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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fbff949e | 2 | #include <linux/kernel.h> |
0744dd00 | 3 | #include <linux/skbuff.h> |
c452ed70 | 4 | #include <linux/export.h> |
0744dd00 ED |
5 | #include <linux/ip.h> |
6 | #include <linux/ipv6.h> | |
7 | #include <linux/if_vlan.h> | |
b6459415 | 8 | #include <linux/filter.h> |
43e66528 | 9 | #include <net/dsa.h> |
a38402bc | 10 | #include <net/dst_metadata.h> |
0744dd00 | 11 | #include <net/ip.h> |
ddbe5032 | 12 | #include <net/ipv6.h> |
ab10dccb GF |
13 | #include <net/gre.h> |
14 | #include <net/pptp.h> | |
8d6e79d3 | 15 | #include <net/tipc.h> |
f77668dc DB |
16 | #include <linux/igmp.h> |
17 | #include <linux/icmp.h> | |
18 | #include <linux/sctp.h> | |
19 | #include <linux/dccp.h> | |
0744dd00 ED |
20 | #include <linux/if_tunnel.h> |
21 | #include <linux/if_pppox.h> | |
22 | #include <linux/ppp_defs.h> | |
06635a35 | 23 | #include <linux/stddef.h> |
67a900cc | 24 | #include <linux/if_ether.h> |
bf08824a | 25 | #include <linux/if_hsr.h> |
b3baa0fb | 26 | #include <linux/mpls.h> |
ac4bb5de | 27 | #include <linux/tcp.h> |
4f1cc51f | 28 | #include <linux/ptp_classify.h> |
1bd758eb | 29 | #include <net/flow_dissector.h> |
d5ccfd90 | 30 | #include <net/pkt_cls.h> |
56193d1b | 31 | #include <scsi/fc/fc_fcoe.h> |
5b0890a9 | 32 | #include <uapi/linux/batadv_packet.h> |
d58e468b | 33 | #include <linux/bpf.h> |
75a56758 PB |
34 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
35 | #include <net/netfilter/nf_conntrack_core.h> | |
36 | #include <net/netfilter/nf_conntrack_labels.h> | |
37 | #endif | |
a3fd7cee | 38 | #include <linux/bpf-netns.h> |
d58e468b | 39 | |
20a17bf6 DM |
40 | static void dissector_set_key(struct flow_dissector *flow_dissector, |
41 | enum flow_dissector_key_id key_id) | |
fbff949e | 42 | { |
2b3082c6 | 43 | flow_dissector->used_keys |= (1ULL << key_id); |
fbff949e JP |
44 | } |
45 | ||
fbff949e JP |
46 | void skb_flow_dissector_init(struct flow_dissector *flow_dissector, |
47 | const struct flow_dissector_key *key, | |
48 | unsigned int key_count) | |
49 | { | |
50 | unsigned int i; | |
51 | ||
52 | memset(flow_dissector, 0, sizeof(*flow_dissector)); | |
53 | ||
54 | for (i = 0; i < key_count; i++, key++) { | |
75a5fb0c | 55 | /* User should make sure that every key target offset is within |
fbff949e JP |
56 | * boundaries of unsigned short. |
57 | */ | |
58 | BUG_ON(key->offset > USHRT_MAX); | |
20a17bf6 DM |
59 | BUG_ON(dissector_uses_key(flow_dissector, |
60 | key->key_id)); | |
fbff949e | 61 | |
20a17bf6 | 62 | dissector_set_key(flow_dissector, key->key_id); |
fbff949e JP |
63 | flow_dissector->offset[key->key_id] = key->offset; |
64 | } | |
65 | ||
42aecaa9 TH |
66 | /* Ensure that the dissector always includes control and basic key. |
67 | * That way we are able to avoid handling lack of these in fast path. | |
fbff949e | 68 | */ |
20a17bf6 DM |
69 | BUG_ON(!dissector_uses_key(flow_dissector, |
70 | FLOW_DISSECTOR_KEY_CONTROL)); | |
71 | BUG_ON(!dissector_uses_key(flow_dissector, | |
72 | FLOW_DISSECTOR_KEY_BASIC)); | |
fbff949e JP |
73 | } |
74 | EXPORT_SYMBOL(skb_flow_dissector_init); | |
75 | ||
b27f7bb5 | 76 | #ifdef CONFIG_BPF_SYSCALL |
3b701699 JS |
77 | int flow_dissector_bpf_prog_attach_check(struct net *net, |
78 | struct bpf_prog *prog) | |
d58e468b | 79 | { |
a3fd7cee | 80 | enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR; |
a11c397c SF |
81 | |
82 | if (net == &init_net) { | |
83 | /* BPF flow dissector in the root namespace overrides | |
84 | * any per-net-namespace one. When attaching to root, | |
85 | * make sure we don't have any BPF program attached | |
86 | * to the non-root namespaces. | |
87 | */ | |
88 | struct net *ns; | |
89 | ||
90 | for_each_net(ns) { | |
719b78a5 JS |
91 | if (ns == &init_net) |
92 | continue; | |
695c1214 | 93 | if (rcu_access_pointer(ns->bpf.run_array[type])) |
171526f6 | 94 | return -EEXIST; |
a11c397c SF |
95 | } |
96 | } else { | |
97 | /* Make sure root flow dissector is not attached | |
98 | * when attaching to the non-root namespace. | |
99 | */ | |
695c1214 | 100 | if (rcu_access_pointer(init_net.bpf.run_array[type])) |
171526f6 | 101 | return -EEXIST; |
a11c397c SF |
102 | } |
103 | ||
171526f6 JS |
104 | return 0; |
105 | } | |
b27f7bb5 | 106 | #endif /* CONFIG_BPF_SYSCALL */ |
5cf65922 | 107 | |
357afe9c | 108 | /** |
6451b3f5 WC |
109 | * __skb_flow_get_ports - extract the upper layer ports and return them |
110 | * @skb: sk_buff to extract the ports from | |
357afe9c NA |
111 | * @thoff: transport header offset |
112 | * @ip_proto: protocol for which to get port offset | |
6451b3f5 WC |
113 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
114 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
357afe9c NA |
115 | * |
116 | * The function will try to retrieve the ports at offset thoff + poff where poff | |
117 | * is the protocol port offset returned from proto_ports_offset | |
118 | */ | |
690e36e7 | 119 | __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, |
f96533cd | 120 | const void *data, int hlen) |
357afe9c NA |
121 | { |
122 | int poff = proto_ports_offset(ip_proto); | |
123 | ||
690e36e7 DM |
124 | if (!data) { |
125 | data = skb->data; | |
126 | hlen = skb_headlen(skb); | |
127 | } | |
128 | ||
357afe9c NA |
129 | if (poff >= 0) { |
130 | __be32 *ports, _ports; | |
131 | ||
690e36e7 DM |
132 | ports = __skb_header_pointer(skb, thoff + poff, |
133 | sizeof(_ports), data, hlen, &_ports); | |
357afe9c NA |
134 | if (ports) |
135 | return *ports; | |
136 | } | |
137 | ||
138 | return 0; | |
139 | } | |
690e36e7 | 140 | EXPORT_SYMBOL(__skb_flow_get_ports); |
357afe9c | 141 | |
5dec597e MC |
142 | static bool icmp_has_id(u8 type) |
143 | { | |
144 | switch (type) { | |
145 | case ICMP_ECHO: | |
146 | case ICMP_ECHOREPLY: | |
147 | case ICMP_TIMESTAMP: | |
148 | case ICMP_TIMESTAMPREPLY: | |
149 | case ICMPV6_ECHO_REQUEST: | |
150 | case ICMPV6_ECHO_REPLY: | |
151 | return true; | |
152 | } | |
153 | ||
154 | return false; | |
155 | } | |
156 | ||
157 | /** | |
158 | * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields | |
159 | * @skb: sk_buff to extract from | |
160 | * @key_icmp: struct flow_dissector_key_icmp to fill | |
161 | * @data: raw buffer pointer to the packet | |
6b3acfc3 | 162 | * @thoff: offset to extract at |
5dec597e MC |
163 | * @hlen: packet header length |
164 | */ | |
165 | void skb_flow_get_icmp_tci(const struct sk_buff *skb, | |
166 | struct flow_dissector_key_icmp *key_icmp, | |
f96533cd | 167 | const void *data, int thoff, int hlen) |
5dec597e MC |
168 | { |
169 | struct icmphdr *ih, _ih; | |
170 | ||
171 | ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih); | |
172 | if (!ih) | |
173 | return; | |
174 | ||
175 | key_icmp->type = ih->type; | |
176 | key_icmp->code = ih->code; | |
177 | ||
178 | /* As we use 0 to signal that the Id field is not present, | |
179 | * avoid confusion with packets without such field | |
180 | */ | |
181 | if (icmp_has_id(ih->type)) | |
a25f8222 | 182 | key_icmp->id = ih->un.echo.id ? ntohs(ih->un.echo.id) : 1; |
5dec597e MC |
183 | else |
184 | key_icmp->id = 0; | |
185 | } | |
186 | EXPORT_SYMBOL(skb_flow_get_icmp_tci); | |
187 | ||
188 | /* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet | |
189 | * using skb_flow_get_icmp_tci(). | |
3b336d6f MC |
190 | */ |
191 | static void __skb_flow_dissect_icmp(const struct sk_buff *skb, | |
192 | struct flow_dissector *flow_dissector, | |
f96533cd AL |
193 | void *target_container, const void *data, |
194 | int thoff, int hlen) | |
3b336d6f MC |
195 | { |
196 | struct flow_dissector_key_icmp *key_icmp; | |
197 | ||
198 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP)) | |
199 | return; | |
200 | ||
201 | key_icmp = skb_flow_dissector_target(flow_dissector, | |
202 | FLOW_DISSECTOR_KEY_ICMP, | |
203 | target_container); | |
5dec597e MC |
204 | |
205 | skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen); | |
3b336d6f MC |
206 | } |
207 | ||
a57c34a8 RK |
208 | static void __skb_flow_dissect_ah(const struct sk_buff *skb, |
209 | struct flow_dissector *flow_dissector, | |
210 | void *target_container, const void *data, | |
211 | int nhoff, int hlen) | |
212 | { | |
213 | struct flow_dissector_key_ipsec *key_ah; | |
214 | struct ip_auth_hdr _hdr, *hdr; | |
215 | ||
216 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPSEC)) | |
217 | return; | |
218 | ||
219 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); | |
220 | if (!hdr) | |
221 | return; | |
222 | ||
223 | key_ah = skb_flow_dissector_target(flow_dissector, | |
224 | FLOW_DISSECTOR_KEY_IPSEC, | |
225 | target_container); | |
226 | ||
227 | key_ah->spi = hdr->spi; | |
228 | } | |
229 | ||
230 | static void __skb_flow_dissect_esp(const struct sk_buff *skb, | |
231 | struct flow_dissector *flow_dissector, | |
232 | void *target_container, const void *data, | |
233 | int nhoff, int hlen) | |
234 | { | |
235 | struct flow_dissector_key_ipsec *key_esp; | |
236 | struct ip_esp_hdr _hdr, *hdr; | |
237 | ||
238 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPSEC)) | |
239 | return; | |
240 | ||
241 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); | |
242 | if (!hdr) | |
243 | return; | |
244 | ||
245 | key_esp = skb_flow_dissector_target(flow_dissector, | |
246 | FLOW_DISSECTOR_KEY_IPSEC, | |
247 | target_container); | |
248 | ||
249 | key_esp->spi = hdr->spi; | |
250 | } | |
251 | ||
dda2fa08 WD |
252 | static void __skb_flow_dissect_l2tpv3(const struct sk_buff *skb, |
253 | struct flow_dissector *flow_dissector, | |
254 | void *target_container, const void *data, | |
255 | int nhoff, int hlen) | |
256 | { | |
257 | struct flow_dissector_key_l2tpv3 *key_l2tpv3; | |
258 | struct { | |
259 | __be32 session_id; | |
260 | } *hdr, _hdr; | |
261 | ||
262 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_L2TPV3)) | |
263 | return; | |
264 | ||
265 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); | |
266 | if (!hdr) | |
267 | return; | |
268 | ||
269 | key_l2tpv3 = skb_flow_dissector_target(flow_dissector, | |
270 | FLOW_DISSECTOR_KEY_L2TPV3, | |
271 | target_container); | |
272 | ||
273 | key_l2tpv3->session_id = hdr->session_id; | |
274 | } | |
275 | ||
82828b88 JP |
276 | void skb_flow_dissect_meta(const struct sk_buff *skb, |
277 | struct flow_dissector *flow_dissector, | |
278 | void *target_container) | |
279 | { | |
280 | struct flow_dissector_key_meta *meta; | |
281 | ||
282 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META)) | |
283 | return; | |
284 | ||
285 | meta = skb_flow_dissector_target(flow_dissector, | |
286 | FLOW_DISSECTOR_KEY_META, | |
287 | target_container); | |
288 | meta->ingress_ifindex = skb->skb_iif; | |
d5ccfd90 IS |
289 | #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT) |
290 | if (tc_skb_ext_tc_enabled()) { | |
291 | struct tc_skb_ext *ext; | |
292 | ||
293 | ext = skb_ext_find(skb, TC_SKB_EXT); | |
294 | if (ext) | |
295 | meta->l2_miss = ext->l2_miss; | |
296 | } | |
297 | #endif | |
82828b88 JP |
298 | } |
299 | EXPORT_SYMBOL(skb_flow_dissect_meta); | |
300 | ||
a38402bc | 301 | static void |
4d0aed38 AST |
302 | skb_flow_dissect_set_enc_control(enum flow_dissector_key_id type, |
303 | u32 ctrl_flags, | |
304 | struct flow_dissector *flow_dissector, | |
305 | void *target_container) | |
a38402bc SH |
306 | { |
307 | struct flow_dissector_key_control *ctrl; | |
308 | ||
309 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL)) | |
310 | return; | |
311 | ||
312 | ctrl = skb_flow_dissector_target(flow_dissector, | |
313 | FLOW_DISSECTOR_KEY_ENC_CONTROL, | |
314 | target_container); | |
315 | ctrl->addr_type = type; | |
4d0aed38 | 316 | ctrl->flags = ctrl_flags; |
a38402bc SH |
317 | } |
318 | ||
75a56758 PB |
319 | void |
320 | skb_flow_dissect_ct(const struct sk_buff *skb, | |
321 | struct flow_dissector *flow_dissector, | |
7baf2429 | 322 | void *target_container, u16 *ctinfo_map, |
38495958 | 323 | size_t mapsize, bool post_ct, u16 zone) |
75a56758 PB |
324 | { |
325 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) | |
326 | struct flow_dissector_key_ct *key; | |
327 | enum ip_conntrack_info ctinfo; | |
328 | struct nf_conn_labels *cl; | |
329 | struct nf_conn *ct; | |
330 | ||
331 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT)) | |
332 | return; | |
333 | ||
334 | ct = nf_ct_get(skb, &ctinfo); | |
7baf2429 | 335 | if (!ct && !post_ct) |
75a56758 PB |
336 | return; |
337 | ||
338 | key = skb_flow_dissector_target(flow_dissector, | |
339 | FLOW_DISSECTOR_KEY_CT, | |
340 | target_container); | |
341 | ||
7baf2429 | 342 | if (!ct) { |
343 | key->ct_state = TCA_FLOWER_KEY_CT_FLAGS_TRACKED | | |
344 | TCA_FLOWER_KEY_CT_FLAGS_INVALID; | |
38495958 | 345 | key->ct_zone = zone; |
7baf2429 | 346 | return; |
347 | } | |
348 | ||
75a56758 PB |
349 | if (ctinfo < mapsize) |
350 | key->ct_state = ctinfo_map[ctinfo]; | |
351 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) | |
352 | key->ct_zone = ct->zone.id; | |
353 | #endif | |
354 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) | |
52d1aa8b | 355 | key->ct_mark = READ_ONCE(ct->mark); |
75a56758 PB |
356 | #endif |
357 | ||
358 | cl = nf_ct_labels_find(ct); | |
359 | if (cl) | |
360 | memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels)); | |
361 | #endif /* CONFIG_NF_CONNTRACK */ | |
362 | } | |
363 | EXPORT_SYMBOL(skb_flow_dissect_ct); | |
364 | ||
62b32379 SH |
365 | void |
366 | skb_flow_dissect_tunnel_info(const struct sk_buff *skb, | |
367 | struct flow_dissector *flow_dissector, | |
368 | void *target_container) | |
a38402bc SH |
369 | { |
370 | struct ip_tunnel_info *info; | |
371 | struct ip_tunnel_key *key; | |
4d0aed38 | 372 | u32 ctrl_flags = 0; |
a38402bc SH |
373 | |
374 | /* A quick check to see if there might be something to do. */ | |
375 | if (!dissector_uses_key(flow_dissector, | |
376 | FLOW_DISSECTOR_KEY_ENC_KEYID) && | |
377 | !dissector_uses_key(flow_dissector, | |
378 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) && | |
379 | !dissector_uses_key(flow_dissector, | |
380 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) && | |
381 | !dissector_uses_key(flow_dissector, | |
382 | FLOW_DISSECTOR_KEY_ENC_CONTROL) && | |
383 | !dissector_uses_key(flow_dissector, | |
5544adb9 OG |
384 | FLOW_DISSECTOR_KEY_ENC_PORTS) && |
385 | !dissector_uses_key(flow_dissector, | |
92e2c405 SH |
386 | FLOW_DISSECTOR_KEY_ENC_IP) && |
387 | !dissector_uses_key(flow_dissector, | |
db5271d5 | 388 | FLOW_DISSECTOR_KEY_ENC_OPTS)) |
a38402bc SH |
389 | return; |
390 | ||
391 | info = skb_tunnel_info(skb); | |
392 | if (!info) | |
393 | return; | |
394 | ||
395 | key = &info->key; | |
396 | ||
03afeb61 AST |
397 | if (test_bit(IP_TUNNEL_CSUM_BIT, key->tun_flags)) |
398 | ctrl_flags |= FLOW_DIS_F_TUNNEL_CSUM; | |
399 | if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags)) | |
400 | ctrl_flags |= FLOW_DIS_F_TUNNEL_DONT_FRAGMENT; | |
401 | if (test_bit(IP_TUNNEL_OAM_BIT, key->tun_flags)) | |
402 | ctrl_flags |= FLOW_DIS_F_TUNNEL_OAM; | |
403 | if (test_bit(IP_TUNNEL_CRIT_OPT_BIT, key->tun_flags)) | |
404 | ctrl_flags |= FLOW_DIS_F_TUNNEL_CRIT_OPT; | |
405 | ||
a38402bc SH |
406 | switch (ip_tunnel_info_af(info)) { |
407 | case AF_INET: | |
4d0aed38 AST |
408 | skb_flow_dissect_set_enc_control(FLOW_DISSECTOR_KEY_IPV4_ADDRS, |
409 | ctrl_flags, flow_dissector, | |
410 | target_container); | |
a38402bc SH |
411 | if (dissector_uses_key(flow_dissector, |
412 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) { | |
413 | struct flow_dissector_key_ipv4_addrs *ipv4; | |
414 | ||
415 | ipv4 = skb_flow_dissector_target(flow_dissector, | |
416 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, | |
417 | target_container); | |
418 | ipv4->src = key->u.ipv4.src; | |
419 | ipv4->dst = key->u.ipv4.dst; | |
420 | } | |
421 | break; | |
422 | case AF_INET6: | |
4d0aed38 AST |
423 | skb_flow_dissect_set_enc_control(FLOW_DISSECTOR_KEY_IPV6_ADDRS, |
424 | ctrl_flags, flow_dissector, | |
425 | target_container); | |
a38402bc SH |
426 | if (dissector_uses_key(flow_dissector, |
427 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) { | |
428 | struct flow_dissector_key_ipv6_addrs *ipv6; | |
429 | ||
430 | ipv6 = skb_flow_dissector_target(flow_dissector, | |
431 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, | |
432 | target_container); | |
433 | ipv6->src = key->u.ipv6.src; | |
434 | ipv6->dst = key->u.ipv6.dst; | |
435 | } | |
436 | break; | |
706bf4f4 AST |
437 | default: |
438 | skb_flow_dissect_set_enc_control(0, ctrl_flags, flow_dissector, | |
439 | target_container); | |
440 | break; | |
a38402bc SH |
441 | } |
442 | ||
443 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) { | |
444 | struct flow_dissector_key_keyid *keyid; | |
445 | ||
446 | keyid = skb_flow_dissector_target(flow_dissector, | |
447 | FLOW_DISSECTOR_KEY_ENC_KEYID, | |
448 | target_container); | |
449 | keyid->keyid = tunnel_id_to_key32(key->tun_id); | |
450 | } | |
451 | ||
452 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) { | |
453 | struct flow_dissector_key_ports *tp; | |
454 | ||
455 | tp = skb_flow_dissector_target(flow_dissector, | |
456 | FLOW_DISSECTOR_KEY_ENC_PORTS, | |
457 | target_container); | |
458 | tp->src = key->tp_src; | |
459 | tp->dst = key->tp_dst; | |
460 | } | |
5544adb9 OG |
461 | |
462 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) { | |
463 | struct flow_dissector_key_ip *ip; | |
464 | ||
465 | ip = skb_flow_dissector_target(flow_dissector, | |
466 | FLOW_DISSECTOR_KEY_ENC_IP, | |
467 | target_container); | |
468 | ip->tos = key->tos; | |
469 | ip->ttl = key->ttl; | |
470 | } | |
92e2c405 SH |
471 | |
472 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) { | |
473 | struct flow_dissector_key_enc_opts *enc_opt; | |
5832c4a7 AL |
474 | IP_TUNNEL_DECLARE_FLAGS(flags) = { }; |
475 | u32 val; | |
92e2c405 SH |
476 | |
477 | enc_opt = skb_flow_dissector_target(flow_dissector, | |
478 | FLOW_DISSECTOR_KEY_ENC_OPTS, | |
479 | target_container); | |
480 | ||
5832c4a7 AL |
481 | if (!info->options_len) |
482 | return; | |
483 | ||
484 | enc_opt->len = info->options_len; | |
485 | ip_tunnel_info_opts_get(enc_opt->data, info); | |
486 | ||
487 | ip_tunnel_set_options_present(flags); | |
488 | ip_tunnel_flags_and(flags, info->key.tun_flags, flags); | |
489 | ||
490 | val = find_next_bit(flags, __IP_TUNNEL_FLAG_NUM, | |
491 | IP_TUNNEL_GENEVE_OPT_BIT); | |
492 | enc_opt->dst_opt_type = val < __IP_TUNNEL_FLAG_NUM ? val : 0; | |
92e2c405 | 493 | } |
a38402bc | 494 | } |
62b32379 | 495 | EXPORT_SYMBOL(skb_flow_dissect_tunnel_info); |
a38402bc | 496 | |
0cb09aff AL |
497 | void skb_flow_dissect_hash(const struct sk_buff *skb, |
498 | struct flow_dissector *flow_dissector, | |
499 | void *target_container) | |
500 | { | |
501 | struct flow_dissector_key_hash *key; | |
502 | ||
503 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_HASH)) | |
504 | return; | |
505 | ||
506 | key = skb_flow_dissector_target(flow_dissector, | |
507 | FLOW_DISSECTOR_KEY_HASH, | |
508 | target_container); | |
509 | ||
510 | key->hash = skb_get_hash_raw(skb); | |
511 | } | |
512 | EXPORT_SYMBOL(skb_flow_dissect_hash); | |
513 | ||
4a5d6c8b JP |
514 | static enum flow_dissect_ret |
515 | __skb_flow_dissect_mpls(const struct sk_buff *skb, | |
516 | struct flow_dissector *flow_dissector, | |
f96533cd AL |
517 | void *target_container, const void *data, int nhoff, |
518 | int hlen, int lse_index, bool *entropy_label) | |
4a5d6c8b | 519 | { |
58cff782 GN |
520 | struct mpls_label *hdr, _hdr; |
521 | u32 entry, label, bos; | |
4a5d6c8b JP |
522 | |
523 | if (!dissector_uses_key(flow_dissector, | |
029c1ecb BL |
524 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY) && |
525 | !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) | |
4a5d6c8b JP |
526 | return FLOW_DISSECT_RET_OUT_GOOD; |
527 | ||
58cff782 GN |
528 | if (lse_index >= FLOW_DIS_MPLS_MAX) |
529 | return FLOW_DISSECT_RET_OUT_GOOD; | |
530 | ||
4a5d6c8b JP |
531 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, |
532 | hlen, &_hdr); | |
533 | if (!hdr) | |
534 | return FLOW_DISSECT_RET_OUT_BAD; | |
535 | ||
58cff782 | 536 | entry = ntohl(hdr->entry); |
029c1ecb | 537 | label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT; |
58cff782 | 538 | bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT; |
029c1ecb BL |
539 | |
540 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) { | |
541 | struct flow_dissector_key_mpls *key_mpls; | |
58cff782 | 542 | struct flow_dissector_mpls_lse *lse; |
029c1ecb BL |
543 | |
544 | key_mpls = skb_flow_dissector_target(flow_dissector, | |
545 | FLOW_DISSECTOR_KEY_MPLS, | |
546 | target_container); | |
58cff782 GN |
547 | lse = &key_mpls->ls[lse_index]; |
548 | ||
549 | lse->mpls_ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT; | |
550 | lse->mpls_bos = bos; | |
551 | lse->mpls_tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT; | |
552 | lse->mpls_label = label; | |
553 | dissector_set_mpls_lse(key_mpls, lse_index); | |
029c1ecb BL |
554 | } |
555 | ||
58cff782 GN |
556 | if (*entropy_label && |
557 | dissector_uses_key(flow_dissector, | |
558 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) { | |
559 | struct flow_dissector_key_keyid *key_keyid; | |
560 | ||
4a5d6c8b JP |
561 | key_keyid = skb_flow_dissector_target(flow_dissector, |
562 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY, | |
563 | target_container); | |
58cff782 | 564 | key_keyid->keyid = cpu_to_be32(label); |
4a5d6c8b | 565 | } |
58cff782 GN |
566 | |
567 | *entropy_label = label == MPLS_LABEL_ENTROPY; | |
568 | ||
569 | return bos ? FLOW_DISSECT_RET_OUT_GOOD : FLOW_DISSECT_RET_PROTO_AGAIN; | |
4a5d6c8b JP |
570 | } |
571 | ||
9bf881ff JP |
572 | static enum flow_dissect_ret |
573 | __skb_flow_dissect_arp(const struct sk_buff *skb, | |
574 | struct flow_dissector *flow_dissector, | |
f96533cd AL |
575 | void *target_container, const void *data, |
576 | int nhoff, int hlen) | |
9bf881ff JP |
577 | { |
578 | struct flow_dissector_key_arp *key_arp; | |
579 | struct { | |
580 | unsigned char ar_sha[ETH_ALEN]; | |
581 | unsigned char ar_sip[4]; | |
582 | unsigned char ar_tha[ETH_ALEN]; | |
583 | unsigned char ar_tip[4]; | |
584 | } *arp_eth, _arp_eth; | |
585 | const struct arphdr *arp; | |
6f14f443 | 586 | struct arphdr _arp; |
9bf881ff JP |
587 | |
588 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP)) | |
589 | return FLOW_DISSECT_RET_OUT_GOOD; | |
590 | ||
591 | arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data, | |
592 | hlen, &_arp); | |
593 | if (!arp) | |
594 | return FLOW_DISSECT_RET_OUT_BAD; | |
595 | ||
596 | if (arp->ar_hrd != htons(ARPHRD_ETHER) || | |
597 | arp->ar_pro != htons(ETH_P_IP) || | |
598 | arp->ar_hln != ETH_ALEN || | |
599 | arp->ar_pln != 4 || | |
600 | (arp->ar_op != htons(ARPOP_REPLY) && | |
601 | arp->ar_op != htons(ARPOP_REQUEST))) | |
602 | return FLOW_DISSECT_RET_OUT_BAD; | |
603 | ||
604 | arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp), | |
605 | sizeof(_arp_eth), data, | |
606 | hlen, &_arp_eth); | |
607 | if (!arp_eth) | |
608 | return FLOW_DISSECT_RET_OUT_BAD; | |
609 | ||
610 | key_arp = skb_flow_dissector_target(flow_dissector, | |
611 | FLOW_DISSECTOR_KEY_ARP, | |
612 | target_container); | |
613 | ||
614 | memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip)); | |
615 | memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip)); | |
616 | ||
617 | /* Only store the lower byte of the opcode; | |
618 | * this covers ARPOP_REPLY and ARPOP_REQUEST. | |
619 | */ | |
620 | key_arp->op = ntohs(arp->ar_op) & 0xff; | |
621 | ||
622 | ether_addr_copy(key_arp->sha, arp_eth->ar_sha); | |
623 | ether_addr_copy(key_arp->tha, arp_eth->ar_tha); | |
624 | ||
625 | return FLOW_DISSECT_RET_OUT_GOOD; | |
626 | } | |
627 | ||
d7ad70b5 ZD |
628 | static enum flow_dissect_ret |
629 | __skb_flow_dissect_cfm(const struct sk_buff *skb, | |
630 | struct flow_dissector *flow_dissector, | |
631 | void *target_container, const void *data, | |
632 | int nhoff, int hlen) | |
633 | { | |
634 | struct flow_dissector_key_cfm *key, *hdr, _hdr; | |
635 | ||
636 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CFM)) | |
637 | return FLOW_DISSECT_RET_OUT_GOOD; | |
638 | ||
639 | hdr = __skb_header_pointer(skb, nhoff, sizeof(*key), data, hlen, &_hdr); | |
640 | if (!hdr) | |
641 | return FLOW_DISSECT_RET_OUT_BAD; | |
642 | ||
643 | key = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_CFM, | |
644 | target_container); | |
645 | ||
646 | key->mdl_ver = hdr->mdl_ver; | |
647 | key->opcode = hdr->opcode; | |
648 | ||
649 | return FLOW_DISSECT_RET_OUT_GOOD; | |
650 | } | |
651 | ||
7c92de8e JP |
652 | static enum flow_dissect_ret |
653 | __skb_flow_dissect_gre(const struct sk_buff *skb, | |
654 | struct flow_dissector_key_control *key_control, | |
655 | struct flow_dissector *flow_dissector, | |
f96533cd | 656 | void *target_container, const void *data, |
7c92de8e JP |
657 | __be16 *p_proto, int *p_nhoff, int *p_hlen, |
658 | unsigned int flags) | |
659 | { | |
660 | struct flow_dissector_key_keyid *key_keyid; | |
661 | struct gre_base_hdr *hdr, _hdr; | |
662 | int offset = 0; | |
663 | u16 gre_ver; | |
664 | ||
665 | hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), | |
666 | data, *p_hlen, &_hdr); | |
667 | if (!hdr) | |
668 | return FLOW_DISSECT_RET_OUT_BAD; | |
669 | ||
670 | /* Only look inside GRE without routing */ | |
671 | if (hdr->flags & GRE_ROUTING) | |
672 | return FLOW_DISSECT_RET_OUT_GOOD; | |
673 | ||
674 | /* Only look inside GRE for version 0 and 1 */ | |
675 | gre_ver = ntohs(hdr->flags & GRE_VERSION); | |
676 | if (gre_ver > 1) | |
677 | return FLOW_DISSECT_RET_OUT_GOOD; | |
678 | ||
679 | *p_proto = hdr->protocol; | |
680 | if (gre_ver) { | |
681 | /* Version1 must be PPTP, and check the flags */ | |
682 | if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY))) | |
683 | return FLOW_DISSECT_RET_OUT_GOOD; | |
684 | } | |
685 | ||
686 | offset += sizeof(struct gre_base_hdr); | |
687 | ||
688 | if (hdr->flags & GRE_CSUM) | |
c593642c PB |
689 | offset += sizeof_field(struct gre_full_hdr, csum) + |
690 | sizeof_field(struct gre_full_hdr, reserved1); | |
7c92de8e JP |
691 | |
692 | if (hdr->flags & GRE_KEY) { | |
693 | const __be32 *keyid; | |
694 | __be32 _keyid; | |
695 | ||
696 | keyid = __skb_header_pointer(skb, *p_nhoff + offset, | |
697 | sizeof(_keyid), | |
698 | data, *p_hlen, &_keyid); | |
699 | if (!keyid) | |
700 | return FLOW_DISSECT_RET_OUT_BAD; | |
701 | ||
702 | if (dissector_uses_key(flow_dissector, | |
703 | FLOW_DISSECTOR_KEY_GRE_KEYID)) { | |
704 | key_keyid = skb_flow_dissector_target(flow_dissector, | |
705 | FLOW_DISSECTOR_KEY_GRE_KEYID, | |
706 | target_container); | |
707 | if (gre_ver == 0) | |
708 | key_keyid->keyid = *keyid; | |
709 | else | |
710 | key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK; | |
711 | } | |
c593642c | 712 | offset += sizeof_field(struct gre_full_hdr, key); |
7c92de8e JP |
713 | } |
714 | ||
715 | if (hdr->flags & GRE_SEQ) | |
c593642c | 716 | offset += sizeof_field(struct pptp_gre_header, seq); |
7c92de8e JP |
717 | |
718 | if (gre_ver == 0) { | |
719 | if (*p_proto == htons(ETH_P_TEB)) { | |
720 | const struct ethhdr *eth; | |
721 | struct ethhdr _eth; | |
722 | ||
723 | eth = __skb_header_pointer(skb, *p_nhoff + offset, | |
724 | sizeof(_eth), | |
725 | data, *p_hlen, &_eth); | |
726 | if (!eth) | |
727 | return FLOW_DISSECT_RET_OUT_BAD; | |
728 | *p_proto = eth->h_proto; | |
729 | offset += sizeof(*eth); | |
730 | ||
731 | /* Cap headers that we access via pointers at the | |
732 | * end of the Ethernet header as our maximum alignment | |
733 | * at that point is only 2 bytes. | |
734 | */ | |
735 | if (NET_IP_ALIGN) | |
736 | *p_hlen = *p_nhoff + offset; | |
737 | } | |
738 | } else { /* version 1, must be PPTP */ | |
739 | u8 _ppp_hdr[PPP_HDRLEN]; | |
740 | u8 *ppp_hdr; | |
741 | ||
742 | if (hdr->flags & GRE_ACK) | |
c593642c | 743 | offset += sizeof_field(struct pptp_gre_header, ack); |
7c92de8e JP |
744 | |
745 | ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset, | |
746 | sizeof(_ppp_hdr), | |
747 | data, *p_hlen, _ppp_hdr); | |
748 | if (!ppp_hdr) | |
749 | return FLOW_DISSECT_RET_OUT_BAD; | |
750 | ||
751 | switch (PPP_PROTOCOL(ppp_hdr)) { | |
752 | case PPP_IP: | |
753 | *p_proto = htons(ETH_P_IP); | |
754 | break; | |
755 | case PPP_IPV6: | |
756 | *p_proto = htons(ETH_P_IPV6); | |
757 | break; | |
758 | default: | |
759 | /* Could probably catch some more like MPLS */ | |
760 | break; | |
761 | } | |
762 | ||
763 | offset += PPP_HDRLEN; | |
764 | } | |
765 | ||
766 | *p_nhoff += offset; | |
767 | key_control->flags |= FLOW_DIS_ENCAPSULATION; | |
768 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) | |
769 | return FLOW_DISSECT_RET_OUT_GOOD; | |
770 | ||
3a1214e8 | 771 | return FLOW_DISSECT_RET_PROTO_AGAIN; |
7c92de8e JP |
772 | } |
773 | ||
5b0890a9 SE |
774 | /** |
775 | * __skb_flow_dissect_batadv() - dissect batman-adv header | |
776 | * @skb: sk_buff to with the batman-adv header | |
777 | * @key_control: flow dissectors control key | |
778 | * @data: raw buffer pointer to the packet, if NULL use skb->data | |
779 | * @p_proto: pointer used to update the protocol to process next | |
780 | * @p_nhoff: pointer used to update inner network header offset | |
781 | * @hlen: packet header length | |
782 | * @flags: any combination of FLOW_DISSECTOR_F_* | |
783 | * | |
784 | * ETH_P_BATMAN packets are tried to be dissected. Only | |
785 | * &struct batadv_unicast packets are actually processed because they contain an | |
786 | * inner ethernet header and are usually followed by actual network header. This | |
787 | * allows the flow dissector to continue processing the packet. | |
788 | * | |
789 | * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found, | |
790 | * FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation, | |
791 | * otherwise FLOW_DISSECT_RET_OUT_BAD | |
792 | */ | |
793 | static enum flow_dissect_ret | |
794 | __skb_flow_dissect_batadv(const struct sk_buff *skb, | |
795 | struct flow_dissector_key_control *key_control, | |
f96533cd AL |
796 | const void *data, __be16 *p_proto, int *p_nhoff, |
797 | int hlen, unsigned int flags) | |
5b0890a9 SE |
798 | { |
799 | struct { | |
800 | struct batadv_unicast_packet batadv_unicast; | |
801 | struct ethhdr eth; | |
802 | } *hdr, _hdr; | |
803 | ||
804 | hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen, | |
805 | &_hdr); | |
806 | if (!hdr) | |
807 | return FLOW_DISSECT_RET_OUT_BAD; | |
808 | ||
809 | if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION) | |
810 | return FLOW_DISSECT_RET_OUT_BAD; | |
811 | ||
812 | if (hdr->batadv_unicast.packet_type != BATADV_UNICAST) | |
813 | return FLOW_DISSECT_RET_OUT_BAD; | |
814 | ||
815 | *p_proto = hdr->eth.h_proto; | |
816 | *p_nhoff += sizeof(*hdr); | |
817 | ||
818 | key_control->flags |= FLOW_DIS_ENCAPSULATION; | |
819 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) | |
820 | return FLOW_DISSECT_RET_OUT_GOOD; | |
821 | ||
822 | return FLOW_DISSECT_RET_PROTO_AGAIN; | |
823 | } | |
824 | ||
ac4bb5de JP |
825 | static void |
826 | __skb_flow_dissect_tcp(const struct sk_buff *skb, | |
827 | struct flow_dissector *flow_dissector, | |
f96533cd AL |
828 | void *target_container, const void *data, |
829 | int thoff, int hlen) | |
ac4bb5de JP |
830 | { |
831 | struct flow_dissector_key_tcp *key_tcp; | |
832 | struct tcphdr *th, _th; | |
833 | ||
834 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP)) | |
835 | return; | |
836 | ||
837 | th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th); | |
838 | if (!th) | |
839 | return; | |
840 | ||
841 | if (unlikely(__tcp_hdrlen(th) < sizeof(_th))) | |
842 | return; | |
843 | ||
844 | key_tcp = skb_flow_dissector_target(flow_dissector, | |
845 | FLOW_DISSECTOR_KEY_TCP, | |
846 | target_container); | |
847 | key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF)); | |
848 | } | |
849 | ||
8ffb055b YK |
850 | static void |
851 | __skb_flow_dissect_ports(const struct sk_buff *skb, | |
852 | struct flow_dissector *flow_dissector, | |
f96533cd AL |
853 | void *target_container, const void *data, |
854 | int nhoff, u8 ip_proto, int hlen) | |
8ffb055b YK |
855 | { |
856 | enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX; | |
857 | struct flow_dissector_key_ports *key_ports; | |
858 | ||
859 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS)) | |
860 | dissector_ports = FLOW_DISSECTOR_KEY_PORTS; | |
861 | else if (dissector_uses_key(flow_dissector, | |
862 | FLOW_DISSECTOR_KEY_PORTS_RANGE)) | |
863 | dissector_ports = FLOW_DISSECTOR_KEY_PORTS_RANGE; | |
864 | ||
865 | if (dissector_ports == FLOW_DISSECTOR_KEY_MAX) | |
866 | return; | |
867 | ||
868 | key_ports = skb_flow_dissector_target(flow_dissector, | |
869 | dissector_ports, | |
870 | target_container); | |
871 | key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto, | |
872 | data, hlen); | |
873 | } | |
874 | ||
518d8a2e OG |
875 | static void |
876 | __skb_flow_dissect_ipv4(const struct sk_buff *skb, | |
877 | struct flow_dissector *flow_dissector, | |
f96533cd AL |
878 | void *target_container, const void *data, |
879 | const struct iphdr *iph) | |
518d8a2e OG |
880 | { |
881 | struct flow_dissector_key_ip *key_ip; | |
882 | ||
883 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP)) | |
884 | return; | |
885 | ||
886 | key_ip = skb_flow_dissector_target(flow_dissector, | |
887 | FLOW_DISSECTOR_KEY_IP, | |
888 | target_container); | |
889 | key_ip->tos = iph->tos; | |
890 | key_ip->ttl = iph->ttl; | |
891 | } | |
892 | ||
893 | static void | |
894 | __skb_flow_dissect_ipv6(const struct sk_buff *skb, | |
895 | struct flow_dissector *flow_dissector, | |
f96533cd AL |
896 | void *target_container, const void *data, |
897 | const struct ipv6hdr *iph) | |
518d8a2e OG |
898 | { |
899 | struct flow_dissector_key_ip *key_ip; | |
900 | ||
901 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP)) | |
902 | return; | |
903 | ||
904 | key_ip = skb_flow_dissector_target(flow_dissector, | |
905 | FLOW_DISSECTOR_KEY_IP, | |
906 | target_container); | |
907 | key_ip->tos = ipv6_get_dsfield(iph); | |
908 | key_ip->ttl = iph->hop_limit; | |
909 | } | |
910 | ||
1eed4dfb TH |
911 | /* Maximum number of protocol headers that can be parsed in |
912 | * __skb_flow_dissect | |
913 | */ | |
914 | #define MAX_FLOW_DISSECT_HDRS 15 | |
915 | ||
916 | static bool skb_flow_dissect_allowed(int *num_hdrs) | |
917 | { | |
918 | ++*num_hdrs; | |
919 | ||
920 | return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS); | |
921 | } | |
922 | ||
d58e468b PP |
923 | static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys, |
924 | struct flow_dissector *flow_dissector, | |
925 | void *target_container) | |
926 | { | |
59fb9b62 | 927 | struct flow_dissector_key_ports *key_ports = NULL; |
d58e468b PP |
928 | struct flow_dissector_key_control *key_control; |
929 | struct flow_dissector_key_basic *key_basic; | |
930 | struct flow_dissector_key_addrs *key_addrs; | |
71c99e32 | 931 | struct flow_dissector_key_tags *key_tags; |
d58e468b PP |
932 | |
933 | key_control = skb_flow_dissector_target(flow_dissector, | |
934 | FLOW_DISSECTOR_KEY_CONTROL, | |
935 | target_container); | |
936 | key_control->thoff = flow_keys->thoff; | |
937 | if (flow_keys->is_frag) | |
938 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; | |
939 | if (flow_keys->is_first_frag) | |
940 | key_control->flags |= FLOW_DIS_FIRST_FRAG; | |
941 | if (flow_keys->is_encap) | |
942 | key_control->flags |= FLOW_DIS_ENCAPSULATION; | |
943 | ||
944 | key_basic = skb_flow_dissector_target(flow_dissector, | |
945 | FLOW_DISSECTOR_KEY_BASIC, | |
946 | target_container); | |
947 | key_basic->n_proto = flow_keys->n_proto; | |
948 | key_basic->ip_proto = flow_keys->ip_proto; | |
949 | ||
950 | if (flow_keys->addr_proto == ETH_P_IP && | |
951 | dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) { | |
952 | key_addrs = skb_flow_dissector_target(flow_dissector, | |
953 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
954 | target_container); | |
955 | key_addrs->v4addrs.src = flow_keys->ipv4_src; | |
956 | key_addrs->v4addrs.dst = flow_keys->ipv4_dst; | |
957 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
958 | } else if (flow_keys->addr_proto == ETH_P_IPV6 && | |
959 | dissector_uses_key(flow_dissector, | |
960 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
961 | key_addrs = skb_flow_dissector_target(flow_dissector, | |
962 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
963 | target_container); | |
1e3d976d GS |
964 | memcpy(&key_addrs->v6addrs.src, &flow_keys->ipv6_src, |
965 | sizeof(key_addrs->v6addrs.src)); | |
966 | memcpy(&key_addrs->v6addrs.dst, &flow_keys->ipv6_dst, | |
967 | sizeof(key_addrs->v6addrs.dst)); | |
d58e468b PP |
968 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; |
969 | } | |
970 | ||
59fb9b62 | 971 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS)) |
d58e468b PP |
972 | key_ports = skb_flow_dissector_target(flow_dissector, |
973 | FLOW_DISSECTOR_KEY_PORTS, | |
974 | target_container); | |
59fb9b62 YK |
975 | else if (dissector_uses_key(flow_dissector, |
976 | FLOW_DISSECTOR_KEY_PORTS_RANGE)) | |
977 | key_ports = skb_flow_dissector_target(flow_dissector, | |
978 | FLOW_DISSECTOR_KEY_PORTS_RANGE, | |
979 | target_container); | |
980 | ||
981 | if (key_ports) { | |
d58e468b PP |
982 | key_ports->src = flow_keys->sport; |
983 | key_ports->dst = flow_keys->dport; | |
984 | } | |
71c99e32 SF |
985 | |
986 | if (dissector_uses_key(flow_dissector, | |
987 | FLOW_DISSECTOR_KEY_FLOW_LABEL)) { | |
988 | key_tags = skb_flow_dissector_target(flow_dissector, | |
989 | FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
990 | target_container); | |
991 | key_tags->flow_label = ntohl(flow_keys->flow_label); | |
992 | } | |
d58e468b PP |
993 | } |
994 | ||
0ba98502 SL |
995 | u32 bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx, |
996 | __be16 proto, int nhoff, int hlen, unsigned int flags) | |
089b19a9 SF |
997 | { |
998 | struct bpf_flow_keys *flow_keys = ctx->flow_keys; | |
999 | u32 result; | |
c8aa7038 SF |
1000 | |
1001 | /* Pass parameters to the BPF program */ | |
1002 | memset(flow_keys, 0, sizeof(*flow_keys)); | |
089b19a9 SF |
1003 | flow_keys->n_proto = proto; |
1004 | flow_keys->nhoff = nhoff; | |
c8aa7038 SF |
1005 | flow_keys->thoff = flow_keys->nhoff; |
1006 | ||
086f9568 SF |
1007 | BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG != |
1008 | (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG); | |
1009 | BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL != | |
1010 | (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
1011 | BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP != | |
1012 | (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP); | |
1013 | flow_keys->flags = flags; | |
1014 | ||
3d9f773c | 1015 | result = bpf_prog_run_pin_on_cpu(prog, ctx); |
c8aa7038 | 1016 | |
089b19a9 | 1017 | flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen); |
c8aa7038 | 1018 | flow_keys->thoff = clamp_t(u16, flow_keys->thoff, |
089b19a9 | 1019 | flow_keys->nhoff, hlen); |
c8aa7038 | 1020 | |
0ba98502 | 1021 | return result; |
c8aa7038 SF |
1022 | } |
1023 | ||
f86d1fbb | 1024 | static bool is_pppoe_ses_hdr_valid(const struct pppoe_hdr *hdr) |
46126db9 | 1025 | { |
f86d1fbb | 1026 | return hdr->ver == 1 && hdr->type == 1 && hdr->code == 0; |
46126db9 WD |
1027 | } |
1028 | ||
453a940e WC |
1029 | /** |
1030 | * __skb_flow_dissect - extract the flow_keys struct and return it | |
3cbf4ffb | 1031 | * @net: associated network namespace, derived from @skb if NULL |
453a940e | 1032 | * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified |
06635a35 JP |
1033 | * @flow_dissector: list of keys to dissect |
1034 | * @target_container: target structure to put dissected values into | |
453a940e WC |
1035 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
1036 | * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol | |
1037 | * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb) | |
1038 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
d79b3baf | 1039 | * @flags: flags that control the dissection process, e.g. |
1cc26450 | 1040 | * FLOW_DISSECTOR_F_STOP_AT_ENCAP. |
453a940e | 1041 | * |
06635a35 JP |
1042 | * The function will try to retrieve individual keys into target specified |
1043 | * by flow_dissector from either the skbuff or a raw buffer specified by the | |
1044 | * rest parameters. | |
1045 | * | |
1046 | * Caller must take care of zeroing target container memory. | |
453a940e | 1047 | */ |
3cbf4ffb SF |
1048 | bool __skb_flow_dissect(const struct net *net, |
1049 | const struct sk_buff *skb, | |
06635a35 | 1050 | struct flow_dissector *flow_dissector, |
f96533cd AL |
1051 | void *target_container, const void *data, |
1052 | __be16 proto, int nhoff, int hlen, unsigned int flags) | |
0744dd00 | 1053 | { |
42aecaa9 | 1054 | struct flow_dissector_key_control *key_control; |
06635a35 JP |
1055 | struct flow_dissector_key_basic *key_basic; |
1056 | struct flow_dissector_key_addrs *key_addrs; | |
d34af823 | 1057 | struct flow_dissector_key_tags *key_tags; |
f6a66927 | 1058 | struct flow_dissector_key_vlan *key_vlan; |
3a1214e8 | 1059 | enum flow_dissect_ret fdret; |
24c590e3 | 1060 | enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX; |
58cff782 GN |
1061 | bool mpls_el = false; |
1062 | int mpls_lse = 0; | |
1eed4dfb | 1063 | int num_hdrs = 0; |
8e690ffd | 1064 | u8 ip_proto = 0; |
34fad54c | 1065 | bool ret; |
0744dd00 | 1066 | |
690e36e7 DM |
1067 | if (!data) { |
1068 | data = skb->data; | |
d5709f7a HHZ |
1069 | proto = skb_vlan_tag_present(skb) ? |
1070 | skb->vlan_proto : skb->protocol; | |
453a940e | 1071 | nhoff = skb_network_offset(skb); |
690e36e7 | 1072 | hlen = skb_headlen(skb); |
2d571645 | 1073 | #if IS_ENABLED(CONFIG_NET_DSA) |
8bef0af0 AL |
1074 | if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) && |
1075 | proto == htons(ETH_P_XDSA))) { | |
570d0a58 | 1076 | struct metadata_dst *md_dst = skb_metadata_dst(skb); |
43e66528 | 1077 | const struct dsa_device_ops *ops; |
8bef0af0 | 1078 | int offset = 0; |
43e66528 JC |
1079 | |
1080 | ops = skb->dev->dsa_ptr->tag_ops; | |
ec133572 | 1081 | /* Only DSA header taggers break flow dissection */ |
570d0a58 FF |
1082 | if (ops->needed_headroom && |
1083 | (!md_dst || md_dst->type != METADATA_HW_PORT_MUX)) { | |
54fec335 VO |
1084 | if (ops->flow_dissect) |
1085 | ops->flow_dissect(skb, &proto, &offset); | |
1086 | else | |
1087 | dsa_tag_generic_flow_dissect(skb, | |
1088 | &proto, | |
1089 | &offset); | |
43e66528 JC |
1090 | hlen -= offset; |
1091 | nhoff += offset; | |
1092 | } | |
1093 | } | |
2d571645 | 1094 | #endif |
690e36e7 DM |
1095 | } |
1096 | ||
42aecaa9 TH |
1097 | /* It is ensured by skb_flow_dissector_init() that control key will |
1098 | * be always present. | |
1099 | */ | |
1100 | key_control = skb_flow_dissector_target(flow_dissector, | |
1101 | FLOW_DISSECTOR_KEY_CONTROL, | |
1102 | target_container); | |
1103 | ||
06635a35 JP |
1104 | /* It is ensured by skb_flow_dissector_init() that basic key will |
1105 | * be always present. | |
1106 | */ | |
1107 | key_basic = skb_flow_dissector_target(flow_dissector, | |
1108 | FLOW_DISSECTOR_KEY_BASIC, | |
1109 | target_container); | |
0744dd00 | 1110 | |
d0e13a14 | 1111 | if (skb) { |
3cbf4ffb SF |
1112 | if (!net) { |
1113 | if (skb->dev) | |
1114 | net = dev_net(skb->dev); | |
1115 | else if (skb->sk) | |
1116 | net = sock_net(skb->sk); | |
3cbf4ffb | 1117 | } |
9b52e3f2 | 1118 | } |
c8aa7038 | 1119 | |
120f1c85 | 1120 | DEBUG_NET_WARN_ON_ONCE(!net); |
9b52e3f2 | 1121 | if (net) { |
a3fd7cee | 1122 | enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR; |
695c1214 | 1123 | struct bpf_prog_array *run_array; |
a3fd7cee | 1124 | |
9b52e3f2 | 1125 | rcu_read_lock(); |
695c1214 JS |
1126 | run_array = rcu_dereference(init_net.bpf.run_array[type]); |
1127 | if (!run_array) | |
1128 | run_array = rcu_dereference(net->bpf.run_array[type]); | |
a11c397c | 1129 | |
695c1214 | 1130 | if (run_array) { |
9b52e3f2 SF |
1131 | struct bpf_flow_keys flow_keys; |
1132 | struct bpf_flow_dissector ctx = { | |
1133 | .flow_keys = &flow_keys, | |
1134 | .data = data, | |
1135 | .data_end = data + hlen, | |
1136 | }; | |
1137 | __be16 n_proto = proto; | |
695c1214 | 1138 | struct bpf_prog *prog; |
0ba98502 | 1139 | u32 result; |
9b52e3f2 SF |
1140 | |
1141 | if (skb) { | |
1142 | ctx.skb = skb; | |
1143 | /* we can't use 'proto' in the skb case | |
1144 | * because it might be set to skb->vlan_proto | |
1145 | * which has been pulled from the data | |
1146 | */ | |
1147 | n_proto = skb->protocol; | |
1148 | } | |
1149 | ||
695c1214 | 1150 | prog = READ_ONCE(run_array->items[0].prog); |
0ba98502 SL |
1151 | result = bpf_flow_dissect(prog, &ctx, n_proto, nhoff, |
1152 | hlen, flags); | |
91350fe1 SL |
1153 | if (result == BPF_FLOW_DISSECTOR_CONTINUE) |
1154 | goto dissect_continue; | |
c8aa7038 SF |
1155 | __skb_flow_bpf_to_target(&flow_keys, flow_dissector, |
1156 | target_container); | |
1157 | rcu_read_unlock(); | |
0ba98502 | 1158 | return result == BPF_OK; |
c8aa7038 | 1159 | } |
91350fe1 | 1160 | dissect_continue: |
d58e468b | 1161 | rcu_read_unlock(); |
d58e468b | 1162 | } |
d58e468b | 1163 | |
20a17bf6 DM |
1164 | if (dissector_uses_key(flow_dissector, |
1165 | FLOW_DISSECTOR_KEY_ETH_ADDRS)) { | |
67a900cc JP |
1166 | struct ethhdr *eth = eth_hdr(skb); |
1167 | struct flow_dissector_key_eth_addrs *key_eth_addrs; | |
1168 | ||
1169 | key_eth_addrs = skb_flow_dissector_target(flow_dissector, | |
1170 | FLOW_DISSECTOR_KEY_ETH_ADDRS, | |
1171 | target_container); | |
1b808993 | 1172 | memcpy(key_eth_addrs, eth, sizeof(*key_eth_addrs)); |
67a900cc JP |
1173 | } |
1174 | ||
34951fcf BS |
1175 | if (dissector_uses_key(flow_dissector, |
1176 | FLOW_DISSECTOR_KEY_NUM_OF_VLANS)) { | |
1177 | struct flow_dissector_key_num_of_vlans *key_num_of_vlans; | |
1178 | ||
1179 | key_num_of_vlans = skb_flow_dissector_target(flow_dissector, | |
1180 | FLOW_DISSECTOR_KEY_NUM_OF_VLANS, | |
1181 | target_container); | |
1182 | key_num_of_vlans->num_of_vlans = 0; | |
1183 | } | |
1184 | ||
c5ef188e | 1185 | proto_again: |
3a1214e8 TH |
1186 | fdret = FLOW_DISSECT_RET_CONTINUE; |
1187 | ||
0744dd00 | 1188 | switch (proto) { |
2b8837ae | 1189 | case htons(ETH_P_IP): { |
0744dd00 ED |
1190 | const struct iphdr *iph; |
1191 | struct iphdr _iph; | |
3a1214e8 | 1192 | |
690e36e7 | 1193 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
3a1214e8 TH |
1194 | if (!iph || iph->ihl < 5) { |
1195 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1196 | break; | |
1197 | } | |
1198 | ||
3797d3e8 | 1199 | nhoff += iph->ihl * 4; |
0744dd00 | 1200 | |
3797d3e8 | 1201 | ip_proto = iph->protocol; |
3797d3e8 | 1202 | |
918c023f AD |
1203 | if (dissector_uses_key(flow_dissector, |
1204 | FLOW_DISSECTOR_KEY_IPV4_ADDRS)) { | |
1205 | key_addrs = skb_flow_dissector_target(flow_dissector, | |
1206 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
1207 | target_container); | |
1208 | ||
323e0cb4 GS |
1209 | memcpy(&key_addrs->v4addrs.src, &iph->saddr, |
1210 | sizeof(key_addrs->v4addrs.src)); | |
1211 | memcpy(&key_addrs->v4addrs.dst, &iph->daddr, | |
1212 | sizeof(key_addrs->v4addrs.dst)); | |
918c023f AD |
1213 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
1214 | } | |
807e165d | 1215 | |
d2126838 DC |
1216 | __skb_flow_dissect_ipv4(skb, flow_dissector, |
1217 | target_container, data, iph); | |
1218 | ||
807e165d | 1219 | if (ip_is_fragment(iph)) { |
4b36993d | 1220 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
807e165d TH |
1221 | |
1222 | if (iph->frag_off & htons(IP_OFFSET)) { | |
3a1214e8 TH |
1223 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
1224 | break; | |
807e165d | 1225 | } else { |
4b36993d | 1226 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
3a1214e8 TH |
1227 | if (!(flags & |
1228 | FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) { | |
1229 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1230 | break; | |
1231 | } | |
807e165d TH |
1232 | } |
1233 | } | |
1234 | ||
0744dd00 ED |
1235 | break; |
1236 | } | |
2b8837ae | 1237 | case htons(ETH_P_IPV6): { |
0744dd00 ED |
1238 | const struct ipv6hdr *iph; |
1239 | struct ipv6hdr _iph; | |
19469a87 | 1240 | |
690e36e7 | 1241 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
3a1214e8 TH |
1242 | if (!iph) { |
1243 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1244 | break; | |
1245 | } | |
0744dd00 ED |
1246 | |
1247 | ip_proto = iph->nexthdr; | |
0744dd00 | 1248 | nhoff += sizeof(struct ipv6hdr); |
19469a87 | 1249 | |
20a17bf6 DM |
1250 | if (dissector_uses_key(flow_dissector, |
1251 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
b3c3106c AD |
1252 | key_addrs = skb_flow_dissector_target(flow_dissector, |
1253 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
1254 | target_container); | |
5af7fb6e | 1255 | |
323e0cb4 GS |
1256 | memcpy(&key_addrs->v6addrs.src, &iph->saddr, |
1257 | sizeof(key_addrs->v6addrs.src)); | |
1258 | memcpy(&key_addrs->v6addrs.dst, &iph->daddr, | |
1259 | sizeof(key_addrs->v6addrs.dst)); | |
c3f83241 | 1260 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; |
b924933c | 1261 | } |
87ee9e52 | 1262 | |
461547f3 AD |
1263 | if ((dissector_uses_key(flow_dissector, |
1264 | FLOW_DISSECTOR_KEY_FLOW_LABEL) || | |
1265 | (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) && | |
1266 | ip6_flowlabel(iph)) { | |
1267 | __be32 flow_label = ip6_flowlabel(iph); | |
1268 | ||
20a17bf6 DM |
1269 | if (dissector_uses_key(flow_dissector, |
1270 | FLOW_DISSECTOR_KEY_FLOW_LABEL)) { | |
87ee9e52 TH |
1271 | key_tags = skb_flow_dissector_target(flow_dissector, |
1272 | FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
1273 | target_container); | |
1274 | key_tags->flow_label = ntohl(flow_label); | |
12c227ec | 1275 | } |
3a1214e8 TH |
1276 | if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) { |
1277 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1278 | break; | |
1279 | } | |
19469a87 TH |
1280 | } |
1281 | ||
518d8a2e OG |
1282 | __skb_flow_dissect_ipv6(skb, flow_dissector, |
1283 | target_container, data, iph); | |
1284 | ||
0744dd00 ED |
1285 | break; |
1286 | } | |
2b8837ae JP |
1287 | case htons(ETH_P_8021AD): |
1288 | case htons(ETH_P_8021Q): { | |
24c590e3 | 1289 | const struct vlan_hdr *vlan = NULL; |
bc72f3dd | 1290 | struct vlan_hdr _vlan; |
2064c3d4 | 1291 | __be16 saved_vlan_tpid = proto; |
0744dd00 | 1292 | |
24c590e3 JL |
1293 | if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX && |
1294 | skb && skb_vlan_tag_present(skb)) { | |
d5709f7a | 1295 | proto = skb->protocol; |
24c590e3 | 1296 | } else { |
d5709f7a HHZ |
1297 | vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), |
1298 | data, hlen, &_vlan); | |
3a1214e8 TH |
1299 | if (!vlan) { |
1300 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1301 | break; | |
1302 | } | |
1303 | ||
d5709f7a HHZ |
1304 | proto = vlan->h_vlan_encapsulated_proto; |
1305 | nhoff += sizeof(*vlan); | |
d5709f7a | 1306 | } |
0744dd00 | 1307 | |
9f87eb42 QY |
1308 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_NUM_OF_VLANS) && |
1309 | !(key_control->flags & FLOW_DIS_ENCAPSULATION)) { | |
34951fcf BS |
1310 | struct flow_dissector_key_num_of_vlans *key_nvs; |
1311 | ||
1312 | key_nvs = skb_flow_dissector_target(flow_dissector, | |
1313 | FLOW_DISSECTOR_KEY_NUM_OF_VLANS, | |
1314 | target_container); | |
1315 | key_nvs->num_of_vlans++; | |
1316 | } | |
1317 | ||
24c590e3 JL |
1318 | if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) { |
1319 | dissector_vlan = FLOW_DISSECTOR_KEY_VLAN; | |
1320 | } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) { | |
1321 | dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN; | |
1322 | } else { | |
1323 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1324 | break; | |
1325 | } | |
1326 | ||
1327 | if (dissector_uses_key(flow_dissector, dissector_vlan)) { | |
f6a66927 | 1328 | key_vlan = skb_flow_dissector_target(flow_dissector, |
24c590e3 | 1329 | dissector_vlan, |
d34af823 TH |
1330 | target_container); |
1331 | ||
24c590e3 | 1332 | if (!vlan) { |
f6a66927 | 1333 | key_vlan->vlan_id = skb_vlan_tag_get_id(skb); |
9b319148 | 1334 | key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb); |
f6a66927 HHZ |
1335 | } else { |
1336 | key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) & | |
d5709f7a | 1337 | VLAN_VID_MASK; |
f6a66927 HHZ |
1338 | key_vlan->vlan_priority = |
1339 | (ntohs(vlan->h_vlan_TCI) & | |
1340 | VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT; | |
1341 | } | |
2064c3d4 | 1342 | key_vlan->vlan_tpid = saved_vlan_tpid; |
2105f700 | 1343 | key_vlan->vlan_eth_type = proto; |
d34af823 TH |
1344 | } |
1345 | ||
3a1214e8 TH |
1346 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; |
1347 | break; | |
0744dd00 | 1348 | } |
2b8837ae | 1349 | case htons(ETH_P_PPP_SES): { |
0744dd00 ED |
1350 | struct { |
1351 | struct pppoe_hdr hdr; | |
1352 | __be16 proto; | |
1353 | } *hdr, _hdr; | |
46126db9 WD |
1354 | u16 ppp_proto; |
1355 | ||
690e36e7 | 1356 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
3a1214e8 TH |
1357 | if (!hdr) { |
1358 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1359 | break; | |
1360 | } | |
1361 | ||
f86d1fbb | 1362 | if (!is_pppoe_ses_hdr_valid(&hdr->hdr)) { |
46126db9 WD |
1363 | fdret = FLOW_DISSECT_RET_OUT_BAD; |
1364 | break; | |
1365 | } | |
1366 | ||
1367 | /* least significant bit of the most significant octet | |
1368 | * indicates if protocol field was compressed | |
1369 | */ | |
1370 | ppp_proto = ntohs(hdr->proto); | |
1371 | if (ppp_proto & 0x0100) { | |
1372 | ppp_proto = ppp_proto >> 8; | |
1373 | nhoff += PPPOE_SES_HLEN - 1; | |
1374 | } else { | |
1375 | nhoff += PPPOE_SES_HLEN; | |
1376 | } | |
1377 | ||
1378 | if (ppp_proto == PPP_IP) { | |
3a1214e8 TH |
1379 | proto = htons(ETH_P_IP); |
1380 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
46126db9 | 1381 | } else if (ppp_proto == PPP_IPV6) { |
3a1214e8 TH |
1382 | proto = htons(ETH_P_IPV6); |
1383 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
46126db9 WD |
1384 | } else if (ppp_proto == PPP_MPLS_UC) { |
1385 | proto = htons(ETH_P_MPLS_UC); | |
1386 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1387 | } else if (ppp_proto == PPP_MPLS_MC) { | |
1388 | proto = htons(ETH_P_MPLS_MC); | |
1389 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1390 | } else if (ppp_proto_is_valid(ppp_proto)) { | |
1391 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1392 | } else { | |
3a1214e8 TH |
1393 | fdret = FLOW_DISSECT_RET_OUT_BAD; |
1394 | break; | |
0744dd00 | 1395 | } |
46126db9 WD |
1396 | |
1397 | if (dissector_uses_key(flow_dissector, | |
1398 | FLOW_DISSECTOR_KEY_PPPOE)) { | |
1399 | struct flow_dissector_key_pppoe *key_pppoe; | |
1400 | ||
1401 | key_pppoe = skb_flow_dissector_target(flow_dissector, | |
1402 | FLOW_DISSECTOR_KEY_PPPOE, | |
1403 | target_container); | |
1404 | key_pppoe->session_id = hdr->hdr.sid; | |
1405 | key_pppoe->ppp_proto = htons(ppp_proto); | |
1406 | key_pppoe->type = htons(ETH_P_PPP_SES); | |
1407 | } | |
3a1214e8 | 1408 | break; |
0744dd00 | 1409 | } |
08bfc9cb | 1410 | case htons(ETH_P_TIPC): { |
8d6e79d3 JM |
1411 | struct tipc_basic_hdr *hdr, _hdr; |
1412 | ||
1413 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), | |
1414 | data, hlen, &_hdr); | |
3a1214e8 TH |
1415 | if (!hdr) { |
1416 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1417 | break; | |
1418 | } | |
06635a35 | 1419 | |
20a17bf6 | 1420 | if (dissector_uses_key(flow_dissector, |
8d6e79d3 | 1421 | FLOW_DISSECTOR_KEY_TIPC)) { |
06635a35 | 1422 | key_addrs = skb_flow_dissector_target(flow_dissector, |
8d6e79d3 | 1423 | FLOW_DISSECTOR_KEY_TIPC, |
06635a35 | 1424 | target_container); |
8d6e79d3 JM |
1425 | key_addrs->tipckey.key = tipc_hdr_rps_key(hdr); |
1426 | key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC; | |
06635a35 | 1427 | } |
3a1214e8 TH |
1428 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
1429 | break; | |
08bfc9cb | 1430 | } |
b3baa0fb TH |
1431 | |
1432 | case htons(ETH_P_MPLS_UC): | |
4a5d6c8b | 1433 | case htons(ETH_P_MPLS_MC): |
3a1214e8 | 1434 | fdret = __skb_flow_dissect_mpls(skb, flow_dissector, |
4a5d6c8b | 1435 | target_container, data, |
58cff782 GN |
1436 | nhoff, hlen, mpls_lse, |
1437 | &mpls_el); | |
1438 | nhoff += sizeof(struct mpls_label); | |
1439 | mpls_lse++; | |
3a1214e8 | 1440 | break; |
56193d1b | 1441 | case htons(ETH_P_FCOE): |
3a1214e8 TH |
1442 | if ((hlen - nhoff) < FCOE_HEADER_LEN) { |
1443 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1444 | break; | |
1445 | } | |
224516b3 AD |
1446 | |
1447 | nhoff += FCOE_HEADER_LEN; | |
3a1214e8 TH |
1448 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
1449 | break; | |
55733350 SH |
1450 | |
1451 | case htons(ETH_P_ARP): | |
9bf881ff | 1452 | case htons(ETH_P_RARP): |
3a1214e8 | 1453 | fdret = __skb_flow_dissect_arp(skb, flow_dissector, |
9bf881ff | 1454 | target_container, data, |
3a1214e8 TH |
1455 | nhoff, hlen); |
1456 | break; | |
1457 | ||
5b0890a9 SE |
1458 | case htons(ETH_P_BATMAN): |
1459 | fdret = __skb_flow_dissect_batadv(skb, key_control, data, | |
1460 | &proto, &nhoff, hlen, flags); | |
1461 | break; | |
1462 | ||
4f1cc51f EBE |
1463 | case htons(ETH_P_1588): { |
1464 | struct ptp_header *hdr, _hdr; | |
1465 | ||
1466 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, | |
1467 | hlen, &_hdr); | |
1468 | if (!hdr) { | |
1469 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1470 | break; | |
1471 | } | |
1472 | ||
75ad80ed | 1473 | nhoff += sizeof(struct ptp_header); |
4f1cc51f EBE |
1474 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
1475 | break; | |
1476 | } | |
1477 | ||
f65e5844 | 1478 | case htons(ETH_P_PRP): |
bf08824a KK |
1479 | case htons(ETH_P_HSR): { |
1480 | struct hsr_tag *hdr, _hdr; | |
1481 | ||
1482 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, | |
1483 | &_hdr); | |
1484 | if (!hdr) { | |
1485 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1486 | break; | |
1487 | } | |
1488 | ||
1489 | proto = hdr->encap_proto; | |
1490 | nhoff += HSR_HLEN; | |
1491 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1492 | break; | |
1493 | } | |
1494 | ||
d7ad70b5 ZD |
1495 | case htons(ETH_P_CFM): |
1496 | fdret = __skb_flow_dissect_cfm(skb, flow_dissector, | |
1497 | target_container, data, | |
1498 | nhoff, hlen); | |
1499 | break; | |
1500 | ||
3a1214e8 TH |
1501 | default: |
1502 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1503 | break; | |
1504 | } | |
1505 | ||
1506 | /* Process result of proto processing */ | |
1507 | switch (fdret) { | |
1508 | case FLOW_DISSECT_RET_OUT_GOOD: | |
1509 | goto out_good; | |
1510 | case FLOW_DISSECT_RET_PROTO_AGAIN: | |
1eed4dfb TH |
1511 | if (skb_flow_dissect_allowed(&num_hdrs)) |
1512 | goto proto_again; | |
1513 | goto out_good; | |
3a1214e8 TH |
1514 | case FLOW_DISSECT_RET_CONTINUE: |
1515 | case FLOW_DISSECT_RET_IPPROTO_AGAIN: | |
1516 | break; | |
1517 | case FLOW_DISSECT_RET_OUT_BAD: | |
0744dd00 | 1518 | default: |
a6e544b0 | 1519 | goto out_bad; |
0744dd00 ED |
1520 | } |
1521 | ||
6a74fcf4 | 1522 | ip_proto_again: |
3a1214e8 TH |
1523 | fdret = FLOW_DISSECT_RET_CONTINUE; |
1524 | ||
0744dd00 | 1525 | switch (ip_proto) { |
7c92de8e | 1526 | case IPPROTO_GRE: |
6de6e46d YK |
1527 | if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) { |
1528 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1529 | break; | |
1530 | } | |
1531 | ||
3a1214e8 | 1532 | fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector, |
7c92de8e | 1533 | target_container, data, |
3a1214e8 TH |
1534 | &proto, &nhoff, &hlen, flags); |
1535 | break; | |
1536 | ||
6a74fcf4 TH |
1537 | case NEXTHDR_HOP: |
1538 | case NEXTHDR_ROUTING: | |
1539 | case NEXTHDR_DEST: { | |
1540 | u8 _opthdr[2], *opthdr; | |
1541 | ||
1542 | if (proto != htons(ETH_P_IPV6)) | |
1543 | break; | |
1544 | ||
1545 | opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr), | |
1546 | data, hlen, &_opthdr); | |
3a1214e8 TH |
1547 | if (!opthdr) { |
1548 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1549 | break; | |
1550 | } | |
6a74fcf4 | 1551 | |
1e98a0f0 ED |
1552 | ip_proto = opthdr[0]; |
1553 | nhoff += (opthdr[1] + 1) << 3; | |
6a74fcf4 | 1554 | |
3a1214e8 TH |
1555 | fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN; |
1556 | break; | |
6a74fcf4 | 1557 | } |
b840f28b TH |
1558 | case NEXTHDR_FRAGMENT: { |
1559 | struct frag_hdr _fh, *fh; | |
1560 | ||
1561 | if (proto != htons(ETH_P_IPV6)) | |
1562 | break; | |
1563 | ||
1564 | fh = __skb_header_pointer(skb, nhoff, sizeof(_fh), | |
1565 | data, hlen, &_fh); | |
1566 | ||
3a1214e8 TH |
1567 | if (!fh) { |
1568 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1569 | break; | |
1570 | } | |
b840f28b | 1571 | |
4b36993d | 1572 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
b840f28b TH |
1573 | |
1574 | nhoff += sizeof(_fh); | |
43d2ccb3 | 1575 | ip_proto = fh->nexthdr; |
b840f28b TH |
1576 | |
1577 | if (!(fh->frag_off & htons(IP6_OFFSET))) { | |
4b36993d | 1578 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
3a1214e8 TH |
1579 | if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) { |
1580 | fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN; | |
1581 | break; | |
1582 | } | |
b840f28b | 1583 | } |
3a1214e8 TH |
1584 | |
1585 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1586 | break; | |
b840f28b | 1587 | } |
0744dd00 | 1588 | case IPPROTO_IPIP: |
6de6e46d YK |
1589 | if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) { |
1590 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1591 | break; | |
1592 | } | |
1593 | ||
fca41895 | 1594 | proto = htons(ETH_P_IP); |
823b9693 | 1595 | |
4b36993d | 1596 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
3a1214e8 TH |
1597 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) { |
1598 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1599 | break; | |
1600 | } | |
1601 | ||
1602 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1603 | break; | |
823b9693 | 1604 | |
b438f940 | 1605 | case IPPROTO_IPV6: |
6de6e46d YK |
1606 | if (flags & FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP) { |
1607 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1608 | break; | |
1609 | } | |
1610 | ||
b438f940 | 1611 | proto = htons(ETH_P_IPV6); |
823b9693 | 1612 | |
4b36993d | 1613 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
3a1214e8 TH |
1614 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) { |
1615 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1616 | break; | |
1617 | } | |
1618 | ||
1619 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1620 | break; | |
1621 | ||
823b9693 | 1622 | |
b3baa0fb TH |
1623 | case IPPROTO_MPLS: |
1624 | proto = htons(ETH_P_MPLS_UC); | |
3a1214e8 TH |
1625 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; |
1626 | break; | |
1627 | ||
ac4bb5de JP |
1628 | case IPPROTO_TCP: |
1629 | __skb_flow_dissect_tcp(skb, flow_dissector, target_container, | |
1630 | data, nhoff, hlen); | |
1631 | break; | |
3a1214e8 | 1632 | |
3b336d6f MC |
1633 | case IPPROTO_ICMP: |
1634 | case IPPROTO_ICMPV6: | |
1635 | __skb_flow_dissect_icmp(skb, flow_dissector, target_container, | |
1636 | data, nhoff, hlen); | |
1637 | break; | |
dda2fa08 WD |
1638 | case IPPROTO_L2TP: |
1639 | __skb_flow_dissect_l2tpv3(skb, flow_dissector, target_container, | |
1640 | data, nhoff, hlen); | |
1641 | break; | |
a57c34a8 RK |
1642 | case IPPROTO_ESP: |
1643 | __skb_flow_dissect_esp(skb, flow_dissector, target_container, | |
1644 | data, nhoff, hlen); | |
1645 | break; | |
1646 | case IPPROTO_AH: | |
1647 | __skb_flow_dissect_ah(skb, flow_dissector, target_container, | |
1648 | data, nhoff, hlen); | |
1649 | break; | |
0744dd00 ED |
1650 | default: |
1651 | break; | |
1652 | } | |
1653 | ||
8ffb055b YK |
1654 | if (!(key_control->flags & FLOW_DIS_IS_FRAGMENT)) |
1655 | __skb_flow_dissect_ports(skb, flow_dissector, target_container, | |
1656 | data, nhoff, ip_proto, hlen); | |
5af7fb6e | 1657 | |
3a1214e8 TH |
1658 | /* Process result of IP proto processing */ |
1659 | switch (fdret) { | |
1660 | case FLOW_DISSECT_RET_PROTO_AGAIN: | |
1eed4dfb TH |
1661 | if (skb_flow_dissect_allowed(&num_hdrs)) |
1662 | goto proto_again; | |
1663 | break; | |
3a1214e8 | 1664 | case FLOW_DISSECT_RET_IPPROTO_AGAIN: |
1eed4dfb TH |
1665 | if (skb_flow_dissect_allowed(&num_hdrs)) |
1666 | goto ip_proto_again; | |
1667 | break; | |
3a1214e8 TH |
1668 | case FLOW_DISSECT_RET_OUT_GOOD: |
1669 | case FLOW_DISSECT_RET_CONTINUE: | |
1670 | break; | |
1671 | case FLOW_DISSECT_RET_OUT_BAD: | |
1672 | default: | |
1673 | goto out_bad; | |
1674 | } | |
1675 | ||
a6e544b0 TH |
1676 | out_good: |
1677 | ret = true; | |
1678 | ||
34fad54c | 1679 | out: |
d0c081b4 | 1680 | key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen); |
a6e544b0 TH |
1681 | key_basic->n_proto = proto; |
1682 | key_basic->ip_proto = ip_proto; | |
a6e544b0 TH |
1683 | |
1684 | return ret; | |
34fad54c ED |
1685 | |
1686 | out_bad: | |
1687 | ret = false; | |
34fad54c | 1688 | goto out; |
0744dd00 | 1689 | } |
690e36e7 | 1690 | EXPORT_SYMBOL(__skb_flow_dissect); |
441d9d32 | 1691 | |
49ecc2e9 | 1692 | static siphash_aligned_key_t hashrnd; |
66415cf8 HFS |
1693 | static __always_inline void __flow_hash_secret_init(void) |
1694 | { | |
1695 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
1696 | } | |
1697 | ||
55667441 | 1698 | static const void *flow_keys_hash_start(const struct flow_keys *flow) |
42aecaa9 | 1699 | { |
55667441 ED |
1700 | BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT); |
1701 | return &flow->FLOW_KEYS_HASH_START_FIELD; | |
42aecaa9 TH |
1702 | } |
1703 | ||
20a17bf6 | 1704 | static inline size_t flow_keys_hash_length(const struct flow_keys *flow) |
42aecaa9 | 1705 | { |
c3f83241 | 1706 | size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs); |
d31e9558 | 1707 | |
42aecaa9 | 1708 | BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32)); |
c3f83241 TH |
1709 | |
1710 | switch (flow->control.addr_type) { | |
1711 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1712 | diff -= sizeof(flow->addrs.v4addrs); | |
1713 | break; | |
1714 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1715 | diff -= sizeof(flow->addrs.v6addrs); | |
1716 | break; | |
8d6e79d3 JM |
1717 | case FLOW_DISSECTOR_KEY_TIPC: |
1718 | diff -= sizeof(flow->addrs.tipckey); | |
9f249089 | 1719 | break; |
c3f83241 | 1720 | } |
55667441 | 1721 | return sizeof(*flow) - diff; |
c3f83241 TH |
1722 | } |
1723 | ||
1724 | __be32 flow_get_u32_src(const struct flow_keys *flow) | |
1725 | { | |
1726 | switch (flow->control.addr_type) { | |
1727 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1728 | return flow->addrs.v4addrs.src; | |
1729 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1730 | return (__force __be32)ipv6_addr_hash( | |
1731 | &flow->addrs.v6addrs.src); | |
8d6e79d3 JM |
1732 | case FLOW_DISSECTOR_KEY_TIPC: |
1733 | return flow->addrs.tipckey.key; | |
c3f83241 TH |
1734 | default: |
1735 | return 0; | |
1736 | } | |
1737 | } | |
1738 | EXPORT_SYMBOL(flow_get_u32_src); | |
1739 | ||
1740 | __be32 flow_get_u32_dst(const struct flow_keys *flow) | |
1741 | { | |
1742 | switch (flow->control.addr_type) { | |
1743 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1744 | return flow->addrs.v4addrs.dst; | |
1745 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1746 | return (__force __be32)ipv6_addr_hash( | |
1747 | &flow->addrs.v6addrs.dst); | |
1748 | default: | |
1749 | return 0; | |
1750 | } | |
1751 | } | |
1752 | EXPORT_SYMBOL(flow_get_u32_dst); | |
1753 | ||
1e60cebf | 1754 | /* Sort the source and destination IP and the ports, |
98298e6c MC |
1755 | * to have consistent hash within the two directions |
1756 | */ | |
c3f83241 TH |
1757 | static inline void __flow_hash_consistentify(struct flow_keys *keys) |
1758 | { | |
1759 | int addr_diff, i; | |
1760 | ||
1761 | switch (keys->control.addr_type) { | |
1762 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
64ae13ed LC |
1763 | if ((__force u32)keys->addrs.v4addrs.dst < |
1764 | (__force u32)keys->addrs.v4addrs.src) | |
c3f83241 | 1765 | swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst); |
1e60cebf | 1766 | |
1767 | if ((__force u16)keys->ports.dst < | |
1768 | (__force u16)keys->ports.src) { | |
c3f83241 TH |
1769 | swap(keys->ports.src, keys->ports.dst); |
1770 | } | |
1771 | break; | |
1772 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1773 | addr_diff = memcmp(&keys->addrs.v6addrs.dst, | |
1774 | &keys->addrs.v6addrs.src, | |
1775 | sizeof(keys->addrs.v6addrs.dst)); | |
1e60cebf | 1776 | if (addr_diff < 0) { |
c3f83241 TH |
1777 | for (i = 0; i < 4; i++) |
1778 | swap(keys->addrs.v6addrs.src.s6_addr32[i], | |
1779 | keys->addrs.v6addrs.dst.s6_addr32[i]); | |
1e60cebf | 1780 | } |
1781 | if ((__force u16)keys->ports.dst < | |
1782 | (__force u16)keys->ports.src) { | |
c3f83241 TH |
1783 | swap(keys->ports.src, keys->ports.dst); |
1784 | } | |
1785 | break; | |
1786 | } | |
66415cf8 HFS |
1787 | } |
1788 | ||
55667441 ED |
1789 | static inline u32 __flow_hash_from_keys(struct flow_keys *keys, |
1790 | const siphash_key_t *keyval) | |
5ed20a68 TH |
1791 | { |
1792 | u32 hash; | |
1793 | ||
c3f83241 | 1794 | __flow_hash_consistentify(keys); |
5ed20a68 | 1795 | |
55667441 ED |
1796 | hash = siphash(flow_keys_hash_start(keys), |
1797 | flow_keys_hash_length(keys), keyval); | |
5ed20a68 TH |
1798 | if (!hash) |
1799 | hash = 1; | |
1800 | ||
1801 | return hash; | |
1802 | } | |
1803 | ||
1804 | u32 flow_hash_from_keys(struct flow_keys *keys) | |
1805 | { | |
50fb7992 | 1806 | __flow_hash_secret_init(); |
55667441 | 1807 | return __flow_hash_from_keys(keys, &hashrnd); |
5ed20a68 TH |
1808 | } |
1809 | EXPORT_SYMBOL(flow_hash_from_keys); | |
1810 | ||
4ee2a8ca PM |
1811 | u32 flow_hash_from_keys_seed(struct flow_keys *keys, |
1812 | const siphash_key_t *keyval) | |
1813 | { | |
1814 | return __flow_hash_from_keys(keys, keyval); | |
1815 | } | |
1816 | EXPORT_SYMBOL(flow_hash_from_keys_seed); | |
1817 | ||
50fb7992 | 1818 | static inline u32 ___skb_get_hash(const struct sk_buff *skb, |
55667441 ED |
1819 | struct flow_keys *keys, |
1820 | const siphash_key_t *keyval) | |
50fb7992 | 1821 | { |
6db61d79 TH |
1822 | skb_flow_dissect_flow_keys(skb, keys, |
1823 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
50fb7992 TH |
1824 | |
1825 | return __flow_hash_from_keys(keys, keyval); | |
1826 | } | |
1827 | ||
2f59e1eb TH |
1828 | struct _flow_keys_digest_data { |
1829 | __be16 n_proto; | |
1830 | u8 ip_proto; | |
1831 | u8 padding; | |
1832 | __be32 ports; | |
1833 | __be32 src; | |
1834 | __be32 dst; | |
1835 | }; | |
1836 | ||
1837 | void make_flow_keys_digest(struct flow_keys_digest *digest, | |
1838 | const struct flow_keys *flow) | |
1839 | { | |
1840 | struct _flow_keys_digest_data *data = | |
1841 | (struct _flow_keys_digest_data *)digest; | |
1842 | ||
1843 | BUILD_BUG_ON(sizeof(*data) > sizeof(*digest)); | |
1844 | ||
1845 | memset(digest, 0, sizeof(*digest)); | |
1846 | ||
06635a35 JP |
1847 | data->n_proto = flow->basic.n_proto; |
1848 | data->ip_proto = flow->basic.ip_proto; | |
1849 | data->ports = flow->ports.ports; | |
c3f83241 TH |
1850 | data->src = flow->addrs.v4addrs.src; |
1851 | data->dst = flow->addrs.v4addrs.dst; | |
2f59e1eb TH |
1852 | } |
1853 | EXPORT_SYMBOL(make_flow_keys_digest); | |
1854 | ||
eb70db87 DM |
1855 | static struct flow_dissector flow_keys_dissector_symmetric __read_mostly; |
1856 | ||
d1dab4f7 | 1857 | u32 __skb_get_hash_symmetric_net(const struct net *net, const struct sk_buff *skb) |
eb70db87 DM |
1858 | { |
1859 | struct flow_keys keys; | |
1860 | ||
1861 | __flow_hash_secret_init(); | |
1862 | ||
1863 | memset(&keys, 0, sizeof(keys)); | |
d1dab4f7 | 1864 | __skb_flow_dissect(net, skb, &flow_keys_dissector_symmetric, |
a5e2151f | 1865 | &keys, NULL, 0, 0, 0, 0); |
eb70db87 | 1866 | |
55667441 | 1867 | return __flow_hash_from_keys(&keys, &hashrnd); |
eb70db87 | 1868 | } |
d1dab4f7 | 1869 | EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric_net); |
eb70db87 | 1870 | |
d4fd3275 | 1871 | /** |
b975d3ee FW |
1872 | * __skb_get_hash_net: calculate a flow hash |
1873 | * @net: associated network namespace, derived from @skb if NULL | |
d4fd3275 JP |
1874 | * @skb: sk_buff to calculate flow hash from |
1875 | * | |
1876 | * This function calculates a flow hash based on src/dst addresses | |
61b905da TH |
1877 | * and src/dst port numbers. Sets hash in skb to non-zero hash value |
1878 | * on success, zero indicates no valid hash. Also, sets l4_hash in skb | |
441d9d32 CW |
1879 | * if hash is a canonical 4-tuple hash over transport ports. |
1880 | */ | |
b975d3ee | 1881 | void __skb_get_hash_net(const struct net *net, struct sk_buff *skb) |
441d9d32 CW |
1882 | { |
1883 | struct flow_keys keys; | |
635c223c | 1884 | u32 hash; |
441d9d32 | 1885 | |
b975d3ee FW |
1886 | memset(&keys, 0, sizeof(keys)); |
1887 | ||
1888 | __skb_flow_dissect(net, skb, &flow_keys_dissector, | |
1889 | &keys, NULL, 0, 0, 0, | |
1890 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
1891 | ||
50fb7992 TH |
1892 | __flow_hash_secret_init(); |
1893 | ||
b975d3ee | 1894 | hash = __flow_hash_from_keys(&keys, &hashrnd); |
635c223c GF |
1895 | |
1896 | __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys)); | |
441d9d32 | 1897 | } |
b975d3ee | 1898 | EXPORT_SYMBOL(__skb_get_hash_net); |
441d9d32 | 1899 | |
55667441 ED |
1900 | __u32 skb_get_hash_perturb(const struct sk_buff *skb, |
1901 | const siphash_key_t *perturb) | |
50fb7992 TH |
1902 | { |
1903 | struct flow_keys keys; | |
1904 | ||
1905 | return ___skb_get_hash(skb, &keys, perturb); | |
1906 | } | |
1907 | EXPORT_SYMBOL(skb_get_hash_perturb); | |
1908 | ||
f96533cd | 1909 | u32 __skb_get_poff(const struct sk_buff *skb, const void *data, |
72a338bc | 1910 | const struct flow_keys_basic *keys, int hlen) |
f77668dc | 1911 | { |
42aecaa9 | 1912 | u32 poff = keys->control.thoff; |
f77668dc | 1913 | |
43d2ccb3 AD |
1914 | /* skip L4 headers for fragments after the first */ |
1915 | if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) && | |
1916 | !(keys->control.flags & FLOW_DIS_FIRST_FRAG)) | |
1917 | return poff; | |
1918 | ||
06635a35 | 1919 | switch (keys->basic.ip_proto) { |
f77668dc | 1920 | case IPPROTO_TCP: { |
5af7fb6e AD |
1921 | /* access doff as u8 to avoid unaligned access */ |
1922 | const u8 *doff; | |
1923 | u8 _doff; | |
f77668dc | 1924 | |
5af7fb6e AD |
1925 | doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff), |
1926 | data, hlen, &_doff); | |
1927 | if (!doff) | |
f77668dc DB |
1928 | return poff; |
1929 | ||
5af7fb6e | 1930 | poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2); |
f77668dc DB |
1931 | break; |
1932 | } | |
1933 | case IPPROTO_UDP: | |
1934 | case IPPROTO_UDPLITE: | |
1935 | poff += sizeof(struct udphdr); | |
1936 | break; | |
1937 | /* For the rest, we do not really care about header | |
1938 | * extensions at this point for now. | |
1939 | */ | |
1940 | case IPPROTO_ICMP: | |
1941 | poff += sizeof(struct icmphdr); | |
1942 | break; | |
1943 | case IPPROTO_ICMPV6: | |
1944 | poff += sizeof(struct icmp6hdr); | |
1945 | break; | |
1946 | case IPPROTO_IGMP: | |
1947 | poff += sizeof(struct igmphdr); | |
1948 | break; | |
1949 | case IPPROTO_DCCP: | |
1950 | poff += sizeof(struct dccp_hdr); | |
1951 | break; | |
1952 | case IPPROTO_SCTP: | |
1953 | poff += sizeof(struct sctphdr); | |
1954 | break; | |
1955 | } | |
1956 | ||
1957 | return poff; | |
1958 | } | |
1959 | ||
0db89b8b JP |
1960 | /** |
1961 | * skb_get_poff - get the offset to the payload | |
1962 | * @skb: sk_buff to get the payload offset from | |
1963 | * | |
1964 | * The function will get the offset to the payload as far as it could | |
1965 | * be dissected. The main user is currently BPF, so that we can dynamically | |
56193d1b AD |
1966 | * truncate packets without needing to push actual payload to the user |
1967 | * space and can analyze headers only, instead. | |
1968 | */ | |
1969 | u32 skb_get_poff(const struct sk_buff *skb) | |
1970 | { | |
72a338bc | 1971 | struct flow_keys_basic keys; |
56193d1b | 1972 | |
3cbf4ffb SF |
1973 | if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys, |
1974 | NULL, 0, 0, 0, 0)) | |
56193d1b AD |
1975 | return 0; |
1976 | ||
1977 | return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb)); | |
1978 | } | |
06635a35 | 1979 | |
20a17bf6 | 1980 | __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys) |
a17ace95 DM |
1981 | { |
1982 | memset(keys, 0, sizeof(*keys)); | |
1983 | ||
1984 | memcpy(&keys->addrs.v6addrs.src, &fl6->saddr, | |
1985 | sizeof(keys->addrs.v6addrs.src)); | |
1986 | memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr, | |
1987 | sizeof(keys->addrs.v6addrs.dst)); | |
1988 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
1989 | keys->ports.src = fl6->fl6_sport; | |
1990 | keys->ports.dst = fl6->fl6_dport; | |
1991 | keys->keyid.keyid = fl6->fl6_gre_key; | |
fa1be7e0 | 1992 | keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
a17ace95 DM |
1993 | keys->basic.ip_proto = fl6->flowi6_proto; |
1994 | ||
1995 | return flow_hash_from_keys(keys); | |
1996 | } | |
1997 | EXPORT_SYMBOL(__get_hash_from_flowi6); | |
1998 | ||
06635a35 | 1999 | static const struct flow_dissector_key flow_keys_dissector_keys[] = { |
42aecaa9 TH |
2000 | { |
2001 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
2002 | .offset = offsetof(struct flow_keys, control), | |
2003 | }, | |
06635a35 JP |
2004 | { |
2005 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
2006 | .offset = offsetof(struct flow_keys, basic), | |
2007 | }, | |
2008 | { | |
2009 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
c3f83241 TH |
2010 | .offset = offsetof(struct flow_keys, addrs.v4addrs), |
2011 | }, | |
2012 | { | |
2013 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
2014 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
06635a35 | 2015 | }, |
9f249089 | 2016 | { |
8d6e79d3 JM |
2017 | .key_id = FLOW_DISSECTOR_KEY_TIPC, |
2018 | .offset = offsetof(struct flow_keys, addrs.tipckey), | |
9f249089 | 2019 | }, |
06635a35 JP |
2020 | { |
2021 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
2022 | .offset = offsetof(struct flow_keys, ports), | |
2023 | }, | |
d34af823 | 2024 | { |
f6a66927 HHZ |
2025 | .key_id = FLOW_DISSECTOR_KEY_VLAN, |
2026 | .offset = offsetof(struct flow_keys, vlan), | |
d34af823 | 2027 | }, |
87ee9e52 TH |
2028 | { |
2029 | .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
2030 | .offset = offsetof(struct flow_keys, tags), | |
2031 | }, | |
1fdd512c TH |
2032 | { |
2033 | .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, | |
2034 | .offset = offsetof(struct flow_keys, keyid), | |
2035 | }, | |
06635a35 JP |
2036 | }; |
2037 | ||
eb70db87 DM |
2038 | static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = { |
2039 | { | |
2040 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
2041 | .offset = offsetof(struct flow_keys, control), | |
2042 | }, | |
2043 | { | |
2044 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
2045 | .offset = offsetof(struct flow_keys, basic), | |
2046 | }, | |
2047 | { | |
2048 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
2049 | .offset = offsetof(struct flow_keys, addrs.v4addrs), | |
2050 | }, | |
2051 | { | |
2052 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
2053 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
2054 | }, | |
2055 | { | |
2056 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
2057 | .offset = offsetof(struct flow_keys, ports), | |
2058 | }, | |
2059 | }; | |
2060 | ||
72a338bc | 2061 | static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = { |
42aecaa9 TH |
2062 | { |
2063 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
2064 | .offset = offsetof(struct flow_keys, control), | |
2065 | }, | |
06635a35 JP |
2066 | { |
2067 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
2068 | .offset = offsetof(struct flow_keys, basic), | |
2069 | }, | |
2070 | }; | |
2071 | ||
2072 | struct flow_dissector flow_keys_dissector __read_mostly; | |
2073 | EXPORT_SYMBOL(flow_keys_dissector); | |
2074 | ||
72a338bc PA |
2075 | struct flow_dissector flow_keys_basic_dissector __read_mostly; |
2076 | EXPORT_SYMBOL(flow_keys_basic_dissector); | |
06635a35 JP |
2077 | |
2078 | static int __init init_default_flow_dissectors(void) | |
2079 | { | |
2080 | skb_flow_dissector_init(&flow_keys_dissector, | |
2081 | flow_keys_dissector_keys, | |
2082 | ARRAY_SIZE(flow_keys_dissector_keys)); | |
eb70db87 DM |
2083 | skb_flow_dissector_init(&flow_keys_dissector_symmetric, |
2084 | flow_keys_dissector_symmetric_keys, | |
2085 | ARRAY_SIZE(flow_keys_dissector_symmetric_keys)); | |
72a338bc PA |
2086 | skb_flow_dissector_init(&flow_keys_basic_dissector, |
2087 | flow_keys_basic_dissector_keys, | |
2088 | ARRAY_SIZE(flow_keys_basic_dissector_keys)); | |
b27f7bb5 | 2089 | return 0; |
5cf65922 | 2090 | } |
c9b8af13 | 2091 | core_initcall(init_default_flow_dissectors); |