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a489b168 | 1 | /* |
4ea96698 | 2 | * Copyright (c) 2015-2019 Nicira, Inc. |
a489b168 DDP |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
bd5e81a0 | 18 | #include <ctype.h> |
a489b168 | 19 | #include <errno.h> |
ff6aa424 | 20 | #include <sys/types.h> |
a489b168 DDP |
21 | #include <netinet/in.h> |
22 | #include <netinet/icmp6.h> | |
bd5e81a0 | 23 | #include <string.h> |
a489b168 DDP |
24 | |
25 | #include "bitmap.h" | |
bd5e81a0 | 26 | #include "conntrack.h" |
a489b168 | 27 | #include "conntrack-private.h" |
2078901a | 28 | #include "conntrack-tp.h" |
a489b168 DDP |
29 | #include "coverage.h" |
30 | #include "csum.h" | |
4d4e68ed | 31 | #include "ct-dpif.h" |
a489b168 DDP |
32 | #include "dp-packet.h" |
33 | #include "flow.h" | |
34 | #include "netdev.h" | |
35 | #include "odp-netlink.h" | |
36 | #include "openvswitch/hmap.h" | |
37 | #include "openvswitch/vlog.h" | |
38 | #include "ovs-rcu.h" | |
e6ef6cc6 | 39 | #include "ovs-thread.h" |
fd016ae3 | 40 | #include "openvswitch/poll-loop.h" |
a489b168 DDP |
41 | #include "random.h" |
42 | #include "timeval.h" | |
43 | ||
44 | VLOG_DEFINE_THIS_MODULE(conntrack); | |
45 | ||
46 | COVERAGE_DEFINE(conntrack_full); | |
e6ef6cc6 | 47 | COVERAGE_DEFINE(conntrack_long_cleanup); |
38c69ccf | 48 | COVERAGE_DEFINE(conntrack_l4csum_err); |
a489b168 DDP |
49 | |
50 | struct conn_lookup_ctx { | |
51 | struct conn_key key; | |
52 | struct conn *conn; | |
53 | uint32_t hash; | |
54 | bool reply; | |
dbb597d3 | 55 | bool icmp_related; |
a489b168 DDP |
56 | }; |
57 | ||
bd5e81a0 DB |
58 | enum ftp_ctl_pkt { |
59 | /* Control packets with address and/or port specifiers. */ | |
60 | CT_FTP_CTL_INTEREST, | |
61 | /* Control packets without address and/or port specifiers. */ | |
62 | CT_FTP_CTL_OTHER, | |
63 | CT_FTP_CTL_INVALID, | |
64 | }; | |
65 | ||
66 | enum ct_alg_mode { | |
67 | CT_FTP_MODE_ACTIVE, | |
68 | CT_FTP_MODE_PASSIVE, | |
7be77cb0 | 69 | CT_TFTP_MODE, |
bd5e81a0 DB |
70 | }; |
71 | ||
94e71143 DB |
72 | enum ct_alg_ctl_type { |
73 | CT_ALG_CTL_NONE, | |
74 | CT_ALG_CTL_FTP, | |
75 | CT_ALG_CTL_TFTP, | |
be38342d DB |
76 | /* SIP is not enabled through Openflow and presently only used as |
77 | * an example of an alg that allows a wildcard src ip. */ | |
78 | CT_ALG_CTL_SIP, | |
94e71143 DB |
79 | }; |
80 | ||
a7f33fdb DB |
81 | struct zone_limit { |
82 | struct hmap_node node; | |
83 | struct conntrack_zone_limit czl; | |
84 | }; | |
85 | ||
a489b168 | 86 | static bool conn_key_extract(struct conntrack *, struct dp_packet *, |
66e4ad8a DDP |
87 | ovs_be16 dl_type, struct conn_lookup_ctx *, |
88 | uint16_t zone); | |
a489b168 DDP |
89 | static uint32_t conn_key_hash(const struct conn_key *, uint32_t basis); |
90 | static void conn_key_reverse(struct conn_key *); | |
a489b168 | 91 | static bool valid_new(struct dp_packet *pkt, struct conn_key *); |
967bb5c5 | 92 | static struct conn *new_conn(struct conntrack *ct, struct dp_packet *pkt, |
2078901a WT |
93 | struct conn_key *, long long now, |
94 | uint32_t tp_id); | |
967bb5c5 | 95 | static void delete_conn_cmn(struct conn *); |
a489b168 | 96 | static void delete_conn(struct conn *); |
967bb5c5 DB |
97 | static void delete_conn_one(struct conn *conn); |
98 | static enum ct_update_res conn_update(struct conntrack *ct, struct conn *conn, | |
99 | struct dp_packet *pkt, | |
100 | struct conn_lookup_ctx *ctx, | |
e6ef6cc6 | 101 | long long now); |
a489b168 DDP |
102 | static bool conn_expired(struct conn *, long long now); |
103 | static void set_mark(struct dp_packet *, struct conn *, | |
104 | uint32_t val, uint32_t mask); | |
105 | static void set_label(struct dp_packet *, struct conn *, | |
106 | const struct ovs_key_ct_labels *val, | |
107 | const struct ovs_key_ct_labels *mask); | |
e6ef6cc6 | 108 | static void *clean_thread_main(void *f_); |
a489b168 | 109 | |
286de272 DB |
110 | static bool |
111 | nat_select_range_tuple(struct conntrack *ct, const struct conn *conn, | |
112 | struct conn *nat_conn); | |
113 | ||
114 | static uint8_t | |
115 | reverse_icmp_type(uint8_t type); | |
116 | static uint8_t | |
117 | reverse_icmp6_type(uint8_t type); | |
118 | static inline bool | |
119 | extract_l3_ipv4(struct conn_key *key, const void *data, size_t size, | |
120 | const char **new_data, bool validate_checksum); | |
121 | static inline bool | |
122 | extract_l3_ipv6(struct conn_key *key, const void *data, size_t size, | |
123 | const char **new_data); | |
bd5e81a0 | 124 | static struct alg_exp_node * |
be38342d DB |
125 | expectation_lookup(struct hmap *alg_expectations, const struct conn_key *key, |
126 | uint32_t basis, bool src_ip_wc); | |
bd5e81a0 DB |
127 | |
128 | static int | |
129 | repl_ftp_v4_addr(struct dp_packet *pkt, ovs_be32 v4_addr_rep, | |
130 | char *ftp_data_v4_start, | |
cd7c99a6 | 131 | size_t addr_offset_from_ftp_data_start, size_t addr_size); |
bd5e81a0 DB |
132 | |
133 | static enum ftp_ctl_pkt | |
134 | process_ftp_ctl_v4(struct conntrack *ct, | |
135 | struct dp_packet *pkt, | |
136 | const struct conn *conn_for_expectation, | |
4417ca3d | 137 | ovs_be32 *v4_addr_rep, |
bd5e81a0 | 138 | char **ftp_data_v4_start, |
cd7c99a6 DB |
139 | size_t *addr_offset_from_ftp_data_start, |
140 | size_t *addr_size); | |
bd5e81a0 DB |
141 | |
142 | static enum ftp_ctl_pkt | |
143 | detect_ftp_ctl_type(const struct conn_lookup_ctx *ctx, | |
144 | struct dp_packet *pkt); | |
145 | ||
4417ca3d | 146 | static void |
f51cf36d | 147 | expectation_clean(struct conntrack *ct, const struct conn_key *parent_key); |
4417ca3d | 148 | |
94e71143 DB |
149 | static struct ct_l4_proto *l4_protos[] = { |
150 | [IPPROTO_TCP] = &ct_proto_tcp, | |
151 | [IPPROTO_UDP] = &ct_proto_other, | |
152 | [IPPROTO_ICMP] = &ct_proto_icmp4, | |
153 | [IPPROTO_ICMPV6] = &ct_proto_icmp6, | |
154 | }; | |
155 | ||
bd5e81a0 DB |
156 | static void |
157 | handle_ftp_ctl(struct conntrack *ct, const struct conn_lookup_ctx *ctx, | |
967bb5c5 DB |
158 | struct dp_packet *pkt, struct conn *ec, long long now, |
159 | enum ftp_ctl_pkt ftp_ctl, bool nat); | |
bd5e81a0 | 160 | |
7be77cb0 DB |
161 | static void |
162 | handle_tftp_ctl(struct conntrack *ct, | |
94e71143 | 163 | const struct conn_lookup_ctx *ctx OVS_UNUSED, |
967bb5c5 DB |
164 | struct dp_packet *pkt, struct conn *conn_for_expectation, |
165 | long long now OVS_UNUSED, enum ftp_ctl_pkt ftp_ctl OVS_UNUSED, | |
166 | bool nat OVS_UNUSED); | |
94e71143 DB |
167 | |
168 | typedef void (*alg_helper)(struct conntrack *ct, | |
169 | const struct conn_lookup_ctx *ctx, | |
170 | struct dp_packet *pkt, | |
967bb5c5 | 171 | struct conn *conn_for_expectation, |
94e71143 DB |
172 | long long now, enum ftp_ctl_pkt ftp_ctl, |
173 | bool nat); | |
174 | ||
175 | static alg_helper alg_helpers[] = { | |
176 | [CT_ALG_CTL_NONE] = NULL, | |
177 | [CT_ALG_CTL_FTP] = handle_ftp_ctl, | |
178 | [CT_ALG_CTL_TFTP] = handle_tftp_ctl, | |
a489b168 DDP |
179 | }; |
180 | ||
bd5e81a0 DB |
181 | /* The maximum TCP or UDP port number. */ |
182 | #define CT_MAX_L4_PORT 65535 | |
bd5e81a0 DB |
183 | /* String buffer used for parsing FTP string messages. |
184 | * This is sized about twice what is needed to leave some | |
185 | * margin of error. */ | |
186 | #define LARGEST_FTP_MSG_OF_INTEREST 128 | |
187 | /* FTP port string used in active mode. */ | |
188 | #define FTP_PORT_CMD "PORT" | |
189 | /* FTP pasv string used in passive mode. */ | |
190 | #define FTP_PASV_REPLY_CODE "227" | |
191 | /* Maximum decimal digits for port in FTP command. | |
192 | * The port is represented as two 3 digit numbers with the | |
193 | * high part a multiple of 256. */ | |
194 | #define MAX_FTP_PORT_DGTS 3 | |
195 | ||
196 | /* FTP extension EPRT string used for active mode. */ | |
197 | #define FTP_EPRT_CMD "EPRT" | |
198 | /* FTP extension EPSV string used for passive mode. */ | |
199 | #define FTP_EPSV_REPLY "EXTENDED PASSIVE" | |
200 | /* Maximum decimal digits for port in FTP extended command. */ | |
201 | #define MAX_EXT_FTP_PORT_DGTS 5 | |
202 | /* FTP extended command code for IPv6. */ | |
203 | #define FTP_AF_V6 '2' | |
204 | /* Used to indicate a wildcard L4 source port number for ALGs. | |
205 | * This is used for port numbers that we cannot predict in | |
206 | * expectations. */ | |
207 | #define ALG_WC_SRC_PORT 0 | |
208 | ||
a489b168 | 209 | /* If the total number of connections goes above this value, no new connections |
286de272 | 210 | * are accepted; this is for CT_CONN_TYPE_DEFAULT connections. */ |
a489b168 DDP |
211 | #define DEFAULT_N_CONN_LIMIT 3000000 |
212 | ||
5ed7a0b4 DB |
213 | /* Does a member by member comparison of two conn_keys; this |
214 | * function must be kept in sync with struct conn_key; returns 0 | |
215 | * if the keys are equal or 1 if the keys are not equal. */ | |
216 | static int | |
217 | conn_key_cmp(const struct conn_key *key1, const struct conn_key *key2) | |
218 | { | |
219 | if (!memcmp(&key1->src.addr, &key2->src.addr, sizeof key1->src.addr) && | |
220 | !memcmp(&key1->dst.addr, &key2->dst.addr, sizeof key1->dst.addr) && | |
221 | (key1->src.icmp_id == key2->src.icmp_id) && | |
222 | (key1->src.icmp_type == key2->src.icmp_type) && | |
223 | (key1->src.icmp_code == key2->src.icmp_code) && | |
224 | (key1->dst.icmp_id == key2->dst.icmp_id) && | |
225 | (key1->dst.icmp_type == key2->dst.icmp_type) && | |
226 | (key1->dst.icmp_code == key2->dst.icmp_code) && | |
227 | (key1->dl_type == key2->dl_type) && | |
228 | (key1->zone == key2->zone) && | |
229 | (key1->nw_proto == key2->nw_proto)) { | |
230 | ||
231 | return 0; | |
232 | } | |
233 | return 1; | |
234 | } | |
235 | ||
d8682ee5 | 236 | static void |
dec0dbbc DB |
237 | ct_print_conn_info(const struct conn *c, const char *log_msg, |
238 | enum vlog_level vll, bool force, bool rl_on) | |
66f400f5 DB |
239 | { |
240 | #define CT_VLOG(RL_ON, LEVEL, ...) \ | |
241 | do { \ | |
242 | if (RL_ON) { \ | |
243 | static struct vlog_rate_limit rl_ = VLOG_RATE_LIMIT_INIT(5, 5); \ | |
244 | vlog_rate_limit(&this_module, LEVEL, &rl_, __VA_ARGS__); \ | |
245 | } else { \ | |
246 | vlog(&this_module, LEVEL, __VA_ARGS__); \ | |
247 | } \ | |
248 | } while (0) | |
249 | ||
250 | if (OVS_UNLIKELY(force || vlog_is_enabled(&this_module, vll))) { | |
251 | if (c->key.dl_type == htons(ETH_TYPE_IP)) { | |
252 | CT_VLOG(rl_on, vll, "%s: src ip "IP_FMT" dst ip "IP_FMT" rev src " | |
253 | "ip "IP_FMT" rev dst ip "IP_FMT" src/dst ports " | |
254 | "%"PRIu16"/%"PRIu16" rev src/dst ports " | |
255 | "%"PRIu16"/%"PRIu16" zone/rev zone " | |
256 | "%"PRIu16"/%"PRIu16" nw_proto/rev nw_proto " | |
257 | "%"PRIu8"/%"PRIu8, log_msg, | |
cda1b109 DB |
258 | IP_ARGS(c->key.src.addr.ipv4), |
259 | IP_ARGS(c->key.dst.addr.ipv4), | |
260 | IP_ARGS(c->rev_key.src.addr.ipv4), | |
261 | IP_ARGS(c->rev_key.dst.addr.ipv4), | |
66f400f5 DB |
262 | ntohs(c->key.src.port), ntohs(c->key.dst.port), |
263 | ntohs(c->rev_key.src.port), ntohs(c->rev_key.dst.port), | |
264 | c->key.zone, c->rev_key.zone, c->key.nw_proto, | |
265 | c->rev_key.nw_proto); | |
266 | } else { | |
267 | char ip6_s[INET6_ADDRSTRLEN]; | |
268 | inet_ntop(AF_INET6, &c->key.src.addr.ipv6, ip6_s, sizeof ip6_s); | |
269 | char ip6_d[INET6_ADDRSTRLEN]; | |
270 | inet_ntop(AF_INET6, &c->key.dst.addr.ipv6, ip6_d, sizeof ip6_d); | |
271 | char ip6_rs[INET6_ADDRSTRLEN]; | |
272 | inet_ntop(AF_INET6, &c->rev_key.src.addr.ipv6, ip6_rs, | |
273 | sizeof ip6_rs); | |
274 | char ip6_rd[INET6_ADDRSTRLEN]; | |
275 | inet_ntop(AF_INET6, &c->rev_key.dst.addr.ipv6, ip6_rd, | |
276 | sizeof ip6_rd); | |
277 | ||
278 | CT_VLOG(rl_on, vll, "%s: src ip %s dst ip %s rev src ip %s" | |
279 | " rev dst ip %s src/dst ports %"PRIu16"/%"PRIu16 | |
280 | " rev src/dst ports %"PRIu16"/%"PRIu16" zone/rev zone " | |
281 | "%"PRIu16"/%"PRIu16" nw_proto/rev nw_proto " | |
282 | "%"PRIu8"/%"PRIu8, log_msg, ip6_s, ip6_d, ip6_rs, | |
283 | ip6_rd, ntohs(c->key.src.port), ntohs(c->key.dst.port), | |
284 | ntohs(c->rev_key.src.port), ntohs(c->rev_key.dst.port), | |
285 | c->key.zone, c->rev_key.zone, c->key.nw_proto, | |
286 | c->rev_key.nw_proto); | |
287 | } | |
288 | } | |
289 | } | |
290 | ||
a489b168 DDP |
291 | /* Initializes the connection tracker 'ct'. The caller is responsible for |
292 | * calling 'conntrack_destroy()', when the instance is not needed anymore */ | |
57593fd2 DB |
293 | struct conntrack * |
294 | conntrack_init(void) | |
a489b168 | 295 | { |
57593fd2 DB |
296 | struct conntrack *ct = xzalloc(sizeof *ct); |
297 | ||
967bb5c5 DB |
298 | ovs_rwlock_init(&ct->resources_lock); |
299 | ovs_rwlock_wrlock(&ct->resources_lock); | |
bd5e81a0 | 300 | hmap_init(&ct->alg_expectations); |
4417ca3d | 301 | hindex_init(&ct->alg_expectation_refs); |
967bb5c5 | 302 | ovs_rwlock_unlock(&ct->resources_lock); |
a489b168 | 303 | |
967bb5c5 DB |
304 | ovs_mutex_init_adaptive(&ct->ct_lock); |
305 | ovs_mutex_lock(&ct->ct_lock); | |
306 | cmap_init(&ct->conns); | |
307 | for (unsigned i = 0; i < ARRAY_SIZE(ct->exp_lists); i++) { | |
308 | ovs_list_init(&ct->exp_lists[i]); | |
a489b168 | 309 | } |
a7f33fdb DB |
310 | hmap_init(&ct->zone_limits); |
311 | ct->zone_limit_seq = 0; | |
2078901a | 312 | timeout_policy_init(ct); |
967bb5c5 DB |
313 | ovs_mutex_unlock(&ct->ct_lock); |
314 | ||
a489b168 DDP |
315 | ct->hash_basis = random_uint32(); |
316 | atomic_count_init(&ct->n_conn, 0); | |
317 | atomic_init(&ct->n_conn_limit, DEFAULT_N_CONN_LIMIT); | |
64207120 | 318 | atomic_init(&ct->tcp_seq_chk, true); |
e6ef6cc6 DDP |
319 | latch_init(&ct->clean_thread_exit); |
320 | ct->clean_thread = ovs_thread_create("ct_clean", clean_thread_main, ct); | |
4ea96698 | 321 | ct->ipf = ipf_init(); |
57593fd2 DB |
322 | |
323 | return ct; | |
a489b168 DDP |
324 | } |
325 | ||
a7f33fdb DB |
326 | static uint32_t |
327 | zone_key_hash(int32_t zone, uint32_t basis) | |
328 | { | |
329 | size_t hash = hash_int((OVS_FORCE uint32_t) zone, basis); | |
330 | return hash; | |
331 | } | |
332 | ||
333 | static struct zone_limit * | |
334 | zone_limit_lookup(struct conntrack *ct, int32_t zone) | |
335 | OVS_REQUIRES(ct->ct_lock) | |
336 | { | |
337 | uint32_t hash = zone_key_hash(zone, ct->hash_basis); | |
338 | struct zone_limit *zl; | |
339 | HMAP_FOR_EACH_IN_BUCKET (zl, node, hash, &ct->zone_limits) { | |
340 | if (zl->czl.zone == zone) { | |
341 | return zl; | |
342 | } | |
343 | } | |
344 | return NULL; | |
345 | } | |
346 | ||
347 | static struct zone_limit * | |
348 | zone_limit_lookup_or_default(struct conntrack *ct, int32_t zone) | |
349 | OVS_REQUIRES(ct->ct_lock) | |
350 | { | |
351 | struct zone_limit *zl = zone_limit_lookup(ct, zone); | |
352 | return zl ? zl : zone_limit_lookup(ct, DEFAULT_ZONE); | |
353 | } | |
354 | ||
355 | struct conntrack_zone_limit | |
356 | zone_limit_get(struct conntrack *ct, int32_t zone) | |
357 | { | |
358 | ovs_mutex_lock(&ct->ct_lock); | |
359 | struct conntrack_zone_limit czl = {DEFAULT_ZONE, 0, 0, 0}; | |
360 | struct zone_limit *zl = zone_limit_lookup_or_default(ct, zone); | |
361 | if (zl) { | |
362 | czl = zl->czl; | |
363 | } | |
364 | ovs_mutex_unlock(&ct->ct_lock); | |
365 | return czl; | |
366 | } | |
367 | ||
368 | static int | |
369 | zone_limit_create(struct conntrack *ct, int32_t zone, uint32_t limit) | |
370 | OVS_REQUIRES(ct->ct_lock) | |
371 | { | |
372 | if (zone >= DEFAULT_ZONE && zone <= MAX_ZONE) { | |
373 | struct zone_limit *zl = xzalloc(sizeof *zl); | |
374 | zl->czl.limit = limit; | |
375 | zl->czl.zone = zone; | |
376 | zl->czl.zone_limit_seq = ct->zone_limit_seq++; | |
377 | uint32_t hash = zone_key_hash(zone, ct->hash_basis); | |
378 | hmap_insert(&ct->zone_limits, &zl->node, hash); | |
379 | return 0; | |
380 | } else { | |
381 | return EINVAL; | |
382 | } | |
383 | } | |
384 | ||
385 | int | |
386 | zone_limit_update(struct conntrack *ct, int32_t zone, uint32_t limit) | |
387 | { | |
388 | int err = 0; | |
389 | ovs_mutex_lock(&ct->ct_lock); | |
390 | struct zone_limit *zl = zone_limit_lookup(ct, zone); | |
391 | if (zl) { | |
392 | zl->czl.limit = limit; | |
393 | VLOG_INFO("Changed zone limit of %u for zone %d", limit, zone); | |
394 | } else { | |
395 | err = zone_limit_create(ct, zone, limit); | |
396 | if (!err) { | |
397 | VLOG_INFO("Created zone limit of %u for zone %d", limit, zone); | |
398 | } else { | |
399 | VLOG_WARN("Request to create zone limit for invalid zone %d", | |
400 | zone); | |
401 | } | |
402 | } | |
403 | ovs_mutex_unlock(&ct->ct_lock); | |
404 | return err; | |
405 | } | |
406 | ||
407 | static void | |
408 | zone_limit_clean(struct conntrack *ct, struct zone_limit *zl) | |
409 | OVS_REQUIRES(ct->ct_lock) | |
410 | { | |
411 | hmap_remove(&ct->zone_limits, &zl->node); | |
412 | free(zl); | |
413 | } | |
414 | ||
415 | int | |
416 | zone_limit_delete(struct conntrack *ct, uint16_t zone) | |
417 | { | |
418 | ovs_mutex_lock(&ct->ct_lock); | |
419 | struct zone_limit *zl = zone_limit_lookup(ct, zone); | |
420 | if (zl) { | |
421 | zone_limit_clean(ct, zl); | |
422 | VLOG_INFO("Deleted zone limit for zone %d", zone); | |
423 | } else { | |
424 | VLOG_INFO("Attempted delete of non-existent zone limit: zone %d", | |
425 | zone); | |
426 | } | |
427 | ovs_mutex_unlock(&ct->ct_lock); | |
428 | return 0; | |
429 | } | |
430 | ||
967bb5c5 DB |
431 | static void |
432 | conn_clean_cmn(struct conntrack *ct, struct conn *conn) | |
433 | OVS_REQUIRES(ct->ct_lock) | |
434 | { | |
435 | if (conn->alg) { | |
436 | expectation_clean(ct, &conn->key); | |
437 | } | |
438 | ||
439 | uint32_t hash = conn_key_hash(&conn->key, ct->hash_basis); | |
440 | cmap_remove(&ct->conns, &conn->cm_node, hash); | |
a7f33fdb DB |
441 | |
442 | struct zone_limit *zl = zone_limit_lookup(ct, conn->admit_zone); | |
443 | if (zl && zl->czl.zone_limit_seq == conn->zone_limit_seq) { | |
444 | zl->czl.count--; | |
445 | } | |
967bb5c5 DB |
446 | } |
447 | ||
448 | /* Must be called with 'conn' of 'conn_type' CT_CONN_TYPE_DEFAULT. Also | |
449 | * removes the associated nat 'conn' from the lookup datastructures. */ | |
450 | static void | |
451 | conn_clean(struct conntrack *ct, struct conn *conn) | |
452 | OVS_REQUIRES(ct->ct_lock) | |
453 | { | |
454 | ovs_assert(conn->conn_type == CT_CONN_TYPE_DEFAULT); | |
455 | ||
456 | conn_clean_cmn(ct, conn); | |
457 | if (conn->nat_conn) { | |
458 | uint32_t hash = conn_key_hash(&conn->nat_conn->key, ct->hash_basis); | |
459 | cmap_remove(&ct->conns, &conn->nat_conn->cm_node, hash); | |
460 | } | |
461 | ovs_list_remove(&conn->exp_node); | |
5f918a8a | 462 | conn->cleaned = true; |
967bb5c5 DB |
463 | ovsrcu_postpone(delete_conn, conn); |
464 | atomic_count_dec(&ct->n_conn); | |
465 | } | |
466 | ||
467 | static void | |
468 | conn_clean_one(struct conntrack *ct, struct conn *conn) | |
469 | OVS_REQUIRES(ct->ct_lock) | |
470 | { | |
471 | conn_clean_cmn(ct, conn); | |
472 | if (conn->conn_type == CT_CONN_TYPE_DEFAULT) { | |
473 | ovs_list_remove(&conn->exp_node); | |
5f918a8a | 474 | conn->cleaned = true; |
967bb5c5 DB |
475 | atomic_count_dec(&ct->n_conn); |
476 | } | |
477 | ovsrcu_postpone(delete_conn_one, conn); | |
478 | } | |
479 | ||
480 | /* Destroys the connection tracker 'ct' and frees all the allocated memory. | |
481 | * The caller of this function must already have shut down packet input | |
482 | * and PMD threads (which would have been quiesced). */ | |
a489b168 DDP |
483 | void |
484 | conntrack_destroy(struct conntrack *ct) | |
485 | { | |
967bb5c5 | 486 | struct conn *conn; |
e6ef6cc6 DDP |
487 | latch_set(&ct->clean_thread_exit); |
488 | pthread_join(ct->clean_thread, NULL); | |
489 | latch_destroy(&ct->clean_thread_exit); | |
a489b168 | 490 | |
967bb5c5 DB |
491 | ovs_mutex_lock(&ct->ct_lock); |
492 | CMAP_FOR_EACH (conn, cm_node, &ct->conns) { | |
493 | conn_clean_one(ct, conn); | |
a489b168 | 494 | } |
967bb5c5 | 495 | cmap_destroy(&ct->conns); |
a7f33fdb DB |
496 | |
497 | struct zone_limit *zl; | |
498 | HMAP_FOR_EACH_POP (zl, node, &ct->zone_limits) { | |
499 | free(zl); | |
500 | } | |
501 | hmap_destroy(&ct->zone_limits); | |
502 | ||
2078901a WT |
503 | struct timeout_policy *tp; |
504 | HMAP_FOR_EACH_POP (tp, node, &ct->timeout_policies) { | |
505 | free(tp); | |
506 | } | |
507 | hmap_destroy(&ct->timeout_policies); | |
508 | ||
967bb5c5 DB |
509 | ovs_mutex_unlock(&ct->ct_lock); |
510 | ovs_mutex_destroy(&ct->ct_lock); | |
bd5e81a0 | 511 | |
967bb5c5 | 512 | ovs_rwlock_wrlock(&ct->resources_lock); |
bd5e81a0 DB |
513 | struct alg_exp_node *alg_exp_node; |
514 | HMAP_FOR_EACH_POP (alg_exp_node, node, &ct->alg_expectations) { | |
515 | free(alg_exp_node); | |
516 | } | |
bd5e81a0 | 517 | hmap_destroy(&ct->alg_expectations); |
4417ca3d | 518 | hindex_destroy(&ct->alg_expectation_refs); |
967bb5c5 DB |
519 | ovs_rwlock_unlock(&ct->resources_lock); |
520 | ovs_rwlock_destroy(&ct->resources_lock); | |
521 | ||
4ea96698 | 522 | ipf_destroy(ct->ipf); |
21ffe409 | 523 | free(ct); |
a489b168 DDP |
524 | } |
525 | \f | |
967bb5c5 DB |
526 | |
527 | static bool | |
528 | conn_key_lookup(struct conntrack *ct, const struct conn_key *key, | |
529 | uint32_t hash, long long now, struct conn **conn_out, | |
530 | bool *reply) | |
a489b168 | 531 | { |
967bb5c5 DB |
532 | struct conn *conn; |
533 | bool found = false; | |
534 | ||
535 | CMAP_FOR_EACH_WITH_HASH (conn, cm_node, hash, &ct->conns) { | |
536 | if (!conn_key_cmp(&conn->key, key) && !conn_expired(conn, now)) { | |
537 | found = true; | |
538 | if (reply) { | |
539 | *reply = false; | |
540 | } | |
541 | break; | |
542 | } | |
543 | if (!conn_key_cmp(&conn->rev_key, key) && !conn_expired(conn, now)) { | |
544 | found = true; | |
545 | if (reply) { | |
546 | *reply = true; | |
547 | } | |
548 | break; | |
549 | } | |
550 | } | |
a489b168 | 551 | |
967bb5c5 DB |
552 | if (found && conn_out) { |
553 | *conn_out = conn; | |
554 | } else if (conn_out) { | |
555 | *conn_out = NULL; | |
556 | } | |
557 | return found; | |
a489b168 DDP |
558 | } |
559 | ||
4048c508 DB |
560 | static bool |
561 | conn_lookup(struct conntrack *ct, const struct conn_key *key, | |
562 | long long now, struct conn **conn_out, bool *reply) | |
563 | { | |
564 | uint32_t hash = conn_key_hash(key, ct->hash_basis); | |
565 | return conn_key_lookup(ct, key, hash, now, conn_out, reply); | |
566 | } | |
567 | ||
a489b168 | 568 | static void |
286de272 | 569 | write_ct_md(struct dp_packet *pkt, uint16_t zone, const struct conn *conn, |
bd5e81a0 | 570 | const struct conn_key *key, const struct alg_exp_node *alg_exp) |
a489b168 | 571 | { |
286de272 | 572 | pkt->md.ct_state |= CS_TRACKED; |
a489b168 | 573 | pkt->md.ct_zone = zone; |
967bb5c5 DB |
574 | |
575 | if (conn) { | |
576 | ovs_mutex_lock(&conn->lock); | |
577 | pkt->md.ct_mark = conn->mark; | |
578 | pkt->md.ct_label = conn->label; | |
579 | ovs_mutex_unlock(&conn->lock); | |
580 | } else { | |
581 | pkt->md.ct_mark = 0; | |
582 | pkt->md.ct_label = OVS_U128_ZERO; | |
583 | } | |
daf4d3c1 JR |
584 | |
585 | /* Use the original direction tuple if we have it. */ | |
586 | if (conn) { | |
bd5e81a0 | 587 | if (conn->alg_related) { |
f51cf36d | 588 | key = &conn->parent_key; |
bd5e81a0 DB |
589 | } else { |
590 | key = &conn->key; | |
591 | } | |
592 | } else if (alg_exp) { | |
f51cf36d BP |
593 | pkt->md.ct_mark = alg_exp->parent_mark; |
594 | pkt->md.ct_label = alg_exp->parent_label; | |
595 | key = &alg_exp->parent_key; | |
daf4d3c1 | 596 | } |
dec0dbbc | 597 | |
daf4d3c1 | 598 | pkt->md.ct_orig_tuple_ipv6 = false; |
dec0dbbc | 599 | |
daf4d3c1 JR |
600 | if (key) { |
601 | if (key->dl_type == htons(ETH_TYPE_IP)) { | |
602 | pkt->md.ct_orig_tuple.ipv4 = (struct ovs_key_ct_tuple_ipv4) { | |
cda1b109 DB |
603 | key->src.addr.ipv4, |
604 | key->dst.addr.ipv4, | |
daf4d3c1 JR |
605 | key->nw_proto != IPPROTO_ICMP |
606 | ? key->src.port : htons(key->src.icmp_type), | |
607 | key->nw_proto != IPPROTO_ICMP | |
608 | ? key->dst.port : htons(key->src.icmp_code), | |
609 | key->nw_proto, | |
610 | }; | |
286de272 | 611 | } else { |
daf4d3c1 JR |
612 | pkt->md.ct_orig_tuple_ipv6 = true; |
613 | pkt->md.ct_orig_tuple.ipv6 = (struct ovs_key_ct_tuple_ipv6) { | |
cda1b109 DB |
614 | key->src.addr.ipv6, |
615 | key->dst.addr.ipv6, | |
daf4d3c1 JR |
616 | key->nw_proto != IPPROTO_ICMPV6 |
617 | ? key->src.port : htons(key->src.icmp_type), | |
618 | key->nw_proto != IPPROTO_ICMPV6 | |
619 | ? key->dst.port : htons(key->src.icmp_code), | |
620 | key->nw_proto, | |
621 | }; | |
622 | } | |
623 | } else { | |
624 | memset(&pkt->md.ct_orig_tuple, 0, sizeof pkt->md.ct_orig_tuple); | |
625 | } | |
bd5e81a0 DB |
626 | } |
627 | ||
628 | static uint8_t | |
629 | get_ip_proto(const struct dp_packet *pkt) | |
630 | { | |
631 | uint8_t ip_proto; | |
632 | struct eth_header *l2 = dp_packet_eth(pkt); | |
633 | if (l2->eth_type == htons(ETH_TYPE_IPV6)) { | |
634 | struct ovs_16aligned_ip6_hdr *nh6 = dp_packet_l3(pkt); | |
635 | ip_proto = nh6->ip6_ctlun.ip6_un1.ip6_un1_nxt; | |
636 | } else { | |
637 | struct ip_header *l3_hdr = dp_packet_l3(pkt); | |
638 | ip_proto = l3_hdr->ip_proto; | |
639 | } | |
286de272 | 640 | |
bd5e81a0 DB |
641 | return ip_proto; |
642 | } | |
643 | ||
644 | static bool | |
94e71143 | 645 | is_ftp_ctl(const enum ct_alg_ctl_type ct_alg_ctl) |
bd5e81a0 | 646 | { |
94e71143 | 647 | return ct_alg_ctl == CT_ALG_CTL_FTP; |
bd5e81a0 DB |
648 | } |
649 | ||
94e71143 | 650 | static enum ct_alg_ctl_type |
bd7d93f8 DB |
651 | get_alg_ctl_type(const struct dp_packet *pkt, ovs_be16 tp_src, ovs_be16 tp_dst, |
652 | const char *helper) | |
7be77cb0 | 653 | { |
94e71143 DB |
654 | /* CT_IPPORT_FTP/TFTP is used because IPPORT_FTP/TFTP in not defined |
655 | * in OSX, at least in in.h. Since these values will never change, remove | |
7be77cb0 | 656 | * the external dependency. */ |
94e71143 DB |
657 | enum { CT_IPPORT_FTP = 21 }; |
658 | enum { CT_IPPORT_TFTP = 69 }; | |
bd7d93f8 DB |
659 | uint8_t ip_proto = get_ip_proto(pkt); |
660 | struct udp_header *uh = dp_packet_l4(pkt); | |
661 | struct tcp_header *th = dp_packet_l4(pkt); | |
662 | ovs_be16 ftp_src_port = htons(CT_IPPORT_FTP); | |
663 | ovs_be16 ftp_dst_port = htons(CT_IPPORT_FTP); | |
664 | ovs_be16 tftp_dst_port = htons(CT_IPPORT_TFTP); | |
665 | ||
666 | if (OVS_UNLIKELY(tp_dst)) { | |
667 | if (helper && !strncmp(helper, "ftp", strlen("ftp"))) { | |
668 | ftp_dst_port = tp_dst; | |
669 | } else if (helper && !strncmp(helper, "tftp", strlen("tftp"))) { | |
670 | tftp_dst_port = tp_dst; | |
671 | } | |
672 | } else if (OVS_UNLIKELY(tp_src)) { | |
673 | if (helper && !strncmp(helper, "ftp", strlen("ftp"))) { | |
674 | ftp_src_port = tp_src; | |
675 | } | |
676 | } | |
7be77cb0 | 677 | |
bd7d93f8 | 678 | if (ip_proto == IPPROTO_UDP && uh->udp_dst == tftp_dst_port) { |
94e71143 DB |
679 | return CT_ALG_CTL_TFTP; |
680 | } else if (ip_proto == IPPROTO_TCP && | |
bd7d93f8 | 681 | (th->tcp_src == ftp_src_port || th->tcp_dst == ftp_dst_port)) { |
94e71143 DB |
682 | return CT_ALG_CTL_FTP; |
683 | } | |
684 | return CT_ALG_CTL_NONE; | |
685 | } | |
686 | ||
be38342d DB |
687 | static bool |
688 | alg_src_ip_wc(enum ct_alg_ctl_type alg_ctl_type) | |
689 | { | |
690 | if (alg_ctl_type == CT_ALG_CTL_SIP) { | |
691 | return true; | |
692 | } | |
693 | return false; | |
694 | } | |
695 | ||
94e71143 DB |
696 | static void |
697 | handle_alg_ctl(struct conntrack *ct, const struct conn_lookup_ctx *ctx, | |
698 | struct dp_packet *pkt, enum ct_alg_ctl_type ct_alg_ctl, | |
967bb5c5 | 699 | struct conn *conn, long long now, bool nat) |
94e71143 DB |
700 | { |
701 | /* ALG control packet handling with expectation creation. */ | |
3a2a425b | 702 | if (OVS_UNLIKELY(alg_helpers[ct_alg_ctl] && conn && conn->alg)) { |
967bb5c5 DB |
703 | ovs_mutex_lock(&conn->lock); |
704 | alg_helpers[ct_alg_ctl](ct, ctx, pkt, conn, now, CT_FTP_CTL_INTEREST, | |
705 | nat); | |
706 | ovs_mutex_unlock(&conn->lock); | |
94e71143 | 707 | } |
7be77cb0 DB |
708 | } |
709 | ||
286de272 DB |
710 | static void |
711 | pat_packet(struct dp_packet *pkt, const struct conn *conn) | |
712 | { | |
713 | if (conn->nat_info->nat_action & NAT_ACTION_SRC) { | |
714 | if (conn->key.nw_proto == IPPROTO_TCP) { | |
715 | struct tcp_header *th = dp_packet_l4(pkt); | |
716 | packet_set_tcp_port(pkt, conn->rev_key.dst.port, th->tcp_dst); | |
717 | } else if (conn->key.nw_proto == IPPROTO_UDP) { | |
718 | struct udp_header *uh = dp_packet_l4(pkt); | |
719 | packet_set_udp_port(pkt, conn->rev_key.dst.port, uh->udp_dst); | |
720 | } | |
721 | } else if (conn->nat_info->nat_action & NAT_ACTION_DST) { | |
722 | if (conn->key.nw_proto == IPPROTO_TCP) { | |
723 | struct tcp_header *th = dp_packet_l4(pkt); | |
724 | packet_set_tcp_port(pkt, th->tcp_src, conn->rev_key.src.port); | |
725 | } else if (conn->key.nw_proto == IPPROTO_UDP) { | |
726 | struct udp_header *uh = dp_packet_l4(pkt); | |
727 | packet_set_udp_port(pkt, uh->udp_src, conn->rev_key.src.port); | |
728 | } | |
729 | } | |
730 | } | |
731 | ||
732 | static void | |
733 | nat_packet(struct dp_packet *pkt, const struct conn *conn, bool related) | |
734 | { | |
735 | if (conn->nat_info->nat_action & NAT_ACTION_SRC) { | |
736 | pkt->md.ct_state |= CS_SRC_NAT; | |
737 | if (conn->key.dl_type == htons(ETH_TYPE_IP)) { | |
738 | struct ip_header *nh = dp_packet_l3(pkt); | |
739 | packet_set_ipv4_addr(pkt, &nh->ip_src, | |
cda1b109 | 740 | conn->rev_key.dst.addr.ipv4); |
286de272 DB |
741 | } else { |
742 | struct ovs_16aligned_ip6_hdr *nh6 = dp_packet_l3(pkt); | |
743 | packet_set_ipv6_addr(pkt, conn->key.nw_proto, | |
744 | nh6->ip6_src.be32, | |
cda1b109 | 745 | &conn->rev_key.dst.addr.ipv6, true); |
286de272 DB |
746 | } |
747 | if (!related) { | |
748 | pat_packet(pkt, conn); | |
749 | } | |
750 | } else if (conn->nat_info->nat_action & NAT_ACTION_DST) { | |
751 | pkt->md.ct_state |= CS_DST_NAT; | |
752 | if (conn->key.dl_type == htons(ETH_TYPE_IP)) { | |
753 | struct ip_header *nh = dp_packet_l3(pkt); | |
754 | packet_set_ipv4_addr(pkt, &nh->ip_dst, | |
cda1b109 | 755 | conn->rev_key.src.addr.ipv4); |
286de272 DB |
756 | } else { |
757 | struct ovs_16aligned_ip6_hdr *nh6 = dp_packet_l3(pkt); | |
758 | packet_set_ipv6_addr(pkt, conn->key.nw_proto, | |
759 | nh6->ip6_dst.be32, | |
cda1b109 | 760 | &conn->rev_key.src.addr.ipv6, true); |
286de272 DB |
761 | } |
762 | if (!related) { | |
763 | pat_packet(pkt, conn); | |
764 | } | |
765 | } | |
766 | } | |
767 | ||
768 | static void | |
769 | un_pat_packet(struct dp_packet *pkt, const struct conn *conn) | |
770 | { | |
771 | if (conn->nat_info->nat_action & NAT_ACTION_SRC) { | |
772 | if (conn->key.nw_proto == IPPROTO_TCP) { | |
773 | struct tcp_header *th = dp_packet_l4(pkt); | |
774 | packet_set_tcp_port(pkt, th->tcp_src, conn->key.src.port); | |
775 | } else if (conn->key.nw_proto == IPPROTO_UDP) { | |
776 | struct udp_header *uh = dp_packet_l4(pkt); | |
777 | packet_set_udp_port(pkt, uh->udp_src, conn->key.src.port); | |
778 | } | |
779 | } else if (conn->nat_info->nat_action & NAT_ACTION_DST) { | |
780 | if (conn->key.nw_proto == IPPROTO_TCP) { | |
781 | struct tcp_header *th = dp_packet_l4(pkt); | |
782 | packet_set_tcp_port(pkt, conn->key.dst.port, th->tcp_dst); | |
783 | } else if (conn->key.nw_proto == IPPROTO_UDP) { | |
784 | struct udp_header *uh = dp_packet_l4(pkt); | |
785 | packet_set_udp_port(pkt, conn->key.dst.port, uh->udp_dst); | |
786 | } | |
787 | } | |
788 | } | |
789 | ||
edd1bef4 DB |
790 | static void |
791 | reverse_pat_packet(struct dp_packet *pkt, const struct conn *conn) | |
792 | { | |
793 | if (conn->nat_info->nat_action & NAT_ACTION_SRC) { | |
794 | if (conn->key.nw_proto == IPPROTO_TCP) { | |
795 | struct tcp_header *th_in = dp_packet_l4(pkt); | |
796 | packet_set_tcp_port(pkt, conn->key.src.port, | |
797 | th_in->tcp_dst); | |
798 | } else if (conn->key.nw_proto == IPPROTO_UDP) { | |
799 | struct udp_header *uh_in = dp_packet_l4(pkt); | |
800 | packet_set_udp_port(pkt, conn->key.src.port, | |
801 | uh_in->udp_dst); | |
802 | } | |
803 | } else if (conn->nat_info->nat_action & NAT_ACTION_DST) { | |
804 | if (conn->key.nw_proto == IPPROTO_TCP) { | |
805 | struct tcp_header *th_in = dp_packet_l4(pkt); | |
806 | packet_set_tcp_port(pkt, th_in->tcp_src, | |
807 | conn->key.dst.port); | |
808 | } else if (conn->key.nw_proto == IPPROTO_UDP) { | |
809 | struct udp_header *uh_in = dp_packet_l4(pkt); | |
810 | packet_set_udp_port(pkt, uh_in->udp_src, | |
811 | conn->key.dst.port); | |
812 | } | |
813 | } | |
814 | } | |
815 | ||
816 | static void | |
817 | reverse_nat_packet(struct dp_packet *pkt, const struct conn *conn) | |
818 | { | |
819 | char *tail = dp_packet_tail(pkt); | |
ba5ca284 | 820 | uint8_t pad = dp_packet_l2_pad_size(pkt); |
edd1bef4 DB |
821 | struct conn_key inner_key; |
822 | const char *inner_l4 = NULL; | |
823 | uint16_t orig_l3_ofs = pkt->l3_ofs; | |
824 | uint16_t orig_l4_ofs = pkt->l4_ofs; | |
825 | ||
826 | if (conn->key.dl_type == htons(ETH_TYPE_IP)) { | |
827 | struct ip_header *nh = dp_packet_l3(pkt); | |
828 | struct icmp_header *icmp = dp_packet_l4(pkt); | |
829 | struct ip_header *inner_l3 = (struct ip_header *) (icmp + 1); | |
ba5ca284 DB |
830 | /* This call is already verified to succeed during the code path from |
831 | * 'conn_key_extract()' which calls 'extract_l4_icmp()'. */ | |
bd5e81a0 DB |
832 | extract_l3_ipv4(&inner_key, inner_l3, tail - ((char *)inner_l3) - pad, |
833 | &inner_l4, false); | |
edd1bef4 DB |
834 | pkt->l3_ofs += (char *) inner_l3 - (char *) nh; |
835 | pkt->l4_ofs += inner_l4 - (char *) icmp; | |
836 | ||
837 | if (conn->nat_info->nat_action & NAT_ACTION_SRC) { | |
838 | packet_set_ipv4_addr(pkt, &inner_l3->ip_src, | |
cda1b109 | 839 | conn->key.src.addr.ipv4); |
edd1bef4 DB |
840 | } else if (conn->nat_info->nat_action & NAT_ACTION_DST) { |
841 | packet_set_ipv4_addr(pkt, &inner_l3->ip_dst, | |
cda1b109 | 842 | conn->key.dst.addr.ipv4); |
edd1bef4 | 843 | } |
dec0dbbc | 844 | |
edd1bef4 DB |
845 | reverse_pat_packet(pkt, conn); |
846 | icmp->icmp_csum = 0; | |
847 | icmp->icmp_csum = csum(icmp, tail - (char *) icmp - pad); | |
848 | } else { | |
849 | struct ovs_16aligned_ip6_hdr *nh6 = dp_packet_l3(pkt); | |
361a47d6 | 850 | struct icmp6_data_header *icmp6 = dp_packet_l4(pkt); |
edd1bef4 DB |
851 | struct ovs_16aligned_ip6_hdr *inner_l3_6 = |
852 | (struct ovs_16aligned_ip6_hdr *) (icmp6 + 1); | |
ba5ca284 DB |
853 | /* This call is already verified to succeed during the code path from |
854 | * 'conn_key_extract()' which calls 'extract_l4_icmp6()'. */ | |
edd1bef4 DB |
855 | extract_l3_ipv6(&inner_key, inner_l3_6, |
856 | tail - ((char *)inner_l3_6) - pad, | |
857 | &inner_l4); | |
858 | pkt->l3_ofs += (char *) inner_l3_6 - (char *) nh6; | |
859 | pkt->l4_ofs += inner_l4 - (char *) icmp6; | |
860 | ||
861 | if (conn->nat_info->nat_action & NAT_ACTION_SRC) { | |
862 | packet_set_ipv6_addr(pkt, conn->key.nw_proto, | |
863 | inner_l3_6->ip6_src.be32, | |
cda1b109 | 864 | &conn->key.src.addr.ipv6, true); |
edd1bef4 DB |
865 | } else if (conn->nat_info->nat_action & NAT_ACTION_DST) { |
866 | packet_set_ipv6_addr(pkt, conn->key.nw_proto, | |
867 | inner_l3_6->ip6_dst.be32, | |
cda1b109 | 868 | &conn->key.dst.addr.ipv6, true); |
edd1bef4 DB |
869 | } |
870 | reverse_pat_packet(pkt, conn); | |
edd1bef4 | 871 | icmp6->icmp6_base.icmp6_cksum = 0; |
76d85771 DB |
872 | icmp6->icmp6_base.icmp6_cksum = packet_csum_upperlayer6(nh6, icmp6, |
873 | IPPROTO_ICMPV6, tail - (char *) icmp6 - pad); | |
edd1bef4 DB |
874 | } |
875 | pkt->l3_ofs = orig_l3_ofs; | |
876 | pkt->l4_ofs = orig_l4_ofs; | |
877 | } | |
878 | ||
286de272 DB |
879 | static void |
880 | un_nat_packet(struct dp_packet *pkt, const struct conn *conn, | |
881 | bool related) | |
882 | { | |
883 | if (conn->nat_info->nat_action & NAT_ACTION_SRC) { | |
884 | pkt->md.ct_state |= CS_DST_NAT; | |
885 | if (conn->key.dl_type == htons(ETH_TYPE_IP)) { | |
886 | struct ip_header *nh = dp_packet_l3(pkt); | |
887 | packet_set_ipv4_addr(pkt, &nh->ip_dst, | |
cda1b109 | 888 | conn->key.src.addr.ipv4); |
286de272 DB |
889 | } else { |
890 | struct ovs_16aligned_ip6_hdr *nh6 = dp_packet_l3(pkt); | |
891 | packet_set_ipv6_addr(pkt, conn->key.nw_proto, | |
892 | nh6->ip6_dst.be32, | |
cda1b109 | 893 | &conn->key.src.addr.ipv6, true); |
286de272 | 894 | } |
edd1bef4 DB |
895 | |
896 | if (OVS_UNLIKELY(related)) { | |
897 | reverse_nat_packet(pkt, conn); | |
898 | } else { | |
286de272 DB |
899 | un_pat_packet(pkt, conn); |
900 | } | |
901 | } else if (conn->nat_info->nat_action & NAT_ACTION_DST) { | |
902 | pkt->md.ct_state |= CS_SRC_NAT; | |
903 | if (conn->key.dl_type == htons(ETH_TYPE_IP)) { | |
904 | struct ip_header *nh = dp_packet_l3(pkt); | |
905 | packet_set_ipv4_addr(pkt, &nh->ip_src, | |
cda1b109 | 906 | conn->key.dst.addr.ipv4); |
286de272 DB |
907 | } else { |
908 | struct ovs_16aligned_ip6_hdr *nh6 = dp_packet_l3(pkt); | |
909 | packet_set_ipv6_addr(pkt, conn->key.nw_proto, | |
910 | nh6->ip6_src.be32, | |
cda1b109 | 911 | &conn->key.dst.addr.ipv6, true); |
286de272 | 912 | } |
edd1bef4 DB |
913 | |
914 | if (OVS_UNLIKELY(related)) { | |
915 | reverse_nat_packet(pkt, conn); | |
916 | } else { | |
286de272 DB |
917 | un_pat_packet(pkt, conn); |
918 | } | |
919 | } | |
920 | } | |
921 | ||
bd5e81a0 | 922 | static void |
967bb5c5 | 923 | conn_seq_skew_set(struct conntrack *ct, const struct conn *conn_in, |
bd5e81a0 | 924 | long long now, int seq_skew, bool seq_skew_dir) |
967bb5c5 | 925 | OVS_NO_THREAD_SAFETY_ANALYSIS |
bd5e81a0 | 926 | { |
967bb5c5 | 927 | struct conn *conn; |
967bb5c5 | 928 | ovs_mutex_unlock(&conn_in->lock); |
4048c508 | 929 | conn_lookup(ct, &conn_in->key, now, &conn, NULL); |
967bb5c5 DB |
930 | ovs_mutex_lock(&conn_in->lock); |
931 | ||
bd5e81a0 DB |
932 | if (conn && seq_skew) { |
933 | conn->seq_skew = seq_skew; | |
934 | conn->seq_skew_dir = seq_skew_dir; | |
935 | } | |
a720a7fa DB |
936 | } |
937 | ||
3a2a425b DB |
938 | static bool |
939 | ct_verify_helper(const char *helper, enum ct_alg_ctl_type ct_alg_ctl) | |
940 | { | |
941 | if (ct_alg_ctl == CT_ALG_CTL_NONE) { | |
942 | return true; | |
943 | } else if (helper) { | |
944 | if ((ct_alg_ctl == CT_ALG_CTL_FTP) && | |
945 | !strncmp(helper, "ftp", strlen("ftp"))) { | |
946 | return true; | |
947 | } else if ((ct_alg_ctl == CT_ALG_CTL_TFTP) && | |
948 | !strncmp(helper, "tftp", strlen("tftp"))) { | |
949 | return true; | |
950 | } else { | |
951 | return false; | |
952 | } | |
953 | } else { | |
954 | return false; | |
955 | } | |
956 | } | |
957 | ||
a489b168 DDP |
958 | static struct conn * |
959 | conn_not_found(struct conntrack *ct, struct dp_packet *pkt, | |
286de272 DB |
960 | struct conn_lookup_ctx *ctx, bool commit, long long now, |
961 | const struct nat_action_info_t *nat_action_info, | |
967bb5c5 | 962 | const char *helper, const struct alg_exp_node *alg_exp, |
2078901a | 963 | enum ct_alg_ctl_type ct_alg_ctl, uint32_t tp_id) |
967bb5c5 | 964 | OVS_REQUIRES(ct->ct_lock) |
a489b168 | 965 | { |
a489b168 | 966 | struct conn *nc = NULL; |
967bb5c5 | 967 | struct conn *nat_conn = NULL; |
a489b168 DDP |
968 | |
969 | if (!valid_new(pkt, &ctx->key)) { | |
286de272 | 970 | pkt->md.ct_state = CS_INVALID; |
a489b168 DDP |
971 | return nc; |
972 | } | |
dec0dbbc | 973 | |
286de272 | 974 | pkt->md.ct_state = CS_NEW; |
dec0dbbc | 975 | |
bd5e81a0 DB |
976 | if (alg_exp) { |
977 | pkt->md.ct_state |= CS_RELATED; | |
978 | } | |
a489b168 DDP |
979 | |
980 | if (commit) { | |
a7f33fdb DB |
981 | struct zone_limit *zl = zone_limit_lookup_or_default(ct, |
982 | ctx->key.zone); | |
983 | if (zl && zl->czl.count >= zl->czl.limit) { | |
984 | return nc; | |
985 | } | |
986 | ||
a489b168 | 987 | unsigned int n_conn_limit; |
a489b168 | 988 | atomic_read_relaxed(&ct->n_conn_limit, &n_conn_limit); |
a489b168 DDP |
989 | if (atomic_count_get(&ct->n_conn) >= n_conn_limit) { |
990 | COVERAGE_INC(conntrack_full); | |
991 | return nc; | |
992 | } | |
993 | ||
2078901a | 994 | nc = new_conn(ct, pkt, &ctx->key, now, tp_id); |
a720a7fa | 995 | memcpy(&nc->key, &ctx->key, sizeof nc->key); |
82b9ac94 | 996 | memcpy(&nc->rev_key, &nc->key, sizeof nc->rev_key); |
286de272 | 997 | conn_key_reverse(&nc->rev_key); |
a489b168 | 998 | |
3a2a425b DB |
999 | if (ct_verify_helper(helper, ct_alg_ctl)) { |
1000 | nc->alg = nullable_xstrdup(helper); | |
bd5e81a0 DB |
1001 | } |
1002 | ||
1003 | if (alg_exp) { | |
1004 | nc->alg_related = true; | |
f51cf36d BP |
1005 | nc->mark = alg_exp->parent_mark; |
1006 | nc->label = alg_exp->parent_label; | |
1007 | nc->parent_key = alg_exp->parent_key; | |
bd5e81a0 DB |
1008 | } |
1009 | ||
286de272 DB |
1010 | if (nat_action_info) { |
1011 | nc->nat_info = xmemdup(nat_action_info, sizeof *nc->nat_info); | |
967bb5c5 | 1012 | nat_conn = xzalloc(sizeof *nat_conn); |
a489b168 | 1013 | |
bd5e81a0 | 1014 | if (alg_exp) { |
be38342d | 1015 | if (alg_exp->nat_rpl_dst) { |
bd5e81a0 DB |
1016 | nc->rev_key.dst.addr = alg_exp->alg_nat_repl_addr; |
1017 | nc->nat_info->nat_action = NAT_ACTION_SRC; | |
1018 | } else { | |
1019 | nc->rev_key.src.addr = alg_exp->alg_nat_repl_addr; | |
1020 | nc->nat_info->nat_action = NAT_ACTION_DST; | |
1021 | } | |
bd5e81a0 | 1022 | } else { |
967bb5c5 DB |
1023 | memcpy(nat_conn, nc, sizeof *nat_conn); |
1024 | bool nat_res = nat_select_range_tuple(ct, nc, nat_conn); | |
286de272 | 1025 | |
bd5e81a0 DB |
1026 | if (!nat_res) { |
1027 | goto nat_res_exhaustion; | |
1028 | } | |
286de272 | 1029 | |
967bb5c5 DB |
1030 | /* Update nc with nat adjustments made to nat_conn by |
1031 | * nat_select_range_tuple(). */ | |
1032 | memcpy(nc, nat_conn, sizeof *nc); | |
286de272 | 1033 | } |
967bb5c5 | 1034 | |
dbb597d3 | 1035 | nat_packet(pkt, nc, ctx->icmp_related); |
967bb5c5 DB |
1036 | memcpy(&nat_conn->key, &nc->rev_key, sizeof nat_conn->key); |
1037 | memcpy(&nat_conn->rev_key, &nc->key, sizeof nat_conn->rev_key); | |
1038 | nat_conn->conn_type = CT_CONN_TYPE_UN_NAT; | |
1039 | nat_conn->nat_info = NULL; | |
1040 | nat_conn->alg = NULL; | |
1041 | nat_conn->nat_conn = NULL; | |
1042 | uint32_t nat_hash = conn_key_hash(&nat_conn->key, ct->hash_basis); | |
1043 | cmap_insert(&ct->conns, &nat_conn->cm_node, nat_hash); | |
1044 | } | |
1045 | ||
1046 | nc->nat_conn = nat_conn; | |
1047 | ovs_mutex_init_adaptive(&nc->lock); | |
1048 | nc->conn_type = CT_CONN_TYPE_DEFAULT; | |
1049 | cmap_insert(&ct->conns, &nc->cm_node, ctx->hash); | |
a489b168 | 1050 | atomic_count_inc(&ct->n_conn); |
967bb5c5 | 1051 | ctx->conn = nc; /* For completeness. */ |
a7f33fdb DB |
1052 | if (zl) { |
1053 | nc->admit_zone = zl->czl.zone; | |
1054 | nc->zone_limit_seq = zl->czl.zone_limit_seq; | |
1055 | zl->czl.count++; | |
1056 | } else { | |
1057 | nc->admit_zone = INVALID_ZONE; | |
1058 | } | |
a489b168 | 1059 | } |
bd5e81a0 | 1060 | |
a489b168 | 1061 | return nc; |
bd5e81a0 | 1062 | |
967bb5c5 DB |
1063 | /* This would be a user error or a DOS attack. A user error is prevented |
1064 | * by allocating enough combinations of NAT addresses when combined with | |
1065 | * ephemeral ports. A DOS attack should be protected against with | |
1066 | * firewall rules or a separate firewall. Also using zone partitioning | |
1067 | * can limit DoS impact. */ | |
bd5e81a0 | 1068 | nat_res_exhaustion: |
967bb5c5 DB |
1069 | free(nat_conn); |
1070 | ovs_list_remove(&nc->exp_node); | |
1071 | delete_conn_cmn(nc); | |
bd5e81a0 DB |
1072 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5); |
1073 | VLOG_WARN_RL(&rl, "Unable to NAT due to tuple space exhaustion - " | |
1074 | "if DoS attack, use firewalling and/or zone partitioning."); | |
1075 | return NULL; | |
a489b168 DDP |
1076 | } |
1077 | ||
286de272 DB |
1078 | static bool |
1079 | conn_update_state(struct conntrack *ct, struct dp_packet *pkt, | |
967bb5c5 DB |
1080 | struct conn_lookup_ctx *ctx, struct conn *conn, |
1081 | long long now) | |
286de272 | 1082 | { |
967bb5c5 | 1083 | ovs_assert(conn->conn_type == CT_CONN_TYPE_DEFAULT); |
286de272 DB |
1084 | bool create_new_conn = false; |
1085 | ||
dbb597d3 | 1086 | if (ctx->icmp_related) { |
286de272 DB |
1087 | pkt->md.ct_state |= CS_RELATED; |
1088 | if (ctx->reply) { | |
1089 | pkt->md.ct_state |= CS_REPLY_DIR; | |
1090 | } | |
1091 | } else { | |
967bb5c5 | 1092 | if (conn->alg_related) { |
bd5e81a0 DB |
1093 | pkt->md.ct_state |= CS_RELATED; |
1094 | } | |
dec0dbbc | 1095 | |
967bb5c5 | 1096 | enum ct_update_res res = conn_update(ct, conn, pkt, ctx, now); |
286de272 DB |
1097 | |
1098 | switch (res) { | |
1099 | case CT_UPDATE_VALID: | |
1100 | pkt->md.ct_state |= CS_ESTABLISHED; | |
1101 | pkt->md.ct_state &= ~CS_NEW; | |
1102 | if (ctx->reply) { | |
1103 | pkt->md.ct_state |= CS_REPLY_DIR; | |
1104 | } | |
1105 | break; | |
1106 | case CT_UPDATE_INVALID: | |
1107 | pkt->md.ct_state = CS_INVALID; | |
1108 | break; | |
1109 | case CT_UPDATE_NEW: | |
967bb5c5 | 1110 | ovs_mutex_lock(&ct->ct_lock); |
4048c508 | 1111 | if (conn_lookup(ct, &conn->key, now, NULL, NULL)) { |
28274f77 DB |
1112 | conn_clean(ct, conn); |
1113 | } | |
967bb5c5 | 1114 | ovs_mutex_unlock(&ct->ct_lock); |
286de272 DB |
1115 | create_new_conn = true; |
1116 | break; | |
a867c010 YHW |
1117 | case CT_UPDATE_VALID_NEW: |
1118 | pkt->md.ct_state |= CS_NEW; | |
1119 | break; | |
286de272 DB |
1120 | default: |
1121 | OVS_NOT_REACHED(); | |
1122 | } | |
1123 | } | |
1124 | return create_new_conn; | |
1125 | } | |
1126 | ||
286de272 DB |
1127 | static void |
1128 | handle_nat(struct dp_packet *pkt, struct conn *conn, | |
1129 | uint16_t zone, bool reply, bool related) | |
1130 | { | |
1131 | if (conn->nat_info && | |
1132 | (!(pkt->md.ct_state & (CS_SRC_NAT | CS_DST_NAT)) || | |
1133 | (pkt->md.ct_state & (CS_SRC_NAT | CS_DST_NAT) && | |
1134 | zone != pkt->md.ct_zone))) { | |
bd5e81a0 | 1135 | |
286de272 DB |
1136 | if (pkt->md.ct_state & (CS_SRC_NAT | CS_DST_NAT)) { |
1137 | pkt->md.ct_state &= ~(CS_SRC_NAT | CS_DST_NAT); | |
1138 | } | |
1139 | if (reply) { | |
1140 | un_nat_packet(pkt, conn, related); | |
1141 | } else { | |
1142 | nat_packet(pkt, conn, related); | |
1143 | } | |
1144 | } | |
1145 | } | |
1146 | ||
f8016041 DB |
1147 | static bool |
1148 | check_orig_tuple(struct conntrack *ct, struct dp_packet *pkt, | |
1149 | struct conn_lookup_ctx *ctx_in, long long now, | |
967bb5c5 | 1150 | struct conn **conn, |
f8016041 | 1151 | const struct nat_action_info_t *nat_action_info) |
f8016041 | 1152 | { |
a0b89c51 DB |
1153 | if (!(pkt->md.ct_state & (CS_SRC_NAT | CS_DST_NAT)) || |
1154 | (ctx_in->key.dl_type == htons(ETH_TYPE_IP) && | |
f8016041 DB |
1155 | !pkt->md.ct_orig_tuple.ipv4.ipv4_proto) || |
1156 | (ctx_in->key.dl_type == htons(ETH_TYPE_IPV6) && | |
1157 | !pkt->md.ct_orig_tuple.ipv6.ipv6_proto) || | |
f8016041 DB |
1158 | nat_action_info) { |
1159 | return false; | |
1160 | } | |
1161 | ||
967bb5c5 DB |
1162 | struct conn_key key; |
1163 | memset(&key, 0 , sizeof key); | |
f8016041 DB |
1164 | |
1165 | if (ctx_in->key.dl_type == htons(ETH_TYPE_IP)) { | |
967bb5c5 DB |
1166 | key.src.addr.ipv4 = pkt->md.ct_orig_tuple.ipv4.ipv4_src; |
1167 | key.dst.addr.ipv4 = pkt->md.ct_orig_tuple.ipv4.ipv4_dst; | |
f8016041 DB |
1168 | |
1169 | if (ctx_in->key.nw_proto == IPPROTO_ICMP) { | |
967bb5c5 DB |
1170 | key.src.icmp_id = ctx_in->key.src.icmp_id; |
1171 | key.dst.icmp_id = ctx_in->key.dst.icmp_id; | |
f8016041 | 1172 | uint16_t src_port = ntohs(pkt->md.ct_orig_tuple.ipv4.src_port); |
967bb5c5 DB |
1173 | key.src.icmp_type = (uint8_t) src_port; |
1174 | key.dst.icmp_type = reverse_icmp_type(key.src.icmp_type); | |
f8016041 | 1175 | } else { |
967bb5c5 DB |
1176 | key.src.port = pkt->md.ct_orig_tuple.ipv4.src_port; |
1177 | key.dst.port = pkt->md.ct_orig_tuple.ipv4.dst_port; | |
f8016041 | 1178 | } |
967bb5c5 | 1179 | key.nw_proto = pkt->md.ct_orig_tuple.ipv4.ipv4_proto; |
f8016041 | 1180 | } else { |
967bb5c5 DB |
1181 | key.src.addr.ipv6 = pkt->md.ct_orig_tuple.ipv6.ipv6_src; |
1182 | key.dst.addr.ipv6 = pkt->md.ct_orig_tuple.ipv6.ipv6_dst; | |
f8016041 DB |
1183 | |
1184 | if (ctx_in->key.nw_proto == IPPROTO_ICMPV6) { | |
967bb5c5 DB |
1185 | key.src.icmp_id = ctx_in->key.src.icmp_id; |
1186 | key.dst.icmp_id = ctx_in->key.dst.icmp_id; | |
f8016041 | 1187 | uint16_t src_port = ntohs(pkt->md.ct_orig_tuple.ipv6.src_port); |
967bb5c5 DB |
1188 | key.src.icmp_type = (uint8_t) src_port; |
1189 | key.dst.icmp_type = reverse_icmp6_type(key.src.icmp_type); | |
f8016041 | 1190 | } else { |
967bb5c5 DB |
1191 | key.src.port = pkt->md.ct_orig_tuple.ipv6.src_port; |
1192 | key.dst.port = pkt->md.ct_orig_tuple.ipv6.dst_port; | |
f8016041 | 1193 | } |
967bb5c5 | 1194 | key.nw_proto = pkt->md.ct_orig_tuple.ipv6.ipv6_proto; |
f8016041 DB |
1195 | } |
1196 | ||
967bb5c5 DB |
1197 | key.dl_type = ctx_in->key.dl_type; |
1198 | key.zone = pkt->md.ct_zone; | |
4048c508 | 1199 | conn_lookup(ct, &key, now, conn, NULL); |
f8016041 DB |
1200 | return *conn ? true : false; |
1201 | } | |
1202 | ||
94e71143 DB |
1203 | static bool |
1204 | conn_update_state_alg(struct conntrack *ct, struct dp_packet *pkt, | |
1205 | struct conn_lookup_ctx *ctx, struct conn *conn, | |
1206 | const struct nat_action_info_t *nat_action_info, | |
1207 | enum ct_alg_ctl_type ct_alg_ctl, long long now, | |
967bb5c5 | 1208 | bool *create_new_conn) |
94e71143 DB |
1209 | { |
1210 | if (is_ftp_ctl(ct_alg_ctl)) { | |
1211 | /* Keep sequence tracking in sync with the source of the | |
1212 | * sequence skew. */ | |
967bb5c5 | 1213 | ovs_mutex_lock(&conn->lock); |
94e71143 DB |
1214 | if (ctx->reply != conn->seq_skew_dir) { |
1215 | handle_ftp_ctl(ct, ctx, pkt, conn, now, CT_FTP_CTL_OTHER, | |
1216 | !!nat_action_info); | |
967bb5c5 DB |
1217 | /* conn_update_state locks for unrelated fields, so unlock. */ |
1218 | ovs_mutex_unlock(&conn->lock); | |
1219 | *create_new_conn = conn_update_state(ct, pkt, ctx, conn, now); | |
94e71143 | 1220 | } else { |
967bb5c5 DB |
1221 | /* conn_update_state locks for unrelated fields, so unlock. */ |
1222 | ovs_mutex_unlock(&conn->lock); | |
1223 | *create_new_conn = conn_update_state(ct, pkt, ctx, conn, now); | |
1224 | ovs_mutex_lock(&conn->lock); | |
030958a0 DB |
1225 | if (*create_new_conn == false) { |
1226 | handle_ftp_ctl(ct, ctx, pkt, conn, now, CT_FTP_CTL_OTHER, | |
1227 | !!nat_action_info); | |
1228 | } | |
967bb5c5 | 1229 | ovs_mutex_unlock(&conn->lock); |
94e71143 DB |
1230 | } |
1231 | return true; | |
1232 | } | |
1233 | return false; | |
1234 | } | |
1235 | ||
594570ea DB |
1236 | static void |
1237 | set_cached_conn(const struct nat_action_info_t *nat_action_info, | |
1238 | const struct conn_lookup_ctx *ctx, struct conn *conn, | |
1239 | struct dp_packet *pkt) | |
1240 | { | |
1241 | if (OVS_LIKELY(!nat_action_info)) { | |
1242 | pkt->md.conn = conn; | |
1243 | pkt->md.reply = ctx->reply; | |
1244 | pkt->md.icmp_related = ctx->icmp_related; | |
1245 | } else { | |
1246 | pkt->md.conn = NULL; | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | static void | |
1251 | process_one_fast(uint16_t zone, const uint32_t *setmark, | |
1252 | const struct ovs_key_ct_labels *setlabel, | |
1253 | const struct nat_action_info_t *nat_action_info, | |
1254 | struct conn *conn, struct dp_packet *pkt) | |
1255 | { | |
1256 | if (nat_action_info) { | |
1257 | handle_nat(pkt, conn, zone, pkt->md.reply, pkt->md.icmp_related); | |
1258 | pkt->md.conn = NULL; | |
1259 | } | |
1260 | ||
1261 | pkt->md.ct_zone = zone; | |
1262 | ovs_mutex_lock(&conn->lock); | |
1263 | pkt->md.ct_mark = conn->mark; | |
1264 | pkt->md.ct_label = conn->label; | |
1265 | ovs_mutex_unlock(&conn->lock); | |
1266 | ||
1267 | if (setmark) { | |
1268 | set_mark(pkt, conn, setmark[0], setmark[1]); | |
1269 | } | |
1270 | ||
1271 | if (setlabel) { | |
1272 | set_label(pkt, conn, &setlabel[0], &setlabel[1]); | |
1273 | } | |
1274 | } | |
1275 | ||
286de272 | 1276 | static void |
a489b168 DDP |
1277 | process_one(struct conntrack *ct, struct dp_packet *pkt, |
1278 | struct conn_lookup_ctx *ctx, uint16_t zone, | |
286de272 DB |
1279 | bool force, bool commit, long long now, const uint32_t *setmark, |
1280 | const struct ovs_key_ct_labels *setlabel, | |
bd5e81a0 | 1281 | const struct nat_action_info_t *nat_action_info, |
2078901a WT |
1282 | ovs_be16 tp_src, ovs_be16 tp_dst, const char *helper, |
1283 | uint32_t tp_id) | |
a489b168 | 1284 | { |
af8169b4 DC |
1285 | /* Reset ct_state whenever entering a new zone. */ |
1286 | if (pkt->md.ct_state && pkt->md.ct_zone != zone) { | |
1287 | pkt->md.ct_state = 0; | |
1288 | } | |
1289 | ||
967bb5c5 DB |
1290 | bool create_new_conn = false; |
1291 | conn_key_lookup(ct, &ctx->key, ctx->hash, now, &ctx->conn, &ctx->reply); | |
1292 | struct conn *conn = ctx->conn; | |
a489b168 | 1293 | |
a76a37ef | 1294 | /* Delete found entry if in wrong direction. 'force' implies commit. */ |
a720a7fa | 1295 | if (OVS_UNLIKELY(force && ctx->reply && conn)) { |
967bb5c5 | 1296 | ovs_mutex_lock(&ct->ct_lock); |
4048c508 | 1297 | if (conn_lookup(ct, &conn->key, now, NULL, NULL)) { |
28274f77 DB |
1298 | conn_clean(ct, conn); |
1299 | } | |
967bb5c5 | 1300 | ovs_mutex_unlock(&ct->ct_lock); |
a76a37ef JR |
1301 | conn = NULL; |
1302 | } | |
1303 | ||
286de272 DB |
1304 | if (OVS_LIKELY(conn)) { |
1305 | if (conn->conn_type == CT_CONN_TYPE_UN_NAT) { | |
a489b168 | 1306 | |
286de272 | 1307 | ctx->reply = true; |
967bb5c5 | 1308 | struct conn *rev_conn = conn; /* Save for debugging. */ |
4048c508 | 1309 | uint32_t hash = conn_key_hash(&conn->rev_key, ct->hash_basis); |
967bb5c5 | 1310 | conn_key_lookup(ct, &ctx->key, hash, now, &conn, &ctx->reply); |
a489b168 | 1311 | |
967bb5c5 | 1312 | if (!conn) { |
af8169b4 DC |
1313 | pkt->md.ct_state |= CS_INVALID; |
1314 | write_ct_md(pkt, zone, NULL, NULL, NULL); | |
f51cf36d | 1315 | char *log_msg = xasprintf("Missing parent conn %p", rev_conn); |
9a8a18f9 | 1316 | ct_print_conn_info(rev_conn, log_msg, VLL_INFO, true, true); |
967bb5c5 | 1317 | free(log_msg); |
286de272 | 1318 | return; |
a489b168 DDP |
1319 | } |
1320 | } | |
286de272 DB |
1321 | } |
1322 | ||
bd7d93f8 DB |
1323 | enum ct_alg_ctl_type ct_alg_ctl = get_alg_ctl_type(pkt, tp_src, tp_dst, |
1324 | helper); | |
bd5e81a0 | 1325 | |
286de272 | 1326 | if (OVS_LIKELY(conn)) { |
94e71143 DB |
1327 | if (OVS_LIKELY(!conn_update_state_alg(ct, pkt, ctx, conn, |
1328 | nat_action_info, | |
967bb5c5 | 1329 | ct_alg_ctl, now, |
94e71143 | 1330 | &create_new_conn))) { |
967bb5c5 | 1331 | create_new_conn = conn_update_state(ct, pkt, ctx, conn, now); |
bd5e81a0 | 1332 | } |
286de272 | 1333 | if (nat_action_info && !create_new_conn) { |
dbb597d3 | 1334 | handle_nat(pkt, conn, zone, ctx->reply, ctx->icmp_related); |
286de272 | 1335 | } |
bd5e81a0 | 1336 | |
a0b89c51 | 1337 | } else if (check_orig_tuple(ct, pkt, ctx, now, &conn, nat_action_info)) { |
967bb5c5 | 1338 | create_new_conn = conn_update_state(ct, pkt, ctx, conn, now); |
a489b168 | 1339 | } else { |
dbb597d3 | 1340 | if (ctx->icmp_related) { |
bd5e81a0 DB |
1341 | /* An icmp related conn should always be found; no new |
1342 | connection is created based on an icmp related packet. */ | |
286de272 | 1343 | pkt->md.ct_state = CS_INVALID; |
5c2e106b | 1344 | } else { |
286de272 | 1345 | create_new_conn = true; |
5c2e106b | 1346 | } |
a489b168 DDP |
1347 | } |
1348 | ||
bd5e81a0 | 1349 | const struct alg_exp_node *alg_exp = NULL; |
96bbcbf7 | 1350 | struct alg_exp_node alg_exp_entry; |
dec0dbbc | 1351 | |
286de272 | 1352 | if (OVS_UNLIKELY(create_new_conn)) { |
bd5e81a0 | 1353 | |
967bb5c5 | 1354 | ovs_rwlock_rdlock(&ct->resources_lock); |
bd5e81a0 | 1355 | alg_exp = expectation_lookup(&ct->alg_expectations, &ctx->key, |
be38342d DB |
1356 | ct->hash_basis, |
1357 | alg_src_ip_wc(ct_alg_ctl)); | |
bd5e81a0 | 1358 | if (alg_exp) { |
c3f6bae2 | 1359 | memcpy(&alg_exp_entry, alg_exp, sizeof alg_exp_entry); |
bd5e81a0 DB |
1360 | alg_exp = &alg_exp_entry; |
1361 | } | |
967bb5c5 | 1362 | ovs_rwlock_unlock(&ct->resources_lock); |
bd5e81a0 | 1363 | |
967bb5c5 | 1364 | ovs_mutex_lock(&ct->ct_lock); |
4048c508 | 1365 | if (!conn_lookup(ct, &ctx->key, now, NULL, NULL)) { |
28274f77 | 1366 | conn = conn_not_found(ct, pkt, ctx, commit, now, nat_action_info, |
2078901a | 1367 | helper, alg_exp, ct_alg_ctl, tp_id); |
28274f77 | 1368 | } |
967bb5c5 | 1369 | ovs_mutex_unlock(&ct->ct_lock); |
286de272 DB |
1370 | } |
1371 | ||
bd5e81a0 DB |
1372 | write_ct_md(pkt, zone, conn, &ctx->key, alg_exp); |
1373 | ||
286de272 DB |
1374 | if (conn && setmark) { |
1375 | set_mark(pkt, conn, setmark[0], setmark[1]); | |
1376 | } | |
a489b168 | 1377 | |
286de272 DB |
1378 | if (conn && setlabel) { |
1379 | set_label(pkt, conn, &setlabel[0], &setlabel[1]); | |
1380 | } | |
1381 | ||
967bb5c5 | 1382 | handle_alg_ctl(ct, ctx, pkt, ct_alg_ctl, conn, now, !!nat_action_info); |
594570ea DB |
1383 | |
1384 | set_cached_conn(nat_action_info, ctx, conn, pkt); | |
a489b168 DDP |
1385 | } |
1386 | ||
1387 | /* Sends the packets in '*pkt_batch' through the connection tracker 'ct'. All | |
51b9a533 | 1388 | * the packets must have the same 'dl_type' (IPv4 or IPv6) and should have |
4ea96698 DB |
1389 | * the l3 and and l4 offset properly set. Performs fragment reassembly with |
1390 | * the help of ipf_preprocess_conntrack(). | |
a489b168 DDP |
1391 | * |
1392 | * If 'commit' is true, the packets are allowed to create new entries in the | |
1393 | * connection tables. 'setmark', if not NULL, should point to a two | |
1394 | * elements array containing a value and a mask to set the connection mark. | |
1395 | * 'setlabel' behaves similarly for the connection label.*/ | |
1396 | int | |
1397 | conntrack_execute(struct conntrack *ct, struct dp_packet_batch *pkt_batch, | |
a76a37ef | 1398 | ovs_be16 dl_type, bool force, bool commit, uint16_t zone, |
66e4ad8a | 1399 | const uint32_t *setmark, |
a489b168 | 1400 | const struct ovs_key_ct_labels *setlabel, |
bd7d93f8 | 1401 | ovs_be16 tp_src, ovs_be16 tp_dst, const char *helper, |
94053e66 | 1402 | const struct nat_action_info_t *nat_action_info, |
2078901a | 1403 | long long now, uint32_t tp_id) |
a489b168 | 1404 | { |
4ea96698 DB |
1405 | ipf_preprocess_conntrack(ct->ipf, pkt_batch, now, dl_type, zone, |
1406 | ct->hash_basis); | |
1407 | ||
43495c45 | 1408 | struct dp_packet *packet; |
61ce32b9 | 1409 | struct conn_lookup_ctx ctx; |
a489b168 | 1410 | |
e883448e | 1411 | DP_PACKET_BATCH_FOR_EACH (i, packet, pkt_batch) { |
594570ea DB |
1412 | struct conn *conn = packet->md.conn; |
1413 | if (OVS_UNLIKELY(packet->md.ct_state == CS_INVALID)) { | |
1414 | write_ct_md(packet, zone, NULL, NULL, NULL); | |
1415 | } else if (conn && conn->key.zone == zone && !force | |
1416 | && !get_alg_ctl_type(packet, tp_src, tp_dst, helper)) { | |
1417 | process_one_fast(zone, setmark, setlabel, nat_action_info, | |
1418 | conn, packet); | |
1419 | } else if (OVS_UNLIKELY(!conn_key_extract(ct, packet, dl_type, &ctx, | |
1420 | zone))) { | |
43495c45 BB |
1421 | packet->md.ct_state = CS_INVALID; |
1422 | write_ct_md(packet, zone, NULL, NULL, NULL); | |
594570ea DB |
1423 | } else { |
1424 | process_one(ct, packet, &ctx, zone, force, commit, now, setmark, | |
2078901a WT |
1425 | setlabel, nat_action_info, tp_src, tp_dst, helper, |
1426 | tp_id); | |
a489b168 | 1427 | } |
a489b168 DDP |
1428 | } |
1429 | ||
4ea96698 DB |
1430 | ipf_postprocess_conntrack(ct->ipf, pkt_batch, now, dl_type); |
1431 | ||
a489b168 DDP |
1432 | return 0; |
1433 | } | |
1434 | ||
1fe178d2 EG |
1435 | void |
1436 | conntrack_clear(struct dp_packet *packet) | |
1437 | { | |
1438 | /* According to pkt_metadata_init(), ct_state == 0 is enough to make all of | |
1439 | * the conntrack fields invalid. */ | |
1440 | packet->md.ct_state = 0; | |
594570ea | 1441 | pkt_metadata_init_conn(&packet->md); |
1fe178d2 EG |
1442 | } |
1443 | ||
a489b168 DDP |
1444 | static void |
1445 | set_mark(struct dp_packet *pkt, struct conn *conn, uint32_t val, uint32_t mask) | |
1446 | { | |
967bb5c5 | 1447 | ovs_mutex_lock(&conn->lock); |
bd5e81a0 DB |
1448 | if (conn->alg_related) { |
1449 | pkt->md.ct_mark = conn->mark; | |
1450 | } else { | |
1451 | pkt->md.ct_mark = val | (pkt->md.ct_mark & ~(mask)); | |
1452 | conn->mark = pkt->md.ct_mark; | |
1453 | } | |
967bb5c5 | 1454 | ovs_mutex_unlock(&conn->lock); |
a489b168 DDP |
1455 | } |
1456 | ||
1457 | static void | |
1458 | set_label(struct dp_packet *pkt, struct conn *conn, | |
1459 | const struct ovs_key_ct_labels *val, | |
1460 | const struct ovs_key_ct_labels *mask) | |
1461 | { | |
967bb5c5 | 1462 | ovs_mutex_lock(&conn->lock); |
bd5e81a0 DB |
1463 | if (conn->alg_related) { |
1464 | pkt->md.ct_label = conn->label; | |
1465 | } else { | |
1466 | ovs_u128 v, m; | |
a489b168 | 1467 | |
bd5e81a0 DB |
1468 | memcpy(&v, val, sizeof v); |
1469 | memcpy(&m, mask, sizeof m); | |
a489b168 | 1470 | |
bd5e81a0 | 1471 | pkt->md.ct_label.u64.lo = v.u64.lo |
a489b168 | 1472 | | (pkt->md.ct_label.u64.lo & ~(m.u64.lo)); |
bd5e81a0 | 1473 | pkt->md.ct_label.u64.hi = v.u64.hi |
a489b168 | 1474 | | (pkt->md.ct_label.u64.hi & ~(m.u64.hi)); |
bd5e81a0 DB |
1475 | conn->label = pkt->md.ct_label; |
1476 | } | |
967bb5c5 | 1477 | ovs_mutex_unlock(&conn->lock); |
a489b168 | 1478 | } |
286de272 | 1479 | |
a489b168 | 1480 | \f |
e6ef6cc6 DDP |
1481 | /* Delete the expired connections from 'ctb', up to 'limit'. Returns the |
1482 | * earliest expiration time among the remaining connections in 'ctb'. Returns | |
1483 | * LLONG_MAX if 'ctb' is empty. The return value might be smaller than 'now', | |
1484 | * if 'limit' is reached */ | |
1485 | static long long | |
967bb5c5 | 1486 | ct_sweep(struct conntrack *ct, long long now, size_t limit) |
e6ef6cc6 DDP |
1487 | { |
1488 | struct conn *conn, *next; | |
1489 | long long min_expiration = LLONG_MAX; | |
e6ef6cc6 DDP |
1490 | size_t count = 0; |
1491 | ||
967bb5c5 DB |
1492 | ovs_mutex_lock(&ct->ct_lock); |
1493 | ||
dec0dbbc | 1494 | for (unsigned i = 0; i < N_CT_TM; i++) { |
967bb5c5 DB |
1495 | LIST_FOR_EACH_SAFE (conn, next, exp_node, &ct->exp_lists[i]) { |
1496 | ovs_mutex_lock(&conn->lock); | |
1497 | if (now < conn->expiration || count >= limit) { | |
a720a7fa | 1498 | min_expiration = MIN(min_expiration, conn->expiration); |
967bb5c5 | 1499 | ovs_mutex_unlock(&conn->lock); |
a720a7fa DB |
1500 | if (count >= limit) { |
1501 | /* Do not check other lists. */ | |
1502 | COVERAGE_INC(conntrack_long_cleanup); | |
967bb5c5 | 1503 | goto out; |
e6ef6cc6 | 1504 | } |
a720a7fa | 1505 | break; |
967bb5c5 DB |
1506 | } else { |
1507 | ovs_mutex_unlock(&conn->lock); | |
1508 | conn_clean(ct, conn); | |
e6ef6cc6 | 1509 | } |
a720a7fa | 1510 | count++; |
e6ef6cc6 DDP |
1511 | } |
1512 | } | |
967bb5c5 DB |
1513 | |
1514 | out: | |
1515 | VLOG_DBG("conntrack cleanup %"PRIuSIZE" entries in %lld msec", count, | |
1516 | time_msec() - now); | |
1517 | ovs_mutex_unlock(&ct->ct_lock); | |
e6ef6cc6 DDP |
1518 | return min_expiration; |
1519 | } | |
1520 | ||
1521 | /* Cleans up old connection entries from 'ct'. Returns the time when the | |
1522 | * next expiration might happen. The return value might be smaller than | |
1523 | * 'now', meaning that an internal limit has been reached, and some expired | |
1524 | * connections have not been deleted. */ | |
1525 | static long long | |
1526 | conntrack_clean(struct conntrack *ct, long long now) | |
1527 | { | |
e6ef6cc6 | 1528 | unsigned int n_conn_limit; |
e6ef6cc6 | 1529 | atomic_read_relaxed(&ct->n_conn_limit, &n_conn_limit); |
967bb5c5 DB |
1530 | size_t clean_max = n_conn_limit > 10 ? n_conn_limit / 10 : 1; |
1531 | long long min_exp = ct_sweep(ct, now, clean_max); | |
2078901a | 1532 | long long next_wakeup = MIN(min_exp, now + CT_DPIF_NETDEV_TP_MIN); |
e6ef6cc6 DDP |
1533 | |
1534 | return next_wakeup; | |
1535 | } | |
1536 | ||
1537 | /* Cleanup: | |
e6ef6cc6 DDP |
1538 | * |
1539 | * We must call conntrack_clean() periodically. conntrack_clean() return | |
1540 | * value gives an hint on when the next cleanup must be done (either because | |
1541 | * there is an actual connection that expires, or because a new connection | |
1542 | * might be created with the minimum timeout). | |
1543 | * | |
1544 | * The logic below has two goals: | |
1545 | * | |
6c54734e DDP |
1546 | * - We want to reduce the number of wakeups and batch connection cleanup |
1547 | * when the load is not very high. CT_CLEAN_INTERVAL ensures that if we | |
1548 | * are coping with the current cleanup tasks, then we wait at least | |
1549 | * 5 seconds to do further cleanup. | |
e6ef6cc6 | 1550 | * |
967bb5c5 | 1551 | * - We don't want to keep the map locked too long, as we might prevent |
6c54734e | 1552 | * traffic from flowing. CT_CLEAN_MIN_INTERVAL ensures that if cleanup is |
967bb5c5 | 1553 | * behind, there is at least some 200ms blocks of time when the map will be |
6c54734e | 1554 | * left alone, so the datapath can operate unhindered. |
e6ef6cc6 DDP |
1555 | */ |
1556 | #define CT_CLEAN_INTERVAL 5000 /* 5 seconds */ | |
1557 | #define CT_CLEAN_MIN_INTERVAL 200 /* 0.2 seconds */ | |
1558 | ||
1559 | static void * | |
1560 | clean_thread_main(void *f_) | |
1561 | { | |
1562 | struct conntrack *ct = f_; | |
1563 | ||
1564 | while (!latch_is_set(&ct->clean_thread_exit)) { | |
1565 | long long next_wake; | |
1566 | long long now = time_msec(); | |
e6ef6cc6 DDP |
1567 | next_wake = conntrack_clean(ct, now); |
1568 | ||
1569 | if (next_wake < now) { | |
1570 | poll_timer_wait_until(now + CT_CLEAN_MIN_INTERVAL); | |
1571 | } else { | |
1572 | poll_timer_wait_until(MAX(next_wake, now + CT_CLEAN_INTERVAL)); | |
1573 | } | |
1574 | latch_wait(&ct->clean_thread_exit); | |
1575 | poll_block(); | |
1576 | } | |
1577 | ||
1578 | return NULL; | |
1579 | } | |
1580 | \f | |
e917d3ee DB |
1581 | /* 'Data' is a pointer to the beginning of the L3 header and 'new_data' is |
1582 | * used to store a pointer to the first byte after the L3 header. 'Size' is | |
1583 | * the size of the packet beyond the data pointer. */ | |
a489b168 DDP |
1584 | static inline bool |
1585 | extract_l3_ipv4(struct conn_key *key, const void *data, size_t size, | |
1586 | const char **new_data, bool validate_checksum) | |
1587 | { | |
e917d3ee DB |
1588 | if (OVS_UNLIKELY(size < IP_HEADER_LEN)) { |
1589 | return false; | |
a489b168 DDP |
1590 | } |
1591 | ||
dec0dbbc DB |
1592 | const struct ip_header *ip = data; |
1593 | size_t ip_len = IP_IHL(ip->ip_ihl_ver) * 4; | |
a489b168 | 1594 | |
e917d3ee DB |
1595 | if (OVS_UNLIKELY(ip_len < IP_HEADER_LEN)) { |
1596 | return false; | |
1597 | } | |
a489b168 | 1598 | |
e917d3ee DB |
1599 | if (OVS_UNLIKELY(size < ip_len)) { |
1600 | return false; | |
1601 | } | |
a489b168 | 1602 | |
e917d3ee DB |
1603 | if (IP_IS_FRAGMENT(ip->ip_frag_off)) { |
1604 | return false; | |
a489b168 DDP |
1605 | } |
1606 | ||
1607 | if (validate_checksum && csum(data, ip_len) != 0) { | |
1608 | return false; | |
1609 | } | |
1610 | ||
e917d3ee DB |
1611 | if (new_data) { |
1612 | *new_data = (char *) data + ip_len; | |
1613 | } | |
1614 | ||
cda1b109 DB |
1615 | key->src.addr.ipv4 = get_16aligned_be32(&ip->ip_src); |
1616 | key->dst.addr.ipv4 = get_16aligned_be32(&ip->ip_dst); | |
a489b168 DDP |
1617 | key->nw_proto = ip->ip_proto; |
1618 | ||
1619 | return true; | |
1620 | } | |
1621 | ||
e917d3ee DB |
1622 | /* 'Data' is a pointer to the beginning of the L3 header and 'new_data' is |
1623 | * used to store a pointer to the first byte after the L3 header. 'Size' is | |
1624 | * the size of the packet beyond the data pointer. */ | |
a489b168 DDP |
1625 | static inline bool |
1626 | extract_l3_ipv6(struct conn_key *key, const void *data, size_t size, | |
1627 | const char **new_data) | |
1628 | { | |
1629 | const struct ovs_16aligned_ip6_hdr *ip6 = data; | |
286de272 | 1630 | |
e917d3ee DB |
1631 | if (OVS_UNLIKELY(size < sizeof *ip6)) { |
1632 | return false; | |
a489b168 DDP |
1633 | } |
1634 | ||
1635 | data = ip6 + 1; | |
1636 | size -= sizeof *ip6; | |
dec0dbbc DB |
1637 | uint8_t nw_proto = ip6->ip6_nxt; |
1638 | uint8_t nw_frag = 0; | |
a489b168 | 1639 | |
523464ab DB |
1640 | const struct ovs_16aligned_ip6_frag *frag_hdr; |
1641 | if (!parse_ipv6_ext_hdrs(&data, &size, &nw_proto, &nw_frag, &frag_hdr)) { | |
a489b168 DDP |
1642 | return false; |
1643 | } | |
1644 | ||
a489b168 DDP |
1645 | if (nw_frag) { |
1646 | return false; | |
1647 | } | |
1648 | ||
c8b1ad49 DB |
1649 | if (new_data) { |
1650 | *new_data = data; | |
1651 | } | |
1652 | ||
cda1b109 DB |
1653 | memcpy(&key->src.addr.ipv6, &ip6->ip6_src, sizeof key->src.addr); |
1654 | memcpy(&key->dst.addr.ipv6, &ip6->ip6_dst, sizeof key->dst.addr); | |
a489b168 DDP |
1655 | key->nw_proto = nw_proto; |
1656 | ||
1657 | return true; | |
1658 | } | |
1659 | ||
1660 | static inline bool | |
1661 | checksum_valid(const struct conn_key *key, const void *data, size_t size, | |
1662 | const void *l3) | |
1663 | { | |
a489b168 | 1664 | if (key->dl_type == htons(ETH_TYPE_IP)) { |
76d85771 DB |
1665 | uint32_t csum = packet_csum_pseudoheader(l3); |
1666 | return csum_finish(csum_continue(csum, data, size)) == 0; | |
a489b168 | 1667 | } else if (key->dl_type == htons(ETH_TYPE_IPV6)) { |
76d85771 | 1668 | return packet_csum_upperlayer6(l3, data, key->nw_proto, size) == 0; |
a489b168 | 1669 | } else { |
38c69ccf | 1670 | COVERAGE_INC(conntrack_l4csum_err); |
a489b168 DDP |
1671 | return false; |
1672 | } | |
a489b168 DDP |
1673 | } |
1674 | ||
1675 | static inline bool | |
1676 | check_l4_tcp(const struct conn_key *key, const void *data, size_t size, | |
324459a3 | 1677 | const void *l3, bool validate_checksum) |
a489b168 DDP |
1678 | { |
1679 | const struct tcp_header *tcp = data; | |
40225b0c BP |
1680 | if (size < sizeof *tcp) { |
1681 | return false; | |
1682 | } | |
a489b168 | 1683 | |
40225b0c | 1684 | size_t tcp_len = TCP_OFFSET(tcp->tcp_ctl) * 4; |
a489b168 DDP |
1685 | if (OVS_UNLIKELY(tcp_len < TCP_HEADER_LEN || tcp_len > size)) { |
1686 | return false; | |
1687 | } | |
1688 | ||
324459a3 | 1689 | return validate_checksum ? checksum_valid(key, data, size, l3) : true; |
a489b168 DDP |
1690 | } |
1691 | ||
1692 | static inline bool | |
1693 | check_l4_udp(const struct conn_key *key, const void *data, size_t size, | |
324459a3 | 1694 | const void *l3, bool validate_checksum) |
a489b168 DDP |
1695 | { |
1696 | const struct udp_header *udp = data; | |
40225b0c BP |
1697 | if (size < sizeof *udp) { |
1698 | return false; | |
1699 | } | |
a489b168 | 1700 | |
40225b0c | 1701 | size_t udp_len = ntohs(udp->udp_len); |
a489b168 DDP |
1702 | if (OVS_UNLIKELY(udp_len < UDP_HEADER_LEN || udp_len > size)) { |
1703 | return false; | |
1704 | } | |
1705 | ||
1706 | /* Validation must be skipped if checksum is 0 on IPv4 packets */ | |
1707 | return (udp->udp_csum == 0 && key->dl_type == htons(ETH_TYPE_IP)) | |
324459a3 | 1708 | || (validate_checksum ? checksum_valid(key, data, size, l3) : true); |
a489b168 DDP |
1709 | } |
1710 | ||
1711 | static inline bool | |
324459a3 | 1712 | check_l4_icmp(const void *data, size_t size, bool validate_checksum) |
a489b168 | 1713 | { |
38c69ccf WT |
1714 | if (validate_checksum && csum(data, size) != 0) { |
1715 | COVERAGE_INC(conntrack_l4csum_err); | |
1716 | return false; | |
1717 | } else { | |
1718 | return true; | |
1719 | } | |
a489b168 DDP |
1720 | } |
1721 | ||
1722 | static inline bool | |
1723 | check_l4_icmp6(const struct conn_key *key, const void *data, size_t size, | |
324459a3 | 1724 | const void *l3, bool validate_checksum) |
a489b168 | 1725 | { |
324459a3 | 1726 | return validate_checksum ? checksum_valid(key, data, size, l3) : true; |
a489b168 DDP |
1727 | } |
1728 | ||
1729 | static inline bool | |
6c2a9306 DB |
1730 | extract_l4_tcp(struct conn_key *key, const void *data, size_t size, |
1731 | size_t *chk_len) | |
a489b168 | 1732 | { |
6c2a9306 | 1733 | if (OVS_UNLIKELY(size < (chk_len ? *chk_len : TCP_HEADER_LEN))) { |
a489b168 DDP |
1734 | return false; |
1735 | } | |
1736 | ||
dec0dbbc | 1737 | const struct tcp_header *tcp = data; |
a489b168 DDP |
1738 | key->src.port = tcp->tcp_src; |
1739 | key->dst.port = tcp->tcp_dst; | |
1740 | ||
1741 | /* Port 0 is invalid */ | |
1742 | return key->src.port && key->dst.port; | |
1743 | } | |
1744 | ||
1745 | static inline bool | |
6c2a9306 DB |
1746 | extract_l4_udp(struct conn_key *key, const void *data, size_t size, |
1747 | size_t *chk_len) | |
a489b168 | 1748 | { |
6c2a9306 | 1749 | if (OVS_UNLIKELY(size < (chk_len ? *chk_len : UDP_HEADER_LEN))) { |
a489b168 DDP |
1750 | return false; |
1751 | } | |
1752 | ||
dec0dbbc | 1753 | const struct udp_header *udp = data; |
a489b168 DDP |
1754 | key->src.port = udp->udp_src; |
1755 | key->dst.port = udp->udp_dst; | |
1756 | ||
1757 | /* Port 0 is invalid */ | |
1758 | return key->src.port && key->dst.port; | |
1759 | } | |
1760 | ||
1761 | static inline bool extract_l4(struct conn_key *key, const void *data, | |
324459a3 | 1762 | size_t size, bool *related, const void *l3, |
6c2a9306 | 1763 | bool validate_checksum, size_t *chk_len); |
a489b168 | 1764 | |
b269a122 DDP |
1765 | static uint8_t |
1766 | reverse_icmp_type(uint8_t type) | |
1767 | { | |
1768 | switch (type) { | |
1769 | case ICMP4_ECHO_REQUEST: | |
1770 | return ICMP4_ECHO_REPLY; | |
1771 | case ICMP4_ECHO_REPLY: | |
1772 | return ICMP4_ECHO_REQUEST; | |
1773 | ||
1774 | case ICMP4_TIMESTAMP: | |
1775 | return ICMP4_TIMESTAMPREPLY; | |
1776 | case ICMP4_TIMESTAMPREPLY: | |
1777 | return ICMP4_TIMESTAMP; | |
1778 | ||
1779 | case ICMP4_INFOREQUEST: | |
1780 | return ICMP4_INFOREPLY; | |
1781 | case ICMP4_INFOREPLY: | |
1782 | return ICMP4_INFOREQUEST; | |
1783 | default: | |
1784 | OVS_NOT_REACHED(); | |
1785 | } | |
1786 | } | |
1787 | ||
a489b168 DDP |
1788 | /* If 'related' is not NULL and the function is processing an ICMP |
1789 | * error packet, extract the l3 and l4 fields from the nested header | |
1790 | * instead and set *related to true. If 'related' is NULL we're | |
1791 | * already processing a nested header and no such recursion is | |
1792 | * possible */ | |
1793 | static inline int | |
1794 | extract_l4_icmp(struct conn_key *key, const void *data, size_t size, | |
6c2a9306 | 1795 | bool *related, size_t *chk_len) |
a489b168 | 1796 | { |
6c2a9306 | 1797 | if (OVS_UNLIKELY(size < (chk_len ? *chk_len : ICMP_HEADER_LEN))) { |
a489b168 DDP |
1798 | return false; |
1799 | } | |
1800 | ||
dec0dbbc DB |
1801 | const struct icmp_header *icmp = data; |
1802 | ||
a489b168 DDP |
1803 | switch (icmp->icmp_type) { |
1804 | case ICMP4_ECHO_REQUEST: | |
1805 | case ICMP4_ECHO_REPLY: | |
1806 | case ICMP4_TIMESTAMP: | |
1807 | case ICMP4_TIMESTAMPREPLY: | |
1808 | case ICMP4_INFOREQUEST: | |
1809 | case ICMP4_INFOREPLY: | |
b269a122 DDP |
1810 | if (icmp->icmp_code != 0) { |
1811 | return false; | |
1812 | } | |
a489b168 | 1813 | /* Separate ICMP connection: identified using id */ |
b269a122 DDP |
1814 | key->src.icmp_id = key->dst.icmp_id = icmp->icmp_fields.echo.id; |
1815 | key->src.icmp_type = icmp->icmp_type; | |
1816 | key->dst.icmp_type = reverse_icmp_type(icmp->icmp_type); | |
a489b168 DDP |
1817 | break; |
1818 | case ICMP4_DST_UNREACH: | |
1819 | case ICMP4_TIME_EXCEEDED: | |
1820 | case ICMP4_PARAM_PROB: | |
1821 | case ICMP4_SOURCEQUENCH: | |
1822 | case ICMP4_REDIRECT: { | |
1823 | /* ICMP packet part of another connection. We should | |
1824 | * extract the key from embedded packet header */ | |
1825 | struct conn_key inner_key; | |
1826 | const char *l3 = (const char *) (icmp + 1); | |
1827 | const char *tail = (const char *) data + size; | |
1828 | const char *l4; | |
a489b168 DDP |
1829 | |
1830 | if (!related) { | |
1831 | return false; | |
1832 | } | |
1833 | ||
1834 | memset(&inner_key, 0, sizeof inner_key); | |
1835 | inner_key.dl_type = htons(ETH_TYPE_IP); | |
dec0dbbc | 1836 | bool ok = extract_l3_ipv4(&inner_key, l3, tail - l3, &l4, false); |
a489b168 DDP |
1837 | if (!ok) { |
1838 | return false; | |
1839 | } | |
1840 | ||
cda1b109 | 1841 | if (inner_key.src.addr.ipv4 != key->dst.addr.ipv4) { |
a489b168 DDP |
1842 | return false; |
1843 | } | |
1844 | ||
1845 | key->src = inner_key.src; | |
1846 | key->dst = inner_key.dst; | |
1847 | key->nw_proto = inner_key.nw_proto; | |
6c2a9306 | 1848 | size_t check_len = ICMP_ERROR_DATA_L4_LEN; |
a489b168 | 1849 | |
6c2a9306 | 1850 | ok = extract_l4(key, l4, tail - l4, NULL, l3, false, &check_len); |
a489b168 DDP |
1851 | if (ok) { |
1852 | conn_key_reverse(key); | |
1853 | *related = true; | |
1854 | } | |
1855 | return ok; | |
1856 | } | |
1857 | default: | |
1858 | return false; | |
1859 | } | |
1860 | ||
1861 | return true; | |
1862 | } | |
1863 | ||
b269a122 DDP |
1864 | static uint8_t |
1865 | reverse_icmp6_type(uint8_t type) | |
1866 | { | |
1867 | switch (type) { | |
1868 | case ICMP6_ECHO_REQUEST: | |
1869 | return ICMP6_ECHO_REPLY; | |
1870 | case ICMP6_ECHO_REPLY: | |
1871 | return ICMP6_ECHO_REQUEST; | |
1872 | default: | |
1873 | OVS_NOT_REACHED(); | |
1874 | } | |
1875 | } | |
1876 | ||
a489b168 DDP |
1877 | /* If 'related' is not NULL and the function is processing an ICMP |
1878 | * error packet, extract the l3 and l4 fields from the nested header | |
1879 | * instead and set *related to true. If 'related' is NULL we're | |
1880 | * already processing a nested header and no such recursion is | |
1881 | * possible */ | |
1882 | static inline bool | |
1883 | extract_l4_icmp6(struct conn_key *key, const void *data, size_t size, | |
1884 | bool *related) | |
1885 | { | |
1886 | const struct icmp6_header *icmp6 = data; | |
1887 | ||
1888 | /* All the messages that we support need at least 4 bytes after | |
1889 | * the header */ | |
1890 | if (size < sizeof *icmp6 + 4) { | |
1891 | return false; | |
1892 | } | |
1893 | ||
1894 | switch (icmp6->icmp6_type) { | |
1895 | case ICMP6_ECHO_REQUEST: | |
1896 | case ICMP6_ECHO_REPLY: | |
b269a122 DDP |
1897 | if (icmp6->icmp6_code != 0) { |
1898 | return false; | |
1899 | } | |
a489b168 | 1900 | /* Separate ICMP connection: identified using id */ |
b269a122 DDP |
1901 | key->src.icmp_id = key->dst.icmp_id = *(ovs_be16 *) (icmp6 + 1); |
1902 | key->src.icmp_type = icmp6->icmp6_type; | |
1903 | key->dst.icmp_type = reverse_icmp6_type(icmp6->icmp6_type); | |
a489b168 DDP |
1904 | break; |
1905 | case ICMP6_DST_UNREACH: | |
1906 | case ICMP6_PACKET_TOO_BIG: | |
1907 | case ICMP6_TIME_EXCEEDED: | |
1908 | case ICMP6_PARAM_PROB: { | |
1909 | /* ICMP packet part of another connection. We should | |
1910 | * extract the key from embedded packet header */ | |
1911 | struct conn_key inner_key; | |
1912 | const char *l3 = (const char *) icmp6 + 8; | |
1913 | const char *tail = (const char *) data + size; | |
1914 | const char *l4 = NULL; | |
a489b168 DDP |
1915 | |
1916 | if (!related) { | |
1917 | return false; | |
1918 | } | |
1919 | ||
1920 | memset(&inner_key, 0, sizeof inner_key); | |
1921 | inner_key.dl_type = htons(ETH_TYPE_IPV6); | |
dec0dbbc | 1922 | bool ok = extract_l3_ipv6(&inner_key, l3, tail - l3, &l4); |
a489b168 DDP |
1923 | if (!ok) { |
1924 | return false; | |
1925 | } | |
1926 | ||
1927 | /* pf doesn't do this, but it seems a good idea */ | |
cda1b109 DB |
1928 | if (!ipv6_addr_equals(&inner_key.src.addr.ipv6, |
1929 | &key->dst.addr.ipv6)) { | |
a489b168 DDP |
1930 | return false; |
1931 | } | |
1932 | ||
1933 | key->src = inner_key.src; | |
1934 | key->dst = inner_key.dst; | |
1935 | key->nw_proto = inner_key.nw_proto; | |
1936 | ||
6c2a9306 | 1937 | ok = extract_l4(key, l4, tail - l4, NULL, l3, false, NULL); |
a489b168 DDP |
1938 | if (ok) { |
1939 | conn_key_reverse(key); | |
1940 | *related = true; | |
1941 | } | |
1942 | return ok; | |
1943 | } | |
1944 | default: | |
1945 | return false; | |
1946 | } | |
1947 | ||
1948 | return true; | |
1949 | } | |
1950 | ||
1951 | /* Extract l4 fields into 'key', which must already contain valid l3 | |
1952 | * members. | |
1953 | * | |
1954 | * If 'related' is not NULL and an ICMP error packet is being | |
1955 | * processed, the function will extract the key from the packet nested | |
1401f6de | 1956 | * in the ICMP payload and set '*related' to true. |
a489b168 | 1957 | * |
9171c635 DB |
1958 | * 'size' here is the layer 4 size, which can be a nested size if parsing |
1959 | * an ICMP or ICMP6 header. | |
1960 | * | |
a489b168 | 1961 | * If 'related' is NULL, it means that we're already parsing a header nested |
6c2a9306 DB |
1962 | * in an ICMP error. In this case, we skip the checksum and some length |
1963 | * validations. */ | |
a489b168 DDP |
1964 | static inline bool |
1965 | extract_l4(struct conn_key *key, const void *data, size_t size, bool *related, | |
6c2a9306 | 1966 | const void *l3, bool validate_checksum, size_t *chk_len) |
a489b168 DDP |
1967 | { |
1968 | if (key->nw_proto == IPPROTO_TCP) { | |
324459a3 | 1969 | return (!related || check_l4_tcp(key, data, size, l3, |
6c2a9306 DB |
1970 | validate_checksum)) |
1971 | && extract_l4_tcp(key, data, size, chk_len); | |
a489b168 | 1972 | } else if (key->nw_proto == IPPROTO_UDP) { |
324459a3 | 1973 | return (!related || check_l4_udp(key, data, size, l3, |
6c2a9306 DB |
1974 | validate_checksum)) |
1975 | && extract_l4_udp(key, data, size, chk_len); | |
a489b168 DDP |
1976 | } else if (key->dl_type == htons(ETH_TYPE_IP) |
1977 | && key->nw_proto == IPPROTO_ICMP) { | |
324459a3 | 1978 | return (!related || check_l4_icmp(data, size, validate_checksum)) |
6c2a9306 | 1979 | && extract_l4_icmp(key, data, size, related, chk_len); |
a489b168 DDP |
1980 | } else if (key->dl_type == htons(ETH_TYPE_IPV6) |
1981 | && key->nw_proto == IPPROTO_ICMPV6) { | |
324459a3 | 1982 | return (!related || check_l4_icmp6(key, data, size, l3, |
6c2a9306 DB |
1983 | validate_checksum)) |
1984 | && extract_l4_icmp6(key, data, size, related); | |
a489b168 DDP |
1985 | } else { |
1986 | return false; | |
1987 | } | |
1988 | } | |
1989 | ||
1990 | static bool | |
66e4ad8a | 1991 | conn_key_extract(struct conntrack *ct, struct dp_packet *pkt, ovs_be16 dl_type, |
a489b168 DDP |
1992 | struct conn_lookup_ctx *ctx, uint16_t zone) |
1993 | { | |
2482b0b0 | 1994 | const struct eth_header *l2 = dp_packet_eth(pkt); |
a489b168 DDP |
1995 | const struct ip_header *l3 = dp_packet_l3(pkt); |
1996 | const char *l4 = dp_packet_l4(pkt); | |
a489b168 DDP |
1997 | |
1998 | memset(ctx, 0, sizeof *ctx); | |
1999 | ||
2000 | if (!l2 || !l3 || !l4) { | |
2001 | return false; | |
2002 | } | |
2003 | ||
2004 | ctx->key.zone = zone; | |
2005 | ||
2006 | /* XXX In this function we parse the packet (again, it has already | |
2007 | * gone through miniflow_extract()) for two reasons: | |
2008 | * | |
2009 | * 1) To extract the l3 addresses and l4 ports. | |
2010 | * We already have the l3 and l4 headers' pointers. Extracting | |
2011 | * the l3 addresses and the l4 ports is really cheap, since they | |
2012 | * can be found at fixed locations. | |
66e4ad8a DDP |
2013 | * 2) To extract the l4 type. |
2014 | * Extracting the l4 types, for IPv6 can be quite expensive, because | |
2015 | * it's not at a fixed location. | |
a489b168 DDP |
2016 | * |
2017 | * Here's a way to avoid (2) with the help of the datapath. | |
66e4ad8a | 2018 | * The datapath doesn't keep the packet's extracted flow[1], so |
a489b168 | 2019 | * using that is not an option. We could use the packet's matching |
66e4ad8a DDP |
2020 | * megaflow, but we have to make sure that the l4 type (nw_proto) |
2021 | * is unwildcarded. This means either: | |
a489b168 | 2022 | * |
66e4ad8a DDP |
2023 | * a) dpif-netdev unwildcards the l4 type when a new flow is installed |
2024 | * if the actions contains ct(). | |
a489b168 | 2025 | * |
66e4ad8a DDP |
2026 | * b) ofproto-dpif-xlate unwildcards the l4 type when translating a ct() |
2027 | * action. This is already done in different actions, but it's | |
2028 | * unnecessary for the kernel. | |
a489b168 DDP |
2029 | * |
2030 | * --- | |
66e4ad8a | 2031 | * [1] The reasons for this are that keeping the flow increases |
a489b168 DDP |
2032 | * (slightly) the cache footprint and increases computation |
2033 | * time as we move the packet around. Most importantly, the flow | |
2034 | * should be updated by the actions and this can be slow, as | |
2035 | * we use a sparse representation (miniflow). | |
2036 | * | |
2037 | */ | |
dec0dbbc | 2038 | bool ok; |
66e4ad8a | 2039 | ctx->key.dl_type = dl_type; |
dec0dbbc | 2040 | |
a489b168 | 2041 | if (ctx->key.dl_type == htons(ETH_TYPE_IP)) { |
dec0dbbc | 2042 | bool hwol_bad_l3_csum = dp_packet_ip_checksum_bad(pkt); |
324459a3 SC |
2043 | if (hwol_bad_l3_csum) { |
2044 | ok = false; | |
2045 | } else { | |
29cf9c1b FL |
2046 | bool hwol_good_l3_csum = dp_packet_ip_checksum_valid(pkt) |
2047 | || dp_packet_hwol_is_ipv4(pkt); | |
324459a3 | 2048 | /* Validate the checksum only when hwol is not supported. */ |
9171c635 | 2049 | ok = extract_l3_ipv4(&ctx->key, l3, dp_packet_l3_size(pkt), NULL, |
324459a3 SC |
2050 | !hwol_good_l3_csum); |
2051 | } | |
a489b168 | 2052 | } else if (ctx->key.dl_type == htons(ETH_TYPE_IPV6)) { |
9171c635 | 2053 | ok = extract_l3_ipv6(&ctx->key, l3, dp_packet_l3_size(pkt), NULL); |
a489b168 DDP |
2054 | } else { |
2055 | ok = false; | |
2056 | } | |
2057 | ||
2058 | if (ok) { | |
324459a3 SC |
2059 | bool hwol_bad_l4_csum = dp_packet_l4_checksum_bad(pkt); |
2060 | if (!hwol_bad_l4_csum) { | |
29cf9c1b FL |
2061 | bool hwol_good_l4_csum = dp_packet_l4_checksum_valid(pkt) |
2062 | || dp_packet_hwol_tx_l4_checksum(pkt); | |
324459a3 | 2063 | /* Validate the checksum only when hwol is not supported. */ |
9171c635 | 2064 | if (extract_l4(&ctx->key, l4, dp_packet_l4_size(pkt), |
6c2a9306 DB |
2065 | &ctx->icmp_related, l3, !hwol_good_l4_csum, |
2066 | NULL)) { | |
324459a3 SC |
2067 | ctx->hash = conn_key_hash(&ctx->key, ct->hash_basis); |
2068 | return true; | |
2069 | } | |
a489b168 DDP |
2070 | } |
2071 | } | |
2072 | ||
2073 | return false; | |
2074 | } | |
92edd073 DB |
2075 | |
2076 | static uint32_t | |
cda1b109 | 2077 | ct_addr_hash_add(uint32_t hash, const union ct_addr *addr) |
92edd073 DB |
2078 | { |
2079 | BUILD_ASSERT_DECL(sizeof *addr % 4 == 0); | |
2080 | return hash_add_bytes32(hash, (const uint32_t *) addr, sizeof *addr); | |
2081 | } | |
2082 | ||
2083 | static uint32_t | |
2084 | ct_endpoint_hash_add(uint32_t hash, const struct ct_endpoint *ep) | |
2085 | { | |
2086 | BUILD_ASSERT_DECL(sizeof *ep % 4 == 0); | |
2087 | return hash_add_bytes32(hash, (const uint32_t *) ep, sizeof *ep); | |
2088 | } | |
a489b168 DDP |
2089 | \f |
2090 | /* Symmetric */ | |
2091 | static uint32_t | |
2092 | conn_key_hash(const struct conn_key *key, uint32_t basis) | |
2093 | { | |
2094 | uint32_t hsrc, hdst, hash; | |
a489b168 | 2095 | hsrc = hdst = basis; |
6b1d4625 DB |
2096 | hsrc = ct_endpoint_hash_add(hsrc, &key->src); |
2097 | hdst = ct_endpoint_hash_add(hdst, &key->dst); | |
a489b168 DDP |
2098 | |
2099 | /* Even if source and destination are swapped the hash will be the same. */ | |
2100 | hash = hsrc ^ hdst; | |
2101 | ||
2102 | /* Hash the rest of the key(L3 and L4 types and zone). */ | |
763b40b0 | 2103 | return hash_words((uint32_t *) (&key->dst + 1), |
a489b168 DDP |
2104 | (uint32_t *) (key + 1) - (uint32_t *) (&key->dst + 1), |
2105 | hash); | |
a489b168 DDP |
2106 | } |
2107 | ||
2108 | static void | |
2109 | conn_key_reverse(struct conn_key *key) | |
2110 | { | |
dec0dbbc | 2111 | struct ct_endpoint tmp = key->src; |
a489b168 DDP |
2112 | key->src = key->dst; |
2113 | key->dst = tmp; | |
2114 | } | |
2115 | ||
286de272 | 2116 | static uint32_t |
cda1b109 | 2117 | nat_ipv6_addrs_delta(struct in6_addr *ipv6_min, struct in6_addr *ipv6_max) |
286de272 | 2118 | { |
cda1b109 DB |
2119 | uint8_t *ipv6_min_hi = &ipv6_min->s6_addr[0]; |
2120 | uint8_t *ipv6_min_lo = &ipv6_min->s6_addr[0] + sizeof(uint64_t); | |
2121 | uint8_t *ipv6_max_hi = &ipv6_max->s6_addr[0]; | |
2122 | uint8_t *ipv6_max_lo = &ipv6_max->s6_addr[0] + sizeof(uint64_t); | |
286de272 DB |
2123 | |
2124 | ovs_be64 addr6_64_min_hi; | |
2125 | ovs_be64 addr6_64_min_lo; | |
2126 | memcpy(&addr6_64_min_hi, ipv6_min_hi, sizeof addr6_64_min_hi); | |
2127 | memcpy(&addr6_64_min_lo, ipv6_min_lo, sizeof addr6_64_min_lo); | |
2128 | ||
2129 | ovs_be64 addr6_64_max_hi; | |
2130 | ovs_be64 addr6_64_max_lo; | |
2131 | memcpy(&addr6_64_max_hi, ipv6_max_hi, sizeof addr6_64_max_hi); | |
2132 | memcpy(&addr6_64_max_lo, ipv6_max_lo, sizeof addr6_64_max_lo); | |
2133 | ||
2134 | uint64_t diff; | |
dec0dbbc | 2135 | |
286de272 DB |
2136 | if (addr6_64_min_hi == addr6_64_max_hi && |
2137 | ntohll(addr6_64_min_lo) <= ntohll(addr6_64_max_lo)) { | |
2138 | diff = ntohll(addr6_64_max_lo) - ntohll(addr6_64_min_lo); | |
2139 | } else if (ntohll(addr6_64_min_hi) + 1 == ntohll(addr6_64_max_hi) && | |
2140 | ntohll(addr6_64_min_lo) > ntohll(addr6_64_max_lo)) { | |
2141 | diff = UINT64_MAX - (ntohll(addr6_64_min_lo) - | |
2142 | ntohll(addr6_64_max_lo) - 1); | |
2143 | } else { | |
2144 | /* Limit address delta supported to 32 bits or 4 billion approximately. | |
2145 | * Possibly, this should be visible to the user through a datapath | |
2146 | * support check, however the practical impact is probably nil. */ | |
2147 | diff = 0xfffffffe; | |
2148 | } | |
dec0dbbc | 2149 | |
286de272 DB |
2150 | if (diff > 0xfffffffe) { |
2151 | diff = 0xfffffffe; | |
2152 | } | |
2153 | return diff; | |
2154 | } | |
2155 | ||
2156 | /* This function must be used in tandem with nat_ipv6_addrs_delta(), which | |
2157 | * restricts the input parameters. */ | |
a489b168 | 2158 | static void |
cda1b109 | 2159 | nat_ipv6_addr_increment(struct in6_addr *ipv6, uint32_t increment) |
286de272 | 2160 | { |
cda1b109 DB |
2161 | uint8_t *ipv6_hi = &ipv6->s6_addr[0]; |
2162 | uint8_t *ipv6_lo = &ipv6->s6_addr[0] + sizeof(ovs_be64); | |
286de272 DB |
2163 | ovs_be64 addr6_64_hi; |
2164 | ovs_be64 addr6_64_lo; | |
2165 | memcpy(&addr6_64_hi, ipv6_hi, sizeof addr6_64_hi); | |
2166 | memcpy(&addr6_64_lo, ipv6_lo, sizeof addr6_64_lo); | |
2167 | ||
2168 | if (UINT64_MAX - increment >= ntohll(addr6_64_lo)) { | |
2169 | addr6_64_lo = htonll(increment + ntohll(addr6_64_lo)); | |
2170 | } else if (addr6_64_hi != OVS_BE64_MAX) { | |
2171 | addr6_64_hi = htonll(1 + ntohll(addr6_64_hi)); | |
2172 | addr6_64_lo = htonll(increment - (UINT64_MAX - | |
2173 | ntohll(addr6_64_lo) + 1)); | |
2174 | } else { | |
2175 | OVS_NOT_REACHED(); | |
2176 | } | |
2177 | ||
2178 | memcpy(ipv6_hi, &addr6_64_hi, sizeof addr6_64_hi); | |
2179 | memcpy(ipv6_lo, &addr6_64_lo, sizeof addr6_64_lo); | |
286de272 DB |
2180 | } |
2181 | ||
2182 | static uint32_t | |
2183 | nat_range_hash(const struct conn *conn, uint32_t basis) | |
2184 | { | |
2185 | uint32_t hash = basis; | |
286de272 | 2186 | |
92edd073 DB |
2187 | hash = ct_addr_hash_add(hash, &conn->nat_info->min_addr); |
2188 | hash = ct_addr_hash_add(hash, &conn->nat_info->max_addr); | |
2189 | hash = hash_add(hash, | |
2190 | (conn->nat_info->max_port << 16) | |
2191 | | conn->nat_info->min_port); | |
92edd073 DB |
2192 | hash = ct_endpoint_hash_add(hash, &conn->key.src); |
2193 | hash = ct_endpoint_hash_add(hash, &conn->key.dst); | |
286de272 DB |
2194 | hash = hash_add(hash, (OVS_FORCE uint32_t) conn->key.dl_type); |
2195 | hash = hash_add(hash, conn->key.nw_proto); | |
2196 | hash = hash_add(hash, conn->key.zone); | |
92edd073 DB |
2197 | |
2198 | /* The purpose of the second parameter is to distinguish hashes of data of | |
2199 | * different length; our data always has the same length so there is no | |
2200 | * value in counting. */ | |
2201 | return hash_finish(hash, 0); | |
286de272 DB |
2202 | } |
2203 | ||
2204 | static bool | |
2205 | nat_select_range_tuple(struct conntrack *ct, const struct conn *conn, | |
2206 | struct conn *nat_conn) | |
2207 | { | |
bd5e81a0 DB |
2208 | enum { MIN_NAT_EPHEMERAL_PORT = 1024, |
2209 | MAX_NAT_EPHEMERAL_PORT = 65535 }; | |
286de272 DB |
2210 | |
2211 | uint16_t min_port; | |
2212 | uint16_t max_port; | |
2213 | uint16_t first_port; | |
286de272 DB |
2214 | uint32_t hash = nat_range_hash(conn, ct->hash_basis); |
2215 | ||
2216 | if ((conn->nat_info->nat_action & NAT_ACTION_SRC) && | |
2217 | (!(conn->nat_info->nat_action & NAT_ACTION_SRC_PORT))) { | |
2218 | min_port = ntohs(conn->key.src.port); | |
2219 | max_port = ntohs(conn->key.src.port); | |
2220 | first_port = min_port; | |
2221 | } else if ((conn->nat_info->nat_action & NAT_ACTION_DST) && | |
2222 | (!(conn->nat_info->nat_action & NAT_ACTION_DST_PORT))) { | |
2223 | min_port = ntohs(conn->key.dst.port); | |
2224 | max_port = ntohs(conn->key.dst.port); | |
2225 | first_port = min_port; | |
2226 | } else { | |
2227 | uint16_t deltap = conn->nat_info->max_port - conn->nat_info->min_port; | |
2228 | uint32_t port_index = hash % (deltap + 1); | |
2229 | first_port = conn->nat_info->min_port + port_index; | |
2230 | min_port = conn->nat_info->min_port; | |
2231 | max_port = conn->nat_info->max_port; | |
2232 | } | |
2233 | ||
2234 | uint32_t deltaa = 0; | |
2235 | uint32_t address_index; | |
cda1b109 | 2236 | union ct_addr ct_addr; |
286de272 | 2237 | memset(&ct_addr, 0, sizeof ct_addr); |
cda1b109 | 2238 | union ct_addr max_ct_addr; |
286de272 DB |
2239 | memset(&max_ct_addr, 0, sizeof max_ct_addr); |
2240 | max_ct_addr = conn->nat_info->max_addr; | |
2241 | ||
2242 | if (conn->key.dl_type == htons(ETH_TYPE_IP)) { | |
cda1b109 DB |
2243 | deltaa = ntohl(conn->nat_info->max_addr.ipv4) - |
2244 | ntohl(conn->nat_info->min_addr.ipv4); | |
286de272 | 2245 | address_index = hash % (deltaa + 1); |
cda1b109 DB |
2246 | ct_addr.ipv4 = htonl( |
2247 | ntohl(conn->nat_info->min_addr.ipv4) + address_index); | |
286de272 | 2248 | } else { |
cda1b109 DB |
2249 | deltaa = nat_ipv6_addrs_delta(&conn->nat_info->min_addr.ipv6, |
2250 | &conn->nat_info->max_addr.ipv6); | |
286de272 DB |
2251 | /* deltaa must be within 32 bits for full hash coverage. A 64 or |
2252 | * 128 bit hash is unnecessary and hence not used here. Most code | |
2253 | * is kept common with V4; nat_ipv6_addrs_delta() will do the | |
2254 | * enforcement via max_ct_addr. */ | |
2255 | max_ct_addr = conn->nat_info->min_addr; | |
cda1b109 | 2256 | nat_ipv6_addr_increment(&max_ct_addr.ipv6, deltaa); |
286de272 | 2257 | address_index = hash % (deltaa + 1); |
cda1b109 DB |
2258 | ct_addr.ipv6 = conn->nat_info->min_addr.ipv6; |
2259 | nat_ipv6_addr_increment(&ct_addr.ipv6, address_index); | |
286de272 DB |
2260 | } |
2261 | ||
2262 | uint16_t port = first_port; | |
2263 | bool all_ports_tried = false; | |
32b2c81f DB |
2264 | /* For DNAT or for specified port ranges, we don't use ephemeral ports. */ |
2265 | bool ephemeral_ports_tried | |
2266 | = conn->nat_info->nat_action & NAT_ACTION_DST || | |
2267 | conn->nat_info->nat_action & NAT_ACTION_SRC_PORT | |
2268 | ? true : false; | |
cda1b109 | 2269 | union ct_addr first_addr = ct_addr; |
4cd0481c DB |
2270 | bool pat_enabled = conn->key.nw_proto != IPPROTO_ICMP && |
2271 | conn->key.nw_proto != IPPROTO_ICMPV6; | |
286de272 DB |
2272 | |
2273 | while (true) { | |
2274 | if (conn->nat_info->nat_action & NAT_ACTION_SRC) { | |
2275 | nat_conn->rev_key.dst.addr = ct_addr; | |
e32cd4c6 | 2276 | if (pat_enabled) { |
2277 | nat_conn->rev_key.dst.port = htons(port); | |
2278 | } | |
286de272 | 2279 | } else { |
1c8689d7 | 2280 | nat_conn->rev_key.src.addr = ct_addr; |
e32cd4c6 | 2281 | if (pat_enabled) { |
2282 | nat_conn->rev_key.src.port = htons(port); | |
2283 | } | |
286de272 DB |
2284 | } |
2285 | ||
e32cd4c6 | 2286 | bool found = conn_lookup(ct, &nat_conn->rev_key, time_msec(), NULL, |
2287 | NULL); | |
967bb5c5 | 2288 | if (!found) { |
286de272 | 2289 | return true; |
4cd0481c | 2290 | } else if (pat_enabled && !all_ports_tried) { |
286de272 DB |
2291 | if (min_port == max_port) { |
2292 | all_ports_tried = true; | |
2293 | } else if (port == max_port) { | |
2294 | port = min_port; | |
2295 | } else { | |
2296 | port++; | |
2297 | } | |
2298 | if (port == first_port) { | |
2299 | all_ports_tried = true; | |
2300 | } | |
2301 | } else { | |
2302 | if (memcmp(&ct_addr, &max_ct_addr, sizeof ct_addr)) { | |
2303 | if (conn->key.dl_type == htons(ETH_TYPE_IP)) { | |
cda1b109 | 2304 | ct_addr.ipv4 = htonl(ntohl(ct_addr.ipv4) + 1); |
286de272 | 2305 | } else { |
cda1b109 | 2306 | nat_ipv6_addr_increment(&ct_addr.ipv6, 1); |
286de272 DB |
2307 | } |
2308 | } else { | |
2309 | ct_addr = conn->nat_info->min_addr; | |
2310 | } | |
2311 | if (!memcmp(&ct_addr, &first_addr, sizeof ct_addr)) { | |
4cd0481c | 2312 | if (pat_enabled && !ephemeral_ports_tried) { |
ac04639a | 2313 | ephemeral_ports_tried = true; |
286de272 | 2314 | ct_addr = conn->nat_info->min_addr; |
8417e688 | 2315 | first_addr = ct_addr; |
286de272 DB |
2316 | min_port = MIN_NAT_EPHEMERAL_PORT; |
2317 | max_port = MAX_NAT_EPHEMERAL_PORT; | |
2318 | } else { | |
2319 | break; | |
2320 | } | |
2321 | } | |
2322 | first_port = min_port; | |
2323 | port = first_port; | |
2324 | all_ports_tried = false; | |
2325 | } | |
2326 | } | |
2327 | return false; | |
2328 | } | |
2329 | ||
a489b168 | 2330 | static enum ct_update_res |
967bb5c5 DB |
2331 | conn_update(struct conntrack *ct, struct conn *conn, struct dp_packet *pkt, |
2332 | struct conn_lookup_ctx *ctx, long long now) | |
a489b168 | 2333 | { |
967bb5c5 DB |
2334 | ovs_mutex_lock(&conn->lock); |
2335 | enum ct_update_res update_res = | |
2336 | l4_protos[conn->key.nw_proto]->conn_update(ct, conn, pkt, ctx->reply, | |
2337 | now); | |
2338 | ovs_mutex_unlock(&conn->lock); | |
2339 | return update_res; | |
a489b168 DDP |
2340 | } |
2341 | ||
2342 | static bool | |
2343 | conn_expired(struct conn *conn, long long now) | |
2344 | { | |
286de272 | 2345 | if (conn->conn_type == CT_CONN_TYPE_DEFAULT) { |
967bb5c5 DB |
2346 | ovs_mutex_lock(&conn->lock); |
2347 | bool expired = now >= conn->expiration ? true : false; | |
2348 | ovs_mutex_unlock(&conn->lock); | |
2349 | return expired; | |
286de272 DB |
2350 | } |
2351 | return false; | |
a489b168 DDP |
2352 | } |
2353 | ||
2354 | static bool | |
2355 | valid_new(struct dp_packet *pkt, struct conn_key *key) | |
2356 | { | |
2357 | return l4_protos[key->nw_proto]->valid_new(pkt); | |
2358 | } | |
2359 | ||
2360 | static struct conn * | |
967bb5c5 | 2361 | new_conn(struct conntrack *ct, struct dp_packet *pkt, struct conn_key *key, |
2078901a | 2362 | long long now, uint32_t tp_id) |
a489b168 | 2363 | { |
2078901a | 2364 | return l4_protos[key->nw_proto]->new_conn(ct, pkt, now, tp_id); |
a489b168 DDP |
2365 | } |
2366 | ||
2367 | static void | |
967bb5c5 | 2368 | delete_conn_cmn(struct conn *conn) |
a489b168 | 2369 | { |
286de272 | 2370 | free(conn->nat_info); |
bd5e81a0 | 2371 | free(conn->alg); |
a489b168 DDP |
2372 | free(conn); |
2373 | } | |
967bb5c5 DB |
2374 | |
2375 | static void | |
2376 | delete_conn(struct conn *conn) | |
2377 | { | |
2378 | ovs_assert(conn->conn_type == CT_CONN_TYPE_DEFAULT); | |
2379 | ovs_mutex_destroy(&conn->lock); | |
2380 | free(conn->nat_conn); | |
2381 | delete_conn_cmn(conn); | |
2382 | } | |
2383 | ||
2384 | /* Only used by conn_clean_one(). */ | |
2385 | static void | |
2386 | delete_conn_one(struct conn *conn) | |
2387 | { | |
2388 | if (conn->conn_type == CT_CONN_TYPE_DEFAULT) { | |
2389 | ovs_mutex_destroy(&conn->lock); | |
2390 | } | |
2391 | delete_conn_cmn(conn); | |
2392 | } | |
4d4e68ed | 2393 | \f |
271e48a0 YHW |
2394 | /* Convert a conntrack address 'a' into an IP address 'b' based on 'dl_type'. |
2395 | * | |
2396 | * Note that 'dl_type' should be either "ETH_TYPE_IP" or "ETH_TYPE_IPv6" | |
2397 | * in network-byte order. */ | |
4d4e68ed | 2398 | static void |
cda1b109 | 2399 | ct_endpoint_to_ct_dpif_inet_addr(const union ct_addr *a, |
4d4e68ed DDP |
2400 | union ct_dpif_inet_addr *b, |
2401 | ovs_be16 dl_type) | |
2402 | { | |
2403 | if (dl_type == htons(ETH_TYPE_IP)) { | |
cda1b109 | 2404 | b->ip = a->ipv4; |
4d4e68ed | 2405 | } else if (dl_type == htons(ETH_TYPE_IPV6)){ |
cda1b109 | 2406 | b->in6 = a->ipv6; |
4d4e68ed DDP |
2407 | } |
2408 | } | |
2409 | ||
271e48a0 YHW |
2410 | /* Convert an IP address 'a' into a conntrack address 'b' based on 'dl_type'. |
2411 | * | |
2412 | * Note that 'dl_type' should be either "ETH_TYPE_IP" or "ETH_TYPE_IPv6" | |
2413 | * in network-byte order. */ | |
2414 | static void | |
2415 | ct_dpif_inet_addr_to_ct_endpoint(const union ct_dpif_inet_addr *a, | |
cda1b109 | 2416 | union ct_addr *b, ovs_be16 dl_type) |
271e48a0 YHW |
2417 | { |
2418 | if (dl_type == htons(ETH_TYPE_IP)) { | |
cda1b109 | 2419 | b->ipv4 = a->ip; |
271e48a0 | 2420 | } else if (dl_type == htons(ETH_TYPE_IPV6)){ |
cda1b109 | 2421 | b->ipv6 = a->in6; |
271e48a0 YHW |
2422 | } |
2423 | } | |
2424 | ||
4d4e68ed DDP |
2425 | static void |
2426 | conn_key_to_tuple(const struct conn_key *key, struct ct_dpif_tuple *tuple) | |
2427 | { | |
2428 | if (key->dl_type == htons(ETH_TYPE_IP)) { | |
2429 | tuple->l3_type = AF_INET; | |
2430 | } else if (key->dl_type == htons(ETH_TYPE_IPV6)) { | |
2431 | tuple->l3_type = AF_INET6; | |
2432 | } | |
2433 | tuple->ip_proto = key->nw_proto; | |
2434 | ct_endpoint_to_ct_dpif_inet_addr(&key->src.addr, &tuple->src, | |
2435 | key->dl_type); | |
2436 | ct_endpoint_to_ct_dpif_inet_addr(&key->dst.addr, &tuple->dst, | |
2437 | key->dl_type); | |
2438 | ||
2439 | if (key->nw_proto == IPPROTO_ICMP || key->nw_proto == IPPROTO_ICMPV6) { | |
b269a122 DDP |
2440 | tuple->icmp_id = key->src.icmp_id; |
2441 | tuple->icmp_type = key->src.icmp_type; | |
2442 | tuple->icmp_code = key->src.icmp_code; | |
4d4e68ed DDP |
2443 | } else { |
2444 | tuple->src_port = key->src.port; | |
2445 | tuple->dst_port = key->dst.port; | |
2446 | } | |
2447 | } | |
2448 | ||
271e48a0 YHW |
2449 | static void |
2450 | tuple_to_conn_key(const struct ct_dpif_tuple *tuple, uint16_t zone, | |
2451 | struct conn_key *key) | |
2452 | { | |
2453 | if (tuple->l3_type == AF_INET) { | |
2454 | key->dl_type = htons(ETH_TYPE_IP); | |
2455 | } else if (tuple->l3_type == AF_INET6) { | |
2456 | key->dl_type = htons(ETH_TYPE_IPV6); | |
2457 | } | |
2458 | key->nw_proto = tuple->ip_proto; | |
2459 | ct_dpif_inet_addr_to_ct_endpoint(&tuple->src, &key->src.addr, | |
2460 | key->dl_type); | |
2461 | ct_dpif_inet_addr_to_ct_endpoint(&tuple->dst, &key->dst.addr, | |
2462 | key->dl_type); | |
2463 | ||
2464 | if (tuple->ip_proto == IPPROTO_ICMP || tuple->ip_proto == IPPROTO_ICMPV6) { | |
2465 | key->src.icmp_id = tuple->icmp_id; | |
2466 | key->src.icmp_type = tuple->icmp_type; | |
2467 | key->src.icmp_code = tuple->icmp_code; | |
2468 | key->dst.icmp_id = tuple->icmp_id; | |
2469 | key->dst.icmp_type = reverse_icmp_type(tuple->icmp_type); | |
2470 | key->dst.icmp_code = tuple->icmp_code; | |
2471 | } else { | |
2472 | key->src.port = tuple->src_port; | |
2473 | key->dst.port = tuple->dst_port; | |
2474 | } | |
2475 | key->zone = zone; | |
2476 | } | |
2477 | ||
4d4e68ed DDP |
2478 | static void |
2479 | conn_to_ct_dpif_entry(const struct conn *conn, struct ct_dpif_entry *entry, | |
f1a0469e | 2480 | long long now) |
4d4e68ed | 2481 | { |
4d4e68ed DDP |
2482 | memset(entry, 0, sizeof *entry); |
2483 | conn_key_to_tuple(&conn->key, &entry->tuple_orig); | |
2484 | conn_key_to_tuple(&conn->rev_key, &entry->tuple_reply); | |
2485 | ||
2486 | entry->zone = conn->key.zone; | |
4d4e68ed | 2487 | |
967bb5c5 DB |
2488 | ovs_mutex_lock(&conn->lock); |
2489 | entry->mark = conn->mark; | |
286de272 | 2490 | memcpy(&entry->labels, &conn->label, sizeof entry->labels); |
4d4e68ed | 2491 | |
dec0dbbc | 2492 | long long expiration = conn->expiration - now; |
4d4e68ed | 2493 | |
dec0dbbc | 2494 | struct ct_l4_proto *class = l4_protos[conn->key.nw_proto]; |
4d4e68ed DDP |
2495 | if (class->conn_get_protoinfo) { |
2496 | class->conn_get_protoinfo(conn, &entry->protoinfo); | |
2497 | } | |
f1a0469e | 2498 | ovs_mutex_unlock(&conn->lock); |
bd5e81a0 | 2499 | |
f1a0469e | 2500 | entry->timeout = (expiration > 0) ? expiration / 1000 : 0; |
bd5e81a0 DB |
2501 | |
2502 | if (conn->alg) { | |
2503 | /* Caller is responsible for freeing. */ | |
2504 | entry->helper.name = xstrdup(conn->alg); | |
2505 | } | |
4d4e68ed DDP |
2506 | } |
2507 | ||
4ea96698 DB |
2508 | struct ipf * |
2509 | conntrack_ipf_ctx(struct conntrack *ct) | |
2510 | { | |
2511 | return ct->ipf; | |
2512 | } | |
2513 | ||
4d4e68ed DDP |
2514 | int |
2515 | conntrack_dump_start(struct conntrack *ct, struct conntrack_dump *dump, | |
ded30c74 | 2516 | const uint16_t *pzone, int *ptot_bkts) |
4d4e68ed DDP |
2517 | { |
2518 | memset(dump, 0, sizeof(*dump)); | |
dec0dbbc | 2519 | |
4d4e68ed DDP |
2520 | if (pzone) { |
2521 | dump->zone = *pzone; | |
2522 | dump->filter_zone = true; | |
2523 | } | |
4d4e68ed | 2524 | |
dec0dbbc | 2525 | dump->ct = ct; |
967bb5c5 | 2526 | *ptot_bkts = 1; /* Need to clean up the callers. */ |
4d4e68ed DDP |
2527 | return 0; |
2528 | } | |
2529 | ||
2530 | int | |
2531 | conntrack_dump_next(struct conntrack_dump *dump, struct ct_dpif_entry *entry) | |
2532 | { | |
2533 | struct conntrack *ct = dump->ct; | |
2534 | long long now = time_msec(); | |
2535 | ||
967bb5c5 DB |
2536 | for (;;) { |
2537 | struct cmap_node *cm_node = cmap_next_position(&ct->conns, | |
2538 | &dump->cm_pos); | |
2539 | if (!cm_node) { | |
2540 | break; | |
4d4e68ed | 2541 | } |
967bb5c5 DB |
2542 | struct conn *conn; |
2543 | INIT_CONTAINER(conn, cm_node, cm_node); | |
2544 | if ((!dump->filter_zone || conn->key.zone == dump->zone) && | |
2545 | (conn->conn_type != CT_CONN_TYPE_UN_NAT)) { | |
f1a0469e | 2546 | conn_to_ct_dpif_entry(conn, entry, now); |
4d4e68ed DDP |
2547 | return 0; |
2548 | } | |
2549 | } | |
967bb5c5 | 2550 | |
4d4e68ed DDP |
2551 | return EOF; |
2552 | } | |
2553 | ||
2554 | int | |
2555 | conntrack_dump_done(struct conntrack_dump *dump OVS_UNUSED) | |
2556 | { | |
2557 | return 0; | |
2558 | } | |
5d9cbb4c DDP |
2559 | |
2560 | int | |
2561 | conntrack_flush(struct conntrack *ct, const uint16_t *zone) | |
2562 | { | |
967bb5c5 DB |
2563 | struct conn *conn; |
2564 | ||
2565 | ovs_mutex_lock(&ct->ct_lock); | |
2566 | CMAP_FOR_EACH (conn, cm_node, &ct->conns) { | |
2567 | if (!zone || *zone == conn->key.zone) { | |
2568 | conn_clean_one(ct, conn); | |
5d9cbb4c | 2569 | } |
5d9cbb4c | 2570 | } |
967bb5c5 | 2571 | ovs_mutex_unlock(&ct->ct_lock); |
bd5e81a0 | 2572 | |
5d9cbb4c DDP |
2573 | return 0; |
2574 | } | |
bd5e81a0 | 2575 | |
271e48a0 YHW |
2576 | int |
2577 | conntrack_flush_tuple(struct conntrack *ct, const struct ct_dpif_tuple *tuple, | |
2578 | uint16_t zone) | |
2579 | { | |
271e48a0 | 2580 | int error = 0; |
4048c508 DB |
2581 | struct conn_key key; |
2582 | struct conn *conn; | |
271e48a0 | 2583 | |
4048c508 DB |
2584 | memset(&key, 0, sizeof(key)); |
2585 | tuple_to_conn_key(tuple, zone, &key); | |
967bb5c5 | 2586 | ovs_mutex_lock(&ct->ct_lock); |
4048c508 | 2587 | conn_lookup(ct, &key, time_msec(), &conn, NULL); |
271e48a0 | 2588 | |
4048c508 DB |
2589 | if (conn && conn->conn_type == CT_CONN_TYPE_DEFAULT) { |
2590 | conn_clean(ct, conn); | |
271e48a0 | 2591 | } else { |
a1d5eeff | 2592 | VLOG_WARN("Must flush tuple using the original pre-NATed tuple"); |
271e48a0 YHW |
2593 | error = ENOENT; |
2594 | } | |
967bb5c5 DB |
2595 | |
2596 | ovs_mutex_unlock(&ct->ct_lock); | |
271e48a0 YHW |
2597 | return error; |
2598 | } | |
2599 | ||
c92339ad DB |
2600 | int |
2601 | conntrack_set_maxconns(struct conntrack *ct, uint32_t maxconns) | |
2602 | { | |
2603 | atomic_store_relaxed(&ct->n_conn_limit, maxconns); | |
2604 | return 0; | |
2605 | } | |
2606 | ||
2607 | int | |
2608 | conntrack_get_maxconns(struct conntrack *ct, uint32_t *maxconns) | |
2609 | { | |
2610 | atomic_read_relaxed(&ct->n_conn_limit, maxconns); | |
2611 | return 0; | |
2612 | } | |
2613 | ||
875075b3 DB |
2614 | int |
2615 | conntrack_get_nconns(struct conntrack *ct, uint32_t *nconns) | |
2616 | { | |
2617 | *nconns = atomic_count_get(&ct->n_conn); | |
2618 | return 0; | |
2619 | } | |
2620 | ||
64207120 DB |
2621 | int |
2622 | conntrack_set_tcp_seq_chk(struct conntrack *ct, bool enabled) | |
2623 | { | |
2624 | atomic_store_relaxed(&ct->tcp_seq_chk, enabled); | |
2625 | return 0; | |
2626 | } | |
2627 | ||
2628 | bool | |
2629 | conntrack_get_tcp_seq_chk(struct conntrack *ct) | |
2630 | { | |
2631 | bool enabled; | |
2632 | atomic_read_relaxed(&ct->tcp_seq_chk, &enabled); | |
2633 | return enabled; | |
2634 | } | |
2635 | ||
bd5e81a0 DB |
2636 | /* This function must be called with the ct->resources read lock taken. */ |
2637 | static struct alg_exp_node * | |
be38342d DB |
2638 | expectation_lookup(struct hmap *alg_expectations, const struct conn_key *key, |
2639 | uint32_t basis, bool src_ip_wc) | |
bd5e81a0 | 2640 | { |
c3f6bae2 DB |
2641 | struct conn_key check_key; |
2642 | memcpy(&check_key, key, sizeof check_key); | |
bd5e81a0 | 2643 | check_key.src.port = ALG_WC_SRC_PORT; |
dec0dbbc | 2644 | |
be38342d DB |
2645 | if (src_ip_wc) { |
2646 | memset(&check_key.src.addr, 0, sizeof check_key.src.addr); | |
2647 | } | |
dec0dbbc | 2648 | |
bd5e81a0 DB |
2649 | struct alg_exp_node *alg_exp_node; |
2650 | ||
bd5e81a0 | 2651 | HMAP_FOR_EACH_WITH_HASH (alg_exp_node, node, |
dec0dbbc | 2652 | conn_key_hash(&check_key, basis), |
bd5e81a0 DB |
2653 | alg_expectations) { |
2654 | if (!conn_key_cmp(&alg_exp_node->key, &check_key)) { | |
2655 | return alg_exp_node; | |
2656 | } | |
2657 | } | |
2658 | return NULL; | |
2659 | } | |
2660 | ||
4417ca3d DB |
2661 | /* This function must be called with the ct->resources write lock taken. */ |
2662 | static void | |
2663 | expectation_remove(struct hmap *alg_expectations, | |
2664 | const struct conn_key *key, uint32_t basis) | |
2665 | { | |
2666 | struct alg_exp_node *alg_exp_node; | |
2667 | ||
2668 | HMAP_FOR_EACH_WITH_HASH (alg_exp_node, node, conn_key_hash(key, basis), | |
2669 | alg_expectations) { | |
2670 | if (!conn_key_cmp(&alg_exp_node->key, key)) { | |
2671 | hmap_remove(alg_expectations, &alg_exp_node->node); | |
2672 | break; | |
2673 | } | |
2674 | } | |
2675 | } | |
2676 | ||
2677 | /* This function must be called with the ct->resources read lock taken. */ | |
2678 | static struct alg_exp_node * | |
2679 | expectation_ref_lookup_unique(const struct hindex *alg_expectation_refs, | |
f51cf36d | 2680 | const struct conn_key *parent_key, |
4417ca3d DB |
2681 | const struct conn_key *alg_exp_key, |
2682 | uint32_t basis) | |
2683 | { | |
2684 | struct alg_exp_node *alg_exp_node; | |
2685 | ||
2686 | HINDEX_FOR_EACH_WITH_HASH (alg_exp_node, node_ref, | |
f51cf36d | 2687 | conn_key_hash(parent_key, basis), |
4417ca3d | 2688 | alg_expectation_refs) { |
f51cf36d | 2689 | if (!conn_key_cmp(&alg_exp_node->parent_key, parent_key) && |
4417ca3d DB |
2690 | !conn_key_cmp(&alg_exp_node->key, alg_exp_key)) { |
2691 | return alg_exp_node; | |
2692 | } | |
2693 | } | |
2694 | return NULL; | |
2695 | } | |
2696 | ||
2697 | /* This function must be called with the ct->resources write lock taken. */ | |
2698 | static void | |
2699 | expectation_ref_create(struct hindex *alg_expectation_refs, | |
2700 | struct alg_exp_node *alg_exp_node, | |
2701 | uint32_t basis) | |
2702 | { | |
2703 | if (!expectation_ref_lookup_unique(alg_expectation_refs, | |
f51cf36d | 2704 | &alg_exp_node->parent_key, |
4417ca3d DB |
2705 | &alg_exp_node->key, basis)) { |
2706 | hindex_insert(alg_expectation_refs, &alg_exp_node->node_ref, | |
f51cf36d | 2707 | conn_key_hash(&alg_exp_node->parent_key, basis)); |
4417ca3d DB |
2708 | } |
2709 | } | |
2710 | ||
2711 | static void | |
f51cf36d | 2712 | expectation_clean(struct conntrack *ct, const struct conn_key *parent_key) |
4417ca3d | 2713 | { |
967bb5c5 | 2714 | ovs_rwlock_wrlock(&ct->resources_lock); |
4417ca3d DB |
2715 | |
2716 | struct alg_exp_node *node, *next; | |
2717 | HINDEX_FOR_EACH_WITH_HASH_SAFE (node, next, node_ref, | |
f51cf36d | 2718 | conn_key_hash(parent_key, ct->hash_basis), |
4417ca3d | 2719 | &ct->alg_expectation_refs) { |
f51cf36d | 2720 | if (!conn_key_cmp(&node->parent_key, parent_key)) { |
967bb5c5 DB |
2721 | expectation_remove(&ct->alg_expectations, &node->key, |
2722 | ct->hash_basis); | |
4417ca3d DB |
2723 | hindex_remove(&ct->alg_expectation_refs, &node->node_ref); |
2724 | free(node); | |
2725 | } | |
2726 | } | |
2727 | ||
967bb5c5 | 2728 | ovs_rwlock_unlock(&ct->resources_lock); |
4417ca3d DB |
2729 | } |
2730 | ||
bd5e81a0 | 2731 | static void |
be38342d | 2732 | expectation_create(struct conntrack *ct, ovs_be16 dst_port, |
f51cf36d | 2733 | const struct conn *parent_conn, bool reply, bool src_ip_wc, |
be38342d | 2734 | bool skip_nat) |
bd5e81a0 | 2735 | { |
cda1b109 DB |
2736 | union ct_addr src_addr; |
2737 | union ct_addr dst_addr; | |
2738 | union ct_addr alg_nat_repl_addr; | |
be38342d | 2739 | struct alg_exp_node *alg_exp_node = xzalloc(sizeof *alg_exp_node); |
bd5e81a0 | 2740 | |
be38342d | 2741 | if (reply) { |
f51cf36d BP |
2742 | src_addr = parent_conn->key.src.addr; |
2743 | dst_addr = parent_conn->key.dst.addr; | |
efa29a89 | 2744 | alg_exp_node->nat_rpl_dst = true; |
be38342d DB |
2745 | if (skip_nat) { |
2746 | alg_nat_repl_addr = dst_addr; | |
f51cf36d BP |
2747 | } else if (parent_conn->nat_info && |
2748 | parent_conn->nat_info->nat_action & NAT_ACTION_DST) { | |
2749 | alg_nat_repl_addr = parent_conn->rev_key.src.addr; | |
efa29a89 | 2750 | alg_exp_node->nat_rpl_dst = false; |
be38342d | 2751 | } else { |
f51cf36d | 2752 | alg_nat_repl_addr = parent_conn->rev_key.dst.addr; |
be38342d | 2753 | } |
be38342d | 2754 | } else { |
f51cf36d BP |
2755 | src_addr = parent_conn->rev_key.src.addr; |
2756 | dst_addr = parent_conn->rev_key.dst.addr; | |
efa29a89 | 2757 | alg_exp_node->nat_rpl_dst = false; |
be38342d DB |
2758 | if (skip_nat) { |
2759 | alg_nat_repl_addr = src_addr; | |
f51cf36d BP |
2760 | } else if (parent_conn->nat_info && |
2761 | parent_conn->nat_info->nat_action & NAT_ACTION_DST) { | |
2762 | alg_nat_repl_addr = parent_conn->key.dst.addr; | |
efa29a89 | 2763 | alg_exp_node->nat_rpl_dst = true; |
be38342d | 2764 | } else { |
f51cf36d | 2765 | alg_nat_repl_addr = parent_conn->key.src.addr; |
be38342d | 2766 | } |
be38342d DB |
2767 | } |
2768 | if (src_ip_wc) { | |
2769 | memset(&src_addr, 0, sizeof src_addr); | |
bd5e81a0 DB |
2770 | } |
2771 | ||
f51cf36d BP |
2772 | alg_exp_node->key.dl_type = parent_conn->key.dl_type; |
2773 | alg_exp_node->key.nw_proto = parent_conn->key.nw_proto; | |
2774 | alg_exp_node->key.zone = parent_conn->key.zone; | |
bd5e81a0 DB |
2775 | alg_exp_node->key.src.addr = src_addr; |
2776 | alg_exp_node->key.dst.addr = dst_addr; | |
2777 | alg_exp_node->key.src.port = ALG_WC_SRC_PORT; | |
2778 | alg_exp_node->key.dst.port = dst_port; | |
f51cf36d BP |
2779 | alg_exp_node->parent_mark = parent_conn->mark; |
2780 | alg_exp_node->parent_label = parent_conn->label; | |
2781 | memcpy(&alg_exp_node->parent_key, &parent_conn->key, | |
2782 | sizeof alg_exp_node->parent_key); | |
bd5e81a0 DB |
2783 | /* Take the write lock here because it is almost 100% |
2784 | * likely that the lookup will fail and | |
2785 | * expectation_create() will be called below. */ | |
967bb5c5 | 2786 | ovs_rwlock_wrlock(&ct->resources_lock); |
bd5e81a0 | 2787 | struct alg_exp_node *alg_exp = expectation_lookup( |
be38342d | 2788 | &ct->alg_expectations, &alg_exp_node->key, ct->hash_basis, src_ip_wc); |
bd5e81a0 DB |
2789 | if (alg_exp) { |
2790 | free(alg_exp_node); | |
967bb5c5 | 2791 | ovs_rwlock_unlock(&ct->resources_lock); |
bd5e81a0 DB |
2792 | return; |
2793 | } | |
2794 | ||
2795 | alg_exp_node->alg_nat_repl_addr = alg_nat_repl_addr; | |
4417ca3d | 2796 | hmap_insert(&ct->alg_expectations, &alg_exp_node->node, |
dec0dbbc | 2797 | conn_key_hash(&alg_exp_node->key, ct->hash_basis)); |
4417ca3d DB |
2798 | expectation_ref_create(&ct->alg_expectation_refs, alg_exp_node, |
2799 | ct->hash_basis); | |
967bb5c5 | 2800 | ovs_rwlock_unlock(&ct->resources_lock); |
bd5e81a0 DB |
2801 | } |
2802 | ||
bd5e81a0 DB |
2803 | static void |
2804 | replace_substring(char *substr, uint8_t substr_size, | |
2805 | uint8_t total_size, char *rep_str, | |
2806 | uint8_t rep_str_size) | |
2807 | { | |
2808 | memmove(substr + rep_str_size, substr + substr_size, | |
2809 | total_size - substr_size); | |
2810 | memcpy(substr, rep_str, rep_str_size); | |
2811 | } | |
2812 | ||
cd7c99a6 DB |
2813 | static void |
2814 | repl_bytes(char *str, char c1, char c2) | |
2815 | { | |
2816 | while (*str) { | |
2817 | if (*str == c1) { | |
2818 | *str = c2; | |
2819 | } | |
2820 | str++; | |
2821 | } | |
2822 | } | |
2823 | ||
2824 | static void | |
2825 | modify_packet(struct dp_packet *pkt, char *pkt_str, size_t size, | |
2826 | char *repl_str, size_t repl_size, | |
2827 | uint32_t orig_used_size) | |
2828 | { | |
2829 | replace_substring(pkt_str, size, | |
2830 | (const char *) dp_packet_tail(pkt) - pkt_str, | |
2831 | repl_str, repl_size); | |
2832 | dp_packet_set_size(pkt, orig_used_size + (int) repl_size - (int) size); | |
2833 | } | |
2834 | ||
bd5e81a0 DB |
2835 | /* Replace IPV4 address in FTP message with NATed address. */ |
2836 | static int | |
2837 | repl_ftp_v4_addr(struct dp_packet *pkt, ovs_be32 v4_addr_rep, | |
2838 | char *ftp_data_start, | |
cd7c99a6 DB |
2839 | size_t addr_offset_from_ftp_data_start, |
2840 | size_t addr_size OVS_UNUSED) | |
bd5e81a0 DB |
2841 | { |
2842 | enum { MAX_FTP_V4_NAT_DELTA = 8 }; | |
2843 | ||
2844 | /* Do conservative check for pathological MTU usage. */ | |
2845 | uint32_t orig_used_size = dp_packet_size(pkt); | |
cd7c99a6 DB |
2846 | if (orig_used_size + MAX_FTP_V4_NAT_DELTA > |
2847 | dp_packet_get_allocated(pkt)) { | |
2848 | ||
bd5e81a0 | 2849 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5); |
cd7c99a6 DB |
2850 | VLOG_WARN_RL(&rl, "Unsupported effective MTU %u used with FTP V4", |
2851 | dp_packet_get_allocated(pkt)); | |
bd5e81a0 DB |
2852 | return 0; |
2853 | } | |
2854 | ||
cd7c99a6 DB |
2855 | char v4_addr_str[INET_ADDRSTRLEN] = {0}; |
2856 | ovs_assert(inet_ntop(AF_INET, &v4_addr_rep, v4_addr_str, | |
2857 | sizeof v4_addr_str)); | |
2858 | repl_bytes(v4_addr_str, '.', ','); | |
2859 | modify_packet(pkt, ftp_data_start + addr_offset_from_ftp_data_start, | |
2860 | addr_size, v4_addr_str, strlen(v4_addr_str), | |
2861 | orig_used_size); | |
2862 | return (int) strlen(v4_addr_str) - (int) addr_size; | |
bd5e81a0 DB |
2863 | } |
2864 | ||
2865 | static char * | |
2866 | skip_non_digits(char *str) | |
2867 | { | |
2868 | while (!isdigit(*str) && *str != 0) { | |
2869 | str++; | |
2870 | } | |
2871 | return str; | |
2872 | } | |
2873 | ||
2874 | static char * | |
2875 | terminate_number_str(char *str, uint8_t max_digits) | |
2876 | { | |
2877 | uint8_t digits_found = 0; | |
2878 | while (isdigit(*str) && digits_found <= max_digits) { | |
2879 | str++; | |
2880 | digits_found++; | |
2881 | } | |
2882 | ||
2883 | *str = 0; | |
2884 | return str; | |
2885 | } | |
2886 | ||
2887 | ||
2888 | static void | |
2889 | get_ftp_ctl_msg(struct dp_packet *pkt, char *ftp_msg) | |
2890 | { | |
2891 | struct tcp_header *th = dp_packet_l4(pkt); | |
2892 | char *tcp_hdr = (char *) th; | |
2893 | uint32_t tcp_payload_len = tcp_payload_length(pkt); | |
2894 | size_t tcp_payload_of_interest = MIN(tcp_payload_len, | |
2895 | LARGEST_FTP_MSG_OF_INTEREST); | |
2896 | size_t tcp_hdr_len = TCP_OFFSET(th->tcp_ctl) * 4; | |
2897 | ||
2898 | ovs_strlcpy(ftp_msg, tcp_hdr + tcp_hdr_len, | |
2899 | tcp_payload_of_interest); | |
2900 | } | |
2901 | ||
2902 | static enum ftp_ctl_pkt | |
2903 | detect_ftp_ctl_type(const struct conn_lookup_ctx *ctx, | |
2904 | struct dp_packet *pkt) | |
2905 | { | |
bd5e81a0 DB |
2906 | char ftp_msg[LARGEST_FTP_MSG_OF_INTEREST + 1] = {0}; |
2907 | get_ftp_ctl_msg(pkt, ftp_msg); | |
dec0dbbc | 2908 | |
bd5e81a0 DB |
2909 | if (ctx->key.dl_type == htons(ETH_TYPE_IPV6)) { |
2910 | if (strncasecmp(ftp_msg, FTP_EPRT_CMD, strlen(FTP_EPRT_CMD)) && | |
2911 | !strcasestr(ftp_msg, FTP_EPSV_REPLY)) { | |
2912 | return CT_FTP_CTL_OTHER; | |
2913 | } | |
2914 | } else { | |
2915 | if (strncasecmp(ftp_msg, FTP_PORT_CMD, strlen(FTP_PORT_CMD)) && | |
2916 | strncasecmp(ftp_msg, FTP_PASV_REPLY_CODE, | |
2917 | strlen(FTP_PASV_REPLY_CODE))) { | |
2918 | return CT_FTP_CTL_OTHER; | |
2919 | } | |
2920 | } | |
2921 | ||
2922 | return CT_FTP_CTL_INTEREST; | |
2923 | } | |
2924 | ||
2925 | static enum ftp_ctl_pkt | |
2926 | process_ftp_ctl_v4(struct conntrack *ct, | |
2927 | struct dp_packet *pkt, | |
2928 | const struct conn *conn_for_expectation, | |
4417ca3d | 2929 | ovs_be32 *v4_addr_rep, |
bd5e81a0 | 2930 | char **ftp_data_v4_start, |
cd7c99a6 DB |
2931 | size_t *addr_offset_from_ftp_data_start, |
2932 | size_t *addr_size) | |
bd5e81a0 DB |
2933 | { |
2934 | struct tcp_header *th = dp_packet_l4(pkt); | |
2935 | size_t tcp_hdr_len = TCP_OFFSET(th->tcp_ctl) * 4; | |
2936 | char *tcp_hdr = (char *) th; | |
2937 | *ftp_data_v4_start = tcp_hdr + tcp_hdr_len; | |
2938 | char ftp_msg[LARGEST_FTP_MSG_OF_INTEREST + 1] = {0}; | |
2939 | get_ftp_ctl_msg(pkt, ftp_msg); | |
bd5e81a0 DB |
2940 | char *ftp = ftp_msg; |
2941 | enum ct_alg_mode mode; | |
dec0dbbc | 2942 | |
23bea975 | 2943 | if (!strncasecmp(ftp, FTP_PORT_CMD, strlen(FTP_PORT_CMD))) { |
bd5e81a0 DB |
2944 | ftp = ftp_msg + strlen(FTP_PORT_CMD); |
2945 | mode = CT_FTP_MODE_ACTIVE; | |
2946 | } else { | |
2947 | ftp = ftp_msg + strlen(FTP_PASV_REPLY_CODE); | |
2948 | mode = CT_FTP_MODE_PASSIVE; | |
2949 | } | |
2950 | ||
2951 | /* Find first space. */ | |
2952 | ftp = strchr(ftp, ' '); | |
2953 | if (!ftp) { | |
2954 | return CT_FTP_CTL_INVALID; | |
2955 | } | |
2956 | ||
2957 | /* Find the first digit, after space. */ | |
2958 | ftp = skip_non_digits(ftp); | |
2959 | if (*ftp == 0) { | |
2960 | return CT_FTP_CTL_INVALID; | |
2961 | } | |
2962 | ||
2963 | char *ip_addr_start = ftp; | |
2964 | *addr_offset_from_ftp_data_start = ip_addr_start - ftp_msg; | |
bd5e81a0 | 2965 | |
dec0dbbc | 2966 | uint8_t comma_count = 0; |
bd5e81a0 DB |
2967 | while (comma_count < 4 && *ftp) { |
2968 | if (*ftp == ',') { | |
2969 | comma_count++; | |
2970 | if (comma_count == 4) { | |
2971 | *ftp = 0; | |
2972 | } else { | |
2973 | *ftp = '.'; | |
2974 | } | |
2975 | } | |
2976 | ftp++; | |
2977 | } | |
2978 | if (comma_count != 4) { | |
2979 | return CT_FTP_CTL_INVALID; | |
2980 | } | |
2981 | ||
2982 | struct in_addr ip_addr; | |
2983 | int rc2 = inet_pton(AF_INET, ip_addr_start, &ip_addr); | |
2984 | if (rc2 != 1) { | |
2985 | return CT_FTP_CTL_INVALID; | |
2986 | } | |
2987 | ||
cd7c99a6 | 2988 | *addr_size = ftp - ip_addr_start - 1; |
bd5e81a0 DB |
2989 | char *save_ftp = ftp; |
2990 | ftp = terminate_number_str(ftp, MAX_FTP_PORT_DGTS); | |
2991 | if (!ftp) { | |
2992 | return CT_FTP_CTL_INVALID; | |
2993 | } | |
2994 | int value; | |
2995 | if (!str_to_int(save_ftp, 10, &value)) { | |
2996 | return CT_FTP_CTL_INVALID; | |
2997 | } | |
2998 | ||
2999 | /* This is derived from the L4 port maximum is 65535. */ | |
3000 | if (value > 255) { | |
3001 | return CT_FTP_CTL_INVALID; | |
3002 | } | |
3003 | ||
3004 | uint16_t port_hs = value; | |
3005 | port_hs <<= 8; | |
3006 | ||
3007 | /* Skip over comma. */ | |
3008 | ftp++; | |
3009 | save_ftp = ftp; | |
3010 | bool digit_found = false; | |
3011 | while (isdigit(*ftp)) { | |
3012 | ftp++; | |
3013 | digit_found = true; | |
3014 | } | |
3015 | if (!digit_found) { | |
3016 | return CT_FTP_CTL_INVALID; | |
3017 | } | |
3018 | *ftp = 0; | |
3019 | if (!str_to_int(save_ftp, 10, &value)) { | |
3020 | return CT_FTP_CTL_INVALID; | |
3021 | } | |
3022 | ||
3023 | if (value > 255) { | |
3024 | return CT_FTP_CTL_INVALID; | |
3025 | } | |
3026 | ||
78a0b272 | 3027 | port_hs |= value; |
bd5e81a0 DB |
3028 | ovs_be16 port = htons(port_hs); |
3029 | ovs_be32 conn_ipv4_addr; | |
3030 | ||
3031 | switch (mode) { | |
3032 | case CT_FTP_MODE_ACTIVE: | |
cda1b109 DB |
3033 | *v4_addr_rep = conn_for_expectation->rev_key.dst.addr.ipv4; |
3034 | conn_ipv4_addr = conn_for_expectation->key.src.addr.ipv4; | |
bd5e81a0 DB |
3035 | break; |
3036 | case CT_FTP_MODE_PASSIVE: | |
cda1b109 DB |
3037 | *v4_addr_rep = conn_for_expectation->key.dst.addr.ipv4; |
3038 | conn_ipv4_addr = conn_for_expectation->rev_key.src.addr.ipv4; | |
bd5e81a0 | 3039 | break; |
7be77cb0 | 3040 | case CT_TFTP_MODE: |
bd5e81a0 DB |
3041 | default: |
3042 | OVS_NOT_REACHED(); | |
3043 | } | |
3044 | ||
3045 | ovs_be32 ftp_ipv4_addr; | |
3046 | ftp_ipv4_addr = ip_addr.s_addr; | |
3047 | /* Although most servers will block this exploit, there may be some | |
3048 | * less well managed. */ | |
3049 | if (ftp_ipv4_addr != conn_ipv4_addr && ftp_ipv4_addr != *v4_addr_rep) { | |
3050 | return CT_FTP_CTL_INVALID; | |
3051 | } | |
3052 | ||
be38342d DB |
3053 | expectation_create(ct, port, conn_for_expectation, |
3054 | !!(pkt->md.ct_state & CS_REPLY_DIR), false, false); | |
bd5e81a0 DB |
3055 | return CT_FTP_CTL_INTEREST; |
3056 | } | |
3057 | ||
3058 | static char * | |
3059 | skip_ipv6_digits(char *str) | |
3060 | { | |
3061 | while (isxdigit(*str) || *str == ':' || *str == '.') { | |
3062 | str++; | |
3063 | } | |
3064 | return str; | |
3065 | } | |
3066 | ||
3067 | static enum ftp_ctl_pkt | |
3068 | process_ftp_ctl_v6(struct conntrack *ct, | |
3069 | struct dp_packet *pkt, | |
3070 | const struct conn *conn_for_expectation, | |
cda1b109 | 3071 | union ct_addr *v6_addr_rep, char **ftp_data_start, |
bd5e81a0 DB |
3072 | size_t *addr_offset_from_ftp_data_start, |
3073 | size_t *addr_size, enum ct_alg_mode *mode) | |
3074 | { | |
3075 | struct tcp_header *th = dp_packet_l4(pkt); | |
3076 | size_t tcp_hdr_len = TCP_OFFSET(th->tcp_ctl) * 4; | |
3077 | char *tcp_hdr = (char *) th; | |
3078 | char ftp_msg[LARGEST_FTP_MSG_OF_INTEREST + 1] = {0}; | |
bd5e81a0 DB |
3079 | get_ftp_ctl_msg(pkt, ftp_msg); |
3080 | *ftp_data_start = tcp_hdr + tcp_hdr_len; | |
bd5e81a0 DB |
3081 | char *ftp = ftp_msg; |
3082 | struct in6_addr ip6_addr; | |
dec0dbbc | 3083 | |
23bea975 | 3084 | if (!strncasecmp(ftp, FTP_EPRT_CMD, strlen(FTP_EPRT_CMD))) { |
bd5e81a0 DB |
3085 | ftp = ftp_msg + strlen(FTP_EPRT_CMD); |
3086 | ftp = skip_non_digits(ftp); | |
3087 | if (*ftp != FTP_AF_V6 || isdigit(ftp[1])) { | |
3088 | return CT_FTP_CTL_INVALID; | |
3089 | } | |
3090 | /* Jump over delimiter. */ | |
3091 | ftp += 2; | |
3092 | ||
bd5e81a0 | 3093 | memset(&ip6_addr, 0, sizeof ip6_addr); |
dec0dbbc | 3094 | char *ip_addr_start = ftp; |
bd5e81a0 DB |
3095 | *addr_offset_from_ftp_data_start = ip_addr_start - ftp_msg; |
3096 | ftp = skip_ipv6_digits(ftp); | |
3097 | *ftp = 0; | |
3098 | *addr_size = ftp - ip_addr_start; | |
3099 | int rc2 = inet_pton(AF_INET6, ip_addr_start, &ip6_addr); | |
3100 | if (rc2 != 1) { | |
3101 | return CT_FTP_CTL_INVALID; | |
3102 | } | |
3103 | ftp++; | |
3104 | *mode = CT_FTP_MODE_ACTIVE; | |
3105 | } else { | |
3106 | ftp = ftp_msg + strcspn(ftp_msg, "("); | |
3107 | ftp = skip_non_digits(ftp); | |
3108 | if (!isdigit(*ftp)) { | |
3109 | return CT_FTP_CTL_INVALID; | |
3110 | } | |
3111 | ||
3112 | /* Not used for passive mode. */ | |
3113 | *addr_offset_from_ftp_data_start = 0; | |
3114 | *addr_size = 0; | |
3115 | ||
3116 | *mode = CT_FTP_MODE_PASSIVE; | |
3117 | } | |
3118 | ||
3119 | char *save_ftp = ftp; | |
3120 | ftp = terminate_number_str(ftp, MAX_EXT_FTP_PORT_DGTS); | |
3121 | if (!ftp) { | |
3122 | return CT_FTP_CTL_INVALID; | |
3123 | } | |
dec0dbbc | 3124 | |
bd5e81a0 DB |
3125 | int value; |
3126 | if (!str_to_int(save_ftp, 10, &value)) { | |
3127 | return CT_FTP_CTL_INVALID; | |
3128 | } | |
3129 | if (value > CT_MAX_L4_PORT) { | |
3130 | return CT_FTP_CTL_INVALID; | |
3131 | } | |
3132 | ||
3133 | uint16_t port_hs = value; | |
3134 | ovs_be16 port = htons(port_hs); | |
3135 | ||
3136 | switch (*mode) { | |
3137 | case CT_FTP_MODE_ACTIVE: | |
3138 | *v6_addr_rep = conn_for_expectation->rev_key.dst.addr; | |
3139 | /* Although most servers will block this exploit, there may be some | |
3140 | * less well managed. */ | |
cda1b109 DB |
3141 | if (memcmp(&ip6_addr, &v6_addr_rep->ipv6, sizeof ip6_addr) && |
3142 | memcmp(&ip6_addr, &conn_for_expectation->key.src.addr.ipv6, | |
bd5e81a0 DB |
3143 | sizeof ip6_addr)) { |
3144 | return CT_FTP_CTL_INVALID; | |
3145 | } | |
3146 | break; | |
3147 | case CT_FTP_MODE_PASSIVE: | |
3148 | *v6_addr_rep = conn_for_expectation->key.dst.addr; | |
3149 | break; | |
7be77cb0 | 3150 | case CT_TFTP_MODE: |
bd5e81a0 DB |
3151 | default: |
3152 | OVS_NOT_REACHED(); | |
3153 | } | |
3154 | ||
be38342d DB |
3155 | expectation_create(ct, port, conn_for_expectation, |
3156 | !!(pkt->md.ct_state & CS_REPLY_DIR), false, false); | |
bd5e81a0 DB |
3157 | return CT_FTP_CTL_INTEREST; |
3158 | } | |
3159 | ||
3160 | static int | |
cda1b109 | 3161 | repl_ftp_v6_addr(struct dp_packet *pkt, union ct_addr v6_addr_rep, |
bd5e81a0 DB |
3162 | char *ftp_data_start, |
3163 | size_t addr_offset_from_ftp_data_start, | |
3164 | size_t addr_size, enum ct_alg_mode mode) | |
3165 | { | |
3166 | /* This is slightly bigger than really possible. */ | |
3167 | enum { MAX_FTP_V6_NAT_DELTA = 45 }; | |
3168 | ||
3169 | if (mode == CT_FTP_MODE_PASSIVE) { | |
3170 | return 0; | |
3171 | } | |
3172 | ||
3173 | /* Do conservative check for pathological MTU usage. */ | |
3174 | uint32_t orig_used_size = dp_packet_size(pkt); | |
cd7c99a6 DB |
3175 | if (orig_used_size + MAX_FTP_V6_NAT_DELTA > |
3176 | dp_packet_get_allocated(pkt)) { | |
3177 | ||
bd5e81a0 | 3178 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5); |
cd7c99a6 DB |
3179 | VLOG_WARN_RL(&rl, "Unsupported effective MTU %u used with FTP V6", |
3180 | dp_packet_get_allocated(pkt)); | |
bd5e81a0 DB |
3181 | return 0; |
3182 | } | |
3183 | ||
298530b8 | 3184 | char v6_addr_str[INET6_ADDRSTRLEN] = {0}; |
cda1b109 | 3185 | ovs_assert(inet_ntop(AF_INET6, &v6_addr_rep.ipv6, v6_addr_str, |
298530b8 | 3186 | sizeof v6_addr_str)); |
cd7c99a6 DB |
3187 | modify_packet(pkt, ftp_data_start + addr_offset_from_ftp_data_start, |
3188 | addr_size, v6_addr_str, strlen(v6_addr_str), | |
3189 | orig_used_size); | |
3190 | return (int) strlen(v6_addr_str) - (int) addr_size; | |
bd5e81a0 DB |
3191 | } |
3192 | ||
d13d7115 DB |
3193 | /* Increment/decrement a TCP sequence number. */ |
3194 | static void | |
3195 | adj_seqnum(ovs_16aligned_be32 *val, int32_t inc) | |
3196 | { | |
3197 | put_16aligned_be32(val, htonl(ntohl(get_16aligned_be32(val)) + inc)); | |
3198 | } | |
3199 | ||
bd5e81a0 DB |
3200 | static void |
3201 | handle_ftp_ctl(struct conntrack *ct, const struct conn_lookup_ctx *ctx, | |
967bb5c5 | 3202 | struct dp_packet *pkt, struct conn *ec, long long now, |
253e4dc0 | 3203 | enum ftp_ctl_pkt ftp_ctl, bool nat) |
bd5e81a0 DB |
3204 | { |
3205 | struct ip_header *l3_hdr = dp_packet_l3(pkt); | |
3206 | ovs_be32 v4_addr_rep = 0; | |
cda1b109 | 3207 | union ct_addr v6_addr_rep; |
faa0826d | 3208 | size_t addr_offset_from_ftp_data_start = 0; |
bd5e81a0 DB |
3209 | size_t addr_size = 0; |
3210 | char *ftp_data_start; | |
bd5e81a0 DB |
3211 | enum ct_alg_mode mode = CT_FTP_MODE_ACTIVE; |
3212 | ||
3213 | if (detect_ftp_ctl_type(ctx, pkt) != ftp_ctl) { | |
3214 | return; | |
3215 | } | |
3216 | ||
bd5e81a0 DB |
3217 | struct ovs_16aligned_ip6_hdr *nh6 = dp_packet_l3(pkt); |
3218 | int64_t seq_skew = 0; | |
dec0dbbc | 3219 | |
253e4dc0 | 3220 | if (ftp_ctl == CT_FTP_CTL_INTEREST) { |
bd5e81a0 DB |
3221 | enum ftp_ctl_pkt rc; |
3222 | if (ctx->key.dl_type == htons(ETH_TYPE_IPV6)) { | |
253e4dc0 | 3223 | rc = process_ftp_ctl_v6(ct, pkt, ec, |
4417ca3d | 3224 | &v6_addr_rep, &ftp_data_start, |
bd5e81a0 DB |
3225 | &addr_offset_from_ftp_data_start, |
3226 | &addr_size, &mode); | |
3227 | } else { | |
253e4dc0 | 3228 | rc = process_ftp_ctl_v4(ct, pkt, ec, |
4417ca3d | 3229 | &v4_addr_rep, &ftp_data_start, |
cd7c99a6 DB |
3230 | &addr_offset_from_ftp_data_start, |
3231 | &addr_size); | |
bd5e81a0 DB |
3232 | } |
3233 | if (rc == CT_FTP_CTL_INVALID) { | |
3234 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5); | |
3235 | VLOG_WARN_RL(&rl, "Invalid FTP control packet format"); | |
3236 | pkt->md.ct_state |= CS_TRACKED | CS_INVALID; | |
3237 | return; | |
3238 | } else if (rc == CT_FTP_CTL_INTEREST) { | |
3239 | uint16_t ip_len; | |
dec0dbbc | 3240 | |
bd5e81a0 | 3241 | if (ctx->key.dl_type == htons(ETH_TYPE_IPV6)) { |
253e4dc0 DM |
3242 | if (nat) { |
3243 | seq_skew = repl_ftp_v6_addr(pkt, v6_addr_rep, | |
3244 | ftp_data_start, | |
3245 | addr_offset_from_ftp_data_start, | |
3246 | addr_size, mode); | |
3247 | } | |
3248 | ||
bd5e81a0 | 3249 | if (seq_skew) { |
253e4dc0 DM |
3250 | ip_len = ntohs(nh6->ip6_ctlun.ip6_un1.ip6_un1_plen) + |
3251 | seq_skew; | |
bd5e81a0 | 3252 | nh6->ip6_ctlun.ip6_un1.ip6_un1_plen = htons(ip_len); |
bd5e81a0 DB |
3253 | } |
3254 | } else { | |
253e4dc0 DM |
3255 | if (nat) { |
3256 | seq_skew = repl_ftp_v4_addr(pkt, v4_addr_rep, | |
3257 | ftp_data_start, | |
cd7c99a6 DB |
3258 | addr_offset_from_ftp_data_start, |
3259 | addr_size); | |
253e4dc0 | 3260 | } |
bd5e81a0 | 3261 | if (seq_skew) { |
253e4dc0 | 3262 | ip_len = ntohs(l3_hdr->ip_tot_len) + seq_skew; |
29cf9c1b FL |
3263 | if (!dp_packet_hwol_is_ipv4(pkt)) { |
3264 | l3_hdr->ip_csum = recalc_csum16(l3_hdr->ip_csum, | |
3265 | l3_hdr->ip_tot_len, | |
3266 | htons(ip_len)); | |
3267 | } | |
bd5e81a0 | 3268 | l3_hdr->ip_tot_len = htons(ip_len); |
bd5e81a0 DB |
3269 | } |
3270 | } | |
3271 | } else { | |
3272 | OVS_NOT_REACHED(); | |
3273 | } | |
bd5e81a0 DB |
3274 | } |
3275 | ||
3276 | struct tcp_header *th = dp_packet_l4(pkt); | |
dec0dbbc | 3277 | |
253e4dc0 | 3278 | if (nat && ec->seq_skew != 0) { |
d13d7115 DB |
3279 | ctx->reply != ec->seq_skew_dir ? |
3280 | adj_seqnum(&th->tcp_ack, -ec->seq_skew) : | |
3281 | adj_seqnum(&th->tcp_seq, ec->seq_skew); | |
bd5e81a0 DB |
3282 | } |
3283 | ||
bd5e81a0 | 3284 | th->tcp_csum = 0; |
29cf9c1b FL |
3285 | if (!dp_packet_hwol_tx_l4_checksum(pkt)) { |
3286 | if (ctx->key.dl_type == htons(ETH_TYPE_IPV6)) { | |
3287 | th->tcp_csum = packet_csum_upperlayer6(nh6, th, ctx->key.nw_proto, | |
3288 | dp_packet_l4_size(pkt)); | |
3289 | } else { | |
3290 | uint32_t tcp_csum = packet_csum_pseudoheader(l3_hdr); | |
3291 | th->tcp_csum = csum_finish( | |
3292 | csum_continue(tcp_csum, th, dp_packet_l4_size(pkt))); | |
3293 | } | |
bd5e81a0 | 3294 | } |
253e4dc0 DM |
3295 | |
3296 | if (seq_skew) { | |
967bb5c5 | 3297 | conn_seq_skew_set(ct, ec, now, seq_skew + ec->seq_skew, |
253e4dc0 DM |
3298 | ctx->reply); |
3299 | } | |
bd5e81a0 | 3300 | } |
7be77cb0 DB |
3301 | |
3302 | static void | |
3303 | handle_tftp_ctl(struct conntrack *ct, | |
94e71143 | 3304 | const struct conn_lookup_ctx *ctx OVS_UNUSED, |
967bb5c5 DB |
3305 | struct dp_packet *pkt, struct conn *conn_for_expectation, |
3306 | long long now OVS_UNUSED, enum ftp_ctl_pkt ftp_ctl OVS_UNUSED, | |
3307 | bool nat OVS_UNUSED) | |
7be77cb0 | 3308 | { |
be38342d DB |
3309 | expectation_create(ct, conn_for_expectation->key.src.port, |
3310 | conn_for_expectation, | |
3311 | !!(pkt->md.ct_state & CS_REPLY_DIR), false, false); | |
7be77cb0 | 3312 | } |