blob: 7064da92f42037124576069e8ae10eb77203d73b [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
Ben Pfaffad552002014-05-06 16:48:38 -070064void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
65 struct sk_buff *skb)
Andy Zhou5828cd92013-08-27 13:02:21 -070066{
Pravin B Shelare298e502013-10-29 17:22:21 -070067 struct flow_stats *stats;
Jarno Rajahalme63e79592014-03-27 12:42:54 -070068 int node = numa_node_id();
Andy Zhou5828cd92013-08-27 13:02:21 -070069
Jarno Rajahalme63e79592014-03-27 12:42:54 -070070 stats = rcu_dereference(flow->stats[node]);
Pravin B Shelare298e502013-10-29 17:22:21 -070071
Jarno Rajahalme63e79592014-03-27 12:42:54 -070072 /* 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)
Andreea-Cristina Bernat8c6b00c2014-08-17 16:29:43 +030092 && likely(!rcu_access_pointer(flow->stats[node]))) {
Jarno Rajahalme63e79592014-03-27 12:42:54 -070093 /* 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
Pravin B Shelare298e502013-10-29 17:22:21 -0700117 stats->used = jiffies;
118 stats->packet_count++;
119 stats->byte_count += skb->len;
120 stats->tcp_flags |= tcp_flags;
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700121unlock:
Pravin B Shelare298e502013-10-29 17:22:21 -0700122 spin_unlock(&stats->lock);
123}
124
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700125/* Must be called with rcu_read_lock or ovs_mutex. */
126void ovs_flow_stats_get(const struct sw_flow *flow,
127 struct ovs_flow_stats *ovs_stats,
Pravin B Shelare298e502013-10-29 17:22:21 -0700128 unsigned long *used, __be16 *tcp_flags)
129{
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700130 int node;
Pravin B Shelare298e502013-10-29 17:22:21 -0700131
132 *used = 0;
133 *tcp_flags = 0;
134 memset(ovs_stats, 0, sizeof(*ovs_stats));
135
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700136 for_each_node(node) {
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700137 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
Pravin B Shelare298e502013-10-29 17:22:21 -0700138
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700139 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 }
Pravin B Shelare298e502013-10-29 17:22:21 -0700151 }
Pravin B Shelare298e502013-10-29 17:22:21 -0700152}
153
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700154/* Called with ovs_mutex. */
Pravin B Shelare298e502013-10-29 17:22:21 -0700155void ovs_flow_stats_clear(struct sw_flow *flow)
156{
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700157 int node;
Pravin B Shelare298e502013-10-29 17:22:21 -0700158
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700159 for_each_node(node) {
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700160 struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
Jarno Rajahalme23dabf82014-03-27 12:35:23 -0700161
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700162 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 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700171}
172
Jesse Grossccb13522011-10-25 19:26:31 -0700173static 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
182static 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
188static 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
207static 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
223static bool udphdr_ok(struct sk_buff *skb)
224{
225 return pskb_may_pull(skb, skb_transport_offset(skb) +
226 sizeof(struct udphdr));
227}
228
Joe Stringera175a722013-08-22 12:30:48 -0700229static bool sctphdr_ok(struct sk_buff *skb)
230{
231 return pskb_may_pull(skb, skb_transport_offset(skb) +
232 sizeof(struct sctphdr));
233}
234
Jesse Grossccb13522011-10-25 19:26:31 -0700235static bool icmphdr_ok(struct sk_buff *skb)
236{
237 return pskb_may_pull(skb, skb_transport_offset(skb) +
238 sizeof(struct icmphdr));
239}
240
Andy Zhou03f0d912013-08-07 20:01:00 -0700241static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
Jesse Grossccb13522011-10-25 19:26:31 -0700242{
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
Jesse Grossccb13522011-10-25 19:26:31 -0700251 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
283static bool icmp6hdr_ok(struct sk_buff *skb)
284{
285 return pskb_may_pull(skb, skb_transport_offset(skb) +
286 sizeof(struct icmp6hdr));
287}
288
Jesse Grossccb13522011-10-25 19:26:31 -0700289static 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
311static __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
Simon Hormane5c5d222013-03-28 13:38:25 +0900326 if (ntohs(proto) >= ETH_P_802_3_MIN)
Jesse Grossccb13522011-10-25 19:26:31 -0700327 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));
Rich Lane17b682a2013-02-19 11:10:30 -0800342
Simon Hormane5c5d222013-03-28 13:38:25 +0900343 if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
Rich Lane17b682a2013-02-19 11:10:30 -0800344 return llc->ethertype;
345
346 return htons(ETH_P_802_2);
Jesse Grossccb13522011-10-25 19:26:31 -0700347}
348
349static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
Andy Zhou03f0d912013-08-07 20:01:00 -0700350 int nh_len)
Jesse Grossccb13522011-10-25 19:26:31 -0700351{
352 struct icmp6hdr *icmp = icmp6_hdr(skb);
Jesse Grossccb13522011-10-25 19:26:31 -0700353
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 */
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700357 key->tp.src = htons(icmp->icmp6_type);
358 key->tp.dst = htons(icmp->icmp6_code);
Jesse Grossccb13522011-10-25 19:26:31 -0700359
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
Jesse Grossccb13522011-10-25 19:26:31 -0700367 /* In order to process neighbor discovery options, we need the
368 * entire packet.
369 */
370 if (unlikely(icmp_len < sizeof(*nd)))
Andy Zhou03f0d912013-08-07 20:01:00 -0700371 return 0;
372
373 if (unlikely(skb_linearize(skb)))
374 return -ENOMEM;
Jesse Grossccb13522011-10-25 19:26:31 -0700375
376 nd = (struct nd_msg *)skb_transport_header(skb);
377 key->ipv6.nd.target = nd->target;
Jesse Grossccb13522011-10-25 19:26:31 -0700378
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))
Andy Zhou03f0d912013-08-07 20:01:00 -0700387 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700388
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;
Joe Perches8c63ff02014-02-18 11:15:45 -0800397 ether_addr_copy(key->ipv6.nd.sll,
398 &nd->opt[offset+sizeof(*nd_opt)]);
Jesse Grossccb13522011-10-25 19:26:31 -0700399 } 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;
Joe Perches8c63ff02014-02-18 11:15:45 -0800403 ether_addr_copy(key->ipv6.nd.tll,
404 &nd->opt[offset+sizeof(*nd_opt)]);
Jesse Grossccb13522011-10-25 19:26:31 -0700405 }
406
407 icmp_len -= opt_len;
408 offset += opt_len;
409 }
410 }
411
Andy Zhou03f0d912013-08-07 20:01:00 -0700412 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700413
414invalid:
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
Andy Zhou03f0d912013-08-07 20:01:00 -0700419 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700420}
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
Jesse Grossccb13522011-10-25 19:26:31 -0700428 *
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 *
Lorand Jakab34d94f22013-06-03 10:01:14 -0700440 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
Jesse Grossccb13522011-10-25 19:26:31 -0700441 * 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.
Lorand Jakab34d94f22013-06-03 10:01:14 -0700443 * For other key->eth.type values it is left untouched.
Jesse Grossccb13522011-10-25 19:26:31 -0700444 */
Andy Zhou03f0d912013-08-07 20:01:00 -0700445int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
Jesse Grossccb13522011-10-25 19:26:31 -0700446{
Andy Zhou03f0d912013-08-07 20:01:00 -0700447 int error;
Jesse Grossccb13522011-10-25 19:26:31 -0700448 struct ethhdr *eth;
449
450 memset(key, 0, sizeof(*key));
451
452 key->phy.priority = skb->priority;
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700453 if (OVS_CB(skb)->tun_key)
454 memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
Jesse Grossccb13522011-10-25 19:26:31 -0700455 key->phy.in_port = in_port;
Ansis Atteka39c7caeb2012-11-26 11:24:11 -0800456 key->phy.skb_mark = skb->mark;
Jesse Grossccb13522011-10-25 19:26:31 -0700457
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);
Joe Perches8c63ff02014-02-18 11:15:45 -0800464 ether_addr_copy(key->eth.src, eth->h_source);
465 ether_addr_copy(key->eth.dst, eth->h_dest);
Jesse Grossccb13522011-10-25 19:26:31 -0700466
467 __skb_pull(skb, 2 * ETH_ALEN);
Pravin B Shelarb34df5e2013-06-13 11:11:44 -0700468 /* We are going to push all headers that we pull, so no need to
469 * update skb->csum here.
470 */
Jesse Grossccb13522011-10-25 19:26:31 -0700471
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
Jesse Grossccb13522011-10-25 19:26:31 -0700490 error = check_iphdr(skb);
491 if (unlikely(error)) {
492 if (error == -EINVAL) {
493 skb->transport_header = skb->network_header;
494 error = 0;
495 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700496 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700497 }
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;
Andy Zhou03f0d912013-08-07 20:01:00 -0700510 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700511 }
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) {
Jesse Grossccb13522011-10-25 19:26:31 -0700518 if (tcphdr_ok(skb)) {
519 struct tcphdr *tcp = tcp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700520 key->tp.src = tcp->source;
521 key->tp.dst = tcp->dest;
522 key->tp.flags = TCP_FLAGS_BE16(tcp);
Jesse Grossccb13522011-10-25 19:26:31 -0700523 }
524 } else if (key->ip.proto == IPPROTO_UDP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700525 if (udphdr_ok(skb)) {
526 struct udphdr *udp = udp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700527 key->tp.src = udp->source;
528 key->tp.dst = udp->dest;
Jesse Grossccb13522011-10-25 19:26:31 -0700529 }
Joe Stringera175a722013-08-22 12:30:48 -0700530 } else if (key->ip.proto == IPPROTO_SCTP) {
531 if (sctphdr_ok(skb)) {
532 struct sctphdr *sctp = sctp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700533 key->tp.src = sctp->source;
534 key->tp.dst = sctp->dest;
Joe Stringera175a722013-08-22 12:30:48 -0700535 }
Jesse Grossccb13522011-10-25 19:26:31 -0700536 } else if (key->ip.proto == IPPROTO_ICMP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700537 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. */
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700542 key->tp.src = htons(icmp->type);
543 key->tp.dst = htons(icmp->code);
Jesse Grossccb13522011-10-25 19:26:31 -0700544 }
545 }
546
Mehak Mahajanc0618532012-11-02 14:14:31 -0700547 } else if ((key->eth.type == htons(ETH_P_ARP) ||
548 key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
Jesse Grossccb13522011-10-25 19:26:31 -0700549 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);
Mehak Mahajand04d3822012-10-30 15:50:28 -0700561 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));
Joe Perches8c63ff02014-02-18 11:15:45 -0800563 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
564 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
Jesse Grossccb13522011-10-25 19:26:31 -0700565 }
566 } else if (key->eth.type == htons(ETH_P_IPV6)) {
567 int nh_len; /* IPv6 Header + Extensions */
568
Andy Zhou03f0d912013-08-07 20:01:00 -0700569 nh_len = parse_ipv6hdr(skb, key);
Jesse Grossccb13522011-10-25 19:26:31 -0700570 if (unlikely(nh_len < 0)) {
Andy Zhou03f0d912013-08-07 20:01:00 -0700571 if (nh_len == -EINVAL) {
Jesse Grossccb13522011-10-25 19:26:31 -0700572 skb->transport_header = skb->network_header;
Andy Zhou03f0d912013-08-07 20:01:00 -0700573 error = 0;
574 } else {
Jesse Grossccb13522011-10-25 19:26:31 -0700575 error = nh_len;
Andy Zhou03f0d912013-08-07 20:01:00 -0700576 }
577 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700578 }
579
580 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
Andy Zhou03f0d912013-08-07 20:01:00 -0700581 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700582 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) {
Jesse Grossccb13522011-10-25 19:26:31 -0700587 if (tcphdr_ok(skb)) {
588 struct tcphdr *tcp = tcp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700589 key->tp.src = tcp->source;
590 key->tp.dst = tcp->dest;
591 key->tp.flags = TCP_FLAGS_BE16(tcp);
Jesse Grossccb13522011-10-25 19:26:31 -0700592 }
593 } else if (key->ip.proto == NEXTHDR_UDP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700594 if (udphdr_ok(skb)) {
595 struct udphdr *udp = udp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700596 key->tp.src = udp->source;
597 key->tp.dst = udp->dest;
Jesse Grossccb13522011-10-25 19:26:31 -0700598 }
Joe Stringera175a722013-08-22 12:30:48 -0700599 } else if (key->ip.proto == NEXTHDR_SCTP) {
600 if (sctphdr_ok(skb)) {
601 struct sctphdr *sctp = sctp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700602 key->tp.src = sctp->source;
603 key->tp.dst = sctp->dest;
Joe Stringera175a722013-08-22 12:30:48 -0700604 }
Jesse Grossccb13522011-10-25 19:26:31 -0700605 } else if (key->ip.proto == NEXTHDR_ICMP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700606 if (icmp6hdr_ok(skb)) {
Andy Zhou03f0d912013-08-07 20:01:00 -0700607 error = parse_icmpv6(skb, key, nh_len);
608 if (error)
609 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700610 }
611 }
612 }
613
Andy Zhou03f0d912013-08-07 20:01:00 -0700614 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700615}