Commit | Line | Data |
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fbff949e | 1 | #include <linux/kernel.h> |
0744dd00 | 2 | #include <linux/skbuff.h> |
c452ed70 | 3 | #include <linux/export.h> |
0744dd00 ED |
4 | #include <linux/ip.h> |
5 | #include <linux/ipv6.h> | |
6 | #include <linux/if_vlan.h> | |
43e66528 | 7 | #include <net/dsa.h> |
a38402bc | 8 | #include <net/dst_metadata.h> |
0744dd00 | 9 | #include <net/ip.h> |
ddbe5032 | 10 | #include <net/ipv6.h> |
ab10dccb GF |
11 | #include <net/gre.h> |
12 | #include <net/pptp.h> | |
8d6e79d3 | 13 | #include <net/tipc.h> |
f77668dc DB |
14 | #include <linux/igmp.h> |
15 | #include <linux/icmp.h> | |
16 | #include <linux/sctp.h> | |
17 | #include <linux/dccp.h> | |
0744dd00 ED |
18 | #include <linux/if_tunnel.h> |
19 | #include <linux/if_pppox.h> | |
20 | #include <linux/ppp_defs.h> | |
06635a35 | 21 | #include <linux/stddef.h> |
67a900cc | 22 | #include <linux/if_ether.h> |
b3baa0fb | 23 | #include <linux/mpls.h> |
ac4bb5de | 24 | #include <linux/tcp.h> |
1bd758eb | 25 | #include <net/flow_dissector.h> |
56193d1b | 26 | #include <scsi/fc/fc_fcoe.h> |
5b0890a9 | 27 | #include <uapi/linux/batadv_packet.h> |
0744dd00 | 28 | |
20a17bf6 DM |
29 | static void dissector_set_key(struct flow_dissector *flow_dissector, |
30 | enum flow_dissector_key_id key_id) | |
fbff949e JP |
31 | { |
32 | flow_dissector->used_keys |= (1 << key_id); | |
33 | } | |
34 | ||
fbff949e JP |
35 | void skb_flow_dissector_init(struct flow_dissector *flow_dissector, |
36 | const struct flow_dissector_key *key, | |
37 | unsigned int key_count) | |
38 | { | |
39 | unsigned int i; | |
40 | ||
41 | memset(flow_dissector, 0, sizeof(*flow_dissector)); | |
42 | ||
43 | for (i = 0; i < key_count; i++, key++) { | |
44 | /* User should make sure that every key target offset is withing | |
45 | * boundaries of unsigned short. | |
46 | */ | |
47 | BUG_ON(key->offset > USHRT_MAX); | |
20a17bf6 DM |
48 | BUG_ON(dissector_uses_key(flow_dissector, |
49 | key->key_id)); | |
fbff949e | 50 | |
20a17bf6 | 51 | dissector_set_key(flow_dissector, key->key_id); |
fbff949e JP |
52 | flow_dissector->offset[key->key_id] = key->offset; |
53 | } | |
54 | ||
42aecaa9 TH |
55 | /* Ensure that the dissector always includes control and basic key. |
56 | * That way we are able to avoid handling lack of these in fast path. | |
fbff949e | 57 | */ |
20a17bf6 DM |
58 | BUG_ON(!dissector_uses_key(flow_dissector, |
59 | FLOW_DISSECTOR_KEY_CONTROL)); | |
60 | BUG_ON(!dissector_uses_key(flow_dissector, | |
61 | FLOW_DISSECTOR_KEY_BASIC)); | |
fbff949e JP |
62 | } |
63 | EXPORT_SYMBOL(skb_flow_dissector_init); | |
64 | ||
972d3876 SH |
65 | /** |
66 | * skb_flow_get_be16 - extract be16 entity | |
67 | * @skb: sk_buff to extract from | |
68 | * @poff: offset to extract at | |
69 | * @data: raw buffer pointer to the packet | |
70 | * @hlen: packet header length | |
71 | * | |
72 | * The function will try to retrieve a be32 entity at | |
73 | * offset poff | |
74 | */ | |
d9584d8c ED |
75 | static __be16 skb_flow_get_be16(const struct sk_buff *skb, int poff, |
76 | void *data, int hlen) | |
972d3876 SH |
77 | { |
78 | __be16 *u, _u; | |
79 | ||
80 | u = __skb_header_pointer(skb, poff, sizeof(_u), data, hlen, &_u); | |
81 | if (u) | |
82 | return *u; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
357afe9c | 87 | /** |
6451b3f5 WC |
88 | * __skb_flow_get_ports - extract the upper layer ports and return them |
89 | * @skb: sk_buff to extract the ports from | |
357afe9c NA |
90 | * @thoff: transport header offset |
91 | * @ip_proto: protocol for which to get port offset | |
6451b3f5 WC |
92 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
93 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
357afe9c NA |
94 | * |
95 | * The function will try to retrieve the ports at offset thoff + poff where poff | |
96 | * is the protocol port offset returned from proto_ports_offset | |
97 | */ | |
690e36e7 DM |
98 | __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, |
99 | void *data, int hlen) | |
357afe9c NA |
100 | { |
101 | int poff = proto_ports_offset(ip_proto); | |
102 | ||
690e36e7 DM |
103 | if (!data) { |
104 | data = skb->data; | |
105 | hlen = skb_headlen(skb); | |
106 | } | |
107 | ||
357afe9c NA |
108 | if (poff >= 0) { |
109 | __be32 *ports, _ports; | |
110 | ||
690e36e7 DM |
111 | ports = __skb_header_pointer(skb, thoff + poff, |
112 | sizeof(_ports), data, hlen, &_ports); | |
357afe9c NA |
113 | if (ports) |
114 | return *ports; | |
115 | } | |
116 | ||
117 | return 0; | |
118 | } | |
690e36e7 | 119 | EXPORT_SYMBOL(__skb_flow_get_ports); |
357afe9c | 120 | |
a38402bc SH |
121 | static void |
122 | skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type, | |
123 | struct flow_dissector *flow_dissector, | |
124 | void *target_container) | |
125 | { | |
126 | struct flow_dissector_key_control *ctrl; | |
127 | ||
128 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL)) | |
129 | return; | |
130 | ||
131 | ctrl = skb_flow_dissector_target(flow_dissector, | |
132 | FLOW_DISSECTOR_KEY_ENC_CONTROL, | |
133 | target_container); | |
134 | ctrl->addr_type = type; | |
135 | } | |
136 | ||
62b32379 SH |
137 | void |
138 | skb_flow_dissect_tunnel_info(const struct sk_buff *skb, | |
139 | struct flow_dissector *flow_dissector, | |
140 | void *target_container) | |
a38402bc SH |
141 | { |
142 | struct ip_tunnel_info *info; | |
143 | struct ip_tunnel_key *key; | |
144 | ||
145 | /* A quick check to see if there might be something to do. */ | |
146 | if (!dissector_uses_key(flow_dissector, | |
147 | FLOW_DISSECTOR_KEY_ENC_KEYID) && | |
148 | !dissector_uses_key(flow_dissector, | |
149 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) && | |
150 | !dissector_uses_key(flow_dissector, | |
151 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) && | |
152 | !dissector_uses_key(flow_dissector, | |
153 | FLOW_DISSECTOR_KEY_ENC_CONTROL) && | |
154 | !dissector_uses_key(flow_dissector, | |
155 | FLOW_DISSECTOR_KEY_ENC_PORTS)) | |
156 | return; | |
157 | ||
158 | info = skb_tunnel_info(skb); | |
159 | if (!info) | |
160 | return; | |
161 | ||
162 | key = &info->key; | |
163 | ||
164 | switch (ip_tunnel_info_af(info)) { | |
165 | case AF_INET: | |
166 | skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
167 | flow_dissector, | |
168 | target_container); | |
169 | if (dissector_uses_key(flow_dissector, | |
170 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) { | |
171 | struct flow_dissector_key_ipv4_addrs *ipv4; | |
172 | ||
173 | ipv4 = skb_flow_dissector_target(flow_dissector, | |
174 | FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, | |
175 | target_container); | |
176 | ipv4->src = key->u.ipv4.src; | |
177 | ipv4->dst = key->u.ipv4.dst; | |
178 | } | |
179 | break; | |
180 | case AF_INET6: | |
181 | skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
182 | flow_dissector, | |
183 | target_container); | |
184 | if (dissector_uses_key(flow_dissector, | |
185 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) { | |
186 | struct flow_dissector_key_ipv6_addrs *ipv6; | |
187 | ||
188 | ipv6 = skb_flow_dissector_target(flow_dissector, | |
189 | FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, | |
190 | target_container); | |
191 | ipv6->src = key->u.ipv6.src; | |
192 | ipv6->dst = key->u.ipv6.dst; | |
193 | } | |
194 | break; | |
195 | } | |
196 | ||
197 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) { | |
198 | struct flow_dissector_key_keyid *keyid; | |
199 | ||
200 | keyid = skb_flow_dissector_target(flow_dissector, | |
201 | FLOW_DISSECTOR_KEY_ENC_KEYID, | |
202 | target_container); | |
203 | keyid->keyid = tunnel_id_to_key32(key->tun_id); | |
204 | } | |
205 | ||
206 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) { | |
207 | struct flow_dissector_key_ports *tp; | |
208 | ||
209 | tp = skb_flow_dissector_target(flow_dissector, | |
210 | FLOW_DISSECTOR_KEY_ENC_PORTS, | |
211 | target_container); | |
212 | tp->src = key->tp_src; | |
213 | tp->dst = key->tp_dst; | |
214 | } | |
215 | } | |
62b32379 | 216 | EXPORT_SYMBOL(skb_flow_dissect_tunnel_info); |
a38402bc | 217 | |
4a5d6c8b JP |
218 | static enum flow_dissect_ret |
219 | __skb_flow_dissect_mpls(const struct sk_buff *skb, | |
220 | struct flow_dissector *flow_dissector, | |
221 | void *target_container, void *data, int nhoff, int hlen) | |
222 | { | |
223 | struct flow_dissector_key_keyid *key_keyid; | |
224 | struct mpls_label *hdr, _hdr[2]; | |
029c1ecb | 225 | u32 entry, label; |
4a5d6c8b JP |
226 | |
227 | if (!dissector_uses_key(flow_dissector, | |
029c1ecb BL |
228 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY) && |
229 | !dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) | |
4a5d6c8b JP |
230 | return FLOW_DISSECT_RET_OUT_GOOD; |
231 | ||
232 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, | |
233 | hlen, &_hdr); | |
234 | if (!hdr) | |
235 | return FLOW_DISSECT_RET_OUT_BAD; | |
236 | ||
029c1ecb BL |
237 | entry = ntohl(hdr[0].entry); |
238 | label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT; | |
239 | ||
240 | if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) { | |
241 | struct flow_dissector_key_mpls *key_mpls; | |
242 | ||
243 | key_mpls = skb_flow_dissector_target(flow_dissector, | |
244 | FLOW_DISSECTOR_KEY_MPLS, | |
245 | target_container); | |
246 | key_mpls->mpls_label = label; | |
247 | key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK) | |
248 | >> MPLS_LS_TTL_SHIFT; | |
249 | key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK) | |
250 | >> MPLS_LS_TC_SHIFT; | |
251 | key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK) | |
252 | >> MPLS_LS_S_SHIFT; | |
253 | } | |
254 | ||
255 | if (label == MPLS_LABEL_ENTROPY) { | |
4a5d6c8b JP |
256 | key_keyid = skb_flow_dissector_target(flow_dissector, |
257 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY, | |
258 | target_container); | |
259 | key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK); | |
260 | } | |
261 | return FLOW_DISSECT_RET_OUT_GOOD; | |
262 | } | |
263 | ||
9bf881ff JP |
264 | static enum flow_dissect_ret |
265 | __skb_flow_dissect_arp(const struct sk_buff *skb, | |
266 | struct flow_dissector *flow_dissector, | |
267 | void *target_container, void *data, int nhoff, int hlen) | |
268 | { | |
269 | struct flow_dissector_key_arp *key_arp; | |
270 | struct { | |
271 | unsigned char ar_sha[ETH_ALEN]; | |
272 | unsigned char ar_sip[4]; | |
273 | unsigned char ar_tha[ETH_ALEN]; | |
274 | unsigned char ar_tip[4]; | |
275 | } *arp_eth, _arp_eth; | |
276 | const struct arphdr *arp; | |
6f14f443 | 277 | struct arphdr _arp; |
9bf881ff JP |
278 | |
279 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP)) | |
280 | return FLOW_DISSECT_RET_OUT_GOOD; | |
281 | ||
282 | arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data, | |
283 | hlen, &_arp); | |
284 | if (!arp) | |
285 | return FLOW_DISSECT_RET_OUT_BAD; | |
286 | ||
287 | if (arp->ar_hrd != htons(ARPHRD_ETHER) || | |
288 | arp->ar_pro != htons(ETH_P_IP) || | |
289 | arp->ar_hln != ETH_ALEN || | |
290 | arp->ar_pln != 4 || | |
291 | (arp->ar_op != htons(ARPOP_REPLY) && | |
292 | arp->ar_op != htons(ARPOP_REQUEST))) | |
293 | return FLOW_DISSECT_RET_OUT_BAD; | |
294 | ||
295 | arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp), | |
296 | sizeof(_arp_eth), data, | |
297 | hlen, &_arp_eth); | |
298 | if (!arp_eth) | |
299 | return FLOW_DISSECT_RET_OUT_BAD; | |
300 | ||
301 | key_arp = skb_flow_dissector_target(flow_dissector, | |
302 | FLOW_DISSECTOR_KEY_ARP, | |
303 | target_container); | |
304 | ||
305 | memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip)); | |
306 | memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip)); | |
307 | ||
308 | /* Only store the lower byte of the opcode; | |
309 | * this covers ARPOP_REPLY and ARPOP_REQUEST. | |
310 | */ | |
311 | key_arp->op = ntohs(arp->ar_op) & 0xff; | |
312 | ||
313 | ether_addr_copy(key_arp->sha, arp_eth->ar_sha); | |
314 | ether_addr_copy(key_arp->tha, arp_eth->ar_tha); | |
315 | ||
316 | return FLOW_DISSECT_RET_OUT_GOOD; | |
317 | } | |
318 | ||
7c92de8e JP |
319 | static enum flow_dissect_ret |
320 | __skb_flow_dissect_gre(const struct sk_buff *skb, | |
321 | struct flow_dissector_key_control *key_control, | |
322 | struct flow_dissector *flow_dissector, | |
323 | void *target_container, void *data, | |
324 | __be16 *p_proto, int *p_nhoff, int *p_hlen, | |
325 | unsigned int flags) | |
326 | { | |
327 | struct flow_dissector_key_keyid *key_keyid; | |
328 | struct gre_base_hdr *hdr, _hdr; | |
329 | int offset = 0; | |
330 | u16 gre_ver; | |
331 | ||
332 | hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), | |
333 | data, *p_hlen, &_hdr); | |
334 | if (!hdr) | |
335 | return FLOW_DISSECT_RET_OUT_BAD; | |
336 | ||
337 | /* Only look inside GRE without routing */ | |
338 | if (hdr->flags & GRE_ROUTING) | |
339 | return FLOW_DISSECT_RET_OUT_GOOD; | |
340 | ||
341 | /* Only look inside GRE for version 0 and 1 */ | |
342 | gre_ver = ntohs(hdr->flags & GRE_VERSION); | |
343 | if (gre_ver > 1) | |
344 | return FLOW_DISSECT_RET_OUT_GOOD; | |
345 | ||
346 | *p_proto = hdr->protocol; | |
347 | if (gre_ver) { | |
348 | /* Version1 must be PPTP, and check the flags */ | |
349 | if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY))) | |
350 | return FLOW_DISSECT_RET_OUT_GOOD; | |
351 | } | |
352 | ||
353 | offset += sizeof(struct gre_base_hdr); | |
354 | ||
355 | if (hdr->flags & GRE_CSUM) | |
356 | offset += sizeof(((struct gre_full_hdr *) 0)->csum) + | |
357 | sizeof(((struct gre_full_hdr *) 0)->reserved1); | |
358 | ||
359 | if (hdr->flags & GRE_KEY) { | |
360 | const __be32 *keyid; | |
361 | __be32 _keyid; | |
362 | ||
363 | keyid = __skb_header_pointer(skb, *p_nhoff + offset, | |
364 | sizeof(_keyid), | |
365 | data, *p_hlen, &_keyid); | |
366 | if (!keyid) | |
367 | return FLOW_DISSECT_RET_OUT_BAD; | |
368 | ||
369 | if (dissector_uses_key(flow_dissector, | |
370 | FLOW_DISSECTOR_KEY_GRE_KEYID)) { | |
371 | key_keyid = skb_flow_dissector_target(flow_dissector, | |
372 | FLOW_DISSECTOR_KEY_GRE_KEYID, | |
373 | target_container); | |
374 | if (gre_ver == 0) | |
375 | key_keyid->keyid = *keyid; | |
376 | else | |
377 | key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK; | |
378 | } | |
379 | offset += sizeof(((struct gre_full_hdr *) 0)->key); | |
380 | } | |
381 | ||
382 | if (hdr->flags & GRE_SEQ) | |
383 | offset += sizeof(((struct pptp_gre_header *) 0)->seq); | |
384 | ||
385 | if (gre_ver == 0) { | |
386 | if (*p_proto == htons(ETH_P_TEB)) { | |
387 | const struct ethhdr *eth; | |
388 | struct ethhdr _eth; | |
389 | ||
390 | eth = __skb_header_pointer(skb, *p_nhoff + offset, | |
391 | sizeof(_eth), | |
392 | data, *p_hlen, &_eth); | |
393 | if (!eth) | |
394 | return FLOW_DISSECT_RET_OUT_BAD; | |
395 | *p_proto = eth->h_proto; | |
396 | offset += sizeof(*eth); | |
397 | ||
398 | /* Cap headers that we access via pointers at the | |
399 | * end of the Ethernet header as our maximum alignment | |
400 | * at that point is only 2 bytes. | |
401 | */ | |
402 | if (NET_IP_ALIGN) | |
403 | *p_hlen = *p_nhoff + offset; | |
404 | } | |
405 | } else { /* version 1, must be PPTP */ | |
406 | u8 _ppp_hdr[PPP_HDRLEN]; | |
407 | u8 *ppp_hdr; | |
408 | ||
409 | if (hdr->flags & GRE_ACK) | |
410 | offset += sizeof(((struct pptp_gre_header *) 0)->ack); | |
411 | ||
412 | ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset, | |
413 | sizeof(_ppp_hdr), | |
414 | data, *p_hlen, _ppp_hdr); | |
415 | if (!ppp_hdr) | |
416 | return FLOW_DISSECT_RET_OUT_BAD; | |
417 | ||
418 | switch (PPP_PROTOCOL(ppp_hdr)) { | |
419 | case PPP_IP: | |
420 | *p_proto = htons(ETH_P_IP); | |
421 | break; | |
422 | case PPP_IPV6: | |
423 | *p_proto = htons(ETH_P_IPV6); | |
424 | break; | |
425 | default: | |
426 | /* Could probably catch some more like MPLS */ | |
427 | break; | |
428 | } | |
429 | ||
430 | offset += PPP_HDRLEN; | |
431 | } | |
432 | ||
433 | *p_nhoff += offset; | |
434 | key_control->flags |= FLOW_DIS_ENCAPSULATION; | |
435 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) | |
436 | return FLOW_DISSECT_RET_OUT_GOOD; | |
437 | ||
3a1214e8 | 438 | return FLOW_DISSECT_RET_PROTO_AGAIN; |
7c92de8e JP |
439 | } |
440 | ||
5b0890a9 SE |
441 | /** |
442 | * __skb_flow_dissect_batadv() - dissect batman-adv header | |
443 | * @skb: sk_buff to with the batman-adv header | |
444 | * @key_control: flow dissectors control key | |
445 | * @data: raw buffer pointer to the packet, if NULL use skb->data | |
446 | * @p_proto: pointer used to update the protocol to process next | |
447 | * @p_nhoff: pointer used to update inner network header offset | |
448 | * @hlen: packet header length | |
449 | * @flags: any combination of FLOW_DISSECTOR_F_* | |
450 | * | |
451 | * ETH_P_BATMAN packets are tried to be dissected. Only | |
452 | * &struct batadv_unicast packets are actually processed because they contain an | |
453 | * inner ethernet header and are usually followed by actual network header. This | |
454 | * allows the flow dissector to continue processing the packet. | |
455 | * | |
456 | * Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found, | |
457 | * FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation, | |
458 | * otherwise FLOW_DISSECT_RET_OUT_BAD | |
459 | */ | |
460 | static enum flow_dissect_ret | |
461 | __skb_flow_dissect_batadv(const struct sk_buff *skb, | |
462 | struct flow_dissector_key_control *key_control, | |
463 | void *data, __be16 *p_proto, int *p_nhoff, int hlen, | |
464 | unsigned int flags) | |
465 | { | |
466 | struct { | |
467 | struct batadv_unicast_packet batadv_unicast; | |
468 | struct ethhdr eth; | |
469 | } *hdr, _hdr; | |
470 | ||
471 | hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen, | |
472 | &_hdr); | |
473 | if (!hdr) | |
474 | return FLOW_DISSECT_RET_OUT_BAD; | |
475 | ||
476 | if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION) | |
477 | return FLOW_DISSECT_RET_OUT_BAD; | |
478 | ||
479 | if (hdr->batadv_unicast.packet_type != BATADV_UNICAST) | |
480 | return FLOW_DISSECT_RET_OUT_BAD; | |
481 | ||
482 | *p_proto = hdr->eth.h_proto; | |
483 | *p_nhoff += sizeof(*hdr); | |
484 | ||
485 | key_control->flags |= FLOW_DIS_ENCAPSULATION; | |
486 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) | |
487 | return FLOW_DISSECT_RET_OUT_GOOD; | |
488 | ||
489 | return FLOW_DISSECT_RET_PROTO_AGAIN; | |
490 | } | |
491 | ||
ac4bb5de JP |
492 | static void |
493 | __skb_flow_dissect_tcp(const struct sk_buff *skb, | |
494 | struct flow_dissector *flow_dissector, | |
495 | void *target_container, void *data, int thoff, int hlen) | |
496 | { | |
497 | struct flow_dissector_key_tcp *key_tcp; | |
498 | struct tcphdr *th, _th; | |
499 | ||
500 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP)) | |
501 | return; | |
502 | ||
503 | th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th); | |
504 | if (!th) | |
505 | return; | |
506 | ||
507 | if (unlikely(__tcp_hdrlen(th) < sizeof(_th))) | |
508 | return; | |
509 | ||
510 | key_tcp = skb_flow_dissector_target(flow_dissector, | |
511 | FLOW_DISSECTOR_KEY_TCP, | |
512 | target_container); | |
513 | key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF)); | |
514 | } | |
515 | ||
518d8a2e OG |
516 | static void |
517 | __skb_flow_dissect_ipv4(const struct sk_buff *skb, | |
518 | struct flow_dissector *flow_dissector, | |
519 | void *target_container, void *data, const struct iphdr *iph) | |
520 | { | |
521 | struct flow_dissector_key_ip *key_ip; | |
522 | ||
523 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP)) | |
524 | return; | |
525 | ||
526 | key_ip = skb_flow_dissector_target(flow_dissector, | |
527 | FLOW_DISSECTOR_KEY_IP, | |
528 | target_container); | |
529 | key_ip->tos = iph->tos; | |
530 | key_ip->ttl = iph->ttl; | |
531 | } | |
532 | ||
533 | static void | |
534 | __skb_flow_dissect_ipv6(const struct sk_buff *skb, | |
535 | struct flow_dissector *flow_dissector, | |
536 | void *target_container, void *data, const struct ipv6hdr *iph) | |
537 | { | |
538 | struct flow_dissector_key_ip *key_ip; | |
539 | ||
540 | if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP)) | |
541 | return; | |
542 | ||
543 | key_ip = skb_flow_dissector_target(flow_dissector, | |
544 | FLOW_DISSECTOR_KEY_IP, | |
545 | target_container); | |
546 | key_ip->tos = ipv6_get_dsfield(iph); | |
547 | key_ip->ttl = iph->hop_limit; | |
548 | } | |
549 | ||
1eed4dfb TH |
550 | /* Maximum number of protocol headers that can be parsed in |
551 | * __skb_flow_dissect | |
552 | */ | |
553 | #define MAX_FLOW_DISSECT_HDRS 15 | |
554 | ||
555 | static bool skb_flow_dissect_allowed(int *num_hdrs) | |
556 | { | |
557 | ++*num_hdrs; | |
558 | ||
559 | return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS); | |
560 | } | |
561 | ||
453a940e WC |
562 | /** |
563 | * __skb_flow_dissect - extract the flow_keys struct and return it | |
564 | * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified | |
06635a35 JP |
565 | * @flow_dissector: list of keys to dissect |
566 | * @target_container: target structure to put dissected values into | |
453a940e WC |
567 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
568 | * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol | |
569 | * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb) | |
570 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
571 | * | |
06635a35 JP |
572 | * The function will try to retrieve individual keys into target specified |
573 | * by flow_dissector from either the skbuff or a raw buffer specified by the | |
574 | * rest parameters. | |
575 | * | |
576 | * Caller must take care of zeroing target container memory. | |
453a940e | 577 | */ |
06635a35 JP |
578 | bool __skb_flow_dissect(const struct sk_buff *skb, |
579 | struct flow_dissector *flow_dissector, | |
580 | void *target_container, | |
cd79a238 TH |
581 | void *data, __be16 proto, int nhoff, int hlen, |
582 | unsigned int flags) | |
0744dd00 | 583 | { |
42aecaa9 | 584 | struct flow_dissector_key_control *key_control; |
06635a35 JP |
585 | struct flow_dissector_key_basic *key_basic; |
586 | struct flow_dissector_key_addrs *key_addrs; | |
587 | struct flow_dissector_key_ports *key_ports; | |
972d3876 | 588 | struct flow_dissector_key_icmp *key_icmp; |
d34af823 | 589 | struct flow_dissector_key_tags *key_tags; |
f6a66927 | 590 | struct flow_dissector_key_vlan *key_vlan; |
3a1214e8 | 591 | enum flow_dissect_ret fdret; |
d5709f7a | 592 | bool skip_vlan = false; |
1eed4dfb | 593 | int num_hdrs = 0; |
8e690ffd | 594 | u8 ip_proto = 0; |
34fad54c | 595 | bool ret; |
0744dd00 | 596 | |
690e36e7 DM |
597 | if (!data) { |
598 | data = skb->data; | |
d5709f7a HHZ |
599 | proto = skb_vlan_tag_present(skb) ? |
600 | skb->vlan_proto : skb->protocol; | |
453a940e | 601 | nhoff = skb_network_offset(skb); |
690e36e7 | 602 | hlen = skb_headlen(skb); |
2d571645 | 603 | #if IS_ENABLED(CONFIG_NET_DSA) |
7324157b | 604 | if (unlikely(skb->dev && netdev_uses_dsa(skb->dev))) { |
43e66528 JC |
605 | const struct dsa_device_ops *ops; |
606 | int offset; | |
607 | ||
608 | ops = skb->dev->dsa_ptr->tag_ops; | |
609 | if (ops->flow_dissect && | |
610 | !ops->flow_dissect(skb, &proto, &offset)) { | |
611 | hlen -= offset; | |
612 | nhoff += offset; | |
613 | } | |
614 | } | |
2d571645 | 615 | #endif |
690e36e7 DM |
616 | } |
617 | ||
42aecaa9 TH |
618 | /* It is ensured by skb_flow_dissector_init() that control key will |
619 | * be always present. | |
620 | */ | |
621 | key_control = skb_flow_dissector_target(flow_dissector, | |
622 | FLOW_DISSECTOR_KEY_CONTROL, | |
623 | target_container); | |
624 | ||
06635a35 JP |
625 | /* It is ensured by skb_flow_dissector_init() that basic key will |
626 | * be always present. | |
627 | */ | |
628 | key_basic = skb_flow_dissector_target(flow_dissector, | |
629 | FLOW_DISSECTOR_KEY_BASIC, | |
630 | target_container); | |
0744dd00 | 631 | |
20a17bf6 DM |
632 | if (dissector_uses_key(flow_dissector, |
633 | FLOW_DISSECTOR_KEY_ETH_ADDRS)) { | |
67a900cc JP |
634 | struct ethhdr *eth = eth_hdr(skb); |
635 | struct flow_dissector_key_eth_addrs *key_eth_addrs; | |
636 | ||
637 | key_eth_addrs = skb_flow_dissector_target(flow_dissector, | |
638 | FLOW_DISSECTOR_KEY_ETH_ADDRS, | |
639 | target_container); | |
640 | memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs)); | |
641 | } | |
642 | ||
c5ef188e | 643 | proto_again: |
3a1214e8 TH |
644 | fdret = FLOW_DISSECT_RET_CONTINUE; |
645 | ||
0744dd00 | 646 | switch (proto) { |
2b8837ae | 647 | case htons(ETH_P_IP): { |
0744dd00 ED |
648 | const struct iphdr *iph; |
649 | struct iphdr _iph; | |
3a1214e8 | 650 | |
690e36e7 | 651 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
3a1214e8 TH |
652 | if (!iph || iph->ihl < 5) { |
653 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
654 | break; | |
655 | } | |
656 | ||
3797d3e8 | 657 | nhoff += iph->ihl * 4; |
0744dd00 | 658 | |
3797d3e8 | 659 | ip_proto = iph->protocol; |
3797d3e8 | 660 | |
918c023f AD |
661 | if (dissector_uses_key(flow_dissector, |
662 | FLOW_DISSECTOR_KEY_IPV4_ADDRS)) { | |
663 | key_addrs = skb_flow_dissector_target(flow_dissector, | |
664 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
665 | target_container); | |
666 | ||
667 | memcpy(&key_addrs->v4addrs, &iph->saddr, | |
668 | sizeof(key_addrs->v4addrs)); | |
669 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
670 | } | |
807e165d TH |
671 | |
672 | if (ip_is_fragment(iph)) { | |
4b36993d | 673 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
807e165d TH |
674 | |
675 | if (iph->frag_off & htons(IP_OFFSET)) { | |
3a1214e8 TH |
676 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
677 | break; | |
807e165d | 678 | } else { |
4b36993d | 679 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
3a1214e8 TH |
680 | if (!(flags & |
681 | FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) { | |
682 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
683 | break; | |
684 | } | |
807e165d TH |
685 | } |
686 | } | |
687 | ||
518d8a2e OG |
688 | __skb_flow_dissect_ipv4(skb, flow_dissector, |
689 | target_container, data, iph); | |
690 | ||
3a1214e8 TH |
691 | if (flags & FLOW_DISSECTOR_F_STOP_AT_L3) { |
692 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
693 | break; | |
694 | } | |
8306b688 | 695 | |
0744dd00 ED |
696 | break; |
697 | } | |
2b8837ae | 698 | case htons(ETH_P_IPV6): { |
0744dd00 ED |
699 | const struct ipv6hdr *iph; |
700 | struct ipv6hdr _iph; | |
19469a87 | 701 | |
690e36e7 | 702 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
3a1214e8 TH |
703 | if (!iph) { |
704 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
705 | break; | |
706 | } | |
0744dd00 ED |
707 | |
708 | ip_proto = iph->nexthdr; | |
0744dd00 | 709 | nhoff += sizeof(struct ipv6hdr); |
19469a87 | 710 | |
20a17bf6 DM |
711 | if (dissector_uses_key(flow_dissector, |
712 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
b3c3106c AD |
713 | key_addrs = skb_flow_dissector_target(flow_dissector, |
714 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
715 | target_container); | |
5af7fb6e | 716 | |
b3c3106c AD |
717 | memcpy(&key_addrs->v6addrs, &iph->saddr, |
718 | sizeof(key_addrs->v6addrs)); | |
c3f83241 | 719 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; |
b924933c | 720 | } |
87ee9e52 | 721 | |
461547f3 AD |
722 | if ((dissector_uses_key(flow_dissector, |
723 | FLOW_DISSECTOR_KEY_FLOW_LABEL) || | |
724 | (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) && | |
725 | ip6_flowlabel(iph)) { | |
726 | __be32 flow_label = ip6_flowlabel(iph); | |
727 | ||
20a17bf6 DM |
728 | if (dissector_uses_key(flow_dissector, |
729 | FLOW_DISSECTOR_KEY_FLOW_LABEL)) { | |
87ee9e52 TH |
730 | key_tags = skb_flow_dissector_target(flow_dissector, |
731 | FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
732 | target_container); | |
733 | key_tags->flow_label = ntohl(flow_label); | |
12c227ec | 734 | } |
3a1214e8 TH |
735 | if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) { |
736 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
737 | break; | |
738 | } | |
19469a87 TH |
739 | } |
740 | ||
518d8a2e OG |
741 | __skb_flow_dissect_ipv6(skb, flow_dissector, |
742 | target_container, data, iph); | |
743 | ||
8306b688 | 744 | if (flags & FLOW_DISSECTOR_F_STOP_AT_L3) |
3a1214e8 | 745 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
8306b688 | 746 | |
0744dd00 ED |
747 | break; |
748 | } | |
2b8837ae JP |
749 | case htons(ETH_P_8021AD): |
750 | case htons(ETH_P_8021Q): { | |
0744dd00 | 751 | const struct vlan_hdr *vlan; |
bc72f3dd AB |
752 | struct vlan_hdr _vlan; |
753 | bool vlan_tag_present = skb && skb_vlan_tag_present(skb); | |
0744dd00 | 754 | |
bc72f3dd | 755 | if (vlan_tag_present) |
d5709f7a HHZ |
756 | proto = skb->protocol; |
757 | ||
bc72f3dd | 758 | if (!vlan_tag_present || eth_type_vlan(skb->protocol)) { |
d5709f7a HHZ |
759 | vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), |
760 | data, hlen, &_vlan); | |
3a1214e8 TH |
761 | if (!vlan) { |
762 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
763 | break; | |
764 | } | |
765 | ||
d5709f7a HHZ |
766 | proto = vlan->h_vlan_encapsulated_proto; |
767 | nhoff += sizeof(*vlan); | |
3a1214e8 TH |
768 | if (skip_vlan) { |
769 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
770 | break; | |
771 | } | |
d5709f7a | 772 | } |
0744dd00 | 773 | |
d5709f7a | 774 | skip_vlan = true; |
20a17bf6 | 775 | if (dissector_uses_key(flow_dissector, |
f6a66927 HHZ |
776 | FLOW_DISSECTOR_KEY_VLAN)) { |
777 | key_vlan = skb_flow_dissector_target(flow_dissector, | |
778 | FLOW_DISSECTOR_KEY_VLAN, | |
d34af823 TH |
779 | target_container); |
780 | ||
bc72f3dd | 781 | if (vlan_tag_present) { |
f6a66927 HHZ |
782 | key_vlan->vlan_id = skb_vlan_tag_get_id(skb); |
783 | key_vlan->vlan_priority = | |
784 | (skb_vlan_tag_get_prio(skb) >> VLAN_PRIO_SHIFT); | |
785 | } else { | |
786 | key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) & | |
d5709f7a | 787 | VLAN_VID_MASK; |
f6a66927 HHZ |
788 | key_vlan->vlan_priority = |
789 | (ntohs(vlan->h_vlan_TCI) & | |
790 | VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT; | |
791 | } | |
d34af823 TH |
792 | } |
793 | ||
3a1214e8 TH |
794 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; |
795 | break; | |
0744dd00 | 796 | } |
2b8837ae | 797 | case htons(ETH_P_PPP_SES): { |
0744dd00 ED |
798 | struct { |
799 | struct pppoe_hdr hdr; | |
800 | __be16 proto; | |
801 | } *hdr, _hdr; | |
690e36e7 | 802 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
3a1214e8 TH |
803 | if (!hdr) { |
804 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
805 | break; | |
806 | } | |
807 | ||
0744dd00 ED |
808 | proto = hdr->proto; |
809 | nhoff += PPPOE_SES_HLEN; | |
810 | switch (proto) { | |
2b8837ae | 811 | case htons(PPP_IP): |
3a1214e8 TH |
812 | proto = htons(ETH_P_IP); |
813 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
814 | break; | |
2b8837ae | 815 | case htons(PPP_IPV6): |
3a1214e8 TH |
816 | proto = htons(ETH_P_IPV6); |
817 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
818 | break; | |
0744dd00 | 819 | default: |
3a1214e8 TH |
820 | fdret = FLOW_DISSECT_RET_OUT_BAD; |
821 | break; | |
0744dd00 | 822 | } |
3a1214e8 | 823 | break; |
0744dd00 | 824 | } |
08bfc9cb | 825 | case htons(ETH_P_TIPC): { |
8d6e79d3 JM |
826 | struct tipc_basic_hdr *hdr, _hdr; |
827 | ||
828 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), | |
829 | data, hlen, &_hdr); | |
3a1214e8 TH |
830 | if (!hdr) { |
831 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
832 | break; | |
833 | } | |
06635a35 | 834 | |
20a17bf6 | 835 | if (dissector_uses_key(flow_dissector, |
8d6e79d3 | 836 | FLOW_DISSECTOR_KEY_TIPC)) { |
06635a35 | 837 | key_addrs = skb_flow_dissector_target(flow_dissector, |
8d6e79d3 | 838 | FLOW_DISSECTOR_KEY_TIPC, |
06635a35 | 839 | target_container); |
8d6e79d3 JM |
840 | key_addrs->tipckey.key = tipc_hdr_rps_key(hdr); |
841 | key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC; | |
06635a35 | 842 | } |
3a1214e8 TH |
843 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
844 | break; | |
08bfc9cb | 845 | } |
b3baa0fb TH |
846 | |
847 | case htons(ETH_P_MPLS_UC): | |
4a5d6c8b | 848 | case htons(ETH_P_MPLS_MC): |
3a1214e8 | 849 | fdret = __skb_flow_dissect_mpls(skb, flow_dissector, |
4a5d6c8b | 850 | target_container, data, |
3a1214e8 TH |
851 | nhoff, hlen); |
852 | break; | |
56193d1b | 853 | case htons(ETH_P_FCOE): |
3a1214e8 TH |
854 | if ((hlen - nhoff) < FCOE_HEADER_LEN) { |
855 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
856 | break; | |
857 | } | |
224516b3 AD |
858 | |
859 | nhoff += FCOE_HEADER_LEN; | |
3a1214e8 TH |
860 | fdret = FLOW_DISSECT_RET_OUT_GOOD; |
861 | break; | |
55733350 SH |
862 | |
863 | case htons(ETH_P_ARP): | |
9bf881ff | 864 | case htons(ETH_P_RARP): |
3a1214e8 | 865 | fdret = __skb_flow_dissect_arp(skb, flow_dissector, |
9bf881ff | 866 | target_container, data, |
3a1214e8 TH |
867 | nhoff, hlen); |
868 | break; | |
869 | ||
5b0890a9 SE |
870 | case htons(ETH_P_BATMAN): |
871 | fdret = __skb_flow_dissect_batadv(skb, key_control, data, | |
872 | &proto, &nhoff, hlen, flags); | |
873 | break; | |
874 | ||
3a1214e8 TH |
875 | default: |
876 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
877 | break; | |
878 | } | |
879 | ||
880 | /* Process result of proto processing */ | |
881 | switch (fdret) { | |
882 | case FLOW_DISSECT_RET_OUT_GOOD: | |
883 | goto out_good; | |
884 | case FLOW_DISSECT_RET_PROTO_AGAIN: | |
1eed4dfb TH |
885 | if (skb_flow_dissect_allowed(&num_hdrs)) |
886 | goto proto_again; | |
887 | goto out_good; | |
3a1214e8 TH |
888 | case FLOW_DISSECT_RET_CONTINUE: |
889 | case FLOW_DISSECT_RET_IPPROTO_AGAIN: | |
890 | break; | |
891 | case FLOW_DISSECT_RET_OUT_BAD: | |
0744dd00 | 892 | default: |
a6e544b0 | 893 | goto out_bad; |
0744dd00 ED |
894 | } |
895 | ||
6a74fcf4 | 896 | ip_proto_again: |
3a1214e8 TH |
897 | fdret = FLOW_DISSECT_RET_CONTINUE; |
898 | ||
0744dd00 | 899 | switch (ip_proto) { |
7c92de8e | 900 | case IPPROTO_GRE: |
3a1214e8 | 901 | fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector, |
7c92de8e | 902 | target_container, data, |
3a1214e8 TH |
903 | &proto, &nhoff, &hlen, flags); |
904 | break; | |
905 | ||
6a74fcf4 TH |
906 | case NEXTHDR_HOP: |
907 | case NEXTHDR_ROUTING: | |
908 | case NEXTHDR_DEST: { | |
909 | u8 _opthdr[2], *opthdr; | |
910 | ||
911 | if (proto != htons(ETH_P_IPV6)) | |
912 | break; | |
913 | ||
914 | opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr), | |
915 | data, hlen, &_opthdr); | |
3a1214e8 TH |
916 | if (!opthdr) { |
917 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
918 | break; | |
919 | } | |
6a74fcf4 | 920 | |
1e98a0f0 ED |
921 | ip_proto = opthdr[0]; |
922 | nhoff += (opthdr[1] + 1) << 3; | |
6a74fcf4 | 923 | |
3a1214e8 TH |
924 | fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN; |
925 | break; | |
6a74fcf4 | 926 | } |
b840f28b TH |
927 | case NEXTHDR_FRAGMENT: { |
928 | struct frag_hdr _fh, *fh; | |
929 | ||
930 | if (proto != htons(ETH_P_IPV6)) | |
931 | break; | |
932 | ||
933 | fh = __skb_header_pointer(skb, nhoff, sizeof(_fh), | |
934 | data, hlen, &_fh); | |
935 | ||
3a1214e8 TH |
936 | if (!fh) { |
937 | fdret = FLOW_DISSECT_RET_OUT_BAD; | |
938 | break; | |
939 | } | |
b840f28b | 940 | |
4b36993d | 941 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
b840f28b TH |
942 | |
943 | nhoff += sizeof(_fh); | |
43d2ccb3 | 944 | ip_proto = fh->nexthdr; |
b840f28b TH |
945 | |
946 | if (!(fh->frag_off & htons(IP6_OFFSET))) { | |
4b36993d | 947 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
3a1214e8 TH |
948 | if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) { |
949 | fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN; | |
950 | break; | |
951 | } | |
b840f28b | 952 | } |
3a1214e8 TH |
953 | |
954 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
955 | break; | |
b840f28b | 956 | } |
0744dd00 | 957 | case IPPROTO_IPIP: |
fca41895 | 958 | proto = htons(ETH_P_IP); |
823b9693 | 959 | |
4b36993d | 960 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
3a1214e8 TH |
961 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) { |
962 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
963 | break; | |
964 | } | |
965 | ||
966 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
967 | break; | |
823b9693 | 968 | |
b438f940 TH |
969 | case IPPROTO_IPV6: |
970 | proto = htons(ETH_P_IPV6); | |
823b9693 | 971 | |
4b36993d | 972 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
3a1214e8 TH |
973 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) { |
974 | fdret = FLOW_DISSECT_RET_OUT_GOOD; | |
975 | break; | |
976 | } | |
977 | ||
978 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; | |
979 | break; | |
980 | ||
823b9693 | 981 | |
b3baa0fb TH |
982 | case IPPROTO_MPLS: |
983 | proto = htons(ETH_P_MPLS_UC); | |
3a1214e8 TH |
984 | fdret = FLOW_DISSECT_RET_PROTO_AGAIN; |
985 | break; | |
986 | ||
ac4bb5de JP |
987 | case IPPROTO_TCP: |
988 | __skb_flow_dissect_tcp(skb, flow_dissector, target_container, | |
989 | data, nhoff, hlen); | |
990 | break; | |
3a1214e8 | 991 | |
0744dd00 ED |
992 | default: |
993 | break; | |
994 | } | |
995 | ||
20a17bf6 DM |
996 | if (dissector_uses_key(flow_dissector, |
997 | FLOW_DISSECTOR_KEY_PORTS)) { | |
06635a35 JP |
998 | key_ports = skb_flow_dissector_target(flow_dissector, |
999 | FLOW_DISSECTOR_KEY_PORTS, | |
1000 | target_container); | |
1001 | key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto, | |
1002 | data, hlen); | |
1003 | } | |
5af7fb6e | 1004 | |
972d3876 SH |
1005 | if (dissector_uses_key(flow_dissector, |
1006 | FLOW_DISSECTOR_KEY_ICMP)) { | |
1007 | key_icmp = skb_flow_dissector_target(flow_dissector, | |
1008 | FLOW_DISSECTOR_KEY_ICMP, | |
1009 | target_container); | |
1010 | key_icmp->icmp = skb_flow_get_be16(skb, nhoff, data, hlen); | |
1011 | } | |
1012 | ||
3a1214e8 TH |
1013 | /* Process result of IP proto processing */ |
1014 | switch (fdret) { | |
1015 | case FLOW_DISSECT_RET_PROTO_AGAIN: | |
1eed4dfb TH |
1016 | if (skb_flow_dissect_allowed(&num_hdrs)) |
1017 | goto proto_again; | |
1018 | break; | |
3a1214e8 | 1019 | case FLOW_DISSECT_RET_IPPROTO_AGAIN: |
1eed4dfb TH |
1020 | if (skb_flow_dissect_allowed(&num_hdrs)) |
1021 | goto ip_proto_again; | |
1022 | break; | |
3a1214e8 TH |
1023 | case FLOW_DISSECT_RET_OUT_GOOD: |
1024 | case FLOW_DISSECT_RET_CONTINUE: | |
1025 | break; | |
1026 | case FLOW_DISSECT_RET_OUT_BAD: | |
1027 | default: | |
1028 | goto out_bad; | |
1029 | } | |
1030 | ||
a6e544b0 TH |
1031 | out_good: |
1032 | ret = true; | |
1033 | ||
34fad54c | 1034 | out: |
d0c081b4 | 1035 | key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen); |
a6e544b0 TH |
1036 | key_basic->n_proto = proto; |
1037 | key_basic->ip_proto = ip_proto; | |
a6e544b0 TH |
1038 | |
1039 | return ret; | |
34fad54c ED |
1040 | |
1041 | out_bad: | |
1042 | ret = false; | |
34fad54c | 1043 | goto out; |
0744dd00 | 1044 | } |
690e36e7 | 1045 | EXPORT_SYMBOL(__skb_flow_dissect); |
441d9d32 CW |
1046 | |
1047 | static u32 hashrnd __read_mostly; | |
66415cf8 HFS |
1048 | static __always_inline void __flow_hash_secret_init(void) |
1049 | { | |
1050 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
1051 | } | |
1052 | ||
20a17bf6 DM |
1053 | static __always_inline u32 __flow_hash_words(const u32 *words, u32 length, |
1054 | u32 keyval) | |
42aecaa9 TH |
1055 | { |
1056 | return jhash2(words, length, keyval); | |
1057 | } | |
1058 | ||
20a17bf6 | 1059 | static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow) |
66415cf8 | 1060 | { |
20a17bf6 DM |
1061 | const void *p = flow; |
1062 | ||
42aecaa9 | 1063 | BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32)); |
20a17bf6 | 1064 | return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET); |
42aecaa9 TH |
1065 | } |
1066 | ||
20a17bf6 | 1067 | static inline size_t flow_keys_hash_length(const struct flow_keys *flow) |
42aecaa9 | 1068 | { |
c3f83241 | 1069 | size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs); |
42aecaa9 | 1070 | BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32)); |
c3f83241 TH |
1071 | BUILD_BUG_ON(offsetof(typeof(*flow), addrs) != |
1072 | sizeof(*flow) - sizeof(flow->addrs)); | |
1073 | ||
1074 | switch (flow->control.addr_type) { | |
1075 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1076 | diff -= sizeof(flow->addrs.v4addrs); | |
1077 | break; | |
1078 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1079 | diff -= sizeof(flow->addrs.v6addrs); | |
1080 | break; | |
8d6e79d3 JM |
1081 | case FLOW_DISSECTOR_KEY_TIPC: |
1082 | diff -= sizeof(flow->addrs.tipckey); | |
9f249089 | 1083 | break; |
c3f83241 TH |
1084 | } |
1085 | return (sizeof(*flow) - diff) / sizeof(u32); | |
1086 | } | |
1087 | ||
1088 | __be32 flow_get_u32_src(const struct flow_keys *flow) | |
1089 | { | |
1090 | switch (flow->control.addr_type) { | |
1091 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1092 | return flow->addrs.v4addrs.src; | |
1093 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1094 | return (__force __be32)ipv6_addr_hash( | |
1095 | &flow->addrs.v6addrs.src); | |
8d6e79d3 JM |
1096 | case FLOW_DISSECTOR_KEY_TIPC: |
1097 | return flow->addrs.tipckey.key; | |
c3f83241 TH |
1098 | default: |
1099 | return 0; | |
1100 | } | |
1101 | } | |
1102 | EXPORT_SYMBOL(flow_get_u32_src); | |
1103 | ||
1104 | __be32 flow_get_u32_dst(const struct flow_keys *flow) | |
1105 | { | |
1106 | switch (flow->control.addr_type) { | |
1107 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1108 | return flow->addrs.v4addrs.dst; | |
1109 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1110 | return (__force __be32)ipv6_addr_hash( | |
1111 | &flow->addrs.v6addrs.dst); | |
1112 | default: | |
1113 | return 0; | |
1114 | } | |
1115 | } | |
1116 | EXPORT_SYMBOL(flow_get_u32_dst); | |
1117 | ||
1118 | static inline void __flow_hash_consistentify(struct flow_keys *keys) | |
1119 | { | |
1120 | int addr_diff, i; | |
1121 | ||
1122 | switch (keys->control.addr_type) { | |
1123 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
1124 | addr_diff = (__force u32)keys->addrs.v4addrs.dst - | |
1125 | (__force u32)keys->addrs.v4addrs.src; | |
1126 | if ((addr_diff < 0) || | |
1127 | (addr_diff == 0 && | |
1128 | ((__force u16)keys->ports.dst < | |
1129 | (__force u16)keys->ports.src))) { | |
1130 | swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst); | |
1131 | swap(keys->ports.src, keys->ports.dst); | |
1132 | } | |
1133 | break; | |
1134 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
1135 | addr_diff = memcmp(&keys->addrs.v6addrs.dst, | |
1136 | &keys->addrs.v6addrs.src, | |
1137 | sizeof(keys->addrs.v6addrs.dst)); | |
1138 | if ((addr_diff < 0) || | |
1139 | (addr_diff == 0 && | |
1140 | ((__force u16)keys->ports.dst < | |
1141 | (__force u16)keys->ports.src))) { | |
1142 | for (i = 0; i < 4; i++) | |
1143 | swap(keys->addrs.v6addrs.src.s6_addr32[i], | |
1144 | keys->addrs.v6addrs.dst.s6_addr32[i]); | |
1145 | swap(keys->ports.src, keys->ports.dst); | |
1146 | } | |
1147 | break; | |
1148 | } | |
66415cf8 HFS |
1149 | } |
1150 | ||
50fb7992 | 1151 | static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval) |
5ed20a68 TH |
1152 | { |
1153 | u32 hash; | |
1154 | ||
c3f83241 | 1155 | __flow_hash_consistentify(keys); |
5ed20a68 | 1156 | |
20a17bf6 | 1157 | hash = __flow_hash_words(flow_keys_hash_start(keys), |
42aecaa9 | 1158 | flow_keys_hash_length(keys), keyval); |
5ed20a68 TH |
1159 | if (!hash) |
1160 | hash = 1; | |
1161 | ||
1162 | return hash; | |
1163 | } | |
1164 | ||
1165 | u32 flow_hash_from_keys(struct flow_keys *keys) | |
1166 | { | |
50fb7992 TH |
1167 | __flow_hash_secret_init(); |
1168 | return __flow_hash_from_keys(keys, hashrnd); | |
5ed20a68 TH |
1169 | } |
1170 | EXPORT_SYMBOL(flow_hash_from_keys); | |
1171 | ||
50fb7992 TH |
1172 | static inline u32 ___skb_get_hash(const struct sk_buff *skb, |
1173 | struct flow_keys *keys, u32 keyval) | |
1174 | { | |
6db61d79 TH |
1175 | skb_flow_dissect_flow_keys(skb, keys, |
1176 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
50fb7992 TH |
1177 | |
1178 | return __flow_hash_from_keys(keys, keyval); | |
1179 | } | |
1180 | ||
2f59e1eb TH |
1181 | struct _flow_keys_digest_data { |
1182 | __be16 n_proto; | |
1183 | u8 ip_proto; | |
1184 | u8 padding; | |
1185 | __be32 ports; | |
1186 | __be32 src; | |
1187 | __be32 dst; | |
1188 | }; | |
1189 | ||
1190 | void make_flow_keys_digest(struct flow_keys_digest *digest, | |
1191 | const struct flow_keys *flow) | |
1192 | { | |
1193 | struct _flow_keys_digest_data *data = | |
1194 | (struct _flow_keys_digest_data *)digest; | |
1195 | ||
1196 | BUILD_BUG_ON(sizeof(*data) > sizeof(*digest)); | |
1197 | ||
1198 | memset(digest, 0, sizeof(*digest)); | |
1199 | ||
06635a35 JP |
1200 | data->n_proto = flow->basic.n_proto; |
1201 | data->ip_proto = flow->basic.ip_proto; | |
1202 | data->ports = flow->ports.ports; | |
c3f83241 TH |
1203 | data->src = flow->addrs.v4addrs.src; |
1204 | data->dst = flow->addrs.v4addrs.dst; | |
2f59e1eb TH |
1205 | } |
1206 | EXPORT_SYMBOL(make_flow_keys_digest); | |
1207 | ||
eb70db87 DM |
1208 | static struct flow_dissector flow_keys_dissector_symmetric __read_mostly; |
1209 | ||
b917783c | 1210 | u32 __skb_get_hash_symmetric(const struct sk_buff *skb) |
eb70db87 DM |
1211 | { |
1212 | struct flow_keys keys; | |
1213 | ||
1214 | __flow_hash_secret_init(); | |
1215 | ||
1216 | memset(&keys, 0, sizeof(keys)); | |
1217 | __skb_flow_dissect(skb, &flow_keys_dissector_symmetric, &keys, | |
1218 | NULL, 0, 0, 0, | |
1219 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
1220 | ||
1221 | return __flow_hash_from_keys(&keys, hashrnd); | |
1222 | } | |
1223 | EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric); | |
1224 | ||
d4fd3275 JP |
1225 | /** |
1226 | * __skb_get_hash: calculate a flow hash | |
1227 | * @skb: sk_buff to calculate flow hash from | |
1228 | * | |
1229 | * This function calculates a flow hash based on src/dst addresses | |
61b905da TH |
1230 | * and src/dst port numbers. Sets hash in skb to non-zero hash value |
1231 | * on success, zero indicates no valid hash. Also, sets l4_hash in skb | |
441d9d32 CW |
1232 | * if hash is a canonical 4-tuple hash over transport ports. |
1233 | */ | |
3958afa1 | 1234 | void __skb_get_hash(struct sk_buff *skb) |
441d9d32 CW |
1235 | { |
1236 | struct flow_keys keys; | |
635c223c | 1237 | u32 hash; |
441d9d32 | 1238 | |
50fb7992 TH |
1239 | __flow_hash_secret_init(); |
1240 | ||
635c223c GF |
1241 | hash = ___skb_get_hash(skb, &keys, hashrnd); |
1242 | ||
1243 | __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys)); | |
441d9d32 | 1244 | } |
3958afa1 | 1245 | EXPORT_SYMBOL(__skb_get_hash); |
441d9d32 | 1246 | |
50fb7992 TH |
1247 | __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb) |
1248 | { | |
1249 | struct flow_keys keys; | |
1250 | ||
1251 | return ___skb_get_hash(skb, &keys, perturb); | |
1252 | } | |
1253 | EXPORT_SYMBOL(skb_get_hash_perturb); | |
1254 | ||
56193d1b | 1255 | u32 __skb_get_poff(const struct sk_buff *skb, void *data, |
72a338bc | 1256 | const struct flow_keys_basic *keys, int hlen) |
f77668dc | 1257 | { |
42aecaa9 | 1258 | u32 poff = keys->control.thoff; |
f77668dc | 1259 | |
43d2ccb3 AD |
1260 | /* skip L4 headers for fragments after the first */ |
1261 | if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) && | |
1262 | !(keys->control.flags & FLOW_DIS_FIRST_FRAG)) | |
1263 | return poff; | |
1264 | ||
06635a35 | 1265 | switch (keys->basic.ip_proto) { |
f77668dc | 1266 | case IPPROTO_TCP: { |
5af7fb6e AD |
1267 | /* access doff as u8 to avoid unaligned access */ |
1268 | const u8 *doff; | |
1269 | u8 _doff; | |
f77668dc | 1270 | |
5af7fb6e AD |
1271 | doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff), |
1272 | data, hlen, &_doff); | |
1273 | if (!doff) | |
f77668dc DB |
1274 | return poff; |
1275 | ||
5af7fb6e | 1276 | poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2); |
f77668dc DB |
1277 | break; |
1278 | } | |
1279 | case IPPROTO_UDP: | |
1280 | case IPPROTO_UDPLITE: | |
1281 | poff += sizeof(struct udphdr); | |
1282 | break; | |
1283 | /* For the rest, we do not really care about header | |
1284 | * extensions at this point for now. | |
1285 | */ | |
1286 | case IPPROTO_ICMP: | |
1287 | poff += sizeof(struct icmphdr); | |
1288 | break; | |
1289 | case IPPROTO_ICMPV6: | |
1290 | poff += sizeof(struct icmp6hdr); | |
1291 | break; | |
1292 | case IPPROTO_IGMP: | |
1293 | poff += sizeof(struct igmphdr); | |
1294 | break; | |
1295 | case IPPROTO_DCCP: | |
1296 | poff += sizeof(struct dccp_hdr); | |
1297 | break; | |
1298 | case IPPROTO_SCTP: | |
1299 | poff += sizeof(struct sctphdr); | |
1300 | break; | |
1301 | } | |
1302 | ||
1303 | return poff; | |
1304 | } | |
1305 | ||
0db89b8b JP |
1306 | /** |
1307 | * skb_get_poff - get the offset to the payload | |
1308 | * @skb: sk_buff to get the payload offset from | |
1309 | * | |
1310 | * The function will get the offset to the payload as far as it could | |
1311 | * be dissected. The main user is currently BPF, so that we can dynamically | |
56193d1b AD |
1312 | * truncate packets without needing to push actual payload to the user |
1313 | * space and can analyze headers only, instead. | |
1314 | */ | |
1315 | u32 skb_get_poff(const struct sk_buff *skb) | |
1316 | { | |
72a338bc | 1317 | struct flow_keys_basic keys; |
56193d1b | 1318 | |
d869dea6 | 1319 | if (!skb_flow_dissect_flow_keys_basic(skb, &keys, NULL, 0, 0, 0, 0)) |
56193d1b AD |
1320 | return 0; |
1321 | ||
1322 | return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb)); | |
1323 | } | |
06635a35 | 1324 | |
20a17bf6 | 1325 | __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys) |
a17ace95 DM |
1326 | { |
1327 | memset(keys, 0, sizeof(*keys)); | |
1328 | ||
1329 | memcpy(&keys->addrs.v6addrs.src, &fl6->saddr, | |
1330 | sizeof(keys->addrs.v6addrs.src)); | |
1331 | memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr, | |
1332 | sizeof(keys->addrs.v6addrs.dst)); | |
1333 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
1334 | keys->ports.src = fl6->fl6_sport; | |
1335 | keys->ports.dst = fl6->fl6_dport; | |
1336 | keys->keyid.keyid = fl6->fl6_gre_key; | |
fa1be7e0 | 1337 | keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
a17ace95 DM |
1338 | keys->basic.ip_proto = fl6->flowi6_proto; |
1339 | ||
1340 | return flow_hash_from_keys(keys); | |
1341 | } | |
1342 | EXPORT_SYMBOL(__get_hash_from_flowi6); | |
1343 | ||
06635a35 | 1344 | static const struct flow_dissector_key flow_keys_dissector_keys[] = { |
42aecaa9 TH |
1345 | { |
1346 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
1347 | .offset = offsetof(struct flow_keys, control), | |
1348 | }, | |
06635a35 JP |
1349 | { |
1350 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
1351 | .offset = offsetof(struct flow_keys, basic), | |
1352 | }, | |
1353 | { | |
1354 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
c3f83241 TH |
1355 | .offset = offsetof(struct flow_keys, addrs.v4addrs), |
1356 | }, | |
1357 | { | |
1358 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
1359 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
06635a35 | 1360 | }, |
9f249089 | 1361 | { |
8d6e79d3 JM |
1362 | .key_id = FLOW_DISSECTOR_KEY_TIPC, |
1363 | .offset = offsetof(struct flow_keys, addrs.tipckey), | |
9f249089 | 1364 | }, |
06635a35 JP |
1365 | { |
1366 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
1367 | .offset = offsetof(struct flow_keys, ports), | |
1368 | }, | |
d34af823 | 1369 | { |
f6a66927 HHZ |
1370 | .key_id = FLOW_DISSECTOR_KEY_VLAN, |
1371 | .offset = offsetof(struct flow_keys, vlan), | |
d34af823 | 1372 | }, |
87ee9e52 TH |
1373 | { |
1374 | .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
1375 | .offset = offsetof(struct flow_keys, tags), | |
1376 | }, | |
1fdd512c TH |
1377 | { |
1378 | .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, | |
1379 | .offset = offsetof(struct flow_keys, keyid), | |
1380 | }, | |
06635a35 JP |
1381 | }; |
1382 | ||
eb70db87 DM |
1383 | static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = { |
1384 | { | |
1385 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
1386 | .offset = offsetof(struct flow_keys, control), | |
1387 | }, | |
1388 | { | |
1389 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
1390 | .offset = offsetof(struct flow_keys, basic), | |
1391 | }, | |
1392 | { | |
1393 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
1394 | .offset = offsetof(struct flow_keys, addrs.v4addrs), | |
1395 | }, | |
1396 | { | |
1397 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
1398 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
1399 | }, | |
1400 | { | |
1401 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
1402 | .offset = offsetof(struct flow_keys, ports), | |
1403 | }, | |
1404 | }; | |
1405 | ||
72a338bc | 1406 | static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = { |
42aecaa9 TH |
1407 | { |
1408 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
1409 | .offset = offsetof(struct flow_keys, control), | |
1410 | }, | |
06635a35 JP |
1411 | { |
1412 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
1413 | .offset = offsetof(struct flow_keys, basic), | |
1414 | }, | |
1415 | }; | |
1416 | ||
1417 | struct flow_dissector flow_keys_dissector __read_mostly; | |
1418 | EXPORT_SYMBOL(flow_keys_dissector); | |
1419 | ||
72a338bc PA |
1420 | struct flow_dissector flow_keys_basic_dissector __read_mostly; |
1421 | EXPORT_SYMBOL(flow_keys_basic_dissector); | |
06635a35 JP |
1422 | |
1423 | static int __init init_default_flow_dissectors(void) | |
1424 | { | |
1425 | skb_flow_dissector_init(&flow_keys_dissector, | |
1426 | flow_keys_dissector_keys, | |
1427 | ARRAY_SIZE(flow_keys_dissector_keys)); | |
eb70db87 DM |
1428 | skb_flow_dissector_init(&flow_keys_dissector_symmetric, |
1429 | flow_keys_dissector_symmetric_keys, | |
1430 | ARRAY_SIZE(flow_keys_dissector_symmetric_keys)); | |
72a338bc PA |
1431 | skb_flow_dissector_init(&flow_keys_basic_dissector, |
1432 | flow_keys_basic_dissector_keys, | |
1433 | ARRAY_SIZE(flow_keys_basic_dissector_keys)); | |
06635a35 JP |
1434 | return 0; |
1435 | } | |
1436 | ||
c9b8af13 | 1437 | core_initcall(init_default_flow_dissectors); |