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064af421 | 1 | /* |
58afdef1 | 2 | * Copyright (c) 2007-2017 Nicira, Inc. |
a14bc59f | 3 | * |
a9a29d22 JG |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
064af421 BP |
17 | */ |
18 | ||
e9141eec PS |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
064af421 BP |
21 | #include <linux/skbuff.h> |
22 | #include <linux/in.h> | |
23 | #include <linux/ip.h> | |
077257b8 | 24 | #include <linux/openvswitch.h> |
a94ebc39 | 25 | #include <linux/netfilter_ipv6.h> |
10f72e3d | 26 | #include <linux/sctp.h> |
064af421 BP |
27 | #include <linux/tcp.h> |
28 | #include <linux/udp.h> | |
29 | #include <linux/in6.h> | |
401eeb92 | 30 | #include <linux/if_arp.h> |
064af421 | 31 | #include <linux/if_vlan.h> |
a0fb56c1 | 32 | |
a94ebc39 | 33 | #include <net/dst.h> |
064af421 | 34 | #include <net/ip.h> |
bc7a5acd | 35 | #include <net/ipv6.h> |
064af421 | 36 | #include <net/checksum.h> |
530180fd | 37 | #include <net/dsfield.h> |
2baf0e0c | 38 | #include <net/mpls.h> |
10f72e3d | 39 | #include <net/sctp/checksum.h> |
f2459fe7 | 40 | |
f2459fe7 | 41 | #include "datapath.h" |
a94ebc39 | 42 | #include "conntrack.h" |
ccf43786 | 43 | #include "gso.h" |
f2459fe7 | 44 | #include "vport.h" |
96b82f6d | 45 | #include "flow_netlink.h" |
064af421 | 46 | |
e74d4817 PS |
47 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
48 | struct sw_flow_key *key, | |
49 | const struct nlattr *attr, int len); | |
50 | ||
2c8c4fb7 AZ |
51 | struct deferred_action { |
52 | struct sk_buff *skb; | |
53 | const struct nlattr *actions; | |
615fa7ba | 54 | int actions_len; |
2c8c4fb7 AZ |
55 | |
56 | /* Store pkt_key clone when creating deferred action. */ | |
57 | struct sw_flow_key pkt_key; | |
58 | }; | |
59 | ||
a94ebc39 JS |
60 | #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN) |
61 | struct ovs_frag_data { | |
62 | unsigned long dst; | |
63 | struct vport *vport; | |
86c2eb45 | 64 | struct ovs_gso_cb cb; |
a94ebc39 | 65 | __be16 inner_protocol; |
279ecabe YHW |
66 | u16 network_offset; /* valid only for MPLS */ |
67 | u16 vlan_tci; | |
a94ebc39 JS |
68 | __be16 vlan_proto; |
69 | unsigned int l2_len; | |
f80d0524 | 70 | u8 mac_proto; |
a94ebc39 JS |
71 | u8 l2_data[MAX_L2_LEN]; |
72 | }; | |
73 | ||
74 | static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage); | |
75 | ||
2c8c4fb7 | 76 | #define DEFERRED_ACTION_FIFO_SIZE 10 |
615539ab LR |
77 | #define OVS_RECURSION_LIMIT 4 |
78 | #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2) | |
2c8c4fb7 AZ |
79 | struct action_fifo { |
80 | int head; | |
81 | int tail; | |
82 | /* Deferred action fifo queue storage. */ | |
83 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; | |
84 | }; | |
85 | ||
58afdef1 | 86 | struct action_flow_keys { |
615539ab LR |
87 | struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD]; |
88 | }; | |
77a9a338 | 89 | |
615539ab | 90 | static struct action_fifo __percpu *action_fifos; |
58afdef1 | 91 | static struct action_flow_keys __percpu *flow_keys; |
2c8c4fb7 AZ |
92 | static DEFINE_PER_CPU(int, exec_actions_level); |
93 | ||
58afdef1 AZ |
94 | /* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys' |
95 | * space. Return NULL if out of key spaces. | |
96 | */ | |
97 | static struct sw_flow_key *clone_key(const struct sw_flow_key *key_) | |
98 | { | |
99 | struct action_flow_keys *keys = this_cpu_ptr(flow_keys); | |
100 | int level = this_cpu_read(exec_actions_level); | |
101 | struct sw_flow_key *key = NULL; | |
102 | ||
103 | if (level <= OVS_DEFERRED_ACTION_THRESHOLD) { | |
104 | key = &keys->key[level - 1]; | |
105 | *key = *key_; | |
106 | } | |
107 | ||
108 | return key; | |
109 | } | |
110 | ||
2c8c4fb7 AZ |
111 | static void action_fifo_init(struct action_fifo *fifo) |
112 | { | |
113 | fifo->head = 0; | |
114 | fifo->tail = 0; | |
115 | } | |
116 | ||
f1f60b85 | 117 | static bool action_fifo_is_empty(const struct action_fifo *fifo) |
2c8c4fb7 AZ |
118 | { |
119 | return (fifo->head == fifo->tail); | |
120 | } | |
121 | ||
e74d4817 | 122 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) |
2c8c4fb7 AZ |
123 | { |
124 | if (action_fifo_is_empty(fifo)) | |
125 | return NULL; | |
126 | ||
127 | return &fifo->fifo[fifo->tail++]; | |
128 | } | |
129 | ||
e74d4817 | 130 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) |
2c8c4fb7 AZ |
131 | { |
132 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) | |
133 | return NULL; | |
134 | ||
135 | return &fifo->fifo[fifo->head++]; | |
136 | } | |
137 | ||
e74d4817 PS |
138 | /* Return queue entry if fifo is not full */ |
139 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, | |
615fa7ba AZ |
140 | const struct sw_flow_key *key, |
141 | const struct nlattr *actions, | |
142 | const int actions_len) | |
2c8c4fb7 AZ |
143 | { |
144 | struct action_fifo *fifo; | |
145 | struct deferred_action *da; | |
146 | ||
147 | fifo = this_cpu_ptr(action_fifos); | |
148 | da = action_fifo_put(fifo); | |
149 | if (da) { | |
150 | da->skb = skb; | |
615fa7ba AZ |
151 | da->actions = actions; |
152 | da->actions_len = actions_len; | |
e74d4817 | 153 | da->pkt_key = *key; |
2c8c4fb7 AZ |
154 | } |
155 | ||
e74d4817 | 156 | return da; |
e16138e2 PS |
157 | } |
158 | ||
e74d4817 | 159 | static void invalidate_flow_key(struct sw_flow_key *key) |
e16138e2 | 160 | { |
16d76400 | 161 | key->mac_proto |= SW_FLOW_KEY_INVALID; |
e16138e2 PS |
162 | } |
163 | ||
f1f60b85 | 164 | static bool is_flow_key_valid(const struct sw_flow_key *key) |
e16138e2 | 165 | { |
16d76400 | 166 | return !(key->mac_proto & SW_FLOW_KEY_INVALID); |
e16138e2 PS |
167 | } |
168 | ||
d4004f8d AZ |
169 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, |
170 | struct sw_flow_key *key, | |
171 | u32 recirc_id, | |
172 | const struct nlattr *actions, int len, | |
173 | bool last, bool clone_flow_key); | |
174 | ||
b51367aa PS |
175 | static void update_ethertype(struct sk_buff *skb, struct ethhdr *hdr, |
176 | __be16 ethertype) | |
177 | { | |
178 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
179 | __be16 diff[] = { ~(hdr->h_proto), ethertype }; | |
180 | ||
183b5bba | 181 | skb->csum = csum_partial((char *)diff, sizeof(diff), skb->csum); |
b51367aa PS |
182 | } |
183 | ||
184 | hdr->h_proto = ethertype; | |
185 | } | |
186 | ||
e74d4817 | 187 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
ccf43786 SH |
188 | const struct ovs_action_push_mpls *mpls) |
189 | { | |
65590144 | 190 | struct mpls_shim_hdr *new_mpls_lse; |
ccf43786 | 191 | |
2baf0e0c | 192 | /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */ |
8063e095 | 193 | if (skb->encapsulation) |
2baf0e0c PS |
194 | return -ENOTSUPP; |
195 | ||
ccf43786 SH |
196 | if (skb_cow_head(skb, MPLS_HLEN) < 0) |
197 | return -ENOMEM; | |
198 | ||
65590144 YHW |
199 | if (!ovs_skb_get_inner_protocol(skb)) { |
200 | skb_set_inner_network_header(skb, skb->mac_len); | |
201 | ovs_skb_set_inner_protocol(skb, skb->protocol); | |
202 | } | |
203 | ||
ccf43786 SH |
204 | skb_push(skb, MPLS_HLEN); |
205 | memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb), | |
206 | skb->mac_len); | |
207 | skb_reset_mac_header(skb); | |
65590144 YHW |
208 | #ifdef MPLS_HEADER_IS_L3 |
209 | skb_set_network_header(skb, skb->mac_len); | |
210 | #endif | |
ccf43786 | 211 | |
65590144 YHW |
212 | new_mpls_lse = mpls_hdr(skb); |
213 | new_mpls_lse->label_stack_entry = mpls->mpls_lse; | |
ccf43786 | 214 | |
ea3acd7a | 215 | skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN); |
ccf43786 | 216 | |
edd6d098 YY |
217 | if (ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET) |
218 | update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype); | |
ccf43786 | 219 | skb->protocol = mpls->mpls_ethertype; |
2baf0e0c | 220 | |
e74d4817 | 221 | invalidate_flow_key(key); |
ccf43786 SH |
222 | return 0; |
223 | } | |
224 | ||
e74d4817 PS |
225 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
226 | const __be16 ethertype) | |
ccf43786 | 227 | { |
ccf43786 SH |
228 | int err; |
229 | ||
5cce04b6 | 230 | err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); |
ccf43786 SH |
231 | if (unlikely(err)) |
232 | return err; | |
233 | ||
65590144 | 234 | skb_postpull_rcsum(skb, mpls_hdr(skb), MPLS_HLEN); |
ccf43786 SH |
235 | |
236 | memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), | |
237 | skb->mac_len); | |
238 | ||
239 | __skb_pull(skb, MPLS_HLEN); | |
240 | skb_reset_mac_header(skb); | |
65590144 | 241 | skb_set_network_header(skb, skb->mac_len); |
ccf43786 | 242 | |
edd6d098 YY |
243 | if (ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET) { |
244 | struct ethhdr *hdr; | |
245 | ||
65590144 | 246 | /* mpls_hdr() is used to locate the ethertype |
edd6d098 YY |
247 | * field correctly in the presence of VLAN tags. |
248 | */ | |
65590144 | 249 | hdr = (struct ethhdr *)((void*)mpls_hdr(skb) - ETH_HLEN); |
edd6d098 YY |
250 | update_ethertype(skb, hdr, ethertype); |
251 | } | |
ccf43786 SH |
252 | if (eth_p_mpls(skb->protocol)) |
253 | skb->protocol = ethertype; | |
2baf0e0c | 254 | |
e74d4817 | 255 | invalidate_flow_key(key); |
ccf43786 SH |
256 | return 0; |
257 | } | |
258 | ||
b940b3d7 JR |
259 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key, |
260 | const __be32 *mpls_lse, const __be32 *mask) | |
ccf43786 | 261 | { |
65590144 | 262 | struct mpls_shim_hdr *stack; |
b940b3d7 | 263 | __be32 lse; |
ccf43786 SH |
264 | int err; |
265 | ||
5cce04b6 | 266 | err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); |
ccf43786 SH |
267 | if (unlikely(err)) |
268 | return err; | |
269 | ||
65590144 YHW |
270 | stack = mpls_hdr(skb); |
271 | lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask); | |
ccf43786 | 272 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
65590144 | 273 | __be32 diff[] = { ~(stack->label_stack_entry), lse }; |
b940b3d7 | 274 | |
183b5bba | 275 | skb->csum = csum_partial((char *)diff, sizeof(diff), skb->csum); |
ccf43786 SH |
276 | } |
277 | ||
65590144 | 278 | stack->label_stack_entry = lse; |
b940b3d7 | 279 | flow_key->mpls.top_lse = lse; |
ccf43786 SH |
280 | return 0; |
281 | } | |
282 | ||
e74d4817 | 283 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
064af421 | 284 | { |
d9065a90 | 285 | int err; |
10db8b20 | 286 | |
97894370 | 287 | err = skb_vlan_pop(skb); |
d7efce7b | 288 | if (skb_vlan_tag_present(skb)) { |
97894370 | 289 | invalidate_flow_key(key); |
d7efce7b YY |
290 | } else { |
291 | key->eth.vlan.tci = 0; | |
292 | key->eth.vlan.tpid = 0; | |
293 | } | |
97894370 | 294 | return err; |
d9065a90 PS |
295 | } |
296 | ||
e74d4817 PS |
297 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
298 | const struct ovs_action_push_vlan *vlan) | |
d9065a90 | 299 | { |
d7efce7b | 300 | if (skb_vlan_tag_present(skb)) { |
e74d4817 | 301 | invalidate_flow_key(key); |
d7efce7b YY |
302 | } else { |
303 | key->eth.vlan.tci = vlan->vlan_tci; | |
304 | key->eth.vlan.tpid = vlan->vlan_tpid; | |
305 | } | |
97894370 | 306 | return skb_vlan_push(skb, vlan->vlan_tpid, |
9feb5bda | 307 | ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK); |
064af421 BP |
308 | } |
309 | ||
b940b3d7 JR |
310 | /* 'src' is already properly masked. */ |
311 | static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_) | |
312 | { | |
313 | u16 *dst = (u16 *)dst_; | |
314 | const u16 *src = (const u16 *)src_; | |
315 | const u16 *mask = (const u16 *)mask_; | |
316 | ||
e281bb23 JS |
317 | OVS_SET_MASKED(dst[0], src[0], mask[0]); |
318 | OVS_SET_MASKED(dst[1], src[1], mask[1]); | |
319 | OVS_SET_MASKED(dst[2], src[2], mask[2]); | |
b940b3d7 JR |
320 | } |
321 | ||
322 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
323 | const struct ovs_key_ethernet *key, | |
324 | const struct ovs_key_ethernet *mask) | |
ca78c6b6 | 325 | { |
4edb9ae9 | 326 | int err; |
b940b3d7 | 327 | |
5cce04b6 | 328 | err = skb_ensure_writable(skb, ETH_HLEN); |
4edb9ae9 PS |
329 | if (unlikely(err)) |
330 | return err; | |
331 | ||
237c4f2a | 332 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 333 | |
b940b3d7 JR |
334 | ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src, |
335 | mask->eth_src); | |
336 | ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst, | |
337 | mask->eth_dst); | |
4edb9ae9 | 338 | |
ea3acd7a | 339 | skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 340 | |
b940b3d7 JR |
341 | ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source); |
342 | ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest); | |
4edb9ae9 | 343 | return 0; |
ca78c6b6 BP |
344 | } |
345 | ||
6fcecb85 YY |
346 | /* pop_eth does not support VLAN packets as this action is never called |
347 | * for them. | |
348 | */ | |
349 | static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key) | |
350 | { | |
351 | skb_pull_rcsum(skb, ETH_HLEN); | |
352 | skb_reset_mac_header(skb); | |
353 | skb_reset_mac_len(skb); | |
354 | ||
355 | /* safe right before invalidate_flow_key */ | |
356 | key->mac_proto = MAC_PROTO_NONE; | |
357 | invalidate_flow_key(key); | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static int push_eth(struct sk_buff *skb, struct sw_flow_key *key, | |
362 | const struct ovs_action_push_eth *ethh) | |
363 | { | |
364 | struct ethhdr *hdr; | |
365 | ||
366 | /* Add the new Ethernet header */ | |
367 | if (skb_cow_head(skb, ETH_HLEN) < 0) | |
368 | return -ENOMEM; | |
369 | ||
370 | skb_push(skb, ETH_HLEN); | |
371 | skb_reset_mac_header(skb); | |
372 | skb_reset_mac_len(skb); | |
373 | ||
374 | hdr = eth_hdr(skb); | |
375 | ether_addr_copy(hdr->h_source, ethh->addresses.eth_src); | |
376 | ether_addr_copy(hdr->h_dest, ethh->addresses.eth_dst); | |
377 | hdr->h_proto = skb->protocol; | |
378 | ||
379 | skb_postpush_rcsum(skb, hdr, ETH_HLEN); | |
380 | ||
381 | /* safe right before invalidate_flow_key */ | |
382 | key->mac_proto = MAC_PROTO_ETHERNET; | |
383 | invalidate_flow_key(key); | |
384 | return 0; | |
385 | } | |
386 | ||
96b82f6d YY |
387 | static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key, |
388 | const struct nshhdr *nh) | |
389 | { | |
390 | int err; | |
391 | ||
392 | err = ovs_nsh_push(skb, nh); | |
393 | if (err) | |
394 | return err; | |
395 | ||
396 | /* safe right before invalidate_flow_key */ | |
397 | key->mac_proto = MAC_PROTO_NONE; | |
398 | invalidate_flow_key(key); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key) | |
403 | { | |
404 | int err; | |
405 | ||
406 | err = ovs_nsh_pop(skb); | |
407 | if (err) | |
408 | return err; | |
409 | ||
410 | /* safe right before invalidate_flow_key */ | |
411 | if (skb->protocol == htons(ETH_P_TEB)) | |
412 | key->mac_proto = MAC_PROTO_ETHERNET; | |
413 | else | |
414 | key->mac_proto = MAC_PROTO_NONE; | |
415 | invalidate_flow_key(key); | |
416 | return 0; | |
417 | } | |
418 | ||
efdb0c9f GG |
419 | static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh, |
420 | __be32 addr, __be32 new_addr) | |
ca78c6b6 BP |
421 | { |
422 | int transport_len = skb->len - skb_transport_offset(skb); | |
4edb9ae9 | 423 | |
efdb0c9f GG |
424 | if (nh->frag_off & htons(IP_OFFSET)) |
425 | return; | |
426 | ||
4edb9ae9 | 427 | if (nh->protocol == IPPROTO_TCP) { |
ca78c6b6 | 428 | if (likely(transport_len >= sizeof(struct tcphdr))) |
4edb9ae9 | 429 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, |
8063e095 | 430 | addr, new_addr, true); |
4edb9ae9 | 431 | } else if (nh->protocol == IPPROTO_UDP) { |
55ce87bc JG |
432 | if (likely(transport_len >= sizeof(struct udphdr))) { |
433 | struct udphdr *uh = udp_hdr(skb); | |
434 | ||
237c4f2a | 435 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
55ce87bc | 436 | inet_proto_csum_replace4(&uh->check, skb, |
8063e095 | 437 | addr, new_addr, true); |
55ce87bc JG |
438 | if (!uh->check) |
439 | uh->check = CSUM_MANGLED_0; | |
440 | } | |
441 | } | |
ca78c6b6 | 442 | } |
4edb9ae9 | 443 | |
efdb0c9f GG |
444 | } |
445 | ||
446 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, | |
447 | __be32 *addr, __be32 new_addr) | |
448 | { | |
449 | update_ip_l4_checksum(skb, nh, *addr, new_addr); | |
4edb9ae9 | 450 | csum_replace4(&nh->check, *addr, new_addr); |
e2f3178f | 451 | skb_clear_hash(skb); |
4edb9ae9 | 452 | *addr = new_addr; |
ca78c6b6 BP |
453 | } |
454 | ||
bc7a5acd AA |
455 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
456 | __be32 addr[4], const __be32 new_addr[4]) | |
457 | { | |
458 | int transport_len = skb->len - skb_transport_offset(skb); | |
459 | ||
00894212 | 460 | if (l4_proto == NEXTHDR_TCP) { |
bc7a5acd AA |
461 | if (likely(transport_len >= sizeof(struct tcphdr))) |
462 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
8063e095 | 463 | addr, new_addr, true); |
00894212 | 464 | } else if (l4_proto == NEXTHDR_UDP) { |
bc7a5acd AA |
465 | if (likely(transport_len >= sizeof(struct udphdr))) { |
466 | struct udphdr *uh = udp_hdr(skb); | |
467 | ||
237c4f2a | 468 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
bc7a5acd | 469 | inet_proto_csum_replace16(&uh->check, skb, |
8063e095 | 470 | addr, new_addr, true); |
bc7a5acd AA |
471 | if (!uh->check) |
472 | uh->check = CSUM_MANGLED_0; | |
473 | } | |
474 | } | |
00894212 JG |
475 | } else if (l4_proto == NEXTHDR_ICMP) { |
476 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
477 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
8063e095 | 478 | skb, addr, new_addr, true); |
bc7a5acd AA |
479 | } |
480 | } | |
481 | ||
b940b3d7 JR |
482 | static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4], |
483 | const __be32 mask[4], __be32 masked[4]) | |
484 | { | |
e281bb23 JS |
485 | masked[0] = OVS_MASKED(old[0], addr[0], mask[0]); |
486 | masked[1] = OVS_MASKED(old[1], addr[1], mask[1]); | |
487 | masked[2] = OVS_MASKED(old[2], addr[2], mask[2]); | |
488 | masked[3] = OVS_MASKED(old[3], addr[3], mask[3]); | |
b940b3d7 JR |
489 | } |
490 | ||
bc7a5acd AA |
491 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, |
492 | __be32 addr[4], const __be32 new_addr[4], | |
493 | bool recalculate_csum) | |
494 | { | |
51cf5e71 | 495 | if (likely(recalculate_csum)) |
bc7a5acd AA |
496 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); |
497 | ||
e2f3178f | 498 | skb_clear_hash(skb); |
bc7a5acd AA |
499 | memcpy(addr, new_addr, sizeof(__be32[4])); |
500 | } | |
501 | ||
b940b3d7 | 502 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask) |
bc7a5acd | 503 | { |
b940b3d7 | 504 | /* Bits 21-24 are always unmasked, so this retains their values. */ |
e281bb23 JS |
505 | OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16)); |
506 | OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8)); | |
507 | OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask); | |
bc7a5acd AA |
508 | } |
509 | ||
b940b3d7 JR |
510 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl, |
511 | u8 mask) | |
bc7a5acd | 512 | { |
e281bb23 | 513 | new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask); |
bc7a5acd | 514 | |
a61680c6 JP |
515 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); |
516 | nh->ttl = new_ttl; | |
517 | } | |
518 | ||
b940b3d7 JR |
519 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key, |
520 | const struct ovs_key_ipv4 *key, | |
521 | const struct ovs_key_ipv4 *mask) | |
064af421 | 522 | { |
ca78c6b6 | 523 | struct iphdr *nh; |
b940b3d7 | 524 | __be32 new_addr; |
10db8b20 | 525 | int err; |
ca78c6b6 | 526 | |
5cce04b6 TG |
527 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
528 | sizeof(struct iphdr)); | |
10db8b20 JG |
529 | if (unlikely(err)) |
530 | return err; | |
ca78c6b6 BP |
531 | |
532 | nh = ip_hdr(skb); | |
ca78c6b6 | 533 | |
b940b3d7 JR |
534 | /* Setting an IP addresses is typically only a side effect of |
535 | * matching on them in the current userspace implementation, so it | |
536 | * makes sense to check if the value actually changed. | |
537 | */ | |
538 | if (mask->ipv4_src) { | |
e281bb23 | 539 | new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src); |
ca78c6b6 | 540 | |
b940b3d7 JR |
541 | if (unlikely(new_addr != nh->saddr)) { |
542 | set_ip_addr(skb, nh, &nh->saddr, new_addr); | |
543 | flow_key->ipv4.addr.src = new_addr; | |
544 | } | |
e16138e2 | 545 | } |
b940b3d7 | 546 | if (mask->ipv4_dst) { |
e281bb23 | 547 | new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst); |
a4a26436 | 548 | |
b940b3d7 JR |
549 | if (unlikely(new_addr != nh->daddr)) { |
550 | set_ip_addr(skb, nh, &nh->daddr, new_addr); | |
551 | flow_key->ipv4.addr.dst = new_addr; | |
552 | } | |
e16138e2 | 553 | } |
b940b3d7 JR |
554 | if (mask->ipv4_tos) { |
555 | ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos); | |
556 | flow_key->ip.tos = nh->tos; | |
557 | } | |
558 | if (mask->ipv4_ttl) { | |
559 | set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl); | |
560 | flow_key->ip.ttl = nh->ttl; | |
e16138e2 | 561 | } |
a61680c6 | 562 | |
10db8b20 | 563 | return 0; |
064af421 BP |
564 | } |
565 | ||
b940b3d7 JR |
566 | static bool is_ipv6_mask_nonzero(const __be32 addr[4]) |
567 | { | |
568 | return !!(addr[0] | addr[1] | addr[2] | addr[3]); | |
569 | } | |
570 | ||
571 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
572 | const struct ovs_key_ipv6 *key, | |
573 | const struct ovs_key_ipv6 *mask) | |
bc7a5acd AA |
574 | { |
575 | struct ipv6hdr *nh; | |
576 | int err; | |
bc7a5acd | 577 | |
5cce04b6 TG |
578 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
579 | sizeof(struct ipv6hdr)); | |
bc7a5acd AA |
580 | if (unlikely(err)) |
581 | return err; | |
582 | ||
583 | nh = ipv6_hdr(skb); | |
bc7a5acd | 584 | |
b940b3d7 JR |
585 | /* Setting an IP addresses is typically only a side effect of |
586 | * matching on them in the current userspace implementation, so it | |
587 | * makes sense to check if the value actually changed. | |
588 | */ | |
589 | if (is_ipv6_mask_nonzero(mask->ipv6_src)) { | |
590 | __be32 *saddr = (__be32 *)&nh->saddr; | |
591 | __be32 masked[4]; | |
592 | ||
593 | mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked); | |
594 | ||
595 | if (unlikely(memcmp(saddr, masked, sizeof(masked)))) { | |
49a8eef8 | 596 | set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked, |
b940b3d7 JR |
597 | true); |
598 | memcpy(&flow_key->ipv6.addr.src, masked, | |
599 | sizeof(flow_key->ipv6.addr.src)); | |
600 | } | |
601 | } | |
602 | if (is_ipv6_mask_nonzero(mask->ipv6_dst)) { | |
bc7a5acd | 603 | unsigned int offset = 0; |
8abaa53c | 604 | int flags = IP6_FH_F_SKIP_RH; |
bc7a5acd | 605 | bool recalc_csum = true; |
b940b3d7 JR |
606 | __be32 *daddr = (__be32 *)&nh->daddr; |
607 | __be32 masked[4]; | |
608 | ||
609 | mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked); | |
610 | ||
611 | if (unlikely(memcmp(daddr, masked, sizeof(masked)))) { | |
612 | if (ipv6_ext_hdr(nh->nexthdr)) | |
613 | recalc_csum = (ipv6_find_hdr(skb, &offset, | |
614 | NEXTHDR_ROUTING, | |
615 | NULL, &flags) | |
616 | != NEXTHDR_ROUTING); | |
617 | ||
49a8eef8 | 618 | set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked, |
b940b3d7 JR |
619 | recalc_csum); |
620 | memcpy(&flow_key->ipv6.addr.dst, masked, | |
621 | sizeof(flow_key->ipv6.addr.dst)); | |
622 | } | |
623 | } | |
624 | if (mask->ipv6_tclass) { | |
625 | ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass); | |
626 | flow_key->ip.tos = ipv6_get_dsfield(nh); | |
627 | } | |
628 | if (mask->ipv6_label) { | |
629 | set_ipv6_fl(nh, ntohl(key->ipv6_label), | |
630 | ntohl(mask->ipv6_label)); | |
631 | flow_key->ipv6.label = | |
632 | *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
633 | } | |
634 | if (mask->ipv6_hlimit) { | |
e281bb23 JS |
635 | OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit, |
636 | mask->ipv6_hlimit); | |
b940b3d7 | 637 | flow_key->ip.ttl = nh->hop_limit; |
bc7a5acd | 638 | } |
bc7a5acd AA |
639 | return 0; |
640 | } | |
641 | ||
96b82f6d YY |
642 | static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key, |
643 | const struct nlattr *a) | |
644 | { | |
645 | struct nshhdr *nh; | |
646 | size_t length; | |
647 | int err; | |
648 | u8 flags; | |
649 | u8 ttl; | |
650 | int i; | |
651 | ||
652 | struct ovs_key_nsh key; | |
653 | struct ovs_key_nsh mask; | |
654 | ||
655 | err = nsh_key_from_nlattr(a, &key, &mask); | |
656 | if (err) | |
657 | return err; | |
658 | ||
659 | /* Make sure the NSH base header is there */ | |
660 | if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN)) | |
661 | return -ENOMEM; | |
662 | ||
663 | nh = nsh_hdr(skb); | |
664 | length = nsh_hdr_len(nh); | |
665 | ||
666 | /* Make sure the whole NSH header is there */ | |
667 | err = skb_ensure_writable(skb, skb_network_offset(skb) + | |
668 | length); | |
669 | if (unlikely(err)) | |
670 | return err; | |
671 | ||
672 | nh = nsh_hdr(skb); | |
673 | skb_postpull_rcsum(skb, nh, length); | |
674 | flags = nsh_get_flags(nh); | |
675 | flags = OVS_MASKED(flags, key.base.flags, mask.base.flags); | |
676 | flow_key->nsh.base.flags = flags; | |
677 | ttl = nsh_get_ttl(nh); | |
678 | ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl); | |
679 | flow_key->nsh.base.ttl = ttl; | |
680 | nsh_set_flags_and_ttl(nh, flags, ttl); | |
681 | nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr, | |
682 | mask.base.path_hdr); | |
683 | flow_key->nsh.base.path_hdr = nh->path_hdr; | |
684 | switch (nh->mdtype) { | |
685 | case NSH_M_TYPE1: | |
686 | for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) { | |
687 | nh->md1.context[i] = | |
688 | OVS_MASKED(nh->md1.context[i], key.context[i], | |
689 | mask.context[i]); | |
690 | } | |
691 | memcpy(flow_key->nsh.context, nh->md1.context, | |
692 | sizeof(nh->md1.context)); | |
693 | break; | |
694 | case NSH_M_TYPE2: | |
695 | memset(flow_key->nsh.context, 0, | |
696 | sizeof(flow_key->nsh.context)); | |
697 | break; | |
698 | default: | |
699 | return -EINVAL; | |
700 | } | |
701 | skb_postpush_rcsum(skb, nh, length); | |
702 | return 0; | |
703 | } | |
704 | ||
5cce04b6 | 705 | /* Must follow skb_ensure_writable() since that can move the skb data. */ |
4edb9ae9 | 706 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
b940b3d7 | 707 | __be16 new_port, __sum16 *check) |
959a2ecd | 708 | { |
8063e095 | 709 | inet_proto_csum_replace2(check, skb, *port, new_port, false); |
4edb9ae9 | 710 | *port = new_port; |
55ce87bc JG |
711 | } |
712 | ||
b940b3d7 JR |
713 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
714 | const struct ovs_key_udp *key, | |
715 | const struct ovs_key_udp *mask) | |
4edb9ae9 PS |
716 | { |
717 | struct udphdr *uh; | |
b940b3d7 | 718 | __be16 src, dst; |
4edb9ae9 | 719 | int err; |
10db8b20 | 720 | |
5cce04b6 TG |
721 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
722 | sizeof(struct udphdr)); | |
10db8b20 JG |
723 | if (unlikely(err)) |
724 | return err; | |
725 | ||
4edb9ae9 | 726 | uh = udp_hdr(skb); |
b940b3d7 | 727 | /* Either of the masks is non-zero, so do not bother checking them. */ |
e281bb23 JS |
728 | src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src); |
729 | dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst); | |
4edb9ae9 | 730 | |
b940b3d7 JR |
731 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
732 | if (likely(src != uh->source)) { | |
733 | set_tp_port(skb, &uh->source, src, &uh->check); | |
734 | flow_key->tp.src = src; | |
735 | } | |
736 | if (likely(dst != uh->dest)) { | |
737 | set_tp_port(skb, &uh->dest, dst, &uh->check); | |
738 | flow_key->tp.dst = dst; | |
739 | } | |
740 | ||
741 | if (unlikely(!uh->check)) | |
742 | uh->check = CSUM_MANGLED_0; | |
743 | } else { | |
744 | uh->source = src; | |
745 | uh->dest = dst; | |
746 | flow_key->tp.src = src; | |
747 | flow_key->tp.dst = dst; | |
e16138e2 | 748 | } |
10db8b20 | 749 | |
b940b3d7 JR |
750 | skb_clear_hash(skb); |
751 | ||
10db8b20 | 752 | return 0; |
959a2ecd JP |
753 | } |
754 | ||
b940b3d7 JR |
755 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
756 | const struct ovs_key_tcp *key, | |
757 | const struct ovs_key_tcp *mask) | |
064af421 | 758 | { |
4edb9ae9 | 759 | struct tcphdr *th; |
b940b3d7 | 760 | __be16 src, dst; |
10db8b20 | 761 | int err; |
064af421 | 762 | |
5cce04b6 TG |
763 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
764 | sizeof(struct tcphdr)); | |
10db8b20 JG |
765 | if (unlikely(err)) |
766 | return err; | |
ca78c6b6 | 767 | |
4edb9ae9 | 768 | th = tcp_hdr(skb); |
e281bb23 | 769 | src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src); |
b940b3d7 JR |
770 | if (likely(src != th->source)) { |
771 | set_tp_port(skb, &th->source, src, &th->check); | |
772 | flow_key->tp.src = src; | |
773 | } | |
e281bb23 | 774 | dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst); |
b940b3d7 JR |
775 | if (likely(dst != th->dest)) { |
776 | set_tp_port(skb, &th->dest, dst, &th->check); | |
777 | flow_key->tp.dst = dst; | |
e16138e2 | 778 | } |
b940b3d7 | 779 | skb_clear_hash(skb); |
ca78c6b6 | 780 | |
10db8b20 | 781 | return 0; |
064af421 BP |
782 | } |
783 | ||
b940b3d7 JR |
784 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
785 | const struct ovs_key_sctp *key, | |
786 | const struct ovs_key_sctp *mask) | |
10f72e3d | 787 | { |
b940b3d7 | 788 | unsigned int sctphoff = skb_transport_offset(skb); |
10f72e3d | 789 | struct sctphdr *sh; |
b940b3d7 | 790 | __le32 old_correct_csum, new_csum, old_csum; |
10f72e3d | 791 | int err; |
10f72e3d | 792 | |
5cce04b6 | 793 | err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr)); |
10f72e3d JS |
794 | if (unlikely(err)) |
795 | return err; | |
796 | ||
797 | sh = sctp_hdr(skb); | |
b940b3d7 JR |
798 | old_csum = sh->checksum; |
799 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
10f72e3d | 800 | |
e281bb23 JS |
801 | sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src); |
802 | sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst); | |
10f72e3d | 803 | |
b940b3d7 | 804 | new_csum = sctp_compute_cksum(skb, sctphoff); |
10f72e3d | 805 | |
b940b3d7 JR |
806 | /* Carry any checksum errors through. */ |
807 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
10f72e3d | 808 | |
b940b3d7 JR |
809 | skb_clear_hash(skb); |
810 | flow_key->tp.src = sh->source; | |
811 | flow_key->tp.dst = sh->dest; | |
10f72e3d JS |
812 | |
813 | return 0; | |
814 | } | |
815 | ||
a94ebc39 JS |
816 | static int ovs_vport_output(OVS_VPORT_OUTPUT_PARAMS) |
817 | { | |
e9326797 | 818 | struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage); |
a94ebc39 JS |
819 | struct vport *vport = data->vport; |
820 | ||
821 | if (skb_cow_head(skb, data->l2_len) < 0) { | |
822 | kfree_skb(skb); | |
823 | return -ENOMEM; | |
824 | } | |
825 | ||
826 | __skb_dst_copy(skb, data->dst); | |
86c2eb45 | 827 | *OVS_GSO_CB(skb) = data->cb; |
a94ebc39 | 828 | ovs_skb_set_inner_protocol(skb, data->inner_protocol); |
9feb5bda MM |
829 | if (data->vlan_tci & VLAN_CFI_MASK) |
830 | __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK); | |
831 | else | |
832 | __vlan_hwaccel_clear_tag(skb); | |
a94ebc39 JS |
833 | |
834 | /* Reconstruct the MAC header. */ | |
835 | skb_push(skb, data->l2_len); | |
836 | memcpy(skb->data, &data->l2_data, data->l2_len); | |
ea3acd7a | 837 | skb_postpush_rcsum(skb, skb->data, data->l2_len); |
a94ebc39 JS |
838 | skb_reset_mac_header(skb); |
839 | ||
279ecabe YHW |
840 | if (eth_p_mpls(skb->protocol)) { |
841 | skb->inner_network_header = skb->network_header; | |
842 | skb_set_network_header(skb, data->network_offset); | |
843 | skb_reset_mac_len(skb); | |
844 | } | |
845 | ||
f80d0524 | 846 | ovs_vport_send(vport, skb, data->mac_proto); |
a94ebc39 JS |
847 | return 0; |
848 | } | |
849 | ||
850 | static unsigned int | |
851 | ovs_dst_get_mtu(const struct dst_entry *dst) | |
852 | { | |
853 | return dst->dev->mtu; | |
854 | } | |
855 | ||
856 | static struct dst_ops ovs_dst_ops = { | |
857 | .family = AF_UNSPEC, | |
858 | .mtu = ovs_dst_get_mtu, | |
859 | }; | |
860 | ||
861 | /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is | |
862 | * ovs_vport_output(), which is called once per fragmented packet. | |
863 | */ | |
f80d0524 | 864 | static void prepare_frag(struct vport *vport, struct sk_buff *skb, |
279ecabe | 865 | u16 orig_network_offset, u8 mac_proto) |
a94ebc39 JS |
866 | { |
867 | unsigned int hlen = skb_network_offset(skb); | |
868 | struct ovs_frag_data *data; | |
869 | ||
e9326797 | 870 | data = this_cpu_ptr(&ovs_frag_data_storage); |
a94ebc39 JS |
871 | data->dst = (unsigned long) skb_dst(skb); |
872 | data->vport = vport; | |
86c2eb45 | 873 | data->cb = *OVS_GSO_CB(skb); |
a94ebc39 | 874 | data->inner_protocol = ovs_skb_get_inner_protocol(skb); |
279ecabe | 875 | data->network_offset = orig_network_offset; |
9feb5bda MM |
876 | if (skb_vlan_tag_present(skb)) |
877 | data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK; | |
878 | else | |
879 | data->vlan_tci = 0; | |
a94ebc39 | 880 | data->vlan_proto = skb->vlan_proto; |
f80d0524 | 881 | data->mac_proto = mac_proto; |
a94ebc39 JS |
882 | data->l2_len = hlen; |
883 | memcpy(&data->l2_data, skb->data, hlen); | |
884 | ||
885 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
886 | skb_pull(skb, hlen); | |
887 | } | |
888 | ||
025813bb | 889 | static void ovs_fragment(struct net *net, struct vport *vport, |
f80d0524 YY |
890 | struct sk_buff *skb, u16 mru, |
891 | struct sw_flow_key *key) | |
a94ebc39 | 892 | { |
279ecabe YHW |
893 | u16 orig_network_offset = 0; |
894 | ||
895 | if (eth_p_mpls(skb->protocol)) { | |
896 | orig_network_offset = skb_network_offset(skb); | |
897 | skb->network_header = skb->inner_network_header; | |
898 | } | |
899 | ||
a94ebc39 JS |
900 | if (skb_network_offset(skb) > MAX_L2_LEN) { |
901 | OVS_NLERR(1, "L2 header too long to fragment"); | |
c05e2094 | 902 | goto err; |
a94ebc39 JS |
903 | } |
904 | ||
f80d0524 | 905 | if (key->eth.type == htons(ETH_P_IP)) { |
a94ebc39 JS |
906 | struct dst_entry ovs_dst; |
907 | unsigned long orig_dst; | |
908 | ||
279ecabe YHW |
909 | prepare_frag(vport, skb, orig_network_offset, |
910 | ovs_key_mac_proto(key)); | |
a94ebc39 JS |
911 | dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1, |
912 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
913 | ovs_dst.dev = vport->dev; | |
914 | ||
915 | orig_dst = (unsigned long) skb_dst(skb); | |
916 | skb_dst_set_noref(skb, &ovs_dst); | |
917 | IPCB(skb)->frag_max_size = mru; | |
918 | ||
0374bcbe | 919 | ip_do_fragment(net, skb->sk, skb, ovs_vport_output); |
a94ebc39 | 920 | refdst_drop(orig_dst); |
f80d0524 | 921 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
a94ebc39 JS |
922 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); |
923 | unsigned long orig_dst; | |
924 | struct rt6_info ovs_rt; | |
925 | ||
09b26ccb | 926 | if (!v6ops) |
c05e2094 | 927 | goto err; |
a94ebc39 | 928 | |
279ecabe | 929 | prepare_frag(vport, skb, orig_network_offset, |
f80d0524 | 930 | ovs_key_mac_proto(key)); |
a94ebc39 JS |
931 | memset(&ovs_rt, 0, sizeof(ovs_rt)); |
932 | dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1, | |
933 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
934 | ovs_rt.dst.dev = vport->dev; | |
935 | ||
936 | orig_dst = (unsigned long) skb_dst(skb); | |
937 | skb_dst_set_noref(skb, &ovs_rt.dst); | |
938 | IP6CB(skb)->frag_max_size = mru; | |
0643a78b PS |
939 | #ifdef HAVE_IP_LOCAL_OUT_TAKES_NET |
940 | v6ops->fragment(net, skb->sk, skb, ovs_vport_output); | |
941 | #else | |
a94ebc39 | 942 | v6ops->fragment(skb->sk, skb, ovs_vport_output); |
0643a78b | 943 | #endif |
a94ebc39 JS |
944 | refdst_drop(orig_dst); |
945 | } else { | |
946 | WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.", | |
f80d0524 | 947 | ovs_vport_name(vport), ntohs(key->eth.type), mru, |
a94ebc39 | 948 | vport->dev->mtu); |
c05e2094 | 949 | goto err; |
a94ebc39 | 950 | } |
c05e2094 JS |
951 | |
952 | return; | |
953 | err: | |
954 | kfree_skb(skb); | |
a94ebc39 | 955 | } |
a94ebc39 JS |
956 | |
957 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port, | |
958 | struct sw_flow_key *key) | |
064af421 | 959 | { |
fe90efd9 | 960 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
064af421 | 961 | |
a94ebc39 JS |
962 | if (likely(vport)) { |
963 | u16 mru = OVS_CB(skb)->mru; | |
4c7804f1 WT |
964 | u32 cutlen = OVS_CB(skb)->cutlen; |
965 | ||
966 | if (unlikely(cutlen > 0)) { | |
f80d0524 | 967 | if (skb->len - cutlen > ovs_mac_header_len(key)) |
4c7804f1 WT |
968 | pskb_trim(skb, skb->len - cutlen); |
969 | else | |
f80d0524 | 970 | pskb_trim(skb, ovs_mac_header_len(key)); |
4c7804f1 | 971 | } |
a94ebc39 | 972 | |
f0b0bdd2 YY |
973 | if (likely(!mru || |
974 | (skb->len <= mru + vport->dev->hard_header_len))) { | |
f80d0524 | 975 | ovs_vport_send(vport, skb, ovs_key_mac_proto(key)); |
a94ebc39 | 976 | } else if (mru <= vport->dev->mtu) { |
025813bb | 977 | struct net *net = ovs_dp_get_net(dp); |
a94ebc39 | 978 | |
f80d0524 | 979 | ovs_fragment(net, vport, skb, mru, key); |
a94ebc39 JS |
980 | } else { |
981 | OVS_NLERR(true, "Cannot fragment IP frames"); | |
982 | kfree_skb(skb); | |
983 | } | |
984 | } else { | |
f15c8639 | 985 | kfree_skb(skb); |
a94ebc39 | 986 | } |
064af421 | 987 | } |
aad7cb91 | 988 | |
98403001 | 989 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, |
0e469d3b | 990 | struct sw_flow_key *key, const struct nlattr *attr, |
4c7804f1 WT |
991 | const struct nlattr *actions, int actions_len, |
992 | uint32_t cutlen) | |
064af421 | 993 | { |
856081f6 | 994 | struct dp_upcall_info upcall; |
98403001 | 995 | const struct nlattr *a; |
aad7cb91 | 996 | int rem, err; |
856081f6 | 997 | |
0e469d3b | 998 | memset(&upcall, 0, sizeof(upcall)); |
df2c07f4 | 999 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
a94ebc39 | 1000 | upcall.mru = OVS_CB(skb)->mru; |
98403001 | 1001 | |
aad7cb91 | 1002 | SKB_INIT_FILL_METADATA_DST(skb); |
98403001 BP |
1003 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; |
1004 | a = nla_next(a, &rem)) { | |
1005 | switch (nla_type(a)) { | |
1006 | case OVS_USERSPACE_ATTR_USERDATA: | |
1007 | upcall.userdata = a; | |
1008 | break; | |
1009 | ||
1010 | case OVS_USERSPACE_ATTR_PID: | |
28aea917 | 1011 | upcall.portid = nla_get_u32(a); |
98403001 | 1012 | break; |
8b7ea2d4 WZ |
1013 | |
1014 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
1015 | /* Get out tunnel info. */ | |
1016 | struct vport *vport; | |
1017 | ||
1018 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
1019 | if (vport) { | |
aad7cb91 PS |
1020 | err = dev_fill_metadata_dst(vport->dev, skb); |
1021 | if (!err) | |
1022 | upcall.egress_tun_info = skb_tunnel_info(skb); | |
8b7ea2d4 | 1023 | } |
e23775f2 | 1024 | |
8b7ea2d4 | 1025 | break; |
98403001 | 1026 | } |
8b7ea2d4 | 1027 | |
0e469d3b NM |
1028 | case OVS_USERSPACE_ATTR_ACTIONS: { |
1029 | /* Include actions. */ | |
1030 | upcall.actions = actions; | |
1031 | upcall.actions_len = actions_len; | |
1032 | break; | |
1033 | } | |
1034 | ||
8b7ea2d4 | 1035 | } /* End of switch. */ |
98403001 BP |
1036 | } |
1037 | ||
aad7cb91 PS |
1038 | err = ovs_dp_upcall(dp, skb, key, &upcall, cutlen); |
1039 | SKB_RESTORE_FILL_METADATA_DST(skb); | |
1040 | return err; | |
064af421 BP |
1041 | } |
1042 | ||
7d9595e3 AZ |
1043 | /* When 'last' is true, sample() should always consume the 'skb'. |
1044 | * Otherwise, sample() should keep 'skb' intact regardless what | |
1045 | * actions are executed within sample(). | |
1046 | */ | |
6ff686f2 | 1047 | static int sample(struct datapath *dp, struct sk_buff *skb, |
0e469d3b | 1048 | struct sw_flow_key *key, const struct nlattr *attr, |
7d9595e3 | 1049 | bool last) |
6ff686f2 | 1050 | { |
7d9595e3 AZ |
1051 | struct nlattr *actions; |
1052 | struct nlattr *sample_arg; | |
7d9595e3 | 1053 | int rem = nla_len(attr); |
7d9595e3 | 1054 | const struct sample_arg *arg; |
d4004f8d | 1055 | bool clone_flow_key; |
6ff686f2 | 1056 | |
7d9595e3 AZ |
1057 | /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */ |
1058 | sample_arg = nla_data(attr); | |
1059 | arg = nla_data(sample_arg); | |
1060 | actions = nla_next(sample_arg, &rem); | |
c02c4967 | 1061 | |
7d9595e3 AZ |
1062 | if ((arg->probability != U32_MAX) && |
1063 | (!arg->probability || prandom_u32() > arg->probability)) { | |
1064 | if (last) | |
1065 | consume_skb(skb); | |
1066 | return 0; | |
6ff686f2 PS |
1067 | } |
1068 | ||
d4004f8d AZ |
1069 | clone_flow_key = !arg->exec; |
1070 | return clone_execute(dp, skb, key, 0, actions, rem, last, | |
1071 | clone_flow_key); | |
6ff686f2 PS |
1072 | } |
1073 | ||
5a77cf96 YS |
1074 | /* When 'last' is true, clone() should always consume the 'skb'. |
1075 | * Otherwise, clone() should keep 'skb' intact regardless what | |
1076 | * actions are executed within clone(). | |
1077 | */ | |
1078 | static int clone(struct datapath *dp, struct sk_buff *skb, | |
1079 | struct sw_flow_key *key, const struct nlattr *attr, | |
1080 | bool last) | |
1081 | { | |
1082 | struct nlattr *actions; | |
1083 | struct nlattr *clone_arg; | |
1084 | int rem = nla_len(attr); | |
1085 | bool dont_clone_flow_key; | |
1086 | ||
1087 | /* The first action is always 'OVS_CLONE_ATTR_ARG'. */ | |
1088 | clone_arg = nla_data(attr); | |
1089 | dont_clone_flow_key = nla_get_u32(clone_arg); | |
1090 | actions = nla_next(clone_arg, &rem); | |
1091 | ||
1092 | return clone_execute(dp, skb, key, 0, actions, rem, last, | |
1093 | !dont_clone_flow_key); | |
1094 | } | |
1095 | ||
e74d4817 PS |
1096 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, |
1097 | const struct nlattr *attr) | |
7804df20 | 1098 | { |
7804df20 AZ |
1099 | struct ovs_action_hash *hash_act = nla_data(attr); |
1100 | u32 hash = 0; | |
1101 | ||
1102 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
e2f3178f | 1103 | hash = skb_get_hash(skb); |
7804df20 AZ |
1104 | hash = jhash_1word(hash, hash_act->hash_basis); |
1105 | if (!hash) | |
1106 | hash = 0x1; | |
1107 | ||
1108 | key->ovs_flow_hash = hash; | |
1109 | } | |
1110 | ||
b940b3d7 JR |
1111 | static int execute_set_action(struct sk_buff *skb, |
1112 | struct sw_flow_key *flow_key, | |
1113 | const struct nlattr *a) | |
1114 | { | |
1115 | /* Only tunnel set execution is supported without a mask. */ | |
1116 | if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) { | |
e23775f2 PS |
1117 | struct ovs_tunnel_info *tun = nla_data(a); |
1118 | ||
1119 | ovs_skb_dst_drop(skb); | |
1120 | ovs_dst_hold((struct dst_entry *)tun->tun_dst); | |
1121 | ovs_skb_dst_set(skb, (struct dst_entry *)tun->tun_dst); | |
b940b3d7 JR |
1122 | return 0; |
1123 | } | |
1124 | ||
1125 | return -EINVAL; | |
b940b3d7 JR |
1126 | } |
1127 | ||
1128 | /* Mask is at the midpoint of the data. */ | |
1129 | #define get_mask(a, type) ((const type)nla_data(a) + 1) | |
1130 | ||
1131 | static int execute_masked_set_action(struct sk_buff *skb, | |
1132 | struct sw_flow_key *flow_key, | |
1133 | const struct nlattr *a) | |
4edb9ae9 | 1134 | { |
15c39847 | 1135 | int err = 0; |
4edb9ae9 | 1136 | |
b940b3d7 | 1137 | switch (nla_type(a)) { |
abff858b | 1138 | case OVS_KEY_ATTR_PRIORITY: |
e281bb23 JS |
1139 | OVS_SET_MASKED(skb->priority, nla_get_u32(a), |
1140 | *get_mask(a, u32 *)); | |
b940b3d7 | 1141 | flow_key->phy.priority = skb->priority; |
abff858b PS |
1142 | break; |
1143 | ||
72e8bf28 | 1144 | case OVS_KEY_ATTR_SKB_MARK: |
e281bb23 | 1145 | OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *)); |
b940b3d7 | 1146 | flow_key->phy.skb_mark = skb->mark; |
72e8bf28 AA |
1147 | break; |
1148 | ||
f0cd669f | 1149 | case OVS_KEY_ATTR_TUNNEL_INFO: |
b940b3d7 JR |
1150 | /* Masked data not supported for tunnel. */ |
1151 | err = -EINVAL; | |
4edb9ae9 PS |
1152 | break; |
1153 | ||
1154 | case OVS_KEY_ATTR_ETHERNET: | |
b940b3d7 JR |
1155 | err = set_eth_addr(skb, flow_key, nla_data(a), |
1156 | get_mask(a, struct ovs_key_ethernet *)); | |
4edb9ae9 PS |
1157 | break; |
1158 | ||
96b82f6d YY |
1159 | case OVS_KEY_ATTR_NSH: |
1160 | err = set_nsh(skb, flow_key, a); | |
1161 | break; | |
1162 | ||
4edb9ae9 | 1163 | case OVS_KEY_ATTR_IPV4: |
b940b3d7 JR |
1164 | err = set_ipv4(skb, flow_key, nla_data(a), |
1165 | get_mask(a, struct ovs_key_ipv4 *)); | |
4edb9ae9 PS |
1166 | break; |
1167 | ||
bc7a5acd | 1168 | case OVS_KEY_ATTR_IPV6: |
b940b3d7 JR |
1169 | err = set_ipv6(skb, flow_key, nla_data(a), |
1170 | get_mask(a, struct ovs_key_ipv6 *)); | |
bc7a5acd AA |
1171 | break; |
1172 | ||
4edb9ae9 | 1173 | case OVS_KEY_ATTR_TCP: |
b940b3d7 JR |
1174 | err = set_tcp(skb, flow_key, nla_data(a), |
1175 | get_mask(a, struct ovs_key_tcp *)); | |
4edb9ae9 PS |
1176 | break; |
1177 | ||
1178 | case OVS_KEY_ATTR_UDP: | |
b940b3d7 JR |
1179 | err = set_udp(skb, flow_key, nla_data(a), |
1180 | get_mask(a, struct ovs_key_udp *)); | |
4edb9ae9 | 1181 | break; |
10f72e3d JS |
1182 | |
1183 | case OVS_KEY_ATTR_SCTP: | |
b940b3d7 JR |
1184 | err = set_sctp(skb, flow_key, nla_data(a), |
1185 | get_mask(a, struct ovs_key_sctp *)); | |
10f72e3d | 1186 | break; |
ccf43786 SH |
1187 | |
1188 | case OVS_KEY_ATTR_MPLS: | |
b940b3d7 JR |
1189 | err = set_mpls(skb, flow_key, nla_data(a), get_mask(a, |
1190 | __be32 *)); | |
ccf43786 | 1191 | break; |
a94ebc39 JS |
1192 | |
1193 | case OVS_KEY_ATTR_CT_STATE: | |
1194 | case OVS_KEY_ATTR_CT_ZONE: | |
372ce973 | 1195 | case OVS_KEY_ATTR_CT_MARK: |
c05e2094 | 1196 | case OVS_KEY_ATTR_CT_LABELS: |
c30b4cea JR |
1197 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4: |
1198 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6: | |
a94ebc39 JS |
1199 | err = -EINVAL; |
1200 | break; | |
4edb9ae9 | 1201 | } |
15c39847 | 1202 | |
4edb9ae9 PS |
1203 | return err; |
1204 | } | |
1205 | ||
a6059080 | 1206 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
7d16c847 | 1207 | struct sw_flow_key *key, |
d4004f8d | 1208 | const struct nlattr *a, bool last) |
a6059080 | 1209 | { |
d4004f8d | 1210 | u32 recirc_id; |
e74d4817 PS |
1211 | |
1212 | if (!is_flow_key_valid(key)) { | |
867e37ba AZ |
1213 | int err; |
1214 | ||
e74d4817 | 1215 | err = ovs_flow_key_update(skb, key); |
867e37ba AZ |
1216 | if (err) |
1217 | return err; | |
867e37ba | 1218 | } |
e74d4817 | 1219 | BUG_ON(!is_flow_key_valid(key)); |
a6059080 | 1220 | |
d4004f8d AZ |
1221 | recirc_id = nla_get_u32(a); |
1222 | return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true); | |
a6059080 AZ |
1223 | } |
1224 | ||
faa3beb4 NS |
1225 | static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb, |
1226 | struct sw_flow_key *key, | |
1227 | const struct nlattr *attr, bool last) | |
1228 | { | |
1229 | const struct nlattr *actions, *cpl_arg; | |
1230 | const struct check_pkt_len_arg *arg; | |
1231 | int rem = nla_len(attr); | |
1232 | bool clone_flow_key; | |
1233 | ||
1234 | /* The first netlink attribute in 'attr' is always | |
1235 | * 'OVS_CHECK_PKT_LEN_ATTR_ARG'. | |
1236 | */ | |
1237 | cpl_arg = nla_data(attr); | |
1238 | arg = nla_data(cpl_arg); | |
1239 | ||
1240 | if (skb->len <= arg->pkt_len) { | |
1241 | /* Second netlink attribute in 'attr' is always | |
1242 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'. | |
1243 | */ | |
1244 | actions = nla_next(cpl_arg, &rem); | |
1245 | clone_flow_key = !arg->exec_for_lesser_equal; | |
1246 | } else { | |
1247 | /* Third netlink attribute in 'attr' is always | |
1248 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'. | |
1249 | */ | |
1250 | actions = nla_next(cpl_arg, &rem); | |
1251 | actions = nla_next(actions, &rem); | |
1252 | clone_flow_key = !arg->exec_for_greater; | |
1253 | } | |
1254 | ||
1255 | return clone_execute(dp, skb, key, 0, nla_data(actions), | |
1256 | nla_len(actions), last, clone_flow_key); | |
1257 | } | |
1258 | ||
064af421 | 1259 | /* Execute a list of actions against 'skb'. */ |
871dfe07 | 1260 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
e74d4817 PS |
1261 | struct sw_flow_key *key, |
1262 | const struct nlattr *attr, int len) | |
064af421 | 1263 | { |
cdee00fd | 1264 | const struct nlattr *a; |
10db8b20 | 1265 | int rem; |
72b06300 | 1266 | |
6ff686f2 | 1267 | for (a = attr, rem = len; rem > 0; |
a4af2475 | 1268 | a = nla_next(a, &rem)) { |
10db8b20 JG |
1269 | int err = 0; |
1270 | ||
2b6a82da AZ |
1271 | switch (nla_type(a)) { |
1272 | case OVS_ACTION_ATTR_OUTPUT: { | |
1273 | int port = nla_get_u32(a); | |
1274 | struct sk_buff *clone; | |
1275 | ||
1276 | /* Every output action needs a separate clone | |
1277 | * of 'skb', In case the output action is the | |
1278 | * last action, cloning can be avoided. | |
1279 | */ | |
1280 | if (nla_is_last(a, rem)) { | |
1281 | do_output(dp, skb, port, key); | |
1282 | /* 'skb' has been used for output. | |
1283 | */ | |
1284 | return 0; | |
1285 | } | |
fe90efd9 | 1286 | |
2b6a82da AZ |
1287 | clone = skb_clone(skb, GFP_ATOMIC); |
1288 | if (clone) | |
1289 | do_output(dp, clone, port, key); | |
4c7804f1 | 1290 | OVS_CB(skb)->cutlen = 0; |
064af421 | 1291 | break; |
2b6a82da | 1292 | } |
064af421 | 1293 | |
4c7804f1 WT |
1294 | case OVS_ACTION_ATTR_TRUNC: { |
1295 | struct ovs_action_trunc *trunc = nla_data(a); | |
1296 | ||
1297 | if (skb->len > trunc->max_len) | |
1298 | OVS_CB(skb)->cutlen = skb->len - trunc->max_len; | |
1299 | break; | |
1300 | } | |
1301 | ||
df2c07f4 | 1302 | case OVS_ACTION_ATTR_USERSPACE: |
4c7804f1 WT |
1303 | output_userspace(dp, skb, key, a, attr, |
1304 | len, OVS_CB(skb)->cutlen); | |
1305 | OVS_CB(skb)->cutlen = 0; | |
064af421 | 1306 | break; |
7804df20 AZ |
1307 | |
1308 | case OVS_ACTION_ATTR_HASH: | |
e74d4817 | 1309 | execute_hash(skb, key, a); |
7804df20 | 1310 | break; |
064af421 | 1311 | |
ccf43786 | 1312 | case OVS_ACTION_ATTR_PUSH_MPLS: |
e74d4817 | 1313 | err = push_mpls(skb, key, nla_data(a)); |
ccf43786 SH |
1314 | break; |
1315 | ||
1316 | case OVS_ACTION_ATTR_POP_MPLS: | |
e74d4817 | 1317 | err = pop_mpls(skb, key, nla_get_be16(a)); |
ccf43786 SH |
1318 | break; |
1319 | ||
fea393b1 | 1320 | case OVS_ACTION_ATTR_PUSH_VLAN: |
e74d4817 | 1321 | err = push_vlan(skb, key, nla_data(a)); |
064af421 BP |
1322 | break; |
1323 | ||
fea393b1 | 1324 | case OVS_ACTION_ATTR_POP_VLAN: |
e74d4817 | 1325 | err = pop_vlan(skb, key); |
064af421 BP |
1326 | break; |
1327 | ||
d4004f8d AZ |
1328 | case OVS_ACTION_ATTR_RECIRC: { |
1329 | bool last = nla_is_last(a, rem); | |
1330 | ||
1331 | err = execute_recirc(dp, skb, key, a, last); | |
1332 | if (last) { | |
867e37ba AZ |
1333 | /* If this is the last action, the skb has |
1334 | * been consumed or freed. | |
e74d4817 PS |
1335 | * Return immediately. |
1336 | */ | |
867e37ba AZ |
1337 | return err; |
1338 | } | |
a6059080 | 1339 | break; |
d4004f8d | 1340 | } |
a6059080 | 1341 | |
4edb9ae9 | 1342 | case OVS_ACTION_ATTR_SET: |
e74d4817 | 1343 | err = execute_set_action(skb, key, nla_data(a)); |
064af421 | 1344 | break; |
c1c9c9c4 | 1345 | |
b940b3d7 JR |
1346 | case OVS_ACTION_ATTR_SET_MASKED: |
1347 | case OVS_ACTION_ATTR_SET_TO_MASKED: | |
1348 | err = execute_masked_set_action(skb, key, nla_data(a)); | |
1349 | break; | |
1350 | ||
7d9595e3 AZ |
1351 | case OVS_ACTION_ATTR_SAMPLE: { |
1352 | bool last = nla_is_last(a, rem); | |
1353 | ||
1354 | err = sample(dp, skb, key, a, last); | |
1355 | if (last) | |
1356 | return err; | |
1357 | ||
6ff686f2 | 1358 | break; |
7d9595e3 | 1359 | } |
a94ebc39 JS |
1360 | |
1361 | case OVS_ACTION_ATTR_CT: | |
c05e2094 JS |
1362 | if (!is_flow_key_valid(key)) { |
1363 | err = ovs_flow_key_update(skb, key); | |
1364 | if (err) | |
1365 | return err; | |
1366 | } | |
1367 | ||
a94ebc39 JS |
1368 | err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key, |
1369 | nla_data(a)); | |
1370 | ||
1371 | /* Hide stolen IP fragments from user space. */ | |
c05e2094 JS |
1372 | if (err) |
1373 | return err == -EINPROGRESS ? 0 : err; | |
a94ebc39 | 1374 | break; |
6fcecb85 | 1375 | |
0cdfdddd EG |
1376 | case OVS_ACTION_ATTR_CT_CLEAR: |
1377 | err = ovs_ct_clear(skb, key); | |
1378 | break; | |
1379 | ||
6fcecb85 YY |
1380 | case OVS_ACTION_ATTR_PUSH_ETH: |
1381 | err = push_eth(skb, key, nla_data(a)); | |
1382 | break; | |
1383 | ||
1384 | case OVS_ACTION_ATTR_POP_ETH: | |
1385 | err = pop_eth(skb, key); | |
1386 | break; | |
96b82f6d YY |
1387 | |
1388 | case OVS_ACTION_ATTR_PUSH_NSH: { | |
1389 | u8 buffer[NSH_HDR_MAX_LEN]; | |
1390 | struct nshhdr *nh = (struct nshhdr *)buffer; | |
1391 | ||
1392 | err = nsh_hdr_from_nlattr(nla_data(a), nh, | |
1393 | NSH_HDR_MAX_LEN); | |
1394 | if (unlikely(err)) | |
1395 | break; | |
1396 | err = push_nsh(skb, key, nh); | |
1397 | break; | |
1398 | } | |
1399 | ||
1400 | case OVS_ACTION_ATTR_POP_NSH: | |
1401 | err = pop_nsh(skb, key); | |
1402 | break; | |
e02b6f81 AZ |
1403 | |
1404 | case OVS_ACTION_ATTR_METER: | |
1405 | if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) { | |
1406 | consume_skb(skb); | |
1407 | return 0; | |
1408 | } | |
5a77cf96 YS |
1409 | break; |
1410 | ||
1411 | case OVS_ACTION_ATTR_CLONE: { | |
1412 | bool last = nla_is_last(a, rem); | |
1413 | ||
1414 | err = clone(dp, skb, key, a, last); | |
1415 | if (last) | |
1416 | return err; | |
1417 | break; | |
1418 | } | |
faa3beb4 NS |
1419 | |
1420 | case OVS_ACTION_ATTR_CHECK_PKT_LEN: { | |
1421 | bool last = nla_is_last(a, rem); | |
1422 | ||
1423 | err = execute_check_pkt_len(dp, skb, key, a, last); | |
1424 | if (last) | |
1425 | return err; | |
1426 | ||
1427 | break; | |
1428 | } | |
6ff686f2 | 1429 | } |
15c39847 | 1430 | |
10db8b20 JG |
1431 | if (unlikely(err)) { |
1432 | kfree_skb(skb); | |
1433 | return err; | |
1434 | } | |
064af421 | 1435 | } |
6c222e55 | 1436 | |
2b6a82da | 1437 | consume_skb(skb); |
a5225dd6 | 1438 | return 0; |
064af421 | 1439 | } |
871dfe07 | 1440 | |
d4004f8d AZ |
1441 | /* Execute the actions on the clone of the packet. The effect of the |
1442 | * execution does not affect the original 'skb' nor the original 'key'. | |
1443 | * | |
1444 | * The execution may be deferred in case the actions can not be executed | |
1445 | * immediately. | |
1446 | */ | |
1447 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, | |
1448 | struct sw_flow_key *key, u32 recirc_id, | |
1449 | const struct nlattr *actions, int len, | |
1450 | bool last, bool clone_flow_key) | |
1451 | { | |
1452 | struct deferred_action *da; | |
1453 | struct sw_flow_key *clone; | |
1454 | ||
1455 | skb = last ? skb : skb_clone(skb, GFP_ATOMIC); | |
1456 | if (!skb) { | |
1457 | /* Out of memory, skip this action. | |
1458 | */ | |
1459 | return 0; | |
1460 | } | |
1461 | ||
1462 | /* When clone_flow_key is false, the 'key' will not be change | |
1463 | * by the actions, then the 'key' can be used directly. | |
1464 | * Otherwise, try to clone key from the next recursion level of | |
1465 | * 'flow_keys'. If clone is successful, execute the actions | |
1466 | * without deferring. | |
1467 | */ | |
1468 | clone = clone_flow_key ? clone_key(key) : key; | |
1469 | if (clone) { | |
1470 | int err = 0; | |
1471 | ||
1472 | if (actions) { /* Sample action */ | |
1473 | if (clone_flow_key) | |
1474 | __this_cpu_inc(exec_actions_level); | |
1475 | ||
1476 | err = do_execute_actions(dp, skb, clone, | |
1477 | actions, len); | |
1478 | ||
1479 | if (clone_flow_key) | |
1480 | __this_cpu_dec(exec_actions_level); | |
1481 | } else { /* Recirc action */ | |
1482 | clone->recirc_id = recirc_id; | |
1483 | ovs_dp_process_packet(skb, clone); | |
1484 | } | |
1485 | return err; | |
1486 | } | |
1487 | ||
1488 | /* Out of 'flow_keys' space. Defer actions */ | |
1489 | da = add_deferred_actions(skb, key, actions, len); | |
1490 | if (da) { | |
1491 | if (!actions) { /* Recirc action */ | |
1492 | key = &da->pkt_key; | |
1493 | key->recirc_id = recirc_id; | |
1494 | } | |
1495 | } else { | |
1496 | /* Out of per CPU action FIFO space. Drop the 'skb' and | |
1497 | * log an error. | |
1498 | */ | |
1499 | kfree_skb(skb); | |
1500 | ||
1501 | if (net_ratelimit()) { | |
1502 | if (actions) { /* Sample action */ | |
1503 | pr_warn("%s: deferred action limit reached, drop sample action\n", | |
1504 | ovs_dp_name(dp)); | |
1505 | } else { /* Recirc action */ | |
1506 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
1507 | ovs_dp_name(dp)); | |
1508 | } | |
1509 | } | |
1510 | } | |
1511 | return 0; | |
1512 | } | |
1513 | ||
2c8c4fb7 AZ |
1514 | static void process_deferred_actions(struct datapath *dp) |
1515 | { | |
1516 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
1517 | ||
1518 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
1519 | if (action_fifo_is_empty(fifo)) | |
1520 | return; | |
1521 | ||
1522 | /* Finishing executing all deferred actions. */ | |
1523 | do { | |
1524 | struct deferred_action *da = action_fifo_get(fifo); | |
1525 | struct sk_buff *skb = da->skb; | |
7d16c847 | 1526 | struct sw_flow_key *key = &da->pkt_key; |
2c8c4fb7 | 1527 | const struct nlattr *actions = da->actions; |
615fa7ba | 1528 | int actions_len = da->actions_len; |
2c8c4fb7 AZ |
1529 | |
1530 | if (actions) | |
615fa7ba | 1531 | do_execute_actions(dp, skb, key, actions, actions_len); |
2c8c4fb7 | 1532 | else |
7d16c847 | 1533 | ovs_dp_process_packet(skb, key); |
2c8c4fb7 AZ |
1534 | } while (!action_fifo_is_empty(fifo)); |
1535 | ||
1536 | /* Reset FIFO for the next packet. */ | |
1537 | action_fifo_init(fifo); | |
1538 | } | |
1539 | ||
871dfe07 | 1540 | /* Execute a list of actions against 'skb'. */ |
2c8c4fb7 | 1541 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
7d16c847 PS |
1542 | const struct sw_flow_actions *acts, |
1543 | struct sw_flow_key *key) | |
2c8c4fb7 | 1544 | { |
77a9a338 | 1545 | int err, level; |
2c8c4fb7 | 1546 | |
77a9a338 | 1547 | level = __this_cpu_inc_return(exec_actions_level); |
615539ab | 1548 | if (unlikely(level > OVS_RECURSION_LIMIT)) { |
77a9a338 PS |
1549 | net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n", |
1550 | ovs_dp_name(dp)); | |
2c8c4fb7 | 1551 | kfree_skb(skb); |
77a9a338 PS |
1552 | err = -ENETDOWN; |
1553 | goto out; | |
2c8c4fb7 AZ |
1554 | } |
1555 | ||
6b330a60 | 1556 | OVS_CB(skb)->acts_origlen = acts->orig_len; |
7d16c847 PS |
1557 | err = do_execute_actions(dp, skb, key, |
1558 | acts->actions, acts->actions_len); | |
2c8c4fb7 | 1559 | |
77a9a338 | 1560 | if (level == 1) |
2c8c4fb7 AZ |
1561 | process_deferred_actions(dp); |
1562 | ||
77a9a338 PS |
1563 | out: |
1564 | __this_cpu_dec(exec_actions_level); | |
2c8c4fb7 AZ |
1565 | return err; |
1566 | } | |
1567 | ||
1568 | int action_fifos_init(void) | |
1569 | { | |
1570 | action_fifos = alloc_percpu(struct action_fifo); | |
1571 | if (!action_fifos) | |
1572 | return -ENOMEM; | |
1573 | ||
58afdef1 AZ |
1574 | flow_keys = alloc_percpu(struct action_flow_keys); |
1575 | if (!flow_keys) { | |
615539ab LR |
1576 | free_percpu(action_fifos); |
1577 | return -ENOMEM; | |
1578 | } | |
1579 | ||
2c8c4fb7 AZ |
1580 | return 0; |
1581 | } | |
1582 | ||
1583 | void action_fifos_exit(void) | |
60759b2b | 1584 | { |
2c8c4fb7 | 1585 | free_percpu(action_fifos); |
58afdef1 | 1586 | free_percpu(flow_keys); |
871dfe07 | 1587 | } |