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7f8a436e JS |
1 | /* |
2 | * Copyright (c) 2015 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/openvswitch.h> | |
16 | #include <net/ip.h> | |
17 | #include <net/netfilter/nf_conntrack_core.h> | |
c2ac6673 | 18 | #include <net/netfilter/nf_conntrack_labels.h> |
7f8a436e JS |
19 | #include <net/netfilter/nf_conntrack_zones.h> |
20 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> | |
21 | ||
22 | #include "datapath.h" | |
23 | #include "conntrack.h" | |
24 | #include "flow.h" | |
25 | #include "flow_netlink.h" | |
26 | ||
27 | struct ovs_ct_len_tbl { | |
28 | size_t maxlen; | |
29 | size_t minlen; | |
30 | }; | |
31 | ||
182e3042 JS |
32 | /* Metadata mark for masked write to conntrack mark */ |
33 | struct md_mark { | |
34 | u32 value; | |
35 | u32 mask; | |
36 | }; | |
37 | ||
c2ac6673 JS |
38 | /* Metadata label for masked write to conntrack label. */ |
39 | struct md_label { | |
40 | struct ovs_key_ct_label value; | |
41 | struct ovs_key_ct_label mask; | |
42 | }; | |
43 | ||
7f8a436e JS |
44 | /* Conntrack action context for execution. */ |
45 | struct ovs_conntrack_info { | |
46 | struct nf_conntrack_zone zone; | |
47 | struct nf_conn *ct; | |
48 | u32 flags; | |
49 | u16 family; | |
182e3042 | 50 | struct md_mark mark; |
c2ac6673 | 51 | struct md_label label; |
7f8a436e JS |
52 | }; |
53 | ||
54 | static u16 key_to_nfproto(const struct sw_flow_key *key) | |
55 | { | |
56 | switch (ntohs(key->eth.type)) { | |
57 | case ETH_P_IP: | |
58 | return NFPROTO_IPV4; | |
59 | case ETH_P_IPV6: | |
60 | return NFPROTO_IPV6; | |
61 | default: | |
62 | return NFPROTO_UNSPEC; | |
63 | } | |
64 | } | |
65 | ||
66 | /* Map SKB connection state into the values used by flow definition. */ | |
67 | static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) | |
68 | { | |
69 | u8 ct_state = OVS_CS_F_TRACKED; | |
70 | ||
71 | switch (ctinfo) { | |
72 | case IP_CT_ESTABLISHED_REPLY: | |
73 | case IP_CT_RELATED_REPLY: | |
74 | case IP_CT_NEW_REPLY: | |
75 | ct_state |= OVS_CS_F_REPLY_DIR; | |
76 | break; | |
77 | default: | |
78 | break; | |
79 | } | |
80 | ||
81 | switch (ctinfo) { | |
82 | case IP_CT_ESTABLISHED: | |
83 | case IP_CT_ESTABLISHED_REPLY: | |
84 | ct_state |= OVS_CS_F_ESTABLISHED; | |
85 | break; | |
86 | case IP_CT_RELATED: | |
87 | case IP_CT_RELATED_REPLY: | |
88 | ct_state |= OVS_CS_F_RELATED; | |
89 | break; | |
90 | case IP_CT_NEW: | |
91 | case IP_CT_NEW_REPLY: | |
92 | ct_state |= OVS_CS_F_NEW; | |
93 | break; | |
94 | default: | |
95 | break; | |
96 | } | |
97 | ||
98 | return ct_state; | |
99 | } | |
100 | ||
c2ac6673 JS |
101 | static void ovs_ct_get_label(const struct nf_conn *ct, |
102 | struct ovs_key_ct_label *label) | |
103 | { | |
104 | struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; | |
105 | ||
106 | if (cl) { | |
107 | size_t len = cl->words * sizeof(long); | |
108 | ||
109 | if (len > OVS_CT_LABEL_LEN) | |
110 | len = OVS_CT_LABEL_LEN; | |
111 | else if (len < OVS_CT_LABEL_LEN) | |
112 | memset(label, 0, OVS_CT_LABEL_LEN); | |
113 | memcpy(label, cl->bits, len); | |
114 | } else { | |
115 | memset(label, 0, OVS_CT_LABEL_LEN); | |
116 | } | |
117 | } | |
118 | ||
7f8a436e | 119 | static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, |
182e3042 JS |
120 | const struct nf_conntrack_zone *zone, |
121 | const struct nf_conn *ct) | |
7f8a436e JS |
122 | { |
123 | key->ct.state = state; | |
124 | key->ct.zone = zone->id; | |
182e3042 | 125 | key->ct.mark = ct ? ct->mark : 0; |
c2ac6673 | 126 | ovs_ct_get_label(ct, &key->ct.label); |
7f8a436e JS |
127 | } |
128 | ||
129 | /* Update 'key' based on skb->nfct. If 'post_ct' is true, then OVS has | |
130 | * previously sent the packet to conntrack via the ct action. | |
131 | */ | |
132 | static void ovs_ct_update_key(const struct sk_buff *skb, | |
133 | struct sw_flow_key *key, bool post_ct) | |
134 | { | |
135 | const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; | |
136 | enum ip_conntrack_info ctinfo; | |
137 | struct nf_conn *ct; | |
138 | u8 state = 0; | |
139 | ||
140 | ct = nf_ct_get(skb, &ctinfo); | |
141 | if (ct) { | |
142 | state = ovs_ct_get_state(ctinfo); | |
143 | if (ct->master) | |
144 | state |= OVS_CS_F_RELATED; | |
145 | zone = nf_ct_zone(ct); | |
146 | } else if (post_ct) { | |
147 | state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; | |
148 | } | |
182e3042 | 149 | __ovs_ct_update_key(key, state, zone, ct); |
7f8a436e JS |
150 | } |
151 | ||
152 | void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) | |
153 | { | |
154 | ovs_ct_update_key(skb, key, false); | |
155 | } | |
156 | ||
157 | int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb) | |
158 | { | |
159 | if (nla_put_u8(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state)) | |
160 | return -EMSGSIZE; | |
161 | ||
162 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
163 | nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone)) | |
164 | return -EMSGSIZE; | |
165 | ||
182e3042 JS |
166 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
167 | nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark)) | |
168 | return -EMSGSIZE; | |
169 | ||
c2ac6673 JS |
170 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABEL) && |
171 | nla_put(skb, OVS_KEY_ATTR_CT_LABEL, sizeof(key->ct.label), | |
172 | &key->ct.label)) | |
173 | return -EMSGSIZE; | |
174 | ||
182e3042 JS |
175 | return 0; |
176 | } | |
177 | ||
178 | static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key, | |
179 | u32 ct_mark, u32 mask) | |
180 | { | |
181 | enum ip_conntrack_info ctinfo; | |
182 | struct nf_conn *ct; | |
183 | u32 new_mark; | |
184 | ||
185 | if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) | |
186 | return -ENOTSUPP; | |
187 | ||
188 | /* The connection could be invalid, in which case set_mark is no-op. */ | |
189 | ct = nf_ct_get(skb, &ctinfo); | |
190 | if (!ct) | |
191 | return 0; | |
192 | ||
193 | new_mark = ct_mark | (ct->mark & ~(mask)); | |
194 | if (ct->mark != new_mark) { | |
195 | ct->mark = new_mark; | |
196 | nf_conntrack_event_cache(IPCT_MARK, ct); | |
197 | key->ct.mark = new_mark; | |
198 | } | |
199 | ||
7f8a436e JS |
200 | return 0; |
201 | } | |
202 | ||
c2ac6673 JS |
203 | static int ovs_ct_set_label(struct sk_buff *skb, struct sw_flow_key *key, |
204 | const struct ovs_key_ct_label *label, | |
205 | const struct ovs_key_ct_label *mask) | |
206 | { | |
207 | enum ip_conntrack_info ctinfo; | |
208 | struct nf_conn_labels *cl; | |
209 | struct nf_conn *ct; | |
210 | int err; | |
211 | ||
212 | if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) | |
213 | return -ENOTSUPP; | |
214 | ||
215 | /* The connection could be invalid, in which case set_label is no-op.*/ | |
216 | ct = nf_ct_get(skb, &ctinfo); | |
217 | if (!ct) | |
218 | return 0; | |
219 | ||
220 | cl = nf_ct_labels_find(ct); | |
221 | if (!cl) { | |
222 | nf_ct_labels_ext_add(ct); | |
223 | cl = nf_ct_labels_find(ct); | |
224 | } | |
225 | if (!cl || cl->words * sizeof(long) < OVS_CT_LABEL_LEN) | |
226 | return -ENOSPC; | |
227 | ||
228 | err = nf_connlabels_replace(ct, (u32 *)label, (u32 *)mask, | |
229 | OVS_CT_LABEL_LEN / sizeof(u32)); | |
230 | if (err) | |
231 | return err; | |
232 | ||
233 | ovs_ct_get_label(ct, &key->ct.label); | |
234 | return 0; | |
235 | } | |
236 | ||
7f8a436e JS |
237 | static int handle_fragments(struct net *net, struct sw_flow_key *key, |
238 | u16 zone, struct sk_buff *skb) | |
239 | { | |
240 | struct ovs_skb_cb ovs_cb = *OVS_CB(skb); | |
241 | ||
242 | if (key->eth.type == htons(ETH_P_IP)) { | |
243 | enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; | |
244 | int err; | |
245 | ||
246 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
247 | err = ip_defrag(skb, user); | |
248 | if (err) | |
249 | return err; | |
250 | ||
251 | ovs_cb.mru = IPCB(skb)->frag_max_size; | |
252 | } else if (key->eth.type == htons(ETH_P_IPV6)) { | |
253 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) | |
254 | enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; | |
255 | struct sk_buff *reasm; | |
256 | ||
257 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); | |
258 | reasm = nf_ct_frag6_gather(skb, user); | |
259 | if (!reasm) | |
260 | return -EINPROGRESS; | |
261 | ||
262 | if (skb == reasm) | |
263 | return -EINVAL; | |
264 | ||
265 | key->ip.proto = ipv6_hdr(reasm)->nexthdr; | |
266 | skb_morph(skb, reasm); | |
267 | consume_skb(reasm); | |
268 | ovs_cb.mru = IP6CB(skb)->frag_max_size; | |
269 | #else | |
270 | return -EPFNOSUPPORT; | |
271 | #endif | |
272 | } else { | |
273 | return -EPFNOSUPPORT; | |
274 | } | |
275 | ||
276 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
277 | skb_clear_hash(skb); | |
278 | skb->ignore_df = 1; | |
279 | *OVS_CB(skb) = ovs_cb; | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | static struct nf_conntrack_expect * | |
285 | ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, | |
286 | u16 proto, const struct sk_buff *skb) | |
287 | { | |
288 | struct nf_conntrack_tuple tuple; | |
289 | ||
290 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, &tuple)) | |
291 | return NULL; | |
292 | return __nf_ct_expect_find(net, zone, &tuple); | |
293 | } | |
294 | ||
295 | /* Determine whether skb->nfct is equal to the result of conntrack lookup. */ | |
296 | static bool skb_nfct_cached(const struct net *net, const struct sk_buff *skb, | |
297 | const struct ovs_conntrack_info *info) | |
298 | { | |
299 | enum ip_conntrack_info ctinfo; | |
300 | struct nf_conn *ct; | |
301 | ||
302 | ct = nf_ct_get(skb, &ctinfo); | |
303 | if (!ct) | |
304 | return false; | |
305 | if (!net_eq(net, read_pnet(&ct->ct_net))) | |
306 | return false; | |
307 | if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) | |
308 | return false; | |
309 | ||
310 | return true; | |
311 | } | |
312 | ||
313 | static int __ovs_ct_lookup(struct net *net, const struct sw_flow_key *key, | |
314 | const struct ovs_conntrack_info *info, | |
315 | struct sk_buff *skb) | |
316 | { | |
317 | /* If we are recirculating packets to match on conntrack fields and | |
318 | * committing with a separate conntrack action, then we don't need to | |
319 | * actually run the packet through conntrack twice unless it's for a | |
320 | * different zone. | |
321 | */ | |
322 | if (!skb_nfct_cached(net, skb, info)) { | |
323 | struct nf_conn *tmpl = info->ct; | |
324 | ||
325 | /* Associate skb with specified zone. */ | |
326 | if (tmpl) { | |
327 | if (skb->nfct) | |
328 | nf_conntrack_put(skb->nfct); | |
329 | nf_conntrack_get(&tmpl->ct_general); | |
330 | skb->nfct = &tmpl->ct_general; | |
331 | skb->nfctinfo = IP_CT_NEW; | |
332 | } | |
333 | ||
334 | if (nf_conntrack_in(net, info->family, NF_INET_PRE_ROUTING, | |
335 | skb) != NF_ACCEPT) | |
336 | return -ENOENT; | |
337 | } | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | /* Lookup connection and read fields into key. */ | |
343 | static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, | |
344 | const struct ovs_conntrack_info *info, | |
345 | struct sk_buff *skb) | |
346 | { | |
347 | struct nf_conntrack_expect *exp; | |
348 | ||
349 | exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); | |
350 | if (exp) { | |
351 | u8 state; | |
352 | ||
353 | state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; | |
182e3042 | 354 | __ovs_ct_update_key(key, state, &info->zone, exp->master); |
7f8a436e JS |
355 | } else { |
356 | int err; | |
357 | ||
358 | err = __ovs_ct_lookup(net, key, info, skb); | |
359 | if (err) | |
360 | return err; | |
361 | ||
362 | ovs_ct_update_key(skb, key, true); | |
363 | } | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | /* Lookup connection and confirm if unconfirmed. */ | |
369 | static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, | |
370 | const struct ovs_conntrack_info *info, | |
371 | struct sk_buff *skb) | |
372 | { | |
373 | u8 state; | |
374 | int err; | |
375 | ||
376 | state = key->ct.state; | |
377 | if (key->ct.zone == info->zone.id && | |
378 | ((state & OVS_CS_F_TRACKED) && !(state & OVS_CS_F_NEW))) { | |
379 | /* Previous lookup has shown that this connection is already | |
380 | * tracked and committed. Skip committing. | |
381 | */ | |
382 | return 0; | |
383 | } | |
384 | ||
385 | err = __ovs_ct_lookup(net, key, info, skb); | |
386 | if (err) | |
387 | return err; | |
388 | if (nf_conntrack_confirm(skb) != NF_ACCEPT) | |
389 | return -EINVAL; | |
390 | ||
391 | ovs_ct_update_key(skb, key, true); | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
c2ac6673 JS |
396 | static bool label_nonzero(const struct ovs_key_ct_label *label) |
397 | { | |
398 | size_t i; | |
399 | ||
400 | for (i = 0; i < sizeof(*label); i++) | |
401 | if (label->ct_label[i]) | |
402 | return true; | |
403 | ||
404 | return false; | |
405 | } | |
406 | ||
7f8a436e JS |
407 | int ovs_ct_execute(struct net *net, struct sk_buff *skb, |
408 | struct sw_flow_key *key, | |
409 | const struct ovs_conntrack_info *info) | |
410 | { | |
411 | int nh_ofs; | |
412 | int err; | |
413 | ||
414 | /* The conntrack module expects to be working at L3. */ | |
415 | nh_ofs = skb_network_offset(skb); | |
416 | skb_pull(skb, nh_ofs); | |
417 | ||
418 | if (key->ip.frag != OVS_FRAG_TYPE_NONE) { | |
419 | err = handle_fragments(net, key, info->zone.id, skb); | |
420 | if (err) | |
421 | return err; | |
422 | } | |
423 | ||
424 | if (info->flags & OVS_CT_F_COMMIT) | |
425 | err = ovs_ct_commit(net, key, info, skb); | |
426 | else | |
427 | err = ovs_ct_lookup(net, key, info, skb); | |
182e3042 JS |
428 | if (err) |
429 | goto err; | |
7f8a436e | 430 | |
c2ac6673 | 431 | if (info->mark.mask) { |
182e3042 JS |
432 | err = ovs_ct_set_mark(skb, key, info->mark.value, |
433 | info->mark.mask); | |
c2ac6673 JS |
434 | if (err) |
435 | goto err; | |
436 | } | |
437 | if (label_nonzero(&info->label.mask)) | |
438 | err = ovs_ct_set_label(skb, key, &info->label.value, | |
439 | &info->label.mask); | |
182e3042 | 440 | err: |
7f8a436e JS |
441 | skb_push(skb, nh_ofs); |
442 | return err; | |
443 | } | |
444 | ||
445 | static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { | |
446 | [OVS_CT_ATTR_FLAGS] = { .minlen = sizeof(u32), | |
447 | .maxlen = sizeof(u32) }, | |
448 | [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), | |
449 | .maxlen = sizeof(u16) }, | |
182e3042 JS |
450 | [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), |
451 | .maxlen = sizeof(struct md_mark) }, | |
c2ac6673 JS |
452 | [OVS_CT_ATTR_LABEL] = { .minlen = sizeof(struct md_label), |
453 | .maxlen = sizeof(struct md_label) }, | |
7f8a436e JS |
454 | }; |
455 | ||
456 | static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, | |
457 | bool log) | |
458 | { | |
459 | struct nlattr *a; | |
460 | int rem; | |
461 | ||
462 | nla_for_each_nested(a, attr, rem) { | |
463 | int type = nla_type(a); | |
464 | int maxlen = ovs_ct_attr_lens[type].maxlen; | |
465 | int minlen = ovs_ct_attr_lens[type].minlen; | |
466 | ||
467 | if (type > OVS_CT_ATTR_MAX) { | |
468 | OVS_NLERR(log, | |
469 | "Unknown conntrack attr (type=%d, max=%d)", | |
470 | type, OVS_CT_ATTR_MAX); | |
471 | return -EINVAL; | |
472 | } | |
473 | if (nla_len(a) < minlen || nla_len(a) > maxlen) { | |
474 | OVS_NLERR(log, | |
475 | "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", | |
476 | type, nla_len(a), maxlen); | |
477 | return -EINVAL; | |
478 | } | |
479 | ||
480 | switch (type) { | |
481 | case OVS_CT_ATTR_FLAGS: | |
482 | info->flags = nla_get_u32(a); | |
483 | break; | |
484 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
485 | case OVS_CT_ATTR_ZONE: | |
486 | info->zone.id = nla_get_u16(a); | |
487 | break; | |
182e3042 JS |
488 | #endif |
489 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
490 | case OVS_CT_ATTR_MARK: { | |
491 | struct md_mark *mark = nla_data(a); | |
492 | ||
493 | info->mark = *mark; | |
494 | break; | |
495 | } | |
c2ac6673 JS |
496 | #endif |
497 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
498 | case OVS_CT_ATTR_LABEL: { | |
499 | struct md_label *label = nla_data(a); | |
500 | ||
501 | info->label = *label; | |
502 | break; | |
503 | } | |
7f8a436e JS |
504 | #endif |
505 | default: | |
506 | OVS_NLERR(log, "Unknown conntrack attr (%d)", | |
507 | type); | |
508 | return -EINVAL; | |
509 | } | |
510 | } | |
511 | ||
512 | if (rem > 0) { | |
513 | OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); | |
514 | return -EINVAL; | |
515 | } | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
c2ac6673 | 520 | bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) |
7f8a436e JS |
521 | { |
522 | if (attr == OVS_KEY_ATTR_CT_STATE) | |
523 | return true; | |
524 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
525 | attr == OVS_KEY_ATTR_CT_ZONE) | |
526 | return true; | |
182e3042 JS |
527 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
528 | attr == OVS_KEY_ATTR_CT_MARK) | |
529 | return true; | |
c2ac6673 JS |
530 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
531 | attr == OVS_KEY_ATTR_CT_LABEL) { | |
532 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
533 | ||
534 | return ovs_net->xt_label; | |
535 | } | |
7f8a436e JS |
536 | |
537 | return false; | |
538 | } | |
539 | ||
540 | int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, | |
541 | const struct sw_flow_key *key, | |
542 | struct sw_flow_actions **sfa, bool log) | |
543 | { | |
544 | struct ovs_conntrack_info ct_info; | |
545 | u16 family; | |
546 | int err; | |
547 | ||
548 | family = key_to_nfproto(key); | |
549 | if (family == NFPROTO_UNSPEC) { | |
550 | OVS_NLERR(log, "ct family unspecified"); | |
551 | return -EINVAL; | |
552 | } | |
553 | ||
554 | memset(&ct_info, 0, sizeof(ct_info)); | |
555 | ct_info.family = family; | |
556 | ||
557 | nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, | |
558 | NF_CT_DEFAULT_ZONE_DIR, 0); | |
559 | ||
560 | err = parse_ct(attr, &ct_info, log); | |
561 | if (err) | |
562 | return err; | |
563 | ||
564 | /* Set up template for tracking connections in specific zones. */ | |
565 | ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); | |
566 | if (!ct_info.ct) { | |
567 | OVS_NLERR(log, "Failed to allocate conntrack template"); | |
568 | return -ENOMEM; | |
569 | } | |
570 | ||
571 | err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, | |
572 | sizeof(ct_info), log); | |
573 | if (err) | |
574 | goto err_free_ct; | |
575 | ||
576 | __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); | |
577 | nf_conntrack_get(&ct_info.ct->ct_general); | |
578 | return 0; | |
579 | err_free_ct: | |
580 | nf_conntrack_free(ct_info.ct); | |
581 | return err; | |
582 | } | |
583 | ||
584 | int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, | |
585 | struct sk_buff *skb) | |
586 | { | |
587 | struct nlattr *start; | |
588 | ||
589 | start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); | |
590 | if (!start) | |
591 | return -EMSGSIZE; | |
592 | ||
593 | if (nla_put_u32(skb, OVS_CT_ATTR_FLAGS, ct_info->flags)) | |
594 | return -EMSGSIZE; | |
595 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
596 | nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) | |
597 | return -EMSGSIZE; | |
182e3042 JS |
598 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
599 | nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), | |
600 | &ct_info->mark)) | |
601 | return -EMSGSIZE; | |
c2ac6673 JS |
602 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
603 | nla_put(skb, OVS_CT_ATTR_LABEL, sizeof(ct_info->label), | |
604 | &ct_info->label)) | |
605 | return -EMSGSIZE; | |
7f8a436e JS |
606 | |
607 | nla_nest_end(skb, start); | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | void ovs_ct_free_action(const struct nlattr *a) | |
613 | { | |
614 | struct ovs_conntrack_info *ct_info = nla_data(a); | |
615 | ||
616 | if (ct_info->ct) | |
617 | nf_ct_put(ct_info->ct); | |
618 | } | |
c2ac6673 JS |
619 | |
620 | void ovs_ct_init(struct net *net) | |
621 | { | |
622 | unsigned int n_bits = sizeof(struct ovs_key_ct_label) * BITS_PER_BYTE; | |
623 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
624 | ||
625 | if (nf_connlabels_get(net, n_bits)) { | |
626 | ovs_net->xt_label = false; | |
627 | OVS_NLERR(true, "Failed to set connlabel length"); | |
628 | } else { | |
629 | ovs_net->xt_label = true; | |
630 | } | |
631 | } | |
632 | ||
633 | void ovs_ct_exit(struct net *net) | |
634 | { | |
635 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
636 | ||
637 | if (ovs_net->xt_label) | |
638 | nf_connlabels_put(net); | |
639 | } |