1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/kernel.h>
3 #include <linux/skbuff.h>
4 #include <linux/export.h>
5 #include <linux/ip.h>
6 #include <linux/ipv6.h>
7 #include <linux/if_vlan.h>
8 #include <net/dsa.h>
9 #include <net/dst_metadata.h>
10 #include <net/ip.h>
11 #include <net/ipv6.h>
12 #include <net/gre.h>
13 #include <net/pptp.h>
14 #include <net/tipc.h>
15 #include <linux/igmp.h>
16 #include <linux/icmp.h>
17 #include <linux/sctp.h>
18 #include <linux/dccp.h>
19 #include <linux/if_tunnel.h>
20 #include <linux/if_pppox.h>
21 #include <linux/ppp_defs.h>
22 #include <linux/stddef.h>
23 #include <linux/if_ether.h>
24 #include <linux/mpls.h>
25 #include <linux/tcp.h>
26 #include <net/flow_dissector.h>
27 #include <scsi/fc/fc_fcoe.h>
28 #include <uapi/linux/batadv_packet.h>
29 #include <linux/bpf.h>
30 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
31 #include <net/netfilter/nf_conntrack_core.h>
32 #include <net/netfilter/nf_conntrack_labels.h>
33 #endif
34
35 static DEFINE_MUTEX(flow_dissector_mutex);
36
37 static void dissector_set_key(struct flow_dissector *flow_dissector,
38 enum flow_dissector_key_id key_id)
39 {
40 flow_dissector->used_keys |= (1 << key_id);
41 }
42
43 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
44 const struct flow_dissector_key *key,
45 unsigned int key_count)
46 {
47 unsigned int i;
48
49 memset(flow_dissector, 0, sizeof(*flow_dissector));
50
51 for (i = 0; i < key_count; i++, key++) {
52 /* User should make sure that every key target offset is withing
53 * boundaries of unsigned short.
54 */
55 BUG_ON(key->offset > USHRT_MAX);
56 BUG_ON(dissector_uses_key(flow_dissector,
57 key->key_id));
58
59 dissector_set_key(flow_dissector, key->key_id);
60 flow_dissector->offset[key->key_id] = key->offset;
61 }
62
63 /* Ensure that the dissector always includes control and basic key.
64 * That way we are able to avoid handling lack of these in fast path.
65 */
66 BUG_ON(!dissector_uses_key(flow_dissector,
67 FLOW_DISSECTOR_KEY_CONTROL));
68 BUG_ON(!dissector_uses_key(flow_dissector,
69 FLOW_DISSECTOR_KEY_BASIC));
70 }
71 EXPORT_SYMBOL(skb_flow_dissector_init);
72
73 int skb_flow_dissector_prog_query(const union bpf_attr *attr,
74 union bpf_attr __user *uattr)
75 {
76 __u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
77 u32 prog_id, prog_cnt = 0, flags = 0;
78 struct bpf_prog *attached;
79 struct net *net;
80
81 if (attr->query.query_flags)
82 return -EINVAL;
83
84 net = get_net_ns_by_fd(attr->query.target_fd);
85 if (IS_ERR(net))
86 return PTR_ERR(net);
87
88 rcu_read_lock();
89 attached = rcu_dereference(net->flow_dissector_prog);
90 if (attached) {
91 prog_cnt = 1;
92 prog_id = attached->aux->id;
93 }
94 rcu_read_unlock();
95
96 put_net(net);
97
98 if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags)))
99 return -EFAULT;
100 if (copy_to_user(&uattr->query.prog_cnt, &prog_cnt, sizeof(prog_cnt)))
101 return -EFAULT;
102
103 if (!attr->query.prog_cnt || !prog_ids || !prog_cnt)
104 return 0;
105
106 if (copy_to_user(prog_ids, &prog_id, sizeof(u32)))
107 return -EFAULT;
108
109 return 0;
110 }
111
112 int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
113 struct bpf_prog *prog)
114 {
115 struct bpf_prog *attached;
116 struct net *net;
117 int ret = 0;
118
119 net = current->nsproxy->net_ns;
120 mutex_lock(&flow_dissector_mutex);
121
122 if (net == &init_net) {
123 /* BPF flow dissector in the root namespace overrides
124 * any per-net-namespace one. When attaching to root,
125 * make sure we don't have any BPF program attached
126 * to the non-root namespaces.
127 */
128 struct net *ns;
129
130 for_each_net(ns) {
131 if (ns == &init_net)
132 continue;
133 if (rcu_access_pointer(ns->flow_dissector_prog)) {
134 ret = -EEXIST;
135 goto out;
136 }
137 }
138 } else {
139 /* Make sure root flow dissector is not attached
140 * when attaching to the non-root namespace.
141 */
142 if (rcu_access_pointer(init_net.flow_dissector_prog)) {
143 ret = -EEXIST;
144 goto out;
145 }
146 }
147
148 attached = rcu_dereference_protected(net->flow_dissector_prog,
149 lockdep_is_held(&flow_dissector_mutex));
150 if (attached == prog) {
151 /* The same program cannot be attached twice */
152 ret = -EINVAL;
153 goto out;
154 }
155 rcu_assign_pointer(net->flow_dissector_prog, prog);
156 if (attached)
157 bpf_prog_put(attached);
158 out:
159 mutex_unlock(&flow_dissector_mutex);
160 return ret;
161 }
162
163 static int flow_dissector_bpf_prog_detach(struct net *net)
164 {
165 struct bpf_prog *attached;
166
167 mutex_lock(&flow_dissector_mutex);
168 attached = rcu_dereference_protected(net->flow_dissector_prog,
169 lockdep_is_held(&flow_dissector_mutex));
170 if (!attached) {
171 mutex_unlock(&flow_dissector_mutex);
172 return -ENOENT;
173 }
174 RCU_INIT_POINTER(net->flow_dissector_prog, NULL);
175 bpf_prog_put(attached);
176 mutex_unlock(&flow_dissector_mutex);
177 return 0;
178 }
179
180 int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr)
181 {
182 return flow_dissector_bpf_prog_detach(current->nsproxy->net_ns);
183 }
184
185 static void __net_exit flow_dissector_pernet_pre_exit(struct net *net)
186 {
187 /* We're not racing with attach/detach because there are no
188 * references to netns left when pre_exit gets called.
189 */
190 if (rcu_access_pointer(net->flow_dissector_prog))
191 flow_dissector_bpf_prog_detach(net);
192 }
193
194 static struct pernet_operations flow_dissector_pernet_ops __net_initdata = {
195 .pre_exit = flow_dissector_pernet_pre_exit,
196 };
197
198 /**
199 * __skb_flow_get_ports - extract the upper layer ports and return them
200 * @skb: sk_buff to extract the ports from
201 * @thoff: transport header offset
202 * @ip_proto: protocol for which to get port offset
203 * @data: raw buffer pointer to the packet, if NULL use skb->data
204 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
205 *
206 * The function will try to retrieve the ports at offset thoff + poff where poff
207 * is the protocol port offset returned from proto_ports_offset
208 */
209 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
210 void *data, int hlen)
211 {
212 int poff = proto_ports_offset(ip_proto);
213
214 if (!data) {
215 data = skb->data;
216 hlen = skb_headlen(skb);
217 }
218
219 if (poff >= 0) {
220 __be32 *ports, _ports;
221
222 ports = __skb_header_pointer(skb, thoff + poff,
223 sizeof(_ports), data, hlen, &_ports);
224 if (ports)
225 return *ports;
226 }
227
228 return 0;
229 }
230 EXPORT_SYMBOL(__skb_flow_get_ports);
231
232 static bool icmp_has_id(u8 type)
233 {
234 switch (type) {
235 case ICMP_ECHO:
236 case ICMP_ECHOREPLY:
237 case ICMP_TIMESTAMP:
238 case ICMP_TIMESTAMPREPLY:
239 case ICMPV6_ECHO_REQUEST:
240 case ICMPV6_ECHO_REPLY:
241 return true;
242 }
243
244 return false;
245 }
246
247 /**
248 * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields
249 * @skb: sk_buff to extract from
250 * @key_icmp: struct flow_dissector_key_icmp to fill
251 * @data: raw buffer pointer to the packet
252 * @thoff: offset to extract at
253 * @hlen: packet header length
254 */
255 void skb_flow_get_icmp_tci(const struct sk_buff *skb,
256 struct flow_dissector_key_icmp *key_icmp,
257 void *data, int thoff, int hlen)
258 {
259 struct icmphdr *ih, _ih;
260
261 ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih);
262 if (!ih)
263 return;
264
265 key_icmp->type = ih->type;
266 key_icmp->code = ih->code;
267
268 /* As we use 0 to signal that the Id field is not present,
269 * avoid confusion with packets without such field
270 */
271 if (icmp_has_id(ih->type))
272 key_icmp->id = ih->un.echo.id ? : 1;
273 else
274 key_icmp->id = 0;
275 }
276 EXPORT_SYMBOL(skb_flow_get_icmp_tci);
277
278 /* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet
279 * using skb_flow_get_icmp_tci().
280 */
281 static void __skb_flow_dissect_icmp(const struct sk_buff *skb,
282 struct flow_dissector *flow_dissector,
283 void *target_container,
284 void *data, int thoff, int hlen)
285 {
286 struct flow_dissector_key_icmp *key_icmp;
287
288 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP))
289 return;
290
291 key_icmp = skb_flow_dissector_target(flow_dissector,
292 FLOW_DISSECTOR_KEY_ICMP,
293 target_container);
294
295 skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen);
296 }
297
298 void skb_flow_dissect_meta(const struct sk_buff *skb,
299 struct flow_dissector *flow_dissector,
300 void *target_container)
301 {
302 struct flow_dissector_key_meta *meta;
303
304 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
305 return;
306
307 meta = skb_flow_dissector_target(flow_dissector,
308 FLOW_DISSECTOR_KEY_META,
309 target_container);
310 meta->ingress_ifindex = skb->skb_iif;
311 }
312 EXPORT_SYMBOL(skb_flow_dissect_meta);
313
314 static void
315 skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
316 struct flow_dissector *flow_dissector,
317 void *target_container)
318 {
319 struct flow_dissector_key_control *ctrl;
320
321 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
322 return;
323
324 ctrl = skb_flow_dissector_target(flow_dissector,
325 FLOW_DISSECTOR_KEY_ENC_CONTROL,
326 target_container);
327 ctrl->addr_type = type;
328 }
329
330 void
331 skb_flow_dissect_ct(const struct sk_buff *skb,
332 struct flow_dissector *flow_dissector,
333 void *target_container,
334 u16 *ctinfo_map,
335 size_t mapsize)
336 {
337 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
338 struct flow_dissector_key_ct *key;
339 enum ip_conntrack_info ctinfo;
340 struct nf_conn_labels *cl;
341 struct nf_conn *ct;
342
343 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
344 return;
345
346 ct = nf_ct_get(skb, &ctinfo);
347 if (!ct)
348 return;
349
350 key = skb_flow_dissector_target(flow_dissector,
351 FLOW_DISSECTOR_KEY_CT,
352 target_container);
353
354 if (ctinfo < mapsize)
355 key->ct_state = ctinfo_map[ctinfo];
356 #if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
357 key->ct_zone = ct->zone.id;
358 #endif
359 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
360 key->ct_mark = ct->mark;
361 #endif
362
363 cl = nf_ct_labels_find(ct);
364 if (cl)
365 memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
366 #endif /* CONFIG_NF_CONNTRACK */
367 }
368 EXPORT_SYMBOL(skb_flow_dissect_ct);
369
370 void
371 skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
372 struct flow_dissector *flow_dissector,
373 void *target_container)
374 {
375 struct ip_tunnel_info *info;
376 struct ip_tunnel_key *key;
377
378 /* A quick check to see if there might be something to do. */
379 if (!dissector_uses_key(flow_dissector,
380 FLOW_DISSECTOR_KEY_ENC_KEYID) &&
381 !dissector_uses_key(flow_dissector,
382 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
383 !dissector_uses_key(flow_dissector,
384 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
385 !dissector_uses_key(flow_dissector,
386 FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
387 !dissector_uses_key(flow_dissector,
388 FLOW_DISSECTOR_KEY_ENC_PORTS) &&
389 !dissector_uses_key(flow_dissector,
390 FLOW_DISSECTOR_KEY_ENC_IP) &&
391 !dissector_uses_key(flow_dissector,
392 FLOW_DISSECTOR_KEY_ENC_OPTS))
393 return;
394
395 info = skb_tunnel_info(skb);
396 if (!info)
397 return;
398
399 key = &info->key;
400
401 switch (ip_tunnel_info_af(info)) {
402 case AF_INET:
403 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
404 flow_dissector,
405 target_container);
406 if (dissector_uses_key(flow_dissector,
407 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
408 struct flow_dissector_key_ipv4_addrs *ipv4;
409
410 ipv4 = skb_flow_dissector_target(flow_dissector,
411 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
412 target_container);
413 ipv4->src = key->u.ipv4.src;
414 ipv4->dst = key->u.ipv4.dst;
415 }
416 break;
417 case AF_INET6:
418 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
419 flow_dissector,
420 target_container);
421 if (dissector_uses_key(flow_dissector,
422 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
423 struct flow_dissector_key_ipv6_addrs *ipv6;
424
425 ipv6 = skb_flow_dissector_target(flow_dissector,
426 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
427 target_container);
428 ipv6->src = key->u.ipv6.src;
429 ipv6->dst = key->u.ipv6.dst;
430 }
431 break;
432 }
433
434 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
435 struct flow_dissector_key_keyid *keyid;
436
437 keyid = skb_flow_dissector_target(flow_dissector,
438 FLOW_DISSECTOR_KEY_ENC_KEYID,
439 target_container);
440 keyid->keyid = tunnel_id_to_key32(key->tun_id);
441 }
442
443 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
444 struct flow_dissector_key_ports *tp;
445
446 tp = skb_flow_dissector_target(flow_dissector,
447 FLOW_DISSECTOR_KEY_ENC_PORTS,
448 target_container);
449 tp->src = key->tp_src;
450 tp->dst = key->tp_dst;
451 }
452
453 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
454 struct flow_dissector_key_ip *ip;
455
456 ip = skb_flow_dissector_target(flow_dissector,
457 FLOW_DISSECTOR_KEY_ENC_IP,
458 target_container);
459 ip->tos = key->tos;
460 ip->ttl = key->ttl;
461 }
462
463 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
464 struct flow_dissector_key_enc_opts *enc_opt;
465
466 enc_opt = skb_flow_dissector_target(flow_dissector,
467 FLOW_DISSECTOR_KEY_ENC_OPTS,
468 target_container);
469
470 if (info->options_len) {
471 enc_opt->len = info->options_len;
472 ip_tunnel_info_opts_get(enc_opt->data, info);
473 enc_opt->dst_opt_type = info->key.tun_flags &
474 TUNNEL_OPTIONS_PRESENT;
475 }
476 }
477 }
478 EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
479
480 static enum flow_dissect_ret
481 __skb_flow_dissect_mpls(const struct sk_buff *skb,
482 struct flow_dissector *flow_dissector,
483 void *target_container, void *data, int nhoff, int hlen)
484 {
485 struct flow_dissector_key_keyid *key_keyid;
486 struct mpls_label *hdr, _hdr[2];
487 u32 entry, label;
488
489 if (!dissector_uses_key(flow_dissector,
490 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
491 !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
492 return FLOW_DISSECT_RET_OUT_GOOD;
493
494 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
495 hlen, &_hdr);
496 if (!hdr)
497 return FLOW_DISSECT_RET_OUT_BAD;
498
499 entry = ntohl(hdr[0].entry);
500 label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
501
502 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
503 struct flow_dissector_key_mpls *key_mpls;
504
505 key_mpls = skb_flow_dissector_target(flow_dissector,
506 FLOW_DISSECTOR_KEY_MPLS,
507 target_container);
508 key_mpls->mpls_label = label;
509 key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK)
510 >> MPLS_LS_TTL_SHIFT;
511 key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK)
512 >> MPLS_LS_TC_SHIFT;
513 key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK)
514 >> MPLS_LS_S_SHIFT;
515 }
516
517 if (label == MPLS_LABEL_ENTROPY) {
518 key_keyid = skb_flow_dissector_target(flow_dissector,
519 FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
520 target_container);
521 key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK);
522 }
523 return FLOW_DISSECT_RET_OUT_GOOD;
524 }
525
526 static enum flow_dissect_ret
527 __skb_flow_dissect_arp(const struct sk_buff *skb,
528 struct flow_dissector *flow_dissector,
529 void *target_container, void *data, int nhoff, int hlen)
530 {
531 struct flow_dissector_key_arp *key_arp;
532 struct {
533 unsigned char ar_sha[ETH_ALEN];
534 unsigned char ar_sip[4];
535 unsigned char ar_tha[ETH_ALEN];
536 unsigned char ar_tip[4];
537 } *arp_eth, _arp_eth;
538 const struct arphdr *arp;
539 struct arphdr _arp;
540
541 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
542 return FLOW_DISSECT_RET_OUT_GOOD;
543
544 arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
545 hlen, &_arp);
546 if (!arp)
547 return FLOW_DISSECT_RET_OUT_BAD;
548
549 if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
550 arp->ar_pro != htons(ETH_P_IP) ||
551 arp->ar_hln != ETH_ALEN ||
552 arp->ar_pln != 4 ||
553 (arp->ar_op != htons(ARPOP_REPLY) &&
554 arp->ar_op != htons(ARPOP_REQUEST)))
555 return FLOW_DISSECT_RET_OUT_BAD;
556
557 arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
558 sizeof(_arp_eth), data,
559 hlen, &_arp_eth);
560 if (!arp_eth)
561 return FLOW_DISSECT_RET_OUT_BAD;
562
563 key_arp = skb_flow_dissector_target(flow_dissector,
564 FLOW_DISSECTOR_KEY_ARP,
565 target_container);
566
567 memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
568 memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
569
570 /* Only store the lower byte of the opcode;
571 * this covers ARPOP_REPLY and ARPOP_REQUEST.
572 */
573 key_arp->op = ntohs(arp->ar_op) & 0xff;
574
575 ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
576 ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
577
578 return FLOW_DISSECT_RET_OUT_GOOD;
579 }
580
581 static enum flow_dissect_ret
582 __skb_flow_dissect_gre(const struct sk_buff *skb,
583 struct flow_dissector_key_control *key_control,
584 struct flow_dissector *flow_dissector,
585 void *target_container, void *data,
586 __be16 *p_proto, int *p_nhoff, int *p_hlen,
587 unsigned int flags)
588 {
589 struct flow_dissector_key_keyid *key_keyid;
590 struct gre_base_hdr *hdr, _hdr;
591 int offset = 0;
592 u16 gre_ver;
593
594 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
595 data, *p_hlen, &_hdr);
596 if (!hdr)
597 return FLOW_DISSECT_RET_OUT_BAD;
598
599 /* Only look inside GRE without routing */
600 if (hdr->flags & GRE_ROUTING)
601 return FLOW_DISSECT_RET_OUT_GOOD;
602
603 /* Only look inside GRE for version 0 and 1 */
604 gre_ver = ntohs(hdr->flags & GRE_VERSION);
605 if (gre_ver > 1)
606 return FLOW_DISSECT_RET_OUT_GOOD;
607
608 *p_proto = hdr->protocol;
609 if (gre_ver) {
610 /* Version1 must be PPTP, and check the flags */
611 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
612 return FLOW_DISSECT_RET_OUT_GOOD;
613 }
614
615 offset += sizeof(struct gre_base_hdr);
616
617 if (hdr->flags & GRE_CSUM)
618 offset += sizeof_field(struct gre_full_hdr, csum) +
619 sizeof_field(struct gre_full_hdr, reserved1);
620
621 if (hdr->flags & GRE_KEY) {
622 const __be32 *keyid;
623 __be32 _keyid;
624
625 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
626 sizeof(_keyid),
627 data, *p_hlen, &_keyid);
628 if (!keyid)
629 return FLOW_DISSECT_RET_OUT_BAD;
630
631 if (dissector_uses_key(flow_dissector,
632 FLOW_DISSECTOR_KEY_GRE_KEYID)) {
633 key_keyid = skb_flow_dissector_target(flow_dissector,
634 FLOW_DISSECTOR_KEY_GRE_KEYID,
635 target_container);
636 if (gre_ver == 0)
637 key_keyid->keyid = *keyid;
638 else
639 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
640 }
641 offset += sizeof_field(struct gre_full_hdr, key);
642 }
643
644 if (hdr->flags & GRE_SEQ)
645 offset += sizeof_field(struct pptp_gre_header, seq);
646
647 if (gre_ver == 0) {
648 if (*p_proto == htons(ETH_P_TEB)) {
649 const struct ethhdr *eth;
650 struct ethhdr _eth;
651
652 eth = __skb_header_pointer(skb, *p_nhoff + offset,
653 sizeof(_eth),
654 data, *p_hlen, &_eth);
655 if (!eth)
656 return FLOW_DISSECT_RET_OUT_BAD;
657 *p_proto = eth->h_proto;
658 offset += sizeof(*eth);
659
660 /* Cap headers that we access via pointers at the
661 * end of the Ethernet header as our maximum alignment
662 * at that point is only 2 bytes.
663 */
664 if (NET_IP_ALIGN)
665 *p_hlen = *p_nhoff + offset;
666 }
667 } else { /* version 1, must be PPTP */
668 u8 _ppp_hdr[PPP_HDRLEN];
669 u8 *ppp_hdr;
670
671 if (hdr->flags & GRE_ACK)
672 offset += sizeof_field(struct pptp_gre_header, ack);
673
674 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
675 sizeof(_ppp_hdr),
676 data, *p_hlen, _ppp_hdr);
677 if (!ppp_hdr)
678 return FLOW_DISSECT_RET_OUT_BAD;
679
680 switch (PPP_PROTOCOL(ppp_hdr)) {
681 case PPP_IP:
682 *p_proto = htons(ETH_P_IP);
683 break;
684 case PPP_IPV6:
685 *p_proto = htons(ETH_P_IPV6);
686 break;
687 default:
688 /* Could probably catch some more like MPLS */
689 break;
690 }
691
692 offset += PPP_HDRLEN;
693 }
694
695 *p_nhoff += offset;
696 key_control->flags |= FLOW_DIS_ENCAPSULATION;
697 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
698 return FLOW_DISSECT_RET_OUT_GOOD;
699
700 return FLOW_DISSECT_RET_PROTO_AGAIN;
701 }
702
703 /**
704 * __skb_flow_dissect_batadv() - dissect batman-adv header
705 * @skb: sk_buff to with the batman-adv header
706 * @key_control: flow dissectors control key
707 * @data: raw buffer pointer to the packet, if NULL use skb->data
708 * @p_proto: pointer used to update the protocol to process next
709 * @p_nhoff: pointer used to update inner network header offset
710 * @hlen: packet header length
711 * @flags: any combination of FLOW_DISSECTOR_F_*
712 *
713 * ETH_P_BATMAN packets are tried to be dissected. Only
714 * &struct batadv_unicast packets are actually processed because they contain an
715 * inner ethernet header and are usually followed by actual network header. This
716 * allows the flow dissector to continue processing the packet.
717 *
718 * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
719 * FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
720 * otherwise FLOW_DISSECT_RET_OUT_BAD
721 */
722 static enum flow_dissect_ret
723 __skb_flow_dissect_batadv(const struct sk_buff *skb,
724 struct flow_dissector_key_control *key_control,
725 void *data, __be16 *p_proto, int *p_nhoff, int hlen,
726 unsigned int flags)
727 {
728 struct {
729 struct batadv_unicast_packet batadv_unicast;
730 struct ethhdr eth;
731 } *hdr, _hdr;
732
733 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
734 &_hdr);
735 if (!hdr)
736 return FLOW_DISSECT_RET_OUT_BAD;
737
738 if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
739 return FLOW_DISSECT_RET_OUT_BAD;
740
741 if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
742 return FLOW_DISSECT_RET_OUT_BAD;
743
744 *p_proto = hdr->eth.h_proto;
745 *p_nhoff += sizeof(*hdr);
746
747 key_control->flags |= FLOW_DIS_ENCAPSULATION;
748 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
749 return FLOW_DISSECT_RET_OUT_GOOD;
750
751 return FLOW_DISSECT_RET_PROTO_AGAIN;
752 }
753
754 static void
755 __skb_flow_dissect_tcp(const struct sk_buff *skb,
756 struct flow_dissector *flow_dissector,
757 void *target_container, void *data, int thoff, int hlen)
758 {
759 struct flow_dissector_key_tcp *key_tcp;
760 struct tcphdr *th, _th;
761
762 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
763 return;
764
765 th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
766 if (!th)
767 return;
768
769 if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
770 return;
771
772 key_tcp = skb_flow_dissector_target(flow_dissector,
773 FLOW_DISSECTOR_KEY_TCP,
774 target_container);
775 key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
776 }
777
778 static void
779 __skb_flow_dissect_ports(const struct sk_buff *skb,
780 struct flow_dissector *flow_dissector,
781 void *target_container, void *data, int nhoff,
782 u8 ip_proto, int hlen)
783 {
784 enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX;
785 struct flow_dissector_key_ports *key_ports;
786
787 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
788 dissector_ports = FLOW_DISSECTOR_KEY_PORTS;
789 else if (dissector_uses_key(flow_dissector,
790 FLOW_DISSECTOR_KEY_PORTS_RANGE))
791 dissector_ports = FLOW_DISSECTOR_KEY_PORTS_RANGE;
792
793 if (dissector_ports == FLOW_DISSECTOR_KEY_MAX)
794 return;
795
796 key_ports = skb_flow_dissector_target(flow_dissector,
797 dissector_ports,
798 target_container);
799 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
800 data, hlen);
801 }
802
803 static void
804 __skb_flow_dissect_ipv4(const struct sk_buff *skb,
805 struct flow_dissector *flow_dissector,
806 void *target_container, void *data, const struct iphdr *iph)
807 {
808 struct flow_dissector_key_ip *key_ip;
809
810 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
811 return;
812
813 key_ip = skb_flow_dissector_target(flow_dissector,
814 FLOW_DISSECTOR_KEY_IP,
815 target_container);
816 key_ip->tos = iph->tos;
817 key_ip->ttl = iph->ttl;
818 }
819
820 static void
821 __skb_flow_dissect_ipv6(const struct sk_buff *skb,
822 struct flow_dissector *flow_dissector,
823 void *target_container, void *data, const struct ipv6hdr *iph)
824 {
825 struct flow_dissector_key_ip *key_ip;
826
827 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
828 return;
829
830 key_ip = skb_flow_dissector_target(flow_dissector,
831 FLOW_DISSECTOR_KEY_IP,
832 target_container);
833 key_ip->tos = ipv6_get_dsfield(iph);
834 key_ip->ttl = iph->hop_limit;
835 }
836
837 /* Maximum number of protocol headers that can be parsed in
838 * __skb_flow_dissect
839 */
840 #define MAX_FLOW_DISSECT_HDRS 15
841
842 static bool skb_flow_dissect_allowed(int *num_hdrs)
843 {
844 ++*num_hdrs;
845
846 return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
847 }
848
849 static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
850 struct flow_dissector *flow_dissector,
851 void *target_container)
852 {
853 struct flow_dissector_key_ports *key_ports = NULL;
854 struct flow_dissector_key_control *key_control;
855 struct flow_dissector_key_basic *key_basic;
856 struct flow_dissector_key_addrs *key_addrs;
857 struct flow_dissector_key_tags *key_tags;
858
859 key_control = skb_flow_dissector_target(flow_dissector,
860 FLOW_DISSECTOR_KEY_CONTROL,
861 target_container);
862 key_control->thoff = flow_keys->thoff;
863 if (flow_keys->is_frag)
864 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
865 if (flow_keys->is_first_frag)
866 key_control->flags |= FLOW_DIS_FIRST_FRAG;
867 if (flow_keys->is_encap)
868 key_control->flags |= FLOW_DIS_ENCAPSULATION;
869
870 key_basic = skb_flow_dissector_target(flow_dissector,
871 FLOW_DISSECTOR_KEY_BASIC,
872 target_container);
873 key_basic->n_proto = flow_keys->n_proto;
874 key_basic->ip_proto = flow_keys->ip_proto;
875
876 if (flow_keys->addr_proto == ETH_P_IP &&
877 dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
878 key_addrs = skb_flow_dissector_target(flow_dissector,
879 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
880 target_container);
881 key_addrs->v4addrs.src = flow_keys->ipv4_src;
882 key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
883 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
884 } else if (flow_keys->addr_proto == ETH_P_IPV6 &&
885 dissector_uses_key(flow_dissector,
886 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
887 key_addrs = skb_flow_dissector_target(flow_dissector,
888 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
889 target_container);
890 memcpy(&key_addrs->v6addrs, &flow_keys->ipv6_src,
891 sizeof(key_addrs->v6addrs));
892 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
893 }
894
895 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
896 key_ports = skb_flow_dissector_target(flow_dissector,
897 FLOW_DISSECTOR_KEY_PORTS,
898 target_container);
899 else if (dissector_uses_key(flow_dissector,
900 FLOW_DISSECTOR_KEY_PORTS_RANGE))
901 key_ports = skb_flow_dissector_target(flow_dissector,
902 FLOW_DISSECTOR_KEY_PORTS_RANGE,
903 target_container);
904
905 if (key_ports) {
906 key_ports->src = flow_keys->sport;
907 key_ports->dst = flow_keys->dport;
908 }
909
910 if (dissector_uses_key(flow_dissector,
911 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
912 key_tags = skb_flow_dissector_target(flow_dissector,
913 FLOW_DISSECTOR_KEY_FLOW_LABEL,
914 target_container);
915 key_tags->flow_label = ntohl(flow_keys->flow_label);
916 }
917 }
918
919 bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
920 __be16 proto, int nhoff, int hlen, unsigned int flags)
921 {
922 struct bpf_flow_keys *flow_keys = ctx->flow_keys;
923 u32 result;
924
925 /* Pass parameters to the BPF program */
926 memset(flow_keys, 0, sizeof(*flow_keys));
927 flow_keys->n_proto = proto;
928 flow_keys->nhoff = nhoff;
929 flow_keys->thoff = flow_keys->nhoff;
930
931 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
932 (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
933 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
934 (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
935 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
936 (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
937 flow_keys->flags = flags;
938
939 preempt_disable();
940 result = BPF_PROG_RUN(prog, ctx);
941 preempt_enable();
942
943 flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
944 flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
945 flow_keys->nhoff, hlen);
946
947 return result == BPF_OK;
948 }
949
950 /**
951 * __skb_flow_dissect - extract the flow_keys struct and return it
952 * @net: associated network namespace, derived from @skb if NULL
953 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
954 * @flow_dissector: list of keys to dissect
955 * @target_container: target structure to put dissected values into
956 * @data: raw buffer pointer to the packet, if NULL use skb->data
957 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
958 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
959 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
960 * @flags: flags that control the dissection process, e.g.
961 * FLOW_DISSECTOR_F_STOP_AT_ENCAP.
962 *
963 * The function will try to retrieve individual keys into target specified
964 * by flow_dissector from either the skbuff or a raw buffer specified by the
965 * rest parameters.
966 *
967 * Caller must take care of zeroing target container memory.
968 */
969 bool __skb_flow_dissect(const struct net *net,
970 const struct sk_buff *skb,
971 struct flow_dissector *flow_dissector,
972 void *target_container,
973 void *data, __be16 proto, int nhoff, int hlen,
974 unsigned int flags)
975 {
976 struct flow_dissector_key_control *key_control;
977 struct flow_dissector_key_basic *key_basic;
978 struct flow_dissector_key_addrs *key_addrs;
979 struct flow_dissector_key_tags *key_tags;
980 struct flow_dissector_key_vlan *key_vlan;
981 struct bpf_prog *attached = NULL;
982 enum flow_dissect_ret fdret;
983 enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
984 int num_hdrs = 0;
985 u8 ip_proto = 0;
986 bool ret;
987
988 if (!data) {
989 data = skb->data;
990 proto = skb_vlan_tag_present(skb) ?
991 skb->vlan_proto : skb->protocol;
992 nhoff = skb_network_offset(skb);
993 hlen = skb_headlen(skb);
994 #if IS_ENABLED(CONFIG_NET_DSA)
995 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
996 proto == htons(ETH_P_XDSA))) {
997 const struct dsa_device_ops *ops;
998 int offset = 0;
999
1000 ops = skb->dev->dsa_ptr->tag_ops;
1001 if (ops->flow_dissect &&
1002 !ops->flow_dissect(skb, &proto, &offset)) {
1003 hlen -= offset;
1004 nhoff += offset;
1005 }
1006 }
1007 #endif
1008 }
1009
1010 /* It is ensured by skb_flow_dissector_init() that control key will
1011 * be always present.
1012 */
1013 key_control = skb_flow_dissector_target(flow_dissector,
1014 FLOW_DISSECTOR_KEY_CONTROL,
1015 target_container);
1016
1017 /* It is ensured by skb_flow_dissector_init() that basic key will
1018 * be always present.
1019 */
1020 key_basic = skb_flow_dissector_target(flow_dissector,
1021 FLOW_DISSECTOR_KEY_BASIC,
1022 target_container);
1023
1024 if (skb) {
1025 if (!net) {
1026 if (skb->dev)
1027 net = dev_net(skb->dev);
1028 else if (skb->sk)
1029 net = sock_net(skb->sk);
1030 }
1031 }
1032
1033 WARN_ON_ONCE(!net);
1034 if (net) {
1035 rcu_read_lock();
1036 attached = rcu_dereference(init_net.flow_dissector_prog);
1037
1038 if (!attached)
1039 attached = rcu_dereference(net->flow_dissector_prog);
1040
1041 if (attached) {
1042 struct bpf_flow_keys flow_keys;
1043 struct bpf_flow_dissector ctx = {
1044 .flow_keys = &flow_keys,
1045 .data = data,
1046 .data_end = data + hlen,
1047 };
1048 __be16 n_proto = proto;
1049
1050 if (skb) {
1051 ctx.skb = skb;
1052 /* we can't use 'proto' in the skb case
1053 * because it might be set to skb->vlan_proto
1054 * which has been pulled from the data
1055 */
1056 n_proto = skb->protocol;
1057 }
1058
1059 ret = bpf_flow_dissect(attached, &ctx, n_proto, nhoff,
1060 hlen, flags);
1061 __skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1062 target_container);
1063 rcu_read_unlock();
1064 return ret;
1065 }
1066 rcu_read_unlock();
1067 }
1068
1069 if (dissector_uses_key(flow_dissector,
1070 FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
1071 struct ethhdr *eth = eth_hdr(skb);
1072 struct flow_dissector_key_eth_addrs *key_eth_addrs;
1073
1074 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1075 FLOW_DISSECTOR_KEY_ETH_ADDRS,
1076 target_container);
1077 memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs));
1078 }
1079
1080 proto_again:
1081 fdret = FLOW_DISSECT_RET_CONTINUE;
1082
1083 switch (proto) {
1084 case htons(ETH_P_IP): {
1085 const struct iphdr *iph;
1086 struct iphdr _iph;
1087
1088 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1089 if (!iph || iph->ihl < 5) {
1090 fdret = FLOW_DISSECT_RET_OUT_BAD;
1091 break;
1092 }
1093
1094 nhoff += iph->ihl * 4;
1095
1096 ip_proto = iph->protocol;
1097
1098 if (dissector_uses_key(flow_dissector,
1099 FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1100 key_addrs = skb_flow_dissector_target(flow_dissector,
1101 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1102 target_container);
1103
1104 memcpy(&key_addrs->v4addrs, &iph->saddr,
1105 sizeof(key_addrs->v4addrs));
1106 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1107 }
1108
1109 if (ip_is_fragment(iph)) {
1110 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1111
1112 if (iph->frag_off & htons(IP_OFFSET)) {
1113 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1114 break;
1115 } else {
1116 key_control->flags |= FLOW_DIS_FIRST_FRAG;
1117 if (!(flags &
1118 FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1119 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1120 break;
1121 }
1122 }
1123 }
1124
1125 __skb_flow_dissect_ipv4(skb, flow_dissector,
1126 target_container, data, iph);
1127
1128 break;
1129 }
1130 case htons(ETH_P_IPV6): {
1131 const struct ipv6hdr *iph;
1132 struct ipv6hdr _iph;
1133
1134 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
1135 if (!iph) {
1136 fdret = FLOW_DISSECT_RET_OUT_BAD;
1137 break;
1138 }
1139
1140 ip_proto = iph->nexthdr;
1141 nhoff += sizeof(struct ipv6hdr);
1142
1143 if (dissector_uses_key(flow_dissector,
1144 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
1145 key_addrs = skb_flow_dissector_target(flow_dissector,
1146 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1147 target_container);
1148
1149 memcpy(&key_addrs->v6addrs, &iph->saddr,
1150 sizeof(key_addrs->v6addrs));
1151 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1152 }
1153
1154 if ((dissector_uses_key(flow_dissector,
1155 FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1156 (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1157 ip6_flowlabel(iph)) {
1158 __be32 flow_label = ip6_flowlabel(iph);
1159
1160 if (dissector_uses_key(flow_dissector,
1161 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
1162 key_tags = skb_flow_dissector_target(flow_dissector,
1163 FLOW_DISSECTOR_KEY_FLOW_LABEL,
1164 target_container);
1165 key_tags->flow_label = ntohl(flow_label);
1166 }
1167 if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1168 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1169 break;
1170 }
1171 }
1172
1173 __skb_flow_dissect_ipv6(skb, flow_dissector,
1174 target_container, data, iph);
1175
1176 break;
1177 }
1178 case htons(ETH_P_8021AD):
1179 case htons(ETH_P_8021Q): {
1180 const struct vlan_hdr *vlan = NULL;
1181 struct vlan_hdr _vlan;
1182 __be16 saved_vlan_tpid = proto;
1183
1184 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1185 skb && skb_vlan_tag_present(skb)) {
1186 proto = skb->protocol;
1187 } else {
1188 vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1189 data, hlen, &_vlan);
1190 if (!vlan) {
1191 fdret = FLOW_DISSECT_RET_OUT_BAD;
1192 break;
1193 }
1194
1195 proto = vlan->h_vlan_encapsulated_proto;
1196 nhoff += sizeof(*vlan);
1197 }
1198
1199 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1200 dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1201 } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1202 dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1203 } else {
1204 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1205 break;
1206 }
1207
1208 if (dissector_uses_key(flow_dissector, dissector_vlan)) {
1209 key_vlan = skb_flow_dissector_target(flow_dissector,
1210 dissector_vlan,
1211 target_container);
1212
1213 if (!vlan) {
1214 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
1215 key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
1216 } else {
1217 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
1218 VLAN_VID_MASK;
1219 key_vlan->vlan_priority =
1220 (ntohs(vlan->h_vlan_TCI) &
1221 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1222 }
1223 key_vlan->vlan_tpid = saved_vlan_tpid;
1224 }
1225
1226 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1227 break;
1228 }
1229 case htons(ETH_P_PPP_SES): {
1230 struct {
1231 struct pppoe_hdr hdr;
1232 __be16 proto;
1233 } *hdr, _hdr;
1234 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
1235 if (!hdr) {
1236 fdret = FLOW_DISSECT_RET_OUT_BAD;
1237 break;
1238 }
1239
1240 proto = hdr->proto;
1241 nhoff += PPPOE_SES_HLEN;
1242 switch (proto) {
1243 case htons(PPP_IP):
1244 proto = htons(ETH_P_IP);
1245 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1246 break;
1247 case htons(PPP_IPV6):
1248 proto = htons(ETH_P_IPV6);
1249 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1250 break;
1251 default:
1252 fdret = FLOW_DISSECT_RET_OUT_BAD;
1253 break;
1254 }
1255 break;
1256 }
1257 case htons(ETH_P_TIPC): {
1258 struct tipc_basic_hdr *hdr, _hdr;
1259
1260 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1261 data, hlen, &_hdr);
1262 if (!hdr) {
1263 fdret = FLOW_DISSECT_RET_OUT_BAD;
1264 break;
1265 }
1266
1267 if (dissector_uses_key(flow_dissector,
1268 FLOW_DISSECTOR_KEY_TIPC)) {
1269 key_addrs = skb_flow_dissector_target(flow_dissector,
1270 FLOW_DISSECTOR_KEY_TIPC,
1271 target_container);
1272 key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1273 key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
1274 }
1275 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1276 break;
1277 }
1278
1279 case htons(ETH_P_MPLS_UC):
1280 case htons(ETH_P_MPLS_MC):
1281 fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
1282 target_container, data,
1283 nhoff, hlen);
1284 break;
1285 case htons(ETH_P_FCOE):
1286 if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1287 fdret = FLOW_DISSECT_RET_OUT_BAD;
1288 break;
1289 }
1290
1291 nhoff += FCOE_HEADER_LEN;
1292 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1293 break;
1294
1295 case htons(ETH_P_ARP):
1296 case htons(ETH_P_RARP):
1297 fdret = __skb_flow_dissect_arp(skb, flow_dissector,
1298 target_container, data,
1299 nhoff, hlen);
1300 break;
1301
1302 case htons(ETH_P_BATMAN):
1303 fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1304 &proto, &nhoff, hlen, flags);
1305 break;
1306
1307 default:
1308 fdret = FLOW_DISSECT_RET_OUT_BAD;
1309 break;
1310 }
1311
1312 /* Process result of proto processing */
1313 switch (fdret) {
1314 case FLOW_DISSECT_RET_OUT_GOOD:
1315 goto out_good;
1316 case FLOW_DISSECT_RET_PROTO_AGAIN:
1317 if (skb_flow_dissect_allowed(&num_hdrs))
1318 goto proto_again;
1319 goto out_good;
1320 case FLOW_DISSECT_RET_CONTINUE:
1321 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1322 break;
1323 case FLOW_DISSECT_RET_OUT_BAD:
1324 default:
1325 goto out_bad;
1326 }
1327
1328 ip_proto_again:
1329 fdret = FLOW_DISSECT_RET_CONTINUE;
1330
1331 switch (ip_proto) {
1332 case IPPROTO_GRE:
1333 fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
1334 target_container, data,
1335 &proto, &nhoff, &hlen, flags);
1336 break;
1337
1338 case NEXTHDR_HOP:
1339 case NEXTHDR_ROUTING:
1340 case NEXTHDR_DEST: {
1341 u8 _opthdr[2], *opthdr;
1342
1343 if (proto != htons(ETH_P_IPV6))
1344 break;
1345
1346 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1347 data, hlen, &_opthdr);
1348 if (!opthdr) {
1349 fdret = FLOW_DISSECT_RET_OUT_BAD;
1350 break;
1351 }
1352
1353 ip_proto = opthdr[0];
1354 nhoff += (opthdr[1] + 1) << 3;
1355
1356 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1357 break;
1358 }
1359 case NEXTHDR_FRAGMENT: {
1360 struct frag_hdr _fh, *fh;
1361
1362 if (proto != htons(ETH_P_IPV6))
1363 break;
1364
1365 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1366 data, hlen, &_fh);
1367
1368 if (!fh) {
1369 fdret = FLOW_DISSECT_RET_OUT_BAD;
1370 break;
1371 }
1372
1373 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
1374
1375 nhoff += sizeof(_fh);
1376 ip_proto = fh->nexthdr;
1377
1378 if (!(fh->frag_off & htons(IP6_OFFSET))) {
1379 key_control->flags |= FLOW_DIS_FIRST_FRAG;
1380 if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1381 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1382 break;
1383 }
1384 }
1385
1386 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1387 break;
1388 }
1389 case IPPROTO_IPIP:
1390 proto = htons(ETH_P_IP);
1391
1392 key_control->flags |= FLOW_DIS_ENCAPSULATION;
1393 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1394 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1395 break;
1396 }
1397
1398 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1399 break;
1400
1401 case IPPROTO_IPV6:
1402 proto = htons(ETH_P_IPV6);
1403
1404 key_control->flags |= FLOW_DIS_ENCAPSULATION;
1405 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1406 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1407 break;
1408 }
1409
1410 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1411 break;
1412
1413
1414 case IPPROTO_MPLS:
1415 proto = htons(ETH_P_MPLS_UC);
1416 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1417 break;
1418
1419 case IPPROTO_TCP:
1420 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1421 data, nhoff, hlen);
1422 break;
1423
1424 case IPPROTO_ICMP:
1425 case IPPROTO_ICMPV6:
1426 __skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1427 data, nhoff, hlen);
1428 break;
1429
1430 default:
1431 break;
1432 }
1433
1434 if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT))
1435 __skb_flow_dissect_ports(skb, flow_dissector, target_container,
1436 data, nhoff, ip_proto, hlen);
1437
1438 /* Process result of IP proto processing */
1439 switch (fdret) {
1440 case FLOW_DISSECT_RET_PROTO_AGAIN:
1441 if (skb_flow_dissect_allowed(&num_hdrs))
1442 goto proto_again;
1443 break;
1444 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1445 if (skb_flow_dissect_allowed(&num_hdrs))
1446 goto ip_proto_again;
1447 break;
1448 case FLOW_DISSECT_RET_OUT_GOOD:
1449 case FLOW_DISSECT_RET_CONTINUE:
1450 break;
1451 case FLOW_DISSECT_RET_OUT_BAD:
1452 default:
1453 goto out_bad;
1454 }
1455
1456 out_good:
1457 ret = true;
1458
1459 out:
1460 key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
1461 key_basic->n_proto = proto;
1462 key_basic->ip_proto = ip_proto;
1463
1464 return ret;
1465
1466 out_bad:
1467 ret = false;
1468 goto out;
1469 }
1470 EXPORT_SYMBOL(__skb_flow_dissect);
1471
1472 static siphash_key_t hashrnd __read_mostly;
1473 static __always_inline void __flow_hash_secret_init(void)
1474 {
1475 net_get_random_once(&hashrnd, sizeof(hashrnd));
1476 }
1477
1478 static const void *flow_keys_hash_start(const struct flow_keys *flow)
1479 {
1480 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1481 return &flow->FLOW_KEYS_HASH_START_FIELD;
1482 }
1483
1484 static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
1485 {
1486 size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
1487
1488 BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
1489
1490 switch (flow->control.addr_type) {
1491 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1492 diff -= sizeof(flow->addrs.v4addrs);
1493 break;
1494 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1495 diff -= sizeof(flow->addrs.v6addrs);
1496 break;
1497 case FLOW_DISSECTOR_KEY_TIPC:
1498 diff -= sizeof(flow->addrs.tipckey);
1499 break;
1500 }
1501 return sizeof(*flow) - diff;
1502 }
1503
1504 __be32 flow_get_u32_src(const struct flow_keys *flow)
1505 {
1506 switch (flow->control.addr_type) {
1507 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1508 return flow->addrs.v4addrs.src;
1509 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1510 return (__force __be32)ipv6_addr_hash(
1511 &flow->addrs.v6addrs.src);
1512 case FLOW_DISSECTOR_KEY_TIPC:
1513 return flow->addrs.tipckey.key;
1514 default:
1515 return 0;
1516 }
1517 }
1518 EXPORT_SYMBOL(flow_get_u32_src);
1519
1520 __be32 flow_get_u32_dst(const struct flow_keys *flow)
1521 {
1522 switch (flow->control.addr_type) {
1523 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1524 return flow->addrs.v4addrs.dst;
1525 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1526 return (__force __be32)ipv6_addr_hash(
1527 &flow->addrs.v6addrs.dst);
1528 default:
1529 return 0;
1530 }
1531 }
1532 EXPORT_SYMBOL(flow_get_u32_dst);
1533
1534 /* Sort the source and destination IP (and the ports if the IP are the same),
1535 * to have consistent hash within the two directions
1536 */
1537 static inline void __flow_hash_consistentify(struct flow_keys *keys)
1538 {
1539 int addr_diff, i;
1540
1541 switch (keys->control.addr_type) {
1542 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1543 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
1544 (__force u32)keys->addrs.v4addrs.src;
1545 if ((addr_diff < 0) ||
1546 (addr_diff == 0 &&
1547 ((__force u16)keys->ports.dst <
1548 (__force u16)keys->ports.src))) {
1549 swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1550 swap(keys->ports.src, keys->ports.dst);
1551 }
1552 break;
1553 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1554 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1555 &keys->addrs.v6addrs.src,
1556 sizeof(keys->addrs.v6addrs.dst));
1557 if ((addr_diff < 0) ||
1558 (addr_diff == 0 &&
1559 ((__force u16)keys->ports.dst <
1560 (__force u16)keys->ports.src))) {
1561 for (i = 0; i < 4; i++)
1562 swap(keys->addrs.v6addrs.src.s6_addr32[i],
1563 keys->addrs.v6addrs.dst.s6_addr32[i]);
1564 swap(keys->ports.src, keys->ports.dst);
1565 }
1566 break;
1567 }
1568 }
1569
1570 static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1571 const siphash_key_t *keyval)
1572 {
1573 u32 hash;
1574
1575 __flow_hash_consistentify(keys);
1576
1577 hash = siphash(flow_keys_hash_start(keys),
1578 flow_keys_hash_length(keys), keyval);
1579 if (!hash)
1580 hash = 1;
1581
1582 return hash;
1583 }
1584
1585 u32 flow_hash_from_keys(struct flow_keys *keys)
1586 {
1587 __flow_hash_secret_init();
1588 return __flow_hash_from_keys(keys, &hashrnd);
1589 }
1590 EXPORT_SYMBOL(flow_hash_from_keys);
1591
1592 static inline u32 ___skb_get_hash(const struct sk_buff *skb,
1593 struct flow_keys *keys,
1594 const siphash_key_t *keyval)
1595 {
1596 skb_flow_dissect_flow_keys(skb, keys,
1597 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1598
1599 return __flow_hash_from_keys(keys, keyval);
1600 }
1601
1602 struct _flow_keys_digest_data {
1603 __be16 n_proto;
1604 u8 ip_proto;
1605 u8 padding;
1606 __be32 ports;
1607 __be32 src;
1608 __be32 dst;
1609 };
1610
1611 void make_flow_keys_digest(struct flow_keys_digest *digest,
1612 const struct flow_keys *flow)
1613 {
1614 struct _flow_keys_digest_data *data =
1615 (struct _flow_keys_digest_data *)digest;
1616
1617 BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1618
1619 memset(digest, 0, sizeof(*digest));
1620
1621 data->n_proto = flow->basic.n_proto;
1622 data->ip_proto = flow->basic.ip_proto;
1623 data->ports = flow->ports.ports;
1624 data->src = flow->addrs.v4addrs.src;
1625 data->dst = flow->addrs.v4addrs.dst;
1626 }
1627 EXPORT_SYMBOL(make_flow_keys_digest);
1628
1629 static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1630
1631 u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
1632 {
1633 struct flow_keys keys;
1634
1635 __flow_hash_secret_init();
1636
1637 memset(&keys, 0, sizeof(keys));
1638 __skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1639 &keys, NULL, 0, 0, 0,
1640 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1641
1642 return __flow_hash_from_keys(&keys, &hashrnd);
1643 }
1644 EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1645
1646 /**
1647 * __skb_get_hash: calculate a flow hash
1648 * @skb: sk_buff to calculate flow hash from
1649 *
1650 * This function calculates a flow hash based on src/dst addresses
1651 * and src/dst port numbers. Sets hash in skb to non-zero hash value
1652 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
1653 * if hash is a canonical 4-tuple hash over transport ports.
1654 */
1655 void __skb_get_hash(struct sk_buff *skb)
1656 {
1657 struct flow_keys keys;
1658 u32 hash;
1659
1660 __flow_hash_secret_init();
1661
1662 hash = ___skb_get_hash(skb, &keys, &hashrnd);
1663
1664 __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
1665 }
1666 EXPORT_SYMBOL(__skb_get_hash);
1667
1668 __u32 skb_get_hash_perturb(const struct sk_buff *skb,
1669 const siphash_key_t *perturb)
1670 {
1671 struct flow_keys keys;
1672
1673 return ___skb_get_hash(skb, &keys, perturb);
1674 }
1675 EXPORT_SYMBOL(skb_get_hash_perturb);
1676
1677 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
1678 const struct flow_keys_basic *keys, int hlen)
1679 {
1680 u32 poff = keys->control.thoff;
1681
1682 /* skip L4 headers for fragments after the first */
1683 if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1684 !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1685 return poff;
1686
1687 switch (keys->basic.ip_proto) {
1688 case IPPROTO_TCP: {
1689 /* access doff as u8 to avoid unaligned access */
1690 const u8 *doff;
1691 u8 _doff;
1692
1693 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1694 data, hlen, &_doff);
1695 if (!doff)
1696 return poff;
1697
1698 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
1699 break;
1700 }
1701 case IPPROTO_UDP:
1702 case IPPROTO_UDPLITE:
1703 poff += sizeof(struct udphdr);
1704 break;
1705 /* For the rest, we do not really care about header
1706 * extensions at this point for now.
1707 */
1708 case IPPROTO_ICMP:
1709 poff += sizeof(struct icmphdr);
1710 break;
1711 case IPPROTO_ICMPV6:
1712 poff += sizeof(struct icmp6hdr);
1713 break;
1714 case IPPROTO_IGMP:
1715 poff += sizeof(struct igmphdr);
1716 break;
1717 case IPPROTO_DCCP:
1718 poff += sizeof(struct dccp_hdr);
1719 break;
1720 case IPPROTO_SCTP:
1721 poff += sizeof(struct sctphdr);
1722 break;
1723 }
1724
1725 return poff;
1726 }
1727
1728 /**
1729 * skb_get_poff - get the offset to the payload
1730 * @skb: sk_buff to get the payload offset from
1731 *
1732 * The function will get the offset to the payload as far as it could
1733 * be dissected. The main user is currently BPF, so that we can dynamically
1734 * truncate packets without needing to push actual payload to the user
1735 * space and can analyze headers only, instead.
1736 */
1737 u32 skb_get_poff(const struct sk_buff *skb)
1738 {
1739 struct flow_keys_basic keys;
1740
1741 if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1742 NULL, 0, 0, 0, 0))
1743 return 0;
1744
1745 return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1746 }
1747
1748 __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
1749 {
1750 memset(keys, 0, sizeof(*keys));
1751
1752 memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1753 sizeof(keys->addrs.v6addrs.src));
1754 memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1755 sizeof(keys->addrs.v6addrs.dst));
1756 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1757 keys->ports.src = fl6->fl6_sport;
1758 keys->ports.dst = fl6->fl6_dport;
1759 keys->keyid.keyid = fl6->fl6_gre_key;
1760 keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
1761 keys->basic.ip_proto = fl6->flowi6_proto;
1762
1763 return flow_hash_from_keys(keys);
1764 }
1765 EXPORT_SYMBOL(__get_hash_from_flowi6);
1766
1767 static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1768 {
1769 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1770 .offset = offsetof(struct flow_keys, control),
1771 },
1772 {
1773 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1774 .offset = offsetof(struct flow_keys, basic),
1775 },
1776 {
1777 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1778 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1779 },
1780 {
1781 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1782 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1783 },
1784 {
1785 .key_id = FLOW_DISSECTOR_KEY_TIPC,
1786 .offset = offsetof(struct flow_keys, addrs.tipckey),
1787 },
1788 {
1789 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1790 .offset = offsetof(struct flow_keys, ports),
1791 },
1792 {
1793 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1794 .offset = offsetof(struct flow_keys, vlan),
1795 },
1796 {
1797 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1798 .offset = offsetof(struct flow_keys, tags),
1799 },
1800 {
1801 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1802 .offset = offsetof(struct flow_keys, keyid),
1803 },
1804 };
1805
1806 static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1807 {
1808 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1809 .offset = offsetof(struct flow_keys, control),
1810 },
1811 {
1812 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1813 .offset = offsetof(struct flow_keys, basic),
1814 },
1815 {
1816 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1817 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1818 },
1819 {
1820 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1821 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1822 },
1823 {
1824 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1825 .offset = offsetof(struct flow_keys, ports),
1826 },
1827 };
1828
1829 static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
1830 {
1831 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1832 .offset = offsetof(struct flow_keys, control),
1833 },
1834 {
1835 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1836 .offset = offsetof(struct flow_keys, basic),
1837 },
1838 };
1839
1840 struct flow_dissector flow_keys_dissector __read_mostly;
1841 EXPORT_SYMBOL(flow_keys_dissector);
1842
1843 struct flow_dissector flow_keys_basic_dissector __read_mostly;
1844 EXPORT_SYMBOL(flow_keys_basic_dissector);
1845
1846 static int __init init_default_flow_dissectors(void)
1847 {
1848 skb_flow_dissector_init(&flow_keys_dissector,
1849 flow_keys_dissector_keys,
1850 ARRAY_SIZE(flow_keys_dissector_keys));
1851 skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1852 flow_keys_dissector_symmetric_keys,
1853 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
1854 skb_flow_dissector_init(&flow_keys_basic_dissector,
1855 flow_keys_basic_dissector_keys,
1856 ARRAY_SIZE(flow_keys_basic_dissector_keys));
1857
1858 return register_pernet_subsys(&flow_dissector_pernet_ops);
1859 }
1860 core_initcall(init_default_flow_dissectors);
1861
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