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ASoC: SOF: Drop superfluous snd_pcm_sgbuf_ops_page
[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>
43e66528 8#include <net/dsa.h>
a38402bc 9#include <net/dst_metadata.h>
0744dd00 10#include <net/ip.h>
ddbe5032 11#include <net/ipv6.h>
ab10dccb
GF		 12#include <net/gre.h>
13#include <net/pptp.h>
8d6e79d3 14#include <net/tipc.h>
f77668dc
DB		 15#include <linux/igmp.h>
16#include <linux/icmp.h>
17#include <linux/sctp.h>
18#include <linux/dccp.h>
0744dd00
ED		 19#include <linux/if_tunnel.h>
20#include <linux/if_pppox.h>
21#include <linux/ppp_defs.h>
06635a35 22#include <linux/stddef.h>
67a900cc 23#include <linux/if_ether.h>
b3baa0fb 24#include <linux/mpls.h>
ac4bb5de 25#include <linux/tcp.h>
1bd758eb 26#include <net/flow_dissector.h>
56193d1b 27#include <scsi/fc/fc_fcoe.h>
5b0890a9 28#include <uapi/linux/batadv_packet.h>
d58e468b 29#include <linux/bpf.h>
75a56758
PB		 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
d58e468b
PP		 34
35static DEFINE_MUTEX(flow_dissector_mutex);
0744dd00 36
20a17bf6
DM		 37static void dissector_set_key(struct flow_dissector *flow_dissector,
38 enum flow_dissector_key_id key_id)
fbff949e
JP		 39{
40 flow_dissector->used_keys |= (1 << key_id);
41}
42
fbff949e
JP		 43void 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);
20a17bf6
DM		 56 BUG_ON(dissector_uses_key(flow_dissector,
57 key->key_id));
fbff949e 58
20a17bf6 59 dissector_set_key(flow_dissector, key->key_id);
fbff949e
JP		 60 flow_dissector->offset[key->key_id] = key->offset;
61 }
62
42aecaa9
TH		 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.
fbff949e 65 */
20a17bf6
DM		 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));
fbff949e
JP		 70}
71EXPORT_SYMBOL(skb_flow_dissector_init);
72
118c8e9a
SF		 73int 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
d58e468b
PP		 112int 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
118 net = current->nsproxy->net_ns;
119 mutex_lock(&flow_dissector_mutex);
120 attached = rcu_dereference_protected(net->flow_dissector_prog,
121 lockdep_is_held(&flow_dissector_mutex));
122 if (attached) {
123 /* Only one BPF program can be attached at a time */
124 mutex_unlock(&flow_dissector_mutex);
125 return -EEXIST;
126 }
127 rcu_assign_pointer(net->flow_dissector_prog, prog);
128 mutex_unlock(&flow_dissector_mutex);
129 return 0;
130}
131
132int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr)
133{
134 struct bpf_prog *attached;
135 struct net *net;
136
137 net = current->nsproxy->net_ns;
138 mutex_lock(&flow_dissector_mutex);
139 attached = rcu_dereference_protected(net->flow_dissector_prog,
140 lockdep_is_held(&flow_dissector_mutex));
141 if (!attached) {
142 mutex_unlock(&flow_dissector_mutex);
143 return -ENOENT;
144 }
d58e468b 145 RCU_INIT_POINTER(net->flow_dissector_prog, NULL);
db38de39 146 bpf_prog_put(attached);
d58e468b
PP		 147 mutex_unlock(&flow_dissector_mutex);
148 return 0;
149}
972d3876
SH		 150/**
151 * skb_flow_get_be16 - extract be16 entity
152 * @skb: sk_buff to extract from
153 * @poff: offset to extract at
154 * @data: raw buffer pointer to the packet
155 * @hlen: packet header length
156 *
157 * The function will try to retrieve a be32 entity at
158 * offset poff
159 */
d9584d8c
ED		 160static __be16 skb_flow_get_be16(const struct sk_buff *skb, int poff,
161 void *data, int hlen)
972d3876
SH		 162{
163 __be16 *u, _u;
164
165 u = __skb_header_pointer(skb, poff, sizeof(_u), data, hlen, &_u);
166 if (u)
167 return *u;
168
169 return 0;
170}
171
357afe9c 172/**
6451b3f5
WC		 173 * __skb_flow_get_ports - extract the upper layer ports and return them
174 * @skb: sk_buff to extract the ports from
357afe9c
NA		 175 * @thoff: transport header offset
176 * @ip_proto: protocol for which to get port offset
6451b3f5
WC		 177 * @data: raw buffer pointer to the packet, if NULL use skb->data
178 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
357afe9c
NA		 179 *
180 * The function will try to retrieve the ports at offset thoff + poff where poff
181 * is the protocol port offset returned from proto_ports_offset
182 */
690e36e7
DM		 183__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
184 void *data, int hlen)
357afe9c
NA		 185{
186 int poff = proto_ports_offset(ip_proto);
187
690e36e7
DM		 188 if (!data) {
189 data = skb->data;
190 hlen = skb_headlen(skb);
191 }
192
357afe9c
NA		 193 if (poff >= 0) {
194 __be32 *ports, _ports;
195
690e36e7
DM		 196 ports = __skb_header_pointer(skb, thoff + poff,
197 sizeof(_ports), data, hlen, &_ports);
357afe9c
NA		 198 if (ports)
199 return *ports;
200 }
201
202 return 0;
203}
690e36e7 204EXPORT_SYMBOL(__skb_flow_get_ports);
357afe9c 205
82828b88
JP		 206void skb_flow_dissect_meta(const struct sk_buff *skb,
207 struct flow_dissector *flow_dissector,
208 void *target_container)
209{
210 struct flow_dissector_key_meta *meta;
211
212 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
213 return;
214
215 meta = skb_flow_dissector_target(flow_dissector,
216 FLOW_DISSECTOR_KEY_META,
217 target_container);
218 meta->ingress_ifindex = skb->skb_iif;
219}
220EXPORT_SYMBOL(skb_flow_dissect_meta);
221
a38402bc
SH		 222static void
223skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
224 struct flow_dissector *flow_dissector,
225 void *target_container)
226{
227 struct flow_dissector_key_control *ctrl;
228
229 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
230 return;
231
232 ctrl = skb_flow_dissector_target(flow_dissector,
233 FLOW_DISSECTOR_KEY_ENC_CONTROL,
234 target_container);
235 ctrl->addr_type = type;
236}
237
75a56758
PB		 238void
239skb_flow_dissect_ct(const struct sk_buff *skb,
240 struct flow_dissector *flow_dissector,
241 void *target_container,
242 u16 *ctinfo_map,
243 size_t mapsize)
244{
245#if IS_ENABLED(CONFIG_NF_CONNTRACK)
246 struct flow_dissector_key_ct *key;
247 enum ip_conntrack_info ctinfo;
248 struct nf_conn_labels *cl;
249 struct nf_conn *ct;
250
251 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
252 return;
253
254 ct = nf_ct_get(skb, &ctinfo);
255 if (!ct)
256 return;
257
258 key = skb_flow_dissector_target(flow_dissector,
259 FLOW_DISSECTOR_KEY_CT,
260 target_container);
261
262 if (ctinfo < mapsize)
263 key->ct_state = ctinfo_map[ctinfo];
264#if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
265 key->ct_zone = ct->zone.id;
266#endif
267#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
268 key->ct_mark = ct->mark;
269#endif
270
271 cl = nf_ct_labels_find(ct);
272 if (cl)
273 memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
274#endif /* CONFIG_NF_CONNTRACK */
275}
276EXPORT_SYMBOL(skb_flow_dissect_ct);
277
62b32379
SH		 278void
279skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
280 struct flow_dissector *flow_dissector,
281 void *target_container)
a38402bc
SH		 282{
283 struct ip_tunnel_info *info;
284 struct ip_tunnel_key *key;
285
286 /* A quick check to see if there might be something to do. */
287 if (!dissector_uses_key(flow_dissector,
288 FLOW_DISSECTOR_KEY_ENC_KEYID) &&
289 !dissector_uses_key(flow_dissector,
290 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
291 !dissector_uses_key(flow_dissector,
292 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
293 !dissector_uses_key(flow_dissector,
294 FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
295 !dissector_uses_key(flow_dissector,
5544adb9
OG		 296 FLOW_DISSECTOR_KEY_ENC_PORTS) &&
297 !dissector_uses_key(flow_dissector,
92e2c405
SH		 298 FLOW_DISSECTOR_KEY_ENC_IP) &&
299 !dissector_uses_key(flow_dissector,
300 FLOW_DISSECTOR_KEY_ENC_OPTS))
a38402bc
SH		 301 return;
302
303 info = skb_tunnel_info(skb);
304 if (!info)
305 return;
306
307 key = &info->key;
308
309 switch (ip_tunnel_info_af(info)) {
310 case AF_INET:
311 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
312 flow_dissector,
313 target_container);
314 if (dissector_uses_key(flow_dissector,
315 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
316 struct flow_dissector_key_ipv4_addrs *ipv4;
317
318 ipv4 = skb_flow_dissector_target(flow_dissector,
319 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
320 target_container);
321 ipv4->src = key->u.ipv4.src;
322 ipv4->dst = key->u.ipv4.dst;
323 }
324 break;
325 case AF_INET6:
326 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
327 flow_dissector,
328 target_container);
329 if (dissector_uses_key(flow_dissector,
330 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
331 struct flow_dissector_key_ipv6_addrs *ipv6;
332
333 ipv6 = skb_flow_dissector_target(flow_dissector,
334 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
335 target_container);
336 ipv6->src = key->u.ipv6.src;
337 ipv6->dst = key->u.ipv6.dst;
338 }
339 break;
340 }
341
342 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
343 struct flow_dissector_key_keyid *keyid;
344
345 keyid = skb_flow_dissector_target(flow_dissector,
346 FLOW_DISSECTOR_KEY_ENC_KEYID,
347 target_container);
348 keyid->keyid = tunnel_id_to_key32(key->tun_id);
349 }
350
351 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
352 struct flow_dissector_key_ports *tp;
353
354 tp = skb_flow_dissector_target(flow_dissector,
355 FLOW_DISSECTOR_KEY_ENC_PORTS,
356 target_container);
357 tp->src = key->tp_src;
358 tp->dst = key->tp_dst;
359 }
5544adb9
OG		 360
361 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
362 struct flow_dissector_key_ip *ip;
363
364 ip = skb_flow_dissector_target(flow_dissector,
365 FLOW_DISSECTOR_KEY_ENC_IP,
366 target_container);
367 ip->tos = key->tos;
368 ip->ttl = key->ttl;
369 }
92e2c405
SH		 370
371 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
372 struct flow_dissector_key_enc_opts *enc_opt;
373
374 enc_opt = skb_flow_dissector_target(flow_dissector,
375 FLOW_DISSECTOR_KEY_ENC_OPTS,
376 target_container);
377
378 if (info->options_len) {
379 enc_opt->len = info->options_len;
380 ip_tunnel_info_opts_get(enc_opt->data, info);
381 enc_opt->dst_opt_type = info->key.tun_flags &
382 TUNNEL_OPTIONS_PRESENT;
383 }
384 }
a38402bc 385}
62b32379 386EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
a38402bc 387
4a5d6c8b
JP		 388static enum flow_dissect_ret
389__skb_flow_dissect_mpls(const struct sk_buff *skb,
390 struct flow_dissector *flow_dissector,
391 void *target_container, void *data, int nhoff, int hlen)
392{
393 struct flow_dissector_key_keyid *key_keyid;
394 struct mpls_label *hdr, _hdr[2];
029c1ecb 395 u32 entry, label;
4a5d6c8b
JP		 396
397 if (!dissector_uses_key(flow_dissector,
029c1ecb
BL		 398 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
399 !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
4a5d6c8b
JP		 400 return FLOW_DISSECT_RET_OUT_GOOD;
401
402 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
403 hlen, &_hdr);
404 if (!hdr)
405 return FLOW_DISSECT_RET_OUT_BAD;
406
029c1ecb
BL		 407 entry = ntohl(hdr[0].entry);
408 label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
409
410 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
411 struct flow_dissector_key_mpls *key_mpls;
412
413 key_mpls = skb_flow_dissector_target(flow_dissector,
414 FLOW_DISSECTOR_KEY_MPLS,
415 target_container);
416 key_mpls->mpls_label = label;
417 key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK)
418 >> MPLS_LS_TTL_SHIFT;
419 key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK)
420 >> MPLS_LS_TC_SHIFT;
421 key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK)
422 >> MPLS_LS_S_SHIFT;
423 }
424
425 if (label == MPLS_LABEL_ENTROPY) {
4a5d6c8b
JP		 426 key_keyid = skb_flow_dissector_target(flow_dissector,
427 FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
428 target_container);
429 key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK);
430 }
431 return FLOW_DISSECT_RET_OUT_GOOD;
432}
433
9bf881ff
JP		 434static enum flow_dissect_ret
435__skb_flow_dissect_arp(const struct sk_buff *skb,
436 struct flow_dissector *flow_dissector,
437 void *target_container, void *data, int nhoff, int hlen)
438{
439 struct flow_dissector_key_arp *key_arp;
440 struct {
441 unsigned char ar_sha[ETH_ALEN];
442 unsigned char ar_sip[4];
443 unsigned char ar_tha[ETH_ALEN];
444 unsigned char ar_tip[4];
445 } *arp_eth, _arp_eth;
446 const struct arphdr *arp;
6f14f443 447 struct arphdr _arp;
9bf881ff
JP		 448
449 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
450 return FLOW_DISSECT_RET_OUT_GOOD;
451
452 arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
453 hlen, &_arp);
454 if (!arp)
455 return FLOW_DISSECT_RET_OUT_BAD;
456
457 if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
458 arp->ar_pro != htons(ETH_P_IP) ||
459 arp->ar_hln != ETH_ALEN ||
460 arp->ar_pln != 4 ||
461 (arp->ar_op != htons(ARPOP_REPLY) &&
462 arp->ar_op != htons(ARPOP_REQUEST)))
463 return FLOW_DISSECT_RET_OUT_BAD;
464
465 arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
466 sizeof(_arp_eth), data,
467 hlen, &_arp_eth);
468 if (!arp_eth)
469 return FLOW_DISSECT_RET_OUT_BAD;
470
471 key_arp = skb_flow_dissector_target(flow_dissector,
472 FLOW_DISSECTOR_KEY_ARP,
473 target_container);
474
475 memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
476 memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
477
478 /* Only store the lower byte of the opcode;
479 * this covers ARPOP_REPLY and ARPOP_REQUEST.
480 */
481 key_arp->op = ntohs(arp->ar_op) & 0xff;
482
483 ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
484 ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
485
486 return FLOW_DISSECT_RET_OUT_GOOD;
487}
488
7c92de8e
JP		 489static enum flow_dissect_ret
490__skb_flow_dissect_gre(const struct sk_buff *skb,
491 struct flow_dissector_key_control *key_control,
492 struct flow_dissector *flow_dissector,
493 void *target_container, void *data,
494 __be16 *p_proto, int *p_nhoff, int *p_hlen,
495 unsigned int flags)
496{
497 struct flow_dissector_key_keyid *key_keyid;
498 struct gre_base_hdr *hdr, _hdr;
499 int offset = 0;
500 u16 gre_ver;
501
502 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
503 data, *p_hlen, &_hdr);
504 if (!hdr)
505 return FLOW_DISSECT_RET_OUT_BAD;
506
507 /* Only look inside GRE without routing */
508 if (hdr->flags & GRE_ROUTING)
509 return FLOW_DISSECT_RET_OUT_GOOD;
510
511 /* Only look inside GRE for version 0 and 1 */
512 gre_ver = ntohs(hdr->flags & GRE_VERSION);
513 if (gre_ver > 1)
514 return FLOW_DISSECT_RET_OUT_GOOD;
515
516 *p_proto = hdr->protocol;
517 if (gre_ver) {
518 /* Version1 must be PPTP, and check the flags */
519 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
520 return FLOW_DISSECT_RET_OUT_GOOD;
521 }
522
523 offset += sizeof(struct gre_base_hdr);
524
525 if (hdr->flags & GRE_CSUM)
f195efb4 526 offset += FIELD_SIZEOF(struct gre_full_hdr, csum) +
527 FIELD_SIZEOF(struct gre_full_hdr, reserved1);
7c92de8e
JP		 528
529 if (hdr->flags & GRE_KEY) {
530 const __be32 *keyid;
531 __be32 _keyid;
532
533 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
534 sizeof(_keyid),
535 data, *p_hlen, &_keyid);
536 if (!keyid)
537 return FLOW_DISSECT_RET_OUT_BAD;
538
539 if (dissector_uses_key(flow_dissector,
540 FLOW_DISSECTOR_KEY_GRE_KEYID)) {
541 key_keyid = skb_flow_dissector_target(flow_dissector,
542 FLOW_DISSECTOR_KEY_GRE_KEYID,
543 target_container);
544 if (gre_ver == 0)
545 key_keyid->keyid = *keyid;
546 else
547 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
548 }
f195efb4 549 offset += FIELD_SIZEOF(struct gre_full_hdr, key);
7c92de8e
JP		 550 }
551
552 if (hdr->flags & GRE_SEQ)
f195efb4 553 offset += FIELD_SIZEOF(struct pptp_gre_header, seq);
7c92de8e
JP		 554
555 if (gre_ver == 0) {
556 if (*p_proto == htons(ETH_P_TEB)) {
557 const struct ethhdr *eth;
558 struct ethhdr _eth;
559
560 eth = __skb_header_pointer(skb, *p_nhoff + offset,
561 sizeof(_eth),
562 data, *p_hlen, &_eth);
563 if (!eth)
564 return FLOW_DISSECT_RET_OUT_BAD;
565 *p_proto = eth->h_proto;
566 offset += sizeof(*eth);
567
568 /* Cap headers that we access via pointers at the
569 * end of the Ethernet header as our maximum alignment
570 * at that point is only 2 bytes.
571 */
572 if (NET_IP_ALIGN)
573 *p_hlen = *p_nhoff + offset;
574 }
575 } else { /* version 1, must be PPTP */
576 u8 _ppp_hdr[PPP_HDRLEN];
577 u8 *ppp_hdr;
578
579 if (hdr->flags & GRE_ACK)
f195efb4 580 offset += FIELD_SIZEOF(struct pptp_gre_header, ack);
7c92de8e
JP		 581
582 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
583 sizeof(_ppp_hdr),
584 data, *p_hlen, _ppp_hdr);
585 if (!ppp_hdr)
586 return FLOW_DISSECT_RET_OUT_BAD;
587
588 switch (PPP_PROTOCOL(ppp_hdr)) {
589 case PPP_IP:
590 *p_proto = htons(ETH_P_IP);
591 break;
592 case PPP_IPV6:
593 *p_proto = htons(ETH_P_IPV6);
594 break;
595 default:
596 /* Could probably catch some more like MPLS */
597 break;
598 }
599
600 offset += PPP_HDRLEN;
601 }
602
603 *p_nhoff += offset;
604 key_control->flags |= FLOW_DIS_ENCAPSULATION;
605 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
606 return FLOW_DISSECT_RET_OUT_GOOD;
607
3a1214e8 608 return FLOW_DISSECT_RET_PROTO_AGAIN;
7c92de8e
JP		 609}
610
5b0890a9
SE		 611/**
612 * __skb_flow_dissect_batadv() - dissect batman-adv header
613 * @skb: sk_buff to with the batman-adv header
614 * @key_control: flow dissectors control key
615 * @data: raw buffer pointer to the packet, if NULL use skb->data
616 * @p_proto: pointer used to update the protocol to process next
617 * @p_nhoff: pointer used to update inner network header offset
618 * @hlen: packet header length
619 * @flags: any combination of FLOW_DISSECTOR_F_*
620 *
621 * ETH_P_BATMAN packets are tried to be dissected. Only
622 * &struct batadv_unicast packets are actually processed because they contain an
623 * inner ethernet header and are usually followed by actual network header. This
624 * allows the flow dissector to continue processing the packet.
625 *
626 * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
627 * FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
628 * otherwise FLOW_DISSECT_RET_OUT_BAD
629 */
630static enum flow_dissect_ret
631__skb_flow_dissect_batadv(const struct sk_buff *skb,
632 struct flow_dissector_key_control *key_control,
633 void *data, __be16 *p_proto, int *p_nhoff, int hlen,
634 unsigned int flags)
635{
636 struct {
637 struct batadv_unicast_packet batadv_unicast;
638 struct ethhdr eth;
639 } *hdr, _hdr;
640
641 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
642 &_hdr);
643 if (!hdr)
644 return FLOW_DISSECT_RET_OUT_BAD;
645
646 if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
647 return FLOW_DISSECT_RET_OUT_BAD;
648
649 if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
650 return FLOW_DISSECT_RET_OUT_BAD;
651
652 *p_proto = hdr->eth.h_proto;
653 *p_nhoff += sizeof(*hdr);
654
655 key_control->flags |= FLOW_DIS_ENCAPSULATION;
656 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
657 return FLOW_DISSECT_RET_OUT_GOOD;
658
659 return FLOW_DISSECT_RET_PROTO_AGAIN;
660}
661
ac4bb5de
JP		 662static void
663__skb_flow_dissect_tcp(const struct sk_buff *skb,
664 struct flow_dissector *flow_dissector,
665 void *target_container, void *data, int thoff, int hlen)
666{
667 struct flow_dissector_key_tcp *key_tcp;
668 struct tcphdr *th, _th;
669
670 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
671 return;
672
673 th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
674 if (!th)
675 return;
676
677 if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
678 return;
679
680 key_tcp = skb_flow_dissector_target(flow_dissector,
681 FLOW_DISSECTOR_KEY_TCP,
682 target_container);
683 key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
684}
685
518d8a2e
OG		 686static void
687__skb_flow_dissect_ipv4(const struct sk_buff *skb,
688 struct flow_dissector *flow_dissector,
689 void *target_container, void *data, const struct iphdr *iph)
690{
691 struct flow_dissector_key_ip *key_ip;
692
693 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
694 return;
695
696 key_ip = skb_flow_dissector_target(flow_dissector,
697 FLOW_DISSECTOR_KEY_IP,
698 target_container);
699 key_ip->tos = iph->tos;
700 key_ip->ttl = iph->ttl;
701}
702
703static void
704__skb_flow_dissect_ipv6(const struct sk_buff *skb,
705 struct flow_dissector *flow_dissector,
706 void *target_container, void *data, const struct ipv6hdr *iph)
707{
708 struct flow_dissector_key_ip *key_ip;
709
710 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
711 return;
712
713 key_ip = skb_flow_dissector_target(flow_dissector,
714 FLOW_DISSECTOR_KEY_IP,
715 target_container);
716 key_ip->tos = ipv6_get_dsfield(iph);
717 key_ip->ttl = iph->hop_limit;
718}
719
1eed4dfb
TH		 720/* Maximum number of protocol headers that can be parsed in
721 * __skb_flow_dissect
722 */
723#define MAX_FLOW_DISSECT_HDRS 15
724
725static bool skb_flow_dissect_allowed(int *num_hdrs)
726{
727 ++*num_hdrs;
728
729 return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
730}
731
d58e468b
PP		 732static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
733 struct flow_dissector *flow_dissector,
734 void *target_container)
735{
736 struct flow_dissector_key_control *key_control;
737 struct flow_dissector_key_basic *key_basic;
738 struct flow_dissector_key_addrs *key_addrs;
739 struct flow_dissector_key_ports *key_ports;
71c99e32 740 struct flow_dissector_key_tags *key_tags;
d58e468b
PP		 741
742 key_control = skb_flow_dissector_target(flow_dissector,
743 FLOW_DISSECTOR_KEY_CONTROL,
744 target_container);
745 key_control->thoff = flow_keys->thoff;
746 if (flow_keys->is_frag)
747 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
748 if (flow_keys->is_first_frag)
749 key_control->flags |= FLOW_DIS_FIRST_FRAG;
750 if (flow_keys->is_encap)
751 key_control->flags |= FLOW_DIS_ENCAPSULATION;
752
753 key_basic = skb_flow_dissector_target(flow_dissector,
754 FLOW_DISSECTOR_KEY_BASIC,
755 target_container);
756 key_basic->n_proto = flow_keys->n_proto;
757 key_basic->ip_proto = flow_keys->ip_proto;
758
759 if (flow_keys->addr_proto == ETH_P_IP &&
760 dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
761 key_addrs = skb_flow_dissector_target(flow_dissector,
762 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
763 target_container);
764 key_addrs->v4addrs.src = flow_keys->ipv4_src;
765 key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
766 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
767 } else if (flow_keys->addr_proto == ETH_P_IPV6 &&
768 dissector_uses_key(flow_dissector,
769 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
770 key_addrs = skb_flow_dissector_target(flow_dissector,
771 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
772 target_container);
773 memcpy(&key_addrs->v6addrs, &flow_keys->ipv6_src,
774 sizeof(key_addrs->v6addrs));
775 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
776 }
777
778 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS)) {
779 key_ports = skb_flow_dissector_target(flow_dissector,
780 FLOW_DISSECTOR_KEY_PORTS,
781 target_container);
782 key_ports->src = flow_keys->sport;
783 key_ports->dst = flow_keys->dport;
784 }
71c99e32
SF		 785
786 if (dissector_uses_key(flow_dissector,
787 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
788 key_tags = skb_flow_dissector_target(flow_dissector,
789 FLOW_DISSECTOR_KEY_FLOW_LABEL,
790 target_container);
791 key_tags->flow_label = ntohl(flow_keys->flow_label);
792 }
d58e468b
PP		 793}
794
089b19a9 795bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
086f9568 796 __be16 proto, int nhoff, int hlen, unsigned int flags)
089b19a9
SF		 797{
798 struct bpf_flow_keys *flow_keys = ctx->flow_keys;
799 u32 result;
c8aa7038
SF		 800
801 /* Pass parameters to the BPF program */
802 memset(flow_keys, 0, sizeof(*flow_keys));
089b19a9
SF		 803 flow_keys->n_proto = proto;
804 flow_keys->nhoff = nhoff;
c8aa7038
SF		 805 flow_keys->thoff = flow_keys->nhoff;
806
086f9568
SF		 807 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
808 (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
809 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
810 (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
811 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
812 (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
813 flow_keys->flags = flags;
814
b1c17a9a 815 preempt_disable();
089b19a9 816 result = BPF_PROG_RUN(prog, ctx);
b1c17a9a 817 preempt_enable();
c8aa7038 818
089b19a9 819 flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
c8aa7038 820 flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
089b19a9 821 flow_keys->nhoff, hlen);
c8aa7038
SF		 822
823 return result == BPF_OK;
824}
825
453a940e
WC		 826/**
827 * __skb_flow_dissect - extract the flow_keys struct and return it
3cbf4ffb 828 * @net: associated network namespace, derived from @skb if NULL
453a940e 829 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
06635a35
JP		 830 * @flow_dissector: list of keys to dissect
831 * @target_container: target structure to put dissected values into
453a940e
WC		 832 * @data: raw buffer pointer to the packet, if NULL use skb->data
833 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
834 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
835 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
d79b3baf 836 * @flags: flags that control the dissection process, e.g.
1cc26450 837 * FLOW_DISSECTOR_F_STOP_AT_ENCAP.
453a940e 838 *
06635a35
JP		 839 * The function will try to retrieve individual keys into target specified
840 * by flow_dissector from either the skbuff or a raw buffer specified by the
841 * rest parameters.
842 *
843 * Caller must take care of zeroing target container memory.
453a940e 844 */
3cbf4ffb
SF		 845bool __skb_flow_dissect(const struct net *net,
846 const struct sk_buff *skb,
06635a35
JP		 847 struct flow_dissector *flow_dissector,
848 void *target_container,
cd79a238
TH		 849 void *data, __be16 proto, int nhoff, int hlen,
850 unsigned int flags)
0744dd00 851{
42aecaa9 852 struct flow_dissector_key_control *key_control;
06635a35
JP		 853 struct flow_dissector_key_basic *key_basic;
854 struct flow_dissector_key_addrs *key_addrs;
855 struct flow_dissector_key_ports *key_ports;
972d3876 856 struct flow_dissector_key_icmp *key_icmp;
d34af823 857 struct flow_dissector_key_tags *key_tags;
f6a66927 858 struct flow_dissector_key_vlan *key_vlan;
9b52e3f2 859 struct bpf_prog *attached = NULL;
3a1214e8 860 enum flow_dissect_ret fdret;
24c590e3 861 enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
1eed4dfb 862 int num_hdrs = 0;
8e690ffd 863 u8 ip_proto = 0;
34fad54c 864 bool ret;
0744dd00 865
690e36e7
DM		 866 if (!data) {
867 data = skb->data;
d5709f7a
HHZ		 868 proto = skb_vlan_tag_present(skb) ?
869 skb->vlan_proto : skb->protocol;
453a940e 870 nhoff = skb_network_offset(skb);
690e36e7 871 hlen = skb_headlen(skb);
2d571645 872#if IS_ENABLED(CONFIG_NET_DSA)
7324157b 873 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev))) {
43e66528
JC		 874 const struct dsa_device_ops *ops;
875 int offset;
876
877 ops = skb->dev->dsa_ptr->tag_ops;
878 if (ops->flow_dissect &&
879 !ops->flow_dissect(skb, &proto, &offset)) {
880 hlen -= offset;
881 nhoff += offset;
882 }
883 }
2d571645 884#endif
690e36e7
DM		 885 }
886
42aecaa9
TH		 887 /* It is ensured by skb_flow_dissector_init() that control key will
888 * be always present.
889 */
890 key_control = skb_flow_dissector_target(flow_dissector,
891 FLOW_DISSECTOR_KEY_CONTROL,
892 target_container);
893
06635a35
JP		 894 /* It is ensured by skb_flow_dissector_init() that basic key will
895 * be always present.
896 */
897 key_basic = skb_flow_dissector_target(flow_dissector,
898 FLOW_DISSECTOR_KEY_BASIC,
899 target_container);
0744dd00 900
d0e13a14 901 if (skb) {
3cbf4ffb
SF		 902 if (!net) {
903 if (skb->dev)
904 net = dev_net(skb->dev);
905 else if (skb->sk)
906 net = sock_net(skb->sk);
3cbf4ffb 907 }
9b52e3f2 908 }
c8aa7038 909
9b52e3f2
SF		 910 WARN_ON_ONCE(!net);
911 if (net) {
912 rcu_read_lock();
913 attached = rcu_dereference(net->flow_dissector_prog);
d58e468b 914
c8aa7038 915 if (attached) {
9b52e3f2
SF		 916 struct bpf_flow_keys flow_keys;
917 struct bpf_flow_dissector ctx = {
918 .flow_keys = &flow_keys,
919 .data = data,
920 .data_end = data + hlen,
921 };
922 __be16 n_proto = proto;
923
924 if (skb) {
925 ctx.skb = skb;
926 /* we can't use 'proto' in the skb case
927 * because it might be set to skb->vlan_proto
928 * which has been pulled from the data
929 */
930 n_proto = skb->protocol;
931 }
932
933 ret = bpf_flow_dissect(attached, &ctx, n_proto, nhoff,
086f9568 934 hlen, flags);
c8aa7038
SF		 935 __skb_flow_bpf_to_target(&flow_keys, flow_dissector,
936 target_container);
937 rcu_read_unlock();
938 return ret;
939 }
d58e468b 940 rcu_read_unlock();
d58e468b 941 }
d58e468b 942
20a17bf6
DM		 943 if (dissector_uses_key(flow_dissector,
944 FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
67a900cc
JP		 945 struct ethhdr *eth = eth_hdr(skb);
946 struct flow_dissector_key_eth_addrs *key_eth_addrs;
947
948 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
949 FLOW_DISSECTOR_KEY_ETH_ADDRS,
950 target_container);
951 memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
952 }
953
c5ef188e 954proto_again:
3a1214e8
TH		 955 fdret = FLOW_DISSECT_RET_CONTINUE;
956
0744dd00 957 switch (proto) {
2b8837ae 958 case htons(ETH_P_IP): {
0744dd00
ED		 959 const struct iphdr *iph;
960 struct iphdr _iph;
3a1214e8 961
690e36e7 962 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
3a1214e8
TH		 963 if (!iph || iph->ihl < 5) {
964 fdret = FLOW_DISSECT_RET_OUT_BAD;
965 break;
966 }
967
3797d3e8 968 nhoff += iph->ihl * 4;
0744dd00 969
3797d3e8 970 ip_proto = iph->protocol;
3797d3e8 971
918c023f
AD		 972 if (dissector_uses_key(flow_dissector,
973 FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
974 key_addrs = skb_flow_dissector_target(flow_dissector,
975 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
976 target_container);
977
978 memcpy(&key_addrs->v4addrs, &iph->saddr,
979 sizeof(key_addrs->v4addrs));
980 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
981 }
807e165d
TH		 982
983 if (ip_is_fragment(iph)) {
4b36993d 984 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
807e165d
TH		 985
986 if (iph->frag_off & htons(IP_OFFSET)) {
3a1214e8
TH		 987 fdret = FLOW_DISSECT_RET_OUT_GOOD;
988 break;
807e165d 989 } else {
4b36993d 990 key_control->flags |= FLOW_DIS_FIRST_FRAG;
3a1214e8
TH		 991 if (!(flags &
992 FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
993 fdret = FLOW_DISSECT_RET_OUT_GOOD;
994 break;
995 }
807e165d
TH		 996 }
997 }
998
518d8a2e
OG		 999 __skb_flow_dissect_ipv4(skb, flow_dissector,
1000 target_container, data, iph);
1001
0744dd00
ED		 1002 break;
1003 }
2b8837ae 1004 case htons(ETH_P_IPV6): {
0744dd00
ED		 1005 const struct ipv6hdr *iph;
1006 struct ipv6hdr _iph;
19469a87 1007
690e36e7 1008 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
3a1214e8
TH		 1009 if (!iph) {
1010 fdret = FLOW_DISSECT_RET_OUT_BAD;
1011 break;
1012 }
0744dd00
ED		 1013
1014 ip_proto = iph->nexthdr;
0744dd00 1015 nhoff += sizeof(struct ipv6hdr);
19469a87 1016
20a17bf6
DM		 1017 if (dissector_uses_key(flow_dissector,
1018 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
b3c3106c
AD		 1019 key_addrs = skb_flow_dissector_target(flow_dissector,
1020 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1021 target_container);
5af7fb6e 1022
b3c3106c
AD		 1023 memcpy(&key_addrs->v6addrs, &iph->saddr,
1024 sizeof(key_addrs->v6addrs));
c3f83241 1025 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
b924933c 1026 }
87ee9e52 1027
461547f3
AD		 1028 if ((dissector_uses_key(flow_dissector,
1029 FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1030 (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1031 ip6_flowlabel(iph)) {
1032 __be32 flow_label = ip6_flowlabel(iph);
1033
20a17bf6
DM		 1034 if (dissector_uses_key(flow_dissector,
1035 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
87ee9e52
TH		 1036 key_tags = skb_flow_dissector_target(flow_dissector,
1037 FLOW_DISSECTOR_KEY_FLOW_LABEL,
1038 target_container);
1039 key_tags->flow_label = ntohl(flow_label);
12c227ec 1040 }
3a1214e8
TH		 1041 if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1042 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1043 break;
1044 }
19469a87
TH		 1045 }
1046
518d8a2e
OG		 1047 __skb_flow_dissect_ipv6(skb, flow_dissector,
1048 target_container, data, iph);
1049
0744dd00
ED		 1050 break;
1051 }
2b8837ae
JP		 1052 case htons(ETH_P_8021AD):
1053 case htons(ETH_P_8021Q): {
24c590e3 1054 const struct vlan_hdr *vlan = NULL;
bc72f3dd 1055 struct vlan_hdr _vlan;
2064c3d4 1056 __be16 saved_vlan_tpid = proto;
0744dd00 1057
24c590e3
JL		 1058 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1059 skb && skb_vlan_tag_present(skb)) {
d5709f7a 1060 proto = skb->protocol;
24c590e3 1061 } else {
d5709f7a
HHZ		 1062 vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1063 data, hlen, &_vlan);
3a1214e8
TH		 1064 if (!vlan) {
1065 fdret = FLOW_DISSECT_RET_OUT_BAD;
1066 break;
1067 }
1068
d5709f7a
HHZ		 1069 proto = vlan->h_vlan_encapsulated_proto;
1070 nhoff += sizeof(*vlan);
d5709f7a 1071 }
0744dd00 1072
24c590e3
JL		 1073 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1074 dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1075 } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1076 dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1077 } else {
1078 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1079 break;
1080 }
1081
1082 if (dissector_uses_key(flow_dissector, dissector_vlan)) {
f6a66927 1083 key_vlan = skb_flow_dissector_target(flow_dissector,
24c590e3 1084 dissector_vlan,
d34af823
TH		 1085 target_container);
1086
24c590e3 1087 if (!vlan) {
f6a66927 1088 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
9b319148 1089 key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
f6a66927
HHZ		 1090 } else {
1091 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
d5709f7a 1092 VLAN_VID_MASK;
f6a66927
HHZ		 1093 key_vlan->vlan_priority =
1094 (ntohs(vlan->h_vlan_TCI) &
1095 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1096 }
2064c3d4 1097 key_vlan->vlan_tpid = saved_vlan_tpid;
d34af823
TH		 1098 }
1099
3a1214e8
TH		 1100 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1101 break;
0744dd00 1102 }
2b8837ae 1103 case htons(ETH_P_PPP_SES): {
0744dd00
ED		 1104 struct {
1105 struct pppoe_hdr hdr;
1106 __be16 proto;
1107 } *hdr, _hdr;
690e36e7 1108 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
3a1214e8
TH		 1109 if (!hdr) {
1110 fdret = FLOW_DISSECT_RET_OUT_BAD;
1111 break;
1112 }
1113
0744dd00
ED		 1114 proto = hdr->proto;
1115 nhoff += PPPOE_SES_HLEN;
1116 switch (proto) {
2b8837ae 1117 case htons(PPP_IP):
3a1214e8
TH		 1118 proto = htons(ETH_P_IP);
1119 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1120 break;
2b8837ae 1121 case htons(PPP_IPV6):
3a1214e8
TH		 1122 proto = htons(ETH_P_IPV6);
1123 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1124 break;
0744dd00 1125 default:
3a1214e8
TH		 1126 fdret = FLOW_DISSECT_RET_OUT_BAD;
1127 break;
0744dd00 1128 }
3a1214e8 1129 break;
0744dd00 1130 }
08bfc9cb 1131 case htons(ETH_P_TIPC): {
8d6e79d3
JM		 1132 struct tipc_basic_hdr *hdr, _hdr;
1133
1134 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1135 data, hlen, &_hdr);
3a1214e8
TH		 1136 if (!hdr) {
1137 fdret = FLOW_DISSECT_RET_OUT_BAD;
1138 break;
1139 }
06635a35 1140
20a17bf6 1141 if (dissector_uses_key(flow_dissector,
8d6e79d3 1142 FLOW_DISSECTOR_KEY_TIPC)) {
06635a35 1143 key_addrs = skb_flow_dissector_target(flow_dissector,
8d6e79d3 1144 FLOW_DISSECTOR_KEY_TIPC,
06635a35 1145 target_container);
8d6e79d3
JM		 1146 key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1147 key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
06635a35 1148 }
3a1214e8
TH		 1149 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1150 break;
08bfc9cb 1151 }
b3baa0fb
TH		 1152
1153 case htons(ETH_P_MPLS_UC):
4a5d6c8b 1154 case htons(ETH_P_MPLS_MC):
3a1214e8 1155 fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
4a5d6c8b 1156 target_container, data,
3a1214e8
TH		 1157 nhoff, hlen);
1158 break;
56193d1b 1159 case htons(ETH_P_FCOE):
3a1214e8
TH		 1160 if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1161 fdret = FLOW_DISSECT_RET_OUT_BAD;
1162 break;
1163 }
224516b3
AD		 1164
1165 nhoff += FCOE_HEADER_LEN;
3a1214e8
TH		 1166 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1167 break;
55733350
SH		 1168
1169 case htons(ETH_P_ARP):
9bf881ff 1170 case htons(ETH_P_RARP):
3a1214e8 1171 fdret = __skb_flow_dissect_arp(skb, flow_dissector,
9bf881ff 1172 target_container, data,
3a1214e8
TH		 1173 nhoff, hlen);
1174 break;
1175
5b0890a9
SE		 1176 case htons(ETH_P_BATMAN):
1177 fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1178 &proto, &nhoff, hlen, flags);
1179 break;
1180
3a1214e8
TH		 1181 default:
1182 fdret = FLOW_DISSECT_RET_OUT_BAD;
1183 break;
1184 }
1185
1186 /* Process result of proto processing */
1187 switch (fdret) {
1188 case FLOW_DISSECT_RET_OUT_GOOD:
1189 goto out_good;
1190 case FLOW_DISSECT_RET_PROTO_AGAIN:
1eed4dfb
TH		 1191 if (skb_flow_dissect_allowed(&num_hdrs))
1192 goto proto_again;
1193 goto out_good;
3a1214e8
TH		 1194 case FLOW_DISSECT_RET_CONTINUE:
1195 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1196 break;
1197 case FLOW_DISSECT_RET_OUT_BAD:
0744dd00 1198 default:
a6e544b0 1199 goto out_bad;
0744dd00
ED		 1200 }
1201
6a74fcf4 1202ip_proto_again:
3a1214e8
TH		 1203 fdret = FLOW_DISSECT_RET_CONTINUE;
1204
0744dd00 1205 switch (ip_proto) {
7c92de8e 1206 case IPPROTO_GRE:
3a1214e8 1207 fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
7c92de8e 1208 target_container, data,
3a1214e8
TH		 1209 &proto, &nhoff, &hlen, flags);
1210 break;
1211
6a74fcf4
TH		 1212 case NEXTHDR_HOP:
1213 case NEXTHDR_ROUTING:
1214 case NEXTHDR_DEST: {
1215 u8 _opthdr[2], *opthdr;
1216
1217 if (proto != htons(ETH_P_IPV6))
1218 break;
1219
1220 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1221 data, hlen, &_opthdr);
3a1214e8
TH		 1222 if (!opthdr) {
1223 fdret = FLOW_DISSECT_RET_OUT_BAD;
1224 break;
1225 }
6a74fcf4 1226
1e98a0f0
ED		 1227 ip_proto = opthdr[0];
1228 nhoff += (opthdr[1] + 1) << 3;
6a74fcf4 1229
3a1214e8
TH		 1230 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1231 break;
6a74fcf4 1232 }
b840f28b
TH		 1233 case NEXTHDR_FRAGMENT: {
1234 struct frag_hdr _fh, *fh;
1235
1236 if (proto != htons(ETH_P_IPV6))
1237 break;
1238
1239 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1240 data, hlen, &_fh);
1241
3a1214e8
TH		 1242 if (!fh) {
1243 fdret = FLOW_DISSECT_RET_OUT_BAD;
1244 break;
1245 }
b840f28b 1246
4b36993d 1247 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
b840f28b
TH		 1248
1249 nhoff += sizeof(_fh);
43d2ccb3 1250 ip_proto = fh->nexthdr;
b840f28b
TH		 1251
1252 if (!(fh->frag_off & htons(IP6_OFFSET))) {
4b36993d 1253 key_control->flags |= FLOW_DIS_FIRST_FRAG;
3a1214e8
TH		 1254 if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1255 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1256 break;
1257 }
b840f28b 1258 }
3a1214e8
TH		 1259
1260 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1261 break;
b840f28b 1262 }
0744dd00 1263 case IPPROTO_IPIP:
fca41895 1264 proto = htons(ETH_P_IP);
823b9693 1265
4b36993d 1266 key_control->flags |= FLOW_DIS_ENCAPSULATION;
3a1214e8
TH		 1267 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1268 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1269 break;
1270 }
1271
1272 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1273 break;
823b9693 1274
b438f940
TH		 1275 case IPPROTO_IPV6:
1276 proto = htons(ETH_P_IPV6);
823b9693 1277
4b36993d 1278 key_control->flags |= FLOW_DIS_ENCAPSULATION;
3a1214e8
TH		 1279 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1280 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1281 break;
1282 }
1283
1284 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1285 break;
1286
823b9693 1287
b3baa0fb
TH		 1288 case IPPROTO_MPLS:
1289 proto = htons(ETH_P_MPLS_UC);
3a1214e8
TH		 1290 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1291 break;
1292
ac4bb5de
JP		 1293 case IPPROTO_TCP:
1294 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1295 data, nhoff, hlen);
1296 break;
3a1214e8 1297
0744dd00
ED		 1298 default:
1299 break;
1300 }
1301
62230715 1302 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS) &&
1303 !(key_control->flags & FLOW_DIS_IS_FRAGMENT)) {
06635a35
JP		 1304 key_ports = skb_flow_dissector_target(flow_dissector,
1305 FLOW_DISSECTOR_KEY_PORTS,
1306 target_container);
1307 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
1308 data, hlen);
1309 }
5af7fb6e 1310
972d3876
SH		 1311 if (dissector_uses_key(flow_dissector,
1312 FLOW_DISSECTOR_KEY_ICMP)) {
1313 key_icmp = skb_flow_dissector_target(flow_dissector,
1314 FLOW_DISSECTOR_KEY_ICMP,
1315 target_container);
1316 key_icmp->icmp = skb_flow_get_be16(skb, nhoff, data, hlen);
1317 }
1318
3a1214e8
TH		 1319 /* Process result of IP proto processing */
1320 switch (fdret) {
1321 case FLOW_DISSECT_RET_PROTO_AGAIN:
1eed4dfb
TH		 1322 if (skb_flow_dissect_allowed(&num_hdrs))
1323 goto proto_again;
1324 break;
3a1214e8 1325 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1eed4dfb
TH		 1326 if (skb_flow_dissect_allowed(&num_hdrs))
1327 goto ip_proto_again;
1328 break;
3a1214e8
TH		 1329 case FLOW_DISSECT_RET_OUT_GOOD:
1330 case FLOW_DISSECT_RET_CONTINUE:
1331 break;
1332 case FLOW_DISSECT_RET_OUT_BAD:
1333 default:
1334 goto out_bad;
1335 }
1336
a6e544b0
TH		 1337out_good:
1338 ret = true;
1339
34fad54c 1340out:
d0c081b4 1341 key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
a6e544b0
TH		 1342 key_basic->n_proto = proto;
1343 key_basic->ip_proto = ip_proto;
a6e544b0
TH		 1344
1345 return ret;
34fad54c
ED		 1346
1347out_bad:
1348 ret = false;
34fad54c 1349 goto out;
0744dd00 1350}
690e36e7 1351EXPORT_SYMBOL(__skb_flow_dissect);
441d9d32
CW		 1352
1353static u32 hashrnd __read_mostly;
66415cf8
HFS		 1354static __always_inline void __flow_hash_secret_init(void)
1355{
1356 net_get_random_once(&hashrnd, sizeof(hashrnd));
1357}
1358
20a17bf6
DM		 1359static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
1360 u32 keyval)
42aecaa9
TH		 1361{
1362 return jhash2(words, length, keyval);
1363}
1364
20a17bf6 1365static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
66415cf8 1366{
20a17bf6
DM		 1367 const void *p = flow;
1368
42aecaa9 1369 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
20a17bf6 1370 return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
42aecaa9
TH		 1371}
1372
20a17bf6 1373static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
42aecaa9 1374{
c3f83241 1375 size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
42aecaa9 1376 BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
c3f83241
TH		 1377 BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
1378 sizeof(*flow) - sizeof(flow->addrs));
1379
1380 switch (flow->control.addr_type) {
1381 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1382 diff -= sizeof(flow->addrs.v4addrs);
1383 break;
1384 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1385 diff -= sizeof(flow->addrs.v6addrs);
1386 break;
8d6e79d3
JM		 1387 case FLOW_DISSECTOR_KEY_TIPC:
1388 diff -= sizeof(flow->addrs.tipckey);
9f249089 1389 break;
c3f83241
TH		 1390 }
1391 return (sizeof(*flow) - diff) / sizeof(u32);
1392}
1393
1394__be32 flow_get_u32_src(const struct flow_keys *flow)
1395{
1396 switch (flow->control.addr_type) {
1397 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1398 return flow->addrs.v4addrs.src;
1399 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1400 return (__force __be32)ipv6_addr_hash(
1401 &flow->addrs.v6addrs.src);
8d6e79d3
JM		 1402 case FLOW_DISSECTOR_KEY_TIPC:
1403 return flow->addrs.tipckey.key;
c3f83241
TH		 1404 default:
1405 return 0;
1406 }
1407}
1408EXPORT_SYMBOL(flow_get_u32_src);
1409
1410__be32 flow_get_u32_dst(const struct flow_keys *flow)
1411{
1412 switch (flow->control.addr_type) {
1413 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1414 return flow->addrs.v4addrs.dst;
1415 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1416 return (__force __be32)ipv6_addr_hash(
1417 &flow->addrs.v6addrs.dst);
1418 default:
1419 return 0;
1420 }
1421}
1422EXPORT_SYMBOL(flow_get_u32_dst);
1423
1424static inline void __flow_hash_consistentify(struct flow_keys *keys)
1425{
1426 int addr_diff, i;
1427
1428 switch (keys->control.addr_type) {
1429 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1430 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
1431 (__force u32)keys->addrs.v4addrs.src;
1432 if ((addr_diff < 0) ||
1433 (addr_diff == 0 &&
1434 ((__force u16)keys->ports.dst <
1435 (__force u16)keys->ports.src))) {
1436 swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1437 swap(keys->ports.src, keys->ports.dst);
1438 }
1439 break;
1440 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1441 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1442 &keys->addrs.v6addrs.src,
1443 sizeof(keys->addrs.v6addrs.dst));
1444 if ((addr_diff < 0) ||
1445 (addr_diff == 0 &&
1446 ((__force u16)keys->ports.dst <
1447 (__force u16)keys->ports.src))) {
1448 for (i = 0; i < 4; i++)
1449 swap(keys->addrs.v6addrs.src.s6_addr32[i],
1450 keys->addrs.v6addrs.dst.s6_addr32[i]);
1451 swap(keys->ports.src, keys->ports.dst);
1452 }
1453 break;
1454 }
66415cf8
HFS		 1455}
1456
50fb7992 1457static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
5ed20a68
TH		 1458{
1459 u32 hash;
1460
c3f83241 1461 __flow_hash_consistentify(keys);
5ed20a68 1462
20a17bf6 1463 hash = __flow_hash_words(flow_keys_hash_start(keys),
42aecaa9 1464 flow_keys_hash_length(keys), keyval);
5ed20a68
TH		 1465 if (!hash)
1466 hash = 1;
1467
1468 return hash;
1469}
1470
1471u32 flow_hash_from_keys(struct flow_keys *keys)
1472{
50fb7992
TH		 1473 __flow_hash_secret_init();
1474 return __flow_hash_from_keys(keys, hashrnd);
5ed20a68
TH		 1475}
1476EXPORT_SYMBOL(flow_hash_from_keys);
1477
50fb7992
TH		 1478static inline u32 ___skb_get_hash(const struct sk_buff *skb,
1479 struct flow_keys *keys, u32 keyval)
1480{
6db61d79
TH		 1481 skb_flow_dissect_flow_keys(skb, keys,
1482 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
50fb7992
TH		 1483
1484 return __flow_hash_from_keys(keys, keyval);
1485}
1486
2f59e1eb
TH		 1487struct _flow_keys_digest_data {
1488 __be16 n_proto;
1489 u8 ip_proto;
1490 u8 padding;
1491 __be32 ports;
1492 __be32 src;
1493 __be32 dst;
1494};
1495
1496void make_flow_keys_digest(struct flow_keys_digest *digest,
1497 const struct flow_keys *flow)
1498{
1499 struct _flow_keys_digest_data *data =
1500 (struct _flow_keys_digest_data *)digest;
1501
1502 BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1503
1504 memset(digest, 0, sizeof(*digest));
1505
06635a35
JP		 1506 data->n_proto = flow->basic.n_proto;
1507 data->ip_proto = flow->basic.ip_proto;
1508 data->ports = flow->ports.ports;
c3f83241
TH		 1509 data->src = flow->addrs.v4addrs.src;
1510 data->dst = flow->addrs.v4addrs.dst;
2f59e1eb
TH		 1511}
1512EXPORT_SYMBOL(make_flow_keys_digest);
1513
eb70db87
DM		 1514static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1515
b917783c 1516u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
eb70db87
DM		 1517{
1518 struct flow_keys keys;
1519
1520 __flow_hash_secret_init();
1521
1522 memset(&keys, 0, sizeof(keys));
3cbf4ffb
SF		 1523 __skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1524 &keys, NULL, 0, 0, 0,
eb70db87
DM		 1525 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1526
1527 return __flow_hash_from_keys(&keys, hashrnd);
1528}
1529EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1530
d4fd3275
JP		 1531/**
1532 * __skb_get_hash: calculate a flow hash
1533 * @skb: sk_buff to calculate flow hash from
1534 *
1535 * This function calculates a flow hash based on src/dst addresses
61b905da
TH		 1536 * and src/dst port numbers. Sets hash in skb to non-zero hash value
1537 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
441d9d32
CW		 1538 * if hash is a canonical 4-tuple hash over transport ports.
1539 */
3958afa1 1540void __skb_get_hash(struct sk_buff *skb)
441d9d32
CW		 1541{
1542 struct flow_keys keys;
635c223c 1543 u32 hash;
441d9d32 1544
50fb7992
TH		 1545 __flow_hash_secret_init();
1546
635c223c
GF		 1547 hash = ___skb_get_hash(skb, &keys, hashrnd);
1548
1549 __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
441d9d32 1550}
3958afa1 1551EXPORT_SYMBOL(__skb_get_hash);
441d9d32 1552
50fb7992
TH		 1553__u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb)
1554{
1555 struct flow_keys keys;
1556
1557 return ___skb_get_hash(skb, &keys, perturb);
1558}
1559EXPORT_SYMBOL(skb_get_hash_perturb);
1560
56193d1b 1561u32 __skb_get_poff(const struct sk_buff *skb, void *data,
72a338bc 1562 const struct flow_keys_basic *keys, int hlen)
f77668dc 1563{
42aecaa9 1564 u32 poff = keys->control.thoff;
f77668dc 1565
43d2ccb3
AD		 1566 /* skip L4 headers for fragments after the first */
1567 if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1568 !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1569 return poff;
1570
06635a35 1571 switch (keys->basic.ip_proto) {
f77668dc 1572 case IPPROTO_TCP: {
5af7fb6e
AD		 1573 /* access doff as u8 to avoid unaligned access */
1574 const u8 *doff;
1575 u8 _doff;
f77668dc 1576
5af7fb6e
AD		 1577 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1578 data, hlen, &_doff);
1579 if (!doff)
f77668dc
DB		 1580 return poff;
1581
5af7fb6e 1582 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
f77668dc
DB		 1583 break;
1584 }
1585 case IPPROTO_UDP:
1586 case IPPROTO_UDPLITE:
1587 poff += sizeof(struct udphdr);
1588 break;
1589 /* For the rest, we do not really care about header
1590 * extensions at this point for now.
1591 */
1592 case IPPROTO_ICMP:
1593 poff += sizeof(struct icmphdr);
1594 break;
1595 case IPPROTO_ICMPV6:
1596 poff += sizeof(struct icmp6hdr);
1597 break;
1598 case IPPROTO_IGMP:
1599 poff += sizeof(struct igmphdr);
1600 break;
1601 case IPPROTO_DCCP:
1602 poff += sizeof(struct dccp_hdr);
1603 break;
1604 case IPPROTO_SCTP:
1605 poff += sizeof(struct sctphdr);
1606 break;
1607 }
1608
1609 return poff;
1610}
1611
0db89b8b
JP		 1612/**
1613 * skb_get_poff - get the offset to the payload
1614 * @skb: sk_buff to get the payload offset from
1615 *
1616 * The function will get the offset to the payload as far as it could
1617 * be dissected. The main user is currently BPF, so that we can dynamically
56193d1b
AD		 1618 * truncate packets without needing to push actual payload to the user
1619 * space and can analyze headers only, instead.
1620 */
1621u32 skb_get_poff(const struct sk_buff *skb)
1622{
72a338bc 1623 struct flow_keys_basic keys;
56193d1b 1624
3cbf4ffb
SF		 1625 if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1626 NULL, 0, 0, 0, 0))
56193d1b
AD		 1627 return 0;
1628
1629 return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1630}
06635a35 1631
20a17bf6 1632__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
a17ace95
DM		 1633{
1634 memset(keys, 0, sizeof(*keys));
1635
1636 memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1637 sizeof(keys->addrs.v6addrs.src));
1638 memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1639 sizeof(keys->addrs.v6addrs.dst));
1640 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1641 keys->ports.src = fl6->fl6_sport;
1642 keys->ports.dst = fl6->fl6_dport;
1643 keys->keyid.keyid = fl6->fl6_gre_key;
fa1be7e0 1644 keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
a17ace95
DM		 1645 keys->basic.ip_proto = fl6->flowi6_proto;
1646
1647 return flow_hash_from_keys(keys);
1648}
1649EXPORT_SYMBOL(__get_hash_from_flowi6);
1650
06635a35 1651static const struct flow_dissector_key flow_keys_dissector_keys[] = {
42aecaa9
TH		 1652 {
1653 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1654 .offset = offsetof(struct flow_keys, control),
1655 },
06635a35
JP		 1656 {
1657 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1658 .offset = offsetof(struct flow_keys, basic),
1659 },
1660 {
1661 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
c3f83241
TH		 1662 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1663 },
1664 {
1665 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1666 .offset = offsetof(struct flow_keys, addrs.v6addrs),
06635a35 1667 },
9f249089 1668 {
8d6e79d3
JM		 1669 .key_id = FLOW_DISSECTOR_KEY_TIPC,
1670 .offset = offsetof(struct flow_keys, addrs.tipckey),
9f249089 1671 },
06635a35
JP		 1672 {
1673 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1674 .offset = offsetof(struct flow_keys, ports),
1675 },
d34af823 1676 {
f6a66927
HHZ		 1677 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1678 .offset = offsetof(struct flow_keys, vlan),
d34af823 1679 },
87ee9e52
TH		 1680 {
1681 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1682 .offset = offsetof(struct flow_keys, tags),
1683 },
1fdd512c
TH		 1684 {
1685 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1686 .offset = offsetof(struct flow_keys, keyid),
1687 },
06635a35
JP		 1688};
1689
eb70db87
DM		 1690static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1691 {
1692 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1693 .offset = offsetof(struct flow_keys, control),
1694 },
1695 {
1696 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1697 .offset = offsetof(struct flow_keys, basic),
1698 },
1699 {
1700 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1701 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1702 },
1703 {
1704 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1705 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1706 },
1707 {
1708 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1709 .offset = offsetof(struct flow_keys, ports),
1710 },
1711};
1712
72a338bc 1713static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
42aecaa9
TH		 1714 {
1715 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1716 .offset = offsetof(struct flow_keys, control),
1717 },
06635a35
JP		 1718 {
1719 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1720 .offset = offsetof(struct flow_keys, basic),
1721 },
1722};
1723
1724struct flow_dissector flow_keys_dissector __read_mostly;
1725EXPORT_SYMBOL(flow_keys_dissector);
1726
72a338bc
PA		 1727struct flow_dissector flow_keys_basic_dissector __read_mostly;
1728EXPORT_SYMBOL(flow_keys_basic_dissector);
06635a35
JP		 1729
1730static int __init init_default_flow_dissectors(void)
1731{
1732 skb_flow_dissector_init(&flow_keys_dissector,
1733 flow_keys_dissector_keys,
1734 ARRAY_SIZE(flow_keys_dissector_keys));
eb70db87
DM		 1735 skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1736 flow_keys_dissector_symmetric_keys,
1737 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
72a338bc
PA		 1738 skb_flow_dissector_init(&flow_keys_basic_dissector,
1739 flow_keys_basic_dissector_keys,
1740 ARRAY_SIZE(flow_keys_basic_dissector_keys));
06635a35
JP		 1741 return 0;
1742}
1743
c9b8af13 1744core_initcall(init_default_flow_dissectors);
Linux 6.x block layer and io_uring tree(s)