Commit | Line | Data |
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ccb1352e | 1 | /* |
971427f3 | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
ccb1352e JG |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/skbuff.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/ip.h> | |
24 | #include <linux/openvswitch.h> | |
a175a723 | 25 | #include <linux/sctp.h> |
ccb1352e JG |
26 | #include <linux/tcp.h> |
27 | #include <linux/udp.h> | |
28 | #include <linux/in6.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/if_vlan.h> | |
31 | #include <net/ip.h> | |
3fdbd1ce | 32 | #include <net/ipv6.h> |
ccb1352e JG |
33 | #include <net/checksum.h> |
34 | #include <net/dsfield.h> | |
a175a723 | 35 | #include <net/sctp/checksum.h> |
ccb1352e JG |
36 | |
37 | #include "datapath.h" | |
971427f3 | 38 | #include "flow.h" |
ccb1352e JG |
39 | #include "vport.h" |
40 | ||
41 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 42 | struct sw_flow_key *key, |
651887b0 | 43 | const struct nlattr *attr, int len); |
ccb1352e | 44 | |
971427f3 AZ |
45 | struct deferred_action { |
46 | struct sk_buff *skb; | |
47 | const struct nlattr *actions; | |
48 | ||
49 | /* Store pkt_key clone when creating deferred action. */ | |
50 | struct sw_flow_key pkt_key; | |
51 | }; | |
52 | ||
53 | #define DEFERRED_ACTION_FIFO_SIZE 10 | |
54 | struct action_fifo { | |
55 | int head; | |
56 | int tail; | |
57 | /* Deferred action fifo queue storage. */ | |
58 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; | |
59 | }; | |
60 | ||
61 | static struct action_fifo __percpu *action_fifos; | |
62 | static DEFINE_PER_CPU(int, exec_actions_level); | |
63 | ||
64 | static void action_fifo_init(struct action_fifo *fifo) | |
65 | { | |
66 | fifo->head = 0; | |
67 | fifo->tail = 0; | |
68 | } | |
69 | ||
70 | static bool action_fifo_is_empty(struct action_fifo *fifo) | |
71 | { | |
72 | return (fifo->head == fifo->tail); | |
73 | } | |
74 | ||
75 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) | |
76 | { | |
77 | if (action_fifo_is_empty(fifo)) | |
78 | return NULL; | |
79 | ||
80 | return &fifo->fifo[fifo->tail++]; | |
81 | } | |
82 | ||
83 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) | |
84 | { | |
85 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) | |
86 | return NULL; | |
87 | ||
88 | return &fifo->fifo[fifo->head++]; | |
89 | } | |
90 | ||
91 | /* Return true if fifo is not full */ | |
92 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, | |
93 | struct sw_flow_key *key, | |
94 | const struct nlattr *attr) | |
95 | { | |
96 | struct action_fifo *fifo; | |
97 | struct deferred_action *da; | |
98 | ||
99 | fifo = this_cpu_ptr(action_fifos); | |
100 | da = action_fifo_put(fifo); | |
101 | if (da) { | |
102 | da->skb = skb; | |
103 | da->actions = attr; | |
104 | da->pkt_key = *key; | |
105 | } | |
106 | ||
107 | return da; | |
108 | } | |
109 | ||
ccb1352e JG |
110 | static int make_writable(struct sk_buff *skb, int write_len) |
111 | { | |
2ba5af42 JB |
112 | if (!pskb_may_pull(skb, write_len)) |
113 | return -ENOMEM; | |
114 | ||
ccb1352e JG |
115 | if (!skb_cloned(skb) || skb_clone_writable(skb, write_len)) |
116 | return 0; | |
117 | ||
118 | return pskb_expand_head(skb, 0, 0, GFP_ATOMIC); | |
119 | } | |
120 | ||
39855b5b | 121 | /* remove VLAN header from packet and update csum accordingly. */ |
ccb1352e JG |
122 | static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci) |
123 | { | |
124 | struct vlan_hdr *vhdr; | |
125 | int err; | |
126 | ||
127 | err = make_writable(skb, VLAN_ETH_HLEN); | |
128 | if (unlikely(err)) | |
129 | return err; | |
130 | ||
131 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
132 | skb->csum = csum_sub(skb->csum, csum_partial(skb->data | |
7b024082 | 133 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
ccb1352e JG |
134 | |
135 | vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN); | |
136 | *current_tci = vhdr->h_vlan_TCI; | |
137 | ||
138 | memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); | |
139 | __skb_pull(skb, VLAN_HLEN); | |
140 | ||
141 | vlan_set_encap_proto(skb, vhdr); | |
142 | skb->mac_header += VLAN_HLEN; | |
2ba5af42 JB |
143 | if (skb_network_offset(skb) < ETH_HLEN) |
144 | skb_set_network_header(skb, ETH_HLEN); | |
ccb1352e JG |
145 | skb_reset_mac_len(skb); |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | static int pop_vlan(struct sk_buff *skb) | |
151 | { | |
152 | __be16 tci; | |
153 | int err; | |
154 | ||
155 | if (likely(vlan_tx_tag_present(skb))) { | |
156 | skb->vlan_tci = 0; | |
157 | } else { | |
158 | if (unlikely(skb->protocol != htons(ETH_P_8021Q) || | |
159 | skb->len < VLAN_ETH_HLEN)) | |
160 | return 0; | |
161 | ||
162 | err = __pop_vlan_tci(skb, &tci); | |
163 | if (err) | |
164 | return err; | |
165 | } | |
166 | /* move next vlan tag to hw accel tag */ | |
167 | if (likely(skb->protocol != htons(ETH_P_8021Q) || | |
168 | skb->len < VLAN_ETH_HLEN)) | |
169 | return 0; | |
170 | ||
171 | err = __pop_vlan_tci(skb, &tci); | |
172 | if (unlikely(err)) | |
173 | return err; | |
174 | ||
86a9bad3 | 175 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci)); |
ccb1352e JG |
176 | return 0; |
177 | } | |
178 | ||
179 | static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan) | |
180 | { | |
181 | if (unlikely(vlan_tx_tag_present(skb))) { | |
182 | u16 current_tag; | |
183 | ||
184 | /* push down current VLAN tag */ | |
185 | current_tag = vlan_tx_tag_get(skb); | |
186 | ||
86a9bad3 | 187 | if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag)) |
ccb1352e JG |
188 | return -ENOMEM; |
189 | ||
190 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
191 | skb->csum = csum_add(skb->csum, csum_partial(skb->data | |
7b024082 | 192 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
ccb1352e JG |
193 | |
194 | } | |
86a9bad3 | 195 | __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); |
ccb1352e JG |
196 | return 0; |
197 | } | |
198 | ||
199 | static int set_eth_addr(struct sk_buff *skb, | |
200 | const struct ovs_key_ethernet *eth_key) | |
201 | { | |
202 | int err; | |
203 | err = make_writable(skb, ETH_HLEN); | |
204 | if (unlikely(err)) | |
205 | return err; | |
206 | ||
b34df5e8 PS |
207 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
208 | ||
8c63ff09 JP |
209 | ether_addr_copy(eth_hdr(skb)->h_source, eth_key->eth_src); |
210 | ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst); | |
ccb1352e | 211 | |
b34df5e8 PS |
212 | ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
213 | ||
ccb1352e JG |
214 | return 0; |
215 | } | |
216 | ||
217 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, | |
218 | __be32 *addr, __be32 new_addr) | |
219 | { | |
220 | int transport_len = skb->len - skb_transport_offset(skb); | |
221 | ||
222 | if (nh->protocol == IPPROTO_TCP) { | |
223 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
224 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, | |
225 | *addr, new_addr, 1); | |
226 | } else if (nh->protocol == IPPROTO_UDP) { | |
81e5d41d JG |
227 | if (likely(transport_len >= sizeof(struct udphdr))) { |
228 | struct udphdr *uh = udp_hdr(skb); | |
229 | ||
230 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
231 | inet_proto_csum_replace4(&uh->check, skb, | |
232 | *addr, new_addr, 1); | |
233 | if (!uh->check) | |
234 | uh->check = CSUM_MANGLED_0; | |
235 | } | |
236 | } | |
ccb1352e JG |
237 | } |
238 | ||
239 | csum_replace4(&nh->check, *addr, new_addr); | |
7539fadc | 240 | skb_clear_hash(skb); |
ccb1352e JG |
241 | *addr = new_addr; |
242 | } | |
243 | ||
3fdbd1ce AA |
244 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
245 | __be32 addr[4], const __be32 new_addr[4]) | |
246 | { | |
247 | int transport_len = skb->len - skb_transport_offset(skb); | |
248 | ||
856447d0 | 249 | if (l4_proto == NEXTHDR_TCP) { |
3fdbd1ce AA |
250 | if (likely(transport_len >= sizeof(struct tcphdr))) |
251 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
252 | addr, new_addr, 1); | |
856447d0 | 253 | } else if (l4_proto == NEXTHDR_UDP) { |
3fdbd1ce AA |
254 | if (likely(transport_len >= sizeof(struct udphdr))) { |
255 | struct udphdr *uh = udp_hdr(skb); | |
256 | ||
257 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
258 | inet_proto_csum_replace16(&uh->check, skb, | |
259 | addr, new_addr, 1); | |
260 | if (!uh->check) | |
261 | uh->check = CSUM_MANGLED_0; | |
262 | } | |
263 | } | |
856447d0 JG |
264 | } else if (l4_proto == NEXTHDR_ICMP) { |
265 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
266 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
267 | skb, addr, new_addr, 1); | |
3fdbd1ce AA |
268 | } |
269 | } | |
270 | ||
271 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, | |
272 | __be32 addr[4], const __be32 new_addr[4], | |
273 | bool recalculate_csum) | |
274 | { | |
275 | if (recalculate_csum) | |
276 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); | |
277 | ||
7539fadc | 278 | skb_clear_hash(skb); |
3fdbd1ce AA |
279 | memcpy(addr, new_addr, sizeof(__be32[4])); |
280 | } | |
281 | ||
282 | static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc) | |
283 | { | |
284 | nh->priority = tc >> 4; | |
285 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4); | |
286 | } | |
287 | ||
288 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl) | |
289 | { | |
290 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16; | |
291 | nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8; | |
292 | nh->flow_lbl[2] = fl & 0x000000FF; | |
293 | } | |
294 | ||
ccb1352e JG |
295 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl) |
296 | { | |
297 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); | |
298 | nh->ttl = new_ttl; | |
299 | } | |
300 | ||
301 | static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key) | |
302 | { | |
303 | struct iphdr *nh; | |
304 | int err; | |
305 | ||
306 | err = make_writable(skb, skb_network_offset(skb) + | |
307 | sizeof(struct iphdr)); | |
308 | if (unlikely(err)) | |
309 | return err; | |
310 | ||
311 | nh = ip_hdr(skb); | |
312 | ||
313 | if (ipv4_key->ipv4_src != nh->saddr) | |
314 | set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src); | |
315 | ||
316 | if (ipv4_key->ipv4_dst != nh->daddr) | |
317 | set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst); | |
318 | ||
319 | if (ipv4_key->ipv4_tos != nh->tos) | |
320 | ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos); | |
321 | ||
322 | if (ipv4_key->ipv4_ttl != nh->ttl) | |
323 | set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
3fdbd1ce AA |
328 | static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key) |
329 | { | |
330 | struct ipv6hdr *nh; | |
331 | int err; | |
332 | __be32 *saddr; | |
333 | __be32 *daddr; | |
334 | ||
335 | err = make_writable(skb, skb_network_offset(skb) + | |
336 | sizeof(struct ipv6hdr)); | |
337 | if (unlikely(err)) | |
338 | return err; | |
339 | ||
340 | nh = ipv6_hdr(skb); | |
341 | saddr = (__be32 *)&nh->saddr; | |
342 | daddr = (__be32 *)&nh->daddr; | |
343 | ||
344 | if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) | |
345 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr, | |
346 | ipv6_key->ipv6_src, true); | |
347 | ||
348 | if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) { | |
349 | unsigned int offset = 0; | |
350 | int flags = IP6_FH_F_SKIP_RH; | |
351 | bool recalc_csum = true; | |
352 | ||
353 | if (ipv6_ext_hdr(nh->nexthdr)) | |
354 | recalc_csum = ipv6_find_hdr(skb, &offset, | |
355 | NEXTHDR_ROUTING, NULL, | |
356 | &flags) != NEXTHDR_ROUTING; | |
357 | ||
358 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr, | |
359 | ipv6_key->ipv6_dst, recalc_csum); | |
360 | } | |
361 | ||
362 | set_ipv6_tc(nh, ipv6_key->ipv6_tclass); | |
363 | set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label)); | |
364 | nh->hop_limit = ipv6_key->ipv6_hlimit; | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
ccb1352e JG |
369 | /* Must follow make_writable() since that can move the skb data. */ |
370 | static void set_tp_port(struct sk_buff *skb, __be16 *port, | |
371 | __be16 new_port, __sum16 *check) | |
372 | { | |
373 | inet_proto_csum_replace2(check, skb, *port, new_port, 0); | |
374 | *port = new_port; | |
7539fadc | 375 | skb_clear_hash(skb); |
ccb1352e JG |
376 | } |
377 | ||
81e5d41d JG |
378 | static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port) |
379 | { | |
380 | struct udphdr *uh = udp_hdr(skb); | |
381 | ||
382 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { | |
383 | set_tp_port(skb, port, new_port, &uh->check); | |
384 | ||
385 | if (!uh->check) | |
386 | uh->check = CSUM_MANGLED_0; | |
387 | } else { | |
388 | *port = new_port; | |
7539fadc | 389 | skb_clear_hash(skb); |
81e5d41d JG |
390 | } |
391 | } | |
392 | ||
393 | static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key) | |
ccb1352e JG |
394 | { |
395 | struct udphdr *uh; | |
396 | int err; | |
397 | ||
398 | err = make_writable(skb, skb_transport_offset(skb) + | |
399 | sizeof(struct udphdr)); | |
400 | if (unlikely(err)) | |
401 | return err; | |
402 | ||
403 | uh = udp_hdr(skb); | |
404 | if (udp_port_key->udp_src != uh->source) | |
81e5d41d | 405 | set_udp_port(skb, &uh->source, udp_port_key->udp_src); |
ccb1352e JG |
406 | |
407 | if (udp_port_key->udp_dst != uh->dest) | |
81e5d41d | 408 | set_udp_port(skb, &uh->dest, udp_port_key->udp_dst); |
ccb1352e JG |
409 | |
410 | return 0; | |
411 | } | |
412 | ||
81e5d41d | 413 | static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key) |
ccb1352e JG |
414 | { |
415 | struct tcphdr *th; | |
416 | int err; | |
417 | ||
418 | err = make_writable(skb, skb_transport_offset(skb) + | |
419 | sizeof(struct tcphdr)); | |
420 | if (unlikely(err)) | |
421 | return err; | |
422 | ||
423 | th = tcp_hdr(skb); | |
424 | if (tcp_port_key->tcp_src != th->source) | |
425 | set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check); | |
426 | ||
427 | if (tcp_port_key->tcp_dst != th->dest) | |
428 | set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check); | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
a175a723 JS |
433 | static int set_sctp(struct sk_buff *skb, |
434 | const struct ovs_key_sctp *sctp_port_key) | |
435 | { | |
436 | struct sctphdr *sh; | |
437 | int err; | |
438 | unsigned int sctphoff = skb_transport_offset(skb); | |
439 | ||
440 | err = make_writable(skb, sctphoff + sizeof(struct sctphdr)); | |
441 | if (unlikely(err)) | |
442 | return err; | |
443 | ||
444 | sh = sctp_hdr(skb); | |
445 | if (sctp_port_key->sctp_src != sh->source || | |
446 | sctp_port_key->sctp_dst != sh->dest) { | |
447 | __le32 old_correct_csum, new_csum, old_csum; | |
448 | ||
449 | old_csum = sh->checksum; | |
450 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
451 | ||
452 | sh->source = sctp_port_key->sctp_src; | |
453 | sh->dest = sctp_port_key->sctp_dst; | |
454 | ||
455 | new_csum = sctp_compute_cksum(skb, sctphoff); | |
456 | ||
457 | /* Carry any checksum errors through. */ | |
458 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
459 | ||
7539fadc | 460 | skb_clear_hash(skb); |
a175a723 JS |
461 | } |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
ccb1352e JG |
466 | static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port) |
467 | { | |
468 | struct vport *vport; | |
469 | ||
470 | if (unlikely(!skb)) | |
471 | return -ENOMEM; | |
472 | ||
15eac2a7 | 473 | vport = ovs_vport_rcu(dp, out_port); |
ccb1352e JG |
474 | if (unlikely(!vport)) { |
475 | kfree_skb(skb); | |
476 | return -ENODEV; | |
477 | } | |
478 | ||
479 | ovs_vport_send(vport, skb); | |
480 | return 0; | |
481 | } | |
482 | ||
483 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 484 | struct sw_flow_key *key, const struct nlattr *attr) |
ccb1352e JG |
485 | { |
486 | struct dp_upcall_info upcall; | |
487 | const struct nlattr *a; | |
488 | int rem; | |
489 | ||
490 | upcall.cmd = OVS_PACKET_CMD_ACTION; | |
2ff3e4e4 | 491 | upcall.key = key; |
ccb1352e | 492 | upcall.userdata = NULL; |
15e47304 | 493 | upcall.portid = 0; |
ccb1352e JG |
494 | |
495 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
496 | a = nla_next(a, &rem)) { | |
497 | switch (nla_type(a)) { | |
498 | case OVS_USERSPACE_ATTR_USERDATA: | |
499 | upcall.userdata = a; | |
500 | break; | |
501 | ||
502 | case OVS_USERSPACE_ATTR_PID: | |
15e47304 | 503 | upcall.portid = nla_get_u32(a); |
ccb1352e JG |
504 | break; |
505 | } | |
506 | } | |
507 | ||
508 | return ovs_dp_upcall(dp, skb, &upcall); | |
509 | } | |
510 | ||
651887b0 SH |
511 | static bool last_action(const struct nlattr *a, int rem) |
512 | { | |
513 | return a->nla_len == rem; | |
514 | } | |
515 | ||
ccb1352e | 516 | static int sample(struct datapath *dp, struct sk_buff *skb, |
2ff3e4e4 | 517 | struct sw_flow_key *key, const struct nlattr *attr) |
ccb1352e JG |
518 | { |
519 | const struct nlattr *acts_list = NULL; | |
520 | const struct nlattr *a; | |
521 | int rem; | |
522 | ||
523 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
524 | a = nla_next(a, &rem)) { | |
525 | switch (nla_type(a)) { | |
526 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
63862b5b | 527 | if (prandom_u32() >= nla_get_u32(a)) |
ccb1352e JG |
528 | return 0; |
529 | break; | |
530 | ||
531 | case OVS_SAMPLE_ATTR_ACTIONS: | |
532 | acts_list = a; | |
533 | break; | |
534 | } | |
535 | } | |
536 | ||
651887b0 SH |
537 | rem = nla_len(acts_list); |
538 | a = nla_data(acts_list); | |
539 | ||
32ae87ff AZ |
540 | /* Actions list is empty, do nothing */ |
541 | if (unlikely(!rem)) | |
542 | return 0; | |
651887b0 | 543 | |
32ae87ff AZ |
544 | /* The only known usage of sample action is having a single user-space |
545 | * action. Treat this usage as a special case. | |
546 | * The output_userspace() should clone the skb to be sent to the | |
547 | * user space. This skb will be consumed by its caller. | |
651887b0 | 548 | */ |
32ae87ff AZ |
549 | if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE && |
550 | last_action(a, rem))) | |
551 | return output_userspace(dp, skb, key, a); | |
552 | ||
553 | skb = skb_clone(skb, GFP_ATOMIC); | |
554 | if (!skb) | |
555 | /* Skip the sample action when out of memory. */ | |
556 | return 0; | |
557 | ||
971427f3 AZ |
558 | if (!add_deferred_actions(skb, key, a)) { |
559 | if (net_ratelimit()) | |
560 | pr_warn("%s: deferred actions limit reached, dropping sample action\n", | |
561 | ovs_dp_name(dp)); | |
562 | ||
563 | kfree_skb(skb); | |
564 | } | |
565 | return 0; | |
566 | } | |
567 | ||
568 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, | |
569 | const struct nlattr *attr) | |
570 | { | |
571 | struct ovs_action_hash *hash_act = nla_data(attr); | |
572 | u32 hash = 0; | |
573 | ||
574 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
575 | hash = skb_get_hash(skb); | |
576 | hash = jhash_1word(hash, hash_act->hash_basis); | |
577 | if (!hash) | |
578 | hash = 0x1; | |
579 | ||
580 | key->ovs_flow_hash = hash; | |
ccb1352e JG |
581 | } |
582 | ||
583 | static int execute_set_action(struct sk_buff *skb, | |
584 | const struct nlattr *nested_attr) | |
585 | { | |
586 | int err = 0; | |
587 | ||
588 | switch (nla_type(nested_attr)) { | |
589 | case OVS_KEY_ATTR_PRIORITY: | |
590 | skb->priority = nla_get_u32(nested_attr); | |
591 | break; | |
592 | ||
39c7caeb AA |
593 | case OVS_KEY_ATTR_SKB_MARK: |
594 | skb->mark = nla_get_u32(nested_attr); | |
595 | break; | |
596 | ||
f0b128c1 JG |
597 | case OVS_KEY_ATTR_TUNNEL_INFO: |
598 | OVS_CB(skb)->egress_tun_info = nla_data(nested_attr); | |
7d5437c7 PS |
599 | break; |
600 | ||
ccb1352e JG |
601 | case OVS_KEY_ATTR_ETHERNET: |
602 | err = set_eth_addr(skb, nla_data(nested_attr)); | |
603 | break; | |
604 | ||
605 | case OVS_KEY_ATTR_IPV4: | |
606 | err = set_ipv4(skb, nla_data(nested_attr)); | |
607 | break; | |
608 | ||
3fdbd1ce AA |
609 | case OVS_KEY_ATTR_IPV6: |
610 | err = set_ipv6(skb, nla_data(nested_attr)); | |
611 | break; | |
612 | ||
ccb1352e | 613 | case OVS_KEY_ATTR_TCP: |
81e5d41d | 614 | err = set_tcp(skb, nla_data(nested_attr)); |
ccb1352e JG |
615 | break; |
616 | ||
617 | case OVS_KEY_ATTR_UDP: | |
81e5d41d | 618 | err = set_udp(skb, nla_data(nested_attr)); |
ccb1352e | 619 | break; |
a175a723 JS |
620 | |
621 | case OVS_KEY_ATTR_SCTP: | |
622 | err = set_sctp(skb, nla_data(nested_attr)); | |
623 | break; | |
ccb1352e JG |
624 | } |
625 | ||
626 | return err; | |
627 | } | |
628 | ||
971427f3 AZ |
629 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
630 | struct sw_flow_key *key, | |
631 | const struct nlattr *a, int rem) | |
632 | { | |
633 | struct deferred_action *da; | |
634 | int err; | |
635 | ||
636 | err = ovs_flow_key_update(skb, key); | |
637 | if (err) | |
638 | return err; | |
639 | ||
640 | if (!last_action(a, rem)) { | |
641 | /* Recirc action is the not the last action | |
642 | * of the action list, need to clone the skb. | |
643 | */ | |
644 | skb = skb_clone(skb, GFP_ATOMIC); | |
645 | ||
646 | /* Skip the recirc action when out of memory, but | |
647 | * continue on with the rest of the action list. | |
648 | */ | |
649 | if (!skb) | |
650 | return 0; | |
651 | } | |
652 | ||
653 | da = add_deferred_actions(skb, key, NULL); | |
654 | if (da) { | |
655 | da->pkt_key.recirc_id = nla_get_u32(a); | |
656 | } else { | |
657 | kfree_skb(skb); | |
658 | ||
659 | if (net_ratelimit()) | |
660 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
661 | ovs_dp_name(dp)); | |
662 | } | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
ccb1352e JG |
667 | /* Execute a list of actions against 'skb'. */ |
668 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 669 | struct sw_flow_key *key, |
651887b0 | 670 | const struct nlattr *attr, int len) |
ccb1352e JG |
671 | { |
672 | /* Every output action needs a separate clone of 'skb', but the common | |
673 | * case is just a single output action, so that doing a clone and | |
674 | * then freeing the original skbuff is wasteful. So the following code | |
675 | * is slightly obscure just to avoid that. */ | |
676 | int prev_port = -1; | |
677 | const struct nlattr *a; | |
678 | int rem; | |
679 | ||
680 | for (a = attr, rem = len; rem > 0; | |
681 | a = nla_next(a, &rem)) { | |
682 | int err = 0; | |
683 | ||
684 | if (prev_port != -1) { | |
685 | do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port); | |
686 | prev_port = -1; | |
687 | } | |
688 | ||
689 | switch (nla_type(a)) { | |
690 | case OVS_ACTION_ATTR_OUTPUT: | |
691 | prev_port = nla_get_u32(a); | |
692 | break; | |
693 | ||
694 | case OVS_ACTION_ATTR_USERSPACE: | |
2ff3e4e4 | 695 | output_userspace(dp, skb, key, a); |
ccb1352e JG |
696 | break; |
697 | ||
971427f3 AZ |
698 | case OVS_ACTION_ATTR_HASH: |
699 | execute_hash(skb, key, a); | |
700 | break; | |
701 | ||
ccb1352e JG |
702 | case OVS_ACTION_ATTR_PUSH_VLAN: |
703 | err = push_vlan(skb, nla_data(a)); | |
704 | if (unlikely(err)) /* skb already freed. */ | |
705 | return err; | |
706 | break; | |
707 | ||
708 | case OVS_ACTION_ATTR_POP_VLAN: | |
709 | err = pop_vlan(skb); | |
710 | break; | |
711 | ||
971427f3 AZ |
712 | case OVS_ACTION_ATTR_RECIRC: |
713 | err = execute_recirc(dp, skb, key, a, rem); | |
714 | if (last_action(a, rem)) { | |
715 | /* If this is the last action, the skb has | |
716 | * been consumed or freed. | |
717 | * Return immediately. | |
718 | */ | |
719 | return err; | |
720 | } | |
721 | break; | |
722 | ||
ccb1352e JG |
723 | case OVS_ACTION_ATTR_SET: |
724 | err = execute_set_action(skb, nla_data(a)); | |
725 | break; | |
726 | ||
727 | case OVS_ACTION_ATTR_SAMPLE: | |
2ff3e4e4 | 728 | err = sample(dp, skb, key, a); |
ccb1352e JG |
729 | break; |
730 | } | |
731 | ||
732 | if (unlikely(err)) { | |
733 | kfree_skb(skb); | |
734 | return err; | |
735 | } | |
736 | } | |
737 | ||
651887b0 | 738 | if (prev_port != -1) |
ccb1352e | 739 | do_output(dp, skb, prev_port); |
651887b0 | 740 | else |
ccb1352e JG |
741 | consume_skb(skb); |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
971427f3 AZ |
746 | static void process_deferred_actions(struct datapath *dp) |
747 | { | |
748 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
749 | ||
750 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
751 | if (action_fifo_is_empty(fifo)) | |
752 | return; | |
753 | ||
754 | /* Finishing executing all deferred actions. */ | |
755 | do { | |
756 | struct deferred_action *da = action_fifo_get(fifo); | |
757 | struct sk_buff *skb = da->skb; | |
758 | struct sw_flow_key *key = &da->pkt_key; | |
759 | const struct nlattr *actions = da->actions; | |
760 | ||
761 | if (actions) | |
762 | do_execute_actions(dp, skb, key, actions, | |
763 | nla_len(actions)); | |
764 | else | |
765 | ovs_dp_process_packet(skb, key); | |
766 | } while (!action_fifo_is_empty(fifo)); | |
767 | ||
768 | /* Reset FIFO for the next packet. */ | |
769 | action_fifo_init(fifo); | |
770 | } | |
771 | ||
ccb1352e | 772 | /* Execute a list of actions against 'skb'. */ |
2ff3e4e4 PS |
773 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
774 | struct sw_flow_key *key) | |
ccb1352e | 775 | { |
971427f3 AZ |
776 | int level = this_cpu_read(exec_actions_level); |
777 | struct sw_flow_actions *acts; | |
778 | int err; | |
779 | ||
780 | acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts); | |
781 | ||
782 | this_cpu_inc(exec_actions_level); | |
f0b128c1 | 783 | OVS_CB(skb)->egress_tun_info = NULL; |
971427f3 AZ |
784 | err = do_execute_actions(dp, skb, key, |
785 | acts->actions, acts->actions_len); | |
786 | ||
787 | if (!level) | |
788 | process_deferred_actions(dp); | |
789 | ||
790 | this_cpu_dec(exec_actions_level); | |
791 | return err; | |
792 | } | |
793 | ||
794 | int action_fifos_init(void) | |
795 | { | |
796 | action_fifos = alloc_percpu(struct action_fifo); | |
797 | if (!action_fifos) | |
798 | return -ENOMEM; | |
ccb1352e | 799 | |
971427f3 AZ |
800 | return 0; |
801 | } | |
802 | ||
803 | void action_fifos_exit(void) | |
804 | { | |
805 | free_percpu(action_fifos); | |
ccb1352e | 806 | } |