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e5dfb815 PM |
1 | /* |
2 | * net/sched/cls_flow.c Generic flow classifier | |
3 | * | |
4 | * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/jhash.h> | |
16 | #include <linux/random.h> | |
17 | #include <linux/pkt_cls.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/ipv6.h> | |
9ec13810 | 22 | #include <linux/if_vlan.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
3a9a231d | 24 | #include <linux/module.h> |
743b2a66 | 25 | #include <net/inet_sock.h> |
e5dfb815 PM |
26 | |
27 | #include <net/pkt_cls.h> | |
28 | #include <net/ip.h> | |
29 | #include <net/route.h> | |
1bd758eb | 30 | #include <net/flow_dissector.h> |
6bd2a9af | 31 | |
0013de38 | 32 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
e5dfb815 PM |
33 | #include <net/netfilter/nf_conntrack.h> |
34 | #endif | |
35 | ||
36 | struct flow_head { | |
37 | struct list_head filters; | |
70da9f0b | 38 | struct rcu_head rcu; |
e5dfb815 PM |
39 | }; |
40 | ||
41 | struct flow_filter { | |
42 | struct list_head list; | |
43 | struct tcf_exts exts; | |
44 | struct tcf_ematch_tree ematches; | |
70da9f0b | 45 | struct tcf_proto *tp; |
72d9794f PM |
46 | struct timer_list perturb_timer; |
47 | u32 perturb_period; | |
e5dfb815 PM |
48 | u32 handle; |
49 | ||
50 | u32 nkeys; | |
51 | u32 keymask; | |
52 | u32 mode; | |
53 | u32 mask; | |
54 | u32 xor; | |
55 | u32 rshift; | |
56 | u32 addend; | |
57 | u32 divisor; | |
58 | u32 baseclass; | |
72d9794f | 59 | u32 hashrnd; |
7afe8e4f | 60 | struct rcu_work rwork; |
e5dfb815 PM |
61 | }; |
62 | ||
e5dfb815 PM |
63 | static inline u32 addr_fold(void *addr) |
64 | { | |
65 | unsigned long a = (unsigned long)addr; | |
66 | ||
67 | return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0); | |
68 | } | |
69 | ||
6bd2a9af | 70 | static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 71 | { |
c3f83241 TH |
72 | __be32 src = flow_get_u32_src(flow); |
73 | ||
74 | if (src) | |
75 | return ntohl(src); | |
76 | ||
4b95c3d4 | 77 | return addr_fold(skb->sk); |
e5dfb815 PM |
78 | } |
79 | ||
6bd2a9af | 80 | static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 81 | { |
c3f83241 TH |
82 | __be32 dst = flow_get_u32_dst(flow); |
83 | ||
84 | if (dst) | |
85 | return ntohl(dst); | |
86 | ||
d8b9605d | 87 | return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb); |
e5dfb815 PM |
88 | } |
89 | ||
5a7a5555 JHS |
90 | static u32 flow_get_proto(const struct sk_buff *skb, |
91 | const struct flow_keys *flow) | |
e5dfb815 | 92 | { |
06635a35 | 93 | return flow->basic.ip_proto; |
e5dfb815 PM |
94 | } |
95 | ||
5a7a5555 JHS |
96 | static u32 flow_get_proto_src(const struct sk_buff *skb, |
97 | const struct flow_keys *flow) | |
e5dfb815 | 98 | { |
06635a35 | 99 | if (flow->ports.ports) |
59346afe | 100 | return ntohs(flow->ports.src); |
e5dfb815 | 101 | |
859c2012 ED |
102 | return addr_fold(skb->sk); |
103 | } | |
104 | ||
5a7a5555 JHS |
105 | static u32 flow_get_proto_dst(const struct sk_buff *skb, |
106 | const struct flow_keys *flow) | |
859c2012 | 107 | { |
06635a35 | 108 | if (flow->ports.ports) |
59346afe | 109 | return ntohs(flow->ports.dst); |
e5dfb815 | 110 | |
d8b9605d | 111 | return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb); |
e5dfb815 PM |
112 | } |
113 | ||
114 | static u32 flow_get_iif(const struct sk_buff *skb) | |
115 | { | |
8964be4a | 116 | return skb->skb_iif; |
e5dfb815 PM |
117 | } |
118 | ||
119 | static u32 flow_get_priority(const struct sk_buff *skb) | |
120 | { | |
121 | return skb->priority; | |
122 | } | |
123 | ||
124 | static u32 flow_get_mark(const struct sk_buff *skb) | |
125 | { | |
126 | return skb->mark; | |
127 | } | |
128 | ||
129 | static u32 flow_get_nfct(const struct sk_buff *skb) | |
130 | { | |
0013de38 | 131 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
cb9c6836 | 132 | return addr_fold(skb_nfct(skb)); |
e5dfb815 PM |
133 | #else |
134 | return 0; | |
135 | #endif | |
136 | } | |
137 | ||
0013de38 | 138 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
e5dfb815 PM |
139 | #define CTTUPLE(skb, member) \ |
140 | ({ \ | |
141 | enum ip_conntrack_info ctinfo; \ | |
859c2012 | 142 | const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \ |
e5dfb815 PM |
143 | if (ct == NULL) \ |
144 | goto fallback; \ | |
145 | ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \ | |
146 | }) | |
147 | #else | |
148 | #define CTTUPLE(skb, member) \ | |
149 | ({ \ | |
150 | goto fallback; \ | |
151 | 0; \ | |
152 | }) | |
153 | #endif | |
154 | ||
5a7a5555 JHS |
155 | static u32 flow_get_nfct_src(const struct sk_buff *skb, |
156 | const struct flow_keys *flow) | |
e5dfb815 | 157 | { |
d8b9605d | 158 | switch (tc_skb_protocol(skb)) { |
60678040 | 159 | case htons(ETH_P_IP): |
e5dfb815 | 160 | return ntohl(CTTUPLE(skb, src.u3.ip)); |
60678040 | 161 | case htons(ETH_P_IPV6): |
e5dfb815 PM |
162 | return ntohl(CTTUPLE(skb, src.u3.ip6[3])); |
163 | } | |
164 | fallback: | |
6bd2a9af | 165 | return flow_get_src(skb, flow); |
e5dfb815 PM |
166 | } |
167 | ||
5a7a5555 JHS |
168 | static u32 flow_get_nfct_dst(const struct sk_buff *skb, |
169 | const struct flow_keys *flow) | |
e5dfb815 | 170 | { |
d8b9605d | 171 | switch (tc_skb_protocol(skb)) { |
60678040 | 172 | case htons(ETH_P_IP): |
e5dfb815 | 173 | return ntohl(CTTUPLE(skb, dst.u3.ip)); |
60678040 | 174 | case htons(ETH_P_IPV6): |
e5dfb815 PM |
175 | return ntohl(CTTUPLE(skb, dst.u3.ip6[3])); |
176 | } | |
177 | fallback: | |
6bd2a9af | 178 | return flow_get_dst(skb, flow); |
e5dfb815 PM |
179 | } |
180 | ||
5a7a5555 JHS |
181 | static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, |
182 | const struct flow_keys *flow) | |
e5dfb815 PM |
183 | { |
184 | return ntohs(CTTUPLE(skb, src.u.all)); | |
185 | fallback: | |
6bd2a9af | 186 | return flow_get_proto_src(skb, flow); |
e5dfb815 PM |
187 | } |
188 | ||
5a7a5555 JHS |
189 | static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, |
190 | const struct flow_keys *flow) | |
e5dfb815 PM |
191 | { |
192 | return ntohs(CTTUPLE(skb, dst.u.all)); | |
193 | fallback: | |
6bd2a9af | 194 | return flow_get_proto_dst(skb, flow); |
e5dfb815 PM |
195 | } |
196 | ||
197 | static u32 flow_get_rtclassid(const struct sk_buff *skb) | |
198 | { | |
c7066f70 | 199 | #ifdef CONFIG_IP_ROUTE_CLASSID |
adf30907 ED |
200 | if (skb_dst(skb)) |
201 | return skb_dst(skb)->tclassid; | |
e5dfb815 PM |
202 | #endif |
203 | return 0; | |
204 | } | |
205 | ||
206 | static u32 flow_get_skuid(const struct sk_buff *skb) | |
207 | { | |
743b2a66 ED |
208 | struct sock *sk = skb_to_full_sk(skb); |
209 | ||
210 | if (sk && sk->sk_socket && sk->sk_socket->file) { | |
211 | kuid_t skuid = sk->sk_socket->file->f_cred->fsuid; | |
212 | ||
a6c6796c EB |
213 | return from_kuid(&init_user_ns, skuid); |
214 | } | |
e5dfb815 PM |
215 | return 0; |
216 | } | |
217 | ||
218 | static u32 flow_get_skgid(const struct sk_buff *skb) | |
219 | { | |
743b2a66 ED |
220 | struct sock *sk = skb_to_full_sk(skb); |
221 | ||
222 | if (sk && sk->sk_socket && sk->sk_socket->file) { | |
223 | kgid_t skgid = sk->sk_socket->file->f_cred->fsgid; | |
224 | ||
a6c6796c EB |
225 | return from_kgid(&init_user_ns, skgid); |
226 | } | |
e5dfb815 PM |
227 | return 0; |
228 | } | |
229 | ||
9ec13810 PM |
230 | static u32 flow_get_vlan_tag(const struct sk_buff *skb) |
231 | { | |
232 | u16 uninitialized_var(tag); | |
233 | ||
234 | if (vlan_get_tag(skb, &tag) < 0) | |
235 | return 0; | |
236 | return tag & VLAN_VID_MASK; | |
237 | } | |
238 | ||
739a91ef CG |
239 | static u32 flow_get_rxhash(struct sk_buff *skb) |
240 | { | |
3958afa1 | 241 | return skb_get_hash(skb); |
739a91ef CG |
242 | } |
243 | ||
6bd2a9af | 244 | static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow) |
e5dfb815 PM |
245 | { |
246 | switch (key) { | |
247 | case FLOW_KEY_SRC: | |
6bd2a9af | 248 | return flow_get_src(skb, flow); |
e5dfb815 | 249 | case FLOW_KEY_DST: |
6bd2a9af | 250 | return flow_get_dst(skb, flow); |
e5dfb815 | 251 | case FLOW_KEY_PROTO: |
6bd2a9af | 252 | return flow_get_proto(skb, flow); |
e5dfb815 | 253 | case FLOW_KEY_PROTO_SRC: |
6bd2a9af | 254 | return flow_get_proto_src(skb, flow); |
e5dfb815 | 255 | case FLOW_KEY_PROTO_DST: |
6bd2a9af | 256 | return flow_get_proto_dst(skb, flow); |
e5dfb815 PM |
257 | case FLOW_KEY_IIF: |
258 | return flow_get_iif(skb); | |
259 | case FLOW_KEY_PRIORITY: | |
260 | return flow_get_priority(skb); | |
261 | case FLOW_KEY_MARK: | |
262 | return flow_get_mark(skb); | |
263 | case FLOW_KEY_NFCT: | |
264 | return flow_get_nfct(skb); | |
265 | case FLOW_KEY_NFCT_SRC: | |
6bd2a9af | 266 | return flow_get_nfct_src(skb, flow); |
e5dfb815 | 267 | case FLOW_KEY_NFCT_DST: |
6bd2a9af | 268 | return flow_get_nfct_dst(skb, flow); |
e5dfb815 | 269 | case FLOW_KEY_NFCT_PROTO_SRC: |
6bd2a9af | 270 | return flow_get_nfct_proto_src(skb, flow); |
e5dfb815 | 271 | case FLOW_KEY_NFCT_PROTO_DST: |
6bd2a9af | 272 | return flow_get_nfct_proto_dst(skb, flow); |
e5dfb815 PM |
273 | case FLOW_KEY_RTCLASSID: |
274 | return flow_get_rtclassid(skb); | |
275 | case FLOW_KEY_SKUID: | |
276 | return flow_get_skuid(skb); | |
277 | case FLOW_KEY_SKGID: | |
278 | return flow_get_skgid(skb); | |
9ec13810 PM |
279 | case FLOW_KEY_VLAN_TAG: |
280 | return flow_get_vlan_tag(skb); | |
739a91ef CG |
281 | case FLOW_KEY_RXHASH: |
282 | return flow_get_rxhash(skb); | |
e5dfb815 PM |
283 | default: |
284 | WARN_ON(1); | |
285 | return 0; | |
286 | } | |
287 | } | |
288 | ||
6bd2a9af ED |
289 | #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \ |
290 | (1 << FLOW_KEY_DST) | \ | |
291 | (1 << FLOW_KEY_PROTO) | \ | |
292 | (1 << FLOW_KEY_PROTO_SRC) | \ | |
293 | (1 << FLOW_KEY_PROTO_DST) | \ | |
294 | (1 << FLOW_KEY_NFCT_SRC) | \ | |
295 | (1 << FLOW_KEY_NFCT_DST) | \ | |
296 | (1 << FLOW_KEY_NFCT_PROTO_SRC) | \ | |
297 | (1 << FLOW_KEY_NFCT_PROTO_DST)) | |
298 | ||
dc7f9f6e | 299 | static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
e5dfb815 PM |
300 | struct tcf_result *res) |
301 | { | |
70da9f0b | 302 | struct flow_head *head = rcu_dereference_bh(tp->root); |
e5dfb815 PM |
303 | struct flow_filter *f; |
304 | u32 keymask; | |
305 | u32 classid; | |
306 | unsigned int n, key; | |
307 | int r; | |
308 | ||
70da9f0b | 309 | list_for_each_entry_rcu(f, &head->filters, list) { |
3a53943b | 310 | u32 keys[FLOW_KEY_MAX + 1]; |
6bd2a9af | 311 | struct flow_keys flow_keys; |
e5dfb815 PM |
312 | |
313 | if (!tcf_em_tree_match(skb, &f->ematches, NULL)) | |
314 | continue; | |
315 | ||
316 | keymask = f->keymask; | |
6bd2a9af | 317 | if (keymask & FLOW_KEYS_NEEDED) |
cd79a238 | 318 | skb_flow_dissect_flow_keys(skb, &flow_keys, 0); |
e5dfb815 PM |
319 | |
320 | for (n = 0; n < f->nkeys; n++) { | |
321 | key = ffs(keymask) - 1; | |
322 | keymask &= ~(1 << key); | |
6bd2a9af | 323 | keys[n] = flow_key_get(skb, key, &flow_keys); |
e5dfb815 PM |
324 | } |
325 | ||
326 | if (f->mode == FLOW_MODE_HASH) | |
72d9794f | 327 | classid = jhash2(keys, f->nkeys, f->hashrnd); |
e5dfb815 PM |
328 | else { |
329 | classid = keys[0]; | |
330 | classid = (classid & f->mask) ^ f->xor; | |
331 | classid = (classid >> f->rshift) + f->addend; | |
332 | } | |
333 | ||
334 | if (f->divisor) | |
335 | classid %= f->divisor; | |
336 | ||
337 | res->class = 0; | |
338 | res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid); | |
339 | ||
340 | r = tcf_exts_exec(skb, &f->exts, res); | |
341 | if (r < 0) | |
342 | continue; | |
343 | return r; | |
344 | } | |
345 | return -1; | |
346 | } | |
347 | ||
cdeabbb8 | 348 | static void flow_perturbation(struct timer_list *t) |
72d9794f | 349 | { |
cdeabbb8 | 350 | struct flow_filter *f = from_timer(f, t, perturb_timer); |
72d9794f PM |
351 | |
352 | get_random_bytes(&f->hashrnd, 4); | |
353 | if (f->perturb_period) | |
354 | mod_timer(&f->perturb_timer, jiffies + f->perturb_period); | |
355 | } | |
356 | ||
e5dfb815 PM |
357 | static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = { |
358 | [TCA_FLOW_KEYS] = { .type = NLA_U32 }, | |
359 | [TCA_FLOW_MODE] = { .type = NLA_U32 }, | |
360 | [TCA_FLOW_BASECLASS] = { .type = NLA_U32 }, | |
361 | [TCA_FLOW_RSHIFT] = { .type = NLA_U32 }, | |
362 | [TCA_FLOW_ADDEND] = { .type = NLA_U32 }, | |
363 | [TCA_FLOW_MASK] = { .type = NLA_U32 }, | |
364 | [TCA_FLOW_XOR] = { .type = NLA_U32 }, | |
365 | [TCA_FLOW_DIVISOR] = { .type = NLA_U32 }, | |
366 | [TCA_FLOW_ACT] = { .type = NLA_NESTED }, | |
367 | [TCA_FLOW_POLICE] = { .type = NLA_NESTED }, | |
368 | [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED }, | |
72d9794f | 369 | [TCA_FLOW_PERTURB] = { .type = NLA_U32 }, |
e5dfb815 PM |
370 | }; |
371 | ||
22f7cec9 | 372 | static void __flow_destroy_filter(struct flow_filter *f) |
70da9f0b | 373 | { |
70da9f0b | 374 | del_timer_sync(&f->perturb_timer); |
18d0264f | 375 | tcf_exts_destroy(&f->exts); |
82a470f1 | 376 | tcf_em_tree_destroy(&f->ematches); |
22f7cec9 | 377 | tcf_exts_put_net(&f->exts); |
70da9f0b | 378 | kfree(f); |
22f7cec9 CW |
379 | } |
380 | ||
381 | static void flow_destroy_filter_work(struct work_struct *work) | |
382 | { | |
7afe8e4f CW |
383 | struct flow_filter *f = container_of(to_rcu_work(work), |
384 | struct flow_filter, | |
385 | rwork); | |
22f7cec9 CW |
386 | rtnl_lock(); |
387 | __flow_destroy_filter(f); | |
94cdb475 CW |
388 | rtnl_unlock(); |
389 | } | |
390 | ||
c1b52739 | 391 | static int flow_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 392 | struct tcf_proto *tp, unsigned long base, |
e5dfb815 | 393 | u32 handle, struct nlattr **tca, |
8113c095 | 394 | void **arg, bool ovr) |
e5dfb815 | 395 | { |
70da9f0b JF |
396 | struct flow_head *head = rtnl_dereference(tp->root); |
397 | struct flow_filter *fold, *fnew; | |
e5dfb815 PM |
398 | struct nlattr *opt = tca[TCA_OPTIONS]; |
399 | struct nlattr *tb[TCA_FLOW_MAX + 1]; | |
e5dfb815 | 400 | unsigned int nkeys = 0; |
72d9794f | 401 | unsigned int perturb_period = 0; |
e5dfb815 PM |
402 | u32 baseclass = 0; |
403 | u32 keymask = 0; | |
404 | u32 mode; | |
405 | int err; | |
406 | ||
407 | if (opt == NULL) | |
408 | return -EINVAL; | |
409 | ||
fceb6435 | 410 | err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy, NULL); |
e5dfb815 PM |
411 | if (err < 0) |
412 | return err; | |
413 | ||
414 | if (tb[TCA_FLOW_BASECLASS]) { | |
415 | baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]); | |
416 | if (TC_H_MIN(baseclass) == 0) | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
420 | if (tb[TCA_FLOW_KEYS]) { | |
421 | keymask = nla_get_u32(tb[TCA_FLOW_KEYS]); | |
e5dfb815 PM |
422 | |
423 | nkeys = hweight32(keymask); | |
424 | if (nkeys == 0) | |
425 | return -EINVAL; | |
4f250491 PM |
426 | |
427 | if (fls(keymask) - 1 > FLOW_KEY_MAX) | |
428 | return -EOPNOTSUPP; | |
a6c6796c EB |
429 | |
430 | if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) && | |
e32123e5 | 431 | sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns) |
a6c6796c | 432 | return -EOPNOTSUPP; |
e5dfb815 PM |
433 | } |
434 | ||
70da9f0b JF |
435 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
436 | if (!fnew) | |
c09fc2e1 | 437 | return -ENOBUFS; |
4ebc1e3c JP |
438 | |
439 | err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches); | |
440 | if (err < 0) | |
c09fc2e1 | 441 | goto err1; |
70da9f0b | 442 | |
fb6ad63b | 443 | err = tcf_exts_init(&fnew->exts, net, TCA_FLOW_ACT, TCA_FLOW_POLICE); |
b9a24bb7 | 444 | if (err < 0) |
c09fc2e1 JP |
445 | goto err2; |
446 | ||
447 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, ovr); | |
448 | if (err < 0) | |
449 | goto err2; | |
32b2f4b1 | 450 | |
8113c095 | 451 | fold = *arg; |
70da9f0b | 452 | if (fold) { |
e5dfb815 | 453 | err = -EINVAL; |
70da9f0b | 454 | if (fold->handle != handle && handle) |
c09fc2e1 | 455 | goto err2; |
e5dfb815 | 456 | |
70da9f0b | 457 | /* Copy fold into fnew */ |
70da9f0b | 458 | fnew->tp = fold->tp; |
70da9f0b JF |
459 | fnew->handle = fold->handle; |
460 | fnew->nkeys = fold->nkeys; | |
461 | fnew->keymask = fold->keymask; | |
462 | fnew->mode = fold->mode; | |
463 | fnew->mask = fold->mask; | |
464 | fnew->xor = fold->xor; | |
465 | fnew->rshift = fold->rshift; | |
466 | fnew->addend = fold->addend; | |
467 | fnew->divisor = fold->divisor; | |
468 | fnew->baseclass = fold->baseclass; | |
469 | fnew->hashrnd = fold->hashrnd; | |
470 | ||
471 | mode = fold->mode; | |
e5dfb815 PM |
472 | if (tb[TCA_FLOW_MODE]) |
473 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); | |
474 | if (mode != FLOW_MODE_HASH && nkeys > 1) | |
c09fc2e1 | 475 | goto err2; |
72d9794f PM |
476 | |
477 | if (mode == FLOW_MODE_HASH) | |
70da9f0b | 478 | perturb_period = fold->perturb_period; |
72d9794f PM |
479 | if (tb[TCA_FLOW_PERTURB]) { |
480 | if (mode != FLOW_MODE_HASH) | |
c09fc2e1 | 481 | goto err2; |
72d9794f PM |
482 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; |
483 | } | |
e5dfb815 PM |
484 | } else { |
485 | err = -EINVAL; | |
486 | if (!handle) | |
c09fc2e1 | 487 | goto err2; |
e5dfb815 | 488 | if (!tb[TCA_FLOW_KEYS]) |
c09fc2e1 | 489 | goto err2; |
e5dfb815 PM |
490 | |
491 | mode = FLOW_MODE_MAP; | |
492 | if (tb[TCA_FLOW_MODE]) | |
493 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); | |
494 | if (mode != FLOW_MODE_HASH && nkeys > 1) | |
c09fc2e1 | 495 | goto err2; |
e5dfb815 | 496 | |
72d9794f PM |
497 | if (tb[TCA_FLOW_PERTURB]) { |
498 | if (mode != FLOW_MODE_HASH) | |
c09fc2e1 | 499 | goto err2; |
72d9794f PM |
500 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; |
501 | } | |
502 | ||
1abf2720 JP |
503 | if (TC_H_MAJ(baseclass) == 0) { |
504 | struct Qdisc *q = tcf_block_q(tp->chain->block); | |
505 | ||
506 | baseclass = TC_H_MAKE(q->handle, baseclass); | |
507 | } | |
e5dfb815 PM |
508 | if (TC_H_MIN(baseclass) == 0) |
509 | baseclass = TC_H_MAKE(baseclass, 1); | |
510 | ||
70da9f0b JF |
511 | fnew->handle = handle; |
512 | fnew->mask = ~0U; | |
513 | fnew->tp = tp; | |
514 | get_random_bytes(&fnew->hashrnd, 4); | |
e5dfb815 PM |
515 | } |
516 | ||
cdeabbb8 | 517 | timer_setup(&fnew->perturb_timer, flow_perturbation, TIMER_DEFERRABLE); |
e5dfb815 | 518 | |
02875878 ED |
519 | netif_keep_dst(qdisc_dev(tp->q)); |
520 | ||
e5dfb815 | 521 | if (tb[TCA_FLOW_KEYS]) { |
70da9f0b JF |
522 | fnew->keymask = keymask; |
523 | fnew->nkeys = nkeys; | |
e5dfb815 PM |
524 | } |
525 | ||
70da9f0b | 526 | fnew->mode = mode; |
e5dfb815 PM |
527 | |
528 | if (tb[TCA_FLOW_MASK]) | |
70da9f0b | 529 | fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]); |
e5dfb815 | 530 | if (tb[TCA_FLOW_XOR]) |
70da9f0b | 531 | fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]); |
e5dfb815 | 532 | if (tb[TCA_FLOW_RSHIFT]) |
70da9f0b | 533 | fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]); |
e5dfb815 | 534 | if (tb[TCA_FLOW_ADDEND]) |
70da9f0b | 535 | fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]); |
e5dfb815 PM |
536 | |
537 | if (tb[TCA_FLOW_DIVISOR]) | |
70da9f0b | 538 | fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]); |
e5dfb815 | 539 | if (baseclass) |
70da9f0b | 540 | fnew->baseclass = baseclass; |
e5dfb815 | 541 | |
70da9f0b | 542 | fnew->perturb_period = perturb_period; |
72d9794f | 543 | if (perturb_period) |
70da9f0b | 544 | mod_timer(&fnew->perturb_timer, jiffies + perturb_period); |
72d9794f | 545 | |
8113c095 | 546 | if (!*arg) |
70da9f0b JF |
547 | list_add_tail_rcu(&fnew->list, &head->filters); |
548 | else | |
32b2f4b1 | 549 | list_replace_rcu(&fold->list, &fnew->list); |
e5dfb815 | 550 | |
8113c095 | 551 | *arg = fnew; |
e5dfb815 | 552 | |
22f7cec9 CW |
553 | if (fold) { |
554 | tcf_exts_get_net(&fold->exts); | |
7afe8e4f | 555 | tcf_queue_work(&fold->rwork, flow_destroy_filter_work); |
22f7cec9 | 556 | } |
e5dfb815 PM |
557 | return 0; |
558 | ||
c09fc2e1 | 559 | err2: |
b9a24bb7 | 560 | tcf_exts_destroy(&fnew->exts); |
4ebc1e3c | 561 | tcf_em_tree_destroy(&fnew->ematches); |
e5dfb815 | 562 | err1: |
c09fc2e1 | 563 | kfree(fnew); |
e5dfb815 PM |
564 | return err; |
565 | } | |
566 | ||
8113c095 | 567 | static int flow_delete(struct tcf_proto *tp, void *arg, bool *last) |
e5dfb815 | 568 | { |
763dbf63 | 569 | struct flow_head *head = rtnl_dereference(tp->root); |
8113c095 | 570 | struct flow_filter *f = arg; |
e5dfb815 | 571 | |
70da9f0b | 572 | list_del_rcu(&f->list); |
22f7cec9 | 573 | tcf_exts_get_net(&f->exts); |
7afe8e4f | 574 | tcf_queue_work(&f->rwork, flow_destroy_filter_work); |
763dbf63 | 575 | *last = list_empty(&head->filters); |
e5dfb815 PM |
576 | return 0; |
577 | } | |
578 | ||
579 | static int flow_init(struct tcf_proto *tp) | |
580 | { | |
581 | struct flow_head *head; | |
582 | ||
e5dfb815 PM |
583 | head = kzalloc(sizeof(*head), GFP_KERNEL); |
584 | if (head == NULL) | |
585 | return -ENOBUFS; | |
586 | INIT_LIST_HEAD(&head->filters); | |
70da9f0b | 587 | rcu_assign_pointer(tp->root, head); |
e5dfb815 PM |
588 | return 0; |
589 | } | |
590 | ||
763dbf63 | 591 | static void flow_destroy(struct tcf_proto *tp) |
e5dfb815 | 592 | { |
70da9f0b | 593 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
594 | struct flow_filter *f, *next; |
595 | ||
596 | list_for_each_entry_safe(f, next, &head->filters, list) { | |
70da9f0b | 597 | list_del_rcu(&f->list); |
22f7cec9 | 598 | if (tcf_exts_get_net(&f->exts)) |
7afe8e4f | 599 | tcf_queue_work(&f->rwork, flow_destroy_filter_work); |
22f7cec9 CW |
600 | else |
601 | __flow_destroy_filter(f); | |
e5dfb815 | 602 | } |
70da9f0b | 603 | kfree_rcu(head, rcu); |
e5dfb815 PM |
604 | } |
605 | ||
8113c095 | 606 | static void *flow_get(struct tcf_proto *tp, u32 handle) |
e5dfb815 | 607 | { |
70da9f0b | 608 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
609 | struct flow_filter *f; |
610 | ||
6a659cd0 | 611 | list_for_each_entry(f, &head->filters, list) |
e5dfb815 | 612 | if (f->handle == handle) |
8113c095 WC |
613 | return f; |
614 | return NULL; | |
e5dfb815 PM |
615 | } |
616 | ||
8113c095 | 617 | static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh, |
e5dfb815 PM |
618 | struct sk_buff *skb, struct tcmsg *t) |
619 | { | |
8113c095 | 620 | struct flow_filter *f = fh; |
e5dfb815 PM |
621 | struct nlattr *nest; |
622 | ||
623 | if (f == NULL) | |
624 | return skb->len; | |
625 | ||
626 | t->tcm_handle = f->handle; | |
627 | ||
628 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
629 | if (nest == NULL) | |
630 | goto nla_put_failure; | |
631 | ||
1b34ec43 DM |
632 | if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) || |
633 | nla_put_u32(skb, TCA_FLOW_MODE, f->mode)) | |
634 | goto nla_put_failure; | |
e5dfb815 PM |
635 | |
636 | if (f->mask != ~0 || f->xor != 0) { | |
1b34ec43 DM |
637 | if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) || |
638 | nla_put_u32(skb, TCA_FLOW_XOR, f->xor)) | |
639 | goto nla_put_failure; | |
e5dfb815 | 640 | } |
1b34ec43 DM |
641 | if (f->rshift && |
642 | nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift)) | |
643 | goto nla_put_failure; | |
644 | if (f->addend && | |
645 | nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend)) | |
646 | goto nla_put_failure; | |
e5dfb815 | 647 | |
1b34ec43 DM |
648 | if (f->divisor && |
649 | nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor)) | |
650 | goto nla_put_failure; | |
651 | if (f->baseclass && | |
652 | nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass)) | |
653 | goto nla_put_failure; | |
e5dfb815 | 654 | |
1b34ec43 DM |
655 | if (f->perturb_period && |
656 | nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ)) | |
657 | goto nla_put_failure; | |
72d9794f | 658 | |
5da57f42 | 659 | if (tcf_exts_dump(skb, &f->exts) < 0) |
e5dfb815 | 660 | goto nla_put_failure; |
0aead543 | 661 | #ifdef CONFIG_NET_EMATCH |
e5dfb815 PM |
662 | if (f->ematches.hdr.nmatches && |
663 | tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0) | |
664 | goto nla_put_failure; | |
0aead543 | 665 | #endif |
e5dfb815 PM |
666 | nla_nest_end(skb, nest); |
667 | ||
5da57f42 | 668 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
e5dfb815 PM |
669 | goto nla_put_failure; |
670 | ||
671 | return skb->len; | |
672 | ||
673 | nla_put_failure: | |
6ea3b446 | 674 | nla_nest_cancel(skb, nest); |
e5dfb815 PM |
675 | return -1; |
676 | } | |
677 | ||
678 | static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
679 | { | |
70da9f0b | 680 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
681 | struct flow_filter *f; |
682 | ||
6a659cd0 | 683 | list_for_each_entry(f, &head->filters, list) { |
e5dfb815 PM |
684 | if (arg->count < arg->skip) |
685 | goto skip; | |
8113c095 | 686 | if (arg->fn(tp, f, arg) < 0) { |
e5dfb815 PM |
687 | arg->stop = 1; |
688 | break; | |
689 | } | |
690 | skip: | |
691 | arg->count++; | |
692 | } | |
693 | } | |
694 | ||
695 | static struct tcf_proto_ops cls_flow_ops __read_mostly = { | |
696 | .kind = "flow", | |
697 | .classify = flow_classify, | |
698 | .init = flow_init, | |
699 | .destroy = flow_destroy, | |
700 | .change = flow_change, | |
701 | .delete = flow_delete, | |
702 | .get = flow_get, | |
e5dfb815 PM |
703 | .dump = flow_dump, |
704 | .walk = flow_walk, | |
705 | .owner = THIS_MODULE, | |
706 | }; | |
707 | ||
708 | static int __init cls_flow_init(void) | |
709 | { | |
710 | return register_tcf_proto_ops(&cls_flow_ops); | |
711 | } | |
712 | ||
713 | static void __exit cls_flow_exit(void) | |
714 | { | |
715 | unregister_tcf_proto_ops(&cls_flow_ops); | |
716 | } | |
717 | ||
718 | module_init(cls_flow_init); | |
719 | module_exit(cls_flow_exit); | |
720 | ||
721 | MODULE_LICENSE("GPL"); | |
722 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
723 | MODULE_DESCRIPTION("TC flow classifier"); |