Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This is a module which is used for logging packets. |
| 3 | */ |
| 4 | |
| 5 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 6 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/spinlock.h> |
| 15 | #include <linux/skbuff.h> |
| 16 | #include <linux/ip.h> |
| 17 | #include <net/icmp.h> |
| 18 | #include <net/udp.h> |
| 19 | #include <net/tcp.h> |
| 20 | #include <net/route.h> |
| 21 | |
| 22 | #include <linux/netfilter.h> |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 23 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/netfilter_ipv4/ipt_LOG.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 25 | #include <net/netfilter/nf_log.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | MODULE_LICENSE("GPL"); |
| 28 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 29 | MODULE_DESCRIPTION("Xtables: IPv4 packet logging to syslog"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | /* Use lock to serialize, so printks don't overlap */ |
| 32 | static DEFINE_SPINLOCK(log_lock); |
| 33 | |
| 34 | /* One level of recursion won't kill us */ |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 35 | static void dump_packet(const struct nf_loginfo *info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | const struct sk_buff *skb, |
| 37 | unsigned int iphoff) |
| 38 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 39 | struct iphdr _iph; |
| 40 | const struct iphdr *ih; |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 41 | unsigned int logflags; |
| 42 | |
| 43 | if (info->type == NF_LOG_TYPE_LOG) |
| 44 | logflags = info->u.log.logflags; |
| 45 | else |
| 46 | logflags = NF_LOG_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph); |
| 49 | if (ih == NULL) { |
| 50 | printk("TRUNCATED"); |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | /* Important fields: |
| 55 | * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */ |
| 56 | /* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */ |
| 57 | printk("SRC=%u.%u.%u.%u DST=%u.%u.%u.%u ", |
| 58 | NIPQUAD(ih->saddr), NIPQUAD(ih->daddr)); |
| 59 | |
| 60 | /* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */ |
| 61 | printk("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ", |
| 62 | ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK, |
| 63 | ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id)); |
| 64 | |
| 65 | /* Max length: 6 "CE DF MF " */ |
| 66 | if (ntohs(ih->frag_off) & IP_CE) |
| 67 | printk("CE "); |
| 68 | if (ntohs(ih->frag_off) & IP_DF) |
| 69 | printk("DF "); |
| 70 | if (ntohs(ih->frag_off) & IP_MF) |
| 71 | printk("MF "); |
| 72 | |
| 73 | /* Max length: 11 "FRAG:65535 " */ |
| 74 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 75 | printk("FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET); |
| 76 | |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 77 | if ((logflags & IPT_LOG_IPOPT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | && ih->ihl * 4 > sizeof(struct iphdr)) { |
Jan Engelhardt | 3cf93c9 | 2008-04-14 09:56:05 +0200 | [diff] [blame] | 79 | const unsigned char *op; |
| 80 | unsigned char _opt[4 * 15 - sizeof(struct iphdr)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | unsigned int i, optsize; |
| 82 | |
| 83 | optsize = ih->ihl * 4 - sizeof(struct iphdr); |
| 84 | op = skb_header_pointer(skb, iphoff+sizeof(_iph), |
| 85 | optsize, _opt); |
| 86 | if (op == NULL) { |
| 87 | printk("TRUNCATED"); |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | /* Max length: 127 "OPT (" 15*4*2chars ") " */ |
| 92 | printk("OPT ("); |
| 93 | for (i = 0; i < optsize; i++) |
| 94 | printk("%02X", op[i]); |
| 95 | printk(") "); |
| 96 | } |
| 97 | |
| 98 | switch (ih->protocol) { |
| 99 | case IPPROTO_TCP: { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 100 | struct tcphdr _tcph; |
| 101 | const struct tcphdr *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | /* Max length: 10 "PROTO=TCP " */ |
| 104 | printk("PROTO=TCP "); |
| 105 | |
| 106 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 107 | break; |
| 108 | |
| 109 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| 110 | th = skb_header_pointer(skb, iphoff + ih->ihl * 4, |
| 111 | sizeof(_tcph), &_tcph); |
| 112 | if (th == NULL) { |
| 113 | printk("INCOMPLETE [%u bytes] ", |
| 114 | skb->len - iphoff - ih->ihl*4); |
| 115 | break; |
| 116 | } |
| 117 | |
| 118 | /* Max length: 20 "SPT=65535 DPT=65535 " */ |
| 119 | printk("SPT=%u DPT=%u ", |
| 120 | ntohs(th->source), ntohs(th->dest)); |
| 121 | /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */ |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 122 | if (logflags & IPT_LOG_TCPSEQ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | printk("SEQ=%u ACK=%u ", |
| 124 | ntohl(th->seq), ntohl(th->ack_seq)); |
| 125 | /* Max length: 13 "WINDOW=65535 " */ |
| 126 | printk("WINDOW=%u ", ntohs(th->window)); |
| 127 | /* Max length: 9 "RES=0x3F " */ |
| 128 | printk("RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22)); |
| 129 | /* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */ |
| 130 | if (th->cwr) |
| 131 | printk("CWR "); |
| 132 | if (th->ece) |
| 133 | printk("ECE "); |
| 134 | if (th->urg) |
| 135 | printk("URG "); |
| 136 | if (th->ack) |
| 137 | printk("ACK "); |
| 138 | if (th->psh) |
| 139 | printk("PSH "); |
| 140 | if (th->rst) |
| 141 | printk("RST "); |
| 142 | if (th->syn) |
| 143 | printk("SYN "); |
| 144 | if (th->fin) |
| 145 | printk("FIN "); |
| 146 | /* Max length: 11 "URGP=65535 " */ |
| 147 | printk("URGP=%u ", ntohs(th->urg_ptr)); |
| 148 | |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 149 | if ((logflags & IPT_LOG_TCPOPT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | && th->doff * 4 > sizeof(struct tcphdr)) { |
| 151 | unsigned char _opt[4 * 15 - sizeof(struct tcphdr)]; |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 152 | const unsigned char *op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | unsigned int i, optsize; |
| 154 | |
| 155 | optsize = th->doff * 4 - sizeof(struct tcphdr); |
| 156 | op = skb_header_pointer(skb, |
| 157 | iphoff+ih->ihl*4+sizeof(_tcph), |
| 158 | optsize, _opt); |
| 159 | if (op == NULL) { |
| 160 | printk("TRUNCATED"); |
| 161 | return; |
| 162 | } |
| 163 | |
| 164 | /* Max length: 127 "OPT (" 15*4*2chars ") " */ |
| 165 | printk("OPT ("); |
| 166 | for (i = 0; i < optsize; i++) |
| 167 | printk("%02X", op[i]); |
| 168 | printk(") "); |
| 169 | } |
| 170 | break; |
| 171 | } |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 172 | case IPPROTO_UDP: |
| 173 | case IPPROTO_UDPLITE: { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 174 | struct udphdr _udph; |
| 175 | const struct udphdr *uh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 177 | if (ih->protocol == IPPROTO_UDP) |
| 178 | /* Max length: 10 "PROTO=UDP " */ |
| 179 | printk("PROTO=UDP " ); |
| 180 | else /* Max length: 14 "PROTO=UDPLITE " */ |
| 181 | printk("PROTO=UDPLITE "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 184 | break; |
| 185 | |
| 186 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| 187 | uh = skb_header_pointer(skb, iphoff+ih->ihl*4, |
| 188 | sizeof(_udph), &_udph); |
| 189 | if (uh == NULL) { |
| 190 | printk("INCOMPLETE [%u bytes] ", |
| 191 | skb->len - iphoff - ih->ihl*4); |
| 192 | break; |
| 193 | } |
| 194 | |
| 195 | /* Max length: 20 "SPT=65535 DPT=65535 " */ |
| 196 | printk("SPT=%u DPT=%u LEN=%u ", |
| 197 | ntohs(uh->source), ntohs(uh->dest), |
| 198 | ntohs(uh->len)); |
| 199 | break; |
| 200 | } |
| 201 | case IPPROTO_ICMP: { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 202 | struct icmphdr _icmph; |
| 203 | const struct icmphdr *ich; |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 204 | static const size_t required_len[NR_ICMP_TYPES+1] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | = { [ICMP_ECHOREPLY] = 4, |
| 206 | [ICMP_DEST_UNREACH] |
| 207 | = 8 + sizeof(struct iphdr), |
| 208 | [ICMP_SOURCE_QUENCH] |
| 209 | = 8 + sizeof(struct iphdr), |
| 210 | [ICMP_REDIRECT] |
| 211 | = 8 + sizeof(struct iphdr), |
| 212 | [ICMP_ECHO] = 4, |
| 213 | [ICMP_TIME_EXCEEDED] |
| 214 | = 8 + sizeof(struct iphdr), |
| 215 | [ICMP_PARAMETERPROB] |
| 216 | = 8 + sizeof(struct iphdr), |
| 217 | [ICMP_TIMESTAMP] = 20, |
| 218 | [ICMP_TIMESTAMPREPLY] = 20, |
| 219 | [ICMP_ADDRESS] = 12, |
| 220 | [ICMP_ADDRESSREPLY] = 12 }; |
| 221 | |
| 222 | /* Max length: 11 "PROTO=ICMP " */ |
| 223 | printk("PROTO=ICMP "); |
| 224 | |
| 225 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 226 | break; |
| 227 | |
| 228 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| 229 | ich = skb_header_pointer(skb, iphoff + ih->ihl * 4, |
| 230 | sizeof(_icmph), &_icmph); |
| 231 | if (ich == NULL) { |
| 232 | printk("INCOMPLETE [%u bytes] ", |
| 233 | skb->len - iphoff - ih->ihl*4); |
| 234 | break; |
| 235 | } |
| 236 | |
| 237 | /* Max length: 18 "TYPE=255 CODE=255 " */ |
| 238 | printk("TYPE=%u CODE=%u ", ich->type, ich->code); |
| 239 | |
| 240 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| 241 | if (ich->type <= NR_ICMP_TYPES |
| 242 | && required_len[ich->type] |
| 243 | && skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) { |
| 244 | printk("INCOMPLETE [%u bytes] ", |
| 245 | skb->len - iphoff - ih->ihl*4); |
| 246 | break; |
| 247 | } |
| 248 | |
| 249 | switch (ich->type) { |
| 250 | case ICMP_ECHOREPLY: |
| 251 | case ICMP_ECHO: |
| 252 | /* Max length: 19 "ID=65535 SEQ=65535 " */ |
| 253 | printk("ID=%u SEQ=%u ", |
| 254 | ntohs(ich->un.echo.id), |
| 255 | ntohs(ich->un.echo.sequence)); |
| 256 | break; |
| 257 | |
| 258 | case ICMP_PARAMETERPROB: |
| 259 | /* Max length: 14 "PARAMETER=255 " */ |
| 260 | printk("PARAMETER=%u ", |
| 261 | ntohl(ich->un.gateway) >> 24); |
| 262 | break; |
| 263 | case ICMP_REDIRECT: |
| 264 | /* Max length: 24 "GATEWAY=255.255.255.255 " */ |
| 265 | printk("GATEWAY=%u.%u.%u.%u ", |
| 266 | NIPQUAD(ich->un.gateway)); |
| 267 | /* Fall through */ |
| 268 | case ICMP_DEST_UNREACH: |
| 269 | case ICMP_SOURCE_QUENCH: |
| 270 | case ICMP_TIME_EXCEEDED: |
| 271 | /* Max length: 3+maxlen */ |
| 272 | if (!iphoff) { /* Only recurse once. */ |
| 273 | printk("["); |
| 274 | dump_packet(info, skb, |
| 275 | iphoff + ih->ihl*4+sizeof(_icmph)); |
| 276 | printk("] "); |
| 277 | } |
| 278 | |
| 279 | /* Max length: 10 "MTU=65535 " */ |
| 280 | if (ich->type == ICMP_DEST_UNREACH |
| 281 | && ich->code == ICMP_FRAG_NEEDED) |
| 282 | printk("MTU=%u ", ntohs(ich->un.frag.mtu)); |
| 283 | } |
| 284 | break; |
| 285 | } |
| 286 | /* Max Length */ |
| 287 | case IPPROTO_AH: { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 288 | struct ip_auth_hdr _ahdr; |
| 289 | const struct ip_auth_hdr *ah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 292 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | /* Max length: 9 "PROTO=AH " */ |
| 295 | printk("PROTO=AH "); |
| 296 | |
| 297 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| 298 | ah = skb_header_pointer(skb, iphoff+ih->ihl*4, |
| 299 | sizeof(_ahdr), &_ahdr); |
| 300 | if (ah == NULL) { |
| 301 | printk("INCOMPLETE [%u bytes] ", |
| 302 | skb->len - iphoff - ih->ihl*4); |
| 303 | break; |
| 304 | } |
| 305 | |
| 306 | /* Length: 15 "SPI=0xF1234567 " */ |
| 307 | printk("SPI=0x%x ", ntohl(ah->spi)); |
| 308 | break; |
| 309 | } |
| 310 | case IPPROTO_ESP: { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 311 | struct ip_esp_hdr _esph; |
| 312 | const struct ip_esp_hdr *eh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | /* Max length: 10 "PROTO=ESP " */ |
| 315 | printk("PROTO=ESP "); |
| 316 | |
| 317 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 318 | break; |
| 319 | |
| 320 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ |
| 321 | eh = skb_header_pointer(skb, iphoff+ih->ihl*4, |
| 322 | sizeof(_esph), &_esph); |
| 323 | if (eh == NULL) { |
| 324 | printk("INCOMPLETE [%u bytes] ", |
| 325 | skb->len - iphoff - ih->ihl*4); |
| 326 | break; |
| 327 | } |
| 328 | |
| 329 | /* Length: 15 "SPI=0xF1234567 " */ |
| 330 | printk("SPI=0x%x ", ntohl(eh->spi)); |
| 331 | break; |
| 332 | } |
| 333 | /* Max length: 10 "PROTO 255 " */ |
| 334 | default: |
| 335 | printk("PROTO=%u ", ih->protocol); |
| 336 | } |
| 337 | |
| 338 | /* Max length: 15 "UID=4294967295 " */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 339 | if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | read_lock_bh(&skb->sk->sk_callback_lock); |
| 341 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) |
Patrick McHardy | 36e2a1b | 2008-03-20 15:15:45 +0100 | [diff] [blame] | 342 | printk("UID=%u GID=%u ", |
Maciej Soltysiak | 17dfc93 | 2007-12-04 23:50:38 -0800 | [diff] [blame] | 343 | skb->sk->sk_socket->file->f_uid, |
| 344 | skb->sk->sk_socket->file->f_gid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 346 | } |
| 347 | |
Patrick McHardy | 36e2a1b | 2008-03-20 15:15:45 +0100 | [diff] [blame] | 348 | /* Max length: 16 "MARK=0xFFFFFFFF " */ |
| 349 | if (!iphoff && skb->mark) |
| 350 | printk("MARK=0x%x ", skb->mark); |
| 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | /* Proto Max log string length */ |
| 353 | /* IP: 40+46+6+11+127 = 230 */ |
| 354 | /* TCP: 10+max(25,20+30+13+9+32+11+127) = 252 */ |
| 355 | /* UDP: 10+max(25,20) = 35 */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 356 | /* UDPLITE: 14+max(25,20) = 39 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | /* ICMP: 11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */ |
| 358 | /* ESP: 10+max(25)+15 = 50 */ |
| 359 | /* AH: 9+max(25)+15 = 49 */ |
| 360 | /* unknown: 10 */ |
| 361 | |
| 362 | /* (ICMP allows recursion one level deep) */ |
| 363 | /* maxlen = IP + ICMP + IP + max(TCP,UDP,ICMP,unknown) */ |
| 364 | /* maxlen = 230+ 91 + 230 + 252 = 803 */ |
| 365 | } |
| 366 | |
Adrian Bunk | d127e94 | 2005-11-29 16:28:18 -0800 | [diff] [blame] | 367 | static struct nf_loginfo default_loginfo = { |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 368 | .type = NF_LOG_TYPE_LOG, |
| 369 | .u = { |
| 370 | .log = { |
| 371 | .level = 0, |
| 372 | .logflags = NF_LOG_MASK, |
| 373 | }, |
| 374 | }, |
| 375 | }; |
| 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | static void |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 378 | ipt_log_packet(unsigned int pf, |
| 379 | unsigned int hooknum, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | const struct sk_buff *skb, |
| 381 | const struct net_device *in, |
| 382 | const struct net_device *out, |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 383 | const struct nf_loginfo *loginfo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | const char *prefix) |
| 385 | { |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 386 | if (!loginfo) |
| 387 | loginfo = &default_loginfo; |
| 388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | spin_lock_bh(&log_lock); |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 390 | printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level, |
| 391 | prefix, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | in ? in->name : "", |
| 393 | out ? out->name : ""); |
| 394 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 395 | if (skb->nf_bridge) { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 396 | const struct net_device *physindev; |
| 397 | const struct net_device *physoutdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 399 | physindev = skb->nf_bridge->physindev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | if (physindev && in != physindev) |
| 401 | printk("PHYSIN=%s ", physindev->name); |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 402 | physoutdev = skb->nf_bridge->physoutdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | if (physoutdev && out != physoutdev) |
| 404 | printk("PHYSOUT=%s ", physoutdev->name); |
| 405 | } |
| 406 | #endif |
| 407 | |
| 408 | if (in && !out) { |
| 409 | /* MAC logging for input chain only. */ |
| 410 | printk("MAC="); |
| 411 | if (skb->dev && skb->dev->hard_header_len |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 412 | && skb->mac_header != skb->network_header) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | int i; |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 414 | const unsigned char *p = skb_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | for (i = 0; i < skb->dev->hard_header_len; i++,p++) |
| 416 | printk("%02x%c", *p, |
| 417 | i==skb->dev->hard_header_len - 1 |
| 418 | ? ' ':':'); |
| 419 | } else |
| 420 | printk(" "); |
| 421 | } |
| 422 | |
| 423 | dump_packet(loginfo, skb, 0); |
| 424 | printk("\n"); |
| 425 | spin_unlock_bh(&log_lock); |
| 426 | } |
| 427 | |
| 428 | static unsigned int |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 429 | log_tg(struct sk_buff *skb, const struct net_device *in, |
| 430 | const struct net_device *out, unsigned int hooknum, |
| 431 | const struct xt_target *target, const void *targinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | { |
| 433 | const struct ipt_log_info *loginfo = targinfo; |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 434 | struct nf_loginfo li; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 436 | li.type = NF_LOG_TYPE_LOG; |
| 437 | li.u.log.level = loginfo->level; |
| 438 | li.u.log.logflags = loginfo->logflags; |
| 439 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 440 | ipt_log_packet(PF_INET, hooknum, skb, in, out, &li, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 441 | loginfo->prefix); |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 442 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 445 | static bool |
| 446 | log_tg_check(const char *tablename, const void *e, |
| 447 | const struct xt_target *target, void *targinfo, |
| 448 | unsigned int hook_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | { |
| 450 | const struct ipt_log_info *loginfo = targinfo; |
| 451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | if (loginfo->level >= 8) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 453 | pr_debug("LOG: level %u >= 8\n", loginfo->level); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 454 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 457 | pr_debug("LOG: prefix term %i\n", |
| 458 | loginfo->prefix[sizeof(loginfo->prefix)-1]); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 459 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 461 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
| 463 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 464 | static struct xt_target log_tg_reg __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | .name = "LOG", |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 466 | .family = AF_INET, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 467 | .target = log_tg, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 468 | .targetsize = sizeof(struct ipt_log_info), |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 469 | .checkentry = log_tg_check, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | .me = THIS_MODULE, |
| 471 | }; |
| 472 | |
Patrick McHardy | 7b2f963 | 2007-12-17 22:39:08 -0800 | [diff] [blame] | 473 | static const struct nf_logger ipt_log_logger ={ |
Harald Welte | 608c8e4 | 2005-08-09 19:58:27 -0700 | [diff] [blame] | 474 | .name = "ipt_LOG", |
| 475 | .logfn = &ipt_log_packet, |
| 476 | .me = THIS_MODULE, |
| 477 | }; |
| 478 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 479 | static int __init log_tg_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | { |
Jan Engelhardt | e1fd058 | 2007-02-07 15:10:34 -0800 | [diff] [blame] | 481 | int ret; |
| 482 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 483 | ret = xt_register_target(&log_tg_reg); |
Jan Engelhardt | e1fd058 | 2007-02-07 15:10:34 -0800 | [diff] [blame] | 484 | if (ret < 0) |
| 485 | return ret; |
Patrick McHardy | 7e2acc7 | 2007-07-24 15:29:55 -0700 | [diff] [blame] | 486 | nf_log_register(PF_INET, &ipt_log_logger); |
| 487 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 490 | static void __exit log_tg_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | { |
Patrick McHardy | e92ad99 | 2007-02-12 11:11:55 -0800 | [diff] [blame] | 492 | nf_log_unregister(&ipt_log_logger); |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 493 | xt_unregister_target(&log_tg_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 496 | module_init(log_tg_init); |
| 497 | module_exit(log_tg_exit); |