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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a54e721970
This is a preparation patch for replacing physindev with physinif on nf_bridge_info structure. We will use dev_get_by_index_rcu to resolve device, when needed, and it requires net to be available. Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com> Reviewed-by: Simon Horman <horms@kernel.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1083 lines
27 KiB
C
1083 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/ip.h>
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#include <net/ipv6.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/tcp.h>
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#include <net/route.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_bridge.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter/xt_LOG.h>
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#include <net/netfilter/nf_log.h>
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static const struct nf_loginfo default_loginfo = {
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.type = NF_LOG_TYPE_LOG,
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.u = {
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.log = {
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.level = LOGLEVEL_NOTICE,
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.logflags = NF_LOG_DEFAULT_MASK,
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},
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},
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};
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struct arppayload {
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unsigned char mac_src[ETH_ALEN];
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unsigned char ip_src[4];
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unsigned char mac_dst[ETH_ALEN];
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unsigned char ip_dst[4];
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};
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/* Guard against containers flooding syslog. */
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static bool nf_log_allowed(const struct net *net)
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{
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return net_eq(net, &init_net) || sysctl_nf_log_all_netns;
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}
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static void nf_log_dump_vlan(struct nf_log_buf *m, const struct sk_buff *skb)
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{
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u16 vid;
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if (!skb_vlan_tag_present(skb))
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return;
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vid = skb_vlan_tag_get(skb);
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nf_log_buf_add(m, "VPROTO=%04x VID=%u ", ntohs(skb->vlan_proto), vid);
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}
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static void noinline_for_stack
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dump_arp_packet(struct nf_log_buf *m,
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const struct nf_loginfo *info,
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const struct sk_buff *skb, unsigned int nhoff)
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{
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const struct arppayload *ap;
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struct arppayload _arpp;
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const struct arphdr *ah;
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unsigned int logflags;
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struct arphdr _arph;
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ah = skb_header_pointer(skb, nhoff, sizeof(_arph), &_arph);
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if (!ah) {
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nf_log_buf_add(m, "TRUNCATED");
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return;
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}
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if (info->type == NF_LOG_TYPE_LOG)
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logflags = info->u.log.logflags;
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else
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logflags = NF_LOG_DEFAULT_MASK;
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if (logflags & NF_LOG_MACDECODE) {
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nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
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eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
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nf_log_dump_vlan(m, skb);
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nf_log_buf_add(m, "MACPROTO=%04x ",
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ntohs(eth_hdr(skb)->h_proto));
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}
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nf_log_buf_add(m, "ARP HTYPE=%d PTYPE=0x%04x OPCODE=%d",
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ntohs(ah->ar_hrd), ntohs(ah->ar_pro), ntohs(ah->ar_op));
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/* If it's for Ethernet and the lengths are OK, then log the ARP
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* payload.
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*/
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if (ah->ar_hrd != htons(ARPHRD_ETHER) ||
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ah->ar_hln != ETH_ALEN ||
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ah->ar_pln != sizeof(__be32))
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return;
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ap = skb_header_pointer(skb, nhoff + sizeof(_arph), sizeof(_arpp), &_arpp);
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if (!ap) {
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nf_log_buf_add(m, " INCOMPLETE [%zu bytes]",
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skb->len - sizeof(_arph));
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return;
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}
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nf_log_buf_add(m, " MACSRC=%pM IPSRC=%pI4 MACDST=%pM IPDST=%pI4",
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ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst);
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}
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static void
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nf_log_dump_packet_common(struct nf_log_buf *m, u8 pf,
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unsigned int hooknum, const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *loginfo, const char *prefix,
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struct net *net)
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{
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const struct net_device *physoutdev __maybe_unused;
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const struct net_device *physindev __maybe_unused;
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nf_log_buf_add(m, KERN_SOH "%c%sIN=%s OUT=%s ",
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'0' + loginfo->u.log.level, prefix,
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in ? in->name : "",
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out ? out->name : "");
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#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
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physindev = nf_bridge_get_physindev(skb, net);
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if (physindev && in != physindev)
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nf_log_buf_add(m, "PHYSIN=%s ", physindev->name);
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physoutdev = nf_bridge_get_physoutdev(skb);
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if (physoutdev && out != physoutdev)
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nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name);
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#endif
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}
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static void nf_log_arp_packet(struct net *net, u_int8_t pf,
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unsigned int hooknum, const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *loginfo,
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const char *prefix)
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{
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struct nf_log_buf *m;
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if (!nf_log_allowed(net))
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return;
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m = nf_log_buf_open();
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if (!loginfo)
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loginfo = &default_loginfo;
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nf_log_dump_packet_common(m, pf, hooknum, skb, in, out, loginfo,
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prefix, net);
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dump_arp_packet(m, loginfo, skb, skb_network_offset(skb));
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nf_log_buf_close(m);
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}
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static struct nf_logger nf_arp_logger __read_mostly = {
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.name = "nf_log_arp",
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.type = NF_LOG_TYPE_LOG,
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.logfn = nf_log_arp_packet,
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.me = THIS_MODULE,
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};
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static void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m,
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struct sock *sk)
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{
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if (!sk || !sk_fullsock(sk) || !net_eq(net, sock_net(sk)))
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return;
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read_lock_bh(&sk->sk_callback_lock);
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if (sk->sk_socket && sk->sk_socket->file) {
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const struct cred *cred = sk->sk_socket->file->f_cred;
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nf_log_buf_add(m, "UID=%u GID=%u ",
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from_kuid_munged(&init_user_ns, cred->fsuid),
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from_kgid_munged(&init_user_ns, cred->fsgid));
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}
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read_unlock_bh(&sk->sk_callback_lock);
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}
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static noinline_for_stack int
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nf_log_dump_tcp_header(struct nf_log_buf *m,
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const struct sk_buff *skb,
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u8 proto, int fragment,
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unsigned int offset,
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unsigned int logflags)
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{
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struct tcphdr _tcph;
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const struct tcphdr *th;
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/* Max length: 10 "PROTO=TCP " */
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nf_log_buf_add(m, "PROTO=TCP ");
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if (fragment)
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return 0;
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/* Max length: 25 "INCOMPLETE [65535 bytes] " */
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th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
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if (!th) {
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nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
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return 1;
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}
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/* Max length: 20 "SPT=65535 DPT=65535 " */
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nf_log_buf_add(m, "SPT=%u DPT=%u ",
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ntohs(th->source), ntohs(th->dest));
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/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
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if (logflags & NF_LOG_TCPSEQ) {
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nf_log_buf_add(m, "SEQ=%u ACK=%u ",
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ntohl(th->seq), ntohl(th->ack_seq));
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}
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/* Max length: 13 "WINDOW=65535 " */
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nf_log_buf_add(m, "WINDOW=%u ", ntohs(th->window));
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/* Max length: 9 "RES=0x3C " */
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nf_log_buf_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) &
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TCP_RESERVED_BITS) >> 22));
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/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
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if (th->cwr)
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nf_log_buf_add(m, "CWR ");
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if (th->ece)
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nf_log_buf_add(m, "ECE ");
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if (th->urg)
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nf_log_buf_add(m, "URG ");
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if (th->ack)
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nf_log_buf_add(m, "ACK ");
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if (th->psh)
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nf_log_buf_add(m, "PSH ");
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if (th->rst)
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nf_log_buf_add(m, "RST ");
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if (th->syn)
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nf_log_buf_add(m, "SYN ");
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if (th->fin)
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nf_log_buf_add(m, "FIN ");
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/* Max length: 11 "URGP=65535 " */
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nf_log_buf_add(m, "URGP=%u ", ntohs(th->urg_ptr));
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if ((logflags & NF_LOG_TCPOPT) && th->doff * 4 > sizeof(struct tcphdr)) {
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unsigned int optsize = th->doff * 4 - sizeof(struct tcphdr);
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u8 _opt[60 - sizeof(struct tcphdr)];
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unsigned int i;
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const u8 *op;
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op = skb_header_pointer(skb, offset + sizeof(struct tcphdr),
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optsize, _opt);
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if (!op) {
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nf_log_buf_add(m, "OPT (TRUNCATED)");
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return 1;
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}
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/* Max length: 127 "OPT (" 15*4*2chars ") " */
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nf_log_buf_add(m, "OPT (");
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for (i = 0; i < optsize; i++)
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nf_log_buf_add(m, "%02X", op[i]);
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nf_log_buf_add(m, ") ");
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}
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return 0;
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}
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static noinline_for_stack int
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nf_log_dump_udp_header(struct nf_log_buf *m,
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const struct sk_buff *skb,
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u8 proto, int fragment,
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unsigned int offset)
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{
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struct udphdr _udph;
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const struct udphdr *uh;
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if (proto == IPPROTO_UDP)
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/* Max length: 10 "PROTO=UDP " */
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nf_log_buf_add(m, "PROTO=UDP ");
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else /* Max length: 14 "PROTO=UDPLITE " */
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nf_log_buf_add(m, "PROTO=UDPLITE ");
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if (fragment)
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goto out;
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/* Max length: 25 "INCOMPLETE [65535 bytes] " */
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uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
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if (!uh) {
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nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
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return 1;
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}
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/* Max length: 20 "SPT=65535 DPT=65535 " */
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nf_log_buf_add(m, "SPT=%u DPT=%u LEN=%u ",
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ntohs(uh->source), ntohs(uh->dest), ntohs(uh->len));
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out:
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return 0;
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}
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/* One level of recursion won't kill us */
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static noinline_for_stack void
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dump_ipv4_packet(struct net *net, struct nf_log_buf *m,
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const struct nf_loginfo *info,
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const struct sk_buff *skb, unsigned int iphoff)
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{
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const struct iphdr *ih;
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unsigned int logflags;
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struct iphdr _iph;
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if (info->type == NF_LOG_TYPE_LOG)
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logflags = info->u.log.logflags;
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else
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logflags = NF_LOG_DEFAULT_MASK;
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ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
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if (!ih) {
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nf_log_buf_add(m, "TRUNCATED");
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return;
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}
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/* Important fields:
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* TOS, len, DF/MF, fragment offset, TTL, src, dst, options.
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* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 "
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*/
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nf_log_buf_add(m, "SRC=%pI4 DST=%pI4 ", &ih->saddr, &ih->daddr);
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/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
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nf_log_buf_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
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iph_totlen(skb, ih), ih->tos & IPTOS_TOS_MASK,
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ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
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/* Max length: 6 "CE DF MF " */
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if (ntohs(ih->frag_off) & IP_CE)
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nf_log_buf_add(m, "CE ");
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if (ntohs(ih->frag_off) & IP_DF)
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nf_log_buf_add(m, "DF ");
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if (ntohs(ih->frag_off) & IP_MF)
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nf_log_buf_add(m, "MF ");
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/* Max length: 11 "FRAG:65535 " */
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if (ntohs(ih->frag_off) & IP_OFFSET)
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nf_log_buf_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
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if ((logflags & NF_LOG_IPOPT) &&
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ih->ihl * 4 > sizeof(struct iphdr)) {
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unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
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const unsigned char *op;
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unsigned int i, optsize;
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optsize = ih->ihl * 4 - sizeof(struct iphdr);
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op = skb_header_pointer(skb, iphoff + sizeof(_iph),
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optsize, _opt);
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if (!op) {
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nf_log_buf_add(m, "TRUNCATED");
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return;
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}
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/* Max length: 127 "OPT (" 15*4*2chars ") " */
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nf_log_buf_add(m, "OPT (");
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for (i = 0; i < optsize; i++)
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nf_log_buf_add(m, "%02X", op[i]);
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nf_log_buf_add(m, ") ");
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}
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switch (ih->protocol) {
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case IPPROTO_TCP:
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if (nf_log_dump_tcp_header(m, skb, ih->protocol,
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ntohs(ih->frag_off) & IP_OFFSET,
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iphoff + ih->ihl * 4, logflags))
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return;
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break;
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case IPPROTO_UDP:
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case IPPROTO_UDPLITE:
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if (nf_log_dump_udp_header(m, skb, ih->protocol,
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ntohs(ih->frag_off) & IP_OFFSET,
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iphoff + ih->ihl * 4))
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return;
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break;
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case IPPROTO_ICMP: {
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static const size_t required_len[NR_ICMP_TYPES + 1] = {
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[ICMP_ECHOREPLY] = 4,
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[ICMP_DEST_UNREACH] = 8 + sizeof(struct iphdr),
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[ICMP_SOURCE_QUENCH] = 8 + sizeof(struct iphdr),
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[ICMP_REDIRECT] = 8 + sizeof(struct iphdr),
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[ICMP_ECHO] = 4,
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[ICMP_TIME_EXCEEDED] = 8 + sizeof(struct iphdr),
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[ICMP_PARAMETERPROB] = 8 + sizeof(struct iphdr),
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[ICMP_TIMESTAMP] = 20,
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[ICMP_TIMESTAMPREPLY] = 20,
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[ICMP_ADDRESS] = 12,
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[ICMP_ADDRESSREPLY] = 12 };
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const struct icmphdr *ich;
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struct icmphdr _icmph;
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/* Max length: 11 "PROTO=ICMP " */
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nf_log_buf_add(m, "PROTO=ICMP ");
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if (ntohs(ih->frag_off) & IP_OFFSET)
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break;
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/* Max length: 25 "INCOMPLETE [65535 bytes] " */
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ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
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sizeof(_icmph), &_icmph);
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if (!ich) {
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nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
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skb->len - iphoff - ih->ihl * 4);
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break;
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}
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/* Max length: 18 "TYPE=255 CODE=255 " */
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nf_log_buf_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);
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/* Max length: 25 "INCOMPLETE [65535 bytes] " */
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if (ich->type <= NR_ICMP_TYPES &&
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required_len[ich->type] &&
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skb->len - iphoff - ih->ihl * 4 < required_len[ich->type]) {
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nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
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skb->len - iphoff - ih->ihl * 4);
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break;
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}
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switch (ich->type) {
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case ICMP_ECHOREPLY:
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case ICMP_ECHO:
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/* Max length: 19 "ID=65535 SEQ=65535 " */
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nf_log_buf_add(m, "ID=%u SEQ=%u ",
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ntohs(ich->un.echo.id),
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ntohs(ich->un.echo.sequence));
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break;
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case ICMP_PARAMETERPROB:
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/* Max length: 14 "PARAMETER=255 " */
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nf_log_buf_add(m, "PARAMETER=%u ",
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ntohl(ich->un.gateway) >> 24);
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break;
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case ICMP_REDIRECT:
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/* Max length: 24 "GATEWAY=255.255.255.255 " */
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nf_log_buf_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
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fallthrough;
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case ICMP_DEST_UNREACH:
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case ICMP_SOURCE_QUENCH:
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case ICMP_TIME_EXCEEDED:
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/* Max length: 3+maxlen */
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if (!iphoff) { /* Only recurse once. */
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nf_log_buf_add(m, "[");
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dump_ipv4_packet(net, m, info, skb,
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iphoff + ih->ihl * 4 + sizeof(_icmph));
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nf_log_buf_add(m, "] ");
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}
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|
|
/* 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: {
|
|
const struct ip_auth_hdr *ah;
|
|
struct ip_auth_hdr _ahdr;
|
|
|
|
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) {
|
|
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: {
|
|
const struct ip_esp_hdr *eh;
|
|
struct ip_esp_hdr _esph;
|
|
|
|
/* 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) {
|
|
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 & NF_LOG_UID) && !iphoff)
|
|
nf_log_dump_sk_uid_gid(net, 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 noinline_for_stack void
|
|
dump_ipv6_packet(struct net *net, struct nf_log_buf *m,
|
|
const struct nf_loginfo *info,
|
|
const struct sk_buff *skb, unsigned int ip6hoff,
|
|
int recurse)
|
|
{
|
|
const struct ipv6hdr *ih;
|
|
unsigned int hdrlen = 0;
|
|
unsigned int logflags;
|
|
struct ipv6hdr _ip6h;
|
|
unsigned int ptr;
|
|
u8 currenthdr;
|
|
int fragment;
|
|
|
|
if (info->type == NF_LOG_TYPE_LOG)
|
|
logflags = info->u.log.logflags;
|
|
else
|
|
logflags = NF_LOG_DEFAULT_MASK;
|
|
|
|
ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
|
|
if (!ih) {
|
|
nf_log_buf_add(m, "TRUNCATED");
|
|
return;
|
|
}
|
|
|
|
/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
|
|
nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
|
|
|
|
/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
|
|
nf_log_buf_add(m, "LEN=%zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
|
|
ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
|
|
(ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
|
|
ih->hop_limit,
|
|
(ntohl(*(__be32 *)ih) & 0x000fffff));
|
|
|
|
fragment = 0;
|
|
ptr = ip6hoff + sizeof(struct ipv6hdr);
|
|
currenthdr = ih->nexthdr;
|
|
while (currenthdr != NEXTHDR_NONE && nf_ip6_ext_hdr(currenthdr)) {
|
|
struct ipv6_opt_hdr _hdr;
|
|
const struct ipv6_opt_hdr *hp;
|
|
|
|
hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
|
|
if (!hp) {
|
|
nf_log_buf_add(m, "TRUNCATED");
|
|
return;
|
|
}
|
|
|
|
/* Max length: 48 "OPT (...) " */
|
|
if (logflags & NF_LOG_IPOPT)
|
|
nf_log_buf_add(m, "OPT ( ");
|
|
|
|
switch (currenthdr) {
|
|
case IPPROTO_FRAGMENT: {
|
|
struct frag_hdr _fhdr;
|
|
const struct frag_hdr *fh;
|
|
|
|
nf_log_buf_add(m, "FRAG:");
|
|
fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
|
|
&_fhdr);
|
|
if (!fh) {
|
|
nf_log_buf_add(m, "TRUNCATED ");
|
|
return;
|
|
}
|
|
|
|
/* Max length: 6 "65535 " */
|
|
nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
|
|
|
|
/* Max length: 11 "INCOMPLETE " */
|
|
if (fh->frag_off & htons(0x0001))
|
|
nf_log_buf_add(m, "INCOMPLETE ");
|
|
|
|
nf_log_buf_add(m, "ID:%08x ",
|
|
ntohl(fh->identification));
|
|
|
|
if (ntohs(fh->frag_off) & 0xFFF8)
|
|
fragment = 1;
|
|
|
|
hdrlen = 8;
|
|
break;
|
|
}
|
|
case IPPROTO_DSTOPTS:
|
|
case IPPROTO_ROUTING:
|
|
case IPPROTO_HOPOPTS:
|
|
if (fragment) {
|
|
if (logflags & NF_LOG_IPOPT)
|
|
nf_log_buf_add(m, ")");
|
|
return;
|
|
}
|
|
hdrlen = ipv6_optlen(hp);
|
|
break;
|
|
/* Max Length */
|
|
case IPPROTO_AH:
|
|
if (logflags & NF_LOG_IPOPT) {
|
|
struct ip_auth_hdr _ahdr;
|
|
const struct ip_auth_hdr *ah;
|
|
|
|
/* Max length: 3 "AH " */
|
|
nf_log_buf_add(m, "AH ");
|
|
|
|
if (fragment) {
|
|
nf_log_buf_add(m, ")");
|
|
return;
|
|
}
|
|
|
|
ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
|
|
&_ahdr);
|
|
if (!ah) {
|
|
/* Max length: 26 "INCOMPLETE [65535 bytes] )" */
|
|
nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
|
|
skb->len - ptr);
|
|
return;
|
|
}
|
|
|
|
/* Length: 15 "SPI=0xF1234567 */
|
|
nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
|
|
}
|
|
|
|
hdrlen = ipv6_authlen(hp);
|
|
break;
|
|
case IPPROTO_ESP:
|
|
if (logflags & NF_LOG_IPOPT) {
|
|
struct ip_esp_hdr _esph;
|
|
const struct ip_esp_hdr *eh;
|
|
|
|
/* Max length: 4 "ESP " */
|
|
nf_log_buf_add(m, "ESP ");
|
|
|
|
if (fragment) {
|
|
nf_log_buf_add(m, ")");
|
|
return;
|
|
}
|
|
|
|
/* Max length: 26 "INCOMPLETE [65535 bytes] )" */
|
|
eh = skb_header_pointer(skb, ptr, sizeof(_esph),
|
|
&_esph);
|
|
if (!eh) {
|
|
nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
|
|
skb->len - ptr);
|
|
return;
|
|
}
|
|
|
|
/* Length: 16 "SPI=0xF1234567 )" */
|
|
nf_log_buf_add(m, "SPI=0x%x )",
|
|
ntohl(eh->spi));
|
|
}
|
|
return;
|
|
default:
|
|
/* Max length: 20 "Unknown Ext Hdr 255" */
|
|
nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
|
|
return;
|
|
}
|
|
if (logflags & NF_LOG_IPOPT)
|
|
nf_log_buf_add(m, ") ");
|
|
|
|
currenthdr = hp->nexthdr;
|
|
ptr += hdrlen;
|
|
}
|
|
|
|
switch (currenthdr) {
|
|
case IPPROTO_TCP:
|
|
if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment,
|
|
ptr, logflags))
|
|
return;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr))
|
|
return;
|
|
break;
|
|
case IPPROTO_ICMPV6: {
|
|
struct icmp6hdr _icmp6h;
|
|
const struct icmp6hdr *ic;
|
|
|
|
/* Max length: 13 "PROTO=ICMPv6 " */
|
|
nf_log_buf_add(m, "PROTO=ICMPv6 ");
|
|
|
|
if (fragment)
|
|
break;
|
|
|
|
/* Max length: 25 "INCOMPLETE [65535 bytes] " */
|
|
ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
|
|
if (!ic) {
|
|
nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
|
|
skb->len - ptr);
|
|
return;
|
|
}
|
|
|
|
/* Max length: 18 "TYPE=255 CODE=255 " */
|
|
nf_log_buf_add(m, "TYPE=%u CODE=%u ",
|
|
ic->icmp6_type, ic->icmp6_code);
|
|
|
|
switch (ic->icmp6_type) {
|
|
case ICMPV6_ECHO_REQUEST:
|
|
case ICMPV6_ECHO_REPLY:
|
|
/* Max length: 19 "ID=65535 SEQ=65535 " */
|
|
nf_log_buf_add(m, "ID=%u SEQ=%u ",
|
|
ntohs(ic->icmp6_identifier),
|
|
ntohs(ic->icmp6_sequence));
|
|
break;
|
|
case ICMPV6_MGM_QUERY:
|
|
case ICMPV6_MGM_REPORT:
|
|
case ICMPV6_MGM_REDUCTION:
|
|
break;
|
|
|
|
case ICMPV6_PARAMPROB:
|
|
/* Max length: 17 "POINTER=ffffffff " */
|
|
nf_log_buf_add(m, "POINTER=%08x ",
|
|
ntohl(ic->icmp6_pointer));
|
|
fallthrough;
|
|
case ICMPV6_DEST_UNREACH:
|
|
case ICMPV6_PKT_TOOBIG:
|
|
case ICMPV6_TIME_EXCEED:
|
|
/* Max length: 3+maxlen */
|
|
if (recurse) {
|
|
nf_log_buf_add(m, "[");
|
|
dump_ipv6_packet(net, m, info, skb,
|
|
ptr + sizeof(_icmp6h), 0);
|
|
nf_log_buf_add(m, "] ");
|
|
}
|
|
|
|
/* Max length: 10 "MTU=65535 " */
|
|
if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) {
|
|
nf_log_buf_add(m, "MTU=%u ",
|
|
ntohl(ic->icmp6_mtu));
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
/* Max length: 10 "PROTO=255 " */
|
|
default:
|
|
nf_log_buf_add(m, "PROTO=%u ", currenthdr);
|
|
}
|
|
|
|
/* Max length: 15 "UID=4294967295 " */
|
|
if ((logflags & NF_LOG_UID) && recurse)
|
|
nf_log_dump_sk_uid_gid(net, m, skb->sk);
|
|
|
|
/* Max length: 16 "MARK=0xFFFFFFFF " */
|
|
if (recurse && skb->mark)
|
|
nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
|
|
}
|
|
|
|
static void dump_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 & NF_LOG_MACDECODE))
|
|
goto fallback;
|
|
|
|
switch (dev->type) {
|
|
case ARPHRD_ETHER:
|
|
nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
|
|
eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
|
|
nf_log_dump_vlan(m, skb);
|
|
nf_log_buf_add(m, "MACPROTO=%04x ",
|
|
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;
|
|
|
|
if (dev->type == ARPHRD_SIT) {
|
|
p -= ETH_HLEN;
|
|
|
|
if (p < skb->head)
|
|
p = NULL;
|
|
}
|
|
|
|
if (p) {
|
|
nf_log_buf_add(m, "%02x", *p++);
|
|
for (i = 1; i < dev->hard_header_len; i++)
|
|
nf_log_buf_add(m, ":%02x", *p++);
|
|
}
|
|
|
|
if (dev->type == ARPHRD_SIT) {
|
|
const struct iphdr *iph =
|
|
(struct iphdr *)skb_mac_header(skb);
|
|
|
|
nf_log_buf_add(m, " TUNNEL=%pI4->%pI4", &iph->saddr,
|
|
&iph->daddr);
|
|
}
|
|
}
|
|
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;
|
|
|
|
if (!nf_log_allowed(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, net);
|
|
|
|
if (in)
|
|
dump_mac_header(m, loginfo, skb);
|
|
|
|
dump_ipv4_packet(net, m, loginfo, skb, skb_network_offset(skb));
|
|
|
|
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 void nf_log_ip6_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;
|
|
|
|
if (!nf_log_allowed(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, net);
|
|
|
|
if (in)
|
|
dump_mac_header(m, loginfo, skb);
|
|
|
|
dump_ipv6_packet(net, m, loginfo, skb, skb_network_offset(skb), 1);
|
|
|
|
nf_log_buf_close(m);
|
|
}
|
|
|
|
static struct nf_logger nf_ip6_logger __read_mostly = {
|
|
.name = "nf_log_ipv6",
|
|
.type = NF_LOG_TYPE_LOG,
|
|
.logfn = nf_log_ip6_packet,
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static void nf_log_unknown_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;
|
|
|
|
if (!nf_log_allowed(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, net);
|
|
|
|
dump_mac_header(m, loginfo, skb);
|
|
|
|
nf_log_buf_close(m);
|
|
}
|
|
|
|
static void nf_log_netdev_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)
|
|
{
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
nf_log_ip_packet(net, pf, hooknum, skb, in, out, loginfo, prefix);
|
|
break;
|
|
case htons(ETH_P_IPV6):
|
|
nf_log_ip6_packet(net, pf, hooknum, skb, in, out, loginfo, prefix);
|
|
break;
|
|
case htons(ETH_P_ARP):
|
|
case htons(ETH_P_RARP):
|
|
nf_log_arp_packet(net, pf, hooknum, skb, in, out, loginfo, prefix);
|
|
break;
|
|
default:
|
|
nf_log_unknown_packet(net, pf, hooknum, skb,
|
|
in, out, loginfo, prefix);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static struct nf_logger nf_netdev_logger __read_mostly = {
|
|
.name = "nf_log_netdev",
|
|
.type = NF_LOG_TYPE_LOG,
|
|
.logfn = nf_log_netdev_packet,
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static struct nf_logger nf_bridge_logger __read_mostly = {
|
|
.name = "nf_log_bridge",
|
|
.type = NF_LOG_TYPE_LOG,
|
|
.logfn = nf_log_netdev_packet,
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __net_init nf_log_syslog_net_init(struct net *net)
|
|
{
|
|
int ret = nf_log_set(net, NFPROTO_IPV4, &nf_ip_logger);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = nf_log_set(net, NFPROTO_ARP, &nf_arp_logger);
|
|
if (ret)
|
|
goto err1;
|
|
|
|
ret = nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger);
|
|
if (ret)
|
|
goto err2;
|
|
|
|
ret = nf_log_set(net, NFPROTO_NETDEV, &nf_netdev_logger);
|
|
if (ret)
|
|
goto err3;
|
|
|
|
ret = nf_log_set(net, NFPROTO_BRIDGE, &nf_bridge_logger);
|
|
if (ret)
|
|
goto err4;
|
|
return 0;
|
|
err4:
|
|
nf_log_unset(net, &nf_netdev_logger);
|
|
err3:
|
|
nf_log_unset(net, &nf_ip6_logger);
|
|
err2:
|
|
nf_log_unset(net, &nf_arp_logger);
|
|
err1:
|
|
nf_log_unset(net, &nf_ip_logger);
|
|
return ret;
|
|
}
|
|
|
|
static void __net_exit nf_log_syslog_net_exit(struct net *net)
|
|
{
|
|
nf_log_unset(net, &nf_ip_logger);
|
|
nf_log_unset(net, &nf_arp_logger);
|
|
nf_log_unset(net, &nf_ip6_logger);
|
|
nf_log_unset(net, &nf_netdev_logger);
|
|
nf_log_unset(net, &nf_bridge_logger);
|
|
}
|
|
|
|
static struct pernet_operations nf_log_syslog_net_ops = {
|
|
.init = nf_log_syslog_net_init,
|
|
.exit = nf_log_syslog_net_exit,
|
|
};
|
|
|
|
static int __init nf_log_syslog_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_pernet_subsys(&nf_log_syslog_net_ops);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = nf_log_register(NFPROTO_IPV4, &nf_ip_logger);
|
|
if (ret < 0)
|
|
goto err1;
|
|
|
|
ret = nf_log_register(NFPROTO_ARP, &nf_arp_logger);
|
|
if (ret < 0)
|
|
goto err2;
|
|
|
|
ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger);
|
|
if (ret < 0)
|
|
goto err3;
|
|
|
|
ret = nf_log_register(NFPROTO_NETDEV, &nf_netdev_logger);
|
|
if (ret < 0)
|
|
goto err4;
|
|
|
|
ret = nf_log_register(NFPROTO_BRIDGE, &nf_bridge_logger);
|
|
if (ret < 0)
|
|
goto err5;
|
|
|
|
return 0;
|
|
err5:
|
|
nf_log_unregister(&nf_netdev_logger);
|
|
err4:
|
|
nf_log_unregister(&nf_ip6_logger);
|
|
err3:
|
|
nf_log_unregister(&nf_arp_logger);
|
|
err2:
|
|
nf_log_unregister(&nf_ip_logger);
|
|
err1:
|
|
pr_err("failed to register logger\n");
|
|
unregister_pernet_subsys(&nf_log_syslog_net_ops);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit nf_log_syslog_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&nf_log_syslog_net_ops);
|
|
nf_log_unregister(&nf_ip_logger);
|
|
nf_log_unregister(&nf_arp_logger);
|
|
nf_log_unregister(&nf_ip6_logger);
|
|
nf_log_unregister(&nf_netdev_logger);
|
|
nf_log_unregister(&nf_bridge_logger);
|
|
}
|
|
|
|
module_init(nf_log_syslog_init);
|
|
module_exit(nf_log_syslog_exit);
|
|
|
|
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
|
|
MODULE_DESCRIPTION("Netfilter syslog packet logging");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("nf_log_arp");
|
|
MODULE_ALIAS("nf_log_bridge");
|
|
MODULE_ALIAS("nf_log_ipv4");
|
|
MODULE_ALIAS("nf_log_ipv6");
|
|
MODULE_ALIAS("nf_log_netdev");
|
|
MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 0);
|
|
MODULE_ALIAS_NF_LOGGER(AF_INET, 0);
|
|
MODULE_ALIAS_NF_LOGGER(3, 0);
|
|
MODULE_ALIAS_NF_LOGGER(5, 0); /* NFPROTO_NETDEV */
|
|
MODULE_ALIAS_NF_LOGGER(AF_INET6, 0);
|