1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2007-2017 Nicira, Inc. |
4 | */ |
5 | |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
7 | |
8 | #include <linux/skbuff.h> |
9 | #include <linux/in.h> |
10 | #include <linux/ip.h> |
11 | #include <linux/openvswitch.h> |
12 | #include <linux/sctp.h> |
13 | #include <linux/tcp.h> |
14 | #include <linux/udp.h> |
15 | #include <linux/in6.h> |
16 | #include <linux/if_arp.h> |
17 | #include <linux/if_vlan.h> |
18 | |
19 | #include <net/dst.h> |
20 | #include <net/gso.h> |
21 | #include <net/ip.h> |
22 | #include <net/ipv6.h> |
23 | #include <net/ip6_fib.h> |
24 | #include <net/checksum.h> |
25 | #include <net/dsfield.h> |
26 | #include <net/mpls.h> |
27 | #include <net/sctp/checksum.h> |
28 | |
29 | #include "datapath.h" |
30 | #include "drop.h" |
31 | #include "flow.h" |
32 | #include "conntrack.h" |
33 | #include "vport.h" |
34 | #include "flow_netlink.h" |
35 | #include "openvswitch_trace.h" |
36 | |
37 | struct deferred_action { |
38 | struct sk_buff *skb; |
39 | const struct nlattr *actions; |
40 | int actions_len; |
41 | |
42 | /* Store pkt_key clone when creating deferred action. */ |
43 | struct sw_flow_key pkt_key; |
44 | }; |
45 | |
46 | #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN) |
47 | struct ovs_frag_data { |
48 | unsigned long dst; |
49 | struct vport *vport; |
50 | struct ovs_skb_cb cb; |
51 | __be16 inner_protocol; |
52 | u16 network_offset; /* valid only for MPLS */ |
53 | u16 vlan_tci; |
54 | __be16 vlan_proto; |
55 | unsigned int l2_len; |
56 | u8 mac_proto; |
57 | u8 l2_data[MAX_L2_LEN]; |
58 | }; |
59 | |
60 | static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage); |
61 | |
62 | #define DEFERRED_ACTION_FIFO_SIZE 10 |
63 | #define OVS_RECURSION_LIMIT 5 |
64 | #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2) |
65 | struct action_fifo { |
66 | int head; |
67 | int tail; |
68 | /* Deferred action fifo queue storage. */ |
69 | struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE]; |
70 | }; |
71 | |
72 | struct action_flow_keys { |
73 | struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD]; |
74 | }; |
75 | |
76 | static struct action_fifo __percpu *action_fifos; |
77 | static struct action_flow_keys __percpu *flow_keys; |
78 | static DEFINE_PER_CPU(int, exec_actions_level); |
79 | |
80 | /* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys' |
81 | * space. Return NULL if out of key spaces. |
82 | */ |
83 | static struct sw_flow_key *clone_key(const struct sw_flow_key *key_) |
84 | { |
85 | struct action_flow_keys *keys = this_cpu_ptr(flow_keys); |
86 | int level = this_cpu_read(exec_actions_level); |
87 | struct sw_flow_key *key = NULL; |
88 | |
89 | if (level <= OVS_DEFERRED_ACTION_THRESHOLD) { |
90 | key = &keys->key[level - 1]; |
91 | *key = *key_; |
92 | } |
93 | |
94 | return key; |
95 | } |
96 | |
97 | static void action_fifo_init(struct action_fifo *fifo) |
98 | { |
99 | fifo->head = 0; |
100 | fifo->tail = 0; |
101 | } |
102 | |
103 | static bool action_fifo_is_empty(const struct action_fifo *fifo) |
104 | { |
105 | return (fifo->head == fifo->tail); |
106 | } |
107 | |
108 | static struct deferred_action *action_fifo_get(struct action_fifo *fifo) |
109 | { |
110 | if (action_fifo_is_empty(fifo)) |
111 | return NULL; |
112 | |
113 | return &fifo->fifo[fifo->tail++]; |
114 | } |
115 | |
116 | static struct deferred_action *action_fifo_put(struct action_fifo *fifo) |
117 | { |
118 | if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1) |
119 | return NULL; |
120 | |
121 | return &fifo->fifo[fifo->head++]; |
122 | } |
123 | |
124 | /* Return true if fifo is not full */ |
125 | static struct deferred_action *add_deferred_actions(struct sk_buff *skb, |
126 | const struct sw_flow_key *key, |
127 | const struct nlattr *actions, |
128 | const int actions_len) |
129 | { |
130 | struct action_fifo *fifo; |
131 | struct deferred_action *da; |
132 | |
133 | fifo = this_cpu_ptr(action_fifos); |
134 | da = action_fifo_put(fifo); |
135 | if (da) { |
136 | da->skb = skb; |
137 | da->actions = actions; |
138 | da->actions_len = actions_len; |
139 | da->pkt_key = *key; |
140 | } |
141 | |
142 | return da; |
143 | } |
144 | |
145 | static void invalidate_flow_key(struct sw_flow_key *key) |
146 | { |
147 | key->mac_proto |= SW_FLOW_KEY_INVALID; |
148 | } |
149 | |
150 | static bool is_flow_key_valid(const struct sw_flow_key *key) |
151 | { |
152 | return !(key->mac_proto & SW_FLOW_KEY_INVALID); |
153 | } |
154 | |
155 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, |
156 | struct sw_flow_key *key, |
157 | u32 recirc_id, |
158 | const struct nlattr *actions, int len, |
159 | bool last, bool clone_flow_key); |
160 | |
161 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
162 | struct sw_flow_key *key, |
163 | const struct nlattr *attr, int len); |
164 | |
165 | static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
166 | __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len) |
167 | { |
168 | int err; |
169 | |
170 | err = skb_mpls_push(skb, mpls_lse, mpls_proto: mpls_ethertype, mac_len, ethernet: !!mac_len); |
171 | if (err) |
172 | return err; |
173 | |
174 | if (!mac_len) |
175 | key->mac_proto = MAC_PROTO_NONE; |
176 | |
177 | invalidate_flow_key(key); |
178 | return 0; |
179 | } |
180 | |
181 | static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key, |
182 | const __be16 ethertype) |
183 | { |
184 | int err; |
185 | |
186 | err = skb_mpls_pop(skb, next_proto: ethertype, mac_len: skb->mac_len, |
187 | ethernet: ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET); |
188 | if (err) |
189 | return err; |
190 | |
191 | if (ethertype == htons(ETH_P_TEB)) |
192 | key->mac_proto = MAC_PROTO_ETHERNET; |
193 | |
194 | invalidate_flow_key(key); |
195 | return 0; |
196 | } |
197 | |
198 | static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key, |
199 | const __be32 *mpls_lse, const __be32 *mask) |
200 | { |
201 | struct mpls_shim_hdr *stack; |
202 | __be32 lse; |
203 | int err; |
204 | |
205 | if (!pskb_may_pull(skb, len: skb_network_offset(skb) + MPLS_HLEN)) |
206 | return -ENOMEM; |
207 | |
208 | stack = mpls_hdr(skb); |
209 | lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask); |
210 | err = skb_mpls_update_lse(skb, mpls_lse: lse); |
211 | if (err) |
212 | return err; |
213 | |
214 | flow_key->mpls.lse[0] = lse; |
215 | return 0; |
216 | } |
217 | |
218 | static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key) |
219 | { |
220 | int err; |
221 | |
222 | err = skb_vlan_pop(skb); |
223 | if (skb_vlan_tag_present(skb)) { |
224 | invalidate_flow_key(key); |
225 | } else { |
226 | key->eth.vlan.tci = 0; |
227 | key->eth.vlan.tpid = 0; |
228 | } |
229 | return err; |
230 | } |
231 | |
232 | static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key, |
233 | const struct ovs_action_push_vlan *vlan) |
234 | { |
235 | if (skb_vlan_tag_present(skb)) { |
236 | invalidate_flow_key(key); |
237 | } else { |
238 | key->eth.vlan.tci = vlan->vlan_tci; |
239 | key->eth.vlan.tpid = vlan->vlan_tpid; |
240 | } |
241 | return skb_vlan_push(skb, vlan_proto: vlan->vlan_tpid, |
242 | ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK); |
243 | } |
244 | |
245 | /* 'src' is already properly masked. */ |
246 | static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_) |
247 | { |
248 | u16 *dst = (u16 *)dst_; |
249 | const u16 *src = (const u16 *)src_; |
250 | const u16 *mask = (const u16 *)mask_; |
251 | |
252 | OVS_SET_MASKED(dst[0], src[0], mask[0]); |
253 | OVS_SET_MASKED(dst[1], src[1], mask[1]); |
254 | OVS_SET_MASKED(dst[2], src[2], mask[2]); |
255 | } |
256 | |
257 | static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key, |
258 | const struct ovs_key_ethernet *key, |
259 | const struct ovs_key_ethernet *mask) |
260 | { |
261 | int err; |
262 | |
263 | err = skb_ensure_writable(skb, ETH_HLEN); |
264 | if (unlikely(err)) |
265 | return err; |
266 | |
267 | skb_postpull_rcsum(skb, start: eth_hdr(skb), ETH_ALEN * 2); |
268 | |
269 | ether_addr_copy_masked(dst_: eth_hdr(skb)->h_source, src_: key->eth_src, |
270 | mask_: mask->eth_src); |
271 | ether_addr_copy_masked(dst_: eth_hdr(skb)->h_dest, src_: key->eth_dst, |
272 | mask_: mask->eth_dst); |
273 | |
274 | skb_postpush_rcsum(skb, start: eth_hdr(skb), ETH_ALEN * 2); |
275 | |
276 | ether_addr_copy(dst: flow_key->eth.src, src: eth_hdr(skb)->h_source); |
277 | ether_addr_copy(dst: flow_key->eth.dst, src: eth_hdr(skb)->h_dest); |
278 | return 0; |
279 | } |
280 | |
281 | /* pop_eth does not support VLAN packets as this action is never called |
282 | * for them. |
283 | */ |
284 | static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key) |
285 | { |
286 | int err; |
287 | |
288 | err = skb_eth_pop(skb); |
289 | if (err) |
290 | return err; |
291 | |
292 | /* safe right before invalidate_flow_key */ |
293 | key->mac_proto = MAC_PROTO_NONE; |
294 | invalidate_flow_key(key); |
295 | return 0; |
296 | } |
297 | |
298 | static int push_eth(struct sk_buff *skb, struct sw_flow_key *key, |
299 | const struct ovs_action_push_eth *ethh) |
300 | { |
301 | int err; |
302 | |
303 | err = skb_eth_push(skb, dst: ethh->addresses.eth_dst, |
304 | src: ethh->addresses.eth_src); |
305 | if (err) |
306 | return err; |
307 | |
308 | /* safe right before invalidate_flow_key */ |
309 | key->mac_proto = MAC_PROTO_ETHERNET; |
310 | invalidate_flow_key(key); |
311 | return 0; |
312 | } |
313 | |
314 | static noinline_for_stack int push_nsh(struct sk_buff *skb, |
315 | struct sw_flow_key *key, |
316 | const struct nlattr *a) |
317 | { |
318 | u8 buffer[NSH_HDR_MAX_LEN]; |
319 | struct nshhdr *nh = (struct nshhdr *)buffer; |
320 | int err; |
321 | |
322 | err = nsh_hdr_from_nlattr(attr: a, nh, NSH_HDR_MAX_LEN); |
323 | if (err) |
324 | return err; |
325 | |
326 | err = nsh_push(skb, pushed_nh: nh); |
327 | if (err) |
328 | return err; |
329 | |
330 | /* safe right before invalidate_flow_key */ |
331 | key->mac_proto = MAC_PROTO_NONE; |
332 | invalidate_flow_key(key); |
333 | return 0; |
334 | } |
335 | |
336 | static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key) |
337 | { |
338 | int err; |
339 | |
340 | err = nsh_pop(skb); |
341 | if (err) |
342 | return err; |
343 | |
344 | /* safe right before invalidate_flow_key */ |
345 | if (skb->protocol == htons(ETH_P_TEB)) |
346 | key->mac_proto = MAC_PROTO_ETHERNET; |
347 | else |
348 | key->mac_proto = MAC_PROTO_NONE; |
349 | invalidate_flow_key(key); |
350 | return 0; |
351 | } |
352 | |
353 | static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh, |
354 | __be32 addr, __be32 new_addr) |
355 | { |
356 | int transport_len = skb->len - skb_transport_offset(skb); |
357 | |
358 | if (nh->frag_off & htons(IP_OFFSET)) |
359 | return; |
360 | |
361 | if (nh->protocol == IPPROTO_TCP) { |
362 | if (likely(transport_len >= sizeof(struct tcphdr))) |
363 | inet_proto_csum_replace4(sum: &tcp_hdr(skb)->check, skb, |
364 | from: addr, to: new_addr, pseudohdr: true); |
365 | } else if (nh->protocol == IPPROTO_UDP) { |
366 | if (likely(transport_len >= sizeof(struct udphdr))) { |
367 | struct udphdr *uh = udp_hdr(skb); |
368 | |
369 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
370 | inet_proto_csum_replace4(sum: &uh->check, skb, |
371 | from: addr, to: new_addr, pseudohdr: true); |
372 | if (!uh->check) |
373 | uh->check = CSUM_MANGLED_0; |
374 | } |
375 | } |
376 | } |
377 | } |
378 | |
379 | static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, |
380 | __be32 *addr, __be32 new_addr) |
381 | { |
382 | update_ip_l4_checksum(skb, nh, addr: *addr, new_addr); |
383 | csum_replace4(sum: &nh->check, from: *addr, to: new_addr); |
384 | skb_clear_hash(skb); |
385 | ovs_ct_clear(skb, NULL); |
386 | *addr = new_addr; |
387 | } |
388 | |
389 | static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto, |
390 | __be32 addr[4], const __be32 new_addr[4]) |
391 | { |
392 | int transport_len = skb->len - skb_transport_offset(skb); |
393 | |
394 | if (l4_proto == NEXTHDR_TCP) { |
395 | if (likely(transport_len >= sizeof(struct tcphdr))) |
396 | inet_proto_csum_replace16(sum: &tcp_hdr(skb)->check, skb, |
397 | from: addr, to: new_addr, pseudohdr: true); |
398 | } else if (l4_proto == NEXTHDR_UDP) { |
399 | if (likely(transport_len >= sizeof(struct udphdr))) { |
400 | struct udphdr *uh = udp_hdr(skb); |
401 | |
402 | if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) { |
403 | inet_proto_csum_replace16(sum: &uh->check, skb, |
404 | from: addr, to: new_addr, pseudohdr: true); |
405 | if (!uh->check) |
406 | uh->check = CSUM_MANGLED_0; |
407 | } |
408 | } |
409 | } else if (l4_proto == NEXTHDR_ICMP) { |
410 | if (likely(transport_len >= sizeof(struct icmp6hdr))) |
411 | inet_proto_csum_replace16(sum: &icmp6_hdr(skb)->icmp6_cksum, |
412 | skb, from: addr, to: new_addr, pseudohdr: true); |
413 | } |
414 | } |
415 | |
416 | static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4], |
417 | const __be32 mask[4], __be32 masked[4]) |
418 | { |
419 | masked[0] = OVS_MASKED(old[0], addr[0], mask[0]); |
420 | masked[1] = OVS_MASKED(old[1], addr[1], mask[1]); |
421 | masked[2] = OVS_MASKED(old[2], addr[2], mask[2]); |
422 | masked[3] = OVS_MASKED(old[3], addr[3], mask[3]); |
423 | } |
424 | |
425 | static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto, |
426 | __be32 addr[4], const __be32 new_addr[4], |
427 | bool recalculate_csum) |
428 | { |
429 | if (recalculate_csum) |
430 | update_ipv6_checksum(skb, l4_proto, addr, new_addr); |
431 | |
432 | skb_clear_hash(skb); |
433 | ovs_ct_clear(skb, NULL); |
434 | memcpy(addr, new_addr, sizeof(__be32[4])); |
435 | } |
436 | |
437 | static void set_ipv6_dsfield(struct sk_buff *skb, struct ipv6hdr *nh, u8 ipv6_tclass, u8 mask) |
438 | { |
439 | u8 old_ipv6_tclass = ipv6_get_dsfield(ipv6h: nh); |
440 | |
441 | ipv6_tclass = OVS_MASKED(old_ipv6_tclass, ipv6_tclass, mask); |
442 | |
443 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
444 | csum_replace(csum: &skb->csum, old: (__force __wsum)(old_ipv6_tclass << 12), |
445 | new: (__force __wsum)(ipv6_tclass << 12)); |
446 | |
447 | ipv6_change_dsfield(ipv6h: nh, mask: ~mask, value: ipv6_tclass); |
448 | } |
449 | |
450 | static void set_ipv6_fl(struct sk_buff *skb, struct ipv6hdr *nh, u32 fl, u32 mask) |
451 | { |
452 | u32 ofl; |
453 | |
454 | ofl = nh->flow_lbl[0] << 16 | nh->flow_lbl[1] << 8 | nh->flow_lbl[2]; |
455 | fl = OVS_MASKED(ofl, fl, mask); |
456 | |
457 | /* Bits 21-24 are always unmasked, so this retains their values. */ |
458 | nh->flow_lbl[0] = (u8)(fl >> 16); |
459 | nh->flow_lbl[1] = (u8)(fl >> 8); |
460 | nh->flow_lbl[2] = (u8)fl; |
461 | |
462 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
463 | csum_replace(csum: &skb->csum, old: (__force __wsum)htonl(ofl), new: (__force __wsum)htonl(fl)); |
464 | } |
465 | |
466 | static void set_ipv6_ttl(struct sk_buff *skb, struct ipv6hdr *nh, u8 new_ttl, u8 mask) |
467 | { |
468 | new_ttl = OVS_MASKED(nh->hop_limit, new_ttl, mask); |
469 | |
470 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
471 | csum_replace(csum: &skb->csum, old: (__force __wsum)(nh->hop_limit << 8), |
472 | new: (__force __wsum)(new_ttl << 8)); |
473 | nh->hop_limit = new_ttl; |
474 | } |
475 | |
476 | static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl, |
477 | u8 mask) |
478 | { |
479 | new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask); |
480 | |
481 | csum_replace2(sum: &nh->check, htons(nh->ttl << 8), htons(new_ttl << 8)); |
482 | nh->ttl = new_ttl; |
483 | } |
484 | |
485 | static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key, |
486 | const struct ovs_key_ipv4 *key, |
487 | const struct ovs_key_ipv4 *mask) |
488 | { |
489 | struct iphdr *nh; |
490 | __be32 new_addr; |
491 | int err; |
492 | |
493 | err = skb_ensure_writable(skb, write_len: skb_network_offset(skb) + |
494 | sizeof(struct iphdr)); |
495 | if (unlikely(err)) |
496 | return err; |
497 | |
498 | nh = ip_hdr(skb); |
499 | |
500 | /* Setting an IP addresses is typically only a side effect of |
501 | * matching on them in the current userspace implementation, so it |
502 | * makes sense to check if the value actually changed. |
503 | */ |
504 | if (mask->ipv4_src) { |
505 | new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src); |
506 | |
507 | if (unlikely(new_addr != nh->saddr)) { |
508 | set_ip_addr(skb, nh, addr: &nh->saddr, new_addr); |
509 | flow_key->ipv4.addr.src = new_addr; |
510 | } |
511 | } |
512 | if (mask->ipv4_dst) { |
513 | new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst); |
514 | |
515 | if (unlikely(new_addr != nh->daddr)) { |
516 | set_ip_addr(skb, nh, addr: &nh->daddr, new_addr); |
517 | flow_key->ipv4.addr.dst = new_addr; |
518 | } |
519 | } |
520 | if (mask->ipv4_tos) { |
521 | ipv4_change_dsfield(iph: nh, mask: ~mask->ipv4_tos, value: key->ipv4_tos); |
522 | flow_key->ip.tos = nh->tos; |
523 | } |
524 | if (mask->ipv4_ttl) { |
525 | set_ip_ttl(skb, nh, new_ttl: key->ipv4_ttl, mask: mask->ipv4_ttl); |
526 | flow_key->ip.ttl = nh->ttl; |
527 | } |
528 | |
529 | return 0; |
530 | } |
531 | |
532 | static bool is_ipv6_mask_nonzero(const __be32 addr[4]) |
533 | { |
534 | return !!(addr[0] | addr[1] | addr[2] | addr[3]); |
535 | } |
536 | |
537 | static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key, |
538 | const struct ovs_key_ipv6 *key, |
539 | const struct ovs_key_ipv6 *mask) |
540 | { |
541 | struct ipv6hdr *nh; |
542 | int err; |
543 | |
544 | err = skb_ensure_writable(skb, write_len: skb_network_offset(skb) + |
545 | sizeof(struct ipv6hdr)); |
546 | if (unlikely(err)) |
547 | return err; |
548 | |
549 | nh = ipv6_hdr(skb); |
550 | |
551 | /* Setting an IP addresses is typically only a side effect of |
552 | * matching on them in the current userspace implementation, so it |
553 | * makes sense to check if the value actually changed. |
554 | */ |
555 | if (is_ipv6_mask_nonzero(addr: mask->ipv6_src)) { |
556 | __be32 *saddr = (__be32 *)&nh->saddr; |
557 | __be32 masked[4]; |
558 | |
559 | mask_ipv6_addr(old: saddr, addr: key->ipv6_src, mask: mask->ipv6_src, masked); |
560 | |
561 | if (unlikely(memcmp(saddr, masked, sizeof(masked)))) { |
562 | set_ipv6_addr(skb, l4_proto: flow_key->ip.proto, addr: saddr, new_addr: masked, |
563 | recalculate_csum: true); |
564 | memcpy(&flow_key->ipv6.addr.src, masked, |
565 | sizeof(flow_key->ipv6.addr.src)); |
566 | } |
567 | } |
568 | if (is_ipv6_mask_nonzero(addr: mask->ipv6_dst)) { |
569 | unsigned int offset = 0; |
570 | int flags = IP6_FH_F_SKIP_RH; |
571 | bool recalc_csum = true; |
572 | __be32 *daddr = (__be32 *)&nh->daddr; |
573 | __be32 masked[4]; |
574 | |
575 | mask_ipv6_addr(old: daddr, addr: key->ipv6_dst, mask: mask->ipv6_dst, masked); |
576 | |
577 | if (unlikely(memcmp(daddr, masked, sizeof(masked)))) { |
578 | if (ipv6_ext_hdr(nexthdr: nh->nexthdr)) |
579 | recalc_csum = (ipv6_find_hdr(skb, offset: &offset, |
580 | NEXTHDR_ROUTING, |
581 | NULL, fragflg: &flags) |
582 | != NEXTHDR_ROUTING); |
583 | |
584 | set_ipv6_addr(skb, l4_proto: flow_key->ip.proto, addr: daddr, new_addr: masked, |
585 | recalculate_csum: recalc_csum); |
586 | memcpy(&flow_key->ipv6.addr.dst, masked, |
587 | sizeof(flow_key->ipv6.addr.dst)); |
588 | } |
589 | } |
590 | if (mask->ipv6_tclass) { |
591 | set_ipv6_dsfield(skb, nh, ipv6_tclass: key->ipv6_tclass, mask: mask->ipv6_tclass); |
592 | flow_key->ip.tos = ipv6_get_dsfield(ipv6h: nh); |
593 | } |
594 | if (mask->ipv6_label) { |
595 | set_ipv6_fl(skb, nh, ntohl(key->ipv6_label), |
596 | ntohl(mask->ipv6_label)); |
597 | flow_key->ipv6.label = |
598 | *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL); |
599 | } |
600 | if (mask->ipv6_hlimit) { |
601 | set_ipv6_ttl(skb, nh, new_ttl: key->ipv6_hlimit, mask: mask->ipv6_hlimit); |
602 | flow_key->ip.ttl = nh->hop_limit; |
603 | } |
604 | return 0; |
605 | } |
606 | |
607 | static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key, |
608 | const struct nlattr *a) |
609 | { |
610 | struct nshhdr *nh; |
611 | size_t length; |
612 | int err; |
613 | u8 flags; |
614 | u8 ttl; |
615 | int i; |
616 | |
617 | struct ovs_key_nsh key; |
618 | struct ovs_key_nsh mask; |
619 | |
620 | err = nsh_key_from_nlattr(attr: a, nsh: &key, nsh_mask: &mask); |
621 | if (err) |
622 | return err; |
623 | |
624 | /* Make sure the NSH base header is there */ |
625 | if (!pskb_may_pull(skb, len: skb_network_offset(skb) + NSH_BASE_HDR_LEN)) |
626 | return -ENOMEM; |
627 | |
628 | nh = nsh_hdr(skb); |
629 | length = nsh_hdr_len(nsh: nh); |
630 | |
631 | /* Make sure the whole NSH header is there */ |
632 | err = skb_ensure_writable(skb, write_len: skb_network_offset(skb) + |
633 | length); |
634 | if (unlikely(err)) |
635 | return err; |
636 | |
637 | nh = nsh_hdr(skb); |
638 | skb_postpull_rcsum(skb, start: nh, len: length); |
639 | flags = nsh_get_flags(nsh: nh); |
640 | flags = OVS_MASKED(flags, key.base.flags, mask.base.flags); |
641 | flow_key->nsh.base.flags = flags; |
642 | ttl = nsh_get_ttl(nsh: nh); |
643 | ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl); |
644 | flow_key->nsh.base.ttl = ttl; |
645 | nsh_set_flags_and_ttl(nsh: nh, flags, ttl); |
646 | nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr, |
647 | mask.base.path_hdr); |
648 | flow_key->nsh.base.path_hdr = nh->path_hdr; |
649 | switch (nh->mdtype) { |
650 | case NSH_M_TYPE1: |
651 | for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) { |
652 | nh->md1.context[i] = |
653 | OVS_MASKED(nh->md1.context[i], key.context[i], |
654 | mask.context[i]); |
655 | } |
656 | memcpy(flow_key->nsh.context, nh->md1.context, |
657 | sizeof(nh->md1.context)); |
658 | break; |
659 | case NSH_M_TYPE2: |
660 | memset(flow_key->nsh.context, 0, |
661 | sizeof(flow_key->nsh.context)); |
662 | break; |
663 | default: |
664 | return -EINVAL; |
665 | } |
666 | skb_postpush_rcsum(skb, start: nh, len: length); |
667 | return 0; |
668 | } |
669 | |
670 | /* Must follow skb_ensure_writable() since that can move the skb data. */ |
671 | static void set_tp_port(struct sk_buff *skb, __be16 *port, |
672 | __be16 new_port, __sum16 *check) |
673 | { |
674 | ovs_ct_clear(skb, NULL); |
675 | inet_proto_csum_replace2(sum: check, skb, from: *port, to: new_port, pseudohdr: false); |
676 | *port = new_port; |
677 | } |
678 | |
679 | static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
680 | const struct ovs_key_udp *key, |
681 | const struct ovs_key_udp *mask) |
682 | { |
683 | struct udphdr *uh; |
684 | __be16 src, dst; |
685 | int err; |
686 | |
687 | err = skb_ensure_writable(skb, write_len: skb_transport_offset(skb) + |
688 | sizeof(struct udphdr)); |
689 | if (unlikely(err)) |
690 | return err; |
691 | |
692 | uh = udp_hdr(skb); |
693 | /* Either of the masks is non-zero, so do not bother checking them. */ |
694 | src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src); |
695 | dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst); |
696 | |
697 | if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) { |
698 | if (likely(src != uh->source)) { |
699 | set_tp_port(skb, port: &uh->source, new_port: src, check: &uh->check); |
700 | flow_key->tp.src = src; |
701 | } |
702 | if (likely(dst != uh->dest)) { |
703 | set_tp_port(skb, port: &uh->dest, new_port: dst, check: &uh->check); |
704 | flow_key->tp.dst = dst; |
705 | } |
706 | |
707 | if (unlikely(!uh->check)) |
708 | uh->check = CSUM_MANGLED_0; |
709 | } else { |
710 | uh->source = src; |
711 | uh->dest = dst; |
712 | flow_key->tp.src = src; |
713 | flow_key->tp.dst = dst; |
714 | ovs_ct_clear(skb, NULL); |
715 | } |
716 | |
717 | skb_clear_hash(skb); |
718 | |
719 | return 0; |
720 | } |
721 | |
722 | static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
723 | const struct ovs_key_tcp *key, |
724 | const struct ovs_key_tcp *mask) |
725 | { |
726 | struct tcphdr *th; |
727 | __be16 src, dst; |
728 | int err; |
729 | |
730 | err = skb_ensure_writable(skb, write_len: skb_transport_offset(skb) + |
731 | sizeof(struct tcphdr)); |
732 | if (unlikely(err)) |
733 | return err; |
734 | |
735 | th = tcp_hdr(skb); |
736 | src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src); |
737 | if (likely(src != th->source)) { |
738 | set_tp_port(skb, port: &th->source, new_port: src, check: &th->check); |
739 | flow_key->tp.src = src; |
740 | } |
741 | dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst); |
742 | if (likely(dst != th->dest)) { |
743 | set_tp_port(skb, port: &th->dest, new_port: dst, check: &th->check); |
744 | flow_key->tp.dst = dst; |
745 | } |
746 | skb_clear_hash(skb); |
747 | |
748 | return 0; |
749 | } |
750 | |
751 | static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key, |
752 | const struct ovs_key_sctp *key, |
753 | const struct ovs_key_sctp *mask) |
754 | { |
755 | unsigned int sctphoff = skb_transport_offset(skb); |
756 | struct sctphdr *sh; |
757 | __le32 old_correct_csum, new_csum, old_csum; |
758 | int err; |
759 | |
760 | err = skb_ensure_writable(skb, write_len: sctphoff + sizeof(struct sctphdr)); |
761 | if (unlikely(err)) |
762 | return err; |
763 | |
764 | sh = sctp_hdr(skb); |
765 | old_csum = sh->checksum; |
766 | old_correct_csum = sctp_compute_cksum(skb, offset: sctphoff); |
767 | |
768 | sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src); |
769 | sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst); |
770 | |
771 | new_csum = sctp_compute_cksum(skb, offset: sctphoff); |
772 | |
773 | /* Carry any checksum errors through. */ |
774 | sh->checksum = old_csum ^ old_correct_csum ^ new_csum; |
775 | |
776 | skb_clear_hash(skb); |
777 | ovs_ct_clear(skb, NULL); |
778 | |
779 | flow_key->tp.src = sh->source; |
780 | flow_key->tp.dst = sh->dest; |
781 | |
782 | return 0; |
783 | } |
784 | |
785 | static int ovs_vport_output(struct net *net, struct sock *sk, |
786 | struct sk_buff *skb) |
787 | { |
788 | struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage); |
789 | struct vport *vport = data->vport; |
790 | |
791 | if (skb_cow_head(skb, headroom: data->l2_len) < 0) { |
792 | kfree_skb_reason(skb, reason: SKB_DROP_REASON_NOMEM); |
793 | return -ENOMEM; |
794 | } |
795 | |
796 | __skb_dst_copy(nskb: skb, refdst: data->dst); |
797 | *OVS_CB(skb) = data->cb; |
798 | skb->inner_protocol = data->inner_protocol; |
799 | if (data->vlan_tci & VLAN_CFI_MASK) |
800 | __vlan_hwaccel_put_tag(skb, vlan_proto: data->vlan_proto, vlan_tci: data->vlan_tci & ~VLAN_CFI_MASK); |
801 | else |
802 | __vlan_hwaccel_clear_tag(skb); |
803 | |
804 | /* Reconstruct the MAC header. */ |
805 | skb_push(skb, len: data->l2_len); |
806 | memcpy(skb->data, &data->l2_data, data->l2_len); |
807 | skb_postpush_rcsum(skb, start: skb->data, len: data->l2_len); |
808 | skb_reset_mac_header(skb); |
809 | |
810 | if (eth_p_mpls(eth_type: skb->protocol)) { |
811 | skb->inner_network_header = skb->network_header; |
812 | skb_set_network_header(skb, offset: data->network_offset); |
813 | skb_reset_mac_len(skb); |
814 | } |
815 | |
816 | ovs_vport_send(vport, skb, mac_proto: data->mac_proto); |
817 | return 0; |
818 | } |
819 | |
820 | static unsigned int |
821 | ovs_dst_get_mtu(const struct dst_entry *dst) |
822 | { |
823 | return dst->dev->mtu; |
824 | } |
825 | |
826 | static struct dst_ops ovs_dst_ops = { |
827 | .family = AF_UNSPEC, |
828 | .mtu = ovs_dst_get_mtu, |
829 | }; |
830 | |
831 | /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is |
832 | * ovs_vport_output(), which is called once per fragmented packet. |
833 | */ |
834 | static void prepare_frag(struct vport *vport, struct sk_buff *skb, |
835 | u16 orig_network_offset, u8 mac_proto) |
836 | { |
837 | unsigned int hlen = skb_network_offset(skb); |
838 | struct ovs_frag_data *data; |
839 | |
840 | data = this_cpu_ptr(&ovs_frag_data_storage); |
841 | data->dst = skb->_skb_refdst; |
842 | data->vport = vport; |
843 | data->cb = *OVS_CB(skb); |
844 | data->inner_protocol = skb->inner_protocol; |
845 | data->network_offset = orig_network_offset; |
846 | if (skb_vlan_tag_present(skb)) |
847 | data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK; |
848 | else |
849 | data->vlan_tci = 0; |
850 | data->vlan_proto = skb->vlan_proto; |
851 | data->mac_proto = mac_proto; |
852 | data->l2_len = hlen; |
853 | memcpy(&data->l2_data, skb->data, hlen); |
854 | |
855 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
856 | skb_pull(skb, len: hlen); |
857 | } |
858 | |
859 | static void ovs_fragment(struct net *net, struct vport *vport, |
860 | struct sk_buff *skb, u16 mru, |
861 | struct sw_flow_key *key) |
862 | { |
863 | enum ovs_drop_reason reason; |
864 | u16 orig_network_offset = 0; |
865 | |
866 | if (eth_p_mpls(eth_type: skb->protocol)) { |
867 | orig_network_offset = skb_network_offset(skb); |
868 | skb->network_header = skb->inner_network_header; |
869 | } |
870 | |
871 | if (skb_network_offset(skb) > MAX_L2_LEN) { |
872 | OVS_NLERR(1, "L2 header too long to fragment" ); |
873 | reason = OVS_DROP_FRAG_L2_TOO_LONG; |
874 | goto err; |
875 | } |
876 | |
877 | if (key->eth.type == htons(ETH_P_IP)) { |
878 | struct rtable ovs_rt = { 0 }; |
879 | unsigned long orig_dst; |
880 | |
881 | prepare_frag(vport, skb, orig_network_offset, |
882 | mac_proto: ovs_key_mac_proto(key)); |
883 | dst_init(dst: &ovs_rt.dst, ops: &ovs_dst_ops, NULL, |
884 | DST_OBSOLETE_NONE, DST_NOCOUNT); |
885 | ovs_rt.dst.dev = vport->dev; |
886 | |
887 | orig_dst = skb->_skb_refdst; |
888 | skb_dst_set_noref(skb, dst: &ovs_rt.dst); |
889 | IPCB(skb)->frag_max_size = mru; |
890 | |
891 | ip_do_fragment(net, sk: skb->sk, skb, output: ovs_vport_output); |
892 | refdst_drop(refdst: orig_dst); |
893 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
894 | unsigned long orig_dst; |
895 | struct rt6_info ovs_rt; |
896 | |
897 | prepare_frag(vport, skb, orig_network_offset, |
898 | mac_proto: ovs_key_mac_proto(key)); |
899 | memset(&ovs_rt, 0, sizeof(ovs_rt)); |
900 | dst_init(dst: &ovs_rt.dst, ops: &ovs_dst_ops, NULL, |
901 | DST_OBSOLETE_NONE, DST_NOCOUNT); |
902 | ovs_rt.dst.dev = vport->dev; |
903 | |
904 | orig_dst = skb->_skb_refdst; |
905 | skb_dst_set_noref(skb, dst: &ovs_rt.dst); |
906 | IP6CB(skb)->frag_max_size = mru; |
907 | |
908 | ipv6_stub->ipv6_fragment(net, skb->sk, skb, ovs_vport_output); |
909 | refdst_drop(refdst: orig_dst); |
910 | } else { |
911 | WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d." , |
912 | ovs_vport_name(vport), ntohs(key->eth.type), mru, |
913 | vport->dev->mtu); |
914 | reason = OVS_DROP_FRAG_INVALID_PROTO; |
915 | goto err; |
916 | } |
917 | |
918 | return; |
919 | err: |
920 | ovs_kfree_skb_reason(skb, reason); |
921 | } |
922 | |
923 | static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port, |
924 | struct sw_flow_key *key) |
925 | { |
926 | struct vport *vport = ovs_vport_rcu(dp, port_no: out_port); |
927 | |
928 | if (likely(vport && netif_carrier_ok(vport->dev))) { |
929 | u16 mru = OVS_CB(skb)->mru; |
930 | u32 cutlen = OVS_CB(skb)->cutlen; |
931 | |
932 | if (unlikely(cutlen > 0)) { |
933 | if (skb->len - cutlen > ovs_mac_header_len(key)) |
934 | pskb_trim(skb, len: skb->len - cutlen); |
935 | else |
936 | pskb_trim(skb, len: ovs_mac_header_len(key)); |
937 | } |
938 | |
939 | if (likely(!mru || |
940 | (skb->len <= mru + vport->dev->hard_header_len))) { |
941 | ovs_vport_send(vport, skb, mac_proto: ovs_key_mac_proto(key)); |
942 | } else if (mru <= vport->dev->mtu) { |
943 | struct net *net = read_pnet(pnet: &dp->net); |
944 | |
945 | ovs_fragment(net, vport, skb, mru, key); |
946 | } else { |
947 | kfree_skb_reason(skb, reason: SKB_DROP_REASON_PKT_TOO_BIG); |
948 | } |
949 | } else { |
950 | kfree_skb_reason(skb, reason: SKB_DROP_REASON_DEV_READY); |
951 | } |
952 | } |
953 | |
954 | static int output_userspace(struct datapath *dp, struct sk_buff *skb, |
955 | struct sw_flow_key *key, const struct nlattr *attr, |
956 | const struct nlattr *actions, int actions_len, |
957 | uint32_t cutlen) |
958 | { |
959 | struct dp_upcall_info upcall; |
960 | const struct nlattr *a; |
961 | int rem; |
962 | |
963 | memset(&upcall, 0, sizeof(upcall)); |
964 | upcall.cmd = OVS_PACKET_CMD_ACTION; |
965 | upcall.mru = OVS_CB(skb)->mru; |
966 | |
967 | for (a = nla_data(nla: attr), rem = nla_len(nla: attr); rem > 0; |
968 | a = nla_next(nla: a, remaining: &rem)) { |
969 | switch (nla_type(nla: a)) { |
970 | case OVS_USERSPACE_ATTR_USERDATA: |
971 | upcall.userdata = a; |
972 | break; |
973 | |
974 | case OVS_USERSPACE_ATTR_PID: |
975 | if (dp->user_features & |
976 | OVS_DP_F_DISPATCH_UPCALL_PER_CPU) |
977 | upcall.portid = |
978 | ovs_dp_get_upcall_portid(dp, |
979 | smp_processor_id()); |
980 | else |
981 | upcall.portid = nla_get_u32(nla: a); |
982 | break; |
983 | |
984 | case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: { |
985 | /* Get out tunnel info. */ |
986 | struct vport *vport; |
987 | |
988 | vport = ovs_vport_rcu(dp, port_no: nla_get_u32(nla: a)); |
989 | if (vport) { |
990 | int err; |
991 | |
992 | err = dev_fill_metadata_dst(dev: vport->dev, skb); |
993 | if (!err) |
994 | upcall.egress_tun_info = skb_tunnel_info(skb); |
995 | } |
996 | |
997 | break; |
998 | } |
999 | |
1000 | case OVS_USERSPACE_ATTR_ACTIONS: { |
1001 | /* Include actions. */ |
1002 | upcall.actions = actions; |
1003 | upcall.actions_len = actions_len; |
1004 | break; |
1005 | } |
1006 | |
1007 | } /* End of switch. */ |
1008 | } |
1009 | |
1010 | return ovs_dp_upcall(dp, skb, key, &upcall, cutlen); |
1011 | } |
1012 | |
1013 | static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb, |
1014 | struct sw_flow_key *key, |
1015 | const struct nlattr *attr) |
1016 | { |
1017 | /* The first attribute is always 'OVS_DEC_TTL_ATTR_ACTION'. */ |
1018 | struct nlattr *actions = nla_data(nla: attr); |
1019 | |
1020 | if (nla_len(nla: actions)) |
1021 | return clone_execute(dp, skb, key, recirc_id: 0, actions: nla_data(nla: actions), |
1022 | len: nla_len(nla: actions), last: true, clone_flow_key: false); |
1023 | |
1024 | ovs_kfree_skb_reason(skb, reason: OVS_DROP_IP_TTL); |
1025 | return 0; |
1026 | } |
1027 | |
1028 | /* When 'last' is true, sample() should always consume the 'skb'. |
1029 | * Otherwise, sample() should keep 'skb' intact regardless what |
1030 | * actions are executed within sample(). |
1031 | */ |
1032 | static int sample(struct datapath *dp, struct sk_buff *skb, |
1033 | struct sw_flow_key *key, const struct nlattr *attr, |
1034 | bool last) |
1035 | { |
1036 | struct nlattr *actions; |
1037 | struct nlattr *sample_arg; |
1038 | int rem = nla_len(nla: attr); |
1039 | const struct sample_arg *arg; |
1040 | bool clone_flow_key; |
1041 | |
1042 | /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */ |
1043 | sample_arg = nla_data(nla: attr); |
1044 | arg = nla_data(nla: sample_arg); |
1045 | actions = nla_next(nla: sample_arg, remaining: &rem); |
1046 | |
1047 | if ((arg->probability != U32_MAX) && |
1048 | (!arg->probability || get_random_u32() > arg->probability)) { |
1049 | if (last) |
1050 | ovs_kfree_skb_reason(skb, reason: OVS_DROP_LAST_ACTION); |
1051 | return 0; |
1052 | } |
1053 | |
1054 | clone_flow_key = !arg->exec; |
1055 | return clone_execute(dp, skb, key, recirc_id: 0, actions, len: rem, last, |
1056 | clone_flow_key); |
1057 | } |
1058 | |
1059 | /* When 'last' is true, clone() should always consume the 'skb'. |
1060 | * Otherwise, clone() should keep 'skb' intact regardless what |
1061 | * actions are executed within clone(). |
1062 | */ |
1063 | static int clone(struct datapath *dp, struct sk_buff *skb, |
1064 | struct sw_flow_key *key, const struct nlattr *attr, |
1065 | bool last) |
1066 | { |
1067 | struct nlattr *actions; |
1068 | struct nlattr *clone_arg; |
1069 | int rem = nla_len(nla: attr); |
1070 | bool dont_clone_flow_key; |
1071 | |
1072 | /* The first action is always 'OVS_CLONE_ATTR_EXEC'. */ |
1073 | clone_arg = nla_data(nla: attr); |
1074 | dont_clone_flow_key = nla_get_u32(nla: clone_arg); |
1075 | actions = nla_next(nla: clone_arg, remaining: &rem); |
1076 | |
1077 | return clone_execute(dp, skb, key, recirc_id: 0, actions, len: rem, last, |
1078 | clone_flow_key: !dont_clone_flow_key); |
1079 | } |
1080 | |
1081 | static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key, |
1082 | const struct nlattr *attr) |
1083 | { |
1084 | struct ovs_action_hash *hash_act = nla_data(nla: attr); |
1085 | u32 hash = 0; |
1086 | |
1087 | if (hash_act->hash_alg == OVS_HASH_ALG_L4) { |
1088 | /* OVS_HASH_ALG_L4 hasing type. */ |
1089 | hash = skb_get_hash(skb); |
1090 | } else if (hash_act->hash_alg == OVS_HASH_ALG_SYM_L4) { |
1091 | /* OVS_HASH_ALG_SYM_L4 hashing type. NOTE: this doesn't |
1092 | * extend past an encapsulated header. |
1093 | */ |
1094 | hash = __skb_get_hash_symmetric(skb); |
1095 | } |
1096 | |
1097 | hash = jhash_1word(a: hash, initval: hash_act->hash_basis); |
1098 | if (!hash) |
1099 | hash = 0x1; |
1100 | |
1101 | key->ovs_flow_hash = hash; |
1102 | } |
1103 | |
1104 | static int execute_set_action(struct sk_buff *skb, |
1105 | struct sw_flow_key *flow_key, |
1106 | const struct nlattr *a) |
1107 | { |
1108 | /* Only tunnel set execution is supported without a mask. */ |
1109 | if (nla_type(nla: a) == OVS_KEY_ATTR_TUNNEL_INFO) { |
1110 | struct ovs_tunnel_info *tun = nla_data(nla: a); |
1111 | |
1112 | skb_dst_drop(skb); |
1113 | dst_hold(dst: (struct dst_entry *)tun->tun_dst); |
1114 | skb_dst_set(skb, dst: (struct dst_entry *)tun->tun_dst); |
1115 | return 0; |
1116 | } |
1117 | |
1118 | return -EINVAL; |
1119 | } |
1120 | |
1121 | /* Mask is at the midpoint of the data. */ |
1122 | #define get_mask(a, type) ((const type)nla_data(a) + 1) |
1123 | |
1124 | static int execute_masked_set_action(struct sk_buff *skb, |
1125 | struct sw_flow_key *flow_key, |
1126 | const struct nlattr *a) |
1127 | { |
1128 | int err = 0; |
1129 | |
1130 | switch (nla_type(nla: a)) { |
1131 | case OVS_KEY_ATTR_PRIORITY: |
1132 | OVS_SET_MASKED(skb->priority, nla_get_u32(a), |
1133 | *get_mask(a, u32 *)); |
1134 | flow_key->phy.priority = skb->priority; |
1135 | break; |
1136 | |
1137 | case OVS_KEY_ATTR_SKB_MARK: |
1138 | OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *)); |
1139 | flow_key->phy.skb_mark = skb->mark; |
1140 | break; |
1141 | |
1142 | case OVS_KEY_ATTR_TUNNEL_INFO: |
1143 | /* Masked data not supported for tunnel. */ |
1144 | err = -EINVAL; |
1145 | break; |
1146 | |
1147 | case OVS_KEY_ATTR_ETHERNET: |
1148 | err = set_eth_addr(skb, flow_key, key: nla_data(nla: a), |
1149 | get_mask(a, struct ovs_key_ethernet *)); |
1150 | break; |
1151 | |
1152 | case OVS_KEY_ATTR_NSH: |
1153 | err = set_nsh(skb, flow_key, a); |
1154 | break; |
1155 | |
1156 | case OVS_KEY_ATTR_IPV4: |
1157 | err = set_ipv4(skb, flow_key, key: nla_data(nla: a), |
1158 | get_mask(a, struct ovs_key_ipv4 *)); |
1159 | break; |
1160 | |
1161 | case OVS_KEY_ATTR_IPV6: |
1162 | err = set_ipv6(skb, flow_key, key: nla_data(nla: a), |
1163 | get_mask(a, struct ovs_key_ipv6 *)); |
1164 | break; |
1165 | |
1166 | case OVS_KEY_ATTR_TCP: |
1167 | err = set_tcp(skb, flow_key, key: nla_data(nla: a), |
1168 | get_mask(a, struct ovs_key_tcp *)); |
1169 | break; |
1170 | |
1171 | case OVS_KEY_ATTR_UDP: |
1172 | err = set_udp(skb, flow_key, key: nla_data(nla: a), |
1173 | get_mask(a, struct ovs_key_udp *)); |
1174 | break; |
1175 | |
1176 | case OVS_KEY_ATTR_SCTP: |
1177 | err = set_sctp(skb, flow_key, key: nla_data(nla: a), |
1178 | get_mask(a, struct ovs_key_sctp *)); |
1179 | break; |
1180 | |
1181 | case OVS_KEY_ATTR_MPLS: |
1182 | err = set_mpls(skb, flow_key, mpls_lse: nla_data(nla: a), get_mask(a, |
1183 | __be32 *)); |
1184 | break; |
1185 | |
1186 | case OVS_KEY_ATTR_CT_STATE: |
1187 | case OVS_KEY_ATTR_CT_ZONE: |
1188 | case OVS_KEY_ATTR_CT_MARK: |
1189 | case OVS_KEY_ATTR_CT_LABELS: |
1190 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4: |
1191 | case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6: |
1192 | err = -EINVAL; |
1193 | break; |
1194 | } |
1195 | |
1196 | return err; |
1197 | } |
1198 | |
1199 | static int execute_recirc(struct datapath *dp, struct sk_buff *skb, |
1200 | struct sw_flow_key *key, |
1201 | const struct nlattr *a, bool last) |
1202 | { |
1203 | u32 recirc_id; |
1204 | |
1205 | if (!is_flow_key_valid(key)) { |
1206 | int err; |
1207 | |
1208 | err = ovs_flow_key_update(skb, key); |
1209 | if (err) |
1210 | return err; |
1211 | } |
1212 | BUG_ON(!is_flow_key_valid(key)); |
1213 | |
1214 | recirc_id = nla_get_u32(nla: a); |
1215 | return clone_execute(dp, skb, key, recirc_id, NULL, len: 0, last, clone_flow_key: true); |
1216 | } |
1217 | |
1218 | static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb, |
1219 | struct sw_flow_key *key, |
1220 | const struct nlattr *attr, bool last) |
1221 | { |
1222 | struct ovs_skb_cb *ovs_cb = OVS_CB(skb); |
1223 | const struct nlattr *actions, *cpl_arg; |
1224 | int len, max_len, rem = nla_len(nla: attr); |
1225 | const struct check_pkt_len_arg *arg; |
1226 | bool clone_flow_key; |
1227 | |
1228 | /* The first netlink attribute in 'attr' is always |
1229 | * 'OVS_CHECK_PKT_LEN_ATTR_ARG'. |
1230 | */ |
1231 | cpl_arg = nla_data(nla: attr); |
1232 | arg = nla_data(nla: cpl_arg); |
1233 | |
1234 | len = ovs_cb->mru ? ovs_cb->mru + skb->mac_len : skb->len; |
1235 | max_len = arg->pkt_len; |
1236 | |
1237 | if ((skb_is_gso(skb) && skb_gso_validate_mac_len(skb, len: max_len)) || |
1238 | len <= max_len) { |
1239 | /* Second netlink attribute in 'attr' is always |
1240 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'. |
1241 | */ |
1242 | actions = nla_next(nla: cpl_arg, remaining: &rem); |
1243 | clone_flow_key = !arg->exec_for_lesser_equal; |
1244 | } else { |
1245 | /* Third netlink attribute in 'attr' is always |
1246 | * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'. |
1247 | */ |
1248 | actions = nla_next(nla: cpl_arg, remaining: &rem); |
1249 | actions = nla_next(nla: actions, remaining: &rem); |
1250 | clone_flow_key = !arg->exec_for_greater; |
1251 | } |
1252 | |
1253 | return clone_execute(dp, skb, key, recirc_id: 0, actions: nla_data(nla: actions), |
1254 | len: nla_len(nla: actions), last, clone_flow_key); |
1255 | } |
1256 | |
1257 | static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key) |
1258 | { |
1259 | int err; |
1260 | |
1261 | if (skb->protocol == htons(ETH_P_IPV6)) { |
1262 | struct ipv6hdr *nh; |
1263 | |
1264 | err = skb_ensure_writable(skb, write_len: skb_network_offset(skb) + |
1265 | sizeof(*nh)); |
1266 | if (unlikely(err)) |
1267 | return err; |
1268 | |
1269 | nh = ipv6_hdr(skb); |
1270 | |
1271 | if (nh->hop_limit <= 1) |
1272 | return -EHOSTUNREACH; |
1273 | |
1274 | key->ip.ttl = --nh->hop_limit; |
1275 | } else if (skb->protocol == htons(ETH_P_IP)) { |
1276 | struct iphdr *nh; |
1277 | u8 old_ttl; |
1278 | |
1279 | err = skb_ensure_writable(skb, write_len: skb_network_offset(skb) + |
1280 | sizeof(*nh)); |
1281 | if (unlikely(err)) |
1282 | return err; |
1283 | |
1284 | nh = ip_hdr(skb); |
1285 | if (nh->ttl <= 1) |
1286 | return -EHOSTUNREACH; |
1287 | |
1288 | old_ttl = nh->ttl--; |
1289 | csum_replace2(sum: &nh->check, htons(old_ttl << 8), |
1290 | htons(nh->ttl << 8)); |
1291 | key->ip.ttl = nh->ttl; |
1292 | } |
1293 | return 0; |
1294 | } |
1295 | |
1296 | /* Execute a list of actions against 'skb'. */ |
1297 | static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, |
1298 | struct sw_flow_key *key, |
1299 | const struct nlattr *attr, int len) |
1300 | { |
1301 | const struct nlattr *a; |
1302 | int rem; |
1303 | |
1304 | for (a = attr, rem = len; rem > 0; |
1305 | a = nla_next(nla: a, remaining: &rem)) { |
1306 | int err = 0; |
1307 | |
1308 | if (trace_ovs_do_execute_action_enabled()) |
1309 | trace_ovs_do_execute_action(dp, skb, key, a, rem); |
1310 | |
1311 | /* Actions that rightfully have to consume the skb should do it |
1312 | * and return directly. |
1313 | */ |
1314 | switch (nla_type(nla: a)) { |
1315 | case OVS_ACTION_ATTR_OUTPUT: { |
1316 | int port = nla_get_u32(nla: a); |
1317 | struct sk_buff *clone; |
1318 | |
1319 | /* Every output action needs a separate clone |
1320 | * of 'skb', In case the output action is the |
1321 | * last action, cloning can be avoided. |
1322 | */ |
1323 | if (nla_is_last(nla: a, rem)) { |
1324 | do_output(dp, skb, out_port: port, key); |
1325 | /* 'skb' has been used for output. |
1326 | */ |
1327 | return 0; |
1328 | } |
1329 | |
1330 | clone = skb_clone(skb, GFP_ATOMIC); |
1331 | if (clone) |
1332 | do_output(dp, skb: clone, out_port: port, key); |
1333 | OVS_CB(skb)->cutlen = 0; |
1334 | break; |
1335 | } |
1336 | |
1337 | case OVS_ACTION_ATTR_TRUNC: { |
1338 | struct ovs_action_trunc *trunc = nla_data(nla: a); |
1339 | |
1340 | if (skb->len > trunc->max_len) |
1341 | OVS_CB(skb)->cutlen = skb->len - trunc->max_len; |
1342 | break; |
1343 | } |
1344 | |
1345 | case OVS_ACTION_ATTR_USERSPACE: |
1346 | output_userspace(dp, skb, key, attr: a, actions: attr, |
1347 | actions_len: len, OVS_CB(skb)->cutlen); |
1348 | OVS_CB(skb)->cutlen = 0; |
1349 | if (nla_is_last(nla: a, rem)) { |
1350 | consume_skb(skb); |
1351 | return 0; |
1352 | } |
1353 | break; |
1354 | |
1355 | case OVS_ACTION_ATTR_HASH: |
1356 | execute_hash(skb, key, attr: a); |
1357 | break; |
1358 | |
1359 | case OVS_ACTION_ATTR_PUSH_MPLS: { |
1360 | struct ovs_action_push_mpls *mpls = nla_data(nla: a); |
1361 | |
1362 | err = push_mpls(skb, key, mpls_lse: mpls->mpls_lse, |
1363 | mpls_ethertype: mpls->mpls_ethertype, mac_len: skb->mac_len); |
1364 | break; |
1365 | } |
1366 | case OVS_ACTION_ATTR_ADD_MPLS: { |
1367 | struct ovs_action_add_mpls *mpls = nla_data(nla: a); |
1368 | __u16 mac_len = 0; |
1369 | |
1370 | if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) |
1371 | mac_len = skb->mac_len; |
1372 | |
1373 | err = push_mpls(skb, key, mpls_lse: mpls->mpls_lse, |
1374 | mpls_ethertype: mpls->mpls_ethertype, mac_len); |
1375 | break; |
1376 | } |
1377 | case OVS_ACTION_ATTR_POP_MPLS: |
1378 | err = pop_mpls(skb, key, ethertype: nla_get_be16(nla: a)); |
1379 | break; |
1380 | |
1381 | case OVS_ACTION_ATTR_PUSH_VLAN: |
1382 | err = push_vlan(skb, key, vlan: nla_data(nla: a)); |
1383 | break; |
1384 | |
1385 | case OVS_ACTION_ATTR_POP_VLAN: |
1386 | err = pop_vlan(skb, key); |
1387 | break; |
1388 | |
1389 | case OVS_ACTION_ATTR_RECIRC: { |
1390 | bool last = nla_is_last(nla: a, rem); |
1391 | |
1392 | err = execute_recirc(dp, skb, key, a, last); |
1393 | if (last) { |
1394 | /* If this is the last action, the skb has |
1395 | * been consumed or freed. |
1396 | * Return immediately. |
1397 | */ |
1398 | return err; |
1399 | } |
1400 | break; |
1401 | } |
1402 | |
1403 | case OVS_ACTION_ATTR_SET: |
1404 | err = execute_set_action(skb, flow_key: key, a: nla_data(nla: a)); |
1405 | break; |
1406 | |
1407 | case OVS_ACTION_ATTR_SET_MASKED: |
1408 | case OVS_ACTION_ATTR_SET_TO_MASKED: |
1409 | err = execute_masked_set_action(skb, flow_key: key, a: nla_data(nla: a)); |
1410 | break; |
1411 | |
1412 | case OVS_ACTION_ATTR_SAMPLE: { |
1413 | bool last = nla_is_last(nla: a, rem); |
1414 | |
1415 | err = sample(dp, skb, key, attr: a, last); |
1416 | if (last) |
1417 | return err; |
1418 | |
1419 | break; |
1420 | } |
1421 | |
1422 | case OVS_ACTION_ATTR_CT: |
1423 | if (!is_flow_key_valid(key)) { |
1424 | err = ovs_flow_key_update(skb, key); |
1425 | if (err) |
1426 | return err; |
1427 | } |
1428 | |
1429 | err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key, |
1430 | nla_data(nla: a)); |
1431 | |
1432 | /* Hide stolen IP fragments from user space. */ |
1433 | if (err) |
1434 | return err == -EINPROGRESS ? 0 : err; |
1435 | break; |
1436 | |
1437 | case OVS_ACTION_ATTR_CT_CLEAR: |
1438 | err = ovs_ct_clear(skb, key); |
1439 | break; |
1440 | |
1441 | case OVS_ACTION_ATTR_PUSH_ETH: |
1442 | err = push_eth(skb, key, ethh: nla_data(nla: a)); |
1443 | break; |
1444 | |
1445 | case OVS_ACTION_ATTR_POP_ETH: |
1446 | err = pop_eth(skb, key); |
1447 | break; |
1448 | |
1449 | case OVS_ACTION_ATTR_PUSH_NSH: |
1450 | err = push_nsh(skb, key, a: nla_data(nla: a)); |
1451 | break; |
1452 | |
1453 | case OVS_ACTION_ATTR_POP_NSH: |
1454 | err = pop_nsh(skb, key); |
1455 | break; |
1456 | |
1457 | case OVS_ACTION_ATTR_METER: |
1458 | if (ovs_meter_execute(dp, skb, key, meter_id: nla_get_u32(nla: a))) { |
1459 | ovs_kfree_skb_reason(skb, reason: OVS_DROP_METER); |
1460 | return 0; |
1461 | } |
1462 | break; |
1463 | |
1464 | case OVS_ACTION_ATTR_CLONE: { |
1465 | bool last = nla_is_last(nla: a, rem); |
1466 | |
1467 | err = clone(dp, skb, key, attr: a, last); |
1468 | if (last) |
1469 | return err; |
1470 | |
1471 | break; |
1472 | } |
1473 | |
1474 | case OVS_ACTION_ATTR_CHECK_PKT_LEN: { |
1475 | bool last = nla_is_last(nla: a, rem); |
1476 | |
1477 | err = execute_check_pkt_len(dp, skb, key, attr: a, last); |
1478 | if (last) |
1479 | return err; |
1480 | |
1481 | break; |
1482 | } |
1483 | |
1484 | case OVS_ACTION_ATTR_DEC_TTL: |
1485 | err = execute_dec_ttl(skb, key); |
1486 | if (err == -EHOSTUNREACH) |
1487 | return dec_ttl_exception_handler(dp, skb, |
1488 | key, attr: a); |
1489 | break; |
1490 | |
1491 | case OVS_ACTION_ATTR_DROP: { |
1492 | enum ovs_drop_reason reason = nla_get_u32(nla: a) |
1493 | ? OVS_DROP_EXPLICIT_WITH_ERROR |
1494 | : OVS_DROP_EXPLICIT; |
1495 | |
1496 | ovs_kfree_skb_reason(skb, reason); |
1497 | return 0; |
1498 | } |
1499 | } |
1500 | |
1501 | if (unlikely(err)) { |
1502 | ovs_kfree_skb_reason(skb, reason: OVS_DROP_ACTION_ERROR); |
1503 | return err; |
1504 | } |
1505 | } |
1506 | |
1507 | ovs_kfree_skb_reason(skb, reason: OVS_DROP_LAST_ACTION); |
1508 | return 0; |
1509 | } |
1510 | |
1511 | /* Execute the actions on the clone of the packet. The effect of the |
1512 | * execution does not affect the original 'skb' nor the original 'key'. |
1513 | * |
1514 | * The execution may be deferred in case the actions can not be executed |
1515 | * immediately. |
1516 | */ |
1517 | static int clone_execute(struct datapath *dp, struct sk_buff *skb, |
1518 | struct sw_flow_key *key, u32 recirc_id, |
1519 | const struct nlattr *actions, int len, |
1520 | bool last, bool clone_flow_key) |
1521 | { |
1522 | struct deferred_action *da; |
1523 | struct sw_flow_key *clone; |
1524 | |
1525 | skb = last ? skb : skb_clone(skb, GFP_ATOMIC); |
1526 | if (!skb) { |
1527 | /* Out of memory, skip this action. |
1528 | */ |
1529 | return 0; |
1530 | } |
1531 | |
1532 | /* When clone_flow_key is false, the 'key' will not be change |
1533 | * by the actions, then the 'key' can be used directly. |
1534 | * Otherwise, try to clone key from the next recursion level of |
1535 | * 'flow_keys'. If clone is successful, execute the actions |
1536 | * without deferring. |
1537 | */ |
1538 | clone = clone_flow_key ? clone_key(key_: key) : key; |
1539 | if (clone) { |
1540 | int err = 0; |
1541 | |
1542 | if (actions) { /* Sample action */ |
1543 | if (clone_flow_key) |
1544 | __this_cpu_inc(exec_actions_level); |
1545 | |
1546 | err = do_execute_actions(dp, skb, key: clone, |
1547 | attr: actions, len); |
1548 | |
1549 | if (clone_flow_key) |
1550 | __this_cpu_dec(exec_actions_level); |
1551 | } else { /* Recirc action */ |
1552 | clone->recirc_id = recirc_id; |
1553 | ovs_dp_process_packet(skb, key: clone); |
1554 | } |
1555 | return err; |
1556 | } |
1557 | |
1558 | /* Out of 'flow_keys' space. Defer actions */ |
1559 | da = add_deferred_actions(skb, key, actions, actions_len: len); |
1560 | if (da) { |
1561 | if (!actions) { /* Recirc action */ |
1562 | key = &da->pkt_key; |
1563 | key->recirc_id = recirc_id; |
1564 | } |
1565 | } else { |
1566 | /* Out of per CPU action FIFO space. Drop the 'skb' and |
1567 | * log an error. |
1568 | */ |
1569 | ovs_kfree_skb_reason(skb, reason: OVS_DROP_DEFERRED_LIMIT); |
1570 | |
1571 | if (net_ratelimit()) { |
1572 | if (actions) { /* Sample action */ |
1573 | pr_warn("%s: deferred action limit reached, drop sample action\n" , |
1574 | ovs_dp_name(dp)); |
1575 | } else { /* Recirc action */ |
1576 | pr_warn("%s: deferred action limit reached, drop recirc action (recirc_id=%#x)\n" , |
1577 | ovs_dp_name(dp), recirc_id); |
1578 | } |
1579 | } |
1580 | } |
1581 | return 0; |
1582 | } |
1583 | |
1584 | static void process_deferred_actions(struct datapath *dp) |
1585 | { |
1586 | struct action_fifo *fifo = this_cpu_ptr(action_fifos); |
1587 | |
1588 | /* Do not touch the FIFO in case there is no deferred actions. */ |
1589 | if (action_fifo_is_empty(fifo)) |
1590 | return; |
1591 | |
1592 | /* Finishing executing all deferred actions. */ |
1593 | do { |
1594 | struct deferred_action *da = action_fifo_get(fifo); |
1595 | struct sk_buff *skb = da->skb; |
1596 | struct sw_flow_key *key = &da->pkt_key; |
1597 | const struct nlattr *actions = da->actions; |
1598 | int actions_len = da->actions_len; |
1599 | |
1600 | if (actions) |
1601 | do_execute_actions(dp, skb, key, attr: actions, len: actions_len); |
1602 | else |
1603 | ovs_dp_process_packet(skb, key); |
1604 | } while (!action_fifo_is_empty(fifo)); |
1605 | |
1606 | /* Reset FIFO for the next packet. */ |
1607 | action_fifo_init(fifo); |
1608 | } |
1609 | |
1610 | /* Execute a list of actions against 'skb'. */ |
1611 | int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, |
1612 | const struct sw_flow_actions *acts, |
1613 | struct sw_flow_key *key) |
1614 | { |
1615 | int err, level; |
1616 | |
1617 | level = __this_cpu_inc_return(exec_actions_level); |
1618 | if (unlikely(level > OVS_RECURSION_LIMIT)) { |
1619 | net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n" , |
1620 | ovs_dp_name(dp)); |
1621 | ovs_kfree_skb_reason(skb, reason: OVS_DROP_RECURSION_LIMIT); |
1622 | err = -ENETDOWN; |
1623 | goto out; |
1624 | } |
1625 | |
1626 | OVS_CB(skb)->acts_origlen = acts->orig_len; |
1627 | err = do_execute_actions(dp, skb, key, |
1628 | attr: acts->actions, len: acts->actions_len); |
1629 | |
1630 | if (level == 1) |
1631 | process_deferred_actions(dp); |
1632 | |
1633 | out: |
1634 | __this_cpu_dec(exec_actions_level); |
1635 | return err; |
1636 | } |
1637 | |
1638 | int action_fifos_init(void) |
1639 | { |
1640 | action_fifos = alloc_percpu(struct action_fifo); |
1641 | if (!action_fifos) |
1642 | return -ENOMEM; |
1643 | |
1644 | flow_keys = alloc_percpu(struct action_flow_keys); |
1645 | if (!flow_keys) { |
1646 | free_percpu(pdata: action_fifos); |
1647 | return -ENOMEM; |
1648 | } |
1649 | |
1650 | return 0; |
1651 | } |
1652 | |
1653 | void action_fifos_exit(void) |
1654 | { |
1655 | free_percpu(pdata: action_fifos); |
1656 | free_percpu(pdata: flow_keys); |
1657 | } |
1658 | |