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Merge tag 'pci-v6.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
[linux-2.6-block.git] / net / core / flow_dissector.c
CommitLineData
457c8996 1// SPDX-License-Identifier: GPL-2.0-only
fbff949e 2#include <linux/kernel.h>
0744dd00 3#include <linux/skbuff.h>
c452ed70 4#include <linux/export.h>
0744dd00
ED		 5#include <linux/ip.h>
6#include <linux/ipv6.h>
7#include <linux/if_vlan.h>
b6459415 8#include <linux/filter.h>
43e66528 9#include <net/dsa.h>
a38402bc 10#include <net/dst_metadata.h>
0744dd00 11#include <net/ip.h>
ddbe5032 12#include <net/ipv6.h>
ab10dccb
GF		 13#include <net/gre.h>
14#include <net/pptp.h>
8d6e79d3 15#include <net/tipc.h>
f77668dc
DB		 16#include <linux/igmp.h>
17#include <linux/icmp.h>
18#include <linux/sctp.h>
19#include <linux/dccp.h>
0744dd00
ED		 20#include <linux/if_tunnel.h>
21#include <linux/if_pppox.h>
22#include <linux/ppp_defs.h>
06635a35 23#include <linux/stddef.h>
67a900cc 24#include <linux/if_ether.h>
bf08824a 25#include <linux/if_hsr.h>
b3baa0fb 26#include <linux/mpls.h>
ac4bb5de 27#include <linux/tcp.h>
4f1cc51f 28#include <linux/ptp_classify.h>
1bd758eb 29#include <net/flow_dissector.h>
d5ccfd90 30#include <net/pkt_cls.h>
56193d1b 31#include <scsi/fc/fc_fcoe.h>
5b0890a9 32#include <uapi/linux/batadv_packet.h>
d58e468b 33#include <linux/bpf.h>
75a56758
PB		 34#if IS_ENABLED(CONFIG_NF_CONNTRACK)
35#include <net/netfilter/nf_conntrack_core.h>
36#include <net/netfilter/nf_conntrack_labels.h>
37#endif
a3fd7cee 38#include <linux/bpf-netns.h>
d58e468b 39
20a17bf6
DM		 40static void dissector_set_key(struct flow_dissector *flow_dissector,
41 enum flow_dissector_key_id key_id)
fbff949e 42{
2b3082c6 43 flow_dissector->used_keys |= (1ULL << key_id);
fbff949e
JP		 44}
45
fbff949e
JP		 46void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
47 const struct flow_dissector_key *key,
48 unsigned int key_count)
49{
50 unsigned int i;
51
52 memset(flow_dissector, 0, sizeof(*flow_dissector));
53
54 for (i = 0; i < key_count; i++, key++) {
75a5fb0c 55 /* User should make sure that every key target offset is within
fbff949e
JP		 56 * boundaries of unsigned short.
57 */
58 BUG_ON(key->offset > USHRT_MAX);
20a17bf6
DM		 59 BUG_ON(dissector_uses_key(flow_dissector,
60 key->key_id));
fbff949e 61
20a17bf6 62 dissector_set_key(flow_dissector, key->key_id);
fbff949e
JP		 63 flow_dissector->offset[key->key_id] = key->offset;
64 }
65
42aecaa9
TH		 66 /* Ensure that the dissector always includes control and basic key.
67 * That way we are able to avoid handling lack of these in fast path.
fbff949e 68 */
20a17bf6
DM		 69 BUG_ON(!dissector_uses_key(flow_dissector,
70 FLOW_DISSECTOR_KEY_CONTROL));
71 BUG_ON(!dissector_uses_key(flow_dissector,
72 FLOW_DISSECTOR_KEY_BASIC));
fbff949e
JP		 73}
74EXPORT_SYMBOL(skb_flow_dissector_init);
75
b27f7bb5 76#ifdef CONFIG_BPF_SYSCALL
3b701699
JS		 77int flow_dissector_bpf_prog_attach_check(struct net *net,
78 struct bpf_prog *prog)
d58e468b 79{
a3fd7cee 80 enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
a11c397c
SF		 81
82 if (net == &init_net) {
83 /* BPF flow dissector in the root namespace overrides
84 * any per-net-namespace one. When attaching to root,
85 * make sure we don't have any BPF program attached
86 * to the non-root namespaces.
87 */
88 struct net *ns;
89
90 for_each_net(ns) {
719b78a5
JS		 91 if (ns == &init_net)
92 continue;
695c1214 93 if (rcu_access_pointer(ns->bpf.run_array[type]))
171526f6 94 return -EEXIST;
a11c397c
SF		 95 }
96 } else {
97 /* Make sure root flow dissector is not attached
98 * when attaching to the non-root namespace.
99 */
695c1214 100 if (rcu_access_pointer(init_net.bpf.run_array[type]))
171526f6 101 return -EEXIST;
a11c397c
SF		 102 }
103
171526f6
JS		 104 return 0;
105}
b27f7bb5 106#endif /* CONFIG_BPF_SYSCALL */
5cf65922 107
357afe9c 108/**
c52fd4f0 109 * skb_flow_get_ports - extract the upper layer ports and return them
6451b3f5 110 * @skb: sk_buff to extract the ports from
357afe9c
NA		 111 * @thoff: transport header offset
112 * @ip_proto: protocol for which to get port offset
6451b3f5
WC		 113 * @data: raw buffer pointer to the packet, if NULL use skb->data
114 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
357afe9c
NA		 115 *
116 * The function will try to retrieve the ports at offset thoff + poff where poff
117 * is the protocol port offset returned from proto_ports_offset
118 */
c52fd4f0
ND		 119__be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
120 const void *data, int hlen)
357afe9c
NA		 121{
122 int poff = proto_ports_offset(ip_proto);
123
690e36e7
DM		 124 if (!data) {
125 data = skb->data;
126 hlen = skb_headlen(skb);
127 }
128
357afe9c
NA		 129 if (poff >= 0) {
130 __be32 *ports, _ports;
131
690e36e7
DM		 132 ports = __skb_header_pointer(skb, thoff + poff,
133 sizeof(_ports), data, hlen, &_ports);
357afe9c
NA		 134 if (ports)
135 return *ports;
136 }
137
138 return 0;
139}
c52fd4f0 140EXPORT_SYMBOL(skb_flow_get_ports);
357afe9c 141
5dec597e
MC		 142static bool icmp_has_id(u8 type)
143{
144 switch (type) {
145 case ICMP_ECHO:
146 case ICMP_ECHOREPLY:
147 case ICMP_TIMESTAMP:
148 case ICMP_TIMESTAMPREPLY:
149 case ICMPV6_ECHO_REQUEST:
150 case ICMPV6_ECHO_REPLY:
151 return true;
152 }
153
154 return false;
155}
156
157/**
158 * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields
159 * @skb: sk_buff to extract from
160 * @key_icmp: struct flow_dissector_key_icmp to fill
161 * @data: raw buffer pointer to the packet
6b3acfc3 162 * @thoff: offset to extract at
5dec597e
MC		 163 * @hlen: packet header length
164 */
165void skb_flow_get_icmp_tci(const struct sk_buff *skb,
166 struct flow_dissector_key_icmp *key_icmp,
f96533cd 167 const void *data, int thoff, int hlen)
5dec597e
MC		 168{
169 struct icmphdr *ih, _ih;
170
171 ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih);
172 if (!ih)
173 return;
174
175 key_icmp->type = ih->type;
176 key_icmp->code = ih->code;
177
178 /* As we use 0 to signal that the Id field is not present,
179 * avoid confusion with packets without such field
180 */
181 if (icmp_has_id(ih->type))
a25f8222 182 key_icmp->id = ih->un.echo.id ? ntohs(ih->un.echo.id) : 1;
5dec597e
MC		 183 else
184 key_icmp->id = 0;
185}
186EXPORT_SYMBOL(skb_flow_get_icmp_tci);
187
188/* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet
189 * using skb_flow_get_icmp_tci().
3b336d6f
MC		 190 */
191static void __skb_flow_dissect_icmp(const struct sk_buff *skb,
192 struct flow_dissector *flow_dissector,
f96533cd
AL		 193 void *target_container, const void *data,
194 int thoff, int hlen)
3b336d6f
MC		 195{
196 struct flow_dissector_key_icmp *key_icmp;
197
198 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP))
199 return;
200
201 key_icmp = skb_flow_dissector_target(flow_dissector,
202 FLOW_DISSECTOR_KEY_ICMP,
203 target_container);
5dec597e
MC		 204
205 skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen);
3b336d6f
MC		 206}
207
a57c34a8
RK		 208static void __skb_flow_dissect_ah(const struct sk_buff *skb,
209 struct flow_dissector *flow_dissector,
210 void *target_container, const void *data,
211 int nhoff, int hlen)
212{
213 struct flow_dissector_key_ipsec *key_ah;
214 struct ip_auth_hdr _hdr, *hdr;
215
216 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPSEC))
217 return;
218
219 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
220 if (!hdr)
221 return;
222
223 key_ah = skb_flow_dissector_target(flow_dissector,
224 FLOW_DISSECTOR_KEY_IPSEC,
225 target_container);
226
227 key_ah->spi = hdr->spi;
228}
229
230static void __skb_flow_dissect_esp(const struct sk_buff *skb,
231 struct flow_dissector *flow_dissector,
232 void *target_container, const void *data,
233 int nhoff, int hlen)
234{
235 struct flow_dissector_key_ipsec *key_esp;
236 struct ip_esp_hdr _hdr, *hdr;
237
238 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPSEC))
239 return;
240
241 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
242 if (!hdr)
243 return;
244
245 key_esp = skb_flow_dissector_target(flow_dissector,
246 FLOW_DISSECTOR_KEY_IPSEC,
247 target_container);
248
249 key_esp->spi = hdr->spi;
250}
251
dda2fa08
WD		 252static void __skb_flow_dissect_l2tpv3(const struct sk_buff *skb,
253 struct flow_dissector *flow_dissector,
254 void *target_container, const void *data,
255 int nhoff, int hlen)
256{
257 struct flow_dissector_key_l2tpv3 *key_l2tpv3;
258 struct {
259 __be32 session_id;
260 } *hdr, _hdr;
261
262 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_L2TPV3))
263 return;
264
265 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
266 if (!hdr)
267 return;
268
269 key_l2tpv3 = skb_flow_dissector_target(flow_dissector,
270 FLOW_DISSECTOR_KEY_L2TPV3,
271 target_container);
272
273 key_l2tpv3->session_id = hdr->session_id;
274}
275
82828b88
JP		 276void skb_flow_dissect_meta(const struct sk_buff *skb,
277 struct flow_dissector *flow_dissector,
278 void *target_container)
279{
280 struct flow_dissector_key_meta *meta;
281
282 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
283 return;
284
285 meta = skb_flow_dissector_target(flow_dissector,
286 FLOW_DISSECTOR_KEY_META,
287 target_container);
288 meta->ingress_ifindex = skb->skb_iif;
d5ccfd90
IS		 289#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
290 if (tc_skb_ext_tc_enabled()) {
291 struct tc_skb_ext *ext;
292
293 ext = skb_ext_find(skb, TC_SKB_EXT);
294 if (ext)
295 meta->l2_miss = ext->l2_miss;
296 }
297#endif
82828b88
JP		 298}
299EXPORT_SYMBOL(skb_flow_dissect_meta);
300
a38402bc 301static void
4d0aed38
AST		 302skb_flow_dissect_set_enc_control(enum flow_dissector_key_id type,
303 u32 ctrl_flags,
304 struct flow_dissector *flow_dissector,
305 void *target_container)
a38402bc
SH		 306{
307 struct flow_dissector_key_control *ctrl;
308
309 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
310 return;
311
312 ctrl = skb_flow_dissector_target(flow_dissector,
313 FLOW_DISSECTOR_KEY_ENC_CONTROL,
314 target_container);
315 ctrl->addr_type = type;
4d0aed38 316 ctrl->flags = ctrl_flags;
a38402bc
SH		 317}
318
75a56758
PB		 319void
320skb_flow_dissect_ct(const struct sk_buff *skb,
321 struct flow_dissector *flow_dissector,
7baf2429 322 void *target_container, u16 *ctinfo_map,
38495958 323 size_t mapsize, bool post_ct, u16 zone)
75a56758
PB		 324{
325#if IS_ENABLED(CONFIG_NF_CONNTRACK)
326 struct flow_dissector_key_ct *key;
327 enum ip_conntrack_info ctinfo;
328 struct nf_conn_labels *cl;
329 struct nf_conn *ct;
330
331 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
332 return;
333
334 ct = nf_ct_get(skb, &ctinfo);
7baf2429 335 if (!ct && !post_ct)
75a56758
PB		 336 return;
337
338 key = skb_flow_dissector_target(flow_dissector,
339 FLOW_DISSECTOR_KEY_CT,
340 target_container);
341
7baf2429 342 if (!ct) {
343 key->ct_state = TCA_FLOWER_KEY_CT_FLAGS_TRACKED |
344 TCA_FLOWER_KEY_CT_FLAGS_INVALID;
38495958 345 key->ct_zone = zone;
7baf2429 346 return;
347 }
348
75a56758
PB		 349 if (ctinfo < mapsize)
350 key->ct_state = ctinfo_map[ctinfo];
351#if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
352 key->ct_zone = ct->zone.id;
353#endif
354#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
52d1aa8b 355 key->ct_mark = READ_ONCE(ct->mark);
75a56758
PB		 356#endif
357
358 cl = nf_ct_labels_find(ct);
359 if (cl)
360 memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
361#endif /* CONFIG_NF_CONNTRACK */
362}
363EXPORT_SYMBOL(skb_flow_dissect_ct);
364
62b32379
SH		 365void
366skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
367 struct flow_dissector *flow_dissector,
368 void *target_container)
a38402bc
SH		 369{
370 struct ip_tunnel_info *info;
371 struct ip_tunnel_key *key;
4d0aed38 372 u32 ctrl_flags = 0;
a38402bc
SH		 373
374 /* A quick check to see if there might be something to do. */
375 if (!dissector_uses_key(flow_dissector,
376 FLOW_DISSECTOR_KEY_ENC_KEYID) &&
377 !dissector_uses_key(flow_dissector,
378 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
379 !dissector_uses_key(flow_dissector,
380 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
381 !dissector_uses_key(flow_dissector,
382 FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
383 !dissector_uses_key(flow_dissector,
5544adb9
OG		 384 FLOW_DISSECTOR_KEY_ENC_PORTS) &&
385 !dissector_uses_key(flow_dissector,
92e2c405
SH		 386 FLOW_DISSECTOR_KEY_ENC_IP) &&
387 !dissector_uses_key(flow_dissector,
db5271d5 388 FLOW_DISSECTOR_KEY_ENC_OPTS))
a38402bc
SH		 389 return;
390
391 info = skb_tunnel_info(skb);
392 if (!info)
393 return;
394
395 key = &info->key;
396
03afeb61
AST		 397 if (test_bit(IP_TUNNEL_CSUM_BIT, key->tun_flags))
398 ctrl_flags |= FLOW_DIS_F_TUNNEL_CSUM;
399 if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags))
400 ctrl_flags |= FLOW_DIS_F_TUNNEL_DONT_FRAGMENT;
401 if (test_bit(IP_TUNNEL_OAM_BIT, key->tun_flags))
402 ctrl_flags |= FLOW_DIS_F_TUNNEL_OAM;
403 if (test_bit(IP_TUNNEL_CRIT_OPT_BIT, key->tun_flags))
404 ctrl_flags |= FLOW_DIS_F_TUNNEL_CRIT_OPT;
405
a38402bc
SH		 406 switch (ip_tunnel_info_af(info)) {
407 case AF_INET:
4d0aed38
AST		 408 skb_flow_dissect_set_enc_control(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
409 ctrl_flags, flow_dissector,
410 target_container);
a38402bc
SH		 411 if (dissector_uses_key(flow_dissector,
412 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
413 struct flow_dissector_key_ipv4_addrs *ipv4;
414
415 ipv4 = skb_flow_dissector_target(flow_dissector,
416 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
417 target_container);
418 ipv4->src = key->u.ipv4.src;
419 ipv4->dst = key->u.ipv4.dst;
420 }
421 break;
422 case AF_INET6:
4d0aed38
AST		 423 skb_flow_dissect_set_enc_control(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
424 ctrl_flags, flow_dissector,
425 target_container);
a38402bc
SH		 426 if (dissector_uses_key(flow_dissector,
427 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
428 struct flow_dissector_key_ipv6_addrs *ipv6;
429
430 ipv6 = skb_flow_dissector_target(flow_dissector,
431 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
432 target_container);
433 ipv6->src = key->u.ipv6.src;
434 ipv6->dst = key->u.ipv6.dst;
435 }
436 break;
706bf4f4
AST		 437 default:
438 skb_flow_dissect_set_enc_control(0, ctrl_flags, flow_dissector,
439 target_container);
440 break;
a38402bc
SH		 441 }
442
443 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
444 struct flow_dissector_key_keyid *keyid;
445
446 keyid = skb_flow_dissector_target(flow_dissector,
447 FLOW_DISSECTOR_KEY_ENC_KEYID,
448 target_container);
449 keyid->keyid = tunnel_id_to_key32(key->tun_id);
450 }
451
452 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
453 struct flow_dissector_key_ports *tp;
454
455 tp = skb_flow_dissector_target(flow_dissector,
456 FLOW_DISSECTOR_KEY_ENC_PORTS,
457 target_container);
458 tp->src = key->tp_src;
459 tp->dst = key->tp_dst;
460 }
5544adb9
OG		 461
462 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
463 struct flow_dissector_key_ip *ip;
464
465 ip = skb_flow_dissector_target(flow_dissector,
466 FLOW_DISSECTOR_KEY_ENC_IP,
467 target_container);
468 ip->tos = key->tos;
469 ip->ttl = key->ttl;
470 }
92e2c405
SH		 471
472 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
473 struct flow_dissector_key_enc_opts *enc_opt;
5832c4a7
AL		 474 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
475 u32 val;
92e2c405
SH		 476
477 enc_opt = skb_flow_dissector_target(flow_dissector,
478 FLOW_DISSECTOR_KEY_ENC_OPTS,
479 target_container);
480
5832c4a7
AL		 481 if (!info->options_len)
482 return;
483
484 enc_opt->len = info->options_len;
485 ip_tunnel_info_opts_get(enc_opt->data, info);
486
487 ip_tunnel_set_options_present(flags);
488 ip_tunnel_flags_and(flags, info->key.tun_flags, flags);
489
490 val = find_next_bit(flags, __IP_TUNNEL_FLAG_NUM,
491 IP_TUNNEL_GENEVE_OPT_BIT);
492 enc_opt->dst_opt_type = val < __IP_TUNNEL_FLAG_NUM ? val : 0;
92e2c405 493 }
a38402bc 494}
62b32379 495EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
a38402bc 496
0cb09aff
AL		 497void skb_flow_dissect_hash(const struct sk_buff *skb,
498 struct flow_dissector *flow_dissector,
499 void *target_container)
500{
501 struct flow_dissector_key_hash *key;
502
503 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_HASH))
504 return;
505
506 key = skb_flow_dissector_target(flow_dissector,
507 FLOW_DISSECTOR_KEY_HASH,
508 target_container);
509
510 key->hash = skb_get_hash_raw(skb);
511}
512EXPORT_SYMBOL(skb_flow_dissect_hash);
513
4a5d6c8b
JP		 514static enum flow_dissect_ret
515__skb_flow_dissect_mpls(const struct sk_buff *skb,
516 struct flow_dissector *flow_dissector,
f96533cd
AL		 517 void *target_container, const void *data, int nhoff,
518 int hlen, int lse_index, bool *entropy_label)
4a5d6c8b 519{
58cff782
GN		 520 struct mpls_label *hdr, _hdr;
521 u32 entry, label, bos;
4a5d6c8b
JP		 522
523 if (!dissector_uses_key(flow_dissector,
029c1ecb
BL		 524 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
525 !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
4a5d6c8b
JP		 526 return FLOW_DISSECT_RET_OUT_GOOD;
527
58cff782
GN		 528 if (lse_index >= FLOW_DIS_MPLS_MAX)
529 return FLOW_DISSECT_RET_OUT_GOOD;
530
4a5d6c8b
JP		 531 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
532 hlen, &_hdr);
533 if (!hdr)
534 return FLOW_DISSECT_RET_OUT_BAD;
535
58cff782 536 entry = ntohl(hdr->entry);
029c1ecb 537 label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
58cff782 538 bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
029c1ecb
BL		 539
540 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
541 struct flow_dissector_key_mpls *key_mpls;
58cff782 542 struct flow_dissector_mpls_lse *lse;
029c1ecb
BL		 543
544 key_mpls = skb_flow_dissector_target(flow_dissector,
545 FLOW_DISSECTOR_KEY_MPLS,
546 target_container);
58cff782
GN		 547 lse = &key_mpls->ls[lse_index];
548
549 lse->mpls_ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
550 lse->mpls_bos = bos;
551 lse->mpls_tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
552 lse->mpls_label = label;
553 dissector_set_mpls_lse(key_mpls, lse_index);
029c1ecb
BL		 554 }
555
58cff782
GN		 556 if (*entropy_label &&
557 dissector_uses_key(flow_dissector,
558 FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
559 struct flow_dissector_key_keyid *key_keyid;
560
4a5d6c8b
JP		 561 key_keyid = skb_flow_dissector_target(flow_dissector,
562 FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
563 target_container);
58cff782 564 key_keyid->keyid = cpu_to_be32(label);
4a5d6c8b 565 }
58cff782
GN		 566
567 *entropy_label = label == MPLS_LABEL_ENTROPY;
568
569 return bos ? FLOW_DISSECT_RET_OUT_GOOD : FLOW_DISSECT_RET_PROTO_AGAIN;
4a5d6c8b
JP		 570}
571
9bf881ff
JP		 572static enum flow_dissect_ret
573__skb_flow_dissect_arp(const struct sk_buff *skb,
574 struct flow_dissector *flow_dissector,
f96533cd
AL		 575 void *target_container, const void *data,
576 int nhoff, int hlen)
9bf881ff
JP		 577{
578 struct flow_dissector_key_arp *key_arp;
579 struct {
580 unsigned char ar_sha[ETH_ALEN];
581 unsigned char ar_sip[4];
582 unsigned char ar_tha[ETH_ALEN];
583 unsigned char ar_tip[4];
584 } *arp_eth, _arp_eth;
585 const struct arphdr *arp;
6f14f443 586 struct arphdr _arp;
9bf881ff
JP		 587
588 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
589 return FLOW_DISSECT_RET_OUT_GOOD;
590
591 arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
592 hlen, &_arp);
593 if (!arp)
594 return FLOW_DISSECT_RET_OUT_BAD;
595
596 if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
597 arp->ar_pro != htons(ETH_P_IP) ||
598 arp->ar_hln != ETH_ALEN ||
599 arp->ar_pln != 4 ||
600 (arp->ar_op != htons(ARPOP_REPLY) &&
601 arp->ar_op != htons(ARPOP_REQUEST)))
602 return FLOW_DISSECT_RET_OUT_BAD;
603
604 arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
605 sizeof(_arp_eth), data,
606 hlen, &_arp_eth);
607 if (!arp_eth)
608 return FLOW_DISSECT_RET_OUT_BAD;
609
610 key_arp = skb_flow_dissector_target(flow_dissector,
611 FLOW_DISSECTOR_KEY_ARP,
612 target_container);
613
614 memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
615 memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
616
617 /* Only store the lower byte of the opcode;
618 * this covers ARPOP_REPLY and ARPOP_REQUEST.
619 */
620 key_arp->op = ntohs(arp->ar_op) & 0xff;
621
622 ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
623 ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
624
625 return FLOW_DISSECT_RET_OUT_GOOD;
626}
627
d7ad70b5
ZD		 628static enum flow_dissect_ret
629__skb_flow_dissect_cfm(const struct sk_buff *skb,
630 struct flow_dissector *flow_dissector,
631 void *target_container, const void *data,
632 int nhoff, int hlen)
633{
634 struct flow_dissector_key_cfm *key, *hdr, _hdr;
635
636 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CFM))
637 return FLOW_DISSECT_RET_OUT_GOOD;
638
639 hdr = __skb_header_pointer(skb, nhoff, sizeof(*key), data, hlen, &_hdr);
640 if (!hdr)
641 return FLOW_DISSECT_RET_OUT_BAD;
642
643 key = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_CFM,
644 target_container);
645
646 key->mdl_ver = hdr->mdl_ver;
647 key->opcode = hdr->opcode;
648
649 return FLOW_DISSECT_RET_OUT_GOOD;
650}
651
7c92de8e
JP		 652static enum flow_dissect_ret
653__skb_flow_dissect_gre(const struct sk_buff *skb,
654 struct flow_dissector_key_control *key_control,
655 struct flow_dissector *flow_dissector,
f96533cd 656 void *target_container, const void *data,
7c92de8e
JP		 657 __be16 *p_proto, int *p_nhoff, int *p_hlen,
658 unsigned int flags)
659{
660 struct flow_dissector_key_keyid *key_keyid;
661 struct gre_base_hdr *hdr, _hdr;
662 int offset = 0;
663 u16 gre_ver;
664
665 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
666 data, *p_hlen, &_hdr);
667 if (!hdr)
668 return FLOW_DISSECT_RET_OUT_BAD;
669
670 /* Only look inside GRE without routing */
671 if (hdr->flags & GRE_ROUTING)
672 return FLOW_DISSECT_RET_OUT_GOOD;
673
674 /* Only look inside GRE for version 0 and 1 */
675 gre_ver = ntohs(hdr->flags & GRE_VERSION);
676 if (gre_ver > 1)
677 return FLOW_DISSECT_RET_OUT_GOOD;
678
679 *p_proto = hdr->protocol;
680 if (gre_ver) {
681 /* Version1 must be PPTP, and check the flags */
682 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
683 return FLOW_DISSECT_RET_OUT_GOOD;
684 }
685
686 offset += sizeof(struct gre_base_hdr);
687
688 if (hdr->flags & GRE_CSUM)
c593642c
PB		 689 offset += sizeof_field(struct gre_full_hdr, csum) +
690 sizeof_field(struct gre_full_hdr, reserved1);
7c92de8e
JP		 691
692 if (hdr->flags & GRE_KEY) {
693 const __be32 *keyid;
694 __be32 _keyid;
695
696 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
697 sizeof(_keyid),
698 data, *p_hlen, &_keyid);
699 if (!keyid)
700 return FLOW_DISSECT_RET_OUT_BAD;
701
702 if (dissector_uses_key(flow_dissector,
703 FLOW_DISSECTOR_KEY_GRE_KEYID)) {
704 key_keyid = skb_flow_dissector_target(flow_dissector,
705 FLOW_DISSECTOR_KEY_GRE_KEYID,
706 target_container);
707 if (gre_ver == 0)
708 key_keyid->keyid = *keyid;
709 else
710 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
711 }
c593642c 712 offset += sizeof_field(struct gre_full_hdr, key);
7c92de8e
JP		 713 }
714
715 if (hdr->flags & GRE_SEQ)
c593642c 716 offset += sizeof_field(struct pptp_gre_header, seq);
7c92de8e
JP		 717
718 if (gre_ver == 0) {
719 if (*p_proto == htons(ETH_P_TEB)) {
720 const struct ethhdr *eth;
721 struct ethhdr _eth;
722
723 eth = __skb_header_pointer(skb, *p_nhoff + offset,
724 sizeof(_eth),
725 data, *p_hlen, &_eth);
726 if (!eth)
727 return FLOW_DISSECT_RET_OUT_BAD;
728 *p_proto = eth->h_proto;
729 offset += sizeof(*eth);
730
731 /* Cap headers that we access via pointers at the
732 * end of the Ethernet header as our maximum alignment
733 * at that point is only 2 bytes.
734 */
735 if (NET_IP_ALIGN)
736 *p_hlen = *p_nhoff + offset;
737 }
738 } else { /* version 1, must be PPTP */
739 u8 _ppp_hdr[PPP_HDRLEN];
740 u8 *ppp_hdr;
741
742 if (hdr->flags & GRE_ACK)
c593642c 743 offset += sizeof_field(struct pptp_gre_header, ack);
7c92de8e
JP		 744
745 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
746 sizeof(_ppp_hdr),
747 data, *p_hlen, _ppp_hdr);
748 if (!ppp_hdr)
749 return FLOW_DISSECT_RET_OUT_BAD;
750
751 switch (PPP_PROTOCOL(ppp_hdr)) {
752 case PPP_IP:
753 *p_proto = htons(ETH_P_IP);
754 break;
755 case PPP_IPV6:
756 *p_proto = htons(ETH_P_IPV6);
757 break;
758 default:
759 /* Could probably catch some more like MPLS */
760 break;
761 }
762
763 offset += PPP_HDRLEN;
764 }
765
766 *p_nhoff += offset;
767 key_control->flags |= FLOW_DIS_ENCAPSULATION;
768 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
769 return FLOW_DISSECT_RET_OUT_GOOD;
770
3a1214e8 771 return FLOW_DISSECT_RET_PROTO_AGAIN;
7c92de8e
JP		 772}
773
5b0890a9
SE		 774/**
775 * __skb_flow_dissect_batadv() - dissect batman-adv header
776 * @skb: sk_buff to with the batman-adv header
777 * @key_control: flow dissectors control key
778 * @data: raw buffer pointer to the packet, if NULL use skb->data
779 * @p_proto: pointer used to update the protocol to process next
780 * @p_nhoff: pointer used to update inner network header offset
781 * @hlen: packet header length
782 * @flags: any combination of FLOW_DISSECTOR_F_*
783 *
784 * ETH_P_BATMAN packets are tried to be dissected. Only
785 * &struct batadv_unicast packets are actually processed because they contain an
786 * inner ethernet header and are usually followed by actual network header. This
787 * allows the flow dissector to continue processing the packet.
788 *
789 * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
790 * FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
791 * otherwise FLOW_DISSECT_RET_OUT_BAD
792 */
793static enum flow_dissect_ret
794__skb_flow_dissect_batadv(const struct sk_buff *skb,
795 struct flow_dissector_key_control *key_control,
f96533cd
AL		 796 const void *data, __be16 *p_proto, int *p_nhoff,
797 int hlen, unsigned int flags)
5b0890a9
SE		 798{
799 struct {
800 struct batadv_unicast_packet batadv_unicast;
801 struct ethhdr eth;
802 } *hdr, _hdr;
803
804 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
805 &_hdr);
806 if (!hdr)
807 return FLOW_DISSECT_RET_OUT_BAD;
808
809 if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
810 return FLOW_DISSECT_RET_OUT_BAD;
811
812 if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
813 return FLOW_DISSECT_RET_OUT_BAD;
814
815 *p_proto = hdr->eth.h_proto;
816 *p_nhoff += sizeof(*hdr);
817
818 key_control->flags |= FLOW_DIS_ENCAPSULATION;
819 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
820 return FLOW_DISSECT_RET_OUT_GOOD;
821
822 return FLOW_DISSECT_RET_PROTO_AGAIN;
823}
824
ac4bb5de
JP		 825static void
826__skb_flow_dissect_tcp(const struct sk_buff *skb,
827 struct flow_dissector *flow_dissector,
f96533cd
AL		 828 void *target_container, const void *data,
829 int thoff, int hlen)
ac4bb5de
JP		 830{
831 struct flow_dissector_key_tcp *key_tcp;
832 struct tcphdr *th, _th;
833
834 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
835 return;
836
837 th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
838 if (!th)
839 return;
840
841 if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
842 return;
843
844 key_tcp = skb_flow_dissector_target(flow_dissector,
845 FLOW_DISSECTOR_KEY_TCP,
846 target_container);
847 key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
848}
849
8ffb055b
YK		 850static void
851__skb_flow_dissect_ports(const struct sk_buff *skb,
852 struct flow_dissector *flow_dissector,
f96533cd
AL		 853 void *target_container, const void *data,
854 int nhoff, u8 ip_proto, int hlen)
8ffb055b 855{
3e579686
CW		 856 struct flow_dissector_key_ports_range *key_ports_range = NULL;
857 struct flow_dissector_key_ports *key_ports = NULL;
858 __be32 ports;
8ffb055b
YK		 859
860 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
3e579686
CW		 861 key_ports = skb_flow_dissector_target(flow_dissector,
862 FLOW_DISSECTOR_KEY_PORTS,
863 target_container);
864
865 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS_RANGE))
866 key_ports_range = skb_flow_dissector_target(flow_dissector,
867 FLOW_DISSECTOR_KEY_PORTS_RANGE,
868 target_container);
8ffb055b 869
3e579686 870 if (!key_ports && !key_ports_range)
8ffb055b
YK		 871 return;
872
c52fd4f0 873 ports = skb_flow_get_ports(skb, nhoff, ip_proto, data, hlen);
3e579686
CW		 874
875 if (key_ports)
876 key_ports->ports = ports;
877
878 if (key_ports_range)
879 key_ports_range->tp.ports = ports;
8ffb055b
YK		 880}
881
518d8a2e
OG		 882static void
883__skb_flow_dissect_ipv4(const struct sk_buff *skb,
884 struct flow_dissector *flow_dissector,
f96533cd
AL		 885 void *target_container, const void *data,
886 const struct iphdr *iph)
518d8a2e
OG		 887{
888 struct flow_dissector_key_ip *key_ip;
889
890 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
891 return;
892
893 key_ip = skb_flow_dissector_target(flow_dissector,
894 FLOW_DISSECTOR_KEY_IP,
895 target_container);
896 key_ip->tos = iph->tos;
897 key_ip->ttl = iph->ttl;
898}
899
900static void
901__skb_flow_dissect_ipv6(const struct sk_buff *skb,
902 struct flow_dissector *flow_dissector,
f96533cd
AL		 903 void *target_container, const void *data,
904 const struct ipv6hdr *iph)
518d8a2e
OG		 905{
906 struct flow_dissector_key_ip *key_ip;
907
908 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
909 return;
910
911 key_ip = skb_flow_dissector_target(flow_dissector,
912 FLOW_DISSECTOR_KEY_IP,
913 target_container);
914 key_ip->tos = ipv6_get_dsfield(iph);
915 key_ip->ttl = iph->hop_limit;
916}
917
1eed4dfb
TH		 918/* Maximum number of protocol headers that can be parsed in
919 * __skb_flow_dissect
920 */
921#define MAX_FLOW_DISSECT_HDRS 15
922
923static bool skb_flow_dissect_allowed(int *num_hdrs)
924{
925 ++*num_hdrs;
926
927 return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
928}
929
d58e468b
PP		 930static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
931 struct flow_dissector *flow_dissector,
932 void *target_container)
933{
69ab34f7 934 struct flow_dissector_key_ports_range *key_ports_range = NULL;
59fb9b62 935 struct flow_dissector_key_ports *key_ports = NULL;
d58e468b
PP		 936 struct flow_dissector_key_control *key_control;
937 struct flow_dissector_key_basic *key_basic;
938 struct flow_dissector_key_addrs *key_addrs;
71c99e32 939 struct flow_dissector_key_tags *key_tags;
d58e468b
PP		 940
941 key_control = skb_flow_dissector_target(flow_dissector,
942 FLOW_DISSECTOR_KEY_CONTROL,
943 target_container);
944 key_control->thoff = flow_keys->thoff;
945 if (flow_keys->is_frag)
946 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
947 if (flow_keys->is_first_frag)
948 key_control->flags |= FLOW_DIS_FIRST_FRAG;
949 if (flow_keys->is_encap)
950 key_control->flags |= FLOW_DIS_ENCAPSULATION;
951
952 key_basic = skb_flow_dissector_target(flow_dissector,
953 FLOW_DISSECTOR_KEY_BASIC,
954 target_container);
955 key_basic->n_proto = flow_keys->n_proto;
956 key_basic->ip_proto = flow_keys->ip_proto;
957
958 if (flow_keys->addr_proto == ETH_P_IP &&
959 dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
960 key_addrs = skb_flow_dissector_target(flow_dissector,
961 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
962 target_container);
963 key_addrs->v4addrs.src = flow_keys->ipv4_src;
964 key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
965 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
966 } else if (flow_keys->addr_proto == ETH_P_IPV6 &&
967 dissector_uses_key(flow_dissector,
968 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
969 key_addrs = skb_flow_dissector_target(flow_dissector,
970 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
971 target_container);
1e3d976d
GS		 972 memcpy(&key_addrs->v6addrs.src, &flow_keys->ipv6_src,
973 sizeof(key_addrs->v6addrs.src));
974 memcpy(&key_addrs->v6addrs.dst, &flow_keys->ipv6_dst,
975 sizeof(key_addrs->v6addrs.dst));
d58e468b
PP		 976 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
977 }
978
69ab34f7 979 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS)) {
d58e468b
PP		 980 key_ports = skb_flow_dissector_target(flow_dissector,
981 FLOW_DISSECTOR_KEY_PORTS,
982 target_container);
983 key_ports->src = flow_keys->sport;
984 key_ports->dst = flow_keys->dport;
985 }
69ab34f7
CW		 986 if (dissector_uses_key(flow_dissector,
987 FLOW_DISSECTOR_KEY_PORTS_RANGE)) {
988 key_ports_range = skb_flow_dissector_target(flow_dissector,
989 FLOW_DISSECTOR_KEY_PORTS_RANGE,
990 target_container);
991 key_ports_range->tp.src = flow_keys->sport;
992 key_ports_range->tp.dst = flow_keys->dport;
993 }
71c99e32
SF		 994
995 if (dissector_uses_key(flow_dissector,
996 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
997 key_tags = skb_flow_dissector_target(flow_dissector,
998 FLOW_DISSECTOR_KEY_FLOW_LABEL,
999 target_container);
1000 key_tags->flow_label = ntohl(flow_keys->flow_label);
1001 }
d58e468b
PP		 1002}
1003
0ba98502
SL		 1004u32 bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
1005 __be16 proto, int nhoff, int hlen, unsigned int flags)
089b19a9
SF		 1006{
1007 struct bpf_flow_keys *flow_keys = ctx->flow_keys;
1008 u32 result;
c8aa7038
SF		 1009
1010 /* Pass parameters to the BPF program */
1011 memset(flow_keys, 0, sizeof(*flow_keys));
089b19a9
SF		 1012 flow_keys->n_proto = proto;
1013 flow_keys->nhoff = nhoff;
c8aa7038
SF		 1014 flow_keys->thoff = flow_keys->nhoff;
1015
086f9568
SF		 1016 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
1017 (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
1018 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
1019 (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1020 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
1021 (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
1022 flow_keys->flags = flags;
1023
3d9f773c 1024 result = bpf_prog_run_pin_on_cpu(prog, ctx);
c8aa7038 1025
089b19a9 1026 flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
c8aa7038 1027 flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
089b19a9 1028 flow_keys->nhoff, hlen);
c8aa7038 1029
0ba98502 1030 return result;
c8aa7038
SF		 1031}
1032
f86d1fbb 1033static bool is_pppoe_ses_hdr_valid(const struct pppoe_hdr *hdr)
46126db9 1034{
f86d1fbb 1035 return hdr->ver == 1 && hdr->type == 1 && hdr->code == 0;
46126db9
WD		 1036}
1037
453a940e
WC		 1038/**
1039 * __skb_flow_dissect - extract the flow_keys struct and return it
3cbf4ffb 1040 * @net: associated network namespace, derived from @skb if NULL
453a940e 1041 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
06635a35
JP		 1042 * @flow_dissector: list of keys to dissect
1043 * @target_container: target structure to put dissected values into
453a940e
WC		 1044 * @data: raw buffer pointer to the packet, if NULL use skb->data
1045 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
1046 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
1047 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
d79b3baf 1048 * @flags: flags that control the dissection process, e.g.
1cc26450 1049 * FLOW_DISSECTOR_F_STOP_AT_ENCAP.
453a940e 1050 *
06635a35
JP		 1051 * The function will try to retrieve individual keys into target specified
1052 * by flow_dissector from either the skbuff or a raw buffer specified by the
1053 * rest parameters.
1054 *
1055 * Caller must take care of zeroing target container memory.
453a940e 1056 */
3cbf4ffb
SF		 1057bool __skb_flow_dissect(const struct net *net,
1058 const struct sk_buff *skb,
06635a35 1059 struct flow_dissector *flow_dissector,
f96533cd
AL		 1060 void *target_container, const void *data,
1061 __be16 proto, int nhoff, int hlen, unsigned int flags)
0744dd00 1062{
42aecaa9 1063 struct flow_dissector_key_control *key_control;
06635a35
JP		 1064 struct flow_dissector_key_basic *key_basic;
1065 struct flow_dissector_key_addrs *key_addrs;
d34af823 1066 struct flow_dissector_key_tags *key_tags;
f6a66927 1067 struct flow_dissector_key_vlan *key_vlan;
3a1214e8 1068 enum flow_dissect_ret fdret;
24c590e3 1069 enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
58cff782
GN		 1070 bool mpls_el = false;
1071 int mpls_lse = 0;
1eed4dfb 1072 int num_hdrs = 0;
8e690ffd 1073 u8 ip_proto = 0;
34fad54c 1074 bool ret;
0744dd00 1075
690e36e7
DM		 1076 if (!data) {
1077 data = skb->data;
d5709f7a
HHZ		 1078 proto = skb_vlan_tag_present(skb) ?
1079 skb->vlan_proto : skb->protocol;
453a940e 1080 nhoff = skb_network_offset(skb);
690e36e7 1081 hlen = skb_headlen(skb);
2d571645 1082#if IS_ENABLED(CONFIG_NET_DSA)
8bef0af0
AL		 1083 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
1084 proto == htons(ETH_P_XDSA))) {
570d0a58 1085 struct metadata_dst *md_dst = skb_metadata_dst(skb);
43e66528 1086 const struct dsa_device_ops *ops;
8bef0af0 1087 int offset = 0;
43e66528
JC		 1088
1089 ops = skb->dev->dsa_ptr->tag_ops;
ec133572 1090 /* Only DSA header taggers break flow dissection */
570d0a58
FF		 1091 if (ops->needed_headroom &&
1092 (!md_dst || md_dst->type != METADATA_HW_PORT_MUX)) {
54fec335
VO		 1093 if (ops->flow_dissect)
1094 ops->flow_dissect(skb, &proto, &offset);
1095 else
1096 dsa_tag_generic_flow_dissect(skb,
1097 &proto,
1098 &offset);
43e66528
JC		 1099 hlen -= offset;
1100 nhoff += offset;
1101 }
1102 }
2d571645 1103#endif
690e36e7
DM		 1104 }
1105
42aecaa9
TH		 1106 /* It is ensured by skb_flow_dissector_init() that control key will
1107 * be always present.
1108 */
1109 key_control = skb_flow_dissector_target(flow_dissector,
1110 FLOW_DISSECTOR_KEY_CONTROL,
1111 target_container);
1112
06635a35
JP		 1113 /* It is ensured by skb_flow_dissector_init() that basic key will
1114 * be always present.
1115 */
1116 key_basic = skb_flow_dissector_target(flow_dissector,
1117 FLOW_DISSECTOR_KEY_BASIC,
1118 target_container);
0744dd00 1119
afec62cd
ED		 1120 rcu_read_lock();
1121
d0e13a14 1122 if (skb) {
3cbf4ffb
SF		 1123 if (!net) {
1124 if (skb->dev)
afec62cd 1125 net = dev_net_rcu(skb->dev);
3cbf4ffb
SF		 1126 else if (skb->sk)
1127 net = sock_net(skb->sk);
3cbf4ffb 1128 }
9b52e3f2 1129 }
c8aa7038 1130
120f1c85 1131 DEBUG_NET_WARN_ON_ONCE(!net);
9b52e3f2 1132 if (net) {
a3fd7cee 1133 enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
695c1214 1134 struct bpf_prog_array *run_array;
a3fd7cee 1135
695c1214
JS		 1136 run_array = rcu_dereference(init_net.bpf.run_array[type]);
1137 if (!run_array)
1138 run_array = rcu_dereference(net->bpf.run_array[type]);
a11c397c 1139
695c1214 1140 if (run_array) {
9b52e3f2
SF		 1141 struct bpf_flow_keys flow_keys;
1142 struct bpf_flow_dissector ctx = {
1143 .flow_keys = &flow_keys,
1144 .data = data,
1145 .data_end = data + hlen,
1146 };
1147 __be16 n_proto = proto;
695c1214 1148 struct bpf_prog *prog;
0ba98502 1149 u32 result;
9b52e3f2
SF		 1150
1151 if (skb) {
1152 ctx.skb = skb;
1153 /* we can't use 'proto' in the skb case
1154 * because it might be set to skb->vlan_proto
1155 * which has been pulled from the data
1156 */
1157 n_proto = skb->protocol;
1158 }
1159
695c1214 1160 prog = READ_ONCE(run_array->items[0].prog);
0ba98502
SL		 1161 result = bpf_flow_dissect(prog, &ctx, n_proto, nhoff,
1162 hlen, flags);
afec62cd
ED		 1163 if (result != BPF_FLOW_DISSECTOR_CONTINUE) {
1164 __skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1165 target_container);
1166 rcu_read_unlock();
1167 return result == BPF_OK;
1168 }
c8aa7038 1169 }
d58e468b 1170 }
d58e468b 1171
afec62cd
ED		 1172 rcu_read_unlock();
1173
20a17bf6
DM		 1174 if (dissector_uses_key(flow_dissector,
1175 FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
67a900cc
JP		 1176 struct ethhdr *eth = eth_hdr(skb);
1177 struct flow_dissector_key_eth_addrs *key_eth_addrs;
1178
1179 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1180 FLOW_DISSECTOR_KEY_ETH_ADDRS,
1181 target_container);
1b808993 1182 memcpy(key_eth_addrs, eth, sizeof(*key_eth_addrs));
67a900cc
JP		 1183 }
1184
34951fcf
BS		 1185 if (dissector_uses_key(flow_dissector,
1186 FLOW_DISSECTOR_KEY_NUM_OF_VLANS)) {
1187 struct flow_dissector_key_num_of_vlans *key_num_of_vlans;
1188
1189 key_num_of_vlans = skb_flow_dissector_target(flow_dissector,
1190 FLOW_DISSECTOR_KEY_NUM_OF_VLANS,
1191 target_container);
1192 key_num_of_vlans->num_of_vlans = 0;
1193 }
1194
c5ef188e 1195proto_again:
3a1214e8
TH		 1196 fdret = FLOW_DISSECT_RET_CONTINUE;
1197
0744dd00 1198 switch (proto) {
2b8837ae 1199 case htons(ETH_P_IP): {
0744dd00
ED		 1200 const struct iphdr *iph;
1201 struct iphdr _iph;
3a1214e8 1202
690e36e7 1203 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
3a1214e8
TH		 1204 if (!iph || iph->ihl < 5) {
1205 fdret = FLOW_DISSECT_RET_OUT_BAD;
1206 break;
1207 }
1208
3797d3e8 1209 nhoff += iph->ihl * 4;
0744dd00 1210
3797d3e8 1211 ip_proto = iph->protocol;
3797d3e8 1212
918c023f
AD		 1213 if (dissector_uses_key(flow_dissector,
1214 FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1215 key_addrs = skb_flow_dissector_target(flow_dissector,
1216 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1217 target_container);
1218
323e0cb4
GS		 1219 memcpy(&key_addrs->v4addrs.src, &iph->saddr,
1220 sizeof(key_addrs->v4addrs.src));
1221 memcpy(&key_addrs->v4addrs.dst, &iph->daddr,
1222 sizeof(key_addrs->v4addrs.dst));
918c023f
AD		 1223 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1224 }
807e165d 1225
d2126838
DC		 1226 __skb_flow_dissect_ipv4(skb, flow_dissector,
1227 target_container, data, iph);
1228
807e165d 1229 if (ip_is_fragment(iph)) {
4b36993d 1230 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
807e165d
TH		 1231
1232 if (iph->frag_off & htons(IP_OFFSET)) {
3a1214e8
TH		 1233 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1234 break;
807e165d 1235 } else {
4b36993d 1236 key_control->flags |= FLOW_DIS_FIRST_FRAG;
3a1214e8
TH		 1237 if (!(flags &
1238 FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1239 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1240 break;
1241 }
807e165d
TH		 1242 }
1243 }
1244
0744dd00
ED		 1245 break;
1246 }
2b8837ae 1247 case htons(ETH_P_IPV6): {
0744dd00
ED		 1248 const struct ipv6hdr *iph;
1249 struct ipv6hdr _iph;
19469a87 1250
690e36e7 1251 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
3a1214e8
TH		 1252 if (!iph) {
1253 fdret = FLOW_DISSECT_RET_OUT_BAD;
1254 break;
1255 }
0744dd00
ED		 1256
1257 ip_proto = iph->nexthdr;
0744dd00 1258 nhoff += sizeof(struct ipv6hdr);
19469a87 1259
20a17bf6
DM		 1260 if (dissector_uses_key(flow_dissector,
1261 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
b3c3106c
AD		 1262 key_addrs = skb_flow_dissector_target(flow_dissector,
1263 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1264 target_container);
5af7fb6e 1265
323e0cb4
GS		 1266 memcpy(&key_addrs->v6addrs.src, &iph->saddr,
1267 sizeof(key_addrs->v6addrs.src));
1268 memcpy(&key_addrs->v6addrs.dst, &iph->daddr,
1269 sizeof(key_addrs->v6addrs.dst));
c3f83241 1270 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
b924933c 1271 }
87ee9e52 1272
461547f3
AD		 1273 if ((dissector_uses_key(flow_dissector,
1274 FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1275 (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1276 ip6_flowlabel(iph)) {
1277 __be32 flow_label = ip6_flowlabel(iph);
1278
20a17bf6
DM		 1279 if (dissector_uses_key(flow_dissector,
1280 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
87ee9e52
TH		 1281 key_tags = skb_flow_dissector_target(flow_dissector,
1282 FLOW_DISSECTOR_KEY_FLOW_LABEL,
1283 target_container);
1284 key_tags->flow_label = ntohl(flow_label);
12c227ec 1285 }
3a1214e8
TH		 1286 if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1287 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1288 break;
1289 }
19469a87
TH		 1290 }
1291
518d8a2e
OG		 1292 __skb_flow_dissect_ipv6(skb, flow_dissector,
1293 target_container, data, iph);
1294
0744dd00
ED		 1295 break;
1296 }
2b8837ae
JP		 1297 case htons(ETH_P_8021AD):
1298 case htons(ETH_P_8021Q): {
24c590e3 1299 const struct vlan_hdr *vlan = NULL;
bc72f3dd 1300 struct vlan_hdr _vlan;
2064c3d4 1301 __be16 saved_vlan_tpid = proto;
0744dd00 1302
24c590e3
JL		 1303 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1304 skb && skb_vlan_tag_present(skb)) {
d5709f7a 1305 proto = skb->protocol;
24c590e3 1306 } else {
d5709f7a
HHZ		 1307 vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1308 data, hlen, &_vlan);
3a1214e8
TH		 1309 if (!vlan) {
1310 fdret = FLOW_DISSECT_RET_OUT_BAD;
1311 break;
1312 }
1313
d5709f7a
HHZ		 1314 proto = vlan->h_vlan_encapsulated_proto;
1315 nhoff += sizeof(*vlan);
d5709f7a 1316 }
0744dd00 1317
9f87eb42
QY		 1318 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_NUM_OF_VLANS) &&
1319 !(key_control->flags & FLOW_DIS_ENCAPSULATION)) {
34951fcf
BS		 1320 struct flow_dissector_key_num_of_vlans *key_nvs;
1321
1322 key_nvs = skb_flow_dissector_target(flow_dissector,
1323 FLOW_DISSECTOR_KEY_NUM_OF_VLANS,
1324 target_container);
1325 key_nvs->num_of_vlans++;
1326 }
1327
24c590e3
JL		 1328 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1329 dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1330 } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1331 dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1332 } else {
1333 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1334 break;
1335 }
1336
1337 if (dissector_uses_key(flow_dissector, dissector_vlan)) {
f6a66927 1338 key_vlan = skb_flow_dissector_target(flow_dissector,
24c590e3 1339 dissector_vlan,
d34af823
TH		 1340 target_container);
1341
24c590e3 1342 if (!vlan) {
f6a66927 1343 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
9b319148 1344 key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
f6a66927
HHZ		 1345 } else {
1346 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
d5709f7a 1347 VLAN_VID_MASK;
f6a66927
HHZ		 1348 key_vlan->vlan_priority =
1349 (ntohs(vlan->h_vlan_TCI) &
1350 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1351 }
2064c3d4 1352 key_vlan->vlan_tpid = saved_vlan_tpid;
2105f700 1353 key_vlan->vlan_eth_type = proto;
d34af823
TH		 1354 }
1355
3a1214e8
TH		 1356 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1357 break;
0744dd00 1358 }
2b8837ae 1359 case htons(ETH_P_PPP_SES): {
0744dd00
ED		 1360 struct {
1361 struct pppoe_hdr hdr;
1362 __be16 proto;
1363 } *hdr, _hdr;
46126db9
WD		 1364 u16 ppp_proto;
1365
690e36e7 1366 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
3a1214e8
TH		 1367 if (!hdr) {
1368 fdret = FLOW_DISSECT_RET_OUT_BAD;
1369 break;
1370 }
1371
f86d1fbb 1372 if (!is_pppoe_ses_hdr_valid(&hdr->hdr)) {
46126db9
WD		 1373 fdret = FLOW_DISSECT_RET_OUT_BAD;
1374 break;
1375 }
1376
1377 /* least significant bit of the most significant octet
1378 * indicates if protocol field was compressed
1379 */
1380 ppp_proto = ntohs(hdr->proto);
1381 if (ppp_proto & 0x0100) {
1382 ppp_proto = ppp_proto >> 8;
1383 nhoff += PPPOE_SES_HLEN - 1;
1384 } else {
1385 nhoff += PPPOE_SES_HLEN;
1386 }
1387
1388 if (ppp_proto == PPP_IP) {
3a1214e8
TH		 1389 proto = htons(ETH_P_IP);
1390 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
46126db9 1391 } else if (ppp_proto == PPP_IPV6) {
3a1214e8
TH		 1392 proto = htons(ETH_P_IPV6);
1393 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
46126db9
WD		 1394 } else if (ppp_proto == PPP_MPLS_UC) {
1395 proto = htons(ETH_P_MPLS_UC);
1396 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1397 } else if (ppp_proto == PPP_MPLS_MC) {
1398 proto = htons(ETH_P_MPLS_MC);
1399 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1400 } else if (ppp_proto_is_valid(ppp_proto)) {
1401 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1402 } else {
3a1214e8
TH		 1403 fdret = FLOW_DISSECT_RET_OUT_BAD;
1404 break;
0744dd00 1405 }
46126db9
WD		 1406
1407 if (dissector_uses_key(flow_dissector,
1408 FLOW_DISSECTOR_KEY_PPPOE)) {
1409 struct flow_dissector_key_pppoe *key_pppoe;
1410
1411 key_pppoe = skb_flow_dissector_target(flow_dissector,
1412 FLOW_DISSECTOR_KEY_PPPOE,
1413 target_container);
1414 key_pppoe->session_id = hdr->hdr.sid;
1415 key_pppoe->ppp_proto = htons(ppp_proto);
1416 key_pppoe->type = htons(ETH_P_PPP_SES);
1417 }
3a1214e8 1418 break;
0744dd00 1419 }
08bfc9cb 1420 case htons(ETH_P_TIPC): {
8d6e79d3
JM		 1421 struct tipc_basic_hdr *hdr, _hdr;
1422
1423 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1424 data, hlen, &_hdr);
3a1214e8
TH		 1425 if (!hdr) {
1426 fdret = FLOW_DISSECT_RET_OUT_BAD;
1427 break;
1428 }
06635a35 1429
20a17bf6 1430 if (dissector_uses_key(flow_dissector,
8d6e79d3 1431 FLOW_DISSECTOR_KEY_TIPC)) {
06635a35 1432 key_addrs = skb_flow_dissector_target(flow_dissector,
8d6e79d3 1433 FLOW_DISSECTOR_KEY_TIPC,
06635a35 1434 target_container);
8d6e79d3
JM		 1435 key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1436 key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
06635a35 1437 }
3a1214e8
TH		 1438 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1439 break;
08bfc9cb 1440 }
b3baa0fb
TH		 1441
1442 case htons(ETH_P_MPLS_UC):
4a5d6c8b 1443 case htons(ETH_P_MPLS_MC):
3a1214e8 1444 fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
4a5d6c8b 1445 target_container, data,
58cff782
GN		 1446 nhoff, hlen, mpls_lse,
1447 &mpls_el);
1448 nhoff += sizeof(struct mpls_label);
1449 mpls_lse++;
3a1214e8 1450 break;
56193d1b 1451 case htons(ETH_P_FCOE):
3a1214e8
TH		 1452 if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1453 fdret = FLOW_DISSECT_RET_OUT_BAD;
1454 break;
1455 }
224516b3
AD		 1456
1457 nhoff += FCOE_HEADER_LEN;
3a1214e8
TH		 1458 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1459 break;
55733350
SH		 1460
1461 case htons(ETH_P_ARP):
9bf881ff 1462 case htons(ETH_P_RARP):
3a1214e8 1463 fdret = __skb_flow_dissect_arp(skb, flow_dissector,
9bf881ff 1464 target_container, data,
3a1214e8
TH		 1465 nhoff, hlen);
1466 break;
1467
5b0890a9
SE		 1468 case htons(ETH_P_BATMAN):
1469 fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1470 &proto, &nhoff, hlen, flags);
1471 break;
1472
4f1cc51f
EBE		 1473 case htons(ETH_P_1588): {
1474 struct ptp_header *hdr, _hdr;
1475
1476 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
1477 hlen, &_hdr);
1478 if (!hdr) {
1479 fdret = FLOW_DISSECT_RET_OUT_BAD;
1480 break;
1481 }
1482
75ad80ed 1483 nhoff += sizeof(struct ptp_header);
4f1cc51f
EBE		 1484 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1485 break;
1486 }
1487
f65e5844 1488 case htons(ETH_P_PRP):
bf08824a
KK		 1489 case htons(ETH_P_HSR): {
1490 struct hsr_tag *hdr, _hdr;
1491
1492 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen,
1493 &_hdr);
1494 if (!hdr) {
1495 fdret = FLOW_DISSECT_RET_OUT_BAD;
1496 break;
1497 }
1498
1499 proto = hdr->encap_proto;
1500 nhoff += HSR_HLEN;
1501 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1502 break;
1503 }
1504
d7ad70b5
ZD		 1505 case htons(ETH_P_CFM):
1506 fdret = __skb_flow_dissect_cfm(skb, flow_dissector,
1507 target_container, data,
1508 nhoff, hlen);
1509 break;
1510
3a1214e8
TH		 1511 default:
1512 fdret = FLOW_DISSECT_RET_OUT_BAD;
1513 break;
1514 }
1515
1516 /* Process result of proto processing */
1517 switch (fdret) {
1518 case FLOW_DISSECT_RET_OUT_GOOD:
1519 goto out_good;
1520 case FLOW_DISSECT_RET_PROTO_AGAIN:
1eed4dfb
TH		 1521 if (skb_flow_dissect_allowed(&num_hdrs))
1522 goto proto_again;
1523 goto out_good;
3a1214e8
TH		 1524 case FLOW_DISSECT_RET_CONTINUE:
1525 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1526 break;
1527 case FLOW_DISSECT_RET_OUT_BAD:
0744dd00 1528 default:
a6e544b0 1529 goto out_bad;
0744dd00
ED		 1530 }
1531
6a74fcf4 1532ip_proto_again:
3a1214e8
TH		 1533 fdret = FLOW_DISSECT_RET_CONTINUE;
1534
0744dd00 1535 switch (ip_proto) {
7c92de8e 1536 case IPPROTO_GRE:
6de6e46d
YK		 1537 if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1538 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1539 break;
1540 }
1541
3a1214e8 1542 fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
7c92de8e 1543 target_container, data,
3a1214e8
TH		 1544 &proto, &nhoff, &hlen, flags);
1545 break;
1546
6a74fcf4
TH		 1547 case NEXTHDR_HOP:
1548 case NEXTHDR_ROUTING:
1549 case NEXTHDR_DEST: {
1550 u8 _opthdr[2], *opthdr;
1551
1552 if (proto != htons(ETH_P_IPV6))
1553 break;
1554
1555 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1556 data, hlen, &_opthdr);
3a1214e8
TH		 1557 if (!opthdr) {
1558 fdret = FLOW_DISSECT_RET_OUT_BAD;
1559 break;
1560 }
6a74fcf4 1561
1e98a0f0
ED		 1562 ip_proto = opthdr[0];
1563 nhoff += (opthdr[1] + 1) << 3;
6a74fcf4 1564
3a1214e8
TH		 1565 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1566 break;
6a74fcf4 1567 }
b840f28b
TH		 1568 case NEXTHDR_FRAGMENT: {
1569 struct frag_hdr _fh, *fh;
1570
1571 if (proto != htons(ETH_P_IPV6))
1572 break;
1573
1574 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1575 data, hlen, &_fh);
1576
3a1214e8
TH		 1577 if (!fh) {
1578 fdret = FLOW_DISSECT_RET_OUT_BAD;
1579 break;
1580 }
b840f28b 1581
4b36993d 1582 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
b840f28b
TH		 1583
1584 nhoff += sizeof(_fh);
43d2ccb3 1585 ip_proto = fh->nexthdr;
b840f28b
TH		 1586
1587 if (!(fh->frag_off & htons(IP6_OFFSET))) {
4b36993d 1588 key_control->flags |= FLOW_DIS_FIRST_FRAG;
3a1214e8
TH		 1589 if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1590 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1591 break;
1592 }
b840f28b 1593 }
3a1214e8
TH		 1594
1595 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1596 break;
b840f28b 1597 }
0744dd00 1598 case IPPROTO_IPIP:
6de6e46d
YK		 1599 if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1600 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1601 break;
1602 }
1603
fca41895 1604 proto = htons(ETH_P_IP);
823b9693 1605
4b36993d 1606 key_control->flags |= FLOW_DIS_ENCAPSULATION;
3a1214e8
TH		 1607 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1608 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1609 break;
1610 }
1611
1612 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1613 break;
823b9693 1614
b438f940 1615 case IPPROTO_IPV6:
6de6e46d
YK		 1616 if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1617 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1618 break;
1619 }
1620
b438f940 1621 proto = htons(ETH_P_IPV6);
823b9693 1622
4b36993d 1623 key_control->flags |= FLOW_DIS_ENCAPSULATION;
3a1214e8
TH		 1624 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1625 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1626 break;
1627 }
1628
1629 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1630 break;
1631
823b9693 1632
b3baa0fb
TH		 1633 case IPPROTO_MPLS:
1634 proto = htons(ETH_P_MPLS_UC);
3a1214e8
TH		 1635 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1636 break;
1637
ac4bb5de
JP		 1638 case IPPROTO_TCP:
1639 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1640 data, nhoff, hlen);
1641 break;
3a1214e8 1642
3b336d6f
MC		 1643 case IPPROTO_ICMP:
1644 case IPPROTO_ICMPV6:
1645 __skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1646 data, nhoff, hlen);
1647 break;
dda2fa08
WD		 1648 case IPPROTO_L2TP:
1649 __skb_flow_dissect_l2tpv3(skb, flow_dissector, target_container,
1650 data, nhoff, hlen);
1651 break;
a57c34a8
RK		 1652 case IPPROTO_ESP:
1653 __skb_flow_dissect_esp(skb, flow_dissector, target_container,
1654 data, nhoff, hlen);
1655 break;
1656 case IPPROTO_AH:
1657 __skb_flow_dissect_ah(skb, flow_dissector, target_container,
1658 data, nhoff, hlen);
1659 break;
0744dd00
ED		 1660 default:
1661 break;
1662 }
1663
8ffb055b
YK		 1664 if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT))
1665 __skb_flow_dissect_ports(skb, flow_dissector, target_container,
1666 data, nhoff, ip_proto, hlen);
5af7fb6e 1667
3a1214e8
TH		 1668 /* Process result of IP proto processing */
1669 switch (fdret) {
1670 case FLOW_DISSECT_RET_PROTO_AGAIN:
1eed4dfb
TH		 1671 if (skb_flow_dissect_allowed(&num_hdrs))
1672 goto proto_again;
1673 break;
3a1214e8 1674 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1eed4dfb
TH		 1675 if (skb_flow_dissect_allowed(&num_hdrs))
1676 goto ip_proto_again;
1677 break;
3a1214e8
TH		 1678 case FLOW_DISSECT_RET_OUT_GOOD:
1679 case FLOW_DISSECT_RET_CONTINUE:
1680 break;
1681 case FLOW_DISSECT_RET_OUT_BAD:
1682 default:
1683 goto out_bad;
1684 }
1685
a6e544b0
TH		 1686out_good:
1687 ret = true;
1688
34fad54c 1689out:
d0c081b4 1690 key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
a6e544b0
TH		 1691 key_basic->n_proto = proto;
1692 key_basic->ip_proto = ip_proto;
a6e544b0
TH		 1693
1694 return ret;
34fad54c
ED		 1695
1696out_bad:
1697 ret = false;
34fad54c 1698 goto out;
0744dd00 1699}
690e36e7 1700EXPORT_SYMBOL(__skb_flow_dissect);
441d9d32 1701
49ecc2e9 1702static siphash_aligned_key_t hashrnd;
66415cf8
HFS		 1703static __always_inline void __flow_hash_secret_init(void)
1704{
1705 net_get_random_once(&hashrnd, sizeof(hashrnd));
1706}
1707
55667441 1708static const void *flow_keys_hash_start(const struct flow_keys *flow)
42aecaa9 1709{
55667441
ED		 1710 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1711 return &flow->FLOW_KEYS_HASH_START_FIELD;
42aecaa9
TH		 1712}
1713
20a17bf6 1714static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
42aecaa9 1715{
c3f83241 1716 size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
d31e9558 1717
42aecaa9 1718 BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
c3f83241
TH		 1719
1720 switch (flow->control.addr_type) {
1721 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1722 diff -= sizeof(flow->addrs.v4addrs);
1723 break;
1724 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1725 diff -= sizeof(flow->addrs.v6addrs);
1726 break;
8d6e79d3
JM		 1727 case FLOW_DISSECTOR_KEY_TIPC:
1728 diff -= sizeof(flow->addrs.tipckey);
9f249089 1729 break;
c3f83241 1730 }
55667441 1731 return sizeof(*flow) - diff;
c3f83241
TH		 1732}
1733
1734__be32 flow_get_u32_src(const struct flow_keys *flow)
1735{
1736 switch (flow->control.addr_type) {
1737 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1738 return flow->addrs.v4addrs.src;
1739 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1740 return (__force __be32)ipv6_addr_hash(
1741 &flow->addrs.v6addrs.src);
8d6e79d3
JM		 1742 case FLOW_DISSECTOR_KEY_TIPC:
1743 return flow->addrs.tipckey.key;
c3f83241
TH		 1744 default:
1745 return 0;
1746 }
1747}
1748EXPORT_SYMBOL(flow_get_u32_src);
1749
1750__be32 flow_get_u32_dst(const struct flow_keys *flow)
1751{
1752 switch (flow->control.addr_type) {
1753 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1754 return flow->addrs.v4addrs.dst;
1755 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1756 return (__force __be32)ipv6_addr_hash(
1757 &flow->addrs.v6addrs.dst);
1758 default:
1759 return 0;
1760 }
1761}
1762EXPORT_SYMBOL(flow_get_u32_dst);
1763
1e60cebf 1764/* Sort the source and destination IP and the ports,
98298e6c
MC		 1765 * to have consistent hash within the two directions
1766 */
c3f83241
TH		 1767static inline void __flow_hash_consistentify(struct flow_keys *keys)
1768{
1769 int addr_diff, i;
1770
1771 switch (keys->control.addr_type) {
1772 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
64ae13ed
LC		 1773 if ((__force u32)keys->addrs.v4addrs.dst <
1774 (__force u32)keys->addrs.v4addrs.src)
c3f83241 1775 swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1e60cebf 1776
1777 if ((__force u16)keys->ports.dst <
1778 (__force u16)keys->ports.src) {
c3f83241
TH		 1779 swap(keys->ports.src, keys->ports.dst);
1780 }
1781 break;
1782 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1783 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1784 &keys->addrs.v6addrs.src,
1785 sizeof(keys->addrs.v6addrs.dst));
1e60cebf 1786 if (addr_diff < 0) {
c3f83241
TH		 1787 for (i = 0; i < 4; i++)
1788 swap(keys->addrs.v6addrs.src.s6_addr32[i],
1789 keys->addrs.v6addrs.dst.s6_addr32[i]);
1e60cebf 1790 }
1791 if ((__force u16)keys->ports.dst <
1792 (__force u16)keys->ports.src) {
c3f83241
TH		 1793 swap(keys->ports.src, keys->ports.dst);
1794 }
1795 break;
1796 }
66415cf8
HFS		 1797}
1798
55667441
ED		 1799static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1800 const siphash_key_t *keyval)
5ed20a68
TH		 1801{
1802 u32 hash;
1803
c3f83241 1804 __flow_hash_consistentify(keys);
5ed20a68 1805
55667441
ED		 1806 hash = siphash(flow_keys_hash_start(keys),
1807 flow_keys_hash_length(keys), keyval);
5ed20a68
TH		 1808 if (!hash)
1809 hash = 1;
1810
1811 return hash;
1812}
1813
1814u32 flow_hash_from_keys(struct flow_keys *keys)
1815{
50fb7992 1816 __flow_hash_secret_init();
55667441 1817 return __flow_hash_from_keys(keys, &hashrnd);
5ed20a68
TH		 1818}
1819EXPORT_SYMBOL(flow_hash_from_keys);
1820
4ee2a8ca
PM		 1821u32 flow_hash_from_keys_seed(struct flow_keys *keys,
1822 const siphash_key_t *keyval)
1823{
1824 return __flow_hash_from_keys(keys, keyval);
1825}
1826EXPORT_SYMBOL(flow_hash_from_keys_seed);
1827
50fb7992 1828static inline u32 ___skb_get_hash(const struct sk_buff *skb,
55667441
ED		 1829 struct flow_keys *keys,
1830 const siphash_key_t *keyval)
50fb7992 1831{
6db61d79
TH		 1832 skb_flow_dissect_flow_keys(skb, keys,
1833 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
50fb7992
TH		 1834
1835 return __flow_hash_from_keys(keys, keyval);
1836}
1837
2f59e1eb
TH		 1838struct _flow_keys_digest_data {
1839 __be16 n_proto;
1840 u8 ip_proto;
1841 u8 padding;
1842 __be32 ports;
1843 __be32 src;
1844 __be32 dst;
1845};
1846
1847void make_flow_keys_digest(struct flow_keys_digest *digest,
1848 const struct flow_keys *flow)
1849{
1850 struct _flow_keys_digest_data *data =
1851 (struct _flow_keys_digest_data *)digest;
1852
1853 BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1854
1855 memset(digest, 0, sizeof(*digest));
1856
06635a35
JP		 1857 data->n_proto = flow->basic.n_proto;
1858 data->ip_proto = flow->basic.ip_proto;
1859 data->ports = flow->ports.ports;
c3f83241
TH		 1860 data->src = flow->addrs.v4addrs.src;
1861 data->dst = flow->addrs.v4addrs.dst;
2f59e1eb
TH		 1862}
1863EXPORT_SYMBOL(make_flow_keys_digest);
1864
eb70db87
DM		 1865static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1866
d1dab4f7 1867u32 __skb_get_hash_symmetric_net(const struct net *net, const struct sk_buff *skb)
eb70db87
DM		 1868{
1869 struct flow_keys keys;
1870
1871 __flow_hash_secret_init();
1872
1873 memset(&keys, 0, sizeof(keys));
d1dab4f7 1874 __skb_flow_dissect(net, skb, &flow_keys_dissector_symmetric,
a5e2151f 1875 &keys, NULL, 0, 0, 0, 0);
eb70db87 1876
55667441 1877 return __flow_hash_from_keys(&keys, &hashrnd);
eb70db87 1878}
d1dab4f7 1879EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric_net);
eb70db87 1880
d4fd3275 1881/**
b975d3ee
FW		 1882 * __skb_get_hash_net: calculate a flow hash
1883 * @net: associated network namespace, derived from @skb if NULL
d4fd3275
JP		 1884 * @skb: sk_buff to calculate flow hash from
1885 *
1886 * This function calculates a flow hash based on src/dst addresses
61b905da
TH		 1887 * and src/dst port numbers. Sets hash in skb to non-zero hash value
1888 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
441d9d32
CW		 1889 * if hash is a canonical 4-tuple hash over transport ports.
1890 */
b975d3ee 1891void __skb_get_hash_net(const struct net *net, struct sk_buff *skb)
441d9d32
CW		 1892{
1893 struct flow_keys keys;
635c223c 1894 u32 hash;
441d9d32 1895
b975d3ee
FW		 1896 memset(&keys, 0, sizeof(keys));
1897
1898 __skb_flow_dissect(net, skb, &flow_keys_dissector,
1899 &keys, NULL, 0, 0, 0,
1900 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1901
50fb7992
TH		 1902 __flow_hash_secret_init();
1903
b975d3ee 1904 hash = __flow_hash_from_keys(&keys, &hashrnd);
635c223c
GF		 1905
1906 __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
441d9d32 1907}
b975d3ee 1908EXPORT_SYMBOL(__skb_get_hash_net);
441d9d32 1909
55667441
ED		 1910__u32 skb_get_hash_perturb(const struct sk_buff *skb,
1911 const siphash_key_t *perturb)
50fb7992
TH		 1912{
1913 struct flow_keys keys;
1914
1915 return ___skb_get_hash(skb, &keys, perturb);
1916}
1917EXPORT_SYMBOL(skb_get_hash_perturb);
1918
f96533cd 1919u32 __skb_get_poff(const struct sk_buff *skb, const void *data,
72a338bc 1920 const struct flow_keys_basic *keys, int hlen)
f77668dc 1921{
42aecaa9 1922 u32 poff = keys->control.thoff;
f77668dc 1923
43d2ccb3
AD		 1924 /* skip L4 headers for fragments after the first */
1925 if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1926 !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1927 return poff;
1928
06635a35 1929 switch (keys->basic.ip_proto) {
f77668dc 1930 case IPPROTO_TCP: {
5af7fb6e
AD		 1931 /* access doff as u8 to avoid unaligned access */
1932 const u8 *doff;
1933 u8 _doff;
f77668dc 1934
5af7fb6e
AD		 1935 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1936 data, hlen, &_doff);
1937 if (!doff)
f77668dc
DB		 1938 return poff;
1939
5af7fb6e 1940 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
f77668dc
DB		 1941 break;
1942 }
1943 case IPPROTO_UDP:
1944 case IPPROTO_UDPLITE:
1945 poff += sizeof(struct udphdr);
1946 break;
1947 /* For the rest, we do not really care about header
1948 * extensions at this point for now.
1949 */
1950 case IPPROTO_ICMP:
1951 poff += sizeof(struct icmphdr);
1952 break;
1953 case IPPROTO_ICMPV6:
1954 poff += sizeof(struct icmp6hdr);
1955 break;
1956 case IPPROTO_IGMP:
1957 poff += sizeof(struct igmphdr);
1958 break;
1959 case IPPROTO_DCCP:
1960 poff += sizeof(struct dccp_hdr);
1961 break;
1962 case IPPROTO_SCTP:
1963 poff += sizeof(struct sctphdr);
1964 break;
1965 }
1966
1967 return poff;
1968}
1969
0db89b8b
JP		 1970/**
1971 * skb_get_poff - get the offset to the payload
1972 * @skb: sk_buff to get the payload offset from
1973 *
1974 * The function will get the offset to the payload as far as it could
1975 * be dissected. The main user is currently BPF, so that we can dynamically
56193d1b
AD		 1976 * truncate packets without needing to push actual payload to the user
1977 * space and can analyze headers only, instead.
1978 */
1979u32 skb_get_poff(const struct sk_buff *skb)
1980{
72a338bc 1981 struct flow_keys_basic keys;
56193d1b 1982
3cbf4ffb
SF		 1983 if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1984 NULL, 0, 0, 0, 0))
56193d1b
AD		 1985 return 0;
1986
1987 return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1988}
06635a35 1989
20a17bf6 1990__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
a17ace95
DM		 1991{
1992 memset(keys, 0, sizeof(*keys));
1993
1994 memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1995 sizeof(keys->addrs.v6addrs.src));
1996 memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1997 sizeof(keys->addrs.v6addrs.dst));
1998 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1999 keys->ports.src = fl6->fl6_sport;
2000 keys->ports.dst = fl6->fl6_dport;
2001 keys->keyid.keyid = fl6->fl6_gre_key;
fa1be7e0 2002 keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
a17ace95
DM		 2003 keys->basic.ip_proto = fl6->flowi6_proto;
2004
2005 return flow_hash_from_keys(keys);
2006}
2007EXPORT_SYMBOL(__get_hash_from_flowi6);
2008
06635a35 2009static const struct flow_dissector_key flow_keys_dissector_keys[] = {
42aecaa9
TH		 2010 {
2011 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
2012 .offset = offsetof(struct flow_keys, control),
2013 },
06635a35
JP		 2014 {
2015 .key_id = FLOW_DISSECTOR_KEY_BASIC,
2016 .offset = offsetof(struct flow_keys, basic),
2017 },
2018 {
2019 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
c3f83241
TH		 2020 .offset = offsetof(struct flow_keys, addrs.v4addrs),
2021 },
2022 {
2023 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
2024 .offset = offsetof(struct flow_keys, addrs.v6addrs),
06635a35 2025 },
9f249089 2026 {
8d6e79d3
JM		 2027 .key_id = FLOW_DISSECTOR_KEY_TIPC,
2028 .offset = offsetof(struct flow_keys, addrs.tipckey),
9f249089 2029 },
06635a35
JP		 2030 {
2031 .key_id = FLOW_DISSECTOR_KEY_PORTS,
2032 .offset = offsetof(struct flow_keys, ports),
2033 },
d34af823 2034 {
f6a66927
HHZ		 2035 .key_id = FLOW_DISSECTOR_KEY_VLAN,
2036 .offset = offsetof(struct flow_keys, vlan),
d34af823 2037 },
87ee9e52
TH		 2038 {
2039 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
2040 .offset = offsetof(struct flow_keys, tags),
2041 },
1fdd512c
TH		 2042 {
2043 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
2044 .offset = offsetof(struct flow_keys, keyid),
2045 },
06635a35
JP		 2046};
2047
eb70db87
DM		 2048static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
2049 {
2050 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
2051 .offset = offsetof(struct flow_keys, control),
2052 },
2053 {
2054 .key_id = FLOW_DISSECTOR_KEY_BASIC,
2055 .offset = offsetof(struct flow_keys, basic),
2056 },
2057 {
2058 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
2059 .offset = offsetof(struct flow_keys, addrs.v4addrs),
2060 },
2061 {
2062 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
2063 .offset = offsetof(struct flow_keys, addrs.v6addrs),
2064 },
2065 {
2066 .key_id = FLOW_DISSECTOR_KEY_PORTS,
2067 .offset = offsetof(struct flow_keys, ports),
2068 },
2069};
2070
72a338bc 2071static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
42aecaa9
TH		 2072 {
2073 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
2074 .offset = offsetof(struct flow_keys, control),
2075 },
06635a35
JP		 2076 {
2077 .key_id = FLOW_DISSECTOR_KEY_BASIC,
2078 .offset = offsetof(struct flow_keys, basic),
2079 },
2080};
2081
2082struct flow_dissector flow_keys_dissector __read_mostly;
2083EXPORT_SYMBOL(flow_keys_dissector);
2084
72a338bc
PA		 2085struct flow_dissector flow_keys_basic_dissector __read_mostly;
2086EXPORT_SYMBOL(flow_keys_basic_dissector);
06635a35
JP		 2087
2088static int __init init_default_flow_dissectors(void)
2089{
2090 skb_flow_dissector_init(&flow_keys_dissector,
2091 flow_keys_dissector_keys,
2092 ARRAY_SIZE(flow_keys_dissector_keys));
eb70db87
DM		 2093 skb_flow_dissector_init(&flow_keys_dissector_symmetric,
2094 flow_keys_dissector_symmetric_keys,
2095 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
72a338bc
PA		 2096 skb_flow_dissector_init(&flow_keys_basic_dissector,
2097 flow_keys_basic_dissector_keys,
2098 ARRAY_SIZE(flow_keys_basic_dissector_keys));
b27f7bb5 2099 return 0;
5cf65922 2100}
c9b8af13 2101core_initcall(init_default_flow_dissectors);
Linux 6.x block layer and io_uring tree(s)