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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/netfilter_ipv6.h>
13#include <linux/sctp.h>
14#include <linux/tcp.h>
15#include <linux/udp.h>
16#include <linux/in6.h>
17#include <linux/if_arp.h>
18#include <linux/if_vlan.h>
19
20#include <net/dst.h>
21#include <net/ip.h>
22#include <net/ipv6.h>
23#include <net/ip6_fib.h>
24#include <net/checksum.h>
25#include <net/dsfield.h>
26#include <net/mpls.h>
27#include <net/sctp/checksum.h>
28
29#include "datapath.h"
30#include "flow.h"
31#include "conntrack.h"
32#include "vport.h"
33#include "flow_netlink.h"
34
35struct deferred_action {
36 struct sk_buff *skb;
37 const struct nlattr *actions;
38 int actions_len;
39
40 /* Store pkt_key clone when creating deferred action. */
41 struct sw_flow_key pkt_key;
42};
43
44#define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
45struct ovs_frag_data {
46 unsigned long dst;
47 struct vport *vport;
48 struct ovs_skb_cb cb;
49 __be16 inner_protocol;
50 u16 network_offset; /* valid only for MPLS */
51 u16 vlan_tci;
52 __be16 vlan_proto;
53 unsigned int l2_len;
54 u8 mac_proto;
55 u8 l2_data[MAX_L2_LEN];
56};
57
58static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
59
60#define DEFERRED_ACTION_FIFO_SIZE 10
61#define OVS_RECURSION_LIMIT 5
62#define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
63struct action_fifo {
64 int head;
65 int tail;
66 /* Deferred action fifo queue storage. */
67 struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
68};
69
70struct action_flow_keys {
71 struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
72};
73
74static struct action_fifo __percpu *action_fifos;
75static struct action_flow_keys __percpu *flow_keys;
76static DEFINE_PER_CPU(int, exec_actions_level);
77
78/* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
79 * space. Return NULL if out of key spaces.
80 */
81static struct sw_flow_key *clone_key(const struct sw_flow_key *key_)
82{
83 struct action_flow_keys *keys = this_cpu_ptr(flow_keys);
84 int level = this_cpu_read(exec_actions_level);
85 struct sw_flow_key *key = NULL;
86
87 if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
88 key = &keys->key[level - 1];
89 *key = *key_;
90 }
91
92 return key;
93}
94
95static void action_fifo_init(struct action_fifo *fifo)
96{
97 fifo->head = 0;
98 fifo->tail = 0;
99}
100
101static bool action_fifo_is_empty(const struct action_fifo *fifo)
102{
103 return (fifo->head == fifo->tail);
104}
105
106static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
107{
108 if (action_fifo_is_empty(fifo))
109 return NULL;
110
111 return &fifo->fifo[fifo->tail++];
112}
113
114static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
115{
116 if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
117 return NULL;
118
119 return &fifo->fifo[fifo->head++];
120}
121
122/* Return true if fifo is not full */
123static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
124 const struct sw_flow_key *key,
125 const struct nlattr *actions,
126 const int actions_len)
127{
128 struct action_fifo *fifo;
129 struct deferred_action *da;
130
131 fifo = this_cpu_ptr(action_fifos);
132 da = action_fifo_put(fifo);
133 if (da) {
134 da->skb = skb;
135 da->actions = actions;
136 da->actions_len = actions_len;
137 da->pkt_key = *key;
138 }
139
140 return da;
141}
142
143static void invalidate_flow_key(struct sw_flow_key *key)
144{
145 key->mac_proto |= SW_FLOW_KEY_INVALID;
146}
147
148static bool is_flow_key_valid(const struct sw_flow_key *key)
149{
150 return !(key->mac_proto & SW_FLOW_KEY_INVALID);
151}
152
153static int clone_execute(struct datapath *dp, struct sk_buff *skb,
154 struct sw_flow_key *key,
155 u32 recirc_id,
156 const struct nlattr *actions, int len,
157 bool last, bool clone_flow_key);
158
159static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
160 struct sw_flow_key *key,
161 const struct nlattr *attr, int len);
162
163static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
164 const struct ovs_action_push_mpls *mpls)
165{
166 int err;
167
168 err = skb_mpls_push(skb, mpls->mpls_lse, mpls->mpls_ethertype,
169 skb->mac_len);
170 if (err)
171 return err;
172
173 invalidate_flow_key(key);
174 return 0;
175}
176
177static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
178 const __be16 ethertype)
179{
180 int err;
181
182 err = skb_mpls_pop(skb, ethertype, skb->mac_len);
183 if (err)
184 return err;
185
186 invalidate_flow_key(key);
187 return 0;
188}
189
190static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
191 const __be32 *mpls_lse, const __be32 *mask)
192{
193 struct mpls_shim_hdr *stack;
194 __be32 lse;
195 int err;
196
197 stack = mpls_hdr(skb);
198 lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
199 err = skb_mpls_update_lse(skb, lse);
200 if (err)
201 return err;
202
203 flow_key->mpls.top_lse = lse;
204 return 0;
205}
206
207static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
208{
209 int err;
210
211 err = skb_vlan_pop(skb);
212 if (skb_vlan_tag_present(skb)) {
213 invalidate_flow_key(key);
214 } else {
215 key->eth.vlan.tci = 0;
216 key->eth.vlan.tpid = 0;
217 }
218 return err;
219}
220
221static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
222 const struct ovs_action_push_vlan *vlan)
223{
224 if (skb_vlan_tag_present(skb)) {
225 invalidate_flow_key(key);
226 } else {
227 key->eth.vlan.tci = vlan->vlan_tci;
228 key->eth.vlan.tpid = vlan->vlan_tpid;
229 }
230 return skb_vlan_push(skb, vlan->vlan_tpid,
231 ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK);
232}
233
234/* 'src' is already properly masked. */
235static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
236{
237 u16 *dst = (u16 *)dst_;
238 const u16 *src = (const u16 *)src_;
239 const u16 *mask = (const u16 *)mask_;
240
241 OVS_SET_MASKED(dst[0], src[0], mask[0]);
242 OVS_SET_MASKED(dst[1], src[1], mask[1]);
243 OVS_SET_MASKED(dst[2], src[2], mask[2]);
244}
245
246static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
247 const struct ovs_key_ethernet *key,
248 const struct ovs_key_ethernet *mask)
249{
250 int err;
251
252 err = skb_ensure_writable(skb, ETH_HLEN);
253 if (unlikely(err))
254 return err;
255
256 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
257
258 ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
259 mask->eth_src);
260 ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
261 mask->eth_dst);
262
263 skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
264
265 ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
266 ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
267 return 0;
268}
269
270/* pop_eth does not support VLAN packets as this action is never called
271 * for them.
272 */
273static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
274{
275 skb_pull_rcsum(skb, ETH_HLEN);
276 skb_reset_mac_header(skb);
277 skb_reset_mac_len(skb);
278
279 /* safe right before invalidate_flow_key */
280 key->mac_proto = MAC_PROTO_NONE;
281 invalidate_flow_key(key);
282 return 0;
283}
284
285static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
286 const struct ovs_action_push_eth *ethh)
287{
288 struct ethhdr *hdr;
289
290 /* Add the new Ethernet header */
291 if (skb_cow_head(skb, ETH_HLEN) < 0)
292 return -ENOMEM;
293
294 skb_push(skb, ETH_HLEN);
295 skb_reset_mac_header(skb);
296 skb_reset_mac_len(skb);
297
298 hdr = eth_hdr(skb);
299 ether_addr_copy(hdr->h_source, ethh->addresses.eth_src);
300 ether_addr_copy(hdr->h_dest, ethh->addresses.eth_dst);
301 hdr->h_proto = skb->protocol;
302
303 skb_postpush_rcsum(skb, hdr, ETH_HLEN);
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
311static 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
326static 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
343static 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
369static 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
378static 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
405static 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
414static 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
425static 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
433static 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
442static 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
489static bool is_ipv6_mask_nonzero(const __be32 addr[4])
490{
491 return !!(addr[0] | addr[1] | addr[2] | addr[3]);
492}
493
494static 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
565static 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. */
629static 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
636static 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
678static 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
707static 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
739static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *skb)
740{
741 struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
742 struct vport *vport = data->vport;
743
744 if (skb_cow_head(skb, data->l2_len) < 0) {
745 kfree_skb(skb);
746 return -ENOMEM;
747 }
748
749 __skb_dst_copy(skb, data->dst);
750 *OVS_CB(skb) = data->cb;
751 skb->inner_protocol = data->inner_protocol;
752 if (data->vlan_tci & VLAN_CFI_MASK)
753 __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK);
754 else
755 __vlan_hwaccel_clear_tag(skb);
756
757 /* Reconstruct the MAC header. */
758 skb_push(skb, data->l2_len);
759 memcpy(skb->data, &data->l2_data, data->l2_len);
760 skb_postpush_rcsum(skb, skb->data, data->l2_len);
761 skb_reset_mac_header(skb);
762
763 if (eth_p_mpls(skb->protocol)) {
764 skb->inner_network_header = skb->network_header;
765 skb_set_network_header(skb, data->network_offset);
766 skb_reset_mac_len(skb);
767 }
768
769 ovs_vport_send(vport, skb, data->mac_proto);
770 return 0;
771}
772
773static unsigned int
774ovs_dst_get_mtu(const struct dst_entry *dst)
775{
776 return dst->dev->mtu;
777}
778
779static struct dst_ops ovs_dst_ops = {
780 .family = AF_UNSPEC,
781 .mtu = ovs_dst_get_mtu,
782};
783
784/* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
785 * ovs_vport_output(), which is called once per fragmented packet.
786 */
787static void prepare_frag(struct vport *vport, struct sk_buff *skb,
788 u16 orig_network_offset, u8 mac_proto)
789{
790 unsigned int hlen = skb_network_offset(skb);
791 struct ovs_frag_data *data;
792
793 data = this_cpu_ptr(&ovs_frag_data_storage);
794 data->dst = skb->_skb_refdst;
795 data->vport = vport;
796 data->cb = *OVS_CB(skb);
797 data->inner_protocol = skb->inner_protocol;
798 data->network_offset = orig_network_offset;
799 if (skb_vlan_tag_present(skb))
800 data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK;
801 else
802 data->vlan_tci = 0;
803 data->vlan_proto = skb->vlan_proto;
804 data->mac_proto = mac_proto;
805 data->l2_len = hlen;
806 memcpy(&data->l2_data, skb->data, hlen);
807
808 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
809 skb_pull(skb, hlen);
810}
811
812static void ovs_fragment(struct net *net, struct vport *vport,
813 struct sk_buff *skb, u16 mru,
814 struct sw_flow_key *key)
815{
816 u16 orig_network_offset = 0;
817
818 if (eth_p_mpls(skb->protocol)) {
819 orig_network_offset = skb_network_offset(skb);
820 skb->network_header = skb->inner_network_header;
821 }
822
823 if (skb_network_offset(skb) > MAX_L2_LEN) {
824 OVS_NLERR(1, "L2 header too long to fragment");
825 goto err;
826 }
827
828 if (key->eth.type == htons(ETH_P_IP)) {
829 struct dst_entry ovs_dst;
830 unsigned long orig_dst;
831
832 prepare_frag(vport, skb, orig_network_offset,
833 ovs_key_mac_proto(key));
834 dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1,
835 DST_OBSOLETE_NONE, DST_NOCOUNT);
836 ovs_dst.dev = vport->dev;
837
838 orig_dst = skb->_skb_refdst;
839 skb_dst_set_noref(skb, &ovs_dst);
840 IPCB(skb)->frag_max_size = mru;
841
842 ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
843 refdst_drop(orig_dst);
844 } else if (key->eth.type == htons(ETH_P_IPV6)) {
845 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
846 unsigned long orig_dst;
847 struct rt6_info ovs_rt;
848
849 if (!v6ops)
850 goto err;
851
852 prepare_frag(vport, skb, orig_network_offset,
853 ovs_key_mac_proto(key));
854 memset(&ovs_rt, 0, sizeof(ovs_rt));
855 dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
856 DST_OBSOLETE_NONE, DST_NOCOUNT);
857 ovs_rt.dst.dev = vport->dev;
858
859 orig_dst = skb->_skb_refdst;
860 skb_dst_set_noref(skb, &ovs_rt.dst);
861 IP6CB(skb)->frag_max_size = mru;
862
863 v6ops->fragment(net, skb->sk, skb, ovs_vport_output);
864 refdst_drop(orig_dst);
865 } else {
866 WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
867 ovs_vport_name(vport), ntohs(key->eth.type), mru,
868 vport->dev->mtu);
869 goto err;
870 }
871
872 return;
873err:
874 kfree_skb(skb);
875}
876
877static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
878 struct sw_flow_key *key)
879{
880 struct vport *vport = ovs_vport_rcu(dp, out_port);
881
882 if (likely(vport)) {
883 u16 mru = OVS_CB(skb)->mru;
884 u32 cutlen = OVS_CB(skb)->cutlen;
885
886 if (unlikely(cutlen > 0)) {
887 if (skb->len - cutlen > ovs_mac_header_len(key))
888 pskb_trim(skb, skb->len - cutlen);
889 else
890 pskb_trim(skb, ovs_mac_header_len(key));
891 }
892
893 if (likely(!mru ||
894 (skb->len <= mru + vport->dev->hard_header_len))) {
895 ovs_vport_send(vport, skb, ovs_key_mac_proto(key));
896 } else if (mru <= vport->dev->mtu) {
897 struct net *net = read_pnet(&dp->net);
898
899 ovs_fragment(net, vport, skb, mru, key);
900 } else {
901 kfree_skb(skb);
902 }
903 } else {
904 kfree_skb(skb);
905 }
906}
907
908static int output_userspace(struct datapath *dp, struct sk_buff *skb,
909 struct sw_flow_key *key, const struct nlattr *attr,
910 const struct nlattr *actions, int actions_len,
911 uint32_t cutlen)
912{
913 struct dp_upcall_info upcall;
914 const struct nlattr *a;
915 int rem;
916
917 memset(&upcall, 0, sizeof(upcall));
918 upcall.cmd = OVS_PACKET_CMD_ACTION;
919 upcall.mru = OVS_CB(skb)->mru;
920
921 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
922 a = nla_next(a, &rem)) {
923 switch (nla_type(a)) {
924 case OVS_USERSPACE_ATTR_USERDATA:
925 upcall.userdata = a;
926 break;
927
928 case OVS_USERSPACE_ATTR_PID:
929 upcall.portid = nla_get_u32(a);
930 break;
931
932 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
933 /* Get out tunnel info. */
934 struct vport *vport;
935
936 vport = ovs_vport_rcu(dp, nla_get_u32(a));
937 if (vport) {
938 int err;
939
940 err = dev_fill_metadata_dst(vport->dev, skb);
941 if (!err)
942 upcall.egress_tun_info = skb_tunnel_info(skb);
943 }
944
945 break;
946 }
947
948 case OVS_USERSPACE_ATTR_ACTIONS: {
949 /* Include actions. */
950 upcall.actions = actions;
951 upcall.actions_len = actions_len;
952 break;
953 }
954
955 } /* End of switch. */
956 }
957
958 return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
959}
960
961/* When 'last' is true, sample() should always consume the 'skb'.
962 * Otherwise, sample() should keep 'skb' intact regardless what
963 * actions are executed within sample().
964 */
965static int sample(struct datapath *dp, struct sk_buff *skb,
966 struct sw_flow_key *key, const struct nlattr *attr,
967 bool last)
968{
969 struct nlattr *actions;
970 struct nlattr *sample_arg;
971 int rem = nla_len(attr);
972 const struct sample_arg *arg;
973 bool clone_flow_key;
974
975 /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */
976 sample_arg = nla_data(attr);
977 arg = nla_data(sample_arg);
978 actions = nla_next(sample_arg, &rem);
979
980 if ((arg->probability != U32_MAX) &&
981 (!arg->probability || prandom_u32() > arg->probability)) {
982 if (last)
983 consume_skb(skb);
984 return 0;
985 }
986
987 clone_flow_key = !arg->exec;
988 return clone_execute(dp, skb, key, 0, actions, rem, last,
989 clone_flow_key);
990}
991
992/* When 'last' is true, clone() should always consume the 'skb'.
993 * Otherwise, clone() should keep 'skb' intact regardless what
994 * actions are executed within clone().
995 */
996static int clone(struct datapath *dp, struct sk_buff *skb,
997 struct sw_flow_key *key, const struct nlattr *attr,
998 bool last)
999{
1000 struct nlattr *actions;
1001 struct nlattr *clone_arg;
1002 int rem = nla_len(attr);
1003 bool dont_clone_flow_key;
1004
1005 /* The first action is always 'OVS_CLONE_ATTR_ARG'. */
1006 clone_arg = nla_data(attr);
1007 dont_clone_flow_key = nla_get_u32(clone_arg);
1008 actions = nla_next(clone_arg, &rem);
1009
1010 return clone_execute(dp, skb, key, 0, actions, rem, last,
1011 !dont_clone_flow_key);
1012}
1013
1014static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
1015 const struct nlattr *attr)
1016{
1017 struct ovs_action_hash *hash_act = nla_data(attr);
1018 u32 hash = 0;
1019
1020 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
1021 hash = skb_get_hash(skb);
1022 hash = jhash_1word(hash, hash_act->hash_basis);
1023 if (!hash)
1024 hash = 0x1;
1025
1026 key->ovs_flow_hash = hash;
1027}
1028
1029static int execute_set_action(struct sk_buff *skb,
1030 struct sw_flow_key *flow_key,
1031 const struct nlattr *a)
1032{
1033 /* Only tunnel set execution is supported without a mask. */
1034 if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
1035 struct ovs_tunnel_info *tun = nla_data(a);
1036
1037 skb_dst_drop(skb);
1038 dst_hold((struct dst_entry *)tun->tun_dst);
1039 skb_dst_set(skb, (struct dst_entry *)tun->tun_dst);
1040 return 0;
1041 }
1042
1043 return -EINVAL;
1044}
1045
1046/* Mask is at the midpoint of the data. */
1047#define get_mask(a, type) ((const type)nla_data(a) + 1)
1048
1049static int execute_masked_set_action(struct sk_buff *skb,
1050 struct sw_flow_key *flow_key,
1051 const struct nlattr *a)
1052{
1053 int err = 0;
1054
1055 switch (nla_type(a)) {
1056 case OVS_KEY_ATTR_PRIORITY:
1057 OVS_SET_MASKED(skb->priority, nla_get_u32(a),
1058 *get_mask(a, u32 *));
1059 flow_key->phy.priority = skb->priority;
1060 break;
1061
1062 case OVS_KEY_ATTR_SKB_MARK:
1063 OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
1064 flow_key->phy.skb_mark = skb->mark;
1065 break;
1066
1067 case OVS_KEY_ATTR_TUNNEL_INFO:
1068 /* Masked data not supported for tunnel. */
1069 err = -EINVAL;
1070 break;
1071
1072 case OVS_KEY_ATTR_ETHERNET:
1073 err = set_eth_addr(skb, flow_key, nla_data(a),
1074 get_mask(a, struct ovs_key_ethernet *));
1075 break;
1076
1077 case OVS_KEY_ATTR_NSH:
1078 err = set_nsh(skb, flow_key, a);
1079 break;
1080
1081 case OVS_KEY_ATTR_IPV4:
1082 err = set_ipv4(skb, flow_key, nla_data(a),
1083 get_mask(a, struct ovs_key_ipv4 *));
1084 break;
1085
1086 case OVS_KEY_ATTR_IPV6:
1087 err = set_ipv6(skb, flow_key, nla_data(a),
1088 get_mask(a, struct ovs_key_ipv6 *));
1089 break;
1090
1091 case OVS_KEY_ATTR_TCP:
1092 err = set_tcp(skb, flow_key, nla_data(a),
1093 get_mask(a, struct ovs_key_tcp *));
1094 break;
1095
1096 case OVS_KEY_ATTR_UDP:
1097 err = set_udp(skb, flow_key, nla_data(a),
1098 get_mask(a, struct ovs_key_udp *));
1099 break;
1100
1101 case OVS_KEY_ATTR_SCTP:
1102 err = set_sctp(skb, flow_key, nla_data(a),
1103 get_mask(a, struct ovs_key_sctp *));
1104 break;
1105
1106 case OVS_KEY_ATTR_MPLS:
1107 err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
1108 __be32 *));
1109 break;
1110
1111 case OVS_KEY_ATTR_CT_STATE:
1112 case OVS_KEY_ATTR_CT_ZONE:
1113 case OVS_KEY_ATTR_CT_MARK:
1114 case OVS_KEY_ATTR_CT_LABELS:
1115 case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
1116 case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
1117 err = -EINVAL;
1118 break;
1119 }
1120
1121 return err;
1122}
1123
1124static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
1125 struct sw_flow_key *key,
1126 const struct nlattr *a, bool last)
1127{
1128 u32 recirc_id;
1129
1130 if (!is_flow_key_valid(key)) {
1131 int err;
1132
1133 err = ovs_flow_key_update(skb, key);
1134 if (err)
1135 return err;
1136 }
1137 BUG_ON(!is_flow_key_valid(key));
1138
1139 recirc_id = nla_get_u32(a);
1140 return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true);
1141}
1142
1143static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb,
1144 struct sw_flow_key *key,
1145 const struct nlattr *attr, bool last)
1146{
1147 const struct nlattr *actions, *cpl_arg;
1148 const struct check_pkt_len_arg *arg;
1149 int rem = nla_len(attr);
1150 bool clone_flow_key;
1151
1152 /* The first netlink attribute in 'attr' is always
1153 * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
1154 */
1155 cpl_arg = nla_data(attr);
1156 arg = nla_data(cpl_arg);
1157
1158 if (skb->len <= arg->pkt_len) {
1159 /* Second netlink attribute in 'attr' is always
1160 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
1161 */
1162 actions = nla_next(cpl_arg, &rem);
1163 clone_flow_key = !arg->exec_for_lesser_equal;
1164 } else {
1165 /* Third netlink attribute in 'attr' is always
1166 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'.
1167 */
1168 actions = nla_next(cpl_arg, &rem);
1169 actions = nla_next(actions, &rem);
1170 clone_flow_key = !arg->exec_for_greater;
1171 }
1172
1173 return clone_execute(dp, skb, key, 0, nla_data(actions),
1174 nla_len(actions), last, clone_flow_key);
1175}
1176
1177/* Execute a list of actions against 'skb'. */
1178static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
1179 struct sw_flow_key *key,
1180 const struct nlattr *attr, int len)
1181{
1182 const struct nlattr *a;
1183 int rem;
1184
1185 for (a = attr, rem = len; rem > 0;
1186 a = nla_next(a, &rem)) {
1187 int err = 0;
1188
1189 switch (nla_type(a)) {
1190 case OVS_ACTION_ATTR_OUTPUT: {
1191 int port = nla_get_u32(a);
1192 struct sk_buff *clone;
1193
1194 /* Every output action needs a separate clone
1195 * of 'skb', In case the output action is the
1196 * last action, cloning can be avoided.
1197 */
1198 if (nla_is_last(a, rem)) {
1199 do_output(dp, skb, port, key);
1200 /* 'skb' has been used for output.
1201 */
1202 return 0;
1203 }
1204
1205 clone = skb_clone(skb, GFP_ATOMIC);
1206 if (clone)
1207 do_output(dp, clone, port, key);
1208 OVS_CB(skb)->cutlen = 0;
1209 break;
1210 }
1211
1212 case OVS_ACTION_ATTR_TRUNC: {
1213 struct ovs_action_trunc *trunc = nla_data(a);
1214
1215 if (skb->len > trunc->max_len)
1216 OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
1217 break;
1218 }
1219
1220 case OVS_ACTION_ATTR_USERSPACE:
1221 output_userspace(dp, skb, key, a, attr,
1222 len, OVS_CB(skb)->cutlen);
1223 OVS_CB(skb)->cutlen = 0;
1224 break;
1225
1226 case OVS_ACTION_ATTR_HASH:
1227 execute_hash(skb, key, a);
1228 break;
1229
1230 case OVS_ACTION_ATTR_PUSH_MPLS:
1231 err = push_mpls(skb, key, nla_data(a));
1232 break;
1233
1234 case OVS_ACTION_ATTR_POP_MPLS:
1235 err = pop_mpls(skb, key, nla_get_be16(a));
1236 break;
1237
1238 case OVS_ACTION_ATTR_PUSH_VLAN:
1239 err = push_vlan(skb, key, nla_data(a));
1240 break;
1241
1242 case OVS_ACTION_ATTR_POP_VLAN:
1243 err = pop_vlan(skb, key);
1244 break;
1245
1246 case OVS_ACTION_ATTR_RECIRC: {
1247 bool last = nla_is_last(a, rem);
1248
1249 err = execute_recirc(dp, skb, key, a, last);
1250 if (last) {
1251 /* If this is the last action, the skb has
1252 * been consumed or freed.
1253 * Return immediately.
1254 */
1255 return err;
1256 }
1257 break;
1258 }
1259
1260 case OVS_ACTION_ATTR_SET:
1261 err = execute_set_action(skb, key, nla_data(a));
1262 break;
1263
1264 case OVS_ACTION_ATTR_SET_MASKED:
1265 case OVS_ACTION_ATTR_SET_TO_MASKED:
1266 err = execute_masked_set_action(skb, key, nla_data(a));
1267 break;
1268
1269 case OVS_ACTION_ATTR_SAMPLE: {
1270 bool last = nla_is_last(a, rem);
1271
1272 err = sample(dp, skb, key, a, last);
1273 if (last)
1274 return err;
1275
1276 break;
1277 }
1278
1279 case OVS_ACTION_ATTR_CT:
1280 if (!is_flow_key_valid(key)) {
1281 err = ovs_flow_key_update(skb, key);
1282 if (err)
1283 return err;
1284 }
1285
1286 err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
1287 nla_data(a));
1288
1289 /* Hide stolen IP fragments from user space. */
1290 if (err)
1291 return err == -EINPROGRESS ? 0 : err;
1292 break;
1293
1294 case OVS_ACTION_ATTR_CT_CLEAR:
1295 err = ovs_ct_clear(skb, key);
1296 break;
1297
1298 case OVS_ACTION_ATTR_PUSH_ETH:
1299 err = push_eth(skb, key, nla_data(a));
1300 break;
1301
1302 case OVS_ACTION_ATTR_POP_ETH:
1303 err = pop_eth(skb, key);
1304 break;
1305
1306 case OVS_ACTION_ATTR_PUSH_NSH: {
1307 u8 buffer[NSH_HDR_MAX_LEN];
1308 struct nshhdr *nh = (struct nshhdr *)buffer;
1309
1310 err = nsh_hdr_from_nlattr(nla_data(a), nh,
1311 NSH_HDR_MAX_LEN);
1312 if (unlikely(err))
1313 break;
1314 err = push_nsh(skb, key, nh);
1315 break;
1316 }
1317
1318 case OVS_ACTION_ATTR_POP_NSH:
1319 err = pop_nsh(skb, key);
1320 break;
1321
1322 case OVS_ACTION_ATTR_METER:
1323 if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) {
1324 consume_skb(skb);
1325 return 0;
1326 }
1327 break;
1328
1329 case OVS_ACTION_ATTR_CLONE: {
1330 bool last = nla_is_last(a, rem);
1331
1332 err = clone(dp, skb, key, a, last);
1333 if (last)
1334 return err;
1335
1336 break;
1337 }
1338
1339 case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
1340 bool last = nla_is_last(a, rem);
1341
1342 err = execute_check_pkt_len(dp, skb, key, a, last);
1343 if (last)
1344 return err;
1345
1346 break;
1347 }
1348 }
1349
1350 if (unlikely(err)) {
1351 kfree_skb(skb);
1352 return err;
1353 }
1354 }
1355
1356 consume_skb(skb);
1357 return 0;
1358}
1359
1360/* Execute the actions on the clone of the packet. The effect of the
1361 * execution does not affect the original 'skb' nor the original 'key'.
1362 *
1363 * The execution may be deferred in case the actions can not be executed
1364 * immediately.
1365 */
1366static int clone_execute(struct datapath *dp, struct sk_buff *skb,
1367 struct sw_flow_key *key, u32 recirc_id,
1368 const struct nlattr *actions, int len,
1369 bool last, bool clone_flow_key)
1370{
1371 struct deferred_action *da;
1372 struct sw_flow_key *clone;
1373
1374 skb = last ? skb : skb_clone(skb, GFP_ATOMIC);
1375 if (!skb) {
1376 /* Out of memory, skip this action.
1377 */
1378 return 0;
1379 }
1380
1381 /* When clone_flow_key is false, the 'key' will not be change
1382 * by the actions, then the 'key' can be used directly.
1383 * Otherwise, try to clone key from the next recursion level of
1384 * 'flow_keys'. If clone is successful, execute the actions
1385 * without deferring.
1386 */
1387 clone = clone_flow_key ? clone_key(key) : key;
1388 if (clone) {
1389 int err = 0;
1390
1391 if (actions) { /* Sample action */
1392 if (clone_flow_key)
1393 __this_cpu_inc(exec_actions_level);
1394
1395 err = do_execute_actions(dp, skb, clone,
1396 actions, len);
1397
1398 if (clone_flow_key)
1399 __this_cpu_dec(exec_actions_level);
1400 } else { /* Recirc action */
1401 clone->recirc_id = recirc_id;
1402 ovs_dp_process_packet(skb, clone);
1403 }
1404 return err;
1405 }
1406
1407 /* Out of 'flow_keys' space. Defer actions */
1408 da = add_deferred_actions(skb, key, actions, len);
1409 if (da) {
1410 if (!actions) { /* Recirc action */
1411 key = &da->pkt_key;
1412 key->recirc_id = recirc_id;
1413 }
1414 } else {
1415 /* Out of per CPU action FIFO space. Drop the 'skb' and
1416 * log an error.
1417 */
1418 kfree_skb(skb);
1419
1420 if (net_ratelimit()) {
1421 if (actions) { /* Sample action */
1422 pr_warn("%s: deferred action limit reached, drop sample action\n",
1423 ovs_dp_name(dp));
1424 } else { /* Recirc action */
1425 pr_warn("%s: deferred action limit reached, drop recirc action\n",
1426 ovs_dp_name(dp));
1427 }
1428 }
1429 }
1430 return 0;
1431}
1432
1433static void process_deferred_actions(struct datapath *dp)
1434{
1435 struct action_fifo *fifo = this_cpu_ptr(action_fifos);
1436
1437 /* Do not touch the FIFO in case there is no deferred actions. */
1438 if (action_fifo_is_empty(fifo))
1439 return;
1440
1441 /* Finishing executing all deferred actions. */
1442 do {
1443 struct deferred_action *da = action_fifo_get(fifo);
1444 struct sk_buff *skb = da->skb;
1445 struct sw_flow_key *key = &da->pkt_key;
1446 const struct nlattr *actions = da->actions;
1447 int actions_len = da->actions_len;
1448
1449 if (actions)
1450 do_execute_actions(dp, skb, key, actions, actions_len);
1451 else
1452 ovs_dp_process_packet(skb, key);
1453 } while (!action_fifo_is_empty(fifo));
1454
1455 /* Reset FIFO for the next packet. */
1456 action_fifo_init(fifo);
1457}
1458
1459/* Execute a list of actions against 'skb'. */
1460int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
1461 const struct sw_flow_actions *acts,
1462 struct sw_flow_key *key)
1463{
1464 int err, level;
1465
1466 level = __this_cpu_inc_return(exec_actions_level);
1467 if (unlikely(level > OVS_RECURSION_LIMIT)) {
1468 net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
1469 ovs_dp_name(dp));
1470 kfree_skb(skb);
1471 err = -ENETDOWN;
1472 goto out;
1473 }
1474
1475 OVS_CB(skb)->acts_origlen = acts->orig_len;
1476 err = do_execute_actions(dp, skb, key,
1477 acts->actions, acts->actions_len);
1478
1479 if (level == 1)
1480 process_deferred_actions(dp);
1481
1482out:
1483 __this_cpu_dec(exec_actions_level);
1484 return err;
1485}
1486
1487int action_fifos_init(void)
1488{
1489 action_fifos = alloc_percpu(struct action_fifo);
1490 if (!action_fifos)
1491 return -ENOMEM;
1492
1493 flow_keys = alloc_percpu(struct action_flow_keys);
1494 if (!flow_keys) {
1495 free_percpu(action_fifos);
1496 return -ENOMEM;
1497 }
1498
1499 return 0;
1500}
1501
1502void action_fifos_exit(void)
1503{
1504 free_percpu(action_fifos);
1505 free_percpu(flow_keys);
1506}
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/netfilter_ipv6.h>
13#include <linux/sctp.h>
14#include <linux/tcp.h>
15#include <linux/udp.h>
16#include <linux/in6.h>
17#include <linux/if_arp.h>
18#include <linux/if_vlan.h>
19
20#include <net/dst.h>
21#include <net/ip.h>
22#include <net/ipv6.h>
23#include <net/ip6_fib.h>
24#include <net/checksum.h>
25#include <net/dsfield.h>
26#include <net/mpls.h>
27#include <net/sctp/checksum.h>
28
29#include "datapath.h"
30#include "flow.h"
31#include "conntrack.h"
32#include "vport.h"
33#include "flow_netlink.h"
34
35struct deferred_action {
36 struct sk_buff *skb;
37 const struct nlattr *actions;
38 int actions_len;
39
40 /* Store pkt_key clone when creating deferred action. */
41 struct sw_flow_key pkt_key;
42};
43
44#define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
45struct ovs_frag_data {
46 unsigned long dst;
47 struct vport *vport;
48 struct ovs_skb_cb cb;
49 __be16 inner_protocol;
50 u16 network_offset; /* valid only for MPLS */
51 u16 vlan_tci;
52 __be16 vlan_proto;
53 unsigned int l2_len;
54 u8 mac_proto;
55 u8 l2_data[MAX_L2_LEN];
56};
57
58static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
59
60#define DEFERRED_ACTION_FIFO_SIZE 10
61#define OVS_RECURSION_LIMIT 5
62#define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
63struct action_fifo {
64 int head;
65 int tail;
66 /* Deferred action fifo queue storage. */
67 struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
68};
69
70struct action_flow_keys {
71 struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
72};
73
74static struct action_fifo __percpu *action_fifos;
75static struct action_flow_keys __percpu *flow_keys;
76static DEFINE_PER_CPU(int, exec_actions_level);
77
78/* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
79 * space. Return NULL if out of key spaces.
80 */
81static struct sw_flow_key *clone_key(const struct sw_flow_key *key_)
82{
83 struct action_flow_keys *keys = this_cpu_ptr(flow_keys);
84 int level = this_cpu_read(exec_actions_level);
85 struct sw_flow_key *key = NULL;
86
87 if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
88 key = &keys->key[level - 1];
89 *key = *key_;
90 }
91
92 return key;
93}
94
95static void action_fifo_init(struct action_fifo *fifo)
96{
97 fifo->head = 0;
98 fifo->tail = 0;
99}
100
101static bool action_fifo_is_empty(const struct action_fifo *fifo)
102{
103 return (fifo->head == fifo->tail);
104}
105
106static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
107{
108 if (action_fifo_is_empty(fifo))
109 return NULL;
110
111 return &fifo->fifo[fifo->tail++];
112}
113
114static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
115{
116 if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
117 return NULL;
118
119 return &fifo->fifo[fifo->head++];
120}
121
122/* Return true if fifo is not full */
123static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
124 const struct sw_flow_key *key,
125 const struct nlattr *actions,
126 const int actions_len)
127{
128 struct action_fifo *fifo;
129 struct deferred_action *da;
130
131 fifo = this_cpu_ptr(action_fifos);
132 da = action_fifo_put(fifo);
133 if (da) {
134 da->skb = skb;
135 da->actions = actions;
136 da->actions_len = actions_len;
137 da->pkt_key = *key;
138 }
139
140 return da;
141}
142
143static void invalidate_flow_key(struct sw_flow_key *key)
144{
145 key->mac_proto |= SW_FLOW_KEY_INVALID;
146}
147
148static bool is_flow_key_valid(const struct sw_flow_key *key)
149{
150 return !(key->mac_proto & SW_FLOW_KEY_INVALID);
151}
152
153static int clone_execute(struct datapath *dp, struct sk_buff *skb,
154 struct sw_flow_key *key,
155 u32 recirc_id,
156 const struct nlattr *actions, int len,
157 bool last, bool clone_flow_key);
158
159static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
160 struct sw_flow_key *key,
161 const struct nlattr *attr, int len);
162
163static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
164 __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len)
165{
166 int err;
167
168 err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len);
169 if (err)
170 return err;
171
172 if (!mac_len)
173 key->mac_proto = MAC_PROTO_NONE;
174
175 invalidate_flow_key(key);
176 return 0;
177}
178
179static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
180 const __be16 ethertype)
181{
182 int err;
183
184 err = skb_mpls_pop(skb, ethertype, skb->mac_len,
185 ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET);
186 if (err)
187 return err;
188
189 if (ethertype == htons(ETH_P_TEB))
190 key->mac_proto = MAC_PROTO_ETHERNET;
191
192 invalidate_flow_key(key);
193 return 0;
194}
195
196static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
197 const __be32 *mpls_lse, const __be32 *mask)
198{
199 struct mpls_shim_hdr *stack;
200 __be32 lse;
201 int err;
202
203 stack = mpls_hdr(skb);
204 lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
205 err = skb_mpls_update_lse(skb, lse);
206 if (err)
207 return err;
208
209 flow_key->mpls.lse[0] = lse;
210 return 0;
211}
212
213static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
214{
215 int err;
216
217 err = skb_vlan_pop(skb);
218 if (skb_vlan_tag_present(skb)) {
219 invalidate_flow_key(key);
220 } else {
221 key->eth.vlan.tci = 0;
222 key->eth.vlan.tpid = 0;
223 }
224 return err;
225}
226
227static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
228 const struct ovs_action_push_vlan *vlan)
229{
230 if (skb_vlan_tag_present(skb)) {
231 invalidate_flow_key(key);
232 } else {
233 key->eth.vlan.tci = vlan->vlan_tci;
234 key->eth.vlan.tpid = vlan->vlan_tpid;
235 }
236 return skb_vlan_push(skb, vlan->vlan_tpid,
237 ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK);
238}
239
240/* 'src' is already properly masked. */
241static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
242{
243 u16 *dst = (u16 *)dst_;
244 const u16 *src = (const u16 *)src_;
245 const u16 *mask = (const u16 *)mask_;
246
247 OVS_SET_MASKED(dst[0], src[0], mask[0]);
248 OVS_SET_MASKED(dst[1], src[1], mask[1]);
249 OVS_SET_MASKED(dst[2], src[2], mask[2]);
250}
251
252static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
253 const struct ovs_key_ethernet *key,
254 const struct ovs_key_ethernet *mask)
255{
256 int err;
257
258 err = skb_ensure_writable(skb, ETH_HLEN);
259 if (unlikely(err))
260 return err;
261
262 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
263
264 ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
265 mask->eth_src);
266 ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
267 mask->eth_dst);
268
269 skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
270
271 ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
272 ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
273 return 0;
274}
275
276/* pop_eth does not support VLAN packets as this action is never called
277 * for them.
278 */
279static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
280{
281 skb_pull_rcsum(skb, ETH_HLEN);
282 skb_reset_mac_header(skb);
283 skb_reset_mac_len(skb);
284
285 /* safe right before invalidate_flow_key */
286 key->mac_proto = MAC_PROTO_NONE;
287 invalidate_flow_key(key);
288 return 0;
289}
290
291static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
292 const struct ovs_action_push_eth *ethh)
293{
294 struct ethhdr *hdr;
295
296 /* Add the new Ethernet header */
297 if (skb_cow_head(skb, ETH_HLEN) < 0)
298 return -ENOMEM;
299
300 skb_push(skb, ETH_HLEN);
301 skb_reset_mac_header(skb);
302 skb_reset_mac_len(skb);
303
304 hdr = eth_hdr(skb);
305 ether_addr_copy(hdr->h_source, ethh->addresses.eth_src);
306 ether_addr_copy(hdr->h_dest, ethh->addresses.eth_dst);
307 hdr->h_proto = skb->protocol;
308
309 skb_postpush_rcsum(skb, hdr, ETH_HLEN);
310
311 /* safe right before invalidate_flow_key */
312 key->mac_proto = MAC_PROTO_ETHERNET;
313 invalidate_flow_key(key);
314 return 0;
315}
316
317static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key,
318 const struct nshhdr *nh)
319{
320 int err;
321
322 err = nsh_push(skb, nh);
323 if (err)
324 return err;
325
326 /* safe right before invalidate_flow_key */
327 key->mac_proto = MAC_PROTO_NONE;
328 invalidate_flow_key(key);
329 return 0;
330}
331
332static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key)
333{
334 int err;
335
336 err = nsh_pop(skb);
337 if (err)
338 return err;
339
340 /* safe right before invalidate_flow_key */
341 if (skb->protocol == htons(ETH_P_TEB))
342 key->mac_proto = MAC_PROTO_ETHERNET;
343 else
344 key->mac_proto = MAC_PROTO_NONE;
345 invalidate_flow_key(key);
346 return 0;
347}
348
349static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh,
350 __be32 addr, __be32 new_addr)
351{
352 int transport_len = skb->len - skb_transport_offset(skb);
353
354 if (nh->frag_off & htons(IP_OFFSET))
355 return;
356
357 if (nh->protocol == IPPROTO_TCP) {
358 if (likely(transport_len >= sizeof(struct tcphdr)))
359 inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
360 addr, new_addr, true);
361 } else if (nh->protocol == IPPROTO_UDP) {
362 if (likely(transport_len >= sizeof(struct udphdr))) {
363 struct udphdr *uh = udp_hdr(skb);
364
365 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
366 inet_proto_csum_replace4(&uh->check, skb,
367 addr, new_addr, true);
368 if (!uh->check)
369 uh->check = CSUM_MANGLED_0;
370 }
371 }
372 }
373}
374
375static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
376 __be32 *addr, __be32 new_addr)
377{
378 update_ip_l4_checksum(skb, nh, *addr, new_addr);
379 csum_replace4(&nh->check, *addr, new_addr);
380 skb_clear_hash(skb);
381 *addr = new_addr;
382}
383
384static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
385 __be32 addr[4], const __be32 new_addr[4])
386{
387 int transport_len = skb->len - skb_transport_offset(skb);
388
389 if (l4_proto == NEXTHDR_TCP) {
390 if (likely(transport_len >= sizeof(struct tcphdr)))
391 inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
392 addr, new_addr, true);
393 } else if (l4_proto == NEXTHDR_UDP) {
394 if (likely(transport_len >= sizeof(struct udphdr))) {
395 struct udphdr *uh = udp_hdr(skb);
396
397 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
398 inet_proto_csum_replace16(&uh->check, skb,
399 addr, new_addr, true);
400 if (!uh->check)
401 uh->check = CSUM_MANGLED_0;
402 }
403 }
404 } else if (l4_proto == NEXTHDR_ICMP) {
405 if (likely(transport_len >= sizeof(struct icmp6hdr)))
406 inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
407 skb, addr, new_addr, true);
408 }
409}
410
411static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
412 const __be32 mask[4], __be32 masked[4])
413{
414 masked[0] = OVS_MASKED(old[0], addr[0], mask[0]);
415 masked[1] = OVS_MASKED(old[1], addr[1], mask[1]);
416 masked[2] = OVS_MASKED(old[2], addr[2], mask[2]);
417 masked[3] = OVS_MASKED(old[3], addr[3], mask[3]);
418}
419
420static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
421 __be32 addr[4], const __be32 new_addr[4],
422 bool recalculate_csum)
423{
424 if (recalculate_csum)
425 update_ipv6_checksum(skb, l4_proto, addr, new_addr);
426
427 skb_clear_hash(skb);
428 memcpy(addr, new_addr, sizeof(__be32[4]));
429}
430
431static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask)
432{
433 /* Bits 21-24 are always unmasked, so this retains their values. */
434 OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16));
435 OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8));
436 OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask);
437}
438
439static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
440 u8 mask)
441{
442 new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask);
443
444 csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
445 nh->ttl = new_ttl;
446}
447
448static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
449 const struct ovs_key_ipv4 *key,
450 const struct ovs_key_ipv4 *mask)
451{
452 struct iphdr *nh;
453 __be32 new_addr;
454 int err;
455
456 err = skb_ensure_writable(skb, skb_network_offset(skb) +
457 sizeof(struct iphdr));
458 if (unlikely(err))
459 return err;
460
461 nh = ip_hdr(skb);
462
463 /* Setting an IP addresses is typically only a side effect of
464 * matching on them in the current userspace implementation, so it
465 * makes sense to check if the value actually changed.
466 */
467 if (mask->ipv4_src) {
468 new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src);
469
470 if (unlikely(new_addr != nh->saddr)) {
471 set_ip_addr(skb, nh, &nh->saddr, new_addr);
472 flow_key->ipv4.addr.src = new_addr;
473 }
474 }
475 if (mask->ipv4_dst) {
476 new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst);
477
478 if (unlikely(new_addr != nh->daddr)) {
479 set_ip_addr(skb, nh, &nh->daddr, new_addr);
480 flow_key->ipv4.addr.dst = new_addr;
481 }
482 }
483 if (mask->ipv4_tos) {
484 ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos);
485 flow_key->ip.tos = nh->tos;
486 }
487 if (mask->ipv4_ttl) {
488 set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl);
489 flow_key->ip.ttl = nh->ttl;
490 }
491
492 return 0;
493}
494
495static bool is_ipv6_mask_nonzero(const __be32 addr[4])
496{
497 return !!(addr[0] | addr[1] | addr[2] | addr[3]);
498}
499
500static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key,
501 const struct ovs_key_ipv6 *key,
502 const struct ovs_key_ipv6 *mask)
503{
504 struct ipv6hdr *nh;
505 int err;
506
507 err = skb_ensure_writable(skb, skb_network_offset(skb) +
508 sizeof(struct ipv6hdr));
509 if (unlikely(err))
510 return err;
511
512 nh = ipv6_hdr(skb);
513
514 /* Setting an IP addresses is typically only a side effect of
515 * matching on them in the current userspace implementation, so it
516 * makes sense to check if the value actually changed.
517 */
518 if (is_ipv6_mask_nonzero(mask->ipv6_src)) {
519 __be32 *saddr = (__be32 *)&nh->saddr;
520 __be32 masked[4];
521
522 mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked);
523
524 if (unlikely(memcmp(saddr, masked, sizeof(masked)))) {
525 set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked,
526 true);
527 memcpy(&flow_key->ipv6.addr.src, masked,
528 sizeof(flow_key->ipv6.addr.src));
529 }
530 }
531 if (is_ipv6_mask_nonzero(mask->ipv6_dst)) {
532 unsigned int offset = 0;
533 int flags = IP6_FH_F_SKIP_RH;
534 bool recalc_csum = true;
535 __be32 *daddr = (__be32 *)&nh->daddr;
536 __be32 masked[4];
537
538 mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked);
539
540 if (unlikely(memcmp(daddr, masked, sizeof(masked)))) {
541 if (ipv6_ext_hdr(nh->nexthdr))
542 recalc_csum = (ipv6_find_hdr(skb, &offset,
543 NEXTHDR_ROUTING,
544 NULL, &flags)
545 != NEXTHDR_ROUTING);
546
547 set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked,
548 recalc_csum);
549 memcpy(&flow_key->ipv6.addr.dst, masked,
550 sizeof(flow_key->ipv6.addr.dst));
551 }
552 }
553 if (mask->ipv6_tclass) {
554 ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass);
555 flow_key->ip.tos = ipv6_get_dsfield(nh);
556 }
557 if (mask->ipv6_label) {
558 set_ipv6_fl(nh, ntohl(key->ipv6_label),
559 ntohl(mask->ipv6_label));
560 flow_key->ipv6.label =
561 *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
562 }
563 if (mask->ipv6_hlimit) {
564 OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit,
565 mask->ipv6_hlimit);
566 flow_key->ip.ttl = nh->hop_limit;
567 }
568 return 0;
569}
570
571static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key,
572 const struct nlattr *a)
573{
574 struct nshhdr *nh;
575 size_t length;
576 int err;
577 u8 flags;
578 u8 ttl;
579 int i;
580
581 struct ovs_key_nsh key;
582 struct ovs_key_nsh mask;
583
584 err = nsh_key_from_nlattr(a, &key, &mask);
585 if (err)
586 return err;
587
588 /* Make sure the NSH base header is there */
589 if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN))
590 return -ENOMEM;
591
592 nh = nsh_hdr(skb);
593 length = nsh_hdr_len(nh);
594
595 /* Make sure the whole NSH header is there */
596 err = skb_ensure_writable(skb, skb_network_offset(skb) +
597 length);
598 if (unlikely(err))
599 return err;
600
601 nh = nsh_hdr(skb);
602 skb_postpull_rcsum(skb, nh, length);
603 flags = nsh_get_flags(nh);
604 flags = OVS_MASKED(flags, key.base.flags, mask.base.flags);
605 flow_key->nsh.base.flags = flags;
606 ttl = nsh_get_ttl(nh);
607 ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl);
608 flow_key->nsh.base.ttl = ttl;
609 nsh_set_flags_and_ttl(nh, flags, ttl);
610 nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr,
611 mask.base.path_hdr);
612 flow_key->nsh.base.path_hdr = nh->path_hdr;
613 switch (nh->mdtype) {
614 case NSH_M_TYPE1:
615 for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) {
616 nh->md1.context[i] =
617 OVS_MASKED(nh->md1.context[i], key.context[i],
618 mask.context[i]);
619 }
620 memcpy(flow_key->nsh.context, nh->md1.context,
621 sizeof(nh->md1.context));
622 break;
623 case NSH_M_TYPE2:
624 memset(flow_key->nsh.context, 0,
625 sizeof(flow_key->nsh.context));
626 break;
627 default:
628 return -EINVAL;
629 }
630 skb_postpush_rcsum(skb, nh, length);
631 return 0;
632}
633
634/* Must follow skb_ensure_writable() since that can move the skb data. */
635static void set_tp_port(struct sk_buff *skb, __be16 *port,
636 __be16 new_port, __sum16 *check)
637{
638 inet_proto_csum_replace2(check, skb, *port, new_port, false);
639 *port = new_port;
640}
641
642static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key,
643 const struct ovs_key_udp *key,
644 const struct ovs_key_udp *mask)
645{
646 struct udphdr *uh;
647 __be16 src, dst;
648 int err;
649
650 err = skb_ensure_writable(skb, skb_transport_offset(skb) +
651 sizeof(struct udphdr));
652 if (unlikely(err))
653 return err;
654
655 uh = udp_hdr(skb);
656 /* Either of the masks is non-zero, so do not bother checking them. */
657 src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src);
658 dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst);
659
660 if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
661 if (likely(src != uh->source)) {
662 set_tp_port(skb, &uh->source, src, &uh->check);
663 flow_key->tp.src = src;
664 }
665 if (likely(dst != uh->dest)) {
666 set_tp_port(skb, &uh->dest, dst, &uh->check);
667 flow_key->tp.dst = dst;
668 }
669
670 if (unlikely(!uh->check))
671 uh->check = CSUM_MANGLED_0;
672 } else {
673 uh->source = src;
674 uh->dest = dst;
675 flow_key->tp.src = src;
676 flow_key->tp.dst = dst;
677 }
678
679 skb_clear_hash(skb);
680
681 return 0;
682}
683
684static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key,
685 const struct ovs_key_tcp *key,
686 const struct ovs_key_tcp *mask)
687{
688 struct tcphdr *th;
689 __be16 src, dst;
690 int err;
691
692 err = skb_ensure_writable(skb, skb_transport_offset(skb) +
693 sizeof(struct tcphdr));
694 if (unlikely(err))
695 return err;
696
697 th = tcp_hdr(skb);
698 src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src);
699 if (likely(src != th->source)) {
700 set_tp_port(skb, &th->source, src, &th->check);
701 flow_key->tp.src = src;
702 }
703 dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst);
704 if (likely(dst != th->dest)) {
705 set_tp_port(skb, &th->dest, dst, &th->check);
706 flow_key->tp.dst = dst;
707 }
708 skb_clear_hash(skb);
709
710 return 0;
711}
712
713static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
714 const struct ovs_key_sctp *key,
715 const struct ovs_key_sctp *mask)
716{
717 unsigned int sctphoff = skb_transport_offset(skb);
718 struct sctphdr *sh;
719 __le32 old_correct_csum, new_csum, old_csum;
720 int err;
721
722 err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
723 if (unlikely(err))
724 return err;
725
726 sh = sctp_hdr(skb);
727 old_csum = sh->checksum;
728 old_correct_csum = sctp_compute_cksum(skb, sctphoff);
729
730 sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src);
731 sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst);
732
733 new_csum = sctp_compute_cksum(skb, sctphoff);
734
735 /* Carry any checksum errors through. */
736 sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
737
738 skb_clear_hash(skb);
739 flow_key->tp.src = sh->source;
740 flow_key->tp.dst = sh->dest;
741
742 return 0;
743}
744
745static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *skb)
746{
747 struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
748 struct vport *vport = data->vport;
749
750 if (skb_cow_head(skb, data->l2_len) < 0) {
751 kfree_skb(skb);
752 return -ENOMEM;
753 }
754
755 __skb_dst_copy(skb, data->dst);
756 *OVS_CB(skb) = data->cb;
757 skb->inner_protocol = data->inner_protocol;
758 if (data->vlan_tci & VLAN_CFI_MASK)
759 __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK);
760 else
761 __vlan_hwaccel_clear_tag(skb);
762
763 /* Reconstruct the MAC header. */
764 skb_push(skb, data->l2_len);
765 memcpy(skb->data, &data->l2_data, data->l2_len);
766 skb_postpush_rcsum(skb, skb->data, data->l2_len);
767 skb_reset_mac_header(skb);
768
769 if (eth_p_mpls(skb->protocol)) {
770 skb->inner_network_header = skb->network_header;
771 skb_set_network_header(skb, data->network_offset);
772 skb_reset_mac_len(skb);
773 }
774
775 ovs_vport_send(vport, skb, data->mac_proto);
776 return 0;
777}
778
779static unsigned int
780ovs_dst_get_mtu(const struct dst_entry *dst)
781{
782 return dst->dev->mtu;
783}
784
785static struct dst_ops ovs_dst_ops = {
786 .family = AF_UNSPEC,
787 .mtu = ovs_dst_get_mtu,
788};
789
790/* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
791 * ovs_vport_output(), which is called once per fragmented packet.
792 */
793static void prepare_frag(struct vport *vport, struct sk_buff *skb,
794 u16 orig_network_offset, u8 mac_proto)
795{
796 unsigned int hlen = skb_network_offset(skb);
797 struct ovs_frag_data *data;
798
799 data = this_cpu_ptr(&ovs_frag_data_storage);
800 data->dst = skb->_skb_refdst;
801 data->vport = vport;
802 data->cb = *OVS_CB(skb);
803 data->inner_protocol = skb->inner_protocol;
804 data->network_offset = orig_network_offset;
805 if (skb_vlan_tag_present(skb))
806 data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK;
807 else
808 data->vlan_tci = 0;
809 data->vlan_proto = skb->vlan_proto;
810 data->mac_proto = mac_proto;
811 data->l2_len = hlen;
812 memcpy(&data->l2_data, skb->data, hlen);
813
814 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
815 skb_pull(skb, hlen);
816}
817
818static void ovs_fragment(struct net *net, struct vport *vport,
819 struct sk_buff *skb, u16 mru,
820 struct sw_flow_key *key)
821{
822 u16 orig_network_offset = 0;
823
824 if (eth_p_mpls(skb->protocol)) {
825 orig_network_offset = skb_network_offset(skb);
826 skb->network_header = skb->inner_network_header;
827 }
828
829 if (skb_network_offset(skb) > MAX_L2_LEN) {
830 OVS_NLERR(1, "L2 header too long to fragment");
831 goto err;
832 }
833
834 if (key->eth.type == htons(ETH_P_IP)) {
835 struct dst_entry ovs_dst;
836 unsigned long orig_dst;
837
838 prepare_frag(vport, skb, orig_network_offset,
839 ovs_key_mac_proto(key));
840 dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1,
841 DST_OBSOLETE_NONE, DST_NOCOUNT);
842 ovs_dst.dev = vport->dev;
843
844 orig_dst = skb->_skb_refdst;
845 skb_dst_set_noref(skb, &ovs_dst);
846 IPCB(skb)->frag_max_size = mru;
847
848 ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
849 refdst_drop(orig_dst);
850 } else if (key->eth.type == htons(ETH_P_IPV6)) {
851 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
852 unsigned long orig_dst;
853 struct rt6_info ovs_rt;
854
855 if (!v6ops)
856 goto err;
857
858 prepare_frag(vport, skb, orig_network_offset,
859 ovs_key_mac_proto(key));
860 memset(&ovs_rt, 0, sizeof(ovs_rt));
861 dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
862 DST_OBSOLETE_NONE, DST_NOCOUNT);
863 ovs_rt.dst.dev = vport->dev;
864
865 orig_dst = skb->_skb_refdst;
866 skb_dst_set_noref(skb, &ovs_rt.dst);
867 IP6CB(skb)->frag_max_size = mru;
868
869 v6ops->fragment(net, skb->sk, skb, ovs_vport_output);
870 refdst_drop(orig_dst);
871 } else {
872 WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
873 ovs_vport_name(vport), ntohs(key->eth.type), mru,
874 vport->dev->mtu);
875 goto err;
876 }
877
878 return;
879err:
880 kfree_skb(skb);
881}
882
883static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
884 struct sw_flow_key *key)
885{
886 struct vport *vport = ovs_vport_rcu(dp, out_port);
887
888 if (likely(vport)) {
889 u16 mru = OVS_CB(skb)->mru;
890 u32 cutlen = OVS_CB(skb)->cutlen;
891
892 if (unlikely(cutlen > 0)) {
893 if (skb->len - cutlen > ovs_mac_header_len(key))
894 pskb_trim(skb, skb->len - cutlen);
895 else
896 pskb_trim(skb, ovs_mac_header_len(key));
897 }
898
899 if (likely(!mru ||
900 (skb->len <= mru + vport->dev->hard_header_len))) {
901 ovs_vport_send(vport, skb, ovs_key_mac_proto(key));
902 } else if (mru <= vport->dev->mtu) {
903 struct net *net = read_pnet(&dp->net);
904
905 ovs_fragment(net, vport, skb, mru, key);
906 } else {
907 kfree_skb(skb);
908 }
909 } else {
910 kfree_skb(skb);
911 }
912}
913
914static int output_userspace(struct datapath *dp, struct sk_buff *skb,
915 struct sw_flow_key *key, const struct nlattr *attr,
916 const struct nlattr *actions, int actions_len,
917 uint32_t cutlen)
918{
919 struct dp_upcall_info upcall;
920 const struct nlattr *a;
921 int rem;
922
923 memset(&upcall, 0, sizeof(upcall));
924 upcall.cmd = OVS_PACKET_CMD_ACTION;
925 upcall.mru = OVS_CB(skb)->mru;
926
927 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
928 a = nla_next(a, &rem)) {
929 switch (nla_type(a)) {
930 case OVS_USERSPACE_ATTR_USERDATA:
931 upcall.userdata = a;
932 break;
933
934 case OVS_USERSPACE_ATTR_PID:
935 upcall.portid = nla_get_u32(a);
936 break;
937
938 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
939 /* Get out tunnel info. */
940 struct vport *vport;
941
942 vport = ovs_vport_rcu(dp, nla_get_u32(a));
943 if (vport) {
944 int err;
945
946 err = dev_fill_metadata_dst(vport->dev, skb);
947 if (!err)
948 upcall.egress_tun_info = skb_tunnel_info(skb);
949 }
950
951 break;
952 }
953
954 case OVS_USERSPACE_ATTR_ACTIONS: {
955 /* Include actions. */
956 upcall.actions = actions;
957 upcall.actions_len = actions_len;
958 break;
959 }
960
961 } /* End of switch. */
962 }
963
964 return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
965}
966
967static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb,
968 struct sw_flow_key *key,
969 const struct nlattr *attr, bool last)
970{
971 /* The first action is always 'OVS_DEC_TTL_ATTR_ARG'. */
972 struct nlattr *dec_ttl_arg = nla_data(attr);
973 int rem = nla_len(attr);
974
975 if (nla_len(dec_ttl_arg)) {
976 struct nlattr *actions = nla_next(dec_ttl_arg, &rem);
977
978 if (actions)
979 return clone_execute(dp, skb, key, 0, actions, rem,
980 last, false);
981 }
982 consume_skb(skb);
983 return 0;
984}
985
986/* When 'last' is true, sample() should always consume the 'skb'.
987 * Otherwise, sample() should keep 'skb' intact regardless what
988 * actions are executed within sample().
989 */
990static int sample(struct datapath *dp, struct sk_buff *skb,
991 struct sw_flow_key *key, const struct nlattr *attr,
992 bool last)
993{
994 struct nlattr *actions;
995 struct nlattr *sample_arg;
996 int rem = nla_len(attr);
997 const struct sample_arg *arg;
998 bool clone_flow_key;
999
1000 /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */
1001 sample_arg = nla_data(attr);
1002 arg = nla_data(sample_arg);
1003 actions = nla_next(sample_arg, &rem);
1004
1005 if ((arg->probability != U32_MAX) &&
1006 (!arg->probability || prandom_u32() > arg->probability)) {
1007 if (last)
1008 consume_skb(skb);
1009 return 0;
1010 }
1011
1012 clone_flow_key = !arg->exec;
1013 return clone_execute(dp, skb, key, 0, actions, rem, last,
1014 clone_flow_key);
1015}
1016
1017/* When 'last' is true, clone() should always consume the 'skb'.
1018 * Otherwise, clone() should keep 'skb' intact regardless what
1019 * actions are executed within clone().
1020 */
1021static int clone(struct datapath *dp, struct sk_buff *skb,
1022 struct sw_flow_key *key, const struct nlattr *attr,
1023 bool last)
1024{
1025 struct nlattr *actions;
1026 struct nlattr *clone_arg;
1027 int rem = nla_len(attr);
1028 bool dont_clone_flow_key;
1029
1030 /* The first action is always 'OVS_CLONE_ATTR_ARG'. */
1031 clone_arg = nla_data(attr);
1032 dont_clone_flow_key = nla_get_u32(clone_arg);
1033 actions = nla_next(clone_arg, &rem);
1034
1035 return clone_execute(dp, skb, key, 0, actions, rem, last,
1036 !dont_clone_flow_key);
1037}
1038
1039static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
1040 const struct nlattr *attr)
1041{
1042 struct ovs_action_hash *hash_act = nla_data(attr);
1043 u32 hash = 0;
1044
1045 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
1046 hash = skb_get_hash(skb);
1047 hash = jhash_1word(hash, hash_act->hash_basis);
1048 if (!hash)
1049 hash = 0x1;
1050
1051 key->ovs_flow_hash = hash;
1052}
1053
1054static int execute_set_action(struct sk_buff *skb,
1055 struct sw_flow_key *flow_key,
1056 const struct nlattr *a)
1057{
1058 /* Only tunnel set execution is supported without a mask. */
1059 if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
1060 struct ovs_tunnel_info *tun = nla_data(a);
1061
1062 skb_dst_drop(skb);
1063 dst_hold((struct dst_entry *)tun->tun_dst);
1064 skb_dst_set(skb, (struct dst_entry *)tun->tun_dst);
1065 return 0;
1066 }
1067
1068 return -EINVAL;
1069}
1070
1071/* Mask is at the midpoint of the data. */
1072#define get_mask(a, type) ((const type)nla_data(a) + 1)
1073
1074static int execute_masked_set_action(struct sk_buff *skb,
1075 struct sw_flow_key *flow_key,
1076 const struct nlattr *a)
1077{
1078 int err = 0;
1079
1080 switch (nla_type(a)) {
1081 case OVS_KEY_ATTR_PRIORITY:
1082 OVS_SET_MASKED(skb->priority, nla_get_u32(a),
1083 *get_mask(a, u32 *));
1084 flow_key->phy.priority = skb->priority;
1085 break;
1086
1087 case OVS_KEY_ATTR_SKB_MARK:
1088 OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
1089 flow_key->phy.skb_mark = skb->mark;
1090 break;
1091
1092 case OVS_KEY_ATTR_TUNNEL_INFO:
1093 /* Masked data not supported for tunnel. */
1094 err = -EINVAL;
1095 break;
1096
1097 case OVS_KEY_ATTR_ETHERNET:
1098 err = set_eth_addr(skb, flow_key, nla_data(a),
1099 get_mask(a, struct ovs_key_ethernet *));
1100 break;
1101
1102 case OVS_KEY_ATTR_NSH:
1103 err = set_nsh(skb, flow_key, a);
1104 break;
1105
1106 case OVS_KEY_ATTR_IPV4:
1107 err = set_ipv4(skb, flow_key, nla_data(a),
1108 get_mask(a, struct ovs_key_ipv4 *));
1109 break;
1110
1111 case OVS_KEY_ATTR_IPV6:
1112 err = set_ipv6(skb, flow_key, nla_data(a),
1113 get_mask(a, struct ovs_key_ipv6 *));
1114 break;
1115
1116 case OVS_KEY_ATTR_TCP:
1117 err = set_tcp(skb, flow_key, nla_data(a),
1118 get_mask(a, struct ovs_key_tcp *));
1119 break;
1120
1121 case OVS_KEY_ATTR_UDP:
1122 err = set_udp(skb, flow_key, nla_data(a),
1123 get_mask(a, struct ovs_key_udp *));
1124 break;
1125
1126 case OVS_KEY_ATTR_SCTP:
1127 err = set_sctp(skb, flow_key, nla_data(a),
1128 get_mask(a, struct ovs_key_sctp *));
1129 break;
1130
1131 case OVS_KEY_ATTR_MPLS:
1132 err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
1133 __be32 *));
1134 break;
1135
1136 case OVS_KEY_ATTR_CT_STATE:
1137 case OVS_KEY_ATTR_CT_ZONE:
1138 case OVS_KEY_ATTR_CT_MARK:
1139 case OVS_KEY_ATTR_CT_LABELS:
1140 case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
1141 case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
1142 err = -EINVAL;
1143 break;
1144 }
1145
1146 return err;
1147}
1148
1149static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
1150 struct sw_flow_key *key,
1151 const struct nlattr *a, bool last)
1152{
1153 u32 recirc_id;
1154
1155 if (!is_flow_key_valid(key)) {
1156 int err;
1157
1158 err = ovs_flow_key_update(skb, key);
1159 if (err)
1160 return err;
1161 }
1162 BUG_ON(!is_flow_key_valid(key));
1163
1164 recirc_id = nla_get_u32(a);
1165 return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true);
1166}
1167
1168static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb,
1169 struct sw_flow_key *key,
1170 const struct nlattr *attr, bool last)
1171{
1172 struct ovs_skb_cb *ovs_cb = OVS_CB(skb);
1173 const struct nlattr *actions, *cpl_arg;
1174 int len, max_len, rem = nla_len(attr);
1175 const struct check_pkt_len_arg *arg;
1176 bool clone_flow_key;
1177
1178 /* The first netlink attribute in 'attr' is always
1179 * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
1180 */
1181 cpl_arg = nla_data(attr);
1182 arg = nla_data(cpl_arg);
1183
1184 len = ovs_cb->mru ? ovs_cb->mru + skb->mac_len : skb->len;
1185 max_len = arg->pkt_len;
1186
1187 if ((skb_is_gso(skb) && skb_gso_validate_mac_len(skb, max_len)) ||
1188 len <= max_len) {
1189 /* Second netlink attribute in 'attr' is always
1190 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
1191 */
1192 actions = nla_next(cpl_arg, &rem);
1193 clone_flow_key = !arg->exec_for_lesser_equal;
1194 } else {
1195 /* Third netlink attribute in 'attr' is always
1196 * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'.
1197 */
1198 actions = nla_next(cpl_arg, &rem);
1199 actions = nla_next(actions, &rem);
1200 clone_flow_key = !arg->exec_for_greater;
1201 }
1202
1203 return clone_execute(dp, skb, key, 0, nla_data(actions),
1204 nla_len(actions), last, clone_flow_key);
1205}
1206
1207static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key)
1208{
1209 int err;
1210
1211 if (skb->protocol == htons(ETH_P_IPV6)) {
1212 struct ipv6hdr *nh;
1213
1214 err = skb_ensure_writable(skb, skb_network_offset(skb) +
1215 sizeof(*nh));
1216 if (unlikely(err))
1217 return err;
1218
1219 nh = ipv6_hdr(skb);
1220
1221 if (nh->hop_limit <= 1)
1222 return -EHOSTUNREACH;
1223
1224 key->ip.ttl = --nh->hop_limit;
1225 } else {
1226 struct iphdr *nh;
1227 u8 old_ttl;
1228
1229 err = skb_ensure_writable(skb, skb_network_offset(skb) +
1230 sizeof(*nh));
1231 if (unlikely(err))
1232 return err;
1233
1234 nh = ip_hdr(skb);
1235 if (nh->ttl <= 1)
1236 return -EHOSTUNREACH;
1237
1238 old_ttl = nh->ttl--;
1239 csum_replace2(&nh->check, htons(old_ttl << 8),
1240 htons(nh->ttl << 8));
1241 key->ip.ttl = nh->ttl;
1242 }
1243 return 0;
1244}
1245
1246/* Execute a list of actions against 'skb'. */
1247static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
1248 struct sw_flow_key *key,
1249 const struct nlattr *attr, int len)
1250{
1251 const struct nlattr *a;
1252 int rem;
1253
1254 for (a = attr, rem = len; rem > 0;
1255 a = nla_next(a, &rem)) {
1256 int err = 0;
1257
1258 switch (nla_type(a)) {
1259 case OVS_ACTION_ATTR_OUTPUT: {
1260 int port = nla_get_u32(a);
1261 struct sk_buff *clone;
1262
1263 /* Every output action needs a separate clone
1264 * of 'skb', In case the output action is the
1265 * last action, cloning can be avoided.
1266 */
1267 if (nla_is_last(a, rem)) {
1268 do_output(dp, skb, port, key);
1269 /* 'skb' has been used for output.
1270 */
1271 return 0;
1272 }
1273
1274 clone = skb_clone(skb, GFP_ATOMIC);
1275 if (clone)
1276 do_output(dp, clone, port, key);
1277 OVS_CB(skb)->cutlen = 0;
1278 break;
1279 }
1280
1281 case OVS_ACTION_ATTR_TRUNC: {
1282 struct ovs_action_trunc *trunc = nla_data(a);
1283
1284 if (skb->len > trunc->max_len)
1285 OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
1286 break;
1287 }
1288
1289 case OVS_ACTION_ATTR_USERSPACE:
1290 output_userspace(dp, skb, key, a, attr,
1291 len, OVS_CB(skb)->cutlen);
1292 OVS_CB(skb)->cutlen = 0;
1293 break;
1294
1295 case OVS_ACTION_ATTR_HASH:
1296 execute_hash(skb, key, a);
1297 break;
1298
1299 case OVS_ACTION_ATTR_PUSH_MPLS: {
1300 struct ovs_action_push_mpls *mpls = nla_data(a);
1301
1302 err = push_mpls(skb, key, mpls->mpls_lse,
1303 mpls->mpls_ethertype, skb->mac_len);
1304 break;
1305 }
1306 case OVS_ACTION_ATTR_ADD_MPLS: {
1307 struct ovs_action_add_mpls *mpls = nla_data(a);
1308 __u16 mac_len = 0;
1309
1310 if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK)
1311 mac_len = skb->mac_len;
1312
1313 err = push_mpls(skb, key, mpls->mpls_lse,
1314 mpls->mpls_ethertype, mac_len);
1315 break;
1316 }
1317 case OVS_ACTION_ATTR_POP_MPLS:
1318 err = pop_mpls(skb, key, nla_get_be16(a));
1319 break;
1320
1321 case OVS_ACTION_ATTR_PUSH_VLAN:
1322 err = push_vlan(skb, key, nla_data(a));
1323 break;
1324
1325 case OVS_ACTION_ATTR_POP_VLAN:
1326 err = pop_vlan(skb, key);
1327 break;
1328
1329 case OVS_ACTION_ATTR_RECIRC: {
1330 bool last = nla_is_last(a, rem);
1331
1332 err = execute_recirc(dp, skb, key, a, last);
1333 if (last) {
1334 /* If this is the last action, the skb has
1335 * been consumed or freed.
1336 * Return immediately.
1337 */
1338 return err;
1339 }
1340 break;
1341 }
1342
1343 case OVS_ACTION_ATTR_SET:
1344 err = execute_set_action(skb, key, nla_data(a));
1345 break;
1346
1347 case OVS_ACTION_ATTR_SET_MASKED:
1348 case OVS_ACTION_ATTR_SET_TO_MASKED:
1349 err = execute_masked_set_action(skb, key, nla_data(a));
1350 break;
1351
1352 case OVS_ACTION_ATTR_SAMPLE: {
1353 bool last = nla_is_last(a, rem);
1354
1355 err = sample(dp, skb, key, a, last);
1356 if (last)
1357 return err;
1358
1359 break;
1360 }
1361
1362 case OVS_ACTION_ATTR_CT:
1363 if (!is_flow_key_valid(key)) {
1364 err = ovs_flow_key_update(skb, key);
1365 if (err)
1366 return err;
1367 }
1368
1369 err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
1370 nla_data(a));
1371
1372 /* Hide stolen IP fragments from user space. */
1373 if (err)
1374 return err == -EINPROGRESS ? 0 : err;
1375 break;
1376
1377 case OVS_ACTION_ATTR_CT_CLEAR:
1378 err = ovs_ct_clear(skb, key);
1379 break;
1380
1381 case OVS_ACTION_ATTR_PUSH_ETH:
1382 err = push_eth(skb, key, nla_data(a));
1383 break;
1384
1385 case OVS_ACTION_ATTR_POP_ETH:
1386 err = pop_eth(skb, key);
1387 break;
1388
1389 case OVS_ACTION_ATTR_PUSH_NSH: {
1390 u8 buffer[NSH_HDR_MAX_LEN];
1391 struct nshhdr *nh = (struct nshhdr *)buffer;
1392
1393 err = nsh_hdr_from_nlattr(nla_data(a), nh,
1394 NSH_HDR_MAX_LEN);
1395 if (unlikely(err))
1396 break;
1397 err = push_nsh(skb, key, nh);
1398 break;
1399 }
1400
1401 case OVS_ACTION_ATTR_POP_NSH:
1402 err = pop_nsh(skb, key);
1403 break;
1404
1405 case OVS_ACTION_ATTR_METER:
1406 if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) {
1407 consume_skb(skb);
1408 return 0;
1409 }
1410 break;
1411
1412 case OVS_ACTION_ATTR_CLONE: {
1413 bool last = nla_is_last(a, rem);
1414
1415 err = clone(dp, skb, key, a, last);
1416 if (last)
1417 return err;
1418
1419 break;
1420 }
1421
1422 case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
1423 bool last = nla_is_last(a, rem);
1424
1425 err = execute_check_pkt_len(dp, skb, key, a, last);
1426 if (last)
1427 return err;
1428
1429 break;
1430 }
1431
1432 case OVS_ACTION_ATTR_DEC_TTL:
1433 err = execute_dec_ttl(skb, key);
1434 if (err == -EHOSTUNREACH) {
1435 err = dec_ttl_exception_handler(dp, skb, key,
1436 a, true);
1437 return err;
1438 }
1439 break;
1440 }
1441
1442 if (unlikely(err)) {
1443 kfree_skb(skb);
1444 return err;
1445 }
1446 }
1447
1448 consume_skb(skb);
1449 return 0;
1450}
1451
1452/* Execute the actions on the clone of the packet. The effect of the
1453 * execution does not affect the original 'skb' nor the original 'key'.
1454 *
1455 * The execution may be deferred in case the actions can not be executed
1456 * immediately.
1457 */
1458static int clone_execute(struct datapath *dp, struct sk_buff *skb,
1459 struct sw_flow_key *key, u32 recirc_id,
1460 const struct nlattr *actions, int len,
1461 bool last, bool clone_flow_key)
1462{
1463 struct deferred_action *da;
1464 struct sw_flow_key *clone;
1465
1466 skb = last ? skb : skb_clone(skb, GFP_ATOMIC);
1467 if (!skb) {
1468 /* Out of memory, skip this action.
1469 */
1470 return 0;
1471 }
1472
1473 /* When clone_flow_key is false, the 'key' will not be change
1474 * by the actions, then the 'key' can be used directly.
1475 * Otherwise, try to clone key from the next recursion level of
1476 * 'flow_keys'. If clone is successful, execute the actions
1477 * without deferring.
1478 */
1479 clone = clone_flow_key ? clone_key(key) : key;
1480 if (clone) {
1481 int err = 0;
1482
1483 if (actions) { /* Sample action */
1484 if (clone_flow_key)
1485 __this_cpu_inc(exec_actions_level);
1486
1487 err = do_execute_actions(dp, skb, clone,
1488 actions, len);
1489
1490 if (clone_flow_key)
1491 __this_cpu_dec(exec_actions_level);
1492 } else { /* Recirc action */
1493 clone->recirc_id = recirc_id;
1494 ovs_dp_process_packet(skb, clone);
1495 }
1496 return err;
1497 }
1498
1499 /* Out of 'flow_keys' space. Defer actions */
1500 da = add_deferred_actions(skb, key, actions, len);
1501 if (da) {
1502 if (!actions) { /* Recirc action */
1503 key = &da->pkt_key;
1504 key->recirc_id = recirc_id;
1505 }
1506 } else {
1507 /* Out of per CPU action FIFO space. Drop the 'skb' and
1508 * log an error.
1509 */
1510 kfree_skb(skb);
1511
1512 if (net_ratelimit()) {
1513 if (actions) { /* Sample action */
1514 pr_warn("%s: deferred action limit reached, drop sample action\n",
1515 ovs_dp_name(dp));
1516 } else { /* Recirc action */
1517 pr_warn("%s: deferred action limit reached, drop recirc action\n",
1518 ovs_dp_name(dp));
1519 }
1520 }
1521 }
1522 return 0;
1523}
1524
1525static void process_deferred_actions(struct datapath *dp)
1526{
1527 struct action_fifo *fifo = this_cpu_ptr(action_fifos);
1528
1529 /* Do not touch the FIFO in case there is no deferred actions. */
1530 if (action_fifo_is_empty(fifo))
1531 return;
1532
1533 /* Finishing executing all deferred actions. */
1534 do {
1535 struct deferred_action *da = action_fifo_get(fifo);
1536 struct sk_buff *skb = da->skb;
1537 struct sw_flow_key *key = &da->pkt_key;
1538 const struct nlattr *actions = da->actions;
1539 int actions_len = da->actions_len;
1540
1541 if (actions)
1542 do_execute_actions(dp, skb, key, actions, actions_len);
1543 else
1544 ovs_dp_process_packet(skb, key);
1545 } while (!action_fifo_is_empty(fifo));
1546
1547 /* Reset FIFO for the next packet. */
1548 action_fifo_init(fifo);
1549}
1550
1551/* Execute a list of actions against 'skb'. */
1552int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
1553 const struct sw_flow_actions *acts,
1554 struct sw_flow_key *key)
1555{
1556 int err, level;
1557
1558 level = __this_cpu_inc_return(exec_actions_level);
1559 if (unlikely(level > OVS_RECURSION_LIMIT)) {
1560 net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
1561 ovs_dp_name(dp));
1562 kfree_skb(skb);
1563 err = -ENETDOWN;
1564 goto out;
1565 }
1566
1567 OVS_CB(skb)->acts_origlen = acts->orig_len;
1568 err = do_execute_actions(dp, skb, key,
1569 acts->actions, acts->actions_len);
1570
1571 if (level == 1)
1572 process_deferred_actions(dp);
1573
1574out:
1575 __this_cpu_dec(exec_actions_level);
1576 return err;
1577}
1578
1579int action_fifos_init(void)
1580{
1581 action_fifos = alloc_percpu(struct action_fifo);
1582 if (!action_fifos)
1583 return -ENOMEM;
1584
1585 flow_keys = alloc_percpu(struct action_flow_keys);
1586 if (!flow_keys) {
1587 free_percpu(action_fifos);
1588 return -ENOMEM;
1589 }
1590
1591 return 0;
1592}
1593
1594void action_fifos_exit(void)
1595{
1596 free_percpu(action_fifos);
1597 free_percpu(flow_keys);
1598}