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Commit | Line | Data |
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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> | |
05752523 JR |
16 | #include <linux/tcp.h> |
17 | #include <linux/udp.h> | |
18 | #include <linux/sctp.h> | |
7f8a436e JS |
19 | #include <net/ip.h> |
20 | #include <net/netfilter/nf_conntrack_core.h> | |
cae3a262 | 21 | #include <net/netfilter/nf_conntrack_helper.h> |
c2ac6673 | 22 | #include <net/netfilter/nf_conntrack_labels.h> |
05752523 | 23 | #include <net/netfilter/nf_conntrack_seqadj.h> |
7f8a436e JS |
24 | #include <net/netfilter/nf_conntrack_zones.h> |
25 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> | |
26 | ||
05752523 JR |
27 | #ifdef CONFIG_NF_NAT_NEEDED |
28 | #include <linux/netfilter/nf_nat.h> | |
29 | #include <net/netfilter/nf_nat_core.h> | |
30 | #include <net/netfilter/nf_nat_l3proto.h> | |
31 | #endif | |
32 | ||
7f8a436e JS |
33 | #include "datapath.h" |
34 | #include "conntrack.h" | |
35 | #include "flow.h" | |
36 | #include "flow_netlink.h" | |
37 | ||
38 | struct ovs_ct_len_tbl { | |
05752523 JR |
39 | int maxlen; |
40 | int minlen; | |
7f8a436e JS |
41 | }; |
42 | ||
182e3042 JS |
43 | /* Metadata mark for masked write to conntrack mark */ |
44 | struct md_mark { | |
45 | u32 value; | |
46 | u32 mask; | |
47 | }; | |
48 | ||
c2ac6673 | 49 | /* Metadata label for masked write to conntrack label. */ |
33db4125 JS |
50 | struct md_labels { |
51 | struct ovs_key_ct_labels value; | |
52 | struct ovs_key_ct_labels mask; | |
c2ac6673 JS |
53 | }; |
54 | ||
05752523 JR |
55 | enum ovs_ct_nat { |
56 | OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ | |
57 | OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ | |
58 | OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */ | |
59 | }; | |
60 | ||
7f8a436e JS |
61 | /* Conntrack action context for execution. */ |
62 | struct ovs_conntrack_info { | |
cae3a262 | 63 | struct nf_conntrack_helper *helper; |
7f8a436e JS |
64 | struct nf_conntrack_zone zone; |
65 | struct nf_conn *ct; | |
ab38a7b5 | 66 | u8 commit : 1; |
05752523 | 67 | u8 nat : 3; /* enum ovs_ct_nat */ |
dd41d33f | 68 | u8 force : 1; |
12064551 | 69 | u8 have_eventmask : 1; |
7f8a436e | 70 | u16 family; |
12064551 | 71 | u32 eventmask; /* Mask of 1 << IPCT_*. */ |
182e3042 | 72 | struct md_mark mark; |
33db4125 | 73 | struct md_labels labels; |
05752523 JR |
74 | #ifdef CONFIG_NF_NAT_NEEDED |
75 | struct nf_nat_range range; /* Only present for SRC NAT and DST NAT. */ | |
76 | #endif | |
7f8a436e JS |
77 | }; |
78 | ||
09aa98ad JR |
79 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels); |
80 | ||
2f3ab9f9 JS |
81 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); |
82 | ||
7f8a436e JS |
83 | static u16 key_to_nfproto(const struct sw_flow_key *key) |
84 | { | |
85 | switch (ntohs(key->eth.type)) { | |
86 | case ETH_P_IP: | |
87 | return NFPROTO_IPV4; | |
88 | case ETH_P_IPV6: | |
89 | return NFPROTO_IPV6; | |
90 | default: | |
91 | return NFPROTO_UNSPEC; | |
92 | } | |
93 | } | |
94 | ||
95 | /* Map SKB connection state into the values used by flow definition. */ | |
96 | static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) | |
97 | { | |
98 | u8 ct_state = OVS_CS_F_TRACKED; | |
99 | ||
100 | switch (ctinfo) { | |
101 | case IP_CT_ESTABLISHED_REPLY: | |
102 | case IP_CT_RELATED_REPLY: | |
7f8a436e JS |
103 | ct_state |= OVS_CS_F_REPLY_DIR; |
104 | break; | |
105 | default: | |
106 | break; | |
107 | } | |
108 | ||
109 | switch (ctinfo) { | |
110 | case IP_CT_ESTABLISHED: | |
111 | case IP_CT_ESTABLISHED_REPLY: | |
112 | ct_state |= OVS_CS_F_ESTABLISHED; | |
113 | break; | |
114 | case IP_CT_RELATED: | |
115 | case IP_CT_RELATED_REPLY: | |
116 | ct_state |= OVS_CS_F_RELATED; | |
117 | break; | |
118 | case IP_CT_NEW: | |
7f8a436e JS |
119 | ct_state |= OVS_CS_F_NEW; |
120 | break; | |
121 | default: | |
122 | break; | |
123 | } | |
124 | ||
125 | return ct_state; | |
126 | } | |
127 | ||
0d5cdef8 JS |
128 | static u32 ovs_ct_get_mark(const struct nf_conn *ct) |
129 | { | |
130 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) | |
131 | return ct ? ct->mark : 0; | |
132 | #else | |
133 | return 0; | |
134 | #endif | |
135 | } | |
136 | ||
b87cec38 JR |
137 | /* Guard against conntrack labels max size shrinking below 128 bits. */ |
138 | #if NF_CT_LABELS_MAX_SIZE < 16 | |
139 | #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes | |
140 | #endif | |
141 | ||
33db4125 JS |
142 | static void ovs_ct_get_labels(const struct nf_conn *ct, |
143 | struct ovs_key_ct_labels *labels) | |
c2ac6673 JS |
144 | { |
145 | struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; | |
146 | ||
b87cec38 JR |
147 | if (cl) |
148 | memcpy(labels, cl->bits, OVS_CT_LABELS_LEN); | |
149 | else | |
33db4125 | 150 | memset(labels, 0, OVS_CT_LABELS_LEN); |
c2ac6673 JS |
151 | } |
152 | ||
9dd7f890 JR |
153 | static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key, |
154 | const struct nf_conntrack_tuple *orig, | |
155 | u8 icmp_proto) | |
156 | { | |
316d4d78 | 157 | key->ct_orig_proto = orig->dst.protonum; |
9dd7f890 JR |
158 | if (orig->dst.protonum == icmp_proto) { |
159 | key->ct.orig_tp.src = htons(orig->dst.u.icmp.type); | |
160 | key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code); | |
161 | } else { | |
162 | key->ct.orig_tp.src = orig->src.u.all; | |
163 | key->ct.orig_tp.dst = orig->dst.u.all; | |
164 | } | |
165 | } | |
166 | ||
7f8a436e | 167 | static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, |
182e3042 JS |
168 | const struct nf_conntrack_zone *zone, |
169 | const struct nf_conn *ct) | |
7f8a436e | 170 | { |
316d4d78 JR |
171 | key->ct_state = state; |
172 | key->ct_zone = zone->id; | |
0d5cdef8 | 173 | key->ct.mark = ovs_ct_get_mark(ct); |
33db4125 | 174 | ovs_ct_get_labels(ct, &key->ct.labels); |
9dd7f890 JR |
175 | |
176 | if (ct) { | |
177 | const struct nf_conntrack_tuple *orig; | |
178 | ||
179 | /* Use the master if we have one. */ | |
180 | if (ct->master) | |
181 | ct = ct->master; | |
182 | orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; | |
183 | ||
184 | /* IP version must match with the master connection. */ | |
185 | if (key->eth.type == htons(ETH_P_IP) && | |
186 | nf_ct_l3num(ct) == NFPROTO_IPV4) { | |
187 | key->ipv4.ct_orig.src = orig->src.u3.ip; | |
188 | key->ipv4.ct_orig.dst = orig->dst.u3.ip; | |
189 | __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP); | |
190 | return; | |
191 | } else if (key->eth.type == htons(ETH_P_IPV6) && | |
192 | !sw_flow_key_is_nd(key) && | |
193 | nf_ct_l3num(ct) == NFPROTO_IPV6) { | |
194 | key->ipv6.ct_orig.src = orig->src.u3.in6; | |
195 | key->ipv6.ct_orig.dst = orig->dst.u3.in6; | |
196 | __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP); | |
197 | return; | |
198 | } | |
199 | } | |
316d4d78 | 200 | /* Clear 'ct_orig_proto' to mark the non-existence of conntrack |
9dd7f890 JR |
201 | * original direction key fields. |
202 | */ | |
316d4d78 | 203 | key->ct_orig_proto = 0; |
7f8a436e JS |
204 | } |
205 | ||
5e17da63 | 206 | /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has |
05752523 JR |
207 | * previously sent the packet to conntrack via the ct action. If |
208 | * 'keep_nat_flags' is true, the existing NAT flags retained, else they are | |
209 | * initialized from the connection status. | |
7f8a436e JS |
210 | */ |
211 | static void ovs_ct_update_key(const struct sk_buff *skb, | |
d110986c | 212 | const struct ovs_conntrack_info *info, |
05752523 JR |
213 | struct sw_flow_key *key, bool post_ct, |
214 | bool keep_nat_flags) | |
7f8a436e JS |
215 | { |
216 | const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; | |
217 | enum ip_conntrack_info ctinfo; | |
218 | struct nf_conn *ct; | |
219 | u8 state = 0; | |
220 | ||
221 | ct = nf_ct_get(skb, &ctinfo); | |
222 | if (ct) { | |
223 | state = ovs_ct_get_state(ctinfo); | |
9f13ded8 | 224 | /* All unconfirmed entries are NEW connections. */ |
4f0909ee JS |
225 | if (!nf_ct_is_confirmed(ct)) |
226 | state |= OVS_CS_F_NEW; | |
9f13ded8 JR |
227 | /* OVS persists the related flag for the duration of the |
228 | * connection. | |
229 | */ | |
7f8a436e JS |
230 | if (ct->master) |
231 | state |= OVS_CS_F_RELATED; | |
05752523 | 232 | if (keep_nat_flags) { |
316d4d78 | 233 | state |= key->ct_state & OVS_CS_F_NAT_MASK; |
05752523 JR |
234 | } else { |
235 | if (ct->status & IPS_SRC_NAT) | |
236 | state |= OVS_CS_F_SRC_NAT; | |
237 | if (ct->status & IPS_DST_NAT) | |
238 | state |= OVS_CS_F_DST_NAT; | |
239 | } | |
7f8a436e JS |
240 | zone = nf_ct_zone(ct); |
241 | } else if (post_ct) { | |
242 | state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; | |
d110986c JS |
243 | if (info) |
244 | zone = &info->zone; | |
7f8a436e | 245 | } |
182e3042 | 246 | __ovs_ct_update_key(key, state, zone, ct); |
7f8a436e JS |
247 | } |
248 | ||
9f13ded8 JR |
249 | /* This is called to initialize CT key fields possibly coming in from the local |
250 | * stack. | |
251 | */ | |
7f8a436e JS |
252 | void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) |
253 | { | |
05752523 | 254 | ovs_ct_update_key(skb, NULL, key, false, false); |
7f8a436e JS |
255 | } |
256 | ||
9dd7f890 JR |
257 | #define IN6_ADDR_INITIALIZER(ADDR) \ |
258 | { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \ | |
259 | (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] } | |
260 | ||
261 | int ovs_ct_put_key(const struct sw_flow_key *swkey, | |
262 | const struct sw_flow_key *output, struct sk_buff *skb) | |
7f8a436e | 263 | { |
316d4d78 | 264 | if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state)) |
7f8a436e JS |
265 | return -EMSGSIZE; |
266 | ||
267 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
316d4d78 | 268 | nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone)) |
7f8a436e JS |
269 | return -EMSGSIZE; |
270 | ||
182e3042 | 271 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
9dd7f890 | 272 | nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark)) |
182e3042 JS |
273 | return -EMSGSIZE; |
274 | ||
9723e6ab | 275 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
9dd7f890 JR |
276 | nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels), |
277 | &output->ct.labels)) | |
c2ac6673 JS |
278 | return -EMSGSIZE; |
279 | ||
316d4d78 | 280 | if (swkey->ct_orig_proto) { |
9dd7f890 JR |
281 | if (swkey->eth.type == htons(ETH_P_IP)) { |
282 | struct ovs_key_ct_tuple_ipv4 orig = { | |
283 | output->ipv4.ct_orig.src, | |
284 | output->ipv4.ct_orig.dst, | |
285 | output->ct.orig_tp.src, | |
286 | output->ct.orig_tp.dst, | |
316d4d78 | 287 | output->ct_orig_proto, |
9dd7f890 JR |
288 | }; |
289 | if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, | |
290 | sizeof(orig), &orig)) | |
291 | return -EMSGSIZE; | |
292 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
293 | struct ovs_key_ct_tuple_ipv6 orig = { | |
294 | IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src), | |
295 | IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst), | |
296 | output->ct.orig_tp.src, | |
297 | output->ct.orig_tp.dst, | |
316d4d78 | 298 | output->ct_orig_proto, |
9dd7f890 JR |
299 | }; |
300 | if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, | |
301 | sizeof(orig), &orig)) | |
302 | return -EMSGSIZE; | |
303 | } | |
304 | } | |
305 | ||
182e3042 JS |
306 | return 0; |
307 | } | |
308 | ||
6ffcea79 | 309 | static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key, |
182e3042 JS |
310 | u32 ct_mark, u32 mask) |
311 | { | |
0d5cdef8 | 312 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
182e3042 JS |
313 | u32 new_mark; |
314 | ||
182e3042 JS |
315 | new_mark = ct_mark | (ct->mark & ~(mask)); |
316 | if (ct->mark != new_mark) { | |
317 | ct->mark = new_mark; | |
193e3096 JR |
318 | if (nf_ct_is_confirmed(ct)) |
319 | nf_conntrack_event_cache(IPCT_MARK, ct); | |
182e3042 JS |
320 | key->ct.mark = new_mark; |
321 | } | |
322 | ||
7f8a436e | 323 | return 0; |
0d5cdef8 JS |
324 | #else |
325 | return -ENOTSUPP; | |
326 | #endif | |
7f8a436e JS |
327 | } |
328 | ||
6ffcea79 | 329 | static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct) |
c2ac6673 | 330 | { |
c2ac6673 | 331 | struct nf_conn_labels *cl; |
c2ac6673 JS |
332 | |
333 | cl = nf_ct_labels_find(ct); | |
334 | if (!cl) { | |
335 | nf_ct_labels_ext_add(ct); | |
336 | cl = nf_ct_labels_find(ct); | |
337 | } | |
6ffcea79 JR |
338 | |
339 | return cl; | |
340 | } | |
341 | ||
342 | /* Initialize labels for a new, yet to be committed conntrack entry. Note that | |
343 | * since the new connection is not yet confirmed, and thus no-one else has | |
2317c6b5 | 344 | * access to it's labels, we simply write them over. |
6ffcea79 JR |
345 | */ |
346 | static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key, | |
347 | const struct ovs_key_ct_labels *labels, | |
348 | const struct ovs_key_ct_labels *mask) | |
349 | { | |
09aa98ad JR |
350 | struct nf_conn_labels *cl, *master_cl; |
351 | bool have_mask = labels_nonzero(mask); | |
352 | ||
353 | /* Inherit master's labels to the related connection? */ | |
354 | master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL; | |
355 | ||
356 | if (!master_cl && !have_mask) | |
357 | return 0; /* Nothing to do. */ | |
6ffcea79 JR |
358 | |
359 | cl = ovs_ct_get_conn_labels(ct); | |
b87cec38 | 360 | if (!cl) |
c2ac6673 JS |
361 | return -ENOSPC; |
362 | ||
09aa98ad JR |
363 | /* Inherit the master's labels, if any. */ |
364 | if (master_cl) | |
365 | *cl = *master_cl; | |
366 | ||
367 | if (have_mask) { | |
368 | u32 *dst = (u32 *)cl->bits; | |
369 | int i; | |
370 | ||
371 | for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) | |
372 | dst[i] = (dst[i] & ~mask->ct_labels_32[i]) | | |
373 | (labels->ct_labels_32[i] | |
374 | & mask->ct_labels_32[i]); | |
375 | } | |
193e3096 | 376 | |
2317c6b5 | 377 | /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the |
abd0a4f2 | 378 | * IPCT_LABEL bit is set in the event cache. |
2317c6b5 JR |
379 | */ |
380 | nf_conntrack_event_cache(IPCT_LABEL, ct); | |
381 | ||
6ffcea79 JR |
382 | memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key, | |
388 | const struct ovs_key_ct_labels *labels, | |
389 | const struct ovs_key_ct_labels *mask) | |
390 | { | |
391 | struct nf_conn_labels *cl; | |
392 | int err; | |
393 | ||
394 | cl = ovs_ct_get_conn_labels(ct); | |
395 | if (!cl) | |
396 | return -ENOSPC; | |
397 | ||
398 | err = nf_connlabels_replace(ct, labels->ct_labels_32, | |
399 | mask->ct_labels_32, | |
400 | OVS_CT_LABELS_LEN_32); | |
401 | if (err) | |
402 | return err; | |
403 | ||
404 | memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); | |
c2ac6673 | 405 | |
c2ac6673 JS |
406 | return 0; |
407 | } | |
408 | ||
cae3a262 JS |
409 | /* 'skb' should already be pulled to nh_ofs. */ |
410 | static int ovs_ct_helper(struct sk_buff *skb, u16 proto) | |
411 | { | |
412 | const struct nf_conntrack_helper *helper; | |
413 | const struct nf_conn_help *help; | |
414 | enum ip_conntrack_info ctinfo; | |
415 | unsigned int protoff; | |
416 | struct nf_conn *ct; | |
05752523 | 417 | int err; |
cae3a262 JS |
418 | |
419 | ct = nf_ct_get(skb, &ctinfo); | |
420 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) | |
421 | return NF_ACCEPT; | |
422 | ||
423 | help = nfct_help(ct); | |
424 | if (!help) | |
425 | return NF_ACCEPT; | |
426 | ||
427 | helper = rcu_dereference(help->helper); | |
428 | if (!helper) | |
429 | return NF_ACCEPT; | |
430 | ||
431 | switch (proto) { | |
432 | case NFPROTO_IPV4: | |
433 | protoff = ip_hdrlen(skb); | |
434 | break; | |
435 | case NFPROTO_IPV6: { | |
436 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; | |
437 | __be16 frag_off; | |
cc570605 | 438 | int ofs; |
cae3a262 | 439 | |
cc570605 JS |
440 | ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, |
441 | &frag_off); | |
442 | if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { | |
cae3a262 JS |
443 | pr_debug("proto header not found\n"); |
444 | return NF_ACCEPT; | |
445 | } | |
cc570605 | 446 | protoff = ofs; |
cae3a262 JS |
447 | break; |
448 | } | |
449 | default: | |
450 | WARN_ONCE(1, "helper invoked on non-IP family!"); | |
451 | return NF_DROP; | |
452 | } | |
453 | ||
05752523 JR |
454 | err = helper->help(skb, protoff, ct, ctinfo); |
455 | if (err != NF_ACCEPT) | |
456 | return err; | |
457 | ||
458 | /* Adjust seqs after helper. This is needed due to some helpers (e.g., | |
459 | * FTP with NAT) adusting the TCP payload size when mangling IP | |
460 | * addresses and/or port numbers in the text-based control connection. | |
461 | */ | |
462 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && | |
463 | !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) | |
464 | return NF_DROP; | |
465 | return NF_ACCEPT; | |
cae3a262 JS |
466 | } |
467 | ||
74c16618 JS |
468 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
469 | * value if 'skb' is freed. | |
470 | */ | |
7f8a436e JS |
471 | static int handle_fragments(struct net *net, struct sw_flow_key *key, |
472 | u16 zone, struct sk_buff *skb) | |
473 | { | |
474 | struct ovs_skb_cb ovs_cb = *OVS_CB(skb); | |
daaa7d64 | 475 | int err; |
7f8a436e JS |
476 | |
477 | if (key->eth.type == htons(ETH_P_IP)) { | |
478 | enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; | |
7f8a436e JS |
479 | |
480 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
19bcf9f2 | 481 | err = ip_defrag(net, skb, user); |
7f8a436e JS |
482 | if (err) |
483 | return err; | |
484 | ||
485 | ovs_cb.mru = IPCB(skb)->frag_max_size; | |
7f8a436e | 486 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
74c16618 | 487 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
7f8a436e | 488 | enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; |
7f8a436e JS |
489 | |
490 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); | |
daaa7d64 | 491 | err = nf_ct_frag6_gather(net, skb, user); |
f92a80a9 DDP |
492 | if (err) { |
493 | if (err != -EINPROGRESS) | |
494 | kfree_skb(skb); | |
daaa7d64 | 495 | return err; |
f92a80a9 | 496 | } |
7f8a436e | 497 | |
daaa7d64 | 498 | key->ip.proto = ipv6_hdr(skb)->nexthdr; |
7f8a436e | 499 | ovs_cb.mru = IP6CB(skb)->frag_max_size; |
7f8a436e JS |
500 | #endif |
501 | } else { | |
74c16618 | 502 | kfree_skb(skb); |
7f8a436e JS |
503 | return -EPFNOSUPPORT; |
504 | } | |
505 | ||
506 | key->ip.frag = OVS_FRAG_TYPE_NONE; | |
507 | skb_clear_hash(skb); | |
508 | skb->ignore_df = 1; | |
509 | *OVS_CB(skb) = ovs_cb; | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | static struct nf_conntrack_expect * | |
515 | ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, | |
516 | u16 proto, const struct sk_buff *skb) | |
517 | { | |
518 | struct nf_conntrack_tuple tuple; | |
cf5d7091 | 519 | struct nf_conntrack_expect *exp; |
7f8a436e | 520 | |
a31f1adc | 521 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple)) |
7f8a436e | 522 | return NULL; |
cf5d7091 JR |
523 | |
524 | exp = __nf_ct_expect_find(net, zone, &tuple); | |
525 | if (exp) { | |
526 | struct nf_conntrack_tuple_hash *h; | |
527 | ||
528 | /* Delete existing conntrack entry, if it clashes with the | |
529 | * expectation. This can happen since conntrack ALGs do not | |
530 | * check for clashes between (new) expectations and existing | |
531 | * conntrack entries. nf_conntrack_in() will check the | |
532 | * expectations only if a conntrack entry can not be found, | |
533 | * which can lead to OVS finding the expectation (here) in the | |
534 | * init direction, but which will not be removed by the | |
535 | * nf_conntrack_in() call, if a matching conntrack entry is | |
536 | * found instead. In this case all init direction packets | |
537 | * would be reported as new related packets, while reply | |
538 | * direction packets would be reported as un-related | |
539 | * established packets. | |
540 | */ | |
541 | h = nf_conntrack_find_get(net, zone, &tuple); | |
542 | if (h) { | |
543 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
544 | ||
545 | nf_ct_delete(ct, 0, 0); | |
546 | nf_conntrack_put(&ct->ct_general); | |
547 | } | |
548 | } | |
549 | ||
550 | return exp; | |
7f8a436e JS |
551 | } |
552 | ||
289f2253 JR |
553 | /* This replicates logic from nf_conntrack_core.c that is not exported. */ |
554 | static enum ip_conntrack_info | |
555 | ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h) | |
556 | { | |
557 | const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
558 | ||
559 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) | |
560 | return IP_CT_ESTABLISHED_REPLY; | |
561 | /* Once we've had two way comms, always ESTABLISHED. */ | |
562 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
563 | return IP_CT_ESTABLISHED; | |
564 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
565 | return IP_CT_RELATED; | |
566 | return IP_CT_NEW; | |
567 | } | |
568 | ||
569 | /* Find an existing connection which this packet belongs to without | |
570 | * re-attributing statistics or modifying the connection state. This allows an | |
5e17da63 | 571 | * skb->_nfct lost due to an upcall to be recovered during actions execution. |
289f2253 JR |
572 | * |
573 | * Must be called with rcu_read_lock. | |
574 | * | |
5e17da63 JR |
575 | * On success, populates skb->_nfct and returns the connection. Returns NULL |
576 | * if there is no existing entry. | |
289f2253 JR |
577 | */ |
578 | static struct nf_conn * | |
579 | ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone, | |
9ff464db | 580 | u8 l3num, struct sk_buff *skb, bool natted) |
289f2253 JR |
581 | { |
582 | struct nf_conntrack_l3proto *l3proto; | |
583 | struct nf_conntrack_l4proto *l4proto; | |
584 | struct nf_conntrack_tuple tuple; | |
585 | struct nf_conntrack_tuple_hash *h; | |
289f2253 JR |
586 | struct nf_conn *ct; |
587 | unsigned int dataoff; | |
588 | u8 protonum; | |
589 | ||
590 | l3proto = __nf_ct_l3proto_find(l3num); | |
289f2253 JR |
591 | if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff, |
592 | &protonum) <= 0) { | |
593 | pr_debug("ovs_ct_find_existing: Can't get protonum\n"); | |
594 | return NULL; | |
595 | } | |
596 | l4proto = __nf_ct_l4proto_find(l3num, protonum); | |
289f2253 JR |
597 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num, |
598 | protonum, net, &tuple, l3proto, l4proto)) { | |
599 | pr_debug("ovs_ct_find_existing: Can't get tuple\n"); | |
600 | return NULL; | |
601 | } | |
602 | ||
9ff464db JR |
603 | /* Must invert the tuple if skb has been transformed by NAT. */ |
604 | if (natted) { | |
605 | struct nf_conntrack_tuple inverse; | |
606 | ||
607 | if (!nf_ct_invert_tuple(&inverse, &tuple, l3proto, l4proto)) { | |
608 | pr_debug("ovs_ct_find_existing: Inversion failed!\n"); | |
609 | return NULL; | |
610 | } | |
611 | tuple = inverse; | |
612 | } | |
613 | ||
289f2253 JR |
614 | /* look for tuple match */ |
615 | h = nf_conntrack_find_get(net, zone, &tuple); | |
616 | if (!h) | |
617 | return NULL; /* Not found. */ | |
618 | ||
619 | ct = nf_ct_tuplehash_to_ctrack(h); | |
620 | ||
9ff464db JR |
621 | /* Inverted packet tuple matches the reverse direction conntrack tuple, |
622 | * select the other tuplehash to get the right 'ctinfo' bits for this | |
623 | * packet. | |
624 | */ | |
625 | if (natted) | |
626 | h = &ct->tuplehash[!h->tuple.dst.dir]; | |
627 | ||
c74454fa | 628 | nf_ct_set(skb, ct, ovs_ct_get_info(h)); |
289f2253 JR |
629 | return ct; |
630 | } | |
631 | ||
8b97ac5b GR |
632 | static |
633 | struct nf_conn *ovs_ct_executed(struct net *net, | |
634 | const struct sw_flow_key *key, | |
635 | const struct ovs_conntrack_info *info, | |
636 | struct sk_buff *skb, | |
637 | bool *ct_executed) | |
638 | { | |
639 | struct nf_conn *ct = NULL; | |
640 | ||
641 | /* If no ct, check if we have evidence that an existing conntrack entry | |
642 | * might be found for this skb. This happens when we lose a skb->_nfct | |
643 | * due to an upcall, or if the direction is being forced. If the | |
644 | * connection was not confirmed, it is not cached and needs to be run | |
645 | * through conntrack again. | |
646 | */ | |
647 | *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) && | |
648 | !(key->ct_state & OVS_CS_F_INVALID) && | |
649 | (key->ct_zone == info->zone.id); | |
650 | ||
651 | if (*ct_executed || (!key->ct_state && info->force)) { | |
652 | ct = ovs_ct_find_existing(net, &info->zone, info->family, skb, | |
653 | !!(key->ct_state & | |
654 | OVS_CS_F_NAT_MASK)); | |
655 | } | |
656 | ||
657 | return ct; | |
658 | } | |
659 | ||
5e17da63 | 660 | /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */ |
289f2253 JR |
661 | static bool skb_nfct_cached(struct net *net, |
662 | const struct sw_flow_key *key, | |
663 | const struct ovs_conntrack_info *info, | |
664 | struct sk_buff *skb) | |
7f8a436e JS |
665 | { |
666 | enum ip_conntrack_info ctinfo; | |
667 | struct nf_conn *ct; | |
8b97ac5b | 668 | bool ct_executed = true; |
7f8a436e JS |
669 | |
670 | ct = nf_ct_get(skb, &ctinfo); | |
671 | if (!ct) | |
8b97ac5b GR |
672 | ct = ovs_ct_executed(net, key, info, skb, &ct_executed); |
673 | ||
674 | if (ct) | |
675 | nf_ct_get(skb, &ctinfo); | |
676 | else | |
7f8a436e | 677 | return false; |
8b97ac5b | 678 | |
7f8a436e JS |
679 | if (!net_eq(net, read_pnet(&ct->ct_net))) |
680 | return false; | |
681 | if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) | |
682 | return false; | |
cae3a262 JS |
683 | if (info->helper) { |
684 | struct nf_conn_help *help; | |
685 | ||
686 | help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); | |
687 | if (help && rcu_access_pointer(help->helper) != info->helper) | |
688 | return false; | |
689 | } | |
dd41d33f JR |
690 | /* Force conntrack entry direction to the current packet? */ |
691 | if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) { | |
692 | /* Delete the conntrack entry if confirmed, else just release | |
693 | * the reference. | |
694 | */ | |
695 | if (nf_ct_is_confirmed(ct)) | |
696 | nf_ct_delete(ct, 0, 0); | |
b768b16d JR |
697 | |
698 | nf_conntrack_put(&ct->ct_general); | |
dd41d33f JR |
699 | nf_ct_set(skb, NULL, 0); |
700 | return false; | |
701 | } | |
7f8a436e | 702 | |
8b97ac5b | 703 | return ct_executed; |
7f8a436e JS |
704 | } |
705 | ||
05752523 JR |
706 | #ifdef CONFIG_NF_NAT_NEEDED |
707 | /* Modelled after nf_nat_ipv[46]_fn(). | |
708 | * range is only used for new, uninitialized NAT state. | |
709 | * Returns either NF_ACCEPT or NF_DROP. | |
710 | */ | |
711 | static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct, | |
712 | enum ip_conntrack_info ctinfo, | |
713 | const struct nf_nat_range *range, | |
714 | enum nf_nat_manip_type maniptype) | |
715 | { | |
716 | int hooknum, nh_off, err = NF_ACCEPT; | |
717 | ||
718 | nh_off = skb_network_offset(skb); | |
75f01a4c | 719 | skb_pull_rcsum(skb, nh_off); |
05752523 JR |
720 | |
721 | /* See HOOK2MANIP(). */ | |
722 | if (maniptype == NF_NAT_MANIP_SRC) | |
723 | hooknum = NF_INET_LOCAL_IN; /* Source NAT */ | |
724 | else | |
725 | hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */ | |
726 | ||
727 | switch (ctinfo) { | |
728 | case IP_CT_RELATED: | |
729 | case IP_CT_RELATED_REPLY: | |
99b7248e AB |
730 | if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && |
731 | skb->protocol == htons(ETH_P_IP) && | |
05752523 JR |
732 | ip_hdr(skb)->protocol == IPPROTO_ICMP) { |
733 | if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, | |
734 | hooknum)) | |
735 | err = NF_DROP; | |
736 | goto push; | |
99b7248e AB |
737 | } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && |
738 | skb->protocol == htons(ETH_P_IPV6)) { | |
05752523 JR |
739 | __be16 frag_off; |
740 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; | |
741 | int hdrlen = ipv6_skip_exthdr(skb, | |
742 | sizeof(struct ipv6hdr), | |
743 | &nexthdr, &frag_off); | |
744 | ||
745 | if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) { | |
746 | if (!nf_nat_icmpv6_reply_translation(skb, ct, | |
747 | ctinfo, | |
748 | hooknum, | |
749 | hdrlen)) | |
750 | err = NF_DROP; | |
751 | goto push; | |
752 | } | |
05752523 JR |
753 | } |
754 | /* Non-ICMP, fall thru to initialize if needed. */ | |
755 | case IP_CT_NEW: | |
756 | /* Seen it before? This can happen for loopback, retrans, | |
757 | * or local packets. | |
758 | */ | |
759 | if (!nf_nat_initialized(ct, maniptype)) { | |
760 | /* Initialize according to the NAT action. */ | |
761 | err = (range && range->flags & NF_NAT_RANGE_MAP_IPS) | |
762 | /* Action is set up to establish a new | |
763 | * mapping. | |
764 | */ | |
765 | ? nf_nat_setup_info(ct, range, maniptype) | |
766 | : nf_nat_alloc_null_binding(ct, hooknum); | |
767 | if (err != NF_ACCEPT) | |
768 | goto push; | |
769 | } | |
770 | break; | |
771 | ||
772 | case IP_CT_ESTABLISHED: | |
773 | case IP_CT_ESTABLISHED_REPLY: | |
774 | break; | |
775 | ||
776 | default: | |
777 | err = NF_DROP; | |
778 | goto push; | |
779 | } | |
780 | ||
781 | err = nf_nat_packet(ct, ctinfo, hooknum, skb); | |
782 | push: | |
783 | skb_push(skb, nh_off); | |
75f01a4c | 784 | skb_postpush_rcsum(skb, skb->data, nh_off); |
05752523 JR |
785 | |
786 | return err; | |
787 | } | |
788 | ||
789 | static void ovs_nat_update_key(struct sw_flow_key *key, | |
790 | const struct sk_buff *skb, | |
791 | enum nf_nat_manip_type maniptype) | |
792 | { | |
793 | if (maniptype == NF_NAT_MANIP_SRC) { | |
794 | __be16 src; | |
795 | ||
316d4d78 | 796 | key->ct_state |= OVS_CS_F_SRC_NAT; |
05752523 JR |
797 | if (key->eth.type == htons(ETH_P_IP)) |
798 | key->ipv4.addr.src = ip_hdr(skb)->saddr; | |
799 | else if (key->eth.type == htons(ETH_P_IPV6)) | |
800 | memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr, | |
801 | sizeof(key->ipv6.addr.src)); | |
802 | else | |
803 | return; | |
804 | ||
805 | if (key->ip.proto == IPPROTO_UDP) | |
806 | src = udp_hdr(skb)->source; | |
807 | else if (key->ip.proto == IPPROTO_TCP) | |
808 | src = tcp_hdr(skb)->source; | |
809 | else if (key->ip.proto == IPPROTO_SCTP) | |
810 | src = sctp_hdr(skb)->source; | |
811 | else | |
812 | return; | |
813 | ||
814 | key->tp.src = src; | |
815 | } else { | |
816 | __be16 dst; | |
817 | ||
316d4d78 | 818 | key->ct_state |= OVS_CS_F_DST_NAT; |
05752523 JR |
819 | if (key->eth.type == htons(ETH_P_IP)) |
820 | key->ipv4.addr.dst = ip_hdr(skb)->daddr; | |
821 | else if (key->eth.type == htons(ETH_P_IPV6)) | |
822 | memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr, | |
823 | sizeof(key->ipv6.addr.dst)); | |
824 | else | |
825 | return; | |
826 | ||
827 | if (key->ip.proto == IPPROTO_UDP) | |
828 | dst = udp_hdr(skb)->dest; | |
829 | else if (key->ip.proto == IPPROTO_TCP) | |
830 | dst = tcp_hdr(skb)->dest; | |
831 | else if (key->ip.proto == IPPROTO_SCTP) | |
832 | dst = sctp_hdr(skb)->dest; | |
833 | else | |
834 | return; | |
835 | ||
836 | key->tp.dst = dst; | |
837 | } | |
838 | } | |
839 | ||
840 | /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */ | |
841 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, | |
842 | const struct ovs_conntrack_info *info, | |
843 | struct sk_buff *skb, struct nf_conn *ct, | |
844 | enum ip_conntrack_info ctinfo) | |
845 | { | |
846 | enum nf_nat_manip_type maniptype; | |
847 | int err; | |
848 | ||
05752523 JR |
849 | /* Add NAT extension if not confirmed yet. */ |
850 | if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct)) | |
851 | return NF_ACCEPT; /* Can't NAT. */ | |
852 | ||
853 | /* Determine NAT type. | |
854 | * Check if the NAT type can be deduced from the tracked connection. | |
5745b0be JR |
855 | * Make sure new expected connections (IP_CT_RELATED) are NATted only |
856 | * when committing. | |
05752523 JR |
857 | */ |
858 | if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW && | |
859 | ct->status & IPS_NAT_MASK && | |
5745b0be | 860 | (ctinfo != IP_CT_RELATED || info->commit)) { |
05752523 JR |
861 | /* NAT an established or related connection like before. */ |
862 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) | |
863 | /* This is the REPLY direction for a connection | |
864 | * for which NAT was applied in the forward | |
865 | * direction. Do the reverse NAT. | |
866 | */ | |
867 | maniptype = ct->status & IPS_SRC_NAT | |
868 | ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC; | |
869 | else | |
870 | maniptype = ct->status & IPS_SRC_NAT | |
871 | ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST; | |
872 | } else if (info->nat & OVS_CT_SRC_NAT) { | |
873 | maniptype = NF_NAT_MANIP_SRC; | |
874 | } else if (info->nat & OVS_CT_DST_NAT) { | |
875 | maniptype = NF_NAT_MANIP_DST; | |
876 | } else { | |
877 | return NF_ACCEPT; /* Connection is not NATed. */ | |
878 | } | |
879 | err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype); | |
880 | ||
881 | /* Mark NAT done if successful and update the flow key. */ | |
882 | if (err == NF_ACCEPT) | |
883 | ovs_nat_update_key(key, skb, maniptype); | |
884 | ||
885 | return err; | |
886 | } | |
887 | #else /* !CONFIG_NF_NAT_NEEDED */ | |
888 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, | |
889 | const struct ovs_conntrack_info *info, | |
890 | struct sk_buff *skb, struct nf_conn *ct, | |
891 | enum ip_conntrack_info ctinfo) | |
892 | { | |
893 | return NF_ACCEPT; | |
894 | } | |
895 | #endif | |
896 | ||
9f13ded8 | 897 | /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if |
394e910e JR |
898 | * not done already. Update key with new CT state after passing the packet |
899 | * through conntrack. | |
5e17da63 | 900 | * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be |
9f13ded8 JR |
901 | * set to NULL and 0 will be returned. |
902 | */ | |
4f0909ee | 903 | static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, |
7f8a436e JS |
904 | const struct ovs_conntrack_info *info, |
905 | struct sk_buff *skb) | |
906 | { | |
907 | /* If we are recirculating packets to match on conntrack fields and | |
908 | * committing with a separate conntrack action, then we don't need to | |
909 | * actually run the packet through conntrack twice unless it's for a | |
910 | * different zone. | |
911 | */ | |
28b6e0c1 JR |
912 | bool cached = skb_nfct_cached(net, key, info, skb); |
913 | enum ip_conntrack_info ctinfo; | |
914 | struct nf_conn *ct; | |
915 | ||
916 | if (!cached) { | |
7f8a436e | 917 | struct nf_conn *tmpl = info->ct; |
5b6b9293 | 918 | int err; |
7f8a436e JS |
919 | |
920 | /* Associate skb with specified zone. */ | |
921 | if (tmpl) { | |
cb9c6836 FW |
922 | if (skb_nfct(skb)) |
923 | nf_conntrack_put(skb_nfct(skb)); | |
7f8a436e | 924 | nf_conntrack_get(&tmpl->ct_general); |
c74454fa | 925 | nf_ct_set(skb, tmpl, IP_CT_NEW); |
7f8a436e JS |
926 | } |
927 | ||
08733a0c PNA |
928 | err = nf_conntrack_in(net, info->family, |
929 | NF_INET_PRE_ROUTING, skb); | |
5b6b9293 | 930 | if (err != NF_ACCEPT) |
7f8a436e | 931 | return -ENOENT; |
cae3a262 | 932 | |
05752523 JR |
933 | /* Clear CT state NAT flags to mark that we have not yet done |
934 | * NAT after the nf_conntrack_in() call. We can actually clear | |
935 | * the whole state, as it will be re-initialized below. | |
936 | */ | |
316d4d78 | 937 | key->ct_state = 0; |
05752523 JR |
938 | |
939 | /* Update the key, but keep the NAT flags. */ | |
940 | ovs_ct_update_key(skb, info, key, true, true); | |
28b6e0c1 | 941 | } |
394e910e | 942 | |
28b6e0c1 | 943 | ct = nf_ct_get(skb, &ctinfo); |
05752523 JR |
944 | if (ct) { |
945 | /* Packets starting a new connection must be NATted before the | |
946 | * helper, so that the helper knows about the NAT. We enforce | |
947 | * this by delaying both NAT and helper calls for unconfirmed | |
948 | * connections until the committing CT action. For later | |
949 | * packets NAT and Helper may be called in either order. | |
950 | * | |
951 | * NAT will be done only if the CT action has NAT, and only | |
952 | * once per packet (per zone), as guarded by the NAT bits in | |
316d4d78 | 953 | * the key->ct_state. |
05752523 | 954 | */ |
316d4d78 | 955 | if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) && |
05752523 JR |
956 | (nf_ct_is_confirmed(ct) || info->commit) && |
957 | ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) { | |
958 | return -EINVAL; | |
959 | } | |
960 | ||
16ec3d4f JS |
961 | /* Userspace may decide to perform a ct lookup without a helper |
962 | * specified followed by a (recirculate and) commit with one. | |
963 | * Therefore, for unconfirmed connections which we will commit, | |
964 | * we need to attach the helper here. | |
965 | */ | |
966 | if (!nf_ct_is_confirmed(ct) && info->commit && | |
967 | info->helper && !nfct_help(ct)) { | |
968 | int err = __nf_ct_try_assign_helper(ct, info->ct, | |
969 | GFP_ATOMIC); | |
970 | if (err) | |
971 | return err; | |
972 | } | |
973 | ||
05752523 JR |
974 | /* Call the helper only if: |
975 | * - nf_conntrack_in() was executed above ("!cached") for a | |
976 | * confirmed connection, or | |
977 | * - When committing an unconfirmed connection. | |
978 | */ | |
979 | if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) && | |
980 | ovs_ct_helper(skb, info->family) != NF_ACCEPT) { | |
981 | return -EINVAL; | |
982 | } | |
7f8a436e JS |
983 | } |
984 | ||
985 | return 0; | |
986 | } | |
987 | ||
988 | /* Lookup connection and read fields into key. */ | |
989 | static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, | |
990 | const struct ovs_conntrack_info *info, | |
991 | struct sk_buff *skb) | |
992 | { | |
993 | struct nf_conntrack_expect *exp; | |
994 | ||
9f13ded8 JR |
995 | /* If we pass an expected packet through nf_conntrack_in() the |
996 | * expectation is typically removed, but the packet could still be | |
997 | * lost in upcall processing. To prevent this from happening we | |
998 | * perform an explicit expectation lookup. Expected connections are | |
999 | * always new, and will be passed through conntrack only when they are | |
1000 | * committed, as it is OK to remove the expectation at that time. | |
1001 | */ | |
7f8a436e JS |
1002 | exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); |
1003 | if (exp) { | |
1004 | u8 state; | |
1005 | ||
05752523 JR |
1006 | /* NOTE: New connections are NATted and Helped only when |
1007 | * committed, so we are not calling into NAT here. | |
1008 | */ | |
7f8a436e | 1009 | state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; |
182e3042 | 1010 | __ovs_ct_update_key(key, state, &info->zone, exp->master); |
d913d3a7 SG |
1011 | } else { |
1012 | struct nf_conn *ct; | |
1013 | int err; | |
1014 | ||
1015 | err = __ovs_ct_lookup(net, key, info, skb); | |
1016 | if (err) | |
1017 | return err; | |
1018 | ||
cb9c6836 | 1019 | ct = (struct nf_conn *)skb_nfct(skb); |
d913d3a7 SG |
1020 | if (ct) |
1021 | nf_ct_deliver_cached_events(ct); | |
1022 | } | |
7f8a436e JS |
1023 | |
1024 | return 0; | |
1025 | } | |
1026 | ||
33db4125 | 1027 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels) |
c2ac6673 JS |
1028 | { |
1029 | size_t i; | |
1030 | ||
cb80d58f JR |
1031 | for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) |
1032 | if (labels->ct_labels_32[i]) | |
c2ac6673 JS |
1033 | return true; |
1034 | ||
1035 | return false; | |
1036 | } | |
1037 | ||
7d904c7b JR |
1038 | /* Lookup connection and confirm if unconfirmed. */ |
1039 | static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, | |
1040 | const struct ovs_conntrack_info *info, | |
1041 | struct sk_buff *skb) | |
1042 | { | |
6ffcea79 JR |
1043 | enum ip_conntrack_info ctinfo; |
1044 | struct nf_conn *ct; | |
7d904c7b JR |
1045 | int err; |
1046 | ||
1047 | err = __ovs_ct_lookup(net, key, info, skb); | |
1048 | if (err) | |
1049 | return err; | |
1050 | ||
6ffcea79 JR |
1051 | /* The connection could be invalid, in which case this is a no-op.*/ |
1052 | ct = nf_ct_get(skb, &ctinfo); | |
1053 | if (!ct) | |
1054 | return 0; | |
1055 | ||
12064551 JR |
1056 | /* Set the conntrack event mask if given. NEW and DELETE events have |
1057 | * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener | |
1058 | * typically would receive many kinds of updates. Setting the event | |
1059 | * mask allows those events to be filtered. The set event mask will | |
1060 | * remain in effect for the lifetime of the connection unless changed | |
1061 | * by a further CT action with both the commit flag and the eventmask | |
1062 | * option. */ | |
1063 | if (info->have_eventmask) { | |
1064 | struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct); | |
1065 | ||
1066 | if (cache) | |
1067 | cache->ctmask = info->eventmask; | |
1068 | } | |
1069 | ||
7d904c7b JR |
1070 | /* Apply changes before confirming the connection so that the initial |
1071 | * conntrack NEW netlink event carries the values given in the CT | |
1072 | * action. | |
1073 | */ | |
1074 | if (info->mark.mask) { | |
6ffcea79 | 1075 | err = ovs_ct_set_mark(ct, key, info->mark.value, |
7d904c7b JR |
1076 | info->mark.mask); |
1077 | if (err) | |
1078 | return err; | |
1079 | } | |
09aa98ad JR |
1080 | if (!nf_ct_is_confirmed(ct)) { |
1081 | err = ovs_ct_init_labels(ct, key, &info->labels.value, | |
1082 | &info->labels.mask); | |
1083 | if (err) | |
1084 | return err; | |
1085 | } else if (labels_nonzero(&info->labels.mask)) { | |
1086 | err = ovs_ct_set_labels(ct, key, &info->labels.value, | |
1087 | &info->labels.mask); | |
7d904c7b JR |
1088 | if (err) |
1089 | return err; | |
1090 | } | |
1091 | /* This will take care of sending queued events even if the connection | |
1092 | * is already confirmed. | |
1093 | */ | |
1094 | if (nf_conntrack_confirm(skb) != NF_ACCEPT) | |
1095 | return -EINVAL; | |
1096 | ||
1097 | return 0; | |
1098 | } | |
1099 | ||
74c16618 JS |
1100 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
1101 | * value if 'skb' is freed. | |
1102 | */ | |
7f8a436e JS |
1103 | int ovs_ct_execute(struct net *net, struct sk_buff *skb, |
1104 | struct sw_flow_key *key, | |
1105 | const struct ovs_conntrack_info *info) | |
1106 | { | |
1107 | int nh_ofs; | |
1108 | int err; | |
1109 | ||
1110 | /* The conntrack module expects to be working at L3. */ | |
1111 | nh_ofs = skb_network_offset(skb); | |
75f01a4c | 1112 | skb_pull_rcsum(skb, nh_ofs); |
7f8a436e JS |
1113 | |
1114 | if (key->ip.frag != OVS_FRAG_TYPE_NONE) { | |
1115 | err = handle_fragments(net, key, info->zone.id, skb); | |
1116 | if (err) | |
1117 | return err; | |
1118 | } | |
1119 | ||
ab38a7b5 | 1120 | if (info->commit) |
7d904c7b | 1121 | err = ovs_ct_commit(net, key, info, skb); |
7f8a436e JS |
1122 | else |
1123 | err = ovs_ct_lookup(net, key, info, skb); | |
1124 | ||
1125 | skb_push(skb, nh_ofs); | |
75f01a4c | 1126 | skb_postpush_rcsum(skb, skb->data, nh_ofs); |
74c16618 JS |
1127 | if (err) |
1128 | kfree_skb(skb); | |
7f8a436e JS |
1129 | return err; |
1130 | } | |
1131 | ||
cae3a262 JS |
1132 | static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, |
1133 | const struct sw_flow_key *key, bool log) | |
1134 | { | |
1135 | struct nf_conntrack_helper *helper; | |
1136 | struct nf_conn_help *help; | |
1137 | ||
1138 | helper = nf_conntrack_helper_try_module_get(name, info->family, | |
1139 | key->ip.proto); | |
1140 | if (!helper) { | |
1141 | OVS_NLERR(log, "Unknown helper \"%s\"", name); | |
1142 | return -EINVAL; | |
1143 | } | |
1144 | ||
1145 | help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); | |
1146 | if (!help) { | |
d91fc59c | 1147 | nf_conntrack_helper_put(helper); |
cae3a262 JS |
1148 | return -ENOMEM; |
1149 | } | |
1150 | ||
1151 | rcu_assign_pointer(help->helper, helper); | |
1152 | info->helper = helper; | |
1153 | return 0; | |
1154 | } | |
1155 | ||
05752523 JR |
1156 | #ifdef CONFIG_NF_NAT_NEEDED |
1157 | static int parse_nat(const struct nlattr *attr, | |
1158 | struct ovs_conntrack_info *info, bool log) | |
1159 | { | |
1160 | struct nlattr *a; | |
1161 | int rem; | |
1162 | bool have_ip_max = false; | |
1163 | bool have_proto_max = false; | |
1164 | bool ip_vers = (info->family == NFPROTO_IPV6); | |
1165 | ||
1166 | nla_for_each_nested(a, attr, rem) { | |
1167 | static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = { | |
1168 | [OVS_NAT_ATTR_SRC] = {0, 0}, | |
1169 | [OVS_NAT_ATTR_DST] = {0, 0}, | |
1170 | [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr), | |
1171 | sizeof(struct in6_addr)}, | |
1172 | [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr), | |
1173 | sizeof(struct in6_addr)}, | |
1174 | [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)}, | |
1175 | [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)}, | |
1176 | [OVS_NAT_ATTR_PERSISTENT] = {0, 0}, | |
1177 | [OVS_NAT_ATTR_PROTO_HASH] = {0, 0}, | |
1178 | [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0}, | |
1179 | }; | |
1180 | int type = nla_type(a); | |
1181 | ||
1182 | if (type > OVS_NAT_ATTR_MAX) { | |
1183 | OVS_NLERR(log, | |
1184 | "Unknown NAT attribute (type=%d, max=%d).\n", | |
1185 | type, OVS_NAT_ATTR_MAX); | |
1186 | return -EINVAL; | |
1187 | } | |
1188 | ||
1189 | if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) { | |
1190 | OVS_NLERR(log, | |
1191 | "NAT attribute type %d has unexpected length (%d != %d).\n", | |
1192 | type, nla_len(a), | |
1193 | ovs_nat_attr_lens[type][ip_vers]); | |
1194 | return -EINVAL; | |
1195 | } | |
1196 | ||
1197 | switch (type) { | |
1198 | case OVS_NAT_ATTR_SRC: | |
1199 | case OVS_NAT_ATTR_DST: | |
1200 | if (info->nat) { | |
1201 | OVS_NLERR(log, | |
1202 | "Only one type of NAT may be specified.\n" | |
1203 | ); | |
1204 | return -ERANGE; | |
1205 | } | |
1206 | info->nat |= OVS_CT_NAT; | |
1207 | info->nat |= ((type == OVS_NAT_ATTR_SRC) | |
1208 | ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT); | |
1209 | break; | |
1210 | ||
1211 | case OVS_NAT_ATTR_IP_MIN: | |
ac71b46e HY |
1212 | nla_memcpy(&info->range.min_addr, a, |
1213 | sizeof(info->range.min_addr)); | |
05752523 JR |
1214 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; |
1215 | break; | |
1216 | ||
1217 | case OVS_NAT_ATTR_IP_MAX: | |
1218 | have_ip_max = true; | |
1219 | nla_memcpy(&info->range.max_addr, a, | |
1220 | sizeof(info->range.max_addr)); | |
1221 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; | |
1222 | break; | |
1223 | ||
1224 | case OVS_NAT_ATTR_PROTO_MIN: | |
1225 | info->range.min_proto.all = htons(nla_get_u16(a)); | |
1226 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; | |
1227 | break; | |
1228 | ||
1229 | case OVS_NAT_ATTR_PROTO_MAX: | |
1230 | have_proto_max = true; | |
1231 | info->range.max_proto.all = htons(nla_get_u16(a)); | |
1232 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; | |
1233 | break; | |
1234 | ||
1235 | case OVS_NAT_ATTR_PERSISTENT: | |
1236 | info->range.flags |= NF_NAT_RANGE_PERSISTENT; | |
1237 | break; | |
1238 | ||
1239 | case OVS_NAT_ATTR_PROTO_HASH: | |
1240 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM; | |
1241 | break; | |
1242 | ||
1243 | case OVS_NAT_ATTR_PROTO_RANDOM: | |
1244 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; | |
1245 | break; | |
1246 | ||
1247 | default: | |
1248 | OVS_NLERR(log, "Unknown nat attribute (%d).\n", type); | |
1249 | return -EINVAL; | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | if (rem > 0) { | |
1254 | OVS_NLERR(log, "NAT attribute has %d unknown bytes.\n", rem); | |
1255 | return -EINVAL; | |
1256 | } | |
1257 | if (!info->nat) { | |
1258 | /* Do not allow flags if no type is given. */ | |
1259 | if (info->range.flags) { | |
1260 | OVS_NLERR(log, | |
1261 | "NAT flags may be given only when NAT range (SRC or DST) is also specified.\n" | |
1262 | ); | |
1263 | return -EINVAL; | |
1264 | } | |
1265 | info->nat = OVS_CT_NAT; /* NAT existing connections. */ | |
1266 | } else if (!info->commit) { | |
1267 | OVS_NLERR(log, | |
1268 | "NAT attributes may be specified only when CT COMMIT flag is also specified.\n" | |
1269 | ); | |
1270 | return -EINVAL; | |
1271 | } | |
1272 | /* Allow missing IP_MAX. */ | |
1273 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) { | |
1274 | memcpy(&info->range.max_addr, &info->range.min_addr, | |
1275 | sizeof(info->range.max_addr)); | |
1276 | } | |
1277 | /* Allow missing PROTO_MAX. */ | |
1278 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && | |
1279 | !have_proto_max) { | |
1280 | info->range.max_proto.all = info->range.min_proto.all; | |
1281 | } | |
1282 | return 0; | |
1283 | } | |
1284 | #endif | |
1285 | ||
7f8a436e | 1286 | static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { |
ab38a7b5 | 1287 | [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
dd41d33f | 1288 | [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
7f8a436e JS |
1289 | [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), |
1290 | .maxlen = sizeof(u16) }, | |
182e3042 JS |
1291 | [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), |
1292 | .maxlen = sizeof(struct md_mark) }, | |
33db4125 JS |
1293 | [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), |
1294 | .maxlen = sizeof(struct md_labels) }, | |
cae3a262 | 1295 | [OVS_CT_ATTR_HELPER] = { .minlen = 1, |
05752523 JR |
1296 | .maxlen = NF_CT_HELPER_NAME_LEN }, |
1297 | #ifdef CONFIG_NF_NAT_NEEDED | |
1298 | /* NAT length is checked when parsing the nested attributes. */ | |
1299 | [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX }, | |
1300 | #endif | |
12064551 JR |
1301 | [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32), |
1302 | .maxlen = sizeof(u32) }, | |
7f8a436e JS |
1303 | }; |
1304 | ||
1305 | static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, | |
cae3a262 | 1306 | const char **helper, bool log) |
7f8a436e JS |
1307 | { |
1308 | struct nlattr *a; | |
1309 | int rem; | |
1310 | ||
1311 | nla_for_each_nested(a, attr, rem) { | |
1312 | int type = nla_type(a); | |
69ec932e LZ |
1313 | int maxlen; |
1314 | int minlen; | |
7f8a436e JS |
1315 | |
1316 | if (type > OVS_CT_ATTR_MAX) { | |
1317 | OVS_NLERR(log, | |
1318 | "Unknown conntrack attr (type=%d, max=%d)", | |
1319 | type, OVS_CT_ATTR_MAX); | |
1320 | return -EINVAL; | |
1321 | } | |
69ec932e LZ |
1322 | |
1323 | maxlen = ovs_ct_attr_lens[type].maxlen; | |
1324 | minlen = ovs_ct_attr_lens[type].minlen; | |
7f8a436e JS |
1325 | if (nla_len(a) < minlen || nla_len(a) > maxlen) { |
1326 | OVS_NLERR(log, | |
1327 | "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", | |
1328 | type, nla_len(a), maxlen); | |
1329 | return -EINVAL; | |
1330 | } | |
1331 | ||
1332 | switch (type) { | |
dd41d33f JR |
1333 | case OVS_CT_ATTR_FORCE_COMMIT: |
1334 | info->force = true; | |
1335 | /* fall through. */ | |
ab38a7b5 JS |
1336 | case OVS_CT_ATTR_COMMIT: |
1337 | info->commit = true; | |
7f8a436e JS |
1338 | break; |
1339 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
1340 | case OVS_CT_ATTR_ZONE: | |
1341 | info->zone.id = nla_get_u16(a); | |
1342 | break; | |
182e3042 JS |
1343 | #endif |
1344 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
1345 | case OVS_CT_ATTR_MARK: { | |
1346 | struct md_mark *mark = nla_data(a); | |
1347 | ||
e754ec69 JS |
1348 | if (!mark->mask) { |
1349 | OVS_NLERR(log, "ct_mark mask cannot be 0"); | |
1350 | return -EINVAL; | |
1351 | } | |
182e3042 JS |
1352 | info->mark = *mark; |
1353 | break; | |
1354 | } | |
c2ac6673 JS |
1355 | #endif |
1356 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
33db4125 JS |
1357 | case OVS_CT_ATTR_LABELS: { |
1358 | struct md_labels *labels = nla_data(a); | |
c2ac6673 | 1359 | |
e754ec69 JS |
1360 | if (!labels_nonzero(&labels->mask)) { |
1361 | OVS_NLERR(log, "ct_labels mask cannot be 0"); | |
1362 | return -EINVAL; | |
1363 | } | |
33db4125 | 1364 | info->labels = *labels; |
c2ac6673 JS |
1365 | break; |
1366 | } | |
7f8a436e | 1367 | #endif |
cae3a262 JS |
1368 | case OVS_CT_ATTR_HELPER: |
1369 | *helper = nla_data(a); | |
1370 | if (!memchr(*helper, '\0', nla_len(a))) { | |
1371 | OVS_NLERR(log, "Invalid conntrack helper"); | |
1372 | return -EINVAL; | |
1373 | } | |
1374 | break; | |
05752523 JR |
1375 | #ifdef CONFIG_NF_NAT_NEEDED |
1376 | case OVS_CT_ATTR_NAT: { | |
1377 | int err = parse_nat(a, info, log); | |
1378 | ||
1379 | if (err) | |
1380 | return err; | |
1381 | break; | |
1382 | } | |
1383 | #endif | |
12064551 JR |
1384 | case OVS_CT_ATTR_EVENTMASK: |
1385 | info->have_eventmask = true; | |
1386 | info->eventmask = nla_get_u32(a); | |
1387 | break; | |
1388 | ||
7f8a436e JS |
1389 | default: |
1390 | OVS_NLERR(log, "Unknown conntrack attr (%d)", | |
1391 | type); | |
1392 | return -EINVAL; | |
1393 | } | |
1394 | } | |
1395 | ||
7d904c7b JR |
1396 | #ifdef CONFIG_NF_CONNTRACK_MARK |
1397 | if (!info->commit && info->mark.mask) { | |
1398 | OVS_NLERR(log, | |
1399 | "Setting conntrack mark requires 'commit' flag."); | |
1400 | return -EINVAL; | |
1401 | } | |
1402 | #endif | |
1403 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
1404 | if (!info->commit && labels_nonzero(&info->labels.mask)) { | |
1405 | OVS_NLERR(log, | |
1406 | "Setting conntrack labels requires 'commit' flag."); | |
1407 | return -EINVAL; | |
1408 | } | |
1409 | #endif | |
7f8a436e JS |
1410 | if (rem > 0) { |
1411 | OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); | |
1412 | return -EINVAL; | |
1413 | } | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
c2ac6673 | 1418 | bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) |
7f8a436e JS |
1419 | { |
1420 | if (attr == OVS_KEY_ATTR_CT_STATE) | |
1421 | return true; | |
1422 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
1423 | attr == OVS_KEY_ATTR_CT_ZONE) | |
1424 | return true; | |
182e3042 JS |
1425 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
1426 | attr == OVS_KEY_ATTR_CT_MARK) | |
1427 | return true; | |
c2ac6673 | 1428 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
33db4125 | 1429 | attr == OVS_KEY_ATTR_CT_LABELS) { |
c2ac6673 JS |
1430 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
1431 | ||
1432 | return ovs_net->xt_label; | |
1433 | } | |
7f8a436e JS |
1434 | |
1435 | return false; | |
1436 | } | |
1437 | ||
1438 | int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, | |
1439 | const struct sw_flow_key *key, | |
1440 | struct sw_flow_actions **sfa, bool log) | |
1441 | { | |
1442 | struct ovs_conntrack_info ct_info; | |
cae3a262 | 1443 | const char *helper = NULL; |
7f8a436e JS |
1444 | u16 family; |
1445 | int err; | |
1446 | ||
1447 | family = key_to_nfproto(key); | |
1448 | if (family == NFPROTO_UNSPEC) { | |
1449 | OVS_NLERR(log, "ct family unspecified"); | |
1450 | return -EINVAL; | |
1451 | } | |
1452 | ||
1453 | memset(&ct_info, 0, sizeof(ct_info)); | |
1454 | ct_info.family = family; | |
1455 | ||
1456 | nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, | |
1457 | NF_CT_DEFAULT_ZONE_DIR, 0); | |
1458 | ||
cae3a262 | 1459 | err = parse_ct(attr, &ct_info, &helper, log); |
7f8a436e JS |
1460 | if (err) |
1461 | return err; | |
1462 | ||
1463 | /* Set up template for tracking connections in specific zones. */ | |
1464 | ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); | |
1465 | if (!ct_info.ct) { | |
1466 | OVS_NLERR(log, "Failed to allocate conntrack template"); | |
1467 | return -ENOMEM; | |
1468 | } | |
90c7afc9 JS |
1469 | |
1470 | __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); | |
1471 | nf_conntrack_get(&ct_info.ct->ct_general); | |
1472 | ||
cae3a262 JS |
1473 | if (helper) { |
1474 | err = ovs_ct_add_helper(&ct_info, helper, key, log); | |
1475 | if (err) | |
1476 | goto err_free_ct; | |
1477 | } | |
7f8a436e JS |
1478 | |
1479 | err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, | |
1480 | sizeof(ct_info), log); | |
1481 | if (err) | |
1482 | goto err_free_ct; | |
1483 | ||
7f8a436e JS |
1484 | return 0; |
1485 | err_free_ct: | |
2f3ab9f9 | 1486 | __ovs_ct_free_action(&ct_info); |
7f8a436e JS |
1487 | return err; |
1488 | } | |
1489 | ||
05752523 JR |
1490 | #ifdef CONFIG_NF_NAT_NEEDED |
1491 | static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info, | |
1492 | struct sk_buff *skb) | |
1493 | { | |
1494 | struct nlattr *start; | |
1495 | ||
1496 | start = nla_nest_start(skb, OVS_CT_ATTR_NAT); | |
1497 | if (!start) | |
1498 | return false; | |
1499 | ||
1500 | if (info->nat & OVS_CT_SRC_NAT) { | |
1501 | if (nla_put_flag(skb, OVS_NAT_ATTR_SRC)) | |
1502 | return false; | |
1503 | } else if (info->nat & OVS_CT_DST_NAT) { | |
1504 | if (nla_put_flag(skb, OVS_NAT_ATTR_DST)) | |
1505 | return false; | |
1506 | } else { | |
1507 | goto out; | |
1508 | } | |
1509 | ||
1510 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS) { | |
99b7248e AB |
1511 | if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && |
1512 | info->family == NFPROTO_IPV4) { | |
05752523 JR |
1513 | if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN, |
1514 | info->range.min_addr.ip) || | |
1515 | (info->range.max_addr.ip | |
1516 | != info->range.min_addr.ip && | |
1517 | (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX, | |
1518 | info->range.max_addr.ip)))) | |
1519 | return false; | |
99b7248e AB |
1520 | } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && |
1521 | info->family == NFPROTO_IPV6) { | |
05752523 JR |
1522 | if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN, |
1523 | &info->range.min_addr.in6) || | |
1524 | (memcmp(&info->range.max_addr.in6, | |
1525 | &info->range.min_addr.in6, | |
1526 | sizeof(info->range.max_addr.in6)) && | |
1527 | (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX, | |
1528 | &info->range.max_addr.in6)))) | |
1529 | return false; | |
05752523 JR |
1530 | } else { |
1531 | return false; | |
1532 | } | |
1533 | } | |
1534 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && | |
1535 | (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN, | |
1536 | ntohs(info->range.min_proto.all)) || | |
1537 | (info->range.max_proto.all != info->range.min_proto.all && | |
1538 | nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX, | |
1539 | ntohs(info->range.max_proto.all))))) | |
1540 | return false; | |
1541 | ||
1542 | if (info->range.flags & NF_NAT_RANGE_PERSISTENT && | |
1543 | nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT)) | |
1544 | return false; | |
1545 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM && | |
1546 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH)) | |
1547 | return false; | |
1548 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY && | |
1549 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM)) | |
1550 | return false; | |
1551 | out: | |
1552 | nla_nest_end(skb, start); | |
1553 | ||
1554 | return true; | |
1555 | } | |
1556 | #endif | |
1557 | ||
7f8a436e JS |
1558 | int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, |
1559 | struct sk_buff *skb) | |
1560 | { | |
1561 | struct nlattr *start; | |
1562 | ||
1563 | start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); | |
1564 | if (!start) | |
1565 | return -EMSGSIZE; | |
1566 | ||
dd41d33f JR |
1567 | if (ct_info->commit && nla_put_flag(skb, ct_info->force |
1568 | ? OVS_CT_ATTR_FORCE_COMMIT | |
1569 | : OVS_CT_ATTR_COMMIT)) | |
7f8a436e JS |
1570 | return -EMSGSIZE; |
1571 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
1572 | nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) | |
1573 | return -EMSGSIZE; | |
e754ec69 | 1574 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && |
182e3042 JS |
1575 | nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), |
1576 | &ct_info->mark)) | |
1577 | return -EMSGSIZE; | |
c2ac6673 | 1578 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
e754ec69 | 1579 | labels_nonzero(&ct_info->labels.mask) && |
33db4125 JS |
1580 | nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), |
1581 | &ct_info->labels)) | |
c2ac6673 | 1582 | return -EMSGSIZE; |
cae3a262 JS |
1583 | if (ct_info->helper) { |
1584 | if (nla_put_string(skb, OVS_CT_ATTR_HELPER, | |
1585 | ct_info->helper->name)) | |
1586 | return -EMSGSIZE; | |
1587 | } | |
12064551 JR |
1588 | if (ct_info->have_eventmask && |
1589 | nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask)) | |
1590 | return -EMSGSIZE; | |
1591 | ||
05752523 JR |
1592 | #ifdef CONFIG_NF_NAT_NEEDED |
1593 | if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb)) | |
1594 | return -EMSGSIZE; | |
1595 | #endif | |
7f8a436e JS |
1596 | nla_nest_end(skb, start); |
1597 | ||
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | void ovs_ct_free_action(const struct nlattr *a) | |
1602 | { | |
1603 | struct ovs_conntrack_info *ct_info = nla_data(a); | |
1604 | ||
2f3ab9f9 JS |
1605 | __ovs_ct_free_action(ct_info); |
1606 | } | |
1607 | ||
1608 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info) | |
1609 | { | |
cae3a262 | 1610 | if (ct_info->helper) |
d91fc59c | 1611 | nf_conntrack_helper_put(ct_info->helper); |
7f8a436e | 1612 | if (ct_info->ct) |
76644232 | 1613 | nf_ct_tmpl_free(ct_info->ct); |
7f8a436e | 1614 | } |
c2ac6673 JS |
1615 | |
1616 | void ovs_ct_init(struct net *net) | |
1617 | { | |
33db4125 | 1618 | unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; |
c2ac6673 JS |
1619 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
1620 | ||
adff6c65 | 1621 | if (nf_connlabels_get(net, n_bits - 1)) { |
c2ac6673 JS |
1622 | ovs_net->xt_label = false; |
1623 | OVS_NLERR(true, "Failed to set connlabel length"); | |
1624 | } else { | |
1625 | ovs_net->xt_label = true; | |
1626 | } | |
1627 | } | |
1628 | ||
1629 | void ovs_ct_exit(struct net *net) | |
1630 | { | |
1631 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
1632 | ||
1633 | if (ovs_net->xt_label) | |
1634 | nf_connlabels_put(net); | |
1635 | } |