Commit | Line | Data |
---|---|---|
5b497af4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7f8a436e JS |
2 | /* |
3 | * Copyright (c) 2015 Nicira, Inc. | |
7f8a436e JS |
4 | */ |
5 | ||
6 | #include <linux/module.h> | |
7 | #include <linux/openvswitch.h> | |
05752523 JR |
8 | #include <linux/tcp.h> |
9 | #include <linux/udp.h> | |
10 | #include <linux/sctp.h> | |
11efd5cb | 11 | #include <linux/static_key.h> |
7f8a436e | 12 | #include <net/ip.h> |
11efd5cb | 13 | #include <net/genetlink.h> |
7f8a436e | 14 | #include <net/netfilter/nf_conntrack_core.h> |
11efd5cb | 15 | #include <net/netfilter/nf_conntrack_count.h> |
cae3a262 | 16 | #include <net/netfilter/nf_conntrack_helper.h> |
c2ac6673 | 17 | #include <net/netfilter/nf_conntrack_labels.h> |
05752523 | 18 | #include <net/netfilter/nf_conntrack_seqadj.h> |
06bd2bdf | 19 | #include <net/netfilter/nf_conntrack_timeout.h> |
7f8a436e JS |
20 | #include <net/netfilter/nf_conntrack_zones.h> |
21 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> | |
70b095c8 | 22 | #include <net/ipv6_frag.h> |
7f8a436e | 23 | |
4806e975 | 24 | #if IS_ENABLED(CONFIG_NF_NAT) |
d2c5c103 | 25 | #include <net/netfilter/nf_nat.h> |
05752523 JR |
26 | #endif |
27 | ||
7f8a436e JS |
28 | #include "datapath.h" |
29 | #include "conntrack.h" | |
30 | #include "flow.h" | |
31 | #include "flow_netlink.h" | |
32 | ||
33 | struct ovs_ct_len_tbl { | |
05752523 JR |
34 | int maxlen; |
35 | int minlen; | |
7f8a436e JS |
36 | }; |
37 | ||
182e3042 JS |
38 | /* Metadata mark for masked write to conntrack mark */ |
39 | struct md_mark { | |
40 | u32 value; | |
41 | u32 mask; | |
42 | }; | |
43 | ||
c2ac6673 | 44 | /* Metadata label for masked write to conntrack label. */ |
33db4125 JS |
45 | struct md_labels { |
46 | struct ovs_key_ct_labels value; | |
47 | struct ovs_key_ct_labels mask; | |
c2ac6673 JS |
48 | }; |
49 | ||
05752523 JR |
50 | enum ovs_ct_nat { |
51 | OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ | |
52 | OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ | |
53 | OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */ | |
54 | }; | |
55 | ||
7f8a436e JS |
56 | /* Conntrack action context for execution. */ |
57 | struct ovs_conntrack_info { | |
cae3a262 | 58 | struct nf_conntrack_helper *helper; |
7f8a436e JS |
59 | struct nf_conntrack_zone zone; |
60 | struct nf_conn *ct; | |
ab38a7b5 | 61 | u8 commit : 1; |
05752523 | 62 | u8 nat : 3; /* enum ovs_ct_nat */ |
dd41d33f | 63 | u8 force : 1; |
12064551 | 64 | u8 have_eventmask : 1; |
7f8a436e | 65 | u16 family; |
12064551 | 66 | u32 eventmask; /* Mask of 1 << IPCT_*. */ |
182e3042 | 67 | struct md_mark mark; |
33db4125 | 68 | struct md_labels labels; |
06bd2bdf | 69 | char timeout[CTNL_TIMEOUT_NAME_MAX]; |
71778951 | 70 | struct nf_ct_timeout *nf_ct_timeout; |
4806e975 | 71 | #if IS_ENABLED(CONFIG_NF_NAT) |
2eb0f624 | 72 | struct nf_nat_range2 range; /* Only present for SRC NAT and DST NAT. */ |
05752523 | 73 | #endif |
7f8a436e JS |
74 | }; |
75 | ||
11efd5cb YHW |
76 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
77 | #define OVS_CT_LIMIT_UNLIMITED 0 | |
78 | #define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED | |
79 | #define CT_LIMIT_HASH_BUCKETS 512 | |
80 | static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled); | |
81 | ||
82 | struct ovs_ct_limit { | |
83 | /* Elements in ovs_ct_limit_info->limits hash table */ | |
84 | struct hlist_node hlist_node; | |
85 | struct rcu_head rcu; | |
86 | u16 zone; | |
87 | u32 limit; | |
88 | }; | |
89 | ||
90 | struct ovs_ct_limit_info { | |
91 | u32 default_limit; | |
92 | struct hlist_head *limits; | |
93 | struct nf_conncount_data *data; | |
94 | }; | |
95 | ||
96 | static const struct nla_policy ct_limit_policy[OVS_CT_LIMIT_ATTR_MAX + 1] = { | |
97 | [OVS_CT_LIMIT_ATTR_ZONE_LIMIT] = { .type = NLA_NESTED, }, | |
98 | }; | |
99 | #endif | |
100 | ||
09aa98ad JR |
101 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels); |
102 | ||
2f3ab9f9 JS |
103 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); |
104 | ||
7f8a436e JS |
105 | static u16 key_to_nfproto(const struct sw_flow_key *key) |
106 | { | |
107 | switch (ntohs(key->eth.type)) { | |
108 | case ETH_P_IP: | |
109 | return NFPROTO_IPV4; | |
110 | case ETH_P_IPV6: | |
111 | return NFPROTO_IPV6; | |
112 | default: | |
113 | return NFPROTO_UNSPEC; | |
114 | } | |
115 | } | |
116 | ||
117 | /* Map SKB connection state into the values used by flow definition. */ | |
118 | static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) | |
119 | { | |
120 | u8 ct_state = OVS_CS_F_TRACKED; | |
121 | ||
122 | switch (ctinfo) { | |
123 | case IP_CT_ESTABLISHED_REPLY: | |
124 | case IP_CT_RELATED_REPLY: | |
7f8a436e JS |
125 | ct_state |= OVS_CS_F_REPLY_DIR; |
126 | break; | |
127 | default: | |
128 | break; | |
129 | } | |
130 | ||
131 | switch (ctinfo) { | |
132 | case IP_CT_ESTABLISHED: | |
133 | case IP_CT_ESTABLISHED_REPLY: | |
134 | ct_state |= OVS_CS_F_ESTABLISHED; | |
135 | break; | |
136 | case IP_CT_RELATED: | |
137 | case IP_CT_RELATED_REPLY: | |
138 | ct_state |= OVS_CS_F_RELATED; | |
139 | break; | |
140 | case IP_CT_NEW: | |
7f8a436e JS |
141 | ct_state |= OVS_CS_F_NEW; |
142 | break; | |
143 | default: | |
144 | break; | |
145 | } | |
146 | ||
147 | return ct_state; | |
148 | } | |
149 | ||
0d5cdef8 JS |
150 | static u32 ovs_ct_get_mark(const struct nf_conn *ct) |
151 | { | |
152 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) | |
153 | return ct ? ct->mark : 0; | |
154 | #else | |
155 | return 0; | |
156 | #endif | |
157 | } | |
158 | ||
b87cec38 JR |
159 | /* Guard against conntrack labels max size shrinking below 128 bits. */ |
160 | #if NF_CT_LABELS_MAX_SIZE < 16 | |
161 | #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes | |
162 | #endif | |
163 | ||
33db4125 JS |
164 | static void ovs_ct_get_labels(const struct nf_conn *ct, |
165 | struct ovs_key_ct_labels *labels) | |
c2ac6673 JS |
166 | { |
167 | struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; | |
168 | ||
b87cec38 JR |
169 | if (cl) |
170 | memcpy(labels, cl->bits, OVS_CT_LABELS_LEN); | |
171 | else | |
33db4125 | 172 | memset(labels, 0, OVS_CT_LABELS_LEN); |
c2ac6673 JS |
173 | } |
174 | ||
9dd7f890 JR |
175 | static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key, |
176 | const struct nf_conntrack_tuple *orig, | |
177 | u8 icmp_proto) | |
178 | { | |
316d4d78 | 179 | key->ct_orig_proto = orig->dst.protonum; |
9dd7f890 JR |
180 | if (orig->dst.protonum == icmp_proto) { |
181 | key->ct.orig_tp.src = htons(orig->dst.u.icmp.type); | |
182 | key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code); | |
183 | } else { | |
184 | key->ct.orig_tp.src = orig->src.u.all; | |
185 | key->ct.orig_tp.dst = orig->dst.u.all; | |
186 | } | |
187 | } | |
188 | ||
7f8a436e | 189 | static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, |
182e3042 JS |
190 | const struct nf_conntrack_zone *zone, |
191 | const struct nf_conn *ct) | |
7f8a436e | 192 | { |
316d4d78 JR |
193 | key->ct_state = state; |
194 | key->ct_zone = zone->id; | |
0d5cdef8 | 195 | key->ct.mark = ovs_ct_get_mark(ct); |
33db4125 | 196 | ovs_ct_get_labels(ct, &key->ct.labels); |
9dd7f890 JR |
197 | |
198 | if (ct) { | |
199 | const struct nf_conntrack_tuple *orig; | |
200 | ||
201 | /* Use the master if we have one. */ | |
202 | if (ct->master) | |
203 | ct = ct->master; | |
204 | orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; | |
205 | ||
206 | /* IP version must match with the master connection. */ | |
207 | if (key->eth.type == htons(ETH_P_IP) && | |
208 | nf_ct_l3num(ct) == NFPROTO_IPV4) { | |
209 | key->ipv4.ct_orig.src = orig->src.u3.ip; | |
210 | key->ipv4.ct_orig.dst = orig->dst.u3.ip; | |
211 | __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP); | |
212 | return; | |
213 | } else if (key->eth.type == htons(ETH_P_IPV6) && | |
214 | !sw_flow_key_is_nd(key) && | |
215 | nf_ct_l3num(ct) == NFPROTO_IPV6) { | |
216 | key->ipv6.ct_orig.src = orig->src.u3.in6; | |
217 | key->ipv6.ct_orig.dst = orig->dst.u3.in6; | |
218 | __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP); | |
219 | return; | |
220 | } | |
221 | } | |
316d4d78 | 222 | /* Clear 'ct_orig_proto' to mark the non-existence of conntrack |
9dd7f890 JR |
223 | * original direction key fields. |
224 | */ | |
316d4d78 | 225 | key->ct_orig_proto = 0; |
7f8a436e JS |
226 | } |
227 | ||
5e17da63 | 228 | /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has |
05752523 JR |
229 | * previously sent the packet to conntrack via the ct action. If |
230 | * 'keep_nat_flags' is true, the existing NAT flags retained, else they are | |
231 | * initialized from the connection status. | |
7f8a436e JS |
232 | */ |
233 | static void ovs_ct_update_key(const struct sk_buff *skb, | |
d110986c | 234 | const struct ovs_conntrack_info *info, |
05752523 JR |
235 | struct sw_flow_key *key, bool post_ct, |
236 | bool keep_nat_flags) | |
7f8a436e JS |
237 | { |
238 | const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; | |
239 | enum ip_conntrack_info ctinfo; | |
240 | struct nf_conn *ct; | |
241 | u8 state = 0; | |
242 | ||
243 | ct = nf_ct_get(skb, &ctinfo); | |
244 | if (ct) { | |
245 | state = ovs_ct_get_state(ctinfo); | |
9f13ded8 | 246 | /* All unconfirmed entries are NEW connections. */ |
4f0909ee JS |
247 | if (!nf_ct_is_confirmed(ct)) |
248 | state |= OVS_CS_F_NEW; | |
9f13ded8 JR |
249 | /* OVS persists the related flag for the duration of the |
250 | * connection. | |
251 | */ | |
7f8a436e JS |
252 | if (ct->master) |
253 | state |= OVS_CS_F_RELATED; | |
05752523 | 254 | if (keep_nat_flags) { |
316d4d78 | 255 | state |= key->ct_state & OVS_CS_F_NAT_MASK; |
05752523 JR |
256 | } else { |
257 | if (ct->status & IPS_SRC_NAT) | |
258 | state |= OVS_CS_F_SRC_NAT; | |
259 | if (ct->status & IPS_DST_NAT) | |
260 | state |= OVS_CS_F_DST_NAT; | |
261 | } | |
7f8a436e JS |
262 | zone = nf_ct_zone(ct); |
263 | } else if (post_ct) { | |
264 | state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; | |
d110986c JS |
265 | if (info) |
266 | zone = &info->zone; | |
7f8a436e | 267 | } |
182e3042 | 268 | __ovs_ct_update_key(key, state, zone, ct); |
7f8a436e JS |
269 | } |
270 | ||
9f13ded8 JR |
271 | /* This is called to initialize CT key fields possibly coming in from the local |
272 | * stack. | |
273 | */ | |
7f8a436e JS |
274 | void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) |
275 | { | |
05752523 | 276 | ovs_ct_update_key(skb, NULL, key, false, false); |
7f8a436e JS |
277 | } |
278 | ||
9dd7f890 JR |
279 | #define IN6_ADDR_INITIALIZER(ADDR) \ |
280 | { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \ | |
281 | (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] } | |
282 | ||
283 | int ovs_ct_put_key(const struct sw_flow_key *swkey, | |
284 | const struct sw_flow_key *output, struct sk_buff *skb) | |
7f8a436e | 285 | { |
316d4d78 | 286 | if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state)) |
7f8a436e JS |
287 | return -EMSGSIZE; |
288 | ||
289 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
316d4d78 | 290 | nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone)) |
7f8a436e JS |
291 | return -EMSGSIZE; |
292 | ||
182e3042 | 293 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
9dd7f890 | 294 | nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark)) |
182e3042 JS |
295 | return -EMSGSIZE; |
296 | ||
9723e6ab | 297 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
9dd7f890 JR |
298 | nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels), |
299 | &output->ct.labels)) | |
c2ac6673 JS |
300 | return -EMSGSIZE; |
301 | ||
316d4d78 | 302 | if (swkey->ct_orig_proto) { |
9dd7f890 JR |
303 | if (swkey->eth.type == htons(ETH_P_IP)) { |
304 | struct ovs_key_ct_tuple_ipv4 orig = { | |
305 | output->ipv4.ct_orig.src, | |
306 | output->ipv4.ct_orig.dst, | |
307 | output->ct.orig_tp.src, | |
308 | output->ct.orig_tp.dst, | |
316d4d78 | 309 | output->ct_orig_proto, |
9dd7f890 JR |
310 | }; |
311 | if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, | |
312 | sizeof(orig), &orig)) | |
313 | return -EMSGSIZE; | |
314 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { | |
315 | struct ovs_key_ct_tuple_ipv6 orig = { | |
316 | IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src), | |
317 | IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst), | |
318 | output->ct.orig_tp.src, | |
319 | output->ct.orig_tp.dst, | |
316d4d78 | 320 | output->ct_orig_proto, |
9dd7f890 JR |
321 | }; |
322 | if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, | |
323 | sizeof(orig), &orig)) | |
324 | return -EMSGSIZE; | |
325 | } | |
326 | } | |
327 | ||
182e3042 JS |
328 | return 0; |
329 | } | |
330 | ||
6ffcea79 | 331 | static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key, |
182e3042 JS |
332 | u32 ct_mark, u32 mask) |
333 | { | |
0d5cdef8 | 334 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
182e3042 JS |
335 | u32 new_mark; |
336 | ||
182e3042 JS |
337 | new_mark = ct_mark | (ct->mark & ~(mask)); |
338 | if (ct->mark != new_mark) { | |
339 | ct->mark = new_mark; | |
193e3096 JR |
340 | if (nf_ct_is_confirmed(ct)) |
341 | nf_conntrack_event_cache(IPCT_MARK, ct); | |
182e3042 JS |
342 | key->ct.mark = new_mark; |
343 | } | |
344 | ||
7f8a436e | 345 | return 0; |
0d5cdef8 JS |
346 | #else |
347 | return -ENOTSUPP; | |
348 | #endif | |
7f8a436e JS |
349 | } |
350 | ||
6ffcea79 | 351 | static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct) |
c2ac6673 | 352 | { |
c2ac6673 | 353 | struct nf_conn_labels *cl; |
c2ac6673 JS |
354 | |
355 | cl = nf_ct_labels_find(ct); | |
356 | if (!cl) { | |
357 | nf_ct_labels_ext_add(ct); | |
358 | cl = nf_ct_labels_find(ct); | |
359 | } | |
6ffcea79 JR |
360 | |
361 | return cl; | |
362 | } | |
363 | ||
364 | /* Initialize labels for a new, yet to be committed conntrack entry. Note that | |
365 | * since the new connection is not yet confirmed, and thus no-one else has | |
2317c6b5 | 366 | * access to it's labels, we simply write them over. |
6ffcea79 JR |
367 | */ |
368 | static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key, | |
369 | const struct ovs_key_ct_labels *labels, | |
370 | const struct ovs_key_ct_labels *mask) | |
371 | { | |
09aa98ad JR |
372 | struct nf_conn_labels *cl, *master_cl; |
373 | bool have_mask = labels_nonzero(mask); | |
374 | ||
375 | /* Inherit master's labels to the related connection? */ | |
376 | master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL; | |
377 | ||
378 | if (!master_cl && !have_mask) | |
379 | return 0; /* Nothing to do. */ | |
6ffcea79 JR |
380 | |
381 | cl = ovs_ct_get_conn_labels(ct); | |
b87cec38 | 382 | if (!cl) |
c2ac6673 JS |
383 | return -ENOSPC; |
384 | ||
09aa98ad JR |
385 | /* Inherit the master's labels, if any. */ |
386 | if (master_cl) | |
387 | *cl = *master_cl; | |
388 | ||
389 | if (have_mask) { | |
390 | u32 *dst = (u32 *)cl->bits; | |
391 | int i; | |
392 | ||
393 | for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) | |
394 | dst[i] = (dst[i] & ~mask->ct_labels_32[i]) | | |
395 | (labels->ct_labels_32[i] | |
396 | & mask->ct_labels_32[i]); | |
397 | } | |
193e3096 | 398 | |
2317c6b5 | 399 | /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the |
abd0a4f2 | 400 | * IPCT_LABEL bit is set in the event cache. |
2317c6b5 JR |
401 | */ |
402 | nf_conntrack_event_cache(IPCT_LABEL, ct); | |
403 | ||
6ffcea79 JR |
404 | memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key, | |
410 | const struct ovs_key_ct_labels *labels, | |
411 | const struct ovs_key_ct_labels *mask) | |
412 | { | |
413 | struct nf_conn_labels *cl; | |
414 | int err; | |
415 | ||
416 | cl = ovs_ct_get_conn_labels(ct); | |
417 | if (!cl) | |
418 | return -ENOSPC; | |
419 | ||
420 | err = nf_connlabels_replace(ct, labels->ct_labels_32, | |
421 | mask->ct_labels_32, | |
422 | OVS_CT_LABELS_LEN_32); | |
423 | if (err) | |
424 | return err; | |
425 | ||
426 | memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); | |
c2ac6673 | 427 | |
c2ac6673 JS |
428 | return 0; |
429 | } | |
430 | ||
cae3a262 JS |
431 | /* 'skb' should already be pulled to nh_ofs. */ |
432 | static int ovs_ct_helper(struct sk_buff *skb, u16 proto) | |
433 | { | |
434 | const struct nf_conntrack_helper *helper; | |
435 | const struct nf_conn_help *help; | |
436 | enum ip_conntrack_info ctinfo; | |
437 | unsigned int protoff; | |
438 | struct nf_conn *ct; | |
05752523 | 439 | int err; |
cae3a262 JS |
440 | |
441 | ct = nf_ct_get(skb, &ctinfo); | |
442 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) | |
443 | return NF_ACCEPT; | |
444 | ||
445 | help = nfct_help(ct); | |
446 | if (!help) | |
447 | return NF_ACCEPT; | |
448 | ||
449 | helper = rcu_dereference(help->helper); | |
450 | if (!helper) | |
451 | return NF_ACCEPT; | |
452 | ||
453 | switch (proto) { | |
454 | case NFPROTO_IPV4: | |
455 | protoff = ip_hdrlen(skb); | |
456 | break; | |
457 | case NFPROTO_IPV6: { | |
458 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; | |
459 | __be16 frag_off; | |
cc570605 | 460 | int ofs; |
cae3a262 | 461 | |
cc570605 JS |
462 | ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, |
463 | &frag_off); | |
464 | if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { | |
cae3a262 JS |
465 | pr_debug("proto header not found\n"); |
466 | return NF_ACCEPT; | |
467 | } | |
cc570605 | 468 | protoff = ofs; |
cae3a262 JS |
469 | break; |
470 | } | |
471 | default: | |
472 | WARN_ONCE(1, "helper invoked on non-IP family!"); | |
473 | return NF_DROP; | |
474 | } | |
475 | ||
05752523 JR |
476 | err = helper->help(skb, protoff, ct, ctinfo); |
477 | if (err != NF_ACCEPT) | |
478 | return err; | |
479 | ||
480 | /* Adjust seqs after helper. This is needed due to some helpers (e.g., | |
481 | * FTP with NAT) adusting the TCP payload size when mangling IP | |
482 | * addresses and/or port numbers in the text-based control connection. | |
483 | */ | |
484 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && | |
485 | !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) | |
486 | return NF_DROP; | |
487 | return NF_ACCEPT; | |
cae3a262 JS |
488 | } |
489 | ||
74c16618 JS |
490 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
491 | * value if 'skb' is freed. | |
492 | */ | |
7f8a436e JS |
493 | static int handle_fragments(struct net *net, struct sw_flow_key *key, |
494 | u16 zone, struct sk_buff *skb) | |
495 | { | |
496 | struct ovs_skb_cb ovs_cb = *OVS_CB(skb); | |
daaa7d64 | 497 | int err; |
7f8a436e JS |
498 | |
499 | if (key->eth.type == htons(ETH_P_IP)) { | |
500 | enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; | |
7f8a436e JS |
501 | |
502 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
19bcf9f2 | 503 | err = ip_defrag(net, skb, user); |
7f8a436e JS |
504 | if (err) |
505 | return err; | |
506 | ||
507 | ovs_cb.mru = IPCB(skb)->frag_max_size; | |
7f8a436e | 508 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
74c16618 | 509 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
7f8a436e | 510 | enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; |
7f8a436e JS |
511 | |
512 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); | |
daaa7d64 | 513 | err = nf_ct_frag6_gather(net, skb, user); |
f92a80a9 DDP |
514 | if (err) { |
515 | if (err != -EINPROGRESS) | |
516 | kfree_skb(skb); | |
daaa7d64 | 517 | return err; |
f92a80a9 | 518 | } |
7f8a436e | 519 | |
daaa7d64 | 520 | key->ip.proto = ipv6_hdr(skb)->nexthdr; |
7f8a436e | 521 | ovs_cb.mru = IP6CB(skb)->frag_max_size; |
7f8a436e JS |
522 | #endif |
523 | } else { | |
74c16618 | 524 | kfree_skb(skb); |
7f8a436e JS |
525 | return -EPFNOSUPPORT; |
526 | } | |
527 | ||
ad06a566 GR |
528 | /* The key extracted from the fragment that completed this datagram |
529 | * likely didn't have an L4 header, so regenerate it. | |
530 | */ | |
531 | ovs_flow_key_update_l3l4(skb, key); | |
532 | ||
7f8a436e JS |
533 | key->ip.frag = OVS_FRAG_TYPE_NONE; |
534 | skb_clear_hash(skb); | |
535 | skb->ignore_df = 1; | |
536 | *OVS_CB(skb) = ovs_cb; | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | static struct nf_conntrack_expect * | |
542 | ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, | |
543 | u16 proto, const struct sk_buff *skb) | |
544 | { | |
545 | struct nf_conntrack_tuple tuple; | |
cf5d7091 | 546 | struct nf_conntrack_expect *exp; |
7f8a436e | 547 | |
a31f1adc | 548 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple)) |
7f8a436e | 549 | return NULL; |
cf5d7091 JR |
550 | |
551 | exp = __nf_ct_expect_find(net, zone, &tuple); | |
552 | if (exp) { | |
553 | struct nf_conntrack_tuple_hash *h; | |
554 | ||
555 | /* Delete existing conntrack entry, if it clashes with the | |
556 | * expectation. This can happen since conntrack ALGs do not | |
557 | * check for clashes between (new) expectations and existing | |
558 | * conntrack entries. nf_conntrack_in() will check the | |
559 | * expectations only if a conntrack entry can not be found, | |
560 | * which can lead to OVS finding the expectation (here) in the | |
561 | * init direction, but which will not be removed by the | |
562 | * nf_conntrack_in() call, if a matching conntrack entry is | |
563 | * found instead. In this case all init direction packets | |
564 | * would be reported as new related packets, while reply | |
565 | * direction packets would be reported as un-related | |
566 | * established packets. | |
567 | */ | |
568 | h = nf_conntrack_find_get(net, zone, &tuple); | |
569 | if (h) { | |
570 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
571 | ||
572 | nf_ct_delete(ct, 0, 0); | |
573 | nf_conntrack_put(&ct->ct_general); | |
574 | } | |
575 | } | |
576 | ||
577 | return exp; | |
7f8a436e JS |
578 | } |
579 | ||
289f2253 JR |
580 | /* This replicates logic from nf_conntrack_core.c that is not exported. */ |
581 | static enum ip_conntrack_info | |
582 | ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h) | |
583 | { | |
584 | const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
585 | ||
586 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) | |
587 | return IP_CT_ESTABLISHED_REPLY; | |
588 | /* Once we've had two way comms, always ESTABLISHED. */ | |
589 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) | |
590 | return IP_CT_ESTABLISHED; | |
591 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) | |
592 | return IP_CT_RELATED; | |
593 | return IP_CT_NEW; | |
594 | } | |
595 | ||
596 | /* Find an existing connection which this packet belongs to without | |
597 | * re-attributing statistics or modifying the connection state. This allows an | |
5e17da63 | 598 | * skb->_nfct lost due to an upcall to be recovered during actions execution. |
289f2253 JR |
599 | * |
600 | * Must be called with rcu_read_lock. | |
601 | * | |
5e17da63 JR |
602 | * On success, populates skb->_nfct and returns the connection. Returns NULL |
603 | * if there is no existing entry. | |
289f2253 JR |
604 | */ |
605 | static struct nf_conn * | |
606 | ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone, | |
9ff464db | 607 | u8 l3num, struct sk_buff *skb, bool natted) |
289f2253 | 608 | { |
289f2253 JR |
609 | struct nf_conntrack_tuple tuple; |
610 | struct nf_conntrack_tuple_hash *h; | |
289f2253 | 611 | struct nf_conn *ct; |
289f2253 | 612 | |
60e3be94 FW |
613 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), l3num, |
614 | net, &tuple)) { | |
289f2253 JR |
615 | pr_debug("ovs_ct_find_existing: Can't get tuple\n"); |
616 | return NULL; | |
617 | } | |
618 | ||
9ff464db JR |
619 | /* Must invert the tuple if skb has been transformed by NAT. */ |
620 | if (natted) { | |
621 | struct nf_conntrack_tuple inverse; | |
622 | ||
303e0c55 | 623 | if (!nf_ct_invert_tuple(&inverse, &tuple)) { |
9ff464db JR |
624 | pr_debug("ovs_ct_find_existing: Inversion failed!\n"); |
625 | return NULL; | |
626 | } | |
627 | tuple = inverse; | |
628 | } | |
629 | ||
289f2253 JR |
630 | /* look for tuple match */ |
631 | h = nf_conntrack_find_get(net, zone, &tuple); | |
632 | if (!h) | |
633 | return NULL; /* Not found. */ | |
634 | ||
635 | ct = nf_ct_tuplehash_to_ctrack(h); | |
636 | ||
9ff464db JR |
637 | /* Inverted packet tuple matches the reverse direction conntrack tuple, |
638 | * select the other tuplehash to get the right 'ctinfo' bits for this | |
639 | * packet. | |
640 | */ | |
641 | if (natted) | |
642 | h = &ct->tuplehash[!h->tuple.dst.dir]; | |
643 | ||
c74454fa | 644 | nf_ct_set(skb, ct, ovs_ct_get_info(h)); |
289f2253 JR |
645 | return ct; |
646 | } | |
647 | ||
8b97ac5b GR |
648 | static |
649 | struct nf_conn *ovs_ct_executed(struct net *net, | |
650 | const struct sw_flow_key *key, | |
651 | const struct ovs_conntrack_info *info, | |
652 | struct sk_buff *skb, | |
653 | bool *ct_executed) | |
654 | { | |
655 | struct nf_conn *ct = NULL; | |
656 | ||
657 | /* If no ct, check if we have evidence that an existing conntrack entry | |
658 | * might be found for this skb. This happens when we lose a skb->_nfct | |
659 | * due to an upcall, or if the direction is being forced. If the | |
660 | * connection was not confirmed, it is not cached and needs to be run | |
661 | * through conntrack again. | |
662 | */ | |
663 | *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) && | |
664 | !(key->ct_state & OVS_CS_F_INVALID) && | |
665 | (key->ct_zone == info->zone.id); | |
666 | ||
667 | if (*ct_executed || (!key->ct_state && info->force)) { | |
668 | ct = ovs_ct_find_existing(net, &info->zone, info->family, skb, | |
669 | !!(key->ct_state & | |
670 | OVS_CS_F_NAT_MASK)); | |
671 | } | |
672 | ||
673 | return ct; | |
674 | } | |
675 | ||
5e17da63 | 676 | /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */ |
289f2253 JR |
677 | static bool skb_nfct_cached(struct net *net, |
678 | const struct sw_flow_key *key, | |
679 | const struct ovs_conntrack_info *info, | |
680 | struct sk_buff *skb) | |
7f8a436e JS |
681 | { |
682 | enum ip_conntrack_info ctinfo; | |
683 | struct nf_conn *ct; | |
8b97ac5b | 684 | bool ct_executed = true; |
7f8a436e JS |
685 | |
686 | ct = nf_ct_get(skb, &ctinfo); | |
687 | if (!ct) | |
8b97ac5b GR |
688 | ct = ovs_ct_executed(net, key, info, skb, &ct_executed); |
689 | ||
690 | if (ct) | |
691 | nf_ct_get(skb, &ctinfo); | |
692 | else | |
7f8a436e | 693 | return false; |
8b97ac5b | 694 | |
7f8a436e JS |
695 | if (!net_eq(net, read_pnet(&ct->ct_net))) |
696 | return false; | |
697 | if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) | |
698 | return false; | |
cae3a262 JS |
699 | if (info->helper) { |
700 | struct nf_conn_help *help; | |
701 | ||
702 | help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); | |
703 | if (help && rcu_access_pointer(help->helper) != info->helper) | |
704 | return false; | |
705 | } | |
71778951 YHW |
706 | if (info->nf_ct_timeout) { |
707 | struct nf_conn_timeout *timeout_ext; | |
708 | ||
709 | timeout_ext = nf_ct_timeout_find(ct); | |
710 | if (!timeout_ext || info->nf_ct_timeout != | |
711 | rcu_dereference(timeout_ext->timeout)) | |
712 | return false; | |
713 | } | |
dd41d33f JR |
714 | /* Force conntrack entry direction to the current packet? */ |
715 | if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) { | |
716 | /* Delete the conntrack entry if confirmed, else just release | |
717 | * the reference. | |
718 | */ | |
719 | if (nf_ct_is_confirmed(ct)) | |
720 | nf_ct_delete(ct, 0, 0); | |
b768b16d JR |
721 | |
722 | nf_conntrack_put(&ct->ct_general); | |
dd41d33f JR |
723 | nf_ct_set(skb, NULL, 0); |
724 | return false; | |
725 | } | |
7f8a436e | 726 | |
8b97ac5b | 727 | return ct_executed; |
7f8a436e JS |
728 | } |
729 | ||
4806e975 | 730 | #if IS_ENABLED(CONFIG_NF_NAT) |
05752523 JR |
731 | /* Modelled after nf_nat_ipv[46]_fn(). |
732 | * range is only used for new, uninitialized NAT state. | |
733 | * Returns either NF_ACCEPT or NF_DROP. | |
734 | */ | |
735 | static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct, | |
736 | enum ip_conntrack_info ctinfo, | |
2eb0f624 | 737 | const struct nf_nat_range2 *range, |
05752523 JR |
738 | enum nf_nat_manip_type maniptype) |
739 | { | |
740 | int hooknum, nh_off, err = NF_ACCEPT; | |
741 | ||
742 | nh_off = skb_network_offset(skb); | |
75f01a4c | 743 | skb_pull_rcsum(skb, nh_off); |
05752523 JR |
744 | |
745 | /* See HOOK2MANIP(). */ | |
746 | if (maniptype == NF_NAT_MANIP_SRC) | |
747 | hooknum = NF_INET_LOCAL_IN; /* Source NAT */ | |
748 | else | |
749 | hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */ | |
750 | ||
751 | switch (ctinfo) { | |
752 | case IP_CT_RELATED: | |
753 | case IP_CT_RELATED_REPLY: | |
3bf195ae | 754 | if (IS_ENABLED(CONFIG_NF_NAT) && |
99b7248e | 755 | skb->protocol == htons(ETH_P_IP) && |
05752523 JR |
756 | ip_hdr(skb)->protocol == IPPROTO_ICMP) { |
757 | if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, | |
758 | hooknum)) | |
759 | err = NF_DROP; | |
760 | goto push; | |
3bf195ae | 761 | } else if (IS_ENABLED(CONFIG_IPV6) && |
99b7248e | 762 | skb->protocol == htons(ETH_P_IPV6)) { |
05752523 JR |
763 | __be16 frag_off; |
764 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; | |
765 | int hdrlen = ipv6_skip_exthdr(skb, | |
766 | sizeof(struct ipv6hdr), | |
767 | &nexthdr, &frag_off); | |
768 | ||
769 | if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) { | |
770 | if (!nf_nat_icmpv6_reply_translation(skb, ct, | |
771 | ctinfo, | |
772 | hooknum, | |
773 | hdrlen)) | |
774 | err = NF_DROP; | |
775 | goto push; | |
776 | } | |
05752523 JR |
777 | } |
778 | /* Non-ICMP, fall thru to initialize if needed. */ | |
279badc2 | 779 | /* fall through */ |
05752523 JR |
780 | case IP_CT_NEW: |
781 | /* Seen it before? This can happen for loopback, retrans, | |
782 | * or local packets. | |
783 | */ | |
784 | if (!nf_nat_initialized(ct, maniptype)) { | |
785 | /* Initialize according to the NAT action. */ | |
786 | err = (range && range->flags & NF_NAT_RANGE_MAP_IPS) | |
787 | /* Action is set up to establish a new | |
788 | * mapping. | |
789 | */ | |
790 | ? nf_nat_setup_info(ct, range, maniptype) | |
791 | : nf_nat_alloc_null_binding(ct, hooknum); | |
792 | if (err != NF_ACCEPT) | |
793 | goto push; | |
794 | } | |
795 | break; | |
796 | ||
797 | case IP_CT_ESTABLISHED: | |
798 | case IP_CT_ESTABLISHED_REPLY: | |
799 | break; | |
800 | ||
801 | default: | |
802 | err = NF_DROP; | |
803 | goto push; | |
804 | } | |
805 | ||
806 | err = nf_nat_packet(ct, ctinfo, hooknum, skb); | |
807 | push: | |
808 | skb_push(skb, nh_off); | |
75f01a4c | 809 | skb_postpush_rcsum(skb, skb->data, nh_off); |
05752523 JR |
810 | |
811 | return err; | |
812 | } | |
813 | ||
814 | static void ovs_nat_update_key(struct sw_flow_key *key, | |
815 | const struct sk_buff *skb, | |
816 | enum nf_nat_manip_type maniptype) | |
817 | { | |
818 | if (maniptype == NF_NAT_MANIP_SRC) { | |
819 | __be16 src; | |
820 | ||
316d4d78 | 821 | key->ct_state |= OVS_CS_F_SRC_NAT; |
05752523 JR |
822 | if (key->eth.type == htons(ETH_P_IP)) |
823 | key->ipv4.addr.src = ip_hdr(skb)->saddr; | |
824 | else if (key->eth.type == htons(ETH_P_IPV6)) | |
825 | memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr, | |
826 | sizeof(key->ipv6.addr.src)); | |
827 | else | |
828 | return; | |
829 | ||
830 | if (key->ip.proto == IPPROTO_UDP) | |
831 | src = udp_hdr(skb)->source; | |
832 | else if (key->ip.proto == IPPROTO_TCP) | |
833 | src = tcp_hdr(skb)->source; | |
834 | else if (key->ip.proto == IPPROTO_SCTP) | |
835 | src = sctp_hdr(skb)->source; | |
836 | else | |
837 | return; | |
838 | ||
839 | key->tp.src = src; | |
840 | } else { | |
841 | __be16 dst; | |
842 | ||
316d4d78 | 843 | key->ct_state |= OVS_CS_F_DST_NAT; |
05752523 JR |
844 | if (key->eth.type == htons(ETH_P_IP)) |
845 | key->ipv4.addr.dst = ip_hdr(skb)->daddr; | |
846 | else if (key->eth.type == htons(ETH_P_IPV6)) | |
847 | memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr, | |
848 | sizeof(key->ipv6.addr.dst)); | |
849 | else | |
850 | return; | |
851 | ||
852 | if (key->ip.proto == IPPROTO_UDP) | |
853 | dst = udp_hdr(skb)->dest; | |
854 | else if (key->ip.proto == IPPROTO_TCP) | |
855 | dst = tcp_hdr(skb)->dest; | |
856 | else if (key->ip.proto == IPPROTO_SCTP) | |
857 | dst = sctp_hdr(skb)->dest; | |
858 | else | |
859 | return; | |
860 | ||
861 | key->tp.dst = dst; | |
862 | } | |
863 | } | |
864 | ||
865 | /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */ | |
866 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, | |
867 | const struct ovs_conntrack_info *info, | |
868 | struct sk_buff *skb, struct nf_conn *ct, | |
869 | enum ip_conntrack_info ctinfo) | |
870 | { | |
871 | enum nf_nat_manip_type maniptype; | |
872 | int err; | |
873 | ||
05752523 JR |
874 | /* Add NAT extension if not confirmed yet. */ |
875 | if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct)) | |
876 | return NF_ACCEPT; /* Can't NAT. */ | |
877 | ||
878 | /* Determine NAT type. | |
879 | * Check if the NAT type can be deduced from the tracked connection. | |
5745b0be JR |
880 | * Make sure new expected connections (IP_CT_RELATED) are NATted only |
881 | * when committing. | |
05752523 JR |
882 | */ |
883 | if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW && | |
884 | ct->status & IPS_NAT_MASK && | |
5745b0be | 885 | (ctinfo != IP_CT_RELATED || info->commit)) { |
05752523 JR |
886 | /* NAT an established or related connection like before. */ |
887 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) | |
888 | /* This is the REPLY direction for a connection | |
889 | * for which NAT was applied in the forward | |
890 | * direction. Do the reverse NAT. | |
891 | */ | |
892 | maniptype = ct->status & IPS_SRC_NAT | |
893 | ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC; | |
894 | else | |
895 | maniptype = ct->status & IPS_SRC_NAT | |
896 | ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST; | |
897 | } else if (info->nat & OVS_CT_SRC_NAT) { | |
898 | maniptype = NF_NAT_MANIP_SRC; | |
899 | } else if (info->nat & OVS_CT_DST_NAT) { | |
900 | maniptype = NF_NAT_MANIP_DST; | |
901 | } else { | |
902 | return NF_ACCEPT; /* Connection is not NATed. */ | |
903 | } | |
904 | err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype); | |
905 | ||
906 | /* Mark NAT done if successful and update the flow key. */ | |
907 | if (err == NF_ACCEPT) | |
908 | ovs_nat_update_key(key, skb, maniptype); | |
909 | ||
910 | return err; | |
911 | } | |
4806e975 | 912 | #else /* !CONFIG_NF_NAT */ |
05752523 JR |
913 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, |
914 | const struct ovs_conntrack_info *info, | |
915 | struct sk_buff *skb, struct nf_conn *ct, | |
916 | enum ip_conntrack_info ctinfo) | |
917 | { | |
918 | return NF_ACCEPT; | |
919 | } | |
920 | #endif | |
921 | ||
9f13ded8 | 922 | /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if |
394e910e JR |
923 | * not done already. Update key with new CT state after passing the packet |
924 | * through conntrack. | |
5e17da63 | 925 | * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be |
9f13ded8 JR |
926 | * set to NULL and 0 will be returned. |
927 | */ | |
4f0909ee | 928 | static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, |
7f8a436e JS |
929 | const struct ovs_conntrack_info *info, |
930 | struct sk_buff *skb) | |
931 | { | |
932 | /* If we are recirculating packets to match on conntrack fields and | |
933 | * committing with a separate conntrack action, then we don't need to | |
934 | * actually run the packet through conntrack twice unless it's for a | |
935 | * different zone. | |
936 | */ | |
28b6e0c1 JR |
937 | bool cached = skb_nfct_cached(net, key, info, skb); |
938 | enum ip_conntrack_info ctinfo; | |
939 | struct nf_conn *ct; | |
940 | ||
941 | if (!cached) { | |
93e66024 FW |
942 | struct nf_hook_state state = { |
943 | .hook = NF_INET_PRE_ROUTING, | |
944 | .pf = info->family, | |
945 | .net = net, | |
946 | }; | |
7f8a436e | 947 | struct nf_conn *tmpl = info->ct; |
5b6b9293 | 948 | int err; |
7f8a436e JS |
949 | |
950 | /* Associate skb with specified zone. */ | |
951 | if (tmpl) { | |
cb9c6836 FW |
952 | if (skb_nfct(skb)) |
953 | nf_conntrack_put(skb_nfct(skb)); | |
7f8a436e | 954 | nf_conntrack_get(&tmpl->ct_general); |
c74454fa | 955 | nf_ct_set(skb, tmpl, IP_CT_NEW); |
7f8a436e JS |
956 | } |
957 | ||
93e66024 | 958 | err = nf_conntrack_in(skb, &state); |
5b6b9293 | 959 | if (err != NF_ACCEPT) |
7f8a436e | 960 | return -ENOENT; |
cae3a262 | 961 | |
05752523 JR |
962 | /* Clear CT state NAT flags to mark that we have not yet done |
963 | * NAT after the nf_conntrack_in() call. We can actually clear | |
964 | * the whole state, as it will be re-initialized below. | |
965 | */ | |
316d4d78 | 966 | key->ct_state = 0; |
05752523 JR |
967 | |
968 | /* Update the key, but keep the NAT flags. */ | |
969 | ovs_ct_update_key(skb, info, key, true, true); | |
28b6e0c1 | 970 | } |
394e910e | 971 | |
28b6e0c1 | 972 | ct = nf_ct_get(skb, &ctinfo); |
05752523 JR |
973 | if (ct) { |
974 | /* Packets starting a new connection must be NATted before the | |
975 | * helper, so that the helper knows about the NAT. We enforce | |
976 | * this by delaying both NAT and helper calls for unconfirmed | |
977 | * connections until the committing CT action. For later | |
978 | * packets NAT and Helper may be called in either order. | |
979 | * | |
980 | * NAT will be done only if the CT action has NAT, and only | |
981 | * once per packet (per zone), as guarded by the NAT bits in | |
316d4d78 | 982 | * the key->ct_state. |
05752523 | 983 | */ |
316d4d78 | 984 | if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) && |
05752523 JR |
985 | (nf_ct_is_confirmed(ct) || info->commit) && |
986 | ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) { | |
987 | return -EINVAL; | |
988 | } | |
989 | ||
16ec3d4f JS |
990 | /* Userspace may decide to perform a ct lookup without a helper |
991 | * specified followed by a (recirculate and) commit with one. | |
992 | * Therefore, for unconfirmed connections which we will commit, | |
993 | * we need to attach the helper here. | |
994 | */ | |
995 | if (!nf_ct_is_confirmed(ct) && info->commit && | |
996 | info->helper && !nfct_help(ct)) { | |
997 | int err = __nf_ct_try_assign_helper(ct, info->ct, | |
998 | GFP_ATOMIC); | |
999 | if (err) | |
1000 | return err; | |
fa7e428c FL |
1001 | |
1002 | /* helper installed, add seqadj if NAT is required */ | |
1003 | if (info->nat && !nfct_seqadj(ct)) { | |
1004 | if (!nfct_seqadj_ext_add(ct)) | |
1005 | return -EINVAL; | |
1006 | } | |
16ec3d4f JS |
1007 | } |
1008 | ||
05752523 JR |
1009 | /* Call the helper only if: |
1010 | * - nf_conntrack_in() was executed above ("!cached") for a | |
1011 | * confirmed connection, or | |
1012 | * - When committing an unconfirmed connection. | |
1013 | */ | |
1014 | if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) && | |
1015 | ovs_ct_helper(skb, info->family) != NF_ACCEPT) { | |
1016 | return -EINVAL; | |
1017 | } | |
7f8a436e JS |
1018 | } |
1019 | ||
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | /* Lookup connection and read fields into key. */ | |
1024 | static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, | |
1025 | const struct ovs_conntrack_info *info, | |
1026 | struct sk_buff *skb) | |
1027 | { | |
1028 | struct nf_conntrack_expect *exp; | |
1029 | ||
9f13ded8 JR |
1030 | /* If we pass an expected packet through nf_conntrack_in() the |
1031 | * expectation is typically removed, but the packet could still be | |
1032 | * lost in upcall processing. To prevent this from happening we | |
1033 | * perform an explicit expectation lookup. Expected connections are | |
1034 | * always new, and will be passed through conntrack only when they are | |
1035 | * committed, as it is OK to remove the expectation at that time. | |
1036 | */ | |
7f8a436e JS |
1037 | exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); |
1038 | if (exp) { | |
1039 | u8 state; | |
1040 | ||
05752523 JR |
1041 | /* NOTE: New connections are NATted and Helped only when |
1042 | * committed, so we are not calling into NAT here. | |
1043 | */ | |
7f8a436e | 1044 | state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; |
182e3042 | 1045 | __ovs_ct_update_key(key, state, &info->zone, exp->master); |
d913d3a7 SG |
1046 | } else { |
1047 | struct nf_conn *ct; | |
1048 | int err; | |
1049 | ||
1050 | err = __ovs_ct_lookup(net, key, info, skb); | |
1051 | if (err) | |
1052 | return err; | |
1053 | ||
cb9c6836 | 1054 | ct = (struct nf_conn *)skb_nfct(skb); |
d913d3a7 SG |
1055 | if (ct) |
1056 | nf_ct_deliver_cached_events(ct); | |
1057 | } | |
7f8a436e JS |
1058 | |
1059 | return 0; | |
1060 | } | |
1061 | ||
33db4125 | 1062 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels) |
c2ac6673 JS |
1063 | { |
1064 | size_t i; | |
1065 | ||
cb80d58f JR |
1066 | for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) |
1067 | if (labels->ct_labels_32[i]) | |
c2ac6673 JS |
1068 | return true; |
1069 | ||
1070 | return false; | |
1071 | } | |
1072 | ||
11efd5cb YHW |
1073 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
1074 | static struct hlist_head *ct_limit_hash_bucket( | |
1075 | const struct ovs_ct_limit_info *info, u16 zone) | |
1076 | { | |
1077 | return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)]; | |
1078 | } | |
1079 | ||
1080 | /* Call with ovs_mutex */ | |
1081 | static void ct_limit_set(const struct ovs_ct_limit_info *info, | |
1082 | struct ovs_ct_limit *new_ct_limit) | |
1083 | { | |
1084 | struct ovs_ct_limit *ct_limit; | |
1085 | struct hlist_head *head; | |
1086 | ||
1087 | head = ct_limit_hash_bucket(info, new_ct_limit->zone); | |
1088 | hlist_for_each_entry_rcu(ct_limit, head, hlist_node) { | |
1089 | if (ct_limit->zone == new_ct_limit->zone) { | |
1090 | hlist_replace_rcu(&ct_limit->hlist_node, | |
1091 | &new_ct_limit->hlist_node); | |
1092 | kfree_rcu(ct_limit, rcu); | |
1093 | return; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | hlist_add_head_rcu(&new_ct_limit->hlist_node, head); | |
1098 | } | |
1099 | ||
1100 | /* Call with ovs_mutex */ | |
1101 | static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone) | |
1102 | { | |
1103 | struct ovs_ct_limit *ct_limit; | |
1104 | struct hlist_head *head; | |
1105 | struct hlist_node *n; | |
1106 | ||
1107 | head = ct_limit_hash_bucket(info, zone); | |
1108 | hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) { | |
1109 | if (ct_limit->zone == zone) { | |
1110 | hlist_del_rcu(&ct_limit->hlist_node); | |
1111 | kfree_rcu(ct_limit, rcu); | |
1112 | return; | |
1113 | } | |
1114 | } | |
1115 | } | |
1116 | ||
1117 | /* Call with RCU read lock */ | |
1118 | static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone) | |
1119 | { | |
1120 | struct ovs_ct_limit *ct_limit; | |
1121 | struct hlist_head *head; | |
1122 | ||
1123 | head = ct_limit_hash_bucket(info, zone); | |
1124 | hlist_for_each_entry_rcu(ct_limit, head, hlist_node) { | |
1125 | if (ct_limit->zone == zone) | |
1126 | return ct_limit->limit; | |
1127 | } | |
1128 | ||
1129 | return info->default_limit; | |
1130 | } | |
1131 | ||
1132 | static int ovs_ct_check_limit(struct net *net, | |
1133 | const struct ovs_conntrack_info *info, | |
1134 | const struct nf_conntrack_tuple *tuple) | |
1135 | { | |
1136 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
1137 | const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; | |
1138 | u32 per_zone_limit, connections; | |
1139 | u32 conncount_key; | |
1140 | ||
1141 | conncount_key = info->zone.id; | |
1142 | ||
1143 | per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id); | |
1144 | if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED) | |
1145 | return 0; | |
1146 | ||
1147 | connections = nf_conncount_count(net, ct_limit_info->data, | |
1148 | &conncount_key, tuple, &info->zone); | |
1149 | if (connections > per_zone_limit) | |
1150 | return -ENOMEM; | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | #endif | |
1155 | ||
7d904c7b JR |
1156 | /* Lookup connection and confirm if unconfirmed. */ |
1157 | static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, | |
1158 | const struct ovs_conntrack_info *info, | |
1159 | struct sk_buff *skb) | |
1160 | { | |
6ffcea79 JR |
1161 | enum ip_conntrack_info ctinfo; |
1162 | struct nf_conn *ct; | |
7d904c7b JR |
1163 | int err; |
1164 | ||
1165 | err = __ovs_ct_lookup(net, key, info, skb); | |
1166 | if (err) | |
1167 | return err; | |
1168 | ||
6ffcea79 JR |
1169 | /* The connection could be invalid, in which case this is a no-op.*/ |
1170 | ct = nf_ct_get(skb, &ctinfo); | |
1171 | if (!ct) | |
1172 | return 0; | |
1173 | ||
11efd5cb YHW |
1174 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
1175 | if (static_branch_unlikely(&ovs_ct_limit_enabled)) { | |
1176 | if (!nf_ct_is_confirmed(ct)) { | |
1177 | err = ovs_ct_check_limit(net, info, | |
1178 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); | |
1179 | if (err) { | |
1180 | net_warn_ratelimited("openvswitch: zone: %u " | |
43d0e960 | 1181 | "exceeds conntrack limit\n", |
11efd5cb YHW |
1182 | info->zone.id); |
1183 | return err; | |
1184 | } | |
1185 | } | |
1186 | } | |
1187 | #endif | |
1188 | ||
12064551 JR |
1189 | /* Set the conntrack event mask if given. NEW and DELETE events have |
1190 | * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener | |
1191 | * typically would receive many kinds of updates. Setting the event | |
1192 | * mask allows those events to be filtered. The set event mask will | |
1193 | * remain in effect for the lifetime of the connection unless changed | |
1194 | * by a further CT action with both the commit flag and the eventmask | |
1195 | * option. */ | |
1196 | if (info->have_eventmask) { | |
1197 | struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct); | |
1198 | ||
1199 | if (cache) | |
1200 | cache->ctmask = info->eventmask; | |
1201 | } | |
1202 | ||
7d904c7b JR |
1203 | /* Apply changes before confirming the connection so that the initial |
1204 | * conntrack NEW netlink event carries the values given in the CT | |
1205 | * action. | |
1206 | */ | |
1207 | if (info->mark.mask) { | |
6ffcea79 | 1208 | err = ovs_ct_set_mark(ct, key, info->mark.value, |
7d904c7b JR |
1209 | info->mark.mask); |
1210 | if (err) | |
1211 | return err; | |
1212 | } | |
09aa98ad JR |
1213 | if (!nf_ct_is_confirmed(ct)) { |
1214 | err = ovs_ct_init_labels(ct, key, &info->labels.value, | |
1215 | &info->labels.mask); | |
1216 | if (err) | |
1217 | return err; | |
a277d516 AB |
1218 | } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
1219 | labels_nonzero(&info->labels.mask)) { | |
09aa98ad JR |
1220 | err = ovs_ct_set_labels(ct, key, &info->labels.value, |
1221 | &info->labels.mask); | |
7d904c7b JR |
1222 | if (err) |
1223 | return err; | |
1224 | } | |
1225 | /* This will take care of sending queued events even if the connection | |
1226 | * is already confirmed. | |
1227 | */ | |
1228 | if (nf_conntrack_confirm(skb) != NF_ACCEPT) | |
1229 | return -EINVAL; | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
9382fe71 ES |
1234 | /* Trim the skb to the length specified by the IP/IPv6 header, |
1235 | * removing any trailing lower-layer padding. This prepares the skb | |
1236 | * for higher-layer processing that assumes skb->len excludes padding | |
1237 | * (such as nf_ip_checksum). The caller needs to pull the skb to the | |
1238 | * network header, and ensure ip_hdr/ipv6_hdr points to valid data. | |
1239 | */ | |
1240 | static int ovs_skb_network_trim(struct sk_buff *skb) | |
1241 | { | |
1242 | unsigned int len; | |
1243 | int err; | |
1244 | ||
1245 | switch (skb->protocol) { | |
1246 | case htons(ETH_P_IP): | |
1247 | len = ntohs(ip_hdr(skb)->tot_len); | |
1248 | break; | |
1249 | case htons(ETH_P_IPV6): | |
1250 | len = sizeof(struct ipv6hdr) | |
1251 | + ntohs(ipv6_hdr(skb)->payload_len); | |
1252 | break; | |
1253 | default: | |
1254 | len = skb->len; | |
1255 | } | |
1256 | ||
1257 | err = pskb_trim_rcsum(skb, len); | |
1258 | if (err) | |
1259 | kfree_skb(skb); | |
1260 | ||
1261 | return err; | |
1262 | } | |
1263 | ||
74c16618 JS |
1264 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
1265 | * value if 'skb' is freed. | |
1266 | */ | |
7f8a436e JS |
1267 | int ovs_ct_execute(struct net *net, struct sk_buff *skb, |
1268 | struct sw_flow_key *key, | |
1269 | const struct ovs_conntrack_info *info) | |
1270 | { | |
1271 | int nh_ofs; | |
1272 | int err; | |
1273 | ||
1274 | /* The conntrack module expects to be working at L3. */ | |
1275 | nh_ofs = skb_network_offset(skb); | |
75f01a4c | 1276 | skb_pull_rcsum(skb, nh_ofs); |
7f8a436e | 1277 | |
9382fe71 ES |
1278 | err = ovs_skb_network_trim(skb); |
1279 | if (err) | |
1280 | return err; | |
1281 | ||
7f8a436e JS |
1282 | if (key->ip.frag != OVS_FRAG_TYPE_NONE) { |
1283 | err = handle_fragments(net, key, info->zone.id, skb); | |
1284 | if (err) | |
1285 | return err; | |
1286 | } | |
1287 | ||
ab38a7b5 | 1288 | if (info->commit) |
7d904c7b | 1289 | err = ovs_ct_commit(net, key, info, skb); |
7f8a436e JS |
1290 | else |
1291 | err = ovs_ct_lookup(net, key, info, skb); | |
1292 | ||
1293 | skb_push(skb, nh_ofs); | |
75f01a4c | 1294 | skb_postpush_rcsum(skb, skb->data, nh_ofs); |
74c16618 JS |
1295 | if (err) |
1296 | kfree_skb(skb); | |
7f8a436e JS |
1297 | return err; |
1298 | } | |
1299 | ||
b8226962 EG |
1300 | int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key) |
1301 | { | |
1302 | if (skb_nfct(skb)) { | |
1303 | nf_conntrack_put(skb_nfct(skb)); | |
1304 | nf_ct_set(skb, NULL, IP_CT_UNTRACKED); | |
1305 | ovs_ct_fill_key(skb, key); | |
1306 | } | |
1307 | ||
1308 | return 0; | |
1309 | } | |
1310 | ||
cae3a262 JS |
1311 | static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, |
1312 | const struct sw_flow_key *key, bool log) | |
1313 | { | |
1314 | struct nf_conntrack_helper *helper; | |
1315 | struct nf_conn_help *help; | |
fec9c271 | 1316 | int ret = 0; |
cae3a262 JS |
1317 | |
1318 | helper = nf_conntrack_helper_try_module_get(name, info->family, | |
1319 | key->ip.proto); | |
1320 | if (!helper) { | |
1321 | OVS_NLERR(log, "Unknown helper \"%s\"", name); | |
1322 | return -EINVAL; | |
1323 | } | |
1324 | ||
440534d3 | 1325 | help = nf_ct_helper_ext_add(info->ct, GFP_KERNEL); |
cae3a262 | 1326 | if (!help) { |
d91fc59c | 1327 | nf_conntrack_helper_put(helper); |
cae3a262 JS |
1328 | return -ENOMEM; |
1329 | } | |
1330 | ||
f319ca65 | 1331 | #if IS_ENABLED(CONFIG_NF_NAT) |
fec9c271 FL |
1332 | if (info->nat) { |
1333 | ret = nf_nat_helper_try_module_get(name, info->family, | |
1334 | key->ip.proto); | |
1335 | if (ret) { | |
1336 | nf_conntrack_helper_put(helper); | |
1337 | OVS_NLERR(log, "Failed to load \"%s\" NAT helper, error: %d", | |
1338 | name, ret); | |
1339 | return ret; | |
1340 | } | |
1341 | } | |
1342 | #endif | |
cae3a262 JS |
1343 | rcu_assign_pointer(help->helper, helper); |
1344 | info->helper = helper; | |
fec9c271 | 1345 | return ret; |
cae3a262 JS |
1346 | } |
1347 | ||
4806e975 | 1348 | #if IS_ENABLED(CONFIG_NF_NAT) |
05752523 JR |
1349 | static int parse_nat(const struct nlattr *attr, |
1350 | struct ovs_conntrack_info *info, bool log) | |
1351 | { | |
1352 | struct nlattr *a; | |
1353 | int rem; | |
1354 | bool have_ip_max = false; | |
1355 | bool have_proto_max = false; | |
1356 | bool ip_vers = (info->family == NFPROTO_IPV6); | |
1357 | ||
1358 | nla_for_each_nested(a, attr, rem) { | |
1359 | static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = { | |
1360 | [OVS_NAT_ATTR_SRC] = {0, 0}, | |
1361 | [OVS_NAT_ATTR_DST] = {0, 0}, | |
1362 | [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr), | |
1363 | sizeof(struct in6_addr)}, | |
1364 | [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr), | |
1365 | sizeof(struct in6_addr)}, | |
1366 | [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)}, | |
1367 | [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)}, | |
1368 | [OVS_NAT_ATTR_PERSISTENT] = {0, 0}, | |
1369 | [OVS_NAT_ATTR_PROTO_HASH] = {0, 0}, | |
1370 | [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0}, | |
1371 | }; | |
1372 | int type = nla_type(a); | |
1373 | ||
1374 | if (type > OVS_NAT_ATTR_MAX) { | |
0ed80da5 | 1375 | OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)", |
05752523 JR |
1376 | type, OVS_NAT_ATTR_MAX); |
1377 | return -EINVAL; | |
1378 | } | |
1379 | ||
1380 | if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) { | |
0ed80da5 | 1381 | OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)", |
05752523 JR |
1382 | type, nla_len(a), |
1383 | ovs_nat_attr_lens[type][ip_vers]); | |
1384 | return -EINVAL; | |
1385 | } | |
1386 | ||
1387 | switch (type) { | |
1388 | case OVS_NAT_ATTR_SRC: | |
1389 | case OVS_NAT_ATTR_DST: | |
1390 | if (info->nat) { | |
0ed80da5 | 1391 | OVS_NLERR(log, "Only one type of NAT may be specified"); |
05752523 JR |
1392 | return -ERANGE; |
1393 | } | |
1394 | info->nat |= OVS_CT_NAT; | |
1395 | info->nat |= ((type == OVS_NAT_ATTR_SRC) | |
1396 | ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT); | |
1397 | break; | |
1398 | ||
1399 | case OVS_NAT_ATTR_IP_MIN: | |
ac71b46e HY |
1400 | nla_memcpy(&info->range.min_addr, a, |
1401 | sizeof(info->range.min_addr)); | |
05752523 JR |
1402 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; |
1403 | break; | |
1404 | ||
1405 | case OVS_NAT_ATTR_IP_MAX: | |
1406 | have_ip_max = true; | |
1407 | nla_memcpy(&info->range.max_addr, a, | |
1408 | sizeof(info->range.max_addr)); | |
1409 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; | |
1410 | break; | |
1411 | ||
1412 | case OVS_NAT_ATTR_PROTO_MIN: | |
1413 | info->range.min_proto.all = htons(nla_get_u16(a)); | |
1414 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; | |
1415 | break; | |
1416 | ||
1417 | case OVS_NAT_ATTR_PROTO_MAX: | |
1418 | have_proto_max = true; | |
1419 | info->range.max_proto.all = htons(nla_get_u16(a)); | |
1420 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; | |
1421 | break; | |
1422 | ||
1423 | case OVS_NAT_ATTR_PERSISTENT: | |
1424 | info->range.flags |= NF_NAT_RANGE_PERSISTENT; | |
1425 | break; | |
1426 | ||
1427 | case OVS_NAT_ATTR_PROTO_HASH: | |
1428 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM; | |
1429 | break; | |
1430 | ||
1431 | case OVS_NAT_ATTR_PROTO_RANDOM: | |
1432 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; | |
1433 | break; | |
1434 | ||
1435 | default: | |
0ed80da5 | 1436 | OVS_NLERR(log, "Unknown nat attribute (%d)", type); |
05752523 JR |
1437 | return -EINVAL; |
1438 | } | |
1439 | } | |
1440 | ||
1441 | if (rem > 0) { | |
0ed80da5 | 1442 | OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem); |
05752523 JR |
1443 | return -EINVAL; |
1444 | } | |
1445 | if (!info->nat) { | |
1446 | /* Do not allow flags if no type is given. */ | |
1447 | if (info->range.flags) { | |
1448 | OVS_NLERR(log, | |
e0b10844 | 1449 | "NAT flags may be given only when NAT range (SRC or DST) is also specified." |
05752523 JR |
1450 | ); |
1451 | return -EINVAL; | |
1452 | } | |
1453 | info->nat = OVS_CT_NAT; /* NAT existing connections. */ | |
1454 | } else if (!info->commit) { | |
1455 | OVS_NLERR(log, | |
e0b10844 | 1456 | "NAT attributes may be specified only when CT COMMIT flag is also specified." |
05752523 JR |
1457 | ); |
1458 | return -EINVAL; | |
1459 | } | |
1460 | /* Allow missing IP_MAX. */ | |
1461 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) { | |
1462 | memcpy(&info->range.max_addr, &info->range.min_addr, | |
1463 | sizeof(info->range.max_addr)); | |
1464 | } | |
1465 | /* Allow missing PROTO_MAX. */ | |
1466 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && | |
1467 | !have_proto_max) { | |
1468 | info->range.max_proto.all = info->range.min_proto.all; | |
1469 | } | |
1470 | return 0; | |
1471 | } | |
1472 | #endif | |
1473 | ||
7f8a436e | 1474 | static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { |
ab38a7b5 | 1475 | [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
dd41d33f | 1476 | [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
7f8a436e JS |
1477 | [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), |
1478 | .maxlen = sizeof(u16) }, | |
182e3042 JS |
1479 | [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), |
1480 | .maxlen = sizeof(struct md_mark) }, | |
33db4125 JS |
1481 | [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), |
1482 | .maxlen = sizeof(struct md_labels) }, | |
cae3a262 | 1483 | [OVS_CT_ATTR_HELPER] = { .minlen = 1, |
05752523 | 1484 | .maxlen = NF_CT_HELPER_NAME_LEN }, |
4806e975 | 1485 | #if IS_ENABLED(CONFIG_NF_NAT) |
05752523 JR |
1486 | /* NAT length is checked when parsing the nested attributes. */ |
1487 | [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX }, | |
1488 | #endif | |
12064551 JR |
1489 | [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32), |
1490 | .maxlen = sizeof(u32) }, | |
06bd2bdf YHW |
1491 | [OVS_CT_ATTR_TIMEOUT] = { .minlen = 1, |
1492 | .maxlen = CTNL_TIMEOUT_NAME_MAX }, | |
7f8a436e JS |
1493 | }; |
1494 | ||
1495 | static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, | |
cae3a262 | 1496 | const char **helper, bool log) |
7f8a436e JS |
1497 | { |
1498 | struct nlattr *a; | |
1499 | int rem; | |
1500 | ||
1501 | nla_for_each_nested(a, attr, rem) { | |
1502 | int type = nla_type(a); | |
69ec932e LZ |
1503 | int maxlen; |
1504 | int minlen; | |
7f8a436e JS |
1505 | |
1506 | if (type > OVS_CT_ATTR_MAX) { | |
1507 | OVS_NLERR(log, | |
1508 | "Unknown conntrack attr (type=%d, max=%d)", | |
1509 | type, OVS_CT_ATTR_MAX); | |
1510 | return -EINVAL; | |
1511 | } | |
69ec932e LZ |
1512 | |
1513 | maxlen = ovs_ct_attr_lens[type].maxlen; | |
1514 | minlen = ovs_ct_attr_lens[type].minlen; | |
7f8a436e JS |
1515 | if (nla_len(a) < minlen || nla_len(a) > maxlen) { |
1516 | OVS_NLERR(log, | |
1517 | "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", | |
1518 | type, nla_len(a), maxlen); | |
1519 | return -EINVAL; | |
1520 | } | |
1521 | ||
1522 | switch (type) { | |
dd41d33f JR |
1523 | case OVS_CT_ATTR_FORCE_COMMIT: |
1524 | info->force = true; | |
1525 | /* fall through. */ | |
ab38a7b5 JS |
1526 | case OVS_CT_ATTR_COMMIT: |
1527 | info->commit = true; | |
7f8a436e JS |
1528 | break; |
1529 | #ifdef CONFIG_NF_CONNTRACK_ZONES | |
1530 | case OVS_CT_ATTR_ZONE: | |
1531 | info->zone.id = nla_get_u16(a); | |
1532 | break; | |
182e3042 JS |
1533 | #endif |
1534 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
1535 | case OVS_CT_ATTR_MARK: { | |
1536 | struct md_mark *mark = nla_data(a); | |
1537 | ||
e754ec69 JS |
1538 | if (!mark->mask) { |
1539 | OVS_NLERR(log, "ct_mark mask cannot be 0"); | |
1540 | return -EINVAL; | |
1541 | } | |
182e3042 JS |
1542 | info->mark = *mark; |
1543 | break; | |
1544 | } | |
c2ac6673 JS |
1545 | #endif |
1546 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
33db4125 JS |
1547 | case OVS_CT_ATTR_LABELS: { |
1548 | struct md_labels *labels = nla_data(a); | |
c2ac6673 | 1549 | |
e754ec69 JS |
1550 | if (!labels_nonzero(&labels->mask)) { |
1551 | OVS_NLERR(log, "ct_labels mask cannot be 0"); | |
1552 | return -EINVAL; | |
1553 | } | |
33db4125 | 1554 | info->labels = *labels; |
c2ac6673 JS |
1555 | break; |
1556 | } | |
7f8a436e | 1557 | #endif |
cae3a262 JS |
1558 | case OVS_CT_ATTR_HELPER: |
1559 | *helper = nla_data(a); | |
1560 | if (!memchr(*helper, '\0', nla_len(a))) { | |
1561 | OVS_NLERR(log, "Invalid conntrack helper"); | |
1562 | return -EINVAL; | |
1563 | } | |
1564 | break; | |
4806e975 | 1565 | #if IS_ENABLED(CONFIG_NF_NAT) |
05752523 JR |
1566 | case OVS_CT_ATTR_NAT: { |
1567 | int err = parse_nat(a, info, log); | |
1568 | ||
1569 | if (err) | |
1570 | return err; | |
1571 | break; | |
1572 | } | |
1573 | #endif | |
12064551 JR |
1574 | case OVS_CT_ATTR_EVENTMASK: |
1575 | info->have_eventmask = true; | |
1576 | info->eventmask = nla_get_u32(a); | |
1577 | break; | |
06bd2bdf YHW |
1578 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
1579 | case OVS_CT_ATTR_TIMEOUT: | |
1580 | memcpy(info->timeout, nla_data(a), nla_len(a)); | |
1581 | if (!memchr(info->timeout, '\0', nla_len(a))) { | |
12c6bc38 | 1582 | OVS_NLERR(log, "Invalid conntrack timeout"); |
06bd2bdf YHW |
1583 | return -EINVAL; |
1584 | } | |
1585 | break; | |
1586 | #endif | |
12064551 | 1587 | |
7f8a436e JS |
1588 | default: |
1589 | OVS_NLERR(log, "Unknown conntrack attr (%d)", | |
1590 | type); | |
1591 | return -EINVAL; | |
1592 | } | |
1593 | } | |
1594 | ||
7d904c7b JR |
1595 | #ifdef CONFIG_NF_CONNTRACK_MARK |
1596 | if (!info->commit && info->mark.mask) { | |
1597 | OVS_NLERR(log, | |
1598 | "Setting conntrack mark requires 'commit' flag."); | |
1599 | return -EINVAL; | |
1600 | } | |
1601 | #endif | |
1602 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
1603 | if (!info->commit && labels_nonzero(&info->labels.mask)) { | |
1604 | OVS_NLERR(log, | |
1605 | "Setting conntrack labels requires 'commit' flag."); | |
1606 | return -EINVAL; | |
1607 | } | |
1608 | #endif | |
7f8a436e JS |
1609 | if (rem > 0) { |
1610 | OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); | |
1611 | return -EINVAL; | |
1612 | } | |
1613 | ||
1614 | return 0; | |
1615 | } | |
1616 | ||
c2ac6673 | 1617 | bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) |
7f8a436e JS |
1618 | { |
1619 | if (attr == OVS_KEY_ATTR_CT_STATE) | |
1620 | return true; | |
1621 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
1622 | attr == OVS_KEY_ATTR_CT_ZONE) | |
1623 | return true; | |
182e3042 JS |
1624 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
1625 | attr == OVS_KEY_ATTR_CT_MARK) | |
1626 | return true; | |
c2ac6673 | 1627 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
33db4125 | 1628 | attr == OVS_KEY_ATTR_CT_LABELS) { |
c2ac6673 JS |
1629 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
1630 | ||
1631 | return ovs_net->xt_label; | |
1632 | } | |
7f8a436e JS |
1633 | |
1634 | return false; | |
1635 | } | |
1636 | ||
1637 | int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, | |
1638 | const struct sw_flow_key *key, | |
1639 | struct sw_flow_actions **sfa, bool log) | |
1640 | { | |
1641 | struct ovs_conntrack_info ct_info; | |
cae3a262 | 1642 | const char *helper = NULL; |
7f8a436e JS |
1643 | u16 family; |
1644 | int err; | |
1645 | ||
1646 | family = key_to_nfproto(key); | |
1647 | if (family == NFPROTO_UNSPEC) { | |
1648 | OVS_NLERR(log, "ct family unspecified"); | |
1649 | return -EINVAL; | |
1650 | } | |
1651 | ||
1652 | memset(&ct_info, 0, sizeof(ct_info)); | |
1653 | ct_info.family = family; | |
1654 | ||
1655 | nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, | |
1656 | NF_CT_DEFAULT_ZONE_DIR, 0); | |
1657 | ||
cae3a262 | 1658 | err = parse_ct(attr, &ct_info, &helper, log); |
7f8a436e JS |
1659 | if (err) |
1660 | return err; | |
1661 | ||
1662 | /* Set up template for tracking connections in specific zones. */ | |
1663 | ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); | |
1664 | if (!ct_info.ct) { | |
1665 | OVS_NLERR(log, "Failed to allocate conntrack template"); | |
1666 | return -ENOMEM; | |
1667 | } | |
06bd2bdf YHW |
1668 | |
1669 | if (ct_info.timeout[0]) { | |
1670 | if (nf_ct_set_timeout(net, ct_info.ct, family, key->ip.proto, | |
1671 | ct_info.timeout)) | |
1672 | pr_info_ratelimited("Failed to associated timeout " | |
1673 | "policy `%s'\n", ct_info.timeout); | |
71778951 YHW |
1674 | else |
1675 | ct_info.nf_ct_timeout = rcu_dereference( | |
1676 | nf_ct_timeout_find(ct_info.ct)->timeout); | |
1677 | ||
06bd2bdf YHW |
1678 | } |
1679 | ||
cae3a262 JS |
1680 | if (helper) { |
1681 | err = ovs_ct_add_helper(&ct_info, helper, key, log); | |
1682 | if (err) | |
1683 | goto err_free_ct; | |
1684 | } | |
7f8a436e JS |
1685 | |
1686 | err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, | |
1687 | sizeof(ct_info), log); | |
1688 | if (err) | |
1689 | goto err_free_ct; | |
1690 | ||
7f6d6558 FL |
1691 | __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); |
1692 | nf_conntrack_get(&ct_info.ct->ct_general); | |
7f8a436e JS |
1693 | return 0; |
1694 | err_free_ct: | |
2f3ab9f9 | 1695 | __ovs_ct_free_action(&ct_info); |
7f8a436e JS |
1696 | return err; |
1697 | } | |
1698 | ||
4806e975 | 1699 | #if IS_ENABLED(CONFIG_NF_NAT) |
05752523 JR |
1700 | static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info, |
1701 | struct sk_buff *skb) | |
1702 | { | |
1703 | struct nlattr *start; | |
1704 | ||
ae0be8de | 1705 | start = nla_nest_start_noflag(skb, OVS_CT_ATTR_NAT); |
05752523 JR |
1706 | if (!start) |
1707 | return false; | |
1708 | ||
1709 | if (info->nat & OVS_CT_SRC_NAT) { | |
1710 | if (nla_put_flag(skb, OVS_NAT_ATTR_SRC)) | |
1711 | return false; | |
1712 | } else if (info->nat & OVS_CT_DST_NAT) { | |
1713 | if (nla_put_flag(skb, OVS_NAT_ATTR_DST)) | |
1714 | return false; | |
1715 | } else { | |
1716 | goto out; | |
1717 | } | |
1718 | ||
1719 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS) { | |
3bf195ae | 1720 | if (IS_ENABLED(CONFIG_NF_NAT) && |
99b7248e | 1721 | info->family == NFPROTO_IPV4) { |
05752523 JR |
1722 | if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN, |
1723 | info->range.min_addr.ip) || | |
1724 | (info->range.max_addr.ip | |
1725 | != info->range.min_addr.ip && | |
1726 | (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX, | |
1727 | info->range.max_addr.ip)))) | |
1728 | return false; | |
3bf195ae | 1729 | } else if (IS_ENABLED(CONFIG_IPV6) && |
99b7248e | 1730 | info->family == NFPROTO_IPV6) { |
05752523 JR |
1731 | if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN, |
1732 | &info->range.min_addr.in6) || | |
1733 | (memcmp(&info->range.max_addr.in6, | |
1734 | &info->range.min_addr.in6, | |
1735 | sizeof(info->range.max_addr.in6)) && | |
1736 | (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX, | |
1737 | &info->range.max_addr.in6)))) | |
1738 | return false; | |
05752523 JR |
1739 | } else { |
1740 | return false; | |
1741 | } | |
1742 | } | |
1743 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && | |
1744 | (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN, | |
1745 | ntohs(info->range.min_proto.all)) || | |
1746 | (info->range.max_proto.all != info->range.min_proto.all && | |
1747 | nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX, | |
1748 | ntohs(info->range.max_proto.all))))) | |
1749 | return false; | |
1750 | ||
1751 | if (info->range.flags & NF_NAT_RANGE_PERSISTENT && | |
1752 | nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT)) | |
1753 | return false; | |
1754 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM && | |
1755 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH)) | |
1756 | return false; | |
1757 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY && | |
1758 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM)) | |
1759 | return false; | |
1760 | out: | |
1761 | nla_nest_end(skb, start); | |
1762 | ||
1763 | return true; | |
1764 | } | |
1765 | #endif | |
1766 | ||
7f8a436e JS |
1767 | int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, |
1768 | struct sk_buff *skb) | |
1769 | { | |
1770 | struct nlattr *start; | |
1771 | ||
ae0be8de | 1772 | start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CT); |
7f8a436e JS |
1773 | if (!start) |
1774 | return -EMSGSIZE; | |
1775 | ||
dd41d33f JR |
1776 | if (ct_info->commit && nla_put_flag(skb, ct_info->force |
1777 | ? OVS_CT_ATTR_FORCE_COMMIT | |
1778 | : OVS_CT_ATTR_COMMIT)) | |
7f8a436e JS |
1779 | return -EMSGSIZE; |
1780 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && | |
1781 | nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) | |
1782 | return -EMSGSIZE; | |
e754ec69 | 1783 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && |
182e3042 JS |
1784 | nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), |
1785 | &ct_info->mark)) | |
1786 | return -EMSGSIZE; | |
c2ac6673 | 1787 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
e754ec69 | 1788 | labels_nonzero(&ct_info->labels.mask) && |
33db4125 JS |
1789 | nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), |
1790 | &ct_info->labels)) | |
c2ac6673 | 1791 | return -EMSGSIZE; |
cae3a262 JS |
1792 | if (ct_info->helper) { |
1793 | if (nla_put_string(skb, OVS_CT_ATTR_HELPER, | |
1794 | ct_info->helper->name)) | |
1795 | return -EMSGSIZE; | |
1796 | } | |
12064551 JR |
1797 | if (ct_info->have_eventmask && |
1798 | nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask)) | |
1799 | return -EMSGSIZE; | |
06bd2bdf YHW |
1800 | if (ct_info->timeout[0]) { |
1801 | if (nla_put_string(skb, OVS_CT_ATTR_TIMEOUT, ct_info->timeout)) | |
1802 | return -EMSGSIZE; | |
1803 | } | |
12064551 | 1804 | |
4806e975 | 1805 | #if IS_ENABLED(CONFIG_NF_NAT) |
05752523 JR |
1806 | if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb)) |
1807 | return -EMSGSIZE; | |
1808 | #endif | |
7f8a436e JS |
1809 | nla_nest_end(skb, start); |
1810 | ||
1811 | return 0; | |
1812 | } | |
1813 | ||
1814 | void ovs_ct_free_action(const struct nlattr *a) | |
1815 | { | |
1816 | struct ovs_conntrack_info *ct_info = nla_data(a); | |
1817 | ||
2f3ab9f9 JS |
1818 | __ovs_ct_free_action(ct_info); |
1819 | } | |
1820 | ||
1821 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info) | |
1822 | { | |
fec9c271 | 1823 | if (ct_info->helper) { |
f319ca65 | 1824 | #if IS_ENABLED(CONFIG_NF_NAT) |
fec9c271 FL |
1825 | if (ct_info->nat) |
1826 | nf_nat_helper_put(ct_info->helper); | |
1827 | #endif | |
d91fc59c | 1828 | nf_conntrack_helper_put(ct_info->helper); |
fec9c271 | 1829 | } |
06bd2bdf | 1830 | if (ct_info->ct) { |
06bd2bdf YHW |
1831 | if (ct_info->timeout[0]) |
1832 | nf_ct_destroy_timeout(ct_info->ct); | |
6d670497 | 1833 | nf_ct_tmpl_free(ct_info->ct); |
06bd2bdf | 1834 | } |
7f8a436e | 1835 | } |
c2ac6673 | 1836 | |
11efd5cb YHW |
1837 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
1838 | static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net) | |
1839 | { | |
1840 | int i, err; | |
1841 | ||
1842 | ovs_net->ct_limit_info = kmalloc(sizeof(*ovs_net->ct_limit_info), | |
1843 | GFP_KERNEL); | |
1844 | if (!ovs_net->ct_limit_info) | |
1845 | return -ENOMEM; | |
1846 | ||
1847 | ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT; | |
1848 | ovs_net->ct_limit_info->limits = | |
1849 | kmalloc_array(CT_LIMIT_HASH_BUCKETS, sizeof(struct hlist_head), | |
1850 | GFP_KERNEL); | |
1851 | if (!ovs_net->ct_limit_info->limits) { | |
1852 | kfree(ovs_net->ct_limit_info); | |
1853 | return -ENOMEM; | |
1854 | } | |
1855 | ||
1856 | for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++) | |
1857 | INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]); | |
1858 | ||
1859 | ovs_net->ct_limit_info->data = | |
1860 | nf_conncount_init(net, NFPROTO_INET, sizeof(u32)); | |
1861 | ||
1862 | if (IS_ERR(ovs_net->ct_limit_info->data)) { | |
1863 | err = PTR_ERR(ovs_net->ct_limit_info->data); | |
1864 | kfree(ovs_net->ct_limit_info->limits); | |
1865 | kfree(ovs_net->ct_limit_info); | |
1866 | pr_err("openvswitch: failed to init nf_conncount %d\n", err); | |
1867 | return err; | |
1868 | } | |
1869 | return 0; | |
1870 | } | |
1871 | ||
1872 | static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net) | |
1873 | { | |
1874 | const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info; | |
1875 | int i; | |
1876 | ||
1877 | nf_conncount_destroy(net, NFPROTO_INET, info->data); | |
1878 | for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) { | |
1879 | struct hlist_head *head = &info->limits[i]; | |
1880 | struct ovs_ct_limit *ct_limit; | |
1881 | ||
1882 | hlist_for_each_entry_rcu(ct_limit, head, hlist_node) | |
1883 | kfree_rcu(ct_limit, rcu); | |
1884 | } | |
1885 | kfree(ovs_net->ct_limit_info->limits); | |
1886 | kfree(ovs_net->ct_limit_info); | |
1887 | } | |
1888 | ||
1889 | static struct sk_buff * | |
1890 | ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd, | |
1891 | struct ovs_header **ovs_reply_header) | |
1892 | { | |
1893 | struct ovs_header *ovs_header = info->userhdr; | |
1894 | struct sk_buff *skb; | |
1895 | ||
1896 | skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1897 | if (!skb) | |
1898 | return ERR_PTR(-ENOMEM); | |
1899 | ||
1900 | *ovs_reply_header = genlmsg_put(skb, info->snd_portid, | |
1901 | info->snd_seq, | |
1902 | &dp_ct_limit_genl_family, 0, cmd); | |
1903 | ||
1904 | if (!*ovs_reply_header) { | |
1905 | nlmsg_free(skb); | |
1906 | return ERR_PTR(-EMSGSIZE); | |
1907 | } | |
1908 | (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex; | |
1909 | ||
1910 | return skb; | |
1911 | } | |
1912 | ||
1913 | static bool check_zone_id(int zone_id, u16 *pzone) | |
1914 | { | |
1915 | if (zone_id >= 0 && zone_id <= 65535) { | |
1916 | *pzone = (u16)zone_id; | |
1917 | return true; | |
1918 | } | |
1919 | return false; | |
1920 | } | |
1921 | ||
1922 | static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit, | |
1923 | struct ovs_ct_limit_info *info) | |
1924 | { | |
1925 | struct ovs_zone_limit *zone_limit; | |
1926 | int rem; | |
1927 | u16 zone; | |
1928 | ||
1929 | rem = NLA_ALIGN(nla_len(nla_zone_limit)); | |
1930 | zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); | |
1931 | ||
1932 | while (rem >= sizeof(*zone_limit)) { | |
1933 | if (unlikely(zone_limit->zone_id == | |
1934 | OVS_ZONE_LIMIT_DEFAULT_ZONE)) { | |
1935 | ovs_lock(); | |
1936 | info->default_limit = zone_limit->limit; | |
1937 | ovs_unlock(); | |
1938 | } else if (unlikely(!check_zone_id( | |
1939 | zone_limit->zone_id, &zone))) { | |
1940 | OVS_NLERR(true, "zone id is out of range"); | |
1941 | } else { | |
1942 | struct ovs_ct_limit *ct_limit; | |
1943 | ||
1944 | ct_limit = kmalloc(sizeof(*ct_limit), GFP_KERNEL); | |
1945 | if (!ct_limit) | |
1946 | return -ENOMEM; | |
1947 | ||
1948 | ct_limit->zone = zone; | |
1949 | ct_limit->limit = zone_limit->limit; | |
1950 | ||
1951 | ovs_lock(); | |
1952 | ct_limit_set(info, ct_limit); | |
1953 | ovs_unlock(); | |
1954 | } | |
1955 | rem -= NLA_ALIGN(sizeof(*zone_limit)); | |
1956 | zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + | |
1957 | NLA_ALIGN(sizeof(*zone_limit))); | |
1958 | } | |
1959 | ||
1960 | if (rem) | |
1961 | OVS_NLERR(true, "set zone limit has %d unknown bytes", rem); | |
1962 | ||
1963 | return 0; | |
1964 | } | |
1965 | ||
1966 | static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit, | |
1967 | struct ovs_ct_limit_info *info) | |
1968 | { | |
1969 | struct ovs_zone_limit *zone_limit; | |
1970 | int rem; | |
1971 | u16 zone; | |
1972 | ||
1973 | rem = NLA_ALIGN(nla_len(nla_zone_limit)); | |
1974 | zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); | |
1975 | ||
1976 | while (rem >= sizeof(*zone_limit)) { | |
1977 | if (unlikely(zone_limit->zone_id == | |
1978 | OVS_ZONE_LIMIT_DEFAULT_ZONE)) { | |
1979 | ovs_lock(); | |
1980 | info->default_limit = OVS_CT_LIMIT_DEFAULT; | |
1981 | ovs_unlock(); | |
1982 | } else if (unlikely(!check_zone_id( | |
1983 | zone_limit->zone_id, &zone))) { | |
1984 | OVS_NLERR(true, "zone id is out of range"); | |
1985 | } else { | |
1986 | ovs_lock(); | |
1987 | ct_limit_del(info, zone); | |
1988 | ovs_unlock(); | |
1989 | } | |
1990 | rem -= NLA_ALIGN(sizeof(*zone_limit)); | |
1991 | zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + | |
1992 | NLA_ALIGN(sizeof(*zone_limit))); | |
1993 | } | |
1994 | ||
1995 | if (rem) | |
1996 | OVS_NLERR(true, "del zone limit has %d unknown bytes", rem); | |
1997 | ||
1998 | return 0; | |
1999 | } | |
2000 | ||
2001 | static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info, | |
2002 | struct sk_buff *reply) | |
2003 | { | |
2004 | struct ovs_zone_limit zone_limit; | |
2005 | int err; | |
2006 | ||
2007 | zone_limit.zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE; | |
2008 | zone_limit.limit = info->default_limit; | |
2009 | err = nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit); | |
2010 | if (err) | |
2011 | return err; | |
2012 | ||
2013 | return 0; | |
2014 | } | |
2015 | ||
2016 | static int __ovs_ct_limit_get_zone_limit(struct net *net, | |
2017 | struct nf_conncount_data *data, | |
2018 | u16 zone_id, u32 limit, | |
2019 | struct sk_buff *reply) | |
2020 | { | |
2021 | struct nf_conntrack_zone ct_zone; | |
2022 | struct ovs_zone_limit zone_limit; | |
2023 | u32 conncount_key = zone_id; | |
2024 | ||
2025 | zone_limit.zone_id = zone_id; | |
2026 | zone_limit.limit = limit; | |
2027 | nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0); | |
2028 | ||
2029 | zone_limit.count = nf_conncount_count(net, data, &conncount_key, NULL, | |
2030 | &ct_zone); | |
2031 | return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit); | |
2032 | } | |
2033 | ||
2034 | static int ovs_ct_limit_get_zone_limit(struct net *net, | |
2035 | struct nlattr *nla_zone_limit, | |
2036 | struct ovs_ct_limit_info *info, | |
2037 | struct sk_buff *reply) | |
2038 | { | |
2039 | struct ovs_zone_limit *zone_limit; | |
2040 | int rem, err; | |
2041 | u32 limit; | |
2042 | u16 zone; | |
2043 | ||
2044 | rem = NLA_ALIGN(nla_len(nla_zone_limit)); | |
2045 | zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); | |
2046 | ||
2047 | while (rem >= sizeof(*zone_limit)) { | |
2048 | if (unlikely(zone_limit->zone_id == | |
2049 | OVS_ZONE_LIMIT_DEFAULT_ZONE)) { | |
2050 | err = ovs_ct_limit_get_default_limit(info, reply); | |
2051 | if (err) | |
2052 | return err; | |
2053 | } else if (unlikely(!check_zone_id(zone_limit->zone_id, | |
2054 | &zone))) { | |
2055 | OVS_NLERR(true, "zone id is out of range"); | |
2056 | } else { | |
2057 | rcu_read_lock(); | |
2058 | limit = ct_limit_get(info, zone); | |
2059 | rcu_read_unlock(); | |
2060 | ||
2061 | err = __ovs_ct_limit_get_zone_limit( | |
2062 | net, info->data, zone, limit, reply); | |
2063 | if (err) | |
2064 | return err; | |
2065 | } | |
2066 | rem -= NLA_ALIGN(sizeof(*zone_limit)); | |
2067 | zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + | |
2068 | NLA_ALIGN(sizeof(*zone_limit))); | |
2069 | } | |
2070 | ||
2071 | if (rem) | |
2072 | OVS_NLERR(true, "get zone limit has %d unknown bytes", rem); | |
2073 | ||
2074 | return 0; | |
2075 | } | |
2076 | ||
2077 | static int ovs_ct_limit_get_all_zone_limit(struct net *net, | |
2078 | struct ovs_ct_limit_info *info, | |
2079 | struct sk_buff *reply) | |
2080 | { | |
2081 | struct ovs_ct_limit *ct_limit; | |
2082 | struct hlist_head *head; | |
2083 | int i, err = 0; | |
2084 | ||
2085 | err = ovs_ct_limit_get_default_limit(info, reply); | |
2086 | if (err) | |
2087 | return err; | |
2088 | ||
2089 | rcu_read_lock(); | |
2090 | for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) { | |
2091 | head = &info->limits[i]; | |
2092 | hlist_for_each_entry_rcu(ct_limit, head, hlist_node) { | |
2093 | err = __ovs_ct_limit_get_zone_limit(net, info->data, | |
2094 | ct_limit->zone, ct_limit->limit, reply); | |
2095 | if (err) | |
2096 | goto exit_err; | |
2097 | } | |
2098 | } | |
2099 | ||
2100 | exit_err: | |
2101 | rcu_read_unlock(); | |
2102 | return err; | |
2103 | } | |
2104 | ||
2105 | static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
2106 | { | |
2107 | struct nlattr **a = info->attrs; | |
2108 | struct sk_buff *reply; | |
2109 | struct ovs_header *ovs_reply_header; | |
2110 | struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); | |
2111 | struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; | |
2112 | int err; | |
2113 | ||
2114 | reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET, | |
2115 | &ovs_reply_header); | |
2116 | if (IS_ERR(reply)) | |
2117 | return PTR_ERR(reply); | |
2118 | ||
2119 | if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { | |
2120 | err = -EINVAL; | |
2121 | goto exit_err; | |
2122 | } | |
2123 | ||
2124 | err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], | |
2125 | ct_limit_info); | |
2126 | if (err) | |
2127 | goto exit_err; | |
2128 | ||
2129 | static_branch_enable(&ovs_ct_limit_enabled); | |
2130 | ||
2131 | genlmsg_end(reply, ovs_reply_header); | |
2132 | return genlmsg_reply(reply, info); | |
2133 | ||
2134 | exit_err: | |
2135 | nlmsg_free(reply); | |
2136 | return err; | |
2137 | } | |
2138 | ||
2139 | static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
2140 | { | |
2141 | struct nlattr **a = info->attrs; | |
2142 | struct sk_buff *reply; | |
2143 | struct ovs_header *ovs_reply_header; | |
2144 | struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); | |
2145 | struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; | |
2146 | int err; | |
2147 | ||
2148 | reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL, | |
2149 | &ovs_reply_header); | |
2150 | if (IS_ERR(reply)) | |
2151 | return PTR_ERR(reply); | |
2152 | ||
2153 | if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { | |
2154 | err = -EINVAL; | |
2155 | goto exit_err; | |
2156 | } | |
2157 | ||
2158 | err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], | |
2159 | ct_limit_info); | |
2160 | if (err) | |
2161 | goto exit_err; | |
2162 | ||
2163 | genlmsg_end(reply, ovs_reply_header); | |
2164 | return genlmsg_reply(reply, info); | |
2165 | ||
2166 | exit_err: | |
2167 | nlmsg_free(reply); | |
2168 | return err; | |
2169 | } | |
2170 | ||
2171 | static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
2172 | { | |
2173 | struct nlattr **a = info->attrs; | |
2174 | struct nlattr *nla_reply; | |
2175 | struct sk_buff *reply; | |
2176 | struct ovs_header *ovs_reply_header; | |
2177 | struct net *net = sock_net(skb->sk); | |
2178 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
2179 | struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; | |
2180 | int err; | |
2181 | ||
2182 | reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET, | |
2183 | &ovs_reply_header); | |
2184 | if (IS_ERR(reply)) | |
2185 | return PTR_ERR(reply); | |
2186 | ||
ae0be8de | 2187 | nla_reply = nla_nest_start_noflag(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT); |
ca965346 CIK |
2188 | if (!nla_reply) { |
2189 | err = -EMSGSIZE; | |
2190 | goto exit_err; | |
2191 | } | |
11efd5cb YHW |
2192 | |
2193 | if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { | |
2194 | err = ovs_ct_limit_get_zone_limit( | |
2195 | net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info, | |
2196 | reply); | |
2197 | if (err) | |
2198 | goto exit_err; | |
2199 | } else { | |
2200 | err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info, | |
2201 | reply); | |
2202 | if (err) | |
2203 | goto exit_err; | |
2204 | } | |
2205 | ||
2206 | nla_nest_end(reply, nla_reply); | |
2207 | genlmsg_end(reply, ovs_reply_header); | |
2208 | return genlmsg_reply(reply, info); | |
2209 | ||
2210 | exit_err: | |
2211 | nlmsg_free(reply); | |
2212 | return err; | |
2213 | } | |
2214 | ||
2215 | static struct genl_ops ct_limit_genl_ops[] = { | |
2216 | { .cmd = OVS_CT_LIMIT_CMD_SET, | |
ef6243ac | 2217 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
11efd5cb YHW |
2218 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN |
2219 | * privilege. */ | |
11efd5cb YHW |
2220 | .doit = ovs_ct_limit_cmd_set, |
2221 | }, | |
2222 | { .cmd = OVS_CT_LIMIT_CMD_DEL, | |
ef6243ac | 2223 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
11efd5cb YHW |
2224 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN |
2225 | * privilege. */ | |
11efd5cb YHW |
2226 | .doit = ovs_ct_limit_cmd_del, |
2227 | }, | |
2228 | { .cmd = OVS_CT_LIMIT_CMD_GET, | |
ef6243ac | 2229 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
11efd5cb | 2230 | .flags = 0, /* OK for unprivileged users. */ |
11efd5cb YHW |
2231 | .doit = ovs_ct_limit_cmd_get, |
2232 | }, | |
2233 | }; | |
2234 | ||
2235 | static const struct genl_multicast_group ovs_ct_limit_multicast_group = { | |
2236 | .name = OVS_CT_LIMIT_MCGROUP, | |
2237 | }; | |
2238 | ||
2239 | struct genl_family dp_ct_limit_genl_family __ro_after_init = { | |
2240 | .hdrsize = sizeof(struct ovs_header), | |
2241 | .name = OVS_CT_LIMIT_FAMILY, | |
2242 | .version = OVS_CT_LIMIT_VERSION, | |
2243 | .maxattr = OVS_CT_LIMIT_ATTR_MAX, | |
3b0f31f2 | 2244 | .policy = ct_limit_policy, |
11efd5cb YHW |
2245 | .netnsok = true, |
2246 | .parallel_ops = true, | |
2247 | .ops = ct_limit_genl_ops, | |
2248 | .n_ops = ARRAY_SIZE(ct_limit_genl_ops), | |
2249 | .mcgrps = &ovs_ct_limit_multicast_group, | |
2250 | .n_mcgrps = 1, | |
2251 | .module = THIS_MODULE, | |
2252 | }; | |
2253 | #endif | |
2254 | ||
2255 | int ovs_ct_init(struct net *net) | |
c2ac6673 | 2256 | { |
33db4125 | 2257 | unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; |
c2ac6673 JS |
2258 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
2259 | ||
adff6c65 | 2260 | if (nf_connlabels_get(net, n_bits - 1)) { |
c2ac6673 JS |
2261 | ovs_net->xt_label = false; |
2262 | OVS_NLERR(true, "Failed to set connlabel length"); | |
2263 | } else { | |
2264 | ovs_net->xt_label = true; | |
2265 | } | |
11efd5cb YHW |
2266 | |
2267 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) | |
2268 | return ovs_ct_limit_init(net, ovs_net); | |
2269 | #else | |
2270 | return 0; | |
2271 | #endif | |
c2ac6673 JS |
2272 | } |
2273 | ||
2274 | void ovs_ct_exit(struct net *net) | |
2275 | { | |
2276 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
2277 | ||
11efd5cb YHW |
2278 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
2279 | ovs_ct_limit_exit(net, ovs_net); | |
2280 | #endif | |
2281 | ||
c2ac6673 JS |
2282 | if (ovs_net->xt_label) |
2283 | nf_connlabels_put(net); | |
2284 | } |