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netfilter: nfnetlink: add struct nfnl_info and pass it to callbacks
[linux-block.git] / net / netfilter / nf_log_syslog.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
83e96d44
PNA		 2/* (C) 1999-2001 Paul `Rusty' Russell
3 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
83e96d44 4 */
a81b2ce8 5
8ac2bde2 6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
83e96d44 7
a81b2ce8 8#include <linux/kernel.h>
83e96d44
PNA		 9#include <linux/module.h>
10#include <linux/spinlock.h>
11#include <linux/skbuff.h>
12#include <linux/if_arp.h>
13#include <linux/ip.h>
14#include <net/ipv6.h>
15#include <net/icmp.h>
16#include <net/udp.h>
17#include <net/tcp.h>
18#include <net/route.h>
19
20#include <linux/netfilter.h>
e465cccd 21#include <linux/netfilter_bridge.h>
f5466caa 22#include <linux/netfilter_ipv6.h>
83e96d44
PNA		 23#include <linux/netfilter/xt_LOG.h>
24#include <net/netfilter/nf_log.h>
25
549d2d41 26static const struct nf_loginfo default_loginfo = {
83e96d44
PNA		 27 .type = NF_LOG_TYPE_LOG,
28 .u = {
29 .log = {
a81b2ce8 30 .level = LOGLEVEL_NOTICE,
ff107d27 31 .logflags = NF_LOG_DEFAULT_MASK,
83e96d44
PNA		 32 },
33 },
34};
35
f11d61e7
FW		 36struct arppayload {
37 unsigned char mac_src[ETH_ALEN];
38 unsigned char ip_src[4];
39 unsigned char mac_dst[ETH_ALEN];
40 unsigned char ip_dst[4];
41};
42
e465cccd
FW		 43static void nf_log_dump_vlan(struct nf_log_buf *m, const struct sk_buff *skb)
44{
45 u16 vid;
46
47 if (!skb_vlan_tag_present(skb))
48 return;
49
50 vid = skb_vlan_tag_get(skb);
51 nf_log_buf_add(m, "VPROTO=%04x VID=%u ", ntohs(skb->vlan_proto), vid);
52}
f11d61e7
FW		 53static void noinline_for_stack
54dump_arp_packet(struct nf_log_buf *m,
55 const struct nf_loginfo *info,
56 const struct sk_buff *skb, unsigned int nhoff)
57{
58 const struct arppayload *ap;
59 struct arppayload _arpp;
60 const struct arphdr *ah;
61 unsigned int logflags;
62 struct arphdr _arph;
63
64 ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
65 if (!ah) {
66 nf_log_buf_add(m, "TRUNCATED");
67 return;
68 }
69
70 if (info->type == NF_LOG_TYPE_LOG)
71 logflags = info->u.log.logflags;
72 else
73 logflags = NF_LOG_DEFAULT_MASK;
74
75 if (logflags & NF_LOG_MACDECODE) {
76 nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
77 eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
78 nf_log_dump_vlan(m, skb);
79 nf_log_buf_add(m, "MACPROTO=%04x ",
80 ntohs(eth_hdr(skb)->h_proto));
81 }
82
83 nf_log_buf_add(m, "ARP HTYPE=%d PTYPE=0x%04x OPCODE=%d",
84 ntohs(ah->ar_hrd), ntohs(ah->ar_pro), ntohs(ah->ar_op));
85 /* If it's for Ethernet and the lengths are OK, then log the ARP
86 * payload.
87 */
88 if (ah->ar_hrd != htons(ARPHRD_ETHER) ||
89 ah->ar_hln != ETH_ALEN ||
90 ah->ar_pln != sizeof(__be32))
91 return;
92
93 ap = skb_header_pointer(skb, sizeof(_arph), sizeof(_arpp), &_arpp);
94 if (!ap) {
95 nf_log_buf_add(m, " INCOMPLETE [%zu bytes]",
96 skb->len - sizeof(_arph));
97 return;
98 }
99 nf_log_buf_add(m, " MACSRC=%pM IPSRC=%pI4 MACDST=%pM IPDST=%pI4",
100 ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst);
101}
102
e465cccd
FW		 103static void
104nf_log_dump_packet_common(struct nf_log_buf *m, u8 pf,
105 unsigned int hooknum, const struct sk_buff *skb,
106 const struct net_device *in,
107 const struct net_device *out,
108 const struct nf_loginfo *loginfo, const char *prefix)
109{
110 const struct net_device *physoutdev __maybe_unused;
111 const struct net_device *physindev __maybe_unused;
112
113 nf_log_buf_add(m, KERN_SOH "%c%sIN=%s OUT=%s ",
114 '0' + loginfo->u.log.level, prefix,
115 in ? in->name : "",
116 out ? out->name : "");
117#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
118 physindev = nf_bridge_get_physindev(skb);
119 if (physindev && in != physindev)
120 nf_log_buf_add(m, "PHYSIN=%s ", physindev->name);
121 physoutdev = nf_bridge_get_physoutdev(skb);
122 if (physoutdev && out != physoutdev)
123 nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name);
124#endif
125}
126
f11d61e7
FW		 127static void nf_log_arp_packet(struct net *net, u_int8_t pf,
128 unsigned int hooknum, const struct sk_buff *skb,
129 const struct net_device *in,
130 const struct net_device *out,
131 const struct nf_loginfo *loginfo,
132 const char *prefix)
133{
134 struct nf_log_buf *m;
135
136 /* FIXME: Disabled from containers until syslog ns is supported */
137 if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
138 return;
139
140 m = nf_log_buf_open();
141
142 if (!loginfo)
143 loginfo = &default_loginfo;
144
145 nf_log_dump_packet_common(m, pf, hooknum, skb, in, out, loginfo,
146 prefix);
147 dump_arp_packet(m, loginfo, skb, 0);
148
149 nf_log_buf_close(m);
150}
151
152static struct nf_logger nf_arp_logger __read_mostly = {
153 .name = "nf_log_arp",
154 .type = NF_LOG_TYPE_LOG,
155 .logfn = nf_log_arp_packet,
156 .me = THIS_MODULE,
157};
158
e465cccd
FW		 159static void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m,
160 struct sock *sk)
161{
162 if (!sk || !sk_fullsock(sk) || !net_eq(net, sock_net(sk)))
163 return;
164
165 read_lock_bh(&sk->sk_callback_lock);
166 if (sk->sk_socket && sk->sk_socket->file) {
167 const struct cred *cred = sk->sk_socket->file->f_cred;
168
169 nf_log_buf_add(m, "UID=%u GID=%u ",
170 from_kuid_munged(&init_user_ns, cred->fsuid),
171 from_kgid_munged(&init_user_ns, cred->fsgid));
172 }
173 read_unlock_bh(&sk->sk_callback_lock);
174}
175
176static noinline_for_stack int
177nf_log_dump_tcp_header(struct nf_log_buf *m,
178 const struct sk_buff *skb,
179 u8 proto, int fragment,
180 unsigned int offset,
181 unsigned int logflags)
182{
183 struct tcphdr _tcph;
184 const struct tcphdr *th;
185
186 /* Max length: 10 "PROTO=TCP " */
187 nf_log_buf_add(m, "PROTO=TCP ");
188
189 if (fragment)
190 return 0;
191
192 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
193 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
194 if (!th) {
195 nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
196 return 1;
197 }
198
199 /* Max length: 20 "SPT=65535 DPT=65535 " */
200 nf_log_buf_add(m, "SPT=%u DPT=%u ",
201 ntohs(th->source), ntohs(th->dest));
202 /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
203 if (logflags & NF_LOG_TCPSEQ) {
204 nf_log_buf_add(m, "SEQ=%u ACK=%u ",
205 ntohl(th->seq), ntohl(th->ack_seq));
206 }
207
208 /* Max length: 13 "WINDOW=65535 " */
209 nf_log_buf_add(m, "WINDOW=%u ", ntohs(th->window));
210 /* Max length: 9 "RES=0x3C " */
211 nf_log_buf_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) &
212 TCP_RESERVED_BITS) >> 22));
213 /* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
214 if (th->cwr)
215 nf_log_buf_add(m, "CWR ");
216 if (th->ece)
217 nf_log_buf_add(m, "ECE ");
218 if (th->urg)
219 nf_log_buf_add(m, "URG ");
220 if (th->ack)
221 nf_log_buf_add(m, "ACK ");
222 if (th->psh)
223 nf_log_buf_add(m, "PSH ");
224 if (th->rst)
225 nf_log_buf_add(m, "RST ");
226 if (th->syn)
227 nf_log_buf_add(m, "SYN ");
228 if (th->fin)
229 nf_log_buf_add(m, "FIN ");
230 /* Max length: 11 "URGP=65535 " */
231 nf_log_buf_add(m, "URGP=%u ", ntohs(th->urg_ptr));
232
233 if ((logflags & NF_LOG_TCPOPT) && th->doff * 4 > sizeof(struct tcphdr)) {
234 unsigned int optsize = th->doff * 4 - sizeof(struct tcphdr);
235 u8 _opt[60 - sizeof(struct tcphdr)];
236 unsigned int i;
237 const u8 *op;
238
239 op = skb_header_pointer(skb, offset + sizeof(struct tcphdr),
240 optsize, _opt);
241 if (!op) {
242 nf_log_buf_add(m, "OPT (TRUNCATED)");
243 return 1;
244 }
245
246 /* Max length: 127 "OPT (" 15*4*2chars ") " */
247 nf_log_buf_add(m, "OPT (");
248 for (i = 0; i < optsize; i++)
249 nf_log_buf_add(m, "%02X", op[i]);
250
251 nf_log_buf_add(m, ") ");
252 }
253
254 return 0;
255}
256
257static noinline_for_stack int
258nf_log_dump_udp_header(struct nf_log_buf *m,
259 const struct sk_buff *skb,
260 u8 proto, int fragment,
261 unsigned int offset)
262{
263 struct udphdr _udph;
264 const struct udphdr *uh;
265
266 if (proto == IPPROTO_UDP)
267 /* Max length: 10 "PROTO=UDP " */
268 nf_log_buf_add(m, "PROTO=UDP ");
269 else /* Max length: 14 "PROTO=UDPLITE " */
270 nf_log_buf_add(m, "PROTO=UDPLITE ");
271
272 if (fragment)
273 goto out;
274
275 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
276 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
277 if (!uh) {
278 nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
279
280 return 1;
281 }
282
283 /* Max length: 20 "SPT=65535 DPT=65535 " */
284 nf_log_buf_add(m, "SPT=%u DPT=%u LEN=%u ",
285 ntohs(uh->source), ntohs(uh->dest), ntohs(uh->len));
286
287out:
288 return 0;
289}
290
83e96d44 291/* One level of recursion won't kill us */
db3187ae
FW		 292static noinline_for_stack void
293dump_ipv4_packet(struct net *net, struct nf_log_buf *m,
294 const struct nf_loginfo *info,
295 const struct sk_buff *skb, unsigned int iphoff)
83e96d44 296{
83e96d44
PNA		 297 const struct iphdr *ih;
298 unsigned int logflags;
db3187ae 299 struct iphdr _iph;
83e96d44
PNA		 300
301 if (info->type == NF_LOG_TYPE_LOG)
302 logflags = info->u.log.logflags;
303 else
ff107d27 304 logflags = NF_LOG_DEFAULT_MASK;
83e96d44
PNA		 305
306 ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
db3187ae 307 if (!ih) {
83e96d44
PNA		 308 nf_log_buf_add(m, "TRUNCATED");
309 return;
310 }
311
312 /* Important fields:
db3187ae
FW		 313 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options.
314 * Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 "
315 */
83e96d44
PNA		 316 nf_log_buf_add(m, "SRC=%pI4 DST=%pI4 ", &ih->saddr, &ih->daddr);
317
318 /* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
319 nf_log_buf_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
320 ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
321 ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
322
323 /* Max length: 6 "CE DF MF " */
324 if (ntohs(ih->frag_off) & IP_CE)
325 nf_log_buf_add(m, "CE ");
326 if (ntohs(ih->frag_off) & IP_DF)
327 nf_log_buf_add(m, "DF ");
328 if (ntohs(ih->frag_off) & IP_MF)
329 nf_log_buf_add(m, "MF ");
330
331 /* Max length: 11 "FRAG:65535 " */
332 if (ntohs(ih->frag_off) & IP_OFFSET)
333 nf_log_buf_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
334
8cb2a7d5 335 if ((logflags & NF_LOG_IPOPT) &&
83e96d44 336 ih->ihl * 4 > sizeof(struct iphdr)) {
83e96d44 337 unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
db3187ae 338 const unsigned char *op;
83e96d44
PNA		 339 unsigned int i, optsize;
340
341 optsize = ih->ihl * 4 - sizeof(struct iphdr);
db3187ae 342 op = skb_header_pointer(skb, iphoff + sizeof(_iph),
83e96d44 343 optsize, _opt);
db3187ae 344 if (!op) {
83e96d44
PNA		 345 nf_log_buf_add(m, "TRUNCATED");
346 return;
347 }
348
349 /* Max length: 127 "OPT (" 15*4*2chars ") " */
350 nf_log_buf_add(m, "OPT (");
351 for (i = 0; i < optsize; i++)
352 nf_log_buf_add(m, "%02X", op[i]);
353 nf_log_buf_add(m, ") ");
354 }
355
356 switch (ih->protocol) {
357 case IPPROTO_TCP:
358 if (nf_log_dump_tcp_header(m, skb, ih->protocol,
359 ntohs(ih->frag_off) & IP_OFFSET,
db3187ae 360 iphoff + ih->ihl * 4, logflags))
83e96d44
PNA		 361 return;
362 break;
363 case IPPROTO_UDP:
364 case IPPROTO_UDPLITE:
365 if (nf_log_dump_udp_header(m, skb, ih->protocol,
366 ntohs(ih->frag_off) & IP_OFFSET,
db3187ae 367 iphoff + ih->ihl * 4))
83e96d44
PNA		 368 return;
369 break;
370 case IPPROTO_ICMP: {
db3187ae
FW		 371 static const size_t required_len[NR_ICMP_TYPES + 1] = {
372 [ICMP_ECHOREPLY] = 4,
373 [ICMP_DEST_UNREACH] = 8 + sizeof(struct iphdr),
374 [ICMP_SOURCE_QUENCH] = 8 + sizeof(struct iphdr),
375 [ICMP_REDIRECT] = 8 + sizeof(struct iphdr),
376 [ICMP_ECHO] = 4,
377 [ICMP_TIME_EXCEEDED] = 8 + sizeof(struct iphdr),
378 [ICMP_PARAMETERPROB] = 8 + sizeof(struct iphdr),
379 [ICMP_TIMESTAMP] = 20,
380 [ICMP_TIMESTAMPREPLY] = 20,
381 [ICMP_ADDRESS] = 12,
382 [ICMP_ADDRESSREPLY] = 12 };
83e96d44 383 const struct icmphdr *ich;
db3187ae 384 struct icmphdr _icmph;
83e96d44
PNA		 385
386 /* Max length: 11 "PROTO=ICMP " */
387 nf_log_buf_add(m, "PROTO=ICMP ");
388
389 if (ntohs(ih->frag_off) & IP_OFFSET)
390 break;
391
392 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
393 ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
394 sizeof(_icmph), &_icmph);
db3187ae 395 if (!ich) {
83e96d44 396 nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
db3187ae 397 skb->len - iphoff - ih->ihl * 4);
83e96d44
PNA		 398 break;
399 }
400
401 /* Max length: 18 "TYPE=255 CODE=255 " */
402 nf_log_buf_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);
403
404 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
405 if (ich->type <= NR_ICMP_TYPES &&
406 required_len[ich->type] &&
db3187ae 407 skb->len - iphoff - ih->ihl * 4 < required_len[ich->type]) {
83e96d44 408 nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
db3187ae 409 skb->len - iphoff - ih->ihl * 4);
83e96d44
PNA		 410 break;
411 }
412
413 switch (ich->type) {
414 case ICMP_ECHOREPLY:
415 case ICMP_ECHO:
416 /* Max length: 19 "ID=65535 SEQ=65535 " */
417 nf_log_buf_add(m, "ID=%u SEQ=%u ",
418 ntohs(ich->un.echo.id),
419 ntohs(ich->un.echo.sequence));
420 break;
421
422 case ICMP_PARAMETERPROB:
423 /* Max length: 14 "PARAMETER=255 " */
424 nf_log_buf_add(m, "PARAMETER=%u ",
425 ntohl(ich->un.gateway) >> 24);
426 break;
427 case ICMP_REDIRECT:
428 /* Max length: 24 "GATEWAY=255.255.255.255 " */
429 nf_log_buf_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
a8eceea8 430 fallthrough;
83e96d44
PNA		 431 case ICMP_DEST_UNREACH:
432 case ICMP_SOURCE_QUENCH:
433 case ICMP_TIME_EXCEEDED:
434 /* Max length: 3+maxlen */
435 if (!iphoff) { /* Only recurse once. */
436 nf_log_buf_add(m, "[");
f5646501 437 dump_ipv4_packet(net, m, info, skb,
db3187ae 438 iphoff + ih->ihl * 4 + sizeof(_icmph));
83e96d44
PNA		 439 nf_log_buf_add(m, "] ");
440 }
441
442 /* Max length: 10 "MTU=65535 " */
443 if (ich->type == ICMP_DEST_UNREACH &&
444 ich->code == ICMP_FRAG_NEEDED) {
445 nf_log_buf_add(m, "MTU=%u ",
446 ntohs(ich->un.frag.mtu));
447 }
448 }
449 break;
450 }
451 /* Max Length */
452 case IPPROTO_AH: {
83e96d44 453 const struct ip_auth_hdr *ah;
db3187ae 454 struct ip_auth_hdr _ahdr;
83e96d44
PNA		 455
456 if (ntohs(ih->frag_off) & IP_OFFSET)
457 break;
458
459 /* Max length: 9 "PROTO=AH " */
460 nf_log_buf_add(m, "PROTO=AH ");
461
462 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
db3187ae 463 ah = skb_header_pointer(skb, iphoff + ih->ihl * 4,
83e96d44 464 sizeof(_ahdr), &_ahdr);
db3187ae 465 if (!ah) {
83e96d44 466 nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
db3187ae 467 skb->len - iphoff - ih->ihl * 4);
83e96d44
PNA		 468 break;
469 }
470
471 /* Length: 15 "SPI=0xF1234567 " */
472 nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
473 break;
474 }
475 case IPPROTO_ESP: {
83e96d44 476 const struct ip_esp_hdr *eh;
db3187ae 477 struct ip_esp_hdr _esph;
83e96d44
PNA		 478
479 /* Max length: 10 "PROTO=ESP " */
480 nf_log_buf_add(m, "PROTO=ESP ");
481
482 if (ntohs(ih->frag_off) & IP_OFFSET)
483 break;
484
485 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
db3187ae 486 eh = skb_header_pointer(skb, iphoff + ih->ihl * 4,
83e96d44 487 sizeof(_esph), &_esph);
db3187ae 488 if (!eh) {
83e96d44 489 nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
db3187ae 490 skb->len - iphoff - ih->ihl * 4);
83e96d44
PNA		 491 break;
492 }
493
494 /* Length: 15 "SPI=0xF1234567 " */
495 nf_log_buf_add(m, "SPI=0x%x ", ntohl(eh->spi));
496 break;
497 }
498 /* Max length: 10 "PROTO 255 " */
499 default:
500 nf_log_buf_add(m, "PROTO=%u ", ih->protocol);
501 }
502
503 /* Max length: 15 "UID=4294967295 " */
8cb2a7d5 504 if ((logflags & NF_LOG_UID) && !iphoff)
f5646501 505 nf_log_dump_sk_uid_gid(net, m, skb->sk);
83e96d44
PNA		 506
507 /* Max length: 16 "MARK=0xFFFFFFFF " */
508 if (!iphoff && skb->mark)
509 nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
510
511 /* Proto Max log string length */
512 /* IP: 40+46+6+11+127 = 230 */
513 /* TCP: 10+max(25,20+30+13+9+32+11+127) = 252 */
514 /* UDP: 10+max(25,20) = 35 */
515 /* UDPLITE: 14+max(25,20) = 39 */
516 /* ICMP: 11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
517 /* ESP: 10+max(25)+15 = 50 */
518 /* AH: 9+max(25)+15 = 49 */
519 /* unknown: 10 */
520
521 /* (ICMP allows recursion one level deep) */
522 /* maxlen = IP + ICMP + IP + max(TCP,UDP,ICMP,unknown) */
523 /* maxlen = 230+ 91 + 230 + 252 = 803 */
524}
525
f5466caa
FW		 526static noinline_for_stack void
527dump_ipv6_packet(struct net *net, struct nf_log_buf *m,
528 const struct nf_loginfo *info,
529 const struct sk_buff *skb, unsigned int ip6hoff,
530 int recurse)
531{
532 const struct ipv6hdr *ih;
533 unsigned int hdrlen = 0;
534 unsigned int logflags;
535 struct ipv6hdr _ip6h;
536 unsigned int ptr;
537 u8 currenthdr;
538 int fragment;
539
540 if (info->type == NF_LOG_TYPE_LOG)
541 logflags = info->u.log.logflags;
542 else
543 logflags = NF_LOG_DEFAULT_MASK;
544
545 ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
546 if (!ih) {
547 nf_log_buf_add(m, "TRUNCATED");
548 return;
549 }
550
551 /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
552 nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
553
554 /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
555 nf_log_buf_add(m, "LEN=%zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
556 ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
557 (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
558 ih->hop_limit,
559 (ntohl(*(__be32 *)ih) & 0x000fffff));
560
561 fragment = 0;
562 ptr = ip6hoff + sizeof(struct ipv6hdr);
563 currenthdr = ih->nexthdr;
564 while (currenthdr != NEXTHDR_NONE && nf_ip6_ext_hdr(currenthdr)) {
565 struct ipv6_opt_hdr _hdr;
566 const struct ipv6_opt_hdr *hp;
567
568 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
569 if (!hp) {
570 nf_log_buf_add(m, "TRUNCATED");
571 return;
572 }
573
574 /* Max length: 48 "OPT (...) " */
575 if (logflags & NF_LOG_IPOPT)
576 nf_log_buf_add(m, "OPT ( ");
577
578 switch (currenthdr) {
579 case IPPROTO_FRAGMENT: {
580 struct frag_hdr _fhdr;
581 const struct frag_hdr *fh;
582
583 nf_log_buf_add(m, "FRAG:");
584 fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
585 &_fhdr);
586 if (!fh) {
587 nf_log_buf_add(m, "TRUNCATED ");
588 return;
589 }
590
591 /* Max length: 6 "65535 " */
592 nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
593
594 /* Max length: 11 "INCOMPLETE " */
595 if (fh->frag_off & htons(0x0001))
596 nf_log_buf_add(m, "INCOMPLETE ");
597
598 nf_log_buf_add(m, "ID:%08x ",
599 ntohl(fh->identification));
600
601 if (ntohs(fh->frag_off) & 0xFFF8)
602 fragment = 1;
603
604 hdrlen = 8;
605 break;
606 }
607 case IPPROTO_DSTOPTS:
608 case IPPROTO_ROUTING:
609 case IPPROTO_HOPOPTS:
610 if (fragment) {
611 if (logflags & NF_LOG_IPOPT)
612 nf_log_buf_add(m, ")");
613 return;
614 }
615 hdrlen = ipv6_optlen(hp);
616 break;
617 /* Max Length */
618 case IPPROTO_AH:
619 if (logflags & NF_LOG_IPOPT) {
620 struct ip_auth_hdr _ahdr;
621 const struct ip_auth_hdr *ah;
622
623 /* Max length: 3 "AH " */
624 nf_log_buf_add(m, "AH ");
625
626 if (fragment) {
627 nf_log_buf_add(m, ")");
628 return;
629 }
630
631 ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
632 &_ahdr);
633 if (!ah) {
634 /* Max length: 26 "INCOMPLETE [65535 bytes] )" */
635 nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
636 skb->len - ptr);
637 return;
638 }
639
640 /* Length: 15 "SPI=0xF1234567 */
641 nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
642 }
643
644 hdrlen = ipv6_authlen(hp);
645 break;
646 case IPPROTO_ESP:
647 if (logflags & NF_LOG_IPOPT) {
648 struct ip_esp_hdr _esph;
649 const struct ip_esp_hdr *eh;
650
651 /* Max length: 4 "ESP " */
652 nf_log_buf_add(m, "ESP ");
653
654 if (fragment) {
655 nf_log_buf_add(m, ")");
656 return;
657 }
658
659 /* Max length: 26 "INCOMPLETE [65535 bytes] )" */
660 eh = skb_header_pointer(skb, ptr, sizeof(_esph),
661 &_esph);
662 if (!eh) {
663 nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
664 skb->len - ptr);
665 return;
666 }
667
668 /* Length: 16 "SPI=0xF1234567 )" */
669 nf_log_buf_add(m, "SPI=0x%x )",
670 ntohl(eh->spi));
671 }
672 return;
673 default:
674 /* Max length: 20 "Unknown Ext Hdr 255" */
675 nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
676 return;
677 }
678 if (logflags & NF_LOG_IPOPT)
679 nf_log_buf_add(m, ") ");
680
681 currenthdr = hp->nexthdr;
682 ptr += hdrlen;
683 }
684
685 switch (currenthdr) {
686 case IPPROTO_TCP:
687 if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment,
688 ptr, logflags))
689 return;
690 break;
691 case IPPROTO_UDP:
692 case IPPROTO_UDPLITE:
693 if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr))
694 return;
695 break;
696 case IPPROTO_ICMPV6: {
697 struct icmp6hdr _icmp6h;
698 const struct icmp6hdr *ic;
699
700 /* Max length: 13 "PROTO=ICMPv6 " */
701 nf_log_buf_add(m, "PROTO=ICMPv6 ");
702
703 if (fragment)
704 break;
705
706 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
707 ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
708 if (!ic) {
709 nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
710 skb->len - ptr);
711 return;
712 }
713
714 /* Max length: 18 "TYPE=255 CODE=255 " */
715 nf_log_buf_add(m, "TYPE=%u CODE=%u ",
716 ic->icmp6_type, ic->icmp6_code);
717
718 switch (ic->icmp6_type) {
719 case ICMPV6_ECHO_REQUEST:
720 case ICMPV6_ECHO_REPLY:
721 /* Max length: 19 "ID=65535 SEQ=65535 " */
722 nf_log_buf_add(m, "ID=%u SEQ=%u ",
723 ntohs(ic->icmp6_identifier),
724 ntohs(ic->icmp6_sequence));
725 break;
726 case ICMPV6_MGM_QUERY:
727 case ICMPV6_MGM_REPORT:
728 case ICMPV6_MGM_REDUCTION:
729 break;
730
731 case ICMPV6_PARAMPROB:
732 /* Max length: 17 "POINTER=ffffffff " */
733 nf_log_buf_add(m, "POINTER=%08x ",
734 ntohl(ic->icmp6_pointer));
735 fallthrough;
736 case ICMPV6_DEST_UNREACH:
737 case ICMPV6_PKT_TOOBIG:
738 case ICMPV6_TIME_EXCEED:
739 /* Max length: 3+maxlen */
740 if (recurse) {
741 nf_log_buf_add(m, "[");
742 dump_ipv6_packet(net, m, info, skb,
743 ptr + sizeof(_icmp6h), 0);
744 nf_log_buf_add(m, "] ");
745 }
746
747 /* Max length: 10 "MTU=65535 " */
748 if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) {
749 nf_log_buf_add(m, "MTU=%u ",
750 ntohl(ic->icmp6_mtu));
751 }
752 }
753 break;
754 }
755 /* Max length: 10 "PROTO=255 " */
756 default:
757 nf_log_buf_add(m, "PROTO=%u ", currenthdr);
758 }
759
760 /* Max length: 15 "UID=4294967295 " */
761 if ((logflags & NF_LOG_UID) && recurse)
762 nf_log_dump_sk_uid_gid(net, m, skb->sk);
763
764 /* Max length: 16 "MARK=0xFFFFFFFF " */
765 if (recurse && skb->mark)
766 nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
767}
768
83e96d44 769static void dump_ipv4_mac_header(struct nf_log_buf *m,
db3187ae
FW		 770 const struct nf_loginfo *info,
771 const struct sk_buff *skb)
83e96d44
PNA		 772{
773 struct net_device *dev = skb->dev;
774 unsigned int logflags = 0;
775
776 if (info->type == NF_LOG_TYPE_LOG)
777 logflags = info->u.log.logflags;
778
8cb2a7d5 779 if (!(logflags & NF_LOG_MACDECODE))
83e96d44
PNA		 780 goto fallback;
781
782 switch (dev->type) {
783 case ARPHRD_ETHER:
0d9826bc
PNA		 784 nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
785 eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
786 nf_log_dump_vlan(m, skb);
787 nf_log_buf_add(m, "MACPROTO=%04x ",
83e96d44
PNA		 788 ntohs(eth_hdr(skb)->h_proto));
789 return;
790 default:
791 break;
792 }
793
794fallback:
795 nf_log_buf_add(m, "MAC=");
796 if (dev->hard_header_len &&
797 skb->mac_header != skb->network_header) {
798 const unsigned char *p = skb_mac_header(skb);
799 unsigned int i;
800
801 nf_log_buf_add(m, "%02x", *p++);
802 for (i = 1; i < dev->hard_header_len; i++, p++)
803 nf_log_buf_add(m, ":%02x", *p);
804 }
805 nf_log_buf_add(m, " ");
806}
807
fab4085f
PNA		 808static void nf_log_ip_packet(struct net *net, u_int8_t pf,
809 unsigned int hooknum, const struct sk_buff *skb,
810 const struct net_device *in,
811 const struct net_device *out,
812 const struct nf_loginfo *loginfo,
813 const char *prefix)
83e96d44
PNA		 814{
815 struct nf_log_buf *m;
816
817 /* FIXME: Disabled from containers until syslog ns is supported */
2851940f 818 if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
83e96d44
PNA		 819 return;
820
821 m = nf_log_buf_open();
822
823 if (!loginfo)
824 loginfo = &default_loginfo;
825
826 nf_log_dump_packet_common(m, pf, hooknum, skb, in,
827 out, loginfo, prefix);
828
db3187ae 829 if (in)
83e96d44
PNA		 830 dump_ipv4_mac_header(m, loginfo, skb);
831
f5646501 832 dump_ipv4_packet(net, m, loginfo, skb, 0);
83e96d44
PNA		 833
834 nf_log_buf_close(m);
835}
83e96d44
PNA		 836
837static struct nf_logger nf_ip_logger __read_mostly = {
838 .name = "nf_log_ipv4",
839 .type = NF_LOG_TYPE_LOG,
840 .logfn = nf_log_ip_packet,
841 .me = THIS_MODULE,
842};
843
f5466caa
FW		 844static void dump_ipv6_mac_header(struct nf_log_buf *m,
845 const struct nf_loginfo *info,
846 const struct sk_buff *skb)
847{
848 struct net_device *dev = skb->dev;
849 unsigned int logflags = 0;
850
851 if (info->type == NF_LOG_TYPE_LOG)
852 logflags = info->u.log.logflags;
853
854 if (!(logflags & NF_LOG_MACDECODE))
855 goto fallback;
856
857 switch (dev->type) {
858 case ARPHRD_ETHER:
859 nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
860 eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
861 nf_log_dump_vlan(m, skb);
862 nf_log_buf_add(m, "MACPROTO=%04x ",
863 ntohs(eth_hdr(skb)->h_proto));
864 return;
865 default:
866 break;
867 }
868
869fallback:
870 nf_log_buf_add(m, "MAC=");
871 if (dev->hard_header_len &&
872 skb->mac_header != skb->network_header) {
873 const unsigned char *p = skb_mac_header(skb);
874 unsigned int len = dev->hard_header_len;
875 unsigned int i;
876
877 if (dev->type == ARPHRD_SIT) {
878 p -= ETH_HLEN;
879
880 if (p < skb->head)
881 p = NULL;
882 }
883
884 if (p) {
885 nf_log_buf_add(m, "%02x", *p++);
886 for (i = 1; i < len; i++)
887 nf_log_buf_add(m, ":%02x", *p++);
888 }
889 nf_log_buf_add(m, " ");
890
891 if (dev->type == ARPHRD_SIT) {
892 const struct iphdr *iph =
893 (struct iphdr *)skb_mac_header(skb);
894 nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
895 &iph->daddr);
896 }
897 } else {
898 nf_log_buf_add(m, " ");
899 }
900}
901
902static void nf_log_ip6_packet(struct net *net, u_int8_t pf,
903 unsigned int hooknum, const struct sk_buff *skb,
904 const struct net_device *in,
905 const struct net_device *out,
906 const struct nf_loginfo *loginfo,
907 const char *prefix)
908{
909 struct nf_log_buf *m;
910
911 /* FIXME: Disabled from containers until syslog ns is supported */
912 if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
913 return;
914
915 m = nf_log_buf_open();
916
917 if (!loginfo)
918 loginfo = &default_loginfo;
919
920 nf_log_dump_packet_common(m, pf, hooknum, skb, in, out,
921 loginfo, prefix);
922
923 if (in)
924 dump_ipv6_mac_header(m, loginfo, skb);
925
926 dump_ipv6_packet(net, m, loginfo, skb, skb_network_offset(skb), 1);
927
928 nf_log_buf_close(m);
929}
930
931static struct nf_logger nf_ip6_logger __read_mostly = {
932 .name = "nf_log_ipv6",
933 .type = NF_LOG_TYPE_LOG,
934 .logfn = nf_log_ip6_packet,
935 .me = THIS_MODULE,
936};
937
1510618e
FW		 938static void nf_log_netdev_packet(struct net *net, u_int8_t pf,
939 unsigned int hooknum,
940 const struct sk_buff *skb,
941 const struct net_device *in,
942 const struct net_device *out,
943 const struct nf_loginfo *loginfo,
944 const char *prefix)
945{
e465cccd
FW		 946 switch (skb->protocol) {
947 case htons(ETH_P_IP):
948 nf_log_ip_packet(net, pf, hooknum, skb, in, out, loginfo, prefix);
949 break;
950 case htons(ETH_P_IPV6):
951 nf_log_ip6_packet(net, pf, hooknum, skb, in, out, loginfo, prefix);
952 break;
953 case htons(ETH_P_ARP):
954 case htons(ETH_P_RARP):
955 nf_log_arp_packet(net, pf, hooknum, skb, in, out, loginfo, prefix);
956 break;
957 }
1510618e
FW		 958}
959
960static struct nf_logger nf_netdev_logger __read_mostly = {
961 .name = "nf_log_netdev",
962 .type = NF_LOG_TYPE_LOG,
963 .logfn = nf_log_netdev_packet,
964 .me = THIS_MODULE,
965};
966
77ccee96
FW		 967static struct nf_logger nf_bridge_logger __read_mostly = {
968 .name = "nf_log_bridge",
969 .type = NF_LOG_TYPE_LOG,
970 .logfn = nf_log_netdev_packet,
971 .me = THIS_MODULE,
972};
973
db3187ae 974static int __net_init nf_log_syslog_net_init(struct net *net)
83e96d44 975{
f11d61e7
FW		 976 int ret = nf_log_set(net, NFPROTO_IPV4, &nf_ip_logger);
977
978 if (ret)
979 return ret;
980
981 ret = nf_log_set(net, NFPROTO_ARP, &nf_arp_logger);
982 if (ret)
983 goto err1;
f5466caa
FW		 984
985 ret = nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger);
986 if (ret)
987 goto err2;
1510618e
FW		 988
989 ret = nf_log_set(net, NFPROTO_NETDEV, &nf_netdev_logger);
990 if (ret)
991 goto err3;
77ccee96
FW		 992
993 ret = nf_log_set(net, NFPROTO_BRIDGE, &nf_bridge_logger);
994 if (ret)
995 goto err4;
f5466caa 996 return 0;
77ccee96
FW		 997err4:
998 nf_log_unset(net, &nf_netdev_logger);
1510618e
FW		 999err3:
1000 nf_log_unset(net, &nf_ip6_logger);
f5466caa 1001err2:
f11d61e7 1002 nf_log_unset(net, &nf_arp_logger);
f5466caa
FW		 1003err1:
1004 nf_log_unset(net, &nf_ip_logger);
f11d61e7 1005 return ret;
83e96d44
PNA		 1006}
1007
db3187ae 1008static void __net_exit nf_log_syslog_net_exit(struct net *net)
83e96d44
PNA		 1009{
1010 nf_log_unset(net, &nf_ip_logger);
f11d61e7 1011 nf_log_unset(net, &nf_arp_logger);
1510618e
FW		 1012 nf_log_unset(net, &nf_ip6_logger);
1013 nf_log_unset(net, &nf_netdev_logger);
593268dd 1014 nf_log_unset(net, &nf_bridge_logger);
83e96d44
PNA		 1015}
1016
db3187ae
FW		 1017static struct pernet_operations nf_log_syslog_net_ops = {
1018 .init = nf_log_syslog_net_init,
1019 .exit = nf_log_syslog_net_exit,
83e96d44
PNA		 1020};
1021
db3187ae 1022static int __init nf_log_syslog_init(void)
83e96d44
PNA		 1023{
1024 int ret;
1025
db3187ae 1026 ret = register_pernet_subsys(&nf_log_syslog_net_ops);
83e96d44
PNA		 1027 if (ret < 0)
1028 return ret;
1029
8ac2bde2 1030 ret = nf_log_register(NFPROTO_IPV4, &nf_ip_logger);
db3187ae 1031 if (ret < 0)
8ac2bde2 1032 goto err1;
8ac2bde2 1033
f11d61e7
FW		 1034 ret = nf_log_register(NFPROTO_ARP, &nf_arp_logger);
1035 if (ret < 0)
1036 goto err2;
8ac2bde2 1037
f5466caa
FW		 1038 ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger);
1039 if (ret < 0)
1040 goto err3;
1041
1510618e
FW		 1042 ret = nf_log_register(NFPROTO_NETDEV, &nf_netdev_logger);
1043 if (ret < 0)
1044 goto err4;
1045
77ccee96
FW		 1046 ret = nf_log_register(NFPROTO_BRIDGE, &nf_bridge_logger);
1047 if (ret < 0)
1048 goto err5;
1049
f11d61e7 1050 return 0;
77ccee96
FW		 1051err5:
1052 nf_log_unregister(&nf_netdev_logger);
1510618e
FW		 1053err4:
1054 nf_log_unregister(&nf_ip6_logger);
f5466caa 1055err3:
f11d61e7 1056 nf_log_unregister(&nf_arp_logger);
f5466caa
FW		 1057err2:
1058 nf_log_unregister(&nf_ip_logger);
8ac2bde2 1059err1:
f11d61e7 1060 pr_err("failed to register logger\n");
db3187ae 1061 unregister_pernet_subsys(&nf_log_syslog_net_ops);
8ac2bde2 1062 return ret;
83e96d44
PNA		 1063}
1064
db3187ae 1065static void __exit nf_log_syslog_exit(void)
83e96d44 1066{
db3187ae 1067 unregister_pernet_subsys(&nf_log_syslog_net_ops);
83e96d44 1068 nf_log_unregister(&nf_ip_logger);
f11d61e7 1069 nf_log_unregister(&nf_arp_logger);
f5466caa 1070 nf_log_unregister(&nf_ip6_logger);
1510618e 1071 nf_log_unregister(&nf_netdev_logger);
77ccee96 1072 nf_log_unregister(&nf_bridge_logger);
83e96d44
PNA		 1073}
1074
db3187ae
FW		 1075module_init(nf_log_syslog_init);
1076module_exit(nf_log_syslog_exit);
83e96d44
PNA		 1077
1078MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
db3187ae 1079MODULE_DESCRIPTION("Netfilter syslog packet logging");
83e96d44 1080MODULE_LICENSE("GPL");
f11d61e7 1081MODULE_ALIAS("nf_log_arp");
77ccee96 1082MODULE_ALIAS("nf_log_bridge");
db3187ae 1083MODULE_ALIAS("nf_log_ipv4");
f5466caa 1084MODULE_ALIAS("nf_log_ipv6");
1510618e 1085MODULE_ALIAS("nf_log_netdev");
77ccee96 1086MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 0);
fab4085f 1087MODULE_ALIAS_NF_LOGGER(AF_INET, 0);
f11d61e7 1088MODULE_ALIAS_NF_LOGGER(3, 0);
1510618e 1089MODULE_ALIAS_NF_LOGGER(5, 0); /* NFPROTO_NETDEV */
f5466caa 1090MODULE_ALIAS_NF_LOGGER(AF_INET6, 0);
Linux 6.x block layer and io_uring tree(s)