diff options
Diffstat (limited to 'net/ipv4/netfilter')
| -rw-r--r-- | net/ipv4/netfilter/Kconfig | 29 | ||||
| -rw-r--r-- | net/ipv4/netfilter/Makefile | 5 | ||||
| -rw-r--r-- | net/ipv4/netfilter/ipt_ULOG.c | 498 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 6 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_conntrack_proto_icmp.c | 4 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_defrag_ipv4.c | 8 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_log_arp.c | 149 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_log_ipv4.c | 385 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_l3proto_ipv4.c | 4 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_gre.c | 2 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_icmp.c | 2 |
11 files changed, 563 insertions, 529 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig index a26ce035e3fa..fb173126f03d 100644 --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -36,6 +36,16 @@ config NF_CONNTRACK_PROC_COMPAT If unsure, say Y. +config NF_LOG_ARP + tristate "ARP packet logging" + default m if NETFILTER_ADVANCED=n + select NF_LOG_COMMON + +config NF_LOG_IPV4 + tristate "IPv4 packet logging" + default m if NETFILTER_ADVANCED=n + select NF_LOG_COMMON + config NF_TABLES_IPV4 depends on NF_TABLES tristate "IPv4 nf_tables support" @@ -159,25 +169,6 @@ config IP_NF_TARGET_SYNPROXY To compile it as a module, choose M here. If unsure, say N. -config IP_NF_TARGET_ULOG - tristate "ULOG target support (obsolete)" - default m if NETFILTER_ADVANCED=n - ---help--- - - This option enables the old IPv4-only "ipt_ULOG" implementation - which has been obsoleted by the new "nfnetlink_log" code (see - CONFIG_NETFILTER_NETLINK_LOG). - - This option adds a `ULOG' target, which allows you to create rules in - any iptables table. The packet is passed to a userspace logging - daemon using netlink multicast sockets; unlike the LOG target - which can only be viewed through syslog. - - The appropriate userspace logging daemon (ulogd) may be obtained from - <http://www.netfilter.org/projects/ulogd/index.html> - - To compile it as a module, choose M here. If unsure, say N. - # NAT + specific targets: nf_conntrack config NF_NAT_IPV4 tristate "IPv4 NAT" diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile index 90b82405331e..33001621465b 100644 --- a/net/ipv4/netfilter/Makefile +++ b/net/ipv4/netfilter/Makefile @@ -19,6 +19,10 @@ obj-$(CONFIG_NF_NAT_IPV4) += nf_nat_ipv4.o # defrag obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o +# logging +obj-$(CONFIG_NF_LOG_ARP) += nf_log_arp.o +obj-$(CONFIG_NF_LOG_IPV4) += nf_log_ipv4.o + # NAT helpers (nf_conntrack) obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o @@ -53,7 +57,6 @@ obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_ECN.o obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o obj-$(CONFIG_IP_NF_TARGET_SYNPROXY) += ipt_SYNPROXY.o -obj-$(CONFIG_IP_NF_TARGET_ULOG) += ipt_ULOG.o # generic ARP tables obj-$(CONFIG_IP_NF_ARPTABLES) += arp_tables.o diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c deleted file mode 100644 index 9cb993cd224b..000000000000 --- a/net/ipv4/netfilter/ipt_ULOG.c +++ /dev/null @@ -1,498 +0,0 @@ -/* - * netfilter module for userspace packet logging daemons - * - * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> - * (C) 1999-2001 Paul `Rusty' Russell - * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> - * (C) 2005-2007 Patrick McHardy <kaber@trash.net> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This module accepts two parameters: - * - * nlbufsiz: - * The parameter specifies how big the buffer for each netlink multicast - * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will - * get accumulated in the kernel until they are sent to userspace. It is - * NOT possible to allocate more than 128kB, and it is strongly discouraged, - * because atomically allocating 128kB inside the network rx softirq is not - * reliable. Please also keep in mind that this buffer size is allocated for - * each nlgroup you are using, so the total kernel memory usage increases - * by that factor. - * - * Actually you should use nlbufsiz a bit smaller than PAGE_SIZE, since - * nlbufsiz is used with alloc_skb, which adds another - * sizeof(struct skb_shared_info). Use NLMSG_GOODSIZE instead. - * - * flushtimeout: - * Specify, after how many hundredths of a second the queue should be - * flushed even if it is not full yet. - */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt -#include <linux/module.h> -#include <linux/spinlock.h> -#include <linux/socket.h> -#include <linux/slab.h> -#include <linux/skbuff.h> -#include <linux/kernel.h> -#include <linux/timer.h> -#include <net/netlink.h> -#include <linux/netdevice.h> -#include <linux/mm.h> -#include <linux/moduleparam.h> -#include <linux/netfilter.h> -#include <linux/netfilter/x_tables.h> -#include <linux/netfilter_ipv4/ipt_ULOG.h> -#include <net/netfilter/nf_log.h> -#include <net/netns/generic.h> -#include <net/sock.h> -#include <linux/bitops.h> -#include <asm/unaligned.h> - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>"); -MODULE_DESCRIPTION("Xtables: packet logging to netlink using ULOG"); -MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NFLOG); - -#define ULOG_NL_EVENT 111 /* Harald's favorite number */ -#define ULOG_MAXNLGROUPS 32 /* numer of nlgroups */ - -static unsigned int nlbufsiz = NLMSG_GOODSIZE; -module_param(nlbufsiz, uint, 0400); -MODULE_PARM_DESC(nlbufsiz, "netlink buffer size"); - -static unsigned int flushtimeout = 10; -module_param(flushtimeout, uint, 0600); -MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second)"); - -static bool nflog = true; -module_param(nflog, bool, 0400); -MODULE_PARM_DESC(nflog, "register as internal netfilter logging module"); - -/* global data structures */ - -typedef struct { - unsigned int qlen; /* number of nlmsgs' in the skb */ - struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ - struct sk_buff *skb; /* the pre-allocated skb */ - struct timer_list timer; /* the timer function */ -} ulog_buff_t; - -static int ulog_net_id __read_mostly; -struct ulog_net { - unsigned int nlgroup[ULOG_MAXNLGROUPS]; - ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS]; - struct sock *nflognl; - spinlock_t lock; -}; - -static struct ulog_net *ulog_pernet(struct net *net) -{ - return net_generic(net, ulog_net_id); -} - -/* send one ulog_buff_t to userspace */ -static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum) -{ - ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum]; - - pr_debug("ulog_send: timer is deleting\n"); - del_timer(&ub->timer); - - if (!ub->skb) { - pr_debug("ulog_send: nothing to send\n"); - return; - } - - /* last nlmsg needs NLMSG_DONE */ - if (ub->qlen > 1) - ub->lastnlh->nlmsg_type = NLMSG_DONE; - - NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1; - pr_debug("throwing %d packets to netlink group %u\n", - ub->qlen, nlgroupnum + 1); - netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1, - GFP_ATOMIC); - - ub->qlen = 0; - ub->skb = NULL; - ub->lastnlh = NULL; -} - - -/* timer function to flush queue in flushtimeout time */ -static void ulog_timer(unsigned long data) -{ - unsigned int groupnum = *((unsigned int *)data); - struct ulog_net *ulog = container_of((void *)data, - struct ulog_net, - nlgroup[groupnum]); - pr_debug("timer function called, calling ulog_send\n"); - - /* lock to protect against somebody modifying our structure - * from ipt_ulog_target at the same time */ - spin_lock_bh(&ulog->lock); - ulog_send(ulog, groupnum); - spin_unlock_bh(&ulog->lock); -} - -static struct sk_buff *ulog_alloc_skb(unsigned int size) -{ - struct sk_buff *skb; - unsigned int n; - - /* alloc skb which should be big enough for a whole - * multipart message. WARNING: has to be <= 131000 - * due to slab allocator restrictions */ - - n = max(size, nlbufsiz); - skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN); - if (!skb) { - if (n > size) { - /* try to allocate only as much as we need for - * current packet */ - - skb = alloc_skb(size, GFP_ATOMIC); - if (!skb) - pr_debug("cannot even allocate %ub\n", size); - } - } - - return skb; -} - -static void ipt_ulog_packet(struct net *net, - unsigned int hooknum, - const struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - const struct ipt_ulog_info *loginfo, - const char *prefix) -{ - ulog_buff_t *ub; - ulog_packet_msg_t *pm; - size_t size, copy_len; - struct nlmsghdr *nlh; - struct timeval tv; - struct ulog_net *ulog = ulog_pernet(net); - - /* ffs == find first bit set, necessary because userspace - * is already shifting groupnumber, but we need unshifted. - * ffs() returns [1..32], we need [0..31] */ - unsigned int groupnum = ffs(loginfo->nl_group) - 1; - - /* calculate the size of the skb needed */ - if (loginfo->copy_range == 0 || loginfo->copy_range > skb->len) - copy_len = skb->len; - else - copy_len = loginfo->copy_range; - - size = nlmsg_total_size(sizeof(*pm) + copy_len); - - ub = &ulog->ulog_buffers[groupnum]; - - spin_lock_bh(&ulog->lock); - - if (!ub->skb) { - if (!(ub->skb = ulog_alloc_skb(size))) - goto alloc_failure; - } else if (ub->qlen >= loginfo->qthreshold || - size > skb_tailroom(ub->skb)) { - /* either the queue len is too high or we don't have - * enough room in nlskb left. send it to userspace. */ - - ulog_send(ulog, groupnum); - - if (!(ub->skb = ulog_alloc_skb(size))) - goto alloc_failure; - } - - pr_debug("qlen %d, qthreshold %Zu\n", ub->qlen, loginfo->qthreshold); - - nlh = nlmsg_put(ub->skb, 0, ub->qlen, ULOG_NL_EVENT, - sizeof(*pm)+copy_len, 0); - if (!nlh) { - pr_debug("error during nlmsg_put\n"); - goto out_unlock; - } - ub->qlen++; - - pm = nlmsg_data(nlh); - memset(pm, 0, sizeof(*pm)); - - /* We might not have a timestamp, get one */ - if (skb->tstamp.tv64 == 0) - __net_timestamp((struct sk_buff *)skb); - - /* copy hook, prefix, timestamp, payload, etc. */ - pm->data_len = copy_len; - tv = ktime_to_timeval(skb->tstamp); - put_unaligned(tv.tv_sec, &pm->timestamp_sec); - put_unaligned(tv.tv_usec, &pm->timestamp_usec); - put_unaligned(skb->mark, &pm->mark); - pm->hook = hooknum; - if (prefix != NULL) { - strncpy(pm->prefix, prefix, sizeof(pm->prefix) - 1); - pm->prefix[sizeof(pm->prefix) - 1] = '\0'; - } - else if (loginfo->prefix[0] != '\0') - strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix)); - - if (in && in->hard_header_len > 0 && - skb->mac_header != skb->network_header && - in->hard_header_len <= ULOG_MAC_LEN) { - memcpy(pm->mac, skb_mac_header(skb), in->hard_header_len); - pm->mac_len = in->hard_header_len; - } else - pm->mac_len = 0; - - if (in) - strncpy(pm->indev_name, in->name, sizeof(pm->indev_name)); - - if (out) - strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name)); - - /* copy_len <= skb->len, so can't fail. */ - if (skb_copy_bits(skb, 0, pm->payload, copy_len) < 0) - BUG(); - - /* check if we are building multi-part messages */ - if (ub->qlen > 1) - ub->lastnlh->nlmsg_flags |= NLM_F_MULTI; - - ub->lastnlh = nlh; - - /* if timer isn't already running, start it */ - if (!timer_pending(&ub->timer)) { - ub->timer.expires = jiffies + flushtimeout * HZ / 100; - add_timer(&ub->timer); - } - - /* if threshold is reached, send message to userspace */ - if (ub->qlen >= loginfo->qthreshold) { - if (loginfo->qthreshold > 1) - nlh->nlmsg_type = NLMSG_DONE; - ulog_send(ulog, groupnum); - } -out_unlock: - spin_unlock_bh(&ulog->lock); - - return; - -alloc_failure: - pr_debug("Error building netlink message\n"); - spin_unlock_bh(&ulog->lock); -} - -static unsigned int -ulog_tg(struct sk_buff *skb, const struct xt_action_param *par) -{ - struct net *net = dev_net(par->in ? par->in : par->out); - - ipt_ulog_packet(net, par->hooknum, skb, par->in, par->out, - par->targinfo, NULL); - return XT_CONTINUE; -} - -static void ipt_logfn(struct net *net, - u_int8_t pf, - unsigned int hooknum, - const struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - const struct nf_loginfo *li, - const char *prefix) -{ - struct ipt_ulog_info loginfo; - - if (!li || li->type != NF_LOG_TYPE_ULOG) { - loginfo.nl_group = ULOG_DEFAULT_NLGROUP; - loginfo.copy_range = 0; - loginfo.qthreshold = ULOG_DEFAULT_QTHRESHOLD; - loginfo.prefix[0] = '\0'; - } else { - loginfo.nl_group = li->u.ulog.group; - loginfo.copy_range = li->u.ulog.copy_len; - loginfo.qthreshold = li->u.ulog.qthreshold; - strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix)); - } - - ipt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix); -} - -static int ulog_tg_check(const struct xt_tgchk_param *par) -{ - const struct ipt_ulog_info *loginfo = par->targinfo; - - if (!par->net->xt.ulog_warn_deprecated) { - pr_info("ULOG is deprecated and it will be removed soon, " - "use NFLOG instead\n"); - par->net->xt.ulog_warn_deprecated = true; - } - - if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') { - pr_debug("prefix not null-terminated\n"); - return -EINVAL; - } - if (loginfo->qthreshold > ULOG_MAX_QLEN) { - pr_debug("queue threshold %Zu > MAX_QLEN\n", - loginfo->qthreshold); - return -EINVAL; - } - return 0; -} - -#ifdef CONFIG_COMPAT -struct compat_ipt_ulog_info { - compat_uint_t nl_group; - compat_size_t copy_range; - compat_size_t qthreshold; - char prefix[ULOG_PREFIX_LEN]; -}; - -static void ulog_tg_compat_from_user(void *dst, const void *src) -{ - const struct compat_ipt_ulog_info *cl = src; - struct ipt_ulog_info l = { - .nl_group = cl->nl_group, - .copy_range = cl->copy_range, - .qthreshold = cl->qthreshold, - }; - - memcpy(l.prefix, cl->prefix, sizeof(l.prefix)); - memcpy(dst, &l, sizeof(l)); -} - -static int ulog_tg_compat_to_user(void __user *dst, const void *src) -{ - const struct ipt_ulog_info *l = src; - struct compat_ipt_ulog_info cl = { - .nl_group = l->nl_group, - .copy_range = l->copy_range, - .qthreshold = l->qthreshold, - }; - - memcpy(cl.prefix, l->prefix, sizeof(cl.prefix)); - return copy_to_user(dst, &cl, sizeof(cl)) ? -EFAULT : 0; -} -#endif /* CONFIG_COMPAT */ - -static struct xt_target ulog_tg_reg __read_mostly = { - .name = "ULOG", - .family = NFPROTO_IPV4, - .target = ulog_tg, - .targetsize = sizeof(struct ipt_ulog_info), - .checkentry = ulog_tg_check, -#ifdef CONFIG_COMPAT - .compatsize = sizeof(struct compat_ipt_ulog_info), - .compat_from_user = ulog_tg_compat_from_user, - .compat_to_user = ulog_tg_compat_to_user, -#endif - .me = THIS_MODULE, -}; - -static struct nf_logger ipt_ulog_logger __read_mostly = { - .name = "ipt_ULOG", - .logfn = ipt_logfn, - .me = THIS_MODULE, -}; - -static int __net_init ulog_tg_net_init(struct net *net) -{ - int i; - struct ulog_net *ulog = ulog_pernet(net); - struct netlink_kernel_cfg cfg = { - .groups = ULOG_MAXNLGROUPS, - }; - - spin_lock_init(&ulog->lock); - /* initialize ulog_buffers */ - for (i = 0; i < ULOG_MAXNLGROUPS; i++) { - ulog->nlgroup[i] = i; - setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer, - (unsigned long)&ulog->nlgroup[i]); - } - - ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg); - if (!ulog->nflognl) - return -ENOMEM; - - if (nflog) - nf_log_set(net, NFPROTO_IPV4, &ipt_ulog_logger); - - return 0; -} - -static void __net_exit ulog_tg_net_exit(struct net *net) -{ - ulog_buff_t *ub; - int i; - struct ulog_net *ulog = ulog_pernet(net); - - if (nflog) - nf_log_unset(net, &ipt_ulog_logger); - - netlink_kernel_release(ulog->nflognl); - - /* remove pending timers and free allocated skb's */ - for (i = 0; i < ULOG_MAXNLGROUPS; i++) { - ub = &ulog->ulog_buffers[i]; - pr_debug("timer is deleting\n"); - del_timer(&ub->timer); - - if (ub->skb) { - kfree_skb(ub->skb); - ub->skb = NULL; - } - } -} - -static struct pernet_operations ulog_tg_net_ops = { - .init = ulog_tg_net_init, - .exit = ulog_tg_net_exit, - .id = &ulog_net_id, - .size = sizeof(struct ulog_net), -}; - -static int __init ulog_tg_init(void) -{ - int ret; - pr_debug("init module\n"); - - if (nlbufsiz > 128*1024) { - pr_warn("Netlink buffer has to be <= 128kB\n"); - return -EINVAL; - } - - ret = register_pernet_subsys(&ulog_tg_net_ops); - if (ret) - goto out_pernet; - - ret = xt_register_target(&ulog_tg_reg); - if (ret < 0) - goto out_target; - - if (nflog) - nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger); - - return 0; - -out_target: - unregister_pernet_subsys(&ulog_tg_net_ops); -out_pernet: - return ret; -} - -static void __exit ulog_tg_exit(void) -{ - pr_debug("cleanup_module\n"); - if (nflog) - nf_log_unregister(&ipt_ulog_logger); - xt_unregister_target(&ulog_tg_reg); - unregister_pernet_subsys(&ulog_tg_net_ops); -} - -module_init(ulog_tg_init); -module_exit(ulog_tg_exit); diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c index 8127dc802865..a054fe083431 100644 --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c @@ -314,7 +314,7 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len) return -ENOENT; } -#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) #include <linux/netfilter/nfnetlink.h> #include <linux/netfilter/nfnetlink_conntrack.h> @@ -358,7 +358,7 @@ static struct nf_sockopt_ops so_getorigdst = { .pf = PF_INET, .get_optmin = SO_ORIGINAL_DST, .get_optmax = SO_ORIGINAL_DST+1, - .get = &getorigdst, + .get = getorigdst, .owner = THIS_MODULE, }; @@ -388,7 +388,7 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { .invert_tuple = ipv4_invert_tuple, .print_tuple = ipv4_print_tuple, .get_l4proto = ipv4_get_l4proto, -#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) .tuple_to_nlattr = ipv4_tuple_to_nlattr, .nlattr_tuple_size = ipv4_nlattr_tuple_size, .nlattr_to_tuple = ipv4_nlattr_to_tuple, diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c index a338dad41b7d..b91b2641adda 100644 --- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c +++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c @@ -226,7 +226,7 @@ icmp_error(struct net *net, struct nf_conn *tmpl, return icmp_error_message(net, tmpl, skb, ctinfo, hooknum); } -#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) #include <linux/netfilter/nfnetlink.h> #include <linux/netfilter/nfnetlink_conntrack.h> @@ -408,7 +408,7 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly = .error = icmp_error, .destroy = NULL, .me = NULL, -#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) .tuple_to_nlattr = icmp_tuple_to_nlattr, .nlattr_tuple_size = icmp_nlattr_tuple_size, .nlattr_to_tuple = icmp_nlattr_to_tuple, diff --git a/net/ipv4/netfilter/nf_defrag_ipv4.c b/net/ipv4/netfilter/nf_defrag_ipv4.c index b8f6381c7d0b..76bd1aef257f 100644 --- a/net/ipv4/netfilter/nf_defrag_ipv4.c +++ b/net/ipv4/netfilter/nf_defrag_ipv4.c @@ -17,7 +17,7 @@ #include <linux/netfilter_bridge.h> #include <linux/netfilter_ipv4.h> #include <net/netfilter/ipv4/nf_defrag_ipv4.h> -#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) +#if IS_ENABLED(CONFIG_NF_CONNTRACK) #include <net/netfilter/nf_conntrack.h> #endif #include <net/netfilter/nf_conntrack_zones.h> @@ -45,7 +45,7 @@ static enum ip_defrag_users nf_ct_defrag_user(unsigned int hooknum, { u16 zone = NF_CT_DEFAULT_ZONE; -#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) +#if IS_ENABLED(CONFIG_NF_CONNTRACK) if (skb->nfct) zone = nf_ct_zone((struct nf_conn *)skb->nfct); #endif @@ -74,8 +74,8 @@ static unsigned int ipv4_conntrack_defrag(const struct nf_hook_ops *ops, inet->nodefrag) return NF_ACCEPT; -#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) -#if !defined(CONFIG_NF_NAT) && !defined(CONFIG_NF_NAT_MODULE) +#if IS_ENABLED(CONFIG_NF_CONNTRACK) +#if !IS_ENABLED(CONFIG_NF_NAT) /* Previously seen (loopback)? Ignore. Do this before fragment check. */ if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct)) diff --git a/net/ipv4/netfilter/nf_log_arp.c b/net/ipv4/netfilter/nf_log_arp.c new file mode 100644 index 000000000000..ccfc78db12ee --- /dev/null +++ b/net/ipv4/netfilter/nf_log_arp.c @@ -0,0 +1,149 @@ +/* + * (C) 2014 by Pablo Neira Ayuso <pablo@netfilter.org> + * + * Based on code from ebt_log from: + * + * Bart De Schuymer <bdschuym@pandora.be> + * Harald Welte <laforge@netfilter.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/skbuff.h> +#include <linux/if_arp.h> +#include <linux/ip.h> +#include <net/route.h> + +#include <linux/netfilter.h> +#include <linux/netfilter/xt_LOG.h> +#include <net/netfilter/nf_log.h> + +static struct nf_loginfo default_loginfo = { + .type = NF_LOG_TYPE_LOG, + .u = { + .log = { + .level = 5, + .logflags = NF_LOG_MASK, + }, + }, +}; + +struct arppayload { + unsigned char mac_src[ETH_ALEN]; + unsigned char ip_src[4]; + unsigned char mac_dst[ETH_ALEN]; + unsigned char ip_dst[4]; +}; + +static void dump_arp_packet(struct nf_log_buf *m, + const struct nf_loginfo *info, + const struct sk_buff *skb, unsigned int nhoff) +{ + const struct arphdr *ah; + struct arphdr _arph; + const struct arppayload *ap; + struct arppayload _arpp; + + ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph); + if (ah == NULL) { + nf_log_buf_add(m, "TRUNCATED"); + return; + } + nf_log_buf_add(m, "ARP HTYPE=%d PTYPE=0x%04x OPCODE=%d", + ntohs(ah->ar_hrd), ntohs(ah->ar_pro), ntohs(ah->ar_op)); + + /* If it's for Ethernet and the lengths are OK, then log the ARP + * payload. + */ + if (ah->ar_hrd != htons(1) || + ah->ar_hln != ETH_ALEN || + ah->ar_pln != sizeof(__be32)) + return; + + ap = skb_header_pointer(skb, sizeof(_arph), sizeof(_arpp), &_arpp); + if (ap == NULL) { + nf_log_buf_add(m, " INCOMPLETE [%Zu bytes]", + skb->len - sizeof(_arph)); + return; + } + nf_log_buf_add(m, " MACSRC=%pM IPSRC=%pI4 MACDST=%pM IPDST=%pI4", + ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst); +} + +void nf_log_arp_packet(struct net *net, u_int8_t pf, + unsigned int hooknum, const struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + const struct nf_loginfo *loginfo, + const char *prefix) +{ + struct nf_log_buf *m; + + /* FIXME: Disabled from containers until syslog ns is supported */ + if (!net_eq(net, &init_net)) + return; + + m = nf_log_buf_open(); + + if (!loginfo) + loginfo = &default_loginfo; + + nf_log_dump_packet_common(m, pf, hooknum, skb, in, out, loginfo, + prefix); + dump_arp_packet(m, loginfo, skb, 0); + + nf_log_buf_close(m); +} + +static struct nf_logger nf_arp_logger __read_mostly = { + .name = "nf_log_arp", + .type = NF_LOG_TYPE_LOG, + .logfn = nf_log_arp_packet, + .me = THIS_MODULE, +}; + +static int __net_init nf_log_arp_net_init(struct net *net) +{ + nf_log_set(net, NFPROTO_ARP, &nf_arp_logger); + return 0; +} + +static void __net_exit nf_log_arp_net_exit(struct net *net) +{ + nf_log_unset(net, &nf_arp_logger); +} + +static struct pernet_operations nf_log_arp_net_ops = { + .init = nf_log_arp_net_init, + .exit = nf_log_arp_net_exit, +}; + +static int __init nf_log_arp_init(void) +{ + int ret; + + ret = register_pernet_subsys(&nf_log_arp_net_ops); + if (ret < 0) + return ret; + + nf_log_register(NFPROTO_ARP, &nf_arp_logger); + return 0; +} + +static void __exit nf_log_arp_exit(void) +{ + unregister_pernet_subsys(&nf_log_arp_net_ops); + nf_log_unregister(&nf_arp_logger); +} + +module_init(nf_log_arp_init); +module_exit(nf_log_arp_exit); + +MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); +MODULE_DESCRIPTION("Netfilter ARP packet logging"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NF_LOGGER(3, 0); diff --git a/net/ipv4/netfilter/nf_log_ipv4.c b/net/ipv4/netfilter/nf_log_ipv4.c new file mode 100644 index 000000000000..078bdca1b607 --- /dev/null +++ b/net/ipv4/netfilter/nf_log_ipv4.c @@ -0,0 +1,385 @@ +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/skbuff.h> +#include <linux/if_arp.h> +#include <linux/ip.h> +#include <net/ipv6.h> +#include <net/icmp.h> +#include <net/udp.h> +#include <net/tcp.h> +#include <net/route.h> + +#include <linux/netfilter.h> +#include <linux/netfilter/xt_LOG.h> +#include <net/netfilter/nf_log.h> + +static struct nf_loginfo default_loginfo = { + .type = NF_LOG_TYPE_LOG, + .u = { + .log = { + .level = 5, + .logflags = NF_LOG_MASK, + }, + }, +}; + +/* One level of recursion won't kill us */ +static void dump_ipv4_packet(struct nf_log_buf *m, + const struct nf_loginfo *info, + const struct sk_buff *skb, unsigned int iphoff) +{ + struct iphdr _iph; + const struct iphdr *ih; + unsigned int logflags; + + if (info->type == NF_LOG_TYPE_LOG) + logflags = info->u.log.logflags; + else + logflags = NF_LOG_MASK; + + ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph); + if (ih == NULL) { + nf_log_buf_add(m, "TRUNCATED"); + return; + } + + /* Important fields: + * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */ + /* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */ + nf_log_buf_add(m, "SRC=%pI4 DST=%pI4 ", &ih->saddr, &ih->daddr); + + /* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */ + nf_log_buf_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ", + ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK, + ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id)); + + /* Max length: 6 "CE DF MF " */ + if (ntohs(ih->frag_off) & IP_CE) + nf_log_buf_add(m, "CE "); + if (ntohs(ih->frag_off) & IP_DF) + nf_log_buf_add(m, "DF "); + if (ntohs(ih->frag_off) & IP_MF) + nf_log_buf_add(m, "MF "); + + /* Max length: 11 "FRAG:65535 " */ + if (ntohs(ih->frag_off) & IP_OFFSET) + nf_log_buf_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET); + + if ((logflags & XT_LOG_IPOPT) && + ih->ihl * 4 > sizeof(struct iphdr)) { + const unsigned char *op; + unsigned char _opt[4 * 15 - sizeof(struct iphdr)]; + unsigned int i, optsize; + + optsize = ih->ihl * 4 - sizeof(struct iphdr); + op = skb_header_pointer(skb, iphoff+sizeof(_iph), + optsize, _opt); + if (op == NULL) { + nf_log_buf_add(m, "TRUNCATED"); + return; + } + + /* Max length: 127 "OPT (" 15*4*2chars ") " */ + nf_log_buf_add(m, "OPT ("); + for (i = 0; i < optsize; i++) + nf_log_buf_add(m, "%02X", op[i]); + nf_log_buf_add(m, ") "); + } + + switch (ih->protocol) { + case IPPROTO_TCP: + if (nf_log_dump_tcp_header(m, skb, ih->protocol, + ntohs(ih->frag_off) & IP_OFFSET, + iphoff+ih->ihl*4, logflags)) + return; + break; + case IPPROTO_UDP: + case IPPROTO_UDPLITE: + if (nf_log_dump_udp_header(m, skb, ih->protocol, + ntohs(ih->frag_off) & IP_OFFSET, + iphoff+ih->ihl*4)) + return; + break; + case IPPROTO_ICMP: { + struct icmphdr _icmph; + const struct icmphdr *ich; + static const size_t required_len[NR_ICMP_TYPES+1] + = { [ICMP_ECHOREPLY] = 4, + [ICMP_DEST_UNREACH] + = 8 + sizeof(struct iphdr), + [ICMP_SOURCE_QUENCH] + = 8 + sizeof(struct iphdr), + [ICMP_REDIRECT] + = 8 + sizeof(struct iphdr), + [ICMP_ECHO] = 4, + [ICMP_TIME_EXCEEDED] + = 8 + sizeof(struct iphdr), + [ICMP_PARAMETERPROB] + = 8 + sizeof(struct iphdr), + [ICMP_TIMESTAMP] = 20, + [ICMP_TIMESTAMPREPLY] = 20, + [ICMP_ADDRESS] = 12, + [ICMP_ADDRESSREPLY] = 12 }; + + /* Max length: 11 "PROTO=ICMP " */ + nf_log_buf_add(m, "PROTO=ICMP "); + + if (ntohs(ih->frag_off) & IP_OFFSET) + break; + + /* Max length: 25 "INCOMPLETE [65535 bytes] " */ + ich = skb_header_pointer(skb, iphoff + ih->ihl * 4, + sizeof(_icmph), &_icmph); + if (ich == NULL) { + nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", + skb->len - iphoff - ih->ihl*4); + break; + } + + /* Max length: 18 "TYPE=255 CODE=255 " */ + nf_log_buf_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code); + + /* Max length: 25 "INCOMPLETE [65535 bytes] " */ + if (ich->type <= NR_ICMP_TYPES && + required_len[ich->type] && + skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) { + nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", + skb->len - iphoff - ih->ihl*4); + break; + } + + switch (ich->type) { + case ICMP_ECHOREPLY: + case ICMP_ECHO: + /* Max length: 19 "ID=65535 SEQ=65535 " */ + nf_log_buf_add(m, "ID=%u SEQ=%u ", + ntohs(ich->un.echo.id), + ntohs(ich->un.echo.sequence)); + break; + + case ICMP_PARAMETERPROB: + /* Max length: 14 "PARAMETER=255 " */ + nf_log_buf_add(m, "PARAMETER=%u ", + ntohl(ich->un.gateway) >> 24); + break; + case ICMP_REDIRECT: + /* Max length: 24 "GATEWAY=255.255.255.255 " */ + nf_log_buf_add(m, "GATEWAY=%pI4 ", &ich->un.gateway); + /* Fall through */ + case ICMP_DEST_UNREACH: + case ICMP_SOURCE_QUENCH: + case ICMP_TIME_EXCEEDED: + /* Max length: 3+maxlen */ + if (!iphoff) { /* Only recurse once. */ + nf_log_buf_add(m, "["); + dump_ipv4_packet(m, info, skb, + iphoff + ih->ihl*4+sizeof(_icmph)); + nf_log_buf_add(m, "] "); + } + + /* Max length: 10 "MTU=65535 " */ + if (ich->type == ICMP_DEST_UNREACH && + ich->code == ICMP_FRAG_NEEDED) { + nf_log_buf_add(m, "MTU=%u ", + ntohs(ich->un.frag.mtu)); + } + } + break; + } + /* Max Length */ + case IPPROTO_AH: { + struct ip_auth_hdr _ahdr; + const struct ip_auth_hdr *ah; + + if (ntohs(ih->frag_off) & IP_OFFSET) + break; + + /* Max length: 9 "PROTO=AH " */ + nf_log_buf_add(m, "PROTO=AH "); + + /* Max length: 25 "INCOMPLETE [65535 bytes] " */ + ah = skb_header_pointer(skb, iphoff+ih->ihl*4, + sizeof(_ahdr), &_ahdr); + if (ah == NULL) { + nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", + skb->len - iphoff - ih->ihl*4); + break; + } + + /* Length: 15 "SPI=0xF1234567 " */ + nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi)); + break; + } + case IPPROTO_ESP: { + struct ip_esp_hdr _esph; + const struct ip_esp_hdr *eh; + + /* Max length: 10 "PROTO=ESP " */ + nf_log_buf_add(m, "PROTO=ESP "); + + if (ntohs(ih->frag_off) & IP_OFFSET) + break; + + /* Max length: 25 "INCOMPLETE [65535 bytes] " */ + eh = skb_header_pointer(skb, iphoff+ih->ihl*4, + sizeof(_esph), &_esph); + if (eh == NULL) { + nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", + skb->len - iphoff - ih->ihl*4); + break; + } + + /* Length: 15 "SPI=0xF1234567 " */ + nf_log_buf_add(m, "SPI=0x%x ", ntohl(eh->spi)); + break; + } + /* Max length: 10 "PROTO 255 " */ + default: + nf_log_buf_add(m, "PROTO=%u ", ih->protocol); + } + + /* Max length: 15 "UID=4294967295 " */ + if ((logflags & XT_LOG_UID) && !iphoff) + nf_log_dump_sk_uid_gid(m, skb->sk); + + /* Max length: 16 "MARK=0xFFFFFFFF " */ + if (!iphoff && skb->mark) + nf_log_buf_add(m, "MARK=0x%x ", skb->mark); + + /* Proto Max log string length */ + /* IP: 40+46+6+11+127 = 230 */ + /* TCP: 10+max(25,20+30+13+9+32+11+127) = 252 */ + /* UDP: 10+max(25,20) = 35 */ + /* UDPLITE: 14+max(25,20) = 39 */ + /* ICMP: 11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */ + /* ESP: 10+max(25)+15 = 50 */ + /* AH: 9+max(25)+15 = 49 */ + /* unknown: 10 */ + + /* (ICMP allows recursion one level deep) */ + /* maxlen = IP + ICMP + IP + max(TCP,UDP,ICMP,unknown) */ + /* maxlen = 230+ 91 + 230 + 252 = 803 */ +} + +static void dump_ipv4_mac_header(struct nf_log_buf *m, + const struct nf_loginfo *info, + const struct sk_buff *skb) +{ + struct net_device *dev = skb->dev; + unsigned int logflags = 0; + + if (info->type == NF_LOG_TYPE_LOG) + logflags = info->u.log.logflags; + + if (!(logflags & XT_LOG_MACDECODE)) + goto fallback; + + switch (dev->type) { + case ARPHRD_ETHER: + nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ", + eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, + ntohs(eth_hdr(skb)->h_proto)); + return; + default: + break; + } + +fallback: + nf_log_buf_add(m, "MAC="); + if (dev->hard_header_len && + skb->mac_header != skb->network_header) { + const unsigned char *p = skb_mac_header(skb); + unsigned int i; + + nf_log_buf_add(m, "%02x", *p++); + for (i = 1; i < dev->hard_header_len; i++, p++) + nf_log_buf_add(m, ":%02x", *p); + } + nf_log_buf_add(m, " "); +} + +static void nf_log_ip_packet(struct net *net, u_int8_t pf, + unsigned int hooknum, const struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + const struct nf_loginfo *loginfo, + const char *prefix) +{ + struct nf_log_buf *m; + + /* FIXME: Disabled from containers until syslog ns is supported */ + if (!net_eq(net, &init_net)) + return; + + m = nf_log_buf_open(); + + if (!loginfo) + loginfo = &default_loginfo; + + nf_log_dump_packet_common(m, pf, hooknum, skb, in, + out, loginfo, prefix); + + if (in != NULL) + dump_ipv4_mac_header(m, loginfo, skb); + + dump_ipv4_packet(m, loginfo, skb, 0); + + nf_log_buf_close(m); +} + +static struct nf_logger nf_ip_logger __read_mostly = { + .name = "nf_log_ipv4", + .type = NF_LOG_TYPE_LOG, + .logfn = nf_log_ip_packet, + .me = THIS_MODULE, +}; + +static int __net_init nf_log_ipv4_net_init(struct net *net) +{ + nf_log_set(net, NFPROTO_IPV4, &nf_ip_logger); + return 0; +} + +static void __net_exit nf_log_ipv4_net_exit(struct net *net) +{ + nf_log_unset(net, &nf_ip_logger); +} + +static struct pernet_operations nf_log_ipv4_net_ops = { + .init = nf_log_ipv4_net_init, + .exit = nf_log_ipv4_net_exit, +}; + +static int __init nf_log_ipv4_init(void) +{ + int ret; + + ret = register_pernet_subsys(&nf_log_ipv4_net_ops); + if (ret < 0) + return ret; + + nf_log_register(NFPROTO_IPV4, &nf_ip_logger); + return 0; +} + +static void __exit nf_log_ipv4_exit(void) +{ + unregister_pernet_subsys(&nf_log_ipv4_net_ops); + nf_log_unregister(&nf_ip_logger); +} + +module_init(nf_log_ipv4_init); +module_exit(nf_log_ipv4_exit); + +MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); +MODULE_DESCRIPTION("Netfilter IPv4 packet logging"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NF_LOGGER(AF_INET, 0); diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c index d8b2e14efddc..14f5ccd06337 100644 --- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c @@ -154,6 +154,7 @@ static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb, htons(oldlen), htons(datalen), 1); } +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[], struct nf_nat_range *range) { @@ -169,6 +170,7 @@ static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[], return 0; } +#endif static const struct nf_nat_l3proto nf_nat_l3proto_ipv4 = { .l3proto = NFPROTO_IPV4, @@ -177,7 +179,9 @@ static const struct nf_nat_l3proto nf_nat_l3proto_ipv4 = { .manip_pkt = nf_nat_ipv4_manip_pkt, .csum_update = nf_nat_ipv4_csum_update, .csum_recalc = nf_nat_ipv4_csum_recalc, +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) .nlattr_to_range = nf_nat_ipv4_nlattr_to_range, +#endif #ifdef CONFIG_XFRM .decode_session = nf_nat_ipv4_decode_session, #endif diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c index 690d890111bb..9414923f1e15 100644 --- a/net/ipv4/netfilter/nf_nat_proto_gre.c +++ b/net/ipv4/netfilter/nf_nat_proto_gre.c @@ -124,7 +124,7 @@ static const struct nf_nat_l4proto gre = { .manip_pkt = gre_manip_pkt, .in_range = nf_nat_l4proto_in_range, .unique_tuple = gre_unique_tuple, -#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) .nlattr_to_range = nf_nat_l4proto_nlattr_to_range, #endif }; diff --git a/net/ipv4/netfilter/nf_nat_proto_icmp.c b/net/ipv4/netfilter/nf_nat_proto_icmp.c index eb303471bcf6..4557b4ab8342 100644 --- a/net/ipv4/netfilter/nf_nat_proto_icmp.c +++ b/net/ipv4/netfilter/nf_nat_proto_icmp.c @@ -77,7 +77,7 @@ const struct nf_nat_l4proto nf_nat_l4proto_icmp = { .manip_pkt = icmp_manip_pkt, .in_range = icmp_in_range, .unique_tuple = icmp_unique_tuple, -#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) .nlattr_to_range = nf_nat_l4proto_nlattr_to_range, #endif }; |