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bpf: Use bpf_prog_run_pin_on_cpu() at simple call sites.
[linux-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;
a11c397c 117 int ret = 0;
d58e468b
PP		 118
119 net = current->nsproxy->net_ns;
120 mutex_lock(&flow_dissector_mutex);
a11c397c
SF		 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) {
719b78a5
JS		 131 if (ns == &init_net)
132 continue;
a11c397c
SF		 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
d58e468b
PP		 148 attached = rcu_dereference_protected(net->flow_dissector_prog,
149 lockdep_is_held(&flow_dissector_mutex));
719b78a5
JS		 150 if (attached == prog) {
151 /* The same program cannot be attached twice */
152 ret = -EINVAL;
a11c397c 153 goto out;
d58e468b
PP		 154 }
155 rcu_assign_pointer(net->flow_dissector_prog, prog);
719b78a5
JS		 156 if (attached)
157 bpf_prog_put(attached);
a11c397c 158out:
d58e468b 159 mutex_unlock(&flow_dissector_mutex);
a11c397c 160 return ret;
d58e468b
PP		 161}
162
163int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr)
164{
165 struct bpf_prog *attached;
166 struct net *net;
167
168 net = current->nsproxy->net_ns;
169 mutex_lock(&flow_dissector_mutex);
170 attached = rcu_dereference_protected(net->flow_dissector_prog,
171 lockdep_is_held(&flow_dissector_mutex));
172 if (!attached) {
173 mutex_unlock(&flow_dissector_mutex);
174 return -ENOENT;
175 }
d58e468b 176 RCU_INIT_POINTER(net->flow_dissector_prog, NULL);
db38de39 177 bpf_prog_put(attached);
d58e468b
PP		 178 mutex_unlock(&flow_dissector_mutex);
179 return 0;
180}
972d3876 181
357afe9c 182/**
6451b3f5
WC		 183 * __skb_flow_get_ports - extract the upper layer ports and return them
184 * @skb: sk_buff to extract the ports from
357afe9c
NA		 185 * @thoff: transport header offset
186 * @ip_proto: protocol for which to get port offset
6451b3f5
WC		 187 * @data: raw buffer pointer to the packet, if NULL use skb->data
188 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
357afe9c
NA		 189 *
190 * The function will try to retrieve the ports at offset thoff + poff where poff
191 * is the protocol port offset returned from proto_ports_offset
192 */
690e36e7
DM		 193__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
194 void *data, int hlen)
357afe9c
NA		 195{
196 int poff = proto_ports_offset(ip_proto);
197
690e36e7
DM		 198 if (!data) {
199 data = skb->data;
200 hlen = skb_headlen(skb);
201 }
202
357afe9c
NA		 203 if (poff >= 0) {
204 __be32 *ports, _ports;
205
690e36e7
DM		 206 ports = __skb_header_pointer(skb, thoff + poff,
207 sizeof(_ports), data, hlen, &_ports);
357afe9c
NA		 208 if (ports)
209 return *ports;
210 }
211
212 return 0;
213}
690e36e7 214EXPORT_SYMBOL(__skb_flow_get_ports);
357afe9c 215
5dec597e
MC		 216static bool icmp_has_id(u8 type)
217{
218 switch (type) {
219 case ICMP_ECHO:
220 case ICMP_ECHOREPLY:
221 case ICMP_TIMESTAMP:
222 case ICMP_TIMESTAMPREPLY:
223 case ICMPV6_ECHO_REQUEST:
224 case ICMPV6_ECHO_REPLY:
225 return true;
226 }
227
228 return false;
229}
230
231/**
232 * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields
233 * @skb: sk_buff to extract from
234 * @key_icmp: struct flow_dissector_key_icmp to fill
235 * @data: raw buffer pointer to the packet
6b3acfc3 236 * @thoff: offset to extract at
5dec597e
MC		 237 * @hlen: packet header length
238 */
239void skb_flow_get_icmp_tci(const struct sk_buff *skb,
240 struct flow_dissector_key_icmp *key_icmp,
241 void *data, int thoff, int hlen)
242{
243 struct icmphdr *ih, _ih;
244
245 ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih);
246 if (!ih)
247 return;
248
249 key_icmp->type = ih->type;
250 key_icmp->code = ih->code;
251
252 /* As we use 0 to signal that the Id field is not present,
253 * avoid confusion with packets without such field
254 */
255 if (icmp_has_id(ih->type))
256 key_icmp->id = ih->un.echo.id ? : 1;
257 else
258 key_icmp->id = 0;
259}
260EXPORT_SYMBOL(skb_flow_get_icmp_tci);
261
262/* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet
263 * using skb_flow_get_icmp_tci().
3b336d6f
MC		 264 */
265static void __skb_flow_dissect_icmp(const struct sk_buff *skb,
266 struct flow_dissector *flow_dissector,
267 void *target_container,
268 void *data, int thoff, int hlen)
269{
270 struct flow_dissector_key_icmp *key_icmp;
271
272 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP))
273 return;
274
275 key_icmp = skb_flow_dissector_target(flow_dissector,
276 FLOW_DISSECTOR_KEY_ICMP,
277 target_container);
5dec597e
MC		 278
279 skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen);
3b336d6f
MC		 280}
281
82828b88
JP		 282void skb_flow_dissect_meta(const struct sk_buff *skb,
283 struct flow_dissector *flow_dissector,
284 void *target_container)
285{
286 struct flow_dissector_key_meta *meta;
287
288 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
289 return;
290
291 meta = skb_flow_dissector_target(flow_dissector,
292 FLOW_DISSECTOR_KEY_META,
293 target_container);
294 meta->ingress_ifindex = skb->skb_iif;
295}
296EXPORT_SYMBOL(skb_flow_dissect_meta);
297
a38402bc
SH		 298static void
299skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
300 struct flow_dissector *flow_dissector,
301 void *target_container)
302{
303 struct flow_dissector_key_control *ctrl;
304
305 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
306 return;
307
308 ctrl = skb_flow_dissector_target(flow_dissector,
309 FLOW_DISSECTOR_KEY_ENC_CONTROL,
310 target_container);
311 ctrl->addr_type = type;
312}
313
75a56758
PB		 314void
315skb_flow_dissect_ct(const struct sk_buff *skb,
316 struct flow_dissector *flow_dissector,
317 void *target_container,
318 u16 *ctinfo_map,
319 size_t mapsize)
320{
321#if IS_ENABLED(CONFIG_NF_CONNTRACK)
322 struct flow_dissector_key_ct *key;
323 enum ip_conntrack_info ctinfo;
324 struct nf_conn_labels *cl;
325 struct nf_conn *ct;
326
327 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
328 return;
329
330 ct = nf_ct_get(skb, &ctinfo);
331 if (!ct)
332 return;
333
334 key = skb_flow_dissector_target(flow_dissector,
335 FLOW_DISSECTOR_KEY_CT,
336 target_container);
337
338 if (ctinfo < mapsize)
339 key->ct_state = ctinfo_map[ctinfo];
340#if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
341 key->ct_zone = ct->zone.id;
342#endif
343#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
344 key->ct_mark = ct->mark;
345#endif
346
347 cl = nf_ct_labels_find(ct);
348 if (cl)
349 memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
350#endif /* CONFIG_NF_CONNTRACK */
351}
352EXPORT_SYMBOL(skb_flow_dissect_ct);
353
62b32379
SH		 354void
355skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
356 struct flow_dissector *flow_dissector,
357 void *target_container)
a38402bc
SH		 358{
359 struct ip_tunnel_info *info;
360 struct ip_tunnel_key *key;
361
362 /* A quick check to see if there might be something to do. */
363 if (!dissector_uses_key(flow_dissector,
364 FLOW_DISSECTOR_KEY_ENC_KEYID) &&
365 !dissector_uses_key(flow_dissector,
366 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
367 !dissector_uses_key(flow_dissector,
368 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
369 !dissector_uses_key(flow_dissector,
370 FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
371 !dissector_uses_key(flow_dissector,
5544adb9
OG		 372 FLOW_DISSECTOR_KEY_ENC_PORTS) &&
373 !dissector_uses_key(flow_dissector,
92e2c405
SH		 374 FLOW_DISSECTOR_KEY_ENC_IP) &&
375 !dissector_uses_key(flow_dissector,
376 FLOW_DISSECTOR_KEY_ENC_OPTS))
a38402bc
SH		 377 return;
378
379 info = skb_tunnel_info(skb);
380 if (!info)
381 return;
382
383 key = &info->key;
384
385 switch (ip_tunnel_info_af(info)) {
386 case AF_INET:
387 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
388 flow_dissector,
389 target_container);
390 if (dissector_uses_key(flow_dissector,
391 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
392 struct flow_dissector_key_ipv4_addrs *ipv4;
393
394 ipv4 = skb_flow_dissector_target(flow_dissector,
395 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
396 target_container);
397 ipv4->src = key->u.ipv4.src;
398 ipv4->dst = key->u.ipv4.dst;
399 }
400 break;
401 case AF_INET6:
402 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
403 flow_dissector,
404 target_container);
405 if (dissector_uses_key(flow_dissector,
406 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
407 struct flow_dissector_key_ipv6_addrs *ipv6;
408
409 ipv6 = skb_flow_dissector_target(flow_dissector,
410 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
411 target_container);
412 ipv6->src = key->u.ipv6.src;
413 ipv6->dst = key->u.ipv6.dst;
414 }
415 break;
416 }
417
418 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
419 struct flow_dissector_key_keyid *keyid;
420
421 keyid = skb_flow_dissector_target(flow_dissector,
422 FLOW_DISSECTOR_KEY_ENC_KEYID,
423 target_container);
424 keyid->keyid = tunnel_id_to_key32(key->tun_id);
425 }
426
427 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
428 struct flow_dissector_key_ports *tp;
429
430 tp = skb_flow_dissector_target(flow_dissector,
431 FLOW_DISSECTOR_KEY_ENC_PORTS,
432 target_container);
433 tp->src = key->tp_src;
434 tp->dst = key->tp_dst;
435 }
5544adb9
OG		 436
437 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
438 struct flow_dissector_key_ip *ip;
439
440 ip = skb_flow_dissector_target(flow_dissector,
441 FLOW_DISSECTOR_KEY_ENC_IP,
442 target_container);
443 ip->tos = key->tos;
444 ip->ttl = key->ttl;
445 }
92e2c405
SH		 446
447 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
448 struct flow_dissector_key_enc_opts *enc_opt;
449
450 enc_opt = skb_flow_dissector_target(flow_dissector,
451 FLOW_DISSECTOR_KEY_ENC_OPTS,
452 target_container);
453
454 if (info->options_len) {
455 enc_opt->len = info->options_len;
456 ip_tunnel_info_opts_get(enc_opt->data, info);
457 enc_opt->dst_opt_type = info->key.tun_flags &
458 TUNNEL_OPTIONS_PRESENT;
459 }
460 }
a38402bc 461}
62b32379 462EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
a38402bc 463
4a5d6c8b
JP		 464static enum flow_dissect_ret
465__skb_flow_dissect_mpls(const struct sk_buff *skb,
466 struct flow_dissector *flow_dissector,
467 void *target_container, void *data, int nhoff, int hlen)
468{
469 struct flow_dissector_key_keyid *key_keyid;
470 struct mpls_label *hdr, _hdr[2];
029c1ecb 471 u32 entry, label;
4a5d6c8b
JP		 472
473 if (!dissector_uses_key(flow_dissector,
029c1ecb
BL		 474 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
475 !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
4a5d6c8b
JP		 476 return FLOW_DISSECT_RET_OUT_GOOD;
477
478 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
479 hlen, &_hdr);
480 if (!hdr)
481 return FLOW_DISSECT_RET_OUT_BAD;
482
029c1ecb
BL		 483 entry = ntohl(hdr[0].entry);
484 label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
485
486 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
487 struct flow_dissector_key_mpls *key_mpls;
488
489 key_mpls = skb_flow_dissector_target(flow_dissector,
490 FLOW_DISSECTOR_KEY_MPLS,
491 target_container);
492 key_mpls->mpls_label = label;
493 key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK)
494 >> MPLS_LS_TTL_SHIFT;
495 key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK)
496 >> MPLS_LS_TC_SHIFT;
497 key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK)
498 >> MPLS_LS_S_SHIFT;
499 }
500
501 if (label == MPLS_LABEL_ENTROPY) {
4a5d6c8b
JP		 502 key_keyid = skb_flow_dissector_target(flow_dissector,
503 FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
504 target_container);
505 key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK);
506 }
507 return FLOW_DISSECT_RET_OUT_GOOD;
508}
509
9bf881ff
JP		 510static enum flow_dissect_ret
511__skb_flow_dissect_arp(const struct sk_buff *skb,
512 struct flow_dissector *flow_dissector,
513 void *target_container, void *data, int nhoff, int hlen)
514{
515 struct flow_dissector_key_arp *key_arp;
516 struct {
517 unsigned char ar_sha[ETH_ALEN];
518 unsigned char ar_sip[4];
519 unsigned char ar_tha[ETH_ALEN];
520 unsigned char ar_tip[4];
521 } *arp_eth, _arp_eth;
522 const struct arphdr *arp;
6f14f443 523 struct arphdr _arp;
9bf881ff
JP		 524
525 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
526 return FLOW_DISSECT_RET_OUT_GOOD;
527
528 arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
529 hlen, &_arp);
530 if (!arp)
531 return FLOW_DISSECT_RET_OUT_BAD;
532
533 if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
534 arp->ar_pro != htons(ETH_P_IP) ||
535 arp->ar_hln != ETH_ALEN ||
536 arp->ar_pln != 4 ||
537 (arp->ar_op != htons(ARPOP_REPLY) &&
538 arp->ar_op != htons(ARPOP_REQUEST)))
539 return FLOW_DISSECT_RET_OUT_BAD;
540
541 arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
542 sizeof(_arp_eth), data,
543 hlen, &_arp_eth);
544 if (!arp_eth)
545 return FLOW_DISSECT_RET_OUT_BAD;
546
547 key_arp = skb_flow_dissector_target(flow_dissector,
548 FLOW_DISSECTOR_KEY_ARP,
549 target_container);
550
551 memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
552 memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
553
554 /* Only store the lower byte of the opcode;
555 * this covers ARPOP_REPLY and ARPOP_REQUEST.
556 */
557 key_arp->op = ntohs(arp->ar_op) & 0xff;
558
559 ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
560 ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
561
562 return FLOW_DISSECT_RET_OUT_GOOD;
563}
564
7c92de8e
JP		 565static enum flow_dissect_ret
566__skb_flow_dissect_gre(const struct sk_buff *skb,
567 struct flow_dissector_key_control *key_control,
568 struct flow_dissector *flow_dissector,
569 void *target_container, void *data,
570 __be16 *p_proto, int *p_nhoff, int *p_hlen,
571 unsigned int flags)
572{
573 struct flow_dissector_key_keyid *key_keyid;
574 struct gre_base_hdr *hdr, _hdr;
575 int offset = 0;
576 u16 gre_ver;
577
578 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
579 data, *p_hlen, &_hdr);
580 if (!hdr)
581 return FLOW_DISSECT_RET_OUT_BAD;
582
583 /* Only look inside GRE without routing */
584 if (hdr->flags & GRE_ROUTING)
585 return FLOW_DISSECT_RET_OUT_GOOD;
586
587 /* Only look inside GRE for version 0 and 1 */
588 gre_ver = ntohs(hdr->flags & GRE_VERSION);
589 if (gre_ver > 1)
590 return FLOW_DISSECT_RET_OUT_GOOD;
591
592 *p_proto = hdr->protocol;
593 if (gre_ver) {
594 /* Version1 must be PPTP, and check the flags */
595 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
596 return FLOW_DISSECT_RET_OUT_GOOD;
597 }
598
599 offset += sizeof(struct gre_base_hdr);
600
601 if (hdr->flags & GRE_CSUM)
c593642c
PB		 602 offset += sizeof_field(struct gre_full_hdr, csum) +
603 sizeof_field(struct gre_full_hdr, reserved1);
7c92de8e
JP		 604
605 if (hdr->flags & GRE_KEY) {
606 const __be32 *keyid;
607 __be32 _keyid;
608
609 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
610 sizeof(_keyid),
611 data, *p_hlen, &_keyid);
612 if (!keyid)
613 return FLOW_DISSECT_RET_OUT_BAD;
614
615 if (dissector_uses_key(flow_dissector,
616 FLOW_DISSECTOR_KEY_GRE_KEYID)) {
617 key_keyid = skb_flow_dissector_target(flow_dissector,
618 FLOW_DISSECTOR_KEY_GRE_KEYID,
619 target_container);
620 if (gre_ver == 0)
621 key_keyid->keyid = *keyid;
622 else
623 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
624 }
c593642c 625 offset += sizeof_field(struct gre_full_hdr, key);
7c92de8e
JP		 626 }
627
628 if (hdr->flags & GRE_SEQ)
c593642c 629 offset += sizeof_field(struct pptp_gre_header, seq);
7c92de8e
JP		 630
631 if (gre_ver == 0) {
632 if (*p_proto == htons(ETH_P_TEB)) {
633 const struct ethhdr *eth;
634 struct ethhdr _eth;
635
636 eth = __skb_header_pointer(skb, *p_nhoff + offset,
637 sizeof(_eth),
638 data, *p_hlen, &_eth);
639 if (!eth)
640 return FLOW_DISSECT_RET_OUT_BAD;
641 *p_proto = eth->h_proto;
642 offset += sizeof(*eth);
643
644 /* Cap headers that we access via pointers at the
645 * end of the Ethernet header as our maximum alignment
646 * at that point is only 2 bytes.
647 */
648 if (NET_IP_ALIGN)
649 *p_hlen = *p_nhoff + offset;
650 }
651 } else { /* version 1, must be PPTP */
652 u8 _ppp_hdr[PPP_HDRLEN];
653 u8 *ppp_hdr;
654
655 if (hdr->flags & GRE_ACK)
c593642c 656 offset += sizeof_field(struct pptp_gre_header, ack);
7c92de8e
JP		 657
658 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
659 sizeof(_ppp_hdr),
660 data, *p_hlen, _ppp_hdr);
661 if (!ppp_hdr)
662 return FLOW_DISSECT_RET_OUT_BAD;
663
664 switch (PPP_PROTOCOL(ppp_hdr)) {
665 case PPP_IP:
666 *p_proto = htons(ETH_P_IP);
667 break;
668 case PPP_IPV6:
669 *p_proto = htons(ETH_P_IPV6);
670 break;
671 default:
672 /* Could probably catch some more like MPLS */
673 break;
674 }
675
676 offset += PPP_HDRLEN;
677 }
678
679 *p_nhoff += offset;
680 key_control->flags |= FLOW_DIS_ENCAPSULATION;
681 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
682 return FLOW_DISSECT_RET_OUT_GOOD;
683
3a1214e8 684 return FLOW_DISSECT_RET_PROTO_AGAIN;
7c92de8e
JP		 685}
686
5b0890a9
SE		 687/**
688 * __skb_flow_dissect_batadv() - dissect batman-adv header
689 * @skb: sk_buff to with the batman-adv header
690 * @key_control: flow dissectors control key
691 * @data: raw buffer pointer to the packet, if NULL use skb->data
692 * @p_proto: pointer used to update the protocol to process next
693 * @p_nhoff: pointer used to update inner network header offset
694 * @hlen: packet header length
695 * @flags: any combination of FLOW_DISSECTOR_F_*
696 *
697 * ETH_P_BATMAN packets are tried to be dissected. Only
698 * &struct batadv_unicast packets are actually processed because they contain an
699 * inner ethernet header and are usually followed by actual network header. This
700 * allows the flow dissector to continue processing the packet.
701 *
702 * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
703 * FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
704 * otherwise FLOW_DISSECT_RET_OUT_BAD
705 */
706static enum flow_dissect_ret
707__skb_flow_dissect_batadv(const struct sk_buff *skb,
708 struct flow_dissector_key_control *key_control,
709 void *data, __be16 *p_proto, int *p_nhoff, int hlen,
710 unsigned int flags)
711{
712 struct {
713 struct batadv_unicast_packet batadv_unicast;
714 struct ethhdr eth;
715 } *hdr, _hdr;
716
717 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
718 &_hdr);
719 if (!hdr)
720 return FLOW_DISSECT_RET_OUT_BAD;
721
722 if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
723 return FLOW_DISSECT_RET_OUT_BAD;
724
725 if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
726 return FLOW_DISSECT_RET_OUT_BAD;
727
728 *p_proto = hdr->eth.h_proto;
729 *p_nhoff += sizeof(*hdr);
730
731 key_control->flags |= FLOW_DIS_ENCAPSULATION;
732 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
733 return FLOW_DISSECT_RET_OUT_GOOD;
734
735 return FLOW_DISSECT_RET_PROTO_AGAIN;
736}
737
ac4bb5de
JP		 738static void
739__skb_flow_dissect_tcp(const struct sk_buff *skb,
740 struct flow_dissector *flow_dissector,
741 void *target_container, void *data, int thoff, int hlen)
742{
743 struct flow_dissector_key_tcp *key_tcp;
744 struct tcphdr *th, _th;
745
746 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
747 return;
748
749 th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
750 if (!th)
751 return;
752
753 if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
754 return;
755
756 key_tcp = skb_flow_dissector_target(flow_dissector,
757 FLOW_DISSECTOR_KEY_TCP,
758 target_container);
759 key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
760}
761
8ffb055b
YK		 762static void
763__skb_flow_dissect_ports(const struct sk_buff *skb,
764 struct flow_dissector *flow_dissector,
765 void *target_container, void *data, int nhoff,
766 u8 ip_proto, int hlen)
767{
768 enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX;
769 struct flow_dissector_key_ports *key_ports;
770
771 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
772 dissector_ports = FLOW_DISSECTOR_KEY_PORTS;
773 else if (dissector_uses_key(flow_dissector,
774 FLOW_DISSECTOR_KEY_PORTS_RANGE))
775 dissector_ports = FLOW_DISSECTOR_KEY_PORTS_RANGE;
776
777 if (dissector_ports == FLOW_DISSECTOR_KEY_MAX)
778 return;
779
780 key_ports = skb_flow_dissector_target(flow_dissector,
781 dissector_ports,
782 target_container);
783 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
784 data, hlen);
785}
786
518d8a2e
OG		 787static void
788__skb_flow_dissect_ipv4(const struct sk_buff *skb,
789 struct flow_dissector *flow_dissector,
790 void *target_container, void *data, const struct iphdr *iph)
791{
792 struct flow_dissector_key_ip *key_ip;
793
794 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
795 return;
796
797 key_ip = skb_flow_dissector_target(flow_dissector,
798 FLOW_DISSECTOR_KEY_IP,
799 target_container);
800 key_ip->tos = iph->tos;
801 key_ip->ttl = iph->ttl;
802}
803
804static void
805__skb_flow_dissect_ipv6(const struct sk_buff *skb,
806 struct flow_dissector *flow_dissector,
807 void *target_container, void *data, const struct ipv6hdr *iph)
808{
809 struct flow_dissector_key_ip *key_ip;
810
811 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
812 return;
813
814 key_ip = skb_flow_dissector_target(flow_dissector,
815 FLOW_DISSECTOR_KEY_IP,
816 target_container);
817 key_ip->tos = ipv6_get_dsfield(iph);
818 key_ip->ttl = iph->hop_limit;
819}
820
1eed4dfb
TH		 821/* Maximum number of protocol headers that can be parsed in
822 * __skb_flow_dissect
823 */
824#define MAX_FLOW_DISSECT_HDRS 15
825
826static bool skb_flow_dissect_allowed(int *num_hdrs)
827{
828 ++*num_hdrs;
829
830 return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
831}
832
d58e468b
PP		 833static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
834 struct flow_dissector *flow_dissector,
835 void *target_container)
836{
59fb9b62 837 struct flow_dissector_key_ports *key_ports = NULL;
d58e468b
PP		 838 struct flow_dissector_key_control *key_control;
839 struct flow_dissector_key_basic *key_basic;
840 struct flow_dissector_key_addrs *key_addrs;
71c99e32 841 struct flow_dissector_key_tags *key_tags;
d58e468b
PP		 842
843 key_control = skb_flow_dissector_target(flow_dissector,
844 FLOW_DISSECTOR_KEY_CONTROL,
845 target_container);
846 key_control->thoff = flow_keys->thoff;
847 if (flow_keys->is_frag)
848 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
849 if (flow_keys->is_first_frag)
850 key_control->flags |= FLOW_DIS_FIRST_FRAG;
851 if (flow_keys->is_encap)
852 key_control->flags |= FLOW_DIS_ENCAPSULATION;
853
854 key_basic = skb_flow_dissector_target(flow_dissector,
855 FLOW_DISSECTOR_KEY_BASIC,
856 target_container);
857 key_basic->n_proto = flow_keys->n_proto;
858 key_basic->ip_proto = flow_keys->ip_proto;
859
860 if (flow_keys->addr_proto == ETH_P_IP &&
861 dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
862 key_addrs = skb_flow_dissector_target(flow_dissector,
863 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
864 target_container);
865 key_addrs->v4addrs.src = flow_keys->ipv4_src;
866 key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
867 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
868 } else if (flow_keys->addr_proto == ETH_P_IPV6 &&
869 dissector_uses_key(flow_dissector,
870 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
871 key_addrs = skb_flow_dissector_target(flow_dissector,
872 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
873 target_container);
874 memcpy(&key_addrs->v6addrs, &flow_keys->ipv6_src,
875 sizeof(key_addrs->v6addrs));
876 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
877 }
878
59fb9b62 879 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
d58e468b
PP		 880 key_ports = skb_flow_dissector_target(flow_dissector,
881 FLOW_DISSECTOR_KEY_PORTS,
882 target_container);
59fb9b62
YK		 883 else if (dissector_uses_key(flow_dissector,
884 FLOW_DISSECTOR_KEY_PORTS_RANGE))
885 key_ports = skb_flow_dissector_target(flow_dissector,
886 FLOW_DISSECTOR_KEY_PORTS_RANGE,
887 target_container);
888
889 if (key_ports) {
d58e468b
PP		 890 key_ports->src = flow_keys->sport;
891 key_ports->dst = flow_keys->dport;
892 }
71c99e32
SF		 893
894 if (dissector_uses_key(flow_dissector,
895 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
896 key_tags = skb_flow_dissector_target(flow_dissector,
897 FLOW_DISSECTOR_KEY_FLOW_LABEL,
898 target_container);
899 key_tags->flow_label = ntohl(flow_keys->flow_label);
900 }
d58e468b
PP		 901}
902
089b19a9 903bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
086f9568 904 __be16 proto, int nhoff, int hlen, unsigned int flags)
089b19a9
SF		 905{
906 struct bpf_flow_keys *flow_keys = ctx->flow_keys;
907 u32 result;
c8aa7038
SF		 908
909 /* Pass parameters to the BPF program */
910 memset(flow_keys, 0, sizeof(*flow_keys));
089b19a9
SF		 911 flow_keys->n_proto = proto;
912 flow_keys->nhoff = nhoff;
c8aa7038
SF		 913 flow_keys->thoff = flow_keys->nhoff;
914
086f9568
SF		 915 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
916 (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
917 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
918 (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
919 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
920 (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
921 flow_keys->flags = flags;
922
3d9f773c 923 result = bpf_prog_run_pin_on_cpu(prog, ctx);
c8aa7038 924
089b19a9 925 flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
c8aa7038 926 flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
089b19a9 927 flow_keys->nhoff, hlen);
c8aa7038
SF		 928
929 return result == BPF_OK;
930}
931
453a940e
WC		 932/**
933 * __skb_flow_dissect - extract the flow_keys struct and return it
3cbf4ffb 934 * @net: associated network namespace, derived from @skb if NULL
453a940e 935 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
06635a35
JP		 936 * @flow_dissector: list of keys to dissect
937 * @target_container: target structure to put dissected values into
453a940e
WC		 938 * @data: raw buffer pointer to the packet, if NULL use skb->data
939 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
940 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
941 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
d79b3baf 942 * @flags: flags that control the dissection process, e.g.
1cc26450 943 * FLOW_DISSECTOR_F_STOP_AT_ENCAP.
453a940e 944 *
06635a35
JP		 945 * The function will try to retrieve individual keys into target specified
946 * by flow_dissector from either the skbuff or a raw buffer specified by the
947 * rest parameters.
948 *
949 * Caller must take care of zeroing target container memory.
453a940e 950 */
3cbf4ffb
SF		 951bool __skb_flow_dissect(const struct net *net,
952 const struct sk_buff *skb,
06635a35
JP		 953 struct flow_dissector *flow_dissector,
954 void *target_container,
cd79a238
TH		 955 void *data, __be16 proto, int nhoff, int hlen,
956 unsigned int flags)
0744dd00 957{
42aecaa9 958 struct flow_dissector_key_control *key_control;
06635a35
JP		 959 struct flow_dissector_key_basic *key_basic;
960 struct flow_dissector_key_addrs *key_addrs;
d34af823 961 struct flow_dissector_key_tags *key_tags;
f6a66927 962 struct flow_dissector_key_vlan *key_vlan;
9b52e3f2 963 struct bpf_prog *attached = NULL;
3a1214e8 964 enum flow_dissect_ret fdret;
24c590e3 965 enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
1eed4dfb 966 int num_hdrs = 0;
8e690ffd 967 u8 ip_proto = 0;
34fad54c 968 bool ret;
0744dd00 969
690e36e7
DM		 970 if (!data) {
971 data = skb->data;
d5709f7a
HHZ		 972 proto = skb_vlan_tag_present(skb) ?
973 skb->vlan_proto : skb->protocol;
453a940e 974 nhoff = skb_network_offset(skb);
690e36e7 975 hlen = skb_headlen(skb);
2d571645 976#if IS_ENABLED(CONFIG_NET_DSA)
8bef0af0
AL		 977 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
978 proto == htons(ETH_P_XDSA))) {
43e66528 979 const struct dsa_device_ops *ops;
8bef0af0 980 int offset = 0;
43e66528
JC		 981
982 ops = skb->dev->dsa_ptr->tag_ops;
983 if (ops->flow_dissect &&
984 !ops->flow_dissect(skb, &proto, &offset)) {
985 hlen -= offset;
986 nhoff += offset;
987 }
988 }
2d571645 989#endif
690e36e7
DM		 990 }
991
42aecaa9
TH		 992 /* It is ensured by skb_flow_dissector_init() that control key will
993 * be always present.
994 */
995 key_control = skb_flow_dissector_target(flow_dissector,
996 FLOW_DISSECTOR_KEY_CONTROL,
997 target_container);
998
06635a35
JP		 999 /* It is ensured by skb_flow_dissector_init() that basic key will
1000 * be always present.
1001 */
1002 key_basic = skb_flow_dissector_target(flow_dissector,
1003 FLOW_DISSECTOR_KEY_BASIC,
1004 target_container);
0744dd00 1005
d0e13a14 1006 if (skb) {
3cbf4ffb
SF		 1007 if (!net) {
1008 if (skb->dev)
1009 net = dev_net(skb->dev);
1010 else if (skb->sk)
1011 net = sock_net(skb->sk);
3cbf4ffb 1012 }
9b52e3f2 1013 }
c8aa7038 1014
9b52e3f2
SF		 1015 WARN_ON_ONCE(!net);
1016 if (net) {
1017 rcu_read_lock();
a11c397c
SF		 1018 attached = rcu_dereference(init_net.flow_dissector_prog);
1019
1020 if (!attached)
1021 attached = rcu_dereference(net->flow_dissector_prog);
d58e468b 1022
c8aa7038 1023 if (attached) {
9b52e3f2
SF		 1024 struct bpf_flow_keys flow_keys;
1025 struct bpf_flow_dissector ctx = {
1026 .flow_keys = &flow_keys,
1027 .data = data,
1028 .data_end = data + hlen,
1029 };
1030 __be16 n_proto = proto;
1031
1032 if (skb) {
1033 ctx.skb = skb;
1034 /* we can't use 'proto' in the skb case
1035 * because it might be set to skb->vlan_proto
1036 * which has been pulled from the data
1037 */
1038 n_proto = skb->protocol;
1039 }
1040
1041 ret = bpf_flow_dissect(attached, &ctx, n_proto, nhoff,
086f9568 1042 hlen, flags);
c8aa7038
SF		 1043 __skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1044 target_container);
1045 rcu_read_unlock();
1046 return ret;
1047 }
d58e468b 1048 rcu_read_unlock();
d58e468b 1049 }
d58e468b 1050
20a17bf6
DM		 1051 if (dissector_uses_key(flow_dissector,
1052 FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
67a900cc
JP		 1053 struct ethhdr *eth = eth_hdr(skb);
1054 struct flow_dissector_key_eth_addrs *key_eth_addrs;
1055
1056 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1057 FLOW_DISSECTOR_KEY_ETH_ADDRS,
1058 target_container);
1059 memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
1060 }
1061
c5ef188e 1062proto_again:
3a1214e8
TH		 1063 fdret = FLOW_DISSECT_RET_CONTINUE;
1064
0744dd00 1065 switch (proto) {
2b8837ae 1066 case htons(ETH_P_IP): {
0744dd00
ED		 1067 const struct iphdr *iph;
1068 struct iphdr _iph;
3a1214e8 1069
690e36e7 1070 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
3a1214e8
TH		 1071 if (!iph || iph->ihl < 5) {
1072 fdret = FLOW_DISSECT_RET_OUT_BAD;
1073 break;
1074 }
1075
3797d3e8 1076 nhoff += iph->ihl * 4;
0744dd00 1077
3797d3e8 1078 ip_proto = iph->protocol;
3797d3e8 1079
918c023f
AD		 1080 if (dissector_uses_key(flow_dissector,
1081 FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1082 key_addrs = skb_flow_dissector_target(flow_dissector,
1083 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1084 target_container);
1085
1086 memcpy(&key_addrs->v4addrs, &iph->saddr,
1087 sizeof(key_addrs->v4addrs));
1088 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1089 }
807e165d
TH		 1090
1091 if (ip_is_fragment(iph)) {
4b36993d 1092 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
807e165d
TH		 1093
1094 if (iph->frag_off & htons(IP_OFFSET)) {
3a1214e8
TH		 1095 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1096 break;
807e165d 1097 } else {
4b36993d 1098 key_control->flags |= FLOW_DIS_FIRST_FRAG;
3a1214e8
TH		 1099 if (!(flags &
1100 FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1101 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1102 break;
1103 }
807e165d
TH		 1104 }
1105 }
1106
518d8a2e
OG		 1107 __skb_flow_dissect_ipv4(skb, flow_dissector,
1108 target_container, data, iph);
1109
0744dd00
ED		 1110 break;
1111 }
2b8837ae 1112 case htons(ETH_P_IPV6): {
0744dd00
ED		 1113 const struct ipv6hdr *iph;
1114 struct ipv6hdr _iph;
19469a87 1115
690e36e7 1116 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
3a1214e8
TH		 1117 if (!iph) {
1118 fdret = FLOW_DISSECT_RET_OUT_BAD;
1119 break;
1120 }
0744dd00
ED		 1121
1122 ip_proto = iph->nexthdr;
0744dd00 1123 nhoff += sizeof(struct ipv6hdr);
19469a87 1124
20a17bf6
DM		 1125 if (dissector_uses_key(flow_dissector,
1126 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
b3c3106c
AD		 1127 key_addrs = skb_flow_dissector_target(flow_dissector,
1128 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1129 target_container);
5af7fb6e 1130
b3c3106c
AD		 1131 memcpy(&key_addrs->v6addrs, &iph->saddr,
1132 sizeof(key_addrs->v6addrs));
c3f83241 1133 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
b924933c 1134 }
87ee9e52 1135
461547f3
AD		 1136 if ((dissector_uses_key(flow_dissector,
1137 FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1138 (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1139 ip6_flowlabel(iph)) {
1140 __be32 flow_label = ip6_flowlabel(iph);
1141
20a17bf6
DM		 1142 if (dissector_uses_key(flow_dissector,
1143 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
87ee9e52
TH		 1144 key_tags = skb_flow_dissector_target(flow_dissector,
1145 FLOW_DISSECTOR_KEY_FLOW_LABEL,
1146 target_container);
1147 key_tags->flow_label = ntohl(flow_label);
12c227ec 1148 }
3a1214e8
TH		 1149 if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1150 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1151 break;
1152 }
19469a87
TH		 1153 }
1154
518d8a2e
OG		 1155 __skb_flow_dissect_ipv6(skb, flow_dissector,
1156 target_container, data, iph);
1157
0744dd00
ED		 1158 break;
1159 }
2b8837ae
JP		 1160 case htons(ETH_P_8021AD):
1161 case htons(ETH_P_8021Q): {
24c590e3 1162 const struct vlan_hdr *vlan = NULL;
bc72f3dd 1163 struct vlan_hdr _vlan;
2064c3d4 1164 __be16 saved_vlan_tpid = proto;
0744dd00 1165
24c590e3
JL		 1166 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1167 skb && skb_vlan_tag_present(skb)) {
d5709f7a 1168 proto = skb->protocol;
24c590e3 1169 } else {
d5709f7a
HHZ		 1170 vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1171 data, hlen, &_vlan);
3a1214e8
TH		 1172 if (!vlan) {
1173 fdret = FLOW_DISSECT_RET_OUT_BAD;
1174 break;
1175 }
1176
d5709f7a
HHZ		 1177 proto = vlan->h_vlan_encapsulated_proto;
1178 nhoff += sizeof(*vlan);
d5709f7a 1179 }
0744dd00 1180
24c590e3
JL		 1181 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1182 dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1183 } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1184 dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1185 } else {
1186 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1187 break;
1188 }
1189
1190 if (dissector_uses_key(flow_dissector, dissector_vlan)) {
f6a66927 1191 key_vlan = skb_flow_dissector_target(flow_dissector,
24c590e3 1192 dissector_vlan,
d34af823
TH		 1193 target_container);
1194
24c590e3 1195 if (!vlan) {
f6a66927 1196 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
9b319148 1197 key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
f6a66927
HHZ		 1198 } else {
1199 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
d5709f7a 1200 VLAN_VID_MASK;
f6a66927
HHZ		 1201 key_vlan->vlan_priority =
1202 (ntohs(vlan->h_vlan_TCI) &
1203 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1204 }
2064c3d4 1205 key_vlan->vlan_tpid = saved_vlan_tpid;
d34af823
TH		 1206 }
1207
3a1214e8
TH		 1208 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1209 break;
0744dd00 1210 }
2b8837ae 1211 case htons(ETH_P_PPP_SES): {
0744dd00
ED		 1212 struct {
1213 struct pppoe_hdr hdr;
1214 __be16 proto;
1215 } *hdr, _hdr;
690e36e7 1216 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
3a1214e8
TH		 1217 if (!hdr) {
1218 fdret = FLOW_DISSECT_RET_OUT_BAD;
1219 break;
1220 }
1221
0744dd00
ED		 1222 proto = hdr->proto;
1223 nhoff += PPPOE_SES_HLEN;
1224 switch (proto) {
2b8837ae 1225 case htons(PPP_IP):
3a1214e8
TH		 1226 proto = htons(ETH_P_IP);
1227 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1228 break;
2b8837ae 1229 case htons(PPP_IPV6):
3a1214e8
TH		 1230 proto = htons(ETH_P_IPV6);
1231 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1232 break;
0744dd00 1233 default:
3a1214e8
TH		 1234 fdret = FLOW_DISSECT_RET_OUT_BAD;
1235 break;
0744dd00 1236 }
3a1214e8 1237 break;
0744dd00 1238 }
08bfc9cb 1239 case htons(ETH_P_TIPC): {
8d6e79d3
JM		 1240 struct tipc_basic_hdr *hdr, _hdr;
1241
1242 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1243 data, hlen, &_hdr);
3a1214e8
TH		 1244 if (!hdr) {
1245 fdret = FLOW_DISSECT_RET_OUT_BAD;
1246 break;
1247 }
06635a35 1248
20a17bf6 1249 if (dissector_uses_key(flow_dissector,
8d6e79d3 1250 FLOW_DISSECTOR_KEY_TIPC)) {
06635a35 1251 key_addrs = skb_flow_dissector_target(flow_dissector,
8d6e79d3 1252 FLOW_DISSECTOR_KEY_TIPC,
06635a35 1253 target_container);
8d6e79d3
JM		 1254 key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1255 key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
06635a35 1256 }
3a1214e8
TH		 1257 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1258 break;
08bfc9cb 1259 }
b3baa0fb
TH		 1260
1261 case htons(ETH_P_MPLS_UC):
4a5d6c8b 1262 case htons(ETH_P_MPLS_MC):
3a1214e8 1263 fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
4a5d6c8b 1264 target_container, data,
3a1214e8
TH		 1265 nhoff, hlen);
1266 break;
56193d1b 1267 case htons(ETH_P_FCOE):
3a1214e8
TH		 1268 if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1269 fdret = FLOW_DISSECT_RET_OUT_BAD;
1270 break;
1271 }
224516b3
AD		 1272
1273 nhoff += FCOE_HEADER_LEN;
3a1214e8
TH		 1274 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1275 break;
55733350
SH		 1276
1277 case htons(ETH_P_ARP):
9bf881ff 1278 case htons(ETH_P_RARP):
3a1214e8 1279 fdret = __skb_flow_dissect_arp(skb, flow_dissector,
9bf881ff 1280 target_container, data,
3a1214e8
TH		 1281 nhoff, hlen);
1282 break;
1283
5b0890a9
SE		 1284 case htons(ETH_P_BATMAN):
1285 fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1286 &proto, &nhoff, hlen, flags);
1287 break;
1288
3a1214e8
TH		 1289 default:
1290 fdret = FLOW_DISSECT_RET_OUT_BAD;
1291 break;
1292 }
1293
1294 /* Process result of proto processing */
1295 switch (fdret) {
1296 case FLOW_DISSECT_RET_OUT_GOOD:
1297 goto out_good;
1298 case FLOW_DISSECT_RET_PROTO_AGAIN:
1eed4dfb
TH		 1299 if (skb_flow_dissect_allowed(&num_hdrs))
1300 goto proto_again;
1301 goto out_good;
3a1214e8
TH		 1302 case FLOW_DISSECT_RET_CONTINUE:
1303 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1304 break;
1305 case FLOW_DISSECT_RET_OUT_BAD:
0744dd00 1306 default:
a6e544b0 1307 goto out_bad;
0744dd00
ED		 1308 }
1309
6a74fcf4 1310ip_proto_again:
3a1214e8
TH		 1311 fdret = FLOW_DISSECT_RET_CONTINUE;
1312
0744dd00 1313 switch (ip_proto) {
7c92de8e 1314 case IPPROTO_GRE:
3a1214e8 1315 fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
7c92de8e 1316 target_container, data,
3a1214e8
TH		 1317 &proto, &nhoff, &hlen, flags);
1318 break;
1319
6a74fcf4
TH		 1320 case NEXTHDR_HOP:
1321 case NEXTHDR_ROUTING:
1322 case NEXTHDR_DEST: {
1323 u8 _opthdr[2], *opthdr;
1324
1325 if (proto != htons(ETH_P_IPV6))
1326 break;
1327
1328 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1329 data, hlen, &_opthdr);
3a1214e8
TH		 1330 if (!opthdr) {
1331 fdret = FLOW_DISSECT_RET_OUT_BAD;
1332 break;
1333 }
6a74fcf4 1334
1e98a0f0
ED		 1335 ip_proto = opthdr[0];
1336 nhoff += (opthdr[1] + 1) << 3;
6a74fcf4 1337
3a1214e8
TH		 1338 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1339 break;
6a74fcf4 1340 }
b840f28b
TH		 1341 case NEXTHDR_FRAGMENT: {
1342 struct frag_hdr _fh, *fh;
1343
1344 if (proto != htons(ETH_P_IPV6))
1345 break;
1346
1347 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1348 data, hlen, &_fh);
1349
3a1214e8
TH		 1350 if (!fh) {
1351 fdret = FLOW_DISSECT_RET_OUT_BAD;
1352 break;
1353 }
b840f28b 1354
4b36993d 1355 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
b840f28b
TH		 1356
1357 nhoff += sizeof(_fh);
43d2ccb3 1358 ip_proto = fh->nexthdr;
b840f28b
TH		 1359
1360 if (!(fh->frag_off & htons(IP6_OFFSET))) {
4b36993d 1361 key_control->flags |= FLOW_DIS_FIRST_FRAG;
3a1214e8
TH		 1362 if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1363 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1364 break;
1365 }
b840f28b 1366 }
3a1214e8
TH		 1367
1368 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1369 break;
b840f28b 1370 }
0744dd00 1371 case IPPROTO_IPIP:
fca41895 1372 proto = htons(ETH_P_IP);
823b9693 1373
4b36993d 1374 key_control->flags |= FLOW_DIS_ENCAPSULATION;
3a1214e8
TH		 1375 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1376 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1377 break;
1378 }
1379
1380 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1381 break;
823b9693 1382
b438f940
TH		 1383 case IPPROTO_IPV6:
1384 proto = htons(ETH_P_IPV6);
823b9693 1385
4b36993d 1386 key_control->flags |= FLOW_DIS_ENCAPSULATION;
3a1214e8
TH		 1387 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1388 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1389 break;
1390 }
1391
1392 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1393 break;
1394
823b9693 1395
b3baa0fb
TH		 1396 case IPPROTO_MPLS:
1397 proto = htons(ETH_P_MPLS_UC);
3a1214e8
TH		 1398 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1399 break;
1400
ac4bb5de
JP		 1401 case IPPROTO_TCP:
1402 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1403 data, nhoff, hlen);
1404 break;
3a1214e8 1405
3b336d6f
MC		 1406 case IPPROTO_ICMP:
1407 case IPPROTO_ICMPV6:
1408 __skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1409 data, nhoff, hlen);
1410 break;
1411
0744dd00
ED		 1412 default:
1413 break;
1414 }
1415
8ffb055b
YK		 1416 if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT))
1417 __skb_flow_dissect_ports(skb, flow_dissector, target_container,
1418 data, nhoff, ip_proto, hlen);
5af7fb6e 1419
3a1214e8
TH		 1420 /* Process result of IP proto processing */
1421 switch (fdret) {
1422 case FLOW_DISSECT_RET_PROTO_AGAIN:
1eed4dfb
TH		 1423 if (skb_flow_dissect_allowed(&num_hdrs))
1424 goto proto_again;
1425 break;
3a1214e8 1426 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1eed4dfb
TH		 1427 if (skb_flow_dissect_allowed(&num_hdrs))
1428 goto ip_proto_again;
1429 break;
3a1214e8
TH		 1430 case FLOW_DISSECT_RET_OUT_GOOD:
1431 case FLOW_DISSECT_RET_CONTINUE:
1432 break;
1433 case FLOW_DISSECT_RET_OUT_BAD:
1434 default:
1435 goto out_bad;
1436 }
1437
a6e544b0
TH		 1438out_good:
1439 ret = true;
1440
34fad54c 1441out:
d0c081b4 1442 key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
a6e544b0
TH		 1443 key_basic->n_proto = proto;
1444 key_basic->ip_proto = ip_proto;
a6e544b0
TH		 1445
1446 return ret;
34fad54c
ED		 1447
1448out_bad:
1449 ret = false;
34fad54c 1450 goto out;
0744dd00 1451}
690e36e7 1452EXPORT_SYMBOL(__skb_flow_dissect);
441d9d32 1453
55667441 1454static siphash_key_t hashrnd __read_mostly;
66415cf8
HFS		 1455static __always_inline void __flow_hash_secret_init(void)
1456{
1457 net_get_random_once(&hashrnd, sizeof(hashrnd));
1458}
1459
55667441 1460static const void *flow_keys_hash_start(const struct flow_keys *flow)
42aecaa9 1461{
55667441
ED		 1462 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1463 return &flow->FLOW_KEYS_HASH_START_FIELD;
42aecaa9
TH		 1464}
1465
20a17bf6 1466static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
42aecaa9 1467{
c3f83241 1468 size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
d31e9558 1469
42aecaa9 1470 BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
c3f83241
TH		 1471
1472 switch (flow->control.addr_type) {
1473 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1474 diff -= sizeof(flow->addrs.v4addrs);
1475 break;
1476 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1477 diff -= sizeof(flow->addrs.v6addrs);
1478 break;
8d6e79d3
JM		 1479 case FLOW_DISSECTOR_KEY_TIPC:
1480 diff -= sizeof(flow->addrs.tipckey);
9f249089 1481 break;
c3f83241 1482 }
55667441 1483 return sizeof(*flow) - diff;
c3f83241
TH		 1484}
1485
1486__be32 flow_get_u32_src(const struct flow_keys *flow)
1487{
1488 switch (flow->control.addr_type) {
1489 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1490 return flow->addrs.v4addrs.src;
1491 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1492 return (__force __be32)ipv6_addr_hash(
1493 &flow->addrs.v6addrs.src);
8d6e79d3
JM		 1494 case FLOW_DISSECTOR_KEY_TIPC:
1495 return flow->addrs.tipckey.key;
c3f83241
TH		 1496 default:
1497 return 0;
1498 }
1499}
1500EXPORT_SYMBOL(flow_get_u32_src);
1501
1502__be32 flow_get_u32_dst(const struct flow_keys *flow)
1503{
1504 switch (flow->control.addr_type) {
1505 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1506 return flow->addrs.v4addrs.dst;
1507 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1508 return (__force __be32)ipv6_addr_hash(
1509 &flow->addrs.v6addrs.dst);
1510 default:
1511 return 0;
1512 }
1513}
1514EXPORT_SYMBOL(flow_get_u32_dst);
1515
98298e6c
MC		 1516/* Sort the source and destination IP (and the ports if the IP are the same),
1517 * to have consistent hash within the two directions
1518 */
c3f83241
TH		 1519static inline void __flow_hash_consistentify(struct flow_keys *keys)
1520{
1521 int addr_diff, i;
1522
1523 switch (keys->control.addr_type) {
1524 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1525 addr_diff = (__force u32)keys->addrs.v4addrs.dst -
1526 (__force u32)keys->addrs.v4addrs.src;
1527 if ((addr_diff < 0) ||
1528 (addr_diff == 0 &&
1529 ((__force u16)keys->ports.dst <
1530 (__force u16)keys->ports.src))) {
1531 swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
1532 swap(keys->ports.src, keys->ports.dst);
1533 }
1534 break;
1535 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1536 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1537 &keys->addrs.v6addrs.src,
1538 sizeof(keys->addrs.v6addrs.dst));
1539 if ((addr_diff < 0) ||
1540 (addr_diff == 0 &&
1541 ((__force u16)keys->ports.dst <
1542 (__force u16)keys->ports.src))) {
1543 for (i = 0; i < 4; i++)
1544 swap(keys->addrs.v6addrs.src.s6_addr32[i],
1545 keys->addrs.v6addrs.dst.s6_addr32[i]);
1546 swap(keys->ports.src, keys->ports.dst);
1547 }
1548 break;
1549 }
66415cf8
HFS		 1550}
1551
55667441
ED		 1552static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1553 const siphash_key_t *keyval)
5ed20a68
TH		 1554{
1555 u32 hash;
1556
c3f83241 1557 __flow_hash_consistentify(keys);
5ed20a68 1558
55667441
ED		 1559 hash = siphash(flow_keys_hash_start(keys),
1560 flow_keys_hash_length(keys), keyval);
5ed20a68
TH		 1561 if (!hash)
1562 hash = 1;
1563
1564 return hash;
1565}
1566
1567u32 flow_hash_from_keys(struct flow_keys *keys)
1568{
50fb7992 1569 __flow_hash_secret_init();
55667441 1570 return __flow_hash_from_keys(keys, &hashrnd);
5ed20a68
TH		 1571}
1572EXPORT_SYMBOL(flow_hash_from_keys);
1573
50fb7992 1574static inline u32 ___skb_get_hash(const struct sk_buff *skb,
55667441
ED		 1575 struct flow_keys *keys,
1576 const siphash_key_t *keyval)
50fb7992 1577{
6db61d79
TH		 1578 skb_flow_dissect_flow_keys(skb, keys,
1579 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
50fb7992
TH		 1580
1581 return __flow_hash_from_keys(keys, keyval);
1582}
1583
2f59e1eb
TH		 1584struct _flow_keys_digest_data {
1585 __be16 n_proto;
1586 u8 ip_proto;
1587 u8 padding;
1588 __be32 ports;
1589 __be32 src;
1590 __be32 dst;
1591};
1592
1593void make_flow_keys_digest(struct flow_keys_digest *digest,
1594 const struct flow_keys *flow)
1595{
1596 struct _flow_keys_digest_data *data =
1597 (struct _flow_keys_digest_data *)digest;
1598
1599 BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1600
1601 memset(digest, 0, sizeof(*digest));
1602
06635a35
JP		 1603 data->n_proto = flow->basic.n_proto;
1604 data->ip_proto = flow->basic.ip_proto;
1605 data->ports = flow->ports.ports;
c3f83241
TH		 1606 data->src = flow->addrs.v4addrs.src;
1607 data->dst = flow->addrs.v4addrs.dst;
2f59e1eb
TH		 1608}
1609EXPORT_SYMBOL(make_flow_keys_digest);
1610
eb70db87
DM		 1611static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1612
b917783c 1613u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
eb70db87
DM		 1614{
1615 struct flow_keys keys;
1616
1617 __flow_hash_secret_init();
1618
1619 memset(&keys, 0, sizeof(keys));
3cbf4ffb
SF		 1620 __skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1621 &keys, NULL, 0, 0, 0,
eb70db87
DM		 1622 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1623
55667441 1624 return __flow_hash_from_keys(&keys, &hashrnd);
eb70db87
DM		 1625}
1626EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1627
d4fd3275
JP		 1628/**
1629 * __skb_get_hash: calculate a flow hash
1630 * @skb: sk_buff to calculate flow hash from
1631 *
1632 * This function calculates a flow hash based on src/dst addresses
61b905da
TH		 1633 * and src/dst port numbers. Sets hash in skb to non-zero hash value
1634 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
441d9d32
CW		 1635 * if hash is a canonical 4-tuple hash over transport ports.
1636 */
3958afa1 1637void __skb_get_hash(struct sk_buff *skb)
441d9d32
CW		 1638{
1639 struct flow_keys keys;
635c223c 1640 u32 hash;
441d9d32 1641
50fb7992
TH		 1642 __flow_hash_secret_init();
1643
55667441 1644 hash = ___skb_get_hash(skb, &keys, &hashrnd);
635c223c
GF		 1645
1646 __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
441d9d32 1647}
3958afa1 1648EXPORT_SYMBOL(__skb_get_hash);
441d9d32 1649
55667441
ED		 1650__u32 skb_get_hash_perturb(const struct sk_buff *skb,
1651 const siphash_key_t *perturb)
50fb7992
TH		 1652{
1653 struct flow_keys keys;
1654
1655 return ___skb_get_hash(skb, &keys, perturb);
1656}
1657EXPORT_SYMBOL(skb_get_hash_perturb);
1658
56193d1b 1659u32 __skb_get_poff(const struct sk_buff *skb, void *data,
72a338bc 1660 const struct flow_keys_basic *keys, int hlen)
f77668dc 1661{
42aecaa9 1662 u32 poff = keys->control.thoff;
f77668dc 1663
43d2ccb3
AD		 1664 /* skip L4 headers for fragments after the first */
1665 if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1666 !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1667 return poff;
1668
06635a35 1669 switch (keys->basic.ip_proto) {
f77668dc 1670 case IPPROTO_TCP: {
5af7fb6e
AD		 1671 /* access doff as u8 to avoid unaligned access */
1672 const u8 *doff;
1673 u8 _doff;
f77668dc 1674
5af7fb6e
AD		 1675 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1676 data, hlen, &_doff);
1677 if (!doff)
f77668dc
DB		 1678 return poff;
1679
5af7fb6e 1680 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
f77668dc
DB		 1681 break;
1682 }
1683 case IPPROTO_UDP:
1684 case IPPROTO_UDPLITE:
1685 poff += sizeof(struct udphdr);
1686 break;
1687 /* For the rest, we do not really care about header
1688 * extensions at this point for now.
1689 */
1690 case IPPROTO_ICMP:
1691 poff += sizeof(struct icmphdr);
1692 break;
1693 case IPPROTO_ICMPV6:
1694 poff += sizeof(struct icmp6hdr);
1695 break;
1696 case IPPROTO_IGMP:
1697 poff += sizeof(struct igmphdr);
1698 break;
1699 case IPPROTO_DCCP:
1700 poff += sizeof(struct dccp_hdr);
1701 break;
1702 case IPPROTO_SCTP:
1703 poff += sizeof(struct sctphdr);
1704 break;
1705 }
1706
1707 return poff;
1708}
1709
0db89b8b
JP		 1710/**
1711 * skb_get_poff - get the offset to the payload
1712 * @skb: sk_buff to get the payload offset from
1713 *
1714 * The function will get the offset to the payload as far as it could
1715 * be dissected. The main user is currently BPF, so that we can dynamically
56193d1b
AD		 1716 * truncate packets without needing to push actual payload to the user
1717 * space and can analyze headers only, instead.
1718 */
1719u32 skb_get_poff(const struct sk_buff *skb)
1720{
72a338bc 1721 struct flow_keys_basic keys;
56193d1b 1722
3cbf4ffb
SF		 1723 if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1724 NULL, 0, 0, 0, 0))
56193d1b
AD		 1725 return 0;
1726
1727 return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1728}
06635a35 1729
20a17bf6 1730__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
a17ace95
DM		 1731{
1732 memset(keys, 0, sizeof(*keys));
1733
1734 memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1735 sizeof(keys->addrs.v6addrs.src));
1736 memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1737 sizeof(keys->addrs.v6addrs.dst));
1738 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1739 keys->ports.src = fl6->fl6_sport;
1740 keys->ports.dst = fl6->fl6_dport;
1741 keys->keyid.keyid = fl6->fl6_gre_key;
fa1be7e0 1742 keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
a17ace95
DM		 1743 keys->basic.ip_proto = fl6->flowi6_proto;
1744
1745 return flow_hash_from_keys(keys);
1746}
1747EXPORT_SYMBOL(__get_hash_from_flowi6);
1748
06635a35 1749static const struct flow_dissector_key flow_keys_dissector_keys[] = {
42aecaa9
TH		 1750 {
1751 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1752 .offset = offsetof(struct flow_keys, control),
1753 },
06635a35
JP		 1754 {
1755 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1756 .offset = offsetof(struct flow_keys, basic),
1757 },
1758 {
1759 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
c3f83241
TH		 1760 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1761 },
1762 {
1763 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1764 .offset = offsetof(struct flow_keys, addrs.v6addrs),
06635a35 1765 },
9f249089 1766 {
8d6e79d3
JM		 1767 .key_id = FLOW_DISSECTOR_KEY_TIPC,
1768 .offset = offsetof(struct flow_keys, addrs.tipckey),
9f249089 1769 },
06635a35
JP		 1770 {
1771 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1772 .offset = offsetof(struct flow_keys, ports),
1773 },
d34af823 1774 {
f6a66927
HHZ		 1775 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1776 .offset = offsetof(struct flow_keys, vlan),
d34af823 1777 },
87ee9e52
TH		 1778 {
1779 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1780 .offset = offsetof(struct flow_keys, tags),
1781 },
1fdd512c
TH		 1782 {
1783 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1784 .offset = offsetof(struct flow_keys, keyid),
1785 },
06635a35
JP		 1786};
1787
eb70db87
DM		 1788static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1789 {
1790 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1791 .offset = offsetof(struct flow_keys, control),
1792 },
1793 {
1794 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1795 .offset = offsetof(struct flow_keys, basic),
1796 },
1797 {
1798 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1799 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1800 },
1801 {
1802 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1803 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1804 },
1805 {
1806 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1807 .offset = offsetof(struct flow_keys, ports),
1808 },
1809};
1810
72a338bc 1811static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
42aecaa9
TH		 1812 {
1813 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1814 .offset = offsetof(struct flow_keys, control),
1815 },
06635a35
JP		 1816 {
1817 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1818 .offset = offsetof(struct flow_keys, basic),
1819 },
1820};
1821
1822struct flow_dissector flow_keys_dissector __read_mostly;
1823EXPORT_SYMBOL(flow_keys_dissector);
1824
72a338bc
PA		 1825struct flow_dissector flow_keys_basic_dissector __read_mostly;
1826EXPORT_SYMBOL(flow_keys_basic_dissector);
06635a35
JP		 1827
1828static int __init init_default_flow_dissectors(void)
1829{
1830 skb_flow_dissector_init(&flow_keys_dissector,
1831 flow_keys_dissector_keys,
1832 ARRAY_SIZE(flow_keys_dissector_keys));
eb70db87
DM		 1833 skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1834 flow_keys_dissector_symmetric_keys,
1835 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
72a338bc
PA		 1836 skb_flow_dissector_init(&flow_keys_basic_dissector,
1837 flow_keys_basic_dissector_keys,
1838 ARRAY_SIZE(flow_keys_basic_dissector_keys));
06635a35
JP		 1839 return 0;
1840}
1841
c9b8af13 1842core_initcall(init_default_flow_dissectors);
Linux 6.x block layer and io_uring tree(s)