]>
Commit | Line | Data |
---|---|---|
064af421 | 1 | /* |
8368c090 | 2 | * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks. |
064af421 | 3 | * |
a14bc59f BP |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
064af421 | 7 | * |
a14bc59f BP |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
064af421 BP |
15 | */ |
16 | #include <config.h> | |
17 | #include <sys/types.h> | |
18 | #include "flow.h" | |
db7f8281 | 19 | #include <assert.h> |
d31f1109 | 20 | #include <errno.h> |
064af421 BP |
21 | #include <inttypes.h> |
22 | #include <netinet/in.h> | |
d31f1109 JP |
23 | #include <netinet/icmp6.h> |
24 | #include <netinet/ip6.h> | |
064af421 BP |
25 | #include <stdlib.h> |
26 | #include <string.h> | |
10a24935 | 27 | #include "byte-order.h" |
064af421 BP |
28 | #include "coverage.h" |
29 | #include "dynamic-string.h" | |
30 | #include "hash.h" | |
31 | #include "ofpbuf.h" | |
32 | #include "openflow/openflow.h" | |
064af421 | 33 | #include "packets.h" |
176aaa65 | 34 | #include "unaligned.h" |
5136ce49 | 35 | #include "vlog.h" |
064af421 | 36 | |
d98e6007 | 37 | VLOG_DEFINE_THIS_MODULE(flow); |
064af421 | 38 | |
d76f09ea BP |
39 | COVERAGE_DEFINE(flow_extract); |
40 | ||
a26ef517 JP |
41 | static struct arp_eth_header * |
42 | pull_arp(struct ofpbuf *packet) | |
43 | { | |
44 | return ofpbuf_try_pull(packet, ARP_ETH_HEADER_LEN); | |
45 | } | |
46 | ||
064af421 BP |
47 | static struct ip_header * |
48 | pull_ip(struct ofpbuf *packet) | |
49 | { | |
50 | if (packet->size >= IP_HEADER_LEN) { | |
51 | struct ip_header *ip = packet->data; | |
52 | int ip_len = IP_IHL(ip->ip_ihl_ver) * 4; | |
53 | if (ip_len >= IP_HEADER_LEN && packet->size >= ip_len) { | |
54 | return ofpbuf_pull(packet, ip_len); | |
55 | } | |
56 | } | |
57 | return NULL; | |
58 | } | |
59 | ||
60 | static struct tcp_header * | |
d295e8e9 | 61 | pull_tcp(struct ofpbuf *packet) |
064af421 BP |
62 | { |
63 | if (packet->size >= TCP_HEADER_LEN) { | |
64 | struct tcp_header *tcp = packet->data; | |
65 | int tcp_len = TCP_OFFSET(tcp->tcp_ctl) * 4; | |
66 | if (tcp_len >= TCP_HEADER_LEN && packet->size >= tcp_len) { | |
67 | return ofpbuf_pull(packet, tcp_len); | |
68 | } | |
69 | } | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | static struct udp_header * | |
d295e8e9 | 74 | pull_udp(struct ofpbuf *packet) |
064af421 BP |
75 | { |
76 | return ofpbuf_try_pull(packet, UDP_HEADER_LEN); | |
77 | } | |
78 | ||
79 | static struct icmp_header * | |
d295e8e9 | 80 | pull_icmp(struct ofpbuf *packet) |
064af421 BP |
81 | { |
82 | return ofpbuf_try_pull(packet, ICMP_HEADER_LEN); | |
83 | } | |
84 | ||
d31f1109 JP |
85 | static struct icmp6_hdr * |
86 | pull_icmpv6(struct ofpbuf *packet) | |
87 | { | |
88 | return ofpbuf_try_pull(packet, sizeof(struct icmp6_hdr)); | |
89 | } | |
90 | ||
50f06e16 | 91 | static void |
ae412e7d | 92 | parse_vlan(struct ofpbuf *b, struct flow *flow) |
064af421 | 93 | { |
50f06e16 | 94 | struct qtag_prefix { |
0b3e77bb BP |
95 | ovs_be16 eth_type; /* ETH_TYPE_VLAN */ |
96 | ovs_be16 tci; | |
50f06e16 BP |
97 | }; |
98 | ||
0b3e77bb | 99 | if (b->size >= sizeof(struct qtag_prefix) + sizeof(ovs_be16)) { |
50f06e16 | 100 | struct qtag_prefix *qp = ofpbuf_pull(b, sizeof *qp); |
66642cb4 | 101 | flow->vlan_tci = qp->tci | htons(VLAN_CFI); |
50f06e16 | 102 | } |
064af421 BP |
103 | } |
104 | ||
0b3e77bb | 105 | static ovs_be16 |
50f06e16 | 106 | parse_ethertype(struct ofpbuf *b) |
064af421 | 107 | { |
50f06e16 | 108 | struct llc_snap_header *llc; |
0b3e77bb | 109 | ovs_be16 proto; |
50f06e16 | 110 | |
0b3e77bb | 111 | proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto); |
36956a7d | 112 | if (ntohs(proto) >= ETH_TYPE_MIN) { |
50f06e16 BP |
113 | return proto; |
114 | } | |
115 | ||
116 | if (b->size < sizeof *llc) { | |
36956a7d | 117 | return htons(FLOW_DL_TYPE_NONE); |
50f06e16 BP |
118 | } |
119 | ||
120 | llc = b->data; | |
121 | if (llc->llc.llc_dsap != LLC_DSAP_SNAP | |
122 | || llc->llc.llc_ssap != LLC_SSAP_SNAP | |
123 | || llc->llc.llc_cntl != LLC_CNTL_SNAP | |
124 | || memcmp(llc->snap.snap_org, SNAP_ORG_ETHERNET, | |
125 | sizeof llc->snap.snap_org)) { | |
36956a7d | 126 | return htons(FLOW_DL_TYPE_NONE); |
50f06e16 BP |
127 | } |
128 | ||
129 | ofpbuf_pull(b, sizeof *llc); | |
130 | return llc->snap.snap_type; | |
064af421 BP |
131 | } |
132 | ||
d31f1109 JP |
133 | static int |
134 | parse_ipv6(struct ofpbuf *packet, struct flow *flow) | |
135 | { | |
88366484 | 136 | const struct ip6_hdr *nh; |
d31f1109 JP |
137 | ovs_be32 tc_flow; |
138 | int nexthdr; | |
139 | ||
88366484 JG |
140 | nh = ofpbuf_try_pull(packet, sizeof *nh); |
141 | if (!nh) { | |
142 | return EINVAL; | |
d31f1109 JP |
143 | } |
144 | ||
d31f1109 | 145 | nexthdr = nh->ip6_nxt; |
d31f1109 JP |
146 | |
147 | flow->ipv6_src = nh->ip6_src; | |
148 | flow->ipv6_dst = nh->ip6_dst; | |
149 | ||
150 | tc_flow = get_unaligned_be32(&nh->ip6_flow); | |
eadef313 | 151 | flow->nw_tos = ntohl(tc_flow) >> 4; |
fa8223b7 | 152 | flow->ipv6_label = tc_flow & htonl(IPV6_LABEL_MASK); |
a61680c6 | 153 | flow->nw_ttl = nh->ip6_hlim; |
d31f1109 JP |
154 | flow->nw_proto = IPPROTO_NONE; |
155 | ||
d31f1109 JP |
156 | while (1) { |
157 | if ((nexthdr != IPPROTO_HOPOPTS) | |
158 | && (nexthdr != IPPROTO_ROUTING) | |
159 | && (nexthdr != IPPROTO_DSTOPTS) | |
160 | && (nexthdr != IPPROTO_AH) | |
161 | && (nexthdr != IPPROTO_FRAGMENT)) { | |
162 | /* It's either a terminal header (e.g., TCP, UDP) or one we | |
163 | * don't understand. In either case, we're done with the | |
164 | * packet, so use it to fill in 'nw_proto'. */ | |
165 | break; | |
166 | } | |
167 | ||
168 | /* We only verify that at least 8 bytes of the next header are | |
169 | * available, but many of these headers are longer. Ensure that | |
170 | * accesses within the extension header are within those first 8 | |
88366484 | 171 | * bytes. All extension headers are required to be at least 8 |
d31f1109 | 172 | * bytes. */ |
88366484 JG |
173 | if (packet->size < 8) { |
174 | return EINVAL; | |
d31f1109 JP |
175 | } |
176 | ||
177 | if ((nexthdr == IPPROTO_HOPOPTS) | |
178 | || (nexthdr == IPPROTO_ROUTING) | |
179 | || (nexthdr == IPPROTO_DSTOPTS)) { | |
180 | /* These headers, while different, have the fields we care about | |
181 | * in the same location and with the same interpretation. */ | |
88366484 | 182 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)packet->data; |
d31f1109 | 183 | nexthdr = ext_hdr->ip6e_nxt; |
88366484 JG |
184 | if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 1) * 8)) { |
185 | return EINVAL; | |
186 | } | |
d31f1109 JP |
187 | } else if (nexthdr == IPPROTO_AH) { |
188 | /* A standard AH definition isn't available, but the fields | |
189 | * we care about are in the same location as the generic | |
190 | * option header--only the header length is calculated | |
191 | * differently. */ | |
88366484 | 192 | const struct ip6_ext *ext_hdr = (struct ip6_ext *)packet->data; |
d31f1109 | 193 | nexthdr = ext_hdr->ip6e_nxt; |
88366484 JG |
194 | if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 2) * 4)) { |
195 | return EINVAL; | |
196 | } | |
d31f1109 | 197 | } else if (nexthdr == IPPROTO_FRAGMENT) { |
88366484 | 198 | const struct ip6_frag *frag_hdr = (struct ip6_frag *)packet->data; |
d31f1109 JP |
199 | |
200 | nexthdr = frag_hdr->ip6f_nxt; | |
88366484 JG |
201 | if (!ofpbuf_try_pull(packet, sizeof *frag_hdr)) { |
202 | return EINVAL; | |
203 | } | |
d31f1109 JP |
204 | |
205 | /* We only process the first fragment. */ | |
eadef313 | 206 | flow->nw_frag = FLOW_NW_FRAG_ANY; |
d31f1109 | 207 | if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) != htons(0)) { |
eadef313 | 208 | flow->nw_frag |= FLOW_NW_FRAG_LATER; |
d31f1109 JP |
209 | nexthdr = IPPROTO_FRAGMENT; |
210 | break; | |
211 | } | |
212 | } | |
213 | } | |
214 | ||
d31f1109 | 215 | flow->nw_proto = nexthdr; |
88366484 | 216 | return 0; |
d31f1109 JP |
217 | } |
218 | ||
88366484 JG |
219 | static void |
220 | parse_tcp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow) | |
221 | { | |
222 | const struct tcp_header *tcp = pull_tcp(b); | |
223 | if (tcp) { | |
224 | flow->tp_src = tcp->tcp_src; | |
225 | flow->tp_dst = tcp->tcp_dst; | |
226 | packet->l7 = b->data; | |
227 | } | |
228 | } | |
229 | ||
230 | static void | |
231 | parse_udp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow) | |
232 | { | |
233 | const struct udp_header *udp = pull_udp(b); | |
234 | if (udp) { | |
235 | flow->tp_src = udp->udp_src; | |
236 | flow->tp_dst = udp->udp_dst; | |
237 | packet->l7 = b->data; | |
238 | } | |
239 | } | |
685a51a5 JP |
240 | |
241 | static bool | |
88366484 | 242 | parse_icmpv6(struct ofpbuf *b, struct flow *flow) |
685a51a5 JP |
243 | { |
244 | const struct icmp6_hdr *icmp = pull_icmpv6(b); | |
245 | ||
246 | if (!icmp) { | |
247 | return false; | |
248 | } | |
249 | ||
250 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
251 | * fields, so we need to store them in 16-bit network byte order. */ | |
3ee8a9f0 BP |
252 | flow->tp_src = htons(icmp->icmp6_type); |
253 | flow->tp_dst = htons(icmp->icmp6_code); | |
685a51a5 | 254 | |
88366484 JG |
255 | if (icmp->icmp6_code == 0 && |
256 | (icmp->icmp6_type == ND_NEIGHBOR_SOLICIT || | |
257 | icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) { | |
258 | const struct in6_addr *nd_target; | |
685a51a5 | 259 | |
88366484 JG |
260 | nd_target = ofpbuf_try_pull(b, sizeof *nd_target); |
261 | if (!nd_target) { | |
685a51a5 JP |
262 | return false; |
263 | } | |
88366484 | 264 | flow->nd_target = *nd_target; |
685a51a5 | 265 | |
88366484 | 266 | while (b->size >= 8) { |
685a51a5 JP |
267 | /* The minimum size of an option is 8 bytes, which also is |
268 | * the size of Ethernet link-layer options. */ | |
88366484 JG |
269 | const struct nd_opt_hdr *nd_opt = b->data; |
270 | int opt_len = nd_opt->nd_opt_len * 8; | |
271 | ||
272 | if (!opt_len || opt_len > b->size) { | |
685a51a5 JP |
273 | goto invalid; |
274 | } | |
685a51a5 JP |
275 | |
276 | /* Store the link layer address if the appropriate option is | |
277 | * provided. It is considered an error if the same link | |
278 | * layer option is specified twice. */ | |
279 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR | |
280 | && opt_len == 8) { | |
281 | if (eth_addr_is_zero(flow->arp_sha)) { | |
88366484 | 282 | memcpy(flow->arp_sha, nd_opt + 1, ETH_ADDR_LEN); |
685a51a5 JP |
283 | } else { |
284 | goto invalid; | |
285 | } | |
286 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR | |
287 | && opt_len == 8) { | |
288 | if (eth_addr_is_zero(flow->arp_tha)) { | |
88366484 | 289 | memcpy(flow->arp_tha, nd_opt + 1, ETH_ADDR_LEN); |
685a51a5 JP |
290 | } else { |
291 | goto invalid; | |
292 | } | |
293 | } | |
294 | ||
88366484 | 295 | if (!ofpbuf_try_pull(b, opt_len)) { |
685a51a5 JP |
296 | goto invalid; |
297 | } | |
685a51a5 JP |
298 | } |
299 | } | |
300 | ||
301 | return true; | |
302 | ||
303 | invalid: | |
88366484 JG |
304 | memset(&flow->nd_target, 0, sizeof(flow->nd_target)); |
305 | memset(flow->arp_sha, 0, sizeof(flow->arp_sha)); | |
306 | memset(flow->arp_tha, 0, sizeof(flow->arp_tha)); | |
685a51a5 JP |
307 | |
308 | return false; | |
309 | ||
310 | } | |
311 | ||
abe529af | 312 | /* Initializes 'flow' members from 'packet', 'tun_id', and 'ofp_in_port'. |
0b3e77bb | 313 | * Initializes 'packet' header pointers as follows: |
ca78c6b6 BP |
314 | * |
315 | * - packet->l2 to the start of the Ethernet header. | |
316 | * | |
317 | * - packet->l3 to just past the Ethernet header, or just past the | |
318 | * vlan_header if one is present, to the first byte of the payload of the | |
319 | * Ethernet frame. | |
320 | * | |
321 | * - packet->l4 to just past the IPv4 header, if one is present and has a | |
322 | * correct length, and otherwise NULL. | |
323 | * | |
324 | * - packet->l7 to just past the TCP or UDP or ICMP header, if one is | |
325 | * present and has a correct length, and otherwise NULL. | |
326 | */ | |
7257b535 | 327 | void |
abff858b PS |
328 | flow_extract(struct ofpbuf *packet, uint32_t priority, ovs_be64 tun_id, |
329 | uint16_t ofp_in_port, struct flow *flow) | |
064af421 BP |
330 | { |
331 | struct ofpbuf b = *packet; | |
332 | struct eth_header *eth; | |
064af421 BP |
333 | |
334 | COVERAGE_INC(flow_extract); | |
335 | ||
336 | memset(flow, 0, sizeof *flow); | |
659586ef | 337 | flow->tun_id = tun_id; |
abe529af | 338 | flow->in_port = ofp_in_port; |
abff858b | 339 | flow->priority = priority; |
064af421 BP |
340 | |
341 | packet->l2 = b.data; | |
342 | packet->l3 = NULL; | |
343 | packet->l4 = NULL; | |
344 | packet->l7 = NULL; | |
345 | ||
50f06e16 | 346 | if (b.size < sizeof *eth) { |
7257b535 | 347 | return; |
50f06e16 | 348 | } |
064af421 | 349 | |
50f06e16 BP |
350 | /* Link layer. */ |
351 | eth = b.data; | |
352 | memcpy(flow->dl_src, eth->eth_src, ETH_ADDR_LEN); | |
353 | memcpy(flow->dl_dst, eth->eth_dst, ETH_ADDR_LEN); | |
354 | ||
66642cb4 | 355 | /* dl_type, vlan_tci. */ |
50f06e16 BP |
356 | ofpbuf_pull(&b, ETH_ADDR_LEN * 2); |
357 | if (eth->eth_type == htons(ETH_TYPE_VLAN)) { | |
358 | parse_vlan(&b, flow); | |
359 | } | |
360 | flow->dl_type = parse_ethertype(&b); | |
361 | ||
362 | /* Network layer. */ | |
363 | packet->l3 = b.data; | |
364 | if (flow->dl_type == htons(ETH_TYPE_IP)) { | |
365 | const struct ip_header *nh = pull_ip(&b); | |
366 | if (nh) { | |
7257b535 BP |
367 | packet->l4 = b.data; |
368 | ||
9ea5d2d5 BP |
369 | flow->nw_src = get_unaligned_be32(&nh->ip_src); |
370 | flow->nw_dst = get_unaligned_be32(&nh->ip_dst); | |
50f06e16 | 371 | flow->nw_proto = nh->ip_proto; |
7257b535 | 372 | |
eadef313 | 373 | flow->nw_tos = nh->ip_tos; |
7257b535 | 374 | if (IP_IS_FRAGMENT(nh->ip_frag_off)) { |
eadef313 | 375 | flow->nw_frag = FLOW_NW_FRAG_ANY; |
7257b535 | 376 | if (nh->ip_frag_off & htons(IP_FRAG_OFF_MASK)) { |
eadef313 | 377 | flow->nw_frag |= FLOW_NW_FRAG_LATER; |
7257b535 BP |
378 | } |
379 | } | |
a61680c6 | 380 | flow->nw_ttl = nh->ip_ttl; |
7257b535 BP |
381 | |
382 | if (!(nh->ip_frag_off & htons(IP_FRAG_OFF_MASK))) { | |
6767a2cc | 383 | if (flow->nw_proto == IPPROTO_TCP) { |
88366484 | 384 | parse_tcp(packet, &b, flow); |
6767a2cc | 385 | } else if (flow->nw_proto == IPPROTO_UDP) { |
88366484 | 386 | parse_udp(packet, &b, flow); |
6767a2cc | 387 | } else if (flow->nw_proto == IPPROTO_ICMP) { |
50f06e16 BP |
388 | const struct icmp_header *icmp = pull_icmp(&b); |
389 | if (icmp) { | |
3ee8a9f0 BP |
390 | flow->tp_src = htons(icmp->icmp_type); |
391 | flow->tp_dst = htons(icmp->icmp_code); | |
50f06e16 | 392 | packet->l7 = b.data; |
064af421 | 393 | } |
064af421 | 394 | } |
50f06e16 BP |
395 | } |
396 | } | |
d31f1109 | 397 | } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) { |
7257b535 BP |
398 | if (parse_ipv6(&b, flow)) { |
399 | return; | |
d31f1109 JP |
400 | } |
401 | ||
88366484 JG |
402 | packet->l4 = b.data; |
403 | if (flow->nw_proto == IPPROTO_TCP) { | |
404 | parse_tcp(packet, &b, flow); | |
405 | } else if (flow->nw_proto == IPPROTO_UDP) { | |
406 | parse_udp(packet, &b, flow); | |
407 | } else if (flow->nw_proto == IPPROTO_ICMPV6) { | |
408 | if (parse_icmpv6(&b, flow)) { | |
409 | packet->l7 = b.data; | |
d31f1109 JP |
410 | } |
411 | } | |
50f06e16 BP |
412 | } else if (flow->dl_type == htons(ETH_TYPE_ARP)) { |
413 | const struct arp_eth_header *arp = pull_arp(&b); | |
414 | if (arp && arp->ar_hrd == htons(1) | |
d295e8e9 | 415 | && arp->ar_pro == htons(ETH_TYPE_IP) |
50f06e16 BP |
416 | && arp->ar_hln == ETH_ADDR_LEN |
417 | && arp->ar_pln == 4) { | |
418 | /* We only match on the lower 8 bits of the opcode. */ | |
419 | if (ntohs(arp->ar_op) <= 0xff) { | |
420 | flow->nw_proto = ntohs(arp->ar_op); | |
064af421 | 421 | } |
a26ef517 | 422 | |
d295e8e9 | 423 | if ((flow->nw_proto == ARP_OP_REQUEST) |
50f06e16 BP |
424 | || (flow->nw_proto == ARP_OP_REPLY)) { |
425 | flow->nw_src = arp->ar_spa; | |
426 | flow->nw_dst = arp->ar_tpa; | |
bad68a99 JP |
427 | memcpy(flow->arp_sha, arp->ar_sha, ETH_ADDR_LEN); |
428 | memcpy(flow->arp_tha, arp->ar_tha, ETH_ADDR_LEN); | |
a26ef517 | 429 | } |
064af421 BP |
430 | } |
431 | } | |
064af421 BP |
432 | } |
433 | ||
993410fb BP |
434 | /* For every bit of a field that is wildcarded in 'wildcards', sets the |
435 | * corresponding bit in 'flow' to zero. */ | |
436 | void | |
437 | flow_zero_wildcards(struct flow *flow, const struct flow_wildcards *wildcards) | |
438 | { | |
439 | const flow_wildcards_t wc = wildcards->wildcards; | |
440 | int i; | |
441 | ||
2486e66a | 442 | BUILD_ASSERT_DECL(FLOW_WC_SEQ == 7); |
993410fb BP |
443 | |
444 | for (i = 0; i < FLOW_N_REGS; i++) { | |
445 | flow->regs[i] &= wildcards->reg_masks[i]; | |
446 | } | |
447 | flow->tun_id &= wildcards->tun_id_mask; | |
448 | flow->nw_src &= wildcards->nw_src_mask; | |
449 | flow->nw_dst &= wildcards->nw_dst_mask; | |
450 | if (wc & FWW_IN_PORT) { | |
451 | flow->in_port = 0; | |
452 | } | |
453 | flow->vlan_tci &= wildcards->vlan_tci_mask; | |
454 | if (wc & FWW_DL_TYPE) { | |
cb9457e2 | 455 | flow->dl_type = htons(0); |
993410fb BP |
456 | } |
457 | if (wc & FWW_TP_SRC) { | |
cb9457e2 | 458 | flow->tp_src = htons(0); |
993410fb BP |
459 | } |
460 | if (wc & FWW_TP_DST) { | |
cb9457e2 | 461 | flow->tp_dst = htons(0); |
993410fb BP |
462 | } |
463 | if (wc & FWW_DL_SRC) { | |
464 | memset(flow->dl_src, 0, sizeof flow->dl_src); | |
465 | } | |
466 | if (wc & FWW_DL_DST) { | |
467 | flow->dl_dst[0] &= 0x01; | |
468 | memset(&flow->dl_dst[1], 0, 5); | |
469 | } | |
470 | if (wc & FWW_ETH_MCAST) { | |
471 | flow->dl_dst[0] &= 0xfe; | |
472 | } | |
473 | if (wc & FWW_NW_PROTO) { | |
474 | flow->nw_proto = 0; | |
475 | } | |
fa8223b7 JP |
476 | if (wc & FWW_IPV6_LABEL) { |
477 | flow->ipv6_label = htonl(0); | |
478 | } | |
2486e66a JP |
479 | if (wc & FWW_NW_DSCP) { |
480 | flow->nw_tos &= ~IP_DSCP_MASK; | |
481 | } | |
482 | if (wc & FWW_NW_ECN) { | |
483 | flow->nw_tos &= ~IP_ECN_MASK; | |
484 | } | |
a61680c6 JP |
485 | if (wc & FWW_NW_TTL) { |
486 | flow->nw_ttl = 0; | |
487 | } | |
eadef313 | 488 | flow->nw_frag &= wildcards->nw_frag_mask; |
993410fb BP |
489 | if (wc & FWW_ARP_SHA) { |
490 | memset(flow->arp_sha, 0, sizeof flow->arp_sha); | |
491 | } | |
492 | if (wc & FWW_ARP_THA) { | |
493 | memset(flow->arp_tha, 0, sizeof flow->arp_tha); | |
494 | } | |
495 | flow->ipv6_src = ipv6_addr_bitand(&flow->ipv6_src, | |
496 | &wildcards->ipv6_src_mask); | |
497 | flow->ipv6_dst = ipv6_addr_bitand(&flow->ipv6_dst, | |
498 | &wildcards->ipv6_dst_mask); | |
499 | if (wc & FWW_ND_TARGET) { | |
500 | memset(&flow->nd_target, 0, sizeof flow->nd_target); | |
501 | } | |
abff858b | 502 | flow->priority = 0; |
993410fb BP |
503 | } |
504 | ||
064af421 | 505 | char * |
ae412e7d | 506 | flow_to_string(const struct flow *flow) |
064af421 BP |
507 | { |
508 | struct ds ds = DS_EMPTY_INITIALIZER; | |
509 | flow_format(&ds, flow); | |
510 | return ds_cstr(&ds); | |
511 | } | |
512 | ||
513 | void | |
ae412e7d | 514 | flow_format(struct ds *ds, const struct flow *flow) |
064af421 | 515 | { |
abff858b PS |
516 | ds_put_format(ds, "priority%"PRIu32 |
517 | ":tunnel%#"PRIx64 | |
518 | ":in_port%04"PRIx16, | |
519 | flow->priority, | |
520 | ntohll(flow->tun_id), | |
521 | flow->in_port); | |
522 | ||
523 | ds_put_format(ds, ":tci("); | |
66642cb4 BP |
524 | if (flow->vlan_tci) { |
525 | ds_put_format(ds, "vlan%"PRIu16",pcp%d", | |
526 | vlan_tci_to_vid(flow->vlan_tci), | |
527 | vlan_tci_to_pcp(flow->vlan_tci)); | |
528 | } else { | |
529 | ds_put_char(ds, '0'); | |
530 | } | |
531 | ds_put_format(ds, ") mac"ETH_ADDR_FMT"->"ETH_ADDR_FMT | |
d31f1109 | 532 | " type%04"PRIx16, |
659586ef JG |
533 | ETH_ADDR_ARGS(flow->dl_src), |
534 | ETH_ADDR_ARGS(flow->dl_dst), | |
d31f1109 JP |
535 | ntohs(flow->dl_type)); |
536 | ||
537 | if (flow->dl_type == htons(ETH_TYPE_IPV6)) { | |
a61680c6 JP |
538 | ds_put_format(ds, " label%#"PRIx32" proto%"PRIu8" tos%#"PRIx8 |
539 | " ttl%"PRIu8" ipv6", | |
540 | ntohl(flow->ipv6_label), flow->nw_proto, | |
eadef313 | 541 | flow->nw_tos, flow->nw_ttl); |
d31f1109 JP |
542 | print_ipv6_addr(ds, &flow->ipv6_src); |
543 | ds_put_cstr(ds, "->"); | |
544 | print_ipv6_addr(ds, &flow->ipv6_dst); | |
b53055f4 | 545 | |
d31f1109 | 546 | } else { |
a61680c6 JP |
547 | ds_put_format(ds, " proto%"PRIu8" tos%#"PRIx8" ttl%"PRIu8 |
548 | " ip"IP_FMT"->"IP_FMT, | |
eadef313 | 549 | flow->nw_proto, flow->nw_tos, flow->nw_ttl, |
a61680c6 | 550 | IP_ARGS(&flow->nw_src), IP_ARGS(&flow->nw_dst)); |
d31f1109 | 551 | } |
eadef313 | 552 | if (flow->nw_frag) { |
7257b535 | 553 | ds_put_format(ds, " frag(%s)", |
eadef313 JP |
554 | flow->nw_frag == FLOW_NW_FRAG_ANY ? "first" |
555 | : flow->nw_frag == (FLOW_NW_FRAG_ANY | FLOW_NW_FRAG_LATER) | |
9e44d715 | 556 | ? "later" : "<error>"); |
7257b535 | 557 | } |
bad68a99 JP |
558 | if (flow->tp_src || flow->tp_dst) { |
559 | ds_put_format(ds, " port%"PRIu16"->%"PRIu16, | |
560 | ntohs(flow->tp_src), ntohs(flow->tp_dst)); | |
561 | } | |
562 | if (!eth_addr_is_zero(flow->arp_sha) || !eth_addr_is_zero(flow->arp_tha)) { | |
563 | ds_put_format(ds, " arp_ha"ETH_ADDR_FMT"->"ETH_ADDR_FMT, | |
564 | ETH_ADDR_ARGS(flow->arp_sha), | |
565 | ETH_ADDR_ARGS(flow->arp_tha)); | |
566 | } | |
064af421 BP |
567 | } |
568 | ||
569 | void | |
ae412e7d | 570 | flow_print(FILE *stream, const struct flow *flow) |
064af421 BP |
571 | { |
572 | char *s = flow_to_string(flow); | |
573 | fputs(s, stream); | |
574 | free(s); | |
575 | } | |
54363004 BP |
576 | \f |
577 | /* flow_wildcards functions. */ | |
578 | ||
d8ae4d67 | 579 | /* Initializes 'wc' as a set of wildcards that matches every packet. */ |
54363004 | 580 | void |
d8ae4d67 | 581 | flow_wildcards_init_catchall(struct flow_wildcards *wc) |
54363004 | 582 | { |
2486e66a | 583 | BUILD_ASSERT_DECL(FLOW_WC_SEQ == 7); |
7257b535 | 584 | |
d8ae4d67 | 585 | wc->wildcards = FWW_ALL; |
8368c090 | 586 | wc->tun_id_mask = htonll(0); |
d8ae4d67 BP |
587 | wc->nw_src_mask = htonl(0); |
588 | wc->nw_dst_mask = htonl(0); | |
d31f1109 JP |
589 | wc->ipv6_src_mask = in6addr_any; |
590 | wc->ipv6_dst_mask = in6addr_any; | |
b6c9e612 | 591 | memset(wc->reg_masks, 0, sizeof wc->reg_masks); |
66642cb4 | 592 | wc->vlan_tci_mask = htons(0); |
eadef313 | 593 | wc->nw_frag_mask = 0; |
dc56021d | 594 | memset(wc->zeros, 0, sizeof wc->zeros); |
54363004 BP |
595 | } |
596 | ||
494e43a5 BP |
597 | /* Initializes 'wc' as an exact-match set of wildcards; that is, 'wc' does not |
598 | * wildcard any bits or fields. */ | |
599 | void | |
600 | flow_wildcards_init_exact(struct flow_wildcards *wc) | |
601 | { | |
2486e66a | 602 | BUILD_ASSERT_DECL(FLOW_WC_SEQ == 7); |
7257b535 | 603 | |
b6c9e612 | 604 | wc->wildcards = 0; |
8368c090 | 605 | wc->tun_id_mask = htonll(UINT64_MAX); |
b6c9e612 BP |
606 | wc->nw_src_mask = htonl(UINT32_MAX); |
607 | wc->nw_dst_mask = htonl(UINT32_MAX); | |
d31f1109 JP |
608 | wc->ipv6_src_mask = in6addr_exact; |
609 | wc->ipv6_dst_mask = in6addr_exact; | |
b6c9e612 | 610 | memset(wc->reg_masks, 0xff, sizeof wc->reg_masks); |
66642cb4 | 611 | wc->vlan_tci_mask = htons(UINT16_MAX); |
eadef313 | 612 | wc->nw_frag_mask = UINT8_MAX; |
dc56021d | 613 | memset(wc->zeros, 0, sizeof wc->zeros); |
494e43a5 BP |
614 | } |
615 | ||
00561f41 BP |
616 | /* Returns true if 'wc' is exact-match, false if 'wc' wildcards any bits or |
617 | * fields. */ | |
618 | bool | |
619 | flow_wildcards_is_exact(const struct flow_wildcards *wc) | |
620 | { | |
d8ae4d67 | 621 | int i; |
00561f41 | 622 | |
2486e66a | 623 | BUILD_ASSERT_DECL(FLOW_WC_SEQ == 7); |
ecf1e7ac | 624 | |
d8ae4d67 | 625 | if (wc->wildcards |
8368c090 | 626 | || wc->tun_id_mask != htonll(UINT64_MAX) |
d8ae4d67 | 627 | || wc->nw_src_mask != htonl(UINT32_MAX) |
66642cb4 | 628 | || wc->nw_dst_mask != htonl(UINT32_MAX) |
d31f1109 JP |
629 | || wc->vlan_tci_mask != htons(UINT16_MAX) |
630 | || !ipv6_mask_is_exact(&wc->ipv6_src_mask) | |
7257b535 | 631 | || !ipv6_mask_is_exact(&wc->ipv6_dst_mask) |
eadef313 | 632 | || wc->nw_frag_mask != UINT8_MAX) { |
d8ae4d67 BP |
633 | return false; |
634 | } | |
635 | ||
636 | for (i = 0; i < FLOW_N_REGS; i++) { | |
d84d4b88 | 637 | if (wc->reg_masks[i] != UINT32_MAX) { |
d8ae4d67 BP |
638 | return false; |
639 | } | |
640 | } | |
641 | ||
642 | return true; | |
b5d97350 BP |
643 | } |
644 | ||
ecf1e7ac BP |
645 | /* Returns true if 'wc' matches every packet, false if 'wc' fixes any bits or |
646 | * fields. */ | |
647 | bool | |
648 | flow_wildcards_is_catchall(const struct flow_wildcards *wc) | |
649 | { | |
650 | int i; | |
651 | ||
2486e66a | 652 | BUILD_ASSERT_DECL(FLOW_WC_SEQ == 7); |
ecf1e7ac BP |
653 | |
654 | if (wc->wildcards != FWW_ALL | |
655 | || wc->tun_id_mask != htonll(0) | |
656 | || wc->nw_src_mask != htonl(0) | |
657 | || wc->nw_dst_mask != htonl(0) | |
658 | || wc->vlan_tci_mask != htons(0) | |
659 | || !ipv6_mask_is_any(&wc->ipv6_src_mask) | |
7257b535 | 660 | || !ipv6_mask_is_any(&wc->ipv6_dst_mask) |
eadef313 | 661 | || wc->nw_frag_mask != 0) { |
ecf1e7ac BP |
662 | return false; |
663 | } | |
664 | ||
665 | for (i = 0; i < FLOW_N_REGS; i++) { | |
666 | if (wc->reg_masks[i] != 0) { | |
667 | return false; | |
668 | } | |
669 | } | |
670 | ||
671 | return true; | |
672 | } | |
673 | ||
b5d97350 BP |
674 | /* Initializes 'dst' as the combination of wildcards in 'src1' and 'src2'. |
675 | * That is, a bit or a field is wildcarded in 'dst' if it is wildcarded in | |
676 | * 'src1' or 'src2' or both. */ | |
677 | void | |
678 | flow_wildcards_combine(struct flow_wildcards *dst, | |
679 | const struct flow_wildcards *src1, | |
680 | const struct flow_wildcards *src2) | |
681 | { | |
b6c9e612 | 682 | int i; |
b5d97350 | 683 | |
d8ae4d67 | 684 | dst->wildcards = src1->wildcards | src2->wildcards; |
8368c090 | 685 | dst->tun_id_mask = src1->tun_id_mask & src2->tun_id_mask; |
b5d97350 BP |
686 | dst->nw_src_mask = src1->nw_src_mask & src2->nw_src_mask; |
687 | dst->nw_dst_mask = src1->nw_dst_mask & src2->nw_dst_mask; | |
d31f1109 JP |
688 | dst->ipv6_src_mask = ipv6_addr_bitand(&src1->ipv6_src_mask, |
689 | &src2->ipv6_src_mask); | |
690 | dst->ipv6_dst_mask = ipv6_addr_bitand(&src1->ipv6_dst_mask, | |
691 | &src2->ipv6_dst_mask); | |
b6c9e612 BP |
692 | for (i = 0; i < FLOW_N_REGS; i++) { |
693 | dst->reg_masks[i] = src1->reg_masks[i] & src2->reg_masks[i]; | |
694 | } | |
66642cb4 | 695 | dst->vlan_tci_mask = src1->vlan_tci_mask & src2->vlan_tci_mask; |
b5d97350 BP |
696 | } |
697 | ||
698 | /* Returns a hash of the wildcards in 'wc'. */ | |
699 | uint32_t | |
1006cda6 | 700 | flow_wildcards_hash(const struct flow_wildcards *wc, uint32_t basis) |
b5d97350 | 701 | { |
d8ae4d67 BP |
702 | /* If you change struct flow_wildcards and thereby trigger this |
703 | * assertion, please check that the new struct flow_wildcards has no holes | |
704 | * in it before you update the assertion. */ | |
dc56021d | 705 | BUILD_ASSERT_DECL(sizeof *wc == 60 + FLOW_N_REGS * 4); |
1006cda6 | 706 | return hash_bytes(wc, sizeof *wc, basis); |
b5d97350 BP |
707 | } |
708 | ||
709 | /* Returns true if 'a' and 'b' represent the same wildcards, false if they are | |
710 | * different. */ | |
711 | bool | |
712 | flow_wildcards_equal(const struct flow_wildcards *a, | |
713 | const struct flow_wildcards *b) | |
714 | { | |
b6c9e612 BP |
715 | int i; |
716 | ||
d8ae4d67 | 717 | if (a->wildcards != b->wildcards |
8368c090 | 718 | || a->tun_id_mask != b->tun_id_mask |
d8ae4d67 | 719 | || a->nw_src_mask != b->nw_src_mask |
66642cb4 | 720 | || a->nw_dst_mask != b->nw_dst_mask |
b53055f4 | 721 | || a->vlan_tci_mask != b->vlan_tci_mask |
d31f1109 JP |
722 | || !ipv6_addr_equals(&a->ipv6_src_mask, &b->ipv6_src_mask) |
723 | || !ipv6_addr_equals(&a->ipv6_dst_mask, &b->ipv6_dst_mask)) { | |
b6c9e612 BP |
724 | return false; |
725 | } | |
726 | ||
727 | for (i = 0; i < FLOW_N_REGS; i++) { | |
728 | if (a->reg_masks[i] != b->reg_masks[i]) { | |
729 | return false; | |
730 | } | |
731 | } | |
732 | ||
733 | return true; | |
b5d97350 BP |
734 | } |
735 | ||
736 | /* Returns true if at least one bit or field is wildcarded in 'a' but not in | |
737 | * 'b', false otherwise. */ | |
738 | bool | |
739 | flow_wildcards_has_extra(const struct flow_wildcards *a, | |
740 | const struct flow_wildcards *b) | |
741 | { | |
b6c9e612 | 742 | int i; |
d31f1109 | 743 | struct in6_addr ipv6_masked; |
b6c9e612 BP |
744 | |
745 | for (i = 0; i < FLOW_N_REGS; i++) { | |
746 | if ((a->reg_masks[i] & b->reg_masks[i]) != b->reg_masks[i]) { | |
747 | return true; | |
748 | } | |
749 | } | |
750 | ||
d31f1109 JP |
751 | ipv6_masked = ipv6_addr_bitand(&a->ipv6_src_mask, &b->ipv6_src_mask); |
752 | if (!ipv6_addr_equals(&ipv6_masked, &b->ipv6_src_mask)) { | |
753 | return true; | |
754 | } | |
755 | ||
756 | ipv6_masked = ipv6_addr_bitand(&a->ipv6_dst_mask, &b->ipv6_dst_mask); | |
757 | if (!ipv6_addr_equals(&ipv6_masked, &b->ipv6_dst_mask)) { | |
758 | return true; | |
759 | } | |
760 | ||
d8ae4d67 | 761 | return (a->wildcards & ~b->wildcards |
8368c090 | 762 | || (a->tun_id_mask & b->tun_id_mask) != b->tun_id_mask |
b5d97350 | 763 | || (a->nw_src_mask & b->nw_src_mask) != b->nw_src_mask |
66642cb4 BP |
764 | || (a->nw_dst_mask & b->nw_dst_mask) != b->nw_dst_mask |
765 | || (a->vlan_tci_mask & b->vlan_tci_mask) != b->vlan_tci_mask); | |
b5d97350 BP |
766 | } |
767 | ||
b6c9e612 BP |
768 | /* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'. |
769 | * (A 0-bit indicates a wildcard bit.) */ | |
770 | void | |
771 | flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask) | |
772 | { | |
d8ae4d67 | 773 | wc->reg_masks[idx] = mask; |
b6c9e612 | 774 | } |
ff55ea1f | 775 | |
db7f8281 BP |
776 | /* Returns the wildcard bitmask for the Ethernet destination address |
777 | * that 'wc' specifies. The bitmask has a 0 in each bit that is wildcarded | |
778 | * and a 1 in each bit that must match. */ | |
779 | const uint8_t * | |
780 | flow_wildcards_to_dl_dst_mask(flow_wildcards_t wc) | |
781 | { | |
782 | static const uint8_t no_wild[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; | |
783 | static const uint8_t addr_wild[] = {0x01, 0x00, 0x00, 0x00, 0x00, 0x00}; | |
784 | static const uint8_t mcast_wild[] = {0xfe, 0xff, 0xff, 0xff, 0xff, 0xff}; | |
785 | static const uint8_t all_wild[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; | |
786 | ||
787 | switch (wc & (FWW_DL_DST | FWW_ETH_MCAST)) { | |
788 | case 0: return no_wild; | |
789 | case FWW_DL_DST: return addr_wild; | |
790 | case FWW_ETH_MCAST: return mcast_wild; | |
791 | case FWW_DL_DST | FWW_ETH_MCAST: return all_wild; | |
792 | } | |
793 | NOT_REACHED(); | |
794 | } | |
795 | ||
796 | /* Returns true if 'mask' is a valid wildcard bitmask for the Ethernet | |
797 | * destination address. Valid bitmasks are either all-bits-0 or all-bits-1, | |
798 | * except that the multicast bit may differ from the rest of the bits. So, | |
799 | * there are four possible valid bitmasks: | |
800 | * | |
801 | * - 00:00:00:00:00:00 | |
802 | * - 01:00:00:00:00:00 | |
803 | * - fe:ff:ff:ff:ff:ff | |
804 | * - ff:ff:ff:ff:ff:ff | |
805 | * | |
806 | * All other bitmasks are invalid. */ | |
807 | bool | |
808 | flow_wildcards_is_dl_dst_mask_valid(const uint8_t mask[ETH_ADDR_LEN]) | |
809 | { | |
810 | switch (mask[0]) { | |
811 | case 0x00: | |
812 | case 0x01: | |
813 | return (mask[1] | mask[2] | mask[3] | mask[4] | mask[5]) == 0x00; | |
814 | ||
815 | case 0xfe: | |
816 | case 0xff: | |
817 | return (mask[1] & mask[2] & mask[3] & mask[4] & mask[5]) == 0xff; | |
818 | ||
819 | default: | |
820 | return false; | |
821 | } | |
822 | } | |
823 | ||
824 | /* Returns 'wc' with the FWW_DL_DST and FWW_ETH_MCAST bits modified | |
825 | * appropriately to match 'mask'. | |
826 | * | |
827 | * This function will assert-fail if 'mask' is invalid. Only 'mask' values | |
828 | * accepted by flow_wildcards_is_dl_dst_mask_valid() are allowed. */ | |
829 | flow_wildcards_t | |
830 | flow_wildcards_set_dl_dst_mask(flow_wildcards_t wc, | |
831 | const uint8_t mask[ETH_ADDR_LEN]) | |
832 | { | |
833 | assert(flow_wildcards_is_dl_dst_mask_valid(mask)); | |
834 | ||
835 | switch (mask[0]) { | |
836 | case 0x00: | |
837 | return wc | FWW_DL_DST | FWW_ETH_MCAST; | |
838 | ||
839 | case 0x01: | |
840 | return (wc | FWW_DL_DST) & ~FWW_ETH_MCAST; | |
841 | ||
842 | case 0xfe: | |
843 | return (wc & ~FWW_DL_DST) | FWW_ETH_MCAST; | |
844 | ||
845 | case 0xff: | |
846 | return wc & ~(FWW_DL_DST | FWW_ETH_MCAST); | |
847 | ||
848 | default: | |
849 | NOT_REACHED(); | |
850 | } | |
851 | } | |
852 | ||
ff55ea1f EJ |
853 | /* Hashes 'flow' based on its L2 through L4 protocol information. */ |
854 | uint32_t | |
855 | flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis) | |
856 | { | |
857 | struct { | |
d31f1109 JP |
858 | union { |
859 | ovs_be32 ipv4_addr; | |
860 | struct in6_addr ipv6_addr; | |
861 | }; | |
ff55ea1f EJ |
862 | ovs_be16 eth_type; |
863 | ovs_be16 vlan_tci; | |
864 | ovs_be16 tp_addr; | |
865 | uint8_t eth_addr[ETH_ADDR_LEN]; | |
866 | uint8_t ip_proto; | |
867 | } fields; | |
868 | ||
869 | int i; | |
870 | ||
871 | memset(&fields, 0, sizeof fields); | |
872 | for (i = 0; i < ETH_ADDR_LEN; i++) { | |
873 | fields.eth_addr[i] = flow->dl_src[i] ^ flow->dl_dst[i]; | |
874 | } | |
875 | fields.vlan_tci = flow->vlan_tci & htons(VLAN_VID_MASK); | |
876 | fields.eth_type = flow->dl_type; | |
3e3eda95 EJ |
877 | |
878 | /* UDP source and destination port are not taken into account because they | |
879 | * will not necessarily be symmetric in a bidirectional flow. */ | |
ff55ea1f | 880 | if (fields.eth_type == htons(ETH_TYPE_IP)) { |
d31f1109 JP |
881 | fields.ipv4_addr = flow->nw_src ^ flow->nw_dst; |
882 | fields.ip_proto = flow->nw_proto; | |
3e3eda95 | 883 | if (fields.ip_proto == IPPROTO_TCP) { |
d31f1109 JP |
884 | fields.tp_addr = flow->tp_src ^ flow->tp_dst; |
885 | } | |
886 | } else if (fields.eth_type == htons(ETH_TYPE_IPV6)) { | |
887 | const uint8_t *a = &flow->ipv6_src.s6_addr[0]; | |
888 | const uint8_t *b = &flow->ipv6_dst.s6_addr[0]; | |
889 | uint8_t *ipv6_addr = &fields.ipv6_addr.s6_addr[0]; | |
890 | ||
891 | for (i=0; i<16; i++) { | |
892 | ipv6_addr[i] = a[i] ^ b[i]; | |
893 | } | |
ff55ea1f | 894 | fields.ip_proto = flow->nw_proto; |
3e3eda95 | 895 | if (fields.ip_proto == IPPROTO_TCP) { |
ff55ea1f | 896 | fields.tp_addr = flow->tp_src ^ flow->tp_dst; |
ff55ea1f | 897 | } |
ff55ea1f EJ |
898 | } |
899 | return hash_bytes(&fields, sizeof fields, basis); | |
900 | } | |
520e9a2a EJ |
901 | |
902 | /* Hashes the portions of 'flow' designated by 'fields'. */ | |
903 | uint32_t | |
904 | flow_hash_fields(const struct flow *flow, enum nx_hash_fields fields, | |
905 | uint16_t basis) | |
906 | { | |
907 | switch (fields) { | |
908 | ||
909 | case NX_HASH_FIELDS_ETH_SRC: | |
910 | return hash_bytes(flow->dl_src, sizeof flow->dl_src, basis); | |
911 | ||
912 | case NX_HASH_FIELDS_SYMMETRIC_L4: | |
913 | return flow_hash_symmetric_l4(flow, basis); | |
914 | } | |
915 | ||
916 | NOT_REACHED(); | |
917 | } | |
918 | ||
919 | /* Returns a string representation of 'fields'. */ | |
920 | const char * | |
921 | flow_hash_fields_to_str(enum nx_hash_fields fields) | |
922 | { | |
923 | switch (fields) { | |
924 | case NX_HASH_FIELDS_ETH_SRC: return "eth_src"; | |
925 | case NX_HASH_FIELDS_SYMMETRIC_L4: return "symmetric_l4"; | |
926 | default: return "<unknown>"; | |
927 | } | |
928 | } | |
929 | ||
930 | /* Returns true if the value of 'fields' is supported. Otherwise false. */ | |
931 | bool | |
932 | flow_hash_fields_valid(enum nx_hash_fields fields) | |
933 | { | |
934 | return fields == NX_HASH_FIELDS_ETH_SRC | |
935 | || fields == NX_HASH_FIELDS_SYMMETRIC_L4; | |
936 | } | |
8b3b8dd1 BP |
937 | |
938 | /* Puts into 'b' a packet that flow_extract() would parse as having the given | |
939 | * 'flow'. | |
940 | * | |
941 | * (This is useful only for testing, obviously, and the packet isn't really | |
942 | * valid. It hasn't got any checksums filled in, for one, and lots of fields | |
943 | * are just zeroed.) */ | |
944 | void | |
945 | flow_compose(struct ofpbuf *b, const struct flow *flow) | |
946 | { | |
947 | eth_compose(b, flow->dl_dst, flow->dl_src, ntohs(flow->dl_type), 0); | |
948 | if (flow->dl_type == htons(FLOW_DL_TYPE_NONE)) { | |
949 | struct eth_header *eth = b->l2; | |
950 | eth->eth_type = htons(b->size); | |
951 | return; | |
952 | } | |
953 | ||
954 | if (flow->vlan_tci & htons(VLAN_CFI)) { | |
955 | eth_push_vlan(b, flow->vlan_tci & ~htons(VLAN_CFI)); | |
956 | } | |
957 | ||
958 | if (flow->dl_type == htons(ETH_TYPE_IP)) { | |
959 | struct ip_header *ip; | |
960 | ||
961 | b->l3 = ip = ofpbuf_put_zeros(b, sizeof *ip); | |
962 | ip->ip_ihl_ver = IP_IHL_VER(5, 4); | |
eadef313 | 963 | ip->ip_tos = flow->nw_tos; |
8b3b8dd1 BP |
964 | ip->ip_proto = flow->nw_proto; |
965 | ip->ip_src = flow->nw_src; | |
966 | ip->ip_dst = flow->nw_dst; | |
967 | ||
eadef313 | 968 | if (flow->nw_frag & FLOW_NW_FRAG_ANY) { |
7257b535 | 969 | ip->ip_frag_off |= htons(IP_MORE_FRAGMENTS); |
eadef313 | 970 | if (flow->nw_frag & FLOW_NW_FRAG_LATER) { |
7257b535 BP |
971 | ip->ip_frag_off |= htons(100); |
972 | } | |
973 | } | |
eadef313 JP |
974 | if (!(flow->nw_frag & FLOW_NW_FRAG_ANY) |
975 | || !(flow->nw_frag & FLOW_NW_FRAG_LATER)) { | |
7257b535 BP |
976 | if (flow->nw_proto == IPPROTO_TCP) { |
977 | struct tcp_header *tcp; | |
978 | ||
979 | b->l4 = tcp = ofpbuf_put_zeros(b, sizeof *tcp); | |
980 | tcp->tcp_src = flow->tp_src; | |
981 | tcp->tcp_dst = flow->tp_dst; | |
982 | } else if (flow->nw_proto == IPPROTO_UDP) { | |
983 | struct udp_header *udp; | |
984 | ||
985 | b->l4 = udp = ofpbuf_put_zeros(b, sizeof *udp); | |
986 | udp->udp_src = flow->tp_src; | |
987 | udp->udp_dst = flow->tp_dst; | |
988 | } else if (flow->nw_proto == IPPROTO_ICMP) { | |
989 | struct icmp_header *icmp; | |
990 | ||
991 | b->l4 = icmp = ofpbuf_put_zeros(b, sizeof *icmp); | |
992 | icmp->icmp_type = ntohs(flow->tp_src); | |
993 | icmp->icmp_code = ntohs(flow->tp_dst); | |
994 | } | |
8b3b8dd1 BP |
995 | } |
996 | } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) { | |
997 | /* XXX */ | |
998 | } else if (flow->dl_type == htons(ETH_TYPE_ARP)) { | |
999 | struct arp_eth_header *arp; | |
1000 | ||
1001 | b->l3 = arp = ofpbuf_put_zeros(b, sizeof *arp); | |
1002 | arp->ar_hrd = htons(1); | |
1003 | arp->ar_pro = htons(ETH_TYPE_IP); | |
1004 | arp->ar_hln = ETH_ADDR_LEN; | |
1005 | arp->ar_pln = 4; | |
1006 | arp->ar_op = htons(flow->nw_proto); | |
1007 | ||
1008 | if (flow->nw_proto == ARP_OP_REQUEST || | |
1009 | flow->nw_proto == ARP_OP_REPLY) { | |
1010 | arp->ar_spa = flow->nw_src; | |
1011 | arp->ar_tpa = flow->nw_dst; | |
1012 | memcpy(arp->ar_sha, flow->arp_sha, ETH_ADDR_LEN); | |
1013 | memcpy(arp->ar_tha, flow->arp_tha, ETH_ADDR_LEN); | |
1014 | } | |
1015 | } | |
1016 | } |