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ccb1352e | 1 | /* |
03f0d916 | 2 | * Copyright (c) 2007-2013 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> | |
a175a723 | 37 | #include <linux/sctp.h> |
e298e505 | 38 | #include <linux/smp.h> |
ccb1352e JG |
39 | #include <linux/tcp.h> |
40 | #include <linux/udp.h> | |
41 | #include <linux/icmp.h> | |
42 | #include <linux/icmpv6.h> | |
43 | #include <linux/rculist.h> | |
44 | #include <net/ip.h> | |
7d5437c7 | 45 | #include <net/ip_tunnels.h> |
ccb1352e JG |
46 | #include <net/ipv6.h> |
47 | #include <net/ndisc.h> | |
48 | ||
e6445719 | 49 | u64 ovs_flow_used_time(unsigned long flow_jiffies) |
03f0d916 | 50 | { |
e6445719 PS |
51 | struct timespec cur_ts; |
52 | u64 cur_ms, idle_ms; | |
03f0d916 | 53 | |
e6445719 PS |
54 | ktime_get_ts(&cur_ts); |
55 | idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); | |
56 | cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + | |
57 | cur_ts.tv_nsec / NSEC_PER_MSEC; | |
03f0d916 | 58 | |
e6445719 | 59 | return cur_ms - idle_ms; |
5828cd9a AZ |
60 | } |
61 | ||
df23e9f6 | 62 | #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF)) |
03f0d916 | 63 | |
e298e505 | 64 | void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb) |
03f0d916 | 65 | { |
e298e505 | 66 | struct flow_stats *stats; |
df23e9f6 | 67 | __be16 tcp_flags = 0; |
63e7959c | 68 | int node = numa_node_id(); |
03f0d916 | 69 | |
63e7959c | 70 | stats = rcu_dereference(flow->stats[node]); |
e298e505 | 71 | |
88d73f6c JR |
72 | if (likely(flow->key.ip.proto == IPPROTO_TCP)) { |
73 | if (likely(flow->key.eth.type == htons(ETH_P_IP))) | |
74 | tcp_flags = flow->key.ipv4.tp.flags; | |
75 | else if (likely(flow->key.eth.type == htons(ETH_P_IPV6))) | |
76 | tcp_flags = flow->key.ipv6.tp.flags; | |
03f0d916 | 77 | } |
63e7959c JR |
78 | /* Check if already have node-specific stats. */ |
79 | if (likely(stats)) { | |
80 | spin_lock(&stats->lock); | |
81 | /* Mark if we write on the pre-allocated stats. */ | |
82 | if (node == 0 && unlikely(flow->stats_last_writer != node)) | |
83 | flow->stats_last_writer = node; | |
84 | } else { | |
85 | stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */ | |
86 | spin_lock(&stats->lock); | |
87 | ||
88 | /* If the current NUMA-node is the only writer on the | |
89 | * pre-allocated stats keep using them. | |
90 | */ | |
91 | if (unlikely(flow->stats_last_writer != node)) { | |
92 | /* A previous locker may have already allocated the | |
93 | * stats, so we need to check again. If node-specific | |
94 | * stats were already allocated, we update the pre- | |
95 | * allocated stats as we have already locked them. | |
96 | */ | |
97 | if (likely(flow->stats_last_writer != NUMA_NO_NODE) | |
98 | && likely(!rcu_dereference(flow->stats[node]))) { | |
99 | /* Try to allocate node-specific stats. */ | |
100 | struct flow_stats *new_stats; | |
101 | ||
102 | new_stats = | |
103 | kmem_cache_alloc_node(flow_stats_cache, | |
104 | GFP_THISNODE | | |
105 | __GFP_NOMEMALLOC, | |
106 | node); | |
107 | if (likely(new_stats)) { | |
108 | new_stats->used = jiffies; | |
109 | new_stats->packet_count = 1; | |
110 | new_stats->byte_count = skb->len; | |
111 | new_stats->tcp_flags = tcp_flags; | |
112 | spin_lock_init(&new_stats->lock); | |
113 | ||
114 | rcu_assign_pointer(flow->stats[node], | |
115 | new_stats); | |
116 | goto unlock; | |
117 | } | |
118 | } | |
119 | flow->stats_last_writer = node; | |
120 | } | |
121 | } | |
122 | ||
e298e505 PS |
123 | stats->used = jiffies; |
124 | stats->packet_count++; | |
125 | stats->byte_count += skb->len; | |
126 | stats->tcp_flags |= tcp_flags; | |
63e7959c | 127 | unlock: |
e298e505 PS |
128 | spin_unlock(&stats->lock); |
129 | } | |
130 | ||
131 | void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats, | |
132 | unsigned long *used, __be16 *tcp_flags) | |
133 | { | |
63e7959c | 134 | int node; |
e298e505 PS |
135 | |
136 | *used = 0; | |
137 | *tcp_flags = 0; | |
138 | memset(ovs_stats, 0, sizeof(*ovs_stats)); | |
139 | ||
63e7959c JR |
140 | for_each_node(node) { |
141 | struct flow_stats *stats = rcu_dereference(flow->stats[node]); | |
142 | ||
143 | if (stats) { | |
144 | /* Local CPU may write on non-local stats, so we must | |
145 | * block bottom-halves here. | |
146 | */ | |
147 | spin_lock_bh(&stats->lock); | |
148 | if (!*used || time_after(stats->used, *used)) | |
149 | *used = stats->used; | |
150 | *tcp_flags |= stats->tcp_flags; | |
151 | ovs_stats->n_packets += stats->packet_count; | |
152 | ovs_stats->n_bytes += stats->byte_count; | |
153 | spin_unlock_bh(&stats->lock); | |
154 | } | |
e298e505 | 155 | } |
e298e505 PS |
156 | } |
157 | ||
158 | void ovs_flow_stats_clear(struct sw_flow *flow) | |
159 | { | |
63e7959c JR |
160 | int node; |
161 | ||
162 | for_each_node(node) { | |
163 | struct flow_stats *stats = rcu_dereference(flow->stats[node]); | |
164 | ||
165 | if (stats) { | |
166 | spin_lock_bh(&stats->lock); | |
167 | stats->used = 0; | |
168 | stats->packet_count = 0; | |
169 | stats->byte_count = 0; | |
170 | stats->tcp_flags = 0; | |
171 | spin_unlock_bh(&stats->lock); | |
172 | } | |
173 | } | |
03f0d916 AZ |
174 | } |
175 | ||
ccb1352e JG |
176 | static int check_header(struct sk_buff *skb, int len) |
177 | { | |
178 | if (unlikely(skb->len < len)) | |
179 | return -EINVAL; | |
180 | if (unlikely(!pskb_may_pull(skb, len))) | |
181 | return -ENOMEM; | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static bool arphdr_ok(struct sk_buff *skb) | |
186 | { | |
187 | return pskb_may_pull(skb, skb_network_offset(skb) + | |
188 | sizeof(struct arp_eth_header)); | |
189 | } | |
190 | ||
191 | static int check_iphdr(struct sk_buff *skb) | |
192 | { | |
193 | unsigned int nh_ofs = skb_network_offset(skb); | |
194 | unsigned int ip_len; | |
195 | int err; | |
196 | ||
197 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); | |
198 | if (unlikely(err)) | |
199 | return err; | |
200 | ||
201 | ip_len = ip_hdrlen(skb); | |
202 | if (unlikely(ip_len < sizeof(struct iphdr) || | |
203 | skb->len < nh_ofs + ip_len)) | |
204 | return -EINVAL; | |
205 | ||
206 | skb_set_transport_header(skb, nh_ofs + ip_len); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static bool tcphdr_ok(struct sk_buff *skb) | |
211 | { | |
212 | int th_ofs = skb_transport_offset(skb); | |
213 | int tcp_len; | |
214 | ||
215 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
216 | return false; | |
217 | ||
218 | tcp_len = tcp_hdrlen(skb); | |
219 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
220 | skb->len < th_ofs + tcp_len)) | |
221 | return false; | |
222 | ||
223 | return true; | |
224 | } | |
225 | ||
226 | static bool udphdr_ok(struct sk_buff *skb) | |
227 | { | |
228 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
229 | sizeof(struct udphdr)); | |
230 | } | |
231 | ||
a175a723 JS |
232 | static bool sctphdr_ok(struct sk_buff *skb) |
233 | { | |
234 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
235 | sizeof(struct sctphdr)); | |
236 | } | |
237 | ||
ccb1352e JG |
238 | static bool icmphdr_ok(struct sk_buff *skb) |
239 | { | |
240 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
241 | sizeof(struct icmphdr)); | |
242 | } | |
243 | ||
03f0d916 | 244 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e JG |
245 | { |
246 | unsigned int nh_ofs = skb_network_offset(skb); | |
247 | unsigned int nh_len; | |
248 | int payload_ofs; | |
249 | struct ipv6hdr *nh; | |
250 | uint8_t nexthdr; | |
251 | __be16 frag_off; | |
252 | int err; | |
253 | ||
ccb1352e JG |
254 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
255 | if (unlikely(err)) | |
256 | return err; | |
257 | ||
258 | nh = ipv6_hdr(skb); | |
259 | nexthdr = nh->nexthdr; | |
260 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
261 | ||
262 | key->ip.proto = NEXTHDR_NONE; | |
263 | key->ip.tos = ipv6_get_dsfield(nh); | |
264 | key->ip.ttl = nh->hop_limit; | |
265 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
266 | key->ipv6.addr.src = nh->saddr; | |
267 | key->ipv6.addr.dst = nh->daddr; | |
268 | ||
269 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); | |
270 | if (unlikely(payload_ofs < 0)) | |
271 | return -EINVAL; | |
272 | ||
273 | if (frag_off) { | |
274 | if (frag_off & htons(~0x7)) | |
275 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
276 | else | |
277 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
278 | } | |
279 | ||
280 | nh_len = payload_ofs - nh_ofs; | |
281 | skb_set_transport_header(skb, nh_ofs + nh_len); | |
282 | key->ip.proto = nexthdr; | |
283 | return nh_len; | |
284 | } | |
285 | ||
286 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
287 | { | |
288 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
289 | sizeof(struct icmp6hdr)); | |
290 | } | |
291 | ||
ccb1352e JG |
292 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
293 | { | |
294 | struct qtag_prefix { | |
295 | __be16 eth_type; /* ETH_P_8021Q */ | |
296 | __be16 tci; | |
297 | }; | |
298 | struct qtag_prefix *qp; | |
299 | ||
300 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) | |
301 | return 0; | |
302 | ||
303 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + | |
304 | sizeof(__be16)))) | |
305 | return -ENOMEM; | |
306 | ||
307 | qp = (struct qtag_prefix *) skb->data; | |
308 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); | |
309 | __skb_pull(skb, sizeof(struct qtag_prefix)); | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | static __be16 parse_ethertype(struct sk_buff *skb) | |
315 | { | |
316 | struct llc_snap_hdr { | |
317 | u8 dsap; /* Always 0xAA */ | |
318 | u8 ssap; /* Always 0xAA */ | |
319 | u8 ctrl; | |
320 | u8 oui[3]; | |
321 | __be16 ethertype; | |
322 | }; | |
323 | struct llc_snap_hdr *llc; | |
324 | __be16 proto; | |
325 | ||
326 | proto = *(__be16 *) skb->data; | |
327 | __skb_pull(skb, sizeof(__be16)); | |
328 | ||
e5c5d22e | 329 | if (ntohs(proto) >= ETH_P_802_3_MIN) |
ccb1352e JG |
330 | return proto; |
331 | ||
332 | if (skb->len < sizeof(struct llc_snap_hdr)) | |
333 | return htons(ETH_P_802_2); | |
334 | ||
335 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) | |
336 | return htons(0); | |
337 | ||
338 | llc = (struct llc_snap_hdr *) skb->data; | |
339 | if (llc->dsap != LLC_SAP_SNAP || | |
340 | llc->ssap != LLC_SAP_SNAP || | |
341 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
342 | return htons(ETH_P_802_2); | |
343 | ||
344 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
17b682a0 | 345 | |
e5c5d22e | 346 | if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN) |
17b682a0 RL |
347 | return llc->ethertype; |
348 | ||
349 | return htons(ETH_P_802_2); | |
ccb1352e JG |
350 | } |
351 | ||
352 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, | |
03f0d916 | 353 | int nh_len) |
ccb1352e JG |
354 | { |
355 | struct icmp6hdr *icmp = icmp6_hdr(skb); | |
ccb1352e JG |
356 | |
357 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
358 | * fields, so we need to store them in 16-bit network byte order. | |
359 | */ | |
360 | key->ipv6.tp.src = htons(icmp->icmp6_type); | |
361 | key->ipv6.tp.dst = htons(icmp->icmp6_code); | |
ccb1352e JG |
362 | |
363 | if (icmp->icmp6_code == 0 && | |
364 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
365 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
366 | int icmp_len = skb->len - skb_transport_offset(skb); | |
367 | struct nd_msg *nd; | |
368 | int offset; | |
369 | ||
ccb1352e JG |
370 | /* In order to process neighbor discovery options, we need the |
371 | * entire packet. | |
372 | */ | |
373 | if (unlikely(icmp_len < sizeof(*nd))) | |
03f0d916 AZ |
374 | return 0; |
375 | ||
376 | if (unlikely(skb_linearize(skb))) | |
377 | return -ENOMEM; | |
ccb1352e JG |
378 | |
379 | nd = (struct nd_msg *)skb_transport_header(skb); | |
380 | key->ipv6.nd.target = nd->target; | |
ccb1352e JG |
381 | |
382 | icmp_len -= sizeof(*nd); | |
383 | offset = 0; | |
384 | while (icmp_len >= 8) { | |
385 | struct nd_opt_hdr *nd_opt = | |
386 | (struct nd_opt_hdr *)(nd->opt + offset); | |
387 | int opt_len = nd_opt->nd_opt_len * 8; | |
388 | ||
389 | if (unlikely(!opt_len || opt_len > icmp_len)) | |
03f0d916 | 390 | return 0; |
ccb1352e JG |
391 | |
392 | /* Store the link layer address if the appropriate | |
393 | * option is provided. It is considered an error if | |
394 | * the same link layer option is specified twice. | |
395 | */ | |
396 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR | |
397 | && opt_len == 8) { | |
398 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) | |
399 | goto invalid; | |
8c63ff09 JP |
400 | ether_addr_copy(key->ipv6.nd.sll, |
401 | &nd->opt[offset+sizeof(*nd_opt)]); | |
ccb1352e JG |
402 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
403 | && opt_len == 8) { | |
404 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) | |
405 | goto invalid; | |
8c63ff09 JP |
406 | ether_addr_copy(key->ipv6.nd.tll, |
407 | &nd->opt[offset+sizeof(*nd_opt)]); | |
ccb1352e JG |
408 | } |
409 | ||
410 | icmp_len -= opt_len; | |
411 | offset += opt_len; | |
412 | } | |
413 | } | |
414 | ||
03f0d916 | 415 | return 0; |
ccb1352e JG |
416 | |
417 | invalid: | |
418 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); | |
419 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
420 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
421 | ||
03f0d916 | 422 | return 0; |
ccb1352e JG |
423 | } |
424 | ||
425 | /** | |
426 | * ovs_flow_extract - extracts a flow key from an Ethernet frame. | |
427 | * @skb: sk_buff that contains the frame, with skb->data pointing to the | |
428 | * Ethernet header | |
429 | * @in_port: port number on which @skb was received. | |
430 | * @key: output flow key | |
ccb1352e JG |
431 | * |
432 | * The caller must ensure that skb->len >= ETH_HLEN. | |
433 | * | |
434 | * Returns 0 if successful, otherwise a negative errno value. | |
435 | * | |
436 | * Initializes @skb header pointers as follows: | |
437 | * | |
438 | * - skb->mac_header: the Ethernet header. | |
439 | * | |
440 | * - skb->network_header: just past the Ethernet header, or just past the | |
441 | * VLAN header, to the first byte of the Ethernet payload. | |
442 | * | |
34d94f21 | 443 | * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 |
ccb1352e JG |
444 | * on output, then just past the IP header, if one is present and |
445 | * of a correct length, otherwise the same as skb->network_header. | |
34d94f21 | 446 | * For other key->eth.type values it is left untouched. |
ccb1352e | 447 | */ |
03f0d916 | 448 | int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key) |
ccb1352e | 449 | { |
03f0d916 | 450 | int error; |
ccb1352e JG |
451 | struct ethhdr *eth; |
452 | ||
453 | memset(key, 0, sizeof(*key)); | |
454 | ||
455 | key->phy.priority = skb->priority; | |
7d5437c7 PS |
456 | if (OVS_CB(skb)->tun_key) |
457 | memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key)); | |
ccb1352e | 458 | key->phy.in_port = in_port; |
39c7caeb | 459 | key->phy.skb_mark = skb->mark; |
ccb1352e JG |
460 | |
461 | skb_reset_mac_header(skb); | |
462 | ||
463 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet | |
464 | * header in the linear data area. | |
465 | */ | |
466 | eth = eth_hdr(skb); | |
8c63ff09 JP |
467 | ether_addr_copy(key->eth.src, eth->h_source); |
468 | ether_addr_copy(key->eth.dst, eth->h_dest); | |
ccb1352e JG |
469 | |
470 | __skb_pull(skb, 2 * ETH_ALEN); | |
b34df5e8 PS |
471 | /* We are going to push all headers that we pull, so no need to |
472 | * update skb->csum here. | |
473 | */ | |
ccb1352e JG |
474 | |
475 | if (vlan_tx_tag_present(skb)) | |
476 | key->eth.tci = htons(skb->vlan_tci); | |
477 | else if (eth->h_proto == htons(ETH_P_8021Q)) | |
478 | if (unlikely(parse_vlan(skb, key))) | |
479 | return -ENOMEM; | |
480 | ||
481 | key->eth.type = parse_ethertype(skb); | |
482 | if (unlikely(key->eth.type == htons(0))) | |
483 | return -ENOMEM; | |
484 | ||
485 | skb_reset_network_header(skb); | |
486 | __skb_push(skb, skb->data - skb_mac_header(skb)); | |
487 | ||
488 | /* Network layer. */ | |
489 | if (key->eth.type == htons(ETH_P_IP)) { | |
490 | struct iphdr *nh; | |
491 | __be16 offset; | |
492 | ||
ccb1352e JG |
493 | error = check_iphdr(skb); |
494 | if (unlikely(error)) { | |
495 | if (error == -EINVAL) { | |
496 | skb->transport_header = skb->network_header; | |
497 | error = 0; | |
498 | } | |
03f0d916 | 499 | return error; |
ccb1352e JG |
500 | } |
501 | ||
502 | nh = ip_hdr(skb); | |
503 | key->ipv4.addr.src = nh->saddr; | |
504 | key->ipv4.addr.dst = nh->daddr; | |
505 | ||
506 | key->ip.proto = nh->protocol; | |
507 | key->ip.tos = nh->tos; | |
508 | key->ip.ttl = nh->ttl; | |
509 | ||
510 | offset = nh->frag_off & htons(IP_OFFSET); | |
511 | if (offset) { | |
512 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
03f0d916 | 513 | return 0; |
ccb1352e JG |
514 | } |
515 | if (nh->frag_off & htons(IP_MF) || | |
516 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
517 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
518 | ||
519 | /* Transport layer. */ | |
520 | if (key->ip.proto == IPPROTO_TCP) { | |
ccb1352e JG |
521 | if (tcphdr_ok(skb)) { |
522 | struct tcphdr *tcp = tcp_hdr(skb); | |
523 | key->ipv4.tp.src = tcp->source; | |
524 | key->ipv4.tp.dst = tcp->dest; | |
5eb26b15 | 525 | key->ipv4.tp.flags = TCP_FLAGS_BE16(tcp); |
ccb1352e JG |
526 | } |
527 | } else if (key->ip.proto == IPPROTO_UDP) { | |
ccb1352e JG |
528 | if (udphdr_ok(skb)) { |
529 | struct udphdr *udp = udp_hdr(skb); | |
530 | key->ipv4.tp.src = udp->source; | |
531 | key->ipv4.tp.dst = udp->dest; | |
532 | } | |
a175a723 JS |
533 | } else if (key->ip.proto == IPPROTO_SCTP) { |
534 | if (sctphdr_ok(skb)) { | |
535 | struct sctphdr *sctp = sctp_hdr(skb); | |
536 | key->ipv4.tp.src = sctp->source; | |
537 | key->ipv4.tp.dst = sctp->dest; | |
538 | } | |
ccb1352e | 539 | } else if (key->ip.proto == IPPROTO_ICMP) { |
ccb1352e JG |
540 | if (icmphdr_ok(skb)) { |
541 | struct icmphdr *icmp = icmp_hdr(skb); | |
542 | /* The ICMP type and code fields use the 16-bit | |
543 | * transport port fields, so we need to store | |
544 | * them in 16-bit network byte order. */ | |
545 | key->ipv4.tp.src = htons(icmp->type); | |
546 | key->ipv4.tp.dst = htons(icmp->code); | |
547 | } | |
548 | } | |
549 | ||
c0618533 MM |
550 | } else if ((key->eth.type == htons(ETH_P_ARP) || |
551 | key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) { | |
ccb1352e JG |
552 | struct arp_eth_header *arp; |
553 | ||
554 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
555 | ||
556 | if (arp->ar_hrd == htons(ARPHRD_ETHER) | |
557 | && arp->ar_pro == htons(ETH_P_IP) | |
558 | && arp->ar_hln == ETH_ALEN | |
559 | && arp->ar_pln == 4) { | |
560 | ||
561 | /* We only match on the lower 8 bits of the opcode. */ | |
562 | if (ntohs(arp->ar_op) <= 0xff) | |
563 | key->ip.proto = ntohs(arp->ar_op); | |
d04d3829 MM |
564 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
565 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
8c63ff09 JP |
566 | ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); |
567 | ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); | |
ccb1352e JG |
568 | } |
569 | } else if (key->eth.type == htons(ETH_P_IPV6)) { | |
570 | int nh_len; /* IPv6 Header + Extensions */ | |
571 | ||
03f0d916 | 572 | nh_len = parse_ipv6hdr(skb, key); |
ccb1352e | 573 | if (unlikely(nh_len < 0)) { |
03f0d916 | 574 | if (nh_len == -EINVAL) { |
ccb1352e | 575 | skb->transport_header = skb->network_header; |
03f0d916 AZ |
576 | error = 0; |
577 | } else { | |
ccb1352e | 578 | error = nh_len; |
03f0d916 AZ |
579 | } |
580 | return error; | |
ccb1352e JG |
581 | } |
582 | ||
583 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) | |
03f0d916 | 584 | return 0; |
ccb1352e JG |
585 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
586 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
587 | ||
588 | /* Transport layer. */ | |
589 | if (key->ip.proto == NEXTHDR_TCP) { | |
ccb1352e JG |
590 | if (tcphdr_ok(skb)) { |
591 | struct tcphdr *tcp = tcp_hdr(skb); | |
592 | key->ipv6.tp.src = tcp->source; | |
593 | key->ipv6.tp.dst = tcp->dest; | |
5eb26b15 | 594 | key->ipv6.tp.flags = TCP_FLAGS_BE16(tcp); |
ccb1352e JG |
595 | } |
596 | } else if (key->ip.proto == NEXTHDR_UDP) { | |
ccb1352e JG |
597 | if (udphdr_ok(skb)) { |
598 | struct udphdr *udp = udp_hdr(skb); | |
599 | key->ipv6.tp.src = udp->source; | |
600 | key->ipv6.tp.dst = udp->dest; | |
601 | } | |
a175a723 JS |
602 | } else if (key->ip.proto == NEXTHDR_SCTP) { |
603 | if (sctphdr_ok(skb)) { | |
604 | struct sctphdr *sctp = sctp_hdr(skb); | |
605 | key->ipv6.tp.src = sctp->source; | |
606 | key->ipv6.tp.dst = sctp->dest; | |
607 | } | |
ccb1352e | 608 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
ccb1352e | 609 | if (icmp6hdr_ok(skb)) { |
03f0d916 AZ |
610 | error = parse_icmpv6(skb, key, nh_len); |
611 | if (error) | |
612 | return error; | |
ccb1352e JG |
613 | } |
614 | } | |
615 | } | |
616 | ||
03f0d916 | 617 | return 0; |
ccb1352e | 618 | } |