blob: ee6ff8ffc12d924655f111307233d7a8bb88e638 [file] [log] [blame]
Joe Stringer7f8a4362015-08-26 11:31:48 -07001/*
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>
Joe Stringercae3a262015-08-26 11:31:53 -070018#include <net/netfilter/nf_conntrack_helper.h>
Joe Stringerc2ac6672015-08-26 11:31:52 -070019#include <net/netfilter/nf_conntrack_labels.h>
Joe Stringer7f8a4362015-08-26 11:31:48 -070020#include <net/netfilter/nf_conntrack_zones.h>
21#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
22
23#include "datapath.h"
24#include "conntrack.h"
25#include "flow.h"
26#include "flow_netlink.h"
27
28struct ovs_ct_len_tbl {
29 size_t maxlen;
30 size_t minlen;
31};
32
Joe Stringer182e3042015-08-26 11:31:49 -070033/* Metadata mark for masked write to conntrack mark */
34struct md_mark {
35 u32 value;
36 u32 mask;
37};
38
Joe Stringerc2ac6672015-08-26 11:31:52 -070039/* Metadata label for masked write to conntrack label. */
Joe Stringer33db4122015-10-01 15:00:37 -070040struct md_labels {
41 struct ovs_key_ct_labels value;
42 struct ovs_key_ct_labels mask;
Joe Stringerc2ac6672015-08-26 11:31:52 -070043};
44
Joe Stringer7f8a4362015-08-26 11:31:48 -070045/* Conntrack action context for execution. */
46struct ovs_conntrack_info {
Joe Stringercae3a262015-08-26 11:31:53 -070047 struct nf_conntrack_helper *helper;
Joe Stringer7f8a4362015-08-26 11:31:48 -070048 struct nf_conntrack_zone zone;
49 struct nf_conn *ct;
Joe Stringerab38a7b2015-10-06 11:00:01 -070050 u8 commit : 1;
Joe Stringer7f8a4362015-08-26 11:31:48 -070051 u16 family;
Joe Stringer182e3042015-08-26 11:31:49 -070052 struct md_mark mark;
Joe Stringer33db4122015-10-01 15:00:37 -070053 struct md_labels labels;
Joe Stringer7f8a4362015-08-26 11:31:48 -070054};
55
Joe Stringer2f3ab9f2015-12-09 14:07:39 -080056static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
57
Joe Stringer7f8a4362015-08-26 11:31:48 -070058static u16 key_to_nfproto(const struct sw_flow_key *key)
59{
60 switch (ntohs(key->eth.type)) {
61 case ETH_P_IP:
62 return NFPROTO_IPV4;
63 case ETH_P_IPV6:
64 return NFPROTO_IPV6;
65 default:
66 return NFPROTO_UNSPEC;
67 }
68}
69
70/* Map SKB connection state into the values used by flow definition. */
71static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
72{
73 u8 ct_state = OVS_CS_F_TRACKED;
74
75 switch (ctinfo) {
76 case IP_CT_ESTABLISHED_REPLY:
77 case IP_CT_RELATED_REPLY:
78 case IP_CT_NEW_REPLY:
79 ct_state |= OVS_CS_F_REPLY_DIR;
80 break;
81 default:
82 break;
83 }
84
85 switch (ctinfo) {
86 case IP_CT_ESTABLISHED:
87 case IP_CT_ESTABLISHED_REPLY:
88 ct_state |= OVS_CS_F_ESTABLISHED;
89 break;
90 case IP_CT_RELATED:
91 case IP_CT_RELATED_REPLY:
92 ct_state |= OVS_CS_F_RELATED;
93 break;
94 case IP_CT_NEW:
95 case IP_CT_NEW_REPLY:
96 ct_state |= OVS_CS_F_NEW;
97 break;
98 default:
99 break;
100 }
101
102 return ct_state;
103}
104
Joe Stringer0d5cdef2015-08-28 19:22:11 -0700105static u32 ovs_ct_get_mark(const struct nf_conn *ct)
106{
107#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
108 return ct ? ct->mark : 0;
109#else
110 return 0;
111#endif
112}
113
Joe Stringer33db4122015-10-01 15:00:37 -0700114static void ovs_ct_get_labels(const struct nf_conn *ct,
115 struct ovs_key_ct_labels *labels)
Joe Stringerc2ac6672015-08-26 11:31:52 -0700116{
117 struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
118
119 if (cl) {
120 size_t len = cl->words * sizeof(long);
121
Joe Stringer33db4122015-10-01 15:00:37 -0700122 if (len > OVS_CT_LABELS_LEN)
123 len = OVS_CT_LABELS_LEN;
124 else if (len < OVS_CT_LABELS_LEN)
125 memset(labels, 0, OVS_CT_LABELS_LEN);
126 memcpy(labels, cl->bits, len);
Joe Stringerc2ac6672015-08-26 11:31:52 -0700127 } else {
Joe Stringer33db4122015-10-01 15:00:37 -0700128 memset(labels, 0, OVS_CT_LABELS_LEN);
Joe Stringerc2ac6672015-08-26 11:31:52 -0700129 }
130}
131
Joe Stringer7f8a4362015-08-26 11:31:48 -0700132static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
Joe Stringer182e3042015-08-26 11:31:49 -0700133 const struct nf_conntrack_zone *zone,
134 const struct nf_conn *ct)
Joe Stringer7f8a4362015-08-26 11:31:48 -0700135{
136 key->ct.state = state;
137 key->ct.zone = zone->id;
Joe Stringer0d5cdef2015-08-28 19:22:11 -0700138 key->ct.mark = ovs_ct_get_mark(ct);
Joe Stringer33db4122015-10-01 15:00:37 -0700139 ovs_ct_get_labels(ct, &key->ct.labels);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700140}
141
142/* Update 'key' based on skb->nfct. If 'post_ct' is true, then OVS has
143 * previously sent the packet to conntrack via the ct action.
144 */
145static void ovs_ct_update_key(const struct sk_buff *skb,
Joe Stringerd1109862015-12-09 14:07:40 -0800146 const struct ovs_conntrack_info *info,
Joe Stringer7f8a4362015-08-26 11:31:48 -0700147 struct sw_flow_key *key, bool post_ct)
148{
149 const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
150 enum ip_conntrack_info ctinfo;
151 struct nf_conn *ct;
152 u8 state = 0;
153
154 ct = nf_ct_get(skb, &ctinfo);
155 if (ct) {
156 state = ovs_ct_get_state(ctinfo);
Joe Stringer4f0909e2015-10-19 19:18:59 -0700157 if (!nf_ct_is_confirmed(ct))
158 state |= OVS_CS_F_NEW;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700159 if (ct->master)
160 state |= OVS_CS_F_RELATED;
161 zone = nf_ct_zone(ct);
162 } else if (post_ct) {
163 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
Joe Stringerd1109862015-12-09 14:07:40 -0800164 if (info)
165 zone = &info->zone;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700166 }
Joe Stringer182e3042015-08-26 11:31:49 -0700167 __ovs_ct_update_key(key, state, zone, ct);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700168}
169
170void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
171{
Joe Stringerd1109862015-12-09 14:07:40 -0800172 ovs_ct_update_key(skb, NULL, key, false);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700173}
174
175int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb)
176{
Joe Stringerfbccce52015-10-06 11:00:00 -0700177 if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state))
Joe Stringer7f8a4362015-08-26 11:31:48 -0700178 return -EMSGSIZE;
179
180 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
181 nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone))
182 return -EMSGSIZE;
183
Joe Stringer182e3042015-08-26 11:31:49 -0700184 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
185 nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark))
186 return -EMSGSIZE;
187
Valentin Rothberg9723e6a2015-08-28 10:39:56 +0200188 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
Joe Stringer33db4122015-10-01 15:00:37 -0700189 nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(key->ct.labels),
190 &key->ct.labels))
Joe Stringerc2ac6672015-08-26 11:31:52 -0700191 return -EMSGSIZE;
192
Joe Stringer182e3042015-08-26 11:31:49 -0700193 return 0;
194}
195
196static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
197 u32 ct_mark, u32 mask)
198{
Joe Stringer0d5cdef2015-08-28 19:22:11 -0700199#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
Joe Stringer182e3042015-08-26 11:31:49 -0700200 enum ip_conntrack_info ctinfo;
201 struct nf_conn *ct;
202 u32 new_mark;
203
Joe Stringer182e3042015-08-26 11:31:49 -0700204
205 /* The connection could be invalid, in which case set_mark is no-op. */
206 ct = nf_ct_get(skb, &ctinfo);
207 if (!ct)
208 return 0;
209
210 new_mark = ct_mark | (ct->mark & ~(mask));
211 if (ct->mark != new_mark) {
212 ct->mark = new_mark;
213 nf_conntrack_event_cache(IPCT_MARK, ct);
214 key->ct.mark = new_mark;
215 }
216
Joe Stringer7f8a4362015-08-26 11:31:48 -0700217 return 0;
Joe Stringer0d5cdef2015-08-28 19:22:11 -0700218#else
219 return -ENOTSUPP;
220#endif
Joe Stringer7f8a4362015-08-26 11:31:48 -0700221}
222
Joe Stringer33db4122015-10-01 15:00:37 -0700223static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key,
224 const struct ovs_key_ct_labels *labels,
225 const struct ovs_key_ct_labels *mask)
Joe Stringerc2ac6672015-08-26 11:31:52 -0700226{
227 enum ip_conntrack_info ctinfo;
228 struct nf_conn_labels *cl;
229 struct nf_conn *ct;
230 int err;
231
Joe Stringerc2ac6672015-08-26 11:31:52 -0700232 /* The connection could be invalid, in which case set_label is no-op.*/
233 ct = nf_ct_get(skb, &ctinfo);
234 if (!ct)
235 return 0;
236
237 cl = nf_ct_labels_find(ct);
238 if (!cl) {
239 nf_ct_labels_ext_add(ct);
240 cl = nf_ct_labels_find(ct);
241 }
Joe Stringer33db4122015-10-01 15:00:37 -0700242 if (!cl || cl->words * sizeof(long) < OVS_CT_LABELS_LEN)
Joe Stringerc2ac6672015-08-26 11:31:52 -0700243 return -ENOSPC;
244
Joe Stringer33db4122015-10-01 15:00:37 -0700245 err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask,
246 OVS_CT_LABELS_LEN / sizeof(u32));
Joe Stringerc2ac6672015-08-26 11:31:52 -0700247 if (err)
248 return err;
249
Joe Stringer33db4122015-10-01 15:00:37 -0700250 ovs_ct_get_labels(ct, &key->ct.labels);
Joe Stringerc2ac6672015-08-26 11:31:52 -0700251 return 0;
252}
253
Joe Stringercae3a262015-08-26 11:31:53 -0700254/* 'skb' should already be pulled to nh_ofs. */
255static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
256{
257 const struct nf_conntrack_helper *helper;
258 const struct nf_conn_help *help;
259 enum ip_conntrack_info ctinfo;
260 unsigned int protoff;
261 struct nf_conn *ct;
262
263 ct = nf_ct_get(skb, &ctinfo);
264 if (!ct || ctinfo == IP_CT_RELATED_REPLY)
265 return NF_ACCEPT;
266
267 help = nfct_help(ct);
268 if (!help)
269 return NF_ACCEPT;
270
271 helper = rcu_dereference(help->helper);
272 if (!helper)
273 return NF_ACCEPT;
274
275 switch (proto) {
276 case NFPROTO_IPV4:
277 protoff = ip_hdrlen(skb);
278 break;
279 case NFPROTO_IPV6: {
280 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
281 __be16 frag_off;
Joe Stringercc570602015-09-14 11:14:50 -0700282 int ofs;
Joe Stringercae3a262015-08-26 11:31:53 -0700283
Joe Stringercc570602015-09-14 11:14:50 -0700284 ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
285 &frag_off);
286 if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
Joe Stringercae3a262015-08-26 11:31:53 -0700287 pr_debug("proto header not found\n");
288 return NF_ACCEPT;
289 }
Joe Stringercc570602015-09-14 11:14:50 -0700290 protoff = ofs;
Joe Stringercae3a262015-08-26 11:31:53 -0700291 break;
292 }
293 default:
294 WARN_ONCE(1, "helper invoked on non-IP family!");
295 return NF_DROP;
296 }
297
298 return helper->help(skb, protoff, ct, ctinfo);
299}
300
Joe Stringer74c16612015-10-25 20:21:48 -0700301/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
302 * value if 'skb' is freed.
303 */
Joe Stringer7f8a4362015-08-26 11:31:48 -0700304static int handle_fragments(struct net *net, struct sw_flow_key *key,
305 u16 zone, struct sk_buff *skb)
306{
307 struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
Florian Westphaldaaa7d62015-11-18 23:32:40 +0100308 int err;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700309
310 if (key->eth.type == htons(ETH_P_IP)) {
311 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700312
313 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
Eric W. Biederman19bcf9f2015-10-09 13:44:54 -0500314 err = ip_defrag(net, skb, user);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700315 if (err)
316 return err;
317
318 ovs_cb.mru = IPCB(skb)->frag_max_size;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700319#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
Joe Stringer74c16612015-10-25 20:21:48 -0700320 } else if (key->eth.type == htons(ETH_P_IPV6)) {
Joe Stringer7f8a4362015-08-26 11:31:48 -0700321 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700322
323 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
Florian Westphaldaaa7d62015-11-18 23:32:40 +0100324 err = nf_ct_frag6_gather(net, skb, user);
325 if (err)
326 return err;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700327
Florian Westphaldaaa7d62015-11-18 23:32:40 +0100328 key->ip.proto = ipv6_hdr(skb)->nexthdr;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700329 ovs_cb.mru = IP6CB(skb)->frag_max_size;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700330#endif
331 } else {
Joe Stringer74c16612015-10-25 20:21:48 -0700332 kfree_skb(skb);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700333 return -EPFNOSUPPORT;
334 }
335
336 key->ip.frag = OVS_FRAG_TYPE_NONE;
337 skb_clear_hash(skb);
338 skb->ignore_df = 1;
339 *OVS_CB(skb) = ovs_cb;
340
341 return 0;
342}
343
344static struct nf_conntrack_expect *
345ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
346 u16 proto, const struct sk_buff *skb)
347{
348 struct nf_conntrack_tuple tuple;
349
Eric W. Biedermana31f1ad2015-09-18 14:33:04 -0500350 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple))
Joe Stringer7f8a4362015-08-26 11:31:48 -0700351 return NULL;
352 return __nf_ct_expect_find(net, zone, &tuple);
353}
354
355/* Determine whether skb->nfct is equal to the result of conntrack lookup. */
356static bool skb_nfct_cached(const struct net *net, const struct sk_buff *skb,
357 const struct ovs_conntrack_info *info)
358{
359 enum ip_conntrack_info ctinfo;
360 struct nf_conn *ct;
361
362 ct = nf_ct_get(skb, &ctinfo);
363 if (!ct)
364 return false;
365 if (!net_eq(net, read_pnet(&ct->ct_net)))
366 return false;
367 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
368 return false;
Joe Stringercae3a262015-08-26 11:31:53 -0700369 if (info->helper) {
370 struct nf_conn_help *help;
371
372 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
373 if (help && rcu_access_pointer(help->helper) != info->helper)
374 return false;
375 }
Joe Stringer7f8a4362015-08-26 11:31:48 -0700376
377 return true;
378}
379
Joe Stringer4f0909e2015-10-19 19:18:59 -0700380static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
Joe Stringer7f8a4362015-08-26 11:31:48 -0700381 const struct ovs_conntrack_info *info,
382 struct sk_buff *skb)
383{
384 /* If we are recirculating packets to match on conntrack fields and
385 * committing with a separate conntrack action, then we don't need to
386 * actually run the packet through conntrack twice unless it's for a
387 * different zone.
388 */
389 if (!skb_nfct_cached(net, skb, info)) {
390 struct nf_conn *tmpl = info->ct;
391
392 /* Associate skb with specified zone. */
393 if (tmpl) {
394 if (skb->nfct)
395 nf_conntrack_put(skb->nfct);
396 nf_conntrack_get(&tmpl->ct_general);
397 skb->nfct = &tmpl->ct_general;
398 skb->nfctinfo = IP_CT_NEW;
399 }
400
401 if (nf_conntrack_in(net, info->family, NF_INET_PRE_ROUTING,
402 skb) != NF_ACCEPT)
403 return -ENOENT;
Joe Stringercae3a262015-08-26 11:31:53 -0700404
405 if (ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
406 WARN_ONCE(1, "helper rejected packet");
407 return -EINVAL;
408 }
Joe Stringer7f8a4362015-08-26 11:31:48 -0700409 }
410
Joe Stringerd1109862015-12-09 14:07:40 -0800411 ovs_ct_update_key(skb, info, key, true);
Joe Stringer4f0909e2015-10-19 19:18:59 -0700412
Joe Stringer7f8a4362015-08-26 11:31:48 -0700413 return 0;
414}
415
416/* Lookup connection and read fields into key. */
417static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
418 const struct ovs_conntrack_info *info,
419 struct sk_buff *skb)
420{
421 struct nf_conntrack_expect *exp;
422
423 exp = ovs_ct_expect_find(net, &info->zone, info->family, skb);
424 if (exp) {
425 u8 state;
426
427 state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
Joe Stringer182e3042015-08-26 11:31:49 -0700428 __ovs_ct_update_key(key, state, &info->zone, exp->master);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700429 } else {
430 int err;
431
432 err = __ovs_ct_lookup(net, key, info, skb);
433 if (err)
434 return err;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700435 }
436
437 return 0;
438}
439
440/* Lookup connection and confirm if unconfirmed. */
441static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
442 const struct ovs_conntrack_info *info,
443 struct sk_buff *skb)
444{
445 u8 state;
446 int err;
447
448 state = key->ct.state;
449 if (key->ct.zone == info->zone.id &&
450 ((state & OVS_CS_F_TRACKED) && !(state & OVS_CS_F_NEW))) {
451 /* Previous lookup has shown that this connection is already
452 * tracked and committed. Skip committing.
453 */
454 return 0;
455 }
456
457 err = __ovs_ct_lookup(net, key, info, skb);
458 if (err)
459 return err;
460 if (nf_conntrack_confirm(skb) != NF_ACCEPT)
461 return -EINVAL;
462
Joe Stringer7f8a4362015-08-26 11:31:48 -0700463 return 0;
464}
465
Joe Stringer33db4122015-10-01 15:00:37 -0700466static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
Joe Stringerc2ac6672015-08-26 11:31:52 -0700467{
468 size_t i;
469
Joe Stringer33db4122015-10-01 15:00:37 -0700470 for (i = 0; i < sizeof(*labels); i++)
471 if (labels->ct_labels[i])
Joe Stringerc2ac6672015-08-26 11:31:52 -0700472 return true;
473
474 return false;
475}
476
Joe Stringer74c16612015-10-25 20:21:48 -0700477/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
478 * value if 'skb' is freed.
479 */
Joe Stringer7f8a4362015-08-26 11:31:48 -0700480int ovs_ct_execute(struct net *net, struct sk_buff *skb,
481 struct sw_flow_key *key,
482 const struct ovs_conntrack_info *info)
483{
484 int nh_ofs;
485 int err;
486
487 /* The conntrack module expects to be working at L3. */
488 nh_ofs = skb_network_offset(skb);
489 skb_pull(skb, nh_ofs);
490
491 if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
492 err = handle_fragments(net, key, info->zone.id, skb);
493 if (err)
494 return err;
495 }
496
Joe Stringerab38a7b2015-10-06 11:00:01 -0700497 if (info->commit)
Joe Stringer7f8a4362015-08-26 11:31:48 -0700498 err = ovs_ct_commit(net, key, info, skb);
499 else
500 err = ovs_ct_lookup(net, key, info, skb);
Joe Stringer182e3042015-08-26 11:31:49 -0700501 if (err)
502 goto err;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700503
Joe Stringerc2ac6672015-08-26 11:31:52 -0700504 if (info->mark.mask) {
Joe Stringer182e3042015-08-26 11:31:49 -0700505 err = ovs_ct_set_mark(skb, key, info->mark.value,
506 info->mark.mask);
Joe Stringerc2ac6672015-08-26 11:31:52 -0700507 if (err)
508 goto err;
509 }
Joe Stringer33db4122015-10-01 15:00:37 -0700510 if (labels_nonzero(&info->labels.mask))
511 err = ovs_ct_set_labels(skb, key, &info->labels.value,
512 &info->labels.mask);
Joe Stringer182e3042015-08-26 11:31:49 -0700513err:
Joe Stringer7f8a4362015-08-26 11:31:48 -0700514 skb_push(skb, nh_ofs);
Joe Stringer74c16612015-10-25 20:21:48 -0700515 if (err)
516 kfree_skb(skb);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700517 return err;
518}
519
Joe Stringercae3a262015-08-26 11:31:53 -0700520static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
521 const struct sw_flow_key *key, bool log)
522{
523 struct nf_conntrack_helper *helper;
524 struct nf_conn_help *help;
525
526 helper = nf_conntrack_helper_try_module_get(name, info->family,
527 key->ip.proto);
528 if (!helper) {
529 OVS_NLERR(log, "Unknown helper \"%s\"", name);
530 return -EINVAL;
531 }
532
533 help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL);
534 if (!help) {
535 module_put(helper->me);
536 return -ENOMEM;
537 }
538
539 rcu_assign_pointer(help->helper, helper);
540 info->helper = helper;
541 return 0;
542}
543
Joe Stringer7f8a4362015-08-26 11:31:48 -0700544static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
Joe Stringerab38a7b2015-10-06 11:00:01 -0700545 [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 },
Joe Stringer7f8a4362015-08-26 11:31:48 -0700546 [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16),
547 .maxlen = sizeof(u16) },
Joe Stringer182e3042015-08-26 11:31:49 -0700548 [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark),
549 .maxlen = sizeof(struct md_mark) },
Joe Stringer33db4122015-10-01 15:00:37 -0700550 [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels),
551 .maxlen = sizeof(struct md_labels) },
Joe Stringercae3a262015-08-26 11:31:53 -0700552 [OVS_CT_ATTR_HELPER] = { .minlen = 1,
553 .maxlen = NF_CT_HELPER_NAME_LEN }
Joe Stringer7f8a4362015-08-26 11:31:48 -0700554};
555
556static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
Joe Stringercae3a262015-08-26 11:31:53 -0700557 const char **helper, bool log)
Joe Stringer7f8a4362015-08-26 11:31:48 -0700558{
559 struct nlattr *a;
560 int rem;
561
562 nla_for_each_nested(a, attr, rem) {
563 int type = nla_type(a);
564 int maxlen = ovs_ct_attr_lens[type].maxlen;
565 int minlen = ovs_ct_attr_lens[type].minlen;
566
567 if (type > OVS_CT_ATTR_MAX) {
568 OVS_NLERR(log,
569 "Unknown conntrack attr (type=%d, max=%d)",
570 type, OVS_CT_ATTR_MAX);
571 return -EINVAL;
572 }
573 if (nla_len(a) < minlen || nla_len(a) > maxlen) {
574 OVS_NLERR(log,
575 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
576 type, nla_len(a), maxlen);
577 return -EINVAL;
578 }
579
580 switch (type) {
Joe Stringerab38a7b2015-10-06 11:00:01 -0700581 case OVS_CT_ATTR_COMMIT:
582 info->commit = true;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700583 break;
584#ifdef CONFIG_NF_CONNTRACK_ZONES
585 case OVS_CT_ATTR_ZONE:
586 info->zone.id = nla_get_u16(a);
587 break;
588#endif
Joe Stringer182e3042015-08-26 11:31:49 -0700589#ifdef CONFIG_NF_CONNTRACK_MARK
590 case OVS_CT_ATTR_MARK: {
591 struct md_mark *mark = nla_data(a);
592
Joe Stringere754ec62015-10-19 19:19:00 -0700593 if (!mark->mask) {
594 OVS_NLERR(log, "ct_mark mask cannot be 0");
595 return -EINVAL;
596 }
Joe Stringer182e3042015-08-26 11:31:49 -0700597 info->mark = *mark;
598 break;
599 }
600#endif
Joe Stringerc2ac6672015-08-26 11:31:52 -0700601#ifdef CONFIG_NF_CONNTRACK_LABELS
Joe Stringer33db4122015-10-01 15:00:37 -0700602 case OVS_CT_ATTR_LABELS: {
603 struct md_labels *labels = nla_data(a);
Joe Stringerc2ac6672015-08-26 11:31:52 -0700604
Joe Stringere754ec62015-10-19 19:19:00 -0700605 if (!labels_nonzero(&labels->mask)) {
606 OVS_NLERR(log, "ct_labels mask cannot be 0");
607 return -EINVAL;
608 }
Joe Stringer33db4122015-10-01 15:00:37 -0700609 info->labels = *labels;
Joe Stringerc2ac6672015-08-26 11:31:52 -0700610 break;
611 }
612#endif
Joe Stringercae3a262015-08-26 11:31:53 -0700613 case OVS_CT_ATTR_HELPER:
614 *helper = nla_data(a);
615 if (!memchr(*helper, '\0', nla_len(a))) {
616 OVS_NLERR(log, "Invalid conntrack helper");
617 return -EINVAL;
618 }
619 break;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700620 default:
621 OVS_NLERR(log, "Unknown conntrack attr (%d)",
622 type);
623 return -EINVAL;
624 }
625 }
626
627 if (rem > 0) {
628 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
629 return -EINVAL;
630 }
631
632 return 0;
633}
634
Joe Stringerc2ac6672015-08-26 11:31:52 -0700635bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
Joe Stringer7f8a4362015-08-26 11:31:48 -0700636{
637 if (attr == OVS_KEY_ATTR_CT_STATE)
638 return true;
639 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
640 attr == OVS_KEY_ATTR_CT_ZONE)
641 return true;
Joe Stringer182e3042015-08-26 11:31:49 -0700642 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
643 attr == OVS_KEY_ATTR_CT_MARK)
644 return true;
Joe Stringerc2ac6672015-08-26 11:31:52 -0700645 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
Joe Stringer33db4122015-10-01 15:00:37 -0700646 attr == OVS_KEY_ATTR_CT_LABELS) {
Joe Stringerc2ac6672015-08-26 11:31:52 -0700647 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
648
649 return ovs_net->xt_label;
650 }
Joe Stringer7f8a4362015-08-26 11:31:48 -0700651
652 return false;
653}
654
655int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
656 const struct sw_flow_key *key,
657 struct sw_flow_actions **sfa, bool log)
658{
659 struct ovs_conntrack_info ct_info;
Joe Stringercae3a262015-08-26 11:31:53 -0700660 const char *helper = NULL;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700661 u16 family;
662 int err;
663
664 family = key_to_nfproto(key);
665 if (family == NFPROTO_UNSPEC) {
666 OVS_NLERR(log, "ct family unspecified");
667 return -EINVAL;
668 }
669
670 memset(&ct_info, 0, sizeof(ct_info));
671 ct_info.family = family;
672
673 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
674 NF_CT_DEFAULT_ZONE_DIR, 0);
675
Joe Stringercae3a262015-08-26 11:31:53 -0700676 err = parse_ct(attr, &ct_info, &helper, log);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700677 if (err)
678 return err;
679
680 /* Set up template for tracking connections in specific zones. */
681 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
682 if (!ct_info.ct) {
683 OVS_NLERR(log, "Failed to allocate conntrack template");
684 return -ENOMEM;
685 }
Joe Stringer90c7afc962015-12-23 14:39:27 -0800686
687 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
688 nf_conntrack_get(&ct_info.ct->ct_general);
689
Joe Stringercae3a262015-08-26 11:31:53 -0700690 if (helper) {
691 err = ovs_ct_add_helper(&ct_info, helper, key, log);
692 if (err)
693 goto err_free_ct;
694 }
Joe Stringer7f8a4362015-08-26 11:31:48 -0700695
696 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
697 sizeof(ct_info), log);
698 if (err)
699 goto err_free_ct;
700
Joe Stringer7f8a4362015-08-26 11:31:48 -0700701 return 0;
702err_free_ct:
Joe Stringer2f3ab9f2015-12-09 14:07:39 -0800703 __ovs_ct_free_action(&ct_info);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700704 return err;
705}
706
707int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
708 struct sk_buff *skb)
709{
710 struct nlattr *start;
711
712 start = nla_nest_start(skb, OVS_ACTION_ATTR_CT);
713 if (!start)
714 return -EMSGSIZE;
715
Joe Stringerab38a7b2015-10-06 11:00:01 -0700716 if (ct_info->commit && nla_put_flag(skb, OVS_CT_ATTR_COMMIT))
Joe Stringer7f8a4362015-08-26 11:31:48 -0700717 return -EMSGSIZE;
718 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
719 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
720 return -EMSGSIZE;
Joe Stringere754ec62015-10-19 19:19:00 -0700721 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
Joe Stringer182e3042015-08-26 11:31:49 -0700722 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
723 &ct_info->mark))
724 return -EMSGSIZE;
Joe Stringerc2ac6672015-08-26 11:31:52 -0700725 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
Joe Stringere754ec62015-10-19 19:19:00 -0700726 labels_nonzero(&ct_info->labels.mask) &&
Joe Stringer33db4122015-10-01 15:00:37 -0700727 nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
728 &ct_info->labels))
Joe Stringerc2ac6672015-08-26 11:31:52 -0700729 return -EMSGSIZE;
Joe Stringercae3a262015-08-26 11:31:53 -0700730 if (ct_info->helper) {
731 if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
732 ct_info->helper->name))
733 return -EMSGSIZE;
734 }
Joe Stringer7f8a4362015-08-26 11:31:48 -0700735
736 nla_nest_end(skb, start);
737
738 return 0;
739}
740
741void ovs_ct_free_action(const struct nlattr *a)
742{
743 struct ovs_conntrack_info *ct_info = nla_data(a);
744
Joe Stringer2f3ab9f2015-12-09 14:07:39 -0800745 __ovs_ct_free_action(ct_info);
746}
747
748static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
749{
Joe Stringercae3a262015-08-26 11:31:53 -0700750 if (ct_info->helper)
751 module_put(ct_info->helper->me);
Joe Stringer7f8a4362015-08-26 11:31:48 -0700752 if (ct_info->ct)
753 nf_ct_put(ct_info->ct);
754}
Joe Stringerc2ac6672015-08-26 11:31:52 -0700755
756void ovs_ct_init(struct net *net)
757{
Joe Stringer33db4122015-10-01 15:00:37 -0700758 unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
Joe Stringerc2ac6672015-08-26 11:31:52 -0700759 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
760
761 if (nf_connlabels_get(net, n_bits)) {
762 ovs_net->xt_label = false;
763 OVS_NLERR(true, "Failed to set connlabel length");
764 } else {
765 ovs_net->xt_label = true;
766 }
767}
768
769void ovs_ct_exit(struct net *net)
770{
771 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
772
773 if (ovs_net->xt_label)
774 nf_connlabels_put(net);
775}