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![Michal Kubeček](/assets/img/avatar_default.png)
In dump_ipv6_packet(), the "recurse" parameter is zero only if dumping contents of a packet embedded into an ICMPv6 error message. Therefore we want to log packet mark if recurse is non-zero, not when it is zero. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
975 lines
23 KiB
C
975 lines
23 KiB
C
/*
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* This is a module which is used for logging packets.
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*/
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/x_tables.h>
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#include <linux/netfilter/xt_LOG.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <net/netfilter/nf_log.h>
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#include <net/netfilter/xt_log.h>
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static 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 = 5,
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.logflags = NF_LOG_MASK,
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},
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},
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};
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static int dump_udp_header(struct sbuff *m, const struct sk_buff *skb,
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u8 proto, int fragment, 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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sb_add(m, "PROTO=UDP ");
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else /* Max length: 14 "PROTO=UDPLITE " */
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sb_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 == NULL) {
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sb_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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sb_add(m, "SPT=%u DPT=%u LEN=%u ", ntohs(uh->source), ntohs(uh->dest),
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ntohs(uh->len));
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out:
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return 0;
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}
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static int dump_tcp_header(struct sbuff *m, const struct sk_buff *skb,
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u8 proto, int fragment, 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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sb_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 == NULL) {
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sb_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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sb_add(m, "SPT=%u DPT=%u ", ntohs(th->source), ntohs(th->dest));
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/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
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if (logflags & XT_LOG_TCPSEQ)
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sb_add(m, "SEQ=%u ACK=%u ", ntohl(th->seq), ntohl(th->ack_seq));
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/* Max length: 13 "WINDOW=65535 " */
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sb_add(m, "WINDOW=%u ", ntohs(th->window));
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/* Max length: 9 "RES=0x3C " */
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sb_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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sb_add(m, "CWR ");
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if (th->ece)
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sb_add(m, "ECE ");
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if (th->urg)
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sb_add(m, "URG ");
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if (th->ack)
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sb_add(m, "ACK ");
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if (th->psh)
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sb_add(m, "PSH ");
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if (th->rst)
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sb_add(m, "RST ");
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if (th->syn)
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sb_add(m, "SYN ");
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if (th->fin)
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sb_add(m, "FIN ");
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/* Max length: 11 "URGP=65535 " */
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sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
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if ((logflags & XT_LOG_TCPOPT) && th->doff*4 > sizeof(struct tcphdr)) {
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u_int8_t _opt[60 - sizeof(struct tcphdr)];
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const u_int8_t *op;
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unsigned int i;
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unsigned int optsize = th->doff*4 - sizeof(struct tcphdr);
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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 == NULL) {
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sb_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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sb_add(m, "OPT (");
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for (i = 0; i < optsize; i++)
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sb_add(m, "%02X", op[i]);
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sb_add(m, ") ");
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}
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return 0;
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}
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static void dump_sk_uid_gid(struct sbuff *m, struct sock *sk)
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{
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if (!sk || sk->sk_state == TCP_TIME_WAIT)
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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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sb_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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/* One level of recursion won't kill us */
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static void dump_ipv4_packet(struct sbuff *m,
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const struct nf_loginfo *info,
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const struct sk_buff *skb,
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unsigned int iphoff)
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{
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struct iphdr _iph;
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const struct iphdr *ih;
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unsigned int logflags;
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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_MASK;
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ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
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if (ih == NULL) {
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sb_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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sb_add(m, "SRC=%pI4 DST=%pI4 ",
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&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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sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
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ntohs(ih->tot_len), 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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sb_add(m, "CE ");
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if (ntohs(ih->frag_off) & IP_DF)
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sb_add(m, "DF ");
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if (ntohs(ih->frag_off) & IP_MF)
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sb_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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sb_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
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if ((logflags & XT_LOG_IPOPT) &&
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ih->ihl * 4 > sizeof(struct iphdr)) {
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const unsigned char *op;
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unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
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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 == NULL) {
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sb_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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sb_add(m, "OPT (");
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for (i = 0; i < optsize; i++)
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sb_add(m, "%02X", op[i]);
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sb_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 (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 (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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struct icmphdr _icmph;
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const struct icmphdr *ich;
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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]
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= 8 + sizeof(struct iphdr),
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[ICMP_SOURCE_QUENCH]
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= 8 + sizeof(struct iphdr),
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[ICMP_REDIRECT]
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= 8 + sizeof(struct iphdr),
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[ICMP_ECHO] = 4,
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[ICMP_TIME_EXCEEDED]
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= 8 + sizeof(struct iphdr),
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[ICMP_PARAMETERPROB]
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= 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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/* Max length: 11 "PROTO=ICMP " */
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sb_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 == NULL) {
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sb_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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sb_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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sb_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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sb_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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sb_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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sb_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
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/* Fall through */
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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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sb_add(m, "[");
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dump_ipv4_packet(m, info, skb,
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iphoff + ih->ihl*4+sizeof(_icmph));
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sb_add(m, "] ");
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}
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/* Max length: 10 "MTU=65535 " */
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if (ich->type == ICMP_DEST_UNREACH &&
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ich->code == ICMP_FRAG_NEEDED)
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sb_add(m, "MTU=%u ", ntohs(ich->un.frag.mtu));
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}
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break;
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}
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/* Max Length */
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case IPPROTO_AH: {
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struct ip_auth_hdr _ahdr;
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const struct ip_auth_hdr *ah;
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if (ntohs(ih->frag_off) & IP_OFFSET)
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break;
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/* Max length: 9 "PROTO=AH " */
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sb_add(m, "PROTO=AH ");
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/* Max length: 25 "INCOMPLETE [65535 bytes] " */
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ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
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sizeof(_ahdr), &_ahdr);
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if (ah == NULL) {
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sb_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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/* Length: 15 "SPI=0xF1234567 " */
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sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
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break;
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}
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case IPPROTO_ESP: {
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struct ip_esp_hdr _esph;
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const struct ip_esp_hdr *eh;
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/* Max length: 10 "PROTO=ESP " */
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sb_add(m, "PROTO=ESP ");
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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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eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
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sizeof(_esph), &_esph);
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if (eh == NULL) {
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sb_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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/* Length: 15 "SPI=0xF1234567 " */
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sb_add(m, "SPI=0x%x ", ntohl(eh->spi));
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break;
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}
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/* Max length: 10 "PROTO 255 " */
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default:
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sb_add(m, "PROTO=%u ", ih->protocol);
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}
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/* Max length: 15 "UID=4294967295 " */
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if ((logflags & XT_LOG_UID) && !iphoff)
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dump_sk_uid_gid(m, skb->sk);
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/* Max length: 16 "MARK=0xFFFFFFFF " */
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if (!iphoff && skb->mark)
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sb_add(m, "MARK=0x%x ", skb->mark);
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/* Proto Max log string length */
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/* IP: 40+46+6+11+127 = 230 */
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/* TCP: 10+max(25,20+30+13+9+32+11+127) = 252 */
|
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/* UDP: 10+max(25,20) = 35 */
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/* UDPLITE: 14+max(25,20) = 39 */
|
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/* ICMP: 11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
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/* ESP: 10+max(25)+15 = 50 */
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/* AH: 9+max(25)+15 = 49 */
|
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/* unknown: 10 */
|
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|
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/* (ICMP allows recursion one level deep) */
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/* maxlen = IP + ICMP + IP + max(TCP,UDP,ICMP,unknown) */
|
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/* maxlen = 230+ 91 + 230 + 252 = 803 */
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}
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|
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static void dump_ipv4_mac_header(struct sbuff *m,
|
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const struct nf_loginfo *info,
|
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const struct sk_buff *skb)
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{
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struct net_device *dev = skb->dev;
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unsigned int logflags = 0;
|
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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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|
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if (!(logflags & XT_LOG_MACDECODE))
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goto fallback;
|
|
|
|
switch (dev->type) {
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|
case ARPHRD_ETHER:
|
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sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
|
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eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
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ntohs(eth_hdr(skb)->h_proto));
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return;
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default:
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break;
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}
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|
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fallback:
|
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sb_add(m, "MAC=");
|
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if (dev->hard_header_len &&
|
|
skb->mac_header != skb->network_header) {
|
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const unsigned char *p = skb_mac_header(skb);
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unsigned int i;
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|
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sb_add(m, "%02x", *p++);
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for (i = 1; i < dev->hard_header_len; i++, p++)
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|
sb_add(m, ":%02x", *p);
|
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}
|
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sb_add(m, " ");
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|
}
|
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|
|
static void
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log_packet_common(struct sbuff *m,
|
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u_int8_t pf,
|
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unsigned int hooknum,
|
|
const struct sk_buff *skb,
|
|
const struct net_device *in,
|
|
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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|
sb_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 : "");
|
|
#ifdef CONFIG_BRIDGE_NETFILTER
|
|
if (skb->nf_bridge) {
|
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const struct net_device *physindev;
|
|
const struct net_device *physoutdev;
|
|
|
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physindev = skb->nf_bridge->physindev;
|
|
if (physindev && in != physindev)
|
|
sb_add(m, "PHYSIN=%s ", physindev->name);
|
|
physoutdev = skb->nf_bridge->physoutdev;
|
|
if (physoutdev && out != physoutdev)
|
|
sb_add(m, "PHYSOUT=%s ", physoutdev->name);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
static void
|
|
ipt_log_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 sbuff *m;
|
|
|
|
/* FIXME: Disabled from containers until syslog ns is supported */
|
|
if (!net_eq(net, &init_net))
|
|
return;
|
|
|
|
m = sb_open();
|
|
|
|
if (!loginfo)
|
|
loginfo = &default_loginfo;
|
|
|
|
log_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);
|
|
|
|
sb_close(m);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
|
|
/* One level of recursion won't kill us */
|
|
static void dump_ipv6_packet(struct sbuff *m,
|
|
const struct nf_loginfo *info,
|
|
const struct sk_buff *skb, unsigned int ip6hoff,
|
|
int recurse)
|
|
{
|
|
u_int8_t currenthdr;
|
|
int fragment;
|
|
struct ipv6hdr _ip6h;
|
|
const struct ipv6hdr *ih;
|
|
unsigned int ptr;
|
|
unsigned int hdrlen = 0;
|
|
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, ip6hoff, sizeof(_ip6h), &_ip6h);
|
|
if (ih == NULL) {
|
|
sb_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 " */
|
|
sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
|
|
|
|
/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
|
|
sb_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 && ip6t_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 == NULL) {
|
|
sb_add(m, "TRUNCATED");
|
|
return;
|
|
}
|
|
|
|
/* Max length: 48 "OPT (...) " */
|
|
if (logflags & XT_LOG_IPOPT)
|
|
sb_add(m, "OPT ( ");
|
|
|
|
switch (currenthdr) {
|
|
case IPPROTO_FRAGMENT: {
|
|
struct frag_hdr _fhdr;
|
|
const struct frag_hdr *fh;
|
|
|
|
sb_add(m, "FRAG:");
|
|
fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
|
|
&_fhdr);
|
|
if (fh == NULL) {
|
|
sb_add(m, "TRUNCATED ");
|
|
return;
|
|
}
|
|
|
|
/* Max length: 6 "65535 " */
|
|
sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
|
|
|
|
/* Max length: 11 "INCOMPLETE " */
|
|
if (fh->frag_off & htons(0x0001))
|
|
sb_add(m, "INCOMPLETE ");
|
|
|
|
sb_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 & XT_LOG_IPOPT)
|
|
sb_add(m, ")");
|
|
return;
|
|
}
|
|
hdrlen = ipv6_optlen(hp);
|
|
break;
|
|
/* Max Length */
|
|
case IPPROTO_AH:
|
|
if (logflags & XT_LOG_IPOPT) {
|
|
struct ip_auth_hdr _ahdr;
|
|
const struct ip_auth_hdr *ah;
|
|
|
|
/* Max length: 3 "AH " */
|
|
sb_add(m, "AH ");
|
|
|
|
if (fragment) {
|
|
sb_add(m, ")");
|
|
return;
|
|
}
|
|
|
|
ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
|
|
&_ahdr);
|
|
if (ah == NULL) {
|
|
/*
|
|
* Max length: 26 "INCOMPLETE [65535
|
|
* bytes] )"
|
|
*/
|
|
sb_add(m, "INCOMPLETE [%u bytes] )",
|
|
skb->len - ptr);
|
|
return;
|
|
}
|
|
|
|
/* Length: 15 "SPI=0xF1234567 */
|
|
sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
|
|
|
|
}
|
|
|
|
hdrlen = (hp->hdrlen+2)<<2;
|
|
break;
|
|
case IPPROTO_ESP:
|
|
if (logflags & XT_LOG_IPOPT) {
|
|
struct ip_esp_hdr _esph;
|
|
const struct ip_esp_hdr *eh;
|
|
|
|
/* Max length: 4 "ESP " */
|
|
sb_add(m, "ESP ");
|
|
|
|
if (fragment) {
|
|
sb_add(m, ")");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Max length: 26 "INCOMPLETE [65535 bytes] )"
|
|
*/
|
|
eh = skb_header_pointer(skb, ptr, sizeof(_esph),
|
|
&_esph);
|
|
if (eh == NULL) {
|
|
sb_add(m, "INCOMPLETE [%u bytes] )",
|
|
skb->len - ptr);
|
|
return;
|
|
}
|
|
|
|
/* Length: 16 "SPI=0xF1234567 )" */
|
|
sb_add(m, "SPI=0x%x )", ntohl(eh->spi));
|
|
|
|
}
|
|
return;
|
|
default:
|
|
/* Max length: 20 "Unknown Ext Hdr 255" */
|
|
sb_add(m, "Unknown Ext Hdr %u", currenthdr);
|
|
return;
|
|
}
|
|
if (logflags & XT_LOG_IPOPT)
|
|
sb_add(m, ") ");
|
|
|
|
currenthdr = hp->nexthdr;
|
|
ptr += hdrlen;
|
|
}
|
|
|
|
switch (currenthdr) {
|
|
case IPPROTO_TCP:
|
|
if (dump_tcp_header(m, skb, currenthdr, fragment, ptr,
|
|
logflags))
|
|
return;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
if (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 " */
|
|
sb_add(m, "PROTO=ICMPv6 ");
|
|
|
|
if (fragment)
|
|
break;
|
|
|
|
/* Max length: 25 "INCOMPLETE [65535 bytes] " */
|
|
ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
|
|
if (ic == NULL) {
|
|
sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
|
|
return;
|
|
}
|
|
|
|
/* Max length: 18 "TYPE=255 CODE=255 " */
|
|
sb_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 " */
|
|
sb_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 " */
|
|
sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
|
|
/* Fall through */
|
|
case ICMPV6_DEST_UNREACH:
|
|
case ICMPV6_PKT_TOOBIG:
|
|
case ICMPV6_TIME_EXCEED:
|
|
/* Max length: 3+maxlen */
|
|
if (recurse) {
|
|
sb_add(m, "[");
|
|
dump_ipv6_packet(m, info, skb,
|
|
ptr + sizeof(_icmp6h), 0);
|
|
sb_add(m, "] ");
|
|
}
|
|
|
|
/* Max length: 10 "MTU=65535 " */
|
|
if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
|
|
sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
|
|
}
|
|
break;
|
|
}
|
|
/* Max length: 10 "PROTO=255 " */
|
|
default:
|
|
sb_add(m, "PROTO=%u ", currenthdr);
|
|
}
|
|
|
|
/* Max length: 15 "UID=4294967295 " */
|
|
if ((logflags & XT_LOG_UID) && recurse)
|
|
dump_sk_uid_gid(m, skb->sk);
|
|
|
|
/* Max length: 16 "MARK=0xFFFFFFFF " */
|
|
if (recurse && skb->mark)
|
|
sb_add(m, "MARK=0x%x ", skb->mark);
|
|
}
|
|
|
|
static void dump_ipv6_mac_header(struct sbuff *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:
|
|
sb_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:
|
|
sb_add(m, "MAC=");
|
|
if (dev->hard_header_len &&
|
|
skb->mac_header != skb->network_header) {
|
|
const unsigned char *p = skb_mac_header(skb);
|
|
unsigned int len = dev->hard_header_len;
|
|
unsigned int i;
|
|
|
|
if (dev->type == ARPHRD_SIT) {
|
|
p -= ETH_HLEN;
|
|
|
|
if (p < skb->head)
|
|
p = NULL;
|
|
}
|
|
|
|
if (p != NULL) {
|
|
sb_add(m, "%02x", *p++);
|
|
for (i = 1; i < len; i++)
|
|
sb_add(m, ":%02x", *p++);
|
|
}
|
|
sb_add(m, " ");
|
|
|
|
if (dev->type == ARPHRD_SIT) {
|
|
const struct iphdr *iph =
|
|
(struct iphdr *)skb_mac_header(skb);
|
|
sb_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
|
|
&iph->daddr);
|
|
}
|
|
} else
|
|
sb_add(m, " ");
|
|
}
|
|
|
|
static void
|
|
ip6t_log_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 sbuff *m;
|
|
|
|
/* FIXME: Disabled from containers until syslog ns is supported */
|
|
if (!net_eq(net, &init_net))
|
|
return;
|
|
|
|
m = sb_open();
|
|
|
|
if (!loginfo)
|
|
loginfo = &default_loginfo;
|
|
|
|
log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
|
|
|
|
if (in != NULL)
|
|
dump_ipv6_mac_header(m, loginfo, skb);
|
|
|
|
dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);
|
|
|
|
sb_close(m);
|
|
}
|
|
#endif
|
|
|
|
static unsigned int
|
|
log_tg(struct sk_buff *skb, const struct xt_action_param *par)
|
|
{
|
|
const struct xt_log_info *loginfo = par->targinfo;
|
|
struct nf_loginfo li;
|
|
struct net *net = dev_net(par->in ? par->in : par->out);
|
|
|
|
li.type = NF_LOG_TYPE_LOG;
|
|
li.u.log.level = loginfo->level;
|
|
li.u.log.logflags = loginfo->logflags;
|
|
|
|
if (par->family == NFPROTO_IPV4)
|
|
ipt_log_packet(net, NFPROTO_IPV4, par->hooknum, skb, par->in,
|
|
par->out, &li, loginfo->prefix);
|
|
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
|
|
else if (par->family == NFPROTO_IPV6)
|
|
ip6t_log_packet(net, NFPROTO_IPV6, par->hooknum, skb, par->in,
|
|
par->out, &li, loginfo->prefix);
|
|
#endif
|
|
else
|
|
WARN_ON_ONCE(1);
|
|
|
|
return XT_CONTINUE;
|
|
}
|
|
|
|
static int log_tg_check(const struct xt_tgchk_param *par)
|
|
{
|
|
const struct xt_log_info *loginfo = par->targinfo;
|
|
|
|
if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
|
|
return -EINVAL;
|
|
|
|
if (loginfo->level >= 8) {
|
|
pr_debug("level %u >= 8\n", loginfo->level);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
|
|
pr_debug("prefix is not null-terminated\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct xt_target log_tg_regs[] __read_mostly = {
|
|
{
|
|
.name = "LOG",
|
|
.family = NFPROTO_IPV4,
|
|
.target = log_tg,
|
|
.targetsize = sizeof(struct xt_log_info),
|
|
.checkentry = log_tg_check,
|
|
.me = THIS_MODULE,
|
|
},
|
|
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
|
|
{
|
|
.name = "LOG",
|
|
.family = NFPROTO_IPV6,
|
|
.target = log_tg,
|
|
.targetsize = sizeof(struct xt_log_info),
|
|
.checkentry = log_tg_check,
|
|
.me = THIS_MODULE,
|
|
},
|
|
#endif
|
|
};
|
|
|
|
static struct nf_logger ipt_log_logger __read_mostly = {
|
|
.name = "ipt_LOG",
|
|
.logfn = &ipt_log_packet,
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
|
|
static struct nf_logger ip6t_log_logger __read_mostly = {
|
|
.name = "ip6t_LOG",
|
|
.logfn = &ip6t_log_packet,
|
|
.me = THIS_MODULE,
|
|
};
|
|
#endif
|
|
|
|
static int __net_init log_net_init(struct net *net)
|
|
{
|
|
nf_log_set(net, NFPROTO_IPV4, &ipt_log_logger);
|
|
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
|
|
nf_log_set(net, NFPROTO_IPV6, &ip6t_log_logger);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit log_net_exit(struct net *net)
|
|
{
|
|
nf_log_unset(net, &ipt_log_logger);
|
|
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
|
|
nf_log_unset(net, &ip6t_log_logger);
|
|
#endif
|
|
}
|
|
|
|
static struct pernet_operations log_net_ops = {
|
|
.init = log_net_init,
|
|
.exit = log_net_exit,
|
|
};
|
|
|
|
static int __init log_tg_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_pernet_subsys(&log_net_ops);
|
|
if (ret < 0)
|
|
goto err_pernet;
|
|
|
|
ret = xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
|
|
if (ret < 0)
|
|
goto err_target;
|
|
|
|
nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
|
|
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
|
|
nf_log_register(NFPROTO_IPV6, &ip6t_log_logger);
|
|
#endif
|
|
return 0;
|
|
|
|
err_target:
|
|
unregister_pernet_subsys(&log_net_ops);
|
|
err_pernet:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit log_tg_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&log_net_ops);
|
|
nf_log_unregister(&ipt_log_logger);
|
|
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
|
|
nf_log_unregister(&ip6t_log_logger);
|
|
#endif
|
|
xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
|
|
}
|
|
|
|
module_init(log_tg_init);
|
|
module_exit(log_tg_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
|
|
MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
|
|
MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
|
|
MODULE_ALIAS("ipt_LOG");
|
|
MODULE_ALIAS("ip6t_LOG");
|