Commit | Line | Data |
---|---|---|
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> | |
7 | #include <net/ip.h> | |
ddbe5032 | 8 | #include <net/ipv6.h> |
f77668dc DB |
9 | #include <linux/igmp.h> |
10 | #include <linux/icmp.h> | |
11 | #include <linux/sctp.h> | |
12 | #include <linux/dccp.h> | |
0744dd00 ED |
13 | #include <linux/if_tunnel.h> |
14 | #include <linux/if_pppox.h> | |
15 | #include <linux/ppp_defs.h> | |
06635a35 | 16 | #include <linux/stddef.h> |
67a900cc | 17 | #include <linux/if_ether.h> |
b3baa0fb | 18 | #include <linux/mpls.h> |
1bd758eb | 19 | #include <net/flow_dissector.h> |
56193d1b | 20 | #include <scsi/fc/fc_fcoe.h> |
0744dd00 | 21 | |
fbff949e JP |
22 | static bool skb_flow_dissector_uses_key(struct flow_dissector *flow_dissector, |
23 | enum flow_dissector_key_id key_id) | |
24 | { | |
25 | return flow_dissector->used_keys & (1 << key_id); | |
26 | } | |
27 | ||
28 | static void skb_flow_dissector_set_key(struct flow_dissector *flow_dissector, | |
29 | enum flow_dissector_key_id key_id) | |
30 | { | |
31 | flow_dissector->used_keys |= (1 << key_id); | |
32 | } | |
33 | ||
34 | static void *skb_flow_dissector_target(struct flow_dissector *flow_dissector, | |
35 | enum flow_dissector_key_id key_id, | |
36 | void *target_container) | |
37 | { | |
38 | return ((char *) target_container) + flow_dissector->offset[key_id]; | |
39 | } | |
40 | ||
41 | void skb_flow_dissector_init(struct flow_dissector *flow_dissector, | |
42 | const struct flow_dissector_key *key, | |
43 | unsigned int key_count) | |
44 | { | |
45 | unsigned int i; | |
46 | ||
47 | memset(flow_dissector, 0, sizeof(*flow_dissector)); | |
48 | ||
49 | for (i = 0; i < key_count; i++, key++) { | |
50 | /* User should make sure that every key target offset is withing | |
51 | * boundaries of unsigned short. | |
52 | */ | |
53 | BUG_ON(key->offset > USHRT_MAX); | |
54 | BUG_ON(skb_flow_dissector_uses_key(flow_dissector, | |
55 | key->key_id)); | |
56 | ||
57 | skb_flow_dissector_set_key(flow_dissector, key->key_id); | |
58 | flow_dissector->offset[key->key_id] = key->offset; | |
59 | } | |
60 | ||
42aecaa9 TH |
61 | /* Ensure that the dissector always includes control and basic key. |
62 | * That way we are able to avoid handling lack of these in fast path. | |
fbff949e | 63 | */ |
42aecaa9 TH |
64 | BUG_ON(!skb_flow_dissector_uses_key(flow_dissector, |
65 | FLOW_DISSECTOR_KEY_CONTROL)); | |
fbff949e JP |
66 | BUG_ON(!skb_flow_dissector_uses_key(flow_dissector, |
67 | FLOW_DISSECTOR_KEY_BASIC)); | |
68 | } | |
69 | EXPORT_SYMBOL(skb_flow_dissector_init); | |
70 | ||
357afe9c | 71 | /** |
6451b3f5 WC |
72 | * __skb_flow_get_ports - extract the upper layer ports and return them |
73 | * @skb: sk_buff to extract the ports from | |
357afe9c NA |
74 | * @thoff: transport header offset |
75 | * @ip_proto: protocol for which to get port offset | |
6451b3f5 WC |
76 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
77 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
357afe9c NA |
78 | * |
79 | * The function will try to retrieve the ports at offset thoff + poff where poff | |
80 | * is the protocol port offset returned from proto_ports_offset | |
81 | */ | |
690e36e7 DM |
82 | __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, |
83 | void *data, int hlen) | |
357afe9c NA |
84 | { |
85 | int poff = proto_ports_offset(ip_proto); | |
86 | ||
690e36e7 DM |
87 | if (!data) { |
88 | data = skb->data; | |
89 | hlen = skb_headlen(skb); | |
90 | } | |
91 | ||
357afe9c NA |
92 | if (poff >= 0) { |
93 | __be32 *ports, _ports; | |
94 | ||
690e36e7 DM |
95 | ports = __skb_header_pointer(skb, thoff + poff, |
96 | sizeof(_ports), data, hlen, &_ports); | |
357afe9c NA |
97 | if (ports) |
98 | return *ports; | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
690e36e7 | 103 | EXPORT_SYMBOL(__skb_flow_get_ports); |
357afe9c | 104 | |
453a940e WC |
105 | /** |
106 | * __skb_flow_dissect - extract the flow_keys struct and return it | |
107 | * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified | |
06635a35 JP |
108 | * @flow_dissector: list of keys to dissect |
109 | * @target_container: target structure to put dissected values into | |
453a940e WC |
110 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
111 | * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol | |
112 | * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb) | |
113 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
114 | * | |
06635a35 JP |
115 | * The function will try to retrieve individual keys into target specified |
116 | * by flow_dissector from either the skbuff or a raw buffer specified by the | |
117 | * rest parameters. | |
118 | * | |
119 | * Caller must take care of zeroing target container memory. | |
453a940e | 120 | */ |
06635a35 JP |
121 | bool __skb_flow_dissect(const struct sk_buff *skb, |
122 | struct flow_dissector *flow_dissector, | |
123 | void *target_container, | |
453a940e | 124 | void *data, __be16 proto, int nhoff, int hlen) |
0744dd00 | 125 | { |
42aecaa9 | 126 | struct flow_dissector_key_control *key_control; |
06635a35 JP |
127 | struct flow_dissector_key_basic *key_basic; |
128 | struct flow_dissector_key_addrs *key_addrs; | |
129 | struct flow_dissector_key_ports *key_ports; | |
d34af823 | 130 | struct flow_dissector_key_tags *key_tags; |
1fdd512c | 131 | struct flow_dissector_key_keyid *key_keyid; |
0744dd00 | 132 | u8 ip_proto; |
0744dd00 | 133 | |
690e36e7 DM |
134 | if (!data) { |
135 | data = skb->data; | |
453a940e WC |
136 | proto = skb->protocol; |
137 | nhoff = skb_network_offset(skb); | |
690e36e7 DM |
138 | hlen = skb_headlen(skb); |
139 | } | |
140 | ||
42aecaa9 TH |
141 | /* It is ensured by skb_flow_dissector_init() that control key will |
142 | * be always present. | |
143 | */ | |
144 | key_control = skb_flow_dissector_target(flow_dissector, | |
145 | FLOW_DISSECTOR_KEY_CONTROL, | |
146 | target_container); | |
147 | ||
06635a35 JP |
148 | /* It is ensured by skb_flow_dissector_init() that basic key will |
149 | * be always present. | |
150 | */ | |
151 | key_basic = skb_flow_dissector_target(flow_dissector, | |
152 | FLOW_DISSECTOR_KEY_BASIC, | |
153 | target_container); | |
0744dd00 | 154 | |
67a900cc JP |
155 | if (skb_flow_dissector_uses_key(flow_dissector, |
156 | FLOW_DISSECTOR_KEY_ETH_ADDRS)) { | |
157 | struct ethhdr *eth = eth_hdr(skb); | |
158 | struct flow_dissector_key_eth_addrs *key_eth_addrs; | |
159 | ||
160 | key_eth_addrs = skb_flow_dissector_target(flow_dissector, | |
161 | FLOW_DISSECTOR_KEY_ETH_ADDRS, | |
162 | target_container); | |
163 | memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs)); | |
164 | } | |
165 | ||
0744dd00 ED |
166 | again: |
167 | switch (proto) { | |
2b8837ae | 168 | case htons(ETH_P_IP): { |
0744dd00 ED |
169 | const struct iphdr *iph; |
170 | struct iphdr _iph; | |
171 | ip: | |
690e36e7 | 172 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
6f092343 | 173 | if (!iph || iph->ihl < 5) |
0744dd00 | 174 | return false; |
3797d3e8 | 175 | nhoff += iph->ihl * 4; |
0744dd00 | 176 | |
3797d3e8 | 177 | ip_proto = iph->protocol; |
0744dd00 ED |
178 | if (ip_is_fragment(iph)) |
179 | ip_proto = 0; | |
3797d3e8 | 180 | |
06635a35 JP |
181 | if (!skb_flow_dissector_uses_key(flow_dissector, |
182 | FLOW_DISSECTOR_KEY_IPV4_ADDRS)) | |
5af7fb6e | 183 | break; |
c3f83241 | 184 | |
06635a35 | 185 | key_addrs = skb_flow_dissector_target(flow_dissector, |
c3f83241 TH |
186 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, target_container); |
187 | memcpy(&key_addrs->v4addrs, &iph->saddr, | |
188 | sizeof(key_addrs->v4addrs)); | |
189 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
0744dd00 ED |
190 | break; |
191 | } | |
2b8837ae | 192 | case htons(ETH_P_IPV6): { |
0744dd00 ED |
193 | const struct ipv6hdr *iph; |
194 | struct ipv6hdr _iph; | |
19469a87 TH |
195 | __be32 flow_label; |
196 | ||
0744dd00 | 197 | ipv6: |
690e36e7 | 198 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
0744dd00 ED |
199 | if (!iph) |
200 | return false; | |
201 | ||
202 | ip_proto = iph->nexthdr; | |
0744dd00 | 203 | nhoff += sizeof(struct ipv6hdr); |
19469a87 | 204 | |
b924933c JP |
205 | if (skb_flow_dissector_uses_key(flow_dissector, |
206 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
207 | struct flow_dissector_key_ipv6_addrs *key_ipv6_addrs; | |
208 | ||
209 | key_ipv6_addrs = skb_flow_dissector_target(flow_dissector, | |
210 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
211 | target_container); | |
5af7fb6e | 212 | |
b924933c | 213 | memcpy(key_ipv6_addrs, &iph->saddr, sizeof(*key_ipv6_addrs)); |
c3f83241 | 214 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; |
b924933c | 215 | } |
87ee9e52 | 216 | |
19469a87 TH |
217 | flow_label = ip6_flowlabel(iph); |
218 | if (flow_label) { | |
12c227ec | 219 | if (skb_flow_dissector_uses_key(flow_dissector, |
87ee9e52 TH |
220 | FLOW_DISSECTOR_KEY_FLOW_LABEL)) { |
221 | key_tags = skb_flow_dissector_target(flow_dissector, | |
222 | FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
223 | target_container); | |
224 | key_tags->flow_label = ntohl(flow_label); | |
12c227ec | 225 | } |
19469a87 TH |
226 | } |
227 | ||
0744dd00 ED |
228 | break; |
229 | } | |
2b8837ae JP |
230 | case htons(ETH_P_8021AD): |
231 | case htons(ETH_P_8021Q): { | |
0744dd00 ED |
232 | const struct vlan_hdr *vlan; |
233 | struct vlan_hdr _vlan; | |
234 | ||
690e36e7 | 235 | vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), data, hlen, &_vlan); |
0744dd00 ED |
236 | if (!vlan) |
237 | return false; | |
238 | ||
d34af823 TH |
239 | if (skb_flow_dissector_uses_key(flow_dissector, |
240 | FLOW_DISSECTOR_KEY_VLANID)) { | |
241 | key_tags = skb_flow_dissector_target(flow_dissector, | |
242 | FLOW_DISSECTOR_KEY_VLANID, | |
243 | target_container); | |
244 | ||
245 | key_tags->vlan_id = skb_vlan_tag_get_id(skb); | |
246 | } | |
247 | ||
0744dd00 ED |
248 | proto = vlan->h_vlan_encapsulated_proto; |
249 | nhoff += sizeof(*vlan); | |
250 | goto again; | |
251 | } | |
2b8837ae | 252 | case htons(ETH_P_PPP_SES): { |
0744dd00 ED |
253 | struct { |
254 | struct pppoe_hdr hdr; | |
255 | __be16 proto; | |
256 | } *hdr, _hdr; | |
690e36e7 | 257 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
0744dd00 ED |
258 | if (!hdr) |
259 | return false; | |
260 | proto = hdr->proto; | |
261 | nhoff += PPPOE_SES_HLEN; | |
262 | switch (proto) { | |
2b8837ae | 263 | case htons(PPP_IP): |
0744dd00 | 264 | goto ip; |
2b8837ae | 265 | case htons(PPP_IPV6): |
0744dd00 ED |
266 | goto ipv6; |
267 | default: | |
268 | return false; | |
269 | } | |
270 | } | |
08bfc9cb EH |
271 | case htons(ETH_P_TIPC): { |
272 | struct { | |
273 | __be32 pre[3]; | |
274 | __be32 srcnode; | |
275 | } *hdr, _hdr; | |
276 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); | |
277 | if (!hdr) | |
278 | return false; | |
06635a35 | 279 | key_basic->n_proto = proto; |
42aecaa9 | 280 | key_control->thoff = (u16)nhoff; |
06635a35 JP |
281 | |
282 | if (skb_flow_dissector_uses_key(flow_dissector, | |
9f249089 | 283 | FLOW_DISSECTOR_KEY_TIPC_ADDRS)) { |
06635a35 | 284 | key_addrs = skb_flow_dissector_target(flow_dissector, |
9f249089 | 285 | FLOW_DISSECTOR_KEY_TIPC_ADDRS, |
06635a35 | 286 | target_container); |
9f249089 TH |
287 | key_addrs->tipcaddrs.srcnode = hdr->srcnode; |
288 | key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS; | |
06635a35 | 289 | } |
08bfc9cb EH |
290 | return true; |
291 | } | |
b3baa0fb TH |
292 | |
293 | case htons(ETH_P_MPLS_UC): | |
294 | case htons(ETH_P_MPLS_MC): { | |
295 | struct mpls_label *hdr, _hdr[2]; | |
296 | mpls: | |
297 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, | |
298 | hlen, &_hdr); | |
299 | if (!hdr) | |
300 | return false; | |
301 | ||
611d23c5 TH |
302 | if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >> |
303 | MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) { | |
b3baa0fb TH |
304 | if (skb_flow_dissector_uses_key(flow_dissector, |
305 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) { | |
306 | key_keyid = skb_flow_dissector_target(flow_dissector, | |
307 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY, | |
308 | target_container); | |
309 | key_keyid->keyid = hdr[1].entry & | |
310 | htonl(MPLS_LS_LABEL_MASK); | |
311 | } | |
312 | ||
313 | key_basic->n_proto = proto; | |
314 | key_basic->ip_proto = ip_proto; | |
315 | key_control->thoff = (u16)nhoff; | |
316 | ||
317 | return true; | |
318 | } | |
319 | ||
320 | return true; | |
321 | } | |
322 | ||
56193d1b | 323 | case htons(ETH_P_FCOE): |
42aecaa9 | 324 | key_control->thoff = (u16)(nhoff + FCOE_HEADER_LEN); |
56193d1b | 325 | /* fall through */ |
0744dd00 ED |
326 | default: |
327 | return false; | |
328 | } | |
329 | ||
6a74fcf4 | 330 | ip_proto_again: |
0744dd00 ED |
331 | switch (ip_proto) { |
332 | case IPPROTO_GRE: { | |
333 | struct gre_hdr { | |
334 | __be16 flags; | |
335 | __be16 proto; | |
336 | } *hdr, _hdr; | |
337 | ||
690e36e7 | 338 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
0744dd00 ED |
339 | if (!hdr) |
340 | return false; | |
341 | /* | |
342 | * Only look inside GRE if version zero and no | |
343 | * routing | |
344 | */ | |
ce3b5355 TH |
345 | if (hdr->flags & (GRE_VERSION | GRE_ROUTING)) |
346 | break; | |
347 | ||
348 | proto = hdr->proto; | |
349 | nhoff += 4; | |
350 | if (hdr->flags & GRE_CSUM) | |
0744dd00 | 351 | nhoff += 4; |
1fdd512c TH |
352 | if (hdr->flags & GRE_KEY) { |
353 | const __be32 *keyid; | |
354 | __be32 _keyid; | |
355 | ||
356 | keyid = __skb_header_pointer(skb, nhoff, sizeof(_keyid), | |
357 | data, hlen, &_keyid); | |
358 | ||
359 | if (!keyid) | |
360 | return false; | |
361 | ||
362 | if (skb_flow_dissector_uses_key(flow_dissector, | |
363 | FLOW_DISSECTOR_KEY_GRE_KEYID)) { | |
364 | key_keyid = skb_flow_dissector_target(flow_dissector, | |
365 | FLOW_DISSECTOR_KEY_GRE_KEYID, | |
366 | target_container); | |
367 | key_keyid->keyid = *keyid; | |
368 | } | |
ce3b5355 | 369 | nhoff += 4; |
1fdd512c | 370 | } |
ce3b5355 TH |
371 | if (hdr->flags & GRE_SEQ) |
372 | nhoff += 4; | |
373 | if (proto == htons(ETH_P_TEB)) { | |
374 | const struct ethhdr *eth; | |
375 | struct ethhdr _eth; | |
376 | ||
377 | eth = __skb_header_pointer(skb, nhoff, | |
378 | sizeof(_eth), | |
379 | data, hlen, &_eth); | |
380 | if (!eth) | |
381 | return false; | |
382 | proto = eth->h_proto; | |
383 | nhoff += sizeof(*eth); | |
0744dd00 | 384 | } |
ce3b5355 | 385 | goto again; |
0744dd00 | 386 | } |
6a74fcf4 TH |
387 | case NEXTHDR_HOP: |
388 | case NEXTHDR_ROUTING: | |
389 | case NEXTHDR_DEST: { | |
390 | u8 _opthdr[2], *opthdr; | |
391 | ||
392 | if (proto != htons(ETH_P_IPV6)) | |
393 | break; | |
394 | ||
395 | opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr), | |
396 | data, hlen, &_opthdr); | |
397 | ||
398 | ip_proto = _opthdr[0]; | |
399 | nhoff += (_opthdr[1] + 1) << 3; | |
400 | ||
401 | goto ip_proto_again; | |
402 | } | |
0744dd00 | 403 | case IPPROTO_IPIP: |
fca41895 TH |
404 | proto = htons(ETH_P_IP); |
405 | goto ip; | |
b438f940 TH |
406 | case IPPROTO_IPV6: |
407 | proto = htons(ETH_P_IPV6); | |
408 | goto ipv6; | |
b3baa0fb TH |
409 | case IPPROTO_MPLS: |
410 | proto = htons(ETH_P_MPLS_UC); | |
411 | goto mpls; | |
0744dd00 ED |
412 | default: |
413 | break; | |
414 | } | |
415 | ||
06635a35 JP |
416 | key_basic->n_proto = proto; |
417 | key_basic->ip_proto = ip_proto; | |
42aecaa9 | 418 | key_control->thoff = (u16)nhoff; |
06635a35 JP |
419 | |
420 | if (skb_flow_dissector_uses_key(flow_dissector, | |
421 | FLOW_DISSECTOR_KEY_PORTS)) { | |
422 | key_ports = skb_flow_dissector_target(flow_dissector, | |
423 | FLOW_DISSECTOR_KEY_PORTS, | |
424 | target_container); | |
425 | key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto, | |
426 | data, hlen); | |
427 | } | |
5af7fb6e | 428 | |
0744dd00 ED |
429 | return true; |
430 | } | |
690e36e7 | 431 | EXPORT_SYMBOL(__skb_flow_dissect); |
441d9d32 CW |
432 | |
433 | static u32 hashrnd __read_mostly; | |
66415cf8 HFS |
434 | static __always_inline void __flow_hash_secret_init(void) |
435 | { | |
436 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
437 | } | |
438 | ||
42aecaa9 TH |
439 | static __always_inline u32 __flow_hash_words(u32 *words, u32 length, u32 keyval) |
440 | { | |
441 | return jhash2(words, length, keyval); | |
442 | } | |
443 | ||
444 | static inline void *flow_keys_hash_start(struct flow_keys *flow) | |
66415cf8 | 445 | { |
42aecaa9 TH |
446 | BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32)); |
447 | return (void *)flow + FLOW_KEYS_HASH_OFFSET; | |
448 | } | |
449 | ||
450 | static inline size_t flow_keys_hash_length(struct flow_keys *flow) | |
451 | { | |
c3f83241 | 452 | size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs); |
42aecaa9 | 453 | BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32)); |
c3f83241 TH |
454 | BUILD_BUG_ON(offsetof(typeof(*flow), addrs) != |
455 | sizeof(*flow) - sizeof(flow->addrs)); | |
456 | ||
457 | switch (flow->control.addr_type) { | |
458 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
459 | diff -= sizeof(flow->addrs.v4addrs); | |
460 | break; | |
461 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
462 | diff -= sizeof(flow->addrs.v6addrs); | |
463 | break; | |
9f249089 TH |
464 | case FLOW_DISSECTOR_KEY_TIPC_ADDRS: |
465 | diff -= sizeof(flow->addrs.tipcaddrs); | |
466 | break; | |
c3f83241 TH |
467 | } |
468 | return (sizeof(*flow) - diff) / sizeof(u32); | |
469 | } | |
470 | ||
471 | __be32 flow_get_u32_src(const struct flow_keys *flow) | |
472 | { | |
473 | switch (flow->control.addr_type) { | |
474 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
475 | return flow->addrs.v4addrs.src; | |
476 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
477 | return (__force __be32)ipv6_addr_hash( | |
478 | &flow->addrs.v6addrs.src); | |
9f249089 TH |
479 | case FLOW_DISSECTOR_KEY_TIPC_ADDRS: |
480 | return flow->addrs.tipcaddrs.srcnode; | |
c3f83241 TH |
481 | default: |
482 | return 0; | |
483 | } | |
484 | } | |
485 | EXPORT_SYMBOL(flow_get_u32_src); | |
486 | ||
487 | __be32 flow_get_u32_dst(const struct flow_keys *flow) | |
488 | { | |
489 | switch (flow->control.addr_type) { | |
490 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
491 | return flow->addrs.v4addrs.dst; | |
492 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
493 | return (__force __be32)ipv6_addr_hash( | |
494 | &flow->addrs.v6addrs.dst); | |
495 | default: | |
496 | return 0; | |
497 | } | |
498 | } | |
499 | EXPORT_SYMBOL(flow_get_u32_dst); | |
500 | ||
501 | static inline void __flow_hash_consistentify(struct flow_keys *keys) | |
502 | { | |
503 | int addr_diff, i; | |
504 | ||
505 | switch (keys->control.addr_type) { | |
506 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
507 | addr_diff = (__force u32)keys->addrs.v4addrs.dst - | |
508 | (__force u32)keys->addrs.v4addrs.src; | |
509 | if ((addr_diff < 0) || | |
510 | (addr_diff == 0 && | |
511 | ((__force u16)keys->ports.dst < | |
512 | (__force u16)keys->ports.src))) { | |
513 | swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst); | |
514 | swap(keys->ports.src, keys->ports.dst); | |
515 | } | |
516 | break; | |
517 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
518 | addr_diff = memcmp(&keys->addrs.v6addrs.dst, | |
519 | &keys->addrs.v6addrs.src, | |
520 | sizeof(keys->addrs.v6addrs.dst)); | |
521 | if ((addr_diff < 0) || | |
522 | (addr_diff == 0 && | |
523 | ((__force u16)keys->ports.dst < | |
524 | (__force u16)keys->ports.src))) { | |
525 | for (i = 0; i < 4; i++) | |
526 | swap(keys->addrs.v6addrs.src.s6_addr32[i], | |
527 | keys->addrs.v6addrs.dst.s6_addr32[i]); | |
528 | swap(keys->ports.src, keys->ports.dst); | |
529 | } | |
530 | break; | |
531 | } | |
66415cf8 HFS |
532 | } |
533 | ||
50fb7992 | 534 | static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval) |
5ed20a68 TH |
535 | { |
536 | u32 hash; | |
537 | ||
c3f83241 | 538 | __flow_hash_consistentify(keys); |
5ed20a68 | 539 | |
42aecaa9 TH |
540 | hash = __flow_hash_words((u32 *)flow_keys_hash_start(keys), |
541 | flow_keys_hash_length(keys), keyval); | |
5ed20a68 TH |
542 | if (!hash) |
543 | hash = 1; | |
544 | ||
545 | return hash; | |
546 | } | |
547 | ||
548 | u32 flow_hash_from_keys(struct flow_keys *keys) | |
549 | { | |
50fb7992 TH |
550 | __flow_hash_secret_init(); |
551 | return __flow_hash_from_keys(keys, hashrnd); | |
5ed20a68 TH |
552 | } |
553 | EXPORT_SYMBOL(flow_hash_from_keys); | |
554 | ||
50fb7992 TH |
555 | static inline u32 ___skb_get_hash(const struct sk_buff *skb, |
556 | struct flow_keys *keys, u32 keyval) | |
557 | { | |
06635a35 | 558 | if (!skb_flow_dissect_flow_keys(skb, keys)) |
50fb7992 TH |
559 | return 0; |
560 | ||
561 | return __flow_hash_from_keys(keys, keyval); | |
562 | } | |
563 | ||
2f59e1eb TH |
564 | struct _flow_keys_digest_data { |
565 | __be16 n_proto; | |
566 | u8 ip_proto; | |
567 | u8 padding; | |
568 | __be32 ports; | |
569 | __be32 src; | |
570 | __be32 dst; | |
571 | }; | |
572 | ||
573 | void make_flow_keys_digest(struct flow_keys_digest *digest, | |
574 | const struct flow_keys *flow) | |
575 | { | |
576 | struct _flow_keys_digest_data *data = | |
577 | (struct _flow_keys_digest_data *)digest; | |
578 | ||
579 | BUILD_BUG_ON(sizeof(*data) > sizeof(*digest)); | |
580 | ||
581 | memset(digest, 0, sizeof(*digest)); | |
582 | ||
06635a35 JP |
583 | data->n_proto = flow->basic.n_proto; |
584 | data->ip_proto = flow->basic.ip_proto; | |
585 | data->ports = flow->ports.ports; | |
c3f83241 TH |
586 | data->src = flow->addrs.v4addrs.src; |
587 | data->dst = flow->addrs.v4addrs.dst; | |
2f59e1eb TH |
588 | } |
589 | EXPORT_SYMBOL(make_flow_keys_digest); | |
590 | ||
d4fd3275 JP |
591 | /** |
592 | * __skb_get_hash: calculate a flow hash | |
593 | * @skb: sk_buff to calculate flow hash from | |
594 | * | |
595 | * This function calculates a flow hash based on src/dst addresses | |
61b905da TH |
596 | * and src/dst port numbers. Sets hash in skb to non-zero hash value |
597 | * on success, zero indicates no valid hash. Also, sets l4_hash in skb | |
441d9d32 CW |
598 | * if hash is a canonical 4-tuple hash over transport ports. |
599 | */ | |
3958afa1 | 600 | void __skb_get_hash(struct sk_buff *skb) |
441d9d32 CW |
601 | { |
602 | struct flow_keys keys; | |
50fb7992 | 603 | u32 hash; |
441d9d32 | 604 | |
50fb7992 TH |
605 | __flow_hash_secret_init(); |
606 | ||
607 | hash = ___skb_get_hash(skb, &keys, hashrnd); | |
608 | if (!hash) | |
441d9d32 | 609 | return; |
06635a35 | 610 | if (keys.ports.ports) |
61b905da | 611 | skb->l4_hash = 1; |
a3b18ddb | 612 | skb->sw_hash = 1; |
50fb7992 | 613 | skb->hash = hash; |
441d9d32 | 614 | } |
3958afa1 | 615 | EXPORT_SYMBOL(__skb_get_hash); |
441d9d32 | 616 | |
50fb7992 TH |
617 | __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb) |
618 | { | |
619 | struct flow_keys keys; | |
620 | ||
621 | return ___skb_get_hash(skb, &keys, perturb); | |
622 | } | |
623 | EXPORT_SYMBOL(skb_get_hash_perturb); | |
624 | ||
56193d1b AD |
625 | u32 __skb_get_poff(const struct sk_buff *skb, void *data, |
626 | const struct flow_keys *keys, int hlen) | |
f77668dc | 627 | { |
42aecaa9 | 628 | u32 poff = keys->control.thoff; |
f77668dc | 629 | |
06635a35 | 630 | switch (keys->basic.ip_proto) { |
f77668dc | 631 | case IPPROTO_TCP: { |
5af7fb6e AD |
632 | /* access doff as u8 to avoid unaligned access */ |
633 | const u8 *doff; | |
634 | u8 _doff; | |
f77668dc | 635 | |
5af7fb6e AD |
636 | doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff), |
637 | data, hlen, &_doff); | |
638 | if (!doff) | |
f77668dc DB |
639 | return poff; |
640 | ||
5af7fb6e | 641 | poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2); |
f77668dc DB |
642 | break; |
643 | } | |
644 | case IPPROTO_UDP: | |
645 | case IPPROTO_UDPLITE: | |
646 | poff += sizeof(struct udphdr); | |
647 | break; | |
648 | /* For the rest, we do not really care about header | |
649 | * extensions at this point for now. | |
650 | */ | |
651 | case IPPROTO_ICMP: | |
652 | poff += sizeof(struct icmphdr); | |
653 | break; | |
654 | case IPPROTO_ICMPV6: | |
655 | poff += sizeof(struct icmp6hdr); | |
656 | break; | |
657 | case IPPROTO_IGMP: | |
658 | poff += sizeof(struct igmphdr); | |
659 | break; | |
660 | case IPPROTO_DCCP: | |
661 | poff += sizeof(struct dccp_hdr); | |
662 | break; | |
663 | case IPPROTO_SCTP: | |
664 | poff += sizeof(struct sctphdr); | |
665 | break; | |
666 | } | |
667 | ||
668 | return poff; | |
669 | } | |
670 | ||
0db89b8b JP |
671 | /** |
672 | * skb_get_poff - get the offset to the payload | |
673 | * @skb: sk_buff to get the payload offset from | |
674 | * | |
675 | * The function will get the offset to the payload as far as it could | |
676 | * be dissected. The main user is currently BPF, so that we can dynamically | |
56193d1b AD |
677 | * truncate packets without needing to push actual payload to the user |
678 | * space and can analyze headers only, instead. | |
679 | */ | |
680 | u32 skb_get_poff(const struct sk_buff *skb) | |
681 | { | |
682 | struct flow_keys keys; | |
683 | ||
06635a35 | 684 | if (!skb_flow_dissect_flow_keys(skb, &keys)) |
56193d1b AD |
685 | return 0; |
686 | ||
687 | return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb)); | |
688 | } | |
06635a35 JP |
689 | |
690 | static const struct flow_dissector_key flow_keys_dissector_keys[] = { | |
42aecaa9 TH |
691 | { |
692 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
693 | .offset = offsetof(struct flow_keys, control), | |
694 | }, | |
06635a35 JP |
695 | { |
696 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
697 | .offset = offsetof(struct flow_keys, basic), | |
698 | }, | |
699 | { | |
700 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
c3f83241 TH |
701 | .offset = offsetof(struct flow_keys, addrs.v4addrs), |
702 | }, | |
703 | { | |
704 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
705 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
06635a35 | 706 | }, |
9f249089 TH |
707 | { |
708 | .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS, | |
709 | .offset = offsetof(struct flow_keys, addrs.tipcaddrs), | |
710 | }, | |
06635a35 JP |
711 | { |
712 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
713 | .offset = offsetof(struct flow_keys, ports), | |
714 | }, | |
d34af823 TH |
715 | { |
716 | .key_id = FLOW_DISSECTOR_KEY_VLANID, | |
717 | .offset = offsetof(struct flow_keys, tags), | |
718 | }, | |
87ee9e52 TH |
719 | { |
720 | .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
721 | .offset = offsetof(struct flow_keys, tags), | |
722 | }, | |
1fdd512c TH |
723 | { |
724 | .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, | |
725 | .offset = offsetof(struct flow_keys, keyid), | |
726 | }, | |
06635a35 JP |
727 | }; |
728 | ||
729 | static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = { | |
42aecaa9 TH |
730 | { |
731 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
732 | .offset = offsetof(struct flow_keys, control), | |
733 | }, | |
06635a35 JP |
734 | { |
735 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
736 | .offset = offsetof(struct flow_keys, basic), | |
737 | }, | |
738 | }; | |
739 | ||
740 | struct flow_dissector flow_keys_dissector __read_mostly; | |
741 | EXPORT_SYMBOL(flow_keys_dissector); | |
742 | ||
743 | struct flow_dissector flow_keys_buf_dissector __read_mostly; | |
744 | ||
745 | static int __init init_default_flow_dissectors(void) | |
746 | { | |
747 | skb_flow_dissector_init(&flow_keys_dissector, | |
748 | flow_keys_dissector_keys, | |
749 | ARRAY_SIZE(flow_keys_dissector_keys)); | |
750 | skb_flow_dissector_init(&flow_keys_buf_dissector, | |
751 | flow_keys_buf_dissector_keys, | |
752 | ARRAY_SIZE(flow_keys_buf_dissector_keys)); | |
753 | return 0; | |
754 | } | |
755 | ||
756 | late_initcall_sync(init_default_flow_dissectors); |