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- /* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/spinlock.h>
- #include <linux/skbuff.h>
- #include <linux/if_arp.h>
- #include <linux/ip.h>
- #include <net/ipv6.h>
- #include <net/icmp.h>
- #include <net/udp.h>
- #include <net/tcp.h>
- #include <net/route.h>
- #include <linux/netfilter.h>
- #include <linux/netfilter_ipv6/ip6_tables.h>
- #include <linux/netfilter/xt_LOG.h>
- #include <net/netfilter/nf_log.h>
- static struct nf_loginfo default_loginfo = {
- .type = NF_LOG_TYPE_LOG,
- .u = {
- .log = {
- .level = LOGLEVEL_NOTICE,
- .logflags = NF_LOG_MASK,
- },
- },
- };
- /* One level of recursion won't kill us */
- static void dump_ipv6_packet(struct nf_log_buf *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) {
- 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 && 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) {
- nf_log_buf_add(m, "TRUNCATED");
- return;
- }
- /* Max length: 48 "OPT (...) " */
- if (logflags & XT_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 == NULL) {
- 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 & XT_LOG_IPOPT)
- nf_log_buf_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 " */
- 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 == NULL) {
- /*
- * 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 = (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 " */
- 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 == NULL) {
- 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 & XT_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 == NULL) {
- 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));
- /* Fall through */
- 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(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 & XT_LOG_UID) && recurse)
- nf_log_dump_sk_uid_gid(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_ipv6_mac_header(struct nf_log_buf *m,
- const struct nf_loginfo *info,
- const struct sk_buff *skb)
- {
- struct net_device *dev = skb->dev;
- unsigned int logflags = 0;
- if (info->type == NF_LOG_TYPE_LOG)
- logflags = info->u.log.logflags;
- if (!(logflags & XT_LOG_MACDECODE))
- goto fallback;
- switch (dev->type) {
- case ARPHRD_ETHER:
- nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
- eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
- ntohs(eth_hdr(skb)->h_proto));
- return;
- default:
- break;
- }
- fallback:
- nf_log_buf_add(m, "MAC=");
- if (dev->hard_header_len &&
- skb->mac_header != skb->network_header) {
- const unsigned char *p = skb_mac_header(skb);
- unsigned int 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) {
- nf_log_buf_add(m, "%02x", *p++);
- for (i = 1; i < len; i++)
- nf_log_buf_add(m, ":%02x", *p++);
- }
- nf_log_buf_add(m, " ");
- 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);
- }
- } else {
- nf_log_buf_add(m, " ");
- }
- }
- 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;
- /* FIXME: Disabled from containers until syslog ns is supported */
- if (!net_eq(net, &init_net))
- return;
- m = nf_log_buf_open();
- if (!loginfo)
- loginfo = &default_loginfo;
- nf_log_dump_packet_common(m, pf, hooknum, skb, in, out,
- loginfo, prefix);
- if (in != NULL)
- dump_ipv6_mac_header(m, loginfo, skb);
- dump_ipv6_packet(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 int __net_init nf_log_ipv6_net_init(struct net *net)
- {
- nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger);
- return 0;
- }
- static void __net_exit nf_log_ipv6_net_exit(struct net *net)
- {
- nf_log_unset(net, &nf_ip6_logger);
- }
- static struct pernet_operations nf_log_ipv6_net_ops = {
- .init = nf_log_ipv6_net_init,
- .exit = nf_log_ipv6_net_exit,
- };
- static int __init nf_log_ipv6_init(void)
- {
- int ret;
- ret = register_pernet_subsys(&nf_log_ipv6_net_ops);
- if (ret < 0)
- return ret;
- ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger);
- if (ret < 0) {
- pr_err("failed to register logger\n");
- goto err1;
- }
- return 0;
- err1:
- unregister_pernet_subsys(&nf_log_ipv6_net_ops);
- return ret;
- }
- static void __exit nf_log_ipv6_exit(void)
- {
- unregister_pernet_subsys(&nf_log_ipv6_net_ops);
- nf_log_unregister(&nf_ip6_logger);
- }
- module_init(nf_log_ipv6_init);
- module_exit(nf_log_ipv6_exit);
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
- MODULE_DESCRIPTION("Netfilter IPv6 packet logging");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS_NF_LOGGER(AF_INET6, 0);
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