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c9422999 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ccb1352e | 2 | /* |
4572ef52 | 3 | * Copyright (c) 2007-2017 Nicira, Inc. |
ccb1352e JG |
4 | */ |
5 | ||
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
7 | ||
8 | #include <linux/skbuff.h> | |
9 | #include <linux/in.h> | |
10 | #include <linux/ip.h> | |
11 | #include <linux/openvswitch.h> | |
7f8a436e | 12 | #include <linux/netfilter_ipv6.h> |
a175a723 | 13 | #include <linux/sctp.h> |
ccb1352e JG |
14 | #include <linux/tcp.h> |
15 | #include <linux/udp.h> | |
16 | #include <linux/in6.h> | |
17 | #include <linux/if_arp.h> | |
18 | #include <linux/if_vlan.h> | |
25cd9ba0 | 19 | |
7f8a436e | 20 | #include <net/dst.h> |
ccb1352e | 21 | #include <net/ip.h> |
3fdbd1ce | 22 | #include <net/ipv6.h> |
7b85b4df | 23 | #include <net/ip6_fib.h> |
ccb1352e JG |
24 | #include <net/checksum.h> |
25 | #include <net/dsfield.h> | |
25cd9ba0 | 26 | #include <net/mpls.h> |
a175a723 | 27 | #include <net/sctp/checksum.h> |
ccb1352e JG |
28 | |
29 | #include "datapath.h" | |
971427f3 | 30 | #include "flow.h" |
7f8a436e | 31 | #include "conntrack.h" |
ccb1352e | 32 | #include "vport.h" |
b2d0f5d5 | 33 | #include "flow_netlink.h" |
ccb1352e | 34 | |
971427f3 AZ |
35 | struct deferred_action { |
36 | struct sk_buff *skb; | |
37 | const struct nlattr *actions; | |
47c697aa | 38 | int actions_len; |
971427f3 AZ |
39 | |
40 | /* Store pkt_key clone when creating deferred action. */ | |
41 | struct sw_flow_key pkt_key; | |
42 | }; | |
43 | ||
7f8a436e JS |
44 | #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN) |
45 | struct ovs_frag_data { | |
46 | unsigned long dst; | |
47 | struct vport *vport; | |
48 | struct ovs_skb_cb cb; | |
49 | __be16 inner_protocol; | |
c66549ff JB |
50 | u16 network_offset; /* valid only for MPLS */ |
51 | u16 vlan_tci; | |
7f8a436e JS |
52 | __be16 vlan_proto; |
53 | unsigned int l2_len; | |
e2d9d835 | 54 | u8 mac_proto; |
7f8a436e JS |
55 | u8 l2_data[MAX_L2_LEN]; |
56 | }; | |
57 | ||
58 | static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage); | |
59 | ||
971427f3 | 60 | #define DEFERRED_ACTION_FIFO_SIZE 10 |
2679d040 LR |
61 | #define OVS_RECURSION_LIMIT 5 |
62 | #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2) | |
971427f3 AZ |
63 | struct action_fifo { |
64 | int head; | |
65 | int tail; | |
66 | /* Deferred action fifo queue storage. */ | |
67 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; | |
68 | }; | |
69 | ||
4572ef52 | 70 | struct action_flow_keys { |
2679d040 LR |
71 | struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD]; |
72 | }; | |
73 | ||
971427f3 | 74 | static struct action_fifo __percpu *action_fifos; |
4572ef52 | 75 | static struct action_flow_keys __percpu *flow_keys; |
971427f3 AZ |
76 | static DEFINE_PER_CPU(int, exec_actions_level); |
77 | ||
4572ef52 | 78 | /* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys' |
79 | * space. Return NULL if out of key spaces. | |
80 | */ | |
81 | static struct sw_flow_key *clone_key(const struct sw_flow_key *key_) | |
82 | { | |
83 | struct action_flow_keys *keys = this_cpu_ptr(flow_keys); | |
84 | int level = this_cpu_read(exec_actions_level); | |
85 | struct sw_flow_key *key = NULL; | |
86 | ||
87 | if (level <= OVS_DEFERRED_ACTION_THRESHOLD) { | |
88 | key = &keys->key[level - 1]; | |
89 | *key = *key_; | |
90 | } | |
91 | ||
92 | return key; | |
93 | } | |
94 | ||
971427f3 AZ |
95 | static void action_fifo_init(struct action_fifo *fifo) |
96 | { | |
97 | fifo->head = 0; | |
98 | fifo->tail = 0; | |
99 | } | |
100 | ||
12eb18f7 | 101 | static bool action_fifo_is_empty(const struct action_fifo *fifo) |
971427f3 AZ |
102 | { |
103 | return (fifo->head == fifo->tail); | |
104 | } | |
105 | ||
106 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) | |
107 | { | |
108 | if (action_fifo_is_empty(fifo)) | |
109 | return NULL; | |
110 | ||
111 | return &fifo->fifo[fifo->tail++]; | |
112 | } | |
113 | ||
114 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) | |
115 | { | |
116 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) | |
117 | return NULL; | |
118 | ||
119 | return &fifo->fifo[fifo->head++]; | |
120 | } | |
121 | ||
122 | /* Return true if fifo is not full */ | |
123 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, | |
47c697aa | 124 | const struct sw_flow_key *key, |
125 | const struct nlattr *actions, | |
126 | const int actions_len) | |
971427f3 AZ |
127 | { |
128 | struct action_fifo *fifo; | |
129 | struct deferred_action *da; | |
130 | ||
131 | fifo = this_cpu_ptr(action_fifos); | |
132 | da = action_fifo_put(fifo); | |
133 | if (da) { | |
134 | da->skb = skb; | |
47c697aa | 135 | da->actions = actions; |
136 | da->actions_len = actions_len; | |
971427f3 AZ |
137 | da->pkt_key = *key; |
138 | } | |
139 | ||
140 | return da; | |
141 | } | |
142 | ||
fff06c36 PS |
143 | static void invalidate_flow_key(struct sw_flow_key *key) |
144 | { | |
329f45bc | 145 | key->mac_proto |= SW_FLOW_KEY_INVALID; |
fff06c36 PS |
146 | } |
147 | ||
148 | static bool is_flow_key_valid(const struct sw_flow_key *key) | |
149 | { | |
329f45bc | 150 | return !(key->mac_proto & SW_FLOW_KEY_INVALID); |
fff06c36 PS |
151 | } |
152 | ||
bef7f756 | 153 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, |
154 | struct sw_flow_key *key, | |
155 | u32 recirc_id, | |
156 | const struct nlattr *actions, int len, | |
157 | bool last, bool clone_flow_key); | |
158 | ||
4d5ec89f NS |
159 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
160 | struct sw_flow_key *key, | |
161 | const struct nlattr *attr, int len); | |
162 | ||
fff06c36 | 163 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
f66b53fd | 164 | __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len) |
25cd9ba0 | 165 | { |
8822e270 | 166 | int err; |
25cd9ba0 | 167 | |
f66b53fd | 168 | err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len); |
8822e270 JH |
169 | if (err) |
170 | return err; | |
25cd9ba0 | 171 | |
f66b53fd MV |
172 | if (!mac_len) |
173 | key->mac_proto = MAC_PROTO_NONE; | |
174 | ||
fff06c36 | 175 | invalidate_flow_key(key); |
25cd9ba0 SH |
176 | return 0; |
177 | } | |
178 | ||
fff06c36 PS |
179 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
180 | const __be16 ethertype) | |
25cd9ba0 | 181 | { |
25cd9ba0 SH |
182 | int err; |
183 | ||
040b5cfb MV |
184 | err = skb_mpls_pop(skb, ethertype, skb->mac_len, |
185 | ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET); | |
ed246cee | 186 | if (err) |
25cd9ba0 SH |
187 | return err; |
188 | ||
f66b53fd MV |
189 | if (ethertype == htons(ETH_P_TEB)) |
190 | key->mac_proto = MAC_PROTO_ETHERNET; | |
191 | ||
fff06c36 | 192 | invalidate_flow_key(key); |
25cd9ba0 SH |
193 | return 0; |
194 | } | |
195 | ||
83d2b9ba JR |
196 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key, |
197 | const __be32 *mpls_lse, const __be32 *mask) | |
25cd9ba0 | 198 | { |
85de4a21 | 199 | struct mpls_shim_hdr *stack; |
83d2b9ba | 200 | __be32 lse; |
25cd9ba0 SH |
201 | int err; |
202 | ||
85de4a21 JB |
203 | stack = mpls_hdr(skb); |
204 | lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask); | |
d27cf5c5 JH |
205 | err = skb_mpls_update_lse(skb, lse); |
206 | if (err) | |
207 | return err; | |
25cd9ba0 | 208 | |
fbdcdd78 | 209 | flow_key->mpls.lse[0] = lse; |
25cd9ba0 SH |
210 | return 0; |
211 | } | |
212 | ||
fff06c36 | 213 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e | 214 | { |
ccb1352e JG |
215 | int err; |
216 | ||
93515d53 | 217 | err = skb_vlan_pop(skb); |
018c1dda | 218 | if (skb_vlan_tag_present(skb)) { |
93515d53 | 219 | invalidate_flow_key(key); |
018c1dda EG |
220 | } else { |
221 | key->eth.vlan.tci = 0; | |
222 | key->eth.vlan.tpid = 0; | |
223 | } | |
93515d53 | 224 | return err; |
ccb1352e JG |
225 | } |
226 | ||
fff06c36 PS |
227 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
228 | const struct ovs_action_push_vlan *vlan) | |
ccb1352e | 229 | { |
018c1dda | 230 | if (skb_vlan_tag_present(skb)) { |
fff06c36 | 231 | invalidate_flow_key(key); |
018c1dda EG |
232 | } else { |
233 | key->eth.vlan.tci = vlan->vlan_tci; | |
234 | key->eth.vlan.tpid = vlan->vlan_tpid; | |
235 | } | |
93515d53 | 236 | return skb_vlan_push(skb, vlan->vlan_tpid, |
9df46aef | 237 | ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK); |
ccb1352e JG |
238 | } |
239 | ||
83d2b9ba JR |
240 | /* 'src' is already properly masked. */ |
241 | static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_) | |
242 | { | |
243 | u16 *dst = (u16 *)dst_; | |
244 | const u16 *src = (const u16 *)src_; | |
245 | const u16 *mask = (const u16 *)mask_; | |
246 | ||
be26b9a8 JS |
247 | OVS_SET_MASKED(dst[0], src[0], mask[0]); |
248 | OVS_SET_MASKED(dst[1], src[1], mask[1]); | |
249 | OVS_SET_MASKED(dst[2], src[2], mask[2]); | |
83d2b9ba JR |
250 | } |
251 | ||
252 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
253 | const struct ovs_key_ethernet *key, | |
254 | const struct ovs_key_ethernet *mask) | |
ccb1352e JG |
255 | { |
256 | int err; | |
83d2b9ba | 257 | |
e2195121 | 258 | err = skb_ensure_writable(skb, ETH_HLEN); |
ccb1352e JG |
259 | if (unlikely(err)) |
260 | return err; | |
261 | ||
b34df5e8 PS |
262 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
263 | ||
83d2b9ba JR |
264 | ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src, |
265 | mask->eth_src); | |
266 | ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst, | |
267 | mask->eth_dst); | |
ccb1352e | 268 | |
6b83d28a | 269 | skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
b34df5e8 | 270 | |
83d2b9ba JR |
271 | ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source); |
272 | ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest); | |
ccb1352e JG |
273 | return 0; |
274 | } | |
275 | ||
91820da6 JB |
276 | /* pop_eth does not support VLAN packets as this action is never called |
277 | * for them. | |
278 | */ | |
279 | static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key) | |
280 | { | |
281 | skb_pull_rcsum(skb, ETH_HLEN); | |
282 | skb_reset_mac_header(skb); | |
283 | skb_reset_mac_len(skb); | |
284 | ||
285 | /* safe right before invalidate_flow_key */ | |
286 | key->mac_proto = MAC_PROTO_NONE; | |
287 | invalidate_flow_key(key); | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static int push_eth(struct sk_buff *skb, struct sw_flow_key *key, | |
292 | const struct ovs_action_push_eth *ethh) | |
293 | { | |
294 | struct ethhdr *hdr; | |
295 | ||
296 | /* Add the new Ethernet header */ | |
297 | if (skb_cow_head(skb, ETH_HLEN) < 0) | |
298 | return -ENOMEM; | |
299 | ||
300 | skb_push(skb, ETH_HLEN); | |
301 | skb_reset_mac_header(skb); | |
302 | skb_reset_mac_len(skb); | |
303 | ||
304 | hdr = eth_hdr(skb); | |
305 | ether_addr_copy(hdr->h_source, ethh->addresses.eth_src); | |
306 | ether_addr_copy(hdr->h_dest, ethh->addresses.eth_dst); | |
307 | hdr->h_proto = skb->protocol; | |
308 | ||
309 | skb_postpush_rcsum(skb, hdr, ETH_HLEN); | |
310 | ||
311 | /* safe right before invalidate_flow_key */ | |
312 | key->mac_proto = MAC_PROTO_ETHERNET; | |
313 | invalidate_flow_key(key); | |
314 | return 0; | |
315 | } | |
316 | ||
b2d0f5d5 YY |
317 | static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key, |
318 | const struct nshhdr *nh) | |
319 | { | |
320 | int err; | |
321 | ||
322 | err = nsh_push(skb, nh); | |
323 | if (err) | |
324 | return err; | |
325 | ||
326 | /* safe right before invalidate_flow_key */ | |
327 | key->mac_proto = MAC_PROTO_NONE; | |
328 | invalidate_flow_key(key); | |
329 | return 0; | |
330 | } | |
331 | ||
332 | static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key) | |
333 | { | |
334 | int err; | |
335 | ||
336 | err = nsh_pop(skb); | |
337 | if (err) | |
338 | return err; | |
339 | ||
340 | /* safe right before invalidate_flow_key */ | |
341 | if (skb->protocol == htons(ETH_P_TEB)) | |
342 | key->mac_proto = MAC_PROTO_ETHERNET; | |
343 | else | |
344 | key->mac_proto = MAC_PROTO_NONE; | |
345 | invalidate_flow_key(key); | |
346 | return 0; | |
347 | } | |
348 | ||
3576fd79 GG |
349 | static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh, |
350 | __be32 addr, __be32 new_addr) | |
ccb1352e JG |
351 | { |
352 | int transport_len = skb->len - skb_transport_offset(skb); | |
353 | ||
3576fd79 GG |
354 | if (nh->frag_off & htons(IP_OFFSET)) |
355 | return; | |
356 | ||
ccb1352e JG |
357 | if (nh->protocol == IPPROTO_TCP) { |
358 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
359 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, | |
4b048d6d | 360 | addr, new_addr, true); |
ccb1352e | 361 | } else if (nh->protocol == IPPROTO_UDP) { |
81e5d41d JG |
362 | if (likely(transport_len >= sizeof(struct udphdr))) { |
363 | struct udphdr *uh = udp_hdr(skb); | |
364 | ||
365 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
366 | inet_proto_csum_replace4(&uh->check, skb, | |
4b048d6d | 367 | addr, new_addr, true); |
81e5d41d JG |
368 | if (!uh->check) |
369 | uh->check = CSUM_MANGLED_0; | |
370 | } | |
371 | } | |
ccb1352e | 372 | } |
3576fd79 | 373 | } |
ccb1352e | 374 | |
3576fd79 GG |
375 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
376 | __be32 *addr, __be32 new_addr) | |
377 | { | |
378 | update_ip_l4_checksum(skb, nh, *addr, new_addr); | |
ccb1352e | 379 | csum_replace4(&nh->check, *addr, new_addr); |
7539fadc | 380 | skb_clear_hash(skb); |
ccb1352e JG |
381 | *addr = new_addr; |
382 | } | |
383 | ||
3fdbd1ce AA |
384 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
385 | __be32 addr[4], const __be32 new_addr[4]) | |
386 | { | |
387 | int transport_len = skb->len - skb_transport_offset(skb); | |
388 | ||
856447d0 | 389 | if (l4_proto == NEXTHDR_TCP) { |
3fdbd1ce AA |
390 | if (likely(transport_len >= sizeof(struct tcphdr))) |
391 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
4b048d6d | 392 | addr, new_addr, true); |
856447d0 | 393 | } else if (l4_proto == NEXTHDR_UDP) { |
3fdbd1ce AA |
394 | if (likely(transport_len >= sizeof(struct udphdr))) { |
395 | struct udphdr *uh = udp_hdr(skb); | |
396 | ||
397 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
398 | inet_proto_csum_replace16(&uh->check, skb, | |
4b048d6d | 399 | addr, new_addr, true); |
3fdbd1ce AA |
400 | if (!uh->check) |
401 | uh->check = CSUM_MANGLED_0; | |
402 | } | |
403 | } | |
856447d0 JG |
404 | } else if (l4_proto == NEXTHDR_ICMP) { |
405 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
406 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
4b048d6d | 407 | skb, addr, new_addr, true); |
3fdbd1ce AA |
408 | } |
409 | } | |
410 | ||
83d2b9ba JR |
411 | static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4], |
412 | const __be32 mask[4], __be32 masked[4]) | |
413 | { | |
be26b9a8 JS |
414 | masked[0] = OVS_MASKED(old[0], addr[0], mask[0]); |
415 | masked[1] = OVS_MASKED(old[1], addr[1], mask[1]); | |
416 | masked[2] = OVS_MASKED(old[2], addr[2], mask[2]); | |
417 | masked[3] = OVS_MASKED(old[3], addr[3], mask[3]); | |
83d2b9ba JR |
418 | } |
419 | ||
3fdbd1ce AA |
420 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, |
421 | __be32 addr[4], const __be32 new_addr[4], | |
422 | bool recalculate_csum) | |
423 | { | |
424 | if (recalculate_csum) | |
425 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); | |
426 | ||
7539fadc | 427 | skb_clear_hash(skb); |
3fdbd1ce AA |
428 | memcpy(addr, new_addr, sizeof(__be32[4])); |
429 | } | |
430 | ||
83d2b9ba | 431 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask) |
3fdbd1ce | 432 | { |
83d2b9ba | 433 | /* Bits 21-24 are always unmasked, so this retains their values. */ |
be26b9a8 JS |
434 | OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16)); |
435 | OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8)); | |
436 | OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask); | |
3fdbd1ce AA |
437 | } |
438 | ||
83d2b9ba JR |
439 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl, |
440 | u8 mask) | |
3fdbd1ce | 441 | { |
be26b9a8 | 442 | new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask); |
3fdbd1ce | 443 | |
ccb1352e JG |
444 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); |
445 | nh->ttl = new_ttl; | |
446 | } | |
447 | ||
83d2b9ba JR |
448 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key, |
449 | const struct ovs_key_ipv4 *key, | |
450 | const struct ovs_key_ipv4 *mask) | |
ccb1352e JG |
451 | { |
452 | struct iphdr *nh; | |
83d2b9ba | 453 | __be32 new_addr; |
ccb1352e JG |
454 | int err; |
455 | ||
e2195121 JP |
456 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
457 | sizeof(struct iphdr)); | |
ccb1352e JG |
458 | if (unlikely(err)) |
459 | return err; | |
460 | ||
461 | nh = ip_hdr(skb); | |
462 | ||
83d2b9ba JR |
463 | /* Setting an IP addresses is typically only a side effect of |
464 | * matching on them in the current userspace implementation, so it | |
465 | * makes sense to check if the value actually changed. | |
466 | */ | |
467 | if (mask->ipv4_src) { | |
be26b9a8 | 468 | new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src); |
ccb1352e | 469 | |
83d2b9ba JR |
470 | if (unlikely(new_addr != nh->saddr)) { |
471 | set_ip_addr(skb, nh, &nh->saddr, new_addr); | |
472 | flow_key->ipv4.addr.src = new_addr; | |
473 | } | |
fff06c36 | 474 | } |
83d2b9ba | 475 | if (mask->ipv4_dst) { |
be26b9a8 | 476 | new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst); |
ccb1352e | 477 | |
83d2b9ba JR |
478 | if (unlikely(new_addr != nh->daddr)) { |
479 | set_ip_addr(skb, nh, &nh->daddr, new_addr); | |
480 | flow_key->ipv4.addr.dst = new_addr; | |
481 | } | |
fff06c36 | 482 | } |
83d2b9ba JR |
483 | if (mask->ipv4_tos) { |
484 | ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos); | |
485 | flow_key->ip.tos = nh->tos; | |
486 | } | |
487 | if (mask->ipv4_ttl) { | |
488 | set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl); | |
489 | flow_key->ip.ttl = nh->ttl; | |
fff06c36 | 490 | } |
ccb1352e JG |
491 | |
492 | return 0; | |
493 | } | |
494 | ||
83d2b9ba JR |
495 | static bool is_ipv6_mask_nonzero(const __be32 addr[4]) |
496 | { | |
497 | return !!(addr[0] | addr[1] | addr[2] | addr[3]); | |
498 | } | |
499 | ||
500 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
501 | const struct ovs_key_ipv6 *key, | |
502 | const struct ovs_key_ipv6 *mask) | |
3fdbd1ce AA |
503 | { |
504 | struct ipv6hdr *nh; | |
505 | int err; | |
3fdbd1ce | 506 | |
e2195121 JP |
507 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
508 | sizeof(struct ipv6hdr)); | |
3fdbd1ce AA |
509 | if (unlikely(err)) |
510 | return err; | |
511 | ||
512 | nh = ipv6_hdr(skb); | |
3fdbd1ce | 513 | |
83d2b9ba JR |
514 | /* Setting an IP addresses is typically only a side effect of |
515 | * matching on them in the current userspace implementation, so it | |
516 | * makes sense to check if the value actually changed. | |
517 | */ | |
518 | if (is_ipv6_mask_nonzero(mask->ipv6_src)) { | |
519 | __be32 *saddr = (__be32 *)&nh->saddr; | |
520 | __be32 masked[4]; | |
521 | ||
522 | mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked); | |
523 | ||
524 | if (unlikely(memcmp(saddr, masked, sizeof(masked)))) { | |
b4f70527 | 525 | set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked, |
83d2b9ba JR |
526 | true); |
527 | memcpy(&flow_key->ipv6.addr.src, masked, | |
528 | sizeof(flow_key->ipv6.addr.src)); | |
529 | } | |
530 | } | |
531 | if (is_ipv6_mask_nonzero(mask->ipv6_dst)) { | |
3fdbd1ce AA |
532 | unsigned int offset = 0; |
533 | int flags = IP6_FH_F_SKIP_RH; | |
534 | bool recalc_csum = true; | |
83d2b9ba JR |
535 | __be32 *daddr = (__be32 *)&nh->daddr; |
536 | __be32 masked[4]; | |
537 | ||
538 | mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked); | |
539 | ||
540 | if (unlikely(memcmp(daddr, masked, sizeof(masked)))) { | |
541 | if (ipv6_ext_hdr(nh->nexthdr)) | |
542 | recalc_csum = (ipv6_find_hdr(skb, &offset, | |
543 | NEXTHDR_ROUTING, | |
544 | NULL, &flags) | |
545 | != NEXTHDR_ROUTING); | |
546 | ||
b4f70527 | 547 | set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked, |
83d2b9ba JR |
548 | recalc_csum); |
549 | memcpy(&flow_key->ipv6.addr.dst, masked, | |
550 | sizeof(flow_key->ipv6.addr.dst)); | |
551 | } | |
552 | } | |
553 | if (mask->ipv6_tclass) { | |
554 | ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass); | |
555 | flow_key->ip.tos = ipv6_get_dsfield(nh); | |
556 | } | |
557 | if (mask->ipv6_label) { | |
558 | set_ipv6_fl(nh, ntohl(key->ipv6_label), | |
559 | ntohl(mask->ipv6_label)); | |
560 | flow_key->ipv6.label = | |
561 | *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
562 | } | |
563 | if (mask->ipv6_hlimit) { | |
be26b9a8 JS |
564 | OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit, |
565 | mask->ipv6_hlimit); | |
83d2b9ba | 566 | flow_key->ip.ttl = nh->hop_limit; |
3fdbd1ce | 567 | } |
3fdbd1ce AA |
568 | return 0; |
569 | } | |
570 | ||
b2d0f5d5 YY |
571 | static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key, |
572 | const struct nlattr *a) | |
573 | { | |
574 | struct nshhdr *nh; | |
575 | size_t length; | |
576 | int err; | |
577 | u8 flags; | |
578 | u8 ttl; | |
579 | int i; | |
580 | ||
581 | struct ovs_key_nsh key; | |
582 | struct ovs_key_nsh mask; | |
583 | ||
584 | err = nsh_key_from_nlattr(a, &key, &mask); | |
585 | if (err) | |
586 | return err; | |
587 | ||
588 | /* Make sure the NSH base header is there */ | |
589 | if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN)) | |
590 | return -ENOMEM; | |
591 | ||
592 | nh = nsh_hdr(skb); | |
593 | length = nsh_hdr_len(nh); | |
594 | ||
595 | /* Make sure the whole NSH header is there */ | |
596 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
597 | length); | |
598 | if (unlikely(err)) | |
599 | return err; | |
600 | ||
601 | nh = nsh_hdr(skb); | |
602 | skb_postpull_rcsum(skb, nh, length); | |
603 | flags = nsh_get_flags(nh); | |
604 | flags = OVS_MASKED(flags, key.base.flags, mask.base.flags); | |
605 | flow_key->nsh.base.flags = flags; | |
606 | ttl = nsh_get_ttl(nh); | |
607 | ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl); | |
608 | flow_key->nsh.base.ttl = ttl; | |
609 | nsh_set_flags_and_ttl(nh, flags, ttl); | |
610 | nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr, | |
611 | mask.base.path_hdr); | |
612 | flow_key->nsh.base.path_hdr = nh->path_hdr; | |
613 | switch (nh->mdtype) { | |
614 | case NSH_M_TYPE1: | |
615 | for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) { | |
616 | nh->md1.context[i] = | |
617 | OVS_MASKED(nh->md1.context[i], key.context[i], | |
618 | mask.context[i]); | |
619 | } | |
620 | memcpy(flow_key->nsh.context, nh->md1.context, | |
621 | sizeof(nh->md1.context)); | |
622 | break; | |
623 | case NSH_M_TYPE2: | |
624 | memset(flow_key->nsh.context, 0, | |
625 | sizeof(flow_key->nsh.context)); | |
626 | break; | |
627 | default: | |
628 | return -EINVAL; | |
629 | } | |
630 | skb_postpush_rcsum(skb, nh, length); | |
631 | return 0; | |
632 | } | |
633 | ||
e2195121 | 634 | /* Must follow skb_ensure_writable() since that can move the skb data. */ |
ccb1352e | 635 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
83d2b9ba | 636 | __be16 new_port, __sum16 *check) |
ccb1352e | 637 | { |
4b048d6d | 638 | inet_proto_csum_replace2(check, skb, *port, new_port, false); |
ccb1352e | 639 | *port = new_port; |
81e5d41d JG |
640 | } |
641 | ||
83d2b9ba JR |
642 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
643 | const struct ovs_key_udp *key, | |
644 | const struct ovs_key_udp *mask) | |
ccb1352e JG |
645 | { |
646 | struct udphdr *uh; | |
83d2b9ba | 647 | __be16 src, dst; |
ccb1352e JG |
648 | int err; |
649 | ||
e2195121 JP |
650 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
651 | sizeof(struct udphdr)); | |
ccb1352e JG |
652 | if (unlikely(err)) |
653 | return err; | |
654 | ||
655 | uh = udp_hdr(skb); | |
83d2b9ba | 656 | /* Either of the masks is non-zero, so do not bother checking them. */ |
be26b9a8 JS |
657 | src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src); |
658 | dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst); | |
ccb1352e | 659 | |
83d2b9ba JR |
660 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
661 | if (likely(src != uh->source)) { | |
662 | set_tp_port(skb, &uh->source, src, &uh->check); | |
663 | flow_key->tp.src = src; | |
664 | } | |
665 | if (likely(dst != uh->dest)) { | |
666 | set_tp_port(skb, &uh->dest, dst, &uh->check); | |
667 | flow_key->tp.dst = dst; | |
668 | } | |
669 | ||
670 | if (unlikely(!uh->check)) | |
671 | uh->check = CSUM_MANGLED_0; | |
672 | } else { | |
673 | uh->source = src; | |
674 | uh->dest = dst; | |
675 | flow_key->tp.src = src; | |
676 | flow_key->tp.dst = dst; | |
fff06c36 | 677 | } |
ccb1352e | 678 | |
83d2b9ba JR |
679 | skb_clear_hash(skb); |
680 | ||
ccb1352e JG |
681 | return 0; |
682 | } | |
683 | ||
83d2b9ba JR |
684 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
685 | const struct ovs_key_tcp *key, | |
686 | const struct ovs_key_tcp *mask) | |
ccb1352e JG |
687 | { |
688 | struct tcphdr *th; | |
83d2b9ba | 689 | __be16 src, dst; |
ccb1352e JG |
690 | int err; |
691 | ||
e2195121 JP |
692 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
693 | sizeof(struct tcphdr)); | |
ccb1352e JG |
694 | if (unlikely(err)) |
695 | return err; | |
696 | ||
697 | th = tcp_hdr(skb); | |
be26b9a8 | 698 | src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src); |
83d2b9ba JR |
699 | if (likely(src != th->source)) { |
700 | set_tp_port(skb, &th->source, src, &th->check); | |
701 | flow_key->tp.src = src; | |
fff06c36 | 702 | } |
be26b9a8 | 703 | dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst); |
83d2b9ba JR |
704 | if (likely(dst != th->dest)) { |
705 | set_tp_port(skb, &th->dest, dst, &th->check); | |
706 | flow_key->tp.dst = dst; | |
fff06c36 | 707 | } |
83d2b9ba | 708 | skb_clear_hash(skb); |
ccb1352e JG |
709 | |
710 | return 0; | |
711 | } | |
712 | ||
83d2b9ba JR |
713 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
714 | const struct ovs_key_sctp *key, | |
715 | const struct ovs_key_sctp *mask) | |
a175a723 | 716 | { |
83d2b9ba | 717 | unsigned int sctphoff = skb_transport_offset(skb); |
a175a723 | 718 | struct sctphdr *sh; |
83d2b9ba | 719 | __le32 old_correct_csum, new_csum, old_csum; |
a175a723 | 720 | int err; |
a175a723 | 721 | |
e2195121 | 722 | err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr)); |
a175a723 JS |
723 | if (unlikely(err)) |
724 | return err; | |
725 | ||
726 | sh = sctp_hdr(skb); | |
83d2b9ba JR |
727 | old_csum = sh->checksum; |
728 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
a175a723 | 729 | |
be26b9a8 JS |
730 | sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src); |
731 | sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst); | |
a175a723 | 732 | |
83d2b9ba | 733 | new_csum = sctp_compute_cksum(skb, sctphoff); |
a175a723 | 734 | |
83d2b9ba JR |
735 | /* Carry any checksum errors through. */ |
736 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
a175a723 | 737 | |
83d2b9ba JR |
738 | skb_clear_hash(skb); |
739 | flow_key->tp.src = sh->source; | |
740 | flow_key->tp.dst = sh->dest; | |
a175a723 JS |
741 | |
742 | return 0; | |
743 | } | |
744 | ||
188515fb | 745 | static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
7f8a436e JS |
746 | { |
747 | struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage); | |
748 | struct vport *vport = data->vport; | |
749 | ||
750 | if (skb_cow_head(skb, data->l2_len) < 0) { | |
751 | kfree_skb(skb); | |
752 | return -ENOMEM; | |
753 | } | |
754 | ||
755 | __skb_dst_copy(skb, data->dst); | |
756 | *OVS_CB(skb) = data->cb; | |
757 | skb->inner_protocol = data->inner_protocol; | |
9df46aef MM |
758 | if (data->vlan_tci & VLAN_CFI_MASK) |
759 | __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK); | |
760 | else | |
761 | __vlan_hwaccel_clear_tag(skb); | |
7f8a436e JS |
762 | |
763 | /* Reconstruct the MAC header. */ | |
764 | skb_push(skb, data->l2_len); | |
765 | memcpy(skb->data, &data->l2_data, data->l2_len); | |
6b83d28a | 766 | skb_postpush_rcsum(skb, skb->data, data->l2_len); |
7f8a436e JS |
767 | skb_reset_mac_header(skb); |
768 | ||
c66549ff JB |
769 | if (eth_p_mpls(skb->protocol)) { |
770 | skb->inner_network_header = skb->network_header; | |
771 | skb_set_network_header(skb, data->network_offset); | |
772 | skb_reset_mac_len(skb); | |
773 | } | |
774 | ||
e2d9d835 | 775 | ovs_vport_send(vport, skb, data->mac_proto); |
7f8a436e JS |
776 | return 0; |
777 | } | |
778 | ||
779 | static unsigned int | |
780 | ovs_dst_get_mtu(const struct dst_entry *dst) | |
781 | { | |
782 | return dst->dev->mtu; | |
783 | } | |
784 | ||
785 | static struct dst_ops ovs_dst_ops = { | |
786 | .family = AF_UNSPEC, | |
787 | .mtu = ovs_dst_get_mtu, | |
788 | }; | |
789 | ||
790 | /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is | |
791 | * ovs_vport_output(), which is called once per fragmented packet. | |
792 | */ | |
c66549ff | 793 | static void prepare_frag(struct vport *vport, struct sk_buff *skb, |
e2d9d835 | 794 | u16 orig_network_offset, u8 mac_proto) |
7f8a436e JS |
795 | { |
796 | unsigned int hlen = skb_network_offset(skb); | |
797 | struct ovs_frag_data *data; | |
798 | ||
799 | data = this_cpu_ptr(&ovs_frag_data_storage); | |
800 | data->dst = skb->_skb_refdst; | |
801 | data->vport = vport; | |
802 | data->cb = *OVS_CB(skb); | |
803 | data->inner_protocol = skb->inner_protocol; | |
c66549ff | 804 | data->network_offset = orig_network_offset; |
9df46aef MM |
805 | if (skb_vlan_tag_present(skb)) |
806 | data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK; | |
807 | else | |
808 | data->vlan_tci = 0; | |
7f8a436e | 809 | data->vlan_proto = skb->vlan_proto; |
e2d9d835 | 810 | data->mac_proto = mac_proto; |
7f8a436e JS |
811 | data->l2_len = hlen; |
812 | memcpy(&data->l2_data, skb->data, hlen); | |
813 | ||
814 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
815 | skb_pull(skb, hlen); | |
816 | } | |
817 | ||
c559cd3a | 818 | static void ovs_fragment(struct net *net, struct vport *vport, |
e2d9d835 JB |
819 | struct sk_buff *skb, u16 mru, |
820 | struct sw_flow_key *key) | |
7f8a436e | 821 | { |
c66549ff JB |
822 | u16 orig_network_offset = 0; |
823 | ||
824 | if (eth_p_mpls(skb->protocol)) { | |
825 | orig_network_offset = skb_network_offset(skb); | |
826 | skb->network_header = skb->inner_network_header; | |
827 | } | |
828 | ||
7f8a436e JS |
829 | if (skb_network_offset(skb) > MAX_L2_LEN) { |
830 | OVS_NLERR(1, "L2 header too long to fragment"); | |
b8f22570 | 831 | goto err; |
7f8a436e JS |
832 | } |
833 | ||
e2d9d835 | 834 | if (key->eth.type == htons(ETH_P_IP)) { |
7f8a436e JS |
835 | struct dst_entry ovs_dst; |
836 | unsigned long orig_dst; | |
837 | ||
e2d9d835 JB |
838 | prepare_frag(vport, skb, orig_network_offset, |
839 | ovs_key_mac_proto(key)); | |
7f8a436e JS |
840 | dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1, |
841 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
842 | ovs_dst.dev = vport->dev; | |
843 | ||
844 | orig_dst = skb->_skb_refdst; | |
845 | skb_dst_set_noref(skb, &ovs_dst); | |
846 | IPCB(skb)->frag_max_size = mru; | |
847 | ||
694869b3 | 848 | ip_do_fragment(net, skb->sk, skb, ovs_vport_output); |
7f8a436e | 849 | refdst_drop(orig_dst); |
e2d9d835 | 850 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
7f8a436e JS |
851 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); |
852 | unsigned long orig_dst; | |
853 | struct rt6_info ovs_rt; | |
854 | ||
f1304f7b | 855 | if (!v6ops) |
b8f22570 | 856 | goto err; |
7f8a436e | 857 | |
e2d9d835 JB |
858 | prepare_frag(vport, skb, orig_network_offset, |
859 | ovs_key_mac_proto(key)); | |
7f8a436e JS |
860 | memset(&ovs_rt, 0, sizeof(ovs_rt)); |
861 | dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1, | |
862 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
863 | ovs_rt.dst.dev = vport->dev; | |
864 | ||
865 | orig_dst = skb->_skb_refdst; | |
866 | skb_dst_set_noref(skb, &ovs_rt.dst); | |
867 | IP6CB(skb)->frag_max_size = mru; | |
868 | ||
7d8c6e39 | 869 | v6ops->fragment(net, skb->sk, skb, ovs_vport_output); |
7f8a436e JS |
870 | refdst_drop(orig_dst); |
871 | } else { | |
872 | WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.", | |
e2d9d835 | 873 | ovs_vport_name(vport), ntohs(key->eth.type), mru, |
7f8a436e | 874 | vport->dev->mtu); |
b8f22570 | 875 | goto err; |
7f8a436e | 876 | } |
b8f22570 JS |
877 | |
878 | return; | |
879 | err: | |
880 | kfree_skb(skb); | |
7f8a436e JS |
881 | } |
882 | ||
883 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port, | |
884 | struct sw_flow_key *key) | |
ccb1352e | 885 | { |
738967b8 | 886 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
ccb1352e | 887 | |
7f8a436e JS |
888 | if (likely(vport)) { |
889 | u16 mru = OVS_CB(skb)->mru; | |
f2a4d086 WT |
890 | u32 cutlen = OVS_CB(skb)->cutlen; |
891 | ||
892 | if (unlikely(cutlen > 0)) { | |
e2d9d835 | 893 | if (skb->len - cutlen > ovs_mac_header_len(key)) |
f2a4d086 WT |
894 | pskb_trim(skb, skb->len - cutlen); |
895 | else | |
e2d9d835 | 896 | pskb_trim(skb, ovs_mac_header_len(key)); |
f2a4d086 | 897 | } |
7f8a436e | 898 | |
738314a0 JB |
899 | if (likely(!mru || |
900 | (skb->len <= mru + vport->dev->hard_header_len))) { | |
e2d9d835 | 901 | ovs_vport_send(vport, skb, ovs_key_mac_proto(key)); |
7f8a436e | 902 | } else if (mru <= vport->dev->mtu) { |
c559cd3a | 903 | struct net *net = read_pnet(&dp->net); |
7f8a436e | 904 | |
e2d9d835 | 905 | ovs_fragment(net, vport, skb, mru, key); |
7f8a436e JS |
906 | } else { |
907 | kfree_skb(skb); | |
908 | } | |
909 | } else { | |
ccb1352e | 910 | kfree_skb(skb); |
7f8a436e | 911 | } |
ccb1352e JG |
912 | } |
913 | ||
914 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, | |
ccea7445 | 915 | struct sw_flow_key *key, const struct nlattr *attr, |
f2a4d086 WT |
916 | const struct nlattr *actions, int actions_len, |
917 | uint32_t cutlen) | |
ccb1352e JG |
918 | { |
919 | struct dp_upcall_info upcall; | |
920 | const struct nlattr *a; | |
921 | int rem; | |
922 | ||
ccea7445 | 923 | memset(&upcall, 0, sizeof(upcall)); |
ccb1352e | 924 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
7f8a436e | 925 | upcall.mru = OVS_CB(skb)->mru; |
ccb1352e JG |
926 | |
927 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
928 | a = nla_next(a, &rem)) { | |
929 | switch (nla_type(a)) { | |
930 | case OVS_USERSPACE_ATTR_USERDATA: | |
931 | upcall.userdata = a; | |
932 | break; | |
933 | ||
934 | case OVS_USERSPACE_ATTR_PID: | |
15e47304 | 935 | upcall.portid = nla_get_u32(a); |
ccb1352e | 936 | break; |
8f0aad6f WZ |
937 | |
938 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
939 | /* Get out tunnel info. */ | |
940 | struct vport *vport; | |
941 | ||
942 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
943 | if (vport) { | |
944 | int err; | |
945 | ||
fc4099f1 PS |
946 | err = dev_fill_metadata_dst(vport->dev, skb); |
947 | if (!err) | |
948 | upcall.egress_tun_info = skb_tunnel_info(skb); | |
8f0aad6f | 949 | } |
4c222798 | 950 | |
8f0aad6f | 951 | break; |
ccb1352e | 952 | } |
8f0aad6f | 953 | |
ccea7445 NM |
954 | case OVS_USERSPACE_ATTR_ACTIONS: { |
955 | /* Include actions. */ | |
956 | upcall.actions = actions; | |
957 | upcall.actions_len = actions_len; | |
958 | break; | |
959 | } | |
960 | ||
8f0aad6f | 961 | } /* End of switch. */ |
ccb1352e JG |
962 | } |
963 | ||
f2a4d086 | 964 | return ovs_dp_upcall(dp, skb, key, &upcall, cutlen); |
ccb1352e JG |
965 | } |
966 | ||
744676e7 MC |
967 | static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb, |
968 | struct sw_flow_key *key, | |
969 | const struct nlattr *attr, bool last) | |
970 | { | |
971 | /* The first action is always 'OVS_DEC_TTL_ATTR_ARG'. */ | |
972 | struct nlattr *dec_ttl_arg = nla_data(attr); | |
973 | int rem = nla_len(attr); | |
974 | ||
975 | if (nla_len(dec_ttl_arg)) { | |
976 | struct nlattr *actions = nla_next(dec_ttl_arg, &rem); | |
977 | ||
978 | if (actions) | |
979 | return clone_execute(dp, skb, key, 0, actions, rem, | |
980 | last, false); | |
981 | } | |
982 | consume_skb(skb); | |
983 | return 0; | |
984 | } | |
985 | ||
798c1661 | 986 | /* When 'last' is true, sample() should always consume the 'skb'. |
987 | * Otherwise, sample() should keep 'skb' intact regardless what | |
988 | * actions are executed within sample(). | |
989 | */ | |
ccb1352e | 990 | static int sample(struct datapath *dp, struct sk_buff *skb, |
ccea7445 | 991 | struct sw_flow_key *key, const struct nlattr *attr, |
798c1661 | 992 | bool last) |
ccb1352e | 993 | { |
798c1661 | 994 | struct nlattr *actions; |
995 | struct nlattr *sample_arg; | |
798c1661 | 996 | int rem = nla_len(attr); |
798c1661 | 997 | const struct sample_arg *arg; |
bef7f756 | 998 | bool clone_flow_key; |
ccb1352e | 999 | |
798c1661 | 1000 | /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */ |
1001 | sample_arg = nla_data(attr); | |
1002 | arg = nla_data(sample_arg); | |
1003 | actions = nla_next(sample_arg, &rem); | |
e05176a3 | 1004 | |
798c1661 | 1005 | if ((arg->probability != U32_MAX) && |
1006 | (!arg->probability || prandom_u32() > arg->probability)) { | |
1007 | if (last) | |
1008 | consume_skb(skb); | |
1009 | return 0; | |
ccb1352e JG |
1010 | } |
1011 | ||
bef7f756 | 1012 | clone_flow_key = !arg->exec; |
1013 | return clone_execute(dp, skb, key, 0, actions, rem, last, | |
1014 | clone_flow_key); | |
971427f3 AZ |
1015 | } |
1016 | ||
b2335040 YS |
1017 | /* When 'last' is true, clone() should always consume the 'skb'. |
1018 | * Otherwise, clone() should keep 'skb' intact regardless what | |
1019 | * actions are executed within clone(). | |
1020 | */ | |
1021 | static int clone(struct datapath *dp, struct sk_buff *skb, | |
1022 | struct sw_flow_key *key, const struct nlattr *attr, | |
1023 | bool last) | |
1024 | { | |
1025 | struct nlattr *actions; | |
1026 | struct nlattr *clone_arg; | |
1027 | int rem = nla_len(attr); | |
1028 | bool dont_clone_flow_key; | |
1029 | ||
1030 | /* The first action is always 'OVS_CLONE_ATTR_ARG'. */ | |
1031 | clone_arg = nla_data(attr); | |
1032 | dont_clone_flow_key = nla_get_u32(clone_arg); | |
1033 | actions = nla_next(clone_arg, &rem); | |
1034 | ||
1035 | return clone_execute(dp, skb, key, 0, actions, rem, last, | |
1036 | !dont_clone_flow_key); | |
1037 | } | |
1038 | ||
971427f3 AZ |
1039 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, |
1040 | const struct nlattr *attr) | |
1041 | { | |
1042 | struct ovs_action_hash *hash_act = nla_data(attr); | |
1043 | u32 hash = 0; | |
1044 | ||
1045 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
1046 | hash = skb_get_hash(skb); | |
1047 | hash = jhash_1word(hash, hash_act->hash_basis); | |
1048 | if (!hash) | |
1049 | hash = 0x1; | |
1050 | ||
1051 | key->ovs_flow_hash = hash; | |
ccb1352e JG |
1052 | } |
1053 | ||
83d2b9ba JR |
1054 | static int execute_set_action(struct sk_buff *skb, |
1055 | struct sw_flow_key *flow_key, | |
1056 | const struct nlattr *a) | |
1057 | { | |
1058 | /* Only tunnel set execution is supported without a mask. */ | |
1059 | if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) { | |
34ae932a TG |
1060 | struct ovs_tunnel_info *tun = nla_data(a); |
1061 | ||
1062 | skb_dst_drop(skb); | |
1063 | dst_hold((struct dst_entry *)tun->tun_dst); | |
1064 | skb_dst_set(skb, (struct dst_entry *)tun->tun_dst); | |
83d2b9ba JR |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | return -EINVAL; | |
1069 | } | |
1070 | ||
1071 | /* Mask is at the midpoint of the data. */ | |
1072 | #define get_mask(a, type) ((const type)nla_data(a) + 1) | |
1073 | ||
1074 | static int execute_masked_set_action(struct sk_buff *skb, | |
1075 | struct sw_flow_key *flow_key, | |
1076 | const struct nlattr *a) | |
ccb1352e JG |
1077 | { |
1078 | int err = 0; | |
1079 | ||
83d2b9ba | 1080 | switch (nla_type(a)) { |
ccb1352e | 1081 | case OVS_KEY_ATTR_PRIORITY: |
be26b9a8 JS |
1082 | OVS_SET_MASKED(skb->priority, nla_get_u32(a), |
1083 | *get_mask(a, u32 *)); | |
83d2b9ba | 1084 | flow_key->phy.priority = skb->priority; |
ccb1352e JG |
1085 | break; |
1086 | ||
39c7caeb | 1087 | case OVS_KEY_ATTR_SKB_MARK: |
be26b9a8 | 1088 | OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *)); |
83d2b9ba | 1089 | flow_key->phy.skb_mark = skb->mark; |
39c7caeb AA |
1090 | break; |
1091 | ||
f0b128c1 | 1092 | case OVS_KEY_ATTR_TUNNEL_INFO: |
83d2b9ba JR |
1093 | /* Masked data not supported for tunnel. */ |
1094 | err = -EINVAL; | |
7d5437c7 PS |
1095 | break; |
1096 | ||
ccb1352e | 1097 | case OVS_KEY_ATTR_ETHERNET: |
83d2b9ba JR |
1098 | err = set_eth_addr(skb, flow_key, nla_data(a), |
1099 | get_mask(a, struct ovs_key_ethernet *)); | |
ccb1352e JG |
1100 | break; |
1101 | ||
b2d0f5d5 YY |
1102 | case OVS_KEY_ATTR_NSH: |
1103 | err = set_nsh(skb, flow_key, a); | |
1104 | break; | |
1105 | ||
ccb1352e | 1106 | case OVS_KEY_ATTR_IPV4: |
83d2b9ba JR |
1107 | err = set_ipv4(skb, flow_key, nla_data(a), |
1108 | get_mask(a, struct ovs_key_ipv4 *)); | |
ccb1352e JG |
1109 | break; |
1110 | ||
3fdbd1ce | 1111 | case OVS_KEY_ATTR_IPV6: |
83d2b9ba JR |
1112 | err = set_ipv6(skb, flow_key, nla_data(a), |
1113 | get_mask(a, struct ovs_key_ipv6 *)); | |
3fdbd1ce AA |
1114 | break; |
1115 | ||
ccb1352e | 1116 | case OVS_KEY_ATTR_TCP: |
83d2b9ba JR |
1117 | err = set_tcp(skb, flow_key, nla_data(a), |
1118 | get_mask(a, struct ovs_key_tcp *)); | |
ccb1352e JG |
1119 | break; |
1120 | ||
1121 | case OVS_KEY_ATTR_UDP: | |
83d2b9ba JR |
1122 | err = set_udp(skb, flow_key, nla_data(a), |
1123 | get_mask(a, struct ovs_key_udp *)); | |
ccb1352e | 1124 | break; |
a175a723 JS |
1125 | |
1126 | case OVS_KEY_ATTR_SCTP: | |
83d2b9ba JR |
1127 | err = set_sctp(skb, flow_key, nla_data(a), |
1128 | get_mask(a, struct ovs_key_sctp *)); | |
a175a723 | 1129 | break; |
25cd9ba0 SH |
1130 | |
1131 | case OVS_KEY_ATTR_MPLS: | |
83d2b9ba JR |
1132 | err = set_mpls(skb, flow_key, nla_data(a), get_mask(a, |
1133 | __be32 *)); | |
25cd9ba0 | 1134 | break; |
7f8a436e JS |
1135 | |
1136 | case OVS_KEY_ATTR_CT_STATE: | |
1137 | case OVS_KEY_ATTR_CT_ZONE: | |
182e3042 | 1138 | case OVS_KEY_ATTR_CT_MARK: |
33db4125 | 1139 | case OVS_KEY_ATTR_CT_LABELS: |
9dd7f890 JR |
1140 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4: |
1141 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6: | |
7f8a436e JS |
1142 | err = -EINVAL; |
1143 | break; | |
ccb1352e JG |
1144 | } |
1145 | ||
1146 | return err; | |
1147 | } | |
1148 | ||
971427f3 AZ |
1149 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
1150 | struct sw_flow_key *key, | |
bef7f756 | 1151 | const struct nlattr *a, bool last) |
971427f3 | 1152 | { |
bef7f756 | 1153 | u32 recirc_id; |
971427f3 | 1154 | |
fff06c36 PS |
1155 | if (!is_flow_key_valid(key)) { |
1156 | int err; | |
1157 | ||
1158 | err = ovs_flow_key_update(skb, key); | |
1159 | if (err) | |
1160 | return err; | |
1161 | } | |
1162 | BUG_ON(!is_flow_key_valid(key)); | |
971427f3 | 1163 | |
bef7f756 | 1164 | recirc_id = nla_get_u32(a); |
1165 | return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true); | |
971427f3 AZ |
1166 | } |
1167 | ||
4d5ec89f NS |
1168 | static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb, |
1169 | struct sw_flow_key *key, | |
1170 | const struct nlattr *attr, bool last) | |
1171 | { | |
1172 | const struct nlattr *actions, *cpl_arg; | |
1173 | const struct check_pkt_len_arg *arg; | |
1174 | int rem = nla_len(attr); | |
1175 | bool clone_flow_key; | |
1176 | ||
1177 | /* The first netlink attribute in 'attr' is always | |
1178 | * 'OVS_CHECK_PKT_LEN_ATTR_ARG'. | |
1179 | */ | |
1180 | cpl_arg = nla_data(attr); | |
1181 | arg = nla_data(cpl_arg); | |
1182 | ||
1183 | if (skb->len <= arg->pkt_len) { | |
1184 | /* Second netlink attribute in 'attr' is always | |
1185 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'. | |
1186 | */ | |
1187 | actions = nla_next(cpl_arg, &rem); | |
1188 | clone_flow_key = !arg->exec_for_lesser_equal; | |
1189 | } else { | |
1190 | /* Third netlink attribute in 'attr' is always | |
1191 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'. | |
1192 | */ | |
1193 | actions = nla_next(cpl_arg, &rem); | |
1194 | actions = nla_next(actions, &rem); | |
1195 | clone_flow_key = !arg->exec_for_greater; | |
1196 | } | |
1197 | ||
1198 | return clone_execute(dp, skb, key, 0, nla_data(actions), | |
1199 | nla_len(actions), last, clone_flow_key); | |
1200 | } | |
1201 | ||
744676e7 MC |
1202 | static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key) |
1203 | { | |
1204 | int err; | |
1205 | ||
1206 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
1207 | struct ipv6hdr *nh; | |
1208 | ||
1209 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
1210 | sizeof(*nh)); | |
1211 | if (unlikely(err)) | |
1212 | return err; | |
1213 | ||
1214 | nh = ipv6_hdr(skb); | |
1215 | ||
1216 | if (nh->hop_limit <= 1) | |
1217 | return -EHOSTUNREACH; | |
1218 | ||
1219 | key->ip.ttl = --nh->hop_limit; | |
1220 | } else { | |
1221 | struct iphdr *nh; | |
1222 | u8 old_ttl; | |
1223 | ||
1224 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
1225 | sizeof(*nh)); | |
1226 | if (unlikely(err)) | |
1227 | return err; | |
1228 | ||
1229 | nh = ip_hdr(skb); | |
1230 | if (nh->ttl <= 1) | |
1231 | return -EHOSTUNREACH; | |
1232 | ||
1233 | old_ttl = nh->ttl--; | |
1234 | csum_replace2(&nh->check, htons(old_ttl << 8), | |
1235 | htons(nh->ttl << 8)); | |
1236 | key->ip.ttl = nh->ttl; | |
1237 | } | |
1238 | return 0; | |
1239 | } | |
1240 | ||
ccb1352e JG |
1241 | /* Execute a list of actions against 'skb'. */ |
1242 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 1243 | struct sw_flow_key *key, |
651887b0 | 1244 | const struct nlattr *attr, int len) |
ccb1352e | 1245 | { |
ccb1352e JG |
1246 | const struct nlattr *a; |
1247 | int rem; | |
1248 | ||
1249 | for (a = attr, rem = len; rem > 0; | |
1250 | a = nla_next(a, &rem)) { | |
1251 | int err = 0; | |
1252 | ||
5b8784aa | 1253 | switch (nla_type(a)) { |
1254 | case OVS_ACTION_ATTR_OUTPUT: { | |
1255 | int port = nla_get_u32(a); | |
1256 | struct sk_buff *clone; | |
1257 | ||
1258 | /* Every output action needs a separate clone | |
1259 | * of 'skb', In case the output action is the | |
1260 | * last action, cloning can be avoided. | |
1261 | */ | |
1262 | if (nla_is_last(a, rem)) { | |
1263 | do_output(dp, skb, port, key); | |
1264 | /* 'skb' has been used for output. | |
1265 | */ | |
1266 | return 0; | |
1267 | } | |
738967b8 | 1268 | |
5b8784aa | 1269 | clone = skb_clone(skb, GFP_ATOMIC); |
1270 | if (clone) | |
1271 | do_output(dp, clone, port, key); | |
f2a4d086 | 1272 | OVS_CB(skb)->cutlen = 0; |
ccb1352e | 1273 | break; |
5b8784aa | 1274 | } |
ccb1352e | 1275 | |
f2a4d086 WT |
1276 | case OVS_ACTION_ATTR_TRUNC: { |
1277 | struct ovs_action_trunc *trunc = nla_data(a); | |
1278 | ||
1279 | if (skb->len > trunc->max_len) | |
1280 | OVS_CB(skb)->cutlen = skb->len - trunc->max_len; | |
1281 | break; | |
1282 | } | |
1283 | ||
ccb1352e | 1284 | case OVS_ACTION_ATTR_USERSPACE: |
f2a4d086 WT |
1285 | output_userspace(dp, skb, key, a, attr, |
1286 | len, OVS_CB(skb)->cutlen); | |
1287 | OVS_CB(skb)->cutlen = 0; | |
ccb1352e JG |
1288 | break; |
1289 | ||
971427f3 AZ |
1290 | case OVS_ACTION_ATTR_HASH: |
1291 | execute_hash(skb, key, a); | |
1292 | break; | |
1293 | ||
f66b53fd MV |
1294 | case OVS_ACTION_ATTR_PUSH_MPLS: { |
1295 | struct ovs_action_push_mpls *mpls = nla_data(a); | |
1296 | ||
1297 | err = push_mpls(skb, key, mpls->mpls_lse, | |
1298 | mpls->mpls_ethertype, skb->mac_len); | |
25cd9ba0 | 1299 | break; |
f66b53fd MV |
1300 | } |
1301 | case OVS_ACTION_ATTR_ADD_MPLS: { | |
1302 | struct ovs_action_add_mpls *mpls = nla_data(a); | |
1303 | __u16 mac_len = 0; | |
1304 | ||
1305 | if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) | |
1306 | mac_len = skb->mac_len; | |
25cd9ba0 | 1307 | |
f66b53fd MV |
1308 | err = push_mpls(skb, key, mpls->mpls_lse, |
1309 | mpls->mpls_ethertype, mac_len); | |
1310 | break; | |
1311 | } | |
25cd9ba0 | 1312 | case OVS_ACTION_ATTR_POP_MPLS: |
fff06c36 | 1313 | err = pop_mpls(skb, key, nla_get_be16(a)); |
25cd9ba0 SH |
1314 | break; |
1315 | ||
ccb1352e | 1316 | case OVS_ACTION_ATTR_PUSH_VLAN: |
fff06c36 | 1317 | err = push_vlan(skb, key, nla_data(a)); |
ccb1352e JG |
1318 | break; |
1319 | ||
1320 | case OVS_ACTION_ATTR_POP_VLAN: | |
fff06c36 | 1321 | err = pop_vlan(skb, key); |
ccb1352e JG |
1322 | break; |
1323 | ||
bef7f756 | 1324 | case OVS_ACTION_ATTR_RECIRC: { |
1325 | bool last = nla_is_last(a, rem); | |
1326 | ||
1327 | err = execute_recirc(dp, skb, key, a, last); | |
1328 | if (last) { | |
971427f3 AZ |
1329 | /* If this is the last action, the skb has |
1330 | * been consumed or freed. | |
1331 | * Return immediately. | |
1332 | */ | |
1333 | return err; | |
1334 | } | |
1335 | break; | |
bef7f756 | 1336 | } |
971427f3 | 1337 | |
ccb1352e | 1338 | case OVS_ACTION_ATTR_SET: |
fff06c36 | 1339 | err = execute_set_action(skb, key, nla_data(a)); |
ccb1352e JG |
1340 | break; |
1341 | ||
83d2b9ba JR |
1342 | case OVS_ACTION_ATTR_SET_MASKED: |
1343 | case OVS_ACTION_ATTR_SET_TO_MASKED: | |
1344 | err = execute_masked_set_action(skb, key, nla_data(a)); | |
1345 | break; | |
1346 | ||
798c1661 | 1347 | case OVS_ACTION_ATTR_SAMPLE: { |
1348 | bool last = nla_is_last(a, rem); | |
1349 | ||
1350 | err = sample(dp, skb, key, a, last); | |
1351 | if (last) | |
1352 | return err; | |
1353 | ||
ccb1352e | 1354 | break; |
798c1661 | 1355 | } |
7f8a436e JS |
1356 | |
1357 | case OVS_ACTION_ATTR_CT: | |
ec0d043d JS |
1358 | if (!is_flow_key_valid(key)) { |
1359 | err = ovs_flow_key_update(skb, key); | |
1360 | if (err) | |
1361 | return err; | |
1362 | } | |
1363 | ||
7f8a436e JS |
1364 | err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key, |
1365 | nla_data(a)); | |
1366 | ||
1367 | /* Hide stolen IP fragments from user space. */ | |
74c16618 JS |
1368 | if (err) |
1369 | return err == -EINPROGRESS ? 0 : err; | |
7f8a436e | 1370 | break; |
91820da6 | 1371 | |
b8226962 EG |
1372 | case OVS_ACTION_ATTR_CT_CLEAR: |
1373 | err = ovs_ct_clear(skb, key); | |
1374 | break; | |
1375 | ||
91820da6 JB |
1376 | case OVS_ACTION_ATTR_PUSH_ETH: |
1377 | err = push_eth(skb, key, nla_data(a)); | |
1378 | break; | |
1379 | ||
1380 | case OVS_ACTION_ATTR_POP_ETH: | |
1381 | err = pop_eth(skb, key); | |
1382 | break; | |
b2d0f5d5 YY |
1383 | |
1384 | case OVS_ACTION_ATTR_PUSH_NSH: { | |
1385 | u8 buffer[NSH_HDR_MAX_LEN]; | |
1386 | struct nshhdr *nh = (struct nshhdr *)buffer; | |
1387 | ||
1388 | err = nsh_hdr_from_nlattr(nla_data(a), nh, | |
1389 | NSH_HDR_MAX_LEN); | |
1390 | if (unlikely(err)) | |
1391 | break; | |
1392 | err = push_nsh(skb, key, nh); | |
1393 | break; | |
1394 | } | |
1395 | ||
1396 | case OVS_ACTION_ATTR_POP_NSH: | |
1397 | err = pop_nsh(skb, key); | |
1398 | break; | |
cd8a6c33 AZ |
1399 | |
1400 | case OVS_ACTION_ATTR_METER: | |
1401 | if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) { | |
1402 | consume_skb(skb); | |
1403 | return 0; | |
1404 | } | |
b2335040 YS |
1405 | break; |
1406 | ||
1407 | case OVS_ACTION_ATTR_CLONE: { | |
1408 | bool last = nla_is_last(a, rem); | |
1409 | ||
1410 | err = clone(dp, skb, key, a, last); | |
1411 | if (last) | |
1412 | return err; | |
1413 | ||
1414 | break; | |
1415 | } | |
4d5ec89f NS |
1416 | |
1417 | case OVS_ACTION_ATTR_CHECK_PKT_LEN: { | |
1418 | bool last = nla_is_last(a, rem); | |
1419 | ||
1420 | err = execute_check_pkt_len(dp, skb, key, a, last); | |
1421 | if (last) | |
1422 | return err; | |
1423 | ||
1424 | break; | |
1425 | } | |
744676e7 MC |
1426 | |
1427 | case OVS_ACTION_ATTR_DEC_TTL: | |
1428 | err = execute_dec_ttl(skb, key); | |
1429 | if (err == -EHOSTUNREACH) { | |
1430 | err = dec_ttl_exception_handler(dp, skb, key, | |
1431 | a, true); | |
1432 | return err; | |
1433 | } | |
1434 | break; | |
ccb1352e JG |
1435 | } |
1436 | ||
1437 | if (unlikely(err)) { | |
1438 | kfree_skb(skb); | |
1439 | return err; | |
1440 | } | |
1441 | } | |
1442 | ||
5b8784aa | 1443 | consume_skb(skb); |
ccb1352e JG |
1444 | return 0; |
1445 | } | |
1446 | ||
bef7f756 | 1447 | /* Execute the actions on the clone of the packet. The effect of the |
1448 | * execution does not affect the original 'skb' nor the original 'key'. | |
1449 | * | |
1450 | * The execution may be deferred in case the actions can not be executed | |
1451 | * immediately. | |
1452 | */ | |
1453 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, | |
1454 | struct sw_flow_key *key, u32 recirc_id, | |
1455 | const struct nlattr *actions, int len, | |
1456 | bool last, bool clone_flow_key) | |
1457 | { | |
1458 | struct deferred_action *da; | |
1459 | struct sw_flow_key *clone; | |
1460 | ||
1461 | skb = last ? skb : skb_clone(skb, GFP_ATOMIC); | |
1462 | if (!skb) { | |
1463 | /* Out of memory, skip this action. | |
1464 | */ | |
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | /* When clone_flow_key is false, the 'key' will not be change | |
1469 | * by the actions, then the 'key' can be used directly. | |
1470 | * Otherwise, try to clone key from the next recursion level of | |
1471 | * 'flow_keys'. If clone is successful, execute the actions | |
1472 | * without deferring. | |
1473 | */ | |
1474 | clone = clone_flow_key ? clone_key(key) : key; | |
1475 | if (clone) { | |
1476 | int err = 0; | |
1477 | ||
1478 | if (actions) { /* Sample action */ | |
1479 | if (clone_flow_key) | |
1480 | __this_cpu_inc(exec_actions_level); | |
1481 | ||
1482 | err = do_execute_actions(dp, skb, clone, | |
1483 | actions, len); | |
1484 | ||
1485 | if (clone_flow_key) | |
1486 | __this_cpu_dec(exec_actions_level); | |
1487 | } else { /* Recirc action */ | |
1488 | clone->recirc_id = recirc_id; | |
1489 | ovs_dp_process_packet(skb, clone); | |
1490 | } | |
1491 | return err; | |
1492 | } | |
1493 | ||
1494 | /* Out of 'flow_keys' space. Defer actions */ | |
1495 | da = add_deferred_actions(skb, key, actions, len); | |
1496 | if (da) { | |
1497 | if (!actions) { /* Recirc action */ | |
1498 | key = &da->pkt_key; | |
1499 | key->recirc_id = recirc_id; | |
1500 | } | |
1501 | } else { | |
1502 | /* Out of per CPU action FIFO space. Drop the 'skb' and | |
1503 | * log an error. | |
1504 | */ | |
1505 | kfree_skb(skb); | |
1506 | ||
1507 | if (net_ratelimit()) { | |
1508 | if (actions) { /* Sample action */ | |
1509 | pr_warn("%s: deferred action limit reached, drop sample action\n", | |
1510 | ovs_dp_name(dp)); | |
1511 | } else { /* Recirc action */ | |
1512 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
1513 | ovs_dp_name(dp)); | |
1514 | } | |
1515 | } | |
1516 | } | |
1517 | return 0; | |
1518 | } | |
1519 | ||
971427f3 AZ |
1520 | static void process_deferred_actions(struct datapath *dp) |
1521 | { | |
1522 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
1523 | ||
1524 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
1525 | if (action_fifo_is_empty(fifo)) | |
1526 | return; | |
1527 | ||
1528 | /* Finishing executing all deferred actions. */ | |
1529 | do { | |
1530 | struct deferred_action *da = action_fifo_get(fifo); | |
1531 | struct sk_buff *skb = da->skb; | |
1532 | struct sw_flow_key *key = &da->pkt_key; | |
1533 | const struct nlattr *actions = da->actions; | |
47c697aa | 1534 | int actions_len = da->actions_len; |
971427f3 AZ |
1535 | |
1536 | if (actions) | |
47c697aa | 1537 | do_execute_actions(dp, skb, key, actions, actions_len); |
971427f3 AZ |
1538 | else |
1539 | ovs_dp_process_packet(skb, key); | |
1540 | } while (!action_fifo_is_empty(fifo)); | |
1541 | ||
1542 | /* Reset FIFO for the next packet. */ | |
1543 | action_fifo_init(fifo); | |
1544 | } | |
1545 | ||
ccb1352e | 1546 | /* Execute a list of actions against 'skb'. */ |
2ff3e4e4 | 1547 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
12eb18f7 TG |
1548 | const struct sw_flow_actions *acts, |
1549 | struct sw_flow_key *key) | |
ccb1352e | 1550 | { |
b064d0d8 HFS |
1551 | int err, level; |
1552 | ||
1553 | level = __this_cpu_inc_return(exec_actions_level); | |
2679d040 | 1554 | if (unlikely(level > OVS_RECURSION_LIMIT)) { |
b064d0d8 HFS |
1555 | net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n", |
1556 | ovs_dp_name(dp)); | |
1557 | kfree_skb(skb); | |
1558 | err = -ENETDOWN; | |
1559 | goto out; | |
1560 | } | |
971427f3 | 1561 | |
494bea39 | 1562 | OVS_CB(skb)->acts_origlen = acts->orig_len; |
971427f3 AZ |
1563 | err = do_execute_actions(dp, skb, key, |
1564 | acts->actions, acts->actions_len); | |
1565 | ||
b064d0d8 | 1566 | if (level == 1) |
971427f3 AZ |
1567 | process_deferred_actions(dp); |
1568 | ||
b064d0d8 HFS |
1569 | out: |
1570 | __this_cpu_dec(exec_actions_level); | |
971427f3 AZ |
1571 | return err; |
1572 | } | |
1573 | ||
1574 | int action_fifos_init(void) | |
1575 | { | |
1576 | action_fifos = alloc_percpu(struct action_fifo); | |
1577 | if (!action_fifos) | |
1578 | return -ENOMEM; | |
ccb1352e | 1579 | |
4572ef52 | 1580 | flow_keys = alloc_percpu(struct action_flow_keys); |
1581 | if (!flow_keys) { | |
2679d040 LR |
1582 | free_percpu(action_fifos); |
1583 | return -ENOMEM; | |
1584 | } | |
1585 | ||
971427f3 AZ |
1586 | return 0; |
1587 | } | |
1588 | ||
1589 | void action_fifos_exit(void) | |
1590 | { | |
1591 | free_percpu(action_fifos); | |
4572ef52 | 1592 | free_percpu(flow_keys); |
ccb1352e | 1593 | } |