| // SPDX-License-Identifier: GPL-2.0-only |
| /* (C) 1999-2001 Paul `Rusty' Russell |
| * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| */ |
| |
| #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_bridge.h> |
| #include <linux/netfilter_ipv6.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, |
| }, |
| }, |
| }; |
| |
| struct arppayload { |
| unsigned char mac_src[ETH_ALEN]; |
| unsigned char ip_src[4]; |
| unsigned char mac_dst[ETH_ALEN]; |
| unsigned char ip_dst[4]; |
| }; |
| |
| /* Guard against containers flooding syslog. */ |
| static bool nf_log_allowed(const struct net *net) |
| { |
| return net_eq(net, &init_net) || sysctl_nf_log_all_netns; |
| } |
| |
| static void nf_log_dump_vlan(struct nf_log_buf *m, const struct sk_buff *skb) |
| { |
| u16 vid; |
| |
| if (!skb_vlan_tag_present(skb)) |
| return; |
| |
| vid = skb_vlan_tag_get(skb); |
| nf_log_buf_add(m, "VPROTO=%04x VID=%u ", ntohs(skb->vlan_proto), vid); |
| } |
| static void noinline_for_stack |
| dump_arp_packet(struct nf_log_buf *m, |
| const struct nf_loginfo *info, |
| const struct sk_buff *skb, unsigned int nhoff) |
| { |
| const struct arppayload *ap; |
| struct arppayload _arpp; |
| const struct arphdr *ah; |
| unsigned int logflags; |
| struct arphdr _arph; |
| |
| ah = skb_header_pointer(skb, nhoff, sizeof(_arph), &_arph); |
| if (!ah) { |
| nf_log_buf_add(m, "TRUNCATED"); |
| return; |
| } |
| |
| if (info->type == NF_LOG_TYPE_LOG) |
| logflags = info->u.log.logflags; |
| else |
| logflags = NF_LOG_DEFAULT_MASK; |
| |
| if (logflags & NF_LOG_MACDECODE) { |
| 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)); |
| } |
| |
| nf_log_buf_add(m, "ARP HTYPE=%d PTYPE=0x%04x OPCODE=%d", |
| ntohs(ah->ar_hrd), ntohs(ah->ar_pro), ntohs(ah->ar_op)); |
| /* If it's for Ethernet and the lengths are OK, then log the ARP |
| * payload. |
| */ |
| if (ah->ar_hrd != htons(ARPHRD_ETHER) || |
| ah->ar_hln != ETH_ALEN || |
| ah->ar_pln != sizeof(__be32)) |
| return; |
| |
| ap = skb_header_pointer(skb, nhoff + sizeof(_arph), sizeof(_arpp), &_arpp); |
| if (!ap) { |
| nf_log_buf_add(m, " INCOMPLETE [%zu bytes]", |
| skb->len - sizeof(_arph)); |
| return; |
| } |
| nf_log_buf_add(m, " MACSRC=%pM IPSRC=%pI4 MACDST=%pM IPDST=%pI4", |
| ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst); |
| } |
| |
| static void |
| nf_log_dump_packet_common(struct nf_log_buf *m, u8 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 net *net) |
| { |
| const struct net_device *physoutdev __maybe_unused; |
| const struct net_device *physindev __maybe_unused; |
| |
| nf_log_buf_add(m, KERN_SOH "%c%sIN=%s OUT=%s ", |
| '0' + loginfo->u.log.level, prefix, |
| in ? in->name : "", |
| out ? out->name : ""); |
| #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
| physindev = nf_bridge_get_physindev(skb, net); |
| if (physindev && in != physindev) |
| nf_log_buf_add(m, "PHYSIN=%s ", physindev->name); |
| physoutdev = nf_bridge_get_physoutdev(skb); |
| if (physoutdev && out != physoutdev) |
| nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name); |
| #endif |
| } |
| |
| static void nf_log_arp_packet(struct net *net, u_int8_t pf, |
| unsigned int hooknum, const struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| const struct nf_loginfo *loginfo, |
| const char *prefix) |
| { |
| struct nf_log_buf *m; |
| |
| 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_arp_packet(m, loginfo, skb, skb_network_offset(skb)); |
| |
| nf_log_buf_close(m); |
| } |
| |
| static struct nf_logger nf_arp_logger __read_mostly = { |
| .name = "nf_log_arp", |
| .type = NF_LOG_TYPE_LOG, |
| .logfn = nf_log_arp_packet, |
| .me = THIS_MODULE, |
| }; |
| |
| static void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m, |
| struct sock *sk) |
| { |
| if (!sk || !sk_fullsock(sk) || !net_eq(net, sock_net(sk))) |
| return; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| if (sk->sk_socket && sk->sk_socket->file) { |
| const struct cred *cred = sk->sk_socket->file->f_cred; |
| |
| nf_log_buf_add(m, "UID=%u GID=%u ", |
| from_kuid_munged(&init_user_ns, cred->fsuid), |
| from_kgid_munged(&init_user_ns, cred->fsgid)); |
| } |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static noinline_for_stack int |
| nf_log_dump_tcp_header(struct nf_log_buf *m, |
| const struct sk_buff *skb, |
| u8 proto, int fragment, |
| unsigned int offset, |
| unsigned int logflags) |
| { |
| struct tcphdr _tcph; |
| const struct tcphdr *th; |
| |
| /* Max length: 10 "PROTO=TCP " */ |
| nf_log_buf_add(m, "PROTO=TCP "); |
| |
| if (fragment) |
| return 0; |
| |
| /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| if (!th) { |
| nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset); |
| return 1; |
| } |
| |
| /* Max length: 20 "SPT=65535 DPT=65535 " */ |
| nf_log_buf_add(m, "SPT=%u DPT=%u ", |
| ntohs(th->source), ntohs(th->dest)); |
| /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */ |
| if (logflags & NF_LOG_TCPSEQ) { |
| nf_log_buf_add(m, "SEQ=%u ACK=%u ", |
| ntohl(th->seq), ntohl(th->ack_seq)); |
| } |
| |
| /* Max length: 13 "WINDOW=65535 " */ |
| nf_log_buf_add(m, "WINDOW=%u ", ntohs(th->window)); |
| /* Max length: 9 "RES=0x3C " */ |
| nf_log_buf_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & |
| TCP_RESERVED_BITS) >> 22)); |
| /* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */ |
| if (th->cwr) |
| nf_log_buf_add(m, "CWR "); |
| if (th->ece) |
| nf_log_buf_add(m, "ECE "); |
| if (th->urg) |
| nf_log_buf_add(m, "URG "); |
| if (th->ack) |
| nf_log_buf_add(m, "ACK "); |
| if (th->psh) |
| nf_log_buf_add(m, "PSH "); |
| if (th->rst) |
| nf_log_buf_add(m, "RST "); |
| if (th->syn) |
| nf_log_buf_add(m, "SYN "); |
| if (th->fin) |
| nf_log_buf_add(m, "FIN "); |
| /* Max length: 11 "URGP=65535 " */ |
| nf_log_buf_add(m, "URGP=%u ", ntohs(th->urg_ptr)); |
| |
| if ((logflags & NF_LOG_TCPOPT) && th->doff * 4 > sizeof(struct tcphdr)) { |
| unsigned int optsize = th->doff * 4 - sizeof(struct tcphdr); |
| u8 _opt[60 - sizeof(struct tcphdr)]; |
| unsigned int i; |
| const u8 *op; |
| |
| op = skb_header_pointer(skb, offset + sizeof(struct tcphdr), |
| optsize, _opt); |
| if (!op) { |
| nf_log_buf_add(m, "OPT (TRUNCATED)"); |
| return 1; |
| } |
| |
| /* Max length: 127 "OPT (" 15*4*2chars ") " */ |
| nf_log_buf_add(m, "OPT ("); |
| for (i = 0; i < optsize; i++) |
| nf_log_buf_add(m, "%02X", op[i]); |
| |
| nf_log_buf_add(m, ") "); |
| } |
| |
| return 0; |
| } |
| |
| static noinline_for_stack int |
| nf_log_dump_udp_header(struct nf_log_buf *m, |
| const struct sk_buff *skb, |
| u8 proto, int fragment, |
| unsigned int offset) |
| { |
| struct udphdr _udph; |
| const struct udphdr *uh; |
| |
| if (proto == IPPROTO_UDP) |
| /* Max length: 10 "PROTO=UDP " */ |
| nf_log_buf_add(m, "PROTO=UDP "); |
| else /* Max length: 14 "PROTO=UDPLITE " */ |
| nf_log_buf_add(m, "PROTO=UDPLITE "); |
| |
| if (fragment) |
| goto out; |
| |
| /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| if (!uh) { |
| nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset); |
| |
| return 1; |
| } |
| |
| /* Max length: 20 "SPT=65535 DPT=65535 " */ |
| nf_log_buf_add(m, "SPT=%u DPT=%u LEN=%u ", |
| ntohs(uh->source), ntohs(uh->dest), ntohs(uh->len)); |
| |
| out: |
| return 0; |
| } |
| |
| /* One level of recursion won't kill us */ |
| static noinline_for_stack void |
| dump_ipv4_packet(struct net *net, struct nf_log_buf *m, |
| const struct nf_loginfo *info, |
| const struct sk_buff *skb, unsigned int iphoff) |
| { |
| const struct iphdr *ih; |
| unsigned int logflags; |
| struct iphdr _iph; |
| |
| if (info->type == NF_LOG_TYPE_LOG) |
| logflags = info->u.log.logflags; |
| else |
| logflags = NF_LOG_DEFAULT_MASK; |
| |
| ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph); |
| if (!ih) { |
| nf_log_buf_add(m, "TRUNCATED"); |
| return; |
| } |
| |
| /* Important fields: |
| * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. |
| * Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " |
| */ |
| nf_log_buf_add(m, "SRC=%pI4 DST=%pI4 ", &ih->saddr, &ih->daddr); |
| |
| /* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */ |
| nf_log_buf_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ", |
| iph_totlen(skb, ih), ih->tos & IPTOS_TOS_MASK, |
| ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id)); |
| |
| /* Max length: 6 "CE DF MF " */ |
| if (ntohs(ih->frag_off) & IP_CE) |
| nf_log_buf_add(m, "CE "); |
| if (ntohs(ih->frag_off) & IP_DF) |
| nf_log_buf_add(m, "DF "); |
| if (ntohs(ih->frag_off) & IP_MF) |
| nf_log_buf_add(m, "MF "); |
| |
| /* Max length: 11 "FRAG:65535 " */ |
| if (ntohs(ih->frag_off) & IP_OFFSET) |
| nf_log_buf_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET); |
| |
| if ((logflags & NF_LOG_IPOPT) && |
| ih->ihl * 4 > sizeof(struct iphdr)) { |
| unsigned char _opt[4 * 15 - sizeof(struct iphdr)]; |
| const unsigned char *op; |
| unsigned int i, optsize; |
| |
| optsize = ih->ihl * 4 - sizeof(struct iphdr); |
| op = skb_header_pointer(skb, iphoff + sizeof(_iph), |
| optsize, _opt); |
| if (!op) { |
| nf_log_buf_add(m, "TRUNCATED"); |
| return; |
| } |
| |
| /* Max length: 127 "OPT (" 15*4*2chars ") " */ |
| nf_log_buf_add(m, "OPT ("); |
| for (i = 0; i < optsize; i++) |
| nf_log_buf_add(m, "%02X", op[i]); |
| nf_log_buf_add(m, ") "); |
| } |
| |
| switch (ih->protocol) { |
| case IPPROTO_TCP: |
| if (nf_log_dump_tcp_header(m, skb, ih->protocol, |
| ntohs(ih->frag_off) & IP_OFFSET, |
| iphoff + ih->ihl * 4, logflags)) |
| return; |
| break; |
| case IPPROTO_UDP: |
| case IPPROTO_UDPLITE: |
| if (nf_log_dump_udp_header(m, skb, ih->protocol, |
| ntohs(ih->frag_off) & IP_OFFSET, |
| iphoff + ih->ihl * 4)) |
| return; |
| break; |
| case IPPROTO_ICMP: { |
| static const size_t required_len[NR_ICMP_TYPES + 1] = { |
| [ICMP_ECHOREPLY] = 4, |
| [ICMP_DEST_UNREACH] = 8 + sizeof(struct iphdr), |
| [ICMP_SOURCE_QUENCH] = 8 + sizeof(struct iphdr), |
| [ICMP_REDIRECT] = 8 + sizeof(struct iphdr), |
| [ICMP_ECHO] = 4, |
| [ICMP_TIME_EXCEEDED] = 8 + sizeof(struct iphdr), |
| [ICMP_PARAMETERPROB] = 8 + sizeof(struct iphdr), |
| [ICMP_TIMESTAMP] = 20, |
| [ICMP_TIMESTAMPREPLY] = 20, |
| [ICMP_ADDRESS] = 12, |
| [ICMP_ADDRESSREPLY] = 12 }; |
| const struct icmphdr *ich; |
| struct icmphdr _icmph; |
| |
| /* Max length: 11 "PROTO=ICMP " */ |
| nf_log_buf_add(m, "PROTO=ICMP "); |
| |
| if (ntohs(ih->frag_off) & IP_OFFSET) |
| break; |
| |
| /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| ich = skb_header_pointer(skb, iphoff + ih->ihl * 4, |
| sizeof(_icmph), &_icmph); |
| if (!ich) { |
| nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", |
| skb->len - iphoff - ih->ihl * 4); |
| break; |
| } |
| |
| /* Max length: 18 "TYPE=255 CODE=255 " */ |
| nf_log_buf_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code); |
| |
| /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| if (ich->type <= NR_ICMP_TYPES && |
| required_len[ich->type] && |
| skb->len - iphoff - ih->ihl * 4 < required_len[ich->type]) { |
| nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", |
| skb->len - iphoff - ih->ihl * 4); |
| break; |
| } |
| |
| switch (ich->type) { |
| case ICMP_ECHOREPLY: |
| case ICMP_ECHO: |
| /* Max length: 19 "ID=65535 SEQ=65535 " */ |
| nf_log_buf_add(m, "ID=%u SEQ=%u ", |
| ntohs(ich->un.echo.id), |
| ntohs(ich->un.echo.sequence)); |
| break; |
| |
| case ICMP_PARAMETERPROB: |
| /* Max length: 14 "PARAMETER=255 " */ |
| nf_log_buf_add(m, "PARAMETER=%u ", |
| ntohl(ich->un.gateway) >> 24); |
| break; |
| case ICMP_REDIRECT: |
| /* Max length: 24 "GATEWAY=255.255.255.255 " */ |
| nf_log_buf_add(m, "GATEWAY=%pI4 ", &ich->un.gateway); |
| fallthrough; |
| case ICMP_DEST_UNREACH: |
| case ICMP_SOURCE_QUENCH: |
| case ICMP_TIME_EXCEEDED: |
| /* Max length: 3+maxlen */ |
| if (!iphoff) { /* Only recurse once. */ |
| nf_log_buf_add(m, "["); |
| dump_ipv4_packet(net, m, info, skb, |
| iphoff + ih->ihl * 4 + sizeof(_icmph)); |
| nf_log_buf_add(m, "] "); |
| } |
| |
| /* Max length: 10 "MTU=65535 " */ |
| if (ich->type == ICMP_DEST_UNREACH && |
| ich->code == ICMP_FRAG_NEEDED) { |
| nf_log_buf_add(m, "MTU=%u ", |
| ntohs(ich->un.frag.mtu)); |
| } |
| } |
| break; |
| } |
| /* Max Length */ |
| case IPPROTO_AH: { |
| 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); |
