| /* (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 const struct nf_loginfo default_loginfo = { |
| .type = NF_LOG_TYPE_LOG, |
| .u = { |
| .log = { |
| .level = LOGLEVEL_NOTICE, |
| .logflags = NF_LOG_DEFAULT_MASK, |
| }, |
| }, |
| }; |
| |
| /* One level of recursion won't kill us */ |
| static 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) |
| { |
| 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_DEFAULT_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 & 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 == 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 & 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 == 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 & 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 == 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 & 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 == 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(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_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 & NF_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) && !sysctl_nf_log_all_netns) |
| 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(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 int __net_init nf_log_ipv6_net_init(struct net *net) |
| { |
| return nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger); |
| } |
| |
| 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); |