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Commit | Line | Data |
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064af421 | 1 | /* |
d1d71a36 | 2 | * Copyright (c) 2007-2013 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> |
10f72e3d | 25 | #include <linux/sctp.h> |
064af421 BP |
26 | #include <linux/tcp.h> |
27 | #include <linux/udp.h> | |
28 | #include <linux/in6.h> | |
401eeb92 | 29 | #include <linux/if_arp.h> |
064af421 BP |
30 | #include <linux/if_vlan.h> |
31 | #include <net/ip.h> | |
bc7a5acd | 32 | #include <net/ipv6.h> |
064af421 | 33 | #include <net/checksum.h> |
530180fd | 34 | #include <net/dsfield.h> |
10f72e3d | 35 | #include <net/sctp/checksum.h> |
f2459fe7 | 36 | |
f2459fe7 | 37 | #include "datapath.h" |
6ce39213 | 38 | #include "vlan.h" |
f2459fe7 | 39 | #include "vport.h" |
064af421 | 40 | |
6ff686f2 | 41 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
85c9de19 | 42 | const struct nlattr *attr, int len, bool keep_skb); |
871dfe07 | 43 | |
10db8b20 | 44 | static int make_writable(struct sk_buff *skb, int write_len) |
064af421 | 45 | { |
10db8b20 JG |
46 | if (!skb_cloned(skb) || skb_clone_writable(skb, write_len)) |
47 | return 0; | |
0cd8a05e | 48 | |
10db8b20 | 49 | return pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
064af421 BP |
50 | } |
51 | ||
b2492cb7 | 52 | /* remove VLAN header from packet and update csum accordingly. */ |
d9065a90 | 53 | static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci) |
064af421 | 54 | { |
ceb176fd | 55 | struct vlan_hdr *vhdr; |
10db8b20 | 56 | int err; |
064af421 | 57 | |
10db8b20 JG |
58 | err = make_writable(skb, VLAN_ETH_HLEN); |
59 | if (unlikely(err)) | |
60 | return err; | |
6ce39213 | 61 | |
237c4f2a | 62 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
635c9298 | 63 | skb->csum = csum_sub(skb->csum, csum_partial(skb->data |
af9d14a8 | 64 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
635c9298 | 65 | |
ceb176fd PS |
66 | vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN); |
67 | *current_tci = vhdr->h_vlan_TCI; | |
d9065a90 | 68 | |
6ce39213 | 69 | memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); |
ceb176fd | 70 | __skb_pull(skb, VLAN_HLEN); |
064af421 | 71 | |
ceb176fd | 72 | vlan_set_encap_proto(skb, vhdr); |
064af421 | 73 | skb->mac_header += VLAN_HLEN; |
ceb176fd | 74 | skb_reset_mac_len(skb); |
064af421 | 75 | |
10db8b20 | 76 | return 0; |
064af421 BP |
77 | } |
78 | ||
d9065a90 | 79 | static int pop_vlan(struct sk_buff *skb) |
064af421 | 80 | { |
d9065a90 PS |
81 | __be16 tci; |
82 | int err; | |
10db8b20 | 83 | |
d9065a90 PS |
84 | if (likely(vlan_tx_tag_present(skb))) { |
85 | vlan_set_tci(skb, 0); | |
86 | } else { | |
87 | if (unlikely(skb->protocol != htons(ETH_P_8021Q) || | |
fb516ed8 | 88 | skb->len < VLAN_ETH_HLEN)) |
10db8b20 | 89 | return 0; |
064af421 | 90 | |
d9065a90 PS |
91 | err = __pop_vlan_tci(skb, &tci); |
92 | if (err) | |
10db8b20 | 93 | return err; |
064af421 | 94 | } |
d9065a90 PS |
95 | /* move next vlan tag to hw accel tag */ |
96 | if (likely(skb->protocol != htons(ETH_P_8021Q) || | |
fb516ed8 | 97 | skb->len < VLAN_ETH_HLEN)) |
d9065a90 PS |
98 | return 0; |
99 | ||
100 | err = __pop_vlan_tci(skb, &tci); | |
101 | if (unlikely(err)) | |
102 | return err; | |
064af421 | 103 | |
9b764edf | 104 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci)); |
d9065a90 PS |
105 | return 0; |
106 | } | |
107 | ||
fea393b1 | 108 | static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan) |
d9065a90 PS |
109 | { |
110 | if (unlikely(vlan_tx_tag_present(skb))) { | |
111 | u16 current_tag; | |
112 | ||
113 | /* push down current VLAN tag */ | |
114 | current_tag = vlan_tx_tag_get(skb); | |
115 | ||
9b764edf | 116 | if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag)) |
d9065a90 | 117 | return -ENOMEM; |
10db8b20 | 118 | |
237c4f2a | 119 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
d9065a90 | 120 | skb->csum = csum_add(skb->csum, csum_partial(skb->data |
af9d14a8 | 121 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
d9065a90 PS |
122 | |
123 | } | |
9b764edf | 124 | __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); |
10db8b20 | 125 | return 0; |
064af421 BP |
126 | } |
127 | ||
4edb9ae9 PS |
128 | static int set_eth_addr(struct sk_buff *skb, |
129 | const struct ovs_key_ethernet *eth_key) | |
ca78c6b6 | 130 | { |
4edb9ae9 PS |
131 | int err; |
132 | err = make_writable(skb, ETH_HLEN); | |
133 | if (unlikely(err)) | |
134 | return err; | |
135 | ||
237c4f2a | 136 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 137 | |
39640c1b PS |
138 | memcpy(eth_hdr(skb)->h_source, eth_key->eth_src, ETH_ALEN); |
139 | memcpy(eth_hdr(skb)->h_dest, eth_key->eth_dst, ETH_ALEN); | |
4edb9ae9 | 140 | |
237c4f2a | 141 | ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 142 | |
4edb9ae9 | 143 | return 0; |
ca78c6b6 BP |
144 | } |
145 | ||
4edb9ae9 PS |
146 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
147 | __be32 *addr, __be32 new_addr) | |
ca78c6b6 BP |
148 | { |
149 | int transport_len = skb->len - skb_transport_offset(skb); | |
4edb9ae9 PS |
150 | |
151 | if (nh->protocol == IPPROTO_TCP) { | |
ca78c6b6 | 152 | if (likely(transport_len >= sizeof(struct tcphdr))) |
4edb9ae9 PS |
153 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, |
154 | *addr, new_addr, 1); | |
155 | } else if (nh->protocol == IPPROTO_UDP) { | |
55ce87bc JG |
156 | if (likely(transport_len >= sizeof(struct udphdr))) { |
157 | struct udphdr *uh = udp_hdr(skb); | |
158 | ||
237c4f2a | 159 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
55ce87bc JG |
160 | inet_proto_csum_replace4(&uh->check, skb, |
161 | *addr, new_addr, 1); | |
162 | if (!uh->check) | |
163 | uh->check = CSUM_MANGLED_0; | |
164 | } | |
165 | } | |
ca78c6b6 | 166 | } |
4edb9ae9 PS |
167 | |
168 | csum_replace4(&nh->check, *addr, new_addr); | |
169 | skb_clear_rxhash(skb); | |
170 | *addr = new_addr; | |
ca78c6b6 BP |
171 | } |
172 | ||
bc7a5acd AA |
173 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
174 | __be32 addr[4], const __be32 new_addr[4]) | |
175 | { | |
176 | int transport_len = skb->len - skb_transport_offset(skb); | |
177 | ||
178 | if (l4_proto == IPPROTO_TCP) { | |
179 | if (likely(transport_len >= sizeof(struct tcphdr))) | |
180 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
181 | addr, new_addr, 1); | |
182 | } else if (l4_proto == IPPROTO_UDP) { | |
183 | if (likely(transport_len >= sizeof(struct udphdr))) { | |
184 | struct udphdr *uh = udp_hdr(skb); | |
185 | ||
237c4f2a | 186 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
bc7a5acd AA |
187 | inet_proto_csum_replace16(&uh->check, skb, |
188 | addr, new_addr, 1); | |
189 | if (!uh->check) | |
190 | uh->check = CSUM_MANGLED_0; | |
191 | } | |
192 | } | |
193 | } | |
194 | } | |
195 | ||
196 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, | |
197 | __be32 addr[4], const __be32 new_addr[4], | |
198 | bool recalculate_csum) | |
199 | { | |
200 | if (recalculate_csum) | |
201 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); | |
202 | ||
203 | skb_clear_rxhash(skb); | |
204 | memcpy(addr, new_addr, sizeof(__be32[4])); | |
205 | } | |
206 | ||
207 | static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc) | |
208 | { | |
209 | nh->priority = tc >> 4; | |
210 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4); | |
211 | } | |
212 | ||
213 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl) | |
214 | { | |
215 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16; | |
216 | nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8; | |
217 | nh->flow_lbl[2] = fl & 0x000000FF; | |
218 | } | |
219 | ||
a61680c6 JP |
220 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl) |
221 | { | |
222 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); | |
223 | nh->ttl = new_ttl; | |
224 | } | |
225 | ||
4edb9ae9 | 226 | static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key) |
064af421 | 227 | { |
ca78c6b6 | 228 | struct iphdr *nh; |
10db8b20 | 229 | int err; |
ca78c6b6 | 230 | |
10db8b20 JG |
231 | err = make_writable(skb, skb_network_offset(skb) + |
232 | sizeof(struct iphdr)); | |
233 | if (unlikely(err)) | |
234 | return err; | |
ca78c6b6 BP |
235 | |
236 | nh = ip_hdr(skb); | |
ca78c6b6 | 237 | |
4edb9ae9 PS |
238 | if (ipv4_key->ipv4_src != nh->saddr) |
239 | set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src); | |
ca78c6b6 | 240 | |
4edb9ae9 PS |
241 | if (ipv4_key->ipv4_dst != nh->daddr) |
242 | set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst); | |
a4a26436 | 243 | |
4edb9ae9 | 244 | if (ipv4_key->ipv4_tos != nh->tos) |
530180fd | 245 | ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos); |
ca78c6b6 | 246 | |
a61680c6 JP |
247 | if (ipv4_key->ipv4_ttl != nh->ttl) |
248 | set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl); | |
249 | ||
10db8b20 | 250 | return 0; |
064af421 BP |
251 | } |
252 | ||
bc7a5acd AA |
253 | static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key) |
254 | { | |
255 | struct ipv6hdr *nh; | |
256 | int err; | |
257 | __be32 *saddr; | |
258 | __be32 *daddr; | |
259 | ||
260 | err = make_writable(skb, skb_network_offset(skb) + | |
261 | sizeof(struct ipv6hdr)); | |
262 | if (unlikely(err)) | |
263 | return err; | |
264 | ||
265 | nh = ipv6_hdr(skb); | |
266 | saddr = (__be32 *)&nh->saddr; | |
267 | daddr = (__be32 *)&nh->daddr; | |
268 | ||
269 | if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) | |
270 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr, | |
271 | ipv6_key->ipv6_src, true); | |
272 | ||
273 | if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) { | |
274 | unsigned int offset = 0; | |
275 | int flags = OVS_IP6T_FH_F_SKIP_RH; | |
276 | bool recalc_csum = true; | |
277 | ||
278 | if (ipv6_ext_hdr(nh->nexthdr)) | |
279 | recalc_csum = ipv6_find_hdr(skb, &offset, | |
280 | NEXTHDR_ROUTING, NULL, | |
281 | &flags) != NEXTHDR_ROUTING; | |
282 | ||
283 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr, | |
284 | ipv6_key->ipv6_dst, recalc_csum); | |
285 | } | |
286 | ||
287 | set_ipv6_tc(nh, ipv6_key->ipv6_tclass); | |
288 | set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label)); | |
289 | nh->hop_limit = ipv6_key->ipv6_hlimit; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
4edb9ae9 PS |
294 | /* Must follow make_writable() since that can move the skb data. */ |
295 | static void set_tp_port(struct sk_buff *skb, __be16 *port, | |
296 | __be16 new_port, __sum16 *check) | |
959a2ecd | 297 | { |
4edb9ae9 PS |
298 | inet_proto_csum_replace2(check, skb, *port, new_port, 0); |
299 | *port = new_port; | |
300 | skb_clear_rxhash(skb); | |
301 | } | |
10db8b20 | 302 | |
55ce87bc JG |
303 | static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port) |
304 | { | |
305 | struct udphdr *uh = udp_hdr(skb); | |
306 | ||
237c4f2a | 307 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
55ce87bc JG |
308 | set_tp_port(skb, port, new_port, &uh->check); |
309 | ||
310 | if (!uh->check) | |
311 | uh->check = CSUM_MANGLED_0; | |
312 | } else { | |
313 | *port = new_port; | |
314 | skb_clear_rxhash(skb); | |
315 | } | |
316 | } | |
317 | ||
318 | static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key) | |
4edb9ae9 PS |
319 | { |
320 | struct udphdr *uh; | |
321 | int err; | |
10db8b20 | 322 | |
4edb9ae9 PS |
323 | err = make_writable(skb, skb_transport_offset(skb) + |
324 | sizeof(struct udphdr)); | |
10db8b20 JG |
325 | if (unlikely(err)) |
326 | return err; | |
327 | ||
4edb9ae9 PS |
328 | uh = udp_hdr(skb); |
329 | if (udp_port_key->udp_src != uh->source) | |
55ce87bc | 330 | set_udp_port(skb, &uh->source, udp_port_key->udp_src); |
4edb9ae9 PS |
331 | |
332 | if (udp_port_key->udp_dst != uh->dest) | |
55ce87bc | 333 | set_udp_port(skb, &uh->dest, udp_port_key->udp_dst); |
10db8b20 JG |
334 | |
335 | return 0; | |
959a2ecd JP |
336 | } |
337 | ||
55ce87bc | 338 | static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key) |
064af421 | 339 | { |
4edb9ae9 | 340 | struct tcphdr *th; |
10db8b20 | 341 | int err; |
064af421 | 342 | |
10db8b20 JG |
343 | err = make_writable(skb, skb_transport_offset(skb) + |
344 | sizeof(struct tcphdr)); | |
345 | if (unlikely(err)) | |
346 | return err; | |
ca78c6b6 | 347 | |
4edb9ae9 PS |
348 | th = tcp_hdr(skb); |
349 | if (tcp_port_key->tcp_src != th->source) | |
350 | set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check); | |
064af421 | 351 | |
4edb9ae9 PS |
352 | if (tcp_port_key->tcp_dst != th->dest) |
353 | set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check); | |
ca78c6b6 | 354 | |
10db8b20 | 355 | return 0; |
064af421 BP |
356 | } |
357 | ||
10f72e3d JS |
358 | static int set_sctp(struct sk_buff *skb, |
359 | const struct ovs_key_sctp *sctp_port_key) | |
360 | { | |
361 | struct sctphdr *sh; | |
362 | int err; | |
363 | unsigned int sctphoff = skb_transport_offset(skb); | |
364 | ||
365 | err = make_writable(skb, sctphoff + sizeof(struct sctphdr)); | |
366 | if (unlikely(err)) | |
367 | return err; | |
368 | ||
369 | sh = sctp_hdr(skb); | |
370 | if (sctp_port_key->sctp_src != sh->source || | |
371 | sctp_port_key->sctp_dst != sh->dest) { | |
372 | __le32 old_correct_csum, new_csum, old_csum; | |
373 | ||
374 | old_csum = sh->checksum; | |
375 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
376 | ||
377 | sh->source = sctp_port_key->sctp_src; | |
378 | sh->dest = sctp_port_key->sctp_dst; | |
379 | ||
380 | new_csum = sctp_compute_cksum(skb, sctphoff); | |
381 | ||
382 | /* Carry any checksum errors through. */ | |
383 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
384 | ||
385 | skb_clear_rxhash(skb); | |
386 | } | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
f15c8639 | 391 | static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port) |
064af421 | 392 | { |
f15c8639 | 393 | struct vport *vport; |
064af421 | 394 | |
f15c8639 JG |
395 | if (unlikely(!skb)) |
396 | return -ENOMEM; | |
064af421 | 397 | |
95b1d73a | 398 | vport = ovs_vport_rcu(dp, out_port); |
f15c8639 JG |
399 | if (unlikely(!vport)) { |
400 | kfree_skb(skb); | |
401 | return -ENODEV; | |
402 | } | |
064af421 | 403 | |
850b6b3b | 404 | ovs_vport_send(vport, skb); |
f15c8639 | 405 | return 0; |
064af421 BP |
406 | } |
407 | ||
98403001 BP |
408 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, |
409 | const struct nlattr *attr) | |
064af421 | 410 | { |
856081f6 | 411 | struct dp_upcall_info upcall; |
98403001 BP |
412 | const struct nlattr *a; |
413 | int rem; | |
856081f6 | 414 | |
d1d71a36 AZ |
415 | BUG_ON(!OVS_CB(skb)->pkt_key); |
416 | ||
df2c07f4 | 417 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
d1d71a36 | 418 | upcall.key = OVS_CB(skb)->pkt_key; |
98403001 | 419 | upcall.userdata = NULL; |
28aea917 | 420 | upcall.portid = 0; |
98403001 BP |
421 | |
422 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
423 | a = nla_next(a, &rem)) { | |
424 | switch (nla_type(a)) { | |
425 | case OVS_USERSPACE_ATTR_USERDATA: | |
426 | upcall.userdata = a; | |
427 | break; | |
428 | ||
429 | case OVS_USERSPACE_ATTR_PID: | |
28aea917 | 430 | upcall.portid = nla_get_u32(a); |
98403001 BP |
431 | break; |
432 | } | |
433 | } | |
434 | ||
850b6b3b | 435 | return ovs_dp_upcall(dp, skb, &upcall); |
064af421 BP |
436 | } |
437 | ||
6ff686f2 | 438 | static int sample(struct datapath *dp, struct sk_buff *skb, |
85c9de19 | 439 | const struct nlattr *attr) |
6ff686f2 PS |
440 | { |
441 | const struct nlattr *acts_list = NULL; | |
442 | const struct nlattr *a; | |
443 | int rem; | |
444 | ||
445 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
446 | a = nla_next(a, &rem)) { | |
447 | switch (nla_type(a)) { | |
448 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
449 | if (net_random() >= nla_get_u32(a)) | |
450 | return 0; | |
451 | break; | |
452 | ||
453 | case OVS_SAMPLE_ATTR_ACTIONS: | |
454 | acts_list = a; | |
455 | break; | |
456 | } | |
457 | } | |
458 | ||
459 | return do_execute_actions(dp, skb, nla_data(acts_list), | |
85c9de19 | 460 | nla_len(acts_list), true); |
6ff686f2 PS |
461 | } |
462 | ||
4edb9ae9 | 463 | static int execute_set_action(struct sk_buff *skb, |
85c9de19 | 464 | const struct nlattr *nested_attr) |
4edb9ae9 | 465 | { |
15c39847 | 466 | int err = 0; |
4edb9ae9 PS |
467 | |
468 | switch (nla_type(nested_attr)) { | |
abff858b PS |
469 | case OVS_KEY_ATTR_PRIORITY: |
470 | skb->priority = nla_get_u32(nested_attr); | |
471 | break; | |
472 | ||
72e8bf28 | 473 | case OVS_KEY_ATTR_SKB_MARK: |
3025a772 | 474 | skb->mark = nla_get_u32(nested_attr); |
72e8bf28 AA |
475 | break; |
476 | ||
356af50b KM |
477 | case OVS_KEY_ATTR_IPV4_TUNNEL: |
478 | OVS_CB(skb)->tun_key = nla_data(nested_attr); | |
4edb9ae9 PS |
479 | break; |
480 | ||
481 | case OVS_KEY_ATTR_ETHERNET: | |
482 | err = set_eth_addr(skb, nla_data(nested_attr)); | |
483 | break; | |
484 | ||
485 | case OVS_KEY_ATTR_IPV4: | |
486 | err = set_ipv4(skb, nla_data(nested_attr)); | |
487 | break; | |
488 | ||
bc7a5acd AA |
489 | case OVS_KEY_ATTR_IPV6: |
490 | err = set_ipv6(skb, nla_data(nested_attr)); | |
491 | break; | |
492 | ||
4edb9ae9 | 493 | case OVS_KEY_ATTR_TCP: |
55ce87bc | 494 | err = set_tcp(skb, nla_data(nested_attr)); |
4edb9ae9 PS |
495 | break; |
496 | ||
497 | case OVS_KEY_ATTR_UDP: | |
55ce87bc | 498 | err = set_udp(skb, nla_data(nested_attr)); |
4edb9ae9 | 499 | break; |
10f72e3d JS |
500 | |
501 | case OVS_KEY_ATTR_SCTP: | |
502 | err = set_sctp(skb, nla_data(nested_attr)); | |
503 | break; | |
4edb9ae9 | 504 | } |
15c39847 | 505 | |
4edb9ae9 PS |
506 | return err; |
507 | } | |
508 | ||
064af421 | 509 | /* Execute a list of actions against 'skb'. */ |
871dfe07 | 510 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
85c9de19 | 511 | const struct nlattr *attr, int len, bool keep_skb) |
064af421 BP |
512 | { |
513 | /* Every output action needs a separate clone of 'skb', but the common | |
514 | * case is just a single output action, so that doing a clone and | |
515 | * then freeing the original skbuff is wasteful. So the following code | |
516 | * is slightly obscure just to avoid that. */ | |
517 | int prev_port = -1; | |
cdee00fd | 518 | const struct nlattr *a; |
10db8b20 | 519 | int rem; |
72b06300 | 520 | |
6ff686f2 | 521 | for (a = attr, rem = len; rem > 0; |
a4af2475 | 522 | a = nla_next(a, &rem)) { |
10db8b20 JG |
523 | int err = 0; |
524 | ||
064af421 | 525 | if (prev_port != -1) { |
7956695a | 526 | do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port); |
064af421 BP |
527 | prev_port = -1; |
528 | } | |
529 | ||
cdee00fd | 530 | switch (nla_type(a)) { |
df2c07f4 | 531 | case OVS_ACTION_ATTR_OUTPUT: |
cdee00fd | 532 | prev_port = nla_get_u32(a); |
064af421 BP |
533 | break; |
534 | ||
df2c07f4 | 535 | case OVS_ACTION_ATTR_USERSPACE: |
98403001 | 536 | output_userspace(dp, skb, a); |
064af421 BP |
537 | break; |
538 | ||
fea393b1 BP |
539 | case OVS_ACTION_ATTR_PUSH_VLAN: |
540 | err = push_vlan(skb, nla_data(a)); | |
4edb9ae9 | 541 | if (unlikely(err)) /* skb already freed. */ |
d9065a90 | 542 | return err; |
064af421 BP |
543 | break; |
544 | ||
fea393b1 | 545 | case OVS_ACTION_ATTR_POP_VLAN: |
d9065a90 | 546 | err = pop_vlan(skb); |
064af421 BP |
547 | break; |
548 | ||
4edb9ae9 | 549 | case OVS_ACTION_ATTR_SET: |
85c9de19 | 550 | err = execute_set_action(skb, nla_data(a)); |
064af421 | 551 | break; |
c1c9c9c4 | 552 | |
6ff686f2 | 553 | case OVS_ACTION_ATTR_SAMPLE: |
85c9de19 | 554 | err = sample(dp, skb, a); |
6ff686f2 | 555 | break; |
6ff686f2 | 556 | } |
15c39847 | 557 | |
10db8b20 JG |
558 | if (unlikely(err)) { |
559 | kfree_skb(skb); | |
560 | return err; | |
561 | } | |
064af421 | 562 | } |
6c222e55 | 563 | |
6ff686f2 PS |
564 | if (prev_port != -1) { |
565 | if (keep_skb) | |
566 | skb = skb_clone(skb, GFP_ATOMIC); | |
567 | ||
064af421 | 568 | do_output(dp, skb, prev_port); |
6ff686f2 | 569 | } else if (!keep_skb) |
5b95ab0e | 570 | consume_skb(skb); |
10db8b20 | 571 | |
a5225dd6 | 572 | return 0; |
064af421 | 573 | } |
871dfe07 | 574 | |
e9141eec PS |
575 | /* We limit the number of times that we pass into execute_actions() |
576 | * to avoid blowing out the stack in the event that we have a loop. */ | |
09dc0415 | 577 | #define MAX_LOOPS 4 |
e9141eec PS |
578 | |
579 | struct loop_counter { | |
580 | u8 count; /* Count. */ | |
581 | bool looping; /* Loop detected? */ | |
582 | }; | |
583 | ||
584 | static DEFINE_PER_CPU(struct loop_counter, loop_counters); | |
585 | ||
586 | static int loop_suppress(struct datapath *dp, struct sw_flow_actions *actions) | |
587 | { | |
588 | if (net_ratelimit()) | |
589 | pr_warn("%s: flow looped %d times, dropping\n", | |
850b6b3b | 590 | ovs_dp_name(dp), MAX_LOOPS); |
e9141eec PS |
591 | actions->actions_len = 0; |
592 | return -ELOOP; | |
593 | } | |
594 | ||
871dfe07 | 595 | /* Execute a list of actions against 'skb'. */ |
850b6b3b | 596 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb) |
871dfe07 | 597 | { |
a4af2475 BP |
598 | struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts); |
599 | struct loop_counter *loop; | |
600 | int error; | |
601 | ||
602 | /* Check whether we've looped too much. */ | |
e9141eec | 603 | loop = &__get_cpu_var(loop_counters); |
a4af2475 BP |
604 | if (unlikely(++loop->count > MAX_LOOPS)) |
605 | loop->looping = true; | |
606 | if (unlikely(loop->looping)) { | |
607 | error = loop_suppress(dp, acts); | |
608 | kfree_skb(skb); | |
609 | goto out_loop; | |
610 | } | |
871dfe07 | 611 | |
356af50b | 612 | OVS_CB(skb)->tun_key = NULL; |
6ff686f2 | 613 | error = do_execute_actions(dp, skb, acts->actions, |
85c9de19 | 614 | acts->actions_len, false); |
a4af2475 BP |
615 | |
616 | /* Check whether sub-actions looped too much. */ | |
617 | if (unlikely(loop->looping)) | |
618 | error = loop_suppress(dp, acts); | |
619 | ||
620 | out_loop: | |
621 | /* Decrement loop counter. */ | |
622 | if (!--loop->count) | |
623 | loop->looping = false; | |
871dfe07 | 624 | |
a4af2475 | 625 | return error; |
871dfe07 | 626 | } |