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); | |
0744dd00 | 402 | } |
823b9693 | 403 | |
4b36993d | 404 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
405 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
406 | goto out_good; | |
407 | ||
ce3b5355 | 408 | goto again; |
0744dd00 | 409 | } |
6a74fcf4 TH |
410 | case NEXTHDR_HOP: |
411 | case NEXTHDR_ROUTING: | |
412 | case NEXTHDR_DEST: { | |
413 | u8 _opthdr[2], *opthdr; | |
414 | ||
415 | if (proto != htons(ETH_P_IPV6)) | |
416 | break; | |
417 | ||
418 | opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr), | |
419 | data, hlen, &_opthdr); | |
1e98a0f0 | 420 | if (!opthdr) |
a6e544b0 | 421 | goto out_bad; |
6a74fcf4 | 422 | |
1e98a0f0 ED |
423 | ip_proto = opthdr[0]; |
424 | nhoff += (opthdr[1] + 1) << 3; | |
6a74fcf4 TH |
425 | |
426 | goto ip_proto_again; | |
427 | } | |
b840f28b TH |
428 | case NEXTHDR_FRAGMENT: { |
429 | struct frag_hdr _fh, *fh; | |
430 | ||
431 | if (proto != htons(ETH_P_IPV6)) | |
432 | break; | |
433 | ||
434 | fh = __skb_header_pointer(skb, nhoff, sizeof(_fh), | |
435 | data, hlen, &_fh); | |
436 | ||
437 | if (!fh) | |
438 | goto out_bad; | |
439 | ||
4b36993d | 440 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
b840f28b TH |
441 | |
442 | nhoff += sizeof(_fh); | |
443 | ||
444 | if (!(fh->frag_off & htons(IP6_OFFSET))) { | |
4b36993d | 445 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
b840f28b TH |
446 | if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) { |
447 | ip_proto = fh->nexthdr; | |
448 | goto ip_proto_again; | |
449 | } | |
450 | } | |
451 | goto out_good; | |
452 | } | |
0744dd00 | 453 | case IPPROTO_IPIP: |
fca41895 | 454 | proto = htons(ETH_P_IP); |
823b9693 | 455 | |
4b36993d | 456 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
457 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
458 | goto out_good; | |
459 | ||
fca41895 | 460 | goto ip; |
b438f940 TH |
461 | case IPPROTO_IPV6: |
462 | proto = htons(ETH_P_IPV6); | |
823b9693 | 463 | |
4b36993d | 464 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
465 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
466 | goto out_good; | |
467 | ||
b438f940 | 468 | goto ipv6; |
b3baa0fb TH |
469 | case IPPROTO_MPLS: |
470 | proto = htons(ETH_P_MPLS_UC); | |
471 | goto mpls; | |
0744dd00 ED |
472 | default: |
473 | break; | |
474 | } | |
475 | ||
20a17bf6 DM |
476 | if (dissector_uses_key(flow_dissector, |
477 | FLOW_DISSECTOR_KEY_PORTS)) { | |
06635a35 JP |
478 | key_ports = skb_flow_dissector_target(flow_dissector, |
479 | FLOW_DISSECTOR_KEY_PORTS, | |
480 | target_container); | |
481 | key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto, | |
482 | data, hlen); | |
483 | } | |
5af7fb6e | 484 | |
a6e544b0 TH |
485 | out_good: |
486 | ret = true; | |
487 | ||
488 | out_bad: | |
489 | key_basic->n_proto = proto; | |
490 | key_basic->ip_proto = ip_proto; | |
491 | key_control->thoff = (u16)nhoff; | |
492 | ||
493 | return ret; | |
0744dd00 | 494 | } |
690e36e7 | 495 | EXPORT_SYMBOL(__skb_flow_dissect); |
441d9d32 CW |
496 | |
497 | static u32 hashrnd __read_mostly; | |
66415cf8 HFS |
498 | static __always_inline void __flow_hash_secret_init(void) |
499 | { | |
500 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
501 | } | |
502 | ||
20a17bf6 DM |
503 | static __always_inline u32 __flow_hash_words(const u32 *words, u32 length, |
504 | u32 keyval) | |
42aecaa9 TH |
505 | { |
506 | return jhash2(words, length, keyval); | |
507 | } | |
508 | ||
20a17bf6 | 509 | static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow) |
66415cf8 | 510 | { |
20a17bf6 DM |
511 | const void *p = flow; |
512 | ||
42aecaa9 | 513 | BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32)); |
20a17bf6 | 514 | return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET); |
42aecaa9 TH |
515 | } |
516 | ||
20a17bf6 | 517 | static inline size_t flow_keys_hash_length(const struct flow_keys *flow) |
42aecaa9 | 518 | { |
c3f83241 | 519 | size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs); |
42aecaa9 | 520 | BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32)); |
c3f83241 TH |
521 | BUILD_BUG_ON(offsetof(typeof(*flow), addrs) != |
522 | sizeof(*flow) - sizeof(flow->addrs)); | |
523 | ||
524 | switch (flow->control.addr_type) { | |
525 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
526 | diff -= sizeof(flow->addrs.v4addrs); | |
527 | break; | |
528 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
529 | diff -= sizeof(flow->addrs.v6addrs); | |
530 | break; | |
9f249089 TH |
531 | case FLOW_DISSECTOR_KEY_TIPC_ADDRS: |
532 | diff -= sizeof(flow->addrs.tipcaddrs); | |
533 | break; | |
c3f83241 TH |
534 | } |
535 | return (sizeof(*flow) - diff) / sizeof(u32); | |
536 | } | |
537 | ||
538 | __be32 flow_get_u32_src(const struct flow_keys *flow) | |
539 | { | |
540 | switch (flow->control.addr_type) { | |
541 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
542 | return flow->addrs.v4addrs.src; | |
543 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
544 | return (__force __be32)ipv6_addr_hash( | |
545 | &flow->addrs.v6addrs.src); | |
9f249089 TH |
546 | case FLOW_DISSECTOR_KEY_TIPC_ADDRS: |
547 | return flow->addrs.tipcaddrs.srcnode; | |
c3f83241 TH |
548 | default: |
549 | return 0; | |
550 | } | |
551 | } | |
552 | EXPORT_SYMBOL(flow_get_u32_src); | |
553 | ||
554 | __be32 flow_get_u32_dst(const struct flow_keys *flow) | |
555 | { | |
556 | switch (flow->control.addr_type) { | |
557 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
558 | return flow->addrs.v4addrs.dst; | |
559 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
560 | return (__force __be32)ipv6_addr_hash( | |
561 | &flow->addrs.v6addrs.dst); | |
562 | default: | |
563 | return 0; | |
564 | } | |
565 | } | |
566 | EXPORT_SYMBOL(flow_get_u32_dst); | |
567 | ||
568 | static inline void __flow_hash_consistentify(struct flow_keys *keys) | |
569 | { | |
570 | int addr_diff, i; | |
571 | ||
572 | switch (keys->control.addr_type) { | |
573 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
574 | addr_diff = (__force u32)keys->addrs.v4addrs.dst - | |
575 | (__force u32)keys->addrs.v4addrs.src; | |
576 | if ((addr_diff < 0) || | |
577 | (addr_diff == 0 && | |
578 | ((__force u16)keys->ports.dst < | |
579 | (__force u16)keys->ports.src))) { | |
580 | swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst); | |
581 | swap(keys->ports.src, keys->ports.dst); | |
582 | } | |
583 | break; | |
584 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
585 | addr_diff = memcmp(&keys->addrs.v6addrs.dst, | |
586 | &keys->addrs.v6addrs.src, | |
587 | sizeof(keys->addrs.v6addrs.dst)); | |
588 | if ((addr_diff < 0) || | |
589 | (addr_diff == 0 && | |
590 | ((__force u16)keys->ports.dst < | |
591 | (__force u16)keys->ports.src))) { | |
592 | for (i = 0; i < 4; i++) | |
593 | swap(keys->addrs.v6addrs.src.s6_addr32[i], | |
594 | keys->addrs.v6addrs.dst.s6_addr32[i]); | |
595 | swap(keys->ports.src, keys->ports.dst); | |
596 | } | |
597 | break; | |
598 | } | |
66415cf8 HFS |
599 | } |
600 | ||
50fb7992 | 601 | static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval) |
5ed20a68 TH |
602 | { |
603 | u32 hash; | |
604 | ||
c3f83241 | 605 | __flow_hash_consistentify(keys); |
5ed20a68 | 606 | |
20a17bf6 | 607 | hash = __flow_hash_words(flow_keys_hash_start(keys), |
42aecaa9 | 608 | flow_keys_hash_length(keys), keyval); |
5ed20a68 TH |
609 | if (!hash) |
610 | hash = 1; | |
611 | ||
612 | return hash; | |
613 | } | |
614 | ||
615 | u32 flow_hash_from_keys(struct flow_keys *keys) | |
616 | { | |
50fb7992 TH |
617 | __flow_hash_secret_init(); |
618 | return __flow_hash_from_keys(keys, hashrnd); | |
5ed20a68 TH |
619 | } |
620 | EXPORT_SYMBOL(flow_hash_from_keys); | |
621 | ||
50fb7992 TH |
622 | static inline u32 ___skb_get_hash(const struct sk_buff *skb, |
623 | struct flow_keys *keys, u32 keyval) | |
624 | { | |
6db61d79 TH |
625 | skb_flow_dissect_flow_keys(skb, keys, |
626 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
50fb7992 TH |
627 | |
628 | return __flow_hash_from_keys(keys, keyval); | |
629 | } | |
630 | ||
2f59e1eb TH |
631 | struct _flow_keys_digest_data { |
632 | __be16 n_proto; | |
633 | u8 ip_proto; | |
634 | u8 padding; | |
635 | __be32 ports; | |
636 | __be32 src; | |
637 | __be32 dst; | |
638 | }; | |
639 | ||
640 | void make_flow_keys_digest(struct flow_keys_digest *digest, | |
641 | const struct flow_keys *flow) | |
642 | { | |
643 | struct _flow_keys_digest_data *data = | |
644 | (struct _flow_keys_digest_data *)digest; | |
645 | ||
646 | BUILD_BUG_ON(sizeof(*data) > sizeof(*digest)); | |
647 | ||
648 | memset(digest, 0, sizeof(*digest)); | |
649 | ||
06635a35 JP |
650 | data->n_proto = flow->basic.n_proto; |
651 | data->ip_proto = flow->basic.ip_proto; | |
652 | data->ports = flow->ports.ports; | |
c3f83241 TH |
653 | data->src = flow->addrs.v4addrs.src; |
654 | data->dst = flow->addrs.v4addrs.dst; | |
2f59e1eb TH |
655 | } |
656 | EXPORT_SYMBOL(make_flow_keys_digest); | |
657 | ||
d4fd3275 JP |
658 | /** |
659 | * __skb_get_hash: calculate a flow hash | |
660 | * @skb: sk_buff to calculate flow hash from | |
661 | * | |
662 | * This function calculates a flow hash based on src/dst addresses | |
61b905da TH |
663 | * and src/dst port numbers. Sets hash in skb to non-zero hash value |
664 | * on success, zero indicates no valid hash. Also, sets l4_hash in skb | |
441d9d32 CW |
665 | * if hash is a canonical 4-tuple hash over transport ports. |
666 | */ | |
3958afa1 | 667 | void __skb_get_hash(struct sk_buff *skb) |
441d9d32 CW |
668 | { |
669 | struct flow_keys keys; | |
441d9d32 | 670 | |
50fb7992 TH |
671 | __flow_hash_secret_init(); |
672 | ||
6db61d79 | 673 | __skb_set_sw_hash(skb, ___skb_get_hash(skb, &keys, hashrnd), |
bcc83839 | 674 | flow_keys_have_l4(&keys)); |
441d9d32 | 675 | } |
3958afa1 | 676 | EXPORT_SYMBOL(__skb_get_hash); |
441d9d32 | 677 | |
50fb7992 TH |
678 | __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb) |
679 | { | |
680 | struct flow_keys keys; | |
681 | ||
682 | return ___skb_get_hash(skb, &keys, perturb); | |
683 | } | |
684 | EXPORT_SYMBOL(skb_get_hash_perturb); | |
685 | ||
20a17bf6 | 686 | __u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6) |
f70ea018 TH |
687 | { |
688 | struct flow_keys keys; | |
689 | ||
690 | memset(&keys, 0, sizeof(keys)); | |
691 | ||
692 | memcpy(&keys.addrs.v6addrs.src, &fl6->saddr, | |
693 | sizeof(keys.addrs.v6addrs.src)); | |
694 | memcpy(&keys.addrs.v6addrs.dst, &fl6->daddr, | |
695 | sizeof(keys.addrs.v6addrs.dst)); | |
696 | keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
697 | keys.ports.src = fl6->fl6_sport; | |
698 | keys.ports.dst = fl6->fl6_dport; | |
699 | keys.keyid.keyid = fl6->fl6_gre_key; | |
700 | keys.tags.flow_label = (__force u32)fl6->flowlabel; | |
701 | keys.basic.ip_proto = fl6->flowi6_proto; | |
702 | ||
bcc83839 TH |
703 | __skb_set_sw_hash(skb, flow_hash_from_keys(&keys), |
704 | flow_keys_have_l4(&keys)); | |
f70ea018 TH |
705 | |
706 | return skb->hash; | |
707 | } | |
708 | EXPORT_SYMBOL(__skb_get_hash_flowi6); | |
709 | ||
20a17bf6 | 710 | __u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4) |
f70ea018 TH |
711 | { |
712 | struct flow_keys keys; | |
713 | ||
714 | memset(&keys, 0, sizeof(keys)); | |
715 | ||
716 | keys.addrs.v4addrs.src = fl4->saddr; | |
717 | keys.addrs.v4addrs.dst = fl4->daddr; | |
718 | keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
719 | keys.ports.src = fl4->fl4_sport; | |
720 | keys.ports.dst = fl4->fl4_dport; | |
721 | keys.keyid.keyid = fl4->fl4_gre_key; | |
722 | keys.basic.ip_proto = fl4->flowi4_proto; | |
723 | ||
bcc83839 TH |
724 | __skb_set_sw_hash(skb, flow_hash_from_keys(&keys), |
725 | flow_keys_have_l4(&keys)); | |
f70ea018 TH |
726 | |
727 | return skb->hash; | |
728 | } | |
729 | EXPORT_SYMBOL(__skb_get_hash_flowi4); | |
730 | ||
56193d1b AD |
731 | u32 __skb_get_poff(const struct sk_buff *skb, void *data, |
732 | const struct flow_keys *keys, int hlen) | |
f77668dc | 733 | { |
42aecaa9 | 734 | u32 poff = keys->control.thoff; |
f77668dc | 735 | |
06635a35 | 736 | switch (keys->basic.ip_proto) { |
f77668dc | 737 | case IPPROTO_TCP: { |
5af7fb6e AD |
738 | /* access doff as u8 to avoid unaligned access */ |
739 | const u8 *doff; | |
740 | u8 _doff; | |
f77668dc | 741 | |
5af7fb6e AD |
742 | doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff), |
743 | data, hlen, &_doff); | |
744 | if (!doff) | |
f77668dc DB |
745 | return poff; |
746 | ||
5af7fb6e | 747 | poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2); |
f77668dc DB |
748 | break; |
749 | } | |
750 | case IPPROTO_UDP: | |
751 | case IPPROTO_UDPLITE: | |
752 | poff += sizeof(struct udphdr); | |
753 | break; | |
754 | /* For the rest, we do not really care about header | |
755 | * extensions at this point for now. | |
756 | */ | |
757 | case IPPROTO_ICMP: | |
758 | poff += sizeof(struct icmphdr); | |
759 | break; | |
760 | case IPPROTO_ICMPV6: | |
761 | poff += sizeof(struct icmp6hdr); | |
762 | break; | |
763 | case IPPROTO_IGMP: | |
764 | poff += sizeof(struct igmphdr); | |
765 | break; | |
766 | case IPPROTO_DCCP: | |
767 | poff += sizeof(struct dccp_hdr); | |
768 | break; | |
769 | case IPPROTO_SCTP: | |
770 | poff += sizeof(struct sctphdr); | |
771 | break; | |
772 | } | |
773 | ||
774 | return poff; | |
775 | } | |
776 | ||
0db89b8b JP |
777 | /** |
778 | * skb_get_poff - get the offset to the payload | |
779 | * @skb: sk_buff to get the payload offset from | |
780 | * | |
781 | * The function will get the offset to the payload as far as it could | |
782 | * be dissected. The main user is currently BPF, so that we can dynamically | |
56193d1b AD |
783 | * truncate packets without needing to push actual payload to the user |
784 | * space and can analyze headers only, instead. | |
785 | */ | |
786 | u32 skb_get_poff(const struct sk_buff *skb) | |
787 | { | |
788 | struct flow_keys keys; | |
789 | ||
cd79a238 | 790 | if (!skb_flow_dissect_flow_keys(skb, &keys, 0)) |
56193d1b AD |
791 | return 0; |
792 | ||
793 | return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb)); | |
794 | } | |
06635a35 | 795 | |
20a17bf6 | 796 | __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys) |
a17ace95 DM |
797 | { |
798 | memset(keys, 0, sizeof(*keys)); | |
799 | ||
800 | memcpy(&keys->addrs.v6addrs.src, &fl6->saddr, | |
801 | sizeof(keys->addrs.v6addrs.src)); | |
802 | memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr, | |
803 | sizeof(keys->addrs.v6addrs.dst)); | |
804 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
805 | keys->ports.src = fl6->fl6_sport; | |
806 | keys->ports.dst = fl6->fl6_dport; | |
807 | keys->keyid.keyid = fl6->fl6_gre_key; | |
808 | keys->tags.flow_label = (__force u32)fl6->flowlabel; | |
809 | keys->basic.ip_proto = fl6->flowi6_proto; | |
810 | ||
811 | return flow_hash_from_keys(keys); | |
812 | } | |
813 | EXPORT_SYMBOL(__get_hash_from_flowi6); | |
814 | ||
20a17bf6 | 815 | __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys) |
a17ace95 DM |
816 | { |
817 | memset(keys, 0, sizeof(*keys)); | |
818 | ||
819 | keys->addrs.v4addrs.src = fl4->saddr; | |
820 | keys->addrs.v4addrs.dst = fl4->daddr; | |
821 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
822 | keys->ports.src = fl4->fl4_sport; | |
823 | keys->ports.dst = fl4->fl4_dport; | |
824 | keys->keyid.keyid = fl4->fl4_gre_key; | |
825 | keys->basic.ip_proto = fl4->flowi4_proto; | |
826 | ||
827 | return flow_hash_from_keys(keys); | |
828 | } | |
829 | EXPORT_SYMBOL(__get_hash_from_flowi4); | |
830 | ||
06635a35 | 831 | static const struct flow_dissector_key flow_keys_dissector_keys[] = { |
42aecaa9 TH |
832 | { |
833 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
834 | .offset = offsetof(struct flow_keys, control), | |
835 | }, | |
06635a35 JP |
836 | { |
837 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
838 | .offset = offsetof(struct flow_keys, basic), | |
839 | }, | |
840 | { | |
841 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
c3f83241 TH |
842 | .offset = offsetof(struct flow_keys, addrs.v4addrs), |
843 | }, | |
844 | { | |
845 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
846 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
06635a35 | 847 | }, |
9f249089 TH |
848 | { |
849 | .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS, | |
850 | .offset = offsetof(struct flow_keys, addrs.tipcaddrs), | |
851 | }, | |
06635a35 JP |
852 | { |
853 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
854 | .offset = offsetof(struct flow_keys, ports), | |
855 | }, | |
d34af823 TH |
856 | { |
857 | .key_id = FLOW_DISSECTOR_KEY_VLANID, | |
858 | .offset = offsetof(struct flow_keys, tags), | |
859 | }, | |
87ee9e52 TH |
860 | { |
861 | .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
862 | .offset = offsetof(struct flow_keys, tags), | |
863 | }, | |
1fdd512c TH |
864 | { |
865 | .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, | |
866 | .offset = offsetof(struct flow_keys, keyid), | |
867 | }, | |
06635a35 JP |
868 | }; |
869 | ||
870 | static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = { | |
42aecaa9 TH |
871 | { |
872 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
873 | .offset = offsetof(struct flow_keys, control), | |
874 | }, | |
06635a35 JP |
875 | { |
876 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
877 | .offset = offsetof(struct flow_keys, basic), | |
878 | }, | |
879 | }; | |
880 | ||
881 | struct flow_dissector flow_keys_dissector __read_mostly; | |
882 | EXPORT_SYMBOL(flow_keys_dissector); | |
883 | ||
884 | struct flow_dissector flow_keys_buf_dissector __read_mostly; | |
885 | ||
886 | static int __init init_default_flow_dissectors(void) | |
887 | { | |
888 | skb_flow_dissector_init(&flow_keys_dissector, | |
889 | flow_keys_dissector_keys, | |
890 | ARRAY_SIZE(flow_keys_dissector_keys)); | |
891 | skb_flow_dissector_init(&flow_keys_buf_dissector, | |
892 | flow_keys_buf_dissector_keys, | |
893 | ARRAY_SIZE(flow_keys_buf_dissector_keys)); | |
894 | return 0; | |
895 | } | |
896 | ||
897 | late_initcall_sync(init_default_flow_dissectors); |