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Linux/net/ipv6/netfilter/nf_log_ipv6.c

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  1 /* (C) 1999-2001 Paul `Rusty' Russell
  2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  */
  8 
  9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/module.h>
 13 #include <linux/spinlock.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/if_arp.h>
 16 #include <linux/ip.h>
 17 #include <net/ipv6.h>
 18 #include <net/icmp.h>
 19 #include <net/udp.h>
 20 #include <net/tcp.h>
 21 #include <net/route.h>
 22 
 23 #include <linux/netfilter.h>
 24 #include <linux/netfilter_ipv6/ip6_tables.h>
 25 #include <linux/netfilter/xt_LOG.h>
 26 #include <net/netfilter/nf_log.h>
 27 
 28 static struct nf_loginfo default_loginfo = {
 29         .type   = NF_LOG_TYPE_LOG,
 30         .u = {
 31                 .log = {
 32                         .level    = LOGLEVEL_NOTICE,
 33                         .logflags = NF_LOG_DEFAULT_MASK,
 34                 },
 35         },
 36 };
 37 
 38 /* One level of recursion won't kill us */
 39 static void dump_ipv6_packet(struct nf_log_buf *m,
 40                              const struct nf_loginfo *info,
 41                              const struct sk_buff *skb, unsigned int ip6hoff,
 42                              int recurse)
 43 {
 44         u_int8_t currenthdr;
 45         int fragment;
 46         struct ipv6hdr _ip6h;
 47         const struct ipv6hdr *ih;
 48         unsigned int ptr;
 49         unsigned int hdrlen = 0;
 50         unsigned int logflags;
 51 
 52         if (info->type == NF_LOG_TYPE_LOG)
 53                 logflags = info->u.log.logflags;
 54         else
 55                 logflags = NF_LOG_DEFAULT_MASK;
 56 
 57         ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
 58         if (ih == NULL) {
 59                 nf_log_buf_add(m, "TRUNCATED");
 60                 return;
 61         }
 62 
 63         /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
 64         nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
 65 
 66         /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
 67         nf_log_buf_add(m, "LEN=%zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
 68                ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
 69                (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
 70                ih->hop_limit,
 71                (ntohl(*(__be32 *)ih) & 0x000fffff));
 72 
 73         fragment = 0;
 74         ptr = ip6hoff + sizeof(struct ipv6hdr);
 75         currenthdr = ih->nexthdr;
 76         while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
 77                 struct ipv6_opt_hdr _hdr;
 78                 const struct ipv6_opt_hdr *hp;
 79 
 80                 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
 81                 if (hp == NULL) {
 82                         nf_log_buf_add(m, "TRUNCATED");
 83                         return;
 84                 }
 85 
 86                 /* Max length: 48 "OPT (...) " */
 87                 if (logflags & NF_LOG_IPOPT)
 88                         nf_log_buf_add(m, "OPT ( ");
 89 
 90                 switch (currenthdr) {
 91                 case IPPROTO_FRAGMENT: {
 92                         struct frag_hdr _fhdr;
 93                         const struct frag_hdr *fh;
 94 
 95                         nf_log_buf_add(m, "FRAG:");
 96                         fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
 97                                                 &_fhdr);
 98                         if (fh == NULL) {
 99                                 nf_log_buf_add(m, "TRUNCATED ");
100                                 return;
101                         }
102 
103                         /* Max length: 6 "65535 " */
104                         nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
105 
106                         /* Max length: 11 "INCOMPLETE " */
107                         if (fh->frag_off & htons(0x0001))
108                                 nf_log_buf_add(m, "INCOMPLETE ");
109 
110                         nf_log_buf_add(m, "ID:%08x ",
111                                        ntohl(fh->identification));
112 
113                         if (ntohs(fh->frag_off) & 0xFFF8)
114                                 fragment = 1;
115 
116                         hdrlen = 8;
117 
118                         break;
119                 }
120                 case IPPROTO_DSTOPTS:
121                 case IPPROTO_ROUTING:
122                 case IPPROTO_HOPOPTS:
123                         if (fragment) {
124                                 if (logflags & NF_LOG_IPOPT)
125                                         nf_log_buf_add(m, ")");
126                                 return;
127                         }
128                         hdrlen = ipv6_optlen(hp);
129                         break;
130                 /* Max Length */
131                 case IPPROTO_AH:
132                         if (logflags & NF_LOG_IPOPT) {
133                                 struct ip_auth_hdr _ahdr;
134                                 const struct ip_auth_hdr *ah;
135 
136                                 /* Max length: 3 "AH " */
137                                 nf_log_buf_add(m, "AH ");
138 
139                                 if (fragment) {
140                                         nf_log_buf_add(m, ")");
141                                         return;
142                                 }
143 
144                                 ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
145                                                         &_ahdr);
146                                 if (ah == NULL) {
147                                         /*
148                                          * Max length: 26 "INCOMPLETE [65535
149                                          *  bytes] )"
150                                          */
151                                         nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
152                                                        skb->len - ptr);
153                                         return;
154                                 }
155 
156                                 /* Length: 15 "SPI=0xF1234567 */
157                                 nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
158 
159                         }
160 
161                         hdrlen = (hp->hdrlen+2)<<2;
162                         break;
163                 case IPPROTO_ESP:
164                         if (logflags & NF_LOG_IPOPT) {
165                                 struct ip_esp_hdr _esph;
166                                 const struct ip_esp_hdr *eh;
167 
168                                 /* Max length: 4 "ESP " */
169                                 nf_log_buf_add(m, "ESP ");
170 
171                                 if (fragment) {
172                                         nf_log_buf_add(m, ")");
173                                         return;
174                                 }
175 
176                                 /*
177                                  * Max length: 26 "INCOMPLETE [65535 bytes] )"
178                                  */
179                                 eh = skb_header_pointer(skb, ptr, sizeof(_esph),
180                                                         &_esph);
181                                 if (eh == NULL) {
182                                         nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
183                                                        skb->len - ptr);
184                                         return;
185                                 }
186 
187                                 /* Length: 16 "SPI=0xF1234567 )" */
188                                 nf_log_buf_add(m, "SPI=0x%x )",
189                                                ntohl(eh->spi));
190                         }
191                         return;
192                 default:
193                         /* Max length: 20 "Unknown Ext Hdr 255" */
194                         nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
195                         return;
196                 }
197                 if (logflags & NF_LOG_IPOPT)
198                         nf_log_buf_add(m, ") ");
199 
200                 currenthdr = hp->nexthdr;
201                 ptr += hdrlen;
202         }
203 
204         switch (currenthdr) {
205         case IPPROTO_TCP:
206                 if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment,
207                                            ptr, logflags))
208                         return;
209                 break;
210         case IPPROTO_UDP:
211         case IPPROTO_UDPLITE:
212                 if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr))
213                         return;
214                 break;
215         case IPPROTO_ICMPV6: {
216                 struct icmp6hdr _icmp6h;
217                 const struct icmp6hdr *ic;
218 
219                 /* Max length: 13 "PROTO=ICMPv6 " */
220                 nf_log_buf_add(m, "PROTO=ICMPv6 ");
221 
222                 if (fragment)
223                         break;
224 
225                 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
226                 ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
227                 if (ic == NULL) {
228                         nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
229                                        skb->len - ptr);
230                         return;
231                 }
232 
233                 /* Max length: 18 "TYPE=255 CODE=255 " */
234                 nf_log_buf_add(m, "TYPE=%u CODE=%u ",
235                                ic->icmp6_type, ic->icmp6_code);
236 
237                 switch (ic->icmp6_type) {
238                 case ICMPV6_ECHO_REQUEST:
239                 case ICMPV6_ECHO_REPLY:
240                         /* Max length: 19 "ID=65535 SEQ=65535 " */
241                         nf_log_buf_add(m, "ID=%u SEQ=%u ",
242                                 ntohs(ic->icmp6_identifier),
243                                 ntohs(ic->icmp6_sequence));
244                         break;
245                 case ICMPV6_MGM_QUERY:
246                 case ICMPV6_MGM_REPORT:
247                 case ICMPV6_MGM_REDUCTION:
248                         break;
249 
250                 case ICMPV6_PARAMPROB:
251                         /* Max length: 17 "POINTER=ffffffff " */
252                         nf_log_buf_add(m, "POINTER=%08x ",
253                                        ntohl(ic->icmp6_pointer));
254                         /* Fall through */
255                 case ICMPV6_DEST_UNREACH:
256                 case ICMPV6_PKT_TOOBIG:
257                 case ICMPV6_TIME_EXCEED:
258                         /* Max length: 3+maxlen */
259                         if (recurse) {
260                                 nf_log_buf_add(m, "[");
261                                 dump_ipv6_packet(m, info, skb,
262                                                  ptr + sizeof(_icmp6h), 0);
263                                 nf_log_buf_add(m, "] ");
264                         }
265 
266                         /* Max length: 10 "MTU=65535 " */
267                         if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) {
268                                 nf_log_buf_add(m, "MTU=%u ",
269                                                ntohl(ic->icmp6_mtu));
270                         }
271                 }
272                 break;
273         }
274         /* Max length: 10 "PROTO=255 " */
275         default:
276                 nf_log_buf_add(m, "PROTO=%u ", currenthdr);
277         }
278 
279         /* Max length: 15 "UID=4294967295 " */
280         if ((logflags & NF_LOG_UID) && recurse)
281                 nf_log_dump_sk_uid_gid(m, skb->sk);
282 
283         /* Max length: 16 "MARK=0xFFFFFFFF " */
284         if (recurse && skb->mark)
285                 nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
286 }
287 
288 static void dump_ipv6_mac_header(struct nf_log_buf *m,
289                                  const struct nf_loginfo *info,
290                                  const struct sk_buff *skb)
291 {
292         struct net_device *dev = skb->dev;
293         unsigned int logflags = 0;
294 
295         if (info->type == NF_LOG_TYPE_LOG)
296                 logflags = info->u.log.logflags;
297 
298         if (!(logflags & NF_LOG_MACDECODE))
299                 goto fallback;
300 
301         switch (dev->type) {
302         case ARPHRD_ETHER:
303                 nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
304                        eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
305                        ntohs(eth_hdr(skb)->h_proto));
306                 return;
307         default:
308                 break;
309         }
310 
311 fallback:
312         nf_log_buf_add(m, "MAC=");
313         if (dev->hard_header_len &&
314             skb->mac_header != skb->network_header) {
315                 const unsigned char *p = skb_mac_header(skb);
316                 unsigned int len = dev->hard_header_len;
317                 unsigned int i;
318 
319                 if (dev->type == ARPHRD_SIT) {
320                         p -= ETH_HLEN;
321 
322                         if (p < skb->head)
323                                 p = NULL;
324                 }
325 
326                 if (p != NULL) {
327                         nf_log_buf_add(m, "%02x", *p++);
328                         for (i = 1; i < len; i++)
329                                 nf_log_buf_add(m, ":%02x", *p++);
330                 }
331                 nf_log_buf_add(m, " ");
332 
333                 if (dev->type == ARPHRD_SIT) {
334                         const struct iphdr *iph =
335                                 (struct iphdr *)skb_mac_header(skb);
336                         nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
337                                        &iph->daddr);
338                 }
339         } else {
340                 nf_log_buf_add(m, " ");
341         }
342 }
343 
344 static void nf_log_ip6_packet(struct net *net, u_int8_t pf,
345                               unsigned int hooknum, const struct sk_buff *skb,
346                               const struct net_device *in,
347                               const struct net_device *out,
348                               const struct nf_loginfo *loginfo,
349                               const char *prefix)
350 {
351         struct nf_log_buf *m;
352 
353         /* FIXME: Disabled from containers until syslog ns is supported */
354         if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
355                 return;
356 
357         m = nf_log_buf_open();
358 
359         if (!loginfo)
360                 loginfo = &default_loginfo;
361 
362         nf_log_dump_packet_common(m, pf, hooknum, skb, in, out,
363                                   loginfo, prefix);
364 
365         if (in != NULL)
366                 dump_ipv6_mac_header(m, loginfo, skb);
367 
368         dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);
369 
370         nf_log_buf_close(m);
371 }
372 
373 static struct nf_logger nf_ip6_logger __read_mostly = {
374         .name           = "nf_log_ipv6",
375         .type           = NF_LOG_TYPE_LOG,
376         .logfn          = nf_log_ip6_packet,
377         .me             = THIS_MODULE,
378 };
379 
380 static int __net_init nf_log_ipv6_net_init(struct net *net)
381 {
382         return nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger);
383 }
384 
385 static void __net_exit nf_log_ipv6_net_exit(struct net *net)
386 {
387         nf_log_unset(net, &nf_ip6_logger);
388 }
389 
390 static struct pernet_operations nf_log_ipv6_net_ops = {
391         .init = nf_log_ipv6_net_init,
392         .exit = nf_log_ipv6_net_exit,
393 };
394 
395 static int __init nf_log_ipv6_init(void)
396 {
397         int ret;
398 
399         ret = register_pernet_subsys(&nf_log_ipv6_net_ops);
400         if (ret < 0)
401                 return ret;
402 
403         ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger);
404         if (ret < 0) {
405                 pr_err("failed to register logger\n");
406                 goto err1;
407         }
408 
409         return 0;
410 
411 err1:
412         unregister_pernet_subsys(&nf_log_ipv6_net_ops);
413         return ret;
414 }
415 
416 static void __exit nf_log_ipv6_exit(void)
417 {
418         unregister_pernet_subsys(&nf_log_ipv6_net_ops);
419         nf_log_unregister(&nf_ip6_logger);
420 }
421 
422 module_init(nf_log_ipv6_init);
423 module_exit(nf_log_ipv6_exit);
424 
425 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
426 MODULE_DESCRIPTION("Netfilter IPv6 packet logging");
427 MODULE_LICENSE("GPL");
428 MODULE_ALIAS_NF_LOGGER(AF_INET6, 0);
429 

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