blob: 0ea128eeeab2f835221b2068b1098a81fe1d731d [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>
Simon Horman25cd9ba2014-10-06 05:05:13 -070035#include <linux/mpls.h>
Joe Stringera175a722013-08-22 12:30:48 -070036#include <linux/sctp.h>
Pravin B Shelare298e502013-10-29 17:22:21 -070037#include <linux/smp.h>
Jesse Grossccb13522011-10-25 19:26:31 -070038#include <linux/tcp.h>
39#include <linux/udp.h>
40#include <linux/icmp.h>
41#include <linux/icmpv6.h>
42#include <linux/rculist.h>
43#include <net/ip.h>
Pravin B Shelar7d5437c2013-06-17 17:50:18 -070044#include <net/ip_tunnels.h>
Jesse Grossccb13522011-10-25 19:26:31 -070045#include <net/ipv6.h>
Simon Horman25cd9ba2014-10-06 05:05:13 -070046#include <net/mpls.h>
Jesse Grossccb13522011-10-25 19:26:31 -070047#include <net/ndisc.h>
48
Pravin B Shelara581b962015-08-29 17:44:08 -070049#include "conntrack.h"
Pravin B Shelar83c8df22014-09-15 19:20:31 -070050#include "datapath.h"
51#include "flow.h"
52#include "flow_netlink.h"
Pravin B Shelara581b962015-08-29 17:44:08 -070053#include "vport.h"
Pravin B Shelar83c8df22014-09-15 19:20:31 -070054
Pravin B Shelare6445712013-10-03 18:16:47 -070055u64 ovs_flow_used_time(unsigned long flow_jiffies)
Andy Zhou03f0d912013-08-07 20:01:00 -070056{
Pravin B Shelare6445712013-10-03 18:16:47 -070057 struct timespec cur_ts;
58 u64 cur_ms, idle_ms;
Andy Zhou03f0d912013-08-07 20:01:00 -070059
Pravin B Shelare6445712013-10-03 18:16:47 -070060 ktime_get_ts(&cur_ts);
61 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
62 cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
63 cur_ts.tv_nsec / NSEC_PER_MSEC;
Andy Zhou03f0d912013-08-07 20:01:00 -070064
Pravin B Shelare6445712013-10-03 18:16:47 -070065 return cur_ms - idle_ms;
Andy Zhou03f0d912013-08-07 20:01:00 -070066}
67
Jarno Rajahalmedf23e9f2013-10-23 01:40:44 -070068#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
Andy Zhou03f0d912013-08-07 20:01:00 -070069
Ben Pfaffad552002014-05-06 16:48:38 -070070void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
Thomas Graf12eb18f2014-11-06 06:58:52 -080071 const struct sk_buff *skb)
Andy Zhou5828cd92013-08-27 13:02:21 -070072{
Pravin B Shelare298e502013-10-29 17:22:21 -070073 struct flow_stats *stats;
Jarno Rajahalme63e79592014-03-27 12:42:54 -070074 int node = numa_node_id();
Jiri Pirkodf8a39d2015-01-13 17:13:44 +010075 int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
Andy Zhou5828cd92013-08-27 13:02:21 -070076
Jarno Rajahalme63e79592014-03-27 12:42:54 -070077 stats = rcu_dereference(flow->stats[node]);
Pravin B Shelare298e502013-10-29 17:22:21 -070078
Jarno Rajahalme63e79592014-03-27 12:42:54 -070079 /* Check if already have node-specific stats. */
80 if (likely(stats)) {
81 spin_lock(&stats->lock);
82 /* Mark if we write on the pre-allocated stats. */
83 if (node == 0 && unlikely(flow->stats_last_writer != node))
84 flow->stats_last_writer = node;
85 } else {
86 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
87 spin_lock(&stats->lock);
88
89 /* If the current NUMA-node is the only writer on the
90 * pre-allocated stats keep using them.
91 */
92 if (unlikely(flow->stats_last_writer != node)) {
93 /* A previous locker may have already allocated the
94 * stats, so we need to check again. If node-specific
95 * stats were already allocated, we update the pre-
96 * allocated stats as we have already locked them.
97 */
98 if (likely(flow->stats_last_writer != NUMA_NO_NODE)
Andreea-Cristina Bernat8c6b00c2014-08-17 16:29:43 +030099 && likely(!rcu_access_pointer(flow->stats[node]))) {
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700100 /* Try to allocate node-specific stats. */
101 struct flow_stats *new_stats;
102
103 new_stats =
104 kmem_cache_alloc_node(flow_stats_cache,
David Rientjes4167e9b2015-04-14 15:46:55 -0700105 GFP_NOWAIT |
106 __GFP_THISNODE |
107 __GFP_NOWARN |
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700108 __GFP_NOMEMALLOC,
109 node);
110 if (likely(new_stats)) {
111 new_stats->used = jiffies;
112 new_stats->packet_count = 1;
Ben Pfaff24cc59d2014-12-31 08:45:46 -0800113 new_stats->byte_count = len;
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700114 new_stats->tcp_flags = tcp_flags;
115 spin_lock_init(&new_stats->lock);
116
117 rcu_assign_pointer(flow->stats[node],
118 new_stats);
119 goto unlock;
120 }
121 }
122 flow->stats_last_writer = node;
123 }
124 }
125
Pravin B Shelare298e502013-10-29 17:22:21 -0700126 stats->used = jiffies;
127 stats->packet_count++;
Ben Pfaff24cc59d2014-12-31 08:45:46 -0800128 stats->byte_count += len;
Pravin B Shelare298e502013-10-29 17:22:21 -0700129 stats->tcp_flags |= tcp_flags;
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700130unlock:
Pravin B Shelare298e502013-10-29 17:22:21 -0700131 spin_unlock(&stats->lock);
132}
133
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700134/* Must be called with rcu_read_lock or ovs_mutex. */
135void ovs_flow_stats_get(const struct sw_flow *flow,
136 struct ovs_flow_stats *ovs_stats,
Pravin B Shelare298e502013-10-29 17:22:21 -0700137 unsigned long *used, __be16 *tcp_flags)
138{
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700139 int node;
Pravin B Shelare298e502013-10-29 17:22:21 -0700140
141 *used = 0;
142 *tcp_flags = 0;
143 memset(ovs_stats, 0, sizeof(*ovs_stats));
144
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700145 for_each_node(node) {
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700146 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
Pravin B Shelare298e502013-10-29 17:22:21 -0700147
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700148 if (stats) {
149 /* Local CPU may write on non-local stats, so we must
150 * block bottom-halves here.
151 */
152 spin_lock_bh(&stats->lock);
153 if (!*used || time_after(stats->used, *used))
154 *used = stats->used;
155 *tcp_flags |= stats->tcp_flags;
156 ovs_stats->n_packets += stats->packet_count;
157 ovs_stats->n_bytes += stats->byte_count;
158 spin_unlock_bh(&stats->lock);
159 }
Pravin B Shelare298e502013-10-29 17:22:21 -0700160 }
Pravin B Shelare298e502013-10-29 17:22:21 -0700161}
162
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700163/* Called with ovs_mutex. */
Pravin B Shelare298e502013-10-29 17:22:21 -0700164void ovs_flow_stats_clear(struct sw_flow *flow)
165{
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700166 int node;
Pravin B Shelare298e502013-10-29 17:22:21 -0700167
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700168 for_each_node(node) {
Jarno Rajahalme86ec8db2014-05-05 14:17:28 -0700169 struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
Jarno Rajahalme23dabf82014-03-27 12:35:23 -0700170
Jarno Rajahalme63e79592014-03-27 12:42:54 -0700171 if (stats) {
172 spin_lock_bh(&stats->lock);
173 stats->used = 0;
174 stats->packet_count = 0;
175 stats->byte_count = 0;
176 stats->tcp_flags = 0;
177 spin_unlock_bh(&stats->lock);
178 }
179 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700180}
181
Jesse Grossccb13522011-10-25 19:26:31 -0700182static int check_header(struct sk_buff *skb, int len)
183{
184 if (unlikely(skb->len < len))
185 return -EINVAL;
186 if (unlikely(!pskb_may_pull(skb, len)))
187 return -ENOMEM;
188 return 0;
189}
190
191static bool arphdr_ok(struct sk_buff *skb)
192{
193 return pskb_may_pull(skb, skb_network_offset(skb) +
194 sizeof(struct arp_eth_header));
195}
196
197static int check_iphdr(struct sk_buff *skb)
198{
199 unsigned int nh_ofs = skb_network_offset(skb);
200 unsigned int ip_len;
201 int err;
202
203 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
204 if (unlikely(err))
205 return err;
206
207 ip_len = ip_hdrlen(skb);
208 if (unlikely(ip_len < sizeof(struct iphdr) ||
209 skb->len < nh_ofs + ip_len))
210 return -EINVAL;
211
212 skb_set_transport_header(skb, nh_ofs + ip_len);
213 return 0;
214}
215
216static bool tcphdr_ok(struct sk_buff *skb)
217{
218 int th_ofs = skb_transport_offset(skb);
219 int tcp_len;
220
221 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
222 return false;
223
224 tcp_len = tcp_hdrlen(skb);
225 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
226 skb->len < th_ofs + tcp_len))
227 return false;
228
229 return true;
230}
231
232static bool udphdr_ok(struct sk_buff *skb)
233{
234 return pskb_may_pull(skb, skb_transport_offset(skb) +
235 sizeof(struct udphdr));
236}
237
Joe Stringera175a722013-08-22 12:30:48 -0700238static bool sctphdr_ok(struct sk_buff *skb)
239{
240 return pskb_may_pull(skb, skb_transport_offset(skb) +
241 sizeof(struct sctphdr));
242}
243
Jesse Grossccb13522011-10-25 19:26:31 -0700244static bool icmphdr_ok(struct sk_buff *skb)
245{
246 return pskb_may_pull(skb, skb_transport_offset(skb) +
247 sizeof(struct icmphdr));
248}
249
Andy Zhou03f0d912013-08-07 20:01:00 -0700250static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
Jesse Grossccb13522011-10-25 19:26:31 -0700251{
252 unsigned int nh_ofs = skb_network_offset(skb);
253 unsigned int nh_len;
254 int payload_ofs;
255 struct ipv6hdr *nh;
256 uint8_t nexthdr;
257 __be16 frag_off;
258 int err;
259
Jesse Grossccb13522011-10-25 19:26:31 -0700260 err = check_header(skb, nh_ofs + sizeof(*nh));
261 if (unlikely(err))
262 return err;
263
264 nh = ipv6_hdr(skb);
265 nexthdr = nh->nexthdr;
266 payload_ofs = (u8 *)(nh + 1) - skb->data;
267
268 key->ip.proto = NEXTHDR_NONE;
269 key->ip.tos = ipv6_get_dsfield(nh);
270 key->ip.ttl = nh->hop_limit;
271 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
272 key->ipv6.addr.src = nh->saddr;
273 key->ipv6.addr.dst = nh->daddr;
274
275 payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
Jesse Grossccb13522011-10-25 19:26:31 -0700276
277 if (frag_off) {
278 if (frag_off & htons(~0x7))
279 key->ip.frag = OVS_FRAG_TYPE_LATER;
280 else
281 key->ip.frag = OVS_FRAG_TYPE_FIRST;
Pravin B Shelar25ef1322014-10-17 13:56:31 -0700282 } else {
283 key->ip.frag = OVS_FRAG_TYPE_NONE;
Jesse Grossccb13522011-10-25 19:26:31 -0700284 }
285
Simon Hormanc30da492015-08-29 09:02:21 +0900286 /* Delayed handling of error in ipv6_skip_exthdr() as it
287 * always sets frag_off to a valid value which may be
288 * used to set key->ip.frag above.
289 */
290 if (unlikely(payload_ofs < 0))
291 return -EPROTO;
292
Jesse Grossccb13522011-10-25 19:26:31 -0700293 nh_len = payload_ofs - nh_ofs;
294 skb_set_transport_header(skb, nh_ofs + nh_len);
295 key->ip.proto = nexthdr;
296 return nh_len;
297}
298
299static bool icmp6hdr_ok(struct sk_buff *skb)
300{
301 return pskb_may_pull(skb, skb_transport_offset(skb) +
302 sizeof(struct icmp6hdr));
303}
304
Jesse Grossccb13522011-10-25 19:26:31 -0700305static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
306{
307 struct qtag_prefix {
308 __be16 eth_type; /* ETH_P_8021Q */
309 __be16 tci;
310 };
311 struct qtag_prefix *qp;
312
313 if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
314 return 0;
315
316 if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
317 sizeof(__be16))))
318 return -ENOMEM;
319
320 qp = (struct qtag_prefix *) skb->data;
321 key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
322 __skb_pull(skb, sizeof(struct qtag_prefix));
323
324 return 0;
325}
326
327static __be16 parse_ethertype(struct sk_buff *skb)
328{
329 struct llc_snap_hdr {
330 u8 dsap; /* Always 0xAA */
331 u8 ssap; /* Always 0xAA */
332 u8 ctrl;
333 u8 oui[3];
334 __be16 ethertype;
335 };
336 struct llc_snap_hdr *llc;
337 __be16 proto;
338
339 proto = *(__be16 *) skb->data;
340 __skb_pull(skb, sizeof(__be16));
341
Alexander Duyck6713fc92015-05-04 14:34:05 -0700342 if (eth_proto_is_802_3(proto))
Jesse Grossccb13522011-10-25 19:26:31 -0700343 return proto;
344
345 if (skb->len < sizeof(struct llc_snap_hdr))
346 return htons(ETH_P_802_2);
347
348 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
349 return htons(0);
350
351 llc = (struct llc_snap_hdr *) skb->data;
352 if (llc->dsap != LLC_SAP_SNAP ||
353 llc->ssap != LLC_SAP_SNAP ||
354 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
355 return htons(ETH_P_802_2);
356
357 __skb_pull(skb, sizeof(struct llc_snap_hdr));
Rich Lane17b682a2013-02-19 11:10:30 -0800358
Alexander Duyck6713fc92015-05-04 14:34:05 -0700359 if (eth_proto_is_802_3(llc->ethertype))
Rich Lane17b682a2013-02-19 11:10:30 -0800360 return llc->ethertype;
361
362 return htons(ETH_P_802_2);
Jesse Grossccb13522011-10-25 19:26:31 -0700363}
364
365static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
Andy Zhou03f0d912013-08-07 20:01:00 -0700366 int nh_len)
Jesse Grossccb13522011-10-25 19:26:31 -0700367{
368 struct icmp6hdr *icmp = icmp6_hdr(skb);
Jesse Grossccb13522011-10-25 19:26:31 -0700369
370 /* The ICMPv6 type and code fields use the 16-bit transport port
371 * fields, so we need to store them in 16-bit network byte order.
372 */
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700373 key->tp.src = htons(icmp->icmp6_type);
374 key->tp.dst = htons(icmp->icmp6_code);
Pravin B Shelar25ef1322014-10-17 13:56:31 -0700375 memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
Jesse Grossccb13522011-10-25 19:26:31 -0700376
377 if (icmp->icmp6_code == 0 &&
378 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
379 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
380 int icmp_len = skb->len - skb_transport_offset(skb);
381 struct nd_msg *nd;
382 int offset;
383
Jesse Grossccb13522011-10-25 19:26:31 -0700384 /* In order to process neighbor discovery options, we need the
385 * entire packet.
386 */
387 if (unlikely(icmp_len < sizeof(*nd)))
Andy Zhou03f0d912013-08-07 20:01:00 -0700388 return 0;
389
390 if (unlikely(skb_linearize(skb)))
391 return -ENOMEM;
Jesse Grossccb13522011-10-25 19:26:31 -0700392
393 nd = (struct nd_msg *)skb_transport_header(skb);
394 key->ipv6.nd.target = nd->target;
Jesse Grossccb13522011-10-25 19:26:31 -0700395
396 icmp_len -= sizeof(*nd);
397 offset = 0;
398 while (icmp_len >= 8) {
399 struct nd_opt_hdr *nd_opt =
400 (struct nd_opt_hdr *)(nd->opt + offset);
401 int opt_len = nd_opt->nd_opt_len * 8;
402
403 if (unlikely(!opt_len || opt_len > icmp_len))
Andy Zhou03f0d912013-08-07 20:01:00 -0700404 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700405
406 /* Store the link layer address if the appropriate
407 * option is provided. It is considered an error if
408 * the same link layer option is specified twice.
409 */
410 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
411 && opt_len == 8) {
412 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
413 goto invalid;
Joe Perches8c63ff02014-02-18 11:15:45 -0800414 ether_addr_copy(key->ipv6.nd.sll,
415 &nd->opt[offset+sizeof(*nd_opt)]);
Jesse Grossccb13522011-10-25 19:26:31 -0700416 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
417 && opt_len == 8) {
418 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
419 goto invalid;
Joe Perches8c63ff02014-02-18 11:15:45 -0800420 ether_addr_copy(key->ipv6.nd.tll,
421 &nd->opt[offset+sizeof(*nd_opt)]);
Jesse Grossccb13522011-10-25 19:26:31 -0700422 }
423
424 icmp_len -= opt_len;
425 offset += opt_len;
426 }
427 }
428
Andy Zhou03f0d912013-08-07 20:01:00 -0700429 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700430
431invalid:
432 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
433 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
434 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
435
Andy Zhou03f0d912013-08-07 20:01:00 -0700436 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700437}
438
439/**
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700440 * key_extract - extracts a flow key from an Ethernet frame.
Jesse Grossccb13522011-10-25 19:26:31 -0700441 * @skb: sk_buff that contains the frame, with skb->data pointing to the
442 * Ethernet header
Jesse Grossccb13522011-10-25 19:26:31 -0700443 * @key: output flow key
Jesse Grossccb13522011-10-25 19:26:31 -0700444 *
445 * The caller must ensure that skb->len >= ETH_HLEN.
446 *
447 * Returns 0 if successful, otherwise a negative errno value.
448 *
449 * Initializes @skb header pointers as follows:
450 *
451 * - skb->mac_header: the Ethernet header.
452 *
453 * - skb->network_header: just past the Ethernet header, or just past the
454 * VLAN header, to the first byte of the Ethernet payload.
455 *
Lorand Jakab34d94f22013-06-03 10:01:14 -0700456 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
Jesse Grossccb13522011-10-25 19:26:31 -0700457 * on output, then just past the IP header, if one is present and
458 * of a correct length, otherwise the same as skb->network_header.
Lorand Jakab34d94f22013-06-03 10:01:14 -0700459 * For other key->eth.type values it is left untouched.
Jesse Grossccb13522011-10-25 19:26:31 -0700460 */
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700461static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
Jesse Grossccb13522011-10-25 19:26:31 -0700462{
Andy Zhou03f0d912013-08-07 20:01:00 -0700463 int error;
Jesse Grossccb13522011-10-25 19:26:31 -0700464 struct ethhdr *eth;
465
Jesse Grossf5796682014-10-03 15:35:33 -0700466 /* Flags are always used as part of stats */
467 key->tp.flags = 0;
468
Jesse Grossccb13522011-10-25 19:26:31 -0700469 skb_reset_mac_header(skb);
470
471 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
472 * header in the linear data area.
473 */
474 eth = eth_hdr(skb);
Joe Perches8c63ff02014-02-18 11:15:45 -0800475 ether_addr_copy(key->eth.src, eth->h_source);
476 ether_addr_copy(key->eth.dst, eth->h_dest);
Jesse Grossccb13522011-10-25 19:26:31 -0700477
478 __skb_pull(skb, 2 * ETH_ALEN);
Pravin B Shelarb34df5e2013-06-13 11:11:44 -0700479 /* We are going to push all headers that we pull, so no need to
480 * update skb->csum here.
481 */
Jesse Grossccb13522011-10-25 19:26:31 -0700482
Jesse Gross07148122014-10-03 15:35:29 -0700483 key->eth.tci = 0;
Jiri Pirkodf8a39d2015-01-13 17:13:44 +0100484 if (skb_vlan_tag_present(skb))
Jesse Grossccb13522011-10-25 19:26:31 -0700485 key->eth.tci = htons(skb->vlan_tci);
486 else if (eth->h_proto == htons(ETH_P_8021Q))
487 if (unlikely(parse_vlan(skb, key)))
488 return -ENOMEM;
489
490 key->eth.type = parse_ethertype(skb);
491 if (unlikely(key->eth.type == htons(0)))
492 return -ENOMEM;
493
494 skb_reset_network_header(skb);
Simon Horman25cd9ba2014-10-06 05:05:13 -0700495 skb_reset_mac_len(skb);
Jesse Grossccb13522011-10-25 19:26:31 -0700496 __skb_push(skb, skb->data - skb_mac_header(skb));
497
498 /* Network layer. */
499 if (key->eth.type == htons(ETH_P_IP)) {
500 struct iphdr *nh;
501 __be16 offset;
502
Jesse Grossccb13522011-10-25 19:26:31 -0700503 error = check_iphdr(skb);
504 if (unlikely(error)) {
Jesse Gross07148122014-10-03 15:35:29 -0700505 memset(&key->ip, 0, sizeof(key->ip));
506 memset(&key->ipv4, 0, sizeof(key->ipv4));
Jesse Grossccb13522011-10-25 19:26:31 -0700507 if (error == -EINVAL) {
508 skb->transport_header = skb->network_header;
509 error = 0;
510 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700511 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700512 }
513
514 nh = ip_hdr(skb);
515 key->ipv4.addr.src = nh->saddr;
516 key->ipv4.addr.dst = nh->daddr;
517
518 key->ip.proto = nh->protocol;
519 key->ip.tos = nh->tos;
520 key->ip.ttl = nh->ttl;
521
522 offset = nh->frag_off & htons(IP_OFFSET);
523 if (offset) {
524 key->ip.frag = OVS_FRAG_TYPE_LATER;
Andy Zhou03f0d912013-08-07 20:01:00 -0700525 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700526 }
527 if (nh->frag_off & htons(IP_MF) ||
Jesse Gross07148122014-10-03 15:35:29 -0700528 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
Jesse Grossccb13522011-10-25 19:26:31 -0700529 key->ip.frag = OVS_FRAG_TYPE_FIRST;
Jesse Gross07148122014-10-03 15:35:29 -0700530 else
531 key->ip.frag = OVS_FRAG_TYPE_NONE;
Jesse Grossccb13522011-10-25 19:26:31 -0700532
533 /* Transport layer. */
534 if (key->ip.proto == IPPROTO_TCP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700535 if (tcphdr_ok(skb)) {
536 struct tcphdr *tcp = tcp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700537 key->tp.src = tcp->source;
538 key->tp.dst = tcp->dest;
539 key->tp.flags = TCP_FLAGS_BE16(tcp);
Jesse Gross07148122014-10-03 15:35:29 -0700540 } else {
541 memset(&key->tp, 0, sizeof(key->tp));
Jesse Grossccb13522011-10-25 19:26:31 -0700542 }
Jesse Gross07148122014-10-03 15:35:29 -0700543
Jesse Grossccb13522011-10-25 19:26:31 -0700544 } else if (key->ip.proto == IPPROTO_UDP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700545 if (udphdr_ok(skb)) {
546 struct udphdr *udp = udp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700547 key->tp.src = udp->source;
548 key->tp.dst = udp->dest;
Jesse Gross07148122014-10-03 15:35:29 -0700549 } else {
550 memset(&key->tp, 0, sizeof(key->tp));
Jesse Grossccb13522011-10-25 19:26:31 -0700551 }
Joe Stringera175a722013-08-22 12:30:48 -0700552 } else if (key->ip.proto == IPPROTO_SCTP) {
553 if (sctphdr_ok(skb)) {
554 struct sctphdr *sctp = sctp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700555 key->tp.src = sctp->source;
556 key->tp.dst = sctp->dest;
Jesse Gross07148122014-10-03 15:35:29 -0700557 } else {
558 memset(&key->tp, 0, sizeof(key->tp));
Joe Stringera175a722013-08-22 12:30:48 -0700559 }
Jesse Grossccb13522011-10-25 19:26:31 -0700560 } else if (key->ip.proto == IPPROTO_ICMP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700561 if (icmphdr_ok(skb)) {
562 struct icmphdr *icmp = icmp_hdr(skb);
563 /* The ICMP type and code fields use the 16-bit
564 * transport port fields, so we need to store
565 * them in 16-bit network byte order. */
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700566 key->tp.src = htons(icmp->type);
567 key->tp.dst = htons(icmp->code);
Jesse Gross07148122014-10-03 15:35:29 -0700568 } else {
569 memset(&key->tp, 0, sizeof(key->tp));
Jesse Grossccb13522011-10-25 19:26:31 -0700570 }
571 }
572
Jesse Gross07148122014-10-03 15:35:29 -0700573 } else if (key->eth.type == htons(ETH_P_ARP) ||
574 key->eth.type == htons(ETH_P_RARP)) {
Jesse Grossccb13522011-10-25 19:26:31 -0700575 struct arp_eth_header *arp;
Li RongQing389f4892014-10-17 14:03:08 +0800576 bool arp_available = arphdr_ok(skb);
Jesse Grossccb13522011-10-25 19:26:31 -0700577
578 arp = (struct arp_eth_header *)skb_network_header(skb);
579
Li RongQing389f4892014-10-17 14:03:08 +0800580 if (arp_available &&
Jesse Gross07148122014-10-03 15:35:29 -0700581 arp->ar_hrd == htons(ARPHRD_ETHER) &&
582 arp->ar_pro == htons(ETH_P_IP) &&
583 arp->ar_hln == ETH_ALEN &&
584 arp->ar_pln == 4) {
Jesse Grossccb13522011-10-25 19:26:31 -0700585
586 /* We only match on the lower 8 bits of the opcode. */
587 if (ntohs(arp->ar_op) <= 0xff)
588 key->ip.proto = ntohs(arp->ar_op);
Jesse Gross07148122014-10-03 15:35:29 -0700589 else
590 key->ip.proto = 0;
591
Mehak Mahajand04d3822012-10-30 15:50:28 -0700592 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
593 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
Joe Perches8c63ff02014-02-18 11:15:45 -0800594 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
595 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
Jesse Gross07148122014-10-03 15:35:29 -0700596 } else {
597 memset(&key->ip, 0, sizeof(key->ip));
598 memset(&key->ipv4, 0, sizeof(key->ipv4));
Jesse Grossccb13522011-10-25 19:26:31 -0700599 }
Simon Horman25cd9ba2014-10-06 05:05:13 -0700600 } else if (eth_p_mpls(key->eth.type)) {
601 size_t stack_len = MPLS_HLEN;
602
603 /* In the presence of an MPLS label stack the end of the L2
604 * header and the beginning of the L3 header differ.
605 *
606 * Advance network_header to the beginning of the L3
607 * header. mac_len corresponds to the end of the L2 header.
608 */
609 while (1) {
610 __be32 lse;
611
612 error = check_header(skb, skb->mac_len + stack_len);
613 if (unlikely(error))
614 return 0;
615
616 memcpy(&lse, skb_network_header(skb), MPLS_HLEN);
617
618 if (stack_len == MPLS_HLEN)
619 memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN);
620
621 skb_set_network_header(skb, skb->mac_len + stack_len);
622 if (lse & htonl(MPLS_LS_S_MASK))
623 break;
624
625 stack_len += MPLS_HLEN;
626 }
Jesse Grossccb13522011-10-25 19:26:31 -0700627 } else if (key->eth.type == htons(ETH_P_IPV6)) {
628 int nh_len; /* IPv6 Header + Extensions */
629
Andy Zhou03f0d912013-08-07 20:01:00 -0700630 nh_len = parse_ipv6hdr(skb, key);
Jesse Grossccb13522011-10-25 19:26:31 -0700631 if (unlikely(nh_len < 0)) {
Simon Hormanc30da492015-08-29 09:02:21 +0900632 switch (nh_len) {
633 case -EINVAL:
634 memset(&key->ip, 0, sizeof(key->ip));
635 memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
636 /* fall-through */
637 case -EPROTO:
Jesse Grossccb13522011-10-25 19:26:31 -0700638 skb->transport_header = skb->network_header;
Andy Zhou03f0d912013-08-07 20:01:00 -0700639 error = 0;
Simon Hormanc30da492015-08-29 09:02:21 +0900640 break;
641 default:
Jesse Grossccb13522011-10-25 19:26:31 -0700642 error = nh_len;
Andy Zhou03f0d912013-08-07 20:01:00 -0700643 }
644 return error;
Jesse Grossccb13522011-10-25 19:26:31 -0700645 }
646
647 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
Andy Zhou03f0d912013-08-07 20:01:00 -0700648 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700649 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
650 key->ip.frag = OVS_FRAG_TYPE_FIRST;
651
652 /* Transport layer. */
653 if (key->ip.proto == NEXTHDR_TCP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700654 if (tcphdr_ok(skb)) {
655 struct tcphdr *tcp = tcp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700656 key->tp.src = tcp->source;
657 key->tp.dst = tcp->dest;
658 key->tp.flags = TCP_FLAGS_BE16(tcp);
Jesse Gross07148122014-10-03 15:35:29 -0700659 } else {
660 memset(&key->tp, 0, sizeof(key->tp));
Jesse Grossccb13522011-10-25 19:26:31 -0700661 }
662 } else if (key->ip.proto == NEXTHDR_UDP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700663 if (udphdr_ok(skb)) {
664 struct udphdr *udp = udp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700665 key->tp.src = udp->source;
666 key->tp.dst = udp->dest;
Jesse Gross07148122014-10-03 15:35:29 -0700667 } else {
668 memset(&key->tp, 0, sizeof(key->tp));
Jesse Grossccb13522011-10-25 19:26:31 -0700669 }
Joe Stringera175a722013-08-22 12:30:48 -0700670 } else if (key->ip.proto == NEXTHDR_SCTP) {
671 if (sctphdr_ok(skb)) {
672 struct sctphdr *sctp = sctp_hdr(skb);
Jarno Rajahalme1139e242014-05-05 09:54:49 -0700673 key->tp.src = sctp->source;
674 key->tp.dst = sctp->dest;
Jesse Gross07148122014-10-03 15:35:29 -0700675 } else {
676 memset(&key->tp, 0, sizeof(key->tp));
Joe Stringera175a722013-08-22 12:30:48 -0700677 }
Jesse Grossccb13522011-10-25 19:26:31 -0700678 } else if (key->ip.proto == NEXTHDR_ICMP) {
Jesse Grossccb13522011-10-25 19:26:31 -0700679 if (icmp6hdr_ok(skb)) {
Andy Zhou03f0d912013-08-07 20:01:00 -0700680 error = parse_icmpv6(skb, key, nh_len);
681 if (error)
682 return error;
Jesse Gross07148122014-10-03 15:35:29 -0700683 } else {
684 memset(&key->tp, 0, sizeof(key->tp));
Jesse Grossccb13522011-10-25 19:26:31 -0700685 }
686 }
687 }
Andy Zhou03f0d912013-08-07 20:01:00 -0700688 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700689}
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700690
Andy Zhou971427f32014-09-15 19:37:25 -0700691int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
692{
693 return key_extract(skb, key);
694}
695
Thomas Graf1d8fff92015-07-21 10:43:54 +0200696int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
Pravin B Shelar8c8b1b82014-09-15 19:28:44 -0700697 struct sk_buff *skb, struct sw_flow_key *key)
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700698{
699 /* Extract metadata from packet. */
Jesse Grossf5796682014-10-03 15:35:33 -0700700 if (tun_info) {
Jiri Benc00a93ba2015-10-05 13:09:46 +0200701 key->tun_proto = ip_tunnel_info_af(tun_info);
Thomas Graf1d8fff92015-07-21 10:43:54 +0200702 memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
Jesse Grossf5796682014-10-03 15:35:33 -0700703
Pravin B Shelar4c222792015-08-30 18:09:38 -0700704 if (tun_info->options_len) {
Jesse Grossf5796682014-10-03 15:35:33 -0700705 BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
706 8)) - 1
707 > sizeof(key->tun_opts));
Pravin B Shelar4c222792015-08-30 18:09:38 -0700708
709 ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
710 tun_info);
Jesse Grossf5796682014-10-03 15:35:33 -0700711 key->tun_opts_len = tun_info->options_len;
712 } else {
713 key->tun_opts_len = 0;
714 }
715 } else {
Jiri Benc00a93ba2015-10-05 13:09:46 +0200716 key->tun_proto = 0;
Jesse Grossf5796682014-10-03 15:35:33 -0700717 key->tun_opts_len = 0;
Jesse Gross07148122014-10-03 15:35:29 -0700718 memset(&key->tun_key, 0, sizeof(key->tun_key));
Jesse Grossf5796682014-10-03 15:35:33 -0700719 }
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700720
721 key->phy.priority = skb->priority;
722 key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
723 key->phy.skb_mark = skb->mark;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700724 ovs_ct_fill_key(skb, key);
Jesse Gross07148122014-10-03 15:35:29 -0700725 key->ovs_flow_hash = 0;
726 key->recirc_id = 0;
727
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700728 return key_extract(skb, key);
729}
730
Joe Stringerc2ac6672015-08-26 11:31:52 -0700731int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700732 struct sk_buff *skb,
Jarno Rajahalme05da5892014-11-06 07:03:05 -0800733 struct sw_flow_key *key, bool log)
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700734{
735 int err;
736
Pravin B Shelarb35725a2015-02-10 13:35:16 -0800737 memset(key, 0, OVS_SW_FLOW_KEY_METADATA_SIZE);
738
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700739 /* Extract metadata from netlink attributes. */
Joe Stringerc2ac6672015-08-26 11:31:52 -0700740 err = ovs_nla_get_flow_metadata(net, attr, key, log);
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700741 if (err)
742 return err;
743
744 return key_extract(skb, key);
745}