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a94ebc39 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/kconfig.h> | |
15 | #include <linux/version.h> | |
16 | ||
8063e095 | 17 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
a94ebc39 JS |
18 | |
19 | #include <linux/module.h> | |
20 | #include <linux/openvswitch.h> | |
f8f97cdc JR |
21 | #include <linux/tcp.h> |
22 | #include <linux/udp.h> | |
23 | #include <linux/sctp.h> | |
a94ebc39 JS |
24 | #include <net/ip.h> |
25 | #include <net/netfilter/nf_conntrack_core.h> | |
11251c17 | 26 | #include <net/netfilter/nf_conntrack_helper.h> |
038e34ab | 27 | #include <net/netfilter/nf_conntrack_labels.h> |
f8f97cdc | 28 | #include <net/netfilter/nf_conntrack_seqadj.h> |
a94ebc39 JS |
29 | #include <net/netfilter/nf_conntrack_zones.h> |
30 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> | |
31 | ||
f8f97cdc JR |
32 | #ifdef CONFIG_NF_NAT_NEEDED |
33 | #include <linux/netfilter/nf_nat.h> | |
34 | #include <net/netfilter/nf_nat_core.h> | |
35 | #include <net/netfilter/nf_nat_l3proto.h> | |
36 | #endif | |
37 | ||
a94ebc39 JS |
38 | #include "datapath.h" |
39 | #include "conntrack.h" | |
40 | #include "flow.h" | |
41 | #include "flow_netlink.h" | |
86c2eb45 | 42 | #include "gso.h" |
a94ebc39 JS |
43 | |
44 | struct ovs_ct_len_tbl { | |
f8f97cdc JR |
45 | int maxlen; |
46 | int minlen; | |
a94ebc39 JS |
47 | }; |
48 | ||
372ce973 JS |
49 | /* Metadata mark for masked write to conntrack mark */ |
50 | struct md_mark { | |
51 | u32 value; | |
52 | u32 mask; | |
53 | }; | |
54 | ||
038e34ab | 55 | /* Metadata label for masked write to conntrack label. */ |
c05e2094 JS |
56 | struct md_labels { |
57 | struct ovs_key_ct_labels value; | |
58 | struct ovs_key_ct_labels mask; | |
038e34ab JS |
59 | }; |
60 | ||
f8f97cdc JR |
61 | enum ovs_ct_nat { |
62 | OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ | |
63 | OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ | |
64 | OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */ | |
65 | }; | |
66 | ||
a94ebc39 JS |
67 | /* Conntrack action context for execution. */ |
68 | struct ovs_conntrack_info { | |
11251c17 | 69 | struct nf_conntrack_helper *helper; |
a94ebc39 JS |
70 | struct nf_conntrack_zone zone; |
71 | struct nf_conn *ct; | |
c05e2094 | 72 | u8 commit : 1; |
f8f97cdc | 73 | u8 nat : 3; /* enum ovs_ct_nat */ |
9f1de150 | 74 | u8 random_fully_compat : 1; /* bool */ |
a94ebc39 | 75 | u16 family; |
372ce973 | 76 | struct md_mark mark; |
c05e2094 | 77 | struct md_labels labels; |
f8f97cdc JR |
78 | #ifdef CONFIG_NF_NAT_NEEDED |
79 | struct nf_nat_range range; /* Only present for SRC NAT and DST NAT. */ | |
80 | #endif | |
a94ebc39 JS |
81 | }; |
82 | ||
11251c17 JS |
83 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); |
84 | ||
a94ebc39 JS |
85 | static u16 key_to_nfproto(const struct sw_flow_key *key) |
86 | { | |
87 | switch (ntohs(key->eth.type)) { | |
88 | case ETH_P_IP: | |
89 | return NFPROTO_IPV4; | |
90 | case ETH_P_IPV6: | |
91 | return NFPROTO_IPV6; | |
92 | default: | |
93 | return NFPROTO_UNSPEC; | |
94 | } | |
95 | } | |
96 | ||
97 | /* Map SKB connection state into the values used by flow definition. */ | |
98 | static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) | |
99 | { | |
100 | u8 ct_state = OVS_CS_F_TRACKED; | |
101 | ||
102 | switch (ctinfo) { | |
103 | case IP_CT_ESTABLISHED_REPLY: | |
104 | case IP_CT_RELATED_REPLY: | |
a94ebc39 JS |
105 | ct_state |= OVS_CS_F_REPLY_DIR; |
106 | break; | |
107 | default: | |
108 | break; | |
109 | } | |
110 | ||
111 | switch (ctinfo) { | |
112 | case IP_CT_ESTABLISHED: | |
113 | case IP_CT_ESTABLISHED_REPLY: | |
114 | ct_state |= OVS_CS_F_ESTABLISHED; | |
115 | break; | |
116 | case IP_CT_RELATED: | |
117 | case IP_CT_RELATED_REPLY: | |
118 | ct_state |= OVS_CS_F_RELATED; | |
119 | break; | |
120 | case IP_CT_NEW: | |
a94ebc39 JS |
121 | ct_state |= OVS_CS_F_NEW; |
122 | break; | |
123 | default: | |
124 | break; | |
125 | } | |
126 | ||
127 | return ct_state; | |
128 | } | |
129 | ||
c05e2094 JS |
130 | static u32 ovs_ct_get_mark(const struct nf_conn *ct) |
131 | { | |
132 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) | |
133 | return ct ? ct->mark : 0; | |
134 | #else | |
135 | return 0; | |
136 | #endif | |
137 | } | |
138 | ||
9f04eabe JR |
139 | static size_t ovs_ct_get_labels_len(struct nf_conn_labels *cl) |
140 | { | |
141 | #ifdef HAVE_NF_CONN_LABELS_WITH_WORDS | |
142 | return cl->words * sizeof(long); | |
143 | #else | |
144 | return sizeof(cl->bits); | |
145 | #endif | |
146 | } | |
147 | ||
c05e2094 JS |
148 | static void ovs_ct_get_labels(const struct nf_conn *ct, |
149 | struct ovs_key_ct_labels *labels) | |
038e34ab JS |
150 | { |
151 | struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; | |
152 | ||
153 | if (cl) { | |
9f04eabe | 154 | size_t len = ovs_ct_get_labels_len(cl); |
038e34ab | 155 | |
c05e2094 JS |
156 | if (len > OVS_CT_LABELS_LEN) |
157 | len = OVS_CT_LABELS_LEN; | |
158 | else if (len < OVS_CT_LABELS_LEN) | |
159 | memset(labels, 0, OVS_CT_LABELS_LEN); | |
160 | memcpy(labels, cl->bits, len); | |
038e34ab | 161 | } else { |
c05e2094 | 162 | memset(labels, 0, OVS_CT_LABELS_LEN); |
038e34ab JS |
163 | } |
164 | } | |
165 | ||
a94ebc39 | 166 | static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, |
372ce973 JS |
167 | const struct nf_conntrack_zone *zone, |
168 | const struct nf_conn *ct) | |
a94ebc39 JS |
169 | { |
170 | key->ct.state = state; | |
171 | key->ct.zone = zone->id; | |
c05e2094 JS |
172 | key->ct.mark = ovs_ct_get_mark(ct); |
173 | ovs_ct_get_labels(ct, &key->ct.labels); | |
a94ebc39 JS |
174 | } |
175 | ||
e3c42eb8 | 176 | /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has |
f8f97cdc JR |
177 | * previously sent the packet to conntrack via the ct action. If |
178 | * 'keep_nat_flags' is true, the existing NAT flags retained, else they are | |
179 | * initialized from the connection status. | |
a94ebc39 JS |
180 | */ |
181 | static void ovs_ct_update_key(const struct sk_buff *skb, | |
f23593a1 | 182 | const struct ovs_conntrack_info *info, |
f8f97cdc JR |
183 | struct sw_flow_key *key, bool post_ct, |
184 | bool keep_nat_flags) | |
a94ebc39 JS |
185 | { |
186 | const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; | |
187 | enum ip_conntrack_info ctinfo; | |
188 | struct nf_conn *ct; | |
189 | u8 state = 0; | |
190 | ||
191 | ct = nf_ct_get(skb, &ctinfo); | |
192 | if (ct) { | |
193 | state = ovs_ct_get_state(ctinfo); | |
b0f251cd | 194 | /* All unconfirmed entries are NEW connections. */ |
c05e2094 JS |
195 | if (!nf_ct_is_confirmed(ct)) |
196 | state |= OVS_CS_F_NEW; | |
b0f251cd JR |
197 | /* OVS persists the related flag for the duration of the |
198 | * connection. | |
199 | */ | |
a94ebc39 JS |
200 | if (ct->master) |
201 | state |= OVS_CS_F_RELATED; | |
f8f97cdc JR |
202 | if (keep_nat_flags) { |
203 | state |= key->ct.state & OVS_CS_F_NAT_MASK; | |
204 | } else { | |
205 | if (ct->status & IPS_SRC_NAT) | |
206 | state |= OVS_CS_F_SRC_NAT; | |
207 | if (ct->status & IPS_DST_NAT) | |
208 | state |= OVS_CS_F_DST_NAT; | |
209 | } | |
a94ebc39 JS |
210 | zone = nf_ct_zone(ct); |
211 | } else if (post_ct) { | |
212 | state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; | |
f23593a1 JS |
213 | if (info) |
214 | zone = &info->zone; | |
a94ebc39 | 215 | } |
372ce973 | 216 | __ovs_ct_update_key(key, state, zone, ct); |
a94ebc39 JS |
217 | } |
218 | ||
b0f251cd JR |
219 | /* This is called to initialize CT key fields possibly coming in from the local |
220 | * stack. | |
221 | */ | |
a94ebc39 JS |
222 | void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) |
223 | { | |
f8f97cdc | 224 | ovs_ct_update_key(skb, NULL, key, false, false); |
a94ebc39 JS |
225 | } |
226 | ||
227 | int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb) | |
228 | { | |
c05e2094 | 229 | if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state)) |
a94ebc39 JS |
230 | return -EMSGSIZE; |
231 | ||
232 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
233 | nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone)) | |
234 | return -EMSGSIZE; | |
235 | ||
372ce973 JS |
236 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
237 | nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark)) | |
238 | return -EMSGSIZE; | |
239 | ||
c05e2094 JS |
240 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
241 | nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(key->ct.labels), | |
242 | &key->ct.labels)) | |
038e34ab JS |
243 | return -EMSGSIZE; |
244 | ||
372ce973 JS |
245 | return 0; |
246 | } | |
247 | ||
248 | static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key, | |
249 | u32 ct_mark, u32 mask) | |
250 | { | |
c05e2094 | 251 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
372ce973 JS |
252 | enum ip_conntrack_info ctinfo; |
253 | struct nf_conn *ct; | |
254 | u32 new_mark; | |
255 | ||
372ce973 JS |
256 | /* The connection could be invalid, in which case set_mark is no-op. */ |
257 | ct = nf_ct_get(skb, &ctinfo); | |
258 | if (!ct) | |
259 | return 0; | |
260 | ||
261 | new_mark = ct_mark | (ct->mark & ~(mask)); | |
262 | if (ct->mark != new_mark) { | |
263 | ct->mark = new_mark; | |
264 | nf_conntrack_event_cache(IPCT_MARK, ct); | |
265 | key->ct.mark = new_mark; | |
266 | } | |
267 | ||
a94ebc39 | 268 | return 0; |
c05e2094 JS |
269 | #else |
270 | return -ENOTSUPP; | |
271 | #endif | |
a94ebc39 JS |
272 | } |
273 | ||
c05e2094 JS |
274 | static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key, |
275 | const struct ovs_key_ct_labels *labels, | |
276 | const struct ovs_key_ct_labels *mask) | |
038e34ab JS |
277 | { |
278 | enum ip_conntrack_info ctinfo; | |
279 | struct nf_conn_labels *cl; | |
280 | struct nf_conn *ct; | |
281 | int err; | |
282 | ||
038e34ab JS |
283 | /* The connection could be invalid, in which case set_label is no-op.*/ |
284 | ct = nf_ct_get(skb, &ctinfo); | |
285 | if (!ct) | |
286 | return 0; | |
287 | ||
288 | cl = nf_ct_labels_find(ct); | |
289 | if (!cl) { | |
290 | nf_ct_labels_ext_add(ct); | |
291 | cl = nf_ct_labels_find(ct); | |
292 | } | |
9f04eabe JR |
293 | |
294 | if (!cl || ovs_ct_get_labels_len(cl) < OVS_CT_LABELS_LEN) | |
038e34ab JS |
295 | return -ENOSPC; |
296 | ||
c05e2094 JS |
297 | err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask, |
298 | OVS_CT_LABELS_LEN / sizeof(u32)); | |
038e34ab JS |
299 | if (err) |
300 | return err; | |
301 | ||
c05e2094 | 302 | ovs_ct_get_labels(ct, &key->ct.labels); |
038e34ab JS |
303 | return 0; |
304 | } | |
305 | ||
11251c17 JS |
306 | /* 'skb' should already be pulled to nh_ofs. */ |
307 | static int ovs_ct_helper(struct sk_buff *skb, u16 proto) | |
308 | { | |
309 | const struct nf_conntrack_helper *helper; | |
310 | const struct nf_conn_help *help; | |
311 | enum ip_conntrack_info ctinfo; | |
312 | unsigned int protoff; | |
313 | struct nf_conn *ct; | |
4cc85f28 | 314 | u8 nexthdr; |
f8f97cdc | 315 | int err; |
11251c17 | 316 | |
3d47fa46 JH |
317 | #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) |
318 | bool dst_set = false; | |
319 | struct rtable rt = { .rt_flags = 0 }; | |
320 | #endif | |
321 | ||
11251c17 JS |
322 | ct = nf_ct_get(skb, &ctinfo); |
323 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) | |
324 | return NF_ACCEPT; | |
325 | ||
326 | help = nfct_help(ct); | |
327 | if (!help) | |
328 | return NF_ACCEPT; | |
329 | ||
330 | helper = rcu_dereference(help->helper); | |
331 | if (!helper) | |
332 | return NF_ACCEPT; | |
333 | ||
334 | switch (proto) { | |
335 | case NFPROTO_IPV4: | |
336 | protoff = ip_hdrlen(skb); | |
337 | break; | |
338 | case NFPROTO_IPV6: { | |
11251c17 | 339 | __be16 frag_off; |
c05e2094 | 340 | int ofs; |
11251c17 | 341 | |
4cc85f28 | 342 | nexthdr = ipv6_hdr(skb)->nexthdr; |
c05e2094 JS |
343 | ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, |
344 | &frag_off); | |
345 | if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { | |
11251c17 JS |
346 | pr_debug("proto header not found\n"); |
347 | return NF_ACCEPT; | |
348 | } | |
c05e2094 | 349 | protoff = ofs; |
11251c17 JS |
350 | break; |
351 | } | |
352 | default: | |
353 | WARN_ONCE(1, "helper invoked on non-IP family!"); | |
354 | return NF_DROP; | |
355 | } | |
356 | ||
4cc85f28 JR |
357 | #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) |
358 | /* Linux 4.5 and older depend on skb_dst being set when recalculating | |
359 | * checksums after NAT helper has mangled TCP or UDP packet payload. | |
3d47fa46 JH |
360 | * skb_dst is cast to a rtable struct and the flags examined. |
361 | * Forcing these flags to have RTCF_LOCAL not set ensures checksum mod | |
362 | * is carried out in the same way as kernel versions > 4.5 | |
4cc85f28 | 363 | */ |
3d47fa46 JH |
364 | if (ct->status & IPS_NAT_MASK && skb->ip_summed != CHECKSUM_PARTIAL |
365 | && !skb_dst(skb)) { | |
366 | dst_set = true; | |
367 | skb_dst_set(skb, &rt.dst); | |
4cc85f28 JR |
368 | } |
369 | #endif | |
f8f97cdc JR |
370 | err = helper->help(skb, protoff, ct, ctinfo); |
371 | if (err != NF_ACCEPT) | |
372 | return err; | |
373 | ||
3d47fa46 JH |
374 | #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) |
375 | if (dst_set) | |
376 | skb_dst_set(skb, NULL); | |
377 | #endif | |
378 | ||
f8f97cdc JR |
379 | /* Adjust seqs after helper. This is needed due to some helpers (e.g., |
380 | * FTP with NAT) adusting the TCP payload size when mangling IP | |
381 | * addresses and/or port numbers in the text-based control connection. | |
382 | */ | |
383 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && | |
384 | !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) | |
385 | return NF_DROP; | |
386 | return NF_ACCEPT; | |
11251c17 JS |
387 | } |
388 | ||
c05e2094 JS |
389 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
390 | * value if 'skb' is freed. | |
391 | */ | |
a94ebc39 JS |
392 | static int handle_fragments(struct net *net, struct sw_flow_key *key, |
393 | u16 zone, struct sk_buff *skb) | |
394 | { | |
86c2eb45 | 395 | struct ovs_gso_cb ovs_cb = *OVS_GSO_CB(skb); |
2e602ea3 | 396 | int err; |
a94ebc39 | 397 | |
a94ebc39 JS |
398 | if (key->eth.type == htons(ETH_P_IP)) { |
399 | enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; | |
a94ebc39 JS |
400 | |
401 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
39c0ff22 | 402 | err = ip_defrag(net, skb, user); |
a94ebc39 JS |
403 | if (err) |
404 | return err; | |
405 | ||
86c2eb45 | 406 | ovs_cb.dp_cb.mru = IPCB(skb)->frag_max_size; |
a94ebc39 | 407 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
c05e2094 | 408 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
a94ebc39 | 409 | enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; |
a94ebc39 | 410 | |
66ec6da8 | 411 | skb_orphan(skb); |
a94ebc39 | 412 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
2e602ea3 | 413 | err = nf_ct_frag6_gather(net, skb, user); |
6b4fe5a9 DDP |
414 | if (err) { |
415 | if (err != -EINPROGRESS) | |
416 | kfree_skb(skb); | |
2e602ea3 | 417 | return err; |
6b4fe5a9 | 418 | } |
a94ebc39 | 419 | |
2e602ea3 | 420 | key->ip.proto = ipv6_hdr(skb)->nexthdr; |
86c2eb45 | 421 | ovs_cb.dp_cb.mru = IP6CB(skb)->frag_max_size; |
a94ebc39 JS |
422 | #endif /* IP frag support */ |
423 | } else { | |
c05e2094 | 424 | kfree_skb(skb); |
a94ebc39 JS |
425 | return -EPFNOSUPPORT; |
426 | } | |
427 | ||
428 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
429 | skb_clear_hash(skb); | |
430 | skb->ignore_df = 1; | |
86c2eb45 | 431 | *OVS_GSO_CB(skb) = ovs_cb; |
a94ebc39 JS |
432 | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static struct nf_conntrack_expect * | |
437 | ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, | |
438 | u16 proto, const struct sk_buff *skb) | |
439 | { | |
440 | struct nf_conntrack_tuple tuple; | |
441 | ||
fa67f8e0 | 442 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple)) |
a94ebc39 JS |
443 | return NULL; |
444 | return __nf_ct_expect_find(net, zone, &tuple); | |
445 | } | |
446 | ||
3dd9e118 JR |
447 | /* This replicates logic from nf_conntrack_core.c that is not exported. */ |
448 | static enum ip_conntrack_info | |
449 | ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h) | |
450 | { | |
451 | const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
452 | ||
453 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) | |
454 | return IP_CT_ESTABLISHED_REPLY; | |
455 | /* Once we've had two way comms, always ESTABLISHED. */ | |
456 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
457 | return IP_CT_ESTABLISHED; | |
458 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
459 | return IP_CT_RELATED; | |
460 | return IP_CT_NEW; | |
461 | } | |
462 | ||
463 | /* Find an existing connection which this packet belongs to without | |
464 | * re-attributing statistics or modifying the connection state. This allows an | |
e3c42eb8 | 465 | * skb->_nfct lost due to an upcall to be recovered during actions execution. |
3dd9e118 JR |
466 | * |
467 | * Must be called with rcu_read_lock. | |
468 | * | |
e3c42eb8 JR |
469 | * On success, populates skb->_nfct and returns the connection. Returns NULL |
470 | * if there is no existing entry. | |
3dd9e118 JR |
471 | */ |
472 | static struct nf_conn * | |
473 | ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone, | |
c0324e37 | 474 | u8 l3num, struct sk_buff *skb, bool natted) |
3dd9e118 JR |
475 | { |
476 | struct nf_conntrack_l3proto *l3proto; | |
477 | struct nf_conntrack_l4proto *l4proto; | |
478 | struct nf_conntrack_tuple tuple; | |
479 | struct nf_conntrack_tuple_hash *h; | |
3dd9e118 JR |
480 | struct nf_conn *ct; |
481 | unsigned int dataoff; | |
482 | u8 protonum; | |
483 | ||
484 | l3proto = __nf_ct_l3proto_find(l3num); | |
3dd9e118 JR |
485 | if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff, |
486 | &protonum) <= 0) { | |
487 | pr_debug("ovs_ct_find_existing: Can't get protonum\n"); | |
488 | return NULL; | |
489 | } | |
490 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
3dd9e118 JR |
491 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num, |
492 | protonum, net, &tuple, l3proto, l4proto)) { | |
493 | pr_debug("ovs_ct_find_existing: Can't get tuple\n"); | |
494 | return NULL; | |
495 | } | |
496 | ||
c0324e37 JR |
497 | /* Must invert the tuple if skb has been transformed by NAT. */ |
498 | if (natted) { | |
499 | struct nf_conntrack_tuple inverse; | |
500 | ||
501 | if (!nf_ct_invert_tuple(&inverse, &tuple, l3proto, l4proto)) { | |
502 | pr_debug("ovs_ct_find_existing: Inversion failed!\n"); | |
503 | return NULL; | |
504 | } | |
505 | tuple = inverse; | |
506 | } | |
507 | ||
3dd9e118 JR |
508 | /* look for tuple match */ |
509 | h = nf_conntrack_find_get(net, zone, &tuple); | |
510 | if (!h) | |
511 | return NULL; /* Not found. */ | |
512 | ||
513 | ct = nf_ct_tuplehash_to_ctrack(h); | |
514 | ||
c0324e37 JR |
515 | /* Inverted packet tuple matches the reverse direction conntrack tuple, |
516 | * select the other tuplehash to get the right 'ctinfo' bits for this | |
517 | * packet. | |
518 | */ | |
519 | if (natted) | |
520 | h = &ct->tuplehash[!h->tuple.dst.dir]; | |
521 | ||
dfa791b2 | 522 | nf_ct_set(skb, ct, ovs_ct_get_info(h)); |
3dd9e118 JR |
523 | return ct; |
524 | } | |
525 | ||
e3c42eb8 | 526 | /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */ |
3dd9e118 JR |
527 | static bool skb_nfct_cached(struct net *net, |
528 | const struct sw_flow_key *key, | |
529 | const struct ovs_conntrack_info *info, | |
530 | struct sk_buff *skb) | |
a94ebc39 JS |
531 | { |
532 | enum ip_conntrack_info ctinfo; | |
533 | struct nf_conn *ct; | |
534 | ||
535 | ct = nf_ct_get(skb, &ctinfo); | |
3dd9e118 | 536 | /* If no ct, check if we have evidence that an existing conntrack entry |
e3c42eb8 | 537 | * might be found for this skb. This happens when we lose a skb->_nfct |
3dd9e118 JR |
538 | * due to an upcall. If the connection was not confirmed, it is not |
539 | * cached and needs to be run through conntrack again. | |
540 | */ | |
541 | if (!ct && key->ct.state & OVS_CS_F_TRACKED && | |
542 | !(key->ct.state & OVS_CS_F_INVALID) && | |
543 | key->ct.zone == info->zone.id) | |
c0324e37 JR |
544 | ct = ovs_ct_find_existing(net, &info->zone, info->family, skb, |
545 | !!(key->ct.state | |
546 | & OVS_CS_F_NAT_MASK)); | |
a94ebc39 JS |
547 | if (!ct) |
548 | return false; | |
549 | if (!net_eq(net, read_pnet(&ct->ct_net))) | |
550 | return false; | |
551 | if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) | |
552 | return false; | |
11251c17 JS |
553 | if (info->helper) { |
554 | struct nf_conn_help *help; | |
555 | ||
556 | help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); | |
557 | if (help && rcu_access_pointer(help->helper) != info->helper) | |
558 | return false; | |
559 | } | |
a94ebc39 JS |
560 | |
561 | return true; | |
562 | } | |
563 | ||
f8f97cdc JR |
564 | #ifdef CONFIG_NF_NAT_NEEDED |
565 | /* Modelled after nf_nat_ipv[46]_fn(). | |
566 | * range is only used for new, uninitialized NAT state. | |
567 | * Returns either NF_ACCEPT or NF_DROP. | |
568 | */ | |
569 | static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct, | |
570 | enum ip_conntrack_info ctinfo, | |
571 | const struct nf_nat_range *range, | |
572 | enum nf_nat_manip_type maniptype) | |
573 | { | |
574 | int hooknum, nh_off, err = NF_ACCEPT; | |
575 | ||
576 | nh_off = skb_network_offset(skb); | |
073c7b86 | 577 | skb_pull_rcsum(skb, nh_off); |
f8f97cdc JR |
578 | |
579 | /* See HOOK2MANIP(). */ | |
580 | if (maniptype == NF_NAT_MANIP_SRC) | |
581 | hooknum = NF_INET_LOCAL_IN; /* Source NAT */ | |
582 | else | |
583 | hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */ | |
584 | ||
585 | switch (ctinfo) { | |
586 | case IP_CT_RELATED: | |
587 | case IP_CT_RELATED_REPLY: | |
90b01477 AB |
588 | if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && |
589 | skb->protocol == htons(ETH_P_IP) && | |
f8f97cdc JR |
590 | ip_hdr(skb)->protocol == IPPROTO_ICMP) { |
591 | if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, | |
592 | hooknum)) | |
593 | err = NF_DROP; | |
594 | goto push; | |
90b01477 AB |
595 | } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && |
596 | skb->protocol == htons(ETH_P_IPV6)) { | |
f8f97cdc JR |
597 | __be16 frag_off; |
598 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; | |
599 | int hdrlen = ipv6_skip_exthdr(skb, | |
600 | sizeof(struct ipv6hdr), | |
601 | &nexthdr, &frag_off); | |
602 | ||
603 | if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) { | |
604 | if (!nf_nat_icmpv6_reply_translation(skb, ct, | |
605 | ctinfo, | |
606 | hooknum, | |
607 | hdrlen)) | |
608 | err = NF_DROP; | |
609 | goto push; | |
610 | } | |
f8f97cdc JR |
611 | } |
612 | /* Non-ICMP, fall thru to initialize if needed. */ | |
613 | case IP_CT_NEW: | |
614 | /* Seen it before? This can happen for loopback, retrans, | |
615 | * or local packets. | |
616 | */ | |
617 | if (!nf_nat_initialized(ct, maniptype)) { | |
618 | /* Initialize according to the NAT action. */ | |
619 | err = (range && range->flags & NF_NAT_RANGE_MAP_IPS) | |
620 | /* Action is set up to establish a new | |
621 | * mapping. | |
622 | */ | |
623 | ? nf_nat_setup_info(ct, range, maniptype) | |
624 | : nf_nat_alloc_null_binding(ct, hooknum); | |
625 | if (err != NF_ACCEPT) | |
626 | goto push; | |
627 | } | |
628 | break; | |
629 | ||
630 | case IP_CT_ESTABLISHED: | |
631 | case IP_CT_ESTABLISHED_REPLY: | |
632 | break; | |
633 | ||
634 | default: | |
635 | err = NF_DROP; | |
636 | goto push; | |
637 | } | |
638 | ||
639 | err = nf_nat_packet(ct, ctinfo, hooknum, skb); | |
640 | push: | |
641 | skb_push(skb, nh_off); | |
073c7b86 | 642 | skb_postpush_rcsum(skb, skb->data, nh_off); |
f8f97cdc JR |
643 | |
644 | return err; | |
645 | } | |
646 | ||
647 | static void ovs_nat_update_key(struct sw_flow_key *key, | |
648 | const struct sk_buff *skb, | |
649 | enum nf_nat_manip_type maniptype) | |
650 | { | |
651 | if (maniptype == NF_NAT_MANIP_SRC) { | |
652 | __be16 src; | |
653 | ||
654 | key->ct.state |= OVS_CS_F_SRC_NAT; | |
655 | if (key->eth.type == htons(ETH_P_IP)) | |
656 | key->ipv4.addr.src = ip_hdr(skb)->saddr; | |
657 | else if (key->eth.type == htons(ETH_P_IPV6)) | |
658 | memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr, | |
659 | sizeof(key->ipv6.addr.src)); | |
660 | else | |
661 | return; | |
662 | ||
663 | if (key->ip.proto == IPPROTO_UDP) | |
664 | src = udp_hdr(skb)->source; | |
665 | else if (key->ip.proto == IPPROTO_TCP) | |
666 | src = tcp_hdr(skb)->source; | |
667 | else if (key->ip.proto == IPPROTO_SCTP) | |
668 | src = sctp_hdr(skb)->source; | |
669 | else | |
670 | return; | |
671 | ||
672 | key->tp.src = src; | |
673 | } else { | |
674 | __be16 dst; | |
675 | ||
676 | key->ct.state |= OVS_CS_F_DST_NAT; | |
677 | if (key->eth.type == htons(ETH_P_IP)) | |
678 | key->ipv4.addr.dst = ip_hdr(skb)->daddr; | |
679 | else if (key->eth.type == htons(ETH_P_IPV6)) | |
680 | memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr, | |
681 | sizeof(key->ipv6.addr.dst)); | |
682 | else | |
683 | return; | |
684 | ||
685 | if (key->ip.proto == IPPROTO_UDP) | |
686 | dst = udp_hdr(skb)->dest; | |
687 | else if (key->ip.proto == IPPROTO_TCP) | |
688 | dst = tcp_hdr(skb)->dest; | |
689 | else if (key->ip.proto == IPPROTO_SCTP) | |
690 | dst = sctp_hdr(skb)->dest; | |
691 | else | |
692 | return; | |
693 | ||
694 | key->tp.dst = dst; | |
695 | } | |
696 | } | |
697 | ||
698 | /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */ | |
699 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, | |
700 | const struct ovs_conntrack_info *info, | |
701 | struct sk_buff *skb, struct nf_conn *ct, | |
702 | enum ip_conntrack_info ctinfo) | |
703 | { | |
704 | enum nf_nat_manip_type maniptype; | |
705 | int err; | |
706 | ||
707 | if (nf_ct_is_untracked(ct)) { | |
708 | /* A NAT action may only be performed on tracked packets. */ | |
709 | return NF_ACCEPT; | |
710 | } | |
711 | ||
712 | /* Add NAT extension if not confirmed yet. */ | |
713 | if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct)) | |
714 | return NF_ACCEPT; /* Can't NAT. */ | |
715 | ||
716 | /* Determine NAT type. | |
717 | * Check if the NAT type can be deduced from the tracked connection. | |
d2e8b514 JR |
718 | * Make sure new expected connections (IP_CT_RELATED) are NATted only |
719 | * when committing. | |
f8f97cdc JR |
720 | */ |
721 | if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW && | |
722 | ct->status & IPS_NAT_MASK && | |
d2e8b514 | 723 | (ctinfo != IP_CT_RELATED || info->commit)) { |
f8f97cdc JR |
724 | /* NAT an established or related connection like before. */ |
725 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) | |
726 | /* This is the REPLY direction for a connection | |
727 | * for which NAT was applied in the forward | |
728 | * direction. Do the reverse NAT. | |
729 | */ | |
730 | maniptype = ct->status & IPS_SRC_NAT | |
731 | ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC; | |
732 | else | |
733 | maniptype = ct->status & IPS_SRC_NAT | |
734 | ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST; | |
735 | } else if (info->nat & OVS_CT_SRC_NAT) { | |
736 | maniptype = NF_NAT_MANIP_SRC; | |
737 | } else if (info->nat & OVS_CT_DST_NAT) { | |
738 | maniptype = NF_NAT_MANIP_DST; | |
739 | } else { | |
740 | return NF_ACCEPT; /* Connection is not NATed. */ | |
741 | } | |
742 | err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype); | |
743 | ||
744 | /* Mark NAT done if successful and update the flow key. */ | |
745 | if (err == NF_ACCEPT) | |
746 | ovs_nat_update_key(key, skb, maniptype); | |
747 | ||
748 | return err; | |
749 | } | |
750 | #else /* !CONFIG_NF_NAT_NEEDED */ | |
751 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, | |
752 | const struct ovs_conntrack_info *info, | |
753 | struct sk_buff *skb, struct nf_conn *ct, | |
754 | enum ip_conntrack_info ctinfo) | |
755 | { | |
756 | return NF_ACCEPT; | |
757 | } | |
758 | #endif | |
759 | ||
b0f251cd | 760 | /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if |
a04a5794 JR |
761 | * not done already. Update key with new CT state after passing the packet |
762 | * through conntrack. | |
e3c42eb8 | 763 | * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be |
b0f251cd JR |
764 | * set to NULL and 0 will be returned. |
765 | */ | |
c05e2094 | 766 | static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, |
a94ebc39 JS |
767 | const struct ovs_conntrack_info *info, |
768 | struct sk_buff *skb) | |
769 | { | |
770 | /* If we are recirculating packets to match on conntrack fields and | |
771 | * committing with a separate conntrack action, then we don't need to | |
772 | * actually run the packet through conntrack twice unless it's for a | |
773 | * different zone. | |
774 | */ | |
b21d237e JR |
775 | bool cached = skb_nfct_cached(net, key, info, skb); |
776 | enum ip_conntrack_info ctinfo; | |
777 | struct nf_conn *ct; | |
778 | ||
779 | if (!cached) { | |
a94ebc39 | 780 | struct nf_conn *tmpl = info->ct; |
9bf67b92 | 781 | int err; |
a94ebc39 JS |
782 | |
783 | /* Associate skb with specified zone. */ | |
784 | if (tmpl) { | |
d3c313c1 FW |
785 | if (skb_nfct(skb)) |
786 | nf_conntrack_put(skb_nfct(skb)); | |
a94ebc39 | 787 | nf_conntrack_get(&tmpl->ct_general); |
dfa791b2 | 788 | nf_ct_set(skb, tmpl, IP_CT_NEW); |
a94ebc39 JS |
789 | } |
790 | ||
a6d28f7c PNA |
791 | err = nf_conntrack_in(net, info->family, |
792 | NF_INET_PRE_ROUTING, skb); | |
9bf67b92 | 793 | if (err != NF_ACCEPT) |
a94ebc39 | 794 | return -ENOENT; |
11251c17 | 795 | |
f8f97cdc JR |
796 | /* Clear CT state NAT flags to mark that we have not yet done |
797 | * NAT after the nf_conntrack_in() call. We can actually clear | |
798 | * the whole state, as it will be re-initialized below. | |
799 | */ | |
800 | key->ct.state = 0; | |
801 | ||
802 | /* Update the key, but keep the NAT flags. */ | |
803 | ovs_ct_update_key(skb, info, key, true, true); | |
b21d237e | 804 | } |
a04a5794 | 805 | |
b21d237e | 806 | ct = nf_ct_get(skb, &ctinfo); |
f8f97cdc JR |
807 | if (ct) { |
808 | /* Packets starting a new connection must be NATted before the | |
809 | * helper, so that the helper knows about the NAT. We enforce | |
810 | * this by delaying both NAT and helper calls for unconfirmed | |
811 | * connections until the committing CT action. For later | |
812 | * packets NAT and Helper may be called in either order. | |
813 | * | |
814 | * NAT will be done only if the CT action has NAT, and only | |
815 | * once per packet (per zone), as guarded by the NAT bits in | |
816 | * the key->ct.state. | |
817 | */ | |
818 | if (info->nat && !(key->ct.state & OVS_CS_F_NAT_MASK) && | |
819 | (nf_ct_is_confirmed(ct) || info->commit) && | |
820 | ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) { | |
821 | return -EINVAL; | |
822 | } | |
823 | ||
b87a5aac JS |
824 | /* Userspace may decide to perform a ct lookup without a helper |
825 | * specified followed by a (recirculate and) commit with one. | |
826 | * Therefore, for unconfirmed connections which we will commit, | |
827 | * we need to attach the helper here. | |
828 | */ | |
829 | if (!nf_ct_is_confirmed(ct) && info->commit && | |
830 | info->helper && !nfct_help(ct)) { | |
831 | int err = __nf_ct_try_assign_helper(ct, info->ct, | |
832 | GFP_ATOMIC); | |
833 | if (err) | |
834 | return err; | |
835 | } | |
836 | ||
f8f97cdc JR |
837 | /* Call the helper only if: |
838 | * - nf_conntrack_in() was executed above ("!cached") for a | |
839 | * confirmed connection, or | |
840 | * - When committing an unconfirmed connection. | |
841 | */ | |
842 | if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) && | |
843 | ovs_ct_helper(skb, info->family) != NF_ACCEPT) { | |
844 | return -EINVAL; | |
845 | } | |
a94ebc39 JS |
846 | } |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
851 | /* Lookup connection and read fields into key. */ | |
852 | static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, | |
853 | const struct ovs_conntrack_info *info, | |
854 | struct sk_buff *skb) | |
855 | { | |
856 | struct nf_conntrack_expect *exp; | |
857 | ||
b0f251cd JR |
858 | /* If we pass an expected packet through nf_conntrack_in() the |
859 | * expectation is typically removed, but the packet could still be | |
860 | * lost in upcall processing. To prevent this from happening we | |
861 | * perform an explicit expectation lookup. Expected connections are | |
862 | * always new, and will be passed through conntrack only when they are | |
863 | * committed, as it is OK to remove the expectation at that time. | |
864 | */ | |
a94ebc39 JS |
865 | exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); |
866 | if (exp) { | |
867 | u8 state; | |
868 | ||
f8f97cdc JR |
869 | /* NOTE: New connections are NATted and Helped only when |
870 | * committed, so we are not calling into NAT here. | |
871 | */ | |
a94ebc39 | 872 | state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; |
372ce973 | 873 | __ovs_ct_update_key(key, state, &info->zone, exp->master); |
f325530e PS |
874 | } else { |
875 | struct nf_conn *ct; | |
876 | int err; | |
877 | ||
878 | err = __ovs_ct_lookup(net, key, info, skb); | |
879 | if (err) | |
880 | return err; | |
881 | ||
d3c313c1 | 882 | ct = (struct nf_conn *)skb_nfct(skb); |
f325530e PS |
883 | if (ct) |
884 | nf_ct_deliver_cached_events(ct); | |
885 | } | |
a94ebc39 JS |
886 | |
887 | return 0; | |
888 | } | |
889 | ||
c05e2094 | 890 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels) |
038e34ab JS |
891 | { |
892 | size_t i; | |
893 | ||
c05e2094 JS |
894 | for (i = 0; i < sizeof(*labels); i++) |
895 | if (labels->ct_labels[i]) | |
038e34ab JS |
896 | return true; |
897 | ||
898 | return false; | |
899 | } | |
900 | ||
39a6542b JR |
901 | /* Lookup connection and confirm if unconfirmed. */ |
902 | static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, | |
903 | const struct ovs_conntrack_info *info, | |
904 | struct sk_buff *skb) | |
905 | { | |
906 | int err; | |
907 | ||
908 | err = __ovs_ct_lookup(net, key, info, skb); | |
909 | if (err) | |
910 | return err; | |
911 | ||
912 | /* Apply changes before confirming the connection so that the initial | |
913 | * conntrack NEW netlink event carries the values given in the CT | |
914 | * action. | |
915 | */ | |
916 | if (info->mark.mask) { | |
917 | err = ovs_ct_set_mark(skb, key, info->mark.value, | |
918 | info->mark.mask); | |
919 | if (err) | |
920 | return err; | |
921 | } | |
922 | if (labels_nonzero(&info->labels.mask)) { | |
923 | err = ovs_ct_set_labels(skb, key, &info->labels.value, | |
924 | &info->labels.mask); | |
925 | if (err) | |
926 | return err; | |
927 | } | |
928 | /* This will take care of sending queued events even if the connection | |
929 | * is already confirmed. | |
930 | */ | |
931 | if (nf_conntrack_confirm(skb) != NF_ACCEPT) | |
932 | return -EINVAL; | |
933 | ||
934 | return 0; | |
935 | } | |
936 | ||
c05e2094 JS |
937 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
938 | * value if 'skb' is freed. | |
939 | */ | |
a94ebc39 JS |
940 | int ovs_ct_execute(struct net *net, struct sk_buff *skb, |
941 | struct sw_flow_key *key, | |
942 | const struct ovs_conntrack_info *info) | |
943 | { | |
944 | int nh_ofs; | |
945 | int err; | |
946 | ||
947 | /* The conntrack module expects to be working at L3. */ | |
948 | nh_ofs = skb_network_offset(skb); | |
073c7b86 | 949 | skb_pull_rcsum(skb, nh_ofs); |
a94ebc39 JS |
950 | |
951 | if (key->ip.frag != OVS_FRAG_TYPE_NONE) { | |
952 | err = handle_fragments(net, key, info->zone.id, skb); | |
953 | if (err) | |
954 | return err; | |
955 | } | |
956 | ||
c05e2094 | 957 | if (info->commit) |
39a6542b | 958 | err = ovs_ct_commit(net, key, info, skb); |
a94ebc39 JS |
959 | else |
960 | err = ovs_ct_lookup(net, key, info, skb); | |
961 | ||
962 | skb_push(skb, nh_ofs); | |
073c7b86 | 963 | skb_postpush_rcsum(skb, skb->data, nh_ofs); |
c05e2094 JS |
964 | if (err) |
965 | kfree_skb(skb); | |
a94ebc39 JS |
966 | return err; |
967 | } | |
968 | ||
11251c17 JS |
969 | static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, |
970 | const struct sw_flow_key *key, bool log) | |
971 | { | |
972 | struct nf_conntrack_helper *helper; | |
973 | struct nf_conn_help *help; | |
974 | ||
975 | helper = nf_conntrack_helper_try_module_get(name, info->family, | |
976 | key->ip.proto); | |
977 | if (!helper) { | |
978 | OVS_NLERR(log, "Unknown helper \"%s\"", name); | |
979 | return -EINVAL; | |
980 | } | |
981 | ||
982 | help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); | |
983 | if (!help) { | |
984 | module_put(helper->me); | |
985 | return -ENOMEM; | |
986 | } | |
987 | ||
988 | rcu_assign_pointer(help->helper, helper); | |
989 | info->helper = helper; | |
990 | return 0; | |
991 | } | |
992 | ||
f8f97cdc JR |
993 | #ifdef CONFIG_NF_NAT_NEEDED |
994 | static int parse_nat(const struct nlattr *attr, | |
995 | struct ovs_conntrack_info *info, bool log) | |
996 | { | |
997 | struct nlattr *a; | |
998 | int rem; | |
999 | bool have_ip_max = false; | |
1000 | bool have_proto_max = false; | |
1001 | bool ip_vers = (info->family == NFPROTO_IPV6); | |
1002 | ||
1003 | nla_for_each_nested(a, attr, rem) { | |
1004 | static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = { | |
1005 | [OVS_NAT_ATTR_SRC] = {0, 0}, | |
1006 | [OVS_NAT_ATTR_DST] = {0, 0}, | |
1007 | [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr), | |
1008 | sizeof(struct in6_addr)}, | |
1009 | [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr), | |
1010 | sizeof(struct in6_addr)}, | |
1011 | [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)}, | |
1012 | [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)}, | |
1013 | [OVS_NAT_ATTR_PERSISTENT] = {0, 0}, | |
1014 | [OVS_NAT_ATTR_PROTO_HASH] = {0, 0}, | |
1015 | [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0}, | |
1016 | }; | |
1017 | int type = nla_type(a); | |
1018 | ||
1019 | if (type > OVS_NAT_ATTR_MAX) { | |
1020 | OVS_NLERR(log, | |
1021 | "Unknown NAT attribute (type=%d, max=%d).\n", | |
1022 | type, OVS_NAT_ATTR_MAX); | |
1023 | return -EINVAL; | |
1024 | } | |
1025 | ||
1026 | if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) { | |
1027 | OVS_NLERR(log, | |
1028 | "NAT attribute type %d has unexpected length (%d != %d).\n", | |
1029 | type, nla_len(a), | |
1030 | ovs_nat_attr_lens[type][ip_vers]); | |
1031 | return -EINVAL; | |
1032 | } | |
1033 | ||
1034 | switch (type) { | |
1035 | case OVS_NAT_ATTR_SRC: | |
1036 | case OVS_NAT_ATTR_DST: | |
1037 | if (info->nat) { | |
1038 | OVS_NLERR(log, | |
1039 | "Only one type of NAT may be specified.\n" | |
1040 | ); | |
1041 | return -ERANGE; | |
1042 | } | |
1043 | info->nat |= OVS_CT_NAT; | |
1044 | info->nat |= ((type == OVS_NAT_ATTR_SRC) | |
1045 | ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT); | |
1046 | break; | |
1047 | ||
1048 | case OVS_NAT_ATTR_IP_MIN: | |
70e71d27 HY |
1049 | nla_memcpy(&info->range.min_addr, a, |
1050 | sizeof(info->range.min_addr)); | |
f8f97cdc JR |
1051 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; |
1052 | break; | |
1053 | ||
1054 | case OVS_NAT_ATTR_IP_MAX: | |
1055 | have_ip_max = true; | |
1056 | nla_memcpy(&info->range.max_addr, a, | |
1057 | sizeof(info->range.max_addr)); | |
1058 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; | |
1059 | break; | |
1060 | ||
1061 | case OVS_NAT_ATTR_PROTO_MIN: | |
1062 | info->range.min_proto.all = htons(nla_get_u16(a)); | |
1063 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; | |
1064 | break; | |
1065 | ||
1066 | case OVS_NAT_ATTR_PROTO_MAX: | |
1067 | have_proto_max = true; | |
1068 | info->range.max_proto.all = htons(nla_get_u16(a)); | |
1069 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; | |
1070 | break; | |
1071 | ||
1072 | case OVS_NAT_ATTR_PERSISTENT: | |
1073 | info->range.flags |= NF_NAT_RANGE_PERSISTENT; | |
1074 | break; | |
1075 | ||
1076 | case OVS_NAT_ATTR_PROTO_HASH: | |
1077 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM; | |
1078 | break; | |
1079 | ||
1080 | case OVS_NAT_ATTR_PROTO_RANDOM: | |
9f1de150 | 1081 | #ifdef NF_NAT_RANGE_PROTO_RANDOM_FULLY |
f8f97cdc | 1082 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; |
9f1de150 JR |
1083 | #else |
1084 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM; | |
1085 | info->random_fully_compat = true; | |
1086 | #endif | |
f8f97cdc JR |
1087 | break; |
1088 | ||
1089 | default: | |
1090 | OVS_NLERR(log, "Unknown nat attribute (%d).\n", type); | |
1091 | return -EINVAL; | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | if (rem > 0) { | |
1096 | OVS_NLERR(log, "NAT attribute has %d unknown bytes.\n", rem); | |
1097 | return -EINVAL; | |
1098 | } | |
1099 | if (!info->nat) { | |
1100 | /* Do not allow flags if no type is given. */ | |
1101 | if (info->range.flags) { | |
1102 | OVS_NLERR(log, | |
1103 | "NAT flags may be given only when NAT range (SRC or DST) is also specified.\n" | |
1104 | ); | |
1105 | return -EINVAL; | |
1106 | } | |
1107 | info->nat = OVS_CT_NAT; /* NAT existing connections. */ | |
1108 | } else if (!info->commit) { | |
1109 | OVS_NLERR(log, | |
1110 | "NAT attributes may be specified only when CT COMMIT flag is also specified.\n" | |
1111 | ); | |
1112 | return -EINVAL; | |
1113 | } | |
1114 | /* Allow missing IP_MAX. */ | |
1115 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) { | |
1116 | memcpy(&info->range.max_addr, &info->range.min_addr, | |
1117 | sizeof(info->range.max_addr)); | |
1118 | } | |
1119 | /* Allow missing PROTO_MAX. */ | |
1120 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && | |
1121 | !have_proto_max) { | |
1122 | info->range.max_proto.all = info->range.min_proto.all; | |
1123 | } | |
1124 | return 0; | |
1125 | } | |
1126 | #endif | |
1127 | ||
a94ebc39 | 1128 | static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { |
c05e2094 | 1129 | [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
a94ebc39 JS |
1130 | [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), |
1131 | .maxlen = sizeof(u16) }, | |
372ce973 JS |
1132 | [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), |
1133 | .maxlen = sizeof(struct md_mark) }, | |
c05e2094 JS |
1134 | [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), |
1135 | .maxlen = sizeof(struct md_labels) }, | |
11251c17 | 1136 | [OVS_CT_ATTR_HELPER] = { .minlen = 1, |
f8f97cdc JR |
1137 | .maxlen = NF_CT_HELPER_NAME_LEN }, |
1138 | #ifdef CONFIG_NF_NAT_NEEDED | |
1139 | /* NAT length is checked when parsing the nested attributes. */ | |
1140 | [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX }, | |
1141 | #endif | |
a94ebc39 JS |
1142 | }; |
1143 | ||
1144 | static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, | |
11251c17 | 1145 | const char **helper, bool log) |
a94ebc39 JS |
1146 | { |
1147 | struct nlattr *a; | |
1148 | int rem; | |
1149 | ||
1150 | nla_for_each_nested(a, attr, rem) { | |
1151 | int type = nla_type(a); | |
1152 | int maxlen = ovs_ct_attr_lens[type].maxlen; | |
1153 | int minlen = ovs_ct_attr_lens[type].minlen; | |
1154 | ||
1155 | if (type > OVS_CT_ATTR_MAX) { | |
1156 | OVS_NLERR(log, | |
1157 | "Unknown conntrack attr (type=%d, max=%d)", | |
1158 | type, OVS_CT_ATTR_MAX); | |
1159 | return -EINVAL; | |
1160 | } | |
1161 | if (nla_len(a) < minlen || nla_len(a) > maxlen) { | |
1162 | OVS_NLERR(log, | |
1163 | "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", | |
1164 | type, nla_len(a), maxlen); | |
1165 | return -EINVAL; | |
1166 | } | |
1167 | ||
1168 | switch (type) { | |
c05e2094 JS |
1169 | case OVS_CT_ATTR_COMMIT: |
1170 | info->commit = true; | |
a94ebc39 JS |
1171 | break; |
1172 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
1173 | case OVS_CT_ATTR_ZONE: | |
1174 | info->zone.id = nla_get_u16(a); | |
1175 | break; | |
372ce973 JS |
1176 | #endif |
1177 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
1178 | case OVS_CT_ATTR_MARK: { | |
1179 | struct md_mark *mark = nla_data(a); | |
1180 | ||
c05e2094 JS |
1181 | if (!mark->mask) { |
1182 | OVS_NLERR(log, "ct_mark mask cannot be 0"); | |
1183 | return -EINVAL; | |
1184 | } | |
372ce973 JS |
1185 | info->mark = *mark; |
1186 | break; | |
1187 | } | |
038e34ab JS |
1188 | #endif |
1189 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
c05e2094 JS |
1190 | case OVS_CT_ATTR_LABELS: { |
1191 | struct md_labels *labels = nla_data(a); | |
038e34ab | 1192 | |
c05e2094 JS |
1193 | if (!labels_nonzero(&labels->mask)) { |
1194 | OVS_NLERR(log, "ct_labels mask cannot be 0"); | |
1195 | return -EINVAL; | |
1196 | } | |
1197 | info->labels = *labels; | |
038e34ab JS |
1198 | break; |
1199 | } | |
a94ebc39 | 1200 | #endif |
11251c17 JS |
1201 | case OVS_CT_ATTR_HELPER: |
1202 | *helper = nla_data(a); | |
1203 | if (!memchr(*helper, '\0', nla_len(a))) { | |
1204 | OVS_NLERR(log, "Invalid conntrack helper"); | |
1205 | return -EINVAL; | |
1206 | } | |
1207 | break; | |
f8f97cdc JR |
1208 | #ifdef CONFIG_NF_NAT_NEEDED |
1209 | case OVS_CT_ATTR_NAT: { | |
1210 | int err = parse_nat(a, info, log); | |
1211 | ||
1212 | if (err) | |
1213 | return err; | |
1214 | break; | |
1215 | } | |
1216 | #endif | |
a94ebc39 JS |
1217 | default: |
1218 | OVS_NLERR(log, "Unknown conntrack attr (%d)", | |
1219 | type); | |
1220 | return -EINVAL; | |
1221 | } | |
1222 | } | |
1223 | ||
39a6542b JR |
1224 | #ifdef CONFIG_NF_CONNTRACK_MARK |
1225 | if (!info->commit && info->mark.mask) { | |
1226 | OVS_NLERR(log, | |
1227 | "Setting conntrack mark requires 'commit' flag."); | |
1228 | return -EINVAL; | |
1229 | } | |
1230 | #endif | |
1231 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
1232 | if (!info->commit && labels_nonzero(&info->labels.mask)) { | |
1233 | OVS_NLERR(log, | |
1234 | "Setting conntrack labels requires 'commit' flag."); | |
1235 | return -EINVAL; | |
1236 | } | |
1237 | #endif | |
a94ebc39 JS |
1238 | if (rem > 0) { |
1239 | OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); | |
1240 | return -EINVAL; | |
1241 | } | |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
038e34ab | 1246 | bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) |
a94ebc39 JS |
1247 | { |
1248 | if (attr == OVS_KEY_ATTR_CT_STATE) | |
1249 | return true; | |
1250 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
1251 | attr == OVS_KEY_ATTR_CT_ZONE) | |
1252 | return true; | |
372ce973 JS |
1253 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
1254 | attr == OVS_KEY_ATTR_CT_MARK) | |
1255 | return true; | |
038e34ab | 1256 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
c05e2094 | 1257 | attr == OVS_KEY_ATTR_CT_LABELS) { |
038e34ab JS |
1258 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
1259 | ||
1260 | return ovs_net->xt_label; | |
1261 | } | |
a94ebc39 JS |
1262 | |
1263 | return false; | |
1264 | } | |
1265 | ||
1266 | int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, | |
1267 | const struct sw_flow_key *key, | |
1268 | struct sw_flow_actions **sfa, bool log) | |
1269 | { | |
1270 | struct ovs_conntrack_info ct_info; | |
11251c17 | 1271 | const char *helper = NULL; |
a94ebc39 JS |
1272 | u16 family; |
1273 | int err; | |
1274 | ||
1275 | family = key_to_nfproto(key); | |
1276 | if (family == NFPROTO_UNSPEC) { | |
1277 | OVS_NLERR(log, "ct family unspecified"); | |
1278 | return -EINVAL; | |
1279 | } | |
1280 | ||
1281 | memset(&ct_info, 0, sizeof(ct_info)); | |
1282 | ct_info.family = family; | |
1283 | ||
1284 | nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, | |
1285 | NF_CT_DEFAULT_ZONE_DIR, 0); | |
1286 | ||
11251c17 | 1287 | err = parse_ct(attr, &ct_info, &helper, log); |
a94ebc39 JS |
1288 | if (err) |
1289 | return err; | |
1290 | ||
1291 | /* Set up template for tracking connections in specific zones. */ | |
1292 | ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); | |
1293 | if (!ct_info.ct) { | |
1294 | OVS_NLERR(log, "Failed to allocate conntrack template"); | |
1295 | return -ENOMEM; | |
1296 | } | |
a3a68d63 JS |
1297 | |
1298 | __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); | |
1299 | nf_conntrack_get(&ct_info.ct->ct_general); | |
1300 | ||
11251c17 JS |
1301 | if (helper) { |
1302 | err = ovs_ct_add_helper(&ct_info, helper, key, log); | |
1303 | if (err) | |
1304 | goto err_free_ct; | |
1305 | } | |
a94ebc39 JS |
1306 | |
1307 | err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, | |
1308 | sizeof(ct_info), log); | |
1309 | if (err) | |
1310 | goto err_free_ct; | |
1311 | ||
a94ebc39 JS |
1312 | return 0; |
1313 | err_free_ct: | |
11251c17 | 1314 | __ovs_ct_free_action(&ct_info); |
a94ebc39 JS |
1315 | return err; |
1316 | } | |
1317 | ||
f8f97cdc JR |
1318 | #ifdef CONFIG_NF_NAT_NEEDED |
1319 | static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info, | |
1320 | struct sk_buff *skb) | |
1321 | { | |
1322 | struct nlattr *start; | |
1323 | ||
1324 | start = nla_nest_start(skb, OVS_CT_ATTR_NAT); | |
1325 | if (!start) | |
1326 | return false; | |
1327 | ||
1328 | if (info->nat & OVS_CT_SRC_NAT) { | |
1329 | if (nla_put_flag(skb, OVS_NAT_ATTR_SRC)) | |
1330 | return false; | |
1331 | } else if (info->nat & OVS_CT_DST_NAT) { | |
1332 | if (nla_put_flag(skb, OVS_NAT_ATTR_DST)) | |
1333 | return false; | |
1334 | } else { | |
1335 | goto out; | |
1336 | } | |
1337 | ||
1338 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS) { | |
90b01477 AB |
1339 | if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && |
1340 | info->family == NFPROTO_IPV4) { | |
f8f97cdc JR |
1341 | if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN, |
1342 | info->range.min_addr.ip) || | |
1343 | (info->range.max_addr.ip | |
1344 | != info->range.min_addr.ip && | |
1345 | (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX, | |
1346 | info->range.max_addr.ip)))) | |
1347 | return false; | |
90b01477 AB |
1348 | } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && |
1349 | info->family == NFPROTO_IPV6) { | |
f8f97cdc JR |
1350 | if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN, |
1351 | &info->range.min_addr.in6) || | |
1352 | (memcmp(&info->range.max_addr.in6, | |
1353 | &info->range.min_addr.in6, | |
1354 | sizeof(info->range.max_addr.in6)) && | |
1355 | (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX, | |
1356 | &info->range.max_addr.in6)))) | |
1357 | return false; | |
f8f97cdc JR |
1358 | } else { |
1359 | return false; | |
1360 | } | |
1361 | } | |
1362 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && | |
1363 | (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN, | |
1364 | ntohs(info->range.min_proto.all)) || | |
1365 | (info->range.max_proto.all != info->range.min_proto.all && | |
1366 | nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX, | |
1367 | ntohs(info->range.max_proto.all))))) | |
1368 | return false; | |
1369 | ||
1370 | if (info->range.flags & NF_NAT_RANGE_PERSISTENT && | |
1371 | nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT)) | |
1372 | return false; | |
1373 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM && | |
9f1de150 JR |
1374 | nla_put_flag(skb, info->random_fully_compat |
1375 | ? OVS_NAT_ATTR_PROTO_RANDOM | |
1376 | : OVS_NAT_ATTR_PROTO_HASH)) | |
f8f97cdc | 1377 | return false; |
9f1de150 | 1378 | #ifdef NF_NAT_RANGE_PROTO_RANDOM_FULLY |
f8f97cdc JR |
1379 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY && |
1380 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM)) | |
1381 | return false; | |
9f1de150 | 1382 | #endif |
f8f97cdc JR |
1383 | out: |
1384 | nla_nest_end(skb, start); | |
1385 | ||
1386 | return true; | |
1387 | } | |
1388 | #endif | |
1389 | ||
a94ebc39 JS |
1390 | int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, |
1391 | struct sk_buff *skb) | |
1392 | { | |
1393 | struct nlattr *start; | |
1394 | ||
1395 | start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); | |
1396 | if (!start) | |
1397 | return -EMSGSIZE; | |
1398 | ||
c05e2094 | 1399 | if (ct_info->commit && nla_put_flag(skb, OVS_CT_ATTR_COMMIT)) |
a94ebc39 JS |
1400 | return -EMSGSIZE; |
1401 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
1402 | nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) | |
1403 | return -EMSGSIZE; | |
c05e2094 | 1404 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && |
372ce973 JS |
1405 | nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), |
1406 | &ct_info->mark)) | |
1407 | return -EMSGSIZE; | |
038e34ab | 1408 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
c05e2094 JS |
1409 | labels_nonzero(&ct_info->labels.mask) && |
1410 | nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), | |
1411 | &ct_info->labels)) | |
038e34ab | 1412 | return -EMSGSIZE; |
11251c17 JS |
1413 | if (ct_info->helper) { |
1414 | if (nla_put_string(skb, OVS_CT_ATTR_HELPER, | |
1415 | ct_info->helper->name)) | |
1416 | return -EMSGSIZE; | |
1417 | } | |
f8f97cdc JR |
1418 | #ifdef CONFIG_NF_NAT_NEEDED |
1419 | if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb)) | |
1420 | return -EMSGSIZE; | |
1421 | #endif | |
a94ebc39 JS |
1422 | nla_nest_end(skb, start); |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | void ovs_ct_free_action(const struct nlattr *a) | |
1428 | { | |
1429 | struct ovs_conntrack_info *ct_info = nla_data(a); | |
1430 | ||
11251c17 JS |
1431 | __ovs_ct_free_action(ct_info); |
1432 | } | |
1433 | ||
1434 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info) | |
1435 | { | |
1436 | if (ct_info->helper) | |
1437 | module_put(ct_info->helper->me); | |
a94ebc39 JS |
1438 | if (ct_info->ct) |
1439 | nf_ct_tmpl_free(ct_info->ct); | |
1440 | } | |
1441 | ||
038e34ab JS |
1442 | void ovs_ct_init(struct net *net) |
1443 | { | |
c05e2094 | 1444 | unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; |
038e34ab JS |
1445 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
1446 | ||
7f2ab8cd | 1447 | if (nf_connlabels_get(net, n_bits - 1)) { |
038e34ab JS |
1448 | ovs_net->xt_label = false; |
1449 | OVS_NLERR(true, "Failed to set connlabel length"); | |
1450 | } else { | |
1451 | ovs_net->xt_label = true; | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | void ovs_ct_exit(struct net *net) | |
1456 | { | |
1457 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
1458 | ||
1459 | if (ovs_net->xt_label) | |
1460 | nf_connlabels_put(net); | |
1461 | } | |
1462 | ||
8063e095 | 1463 | #endif /* CONFIG_NF_CONNTRACK */ |