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064af421 | 1 | /* |
a6059080 | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
a14bc59f | 3 | * |
a9a29d22 JG |
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 | |
064af421 BP |
17 | */ |
18 | ||
e9141eec PS |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
064af421 BP |
21 | #include <linux/skbuff.h> |
22 | #include <linux/in.h> | |
23 | #include <linux/ip.h> | |
077257b8 | 24 | #include <linux/openvswitch.h> |
10f72e3d | 25 | #include <linux/sctp.h> |
064af421 BP |
26 | #include <linux/tcp.h> |
27 | #include <linux/udp.h> | |
28 | #include <linux/in6.h> | |
401eeb92 | 29 | #include <linux/if_arp.h> |
064af421 BP |
30 | #include <linux/if_vlan.h> |
31 | #include <net/ip.h> | |
bc7a5acd | 32 | #include <net/ipv6.h> |
064af421 | 33 | #include <net/checksum.h> |
530180fd | 34 | #include <net/dsfield.h> |
10f72e3d | 35 | #include <net/sctp/checksum.h> |
f2459fe7 | 36 | |
f2459fe7 | 37 | #include "datapath.h" |
ccf43786 SH |
38 | #include "gso.h" |
39 | #include "mpls.h" | |
6ce39213 | 40 | #include "vlan.h" |
f2459fe7 | 41 | #include "vport.h" |
064af421 | 42 | |
e74d4817 PS |
43 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
44 | struct sw_flow_key *key, | |
45 | const struct nlattr *attr, int len); | |
46 | ||
2c8c4fb7 AZ |
47 | struct deferred_action { |
48 | struct sk_buff *skb; | |
49 | const struct nlattr *actions; | |
50 | ||
51 | /* Store pkt_key clone when creating deferred action. */ | |
52 | struct sw_flow_key pkt_key; | |
53 | }; | |
54 | ||
55 | #define DEFERRED_ACTION_FIFO_SIZE 10 | |
56 | struct action_fifo { | |
57 | int head; | |
58 | int tail; | |
59 | /* Deferred action fifo queue storage. */ | |
60 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; | |
61 | }; | |
62 | ||
63 | static struct action_fifo __percpu *action_fifos; | |
64 | #define EXEC_ACTIONS_LEVEL_LIMIT 4 /* limit used to detect packet | |
af465b67 PS |
65 | * looping by the network stack |
66 | */ | |
2c8c4fb7 AZ |
67 | static DEFINE_PER_CPU(int, exec_actions_level); |
68 | ||
69 | static void action_fifo_init(struct action_fifo *fifo) | |
70 | { | |
71 | fifo->head = 0; | |
72 | fifo->tail = 0; | |
73 | } | |
74 | ||
f1f60b85 | 75 | static bool action_fifo_is_empty(const struct action_fifo *fifo) |
2c8c4fb7 AZ |
76 | { |
77 | return (fifo->head == fifo->tail); | |
78 | } | |
79 | ||
e74d4817 | 80 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) |
2c8c4fb7 AZ |
81 | { |
82 | if (action_fifo_is_empty(fifo)) | |
83 | return NULL; | |
84 | ||
85 | return &fifo->fifo[fifo->tail++]; | |
86 | } | |
87 | ||
e74d4817 | 88 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) |
2c8c4fb7 AZ |
89 | { |
90 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) | |
91 | return NULL; | |
92 | ||
93 | return &fifo->fifo[fifo->head++]; | |
94 | } | |
95 | ||
e74d4817 PS |
96 | /* Return queue entry if fifo is not full */ |
97 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, | |
f1f60b85 | 98 | const struct sw_flow_key *key, |
e74d4817 | 99 | const struct nlattr *attr) |
2c8c4fb7 AZ |
100 | { |
101 | struct action_fifo *fifo; | |
102 | struct deferred_action *da; | |
103 | ||
104 | fifo = this_cpu_ptr(action_fifos); | |
105 | da = action_fifo_put(fifo); | |
106 | if (da) { | |
107 | da->skb = skb; | |
108 | da->actions = attr; | |
e74d4817 | 109 | da->pkt_key = *key; |
2c8c4fb7 AZ |
110 | } |
111 | ||
e74d4817 | 112 | return da; |
e16138e2 PS |
113 | } |
114 | ||
e74d4817 | 115 | static void invalidate_flow_key(struct sw_flow_key *key) |
e16138e2 | 116 | { |
e74d4817 | 117 | key->eth.type = htons(0); |
e16138e2 PS |
118 | } |
119 | ||
f1f60b85 | 120 | static bool is_flow_key_valid(const struct sw_flow_key *key) |
e16138e2 | 121 | { |
e74d4817 | 122 | return !!key->eth.type; |
e16138e2 PS |
123 | } |
124 | ||
10db8b20 | 125 | static int make_writable(struct sk_buff *skb, int write_len) |
064af421 | 126 | { |
f1112037 JB |
127 | if (!pskb_may_pull(skb, write_len)) |
128 | return -ENOMEM; | |
129 | ||
10db8b20 JG |
130 | if (!skb_cloned(skb) || skb_clone_writable(skb, write_len)) |
131 | return 0; | |
0cd8a05e | 132 | |
10db8b20 | 133 | return pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
064af421 BP |
134 | } |
135 | ||
ccf43786 SH |
136 | /* The end of the mac header. |
137 | * | |
138 | * For non-MPLS skbs this will correspond to the network header. | |
139 | * For MPLS skbs it will be before the network_header as the MPLS | |
140 | * label stack lies between the end of the mac header and the network | |
141 | * header. That is, for MPLS skbs the end of the mac header | |
142 | * is the top of the MPLS label stack. | |
143 | */ | |
144 | static unsigned char *mac_header_end(const struct sk_buff *skb) | |
145 | { | |
146 | return skb_mac_header(skb) + skb->mac_len; | |
147 | } | |
148 | ||
e74d4817 | 149 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
ccf43786 SH |
150 | const struct ovs_action_push_mpls *mpls) |
151 | { | |
152 | __be32 *new_mpls_lse; | |
153 | struct ethhdr *hdr; | |
154 | ||
155 | if (skb_cow_head(skb, MPLS_HLEN) < 0) | |
156 | return -ENOMEM; | |
157 | ||
158 | skb_push(skb, MPLS_HLEN); | |
159 | memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb), | |
160 | skb->mac_len); | |
161 | skb_reset_mac_header(skb); | |
162 | ||
163 | new_mpls_lse = (__be32 *)mac_header_end(skb); | |
164 | *new_mpls_lse = mpls->mpls_lse; | |
165 | ||
166 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
167 | skb->csum = csum_add(skb->csum, csum_partial(new_mpls_lse, | |
168 | MPLS_HLEN, 0)); | |
169 | ||
170 | hdr = eth_hdr(skb); | |
171 | hdr->h_proto = mpls->mpls_ethertype; | |
172 | if (!ovs_skb_get_inner_protocol(skb)) | |
173 | ovs_skb_set_inner_protocol(skb, skb->protocol); | |
174 | skb->protocol = mpls->mpls_ethertype; | |
e74d4817 | 175 | invalidate_flow_key(key); |
ccf43786 SH |
176 | return 0; |
177 | } | |
178 | ||
e74d4817 PS |
179 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
180 | const __be16 ethertype) | |
ccf43786 SH |
181 | { |
182 | struct ethhdr *hdr; | |
183 | int err; | |
184 | ||
185 | err = make_writable(skb, skb->mac_len + MPLS_HLEN); | |
186 | if (unlikely(err)) | |
187 | return err; | |
188 | ||
189 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
190 | skb->csum = csum_sub(skb->csum, | |
191 | csum_partial(mac_header_end(skb), | |
192 | MPLS_HLEN, 0)); | |
193 | ||
194 | memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), | |
195 | skb->mac_len); | |
196 | ||
197 | __skb_pull(skb, MPLS_HLEN); | |
198 | skb_reset_mac_header(skb); | |
199 | ||
200 | /* mac_header_end() is used to locate the ethertype | |
201 | * field correctly in the presence of VLAN tags. | |
202 | */ | |
203 | hdr = (struct ethhdr *)(mac_header_end(skb) - ETH_HLEN); | |
204 | hdr->h_proto = ethertype; | |
205 | if (eth_p_mpls(skb->protocol)) | |
206 | skb->protocol = ethertype; | |
e74d4817 | 207 | invalidate_flow_key(key); |
ccf43786 SH |
208 | return 0; |
209 | } | |
210 | ||
e74d4817 PS |
211 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
212 | const __be32 *mpls_lse) | |
ccf43786 SH |
213 | { |
214 | __be32 *stack = (__be32 *)mac_header_end(skb); | |
215 | int err; | |
216 | ||
217 | err = make_writable(skb, skb->mac_len + MPLS_HLEN); | |
218 | if (unlikely(err)) | |
219 | return err; | |
220 | ||
221 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
222 | __be32 diff[] = { ~(*stack), *mpls_lse }; | |
223 | skb->csum = ~csum_partial((char *)diff, sizeof(diff), | |
224 | ~skb->csum); | |
225 | } | |
226 | ||
227 | *stack = *mpls_lse; | |
e74d4817 | 228 | key->mpls.top_lse = *mpls_lse; |
ccf43786 SH |
229 | return 0; |
230 | } | |
231 | ||
b2492cb7 | 232 | /* remove VLAN header from packet and update csum accordingly. */ |
d9065a90 | 233 | static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci) |
064af421 | 234 | { |
ceb176fd | 235 | struct vlan_hdr *vhdr; |
10db8b20 | 236 | int err; |
064af421 | 237 | |
10db8b20 JG |
238 | err = make_writable(skb, VLAN_ETH_HLEN); |
239 | if (unlikely(err)) | |
240 | return err; | |
6ce39213 | 241 | |
237c4f2a | 242 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
635c9298 | 243 | skb->csum = csum_sub(skb->csum, csum_partial(skb->data |
af9d14a8 | 244 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
635c9298 | 245 | |
ceb176fd PS |
246 | vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN); |
247 | *current_tci = vhdr->h_vlan_TCI; | |
d9065a90 | 248 | |
6ce39213 | 249 | memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); |
ceb176fd | 250 | __skb_pull(skb, VLAN_HLEN); |
064af421 | 251 | |
ceb176fd | 252 | vlan_set_encap_proto(skb, vhdr); |
064af421 | 253 | skb->mac_header += VLAN_HLEN; |
ccf43786 SH |
254 | /* Update mac_len for subsequent MPLS actions */ |
255 | skb->mac_len -= VLAN_HLEN; | |
064af421 | 256 | |
10db8b20 | 257 | return 0; |
064af421 BP |
258 | } |
259 | ||
e74d4817 | 260 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 261 | { |
d9065a90 PS |
262 | __be16 tci; |
263 | int err; | |
10db8b20 | 264 | |
d9065a90 PS |
265 | if (likely(vlan_tx_tag_present(skb))) { |
266 | vlan_set_tci(skb, 0); | |
267 | } else { | |
268 | if (unlikely(skb->protocol != htons(ETH_P_8021Q) || | |
fb516ed8 | 269 | skb->len < VLAN_ETH_HLEN)) |
10db8b20 | 270 | return 0; |
064af421 | 271 | |
d9065a90 PS |
272 | err = __pop_vlan_tci(skb, &tci); |
273 | if (err) | |
10db8b20 | 274 | return err; |
064af421 | 275 | } |
d9065a90 PS |
276 | /* move next vlan tag to hw accel tag */ |
277 | if (likely(skb->protocol != htons(ETH_P_8021Q) || | |
e16138e2 | 278 | skb->len < VLAN_ETH_HLEN)) { |
e74d4817 | 279 | key->eth.tci = 0; |
d9065a90 | 280 | return 0; |
e16138e2 | 281 | } |
d9065a90 | 282 | |
e74d4817 | 283 | invalidate_flow_key(key); |
d9065a90 PS |
284 | err = __pop_vlan_tci(skb, &tci); |
285 | if (unlikely(err)) | |
286 | return err; | |
064af421 | 287 | |
9b764edf | 288 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci)); |
d9065a90 PS |
289 | return 0; |
290 | } | |
291 | ||
e74d4817 PS |
292 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
293 | const struct ovs_action_push_vlan *vlan) | |
d9065a90 PS |
294 | { |
295 | if (unlikely(vlan_tx_tag_present(skb))) { | |
296 | u16 current_tag; | |
297 | ||
298 | /* push down current VLAN tag */ | |
299 | current_tag = vlan_tx_tag_get(skb); | |
300 | ||
9b764edf | 301 | if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag)) |
d9065a90 | 302 | return -ENOMEM; |
10db8b20 | 303 | |
ccf43786 SH |
304 | /* Update mac_len for subsequent MPLS actions */ |
305 | skb->mac_len += VLAN_HLEN; | |
306 | ||
237c4f2a | 307 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
d9065a90 | 308 | skb->csum = csum_add(skb->csum, csum_partial(skb->data |
af9d14a8 | 309 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
d9065a90 | 310 | |
e74d4817 | 311 | invalidate_flow_key(key); |
e16138e2 | 312 | } else { |
e74d4817 | 313 | key->eth.tci = vlan->vlan_tci; |
d9065a90 | 314 | } |
9b764edf | 315 | __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); |
10db8b20 | 316 | return 0; |
064af421 BP |
317 | } |
318 | ||
e74d4817 | 319 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *key, |
4edb9ae9 | 320 | const struct ovs_key_ethernet *eth_key) |
ca78c6b6 | 321 | { |
4edb9ae9 PS |
322 | int err; |
323 | err = make_writable(skb, ETH_HLEN); | |
324 | if (unlikely(err)) | |
325 | return err; | |
326 | ||
237c4f2a | 327 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 328 | |
982a47ec JP |
329 | ether_addr_copy(eth_hdr(skb)->h_source, eth_key->eth_src); |
330 | ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst); | |
4edb9ae9 | 331 | |
237c4f2a | 332 | ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 333 | |
e74d4817 PS |
334 | ether_addr_copy(key->eth.src, eth_key->eth_src); |
335 | ether_addr_copy(key->eth.dst, eth_key->eth_dst); | |
4edb9ae9 | 336 | return 0; |
ca78c6b6 BP |
337 | } |
338 | ||
4edb9ae9 | 339 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
e16138e2 | 340 | __be32 *addr, __be32 new_addr) |
ca78c6b6 BP |
341 | { |
342 | int transport_len = skb->len - skb_transport_offset(skb); | |
4edb9ae9 PS |
343 | |
344 | if (nh->protocol == IPPROTO_TCP) { | |
ca78c6b6 | 345 | if (likely(transport_len >= sizeof(struct tcphdr))) |
4edb9ae9 PS |
346 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, |
347 | *addr, new_addr, 1); | |
348 | } else if (nh->protocol == IPPROTO_UDP) { | |
55ce87bc JG |
349 | if (likely(transport_len >= sizeof(struct udphdr))) { |
350 | struct udphdr *uh = udp_hdr(skb); | |
351 | ||
237c4f2a | 352 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
55ce87bc JG |
353 | inet_proto_csum_replace4(&uh->check, skb, |
354 | *addr, new_addr, 1); | |
355 | if (!uh->check) | |
356 | uh->check = CSUM_MANGLED_0; | |
357 | } | |
358 | } | |
ca78c6b6 | 359 | } |
4edb9ae9 PS |
360 | |
361 | csum_replace4(&nh->check, *addr, new_addr); | |
e2f3178f | 362 | skb_clear_hash(skb); |
4edb9ae9 | 363 | *addr = new_addr; |
ca78c6b6 BP |
364 | } |
365 | ||
bc7a5acd AA |
366 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
367 | __be32 addr[4], const __be32 new_addr[4]) | |
368 | { | |
369 | int transport_len = skb->len - skb_transport_offset(skb); | |
370 | ||
00894212 | 371 | if (l4_proto == NEXTHDR_TCP) { |
bc7a5acd AA |
372 | if (likely(transport_len >= sizeof(struct tcphdr))) |
373 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
374 | addr, new_addr, 1); | |
00894212 | 375 | } else if (l4_proto == NEXTHDR_UDP) { |
bc7a5acd AA |
376 | if (likely(transport_len >= sizeof(struct udphdr))) { |
377 | struct udphdr *uh = udp_hdr(skb); | |
378 | ||
237c4f2a | 379 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
bc7a5acd AA |
380 | inet_proto_csum_replace16(&uh->check, skb, |
381 | addr, new_addr, 1); | |
382 | if (!uh->check) | |
383 | uh->check = CSUM_MANGLED_0; | |
384 | } | |
385 | } | |
00894212 JG |
386 | } else if (l4_proto == NEXTHDR_ICMP) { |
387 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
388 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
389 | skb, addr, new_addr, 1); | |
bc7a5acd AA |
390 | } |
391 | } | |
392 | ||
393 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, | |
394 | __be32 addr[4], const __be32 new_addr[4], | |
395 | bool recalculate_csum) | |
396 | { | |
51cf5e71 | 397 | if (likely(recalculate_csum)) |
bc7a5acd AA |
398 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); |
399 | ||
e2f3178f | 400 | skb_clear_hash(skb); |
bc7a5acd AA |
401 | memcpy(addr, new_addr, sizeof(__be32[4])); |
402 | } | |
403 | ||
404 | static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc) | |
405 | { | |
406 | nh->priority = tc >> 4; | |
407 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4); | |
408 | } | |
409 | ||
410 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl) | |
411 | { | |
412 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16; | |
413 | nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8; | |
414 | nh->flow_lbl[2] = fl & 0x000000FF; | |
415 | } | |
416 | ||
a61680c6 JP |
417 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl) |
418 | { | |
419 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); | |
420 | nh->ttl = new_ttl; | |
421 | } | |
422 | ||
e74d4817 PS |
423 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *key, |
424 | const struct ovs_key_ipv4 *ipv4_key) | |
064af421 | 425 | { |
ca78c6b6 | 426 | struct iphdr *nh; |
10db8b20 | 427 | int err; |
ca78c6b6 | 428 | |
10db8b20 JG |
429 | err = make_writable(skb, skb_network_offset(skb) + |
430 | sizeof(struct iphdr)); | |
431 | if (unlikely(err)) | |
432 | return err; | |
ca78c6b6 BP |
433 | |
434 | nh = ip_hdr(skb); | |
ca78c6b6 | 435 | |
e16138e2 | 436 | if (ipv4_key->ipv4_src != nh->saddr) { |
4edb9ae9 | 437 | set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src); |
e74d4817 | 438 | key->ipv4.addr.src = ipv4_key->ipv4_src; |
e16138e2 | 439 | } |
ca78c6b6 | 440 | |
e16138e2 | 441 | if (ipv4_key->ipv4_dst != nh->daddr) { |
4edb9ae9 | 442 | set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst); |
e74d4817 | 443 | key->ipv4.addr.dst = ipv4_key->ipv4_dst; |
e16138e2 | 444 | } |
a4a26436 | 445 | |
e16138e2 | 446 | if (ipv4_key->ipv4_tos != nh->tos) { |
530180fd | 447 | ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos); |
e74d4817 | 448 | key->ip.tos = nh->tos; |
e16138e2 | 449 | } |
ca78c6b6 | 450 | |
e16138e2 | 451 | if (ipv4_key->ipv4_ttl != nh->ttl) { |
a61680c6 | 452 | set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl); |
e74d4817 | 453 | key->ip.ttl = ipv4_key->ipv4_ttl; |
e16138e2 | 454 | } |
a61680c6 | 455 | |
10db8b20 | 456 | return 0; |
064af421 BP |
457 | } |
458 | ||
e74d4817 PS |
459 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *key, |
460 | const struct ovs_key_ipv6 *ipv6_key) | |
bc7a5acd AA |
461 | { |
462 | struct ipv6hdr *nh; | |
463 | int err; | |
464 | __be32 *saddr; | |
465 | __be32 *daddr; | |
466 | ||
467 | err = make_writable(skb, skb_network_offset(skb) + | |
468 | sizeof(struct ipv6hdr)); | |
469 | if (unlikely(err)) | |
470 | return err; | |
471 | ||
472 | nh = ipv6_hdr(skb); | |
473 | saddr = (__be32 *)&nh->saddr; | |
474 | daddr = (__be32 *)&nh->daddr; | |
475 | ||
e16138e2 | 476 | if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) { |
bc7a5acd AA |
477 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr, |
478 | ipv6_key->ipv6_src, true); | |
e74d4817 PS |
479 | memcpy(&key->ipv6.addr.src, ipv6_key->ipv6_src, |
480 | sizeof(ipv6_key->ipv6_src)); | |
e16138e2 | 481 | } |
bc7a5acd AA |
482 | |
483 | if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) { | |
484 | unsigned int offset = 0; | |
485 | int flags = OVS_IP6T_FH_F_SKIP_RH; | |
486 | bool recalc_csum = true; | |
487 | ||
488 | if (ipv6_ext_hdr(nh->nexthdr)) | |
489 | recalc_csum = ipv6_find_hdr(skb, &offset, | |
490 | NEXTHDR_ROUTING, NULL, | |
491 | &flags) != NEXTHDR_ROUTING; | |
492 | ||
493 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr, | |
494 | ipv6_key->ipv6_dst, recalc_csum); | |
e74d4817 PS |
495 | memcpy(&key->ipv6.addr.dst, ipv6_key->ipv6_dst, |
496 | sizeof(ipv6_key->ipv6_dst)); | |
bc7a5acd AA |
497 | } |
498 | ||
499 | set_ipv6_tc(nh, ipv6_key->ipv6_tclass); | |
e74d4817 | 500 | key->ip.tos = ipv6_get_dsfield(nh); |
e16138e2 | 501 | |
bc7a5acd | 502 | set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label)); |
e74d4817 | 503 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); |
bc7a5acd | 504 | |
e16138e2 | 505 | nh->hop_limit = ipv6_key->ipv6_hlimit; |
e74d4817 | 506 | key->ip.ttl = ipv6_key->ipv6_hlimit; |
bc7a5acd AA |
507 | return 0; |
508 | } | |
509 | ||
4edb9ae9 PS |
510 | /* Must follow make_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) | |
959a2ecd | 513 | { |
4edb9ae9 PS |
514 | inet_proto_csum_replace2(check, skb, *port, new_port, 0); |
515 | *port = new_port; | |
e2f3178f | 516 | skb_clear_hash(skb); |
4edb9ae9 | 517 | } |
10db8b20 | 518 | |
55ce87bc JG |
519 | static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port) |
520 | { | |
521 | struct udphdr *uh = udp_hdr(skb); | |
522 | ||
237c4f2a | 523 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
55ce87bc JG |
524 | set_tp_port(skb, port, new_port, &uh->check); |
525 | ||
526 | if (!uh->check) | |
527 | uh->check = CSUM_MANGLED_0; | |
528 | } else { | |
529 | *port = new_port; | |
e2f3178f | 530 | skb_clear_hash(skb); |
55ce87bc JG |
531 | } |
532 | } | |
533 | ||
e74d4817 PS |
534 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *key, |
535 | const struct ovs_key_udp *udp_port_key) | |
4edb9ae9 PS |
536 | { |
537 | struct udphdr *uh; | |
538 | int err; | |
10db8b20 | 539 | |
4edb9ae9 PS |
540 | err = make_writable(skb, skb_transport_offset(skb) + |
541 | sizeof(struct udphdr)); | |
10db8b20 JG |
542 | if (unlikely(err)) |
543 | return err; | |
544 | ||
4edb9ae9 | 545 | uh = udp_hdr(skb); |
e16138e2 | 546 | if (udp_port_key->udp_src != uh->source) { |
55ce87bc | 547 | set_udp_port(skb, &uh->source, udp_port_key->udp_src); |
e74d4817 | 548 | key->tp.src = udp_port_key->udp_src; |
e16138e2 | 549 | } |
4edb9ae9 | 550 | |
e16138e2 | 551 | if (udp_port_key->udp_dst != uh->dest) { |
55ce87bc | 552 | set_udp_port(skb, &uh->dest, udp_port_key->udp_dst); |
e74d4817 | 553 | key->tp.dst = udp_port_key->udp_dst; |
e16138e2 | 554 | } |
10db8b20 JG |
555 | |
556 | return 0; | |
959a2ecd JP |
557 | } |
558 | ||
e74d4817 PS |
559 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *key, |
560 | const struct ovs_key_tcp *tcp_port_key) | |
064af421 | 561 | { |
4edb9ae9 | 562 | struct tcphdr *th; |
10db8b20 | 563 | int err; |
064af421 | 564 | |
10db8b20 JG |
565 | err = make_writable(skb, skb_transport_offset(skb) + |
566 | sizeof(struct tcphdr)); | |
567 | if (unlikely(err)) | |
568 | return err; | |
ca78c6b6 | 569 | |
4edb9ae9 | 570 | th = tcp_hdr(skb); |
e16138e2 | 571 | if (tcp_port_key->tcp_src != th->source) { |
4edb9ae9 | 572 | set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check); |
e74d4817 | 573 | key->tp.src = tcp_port_key->tcp_src; |
e16138e2 | 574 | } |
064af421 | 575 | |
e16138e2 | 576 | if (tcp_port_key->tcp_dst != th->dest) { |
4edb9ae9 | 577 | set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check); |
e74d4817 | 578 | key->tp.dst = tcp_port_key->tcp_dst; |
e16138e2 | 579 | } |
ca78c6b6 | 580 | |
10db8b20 | 581 | return 0; |
064af421 BP |
582 | } |
583 | ||
e74d4817 | 584 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *key, |
e16138e2 | 585 | const struct ovs_key_sctp *sctp_port_key) |
10f72e3d JS |
586 | { |
587 | struct sctphdr *sh; | |
588 | int err; | |
589 | unsigned int sctphoff = skb_transport_offset(skb); | |
590 | ||
591 | err = make_writable(skb, sctphoff + sizeof(struct sctphdr)); | |
592 | if (unlikely(err)) | |
593 | return err; | |
594 | ||
595 | sh = sctp_hdr(skb); | |
596 | if (sctp_port_key->sctp_src != sh->source || | |
597 | sctp_port_key->sctp_dst != sh->dest) { | |
598 | __le32 old_correct_csum, new_csum, old_csum; | |
599 | ||
600 | old_csum = sh->checksum; | |
601 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
602 | ||
603 | sh->source = sctp_port_key->sctp_src; | |
604 | sh->dest = sctp_port_key->sctp_dst; | |
605 | ||
606 | new_csum = sctp_compute_cksum(skb, sctphoff); | |
607 | ||
608 | /* Carry any checksum errors through. */ | |
609 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
610 | ||
e2f3178f | 611 | skb_clear_hash(skb); |
e74d4817 PS |
612 | key->tp.src = sctp_port_key->sctp_src; |
613 | key->tp.dst = sctp_port_key->sctp_dst; | |
10f72e3d JS |
614 | } |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
fe90efd9 | 619 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port) |
064af421 | 620 | { |
fe90efd9 | 621 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
064af421 | 622 | |
fe90efd9 AZ |
623 | if (likely(vport)) |
624 | ovs_vport_send(vport, skb); | |
625 | else | |
f15c8639 | 626 | kfree_skb(skb); |
064af421 BP |
627 | } |
628 | ||
98403001 | 629 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, |
e74d4817 | 630 | struct sw_flow_key *key, const struct nlattr *attr) |
064af421 | 631 | { |
856081f6 | 632 | struct dp_upcall_info upcall; |
98403001 BP |
633 | const struct nlattr *a; |
634 | int rem; | |
8b7ea2d4 | 635 | struct ovs_tunnel_info info; |
856081f6 | 636 | |
df2c07f4 | 637 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
98403001 | 638 | upcall.userdata = NULL; |
28aea917 | 639 | upcall.portid = 0; |
8b7ea2d4 | 640 | upcall.egress_tun_info = NULL; |
98403001 BP |
641 | |
642 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
643 | a = nla_next(a, &rem)) { | |
644 | switch (nla_type(a)) { | |
645 | case OVS_USERSPACE_ATTR_USERDATA: | |
646 | upcall.userdata = a; | |
647 | break; | |
648 | ||
649 | case OVS_USERSPACE_ATTR_PID: | |
28aea917 | 650 | upcall.portid = nla_get_u32(a); |
98403001 | 651 | break; |
8b7ea2d4 WZ |
652 | |
653 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
654 | /* Get out tunnel info. */ | |
655 | struct vport *vport; | |
656 | ||
657 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
658 | if (vport) { | |
659 | int err; | |
660 | ||
661 | err = ovs_vport_get_egress_tun_info(vport, skb, | |
662 | &info); | |
663 | if (!err) | |
664 | upcall.egress_tun_info = &info; | |
665 | } | |
666 | break; | |
98403001 | 667 | } |
8b7ea2d4 WZ |
668 | |
669 | } /* End of switch. */ | |
98403001 BP |
670 | } |
671 | ||
e74d4817 | 672 | return ovs_dp_upcall(dp, skb, key, &upcall); |
064af421 BP |
673 | } |
674 | ||
fbf4f74d SH |
675 | static bool last_action(const struct nlattr *a, int rem) |
676 | { | |
677 | return a->nla_len == rem; | |
678 | } | |
679 | ||
6ff686f2 | 680 | static int sample(struct datapath *dp, struct sk_buff *skb, |
e74d4817 | 681 | struct sw_flow_key *key, const struct nlattr *attr) |
6ff686f2 PS |
682 | { |
683 | const struct nlattr *acts_list = NULL; | |
684 | const struct nlattr *a; | |
685 | int rem; | |
686 | ||
687 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
688 | a = nla_next(a, &rem)) { | |
689 | switch (nla_type(a)) { | |
690 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
e2f3178f | 691 | if (prandom_u32() >= nla_get_u32(a)) |
6ff686f2 PS |
692 | return 0; |
693 | break; | |
694 | ||
695 | case OVS_SAMPLE_ATTR_ACTIONS: | |
696 | acts_list = a; | |
697 | break; | |
698 | } | |
699 | } | |
700 | ||
fbf4f74d SH |
701 | rem = nla_len(acts_list); |
702 | a = nla_data(acts_list); | |
703 | ||
d7ff93d7 AZ |
704 | /* Actions list is empty, do nothing */ |
705 | if (unlikely(!rem)) | |
706 | return 0; | |
e16138e2 | 707 | |
d7ff93d7 AZ |
708 | /* The only known usage of sample action is having a single user-space |
709 | * action. Treat this usage as a special case. | |
710 | * The output_userspace() should clone the skb to be sent to the | |
e74d4817 PS |
711 | * user space. This skb will be consumed by its caller. |
712 | */ | |
d7ff93d7 AZ |
713 | if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE && |
714 | last_action(a, rem))) | |
e74d4817 | 715 | return output_userspace(dp, skb, key, a); |
d7ff93d7 AZ |
716 | |
717 | skb = skb_clone(skb, GFP_ATOMIC); | |
718 | if (!skb) | |
719 | /* Skip the sample action when out of memory. */ | |
720 | return 0; | |
721 | ||
e74d4817 | 722 | if (!add_deferred_actions(skb, key, a)) { |
2c8c4fb7 AZ |
723 | if (net_ratelimit()) |
724 | pr_warn("%s: deferred actions limit reached, dropping sample action\n", | |
725 | ovs_dp_name(dp)); | |
fbf4f74d | 726 | |
2c8c4fb7 AZ |
727 | kfree_skb(skb); |
728 | } | |
2c8c4fb7 | 729 | return 0; |
6ff686f2 PS |
730 | } |
731 | ||
e74d4817 PS |
732 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, |
733 | const struct nlattr *attr) | |
7804df20 | 734 | { |
7804df20 AZ |
735 | struct ovs_action_hash *hash_act = nla_data(attr); |
736 | u32 hash = 0; | |
737 | ||
738 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
e2f3178f | 739 | hash = skb_get_hash(skb); |
7804df20 AZ |
740 | hash = jhash_1word(hash, hash_act->hash_basis); |
741 | if (!hash) | |
742 | hash = 0x1; | |
743 | ||
744 | key->ovs_flow_hash = hash; | |
745 | } | |
746 | ||
e74d4817 | 747 | static int execute_set_action(struct sk_buff *skb, struct sw_flow_key *key, |
2c8c4fb7 | 748 | const struct nlattr *nested_attr) |
4edb9ae9 | 749 | { |
15c39847 | 750 | int err = 0; |
4edb9ae9 PS |
751 | |
752 | switch (nla_type(nested_attr)) { | |
abff858b PS |
753 | case OVS_KEY_ATTR_PRIORITY: |
754 | skb->priority = nla_get_u32(nested_attr); | |
e74d4817 | 755 | key->phy.priority = skb->priority; |
abff858b PS |
756 | break; |
757 | ||
72e8bf28 | 758 | case OVS_KEY_ATTR_SKB_MARK: |
3025a772 | 759 | skb->mark = nla_get_u32(nested_attr); |
e74d4817 | 760 | key->phy.skb_mark = skb->mark; |
72e8bf28 AA |
761 | break; |
762 | ||
f0cd669f | 763 | case OVS_KEY_ATTR_TUNNEL_INFO: |
fb66fbd1 | 764 | OVS_CB(skb)->egress_tun_info = nla_data(nested_attr); |
4edb9ae9 PS |
765 | break; |
766 | ||
767 | case OVS_KEY_ATTR_ETHERNET: | |
e74d4817 | 768 | err = set_eth_addr(skb, key, nla_data(nested_attr)); |
4edb9ae9 PS |
769 | break; |
770 | ||
771 | case OVS_KEY_ATTR_IPV4: | |
e74d4817 | 772 | err = set_ipv4(skb, key, nla_data(nested_attr)); |
4edb9ae9 PS |
773 | break; |
774 | ||
bc7a5acd | 775 | case OVS_KEY_ATTR_IPV6: |
e74d4817 | 776 | err = set_ipv6(skb, key, nla_data(nested_attr)); |
bc7a5acd AA |
777 | break; |
778 | ||
4edb9ae9 | 779 | case OVS_KEY_ATTR_TCP: |
e74d4817 | 780 | err = set_tcp(skb, key, nla_data(nested_attr)); |
4edb9ae9 PS |
781 | break; |
782 | ||
783 | case OVS_KEY_ATTR_UDP: | |
e74d4817 | 784 | err = set_udp(skb, key, nla_data(nested_attr)); |
4edb9ae9 | 785 | break; |
10f72e3d JS |
786 | |
787 | case OVS_KEY_ATTR_SCTP: | |
e74d4817 | 788 | err = set_sctp(skb, key, nla_data(nested_attr)); |
10f72e3d | 789 | break; |
ccf43786 SH |
790 | |
791 | case OVS_KEY_ATTR_MPLS: | |
e74d4817 | 792 | err = set_mpls(skb, key, nla_data(nested_attr)); |
ccf43786 | 793 | break; |
4edb9ae9 | 794 | } |
15c39847 | 795 | |
4edb9ae9 PS |
796 | return err; |
797 | } | |
798 | ||
a6059080 | 799 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
e74d4817 | 800 | struct sw_flow_key *key, const struct nlattr *a, int rem) |
a6059080 | 801 | { |
e74d4817 PS |
802 | struct deferred_action *da; |
803 | ||
804 | if (!is_flow_key_valid(key)) { | |
867e37ba AZ |
805 | int err; |
806 | ||
e74d4817 | 807 | err = ovs_flow_key_update(skb, key); |
867e37ba AZ |
808 | if (err) |
809 | return err; | |
810 | ||
811 | } | |
e74d4817 | 812 | BUG_ON(!is_flow_key_valid(key)); |
a6059080 | 813 | |
e16138e2 PS |
814 | if (!last_action(a, rem)) { |
815 | /* Recirc action is the not the last action | |
e74d4817 PS |
816 | * of the action list, need to clone the skb. |
817 | */ | |
e16138e2 PS |
818 | skb = skb_clone(skb, GFP_ATOMIC); |
819 | ||
820 | /* Skip the recirc action when out of memory, but | |
e74d4817 PS |
821 | * continue on with the rest of the action list. |
822 | */ | |
e16138e2 PS |
823 | if (!skb) |
824 | return 0; | |
2c8c4fb7 | 825 | } |
a6059080 | 826 | |
e74d4817 PS |
827 | da = add_deferred_actions(skb, key, NULL); |
828 | if (da) { | |
829 | da->pkt_key.recirc_id = nla_get_u32(a); | |
2c8c4fb7 AZ |
830 | } else { |
831 | kfree_skb(skb); | |
832 | ||
833 | if (net_ratelimit()) | |
834 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
835 | ovs_dp_name(dp)); | |
867e37ba | 836 | } |
a6059080 AZ |
837 | |
838 | return 0; | |
839 | } | |
840 | ||
064af421 | 841 | /* Execute a list of actions against 'skb'. */ |
871dfe07 | 842 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
e74d4817 PS |
843 | struct sw_flow_key *key, |
844 | const struct nlattr *attr, int len) | |
064af421 BP |
845 | { |
846 | /* Every output action needs a separate clone of 'skb', but the common | |
847 | * case is just a single output action, so that doing a clone and | |
848 | * then freeing the original skbuff is wasteful. So the following code | |
e74d4817 PS |
849 | * is slightly obscure just to avoid that. |
850 | */ | |
064af421 | 851 | int prev_port = -1; |
cdee00fd | 852 | const struct nlattr *a; |
10db8b20 | 853 | int rem; |
72b06300 | 854 | |
6ff686f2 | 855 | for (a = attr, rem = len; rem > 0; |
a4af2475 | 856 | a = nla_next(a, &rem)) { |
10db8b20 JG |
857 | int err = 0; |
858 | ||
fe90efd9 AZ |
859 | if (unlikely(prev_port != -1)) { |
860 | struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC); | |
861 | ||
862 | if (out_skb) | |
863 | do_output(dp, out_skb, prev_port); | |
864 | ||
064af421 BP |
865 | prev_port = -1; |
866 | } | |
867 | ||
cdee00fd | 868 | switch (nla_type(a)) { |
df2c07f4 | 869 | case OVS_ACTION_ATTR_OUTPUT: |
cdee00fd | 870 | prev_port = nla_get_u32(a); |
064af421 BP |
871 | break; |
872 | ||
df2c07f4 | 873 | case OVS_ACTION_ATTR_USERSPACE: |
e74d4817 | 874 | output_userspace(dp, skb, key, a); |
064af421 | 875 | break; |
7804df20 AZ |
876 | |
877 | case OVS_ACTION_ATTR_HASH: | |
e74d4817 | 878 | execute_hash(skb, key, a); |
7804df20 | 879 | break; |
064af421 | 880 | |
ccf43786 | 881 | case OVS_ACTION_ATTR_PUSH_MPLS: |
e74d4817 | 882 | err = push_mpls(skb, key, nla_data(a)); |
ccf43786 SH |
883 | break; |
884 | ||
885 | case OVS_ACTION_ATTR_POP_MPLS: | |
e74d4817 | 886 | err = pop_mpls(skb, key, nla_get_be16(a)); |
ccf43786 SH |
887 | break; |
888 | ||
fea393b1 | 889 | case OVS_ACTION_ATTR_PUSH_VLAN: |
e74d4817 | 890 | err = push_vlan(skb, key, nla_data(a)); |
4edb9ae9 | 891 | if (unlikely(err)) /* skb already freed. */ |
d9065a90 | 892 | return err; |
064af421 BP |
893 | break; |
894 | ||
fea393b1 | 895 | case OVS_ACTION_ATTR_POP_VLAN: |
e74d4817 | 896 | err = pop_vlan(skb, key); |
064af421 BP |
897 | break; |
898 | ||
e16138e2 | 899 | case OVS_ACTION_ATTR_RECIRC: |
e74d4817 | 900 | err = execute_recirc(dp, skb, key, a, rem); |
867e37ba AZ |
901 | if (last_action(a, rem)) { |
902 | /* If this is the last action, the skb has | |
903 | * been consumed or freed. | |
e74d4817 PS |
904 | * Return immediately. |
905 | */ | |
867e37ba AZ |
906 | return err; |
907 | } | |
a6059080 | 908 | break; |
a6059080 | 909 | |
4edb9ae9 | 910 | case OVS_ACTION_ATTR_SET: |
e74d4817 | 911 | err = execute_set_action(skb, key, nla_data(a)); |
064af421 | 912 | break; |
c1c9c9c4 | 913 | |
6ff686f2 | 914 | case OVS_ACTION_ATTR_SAMPLE: |
e74d4817 | 915 | err = sample(dp, skb, key, a); |
6ff686f2 | 916 | break; |
6ff686f2 | 917 | } |
15c39847 | 918 | |
10db8b20 JG |
919 | if (unlikely(err)) { |
920 | kfree_skb(skb); | |
921 | return err; | |
922 | } | |
064af421 | 923 | } |
6c222e55 | 924 | |
fbf4f74d | 925 | if (prev_port != -1) |
064af421 | 926 | do_output(dp, skb, prev_port); |
fbf4f74d | 927 | else |
5b95ab0e | 928 | consume_skb(skb); |
10db8b20 | 929 | |
a5225dd6 | 930 | return 0; |
064af421 | 931 | } |
871dfe07 | 932 | |
2c8c4fb7 AZ |
933 | static void process_deferred_actions(struct datapath *dp) |
934 | { | |
935 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
936 | ||
937 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
938 | if (action_fifo_is_empty(fifo)) | |
939 | return; | |
940 | ||
941 | /* Finishing executing all deferred actions. */ | |
942 | do { | |
943 | struct deferred_action *da = action_fifo_get(fifo); | |
944 | struct sk_buff *skb = da->skb; | |
945 | const struct nlattr *actions = da->actions; | |
946 | ||
947 | if (actions) | |
e74d4817 | 948 | do_execute_actions(dp, skb, &da->pkt_key, actions, |
2c8c4fb7 AZ |
949 | nla_len(actions)); |
950 | else | |
e74d4817 | 951 | ovs_dp_process_packet(skb, &da->pkt_key); |
2c8c4fb7 AZ |
952 | } while (!action_fifo_is_empty(fifo)); |
953 | ||
954 | /* Reset FIFO for the next packet. */ | |
955 | action_fifo_init(fifo); | |
956 | } | |
957 | ||
871dfe07 | 958 | /* Execute a list of actions against 'skb'. */ |
2c8c4fb7 | 959 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
f1f60b85 TG |
960 | struct sw_flow_key *key, |
961 | const struct sw_flow_actions *acts) | |
2c8c4fb7 AZ |
962 | { |
963 | int level = this_cpu_read(exec_actions_level); | |
964 | int err; | |
965 | ||
966 | if (unlikely(level >= EXEC_ACTIONS_LEVEL_LIMIT)) { | |
967 | if (net_ratelimit()) | |
968 | pr_warn("%s: packet loop detected, dropping.\n", | |
969 | ovs_dp_name(dp)); | |
970 | ||
971 | kfree_skb(skb); | |
972 | return -ELOOP; | |
973 | } | |
974 | ||
975 | this_cpu_inc(exec_actions_level); | |
976 | ||
e74d4817 | 977 | err = do_execute_actions(dp, skb, key, acts->actions, acts->actions_len); |
2c8c4fb7 AZ |
978 | |
979 | if (!level) | |
980 | process_deferred_actions(dp); | |
981 | ||
982 | this_cpu_dec(exec_actions_level); | |
983 | ||
984 | /* This return status currently does not reflect the errors | |
985 | * encounted during deferred actions execution. Probably needs to | |
e74d4817 PS |
986 | * be fixed in the future. |
987 | */ | |
2c8c4fb7 AZ |
988 | return err; |
989 | } | |
990 | ||
991 | int action_fifos_init(void) | |
992 | { | |
993 | action_fifos = alloc_percpu(struct action_fifo); | |
994 | if (!action_fifos) | |
995 | return -ENOMEM; | |
996 | ||
997 | return 0; | |
998 | } | |
999 | ||
1000 | void action_fifos_exit(void) | |
60759b2b | 1001 | { |
2c8c4fb7 | 1002 | free_percpu(action_fifos); |
871dfe07 | 1003 | } |