Commit | Line | Data |
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ccb1352e JG |
1 | /* |
2 | * Copyright (c) 2007-2011 Nicira Networks. | |
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 | ||
185 | if (flow->key.eth.type == htons(ETH_P_IP) && | |
186 | flow->key.ip.proto == IPPROTO_TCP) { | |
187 | u8 *tcp = (u8 *)tcp_hdr(skb); | |
188 | tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK; | |
189 | } | |
190 | ||
191 | spin_lock(&flow->lock); | |
192 | flow->used = jiffies; | |
193 | flow->packet_count++; | |
194 | flow->byte_count += skb->len; | |
195 | flow->tcp_flags |= tcp_flags; | |
196 | spin_unlock(&flow->lock); | |
197 | } | |
198 | ||
199 | struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *actions) | |
200 | { | |
201 | int actions_len = nla_len(actions); | |
202 | struct sw_flow_actions *sfa; | |
203 | ||
204 | /* At least DP_MAX_PORTS actions are required to be able to flood a | |
205 | * packet to every port. Factor of 2 allows for setting VLAN tags, | |
206 | * etc. */ | |
207 | if (actions_len > 2 * DP_MAX_PORTS * nla_total_size(4)) | |
208 | return ERR_PTR(-EINVAL); | |
209 | ||
210 | sfa = kmalloc(sizeof(*sfa) + actions_len, GFP_KERNEL); | |
211 | if (!sfa) | |
212 | return ERR_PTR(-ENOMEM); | |
213 | ||
214 | sfa->actions_len = actions_len; | |
215 | memcpy(sfa->actions, nla_data(actions), actions_len); | |
216 | return sfa; | |
217 | } | |
218 | ||
219 | struct sw_flow *ovs_flow_alloc(void) | |
220 | { | |
221 | struct sw_flow *flow; | |
222 | ||
223 | flow = kmem_cache_alloc(flow_cache, GFP_KERNEL); | |
224 | if (!flow) | |
225 | return ERR_PTR(-ENOMEM); | |
226 | ||
227 | spin_lock_init(&flow->lock); | |
228 | flow->sf_acts = NULL; | |
229 | ||
230 | return flow; | |
231 | } | |
232 | ||
233 | static struct hlist_head *find_bucket(struct flow_table *table, u32 hash) | |
234 | { | |
235 | hash = jhash_1word(hash, table->hash_seed); | |
236 | return flex_array_get(table->buckets, | |
237 | (hash & (table->n_buckets - 1))); | |
238 | } | |
239 | ||
240 | static struct flex_array *alloc_buckets(unsigned int n_buckets) | |
241 | { | |
242 | struct flex_array *buckets; | |
243 | int i, err; | |
244 | ||
245 | buckets = flex_array_alloc(sizeof(struct hlist_head *), | |
246 | n_buckets, GFP_KERNEL); | |
247 | if (!buckets) | |
248 | return NULL; | |
249 | ||
250 | err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL); | |
251 | if (err) { | |
252 | flex_array_free(buckets); | |
253 | return NULL; | |
254 | } | |
255 | ||
256 | for (i = 0; i < n_buckets; i++) | |
257 | INIT_HLIST_HEAD((struct hlist_head *) | |
258 | flex_array_get(buckets, i)); | |
259 | ||
260 | return buckets; | |
261 | } | |
262 | ||
263 | static void free_buckets(struct flex_array *buckets) | |
264 | { | |
265 | flex_array_free(buckets); | |
266 | } | |
267 | ||
268 | struct flow_table *ovs_flow_tbl_alloc(int new_size) | |
269 | { | |
270 | struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL); | |
271 | ||
272 | if (!table) | |
273 | return NULL; | |
274 | ||
275 | table->buckets = alloc_buckets(new_size); | |
276 | ||
277 | if (!table->buckets) { | |
278 | kfree(table); | |
279 | return NULL; | |
280 | } | |
281 | table->n_buckets = new_size; | |
282 | table->count = 0; | |
283 | table->node_ver = 0; | |
284 | table->keep_flows = false; | |
285 | get_random_bytes(&table->hash_seed, sizeof(u32)); | |
286 | ||
287 | return table; | |
288 | } | |
289 | ||
290 | void ovs_flow_tbl_destroy(struct flow_table *table) | |
291 | { | |
292 | int i; | |
293 | ||
294 | if (!table) | |
295 | return; | |
296 | ||
297 | if (table->keep_flows) | |
298 | goto skip_flows; | |
299 | ||
300 | for (i = 0; i < table->n_buckets; i++) { | |
301 | struct sw_flow *flow; | |
302 | struct hlist_head *head = flex_array_get(table->buckets, i); | |
303 | struct hlist_node *node, *n; | |
304 | int ver = table->node_ver; | |
305 | ||
306 | hlist_for_each_entry_safe(flow, node, n, head, hash_node[ver]) { | |
307 | hlist_del_rcu(&flow->hash_node[ver]); | |
308 | ovs_flow_free(flow); | |
309 | } | |
310 | } | |
311 | ||
312 | skip_flows: | |
313 | free_buckets(table->buckets); | |
314 | kfree(table); | |
315 | } | |
316 | ||
317 | static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu) | |
318 | { | |
319 | struct flow_table *table = container_of(rcu, struct flow_table, rcu); | |
320 | ||
321 | ovs_flow_tbl_destroy(table); | |
322 | } | |
323 | ||
324 | void ovs_flow_tbl_deferred_destroy(struct flow_table *table) | |
325 | { | |
326 | if (!table) | |
327 | return; | |
328 | ||
329 | call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb); | |
330 | } | |
331 | ||
332 | struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *last) | |
333 | { | |
334 | struct sw_flow *flow; | |
335 | struct hlist_head *head; | |
336 | struct hlist_node *n; | |
337 | int ver; | |
338 | int i; | |
339 | ||
340 | ver = table->node_ver; | |
341 | while (*bucket < table->n_buckets) { | |
342 | i = 0; | |
343 | head = flex_array_get(table->buckets, *bucket); | |
344 | hlist_for_each_entry_rcu(flow, n, head, hash_node[ver]) { | |
345 | if (i < *last) { | |
346 | i++; | |
347 | continue; | |
348 | } | |
349 | *last = i + 1; | |
350 | return flow; | |
351 | } | |
352 | (*bucket)++; | |
353 | *last = 0; | |
354 | } | |
355 | ||
356 | return NULL; | |
357 | } | |
358 | ||
359 | static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new) | |
360 | { | |
361 | int old_ver; | |
362 | int i; | |
363 | ||
364 | old_ver = old->node_ver; | |
365 | new->node_ver = !old_ver; | |
366 | ||
367 | /* Insert in new table. */ | |
368 | for (i = 0; i < old->n_buckets; i++) { | |
369 | struct sw_flow *flow; | |
370 | struct hlist_head *head; | |
371 | struct hlist_node *n; | |
372 | ||
373 | head = flex_array_get(old->buckets, i); | |
374 | ||
375 | hlist_for_each_entry(flow, n, head, hash_node[old_ver]) | |
376 | ovs_flow_tbl_insert(new, flow); | |
377 | } | |
378 | old->keep_flows = true; | |
379 | } | |
380 | ||
381 | static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets) | |
382 | { | |
383 | struct flow_table *new_table; | |
384 | ||
385 | new_table = ovs_flow_tbl_alloc(n_buckets); | |
386 | if (!new_table) | |
387 | return ERR_PTR(-ENOMEM); | |
388 | ||
389 | flow_table_copy_flows(table, new_table); | |
390 | ||
391 | return new_table; | |
392 | } | |
393 | ||
394 | struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table) | |
395 | { | |
396 | return __flow_tbl_rehash(table, table->n_buckets); | |
397 | } | |
398 | ||
399 | struct flow_table *ovs_flow_tbl_expand(struct flow_table *table) | |
400 | { | |
401 | return __flow_tbl_rehash(table, table->n_buckets * 2); | |
402 | } | |
403 | ||
404 | void ovs_flow_free(struct sw_flow *flow) | |
405 | { | |
406 | if (unlikely(!flow)) | |
407 | return; | |
408 | ||
409 | kfree((struct sf_flow_acts __force *)flow->sf_acts); | |
410 | kmem_cache_free(flow_cache, flow); | |
411 | } | |
412 | ||
413 | /* RCU callback used by ovs_flow_deferred_free. */ | |
414 | static void rcu_free_flow_callback(struct rcu_head *rcu) | |
415 | { | |
416 | struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); | |
417 | ||
418 | ovs_flow_free(flow); | |
419 | } | |
420 | ||
421 | /* Schedules 'flow' to be freed after the next RCU grace period. | |
422 | * The caller must hold rcu_read_lock for this to be sensible. */ | |
423 | void ovs_flow_deferred_free(struct sw_flow *flow) | |
424 | { | |
425 | call_rcu(&flow->rcu, rcu_free_flow_callback); | |
426 | } | |
427 | ||
428 | /* RCU callback used by ovs_flow_deferred_free_acts. */ | |
429 | static void rcu_free_acts_callback(struct rcu_head *rcu) | |
430 | { | |
431 | struct sw_flow_actions *sf_acts = container_of(rcu, | |
432 | struct sw_flow_actions, rcu); | |
433 | kfree(sf_acts); | |
434 | } | |
435 | ||
436 | /* Schedules 'sf_acts' to be freed after the next RCU grace period. | |
437 | * The caller must hold rcu_read_lock for this to be sensible. */ | |
438 | void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts) | |
439 | { | |
440 | call_rcu(&sf_acts->rcu, rcu_free_acts_callback); | |
441 | } | |
442 | ||
443 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) | |
444 | { | |
445 | struct qtag_prefix { | |
446 | __be16 eth_type; /* ETH_P_8021Q */ | |
447 | __be16 tci; | |
448 | }; | |
449 | struct qtag_prefix *qp; | |
450 | ||
451 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) | |
452 | return 0; | |
453 | ||
454 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + | |
455 | sizeof(__be16)))) | |
456 | return -ENOMEM; | |
457 | ||
458 | qp = (struct qtag_prefix *) skb->data; | |
459 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); | |
460 | __skb_pull(skb, sizeof(struct qtag_prefix)); | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | static __be16 parse_ethertype(struct sk_buff *skb) | |
466 | { | |
467 | struct llc_snap_hdr { | |
468 | u8 dsap; /* Always 0xAA */ | |
469 | u8 ssap; /* Always 0xAA */ | |
470 | u8 ctrl; | |
471 | u8 oui[3]; | |
472 | __be16 ethertype; | |
473 | }; | |
474 | struct llc_snap_hdr *llc; | |
475 | __be16 proto; | |
476 | ||
477 | proto = *(__be16 *) skb->data; | |
478 | __skb_pull(skb, sizeof(__be16)); | |
479 | ||
480 | if (ntohs(proto) >= 1536) | |
481 | return proto; | |
482 | ||
483 | if (skb->len < sizeof(struct llc_snap_hdr)) | |
484 | return htons(ETH_P_802_2); | |
485 | ||
486 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) | |
487 | return htons(0); | |
488 | ||
489 | llc = (struct llc_snap_hdr *) skb->data; | |
490 | if (llc->dsap != LLC_SAP_SNAP || | |
491 | llc->ssap != LLC_SAP_SNAP || | |
492 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
493 | return htons(ETH_P_802_2); | |
494 | ||
495 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
496 | return llc->ethertype; | |
497 | } | |
498 | ||
499 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, | |
500 | int *key_lenp, int nh_len) | |
501 | { | |
502 | struct icmp6hdr *icmp = icmp6_hdr(skb); | |
503 | int error = 0; | |
504 | int key_len; | |
505 | ||
506 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
507 | * fields, so we need to store them in 16-bit network byte order. | |
508 | */ | |
509 | key->ipv6.tp.src = htons(icmp->icmp6_type); | |
510 | key->ipv6.tp.dst = htons(icmp->icmp6_code); | |
511 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
512 | ||
513 | if (icmp->icmp6_code == 0 && | |
514 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
515 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
516 | int icmp_len = skb->len - skb_transport_offset(skb); | |
517 | struct nd_msg *nd; | |
518 | int offset; | |
519 | ||
520 | key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); | |
521 | ||
522 | /* In order to process neighbor discovery options, we need the | |
523 | * entire packet. | |
524 | */ | |
525 | if (unlikely(icmp_len < sizeof(*nd))) | |
526 | goto out; | |
527 | if (unlikely(skb_linearize(skb))) { | |
528 | error = -ENOMEM; | |
529 | goto out; | |
530 | } | |
531 | ||
532 | nd = (struct nd_msg *)skb_transport_header(skb); | |
533 | key->ipv6.nd.target = nd->target; | |
534 | key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); | |
535 | ||
536 | icmp_len -= sizeof(*nd); | |
537 | offset = 0; | |
538 | while (icmp_len >= 8) { | |
539 | struct nd_opt_hdr *nd_opt = | |
540 | (struct nd_opt_hdr *)(nd->opt + offset); | |
541 | int opt_len = nd_opt->nd_opt_len * 8; | |
542 | ||
543 | if (unlikely(!opt_len || opt_len > icmp_len)) | |
544 | goto invalid; | |
545 | ||
546 | /* Store the link layer address if the appropriate | |
547 | * option is provided. It is considered an error if | |
548 | * the same link layer option is specified twice. | |
549 | */ | |
550 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR | |
551 | && opt_len == 8) { | |
552 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) | |
553 | goto invalid; | |
554 | memcpy(key->ipv6.nd.sll, | |
555 | &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN); | |
556 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR | |
557 | && opt_len == 8) { | |
558 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) | |
559 | goto invalid; | |
560 | memcpy(key->ipv6.nd.tll, | |
561 | &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN); | |
562 | } | |
563 | ||
564 | icmp_len -= opt_len; | |
565 | offset += opt_len; | |
566 | } | |
567 | } | |
568 | ||
569 | goto out; | |
570 | ||
571 | invalid: | |
572 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); | |
573 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
574 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
575 | ||
576 | out: | |
577 | *key_lenp = key_len; | |
578 | return error; | |
579 | } | |
580 | ||
581 | /** | |
582 | * ovs_flow_extract - extracts a flow key from an Ethernet frame. | |
583 | * @skb: sk_buff that contains the frame, with skb->data pointing to the | |
584 | * Ethernet header | |
585 | * @in_port: port number on which @skb was received. | |
586 | * @key: output flow key | |
587 | * @key_lenp: length of output flow key | |
588 | * | |
589 | * The caller must ensure that skb->len >= ETH_HLEN. | |
590 | * | |
591 | * Returns 0 if successful, otherwise a negative errno value. | |
592 | * | |
593 | * Initializes @skb header pointers as follows: | |
594 | * | |
595 | * - skb->mac_header: the Ethernet header. | |
596 | * | |
597 | * - skb->network_header: just past the Ethernet header, or just past the | |
598 | * VLAN header, to the first byte of the Ethernet payload. | |
599 | * | |
600 | * - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6 | |
601 | * on output, then just past the IP header, if one is present and | |
602 | * of a correct length, otherwise the same as skb->network_header. | |
603 | * For other key->dl_type values it is left untouched. | |
604 | */ | |
605 | int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key, | |
606 | int *key_lenp) | |
607 | { | |
608 | int error = 0; | |
609 | int key_len = SW_FLOW_KEY_OFFSET(eth); | |
610 | struct ethhdr *eth; | |
611 | ||
612 | memset(key, 0, sizeof(*key)); | |
613 | ||
614 | key->phy.priority = skb->priority; | |
615 | key->phy.in_port = in_port; | |
616 | ||
617 | skb_reset_mac_header(skb); | |
618 | ||
619 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet | |
620 | * header in the linear data area. | |
621 | */ | |
622 | eth = eth_hdr(skb); | |
623 | memcpy(key->eth.src, eth->h_source, ETH_ALEN); | |
624 | memcpy(key->eth.dst, eth->h_dest, ETH_ALEN); | |
625 | ||
626 | __skb_pull(skb, 2 * ETH_ALEN); | |
627 | ||
628 | if (vlan_tx_tag_present(skb)) | |
629 | key->eth.tci = htons(skb->vlan_tci); | |
630 | else if (eth->h_proto == htons(ETH_P_8021Q)) | |
631 | if (unlikely(parse_vlan(skb, key))) | |
632 | return -ENOMEM; | |
633 | ||
634 | key->eth.type = parse_ethertype(skb); | |
635 | if (unlikely(key->eth.type == htons(0))) | |
636 | return -ENOMEM; | |
637 | ||
638 | skb_reset_network_header(skb); | |
639 | __skb_push(skb, skb->data - skb_mac_header(skb)); | |
640 | ||
641 | /* Network layer. */ | |
642 | if (key->eth.type == htons(ETH_P_IP)) { | |
643 | struct iphdr *nh; | |
644 | __be16 offset; | |
645 | ||
646 | key_len = SW_FLOW_KEY_OFFSET(ipv4.addr); | |
647 | ||
648 | error = check_iphdr(skb); | |
649 | if (unlikely(error)) { | |
650 | if (error == -EINVAL) { | |
651 | skb->transport_header = skb->network_header; | |
652 | error = 0; | |
653 | } | |
654 | goto out; | |
655 | } | |
656 | ||
657 | nh = ip_hdr(skb); | |
658 | key->ipv4.addr.src = nh->saddr; | |
659 | key->ipv4.addr.dst = nh->daddr; | |
660 | ||
661 | key->ip.proto = nh->protocol; | |
662 | key->ip.tos = nh->tos; | |
663 | key->ip.ttl = nh->ttl; | |
664 | ||
665 | offset = nh->frag_off & htons(IP_OFFSET); | |
666 | if (offset) { | |
667 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
668 | goto out; | |
669 | } | |
670 | if (nh->frag_off & htons(IP_MF) || | |
671 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
672 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
673 | ||
674 | /* Transport layer. */ | |
675 | if (key->ip.proto == IPPROTO_TCP) { | |
676 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
677 | if (tcphdr_ok(skb)) { | |
678 | struct tcphdr *tcp = tcp_hdr(skb); | |
679 | key->ipv4.tp.src = tcp->source; | |
680 | key->ipv4.tp.dst = tcp->dest; | |
681 | } | |
682 | } else if (key->ip.proto == IPPROTO_UDP) { | |
683 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
684 | if (udphdr_ok(skb)) { | |
685 | struct udphdr *udp = udp_hdr(skb); | |
686 | key->ipv4.tp.src = udp->source; | |
687 | key->ipv4.tp.dst = udp->dest; | |
688 | } | |
689 | } else if (key->ip.proto == IPPROTO_ICMP) { | |
690 | key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
691 | if (icmphdr_ok(skb)) { | |
692 | struct icmphdr *icmp = icmp_hdr(skb); | |
693 | /* The ICMP type and code fields use the 16-bit | |
694 | * transport port fields, so we need to store | |
695 | * them in 16-bit network byte order. */ | |
696 | key->ipv4.tp.src = htons(icmp->type); | |
697 | key->ipv4.tp.dst = htons(icmp->code); | |
698 | } | |
699 | } | |
700 | ||
701 | } else if (key->eth.type == htons(ETH_P_ARP) && arphdr_ok(skb)) { | |
702 | struct arp_eth_header *arp; | |
703 | ||
704 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
705 | ||
706 | if (arp->ar_hrd == htons(ARPHRD_ETHER) | |
707 | && arp->ar_pro == htons(ETH_P_IP) | |
708 | && arp->ar_hln == ETH_ALEN | |
709 | && arp->ar_pln == 4) { | |
710 | ||
711 | /* We only match on the lower 8 bits of the opcode. */ | |
712 | if (ntohs(arp->ar_op) <= 0xff) | |
713 | key->ip.proto = ntohs(arp->ar_op); | |
714 | ||
715 | if (key->ip.proto == ARPOP_REQUEST | |
716 | || key->ip.proto == ARPOP_REPLY) { | |
717 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); | |
718 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
719 | memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN); | |
720 | memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN); | |
721 | key_len = SW_FLOW_KEY_OFFSET(ipv4.arp); | |
722 | } | |
723 | } | |
724 | } else if (key->eth.type == htons(ETH_P_IPV6)) { | |
725 | int nh_len; /* IPv6 Header + Extensions */ | |
726 | ||
727 | nh_len = parse_ipv6hdr(skb, key, &key_len); | |
728 | if (unlikely(nh_len < 0)) { | |
729 | if (nh_len == -EINVAL) | |
730 | skb->transport_header = skb->network_header; | |
731 | else | |
732 | error = nh_len; | |
733 | goto out; | |
734 | } | |
735 | ||
736 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) | |
737 | goto out; | |
738 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
739 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
740 | ||
741 | /* Transport layer. */ | |
742 | if (key->ip.proto == NEXTHDR_TCP) { | |
743 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
744 | if (tcphdr_ok(skb)) { | |
745 | struct tcphdr *tcp = tcp_hdr(skb); | |
746 | key->ipv6.tp.src = tcp->source; | |
747 | key->ipv6.tp.dst = tcp->dest; | |
748 | } | |
749 | } else if (key->ip.proto == NEXTHDR_UDP) { | |
750 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
751 | if (udphdr_ok(skb)) { | |
752 | struct udphdr *udp = udp_hdr(skb); | |
753 | key->ipv6.tp.src = udp->source; | |
754 | key->ipv6.tp.dst = udp->dest; | |
755 | } | |
756 | } else if (key->ip.proto == NEXTHDR_ICMP) { | |
757 | key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
758 | if (icmp6hdr_ok(skb)) { | |
759 | error = parse_icmpv6(skb, key, &key_len, nh_len); | |
760 | if (error < 0) | |
761 | goto out; | |
762 | } | |
763 | } | |
764 | } | |
765 | ||
766 | out: | |
767 | *key_lenp = key_len; | |
768 | return error; | |
769 | } | |
770 | ||
771 | u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len) | |
772 | { | |
773 | return jhash2((u32 *)key, DIV_ROUND_UP(key_len, sizeof(u32)), 0); | |
774 | } | |
775 | ||
776 | struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table, | |
777 | struct sw_flow_key *key, int key_len) | |
778 | { | |
779 | struct sw_flow *flow; | |
780 | struct hlist_node *n; | |
781 | struct hlist_head *head; | |
782 | u32 hash; | |
783 | ||
784 | hash = ovs_flow_hash(key, key_len); | |
785 | ||
786 | head = find_bucket(table, hash); | |
787 | hlist_for_each_entry_rcu(flow, n, head, hash_node[table->node_ver]) { | |
788 | ||
789 | if (flow->hash == hash && | |
790 | !memcmp(&flow->key, key, key_len)) { | |
791 | return flow; | |
792 | } | |
793 | } | |
794 | return NULL; | |
795 | } | |
796 | ||
797 | void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow) | |
798 | { | |
799 | struct hlist_head *head; | |
800 | ||
801 | head = find_bucket(table, flow->hash); | |
802 | hlist_add_head_rcu(&flow->hash_node[table->node_ver], head); | |
803 | table->count++; | |
804 | } | |
805 | ||
806 | void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow) | |
807 | { | |
808 | hlist_del_rcu(&flow->hash_node[table->node_ver]); | |
809 | table->count--; | |
810 | BUG_ON(table->count < 0); | |
811 | } | |
812 | ||
813 | /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */ | |
814 | const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = { | |
815 | [OVS_KEY_ATTR_ENCAP] = -1, | |
816 | [OVS_KEY_ATTR_PRIORITY] = sizeof(u32), | |
817 | [OVS_KEY_ATTR_IN_PORT] = sizeof(u32), | |
818 | [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet), | |
819 | [OVS_KEY_ATTR_VLAN] = sizeof(__be16), | |
820 | [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16), | |
821 | [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4), | |
822 | [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6), | |
823 | [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp), | |
824 | [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp), | |
825 | [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp), | |
826 | [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6), | |
827 | [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp), | |
828 | [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd), | |
829 | }; | |
830 | ||
831 | static int ipv4_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len, | |
832 | const struct nlattr *a[], u32 *attrs) | |
833 | { | |
834 | const struct ovs_key_icmp *icmp_key; | |
835 | const struct ovs_key_tcp *tcp_key; | |
836 | const struct ovs_key_udp *udp_key; | |
837 | ||
838 | switch (swkey->ip.proto) { | |
839 | case IPPROTO_TCP: | |
840 | if (!(*attrs & (1 << OVS_KEY_ATTR_TCP))) | |
841 | return -EINVAL; | |
842 | *attrs &= ~(1 << OVS_KEY_ATTR_TCP); | |
843 | ||
844 | *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
845 | tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); | |
846 | swkey->ipv4.tp.src = tcp_key->tcp_src; | |
847 | swkey->ipv4.tp.dst = tcp_key->tcp_dst; | |
848 | break; | |
849 | ||
850 | case IPPROTO_UDP: | |
851 | if (!(*attrs & (1 << OVS_KEY_ATTR_UDP))) | |
852 | return -EINVAL; | |
853 | *attrs &= ~(1 << OVS_KEY_ATTR_UDP); | |
854 | ||
855 | *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
856 | udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); | |
857 | swkey->ipv4.tp.src = udp_key->udp_src; | |
858 | swkey->ipv4.tp.dst = udp_key->udp_dst; | |
859 | break; | |
860 | ||
861 | case IPPROTO_ICMP: | |
862 | if (!(*attrs & (1 << OVS_KEY_ATTR_ICMP))) | |
863 | return -EINVAL; | |
864 | *attrs &= ~(1 << OVS_KEY_ATTR_ICMP); | |
865 | ||
866 | *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); | |
867 | icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]); | |
868 | swkey->ipv4.tp.src = htons(icmp_key->icmp_type); | |
869 | swkey->ipv4.tp.dst = htons(icmp_key->icmp_code); | |
870 | break; | |
871 | } | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
876 | static int ipv6_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len, | |
877 | const struct nlattr *a[], u32 *attrs) | |
878 | { | |
879 | const struct ovs_key_icmpv6 *icmpv6_key; | |
880 | const struct ovs_key_tcp *tcp_key; | |
881 | const struct ovs_key_udp *udp_key; | |
882 | ||
883 | switch (swkey->ip.proto) { | |
884 | case IPPROTO_TCP: | |
885 | if (!(*attrs & (1 << OVS_KEY_ATTR_TCP))) | |
886 | return -EINVAL; | |
887 | *attrs &= ~(1 << OVS_KEY_ATTR_TCP); | |
888 | ||
889 | *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
890 | tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); | |
891 | swkey->ipv6.tp.src = tcp_key->tcp_src; | |
892 | swkey->ipv6.tp.dst = tcp_key->tcp_dst; | |
893 | break; | |
894 | ||
895 | case IPPROTO_UDP: | |
896 | if (!(*attrs & (1 << OVS_KEY_ATTR_UDP))) | |
897 | return -EINVAL; | |
898 | *attrs &= ~(1 << OVS_KEY_ATTR_UDP); | |
899 | ||
900 | *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
901 | udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); | |
902 | swkey->ipv6.tp.src = udp_key->udp_src; | |
903 | swkey->ipv6.tp.dst = udp_key->udp_dst; | |
904 | break; | |
905 | ||
906 | case IPPROTO_ICMPV6: | |
907 | if (!(*attrs & (1 << OVS_KEY_ATTR_ICMPV6))) | |
908 | return -EINVAL; | |
909 | *attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6); | |
910 | ||
911 | *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); | |
912 | icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]); | |
913 | swkey->ipv6.tp.src = htons(icmpv6_key->icmpv6_type); | |
914 | swkey->ipv6.tp.dst = htons(icmpv6_key->icmpv6_code); | |
915 | ||
916 | if (swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) || | |
917 | swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
918 | const struct ovs_key_nd *nd_key; | |
919 | ||
920 | if (!(*attrs & (1 << OVS_KEY_ATTR_ND))) | |
921 | return -EINVAL; | |
922 | *attrs &= ~(1 << OVS_KEY_ATTR_ND); | |
923 | ||
924 | *key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); | |
925 | nd_key = nla_data(a[OVS_KEY_ATTR_ND]); | |
926 | memcpy(&swkey->ipv6.nd.target, nd_key->nd_target, | |
927 | sizeof(swkey->ipv6.nd.target)); | |
928 | memcpy(swkey->ipv6.nd.sll, nd_key->nd_sll, ETH_ALEN); | |
929 | memcpy(swkey->ipv6.nd.tll, nd_key->nd_tll, ETH_ALEN); | |
930 | } | |
931 | break; | |
932 | } | |
933 | ||
934 | return 0; | |
935 | } | |
936 | ||
937 | static int parse_flow_nlattrs(const struct nlattr *attr, | |
938 | const struct nlattr *a[], u32 *attrsp) | |
939 | { | |
940 | const struct nlattr *nla; | |
941 | u32 attrs; | |
942 | int rem; | |
943 | ||
944 | attrs = 0; | |
945 | nla_for_each_nested(nla, attr, rem) { | |
946 | u16 type = nla_type(nla); | |
947 | int expected_len; | |
948 | ||
949 | if (type > OVS_KEY_ATTR_MAX || attrs & (1 << type)) | |
950 | return -EINVAL; | |
951 | ||
952 | expected_len = ovs_key_lens[type]; | |
953 | if (nla_len(nla) != expected_len && expected_len != -1) | |
954 | return -EINVAL; | |
955 | ||
956 | attrs |= 1 << type; | |
957 | a[type] = nla; | |
958 | } | |
959 | if (rem) | |
960 | return -EINVAL; | |
961 | ||
962 | *attrsp = attrs; | |
963 | return 0; | |
964 | } | |
965 | ||
966 | /** | |
967 | * ovs_flow_from_nlattrs - parses Netlink attributes into a flow key. | |
968 | * @swkey: receives the extracted flow key. | |
969 | * @key_lenp: number of bytes used in @swkey. | |
970 | * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute | |
971 | * sequence. | |
972 | */ | |
973 | int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, | |
974 | const struct nlattr *attr) | |
975 | { | |
976 | const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; | |
977 | const struct ovs_key_ethernet *eth_key; | |
978 | int key_len; | |
979 | u32 attrs; | |
980 | int err; | |
981 | ||
982 | memset(swkey, 0, sizeof(struct sw_flow_key)); | |
983 | key_len = SW_FLOW_KEY_OFFSET(eth); | |
984 | ||
985 | err = parse_flow_nlattrs(attr, a, &attrs); | |
986 | if (err) | |
987 | return err; | |
988 | ||
989 | /* Metadata attributes. */ | |
990 | if (attrs & (1 << OVS_KEY_ATTR_PRIORITY)) { | |
991 | swkey->phy.priority = nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]); | |
992 | attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY); | |
993 | } | |
994 | if (attrs & (1 << OVS_KEY_ATTR_IN_PORT)) { | |
995 | u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]); | |
996 | if (in_port >= DP_MAX_PORTS) | |
997 | return -EINVAL; | |
998 | swkey->phy.in_port = in_port; | |
999 | attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT); | |
1000 | } else { | |
1001 | swkey->phy.in_port = USHRT_MAX; | |
1002 | } | |
1003 | ||
1004 | /* Data attributes. */ | |
1005 | if (!(attrs & (1 << OVS_KEY_ATTR_ETHERNET))) | |
1006 | return -EINVAL; | |
1007 | attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET); | |
1008 | ||
1009 | eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]); | |
1010 | memcpy(swkey->eth.src, eth_key->eth_src, ETH_ALEN); | |
1011 | memcpy(swkey->eth.dst, eth_key->eth_dst, ETH_ALEN); | |
1012 | ||
1013 | if (attrs & (1u << OVS_KEY_ATTR_ETHERTYPE) && | |
1014 | nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q)) { | |
1015 | const struct nlattr *encap; | |
1016 | __be16 tci; | |
1017 | ||
1018 | if (attrs != ((1 << OVS_KEY_ATTR_VLAN) | | |
1019 | (1 << OVS_KEY_ATTR_ETHERTYPE) | | |
1020 | (1 << OVS_KEY_ATTR_ENCAP))) | |
1021 | return -EINVAL; | |
1022 | ||
1023 | encap = a[OVS_KEY_ATTR_ENCAP]; | |
1024 | tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); | |
1025 | if (tci & htons(VLAN_TAG_PRESENT)) { | |
1026 | swkey->eth.tci = tci; | |
1027 | ||
1028 | err = parse_flow_nlattrs(encap, a, &attrs); | |
1029 | if (err) | |
1030 | return err; | |
1031 | } else if (!tci) { | |
1032 | /* Corner case for truncated 802.1Q header. */ | |
1033 | if (nla_len(encap)) | |
1034 | return -EINVAL; | |
1035 | ||
1036 | swkey->eth.type = htons(ETH_P_8021Q); | |
1037 | *key_lenp = key_len; | |
1038 | return 0; | |
1039 | } else { | |
1040 | return -EINVAL; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) { | |
1045 | swkey->eth.type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); | |
1046 | if (ntohs(swkey->eth.type) < 1536) | |
1047 | return -EINVAL; | |
1048 | attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); | |
1049 | } else { | |
1050 | swkey->eth.type = htons(ETH_P_802_2); | |
1051 | } | |
1052 | ||
1053 | if (swkey->eth.type == htons(ETH_P_IP)) { | |
1054 | const struct ovs_key_ipv4 *ipv4_key; | |
1055 | ||
1056 | if (!(attrs & (1 << OVS_KEY_ATTR_IPV4))) | |
1057 | return -EINVAL; | |
1058 | attrs &= ~(1 << OVS_KEY_ATTR_IPV4); | |
1059 | ||
1060 | key_len = SW_FLOW_KEY_OFFSET(ipv4.addr); | |
1061 | ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]); | |
1062 | if (ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) | |
1063 | return -EINVAL; | |
1064 | swkey->ip.proto = ipv4_key->ipv4_proto; | |
1065 | swkey->ip.tos = ipv4_key->ipv4_tos; | |
1066 | swkey->ip.ttl = ipv4_key->ipv4_ttl; | |
1067 | swkey->ip.frag = ipv4_key->ipv4_frag; | |
1068 | swkey->ipv4.addr.src = ipv4_key->ipv4_src; | |
1069 | swkey->ipv4.addr.dst = ipv4_key->ipv4_dst; | |
1070 | ||
1071 | if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) { | |
1072 | err = ipv4_flow_from_nlattrs(swkey, &key_len, a, &attrs); | |
1073 | if (err) | |
1074 | return err; | |
1075 | } | |
1076 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1077 | const struct ovs_key_ipv6 *ipv6_key; | |
1078 | ||
1079 | if (!(attrs & (1 << OVS_KEY_ATTR_IPV6))) | |
1080 | return -EINVAL; | |
1081 | attrs &= ~(1 << OVS_KEY_ATTR_IPV6); | |
1082 | ||
1083 | key_len = SW_FLOW_KEY_OFFSET(ipv6.label); | |
1084 | ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]); | |
1085 | if (ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) | |
1086 | return -EINVAL; | |
1087 | swkey->ipv6.label = ipv6_key->ipv6_label; | |
1088 | swkey->ip.proto = ipv6_key->ipv6_proto; | |
1089 | swkey->ip.tos = ipv6_key->ipv6_tclass; | |
1090 | swkey->ip.ttl = ipv6_key->ipv6_hlimit; | |
1091 | swkey->ip.frag = ipv6_key->ipv6_frag; | |
1092 | memcpy(&swkey->ipv6.addr.src, ipv6_key->ipv6_src, | |
1093 | sizeof(swkey->ipv6.addr.src)); | |
1094 | memcpy(&swkey->ipv6.addr.dst, ipv6_key->ipv6_dst, | |
1095 | sizeof(swkey->ipv6.addr.dst)); | |
1096 | ||
1097 | if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) { | |
1098 | err = ipv6_flow_from_nlattrs(swkey, &key_len, a, &attrs); | |
1099 | if (err) | |
1100 | return err; | |
1101 | } | |
1102 | } else if (swkey->eth.type == htons(ETH_P_ARP)) { | |
1103 | const struct ovs_key_arp *arp_key; | |
1104 | ||
1105 | if (!(attrs & (1 << OVS_KEY_ATTR_ARP))) | |
1106 | return -EINVAL; | |
1107 | attrs &= ~(1 << OVS_KEY_ATTR_ARP); | |
1108 | ||
1109 | key_len = SW_FLOW_KEY_OFFSET(ipv4.arp); | |
1110 | arp_key = nla_data(a[OVS_KEY_ATTR_ARP]); | |
1111 | swkey->ipv4.addr.src = arp_key->arp_sip; | |
1112 | swkey->ipv4.addr.dst = arp_key->arp_tip; | |
1113 | if (arp_key->arp_op & htons(0xff00)) | |
1114 | return -EINVAL; | |
1115 | swkey->ip.proto = ntohs(arp_key->arp_op); | |
1116 | memcpy(swkey->ipv4.arp.sha, arp_key->arp_sha, ETH_ALEN); | |
1117 | memcpy(swkey->ipv4.arp.tha, arp_key->arp_tha, ETH_ALEN); | |
1118 | } | |
1119 | ||
1120 | if (attrs) | |
1121 | return -EINVAL; | |
1122 | *key_lenp = key_len; | |
1123 | ||
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | /** | |
1128 | * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key. | |
1129 | * @in_port: receives the extracted input port. | |
1130 | * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute | |
1131 | * sequence. | |
1132 | * | |
1133 | * This parses a series of Netlink attributes that form a flow key, which must | |
1134 | * take the same form accepted by flow_from_nlattrs(), but only enough of it to | |
1135 | * get the metadata, that is, the parts of the flow key that cannot be | |
1136 | * extracted from the packet itself. | |
1137 | */ | |
1138 | int ovs_flow_metadata_from_nlattrs(u32 *priority, u16 *in_port, | |
1139 | const struct nlattr *attr) | |
1140 | { | |
1141 | const struct nlattr *nla; | |
1142 | int rem; | |
1143 | ||
1144 | *in_port = USHRT_MAX; | |
1145 | *priority = 0; | |
1146 | ||
1147 | nla_for_each_nested(nla, attr, rem) { | |
1148 | int type = nla_type(nla); | |
1149 | ||
1150 | if (type <= OVS_KEY_ATTR_MAX && ovs_key_lens[type] > 0) { | |
1151 | if (nla_len(nla) != ovs_key_lens[type]) | |
1152 | return -EINVAL; | |
1153 | ||
1154 | switch (type) { | |
1155 | case OVS_KEY_ATTR_PRIORITY: | |
1156 | *priority = nla_get_u32(nla); | |
1157 | break; | |
1158 | ||
1159 | case OVS_KEY_ATTR_IN_PORT: | |
1160 | if (nla_get_u32(nla) >= DP_MAX_PORTS) | |
1161 | return -EINVAL; | |
1162 | *in_port = nla_get_u32(nla); | |
1163 | break; | |
1164 | } | |
1165 | } | |
1166 | } | |
1167 | if (rem) | |
1168 | return -EINVAL; | |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) | |
1173 | { | |
1174 | struct ovs_key_ethernet *eth_key; | |
1175 | struct nlattr *nla, *encap; | |
1176 | ||
1177 | if (swkey->phy.priority) | |
1178 | NLA_PUT_U32(skb, OVS_KEY_ATTR_PRIORITY, swkey->phy.priority); | |
1179 | ||
1180 | if (swkey->phy.in_port != USHRT_MAX) | |
1181 | NLA_PUT_U32(skb, OVS_KEY_ATTR_IN_PORT, swkey->phy.in_port); | |
1182 | ||
1183 | nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key)); | |
1184 | if (!nla) | |
1185 | goto nla_put_failure; | |
1186 | eth_key = nla_data(nla); | |
1187 | memcpy(eth_key->eth_src, swkey->eth.src, ETH_ALEN); | |
1188 | memcpy(eth_key->eth_dst, swkey->eth.dst, ETH_ALEN); | |
1189 | ||
1190 | if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) { | |
1191 | NLA_PUT_BE16(skb, OVS_KEY_ATTR_ETHERTYPE, htons(ETH_P_8021Q)); | |
1192 | NLA_PUT_BE16(skb, OVS_KEY_ATTR_VLAN, swkey->eth.tci); | |
1193 | encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP); | |
1194 | if (!swkey->eth.tci) | |
1195 | goto unencap; | |
1196 | } else { | |
1197 | encap = NULL; | |
1198 | } | |
1199 | ||
1200 | if (swkey->eth.type == htons(ETH_P_802_2)) | |
1201 | goto unencap; | |
1202 | ||
1203 | NLA_PUT_BE16(skb, OVS_KEY_ATTR_ETHERTYPE, swkey->eth.type); | |
1204 | ||
1205 | if (swkey->eth.type == htons(ETH_P_IP)) { | |
1206 | struct ovs_key_ipv4 *ipv4_key; | |
1207 | ||
1208 | nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key)); | |
1209 | if (!nla) | |
1210 | goto nla_put_failure; | |
1211 | ipv4_key = nla_data(nla); | |
1212 | ipv4_key->ipv4_src = swkey->ipv4.addr.src; | |
1213 | ipv4_key->ipv4_dst = swkey->ipv4.addr.dst; | |
1214 | ipv4_key->ipv4_proto = swkey->ip.proto; | |
1215 | ipv4_key->ipv4_tos = swkey->ip.tos; | |
1216 | ipv4_key->ipv4_ttl = swkey->ip.ttl; | |
1217 | ipv4_key->ipv4_frag = swkey->ip.frag; | |
1218 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1219 | struct ovs_key_ipv6 *ipv6_key; | |
1220 | ||
1221 | nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key)); | |
1222 | if (!nla) | |
1223 | goto nla_put_failure; | |
1224 | ipv6_key = nla_data(nla); | |
1225 | memcpy(ipv6_key->ipv6_src, &swkey->ipv6.addr.src, | |
1226 | sizeof(ipv6_key->ipv6_src)); | |
1227 | memcpy(ipv6_key->ipv6_dst, &swkey->ipv6.addr.dst, | |
1228 | sizeof(ipv6_key->ipv6_dst)); | |
1229 | ipv6_key->ipv6_label = swkey->ipv6.label; | |
1230 | ipv6_key->ipv6_proto = swkey->ip.proto; | |
1231 | ipv6_key->ipv6_tclass = swkey->ip.tos; | |
1232 | ipv6_key->ipv6_hlimit = swkey->ip.ttl; | |
1233 | ipv6_key->ipv6_frag = swkey->ip.frag; | |
1234 | } else if (swkey->eth.type == htons(ETH_P_ARP)) { | |
1235 | struct ovs_key_arp *arp_key; | |
1236 | ||
1237 | nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key)); | |
1238 | if (!nla) | |
1239 | goto nla_put_failure; | |
1240 | arp_key = nla_data(nla); | |
1241 | memset(arp_key, 0, sizeof(struct ovs_key_arp)); | |
1242 | arp_key->arp_sip = swkey->ipv4.addr.src; | |
1243 | arp_key->arp_tip = swkey->ipv4.addr.dst; | |
1244 | arp_key->arp_op = htons(swkey->ip.proto); | |
1245 | memcpy(arp_key->arp_sha, swkey->ipv4.arp.sha, ETH_ALEN); | |
1246 | memcpy(arp_key->arp_tha, swkey->ipv4.arp.tha, ETH_ALEN); | |
1247 | } | |
1248 | ||
1249 | if ((swkey->eth.type == htons(ETH_P_IP) || | |
1250 | swkey->eth.type == htons(ETH_P_IPV6)) && | |
1251 | swkey->ip.frag != OVS_FRAG_TYPE_LATER) { | |
1252 | ||
1253 | if (swkey->ip.proto == IPPROTO_TCP) { | |
1254 | struct ovs_key_tcp *tcp_key; | |
1255 | ||
1256 | nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key)); | |
1257 | if (!nla) | |
1258 | goto nla_put_failure; | |
1259 | tcp_key = nla_data(nla); | |
1260 | if (swkey->eth.type == htons(ETH_P_IP)) { | |
1261 | tcp_key->tcp_src = swkey->ipv4.tp.src; | |
1262 | tcp_key->tcp_dst = swkey->ipv4.tp.dst; | |
1263 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1264 | tcp_key->tcp_src = swkey->ipv6.tp.src; | |
1265 | tcp_key->tcp_dst = swkey->ipv6.tp.dst; | |
1266 | } | |
1267 | } else if (swkey->ip.proto == IPPROTO_UDP) { | |
1268 | struct ovs_key_udp *udp_key; | |
1269 | ||
1270 | nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key)); | |
1271 | if (!nla) | |
1272 | goto nla_put_failure; | |
1273 | udp_key = nla_data(nla); | |
1274 | if (swkey->eth.type == htons(ETH_P_IP)) { | |
1275 | udp_key->udp_src = swkey->ipv4.tp.src; | |
1276 | udp_key->udp_dst = swkey->ipv4.tp.dst; | |
1277 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
1278 | udp_key->udp_src = swkey->ipv6.tp.src; | |
1279 | udp_key->udp_dst = swkey->ipv6.tp.dst; | |
1280 | } | |
1281 | } else if (swkey->eth.type == htons(ETH_P_IP) && | |
1282 | swkey->ip.proto == IPPROTO_ICMP) { | |
1283 | struct ovs_key_icmp *icmp_key; | |
1284 | ||
1285 | nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key)); | |
1286 | if (!nla) | |
1287 | goto nla_put_failure; | |
1288 | icmp_key = nla_data(nla); | |
1289 | icmp_key->icmp_type = ntohs(swkey->ipv4.tp.src); | |
1290 | icmp_key->icmp_code = ntohs(swkey->ipv4.tp.dst); | |
1291 | } else if (swkey->eth.type == htons(ETH_P_IPV6) && | |
1292 | swkey->ip.proto == IPPROTO_ICMPV6) { | |
1293 | struct ovs_key_icmpv6 *icmpv6_key; | |
1294 | ||
1295 | nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6, | |
1296 | sizeof(*icmpv6_key)); | |
1297 | if (!nla) | |
1298 | goto nla_put_failure; | |
1299 | icmpv6_key = nla_data(nla); | |
1300 | icmpv6_key->icmpv6_type = ntohs(swkey->ipv6.tp.src); | |
1301 | icmpv6_key->icmpv6_code = ntohs(swkey->ipv6.tp.dst); | |
1302 | ||
1303 | if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
1304 | icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) { | |
1305 | struct ovs_key_nd *nd_key; | |
1306 | ||
1307 | nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key)); | |
1308 | if (!nla) | |
1309 | goto nla_put_failure; | |
1310 | nd_key = nla_data(nla); | |
1311 | memcpy(nd_key->nd_target, &swkey->ipv6.nd.target, | |
1312 | sizeof(nd_key->nd_target)); | |
1313 | memcpy(nd_key->nd_sll, swkey->ipv6.nd.sll, ETH_ALEN); | |
1314 | memcpy(nd_key->nd_tll, swkey->ipv6.nd.tll, ETH_ALEN); | |
1315 | } | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | unencap: | |
1320 | if (encap) | |
1321 | nla_nest_end(skb, encap); | |
1322 | ||
1323 | return 0; | |
1324 | ||
1325 | nla_put_failure: | |
1326 | return -EMSGSIZE; | |
1327 | } | |
1328 | ||
1329 | /* Initializes the flow module. | |
1330 | * Returns zero if successful or a negative error code. */ | |
1331 | int ovs_flow_init(void) | |
1332 | { | |
1333 | flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0, | |
1334 | 0, NULL); | |
1335 | if (flow_cache == NULL) | |
1336 | return -ENOMEM; | |
1337 | ||
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /* Uninitializes the flow module. */ | |
1342 | void ovs_flow_exit(void) | |
1343 | { | |
1344 | kmem_cache_destroy(flow_cache); | |
1345 | } |