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ccb1352e 1/*
971427f3 2 * Copyright (c) 2007-2014 Nicira, Inc.
ccb1352e
JG
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/skbuff.h>
22#include <linux/in.h>
23#include <linux/ip.h>
24#include <linux/openvswitch.h>
a175a723 25#include <linux/sctp.h>
ccb1352e
JG
26#include <linux/tcp.h>
27#include <linux/udp.h>
28#include <linux/in6.h>
29#include <linux/if_arp.h>
30#include <linux/if_vlan.h>
31#include <net/ip.h>
3fdbd1ce 32#include <net/ipv6.h>
ccb1352e
JG
33#include <net/checksum.h>
34#include <net/dsfield.h>
a175a723 35#include <net/sctp/checksum.h>
ccb1352e
JG
36
37#include "datapath.h"
971427f3 38#include "flow.h"
ccb1352e
JG
39#include "vport.h"
40
41static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
2ff3e4e4 42 struct sw_flow_key *key,
651887b0 43 const struct nlattr *attr, int len);
ccb1352e 44
971427f3
AZ
45struct deferred_action {
46 struct sk_buff *skb;
47 const struct nlattr *actions;
48
49 /* Store pkt_key clone when creating deferred action. */
50 struct sw_flow_key pkt_key;
51};
52
53#define DEFERRED_ACTION_FIFO_SIZE 10
54struct action_fifo {
55 int head;
56 int tail;
57 /* Deferred action fifo queue storage. */
58 struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
59};
60
61static struct action_fifo __percpu *action_fifos;
62static DEFINE_PER_CPU(int, exec_actions_level);
63
64static void action_fifo_init(struct action_fifo *fifo)
65{
66 fifo->head = 0;
67 fifo->tail = 0;
68}
69
70static bool action_fifo_is_empty(struct action_fifo *fifo)
71{
72 return (fifo->head == fifo->tail);
73}
74
75static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
76{
77 if (action_fifo_is_empty(fifo))
78 return NULL;
79
80 return &fifo->fifo[fifo->tail++];
81}
82
83static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
84{
85 if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
86 return NULL;
87
88 return &fifo->fifo[fifo->head++];
89}
90
91/* Return true if fifo is not full */
92static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
93 struct sw_flow_key *key,
94 const struct nlattr *attr)
95{
96 struct action_fifo *fifo;
97 struct deferred_action *da;
98
99 fifo = this_cpu_ptr(action_fifos);
100 da = action_fifo_put(fifo);
101 if (da) {
102 da->skb = skb;
103 da->actions = attr;
104 da->pkt_key = *key;
105 }
106
107 return da;
108}
109
ccb1352e
JG
110static int make_writable(struct sk_buff *skb, int write_len)
111{
2ba5af42
JB
112 if (!pskb_may_pull(skb, write_len))
113 return -ENOMEM;
114
ccb1352e
JG
115 if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
116 return 0;
117
118 return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
119}
120
39855b5b 121/* remove VLAN header from packet and update csum accordingly. */
ccb1352e
JG
122static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
123{
124 struct vlan_hdr *vhdr;
125 int err;
126
127 err = make_writable(skb, VLAN_ETH_HLEN);
128 if (unlikely(err))
129 return err;
130
131 if (skb->ip_summed == CHECKSUM_COMPLETE)
132 skb->csum = csum_sub(skb->csum, csum_partial(skb->data
7b024082 133 + (2 * ETH_ALEN), VLAN_HLEN, 0));
ccb1352e
JG
134
135 vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);
136 *current_tci = vhdr->h_vlan_TCI;
137
138 memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN);
139 __skb_pull(skb, VLAN_HLEN);
140
141 vlan_set_encap_proto(skb, vhdr);
142 skb->mac_header += VLAN_HLEN;
2ba5af42
JB
143 if (skb_network_offset(skb) < ETH_HLEN)
144 skb_set_network_header(skb, ETH_HLEN);
ccb1352e
JG
145 skb_reset_mac_len(skb);
146
147 return 0;
148}
149
150static int pop_vlan(struct sk_buff *skb)
151{
152 __be16 tci;
153 int err;
154
155 if (likely(vlan_tx_tag_present(skb))) {
156 skb->vlan_tci = 0;
157 } else {
158 if (unlikely(skb->protocol != htons(ETH_P_8021Q) ||
159 skb->len < VLAN_ETH_HLEN))
160 return 0;
161
162 err = __pop_vlan_tci(skb, &tci);
163 if (err)
164 return err;
165 }
166 /* move next vlan tag to hw accel tag */
167 if (likely(skb->protocol != htons(ETH_P_8021Q) ||
168 skb->len < VLAN_ETH_HLEN))
169 return 0;
170
171 err = __pop_vlan_tci(skb, &tci);
172 if (unlikely(err))
173 return err;
174
86a9bad3 175 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci));
ccb1352e
JG
176 return 0;
177}
178
179static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan)
180{
181 if (unlikely(vlan_tx_tag_present(skb))) {
182 u16 current_tag;
183
184 /* push down current VLAN tag */
185 current_tag = vlan_tx_tag_get(skb);
186
86a9bad3 187 if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag))
ccb1352e
JG
188 return -ENOMEM;
189
190 if (skb->ip_summed == CHECKSUM_COMPLETE)
191 skb->csum = csum_add(skb->csum, csum_partial(skb->data
7b024082 192 + (2 * ETH_ALEN), VLAN_HLEN, 0));
ccb1352e
JG
193
194 }
86a9bad3 195 __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
ccb1352e
JG
196 return 0;
197}
198
199static int set_eth_addr(struct sk_buff *skb,
200 const struct ovs_key_ethernet *eth_key)
201{
202 int err;
203 err = make_writable(skb, ETH_HLEN);
204 if (unlikely(err))
205 return err;
206
b34df5e8
PS
207 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
208
8c63ff09
JP
209 ether_addr_copy(eth_hdr(skb)->h_source, eth_key->eth_src);
210 ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst);
ccb1352e 211
b34df5e8
PS
212 ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
213
ccb1352e
JG
214 return 0;
215}
216
217static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
218 __be32 *addr, __be32 new_addr)
219{
220 int transport_len = skb->len - skb_transport_offset(skb);
221
222 if (nh->protocol == IPPROTO_TCP) {
223 if (likely(transport_len >= sizeof(struct tcphdr)))
224 inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
225 *addr, new_addr, 1);
226 } else if (nh->protocol == IPPROTO_UDP) {
81e5d41d
JG
227 if (likely(transport_len >= sizeof(struct udphdr))) {
228 struct udphdr *uh = udp_hdr(skb);
229
230 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
231 inet_proto_csum_replace4(&uh->check, skb,
232 *addr, new_addr, 1);
233 if (!uh->check)
234 uh->check = CSUM_MANGLED_0;
235 }
236 }
ccb1352e
JG
237 }
238
239 csum_replace4(&nh->check, *addr, new_addr);
7539fadc 240 skb_clear_hash(skb);
ccb1352e
JG
241 *addr = new_addr;
242}
243
3fdbd1ce
AA
244static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
245 __be32 addr[4], const __be32 new_addr[4])
246{
247 int transport_len = skb->len - skb_transport_offset(skb);
248
249 if (l4_proto == IPPROTO_TCP) {
250 if (likely(transport_len >= sizeof(struct tcphdr)))
251 inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
252 addr, new_addr, 1);
253 } else if (l4_proto == IPPROTO_UDP) {
254 if (likely(transport_len >= sizeof(struct udphdr))) {
255 struct udphdr *uh = udp_hdr(skb);
256
257 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
258 inet_proto_csum_replace16(&uh->check, skb,
259 addr, new_addr, 1);
260 if (!uh->check)
261 uh->check = CSUM_MANGLED_0;
262 }
263 }
264 }
265}
266
267static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
268 __be32 addr[4], const __be32 new_addr[4],
269 bool recalculate_csum)
270{
271 if (recalculate_csum)
272 update_ipv6_checksum(skb, l4_proto, addr, new_addr);
273
7539fadc 274 skb_clear_hash(skb);
3fdbd1ce
AA
275 memcpy(addr, new_addr, sizeof(__be32[4]));
276}
277
278static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc)
279{
280 nh->priority = tc >> 4;
281 nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4);
282}
283
284static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl)
285{
286 nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16;
287 nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8;
288 nh->flow_lbl[2] = fl & 0x000000FF;
289}
290
ccb1352e
JG
291static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl)
292{
293 csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
294 nh->ttl = new_ttl;
295}
296
297static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
298{
299 struct iphdr *nh;
300 int err;
301
302 err = make_writable(skb, skb_network_offset(skb) +
303 sizeof(struct iphdr));
304 if (unlikely(err))
305 return err;
306
307 nh = ip_hdr(skb);
308
309 if (ipv4_key->ipv4_src != nh->saddr)
310 set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src);
311
312 if (ipv4_key->ipv4_dst != nh->daddr)
313 set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst);
314
315 if (ipv4_key->ipv4_tos != nh->tos)
316 ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos);
317
318 if (ipv4_key->ipv4_ttl != nh->ttl)
319 set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl);
320
321 return 0;
322}
323
3fdbd1ce
AA
324static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)
325{
326 struct ipv6hdr *nh;
327 int err;
328 __be32 *saddr;
329 __be32 *daddr;
330
331 err = make_writable(skb, skb_network_offset(skb) +
332 sizeof(struct ipv6hdr));
333 if (unlikely(err))
334 return err;
335
336 nh = ipv6_hdr(skb);
337 saddr = (__be32 *)&nh->saddr;
338 daddr = (__be32 *)&nh->daddr;
339
340 if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src)))
341 set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr,
342 ipv6_key->ipv6_src, true);
343
344 if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) {
345 unsigned int offset = 0;
346 int flags = IP6_FH_F_SKIP_RH;
347 bool recalc_csum = true;
348
349 if (ipv6_ext_hdr(nh->nexthdr))
350 recalc_csum = ipv6_find_hdr(skb, &offset,
351 NEXTHDR_ROUTING, NULL,
352 &flags) != NEXTHDR_ROUTING;
353
354 set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr,
355 ipv6_key->ipv6_dst, recalc_csum);
356 }
357
358 set_ipv6_tc(nh, ipv6_key->ipv6_tclass);
359 set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label));
360 nh->hop_limit = ipv6_key->ipv6_hlimit;
361
362 return 0;
363}
364
ccb1352e
JG
365/* Must follow make_writable() since that can move the skb data. */
366static void set_tp_port(struct sk_buff *skb, __be16 *port,
367 __be16 new_port, __sum16 *check)
368{
369 inet_proto_csum_replace2(check, skb, *port, new_port, 0);
370 *port = new_port;
7539fadc 371 skb_clear_hash(skb);
ccb1352e
JG
372}
373
81e5d41d
JG
374static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port)
375{
376 struct udphdr *uh = udp_hdr(skb);
377
378 if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
379 set_tp_port(skb, port, new_port, &uh->check);
380
381 if (!uh->check)
382 uh->check = CSUM_MANGLED_0;
383 } else {
384 *port = new_port;
7539fadc 385 skb_clear_hash(skb);
81e5d41d
JG
386 }
387}
388
389static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key)
ccb1352e
JG
390{
391 struct udphdr *uh;
392 int err;
393
394 err = make_writable(skb, skb_transport_offset(skb) +
395 sizeof(struct udphdr));
396 if (unlikely(err))
397 return err;
398
399 uh = udp_hdr(skb);
400 if (udp_port_key->udp_src != uh->source)
81e5d41d 401 set_udp_port(skb, &uh->source, udp_port_key->udp_src);
ccb1352e
JG
402
403 if (udp_port_key->udp_dst != uh->dest)
81e5d41d 404 set_udp_port(skb, &uh->dest, udp_port_key->udp_dst);
ccb1352e
JG
405
406 return 0;
407}
408
81e5d41d 409static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key)
ccb1352e
JG
410{
411 struct tcphdr *th;
412 int err;
413
414 err = make_writable(skb, skb_transport_offset(skb) +
415 sizeof(struct tcphdr));
416 if (unlikely(err))
417 return err;
418
419 th = tcp_hdr(skb);
420 if (tcp_port_key->tcp_src != th->source)
421 set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check);
422
423 if (tcp_port_key->tcp_dst != th->dest)
424 set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check);
425
426 return 0;
427}
428
a175a723
JS
429static int set_sctp(struct sk_buff *skb,
430 const struct ovs_key_sctp *sctp_port_key)
431{
432 struct sctphdr *sh;
433 int err;
434 unsigned int sctphoff = skb_transport_offset(skb);
435
436 err = make_writable(skb, sctphoff + sizeof(struct sctphdr));
437 if (unlikely(err))
438 return err;
439
440 sh = sctp_hdr(skb);
441 if (sctp_port_key->sctp_src != sh->source ||
442 sctp_port_key->sctp_dst != sh->dest) {
443 __le32 old_correct_csum, new_csum, old_csum;
444
445 old_csum = sh->checksum;
446 old_correct_csum = sctp_compute_cksum(skb, sctphoff);
447
448 sh->source = sctp_port_key->sctp_src;
449 sh->dest = sctp_port_key->sctp_dst;
450
451 new_csum = sctp_compute_cksum(skb, sctphoff);
452
453 /* Carry any checksum errors through. */
454 sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
455
7539fadc 456 skb_clear_hash(skb);
a175a723
JS
457 }
458
459 return 0;
460}
461
ccb1352e
JG
462static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
463{
464 struct vport *vport;
465
466 if (unlikely(!skb))
467 return -ENOMEM;
468
15eac2a7 469 vport = ovs_vport_rcu(dp, out_port);
ccb1352e
JG
470 if (unlikely(!vport)) {
471 kfree_skb(skb);
472 return -ENODEV;
473 }
474
475 ovs_vport_send(vport, skb);
476 return 0;
477}
478
479static int output_userspace(struct datapath *dp, struct sk_buff *skb,
2ff3e4e4 480 struct sw_flow_key *key, const struct nlattr *attr)
ccb1352e
JG
481{
482 struct dp_upcall_info upcall;
483 const struct nlattr *a;
484 int rem;
485
486 upcall.cmd = OVS_PACKET_CMD_ACTION;
2ff3e4e4 487 upcall.key = key;
ccb1352e 488 upcall.userdata = NULL;
15e47304 489 upcall.portid = 0;
ccb1352e
JG
490
491 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
492 a = nla_next(a, &rem)) {
493 switch (nla_type(a)) {
494 case OVS_USERSPACE_ATTR_USERDATA:
495 upcall.userdata = a;
496 break;
497
498 case OVS_USERSPACE_ATTR_PID:
15e47304 499 upcall.portid = nla_get_u32(a);
ccb1352e
JG
500 break;
501 }
502 }
503
504 return ovs_dp_upcall(dp, skb, &upcall);
505}
506
651887b0
SH
507static bool last_action(const struct nlattr *a, int rem)
508{
509 return a->nla_len == rem;
510}
511
ccb1352e 512static int sample(struct datapath *dp, struct sk_buff *skb,
2ff3e4e4 513 struct sw_flow_key *key, const struct nlattr *attr)
ccb1352e
JG
514{
515 const struct nlattr *acts_list = NULL;
516 const struct nlattr *a;
517 int rem;
518
519 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
520 a = nla_next(a, &rem)) {
521 switch (nla_type(a)) {
522 case OVS_SAMPLE_ATTR_PROBABILITY:
63862b5b 523 if (prandom_u32() >= nla_get_u32(a))
ccb1352e
JG
524 return 0;
525 break;
526
527 case OVS_SAMPLE_ATTR_ACTIONS:
528 acts_list = a;
529 break;
530 }
531 }
532
651887b0
SH
533 rem = nla_len(acts_list);
534 a = nla_data(acts_list);
535
32ae87ff
AZ
536 /* Actions list is empty, do nothing */
537 if (unlikely(!rem))
538 return 0;
651887b0 539
32ae87ff
AZ
540 /* The only known usage of sample action is having a single user-space
541 * action. Treat this usage as a special case.
542 * The output_userspace() should clone the skb to be sent to the
543 * user space. This skb will be consumed by its caller.
651887b0 544 */
32ae87ff
AZ
545 if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
546 last_action(a, rem)))
547 return output_userspace(dp, skb, key, a);
548
549 skb = skb_clone(skb, GFP_ATOMIC);
550 if (!skb)
551 /* Skip the sample action when out of memory. */
552 return 0;
553
971427f3
AZ
554 if (!add_deferred_actions(skb, key, a)) {
555 if (net_ratelimit())
556 pr_warn("%s: deferred actions limit reached, dropping sample action\n",
557 ovs_dp_name(dp));
558
559 kfree_skb(skb);
560 }
561 return 0;
562}
563
564static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
565 const struct nlattr *attr)
566{
567 struct ovs_action_hash *hash_act = nla_data(attr);
568 u32 hash = 0;
569
570 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
571 hash = skb_get_hash(skb);
572 hash = jhash_1word(hash, hash_act->hash_basis);
573 if (!hash)
574 hash = 0x1;
575
576 key->ovs_flow_hash = hash;
ccb1352e
JG
577}
578
579static int execute_set_action(struct sk_buff *skb,
580 const struct nlattr *nested_attr)
581{
582 int err = 0;
583
584 switch (nla_type(nested_attr)) {
585 case OVS_KEY_ATTR_PRIORITY:
586 skb->priority = nla_get_u32(nested_attr);
587 break;
588
39c7caeb
AA
589 case OVS_KEY_ATTR_SKB_MARK:
590 skb->mark = nla_get_u32(nested_attr);
591 break;
592
f0b128c1
JG
593 case OVS_KEY_ATTR_TUNNEL_INFO:
594 OVS_CB(skb)->egress_tun_info = nla_data(nested_attr);
7d5437c7
PS
595 break;
596
ccb1352e
JG
597 case OVS_KEY_ATTR_ETHERNET:
598 err = set_eth_addr(skb, nla_data(nested_attr));
599 break;
600
601 case OVS_KEY_ATTR_IPV4:
602 err = set_ipv4(skb, nla_data(nested_attr));
603 break;
604
3fdbd1ce
AA
605 case OVS_KEY_ATTR_IPV6:
606 err = set_ipv6(skb, nla_data(nested_attr));
607 break;
608
ccb1352e 609 case OVS_KEY_ATTR_TCP:
81e5d41d 610 err = set_tcp(skb, nla_data(nested_attr));
ccb1352e
JG
611 break;
612
613 case OVS_KEY_ATTR_UDP:
81e5d41d 614 err = set_udp(skb, nla_data(nested_attr));
ccb1352e 615 break;
a175a723
JS
616
617 case OVS_KEY_ATTR_SCTP:
618 err = set_sctp(skb, nla_data(nested_attr));
619 break;
ccb1352e
JG
620 }
621
622 return err;
623}
624
971427f3
AZ
625static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
626 struct sw_flow_key *key,
627 const struct nlattr *a, int rem)
628{
629 struct deferred_action *da;
630 int err;
631
632 err = ovs_flow_key_update(skb, key);
633 if (err)
634 return err;
635
636 if (!last_action(a, rem)) {
637 /* Recirc action is the not the last action
638 * of the action list, need to clone the skb.
639 */
640 skb = skb_clone(skb, GFP_ATOMIC);
641
642 /* Skip the recirc action when out of memory, but
643 * continue on with the rest of the action list.
644 */
645 if (!skb)
646 return 0;
647 }
648
649 da = add_deferred_actions(skb, key, NULL);
650 if (da) {
651 da->pkt_key.recirc_id = nla_get_u32(a);
652 } else {
653 kfree_skb(skb);
654
655 if (net_ratelimit())
656 pr_warn("%s: deferred action limit reached, drop recirc action\n",
657 ovs_dp_name(dp));
658 }
659
660 return 0;
661}
662
ccb1352e
JG
663/* Execute a list of actions against 'skb'. */
664static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
2ff3e4e4 665 struct sw_flow_key *key,
651887b0 666 const struct nlattr *attr, int len)
ccb1352e
JG
667{
668 /* Every output action needs a separate clone of 'skb', but the common
669 * case is just a single output action, so that doing a clone and
670 * then freeing the original skbuff is wasteful. So the following code
671 * is slightly obscure just to avoid that. */
672 int prev_port = -1;
673 const struct nlattr *a;
674 int rem;
675
676 for (a = attr, rem = len; rem > 0;
677 a = nla_next(a, &rem)) {
678 int err = 0;
679
680 if (prev_port != -1) {
681 do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port);
682 prev_port = -1;
683 }
684
685 switch (nla_type(a)) {
686 case OVS_ACTION_ATTR_OUTPUT:
687 prev_port = nla_get_u32(a);
688 break;
689
690 case OVS_ACTION_ATTR_USERSPACE:
2ff3e4e4 691 output_userspace(dp, skb, key, a);
ccb1352e
JG
692 break;
693
971427f3
AZ
694 case OVS_ACTION_ATTR_HASH:
695 execute_hash(skb, key, a);
696 break;
697
ccb1352e
JG
698 case OVS_ACTION_ATTR_PUSH_VLAN:
699 err = push_vlan(skb, nla_data(a));
700 if (unlikely(err)) /* skb already freed. */
701 return err;
702 break;
703
704 case OVS_ACTION_ATTR_POP_VLAN:
705 err = pop_vlan(skb);
706 break;
707
971427f3
AZ
708 case OVS_ACTION_ATTR_RECIRC:
709 err = execute_recirc(dp, skb, key, a, rem);
710 if (last_action(a, rem)) {
711 /* If this is the last action, the skb has
712 * been consumed or freed.
713 * Return immediately.
714 */
715 return err;
716 }
717 break;
718
ccb1352e
JG
719 case OVS_ACTION_ATTR_SET:
720 err = execute_set_action(skb, nla_data(a));
721 break;
722
723 case OVS_ACTION_ATTR_SAMPLE:
2ff3e4e4 724 err = sample(dp, skb, key, a);
fe984c08
AZ
725 if (unlikely(err)) /* skb already freed. */
726 return err;
ccb1352e
JG
727 break;
728 }
729
730 if (unlikely(err)) {
731 kfree_skb(skb);
732 return err;
733 }
734 }
735
651887b0 736 if (prev_port != -1)
ccb1352e 737 do_output(dp, skb, prev_port);
651887b0 738 else
ccb1352e
JG
739 consume_skb(skb);
740
741 return 0;
742}
743
971427f3
AZ
744static void process_deferred_actions(struct datapath *dp)
745{
746 struct action_fifo *fifo = this_cpu_ptr(action_fifos);
747
748 /* Do not touch the FIFO in case there is no deferred actions. */
749 if (action_fifo_is_empty(fifo))
750 return;
751
752 /* Finishing executing all deferred actions. */
753 do {
754 struct deferred_action *da = action_fifo_get(fifo);
755 struct sk_buff *skb = da->skb;
756 struct sw_flow_key *key = &da->pkt_key;
757 const struct nlattr *actions = da->actions;
758
759 if (actions)
760 do_execute_actions(dp, skb, key, actions,
761 nla_len(actions));
762 else
763 ovs_dp_process_packet(skb, key);
764 } while (!action_fifo_is_empty(fifo));
765
766 /* Reset FIFO for the next packet. */
767 action_fifo_init(fifo);
768}
769
ccb1352e 770/* Execute a list of actions against 'skb'. */
2ff3e4e4
PS
771int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
772 struct sw_flow_key *key)
ccb1352e 773{
971427f3
AZ
774 int level = this_cpu_read(exec_actions_level);
775 struct sw_flow_actions *acts;
776 int err;
777
778 acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
779
780 this_cpu_inc(exec_actions_level);
f0b128c1 781 OVS_CB(skb)->egress_tun_info = NULL;
971427f3
AZ
782 err = do_execute_actions(dp, skb, key,
783 acts->actions, acts->actions_len);
784
785 if (!level)
786 process_deferred_actions(dp);
787
788 this_cpu_dec(exec_actions_level);
789 return err;
790}
791
792int action_fifos_init(void)
793{
794 action_fifos = alloc_percpu(struct action_fifo);
795 if (!action_fifos)
796 return -ENOMEM;
ccb1352e 797
971427f3
AZ
798 return 0;
799}
800
801void action_fifos_exit(void)
802{
803 free_percpu(action_fifos);
ccb1352e 804}