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ccb1352e | 1 | /* |
caf2ee14 | 2 | * Copyright (c) 2007-2011 Nicira, Inc. |
ccb1352e JG |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #include "flow.h" | |
20 | #include "datapath.h" | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/etherdevice.h> | |
24 | #include <linux/if_ether.h> | |
25 | #include <linux/if_vlan.h> | |
26 | #include <net/llc_pdu.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/jhash.h> | |
29 | #include <linux/jiffies.h> | |
30 | #include <linux/llc.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/in.h> | |
33 | #include <linux/rcupdate.h> | |
34 | #include <linux/if_arp.h> | |
ccb1352e JG |
35 | #include <linux/ip.h> |
36 | #include <linux/ipv6.h> | |
37 | #include <linux/tcp.h> | |
38 | #include <linux/udp.h> | |
39 | #include <linux/icmp.h> | |
40 | #include <linux/icmpv6.h> | |
41 | #include <linux/rculist.h> | |
42 | #include <net/ip.h> | |
43 | #include <net/ipv6.h> | |
44 | #include <net/ndisc.h> | |
45 | ||
46 | static struct kmem_cache *flow_cache; | |
47 | ||
48 | static int check_header(struct sk_buff *skb, int len) | |
49 | { | |
50 | if (unlikely(skb->len < len)) | |
51 | return -EINVAL; | |
52 | if (unlikely(!pskb_may_pull(skb, len))) | |
53 | return -ENOMEM; | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static bool arphdr_ok(struct sk_buff *skb) | |
58 | { | |
59 | return pskb_may_pull(skb, skb_network_offset(skb) + | |
60 | sizeof(struct arp_eth_header)); | |
61 | } | |
62 | ||
63 | static int check_iphdr(struct sk_buff *skb) | |
64 | { | |
65 | unsigned int nh_ofs = skb_network_offset(skb); | |
66 | unsigned int ip_len; | |
67 | int err; | |
68 | ||
69 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); | |
70 | if (unlikely(err)) | |
71 | return err; | |
72 | ||
73 | ip_len = ip_hdrlen(skb); | |
74 | if (unlikely(ip_len < sizeof(struct iphdr) || | |
75 | skb->len < nh_ofs + ip_len)) | |
76 | return -EINVAL; | |
77 | ||
78 | skb_set_transport_header(skb, nh_ofs + ip_len); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static bool tcphdr_ok(struct sk_buff *skb) | |
83 | { | |
84 | int th_ofs = skb_transport_offset(skb); | |
85 | int tcp_len; | |
86 | ||
87 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
88 | return false; | |
89 | ||
90 | tcp_len = tcp_hdrlen(skb); | |
91 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
92 | skb->len < th_ofs + tcp_len)) | |
93 | return false; | |
94 | ||
95 | return true; | |
96 | } | |
97 | ||
98 | static bool udphdr_ok(struct sk_buff *skb) | |
99 | { | |
100 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
101 | sizeof(struct udphdr)); | |
102 | } | |
103 | ||
104 | static bool icmphdr_ok(struct sk_buff *skb) | |
105 | { | |
106 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
107 | sizeof(struct icmphdr)); | |
108 | } | |
109 | ||
110 | u64 ovs_flow_used_time(unsigned long flow_jiffies) | |
111 | { | |
112 | struct timespec cur_ts; | |
113 | u64 cur_ms, idle_ms; | |
114 | ||
115 | ktime_get_ts(&cur_ts); | |
116 | idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); | |
117 | cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + | |
118 | cur_ts.tv_nsec / NSEC_PER_MSEC; | |
119 | ||
120 | return cur_ms - idle_ms; | |
121 | } | |
122 | ||
123 | #define SW_FLOW_KEY_OFFSET(field) \ | |
124 | (offsetof(struct sw_flow_key, field) + \ | |
125 | FIELD_SIZEOF(struct sw_flow_key, field)) | |
126 | ||
127 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key, | |
128 | int *key_lenp) | |
129 | { | |
130 | unsigned int nh_ofs = skb_network_offset(skb); | |
131 | unsigned int nh_len; | |
132 | int payload_ofs; | |
133 | struct ipv6hdr *nh; | |
134 | uint8_t nexthdr; | |
135 | __be16 frag_off; | |
136 | int err; | |
137 | ||
138 | *key_lenp = SW_FLOW_KEY_OFFSET(ipv6.label); | |
139 | ||
140 | err = check_header(skb, nh_ofs + sizeof(*nh)); | |
141 | if (unlikely(err)) | |
142 | return err; | |
143 | ||
144 | nh = ipv6_hdr(skb); | |
145 | nexthdr = nh->nexthdr; | |
146 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
147 | ||
148 | key->ip.proto = NEXTHDR_NONE; | |
149 | key->ip.tos = ipv6_get_dsfield(nh); | |
150 | key->ip.ttl = nh->hop_limit; | |
151 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
152 | key->ipv6.addr.src = nh->saddr; | |
153 | key->ipv6.addr.dst = nh->daddr; | |
154 | ||
155 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); | |
156 | if (unlikely(payload_ofs < 0)) | |
157 | return -EINVAL; | |
158 | ||
159 | if (frag_off) { | |
160 | if (frag_off & htons(~0x7)) | |
161 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
162 | else | |
163 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
164 | } | |
165 | ||
166 | nh_len = payload_ofs - nh_ofs; | |
167 | skb_set_transport_header(skb, nh_ofs + nh_len); | |
168 | key->ip.proto = nexthdr; | |
169 | return nh_len; | |
170 | } | |
171 | ||
172 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
173 | { | |
174 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
175 | sizeof(struct icmp6hdr)); | |
176 | } | |
177 | ||
178 | #define TCP_FLAGS_OFFSET 13 | |
179 | #define TCP_FLAG_MASK 0x3f | |
180 | ||
181 | void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb) | |
182 | { | |
183 | u8 tcp_flags = 0; | |
184 | ||
c55177e3 JG |
185 | if ((flow->key.eth.type == htons(ETH_P_IP) || |
186 | flow->key.eth.type == htons(ETH_P_IPV6)) && | |
bf32fecd JG |
187 | flow->key.ip.proto == IPPROTO_TCP && |
188 | likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) { | |
ccb1352e JG |
189 | u8 *tcp = (u8 *)tcp_hdr(skb); |
190 | tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK; | |
191 | } | |
192 | ||
193 | spin_lock(&flow->lock); | |
194 | flow->used = jiffies; | |
195 | flow->packet_count++; | |
196 | flow->byte_count += skb->len; | |
197 | flow->tcp_flags |= tcp_flags; | |
198 | spin_unlock(&flow->lock); | |
199 | } | |
200 | ||
201 | struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *actions) | |
202 | { | |
203 | int actions_len = nla_len(actions); | |
204 | struct sw_flow_actions *sfa; | |
205 | ||
15eac2a7 | 206 | if (actions_len > MAX_ACTIONS_BUFSIZE) |
ccb1352e JG |
207 | return ERR_PTR(-EINVAL); |
208 | ||
209 | sfa = kmalloc(sizeof(*sfa) + actions_len, GFP_KERNEL); | |
210 | if (!sfa) | |
211 | return ERR_PTR(-ENOMEM); | |
212 | ||
213 | sfa->actions_len = actions_len; | |
214 | memcpy(sfa->actions, nla_data(actions), actions_len); | |
215 | return sfa; | |
216 | } | |
217 | ||
218 | struct sw_flow *ovs_flow_alloc(void) | |
219 | { | |
220 | struct sw_flow *flow; | |
221 | ||
222 | flow = kmem_cache_alloc(flow_cache, GFP_KERNEL); | |
223 | if (!flow) | |
224 | return ERR_PTR(-ENOMEM); | |
225 | ||
226 | spin_lock_init(&flow->lock); | |
227 | flow->sf_acts = NULL; | |
228 | ||
229 | return flow; | |
230 | } | |
231 | ||
232 | static struct hlist_head *find_bucket(struct flow_table *table, u32 hash) | |
233 | { | |
234 | hash = jhash_1word(hash, table->hash_seed); | |
235 | return flex_array_get(table->buckets, | |
236 | (hash & (table->n_buckets - 1))); | |
237 | } | |
238 | ||
239 | static struct flex_array *alloc_buckets(unsigned int n_buckets) | |
240 | { | |
241 | struct flex_array *buckets; | |
242 | int i, err; | |
243 | ||
244 | buckets = flex_array_alloc(sizeof(struct hlist_head *), | |
245 | n_buckets, GFP_KERNEL); | |
246 | if (!buckets) | |
247 | return NULL; | |
248 | ||
249 | err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL); | |
250 | if (err) { | |
251 | flex_array_free(buckets); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | for (i = 0; i < n_buckets; i++) | |
256 | INIT_HLIST_HEAD((struct hlist_head *) | |
257 | flex_array_get(buckets, i)); | |
258 | ||
259 | return buckets; | |
260 | } | |
261 | ||
262 | static void free_buckets(struct flex_array *buckets) | |
263 | { | |
264 | flex_array_free(buckets); | |
265 | } | |
266 | ||
267 | struct flow_table *ovs_flow_tbl_alloc(int new_size) | |
268 | { | |
269 | struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL); | |
270 | ||
271 | if (!table) | |
272 | return NULL; | |
273 | ||
274 | table->buckets = alloc_buckets(new_size); | |
275 | ||
276 | if (!table->buckets) { | |
277 | kfree(table); | |
278 | return NULL; | |
279 | } | |
280 | table->n_buckets = new_size; | |
281 | table->count = 0; | |
282 | table->node_ver = 0; | |
283 | table->keep_flows = false; | |
284 | get_random_bytes(&table->hash_seed, sizeof(u32)); | |
285 | ||
286 | return table; | |
287 | } | |
288 | ||
289 | void ovs_flow_tbl_destroy(struct flow_table *table) | |
290 | { | |
291 | int i; | |
292 | ||
293 | if (!table) | |
294 | return; | |
295 | ||
296 | if (table->keep_flows) | |
297 | goto skip_flows; | |
298 | ||
299 | for (i = 0; i < table->n_buckets; i++) { | |
300 | struct sw_flow *flow; | |
301 | struct hlist_head *head = flex_array_get(table->buckets, i); | |
b67bfe0d | 302 | struct hlist_node *n; |
ccb1352e JG |
303 | int ver = table->node_ver; |
304 | ||
b67bfe0d | 305 | hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) { |
ccb1352e JG |
306 | hlist_del_rcu(&flow->hash_node[ver]); |
307 | ovs_flow_free(flow); | |
308 | } | |
309 | } | |
310 | ||
311 | skip_flows: | |
312 | free_buckets(table->buckets); | |
313 | kfree(table); | |
314 | } | |
315 | ||
316 | static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu) | |
317 | { | |
318 | struct flow_table *table = container_of(rcu, struct flow_table, rcu); | |
319 | ||
320 | ovs_flow_tbl_destroy(table); | |
321 | } | |
322 | ||
323 | void ovs_flow_tbl_deferred_destroy(struct flow_table *table) | |
324 | { | |
325 | if (!table) | |
326 | return; | |
327 | ||
328 | call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb); | |
329 | } | |
330 | ||
331 | struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *last) | |
332 | { | |
333 | struct sw_flow *flow; | |
334 | struct hlist_head *head; | |
ccb1352e JG |
335 | int ver; |
336 | int i; | |
337 | ||
338 | ver = table->node_ver; | |
339 | while (*bucket < table->n_buckets) { | |
340 | i = 0; | |
341 | head = flex_array_get(table->buckets, *bucket); | |
b67bfe0d | 342 | hlist_for_each_entry_rcu(flow, head, hash_node[ver]) { |
ccb1352e JG |
343 | if (i < *last) { |
344 | i++; | |
345 | continue; | |
346 | } | |
347 | *last = i + 1; | |
348 | return flow; | |
349 | } | |
350 | (*bucket)++; | |
351 | *last = 0; | |
352 | } | |
353 | ||
354 | return NULL; | |
355 | } | |
356 | ||
357 | static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new) | |
358 | { | |
359 | int old_ver; | |
360 | int i; | |
361 | ||
362 | old_ver = old->node_ver; | |
363 | new->node_ver = !old_ver; | |
364 | ||
365 | /* Insert in new table. */ | |
366 | for (i = 0; i < old->n_buckets; i++) { | |
367 | struct sw_flow *flow; | |
368 | struct hlist_head *head; | |
ccb1352e JG |
369 | |
370 | head = flex_array_get(old->buckets, i); | |
371 | ||
b67bfe0d | 372 | hlist_for_each_entry(flow, head, hash_node[old_ver]) |
ccb1352e JG |
373 | ovs_flow_tbl_insert(new, flow); |
374 | } | |
375 | old->keep_flows = true; | |
376 | } | |
377 | ||
378 | static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets) | |
379 | { | |
380 | struct flow_table *new_table; | |
381 | ||
382 | new_table = ovs_flow_tbl_alloc(n_buckets); | |
383 | if (!new_table) | |
384 | return ERR_PTR(-ENOMEM); | |
385 | ||
386 | flow_table_copy_flows(table, new_table); | |
387 | ||
388 | return new_table; | |
389 | } | |
390 | ||
391 | struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table) | |
392 | { | |
393 | return __flow_tbl_rehash(table, table->n_buckets); | |
394 | } | |
395 | ||
396 | struct flow_table *ovs_flow_tbl_expand(struct flow_table *table) | |
397 | { | |
398 | return __flow_tbl_rehash(table, table->n_buckets * 2); | |
399 | } | |
400 | ||
401 | void ovs_flow_free(struct sw_flow *flow) | |
402 | { | |
403 | if (unlikely(!flow)) | |
404 | return; | |
405 | ||
406 | kfree((struct sf_flow_acts __force *)flow->sf_acts); | |
407 | kmem_cache_free(flow_cache, flow); | |
408 | } | |
409 | ||
410 | /* RCU callback used by ovs_flow_deferred_free. */ | |
411 | static void rcu_free_flow_callback(struct rcu_head *rcu) | |
412 | { | |
413 | struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); | |
414 | ||
415 | ovs_flow_free(flow); | |
416 | } | |
417 | ||
418 | /* Schedules 'flow' to be freed after the next RCU grace period. | |
419 | * The caller must hold rcu_read_lock for this to be sensible. */ | |
420 | void ovs_flow_deferred_free(struct sw_flow *flow) | |
421 | { | |
422 | call_rcu(&flow->rcu, rcu_free_flow_callback); | |
423 | } | |
424 | ||
ccb1352e JG |
425 | /* Schedules 'sf_acts' to be freed after the next RCU grace period. |
426 | * The caller must hold rcu_read_lock for this to be sensible. */ | |
427 | void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts) | |
428 | { | |
80f0fd8a | 429 | kfree_rcu(sf_acts, rcu); |
ccb1352e JG |
430 | } |
431 | ||
432 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) | |
433 | { | |
434 | struct qtag_prefix { | |
435 | __be16 eth_type; /* ETH_P_8021Q */ | |
436 | __be16 tci; | |
437 | }; | |
438 | struct qtag_prefix *qp; | |
439 | ||
440 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) | |
441 | return 0; | |
442 | ||
443 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + | |
444 | sizeof(__be16)))) | |
445 | return -ENOMEM; | |
446 | ||
447 | qp = (struct qtag_prefix *) skb->data; | |
448 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); | |
449 | __skb_pull(skb, sizeof(struct qtag_prefix)); | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
454 | static __be16 parse_ethertype(struct sk_buff *skb) | |
455 | { | |
456 | struct llc_snap_hdr { | |
457 | u8 dsap; /* Always 0xAA */ | |
458 | u8 ssap; /* Always 0xAA */ | |
459 | u8 ctrl; | |
460 | u8 oui[3]; | |
461 | __be16 ethertype; | |
462 | }; | |
463 | struct llc_snap_hdr *llc; | |
464 | __be16 proto; | |
465 | ||
466 | proto = *(__be16 *) skb->data; | |
467 | __skb_pull(skb, sizeof(__be16)); | |
468 | ||
e5c5d22e | 469 | if (ntohs(proto) >= ETH_P_802_3_MIN) |
ccb1352e JG |
470 | return proto; |
471 | ||
472 | if (skb->len < sizeof(struct llc_snap_hdr)) | |
473 | return htons(ETH_P_802_2); | |
474 | ||
475 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) | |
476 | return htons(0); | |
477 | ||
478 | llc = (struct llc_snap_hdr *) skb->data; | |
479 | if (llc->dsap != LLC_SAP_SNAP || | |
480 | llc->ssap != LLC_SAP_SNAP || | |
481 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
482 | return htons(ETH_P_802_2); | |
483 | ||
484 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
17b682a0 | 485 | |
e5c5d22e | 486 | if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN) |
17b682a0 RL |
487 | return llc->ethertype; |
488 | ||
489 | return htons(ETH_P_802_2); | |
ccb1352e JG |
490 | } |
491 | ||
492 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, | |
493 | int *key_lenp, int nh_len) | |
494 | { | |
495 | struct icmp6hdr *icmp = icmp6_hdr(skb); | |
496 | int error = 0; | |
497 | int key_len; | |
498 | ||
499 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
500 | * fields, so we need to store them in 16-bit network byte order. | |
501 | */ | |
502 | key->ipv6.tp.src = htons(icmp->icmp6_type); | |
503 | key->ipv6.tp.dst = htons(icmp->icmp6_code); | |
504 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
505 | ||
506 | if (icmp->icmp6_code == 0 && | |
507 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
508 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
509 | int icmp_len = skb->len - skb_transport_offset(skb); | |
510 | struct nd_msg *nd; | |
511 | int offset; | |
512 | ||
513 | key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); | |
514 | ||
515 | /* In order to process neighbor discovery options, we need the | |
516 | * entire packet. | |
517 | */ | |
518 | if (unlikely(icmp_len < sizeof(*nd))) | |
519 | goto out; | |
520 | if (unlikely(skb_linearize(skb))) { | |
521 | error = -ENOMEM; | |
522 | goto out; | |
523 | } | |
524 | ||
525 | nd = (struct nd_msg *)skb_transport_header(skb); | |
526 | key->ipv6.nd.target = nd->target; | |
527 | key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); | |
528 | ||
529 | icmp_len -= sizeof(*nd); | |
530 | offset = 0; | |
531 | while (icmp_len >= 8) { | |
532 | struct nd_opt_hdr *nd_opt = | |
533 | (struct nd_opt_hdr *)(nd->opt + offset); | |
534 | int opt_len = nd_opt->nd_opt_len * 8; | |
535 | ||
536 | if (unlikely(!opt_len || opt_len > icmp_len)) | |
537 | goto invalid; | |
538 | ||
539 | /* Store the link layer address if the appropriate | |
540 | * option is provided. It is considered an error if | |
541 | * the same link layer option is specified twice. | |
542 | */ | |
543 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR | |
544 | && opt_len == 8) { | |
545 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) | |
546 | goto invalid; | |
547 | memcpy(key->ipv6.nd.sll, | |
548 | &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN); | |
549 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR | |
550 | && opt_len == 8) { | |
551 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) | |
552 | goto invalid; | |
553 | memcpy(key->ipv6.nd.tll, | |
554 | &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN); | |
555 | } | |
556 | ||
557 | icmp_len -= opt_len; | |
558 | offset += opt_len; | |
559 | } | |
560 | } | |
561 | ||
562 | goto out; | |
563 | ||
564 | invalid: | |
565 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); | |
566 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
567 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
568 | ||
569 | out: | |
570 | *key_lenp = key_len; | |
571 | return error; | |
572 | } | |
573 | ||
574 | /** | |
575 | * ovs_flow_extract - extracts a flow key from an Ethernet frame. | |
576 | * @skb: sk_buff that contains the frame, with skb->data pointing to the | |
577 | * Ethernet header | |
578 | * @in_port: port number on which @skb was received. | |
579 | * @key: output flow key | |
580 | * @key_lenp: length of output flow key | |
581 | * | |
582 | * The caller must ensure that skb->len >= ETH_HLEN. | |
583 | * | |
584 | * Returns 0 if successful, otherwise a negative errno value. | |
585 | * | |
586 | * Initializes @skb header pointers as follows: | |
587 | * | |
588 | * - skb->mac_header: the Ethernet header. | |
589 | * | |
590 | * - skb->network_header: just past the Ethernet header, or just past the | |
591 | * VLAN header, to the first byte of the Ethernet payload. | |
592 | * | |
593 | * - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6 | |
594 | * on output, then just past the IP header, if one is present and | |
595 | * of a correct length, otherwise the same as skb->network_header. | |
596 | * For other key->dl_type values it is left untouched. | |
597 | */ | |
598 | int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key, | |
599 | int *key_lenp) | |
600 | { | |
601 | int error = 0; | |
602 | int key_len = SW_FLOW_KEY_OFFSET(eth); | |
603 | struct ethhdr *eth; | |
604 | ||
605 | memset(key, 0, sizeof(*key)); | |
606 | ||
607 | key->phy.priority = skb->priority; | |
608 | key->phy.in_port = in_port; | |
39c7caeb | 609 | key->phy.skb_mark = skb->mark; |
ccb1352e JG |
610 | |
611 | skb_reset_mac_header(skb); | |
612 | ||
613 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet | |
614 | * header in the linear data area. | |
615 | */ | |
616 | eth = eth_hdr(skb); | |
617 | memcpy(key->eth.src, eth->h_source, ETH_ALEN); | |
618 | memcpy(key->eth.dst, eth->h_dest, ETH_ALEN); | |
619 | ||
620 | __skb_pull(skb, 2 * ETH_ALEN); | |
621 | ||
622 | if (vlan_tx_tag_present(skb)) | |
623 | key->eth.tci = htons(skb->vlan_tci); | |
624 | else if (eth->h_proto == htons(ETH_P_8021Q)) | |
625 | if (unlikely(parse_vlan(skb, key))) | |
626 | return -ENOMEM; | |
627 | ||
628 | key->eth.type = parse_ethertype(skb); | |
629 | if (unlikely(key->eth.type == htons(0))) | |
630 | return -ENOMEM; | |
631 | ||
632 | skb_reset_network_header(skb); | |
633 | __skb_push(skb, skb->data - skb_mac_header(skb)); | |
634 | ||
635 | /* Network layer. */ | |
636 | if (key->eth.type == htons(ETH_P_IP)) { | |
637 | struct iphdr *nh; | |
638 | __be16 offset; | |
639 | ||
640 | key_len = SW_FLOW_KEY_OFFSET(ipv4.addr); | |
641 | ||
642 | error = check_iphdr(skb); | |
643 | if (unlikely(error)) { | |
644 | if (error == -EINVAL) { | |
645 | skb->transport_header = skb->network_header; | |
646 | error = 0; | |
647 | } | |
648 | goto out; | |
649 | } | |
650 | ||
651 | nh = ip_hdr(skb); | |
652 | key->ipv4.addr.src = nh->saddr; | |
653 | key->ipv4.addr.dst = nh->daddr; | |
654 | ||
655 | key->ip.proto = nh->protocol; | |
656 | key->ip.tos = nh->tos; | |
657 | key->ip.ttl = nh->ttl; | |
658 | ||
659 | offset = nh->frag_off & htons(IP_OFFSET); | |
660 | if (offset) { | |
661 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
662 | goto out; | |
663 | } | |
664 | if (nh->frag_off & htons(IP_MF) || | |
665 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
666 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
667 | ||
668 | /* Transport layer. */ | |
669 | if (key->ip.proto == IPPROTO_TCP) { | |
670 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
671 | if (tcphdr_ok(skb)) { | |
672 | struct tcphdr *tcp = tcp_hdr(skb); | |
673 | key->ipv4.tp.src = tcp->source; | |
674 | key->ipv4.tp.dst = tcp->dest; | |
675 | } | |
676 | } else if (key->ip.proto == IPPROTO_UDP) { | |
677 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
678 | if (udphdr_ok(skb)) { | |
679 | struct udphdr *udp = udp_hdr(skb); | |
680 | key->ipv4.tp.src = udp->source; | |
681 | key->ipv4.tp.dst = udp->dest; | |
682 | } | |
683 | } else if (key->ip.proto == IPPROTO_ICMP) { | |
684 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
685 | if (icmphdr_ok(skb)) { | |
686 | struct icmphdr *icmp = icmp_hdr(skb); | |
687 | /* The ICMP type and code fields use the 16-bit | |
688 | * transport port fields, so we need to store | |
689 | * them in 16-bit network byte order. */ | |
690 | key->ipv4.tp.src = htons(icmp->type); | |
691 | key->ipv4.tp.dst = htons(icmp->code); | |
692 | } | |
693 | } | |
694 | ||
c0618533 MM |
695 | } else if ((key->eth.type == htons(ETH_P_ARP) || |
696 | key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) { | |
ccb1352e JG |
697 | struct arp_eth_header *arp; |
698 | ||
699 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
700 | ||
701 | if (arp->ar_hrd == htons(ARPHRD_ETHER) | |
702 | && arp->ar_pro == htons(ETH_P_IP) | |
703 | && arp->ar_hln == ETH_ALEN | |
704 | && arp->ar_pln == 4) { | |
705 | ||
706 | /* We only match on the lower 8 bits of the opcode. */ | |
707 | if (ntohs(arp->ar_op) <= 0xff) | |
708 | key->ip.proto = ntohs(arp->ar_op); | |
d04d3829 MM |
709 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
710 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
711 | memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN); | |
712 | memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN); | |
713 | key_len = SW_FLOW_KEY_OFFSET(ipv4.arp); | |
ccb1352e JG |
714 | } |
715 | } else if (key->eth.type == htons(ETH_P_IPV6)) { | |
716 | int nh_len; /* IPv6 Header + Extensions */ | |
717 | ||
718 | nh_len = parse_ipv6hdr(skb, key, &key_len); | |
719 | if (unlikely(nh_len < 0)) { | |
720 | if (nh_len == -EINVAL) | |
721 | skb->transport_header = skb->network_header; | |
722 | else | |
723 | error = nh_len; | |
724 | goto out; | |
725 | } | |
726 | ||
727 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) | |
728 | goto out; | |
729 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
730 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
731 | ||
732 | /* Transport layer. */ | |
733 | if (key->ip.proto == NEXTHDR_TCP) { | |
734 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
735 | if (tcphdr_ok(skb)) { | |
736 | struct tcphdr *tcp = tcp_hdr(skb); | |
737 | key->ipv6.tp.src = tcp->source; | |
738 | key->ipv6.tp.dst = tcp->dest; | |
739 | } | |
740 | } else if (key->ip.proto == NEXTHDR_UDP) { | |
741 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
742 | if (udphdr_ok(skb)) { | |
743 | struct udphdr *udp = udp_hdr(skb); | |
744 | key->ipv6.tp.src = udp->source; | |
745 | key->ipv6.tp.dst = udp->dest; | |
746 | } | |
747 | } else if (key->ip.proto == NEXTHDR_ICMP) { | |
748 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
749 | if (icmp6hdr_ok(skb)) { | |
750 | error = parse_icmpv6(skb, key, &key_len, nh_len); | |
751 | if (error < 0) | |
752 | goto out; | |
753 | } | |
754 | } | |
755 | } | |
756 | ||
757 | out: | |
758 | *key_lenp = key_len; | |
759 | return error; | |
760 | } | |
761 | ||
762 | u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len) | |
763 | { | |
764 | return jhash2((u32 *)key, DIV_ROUND_UP(key_len, sizeof(u32)), 0); | |
765 | } | |
766 | ||
767 | struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table, | |
768 | struct sw_flow_key *key, int key_len) | |
769 | { | |
770 | struct sw_flow *flow; | |
ccb1352e JG |
771 | struct hlist_head *head; |
772 | u32 hash; | |
773 | ||
774 | hash = ovs_flow_hash(key, key_len); | |
775 | ||
776 | head = find_bucket(table, hash); | |
b67bfe0d | 777 | hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) { |
ccb1352e JG |
778 | |
779 | if (flow->hash == hash && | |
780 | !memcmp(&flow->key, key, key_len)) { | |
781 | return flow; | |
782 | } | |
783 | } | |
784 | return NULL; | |
785 | } | |
786 | ||
787 | void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow) | |
788 | { | |
789 | struct hlist_head *head; | |
790 | ||
791 | head = find_bucket(table, flow->hash); | |
792 | hlist_add_head_rcu(&flow->hash_node[table->node_ver], head); | |
793 | table->count++; | |
794 | } | |
795 | ||
796 | void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow) | |
797 | { | |
798 | hlist_del_rcu(&flow->hash_node[table->node_ver]); | |
799 | table->count--; | |
800 | BUG_ON(table->count < 0); | |
801 | } | |
802 | ||
803 | /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */ | |
804 | const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = { | |
805 | [OVS_KEY_ATTR_ENCAP] = -1, | |
806 | [OVS_KEY_ATTR_PRIORITY] = sizeof(u32), | |
807 | [OVS_KEY_ATTR_IN_PORT] = sizeof(u32), | |
39c7caeb | 808 | [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32), |
ccb1352e JG |
809 | [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet), |
810 | [OVS_KEY_ATTR_VLAN] = sizeof(__be16), | |
811 | [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16), | |
812 | [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4), | |
813 | [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6), | |
814 | [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp), | |
815 | [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp), | |
816 | [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp), | |
817 | [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6), | |
818 | [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp), | |
819 | [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd), | |
820 | }; | |
821 | ||
822 | static int ipv4_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len, | |
823 | const struct nlattr *a[], u32 *attrs) | |
824 | { | |
825 | const struct ovs_key_icmp *icmp_key; | |
826 | const struct ovs_key_tcp *tcp_key; | |
827 | const struct ovs_key_udp *udp_key; | |
828 | ||
829 | switch (swkey->ip.proto) { | |
830 | case IPPROTO_TCP: | |
831 | if (!(*attrs & (1 << OVS_KEY_ATTR_TCP))) | |
832 | return -EINVAL; | |
833 | *attrs &= ~(1 << OVS_KEY_ATTR_TCP); | |
834 | ||
835 | *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
836 | tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); | |
837 | swkey->ipv4.tp.src = tcp_key->tcp_src; | |
838 | swkey->ipv4.tp.dst = tcp_key->tcp_dst; | |
839 | break; | |
840 | ||
841 | case IPPROTO_UDP: | |
842 | if (!(*attrs & (1 << OVS_KEY_ATTR_UDP))) | |
843 | return -EINVAL; | |
844 | *attrs &= ~(1 << OVS_KEY_ATTR_UDP); | |
845 | ||
846 | *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
847 | udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); | |
848 | swkey->ipv4.tp.src = udp_key->udp_src; | |
849 | swkey->ipv4.tp.dst = udp_key->udp_dst; | |
850 | break; | |
851 | ||
852 | case IPPROTO_ICMP: | |
853 | if (!(*attrs & (1 << OVS_KEY_ATTR_ICMP))) | |
854 | return -EINVAL; | |
855 | *attrs &= ~(1 << OVS_KEY_ATTR_ICMP); | |
856 | ||
857 | *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
858 | icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]); | |
859 | swkey->ipv4.tp.src = htons(icmp_key->icmp_type); | |
860 | swkey->ipv4.tp.dst = htons(icmp_key->icmp_code); | |
861 | break; | |
862 | } | |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | static int ipv6_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len, | |
868 | const struct nlattr *a[], u32 *attrs) | |
869 | { | |
870 | const struct ovs_key_icmpv6 *icmpv6_key; | |
871 | const struct ovs_key_tcp *tcp_key; | |
872 | const struct ovs_key_udp *udp_key; | |
873 | ||
874 | switch (swkey->ip.proto) { | |
875 | case IPPROTO_TCP: | |
876 | if (!(*attrs & (1 << OVS_KEY_ATTR_TCP))) | |
877 | return -EINVAL; | |
878 | *attrs &= ~(1 << OVS_KEY_ATTR_TCP); | |
879 | ||
880 | *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
881 | tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); | |
882 | swkey->ipv6.tp.src = tcp_key->tcp_src; | |
883 | swkey->ipv6.tp.dst = tcp_key->tcp_dst; | |
884 | break; | |
885 | ||
886 | case IPPROTO_UDP: | |
887 | if (!(*attrs & (1 << OVS_KEY_ATTR_UDP))) | |
888 | return -EINVAL; | |
889 | *attrs &= ~(1 << OVS_KEY_ATTR_UDP); | |
890 | ||
891 | *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
892 | udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); | |
893 | swkey->ipv6.tp.src = udp_key->udp_src; | |
894 | swkey->ipv6.tp.dst = udp_key->udp_dst; | |
895 | break; | |
896 | ||
897 | case IPPROTO_ICMPV6: | |
898 | if (!(*attrs & (1 << OVS_KEY_ATTR_ICMPV6))) | |
899 | return -EINVAL; | |
900 | *attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6); | |
901 | ||
902 | *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
903 | icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]); | |
904 | swkey->ipv6.tp.src = htons(icmpv6_key->icmpv6_type); | |
905 | swkey->ipv6.tp.dst = htons(icmpv6_key->icmpv6_code); | |
906 | ||
907 | if (swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) || | |
908 | swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
909 | const struct ovs_key_nd *nd_key; | |
910 | ||
911 | if (!(*attrs & (1 << OVS_KEY_ATTR_ND))) | |
912 | return -EINVAL; | |
913 | *attrs &= ~(1 << OVS_KEY_ATTR_ND); | |
914 | ||
915 | *key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); | |
916 | nd_key = nla_data(a[OVS_KEY_ATTR_ND]); | |
917 | memcpy(&swkey->ipv6.nd.target, nd_key->nd_target, | |
918 | sizeof(swkey->ipv6.nd.target)); | |
919 | memcpy(swkey->ipv6.nd.sll, nd_key->nd_sll, ETH_ALEN); | |
920 | memcpy(swkey->ipv6.nd.tll, nd_key->nd_tll, ETH_ALEN); | |
921 | } | |
922 | break; | |
923 | } | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | static int parse_flow_nlattrs(const struct nlattr *attr, | |
929 | const struct nlattr *a[], u32 *attrsp) | |
930 | { | |
931 | const struct nlattr *nla; | |
932 | u32 attrs; | |
933 | int rem; | |
934 | ||
935 | attrs = 0; | |
936 | nla_for_each_nested(nla, attr, rem) { | |
937 | u16 type = nla_type(nla); | |
938 | int expected_len; | |
939 | ||
940 | if (type > OVS_KEY_ATTR_MAX || attrs & (1 << type)) | |
941 | return -EINVAL; | |
942 | ||
943 | expected_len = ovs_key_lens[type]; | |
944 | if (nla_len(nla) != expected_len && expected_len != -1) | |
945 | return -EINVAL; | |
946 | ||
947 | attrs |= 1 << type; | |
948 | a[type] = nla; | |
949 | } | |
950 | if (rem) | |
951 | return -EINVAL; | |
952 | ||
953 | *attrsp = attrs; | |
954 | return 0; | |
955 | } | |
956 | ||
957 | /** | |
958 | * ovs_flow_from_nlattrs - parses Netlink attributes into a flow key. | |
959 | * @swkey: receives the extracted flow key. | |
960 | * @key_lenp: number of bytes used in @swkey. | |
961 | * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute | |
962 | * sequence. | |
963 | */ | |
964 | int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, | |
965 | const struct nlattr *attr) | |
966 | { | |
967 | const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; | |
968 | const struct ovs_key_ethernet *eth_key; | |
969 | int key_len; | |
970 | u32 attrs; | |
971 | int err; | |
972 | ||
973 | memset(swkey, 0, sizeof(struct sw_flow_key)); | |
974 | key_len = SW_FLOW_KEY_OFFSET(eth); | |
975 | ||
976 | err = parse_flow_nlattrs(attr, a, &attrs); | |
977 | if (err) | |
978 | return err; | |
979 | ||
980 | /* Metadata attributes. */ | |
981 | if (attrs & (1 << OVS_KEY_ATTR_PRIORITY)) { | |
982 | swkey->phy.priority = nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]); | |
983 | attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY); | |
984 | } | |
985 | if (attrs & (1 << OVS_KEY_ATTR_IN_PORT)) { | |
986 | u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]); | |
987 | if (in_port >= DP_MAX_PORTS) | |
988 | return -EINVAL; | |
989 | swkey->phy.in_port = in_port; | |
990 | attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT); | |
991 | } else { | |
15eac2a7 | 992 | swkey->phy.in_port = DP_MAX_PORTS; |
ccb1352e | 993 | } |
39c7caeb AA |
994 | if (attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) { |
995 | swkey->phy.skb_mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]); | |
996 | attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK); | |
997 | } | |
ccb1352e JG |
998 | |
999 | /* Data attributes. */ | |
1000 | if (!(attrs & (1 << OVS_KEY_ATTR_ETHERNET))) | |
1001 | return -EINVAL; | |
1002 | attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET); | |
1003 | ||
1004 | eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]); | |
1005 | memcpy(swkey->eth.src, eth_key->eth_src, ETH_ALEN); | |
1006 | memcpy(swkey->eth.dst, eth_key->eth_dst, ETH_ALEN); | |
1007 | ||
1008 | if (attrs & (1u << OVS_KEY_ATTR_ETHERTYPE) && | |
1009 | nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q)) { | |
1010 | const struct nlattr *encap; | |
1011 | __be16 tci; | |
1012 | ||
1013 | if (attrs != ((1 << OVS_KEY_ATTR_VLAN) | | |
1014 | (1 << OVS_KEY_ATTR_ETHERTYPE) | | |
1015 | (1 << OVS_KEY_ATTR_ENCAP))) | |
1016 | return -EINVAL; | |
1017 | ||
1018 | encap = a[OVS_KEY_ATTR_ENCAP]; | |
1019 | tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); | |
1020 | if (tci & htons(VLAN_TAG_PRESENT)) { | |
1021 | swkey->eth.tci = tci; | |
1022 | ||
1023 | err = parse_flow_nlattrs(encap, a, &attrs); | |
1024 | if (err) | |
1025 | return err; | |
1026 | } else if (!tci) { | |
1027 | /* Corner case for truncated 802.1Q header. */ | |
1028 | if (nla_len(encap)) | |
1029 | return -EINVAL; | |
1030 | ||
1031 | swkey->eth.type = htons(ETH_P_8021Q); | |
1032 | *key_lenp = key_len; | |
1033 | return 0; | |
1034 | } else { | |
1035 | return -EINVAL; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) { | |
1040 | swkey->eth.type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); | |
e5c5d22e | 1041 | if (ntohs(swkey->eth.type) < ETH_P_802_3_MIN) |
ccb1352e JG |
1042 | return -EINVAL; |
1043 | attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); | |
1044 | } else { | |
1045 | swkey->eth.type = htons(ETH_P_802_2); | |
1046 | } | |
1047 | ||
1048 | if (swkey->eth.type == htons(ETH_P_IP)) { | |
1049 | const struct ovs_key_ipv4 *ipv4_key; | |
1050 | ||
1051 | if (!(attrs & (1 << OVS_KEY_ATTR_IPV4))) | |
1052 | return -EINVAL; | |
1053 | attrs &= ~(1 << OVS_KEY_ATTR_IPV4); | |
1054 | ||
1055 | key_len = SW_FLOW_KEY_OFFSET(ipv4.addr); | |
1056 | ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]); | |
1057 | if (ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) | |
1058 | return -EINVAL; | |
1059 | swkey->ip.proto = ipv4_key->ipv4_proto; | |
1060 | swkey->ip.tos = ipv4_key->ipv4_tos; | |
1061 | swkey->ip.ttl = ipv4_key->ipv4_ttl; | |
1062 | swkey->ip.frag = ipv4_key->ipv4_frag; | |
1063 | swkey->ipv4.addr.src = ipv4_key->ipv4_src; | |
1064 | swkey->ipv4.addr.dst = ipv4_key->ipv4_dst; | |
1065 | ||
1066 | if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) { | |
1067 | err = ipv4_flow_from_nlattrs(swkey, &key_len, a, &attrs); | |
1068 | if (err) | |
1069 | return err; | |
1070 | } | |
1071 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1072 | const struct ovs_key_ipv6 *ipv6_key; | |
1073 | ||
1074 | if (!(attrs & (1 << OVS_KEY_ATTR_IPV6))) | |
1075 | return -EINVAL; | |
1076 | attrs &= ~(1 << OVS_KEY_ATTR_IPV6); | |
1077 | ||
1078 | key_len = SW_FLOW_KEY_OFFSET(ipv6.label); | |
1079 | ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]); | |
1080 | if (ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) | |
1081 | return -EINVAL; | |
1082 | swkey->ipv6.label = ipv6_key->ipv6_label; | |
1083 | swkey->ip.proto = ipv6_key->ipv6_proto; | |
1084 | swkey->ip.tos = ipv6_key->ipv6_tclass; | |
1085 | swkey->ip.ttl = ipv6_key->ipv6_hlimit; | |
1086 | swkey->ip.frag = ipv6_key->ipv6_frag; | |
1087 | memcpy(&swkey->ipv6.addr.src, ipv6_key->ipv6_src, | |
1088 | sizeof(swkey->ipv6.addr.src)); | |
1089 | memcpy(&swkey->ipv6.addr.dst, ipv6_key->ipv6_dst, | |
1090 | sizeof(swkey->ipv6.addr.dst)); | |
1091 | ||
1092 | if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) { | |
1093 | err = ipv6_flow_from_nlattrs(swkey, &key_len, a, &attrs); | |
1094 | if (err) | |
1095 | return err; | |
1096 | } | |
c0618533 MM |
1097 | } else if (swkey->eth.type == htons(ETH_P_ARP) || |
1098 | swkey->eth.type == htons(ETH_P_RARP)) { | |
ccb1352e JG |
1099 | const struct ovs_key_arp *arp_key; |
1100 | ||
1101 | if (!(attrs & (1 << OVS_KEY_ATTR_ARP))) | |
1102 | return -EINVAL; | |
1103 | attrs &= ~(1 << OVS_KEY_ATTR_ARP); | |
1104 | ||
1105 | key_len = SW_FLOW_KEY_OFFSET(ipv4.arp); | |
1106 | arp_key = nla_data(a[OVS_KEY_ATTR_ARP]); | |
1107 | swkey->ipv4.addr.src = arp_key->arp_sip; | |
1108 | swkey->ipv4.addr.dst = arp_key->arp_tip; | |
1109 | if (arp_key->arp_op & htons(0xff00)) | |
1110 | return -EINVAL; | |
1111 | swkey->ip.proto = ntohs(arp_key->arp_op); | |
1112 | memcpy(swkey->ipv4.arp.sha, arp_key->arp_sha, ETH_ALEN); | |
1113 | memcpy(swkey->ipv4.arp.tha, arp_key->arp_tha, ETH_ALEN); | |
1114 | } | |
1115 | ||
1116 | if (attrs) | |
1117 | return -EINVAL; | |
1118 | *key_lenp = key_len; | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | /** | |
1124 | * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key. | |
39c7caeb AA |
1125 | * @priority: receives the skb priority |
1126 | * @mark: receives the skb mark | |
ccb1352e JG |
1127 | * @in_port: receives the extracted input port. |
1128 | * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute | |
1129 | * sequence. | |
1130 | * | |
1131 | * This parses a series of Netlink attributes that form a flow key, which must | |
1132 | * take the same form accepted by flow_from_nlattrs(), but only enough of it to | |
1133 | * get the metadata, that is, the parts of the flow key that cannot be | |
1134 | * extracted from the packet itself. | |
1135 | */ | |
39c7caeb | 1136 | int ovs_flow_metadata_from_nlattrs(u32 *priority, u32 *mark, u16 *in_port, |
ccb1352e JG |
1137 | const struct nlattr *attr) |
1138 | { | |
1139 | const struct nlattr *nla; | |
1140 | int rem; | |
1141 | ||
15eac2a7 | 1142 | *in_port = DP_MAX_PORTS; |
ccb1352e | 1143 | *priority = 0; |
39c7caeb | 1144 | *mark = 0; |
ccb1352e JG |
1145 | |
1146 | nla_for_each_nested(nla, attr, rem) { | |
1147 | int type = nla_type(nla); | |
1148 | ||
1149 | if (type <= OVS_KEY_ATTR_MAX && ovs_key_lens[type] > 0) { | |
1150 | if (nla_len(nla) != ovs_key_lens[type]) | |
1151 | return -EINVAL; | |
1152 | ||
1153 | switch (type) { | |
1154 | case OVS_KEY_ATTR_PRIORITY: | |
1155 | *priority = nla_get_u32(nla); | |
1156 | break; | |
1157 | ||
1158 | case OVS_KEY_ATTR_IN_PORT: | |
1159 | if (nla_get_u32(nla) >= DP_MAX_PORTS) | |
1160 | return -EINVAL; | |
1161 | *in_port = nla_get_u32(nla); | |
1162 | break; | |
39c7caeb AA |
1163 | |
1164 | case OVS_KEY_ATTR_SKB_MARK: | |
1165 | *mark = nla_get_u32(nla); | |
1166 | break; | |
ccb1352e JG |
1167 | } |
1168 | } | |
1169 | } | |
1170 | if (rem) | |
1171 | return -EINVAL; | |
1172 | return 0; | |
1173 | } | |
1174 | ||
1175 | int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) | |
1176 | { | |
1177 | struct ovs_key_ethernet *eth_key; | |
1178 | struct nlattr *nla, *encap; | |
1179 | ||
028d6a67 DM |
1180 | if (swkey->phy.priority && |
1181 | nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, swkey->phy.priority)) | |
1182 | goto nla_put_failure; | |
ccb1352e | 1183 | |
15eac2a7 | 1184 | if (swkey->phy.in_port != DP_MAX_PORTS && |
028d6a67 DM |
1185 | nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, swkey->phy.in_port)) |
1186 | goto nla_put_failure; | |
ccb1352e | 1187 | |
39c7caeb AA |
1188 | if (swkey->phy.skb_mark && |
1189 | nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, swkey->phy.skb_mark)) | |
1190 | goto nla_put_failure; | |
1191 | ||
ccb1352e JG |
1192 | nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key)); |
1193 | if (!nla) | |
1194 | goto nla_put_failure; | |
1195 | eth_key = nla_data(nla); | |
1196 | memcpy(eth_key->eth_src, swkey->eth.src, ETH_ALEN); | |
1197 | memcpy(eth_key->eth_dst, swkey->eth.dst, ETH_ALEN); | |
1198 | ||
1199 | if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) { | |
028d6a67 DM |
1200 | if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, htons(ETH_P_8021Q)) || |
1201 | nla_put_be16(skb, OVS_KEY_ATTR_VLAN, swkey->eth.tci)) | |
1202 | goto nla_put_failure; | |
ccb1352e JG |
1203 | encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP); |
1204 | if (!swkey->eth.tci) | |
1205 | goto unencap; | |
1206 | } else { | |
1207 | encap = NULL; | |
1208 | } | |
1209 | ||
1210 | if (swkey->eth.type == htons(ETH_P_802_2)) | |
1211 | goto unencap; | |
1212 | ||
028d6a67 DM |
1213 | if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, swkey->eth.type)) |
1214 | goto nla_put_failure; | |
ccb1352e JG |
1215 | |
1216 | if (swkey->eth.type == htons(ETH_P_IP)) { | |
1217 | struct ovs_key_ipv4 *ipv4_key; | |
1218 | ||
1219 | nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key)); | |
1220 | if (!nla) | |
1221 | goto nla_put_failure; | |
1222 | ipv4_key = nla_data(nla); | |
1223 | ipv4_key->ipv4_src = swkey->ipv4.addr.src; | |
1224 | ipv4_key->ipv4_dst = swkey->ipv4.addr.dst; | |
1225 | ipv4_key->ipv4_proto = swkey->ip.proto; | |
1226 | ipv4_key->ipv4_tos = swkey->ip.tos; | |
1227 | ipv4_key->ipv4_ttl = swkey->ip.ttl; | |
1228 | ipv4_key->ipv4_frag = swkey->ip.frag; | |
1229 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1230 | struct ovs_key_ipv6 *ipv6_key; | |
1231 | ||
1232 | nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key)); | |
1233 | if (!nla) | |
1234 | goto nla_put_failure; | |
1235 | ipv6_key = nla_data(nla); | |
1236 | memcpy(ipv6_key->ipv6_src, &swkey->ipv6.addr.src, | |
1237 | sizeof(ipv6_key->ipv6_src)); | |
1238 | memcpy(ipv6_key->ipv6_dst, &swkey->ipv6.addr.dst, | |
1239 | sizeof(ipv6_key->ipv6_dst)); | |
1240 | ipv6_key->ipv6_label = swkey->ipv6.label; | |
1241 | ipv6_key->ipv6_proto = swkey->ip.proto; | |
1242 | ipv6_key->ipv6_tclass = swkey->ip.tos; | |
1243 | ipv6_key->ipv6_hlimit = swkey->ip.ttl; | |
1244 | ipv6_key->ipv6_frag = swkey->ip.frag; | |
c0618533 MM |
1245 | } else if (swkey->eth.type == htons(ETH_P_ARP) || |
1246 | swkey->eth.type == htons(ETH_P_RARP)) { | |
ccb1352e JG |
1247 | struct ovs_key_arp *arp_key; |
1248 | ||
1249 | nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key)); | |
1250 | if (!nla) | |
1251 | goto nla_put_failure; | |
1252 | arp_key = nla_data(nla); | |
1253 | memset(arp_key, 0, sizeof(struct ovs_key_arp)); | |
1254 | arp_key->arp_sip = swkey->ipv4.addr.src; | |
1255 | arp_key->arp_tip = swkey->ipv4.addr.dst; | |
1256 | arp_key->arp_op = htons(swkey->ip.proto); | |
1257 | memcpy(arp_key->arp_sha, swkey->ipv4.arp.sha, ETH_ALEN); | |
1258 | memcpy(arp_key->arp_tha, swkey->ipv4.arp.tha, ETH_ALEN); | |
1259 | } | |
1260 | ||
1261 | if ((swkey->eth.type == htons(ETH_P_IP) || | |
1262 | swkey->eth.type == htons(ETH_P_IPV6)) && | |
1263 | swkey->ip.frag != OVS_FRAG_TYPE_LATER) { | |
1264 | ||
1265 | if (swkey->ip.proto == IPPROTO_TCP) { | |
1266 | struct ovs_key_tcp *tcp_key; | |
1267 | ||
1268 | nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key)); | |
1269 | if (!nla) | |
1270 | goto nla_put_failure; | |
1271 | tcp_key = nla_data(nla); | |
1272 | if (swkey->eth.type == htons(ETH_P_IP)) { | |
1273 | tcp_key->tcp_src = swkey->ipv4.tp.src; | |
1274 | tcp_key->tcp_dst = swkey->ipv4.tp.dst; | |
1275 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1276 | tcp_key->tcp_src = swkey->ipv6.tp.src; | |
1277 | tcp_key->tcp_dst = swkey->ipv6.tp.dst; | |
1278 | } | |
1279 | } else if (swkey->ip.proto == IPPROTO_UDP) { | |
1280 | struct ovs_key_udp *udp_key; | |
1281 | ||
1282 | nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key)); | |
1283 | if (!nla) | |
1284 | goto nla_put_failure; | |
1285 | udp_key = nla_data(nla); | |
1286 | if (swkey->eth.type == htons(ETH_P_IP)) { | |
1287 | udp_key->udp_src = swkey->ipv4.tp.src; | |
1288 | udp_key->udp_dst = swkey->ipv4.tp.dst; | |
1289 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1290 | udp_key->udp_src = swkey->ipv6.tp.src; | |
1291 | udp_key->udp_dst = swkey->ipv6.tp.dst; | |
1292 | } | |
1293 | } else if (swkey->eth.type == htons(ETH_P_IP) && | |
1294 | swkey->ip.proto == IPPROTO_ICMP) { | |
1295 | struct ovs_key_icmp *icmp_key; | |
1296 | ||
1297 | nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key)); | |
1298 | if (!nla) | |
1299 | goto nla_put_failure; | |
1300 | icmp_key = nla_data(nla); | |
1301 | icmp_key->icmp_type = ntohs(swkey->ipv4.tp.src); | |
1302 | icmp_key->icmp_code = ntohs(swkey->ipv4.tp.dst); | |
1303 | } else if (swkey->eth.type == htons(ETH_P_IPV6) && | |
1304 | swkey->ip.proto == IPPROTO_ICMPV6) { | |
1305 | struct ovs_key_icmpv6 *icmpv6_key; | |
1306 | ||
1307 | nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6, | |
1308 | sizeof(*icmpv6_key)); | |
1309 | if (!nla) | |
1310 | goto nla_put_failure; | |
1311 | icmpv6_key = nla_data(nla); | |
1312 | icmpv6_key->icmpv6_type = ntohs(swkey->ipv6.tp.src); | |
1313 | icmpv6_key->icmpv6_code = ntohs(swkey->ipv6.tp.dst); | |
1314 | ||
1315 | if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
1316 | icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) { | |
1317 | struct ovs_key_nd *nd_key; | |
1318 | ||
1319 | nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key)); | |
1320 | if (!nla) | |
1321 | goto nla_put_failure; | |
1322 | nd_key = nla_data(nla); | |
1323 | memcpy(nd_key->nd_target, &swkey->ipv6.nd.target, | |
1324 | sizeof(nd_key->nd_target)); | |
1325 | memcpy(nd_key->nd_sll, swkey->ipv6.nd.sll, ETH_ALEN); | |
1326 | memcpy(nd_key->nd_tll, swkey->ipv6.nd.tll, ETH_ALEN); | |
1327 | } | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | unencap: | |
1332 | if (encap) | |
1333 | nla_nest_end(skb, encap); | |
1334 | ||
1335 | return 0; | |
1336 | ||
1337 | nla_put_failure: | |
1338 | return -EMSGSIZE; | |
1339 | } | |
1340 | ||
1341 | /* Initializes the flow module. | |
1342 | * Returns zero if successful or a negative error code. */ | |
1343 | int ovs_flow_init(void) | |
1344 | { | |
1345 | flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0, | |
1346 | 0, NULL); | |
1347 | if (flow_cache == NULL) | |
1348 | return -ENOMEM; | |
1349 | ||
1350 | return 0; | |
1351 | } | |
1352 | ||
1353 | /* Uninitializes the flow module. */ | |
1354 | void ovs_flow_exit(void) | |
1355 | { | |
1356 | kmem_cache_destroy(flow_cache); | |
1357 | } |