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Thomas Gleixner457c8992019-05-19 13:08:55 +01001// SPDX-License-Identifier: GPL-2.0-only
Jiri Pirkofbff9492015-05-12 14:56:15 +02002#include <linux/kernel.h>
Eric Dumazet0744dd02011-11-28 05:22:18 +00003#include <linux/skbuff.h>
Jesper Dangaard Brouerc452ed72012-01-24 16:03:33 -05004#include <linux/export.h>
Eric Dumazet0744dd02011-11-28 05:22:18 +00005#include <linux/ip.h>
6#include <linux/ipv6.h>
7#include <linux/if_vlan.h>
Jakub Kicinskib6459412021-12-28 16:49:13 -08008#include <linux/filter.h>
John Crispin43e66522017-08-09 14:41:19 +02009#include <net/dsa.h>
Simon Hormana38402b2017-10-02 10:41:16 +020010#include <net/dst_metadata.h>
Eric Dumazet0744dd02011-11-28 05:22:18 +000011#include <net/ip.h>
Eric Dumazetddbe5032012-07-18 08:11:12 +000012#include <net/ipv6.h>
Gao Fengab10dcc2016-08-09 12:38:24 +080013#include <net/gre.h>
14#include <net/pptp.h>
Jon Maloy8d6e79d2017-11-08 09:59:26 +010015#include <net/tipc.h>
Daniel Borkmannf77668d2013-03-19 06:39:30 +000016#include <linux/igmp.h>
17#include <linux/icmp.h>
18#include <linux/sctp.h>
19#include <linux/dccp.h>
Eric Dumazet0744dd02011-11-28 05:22:18 +000020#include <linux/if_tunnel.h>
21#include <linux/if_pppox.h>
22#include <linux/ppp_defs.h>
Jiri Pirko06635a32015-05-12 14:56:16 +020023#include <linux/stddef.h>
Jiri Pirko67a900c2015-05-12 14:56:19 +020024#include <linux/if_ether.h>
Kurt Kanzenbachbf088242022-02-28 20:58:56 +010025#include <linux/if_hsr.h>
Tom Herbertb3baa0f2015-06-04 09:16:46 -070026#include <linux/mpls.h>
Jiri Pirkoac4bb5d2017-05-23 18:40:44 +020027#include <linux/tcp.h>
Eran Ben Elisha4f1cc512021-01-12 21:07:13 +020028#include <linux/ptp_classify.h>
Jiri Pirko1bd758e2015-05-12 14:56:07 +020029#include <net/flow_dissector.h>
Alexander Duyck56193d12014-09-05 19:20:26 -040030#include <scsi/fc/fc_fcoe.h>
Sven Eckelmann5b0890a2017-12-21 10:17:42 +010031#include <uapi/linux/batadv_packet.h>
Petar Penkovd58e4682018-09-14 07:46:18 -070032#include <linux/bpf.h>
Paul Blakey75a56752019-07-09 10:30:49 +030033#if IS_ENABLED(CONFIG_NF_CONNTRACK)
34#include <net/netfilter/nf_conntrack_core.h>
35#include <net/netfilter/nf_conntrack_labels.h>
36#endif
Jakub Sitnickia3fd7ce2020-05-31 10:28:36 +020037#include <linux/bpf-netns.h>
Petar Penkovd58e4682018-09-14 07:46:18 -070038
David S. Miller20a17bf2015-09-01 21:19:17 -070039static void dissector_set_key(struct flow_dissector *flow_dissector,
40 enum flow_dissector_key_id key_id)
Jiri Pirkofbff9492015-05-12 14:56:15 +020041{
42 flow_dissector->used_keys |= (1 << key_id);
43}
44
Jiri Pirkofbff9492015-05-12 14:56:15 +020045void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
46 const struct flow_dissector_key *key,
47 unsigned int key_count)
48{
49 unsigned int i;
50
51 memset(flow_dissector, 0, sizeof(*flow_dissector));
52
53 for (i = 0; i < key_count; i++, key++) {
Wang Qing75a5fb02020-11-06 16:11:49 +080054 /* User should make sure that every key target offset is within
Jiri Pirkofbff9492015-05-12 14:56:15 +020055 * boundaries of unsigned short.
56 */
57 BUG_ON(key->offset > USHRT_MAX);
David S. Miller20a17bf2015-09-01 21:19:17 -070058 BUG_ON(dissector_uses_key(flow_dissector,
59 key->key_id));
Jiri Pirkofbff9492015-05-12 14:56:15 +020060
David S. Miller20a17bf2015-09-01 21:19:17 -070061 dissector_set_key(flow_dissector, key->key_id);
Jiri Pirkofbff9492015-05-12 14:56:15 +020062 flow_dissector->offset[key->key_id] = key->offset;
63 }
64
Tom Herbert42aecaa2015-06-04 09:16:39 -070065 /* Ensure that the dissector always includes control and basic key.
66 * That way we are able to avoid handling lack of these in fast path.
Jiri Pirkofbff9492015-05-12 14:56:15 +020067 */
David S. Miller20a17bf2015-09-01 21:19:17 -070068 BUG_ON(!dissector_uses_key(flow_dissector,
69 FLOW_DISSECTOR_KEY_CONTROL));
70 BUG_ON(!dissector_uses_key(flow_dissector,
71 FLOW_DISSECTOR_KEY_BASIC));
Jiri Pirkofbff9492015-05-12 14:56:15 +020072}
73EXPORT_SYMBOL(skb_flow_dissector_init);
74
Jakub Sitnickib27f7bb2020-05-31 10:28:37 +020075#ifdef CONFIG_BPF_SYSCALL
Jakub Sitnicki3b701692020-06-25 16:13:54 +020076int flow_dissector_bpf_prog_attach_check(struct net *net,
77 struct bpf_prog *prog)
Petar Penkovd58e4682018-09-14 07:46:18 -070078{
Jakub Sitnickia3fd7ce2020-05-31 10:28:36 +020079 enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
Stanislav Fomicheva11c3972019-10-07 09:21:02 -070080
81 if (net == &init_net) {
82 /* BPF flow dissector in the root namespace overrides
83 * any per-net-namespace one. When attaching to root,
84 * make sure we don't have any BPF program attached
85 * to the non-root namespaces.
86 */
87 struct net *ns;
88
89 for_each_net(ns) {
Jakub Sitnicki719b78a52019-10-11 10:29:45 +020090 if (ns == &init_net)
91 continue;
Jakub Sitnicki695c1212020-06-25 16:13:55 +020092 if (rcu_access_pointer(ns->bpf.run_array[type]))
Jakub Sitnicki171526f2020-05-31 10:28:35 +020093 return -EEXIST;
Stanislav Fomicheva11c3972019-10-07 09:21:02 -070094 }
95 } else {
96 /* Make sure root flow dissector is not attached
97 * when attaching to the non-root namespace.
98 */
Jakub Sitnicki695c1212020-06-25 16:13:55 +020099 if (rcu_access_pointer(init_net.bpf.run_array[type]))
Jakub Sitnicki171526f2020-05-31 10:28:35 +0200100 return -EEXIST;
Stanislav Fomicheva11c3972019-10-07 09:21:02 -0700101 }
102
Jakub Sitnicki171526f2020-05-31 10:28:35 +0200103 return 0;
104}
Jakub Sitnickib27f7bb2020-05-31 10:28:37 +0200105#endif /* CONFIG_BPF_SYSCALL */
Jakub Sitnicki5cf65922020-05-21 10:34:35 +0200106
Simon Horman972d3872016-12-07 13:48:27 +0100107/**
WANG Cong6451b3f2014-08-25 17:03:46 -0700108 * __skb_flow_get_ports - extract the upper layer ports and return them
109 * @skb: sk_buff to extract the ports from
Nikolay Aleksandrov357afe92013-10-02 13:39:24 +0200110 * @thoff: transport header offset
111 * @ip_proto: protocol for which to get port offset
WANG Cong6451b3f2014-08-25 17:03:46 -0700112 * @data: raw buffer pointer to the packet, if NULL use skb->data
113 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
Nikolay Aleksandrov357afe92013-10-02 13:39:24 +0200114 *
115 * The function will try to retrieve the ports at offset thoff + poff where poff
116 * is the protocol port offset returned from proto_ports_offset
117 */
David S. Miller690e36e2014-08-23 12:13:41 -0700118__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000119 const void *data, int hlen)
Nikolay Aleksandrov357afe92013-10-02 13:39:24 +0200120{
121 int poff = proto_ports_offset(ip_proto);
122
David S. Miller690e36e2014-08-23 12:13:41 -0700123 if (!data) {
124 data = skb->data;
125 hlen = skb_headlen(skb);
126 }
127
Nikolay Aleksandrov357afe92013-10-02 13:39:24 +0200128 if (poff >= 0) {
129 __be32 *ports, _ports;
130
David S. Miller690e36e2014-08-23 12:13:41 -0700131 ports = __skb_header_pointer(skb, thoff + poff,
132 sizeof(_ports), data, hlen, &_ports);
Nikolay Aleksandrov357afe92013-10-02 13:39:24 +0200133 if (ports)
134 return *ports;
135 }
136
137 return 0;
138}
David S. Miller690e36e2014-08-23 12:13:41 -0700139EXPORT_SYMBOL(__skb_flow_get_ports);
Nikolay Aleksandrov357afe92013-10-02 13:39:24 +0200140
Matteo Croce5dec5972019-10-29 14:50:52 +0100141static bool icmp_has_id(u8 type)
142{
143 switch (type) {
144 case ICMP_ECHO:
145 case ICMP_ECHOREPLY:
146 case ICMP_TIMESTAMP:
147 case ICMP_TIMESTAMPREPLY:
148 case ICMPV6_ECHO_REQUEST:
149 case ICMPV6_ECHO_REPLY:
150 return true;
151 }
152
153 return false;
154}
155
156/**
157 * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields
158 * @skb: sk_buff to extract from
159 * @key_icmp: struct flow_dissector_key_icmp to fill
160 * @data: raw buffer pointer to the packet
Li RongQing6b3acfc2020-01-09 08:59:56 +0800161 * @thoff: offset to extract at
Matteo Croce5dec5972019-10-29 14:50:52 +0100162 * @hlen: packet header length
163 */
164void skb_flow_get_icmp_tci(const struct sk_buff *skb,
165 struct flow_dissector_key_icmp *key_icmp,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000166 const void *data, int thoff, int hlen)
Matteo Croce5dec5972019-10-29 14:50:52 +0100167{
168 struct icmphdr *ih, _ih;
169
170 ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih);
171 if (!ih)
172 return;
173
174 key_icmp->type = ih->type;
175 key_icmp->code = ih->code;
176
177 /* As we use 0 to signal that the Id field is not present,
178 * avoid confusion with packets without such field
179 */
180 if (icmp_has_id(ih->type))
Alexander Lobakina25f8222021-03-12 20:08:57 +0000181 key_icmp->id = ih->un.echo.id ? ntohs(ih->un.echo.id) : 1;
Matteo Croce5dec5972019-10-29 14:50:52 +0100182 else
183 key_icmp->id = 0;
184}
185EXPORT_SYMBOL(skb_flow_get_icmp_tci);
186
187/* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet
188 * using skb_flow_get_icmp_tci().
Matteo Croce3b336d6f2019-10-29 14:50:51 +0100189 */
190static void __skb_flow_dissect_icmp(const struct sk_buff *skb,
191 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000192 void *target_container, const void *data,
193 int thoff, int hlen)
Matteo Croce3b336d6f2019-10-29 14:50:51 +0100194{
195 struct flow_dissector_key_icmp *key_icmp;
196
197 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP))
198 return;
199
200 key_icmp = skb_flow_dissector_target(flow_dissector,
201 FLOW_DISSECTOR_KEY_ICMP,
202 target_container);
Matteo Croce5dec5972019-10-29 14:50:52 +0100203
204 skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen);
Matteo Croce3b336d6f2019-10-29 14:50:51 +0100205}
206
Wojciech Drewekdda2fa02022-09-08 10:16:41 -0700207static void __skb_flow_dissect_l2tpv3(const struct sk_buff *skb,
208 struct flow_dissector *flow_dissector,
209 void *target_container, const void *data,
210 int nhoff, int hlen)
211{
212 struct flow_dissector_key_l2tpv3 *key_l2tpv3;
213 struct {
214 __be32 session_id;
215 } *hdr, _hdr;
216
217 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_L2TPV3))
218 return;
219
220 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
221 if (!hdr)
222 return;
223
224 key_l2tpv3 = skb_flow_dissector_target(flow_dissector,
225 FLOW_DISSECTOR_KEY_L2TPV3,
226 target_container);
227
228 key_l2tpv3->session_id = hdr->session_id;
229}
230
Jiri Pirko82828b82019-06-19 09:41:02 +0300231void skb_flow_dissect_meta(const struct sk_buff *skb,
232 struct flow_dissector *flow_dissector,
233 void *target_container)
234{
235 struct flow_dissector_key_meta *meta;
236
237 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
238 return;
239
240 meta = skb_flow_dissector_target(flow_dissector,
241 FLOW_DISSECTOR_KEY_META,
242 target_container);
243 meta->ingress_ifindex = skb->skb_iif;
244}
245EXPORT_SYMBOL(skb_flow_dissect_meta);
246
Simon Hormana38402b2017-10-02 10:41:16 +0200247static void
248skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
249 struct flow_dissector *flow_dissector,
250 void *target_container)
251{
252 struct flow_dissector_key_control *ctrl;
253
254 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
255 return;
256
257 ctrl = skb_flow_dissector_target(flow_dissector,
258 FLOW_DISSECTOR_KEY_ENC_CONTROL,
259 target_container);
260 ctrl->addr_type = type;
261}
262
Simon Horman62b32372017-12-04 11:31:48 +0100263void
Paul Blakey75a56752019-07-09 10:30:49 +0300264skb_flow_dissect_ct(const struct sk_buff *skb,
265 struct flow_dissector *flow_dissector,
wenxu7baf2422021-01-19 16:31:50 +0800266 void *target_container, u16 *ctinfo_map,
Paul Blakey38495952021-12-14 19:24:34 +0200267 size_t mapsize, bool post_ct, u16 zone)
Paul Blakey75a56752019-07-09 10:30:49 +0300268{
269#if IS_ENABLED(CONFIG_NF_CONNTRACK)
270 struct flow_dissector_key_ct *key;
271 enum ip_conntrack_info ctinfo;
272 struct nf_conn_labels *cl;
273 struct nf_conn *ct;
274
275 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
276 return;
277
278 ct = nf_ct_get(skb, &ctinfo);
wenxu7baf2422021-01-19 16:31:50 +0800279 if (!ct && !post_ct)
Paul Blakey75a56752019-07-09 10:30:49 +0300280 return;
281
282 key = skb_flow_dissector_target(flow_dissector,
283 FLOW_DISSECTOR_KEY_CT,
284 target_container);
285
wenxu7baf2422021-01-19 16:31:50 +0800286 if (!ct) {
287 key->ct_state = TCA_FLOWER_KEY_CT_FLAGS_TRACKED |
288 TCA_FLOWER_KEY_CT_FLAGS_INVALID;
Paul Blakey38495952021-12-14 19:24:34 +0200289 key->ct_zone = zone;
wenxu7baf2422021-01-19 16:31:50 +0800290 return;
291 }
292
Paul Blakey75a56752019-07-09 10:30:49 +0300293 if (ctinfo < mapsize)
294 key->ct_state = ctinfo_map[ctinfo];
295#if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
296 key->ct_zone = ct->zone.id;
297#endif
298#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
Daniel Xu52d1aa82022-11-09 12:39:07 -0700299 key->ct_mark = READ_ONCE(ct->mark);
Paul Blakey75a56752019-07-09 10:30:49 +0300300#endif
301
302 cl = nf_ct_labels_find(ct);
303 if (cl)
304 memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
305#endif /* CONFIG_NF_CONNTRACK */
306}
307EXPORT_SYMBOL(skb_flow_dissect_ct);
308
309void
Simon Horman62b32372017-12-04 11:31:48 +0100310skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
311 struct flow_dissector *flow_dissector,
312 void *target_container)
Simon Hormana38402b2017-10-02 10:41:16 +0200313{
314 struct ip_tunnel_info *info;
315 struct ip_tunnel_key *key;
316
317 /* A quick check to see if there might be something to do. */
318 if (!dissector_uses_key(flow_dissector,
319 FLOW_DISSECTOR_KEY_ENC_KEYID) &&
320 !dissector_uses_key(flow_dissector,
321 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
322 !dissector_uses_key(flow_dissector,
323 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
324 !dissector_uses_key(flow_dissector,
325 FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
326 !dissector_uses_key(flow_dissector,
Or Gerlitz5544adb2018-07-17 19:27:17 +0300327 FLOW_DISSECTOR_KEY_ENC_PORTS) &&
328 !dissector_uses_key(flow_dissector,
Simon Horman92e2c402018-08-07 17:36:00 +0200329 FLOW_DISSECTOR_KEY_ENC_IP) &&
330 !dissector_uses_key(flow_dissector,
331 FLOW_DISSECTOR_KEY_ENC_OPTS))
Simon Hormana38402b2017-10-02 10:41:16 +0200332 return;
333
334 info = skb_tunnel_info(skb);
335 if (!info)
336 return;
337
338 key = &info->key;
339
340 switch (ip_tunnel_info_af(info)) {
341 case AF_INET:
342 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
343 flow_dissector,
344 target_container);
345 if (dissector_uses_key(flow_dissector,
346 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
347 struct flow_dissector_key_ipv4_addrs *ipv4;
348
349 ipv4 = skb_flow_dissector_target(flow_dissector,
350 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
351 target_container);
352 ipv4->src = key->u.ipv4.src;
353 ipv4->dst = key->u.ipv4.dst;
354 }
355 break;
356 case AF_INET6:
357 skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
358 flow_dissector,
359 target_container);
360 if (dissector_uses_key(flow_dissector,
361 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
362 struct flow_dissector_key_ipv6_addrs *ipv6;
363
364 ipv6 = skb_flow_dissector_target(flow_dissector,
365 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
366 target_container);
367 ipv6->src = key->u.ipv6.src;
368 ipv6->dst = key->u.ipv6.dst;
369 }
370 break;
371 }
372
373 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
374 struct flow_dissector_key_keyid *keyid;
375
376 keyid = skb_flow_dissector_target(flow_dissector,
377 FLOW_DISSECTOR_KEY_ENC_KEYID,
378 target_container);
379 keyid->keyid = tunnel_id_to_key32(key->tun_id);
380 }
381
382 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
383 struct flow_dissector_key_ports *tp;
384
385 tp = skb_flow_dissector_target(flow_dissector,
386 FLOW_DISSECTOR_KEY_ENC_PORTS,
387 target_container);
388 tp->src = key->tp_src;
389 tp->dst = key->tp_dst;
390 }
Or Gerlitz5544adb2018-07-17 19:27:17 +0300391
392 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
393 struct flow_dissector_key_ip *ip;
394
395 ip = skb_flow_dissector_target(flow_dissector,
396 FLOW_DISSECTOR_KEY_ENC_IP,
397 target_container);
398 ip->tos = key->tos;
399 ip->ttl = key->ttl;
400 }
Simon Horman92e2c402018-08-07 17:36:00 +0200401
402 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
403 struct flow_dissector_key_enc_opts *enc_opt;
404
405 enc_opt = skb_flow_dissector_target(flow_dissector,
406 FLOW_DISSECTOR_KEY_ENC_OPTS,
407 target_container);
408
409 if (info->options_len) {
410 enc_opt->len = info->options_len;
411 ip_tunnel_info_opts_get(enc_opt->data, info);
412 enc_opt->dst_opt_type = info->key.tun_flags &
413 TUNNEL_OPTIONS_PRESENT;
414 }
415 }
Simon Hormana38402b2017-10-02 10:41:16 +0200416}
Simon Horman62b32372017-12-04 11:31:48 +0100417EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
Simon Hormana38402b2017-10-02 10:41:16 +0200418
Ariel Levkovich0cb09af2020-07-23 01:03:00 +0300419void skb_flow_dissect_hash(const struct sk_buff *skb,
420 struct flow_dissector *flow_dissector,
421 void *target_container)
422{
423 struct flow_dissector_key_hash *key;
424
425 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_HASH))
426 return;
427
428 key = skb_flow_dissector_target(flow_dissector,
429 FLOW_DISSECTOR_KEY_HASH,
430 target_container);
431
432 key->hash = skb_get_hash_raw(skb);
433}
434EXPORT_SYMBOL(skb_flow_dissect_hash);
435
Jiri Pirko9bf881f2017-03-06 16:39:51 +0100436static enum flow_dissect_ret
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +0100437__skb_flow_dissect_mpls(const struct sk_buff *skb,
438 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000439 void *target_container, const void *data, int nhoff,
440 int hlen, int lse_index, bool *entropy_label)
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +0100441{
Guillaume Nault58cff782020-05-26 14:29:00 +0200442 struct mpls_label *hdr, _hdr;
443 u32 entry, label, bos;
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +0100444
445 if (!dissector_uses_key(flow_dissector,
Benjamin LaHaise029c1ec2017-04-22 16:52:46 -0400446 FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
447 !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +0100448 return FLOW_DISSECT_RET_OUT_GOOD;
449
Guillaume Nault58cff782020-05-26 14:29:00 +0200450 if (lse_index >= FLOW_DIS_MPLS_MAX)
451 return FLOW_DISSECT_RET_OUT_GOOD;
452
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +0100453 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
454 hlen, &_hdr);
455 if (!hdr)
456 return FLOW_DISSECT_RET_OUT_BAD;
457
Guillaume Nault58cff782020-05-26 14:29:00 +0200458 entry = ntohl(hdr->entry);
Benjamin LaHaise029c1ec2017-04-22 16:52:46 -0400459 label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
Guillaume Nault58cff782020-05-26 14:29:00 +0200460 bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
Benjamin LaHaise029c1ec2017-04-22 16:52:46 -0400461
462 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
463 struct flow_dissector_key_mpls *key_mpls;
Guillaume Nault58cff782020-05-26 14:29:00 +0200464 struct flow_dissector_mpls_lse *lse;
Benjamin LaHaise029c1ec2017-04-22 16:52:46 -0400465
466 key_mpls = skb_flow_dissector_target(flow_dissector,
467 FLOW_DISSECTOR_KEY_MPLS,
468 target_container);
Guillaume Nault58cff782020-05-26 14:29:00 +0200469 lse = &key_mpls->ls[lse_index];
470
471 lse->mpls_ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
472 lse->mpls_bos = bos;
473 lse->mpls_tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
474 lse->mpls_label = label;
475 dissector_set_mpls_lse(key_mpls, lse_index);
Benjamin LaHaise029c1ec2017-04-22 16:52:46 -0400476 }
477
Guillaume Nault58cff782020-05-26 14:29:00 +0200478 if (*entropy_label &&
479 dissector_uses_key(flow_dissector,
480 FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
481 struct flow_dissector_key_keyid *key_keyid;
482
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +0100483 key_keyid = skb_flow_dissector_target(flow_dissector,
484 FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
485 target_container);
Guillaume Nault58cff782020-05-26 14:29:00 +0200486 key_keyid->keyid = cpu_to_be32(label);
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +0100487 }
Guillaume Nault58cff782020-05-26 14:29:00 +0200488
489 *entropy_label = label == MPLS_LABEL_ENTROPY;
490
491 return bos ? FLOW_DISSECT_RET_OUT_GOOD : FLOW_DISSECT_RET_PROTO_AGAIN;
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +0100492}
493
494static enum flow_dissect_ret
Jiri Pirko9bf881f2017-03-06 16:39:51 +0100495__skb_flow_dissect_arp(const struct sk_buff *skb,
496 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000497 void *target_container, const void *data,
498 int nhoff, int hlen)
Jiri Pirko9bf881f2017-03-06 16:39:51 +0100499{
500 struct flow_dissector_key_arp *key_arp;
501 struct {
502 unsigned char ar_sha[ETH_ALEN];
503 unsigned char ar_sip[4];
504 unsigned char ar_tha[ETH_ALEN];
505 unsigned char ar_tip[4];
506 } *arp_eth, _arp_eth;
507 const struct arphdr *arp;
David S. Miller6f14f442017-04-06 07:25:07 -0700508 struct arphdr _arp;
Jiri Pirko9bf881f2017-03-06 16:39:51 +0100509
510 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
511 return FLOW_DISSECT_RET_OUT_GOOD;
512
513 arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
514 hlen, &_arp);
515 if (!arp)
516 return FLOW_DISSECT_RET_OUT_BAD;
517
518 if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
519 arp->ar_pro != htons(ETH_P_IP) ||
520 arp->ar_hln != ETH_ALEN ||
521 arp->ar_pln != 4 ||
522 (arp->ar_op != htons(ARPOP_REPLY) &&
523 arp->ar_op != htons(ARPOP_REQUEST)))
524 return FLOW_DISSECT_RET_OUT_BAD;
525
526 arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
527 sizeof(_arp_eth), data,
528 hlen, &_arp_eth);
529 if (!arp_eth)
530 return FLOW_DISSECT_RET_OUT_BAD;
531
532 key_arp = skb_flow_dissector_target(flow_dissector,
533 FLOW_DISSECTOR_KEY_ARP,
534 target_container);
535
536 memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
537 memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
538
539 /* Only store the lower byte of the opcode;
540 * this covers ARPOP_REPLY and ARPOP_REQUEST.
541 */
542 key_arp->op = ntohs(arp->ar_op) & 0xff;
543
544 ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
545 ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
546
547 return FLOW_DISSECT_RET_OUT_GOOD;
548}
549
Jiri Pirko7c92de82017-03-06 16:39:55 +0100550static enum flow_dissect_ret
551__skb_flow_dissect_gre(const struct sk_buff *skb,
552 struct flow_dissector_key_control *key_control,
553 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000554 void *target_container, const void *data,
Jiri Pirko7c92de82017-03-06 16:39:55 +0100555 __be16 *p_proto, int *p_nhoff, int *p_hlen,
556 unsigned int flags)
557{
558 struct flow_dissector_key_keyid *key_keyid;
559 struct gre_base_hdr *hdr, _hdr;
560 int offset = 0;
561 u16 gre_ver;
562
563 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
564 data, *p_hlen, &_hdr);
565 if (!hdr)
566 return FLOW_DISSECT_RET_OUT_BAD;
567
568 /* Only look inside GRE without routing */
569 if (hdr->flags & GRE_ROUTING)
570 return FLOW_DISSECT_RET_OUT_GOOD;
571
572 /* Only look inside GRE for version 0 and 1 */
573 gre_ver = ntohs(hdr->flags & GRE_VERSION);
574 if (gre_ver > 1)
575 return FLOW_DISSECT_RET_OUT_GOOD;
576
577 *p_proto = hdr->protocol;
578 if (gre_ver) {
579 /* Version1 must be PPTP, and check the flags */
580 if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
581 return FLOW_DISSECT_RET_OUT_GOOD;
582 }
583
584 offset += sizeof(struct gre_base_hdr);
585
586 if (hdr->flags & GRE_CSUM)
Pankaj Bharadiyac5936422019-12-09 10:31:43 -0800587 offset += sizeof_field(struct gre_full_hdr, csum) +
588 sizeof_field(struct gre_full_hdr, reserved1);
Jiri Pirko7c92de82017-03-06 16:39:55 +0100589
590 if (hdr->flags & GRE_KEY) {
591 const __be32 *keyid;
592 __be32 _keyid;
593
594 keyid = __skb_header_pointer(skb, *p_nhoff + offset,
595 sizeof(_keyid),
596 data, *p_hlen, &_keyid);
597 if (!keyid)
598 return FLOW_DISSECT_RET_OUT_BAD;
599
600 if (dissector_uses_key(flow_dissector,
601 FLOW_DISSECTOR_KEY_GRE_KEYID)) {
602 key_keyid = skb_flow_dissector_target(flow_dissector,
603 FLOW_DISSECTOR_KEY_GRE_KEYID,
604 target_container);
605 if (gre_ver == 0)
606 key_keyid->keyid = *keyid;
607 else
608 key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
609 }
Pankaj Bharadiyac5936422019-12-09 10:31:43 -0800610 offset += sizeof_field(struct gre_full_hdr, key);
Jiri Pirko7c92de82017-03-06 16:39:55 +0100611 }
612
613 if (hdr->flags & GRE_SEQ)
Pankaj Bharadiyac5936422019-12-09 10:31:43 -0800614 offset += sizeof_field(struct pptp_gre_header, seq);
Jiri Pirko7c92de82017-03-06 16:39:55 +0100615
616 if (gre_ver == 0) {
617 if (*p_proto == htons(ETH_P_TEB)) {
618 const struct ethhdr *eth;
619 struct ethhdr _eth;
620
621 eth = __skb_header_pointer(skb, *p_nhoff + offset,
622 sizeof(_eth),
623 data, *p_hlen, &_eth);
624 if (!eth)
625 return FLOW_DISSECT_RET_OUT_BAD;
626 *p_proto = eth->h_proto;
627 offset += sizeof(*eth);
628
629 /* Cap headers that we access via pointers at the
630 * end of the Ethernet header as our maximum alignment
631 * at that point is only 2 bytes.
632 */
633 if (NET_IP_ALIGN)
634 *p_hlen = *p_nhoff + offset;
635 }
636 } else { /* version 1, must be PPTP */
637 u8 _ppp_hdr[PPP_HDRLEN];
638 u8 *ppp_hdr;
639
640 if (hdr->flags & GRE_ACK)
Pankaj Bharadiyac5936422019-12-09 10:31:43 -0800641 offset += sizeof_field(struct pptp_gre_header, ack);
Jiri Pirko7c92de82017-03-06 16:39:55 +0100642
643 ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
644 sizeof(_ppp_hdr),
645 data, *p_hlen, _ppp_hdr);
646 if (!ppp_hdr)
647 return FLOW_DISSECT_RET_OUT_BAD;
648
649 switch (PPP_PROTOCOL(ppp_hdr)) {
650 case PPP_IP:
651 *p_proto = htons(ETH_P_IP);
652 break;
653 case PPP_IPV6:
654 *p_proto = htons(ETH_P_IPV6);
655 break;
656 default:
657 /* Could probably catch some more like MPLS */
658 break;
659 }
660
661 offset += PPP_HDRLEN;
662 }
663
664 *p_nhoff += offset;
665 key_control->flags |= FLOW_DIS_ENCAPSULATION;
666 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
667 return FLOW_DISSECT_RET_OUT_GOOD;
668
Tom Herbert3a1214e2017-09-01 14:04:11 -0700669 return FLOW_DISSECT_RET_PROTO_AGAIN;
Jiri Pirko7c92de82017-03-06 16:39:55 +0100670}
671
Sven Eckelmann5b0890a2017-12-21 10:17:42 +0100672/**
673 * __skb_flow_dissect_batadv() - dissect batman-adv header
674 * @skb: sk_buff to with the batman-adv header
675 * @key_control: flow dissectors control key
676 * @data: raw buffer pointer to the packet, if NULL use skb->data
677 * @p_proto: pointer used to update the protocol to process next
678 * @p_nhoff: pointer used to update inner network header offset
679 * @hlen: packet header length
680 * @flags: any combination of FLOW_DISSECTOR_F_*
681 *
682 * ETH_P_BATMAN packets are tried to be dissected. Only
683 * &struct batadv_unicast packets are actually processed because they contain an
684 * inner ethernet header and are usually followed by actual network header. This
685 * allows the flow dissector to continue processing the packet.
686 *
687 * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
688 * FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
689 * otherwise FLOW_DISSECT_RET_OUT_BAD
690 */
691static enum flow_dissect_ret
692__skb_flow_dissect_batadv(const struct sk_buff *skb,
693 struct flow_dissector_key_control *key_control,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000694 const void *data, __be16 *p_proto, int *p_nhoff,
695 int hlen, unsigned int flags)
Sven Eckelmann5b0890a2017-12-21 10:17:42 +0100696{
697 struct {
698 struct batadv_unicast_packet batadv_unicast;
699 struct ethhdr eth;
700 } *hdr, _hdr;
701
702 hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
703 &_hdr);
704 if (!hdr)
705 return FLOW_DISSECT_RET_OUT_BAD;
706
707 if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
708 return FLOW_DISSECT_RET_OUT_BAD;
709
710 if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
711 return FLOW_DISSECT_RET_OUT_BAD;
712
713 *p_proto = hdr->eth.h_proto;
714 *p_nhoff += sizeof(*hdr);
715
716 key_control->flags |= FLOW_DIS_ENCAPSULATION;
717 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
718 return FLOW_DISSECT_RET_OUT_GOOD;
719
720 return FLOW_DISSECT_RET_PROTO_AGAIN;
721}
722
Jiri Pirkoac4bb5d2017-05-23 18:40:44 +0200723static void
724__skb_flow_dissect_tcp(const struct sk_buff *skb,
725 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000726 void *target_container, const void *data,
727 int thoff, int hlen)
Jiri Pirkoac4bb5d2017-05-23 18:40:44 +0200728{
729 struct flow_dissector_key_tcp *key_tcp;
730 struct tcphdr *th, _th;
731
732 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
733 return;
734
735 th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
736 if (!th)
737 return;
738
739 if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
740 return;
741
742 key_tcp = skb_flow_dissector_target(flow_dissector,
743 FLOW_DISSECTOR_KEY_TCP,
744 target_container);
745 key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
746}
747
Or Gerlitz518d8a22017-06-01 21:37:37 +0300748static void
Yoshiki Komachi8ffb0552019-12-03 19:40:12 +0900749__skb_flow_dissect_ports(const struct sk_buff *skb,
750 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000751 void *target_container, const void *data,
752 int nhoff, u8 ip_proto, int hlen)
Yoshiki Komachi8ffb0552019-12-03 19:40:12 +0900753{
754 enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX;
755 struct flow_dissector_key_ports *key_ports;
756
757 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
758 dissector_ports = FLOW_DISSECTOR_KEY_PORTS;
759 else if (dissector_uses_key(flow_dissector,
760 FLOW_DISSECTOR_KEY_PORTS_RANGE))
761 dissector_ports = FLOW_DISSECTOR_KEY_PORTS_RANGE;
762
763 if (dissector_ports == FLOW_DISSECTOR_KEY_MAX)
764 return;
765
766 key_ports = skb_flow_dissector_target(flow_dissector,
767 dissector_ports,
768 target_container);
769 key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
770 data, hlen);
771}
772
773static void
Or Gerlitz518d8a22017-06-01 21:37:37 +0300774__skb_flow_dissect_ipv4(const struct sk_buff *skb,
775 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000776 void *target_container, const void *data,
777 const struct iphdr *iph)
Or Gerlitz518d8a22017-06-01 21:37:37 +0300778{
779 struct flow_dissector_key_ip *key_ip;
780
781 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
782 return;
783
784 key_ip = skb_flow_dissector_target(flow_dissector,
785 FLOW_DISSECTOR_KEY_IP,
786 target_container);
787 key_ip->tos = iph->tos;
788 key_ip->ttl = iph->ttl;
789}
790
791static void
792__skb_flow_dissect_ipv6(const struct sk_buff *skb,
793 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000794 void *target_container, const void *data,
795 const struct ipv6hdr *iph)
Or Gerlitz518d8a22017-06-01 21:37:37 +0300796{
797 struct flow_dissector_key_ip *key_ip;
798
799 if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
800 return;
801
802 key_ip = skb_flow_dissector_target(flow_dissector,
803 FLOW_DISSECTOR_KEY_IP,
804 target_container);
805 key_ip->tos = ipv6_get_dsfield(iph);
806 key_ip->ttl = iph->hop_limit;
807}
808
Tom Herbert1eed4df2017-09-01 14:04:12 -0700809/* Maximum number of protocol headers that can be parsed in
810 * __skb_flow_dissect
811 */
812#define MAX_FLOW_DISSECT_HDRS 15
813
814static bool skb_flow_dissect_allowed(int *num_hdrs)
815{
816 ++*num_hdrs;
817
818 return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
819}
820
Petar Penkovd58e4682018-09-14 07:46:18 -0700821static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
822 struct flow_dissector *flow_dissector,
823 void *target_container)
824{
Yoshiki Komachi59fb9b62020-01-17 16:05:32 +0900825 struct flow_dissector_key_ports *key_ports = NULL;
Petar Penkovd58e4682018-09-14 07:46:18 -0700826 struct flow_dissector_key_control *key_control;
827 struct flow_dissector_key_basic *key_basic;
828 struct flow_dissector_key_addrs *key_addrs;
Stanislav Fomichev71c99e32019-07-25 15:52:30 -0700829 struct flow_dissector_key_tags *key_tags;
Petar Penkovd58e4682018-09-14 07:46:18 -0700830
831 key_control = skb_flow_dissector_target(flow_dissector,
832 FLOW_DISSECTOR_KEY_CONTROL,
833 target_container);
834 key_control->thoff = flow_keys->thoff;
835 if (flow_keys->is_frag)
836 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
837 if (flow_keys->is_first_frag)
838 key_control->flags |= FLOW_DIS_FIRST_FRAG;
839 if (flow_keys->is_encap)
840 key_control->flags |= FLOW_DIS_ENCAPSULATION;
841
842 key_basic = skb_flow_dissector_target(flow_dissector,
843 FLOW_DISSECTOR_KEY_BASIC,
844 target_container);
845 key_basic->n_proto = flow_keys->n_proto;
846 key_basic->ip_proto = flow_keys->ip_proto;
847
848 if (flow_keys->addr_proto == ETH_P_IP &&
849 dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
850 key_addrs = skb_flow_dissector_target(flow_dissector,
851 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
852 target_container);
853 key_addrs->v4addrs.src = flow_keys->ipv4_src;
854 key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
855 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
856 } else if (flow_keys->addr_proto == ETH_P_IPV6 &&
857 dissector_uses_key(flow_dissector,
858 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
859 key_addrs = skb_flow_dissector_target(flow_dissector,
860 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
861 target_container);
Gustavo A. R. Silva1e3d9762021-04-16 14:31:51 -0500862 memcpy(&key_addrs->v6addrs.src, &flow_keys->ipv6_src,
863 sizeof(key_addrs->v6addrs.src));
864 memcpy(&key_addrs->v6addrs.dst, &flow_keys->ipv6_dst,
865 sizeof(key_addrs->v6addrs.dst));
Petar Penkovd58e4682018-09-14 07:46:18 -0700866 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
867 }
868
Yoshiki Komachi59fb9b62020-01-17 16:05:32 +0900869 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS))
Petar Penkovd58e4682018-09-14 07:46:18 -0700870 key_ports = skb_flow_dissector_target(flow_dissector,
871 FLOW_DISSECTOR_KEY_PORTS,
872 target_container);
Yoshiki Komachi59fb9b62020-01-17 16:05:32 +0900873 else if (dissector_uses_key(flow_dissector,
874 FLOW_DISSECTOR_KEY_PORTS_RANGE))
875 key_ports = skb_flow_dissector_target(flow_dissector,
876 FLOW_DISSECTOR_KEY_PORTS_RANGE,
877 target_container);
878
879 if (key_ports) {
Petar Penkovd58e4682018-09-14 07:46:18 -0700880 key_ports->src = flow_keys->sport;
881 key_ports->dst = flow_keys->dport;
882 }
Stanislav Fomichev71c99e32019-07-25 15:52:30 -0700883
884 if (dissector_uses_key(flow_dissector,
885 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
886 key_tags = skb_flow_dissector_target(flow_dissector,
887 FLOW_DISSECTOR_KEY_FLOW_LABEL,
888 target_container);
889 key_tags->flow_label = ntohl(flow_keys->flow_label);
890 }
Petar Penkovd58e4682018-09-14 07:46:18 -0700891}
892
Shmulik Ladkani0ba98502022-08-21 14:35:16 +0300893u32 bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
894 __be16 proto, int nhoff, int hlen, unsigned int flags)
Stanislav Fomichev089b19a2019-04-22 08:55:44 -0700895{
896 struct bpf_flow_keys *flow_keys = ctx->flow_keys;
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -0800897 u32 result;
898
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -0800899 /* Pass parameters to the BPF program */
900 memset(flow_keys, 0, sizeof(*flow_keys));
Stanislav Fomichev089b19a2019-04-22 08:55:44 -0700901 flow_keys->n_proto = proto;
902 flow_keys->nhoff = nhoff;
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -0800903 flow_keys->thoff = flow_keys->nhoff;
904
Stanislav Fomichev086f9562019-07-25 15:52:25 -0700905 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
906 (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
907 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
908 (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
909 BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
910 (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
911 flow_keys->flags = flags;
912
David Miller3d9f773c2020-02-24 15:01:43 +0100913 result = bpf_prog_run_pin_on_cpu(prog, ctx);
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -0800914
Stanislav Fomichev089b19a2019-04-22 08:55:44 -0700915 flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -0800916 flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
Stanislav Fomichev089b19a2019-04-22 08:55:44 -0700917 flow_keys->nhoff, hlen);
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -0800918
Shmulik Ladkani0ba98502022-08-21 14:35:16 +0300919 return result;
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -0800920}
921
Linus Torvaldsf86d1fb2022-08-03 16:29:08 -0700922static bool is_pppoe_ses_hdr_valid(const struct pppoe_hdr *hdr)
Wojciech Drewek46126db2022-07-18 14:18:10 +0200923{
Linus Torvaldsf86d1fb2022-08-03 16:29:08 -0700924 return hdr->ver == 1 && hdr->type == 1 && hdr->code == 0;
Wojciech Drewek46126db2022-07-18 14:18:10 +0200925}
926
WANG Cong453a9402014-08-25 17:03:47 -0700927/**
928 * __skb_flow_dissect - extract the flow_keys struct and return it
Stanislav Fomichev3cbf4ff2019-04-22 08:55:46 -0700929 * @net: associated network namespace, derived from @skb if NULL
WANG Cong453a9402014-08-25 17:03:47 -0700930 * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
Jiri Pirko06635a32015-05-12 14:56:16 +0200931 * @flow_dissector: list of keys to dissect
932 * @target_container: target structure to put dissected values into
WANG Cong453a9402014-08-25 17:03:47 -0700933 * @data: raw buffer pointer to the packet, if NULL use skb->data
934 * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
935 * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
936 * @hlen: packet header length, if @data is NULL use skb_headlen(skb)
Bart Van Assched79b3ba2019-03-25 09:17:21 -0700937 * @flags: flags that control the dissection process, e.g.
Stanislav Fomichev1cc26452019-05-31 14:05:06 -0700938 * FLOW_DISSECTOR_F_STOP_AT_ENCAP.
WANG Cong453a9402014-08-25 17:03:47 -0700939 *
Jiri Pirko06635a32015-05-12 14:56:16 +0200940 * The function will try to retrieve individual keys into target specified
941 * by flow_dissector from either the skbuff or a raw buffer specified by the
942 * rest parameters.
943 *
944 * Caller must take care of zeroing target container memory.
WANG Cong453a9402014-08-25 17:03:47 -0700945 */
Stanislav Fomichev3cbf4ff2019-04-22 08:55:46 -0700946bool __skb_flow_dissect(const struct net *net,
947 const struct sk_buff *skb,
Jiri Pirko06635a32015-05-12 14:56:16 +0200948 struct flow_dissector *flow_dissector,
Alexander Lobakinf96533c2021-03-14 11:11:23 +0000949 void *target_container, const void *data,
950 __be16 proto, int nhoff, int hlen, unsigned int flags)
Eric Dumazet0744dd02011-11-28 05:22:18 +0000951{
Tom Herbert42aecaa2015-06-04 09:16:39 -0700952 struct flow_dissector_key_control *key_control;
Jiri Pirko06635a32015-05-12 14:56:16 +0200953 struct flow_dissector_key_basic *key_basic;
954 struct flow_dissector_key_addrs *key_addrs;
Tom Herbertd34af822015-06-04 09:16:43 -0700955 struct flow_dissector_key_tags *key_tags;
Hadar Hen Zionf6a66922016-08-17 13:36:11 +0300956 struct flow_dissector_key_vlan *key_vlan;
Tom Herbert3a1214e2017-09-01 14:04:11 -0700957 enum flow_dissect_ret fdret;
Jianbo Liu24c590e2018-07-06 05:38:14 +0000958 enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
Guillaume Nault58cff782020-05-26 14:29:00 +0200959 bool mpls_el = false;
960 int mpls_lse = 0;
Tom Herbert1eed4df2017-09-01 14:04:12 -0700961 int num_hdrs = 0;
Geert Uytterhoeven8e690ff2015-06-25 15:10:32 +0200962 u8 ip_proto = 0;
Eric Dumazet34fad542016-11-09 16:04:46 -0800963 bool ret;
Eric Dumazet0744dd02011-11-28 05:22:18 +0000964
David S. Miller690e36e2014-08-23 12:13:41 -0700965 if (!data) {
966 data = skb->data;
Hadar Hen Ziond5709f72016-08-17 13:36:10 +0300967 proto = skb_vlan_tag_present(skb) ?
968 skb->vlan_proto : skb->protocol;
WANG Cong453a9402014-08-25 17:03:47 -0700969 nhoff = skb_network_offset(skb);
David S. Miller690e36e2014-08-23 12:13:41 -0700970 hlen = skb_headlen(skb);
John Crispin2d5716452017-08-10 10:09:03 +0200971#if IS_ENABLED(CONFIG_NET_DSA)
Alexander Lobakin8bef0af2019-12-05 13:02:35 +0300972 if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
973 proto == htons(ETH_P_XDSA))) {
Felix Fietkau570d0a582022-11-14 13:42:11 +0100974 struct metadata_dst *md_dst = skb_metadata_dst(skb);
John Crispin43e66522017-08-09 14:41:19 +0200975 const struct dsa_device_ops *ops;
Alexander Lobakin8bef0af2019-12-05 13:02:35 +0300976 int offset = 0;
John Crispin43e66522017-08-09 14:41:19 +0200977
978 ops = skb->dev->dsa_ptr->tag_ops;
Vladimir Olteanec133572021-06-14 16:58:19 +0300979 /* Only DSA header taggers break flow dissection */
Felix Fietkau570d0a582022-11-14 13:42:11 +0100980 if (ops->needed_headroom &&
981 (!md_dst || md_dst->type != METADATA_HW_PORT_MUX)) {
Vladimir Oltean54fec332020-09-26 22:32:08 +0300982 if (ops->flow_dissect)
983 ops->flow_dissect(skb, &proto, &offset);
984 else
985 dsa_tag_generic_flow_dissect(skb,
986 &proto,
987 &offset);
John Crispin43e66522017-08-09 14:41:19 +0200988 hlen -= offset;
989 nhoff += offset;
990 }
991 }
John Crispin2d5716452017-08-10 10:09:03 +0200992#endif
David S. Miller690e36e2014-08-23 12:13:41 -0700993 }
994
Tom Herbert42aecaa2015-06-04 09:16:39 -0700995 /* It is ensured by skb_flow_dissector_init() that control key will
996 * be always present.
997 */
998 key_control = skb_flow_dissector_target(flow_dissector,
999 FLOW_DISSECTOR_KEY_CONTROL,
1000 target_container);
1001
Jiri Pirko06635a32015-05-12 14:56:16 +02001002 /* It is ensured by skb_flow_dissector_init() that basic key will
1003 * be always present.
1004 */
1005 key_basic = skb_flow_dissector_target(flow_dissector,
1006 FLOW_DISSECTOR_KEY_BASIC,
1007 target_container);
Eric Dumazet0744dd02011-11-28 05:22:18 +00001008
Willem de Bruijnd0e13a12018-09-24 16:49:57 -04001009 if (skb) {
Stanislav Fomichev3cbf4ff2019-04-22 08:55:46 -07001010 if (!net) {
1011 if (skb->dev)
1012 net = dev_net(skb->dev);
1013 else if (skb->sk)
1014 net = sock_net(skb->sk);
Stanislav Fomichev3cbf4ff2019-04-22 08:55:46 -07001015 }
Stanislav Fomichev9b52e3f2019-04-22 08:55:47 -07001016 }
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -08001017
Stanislav Fomichev9b52e3f2019-04-22 08:55:47 -07001018 WARN_ON_ONCE(!net);
1019 if (net) {
Jakub Sitnickia3fd7ce2020-05-31 10:28:36 +02001020 enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
Jakub Sitnicki695c1212020-06-25 16:13:55 +02001021 struct bpf_prog_array *run_array;
Jakub Sitnickia3fd7ce2020-05-31 10:28:36 +02001022
Stanislav Fomichev9b52e3f2019-04-22 08:55:47 -07001023 rcu_read_lock();
Jakub Sitnicki695c1212020-06-25 16:13:55 +02001024 run_array = rcu_dereference(init_net.bpf.run_array[type]);
1025 if (!run_array)
1026 run_array = rcu_dereference(net->bpf.run_array[type]);
Stanislav Fomicheva11c3972019-10-07 09:21:02 -07001027
Jakub Sitnicki695c1212020-06-25 16:13:55 +02001028 if (run_array) {
Stanislav Fomichev9b52e3f2019-04-22 08:55:47 -07001029 struct bpf_flow_keys flow_keys;
1030 struct bpf_flow_dissector ctx = {
1031 .flow_keys = &flow_keys,
1032 .data = data,
1033 .data_end = data + hlen,
1034 };
1035 __be16 n_proto = proto;
Jakub Sitnicki695c1212020-06-25 16:13:55 +02001036 struct bpf_prog *prog;
Shmulik Ladkani0ba98502022-08-21 14:35:16 +03001037 u32 result;
Stanislav Fomichev9b52e3f2019-04-22 08:55:47 -07001038
1039 if (skb) {
1040 ctx.skb = skb;
1041 /* we can't use 'proto' in the skb case
1042 * because it might be set to skb->vlan_proto
1043 * which has been pulled from the data
1044 */
1045 n_proto = skb->protocol;
1046 }
1047
Jakub Sitnicki695c1212020-06-25 16:13:55 +02001048 prog = READ_ONCE(run_array->items[0].prog);
Shmulik Ladkani0ba98502022-08-21 14:35:16 +03001049 result = bpf_flow_dissect(prog, &ctx, n_proto, nhoff,
1050 hlen, flags);
Shmulik Ladkani91350fe2022-08-21 14:35:17 +03001051 if (result == BPF_FLOW_DISSECTOR_CONTINUE)
1052 goto dissect_continue;
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -08001053 __skb_flow_bpf_to_target(&flow_keys, flow_dissector,
1054 target_container);
1055 rcu_read_unlock();
Shmulik Ladkani0ba98502022-08-21 14:35:16 +03001056 return result == BPF_OK;
Stanislav Fomichevc8aa7032019-01-28 08:53:53 -08001057 }
Shmulik Ladkani91350fe2022-08-21 14:35:17 +03001058dissect_continue:
Petar Penkovd58e4682018-09-14 07:46:18 -07001059 rcu_read_unlock();
Petar Penkovd58e4682018-09-14 07:46:18 -07001060 }
Petar Penkovd58e4682018-09-14 07:46:18 -07001061
David S. Miller20a17bf2015-09-01 21:19:17 -07001062 if (dissector_uses_key(flow_dissector,
1063 FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
Jiri Pirko67a900c2015-05-12 14:56:19 +02001064 struct ethhdr *eth = eth_hdr(skb);
1065 struct flow_dissector_key_eth_addrs *key_eth_addrs;
1066
1067 key_eth_addrs = skb_flow_dissector_target(flow_dissector,
1068 FLOW_DISSECTOR_KEY_ETH_ADDRS,
1069 target_container);
Jakub Kicinski1b808992022-04-06 14:15:21 -07001070 memcpy(key_eth_addrs, eth, sizeof(*key_eth_addrs));
Jiri Pirko67a900c2015-05-12 14:56:19 +02001071 }
1072
Boris Sukholitko34951fc2022-04-19 11:14:32 +03001073 if (dissector_uses_key(flow_dissector,
1074 FLOW_DISSECTOR_KEY_NUM_OF_VLANS)) {
1075 struct flow_dissector_key_num_of_vlans *key_num_of_vlans;
1076
1077 key_num_of_vlans = skb_flow_dissector_target(flow_dissector,
1078 FLOW_DISSECTOR_KEY_NUM_OF_VLANS,
1079 target_container);
1080 key_num_of_vlans->num_of_vlans = 0;
1081 }
1082
Jiri Pirkoc5ef1882017-03-06 16:39:54 +01001083proto_again:
Tom Herbert3a1214e2017-09-01 14:04:11 -07001084 fdret = FLOW_DISSECT_RET_CONTINUE;
1085
Eric Dumazet0744dd02011-11-28 05:22:18 +00001086 switch (proto) {
Joe Perches2b8837a2014-03-12 10:04:17 -07001087 case htons(ETH_P_IP): {
Eric Dumazet0744dd02011-11-28 05:22:18 +00001088 const struct iphdr *iph;
1089 struct iphdr _iph;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001090
David S. Miller690e36e2014-08-23 12:13:41 -07001091 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
Tom Herbert3a1214e2017-09-01 14:04:11 -07001092 if (!iph || iph->ihl < 5) {
1093 fdret = FLOW_DISSECT_RET_OUT_BAD;
1094 break;
1095 }
1096
Eric Dumazet3797d3e2013-11-07 08:37:28 -08001097 nhoff += iph->ihl * 4;
Eric Dumazet0744dd02011-11-28 05:22:18 +00001098
Eric Dumazet3797d3e2013-11-07 08:37:28 -08001099 ip_proto = iph->protocol;
Eric Dumazet3797d3e2013-11-07 08:37:28 -08001100
Alexander Duyck918c0232016-02-24 09:29:38 -08001101 if (dissector_uses_key(flow_dissector,
1102 FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
1103 key_addrs = skb_flow_dissector_target(flow_dissector,
1104 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1105 target_container);
Tom Herbertc3f83242015-06-04 09:16:40 -07001106
Gustavo A. R. Silva323e0cb2021-07-26 14:25:11 -05001107 memcpy(&key_addrs->v4addrs.src, &iph->saddr,
1108 sizeof(key_addrs->v4addrs.src));
1109 memcpy(&key_addrs->v4addrs.dst, &iph->daddr,
1110 sizeof(key_addrs->v4addrs.dst));
Alexander Duyck918c0232016-02-24 09:29:38 -08001111 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
1112 }
Tom Herbert807e1652015-09-01 09:24:28 -07001113
Davide Carattid2126832021-02-12 16:12:25 +01001114 __skb_flow_dissect_ipv4(skb, flow_dissector,
1115 target_container, data, iph);
1116
Tom Herbert807e1652015-09-01 09:24:28 -07001117 if (ip_is_fragment(iph)) {
David S. Miller4b369932015-09-01 16:46:08 -07001118 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
Tom Herbert807e1652015-09-01 09:24:28 -07001119
1120 if (iph->frag_off & htons(IP_OFFSET)) {
Tom Herbert3a1214e2017-09-01 14:04:11 -07001121 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1122 break;
Tom Herbert807e1652015-09-01 09:24:28 -07001123 } else {
David S. Miller4b369932015-09-01 16:46:08 -07001124 key_control->flags |= FLOW_DIS_FIRST_FRAG;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001125 if (!(flags &
1126 FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
1127 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1128 break;
1129 }
Tom Herbert807e1652015-09-01 09:24:28 -07001130 }
1131 }
1132
Eric Dumazet0744dd02011-11-28 05:22:18 +00001133 break;
1134 }
Joe Perches2b8837a2014-03-12 10:04:17 -07001135 case htons(ETH_P_IPV6): {
Eric Dumazet0744dd02011-11-28 05:22:18 +00001136 const struct ipv6hdr *iph;
1137 struct ipv6hdr _iph;
Tom Herbert19469a82014-07-01 21:33:01 -07001138
David S. Miller690e36e2014-08-23 12:13:41 -07001139 iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
Tom Herbert3a1214e2017-09-01 14:04:11 -07001140 if (!iph) {
1141 fdret = FLOW_DISSECT_RET_OUT_BAD;
1142 break;
1143 }
Eric Dumazet0744dd02011-11-28 05:22:18 +00001144
1145 ip_proto = iph->nexthdr;
Eric Dumazet0744dd02011-11-28 05:22:18 +00001146 nhoff += sizeof(struct ipv6hdr);
Tom Herbert19469a82014-07-01 21:33:01 -07001147
David S. Miller20a17bf2015-09-01 21:19:17 -07001148 if (dissector_uses_key(flow_dissector,
1149 FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
Alexander Duyckb3c31062016-02-24 09:29:57 -08001150 key_addrs = skb_flow_dissector_target(flow_dissector,
1151 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1152 target_container);
Alexander Duyck5af7fb62014-10-10 12:09:12 -07001153
Gustavo A. R. Silva323e0cb2021-07-26 14:25:11 -05001154 memcpy(&key_addrs->v6addrs.src, &iph->saddr,
1155 sizeof(key_addrs->v6addrs.src));
1156 memcpy(&key_addrs->v6addrs.dst, &iph->daddr,
1157 sizeof(key_addrs->v6addrs.dst));
Tom Herbertc3f83242015-06-04 09:16:40 -07001158 key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
Jiri Pirkob9249332015-05-12 14:56:18 +02001159 }
Tom Herbert87ee9e52015-06-04 09:16:44 -07001160
Alexander Duyck461547f2016-02-09 02:49:54 -08001161 if ((dissector_uses_key(flow_dissector,
1162 FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
1163 (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
1164 ip6_flowlabel(iph)) {
1165 __be32 flow_label = ip6_flowlabel(iph);
1166
David S. Miller20a17bf2015-09-01 21:19:17 -07001167 if (dissector_uses_key(flow_dissector,
1168 FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
Tom Herbert87ee9e52015-06-04 09:16:44 -07001169 key_tags = skb_flow_dissector_target(flow_dissector,
1170 FLOW_DISSECTOR_KEY_FLOW_LABEL,
1171 target_container);
1172 key_tags->flow_label = ntohl(flow_label);
Jiri Pirko12c227e2015-05-22 11:05:58 +02001173 }
Tom Herbert3a1214e2017-09-01 14:04:11 -07001174 if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
1175 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1176 break;
1177 }
Tom Herbert19469a82014-07-01 21:33:01 -07001178 }
1179
Or Gerlitz518d8a22017-06-01 21:37:37 +03001180 __skb_flow_dissect_ipv6(skb, flow_dissector,
1181 target_container, data, iph);
1182
Eric Dumazet0744dd02011-11-28 05:22:18 +00001183 break;
1184 }
Joe Perches2b8837a2014-03-12 10:04:17 -07001185 case htons(ETH_P_8021AD):
1186 case htons(ETH_P_8021Q): {
Jianbo Liu24c590e2018-07-06 05:38:14 +00001187 const struct vlan_hdr *vlan = NULL;
Arnd Bergmannbc72f3d2016-10-24 23:40:30 +02001188 struct vlan_hdr _vlan;
Jianbo Liu2064c3d2018-07-06 05:38:12 +00001189 __be16 saved_vlan_tpid = proto;
Eric Dumazet0744dd02011-11-28 05:22:18 +00001190
Jianbo Liu24c590e2018-07-06 05:38:14 +00001191 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
1192 skb && skb_vlan_tag_present(skb)) {
Hadar Hen Ziond5709f72016-08-17 13:36:10 +03001193 proto = skb->protocol;
Jianbo Liu24c590e2018-07-06 05:38:14 +00001194 } else {
Hadar Hen Ziond5709f72016-08-17 13:36:10 +03001195 vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
1196 data, hlen, &_vlan);
Tom Herbert3a1214e2017-09-01 14:04:11 -07001197 if (!vlan) {
1198 fdret = FLOW_DISSECT_RET_OUT_BAD;
1199 break;
1200 }
1201
Hadar Hen Ziond5709f72016-08-17 13:36:10 +03001202 proto = vlan->h_vlan_encapsulated_proto;
1203 nhoff += sizeof(*vlan);
Hadar Hen Ziond5709f72016-08-17 13:36:10 +03001204 }
1205
Qingqing Yang9f87eb42022-09-19 15:48:08 +08001206 if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_NUM_OF_VLANS) &&
1207 !(key_control->flags & FLOW_DIS_ENCAPSULATION)) {
Boris Sukholitko34951fc2022-04-19 11:14:32 +03001208 struct flow_dissector_key_num_of_vlans *key_nvs;
1209
1210 key_nvs = skb_flow_dissector_target(flow_dissector,
1211 FLOW_DISSECTOR_KEY_NUM_OF_VLANS,
1212 target_container);
1213 key_nvs->num_of_vlans++;
1214 }
1215
Jianbo Liu24c590e2018-07-06 05:38:14 +00001216 if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
1217 dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
1218 } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
1219 dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
1220 } else {
1221 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1222 break;
1223 }
1224
1225 if (dissector_uses_key(flow_dissector, dissector_vlan)) {
Hadar Hen Zionf6a66922016-08-17 13:36:11 +03001226 key_vlan = skb_flow_dissector_target(flow_dissector,
Jianbo Liu24c590e2018-07-06 05:38:14 +00001227 dissector_vlan,
Tom Herbertd34af822015-06-04 09:16:43 -07001228 target_container);
1229
Jianbo Liu24c590e2018-07-06 05:38:14 +00001230 if (!vlan) {
Hadar Hen Zionf6a66922016-08-17 13:36:11 +03001231 key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
Michał Mirosław9b319142018-11-07 18:07:03 +01001232 key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
Hadar Hen Zionf6a66922016-08-17 13:36:11 +03001233 } else {
1234 key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
Hadar Hen Ziond5709f72016-08-17 13:36:10 +03001235 VLAN_VID_MASK;
Hadar Hen Zionf6a66922016-08-17 13:36:11 +03001236 key_vlan->vlan_priority =
1237 (ntohs(vlan->h_vlan_TCI) &
1238 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1239 }
Jianbo Liu2064c3d2018-07-06 05:38:12 +00001240 key_vlan->vlan_tpid = saved_vlan_tpid;
Vlad Buslov2105f702022-04-06 14:22:41 +03001241 key_vlan->vlan_eth_type = proto;
Tom Herbertd34af822015-06-04 09:16:43 -07001242 }
1243
Tom Herbert3a1214e2017-09-01 14:04:11 -07001244 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1245 break;
Eric Dumazet0744dd02011-11-28 05:22:18 +00001246 }
Joe Perches2b8837a2014-03-12 10:04:17 -07001247 case htons(ETH_P_PPP_SES): {
Eric Dumazet0744dd02011-11-28 05:22:18 +00001248 struct {
1249 struct pppoe_hdr hdr;
1250 __be16 proto;
1251 } *hdr, _hdr;
Wojciech Drewek46126db2022-07-18 14:18:10 +02001252 u16 ppp_proto;
1253
David S. Miller690e36e2014-08-23 12:13:41 -07001254 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
Tom Herbert3a1214e2017-09-01 14:04:11 -07001255 if (!hdr) {
1256 fdret = FLOW_DISSECT_RET_OUT_BAD;
1257 break;
1258 }
1259
Linus Torvaldsf86d1fb2022-08-03 16:29:08 -07001260 if (!is_pppoe_ses_hdr_valid(&hdr->hdr)) {
Tom Herbert3a1214e2017-09-01 14:04:11 -07001261 fdret = FLOW_DISSECT_RET_OUT_BAD;
1262 break;
Eric Dumazet0744dd02011-11-28 05:22:18 +00001263 }
Wojciech Drewek46126db2022-07-18 14:18:10 +02001264
1265 /* least significant bit of the most significant octet
1266 * indicates if protocol field was compressed
1267 */
1268 ppp_proto = ntohs(hdr->proto);
1269 if (ppp_proto & 0x0100) {
1270 ppp_proto = ppp_proto >> 8;
1271 nhoff += PPPOE_SES_HLEN - 1;
1272 } else {
1273 nhoff += PPPOE_SES_HLEN;
1274 }
1275
1276 if (ppp_proto == PPP_IP) {
1277 proto = htons(ETH_P_IP);
1278 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1279 } else if (ppp_proto == PPP_IPV6) {
1280 proto = htons(ETH_P_IPV6);
1281 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1282 } else if (ppp_proto == PPP_MPLS_UC) {
1283 proto = htons(ETH_P_MPLS_UC);
1284 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1285 } else if (ppp_proto == PPP_MPLS_MC) {
1286 proto = htons(ETH_P_MPLS_MC);
1287 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1288 } else if (ppp_proto_is_valid(ppp_proto)) {
1289 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1290 } else {
1291 fdret = FLOW_DISSECT_RET_OUT_BAD;
1292 break;
1293 }
1294
1295 if (dissector_uses_key(flow_dissector,
1296 FLOW_DISSECTOR_KEY_PPPOE)) {
1297 struct flow_dissector_key_pppoe *key_pppoe;
1298
1299 key_pppoe = skb_flow_dissector_target(flow_dissector,
1300 FLOW_DISSECTOR_KEY_PPPOE,
1301 target_container);
1302 key_pppoe->session_id = hdr->hdr.sid;
1303 key_pppoe->ppp_proto = htons(ppp_proto);
1304 key_pppoe->type = htons(ETH_P_PPP_SES);
1305 }
Tom Herbert3a1214e2017-09-01 14:04:11 -07001306 break;
Eric Dumazet0744dd02011-11-28 05:22:18 +00001307 }
Erik Hugne08bfc9c2015-01-22 17:10:32 +01001308 case htons(ETH_P_TIPC): {
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001309 struct tipc_basic_hdr *hdr, _hdr;
1310
1311 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
1312 data, hlen, &_hdr);
Tom Herbert3a1214e2017-09-01 14:04:11 -07001313 if (!hdr) {
1314 fdret = FLOW_DISSECT_RET_OUT_BAD;
1315 break;
1316 }
Jiri Pirko06635a32015-05-12 14:56:16 +02001317
David S. Miller20a17bf2015-09-01 21:19:17 -07001318 if (dissector_uses_key(flow_dissector,
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001319 FLOW_DISSECTOR_KEY_TIPC)) {
Jiri Pirko06635a32015-05-12 14:56:16 +02001320 key_addrs = skb_flow_dissector_target(flow_dissector,
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001321 FLOW_DISSECTOR_KEY_TIPC,
Jiri Pirko06635a32015-05-12 14:56:16 +02001322 target_container);
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001323 key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
1324 key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
Jiri Pirko06635a32015-05-12 14:56:16 +02001325 }
Tom Herbert3a1214e2017-09-01 14:04:11 -07001326 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1327 break;
Erik Hugne08bfc9c2015-01-22 17:10:32 +01001328 }
Tom Herbertb3baa0f2015-06-04 09:16:46 -07001329
1330 case htons(ETH_P_MPLS_UC):
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +01001331 case htons(ETH_P_MPLS_MC):
Tom Herbert3a1214e2017-09-01 14:04:11 -07001332 fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
Jiri Pirko4a5d6c8b2017-03-06 16:39:52 +01001333 target_container, data,
Guillaume Nault58cff782020-05-26 14:29:00 +02001334 nhoff, hlen, mpls_lse,
1335 &mpls_el);
1336 nhoff += sizeof(struct mpls_label);
1337 mpls_lse++;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001338 break;
Alexander Duyck56193d12014-09-05 19:20:26 -04001339 case htons(ETH_P_FCOE):
Tom Herbert3a1214e2017-09-01 14:04:11 -07001340 if ((hlen - nhoff) < FCOE_HEADER_LEN) {
1341 fdret = FLOW_DISSECT_RET_OUT_BAD;
1342 break;
1343 }
Alexander Duyck224516b2016-02-24 09:29:51 -08001344
1345 nhoff += FCOE_HEADER_LEN;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001346 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1347 break;
Simon Horman55733352017-01-11 14:05:42 +01001348
1349 case htons(ETH_P_ARP):
Jiri Pirko9bf881f2017-03-06 16:39:51 +01001350 case htons(ETH_P_RARP):
Tom Herbert3a1214e2017-09-01 14:04:11 -07001351 fdret = __skb_flow_dissect_arp(skb, flow_dissector,
Jiri Pirko9bf881f2017-03-06 16:39:51 +01001352 target_container, data,
Tom Herbert3a1214e2017-09-01 14:04:11 -07001353 nhoff, hlen);
1354 break;
1355
Sven Eckelmann5b0890a2017-12-21 10:17:42 +01001356 case htons(ETH_P_BATMAN):
1357 fdret = __skb_flow_dissect_batadv(skb, key_control, data,
1358 &proto, &nhoff, hlen, flags);
1359 break;
1360
Eran Ben Elisha4f1cc512021-01-12 21:07:13 +02001361 case htons(ETH_P_1588): {
1362 struct ptp_header *hdr, _hdr;
1363
1364 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
1365 hlen, &_hdr);
1366 if (!hdr) {
1367 fdret = FLOW_DISSECT_RET_OUT_BAD;
1368 break;
1369 }
1370
1371 nhoff += ntohs(hdr->message_length);
1372 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1373 break;
1374 }
1375
Kurt Kanzenbachf65e5842022-03-10 08:35:05 +01001376 case htons(ETH_P_PRP):
Kurt Kanzenbachbf088242022-02-28 20:58:56 +01001377 case htons(ETH_P_HSR): {
1378 struct hsr_tag *hdr, _hdr;
1379
1380 hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen,
1381 &_hdr);
1382 if (!hdr) {
1383 fdret = FLOW_DISSECT_RET_OUT_BAD;
1384 break;
1385 }
1386
1387 proto = hdr->encap_proto;
1388 nhoff += HSR_HLEN;
1389 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1390 break;
1391 }
1392
Tom Herbert3a1214e2017-09-01 14:04:11 -07001393 default:
1394 fdret = FLOW_DISSECT_RET_OUT_BAD;
1395 break;
1396 }
1397
1398 /* Process result of proto processing */
1399 switch (fdret) {
1400 case FLOW_DISSECT_RET_OUT_GOOD:
1401 goto out_good;
1402 case FLOW_DISSECT_RET_PROTO_AGAIN:
Tom Herbert1eed4df2017-09-01 14:04:12 -07001403 if (skb_flow_dissect_allowed(&num_hdrs))
1404 goto proto_again;
1405 goto out_good;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001406 case FLOW_DISSECT_RET_CONTINUE:
1407 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
1408 break;
1409 case FLOW_DISSECT_RET_OUT_BAD:
Eric Dumazet0744dd02011-11-28 05:22:18 +00001410 default:
Tom Herberta6e544b2015-09-01 09:24:26 -07001411 goto out_bad;
Eric Dumazet0744dd02011-11-28 05:22:18 +00001412 }
1413
Tom Herbert6a74fcf2015-06-12 09:01:06 -07001414ip_proto_again:
Tom Herbert3a1214e2017-09-01 14:04:11 -07001415 fdret = FLOW_DISSECT_RET_CONTINUE;
1416
Eric Dumazet0744dd02011-11-28 05:22:18 +00001417 switch (ip_proto) {
Jiri Pirko7c92de82017-03-06 16:39:55 +01001418 case IPPROTO_GRE:
Yoshiki Komachi6de6e462021-10-29 09:21:41 +00001419 if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1420 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1421 break;
1422 }
1423
Tom Herbert3a1214e2017-09-01 14:04:11 -07001424 fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
Jiri Pirko7c92de82017-03-06 16:39:55 +01001425 target_container, data,
Tom Herbert3a1214e2017-09-01 14:04:11 -07001426 &proto, &nhoff, &hlen, flags);
1427 break;
1428
Tom Herbert6a74fcf2015-06-12 09:01:06 -07001429 case NEXTHDR_HOP:
1430 case NEXTHDR_ROUTING:
1431 case NEXTHDR_DEST: {
1432 u8 _opthdr[2], *opthdr;
1433
1434 if (proto != htons(ETH_P_IPV6))
1435 break;
1436
1437 opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
1438 data, hlen, &_opthdr);
Tom Herbert3a1214e2017-09-01 14:04:11 -07001439 if (!opthdr) {
1440 fdret = FLOW_DISSECT_RET_OUT_BAD;
1441 break;
1442 }
Tom Herbert6a74fcf2015-06-12 09:01:06 -07001443
Eric Dumazet1e98a0f2015-06-12 19:31:32 -07001444 ip_proto = opthdr[0];
1445 nhoff += (opthdr[1] + 1) << 3;
Tom Herbert6a74fcf2015-06-12 09:01:06 -07001446
Tom Herbert3a1214e2017-09-01 14:04:11 -07001447 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1448 break;
Tom Herbert6a74fcf2015-06-12 09:01:06 -07001449 }
Tom Herbertb840f282015-09-01 09:24:29 -07001450 case NEXTHDR_FRAGMENT: {
1451 struct frag_hdr _fh, *fh;
1452
1453 if (proto != htons(ETH_P_IPV6))
1454 break;
1455
1456 fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
1457 data, hlen, &_fh);
1458
Tom Herbert3a1214e2017-09-01 14:04:11 -07001459 if (!fh) {
1460 fdret = FLOW_DISSECT_RET_OUT_BAD;
1461 break;
1462 }
Tom Herbertb840f282015-09-01 09:24:29 -07001463
David S. Miller4b369932015-09-01 16:46:08 -07001464 key_control->flags |= FLOW_DIS_IS_FRAGMENT;
Tom Herbertb840f282015-09-01 09:24:29 -07001465
1466 nhoff += sizeof(_fh);
Alexander Duyck43d2ccb2016-02-24 09:29:44 -08001467 ip_proto = fh->nexthdr;
Tom Herbertb840f282015-09-01 09:24:29 -07001468
1469 if (!(fh->frag_off & htons(IP6_OFFSET))) {
David S. Miller4b369932015-09-01 16:46:08 -07001470 key_control->flags |= FLOW_DIS_FIRST_FRAG;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001471 if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
1472 fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
1473 break;
1474 }
Tom Herbertb840f282015-09-01 09:24:29 -07001475 }
Tom Herbert3a1214e2017-09-01 14:04:11 -07001476
1477 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1478 break;
Tom Herbertb840f282015-09-01 09:24:29 -07001479 }
Eric Dumazet0744dd02011-11-28 05:22:18 +00001480 case IPPROTO_IPIP:
Yoshiki Komachi6de6e462021-10-29 09:21:41 +00001481 if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1482 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1483 break;
1484 }
1485
Tom Herbertfca41892013-07-29 11:07:36 -07001486 proto = htons(ETH_P_IP);
Tom Herbert823b9692015-09-01 09:24:32 -07001487
David S. Miller4b369932015-09-01 16:46:08 -07001488 key_control->flags |= FLOW_DIS_ENCAPSULATION;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001489 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1490 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1491 break;
1492 }
Tom Herbert823b9692015-09-01 09:24:32 -07001493
Tom Herbert3a1214e2017-09-01 14:04:11 -07001494 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1495 break;
1496
Tom Herbertb438f942013-07-29 11:07:42 -07001497 case IPPROTO_IPV6:
Yoshiki Komachi6de6e462021-10-29 09:21:41 +00001498 if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) {
1499 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1500 break;
1501 }
1502
Tom Herbertb438f942013-07-29 11:07:42 -07001503 proto = htons(ETH_P_IPV6);
Tom Herbert823b9692015-09-01 09:24:32 -07001504
David S. Miller4b369932015-09-01 16:46:08 -07001505 key_control->flags |= FLOW_DIS_ENCAPSULATION;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001506 if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
1507 fdret = FLOW_DISSECT_RET_OUT_GOOD;
1508 break;
1509 }
Tom Herbert823b9692015-09-01 09:24:32 -07001510
Tom Herbert3a1214e2017-09-01 14:04:11 -07001511 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1512 break;
1513
1514
Tom Herbertb3baa0f2015-06-04 09:16:46 -07001515 case IPPROTO_MPLS:
1516 proto = htons(ETH_P_MPLS_UC);
Tom Herbert3a1214e2017-09-01 14:04:11 -07001517 fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
1518 break;
1519
Jiri Pirkoac4bb5d2017-05-23 18:40:44 +02001520 case IPPROTO_TCP:
1521 __skb_flow_dissect_tcp(skb, flow_dissector, target_container,
1522 data, nhoff, hlen);
1523 break;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001524
Matteo Croce3b336d6f2019-10-29 14:50:51 +01001525 case IPPROTO_ICMP:
1526 case IPPROTO_ICMPV6:
1527 __skb_flow_dissect_icmp(skb, flow_dissector, target_container,
1528 data, nhoff, hlen);
1529 break;
Wojciech Drewekdda2fa02022-09-08 10:16:41 -07001530 case IPPROTO_L2TP:
1531 __skb_flow_dissect_l2tpv3(skb, flow_dissector, target_container,
1532 data, nhoff, hlen);
1533 break;
Matteo Croce3b336d6f2019-10-29 14:50:51 +01001534
Eric Dumazet0744dd02011-11-28 05:22:18 +00001535 default:
1536 break;
1537 }
1538
Yoshiki Komachi8ffb0552019-12-03 19:40:12 +09001539 if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT))
1540 __skb_flow_dissect_ports(skb, flow_dissector, target_container,
1541 data, nhoff, ip_proto, hlen);
Alexander Duyck5af7fb62014-10-10 12:09:12 -07001542
Tom Herbert3a1214e2017-09-01 14:04:11 -07001543 /* Process result of IP proto processing */
1544 switch (fdret) {
1545 case FLOW_DISSECT_RET_PROTO_AGAIN:
Tom Herbert1eed4df2017-09-01 14:04:12 -07001546 if (skb_flow_dissect_allowed(&num_hdrs))
1547 goto proto_again;
1548 break;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001549 case FLOW_DISSECT_RET_IPPROTO_AGAIN:
Tom Herbert1eed4df2017-09-01 14:04:12 -07001550 if (skb_flow_dissect_allowed(&num_hdrs))
1551 goto ip_proto_again;
1552 break;
Tom Herbert3a1214e2017-09-01 14:04:11 -07001553 case FLOW_DISSECT_RET_OUT_GOOD:
1554 case FLOW_DISSECT_RET_CONTINUE:
1555 break;
1556 case FLOW_DISSECT_RET_OUT_BAD:
1557 default:
1558 goto out_bad;
1559 }
1560
Tom Herberta6e544b2015-09-01 09:24:26 -07001561out_good:
1562 ret = true;
1563
Eric Dumazet34fad542016-11-09 16:04:46 -08001564out:
Eric Dumazetd0c081b2018-01-17 14:21:13 -08001565 key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
Tom Herberta6e544b2015-09-01 09:24:26 -07001566 key_basic->n_proto = proto;
1567 key_basic->ip_proto = ip_proto;
Tom Herberta6e544b2015-09-01 09:24:26 -07001568
1569 return ret;
Eric Dumazet34fad542016-11-09 16:04:46 -08001570
1571out_bad:
1572 ret = false;
Eric Dumazet34fad542016-11-09 16:04:46 -08001573 goto out;
Eric Dumazet0744dd02011-11-28 05:22:18 +00001574}
David S. Miller690e36e2014-08-23 12:13:41 -07001575EXPORT_SYMBOL(__skb_flow_dissect);
Cong Wang441d9d32013-01-21 00:39:24 +00001576
Eric Dumazet49ecc2e92021-11-15 09:23:03 -08001577static siphash_aligned_key_t hashrnd;
Hannes Frederic Sowa66415cf2013-10-23 20:06:00 +02001578static __always_inline void __flow_hash_secret_init(void)
1579{
1580 net_get_random_once(&hashrnd, sizeof(hashrnd));
1581}
1582
Eric Dumazet55667442019-10-22 07:57:46 -07001583static const void *flow_keys_hash_start(const struct flow_keys *flow)
Hannes Frederic Sowa66415cf2013-10-23 20:06:00 +02001584{
Eric Dumazet55667442019-10-22 07:57:46 -07001585 BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT);
1586 return &flow->FLOW_KEYS_HASH_START_FIELD;
Tom Herbert42aecaa2015-06-04 09:16:39 -07001587}
1588
David S. Miller20a17bf2015-09-01 21:19:17 -07001589static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
Tom Herbert42aecaa2015-06-04 09:16:39 -07001590{
Tom Herbertc3f83242015-06-04 09:16:40 -07001591 size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
David S. Millerd31e9552019-11-02 13:12:51 -07001592
Tom Herbert42aecaa2015-06-04 09:16:39 -07001593 BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
Tom Herbertc3f83242015-06-04 09:16:40 -07001594
1595 switch (flow->control.addr_type) {
1596 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1597 diff -= sizeof(flow->addrs.v4addrs);
1598 break;
1599 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1600 diff -= sizeof(flow->addrs.v6addrs);
1601 break;
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001602 case FLOW_DISSECTOR_KEY_TIPC:
1603 diff -= sizeof(flow->addrs.tipckey);
Tom Herbert9f249082015-06-04 09:16:41 -07001604 break;
Tom Herbertc3f83242015-06-04 09:16:40 -07001605 }
Eric Dumazet55667442019-10-22 07:57:46 -07001606 return sizeof(*flow) - diff;
Tom Herbertc3f83242015-06-04 09:16:40 -07001607}
1608
1609__be32 flow_get_u32_src(const struct flow_keys *flow)
1610{
1611 switch (flow->control.addr_type) {
1612 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1613 return flow->addrs.v4addrs.src;
1614 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1615 return (__force __be32)ipv6_addr_hash(
1616 &flow->addrs.v6addrs.src);
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001617 case FLOW_DISSECTOR_KEY_TIPC:
1618 return flow->addrs.tipckey.key;
Tom Herbertc3f83242015-06-04 09:16:40 -07001619 default:
1620 return 0;
1621 }
1622}
1623EXPORT_SYMBOL(flow_get_u32_src);
1624
1625__be32 flow_get_u32_dst(const struct flow_keys *flow)
1626{
1627 switch (flow->control.addr_type) {
1628 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
1629 return flow->addrs.v4addrs.dst;
1630 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1631 return (__force __be32)ipv6_addr_hash(
1632 &flow->addrs.v6addrs.dst);
1633 default:
1634 return 0;
1635 }
1636}
1637EXPORT_SYMBOL(flow_get_u32_dst);
1638
zhang kai1e60ceb2021-07-28 18:54:18 +08001639/* Sort the source and destination IP and the ports,
Matteo Croce98298e62019-10-29 14:50:50 +01001640 * to have consistent hash within the two directions
1641 */
Tom Herbertc3f83242015-06-04 09:16:40 -07001642static inline void __flow_hash_consistentify(struct flow_keys *keys)
1643{
1644 int addr_diff, i;
1645
1646 switch (keys->control.addr_type) {
1647 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
Ludovic Cintrat64ae13e2022-09-07 12:08:13 +02001648 if ((__force u32)keys->addrs.v4addrs.dst <
1649 (__force u32)keys->addrs.v4addrs.src)
Tom Herbertc3f83242015-06-04 09:16:40 -07001650 swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
zhang kai1e60ceb2021-07-28 18:54:18 +08001651
1652 if ((__force u16)keys->ports.dst <
1653 (__force u16)keys->ports.src) {
Tom Herbertc3f83242015-06-04 09:16:40 -07001654 swap(keys->ports.src, keys->ports.dst);
1655 }
1656 break;
1657 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
1658 addr_diff = memcmp(&keys->addrs.v6addrs.dst,
1659 &keys->addrs.v6addrs.src,
1660 sizeof(keys->addrs.v6addrs.dst));
zhang kai1e60ceb2021-07-28 18:54:18 +08001661 if (addr_diff < 0) {
Tom Herbertc3f83242015-06-04 09:16:40 -07001662 for (i = 0; i < 4; i++)
1663 swap(keys->addrs.v6addrs.src.s6_addr32[i],
1664 keys->addrs.v6addrs.dst.s6_addr32[i]);
zhang kai1e60ceb2021-07-28 18:54:18 +08001665 }
1666 if ((__force u16)keys->ports.dst <
1667 (__force u16)keys->ports.src) {
Tom Herbertc3f83242015-06-04 09:16:40 -07001668 swap(keys->ports.src, keys->ports.dst);
1669 }
1670 break;
1671 }
Hannes Frederic Sowa66415cf2013-10-23 20:06:00 +02001672}
1673
Eric Dumazet55667442019-10-22 07:57:46 -07001674static inline u32 __flow_hash_from_keys(struct flow_keys *keys,
1675 const siphash_key_t *keyval)
Tom Herbert5ed20a62014-07-01 21:32:05 -07001676{
1677 u32 hash;
1678
Tom Herbertc3f83242015-06-04 09:16:40 -07001679 __flow_hash_consistentify(keys);
Tom Herbert5ed20a62014-07-01 21:32:05 -07001680
Eric Dumazet55667442019-10-22 07:57:46 -07001681 hash = siphash(flow_keys_hash_start(keys),
1682 flow_keys_hash_length(keys), keyval);
Tom Herbert5ed20a62014-07-01 21:32:05 -07001683 if (!hash)
1684 hash = 1;
1685
1686 return hash;
1687}
1688
1689u32 flow_hash_from_keys(struct flow_keys *keys)
1690{
Tom Herbert50fb7992015-05-01 11:30:12 -07001691 __flow_hash_secret_init();
Eric Dumazet55667442019-10-22 07:57:46 -07001692 return __flow_hash_from_keys(keys, &hashrnd);
Tom Herbert5ed20a62014-07-01 21:32:05 -07001693}
1694EXPORT_SYMBOL(flow_hash_from_keys);
1695
Tom Herbert50fb7992015-05-01 11:30:12 -07001696static inline u32 ___skb_get_hash(const struct sk_buff *skb,
Eric Dumazet55667442019-10-22 07:57:46 -07001697 struct flow_keys *keys,
1698 const siphash_key_t *keyval)
Tom Herbert50fb7992015-05-01 11:30:12 -07001699{
Tom Herbert6db61d72015-09-01 09:24:33 -07001700 skb_flow_dissect_flow_keys(skb, keys,
1701 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
Tom Herbert50fb7992015-05-01 11:30:12 -07001702
1703 return __flow_hash_from_keys(keys, keyval);
1704}
1705
Tom Herbert2f59e1e2015-05-01 11:30:17 -07001706struct _flow_keys_digest_data {
1707 __be16 n_proto;
1708 u8 ip_proto;
1709 u8 padding;
1710 __be32 ports;
1711 __be32 src;
1712 __be32 dst;
1713};
1714
1715void make_flow_keys_digest(struct flow_keys_digest *digest,
1716 const struct flow_keys *flow)
1717{
1718 struct _flow_keys_digest_data *data =
1719 (struct _flow_keys_digest_data *)digest;
1720
1721 BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
1722
1723 memset(digest, 0, sizeof(*digest));
1724
Jiri Pirko06635a32015-05-12 14:56:16 +02001725 data->n_proto = flow->basic.n_proto;
1726 data->ip_proto = flow->basic.ip_proto;
1727 data->ports = flow->ports.ports;
Tom Herbertc3f83242015-06-04 09:16:40 -07001728 data->src = flow->addrs.v4addrs.src;
1729 data->dst = flow->addrs.v4addrs.dst;
Tom Herbert2f59e1e2015-05-01 11:30:17 -07001730}
1731EXPORT_SYMBOL(make_flow_keys_digest);
1732
David S. Millereb70db82016-07-01 16:07:50 -04001733static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
1734
Florian Westphalb9177832016-10-26 18:49:46 +02001735u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
David S. Millereb70db82016-07-01 16:07:50 -04001736{
1737 struct flow_keys keys;
1738
1739 __flow_hash_secret_init();
1740
1741 memset(&keys, 0, sizeof(keys));
Stanislav Fomichev3cbf4ff2019-04-22 08:55:46 -07001742 __skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
1743 &keys, NULL, 0, 0, 0,
David S. Millereb70db82016-07-01 16:07:50 -04001744 FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
1745
Eric Dumazet55667442019-10-22 07:57:46 -07001746 return __flow_hash_from_keys(&keys, &hashrnd);
David S. Millereb70db82016-07-01 16:07:50 -04001747}
1748EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
1749
Jiri Pirkod4fd3272015-05-12 14:56:10 +02001750/**
1751 * __skb_get_hash: calculate a flow hash
1752 * @skb: sk_buff to calculate flow hash from
1753 *
1754 * This function calculates a flow hash based on src/dst addresses
Tom Herbert61b905d2014-03-24 15:34:47 -07001755 * and src/dst port numbers. Sets hash in skb to non-zero hash value
1756 * on success, zero indicates no valid hash. Also, sets l4_hash in skb
Cong Wang441d9d32013-01-21 00:39:24 +00001757 * if hash is a canonical 4-tuple hash over transport ports.
1758 */
Tom Herbert3958afa1b2013-12-15 22:12:06 -08001759void __skb_get_hash(struct sk_buff *skb)
Cong Wang441d9d32013-01-21 00:39:24 +00001760{
1761 struct flow_keys keys;
Gao Feng635c2232016-08-31 14:15:05 +08001762 u32 hash;
Cong Wang441d9d32013-01-21 00:39:24 +00001763
Tom Herbert50fb7992015-05-01 11:30:12 -07001764 __flow_hash_secret_init();
1765
Eric Dumazet55667442019-10-22 07:57:46 -07001766 hash = ___skb_get_hash(skb, &keys, &hashrnd);
Gao Feng635c2232016-08-31 14:15:05 +08001767
1768 __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
Cong Wang441d9d32013-01-21 00:39:24 +00001769}
Tom Herbert3958afa1b2013-12-15 22:12:06 -08001770EXPORT_SYMBOL(__skb_get_hash);
Cong Wang441d9d32013-01-21 00:39:24 +00001771
Eric Dumazet55667442019-10-22 07:57:46 -07001772__u32 skb_get_hash_perturb(const struct sk_buff *skb,
1773 const siphash_key_t *perturb)
Tom Herbert50fb7992015-05-01 11:30:12 -07001774{
1775 struct flow_keys keys;
1776
1777 return ___skb_get_hash(skb, &keys, perturb);
1778}
1779EXPORT_SYMBOL(skb_get_hash_perturb);
1780
Alexander Lobakinf96533c2021-03-14 11:11:23 +00001781u32 __skb_get_poff(const struct sk_buff *skb, const void *data,
Paolo Abeni72a338b2018-05-04 11:32:59 +02001782 const struct flow_keys_basic *keys, int hlen)
Daniel Borkmannf77668d2013-03-19 06:39:30 +00001783{
Tom Herbert42aecaa2015-06-04 09:16:39 -07001784 u32 poff = keys->control.thoff;
Daniel Borkmannf77668d2013-03-19 06:39:30 +00001785
Alexander Duyck43d2ccb2016-02-24 09:29:44 -08001786 /* skip L4 headers for fragments after the first */
1787 if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
1788 !(keys->control.flags & FLOW_DIS_FIRST_FRAG))
1789 return poff;
1790
Jiri Pirko06635a32015-05-12 14:56:16 +02001791 switch (keys->basic.ip_proto) {
Daniel Borkmannf77668d2013-03-19 06:39:30 +00001792 case IPPROTO_TCP: {
Alexander Duyck5af7fb62014-10-10 12:09:12 -07001793 /* access doff as u8 to avoid unaligned access */
1794 const u8 *doff;
1795 u8 _doff;
Daniel Borkmannf77668d2013-03-19 06:39:30 +00001796
Alexander Duyck5af7fb62014-10-10 12:09:12 -07001797 doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
1798 data, hlen, &_doff);
1799 if (!doff)
Daniel Borkmannf77668d2013-03-19 06:39:30 +00001800 return poff;
1801
Alexander Duyck5af7fb62014-10-10 12:09:12 -07001802 poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
Daniel Borkmannf77668d2013-03-19 06:39:30 +00001803 break;
1804 }
1805 case IPPROTO_UDP:
1806 case IPPROTO_UDPLITE:
1807 poff += sizeof(struct udphdr);
1808 break;
1809 /* For the rest, we do not really care about header
1810 * extensions at this point for now.
1811 */
1812 case IPPROTO_ICMP:
1813 poff += sizeof(struct icmphdr);
1814 break;
1815 case IPPROTO_ICMPV6:
1816 poff += sizeof(struct icmp6hdr);
1817 break;
1818 case IPPROTO_IGMP:
1819 poff += sizeof(struct igmphdr);
1820 break;
1821 case IPPROTO_DCCP:
1822 poff += sizeof(struct dccp_hdr);
1823 break;
1824 case IPPROTO_SCTP:
1825 poff += sizeof(struct sctphdr);
1826 break;
1827 }
1828
1829 return poff;
1830}
1831
Jiri Pirko0db89b82015-05-12 14:56:14 +02001832/**
1833 * skb_get_poff - get the offset to the payload
1834 * @skb: sk_buff to get the payload offset from
1835 *
1836 * The function will get the offset to the payload as far as it could
1837 * be dissected. The main user is currently BPF, so that we can dynamically
Alexander Duyck56193d12014-09-05 19:20:26 -04001838 * truncate packets without needing to push actual payload to the user
1839 * space and can analyze headers only, instead.
1840 */
1841u32 skb_get_poff(const struct sk_buff *skb)
1842{
Paolo Abeni72a338b2018-05-04 11:32:59 +02001843 struct flow_keys_basic keys;
Alexander Duyck56193d12014-09-05 19:20:26 -04001844
Stanislav Fomichev3cbf4ff2019-04-22 08:55:46 -07001845 if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
1846 NULL, 0, 0, 0, 0))
Alexander Duyck56193d12014-09-05 19:20:26 -04001847 return 0;
1848
1849 return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
1850}
Jiri Pirko06635a32015-05-12 14:56:16 +02001851
David S. Miller20a17bf2015-09-01 21:19:17 -07001852__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
David S. Millera17ace92015-09-01 17:00:24 -07001853{
1854 memset(keys, 0, sizeof(*keys));
1855
1856 memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
1857 sizeof(keys->addrs.v6addrs.src));
1858 memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
1859 sizeof(keys->addrs.v6addrs.dst));
1860 keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1861 keys->ports.src = fl6->fl6_sport;
1862 keys->ports.dst = fl6->fl6_dport;
1863 keys->keyid.keyid = fl6->fl6_gre_key;
Michal Kubecekfa1be7e2018-06-04 11:36:05 +02001864 keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
David S. Millera17ace92015-09-01 17:00:24 -07001865 keys->basic.ip_proto = fl6->flowi6_proto;
1866
1867 return flow_hash_from_keys(keys);
1868}
1869EXPORT_SYMBOL(__get_hash_from_flowi6);
1870
Jiri Pirko06635a32015-05-12 14:56:16 +02001871static const struct flow_dissector_key flow_keys_dissector_keys[] = {
1872 {
Tom Herbert42aecaa2015-06-04 09:16:39 -07001873 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1874 .offset = offsetof(struct flow_keys, control),
1875 },
1876 {
Jiri Pirko06635a32015-05-12 14:56:16 +02001877 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1878 .offset = offsetof(struct flow_keys, basic),
1879 },
1880 {
1881 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
Tom Herbertc3f83242015-06-04 09:16:40 -07001882 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1883 },
1884 {
1885 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1886 .offset = offsetof(struct flow_keys, addrs.v6addrs),
Jiri Pirko06635a32015-05-12 14:56:16 +02001887 },
1888 {
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001889 .key_id = FLOW_DISSECTOR_KEY_TIPC,
1890 .offset = offsetof(struct flow_keys, addrs.tipckey),
Tom Herbert9f249082015-06-04 09:16:41 -07001891 },
1892 {
Jiri Pirko06635a32015-05-12 14:56:16 +02001893 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1894 .offset = offsetof(struct flow_keys, ports),
1895 },
Tom Herbertd34af822015-06-04 09:16:43 -07001896 {
Hadar Hen Zionf6a66922016-08-17 13:36:11 +03001897 .key_id = FLOW_DISSECTOR_KEY_VLAN,
1898 .offset = offsetof(struct flow_keys, vlan),
Tom Herbertd34af822015-06-04 09:16:43 -07001899 },
Tom Herbert87ee9e52015-06-04 09:16:44 -07001900 {
1901 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
1902 .offset = offsetof(struct flow_keys, tags),
1903 },
Tom Herbert1fdd5122015-06-04 09:16:45 -07001904 {
1905 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
1906 .offset = offsetof(struct flow_keys, keyid),
1907 },
Jiri Pirko06635a32015-05-12 14:56:16 +02001908};
1909
David S. Millereb70db82016-07-01 16:07:50 -04001910static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
1911 {
1912 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1913 .offset = offsetof(struct flow_keys, control),
1914 },
1915 {
1916 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1917 .offset = offsetof(struct flow_keys, basic),
1918 },
1919 {
1920 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
1921 .offset = offsetof(struct flow_keys, addrs.v4addrs),
1922 },
1923 {
1924 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
1925 .offset = offsetof(struct flow_keys, addrs.v6addrs),
1926 },
1927 {
1928 .key_id = FLOW_DISSECTOR_KEY_PORTS,
1929 .offset = offsetof(struct flow_keys, ports),
1930 },
1931};
1932
Paolo Abeni72a338b2018-05-04 11:32:59 +02001933static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
Jiri Pirko06635a32015-05-12 14:56:16 +02001934 {
Tom Herbert42aecaa2015-06-04 09:16:39 -07001935 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
1936 .offset = offsetof(struct flow_keys, control),
1937 },
1938 {
Jiri Pirko06635a32015-05-12 14:56:16 +02001939 .key_id = FLOW_DISSECTOR_KEY_BASIC,
1940 .offset = offsetof(struct flow_keys, basic),
1941 },
1942};
1943
1944struct flow_dissector flow_keys_dissector __read_mostly;
1945EXPORT_SYMBOL(flow_keys_dissector);
1946
Paolo Abeni72a338b2018-05-04 11:32:59 +02001947struct flow_dissector flow_keys_basic_dissector __read_mostly;
1948EXPORT_SYMBOL(flow_keys_basic_dissector);
Jiri Pirko06635a32015-05-12 14:56:16 +02001949
1950static int __init init_default_flow_dissectors(void)
1951{
1952 skb_flow_dissector_init(&flow_keys_dissector,
1953 flow_keys_dissector_keys,
1954 ARRAY_SIZE(flow_keys_dissector_keys));
David S. Millereb70db82016-07-01 16:07:50 -04001955 skb_flow_dissector_init(&flow_keys_dissector_symmetric,
1956 flow_keys_dissector_symmetric_keys,
1957 ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
Paolo Abeni72a338b2018-05-04 11:32:59 +02001958 skb_flow_dissector_init(&flow_keys_basic_dissector,
1959 flow_keys_basic_dissector_keys,
1960 ARRAY_SIZE(flow_keys_basic_dissector_keys));
Jakub Sitnickib27f7bb2020-05-31 10:28:37 +02001961 return 0;
Jakub Sitnicki5cf65922020-05-21 10:34:35 +02001962}
Eric Dumazetc9b8af12016-11-22 11:17:30 -08001963core_initcall(init_default_flow_dissectors);