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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> | |
43e66528 | 8 | #include <net/dsa.h> |
a38402bc | 9 | #include <net/dst_metadata.h> |
0744dd00 | 10 | #include <net/ip.h> |
ddbe5032 | 11 | #include <net/ipv6.h> |
ab10dccb GF |
12 | #include <net/gre.h> |
13 | #include <net/pptp.h> | |
8d6e79d3 | 14 | #include <net/tipc.h> |
f77668dc DB |
15 | #include <linux/igmp.h> |
16 | #include <linux/icmp.h> | |
17 | #include <linux/sctp.h> | |
18 | #include <linux/dccp.h> | |
0744dd00 ED |
19 | #include <linux/if_tunnel.h> |
20 | #include <linux/if_pppox.h> | |
21 | #include <linux/ppp_defs.h> | |
06635a35 | 22 | #include <linux/stddef.h> |
67a900cc | 23 | #include <linux/if_ether.h> |
b3baa0fb | 24 | #include <linux/mpls.h> |
ac4bb5de | 25 | #include <linux/tcp.h> |
1bd758eb | 26 | #include <net/flow_dissector.h> |
56193d1b | 27 | #include <scsi/fc/fc_fcoe.h> |
5b0890a9 | 28 | #include <uapi/linux/batadv_packet.h> |
d58e468b | 29 | #include <linux/bpf.h> |
75a56758 PB |
30 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
31 | #include <net/netfilter/nf_conntrack_core.h> | |
32 | #include <net/netfilter/nf_conntrack_labels.h> | |
33 | #endif | |
d58e468b PP |
34 | |
35 | static DEFINE_MUTEX(flow_dissector_mutex); | |
0744dd00 | 36 | |
20a17bf6 DM |
37 | static void dissector_set_key(struct flow_dissector *flow_dissector, |
38 | enum flow_dissector_key_id key_id) | |
fbff949e JP |
39 | { |
40 | flow_dissector->used_keys |= (1 << key_id); | |
41 | } | |
42 | ||
fbff949e JP |
43 | void skb_flow_dissector_init(struct flow_dissector *flow_dissector, |
44 | const struct flow_dissector_key *key, | |
45 | unsigned int key_count) | |
46 | { | |
47 | unsigned int i; | |
48 | ||
49 | memset(flow_dissector, 0, sizeof(*flow_dissector)); | |
50 | ||
51 | for (i = 0; i < key_count; i++, key++) { | |
52 | /* User should make sure that every key target offset is withing | |
53 | * boundaries of unsigned short. | |
54 | */ | |
55 | BUG_ON(key->offset > USHRT_MAX); | |
20a17bf6 DM |
56 | BUG_ON(dissector_uses_key(flow_dissector, |
57 | key->key_id)); | |
fbff949e | 58 | |
20a17bf6 | 59 | dissector_set_key(flow_dissector, key->key_id); |
fbff949e JP |
60 | flow_dissector->offset[key->key_id] = key->offset; |
61 | } | |
62 | ||
42aecaa9 TH |
63 | /* Ensure that the dissector always includes control and basic key. |
64 | * That way we are able to avoid handling lack of these in fast path. | |
fbff949e | 65 | */ |
20a17bf6 DM |
66 | BUG_ON(!dissector_uses_key(flow_dissector, |
67 | FLOW_DISSECTOR_KEY_CONTROL)); | |
68 | BUG_ON(!dissector_uses_key(flow_dissector, | |
69 | FLOW_DISSECTOR_KEY_BASIC)); | |
fbff949e JP |
70 | } |
71 | EXPORT_SYMBOL(skb_flow_dissector_init); | |
72 | ||
118c8e9a SF |
73 | int skb_flow_dissector_prog_query(const union bpf_attr *attr, |
74 | union bpf_attr __user *uattr) | |
75 | { | |
76 | __u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids); | |
77 | u32 prog_id, prog_cnt = 0, flags = 0; | |
78 | struct bpf_prog *attached; | |
79 | struct net *net; | |
80 | ||
81 | if (attr->query.query_flags) | |
82 | return -EINVAL; | |
83 | ||
84 | net = get_net_ns_by_fd(attr->query.target_fd); | |
85 | if (IS_ERR(net)) | |
86 | return PTR_ERR(net); | |
87 | ||
88 | rcu_read_lock(); | |
89 | attached = rcu_dereference(net->flow_dissector_prog); | |
90 | if (attached) { | |
91 | prog_cnt = 1; | |
92 | prog_id = attached->aux->id; | |
93 | } | |
94 | rcu_read_unlock(); | |
95 | ||
96 | put_net(net); | |
97 | ||
98 | if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags))) | |
99 | return -EFAULT; | |
100 | if (copy_to_user(&uattr->query.prog_cnt, &prog_cnt, sizeof(prog_cnt))) | |
101 | return -EFAULT; | |
102 | ||
103 | if (!attr->query.prog_cnt || !prog_ids || !prog_cnt) | |
104 | return 0; | |
105 | ||
106 | if (copy_to_user(prog_ids, &prog_id, sizeof(u32))) | |
107 | return -EFAULT; | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
d58e468b PP |
112 | int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr, |
113 | struct bpf_prog *prog) | |
114 | { | |
115 | struct bpf_prog *attached; | |
116 | struct net *net; | |
a11c397c | 117 | int ret = 0; |
d58e468b PP |
118 | |
119 | net = current->nsproxy->net_ns; | |
120 | mutex_lock(&flow_dissector_mutex); | |
a11c397c SF |
121 | |
122 | if (net == &init_net) { | |
123 | /* BPF flow dissector in the root namespace overrides | |
124 | * any per-net-namespace one. When attaching to root, | |
125 | * make sure we don't have any BPF program attached | |
126 | * to the non-root namespaces. | |
127 | */ | |
128 | struct net *ns; | |
129 | ||
130 | for_each_net(ns) { | |
719b78a5 JS |
131 | if (ns == &init_net) |
132 | continue; | |
a11c397c SF |
133 | if (rcu_access_pointer(ns->flow_dissector_prog)) { |
134 | ret = -EEXIST; | |
135 | goto out; | |
136 | } | |
137 | } | |
138 | } else { | |
139 | /* Make sure root flow dissector is not attached | |
140 | * when attaching to the non-root namespace. | |
141 | */ | |
142 | if (rcu_access_pointer(init_net.flow_dissector_prog)) { | |
143 | ret = -EEXIST; | |
144 | goto out; | |
145 | } | |
146 | } | |
147 | ||
d58e468b PP |
148 | attached = rcu_dereference_protected(net->flow_dissector_prog, |
149 | lockdep_is_held(&flow_dissector_mutex)); | |
719b78a5 JS |
150 | if (attached == prog) { |
151 | /* The same program cannot be attached twice */ | |
152 | ret = -EINVAL; | |
a11c397c | 153 | goto out; |
d58e468b PP |
154 | } |
155 | rcu_assign_pointer(net->flow_dissector_prog, prog); | |
719b78a5 JS |
156 | if (attached) |
157 | bpf_prog_put(attached); | |
a11c397c | 158 | out: |
d58e468b | 159 | mutex_unlock(&flow_dissector_mutex); |
a11c397c | 160 | return ret; |
d58e468b PP |
161 | } |
162 | ||
163 | int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr) | |
164 | { | |
165 | struct bpf_prog *attached; | |
166 | struct net *net; | |
167 | ||
168 | net = current->nsproxy->net_ns; | |
169 | mutex_lock(&flow_dissector_mutex); | |
170 | attached = rcu_dereference_protected(net->flow_dissector_prog, | |
171 | lockdep_is_held(&flow_dissector_mutex)); | |
172 | if (!attached) { | |
173 | mutex_unlock(&flow_dissector_mutex); | |
174 | return -ENOENT; | |
175 | } | |
d58e468b | 176 | RCU_INIT_POINTER(net->flow_dissector_prog, NULL); |
db38de39 | 177 | bpf_prog_put(attached); |
d58e468b PP |
178 | mutex_unlock(&flow_dissector_mutex); |
179 | return 0; | |
180 | } | |
972d3876 | 181 | |
357afe9c | 182 | /** |
6451b3f5 WC |
183 | * __skb_flow_get_ports - extract the upper layer ports and return them |
184 | * @skb: sk_buff to extract the ports from | |
357afe9c NA |
185 | * @thoff: transport header offset |
186 | * @ip_proto: protocol for which to get port offset | |
6451b3f5 WC |
187 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
188 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
357afe9c NA |
189 | * |
190 | * The function will try to retrieve the ports at offset thoff + poff where poff | |
191 | * is the protocol port offset returned from proto_ports_offset | |
192 | */ | |
690e36e7 DM |
193 | __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, |
194 | void *data, int hlen) | |
357afe9c NA |
195 | { |
196 | int poff = proto_ports_offset(ip_proto); | |
197 | ||
690e36e7 DM |
198 | if (!data) { |
199 | data = skb->data; | |
200 | hlen = skb_headlen(skb); | |
201 | } | |
202 | ||
357afe9c NA |
203 | if (poff >= 0) { |
204 | __be32 *ports, _ports; | |
205 | ||
690e36e7 DM |
206 | ports = __skb_header_pointer(skb, thoff + poff, |
207 | sizeof(_ports), data, hlen, &_ports); | |
357afe9c NA |
208 | if (ports) |
209 | return *ports; | |
210 | } | |
211 | ||
212 | return 0; | |
213 | } | |
690e36e7 | 214 | EXPORT_SYMBOL(__skb_flow_get_ports); |
357afe9c | 215 | |
5dec597e MC |
216 | static bool icmp_has_id(u8 type) |
217 | { | |
218 | switch (type) { | |
219 | case ICMP_ECHO: | |
220 | case ICMP_ECHOREPLY: | |
221 | case ICMP_TIMESTAMP: | |
222 | case ICMP_TIMESTAMPREPLY: | |
223 | case ICMPV6_ECHO_REQUEST: | |
224 | case ICMPV6_ECHO_REPLY: | |
225 | return true; | |
226 | } | |
227 | ||
228 | return false; | |
229 | } | |
230 | ||
231 | /** | |
232 | * skb_flow_get_icmp_tci - extract ICMP(6) Type, Code and Identifier fields | |
233 | * @skb: sk_buff to extract from | |
234 | * @key_icmp: struct flow_dissector_key_icmp to fill | |
235 | * @data: raw buffer pointer to the packet | |
236 | * @toff: offset to extract at | |
237 | * @hlen: packet header length | |
238 | */ | |
239 | void skb_flow_get_icmp_tci(const struct sk_buff *skb, | |
240 | struct flow_dissector_key_icmp *key_icmp, | |
241 | void *data, int thoff, int hlen) | |
242 | { | |
243 | struct icmphdr *ih, _ih; | |
244 | ||
245 | ih = __skb_header_pointer(skb, thoff, sizeof(_ih), data, hlen, &_ih); | |
246 | if (!ih) | |
247 | return; | |
248 | ||
249 | key_icmp->type = ih->type; | |
250 | key_icmp->code = ih->code; | |
251 | ||
252 | /* As we use 0 to signal that the Id field is not present, | |
253 | * avoid confusion with packets without such field | |
254 | */ | |
255 | if (icmp_has_id(ih->type)) | |
256 | key_icmp->id = ih->un.echo.id ? : 1; | |
257 | else | |
258 | key_icmp->id = 0; | |
259 | } | |
260 | EXPORT_SYMBOL(skb_flow_get_icmp_tci); | |
261 | ||
262 | /* If FLOW_DISSECTOR_KEY_ICMP is set, dissect an ICMP packet | |
263 | * using skb_flow_get_icmp_tci(). | |
3b336d6f MC |
264 | */ |
265 | static void __skb_flow_dissect_icmp(const struct sk_buff *skb, | |
266 | struct flow_dissector *flow_dissector, | |
267 | void *target_container, | |
268 | void *data, int thoff, int hlen) | |
269 | { | |
270 | struct flow_dissector_key_icmp *key_icmp; | |
271 | ||
272 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP)) | |
273 | return; | |
274 | ||
275 | key_icmp = skb_flow_dissector_target(flow_dissector, | |
276 | FLOW_DISSECTOR_KEY_ICMP, | |
277 | target_container); | |
5dec597e MC |
278 | |
279 | skb_flow_get_icmp_tci(skb, key_icmp, data, thoff, hlen); | |
3b336d6f MC |
280 | } |
281 | ||
82828b88 JP |
282 | void skb_flow_dissect_meta(const struct sk_buff *skb, |
283 | struct flow_dissector *flow_dissector, | |
284 | void *target_container) | |
285 | { | |
286 | struct flow_dissector_key_meta *meta; | |
287 | ||
288 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META)) | |
289 | return; | |
290 | ||
291 | meta = skb_flow_dissector_target(flow_dissector, | |
292 | FLOW_DISSECTOR_KEY_META, | |
293 | target_container); | |
294 | meta->ingress_ifindex = skb->skb_iif; | |
295 | } | |
296 | EXPORT_SYMBOL(skb_flow_dissect_meta); | |
297 | ||
a38402bc SH |
298 | static void |
299 | skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type, | |
300 | struct flow_dissector *flow_dissector, | |
301 | void *target_container) | |
302 | { | |
303 | struct flow_dissector_key_control *ctrl; | |
304 | ||
305 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL)) | |
306 | return; | |
307 | ||
308 | ctrl = skb_flow_dissector_target(flow_dissector, | |
309 | FLOW_DISSECTOR_KEY_ENC_CONTROL, | |
310 | target_container); | |
311 | ctrl->addr_type = type; | |
312 | } | |
313 | ||
75a56758 PB |
314 | void |
315 | skb_flow_dissect_ct(const struct sk_buff *skb, | |
316 | struct flow_dissector *flow_dissector, | |
317 | void *target_container, | |
318 | u16 *ctinfo_map, | |
319 | size_t mapsize) | |
320 | { | |
321 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) | |
322 | struct flow_dissector_key_ct *key; | |
323 | enum ip_conntrack_info ctinfo; | |
324 | struct nf_conn_labels *cl; | |
325 | struct nf_conn *ct; | |
326 | ||
327 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT)) | |
328 | return; | |
329 | ||
330 | ct = nf_ct_get(skb, &ctinfo); | |
331 | if (!ct) | |
332 | return; | |
333 | ||
334 | key = skb_flow_dissector_target(flow_dissector, | |
335 | FLOW_DISSECTOR_KEY_CT, | |
336 | target_container); | |
337 | ||
338 | if (ctinfo < mapsize) | |
339 | key->ct_state = ctinfo_map[ctinfo]; | |
340 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) | |
341 | key->ct_zone = ct->zone.id; | |
342 | #endif | |
343 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) | |
344 | key->ct_mark = ct->mark; | |
345 | #endif | |
346 | ||
347 | cl = nf_ct_labels_find(ct); | |
348 | if (cl) | |
349 | memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels)); | |
350 | #endif /* CONFIG_NF_CONNTRACK */ | |
351 | } | |
352 | EXPORT_SYMBOL(skb_flow_dissect_ct); | |
353 | ||
62b32379 SH |
354 | void |
355 | skb_flow_dissect_tunnel_info(const struct sk_buff *skb, | |
356 | struct flow_dissector *flow_dissector, | |
357 | void *target_container) | |
a38402bc SH |
358 | { |
359 | struct ip_tunnel_info *info; | |
360 | struct ip_tunnel_key *key; | |
361 | ||
362 | /* A quick check to see if there might be something to do. */ | |
363 | if (!dissector_uses_key(flow_dissector, | |
364 | FLOW_DISSECTOR_KEY_ENC_KEYID) && | |
365 | !dissector_uses_key(flow_dissector, | |
366 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) && | |
367 | !dissector_uses_key(flow_dissector, | |
368 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) && | |
369 | !dissector_uses_key(flow_dissector, | |
370 | FLOW_DISSECTOR_KEY_ENC_CONTROL) && | |
371 | !dissector_uses_key(flow_dissector, | |
5544adb9 OG |
372 | FLOW_DISSECTOR_KEY_ENC_PORTS) && |
373 | !dissector_uses_key(flow_dissector, | |
92e2c405 SH |
374 | FLOW_DISSECTOR_KEY_ENC_IP) && |
375 | !dissector_uses_key(flow_dissector, | |
376 | FLOW_DISSECTOR_KEY_ENC_OPTS)) | |
a38402bc SH |
377 | return; |
378 | ||
379 | info = skb_tunnel_info(skb); | |
380 | if (!info) | |
381 | return; | |
382 | ||
383 | key = &info->key; | |
384 | ||
385 | switch (ip_tunnel_info_af(info)) { | |
386 | case AF_INET: | |
387 | skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
388 | flow_dissector, | |
389 | target_container); | |
390 | if (dissector_uses_key(flow_dissector, | |
391 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) { | |
392 | struct flow_dissector_key_ipv4_addrs *ipv4; | |
393 | ||
394 | ipv4 = skb_flow_dissector_target(flow_dissector, | |
395 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, | |
396 | target_container); | |
397 | ipv4->src = key->u.ipv4.src; | |
398 | ipv4->dst = key->u.ipv4.dst; | |
399 | } | |
400 | break; | |
401 | case AF_INET6: | |
402 | skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
403 | flow_dissector, | |
404 | target_container); | |
405 | if (dissector_uses_key(flow_dissector, | |
406 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) { | |
407 | struct flow_dissector_key_ipv6_addrs *ipv6; | |
408 | ||
409 | ipv6 = skb_flow_dissector_target(flow_dissector, | |
410 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, | |
411 | target_container); | |
412 | ipv6->src = key->u.ipv6.src; | |
413 | ipv6->dst = key->u.ipv6.dst; | |
414 | } | |
415 | break; | |
416 | } | |
417 | ||
418 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) { | |
419 | struct flow_dissector_key_keyid *keyid; | |
420 | ||
421 | keyid = skb_flow_dissector_target(flow_dissector, | |
422 | FLOW_DISSECTOR_KEY_ENC_KEYID, | |
423 | target_container); | |
424 | keyid->keyid = tunnel_id_to_key32(key->tun_id); | |
425 | } | |
426 | ||
427 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) { | |
428 | struct flow_dissector_key_ports *tp; | |
429 | ||
430 | tp = skb_flow_dissector_target(flow_dissector, | |
431 | FLOW_DISSECTOR_KEY_ENC_PORTS, | |
432 | target_container); | |
433 | tp->src = key->tp_src; | |
434 | tp->dst = key->tp_dst; | |
435 | } | |
5544adb9 OG |
436 | |
437 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) { | |
438 | struct flow_dissector_key_ip *ip; | |
439 | ||
440 | ip = skb_flow_dissector_target(flow_dissector, | |
441 | FLOW_DISSECTOR_KEY_ENC_IP, | |
442 | target_container); | |
443 | ip->tos = key->tos; | |
444 | ip->ttl = key->ttl; | |
445 | } | |
92e2c405 SH |
446 | |
447 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) { | |
448 | struct flow_dissector_key_enc_opts *enc_opt; | |
449 | ||
450 | enc_opt = skb_flow_dissector_target(flow_dissector, | |
451 | FLOW_DISSECTOR_KEY_ENC_OPTS, | |
452 | target_container); | |
453 | ||
454 | if (info->options_len) { | |
455 | enc_opt->len = info->options_len; | |
456 | ip_tunnel_info_opts_get(enc_opt->data, info); | |
457 | enc_opt->dst_opt_type = info->key.tun_flags & | |
458 | TUNNEL_OPTIONS_PRESENT; | |
459 | } | |
460 | } | |
a38402bc | 461 | } |
62b32379 | 462 | EXPORT_SYMBOL(skb_flow_dissect_tunnel_info); |
a38402bc | 463 | |
4a5d6c8b JP |
464 | static enum flow_dissect_ret |
465 | __skb_flow_dissect_mpls(const struct sk_buff *skb, | |
466 | struct flow_dissector *flow_dissector, | |
467 | void *target_container, void *data, int nhoff, int hlen) | |
468 | { | |
469 | struct flow_dissector_key_keyid *key_keyid; | |
470 | struct mpls_label *hdr, _hdr[2]; | |
029c1ecb | 471 | u32 entry, label; |
4a5d6c8b JP |
472 | |
473 | if (!dissector_uses_key(flow_dissector, | |
029c1ecb BL |
474 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY) && |
475 | !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) | |
4a5d6c8b JP |
476 | return FLOW_DISSECT_RET_OUT_GOOD; |
477 | ||
478 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, | |
479 | hlen, &_hdr); | |
480 | if (!hdr) | |
481 | return FLOW_DISSECT_RET_OUT_BAD; | |
482 | ||
029c1ecb BL |
483 | entry = ntohl(hdr[0].entry); |
484 | label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT; | |
485 | ||
486 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) { | |
487 | struct flow_dissector_key_mpls *key_mpls; | |
488 | ||
489 | key_mpls = skb_flow_dissector_target(flow_dissector, | |
490 | FLOW_DISSECTOR_KEY_MPLS, | |
491 | target_container); | |
492 | key_mpls->mpls_label = label; | |
493 | key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK) | |
494 | >> MPLS_LS_TTL_SHIFT; | |
495 | key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK) | |
496 | >> MPLS_LS_TC_SHIFT; | |
497 | key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK) | |
498 | >> MPLS_LS_S_SHIFT; | |
499 | } | |
500 | ||
501 | if (label == MPLS_LABEL_ENTROPY) { | |
4a5d6c8b JP |
502 | key_keyid = skb_flow_dissector_target(flow_dissector, |
503 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY, | |
504 | target_container); | |
505 | key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK); | |
506 | } | |
507 | return FLOW_DISSECT_RET_OUT_GOOD; | |
508 | } | |
509 | ||
9bf881ff JP |
510 | static enum flow_dissect_ret |
511 | __skb_flow_dissect_arp(const struct sk_buff *skb, | |
512 | struct flow_dissector *flow_dissector, | |
513 | void *target_container, void *data, int nhoff, int hlen) | |
514 | { | |
515 | struct flow_dissector_key_arp *key_arp; | |
516 | struct { | |
517 | unsigned char ar_sha[ETH_ALEN]; | |
518 | unsigned char ar_sip[4]; | |
519 | unsigned char ar_tha[ETH_ALEN]; | |
520 | unsigned char ar_tip[4]; | |
521 | } *arp_eth, _arp_eth; | |
522 | const struct arphdr *arp; | |
6f14f443 | 523 | struct arphdr _arp; |
9bf881ff JP |
524 | |
525 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP)) | |
526 | return FLOW_DISSECT_RET_OUT_GOOD; | |
527 | ||
528 | arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data, | |
529 | hlen, &_arp); | |
530 | if (!arp) | |
531 | return FLOW_DISSECT_RET_OUT_BAD; | |
532 | ||
533 | if (arp->ar_hrd != htons(ARPHRD_ETHER) || | |
534 | arp->ar_pro != htons(ETH_P_IP) || | |
535 | arp->ar_hln != ETH_ALEN || | |
536 | arp->ar_pln != 4 || | |
537 | (arp->ar_op != htons(ARPOP_REPLY) && | |
538 | arp->ar_op != htons(ARPOP_REQUEST))) | |
539 | return FLOW_DISSECT_RET_OUT_BAD; | |
540 | ||
541 | arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp), | |
542 | sizeof(_arp_eth), data, | |
543 | hlen, &_arp_eth); | |
544 | if (!arp_eth) | |
545 | return FLOW_DISSECT_RET_OUT_BAD; | |
546 | ||
547 | key_arp = skb_flow_dissector_target(flow_dissector, | |
548 | FLOW_DISSECTOR_KEY_ARP, | |
549 | target_container); | |
550 | ||
551 | memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip)); | |
552 | memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip)); | |
553 | ||
554 | /* Only store the lower byte of the opcode; | |
555 | * this covers ARPOP_REPLY and ARPOP_REQUEST. | |
556 | */ | |
557 | key_arp->op = ntohs(arp->ar_op) & 0xff; | |
558 | ||
559 | ether_addr_copy(key_arp->sha, arp_eth->ar_sha); | |
560 | ether_addr_copy(key_arp->tha, arp_eth->ar_tha); | |
561 | ||
562 | return FLOW_DISSECT_RET_OUT_GOOD; | |
563 | } | |
564 | ||
7c92de8e JP |
565 | static enum flow_dissect_ret |
566 | __skb_flow_dissect_gre(const struct sk_buff *skb, | |
567 | struct flow_dissector_key_control *key_control, | |
568 | struct flow_dissector *flow_dissector, | |
569 | void *target_container, void *data, | |
570 | __be16 *p_proto, int *p_nhoff, int *p_hlen, | |
571 | unsigned int flags) | |
572 | { | |
573 | struct flow_dissector_key_keyid *key_keyid; | |
574 | struct gre_base_hdr *hdr, _hdr; | |
575 | int offset = 0; | |
576 | u16 gre_ver; | |
577 | ||
578 | hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), | |
579 | data, *p_hlen, &_hdr); | |
580 | if (!hdr) | |
581 | return FLOW_DISSECT_RET_OUT_BAD; | |
582 | ||
583 | /* Only look inside GRE without routing */ | |
584 | if (hdr->flags & GRE_ROUTING) | |
585 | return FLOW_DISSECT_RET_OUT_GOOD; | |
586 | ||
587 | /* Only look inside GRE for version 0 and 1 */ | |
588 | gre_ver = ntohs(hdr->flags & GRE_VERSION); | |
589 | if (gre_ver > 1) | |
590 | return FLOW_DISSECT_RET_OUT_GOOD; | |
591 | ||
592 | *p_proto = hdr->protocol; | |
593 | if (gre_ver) { | |
594 | /* Version1 must be PPTP, and check the flags */ | |
595 | if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY))) | |
596 | return FLOW_DISSECT_RET_OUT_GOOD; | |
597 | } | |
598 | ||
599 | offset += sizeof(struct gre_base_hdr); | |
600 | ||
601 | if (hdr->flags & GRE_CSUM) | |
f195efb4 | 602 | offset += FIELD_SIZEOF(struct gre_full_hdr, csum) + |
603 | FIELD_SIZEOF(struct gre_full_hdr, reserved1); | |
7c92de8e JP |
604 | |
605 | if (hdr->flags & GRE_KEY) { | |
606 | const __be32 *keyid; | |
607 | __be32 _keyid; | |
608 | ||
609 | keyid = __skb_header_pointer(skb, *p_nhoff + offset, | |
610 | sizeof(_keyid), | |
611 | data, *p_hlen, &_keyid); | |
612 | if (!keyid) | |
613 | return FLOW_DISSECT_RET_OUT_BAD; | |
614 | ||
615 | if (dissector_uses_key(flow_dissector, | |
616 | FLOW_DISSECTOR_KEY_GRE_KEYID)) { | |
617 | key_keyid = skb_flow_dissector_target(flow_dissector, | |
618 | FLOW_DISSECTOR_KEY_GRE_KEYID, | |
619 | target_container); | |
620 | if (gre_ver == 0) | |
621 | key_keyid->keyid = *keyid; | |
622 | else | |
623 | key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK; | |
624 | } | |
f195efb4 | 625 | offset += FIELD_SIZEOF(struct gre_full_hdr, key); |
7c92de8e JP |
626 | } |
627 | ||
628 | if (hdr->flags & GRE_SEQ) | |
f195efb4 | 629 | offset += FIELD_SIZEOF(struct pptp_gre_header, seq); |
7c92de8e JP |
630 | |
631 | if (gre_ver == 0) { | |
632 | if (*p_proto == htons(ETH_P_TEB)) { | |
633 | const struct ethhdr *eth; | |
634 | struct ethhdr _eth; | |
635 | ||
636 | eth = __skb_header_pointer(skb, *p_nhoff + offset, | |
637 | sizeof(_eth), | |
638 | data, *p_hlen, &_eth); | |
639 | if (!eth) | |
640 | return FLOW_DISSECT_RET_OUT_BAD; | |
641 | *p_proto = eth->h_proto; | |
642 | offset += sizeof(*eth); | |
643 | ||
644 | /* Cap headers that we access via pointers at the | |
645 | * end of the Ethernet header as our maximum alignment | |
646 | * at that point is only 2 bytes. | |
647 | */ | |
648 | if (NET_IP_ALIGN) | |
649 | *p_hlen = *p_nhoff + offset; | |
650 | } | |
651 | } else { /* version 1, must be PPTP */ | |
652 | u8 _ppp_hdr[PPP_HDRLEN]; | |
653 | u8 *ppp_hdr; | |
654 | ||
655 | if (hdr->flags & GRE_ACK) | |
f195efb4 | 656 | offset += FIELD_SIZEOF(struct pptp_gre_header, ack); |
7c92de8e JP |
657 | |
658 | ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset, | |
659 | sizeof(_ppp_hdr), | |
660 | data, *p_hlen, _ppp_hdr); | |
661 | if (!ppp_hdr) | |
662 | return FLOW_DISSECT_RET_OUT_BAD; | |
663 | ||
664 | switch (PPP_PROTOCOL(ppp_hdr)) { | |
665 | case PPP_IP: | |
666 | *p_proto = htons(ETH_P_IP); | |
667 | break; | |
668 | case PPP_IPV6: | |
669 | *p_proto = htons(ETH_P_IPV6); | |
670 | break; | |
671 | default: | |
672 | /* Could probably catch some more like MPLS */ | |
673 | break; | |
674 | } | |
675 | ||
676 | offset += PPP_HDRLEN; | |
677 | } | |
678 | ||
679 | *p_nhoff += offset; | |
680 | key_control->flags |= FLOW_DIS_ENCAPSULATION; | |
681 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) | |
682 | return FLOW_DISSECT_RET_OUT_GOOD; | |
683 | ||
3a1214e8 | 684 | return FLOW_DISSECT_RET_PROTO_AGAIN; |
7c92de8e JP |
685 | } |
686 | ||
5b0890a9 SE |
687 | /** |
688 | * __skb_flow_dissect_batadv() - dissect batman-adv header | |
689 | * @skb: sk_buff to with the batman-adv header | |
690 | * @key_control: flow dissectors control key | |
691 | * @data: raw buffer pointer to the packet, if NULL use skb->data | |
692 | * @p_proto: pointer used to update the protocol to process next | |
693 | * @p_nhoff: pointer used to update inner network header offset | |
694 | * @hlen: packet header length | |
695 | * @flags: any combination of FLOW_DISSECTOR_F_* | |
696 | * | |
697 | * ETH_P_BATMAN packets are tried to be dissected. Only | |
698 | * &struct batadv_unicast packets are actually processed because they contain an | |
699 | * inner ethernet header and are usually followed by actual network header. This | |
700 | * allows the flow dissector to continue processing the packet. | |
701 | * | |
702 | * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found, | |
703 | * FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation, | |
704 | * otherwise FLOW_DISSECT_RET_OUT_BAD | |
705 | */ | |
706 | static enum flow_dissect_ret | |
707 | __skb_flow_dissect_batadv(const struct sk_buff *skb, | |
708 | struct flow_dissector_key_control *key_control, | |
709 | void *data, __be16 *p_proto, int *p_nhoff, int hlen, | |
710 | unsigned int flags) | |
711 | { | |
712 | struct { | |
713 | struct batadv_unicast_packet batadv_unicast; | |
714 | struct ethhdr eth; | |
715 | } *hdr, _hdr; | |
716 | ||
717 | hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen, | |
718 | &_hdr); | |
719 | if (!hdr) | |
720 | return FLOW_DISSECT_RET_OUT_BAD; | |
721 | ||
722 | if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION) | |
723 | return FLOW_DISSECT_RET_OUT_BAD; | |
724 | ||
725 | if (hdr->batadv_unicast.packet_type != BATADV_UNICAST) | |
726 | return FLOW_DISSECT_RET_OUT_BAD; | |
727 | ||
728 | *p_proto = hdr->eth.h_proto; | |
729 | *p_nhoff += sizeof(*hdr); | |
730 | ||
731 | key_control->flags |= FLOW_DIS_ENCAPSULATION; | |
732 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) | |
733 | return FLOW_DISSECT_RET_OUT_GOOD; | |
734 | ||
735 | return FLOW_DISSECT_RET_PROTO_AGAIN; | |
736 | } | |
737 | ||
ac4bb5de JP |
738 | static void |
739 | __skb_flow_dissect_tcp(const struct sk_buff *skb, | |
740 | struct flow_dissector *flow_dissector, | |
741 | void *target_container, void *data, int thoff, int hlen) | |
742 | { | |
743 | struct flow_dissector_key_tcp *key_tcp; | |
744 | struct tcphdr *th, _th; | |
745 | ||
746 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP)) | |
747 | return; | |
748 | ||
749 | th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th); | |
750 | if (!th) | |
751 | return; | |
752 | ||
753 | if (unlikely(__tcp_hdrlen(th) < sizeof(_th))) | |
754 | return; | |
755 | ||
756 | key_tcp = skb_flow_dissector_target(flow_dissector, | |
757 | FLOW_DISSECTOR_KEY_TCP, | |
758 | target_container); | |
759 | key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF)); | |
760 | } | |
761 | ||
518d8a2e OG |
762 | static void |
763 | __skb_flow_dissect_ipv4(const struct sk_buff *skb, | |
764 | struct flow_dissector *flow_dissector, | |
765 | void *target_container, void *data, const struct iphdr *iph) | |
766 | { | |
767 | struct flow_dissector_key_ip *key_ip; | |
768 | ||
769 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP)) | |
770 | return; | |
771 | ||
772 | key_ip = skb_flow_dissector_target(flow_dissector, | |
773 | FLOW_DISSECTOR_KEY_IP, | |
774 | target_container); | |
775 | key_ip->tos = iph->tos; | |
776 | key_ip->ttl = iph->ttl; | |
777 | } | |
778 | ||
779 | static void | |
780 | __skb_flow_dissect_ipv6(const struct sk_buff *skb, | |
781 | struct flow_dissector *flow_dissector, | |
782 | void *target_container, void *data, const struct ipv6hdr *iph) | |
783 | { | |
784 | struct flow_dissector_key_ip *key_ip; | |
785 | ||
786 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP)) | |
787 | return; | |
788 | ||
789 | key_ip = skb_flow_dissector_target(flow_dissector, | |
790 | FLOW_DISSECTOR_KEY_IP, | |
791 | target_container); | |
792 | key_ip->tos = ipv6_get_dsfield(iph); | |
793 | key_ip->ttl = iph->hop_limit; | |
794 | } | |
795 | ||
1eed4dfb TH |
796 | /* Maximum number of protocol headers that can be parsed in |
797 | * __skb_flow_dissect | |
798 | */ | |
799 | #define MAX_FLOW_DISSECT_HDRS 15 | |
800 | ||
801 | static bool skb_flow_dissect_allowed(int *num_hdrs) | |
802 | { | |
803 | ++*num_hdrs; | |
804 | ||
805 | return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS); | |
806 | } | |
807 | ||
d58e468b PP |
808 | static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys, |
809 | struct flow_dissector *flow_dissector, | |
810 | void *target_container) | |
811 | { | |
812 | struct flow_dissector_key_control *key_control; | |
813 | struct flow_dissector_key_basic *key_basic; | |
814 | struct flow_dissector_key_addrs *key_addrs; | |
815 | struct flow_dissector_key_ports *key_ports; | |
71c99e32 | 816 | struct flow_dissector_key_tags *key_tags; |
d58e468b PP |
817 | |
818 | key_control = skb_flow_dissector_target(flow_dissector, | |
819 | FLOW_DISSECTOR_KEY_CONTROL, | |
820 | target_container); | |
821 | key_control->thoff = flow_keys->thoff; | |
822 | if (flow_keys->is_frag) | |
823 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; | |
824 | if (flow_keys->is_first_frag) | |
825 | key_control->flags |= FLOW_DIS_FIRST_FRAG; | |
826 | if (flow_keys->is_encap) | |
827 | key_control->flags |= FLOW_DIS_ENCAPSULATION; | |
828 | ||
829 | key_basic = skb_flow_dissector_target(flow_dissector, | |
830 | FLOW_DISSECTOR_KEY_BASIC, | |
831 | target_container); | |
832 | key_basic->n_proto = flow_keys->n_proto; | |
833 | key_basic->ip_proto = flow_keys->ip_proto; | |
834 | ||
835 | if (flow_keys->addr_proto == ETH_P_IP && | |
836 | dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) { | |
837 | key_addrs = skb_flow_dissector_target(flow_dissector, | |
838 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
839 | target_container); | |
840 | key_addrs->v4addrs.src = flow_keys->ipv4_src; | |
841 | key_addrs->v4addrs.dst = flow_keys->ipv4_dst; | |
842 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
843 | } else if (flow_keys->addr_proto == ETH_P_IPV6 && | |
844 | dissector_uses_key(flow_dissector, | |
845 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
846 | key_addrs = skb_flow_dissector_target(flow_dissector, | |
847 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
848 | target_container); | |
849 | memcpy(&key_addrs->v6addrs, &flow_keys->ipv6_src, | |
850 | sizeof(key_addrs->v6addrs)); | |
851 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
852 | } | |
853 | ||
854 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS)) { | |
855 | key_ports = skb_flow_dissector_target(flow_dissector, | |
856 | FLOW_DISSECTOR_KEY_PORTS, | |
857 | target_container); | |
858 | key_ports->src = flow_keys->sport; | |
859 | key_ports->dst = flow_keys->dport; | |
860 | } | |
71c99e32 SF |
861 | |
862 | if (dissector_uses_key(flow_dissector, | |
863 | FLOW_DISSECTOR_KEY_FLOW_LABEL)) { | |
864 | key_tags = skb_flow_dissector_target(flow_dissector, | |
865 | FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
866 | target_container); | |
867 | key_tags->flow_label = ntohl(flow_keys->flow_label); | |
868 | } | |
d58e468b PP |
869 | } |
870 | ||
089b19a9 | 871 | bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx, |
086f9568 | 872 | __be16 proto, int nhoff, int hlen, unsigned int flags) |
089b19a9 SF |
873 | { |
874 | struct bpf_flow_keys *flow_keys = ctx->flow_keys; | |
875 | u32 result; | |
c8aa7038 SF |
876 | |
877 | /* Pass parameters to the BPF program */ | |
878 | memset(flow_keys, 0, sizeof(*flow_keys)); | |
089b19a9 SF |
879 | flow_keys->n_proto = proto; |
880 | flow_keys->nhoff = nhoff; | |
c8aa7038 SF |
881 | flow_keys->thoff = flow_keys->nhoff; |
882 | ||
086f9568 SF |
883 | BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG != |
884 | (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG); | |
885 | BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL != | |
886 | (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
887 | BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP != | |
888 | (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP); | |
889 | flow_keys->flags = flags; | |
890 | ||
b1c17a9a | 891 | preempt_disable(); |
089b19a9 | 892 | result = BPF_PROG_RUN(prog, ctx); |
b1c17a9a | 893 | preempt_enable(); |
c8aa7038 | 894 | |
089b19a9 | 895 | flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen); |
c8aa7038 | 896 | flow_keys->thoff = clamp_t(u16, flow_keys->thoff, |
089b19a9 | 897 | flow_keys->nhoff, hlen); |
c8aa7038 SF |
898 | |
899 | return result == BPF_OK; | |
900 | } | |
901 | ||
453a940e WC |
902 | /** |
903 | * __skb_flow_dissect - extract the flow_keys struct and return it | |
3cbf4ffb | 904 | * @net: associated network namespace, derived from @skb if NULL |
453a940e | 905 | * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified |
06635a35 JP |
906 | * @flow_dissector: list of keys to dissect |
907 | * @target_container: target structure to put dissected values into | |
453a940e WC |
908 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
909 | * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol | |
910 | * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb) | |
911 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
d79b3baf | 912 | * @flags: flags that control the dissection process, e.g. |
1cc26450 | 913 | * FLOW_DISSECTOR_F_STOP_AT_ENCAP. |
453a940e | 914 | * |
06635a35 JP |
915 | * The function will try to retrieve individual keys into target specified |
916 | * by flow_dissector from either the skbuff or a raw buffer specified by the | |
917 | * rest parameters. | |
918 | * | |
919 | * Caller must take care of zeroing target container memory. | |
453a940e | 920 | */ |
3cbf4ffb SF |
921 | bool __skb_flow_dissect(const struct net *net, |
922 | const struct sk_buff *skb, | |
06635a35 JP |
923 | struct flow_dissector *flow_dissector, |
924 | void *target_container, | |
cd79a238 TH |
925 | void *data, __be16 proto, int nhoff, int hlen, |
926 | unsigned int flags) | |
0744dd00 | 927 | { |
42aecaa9 | 928 | struct flow_dissector_key_control *key_control; |
06635a35 JP |
929 | struct flow_dissector_key_basic *key_basic; |
930 | struct flow_dissector_key_addrs *key_addrs; | |
931 | struct flow_dissector_key_ports *key_ports; | |
d34af823 | 932 | struct flow_dissector_key_tags *key_tags; |
f6a66927 | 933 | struct flow_dissector_key_vlan *key_vlan; |
9b52e3f2 | 934 | struct bpf_prog *attached = NULL; |
3a1214e8 | 935 | enum flow_dissect_ret fdret; |
24c590e3 | 936 | enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX; |
1eed4dfb | 937 | int num_hdrs = 0; |
8e690ffd | 938 | u8 ip_proto = 0; |
34fad54c | 939 | bool ret; |
0744dd00 | 940 | |
690e36e7 DM |
941 | if (!data) { |
942 | data = skb->data; | |
d5709f7a HHZ |
943 | proto = skb_vlan_tag_present(skb) ? |
944 | skb->vlan_proto : skb->protocol; | |
453a940e | 945 | nhoff = skb_network_offset(skb); |
690e36e7 | 946 | hlen = skb_headlen(skb); |
2d571645 | 947 | #if IS_ENABLED(CONFIG_NET_DSA) |
7324157b | 948 | if (unlikely(skb->dev && netdev_uses_dsa(skb->dev))) { |
43e66528 JC |
949 | const struct dsa_device_ops *ops; |
950 | int offset; | |
951 | ||
952 | ops = skb->dev->dsa_ptr->tag_ops; | |
953 | if (ops->flow_dissect && | |
954 | !ops->flow_dissect(skb, &proto, &offset)) { | |
955 | hlen -= offset; | |
956 | nhoff += offset; | |
957 | } | |
958 | } | |
2d571645 | 959 | #endif |
690e36e7 DM |
960 | } |
961 | ||
42aecaa9 TH |
962 | /* It is ensured by skb_flow_dissector_init() that control key will |
963 | * be always present. | |
964 | */ | |
965 | key_control = skb_flow_dissector_target(flow_dissector, | |
966 | FLOW_DISSECTOR_KEY_CONTROL, | |
967 | target_container); | |
968 | ||
06635a35 JP |
969 | /* It is ensured by skb_flow_dissector_init() that basic key will |
970 | * be always present. | |
971 | */ | |
972 | key_basic = skb_flow_dissector_target(flow_dissector, | |
973 | FLOW_DISSECTOR_KEY_BASIC, | |
974 | target_container); | |
0744dd00 | 975 | |
d0e13a14 | 976 | if (skb) { |
3cbf4ffb SF |
977 | if (!net) { |
978 | if (skb->dev) | |
979 | net = dev_net(skb->dev); | |
980 | else if (skb->sk) | |
981 | net = sock_net(skb->sk); | |
3cbf4ffb | 982 | } |
9b52e3f2 | 983 | } |
c8aa7038 | 984 | |
9b52e3f2 SF |
985 | WARN_ON_ONCE(!net); |
986 | if (net) { | |
987 | rcu_read_lock(); | |
a11c397c SF |
988 | attached = rcu_dereference(init_net.flow_dissector_prog); |
989 | ||
990 | if (!attached) | |
991 | attached = rcu_dereference(net->flow_dissector_prog); | |
d58e468b | 992 | |
c8aa7038 | 993 | if (attached) { |
9b52e3f2 SF |
994 | struct bpf_flow_keys flow_keys; |
995 | struct bpf_flow_dissector ctx = { | |
996 | .flow_keys = &flow_keys, | |
997 | .data = data, | |
998 | .data_end = data + hlen, | |
999 | }; | |
1000 | __be16 n_proto = proto; | |
1001 | ||
1002 | if (skb) { | |
1003 | ctx.skb = skb; | |
1004 | /* we can't use 'proto' in the skb case | |
1005 | * because it might be set to skb->vlan_proto | |
1006 | * which has been pulled from the data | |
1007 | */ | |
1008 | n_proto = skb->protocol; | |
1009 | } | |
1010 | ||
1011 | ret = bpf_flow_dissect(attached, &ctx, n_proto, nhoff, | |
086f9568 | 1012 | hlen, flags); |
c8aa7038 SF |
1013 | __skb_flow_bpf_to_target(&flow_keys, flow_dissector, |
1014 | target_container); | |
1015 | rcu_read_unlock(); | |
1016 | return ret; | |
1017 | } | |
d58e468b | 1018 | rcu_read_unlock(); |
d58e468b | 1019 | } |
d58e468b | 1020 | |
20a17bf6 DM |
1021 | if (dissector_uses_key(flow_dissector, |
1022 | FLOW_DISSECTOR_KEY_ETH_ADDRS)) { | |
67a900cc JP |
1023 | struct ethhdr *eth = eth_hdr(skb); |
1024 | struct flow_dissector_key_eth_addrs *key_eth_addrs; | |
1025 | ||
1026 | key_eth_addrs = skb_flow_dissector_target(flow_dissector, | |
1027 | FLOW_DISSECTOR_KEY_ETH_ADDRS, | |
1028 | target_container); | |
1029 | memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs)); | |
1030 | } | |
1031 | ||
c5ef188e | 1032 | proto_again: |
3a1214e8 TH |
1033 | fdret = FLOW_DISSECT_RET_CONTINUE; |
1034 | ||
0744dd00 | 1035 | switch (proto) { |
2b8837ae | 1036 | case htons(ETH_P_IP): { |
0744dd00 ED |
1037 | const struct iphdr *iph; |
1038 | struct iphdr _iph; | |
3a1214e8 | 1039 | |
690e36e7 | 1040 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
3a1214e8 TH |
1041 | if (!iph || iph->ihl < 5) { |
1042 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1043 | break; | |
1044 | } | |
1045 | ||
3797d3e8 | 1046 | nhoff += iph->ihl * 4; |
0744dd00 | 1047 | |
3797d3e8 | 1048 | ip_proto = iph->protocol; |
3797d3e8 | 1049 | |
918c023f AD |
1050 | if (dissector_uses_key(flow_dissector, |
1051 | FLOW_DISSECTOR_KEY_IPV4_ADDRS)) { | |
1052 | key_addrs = skb_flow_dissector_target(flow_dissector, | |
1053 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
1054 | target_container); | |
1055 | ||
1056 | memcpy(&key_addrs->v4addrs, &iph->saddr, | |
1057 | sizeof(key_addrs->v4addrs)); | |
1058 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1059 | } | |
807e165d TH |
1060 | |
1061 | if (ip_is_fragment(iph)) { | |
4b36993d | 1062 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
807e165d TH |
1063 | |
1064 | if (iph->frag_off & htons(IP_OFFSET)) { | |
3a1214e8 TH |
1065 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
1066 | break; | |
807e165d | 1067 | } else { |
4b36993d | 1068 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
3a1214e8 TH |
1069 | if (!(flags & |
1070 | FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) { | |
1071 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1072 | break; | |
1073 | } | |
807e165d TH |
1074 | } |
1075 | } | |
1076 | ||
518d8a2e OG |
1077 | __skb_flow_dissect_ipv4(skb, flow_dissector, |
1078 | target_container, data, iph); | |
1079 | ||
0744dd00 ED |
1080 | break; |
1081 | } | |
2b8837ae | 1082 | case htons(ETH_P_IPV6): { |
0744dd00 ED |
1083 | const struct ipv6hdr *iph; |
1084 | struct ipv6hdr _iph; | |
19469a87 | 1085 | |
690e36e7 | 1086 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
3a1214e8 TH |
1087 | if (!iph) { |
1088 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1089 | break; | |
1090 | } | |
0744dd00 ED |
1091 | |
1092 | ip_proto = iph->nexthdr; | |
0744dd00 | 1093 | nhoff += sizeof(struct ipv6hdr); |
19469a87 | 1094 | |
20a17bf6 DM |
1095 | if (dissector_uses_key(flow_dissector, |
1096 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
b3c3106c AD |
1097 | key_addrs = skb_flow_dissector_target(flow_dissector, |
1098 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
1099 | target_container); | |
5af7fb6e | 1100 | |
b3c3106c AD |
1101 | memcpy(&key_addrs->v6addrs, &iph->saddr, |
1102 | sizeof(key_addrs->v6addrs)); | |
c3f83241 | 1103 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; |
b924933c | 1104 | } |
87ee9e52 | 1105 | |
461547f3 AD |
1106 | if ((dissector_uses_key(flow_dissector, |
1107 | FLOW_DISSECTOR_KEY_FLOW_LABEL) || | |
1108 | (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) && | |
1109 | ip6_flowlabel(iph)) { | |
1110 | __be32 flow_label = ip6_flowlabel(iph); | |
1111 | ||
20a17bf6 DM |
1112 | if (dissector_uses_key(flow_dissector, |
1113 | FLOW_DISSECTOR_KEY_FLOW_LABEL)) { | |
87ee9e52 TH |
1114 | key_tags = skb_flow_dissector_target(flow_dissector, |
1115 | FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
1116 | target_container); | |
1117 | key_tags->flow_label = ntohl(flow_label); | |
12c227ec | 1118 | } |
3a1214e8 TH |
1119 | if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) { |
1120 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1121 | break; | |
1122 | } | |
19469a87 TH |
1123 | } |
1124 | ||
518d8a2e OG |
1125 | __skb_flow_dissect_ipv6(skb, flow_dissector, |
1126 | target_container, data, iph); | |
1127 | ||
0744dd00 ED |
1128 | break; |
1129 | } | |
2b8837ae JP |
1130 | case htons(ETH_P_8021AD): |
1131 | case htons(ETH_P_8021Q): { | |
24c590e3 | 1132 | const struct vlan_hdr *vlan = NULL; |
bc72f3dd | 1133 | struct vlan_hdr _vlan; |
2064c3d4 | 1134 | __be16 saved_vlan_tpid = proto; |
0744dd00 | 1135 | |
24c590e3 JL |
1136 | if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX && |
1137 | skb && skb_vlan_tag_present(skb)) { | |
d5709f7a | 1138 | proto = skb->protocol; |
24c590e3 | 1139 | } else { |
d5709f7a HHZ |
1140 | vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), |
1141 | data, hlen, &_vlan); | |
3a1214e8 TH |
1142 | if (!vlan) { |
1143 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1144 | break; | |
1145 | } | |
1146 | ||
d5709f7a HHZ |
1147 | proto = vlan->h_vlan_encapsulated_proto; |
1148 | nhoff += sizeof(*vlan); | |
d5709f7a | 1149 | } |
0744dd00 | 1150 | |
24c590e3 JL |
1151 | if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) { |
1152 | dissector_vlan = FLOW_DISSECTOR_KEY_VLAN; | |
1153 | } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) { | |
1154 | dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN; | |
1155 | } else { | |
1156 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1157 | break; | |
1158 | } | |
1159 | ||
1160 | if (dissector_uses_key(flow_dissector, dissector_vlan)) { | |
f6a66927 | 1161 | key_vlan = skb_flow_dissector_target(flow_dissector, |
24c590e3 | 1162 | dissector_vlan, |
d34af823 TH |
1163 | target_container); |
1164 | ||
24c590e3 | 1165 | if (!vlan) { |
f6a66927 | 1166 | key_vlan->vlan_id = skb_vlan_tag_get_id(skb); |
9b319148 | 1167 | key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb); |
f6a66927 HHZ |
1168 | } else { |
1169 | key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) & | |
d5709f7a | 1170 | VLAN_VID_MASK; |
f6a66927 HHZ |
1171 | key_vlan->vlan_priority = |
1172 | (ntohs(vlan->h_vlan_TCI) & | |
1173 | VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT; | |
1174 | } | |
2064c3d4 | 1175 | key_vlan->vlan_tpid = saved_vlan_tpid; |
d34af823 TH |
1176 | } |
1177 | ||
3a1214e8 TH |
1178 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; |
1179 | break; | |
0744dd00 | 1180 | } |
2b8837ae | 1181 | case htons(ETH_P_PPP_SES): { |
0744dd00 ED |
1182 | struct { |
1183 | struct pppoe_hdr hdr; | |
1184 | __be16 proto; | |
1185 | } *hdr, _hdr; | |
690e36e7 | 1186 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
3a1214e8 TH |
1187 | if (!hdr) { |
1188 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1189 | break; | |
1190 | } | |
1191 | ||
0744dd00 ED |
1192 | proto = hdr->proto; |
1193 | nhoff += PPPOE_SES_HLEN; | |
1194 | switch (proto) { | |
2b8837ae | 1195 | case htons(PPP_IP): |
3a1214e8 TH |
1196 | proto = htons(ETH_P_IP); |
1197 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1198 | break; | |
2b8837ae | 1199 | case htons(PPP_IPV6): |
3a1214e8 TH |
1200 | proto = htons(ETH_P_IPV6); |
1201 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1202 | break; | |
0744dd00 | 1203 | default: |
3a1214e8 TH |
1204 | fdret = FLOW_DISSECT_RET_OUT_BAD; |
1205 | break; | |
0744dd00 | 1206 | } |
3a1214e8 | 1207 | break; |
0744dd00 | 1208 | } |
08bfc9cb | 1209 | case htons(ETH_P_TIPC): { |
8d6e79d3 JM |
1210 | struct tipc_basic_hdr *hdr, _hdr; |
1211 | ||
1212 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), | |
1213 | data, hlen, &_hdr); | |
3a1214e8 TH |
1214 | if (!hdr) { |
1215 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1216 | break; | |
1217 | } | |
06635a35 | 1218 | |
20a17bf6 | 1219 | if (dissector_uses_key(flow_dissector, |
8d6e79d3 | 1220 | FLOW_DISSECTOR_KEY_TIPC)) { |
06635a35 | 1221 | key_addrs = skb_flow_dissector_target(flow_dissector, |
8d6e79d3 | 1222 | FLOW_DISSECTOR_KEY_TIPC, |
06635a35 | 1223 | target_container); |
8d6e79d3 JM |
1224 | key_addrs->tipckey.key = tipc_hdr_rps_key(hdr); |
1225 | key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC; | |
06635a35 | 1226 | } |
3a1214e8 TH |
1227 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
1228 | break; | |
08bfc9cb | 1229 | } |
b3baa0fb TH |
1230 | |
1231 | case htons(ETH_P_MPLS_UC): | |
4a5d6c8b | 1232 | case htons(ETH_P_MPLS_MC): |
3a1214e8 | 1233 | fdret = __skb_flow_dissect_mpls(skb, flow_dissector, |
4a5d6c8b | 1234 | target_container, data, |
3a1214e8 TH |
1235 | nhoff, hlen); |
1236 | break; | |
56193d1b | 1237 | case htons(ETH_P_FCOE): |
3a1214e8 TH |
1238 | if ((hlen - nhoff) < FCOE_HEADER_LEN) { |
1239 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1240 | break; | |
1241 | } | |
224516b3 AD |
1242 | |
1243 | nhoff += FCOE_HEADER_LEN; | |
3a1214e8 TH |
1244 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
1245 | break; | |
55733350 SH |
1246 | |
1247 | case htons(ETH_P_ARP): | |
9bf881ff | 1248 | case htons(ETH_P_RARP): |
3a1214e8 | 1249 | fdret = __skb_flow_dissect_arp(skb, flow_dissector, |
9bf881ff | 1250 | target_container, data, |
3a1214e8 TH |
1251 | nhoff, hlen); |
1252 | break; | |
1253 | ||
5b0890a9 SE |
1254 | case htons(ETH_P_BATMAN): |
1255 | fdret = __skb_flow_dissect_batadv(skb, key_control, data, | |
1256 | &proto, &nhoff, hlen, flags); | |
1257 | break; | |
1258 | ||
3a1214e8 TH |
1259 | default: |
1260 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1261 | break; | |
1262 | } | |
1263 | ||
1264 | /* Process result of proto processing */ | |
1265 | switch (fdret) { | |
1266 | case FLOW_DISSECT_RET_OUT_GOOD: | |
1267 | goto out_good; | |
1268 | case FLOW_DISSECT_RET_PROTO_AGAIN: | |
1eed4dfb TH |
1269 | if (skb_flow_dissect_allowed(&num_hdrs)) |
1270 | goto proto_again; | |
1271 | goto out_good; | |
3a1214e8 TH |
1272 | case FLOW_DISSECT_RET_CONTINUE: |
1273 | case FLOW_DISSECT_RET_IPPROTO_AGAIN: | |
1274 | break; | |
1275 | case FLOW_DISSECT_RET_OUT_BAD: | |
0744dd00 | 1276 | default: |
a6e544b0 | 1277 | goto out_bad; |
0744dd00 ED |
1278 | } |
1279 | ||
6a74fcf4 | 1280 | ip_proto_again: |
3a1214e8 TH |
1281 | fdret = FLOW_DISSECT_RET_CONTINUE; |
1282 | ||
0744dd00 | 1283 | switch (ip_proto) { |
7c92de8e | 1284 | case IPPROTO_GRE: |
3a1214e8 | 1285 | fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector, |
7c92de8e | 1286 | target_container, data, |
3a1214e8 TH |
1287 | &proto, &nhoff, &hlen, flags); |
1288 | break; | |
1289 | ||
6a74fcf4 TH |
1290 | case NEXTHDR_HOP: |
1291 | case NEXTHDR_ROUTING: | |
1292 | case NEXTHDR_DEST: { | |
1293 | u8 _opthdr[2], *opthdr; | |
1294 | ||
1295 | if (proto != htons(ETH_P_IPV6)) | |
1296 | break; | |
1297 | ||
1298 | opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr), | |
1299 | data, hlen, &_opthdr); | |
3a1214e8 TH |
1300 | if (!opthdr) { |
1301 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1302 | break; | |
1303 | } | |
6a74fcf4 | 1304 | |
1e98a0f0 ED |
1305 | ip_proto = opthdr[0]; |
1306 | nhoff += (opthdr[1] + 1) << 3; | |
6a74fcf4 | 1307 | |
3a1214e8 TH |
1308 | fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN; |
1309 | break; | |
6a74fcf4 | 1310 | } |
b840f28b TH |
1311 | case NEXTHDR_FRAGMENT: { |
1312 | struct frag_hdr _fh, *fh; | |
1313 | ||
1314 | if (proto != htons(ETH_P_IPV6)) | |
1315 | break; | |
1316 | ||
1317 | fh = __skb_header_pointer(skb, nhoff, sizeof(_fh), | |
1318 | data, hlen, &_fh); | |
1319 | ||
3a1214e8 TH |
1320 | if (!fh) { |
1321 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
1322 | break; | |
1323 | } | |
b840f28b | 1324 | |
4b36993d | 1325 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
b840f28b TH |
1326 | |
1327 | nhoff += sizeof(_fh); | |
43d2ccb3 | 1328 | ip_proto = fh->nexthdr; |
b840f28b TH |
1329 | |
1330 | if (!(fh->frag_off & htons(IP6_OFFSET))) { | |
4b36993d | 1331 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
3a1214e8 TH |
1332 | if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) { |
1333 | fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN; | |
1334 | break; | |
1335 | } | |
b840f28b | 1336 | } |
3a1214e8 TH |
1337 | |
1338 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1339 | break; | |
b840f28b | 1340 | } |
0744dd00 | 1341 | case IPPROTO_IPIP: |
fca41895 | 1342 | proto = htons(ETH_P_IP); |
823b9693 | 1343 | |
4b36993d | 1344 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
3a1214e8 TH |
1345 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) { |
1346 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1347 | break; | |
1348 | } | |
1349 | ||
1350 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1351 | break; | |
823b9693 | 1352 | |
b438f940 TH |
1353 | case IPPROTO_IPV6: |
1354 | proto = htons(ETH_P_IPV6); | |
823b9693 | 1355 | |
4b36993d | 1356 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
3a1214e8 TH |
1357 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) { |
1358 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
1359 | break; | |
1360 | } | |
1361 | ||
1362 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
1363 | break; | |
1364 | ||
823b9693 | 1365 | |
b3baa0fb TH |
1366 | case IPPROTO_MPLS: |
1367 | proto = htons(ETH_P_MPLS_UC); | |
3a1214e8 TH |
1368 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; |
1369 | break; | |
1370 | ||
ac4bb5de JP |
1371 | case IPPROTO_TCP: |
1372 | __skb_flow_dissect_tcp(skb, flow_dissector, target_container, | |
1373 | data, nhoff, hlen); | |
1374 | break; | |
3a1214e8 | 1375 | |
3b336d6f MC |
1376 | case IPPROTO_ICMP: |
1377 | case IPPROTO_ICMPV6: | |
1378 | __skb_flow_dissect_icmp(skb, flow_dissector, target_container, | |
1379 | data, nhoff, hlen); | |
1380 | break; | |
1381 | ||
0744dd00 ED |
1382 | default: |
1383 | break; | |
1384 | } | |
1385 | ||
62230715 | 1386 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS) && |
1387 | !(key_control->flags & FLOW_DIS_IS_FRAGMENT)) { | |
06635a35 JP |
1388 | key_ports = skb_flow_dissector_target(flow_dissector, |
1389 | FLOW_DISSECTOR_KEY_PORTS, | |
1390 | target_container); | |
1391 | key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto, | |
1392 | data, hlen); | |
1393 | } | |
5af7fb6e | 1394 | |
3a1214e8 TH |
1395 | /* Process result of IP proto processing */ |
1396 | switch (fdret) { | |
1397 | case FLOW_DISSECT_RET_PROTO_AGAIN: | |
1eed4dfb TH |
1398 | if (skb_flow_dissect_allowed(&num_hdrs)) |
1399 | goto proto_again; | |
1400 | break; | |
3a1214e8 | 1401 | case FLOW_DISSECT_RET_IPPROTO_AGAIN: |
1eed4dfb TH |
1402 | if (skb_flow_dissect_allowed(&num_hdrs)) |
1403 | goto ip_proto_again; | |
1404 | break; | |
3a1214e8 TH |
1405 | case FLOW_DISSECT_RET_OUT_GOOD: |
1406 | case FLOW_DISSECT_RET_CONTINUE: | |
1407 | break; | |
1408 | case FLOW_DISSECT_RET_OUT_BAD: | |
1409 | default: | |
1410 | goto out_bad; | |
1411 | } | |
1412 | ||
a6e544b0 TH |
1413 | out_good: |
1414 | ret = true; | |
1415 | ||
34fad54c | 1416 | out: |
d0c081b4 | 1417 | key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen); |
a6e544b0 TH |
1418 | key_basic->n_proto = proto; |
1419 | key_basic->ip_proto = ip_proto; | |
a6e544b0 TH |
1420 | |
1421 | return ret; | |
34fad54c ED |
1422 | |
1423 | out_bad: | |
1424 | ret = false; | |
34fad54c | 1425 | goto out; |
0744dd00 | 1426 | } |
690e36e7 | 1427 | EXPORT_SYMBOL(__skb_flow_dissect); |
441d9d32 | 1428 | |
55667441 | 1429 | static siphash_key_t hashrnd __read_mostly; |
66415cf8 HFS |
1430 | static __always_inline void __flow_hash_secret_init(void) |
1431 | { | |
1432 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
1433 | } | |
1434 | ||
55667441 | 1435 | static const void *flow_keys_hash_start(const struct flow_keys *flow) |
42aecaa9 | 1436 | { |
55667441 ED |
1437 | BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % SIPHASH_ALIGNMENT); |
1438 | return &flow->FLOW_KEYS_HASH_START_FIELD; | |
42aecaa9 TH |
1439 | } |
1440 | ||
20a17bf6 | 1441 | static inline size_t flow_keys_hash_length(const struct flow_keys *flow) |
42aecaa9 | 1442 | { |
c3f83241 | 1443 | size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs); |
d31e9558 | 1444 | |
42aecaa9 | 1445 | BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32)); |
c3f83241 TH |
1446 | |
1447 | switch (flow->control.addr_type) { | |
1448 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1449 | diff -= sizeof(flow->addrs.v4addrs); | |
1450 | break; | |
1451 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1452 | diff -= sizeof(flow->addrs.v6addrs); | |
1453 | break; | |
8d6e79d3 JM |
1454 | case FLOW_DISSECTOR_KEY_TIPC: |
1455 | diff -= sizeof(flow->addrs.tipckey); | |
9f249089 | 1456 | break; |
c3f83241 | 1457 | } |
55667441 | 1458 | return sizeof(*flow) - diff; |
c3f83241 TH |
1459 | } |
1460 | ||
1461 | __be32 flow_get_u32_src(const struct flow_keys *flow) | |
1462 | { | |
1463 | switch (flow->control.addr_type) { | |
1464 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1465 | return flow->addrs.v4addrs.src; | |
1466 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1467 | return (__force __be32)ipv6_addr_hash( | |
1468 | &flow->addrs.v6addrs.src); | |
8d6e79d3 JM |
1469 | case FLOW_DISSECTOR_KEY_TIPC: |
1470 | return flow->addrs.tipckey.key; | |
c3f83241 TH |
1471 | default: |
1472 | return 0; | |
1473 | } | |
1474 | } | |
1475 | EXPORT_SYMBOL(flow_get_u32_src); | |
1476 | ||
1477 | __be32 flow_get_u32_dst(const struct flow_keys *flow) | |
1478 | { | |
1479 | switch (flow->control.addr_type) { | |
1480 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1481 | return flow->addrs.v4addrs.dst; | |
1482 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1483 | return (__force __be32)ipv6_addr_hash( | |
1484 | &flow->addrs.v6addrs.dst); | |
1485 | default: | |
1486 | return 0; | |
1487 | } | |
1488 | } | |
1489 | EXPORT_SYMBOL(flow_get_u32_dst); | |
1490 | ||
98298e6c MC |
1491 | /* Sort the source and destination IP (and the ports if the IP are the same), |
1492 | * to have consistent hash within the two directions | |
1493 | */ | |
c3f83241 TH |
1494 | static inline void __flow_hash_consistentify(struct flow_keys *keys) |
1495 | { | |
1496 | int addr_diff, i; | |
1497 | ||
1498 | switch (keys->control.addr_type) { | |
1499 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1500 | addr_diff = (__force u32)keys->addrs.v4addrs.dst - | |
1501 | (__force u32)keys->addrs.v4addrs.src; | |
1502 | if ((addr_diff < 0) || | |
1503 | (addr_diff == 0 && | |
1504 | ((__force u16)keys->ports.dst < | |
1505 | (__force u16)keys->ports.src))) { | |
1506 | swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst); | |
1507 | swap(keys->ports.src, keys->ports.dst); | |
1508 | } | |
1509 | break; | |
1510 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1511 | addr_diff = memcmp(&keys->addrs.v6addrs.dst, | |
1512 | &keys->addrs.v6addrs.src, | |
1513 | sizeof(keys->addrs.v6addrs.dst)); | |
1514 | if ((addr_diff < 0) || | |
1515 | (addr_diff == 0 && | |
1516 | ((__force u16)keys->ports.dst < | |
1517 | (__force u16)keys->ports.src))) { | |
1518 | for (i = 0; i < 4; i++) | |
1519 | swap(keys->addrs.v6addrs.src.s6_addr32[i], | |
1520 | keys->addrs.v6addrs.dst.s6_addr32[i]); | |
1521 | swap(keys->ports.src, keys->ports.dst); | |
1522 | } | |
1523 | break; | |
1524 | } | |
66415cf8 HFS |
1525 | } |
1526 | ||
55667441 ED |
1527 | static inline u32 __flow_hash_from_keys(struct flow_keys *keys, |
1528 | const siphash_key_t *keyval) | |
5ed20a68 TH |
1529 | { |
1530 | u32 hash; | |
1531 | ||
c3f83241 | 1532 | __flow_hash_consistentify(keys); |
5ed20a68 | 1533 | |
55667441 ED |
1534 | hash = siphash(flow_keys_hash_start(keys), |
1535 | flow_keys_hash_length(keys), keyval); | |
5ed20a68 TH |
1536 | if (!hash) |
1537 | hash = 1; | |
1538 | ||
1539 | return hash; | |
1540 | } | |
1541 | ||
1542 | u32 flow_hash_from_keys(struct flow_keys *keys) | |
1543 | { | |
50fb7992 | 1544 | __flow_hash_secret_init(); |
55667441 | 1545 | return __flow_hash_from_keys(keys, &hashrnd); |
5ed20a68 TH |
1546 | } |
1547 | EXPORT_SYMBOL(flow_hash_from_keys); | |
1548 | ||
50fb7992 | 1549 | static inline u32 ___skb_get_hash(const struct sk_buff *skb, |
55667441 ED |
1550 | struct flow_keys *keys, |
1551 | const siphash_key_t *keyval) | |
50fb7992 | 1552 | { |
6db61d79 TH |
1553 | skb_flow_dissect_flow_keys(skb, keys, |
1554 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
50fb7992 TH |
1555 | |
1556 | return __flow_hash_from_keys(keys, keyval); | |
1557 | } | |
1558 | ||
2f59e1eb TH |
1559 | struct _flow_keys_digest_data { |
1560 | __be16 n_proto; | |
1561 | u8 ip_proto; | |
1562 | u8 padding; | |
1563 | __be32 ports; | |
1564 | __be32 src; | |
1565 | __be32 dst; | |
1566 | }; | |
1567 | ||
1568 | void make_flow_keys_digest(struct flow_keys_digest *digest, | |
1569 | const struct flow_keys *flow) | |
1570 | { | |
1571 | struct _flow_keys_digest_data *data = | |
1572 | (struct _flow_keys_digest_data *)digest; | |
1573 | ||
1574 | BUILD_BUG_ON(sizeof(*data) > sizeof(*digest)); | |
1575 | ||
1576 | memset(digest, 0, sizeof(*digest)); | |
1577 | ||
06635a35 JP |
1578 | data->n_proto = flow->basic.n_proto; |
1579 | data->ip_proto = flow->basic.ip_proto; | |
1580 | data->ports = flow->ports.ports; | |
c3f83241 TH |
1581 | data->src = flow->addrs.v4addrs.src; |
1582 | data->dst = flow->addrs.v4addrs.dst; | |
2f59e1eb TH |
1583 | } |
1584 | EXPORT_SYMBOL(make_flow_keys_digest); | |
1585 | ||
eb70db87 DM |
1586 | static struct flow_dissector flow_keys_dissector_symmetric __read_mostly; |
1587 | ||
b917783c | 1588 | u32 __skb_get_hash_symmetric(const struct sk_buff *skb) |
eb70db87 DM |
1589 | { |
1590 | struct flow_keys keys; | |
1591 | ||
1592 | __flow_hash_secret_init(); | |
1593 | ||
1594 | memset(&keys, 0, sizeof(keys)); | |
3cbf4ffb SF |
1595 | __skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric, |
1596 | &keys, NULL, 0, 0, 0, | |
eb70db87 DM |
1597 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); |
1598 | ||
55667441 | 1599 | return __flow_hash_from_keys(&keys, &hashrnd); |
eb70db87 DM |
1600 | } |
1601 | EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric); | |
1602 | ||
d4fd3275 JP |
1603 | /** |
1604 | * __skb_get_hash: calculate a flow hash | |
1605 | * @skb: sk_buff to calculate flow hash from | |
1606 | * | |
1607 | * This function calculates a flow hash based on src/dst addresses | |
61b905da TH |
1608 | * and src/dst port numbers. Sets hash in skb to non-zero hash value |
1609 | * on success, zero indicates no valid hash. Also, sets l4_hash in skb | |
441d9d32 CW |
1610 | * if hash is a canonical 4-tuple hash over transport ports. |
1611 | */ | |
3958afa1 | 1612 | void __skb_get_hash(struct sk_buff *skb) |
441d9d32 CW |
1613 | { |
1614 | struct flow_keys keys; | |
635c223c | 1615 | u32 hash; |
441d9d32 | 1616 | |
50fb7992 TH |
1617 | __flow_hash_secret_init(); |
1618 | ||
55667441 | 1619 | hash = ___skb_get_hash(skb, &keys, &hashrnd); |
635c223c GF |
1620 | |
1621 | __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys)); | |
441d9d32 | 1622 | } |
3958afa1 | 1623 | EXPORT_SYMBOL(__skb_get_hash); |
441d9d32 | 1624 | |
55667441 ED |
1625 | __u32 skb_get_hash_perturb(const struct sk_buff *skb, |
1626 | const siphash_key_t *perturb) | |
50fb7992 TH |
1627 | { |
1628 | struct flow_keys keys; | |
1629 | ||
1630 | return ___skb_get_hash(skb, &keys, perturb); | |
1631 | } | |
1632 | EXPORT_SYMBOL(skb_get_hash_perturb); | |
1633 | ||
56193d1b | 1634 | u32 __skb_get_poff(const struct sk_buff *skb, void *data, |
72a338bc | 1635 | const struct flow_keys_basic *keys, int hlen) |
f77668dc | 1636 | { |
42aecaa9 | 1637 | u32 poff = keys->control.thoff; |
f77668dc | 1638 | |
43d2ccb3 AD |
1639 | /* skip L4 headers for fragments after the first */ |
1640 | if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) && | |
1641 | !(keys->control.flags & FLOW_DIS_FIRST_FRAG)) | |
1642 | return poff; | |
1643 | ||
06635a35 | 1644 | switch (keys->basic.ip_proto) { |
f77668dc | 1645 | case IPPROTO_TCP: { |
5af7fb6e AD |
1646 | /* access doff as u8 to avoid unaligned access */ |
1647 | const u8 *doff; | |
1648 | u8 _doff; | |
f77668dc | 1649 | |
5af7fb6e AD |
1650 | doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff), |
1651 | data, hlen, &_doff); | |
1652 | if (!doff) | |
f77668dc DB |
1653 | return poff; |
1654 | ||
5af7fb6e | 1655 | poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2); |
f77668dc DB |
1656 | break; |
1657 | } | |
1658 | case IPPROTO_UDP: | |
1659 | case IPPROTO_UDPLITE: | |
1660 | poff += sizeof(struct udphdr); | |
1661 | break; | |
1662 | /* For the rest, we do not really care about header | |
1663 | * extensions at this point for now. | |
1664 | */ | |
1665 | case IPPROTO_ICMP: | |
1666 | poff += sizeof(struct icmphdr); | |
1667 | break; | |
1668 | case IPPROTO_ICMPV6: | |
1669 | poff += sizeof(struct icmp6hdr); | |
1670 | break; | |
1671 | case IPPROTO_IGMP: | |
1672 | poff += sizeof(struct igmphdr); | |
1673 | break; | |
1674 | case IPPROTO_DCCP: | |
1675 | poff += sizeof(struct dccp_hdr); | |
1676 | break; | |
1677 | case IPPROTO_SCTP: | |
1678 | poff += sizeof(struct sctphdr); | |
1679 | break; | |
1680 | } | |
1681 | ||
1682 | return poff; | |
1683 | } | |
1684 | ||
0db89b8b JP |
1685 | /** |
1686 | * skb_get_poff - get the offset to the payload | |
1687 | * @skb: sk_buff to get the payload offset from | |
1688 | * | |
1689 | * The function will get the offset to the payload as far as it could | |
1690 | * be dissected. The main user is currently BPF, so that we can dynamically | |
56193d1b AD |
1691 | * truncate packets without needing to push actual payload to the user |
1692 | * space and can analyze headers only, instead. | |
1693 | */ | |
1694 | u32 skb_get_poff(const struct sk_buff *skb) | |
1695 | { | |
72a338bc | 1696 | struct flow_keys_basic keys; |
56193d1b | 1697 | |
3cbf4ffb SF |
1698 | if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys, |
1699 | NULL, 0, 0, 0, 0)) | |
56193d1b AD |
1700 | return 0; |
1701 | ||
1702 | return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb)); | |
1703 | } | |
06635a35 | 1704 | |
20a17bf6 | 1705 | __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys) |
a17ace95 DM |
1706 | { |
1707 | memset(keys, 0, sizeof(*keys)); | |
1708 | ||
1709 | memcpy(&keys->addrs.v6addrs.src, &fl6->saddr, | |
1710 | sizeof(keys->addrs.v6addrs.src)); | |
1711 | memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr, | |
1712 | sizeof(keys->addrs.v6addrs.dst)); | |
1713 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
1714 | keys->ports.src = fl6->fl6_sport; | |
1715 | keys->ports.dst = fl6->fl6_dport; | |
1716 | keys->keyid.keyid = fl6->fl6_gre_key; | |
fa1be7e0 | 1717 | keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
a17ace95 DM |
1718 | keys->basic.ip_proto = fl6->flowi6_proto; |
1719 | ||
1720 | return flow_hash_from_keys(keys); | |
1721 | } | |
1722 | EXPORT_SYMBOL(__get_hash_from_flowi6); | |
1723 | ||
06635a35 | 1724 | static const struct flow_dissector_key flow_keys_dissector_keys[] = { |
42aecaa9 TH |
1725 | { |
1726 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
1727 | .offset = offsetof(struct flow_keys, control), | |
1728 | }, | |
06635a35 JP |
1729 | { |
1730 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
1731 | .offset = offsetof(struct flow_keys, basic), | |
1732 | }, | |
1733 | { | |
1734 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
c3f83241 TH |
1735 | .offset = offsetof(struct flow_keys, addrs.v4addrs), |
1736 | }, | |
1737 | { | |
1738 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
1739 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
06635a35 | 1740 | }, |
9f249089 | 1741 | { |
8d6e79d3 JM |
1742 | .key_id = FLOW_DISSECTOR_KEY_TIPC, |
1743 | .offset = offsetof(struct flow_keys, addrs.tipckey), | |
9f249089 | 1744 | }, |
06635a35 JP |
1745 | { |
1746 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
1747 | .offset = offsetof(struct flow_keys, ports), | |
1748 | }, | |
d34af823 | 1749 | { |
f6a66927 HHZ |
1750 | .key_id = FLOW_DISSECTOR_KEY_VLAN, |
1751 | .offset = offsetof(struct flow_keys, vlan), | |
d34af823 | 1752 | }, |
87ee9e52 TH |
1753 | { |
1754 | .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
1755 | .offset = offsetof(struct flow_keys, tags), | |
1756 | }, | |
1fdd512c TH |
1757 | { |
1758 | .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, | |
1759 | .offset = offsetof(struct flow_keys, keyid), | |
1760 | }, | |
06635a35 JP |
1761 | }; |
1762 | ||
eb70db87 DM |
1763 | static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = { |
1764 | { | |
1765 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
1766 | .offset = offsetof(struct flow_keys, control), | |
1767 | }, | |
1768 | { | |
1769 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
1770 | .offset = offsetof(struct flow_keys, basic), | |
1771 | }, | |
1772 | { | |
1773 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
1774 | .offset = offsetof(struct flow_keys, addrs.v4addrs), | |
1775 | }, | |
1776 | { | |
1777 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
1778 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
1779 | }, | |
1780 | { | |
1781 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
1782 | .offset = offsetof(struct flow_keys, ports), | |
1783 | }, | |
1784 | }; | |
1785 | ||
72a338bc | 1786 | static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = { |
42aecaa9 TH |
1787 | { |
1788 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
1789 | .offset = offsetof(struct flow_keys, control), | |
1790 | }, | |
06635a35 JP |
1791 | { |
1792 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
1793 | .offset = offsetof(struct flow_keys, basic), | |
1794 | }, | |
1795 | }; | |
1796 | ||
1797 | struct flow_dissector flow_keys_dissector __read_mostly; | |
1798 | EXPORT_SYMBOL(flow_keys_dissector); | |
1799 | ||
72a338bc PA |
1800 | struct flow_dissector flow_keys_basic_dissector __read_mostly; |
1801 | EXPORT_SYMBOL(flow_keys_basic_dissector); | |
06635a35 JP |
1802 | |
1803 | static int __init init_default_flow_dissectors(void) | |
1804 | { | |
1805 | skb_flow_dissector_init(&flow_keys_dissector, | |
1806 | flow_keys_dissector_keys, | |
1807 | ARRAY_SIZE(flow_keys_dissector_keys)); | |
eb70db87 DM |
1808 | skb_flow_dissector_init(&flow_keys_dissector_symmetric, |
1809 | flow_keys_dissector_symmetric_keys, | |
1810 | ARRAY_SIZE(flow_keys_dissector_symmetric_keys)); | |
72a338bc PA |
1811 | skb_flow_dissector_init(&flow_keys_basic_dissector, |
1812 | flow_keys_basic_dissector_keys, | |
1813 | ARRAY_SIZE(flow_keys_basic_dissector_keys)); | |
06635a35 JP |
1814 | return 0; |
1815 | } | |
1816 | ||
c9b8af13 | 1817 | core_initcall(init_default_flow_dissectors); |