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1 | /* | |
2 | * Copyright (c) 2007-2014 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/skbuff.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/ip.h> | |
24 | #include <linux/openvswitch.h> | |
25 | #include <linux/netfilter_ipv6.h> | |
26 | #include <linux/sctp.h> | |
27 | #include <linux/tcp.h> | |
28 | #include <linux/udp.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/if_vlan.h> | |
32 | ||
33 | #include <net/dst.h> | |
34 | #include <net/ip.h> | |
35 | #include <net/ipv6.h> | |
36 | #include <net/ip6_fib.h> | |
37 | #include <net/checksum.h> | |
38 | #include <net/dsfield.h> | |
39 | #include <net/mpls.h> | |
40 | #include <net/sctp/checksum.h> | |
41 | ||
42 | #include "datapath.h" | |
43 | #include "flow.h" | |
44 | #include "conntrack.h" | |
45 | #include "vport.h" | |
46 | ||
47 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
48 | struct sw_flow_key *key, | |
49 | const struct nlattr *attr, int len); | |
50 | ||
51 | struct deferred_action { | |
52 | struct sk_buff *skb; | |
53 | const struct nlattr *actions; | |
54 | ||
55 | /* Store pkt_key clone when creating deferred action. */ | |
56 | struct sw_flow_key pkt_key; | |
57 | }; | |
58 | ||
59 | #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN) | |
60 | struct ovs_frag_data { | |
61 | unsigned long dst; | |
62 | struct vport *vport; | |
63 | struct ovs_skb_cb cb; | |
64 | __be16 inner_protocol; | |
65 | __u16 vlan_tci; | |
66 | __be16 vlan_proto; | |
67 | unsigned int l2_len; | |
68 | u8 l2_data[MAX_L2_LEN]; | |
69 | }; | |
70 | ||
71 | static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage); | |
72 | ||
73 | #define DEFERRED_ACTION_FIFO_SIZE 10 | |
74 | struct action_fifo { | |
75 | int head; | |
76 | int tail; | |
77 | /* Deferred action fifo queue storage. */ | |
78 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; | |
79 | }; | |
80 | ||
81 | static struct action_fifo __percpu *action_fifos; | |
82 | static DEFINE_PER_CPU(int, exec_actions_level); | |
83 | ||
84 | static void action_fifo_init(struct action_fifo *fifo) | |
85 | { | |
86 | fifo->head = 0; | |
87 | fifo->tail = 0; | |
88 | } | |
89 | ||
90 | static bool action_fifo_is_empty(const struct action_fifo *fifo) | |
91 | { | |
92 | return (fifo->head == fifo->tail); | |
93 | } | |
94 | ||
95 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) | |
96 | { | |
97 | if (action_fifo_is_empty(fifo)) | |
98 | return NULL; | |
99 | ||
100 | return &fifo->fifo[fifo->tail++]; | |
101 | } | |
102 | ||
103 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) | |
104 | { | |
105 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) | |
106 | return NULL; | |
107 | ||
108 | return &fifo->fifo[fifo->head++]; | |
109 | } | |
110 | ||
111 | /* Return true if fifo is not full */ | |
112 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, | |
113 | const struct sw_flow_key *key, | |
114 | const struct nlattr *attr) | |
115 | { | |
116 | struct action_fifo *fifo; | |
117 | struct deferred_action *da; | |
118 | ||
119 | fifo = this_cpu_ptr(action_fifos); | |
120 | da = action_fifo_put(fifo); | |
121 | if (da) { | |
122 | da->skb = skb; | |
123 | da->actions = attr; | |
124 | da->pkt_key = *key; | |
125 | } | |
126 | ||
127 | return da; | |
128 | } | |
129 | ||
130 | static void invalidate_flow_key(struct sw_flow_key *key) | |
131 | { | |
132 | key->eth.type = htons(0); | |
133 | } | |
134 | ||
135 | static bool is_flow_key_valid(const struct sw_flow_key *key) | |
136 | { | |
137 | return !!key->eth.type; | |
138 | } | |
139 | ||
140 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, | |
141 | const struct ovs_action_push_mpls *mpls) | |
142 | { | |
143 | __be32 *new_mpls_lse; | |
144 | struct ethhdr *hdr; | |
145 | ||
146 | /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */ | |
147 | if (skb->encapsulation) | |
148 | return -ENOTSUPP; | |
149 | ||
150 | if (skb_cow_head(skb, MPLS_HLEN) < 0) | |
151 | return -ENOMEM; | |
152 | ||
153 | skb_push(skb, MPLS_HLEN); | |
154 | memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb), | |
155 | skb->mac_len); | |
156 | skb_reset_mac_header(skb); | |
157 | ||
158 | new_mpls_lse = (__be32 *)skb_mpls_header(skb); | |
159 | *new_mpls_lse = mpls->mpls_lse; | |
160 | ||
161 | skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN); | |
162 | ||
163 | hdr = eth_hdr(skb); | |
164 | hdr->h_proto = mpls->mpls_ethertype; | |
165 | ||
166 | if (!skb->inner_protocol) | |
167 | skb_set_inner_protocol(skb, skb->protocol); | |
168 | skb->protocol = mpls->mpls_ethertype; | |
169 | ||
170 | invalidate_flow_key(key); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, | |
175 | const __be16 ethertype) | |
176 | { | |
177 | struct ethhdr *hdr; | |
178 | int err; | |
179 | ||
180 | err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); | |
181 | if (unlikely(err)) | |
182 | return err; | |
183 | ||
184 | skb_postpull_rcsum(skb, skb_mpls_header(skb), MPLS_HLEN); | |
185 | ||
186 | memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), | |
187 | skb->mac_len); | |
188 | ||
189 | __skb_pull(skb, MPLS_HLEN); | |
190 | skb_reset_mac_header(skb); | |
191 | ||
192 | /* skb_mpls_header() is used to locate the ethertype | |
193 | * field correctly in the presence of VLAN tags. | |
194 | */ | |
195 | hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN); | |
196 | hdr->h_proto = ethertype; | |
197 | if (eth_p_mpls(skb->protocol)) | |
198 | skb->protocol = ethertype; | |
199 | ||
200 | invalidate_flow_key(key); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
205 | const __be32 *mpls_lse, const __be32 *mask) | |
206 | { | |
207 | __be32 *stack; | |
208 | __be32 lse; | |
209 | int err; | |
210 | ||
211 | err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); | |
212 | if (unlikely(err)) | |
213 | return err; | |
214 | ||
215 | stack = (__be32 *)skb_mpls_header(skb); | |
216 | lse = OVS_MASKED(*stack, *mpls_lse, *mask); | |
217 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
218 | __be32 diff[] = { ~(*stack), lse }; | |
219 | ||
220 | skb->csum = ~csum_partial((char *)diff, sizeof(diff), | |
221 | ~skb->csum); | |
222 | } | |
223 | ||
224 | *stack = lse; | |
225 | flow_key->mpls.top_lse = lse; | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) | |
230 | { | |
231 | int err; | |
232 | ||
233 | err = skb_vlan_pop(skb); | |
234 | if (skb_vlan_tag_present(skb)) | |
235 | invalidate_flow_key(key); | |
236 | else | |
237 | key->eth.tci = 0; | |
238 | return err; | |
239 | } | |
240 | ||
241 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, | |
242 | const struct ovs_action_push_vlan *vlan) | |
243 | { | |
244 | if (skb_vlan_tag_present(skb)) | |
245 | invalidate_flow_key(key); | |
246 | else | |
247 | key->eth.tci = vlan->vlan_tci; | |
248 | return skb_vlan_push(skb, vlan->vlan_tpid, | |
249 | ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); | |
250 | } | |
251 | ||
252 | /* 'src' is already properly masked. */ | |
253 | static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_) | |
254 | { | |
255 | u16 *dst = (u16 *)dst_; | |
256 | const u16 *src = (const u16 *)src_; | |
257 | const u16 *mask = (const u16 *)mask_; | |
258 | ||
259 | OVS_SET_MASKED(dst[0], src[0], mask[0]); | |
260 | OVS_SET_MASKED(dst[1], src[1], mask[1]); | |
261 | OVS_SET_MASKED(dst[2], src[2], mask[2]); | |
262 | } | |
263 | ||
264 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
265 | const struct ovs_key_ethernet *key, | |
266 | const struct ovs_key_ethernet *mask) | |
267 | { | |
268 | int err; | |
269 | ||
270 | err = skb_ensure_writable(skb, ETH_HLEN); | |
271 | if (unlikely(err)) | |
272 | return err; | |
273 | ||
274 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); | |
275 | ||
276 | ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src, | |
277 | mask->eth_src); | |
278 | ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst, | |
279 | mask->eth_dst); | |
280 | ||
281 | skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); | |
282 | ||
283 | ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source); | |
284 | ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest); | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh, | |
289 | __be32 addr, __be32 new_addr) | |
290 | { | |
291 | int transport_len = skb->len - skb_transport_offset(skb); | |
292 | ||
293 | if (nh->frag_off & htons(IP_OFFSET)) | |
294 | return; | |
295 | ||
296 | if (nh->protocol == IPPROTO_TCP) { | |
297 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
298 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, | |
299 | addr, new_addr, true); | |
300 | } else if (nh->protocol == IPPROTO_UDP) { | |
301 | if (likely(transport_len >= sizeof(struct udphdr))) { | |
302 | struct udphdr *uh = udp_hdr(skb); | |
303 | ||
304 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
305 | inet_proto_csum_replace4(&uh->check, skb, | |
306 | addr, new_addr, true); | |
307 | if (!uh->check) | |
308 | uh->check = CSUM_MANGLED_0; | |
309 | } | |
310 | } | |
311 | } | |
312 | } | |
313 | ||
314 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, | |
315 | __be32 *addr, __be32 new_addr) | |
316 | { | |
317 | update_ip_l4_checksum(skb, nh, *addr, new_addr); | |
318 | csum_replace4(&nh->check, *addr, new_addr); | |
319 | skb_clear_hash(skb); | |
320 | *addr = new_addr; | |
321 | } | |
322 | ||
323 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, | |
324 | __be32 addr[4], const __be32 new_addr[4]) | |
325 | { | |
326 | int transport_len = skb->len - skb_transport_offset(skb); | |
327 | ||
328 | if (l4_proto == NEXTHDR_TCP) { | |
329 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
330 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
331 | addr, new_addr, true); | |
332 | } else if (l4_proto == NEXTHDR_UDP) { | |
333 | if (likely(transport_len >= sizeof(struct udphdr))) { | |
334 | struct udphdr *uh = udp_hdr(skb); | |
335 | ||
336 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
337 | inet_proto_csum_replace16(&uh->check, skb, | |
338 | addr, new_addr, true); | |
339 | if (!uh->check) | |
340 | uh->check = CSUM_MANGLED_0; | |
341 | } | |
342 | } | |
343 | } else if (l4_proto == NEXTHDR_ICMP) { | |
344 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
345 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
346 | skb, addr, new_addr, true); | |
347 | } | |
348 | } | |
349 | ||
350 | static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4], | |
351 | const __be32 mask[4], __be32 masked[4]) | |
352 | { | |
353 | masked[0] = OVS_MASKED(old[0], addr[0], mask[0]); | |
354 | masked[1] = OVS_MASKED(old[1], addr[1], mask[1]); | |
355 | masked[2] = OVS_MASKED(old[2], addr[2], mask[2]); | |
356 | masked[3] = OVS_MASKED(old[3], addr[3], mask[3]); | |
357 | } | |
358 | ||
359 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, | |
360 | __be32 addr[4], const __be32 new_addr[4], | |
361 | bool recalculate_csum) | |
362 | { | |
363 | if (recalculate_csum) | |
364 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); | |
365 | ||
366 | skb_clear_hash(skb); | |
367 | memcpy(addr, new_addr, sizeof(__be32[4])); | |
368 | } | |
369 | ||
370 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask) | |
371 | { | |
372 | /* Bits 21-24 are always unmasked, so this retains their values. */ | |
373 | OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16)); | |
374 | OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8)); | |
375 | OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask); | |
376 | } | |
377 | ||
378 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl, | |
379 | u8 mask) | |
380 | { | |
381 | new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask); | |
382 | ||
383 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); | |
384 | nh->ttl = new_ttl; | |
385 | } | |
386 | ||
387 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
388 | const struct ovs_key_ipv4 *key, | |
389 | const struct ovs_key_ipv4 *mask) | |
390 | { | |
391 | struct iphdr *nh; | |
392 | __be32 new_addr; | |
393 | int err; | |
394 | ||
395 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
396 | sizeof(struct iphdr)); | |
397 | if (unlikely(err)) | |
398 | return err; | |
399 | ||
400 | nh = ip_hdr(skb); | |
401 | ||
402 | /* Setting an IP addresses is typically only a side effect of | |
403 | * matching on them in the current userspace implementation, so it | |
404 | * makes sense to check if the value actually changed. | |
405 | */ | |
406 | if (mask->ipv4_src) { | |
407 | new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src); | |
408 | ||
409 | if (unlikely(new_addr != nh->saddr)) { | |
410 | set_ip_addr(skb, nh, &nh->saddr, new_addr); | |
411 | flow_key->ipv4.addr.src = new_addr; | |
412 | } | |
413 | } | |
414 | if (mask->ipv4_dst) { | |
415 | new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst); | |
416 | ||
417 | if (unlikely(new_addr != nh->daddr)) { | |
418 | set_ip_addr(skb, nh, &nh->daddr, new_addr); | |
419 | flow_key->ipv4.addr.dst = new_addr; | |
420 | } | |
421 | } | |
422 | if (mask->ipv4_tos) { | |
423 | ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos); | |
424 | flow_key->ip.tos = nh->tos; | |
425 | } | |
426 | if (mask->ipv4_ttl) { | |
427 | set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl); | |
428 | flow_key->ip.ttl = nh->ttl; | |
429 | } | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | static bool is_ipv6_mask_nonzero(const __be32 addr[4]) | |
435 | { | |
436 | return !!(addr[0] | addr[1] | addr[2] | addr[3]); | |
437 | } | |
438 | ||
439 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
440 | const struct ovs_key_ipv6 *key, | |
441 | const struct ovs_key_ipv6 *mask) | |
442 | { | |
443 | struct ipv6hdr *nh; | |
444 | int err; | |
445 | ||
446 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
447 | sizeof(struct ipv6hdr)); | |
448 | if (unlikely(err)) | |
449 | return err; | |
450 | ||
451 | nh = ipv6_hdr(skb); | |
452 | ||
453 | /* Setting an IP addresses is typically only a side effect of | |
454 | * matching on them in the current userspace implementation, so it | |
455 | * makes sense to check if the value actually changed. | |
456 | */ | |
457 | if (is_ipv6_mask_nonzero(mask->ipv6_src)) { | |
458 | __be32 *saddr = (__be32 *)&nh->saddr; | |
459 | __be32 masked[4]; | |
460 | ||
461 | mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked); | |
462 | ||
463 | if (unlikely(memcmp(saddr, masked, sizeof(masked)))) { | |
464 | set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked, | |
465 | true); | |
466 | memcpy(&flow_key->ipv6.addr.src, masked, | |
467 | sizeof(flow_key->ipv6.addr.src)); | |
468 | } | |
469 | } | |
470 | if (is_ipv6_mask_nonzero(mask->ipv6_dst)) { | |
471 | unsigned int offset = 0; | |
472 | int flags = IP6_FH_F_SKIP_RH; | |
473 | bool recalc_csum = true; | |
474 | __be32 *daddr = (__be32 *)&nh->daddr; | |
475 | __be32 masked[4]; | |
476 | ||
477 | mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked); | |
478 | ||
479 | if (unlikely(memcmp(daddr, masked, sizeof(masked)))) { | |
480 | if (ipv6_ext_hdr(nh->nexthdr)) | |
481 | recalc_csum = (ipv6_find_hdr(skb, &offset, | |
482 | NEXTHDR_ROUTING, | |
483 | NULL, &flags) | |
484 | != NEXTHDR_ROUTING); | |
485 | ||
486 | set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked, | |
487 | recalc_csum); | |
488 | memcpy(&flow_key->ipv6.addr.dst, masked, | |
489 | sizeof(flow_key->ipv6.addr.dst)); | |
490 | } | |
491 | } | |
492 | if (mask->ipv6_tclass) { | |
493 | ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass); | |
494 | flow_key->ip.tos = ipv6_get_dsfield(nh); | |
495 | } | |
496 | if (mask->ipv6_label) { | |
497 | set_ipv6_fl(nh, ntohl(key->ipv6_label), | |
498 | ntohl(mask->ipv6_label)); | |
499 | flow_key->ipv6.label = | |
500 | *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
501 | } | |
502 | if (mask->ipv6_hlimit) { | |
503 | OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit, | |
504 | mask->ipv6_hlimit); | |
505 | flow_key->ip.ttl = nh->hop_limit; | |
506 | } | |
507 | return 0; | |
508 | } | |
509 | ||
510 | /* Must follow skb_ensure_writable() since that can move the skb data. */ | |
511 | static void set_tp_port(struct sk_buff *skb, __be16 *port, | |
512 | __be16 new_port, __sum16 *check) | |
513 | { | |
514 | inet_proto_csum_replace2(check, skb, *port, new_port, false); | |
515 | *port = new_port; | |
516 | } | |
517 | ||
518 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
519 | const struct ovs_key_udp *key, | |
520 | const struct ovs_key_udp *mask) | |
521 | { | |
522 | struct udphdr *uh; | |
523 | __be16 src, dst; | |
524 | int err; | |
525 | ||
526 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + | |
527 | sizeof(struct udphdr)); | |
528 | if (unlikely(err)) | |
529 | return err; | |
530 | ||
531 | uh = udp_hdr(skb); | |
532 | /* Either of the masks is non-zero, so do not bother checking them. */ | |
533 | src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src); | |
534 | dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst); | |
535 | ||
536 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { | |
537 | if (likely(src != uh->source)) { | |
538 | set_tp_port(skb, &uh->source, src, &uh->check); | |
539 | flow_key->tp.src = src; | |
540 | } | |
541 | if (likely(dst != uh->dest)) { | |
542 | set_tp_port(skb, &uh->dest, dst, &uh->check); | |
543 | flow_key->tp.dst = dst; | |
544 | } | |
545 | ||
546 | if (unlikely(!uh->check)) | |
547 | uh->check = CSUM_MANGLED_0; | |
548 | } else { | |
549 | uh->source = src; | |
550 | uh->dest = dst; | |
551 | flow_key->tp.src = src; | |
552 | flow_key->tp.dst = dst; | |
553 | } | |
554 | ||
555 | skb_clear_hash(skb); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
561 | const struct ovs_key_tcp *key, | |
562 | const struct ovs_key_tcp *mask) | |
563 | { | |
564 | struct tcphdr *th; | |
565 | __be16 src, dst; | |
566 | int err; | |
567 | ||
568 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + | |
569 | sizeof(struct tcphdr)); | |
570 | if (unlikely(err)) | |
571 | return err; | |
572 | ||
573 | th = tcp_hdr(skb); | |
574 | src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src); | |
575 | if (likely(src != th->source)) { | |
576 | set_tp_port(skb, &th->source, src, &th->check); | |
577 | flow_key->tp.src = src; | |
578 | } | |
579 | dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst); | |
580 | if (likely(dst != th->dest)) { | |
581 | set_tp_port(skb, &th->dest, dst, &th->check); | |
582 | flow_key->tp.dst = dst; | |
583 | } | |
584 | skb_clear_hash(skb); | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
589 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
590 | const struct ovs_key_sctp *key, | |
591 | const struct ovs_key_sctp *mask) | |
592 | { | |
593 | unsigned int sctphoff = skb_transport_offset(skb); | |
594 | struct sctphdr *sh; | |
595 | __le32 old_correct_csum, new_csum, old_csum; | |
596 | int err; | |
597 | ||
598 | err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr)); | |
599 | if (unlikely(err)) | |
600 | return err; | |
601 | ||
602 | sh = sctp_hdr(skb); | |
603 | old_csum = sh->checksum; | |
604 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
605 | ||
606 | sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src); | |
607 | sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst); | |
608 | ||
609 | new_csum = sctp_compute_cksum(skb, sctphoff); | |
610 | ||
611 | /* Carry any checksum errors through. */ | |
612 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
613 | ||
614 | skb_clear_hash(skb); | |
615 | flow_key->tp.src = sh->source; | |
616 | flow_key->tp.dst = sh->dest; | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *skb) | |
622 | { | |
623 | struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage); | |
624 | struct vport *vport = data->vport; | |
625 | ||
626 | if (skb_cow_head(skb, data->l2_len) < 0) { | |
627 | kfree_skb(skb); | |
628 | return -ENOMEM; | |
629 | } | |
630 | ||
631 | __skb_dst_copy(skb, data->dst); | |
632 | *OVS_CB(skb) = data->cb; | |
633 | skb->inner_protocol = data->inner_protocol; | |
634 | skb->vlan_tci = data->vlan_tci; | |
635 | skb->vlan_proto = data->vlan_proto; | |
636 | ||
637 | /* Reconstruct the MAC header. */ | |
638 | skb_push(skb, data->l2_len); | |
639 | memcpy(skb->data, &data->l2_data, data->l2_len); | |
640 | skb_postpush_rcsum(skb, skb->data, data->l2_len); | |
641 | skb_reset_mac_header(skb); | |
642 | ||
643 | ovs_vport_send(vport, skb); | |
644 | return 0; | |
645 | } | |
646 | ||
647 | static unsigned int | |
648 | ovs_dst_get_mtu(const struct dst_entry *dst) | |
649 | { | |
650 | return dst->dev->mtu; | |
651 | } | |
652 | ||
653 | static struct dst_ops ovs_dst_ops = { | |
654 | .family = AF_UNSPEC, | |
655 | .mtu = ovs_dst_get_mtu, | |
656 | }; | |
657 | ||
658 | /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is | |
659 | * ovs_vport_output(), which is called once per fragmented packet. | |
660 | */ | |
661 | static void prepare_frag(struct vport *vport, struct sk_buff *skb) | |
662 | { | |
663 | unsigned int hlen = skb_network_offset(skb); | |
664 | struct ovs_frag_data *data; | |
665 | ||
666 | data = this_cpu_ptr(&ovs_frag_data_storage); | |
667 | data->dst = skb->_skb_refdst; | |
668 | data->vport = vport; | |
669 | data->cb = *OVS_CB(skb); | |
670 | data->inner_protocol = skb->inner_protocol; | |
671 | data->vlan_tci = skb->vlan_tci; | |
672 | data->vlan_proto = skb->vlan_proto; | |
673 | data->l2_len = hlen; | |
674 | memcpy(&data->l2_data, skb->data, hlen); | |
675 | ||
676 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
677 | skb_pull(skb, hlen); | |
678 | } | |
679 | ||
680 | static void ovs_fragment(struct net *net, struct vport *vport, | |
681 | struct sk_buff *skb, u16 mru, __be16 ethertype) | |
682 | { | |
683 | if (skb_network_offset(skb) > MAX_L2_LEN) { | |
684 | OVS_NLERR(1, "L2 header too long to fragment"); | |
685 | goto err; | |
686 | } | |
687 | ||
688 | if (ethertype == htons(ETH_P_IP)) { | |
689 | struct dst_entry ovs_dst; | |
690 | unsigned long orig_dst; | |
691 | ||
692 | prepare_frag(vport, skb); | |
693 | dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1, | |
694 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
695 | ovs_dst.dev = vport->dev; | |
696 | ||
697 | orig_dst = skb->_skb_refdst; | |
698 | skb_dst_set_noref(skb, &ovs_dst); | |
699 | IPCB(skb)->frag_max_size = mru; | |
700 | ||
701 | ip_do_fragment(net, skb->sk, skb, ovs_vport_output); | |
702 | refdst_drop(orig_dst); | |
703 | } else if (ethertype == htons(ETH_P_IPV6)) { | |
704 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); | |
705 | unsigned long orig_dst; | |
706 | struct rt6_info ovs_rt; | |
707 | ||
708 | if (!v6ops) { | |
709 | goto err; | |
710 | } | |
711 | ||
712 | prepare_frag(vport, skb); | |
713 | memset(&ovs_rt, 0, sizeof(ovs_rt)); | |
714 | dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1, | |
715 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
716 | ovs_rt.dst.dev = vport->dev; | |
717 | ||
718 | orig_dst = skb->_skb_refdst; | |
719 | skb_dst_set_noref(skb, &ovs_rt.dst); | |
720 | IP6CB(skb)->frag_max_size = mru; | |
721 | ||
722 | v6ops->fragment(net, skb->sk, skb, ovs_vport_output); | |
723 | refdst_drop(orig_dst); | |
724 | } else { | |
725 | WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.", | |
726 | ovs_vport_name(vport), ntohs(ethertype), mru, | |
727 | vport->dev->mtu); | |
728 | goto err; | |
729 | } | |
730 | ||
731 | return; | |
732 | err: | |
733 | kfree_skb(skb); | |
734 | } | |
735 | ||
736 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port, | |
737 | struct sw_flow_key *key) | |
738 | { | |
739 | struct vport *vport = ovs_vport_rcu(dp, out_port); | |
740 | ||
741 | if (likely(vport)) { | |
742 | u16 mru = OVS_CB(skb)->mru; | |
743 | ||
744 | if (likely(!mru || (skb->len <= mru + ETH_HLEN))) { | |
745 | ovs_vport_send(vport, skb); | |
746 | } else if (mru <= vport->dev->mtu) { | |
747 | struct net *net = read_pnet(&dp->net); | |
748 | __be16 ethertype = key->eth.type; | |
749 | ||
750 | if (!is_flow_key_valid(key)) { | |
751 | if (eth_p_mpls(skb->protocol)) | |
752 | ethertype = skb->inner_protocol; | |
753 | else | |
754 | ethertype = vlan_get_protocol(skb); | |
755 | } | |
756 | ||
757 | ovs_fragment(net, vport, skb, mru, ethertype); | |
758 | } else { | |
759 | kfree_skb(skb); | |
760 | } | |
761 | } else { | |
762 | kfree_skb(skb); | |
763 | } | |
764 | } | |
765 | ||
766 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, | |
767 | struct sw_flow_key *key, const struct nlattr *attr, | |
768 | const struct nlattr *actions, int actions_len) | |
769 | { | |
770 | struct dp_upcall_info upcall; | |
771 | const struct nlattr *a; | |
772 | int rem; | |
773 | ||
774 | memset(&upcall, 0, sizeof(upcall)); | |
775 | upcall.cmd = OVS_PACKET_CMD_ACTION; | |
776 | upcall.mru = OVS_CB(skb)->mru; | |
777 | ||
778 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
779 | a = nla_next(a, &rem)) { | |
780 | switch (nla_type(a)) { | |
781 | case OVS_USERSPACE_ATTR_USERDATA: | |
782 | upcall.userdata = a; | |
783 | break; | |
784 | ||
785 | case OVS_USERSPACE_ATTR_PID: | |
786 | upcall.portid = nla_get_u32(a); | |
787 | break; | |
788 | ||
789 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
790 | /* Get out tunnel info. */ | |
791 | struct vport *vport; | |
792 | ||
793 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
794 | if (vport) { | |
795 | int err; | |
796 | ||
797 | err = dev_fill_metadata_dst(vport->dev, skb); | |
798 | if (!err) | |
799 | upcall.egress_tun_info = skb_tunnel_info(skb); | |
800 | } | |
801 | ||
802 | break; | |
803 | } | |
804 | ||
805 | case OVS_USERSPACE_ATTR_ACTIONS: { | |
806 | /* Include actions. */ | |
807 | upcall.actions = actions; | |
808 | upcall.actions_len = actions_len; | |
809 | break; | |
810 | } | |
811 | ||
812 | } /* End of switch. */ | |
813 | } | |
814 | ||
815 | return ovs_dp_upcall(dp, skb, key, &upcall); | |
816 | } | |
817 | ||
818 | static int sample(struct datapath *dp, struct sk_buff *skb, | |
819 | struct sw_flow_key *key, const struct nlattr *attr, | |
820 | const struct nlattr *actions, int actions_len) | |
821 | { | |
822 | const struct nlattr *acts_list = NULL; | |
823 | const struct nlattr *a; | |
824 | int rem; | |
825 | ||
826 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
827 | a = nla_next(a, &rem)) { | |
828 | u32 probability; | |
829 | ||
830 | switch (nla_type(a)) { | |
831 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
832 | probability = nla_get_u32(a); | |
833 | if (!probability || prandom_u32() > probability) | |
834 | return 0; | |
835 | break; | |
836 | ||
837 | case OVS_SAMPLE_ATTR_ACTIONS: | |
838 | acts_list = a; | |
839 | break; | |
840 | } | |
841 | } | |
842 | ||
843 | rem = nla_len(acts_list); | |
844 | a = nla_data(acts_list); | |
845 | ||
846 | /* Actions list is empty, do nothing */ | |
847 | if (unlikely(!rem)) | |
848 | return 0; | |
849 | ||
850 | /* The only known usage of sample action is having a single user-space | |
851 | * action. Treat this usage as a special case. | |
852 | * The output_userspace() should clone the skb to be sent to the | |
853 | * user space. This skb will be consumed by its caller. | |
854 | */ | |
855 | if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE && | |
856 | nla_is_last(a, rem))) | |
857 | return output_userspace(dp, skb, key, a, actions, actions_len); | |
858 | ||
859 | skb = skb_clone(skb, GFP_ATOMIC); | |
860 | if (!skb) | |
861 | /* Skip the sample action when out of memory. */ | |
862 | return 0; | |
863 | ||
864 | if (!add_deferred_actions(skb, key, a)) { | |
865 | if (net_ratelimit()) | |
866 | pr_warn("%s: deferred actions limit reached, dropping sample action\n", | |
867 | ovs_dp_name(dp)); | |
868 | ||
869 | kfree_skb(skb); | |
870 | } | |
871 | return 0; | |
872 | } | |
873 | ||
874 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, | |
875 | const struct nlattr *attr) | |
876 | { | |
877 | struct ovs_action_hash *hash_act = nla_data(attr); | |
878 | u32 hash = 0; | |
879 | ||
880 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
881 | hash = skb_get_hash(skb); | |
882 | hash = jhash_1word(hash, hash_act->hash_basis); | |
883 | if (!hash) | |
884 | hash = 0x1; | |
885 | ||
886 | key->ovs_flow_hash = hash; | |
887 | } | |
888 | ||
889 | static int execute_set_action(struct sk_buff *skb, | |
890 | struct sw_flow_key *flow_key, | |
891 | const struct nlattr *a) | |
892 | { | |
893 | /* Only tunnel set execution is supported without a mask. */ | |
894 | if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) { | |
895 | struct ovs_tunnel_info *tun = nla_data(a); | |
896 | ||
897 | skb_dst_drop(skb); | |
898 | dst_hold((struct dst_entry *)tun->tun_dst); | |
899 | skb_dst_set(skb, (struct dst_entry *)tun->tun_dst); | |
900 | return 0; | |
901 | } | |
902 | ||
903 | return -EINVAL; | |
904 | } | |
905 | ||
906 | /* Mask is at the midpoint of the data. */ | |
907 | #define get_mask(a, type) ((const type)nla_data(a) + 1) | |
908 | ||
909 | static int execute_masked_set_action(struct sk_buff *skb, | |
910 | struct sw_flow_key *flow_key, | |
911 | const struct nlattr *a) | |
912 | { | |
913 | int err = 0; | |
914 | ||
915 | switch (nla_type(a)) { | |
916 | case OVS_KEY_ATTR_PRIORITY: | |
917 | OVS_SET_MASKED(skb->priority, nla_get_u32(a), | |
918 | *get_mask(a, u32 *)); | |
919 | flow_key->phy.priority = skb->priority; | |
920 | break; | |
921 | ||
922 | case OVS_KEY_ATTR_SKB_MARK: | |
923 | OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *)); | |
924 | flow_key->phy.skb_mark = skb->mark; | |
925 | break; | |
926 | ||
927 | case OVS_KEY_ATTR_TUNNEL_INFO: | |
928 | /* Masked data not supported for tunnel. */ | |
929 | err = -EINVAL; | |
930 | break; | |
931 | ||
932 | case OVS_KEY_ATTR_ETHERNET: | |
933 | err = set_eth_addr(skb, flow_key, nla_data(a), | |
934 | get_mask(a, struct ovs_key_ethernet *)); | |
935 | break; | |
936 | ||
937 | case OVS_KEY_ATTR_IPV4: | |
938 | err = set_ipv4(skb, flow_key, nla_data(a), | |
939 | get_mask(a, struct ovs_key_ipv4 *)); | |
940 | break; | |
941 | ||
942 | case OVS_KEY_ATTR_IPV6: | |
943 | err = set_ipv6(skb, flow_key, nla_data(a), | |
944 | get_mask(a, struct ovs_key_ipv6 *)); | |
945 | break; | |
946 | ||
947 | case OVS_KEY_ATTR_TCP: | |
948 | err = set_tcp(skb, flow_key, nla_data(a), | |
949 | get_mask(a, struct ovs_key_tcp *)); | |
950 | break; | |
951 | ||
952 | case OVS_KEY_ATTR_UDP: | |
953 | err = set_udp(skb, flow_key, nla_data(a), | |
954 | get_mask(a, struct ovs_key_udp *)); | |
955 | break; | |
956 | ||
957 | case OVS_KEY_ATTR_SCTP: | |
958 | err = set_sctp(skb, flow_key, nla_data(a), | |
959 | get_mask(a, struct ovs_key_sctp *)); | |
960 | break; | |
961 | ||
962 | case OVS_KEY_ATTR_MPLS: | |
963 | err = set_mpls(skb, flow_key, nla_data(a), get_mask(a, | |
964 | __be32 *)); | |
965 | break; | |
966 | ||
967 | case OVS_KEY_ATTR_CT_STATE: | |
968 | case OVS_KEY_ATTR_CT_ZONE: | |
969 | case OVS_KEY_ATTR_CT_MARK: | |
970 | case OVS_KEY_ATTR_CT_LABELS: | |
971 | err = -EINVAL; | |
972 | break; | |
973 | } | |
974 | ||
975 | return err; | |
976 | } | |
977 | ||
978 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, | |
979 | struct sw_flow_key *key, | |
980 | const struct nlattr *a, int rem) | |
981 | { | |
982 | struct deferred_action *da; | |
983 | ||
984 | if (!is_flow_key_valid(key)) { | |
985 | int err; | |
986 | ||
987 | err = ovs_flow_key_update(skb, key); | |
988 | if (err) | |
989 | return err; | |
990 | } | |
991 | BUG_ON(!is_flow_key_valid(key)); | |
992 | ||
993 | if (!nla_is_last(a, rem)) { | |
994 | /* Recirc action is the not the last action | |
995 | * of the action list, need to clone the skb. | |
996 | */ | |
997 | skb = skb_clone(skb, GFP_ATOMIC); | |
998 | ||
999 | /* Skip the recirc action when out of memory, but | |
1000 | * continue on with the rest of the action list. | |
1001 | */ | |
1002 | if (!skb) | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | da = add_deferred_actions(skb, key, NULL); | |
1007 | if (da) { | |
1008 | da->pkt_key.recirc_id = nla_get_u32(a); | |
1009 | } else { | |
1010 | kfree_skb(skb); | |
1011 | ||
1012 | if (net_ratelimit()) | |
1013 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
1014 | ovs_dp_name(dp)); | |
1015 | } | |
1016 | ||
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | /* Execute a list of actions against 'skb'. */ | |
1021 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
1022 | struct sw_flow_key *key, | |
1023 | const struct nlattr *attr, int len) | |
1024 | { | |
1025 | /* Every output action needs a separate clone of 'skb', but the common | |
1026 | * case is just a single output action, so that doing a clone and | |
1027 | * then freeing the original skbuff is wasteful. So the following code | |
1028 | * is slightly obscure just to avoid that. | |
1029 | */ | |
1030 | int prev_port = -1; | |
1031 | const struct nlattr *a; | |
1032 | int rem; | |
1033 | ||
1034 | for (a = attr, rem = len; rem > 0; | |
1035 | a = nla_next(a, &rem)) { | |
1036 | int err = 0; | |
1037 | ||
1038 | if (unlikely(prev_port != -1)) { | |
1039 | struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC); | |
1040 | ||
1041 | if (out_skb) | |
1042 | do_output(dp, out_skb, prev_port, key); | |
1043 | ||
1044 | prev_port = -1; | |
1045 | } | |
1046 | ||
1047 | switch (nla_type(a)) { | |
1048 | case OVS_ACTION_ATTR_OUTPUT: | |
1049 | prev_port = nla_get_u32(a); | |
1050 | break; | |
1051 | ||
1052 | case OVS_ACTION_ATTR_USERSPACE: | |
1053 | output_userspace(dp, skb, key, a, attr, len); | |
1054 | break; | |
1055 | ||
1056 | case OVS_ACTION_ATTR_HASH: | |
1057 | execute_hash(skb, key, a); | |
1058 | break; | |
1059 | ||
1060 | case OVS_ACTION_ATTR_PUSH_MPLS: | |
1061 | err = push_mpls(skb, key, nla_data(a)); | |
1062 | break; | |
1063 | ||
1064 | case OVS_ACTION_ATTR_POP_MPLS: | |
1065 | err = pop_mpls(skb, key, nla_get_be16(a)); | |
1066 | break; | |
1067 | ||
1068 | case OVS_ACTION_ATTR_PUSH_VLAN: | |
1069 | err = push_vlan(skb, key, nla_data(a)); | |
1070 | break; | |
1071 | ||
1072 | case OVS_ACTION_ATTR_POP_VLAN: | |
1073 | err = pop_vlan(skb, key); | |
1074 | break; | |
1075 | ||
1076 | case OVS_ACTION_ATTR_RECIRC: | |
1077 | err = execute_recirc(dp, skb, key, a, rem); | |
1078 | if (nla_is_last(a, rem)) { | |
1079 | /* If this is the last action, the skb has | |
1080 | * been consumed or freed. | |
1081 | * Return immediately. | |
1082 | */ | |
1083 | return err; | |
1084 | } | |
1085 | break; | |
1086 | ||
1087 | case OVS_ACTION_ATTR_SET: | |
1088 | err = execute_set_action(skb, key, nla_data(a)); | |
1089 | break; | |
1090 | ||
1091 | case OVS_ACTION_ATTR_SET_MASKED: | |
1092 | case OVS_ACTION_ATTR_SET_TO_MASKED: | |
1093 | err = execute_masked_set_action(skb, key, nla_data(a)); | |
1094 | break; | |
1095 | ||
1096 | case OVS_ACTION_ATTR_SAMPLE: | |
1097 | err = sample(dp, skb, key, a, attr, len); | |
1098 | break; | |
1099 | ||
1100 | case OVS_ACTION_ATTR_CT: | |
1101 | if (!is_flow_key_valid(key)) { | |
1102 | err = ovs_flow_key_update(skb, key); | |
1103 | if (err) | |
1104 | return err; | |
1105 | } | |
1106 | ||
1107 | err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key, | |
1108 | nla_data(a)); | |
1109 | ||
1110 | /* Hide stolen IP fragments from user space. */ | |
1111 | if (err) | |
1112 | return err == -EINPROGRESS ? 0 : err; | |
1113 | break; | |
1114 | } | |
1115 | ||
1116 | if (unlikely(err)) { | |
1117 | kfree_skb(skb); | |
1118 | return err; | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | if (prev_port != -1) | |
1123 | do_output(dp, skb, prev_port, key); | |
1124 | else | |
1125 | consume_skb(skb); | |
1126 | ||
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | static void process_deferred_actions(struct datapath *dp) | |
1131 | { | |
1132 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
1133 | ||
1134 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
1135 | if (action_fifo_is_empty(fifo)) | |
1136 | return; | |
1137 | ||
1138 | /* Finishing executing all deferred actions. */ | |
1139 | do { | |
1140 | struct deferred_action *da = action_fifo_get(fifo); | |
1141 | struct sk_buff *skb = da->skb; | |
1142 | struct sw_flow_key *key = &da->pkt_key; | |
1143 | const struct nlattr *actions = da->actions; | |
1144 | ||
1145 | if (actions) | |
1146 | do_execute_actions(dp, skb, key, actions, | |
1147 | nla_len(actions)); | |
1148 | else | |
1149 | ovs_dp_process_packet(skb, key); | |
1150 | } while (!action_fifo_is_empty(fifo)); | |
1151 | ||
1152 | /* Reset FIFO for the next packet. */ | |
1153 | action_fifo_init(fifo); | |
1154 | } | |
1155 | ||
1156 | /* Execute a list of actions against 'skb'. */ | |
1157 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
1158 | const struct sw_flow_actions *acts, | |
1159 | struct sw_flow_key *key) | |
1160 | { | |
1161 | static const int ovs_recursion_limit = 5; | |
1162 | int err, level; | |
1163 | ||
1164 | level = __this_cpu_inc_return(exec_actions_level); | |
1165 | if (unlikely(level > ovs_recursion_limit)) { | |
1166 | net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n", | |
1167 | ovs_dp_name(dp)); | |
1168 | kfree_skb(skb); | |
1169 | err = -ENETDOWN; | |
1170 | goto out; | |
1171 | } | |
1172 | ||
1173 | err = do_execute_actions(dp, skb, key, | |
1174 | acts->actions, acts->actions_len); | |
1175 | ||
1176 | if (level == 1) | |
1177 | process_deferred_actions(dp); | |
1178 | ||
1179 | out: | |
1180 | __this_cpu_dec(exec_actions_level); | |
1181 | return err; | |
1182 | } | |
1183 | ||
1184 | int action_fifos_init(void) | |
1185 | { | |
1186 | action_fifos = alloc_percpu(struct action_fifo); | |
1187 | if (!action_fifos) | |
1188 | return -ENOMEM; | |
1189 | ||
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | void action_fifos_exit(void) | |
1194 | { | |
1195 | free_percpu(action_fifos); | |
1196 | } |