blob: 2998989e76db0a7ccb8e25ef11aa393180956593 [file] [log] [blame]
Jesse Grossccb13522011-10-25 19:26:31 -07001/*
Andy Zhou03f0d912013-08-07 20:01:00 -07002 * Copyright (c) 2007-2013 Nicira, Inc.
Jesse Grossccb13522011-10-25 19:26:31 -07003 *
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>
Jesse Grossccb13522011-10-25 19:26:31 -070035#include <linux/ip.h>
36#include <linux/ipv6.h>
Joe Stringera175a722013-08-22 12:30:48 -070037#include <linux/sctp.h>
Pravin B Shelare298e502013-10-29 17:22:21 -070038#include <linux/smp.h>
Jesse Grossccb13522011-10-25 19:26:31 -070039#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>
Pravin B Shelar7d5437c2013-06-17 17:50:18 -070045#include <net/ip_tunnels.h>
Jesse Grossccb13522011-10-25 19:26:31 -070046#include <net/ipv6.h>
47#include <net/ndisc.h>
48
Pravin B Shelare6445712013-10-03 18:16:47 -070049u64 ovs_flow_used_time(unsigned long flow_jiffies)
Andy Zhou03f0d912013-08-07 20:01:00 -070050{
Pravin B Shelare6445712013-10-03 18:16:47 -070051 struct timespec cur_ts;
52 u64 cur_ms, idle_ms;
Andy Zhou03f0d912013-08-07 20:01:00 -070053
Pravin B Shelare6445712013-10-03 18:16:47 -070054 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;
Andy Zhou03f0d912013-08-07 20:01:00 -070058
Pravin B Shelare6445712013-10-03 18:16:47 -070059 return cur_ms - idle_ms;
Andy Zhou03f0d912013-08-07 20:01:00 -070060}
61
Jarno Rajahalmedf23e9f2013-10-23 01:40:44 -070062#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
Andy Zhou03f0d912013-08-07 20:01:00 -070063
Pravin B Shelare298e502013-10-29 17:22:21 -070064void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
Andy Zhou5828cd92013-08-27 13:02:21 -070065{
Pravin B Shelare298e502013-10-29 17:22:21 -070066 struct flow_stats *stats;
Jarno Rajahalmedf23e9f2013-10-23 01:40:44 -070067 __be16 tcp_flags = 0;
Andy Zhou5828cd92013-08-27 13:02:21 -070068
Pravin B Shelare298e502013-10-29 17:22:21 -070069 if (!flow->stats.is_percpu)
70 stats = flow->stats.stat;
71 else
72 stats = this_cpu_ptr(flow->stats.cpu_stats);
73
Pravin B Shelare6445712013-10-03 18:16:47 -070074 if ((flow->key.eth.type == htons(ETH_P_IP) ||
75 flow->key.eth.type == htons(ETH_P_IPV6)) &&
Jarno Rajahalme04382a32014-02-15 17:37:45 -080076 flow->key.ip.frag != OVS_FRAG_TYPE_LATER &&
Pravin B Shelare6445712013-10-03 18:16:47 -070077 flow->key.ip.proto == IPPROTO_TCP &&
78 likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
Jarno Rajahalmedf23e9f2013-10-23 01:40:44 -070079 tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
Andy Zhou03f0d912013-08-07 20:01:00 -070080 }
81
Pravin B Shelare298e502013-10-29 17:22:21 -070082 spin_lock(&stats->lock);
83 stats->used = jiffies;
84 stats->packet_count++;
85 stats->byte_count += skb->len;
86 stats->tcp_flags |= tcp_flags;
87 spin_unlock(&stats->lock);
88}
89
90static void stats_read(struct flow_stats *stats,
91 struct ovs_flow_stats *ovs_stats,
92 unsigned long *used, __be16 *tcp_flags)
93{
94 spin_lock(&stats->lock);
Ben Pfafff9b8c4c2014-03-20 10:45:21 -070095 if (!*used || time_after(stats->used, *used))
Pravin B Shelare298e502013-10-29 17:22:21 -070096 *used = stats->used;
97 *tcp_flags |= stats->tcp_flags;
98 ovs_stats->n_packets += stats->packet_count;
99 ovs_stats->n_bytes += stats->byte_count;
100 spin_unlock(&stats->lock);
101}
102
103void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
104 unsigned long *used, __be16 *tcp_flags)
105{
Flavio Leitner4f647e02014-03-27 11:05:34 -0300106 int cpu;
Pravin B Shelare298e502013-10-29 17:22:21 -0700107
108 *used = 0;
109 *tcp_flags = 0;
110 memset(ovs_stats, 0, sizeof(*ovs_stats));
111
Flavio Leitner4f647e02014-03-27 11:05:34 -0300112 local_bh_disable();
Pravin B Shelare298e502013-10-29 17:22:21 -0700113 if (!flow->stats.is_percpu) {
114 stats_read(flow->stats.stat, ovs_stats, used, tcp_flags);
115 } else {
Pravin B Shelare298e502013-10-29 17:22:21 -0700116 for_each_possible_cpu(cpu) {
117 struct flow_stats *stats;
118
Pravin B Shelare298e502013-10-29 17:22:21 -0700119 stats = per_cpu_ptr(flow->stats.cpu_stats, cpu);
120 stats_read(stats, ovs_stats, used, tcp_flags);
Pravin B Shelare298e502013-10-29 17:22:21 -0700121 }
Pravin B Shelare298e502013-10-29 17:22:21 -0700122 }
Flavio Leitner4f647e02014-03-27 11:05:34 -0300123 local_bh_enable();
Pravin B Shelare298e502013-10-29 17:22:21 -0700124}
125
126static void stats_reset(struct flow_stats *stats)
127{
128 spin_lock(&stats->lock);
129 stats->used = 0;
130 stats->packet_count = 0;
131 stats->byte_count = 0;
132 stats->tcp_flags = 0;
133 spin_unlock(&stats->lock);
134}
135
136void ovs_flow_stats_clear(struct sw_flow *flow)
137{
Flavio Leitner4f647e02014-03-27 11:05:34 -0300138 int cpu;
Pravin B Shelare298e502013-10-29 17:22:21 -0700139
Flavio Leitner4f647e02014-03-27 11:05:34 -0300140 local_bh_disable();
Pravin B Shelare298e502013-10-29 17:22:21 -0700141 if (!flow->stats.is_percpu) {
142 stats_reset(flow->stats.stat);
143 } else {
Pravin B Shelare298e502013-10-29 17:22:21 -0700144 for_each_possible_cpu(cpu) {
Pravin B Shelare298e502013-10-29 17:22:21 -0700145 stats_reset(per_cpu_ptr(flow->stats.cpu_stats, cpu));
Pravin B Shelare298e502013-10-29 17:22:21 -0700146 }
Pravin B Shelare298e502013-10-29 17:22:21 -0700147 }
Flavio Leitner4f647e02014-03-27 11:05:34 -0300148 local_bh_enable();
Andy Zhou03f0d912013-08-07 20:01:00 -0700149}
150
Jesse Grossccb13522011-10-25 19:26:31 -0700151static int check_header(struct sk_buff *skb, int len)
152{
153 if (unlikely(skb->len < len))
154 return -EINVAL;
155 if (unlikely(!pskb_may_pull(skb, len)))
156 return -ENOMEM;
157 return 0;
158}
159
160static bool arphdr_ok(struct sk_buff *skb)
161{
162 return pskb_may_pull(skb, skb_network_offset(skb) +
163 sizeof(struct arp_eth_header));
164}
165
166static int check_iphdr(struct sk_buff *skb)
167{
168 unsigned int nh_ofs = skb_network_offset(skb);
169 unsigned int ip_len;
170 int err;
171
172 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
173 if (unlikely(err))
174 return err;
175
176 ip_len = ip_hdrlen(skb);
177 if (unlikely(ip_len < sizeof(struct iphdr) ||
178 skb->len < nh_ofs + ip_len))
179 return -EINVAL;
180
181 skb_set_transport_header(skb, nh_ofs + ip_len);
182 return 0;
183}
184
185static bool tcphdr_ok(struct sk_buff *skb)
186{
187 int th_ofs = skb_transport_offset(skb);
188 int tcp_len;
189
190 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
191 return false;
192
193 tcp_len = tcp_hdrlen(skb);
194 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
195 skb->len < th_ofs + tcp_len))
196 return false;
197
198 return true;
199}
200
201static bool udphdr_ok(struct sk_buff *skb)
202{
203 return pskb_may_pull(skb, skb_transport_offset(skb) +
204 sizeof(struct udphdr));
205}
206
Joe Stringera175a722013-08-22 12:30:48 -0700207static bool sctphdr_ok(struct sk_buff *skb)
208{
209 return pskb_may_pull(skb, skb_transport_offset(skb) +
210 sizeof(struct sctphdr));
211}
212
Jesse Grossccb13522011-10-25 19:26:31 -0700213static bool icmphdr_ok(struct sk_buff *skb)
214{
215 return pskb_may_pull(skb, skb_transport_offset(skb) +
216 sizeof(struct icmphdr));
217}
218
Andy Zhou03f0d912013-08-07 20:01:00 -0700219static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
Jesse Grossccb13522011-10-25 19:26:31 -0700220{
221 unsigned int nh_ofs = skb_network_offset(skb);
222 unsigned int nh_len;
223 int payload_ofs;
224 struct ipv6hdr *nh;
225 uint8_t nexthdr;
226 __be16 frag_off;
227 int err;
228
Jesse Grossccb13522011-10-25 19:26:31 -0700229 err = check_header(skb, nh_ofs + sizeof(*nh));
230 if (unlikely(err))
231 return err;
232
233 nh = ipv6_hdr(skb);
234 nexthdr = nh->nexthdr;
235 payload_ofs = (u8 *)(nh + 1) - skb->data;
236
237 key->ip.proto = NEXTHDR_NONE;
238 key->ip.tos = ipv6_get_dsfield(nh);
239 key->ip.ttl = nh->hop_limit;
240 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
241 key->ipv6.addr.src = nh->saddr;
242 key->ipv6.addr.dst = nh->daddr;
243
244 payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
245 if (unlikely(payload_ofs < 0))
246 return -EINVAL;
247
248 if (frag_off) {
249 if (frag_off & htons(~0x7))
250 key->ip.frag = OVS_FRAG_TYPE_LATER;
251 else
252 key->ip.frag = OVS_FRAG_TYPE_FIRST;
253 }
254
255 nh_len = payload_ofs - nh_ofs;
256 skb_set_transport_header(skb, nh_ofs + nh_len);
257 key->ip.proto = nexthdr;
258 return nh_len;
259}
260
261static bool icmp6hdr_ok(struct sk_buff *skb)
262{
263 return pskb_may_pull(skb, skb_transport_offset(skb) +
264 sizeof(struct icmp6hdr));
265}
266
Jesse Grossccb13522011-10-25 19:26:31 -0700267static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
268{
269 struct qtag_prefix {
270 __be16 eth_type; /* ETH_P_8021Q */
271 __be16 tci;
272 };
273 struct qtag_prefix *qp;
274
275 if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
276 return 0;
277
278 if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
279 sizeof(__be16))))
280 return -ENOMEM;
281
282 qp = (struct qtag_prefix *) skb->data;
283 key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
284 __skb_pull(skb, sizeof(struct qtag_prefix));
285
286 return 0;
287}
288
289static __be16 parse_ethertype(struct sk_buff *skb)
290{
291 struct llc_snap_hdr {
292 u8 dsap; /* Always 0xAA */
293 u8 ssap; /* Always 0xAA */
294 u8 ctrl;
295 u8 oui[3];
296 __be16 ethertype;
297 };
298 struct llc_snap_hdr *llc;
299 __be16 proto;
300
301 proto = *(__be16 *) skb->data;
302 __skb_pull(skb, sizeof(__be16));
303
Simon Hormane5c5d222013-03-28 13:38:25 +0900304 if (ntohs(proto) >= ETH_P_802_3_MIN)
Jesse Grossccb13522011-10-25 19:26:31 -0700305 return proto;
306
307 if (skb->len < sizeof(struct llc_snap_hdr))
308 return htons(ETH_P_802_2);
309
310 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
311 return htons(0);
312
313 llc = (struct llc_snap_hdr *) skb->data;
314 if (llc->dsap != LLC_SAP_SNAP ||
315 llc->ssap != LLC_SAP_SNAP ||
316 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
317 return htons(ETH_P_802_2);
318
319 __skb_pull(skb, sizeof(struct llc_snap_hdr));
Rich Lane17b682a2013-02-19 11:10:30 -0800320
Simon Hormane5c5d222013-03-28 13:38:25 +0900321 if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
Rich Lane17b682a2013-02-19 11:10:30 -0800322 return llc->ethertype;
323
324 return htons(ETH_P_802_2);
Jesse Grossccb13522011-10-25 19:26:31 -0700325}
326
327static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
Andy Zhou03f0d912013-08-07 20:01:00 -0700328 int nh_len)
Jesse Grossccb13522011-10-25 19:26:31 -0700329{
330 struct icmp6hdr *icmp = icmp6_hdr(skb);
Jesse Grossccb13522011-10-25 19:26:31 -0700331
332 /* The ICMPv6 type and code fields use the 16-bit transport port
333 * fields, so we need to store them in 16-bit network byte order.
334 */
335 key->ipv6.tp.src = htons(icmp->icmp6_type);
336 key->ipv6.tp.dst = htons(icmp->icmp6_code);
Jesse Grossccb13522011-10-25 19:26:31 -0700337
338 if (icmp->icmp6_code == 0 &&
339 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
340 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
341 int icmp_len = skb->len - skb_transport_offset(skb);
342 struct nd_msg *nd;
343 int offset;
344
Jesse Grossccb13522011-10-25 19:26:31 -0700345 /* In order to process neighbor discovery options, we need the
346 * entire packet.
347 */
348 if (unlikely(icmp_len < sizeof(*nd)))
Andy Zhou03f0d912013-08-07 20:01:00 -0700349 return 0;
350
351 if (unlikely(skb_linearize(skb)))
352 return -ENOMEM;
Jesse Grossccb13522011-10-25 19:26:31 -0700353
354 nd = (struct nd_msg *)skb_transport_header(skb);
355 key->ipv6.nd.target = nd->target;
Jesse Grossccb13522011-10-25 19:26:31 -0700356
357 icmp_len -= sizeof(*nd);
358 offset = 0;
359 while (icmp_len >= 8) {
360 struct nd_opt_hdr *nd_opt =
361 (struct nd_opt_hdr *)(nd->opt + offset);
362 int opt_len = nd_opt->nd_opt_len * 8;
363
364 if (unlikely(!opt_len || opt_len > icmp_len))
Andy Zhou03f0d912013-08-07 20:01:00 -0700365 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700366
367 /* Store the link layer address if the appropriate
368 * option is provided. It is considered an error if
369 * the same link layer option is specified twice.
370 */
371 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
372 && opt_len == 8) {
373 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
374 goto invalid;
375 memcpy(key->ipv6.nd.sll,
376 &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
377 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
378 && opt_len == 8) {
379 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
380 goto invalid;
381 memcpy(key->ipv6.nd.tll,
382 &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
383 }
384
385 icmp_len -= opt_len;
386 offset += opt_len;
387 }
388 }
389
Andy Zhou03f0d912013-08-07 20:01:00 -0700390 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700391
392invalid:
393 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
394 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
395 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
396
Andy Zhou03f0d912013-08-07 20:01:00 -0700397 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700398}
399
400/**
401 * ovs_flow_extract - extracts a flow key from an Ethernet frame.
402 * @skb: sk_buff that contains the frame, with skb->data pointing to the
403 * Ethernet header
404 * @in_port: port number on which @skb was received.
405 * @key: output flow key
Jesse Grossccb13522011-10-25 19:26:31 -0700406 *
407 * The caller must ensure that skb->len >= ETH_HLEN.
408 *
409 * Returns 0 if successful, otherwise a negative errno value.
410 *
411 * Initializes @skb header pointers as follows:
412 *
413 * - skb->mac_header: the Ethernet header.
414 *
415 * - skb->network_header: just past the Ethernet header, or just past the
416 * VLAN header, to the first byte of the Ethernet payload.
417 *
Lorand Jakab34d94f22013-06-03 10:01:14 -0700418 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
Jesse Grossccb13522011-10-25 19:26:31 -0700419 * on output, then just past the IP header, if one is present and
420 * of a correct length, otherwise the same as skb->network_header.
Lorand Jakab34d94f22013-06-03 10:01:14 -0700421 * For other key->eth.type values it is left untouched.
Jesse Grossccb13522011-10-25 19:26:31 -0700422 */
Andy Zhou03f0d912013-08-07 20:01:00 -0700423int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
Jesse Grossccb13522011-10-25 19:26:31 -0700424{
Andy Zhou03f0d912013-08-07 20:01:00 -0700425 int error;
Jesse Grossccb13522011-10-25 19:26:31 -0700426 struct ethhdr *eth;
427
428 memset(key, 0, sizeof(*key));
429
430 key->phy.priority = skb->priority;
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700431 if (OVS_CB(skb)->tun_key)
432 memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
Jesse Grossccb13522011-10-25 19:26:31 -0700433 key->phy.in_port = in_port;
Ansis Atteka39c7caeb2012-11-26 11:24:11 -0800434 key->phy.skb_mark = skb->mark;
Jesse Grossccb13522011-10-25 19:26:31 -0700435
436 skb_reset_mac_header(skb);
437
438 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
439 * header in the linear data area.
440 */
441 eth = eth_hdr(skb);
442 memcpy(key->eth.src, eth->h_source, ETH_ALEN);
443 memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
444
445 __skb_pull(skb, 2 * ETH_ALEN);
Pravin B Shelarb34df5e2013-06-13 11:11:44 -0700446 /* We are going to push all headers that we pull, so no need to
447 * update skb->csum here.
448 */
Jesse Grossccb13522011-10-25 19:26:31 -0700449
450 if (vlan_tx_tag_present(skb))
451 key->eth.tci = htons(skb->vlan_tci);
452 else if (eth->h_proto == htons(ETH_P_8021Q))
453 if (unlikely(parse_vlan(skb, key)))
454 return -ENOMEM;
455
456 key->eth.type = parse_ethertype(skb);
457 if (unlikely(key->eth.type == htons(0)))
458 return -ENOMEM;
459
460 skb_reset_network_header(skb);
461 __skb_push(skb, skb->data - skb_mac_header(skb));
462
463 /* Network layer. */
464 if (key->eth.type == htons(ETH_P_IP)) {
465 struct iphdr *nh;
466 __be16 offset;
467
Jesse Grossccb13522011-10-25 19:26:31 -0700468 error = check_iphdr(skb);
469 if (unlikely(error)) {
470 if (error == -EINVAL) {
471 skb->transport_header = skb->network_header;
472 error = 0;
473 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700474 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700475 }
476
477 nh = ip_hdr(skb);
478 key->ipv4.addr.src = nh->saddr;
479 key->ipv4.addr.dst = nh->daddr;
480
481 key->ip.proto = nh->protocol;
482 key->ip.tos = nh->tos;
483 key->ip.ttl = nh->ttl;
484
485 offset = nh->frag_off & htons(IP_OFFSET);
486 if (offset) {
487 key->ip.frag = OVS_FRAG_TYPE_LATER;
Andy Zhou03f0d912013-08-07 20:01:00 -0700488 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700489 }
490 if (nh->frag_off & htons(IP_MF) ||
491 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
492 key->ip.frag = OVS_FRAG_TYPE_FIRST;
493
494 /* Transport layer. */
495 if (key->ip.proto == IPPROTO_TCP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700496 if (tcphdr_ok(skb)) {
497 struct tcphdr *tcp = tcp_hdr(skb);
498 key->ipv4.tp.src = tcp->source;
499 key->ipv4.tp.dst = tcp->dest;
Jarno Rajahalme5eb26b12013-10-23 01:44:59 -0700500 key->ipv4.tp.flags = TCP_FLAGS_BE16(tcp);
Jesse Grossccb13522011-10-25 19:26:31 -0700501 }
502 } else if (key->ip.proto == IPPROTO_UDP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700503 if (udphdr_ok(skb)) {
504 struct udphdr *udp = udp_hdr(skb);
505 key->ipv4.tp.src = udp->source;
506 key->ipv4.tp.dst = udp->dest;
507 }
Joe Stringera175a722013-08-22 12:30:48 -0700508 } else if (key->ip.proto == IPPROTO_SCTP) {
509 if (sctphdr_ok(skb)) {
510 struct sctphdr *sctp = sctp_hdr(skb);
511 key->ipv4.tp.src = sctp->source;
512 key->ipv4.tp.dst = sctp->dest;
513 }
Jesse Grossccb13522011-10-25 19:26:31 -0700514 } else if (key->ip.proto == IPPROTO_ICMP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700515 if (icmphdr_ok(skb)) {
516 struct icmphdr *icmp = icmp_hdr(skb);
517 /* The ICMP type and code fields use the 16-bit
518 * transport port fields, so we need to store
519 * them in 16-bit network byte order. */
520 key->ipv4.tp.src = htons(icmp->type);
521 key->ipv4.tp.dst = htons(icmp->code);
522 }
523 }
524
Mehak Mahajanc0618532012-11-02 14:14:31 -0700525 } else if ((key->eth.type == htons(ETH_P_ARP) ||
526 key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
Jesse Grossccb13522011-10-25 19:26:31 -0700527 struct arp_eth_header *arp;
528
529 arp = (struct arp_eth_header *)skb_network_header(skb);
530
531 if (arp->ar_hrd == htons(ARPHRD_ETHER)
532 && arp->ar_pro == htons(ETH_P_IP)
533 && arp->ar_hln == ETH_ALEN
534 && arp->ar_pln == 4) {
535
536 /* We only match on the lower 8 bits of the opcode. */
537 if (ntohs(arp->ar_op) <= 0xff)
538 key->ip.proto = ntohs(arp->ar_op);
Mehak Mahajand04d3822012-10-30 15:50:28 -0700539 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
540 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
541 memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
542 memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
Jesse Grossccb13522011-10-25 19:26:31 -0700543 }
544 } else if (key->eth.type == htons(ETH_P_IPV6)) {
545 int nh_len; /* IPv6 Header + Extensions */
546
Andy Zhou03f0d912013-08-07 20:01:00 -0700547 nh_len = parse_ipv6hdr(skb, key);
Jesse Grossccb13522011-10-25 19:26:31 -0700548 if (unlikely(nh_len < 0)) {
Andy Zhou03f0d912013-08-07 20:01:00 -0700549 if (nh_len == -EINVAL) {
Jesse Grossccb13522011-10-25 19:26:31 -0700550 skb->transport_header = skb->network_header;
Andy Zhou03f0d912013-08-07 20:01:00 -0700551 error = 0;
552 } else {
Jesse Grossccb13522011-10-25 19:26:31 -0700553 error = nh_len;
Andy Zhou03f0d912013-08-07 20:01:00 -0700554 }
555 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700556 }
557
558 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
Andy Zhou03f0d912013-08-07 20:01:00 -0700559 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700560 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
561 key->ip.frag = OVS_FRAG_TYPE_FIRST;
562
563 /* Transport layer. */
564 if (key->ip.proto == NEXTHDR_TCP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700565 if (tcphdr_ok(skb)) {
566 struct tcphdr *tcp = tcp_hdr(skb);
567 key->ipv6.tp.src = tcp->source;
568 key->ipv6.tp.dst = tcp->dest;
Jarno Rajahalme5eb26b12013-10-23 01:44:59 -0700569 key->ipv6.tp.flags = TCP_FLAGS_BE16(tcp);
Jesse Grossccb13522011-10-25 19:26:31 -0700570 }
571 } else if (key->ip.proto == NEXTHDR_UDP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700572 if (udphdr_ok(skb)) {
573 struct udphdr *udp = udp_hdr(skb);
574 key->ipv6.tp.src = udp->source;
575 key->ipv6.tp.dst = udp->dest;
576 }
Joe Stringera175a722013-08-22 12:30:48 -0700577 } else if (key->ip.proto == NEXTHDR_SCTP) {
578 if (sctphdr_ok(skb)) {
579 struct sctphdr *sctp = sctp_hdr(skb);
580 key->ipv6.tp.src = sctp->source;
581 key->ipv6.tp.dst = sctp->dest;
582 }
Jesse Grossccb13522011-10-25 19:26:31 -0700583 } else if (key->ip.proto == NEXTHDR_ICMP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700584 if (icmp6hdr_ok(skb)) {
Andy Zhou03f0d912013-08-07 20:01:00 -0700585 error = parse_icmpv6(skb, key, nh_len);
586 if (error)
587 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700588 }
589 }
590 }
591
Andy Zhou03f0d912013-08-07 20:01:00 -0700592 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700593}