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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / openvswitch / actions.c
blobe8902a7e60f24bccbe091a58f2aec5635c550f94
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2007-2017 Nicira, Inc.
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <linux/skbuff.h>
9 #include <linux/in.h>
10 #include <linux/ip.h>
11 #include <linux/openvswitch.h>
12 #include <linux/sctp.h>
13 #include <linux/tcp.h>
14 #include <linux/udp.h>
15 #include <linux/in6.h>
16 #include <linux/if_arp.h>
17 #include <linux/if_vlan.h>
18
19 #include <net/dst.h>
20 #include <net/ip.h>
21 #include <net/ipv6.h>
22 #include <net/ip6_fib.h>
23 #include <net/checksum.h>
24 #include <net/dsfield.h>
25 #include <net/mpls.h>
26 #include <net/sctp/checksum.h>
27
28 #include "datapath.h"
29 #include "flow.h"
30 #include "conntrack.h"
31 #include "vport.h"
32 #include "flow_netlink.h"
33
34 struct deferred_action {
35 struct sk_buff *skb;
36 const struct nlattr *actions;
37 int actions_len;
38
39 /* Store pkt_key clone when creating deferred action. */
40 struct sw_flow_key pkt_key;
41 };
42
43 #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
44 struct ovs_frag_data {
45 unsigned long dst;
46 struct vport *vport;
47 struct ovs_skb_cb cb;
48 __be16 inner_protocol;
49 u16 network_offset; /* valid only for MPLS */
50 u16 vlan_tci;
51 __be16 vlan_proto;
52 unsigned int l2_len;
53 u8 mac_proto;
54 u8 l2_data[MAX_L2_LEN];
55 };
56
57 static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
58
59 #define DEFERRED_ACTION_FIFO_SIZE 10
60 #define OVS_RECURSION_LIMIT 5
61 #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
62 struct action_fifo {
63 int head;
64 int tail;
65 /* Deferred action fifo queue storage. */
66 struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
67 };
68
69 struct action_flow_keys {
70 struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
71 };
72
73 static struct action_fifo __percpu *action_fifos;
74 static struct action_flow_keys __percpu *flow_keys;
75 static DEFINE_PER_CPU(int, exec_actions_level);
76
77 /* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
78 * space. Return NULL if out of key spaces.
79 */
80 static struct sw_flow_key *clone_key(const struct sw_flow_key *key_)
81 {
82 struct action_flow_keys *keys = this_cpu_ptr(flow_keys);
83 int level = this_cpu_read(exec_actions_level);
84 struct sw_flow_key *key = NULL;
85
86 if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
87 key = &keys->key[level - 1];
88 *key = *key_;
89 }
90
91 return key;
92 }
93
94 static void action_fifo_init(struct action_fifo *fifo)
95 {
96 fifo->head = 0;
97 fifo->tail = 0;
98 }
99
100 static bool action_fifo_is_empty(const struct action_fifo *fifo)
101 {
102 return (fifo->head == fifo->tail);
103 }
104
105 static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
106 {
107 if (action_fifo_is_empty(fifo))
108 return NULL;
109
110 return &fifo->fifo[fifo->tail++];
111 }
112
113 static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
114 {
115 if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
116 return NULL;
117
118 return &fifo->fifo[fifo->head++];
119 }
120
121 /* Return true if fifo is not full */
122 static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
123 const struct sw_flow_key *key,
124 const struct nlattr *actions,
125 const int actions_len)
126 {
127 struct action_fifo *fifo;
128 struct deferred_action *da;
129
130 fifo = this_cpu_ptr(action_fifos);
131 da = action_fifo_put(fifo);
132 if (da) {
133 da->skb = skb;
134 da->actions = actions;
135 da->actions_len = actions_len;
136 da->pkt_key = *key;
137 }
138
139 return da;
140 }
141
142 static void invalidate_flow_key(struct sw_flow_key *key)
143 {
144 key->mac_proto |= SW_FLOW_KEY_INVALID;
145 }
146
147 static bool is_flow_key_valid(const struct sw_flow_key *key)
148 {
149 return !(key->mac_proto & SW_FLOW_KEY_INVALID);
150 }
151
152 static int clone_execute(struct datapath *dp, struct sk_buff *skb,
153 struct sw_flow_key *key,
154 u32 recirc_id,
155 const struct nlattr *actions, int len,
156 bool last, bool clone_flow_key);
157
158 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
159 struct sw_flow_key *key,
160 const struct nlattr *attr, int len);
161
162 static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
163 __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len)
164 {
165 int err;
166
167 err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len);
168 if (err)
169 return err;
170
171 if (!mac_len)
172 key->mac_proto = MAC_PROTO_NONE;
173
174 invalidate_flow_key(key);
175 return 0;
176 }
177
178 static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
179 const __be16 ethertype)
180 {
181 int err;
182
183 err = skb_mpls_pop(skb, ethertype, skb->mac_len,
184 ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET);
185 if (err)
186 return err;
187
188 if (ethertype == htons(ETH_P_TEB))
189 key->mac_proto = MAC_PROTO_ETHERNET;
190
191 invalidate_flow_key(key);
192 return 0;
193 }
194
195 static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
196 const __be32 *mpls_lse, const __be32 *mask)
197 {
198 struct mpls_shim_hdr *stack;
199 __be32 lse;
200 int err;
201
202 if (!pskb_may_pull(skb, skb_network_offset(skb) + MPLS_HLEN))
203 return -ENOMEM;
204
205 stack = mpls_hdr(skb);
206 lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
207 err = skb_mpls_update_lse(skb, lse);
208 if (err)
209 return err;
210
211 flow_key->mpls.lse[0] = lse;
212 return 0;
213 }
214
215 static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
216 {
217 int err;
218
219 err = skb_vlan_pop(skb);
220 if (skb_vlan_tag_present(skb)) {
221 invalidate_flow_key(key);
222 } else {
223 key->eth.vlan.tci = 0;
224 key->eth.vlan.tpid = 0;
225 }
226 return err;
227 }
228
229 static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
230 const struct ovs_action_push_vlan *vlan)
231 {
232 if (skb_vlan_tag_present(skb)) {
233 invalidate_flow_key(key);
234 } else {
235 key->eth.vlan.tci = vlan->vlan_tci;
236 key->eth.vlan.tpid = vlan->vlan_tpid;
237 }
238 return skb_vlan_push(skb, vlan->vlan_tpid,
239 ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK);
240 }
241
242 /* 'src' is already properly masked. */
243 static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
244 {
245 u16 *dst = (u16 *)dst_;
246 const u16 *src = (const u16 *)src_;
247 const u16 *mask = (const u16 *)mask_;
248
249 OVS_SET_MASKED(dst[0], src[0], mask[0]);
250 OVS_SET_MASKED(dst[1], src[1], mask[1]);
251 OVS_SET_MASKED(dst[2], src[2], mask[2]);
252 }
253
254 static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
255 const struct ovs_key_ethernet *key,
256 const struct ovs_key_ethernet *mask)
257 {
258 int err;
259
260 err = skb_ensure_writable(skb, ETH_HLEN);
261 if (unlikely(err))
262 return err;
263
264 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
265
266 ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
267 mask->eth_src);
268 ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
269 mask->eth_dst);
270
271 skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
272
273 ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
274 ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
275 return 0;
276 }
277
278 /* pop_eth does not support VLAN packets as this action is never called
279 * for them.
280 */
281 static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
282 {
283 int err;
284
285 err = skb_eth_pop(skb);
286 if (err)
287 return err;
288
289 /* safe right before invalidate_flow_key */
290 key->mac_proto = MAC_PROTO_NONE;
291 invalidate_flow_key(key);
292 return 0;
293 }
294
295 static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
296 const struct ovs_action_push_eth *ethh)
297 {
298 int err;
299
300 err = skb_eth_push(skb, ethh->addresses.eth_dst,
301 ethh->addresses.eth_src);
302 if (err)
303 return err;
304
305 /* safe right before invalidate_flow_key */
306 key->mac_proto = MAC_PROTO_ETHERNET;
307 invalidate_flow_key(key);
308 return 0;
309 }
310
311 static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key,
312 const struct nshhdr *nh)
313 {
314 int err;
315
316 err = nsh_push(skb, nh);
317 if (err)
318 return err;
319
320 /* safe right before invalidate_flow_key */
321 key->mac_proto = MAC_PROTO_NONE;
322 invalidate_flow_key(key);
323 return 0;
324 }
325
326 static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key)
327 {
328 int err;
329
330 err = nsh_pop(skb);
331 if (err)
332 return err;
333
334 /* safe right before invalidate_flow_key */
335 if (skb->protocol == htons(ETH_P_TEB))
336 key->mac_proto = MAC_PROTO_ETHERNET;
337 else
338 key->mac_proto = MAC_PROTO_NONE;
339 invalidate_flow_key(key);
340 return 0;
341 }
342
343 static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh,
344 __be32 addr, __be32 new_addr)
345 {
346 int transport_len = skb->len - skb_transport_offset(skb);
347
348 if (nh->frag_off & htons(IP_OFFSET))
349 return;
350
351 if (nh->protocol == IPPROTO_TCP) {
352 if (likely(transport_len >= sizeof(struct tcphdr)))
353 inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
354 addr, new_addr, true);
355 } else if (nh->protocol == IPPROTO_UDP) {
356 if (likely(transport_len >= sizeof(struct udphdr))) {
357 struct udphdr *uh = udp_hdr(skb);
358
359 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
360 inet_proto_csum_replace4(&uh->check, skb,
361 addr, new_addr, true);
362 if (!uh->check)
363 uh->check = CSUM_MANGLED_0;
364 }
365 }
366 }
367 }
368
369 static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
370 __be32 *addr, __be32 new_addr)
371 {
372 update_ip_l4_checksum(skb, nh, *addr, new_addr);
373 csum_replace4(&nh->check, *addr, new_addr);
374 skb_clear_hash(skb);
375 *addr = new_addr;
376 }
377
378 static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
379 __be32 addr[4], const __be32 new_addr[4])
380 {
381 int transport_len = skb->len - skb_transport_offset(skb);
382
383 if (l4_proto == NEXTHDR_TCP) {
384 if (likely(transport_len >= sizeof(struct tcphdr)))
385 inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
386 addr, new_addr, true);
387 } else if (l4_proto == NEXTHDR_UDP) {
388 if (likely(transport_len >= sizeof(struct udphdr))) {
389 struct udphdr *uh = udp_hdr(skb);
390
391 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
392 inet_proto_csum_replace16(&uh->check, skb,
393 addr, new_addr, true);
394 if (!uh->check)
395 uh->check = CSUM_MANGLED_0;
396 }
397 }
398 } else if (l4_proto == NEXTHDR_ICMP) {
399 if (likely(transport_len >= sizeof(struct icmp6hdr)))
400 inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
401 skb, addr, new_addr, true);
402 }
403 }
404
405 static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
406 const __be32 mask[4], __be32 masked[4])
407 {
408 masked[0] = OVS_MASKED(old[0], addr[0], mask[0]);
409 masked[1] = OVS_MASKED(old[1], addr[1], mask[1]);
410 masked[2] = OVS_MASKED(old[2], addr[2], mask[2]);
411 masked[3] = OVS_MASKED(old[3], addr[3], mask[3]);
412 }
413
414 static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
415 __be32 addr[4], const __be32 new_addr[4],
416 bool recalculate_csum)
417 {
418 if (recalculate_csum)
419 update_ipv6_checksum(skb, l4_proto, addr, new_addr);
420
421 skb_clear_hash(skb);
422 memcpy(addr, new_addr, sizeof(__be32[4]));
423 }
424
425 static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask)
426 {
427 /* Bits 21-24 are always unmasked, so this retains their values. */
428 OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16));
429 OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8));
430 OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask);
431 }
432
433 static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
434 u8 mask)
435 {
436 new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask);
437
438 csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
439 nh->ttl = new_ttl;
440 }
441
442 static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
443 const struct ovs_key_ipv4 *key,
444 const struct ovs_key_ipv4 *mask)
445 {
446 struct iphdr *nh;
447 __be32 new_addr;
448 int err;
449
450 err = skb_ensure_writable(skb, skb_network_offset(skb) +
451 sizeof(struct iphdr));
452 if (unlikely(err))
453 return err;
454
455 nh = ip_hdr(skb);
456
457 /* Setting an IP addresses is typically only a side effect of
458 * matching on them in the current userspace implementation, so it
459 * makes sense to check if the value actually changed.
460 */
461 if (mask->ipv4_src) {
462 new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src);
463
464 if (unlikely(new_addr != nh->saddr)) {
465 set_ip_addr(skb, nh, &nh->saddr, new_addr);
466 flow_key->ipv4.addr.src = new_addr;
467 }
468 }
469 if (mask->ipv4_dst) {
470 new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst);
471
472 if (unlikely(new_addr != nh->daddr)) {
473 set_ip_addr(skb, nh, &nh->daddr, new_addr);
474 flow_key->ipv4.addr.dst = new_addr;
475 }
476 }
477 if (mask->ipv4_tos) {
478 ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos);
479 flow_key->ip.tos = nh->tos;
480 }
481 if (mask->ipv4_ttl) {
482 set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl);
483 flow_key->ip.ttl = nh->ttl;
484 }
485
486 return 0;
487 }
488
489 static bool is_ipv6_mask_nonzero(const __be32 addr[4])
490 {
491 return !!(addr[0] | addr[1] | addr[2] | addr[3]);
492 }
493
494 static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key,
495 const struct ovs_key_ipv6 *key,
496 const struct ovs_key_ipv6 *mask)
497 {
498 struct ipv6hdr *nh;
499 int err;
500
501 err = skb_ensure_writable(skb, skb_network_offset(skb) +
502 sizeof(struct ipv6hdr));
503 if (unlikely(err))
504 return err;
505
506 nh = ipv6_hdr(skb);
507
508 /* Setting an IP addresses is typically only a side effect of
509 * matching on them in the current userspace implementation, so it
510 * makes sense to check if the value actually changed.
511 */
512 if (is_ipv6_mask_nonzero(mask->ipv6_src)) {
513 __be32 *saddr = (__be32 *)&nh->saddr;
514 __be32 masked[4];
515
516 mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked);
517
518 if (unlikely(memcmp(saddr, masked, sizeof(masked)))) {
519 set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked,
520 true);
521 memcpy(&flow_key->ipv6.addr.src, masked,
522 sizeof(flow_key->ipv6.addr.src));
523 }
524 }
525 if (is_ipv6_mask_nonzero(mask->ipv6_dst)) {
526 unsigned int offset = 0;
527 int flags = IP6_FH_F_SKIP_RH;
528 bool recalc_csum = true;
529 __be32 *daddr = (__be32 *)&nh->daddr;
530 __be32 masked[4];
531
532 mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked);
533
534 if (unlikely(memcmp(daddr, masked, sizeof(masked)))) {
535 if (ipv6_ext_hdr(nh->nexthdr))
536 recalc_csum = (ipv6_find_hdr(skb, &offset,
537 NEXTHDR_ROUTING,
538 NULL, &flags)
539 != NEXTHDR_ROUTING);
540
541 set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked,
542 recalc_csum);
543 memcpy(&flow_key->ipv6.addr.dst, masked,
544 sizeof(flow_key->ipv6.addr.dst));
545 }
546 }
547 if (mask->ipv6_tclass) {
548 ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass);
549 flow_key->ip.tos = ipv6_get_dsfield(nh);
550 }
551 if (mask->ipv6_label) {
552 set_ipv6_fl(nh, ntohl(key->ipv6_label),
553 ntohl(mask->ipv6_label));
554 flow_key->ipv6.label =
555 *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
556 }
557 if (mask->ipv6_hlimit) {
558 OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit,
559 mask->ipv6_hlimit);
560 flow_key->ip.ttl = nh->hop_limit;
561 }
562 return 0;
563 }
564
565 static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key,
566 const struct nlattr *a)
567 {
568 struct nshhdr *nh;
569 size_t length;
570 int err;
571 u8 flags;
572 u8 ttl;
573 int i;
574
575 struct ovs_key_nsh key;
576 struct ovs_key_nsh mask;
577
578 err = nsh_key_from_nlattr(a, &key, &mask);
579 if (err)
580 return err;
581
582 /* Make sure the NSH base header is there */
583 if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN))
584 return -ENOMEM;
585
586 nh = nsh_hdr(skb);
587 length = nsh_hdr_len(nh);
588
589 /* Make sure the whole NSH header is there */
590 err = skb_ensure_writable(skb, skb_network_offset(skb) +
591 length);
592 if (unlikely(err))
593 return err;
594
595 nh = nsh_hdr(skb);
596 skb_postpull_rcsum(skb, nh, length);
597 flags = nsh_get_flags(nh);
598 flags = OVS_MASKED(flags, key.base.flags, mask.base.flags);
599 flow_key->nsh.base.flags = flags;
600 ttl = nsh_get_ttl(nh);
601 ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl);
602 flow_key->nsh.base.ttl = ttl;
603 nsh_set_flags_and_ttl(nh, flags, ttl);
604 nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr,
605 mask.base.path_hdr);
606 flow_key->nsh.base.path_hdr = nh->path_hdr;
607 switch (nh->mdtype) {
608 case NSH_M_TYPE1:
609 for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) {
610 nh->md1.context[i] =
611 OVS_MASKED(nh->md1.context[i], key.context[i],
612 mask.context[i]);
613 }
614 memcpy(flow_key->nsh.context, nh->md1.context,
615 sizeof(nh->md1.context));
616 break;
617 case NSH_M_TYPE2:
618 memset(flow_key->nsh.context, 0,
619 sizeof(flow_key->nsh.context));
620 break;
621 default:
622 return -EINVAL;
623 }
624 skb_postpush_rcsum(skb, nh, length);
625 return 0;
626 }
627
628 /* Must follow skb_ensure_writable() since that can move the skb data. */
629 static void set_tp_port(struct sk_buff *skb, __be16 *port,
630 __be16 new_port, __sum16 *check)
631 {
632 inet_proto_csum_replace2(check, skb, *port, new_port, false);
633 *port = new_port;
634 }
635
636 static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key,
637 const struct ovs_key_udp *key,
638 const struct ovs_key_udp *mask)
639 {
640 struct udphdr *uh;
641 __be16 src, dst;
642 int err;
643
644 err = skb_ensure_writable(skb, skb_transport_offset(skb) +
645 sizeof(struct udphdr));
646 if (unlikely(err))
647 return err;
648
649 uh = udp_hdr(skb);
650 /* Either of the masks is non-zero, so do not bother checking them. */
651 src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src);
652 dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst);
653
654 if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
655 if (likely(src != uh->source)) {
656 set_tp_port(skb, &uh->source, src, &uh->check);
657 flow_key->tp.src = src;
658 }
659 if (likely(dst != uh->dest)) {
660 set_tp_port(skb, &uh->dest, dst, &uh->check);
661 flow_key->tp.dst = dst;
662 }
663
664 if (unlikely(!uh->check))
665 uh->check = CSUM_MANGLED_0;
666 } else {
667 uh->source = src;
668 uh->dest = dst;
669 flow_key->tp.src = src;
670 flow_key->tp.dst = dst;
671 }
672
673 skb_clear_hash(skb);
674
675 return 0;
676 }
677
678 static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key,
679 const struct ovs_key_tcp *key,
680 const struct ovs_key_tcp *mask)
681 {
682 struct tcphdr *th;
683 __be16 src, dst;
684 int err;
685
686 err = skb_ensure_writable(skb, skb_transport_offset(skb) +
687 sizeof(struct tcphdr));
688 if (unlikely(err))
689 return err;
690
691 th = tcp_hdr(skb);
692 src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src);
693 if (likely(src != th->source)) {
694 set_tp_port(skb, &th->source, src, &th->check);
695 flow_key->tp.src = src;
696 }
697 dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst);
698 if (likely(dst != th->dest)) {
699 set_tp_port(skb, &th->dest, dst, &th->check);
700 flow_key->tp.dst = dst;
701 }
702 skb_clear_hash(skb);
703
704 return 0;
705 }
706
707 static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
708 const struct ovs_key_sctp *key,
709 const struct ovs_key_sctp *mask)
710 {
711 unsigned int sctphoff = skb_transport_offset(skb);
712 struct sctphdr *sh;
713 __le32 old_correct_csum, new_csum, old_csum;
714 int err;
715
716 err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
717 if (unlikely(err))
718 return err;
719
720 sh = sctp_hdr(skb);
721 old_csum = sh->checksum;
722 old_correct_csum = sctp_compute_cksum(skb, sctphoff);
723
724 sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src);
725 sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst);
726
727 new_csum = sctp_compute_cksum(skb, sctphoff);
728
729 /* Carry any checksum errors through. */
730 sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
731
732 skb_clear_hash(skb);
733 flow_key->tp.src = sh->source;
734 flow_key->tp.dst = sh->dest;
735
736 return 0;
737 }
738
739 static int ovs_vport_output(struct net *net, struct sock *sk,
740 struct sk_buff *skb)
741 {
742 struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
743 struct vport *vport = data->vport;
744
745 if (skb_cow_head(skb, data->l2_len) < 0) {
746 kfree_skb(skb);
747 return -ENOMEM;
748 }
749
750 __skb_dst_copy(skb, data->dst);
751 *OVS_CB(skb) = data->cb;
752 skb->inner_protocol = data->inner_protocol;
753 if (data->vlan_tci & VLAN_CFI_MASK)
754 __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK);
755 else
756 __vlan_hwaccel_clear_tag(skb);
757
758 /* Reconstruct the MAC header. */
759 skb_push(skb, data->l2_len);
760 memcpy(skb->data, &data->l2_data, data->l2_len);
761 skb_postpush_rcsum(skb, skb->data, data->l2_len);
762 skb_reset_mac_header(skb);
763
764 if (eth_p_mpls(skb->protocol)) {
765 skb->inner_network_header = skb->network_header;
766 skb_set_network_header(skb, data->network_offset);
767 skb_reset_mac_len(skb);
768 }
769
770 ovs_vport_send(vport, skb, data->mac_proto);
771 return 0;
772 }
773
774 static unsigned int
775 ovs_dst_get_mtu(const struct dst_entry *dst)
776 {
777 return dst->dev->mtu;
778 }
779
780 static struct dst_ops ovs_dst_ops = {
781 .family = AF_UNSPEC,
782 .mtu = ovs_dst_get_mtu,
783 };
784
785 /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
786 * ovs_vport_output(), which is called once per fragmented packet.
787 */
788 static void prepare_frag(struct vport *vport, struct sk_buff *skb,
789 u16 orig_network_offset, u8 mac_proto)
790 {
791 unsigned int hlen = skb_network_offset(skb);
792 struct ovs_frag_data *data;
793
794 data = this_cpu_ptr(&ovs_frag_data_storage);
795 data->dst = skb->_skb_refdst;
796 data->vport = vport;
797 data->cb = *OVS_CB(skb);
798 data->inner_protocol = skb->inner_protocol;
799 data->network_offset = orig_network_offset;
800 if (skb_vlan_tag_present(skb))
801 data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK;
802 else
803 data->vlan_tci = 0;
804 data->vlan_proto = skb->vlan_proto;
805 data->mac_proto = mac_proto;
806 data->l2_len = hlen;
807 memcpy(&data->l2_data, skb->data, hlen);
808
809 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
810 skb_pull(skb, hlen);
811 }
812
813 static void ovs_fragment(struct net *net, struct vport *vport,
814 struct sk_buff *skb, u16 mru,
815 struct sw_flow_key *key)
816 {
817 u16 orig_network_offset = 0;
818
819 if (eth_p_mpls(skb->protocol)) {
820 orig_network_offset = skb_network_offset(skb);
821 skb->network_header = skb->inner_network_header;
822 }
823
824 if (skb_network_offset(skb) > MAX_L2_LEN) {
825 OVS_NLERR(1, "L2 header too long to fragment");
826 goto err;
827 }
828
829 if (key->eth.type == htons(ETH_P_IP)) {
830 struct dst_entry ovs_dst;
831 unsigned long orig_dst;
832
833 prepare_frag(vport, skb, orig_network_offset,
834 ovs_key_mac_proto(key));
835 dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1,
836 DST_OBSOLETE_NONE, DST_NOCOUNT);
837 ovs_dst.dev = vport->dev;
838
839 orig_dst = skb->_skb_refdst;
840 skb_dst_set_noref(skb, &ovs_dst);
841 IPCB(skb)->frag_max_size = mru;
842
843 ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
844 refdst_drop(orig_dst);
845 } else if (key->eth.type == htons(ETH_P_IPV6)) {
846 unsigned long orig_dst;
847 struct rt6_info ovs_rt;
848
849 prepare_frag(vport, skb, orig_network_offset,
850 ovs_key_mac_proto(key));
851 memset(&ovs_rt, 0, sizeof(ovs_rt));
852 dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
853 DST_OBSOLETE_NONE, DST_NOCOUNT);
854 ovs_rt.dst.dev = vport->dev;
855
856 orig_dst = skb->_skb_refdst;
857 skb_dst_set_noref(skb, &ovs_rt.dst);
858 IP6CB(skb)->frag_max_size = mru;
859
860 ipv6_stub->ipv6_fragment(net, skb->sk, skb, ovs_vport_output);
861 refdst_drop(orig_dst);
862 } else {
863 WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
864 ovs_vport_name(vport), ntohs(key->eth.type), mru,
865 vport->dev->mtu);
866 goto err;
867 }
868
869 return;
870 err:
871 kfree_skb(skb);
872 }
873
874 static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
875 struct sw_flow_key *key)
876 {
877 struct vport *vport = ovs_vport_rcu(dp, out_port);
878
879 if (likely(vport)) {
880 u16 mru = OVS_CB(skb)->mru;
881 u32 cutlen = OVS_CB(skb)->cutlen;
882
883 if (unlikely(cutlen > 0)) {
884 if (skb->len - cutlen > ovs_mac_header_len(key))
885 pskb_trim(skb, skb->len - cutlen);
886 else
887 pskb_trim(skb, ovs_mac_header_len(key));
888 }
889
890 if (likely(!mru ||
891 (skb->len <= mru + vport->dev->hard_header_len))) {
892 ovs_vport_send(vport, skb, ovs_key_mac_proto(key));
893 } else if (mru <= vport->dev->mtu) {
894 struct net *net = read_pnet(&dp->net);
895
896 ovs_fragment(net, vport, skb, mru, key);
897 } else {
898 kfree_skb(skb);
899 }
900 } else {
901 kfree_skb(skb);
902 }
903 }
904
905 static int output_userspace(struct datapath *dp, struct sk_buff *skb,
906 struct sw_flow_key *key, const struct nlattr *attr,
907 const struct nlattr *actions, int actions_len,
908 uint32_t cutlen)
909 {
910 struct dp_upcall_info upcall;
911 const struct nlattr *a;
912 int rem;
913
914 memset(&upcall, 0, sizeof(upcall));
915 upcall.cmd = OVS_PACKET_CMD_ACTION;
916 upcall.mru = OVS_CB(skb)->mru;
917
918 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
919 a = nla_next(a, &rem)) {
920 switch (nla_type(a)) {
921 case OVS_USERSPACE_ATTR_USERDATA:
922 upcall.userdata = a;
923 break;
924
925 case OVS_USERSPACE_ATTR_PID:
926 upcall.portid = nla_get_u32(a);
927 break;
928
929 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
930 /* Get out tunnel info. */
931 struct vport *vport;
932
933 vport = ovs_vport_rcu(dp, nla_get_u32(a));
934 if (vport) {
935 int err;
936
937 err = dev_fill_metadata_dst(vport->dev, skb);
938 if (!err)
939 upcall.egress_tun_info = skb_tunnel_info(skb);
940 }
941
942 break;
943 }
944
945 case OVS_USERSPACE_ATTR_ACTIONS: {
946 /* Include actions. */
947 upcall.actions = actions;
948 upcall.actions_len = actions_len;
949 break;
950 }
951
952 } /* End of switch. */
953 }
954
955 return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
956 }
957
958 static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb,
959 struct sw_flow_key *key,
960 const struct nlattr *attr, bool last)
961 {
962 /* The first attribute is always 'OVS_DEC_TTL_ATTR_ACTION'. */
963 struct nlattr *actions = nla_data(attr);
964
965 if (nla_len(actions))
966 return clone_execute(dp, skb, key, 0, nla_data(actions),
967 nla_len(actions), last, false);
968
969 consume_skb(skb);
970 return 0;
971 }
972
973 /* When 'last' is true, sample() should always consume the 'skb'.
974 * Otherwise, sample() should keep 'skb' intact regardless what
975 * actions are executed within sample().
976 */
977 static int sample(struct datapath *dp, struct sk_buff *skb,
978 struct sw_flow_key *key, const struct nlattr *attr,
979 bool last)
980 {
981 struct nlattr *actions;
982 struct nlattr *sample_arg;
983 int rem = nla_len(attr);
984 const struct sample_arg *arg;
985 bool clone_flow_key;
986
987 /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */
988 sample_arg = nla_data(attr);
989 arg = nla_data(sample_arg);
990 actions = nla_next(sample_arg, &rem);
991
992 if ((arg->probability != U32_MAX) &&
993 (!arg->probability || prandom_u32() > arg->probability)) {
994 if (last)
995 consume_skb(skb);
996 return 0;
997 }
998
999 clone_flow_key = !arg->exec;
1000 return clone_execute(dp, skb, key, 0, actions, rem, last,
1001 clone_flow_key);
1002 }
1003
1004 /* When 'last' is true, clone() should always consume the 'skb'.
1005 * Otherwise, clone() should keep 'skb' intact regardless what
1006 * actions are executed within clone().
1007 */
1008 static int clone(struct datapath *dp, struct sk_buff *skb,
1009 struct sw_flow_key *key, const struct nlattr *attr,
1010 bool last)
1011 {
1012 struct nlattr *actions;
1013 struct nlattr *clone_arg;
1014 int rem = nla_len(attr);
1015 bool dont_clone_flow_key;
1016
1017 /* The first action is always 'OVS_CLONE_ATTR_ARG'. */
1018 clone_arg = nla_data(attr);
1019 dont_clone_flow_key = nla_get_u32(clone_arg);
1020 actions = nla_next(clone_arg, &rem);
1021
1022 return clone_execute(dp, skb, key, 0, actions, rem, last,
1023 !dont_clone_flow_key);
1024 }
1025
1026 static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
1027 const struct nlattr *attr)
1028 {
1029 struct ovs_action_hash *hash_act = nla_data(attr);
1030 u32 hash = 0;
1031
1032 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
1033 hash = skb_get_hash(skb);
1034 hash = jhash_1word(hash, hash_act->hash_basis);
1035 if (!hash)
1036 hash = 0x1;
1037
1038 key->ovs_flow_hash = hash;
1039 }
1040
1041 static int execute_set_action(struct sk_buff *skb,
1042 struct sw_flow_key *flow_key,
1043 const struct nlattr *a)
1044 {
1045 /* Only tunnel set execution is supported without a mask. */
1046 if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
1047 struct ovs_tunnel_info *tun = nla_data(a);
1048
1049 skb_dst_drop(skb);
1050 dst_hold((struct dst_entry *)tun->tun_dst);
1051 skb_dst_set(skb, (struct dst_entry *)tun->tun_dst);
1052 return 0;
1053 }
1054
1055 return -EINVAL;
1056 }
1057
1058 /* Mask is at the midpoint of the data. */
1059 #define get_mask(a, type) ((const type)nla_data(a) + 1)
1060
1061 static int execute_masked_set_action(struct sk_buff *skb,
1062 struct sw_flow_key *flow_key,
1063 const struct nlattr *a)
1064 {
1065 int err = 0;
1066
1067 switch (nla_type(a)) {
1068 case OVS_KEY_ATTR_PRIORITY:
1069 OVS_SET_MASKED(skb->priority, nla_get_u32(a),
1070 *get_mask(a, u32 *));
1071 flow_key->phy.priority = skb->priority;
1072 break;
1073
1074 case OVS_KEY_ATTR_SKB_MARK:
1075 OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
1076 flow_key->phy.skb_mark = skb->mark;
1077 break;
1078
1079 case OVS_KEY_ATTR_TUNNEL_INFO:
1080 /* Masked data not supported for tunnel. */
1081 err = -EINVAL;
1082 break;
1083
1084 case OVS_KEY_ATTR_ETHERNET:
1085 err = set_eth_addr(skb, flow_key, nla_data(a),
1086 get_mask(a, struct ovs_key_ethernet *));
1087 break;
1088
1089 case OVS_KEY_ATTR_NSH:
1090 err = set_nsh(skb, flow_key, a);
1091 break;
1092
1093 case OVS_KEY_ATTR_IPV4:
1094 err = set_ipv4(skb, flow_key, nla_data(a),
1095 get_mask(a, struct ovs_key_ipv4 *));
1096 break;
1097
1098 case OVS_KEY_ATTR_IPV6:
1099 err = set_ipv6(skb, flow_key, nla_data(a),
1100 get_mask(a, struct ovs_key_ipv6 *));
1101 break;
1102
1103 case OVS_KEY_ATTR_TCP:
1104 err = set_tcp(skb, flow_key, nla_data(a),
1105 get_mask(a, struct ovs_key_tcp *));
1106 break;
1107
1108 case OVS_KEY_ATTR_UDP:
1109 err = set_udp(skb, flow_key, nla_data(a),
1110 get_mask(a, struct ovs_key_udp *));
1111 break;
1112
1113 case OVS_KEY_ATTR_SCTP:
1114 err = set_sctp(skb, flow_key, nla_data(a),
1115 get_mask(a, struct ovs_key_sctp *));
1116 break;
1117
1118 case OVS_KEY_ATTR_MPLS:
1119 err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
1120 __be32 *));
1121 break;
1122
1123 case OVS_KEY_ATTR_CT_STATE:
1124 case OVS_KEY_ATTR_CT_ZONE:
1125 case OVS_KEY_ATTR_CT_MARK:
1126 case OVS_KEY_ATTR_CT_LABELS:
1127 case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
1128 case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
1129 err = -EINVAL;
1130 break;
1131 }
1132
1133 return err;
1134 }
1135
1136 static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
1137 struct sw_flow_key *key,
1138 const struct nlattr *a, bool last)
1139 {
1140 u32 recirc_id;
1141
1142 if (!is_flow_key_valid(key)) {
1143 int err;
1144
1145 err = ovs_flow_key_update(skb, key);
1146 if (err)
1147 return err;
1148 }
1149 BUG_ON(!is_flow_key_valid(key));
1150
1151 recirc_id = nla_get_u32(a);
1152 return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true);
1153 }
1154
1155 static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb,
1156 struct sw_flow_key *key,
1157 const struct nlattr *attr, bool last)
1158 {
1159 struct ovs_skb_cb *ovs_cb = OVS_CB(skb);
1160 const struct nlattr *actions, *cpl_arg;
1161 int len, max_len, rem = nla_len(attr);
1162 const struct check_pkt_len_arg *arg;
1163 bool clone_flow_key;
1164
1165 /* The first netlink attribute in 'attr' is always
1166 * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
1167 */
1168 cpl_arg = nla_data(attr);
1169 arg = nla_data(cpl_arg);
1170
1171 len = ovs_cb->mru ? ovs_cb->mru + skb->mac_len : skb->len;
1172 max_len = arg->pkt_len;
1173
1174 if ((skb_is_gso(skb) && skb_gso_validate_mac_len(skb, max_len)) ||
1175 len <= max_len) {
1176 /* Second netlink attribute in 'attr' is always
1177 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
1178 */
1179 actions = nla_next(cpl_arg, &rem);
1180 clone_flow_key = !arg->exec_for_lesser_equal;
1181 } else {
1182 /* Third netlink attribute in 'attr' is always
1183 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'.
1184 */
1185 actions = nla_next(cpl_arg, &rem);
1186 actions = nla_next(actions, &rem);
1187 clone_flow_key = !arg->exec_for_greater;
1188 }
1189
1190 return clone_execute(dp, skb, key, 0, nla_data(actions),
1191 nla_len(actions), last, clone_flow_key);
1192 }
1193
1194 static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key)
1195 {
1196 int err;
1197
1198 if (skb->protocol == htons(ETH_P_IPV6)) {
1199 struct ipv6hdr *nh;
1200
1201 err = skb_ensure_writable(skb, skb_network_offset(skb) +
1202 sizeof(*nh));
1203 if (unlikely(err))
1204 return err;
1205
1206 nh = ipv6_hdr(skb);
1207
1208 if (nh->hop_limit <= 1)
1209 return -EHOSTUNREACH;
1210
1211 key->ip.ttl = --nh->hop_limit;
1212 } else if (skb->protocol == htons(ETH_P_IP)) {
1213 struct iphdr *nh;
1214 u8 old_ttl;
1215
1216 err = skb_ensure_writable(skb, skb_network_offset(skb) +
1217 sizeof(*nh));
1218 if (unlikely(err))
1219 return err;
1220
1221 nh = ip_hdr(skb);
1222 if (nh->ttl <= 1)
1223 return -EHOSTUNREACH;
1224
1225 old_ttl = nh->ttl--;
1226 csum_replace2(&nh->check, htons(old_ttl << 8),
1227 htons(nh->ttl << 8));
1228 key->ip.ttl = nh->ttl;
1229 }
1230 return 0;
1231 }
1232
1233 /* Execute a list of actions against 'skb'. */
1234 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
1235 struct sw_flow_key *key,
1236 const struct nlattr *attr, int len)
1237 {
1238 const struct nlattr *a;
1239 int rem;
1240
1241 for (a = attr, rem = len; rem > 0;
1242 a = nla_next(a, &rem)) {
1243 int err = 0;
1244
1245 switch (nla_type(a)) {
1246 case OVS_ACTION_ATTR_OUTPUT: {
1247 int port = nla_get_u32(a);
1248 struct sk_buff *clone;
1249
1250 /* Every output action needs a separate clone
1251 * of 'skb', In case the output action is the
1252 * last action, cloning can be avoided.
1253 */
1254 if (nla_is_last(a, rem)) {
1255 do_output(dp, skb, port, key);
1256 /* 'skb' has been used for output.
1257 */
1258 return 0;
1259 }
1260
1261 clone = skb_clone(skb, GFP_ATOMIC);
1262 if (clone)
1263 do_output(dp, clone, port, key);
1264 OVS_CB(skb)->cutlen = 0;
1265 break;
1266 }
1267
1268 case OVS_ACTION_ATTR_TRUNC: {
1269 struct ovs_action_trunc *trunc = nla_data(a);
1270
1271 if (skb->len > trunc->max_len)
1272 OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
1273 break;
1274 }
1275
1276 case OVS_ACTION_ATTR_USERSPACE:
1277 output_userspace(dp, skb, key, a, attr,
1278 len, OVS_CB(skb)->cutlen);
1279 OVS_CB(skb)->cutlen = 0;
1280 break;
1281
1282 case OVS_ACTION_ATTR_HASH:
1283 execute_hash(skb, key, a);
1284 break;
1285
1286 case OVS_ACTION_ATTR_PUSH_MPLS: {
1287 struct ovs_action_push_mpls *mpls = nla_data(a);
1288
1289 err = push_mpls(skb, key, mpls->mpls_lse,
1290 mpls->mpls_ethertype, skb->mac_len);
1291 break;
1292 }
1293 case OVS_ACTION_ATTR_ADD_MPLS: {
1294 struct ovs_action_add_mpls *mpls = nla_data(a);
1295 __u16 mac_len = 0;
1296
1297 if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK)
1298 mac_len = skb->mac_len;
1299
1300 err = push_mpls(skb, key, mpls->mpls_lse,
1301 mpls->mpls_ethertype, mac_len);
1302 break;
1303 }
1304 case OVS_ACTION_ATTR_POP_MPLS:
1305 err = pop_mpls(skb, key, nla_get_be16(a));
1306 break;
1307
1308 case OVS_ACTION_ATTR_PUSH_VLAN:
1309 err = push_vlan(skb, key, nla_data(a));
1310 break;
1311
1312 case OVS_ACTION_ATTR_POP_VLAN:
1313 err = pop_vlan(skb, key);
1314 break;
1315
1316 case OVS_ACTION_ATTR_RECIRC: {
1317 bool last = nla_is_last(a, rem);
1318
1319 err = execute_recirc(dp, skb, key, a, last);
1320 if (last) {
1321 /* If this is the last action, the skb has
1322 * been consumed or freed.
1323 * Return immediately.
1324 */
1325 return err;
1326 }
1327 break;
1328 }
1329
1330 case OVS_ACTION_ATTR_SET:
1331 err = execute_set_action(skb, key, nla_data(a));
1332 break;
1333
1334 case OVS_ACTION_ATTR_SET_MASKED:
1335 case OVS_ACTION_ATTR_SET_TO_MASKED:
1336 err = execute_masked_set_action(skb, key, nla_data(a));
1337 break;
1338
1339 case OVS_ACTION_ATTR_SAMPLE: {
1340 bool last = nla_is_last(a, rem);
1341
1342 err = sample(dp, skb, key, a, last);
1343 if (last)
1344 return err;
1345
1346 break;
1347 }
1348
1349 case OVS_ACTION_ATTR_CT:
1350 if (!is_flow_key_valid(key)) {
1351 err = ovs_flow_key_update(skb, key);
1352 if (err)
1353 return err;
1354 }
1355
1356 err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
1357 nla_data(a));
1358
1359 /* Hide stolen IP fragments from user space. */
1360 if (err)
1361 return err == -EINPROGRESS ? 0 : err;
1362 break;
1363
1364 case OVS_ACTION_ATTR_CT_CLEAR:
1365 err = ovs_ct_clear(skb, key);
1366 break;
1367
1368 case OVS_ACTION_ATTR_PUSH_ETH:
1369 err = push_eth(skb, key, nla_data(a));
1370 break;
1371
1372 case OVS_ACTION_ATTR_POP_ETH:
1373 err = pop_eth(skb, key);
1374 break;
1375
1376 case OVS_ACTION_ATTR_PUSH_NSH: {
1377 u8 buffer[NSH_HDR_MAX_LEN];
1378 struct nshhdr *nh = (struct nshhdr *)buffer;
1379
1380 err = nsh_hdr_from_nlattr(nla_data(a), nh,
1381 NSH_HDR_MAX_LEN);
1382 if (unlikely(err))
1383 break;
1384 err = push_nsh(skb, key, nh);
1385 break;
1386 }
1387
1388 case OVS_ACTION_ATTR_POP_NSH:
1389 err = pop_nsh(skb, key);
1390 break;
1391
1392 case OVS_ACTION_ATTR_METER:
1393 if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) {
1394 consume_skb(skb);
1395 return 0;
1396 }
1397 break;
1398
1399 case OVS_ACTION_ATTR_CLONE: {
1400 bool last = nla_is_last(a, rem);
1401
1402 err = clone(dp, skb, key, a, last);
1403 if (last)
1404 return err;
1405
1406 break;
1407 }
1408
1409 case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
1410 bool last = nla_is_last(a, rem);
1411
1412 err = execute_check_pkt_len(dp, skb, key, a, last);
1413 if (last)
1414 return err;
1415
1416 break;
1417 }
1418
1419 case OVS_ACTION_ATTR_DEC_TTL:
1420 err = execute_dec_ttl(skb, key);
1421 if (err == -EHOSTUNREACH) {
1422 err = dec_ttl_exception_handler(dp, skb, key,
1423 a, true);
1424 return err;
1425 }
1426 break;
1427 }
1428
1429 if (unlikely(err)) {
1430 kfree_skb(skb);
1431 return err;
1432 }
1433 }
1434
1435 consume_skb(skb);
1436 return 0;
1437 }
1438
1439 /* Execute the actions on the clone of the packet. The effect of the
1440 * execution does not affect the original 'skb' nor the original 'key'.
1441 *
1442 * The execution may be deferred in case the actions can not be executed
1443 * immediately.
1444 */
1445 static int clone_execute(struct datapath *dp, struct sk_buff *skb,
1446 struct sw_flow_key *key, u32 recirc_id,
1447 const struct nlattr *actions, int len,
1448 bool last, bool clone_flow_key)
1449 {
1450 struct deferred_action *da;
1451 struct sw_flow_key *clone;
1452
1453 skb = last ? skb : skb_clone(skb, GFP_ATOMIC);
1454 if (!skb) {
1455 /* Out of memory, skip this action.
1456 */
1457 return 0;
1458 }
1459
1460 /* When clone_flow_key is false, the 'key' will not be change
1461 * by the actions, then the 'key' can be used directly.
1462 * Otherwise, try to clone key from the next recursion level of
1463 * 'flow_keys'. If clone is successful, execute the actions
1464 * without deferring.
1465 */
1466 clone = clone_flow_key ? clone_key(key) : key;
1467 if (clone) {
1468 int err = 0;
1469
1470 if (actions) { /* Sample action */
1471 if (clone_flow_key)
1472 __this_cpu_inc(exec_actions_level);
1473
1474 err = do_execute_actions(dp, skb, clone,
1475 actions, len);
1476
1477 if (clone_flow_key)
1478 __this_cpu_dec(exec_actions_level);
1479 } else { /* Recirc action */
1480 clone->recirc_id = recirc_id;
1481 ovs_dp_process_packet(skb, clone);
1482 }
1483 return err;
1484 }
1485
1486 /* Out of 'flow_keys' space. Defer actions */
1487 da = add_deferred_actions(skb, key, actions, len);
1488 if (da) {
1489 if (!actions) { /* Recirc action */
1490 key = &da->pkt_key;
1491 key->recirc_id = recirc_id;
1492 }
1493 } else {
1494 /* Out of per CPU action FIFO space. Drop the 'skb' and
1495 * log an error.
1496 */
1497 kfree_skb(skb);
1498
1499 if (net_ratelimit()) {
1500 if (actions) { /* Sample action */
1501 pr_warn("%s: deferred action limit reached, drop sample action\n",
1502 ovs_dp_name(dp));
1503 } else { /* Recirc action */
1504 pr_warn("%s: deferred action limit reached, drop recirc action\n",
1505 ovs_dp_name(dp));
1506 }
1507 }
1508 }
1509 return 0;
1510 }
1511
1512 static void process_deferred_actions(struct datapath *dp)
1513 {
1514 struct action_fifo *fifo = this_cpu_ptr(action_fifos);
1515
1516 /* Do not touch the FIFO in case there is no deferred actions. */
1517 if (action_fifo_is_empty(fifo))
1518 return;
1519
1520 /* Finishing executing all deferred actions. */
1521 do {
1522 struct deferred_action *da = action_fifo_get(fifo);
1523 struct sk_buff *skb = da->skb;
1524 struct sw_flow_key *key = &da->pkt_key;
1525 const struct nlattr *actions = da->actions;
1526 int actions_len = da->actions_len;
1527
1528 if (actions)
1529 do_execute_actions(dp, skb, key, actions, actions_len);
1530 else
1531 ovs_dp_process_packet(skb, key);
1532 } while (!action_fifo_is_empty(fifo));
1533
1534 /* Reset FIFO for the next packet. */
1535 action_fifo_init(fifo);
1536 }
1537
1538 /* Execute a list of actions against 'skb'. */
1539 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
1540 const struct sw_flow_actions *acts,
1541 struct sw_flow_key *key)
1542 {
1543 int err, level;
1544
1545 level = __this_cpu_inc_return(exec_actions_level);
1546 if (unlikely(level > OVS_RECURSION_LIMIT)) {
1547 net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
1548 ovs_dp_name(dp));
1549 kfree_skb(skb);
1550 err = -ENETDOWN;
1551 goto out;
1552 }
1553
1554 OVS_CB(skb)->acts_origlen = acts->orig_len;
1555 err = do_execute_actions(dp, skb, key,
1556 acts->actions, acts->actions_len);
1557
1558 if (level == 1)
1559 process_deferred_actions(dp);
1560
1561 out:
1562 __this_cpu_dec(exec_actions_level);
1563 return err;
1564 }
1565
1566 int action_fifos_init(void)
1567 {
1568 action_fifos = alloc_percpu(struct action_fifo);
1569 if (!action_fifos)
1570 return -ENOMEM;
1571
1572 flow_keys = alloc_percpu(struct action_flow_keys);
1573 if (!flow_keys) {
1574 free_percpu(action_fifos);
1575 return -ENOMEM;
1576 }
1577
1578 return 0;
1579 }
1580
1581 void action_fifos_exit(void)
1582 {
1583 free_percpu(action_fifos);
1584 free_percpu(flow_keys);
1585 }
Linux with added FPC-III support