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Commit | Line | Data |
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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> |
2baf0e0c | 35 | #include <net/mpls.h> |
10f72e3d | 36 | #include <net/sctp/checksum.h> |
f2459fe7 | 37 | |
f2459fe7 | 38 | #include "datapath.h" |
ccf43786 | 39 | #include "gso.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 | ||
e74d4817 | 125 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
ccf43786 SH |
126 | const struct ovs_action_push_mpls *mpls) |
127 | { | |
128 | __be32 *new_mpls_lse; | |
129 | struct ethhdr *hdr; | |
130 | ||
2baf0e0c PS |
131 | /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */ |
132 | if (skb_encapsulation(skb)) | |
133 | return -ENOTSUPP; | |
134 | ||
ccf43786 SH |
135 | if (skb_cow_head(skb, MPLS_HLEN) < 0) |
136 | return -ENOMEM; | |
137 | ||
138 | skb_push(skb, MPLS_HLEN); | |
139 | memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb), | |
140 | skb->mac_len); | |
141 | skb_reset_mac_header(skb); | |
142 | ||
2baf0e0c | 143 | new_mpls_lse = (__be32 *)skb_mpls_header(skb); |
ccf43786 SH |
144 | *new_mpls_lse = mpls->mpls_lse; |
145 | ||
146 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
147 | skb->csum = csum_add(skb->csum, csum_partial(new_mpls_lse, | |
148 | MPLS_HLEN, 0)); | |
149 | ||
150 | hdr = eth_hdr(skb); | |
151 | hdr->h_proto = mpls->mpls_ethertype; | |
152 | if (!ovs_skb_get_inner_protocol(skb)) | |
153 | ovs_skb_set_inner_protocol(skb, skb->protocol); | |
154 | skb->protocol = mpls->mpls_ethertype; | |
2baf0e0c | 155 | |
e74d4817 | 156 | invalidate_flow_key(key); |
ccf43786 SH |
157 | return 0; |
158 | } | |
159 | ||
e74d4817 PS |
160 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
161 | const __be16 ethertype) | |
ccf43786 SH |
162 | { |
163 | struct ethhdr *hdr; | |
164 | int err; | |
165 | ||
5cce04b6 | 166 | err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); |
ccf43786 SH |
167 | if (unlikely(err)) |
168 | return err; | |
169 | ||
170 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
171 | skb->csum = csum_sub(skb->csum, | |
2baf0e0c | 172 | csum_partial(skb_mpls_header(skb), |
ccf43786 SH |
173 | MPLS_HLEN, 0)); |
174 | ||
175 | memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), | |
176 | skb->mac_len); | |
177 | ||
178 | __skb_pull(skb, MPLS_HLEN); | |
179 | skb_reset_mac_header(skb); | |
180 | ||
2baf0e0c | 181 | /* skb_mpls_header() is used to locate the ethertype |
ccf43786 SH |
182 | * field correctly in the presence of VLAN tags. |
183 | */ | |
2baf0e0c | 184 | hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN); |
ccf43786 SH |
185 | hdr->h_proto = ethertype; |
186 | if (eth_p_mpls(skb->protocol)) | |
187 | skb->protocol = ethertype; | |
2baf0e0c | 188 | |
e74d4817 | 189 | invalidate_flow_key(key); |
ccf43786 SH |
190 | return 0; |
191 | } | |
192 | ||
e74d4817 PS |
193 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
194 | const __be32 *mpls_lse) | |
ccf43786 | 195 | { |
2baf0e0c | 196 | __be32 *stack; |
ccf43786 SH |
197 | int err; |
198 | ||
5cce04b6 | 199 | err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); |
ccf43786 SH |
200 | if (unlikely(err)) |
201 | return err; | |
202 | ||
2baf0e0c | 203 | stack = (__be32 *)skb_mpls_header(skb); |
ccf43786 SH |
204 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
205 | __be32 diff[] = { ~(*stack), *mpls_lse }; | |
206 | skb->csum = ~csum_partial((char *)diff, sizeof(diff), | |
207 | ~skb->csum); | |
208 | } | |
209 | ||
210 | *stack = *mpls_lse; | |
e74d4817 | 211 | key->mpls.top_lse = *mpls_lse; |
ccf43786 SH |
212 | return 0; |
213 | } | |
214 | ||
b2492cb7 | 215 | /* remove VLAN header from packet and update csum accordingly. */ |
d9065a90 | 216 | static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci) |
064af421 | 217 | { |
ceb176fd | 218 | struct vlan_hdr *vhdr; |
10db8b20 | 219 | int err; |
064af421 | 220 | |
5cce04b6 | 221 | err = skb_ensure_writable(skb, VLAN_ETH_HLEN); |
10db8b20 JG |
222 | if (unlikely(err)) |
223 | return err; | |
6ce39213 | 224 | |
237c4f2a | 225 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
635c9298 | 226 | skb->csum = csum_sub(skb->csum, csum_partial(skb->data |
af9d14a8 | 227 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
635c9298 | 228 | |
ceb176fd PS |
229 | vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN); |
230 | *current_tci = vhdr->h_vlan_TCI; | |
d9065a90 | 231 | |
6ce39213 | 232 | memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); |
ceb176fd | 233 | __skb_pull(skb, VLAN_HLEN); |
064af421 | 234 | |
ceb176fd | 235 | vlan_set_encap_proto(skb, vhdr); |
064af421 | 236 | skb->mac_header += VLAN_HLEN; |
ccf43786 SH |
237 | /* Update mac_len for subsequent MPLS actions */ |
238 | skb->mac_len -= VLAN_HLEN; | |
064af421 | 239 | |
10db8b20 | 240 | return 0; |
064af421 BP |
241 | } |
242 | ||
e74d4817 | 243 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 244 | { |
d9065a90 PS |
245 | __be16 tci; |
246 | int err; | |
10db8b20 | 247 | |
d9065a90 PS |
248 | if (likely(vlan_tx_tag_present(skb))) { |
249 | vlan_set_tci(skb, 0); | |
250 | } else { | |
251 | if (unlikely(skb->protocol != htons(ETH_P_8021Q) || | |
fb516ed8 | 252 | skb->len < VLAN_ETH_HLEN)) |
10db8b20 | 253 | return 0; |
064af421 | 254 | |
d9065a90 PS |
255 | err = __pop_vlan_tci(skb, &tci); |
256 | if (err) | |
10db8b20 | 257 | return err; |
064af421 | 258 | } |
d9065a90 PS |
259 | /* move next vlan tag to hw accel tag */ |
260 | if (likely(skb->protocol != htons(ETH_P_8021Q) || | |
e16138e2 | 261 | skb->len < VLAN_ETH_HLEN)) { |
e74d4817 | 262 | key->eth.tci = 0; |
d9065a90 | 263 | return 0; |
e16138e2 | 264 | } |
d9065a90 | 265 | |
e74d4817 | 266 | invalidate_flow_key(key); |
d9065a90 PS |
267 | err = __pop_vlan_tci(skb, &tci); |
268 | if (unlikely(err)) | |
269 | return err; | |
064af421 | 270 | |
9b764edf | 271 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci)); |
d9065a90 PS |
272 | return 0; |
273 | } | |
274 | ||
e74d4817 PS |
275 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
276 | const struct ovs_action_push_vlan *vlan) | |
d9065a90 PS |
277 | { |
278 | if (unlikely(vlan_tx_tag_present(skb))) { | |
279 | u16 current_tag; | |
280 | ||
281 | /* push down current VLAN tag */ | |
282 | current_tag = vlan_tx_tag_get(skb); | |
283 | ||
1f649f1c | 284 | if (!vlan_insert_tag_set_proto(skb, skb->vlan_proto, current_tag)) |
d9065a90 | 285 | return -ENOMEM; |
ccf43786 SH |
286 | /* Update mac_len for subsequent MPLS actions */ |
287 | skb->mac_len += VLAN_HLEN; | |
288 | ||
237c4f2a | 289 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
d9065a90 | 290 | skb->csum = csum_add(skb->csum, csum_partial(skb->data |
af9d14a8 | 291 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
d9065a90 | 292 | |
e74d4817 | 293 | invalidate_flow_key(key); |
e16138e2 | 294 | } else { |
e74d4817 | 295 | key->eth.tci = vlan->vlan_tci; |
d9065a90 | 296 | } |
9b764edf | 297 | __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); |
10db8b20 | 298 | return 0; |
064af421 BP |
299 | } |
300 | ||
e74d4817 | 301 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *key, |
4edb9ae9 | 302 | const struct ovs_key_ethernet *eth_key) |
ca78c6b6 | 303 | { |
4edb9ae9 | 304 | int err; |
5cce04b6 | 305 | err = skb_ensure_writable(skb, ETH_HLEN); |
4edb9ae9 PS |
306 | if (unlikely(err)) |
307 | return err; | |
308 | ||
237c4f2a | 309 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 310 | |
982a47ec JP |
311 | ether_addr_copy(eth_hdr(skb)->h_source, eth_key->eth_src); |
312 | ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst); | |
4edb9ae9 | 313 | |
237c4f2a | 314 | ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 315 | |
e74d4817 PS |
316 | ether_addr_copy(key->eth.src, eth_key->eth_src); |
317 | ether_addr_copy(key->eth.dst, eth_key->eth_dst); | |
4edb9ae9 | 318 | return 0; |
ca78c6b6 BP |
319 | } |
320 | ||
4edb9ae9 | 321 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
e16138e2 | 322 | __be32 *addr, __be32 new_addr) |
ca78c6b6 BP |
323 | { |
324 | int transport_len = skb->len - skb_transport_offset(skb); | |
4edb9ae9 PS |
325 | |
326 | if (nh->protocol == IPPROTO_TCP) { | |
ca78c6b6 | 327 | if (likely(transport_len >= sizeof(struct tcphdr))) |
4edb9ae9 PS |
328 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, |
329 | *addr, new_addr, 1); | |
330 | } else if (nh->protocol == IPPROTO_UDP) { | |
55ce87bc JG |
331 | if (likely(transport_len >= sizeof(struct udphdr))) { |
332 | struct udphdr *uh = udp_hdr(skb); | |
333 | ||
237c4f2a | 334 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
55ce87bc JG |
335 | inet_proto_csum_replace4(&uh->check, skb, |
336 | *addr, new_addr, 1); | |
337 | if (!uh->check) | |
338 | uh->check = CSUM_MANGLED_0; | |
339 | } | |
340 | } | |
ca78c6b6 | 341 | } |
4edb9ae9 PS |
342 | |
343 | csum_replace4(&nh->check, *addr, new_addr); | |
e2f3178f | 344 | skb_clear_hash(skb); |
4edb9ae9 | 345 | *addr = new_addr; |
ca78c6b6 BP |
346 | } |
347 | ||
bc7a5acd AA |
348 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
349 | __be32 addr[4], const __be32 new_addr[4]) | |
350 | { | |
351 | int transport_len = skb->len - skb_transport_offset(skb); | |
352 | ||
00894212 | 353 | if (l4_proto == NEXTHDR_TCP) { |
bc7a5acd AA |
354 | if (likely(transport_len >= sizeof(struct tcphdr))) |
355 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
356 | addr, new_addr, 1); | |
00894212 | 357 | } else if (l4_proto == NEXTHDR_UDP) { |
bc7a5acd AA |
358 | if (likely(transport_len >= sizeof(struct udphdr))) { |
359 | struct udphdr *uh = udp_hdr(skb); | |
360 | ||
237c4f2a | 361 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
bc7a5acd AA |
362 | inet_proto_csum_replace16(&uh->check, skb, |
363 | addr, new_addr, 1); | |
364 | if (!uh->check) | |
365 | uh->check = CSUM_MANGLED_0; | |
366 | } | |
367 | } | |
00894212 JG |
368 | } else if (l4_proto == NEXTHDR_ICMP) { |
369 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
370 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
371 | skb, addr, new_addr, 1); | |
bc7a5acd AA |
372 | } |
373 | } | |
374 | ||
375 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, | |
376 | __be32 addr[4], const __be32 new_addr[4], | |
377 | bool recalculate_csum) | |
378 | { | |
51cf5e71 | 379 | if (likely(recalculate_csum)) |
bc7a5acd AA |
380 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); |
381 | ||
e2f3178f | 382 | skb_clear_hash(skb); |
bc7a5acd AA |
383 | memcpy(addr, new_addr, sizeof(__be32[4])); |
384 | } | |
385 | ||
386 | static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc) | |
387 | { | |
388 | nh->priority = tc >> 4; | |
389 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4); | |
390 | } | |
391 | ||
392 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl) | |
393 | { | |
394 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16; | |
395 | nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8; | |
396 | nh->flow_lbl[2] = fl & 0x000000FF; | |
397 | } | |
398 | ||
a61680c6 JP |
399 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl) |
400 | { | |
401 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); | |
402 | nh->ttl = new_ttl; | |
403 | } | |
404 | ||
e74d4817 PS |
405 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *key, |
406 | const struct ovs_key_ipv4 *ipv4_key) | |
064af421 | 407 | { |
ca78c6b6 | 408 | struct iphdr *nh; |
10db8b20 | 409 | int err; |
ca78c6b6 | 410 | |
5cce04b6 TG |
411 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
412 | sizeof(struct iphdr)); | |
10db8b20 JG |
413 | if (unlikely(err)) |
414 | return err; | |
ca78c6b6 BP |
415 | |
416 | nh = ip_hdr(skb); | |
ca78c6b6 | 417 | |
e16138e2 | 418 | if (ipv4_key->ipv4_src != nh->saddr) { |
4edb9ae9 | 419 | set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src); |
e74d4817 | 420 | key->ipv4.addr.src = ipv4_key->ipv4_src; |
e16138e2 | 421 | } |
ca78c6b6 | 422 | |
e16138e2 | 423 | if (ipv4_key->ipv4_dst != nh->daddr) { |
4edb9ae9 | 424 | set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst); |
e74d4817 | 425 | key->ipv4.addr.dst = ipv4_key->ipv4_dst; |
e16138e2 | 426 | } |
a4a26436 | 427 | |
e16138e2 | 428 | if (ipv4_key->ipv4_tos != nh->tos) { |
530180fd | 429 | ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos); |
e74d4817 | 430 | key->ip.tos = nh->tos; |
e16138e2 | 431 | } |
ca78c6b6 | 432 | |
e16138e2 | 433 | if (ipv4_key->ipv4_ttl != nh->ttl) { |
a61680c6 | 434 | set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl); |
e74d4817 | 435 | key->ip.ttl = ipv4_key->ipv4_ttl; |
e16138e2 | 436 | } |
a61680c6 | 437 | |
10db8b20 | 438 | return 0; |
064af421 BP |
439 | } |
440 | ||
e74d4817 PS |
441 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *key, |
442 | const struct ovs_key_ipv6 *ipv6_key) | |
bc7a5acd AA |
443 | { |
444 | struct ipv6hdr *nh; | |
445 | int err; | |
446 | __be32 *saddr; | |
447 | __be32 *daddr; | |
448 | ||
5cce04b6 TG |
449 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
450 | sizeof(struct ipv6hdr)); | |
bc7a5acd AA |
451 | if (unlikely(err)) |
452 | return err; | |
453 | ||
454 | nh = ipv6_hdr(skb); | |
455 | saddr = (__be32 *)&nh->saddr; | |
456 | daddr = (__be32 *)&nh->daddr; | |
457 | ||
e16138e2 | 458 | if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) { |
bc7a5acd AA |
459 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr, |
460 | ipv6_key->ipv6_src, true); | |
e74d4817 PS |
461 | memcpy(&key->ipv6.addr.src, ipv6_key->ipv6_src, |
462 | sizeof(ipv6_key->ipv6_src)); | |
e16138e2 | 463 | } |
bc7a5acd AA |
464 | |
465 | if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) { | |
466 | unsigned int offset = 0; | |
8abaa53c | 467 | int flags = IP6_FH_F_SKIP_RH; |
bc7a5acd AA |
468 | bool recalc_csum = true; |
469 | ||
470 | if (ipv6_ext_hdr(nh->nexthdr)) | |
471 | recalc_csum = ipv6_find_hdr(skb, &offset, | |
472 | NEXTHDR_ROUTING, NULL, | |
473 | &flags) != NEXTHDR_ROUTING; | |
474 | ||
475 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr, | |
476 | ipv6_key->ipv6_dst, recalc_csum); | |
e74d4817 PS |
477 | memcpy(&key->ipv6.addr.dst, ipv6_key->ipv6_dst, |
478 | sizeof(ipv6_key->ipv6_dst)); | |
bc7a5acd AA |
479 | } |
480 | ||
481 | set_ipv6_tc(nh, ipv6_key->ipv6_tclass); | |
e74d4817 | 482 | key->ip.tos = ipv6_get_dsfield(nh); |
e16138e2 | 483 | |
bc7a5acd | 484 | set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label)); |
e74d4817 | 485 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); |
bc7a5acd | 486 | |
e16138e2 | 487 | nh->hop_limit = ipv6_key->ipv6_hlimit; |
e74d4817 | 488 | key->ip.ttl = ipv6_key->ipv6_hlimit; |
bc7a5acd AA |
489 | return 0; |
490 | } | |
491 | ||
5cce04b6 | 492 | /* Must follow skb_ensure_writable() since that can move the skb data. */ |
4edb9ae9 PS |
493 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
494 | __be16 new_port, __sum16 *check) | |
959a2ecd | 495 | { |
4edb9ae9 PS |
496 | inet_proto_csum_replace2(check, skb, *port, new_port, 0); |
497 | *port = new_port; | |
e2f3178f | 498 | skb_clear_hash(skb); |
4edb9ae9 | 499 | } |
10db8b20 | 500 | |
55ce87bc JG |
501 | static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port) |
502 | { | |
503 | struct udphdr *uh = udp_hdr(skb); | |
504 | ||
237c4f2a | 505 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
55ce87bc JG |
506 | set_tp_port(skb, port, new_port, &uh->check); |
507 | ||
508 | if (!uh->check) | |
509 | uh->check = CSUM_MANGLED_0; | |
510 | } else { | |
511 | *port = new_port; | |
e2f3178f | 512 | skb_clear_hash(skb); |
55ce87bc JG |
513 | } |
514 | } | |
515 | ||
e74d4817 PS |
516 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *key, |
517 | const struct ovs_key_udp *udp_port_key) | |
4edb9ae9 PS |
518 | { |
519 | struct udphdr *uh; | |
520 | int err; | |
10db8b20 | 521 | |
5cce04b6 TG |
522 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
523 | sizeof(struct udphdr)); | |
10db8b20 JG |
524 | if (unlikely(err)) |
525 | return err; | |
526 | ||
4edb9ae9 | 527 | uh = udp_hdr(skb); |
e16138e2 | 528 | if (udp_port_key->udp_src != uh->source) { |
55ce87bc | 529 | set_udp_port(skb, &uh->source, udp_port_key->udp_src); |
e74d4817 | 530 | key->tp.src = udp_port_key->udp_src; |
e16138e2 | 531 | } |
4edb9ae9 | 532 | |
e16138e2 | 533 | if (udp_port_key->udp_dst != uh->dest) { |
55ce87bc | 534 | set_udp_port(skb, &uh->dest, udp_port_key->udp_dst); |
e74d4817 | 535 | key->tp.dst = udp_port_key->udp_dst; |
e16138e2 | 536 | } |
10db8b20 JG |
537 | |
538 | return 0; | |
959a2ecd JP |
539 | } |
540 | ||
e74d4817 PS |
541 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *key, |
542 | const struct ovs_key_tcp *tcp_port_key) | |
064af421 | 543 | { |
4edb9ae9 | 544 | struct tcphdr *th; |
10db8b20 | 545 | int err; |
064af421 | 546 | |
5cce04b6 TG |
547 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
548 | sizeof(struct tcphdr)); | |
10db8b20 JG |
549 | if (unlikely(err)) |
550 | return err; | |
ca78c6b6 | 551 | |
4edb9ae9 | 552 | th = tcp_hdr(skb); |
e16138e2 | 553 | if (tcp_port_key->tcp_src != th->source) { |
4edb9ae9 | 554 | set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check); |
e74d4817 | 555 | key->tp.src = tcp_port_key->tcp_src; |
e16138e2 | 556 | } |
064af421 | 557 | |
e16138e2 | 558 | if (tcp_port_key->tcp_dst != th->dest) { |
4edb9ae9 | 559 | set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check); |
e74d4817 | 560 | key->tp.dst = tcp_port_key->tcp_dst; |
e16138e2 | 561 | } |
ca78c6b6 | 562 | |
10db8b20 | 563 | return 0; |
064af421 BP |
564 | } |
565 | ||
e74d4817 | 566 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *key, |
e16138e2 | 567 | const struct ovs_key_sctp *sctp_port_key) |
10f72e3d JS |
568 | { |
569 | struct sctphdr *sh; | |
570 | int err; | |
571 | unsigned int sctphoff = skb_transport_offset(skb); | |
572 | ||
5cce04b6 | 573 | err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr)); |
10f72e3d JS |
574 | if (unlikely(err)) |
575 | return err; | |
576 | ||
577 | sh = sctp_hdr(skb); | |
578 | if (sctp_port_key->sctp_src != sh->source || | |
579 | sctp_port_key->sctp_dst != sh->dest) { | |
580 | __le32 old_correct_csum, new_csum, old_csum; | |
581 | ||
582 | old_csum = sh->checksum; | |
583 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
584 | ||
585 | sh->source = sctp_port_key->sctp_src; | |
586 | sh->dest = sctp_port_key->sctp_dst; | |
587 | ||
588 | new_csum = sctp_compute_cksum(skb, sctphoff); | |
589 | ||
590 | /* Carry any checksum errors through. */ | |
591 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
592 | ||
e2f3178f | 593 | skb_clear_hash(skb); |
e74d4817 PS |
594 | key->tp.src = sctp_port_key->sctp_src; |
595 | key->tp.dst = sctp_port_key->sctp_dst; | |
10f72e3d JS |
596 | } |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
fe90efd9 | 601 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port) |
064af421 | 602 | { |
fe90efd9 | 603 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
064af421 | 604 | |
fe90efd9 AZ |
605 | if (likely(vport)) |
606 | ovs_vport_send(vport, skb); | |
607 | else | |
f15c8639 | 608 | kfree_skb(skb); |
064af421 BP |
609 | } |
610 | ||
98403001 | 611 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, |
e74d4817 | 612 | struct sw_flow_key *key, const struct nlattr *attr) |
064af421 | 613 | { |
2baf0e0c | 614 | struct ovs_tunnel_info info; |
856081f6 | 615 | struct dp_upcall_info upcall; |
98403001 BP |
616 | const struct nlattr *a; |
617 | int rem; | |
856081f6 | 618 | |
df2c07f4 | 619 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
98403001 | 620 | upcall.userdata = NULL; |
28aea917 | 621 | upcall.portid = 0; |
8b7ea2d4 | 622 | upcall.egress_tun_info = NULL; |
98403001 BP |
623 | |
624 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
625 | a = nla_next(a, &rem)) { | |
626 | switch (nla_type(a)) { | |
627 | case OVS_USERSPACE_ATTR_USERDATA: | |
628 | upcall.userdata = a; | |
629 | break; | |
630 | ||
631 | case OVS_USERSPACE_ATTR_PID: | |
28aea917 | 632 | upcall.portid = nla_get_u32(a); |
98403001 | 633 | break; |
8b7ea2d4 WZ |
634 | |
635 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
636 | /* Get out tunnel info. */ | |
637 | struct vport *vport; | |
638 | ||
639 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
640 | if (vport) { | |
641 | int err; | |
642 | ||
643 | err = ovs_vport_get_egress_tun_info(vport, skb, | |
644 | &info); | |
645 | if (!err) | |
646 | upcall.egress_tun_info = &info; | |
647 | } | |
648 | break; | |
98403001 | 649 | } |
8b7ea2d4 WZ |
650 | |
651 | } /* End of switch. */ | |
98403001 BP |
652 | } |
653 | ||
e74d4817 | 654 | return ovs_dp_upcall(dp, skb, key, &upcall); |
064af421 BP |
655 | } |
656 | ||
6ff686f2 | 657 | static int sample(struct datapath *dp, struct sk_buff *skb, |
e74d4817 | 658 | struct sw_flow_key *key, const struct nlattr *attr) |
6ff686f2 PS |
659 | { |
660 | const struct nlattr *acts_list = NULL; | |
661 | const struct nlattr *a; | |
662 | int rem; | |
663 | ||
664 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
665 | a = nla_next(a, &rem)) { | |
666 | switch (nla_type(a)) { | |
667 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
e2f3178f | 668 | if (prandom_u32() >= nla_get_u32(a)) |
6ff686f2 PS |
669 | return 0; |
670 | break; | |
671 | ||
672 | case OVS_SAMPLE_ATTR_ACTIONS: | |
673 | acts_list = a; | |
674 | break; | |
675 | } | |
676 | } | |
677 | ||
fbf4f74d SH |
678 | rem = nla_len(acts_list); |
679 | a = nla_data(acts_list); | |
680 | ||
d7ff93d7 AZ |
681 | /* Actions list is empty, do nothing */ |
682 | if (unlikely(!rem)) | |
683 | return 0; | |
e16138e2 | 684 | |
d7ff93d7 AZ |
685 | /* The only known usage of sample action is having a single user-space |
686 | * action. Treat this usage as a special case. | |
687 | * The output_userspace() should clone the skb to be sent to the | |
e74d4817 PS |
688 | * user space. This skb will be consumed by its caller. |
689 | */ | |
d7ff93d7 | 690 | if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE && |
684b5f5d | 691 | nla_is_last(a, rem))) |
e74d4817 | 692 | return output_userspace(dp, skb, key, a); |
d7ff93d7 AZ |
693 | |
694 | skb = skb_clone(skb, GFP_ATOMIC); | |
695 | if (!skb) | |
696 | /* Skip the sample action when out of memory. */ | |
697 | return 0; | |
698 | ||
e74d4817 | 699 | if (!add_deferred_actions(skb, key, a)) { |
2c8c4fb7 AZ |
700 | if (net_ratelimit()) |
701 | pr_warn("%s: deferred actions limit reached, dropping sample action\n", | |
702 | ovs_dp_name(dp)); | |
fbf4f74d | 703 | |
2c8c4fb7 AZ |
704 | kfree_skb(skb); |
705 | } | |
2c8c4fb7 | 706 | return 0; |
6ff686f2 PS |
707 | } |
708 | ||
e74d4817 PS |
709 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, |
710 | const struct nlattr *attr) | |
7804df20 | 711 | { |
7804df20 AZ |
712 | struct ovs_action_hash *hash_act = nla_data(attr); |
713 | u32 hash = 0; | |
714 | ||
715 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
e2f3178f | 716 | hash = skb_get_hash(skb); |
7804df20 AZ |
717 | hash = jhash_1word(hash, hash_act->hash_basis); |
718 | if (!hash) | |
719 | hash = 0x1; | |
720 | ||
721 | key->ovs_flow_hash = hash; | |
722 | } | |
723 | ||
e74d4817 | 724 | static int execute_set_action(struct sk_buff *skb, struct sw_flow_key *key, |
2c8c4fb7 | 725 | const struct nlattr *nested_attr) |
4edb9ae9 | 726 | { |
15c39847 | 727 | int err = 0; |
4edb9ae9 PS |
728 | |
729 | switch (nla_type(nested_attr)) { | |
abff858b PS |
730 | case OVS_KEY_ATTR_PRIORITY: |
731 | skb->priority = nla_get_u32(nested_attr); | |
e74d4817 | 732 | key->phy.priority = skb->priority; |
abff858b PS |
733 | break; |
734 | ||
72e8bf28 | 735 | case OVS_KEY_ATTR_SKB_MARK: |
3025a772 | 736 | skb->mark = nla_get_u32(nested_attr); |
e74d4817 | 737 | key->phy.skb_mark = skb->mark; |
72e8bf28 AA |
738 | break; |
739 | ||
f0cd669f | 740 | case OVS_KEY_ATTR_TUNNEL_INFO: |
fb66fbd1 | 741 | OVS_CB(skb)->egress_tun_info = nla_data(nested_attr); |
4edb9ae9 PS |
742 | break; |
743 | ||
744 | case OVS_KEY_ATTR_ETHERNET: | |
e74d4817 | 745 | err = set_eth_addr(skb, key, nla_data(nested_attr)); |
4edb9ae9 PS |
746 | break; |
747 | ||
748 | case OVS_KEY_ATTR_IPV4: | |
e74d4817 | 749 | err = set_ipv4(skb, key, nla_data(nested_attr)); |
4edb9ae9 PS |
750 | break; |
751 | ||
bc7a5acd | 752 | case OVS_KEY_ATTR_IPV6: |
e74d4817 | 753 | err = set_ipv6(skb, key, nla_data(nested_attr)); |
bc7a5acd AA |
754 | break; |
755 | ||
4edb9ae9 | 756 | case OVS_KEY_ATTR_TCP: |
e74d4817 | 757 | err = set_tcp(skb, key, nla_data(nested_attr)); |
4edb9ae9 PS |
758 | break; |
759 | ||
760 | case OVS_KEY_ATTR_UDP: | |
e74d4817 | 761 | err = set_udp(skb, key, nla_data(nested_attr)); |
4edb9ae9 | 762 | break; |
10f72e3d JS |
763 | |
764 | case OVS_KEY_ATTR_SCTP: | |
e74d4817 | 765 | err = set_sctp(skb, key, nla_data(nested_attr)); |
10f72e3d | 766 | break; |
ccf43786 SH |
767 | |
768 | case OVS_KEY_ATTR_MPLS: | |
e74d4817 | 769 | err = set_mpls(skb, key, nla_data(nested_attr)); |
ccf43786 | 770 | break; |
4edb9ae9 | 771 | } |
15c39847 | 772 | |
4edb9ae9 PS |
773 | return err; |
774 | } | |
775 | ||
a6059080 | 776 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
7d16c847 PS |
777 | struct sw_flow_key *key, |
778 | const struct nlattr *a, int rem) | |
a6059080 | 779 | { |
e74d4817 PS |
780 | struct deferred_action *da; |
781 | ||
782 | if (!is_flow_key_valid(key)) { | |
867e37ba AZ |
783 | int err; |
784 | ||
e74d4817 | 785 | err = ovs_flow_key_update(skb, key); |
867e37ba AZ |
786 | if (err) |
787 | return err; | |
867e37ba | 788 | } |
e74d4817 | 789 | BUG_ON(!is_flow_key_valid(key)); |
a6059080 | 790 | |
684b5f5d | 791 | if (!nla_is_last(a, rem)) { |
e16138e2 | 792 | /* Recirc action is the not the last action |
e74d4817 PS |
793 | * of the action list, need to clone the skb. |
794 | */ | |
e16138e2 PS |
795 | skb = skb_clone(skb, GFP_ATOMIC); |
796 | ||
797 | /* Skip the recirc action when out of memory, but | |
e74d4817 PS |
798 | * continue on with the rest of the action list. |
799 | */ | |
e16138e2 PS |
800 | if (!skb) |
801 | return 0; | |
2c8c4fb7 | 802 | } |
a6059080 | 803 | |
e74d4817 PS |
804 | da = add_deferred_actions(skb, key, NULL); |
805 | if (da) { | |
806 | da->pkt_key.recirc_id = nla_get_u32(a); | |
2c8c4fb7 AZ |
807 | } else { |
808 | kfree_skb(skb); | |
809 | ||
810 | if (net_ratelimit()) | |
811 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
812 | ovs_dp_name(dp)); | |
867e37ba | 813 | } |
a6059080 AZ |
814 | |
815 | return 0; | |
816 | } | |
817 | ||
064af421 | 818 | /* Execute a list of actions against 'skb'. */ |
871dfe07 | 819 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
e74d4817 PS |
820 | struct sw_flow_key *key, |
821 | const struct nlattr *attr, int len) | |
064af421 BP |
822 | { |
823 | /* Every output action needs a separate clone of 'skb', but the common | |
824 | * case is just a single output action, so that doing a clone and | |
825 | * then freeing the original skbuff is wasteful. So the following code | |
e74d4817 PS |
826 | * is slightly obscure just to avoid that. |
827 | */ | |
064af421 | 828 | int prev_port = -1; |
cdee00fd | 829 | const struct nlattr *a; |
10db8b20 | 830 | int rem; |
72b06300 | 831 | |
6ff686f2 | 832 | for (a = attr, rem = len; rem > 0; |
a4af2475 | 833 | a = nla_next(a, &rem)) { |
10db8b20 JG |
834 | int err = 0; |
835 | ||
fe90efd9 AZ |
836 | if (unlikely(prev_port != -1)) { |
837 | struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC); | |
838 | ||
839 | if (out_skb) | |
840 | do_output(dp, out_skb, prev_port); | |
841 | ||
064af421 BP |
842 | prev_port = -1; |
843 | } | |
844 | ||
cdee00fd | 845 | switch (nla_type(a)) { |
df2c07f4 | 846 | case OVS_ACTION_ATTR_OUTPUT: |
cdee00fd | 847 | prev_port = nla_get_u32(a); |
064af421 BP |
848 | break; |
849 | ||
df2c07f4 | 850 | case OVS_ACTION_ATTR_USERSPACE: |
e74d4817 | 851 | output_userspace(dp, skb, key, a); |
064af421 | 852 | break; |
7804df20 AZ |
853 | |
854 | case OVS_ACTION_ATTR_HASH: | |
e74d4817 | 855 | execute_hash(skb, key, a); |
7804df20 | 856 | break; |
064af421 | 857 | |
ccf43786 | 858 | case OVS_ACTION_ATTR_PUSH_MPLS: |
e74d4817 | 859 | err = push_mpls(skb, key, nla_data(a)); |
ccf43786 SH |
860 | break; |
861 | ||
862 | case OVS_ACTION_ATTR_POP_MPLS: | |
e74d4817 | 863 | err = pop_mpls(skb, key, nla_get_be16(a)); |
ccf43786 SH |
864 | break; |
865 | ||
fea393b1 | 866 | case OVS_ACTION_ATTR_PUSH_VLAN: |
e74d4817 | 867 | err = push_vlan(skb, key, nla_data(a)); |
4edb9ae9 | 868 | if (unlikely(err)) /* skb already freed. */ |
d9065a90 | 869 | return err; |
064af421 BP |
870 | break; |
871 | ||
fea393b1 | 872 | case OVS_ACTION_ATTR_POP_VLAN: |
e74d4817 | 873 | err = pop_vlan(skb, key); |
064af421 BP |
874 | break; |
875 | ||
e16138e2 | 876 | case OVS_ACTION_ATTR_RECIRC: |
e74d4817 | 877 | err = execute_recirc(dp, skb, key, a, rem); |
684b5f5d | 878 | if (nla_is_last(a, rem)) { |
867e37ba AZ |
879 | /* If this is the last action, the skb has |
880 | * been consumed or freed. | |
e74d4817 PS |
881 | * Return immediately. |
882 | */ | |
867e37ba AZ |
883 | return err; |
884 | } | |
a6059080 | 885 | break; |
a6059080 | 886 | |
4edb9ae9 | 887 | case OVS_ACTION_ATTR_SET: |
e74d4817 | 888 | err = execute_set_action(skb, key, nla_data(a)); |
064af421 | 889 | break; |
c1c9c9c4 | 890 | |
6ff686f2 | 891 | case OVS_ACTION_ATTR_SAMPLE: |
e74d4817 | 892 | err = sample(dp, skb, key, a); |
6ff686f2 | 893 | break; |
6ff686f2 | 894 | } |
15c39847 | 895 | |
10db8b20 JG |
896 | if (unlikely(err)) { |
897 | kfree_skb(skb); | |
898 | return err; | |
899 | } | |
064af421 | 900 | } |
6c222e55 | 901 | |
fbf4f74d | 902 | if (prev_port != -1) |
064af421 | 903 | do_output(dp, skb, prev_port); |
fbf4f74d | 904 | else |
5b95ab0e | 905 | consume_skb(skb); |
10db8b20 | 906 | |
a5225dd6 | 907 | return 0; |
064af421 | 908 | } |
871dfe07 | 909 | |
2c8c4fb7 AZ |
910 | static void process_deferred_actions(struct datapath *dp) |
911 | { | |
912 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
913 | ||
914 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
915 | if (action_fifo_is_empty(fifo)) | |
916 | return; | |
917 | ||
918 | /* Finishing executing all deferred actions. */ | |
919 | do { | |
920 | struct deferred_action *da = action_fifo_get(fifo); | |
921 | struct sk_buff *skb = da->skb; | |
7d16c847 | 922 | struct sw_flow_key *key = &da->pkt_key; |
2c8c4fb7 AZ |
923 | const struct nlattr *actions = da->actions; |
924 | ||
925 | if (actions) | |
7d16c847 | 926 | do_execute_actions(dp, skb, key, actions, |
2c8c4fb7 AZ |
927 | nla_len(actions)); |
928 | else | |
7d16c847 | 929 | ovs_dp_process_packet(skb, key); |
2c8c4fb7 AZ |
930 | } while (!action_fifo_is_empty(fifo)); |
931 | ||
932 | /* Reset FIFO for the next packet. */ | |
933 | action_fifo_init(fifo); | |
934 | } | |
935 | ||
871dfe07 | 936 | /* Execute a list of actions against 'skb'. */ |
2c8c4fb7 | 937 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
7d16c847 PS |
938 | const struct sw_flow_actions *acts, |
939 | struct sw_flow_key *key) | |
2c8c4fb7 AZ |
940 | { |
941 | int level = this_cpu_read(exec_actions_level); | |
942 | int err; | |
943 | ||
944 | if (unlikely(level >= EXEC_ACTIONS_LEVEL_LIMIT)) { | |
945 | if (net_ratelimit()) | |
946 | pr_warn("%s: packet loop detected, dropping.\n", | |
947 | ovs_dp_name(dp)); | |
948 | ||
949 | kfree_skb(skb); | |
950 | return -ELOOP; | |
951 | } | |
952 | ||
953 | this_cpu_inc(exec_actions_level); | |
7d16c847 PS |
954 | err = do_execute_actions(dp, skb, key, |
955 | acts->actions, acts->actions_len); | |
2c8c4fb7 AZ |
956 | |
957 | if (!level) | |
958 | process_deferred_actions(dp); | |
959 | ||
960 | this_cpu_dec(exec_actions_level); | |
961 | ||
962 | /* This return status currently does not reflect the errors | |
963 | * encounted during deferred actions execution. Probably needs to | |
e74d4817 PS |
964 | * be fixed in the future. |
965 | */ | |
2c8c4fb7 AZ |
966 | return err; |
967 | } | |
968 | ||
969 | int action_fifos_init(void) | |
970 | { | |
971 | action_fifos = alloc_percpu(struct action_fifo); | |
972 | if (!action_fifos) | |
973 | return -ENOMEM; | |
974 | ||
975 | return 0; | |
976 | } | |
977 | ||
978 | void action_fifos_exit(void) | |
60759b2b | 979 | { |
2c8c4fb7 | 980 | free_percpu(action_fifos); |
871dfe07 | 981 | } |