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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> | |
25cd9ba0 | 31 | |
ccb1352e | 32 | #include <net/ip.h> |
3fdbd1ce | 33 | #include <net/ipv6.h> |
ccb1352e JG |
34 | #include <net/checksum.h> |
35 | #include <net/dsfield.h> | |
25cd9ba0 | 36 | #include <net/mpls.h> |
a175a723 | 37 | #include <net/sctp/checksum.h> |
ccb1352e JG |
38 | |
39 | #include "datapath.h" | |
971427f3 | 40 | #include "flow.h" |
ccb1352e JG |
41 | #include "vport.h" |
42 | ||
43 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 44 | struct sw_flow_key *key, |
651887b0 | 45 | const struct nlattr *attr, int len); |
ccb1352e | 46 | |
971427f3 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 | static DEFINE_PER_CPU(int, exec_actions_level); | |
65 | ||
66 | static void action_fifo_init(struct action_fifo *fifo) | |
67 | { | |
68 | fifo->head = 0; | |
69 | fifo->tail = 0; | |
70 | } | |
71 | ||
72 | static bool action_fifo_is_empty(struct action_fifo *fifo) | |
73 | { | |
74 | return (fifo->head == fifo->tail); | |
75 | } | |
76 | ||
77 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) | |
78 | { | |
79 | if (action_fifo_is_empty(fifo)) | |
80 | return NULL; | |
81 | ||
82 | return &fifo->fifo[fifo->tail++]; | |
83 | } | |
84 | ||
85 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) | |
86 | { | |
87 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) | |
88 | return NULL; | |
89 | ||
90 | return &fifo->fifo[fifo->head++]; | |
91 | } | |
92 | ||
93 | /* Return true if fifo is not full */ | |
94 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, | |
95 | struct sw_flow_key *key, | |
96 | const struct nlattr *attr) | |
97 | { | |
98 | struct action_fifo *fifo; | |
99 | struct deferred_action *da; | |
100 | ||
101 | fifo = this_cpu_ptr(action_fifos); | |
102 | da = action_fifo_put(fifo); | |
103 | if (da) { | |
104 | da->skb = skb; | |
105 | da->actions = attr; | |
106 | da->pkt_key = *key; | |
107 | } | |
108 | ||
109 | return da; | |
110 | } | |
111 | ||
fff06c36 PS |
112 | static void invalidate_flow_key(struct sw_flow_key *key) |
113 | { | |
114 | key->eth.type = htons(0); | |
115 | } | |
116 | ||
117 | static bool is_flow_key_valid(const struct sw_flow_key *key) | |
118 | { | |
119 | return !!key->eth.type; | |
120 | } | |
121 | ||
ccb1352e JG |
122 | static int make_writable(struct sk_buff *skb, int write_len) |
123 | { | |
2ba5af42 JB |
124 | if (!pskb_may_pull(skb, write_len)) |
125 | return -ENOMEM; | |
126 | ||
ccb1352e JG |
127 | if (!skb_cloned(skb) || skb_clone_writable(skb, write_len)) |
128 | return 0; | |
129 | ||
130 | return pskb_expand_head(skb, 0, 0, GFP_ATOMIC); | |
131 | } | |
132 | ||
fff06c36 | 133 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
25cd9ba0 SH |
134 | const struct ovs_action_push_mpls *mpls) |
135 | { | |
136 | __be32 *new_mpls_lse; | |
137 | struct ethhdr *hdr; | |
138 | ||
139 | /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */ | |
140 | if (skb->encapsulation) | |
141 | return -ENOTSUPP; | |
142 | ||
143 | if (skb_cow_head(skb, MPLS_HLEN) < 0) | |
144 | return -ENOMEM; | |
145 | ||
146 | skb_push(skb, MPLS_HLEN); | |
147 | memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb), | |
148 | skb->mac_len); | |
149 | skb_reset_mac_header(skb); | |
150 | ||
151 | new_mpls_lse = (__be32 *)skb_mpls_header(skb); | |
152 | *new_mpls_lse = mpls->mpls_lse; | |
153 | ||
154 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
155 | skb->csum = csum_add(skb->csum, csum_partial(new_mpls_lse, | |
156 | MPLS_HLEN, 0)); | |
157 | ||
158 | hdr = eth_hdr(skb); | |
159 | hdr->h_proto = mpls->mpls_ethertype; | |
160 | ||
161 | skb_set_inner_protocol(skb, skb->protocol); | |
162 | skb->protocol = mpls->mpls_ethertype; | |
163 | ||
fff06c36 | 164 | invalidate_flow_key(key); |
25cd9ba0 SH |
165 | return 0; |
166 | } | |
167 | ||
fff06c36 PS |
168 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
169 | const __be16 ethertype) | |
25cd9ba0 SH |
170 | { |
171 | struct ethhdr *hdr; | |
172 | int err; | |
173 | ||
174 | err = make_writable(skb, skb->mac_len + MPLS_HLEN); | |
175 | if (unlikely(err)) | |
176 | return err; | |
177 | ||
178 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
179 | skb->csum = csum_sub(skb->csum, | |
180 | csum_partial(skb_mpls_header(skb), | |
181 | MPLS_HLEN, 0)); | |
182 | ||
183 | memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), | |
184 | skb->mac_len); | |
185 | ||
186 | __skb_pull(skb, MPLS_HLEN); | |
187 | skb_reset_mac_header(skb); | |
188 | ||
189 | /* skb_mpls_header() is used to locate the ethertype | |
190 | * field correctly in the presence of VLAN tags. | |
191 | */ | |
192 | hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN); | |
193 | hdr->h_proto = ethertype; | |
194 | if (eth_p_mpls(skb->protocol)) | |
195 | skb->protocol = ethertype; | |
fff06c36 PS |
196 | |
197 | invalidate_flow_key(key); | |
25cd9ba0 SH |
198 | return 0; |
199 | } | |
200 | ||
fff06c36 PS |
201 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
202 | const __be32 *mpls_lse) | |
25cd9ba0 SH |
203 | { |
204 | __be32 *stack; | |
205 | int err; | |
206 | ||
207 | err = make_writable(skb, skb->mac_len + MPLS_HLEN); | |
208 | if (unlikely(err)) | |
209 | return err; | |
210 | ||
211 | stack = (__be32 *)skb_mpls_header(skb); | |
212 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
213 | __be32 diff[] = { ~(*stack), *mpls_lse }; | |
25cd9ba0 SH |
214 | skb->csum = ~csum_partial((char *)diff, sizeof(diff), |
215 | ~skb->csum); | |
216 | } | |
217 | ||
218 | *stack = *mpls_lse; | |
fff06c36 | 219 | key->mpls.top_lse = *mpls_lse; |
25cd9ba0 SH |
220 | return 0; |
221 | } | |
222 | ||
39855b5b | 223 | /* remove VLAN header from packet and update csum accordingly. */ |
ccb1352e JG |
224 | static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci) |
225 | { | |
226 | struct vlan_hdr *vhdr; | |
227 | int err; | |
228 | ||
229 | err = make_writable(skb, VLAN_ETH_HLEN); | |
230 | if (unlikely(err)) | |
231 | return err; | |
232 | ||
233 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
234 | skb->csum = csum_sub(skb->csum, csum_partial(skb->data | |
7b024082 | 235 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
ccb1352e JG |
236 | |
237 | vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN); | |
238 | *current_tci = vhdr->h_vlan_TCI; | |
239 | ||
240 | memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); | |
241 | __skb_pull(skb, VLAN_HLEN); | |
242 | ||
243 | vlan_set_encap_proto(skb, vhdr); | |
244 | skb->mac_header += VLAN_HLEN; | |
25cd9ba0 | 245 | |
2ba5af42 JB |
246 | if (skb_network_offset(skb) < ETH_HLEN) |
247 | skb_set_network_header(skb, ETH_HLEN); | |
ccb1352e | 248 | |
25cd9ba0 SH |
249 | /* Update mac_len for subsequent MPLS actions */ |
250 | skb_reset_mac_len(skb); | |
ccb1352e JG |
251 | return 0; |
252 | } | |
253 | ||
fff06c36 | 254 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e JG |
255 | { |
256 | __be16 tci; | |
257 | int err; | |
258 | ||
259 | if (likely(vlan_tx_tag_present(skb))) { | |
260 | skb->vlan_tci = 0; | |
261 | } else { | |
262 | if (unlikely(skb->protocol != htons(ETH_P_8021Q) || | |
263 | skb->len < VLAN_ETH_HLEN)) | |
264 | return 0; | |
265 | ||
266 | err = __pop_vlan_tci(skb, &tci); | |
267 | if (err) | |
268 | return err; | |
269 | } | |
270 | /* move next vlan tag to hw accel tag */ | |
271 | if (likely(skb->protocol != htons(ETH_P_8021Q) || | |
fff06c36 PS |
272 | skb->len < VLAN_ETH_HLEN)) { |
273 | key->eth.tci = 0; | |
ccb1352e | 274 | return 0; |
fff06c36 | 275 | } |
ccb1352e | 276 | |
fff06c36 | 277 | invalidate_flow_key(key); |
ccb1352e JG |
278 | err = __pop_vlan_tci(skb, &tci); |
279 | if (unlikely(err)) | |
280 | return err; | |
281 | ||
86a9bad3 | 282 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci)); |
ccb1352e JG |
283 | return 0; |
284 | } | |
285 | ||
fff06c36 PS |
286 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
287 | const struct ovs_action_push_vlan *vlan) | |
ccb1352e JG |
288 | { |
289 | if (unlikely(vlan_tx_tag_present(skb))) { | |
290 | u16 current_tag; | |
291 | ||
292 | /* push down current VLAN tag */ | |
293 | current_tag = vlan_tx_tag_get(skb); | |
294 | ||
86a9bad3 | 295 | if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag)) |
ccb1352e | 296 | return -ENOMEM; |
25cd9ba0 SH |
297 | /* Update mac_len for subsequent MPLS actions */ |
298 | skb->mac_len += VLAN_HLEN; | |
ccb1352e JG |
299 | |
300 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
301 | skb->csum = csum_add(skb->csum, csum_partial(skb->data | |
7b024082 | 302 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
ccb1352e | 303 | |
fff06c36 PS |
304 | invalidate_flow_key(key); |
305 | } else { | |
306 | key->eth.tci = vlan->vlan_tci; | |
ccb1352e | 307 | } |
86a9bad3 | 308 | __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); |
ccb1352e JG |
309 | return 0; |
310 | } | |
311 | ||
fff06c36 | 312 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *key, |
ccb1352e JG |
313 | const struct ovs_key_ethernet *eth_key) |
314 | { | |
315 | int err; | |
316 | err = make_writable(skb, ETH_HLEN); | |
317 | if (unlikely(err)) | |
318 | return err; | |
319 | ||
b34df5e8 PS |
320 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
321 | ||
8c63ff09 JP |
322 | ether_addr_copy(eth_hdr(skb)->h_source, eth_key->eth_src); |
323 | ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst); | |
ccb1352e | 324 | |
b34df5e8 PS |
325 | ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
326 | ||
fff06c36 PS |
327 | ether_addr_copy(key->eth.src, eth_key->eth_src); |
328 | ether_addr_copy(key->eth.dst, eth_key->eth_dst); | |
ccb1352e JG |
329 | return 0; |
330 | } | |
331 | ||
332 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, | |
fff06c36 | 333 | __be32 *addr, __be32 new_addr) |
ccb1352e JG |
334 | { |
335 | int transport_len = skb->len - skb_transport_offset(skb); | |
336 | ||
337 | if (nh->protocol == IPPROTO_TCP) { | |
338 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
339 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, | |
340 | *addr, new_addr, 1); | |
341 | } else if (nh->protocol == IPPROTO_UDP) { | |
81e5d41d JG |
342 | if (likely(transport_len >= sizeof(struct udphdr))) { |
343 | struct udphdr *uh = udp_hdr(skb); | |
344 | ||
345 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
346 | inet_proto_csum_replace4(&uh->check, skb, | |
347 | *addr, new_addr, 1); | |
348 | if (!uh->check) | |
349 | uh->check = CSUM_MANGLED_0; | |
350 | } | |
351 | } | |
ccb1352e JG |
352 | } |
353 | ||
354 | csum_replace4(&nh->check, *addr, new_addr); | |
7539fadc | 355 | skb_clear_hash(skb); |
ccb1352e JG |
356 | *addr = new_addr; |
357 | } | |
358 | ||
3fdbd1ce AA |
359 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
360 | __be32 addr[4], const __be32 new_addr[4]) | |
361 | { | |
362 | int transport_len = skb->len - skb_transport_offset(skb); | |
363 | ||
364 | if (l4_proto == IPPROTO_TCP) { | |
365 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
366 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
367 | addr, new_addr, 1); | |
368 | } else if (l4_proto == IPPROTO_UDP) { | |
369 | if (likely(transport_len >= sizeof(struct udphdr))) { | |
370 | struct udphdr *uh = udp_hdr(skb); | |
371 | ||
372 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
373 | inet_proto_csum_replace16(&uh->check, skb, | |
374 | addr, new_addr, 1); | |
375 | if (!uh->check) | |
376 | uh->check = CSUM_MANGLED_0; | |
377 | } | |
378 | } | |
379 | } | |
380 | } | |
381 | ||
382 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, | |
383 | __be32 addr[4], const __be32 new_addr[4], | |
384 | bool recalculate_csum) | |
385 | { | |
386 | if (recalculate_csum) | |
387 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); | |
388 | ||
7539fadc | 389 | skb_clear_hash(skb); |
3fdbd1ce AA |
390 | memcpy(addr, new_addr, sizeof(__be32[4])); |
391 | } | |
392 | ||
393 | static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc) | |
394 | { | |
395 | nh->priority = tc >> 4; | |
396 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4); | |
397 | } | |
398 | ||
399 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl) | |
400 | { | |
401 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16; | |
402 | nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8; | |
403 | nh->flow_lbl[2] = fl & 0x000000FF; | |
404 | } | |
405 | ||
ccb1352e JG |
406 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl) |
407 | { | |
408 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); | |
409 | nh->ttl = new_ttl; | |
410 | } | |
411 | ||
fff06c36 PS |
412 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *key, |
413 | const struct ovs_key_ipv4 *ipv4_key) | |
ccb1352e JG |
414 | { |
415 | struct iphdr *nh; | |
416 | int err; | |
417 | ||
418 | err = make_writable(skb, skb_network_offset(skb) + | |
419 | sizeof(struct iphdr)); | |
420 | if (unlikely(err)) | |
421 | return err; | |
422 | ||
423 | nh = ip_hdr(skb); | |
424 | ||
fff06c36 | 425 | if (ipv4_key->ipv4_src != nh->saddr) { |
ccb1352e | 426 | set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src); |
fff06c36 PS |
427 | key->ipv4.addr.src = ipv4_key->ipv4_src; |
428 | } | |
ccb1352e | 429 | |
fff06c36 | 430 | if (ipv4_key->ipv4_dst != nh->daddr) { |
ccb1352e | 431 | set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst); |
fff06c36 PS |
432 | key->ipv4.addr.dst = ipv4_key->ipv4_dst; |
433 | } | |
ccb1352e | 434 | |
fff06c36 | 435 | if (ipv4_key->ipv4_tos != nh->tos) { |
ccb1352e | 436 | ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos); |
fff06c36 PS |
437 | key->ip.tos = nh->tos; |
438 | } | |
ccb1352e | 439 | |
fff06c36 | 440 | if (ipv4_key->ipv4_ttl != nh->ttl) { |
ccb1352e | 441 | set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl); |
fff06c36 PS |
442 | key->ip.ttl = ipv4_key->ipv4_ttl; |
443 | } | |
ccb1352e JG |
444 | |
445 | return 0; | |
446 | } | |
447 | ||
fff06c36 PS |
448 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *key, |
449 | const struct ovs_key_ipv6 *ipv6_key) | |
3fdbd1ce AA |
450 | { |
451 | struct ipv6hdr *nh; | |
452 | int err; | |
453 | __be32 *saddr; | |
454 | __be32 *daddr; | |
455 | ||
456 | err = make_writable(skb, skb_network_offset(skb) + | |
457 | sizeof(struct ipv6hdr)); | |
458 | if (unlikely(err)) | |
459 | return err; | |
460 | ||
461 | nh = ipv6_hdr(skb); | |
462 | saddr = (__be32 *)&nh->saddr; | |
463 | daddr = (__be32 *)&nh->daddr; | |
464 | ||
fff06c36 | 465 | if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) { |
3fdbd1ce AA |
466 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr, |
467 | ipv6_key->ipv6_src, true); | |
fff06c36 PS |
468 | memcpy(&key->ipv6.addr.src, ipv6_key->ipv6_src, |
469 | sizeof(ipv6_key->ipv6_src)); | |
470 | } | |
3fdbd1ce AA |
471 | |
472 | if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) { | |
473 | unsigned int offset = 0; | |
474 | int flags = IP6_FH_F_SKIP_RH; | |
475 | bool recalc_csum = true; | |
476 | ||
477 | if (ipv6_ext_hdr(nh->nexthdr)) | |
478 | recalc_csum = ipv6_find_hdr(skb, &offset, | |
479 | NEXTHDR_ROUTING, NULL, | |
480 | &flags) != NEXTHDR_ROUTING; | |
481 | ||
482 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr, | |
483 | ipv6_key->ipv6_dst, recalc_csum); | |
fff06c36 PS |
484 | memcpy(&key->ipv6.addr.dst, ipv6_key->ipv6_dst, |
485 | sizeof(ipv6_key->ipv6_dst)); | |
3fdbd1ce AA |
486 | } |
487 | ||
488 | set_ipv6_tc(nh, ipv6_key->ipv6_tclass); | |
fff06c36 PS |
489 | key->ip.tos = ipv6_get_dsfield(nh); |
490 | ||
3fdbd1ce | 491 | set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label)); |
fff06c36 | 492 | key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); |
3fdbd1ce | 493 | |
fff06c36 PS |
494 | nh->hop_limit = ipv6_key->ipv6_hlimit; |
495 | key->ip.ttl = ipv6_key->ipv6_hlimit; | |
3fdbd1ce AA |
496 | return 0; |
497 | } | |
498 | ||
ccb1352e JG |
499 | /* Must follow make_writable() since that can move the skb data. */ |
500 | static void set_tp_port(struct sk_buff *skb, __be16 *port, | |
501 | __be16 new_port, __sum16 *check) | |
502 | { | |
503 | inet_proto_csum_replace2(check, skb, *port, new_port, 0); | |
504 | *port = new_port; | |
7539fadc | 505 | skb_clear_hash(skb); |
ccb1352e JG |
506 | } |
507 | ||
81e5d41d JG |
508 | static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port) |
509 | { | |
510 | struct udphdr *uh = udp_hdr(skb); | |
511 | ||
512 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { | |
513 | set_tp_port(skb, port, new_port, &uh->check); | |
514 | ||
515 | if (!uh->check) | |
516 | uh->check = CSUM_MANGLED_0; | |
517 | } else { | |
518 | *port = new_port; | |
7539fadc | 519 | skb_clear_hash(skb); |
81e5d41d JG |
520 | } |
521 | } | |
522 | ||
fff06c36 PS |
523 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *key, |
524 | const struct ovs_key_udp *udp_port_key) | |
ccb1352e JG |
525 | { |
526 | struct udphdr *uh; | |
527 | int err; | |
528 | ||
529 | err = make_writable(skb, skb_transport_offset(skb) + | |
530 | sizeof(struct udphdr)); | |
531 | if (unlikely(err)) | |
532 | return err; | |
533 | ||
534 | uh = udp_hdr(skb); | |
fff06c36 | 535 | if (udp_port_key->udp_src != uh->source) { |
81e5d41d | 536 | set_udp_port(skb, &uh->source, udp_port_key->udp_src); |
fff06c36 PS |
537 | key->tp.src = udp_port_key->udp_src; |
538 | } | |
ccb1352e | 539 | |
fff06c36 | 540 | if (udp_port_key->udp_dst != uh->dest) { |
81e5d41d | 541 | set_udp_port(skb, &uh->dest, udp_port_key->udp_dst); |
fff06c36 PS |
542 | key->tp.dst = udp_port_key->udp_dst; |
543 | } | |
ccb1352e JG |
544 | |
545 | return 0; | |
546 | } | |
547 | ||
fff06c36 PS |
548 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *key, |
549 | const struct ovs_key_tcp *tcp_port_key) | |
ccb1352e JG |
550 | { |
551 | struct tcphdr *th; | |
552 | int err; | |
553 | ||
554 | err = make_writable(skb, skb_transport_offset(skb) + | |
555 | sizeof(struct tcphdr)); | |
556 | if (unlikely(err)) | |
557 | return err; | |
558 | ||
559 | th = tcp_hdr(skb); | |
fff06c36 | 560 | if (tcp_port_key->tcp_src != th->source) { |
ccb1352e | 561 | set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check); |
fff06c36 PS |
562 | key->tp.src = tcp_port_key->tcp_src; |
563 | } | |
ccb1352e | 564 | |
fff06c36 | 565 | if (tcp_port_key->tcp_dst != th->dest) { |
ccb1352e | 566 | set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check); |
fff06c36 PS |
567 | key->tp.dst = tcp_port_key->tcp_dst; |
568 | } | |
ccb1352e JG |
569 | |
570 | return 0; | |
571 | } | |
572 | ||
fff06c36 PS |
573 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *key, |
574 | const struct ovs_key_sctp *sctp_port_key) | |
a175a723 JS |
575 | { |
576 | struct sctphdr *sh; | |
577 | int err; | |
578 | unsigned int sctphoff = skb_transport_offset(skb); | |
579 | ||
580 | err = make_writable(skb, sctphoff + sizeof(struct sctphdr)); | |
581 | if (unlikely(err)) | |
582 | return err; | |
583 | ||
584 | sh = sctp_hdr(skb); | |
585 | if (sctp_port_key->sctp_src != sh->source || | |
586 | sctp_port_key->sctp_dst != sh->dest) { | |
587 | __le32 old_correct_csum, new_csum, old_csum; | |
588 | ||
589 | old_csum = sh->checksum; | |
590 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
591 | ||
592 | sh->source = sctp_port_key->sctp_src; | |
593 | sh->dest = sctp_port_key->sctp_dst; | |
594 | ||
595 | new_csum = sctp_compute_cksum(skb, sctphoff); | |
596 | ||
597 | /* Carry any checksum errors through. */ | |
598 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
599 | ||
7539fadc | 600 | skb_clear_hash(skb); |
fff06c36 PS |
601 | key->tp.src = sctp_port_key->sctp_src; |
602 | key->tp.dst = sctp_port_key->sctp_dst; | |
a175a723 JS |
603 | } |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
738967b8 | 608 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port) |
ccb1352e | 609 | { |
738967b8 | 610 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
ccb1352e | 611 | |
738967b8 AZ |
612 | if (likely(vport)) |
613 | ovs_vport_send(vport, skb); | |
614 | else | |
ccb1352e | 615 | kfree_skb(skb); |
ccb1352e JG |
616 | } |
617 | ||
618 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 619 | struct sw_flow_key *key, const struct nlattr *attr) |
ccb1352e | 620 | { |
8f0aad6f | 621 | struct ovs_tunnel_info info; |
ccb1352e JG |
622 | struct dp_upcall_info upcall; |
623 | const struct nlattr *a; | |
624 | int rem; | |
625 | ||
626 | upcall.cmd = OVS_PACKET_CMD_ACTION; | |
ccb1352e | 627 | upcall.userdata = NULL; |
15e47304 | 628 | upcall.portid = 0; |
8f0aad6f | 629 | upcall.egress_tun_info = NULL; |
ccb1352e JG |
630 | |
631 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
632 | a = nla_next(a, &rem)) { | |
633 | switch (nla_type(a)) { | |
634 | case OVS_USERSPACE_ATTR_USERDATA: | |
635 | upcall.userdata = a; | |
636 | break; | |
637 | ||
638 | case OVS_USERSPACE_ATTR_PID: | |
15e47304 | 639 | upcall.portid = nla_get_u32(a); |
ccb1352e | 640 | break; |
8f0aad6f WZ |
641 | |
642 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
643 | /* Get out tunnel info. */ | |
644 | struct vport *vport; | |
645 | ||
646 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
647 | if (vport) { | |
648 | int err; | |
649 | ||
650 | err = ovs_vport_get_egress_tun_info(vport, skb, | |
651 | &info); | |
652 | if (!err) | |
653 | upcall.egress_tun_info = &info; | |
654 | } | |
655 | break; | |
ccb1352e | 656 | } |
8f0aad6f WZ |
657 | |
658 | } /* End of switch. */ | |
ccb1352e JG |
659 | } |
660 | ||
e8eedb85 | 661 | return ovs_dp_upcall(dp, skb, key, &upcall); |
ccb1352e JG |
662 | } |
663 | ||
664 | static int sample(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 665 | struct sw_flow_key *key, const struct nlattr *attr) |
ccb1352e JG |
666 | { |
667 | const struct nlattr *acts_list = NULL; | |
668 | const struct nlattr *a; | |
669 | int rem; | |
670 | ||
671 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
672 | a = nla_next(a, &rem)) { | |
673 | switch (nla_type(a)) { | |
674 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
63862b5b | 675 | if (prandom_u32() >= nla_get_u32(a)) |
ccb1352e JG |
676 | return 0; |
677 | break; | |
678 | ||
679 | case OVS_SAMPLE_ATTR_ACTIONS: | |
680 | acts_list = a; | |
681 | break; | |
682 | } | |
683 | } | |
684 | ||
651887b0 SH |
685 | rem = nla_len(acts_list); |
686 | a = nla_data(acts_list); | |
687 | ||
32ae87ff AZ |
688 | /* Actions list is empty, do nothing */ |
689 | if (unlikely(!rem)) | |
690 | return 0; | |
651887b0 | 691 | |
32ae87ff AZ |
692 | /* The only known usage of sample action is having a single user-space |
693 | * action. Treat this usage as a special case. | |
694 | * The output_userspace() should clone the skb to be sent to the | |
695 | * user space. This skb will be consumed by its caller. | |
651887b0 | 696 | */ |
32ae87ff | 697 | if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE && |
941d8ebc | 698 | nla_is_last(a, rem))) |
32ae87ff AZ |
699 | return output_userspace(dp, skb, key, a); |
700 | ||
701 | skb = skb_clone(skb, GFP_ATOMIC); | |
702 | if (!skb) | |
703 | /* Skip the sample action when out of memory. */ | |
704 | return 0; | |
705 | ||
971427f3 AZ |
706 | if (!add_deferred_actions(skb, key, a)) { |
707 | if (net_ratelimit()) | |
708 | pr_warn("%s: deferred actions limit reached, dropping sample action\n", | |
709 | ovs_dp_name(dp)); | |
710 | ||
711 | kfree_skb(skb); | |
712 | } | |
713 | return 0; | |
714 | } | |
715 | ||
716 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, | |
717 | const struct nlattr *attr) | |
718 | { | |
719 | struct ovs_action_hash *hash_act = nla_data(attr); | |
720 | u32 hash = 0; | |
721 | ||
722 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
723 | hash = skb_get_hash(skb); | |
724 | hash = jhash_1word(hash, hash_act->hash_basis); | |
725 | if (!hash) | |
726 | hash = 0x1; | |
727 | ||
728 | key->ovs_flow_hash = hash; | |
ccb1352e JG |
729 | } |
730 | ||
fff06c36 PS |
731 | static int execute_set_action(struct sk_buff *skb, struct sw_flow_key *key, |
732 | const struct nlattr *nested_attr) | |
ccb1352e JG |
733 | { |
734 | int err = 0; | |
735 | ||
736 | switch (nla_type(nested_attr)) { | |
737 | case OVS_KEY_ATTR_PRIORITY: | |
738 | skb->priority = nla_get_u32(nested_attr); | |
fff06c36 | 739 | key->phy.priority = skb->priority; |
ccb1352e JG |
740 | break; |
741 | ||
39c7caeb AA |
742 | case OVS_KEY_ATTR_SKB_MARK: |
743 | skb->mark = nla_get_u32(nested_attr); | |
fff06c36 | 744 | key->phy.skb_mark = skb->mark; |
39c7caeb AA |
745 | break; |
746 | ||
f0b128c1 JG |
747 | case OVS_KEY_ATTR_TUNNEL_INFO: |
748 | OVS_CB(skb)->egress_tun_info = nla_data(nested_attr); | |
7d5437c7 PS |
749 | break; |
750 | ||
ccb1352e | 751 | case OVS_KEY_ATTR_ETHERNET: |
fff06c36 | 752 | err = set_eth_addr(skb, key, nla_data(nested_attr)); |
ccb1352e JG |
753 | break; |
754 | ||
755 | case OVS_KEY_ATTR_IPV4: | |
fff06c36 | 756 | err = set_ipv4(skb, key, nla_data(nested_attr)); |
ccb1352e JG |
757 | break; |
758 | ||
3fdbd1ce | 759 | case OVS_KEY_ATTR_IPV6: |
fff06c36 | 760 | err = set_ipv6(skb, key, nla_data(nested_attr)); |
3fdbd1ce AA |
761 | break; |
762 | ||
ccb1352e | 763 | case OVS_KEY_ATTR_TCP: |
fff06c36 | 764 | err = set_tcp(skb, key, nla_data(nested_attr)); |
ccb1352e JG |
765 | break; |
766 | ||
767 | case OVS_KEY_ATTR_UDP: | |
fff06c36 | 768 | err = set_udp(skb, key, nla_data(nested_attr)); |
ccb1352e | 769 | break; |
a175a723 JS |
770 | |
771 | case OVS_KEY_ATTR_SCTP: | |
fff06c36 | 772 | err = set_sctp(skb, key, nla_data(nested_attr)); |
a175a723 | 773 | break; |
25cd9ba0 SH |
774 | |
775 | case OVS_KEY_ATTR_MPLS: | |
fff06c36 | 776 | err = set_mpls(skb, key, nla_data(nested_attr)); |
25cd9ba0 | 777 | break; |
ccb1352e JG |
778 | } |
779 | ||
780 | return err; | |
781 | } | |
782 | ||
971427f3 AZ |
783 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
784 | struct sw_flow_key *key, | |
785 | const struct nlattr *a, int rem) | |
786 | { | |
787 | struct deferred_action *da; | |
971427f3 | 788 | |
fff06c36 PS |
789 | if (!is_flow_key_valid(key)) { |
790 | int err; | |
791 | ||
792 | err = ovs_flow_key_update(skb, key); | |
793 | if (err) | |
794 | return err; | |
795 | } | |
796 | BUG_ON(!is_flow_key_valid(key)); | |
971427f3 | 797 | |
941d8ebc | 798 | if (!nla_is_last(a, rem)) { |
971427f3 AZ |
799 | /* Recirc action is the not the last action |
800 | * of the action list, need to clone the skb. | |
801 | */ | |
802 | skb = skb_clone(skb, GFP_ATOMIC); | |
803 | ||
804 | /* Skip the recirc action when out of memory, but | |
805 | * continue on with the rest of the action list. | |
806 | */ | |
807 | if (!skb) | |
808 | return 0; | |
809 | } | |
810 | ||
811 | da = add_deferred_actions(skb, key, NULL); | |
812 | if (da) { | |
813 | da->pkt_key.recirc_id = nla_get_u32(a); | |
814 | } else { | |
815 | kfree_skb(skb); | |
816 | ||
817 | if (net_ratelimit()) | |
818 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
819 | ovs_dp_name(dp)); | |
820 | } | |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
ccb1352e JG |
825 | /* Execute a list of actions against 'skb'. */ |
826 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 827 | struct sw_flow_key *key, |
651887b0 | 828 | const struct nlattr *attr, int len) |
ccb1352e JG |
829 | { |
830 | /* Every output action needs a separate clone of 'skb', but the common | |
831 | * case is just a single output action, so that doing a clone and | |
832 | * then freeing the original skbuff is wasteful. So the following code | |
fff06c36 PS |
833 | * is slightly obscure just to avoid that. |
834 | */ | |
ccb1352e JG |
835 | int prev_port = -1; |
836 | const struct nlattr *a; | |
837 | int rem; | |
838 | ||
839 | for (a = attr, rem = len; rem > 0; | |
840 | a = nla_next(a, &rem)) { | |
841 | int err = 0; | |
842 | ||
738967b8 AZ |
843 | if (unlikely(prev_port != -1)) { |
844 | struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC); | |
845 | ||
846 | if (out_skb) | |
847 | do_output(dp, out_skb, prev_port); | |
848 | ||
ccb1352e JG |
849 | prev_port = -1; |
850 | } | |
851 | ||
852 | switch (nla_type(a)) { | |
853 | case OVS_ACTION_ATTR_OUTPUT: | |
854 | prev_port = nla_get_u32(a); | |
855 | break; | |
856 | ||
857 | case OVS_ACTION_ATTR_USERSPACE: | |
2ff3e4e4 | 858 | output_userspace(dp, skb, key, a); |
ccb1352e JG |
859 | break; |
860 | ||
971427f3 AZ |
861 | case OVS_ACTION_ATTR_HASH: |
862 | execute_hash(skb, key, a); | |
863 | break; | |
864 | ||
25cd9ba0 | 865 | case OVS_ACTION_ATTR_PUSH_MPLS: |
fff06c36 | 866 | err = push_mpls(skb, key, nla_data(a)); |
25cd9ba0 SH |
867 | break; |
868 | ||
869 | case OVS_ACTION_ATTR_POP_MPLS: | |
fff06c36 | 870 | err = pop_mpls(skb, key, nla_get_be16(a)); |
25cd9ba0 SH |
871 | break; |
872 | ||
ccb1352e | 873 | case OVS_ACTION_ATTR_PUSH_VLAN: |
fff06c36 | 874 | err = push_vlan(skb, key, nla_data(a)); |
ccb1352e JG |
875 | if (unlikely(err)) /* skb already freed. */ |
876 | return err; | |
877 | break; | |
878 | ||
879 | case OVS_ACTION_ATTR_POP_VLAN: | |
fff06c36 | 880 | err = pop_vlan(skb, key); |
ccb1352e JG |
881 | break; |
882 | ||
971427f3 AZ |
883 | case OVS_ACTION_ATTR_RECIRC: |
884 | err = execute_recirc(dp, skb, key, a, rem); | |
941d8ebc | 885 | if (nla_is_last(a, rem)) { |
971427f3 AZ |
886 | /* If this is the last action, the skb has |
887 | * been consumed or freed. | |
888 | * Return immediately. | |
889 | */ | |
890 | return err; | |
891 | } | |
892 | break; | |
893 | ||
ccb1352e | 894 | case OVS_ACTION_ATTR_SET: |
fff06c36 | 895 | err = execute_set_action(skb, key, nla_data(a)); |
ccb1352e JG |
896 | break; |
897 | ||
898 | case OVS_ACTION_ATTR_SAMPLE: | |
2ff3e4e4 | 899 | err = sample(dp, skb, key, a); |
fe984c08 AZ |
900 | if (unlikely(err)) /* skb already freed. */ |
901 | return err; | |
ccb1352e JG |
902 | break; |
903 | } | |
904 | ||
905 | if (unlikely(err)) { | |
906 | kfree_skb(skb); | |
907 | return err; | |
908 | } | |
909 | } | |
910 | ||
651887b0 | 911 | if (prev_port != -1) |
ccb1352e | 912 | do_output(dp, skb, prev_port); |
651887b0 | 913 | else |
ccb1352e JG |
914 | consume_skb(skb); |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
971427f3 AZ |
919 | static void process_deferred_actions(struct datapath *dp) |
920 | { | |
921 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
922 | ||
923 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
924 | if (action_fifo_is_empty(fifo)) | |
925 | return; | |
926 | ||
927 | /* Finishing executing all deferred actions. */ | |
928 | do { | |
929 | struct deferred_action *da = action_fifo_get(fifo); | |
930 | struct sk_buff *skb = da->skb; | |
931 | struct sw_flow_key *key = &da->pkt_key; | |
932 | const struct nlattr *actions = da->actions; | |
933 | ||
934 | if (actions) | |
935 | do_execute_actions(dp, skb, key, actions, | |
936 | nla_len(actions)); | |
937 | else | |
938 | ovs_dp_process_packet(skb, key); | |
939 | } while (!action_fifo_is_empty(fifo)); | |
940 | ||
941 | /* Reset FIFO for the next packet. */ | |
942 | action_fifo_init(fifo); | |
943 | } | |
944 | ||
ccb1352e | 945 | /* Execute a list of actions against 'skb'. */ |
2ff3e4e4 | 946 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
d98612b8 | 947 | struct sw_flow_actions *acts, struct sw_flow_key *key) |
ccb1352e | 948 | { |
971427f3 | 949 | int level = this_cpu_read(exec_actions_level); |
971427f3 AZ |
950 | int err; |
951 | ||
971427f3 | 952 | this_cpu_inc(exec_actions_level); |
f0b128c1 | 953 | OVS_CB(skb)->egress_tun_info = NULL; |
971427f3 AZ |
954 | err = do_execute_actions(dp, skb, key, |
955 | acts->actions, acts->actions_len); | |
956 | ||
957 | if (!level) | |
958 | process_deferred_actions(dp); | |
959 | ||
960 | this_cpu_dec(exec_actions_level); | |
961 | return err; | |
962 | } | |
963 | ||
964 | int action_fifos_init(void) | |
965 | { | |
966 | action_fifos = alloc_percpu(struct action_fifo); | |
967 | if (!action_fifos) | |
968 | return -ENOMEM; | |
ccb1352e | 969 | |
971427f3 AZ |
970 | return 0; |
971 | } | |
972 | ||
973 | void action_fifos_exit(void) | |
974 | { | |
975 | free_percpu(action_fifos); | |
ccb1352e | 976 | } |