb_unclone_keeptruesize(skb, pri); + return 0; +} + /** * skb_header_cloned - is the header a clone * @skb: buffer to check @@ -890,21 +2077,29 @@ static inline int skb_header_cloned(const struct sk_buff *skb) return dataref != 1; } +static inline int skb_header_unclone(struct sk_buff *skb, gfp_t pri) +{ + might_sleep_if(gfpflags_allow_blocking(pri)); + + if (skb_header_cloned(skb)) + return pskb_expand_head(skb, 0, 0, pri); + + return 0; +} + /** - * skb_header_release - release reference to header - * @skb: buffer to operate on + * __skb_header_release() - allow clones to use the headroom + * @skb: buffer to operate on * - * Drop a reference to the header part of the buffer. This is done - * by acquiring a payload reference. You must not read from the header - * part of skb->data after this. + * See "DOC: dataref and headerless skbs". */ -static inline void skb_header_release(struct sk_buff *skb) +static inline void __skb_header_release(struct sk_buff *skb) { - BUG_ON(skb->nohdr); skb->nohdr = 1; - atomic_add(1 << SKB_DATAREF_SHIFT, &skb_shinfo(skb)->dataref); + atomic_set(&skb_shinfo(skb)->dataref, 1 + (1 << SKB_DATAREF_SHIFT)); } + /** * skb_shared - is the buffer shared * @skb: buffer to check @@ -914,7 +2109,7 @@ static inline void skb_header_release(struct sk_buff *skb) */ static inline int skb_shared(const struct sk_buff *skb) { - return atomic_read(&skb->users) != 1; + return refcount_read(&skb->users) != 1; } /** @@ -932,7 +2127,7 @@ static inline int skb_shared(const struct sk_buff *skb) */ static inline struct sk_buff *skb_share_check(struct sk_buff *skb, gfp_t pri) { - might_sleep_if(pri & __GFP_WAIT); + might_sleep_if(gfpflags_allow_blocking(pri)); if (skb_shared(skb)) { struct sk_buff *nskb = skb_clone(skb, pri); @@ -949,7 +2144,7 @@ static inline struct sk_buff *skb_share_check(struct sk_buff *skb, gfp_t pri) * Copy shared buffers into a new sk_buff. We effectively do COW on * packets to handle cases where we have a local reader and forward * and a couple of other messy ones. The normal one is tcpdumping - * a packet thats being forwarded. + * a packet that's being forwarded. */ /** @@ -968,10 +2163,15 @@ static inline struct sk_buff *skb_share_check(struct sk_buff *skb, gfp_t pri) static inline struct sk_buff *skb_unshare(struct sk_buff *skb, gfp_t pri) { - might_sleep_if(pri & __GFP_WAIT); + might_sleep_if(gfpflags_allow_blocking(pri)); if (skb_cloned(skb)) { struct sk_buff *nskb = skb_copy(skb, pri); - kfree_skb(skb); /* Free our shared copy */ + + /* Free our shared copy */ + if (likely(nskb)) + consume_skb(skb); + else + kfree_skb(skb); skb = nskb; } return skb; @@ -1000,6 +2200,17 @@ static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_) } /** + * __skb_peek - peek at the head of a non-empty &sk_buff_head + * @list_: list to peek at + * + * Like skb_peek(), but the caller knows that the list is not empty. + */ +static inline struct sk_buff *__skb_peek(const struct sk_buff_head *list_) +{ + return list_->next; +} + +/** * skb_peek_next - peek skb following the given one from a queue * @skb: skb to start from * @list_: list to peek at @@ -1033,7 +2244,7 @@ static inline struct sk_buff *skb_peek_next(struct sk_buff *skb, */ static inline struct sk_buff *skb_peek_tail(const struct sk_buff_head *list_) { - struct sk_buff *skb = list_->prev; + struct sk_buff *skb = READ_ONCE(list_->prev); if (skb == (struct sk_buff *)list_) skb = NULL; @@ -1053,6 +2264,18 @@ static inline __u32 skb_queue_len(const struct sk_buff_head *list_) } /** + * skb_queue_len_lockless - get queue length + * @list_: list to measure + * + * Return the length of an &sk_buff queue. + * This variant can be used in lockless contexts. + */ +static inline __u32 skb_queue_len_lockless(const struct sk_buff_head *list_) +{ + return READ_ONCE(list_->qlen); +} + +/** * __skb_queue_head_init - initialize non-spinlock portions of sk_buff_head * @list: queue to initialize * @@ -1095,15 +2318,18 @@ static inline void skb_queue_head_init_class(struct sk_buff_head *list, * The "__skb_xxxx()" functions are the non-atomic ones that * can only be called with interrupts disabled. */ -extern void skb_insert(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list); static inline void __skb_insert(struct sk_buff *newsk, struct sk_buff *prev, struct sk_buff *next, struct sk_buff_head *list) { - newsk->next = next; - newsk->prev = prev; - next->prev = prev->next = newsk; - list->qlen++; + /* See skb_queue_empty_lockless() and skb_peek_tail() + * for the opposite READ_ONCE() + */ + WRITE_ONCE(newsk->next, next); + WRITE_ONCE(newsk->prev, prev); + WRITE_ONCE(((struct sk_buff_list *)next)->prev, newsk); + WRITE_ONCE(((struct sk_buff_list *)prev)->next, newsk); + WRITE_ONCE(list->qlen, list->qlen + 1); } static inline void __skb_queue_splice(const struct sk_buff_head *list, @@ -1113,11 +2339,11 @@ static inline void __skb_queue_splice(const struct sk_buff_head *list, struct sk_buff *first = list->next; struct sk_buff *last = list->prev; - first->prev = prev; - prev->next = first; + WRITE_ONCE(first->prev, prev); + WRITE_ONCE(prev->next, first); - last->next = next; - next->prev = last; + WRITE_ONCE(last->next, next); + WRITE_ONCE(next->prev, last); } /** @@ -1198,17 +2424,17 @@ static inline void __skb_queue_after(struct sk_buff_head *list, struct sk_buff *prev, struct sk_buff *newsk) { - __skb_insert(newsk, prev, prev->next, list); + __skb_insert(newsk, prev, ((struct sk_buff_list *)prev)->next, list); } -extern void skb_append(struct sk_buff *old, struct sk_buff *newsk, - struct sk_buff_head *list); +void skb_append(struct sk_buff *old, struct sk_buff *newsk, + struct sk_buff_head *list); static inline void __skb_queue_before(struct sk_buff_head *list, struct sk_buff *next, struct sk_buff *newsk) { - __skb_insert(newsk, next->prev, next, list); + __skb_insert(newsk, ((struct sk_buff_list *)next)->prev, next, list); } /** @@ -1221,12 +2447,12 @@ static inline void __skb_queue_before(struct sk_buff_head *list, * * A buffer cannot be placed on two lists at the same time. */ -extern void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk); static inline void __skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk) { __skb_queue_after(list, (struct sk_buff *)list, newsk); } +void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk); /** * __skb_queue_tail - queue a buffer at the list tail @@ -1238,28 +2464,28 @@ static inline void __skb_queue_head(struct sk_buff_head *list, * * A buffer cannot be placed on two lists at the same time. */ -extern void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk); static inline void __skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk) { __skb_queue_before(list, (struct sk_buff *)list, newsk); } +void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk); /* * remove sk_buff from list. _Must_ be called atomically, and with * the list known.. */ -extern void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list); +void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list); static inline void __skb_unlink(struct sk_buff *skb, struct sk_buff_head *list) { struct sk_buff *next, *prev; - list->qlen--; + WRITE_ONCE(list->qlen, list->qlen - 1); next = skb->next; prev = skb->prev; skb->next = skb->prev = NULL; - next->prev = prev; - prev->next = next; + WRITE_ONCE(next->prev, prev); + WRITE_ONCE(prev->next, next); } /** @@ -1270,7 +2496,6 @@ static inline void __skb_unlink(struct sk_buff *skb, struct sk_buff_head *list) * so must be used with appropriate locks held only. The head item is * returned or %NULL if the list is empty. */ -extern struct sk_buff *skb_dequeue(struct sk_buff_head *list); static inline struct sk_buff *__skb_dequeue(struct sk_buff_head *list) { struct sk_buff *skb = skb_peek(list); @@ -1278,6 +2503,7 @@ static inline struct sk_buff *__skb_dequeue(struct sk_buff_head *list) __skb_unlink(skb, list); return skb; } +struct sk_buff *skb_dequeue(struct sk_buff_head *list); /** * __skb_dequeue_tail - remove from the tail of the queue @@ -1287,7 +2513,6 @@ static inline struct sk_buff *__skb_dequeue(struct sk_buff_head *list) * so must be used with appropriate locks held only. The tail item is * returned or %NULL if the list is empty. */ -extern struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list); static inline struct sk_buff *__skb_dequeue_tail(struct sk_buff_head *list) { struct sk_buff *skb = skb_peek_tail(list); @@ -1295,6 +2520,7 @@ static inline struct sk_buff *__skb_dequeue_tail(struct sk_buff_head *list) __skb_unlink(skb, list); return skb; } +struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list); static inline bool skb_is_nonlinear(const struct sk_buff *skb) @@ -1307,20 +2533,70 @@ static inline unsigned int skb_headlen(const struct sk_buff *skb) return skb->len - skb->data_len; } -static inline int skb_pagelen(const struct sk_buff *skb) +static inline unsigned int __skb_pagelen(const struct sk_buff *skb) { - int i, len = 0; + unsigned int i, len = 0; - for (i = (int)skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) + for (i = skb_shinfo(skb)->nr_frags - 1; (int)i >= 0; i--) len += skb_frag_size(&skb_shinfo(skb)->frags[i]); - return len + skb_headlen(skb); + return len; +} + +static inline unsigned int skb_pagelen(const struct sk_buff *skb) +{ + return skb_headlen(skb) + __skb_pagelen(skb); +} + +static inline void skb_frag_fill_netmem_desc(skb_frag_t *frag, + netmem_ref netmem, int off, + int size) +{ + frag->netmem = netmem; + frag->offset = off; + skb_frag_size_set(frag, size); +} + +static inline void skb_frag_fill_page_desc(skb_frag_t *frag, + struct page *page, + int off, int size) +{ + skb_frag_fill_netmem_desc(frag, page_to_netmem(page), off, size); +} + +static inline void __skb_fill_netmem_desc_noacc(struct skb_shared_info *shinfo, + int i, netmem_ref netmem, + int off, int size) +{ + skb_frag_t *frag = &shinfo->frags[i]; + + skb_frag_fill_netmem_desc(frag, netmem, off, size); +} + +static inline void __skb_fill_page_desc_noacc(struct skb_shared_info *shinfo, + int i, struct page *page, + int off, int size) +{ + __skb_fill_netmem_desc_noacc(shinfo, i, page_to_netmem(page), off, + size); +} + +/** + * skb_len_add - adds a number to len fields of skb + * @skb: buffer to add len to + * @delta: number of bytes to add + */ +static inline void skb_len_add(struct sk_buff *skb, int delta) +{ + skb->len += delta; + skb->data_len += delta; + skb->truesize += delta; } /** - * __skb_fill_page_desc - initialise a paged fragment in an skb + * __skb_fill_netmem_desc - initialise a fragment in an skb * @skb: buffer containing fragment to be initialised - * @i: paged fragment index to initialise - * @page: the page to use for this fragment + * @i: fragment index to initialise + * @netmem: the netmem to use for this fragment * @off: the offset to the data with @page * @size: the length of the data * @@ -1329,27 +2605,40 @@ static inline int skb_pagelen(const struct sk_buff *skb) * * Does not take any additional reference on the fragment. */ -static inline void __skb_fill_page_desc(struct sk_buff *skb, int i, - struct page *page, int off, int size) +static inline void __skb_fill_netmem_desc(struct sk_buff *skb, int i, + netmem_ref netmem, int off, int size) { - skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + struct page *page; - /* - * Propagate page->pfmemalloc to the skb if we can. The problem is - * that not all callers have unique ownership of the page. If - * pfmemalloc is set, we check the mapping as a mapping implies - * page->index is set (index and pfmemalloc share space). - * If it's a valid mapping, we cannot use page->pfmemalloc but we - * do not lose pfmemalloc information as the pages would not be - * allocated using __GFP_MEMALLOC. - */ - frag->page.p = page; - frag->page_offset = off; - skb_frag_size_set(frag, size); + __skb_fill_netmem_desc_noacc(skb_shinfo(skb), i, netmem, off, size); + + if (netmem_is_net_iov(netmem)) { + skb->unreadable = true; + return; + } + + page = netmem_to_page(netmem); + /* Propagate page pfmemalloc to the skb if we can. The problem is + * that not all callers have unique ownership of the page but rely + * on page_is_pfmemalloc doing the right thing(tm). + */ page = compound_head(page); - if (page->pfmemalloc && !page->mapping) - skb->pfmemalloc = true; + if (page_is_pfmemalloc(page)) + skb->pfmemalloc = true; +} + +static inline void __skb_fill_page_desc(struct sk_buff *skb, int i, + struct page *page, int off, int size) +{ + __skb_fill_netmem_desc(skb, i, page_to_netmem(page), off, size); +} + +static inline void skb_fill_netmem_desc(struct sk_buff *skb, int i, + netmem_ref netmem, int off, int size) +{ + __skb_fill_netmem_desc(skb, i, netmem, off, size); + skb_shinfo(skb)->nr_frags = i + 1; } /** @@ -1361,7 +2650,7 @@ static inline void __skb_fill_page_desc(struct sk_buff *skb, int i, * @size: the length of the data * * As per __skb_fill_page_desc() -- initialises the @i'th fragment of - * @skb to point to &size bytes at offset @off within @page. In + * @skb to point to @size bytes at offset @off within @page. In * addition updates @skb such that @i is the last fragment. * * Does not take any additional reference on the fragment. @@ -1369,15 +2658,44 @@ static inline void __skb_fill_page_desc(struct sk_buff *skb, int i, static inline void skb_fill_page_desc(struct sk_buff *skb, int i, struct page *page, int off, int size) { - __skb_fill_page_desc(skb, i, page, off, size); - skb_shinfo(skb)->nr_frags = i + 1; + skb_fill_netmem_desc(skb, i, page_to_netmem(page), off, size); +} + +/** + * skb_fill_page_desc_noacc - initialise a paged fragment in an skb + * @skb: buffer containing fragment to be initialised + * @i: paged fragment index to initialise + * @page: the page to use for this fragment + * @off: the offset to the data with @page + * @size: the length of the data + * + * Variant of skb_fill_page_desc() which does not deal with + * pfmemalloc, if page is not owned by us. + */ +static inline void skb_fill_page_desc_noacc(struct sk_buff *skb, int i, + struct page *page, int off, + int size) +{ + struct skb_shared_info *shinfo = skb_shinfo(skb); + + __skb_fill_page_desc_noacc(shinfo, i, page, off, size); + shinfo->nr_frags = i + 1; } -extern void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, +void skb_add_rx_frag_netmem(struct sk_buff *skb, int i, netmem_ref netmem, int off, int size, unsigned int truesize); -#define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags) -#define SKB_FRAG_ASSERT(skb) BUG_ON(skb_has_frag_list(skb)) +static inline void skb_add_rx_frag(struct sk_buff *skb, int i, + struct page *page, int off, int size, + unsigned int truesize) +{ + skb_add_rx_frag_netmem(skb, i, page_to_netmem(page), off, size, + truesize); +} + +void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int size, + unsigned int truesize); + #define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb)) #ifdef NET_SKBUFF_DATA_USES_OFFSET @@ -1415,65 +2733,150 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset) #endif /* NET_SKBUFF_DATA_USES_OFFSET */ +static inline void skb_assert_len(struct sk_buff *skb) +{ +#ifdef CONFIG_DEBUG_NET + if (WARN_ONCE(!skb->len, "%s\n", __func__)) + DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false); +#endif /* CONFIG_DEBUG_NET */ +} + +#if defined(CONFIG_FAIL_SKB_REALLOC) +void skb_might_realloc(struct sk_buff *skb); +#else +static inline void skb_might_realloc(struct sk_buff *skb) {} +#endif + /* * Add data to an sk_buff */ -extern unsigned char *skb_put(struct sk_buff *skb, unsigned int len); -static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len) +void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len); +void *skb_put(struct sk_buff *skb, unsigned int len); +static inline void *__skb_put(struct sk_buff *skb, unsigned int len) { - unsigned char *tmp = skb_tail_pointer(skb); + void *tmp = skb_tail_pointer(skb); SKB_LINEAR_ASSERT(skb); skb->tail += len; skb->len += len; return tmp; } -extern unsigned char *skb_push(struct sk_buff *skb, unsigned int len); -static inline unsigned char *__skb_push(struct sk_buff *skb, unsigned int len) +static inline void *__skb_put_zero(struct sk_buff *skb, unsigned int len) { + void *tmp = __skb_put(skb, len); + + memset(tmp, 0, len); + return tmp; +} + +static inline void *__skb_put_data(struct sk_buff *skb, const void *data, + unsigned int len) +{ + void *tmp = __skb_put(skb, len); + + memcpy(tmp, data, len); + return tmp; +} + +static inline void __skb_put_u8(struct sk_buff *skb, u8 val) +{ + *(u8 *)__skb_put(skb, 1) = val; +} + +static inline void *skb_put_zero(struct sk_buff *skb, unsigned int len) +{ + void *tmp = skb_put(skb, len); + + memset(tmp, 0, len); + + return tmp; +} + +static inline void *skb_put_data(struct sk_buff *skb, const void *data, + unsigned int len) +{ + void *tmp = skb_put(skb, len); + + memcpy(tmp, data, len); + + return tmp; +} + +static inline void skb_put_u8(struct sk_buff *skb, u8 val) +{ + *(u8 *)skb_put(skb, 1) = val; +} + +void *skb_push(struct sk_buff *skb, unsigned int len); +static inline void *__skb_push(struct sk_buff *skb, unsigned int len) +{ + DEBUG_NET_WARN_ON_ONCE(len > INT_MAX); + skb->data -= len; skb->len += len; return skb->data; } -extern unsigned char *skb_pull(struct sk_buff *skb, unsigned int len); -static inline unsigned char *__skb_pull(struct sk_buff *skb, unsigned int len) +void *skb_pull(struct sk_buff *skb, unsigned int len); +static inline void *__skb_pull(struct sk_buff *skb, unsigned int len) { + DEBUG_NET_WARN_ON_ONCE(len > INT_MAX); + skb->len -= len; - BUG_ON(skb->len < skb->data_len); + if (unlikely(skb->len < skb->data_len)) { +#if defined(CONFIG_DEBUG_NET) + skb->len += len; + pr_err("__skb_pull(len=%u)\n", len); + skb_dump(KERN_ERR, skb, false); +#endif + BUG(); + } return skb->data += len; } -static inline unsigned char *skb_pull_inline(struct sk_buff *skb, unsigned int len) +static inline void *skb_pull_inline(struct sk_buff *skb, unsigned int len) { return unlikely(len > skb->len) ? NULL : __skb_pull(skb, len); } -extern unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta); +void *skb_pull_data(struct sk_buff *skb, size_t len); -static inline unsigned char *__pskb_pull(struct sk_buff *skb, unsigned int len) +void *__pskb_pull_tail(struct sk_buff *skb, int delta); + +static inline enum skb_drop_reason +pskb_may_pull_reason(struct sk_buff *skb, unsigned int len) { - if (len > skb_headlen(skb) && - !__pskb_pull_tail(skb, len - skb_headlen(skb))) - return NULL; - skb->len -= len; - return skb->data += len; + DEBUG_NET_WARN_ON_ONCE(len > INT_MAX); + skb_might_realloc(skb); + + if (likely(len <= skb_headlen(skb))) + return SKB_NOT_DROPPED_YET; + + if (unlikely(len > skb->len)) + return SKB_DROP_REASON_PKT_TOO_SMALL; + + if (unlikely(!__pskb_pull_tail(skb, len - skb_headlen(skb)))) + return SKB_DROP_REASON_NOMEM; + + return SKB_NOT_DROPPED_YET; } -static inline unsigned char *pskb_pull(struct sk_buff *skb, unsigned int len) +static inline bool pskb_may_pull(struct sk_buff *skb, unsigned int len) { - return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len); + return pskb_may_pull_reason(skb, len) == SKB_NOT_DROPPED_YET; } -static inline int pskb_may_pull(struct sk_buff *skb, unsigned int len) +static inline void *pskb_pull(struct sk_buff *skb, unsigned int len) { - if (likely(len <= skb_headlen(skb))) - return 1; - if (unlikely(len > skb->len)) - return 0; - return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL; + if (!pskb_may_pull(skb, len)) + return NULL; + + skb->len -= len; + return skb->data += len; } +void skb_condense(struct sk_buff *skb); + /** * skb_headroom - bytes at buffer head * @skb: buffer to check @@ -1525,6 +2928,47 @@ static inline void skb_reserve(struct sk_buff *skb, int len) skb->tail += len; } +/** + * skb_tailroom_reserve - adjust reserved_tailroom + * @skb: buffer to alter + * @mtu: maximum amount of headlen permitted + * @needed_tailroom: minimum amount of reserved_tailroom + * + * Set reserved_tailroom so that headlen can be as large as possible but + * not larger than mtu and tailroom cannot be smaller than + * needed_tailroom. + * The required headroom should already have been reserved before using + * this function. + */ +static inline void skb_tailroom_reserve(struct sk_buff *skb, unsigned int mtu, + unsigned int needed_tailroom) +{ + SKB_LINEAR_ASSERT(skb); + if (mtu < skb_tailroom(skb) - needed_tailroom) + /* use at most mtu */ + skb->reserved_tailroom = skb_tailroom(skb) - mtu; + else + /* use up to all available space */ + skb->reserved_tailroom = needed_tailroom; +} + +#define ENCAP_TYPE_ETHER 0 +#define ENCAP_TYPE_IPPROTO 1 + +static inline void skb_set_inner_protocol(struct sk_buff *skb, + __be16 protocol) +{ + skb->inner_protocol = protocol; + skb->inner_protocol_type = ENCAP_TYPE_ETHER; +} + +static inline void skb_set_inner_ipproto(struct sk_buff *skb, + __u8 ipproto) +{ + skb->inner_ipproto = ipproto; + skb->inner_protocol_type = ENCAP_TYPE_IPPROTO; +} + static inline void skb_reset_inner_headers(struct sk_buff *skb) { skb->inner_mac_header = skb->mac_header; @@ -1532,9 +2976,19 @@ static inline void skb_reset_inner_headers(struct sk_buff *skb) skb->inner_transport_header = skb->transport_header; } +static inline int skb_mac_header_was_set(const struct sk_buff *skb) +{ + return skb->mac_header != (typeof(skb->mac_header))~0U; +} + static inline void skb_reset_mac_len(struct sk_buff *skb) { - skb->mac_len = skb->network_header - skb->mac_header; + if (!skb_mac_header_was_set(skb)) { + DEBUG_NET_WARN_ON_ONCE(1); + skb->mac_len = 0; + } else { + skb->mac_len = skb->network_header - skb->mac_header; + } } static inline unsigned char *skb_inner_transport_header(const struct sk_buff @@ -1543,9 +2997,17 @@ static inline unsigned char *skb_inner_transport_header(const struct sk_buff return skb->head + skb->inner_transport_header; } +static inline int skb_inner_transport_offset(const struct sk_buff *skb) +{ + return skb_inner_transport_header(skb) - skb->data; +} + static inline void skb_reset_inner_transport_header(struct sk_buff *skb) { - skb->inner_transport_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->inner_transport_header))offset); + skb->inner_transport_header = offset; } static inline void skb_set_inner_transport_header(struct sk_buff *skb, @@ -1562,7 +3024,10 @@ static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb) static inline void skb_reset_inner_network_header(struct sk_buff *skb) { - skb->inner_network_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->inner_network_header))offset); + skb->inner_network_header = offset; } static inline void skb_set_inner_network_header(struct sk_buff *skb, @@ -1572,6 +3037,11 @@ static inline void skb_set_inner_network_header(struct sk_buff *skb, skb->inner_network_header += offset; } +static inline bool skb_inner_network_header_was_set(const struct sk_buff *skb) +{ + return skb->inner_network_header > 0; +} + static inline unsigned char *skb_inner_mac_header(const struct sk_buff *skb) { return skb->head + skb->inner_mac_header; @@ -1579,7 +3049,10 @@ static inline unsigned char *skb_inner_mac_header(const struct sk_buff *skb) static inline void skb_reset_inner_mac_header(struct sk_buff *skb) { - skb->inner_mac_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->inner_mac_header))offset); + skb->inner_mac_header = offset; } static inline void skb_set_inner_mac_header(struct sk_buff *skb, @@ -1595,12 +3068,39 @@ static inline bool skb_transport_header_was_set(const struct sk_buff *skb) static inline unsigned char *skb_transport_header(const struct sk_buff *skb) { + DEBUG_NET_WARN_ON_ONCE(!skb_transport_header_was_set(skb)); return skb->head + skb->transport_header; } static inline void skb_reset_transport_header(struct sk_buff *skb) { - skb->transport_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->transport_header))offset); + skb->transport_header = offset; +} + +/** + * skb_reset_transport_header_careful - conditionally reset transport header + * @skb: buffer to alter + * + * Hardened version of skb_reset_transport_header(). + * + * Returns: true if the operation was a success. + */ +static inline bool __must_check +skb_reset_transport_header_careful(struct sk_buff *skb) +{ + long offset = skb->data - skb->head; + + if (unlikely(offset != (typeof(skb->transport_header))offset)) + return false; + + if (unlikely(offset == (typeof(skb->transport_header))~0U)) + return false; + + skb->transport_header = offset; + return true; } static inline void skb_set_transport_header(struct sk_buff *skb, @@ -1617,7 +3117,10 @@ static inline unsigned char *skb_network_header(const struct sk_buff *skb) static inline void skb_reset_network_header(struct sk_buff *skb) { - skb->network_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->network_header))offset); + skb->network_header = offset; } static inline void skb_set_network_header(struct sk_buff *skb, const int offset) @@ -1628,17 +3131,32 @@ static inline void skb_set_network_header(struct sk_buff *skb, const int offset) static inline unsigned char *skb_mac_header(const struct sk_buff *skb) { + DEBUG_NET_WARN_ON_ONCE(!skb_mac_header_was_set(skb)); return skb->head + skb->mac_header; } -static inline int skb_mac_header_was_set(const struct sk_buff *skb) +static inline int skb_mac_offset(const struct sk_buff *skb) { - return skb->mac_header != (typeof(skb->mac_header))~0U; + return skb_mac_header(skb) - skb->data; +} + +static inline u32 skb_mac_header_len(const struct sk_buff *skb) +{ + DEBUG_NET_WARN_ON_ONCE(!skb_mac_header_was_set(skb)); + return skb->network_header - skb->mac_header; +} + +static inline void skb_unset_mac_header(struct sk_buff *skb) +{ + skb->mac_header = (typeof(skb->mac_header))~0U; } static inline void skb_reset_mac_header(struct sk_buff *skb) { - skb->mac_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->mac_header))offset); + skb->mac_header = offset; } static inline void skb_set_mac_header(struct sk_buff *skb, const int offset) @@ -1647,17 +3165,21 @@ static inline void skb_set_mac_header(struct sk_buff *skb, const int offset) skb->mac_header += offset; } -static inline void skb_probe_transport_header(struct sk_buff *skb, - const int offset_hint) +static inline void skb_pop_mac_header(struct sk_buff *skb) { - struct flow_keys keys; + skb->mac_header = skb->network_header; +} + +static inline void skb_probe_transport_header(struct sk_buff *skb) +{ + struct flow_keys_basic keys; if (skb_transport_header_was_set(skb)) return; - else if (skb_flow_dissect(skb, &keys)) - skb_set_transport_header(skb, keys.thoff); - else - skb_set_transport_header(skb, offset_hint); + + if (skb_flow_dissect_flow_keys_basic(NULL, skb, &keys, + NULL, 0, 0, 0, 0)) + skb_set_transport_header(skb, keys.control.thoff); } static inline void skb_mac_header_rebuild(struct sk_buff *skb) @@ -1670,11 +3192,31 @@ static inline void skb_mac_header_rebuild(struct sk_buff *skb) } } +/* Move the full mac header up to current network_header. + * Leaves skb->data pointing at offset skb->mac_len into the mac_header. + * Must be provided the complete mac header length. + */ +static inline void skb_mac_header_rebuild_full(struct sk_buff *skb, u32 full_mac_len) +{ + if (skb_mac_header_was_set(skb)) { + const unsigned char *old_mac = skb_mac_header(skb); + + skb_set_mac_header(skb, -full_mac_len); + memmove(skb_mac_header(skb), old_mac, full_mac_len); + __skb_push(skb, full_mac_len - skb->mac_len); + } +} + static inline int skb_checksum_start_offset(const struct sk_buff *skb) { return skb->csum_start - skb_headroom(skb); } +static inline unsigned char *skb_checksum_start(const struct sk_buff *skb) +{ + return skb->head + skb->csum_start; +} + static inline int skb_transport_offset(const struct sk_buff *skb) { return skb_transport_header(skb) - skb->data; @@ -1682,6 +3224,7 @@ static inline int skb_transport_offset(const struct sk_buff *skb) static inline u32 skb_network_header_len(const struct sk_buff *skb) { + DEBUG_NET_WARN_ON_ONCE(!skb_transport_header_was_set(skb)); return skb->transport_header - skb->network_header; } @@ -1700,9 +3243,15 @@ static inline int skb_inner_network_offset(const struct sk_buff *skb) return skb_inner_network_header(skb) - skb->data; } +static inline enum skb_drop_reason +pskb_network_may_pull_reason(struct sk_buff *skb, unsigned int len) +{ + return pskb_may_pull_reason(skb, skb_network_offset(skb) + len); +} + static inline int pskb_network_may_pull(struct sk_buff *skb, unsigned int len) { - return pskb_may_pull(skb, skb_network_offset(skb) + len); + return pskb_network_may_pull_reason(skb, len) == SKB_NOT_DROPPED_YET; } /* @@ -1746,26 +3295,29 @@ static inline int pskb_network_may_pull(struct sk_buff *skb, unsigned int len) * * Using max(32, L1_CACHE_BYTES) makes sense (especially with RPS) * to reduce average number of cache lines per packet. - * get_rps_cpus() for example only access one 64 bytes aligned block : + * get_rps_cpu() for example only access one 64 bytes aligned block : * NET_IP_ALIGN(2) + ethernet_header(14) + IP_header(20/40) + ports(8) */ #ifndef NET_SKB_PAD #define NET_SKB_PAD max(32, L1_CACHE_BYTES) #endif -extern int ___pskb_trim(struct sk_buff *skb, unsigned int len); +int ___pskb_trim(struct sk_buff *skb, unsigned int len); -static inline void __skb_trim(struct sk_buff *skb, unsigned int len) +static inline void __skb_set_length(struct sk_buff *skb, unsigned int len) { - if (unlikely(skb_is_nonlinear(skb))) { - WARN_ON(1); + if (WARN_ON(skb_is_nonlinear(skb))) return; - } skb->len = len; skb_set_tail_pointer(skb, len); } -extern void skb_trim(struct sk_buff *skb, unsigned int len); +static inline void __skb_trim(struct sk_buff *skb, unsigned int len) +{ + __skb_set_length(skb, len); +} + +void skb_trim(struct sk_buff *skb, unsigned int len); static inline int __pskb_trim(struct sk_buff *skb, unsigned int len) { @@ -1777,6 +3329,7 @@ static inline int __pskb_trim(struct sk_buff *skb, unsigned int len) static inline int pskb_trim(struct sk_buff *skb, unsigned int len) { + skb_might_realloc(skb); return (len < skb->len) ? __pskb_trim(skb, len) : 0; } @@ -1795,6 +3348,20 @@ static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len) BUG_ON(err); } +static inline int __skb_grow(struct sk_buff *skb, unsigned int len) +{ + unsigned int diff = len - skb->len; + + if (skb_tailroom(skb) < diff) { + int ret = pskb_expand_head(skb, 0, diff - skb_tailroom(skb), + GFP_ATOMIC); + if (ret) + return ret; + } + __skb_set_length(skb, len); + return 0; +} + /** * skb_orphan - orphan a buffer * @skb: buffer to orphan @@ -1805,10 +3372,13 @@ static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len) */ static inline void skb_orphan(struct sk_buff *skb) { - if (skb->destructor) + if (skb->destructor) { skb->destructor(skb); - skb->destructor = NULL; - skb->sk = NULL; + skb->destructor = NULL; + skb->sk = NULL; + } else { + BUG_ON(skb->sk); + } } /** @@ -1822,36 +3392,78 @@ static inline void skb_orphan(struct sk_buff *skb) */ static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask) { - if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY))) + if (likely(!skb_zcopy(skb))) + return 0; + if (skb_shinfo(skb)->flags & SKBFL_DONT_ORPHAN) + return 0; + return skb_copy_ubufs(skb, gfp_mask); +} + +/* Frags must be orphaned, even if refcounted, if skb might loop to rx path */ +static inline int skb_orphan_frags_rx(struct sk_buff *skb, gfp_t gfp_mask) +{ + if (likely(!skb_zcopy(skb))) return 0; return skb_copy_ubufs(skb, gfp_mask); } /** - * __skb_queue_purge - empty a list + * __skb_queue_purge_reason - empty a list * @list: list to empty + * @reason: drop reason * * Delete all buffers on an &sk_buff list. Each buffer is removed from * the list and one reference dropped. This function does not take the * list lock and the caller must hold the relevant locks to use it. */ -extern void skb_queue_purge(struct sk_buff_head *list); -static inline void __skb_queue_purge(struct sk_buff_head *list) +static inline void __skb_queue_purge_reason(struct sk_buff_head *list, + enum skb_drop_reason reason) { struct sk_buff *skb; + while ((skb = __skb_dequeue(list)) != NULL) - kfree_skb(skb); + kfree_skb_reason(skb, reason); +} + +static inline void __skb_queue_purge(struct sk_buff_head *list) +{ + __skb_queue_purge_reason(list, SKB_DROP_REASON_QUEUE_PURGE); +} + +void skb_queue_purge_reason(struct sk_buff_head *list, + enum skb_drop_reason reason); + +static inline void skb_queue_purge(struct sk_buff_head *list) +{ + skb_queue_purge_reason(list, SKB_DROP_REASON_QUEUE_PURGE); } -#define NETDEV_FRAG_PAGE_MAX_ORDER get_order(32768) -#define NETDEV_FRAG_PAGE_MAX_SIZE (PAGE_SIZE << NETDEV_FRAG_PAGE_MAX_ORDER) -#define NETDEV_PAGECNT_MAX_BIAS NETDEV_FRAG_PAGE_MAX_SIZE +unsigned int skb_rbtree_purge(struct rb_root *root); +void skb_errqueue_purge(struct sk_buff_head *list); + +void *__netdev_alloc_frag_align(unsigned int fragsz, unsigned int align_mask); + +/** + * netdev_alloc_frag - allocate a page fragment + * @fragsz: fragment size + * + * Allocates a frag from a page for receive buffer. + * Uses GFP_ATOMIC allocations. + */ +static inline void *netdev_alloc_frag(unsigned int fragsz) +{ + return __netdev_alloc_frag_align(fragsz, ~0u); +} -extern void *netdev_alloc_frag(unsigned int fragsz); +static inline void *netdev_alloc_frag_align(unsigned int fragsz, + unsigned int align) +{ + WARN_ON_ONCE(!is_power_of_2(align)); + return __netdev_alloc_frag_align(fragsz, -align); +} -extern struct sk_buff *__netdev_alloc_skb(struct net_device *dev, - unsigned int length, - gfp_t gfp_mask); +struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int length, + gfp_t gfp_mask); /** * netdev_alloc_skb - allocate an skbuff for rx on a specific device @@ -1902,47 +3514,97 @@ static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev, return __netdev_alloc_skb_ip_align(dev, length, GFP_ATOMIC); } -/* - * __skb_alloc_page - allocate pages for ps-rx on a skb and preserve pfmemalloc data - * @gfp_mask: alloc_pages_node mask. Set __GFP_NOMEMALLOC if not for network packet RX - * @skb: skb to set pfmemalloc on if __GFP_MEMALLOC is used - * @order: size of the allocation +static inline void skb_free_frag(void *addr) +{ + page_frag_free(addr); +} + +void *__napi_alloc_frag_align(unsigned int fragsz, unsigned int align_mask); + +static inline void *napi_alloc_frag(unsigned int fragsz) +{ + return __napi_alloc_frag_align(fragsz, ~0u); +} + +static inline void *napi_alloc_frag_align(unsigned int fragsz, + unsigned int align) +{ + WARN_ON_ONCE(!is_power_of_2(align)); + return __napi_alloc_frag_align(fragsz, -align); +} + +struct sk_buff *napi_alloc_skb(struct napi_struct *napi, unsigned int length); +void napi_consume_skb(struct sk_buff *skb, int budget); + +void napi_skb_free_stolen_head(struct sk_buff *skb); +void __napi_kfree_skb(struct sk_buff *skb, enum skb_drop_reason reason); + +/** + * __dev_alloc_pages - allocate page for network Rx + * @gfp_mask: allocation priority. Set __GFP_NOMEMALLOC if not for network Rx + * @order: size of the allocation * - * Allocate a new page. + * Allocate a new page. * - * %NULL is returned if there is no free memory. + * %NULL is returned if there is no free memory. */ -static inline struct page *__skb_alloc_pages(gfp_t gfp_mask, - struct sk_buff *skb, - unsigned int order) -{ - struct page *page; - - gfp_mask |= __GFP_COLD; +static inline struct page *__dev_alloc_pages_noprof(gfp_t gfp_mask, + unsigned int order) +{ + /* This piece of code contains several assumptions. + * 1. This is for device Rx, therefore a cold page is preferred. + * 2. The expectation is the user wants a compound page. + * 3. If requesting a order 0 page it will not be compound + * due to the check to see if order has a value in prep_new_page + * 4. __GFP_MEMALLOC is ignored if __GFP_NOMEMALLOC is set due to + * code in gfp_to_alloc_flags that should be enforcing this. + */ + gfp_mask |= __GFP_COMP | __GFP_MEMALLOC; - if (!(gfp_mask & __GFP_NOMEMALLOC)) - gfp_mask |= __GFP_MEMALLOC; + return alloc_pages_node_noprof(NUMA_NO_NODE, gfp_mask, order); +} +#define __dev_alloc_pages(...) alloc_hooks(__dev_alloc_pages_noprof(__VA_ARGS__)) - page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, order); - if (skb && page && page->pfmemalloc) - skb->pfmemalloc = true; +/* + * This specialized allocator has to be a macro for its allocations to be + * accounted separately (to have a separate alloc_tag). + */ +#define dev_alloc_pages(_order) __dev_alloc_pages(GFP_ATOMIC | __GFP_NOWARN, _order) - return page; +/** + * __dev_alloc_page - allocate a page for network Rx + * @gfp_mask: allocation priority. Set __GFP_NOMEMALLOC if not for network Rx + * + * Allocate a new page. + * + * %NULL is returned if there is no free memory. + */ +static inline struct page *__dev_alloc_page_noprof(gfp_t gfp_mask) +{ + return __dev_alloc_pages_noprof(gfp_mask, 0); } +#define __dev_alloc_page(...) alloc_hooks(__dev_alloc_page_noprof(__VA_ARGS__)) + +/* + * This specialized allocator has to be a macro for its allocations to be + * accounted separately (to have a separate alloc_tag). + */ +#define dev_alloc_page() dev_alloc_pages(0) /** - * __skb_alloc_page - allocate a page for ps-rx for a given skb and preserve pfmemalloc data - * @gfp_mask: alloc_pages_node mask. Set __GFP_NOMEMALLOC if not for network packet RX - * @skb: skb to set pfmemalloc on if __GFP_MEMALLOC is used + * dev_page_is_reusable - check whether a page can be reused for network Rx + * @page: the page to test * - * Allocate a new page. + * A page shouldn't be considered for reusing/recycling if it was allocated + * under memory pressure or at a distant memory node. * - * %NULL is returned if there is no free memory. + * Returns: false if this page should be returned to page allocator, true + * otherwise. */ -static inline struct page *__skb_alloc_page(gfp_t gfp_mask, - struct sk_buff *skb) +static inline bool dev_page_is_reusable(const struct page *page) { - return __skb_alloc_pages(gfp_mask, skb, 0); + return likely(page_to_nid(page) == numa_mem_id() && + !page_is_pfmemalloc(page)); } /** @@ -1950,143 +3612,199 @@ static inline struct page *__skb_alloc_page(gfp_t gfp_mask, * @page: The page that was allocated from skb_alloc_page * @skb: The skb that may need pfmemalloc set */ -static inline void skb_propagate_pfmemalloc(struct page *page, - struct sk_buff *skb) +static inline void skb_propagate_pfmemalloc(const struct page *page, + struct sk_buff *skb) { - if (page && page->pfmemalloc) + if (page_is_pfmemalloc(page)) skb->pfmemalloc = true; } /** - * skb_frag_page - retrieve the page refered to by a paged fragment + * skb_frag_off() - Returns the offset of a skb fragment * @frag: the paged fragment - * - * Returns the &struct page associated with @frag. */ -static inline struct page *skb_frag_page(const skb_frag_t *frag) +static inline unsigned int skb_frag_off(const skb_frag_t *frag) { - return frag->page.p; + return frag->offset; } /** - * __skb_frag_ref - take an addition reference on a paged fragment. - * @frag: the paged fragment - * - * Takes an additional reference on the paged fragment @frag. + * skb_frag_off_add() - Increments the offset of a skb fragment by @delta + * @frag: skb fragment + * @delta: value to add + */ +static inline void skb_frag_off_add(skb_frag_t *frag, int delta) +{ + frag->offset += delta; +} + +/** + * skb_frag_off_set() - Sets the offset of a skb fragment + * @frag: skb fragment + * @offset: offset of fragment */ -static inline void __skb_frag_ref(skb_frag_t *frag) +static inline void skb_frag_off_set(skb_frag_t *frag, unsigned int offset) { - get_page(skb_frag_page(frag)); + frag->offset = offset; } /** - * skb_frag_ref - take an addition reference on a paged fragment of an skb. - * @skb: the buffer - * @f: the fragment offset. + * skb_frag_off_copy() - Sets the offset of a skb fragment from another fragment + * @fragto: skb fragment where offset is set + * @fragfrom: skb fragment offset is copied from + */ +static inline void skb_frag_off_copy(skb_frag_t *fragto, + const skb_frag_t *fragfrom) +{ + fragto->offset = fragfrom->offset; +} + +/* Return: true if the skb_frag contains a net_iov. */ +static inline bool skb_frag_is_net_iov(const skb_frag_t *frag) +{ + return netmem_is_net_iov(frag->netmem); +} + +/** + * skb_frag_net_iov - retrieve the net_iov referred to by fragment + * @frag: the fragment * - * Takes an additional reference on the @f'th paged fragment of @skb. + * Return: the &struct net_iov associated with @frag. Returns NULL if this + * frag has no associated net_iov. */ -static inline void skb_frag_ref(struct sk_buff *skb, int f) +static inline struct net_iov *skb_frag_net_iov(const skb_frag_t *frag) { - __skb_frag_ref(&skb_shinfo(skb)->frags[f]); + if (!skb_frag_is_net_iov(frag)) + return NULL; + + return netmem_to_net_iov(frag->netmem); } /** - * __skb_frag_unref - release a reference on a paged fragment. + * skb_frag_page - retrieve the page referred to by a paged fragment * @frag: the paged fragment * - * Releases a reference on the paged fragment @frag. + * Return: the &struct page associated with @frag. Returns NULL if this frag + * has no associated page. */ -static inline void __skb_frag_unref(skb_frag_t *frag) +static inline struct page *skb_frag_page(const skb_frag_t *frag) { - put_page(skb_frag_page(frag)); + if (skb_frag_is_net_iov(frag)) + return NULL; + + return netmem_to_page(frag->netmem); } /** - * skb_frag_unref - release a reference on a paged fragment of an skb. - * @skb: the buffer - * @f: the fragment offset + * skb_frag_netmem - retrieve the netmem referred to by a fragment + * @frag: the fragment * - * Releases a reference on the @f'th paged fragment of @skb. + * Return: the &netmem_ref associated with @frag. */ -static inline void skb_frag_unref(struct sk_buff *skb, int f) +static inline netmem_ref skb_frag_netmem(const skb_frag_t *frag) { - __skb_frag_unref(&skb_shinfo(skb)->frags[f]); + return frag->netmem; } +int skb_pp_cow_data(struct page_pool *pool, struct sk_buff **pskb, + unsigned int headroom); +int skb_cow_data_for_xdp(struct page_pool *pool, struct sk_buff **pskb, + const struct bpf_prog *prog); + /** * skb_frag_address - gets the address of the data contained in a paged fragment * @frag: the paged fragment buffer * - * Returns the address of the data within @frag. The page must already + * Returns: the address of the data within @frag. The page must already * be mapped. */ static inline void *skb_frag_address(const skb_frag_t *frag) { - return page_address(skb_frag_page(frag)) + frag->page_offset; + if (!skb_frag_page(frag)) + return NULL; + + return page_address(skb_frag_page(frag)) + skb_frag_off(frag); } /** * skb_frag_address_safe - gets the address of the data contained in a paged fragment * @frag: the paged fragment buffer * - * Returns the address of the data within @frag. Checks that the page + * Returns: the address of the data within @frag. Checks that the page * is mapped and returns %NULL otherwise. */ static inline void *skb_frag_address_safe(const skb_frag_t *frag) { - void *ptr = page_address(skb_frag_page(frag)); + struct page *page = skb_frag_page(frag); + void *ptr; + + if (!page) + return NULL; + + ptr = page_address(page); if (unlikely(!ptr)) return NULL; - return ptr + frag->page_offset; + return ptr + skb_frag_off(frag); } /** - * __skb_frag_set_page - sets the page contained in a paged fragment - * @frag: the paged fragment - * @page: the page to set - * - * Sets the fragment @frag to contain @page. + * skb_frag_page_copy() - sets the page in a fragment from another fragment + * @fragto: skb fragment where page is set + * @fragfrom: skb fragment page is copied from */ -static inline void __skb_frag_set_page(skb_frag_t *frag, struct page *page) +static inline void skb_frag_page_copy(skb_frag_t *fragto, + const skb_frag_t *fragfrom) { - frag->page.p = page; + fragto->netmem = fragfrom->netmem; } -/** - * skb_frag_set_page - sets the page contained in a paged fragment of an skb - * @skb: the buffer - * @f: the fragment offset - * @page: the page to set - * - * Sets the @f'th fragment of @skb to contain @page. - */ -static inline void skb_frag_set_page(struct sk_buff *skb, int f, - struct page *page) -{ - __skb_frag_set_page(&skb_shinfo(skb)->frags[f], page); -} +bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio); /** - * skb_frag_dma_map - maps a paged fragment via the DMA API + * __skb_frag_dma_map - maps a paged fragment via the DMA API * @dev: the device to map the fragment to * @frag: the paged fragment to map * @offset: the offset within the fragment (starting at the * fragment's own offset) * @size: the number of bytes to map - * @dir: the direction of the mapping (%PCI_DMA_*) + * @dir: the direction of the mapping (``PCI_DMA_*``) * * Maps the page associated with @frag to @device. */ -static inline dma_addr_t skb_frag_dma_map(struct device *dev, - const skb_frag_t *frag, - size_t offset, size_t size, - enum dma_data_direction dir) -{ +static inline dma_addr_t __skb_frag_dma_map(struct device *dev, + const skb_frag_t *frag, + size_t offset, size_t size, + enum dma_data_direction dir) +{ + if (skb_frag_is_net_iov(frag)) { + return netmem_to_net_iov(frag->netmem)->desc.dma_addr + + offset + frag->offset; + } return dma_map_page(dev, skb_frag_page(frag), - frag->page_offset + offset, size, dir); -} + skb_frag_off(frag) + offset, size, dir); +} + +#define skb_frag_dma_map(dev, frag, ...) \ + CONCATENATE(_skb_frag_dma_map, \ + COUNT_ARGS(__VA_ARGS__))(dev, frag, ##__VA_ARGS__) + +#define __skb_frag_dma_map1(dev, frag, offset, uf, uo) ({ \ + const skb_frag_t *uf = (frag); \ + size_t uo = (offset); \ + \ + __skb_frag_dma_map(dev, uf, uo, skb_frag_size(uf) - uo, \ + DMA_TO_DEVICE); \ +}) +#define _skb_frag_dma_map1(dev, frag, offset) \ + __skb_frag_dma_map1(dev, frag, offset, __UNIQUE_ID(frag_), \ + __UNIQUE_ID(offset_)) +#define _skb_frag_dma_map0(dev, frag) \ + _skb_frag_dma_map1(dev, frag, 0) +#define _skb_frag_dma_map2(dev, frag, offset, size) \ + __skb_frag_dma_map(dev, frag, offset, size, DMA_TO_DEVICE) +#define _skb_frag_dma_map3(dev, frag, offset, size, dir) \ + __skb_frag_dma_map(dev, frag, offset, size, dir) static inline struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask) @@ -2094,6 +3812,14 @@ static inline struct sk_buff *pskb_copy(struct sk_buff *skb, return __pskb_copy(skb, skb_headroom(skb), gfp_mask); } + +static inline struct sk_buff *pskb_copy_for_clone(struct sk_buff *skb, + gfp_t gfp_mask) +{ + return __pskb_copy_fclone(skb, skb_headroom(skb), gfp_mask, true); +} + + /** * skb_clone_writable - is the header of a clone writable * @skb: buffer to check @@ -2108,6 +3834,13 @@ static inline int skb_clone_writable(const struct sk_buff *skb, unsigned int len skb_headroom(skb) + len <= skb->hdr_len; } +static inline int skb_try_make_writable(struct sk_buff *skb, + unsigned int write_len) +{ + return skb_cloned(skb) && !skb_clone_writable(skb, write_len) && + pskb_expand_head(skb, 0, 0, GFP_ATOMIC); +} + static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom, int cloned) { @@ -2164,7 +3897,6 @@ static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom) * is untouched. Otherwise it is extended. Returns zero on * success. The skb is freed on error. */ - static inline int skb_padto(struct sk_buff *skb, unsigned int len) { unsigned int size = skb->len; @@ -2173,38 +3905,70 @@ static inline int skb_padto(struct sk_buff *skb, unsigned int len) return skb_pad(skb, len - size); } -static inline int skb_add_data(struct sk_buff *skb, - char __user *from, int copy) +/** + * __skb_put_padto - increase size and pad an skbuff up to a minimal size + * @skb: buffer to pad + * @len: minimal length + * @free_on_error: free buffer on error + * + * Pads up a buffer to ensure the trailing bytes exist and are + * blanked. If the buffer already contains sufficient data it + * is untouched. Otherwise it is extended. Returns zero on + * success. The skb is freed on error if @free_on_error is true. + */ +static inline int __must_check __skb_put_padto(struct sk_buff *skb, + unsigned int len, + bool free_on_error) { - const int off = skb->len; + unsigned int size = skb->len; - if (skb->ip_summed == CHECKSUM_NONE) { - int err = 0; - __wsum csum = csum_and_copy_from_user(from, skb_put(skb, copy), - copy, 0, &err); - if (!err) { - skb->csum = csum_block_add(skb->csum, csum, off); - return 0; - } - } else if (!copy_from_user(skb_put(skb, copy), from, copy)) - return 0; + if (unlikely(size < len)) { + len -= size; + if (__skb_pad(skb, len, free_on_error)) + return -ENOMEM; + __skb_put(skb, len); + } + return 0; +} - __skb_trim(skb, off); - return -EFAULT; +/** + * skb_put_padto - increase size and pad an skbuff up to a minimal size + * @skb: buffer to pad + * @len: minimal length + * + * Pads up a buffer to ensure the trailing bytes exist and are + * blanked. If the buffer already contains sufficient data it + * is untouched. Otherwise it is extended. Returns zero on + * success. The skb is freed on error. + */ +static inline int __must_check skb_put_padto(struct sk_buff *skb, unsigned int len) +{ + return __skb_put_padto(skb, len, true); } -static inline bool skb_can_coalesce(struct sk_buff *skb, int i, - const struct page *page, int off) +bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i) + __must_check; + +static inline bool skb_can_coalesce_netmem(struct sk_buff *skb, int i, + netmem_ref netmem, int off) { + if (skb_zcopy(skb)) + return false; if (i) { - const struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1]; + const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; - return page == skb_frag_page(frag) && - off == frag->page_offset + skb_frag_size(frag); + return netmem == skb_frag_netmem(frag) && + off == skb_frag_off(frag) + skb_frag_size(frag); } return false; } +static inline bool skb_can_coalesce(struct sk_buff *skb, int i, + const struct page *page, int off) +{ + return skb_can_coalesce_netmem(skb, i, page_to_netmem(page), off); +} + static inline int __skb_linearize(struct sk_buff *skb) { return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM; @@ -2226,13 +3990,13 @@ static inline int skb_linearize(struct sk_buff *skb) * skb_has_shared_frag - can any frag be overwritten * @skb: buffer to test * - * Return true if the skb has at least one frag that might be modified + * Return: true if the skb has at least one frag that might be modified * by an external entity (as in vmsplice()/sendfile()) */ static inline bool skb_has_shared_frag(const struct sk_buff *skb) { return skb_is_nonlinear(skb) && - skb_shinfo(skb)->tx_flags & SKBTX_SHARED_FRAG; + skb_shinfo(skb)->flags & SKBFL_SHARED_FRAG; } /** @@ -2248,6 +4012,18 @@ static inline int skb_linearize_cow(struct sk_buff *skb) __skb_linearize(skb) : 0; } +static __always_inline void +__skb_postpull_rcsum(struct sk_buff *skb, const void *start, unsigned int len, + unsigned int off) +{ + if (skb->ip_summed == CHECKSUM_COMPLETE) + skb->csum = csum_block_sub(skb->csum, + csum_partial(start, len, 0), off); + else if (skb->ip_summed == CHECKSUM_PARTIAL && + skb_checksum_start_offset(skb) < 0) + skb->ip_summed = CHECKSUM_NONE; +} + /** * skb_postpull_rcsum - update checksum for received skb after pull * @skb: buffer to update @@ -2258,34 +4034,101 @@ static inline int skb_linearize_cow(struct sk_buff *skb) * update the CHECKSUM_COMPLETE checksum, or set ip_summed to * CHECKSUM_NONE so that it can be recomputed from scratch. */ - static inline void skb_postpull_rcsum(struct sk_buff *skb, const void *start, unsigned int len) { if (skb->ip_summed == CHECKSUM_COMPLETE) - skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0)); + skb->csum = wsum_negate(csum_partial(start, len, + wsum_negate(skb->csum))); + else if (skb->ip_summed == CHECKSUM_PARTIAL && + skb_checksum_start_offset(skb) < 0) + skb->ip_summed = CHECKSUM_NONE; } -unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len); +static __always_inline void +__skb_postpush_rcsum(struct sk_buff *skb, const void *start, unsigned int len, + unsigned int off) +{ + if (skb->ip_summed == CHECKSUM_COMPLETE) + skb->csum = csum_block_add(skb->csum, + csum_partial(start, len, 0), off); +} /** + * skb_postpush_rcsum - update checksum for received skb after push + * @skb: buffer to update + * @start: start of data after push + * @len: length of data pushed + * + * After doing a push on a received packet, you need to call this to + * update the CHECKSUM_COMPLETE checksum. + */ +static inline void skb_postpush_rcsum(struct sk_buff *skb, + const void *start, unsigned int len) +{ + __skb_postpush_rcsum(skb, start, len, 0); +} + +void *skb_pull_rcsum(struct sk_buff *skb, unsigned int len); + +/** + * skb_push_rcsum - push skb and update receive checksum + * @skb: buffer to update + * @len: length of data pulled + * + * This function performs an skb_push on the packet and updates + * the CHECKSUM_COMPLETE checksum. It should be used on + * receive path processing instead of skb_push unless you know + * that the checksum difference is zero (e.g., a valid IP header) + * or you are setting ip_summed to CHECKSUM_NONE. + */ +static inline void *skb_push_rcsum(struct sk_buff *skb, unsigned int len) +{ + skb_push(skb, len); + skb_postpush_rcsum(skb, skb->data, len); + return skb->data; +} + +int pskb_trim_rcsum_slow(struct sk_buff *skb, unsigned int len); +/** * pskb_trim_rcsum - trim received skb and update checksum * @skb: buffer to trim * @len: new length * * This is exactly the same as pskb_trim except that it ensures the * checksum of received packets are still valid after the operation. + * It can change skb pointers. */ static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len) { + skb_might_realloc(skb); if (likely(len >= skb->len)) return 0; + return pskb_trim_rcsum_slow(skb, len); +} + +static inline int __skb_trim_rcsum(struct sk_buff *skb, unsigned int len) +{ + if (skb->ip_summed == CHECKSUM_COMPLETE) + skb->ip_summed = CHECKSUM_NONE; + __skb_trim(skb, len); + return 0; +} + +static inline int __skb_grow_rcsum(struct sk_buff *skb, unsigned int len) +{ if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; - return __pskb_trim(skb, len); + return __skb_grow(skb, len); } +#define rb_to_skb(rb) rb_entry_safe(rb, struct sk_buff, rbnode) +#define skb_rb_first(root) rb_to_skb(rb_first(root)) +#define skb_rb_last(root) rb_to_skb(rb_last(root)) +#define skb_rb_next(skb) rb_to_skb(rb_next(&(skb)->rbnode)) +#define skb_rb_prev(skb) rb_to_skb(rb_prev(&(skb)->rbnode)) + #define skb_queue_walk(queue, skb) \ for (skb = (queue)->next; \ skb != (struct sk_buff *)(queue); \ @@ -2300,6 +4143,18 @@ static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len) for (; skb != (struct sk_buff *)(queue); \ skb = skb->next) +#define skb_rbtree_walk(skb, root) \ + for (skb = skb_rb_first(root); skb != NULL; \ + skb = skb_rb_next(skb)) + +#define skb_rbtree_walk_from(skb) \ + for (; skb != NULL; \ + skb = skb_rb_next(skb)) + +#define skb_rbtree_walk_from_safe(skb, tmp) \ + for (; tmp = skb ? skb_rb_next(skb) : NULL, (skb != NULL); \ + skb = tmp) + #define skb_queue_walk_from_safe(queue, skb, tmp) \ for (tmp = skb->next; \ skb != (struct sk_buff *)(queue); \ @@ -2330,80 +4185,148 @@ static inline void skb_frag_list_init(struct sk_buff *skb) skb_shinfo(skb)->frag_list = NULL; } -static inline void skb_frag_add_head(struct sk_buff *skb, struct sk_buff *frag) -{ - frag->next = skb_shinfo(skb)->frag_list; - skb_shinfo(skb)->frag_list = frag; -} - #define skb_walk_frags(skb, iter) \ for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next) -extern struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags, - int *peeked, int *off, int *err); -extern struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, - int noblock, int *err); -extern unsigned int datagram_poll(struct file *file, struct socket *sock, - struct poll_table_struct *wait); -extern int skb_copy_datagram_iovec(const struct sk_buff *from, - int offset, struct iovec *to, - int size); -extern int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, - int hlen, - struct iovec *iov); -extern int skb_copy_datagram_from_iovec(struct sk_buff *skb, - int offset, - const struct iovec *from, - int from_offset, - int len); -extern int skb_copy_datagram_const_iovec(const struct sk_buff *from, - int offset, - const struct iovec *to, - int to_offset, - int size); -extern void skb_free_datagram(struct sock *sk, struct sk_buff *skb); -extern void skb_free_datagram_locked(struct sock *sk, - struct sk_buff *skb); -extern int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, - unsigned int flags); -extern __wsum skb_checksum(const struct sk_buff *skb, int offset, - int len, __wsum csum); -extern int skb_copy_bits(const struct sk_buff *skb, int offset, - void *to, int len); -extern int skb_store_bits(struct sk_buff *skb, int offset, - const void *from, int len); -extern __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, - int offset, u8 *to, int len, - __wsum csum); -extern int skb_splice_bits(struct sk_buff *skb, - unsigned int offset, - struct pipe_inode_info *pipe, - unsigned int len, - unsigned int flags); -extern void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to); -extern void skb_split(struct sk_buff *skb, - struct sk_buff *skb1, const u32 len); -extern int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, - int shiftlen); -extern void skb_scrub_packet(struct sk_buff *skb); - -extern struct sk_buff *skb_segment(struct sk_buff *skb, - netdev_features_t features); - -static inline void *skb_header_pointer(const struct sk_buff *skb, int offset, - int len, void *buffer) -{ - int hlen = skb_headlen(skb); - - if (hlen - offset >= len) - return skb->data + offset; - if (skb_copy_bits(skb, offset, buffer, len) < 0) +int __skb_wait_for_more_packets(struct sock *sk, struct sk_buff_head *queue, + int *err, long *timeo_p, + const struct sk_buff *skb); +struct sk_buff *__skb_try_recv_from_queue(struct sk_buff_head *queue, + unsigned int flags, + int *off, int *err, + struct sk_buff **last); +struct sk_buff *__skb_try_recv_datagram(struct sock *sk, + struct sk_buff_head *queue, + unsigned int flags, int *off, int *err, + struct sk_buff **last); +struct sk_buff *__skb_recv_datagram(struct sock *sk, + struct sk_buff_head *sk_queue, + unsigned int flags, int *off, int *err); +struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned int flags, int *err); +__poll_t datagram_poll_queue(struct file *file, struct socket *sock, + struct poll_table_struct *wait, + struct sk_buff_head *rcv_queue); +__poll_t datagram_poll(struct file *file, struct socket *sock, + struct poll_table_struct *wait); +int skb_copy_datagram_iter(const struct sk_buff *from, int offset, + struct iov_iter *to, int size); +static inline int skb_copy_datagram_msg(const struct sk_buff *from, int offset, + struct msghdr *msg, int size) +{ + return skb_copy_datagram_iter(from, offset, &msg->msg_iter, size); +} +int skb_copy_and_csum_datagram_msg(struct sk_buff *skb, int hlen, + struct msghdr *msg); +int skb_copy_and_crc32c_datagram_iter(const struct sk_buff *skb, int offset, + struct iov_iter *to, int len, u32 *crcp); +int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset, + struct iov_iter *from, int len); +int skb_copy_datagram_from_iter_full(struct sk_buff *skb, int offset, + struct iov_iter *from, int len); +int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *frm); +void skb_free_datagram(struct sock *sk, struct sk_buff *skb); +int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags); +int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len); +int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len); +__wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset, u8 *to, + int len); +int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset, + struct pipe_inode_info *pipe, unsigned int len, + unsigned int flags); +int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset, + int len); +int skb_send_sock_locked_with_flags(struct sock *sk, struct sk_buff *skb, + int offset, int len, int flags); +int skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset, int len); +void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to); +unsigned int skb_zerocopy_headlen(const struct sk_buff *from); +int skb_zerocopy(struct sk_buff *to, struct sk_buff *from, + int len, int hlen); +void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len); +int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen); +void skb_scrub_packet(struct sk_buff *skb, bool xnet); +struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features); +struct sk_buff *skb_segment_list(struct sk_buff *skb, netdev_features_t features, + unsigned int offset); +struct sk_buff *skb_vlan_untag(struct sk_buff *skb); +int skb_ensure_writable(struct sk_buff *skb, unsigned int write_len); +int skb_ensure_writable_head_tail(struct sk_buff *skb, struct net_device *dev); +int __skb_vlan_pop(struct sk_buff *skb, u16 *vlan_tci); +int skb_vlan_pop(struct sk_buff *skb); +int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci); +int skb_eth_pop(struct sk_buff *skb); +int skb_eth_push(struct sk_buff *skb, const unsigned char *dst, + const unsigned char *src); +int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto, + int mac_len, bool ethernet); +int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len, + bool ethernet); +int skb_mpls_update_lse(struct sk_buff *skb, __be32 mpls_lse); +int skb_mpls_dec_ttl(struct sk_buff *skb); +struct sk_buff *pskb_extract(struct sk_buff *skb, int off, int to_copy, + gfp_t gfp); + +static inline int memcpy_from_msg(void *data, struct msghdr *msg, int len) +{ + return copy_from_iter_full(data, len, &msg->msg_iter) ? 0 : -EFAULT; +} + +static inline int memcpy_to_msg(struct msghdr *msg, void *data, int len) +{ + return copy_to_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT; +} + +__wsum skb_checksum(const struct sk_buff *skb, int offset, int len, + __wsum csum); +u32 skb_crc32c(const struct sk_buff *skb, int offset, int len, u32 crc); + +static inline void * __must_check +__skb_header_pointer(const struct sk_buff *skb, int offset, int len, + const void *data, int hlen, void *buffer) +{ + if (likely(hlen - offset >= len)) + return (void *)data + offset; + + if (!skb || unlikely(skb_copy_bits(skb, offset, buffer, len) < 0)) return NULL; return buffer; } +static inline void * __must_check +skb_header_pointer(const struct sk_buff *skb, int offset, int len, void *buffer) +{ + return __skb_header_pointer(skb, offset, len, skb->data, + skb_headlen(skb), buffer); +} + +static inline void * __must_check +skb_pointer_if_linear(const struct sk_buff *skb, int offset, int len) +{ + if (likely(skb_headlen(skb) - offset >= len)) + return skb->data + offset; + return NULL; +} + +/** + * skb_needs_linearize - check if we need to linearize a given skb + * depending on the given device features. + * @skb: socket buffer to check + * @features: net device features + * + * Returns true if either: + * 1. skb has frag_list and the device doesn't support FRAGLIST, or + * 2. skb is fragmented and the device does not support SG. + */ +static inline bool skb_needs_linearize(struct sk_buff *skb, + netdev_features_t features) +{ + return skb_is_nonlinear(skb) && + ((skb_has_frag_list(skb) && !(features & NETIF_F_FRAGLIST)) || + (skb_shinfo(skb)->nr_frags && !(features & NETIF_F_SG))); +} + static inline void skb_copy_from_linear_data(const struct sk_buff *skb, void *to, const unsigned int len) @@ -2433,7 +4356,7 @@ static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb, memcpy(skb->data + offset, from, len); } -extern void skb_init(void); +void skb_init(void); static inline ktime_t skb_get_ktime(const struct sk_buff *skb) { @@ -2443,27 +4366,49 @@ static inline ktime_t skb_get_ktime(const struct sk_buff *skb) /** * skb_get_timestamp - get timestamp from a skb * @skb: skb to get stamp from - * @stamp: pointer to struct timeval to store stamp in + * @stamp: pointer to struct __kernel_old_timeval to store stamp in * * Timestamps are stored in the skb as offsets to a base timestamp. * This function converts the offset back to a struct timeval and stores * it in stamp. */ static inline void skb_get_timestamp(const struct sk_buff *skb, - struct timeval *stamp) + struct __kernel_old_timeval *stamp) { - *stamp = ktime_to_timeval(skb->tstamp); + *stamp = ns_to_kernel_old_timeval(skb->tstamp); +} + +static inline void skb_get_new_timestamp(const struct sk_buff *skb, + struct __kernel_sock_timeval *stamp) +{ + struct timespec64 ts = ktime_to_timespec64(skb->tstamp); + + stamp->tv_sec = ts.tv_sec; + stamp->tv_usec = ts.tv_nsec / 1000; } static inline void skb_get_timestampns(const struct sk_buff *skb, - struct timespec *stamp) + struct __kernel_old_timespec *stamp) { - *stamp = ktime_to_timespec(skb->tstamp); + struct timespec64 ts = ktime_to_timespec64(skb->tstamp); + + stamp->tv_sec = ts.tv_sec; + stamp->tv_nsec = ts.tv_nsec; +} + +static inline void skb_get_new_timestampns(const struct sk_buff *skb, + struct __kernel_timespec *stamp) +{ + struct timespec64 ts = ktime_to_timespec64(skb->tstamp); + + stamp->tv_sec = ts.tv_sec; + stamp->tv_nsec = ts.tv_nsec; } static inline void __net_timestamp(struct sk_buff *skb) { skb->tstamp = ktime_get_real(); + skb->tstamp_type = SKB_CLOCK_REALTIME; } static inline ktime_t net_timedelta(ktime_t t) @@ -2471,17 +4416,235 @@ static inline ktime_t net_timedelta(ktime_t t) return ktime_sub(ktime_get_real(), t); } -static inline ktime_t net_invalid_timestamp(void) +static inline void skb_set_delivery_time(struct sk_buff *skb, ktime_t kt, + u8 tstamp_type) +{ + skb->tstamp = kt; + + if (kt) + skb->tstamp_type = tstamp_type; + else + skb->tstamp_type = SKB_CLOCK_REALTIME; +} + +static inline void skb_set_delivery_type_by_clockid(struct sk_buff *skb, + ktime_t kt, clockid_t clockid) +{ + u8 tstamp_type = SKB_CLOCK_REALTIME; + + switch (clockid) { + case CLOCK_REALTIME: + break; + case CLOCK_MONOTONIC: + tstamp_type = SKB_CLOCK_MONOTONIC; + break; + case CLOCK_TAI: + tstamp_type = SKB_CLOCK_TAI; + break; + default: + WARN_ON_ONCE(1); + kt = 0; + } + + skb_set_delivery_time(skb, kt, tstamp_type); +} + +DECLARE_STATIC_KEY_FALSE(netstamp_needed_key); + +/* It is used in the ingress path to clear the delivery_time. + * If needed, set the skb->tstamp to the (rcv) timestamp. + */ +static inline void skb_clear_delivery_time(struct sk_buff *skb) +{ + if (skb->tstamp_type) { + skb->tstamp_type = SKB_CLOCK_REALTIME; + if (static_branch_unlikely(&netstamp_needed_key)) + skb->tstamp = ktime_get_real(); + else + skb->tstamp = 0; + } +} + +static inline void skb_clear_tstamp(struct sk_buff *skb) +{ + if (skb->tstamp_type) + return; + + skb->tstamp = 0; +} + +static inline ktime_t skb_tstamp(const struct sk_buff *skb) +{ + if (skb->tstamp_type) + return 0; + + return skb->tstamp; +} + +static inline ktime_t skb_tstamp_cond(const struct sk_buff *skb, bool cond) +{ + if (skb->tstamp_type != SKB_CLOCK_MONOTONIC && skb->tstamp) + return skb->tstamp; + + if (static_branch_unlikely(&netstamp_needed_key) || cond) + return ktime_get_real(); + + return 0; +} + +static inline u8 skb_metadata_len(const struct sk_buff *skb) +{ + return skb_shinfo(skb)->meta_len; +} + +static inline void *skb_metadata_end(const struct sk_buff *skb) +{ + return skb_mac_header(skb); +} + +static inline bool __skb_metadata_differs(const struct sk_buff *skb_a, + const struct sk_buff *skb_b, + u8 meta_len) +{ + const void *a = skb_metadata_end(skb_a); + const void *b = skb_metadata_end(skb_b); + u64 diffs = 0; + + if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || + BITS_PER_LONG != 64) + goto slow; + + /* Using more efficient variant than plain call to memcmp(). */ + switch (meta_len) { +#define __it(x, op) (x -= sizeof(u##op)) +#define __it_diff(a, b, op) (*(u##op *)__it(a, op)) ^ (*(u##op *)__it(b, op)) + case 32: diffs |= __it_diff(a, b, 64); + fallthrough; + case 24: diffs |= __it_diff(a, b, 64); + fallthrough; + case 16: diffs |= __it_diff(a, b, 64); + fallthrough; + case 8: diffs |= __it_diff(a, b, 64); + break; + case 28: diffs |= __it_diff(a, b, 64); + fallthrough; + case 20: diffs |= __it_diff(a, b, 64); + fallthrough; + case 12: diffs |= __it_diff(a, b, 64); + fallthrough; + case 4: diffs |= __it_diff(a, b, 32); + break; + default: +slow: + return memcmp(a - meta_len, b - meta_len, meta_len); + } + return diffs; +} + +static inline bool skb_metadata_differs(const struct sk_buff *skb_a, + const struct sk_buff *skb_b) +{ + u8 len_a = skb_metadata_len(skb_a); + u8 len_b = skb_metadata_len(skb_b); + + if (!(len_a | len_b)) + return false; + + return len_a != len_b ? + true : __skb_metadata_differs(skb_a, skb_b, len_a); +} + +static inline void skb_metadata_set(struct sk_buff *skb, u8 meta_len) +{ + skb_shinfo(skb)->meta_len = meta_len; +} + +static inline void skb_metadata_clear(struct sk_buff *skb) +{ + skb_metadata_set(skb, 0); +} + +/** + * skb_data_move - Move packet data and metadata after skb_push() or skb_pull(). + * @skb: packet to operate on + * @len: number of bytes pushed or pulled from &sk_buff->data + * @n: number of bytes to memmove() from pre-push/pull &sk_buff->data + * + * Moves @n bytes of packet data, can be zero, and all bytes of skb metadata. + * + * Assumes metadata is located immediately before &sk_buff->data prior to the + * push/pull, and that sufficient headroom exists to hold it after an + * skb_push(). Otherwise, metadata is cleared and a one-time warning is issued. + * + * Prefer skb_postpull_data_move() or skb_postpush_data_move() to calling this + * helper directly. + */ +static inline void skb_data_move(struct sk_buff *skb, const int len, + const unsigned int n) +{ + const u8 meta_len = skb_metadata_len(skb); + u8 *meta, *meta_end; + + if (!len || (!n && !meta_len)) + return; + + if (!meta_len) + goto no_metadata; + + meta_end = skb_metadata_end(skb); + meta = meta_end - meta_len; + + if (WARN_ON_ONCE(meta_end + len != skb->data || + meta_len > skb_headroom(skb))) { + skb_metadata_clear(skb); + goto no_metadata; + } + + memmove(meta + len, meta, meta_len + n); + return; + +no_metadata: + memmove(skb->data, skb->data - len, n); +} + +/** + * skb_postpull_data_move - Move packet data and metadata after skb_pull(). + * @skb: packet to operate on + * @len: number of bytes pulled from &sk_buff->data + * @n: number of bytes to memmove() from pre-pull &sk_buff->data + * + * See skb_data_move() for details. + */ +static inline void skb_postpull_data_move(struct sk_buff *skb, + const unsigned int len, + const unsigned int n) { - return ktime_set(0, 0); + DEBUG_NET_WARN_ON_ONCE(len > INT_MAX); + skb_data_move(skb, len, n); } -extern void skb_timestamping_init(void); +/** + * skb_postpush_data_move - Move packet data and metadata after skb_push(). + * @skb: packet to operate on + * @len: number of bytes pushed onto &sk_buff->data + * @n: number of bytes to memmove() from pre-push &sk_buff->data + * + * See skb_data_move() for details. + */ +static inline void skb_postpush_data_move(struct sk_buff *skb, + const unsigned int len, + const unsigned int n) +{ + DEBUG_NET_WARN_ON_ONCE(len > INT_MAX); + skb_data_move(skb, -len, n); +} + +struct sk_buff *skb_clone_sk(struct sk_buff *skb); #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING -extern void skb_clone_tx_timestamp(struct sk_buff *skb); -extern bool skb_defer_rx_timestamp(struct sk_buff *skb); +void skb_clone_tx_timestamp(struct sk_buff *skb); +bool skb_defer_rx_timestamp(struct sk_buff *skb); #else /* CONFIG_NETWORK_PHY_TIMESTAMPING */ @@ -2501,16 +4664,20 @@ static inline bool skb_defer_rx_timestamp(struct sk_buff *skb) * * PHY drivers may accept clones of transmitted packets for * timestamping via their phy_driver.txtstamp method. These drivers - * must call this function to return the skb back to the stack, with - * or without a timestamp. + * must call this function to return the skb back to the stack with a + * timestamp. * - * @skb: clone of the the original outgoing packet - * @hwtstamps: hardware time stamps, may be NULL if not available + * @skb: clone of the original outgoing packet + * @hwtstamps: hardware time stamps * */ void skb_complete_tx_timestamp(struct sk_buff *skb, struct skb_shared_hwtstamps *hwtstamps); +void __skb_tstamp_tx(struct sk_buff *orig_skb, const struct sk_buff *ack_skb, + struct skb_shared_hwtstamps *hwtstamps, + struct sock *sk, int tstype); + /** * skb_tstamp_tx - queue clone of skb with send time stamps * @orig_skb: the original outgoing packet @@ -2522,15 +4689,8 @@ void skb_complete_tx_timestamp(struct sk_buff *skb, * generates a software time stamp (otherwise), then queues the clone * to the error queue of the socket. Errors are silently ignored. */ -extern void skb_tstamp_tx(struct sk_buff *orig_skb, - struct skb_shared_hwtstamps *hwtstamps); - -static inline void sw_tx_timestamp(struct sk_buff *skb) -{ - if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP && - !(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) - skb_tstamp_tx(skb, NULL); -} +void skb_tstamp_tx(struct sk_buff *orig_skb, + struct skb_shared_hwtstamps *hwtstamps); /** * skb_tx_timestamp() - Driver hook for transmit timestamping @@ -2538,12 +4698,17 @@ static inline void sw_tx_timestamp(struct sk_buff *skb) * Ethernet MAC Drivers should call this function in their hard_xmit() * function immediately before giving the sk_buff to the MAC hardware. * + * Specifically, one should make absolutely sure that this function is + * called before TX completion of this packet can trigger. Otherwise + * the packet could potentially already be freed. + * * @skb: A socket buffer. */ static inline void skb_tx_timestamp(struct sk_buff *skb) { skb_clone_tx_timestamp(skb); - sw_tx_timestamp(skb); + if (skb_shinfo(skb)->tx_flags & (SKBTX_SW_TSTAMP | SKBTX_BPF)) + skb_tstamp_tx(skb, NULL); } /** @@ -2555,12 +4720,15 @@ static inline void skb_tx_timestamp(struct sk_buff *skb) */ void skb_complete_wifi_ack(struct sk_buff *skb, bool acked); -extern __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len); -extern __sum16 __skb_checksum_complete(struct sk_buff *skb); +__sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len); +__sum16 __skb_checksum_complete(struct sk_buff *skb); static inline int skb_csum_unnecessary(const struct sk_buff *skb) { - return skb->ip_summed & CHECKSUM_UNNECESSARY; + return ((skb->ip_summed == CHECKSUM_UNNECESSARY) || + skb->csum_valid || + (skb->ip_summed == CHECKSUM_PARTIAL && + skb_checksum_start_offset(skb) >= 0)); } /** @@ -2585,96 +4753,385 @@ static inline __sum16 skb_checksum_complete(struct sk_buff *skb) 0 : __skb_checksum_complete(skb); } -#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) -extern void nf_conntrack_destroy(struct nf_conntrack *nfct); -static inline void nf_conntrack_put(struct nf_conntrack *nfct) +static inline void __skb_decr_checksum_unnecessary(struct sk_buff *skb) +{ + if (skb->ip_summed == CHECKSUM_UNNECESSARY) { + if (skb->csum_level == 0) + skb->ip_summed = CHECKSUM_NONE; + else + skb->csum_level--; + } +} + +static inline void __skb_incr_checksum_unnecessary(struct sk_buff *skb) +{ + if (skb->ip_summed == CHECKSUM_UNNECESSARY) { + if (skb->csum_level < SKB_MAX_CSUM_LEVEL) + skb->csum_level++; + } else if (skb->ip_summed == CHECKSUM_NONE) { + skb->ip_summed = CHECKSUM_UNNECESSARY; + skb->csum_level = 0; + } +} + +static inline void __skb_reset_checksum_unnecessary(struct sk_buff *skb) +{ + if (skb->ip_summed == CHECKSUM_UNNECESSARY) { + skb->ip_summed = CHECKSUM_NONE; + skb->csum_level = 0; + } +} + +/* Check if we need to perform checksum complete validation. + * + * Returns: true if checksum complete is needed, false otherwise + * (either checksum is unnecessary or zero checksum is allowed). + */ +static inline bool __skb_checksum_validate_needed(struct sk_buff *skb, + bool zero_okay, + __sum16 check) +{ + if (skb_csum_unnecessary(skb) || (zero_okay && !check)) { + skb->csum_valid = 1; + __skb_decr_checksum_unnecessary(skb); + return false; + } + + return true; +} + +/* For small packets <= CHECKSUM_BREAK perform checksum complete directly + * in checksum_init. + */ +#define CHECKSUM_BREAK 76 + +/* Unset checksum-complete + * + * Unset checksum complete can be done when packet is being modified + * (uncompressed for instance) and checksum-complete value is + * invalidated. + */ +static inline void skb_checksum_complete_unset(struct sk_buff *skb) +{ + if (skb->ip_summed == CHECKSUM_COMPLETE) + skb->ip_summed = CHECKSUM_NONE; +} + +/* Validate (init) checksum based on checksum complete. + * + * Return values: + * 0: checksum is validated or try to in skb_checksum_complete. In the latter + * case the ip_summed will not be CHECKSUM_UNNECESSARY and the pseudo + * checksum is stored in skb->csum for use in __skb_checksum_complete + * non-zero: value of invalid checksum + * + */ +static inline __sum16 __skb_checksum_validate_complete(struct sk_buff *skb, + bool complete, + __wsum psum) +{ + if (skb->ip_summed == CHECKSUM_COMPLETE) { + if (!csum_fold(csum_add(psum, skb->csum))) { + skb->csum_valid = 1; + return 0; + } + } + + skb->csum = psum; + + if (complete || skb->len <= CHECKSUM_BREAK) { + __sum16 csum; + + csum = __skb_checksum_complete(skb); + skb->csum_valid = !csum; + return csum; + } + + return 0; +} + +static inline __wsum null_compute_pseudo(struct sk_buff *skb, int proto) +{ + return 0; +} + +/* Perform checksum validate (init). Note that this is a macro since we only + * want to calculate the pseudo header which is an input function if necessary. + * First we try to validate without any computation (checksum unnecessary) and + * then calculate based on checksum complete calling the function to compute + * pseudo header. + * + * Return values: + * 0: checksum is validated or try to in skb_checksum_complete + * non-zero: value of invalid checksum + */ +#define __skb_checksum_validate(skb, proto, complete, \ + zero_okay, check, compute_pseudo) \ +({ \ + __sum16 __ret = 0; \ + skb->csum_valid = 0; \ + if (__skb_checksum_validate_needed(skb, zero_okay, check)) \ + __ret = __skb_checksum_validate_complete(skb, \ + complete, compute_pseudo(skb, proto)); \ + __ret; \ +}) + +#define skb_checksum_init(skb, proto, compute_pseudo) \ + __skb_checksum_validate(skb, proto, false, false, 0, compute_pseudo) + +#define skb_checksum_init_zero_check(skb, proto, check, compute_pseudo) \ + __skb_checksum_validate(skb, proto, false, true, check, compute_pseudo) + +#define skb_checksum_validate(skb, proto, compute_pseudo) \ + __skb_checksum_validate(skb, proto, true, false, 0, compute_pseudo) + +#define skb_checksum_validate_zero_check(skb, proto, check, \ + compute_pseudo) \ + __skb_checksum_validate(skb, proto, true, true, check, compute_pseudo) + +#define skb_checksum_simple_validate(skb) \ + __skb_checksum_validate(skb, 0, true, false, 0, null_compute_pseudo) + +static inline bool __skb_checksum_convert_check(struct sk_buff *skb) +{ + return (skb->ip_summed == CHECKSUM_NONE && skb->csum_valid); +} + +static inline void __skb_checksum_convert(struct sk_buff *skb, __wsum pseudo) +{ + skb->csum = ~pseudo; + skb->ip_summed = CHECKSUM_COMPLETE; +} + +#define skb_checksum_try_convert(skb, proto, compute_pseudo) \ +do { \ + if (__skb_checksum_convert_check(skb)) \ + __skb_checksum_convert(skb, compute_pseudo(skb, proto)); \ +} while (0) + +static inline void skb_remcsum_adjust_partial(struct sk_buff *skb, void *ptr, + u16 start, u16 offset) { - if (nfct && atomic_dec_and_test(&nfct->use)) - nf_conntrack_destroy(nfct); + skb->ip_summed = CHECKSUM_PARTIAL; + skb->csum_start = ((unsigned char *)ptr + start) - skb->head; + skb->csum_offset = offset - start; } -static inline void nf_conntrack_get(struct nf_conntrack *nfct) + +/* Update skbuf and packet to reflect the remote checksum offload operation. + * When called, ptr indicates the starting point for skb->csum when + * ip_summed is CHECKSUM_COMPLETE. If we need create checksum complete + * here, skb_postpull_rcsum is done so skb->csum start is ptr. + */ +static inline void skb_remcsum_process(struct sk_buff *skb, void *ptr, + int start, int offset, bool nopartial) { - if (nfct) - atomic_inc(&nfct->use); + __wsum delta; + + if (!nopartial) { + skb_remcsum_adjust_partial(skb, ptr, start, offset); + return; + } + + if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE)) { + __skb_checksum_complete(skb); + skb_postpull_rcsum(skb, skb->data, ptr - (void *)skb->data); + } + + delta = remcsum_adjust(ptr, skb->csum, start, offset); + + /* Adjust skb->csum since we changed the packet */ + skb->csum = csum_add(skb->csum, delta); } + +static inline struct nf_conntrack *skb_nfct(const struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_NF_CONNTRACK) + return (void *)(skb->_nfct & NFCT_PTRMASK); +#else + return NULL; #endif -#ifdef NET_SKBUFF_NF_DEFRAG_NEEDED -static inline void nf_conntrack_get_reasm(struct sk_buff *skb) +} + +static inline unsigned long skb_get_nfct(const struct sk_buff *skb) { - if (skb) - atomic_inc(&skb->users); +#if IS_ENABLED(CONFIG_NF_CONNTRACK) + return skb->_nfct; +#else + return 0UL; +#endif } -static inline void nf_conntrack_put_reasm(struct sk_buff *skb) + +static inline void skb_set_nfct(struct sk_buff *skb, unsigned long nfct) { - if (skb) - kfree_skb(skb); +#if IS_ENABLED(CONFIG_NF_CONNTRACK) + skb->slow_gro |= !!nfct; + skb->_nfct = nfct; +#endif } + +#ifdef CONFIG_SKB_EXTENSIONS +enum skb_ext_id { +#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) + SKB_EXT_BRIDGE_NF, +#endif +#ifdef CONFIG_XFRM + SKB_EXT_SEC_PATH, +#endif +#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT) + TC_SKB_EXT, +#endif +#if IS_ENABLED(CONFIG_MPTCP) + SKB_EXT_MPTCP, #endif -#ifdef CONFIG_BRIDGE_NETFILTER -static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge) +#if IS_ENABLED(CONFIG_MCTP_FLOWS) + SKB_EXT_MCTP, +#endif +#if IS_ENABLED(CONFIG_INET_PSP) + SKB_EXT_PSP, +#endif + SKB_EXT_NUM, /* must be last */ +}; + +/** + * struct skb_ext - sk_buff extensions + * @refcnt: 1 on allocation, deallocated on 0 + * @offset: offset to add to @data to obtain extension address + * @chunks: size currently allocated, stored in SKB_EXT_ALIGN_SHIFT units + * @data: start of extension data, variable sized + * + * Note: offsets/lengths are stored in chunks of 8 bytes, this allows + * to use 'u8' types while allowing up to 2kb worth of extension data. + */ +struct skb_ext { + refcount_t refcnt; + u8 offset[SKB_EXT_NUM]; /* in chunks of 8 bytes */ + u8 chunks; /* same */ + char data[] __aligned(8); +}; + +struct skb_ext *__skb_ext_alloc(gfp_t flags); +void *__skb_ext_set(struct sk_buff *skb, enum skb_ext_id id, + struct skb_ext *ext); +void *skb_ext_add(struct sk_buff *skb, enum skb_ext_id id); +void __skb_ext_del(struct sk_buff *skb, enum skb_ext_id id); +void __skb_ext_put(struct skb_ext *ext); + +static inline void skb_ext_put(struct sk_buff *skb) { - if (nf_bridge && atomic_dec_and_test(&nf_bridge->use)) - kfree(nf_bridge); + if (skb->active_extensions) + __skb_ext_put(skb->extensions); } -static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge) + +static inline void __skb_ext_copy(struct sk_buff *dst, + const struct sk_buff *src) { - if (nf_bridge) - atomic_inc(&nf_bridge->use); + dst->active_extensions = src->active_extensions; + + if (src->active_extensions) { + struct skb_ext *ext = src->extensions; + + refcount_inc(&ext->refcnt); + dst->extensions = ext; + } } -#endif /* CONFIG_BRIDGE_NETFILTER */ -static inline void nf_reset(struct sk_buff *skb) + +static inline void skb_ext_copy(struct sk_buff *dst, const struct sk_buff *src) +{ + skb_ext_put(dst); + __skb_ext_copy(dst, src); +} + +static inline bool __skb_ext_exist(const struct skb_ext *ext, enum skb_ext_id i) +{ + return !!ext->offset[i]; +} + +static inline bool skb_ext_exist(const struct sk_buff *skb, enum skb_ext_id id) +{ + return skb->active_extensions & (1 << id); +} + +static inline void skb_ext_del(struct sk_buff *skb, enum skb_ext_id id) +{ + if (skb_ext_exist(skb, id)) + __skb_ext_del(skb, id); +} + +static inline void *skb_ext_find(const struct sk_buff *skb, enum skb_ext_id id) +{ + if (skb_ext_exist(skb, id)) { + struct skb_ext *ext = skb->extensions; + + return (void *)ext + (ext->offset[id] << 3); + } + + return NULL; +} + +static inline void skb_ext_reset(struct sk_buff *skb) +{ + if (unlikely(skb->active_extensions)) { + __skb_ext_put(skb->extensions); + skb->active_extensions = 0; + } +} + +static inline bool skb_has_extensions(struct sk_buff *skb) +{ + return unlikely(skb->active_extensions); +} +#else +static inline void skb_ext_put(struct sk_buff *skb) {} +static inline void skb_ext_reset(struct sk_buff *skb) {} +static inline void skb_ext_del(struct sk_buff *skb, int unused) {} +static inline void __skb_ext_copy(struct sk_buff *d, const struct sk_buff *s) {} +static inline void skb_ext_copy(struct sk_buff *dst, const struct sk_buff *s) {} +static inline bool skb_has_extensions(struct sk_buff *skb) { return false; } +#endif /* CONFIG_SKB_EXTENSIONS */ + +static inline void nf_reset_ct(struct sk_buff *skb) { #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) - nf_conntrack_put(skb->nfct); - skb->nfct = NULL; -#endif -#ifdef NET_SKBUFF_NF_DEFRAG_NEEDED - nf_conntrack_put_reasm(skb->nfct_reasm); - skb->nfct_reasm = NULL; -#endif -#ifdef CONFIG_BRIDGE_NETFILTER - nf_bridge_put(skb->nf_bridge); - skb->nf_bridge = NULL; + nf_conntrack_put(skb_nfct(skb)); + skb->_nfct = 0; #endif } static inline void nf_reset_trace(struct sk_buff *skb) { -#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) +#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) || IS_ENABLED(CONFIG_NF_TABLES) skb->nf_trace = 0; #endif } -/* Note: This doesn't put any conntrack and bridge info in dst. */ -static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src) +static inline void ipvs_reset(struct sk_buff *skb) { -#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) - dst->nfct = src->nfct; - nf_conntrack_get(src->nfct); - dst->nfctinfo = src->nfctinfo; +#if IS_ENABLED(CONFIG_IP_VS) + skb->ipvs_property = 0; #endif -#ifdef NET_SKBUFF_NF_DEFRAG_NEEDED - dst->nfct_reasm = src->nfct_reasm; - nf_conntrack_get_reasm(src->nfct_reasm); +} + +/* Note: This doesn't put any conntrack info in dst. */ +static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src, + bool copy) +{ +#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) + dst->_nfct = src->_nfct; + nf_conntrack_get(skb_nfct(src)); #endif -#ifdef CONFIG_BRIDGE_NETFILTER - dst->nf_bridge = src->nf_bridge; - nf_bridge_get(src->nf_bridge); +#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) || IS_ENABLED(CONFIG_NF_TABLES) + if (copy) + dst->nf_trace = src->nf_trace; #endif } static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src) { #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) - nf_conntrack_put(dst->nfct); -#endif -#ifdef NET_SKBUFF_NF_DEFRAG_NEEDED - nf_conntrack_put_reasm(dst->nfct_reasm); + nf_conntrack_put(skb_nfct(dst)); #endif -#ifdef CONFIG_BRIDGE_NETFILTER - nf_bridge_put(dst->nf_bridge); -#endif - __nf_copy(dst, src); + dst->slow_gro = src->slow_gro; + __nf_copy(dst, src, true); } #ifdef CONFIG_NETWORK_SECMARK @@ -2695,6 +5152,24 @@ static inline void skb_init_secmark(struct sk_buff *skb) { } #endif +static inline int secpath_exists(const struct sk_buff *skb) +{ +#ifdef CONFIG_XFRM + return skb_ext_exist(skb, SKB_EXT_SEC_PATH); +#else + return 0; +#endif +} + +static inline bool skb_irq_freeable(const struct sk_buff *skb) +{ + return !skb->destructor && + !secpath_exists(skb) && + !skb_nfct(skb) && + !skb->_skb_refdst && + !skb_has_frag_list(skb); +} + static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping) { skb->queue_mapping = queue_mapping; @@ -2725,63 +5200,72 @@ static inline bool skb_rx_queue_recorded(const struct sk_buff *skb) return skb->queue_mapping != 0; } -extern u16 __skb_tx_hash(const struct net_device *dev, - const struct sk_buff *skb, - unsigned int num_tx_queues); +static inline void skb_set_dst_pending_confirm(struct sk_buff *skb, u32 val) +{ + skb->dst_pending_confirm = val; +} -#ifdef CONFIG_XFRM -static inline struct sec_path *skb_sec_path(struct sk_buff *skb) +static inline bool skb_get_dst_pending_confirm(const struct sk_buff *skb) { - return skb->sp; + return skb->dst_pending_confirm != 0; } -#else -static inline struct sec_path *skb_sec_path(struct sk_buff *skb) + +static inline struct sec_path *skb_sec_path(const struct sk_buff *skb) { +#ifdef CONFIG_XFRM + return skb_ext_find(skb, SKB_EXT_SEC_PATH); +#else return NULL; -} #endif +} -/* Keeps track of mac header offset relative to skb->head. - * It is useful for TSO of Tunneling protocol. e.g. GRE. - * For non-tunnel skb it points to skb_mac_header() and for - * tunnel skb it points to outer mac header. */ -struct skb_gso_cb { - int mac_offset; -}; -#define SKB_GSO_CB(skb) ((struct skb_gso_cb *)(skb)->cb) +static inline bool skb_is_gso(const struct sk_buff *skb) +{ + return skb_shinfo(skb)->gso_size; +} -static inline int skb_tnl_header_len(const struct sk_buff *inner_skb) +/* Note: Should be called only if skb_is_gso(skb) is true */ +static inline bool skb_is_gso_v6(const struct sk_buff *skb) { - return (skb_mac_header(inner_skb) - inner_skb->head) - - SKB_GSO_CB(inner_skb)->mac_offset; + return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6; } -static inline int gso_pskb_expand_head(struct sk_buff *skb, int extra) +/* Note: Should be called only if skb_is_gso(skb) is true */ +static inline bool skb_is_gso_sctp(const struct sk_buff *skb) { - int new_headroom, headroom; - int ret; + return skb_shinfo(skb)->gso_type & SKB_GSO_SCTP; +} - headroom = skb_headroom(skb); - ret = pskb_expand_head(skb, extra, 0, GFP_ATOMIC); - if (ret) - return ret; +/* Note: Should be called only if skb_is_gso(skb) is true */ +static inline bool skb_is_gso_tcp(const struct sk_buff *skb) +{ + return skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6); +} - new_headroom = skb_headroom(skb); - SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom); - return 0; +static inline void skb_gso_reset(struct sk_buff *skb) +{ + skb_shinfo(skb)->gso_size = 0; + skb_shinfo(skb)->gso_segs = 0; + skb_shinfo(skb)->gso_type = 0; } -static inline bool skb_is_gso(const struct sk_buff *skb) +static inline void skb_increase_gso_size(struct skb_shared_info *shinfo, + u16 increment) { - return skb_shinfo(skb)->gso_size; + if (WARN_ON_ONCE(shinfo->gso_size == GSO_BY_FRAGS)) + return; + shinfo->gso_size += increment; } -static inline bool skb_is_gso_v6(const struct sk_buff *skb) +static inline void skb_decrease_gso_size(struct skb_shared_info *shinfo, + u16 decrement) { - return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6; + if (WARN_ON_ONCE(shinfo->gso_size == GSO_BY_FRAGS)) + return; + shinfo->gso_size -= decrement; } -extern void __skb_warn_lro_forwarding(const struct sk_buff *skb); +void __skb_warn_lro_forwarding(const struct sk_buff *skb); static inline bool skb_warn_if_lro(const struct sk_buff *skb) { @@ -2814,14 +5298,15 @@ static inline void skb_forward_csum(struct sk_buff *skb) */ static inline void skb_checksum_none_assert(const struct sk_buff *skb) { -#ifdef DEBUG - BUG_ON(skb->ip_summed != CHECKSUM_NONE); -#endif + DEBUG_NET_WARN_ON_ONCE(skb->ip_summed != CHECKSUM_NONE); } bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off); -u32 __skb_get_poff(const struct sk_buff *skb); +int skb_checksum_setup(struct sk_buff *skb, bool recalculate); +struct sk_buff *skb_checksum_trimmed(struct sk_buff *skb, + unsigned int transport_len, + __sum16(*skb_chkf)(struct sk_buff *skb)); /** * skb_head_is_locked - Determine if the skb->head is locked down @@ -2836,5 +5321,104 @@ static inline bool skb_head_is_locked(const struct sk_buff *skb) { return !skb->head_frag || skb_cloned(skb); } + +/* Local Checksum Offload. + * Compute outer checksum based on the assumption that the + * inner checksum will be offloaded later. + * See Documentation/networking/checksum-offloads.rst for + * explanation of how this works. + * Fill in outer checksum adjustment (e.g. with sum of outer + * pseudo-header) before calling. + * Also ensure that inner checksum is in linear data area. + */ +static inline __wsum lco_csum(struct sk_buff *skb) +{ + unsigned char *csum_start = skb_checksum_start(skb); + unsigned char *l4_hdr = skb_transport_header(skb); + __wsum partial; + + /* Start with complement of inner checksum adjustment */ + partial = ~csum_unfold(*(__force __sum16 *)(csum_start + + skb->csum_offset)); + + /* Add in checksum of our headers (incl. outer checksum + * adjustment filled in by caller) and return result. + */ + return csum_partial(l4_hdr, csum_start - l4_hdr, partial); +} + +static inline bool skb_is_redirected(const struct sk_buff *skb) +{ + return skb->redirected; +} + +static inline void skb_set_redirected(struct sk_buff *skb, bool from_ingress) +{ + skb->redirected = 1; +#ifdef CONFIG_NET_REDIRECT + skb->from_ingress = from_ingress; + if (skb->from_ingress) + skb_clear_tstamp(skb); +#endif +} + +static inline void skb_reset_redirect(struct sk_buff *skb) +{ + skb->redirected = 0; +} + +static inline void skb_set_redirected_noclear(struct sk_buff *skb, + bool from_ingress) +{ + skb->redirected = 1; +#ifdef CONFIG_NET_REDIRECT + skb->from_ingress = from_ingress; +#endif +} + +static inline bool skb_csum_is_sctp(struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IP_SCTP) + return skb->csum_not_inet; +#else + return 0; +#endif +} + +static inline void skb_reset_csum_not_inet(struct sk_buff *skb) +{ + skb->ip_summed = CHECKSUM_NONE; +#if IS_ENABLED(CONFIG_IP_SCTP) + skb->csum_not_inet = 0; +#endif +} + +static inline void skb_set_kcov_handle(struct sk_buff *skb, + const u64 kcov_handle) +{ +#ifdef CONFIG_KCOV + skb->kcov_handle = kcov_handle; +#endif +} + +static inline u64 skb_get_kcov_handle(struct sk_buff *skb) +{ +#ifdef CONFIG_KCOV + return skb->kcov_handle; +#else + return 0; +#endif +} + +static inline void skb_mark_for_recycle(struct sk_buff *skb) +{ +#ifdef CONFIG_PAGE_POOL + skb->pp_recycle = 1; +#endif +} + +ssize_t skb_splice_from_iter(struct sk_buff *skb, struct iov_iter *iter, + ssize_t maxsize); + #endif /* __KERNEL__ */ #endif /* _LINUX_SKBUFF_H */ |