Commit | Line | Data |
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ccb1352e | 1 | /* |
971427f3 | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
ccb1352e JG |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/skbuff.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/ip.h> | |
24 | #include <linux/openvswitch.h> | |
7f8a436e | 25 | #include <linux/netfilter_ipv6.h> |
a175a723 | 26 | #include <linux/sctp.h> |
ccb1352e JG |
27 | #include <linux/tcp.h> |
28 | #include <linux/udp.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/if_vlan.h> | |
25cd9ba0 | 32 | |
7f8a436e | 33 | #include <net/dst.h> |
ccb1352e | 34 | #include <net/ip.h> |
3fdbd1ce | 35 | #include <net/ipv6.h> |
7b85b4df | 36 | #include <net/ip6_fib.h> |
ccb1352e JG |
37 | #include <net/checksum.h> |
38 | #include <net/dsfield.h> | |
25cd9ba0 | 39 | #include <net/mpls.h> |
a175a723 | 40 | #include <net/sctp/checksum.h> |
ccb1352e JG |
41 | |
42 | #include "datapath.h" | |
971427f3 | 43 | #include "flow.h" |
7f8a436e | 44 | #include "conntrack.h" |
ccb1352e JG |
45 | #include "vport.h" |
46 | ||
47 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 48 | struct sw_flow_key *key, |
651887b0 | 49 | const struct nlattr *attr, int len); |
ccb1352e | 50 | |
971427f3 AZ |
51 | struct deferred_action { |
52 | struct sk_buff *skb; | |
53 | const struct nlattr *actions; | |
54 | ||
55 | /* Store pkt_key clone when creating deferred action. */ | |
56 | struct sw_flow_key pkt_key; | |
57 | }; | |
58 | ||
7f8a436e JS |
59 | #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN) |
60 | struct ovs_frag_data { | |
61 | unsigned long dst; | |
62 | struct vport *vport; | |
63 | struct ovs_skb_cb cb; | |
64 | __be16 inner_protocol; | |
65 | __u16 vlan_tci; | |
66 | __be16 vlan_proto; | |
67 | unsigned int l2_len; | |
68 | u8 l2_data[MAX_L2_LEN]; | |
69 | }; | |
70 | ||
71 | static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage); | |
72 | ||
971427f3 AZ |
73 | #define DEFERRED_ACTION_FIFO_SIZE 10 |
74 | struct action_fifo { | |
75 | int head; | |
76 | int tail; | |
77 | /* Deferred action fifo queue storage. */ | |
78 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; | |
79 | }; | |
80 | ||
81 | static struct action_fifo __percpu *action_fifos; | |
82 | static DEFINE_PER_CPU(int, exec_actions_level); | |
83 | ||
84 | static void action_fifo_init(struct action_fifo *fifo) | |
85 | { | |
86 | fifo->head = 0; | |
87 | fifo->tail = 0; | |
88 | } | |
89 | ||
12eb18f7 | 90 | static bool action_fifo_is_empty(const struct action_fifo *fifo) |
971427f3 AZ |
91 | { |
92 | return (fifo->head == fifo->tail); | |
93 | } | |
94 | ||
95 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) | |
96 | { | |
97 | if (action_fifo_is_empty(fifo)) | |
98 | return NULL; | |
99 | ||
100 | return &fifo->fifo[fifo->tail++]; | |
101 | } | |
102 | ||
103 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) | |
104 | { | |
105 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) | |
106 | return NULL; | |
107 | ||
108 | return &fifo->fifo[fifo->head++]; | |
109 | } | |
110 | ||
111 | /* Return true if fifo is not full */ | |
112 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, | |
12eb18f7 | 113 | const struct sw_flow_key *key, |
971427f3 AZ |
114 | const struct nlattr *attr) |
115 | { | |
116 | struct action_fifo *fifo; | |
117 | struct deferred_action *da; | |
118 | ||
119 | fifo = this_cpu_ptr(action_fifos); | |
120 | da = action_fifo_put(fifo); | |
121 | if (da) { | |
122 | da->skb = skb; | |
123 | da->actions = attr; | |
124 | da->pkt_key = *key; | |
125 | } | |
126 | ||
127 | return da; | |
128 | } | |
129 | ||
fff06c36 PS |
130 | static void invalidate_flow_key(struct sw_flow_key *key) |
131 | { | |
132 | key->eth.type = htons(0); | |
133 | } | |
134 | ||
135 | static bool is_flow_key_valid(const struct sw_flow_key *key) | |
136 | { | |
137 | return !!key->eth.type; | |
138 | } | |
139 | ||
bc7cc599 SH |
140 | static void update_ethertype(struct sk_buff *skb, struct ethhdr *hdr, |
141 | __be16 ethertype) | |
142 | { | |
143 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
144 | __be16 diff[] = { ~(hdr->h_proto), ethertype }; | |
145 | ||
146 | skb->csum = ~csum_partial((char *)diff, sizeof(diff), | |
147 | ~skb->csum); | |
148 | } | |
149 | ||
150 | hdr->h_proto = ethertype; | |
151 | } | |
152 | ||
fff06c36 | 153 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
25cd9ba0 SH |
154 | const struct ovs_action_push_mpls *mpls) |
155 | { | |
156 | __be32 *new_mpls_lse; | |
25cd9ba0 SH |
157 | |
158 | /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */ | |
159 | if (skb->encapsulation) | |
160 | return -ENOTSUPP; | |
161 | ||
162 | if (skb_cow_head(skb, MPLS_HLEN) < 0) | |
163 | return -ENOMEM; | |
164 | ||
48d2ab60 DA |
165 | if (!skb->inner_protocol) { |
166 | skb_set_inner_network_header(skb, skb->mac_len); | |
167 | skb_set_inner_protocol(skb, skb->protocol); | |
168 | } | |
169 | ||
25cd9ba0 SH |
170 | skb_push(skb, MPLS_HLEN); |
171 | memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb), | |
172 | skb->mac_len); | |
173 | skb_reset_mac_header(skb); | |
48d2ab60 | 174 | skb_set_network_header(skb, skb->mac_len); |
25cd9ba0 SH |
175 | |
176 | new_mpls_lse = (__be32 *)skb_mpls_header(skb); | |
177 | *new_mpls_lse = mpls->mpls_lse; | |
178 | ||
6b83d28a | 179 | skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN); |
25cd9ba0 | 180 | |
bc7cc599 | 181 | update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype); |
25cd9ba0 SH |
182 | skb->protocol = mpls->mpls_ethertype; |
183 | ||
fff06c36 | 184 | invalidate_flow_key(key); |
25cd9ba0 SH |
185 | return 0; |
186 | } | |
187 | ||
fff06c36 PS |
188 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
189 | const __be16 ethertype) | |
25cd9ba0 SH |
190 | { |
191 | struct ethhdr *hdr; | |
192 | int err; | |
193 | ||
e2195121 | 194 | err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); |
25cd9ba0 SH |
195 | if (unlikely(err)) |
196 | return err; | |
197 | ||
1abcd82c | 198 | skb_postpull_rcsum(skb, skb_mpls_header(skb), MPLS_HLEN); |
25cd9ba0 SH |
199 | |
200 | memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), | |
201 | skb->mac_len); | |
202 | ||
203 | __skb_pull(skb, MPLS_HLEN); | |
204 | skb_reset_mac_header(skb); | |
48d2ab60 | 205 | skb_set_network_header(skb, skb->mac_len); |
25cd9ba0 SH |
206 | |
207 | /* skb_mpls_header() is used to locate the ethertype | |
208 | * field correctly in the presence of VLAN tags. | |
209 | */ | |
210 | hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN); | |
bc7cc599 | 211 | update_ethertype(skb, hdr, ethertype); |
25cd9ba0 SH |
212 | if (eth_p_mpls(skb->protocol)) |
213 | skb->protocol = ethertype; | |
fff06c36 PS |
214 | |
215 | invalidate_flow_key(key); | |
25cd9ba0 SH |
216 | return 0; |
217 | } | |
218 | ||
83d2b9ba JR |
219 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key, |
220 | const __be32 *mpls_lse, const __be32 *mask) | |
25cd9ba0 SH |
221 | { |
222 | __be32 *stack; | |
83d2b9ba | 223 | __be32 lse; |
25cd9ba0 SH |
224 | int err; |
225 | ||
e2195121 | 226 | err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN); |
25cd9ba0 SH |
227 | if (unlikely(err)) |
228 | return err; | |
229 | ||
230 | stack = (__be32 *)skb_mpls_header(skb); | |
be26b9a8 | 231 | lse = OVS_MASKED(*stack, *mpls_lse, *mask); |
25cd9ba0 | 232 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
83d2b9ba JR |
233 | __be32 diff[] = { ~(*stack), lse }; |
234 | ||
25cd9ba0 SH |
235 | skb->csum = ~csum_partial((char *)diff, sizeof(diff), |
236 | ~skb->csum); | |
237 | } | |
238 | ||
83d2b9ba JR |
239 | *stack = lse; |
240 | flow_key->mpls.top_lse = lse; | |
25cd9ba0 SH |
241 | return 0; |
242 | } | |
243 | ||
fff06c36 | 244 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
ccb1352e | 245 | { |
ccb1352e JG |
246 | int err; |
247 | ||
93515d53 | 248 | err = skb_vlan_pop(skb); |
018c1dda | 249 | if (skb_vlan_tag_present(skb)) { |
93515d53 | 250 | invalidate_flow_key(key); |
018c1dda EG |
251 | } else { |
252 | key->eth.vlan.tci = 0; | |
253 | key->eth.vlan.tpid = 0; | |
254 | } | |
93515d53 | 255 | return err; |
ccb1352e JG |
256 | } |
257 | ||
fff06c36 PS |
258 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
259 | const struct ovs_action_push_vlan *vlan) | |
ccb1352e | 260 | { |
018c1dda | 261 | if (skb_vlan_tag_present(skb)) { |
fff06c36 | 262 | invalidate_flow_key(key); |
018c1dda EG |
263 | } else { |
264 | key->eth.vlan.tci = vlan->vlan_tci; | |
265 | key->eth.vlan.tpid = vlan->vlan_tpid; | |
266 | } | |
93515d53 JP |
267 | return skb_vlan_push(skb, vlan->vlan_tpid, |
268 | ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); | |
ccb1352e JG |
269 | } |
270 | ||
83d2b9ba JR |
271 | /* 'src' is already properly masked. */ |
272 | static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_) | |
273 | { | |
274 | u16 *dst = (u16 *)dst_; | |
275 | const u16 *src = (const u16 *)src_; | |
276 | const u16 *mask = (const u16 *)mask_; | |
277 | ||
be26b9a8 JS |
278 | OVS_SET_MASKED(dst[0], src[0], mask[0]); |
279 | OVS_SET_MASKED(dst[1], src[1], mask[1]); | |
280 | OVS_SET_MASKED(dst[2], src[2], mask[2]); | |
83d2b9ba JR |
281 | } |
282 | ||
283 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
284 | const struct ovs_key_ethernet *key, | |
285 | const struct ovs_key_ethernet *mask) | |
ccb1352e JG |
286 | { |
287 | int err; | |
83d2b9ba | 288 | |
e2195121 | 289 | err = skb_ensure_writable(skb, ETH_HLEN); |
ccb1352e JG |
290 | if (unlikely(err)) |
291 | return err; | |
292 | ||
b34df5e8 PS |
293 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
294 | ||
83d2b9ba JR |
295 | ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src, |
296 | mask->eth_src); | |
297 | ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst, | |
298 | mask->eth_dst); | |
ccb1352e | 299 | |
6b83d28a | 300 | skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
b34df5e8 | 301 | |
83d2b9ba JR |
302 | ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source); |
303 | ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest); | |
ccb1352e JG |
304 | return 0; |
305 | } | |
306 | ||
3576fd79 GG |
307 | static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh, |
308 | __be32 addr, __be32 new_addr) | |
ccb1352e JG |
309 | { |
310 | int transport_len = skb->len - skb_transport_offset(skb); | |
311 | ||
3576fd79 GG |
312 | if (nh->frag_off & htons(IP_OFFSET)) |
313 | return; | |
314 | ||
ccb1352e JG |
315 | if (nh->protocol == IPPROTO_TCP) { |
316 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
317 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, | |
4b048d6d | 318 | addr, new_addr, true); |
ccb1352e | 319 | } else if (nh->protocol == IPPROTO_UDP) { |
81e5d41d JG |
320 | if (likely(transport_len >= sizeof(struct udphdr))) { |
321 | struct udphdr *uh = udp_hdr(skb); | |
322 | ||
323 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
324 | inet_proto_csum_replace4(&uh->check, skb, | |
4b048d6d | 325 | addr, new_addr, true); |
81e5d41d JG |
326 | if (!uh->check) |
327 | uh->check = CSUM_MANGLED_0; | |
328 | } | |
329 | } | |
ccb1352e | 330 | } |
3576fd79 | 331 | } |
ccb1352e | 332 | |
3576fd79 GG |
333 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
334 | __be32 *addr, __be32 new_addr) | |
335 | { | |
336 | update_ip_l4_checksum(skb, nh, *addr, new_addr); | |
ccb1352e | 337 | csum_replace4(&nh->check, *addr, new_addr); |
7539fadc | 338 | skb_clear_hash(skb); |
ccb1352e JG |
339 | *addr = new_addr; |
340 | } | |
341 | ||
3fdbd1ce AA |
342 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
343 | __be32 addr[4], const __be32 new_addr[4]) | |
344 | { | |
345 | int transport_len = skb->len - skb_transport_offset(skb); | |
346 | ||
856447d0 | 347 | if (l4_proto == NEXTHDR_TCP) { |
3fdbd1ce AA |
348 | if (likely(transport_len >= sizeof(struct tcphdr))) |
349 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
4b048d6d | 350 | addr, new_addr, true); |
856447d0 | 351 | } else if (l4_proto == NEXTHDR_UDP) { |
3fdbd1ce AA |
352 | if (likely(transport_len >= sizeof(struct udphdr))) { |
353 | struct udphdr *uh = udp_hdr(skb); | |
354 | ||
355 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
356 | inet_proto_csum_replace16(&uh->check, skb, | |
4b048d6d | 357 | addr, new_addr, true); |
3fdbd1ce AA |
358 | if (!uh->check) |
359 | uh->check = CSUM_MANGLED_0; | |
360 | } | |
361 | } | |
856447d0 JG |
362 | } else if (l4_proto == NEXTHDR_ICMP) { |
363 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
364 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
4b048d6d | 365 | skb, addr, new_addr, true); |
3fdbd1ce AA |
366 | } |
367 | } | |
368 | ||
83d2b9ba JR |
369 | static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4], |
370 | const __be32 mask[4], __be32 masked[4]) | |
371 | { | |
be26b9a8 JS |
372 | masked[0] = OVS_MASKED(old[0], addr[0], mask[0]); |
373 | masked[1] = OVS_MASKED(old[1], addr[1], mask[1]); | |
374 | masked[2] = OVS_MASKED(old[2], addr[2], mask[2]); | |
375 | masked[3] = OVS_MASKED(old[3], addr[3], mask[3]); | |
83d2b9ba JR |
376 | } |
377 | ||
3fdbd1ce AA |
378 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, |
379 | __be32 addr[4], const __be32 new_addr[4], | |
380 | bool recalculate_csum) | |
381 | { | |
382 | if (recalculate_csum) | |
383 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); | |
384 | ||
7539fadc | 385 | skb_clear_hash(skb); |
3fdbd1ce AA |
386 | memcpy(addr, new_addr, sizeof(__be32[4])); |
387 | } | |
388 | ||
83d2b9ba | 389 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask) |
3fdbd1ce | 390 | { |
83d2b9ba | 391 | /* Bits 21-24 are always unmasked, so this retains their values. */ |
be26b9a8 JS |
392 | OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16)); |
393 | OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8)); | |
394 | OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask); | |
3fdbd1ce AA |
395 | } |
396 | ||
83d2b9ba JR |
397 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl, |
398 | u8 mask) | |
3fdbd1ce | 399 | { |
be26b9a8 | 400 | new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask); |
3fdbd1ce | 401 | |
ccb1352e JG |
402 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); |
403 | nh->ttl = new_ttl; | |
404 | } | |
405 | ||
83d2b9ba JR |
406 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key, |
407 | const struct ovs_key_ipv4 *key, | |
408 | const struct ovs_key_ipv4 *mask) | |
ccb1352e JG |
409 | { |
410 | struct iphdr *nh; | |
83d2b9ba | 411 | __be32 new_addr; |
ccb1352e JG |
412 | int err; |
413 | ||
e2195121 JP |
414 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
415 | sizeof(struct iphdr)); | |
ccb1352e JG |
416 | if (unlikely(err)) |
417 | return err; | |
418 | ||
419 | nh = ip_hdr(skb); | |
420 | ||
83d2b9ba JR |
421 | /* Setting an IP addresses is typically only a side effect of |
422 | * matching on them in the current userspace implementation, so it | |
423 | * makes sense to check if the value actually changed. | |
424 | */ | |
425 | if (mask->ipv4_src) { | |
be26b9a8 | 426 | new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src); |
ccb1352e | 427 | |
83d2b9ba JR |
428 | if (unlikely(new_addr != nh->saddr)) { |
429 | set_ip_addr(skb, nh, &nh->saddr, new_addr); | |
430 | flow_key->ipv4.addr.src = new_addr; | |
431 | } | |
fff06c36 | 432 | } |
83d2b9ba | 433 | if (mask->ipv4_dst) { |
be26b9a8 | 434 | new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst); |
ccb1352e | 435 | |
83d2b9ba JR |
436 | if (unlikely(new_addr != nh->daddr)) { |
437 | set_ip_addr(skb, nh, &nh->daddr, new_addr); | |
438 | flow_key->ipv4.addr.dst = new_addr; | |
439 | } | |
fff06c36 | 440 | } |
83d2b9ba JR |
441 | if (mask->ipv4_tos) { |
442 | ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos); | |
443 | flow_key->ip.tos = nh->tos; | |
444 | } | |
445 | if (mask->ipv4_ttl) { | |
446 | set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl); | |
447 | flow_key->ip.ttl = nh->ttl; | |
fff06c36 | 448 | } |
ccb1352e JG |
449 | |
450 | return 0; | |
451 | } | |
452 | ||
83d2b9ba JR |
453 | static bool is_ipv6_mask_nonzero(const __be32 addr[4]) |
454 | { | |
455 | return !!(addr[0] | addr[1] | addr[2] | addr[3]); | |
456 | } | |
457 | ||
458 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key, | |
459 | const struct ovs_key_ipv6 *key, | |
460 | const struct ovs_key_ipv6 *mask) | |
3fdbd1ce AA |
461 | { |
462 | struct ipv6hdr *nh; | |
463 | int err; | |
3fdbd1ce | 464 | |
e2195121 JP |
465 | err = skb_ensure_writable(skb, skb_network_offset(skb) + |
466 | sizeof(struct ipv6hdr)); | |
3fdbd1ce AA |
467 | if (unlikely(err)) |
468 | return err; | |
469 | ||
470 | nh = ipv6_hdr(skb); | |
3fdbd1ce | 471 | |
83d2b9ba JR |
472 | /* Setting an IP addresses is typically only a side effect of |
473 | * matching on them in the current userspace implementation, so it | |
474 | * makes sense to check if the value actually changed. | |
475 | */ | |
476 | if (is_ipv6_mask_nonzero(mask->ipv6_src)) { | |
477 | __be32 *saddr = (__be32 *)&nh->saddr; | |
478 | __be32 masked[4]; | |
479 | ||
480 | mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked); | |
481 | ||
482 | if (unlikely(memcmp(saddr, masked, sizeof(masked)))) { | |
b4f70527 | 483 | set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked, |
83d2b9ba JR |
484 | true); |
485 | memcpy(&flow_key->ipv6.addr.src, masked, | |
486 | sizeof(flow_key->ipv6.addr.src)); | |
487 | } | |
488 | } | |
489 | if (is_ipv6_mask_nonzero(mask->ipv6_dst)) { | |
3fdbd1ce AA |
490 | unsigned int offset = 0; |
491 | int flags = IP6_FH_F_SKIP_RH; | |
492 | bool recalc_csum = true; | |
83d2b9ba JR |
493 | __be32 *daddr = (__be32 *)&nh->daddr; |
494 | __be32 masked[4]; | |
495 | ||
496 | mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked); | |
497 | ||
498 | if (unlikely(memcmp(daddr, masked, sizeof(masked)))) { | |
499 | if (ipv6_ext_hdr(nh->nexthdr)) | |
500 | recalc_csum = (ipv6_find_hdr(skb, &offset, | |
501 | NEXTHDR_ROUTING, | |
502 | NULL, &flags) | |
503 | != NEXTHDR_ROUTING); | |
504 | ||
b4f70527 | 505 | set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked, |
83d2b9ba JR |
506 | recalc_csum); |
507 | memcpy(&flow_key->ipv6.addr.dst, masked, | |
508 | sizeof(flow_key->ipv6.addr.dst)); | |
509 | } | |
510 | } | |
511 | if (mask->ipv6_tclass) { | |
512 | ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass); | |
513 | flow_key->ip.tos = ipv6_get_dsfield(nh); | |
514 | } | |
515 | if (mask->ipv6_label) { | |
516 | set_ipv6_fl(nh, ntohl(key->ipv6_label), | |
517 | ntohl(mask->ipv6_label)); | |
518 | flow_key->ipv6.label = | |
519 | *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); | |
520 | } | |
521 | if (mask->ipv6_hlimit) { | |
be26b9a8 JS |
522 | OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit, |
523 | mask->ipv6_hlimit); | |
83d2b9ba | 524 | flow_key->ip.ttl = nh->hop_limit; |
3fdbd1ce | 525 | } |
3fdbd1ce AA |
526 | return 0; |
527 | } | |
528 | ||
e2195121 | 529 | /* Must follow skb_ensure_writable() since that can move the skb data. */ |
ccb1352e | 530 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
83d2b9ba | 531 | __be16 new_port, __sum16 *check) |
ccb1352e | 532 | { |
4b048d6d | 533 | inet_proto_csum_replace2(check, skb, *port, new_port, false); |
ccb1352e | 534 | *port = new_port; |
81e5d41d JG |
535 | } |
536 | ||
83d2b9ba JR |
537 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
538 | const struct ovs_key_udp *key, | |
539 | const struct ovs_key_udp *mask) | |
ccb1352e JG |
540 | { |
541 | struct udphdr *uh; | |
83d2b9ba | 542 | __be16 src, dst; |
ccb1352e JG |
543 | int err; |
544 | ||
e2195121 JP |
545 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
546 | sizeof(struct udphdr)); | |
ccb1352e JG |
547 | if (unlikely(err)) |
548 | return err; | |
549 | ||
550 | uh = udp_hdr(skb); | |
83d2b9ba | 551 | /* Either of the masks is non-zero, so do not bother checking them. */ |
be26b9a8 JS |
552 | src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src); |
553 | dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst); | |
ccb1352e | 554 | |
83d2b9ba JR |
555 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
556 | if (likely(src != uh->source)) { | |
557 | set_tp_port(skb, &uh->source, src, &uh->check); | |
558 | flow_key->tp.src = src; | |
559 | } | |
560 | if (likely(dst != uh->dest)) { | |
561 | set_tp_port(skb, &uh->dest, dst, &uh->check); | |
562 | flow_key->tp.dst = dst; | |
563 | } | |
564 | ||
565 | if (unlikely(!uh->check)) | |
566 | uh->check = CSUM_MANGLED_0; | |
567 | } else { | |
568 | uh->source = src; | |
569 | uh->dest = dst; | |
570 | flow_key->tp.src = src; | |
571 | flow_key->tp.dst = dst; | |
fff06c36 | 572 | } |
ccb1352e | 573 | |
83d2b9ba JR |
574 | skb_clear_hash(skb); |
575 | ||
ccb1352e JG |
576 | return 0; |
577 | } | |
578 | ||
83d2b9ba JR |
579 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
580 | const struct ovs_key_tcp *key, | |
581 | const struct ovs_key_tcp *mask) | |
ccb1352e JG |
582 | { |
583 | struct tcphdr *th; | |
83d2b9ba | 584 | __be16 src, dst; |
ccb1352e JG |
585 | int err; |
586 | ||
e2195121 JP |
587 | err = skb_ensure_writable(skb, skb_transport_offset(skb) + |
588 | sizeof(struct tcphdr)); | |
ccb1352e JG |
589 | if (unlikely(err)) |
590 | return err; | |
591 | ||
592 | th = tcp_hdr(skb); | |
be26b9a8 | 593 | src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src); |
83d2b9ba JR |
594 | if (likely(src != th->source)) { |
595 | set_tp_port(skb, &th->source, src, &th->check); | |
596 | flow_key->tp.src = src; | |
fff06c36 | 597 | } |
be26b9a8 | 598 | dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst); |
83d2b9ba JR |
599 | if (likely(dst != th->dest)) { |
600 | set_tp_port(skb, &th->dest, dst, &th->check); | |
601 | flow_key->tp.dst = dst; | |
fff06c36 | 602 | } |
83d2b9ba | 603 | skb_clear_hash(skb); |
ccb1352e JG |
604 | |
605 | return 0; | |
606 | } | |
607 | ||
83d2b9ba JR |
608 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
609 | const struct ovs_key_sctp *key, | |
610 | const struct ovs_key_sctp *mask) | |
a175a723 | 611 | { |
83d2b9ba | 612 | unsigned int sctphoff = skb_transport_offset(skb); |
a175a723 | 613 | struct sctphdr *sh; |
83d2b9ba | 614 | __le32 old_correct_csum, new_csum, old_csum; |
a175a723 | 615 | int err; |
a175a723 | 616 | |
e2195121 | 617 | err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr)); |
a175a723 JS |
618 | if (unlikely(err)) |
619 | return err; | |
620 | ||
621 | sh = sctp_hdr(skb); | |
83d2b9ba JR |
622 | old_csum = sh->checksum; |
623 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
a175a723 | 624 | |
be26b9a8 JS |
625 | sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src); |
626 | sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst); | |
a175a723 | 627 | |
83d2b9ba | 628 | new_csum = sctp_compute_cksum(skb, sctphoff); |
a175a723 | 629 | |
83d2b9ba JR |
630 | /* Carry any checksum errors through. */ |
631 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
a175a723 | 632 | |
83d2b9ba JR |
633 | skb_clear_hash(skb); |
634 | flow_key->tp.src = sh->source; | |
635 | flow_key->tp.dst = sh->dest; | |
a175a723 JS |
636 | |
637 | return 0; | |
638 | } | |
639 | ||
188515fb | 640 | static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
7f8a436e JS |
641 | { |
642 | struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage); | |
643 | struct vport *vport = data->vport; | |
644 | ||
645 | if (skb_cow_head(skb, data->l2_len) < 0) { | |
646 | kfree_skb(skb); | |
647 | return -ENOMEM; | |
648 | } | |
649 | ||
650 | __skb_dst_copy(skb, data->dst); | |
651 | *OVS_CB(skb) = data->cb; | |
652 | skb->inner_protocol = data->inner_protocol; | |
653 | skb->vlan_tci = data->vlan_tci; | |
654 | skb->vlan_proto = data->vlan_proto; | |
655 | ||
656 | /* Reconstruct the MAC header. */ | |
657 | skb_push(skb, data->l2_len); | |
658 | memcpy(skb->data, &data->l2_data, data->l2_len); | |
6b83d28a | 659 | skb_postpush_rcsum(skb, skb->data, data->l2_len); |
7f8a436e JS |
660 | skb_reset_mac_header(skb); |
661 | ||
662 | ovs_vport_send(vport, skb); | |
663 | return 0; | |
664 | } | |
665 | ||
666 | static unsigned int | |
667 | ovs_dst_get_mtu(const struct dst_entry *dst) | |
668 | { | |
669 | return dst->dev->mtu; | |
670 | } | |
671 | ||
672 | static struct dst_ops ovs_dst_ops = { | |
673 | .family = AF_UNSPEC, | |
674 | .mtu = ovs_dst_get_mtu, | |
675 | }; | |
676 | ||
677 | /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is | |
678 | * ovs_vport_output(), which is called once per fragmented packet. | |
679 | */ | |
680 | static void prepare_frag(struct vport *vport, struct sk_buff *skb) | |
681 | { | |
682 | unsigned int hlen = skb_network_offset(skb); | |
683 | struct ovs_frag_data *data; | |
684 | ||
685 | data = this_cpu_ptr(&ovs_frag_data_storage); | |
686 | data->dst = skb->_skb_refdst; | |
687 | data->vport = vport; | |
688 | data->cb = *OVS_CB(skb); | |
689 | data->inner_protocol = skb->inner_protocol; | |
690 | data->vlan_tci = skb->vlan_tci; | |
691 | data->vlan_proto = skb->vlan_proto; | |
692 | data->l2_len = hlen; | |
693 | memcpy(&data->l2_data, skb->data, hlen); | |
694 | ||
695 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
696 | skb_pull(skb, hlen); | |
697 | } | |
698 | ||
c559cd3a EB |
699 | static void ovs_fragment(struct net *net, struct vport *vport, |
700 | struct sk_buff *skb, u16 mru, __be16 ethertype) | |
7f8a436e JS |
701 | { |
702 | if (skb_network_offset(skb) > MAX_L2_LEN) { | |
703 | OVS_NLERR(1, "L2 header too long to fragment"); | |
b8f22570 | 704 | goto err; |
7f8a436e JS |
705 | } |
706 | ||
707 | if (ethertype == htons(ETH_P_IP)) { | |
708 | struct dst_entry ovs_dst; | |
709 | unsigned long orig_dst; | |
710 | ||
711 | prepare_frag(vport, skb); | |
712 | dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1, | |
713 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
714 | ovs_dst.dev = vport->dev; | |
715 | ||
716 | orig_dst = skb->_skb_refdst; | |
717 | skb_dst_set_noref(skb, &ovs_dst); | |
718 | IPCB(skb)->frag_max_size = mru; | |
719 | ||
694869b3 | 720 | ip_do_fragment(net, skb->sk, skb, ovs_vport_output); |
7f8a436e JS |
721 | refdst_drop(orig_dst); |
722 | } else if (ethertype == htons(ETH_P_IPV6)) { | |
723 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); | |
724 | unsigned long orig_dst; | |
725 | struct rt6_info ovs_rt; | |
726 | ||
727 | if (!v6ops) { | |
b8f22570 | 728 | goto err; |
7f8a436e JS |
729 | } |
730 | ||
731 | prepare_frag(vport, skb); | |
732 | memset(&ovs_rt, 0, sizeof(ovs_rt)); | |
733 | dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1, | |
734 | DST_OBSOLETE_NONE, DST_NOCOUNT); | |
735 | ovs_rt.dst.dev = vport->dev; | |
736 | ||
737 | orig_dst = skb->_skb_refdst; | |
738 | skb_dst_set_noref(skb, &ovs_rt.dst); | |
739 | IP6CB(skb)->frag_max_size = mru; | |
740 | ||
7d8c6e39 | 741 | v6ops->fragment(net, skb->sk, skb, ovs_vport_output); |
7f8a436e JS |
742 | refdst_drop(orig_dst); |
743 | } else { | |
744 | WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.", | |
745 | ovs_vport_name(vport), ntohs(ethertype), mru, | |
746 | vport->dev->mtu); | |
b8f22570 | 747 | goto err; |
7f8a436e | 748 | } |
b8f22570 JS |
749 | |
750 | return; | |
751 | err: | |
752 | kfree_skb(skb); | |
7f8a436e JS |
753 | } |
754 | ||
755 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port, | |
756 | struct sw_flow_key *key) | |
ccb1352e | 757 | { |
738967b8 | 758 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
ccb1352e | 759 | |
7f8a436e JS |
760 | if (likely(vport)) { |
761 | u16 mru = OVS_CB(skb)->mru; | |
f2a4d086 WT |
762 | u32 cutlen = OVS_CB(skb)->cutlen; |
763 | ||
764 | if (unlikely(cutlen > 0)) { | |
765 | if (skb->len - cutlen > ETH_HLEN) | |
766 | pskb_trim(skb, skb->len - cutlen); | |
767 | else | |
768 | pskb_trim(skb, ETH_HLEN); | |
769 | } | |
7f8a436e JS |
770 | |
771 | if (likely(!mru || (skb->len <= mru + ETH_HLEN))) { | |
772 | ovs_vport_send(vport, skb); | |
773 | } else if (mru <= vport->dev->mtu) { | |
c559cd3a | 774 | struct net *net = read_pnet(&dp->net); |
7f8a436e JS |
775 | __be16 ethertype = key->eth.type; |
776 | ||
777 | if (!is_flow_key_valid(key)) { | |
778 | if (eth_p_mpls(skb->protocol)) | |
779 | ethertype = skb->inner_protocol; | |
780 | else | |
781 | ethertype = vlan_get_protocol(skb); | |
782 | } | |
783 | ||
c559cd3a | 784 | ovs_fragment(net, vport, skb, mru, ethertype); |
7f8a436e JS |
785 | } else { |
786 | kfree_skb(skb); | |
787 | } | |
788 | } else { | |
ccb1352e | 789 | kfree_skb(skb); |
7f8a436e | 790 | } |
ccb1352e JG |
791 | } |
792 | ||
793 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, | |
ccea7445 | 794 | struct sw_flow_key *key, const struct nlattr *attr, |
f2a4d086 WT |
795 | const struct nlattr *actions, int actions_len, |
796 | uint32_t cutlen) | |
ccb1352e JG |
797 | { |
798 | struct dp_upcall_info upcall; | |
799 | const struct nlattr *a; | |
800 | int rem; | |
801 | ||
ccea7445 | 802 | memset(&upcall, 0, sizeof(upcall)); |
ccb1352e | 803 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
7f8a436e | 804 | upcall.mru = OVS_CB(skb)->mru; |
ccb1352e JG |
805 | |
806 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
807 | a = nla_next(a, &rem)) { | |
808 | switch (nla_type(a)) { | |
809 | case OVS_USERSPACE_ATTR_USERDATA: | |
810 | upcall.userdata = a; | |
811 | break; | |
812 | ||
813 | case OVS_USERSPACE_ATTR_PID: | |
15e47304 | 814 | upcall.portid = nla_get_u32(a); |
ccb1352e | 815 | break; |
8f0aad6f WZ |
816 | |
817 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
818 | /* Get out tunnel info. */ | |
819 | struct vport *vport; | |
820 | ||
821 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
822 | if (vport) { | |
823 | int err; | |
824 | ||
fc4099f1 PS |
825 | err = dev_fill_metadata_dst(vport->dev, skb); |
826 | if (!err) | |
827 | upcall.egress_tun_info = skb_tunnel_info(skb); | |
8f0aad6f | 828 | } |
4c222798 | 829 | |
8f0aad6f | 830 | break; |
ccb1352e | 831 | } |
8f0aad6f | 832 | |
ccea7445 NM |
833 | case OVS_USERSPACE_ATTR_ACTIONS: { |
834 | /* Include actions. */ | |
835 | upcall.actions = actions; | |
836 | upcall.actions_len = actions_len; | |
837 | break; | |
838 | } | |
839 | ||
8f0aad6f | 840 | } /* End of switch. */ |
ccb1352e JG |
841 | } |
842 | ||
f2a4d086 | 843 | return ovs_dp_upcall(dp, skb, key, &upcall, cutlen); |
ccb1352e JG |
844 | } |
845 | ||
846 | static int sample(struct datapath *dp, struct sk_buff *skb, | |
ccea7445 NM |
847 | struct sw_flow_key *key, const struct nlattr *attr, |
848 | const struct nlattr *actions, int actions_len) | |
ccb1352e JG |
849 | { |
850 | const struct nlattr *acts_list = NULL; | |
851 | const struct nlattr *a; | |
852 | int rem; | |
f2a4d086 | 853 | u32 cutlen = 0; |
ccb1352e JG |
854 | |
855 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
856 | a = nla_next(a, &rem)) { | |
e05176a3 WZ |
857 | u32 probability; |
858 | ||
ccb1352e JG |
859 | switch (nla_type(a)) { |
860 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
e05176a3 WZ |
861 | probability = nla_get_u32(a); |
862 | if (!probability || prandom_u32() > probability) | |
ccb1352e JG |
863 | return 0; |
864 | break; | |
865 | ||
866 | case OVS_SAMPLE_ATTR_ACTIONS: | |
867 | acts_list = a; | |
868 | break; | |
869 | } | |
870 | } | |
871 | ||
651887b0 SH |
872 | rem = nla_len(acts_list); |
873 | a = nla_data(acts_list); | |
874 | ||
32ae87ff AZ |
875 | /* Actions list is empty, do nothing */ |
876 | if (unlikely(!rem)) | |
877 | return 0; | |
651887b0 | 878 | |
32ae87ff | 879 | /* The only known usage of sample action is having a single user-space |
f2a4d086 | 880 | * action, or having a truncate action followed by a single user-space |
32ae87ff AZ |
881 | * action. Treat this usage as a special case. |
882 | * The output_userspace() should clone the skb to be sent to the | |
883 | * user space. This skb will be consumed by its caller. | |
651887b0 | 884 | */ |
f2a4d086 WT |
885 | if (unlikely(nla_type(a) == OVS_ACTION_ATTR_TRUNC)) { |
886 | struct ovs_action_trunc *trunc = nla_data(a); | |
887 | ||
888 | if (skb->len > trunc->max_len) | |
889 | cutlen = skb->len - trunc->max_len; | |
890 | ||
891 | a = nla_next(a, &rem); | |
892 | } | |
893 | ||
32ae87ff | 894 | if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE && |
941d8ebc | 895 | nla_is_last(a, rem))) |
f2a4d086 WT |
896 | return output_userspace(dp, skb, key, a, actions, |
897 | actions_len, cutlen); | |
32ae87ff AZ |
898 | |
899 | skb = skb_clone(skb, GFP_ATOMIC); | |
900 | if (!skb) | |
901 | /* Skip the sample action when out of memory. */ | |
902 | return 0; | |
903 | ||
971427f3 AZ |
904 | if (!add_deferred_actions(skb, key, a)) { |
905 | if (net_ratelimit()) | |
906 | pr_warn("%s: deferred actions limit reached, dropping sample action\n", | |
907 | ovs_dp_name(dp)); | |
908 | ||
909 | kfree_skb(skb); | |
910 | } | |
911 | return 0; | |
912 | } | |
913 | ||
914 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, | |
915 | const struct nlattr *attr) | |
916 | { | |
917 | struct ovs_action_hash *hash_act = nla_data(attr); | |
918 | u32 hash = 0; | |
919 | ||
920 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
921 | hash = skb_get_hash(skb); | |
922 | hash = jhash_1word(hash, hash_act->hash_basis); | |
923 | if (!hash) | |
924 | hash = 0x1; | |
925 | ||
926 | key->ovs_flow_hash = hash; | |
ccb1352e JG |
927 | } |
928 | ||
83d2b9ba JR |
929 | static int execute_set_action(struct sk_buff *skb, |
930 | struct sw_flow_key *flow_key, | |
931 | const struct nlattr *a) | |
932 | { | |
933 | /* Only tunnel set execution is supported without a mask. */ | |
934 | if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) { | |
34ae932a TG |
935 | struct ovs_tunnel_info *tun = nla_data(a); |
936 | ||
937 | skb_dst_drop(skb); | |
938 | dst_hold((struct dst_entry *)tun->tun_dst); | |
939 | skb_dst_set(skb, (struct dst_entry *)tun->tun_dst); | |
83d2b9ba JR |
940 | return 0; |
941 | } | |
942 | ||
943 | return -EINVAL; | |
944 | } | |
945 | ||
946 | /* Mask is at the midpoint of the data. */ | |
947 | #define get_mask(a, type) ((const type)nla_data(a) + 1) | |
948 | ||
949 | static int execute_masked_set_action(struct sk_buff *skb, | |
950 | struct sw_flow_key *flow_key, | |
951 | const struct nlattr *a) | |
ccb1352e JG |
952 | { |
953 | int err = 0; | |
954 | ||
83d2b9ba | 955 | switch (nla_type(a)) { |
ccb1352e | 956 | case OVS_KEY_ATTR_PRIORITY: |
be26b9a8 JS |
957 | OVS_SET_MASKED(skb->priority, nla_get_u32(a), |
958 | *get_mask(a, u32 *)); | |
83d2b9ba | 959 | flow_key->phy.priority = skb->priority; |
ccb1352e JG |
960 | break; |
961 | ||
39c7caeb | 962 | case OVS_KEY_ATTR_SKB_MARK: |
be26b9a8 | 963 | OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *)); |
83d2b9ba | 964 | flow_key->phy.skb_mark = skb->mark; |
39c7caeb AA |
965 | break; |
966 | ||
f0b128c1 | 967 | case OVS_KEY_ATTR_TUNNEL_INFO: |
83d2b9ba JR |
968 | /* Masked data not supported for tunnel. */ |
969 | err = -EINVAL; | |
7d5437c7 PS |
970 | break; |
971 | ||
ccb1352e | 972 | case OVS_KEY_ATTR_ETHERNET: |
83d2b9ba JR |
973 | err = set_eth_addr(skb, flow_key, nla_data(a), |
974 | get_mask(a, struct ovs_key_ethernet *)); | |
ccb1352e JG |
975 | break; |
976 | ||
977 | case OVS_KEY_ATTR_IPV4: | |
83d2b9ba JR |
978 | err = set_ipv4(skb, flow_key, nla_data(a), |
979 | get_mask(a, struct ovs_key_ipv4 *)); | |
ccb1352e JG |
980 | break; |
981 | ||
3fdbd1ce | 982 | case OVS_KEY_ATTR_IPV6: |
83d2b9ba JR |
983 | err = set_ipv6(skb, flow_key, nla_data(a), |
984 | get_mask(a, struct ovs_key_ipv6 *)); | |
3fdbd1ce AA |
985 | break; |
986 | ||
ccb1352e | 987 | case OVS_KEY_ATTR_TCP: |
83d2b9ba JR |
988 | err = set_tcp(skb, flow_key, nla_data(a), |
989 | get_mask(a, struct ovs_key_tcp *)); | |
ccb1352e JG |
990 | break; |
991 | ||
992 | case OVS_KEY_ATTR_UDP: | |
83d2b9ba JR |
993 | err = set_udp(skb, flow_key, nla_data(a), |
994 | get_mask(a, struct ovs_key_udp *)); | |
ccb1352e | 995 | break; |
a175a723 JS |
996 | |
997 | case OVS_KEY_ATTR_SCTP: | |
83d2b9ba JR |
998 | err = set_sctp(skb, flow_key, nla_data(a), |
999 | get_mask(a, struct ovs_key_sctp *)); | |
a175a723 | 1000 | break; |
25cd9ba0 SH |
1001 | |
1002 | case OVS_KEY_ATTR_MPLS: | |
83d2b9ba JR |
1003 | err = set_mpls(skb, flow_key, nla_data(a), get_mask(a, |
1004 | __be32 *)); | |
25cd9ba0 | 1005 | break; |
7f8a436e JS |
1006 | |
1007 | case OVS_KEY_ATTR_CT_STATE: | |
1008 | case OVS_KEY_ATTR_CT_ZONE: | |
182e3042 | 1009 | case OVS_KEY_ATTR_CT_MARK: |
33db4125 | 1010 | case OVS_KEY_ATTR_CT_LABELS: |
7f8a436e JS |
1011 | err = -EINVAL; |
1012 | break; | |
ccb1352e JG |
1013 | } |
1014 | ||
1015 | return err; | |
1016 | } | |
1017 | ||
971427f3 AZ |
1018 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
1019 | struct sw_flow_key *key, | |
1020 | const struct nlattr *a, int rem) | |
1021 | { | |
1022 | struct deferred_action *da; | |
971427f3 | 1023 | |
fff06c36 PS |
1024 | if (!is_flow_key_valid(key)) { |
1025 | int err; | |
1026 | ||
1027 | err = ovs_flow_key_update(skb, key); | |
1028 | if (err) | |
1029 | return err; | |
1030 | } | |
1031 | BUG_ON(!is_flow_key_valid(key)); | |
971427f3 | 1032 | |
941d8ebc | 1033 | if (!nla_is_last(a, rem)) { |
971427f3 AZ |
1034 | /* Recirc action is the not the last action |
1035 | * of the action list, need to clone the skb. | |
1036 | */ | |
1037 | skb = skb_clone(skb, GFP_ATOMIC); | |
1038 | ||
1039 | /* Skip the recirc action when out of memory, but | |
1040 | * continue on with the rest of the action list. | |
1041 | */ | |
1042 | if (!skb) | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | da = add_deferred_actions(skb, key, NULL); | |
1047 | if (da) { | |
1048 | da->pkt_key.recirc_id = nla_get_u32(a); | |
1049 | } else { | |
1050 | kfree_skb(skb); | |
1051 | ||
1052 | if (net_ratelimit()) | |
1053 | pr_warn("%s: deferred action limit reached, drop recirc action\n", | |
1054 | ovs_dp_name(dp)); | |
1055 | } | |
1056 | ||
1057 | return 0; | |
1058 | } | |
1059 | ||
ccb1352e JG |
1060 | /* Execute a list of actions against 'skb'. */ |
1061 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, | |
2ff3e4e4 | 1062 | struct sw_flow_key *key, |
651887b0 | 1063 | const struct nlattr *attr, int len) |
ccb1352e JG |
1064 | { |
1065 | /* Every output action needs a separate clone of 'skb', but the common | |
1066 | * case is just a single output action, so that doing a clone and | |
1067 | * then freeing the original skbuff is wasteful. So the following code | |
fff06c36 PS |
1068 | * is slightly obscure just to avoid that. |
1069 | */ | |
ccb1352e JG |
1070 | int prev_port = -1; |
1071 | const struct nlattr *a; | |
1072 | int rem; | |
1073 | ||
1074 | for (a = attr, rem = len; rem > 0; | |
1075 | a = nla_next(a, &rem)) { | |
1076 | int err = 0; | |
1077 | ||
738967b8 AZ |
1078 | if (unlikely(prev_port != -1)) { |
1079 | struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC); | |
1080 | ||
1081 | if (out_skb) | |
7f8a436e | 1082 | do_output(dp, out_skb, prev_port, key); |
738967b8 | 1083 | |
f2a4d086 | 1084 | OVS_CB(skb)->cutlen = 0; |
ccb1352e JG |
1085 | prev_port = -1; |
1086 | } | |
1087 | ||
1088 | switch (nla_type(a)) { | |
1089 | case OVS_ACTION_ATTR_OUTPUT: | |
1090 | prev_port = nla_get_u32(a); | |
1091 | break; | |
1092 | ||
f2a4d086 WT |
1093 | case OVS_ACTION_ATTR_TRUNC: { |
1094 | struct ovs_action_trunc *trunc = nla_data(a); | |
1095 | ||
1096 | if (skb->len > trunc->max_len) | |
1097 | OVS_CB(skb)->cutlen = skb->len - trunc->max_len; | |
1098 | break; | |
1099 | } | |
1100 | ||
ccb1352e | 1101 | case OVS_ACTION_ATTR_USERSPACE: |
f2a4d086 WT |
1102 | output_userspace(dp, skb, key, a, attr, |
1103 | len, OVS_CB(skb)->cutlen); | |
1104 | OVS_CB(skb)->cutlen = 0; | |
ccb1352e JG |
1105 | break; |
1106 | ||
971427f3 AZ |
1107 | case OVS_ACTION_ATTR_HASH: |
1108 | execute_hash(skb, key, a); | |
1109 | break; | |
1110 | ||
25cd9ba0 | 1111 | case OVS_ACTION_ATTR_PUSH_MPLS: |
fff06c36 | 1112 | err = push_mpls(skb, key, nla_data(a)); |
25cd9ba0 SH |
1113 | break; |
1114 | ||
1115 | case OVS_ACTION_ATTR_POP_MPLS: | |
fff06c36 | 1116 | err = pop_mpls(skb, key, nla_get_be16(a)); |
25cd9ba0 SH |
1117 | break; |
1118 | ||
ccb1352e | 1119 | case OVS_ACTION_ATTR_PUSH_VLAN: |
fff06c36 | 1120 | err = push_vlan(skb, key, nla_data(a)); |
ccb1352e JG |
1121 | break; |
1122 | ||
1123 | case OVS_ACTION_ATTR_POP_VLAN: | |
fff06c36 | 1124 | err = pop_vlan(skb, key); |
ccb1352e JG |
1125 | break; |
1126 | ||
971427f3 AZ |
1127 | case OVS_ACTION_ATTR_RECIRC: |
1128 | err = execute_recirc(dp, skb, key, a, rem); | |
941d8ebc | 1129 | if (nla_is_last(a, rem)) { |
971427f3 AZ |
1130 | /* If this is the last action, the skb has |
1131 | * been consumed or freed. | |
1132 | * Return immediately. | |
1133 | */ | |
1134 | return err; | |
1135 | } | |
1136 | break; | |
1137 | ||
ccb1352e | 1138 | case OVS_ACTION_ATTR_SET: |
fff06c36 | 1139 | err = execute_set_action(skb, key, nla_data(a)); |
ccb1352e JG |
1140 | break; |
1141 | ||
83d2b9ba JR |
1142 | case OVS_ACTION_ATTR_SET_MASKED: |
1143 | case OVS_ACTION_ATTR_SET_TO_MASKED: | |
1144 | err = execute_masked_set_action(skb, key, nla_data(a)); | |
1145 | break; | |
1146 | ||
ccb1352e | 1147 | case OVS_ACTION_ATTR_SAMPLE: |
ccea7445 | 1148 | err = sample(dp, skb, key, a, attr, len); |
ccb1352e | 1149 | break; |
7f8a436e JS |
1150 | |
1151 | case OVS_ACTION_ATTR_CT: | |
ec0d043d JS |
1152 | if (!is_flow_key_valid(key)) { |
1153 | err = ovs_flow_key_update(skb, key); | |
1154 | if (err) | |
1155 | return err; | |
1156 | } | |
1157 | ||
7f8a436e JS |
1158 | err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key, |
1159 | nla_data(a)); | |
1160 | ||
1161 | /* Hide stolen IP fragments from user space. */ | |
74c16618 JS |
1162 | if (err) |
1163 | return err == -EINPROGRESS ? 0 : err; | |
7f8a436e | 1164 | break; |
ccb1352e JG |
1165 | } |
1166 | ||
1167 | if (unlikely(err)) { | |
1168 | kfree_skb(skb); | |
1169 | return err; | |
1170 | } | |
1171 | } | |
1172 | ||
651887b0 | 1173 | if (prev_port != -1) |
7f8a436e | 1174 | do_output(dp, skb, prev_port, key); |
651887b0 | 1175 | else |
ccb1352e JG |
1176 | consume_skb(skb); |
1177 | ||
1178 | return 0; | |
1179 | } | |
1180 | ||
971427f3 AZ |
1181 | static void process_deferred_actions(struct datapath *dp) |
1182 | { | |
1183 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); | |
1184 | ||
1185 | /* Do not touch the FIFO in case there is no deferred actions. */ | |
1186 | if (action_fifo_is_empty(fifo)) | |
1187 | return; | |
1188 | ||
1189 | /* Finishing executing all deferred actions. */ | |
1190 | do { | |
1191 | struct deferred_action *da = action_fifo_get(fifo); | |
1192 | struct sk_buff *skb = da->skb; | |
1193 | struct sw_flow_key *key = &da->pkt_key; | |
1194 | const struct nlattr *actions = da->actions; | |
1195 | ||
1196 | if (actions) | |
1197 | do_execute_actions(dp, skb, key, actions, | |
1198 | nla_len(actions)); | |
1199 | else | |
1200 | ovs_dp_process_packet(skb, key); | |
1201 | } while (!action_fifo_is_empty(fifo)); | |
1202 | ||
1203 | /* Reset FIFO for the next packet. */ | |
1204 | action_fifo_init(fifo); | |
1205 | } | |
1206 | ||
ccb1352e | 1207 | /* Execute a list of actions against 'skb'. */ |
2ff3e4e4 | 1208 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
12eb18f7 TG |
1209 | const struct sw_flow_actions *acts, |
1210 | struct sw_flow_key *key) | |
ccb1352e | 1211 | { |
b064d0d8 HFS |
1212 | static const int ovs_recursion_limit = 5; |
1213 | int err, level; | |
1214 | ||
1215 | level = __this_cpu_inc_return(exec_actions_level); | |
1216 | if (unlikely(level > ovs_recursion_limit)) { | |
1217 | net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n", | |
1218 | ovs_dp_name(dp)); | |
1219 | kfree_skb(skb); | |
1220 | err = -ENETDOWN; | |
1221 | goto out; | |
1222 | } | |
971427f3 | 1223 | |
971427f3 AZ |
1224 | err = do_execute_actions(dp, skb, key, |
1225 | acts->actions, acts->actions_len); | |
1226 | ||
b064d0d8 | 1227 | if (level == 1) |
971427f3 AZ |
1228 | process_deferred_actions(dp); |
1229 | ||
b064d0d8 HFS |
1230 | out: |
1231 | __this_cpu_dec(exec_actions_level); | |
971427f3 AZ |
1232 | return err; |
1233 | } | |
1234 | ||
1235 | int action_fifos_init(void) | |
1236 | { | |
1237 | action_fifos = alloc_percpu(struct action_fifo); | |
1238 | if (!action_fifos) | |
1239 | return -ENOMEM; | |
ccb1352e | 1240 | |
971427f3 AZ |
1241 | return 0; |
1242 | } | |
1243 | ||
1244 | void action_fifos_exit(void) | |
1245 | { | |
1246 | free_percpu(action_fifos); | |
ccb1352e | 1247 | } |