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-rw-r--r--net/ethernet/eth.c436
1 files changed, 325 insertions, 111 deletions
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 5359560926bc..13a63b48b7ee 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
@@ -31,11 +32,6 @@
* older network drivers and IFF_ALLMULTI.
* Christer Weinigel : Better rebuild header message.
* Andrew Morton : 26Feb01: kill ether_setup() - use netdev_boot_setup().
- *
- * 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.
*/
#include <linux/module.h>
#include <linux/types.h>
@@ -47,20 +43,25 @@
#include <linux/inet.h>
#include <linux/ip.h>
#include <linux/netdevice.h>
+#include <linux/nvmem-consumer.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/if_ether.h>
+#include <linux/of_net.h>
+#include <linux/pci.h>
+#include <linux/property.h>
#include <net/dst.h>
#include <net/arp.h>
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/ip.h>
#include <net/dsa.h>
-#include <asm/uaccess.h>
-
-__setup("ether=", netdev_boot_setup);
+#include <net/flow_dissector.h>
+#include <net/gro.h>
+#include <linux/uaccess.h>
+#include <net/pkt_sched.h>
/**
* eth_header - create the Ethernet header
@@ -79,7 +80,7 @@ int eth_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type,
const void *daddr, const void *saddr, unsigned int len)
{
- struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
+ struct ethhdr *eth = skb_push(skb, ETH_HLEN);
if (type != ETH_P_802_3 && type != ETH_P_802_2)
eth->h_proto = htons(type);
@@ -104,7 +105,7 @@ int eth_header(struct sk_buff *skb, struct net_device *dev,
*/
if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
- memset(eth->h_dest, 0, ETH_ALEN);
+ eth_zero_addr(eth->h_dest);
return ETH_HLEN;
}
@@ -113,37 +114,34 @@ int eth_header(struct sk_buff *skb, struct net_device *dev,
EXPORT_SYMBOL(eth_header);
/**
- * eth_rebuild_header- rebuild the Ethernet MAC header.
- * @skb: socket buffer to update
+ * eth_get_headlen - determine the length of header for an ethernet frame
+ * @dev: pointer to network device
+ * @data: pointer to start of frame
+ * @len: total length of frame
*
- * This is called after an ARP or IPV6 ndisc it's resolution on this
- * sk_buff. We now let protocol (ARP) fill in the other fields.
- *
- * This routine CANNOT use cached dst->neigh!
- * Really, it is used only when dst->neigh is wrong.
+ * Make a best effort attempt to pull the length for all of the headers for
+ * a given frame in a linear buffer.
*/
-int eth_rebuild_header(struct sk_buff *skb)
+u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len)
{
- struct ethhdr *eth = (struct ethhdr *)skb->data;
- struct net_device *dev = skb->dev;
-
- switch (eth->h_proto) {
-#ifdef CONFIG_INET
- case htons(ETH_P_IP):
- return arp_find(eth->h_dest, skb);
-#endif
- default:
- printk(KERN_DEBUG
- "%s: unable to resolve type %X addresses.\n",
- dev->name, ntohs(eth->h_proto));
-
- memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
- break;
- }
-
- return 0;
+ const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG;
+ const struct ethhdr *eth = (const struct ethhdr *)data;
+ struct flow_keys_basic keys;
+
+ /* this should never happen, but better safe than sorry */
+ if (unlikely(len < sizeof(*eth)))
+ return len;
+
+ /* parse any remaining L2/L3 headers, check for L4 */
+ if (!skb_flow_dissect_flow_keys_basic(dev_net(dev), NULL, &keys, data,
+ eth->h_proto, sizeof(*eth),
+ len, flags))
+ return max_t(u32, keys.control.thoff, sizeof(*eth));
+
+ /* parse for any L4 headers */
+ return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
}
-EXPORT_SYMBOL(eth_rebuild_header);
+EXPORT_SYMBOL(eth_get_headlen);
/**
* eth_type_trans - determine the packet's protocol ID.
@@ -156,33 +154,15 @@ EXPORT_SYMBOL(eth_rebuild_header);
*/
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
{
- struct ethhdr *eth;
+ const unsigned short *sap;
+ const struct ethhdr *eth;
+ __be16 res;
skb->dev = dev;
skb_reset_mac_header(skb);
- skb_pull_inline(skb, ETH_HLEN);
- eth = eth_hdr(skb);
-
- if (unlikely(is_multicast_ether_addr(eth->h_dest))) {
- if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
- skb->pkt_type = PACKET_BROADCAST;
- else
- skb->pkt_type = PACKET_MULTICAST;
- }
- /*
- * This ALLMULTI check should be redundant by 1.4
- * so don't forget to remove it.
- *
- * Seems, you forgot to remove it. All silly devices
- * seems to set IFF_PROMISC.
- */
-
- else if (1 /*dev->flags&IFF_PROMISC */ ) {
- if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
- dev->dev_addr)))
- skb->pkt_type = PACKET_OTHERHOST;
- }
+ eth = eth_skb_pull_mac(skb);
+ eth_skb_pkt_type(skb, dev);
/*
* Some variants of DSA tagging don't have an ethertype field
@@ -190,12 +170,10 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
* variants has been configured on the receiving interface,
* and if so, set skb->protocol without looking at the packet.
*/
- if (netdev_uses_dsa_tags(dev))
- return htons(ETH_P_DSA);
- if (netdev_uses_trailer_tags(dev))
- return htons(ETH_P_TRAILER);
+ if (unlikely(netdev_uses_dsa(dev)))
+ return htons(ETH_P_XDSA);
- if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
+ if (likely(eth_proto_is_802_3(eth->h_proto)))
return eth->h_proto;
/*
@@ -203,14 +181,15 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
* the protocol design and runs IPX over 802.3 without an 802.2 LLC
* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
* won't work for fault tolerant netware but does for the rest.
+ * We use skb->dev as temporary storage to not hit
+ * CONFIG_STACKPROTECTOR_STRONG=y costs on some platforms.
*/
- if (skb->len >= 2 && *(unsigned short *)(skb->data) == 0xFFFF)
- return htons(ETH_P_802_3);
+ sap = skb_header_pointer(skb, 0, sizeof(*sap), &skb->dev);
+ res = (sap && *sap == 0xFFFF) ? htons(ETH_P_802_3) : htons(ETH_P_802_2);
- /*
- * Real 802.2 LLC
- */
- return htons(ETH_P_802_2);
+ /* restore skb->dev in case it was mangled by skb_header_pointer(). */
+ skb->dev = dev;
+ return res;
}
EXPORT_SYMBOL(eth_type_trans);
@@ -249,7 +228,12 @@ int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16
eth->h_proto = type;
memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
- hh->hh_len = ETH_HLEN;
+
+ /* Pairs with READ_ONCE() in neigh_resolve_output(),
+ * neigh_hh_output() and neigh_update_hhs().
+ */
+ smp_store_release(&hh->hh_len, ETH_HLEN);
+
return 0;
}
EXPORT_SYMBOL(eth_header_cache);
@@ -272,6 +256,18 @@ void eth_header_cache_update(struct hh_cache *hh,
EXPORT_SYMBOL(eth_header_cache_update);
/**
+ * eth_header_parse_protocol - extract protocol from L2 header
+ * @skb: packet to extract protocol from
+ */
+__be16 eth_header_parse_protocol(const struct sk_buff *skb)
+{
+ const struct ethhdr *eth = eth_hdr(skb);
+
+ return eth->h_proto;
+}
+EXPORT_SYMBOL(eth_header_parse_protocol);
+
+/**
* eth_prepare_mac_addr_change - prepare for mac change
* @dev: network device
* @p: socket address
@@ -297,7 +293,7 @@ void eth_commit_mac_addr_change(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
- memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+ eth_hw_addr_set(dev, addr->sa_data);
}
EXPORT_SYMBOL(eth_commit_mac_addr_change);
@@ -323,23 +319,6 @@ int eth_mac_addr(struct net_device *dev, void *p)
}
EXPORT_SYMBOL(eth_mac_addr);
-/**
- * eth_change_mtu - set new MTU size
- * @dev: network device
- * @new_mtu: new Maximum Transfer Unit
- *
- * Allow changing MTU size. Needs to be overridden for devices
- * supporting jumbo frames.
- */
-int eth_change_mtu(struct net_device *dev, int new_mtu)
-{
- if (new_mtu < 68 || new_mtu > ETH_DATA_LEN)
- return -EINVAL;
- dev->mtu = new_mtu;
- return 0;
-}
-EXPORT_SYMBOL(eth_change_mtu);
-
int eth_validate_addr(struct net_device *dev)
{
if (!is_valid_ether_addr(dev->dev_addr))
@@ -352,9 +331,9 @@ EXPORT_SYMBOL(eth_validate_addr);
const struct header_ops eth_header_ops ____cacheline_aligned = {
.create = eth_header,
.parse = eth_header_parse,
- .rebuild = eth_rebuild_header,
.cache = eth_header_cache,
.cache_update = eth_header_cache_update,
+ .parse_protocol = eth_header_parse_protocol,
};
/**
@@ -368,13 +347,16 @@ void ether_setup(struct net_device *dev)
dev->header_ops = &eth_header_ops;
dev->type = ARPHRD_ETHER;
dev->hard_header_len = ETH_HLEN;
+ dev->min_header_len = ETH_HLEN;
dev->mtu = ETH_DATA_LEN;
+ dev->min_mtu = ETH_MIN_MTU;
+ dev->max_mtu = ETH_DATA_LEN;
dev->addr_len = ETH_ALEN;
- dev->tx_queue_len = 1000; /* Ethernet wants good queues */
+ dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
dev->flags = IFF_BROADCAST|IFF_MULTICAST;
dev->priv_flags |= IFF_TX_SKB_SHARING;
- memset(dev->broadcast, 0xFF, ETH_ALEN);
+ eth_broadcast_addr(dev->broadcast);
}
EXPORT_SYMBOL(ether_setup);
@@ -397,31 +379,263 @@ EXPORT_SYMBOL(ether_setup);
struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
unsigned int rxqs)
{
- return alloc_netdev_mqs(sizeof_priv, "eth%d", ether_setup, txqs, rxqs);
+ return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_ENUM,
+ ether_setup, txqs, rxqs);
}
EXPORT_SYMBOL(alloc_etherdev_mqs);
-static size_t _format_mac_addr(char *buf, int buflen,
- const unsigned char *addr, int len)
+ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
+{
+ return sysfs_emit(buf, "%*phC\n", len, addr);
+}
+EXPORT_SYMBOL(sysfs_format_mac);
+
+struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb)
{
- int i;
- char *cp = buf;
-
- for (i = 0; i < len; i++) {
- cp += scnprintf(cp, buflen - (cp - buf), "%02x", addr[i]);
- if (i == len - 1)
- break;
- cp += scnprintf(cp, buflen - (cp - buf), ":");
+ const struct packet_offload *ptype;
+ unsigned int hlen, off_eth;
+ struct sk_buff *pp = NULL;
+ struct ethhdr *eh, *eh2;
+ struct sk_buff *p;
+ __be16 type;
+ int flush = 1;
+
+ off_eth = skb_gro_offset(skb);
+ hlen = off_eth + sizeof(*eh);
+ eh = skb_gro_header(skb, hlen, off_eth);
+ if (unlikely(!eh))
+ goto out;
+
+ flush = 0;
+
+ list_for_each_entry(p, head, list) {
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ eh2 = (struct ethhdr *)(p->data + off_eth);
+ if (compare_ether_header(eh, eh2)) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+ }
+
+ type = eh->h_proto;
+
+ ptype = gro_find_receive_by_type(type);
+ if (ptype == NULL) {
+ flush = 1;
+ goto out;
}
- return cp - buf;
+
+ skb_gro_pull(skb, sizeof(*eh));
+ skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
+
+ pp = indirect_call_gro_receive_inet(ptype->callbacks.gro_receive,
+ ipv6_gro_receive, inet_gro_receive,
+ head, skb);
+
+out:
+ skb_gro_flush_final(skb, pp, flush);
+
+ return pp;
}
+EXPORT_SYMBOL(eth_gro_receive);
-ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
+int eth_gro_complete(struct sk_buff *skb, int nhoff)
{
- size_t l;
+ struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
+ __be16 type = eh->h_proto;
+ struct packet_offload *ptype;
+ int err = -ENOSYS;
+
+ if (skb->encapsulation)
+ skb_set_inner_mac_header(skb, nhoff);
- l = _format_mac_addr(buf, PAGE_SIZE, addr, len);
- l += scnprintf(buf + l, PAGE_SIZE - l, "\n");
- return (ssize_t)l;
+ ptype = gro_find_complete_by_type(type);
+ if (ptype != NULL)
+ err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
+ ipv6_gro_complete, inet_gro_complete,
+ skb, nhoff + sizeof(*eh));
+
+ return err;
}
-EXPORT_SYMBOL(sysfs_format_mac);
+EXPORT_SYMBOL(eth_gro_complete);
+
+static struct packet_offload eth_packet_offload __read_mostly = {
+ .type = cpu_to_be16(ETH_P_TEB),
+ .priority = 10,
+ .callbacks = {
+ .gro_receive = eth_gro_receive,
+ .gro_complete = eth_gro_complete,
+ },
+};
+
+static int __init eth_offload_init(void)
+{
+ dev_add_offload(&eth_packet_offload);
+
+ return 0;
+}
+
+fs_initcall(eth_offload_init);
+
+unsigned char * __weak arch_get_platform_mac_address(void)
+{
+ return NULL;
+}
+
+int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
+{
+ unsigned char *addr;
+ int ret;
+
+ ret = of_get_mac_address(dev->of_node, mac_addr);
+ if (!ret)
+ return 0;
+
+ addr = arch_get_platform_mac_address();
+ if (!addr)
+ return -ENODEV;
+
+ ether_addr_copy(mac_addr, addr);
+
+ return 0;
+}
+EXPORT_SYMBOL(eth_platform_get_mac_address);
+
+/**
+ * platform_get_ethdev_address - Set netdev's MAC address from a given device
+ * @dev: Pointer to the device
+ * @netdev: Pointer to netdev to write the address to
+ *
+ * Wrapper around eth_platform_get_mac_address() which writes the address
+ * directly to netdev->dev_addr.
+ */
+int platform_get_ethdev_address(struct device *dev, struct net_device *netdev)
+{
+ u8 addr[ETH_ALEN] __aligned(2);
+ int ret;
+
+ ret = eth_platform_get_mac_address(dev, addr);
+ if (!ret)
+ eth_hw_addr_set(netdev, addr);
+ return ret;
+}
+EXPORT_SYMBOL(platform_get_ethdev_address);
+
+/**
+ * nvmem_get_mac_address - Obtain the MAC address from an nvmem cell named
+ * 'mac-address' associated with given device.
+ *
+ * @dev: Device with which the mac-address cell is associated.
+ * @addrbuf: Buffer to which the MAC address will be copied on success.
+ *
+ * Returns 0 on success or a negative error number on failure.
+ */
+int nvmem_get_mac_address(struct device *dev, void *addrbuf)
+{
+ struct nvmem_cell *cell;
+ const void *mac;
+ size_t len;
+
+ cell = nvmem_cell_get(dev, "mac-address");
+ if (IS_ERR(cell))
+ return PTR_ERR(cell);
+
+ mac = nvmem_cell_read(cell, &len);
+ nvmem_cell_put(cell);
+
+ if (IS_ERR(mac))
+ return PTR_ERR(mac);
+
+ if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
+ kfree(mac);
+ return -EINVAL;
+ }
+
+ ether_addr_copy(addrbuf, mac);
+ kfree(mac);
+
+ return 0;
+}
+
+static int fwnode_get_mac_addr(struct fwnode_handle *fwnode,
+ const char *name, char *addr)
+{
+ int ret;
+
+ ret = fwnode_property_read_u8_array(fwnode, name, addr, ETH_ALEN);
+ if (ret)
+ return ret;
+
+ if (!is_valid_ether_addr(addr))
+ return -EINVAL;
+ return 0;
+}
+
+/**
+ * fwnode_get_mac_address - Get the MAC from the firmware node
+ * @fwnode: Pointer to the firmware node
+ * @addr: Address of buffer to store the MAC in
+ *
+ * Search the firmware node for the best MAC address to use. 'mac-address' is
+ * checked first, because that is supposed to contain to "most recent" MAC
+ * address. If that isn't set, then 'local-mac-address' is checked next,
+ * because that is the default address. If that isn't set, then the obsolete
+ * 'address' is checked, just in case we're using an old device tree.
+ *
+ * Note that the 'address' property is supposed to contain a virtual address of
+ * the register set, but some DTS files have redefined that property to be the
+ * MAC address.
+ *
+ * All-zero MAC addresses are rejected, because those could be properties that
+ * exist in the firmware tables, but were not updated by the firmware. For
+ * example, the DTS could define 'mac-address' and 'local-mac-address', with
+ * zero MAC addresses. Some older U-Boots only initialized 'local-mac-address'.
+ * In this case, the real MAC is in 'local-mac-address', and 'mac-address'
+ * exists but is all zeros.
+ */
+int fwnode_get_mac_address(struct fwnode_handle *fwnode, char *addr)
+{
+ if (!fwnode_get_mac_addr(fwnode, "mac-address", addr) ||
+ !fwnode_get_mac_addr(fwnode, "local-mac-address", addr) ||
+ !fwnode_get_mac_addr(fwnode, "address", addr))
+ return 0;
+
+ return -ENOENT;
+}
+EXPORT_SYMBOL(fwnode_get_mac_address);
+
+/**
+ * device_get_mac_address - Get the MAC for a given device
+ * @dev: Pointer to the device
+ * @addr: Address of buffer to store the MAC in
+ */
+int device_get_mac_address(struct device *dev, char *addr)
+{
+ if (!fwnode_get_mac_address(dev_fwnode(dev), addr))
+ return 0;
+
+ return nvmem_get_mac_address(dev, addr);
+}
+EXPORT_SYMBOL(device_get_mac_address);
+
+/**
+ * device_get_ethdev_address - Set netdev's MAC address from a given device
+ * @dev: Pointer to the device
+ * @netdev: Pointer to netdev to write the address to
+ *
+ * Wrapper around device_get_mac_address() which writes the address
+ * directly to netdev->dev_addr.
+ */
+int device_get_ethdev_address(struct device *dev, struct net_device *netdev)
+{
+ u8 addr[ETH_ALEN];
+ int ret;
+
+ ret = device_get_mac_address(dev, addr);
+ if (!ret)
+ eth_hw_addr_set(netdev, addr);
+ return ret;
+}
+EXPORT_SYMBOL(device_get_ethdev_address);
generated by cgit (git 2.34.1) at 2025-12-25 04:44:50 +0000