Commit | Line | Data |
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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; |
1139e241 | 67 | __be16 tcp_flags = flow->key.tp.flags; |
63e7959c | 68 | int node = numa_node_id(); |
03f0d916 | 69 | |
63e7959c | 70 | stats = rcu_dereference(flow->stats[node]); |
e298e505 | 71 | |
63e7959c JR |
72 | /* Check if already have node-specific stats. */ |
73 | if (likely(stats)) { | |
74 | spin_lock(&stats->lock); | |
75 | /* Mark if we write on the pre-allocated stats. */ | |
76 | if (node == 0 && unlikely(flow->stats_last_writer != node)) | |
77 | flow->stats_last_writer = node; | |
78 | } else { | |
79 | stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */ | |
80 | spin_lock(&stats->lock); | |
81 | ||
82 | /* If the current NUMA-node is the only writer on the | |
83 | * pre-allocated stats keep using them. | |
84 | */ | |
85 | if (unlikely(flow->stats_last_writer != node)) { | |
86 | /* A previous locker may have already allocated the | |
87 | * stats, so we need to check again. If node-specific | |
88 | * stats were already allocated, we update the pre- | |
89 | * allocated stats as we have already locked them. | |
90 | */ | |
91 | if (likely(flow->stats_last_writer != NUMA_NO_NODE) | |
92 | && likely(!rcu_dereference(flow->stats[node]))) { | |
93 | /* Try to allocate node-specific stats. */ | |
94 | struct flow_stats *new_stats; | |
95 | ||
96 | new_stats = | |
97 | kmem_cache_alloc_node(flow_stats_cache, | |
98 | GFP_THISNODE | | |
99 | __GFP_NOMEMALLOC, | |
100 | node); | |
101 | if (likely(new_stats)) { | |
102 | new_stats->used = jiffies; | |
103 | new_stats->packet_count = 1; | |
104 | new_stats->byte_count = skb->len; | |
105 | new_stats->tcp_flags = tcp_flags; | |
106 | spin_lock_init(&new_stats->lock); | |
107 | ||
108 | rcu_assign_pointer(flow->stats[node], | |
109 | new_stats); | |
110 | goto unlock; | |
111 | } | |
112 | } | |
113 | flow->stats_last_writer = node; | |
114 | } | |
115 | } | |
116 | ||
e298e505 PS |
117 | stats->used = jiffies; |
118 | stats->packet_count++; | |
119 | stats->byte_count += skb->len; | |
120 | stats->tcp_flags |= tcp_flags; | |
63e7959c | 121 | unlock: |
e298e505 PS |
122 | spin_unlock(&stats->lock); |
123 | } | |
124 | ||
86ec8dba JR |
125 | /* Must be called with rcu_read_lock or ovs_mutex. */ |
126 | void ovs_flow_stats_get(const struct sw_flow *flow, | |
127 | struct ovs_flow_stats *ovs_stats, | |
e298e505 PS |
128 | unsigned long *used, __be16 *tcp_flags) |
129 | { | |
63e7959c | 130 | int node; |
e298e505 PS |
131 | |
132 | *used = 0; | |
133 | *tcp_flags = 0; | |
134 | memset(ovs_stats, 0, sizeof(*ovs_stats)); | |
135 | ||
63e7959c | 136 | for_each_node(node) { |
86ec8dba | 137 | struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]); |
63e7959c JR |
138 | |
139 | if (stats) { | |
140 | /* Local CPU may write on non-local stats, so we must | |
141 | * block bottom-halves here. | |
142 | */ | |
143 | spin_lock_bh(&stats->lock); | |
144 | if (!*used || time_after(stats->used, *used)) | |
145 | *used = stats->used; | |
146 | *tcp_flags |= stats->tcp_flags; | |
147 | ovs_stats->n_packets += stats->packet_count; | |
148 | ovs_stats->n_bytes += stats->byte_count; | |
149 | spin_unlock_bh(&stats->lock); | |
150 | } | |
e298e505 | 151 | } |
e298e505 PS |
152 | } |
153 | ||
86ec8dba | 154 | /* Called with ovs_mutex. */ |
e298e505 PS |
155 | void ovs_flow_stats_clear(struct sw_flow *flow) |
156 | { | |
63e7959c JR |
157 | int node; |
158 | ||
159 | for_each_node(node) { | |
86ec8dba | 160 | struct flow_stats *stats = ovsl_dereference(flow->stats[node]); |
63e7959c JR |
161 | |
162 | if (stats) { | |
163 | spin_lock_bh(&stats->lock); | |
164 | stats->used = 0; | |
165 | stats->packet_count = 0; | |
166 | stats->byte_count = 0; | |
167 | stats->tcp_flags = 0; | |
168 | spin_unlock_bh(&stats->lock); | |
169 | } | |
170 | } | |
03f0d916 AZ |
171 | } |
172 | ||
ccb1352e JG |
173 | static int check_header(struct sk_buff *skb, int len) |
174 | { | |
175 | if (unlikely(skb->len < len)) | |
176 | return -EINVAL; | |
177 | if (unlikely(!pskb_may_pull(skb, len))) | |
178 | return -ENOMEM; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static bool arphdr_ok(struct sk_buff *skb) | |
183 | { | |
184 | return pskb_may_pull(skb, skb_network_offset(skb) + | |
185 | sizeof(struct arp_eth_header)); | |
186 | } | |
187 | ||
188 | static int check_iphdr(struct sk_buff *skb) | |
189 | { | |
190 | unsigned int nh_ofs = skb_network_offset(skb); | |
191 | unsigned int ip_len; | |
192 | int err; | |
193 | ||
194 | err = check_header(skb, nh_ofs + sizeof(struct iphdr)); | |
195 | if (unlikely(err)) | |
196 | return err; | |
197 | ||
198 | ip_len = ip_hdrlen(skb); | |
199 | if (unlikely(ip_len < sizeof(struct iphdr) || | |
200 | skb->len < nh_ofs + ip_len)) | |
201 | return -EINVAL; | |
202 | ||
203 | skb_set_transport_header(skb, nh_ofs + ip_len); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static bool tcphdr_ok(struct sk_buff *skb) | |
208 | { | |
209 | int th_ofs = skb_transport_offset(skb); | |
210 | int tcp_len; | |
211 | ||
212 | if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr)))) | |
213 | return false; | |
214 | ||
215 | tcp_len = tcp_hdrlen(skb); | |
216 | if (unlikely(tcp_len < sizeof(struct tcphdr) || | |
217 | skb->len < th_ofs + tcp_len)) | |
218 | return false; | |
219 | ||
220 | return true; | |
221 | } | |
222 | ||
223 | static bool udphdr_ok(struct sk_buff *skb) | |
224 | { | |
225 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
226 | sizeof(struct udphdr)); | |
227 | } | |
228 | ||
a175a723 JS |
229 | static bool sctphdr_ok(struct sk_buff *skb) |
230 | { | |
231 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
232 | sizeof(struct sctphdr)); | |
233 | } | |
234 | ||
ccb1352e JG |
235 | static bool icmphdr_ok(struct sk_buff *skb) |
236 | { | |
237 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
238 | sizeof(struct icmphdr)); | |
239 | } | |
240 | ||
03f0d916 | 241 | static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e JG |
242 | { |
243 | unsigned int nh_ofs = skb_network_offset(skb); | |
244 | unsigned int nh_len; | |
245 | int payload_ofs; | |
246 | struct ipv6hdr *nh; | |
247 | uint8_t nexthdr; | |
248 | __be16 frag_off; | |
249 | int err; | |
250 | ||
ccb1352e JG |
251 | err = check_header(skb, nh_ofs + sizeof(*nh)); |
252 | if (unlikely(err)) | |
253 | return err; | |
254 | ||
255 | nh = ipv6_hdr(skb); | |
256 | nexthdr = nh->nexthdr; | |
257 | payload_ofs = (u8 *)(nh + 1) - skb->data; | |
258 | ||
259 | key->ip.proto = NEXTHDR_NONE; | |
260 | key->ip.tos = ipv6_get_dsfield(nh); | |
261 | key->ip.ttl = nh->hop_limit; | |
262 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
263 | key->ipv6.addr.src = nh->saddr; | |
264 | key->ipv6.addr.dst = nh->daddr; | |
265 | ||
266 | payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off); | |
267 | if (unlikely(payload_ofs < 0)) | |
268 | return -EINVAL; | |
269 | ||
270 | if (frag_off) { | |
271 | if (frag_off & htons(~0x7)) | |
272 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
273 | else | |
274 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
275 | } | |
276 | ||
277 | nh_len = payload_ofs - nh_ofs; | |
278 | skb_set_transport_header(skb, nh_ofs + nh_len); | |
279 | key->ip.proto = nexthdr; | |
280 | return nh_len; | |
281 | } | |
282 | ||
283 | static bool icmp6hdr_ok(struct sk_buff *skb) | |
284 | { | |
285 | return pskb_may_pull(skb, skb_transport_offset(skb) + | |
286 | sizeof(struct icmp6hdr)); | |
287 | } | |
288 | ||
ccb1352e JG |
289 | static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
290 | { | |
291 | struct qtag_prefix { | |
292 | __be16 eth_type; /* ETH_P_8021Q */ | |
293 | __be16 tci; | |
294 | }; | |
295 | struct qtag_prefix *qp; | |
296 | ||
297 | if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16))) | |
298 | return 0; | |
299 | ||
300 | if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) + | |
301 | sizeof(__be16)))) | |
302 | return -ENOMEM; | |
303 | ||
304 | qp = (struct qtag_prefix *) skb->data; | |
305 | key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT); | |
306 | __skb_pull(skb, sizeof(struct qtag_prefix)); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static __be16 parse_ethertype(struct sk_buff *skb) | |
312 | { | |
313 | struct llc_snap_hdr { | |
314 | u8 dsap; /* Always 0xAA */ | |
315 | u8 ssap; /* Always 0xAA */ | |
316 | u8 ctrl; | |
317 | u8 oui[3]; | |
318 | __be16 ethertype; | |
319 | }; | |
320 | struct llc_snap_hdr *llc; | |
321 | __be16 proto; | |
322 | ||
323 | proto = *(__be16 *) skb->data; | |
324 | __skb_pull(skb, sizeof(__be16)); | |
325 | ||
e5c5d22e | 326 | if (ntohs(proto) >= ETH_P_802_3_MIN) |
ccb1352e JG |
327 | return proto; |
328 | ||
329 | if (skb->len < sizeof(struct llc_snap_hdr)) | |
330 | return htons(ETH_P_802_2); | |
331 | ||
332 | if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr)))) | |
333 | return htons(0); | |
334 | ||
335 | llc = (struct llc_snap_hdr *) skb->data; | |
336 | if (llc->dsap != LLC_SAP_SNAP || | |
337 | llc->ssap != LLC_SAP_SNAP || | |
338 | (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0) | |
339 | return htons(ETH_P_802_2); | |
340 | ||
341 | __skb_pull(skb, sizeof(struct llc_snap_hdr)); | |
17b682a0 | 342 | |
e5c5d22e | 343 | if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN) |
17b682a0 RL |
344 | return llc->ethertype; |
345 | ||
346 | return htons(ETH_P_802_2); | |
ccb1352e JG |
347 | } |
348 | ||
349 | static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, | |
03f0d916 | 350 | int nh_len) |
ccb1352e JG |
351 | { |
352 | struct icmp6hdr *icmp = icmp6_hdr(skb); | |
ccb1352e JG |
353 | |
354 | /* The ICMPv6 type and code fields use the 16-bit transport port | |
355 | * fields, so we need to store them in 16-bit network byte order. | |
356 | */ | |
1139e241 JR |
357 | key->tp.src = htons(icmp->icmp6_type); |
358 | key->tp.dst = htons(icmp->icmp6_code); | |
ccb1352e JG |
359 | |
360 | if (icmp->icmp6_code == 0 && | |
361 | (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || | |
362 | icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) { | |
363 | int icmp_len = skb->len - skb_transport_offset(skb); | |
364 | struct nd_msg *nd; | |
365 | int offset; | |
366 | ||
ccb1352e JG |
367 | /* In order to process neighbor discovery options, we need the |
368 | * entire packet. | |
369 | */ | |
370 | if (unlikely(icmp_len < sizeof(*nd))) | |
03f0d916 AZ |
371 | return 0; |
372 | ||
373 | if (unlikely(skb_linearize(skb))) | |
374 | return -ENOMEM; | |
ccb1352e JG |
375 | |
376 | nd = (struct nd_msg *)skb_transport_header(skb); | |
377 | key->ipv6.nd.target = nd->target; | |
ccb1352e JG |
378 | |
379 | icmp_len -= sizeof(*nd); | |
380 | offset = 0; | |
381 | while (icmp_len >= 8) { | |
382 | struct nd_opt_hdr *nd_opt = | |
383 | (struct nd_opt_hdr *)(nd->opt + offset); | |
384 | int opt_len = nd_opt->nd_opt_len * 8; | |
385 | ||
386 | if (unlikely(!opt_len || opt_len > icmp_len)) | |
03f0d916 | 387 | return 0; |
ccb1352e JG |
388 | |
389 | /* Store the link layer address if the appropriate | |
390 | * option is provided. It is considered an error if | |
391 | * the same link layer option is specified twice. | |
392 | */ | |
393 | if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR | |
394 | && opt_len == 8) { | |
395 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll))) | |
396 | goto invalid; | |
8c63ff09 JP |
397 | ether_addr_copy(key->ipv6.nd.sll, |
398 | &nd->opt[offset+sizeof(*nd_opt)]); | |
ccb1352e JG |
399 | } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR |
400 | && opt_len == 8) { | |
401 | if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll))) | |
402 | goto invalid; | |
8c63ff09 JP |
403 | ether_addr_copy(key->ipv6.nd.tll, |
404 | &nd->opt[offset+sizeof(*nd_opt)]); | |
ccb1352e JG |
405 | } |
406 | ||
407 | icmp_len -= opt_len; | |
408 | offset += opt_len; | |
409 | } | |
410 | } | |
411 | ||
03f0d916 | 412 | return 0; |
ccb1352e JG |
413 | |
414 | invalid: | |
415 | memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); | |
416 | memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); | |
417 | memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); | |
418 | ||
03f0d916 | 419 | return 0; |
ccb1352e JG |
420 | } |
421 | ||
422 | /** | |
423 | * ovs_flow_extract - extracts a flow key from an Ethernet frame. | |
424 | * @skb: sk_buff that contains the frame, with skb->data pointing to the | |
425 | * Ethernet header | |
426 | * @in_port: port number on which @skb was received. | |
427 | * @key: output flow key | |
ccb1352e JG |
428 | * |
429 | * The caller must ensure that skb->len >= ETH_HLEN. | |
430 | * | |
431 | * Returns 0 if successful, otherwise a negative errno value. | |
432 | * | |
433 | * Initializes @skb header pointers as follows: | |
434 | * | |
435 | * - skb->mac_header: the Ethernet header. | |
436 | * | |
437 | * - skb->network_header: just past the Ethernet header, or just past the | |
438 | * VLAN header, to the first byte of the Ethernet payload. | |
439 | * | |
34d94f21 | 440 | * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6 |
ccb1352e JG |
441 | * on output, then just past the IP header, if one is present and |
442 | * of a correct length, otherwise the same as skb->network_header. | |
34d94f21 | 443 | * For other key->eth.type values it is left untouched. |
ccb1352e | 444 | */ |
03f0d916 | 445 | int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key) |
ccb1352e | 446 | { |
03f0d916 | 447 | int error; |
ccb1352e JG |
448 | struct ethhdr *eth; |
449 | ||
450 | memset(key, 0, sizeof(*key)); | |
451 | ||
452 | key->phy.priority = skb->priority; | |
7d5437c7 PS |
453 | if (OVS_CB(skb)->tun_key) |
454 | memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key)); | |
ccb1352e | 455 | key->phy.in_port = in_port; |
39c7caeb | 456 | key->phy.skb_mark = skb->mark; |
ccb1352e JG |
457 | |
458 | skb_reset_mac_header(skb); | |
459 | ||
460 | /* Link layer. We are guaranteed to have at least the 14 byte Ethernet | |
461 | * header in the linear data area. | |
462 | */ | |
463 | eth = eth_hdr(skb); | |
8c63ff09 JP |
464 | ether_addr_copy(key->eth.src, eth->h_source); |
465 | ether_addr_copy(key->eth.dst, eth->h_dest); | |
ccb1352e JG |
466 | |
467 | __skb_pull(skb, 2 * ETH_ALEN); | |
b34df5e8 PS |
468 | /* We are going to push all headers that we pull, so no need to |
469 | * update skb->csum here. | |
470 | */ | |
ccb1352e JG |
471 | |
472 | if (vlan_tx_tag_present(skb)) | |
473 | key->eth.tci = htons(skb->vlan_tci); | |
474 | else if (eth->h_proto == htons(ETH_P_8021Q)) | |
475 | if (unlikely(parse_vlan(skb, key))) | |
476 | return -ENOMEM; | |
477 | ||
478 | key->eth.type = parse_ethertype(skb); | |
479 | if (unlikely(key->eth.type == htons(0))) | |
480 | return -ENOMEM; | |
481 | ||
482 | skb_reset_network_header(skb); | |
483 | __skb_push(skb, skb->data - skb_mac_header(skb)); | |
484 | ||
485 | /* Network layer. */ | |
486 | if (key->eth.type == htons(ETH_P_IP)) { | |
487 | struct iphdr *nh; | |
488 | __be16 offset; | |
489 | ||
ccb1352e JG |
490 | error = check_iphdr(skb); |
491 | if (unlikely(error)) { | |
492 | if (error == -EINVAL) { | |
493 | skb->transport_header = skb->network_header; | |
494 | error = 0; | |
495 | } | |
03f0d916 | 496 | return error; |
ccb1352e JG |
497 | } |
498 | ||
499 | nh = ip_hdr(skb); | |
500 | key->ipv4.addr.src = nh->saddr; | |
501 | key->ipv4.addr.dst = nh->daddr; | |
502 | ||
503 | key->ip.proto = nh->protocol; | |
504 | key->ip.tos = nh->tos; | |
505 | key->ip.ttl = nh->ttl; | |
506 | ||
507 | offset = nh->frag_off & htons(IP_OFFSET); | |
508 | if (offset) { | |
509 | key->ip.frag = OVS_FRAG_TYPE_LATER; | |
03f0d916 | 510 | return 0; |
ccb1352e JG |
511 | } |
512 | if (nh->frag_off & htons(IP_MF) || | |
513 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
514 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
515 | ||
516 | /* Transport layer. */ | |
517 | if (key->ip.proto == IPPROTO_TCP) { | |
ccb1352e JG |
518 | if (tcphdr_ok(skb)) { |
519 | struct tcphdr *tcp = tcp_hdr(skb); | |
1139e241 JR |
520 | key->tp.src = tcp->source; |
521 | key->tp.dst = tcp->dest; | |
522 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
ccb1352e JG |
523 | } |
524 | } else if (key->ip.proto == IPPROTO_UDP) { | |
ccb1352e JG |
525 | if (udphdr_ok(skb)) { |
526 | struct udphdr *udp = udp_hdr(skb); | |
1139e241 JR |
527 | key->tp.src = udp->source; |
528 | key->tp.dst = udp->dest; | |
ccb1352e | 529 | } |
a175a723 JS |
530 | } else if (key->ip.proto == IPPROTO_SCTP) { |
531 | if (sctphdr_ok(skb)) { | |
532 | struct sctphdr *sctp = sctp_hdr(skb); | |
1139e241 JR |
533 | key->tp.src = sctp->source; |
534 | key->tp.dst = sctp->dest; | |
a175a723 | 535 | } |
ccb1352e | 536 | } else if (key->ip.proto == IPPROTO_ICMP) { |
ccb1352e JG |
537 | if (icmphdr_ok(skb)) { |
538 | struct icmphdr *icmp = icmp_hdr(skb); | |
539 | /* The ICMP type and code fields use the 16-bit | |
540 | * transport port fields, so we need to store | |
541 | * them in 16-bit network byte order. */ | |
1139e241 JR |
542 | key->tp.src = htons(icmp->type); |
543 | key->tp.dst = htons(icmp->code); | |
ccb1352e JG |
544 | } |
545 | } | |
546 | ||
c0618533 MM |
547 | } else if ((key->eth.type == htons(ETH_P_ARP) || |
548 | key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) { | |
ccb1352e JG |
549 | struct arp_eth_header *arp; |
550 | ||
551 | arp = (struct arp_eth_header *)skb_network_header(skb); | |
552 | ||
553 | if (arp->ar_hrd == htons(ARPHRD_ETHER) | |
554 | && arp->ar_pro == htons(ETH_P_IP) | |
555 | && arp->ar_hln == ETH_ALEN | |
556 | && arp->ar_pln == 4) { | |
557 | ||
558 | /* We only match on the lower 8 bits of the opcode. */ | |
559 | if (ntohs(arp->ar_op) <= 0xff) | |
560 | key->ip.proto = ntohs(arp->ar_op); | |
d04d3829 MM |
561 | memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src)); |
562 | memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); | |
8c63ff09 JP |
563 | ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha); |
564 | ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha); | |
ccb1352e JG |
565 | } |
566 | } else if (key->eth.type == htons(ETH_P_IPV6)) { | |
567 | int nh_len; /* IPv6 Header + Extensions */ | |
568 | ||
03f0d916 | 569 | nh_len = parse_ipv6hdr(skb, key); |
ccb1352e | 570 | if (unlikely(nh_len < 0)) { |
03f0d916 | 571 | if (nh_len == -EINVAL) { |
ccb1352e | 572 | skb->transport_header = skb->network_header; |
03f0d916 AZ |
573 | error = 0; |
574 | } else { | |
ccb1352e | 575 | error = nh_len; |
03f0d916 AZ |
576 | } |
577 | return error; | |
ccb1352e JG |
578 | } |
579 | ||
580 | if (key->ip.frag == OVS_FRAG_TYPE_LATER) | |
03f0d916 | 581 | return 0; |
ccb1352e JG |
582 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
583 | key->ip.frag = OVS_FRAG_TYPE_FIRST; | |
584 | ||
585 | /* Transport layer. */ | |
586 | if (key->ip.proto == NEXTHDR_TCP) { | |
ccb1352e JG |
587 | if (tcphdr_ok(skb)) { |
588 | struct tcphdr *tcp = tcp_hdr(skb); | |
1139e241 JR |
589 | key->tp.src = tcp->source; |
590 | key->tp.dst = tcp->dest; | |
591 | key->tp.flags = TCP_FLAGS_BE16(tcp); | |
ccb1352e JG |
592 | } |
593 | } else if (key->ip.proto == NEXTHDR_UDP) { | |
ccb1352e JG |
594 | if (udphdr_ok(skb)) { |
595 | struct udphdr *udp = udp_hdr(skb); | |
1139e241 JR |
596 | key->tp.src = udp->source; |
597 | key->tp.dst = udp->dest; | |
ccb1352e | 598 | } |
a175a723 JS |
599 | } else if (key->ip.proto == NEXTHDR_SCTP) { |
600 | if (sctphdr_ok(skb)) { | |
601 | struct sctphdr *sctp = sctp_hdr(skb); | |
1139e241 JR |
602 | key->tp.src = sctp->source; |
603 | key->tp.dst = sctp->dest; | |
a175a723 | 604 | } |
ccb1352e | 605 | } else if (key->ip.proto == NEXTHDR_ICMP) { |
ccb1352e | 606 | if (icmp6hdr_ok(skb)) { |
03f0d916 AZ |
607 | error = parse_icmpv6(skb, key, nh_len); |
608 | if (error) | |
609 | return error; | |
ccb1352e JG |
610 | } |
611 | } | |
612 | } | |
613 | ||
03f0d916 | 614 | return 0; |
ccb1352e | 615 | } |