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Commit | Line | Data |
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064af421 | 1 | /* |
a6059080 | 2 | * Copyright (c) 2007-2014 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" |
ccf43786 SH |
38 | #include "gso.h" |
39 | #include "mpls.h" | |
6ce39213 | 40 | #include "vlan.h" |
f2459fe7 | 41 | #include "vport.h" |
064af421 | 42 | |
e0a42ae2 AZ |
43 | static void flow_key_clone(struct sk_buff *skb, struct sw_flow_key *new_key) |
44 | { | |
45 | *new_key = *OVS_CB(skb)->pkt_key; | |
46 | OVS_CB(skb)->pkt_key = new_key; | |
47 | } | |
48 | ||
49 | static void flow_key_set_recirc_id(struct sk_buff *skb, u32 recirc_id) | |
50 | { | |
51 | OVS_CB(skb)->pkt_key->recirc_id = recirc_id; | |
52 | } | |
53 | ||
e16138e2 PS |
54 | static void flow_key_set_priority(struct sk_buff *skb, u32 priority) |
55 | { | |
56 | OVS_CB(skb)->pkt_key->phy.priority = priority; | |
57 | } | |
58 | ||
59 | static void flow_key_set_skb_mark(struct sk_buff *skb, u32 skb_mark) | |
60 | { | |
61 | OVS_CB(skb)->pkt_key->phy.skb_mark = skb_mark; | |
62 | } | |
63 | ||
64 | static void flow_key_set_eth_src(struct sk_buff *skb, const u8 addr[]) | |
65 | { | |
66 | ether_addr_copy(OVS_CB(skb)->pkt_key->eth.src, addr); | |
67 | } | |
68 | ||
69 | static void flow_key_set_eth_dst(struct sk_buff *skb, const u8 addr[]) | |
70 | { | |
71 | ether_addr_copy(OVS_CB(skb)->pkt_key->eth.dst, addr); | |
72 | } | |
73 | ||
74 | static void flow_key_set_vlan_tci(struct sk_buff *skb, __be16 tci) | |
75 | { | |
76 | OVS_CB(skb)->pkt_key->eth.tci = tci; | |
77 | } | |
78 | ||
79 | static void flow_key_set_mpls_top_lse(struct sk_buff *skb, __be32 top_lse) | |
80 | { | |
81 | OVS_CB(skb)->pkt_key->mpls.top_lse = top_lse; | |
82 | } | |
83 | ||
84 | static void flow_key_set_ipv4_src(struct sk_buff *skb, __be32 addr) | |
85 | { | |
86 | OVS_CB(skb)->pkt_key->ipv4.addr.src = addr; | |
87 | } | |
88 | ||
89 | static void flow_key_set_ipv4_dst(struct sk_buff *skb, __be32 addr) | |
90 | { | |
91 | OVS_CB(skb)->pkt_key->ipv4.addr.src = addr; | |
92 | } | |
93 | ||
94 | static void flow_key_set_ip_tos(struct sk_buff *skb, u8 tos) | |
95 | { | |
96 | OVS_CB(skb)->pkt_key->ip.tos = tos; | |
97 | } | |
98 | ||
99 | static void flow_key_set_ip_ttl(struct sk_buff *skb, u8 ttl) | |
100 | { | |
101 | OVS_CB(skb)->pkt_key->ip.ttl = ttl; | |
102 | } | |
103 | ||
104 | static void flow_key_set_ipv6_src(struct sk_buff *skb, | |
105 | const __be32 addr[4]) | |
106 | { | |
107 | memcpy(&OVS_CB(skb)->pkt_key->ipv6.addr.src, addr, sizeof(__be32[4])); | |
108 | } | |
109 | ||
110 | static void flow_key_set_ipv6_dst(struct sk_buff *skb, | |
111 | const __be32 addr[4]) | |
112 | { | |
113 | memcpy(&OVS_CB(skb)->pkt_key->ipv6.addr.dst, addr, sizeof(__be32[4])); | |
114 | } | |
115 | ||
116 | static void flow_key_set_ipv6_fl(struct sk_buff *skb, | |
117 | const struct ipv6hdr *nh) | |
118 | { | |
119 | OVS_CB(skb)->pkt_key->ipv6.label = *(__be32 *)nh & | |
120 | htonl(IPV6_FLOWINFO_FLOWLABEL); | |
121 | } | |
122 | ||
123 | static void flow_key_set_tp_src(struct sk_buff *skb, __be16 port) | |
124 | { | |
125 | OVS_CB(skb)->pkt_key->tp.src = port; | |
126 | } | |
127 | ||
128 | static void flow_key_set_tp_dst(struct sk_buff *skb, __be16 port) | |
129 | { | |
130 | OVS_CB(skb)->pkt_key->tp.dst = port; | |
131 | } | |
132 | ||
133 | static void invalidate_skb_flow_key(struct sk_buff *skb) | |
134 | { | |
135 | OVS_CB(skb)->pkt_key->eth.type = htons(0); | |
136 | } | |
137 | ||
138 | static bool is_skb_flow_key_valid(struct sk_buff *skb) | |
139 | { | |
140 | return !!OVS_CB(skb)->pkt_key->eth.type; | |
141 | } | |
142 | ||
6ff686f2 | 143 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
fbf4f74d | 144 | const struct nlattr *attr, int len); |
871dfe07 | 145 | |
10db8b20 | 146 | static int make_writable(struct sk_buff *skb, int write_len) |
064af421 | 147 | { |
10db8b20 JG |
148 | if (!skb_cloned(skb) || skb_clone_writable(skb, write_len)) |
149 | return 0; | |
0cd8a05e | 150 | |
10db8b20 | 151 | return pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
064af421 BP |
152 | } |
153 | ||
ccf43786 SH |
154 | /* The end of the mac header. |
155 | * | |
156 | * For non-MPLS skbs this will correspond to the network header. | |
157 | * For MPLS skbs it will be before the network_header as the MPLS | |
158 | * label stack lies between the end of the mac header and the network | |
159 | * header. That is, for MPLS skbs the end of the mac header | |
160 | * is the top of the MPLS label stack. | |
161 | */ | |
162 | static unsigned char *mac_header_end(const struct sk_buff *skb) | |
163 | { | |
164 | return skb_mac_header(skb) + skb->mac_len; | |
165 | } | |
166 | ||
167 | static int push_mpls(struct sk_buff *skb, | |
168 | const struct ovs_action_push_mpls *mpls) | |
169 | { | |
170 | __be32 *new_mpls_lse; | |
171 | struct ethhdr *hdr; | |
172 | ||
173 | if (skb_cow_head(skb, MPLS_HLEN) < 0) | |
174 | return -ENOMEM; | |
175 | ||
176 | skb_push(skb, MPLS_HLEN); | |
177 | memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb), | |
178 | skb->mac_len); | |
179 | skb_reset_mac_header(skb); | |
180 | ||
181 | new_mpls_lse = (__be32 *)mac_header_end(skb); | |
182 | *new_mpls_lse = mpls->mpls_lse; | |
183 | ||
184 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
185 | skb->csum = csum_add(skb->csum, csum_partial(new_mpls_lse, | |
186 | MPLS_HLEN, 0)); | |
187 | ||
188 | hdr = eth_hdr(skb); | |
189 | hdr->h_proto = mpls->mpls_ethertype; | |
190 | if (!ovs_skb_get_inner_protocol(skb)) | |
191 | ovs_skb_set_inner_protocol(skb, skb->protocol); | |
192 | skb->protocol = mpls->mpls_ethertype; | |
e16138e2 | 193 | invalidate_skb_flow_key(skb); |
ccf43786 SH |
194 | return 0; |
195 | } | |
196 | ||
197 | static int pop_mpls(struct sk_buff *skb, const __be16 ethertype) | |
198 | { | |
199 | struct ethhdr *hdr; | |
200 | int err; | |
201 | ||
202 | err = make_writable(skb, skb->mac_len + MPLS_HLEN); | |
203 | if (unlikely(err)) | |
204 | return err; | |
205 | ||
206 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
207 | skb->csum = csum_sub(skb->csum, | |
208 | csum_partial(mac_header_end(skb), | |
209 | MPLS_HLEN, 0)); | |
210 | ||
211 | memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb), | |
212 | skb->mac_len); | |
213 | ||
214 | __skb_pull(skb, MPLS_HLEN); | |
215 | skb_reset_mac_header(skb); | |
216 | ||
217 | /* mac_header_end() is used to locate the ethertype | |
218 | * field correctly in the presence of VLAN tags. | |
219 | */ | |
220 | hdr = (struct ethhdr *)(mac_header_end(skb) - ETH_HLEN); | |
221 | hdr->h_proto = ethertype; | |
222 | if (eth_p_mpls(skb->protocol)) | |
223 | skb->protocol = ethertype; | |
e16138e2 | 224 | invalidate_skb_flow_key(skb); |
ccf43786 SH |
225 | return 0; |
226 | } | |
227 | ||
228 | static int set_mpls(struct sk_buff *skb, const __be32 *mpls_lse) | |
229 | { | |
230 | __be32 *stack = (__be32 *)mac_header_end(skb); | |
231 | int err; | |
232 | ||
233 | err = make_writable(skb, skb->mac_len + MPLS_HLEN); | |
234 | if (unlikely(err)) | |
235 | return err; | |
236 | ||
237 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
238 | __be32 diff[] = { ~(*stack), *mpls_lse }; | |
239 | skb->csum = ~csum_partial((char *)diff, sizeof(diff), | |
240 | ~skb->csum); | |
241 | } | |
242 | ||
243 | *stack = *mpls_lse; | |
e16138e2 | 244 | flow_key_set_mpls_top_lse(skb, *stack); |
ccf43786 SH |
245 | return 0; |
246 | } | |
247 | ||
b2492cb7 | 248 | /* remove VLAN header from packet and update csum accordingly. */ |
d9065a90 | 249 | static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci) |
064af421 | 250 | { |
ceb176fd | 251 | struct vlan_hdr *vhdr; |
10db8b20 | 252 | int err; |
064af421 | 253 | |
10db8b20 JG |
254 | err = make_writable(skb, VLAN_ETH_HLEN); |
255 | if (unlikely(err)) | |
256 | return err; | |
6ce39213 | 257 | |
237c4f2a | 258 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
635c9298 | 259 | skb->csum = csum_sub(skb->csum, csum_partial(skb->data |
af9d14a8 | 260 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
635c9298 | 261 | |
ceb176fd PS |
262 | vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN); |
263 | *current_tci = vhdr->h_vlan_TCI; | |
d9065a90 | 264 | |
6ce39213 | 265 | memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN); |
ceb176fd | 266 | __skb_pull(skb, VLAN_HLEN); |
064af421 | 267 | |
ceb176fd | 268 | vlan_set_encap_proto(skb, vhdr); |
064af421 | 269 | skb->mac_header += VLAN_HLEN; |
ccf43786 SH |
270 | /* Update mac_len for subsequent MPLS actions */ |
271 | skb->mac_len -= VLAN_HLEN; | |
064af421 | 272 | |
10db8b20 | 273 | return 0; |
064af421 BP |
274 | } |
275 | ||
d9065a90 | 276 | static int pop_vlan(struct sk_buff *skb) |
064af421 | 277 | { |
d9065a90 PS |
278 | __be16 tci; |
279 | int err; | |
10db8b20 | 280 | |
d9065a90 PS |
281 | if (likely(vlan_tx_tag_present(skb))) { |
282 | vlan_set_tci(skb, 0); | |
283 | } else { | |
284 | if (unlikely(skb->protocol != htons(ETH_P_8021Q) || | |
fb516ed8 | 285 | skb->len < VLAN_ETH_HLEN)) |
10db8b20 | 286 | return 0; |
064af421 | 287 | |
d9065a90 PS |
288 | err = __pop_vlan_tci(skb, &tci); |
289 | if (err) | |
10db8b20 | 290 | return err; |
064af421 | 291 | } |
d9065a90 PS |
292 | /* move next vlan tag to hw accel tag */ |
293 | if (likely(skb->protocol != htons(ETH_P_8021Q) || | |
e16138e2 PS |
294 | skb->len < VLAN_ETH_HLEN)) { |
295 | flow_key_set_vlan_tci(skb, 0); | |
d9065a90 | 296 | return 0; |
e16138e2 | 297 | } |
d9065a90 | 298 | |
e16138e2 | 299 | invalidate_skb_flow_key(skb); |
d9065a90 PS |
300 | err = __pop_vlan_tci(skb, &tci); |
301 | if (unlikely(err)) | |
302 | return err; | |
064af421 | 303 | |
9b764edf | 304 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci)); |
d9065a90 PS |
305 | return 0; |
306 | } | |
307 | ||
fea393b1 | 308 | static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan) |
d9065a90 PS |
309 | { |
310 | if (unlikely(vlan_tx_tag_present(skb))) { | |
311 | u16 current_tag; | |
312 | ||
313 | /* push down current VLAN tag */ | |
314 | current_tag = vlan_tx_tag_get(skb); | |
315 | ||
9b764edf | 316 | if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag)) |
d9065a90 | 317 | return -ENOMEM; |
10db8b20 | 318 | |
ccf43786 SH |
319 | /* Update mac_len for subsequent MPLS actions */ |
320 | skb->mac_len += VLAN_HLEN; | |
321 | ||
237c4f2a | 322 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
d9065a90 | 323 | skb->csum = csum_add(skb->csum, csum_partial(skb->data |
af9d14a8 | 324 | + (2 * ETH_ALEN), VLAN_HLEN, 0)); |
d9065a90 | 325 | |
e16138e2 PS |
326 | invalidate_skb_flow_key(skb); |
327 | } else { | |
328 | flow_key_set_vlan_tci(skb, vlan->vlan_tci); | |
d9065a90 | 329 | } |
9b764edf | 330 | __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT); |
10db8b20 | 331 | return 0; |
064af421 BP |
332 | } |
333 | ||
4edb9ae9 PS |
334 | static int set_eth_addr(struct sk_buff *skb, |
335 | const struct ovs_key_ethernet *eth_key) | |
ca78c6b6 | 336 | { |
4edb9ae9 PS |
337 | int err; |
338 | err = make_writable(skb, ETH_HLEN); | |
339 | if (unlikely(err)) | |
340 | return err; | |
341 | ||
237c4f2a | 342 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 343 | |
982a47ec JP |
344 | ether_addr_copy(eth_hdr(skb)->h_source, eth_key->eth_src); |
345 | ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst); | |
4edb9ae9 | 346 | |
237c4f2a | 347 | ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2); |
3cfede14 | 348 | |
e16138e2 PS |
349 | flow_key_set_eth_src(skb, eth_key->eth_src); |
350 | flow_key_set_eth_dst(skb, eth_key->eth_dst); | |
4edb9ae9 | 351 | return 0; |
ca78c6b6 BP |
352 | } |
353 | ||
4edb9ae9 | 354 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
e16138e2 | 355 | __be32 *addr, __be32 new_addr) |
ca78c6b6 BP |
356 | { |
357 | int transport_len = skb->len - skb_transport_offset(skb); | |
4edb9ae9 PS |
358 | |
359 | if (nh->protocol == IPPROTO_TCP) { | |
ca78c6b6 | 360 | if (likely(transport_len >= sizeof(struct tcphdr))) |
4edb9ae9 PS |
361 | inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb, |
362 | *addr, new_addr, 1); | |
363 | } else if (nh->protocol == IPPROTO_UDP) { | |
55ce87bc JG |
364 | if (likely(transport_len >= sizeof(struct udphdr))) { |
365 | struct udphdr *uh = udp_hdr(skb); | |
366 | ||
237c4f2a | 367 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
55ce87bc JG |
368 | inet_proto_csum_replace4(&uh->check, skb, |
369 | *addr, new_addr, 1); | |
370 | if (!uh->check) | |
371 | uh->check = CSUM_MANGLED_0; | |
372 | } | |
373 | } | |
ca78c6b6 | 374 | } |
4edb9ae9 PS |
375 | |
376 | csum_replace4(&nh->check, *addr, new_addr); | |
e2f3178f | 377 | skb_clear_hash(skb); |
4edb9ae9 | 378 | *addr = new_addr; |
ca78c6b6 BP |
379 | } |
380 | ||
bc7a5acd AA |
381 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
382 | __be32 addr[4], const __be32 new_addr[4]) | |
383 | { | |
384 | int transport_len = skb->len - skb_transport_offset(skb); | |
385 | ||
00894212 | 386 | if (l4_proto == NEXTHDR_TCP) { |
bc7a5acd AA |
387 | if (likely(transport_len >= sizeof(struct tcphdr))) |
388 | inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb, | |
389 | addr, new_addr, 1); | |
00894212 | 390 | } else if (l4_proto == NEXTHDR_UDP) { |
bc7a5acd AA |
391 | if (likely(transport_len >= sizeof(struct udphdr))) { |
392 | struct udphdr *uh = udp_hdr(skb); | |
393 | ||
237c4f2a | 394 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
bc7a5acd AA |
395 | inet_proto_csum_replace16(&uh->check, skb, |
396 | addr, new_addr, 1); | |
397 | if (!uh->check) | |
398 | uh->check = CSUM_MANGLED_0; | |
399 | } | |
400 | } | |
00894212 JG |
401 | } else if (l4_proto == NEXTHDR_ICMP) { |
402 | if (likely(transport_len >= sizeof(struct icmp6hdr))) | |
403 | inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum, | |
404 | skb, addr, new_addr, 1); | |
bc7a5acd AA |
405 | } |
406 | } | |
407 | ||
408 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, | |
409 | __be32 addr[4], const __be32 new_addr[4], | |
410 | bool recalculate_csum) | |
411 | { | |
51cf5e71 | 412 | if (likely(recalculate_csum)) |
bc7a5acd AA |
413 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); |
414 | ||
e2f3178f | 415 | skb_clear_hash(skb); |
bc7a5acd AA |
416 | memcpy(addr, new_addr, sizeof(__be32[4])); |
417 | } | |
418 | ||
419 | static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc) | |
420 | { | |
421 | nh->priority = tc >> 4; | |
422 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4); | |
423 | } | |
424 | ||
425 | static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl) | |
426 | { | |
427 | nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16; | |
428 | nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8; | |
429 | nh->flow_lbl[2] = fl & 0x000000FF; | |
430 | } | |
431 | ||
a61680c6 JP |
432 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl) |
433 | { | |
434 | csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); | |
435 | nh->ttl = new_ttl; | |
436 | } | |
437 | ||
4edb9ae9 | 438 | static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key) |
064af421 | 439 | { |
ca78c6b6 | 440 | struct iphdr *nh; |
10db8b20 | 441 | int err; |
ca78c6b6 | 442 | |
10db8b20 JG |
443 | err = make_writable(skb, skb_network_offset(skb) + |
444 | sizeof(struct iphdr)); | |
445 | if (unlikely(err)) | |
446 | return err; | |
ca78c6b6 BP |
447 | |
448 | nh = ip_hdr(skb); | |
ca78c6b6 | 449 | |
e16138e2 | 450 | if (ipv4_key->ipv4_src != nh->saddr) { |
4edb9ae9 | 451 | set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src); |
e16138e2 PS |
452 | flow_key_set_ipv4_src(skb, ipv4_key->ipv4_src); |
453 | } | |
ca78c6b6 | 454 | |
e16138e2 | 455 | if (ipv4_key->ipv4_dst != nh->daddr) { |
4edb9ae9 | 456 | set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst); |
e16138e2 PS |
457 | flow_key_set_ipv4_dst(skb, ipv4_key->ipv4_dst); |
458 | } | |
a4a26436 | 459 | |
e16138e2 | 460 | if (ipv4_key->ipv4_tos != nh->tos) { |
530180fd | 461 | ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos); |
e16138e2 PS |
462 | flow_key_set_ip_tos(skb, nh->tos); |
463 | } | |
ca78c6b6 | 464 | |
e16138e2 | 465 | if (ipv4_key->ipv4_ttl != nh->ttl) { |
a61680c6 | 466 | set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl); |
e16138e2 PS |
467 | flow_key_set_ip_ttl(skb, ipv4_key->ipv4_ttl); |
468 | } | |
a61680c6 | 469 | |
10db8b20 | 470 | return 0; |
064af421 BP |
471 | } |
472 | ||
bc7a5acd AA |
473 | static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key) |
474 | { | |
475 | struct ipv6hdr *nh; | |
476 | int err; | |
477 | __be32 *saddr; | |
478 | __be32 *daddr; | |
479 | ||
480 | err = make_writable(skb, skb_network_offset(skb) + | |
481 | sizeof(struct ipv6hdr)); | |
482 | if (unlikely(err)) | |
483 | return err; | |
484 | ||
485 | nh = ipv6_hdr(skb); | |
486 | saddr = (__be32 *)&nh->saddr; | |
487 | daddr = (__be32 *)&nh->daddr; | |
488 | ||
e16138e2 | 489 | if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) { |
bc7a5acd AA |
490 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr, |
491 | ipv6_key->ipv6_src, true); | |
e16138e2 PS |
492 | flow_key_set_ipv6_src(skb, ipv6_key->ipv6_src); |
493 | } | |
bc7a5acd AA |
494 | |
495 | if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) { | |
496 | unsigned int offset = 0; | |
497 | int flags = OVS_IP6T_FH_F_SKIP_RH; | |
498 | bool recalc_csum = true; | |
499 | ||
500 | if (ipv6_ext_hdr(nh->nexthdr)) | |
501 | recalc_csum = ipv6_find_hdr(skb, &offset, | |
502 | NEXTHDR_ROUTING, NULL, | |
503 | &flags) != NEXTHDR_ROUTING; | |
504 | ||
505 | set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr, | |
506 | ipv6_key->ipv6_dst, recalc_csum); | |
e16138e2 | 507 | flow_key_set_ipv6_dst(skb, ipv6_key->ipv6_dst); |
bc7a5acd AA |
508 | } |
509 | ||
510 | set_ipv6_tc(nh, ipv6_key->ipv6_tclass); | |
e16138e2 PS |
511 | flow_key_set_ip_tos(skb, ipv6_get_dsfield(nh)); |
512 | ||
bc7a5acd | 513 | set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label)); |
e16138e2 | 514 | flow_key_set_ipv6_fl(skb, nh); |
bc7a5acd | 515 | |
e16138e2 PS |
516 | nh->hop_limit = ipv6_key->ipv6_hlimit; |
517 | flow_key_set_ip_ttl(skb, ipv6_key->ipv6_hlimit); | |
bc7a5acd AA |
518 | return 0; |
519 | } | |
520 | ||
4edb9ae9 PS |
521 | /* Must follow make_writable() since that can move the skb data. */ |
522 | static void set_tp_port(struct sk_buff *skb, __be16 *port, | |
523 | __be16 new_port, __sum16 *check) | |
959a2ecd | 524 | { |
4edb9ae9 PS |
525 | inet_proto_csum_replace2(check, skb, *port, new_port, 0); |
526 | *port = new_port; | |
e2f3178f | 527 | skb_clear_hash(skb); |
4edb9ae9 | 528 | } |
10db8b20 | 529 | |
55ce87bc JG |
530 | static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port) |
531 | { | |
532 | struct udphdr *uh = udp_hdr(skb); | |
533 | ||
237c4f2a | 534 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
55ce87bc JG |
535 | set_tp_port(skb, port, new_port, &uh->check); |
536 | ||
537 | if (!uh->check) | |
538 | uh->check = CSUM_MANGLED_0; | |
539 | } else { | |
540 | *port = new_port; | |
e2f3178f | 541 | skb_clear_hash(skb); |
55ce87bc JG |
542 | } |
543 | } | |
544 | ||
545 | static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key) | |
4edb9ae9 PS |
546 | { |
547 | struct udphdr *uh; | |
548 | int err; | |
10db8b20 | 549 | |
4edb9ae9 PS |
550 | err = make_writable(skb, skb_transport_offset(skb) + |
551 | sizeof(struct udphdr)); | |
10db8b20 JG |
552 | if (unlikely(err)) |
553 | return err; | |
554 | ||
4edb9ae9 | 555 | uh = udp_hdr(skb); |
e16138e2 | 556 | if (udp_port_key->udp_src != uh->source) { |
55ce87bc | 557 | set_udp_port(skb, &uh->source, udp_port_key->udp_src); |
e16138e2 PS |
558 | flow_key_set_tp_src(skb, udp_port_key->udp_src); |
559 | } | |
4edb9ae9 | 560 | |
e16138e2 | 561 | if (udp_port_key->udp_dst != uh->dest) { |
55ce87bc | 562 | set_udp_port(skb, &uh->dest, udp_port_key->udp_dst); |
e16138e2 PS |
563 | flow_key_set_tp_dst(skb, udp_port_key->udp_dst); |
564 | } | |
10db8b20 JG |
565 | |
566 | return 0; | |
959a2ecd JP |
567 | } |
568 | ||
55ce87bc | 569 | static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key) |
064af421 | 570 | { |
4edb9ae9 | 571 | struct tcphdr *th; |
10db8b20 | 572 | int err; |
064af421 | 573 | |
10db8b20 JG |
574 | err = make_writable(skb, skb_transport_offset(skb) + |
575 | sizeof(struct tcphdr)); | |
576 | if (unlikely(err)) | |
577 | return err; | |
ca78c6b6 | 578 | |
4edb9ae9 | 579 | th = tcp_hdr(skb); |
e16138e2 | 580 | if (tcp_port_key->tcp_src != th->source) { |
4edb9ae9 | 581 | set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check); |
e16138e2 PS |
582 | flow_key_set_tp_src(skb, tcp_port_key->tcp_src); |
583 | } | |
064af421 | 584 | |
e16138e2 | 585 | if (tcp_port_key->tcp_dst != th->dest) { |
4edb9ae9 | 586 | set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check); |
e16138e2 PS |
587 | flow_key_set_tp_dst(skb, tcp_port_key->tcp_dst); |
588 | } | |
ca78c6b6 | 589 | |
10db8b20 | 590 | return 0; |
064af421 BP |
591 | } |
592 | ||
10f72e3d | 593 | static int set_sctp(struct sk_buff *skb, |
e16138e2 | 594 | const struct ovs_key_sctp *sctp_port_key) |
10f72e3d JS |
595 | { |
596 | struct sctphdr *sh; | |
597 | int err; | |
598 | unsigned int sctphoff = skb_transport_offset(skb); | |
599 | ||
600 | err = make_writable(skb, sctphoff + sizeof(struct sctphdr)); | |
601 | if (unlikely(err)) | |
602 | return err; | |
603 | ||
604 | sh = sctp_hdr(skb); | |
605 | if (sctp_port_key->sctp_src != sh->source || | |
606 | sctp_port_key->sctp_dst != sh->dest) { | |
607 | __le32 old_correct_csum, new_csum, old_csum; | |
608 | ||
609 | old_csum = sh->checksum; | |
610 | old_correct_csum = sctp_compute_cksum(skb, sctphoff); | |
611 | ||
612 | sh->source = sctp_port_key->sctp_src; | |
613 | sh->dest = sctp_port_key->sctp_dst; | |
614 | ||
615 | new_csum = sctp_compute_cksum(skb, sctphoff); | |
616 | ||
617 | /* Carry any checksum errors through. */ | |
618 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; | |
619 | ||
e2f3178f | 620 | skb_clear_hash(skb); |
e16138e2 PS |
621 | flow_key_set_tp_src(skb, sctp_port_key->sctp_src); |
622 | flow_key_set_tp_dst(skb, sctp_port_key->sctp_dst); | |
10f72e3d JS |
623 | } |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
fe90efd9 | 628 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port) |
064af421 | 629 | { |
fe90efd9 | 630 | struct vport *vport = ovs_vport_rcu(dp, out_port); |
064af421 | 631 | |
fe90efd9 AZ |
632 | if (likely(vport)) |
633 | ovs_vport_send(vport, skb); | |
634 | else | |
f15c8639 | 635 | kfree_skb(skb); |
064af421 BP |
636 | } |
637 | ||
98403001 BP |
638 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, |
639 | const struct nlattr *attr) | |
064af421 | 640 | { |
856081f6 | 641 | struct dp_upcall_info upcall; |
98403001 BP |
642 | const struct nlattr *a; |
643 | int rem; | |
8b7ea2d4 | 644 | struct ovs_tunnel_info info; |
856081f6 | 645 | |
df2c07f4 | 646 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
98403001 | 647 | upcall.userdata = NULL; |
28aea917 | 648 | upcall.portid = 0; |
8b7ea2d4 | 649 | upcall.egress_tun_info = NULL; |
98403001 BP |
650 | |
651 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
652 | a = nla_next(a, &rem)) { | |
653 | switch (nla_type(a)) { | |
654 | case OVS_USERSPACE_ATTR_USERDATA: | |
655 | upcall.userdata = a; | |
656 | break; | |
657 | ||
658 | case OVS_USERSPACE_ATTR_PID: | |
28aea917 | 659 | upcall.portid = nla_get_u32(a); |
98403001 | 660 | break; |
8b7ea2d4 WZ |
661 | |
662 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { | |
663 | /* Get out tunnel info. */ | |
664 | struct vport *vport; | |
665 | ||
666 | vport = ovs_vport_rcu(dp, nla_get_u32(a)); | |
667 | if (vport) { | |
668 | int err; | |
669 | ||
670 | err = ovs_vport_get_egress_tun_info(vport, skb, | |
671 | &info); | |
672 | if (!err) | |
673 | upcall.egress_tun_info = &info; | |
674 | } | |
675 | break; | |
98403001 | 676 | } |
8b7ea2d4 WZ |
677 | |
678 | } /* End of switch. */ | |
98403001 BP |
679 | } |
680 | ||
850b6b3b | 681 | return ovs_dp_upcall(dp, skb, &upcall); |
064af421 BP |
682 | } |
683 | ||
fbf4f74d SH |
684 | static bool last_action(const struct nlattr *a, int rem) |
685 | { | |
686 | return a->nla_len == rem; | |
687 | } | |
688 | ||
6ff686f2 | 689 | static int sample(struct datapath *dp, struct sk_buff *skb, |
85c9de19 | 690 | const struct nlattr *attr) |
6ff686f2 | 691 | { |
e16138e2 | 692 | struct sw_flow_key sample_key; |
6ff686f2 PS |
693 | const struct nlattr *acts_list = NULL; |
694 | const struct nlattr *a; | |
695 | int rem; | |
696 | ||
697 | for (a = nla_data(attr), rem = nla_len(attr); rem > 0; | |
698 | a = nla_next(a, &rem)) { | |
699 | switch (nla_type(a)) { | |
700 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
e2f3178f | 701 | if (prandom_u32() >= nla_get_u32(a)) |
6ff686f2 PS |
702 | return 0; |
703 | break; | |
704 | ||
705 | case OVS_SAMPLE_ATTR_ACTIONS: | |
706 | acts_list = a; | |
707 | break; | |
708 | } | |
709 | } | |
710 | ||
fbf4f74d SH |
711 | rem = nla_len(acts_list); |
712 | a = nla_data(acts_list); | |
713 | ||
d7ff93d7 AZ |
714 | /* Actions list is empty, do nothing */ |
715 | if (unlikely(!rem)) | |
716 | return 0; | |
e16138e2 | 717 | |
d7ff93d7 AZ |
718 | /* The only known usage of sample action is having a single user-space |
719 | * action. Treat this usage as a special case. | |
720 | * The output_userspace() should clone the skb to be sent to the | |
721 | * user space. This skb will be consumed by its caller. */ | |
722 | if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE && | |
723 | last_action(a, rem))) | |
724 | return output_userspace(dp, skb, a); | |
725 | ||
726 | skb = skb_clone(skb, GFP_ATOMIC); | |
727 | if (!skb) | |
728 | /* Skip the sample action when out of memory. */ | |
729 | return 0; | |
730 | ||
731 | flow_key_clone(skb, &sample_key); | |
fbf4f74d | 732 | |
d7ff93d7 AZ |
733 | /* do_execute_actions() will consume the cloned skb. */ |
734 | return do_execute_actions(dp, skb, a, rem); | |
6ff686f2 PS |
735 | } |
736 | ||
7804df20 AZ |
737 | static void execute_hash(struct sk_buff *skb, const struct nlattr *attr) |
738 | { | |
739 | struct sw_flow_key *key = OVS_CB(skb)->pkt_key; | |
740 | struct ovs_action_hash *hash_act = nla_data(attr); | |
741 | u32 hash = 0; | |
742 | ||
743 | /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */ | |
e2f3178f | 744 | hash = skb_get_hash(skb); |
7804df20 AZ |
745 | hash = jhash_1word(hash, hash_act->hash_basis); |
746 | if (!hash) | |
747 | hash = 0x1; | |
748 | ||
749 | key->ovs_flow_hash = hash; | |
750 | } | |
751 | ||
4edb9ae9 | 752 | static int execute_set_action(struct sk_buff *skb, |
85c9de19 | 753 | const struct nlattr *nested_attr) |
4edb9ae9 | 754 | { |
15c39847 | 755 | int err = 0; |
4edb9ae9 PS |
756 | |
757 | switch (nla_type(nested_attr)) { | |
abff858b PS |
758 | case OVS_KEY_ATTR_PRIORITY: |
759 | skb->priority = nla_get_u32(nested_attr); | |
e16138e2 | 760 | flow_key_set_priority(skb, skb->priority); |
abff858b PS |
761 | break; |
762 | ||
72e8bf28 | 763 | case OVS_KEY_ATTR_SKB_MARK: |
3025a772 | 764 | skb->mark = nla_get_u32(nested_attr); |
e16138e2 | 765 | flow_key_set_skb_mark(skb, skb->mark); |
72e8bf28 AA |
766 | break; |
767 | ||
f0cd669f | 768 | case OVS_KEY_ATTR_TUNNEL_INFO: |
fb66fbd1 | 769 | OVS_CB(skb)->egress_tun_info = nla_data(nested_attr); |
4edb9ae9 PS |
770 | break; |
771 | ||
772 | case OVS_KEY_ATTR_ETHERNET: | |
773 | err = set_eth_addr(skb, nla_data(nested_attr)); | |
774 | break; | |
775 | ||
776 | case OVS_KEY_ATTR_IPV4: | |
777 | err = set_ipv4(skb, nla_data(nested_attr)); | |
778 | break; | |
779 | ||
bc7a5acd AA |
780 | case OVS_KEY_ATTR_IPV6: |
781 | err = set_ipv6(skb, nla_data(nested_attr)); | |
782 | break; | |
783 | ||
4edb9ae9 | 784 | case OVS_KEY_ATTR_TCP: |
55ce87bc | 785 | err = set_tcp(skb, nla_data(nested_attr)); |
4edb9ae9 PS |
786 | break; |
787 | ||
788 | case OVS_KEY_ATTR_UDP: | |
55ce87bc | 789 | err = set_udp(skb, nla_data(nested_attr)); |
4edb9ae9 | 790 | break; |
10f72e3d JS |
791 | |
792 | case OVS_KEY_ATTR_SCTP: | |
793 | err = set_sctp(skb, nla_data(nested_attr)); | |
794 | break; | |
ccf43786 SH |
795 | |
796 | case OVS_KEY_ATTR_MPLS: | |
797 | err = set_mpls(skb, nla_data(nested_attr)); | |
798 | break; | |
4edb9ae9 | 799 | } |
15c39847 | 800 | |
4edb9ae9 PS |
801 | return err; |
802 | } | |
803 | ||
e16138e2 | 804 | |
a6059080 | 805 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
e16138e2 | 806 | const struct nlattr *a, int rem) |
a6059080 AZ |
807 | { |
808 | struct sw_flow_key recirc_key; | |
867e37ba AZ |
809 | |
810 | if (!is_skb_flow_key_valid(skb)) { | |
811 | int err; | |
812 | ||
813 | err = ovs_flow_key_update(skb, OVS_CB(skb)->pkt_key); | |
814 | if (err) | |
815 | return err; | |
816 | ||
817 | } | |
818 | BUG_ON(!is_skb_flow_key_valid(skb)); | |
a6059080 | 819 | |
e16138e2 PS |
820 | if (!last_action(a, rem)) { |
821 | /* Recirc action is the not the last action | |
822 | * of the action list. */ | |
823 | skb = skb_clone(skb, GFP_ATOMIC); | |
824 | ||
825 | /* Skip the recirc action when out of memory, but | |
826 | * continue on with the rest of the action list. */ | |
827 | if (!skb) | |
828 | return 0; | |
a6059080 | 829 | |
e0a42ae2 | 830 | flow_key_clone(skb, &recirc_key); |
867e37ba | 831 | } |
a6059080 | 832 | |
e0a42ae2 | 833 | flow_key_set_recirc_id(skb, nla_get_u32(a)); |
e16138e2 | 834 | ovs_dp_process_packet(skb, true); |
a6059080 AZ |
835 | return 0; |
836 | } | |
837 | ||
064af421 | 838 | /* Execute a list of actions against 'skb'. */ |
871dfe07 | 839 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
fbf4f74d | 840 | const struct nlattr *attr, int len) |
064af421 BP |
841 | { |
842 | /* Every output action needs a separate clone of 'skb', but the common | |
843 | * case is just a single output action, so that doing a clone and | |
844 | * then freeing the original skbuff is wasteful. So the following code | |
845 | * is slightly obscure just to avoid that. */ | |
846 | int prev_port = -1; | |
cdee00fd | 847 | const struct nlattr *a; |
10db8b20 | 848 | int rem; |
72b06300 | 849 | |
6ff686f2 | 850 | for (a = attr, rem = len; rem > 0; |
a4af2475 | 851 | a = nla_next(a, &rem)) { |
10db8b20 JG |
852 | int err = 0; |
853 | ||
fe90efd9 AZ |
854 | if (unlikely(prev_port != -1)) { |
855 | struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC); | |
856 | ||
857 | if (out_skb) | |
858 | do_output(dp, out_skb, prev_port); | |
859 | ||
064af421 BP |
860 | prev_port = -1; |
861 | } | |
862 | ||
cdee00fd | 863 | switch (nla_type(a)) { |
df2c07f4 | 864 | case OVS_ACTION_ATTR_OUTPUT: |
cdee00fd | 865 | prev_port = nla_get_u32(a); |
064af421 BP |
866 | break; |
867 | ||
df2c07f4 | 868 | case OVS_ACTION_ATTR_USERSPACE: |
98403001 | 869 | output_userspace(dp, skb, a); |
064af421 | 870 | break; |
7804df20 AZ |
871 | |
872 | case OVS_ACTION_ATTR_HASH: | |
873 | execute_hash(skb, a); | |
874 | break; | |
064af421 | 875 | |
ccf43786 SH |
876 | case OVS_ACTION_ATTR_PUSH_MPLS: |
877 | err = push_mpls(skb, nla_data(a)); | |
878 | break; | |
879 | ||
880 | case OVS_ACTION_ATTR_POP_MPLS: | |
881 | err = pop_mpls(skb, nla_get_be16(a)); | |
882 | break; | |
883 | ||
fea393b1 BP |
884 | case OVS_ACTION_ATTR_PUSH_VLAN: |
885 | err = push_vlan(skb, nla_data(a)); | |
4edb9ae9 | 886 | if (unlikely(err)) /* skb already freed. */ |
d9065a90 | 887 | return err; |
064af421 BP |
888 | break; |
889 | ||
fea393b1 | 890 | case OVS_ACTION_ATTR_POP_VLAN: |
d9065a90 | 891 | err = pop_vlan(skb); |
064af421 BP |
892 | break; |
893 | ||
e16138e2 PS |
894 | case OVS_ACTION_ATTR_RECIRC: |
895 | err = execute_recirc(dp, skb, a, rem); | |
867e37ba AZ |
896 | if (last_action(a, rem)) { |
897 | /* If this is the last action, the skb has | |
898 | * been consumed or freed. | |
899 | * Return immediately. */ | |
900 | return err; | |
901 | } | |
a6059080 | 902 | break; |
a6059080 | 903 | |
4edb9ae9 | 904 | case OVS_ACTION_ATTR_SET: |
85c9de19 | 905 | err = execute_set_action(skb, nla_data(a)); |
064af421 | 906 | break; |
c1c9c9c4 | 907 | |
6ff686f2 | 908 | case OVS_ACTION_ATTR_SAMPLE: |
85c9de19 | 909 | err = sample(dp, skb, a); |
6ff686f2 | 910 | break; |
6ff686f2 | 911 | } |
15c39847 | 912 | |
10db8b20 JG |
913 | if (unlikely(err)) { |
914 | kfree_skb(skb); | |
915 | return err; | |
916 | } | |
064af421 | 917 | } |
6c222e55 | 918 | |
fbf4f74d | 919 | if (prev_port != -1) |
064af421 | 920 | do_output(dp, skb, prev_port); |
fbf4f74d | 921 | else |
5b95ab0e | 922 | consume_skb(skb); |
10db8b20 | 923 | |
a5225dd6 | 924 | return 0; |
064af421 | 925 | } |
871dfe07 | 926 | |
e9141eec | 927 | /* We limit the number of times that we pass into execute_actions() |
ca93abce AZ |
928 | * to avoid blowing out the stack in the event that we have a loop. |
929 | * | |
930 | * Each loop adds some (estimated) cost to the kernel stack. | |
931 | * The loop terminates when the max cost is exceeded. | |
932 | * */ | |
933 | #define RECIRC_STACK_COST 1 | |
934 | #define DEFAULT_STACK_COST 4 | |
935 | /* Allow up to 4 regular services, and up to 3 recirculations */ | |
936 | #define MAX_STACK_COST (DEFAULT_STACK_COST * 4 + RECIRC_STACK_COST * 3) | |
e9141eec PS |
937 | |
938 | struct loop_counter { | |
ca93abce | 939 | u8 stack_cost; /* loop stack cost. */ |
e9141eec PS |
940 | bool looping; /* Loop detected? */ |
941 | }; | |
942 | ||
943 | static DEFINE_PER_CPU(struct loop_counter, loop_counters); | |
944 | ||
945 | static int loop_suppress(struct datapath *dp, struct sw_flow_actions *actions) | |
946 | { | |
947 | if (net_ratelimit()) | |
ca93abce AZ |
948 | pr_warn("%s: flow loop detected, dropping\n", |
949 | ovs_dp_name(dp)); | |
e9141eec PS |
950 | actions->actions_len = 0; |
951 | return -ELOOP; | |
952 | } | |
953 | ||
871dfe07 | 954 | /* Execute a list of actions against 'skb'. */ |
ad50cb60 LJ |
955 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
956 | struct sw_flow_actions *acts, bool recirc) | |
871dfe07 | 957 | { |
ca93abce | 958 | const u8 stack_cost = recirc ? RECIRC_STACK_COST : DEFAULT_STACK_COST; |
a4af2475 BP |
959 | struct loop_counter *loop; |
960 | int error; | |
961 | ||
962 | /* Check whether we've looped too much. */ | |
e9141eec | 963 | loop = &__get_cpu_var(loop_counters); |
ca93abce AZ |
964 | loop->stack_cost += stack_cost; |
965 | if (unlikely(loop->stack_cost > MAX_STACK_COST)) | |
a4af2475 BP |
966 | loop->looping = true; |
967 | if (unlikely(loop->looping)) { | |
968 | error = loop_suppress(dp, acts); | |
969 | kfree_skb(skb); | |
970 | goto out_loop; | |
971 | } | |
871dfe07 | 972 | |
fbf4f74d | 973 | error = do_execute_actions(dp, skb, acts->actions, acts->actions_len); |
a4af2475 BP |
974 | |
975 | /* Check whether sub-actions looped too much. */ | |
976 | if (unlikely(loop->looping)) | |
977 | error = loop_suppress(dp, acts); | |
978 | ||
979 | out_loop: | |
ca93abce AZ |
980 | /* Decrement loop stack cost. */ |
981 | loop->stack_cost -= stack_cost; | |
982 | if (!loop->stack_cost) | |
a4af2475 | 983 | loop->looping = false; |
871dfe07 | 984 | |
a4af2475 | 985 | return error; |
871dfe07 | 986 | } |