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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> | |
a175a723 | 12 | #include <linux/sctp.h> |
ccb1352e JG |
13 | #include <linux/tcp.h> |
14 | #include <linux/udp.h> | |
15 | #include <linux/in6.h> | |
16 | #include <linux/if_arp.h> | |
17 | #include <linux/if_vlan.h> | |
25cd9ba0 | 18 | |
7f8a436e | 19 | #include <net/dst.h> |
ccb1352e | 20 | #include <net/ip.h> |
3fdbd1ce | 21 | #include <net/ipv6.h> |
7b85b4df | 22 | #include <net/ip6_fib.h> |
ccb1352e JG |
23 | #include <net/checksum.h> |
24 | #include <net/dsfield.h> | |
25cd9ba0 | 25 | #include <net/mpls.h> |
a175a723 | 26 | #include <net/sctp/checksum.h> |
ccb1352e JG |
27 | |
28 | #include "datapath.h" | |
971427f3 | 29 | #include "flow.h" |
7f8a436e | 30 | #include "conntrack.h" |
ccb1352e | 31 | #include "vport.h" |
b2d0f5d5 | 32 | #include "flow_netlink.h" |
ccb1352e | 33 | |
971427f3 AZ |
34 | struct deferred_action { |
35 | struct sk_buff *skb; | |
36 | const struct nlattr *actions; | |
47c697aa | 37 | int actions_len; |
971427f3 AZ |
38 | |
39 | /* Store pkt_key clone when creating deferred action. */ | |
40 | struct sw_flow_key pkt_key; | |
41 | }; | |
42 | ||
7f8a436e JS |
43 | #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN) |
44 | struct ovs_frag_data { | |
45 | unsigned long dst; | |
46 | struct vport *vport; | |
47 | struct ovs_skb_cb cb; | |
48 | __be16 inner_protocol; | |
c66549ff JB |
49 | u16 network_offset; /* valid only for MPLS */ |
50 | u16 vlan_tci; | |
7f8a436e JS |
51 | __be16 vlan_proto; |
52 | unsigned int l2_len; | |
e2d9d835 | 53 | u8 mac_proto; |
7f8a436e JS |
54 | u8 l2_data[MAX_L2_LEN]; |
55 | }; | |
56 | ||
57 | static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage); | |
58 | ||
971427f3 | 59 | #define DEFERRED_ACTION_FIFO_SIZE 10 |
2679d040 LR |
60 | #define OVS_RECURSION_LIMIT 5 |
61 | #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2) | |
971427f3 AZ |
62 | struct action_fifo { |
63 | int head; | |
64 | int tail; | |
65 | /* Deferred action fifo queue storage. */ | |
66 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; | |
67 | }; | |
68 | ||
4572ef52 | 69 | struct action_flow_keys { |
2679d040 LR |
70 | struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD]; |
71 | }; | |
72 | ||
971427f3 | 73 | static struct action_fifo __percpu *action_fifos; |
4572ef52 | 74 | static struct action_flow_keys __percpu *flow_keys; |
971427f3 AZ |
75 | static DEFINE_PER_CPU(int, exec_actions_level); |
76 | ||
4572ef52 | 77 | /* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys' |
78 | * space. Return NULL if out of key spaces. | |
79 | */ | |
80 | static struct sw_flow_key *clone_key(const struct sw_flow_key *key_) | |
81 | { | |
82 | struct action_flow_keys *keys = this_cpu_ptr(flow_keys); | |
83 | int level = this_cpu_read(exec_actions_level); | |
84 | struct sw_flow_key *key = NULL; | |
85 | ||
86 | if (level <= OVS_DEFERRED_ACTION_THRESHOLD) { | |
87 | key = &keys->key[level - 1]; | |
88 | *key = *key_; | |
89 | } | |
90 | ||
91 | return key; | |
92 | } | |
93 | ||
971427f3 AZ |
94 | static void action_fifo_init(struct action_fifo *fifo) |
95 | { | |
96 | fifo->head = 0; | |
97 | fifo->tail = 0; | |
98 | } | |
99 | ||
12eb18f7 | 100 | static bool action_fifo_is_empty(const struct action_fifo *fifo) |
971427f3 AZ |
101 | { |
102 | return (fifo->head == fifo->tail); | |
103 | } | |
104 | ||
105 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) | |
106 | { | |
107 | if (action_fifo_is_empty(fifo)) | |
108 | return NULL; | |
109 | ||
110 | return &fifo->fifo[fifo->tail++]; | |
111 | } | |
112 | ||
113 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) | |
114 | { | |
115 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) | |
116 | return NULL; | |
117 | ||
118 | return &fifo->fifo[fifo->head++]; | |
119 | } | |
120 | ||
121 | /* Return true if fifo is not full */ | |
122 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, | |
47c697aa | 123 | const struct sw_flow_key *key, |
124 | const struct nlattr *actions, | |
125 | const int actions_len) | |
971427f3 AZ |
126 | { |
127 | struct action_fifo *fifo; | |
128 | struct deferred_action *da; | |
129 | ||
130 | fifo = this_cpu_ptr(action_fifos); | |
131 | da = action_fifo_put(fifo); | |
132 | if (da) { | |
133 | da->skb = skb; | |
47c697aa | 134 | da->actions = actions; |
135 | da->actions_len = actions_len; | |
971427f3 AZ |
136 | da->pkt_key = *key; |
137 | } | |
138 | ||
139 | return da; | |
140 | } | |
141 | ||
fff06c36 PS |
142 | static void invalidate_flow_key(struct sw_flow_key *key) |
143 | { | |
329f45bc | 144 | key->mac_proto |= SW_FLOW_KEY_INVALID; |
fff06c36 PS |
145 | } |
146 | ||
147 | static bool is_flow_key_valid(const struct sw_flow_key *key) | |
148 | { | |
329f45bc | 149 | return !(key->mac_proto & SW_FLOW_KEY_INVALID); |
fff06c36 PS |
150 | } |
151 | ||
bef7f756 | 152 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, |
153 | struct sw_flow_key *key, | |
154 | u32 recirc_id, | |
155 | const struct nlattr *actions, int len, | |
156 | bool last, bool clone_flow_key); | |
157 | ||
4d5ec89f NS |
158 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
159 | struct sw_flow_key *key, | |
160 | const struct nlattr *attr, int len); | |
161 | ||
fff06c36 | 162 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
f66b53fd | 163 | __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len) |
25cd9ba0 | 164 | { |
8822e270 | 165 | int err; |
25cd9ba0 | 166 | |
f66b53fd | 167 | err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len); |
8822e270 JH |
168 | if (err) |
169 | return err; | |
25cd9ba0 | 170 | |
f66b53fd MV |
171 | if (!mac_len) |
172 | key->mac_proto = MAC_PROTO_NONE; | |
173 | ||
fff06c36 | 174 | invalidate_flow_key(key); |
25cd9ba0 SH |
175 | return 0; |
176 | } | |
177 | ||
fff06c36 PS |
178 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
179 | const __be16 ethertype) | |
25cd9ba0 | 180 | { |
25cd9ba0 SH |
181 | int err; |
182 | ||
040b5cfb MV |
183 | err = skb_mpls_pop(skb, ethertype, skb->mac_len, |
184 | ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET); | |
ed246cee | 185 | if (err) |
25cd9ba0 SH |
186 | return err; |
187 | ||
f66b53fd MV |
188 | if (ethertype == htons(ETH_P_TEB)) |
189 | key->mac_proto = MAC_PROTO_ETHERNET; | |
190 | ||
fff06c36 | 191 | invalidate_flow_key(key); |
25cd9ba0 SH |
192 | return 0; |
193 | } | |
194 | ||
83d2b9ba JR |
195 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key, |
196 | const __be32 *mpls_lse, const __be32 *mask) | |
25cd9ba0 | 197 | { |
85de4a21 | 198 | struct mpls_shim_hdr *stack; |
83d2b9ba | 199 | __be32 lse; |
25cd9ba0 SH |
200 | int err; |
201 | ||
43c13605 DC |
202 | if (!pskb_may_pull(skb, skb_network_offset(skb) + MPLS_HLEN)) |
203 | return -ENOMEM; | |
204 | ||
85de4a21 JB |
205 | stack = mpls_hdr(skb); |
206 | lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask); | |
d27cf5c5 JH |
207 | err = skb_mpls_update_lse(skb, lse); |
208 | if (err) | |
209 | return err; | |
25cd9ba0 | 210 | |
fbdcdd78 | 211 | flow_key->mpls.lse[0] = lse; |
25cd9ba0 SH |
212 | return 0; |
213 | } | |
214 | ||
fff06c36 | 215 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e | 216 | { |
ccb1352e JG |
217 | int err; |
218 | ||
93515d53 | 219 | err = skb_vlan_pop(skb); |
018c1dda | 220 | if (skb_vlan_tag_present(skb)) { |
93515d53 | 221 | invalidate_flow_key(key); |
018c1dda EG |
222 | } else { |
223 | key->eth.vlan.tci = 0; | |
224 | key->eth.vlan.tpid = 0; | |
225 | } | |
93515d53 | 226 | return err; |
ccb1352e JG |
227 | } |
228 | ||
fff06c36 PS |
229 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
230 | const struct ovs_action_push_vlan *vlan) | |
ccb1352e | 231 | { |
018c1dda | 232 | if (skb_vlan_tag_present(skb)) { |
fff06c36 | 233 | invalidate_flow_key(key); |
018c1dda EG |
234 | } else { |
235 | key->eth.vlan.tci = vlan->vlan_tci; | |
236 | key->eth.vlan.tpid = vlan->vlan_tpid; | |
237 | } | |
93515d53 | 238 | return skb_vlan_push(skb, vlan->vlan_tpid, |
9df46aef | 239 | ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK); |
ccb1352e JG |
240 | } |
241 | ||
83d2b9ba JR |
242 | /* 'src' is already properly masked. */ |
243 | static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_) | |
244 | { | |
245 | u16 *dst = (u16 *)dst_; | |
246 | const u16 *src = (const u16 *)src_; | |
247 | const u16 *mask = (const u16 *)mask_; | |
248 | ||
be26b9a8 JS |
249 | OVS_SET_MASKED(dst[0], src[0], mask[0]); |
250 | OVS_SET_MASKED(dst[1], src[1], mask[1]); | |
251 | OVS_SET_MASKED(dst[2], src[2], mask[2]); | |
83d2b9ba JR |
252 | } |
253 | ||
254 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
255 | const struct ovs_key_ethernet *key, | |
256 | const struct ovs_key_ethernet *mask) | |
ccb1352e JG |
257 | { |
258 | int err; | |
83d2b9ba | 259 | |
e2195121 | 260 | err = skb_ensure_writable(skb, ETH_HLEN); |
ccb1352e JG |
261 | if (unlikely(err)) |
262 | return err; | |
263 | ||
b34df5e8 PS |
264 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
265 | ||
83d2b9ba JR |
266 | ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src, |
267 | mask->eth_src); | |
268 | ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst, | |
269 | mask->eth_dst); | |
ccb1352e | 270 | |
6b83d28a | 271 | skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
b34df5e8 | 272 | |
83d2b9ba JR |
273 | ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source); |
274 | ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest); | |
ccb1352e JG |
275 | return 0; |
276 | } | |
277 | ||
91820da6 JB |
278 | /* pop_eth does not support VLAN packets as this action is never called |
279 | * for them. | |
280 | */ | |
281 | static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key) | |
282 | { | |
19fbcb36 GN |
283 | int err; |
284 | ||
285 | err = skb_eth_pop(skb); | |
286 | if (err) | |
287 | return err; | |
91820da6 JB |
288 | |
289 | /* safe right before invalidate_flow_key */ | |
290 | key->mac_proto = MAC_PROTO_NONE; | |
291 | invalidate_flow_key(key); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static int push_eth(struct sk_buff *skb, struct sw_flow_key *key, | |
296 | const struct ovs_action_push_eth *ethh) | |
297 | { | |
19fbcb36 | 298 | int err; |
91820da6 | 299 | |
19fbcb36 GN |
300 | err = skb_eth_push(skb, ethh->addresses.eth_dst, |
301 | ethh->addresses.eth_src); | |
302 | if (err) | |
303 | return err; | |
91820da6 JB |
304 | |
305 | /* safe right before invalidate_flow_key */ | |
306 | key->mac_proto = MAC_PROTO_ETHERNET; | |
307 | invalidate_flow_key(key); | |
308 | return 0; | |
309 | } | |
310 | ||
b2d0f5d5 YY |
311 | static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key, |
312 | const struct nshhdr *nh) | |
313 | { | |
314 | int err; | |
315 | ||
316 | err = nsh_push(skb, nh); | |
317 | if (err) | |
318 | return err; | |
319 | ||
320 | /* safe right before invalidate_flow_key */ | |
321 | key->mac_proto = MAC_PROTO_NONE; | |
322 | invalidate_flow_key(key); | |
323 | return 0; | |
324 | } | |
325 | ||
326 | static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key) | |
327 | { | |
328 | int err; | |
329 | ||
330 | err = nsh_pop(skb); | |
331 | if (err) | |
332 | return err; | |
333 | ||
334 | /* safe right before invalidate_flow_key */ | |
335 | if (skb->protocol == htons(ETH_P_TEB)) | |
336 | key->mac_proto = MAC_PROTO_ETHERNET; | |
337 | else | |
338 | key->mac_proto = MAC_PROTO_NONE; | |
339 | invalidate_flow_key(key); | |
340 | return 0; | |
341 | } | |
342 | ||
3576fd79 GG |
343 | static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh, |
344 | __be32 addr, __be32 new_addr) | |
ccb1352e JG |
345 | { |
346 | int transport_len = skb->len - skb_transport_offset(skb); | |
347 | ||
3576fd79 GG |
348 | if (nh->frag_off & htons(IP_OFFSET)) |
349 | return; | |
350 | ||
ccb1352e JG |
351 | if (nh->protocol == IPPROTO_TCP) { |
352 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
353 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, | |
4b048d6d | 354 | addr, new_addr, true); |
ccb1352e | 355 | } else if (nh->protocol == IPPROTO_UDP) { |
81e5d41d JG |
356 | if (likely(transport_len >= sizeof(struct udphdr))) { |
357 | struct udphdr *uh = udp_hdr(skb); | |
358 | ||
359 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
360 | inet_proto_csum_replace4(&uh->check, skb, | |
4b048d6d | 361 | addr, new_addr, true); |
81e5d41d JG |
362 | if (!uh->check) |
363 | uh->check = CSUM_MANGLED_0; | |
364 | } | |
365 | } | |
ccb1352e | 366 | } |
3576fd79 | 367 | } |
ccb1352e | 368 | |
3576fd79 GG |
369 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
370 | __be32 *addr, __be32 new_addr) | |
371 | { | |
372 | update_ip_l4_checksum(skb, nh, *addr, new_addr); | |
ccb1352e | 373 | csum_replace4(&nh->check, *addr, new_addr); |
7539fadc | 374 | skb_clear_hash(skb); |
ccb1352e JG |
375 | *addr = new_addr; |
376 | } | |
377 | ||
3fdbd1ce AA |
378 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
379 | __be32 addr[4], const __be32 new_addr[4]) | |
380 | { | |
381 | int transport_len = skb->len - skb_transport_offset(skb); | |
382 | ||
856447d0 | 383 | if (l4_proto == NEXTHDR_TCP) { |
3fdbd1ce AA |
384 | if (likely(transport_len >= sizeof(struct tcphdr))) |
385 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
4b048d6d | 386 | addr, new_addr, true); |
856447d0 | 387 | } else if (l4_proto == NEXTHDR_UDP) { |
3fdbd1ce AA |
388 | if (likely(transport_len >= sizeof(struct udphdr))) { |
389 | struct udphdr *uh = udp_hdr(skb); | |
390 | ||
391 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
392 | inet_proto_csum_replace16(&uh->check, skb, | |
4b048d6d | 393 | addr, new_addr, true); |
3fdbd1ce AA |
394 | if (!uh->check) |
395 | uh->check = CSUM_MANGLED_0; | |
396 | } | |
397 | } | |
856447d0 JG |
398 | } else if (l4_proto == NEXTHDR_ICMP) { |
399 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
400 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
4b048d6d | 401 | skb, addr, new_addr, true); |
3fdbd1ce AA |
402 | } |
403 | } | |
404 | ||
83d2b9ba JR |
405 | static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4], |
406 | const __be32 mask[4], __be32 masked[4]) | |
407 | { | |
be26b9a8 JS |
408 | masked[0] = OVS_MASKED(old[0], addr[0], mask[0]); |
409 | masked[1] = OVS_MASKED(old[1], addr[1], mask[1]); | |
410 | masked[2] = OVS_MASKED(old[2], addr[2], mask[2]); | |
411 | masked[3] = OVS_MASKED(old[3], addr[3], mask[3]); | |
83d2b9ba JR |
412 | } |
413 | ||
3fdbd1ce AA |
414 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, |
415 | __be32 addr[4], const __be32 new_addr[4], | |
416 | bool recalculate_csum) | |
417 | { | |
418 | if (recalculate_csum) | |
419 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); | |
420 | ||
7539fadc | 421 | skb_clear_hash(skb); |
3fdbd1ce AA |
422 | memcpy(addr, new_addr, sizeof(__be32[4])); |
423 | } | |
424 | ||
83d2b9ba | 425 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask) |
3fdbd1ce | 426 | { |
83d2b9ba | 427 | /* Bits 21-24 are always unmasked, so this retains their values. */ |
be26b9a8 JS |
428 | OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16)); |
429 | OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8)); | |
430 | OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask); | |
3fdbd1ce AA |
431 | } |
432 | ||
83d2b9ba JR |
433 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl, |
434 | u8 mask) | |
3fdbd1ce | 435 | { |
be26b9a8 | 436 | new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask); |
3fdbd1ce | 437 | |
ccb1352e JG |
438 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); |
439 | nh->ttl = new_ttl; | |
440 | } | |
441 | ||
83d2b9ba JR |
442 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key, |
443 | const struct ovs_key_ipv4 *key, | |
444 | const struct ovs_key_ipv4 *mask) | |
ccb1352e JG |
445 | { |
446 | struct iphdr *nh; | |
83d2b9ba | 447 | __be32 new_addr; |
ccb1352e JG |
448 | int err; |
449 | ||
e2195121 JP |
450 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
451 | sizeof(struct iphdr)); | |
ccb1352e JG |
452 | if (unlikely(err)) |
453 | return err; | |
454 | ||
455 | nh = ip_hdr(skb); | |
456 | ||
83d2b9ba JR |
457 | /* Setting an IP addresses is typically only a side effect of |
458 | * matching on them in the current userspace implementation, so it | |
459 | * makes sense to check if the value actually changed. | |
460 | */ | |
461 | if (mask->ipv4_src) { | |
be26b9a8 | 462 | new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src); |
ccb1352e | 463 | |
83d2b9ba JR |
464 | if (unlikely(new_addr != nh->saddr)) { |
465 | set_ip_addr(skb, nh, &nh->saddr, new_addr); | |
466 | flow_key->ipv4.addr.src = new_addr; | |
467 | } | |
fff06c36 | 468 | } |
83d2b9ba | 469 | if (mask->ipv4_dst) { |
be26b9a8 | 470 | new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst); |
ccb1352e | 471 | |
83d2b9ba JR |
472 | if (unlikely(new_addr != nh->daddr)) { |
473 | set_ip_addr(skb, nh, &nh->daddr, new_addr); | |
474 | flow_key->ipv4.addr.dst = new_addr; | |
475 | } | |
fff06c36 | 476 | } |
83d2b9ba JR |
477 | if (mask->ipv4_tos) { |
478 | ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos); | |
479 | flow_key->ip.tos = nh->tos; | |
480 | } | |
481 | if (mask->ipv4_ttl) { | |
482 | set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl); | |
483 | flow_key->ip.ttl = nh->ttl; | |
fff06c36 | 484 | } |
ccb1352e JG |
485 | |
486 | return 0; | |
487 | } | |
488 | ||
83d2b9ba JR |
489 | static bool is_ipv6_mask_nonzero(const __be32 addr[4]) |
490 | { | |
491 | return !!(addr[0] | addr[1] | addr[2] | addr[3]); | |
492 | } | |
493 | ||
494 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
495 | const struct ovs_key_ipv6 *key, | |
496 | const struct ovs_key_ipv6 *mask) | |
3fdbd1ce AA |
497 | { |
498 | struct ipv6hdr *nh; | |
499 | int err; | |
3fdbd1ce | 500 | |
e2195121 JP |
501 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
502 | sizeof(struct ipv6hdr)); | |
3fdbd1ce AA |
503 | if (unlikely(err)) |
504 | return err; | |
505 | ||
506 | nh = ipv6_hdr(skb); | |
3fdbd1ce | 507 | |
83d2b9ba JR |
508 | /* Setting an IP addresses is typically only a side effect of |
509 | * matching on them in the current userspace implementation, so it | |
510 | * makes sense to check if the value actually changed. | |
511 | */ | |
512 | if (is_ipv6_mask_nonzero(mask->ipv6_src)) { | |
513 | __be32 *saddr = (__be32 *)&nh->saddr; | |
514 | __be32 masked[4]; | |
515 | ||
516 | mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked); | |
517 | ||
518 | if (unlikely(memcmp(saddr, masked, sizeof(masked)))) { | |
b4f70527 | 519 | set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked, |
83d2b9ba JR |
520 | true); |
521 | memcpy(&flow_key->ipv6.addr.src, masked, | |
522 | sizeof(flow_key->ipv6.addr.src)); | |
523 | } | |
524 | } | |
525 | if (is_ipv6_mask_nonzero(mask->ipv6_dst)) { | |
3fdbd1ce AA |
526 | unsigned int offset = 0; |
527 | int flags = IP6_FH_F_SKIP_RH; | |
528 | bool recalc_csum = true; | |
83d2b9ba JR |
529 | __be32 *daddr = (__be32 *)&nh->daddr; |
530 | __be32 masked[4]; | |
531 | ||
532 | mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked); | |
533 | ||
534 | if (unlikely(memcmp(daddr, masked, sizeof(masked)))) { | |
535 | if (ipv6_ext_hdr(nh->nexthdr)) | |
536 | recalc_csum = (ipv6_find_hdr(skb, &offset, | |
537 | NEXTHDR_ROUTING, | |
538 | NULL, &flags) | |
539 | != NEXTHDR_ROUTING); | |
540 | ||
b4f70527 | 541 | set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked, |
83d2b9ba JR |
542 | recalc_csum); |
543 | memcpy(&flow_key->ipv6.addr.dst, masked, | |
544 | sizeof(flow_key->ipv6.addr.dst)); | |
545 | } | |
546 | } | |
547 | if (mask->ipv6_tclass) { | |
548 | ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass); | |
549 | flow_key->ip.tos = ipv6_get_dsfield(nh); | |
550 | } | |
551 | if (mask->ipv6_label) { | |
552 | set_ipv6_fl(nh, ntohl(key->ipv6_label), | |
553 | ntohl(mask->ipv6_label)); | |
554 | flow_key->ipv6.label = | |
555 | *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
556 | } | |
557 | if (mask->ipv6_hlimit) { | |
be26b9a8 JS |
558 | OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit, |
559 | mask->ipv6_hlimit); | |
83d2b9ba | 560 | flow_key->ip.ttl = nh->hop_limit; |
3fdbd1ce | 561 | } |
3fdbd1ce AA |
562 | return 0; |
563 | } | |
564 | ||
b2d0f5d5 YY |
565 | static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key, |
566 | const struct nlattr *a) | |
567 | { | |
568 | struct nshhdr *nh; | |
569 | size_t length; | |
570 | int err; | |
571 | u8 flags; | |
572 | u8 ttl; | |
573 | int i; | |
574 | ||
575 | struct ovs_key_nsh key; | |
576 | struct ovs_key_nsh mask; | |
577 | ||
578 | err = nsh_key_from_nlattr(a, &key, &mask); | |
579 | if (err) | |
580 | return err; | |
581 | ||
582 | /* Make sure the NSH base header is there */ | |
583 | if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN)) | |
584 | return -ENOMEM; | |
585 | ||
586 | nh = nsh_hdr(skb); | |
587 | length = nsh_hdr_len(nh); | |
588 | ||
589 | /* Make sure the whole NSH header is there */ | |
590 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
591 | length); | |
592 | if (unlikely(err)) | |
593 | return err; | |
594 | ||
595 | nh = nsh_hdr(skb); | |
596 | skb_postpull_rcsum(skb, nh, length); | |
597 | flags = nsh_get_flags(nh); | |
598 | flags = OVS_MASKED(flags, key.base.flags, mask.base.flags); | |
599 | flow_key->nsh.base.flags = flags; | |
600 | ttl = nsh_get_ttl(nh); | |
601 | ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl); | |
602 | flow_key->nsh.base.ttl = ttl; | |
603 | nsh_set_flags_and_ttl(nh, flags, ttl); | |
604 | nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr, | |
605 | mask.base.path_hdr); | |
606 | flow_key->nsh.base.path_hdr = nh->path_hdr; | |
607 | switch (nh->mdtype) { | |
608 | case NSH_M_TYPE1: | |
609 | for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) { | |
610 | nh->md1.context[i] = | |
611 | OVS_MASKED(nh->md1.context[i], key.context[i], | |
612 | mask.context[i]); | |
613 | } | |
614 | memcpy(flow_key->nsh.context, nh->md1.context, | |
615 | sizeof(nh->md1.context)); | |
616 | break; | |
617 | case NSH_M_TYPE2: | |
618 | memset(flow_key->nsh.context, 0, | |
619 | sizeof(flow_key->nsh.context)); | |
620 | break; | |
621 | default: | |
622 | return -EINVAL; | |
623 | } | |
624 | skb_postpush_rcsum(skb, nh, length); | |
625 | return 0; | |
626 | } | |
627 | ||
e2195121 | 628 | /* Must follow skb_ensure_writable() since that can move the skb data. */ |
ccb1352e | 629 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
83d2b9ba | 630 | __be16 new_port, __sum16 *check) |
ccb1352e | 631 | { |
4b048d6d | 632 | inet_proto_csum_replace2(check, skb, *port, new_port, false); |
ccb1352e | 633 | *port = new_port; |
81e5d41d JG |
634 | } |
635 | ||
83d2b9ba JR |
636 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
637 | const struct ovs_key_udp *key, | |
638 | const struct ovs_key_udp *mask) | |
ccb1352e JG |
639 | { |
640 | struct udphdr *uh; | |
83d2b9ba | 641 | __be16 src, dst; |
ccb1352e JG |
642 | int err; |
643 | ||
e2195121 JP |
644 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
645 | sizeof(struct udphdr)); | |
ccb1352e JG |
646 | if (unlikely(err)) |
647 | return err; | |
648 | ||
649 | uh = udp_hdr(skb); | |
83d2b9ba | 650 | /* Either of the masks is non-zero, so do not bother checking them. */ |
be26b9a8 JS |
651 | src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src); |
652 | dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst); | |
ccb1352e | 653 | |
83d2b9ba JR |
654 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
655 | if (likely(src != uh->source)) { | |
656 | set_tp_port(skb, &uh->source, src, &uh->check); | |
657 | flow_key->tp.src = src; | |
658 | } | |
659 | if (likely(dst != uh->dest)) { | |
660 | set_tp_port(skb, &uh->dest, dst, &uh->check); | |
661 | flow_key->tp.dst = dst; | |
662 | } | |
663 | ||
664 | if (unlikely(!uh->check)) | |
665 | uh->check = CSUM_MANGLED_0; | |
666 | } else { | |
667 | uh->source = src; | |
668 | uh->dest = dst; | |
669 | flow_key->tp.src = src; | |
670 | flow_key->tp.dst = dst; | |
fff06c36 | 671 | } |
ccb1352e | 672 | |
83d2b9ba JR |
673 | skb_clear_hash(skb); |
674 | ||
ccb1352e JG |
675 | return 0; |
676 | } | |
677 | ||
83d2b9ba JR |
678 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
679 | const struct ovs_key_tcp *key, | |
680 | const struct ovs_key_tcp *mask) | |
ccb1352e JG |
681 | { |
682 | struct tcphdr *th; | |
83d2b9ba | 683 | __be16 src, dst; |
ccb1352e JG |
684 | int err; |
685 | ||
e2195121 JP |
686 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
687 | sizeof(struct tcphdr)); | |
ccb1352e JG |
688 | if (unlikely(err)) |
689 | return err; | |
690 | ||
691 | th = tcp_hdr(skb); | |
be26b9a8 | 692 | src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src); |
83d2b9ba JR |
693 | if (likely(src != th->source)) { |
694 | set_tp_port(skb, &th->source, src, &th->check); | |
695 | flow_key->tp.src = src; | |
fff06c36 | 696 | } |
be26b9a8 | 697 | dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst); |
83d2b9ba JR |
698 | if (likely(dst != th->dest)) { |
699 | set_tp_port(skb, &th->dest, dst, &th->check); | |
700 | flow_key->tp.dst = dst; | |
fff06c36 | 701 | } |
83d2b9ba | 702 | skb_clear_hash(skb); |
ccb1352e JG |
703 | |
704 | return 0; | |
705 | } | |
706 | ||
83d2b9ba JR |
707 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
708 | const struct ovs_key_sctp *key, | |
709 | const struct ovs_key_sctp *mask) | |
a175a723 | 710 | { |
83d2b9ba | 711 | unsigned int sctphoff = skb_transport_offset(skb); |
a175a723 | 712 | struct sctphdr *sh; |
83d2b9ba | 713 | __le32 old_correct_csum, new_csum, old_csum; |
a175a723 | 714 | int err; |
a175a723 | 715 | |
e2195121 | 716 | err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr)); |
a175a723 JS |
717 | if (unlikely(err)) |
718 | return err; | |
719 | ||
720 | sh = sctp_hdr(skb); | |
83d2b9ba JR |
721 | old_csum = sh->checksum; |
722 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
a175a723 | 723 | |
be26b9a8 JS |
724 | sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src); |
725 | sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst); | |
a175a723 | 726 | |
83d2b9ba | 727 | new_csum = sctp_compute_cksum(skb, sctphoff); |
a175a723 | 728 | |
83d2b9ba JR |
729 | /* Carry any checksum errors through. */ |
730 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
a175a723 | 731 | |
83d2b9ba JR |
732 | skb_clear_hash(skb); |
733 | flow_key->tp.src = sh->source; | |
734 | flow_key->tp.dst = sh->dest; | |
a175a723 JS |
735 | |
736 | return 0; | |
737 | } | |
738 | ||
cf3266ad TZ |
739 | static int ovs_vport_output(struct net *net, struct sock *sk, |
740 | struct sk_buff *skb) | |
7f8a436e JS |
741 | { |
742 | struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage); | |
743 | struct vport *vport = data->vport; | |
744 | ||
745 | if (skb_cow_head(skb, data->l2_len) < 0) { | |
746 | kfree_skb(skb); | |
747 | return -ENOMEM; | |
748 | } | |
749 | ||
750 | __skb_dst_copy(skb, data->dst); | |
751 | *OVS_CB(skb) = data->cb; | |
752 | skb->inner_protocol = data->inner_protocol; | |
9df46aef MM |
753 | if (data->vlan_tci & VLAN_CFI_MASK) |
754 | __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK); | |
755 | else | |
756 | __vlan_hwaccel_clear_tag(skb); | |
7f8a436e JS |
757 | |
758 | /* Reconstruct the MAC header. */ | |
759 | skb_push(skb, data->l2_len); | |
760 | memcpy(skb->data, &data->l2_data, data->l2_len); | |
6b83d28a | 761 | skb_postpush_rcsum(skb, skb->data, data->l2_len); |
7f8a436e JS |
762 | skb_reset_mac_header(skb); |
763 | ||
c66549ff JB |
764 | if (eth_p_mpls(skb->protocol)) { |
765 | skb->inner_network_header = skb->network_header; | |
766 | skb_set_network_header(skb, data->network_offset); | |
767 | skb_reset_mac_len(skb); | |
768 | } | |
769 | ||
e2d9d835 | 770 | ovs_vport_send(vport, skb, data->mac_proto); |
7f8a436e JS |
771 | return 0; |
772 | } | |
773 | ||
774 | static unsigned int | |
775 | ovs_dst_get_mtu(const struct dst_entry *dst) | |
776 | { | |
777 | return dst->dev->mtu; | |
778 | } | |
779 | ||
780 | static struct dst_ops ovs_dst_ops = { | |
781 | .family = AF_UNSPEC, | |
782 | .mtu = ovs_dst_get_mtu, | |
783 | }; | |
784 | ||
785 | /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is | |
786 | * ovs_vport_output(), which is called once per fragmented packet. | |
787 | */ | |
c66549ff | 788 | static void prepare_frag(struct vport *vport, struct sk_buff *skb, |
e2d9d835 | 789 | u16 orig_network_offset, u8 mac_proto) |
7f8a436e JS |
790 | { |
791 | unsigned int hlen = skb_network_offset(skb); | |
792 | struct ovs_frag_data *data; | |
793 | ||
794 | data = this_cpu_ptr(&ovs_frag_data_storage); | |
795 | data->dst = skb->_skb_refdst; | |
796 | data->vport = vport; | |
797 | data->cb = *OVS_CB(skb); | |
798 | data->inner_protocol = skb->inner_protocol; | |
c66549ff | 799 | data->network_offset = orig_network_offset; |
9df46aef MM |
800 | if (skb_vlan_tag_present(skb)) |
801 | data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK; | |
802 | else | |
803 | data->vlan_tci = 0; | |
7f8a436e | 804 | data->vlan_proto = skb->vlan_proto; |
e2d9d835 | 805 | data->mac_proto = mac_proto; |
7f8a436e JS |
806 | data->l2_len = hlen; |
807 | memcpy(&data->l2_data, skb->data, hlen); | |
808 | ||
809 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
810 | skb_pull(skb, hlen); | |
811 | } | |
812 | ||
c559cd3a | 813 | static void ovs_fragment(struct net *net, struct vport *vport, |
e2d9d835 JB |
814 | struct sk_buff *skb, u16 mru, |
815 | struct sw_flow_key *key) | |
7f8a436e | 816 | { |
c66549ff JB |
817 | u16 orig_network_offset = 0; |
818 | ||
819 | if (eth_p_mpls(skb->protocol)) { | |
820 | orig_network_offset = skb_network_offset(skb); | |
821 | skb->network_header = skb->inner_network_header; | |
822 | } | |
823 | ||
7f8a436e JS |
824 | if (skb_network_offset(skb) > MAX_L2_LEN) { |
825 | OVS_NLERR(1, "L2 header too long to fragment"); | |
b8f22570 | 826 | goto err; |
7f8a436e JS |
827 | } |
828 | ||
e2d9d835 | 829 | if (key->eth.type == htons(ETH_P_IP)) { |
7f8a436e JS |
830 | struct dst_entry ovs_dst; |
831 | unsigned long orig_dst; | |
832 | ||
e2d9d835 JB |
833 | prepare_frag(vport, skb, orig_network_offset, |
834 | ovs_key_mac_proto(key)); | |
7f8a436e JS |
835 | dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1, |
836 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
837 | ovs_dst.dev = vport->dev; | |
838 | ||
839 | orig_dst = skb->_skb_refdst; | |
840 | skb_dst_set_noref(skb, &ovs_dst); | |
841 | IPCB(skb)->frag_max_size = mru; | |
842 | ||
694869b3 | 843 | ip_do_fragment(net, skb->sk, skb, ovs_vport_output); |
7f8a436e | 844 | refdst_drop(orig_dst); |
e2d9d835 | 845 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
7f8a436e JS |
846 | unsigned long orig_dst; |
847 | struct rt6_info ovs_rt; | |
848 | ||
e2d9d835 JB |
849 | prepare_frag(vport, skb, orig_network_offset, |
850 | ovs_key_mac_proto(key)); | |
7f8a436e JS |
851 | memset(&ovs_rt, 0, sizeof(ovs_rt)); |
852 | dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1, | |
853 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
854 | ovs_rt.dst.dev = vport->dev; | |
855 | ||
856 | orig_dst = skb->_skb_refdst; | |
857 | skb_dst_set_noref(skb, &ovs_rt.dst); | |
858 | IP6CB(skb)->frag_max_size = mru; | |
859 | ||
a7c978c6 | 860 | ipv6_stub->ipv6_fragment(net, skb->sk, skb, ovs_vport_output); |
7f8a436e JS |
861 | refdst_drop(orig_dst); |
862 | } else { | |
863 | WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.", | |
e2d9d835 | 864 | ovs_vport_name(vport), ntohs(key->eth.type), mru, |
7f8a436e | 865 | vport->dev->mtu); |
b8f22570 | 866 | goto err; |
7f8a436e | 867 | } |
b8f22570 JS |
868 | |
869 | return; | |
870 | err: | |
871 | kfree_skb(skb); | |
7f8a436e JS |
872 | } |
873 | ||
874 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port, | |
875 | struct sw_flow_key *key) | |
ccb1352e | 876 | { |
738967b8 | 877 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
ccb1352e | 878 | |
7f8a436e JS |
879 | if (likely(vport)) { |
880 | u16 mru = OVS_CB(skb)->mru; | |
f2a4d086 WT |
881 | u32 cutlen = OVS_CB(skb)->cutlen; |
882 | ||
883 | if (unlikely(cutlen > 0)) { | |
e2d9d835 | 884 | if (skb->len - cutlen > ovs_mac_header_len(key)) |
f2a4d086 WT |
885 | pskb_trim(skb, skb->len - cutlen); |
886 | else | |
e2d9d835 | 887 | pskb_trim(skb, ovs_mac_header_len(key)); |
f2a4d086 | 888 | } |
7f8a436e | 889 | |
738314a0 JB |
890 | if (likely(!mru || |
891 | (skb->len <= mru + vport->dev->hard_header_len))) { | |
e2d9d835 | 892 | ovs_vport_send(vport, skb, ovs_key_mac_proto(key)); |
7f8a436e | 893 | } else if (mru <= vport->dev->mtu) { |
c559cd3a | 894 | struct net *net = read_pnet(&dp->net); |
7f8a436e | 895 | |
e2d9d835 | 896 | ovs_fragment(net, vport, skb, mru, key); |
7f8a436e JS |
897 | } else { |
898 | kfree_skb(skb); | |
899 | } | |
900 | } else { | |
ccb1352e | 901 | kfree_skb(skb); |
7f8a436e | 902 | } |
ccb1352e JG |
903 | } |
904 | ||
905 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, | |
ccea7445 | 906 | struct sw_flow_key *key, const struct nlattr *attr, |
f2a4d086 WT |
907 | const struct nlattr *actions, int actions_len, |
908 | uint32_t cutlen) | |
ccb1352e JG |
909 | { |
910 | struct dp_upcall_info upcall; | |
911 | const struct nlattr *a; | |
912 | int rem; | |
913 | ||
ccea7445 | 914 | memset(&upcall, 0, sizeof(upcall)); |
ccb1352e | 915 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
7f8a436e | 916 | upcall.mru = OVS_CB(skb)->mru; |
ccb1352e JG |
917 | |
918 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
cf3266ad | 919 | a = nla_next(a, &rem)) { |
ccb1352e JG |
920 | switch (nla_type(a)) { |
921 | case OVS_USERSPACE_ATTR_USERDATA: | |
922 | upcall.userdata = a; | |
923 | break; | |
924 | ||
925 | case OVS_USERSPACE_ATTR_PID: | |
15e47304 | 926 | upcall.portid = nla_get_u32(a); |
ccb1352e | 927 | break; |
8f0aad6f WZ |
928 | |
929 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
930 | /* Get out tunnel info. */ | |
931 | struct vport *vport; | |
932 | ||
933 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
934 | if (vport) { | |
935 | int err; | |
936 | ||
fc4099f1 PS |
937 | err = dev_fill_metadata_dst(vport->dev, skb); |
938 | if (!err) | |
939 | upcall.egress_tun_info = skb_tunnel_info(skb); | |
8f0aad6f | 940 | } |
4c222798 | 941 | |
8f0aad6f | 942 | break; |
ccb1352e | 943 | } |
8f0aad6f | 944 | |
ccea7445 NM |
945 | case OVS_USERSPACE_ATTR_ACTIONS: { |
946 | /* Include actions. */ | |
947 | upcall.actions = actions; | |
948 | upcall.actions_len = actions_len; | |
949 | break; | |
950 | } | |
951 | ||
8f0aad6f | 952 | } /* End of switch. */ |
ccb1352e JG |
953 | } |
954 | ||
f2a4d086 | 955 | return ovs_dp_upcall(dp, skb, key, &upcall, cutlen); |
ccb1352e JG |
956 | } |
957 | ||
744676e7 MC |
958 | static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb, |
959 | struct sw_flow_key *key, | |
960 | const struct nlattr *attr, bool last) | |
961 | { | |
09d62172 EC |
962 | /* The first attribute is always 'OVS_DEC_TTL_ATTR_ACTION'. */ |
963 | struct nlattr *actions = nla_data(attr); | |
744676e7 | 964 | |
09d62172 EC |
965 | if (nla_len(actions)) |
966 | return clone_execute(dp, skb, key, 0, nla_data(actions), | |
967 | nla_len(actions), last, false); | |
744676e7 | 968 | |
744676e7 MC |
969 | consume_skb(skb); |
970 | return 0; | |
971 | } | |
972 | ||
798c1661 | 973 | /* When 'last' is true, sample() should always consume the 'skb'. |
974 | * Otherwise, sample() should keep 'skb' intact regardless what | |
975 | * actions are executed within sample(). | |
976 | */ | |
ccb1352e | 977 | static int sample(struct datapath *dp, struct sk_buff *skb, |
ccea7445 | 978 | struct sw_flow_key *key, const struct nlattr *attr, |
798c1661 | 979 | bool last) |
ccb1352e | 980 | { |
798c1661 | 981 | struct nlattr *actions; |
982 | struct nlattr *sample_arg; | |
798c1661 | 983 | int rem = nla_len(attr); |
798c1661 | 984 | const struct sample_arg *arg; |
bef7f756 | 985 | bool clone_flow_key; |
ccb1352e | 986 | |
798c1661 | 987 | /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */ |
988 | sample_arg = nla_data(attr); | |
989 | arg = nla_data(sample_arg); | |
990 | actions = nla_next(sample_arg, &rem); | |
e05176a3 | 991 | |
798c1661 | 992 | if ((arg->probability != U32_MAX) && |
993 | (!arg->probability || prandom_u32() > arg->probability)) { | |
994 | if (last) | |
995 | consume_skb(skb); | |
996 | return 0; | |
ccb1352e JG |
997 | } |
998 | ||
bef7f756 | 999 | clone_flow_key = !arg->exec; |
1000 | return clone_execute(dp, skb, key, 0, actions, rem, last, | |
1001 | clone_flow_key); | |
971427f3 AZ |
1002 | } |
1003 | ||
b2335040 YS |
1004 | /* When 'last' is true, clone() should always consume the 'skb'. |
1005 | * Otherwise, clone() should keep 'skb' intact regardless what | |
1006 | * actions are executed within clone(). | |
1007 | */ | |
1008 | static int clone(struct datapath *dp, struct sk_buff *skb, | |
1009 | struct sw_flow_key *key, const struct nlattr *attr, | |
1010 | bool last) | |
1011 | { | |
1012 | struct nlattr *actions; | |
1013 | struct nlattr *clone_arg; | |
1014 | int rem = nla_len(attr); | |
1015 | bool dont_clone_flow_key; | |
1016 | ||
1017 | /* The first action is always 'OVS_CLONE_ATTR_ARG'. */ | |
1018 | clone_arg = nla_data(attr); | |
1019 | dont_clone_flow_key = nla_get_u32(clone_arg); | |
1020 | actions = nla_next(clone_arg, &rem); | |
1021 | ||
1022 | return clone_execute(dp, skb, key, 0, actions, rem, last, | |
1023 | !dont_clone_flow_key); | |
1024 | } | |
1025 | ||
971427f3 AZ |
1026 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, |
1027 | const struct nlattr *attr) | |
1028 | { | |
1029 | struct ovs_action_hash *hash_act = nla_data(attr); | |
1030 | u32 hash = 0; | |
1031 | ||
1032 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
1033 | hash = skb_get_hash(skb); | |
1034 | hash = jhash_1word(hash, hash_act->hash_basis); | |
1035 | if (!hash) | |
1036 | hash = 0x1; | |
1037 | ||
1038 | key->ovs_flow_hash = hash; | |
ccb1352e JG |
1039 | } |
1040 | ||
83d2b9ba JR |
1041 | static int execute_set_action(struct sk_buff *skb, |
1042 | struct sw_flow_key *flow_key, | |
1043 | const struct nlattr *a) | |
1044 | { | |
1045 | /* Only tunnel set execution is supported without a mask. */ | |
1046 | if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) { | |
34ae932a TG |
1047 | struct ovs_tunnel_info *tun = nla_data(a); |
1048 | ||
1049 | skb_dst_drop(skb); | |
1050 | dst_hold((struct dst_entry *)tun->tun_dst); | |
1051 | skb_dst_set(skb, (struct dst_entry *)tun->tun_dst); | |
83d2b9ba JR |
1052 | return 0; |
1053 | } | |
1054 | ||
1055 | return -EINVAL; | |
1056 | } | |
1057 | ||
1058 | /* Mask is at the midpoint of the data. */ | |
1059 | #define get_mask(a, type) ((const type)nla_data(a) + 1) | |
1060 | ||
1061 | static int execute_masked_set_action(struct sk_buff *skb, | |
1062 | struct sw_flow_key *flow_key, | |
1063 | const struct nlattr *a) | |
ccb1352e JG |
1064 | { |
1065 | int err = 0; | |
1066 | ||
83d2b9ba | 1067 | switch (nla_type(a)) { |
ccb1352e | 1068 | case OVS_KEY_ATTR_PRIORITY: |
be26b9a8 JS |
1069 | OVS_SET_MASKED(skb->priority, nla_get_u32(a), |
1070 | *get_mask(a, u32 *)); | |
83d2b9ba | 1071 | flow_key->phy.priority = skb->priority; |
ccb1352e JG |
1072 | break; |
1073 | ||
39c7caeb | 1074 | case OVS_KEY_ATTR_SKB_MARK: |
be26b9a8 | 1075 | OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *)); |
83d2b9ba | 1076 | flow_key->phy.skb_mark = skb->mark; |
39c7caeb AA |
1077 | break; |
1078 | ||
f0b128c1 | 1079 | case OVS_KEY_ATTR_TUNNEL_INFO: |
83d2b9ba JR |
1080 | /* Masked data not supported for tunnel. */ |
1081 | err = -EINVAL; | |
7d5437c7 PS |
1082 | break; |
1083 | ||
ccb1352e | 1084 | case OVS_KEY_ATTR_ETHERNET: |
83d2b9ba JR |
1085 | err = set_eth_addr(skb, flow_key, nla_data(a), |
1086 | get_mask(a, struct ovs_key_ethernet *)); | |
ccb1352e JG |
1087 | break; |
1088 | ||
b2d0f5d5 YY |
1089 | case OVS_KEY_ATTR_NSH: |
1090 | err = set_nsh(skb, flow_key, a); | |
1091 | break; | |
1092 | ||
ccb1352e | 1093 | case OVS_KEY_ATTR_IPV4: |
83d2b9ba JR |
1094 | err = set_ipv4(skb, flow_key, nla_data(a), |
1095 | get_mask(a, struct ovs_key_ipv4 *)); | |
ccb1352e JG |
1096 | break; |
1097 | ||
3fdbd1ce | 1098 | case OVS_KEY_ATTR_IPV6: |
83d2b9ba JR |
1099 | err = set_ipv6(skb, flow_key, nla_data(a), |
1100 | get_mask(a, struct ovs_key_ipv6 *)); | |
3fdbd1ce AA |
1101 | break; |
1102 | ||
ccb1352e | 1103 | case OVS_KEY_ATTR_TCP: |
83d2b9ba JR |
1104 | err = set_tcp(skb, flow_key, nla_data(a), |
1105 | get_mask(a, struct ovs_key_tcp *)); | |
ccb1352e JG |
1106 | break; |
1107 | ||
1108 | case OVS_KEY_ATTR_UDP: | |
83d2b9ba JR |
1109 | err = set_udp(skb, flow_key, nla_data(a), |
1110 | get_mask(a, struct ovs_key_udp *)); | |
ccb1352e | 1111 | break; |
a175a723 JS |
1112 | |
1113 | case OVS_KEY_ATTR_SCTP: | |
83d2b9ba JR |
1114 | err = set_sctp(skb, flow_key, nla_data(a), |
1115 | get_mask(a, struct ovs_key_sctp *)); | |
a175a723 | 1116 | break; |
25cd9ba0 SH |
1117 | |
1118 | case OVS_KEY_ATTR_MPLS: | |
83d2b9ba JR |
1119 | err = set_mpls(skb, flow_key, nla_data(a), get_mask(a, |
1120 | __be32 *)); | |
25cd9ba0 | 1121 | break; |
7f8a436e JS |
1122 | |
1123 | case OVS_KEY_ATTR_CT_STATE: | |
1124 | case OVS_KEY_ATTR_CT_ZONE: | |
182e3042 | 1125 | case OVS_KEY_ATTR_CT_MARK: |
33db4125 | 1126 | case OVS_KEY_ATTR_CT_LABELS: |
9dd7f890 JR |
1127 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4: |
1128 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6: | |
7f8a436e JS |
1129 | err = -EINVAL; |
1130 | break; | |
ccb1352e JG |
1131 | } |
1132 | ||
1133 | return err; | |
1134 | } | |
1135 | ||
971427f3 AZ |
1136 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
1137 | struct sw_flow_key *key, | |
bef7f756 | 1138 | const struct nlattr *a, bool last) |
971427f3 | 1139 | { |
bef7f756 | 1140 | u32 recirc_id; |
971427f3 | 1141 | |
fff06c36 PS |
1142 | if (!is_flow_key_valid(key)) { |
1143 | int err; | |
1144 | ||
1145 | err = ovs_flow_key_update(skb, key); | |
1146 | if (err) | |
1147 | return err; | |
1148 | } | |
1149 | BUG_ON(!is_flow_key_valid(key)); | |
971427f3 | 1150 | |
bef7f756 | 1151 | recirc_id = nla_get_u32(a); |
1152 | return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true); | |
971427f3 AZ |
1153 | } |
1154 | ||
4d5ec89f NS |
1155 | static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb, |
1156 | struct sw_flow_key *key, | |
1157 | const struct nlattr *attr, bool last) | |
1158 | { | |
17843655 | 1159 | struct ovs_skb_cb *ovs_cb = OVS_CB(skb); |
4d5ec89f | 1160 | const struct nlattr *actions, *cpl_arg; |
17843655 | 1161 | int len, max_len, rem = nla_len(attr); |
4d5ec89f | 1162 | const struct check_pkt_len_arg *arg; |
4d5ec89f NS |
1163 | bool clone_flow_key; |
1164 | ||
1165 | /* The first netlink attribute in 'attr' is always | |
1166 | * 'OVS_CHECK_PKT_LEN_ATTR_ARG'. | |
1167 | */ | |
1168 | cpl_arg = nla_data(attr); | |
1169 | arg = nla_data(cpl_arg); | |
1170 | ||
17843655 LB |
1171 | len = ovs_cb->mru ? ovs_cb->mru + skb->mac_len : skb->len; |
1172 | max_len = arg->pkt_len; | |
1173 | ||
1174 | if ((skb_is_gso(skb) && skb_gso_validate_mac_len(skb, max_len)) || | |
1175 | len <= max_len) { | |
4d5ec89f NS |
1176 | /* Second netlink attribute in 'attr' is always |
1177 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'. | |
1178 | */ | |
1179 | actions = nla_next(cpl_arg, &rem); | |
1180 | clone_flow_key = !arg->exec_for_lesser_equal; | |
1181 | } else { | |
1182 | /* Third netlink attribute in 'attr' is always | |
1183 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'. | |
1184 | */ | |
1185 | actions = nla_next(cpl_arg, &rem); | |
1186 | actions = nla_next(actions, &rem); | |
1187 | clone_flow_key = !arg->exec_for_greater; | |
1188 | } | |
1189 | ||
1190 | return clone_execute(dp, skb, key, 0, nla_data(actions), | |
1191 | nla_len(actions), last, clone_flow_key); | |
1192 | } | |
1193 | ||
744676e7 MC |
1194 | static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key) |
1195 | { | |
1196 | int err; | |
1197 | ||
1198 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
1199 | struct ipv6hdr *nh; | |
1200 | ||
1201 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
1202 | sizeof(*nh)); | |
1203 | if (unlikely(err)) | |
1204 | return err; | |
1205 | ||
1206 | nh = ipv6_hdr(skb); | |
1207 | ||
1208 | if (nh->hop_limit <= 1) | |
1209 | return -EHOSTUNREACH; | |
1210 | ||
1211 | key->ip.ttl = --nh->hop_limit; | |
09d62172 | 1212 | } else if (skb->protocol == htons(ETH_P_IP)) { |
744676e7 MC |
1213 | struct iphdr *nh; |
1214 | u8 old_ttl; | |
1215 | ||
1216 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
1217 | sizeof(*nh)); | |
1218 | if (unlikely(err)) | |
1219 | return err; | |
1220 | ||
1221 | nh = ip_hdr(skb); | |
1222 | if (nh->ttl <= 1) | |
1223 | return -EHOSTUNREACH; | |
1224 | ||
1225 | old_ttl = nh->ttl--; | |
1226 | csum_replace2(&nh->check, htons(old_ttl << 8), | |
1227 | htons(nh->ttl << 8)); | |
1228 | key->ip.ttl = nh->ttl; | |
1229 | } | |
1230 | return 0; | |
1231 | } | |
1232 | ||
ccb1352e JG |
1233 | /* Execute a list of actions against 'skb'. */ |
1234 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 1235 | struct sw_flow_key *key, |
651887b0 | 1236 | const struct nlattr *attr, int len) |
ccb1352e | 1237 | { |
ccb1352e JG |
1238 | const struct nlattr *a; |
1239 | int rem; | |
1240 | ||
1241 | for (a = attr, rem = len; rem > 0; | |
1242 | a = nla_next(a, &rem)) { | |
1243 | int err = 0; | |
1244 | ||
5b8784aa | 1245 | switch (nla_type(a)) { |
1246 | case OVS_ACTION_ATTR_OUTPUT: { | |
1247 | int port = nla_get_u32(a); | |
1248 | struct sk_buff *clone; | |
1249 | ||
1250 | /* Every output action needs a separate clone | |
1251 | * of 'skb', In case the output action is the | |
1252 | * last action, cloning can be avoided. | |
1253 | */ | |
1254 | if (nla_is_last(a, rem)) { | |
1255 | do_output(dp, skb, port, key); | |
1256 | /* 'skb' has been used for output. | |
1257 | */ | |
1258 | return 0; | |
1259 | } | |
738967b8 | 1260 | |
5b8784aa | 1261 | clone = skb_clone(skb, GFP_ATOMIC); |
1262 | if (clone) | |
1263 | do_output(dp, clone, port, key); | |
f2a4d086 | 1264 | OVS_CB(skb)->cutlen = 0; |
ccb1352e | 1265 | break; |
5b8784aa | 1266 | } |
ccb1352e | 1267 | |
f2a4d086 WT |
1268 | case OVS_ACTION_ATTR_TRUNC: { |
1269 | struct ovs_action_trunc *trunc = nla_data(a); | |
1270 | ||
1271 | if (skb->len > trunc->max_len) | |
1272 | OVS_CB(skb)->cutlen = skb->len - trunc->max_len; | |
1273 | break; | |
1274 | } | |
1275 | ||
ccb1352e | 1276 | case OVS_ACTION_ATTR_USERSPACE: |
f2a4d086 WT |
1277 | output_userspace(dp, skb, key, a, attr, |
1278 | len, OVS_CB(skb)->cutlen); | |
1279 | OVS_CB(skb)->cutlen = 0; | |
ccb1352e JG |
1280 | break; |
1281 | ||
971427f3 AZ |
1282 | case OVS_ACTION_ATTR_HASH: |
1283 | execute_hash(skb, key, a); | |
1284 | break; | |
1285 | ||
f66b53fd MV |
1286 | case OVS_ACTION_ATTR_PUSH_MPLS: { |
1287 | struct ovs_action_push_mpls *mpls = nla_data(a); | |
1288 | ||
1289 | err = push_mpls(skb, key, mpls->mpls_lse, | |
1290 | mpls->mpls_ethertype, skb->mac_len); | |
25cd9ba0 | 1291 | break; |
f66b53fd MV |
1292 | } |
1293 | case OVS_ACTION_ATTR_ADD_MPLS: { | |
1294 | struct ovs_action_add_mpls *mpls = nla_data(a); | |
1295 | __u16 mac_len = 0; | |
1296 | ||
1297 | if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) | |
1298 | mac_len = skb->mac_len; | |
25cd9ba0 | 1299 | |
f66b53fd MV |
1300 | err = push_mpls(skb, key, mpls->mpls_lse, |
1301 | mpls->mpls_ethertype, mac_len); | |
1302 | break; | |
1303 | } | |
25cd9ba0 | 1304 | case OVS_ACTION_ATTR_POP_MPLS: |
fff06c36 | 1305 | err = pop_mpls(skb, key, nla_get_be16(a)); |
25cd9ba0 SH |
1306 | break; |
1307 | ||
ccb1352e | 1308 | case OVS_ACTION_ATTR_PUSH_VLAN: |
fff06c36 | 1309 | err = push_vlan(skb, key, nla_data(a)); |
ccb1352e JG |
1310 | break; |
1311 | ||
1312 | case OVS_ACTION_ATTR_POP_VLAN: | |
fff06c36 | 1313 | err = pop_vlan(skb, key); |
ccb1352e JG |
1314 | break; |
1315 | ||
bef7f756 | 1316 | case OVS_ACTION_ATTR_RECIRC: { |
1317 | bool last = nla_is_last(a, rem); | |
1318 | ||
1319 | err = execute_recirc(dp, skb, key, a, last); | |
1320 | if (last) { | |
971427f3 AZ |
1321 | /* If this is the last action, the skb has |
1322 | * been consumed or freed. | |
1323 | * Return immediately. | |
1324 | */ | |
1325 | return err; | |
1326 | } | |
1327 | break; | |
bef7f756 | 1328 | } |
971427f3 | 1329 | |
ccb1352e | 1330 | case OVS_ACTION_ATTR_SET: |
fff06c36 | 1331 | err = execute_set_action(skb, key, nla_data(a)); |
ccb1352e JG |
1332 | break; |
1333 | ||
83d2b9ba JR |
1334 | case OVS_ACTION_ATTR_SET_MASKED: |
1335 | case OVS_ACTION_ATTR_SET_TO_MASKED: | |
1336 | err = execute_masked_set_action(skb, key, nla_data(a)); | |
1337 | break; | |
1338 | ||
798c1661 | 1339 | case OVS_ACTION_ATTR_SAMPLE: { |
1340 | bool last = nla_is_last(a, rem); | |
1341 | ||
1342 | err = sample(dp, skb, key, a, last); | |
1343 | if (last) | |
1344 | return err; | |
1345 | ||
ccb1352e | 1346 | break; |
798c1661 | 1347 | } |
7f8a436e JS |
1348 | |
1349 | case OVS_ACTION_ATTR_CT: | |
ec0d043d JS |
1350 | if (!is_flow_key_valid(key)) { |
1351 | err = ovs_flow_key_update(skb, key); | |
1352 | if (err) | |
1353 | return err; | |
1354 | } | |
1355 | ||
7f8a436e JS |
1356 | err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key, |
1357 | nla_data(a)); | |
1358 | ||
1359 | /* Hide stolen IP fragments from user space. */ | |
74c16618 JS |
1360 | if (err) |
1361 | return err == -EINPROGRESS ? 0 : err; | |
7f8a436e | 1362 | break; |
91820da6 | 1363 | |
b8226962 EG |
1364 | case OVS_ACTION_ATTR_CT_CLEAR: |
1365 | err = ovs_ct_clear(skb, key); | |
1366 | break; | |
1367 | ||
91820da6 JB |
1368 | case OVS_ACTION_ATTR_PUSH_ETH: |
1369 | err = push_eth(skb, key, nla_data(a)); | |
1370 | break; | |
1371 | ||
1372 | case OVS_ACTION_ATTR_POP_ETH: | |
1373 | err = pop_eth(skb, key); | |
1374 | break; | |
b2d0f5d5 YY |
1375 | |
1376 | case OVS_ACTION_ATTR_PUSH_NSH: { | |
1377 | u8 buffer[NSH_HDR_MAX_LEN]; | |
1378 | struct nshhdr *nh = (struct nshhdr *)buffer; | |
1379 | ||
1380 | err = nsh_hdr_from_nlattr(nla_data(a), nh, | |
1381 | NSH_HDR_MAX_LEN); | |
1382 | if (unlikely(err)) | |
1383 | break; | |
1384 | err = push_nsh(skb, key, nh); | |
1385 | break; | |
1386 | } | |
1387 | ||
1388 | case OVS_ACTION_ATTR_POP_NSH: | |
1389 | err = pop_nsh(skb, key); | |
1390 | break; | |
cd8a6c33 AZ |
1391 | |
1392 | case OVS_ACTION_ATTR_METER: | |
1393 | if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) { | |
1394 | consume_skb(skb); | |
1395 | return 0; | |
1396 | } | |
b2335040 YS |
1397 | break; |
1398 | ||
1399 | case OVS_ACTION_ATTR_CLONE: { | |
1400 | bool last = nla_is_last(a, rem); | |
1401 | ||
1402 | err = clone(dp, skb, key, a, last); | |
1403 | if (last) | |
1404 | return err; | |
1405 | ||
1406 | break; | |
1407 | } | |
4d5ec89f NS |
1408 | |
1409 | case OVS_ACTION_ATTR_CHECK_PKT_LEN: { | |
1410 | bool last = nla_is_last(a, rem); | |
1411 | ||
1412 | err = execute_check_pkt_len(dp, skb, key, a, last); | |
1413 | if (last) | |
1414 | return err; | |
1415 | ||
1416 | break; | |
1417 | } | |
744676e7 MC |
1418 | |
1419 | case OVS_ACTION_ATTR_DEC_TTL: | |
1420 | err = execute_dec_ttl(skb, key); | |
1421 | if (err == -EHOSTUNREACH) { | |
1422 | err = dec_ttl_exception_handler(dp, skb, key, | |
1423 | a, true); | |
1424 | return err; | |
1425 | } | |
1426 | break; | |
ccb1352e JG |
1427 | } |
1428 | ||
1429 | if (unlikely(err)) { | |
1430 | kfree_skb(skb); | |
1431 | return err; | |
1432 | } | |
1433 | } | |
1434 | ||
5b8784aa | 1435 | consume_skb(skb); |
ccb1352e JG |
1436 | return 0; |
1437 | } | |
1438 | ||
bef7f756 | 1439 | /* Execute the actions on the clone of the packet. The effect of the |
1440 | * execution does not affect the original 'skb' nor the original 'key'. | |
1441 | * | |
1442 | * The execution may be deferred in case the actions can not be executed | |
1443 | * immediately. | |
1444 | */ | |
1445 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, | |
1446 | struct sw_flow_key *key, u32 recirc_id, | |
1447 | const struct nlattr *actions, int len, | |
1448 | bool last, bool clone_flow_key) | |
1449 | { | |
1450 | struct deferred_action *da; | |
1451 | struct sw_flow_key *clone; | |
1452 | ||
1453 | skb = last ? skb : skb_clone(skb, GFP_ATOMIC); | |
1454 | if (!skb) { | |
1455 | /* Out of memory, skip this action. | |
1456 | */ | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | /* When clone_flow_key is false, the 'key' will not be change | |
1461 | * by the actions, then the 'key' can be used directly. | |
1462 | * Otherwise, try to clone key from the next recursion level of | |
1463 | * 'flow_keys'. If clone is successful, execute the actions | |
1464 | * without deferring. | |
1465 | */ | |
1466 | clone = clone_flow_key ? clone_key(key) : key; | |
1467 | if (clone) { | |
1468 | int err = 0; | |
1469 | ||
1470 | if (actions) { /* Sample action */ | |
1471 | if (clone_flow_key) | |
1472 | __this_cpu_inc(exec_actions_level); | |
1473 | ||
1474 | err = do_execute_actions(dp, skb, clone, | |
1475 | actions, len); | |
1476 | ||
1477 | if (clone_flow_key) | |
1478 | __this_cpu_dec(exec_actions_level); | |
1479 | } else { /* Recirc action */ | |
1480 | clone->recirc_id = recirc_id; | |
1481 | ovs_dp_process_packet(skb, clone); | |
1482 | } | |
1483 | return err; | |
1484 | } | |
1485 | ||
1486 | /* Out of 'flow_keys' space. Defer actions */ | |
1487 | da = add_deferred_actions(skb, key, actions, len); | |
1488 | if (da) { | |
1489 | if (!actions) { /* Recirc action */ | |
1490 | key = &da->pkt_key; | |
1491 | key->recirc_id = recirc_id; | |
1492 | } | |
1493 | } else { | |
1494 | /* Out of per CPU action FIFO space. Drop the 'skb' and | |
1495 | * log an error. | |
1496 | */ | |
1497 | kfree_skb(skb); | |
1498 | ||
1499 | if (net_ratelimit()) { | |
1500 | if (actions) { /* Sample action */ | |
1501 | pr_warn("%s: deferred action limit reached, drop sample action\n", | |
1502 | ovs_dp_name(dp)); | |
1503 | } else { /* Recirc action */ | |
1504 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
1505 | ovs_dp_name(dp)); | |
1506 | } | |
1507 | } | |
1508 | } | |
1509 | return 0; | |
1510 | } | |
1511 | ||
971427f3 AZ |
1512 | static void process_deferred_actions(struct datapath *dp) |
1513 | { | |
1514 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
1515 | ||
1516 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
1517 | if (action_fifo_is_empty(fifo)) | |
1518 | return; | |
1519 | ||
1520 | /* Finishing executing all deferred actions. */ | |
1521 | do { | |
1522 | struct deferred_action *da = action_fifo_get(fifo); | |
1523 | struct sk_buff *skb = da->skb; | |
1524 | struct sw_flow_key *key = &da->pkt_key; | |
1525 | const struct nlattr *actions = da->actions; | |
47c697aa | 1526 | int actions_len = da->actions_len; |
971427f3 AZ |
1527 | |
1528 | if (actions) | |
47c697aa | 1529 | do_execute_actions(dp, skb, key, actions, actions_len); |
971427f3 AZ |
1530 | else |
1531 | ovs_dp_process_packet(skb, key); | |
1532 | } while (!action_fifo_is_empty(fifo)); | |
1533 | ||
1534 | /* Reset FIFO for the next packet. */ | |
1535 | action_fifo_init(fifo); | |
1536 | } | |
1537 | ||
ccb1352e | 1538 | /* Execute a list of actions against 'skb'. */ |
2ff3e4e4 | 1539 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
12eb18f7 TG |
1540 | const struct sw_flow_actions *acts, |
1541 | struct sw_flow_key *key) | |
ccb1352e | 1542 | { |
b064d0d8 HFS |
1543 | int err, level; |
1544 | ||
1545 | level = __this_cpu_inc_return(exec_actions_level); | |
2679d040 | 1546 | if (unlikely(level > OVS_RECURSION_LIMIT)) { |
b064d0d8 HFS |
1547 | net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n", |
1548 | ovs_dp_name(dp)); | |
1549 | kfree_skb(skb); | |
1550 | err = -ENETDOWN; | |
1551 | goto out; | |
1552 | } | |
971427f3 | 1553 | |
494bea39 | 1554 | OVS_CB(skb)->acts_origlen = acts->orig_len; |
971427f3 AZ |
1555 | err = do_execute_actions(dp, skb, key, |
1556 | acts->actions, acts->actions_len); | |
1557 | ||
b064d0d8 | 1558 | if (level == 1) |
971427f3 AZ |
1559 | process_deferred_actions(dp); |
1560 | ||
b064d0d8 HFS |
1561 | out: |
1562 | __this_cpu_dec(exec_actions_level); | |
971427f3 AZ |
1563 | return err; |
1564 | } | |
1565 | ||
1566 | int action_fifos_init(void) | |
1567 | { | |
1568 | action_fifos = alloc_percpu(struct action_fifo); | |
1569 | if (!action_fifos) | |
1570 | return -ENOMEM; | |
ccb1352e | 1571 | |
4572ef52 | 1572 | flow_keys = alloc_percpu(struct action_flow_keys); |
1573 | if (!flow_keys) { | |
2679d040 LR |
1574 | free_percpu(action_fifos); |
1575 | return -ENOMEM; | |
1576 | } | |
1577 | ||
971427f3 AZ |
1578 | return 0; |
1579 | } | |
1580 | ||
1581 | void action_fifos_exit(void) | |
1582 | { | |
1583 | free_percpu(action_fifos); | |
4572ef52 | 1584 | free_percpu(flow_keys); |
ccb1352e | 1585 | } |