blob: 4010423f2831d4300874150934f2030395afc042 [file] [log] [blame]
Jesse Grossccb13522011-10-25 19:26:31 -07001/*
Andy Zhou971427f32014-09-15 19:37:25 -07002 * Copyright (c) 2007-2014 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
Jesse Grossccb13522011-10-25 19:26:31 -070019#include <linux/uaccess.h>
20#include <linux/netdevice.h>
21#include <linux/etherdevice.h>
22#include <linux/if_ether.h>
23#include <linux/if_vlan.h>
24#include <net/llc_pdu.h>
25#include <linux/kernel.h>
26#include <linux/jhash.h>
27#include <linux/jiffies.h>
28#include <linux/llc.h>
29#include <linux/module.h>
30#include <linux/in.h>
31#include <linux/rcupdate.h>
32#include <linux/if_arp.h>
Jesse Grossccb13522011-10-25 19:26:31 -070033#include <linux/ip.h>
34#include <linux/ipv6.h>
Joe Stringera175a722013-08-22 12:30:48 -070035#include <linux/sctp.h>
Pravin B Shelare298e502013-10-29 17:22:21 -070036#include <linux/smp.h>
Jesse Grossccb13522011-10-25 19:26:31 -070037#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>
Pravin B Shelar7d5437c2013-06-17 17:50:18 -070043#include <net/ip_tunnels.h>
Jesse Grossccb13522011-10-25 19:26:31 -070044#include <net/ipv6.h>
45#include <net/ndisc.h>
46
Pravin B Shelar83c8df22014-09-15 19:20:31 -070047#include "datapath.h"
48#include "flow.h"
49#include "flow_netlink.h"
50
Pravin B Shelare6445712013-10-03 18:16:47 -070051u64 ovs_flow_used_time(unsigned long flow_jiffies)
Andy Zhou03f0d912013-08-07 20:01:00 -070052{
Pravin B Shelare6445712013-10-03 18:16:47 -070053 struct timespec cur_ts;
54 u64 cur_ms, idle_ms;
Andy Zhou03f0d912013-08-07 20:01:00 -070055
Pravin B Shelare6445712013-10-03 18:16:47 -070056 ktime_get_ts(&cur_ts);
57 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
58 cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
59 cur_ts.tv_nsec / NSEC_PER_MSEC;
Andy Zhou03f0d912013-08-07 20:01:00 -070060
Pravin B Shelare6445712013-10-03 18:16:47 -070061 return cur_ms - idle_ms;
Andy Zhou03f0d912013-08-07 20:01:00 -070062}
63
Jarno Rajahalmedf23e9f2013-10-23 01:40:44 -070064#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
Andy Zhou03f0d912013-08-07 20:01:00 -070065
Ben Pfaffad552002014-05-06 16:48:38 -070066void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
67 struct sk_buff *skb)
Andy Zhou5828cd92013-08-27 13:02:21 -070068{
Pravin B Shelare298e502013-10-29 17:22:21 -070069 struct flow_stats *stats;
Jarno Rajahalme63e79592014-03-27 12:42:54 -070070 int node = numa_node_id();
Andy Zhou5828cd92013-08-27 13:02:21 -070071
Jarno Rajahalme63e79592014-03-27 12:42:54 -070072 stats = rcu_dereference(flow->stats[node]);
Pravin B Shelare298e502013-10-29 17:22:21 -070073
Jarno Rajahalme63e79592014-03-27 12:42:54 -070074 /* Check if already have node-specific stats. */
75 if (likely(stats)) {
76 spin_lock(&stats->lock);
77 /* Mark if we write on the pre-allocated stats. */
78 if (node == 0 && unlikely(flow->stats_last_writer != node))
79 flow->stats_last_writer = node;
80 } else {
81 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
82 spin_lock(&stats->lock);
83
84 /* If the current NUMA-node is the only writer on the
85 * pre-allocated stats keep using them.
86 */
87 if (unlikely(flow->stats_last_writer != node)) {
88 /* A previous locker may have already allocated the
89 * stats, so we need to check again. If node-specific
90 * stats were already allocated, we update the pre-
91 * allocated stats as we have already locked them.
92 */
93 if (likely(flow->stats_last_writer != NUMA_NO_NODE)
Andreea-Cristina Bernat8c6b00c2014-08-17 16:29:43 +030094 && likely(!rcu_access_pointer(flow->stats[node]))) {
Jarno Rajahalme63e79592014-03-27 12:42:54 -070095 /* Try to allocate node-specific stats. */
96 struct flow_stats *new_stats;
97
98 new_stats =
99 kmem_cache_alloc_node(flow_stats_cache,
100 GFP_THISNODE |
101 __GFP_NOMEMALLOC,
102 node);
103 if (likely(new_stats)) {
104 new_stats->used = jiffies;
105 new_stats->packet_count = 1;
106 new_stats->byte_count = skb->len;
107 new_stats->tcp_flags = tcp_flags;
108 spin_lock_init(&new_stats->lock);
109
110 rcu_assign_pointer(flow->stats[node],
111 new_stats);
112 goto unlock;
113 }
114 }
115 flow->stats_last_writer = node;
116 }
117 }
118
Pravin B Shelare298e502013-10-29 17:22:21 -0700119 stats->used = jiffies;
120 stats->packet_count++;
121 stats->byte_count += skb->len;
122 stats->tcp_flags |= tcp_flags;
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700123unlock:
Pravin B Shelare298e502013-10-29 17:22:21 -0700124 spin_unlock(&stats->lock);
125}
126
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700127/* Must be called with rcu_read_lock or ovs_mutex. */
128void ovs_flow_stats_get(const struct sw_flow *flow,
129 struct ovs_flow_stats *ovs_stats,
Pravin B Shelare298e502013-10-29 17:22:21 -0700130 unsigned long *used, __be16 *tcp_flags)
131{
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700132 int node;
Pravin B Shelare298e502013-10-29 17:22:21 -0700133
134 *used = 0;
135 *tcp_flags = 0;
136 memset(ovs_stats, 0, sizeof(*ovs_stats));
137
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700138 for_each_node(node) {
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700139 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
Pravin B Shelare298e502013-10-29 17:22:21 -0700140
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700141 if (stats) {
142 /* Local CPU may write on non-local stats, so we must
143 * block bottom-halves here.
144 */
145 spin_lock_bh(&stats->lock);
146 if (!*used || time_after(stats->used, *used))
147 *used = stats->used;
148 *tcp_flags |= stats->tcp_flags;
149 ovs_stats->n_packets += stats->packet_count;
150 ovs_stats->n_bytes += stats->byte_count;
151 spin_unlock_bh(&stats->lock);
152 }
Pravin B Shelare298e502013-10-29 17:22:21 -0700153 }
Pravin B Shelare298e502013-10-29 17:22:21 -0700154}
155
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700156/* Called with ovs_mutex. */
Pravin B Shelare298e502013-10-29 17:22:21 -0700157void ovs_flow_stats_clear(struct sw_flow *flow)
158{
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700159 int node;
Pravin B Shelare298e502013-10-29 17:22:21 -0700160
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700161 for_each_node(node) {
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700162 struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
Jarno Rajahalme23dabf82014-03-27 12:35:23 -0700163
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700164 if (stats) {
165 spin_lock_bh(&stats->lock);
166 stats->used = 0;
167 stats->packet_count = 0;
168 stats->byte_count = 0;
169 stats->tcp_flags = 0;
170 spin_unlock_bh(&stats->lock);
171 }
172 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700173}
174
Jesse Grossccb13522011-10-25 19:26:31 -0700175static int check_header(struct sk_buff *skb, int len)
176{
177 if (unlikely(skb->len < len))
178 return -EINVAL;
179 if (unlikely(!pskb_may_pull(skb, len)))
180 return -ENOMEM;
181 return 0;
182}
183
184static bool arphdr_ok(struct sk_buff *skb)
185{
186 return pskb_may_pull(skb, skb_network_offset(skb) +
187 sizeof(struct arp_eth_header));
188}
189
190static int check_iphdr(struct sk_buff *skb)
191{
192 unsigned int nh_ofs = skb_network_offset(skb);
193 unsigned int ip_len;
194 int err;
195
196 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
197 if (unlikely(err))
198 return err;
199
200 ip_len = ip_hdrlen(skb);
201 if (unlikely(ip_len < sizeof(struct iphdr) ||
202 skb->len < nh_ofs + ip_len))
203 return -EINVAL;
204
205 skb_set_transport_header(skb, nh_ofs + ip_len);
206 return 0;
207}
208
209static bool tcphdr_ok(struct sk_buff *skb)
210{
211 int th_ofs = skb_transport_offset(skb);
212 int tcp_len;
213
214 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
215 return false;
216
217 tcp_len = tcp_hdrlen(skb);
218 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
219 skb->len < th_ofs + tcp_len))
220 return false;
221
222 return true;
223}
224
225static bool udphdr_ok(struct sk_buff *skb)
226{
227 return pskb_may_pull(skb, skb_transport_offset(skb) +
228 sizeof(struct udphdr));
229}
230
Joe Stringera175a722013-08-22 12:30:48 -0700231static bool sctphdr_ok(struct sk_buff *skb)
232{
233 return pskb_may_pull(skb, skb_transport_offset(skb) +
234 sizeof(struct sctphdr));
235}
236
Jesse Grossccb13522011-10-25 19:26:31 -0700237static bool icmphdr_ok(struct sk_buff *skb)
238{
239 return pskb_may_pull(skb, skb_transport_offset(skb) +
240 sizeof(struct icmphdr));
241}
242
Andy Zhou03f0d912013-08-07 20:01:00 -0700243static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
Jesse Grossccb13522011-10-25 19:26:31 -0700244{
245 unsigned int nh_ofs = skb_network_offset(skb);
246 unsigned int nh_len;
247 int payload_ofs;
248 struct ipv6hdr *nh;
249 uint8_t nexthdr;
250 __be16 frag_off;
251 int err;
252
Jesse Grossccb13522011-10-25 19:26:31 -0700253 err = check_header(skb, nh_ofs + sizeof(*nh));
254 if (unlikely(err))
255 return err;
256
257 nh = ipv6_hdr(skb);
258 nexthdr = nh->nexthdr;
259 payload_ofs = (u8 *)(nh + 1) - skb->data;
260
261 key->ip.proto = NEXTHDR_NONE;
262 key->ip.tos = ipv6_get_dsfield(nh);
263 key->ip.ttl = nh->hop_limit;
264 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
265 key->ipv6.addr.src = nh->saddr;
266 key->ipv6.addr.dst = nh->daddr;
267
268 payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
269 if (unlikely(payload_ofs < 0))
270 return -EINVAL;
271
272 if (frag_off) {
273 if (frag_off & htons(~0x7))
274 key->ip.frag = OVS_FRAG_TYPE_LATER;
275 else
276 key->ip.frag = OVS_FRAG_TYPE_FIRST;
277 }
278
279 nh_len = payload_ofs - nh_ofs;
280 skb_set_transport_header(skb, nh_ofs + nh_len);
281 key->ip.proto = nexthdr;
282 return nh_len;
283}
284
285static bool icmp6hdr_ok(struct sk_buff *skb)
286{
287 return pskb_may_pull(skb, skb_transport_offset(skb) +
288 sizeof(struct icmp6hdr));
289}
290
Jesse Grossccb13522011-10-25 19:26:31 -0700291static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
292{
293 struct qtag_prefix {
294 __be16 eth_type; /* ETH_P_8021Q */
295 __be16 tci;
296 };
297 struct qtag_prefix *qp;
298
299 if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
300 return 0;
301
302 if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
303 sizeof(__be16))))
304 return -ENOMEM;
305
306 qp = (struct qtag_prefix *) skb->data;
307 key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
308 __skb_pull(skb, sizeof(struct qtag_prefix));
309
310 return 0;
311}
312
313static __be16 parse_ethertype(struct sk_buff *skb)
314{
315 struct llc_snap_hdr {
316 u8 dsap; /* Always 0xAA */
317 u8 ssap; /* Always 0xAA */
318 u8 ctrl;
319 u8 oui[3];
320 __be16 ethertype;
321 };
322 struct llc_snap_hdr *llc;
323 __be16 proto;
324
325 proto = *(__be16 *) skb->data;
326 __skb_pull(skb, sizeof(__be16));
327
Simon Hormane5c5d222013-03-28 13:38:25 +0900328 if (ntohs(proto) >= ETH_P_802_3_MIN)
Jesse Grossccb13522011-10-25 19:26:31 -0700329 return proto;
330
331 if (skb->len < sizeof(struct llc_snap_hdr))
332 return htons(ETH_P_802_2);
333
334 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
335 return htons(0);
336
337 llc = (struct llc_snap_hdr *) skb->data;
338 if (llc->dsap != LLC_SAP_SNAP ||
339 llc->ssap != LLC_SAP_SNAP ||
340 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
341 return htons(ETH_P_802_2);
342
343 __skb_pull(skb, sizeof(struct llc_snap_hdr));
Rich Lane17b682a2013-02-19 11:10:30 -0800344
Simon Hormane5c5d222013-03-28 13:38:25 +0900345 if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
Rich Lane17b682a2013-02-19 11:10:30 -0800346 return llc->ethertype;
347
348 return htons(ETH_P_802_2);
Jesse Grossccb13522011-10-25 19:26:31 -0700349}
350
351static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
Andy Zhou03f0d912013-08-07 20:01:00 -0700352 int nh_len)
Jesse Grossccb13522011-10-25 19:26:31 -0700353{
354 struct icmp6hdr *icmp = icmp6_hdr(skb);
Jesse Grossccb13522011-10-25 19:26:31 -0700355
356 /* The ICMPv6 type and code fields use the 16-bit transport port
357 * fields, so we need to store them in 16-bit network byte order.
358 */
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700359 key->tp.src = htons(icmp->icmp6_type);
360 key->tp.dst = htons(icmp->icmp6_code);
Jesse Grossccb13522011-10-25 19:26:31 -0700361
362 if (icmp->icmp6_code == 0 &&
363 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
364 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
365 int icmp_len = skb->len - skb_transport_offset(skb);
366 struct nd_msg *nd;
367 int offset;
368
Jesse Grossccb13522011-10-25 19:26:31 -0700369 /* In order to process neighbor discovery options, we need the
370 * entire packet.
371 */
372 if (unlikely(icmp_len < sizeof(*nd)))
Andy Zhou03f0d912013-08-07 20:01:00 -0700373 return 0;
374
375 if (unlikely(skb_linearize(skb)))
376 return -ENOMEM;
Jesse Grossccb13522011-10-25 19:26:31 -0700377
378 nd = (struct nd_msg *)skb_transport_header(skb);
379 key->ipv6.nd.target = nd->target;
Jesse Grossccb13522011-10-25 19:26:31 -0700380
381 icmp_len -= sizeof(*nd);
382 offset = 0;
383 while (icmp_len >= 8) {
384 struct nd_opt_hdr *nd_opt =
385 (struct nd_opt_hdr *)(nd->opt + offset);
386 int opt_len = nd_opt->nd_opt_len * 8;
387
388 if (unlikely(!opt_len || opt_len > icmp_len))
Andy Zhou03f0d912013-08-07 20:01:00 -0700389 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700390
391 /* Store the link layer address if the appropriate
392 * option is provided. It is considered an error if
393 * the same link layer option is specified twice.
394 */
395 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
396 && opt_len == 8) {
397 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
398 goto invalid;
Joe Perches8c63ff02014-02-18 11:15:45 -0800399 ether_addr_copy(key->ipv6.nd.sll,
400 &nd->opt[offset+sizeof(*nd_opt)]);
Jesse Grossccb13522011-10-25 19:26:31 -0700401 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
402 && opt_len == 8) {
403 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
404 goto invalid;
Joe Perches8c63ff02014-02-18 11:15:45 -0800405 ether_addr_copy(key->ipv6.nd.tll,
406 &nd->opt[offset+sizeof(*nd_opt)]);
Jesse Grossccb13522011-10-25 19:26:31 -0700407 }
408
409 icmp_len -= opt_len;
410 offset += opt_len;
411 }
412 }
413
Andy Zhou03f0d912013-08-07 20:01:00 -0700414 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700415
416invalid:
417 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
418 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
419 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
420
Andy Zhou03f0d912013-08-07 20:01:00 -0700421 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700422}
423
424/**
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700425 * key_extract - extracts a flow key from an Ethernet frame.
Jesse Grossccb13522011-10-25 19:26:31 -0700426 * @skb: sk_buff that contains the frame, with skb->data pointing to the
427 * Ethernet header
Jesse Grossccb13522011-10-25 19:26:31 -0700428 * @key: output flow key
Jesse Grossccb13522011-10-25 19:26:31 -0700429 *
430 * The caller must ensure that skb->len >= ETH_HLEN.
431 *
432 * Returns 0 if successful, otherwise a negative errno value.
433 *
434 * Initializes @skb header pointers as follows:
435 *
436 * - skb->mac_header: the Ethernet header.
437 *
438 * - skb->network_header: just past the Ethernet header, or just past the
439 * VLAN header, to the first byte of the Ethernet payload.
440 *
Lorand Jakab34d94f22013-06-03 10:01:14 -0700441 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
Jesse Grossccb13522011-10-25 19:26:31 -0700442 * on output, then just past the IP header, if one is present and
443 * of a correct length, otherwise the same as skb->network_header.
Lorand Jakab34d94f22013-06-03 10:01:14 -0700444 * For other key->eth.type values it is left untouched.
Jesse Grossccb13522011-10-25 19:26:31 -0700445 */
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700446static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
Jesse Grossccb13522011-10-25 19:26:31 -0700447{
Andy Zhou03f0d912013-08-07 20:01:00 -0700448 int error;
Jesse Grossccb13522011-10-25 19:26:31 -0700449 struct ethhdr *eth;
450
Jesse Grossccb13522011-10-25 19:26:31 -0700451 skb_reset_mac_header(skb);
452
453 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
454 * header in the linear data area.
455 */
456 eth = eth_hdr(skb);
Joe Perches8c63ff02014-02-18 11:15:45 -0800457 ether_addr_copy(key->eth.src, eth->h_source);
458 ether_addr_copy(key->eth.dst, eth->h_dest);
Jesse Grossccb13522011-10-25 19:26:31 -0700459
460 __skb_pull(skb, 2 * ETH_ALEN);
Pravin B Shelarb34df5e2013-06-13 11:11:44 -0700461 /* We are going to push all headers that we pull, so no need to
462 * update skb->csum here.
463 */
Jesse Grossccb13522011-10-25 19:26:31 -0700464
465 if (vlan_tx_tag_present(skb))
466 key->eth.tci = htons(skb->vlan_tci);
467 else if (eth->h_proto == htons(ETH_P_8021Q))
468 if (unlikely(parse_vlan(skb, key)))
469 return -ENOMEM;
470
471 key->eth.type = parse_ethertype(skb);
472 if (unlikely(key->eth.type == htons(0)))
473 return -ENOMEM;
474
475 skb_reset_network_header(skb);
476 __skb_push(skb, skb->data - skb_mac_header(skb));
477
478 /* Network layer. */
479 if (key->eth.type == htons(ETH_P_IP)) {
480 struct iphdr *nh;
481 __be16 offset;
482
Jesse Grossccb13522011-10-25 19:26:31 -0700483 error = check_iphdr(skb);
484 if (unlikely(error)) {
485 if (error == -EINVAL) {
486 skb->transport_header = skb->network_header;
487 error = 0;
488 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700489 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700490 }
491
492 nh = ip_hdr(skb);
493 key->ipv4.addr.src = nh->saddr;
494 key->ipv4.addr.dst = nh->daddr;
495
496 key->ip.proto = nh->protocol;
497 key->ip.tos = nh->tos;
498 key->ip.ttl = nh->ttl;
499
500 offset = nh->frag_off & htons(IP_OFFSET);
501 if (offset) {
502 key->ip.frag = OVS_FRAG_TYPE_LATER;
Andy Zhou03f0d912013-08-07 20:01:00 -0700503 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700504 }
505 if (nh->frag_off & htons(IP_MF) ||
506 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
507 key->ip.frag = OVS_FRAG_TYPE_FIRST;
508
509 /* Transport layer. */
510 if (key->ip.proto == IPPROTO_TCP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700511 if (tcphdr_ok(skb)) {
512 struct tcphdr *tcp = tcp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700513 key->tp.src = tcp->source;
514 key->tp.dst = tcp->dest;
515 key->tp.flags = TCP_FLAGS_BE16(tcp);
Jesse Grossccb13522011-10-25 19:26:31 -0700516 }
517 } else if (key->ip.proto == IPPROTO_UDP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700518 if (udphdr_ok(skb)) {
519 struct udphdr *udp = udp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700520 key->tp.src = udp->source;
521 key->tp.dst = udp->dest;
Jesse Grossccb13522011-10-25 19:26:31 -0700522 }
Joe Stringera175a722013-08-22 12:30:48 -0700523 } else if (key->ip.proto == IPPROTO_SCTP) {
524 if (sctphdr_ok(skb)) {
525 struct sctphdr *sctp = sctp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700526 key->tp.src = sctp->source;
527 key->tp.dst = sctp->dest;
Joe Stringera175a722013-08-22 12:30:48 -0700528 }
Jesse Grossccb13522011-10-25 19:26:31 -0700529 } else if (key->ip.proto == IPPROTO_ICMP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700530 if (icmphdr_ok(skb)) {
531 struct icmphdr *icmp = icmp_hdr(skb);
532 /* The ICMP type and code fields use the 16-bit
533 * transport port fields, so we need to store
534 * them in 16-bit network byte order. */
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700535 key->tp.src = htons(icmp->type);
536 key->tp.dst = htons(icmp->code);
Jesse Grossccb13522011-10-25 19:26:31 -0700537 }
538 }
539
Mehak Mahajanc0618532012-11-02 14:14:31 -0700540 } else if ((key->eth.type == htons(ETH_P_ARP) ||
541 key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
Jesse Grossccb13522011-10-25 19:26:31 -0700542 struct arp_eth_header *arp;
543
544 arp = (struct arp_eth_header *)skb_network_header(skb);
545
546 if (arp->ar_hrd == htons(ARPHRD_ETHER)
547 && arp->ar_pro == htons(ETH_P_IP)
548 && arp->ar_hln == ETH_ALEN
549 && arp->ar_pln == 4) {
550
551 /* We only match on the lower 8 bits of the opcode. */
552 if (ntohs(arp->ar_op) <= 0xff)
553 key->ip.proto = ntohs(arp->ar_op);
Mehak Mahajand04d3822012-10-30 15:50:28 -0700554 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
555 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
Joe Perches8c63ff02014-02-18 11:15:45 -0800556 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
557 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
Jesse Grossccb13522011-10-25 19:26:31 -0700558 }
559 } else if (key->eth.type == htons(ETH_P_IPV6)) {
560 int nh_len; /* IPv6 Header + Extensions */
561
Andy Zhou03f0d912013-08-07 20:01:00 -0700562 nh_len = parse_ipv6hdr(skb, key);
Jesse Grossccb13522011-10-25 19:26:31 -0700563 if (unlikely(nh_len < 0)) {
Andy Zhou03f0d912013-08-07 20:01:00 -0700564 if (nh_len == -EINVAL) {
Jesse Grossccb13522011-10-25 19:26:31 -0700565 skb->transport_header = skb->network_header;
Andy Zhou03f0d912013-08-07 20:01:00 -0700566 error = 0;
567 } else {
Jesse Grossccb13522011-10-25 19:26:31 -0700568 error = nh_len;
Andy Zhou03f0d912013-08-07 20:01:00 -0700569 }
570 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700571 }
572
573 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
Andy Zhou03f0d912013-08-07 20:01:00 -0700574 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700575 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
576 key->ip.frag = OVS_FRAG_TYPE_FIRST;
577
578 /* Transport layer. */
579 if (key->ip.proto == NEXTHDR_TCP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700580 if (tcphdr_ok(skb)) {
581 struct tcphdr *tcp = tcp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700582 key->tp.src = tcp->source;
583 key->tp.dst = tcp->dest;
584 key->tp.flags = TCP_FLAGS_BE16(tcp);
Jesse Grossccb13522011-10-25 19:26:31 -0700585 }
586 } else if (key->ip.proto == NEXTHDR_UDP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700587 if (udphdr_ok(skb)) {
588 struct udphdr *udp = udp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700589 key->tp.src = udp->source;
590 key->tp.dst = udp->dest;
Jesse Grossccb13522011-10-25 19:26:31 -0700591 }
Joe Stringera175a722013-08-22 12:30:48 -0700592 } else if (key->ip.proto == NEXTHDR_SCTP) {
593 if (sctphdr_ok(skb)) {
594 struct sctphdr *sctp = sctp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700595 key->tp.src = sctp->source;
596 key->tp.dst = sctp->dest;
Joe Stringera175a722013-08-22 12:30:48 -0700597 }
Jesse Grossccb13522011-10-25 19:26:31 -0700598 } else if (key->ip.proto == NEXTHDR_ICMP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700599 if (icmp6hdr_ok(skb)) {
Andy Zhou03f0d912013-08-07 20:01:00 -0700600 error = parse_icmpv6(skb, key, nh_len);
601 if (error)
602 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700603 }
604 }
605 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700606 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700607}
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700608
Andy Zhou971427f32014-09-15 19:37:25 -0700609int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
610{
611 return key_extract(skb, key);
612}
613
Pravin B Shelar8c8b1b82014-09-15 19:28:44 -0700614int ovs_flow_key_extract(struct ovs_key_ipv4_tunnel *tun_key,
615 struct sk_buff *skb, struct sw_flow_key *key)
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700616{
617 /* Extract metadata from packet. */
618 memset(key, 0, sizeof(*key));
Pravin B Shelar8c8b1b82014-09-15 19:28:44 -0700619 if (tun_key)
620 memcpy(&key->tun_key, tun_key, sizeof(key->tun_key));
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700621
622 key->phy.priority = skb->priority;
623 key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
624 key->phy.skb_mark = skb->mark;
625
626 return key_extract(skb, key);
627}
628
629int ovs_flow_key_extract_userspace(const struct nlattr *attr,
630 struct sk_buff *skb,
631 struct sw_flow_key *key)
632{
633 int err;
634
635 memset(key, 0, sizeof(*key));
636 /* Extract metadata from netlink attributes. */
637 err = ovs_nla_get_flow_metadata(attr, key);
638 if (err)
639 return err;
640
641 return key_extract(skb, key);
642}