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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" |
c4ab7b56 | 33 | #include "openvswitch_trace.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 | ||
43c13605 DC |
203 | if (!pskb_may_pull(skb, skb_network_offset(skb) + MPLS_HLEN)) |
204 | return -ENOMEM; | |
205 | ||
85de4a21 JB |
206 | stack = mpls_hdr(skb); |
207 | lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask); | |
d27cf5c5 JH |
208 | err = skb_mpls_update_lse(skb, lse); |
209 | if (err) | |
210 | return err; | |
25cd9ba0 | 211 | |
fbdcdd78 | 212 | flow_key->mpls.lse[0] = lse; |
25cd9ba0 SH |
213 | return 0; |
214 | } | |
215 | ||
fff06c36 | 216 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e | 217 | { |
ccb1352e JG |
218 | int err; |
219 | ||
93515d53 | 220 | err = skb_vlan_pop(skb); |
018c1dda | 221 | if (skb_vlan_tag_present(skb)) { |
93515d53 | 222 | invalidate_flow_key(key); |
018c1dda EG |
223 | } else { |
224 | key->eth.vlan.tci = 0; | |
225 | key->eth.vlan.tpid = 0; | |
226 | } | |
93515d53 | 227 | return err; |
ccb1352e JG |
228 | } |
229 | ||
fff06c36 PS |
230 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
231 | const struct ovs_action_push_vlan *vlan) | |
ccb1352e | 232 | { |
018c1dda | 233 | if (skb_vlan_tag_present(skb)) { |
fff06c36 | 234 | invalidate_flow_key(key); |
018c1dda EG |
235 | } else { |
236 | key->eth.vlan.tci = vlan->vlan_tci; | |
237 | key->eth.vlan.tpid = vlan->vlan_tpid; | |
238 | } | |
93515d53 | 239 | return skb_vlan_push(skb, vlan->vlan_tpid, |
9df46aef | 240 | ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK); |
ccb1352e JG |
241 | } |
242 | ||
83d2b9ba JR |
243 | /* 'src' is already properly masked. */ |
244 | static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_) | |
245 | { | |
246 | u16 *dst = (u16 *)dst_; | |
247 | const u16 *src = (const u16 *)src_; | |
248 | const u16 *mask = (const u16 *)mask_; | |
249 | ||
be26b9a8 JS |
250 | OVS_SET_MASKED(dst[0], src[0], mask[0]); |
251 | OVS_SET_MASKED(dst[1], src[1], mask[1]); | |
252 | OVS_SET_MASKED(dst[2], src[2], mask[2]); | |
83d2b9ba JR |
253 | } |
254 | ||
255 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
256 | const struct ovs_key_ethernet *key, | |
257 | const struct ovs_key_ethernet *mask) | |
ccb1352e JG |
258 | { |
259 | int err; | |
83d2b9ba | 260 | |
e2195121 | 261 | err = skb_ensure_writable(skb, ETH_HLEN); |
ccb1352e JG |
262 | if (unlikely(err)) |
263 | return err; | |
264 | ||
b34df5e8 PS |
265 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
266 | ||
83d2b9ba JR |
267 | ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src, |
268 | mask->eth_src); | |
269 | ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst, | |
270 | mask->eth_dst); | |
ccb1352e | 271 | |
6b83d28a | 272 | skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
b34df5e8 | 273 | |
83d2b9ba JR |
274 | ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source); |
275 | ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest); | |
ccb1352e JG |
276 | return 0; |
277 | } | |
278 | ||
91820da6 JB |
279 | /* pop_eth does not support VLAN packets as this action is never called |
280 | * for them. | |
281 | */ | |
282 | static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key) | |
283 | { | |
19fbcb36 GN |
284 | int err; |
285 | ||
286 | err = skb_eth_pop(skb); | |
287 | if (err) | |
288 | return err; | |
91820da6 JB |
289 | |
290 | /* safe right before invalidate_flow_key */ | |
291 | key->mac_proto = MAC_PROTO_NONE; | |
292 | invalidate_flow_key(key); | |
293 | return 0; | |
294 | } | |
295 | ||
296 | static int push_eth(struct sk_buff *skb, struct sw_flow_key *key, | |
297 | const struct ovs_action_push_eth *ethh) | |
298 | { | |
19fbcb36 | 299 | int err; |
91820da6 | 300 | |
19fbcb36 GN |
301 | err = skb_eth_push(skb, ethh->addresses.eth_dst, |
302 | ethh->addresses.eth_src); | |
303 | if (err) | |
304 | return err; | |
91820da6 JB |
305 | |
306 | /* safe right before invalidate_flow_key */ | |
307 | key->mac_proto = MAC_PROTO_ETHERNET; | |
308 | invalidate_flow_key(key); | |
309 | return 0; | |
310 | } | |
311 | ||
b2d0f5d5 YY |
312 | static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key, |
313 | const struct nshhdr *nh) | |
314 | { | |
315 | int err; | |
316 | ||
317 | err = nsh_push(skb, nh); | |
318 | if (err) | |
319 | return err; | |
320 | ||
321 | /* safe right before invalidate_flow_key */ | |
322 | key->mac_proto = MAC_PROTO_NONE; | |
323 | invalidate_flow_key(key); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key) | |
328 | { | |
329 | int err; | |
330 | ||
331 | err = nsh_pop(skb); | |
332 | if (err) | |
333 | return err; | |
334 | ||
335 | /* safe right before invalidate_flow_key */ | |
336 | if (skb->protocol == htons(ETH_P_TEB)) | |
337 | key->mac_proto = MAC_PROTO_ETHERNET; | |
338 | else | |
339 | key->mac_proto = MAC_PROTO_NONE; | |
340 | invalidate_flow_key(key); | |
341 | return 0; | |
342 | } | |
343 | ||
3576fd79 GG |
344 | static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh, |
345 | __be32 addr, __be32 new_addr) | |
ccb1352e JG |
346 | { |
347 | int transport_len = skb->len - skb_transport_offset(skb); | |
348 | ||
3576fd79 GG |
349 | if (nh->frag_off & htons(IP_OFFSET)) |
350 | return; | |
351 | ||
ccb1352e JG |
352 | if (nh->protocol == IPPROTO_TCP) { |
353 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
354 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, | |
4b048d6d | 355 | addr, new_addr, true); |
ccb1352e | 356 | } else if (nh->protocol == IPPROTO_UDP) { |
81e5d41d JG |
357 | if (likely(transport_len >= sizeof(struct udphdr))) { |
358 | struct udphdr *uh = udp_hdr(skb); | |
359 | ||
360 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
361 | inet_proto_csum_replace4(&uh->check, skb, | |
4b048d6d | 362 | addr, new_addr, true); |
81e5d41d JG |
363 | if (!uh->check) |
364 | uh->check = CSUM_MANGLED_0; | |
365 | } | |
366 | } | |
ccb1352e | 367 | } |
3576fd79 | 368 | } |
ccb1352e | 369 | |
3576fd79 GG |
370 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
371 | __be32 *addr, __be32 new_addr) | |
372 | { | |
373 | update_ip_l4_checksum(skb, nh, *addr, new_addr); | |
ccb1352e | 374 | csum_replace4(&nh->check, *addr, new_addr); |
7539fadc | 375 | skb_clear_hash(skb); |
a4c41688 | 376 | ovs_ct_clear(skb, NULL); |
ccb1352e JG |
377 | *addr = new_addr; |
378 | } | |
379 | ||
3fdbd1ce AA |
380 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
381 | __be32 addr[4], const __be32 new_addr[4]) | |
382 | { | |
383 | int transport_len = skb->len - skb_transport_offset(skb); | |
384 | ||
856447d0 | 385 | if (l4_proto == NEXTHDR_TCP) { |
3fdbd1ce AA |
386 | if (likely(transport_len >= sizeof(struct tcphdr))) |
387 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
4b048d6d | 388 | addr, new_addr, true); |
856447d0 | 389 | } else if (l4_proto == NEXTHDR_UDP) { |
3fdbd1ce AA |
390 | if (likely(transport_len >= sizeof(struct udphdr))) { |
391 | struct udphdr *uh = udp_hdr(skb); | |
392 | ||
393 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
394 | inet_proto_csum_replace16(&uh->check, skb, | |
4b048d6d | 395 | addr, new_addr, true); |
3fdbd1ce AA |
396 | if (!uh->check) |
397 | uh->check = CSUM_MANGLED_0; | |
398 | } | |
399 | } | |
856447d0 JG |
400 | } else if (l4_proto == NEXTHDR_ICMP) { |
401 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
402 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
4b048d6d | 403 | skb, addr, new_addr, true); |
3fdbd1ce AA |
404 | } |
405 | } | |
406 | ||
83d2b9ba JR |
407 | static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4], |
408 | const __be32 mask[4], __be32 masked[4]) | |
409 | { | |
be26b9a8 JS |
410 | masked[0] = OVS_MASKED(old[0], addr[0], mask[0]); |
411 | masked[1] = OVS_MASKED(old[1], addr[1], mask[1]); | |
412 | masked[2] = OVS_MASKED(old[2], addr[2], mask[2]); | |
413 | masked[3] = OVS_MASKED(old[3], addr[3], mask[3]); | |
83d2b9ba JR |
414 | } |
415 | ||
3fdbd1ce AA |
416 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, |
417 | __be32 addr[4], const __be32 new_addr[4], | |
418 | bool recalculate_csum) | |
419 | { | |
420 | if (recalculate_csum) | |
421 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); | |
422 | ||
7539fadc | 423 | skb_clear_hash(skb); |
a4c41688 | 424 | ovs_ct_clear(skb, NULL); |
3fdbd1ce AA |
425 | memcpy(addr, new_addr, sizeof(__be32[4])); |
426 | } | |
427 | ||
73447367 | 428 | static void set_ipv6_dsfield(struct sk_buff *skb, struct ipv6hdr *nh, u8 ipv6_tclass, u8 mask) |
3fdbd1ce | 429 | { |
73447367 PB |
430 | u8 old_ipv6_tclass = ipv6_get_dsfield(nh); |
431 | ||
432 | ipv6_tclass = OVS_MASKED(old_ipv6_tclass, ipv6_tclass, mask); | |
433 | ||
434 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
435 | csum_replace(&skb->csum, (__force __wsum)(old_ipv6_tclass << 12), | |
436 | (__force __wsum)(ipv6_tclass << 12)); | |
437 | ||
438 | ipv6_change_dsfield(nh, ~mask, ipv6_tclass); | |
439 | } | |
440 | ||
441 | static void set_ipv6_fl(struct sk_buff *skb, struct ipv6hdr *nh, u32 fl, u32 mask) | |
442 | { | |
443 | u32 ofl; | |
444 | ||
445 | ofl = nh->flow_lbl[0] << 16 | nh->flow_lbl[1] << 8 | nh->flow_lbl[2]; | |
446 | fl = OVS_MASKED(ofl, fl, mask); | |
447 | ||
83d2b9ba | 448 | /* Bits 21-24 are always unmasked, so this retains their values. */ |
73447367 PB |
449 | nh->flow_lbl[0] = (u8)(fl >> 16); |
450 | nh->flow_lbl[1] = (u8)(fl >> 8); | |
451 | nh->flow_lbl[2] = (u8)fl; | |
452 | ||
453 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
454 | csum_replace(&skb->csum, (__force __wsum)htonl(ofl), (__force __wsum)htonl(fl)); | |
455 | } | |
456 | ||
457 | static void set_ipv6_ttl(struct sk_buff *skb, struct ipv6hdr *nh, u8 new_ttl, u8 mask) | |
458 | { | |
459 | new_ttl = OVS_MASKED(nh->hop_limit, new_ttl, mask); | |
460 | ||
461 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
462 | csum_replace(&skb->csum, (__force __wsum)(nh->hop_limit << 8), | |
463 | (__force __wsum)(new_ttl << 8)); | |
464 | nh->hop_limit = new_ttl; | |
3fdbd1ce AA |
465 | } |
466 | ||
83d2b9ba JR |
467 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl, |
468 | u8 mask) | |
3fdbd1ce | 469 | { |
be26b9a8 | 470 | new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask); |
3fdbd1ce | 471 | |
ccb1352e JG |
472 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); |
473 | nh->ttl = new_ttl; | |
474 | } | |
475 | ||
83d2b9ba JR |
476 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key, |
477 | const struct ovs_key_ipv4 *key, | |
478 | const struct ovs_key_ipv4 *mask) | |
ccb1352e JG |
479 | { |
480 | struct iphdr *nh; | |
83d2b9ba | 481 | __be32 new_addr; |
ccb1352e JG |
482 | int err; |
483 | ||
e2195121 JP |
484 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
485 | sizeof(struct iphdr)); | |
ccb1352e JG |
486 | if (unlikely(err)) |
487 | return err; | |
488 | ||
489 | nh = ip_hdr(skb); | |
490 | ||
83d2b9ba JR |
491 | /* Setting an IP addresses is typically only a side effect of |
492 | * matching on them in the current userspace implementation, so it | |
493 | * makes sense to check if the value actually changed. | |
494 | */ | |
495 | if (mask->ipv4_src) { | |
be26b9a8 | 496 | new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src); |
ccb1352e | 497 | |
83d2b9ba JR |
498 | if (unlikely(new_addr != nh->saddr)) { |
499 | set_ip_addr(skb, nh, &nh->saddr, new_addr); | |
500 | flow_key->ipv4.addr.src = new_addr; | |
501 | } | |
fff06c36 | 502 | } |
83d2b9ba | 503 | if (mask->ipv4_dst) { |
be26b9a8 | 504 | new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst); |
ccb1352e | 505 | |
83d2b9ba JR |
506 | if (unlikely(new_addr != nh->daddr)) { |
507 | set_ip_addr(skb, nh, &nh->daddr, new_addr); | |
508 | flow_key->ipv4.addr.dst = new_addr; | |
509 | } | |
fff06c36 | 510 | } |
83d2b9ba JR |
511 | if (mask->ipv4_tos) { |
512 | ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos); | |
513 | flow_key->ip.tos = nh->tos; | |
514 | } | |
515 | if (mask->ipv4_ttl) { | |
516 | set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl); | |
517 | flow_key->ip.ttl = nh->ttl; | |
fff06c36 | 518 | } |
ccb1352e JG |
519 | |
520 | return 0; | |
521 | } | |
522 | ||
83d2b9ba JR |
523 | static bool is_ipv6_mask_nonzero(const __be32 addr[4]) |
524 | { | |
525 | return !!(addr[0] | addr[1] | addr[2] | addr[3]); | |
526 | } | |
527 | ||
528 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
529 | const struct ovs_key_ipv6 *key, | |
530 | const struct ovs_key_ipv6 *mask) | |
3fdbd1ce AA |
531 | { |
532 | struct ipv6hdr *nh; | |
533 | int err; | |
3fdbd1ce | 534 | |
e2195121 JP |
535 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
536 | sizeof(struct ipv6hdr)); | |
3fdbd1ce AA |
537 | if (unlikely(err)) |
538 | return err; | |
539 | ||
540 | nh = ipv6_hdr(skb); | |
3fdbd1ce | 541 | |
83d2b9ba JR |
542 | /* Setting an IP addresses is typically only a side effect of |
543 | * matching on them in the current userspace implementation, so it | |
544 | * makes sense to check if the value actually changed. | |
545 | */ | |
546 | if (is_ipv6_mask_nonzero(mask->ipv6_src)) { | |
547 | __be32 *saddr = (__be32 *)&nh->saddr; | |
548 | __be32 masked[4]; | |
549 | ||
550 | mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked); | |
551 | ||
552 | if (unlikely(memcmp(saddr, masked, sizeof(masked)))) { | |
b4f70527 | 553 | set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked, |
83d2b9ba JR |
554 | true); |
555 | memcpy(&flow_key->ipv6.addr.src, masked, | |
556 | sizeof(flow_key->ipv6.addr.src)); | |
557 | } | |
558 | } | |
559 | if (is_ipv6_mask_nonzero(mask->ipv6_dst)) { | |
3fdbd1ce AA |
560 | unsigned int offset = 0; |
561 | int flags = IP6_FH_F_SKIP_RH; | |
562 | bool recalc_csum = true; | |
83d2b9ba JR |
563 | __be32 *daddr = (__be32 *)&nh->daddr; |
564 | __be32 masked[4]; | |
565 | ||
566 | mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked); | |
567 | ||
568 | if (unlikely(memcmp(daddr, masked, sizeof(masked)))) { | |
569 | if (ipv6_ext_hdr(nh->nexthdr)) | |
570 | recalc_csum = (ipv6_find_hdr(skb, &offset, | |
571 | NEXTHDR_ROUTING, | |
572 | NULL, &flags) | |
573 | != NEXTHDR_ROUTING); | |
574 | ||
b4f70527 | 575 | set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked, |
83d2b9ba JR |
576 | recalc_csum); |
577 | memcpy(&flow_key->ipv6.addr.dst, masked, | |
578 | sizeof(flow_key->ipv6.addr.dst)); | |
579 | } | |
580 | } | |
581 | if (mask->ipv6_tclass) { | |
73447367 | 582 | set_ipv6_dsfield(skb, nh, key->ipv6_tclass, mask->ipv6_tclass); |
83d2b9ba JR |
583 | flow_key->ip.tos = ipv6_get_dsfield(nh); |
584 | } | |
585 | if (mask->ipv6_label) { | |
73447367 | 586 | set_ipv6_fl(skb, nh, ntohl(key->ipv6_label), |
83d2b9ba JR |
587 | ntohl(mask->ipv6_label)); |
588 | flow_key->ipv6.label = | |
589 | *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
590 | } | |
591 | if (mask->ipv6_hlimit) { | |
73447367 | 592 | set_ipv6_ttl(skb, nh, key->ipv6_hlimit, mask->ipv6_hlimit); |
83d2b9ba | 593 | flow_key->ip.ttl = nh->hop_limit; |
3fdbd1ce | 594 | } |
3fdbd1ce AA |
595 | return 0; |
596 | } | |
597 | ||
b2d0f5d5 YY |
598 | static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key, |
599 | const struct nlattr *a) | |
600 | { | |
601 | struct nshhdr *nh; | |
602 | size_t length; | |
603 | int err; | |
604 | u8 flags; | |
605 | u8 ttl; | |
606 | int i; | |
607 | ||
608 | struct ovs_key_nsh key; | |
609 | struct ovs_key_nsh mask; | |
610 | ||
611 | err = nsh_key_from_nlattr(a, &key, &mask); | |
612 | if (err) | |
613 | return err; | |
614 | ||
615 | /* Make sure the NSH base header is there */ | |
616 | if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN)) | |
617 | return -ENOMEM; | |
618 | ||
619 | nh = nsh_hdr(skb); | |
620 | length = nsh_hdr_len(nh); | |
621 | ||
622 | /* Make sure the whole NSH header is there */ | |
623 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
624 | length); | |
625 | if (unlikely(err)) | |
626 | return err; | |
627 | ||
628 | nh = nsh_hdr(skb); | |
629 | skb_postpull_rcsum(skb, nh, length); | |
630 | flags = nsh_get_flags(nh); | |
631 | flags = OVS_MASKED(flags, key.base.flags, mask.base.flags); | |
632 | flow_key->nsh.base.flags = flags; | |
633 | ttl = nsh_get_ttl(nh); | |
634 | ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl); | |
635 | flow_key->nsh.base.ttl = ttl; | |
636 | nsh_set_flags_and_ttl(nh, flags, ttl); | |
637 | nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr, | |
638 | mask.base.path_hdr); | |
639 | flow_key->nsh.base.path_hdr = nh->path_hdr; | |
640 | switch (nh->mdtype) { | |
641 | case NSH_M_TYPE1: | |
642 | for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) { | |
643 | nh->md1.context[i] = | |
644 | OVS_MASKED(nh->md1.context[i], key.context[i], | |
645 | mask.context[i]); | |
646 | } | |
647 | memcpy(flow_key->nsh.context, nh->md1.context, | |
648 | sizeof(nh->md1.context)); | |
649 | break; | |
650 | case NSH_M_TYPE2: | |
651 | memset(flow_key->nsh.context, 0, | |
652 | sizeof(flow_key->nsh.context)); | |
653 | break; | |
654 | default: | |
655 | return -EINVAL; | |
656 | } | |
657 | skb_postpush_rcsum(skb, nh, length); | |
658 | return 0; | |
659 | } | |
660 | ||
e2195121 | 661 | /* Must follow skb_ensure_writable() since that can move the skb data. */ |
ccb1352e | 662 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
83d2b9ba | 663 | __be16 new_port, __sum16 *check) |
ccb1352e | 664 | { |
a4c41688 | 665 | ovs_ct_clear(skb, NULL); |
4b048d6d | 666 | inet_proto_csum_replace2(check, skb, *port, new_port, false); |
ccb1352e | 667 | *port = new_port; |
81e5d41d JG |
668 | } |
669 | ||
83d2b9ba JR |
670 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
671 | const struct ovs_key_udp *key, | |
672 | const struct ovs_key_udp *mask) | |
ccb1352e JG |
673 | { |
674 | struct udphdr *uh; | |
83d2b9ba | 675 | __be16 src, dst; |
ccb1352e JG |
676 | int err; |
677 | ||
e2195121 JP |
678 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
679 | sizeof(struct udphdr)); | |
ccb1352e JG |
680 | if (unlikely(err)) |
681 | return err; | |
682 | ||
683 | uh = udp_hdr(skb); | |
83d2b9ba | 684 | /* Either of the masks is non-zero, so do not bother checking them. */ |
be26b9a8 JS |
685 | src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src); |
686 | dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst); | |
ccb1352e | 687 | |
83d2b9ba JR |
688 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
689 | if (likely(src != uh->source)) { | |
690 | set_tp_port(skb, &uh->source, src, &uh->check); | |
691 | flow_key->tp.src = src; | |
692 | } | |
693 | if (likely(dst != uh->dest)) { | |
694 | set_tp_port(skb, &uh->dest, dst, &uh->check); | |
695 | flow_key->tp.dst = dst; | |
696 | } | |
697 | ||
698 | if (unlikely(!uh->check)) | |
699 | uh->check = CSUM_MANGLED_0; | |
700 | } else { | |
701 | uh->source = src; | |
702 | uh->dest = dst; | |
703 | flow_key->tp.src = src; | |
704 | flow_key->tp.dst = dst; | |
a4c41688 | 705 | ovs_ct_clear(skb, NULL); |
fff06c36 | 706 | } |
ccb1352e | 707 | |
83d2b9ba JR |
708 | skb_clear_hash(skb); |
709 | ||
ccb1352e JG |
710 | return 0; |
711 | } | |
712 | ||
83d2b9ba JR |
713 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
714 | const struct ovs_key_tcp *key, | |
715 | const struct ovs_key_tcp *mask) | |
ccb1352e JG |
716 | { |
717 | struct tcphdr *th; | |
83d2b9ba | 718 | __be16 src, dst; |
ccb1352e JG |
719 | int err; |
720 | ||
e2195121 JP |
721 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
722 | sizeof(struct tcphdr)); | |
ccb1352e JG |
723 | if (unlikely(err)) |
724 | return err; | |
725 | ||
726 | th = tcp_hdr(skb); | |
be26b9a8 | 727 | src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src); |
83d2b9ba JR |
728 | if (likely(src != th->source)) { |
729 | set_tp_port(skb, &th->source, src, &th->check); | |
730 | flow_key->tp.src = src; | |
fff06c36 | 731 | } |
be26b9a8 | 732 | dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst); |
83d2b9ba JR |
733 | if (likely(dst != th->dest)) { |
734 | set_tp_port(skb, &th->dest, dst, &th->check); | |
735 | flow_key->tp.dst = dst; | |
fff06c36 | 736 | } |
83d2b9ba | 737 | skb_clear_hash(skb); |
ccb1352e JG |
738 | |
739 | return 0; | |
740 | } | |
741 | ||
83d2b9ba JR |
742 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
743 | const struct ovs_key_sctp *key, | |
744 | const struct ovs_key_sctp *mask) | |
a175a723 | 745 | { |
83d2b9ba | 746 | unsigned int sctphoff = skb_transport_offset(skb); |
a175a723 | 747 | struct sctphdr *sh; |
83d2b9ba | 748 | __le32 old_correct_csum, new_csum, old_csum; |
a175a723 | 749 | int err; |
a175a723 | 750 | |
e2195121 | 751 | err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr)); |
a175a723 JS |
752 | if (unlikely(err)) |
753 | return err; | |
754 | ||
755 | sh = sctp_hdr(skb); | |
83d2b9ba JR |
756 | old_csum = sh->checksum; |
757 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
a175a723 | 758 | |
be26b9a8 JS |
759 | sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src); |
760 | sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst); | |
a175a723 | 761 | |
83d2b9ba | 762 | new_csum = sctp_compute_cksum(skb, sctphoff); |
a175a723 | 763 | |
83d2b9ba JR |
764 | /* Carry any checksum errors through. */ |
765 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
a175a723 | 766 | |
83d2b9ba | 767 | skb_clear_hash(skb); |
a4c41688 IM |
768 | ovs_ct_clear(skb, NULL); |
769 | ||
83d2b9ba JR |
770 | flow_key->tp.src = sh->source; |
771 | flow_key->tp.dst = sh->dest; | |
a175a723 JS |
772 | |
773 | return 0; | |
774 | } | |
775 | ||
cf3266ad TZ |
776 | static int ovs_vport_output(struct net *net, struct sock *sk, |
777 | struct sk_buff *skb) | |
7f8a436e JS |
778 | { |
779 | struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage); | |
780 | struct vport *vport = data->vport; | |
781 | ||
782 | if (skb_cow_head(skb, data->l2_len) < 0) { | |
783 | kfree_skb(skb); | |
784 | return -ENOMEM; | |
785 | } | |
786 | ||
787 | __skb_dst_copy(skb, data->dst); | |
788 | *OVS_CB(skb) = data->cb; | |
789 | skb->inner_protocol = data->inner_protocol; | |
9df46aef MM |
790 | if (data->vlan_tci & VLAN_CFI_MASK) |
791 | __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK); | |
792 | else | |
793 | __vlan_hwaccel_clear_tag(skb); | |
7f8a436e JS |
794 | |
795 | /* Reconstruct the MAC header. */ | |
796 | skb_push(skb, data->l2_len); | |
797 | memcpy(skb->data, &data->l2_data, data->l2_len); | |
6b83d28a | 798 | skb_postpush_rcsum(skb, skb->data, data->l2_len); |
7f8a436e JS |
799 | skb_reset_mac_header(skb); |
800 | ||
c66549ff JB |
801 | if (eth_p_mpls(skb->protocol)) { |
802 | skb->inner_network_header = skb->network_header; | |
803 | skb_set_network_header(skb, data->network_offset); | |
804 | skb_reset_mac_len(skb); | |
805 | } | |
806 | ||
e2d9d835 | 807 | ovs_vport_send(vport, skb, data->mac_proto); |
7f8a436e JS |
808 | return 0; |
809 | } | |
810 | ||
811 | static unsigned int | |
812 | ovs_dst_get_mtu(const struct dst_entry *dst) | |
813 | { | |
814 | return dst->dev->mtu; | |
815 | } | |
816 | ||
817 | static struct dst_ops ovs_dst_ops = { | |
818 | .family = AF_UNSPEC, | |
819 | .mtu = ovs_dst_get_mtu, | |
820 | }; | |
821 | ||
822 | /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is | |
823 | * ovs_vport_output(), which is called once per fragmented packet. | |
824 | */ | |
c66549ff | 825 | static void prepare_frag(struct vport *vport, struct sk_buff *skb, |
e2d9d835 | 826 | u16 orig_network_offset, u8 mac_proto) |
7f8a436e JS |
827 | { |
828 | unsigned int hlen = skb_network_offset(skb); | |
829 | struct ovs_frag_data *data; | |
830 | ||
831 | data = this_cpu_ptr(&ovs_frag_data_storage); | |
832 | data->dst = skb->_skb_refdst; | |
833 | data->vport = vport; | |
834 | data->cb = *OVS_CB(skb); | |
835 | data->inner_protocol = skb->inner_protocol; | |
c66549ff | 836 | data->network_offset = orig_network_offset; |
9df46aef MM |
837 | if (skb_vlan_tag_present(skb)) |
838 | data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK; | |
839 | else | |
840 | data->vlan_tci = 0; | |
7f8a436e | 841 | data->vlan_proto = skb->vlan_proto; |
e2d9d835 | 842 | data->mac_proto = mac_proto; |
7f8a436e JS |
843 | data->l2_len = hlen; |
844 | memcpy(&data->l2_data, skb->data, hlen); | |
845 | ||
846 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
847 | skb_pull(skb, hlen); | |
848 | } | |
849 | ||
c559cd3a | 850 | static void ovs_fragment(struct net *net, struct vport *vport, |
e2d9d835 JB |
851 | struct sk_buff *skb, u16 mru, |
852 | struct sw_flow_key *key) | |
7f8a436e | 853 | { |
c66549ff JB |
854 | u16 orig_network_offset = 0; |
855 | ||
856 | if (eth_p_mpls(skb->protocol)) { | |
857 | orig_network_offset = skb_network_offset(skb); | |
858 | skb->network_header = skb->inner_network_header; | |
859 | } | |
860 | ||
7f8a436e JS |
861 | if (skb_network_offset(skb) > MAX_L2_LEN) { |
862 | OVS_NLERR(1, "L2 header too long to fragment"); | |
b8f22570 | 863 | goto err; |
7f8a436e JS |
864 | } |
865 | ||
e2d9d835 | 866 | if (key->eth.type == htons(ETH_P_IP)) { |
7c0ea593 | 867 | struct rtable ovs_rt = { 0 }; |
7f8a436e JS |
868 | unsigned long orig_dst; |
869 | ||
e2d9d835 JB |
870 | prepare_frag(vport, skb, orig_network_offset, |
871 | ovs_key_mac_proto(key)); | |
7c0ea593 | 872 | dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1, |
7f8a436e | 873 | DST_OBSOLETE_NONE, DST_NOCOUNT); |
7c0ea593 | 874 | ovs_rt.dst.dev = vport->dev; |
7f8a436e JS |
875 | |
876 | orig_dst = skb->_skb_refdst; | |
7c0ea593 | 877 | skb_dst_set_noref(skb, &ovs_rt.dst); |
7f8a436e JS |
878 | IPCB(skb)->frag_max_size = mru; |
879 | ||
694869b3 | 880 | ip_do_fragment(net, skb->sk, skb, ovs_vport_output); |
7f8a436e | 881 | refdst_drop(orig_dst); |
e2d9d835 | 882 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
7f8a436e JS |
883 | unsigned long orig_dst; |
884 | struct rt6_info ovs_rt; | |
885 | ||
e2d9d835 JB |
886 | prepare_frag(vport, skb, orig_network_offset, |
887 | ovs_key_mac_proto(key)); | |
7f8a436e JS |
888 | memset(&ovs_rt, 0, sizeof(ovs_rt)); |
889 | dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1, | |
890 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
891 | ovs_rt.dst.dev = vport->dev; | |
892 | ||
893 | orig_dst = skb->_skb_refdst; | |
894 | skb_dst_set_noref(skb, &ovs_rt.dst); | |
895 | IP6CB(skb)->frag_max_size = mru; | |
896 | ||
a7c978c6 | 897 | ipv6_stub->ipv6_fragment(net, skb->sk, skb, ovs_vport_output); |
7f8a436e JS |
898 | refdst_drop(orig_dst); |
899 | } else { | |
900 | WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.", | |
e2d9d835 | 901 | ovs_vport_name(vport), ntohs(key->eth.type), mru, |
7f8a436e | 902 | vport->dev->mtu); |
b8f22570 | 903 | goto err; |
7f8a436e | 904 | } |
b8f22570 JS |
905 | |
906 | return; | |
907 | err: | |
908 | kfree_skb(skb); | |
7f8a436e JS |
909 | } |
910 | ||
911 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port, | |
912 | struct sw_flow_key *key) | |
ccb1352e | 913 | { |
738967b8 | 914 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
ccb1352e | 915 | |
7f8a436e JS |
916 | if (likely(vport)) { |
917 | u16 mru = OVS_CB(skb)->mru; | |
f2a4d086 WT |
918 | u32 cutlen = OVS_CB(skb)->cutlen; |
919 | ||
920 | if (unlikely(cutlen > 0)) { | |
e2d9d835 | 921 | if (skb->len - cutlen > ovs_mac_header_len(key)) |
f2a4d086 WT |
922 | pskb_trim(skb, skb->len - cutlen); |
923 | else | |
e2d9d835 | 924 | pskb_trim(skb, ovs_mac_header_len(key)); |
f2a4d086 | 925 | } |
7f8a436e | 926 | |
738314a0 JB |
927 | if (likely(!mru || |
928 | (skb->len <= mru + vport->dev->hard_header_len))) { | |
e2d9d835 | 929 | ovs_vport_send(vport, skb, ovs_key_mac_proto(key)); |
7f8a436e | 930 | } else if (mru <= vport->dev->mtu) { |
c559cd3a | 931 | struct net *net = read_pnet(&dp->net); |
7f8a436e | 932 | |
e2d9d835 | 933 | ovs_fragment(net, vport, skb, mru, key); |
7f8a436e JS |
934 | } else { |
935 | kfree_skb(skb); | |
936 | } | |
937 | } else { | |
ccb1352e | 938 | kfree_skb(skb); |
7f8a436e | 939 | } |
ccb1352e JG |
940 | } |
941 | ||
942 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, | |
ccea7445 | 943 | struct sw_flow_key *key, const struct nlattr *attr, |
f2a4d086 WT |
944 | const struct nlattr *actions, int actions_len, |
945 | uint32_t cutlen) | |
ccb1352e JG |
946 | { |
947 | struct dp_upcall_info upcall; | |
948 | const struct nlattr *a; | |
949 | int rem; | |
950 | ||
ccea7445 | 951 | memset(&upcall, 0, sizeof(upcall)); |
ccb1352e | 952 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
7f8a436e | 953 | upcall.mru = OVS_CB(skb)->mru; |
ccb1352e JG |
954 | |
955 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
cf3266ad | 956 | a = nla_next(a, &rem)) { |
ccb1352e JG |
957 | switch (nla_type(a)) { |
958 | case OVS_USERSPACE_ATTR_USERDATA: | |
959 | upcall.userdata = a; | |
960 | break; | |
961 | ||
962 | case OVS_USERSPACE_ATTR_PID: | |
784dcfa5 MG |
963 | if (dp->user_features & |
964 | OVS_DP_F_DISPATCH_UPCALL_PER_CPU) | |
b83d23a2 | 965 | upcall.portid = |
784dcfa5 MG |
966 | ovs_dp_get_upcall_portid(dp, |
967 | smp_processor_id()); | |
b83d23a2 MG |
968 | else |
969 | upcall.portid = nla_get_u32(a); | |
ccb1352e | 970 | break; |
8f0aad6f WZ |
971 | |
972 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
973 | /* Get out tunnel info. */ | |
974 | struct vport *vport; | |
975 | ||
976 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
977 | if (vport) { | |
978 | int err; | |
979 | ||
fc4099f1 PS |
980 | err = dev_fill_metadata_dst(vport->dev, skb); |
981 | if (!err) | |
982 | upcall.egress_tun_info = skb_tunnel_info(skb); | |
8f0aad6f | 983 | } |
4c222798 | 984 | |
8f0aad6f | 985 | break; |
ccb1352e | 986 | } |
8f0aad6f | 987 | |
ccea7445 NM |
988 | case OVS_USERSPACE_ATTR_ACTIONS: { |
989 | /* Include actions. */ | |
990 | upcall.actions = actions; | |
991 | upcall.actions_len = actions_len; | |
992 | break; | |
993 | } | |
994 | ||
8f0aad6f | 995 | } /* End of switch. */ |
ccb1352e JG |
996 | } |
997 | ||
f2a4d086 | 998 | return ovs_dp_upcall(dp, skb, key, &upcall, cutlen); |
ccb1352e JG |
999 | } |
1000 | ||
744676e7 MC |
1001 | static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb, |
1002 | struct sw_flow_key *key, | |
a5317f3b | 1003 | const struct nlattr *attr) |
744676e7 | 1004 | { |
09d62172 EC |
1005 | /* The first attribute is always 'OVS_DEC_TTL_ATTR_ACTION'. */ |
1006 | struct nlattr *actions = nla_data(attr); | |
744676e7 | 1007 | |
09d62172 EC |
1008 | if (nla_len(actions)) |
1009 | return clone_execute(dp, skb, key, 0, nla_data(actions), | |
a5317f3b | 1010 | nla_len(actions), true, false); |
744676e7 | 1011 | |
744676e7 MC |
1012 | consume_skb(skb); |
1013 | return 0; | |
1014 | } | |
1015 | ||
798c1661 | 1016 | /* When 'last' is true, sample() should always consume the 'skb'. |
1017 | * Otherwise, sample() should keep 'skb' intact regardless what | |
1018 | * actions are executed within sample(). | |
1019 | */ | |
ccb1352e | 1020 | static int sample(struct datapath *dp, struct sk_buff *skb, |
ccea7445 | 1021 | struct sw_flow_key *key, const struct nlattr *attr, |
798c1661 | 1022 | bool last) |
ccb1352e | 1023 | { |
798c1661 | 1024 | struct nlattr *actions; |
1025 | struct nlattr *sample_arg; | |
798c1661 | 1026 | int rem = nla_len(attr); |
798c1661 | 1027 | const struct sample_arg *arg; |
bef7f756 | 1028 | bool clone_flow_key; |
ccb1352e | 1029 | |
798c1661 | 1030 | /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */ |
1031 | sample_arg = nla_data(attr); | |
1032 | arg = nla_data(sample_arg); | |
1033 | actions = nla_next(sample_arg, &rem); | |
e05176a3 | 1034 | |
798c1661 | 1035 | if ((arg->probability != U32_MAX) && |
1036 | (!arg->probability || prandom_u32() > arg->probability)) { | |
1037 | if (last) | |
1038 | consume_skb(skb); | |
1039 | return 0; | |
ccb1352e JG |
1040 | } |
1041 | ||
bef7f756 | 1042 | clone_flow_key = !arg->exec; |
1043 | return clone_execute(dp, skb, key, 0, actions, rem, last, | |
1044 | clone_flow_key); | |
971427f3 AZ |
1045 | } |
1046 | ||
b2335040 YS |
1047 | /* When 'last' is true, clone() should always consume the 'skb'. |
1048 | * Otherwise, clone() should keep 'skb' intact regardless what | |
1049 | * actions are executed within clone(). | |
1050 | */ | |
1051 | static int clone(struct datapath *dp, struct sk_buff *skb, | |
1052 | struct sw_flow_key *key, const struct nlattr *attr, | |
1053 | bool last) | |
1054 | { | |
1055 | struct nlattr *actions; | |
1056 | struct nlattr *clone_arg; | |
1057 | int rem = nla_len(attr); | |
1058 | bool dont_clone_flow_key; | |
1059 | ||
2386e27f | 1060 | /* The first action is always 'OVS_CLONE_ATTR_EXEC'. */ |
b2335040 YS |
1061 | clone_arg = nla_data(attr); |
1062 | dont_clone_flow_key = nla_get_u32(clone_arg); | |
1063 | actions = nla_next(clone_arg, &rem); | |
1064 | ||
1065 | return clone_execute(dp, skb, key, 0, actions, rem, last, | |
1066 | !dont_clone_flow_key); | |
1067 | } | |
1068 | ||
971427f3 AZ |
1069 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, |
1070 | const struct nlattr *attr) | |
1071 | { | |
1072 | struct ovs_action_hash *hash_act = nla_data(attr); | |
1073 | u32 hash = 0; | |
1074 | ||
1075 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
1076 | hash = skb_get_hash(skb); | |
1077 | hash = jhash_1word(hash, hash_act->hash_basis); | |
1078 | if (!hash) | |
1079 | hash = 0x1; | |
1080 | ||
1081 | key->ovs_flow_hash = hash; | |
ccb1352e JG |
1082 | } |
1083 | ||
83d2b9ba JR |
1084 | static int execute_set_action(struct sk_buff *skb, |
1085 | struct sw_flow_key *flow_key, | |
1086 | const struct nlattr *a) | |
1087 | { | |
1088 | /* Only tunnel set execution is supported without a mask. */ | |
1089 | if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) { | |
34ae932a TG |
1090 | struct ovs_tunnel_info *tun = nla_data(a); |
1091 | ||
1092 | skb_dst_drop(skb); | |
1093 | dst_hold((struct dst_entry *)tun->tun_dst); | |
1094 | skb_dst_set(skb, (struct dst_entry *)tun->tun_dst); | |
83d2b9ba JR |
1095 | return 0; |
1096 | } | |
1097 | ||
1098 | return -EINVAL; | |
1099 | } | |
1100 | ||
1101 | /* Mask is at the midpoint of the data. */ | |
1102 | #define get_mask(a, type) ((const type)nla_data(a) + 1) | |
1103 | ||
1104 | static int execute_masked_set_action(struct sk_buff *skb, | |
1105 | struct sw_flow_key *flow_key, | |
1106 | const struct nlattr *a) | |
ccb1352e JG |
1107 | { |
1108 | int err = 0; | |
1109 | ||
83d2b9ba | 1110 | switch (nla_type(a)) { |
ccb1352e | 1111 | case OVS_KEY_ATTR_PRIORITY: |
be26b9a8 JS |
1112 | OVS_SET_MASKED(skb->priority, nla_get_u32(a), |
1113 | *get_mask(a, u32 *)); | |
83d2b9ba | 1114 | flow_key->phy.priority = skb->priority; |
ccb1352e JG |
1115 | break; |
1116 | ||
39c7caeb | 1117 | case OVS_KEY_ATTR_SKB_MARK: |
be26b9a8 | 1118 | OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *)); |
83d2b9ba | 1119 | flow_key->phy.skb_mark = skb->mark; |
39c7caeb AA |
1120 | break; |
1121 | ||
f0b128c1 | 1122 | case OVS_KEY_ATTR_TUNNEL_INFO: |
83d2b9ba JR |
1123 | /* Masked data not supported for tunnel. */ |
1124 | err = -EINVAL; | |
7d5437c7 PS |
1125 | break; |
1126 | ||
ccb1352e | 1127 | case OVS_KEY_ATTR_ETHERNET: |
83d2b9ba JR |
1128 | err = set_eth_addr(skb, flow_key, nla_data(a), |
1129 | get_mask(a, struct ovs_key_ethernet *)); | |
ccb1352e JG |
1130 | break; |
1131 | ||
b2d0f5d5 YY |
1132 | case OVS_KEY_ATTR_NSH: |
1133 | err = set_nsh(skb, flow_key, a); | |
1134 | break; | |
1135 | ||
ccb1352e | 1136 | case OVS_KEY_ATTR_IPV4: |
83d2b9ba JR |
1137 | err = set_ipv4(skb, flow_key, nla_data(a), |
1138 | get_mask(a, struct ovs_key_ipv4 *)); | |
ccb1352e JG |
1139 | break; |
1140 | ||
3fdbd1ce | 1141 | case OVS_KEY_ATTR_IPV6: |
83d2b9ba JR |
1142 | err = set_ipv6(skb, flow_key, nla_data(a), |
1143 | get_mask(a, struct ovs_key_ipv6 *)); | |
3fdbd1ce AA |
1144 | break; |
1145 | ||
ccb1352e | 1146 | case OVS_KEY_ATTR_TCP: |
83d2b9ba JR |
1147 | err = set_tcp(skb, flow_key, nla_data(a), |
1148 | get_mask(a, struct ovs_key_tcp *)); | |
ccb1352e JG |
1149 | break; |
1150 | ||
1151 | case OVS_KEY_ATTR_UDP: | |
83d2b9ba JR |
1152 | err = set_udp(skb, flow_key, nla_data(a), |
1153 | get_mask(a, struct ovs_key_udp *)); | |
ccb1352e | 1154 | break; |
a175a723 JS |
1155 | |
1156 | case OVS_KEY_ATTR_SCTP: | |
83d2b9ba JR |
1157 | err = set_sctp(skb, flow_key, nla_data(a), |
1158 | get_mask(a, struct ovs_key_sctp *)); | |
a175a723 | 1159 | break; |
25cd9ba0 SH |
1160 | |
1161 | case OVS_KEY_ATTR_MPLS: | |
83d2b9ba JR |
1162 | err = set_mpls(skb, flow_key, nla_data(a), get_mask(a, |
1163 | __be32 *)); | |
25cd9ba0 | 1164 | break; |
7f8a436e JS |
1165 | |
1166 | case OVS_KEY_ATTR_CT_STATE: | |
1167 | case OVS_KEY_ATTR_CT_ZONE: | |
182e3042 | 1168 | case OVS_KEY_ATTR_CT_MARK: |
33db4125 | 1169 | case OVS_KEY_ATTR_CT_LABELS: |
9dd7f890 JR |
1170 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4: |
1171 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6: | |
7f8a436e JS |
1172 | err = -EINVAL; |
1173 | break; | |
ccb1352e JG |
1174 | } |
1175 | ||
1176 | return err; | |
1177 | } | |
1178 | ||
971427f3 AZ |
1179 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
1180 | struct sw_flow_key *key, | |
bef7f756 | 1181 | const struct nlattr *a, bool last) |
971427f3 | 1182 | { |
bef7f756 | 1183 | u32 recirc_id; |
971427f3 | 1184 | |
fff06c36 PS |
1185 | if (!is_flow_key_valid(key)) { |
1186 | int err; | |
1187 | ||
1188 | err = ovs_flow_key_update(skb, key); | |
1189 | if (err) | |
1190 | return err; | |
1191 | } | |
1192 | BUG_ON(!is_flow_key_valid(key)); | |
971427f3 | 1193 | |
bef7f756 | 1194 | recirc_id = nla_get_u32(a); |
1195 | return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true); | |
971427f3 AZ |
1196 | } |
1197 | ||
4d5ec89f NS |
1198 | static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb, |
1199 | struct sw_flow_key *key, | |
1200 | const struct nlattr *attr, bool last) | |
1201 | { | |
17843655 | 1202 | struct ovs_skb_cb *ovs_cb = OVS_CB(skb); |
4d5ec89f | 1203 | const struct nlattr *actions, *cpl_arg; |
17843655 | 1204 | int len, max_len, rem = nla_len(attr); |
4d5ec89f | 1205 | const struct check_pkt_len_arg *arg; |
4d5ec89f NS |
1206 | bool clone_flow_key; |
1207 | ||
1208 | /* The first netlink attribute in 'attr' is always | |
1209 | * 'OVS_CHECK_PKT_LEN_ATTR_ARG'. | |
1210 | */ | |
1211 | cpl_arg = nla_data(attr); | |
1212 | arg = nla_data(cpl_arg); | |
1213 | ||
17843655 LB |
1214 | len = ovs_cb->mru ? ovs_cb->mru + skb->mac_len : skb->len; |
1215 | max_len = arg->pkt_len; | |
1216 | ||
1217 | if ((skb_is_gso(skb) && skb_gso_validate_mac_len(skb, max_len)) || | |
1218 | len <= max_len) { | |
4d5ec89f NS |
1219 | /* Second netlink attribute in 'attr' is always |
1220 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'. | |
1221 | */ | |
1222 | actions = nla_next(cpl_arg, &rem); | |
1223 | clone_flow_key = !arg->exec_for_lesser_equal; | |
1224 | } else { | |
1225 | /* Third netlink attribute in 'attr' is always | |
1226 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'. | |
1227 | */ | |
1228 | actions = nla_next(cpl_arg, &rem); | |
1229 | actions = nla_next(actions, &rem); | |
1230 | clone_flow_key = !arg->exec_for_greater; | |
1231 | } | |
1232 | ||
1233 | return clone_execute(dp, skb, key, 0, nla_data(actions), | |
1234 | nla_len(actions), last, clone_flow_key); | |
1235 | } | |
1236 | ||
744676e7 MC |
1237 | static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key) |
1238 | { | |
1239 | int err; | |
1240 | ||
1241 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
1242 | struct ipv6hdr *nh; | |
1243 | ||
1244 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
1245 | sizeof(*nh)); | |
1246 | if (unlikely(err)) | |
1247 | return err; | |
1248 | ||
1249 | nh = ipv6_hdr(skb); | |
1250 | ||
1251 | if (nh->hop_limit <= 1) | |
1252 | return -EHOSTUNREACH; | |
1253 | ||
1254 | key->ip.ttl = --nh->hop_limit; | |
09d62172 | 1255 | } else if (skb->protocol == htons(ETH_P_IP)) { |
744676e7 MC |
1256 | struct iphdr *nh; |
1257 | u8 old_ttl; | |
1258 | ||
1259 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
1260 | sizeof(*nh)); | |
1261 | if (unlikely(err)) | |
1262 | return err; | |
1263 | ||
1264 | nh = ip_hdr(skb); | |
1265 | if (nh->ttl <= 1) | |
1266 | return -EHOSTUNREACH; | |
1267 | ||
1268 | old_ttl = nh->ttl--; | |
1269 | csum_replace2(&nh->check, htons(old_ttl << 8), | |
1270 | htons(nh->ttl << 8)); | |
1271 | key->ip.ttl = nh->ttl; | |
1272 | } | |
1273 | return 0; | |
1274 | } | |
1275 | ||
ccb1352e JG |
1276 | /* Execute a list of actions against 'skb'. */ |
1277 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 1278 | struct sw_flow_key *key, |
651887b0 | 1279 | const struct nlattr *attr, int len) |
ccb1352e | 1280 | { |
ccb1352e JG |
1281 | const struct nlattr *a; |
1282 | int rem; | |
1283 | ||
1284 | for (a = attr, rem = len; rem > 0; | |
1285 | a = nla_next(a, &rem)) { | |
1286 | int err = 0; | |
1287 | ||
c4ab7b56 AC |
1288 | if (trace_ovs_do_execute_action_enabled()) |
1289 | trace_ovs_do_execute_action(dp, skb, key, a, rem); | |
1290 | ||
5b8784aa | 1291 | switch (nla_type(a)) { |
1292 | case OVS_ACTION_ATTR_OUTPUT: { | |
1293 | int port = nla_get_u32(a); | |
1294 | struct sk_buff *clone; | |
1295 | ||
1296 | /* Every output action needs a separate clone | |
1297 | * of 'skb', In case the output action is the | |
1298 | * last action, cloning can be avoided. | |
1299 | */ | |
1300 | if (nla_is_last(a, rem)) { | |
1301 | do_output(dp, skb, port, key); | |
1302 | /* 'skb' has been used for output. | |
1303 | */ | |
1304 | return 0; | |
1305 | } | |
738967b8 | 1306 | |
5b8784aa | 1307 | clone = skb_clone(skb, GFP_ATOMIC); |
1308 | if (clone) | |
1309 | do_output(dp, clone, port, key); | |
f2a4d086 | 1310 | OVS_CB(skb)->cutlen = 0; |
ccb1352e | 1311 | break; |
5b8784aa | 1312 | } |
ccb1352e | 1313 | |
f2a4d086 WT |
1314 | case OVS_ACTION_ATTR_TRUNC: { |
1315 | struct ovs_action_trunc *trunc = nla_data(a); | |
1316 | ||
1317 | if (skb->len > trunc->max_len) | |
1318 | OVS_CB(skb)->cutlen = skb->len - trunc->max_len; | |
1319 | break; | |
1320 | } | |
1321 | ||
ccb1352e | 1322 | case OVS_ACTION_ATTR_USERSPACE: |
f2a4d086 WT |
1323 | output_userspace(dp, skb, key, a, attr, |
1324 | len, OVS_CB(skb)->cutlen); | |
1325 | OVS_CB(skb)->cutlen = 0; | |
ccb1352e JG |
1326 | break; |
1327 | ||
971427f3 AZ |
1328 | case OVS_ACTION_ATTR_HASH: |
1329 | execute_hash(skb, key, a); | |
1330 | break; | |
1331 | ||
f66b53fd MV |
1332 | case OVS_ACTION_ATTR_PUSH_MPLS: { |
1333 | struct ovs_action_push_mpls *mpls = nla_data(a); | |
1334 | ||
1335 | err = push_mpls(skb, key, mpls->mpls_lse, | |
1336 | mpls->mpls_ethertype, skb->mac_len); | |
25cd9ba0 | 1337 | break; |
f66b53fd MV |
1338 | } |
1339 | case OVS_ACTION_ATTR_ADD_MPLS: { | |
1340 | struct ovs_action_add_mpls *mpls = nla_data(a); | |
1341 | __u16 mac_len = 0; | |
1342 | ||
1343 | if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) | |
1344 | mac_len = skb->mac_len; | |
25cd9ba0 | 1345 | |
f66b53fd MV |
1346 | err = push_mpls(skb, key, mpls->mpls_lse, |
1347 | mpls->mpls_ethertype, mac_len); | |
1348 | break; | |
1349 | } | |
25cd9ba0 | 1350 | case OVS_ACTION_ATTR_POP_MPLS: |
fff06c36 | 1351 | err = pop_mpls(skb, key, nla_get_be16(a)); |
25cd9ba0 SH |
1352 | break; |
1353 | ||
ccb1352e | 1354 | case OVS_ACTION_ATTR_PUSH_VLAN: |
fff06c36 | 1355 | err = push_vlan(skb, key, nla_data(a)); |
ccb1352e JG |
1356 | break; |
1357 | ||
1358 | case OVS_ACTION_ATTR_POP_VLAN: | |
fff06c36 | 1359 | err = pop_vlan(skb, key); |
ccb1352e JG |
1360 | break; |
1361 | ||
bef7f756 | 1362 | case OVS_ACTION_ATTR_RECIRC: { |
1363 | bool last = nla_is_last(a, rem); | |
1364 | ||
1365 | err = execute_recirc(dp, skb, key, a, last); | |
1366 | if (last) { | |
971427f3 AZ |
1367 | /* If this is the last action, the skb has |
1368 | * been consumed or freed. | |
1369 | * Return immediately. | |
1370 | */ | |
1371 | return err; | |
1372 | } | |
1373 | break; | |
bef7f756 | 1374 | } |
971427f3 | 1375 | |
ccb1352e | 1376 | case OVS_ACTION_ATTR_SET: |
fff06c36 | 1377 | err = execute_set_action(skb, key, nla_data(a)); |
ccb1352e JG |
1378 | break; |
1379 | ||
83d2b9ba JR |
1380 | case OVS_ACTION_ATTR_SET_MASKED: |
1381 | case OVS_ACTION_ATTR_SET_TO_MASKED: | |
1382 | err = execute_masked_set_action(skb, key, nla_data(a)); | |
1383 | break; | |
1384 | ||
798c1661 | 1385 | case OVS_ACTION_ATTR_SAMPLE: { |
1386 | bool last = nla_is_last(a, rem); | |
1387 | ||
1388 | err = sample(dp, skb, key, a, last); | |
1389 | if (last) | |
1390 | return err; | |
1391 | ||
ccb1352e | 1392 | break; |
798c1661 | 1393 | } |
7f8a436e JS |
1394 | |
1395 | case OVS_ACTION_ATTR_CT: | |
ec0d043d JS |
1396 | if (!is_flow_key_valid(key)) { |
1397 | err = ovs_flow_key_update(skb, key); | |
1398 | if (err) | |
1399 | return err; | |
1400 | } | |
1401 | ||
7f8a436e JS |
1402 | err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key, |
1403 | nla_data(a)); | |
1404 | ||
1405 | /* Hide stolen IP fragments from user space. */ | |
74c16618 JS |
1406 | if (err) |
1407 | return err == -EINPROGRESS ? 0 : err; | |
7f8a436e | 1408 | break; |
91820da6 | 1409 | |
b8226962 EG |
1410 | case OVS_ACTION_ATTR_CT_CLEAR: |
1411 | err = ovs_ct_clear(skb, key); | |
1412 | break; | |
1413 | ||
91820da6 JB |
1414 | case OVS_ACTION_ATTR_PUSH_ETH: |
1415 | err = push_eth(skb, key, nla_data(a)); | |
1416 | break; | |
1417 | ||
1418 | case OVS_ACTION_ATTR_POP_ETH: | |
1419 | err = pop_eth(skb, key); | |
1420 | break; | |
b2d0f5d5 YY |
1421 | |
1422 | case OVS_ACTION_ATTR_PUSH_NSH: { | |
1423 | u8 buffer[NSH_HDR_MAX_LEN]; | |
1424 | struct nshhdr *nh = (struct nshhdr *)buffer; | |
1425 | ||
1426 | err = nsh_hdr_from_nlattr(nla_data(a), nh, | |
1427 | NSH_HDR_MAX_LEN); | |
1428 | if (unlikely(err)) | |
1429 | break; | |
1430 | err = push_nsh(skb, key, nh); | |
1431 | break; | |
1432 | } | |
1433 | ||
1434 | case OVS_ACTION_ATTR_POP_NSH: | |
1435 | err = pop_nsh(skb, key); | |
1436 | break; | |
cd8a6c33 AZ |
1437 | |
1438 | case OVS_ACTION_ATTR_METER: | |
1439 | if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) { | |
1440 | consume_skb(skb); | |
1441 | return 0; | |
1442 | } | |
b2335040 YS |
1443 | break; |
1444 | ||
1445 | case OVS_ACTION_ATTR_CLONE: { | |
1446 | bool last = nla_is_last(a, rem); | |
1447 | ||
1448 | err = clone(dp, skb, key, a, last); | |
1449 | if (last) | |
1450 | return err; | |
1451 | ||
1452 | break; | |
1453 | } | |
4d5ec89f NS |
1454 | |
1455 | case OVS_ACTION_ATTR_CHECK_PKT_LEN: { | |
1456 | bool last = nla_is_last(a, rem); | |
1457 | ||
1458 | err = execute_check_pkt_len(dp, skb, key, a, last); | |
1459 | if (last) | |
1460 | return err; | |
1461 | ||
1462 | break; | |
1463 | } | |
744676e7 MC |
1464 | |
1465 | case OVS_ACTION_ATTR_DEC_TTL: | |
1466 | err = execute_dec_ttl(skb, key); | |
a5317f3b EC |
1467 | if (err == -EHOSTUNREACH) |
1468 | return dec_ttl_exception_handler(dp, skb, | |
1469 | key, a); | |
744676e7 | 1470 | break; |
ccb1352e JG |
1471 | } |
1472 | ||
1473 | if (unlikely(err)) { | |
1474 | kfree_skb(skb); | |
1475 | return err; | |
1476 | } | |
1477 | } | |
1478 | ||
5b8784aa | 1479 | consume_skb(skb); |
ccb1352e JG |
1480 | return 0; |
1481 | } | |
1482 | ||
bef7f756 | 1483 | /* Execute the actions on the clone of the packet. The effect of the |
1484 | * execution does not affect the original 'skb' nor the original 'key'. | |
1485 | * | |
1486 | * The execution may be deferred in case the actions can not be executed | |
1487 | * immediately. | |
1488 | */ | |
1489 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, | |
1490 | struct sw_flow_key *key, u32 recirc_id, | |
1491 | const struct nlattr *actions, int len, | |
1492 | bool last, bool clone_flow_key) | |
1493 | { | |
1494 | struct deferred_action *da; | |
1495 | struct sw_flow_key *clone; | |
1496 | ||
1497 | skb = last ? skb : skb_clone(skb, GFP_ATOMIC); | |
1498 | if (!skb) { | |
1499 | /* Out of memory, skip this action. | |
1500 | */ | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | /* When clone_flow_key is false, the 'key' will not be change | |
1505 | * by the actions, then the 'key' can be used directly. | |
1506 | * Otherwise, try to clone key from the next recursion level of | |
1507 | * 'flow_keys'. If clone is successful, execute the actions | |
1508 | * without deferring. | |
1509 | */ | |
1510 | clone = clone_flow_key ? clone_key(key) : key; | |
1511 | if (clone) { | |
1512 | int err = 0; | |
1513 | ||
1514 | if (actions) { /* Sample action */ | |
1515 | if (clone_flow_key) | |
1516 | __this_cpu_inc(exec_actions_level); | |
1517 | ||
1518 | err = do_execute_actions(dp, skb, clone, | |
1519 | actions, len); | |
1520 | ||
1521 | if (clone_flow_key) | |
1522 | __this_cpu_dec(exec_actions_level); | |
1523 | } else { /* Recirc action */ | |
1524 | clone->recirc_id = recirc_id; | |
1525 | ovs_dp_process_packet(skb, clone); | |
1526 | } | |
1527 | return err; | |
1528 | } | |
1529 | ||
1530 | /* Out of 'flow_keys' space. Defer actions */ | |
1531 | da = add_deferred_actions(skb, key, actions, len); | |
1532 | if (da) { | |
1533 | if (!actions) { /* Recirc action */ | |
1534 | key = &da->pkt_key; | |
1535 | key->recirc_id = recirc_id; | |
1536 | } | |
1537 | } else { | |
1538 | /* Out of per CPU action FIFO space. Drop the 'skb' and | |
1539 | * log an error. | |
1540 | */ | |
1541 | kfree_skb(skb); | |
1542 | ||
1543 | if (net_ratelimit()) { | |
1544 | if (actions) { /* Sample action */ | |
1545 | pr_warn("%s: deferred action limit reached, drop sample action\n", | |
1546 | ovs_dp_name(dp)); | |
1547 | } else { /* Recirc action */ | |
1548 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
1549 | ovs_dp_name(dp)); | |
1550 | } | |
1551 | } | |
1552 | } | |
1553 | return 0; | |
1554 | } | |
1555 | ||
971427f3 AZ |
1556 | static void process_deferred_actions(struct datapath *dp) |
1557 | { | |
1558 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
1559 | ||
1560 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
1561 | if (action_fifo_is_empty(fifo)) | |
1562 | return; | |
1563 | ||
1564 | /* Finishing executing all deferred actions. */ | |
1565 | do { | |
1566 | struct deferred_action *da = action_fifo_get(fifo); | |
1567 | struct sk_buff *skb = da->skb; | |
1568 | struct sw_flow_key *key = &da->pkt_key; | |
1569 | const struct nlattr *actions = da->actions; | |
47c697aa | 1570 | int actions_len = da->actions_len; |
971427f3 AZ |
1571 | |
1572 | if (actions) | |
47c697aa | 1573 | do_execute_actions(dp, skb, key, actions, actions_len); |
971427f3 AZ |
1574 | else |
1575 | ovs_dp_process_packet(skb, key); | |
1576 | } while (!action_fifo_is_empty(fifo)); | |
1577 | ||
1578 | /* Reset FIFO for the next packet. */ | |
1579 | action_fifo_init(fifo); | |
1580 | } | |
1581 | ||
ccb1352e | 1582 | /* Execute a list of actions against 'skb'. */ |
2ff3e4e4 | 1583 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
12eb18f7 TG |
1584 | const struct sw_flow_actions *acts, |
1585 | struct sw_flow_key *key) | |
ccb1352e | 1586 | { |
b064d0d8 HFS |
1587 | int err, level; |
1588 | ||
1589 | level = __this_cpu_inc_return(exec_actions_level); | |
2679d040 | 1590 | if (unlikely(level > OVS_RECURSION_LIMIT)) { |
b064d0d8 HFS |
1591 | net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n", |
1592 | ovs_dp_name(dp)); | |
1593 | kfree_skb(skb); | |
1594 | err = -ENETDOWN; | |
1595 | goto out; | |
1596 | } | |
971427f3 | 1597 | |
494bea39 | 1598 | OVS_CB(skb)->acts_origlen = acts->orig_len; |
971427f3 AZ |
1599 | err = do_execute_actions(dp, skb, key, |
1600 | acts->actions, acts->actions_len); | |
1601 | ||
b064d0d8 | 1602 | if (level == 1) |
971427f3 AZ |
1603 | process_deferred_actions(dp); |
1604 | ||
b064d0d8 HFS |
1605 | out: |
1606 | __this_cpu_dec(exec_actions_level); | |
971427f3 AZ |
1607 | return err; |
1608 | } | |
1609 | ||
1610 | int action_fifos_init(void) | |
1611 | { | |
1612 | action_fifos = alloc_percpu(struct action_fifo); | |
1613 | if (!action_fifos) | |
1614 | return -ENOMEM; | |
ccb1352e | 1615 | |
4572ef52 | 1616 | flow_keys = alloc_percpu(struct action_flow_keys); |
1617 | if (!flow_keys) { | |
2679d040 LR |
1618 | free_percpu(action_fifos); |
1619 | return -ENOMEM; | |
1620 | } | |
1621 | ||
971427f3 AZ |
1622 | return 0; |
1623 | } | |
1624 | ||
1625 | void action_fifos_exit(void) | |
1626 | { | |
1627 | free_percpu(action_fifos); | |
4572ef52 | 1628 | free_percpu(flow_keys); |
ccb1352e | 1629 | } |