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 | |
20a17bf6 DM |
22 | static bool dissector_uses_key(const struct flow_dissector *flow_dissector, |
23 | enum flow_dissector_key_id key_id) | |
fbff949e JP |
24 | { |
25 | return flow_dissector->used_keys & (1 << key_id); | |
26 | } | |
27 | ||
20a17bf6 DM |
28 | static void dissector_set_key(struct flow_dissector *flow_dissector, |
29 | enum flow_dissector_key_id key_id) | |
fbff949e JP |
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); | |
20a17bf6 DM |
54 | BUG_ON(dissector_uses_key(flow_dissector, |
55 | key->key_id)); | |
fbff949e | 56 | |
20a17bf6 | 57 | dissector_set_key(flow_dissector, key->key_id); |
fbff949e JP |
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 | */ |
20a17bf6 DM |
64 | BUG_ON(!dissector_uses_key(flow_dissector, |
65 | FLOW_DISSECTOR_KEY_CONTROL)); | |
66 | BUG_ON(!dissector_uses_key(flow_dissector, | |
67 | FLOW_DISSECTOR_KEY_BASIC)); | |
fbff949e JP |
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, | |
cd79a238 TH |
124 | void *data, __be16 proto, int nhoff, int hlen, |
125 | unsigned int flags) | |
0744dd00 | 126 | { |
42aecaa9 | 127 | struct flow_dissector_key_control *key_control; |
06635a35 JP |
128 | struct flow_dissector_key_basic *key_basic; |
129 | struct flow_dissector_key_addrs *key_addrs; | |
130 | struct flow_dissector_key_ports *key_ports; | |
d34af823 | 131 | struct flow_dissector_key_tags *key_tags; |
1fdd512c | 132 | struct flow_dissector_key_keyid *key_keyid; |
8e690ffd | 133 | u8 ip_proto = 0; |
a6e544b0 | 134 | bool ret = false; |
0744dd00 | 135 | |
690e36e7 DM |
136 | if (!data) { |
137 | data = skb->data; | |
453a940e WC |
138 | proto = skb->protocol; |
139 | nhoff = skb_network_offset(skb); | |
690e36e7 DM |
140 | hlen = skb_headlen(skb); |
141 | } | |
142 | ||
42aecaa9 TH |
143 | /* It is ensured by skb_flow_dissector_init() that control key will |
144 | * be always present. | |
145 | */ | |
146 | key_control = skb_flow_dissector_target(flow_dissector, | |
147 | FLOW_DISSECTOR_KEY_CONTROL, | |
148 | target_container); | |
149 | ||
06635a35 JP |
150 | /* It is ensured by skb_flow_dissector_init() that basic key will |
151 | * be always present. | |
152 | */ | |
153 | key_basic = skb_flow_dissector_target(flow_dissector, | |
154 | FLOW_DISSECTOR_KEY_BASIC, | |
155 | target_container); | |
0744dd00 | 156 | |
20a17bf6 DM |
157 | if (dissector_uses_key(flow_dissector, |
158 | FLOW_DISSECTOR_KEY_ETH_ADDRS)) { | |
67a900cc JP |
159 | struct ethhdr *eth = eth_hdr(skb); |
160 | struct flow_dissector_key_eth_addrs *key_eth_addrs; | |
161 | ||
162 | key_eth_addrs = skb_flow_dissector_target(flow_dissector, | |
163 | FLOW_DISSECTOR_KEY_ETH_ADDRS, | |
164 | target_container); | |
165 | memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs)); | |
166 | } | |
167 | ||
0744dd00 ED |
168 | again: |
169 | switch (proto) { | |
2b8837ae | 170 | case htons(ETH_P_IP): { |
0744dd00 ED |
171 | const struct iphdr *iph; |
172 | struct iphdr _iph; | |
173 | ip: | |
690e36e7 | 174 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
6f092343 | 175 | if (!iph || iph->ihl < 5) |
a6e544b0 | 176 | goto out_bad; |
3797d3e8 | 177 | nhoff += iph->ihl * 4; |
0744dd00 | 178 | |
3797d3e8 | 179 | ip_proto = iph->protocol; |
3797d3e8 | 180 | |
20a17bf6 DM |
181 | if (!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; | |
807e165d TH |
190 | |
191 | if (ip_is_fragment(iph)) { | |
4b36993d | 192 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
807e165d TH |
193 | |
194 | if (iph->frag_off & htons(IP_OFFSET)) { | |
195 | goto out_good; | |
196 | } else { | |
4b36993d | 197 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
807e165d TH |
198 | if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) |
199 | goto out_good; | |
200 | } | |
201 | } | |
202 | ||
8306b688 TH |
203 | if (flags & FLOW_DISSECTOR_F_STOP_AT_L3) |
204 | goto out_good; | |
205 | ||
0744dd00 ED |
206 | break; |
207 | } | |
2b8837ae | 208 | case htons(ETH_P_IPV6): { |
0744dd00 ED |
209 | const struct ipv6hdr *iph; |
210 | struct ipv6hdr _iph; | |
19469a87 | 211 | |
0744dd00 | 212 | ipv6: |
690e36e7 | 213 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
0744dd00 | 214 | if (!iph) |
a6e544b0 | 215 | goto out_bad; |
0744dd00 ED |
216 | |
217 | ip_proto = iph->nexthdr; | |
0744dd00 | 218 | nhoff += sizeof(struct ipv6hdr); |
19469a87 | 219 | |
20a17bf6 DM |
220 | if (dissector_uses_key(flow_dissector, |
221 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
b924933c JP |
222 | struct flow_dissector_key_ipv6_addrs *key_ipv6_addrs; |
223 | ||
224 | key_ipv6_addrs = skb_flow_dissector_target(flow_dissector, | |
225 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
226 | target_container); | |
5af7fb6e | 227 | |
b924933c | 228 | memcpy(key_ipv6_addrs, &iph->saddr, sizeof(*key_ipv6_addrs)); |
c3f83241 | 229 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; |
b924933c | 230 | } |
87ee9e52 | 231 | |
461547f3 AD |
232 | if ((dissector_uses_key(flow_dissector, |
233 | FLOW_DISSECTOR_KEY_FLOW_LABEL) || | |
234 | (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) && | |
235 | ip6_flowlabel(iph)) { | |
236 | __be32 flow_label = ip6_flowlabel(iph); | |
237 | ||
20a17bf6 DM |
238 | if (dissector_uses_key(flow_dissector, |
239 | FLOW_DISSECTOR_KEY_FLOW_LABEL)) { | |
87ee9e52 TH |
240 | key_tags = skb_flow_dissector_target(flow_dissector, |
241 | FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
242 | target_container); | |
243 | key_tags->flow_label = ntohl(flow_label); | |
12c227ec | 244 | } |
872b1abb TH |
245 | if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) |
246 | goto out_good; | |
19469a87 TH |
247 | } |
248 | ||
8306b688 TH |
249 | if (flags & FLOW_DISSECTOR_F_STOP_AT_L3) |
250 | goto out_good; | |
251 | ||
0744dd00 ED |
252 | break; |
253 | } | |
2b8837ae JP |
254 | case htons(ETH_P_8021AD): |
255 | case htons(ETH_P_8021Q): { | |
0744dd00 ED |
256 | const struct vlan_hdr *vlan; |
257 | struct vlan_hdr _vlan; | |
258 | ||
690e36e7 | 259 | vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), data, hlen, &_vlan); |
0744dd00 | 260 | if (!vlan) |
a6e544b0 | 261 | goto out_bad; |
0744dd00 | 262 | |
20a17bf6 DM |
263 | if (dissector_uses_key(flow_dissector, |
264 | FLOW_DISSECTOR_KEY_VLANID)) { | |
d34af823 TH |
265 | key_tags = skb_flow_dissector_target(flow_dissector, |
266 | FLOW_DISSECTOR_KEY_VLANID, | |
267 | target_container); | |
268 | ||
269 | key_tags->vlan_id = skb_vlan_tag_get_id(skb); | |
270 | } | |
271 | ||
0744dd00 ED |
272 | proto = vlan->h_vlan_encapsulated_proto; |
273 | nhoff += sizeof(*vlan); | |
274 | goto again; | |
275 | } | |
2b8837ae | 276 | case htons(ETH_P_PPP_SES): { |
0744dd00 ED |
277 | struct { |
278 | struct pppoe_hdr hdr; | |
279 | __be16 proto; | |
280 | } *hdr, _hdr; | |
690e36e7 | 281 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
0744dd00 | 282 | if (!hdr) |
a6e544b0 | 283 | goto out_bad; |
0744dd00 ED |
284 | proto = hdr->proto; |
285 | nhoff += PPPOE_SES_HLEN; | |
286 | switch (proto) { | |
2b8837ae | 287 | case htons(PPP_IP): |
0744dd00 | 288 | goto ip; |
2b8837ae | 289 | case htons(PPP_IPV6): |
0744dd00 ED |
290 | goto ipv6; |
291 | default: | |
a6e544b0 | 292 | goto out_bad; |
0744dd00 ED |
293 | } |
294 | } | |
08bfc9cb EH |
295 | case htons(ETH_P_TIPC): { |
296 | struct { | |
297 | __be32 pre[3]; | |
298 | __be32 srcnode; | |
299 | } *hdr, _hdr; | |
300 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); | |
301 | if (!hdr) | |
a6e544b0 | 302 | goto out_bad; |
06635a35 | 303 | |
20a17bf6 DM |
304 | if (dissector_uses_key(flow_dissector, |
305 | FLOW_DISSECTOR_KEY_TIPC_ADDRS)) { | |
06635a35 | 306 | key_addrs = skb_flow_dissector_target(flow_dissector, |
9f249089 | 307 | FLOW_DISSECTOR_KEY_TIPC_ADDRS, |
06635a35 | 308 | target_container); |
9f249089 TH |
309 | key_addrs->tipcaddrs.srcnode = hdr->srcnode; |
310 | key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS; | |
06635a35 | 311 | } |
a6e544b0 | 312 | goto out_good; |
08bfc9cb | 313 | } |
b3baa0fb TH |
314 | |
315 | case htons(ETH_P_MPLS_UC): | |
316 | case htons(ETH_P_MPLS_MC): { | |
317 | struct mpls_label *hdr, _hdr[2]; | |
318 | mpls: | |
319 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, | |
320 | hlen, &_hdr); | |
321 | if (!hdr) | |
a6e544b0 | 322 | goto out_bad; |
b3baa0fb | 323 | |
611d23c5 TH |
324 | if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >> |
325 | MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) { | |
20a17bf6 DM |
326 | if (dissector_uses_key(flow_dissector, |
327 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) { | |
b3baa0fb TH |
328 | key_keyid = skb_flow_dissector_target(flow_dissector, |
329 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY, | |
330 | target_container); | |
331 | key_keyid->keyid = hdr[1].entry & | |
332 | htonl(MPLS_LS_LABEL_MASK); | |
333 | } | |
334 | ||
a6e544b0 | 335 | goto out_good; |
b3baa0fb TH |
336 | } |
337 | ||
a6e544b0 | 338 | goto out_good; |
b3baa0fb TH |
339 | } |
340 | ||
56193d1b | 341 | case htons(ETH_P_FCOE): |
42aecaa9 | 342 | key_control->thoff = (u16)(nhoff + FCOE_HEADER_LEN); |
56193d1b | 343 | /* fall through */ |
0744dd00 | 344 | default: |
a6e544b0 | 345 | goto out_bad; |
0744dd00 ED |
346 | } |
347 | ||
6a74fcf4 | 348 | ip_proto_again: |
0744dd00 ED |
349 | switch (ip_proto) { |
350 | case IPPROTO_GRE: { | |
351 | struct gre_hdr { | |
352 | __be16 flags; | |
353 | __be16 proto; | |
354 | } *hdr, _hdr; | |
355 | ||
690e36e7 | 356 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
0744dd00 | 357 | if (!hdr) |
a6e544b0 | 358 | goto out_bad; |
0744dd00 ED |
359 | /* |
360 | * Only look inside GRE if version zero and no | |
361 | * routing | |
362 | */ | |
ce3b5355 TH |
363 | if (hdr->flags & (GRE_VERSION | GRE_ROUTING)) |
364 | break; | |
365 | ||
366 | proto = hdr->proto; | |
367 | nhoff += 4; | |
368 | if (hdr->flags & GRE_CSUM) | |
0744dd00 | 369 | nhoff += 4; |
1fdd512c TH |
370 | if (hdr->flags & GRE_KEY) { |
371 | const __be32 *keyid; | |
372 | __be32 _keyid; | |
373 | ||
374 | keyid = __skb_header_pointer(skb, nhoff, sizeof(_keyid), | |
375 | data, hlen, &_keyid); | |
376 | ||
377 | if (!keyid) | |
a6e544b0 | 378 | goto out_bad; |
1fdd512c | 379 | |
20a17bf6 DM |
380 | if (dissector_uses_key(flow_dissector, |
381 | FLOW_DISSECTOR_KEY_GRE_KEYID)) { | |
1fdd512c TH |
382 | key_keyid = skb_flow_dissector_target(flow_dissector, |
383 | FLOW_DISSECTOR_KEY_GRE_KEYID, | |
384 | target_container); | |
385 | key_keyid->keyid = *keyid; | |
386 | } | |
ce3b5355 | 387 | nhoff += 4; |
1fdd512c | 388 | } |
ce3b5355 TH |
389 | if (hdr->flags & GRE_SEQ) |
390 | nhoff += 4; | |
391 | if (proto == htons(ETH_P_TEB)) { | |
392 | const struct ethhdr *eth; | |
393 | struct ethhdr _eth; | |
394 | ||
395 | eth = __skb_header_pointer(skb, nhoff, | |
396 | sizeof(_eth), | |
397 | data, hlen, &_eth); | |
398 | if (!eth) | |
a6e544b0 | 399 | goto out_bad; |
ce3b5355 TH |
400 | proto = eth->h_proto; |
401 | nhoff += sizeof(*eth); | |
78565208 AD |
402 | |
403 | /* Cap headers that we access via pointers at the | |
404 | * end of the Ethernet header as our maximum alignment | |
405 | * at that point is only 2 bytes. | |
406 | */ | |
407 | if (NET_IP_ALIGN) | |
408 | hlen = nhoff; | |
0744dd00 | 409 | } |
823b9693 | 410 | |
4b36993d | 411 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
412 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
413 | goto out_good; | |
414 | ||
ce3b5355 | 415 | goto again; |
0744dd00 | 416 | } |
6a74fcf4 TH |
417 | case NEXTHDR_HOP: |
418 | case NEXTHDR_ROUTING: | |
419 | case NEXTHDR_DEST: { | |
420 | u8 _opthdr[2], *opthdr; | |
421 | ||
422 | if (proto != htons(ETH_P_IPV6)) | |
423 | break; | |
424 | ||
425 | opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr), | |
426 | data, hlen, &_opthdr); | |
1e98a0f0 | 427 | if (!opthdr) |
a6e544b0 | 428 | goto out_bad; |
6a74fcf4 | 429 | |
1e98a0f0 ED |
430 | ip_proto = opthdr[0]; |
431 | nhoff += (opthdr[1] + 1) << 3; | |
6a74fcf4 TH |
432 | |
433 | goto ip_proto_again; | |
434 | } | |
b840f28b TH |
435 | case NEXTHDR_FRAGMENT: { |
436 | struct frag_hdr _fh, *fh; | |
437 | ||
438 | if (proto != htons(ETH_P_IPV6)) | |
439 | break; | |
440 | ||
441 | fh = __skb_header_pointer(skb, nhoff, sizeof(_fh), | |
442 | data, hlen, &_fh); | |
443 | ||
444 | if (!fh) | |
445 | goto out_bad; | |
446 | ||
4b36993d | 447 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
b840f28b TH |
448 | |
449 | nhoff += sizeof(_fh); | |
450 | ||
451 | if (!(fh->frag_off & htons(IP6_OFFSET))) { | |
4b36993d | 452 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
b840f28b TH |
453 | if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) { |
454 | ip_proto = fh->nexthdr; | |
455 | goto ip_proto_again; | |
456 | } | |
457 | } | |
458 | goto out_good; | |
459 | } | |
0744dd00 | 460 | case IPPROTO_IPIP: |
fca41895 | 461 | proto = htons(ETH_P_IP); |
823b9693 | 462 | |
4b36993d | 463 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
464 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
465 | goto out_good; | |
466 | ||
fca41895 | 467 | goto ip; |
b438f940 TH |
468 | case IPPROTO_IPV6: |
469 | proto = htons(ETH_P_IPV6); | |
823b9693 | 470 | |
4b36993d | 471 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
472 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
473 | goto out_good; | |
474 | ||
b438f940 | 475 | goto ipv6; |
b3baa0fb TH |
476 | case IPPROTO_MPLS: |
477 | proto = htons(ETH_P_MPLS_UC); | |
478 | goto mpls; | |
0744dd00 ED |
479 | default: |
480 | break; | |
481 | } | |
482 | ||
20a17bf6 DM |
483 | if (dissector_uses_key(flow_dissector, |
484 | FLOW_DISSECTOR_KEY_PORTS)) { | |
06635a35 JP |
485 | key_ports = skb_flow_dissector_target(flow_dissector, |
486 | FLOW_DISSECTOR_KEY_PORTS, | |
487 | target_container); | |
488 | key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto, | |
489 | data, hlen); | |
490 | } | |
5af7fb6e | 491 | |
a6e544b0 TH |
492 | out_good: |
493 | ret = true; | |
494 | ||
495 | out_bad: | |
496 | key_basic->n_proto = proto; | |
497 | key_basic->ip_proto = ip_proto; | |
498 | key_control->thoff = (u16)nhoff; | |
499 | ||
500 | return ret; | |
0744dd00 | 501 | } |
690e36e7 | 502 | EXPORT_SYMBOL(__skb_flow_dissect); |
441d9d32 CW |
503 | |
504 | static u32 hashrnd __read_mostly; | |
66415cf8 HFS |
505 | static __always_inline void __flow_hash_secret_init(void) |
506 | { | |
507 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
508 | } | |
509 | ||
20a17bf6 DM |
510 | static __always_inline u32 __flow_hash_words(const u32 *words, u32 length, |
511 | u32 keyval) | |
42aecaa9 TH |
512 | { |
513 | return jhash2(words, length, keyval); | |
514 | } | |
515 | ||
20a17bf6 | 516 | static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow) |
66415cf8 | 517 | { |
20a17bf6 DM |
518 | const void *p = flow; |
519 | ||
42aecaa9 | 520 | BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32)); |
20a17bf6 | 521 | return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET); |
42aecaa9 TH |
522 | } |
523 | ||
20a17bf6 | 524 | static inline size_t flow_keys_hash_length(const struct flow_keys *flow) |
42aecaa9 | 525 | { |
c3f83241 | 526 | size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs); |
42aecaa9 | 527 | BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32)); |
c3f83241 TH |
528 | BUILD_BUG_ON(offsetof(typeof(*flow), addrs) != |
529 | sizeof(*flow) - sizeof(flow->addrs)); | |
530 | ||
531 | switch (flow->control.addr_type) { | |
532 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
533 | diff -= sizeof(flow->addrs.v4addrs); | |
534 | break; | |
535 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
536 | diff -= sizeof(flow->addrs.v6addrs); | |
537 | break; | |
9f249089 TH |
538 | case FLOW_DISSECTOR_KEY_TIPC_ADDRS: |
539 | diff -= sizeof(flow->addrs.tipcaddrs); | |
540 | break; | |
c3f83241 TH |
541 | } |
542 | return (sizeof(*flow) - diff) / sizeof(u32); | |
543 | } | |
544 | ||
545 | __be32 flow_get_u32_src(const struct flow_keys *flow) | |
546 | { | |
547 | switch (flow->control.addr_type) { | |
548 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
549 | return flow->addrs.v4addrs.src; | |
550 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
551 | return (__force __be32)ipv6_addr_hash( | |
552 | &flow->addrs.v6addrs.src); | |
9f249089 TH |
553 | case FLOW_DISSECTOR_KEY_TIPC_ADDRS: |
554 | return flow->addrs.tipcaddrs.srcnode; | |
c3f83241 TH |
555 | default: |
556 | return 0; | |
557 | } | |
558 | } | |
559 | EXPORT_SYMBOL(flow_get_u32_src); | |
560 | ||
561 | __be32 flow_get_u32_dst(const struct flow_keys *flow) | |
562 | { | |
563 | switch (flow->control.addr_type) { | |
564 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
565 | return flow->addrs.v4addrs.dst; | |
566 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
567 | return (__force __be32)ipv6_addr_hash( | |
568 | &flow->addrs.v6addrs.dst); | |
569 | default: | |
570 | return 0; | |
571 | } | |
572 | } | |
573 | EXPORT_SYMBOL(flow_get_u32_dst); | |
574 | ||
575 | static inline void __flow_hash_consistentify(struct flow_keys *keys) | |
576 | { | |
577 | int addr_diff, i; | |
578 | ||
579 | switch (keys->control.addr_type) { | |
580 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
581 | addr_diff = (__force u32)keys->addrs.v4addrs.dst - | |
582 | (__force u32)keys->addrs.v4addrs.src; | |
583 | if ((addr_diff < 0) || | |
584 | (addr_diff == 0 && | |
585 | ((__force u16)keys->ports.dst < | |
586 | (__force u16)keys->ports.src))) { | |
587 | swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst); | |
588 | swap(keys->ports.src, keys->ports.dst); | |
589 | } | |
590 | break; | |
591 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
592 | addr_diff = memcmp(&keys->addrs.v6addrs.dst, | |
593 | &keys->addrs.v6addrs.src, | |
594 | sizeof(keys->addrs.v6addrs.dst)); | |
595 | if ((addr_diff < 0) || | |
596 | (addr_diff == 0 && | |
597 | ((__force u16)keys->ports.dst < | |
598 | (__force u16)keys->ports.src))) { | |
599 | for (i = 0; i < 4; i++) | |
600 | swap(keys->addrs.v6addrs.src.s6_addr32[i], | |
601 | keys->addrs.v6addrs.dst.s6_addr32[i]); | |
602 | swap(keys->ports.src, keys->ports.dst); | |
603 | } | |
604 | break; | |
605 | } | |
66415cf8 HFS |
606 | } |
607 | ||
50fb7992 | 608 | static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval) |
5ed20a68 TH |
609 | { |
610 | u32 hash; | |
611 | ||
c3f83241 | 612 | __flow_hash_consistentify(keys); |
5ed20a68 | 613 | |
20a17bf6 | 614 | hash = __flow_hash_words(flow_keys_hash_start(keys), |
42aecaa9 | 615 | flow_keys_hash_length(keys), keyval); |
5ed20a68 TH |
616 | if (!hash) |
617 | hash = 1; | |
618 | ||
619 | return hash; | |
620 | } | |
621 | ||
622 | u32 flow_hash_from_keys(struct flow_keys *keys) | |
623 | { | |
50fb7992 TH |
624 | __flow_hash_secret_init(); |
625 | return __flow_hash_from_keys(keys, hashrnd); | |
5ed20a68 TH |
626 | } |
627 | EXPORT_SYMBOL(flow_hash_from_keys); | |
628 | ||
50fb7992 TH |
629 | static inline u32 ___skb_get_hash(const struct sk_buff *skb, |
630 | struct flow_keys *keys, u32 keyval) | |
631 | { | |
6db61d79 TH |
632 | skb_flow_dissect_flow_keys(skb, keys, |
633 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
50fb7992 TH |
634 | |
635 | return __flow_hash_from_keys(keys, keyval); | |
636 | } | |
637 | ||
2f59e1eb TH |
638 | struct _flow_keys_digest_data { |
639 | __be16 n_proto; | |
640 | u8 ip_proto; | |
641 | u8 padding; | |
642 | __be32 ports; | |
643 | __be32 src; | |
644 | __be32 dst; | |
645 | }; | |
646 | ||
647 | void make_flow_keys_digest(struct flow_keys_digest *digest, | |
648 | const struct flow_keys *flow) | |
649 | { | |
650 | struct _flow_keys_digest_data *data = | |
651 | (struct _flow_keys_digest_data *)digest; | |
652 | ||
653 | BUILD_BUG_ON(sizeof(*data) > sizeof(*digest)); | |
654 | ||
655 | memset(digest, 0, sizeof(*digest)); | |
656 | ||
06635a35 JP |
657 | data->n_proto = flow->basic.n_proto; |
658 | data->ip_proto = flow->basic.ip_proto; | |
659 | data->ports = flow->ports.ports; | |
c3f83241 TH |
660 | data->src = flow->addrs.v4addrs.src; |
661 | data->dst = flow->addrs.v4addrs.dst; | |
2f59e1eb TH |
662 | } |
663 | EXPORT_SYMBOL(make_flow_keys_digest); | |
664 | ||
d4fd3275 JP |
665 | /** |
666 | * __skb_get_hash: calculate a flow hash | |
667 | * @skb: sk_buff to calculate flow hash from | |
668 | * | |
669 | * This function calculates a flow hash based on src/dst addresses | |
61b905da TH |
670 | * and src/dst port numbers. Sets hash in skb to non-zero hash value |
671 | * on success, zero indicates no valid hash. Also, sets l4_hash in skb | |
441d9d32 CW |
672 | * if hash is a canonical 4-tuple hash over transport ports. |
673 | */ | |
3958afa1 | 674 | void __skb_get_hash(struct sk_buff *skb) |
441d9d32 CW |
675 | { |
676 | struct flow_keys keys; | |
441d9d32 | 677 | |
50fb7992 TH |
678 | __flow_hash_secret_init(); |
679 | ||
6db61d79 | 680 | __skb_set_sw_hash(skb, ___skb_get_hash(skb, &keys, hashrnd), |
bcc83839 | 681 | flow_keys_have_l4(&keys)); |
441d9d32 | 682 | } |
3958afa1 | 683 | EXPORT_SYMBOL(__skb_get_hash); |
441d9d32 | 684 | |
50fb7992 TH |
685 | __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb) |
686 | { | |
687 | struct flow_keys keys; | |
688 | ||
689 | return ___skb_get_hash(skb, &keys, perturb); | |
690 | } | |
691 | EXPORT_SYMBOL(skb_get_hash_perturb); | |
692 | ||
20a17bf6 | 693 | __u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6) |
f70ea018 TH |
694 | { |
695 | struct flow_keys keys; | |
696 | ||
697 | memset(&keys, 0, sizeof(keys)); | |
698 | ||
699 | memcpy(&keys.addrs.v6addrs.src, &fl6->saddr, | |
700 | sizeof(keys.addrs.v6addrs.src)); | |
701 | memcpy(&keys.addrs.v6addrs.dst, &fl6->daddr, | |
702 | sizeof(keys.addrs.v6addrs.dst)); | |
703 | keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
704 | keys.ports.src = fl6->fl6_sport; | |
705 | keys.ports.dst = fl6->fl6_dport; | |
706 | keys.keyid.keyid = fl6->fl6_gre_key; | |
707 | keys.tags.flow_label = (__force u32)fl6->flowlabel; | |
708 | keys.basic.ip_proto = fl6->flowi6_proto; | |
709 | ||
bcc83839 TH |
710 | __skb_set_sw_hash(skb, flow_hash_from_keys(&keys), |
711 | flow_keys_have_l4(&keys)); | |
f70ea018 TH |
712 | |
713 | return skb->hash; | |
714 | } | |
715 | EXPORT_SYMBOL(__skb_get_hash_flowi6); | |
716 | ||
20a17bf6 | 717 | __u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4) |
f70ea018 TH |
718 | { |
719 | struct flow_keys keys; | |
720 | ||
721 | memset(&keys, 0, sizeof(keys)); | |
722 | ||
723 | keys.addrs.v4addrs.src = fl4->saddr; | |
724 | keys.addrs.v4addrs.dst = fl4->daddr; | |
725 | keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
726 | keys.ports.src = fl4->fl4_sport; | |
727 | keys.ports.dst = fl4->fl4_dport; | |
728 | keys.keyid.keyid = fl4->fl4_gre_key; | |
729 | keys.basic.ip_proto = fl4->flowi4_proto; | |
730 | ||
bcc83839 TH |
731 | __skb_set_sw_hash(skb, flow_hash_from_keys(&keys), |
732 | flow_keys_have_l4(&keys)); | |
f70ea018 TH |
733 | |
734 | return skb->hash; | |
735 | } | |
736 | EXPORT_SYMBOL(__skb_get_hash_flowi4); | |
737 | ||
56193d1b AD |
738 | u32 __skb_get_poff(const struct sk_buff *skb, void *data, |
739 | const struct flow_keys *keys, int hlen) | |
f77668dc | 740 | { |
42aecaa9 | 741 | u32 poff = keys->control.thoff; |
f77668dc | 742 | |
06635a35 | 743 | switch (keys->basic.ip_proto) { |
f77668dc | 744 | case IPPROTO_TCP: { |
5af7fb6e AD |
745 | /* access doff as u8 to avoid unaligned access */ |
746 | const u8 *doff; | |
747 | u8 _doff; | |
f77668dc | 748 | |
5af7fb6e AD |
749 | doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff), |
750 | data, hlen, &_doff); | |
751 | if (!doff) | |
f77668dc DB |
752 | return poff; |
753 | ||
5af7fb6e | 754 | poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2); |
f77668dc DB |
755 | break; |
756 | } | |
757 | case IPPROTO_UDP: | |
758 | case IPPROTO_UDPLITE: | |
759 | poff += sizeof(struct udphdr); | |
760 | break; | |
761 | /* For the rest, we do not really care about header | |
762 | * extensions at this point for now. | |
763 | */ | |
764 | case IPPROTO_ICMP: | |
765 | poff += sizeof(struct icmphdr); | |
766 | break; | |
767 | case IPPROTO_ICMPV6: | |
768 | poff += sizeof(struct icmp6hdr); | |
769 | break; | |
770 | case IPPROTO_IGMP: | |
771 | poff += sizeof(struct igmphdr); | |
772 | break; | |
773 | case IPPROTO_DCCP: | |
774 | poff += sizeof(struct dccp_hdr); | |
775 | break; | |
776 | case IPPROTO_SCTP: | |
777 | poff += sizeof(struct sctphdr); | |
778 | break; | |
779 | } | |
780 | ||
781 | return poff; | |
782 | } | |
783 | ||
0db89b8b JP |
784 | /** |
785 | * skb_get_poff - get the offset to the payload | |
786 | * @skb: sk_buff to get the payload offset from | |
787 | * | |
788 | * The function will get the offset to the payload as far as it could | |
789 | * be dissected. The main user is currently BPF, so that we can dynamically | |
56193d1b AD |
790 | * truncate packets without needing to push actual payload to the user |
791 | * space and can analyze headers only, instead. | |
792 | */ | |
793 | u32 skb_get_poff(const struct sk_buff *skb) | |
794 | { | |
795 | struct flow_keys keys; | |
796 | ||
cd79a238 | 797 | if (!skb_flow_dissect_flow_keys(skb, &keys, 0)) |
56193d1b AD |
798 | return 0; |
799 | ||
800 | return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb)); | |
801 | } | |
06635a35 | 802 | |
20a17bf6 | 803 | __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys) |
a17ace95 DM |
804 | { |
805 | memset(keys, 0, sizeof(*keys)); | |
806 | ||
807 | memcpy(&keys->addrs.v6addrs.src, &fl6->saddr, | |
808 | sizeof(keys->addrs.v6addrs.src)); | |
809 | memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr, | |
810 | sizeof(keys->addrs.v6addrs.dst)); | |
811 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
812 | keys->ports.src = fl6->fl6_sport; | |
813 | keys->ports.dst = fl6->fl6_dport; | |
814 | keys->keyid.keyid = fl6->fl6_gre_key; | |
815 | keys->tags.flow_label = (__force u32)fl6->flowlabel; | |
816 | keys->basic.ip_proto = fl6->flowi6_proto; | |
817 | ||
818 | return flow_hash_from_keys(keys); | |
819 | } | |
820 | EXPORT_SYMBOL(__get_hash_from_flowi6); | |
821 | ||
20a17bf6 | 822 | __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys) |
a17ace95 DM |
823 | { |
824 | memset(keys, 0, sizeof(*keys)); | |
825 | ||
826 | keys->addrs.v4addrs.src = fl4->saddr; | |
827 | keys->addrs.v4addrs.dst = fl4->daddr; | |
828 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
829 | keys->ports.src = fl4->fl4_sport; | |
830 | keys->ports.dst = fl4->fl4_dport; | |
831 | keys->keyid.keyid = fl4->fl4_gre_key; | |
832 | keys->basic.ip_proto = fl4->flowi4_proto; | |
833 | ||
834 | return flow_hash_from_keys(keys); | |
835 | } | |
836 | EXPORT_SYMBOL(__get_hash_from_flowi4); | |
837 | ||
06635a35 | 838 | static const struct flow_dissector_key flow_keys_dissector_keys[] = { |
42aecaa9 TH |
839 | { |
840 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
841 | .offset = offsetof(struct flow_keys, control), | |
842 | }, | |
06635a35 JP |
843 | { |
844 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
845 | .offset = offsetof(struct flow_keys, basic), | |
846 | }, | |
847 | { | |
848 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
c3f83241 TH |
849 | .offset = offsetof(struct flow_keys, addrs.v4addrs), |
850 | }, | |
851 | { | |
852 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
853 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
06635a35 | 854 | }, |
9f249089 TH |
855 | { |
856 | .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS, | |
857 | .offset = offsetof(struct flow_keys, addrs.tipcaddrs), | |
858 | }, | |
06635a35 JP |
859 | { |
860 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
861 | .offset = offsetof(struct flow_keys, ports), | |
862 | }, | |
d34af823 TH |
863 | { |
864 | .key_id = FLOW_DISSECTOR_KEY_VLANID, | |
865 | .offset = offsetof(struct flow_keys, tags), | |
866 | }, | |
87ee9e52 TH |
867 | { |
868 | .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
869 | .offset = offsetof(struct flow_keys, tags), | |
870 | }, | |
1fdd512c TH |
871 | { |
872 | .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, | |
873 | .offset = offsetof(struct flow_keys, keyid), | |
874 | }, | |
06635a35 JP |
875 | }; |
876 | ||
877 | static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = { | |
42aecaa9 TH |
878 | { |
879 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
880 | .offset = offsetof(struct flow_keys, control), | |
881 | }, | |
06635a35 JP |
882 | { |
883 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
884 | .offset = offsetof(struct flow_keys, basic), | |
885 | }, | |
886 | }; | |
887 | ||
888 | struct flow_dissector flow_keys_dissector __read_mostly; | |
889 | EXPORT_SYMBOL(flow_keys_dissector); | |
890 | ||
891 | struct flow_dissector flow_keys_buf_dissector __read_mostly; | |
892 | ||
893 | static int __init init_default_flow_dissectors(void) | |
894 | { | |
895 | skb_flow_dissector_init(&flow_keys_dissector, | |
896 | flow_keys_dissector_keys, | |
897 | ARRAY_SIZE(flow_keys_dissector_keys)); | |
898 | skb_flow_dissector_init(&flow_keys_buf_dissector, | |
899 | flow_keys_buf_dissector_keys, | |
900 | ARRAY_SIZE(flow_keys_buf_dissector_keys)); | |
901 | return 0; | |
902 | } | |
903 | ||
904 | late_initcall_sync(init_default_flow_dissectors); |