Commit | Line | Data |
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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> |
e5dfb815 PM |
25 | |
26 | #include <net/pkt_cls.h> | |
27 | #include <net/ip.h> | |
28 | #include <net/route.h> | |
6bd2a9af ED |
29 | #include <net/flow_keys.h> |
30 | ||
e5dfb815 PM |
31 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
32 | #include <net/netfilter/nf_conntrack.h> | |
33 | #endif | |
34 | ||
35 | struct flow_head { | |
36 | struct list_head filters; | |
70da9f0b | 37 | struct rcu_head rcu; |
e5dfb815 PM |
38 | }; |
39 | ||
40 | struct flow_filter { | |
41 | struct list_head list; | |
42 | struct tcf_exts exts; | |
43 | struct tcf_ematch_tree ematches; | |
70da9f0b | 44 | struct tcf_proto *tp; |
72d9794f PM |
45 | struct timer_list perturb_timer; |
46 | u32 perturb_period; | |
e5dfb815 PM |
47 | u32 handle; |
48 | ||
49 | u32 nkeys; | |
50 | u32 keymask; | |
51 | u32 mode; | |
52 | u32 mask; | |
53 | u32 xor; | |
54 | u32 rshift; | |
55 | u32 addend; | |
56 | u32 divisor; | |
57 | u32 baseclass; | |
72d9794f | 58 | u32 hashrnd; |
70da9f0b | 59 | struct rcu_head rcu; |
e5dfb815 PM |
60 | }; |
61 | ||
e5dfb815 PM |
62 | static inline u32 addr_fold(void *addr) |
63 | { | |
64 | unsigned long a = (unsigned long)addr; | |
65 | ||
66 | return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0); | |
67 | } | |
68 | ||
6bd2a9af | 69 | static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 70 | { |
6bd2a9af ED |
71 | if (flow->src) |
72 | return ntohl(flow->src); | |
4b95c3d4 | 73 | return addr_fold(skb->sk); |
e5dfb815 PM |
74 | } |
75 | ||
6bd2a9af | 76 | static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 77 | { |
6bd2a9af ED |
78 | if (flow->dst) |
79 | return ntohl(flow->dst); | |
d8b9605d | 80 | return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb); |
e5dfb815 PM |
81 | } |
82 | ||
6bd2a9af | 83 | static u32 flow_get_proto(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 84 | { |
6bd2a9af | 85 | return flow->ip_proto; |
e5dfb815 PM |
86 | } |
87 | ||
6bd2a9af | 88 | static u32 flow_get_proto_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 89 | { |
6bd2a9af ED |
90 | if (flow->ports) |
91 | return ntohs(flow->port16[0]); | |
e5dfb815 | 92 | |
859c2012 ED |
93 | return addr_fold(skb->sk); |
94 | } | |
95 | ||
6bd2a9af | 96 | static u32 flow_get_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
859c2012 | 97 | { |
6bd2a9af ED |
98 | if (flow->ports) |
99 | return ntohs(flow->port16[1]); | |
e5dfb815 | 100 | |
d8b9605d | 101 | return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb); |
e5dfb815 PM |
102 | } |
103 | ||
104 | static u32 flow_get_iif(const struct sk_buff *skb) | |
105 | { | |
8964be4a | 106 | return skb->skb_iif; |
e5dfb815 PM |
107 | } |
108 | ||
109 | static u32 flow_get_priority(const struct sk_buff *skb) | |
110 | { | |
111 | return skb->priority; | |
112 | } | |
113 | ||
114 | static u32 flow_get_mark(const struct sk_buff *skb) | |
115 | { | |
116 | return skb->mark; | |
117 | } | |
118 | ||
119 | static u32 flow_get_nfct(const struct sk_buff *skb) | |
120 | { | |
121 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
122 | return addr_fold(skb->nfct); | |
123 | #else | |
124 | return 0; | |
125 | #endif | |
126 | } | |
127 | ||
128 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
129 | #define CTTUPLE(skb, member) \ | |
130 | ({ \ | |
131 | enum ip_conntrack_info ctinfo; \ | |
859c2012 | 132 | const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \ |
e5dfb815 PM |
133 | if (ct == NULL) \ |
134 | goto fallback; \ | |
135 | ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \ | |
136 | }) | |
137 | #else | |
138 | #define CTTUPLE(skb, member) \ | |
139 | ({ \ | |
140 | goto fallback; \ | |
141 | 0; \ | |
142 | }) | |
143 | #endif | |
144 | ||
6bd2a9af | 145 | static u32 flow_get_nfct_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 146 | { |
d8b9605d | 147 | switch (tc_skb_protocol(skb)) { |
60678040 | 148 | case htons(ETH_P_IP): |
e5dfb815 | 149 | return ntohl(CTTUPLE(skb, src.u3.ip)); |
60678040 | 150 | case htons(ETH_P_IPV6): |
e5dfb815 PM |
151 | return ntohl(CTTUPLE(skb, src.u3.ip6[3])); |
152 | } | |
153 | fallback: | |
6bd2a9af | 154 | return flow_get_src(skb, flow); |
e5dfb815 PM |
155 | } |
156 | ||
6bd2a9af | 157 | static u32 flow_get_nfct_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 158 | { |
d8b9605d | 159 | switch (tc_skb_protocol(skb)) { |
60678040 | 160 | case htons(ETH_P_IP): |
e5dfb815 | 161 | return ntohl(CTTUPLE(skb, dst.u3.ip)); |
60678040 | 162 | case htons(ETH_P_IPV6): |
e5dfb815 PM |
163 | return ntohl(CTTUPLE(skb, dst.u3.ip6[3])); |
164 | } | |
165 | fallback: | |
6bd2a9af | 166 | return flow_get_dst(skb, flow); |
e5dfb815 PM |
167 | } |
168 | ||
6bd2a9af | 169 | static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 PM |
170 | { |
171 | return ntohs(CTTUPLE(skb, src.u.all)); | |
172 | fallback: | |
6bd2a9af | 173 | return flow_get_proto_src(skb, flow); |
e5dfb815 PM |
174 | } |
175 | ||
6bd2a9af | 176 | static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 PM |
177 | { |
178 | return ntohs(CTTUPLE(skb, dst.u.all)); | |
179 | fallback: | |
6bd2a9af | 180 | return flow_get_proto_dst(skb, flow); |
e5dfb815 PM |
181 | } |
182 | ||
183 | static u32 flow_get_rtclassid(const struct sk_buff *skb) | |
184 | { | |
c7066f70 | 185 | #ifdef CONFIG_IP_ROUTE_CLASSID |
adf30907 ED |
186 | if (skb_dst(skb)) |
187 | return skb_dst(skb)->tclassid; | |
e5dfb815 PM |
188 | #endif |
189 | return 0; | |
190 | } | |
191 | ||
192 | static u32 flow_get_skuid(const struct sk_buff *skb) | |
193 | { | |
a6c6796c EB |
194 | if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) { |
195 | kuid_t skuid = skb->sk->sk_socket->file->f_cred->fsuid; | |
196 | return from_kuid(&init_user_ns, skuid); | |
197 | } | |
e5dfb815 PM |
198 | return 0; |
199 | } | |
200 | ||
201 | static u32 flow_get_skgid(const struct sk_buff *skb) | |
202 | { | |
a6c6796c EB |
203 | if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) { |
204 | kgid_t skgid = skb->sk->sk_socket->file->f_cred->fsgid; | |
205 | return from_kgid(&init_user_ns, skgid); | |
206 | } | |
e5dfb815 PM |
207 | return 0; |
208 | } | |
209 | ||
9ec13810 PM |
210 | static u32 flow_get_vlan_tag(const struct sk_buff *skb) |
211 | { | |
212 | u16 uninitialized_var(tag); | |
213 | ||
214 | if (vlan_get_tag(skb, &tag) < 0) | |
215 | return 0; | |
216 | return tag & VLAN_VID_MASK; | |
217 | } | |
218 | ||
739a91ef CG |
219 | static u32 flow_get_rxhash(struct sk_buff *skb) |
220 | { | |
3958afa1 | 221 | return skb_get_hash(skb); |
739a91ef CG |
222 | } |
223 | ||
6bd2a9af | 224 | static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow) |
e5dfb815 PM |
225 | { |
226 | switch (key) { | |
227 | case FLOW_KEY_SRC: | |
6bd2a9af | 228 | return flow_get_src(skb, flow); |
e5dfb815 | 229 | case FLOW_KEY_DST: |
6bd2a9af | 230 | return flow_get_dst(skb, flow); |
e5dfb815 | 231 | case FLOW_KEY_PROTO: |
6bd2a9af | 232 | return flow_get_proto(skb, flow); |
e5dfb815 | 233 | case FLOW_KEY_PROTO_SRC: |
6bd2a9af | 234 | return flow_get_proto_src(skb, flow); |
e5dfb815 | 235 | case FLOW_KEY_PROTO_DST: |
6bd2a9af | 236 | return flow_get_proto_dst(skb, flow); |
e5dfb815 PM |
237 | case FLOW_KEY_IIF: |
238 | return flow_get_iif(skb); | |
239 | case FLOW_KEY_PRIORITY: | |
240 | return flow_get_priority(skb); | |
241 | case FLOW_KEY_MARK: | |
242 | return flow_get_mark(skb); | |
243 | case FLOW_KEY_NFCT: | |
244 | return flow_get_nfct(skb); | |
245 | case FLOW_KEY_NFCT_SRC: | |
6bd2a9af | 246 | return flow_get_nfct_src(skb, flow); |
e5dfb815 | 247 | case FLOW_KEY_NFCT_DST: |
6bd2a9af | 248 | return flow_get_nfct_dst(skb, flow); |
e5dfb815 | 249 | case FLOW_KEY_NFCT_PROTO_SRC: |
6bd2a9af | 250 | return flow_get_nfct_proto_src(skb, flow); |
e5dfb815 | 251 | case FLOW_KEY_NFCT_PROTO_DST: |
6bd2a9af | 252 | return flow_get_nfct_proto_dst(skb, flow); |
e5dfb815 PM |
253 | case FLOW_KEY_RTCLASSID: |
254 | return flow_get_rtclassid(skb); | |
255 | case FLOW_KEY_SKUID: | |
256 | return flow_get_skuid(skb); | |
257 | case FLOW_KEY_SKGID: | |
258 | return flow_get_skgid(skb); | |
9ec13810 PM |
259 | case FLOW_KEY_VLAN_TAG: |
260 | return flow_get_vlan_tag(skb); | |
739a91ef CG |
261 | case FLOW_KEY_RXHASH: |
262 | return flow_get_rxhash(skb); | |
e5dfb815 PM |
263 | default: |
264 | WARN_ON(1); | |
265 | return 0; | |
266 | } | |
267 | } | |
268 | ||
6bd2a9af ED |
269 | #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \ |
270 | (1 << FLOW_KEY_DST) | \ | |
271 | (1 << FLOW_KEY_PROTO) | \ | |
272 | (1 << FLOW_KEY_PROTO_SRC) | \ | |
273 | (1 << FLOW_KEY_PROTO_DST) | \ | |
274 | (1 << FLOW_KEY_NFCT_SRC) | \ | |
275 | (1 << FLOW_KEY_NFCT_DST) | \ | |
276 | (1 << FLOW_KEY_NFCT_PROTO_SRC) | \ | |
277 | (1 << FLOW_KEY_NFCT_PROTO_DST)) | |
278 | ||
dc7f9f6e | 279 | static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
e5dfb815 PM |
280 | struct tcf_result *res) |
281 | { | |
70da9f0b | 282 | struct flow_head *head = rcu_dereference_bh(tp->root); |
e5dfb815 PM |
283 | struct flow_filter *f; |
284 | u32 keymask; | |
285 | u32 classid; | |
286 | unsigned int n, key; | |
287 | int r; | |
288 | ||
70da9f0b | 289 | list_for_each_entry_rcu(f, &head->filters, list) { |
3a53943b | 290 | u32 keys[FLOW_KEY_MAX + 1]; |
6bd2a9af | 291 | struct flow_keys flow_keys; |
e5dfb815 PM |
292 | |
293 | if (!tcf_em_tree_match(skb, &f->ematches, NULL)) | |
294 | continue; | |
295 | ||
296 | keymask = f->keymask; | |
6bd2a9af ED |
297 | if (keymask & FLOW_KEYS_NEEDED) |
298 | skb_flow_dissect(skb, &flow_keys); | |
e5dfb815 PM |
299 | |
300 | for (n = 0; n < f->nkeys; n++) { | |
301 | key = ffs(keymask) - 1; | |
302 | keymask &= ~(1 << key); | |
6bd2a9af | 303 | keys[n] = flow_key_get(skb, key, &flow_keys); |
e5dfb815 PM |
304 | } |
305 | ||
306 | if (f->mode == FLOW_MODE_HASH) | |
72d9794f | 307 | classid = jhash2(keys, f->nkeys, f->hashrnd); |
e5dfb815 PM |
308 | else { |
309 | classid = keys[0]; | |
310 | classid = (classid & f->mask) ^ f->xor; | |
311 | classid = (classid >> f->rshift) + f->addend; | |
312 | } | |
313 | ||
314 | if (f->divisor) | |
315 | classid %= f->divisor; | |
316 | ||
317 | res->class = 0; | |
318 | res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid); | |
319 | ||
320 | r = tcf_exts_exec(skb, &f->exts, res); | |
321 | if (r < 0) | |
322 | continue; | |
323 | return r; | |
324 | } | |
325 | return -1; | |
326 | } | |
327 | ||
72d9794f PM |
328 | static void flow_perturbation(unsigned long arg) |
329 | { | |
330 | struct flow_filter *f = (struct flow_filter *)arg; | |
331 | ||
332 | get_random_bytes(&f->hashrnd, 4); | |
333 | if (f->perturb_period) | |
334 | mod_timer(&f->perturb_timer, jiffies + f->perturb_period); | |
335 | } | |
336 | ||
e5dfb815 PM |
337 | static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = { |
338 | [TCA_FLOW_KEYS] = { .type = NLA_U32 }, | |
339 | [TCA_FLOW_MODE] = { .type = NLA_U32 }, | |
340 | [TCA_FLOW_BASECLASS] = { .type = NLA_U32 }, | |
341 | [TCA_FLOW_RSHIFT] = { .type = NLA_U32 }, | |
342 | [TCA_FLOW_ADDEND] = { .type = NLA_U32 }, | |
343 | [TCA_FLOW_MASK] = { .type = NLA_U32 }, | |
344 | [TCA_FLOW_XOR] = { .type = NLA_U32 }, | |
345 | [TCA_FLOW_DIVISOR] = { .type = NLA_U32 }, | |
346 | [TCA_FLOW_ACT] = { .type = NLA_NESTED }, | |
347 | [TCA_FLOW_POLICE] = { .type = NLA_NESTED }, | |
348 | [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED }, | |
72d9794f | 349 | [TCA_FLOW_PERTURB] = { .type = NLA_U32 }, |
e5dfb815 PM |
350 | }; |
351 | ||
70da9f0b JF |
352 | static void flow_destroy_filter(struct rcu_head *head) |
353 | { | |
354 | struct flow_filter *f = container_of(head, struct flow_filter, rcu); | |
355 | ||
356 | del_timer_sync(&f->perturb_timer); | |
18d0264f | 357 | tcf_exts_destroy(&f->exts); |
82a470f1 | 358 | tcf_em_tree_destroy(&f->ematches); |
70da9f0b JF |
359 | kfree(f); |
360 | } | |
361 | ||
c1b52739 | 362 | static int flow_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 363 | struct tcf_proto *tp, unsigned long base, |
e5dfb815 | 364 | u32 handle, struct nlattr **tca, |
2f7ef2f8 | 365 | unsigned long *arg, bool ovr) |
e5dfb815 | 366 | { |
70da9f0b JF |
367 | struct flow_head *head = rtnl_dereference(tp->root); |
368 | struct flow_filter *fold, *fnew; | |
e5dfb815 PM |
369 | struct nlattr *opt = tca[TCA_OPTIONS]; |
370 | struct nlattr *tb[TCA_FLOW_MAX + 1]; | |
371 | struct tcf_exts e; | |
372 | struct tcf_ematch_tree t; | |
373 | unsigned int nkeys = 0; | |
72d9794f | 374 | unsigned int perturb_period = 0; |
e5dfb815 PM |
375 | u32 baseclass = 0; |
376 | u32 keymask = 0; | |
377 | u32 mode; | |
378 | int err; | |
379 | ||
380 | if (opt == NULL) | |
381 | return -EINVAL; | |
382 | ||
383 | err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy); | |
384 | if (err < 0) | |
385 | return err; | |
386 | ||
387 | if (tb[TCA_FLOW_BASECLASS]) { | |
388 | baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]); | |
389 | if (TC_H_MIN(baseclass) == 0) | |
390 | return -EINVAL; | |
391 | } | |
392 | ||
393 | if (tb[TCA_FLOW_KEYS]) { | |
394 | keymask = nla_get_u32(tb[TCA_FLOW_KEYS]); | |
e5dfb815 PM |
395 | |
396 | nkeys = hweight32(keymask); | |
397 | if (nkeys == 0) | |
398 | return -EINVAL; | |
4f250491 PM |
399 | |
400 | if (fls(keymask) - 1 > FLOW_KEY_MAX) | |
401 | return -EOPNOTSUPP; | |
a6c6796c EB |
402 | |
403 | if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) && | |
e32123e5 | 404 | sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns) |
a6c6796c | 405 | return -EOPNOTSUPP; |
e5dfb815 PM |
406 | } |
407 | ||
5da57f42 | 408 | tcf_exts_init(&e, TCA_FLOW_ACT, TCA_FLOW_POLICE); |
2f7ef2f8 | 409 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr); |
e5dfb815 PM |
410 | if (err < 0) |
411 | return err; | |
412 | ||
413 | err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t); | |
414 | if (err < 0) | |
415 | goto err1; | |
416 | ||
70da9f0b JF |
417 | err = -ENOBUFS; |
418 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); | |
419 | if (!fnew) | |
420 | goto err2; | |
421 | ||
422 | fold = (struct flow_filter *)*arg; | |
423 | if (fold) { | |
e5dfb815 | 424 | err = -EINVAL; |
70da9f0b | 425 | if (fold->handle != handle && handle) |
e5dfb815 PM |
426 | goto err2; |
427 | ||
70da9f0b | 428 | /* Copy fold into fnew */ |
70da9f0b | 429 | fnew->tp = fold->tp; |
70da9f0b JF |
430 | fnew->handle = fold->handle; |
431 | fnew->nkeys = fold->nkeys; | |
432 | fnew->keymask = fold->keymask; | |
433 | fnew->mode = fold->mode; | |
434 | fnew->mask = fold->mask; | |
435 | fnew->xor = fold->xor; | |
436 | fnew->rshift = fold->rshift; | |
437 | fnew->addend = fold->addend; | |
438 | fnew->divisor = fold->divisor; | |
439 | fnew->baseclass = fold->baseclass; | |
440 | fnew->hashrnd = fold->hashrnd; | |
441 | ||
442 | mode = fold->mode; | |
e5dfb815 PM |
443 | if (tb[TCA_FLOW_MODE]) |
444 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); | |
445 | if (mode != FLOW_MODE_HASH && nkeys > 1) | |
446 | goto err2; | |
72d9794f PM |
447 | |
448 | if (mode == FLOW_MODE_HASH) | |
70da9f0b | 449 | perturb_period = fold->perturb_period; |
72d9794f PM |
450 | if (tb[TCA_FLOW_PERTURB]) { |
451 | if (mode != FLOW_MODE_HASH) | |
452 | goto err2; | |
453 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; | |
454 | } | |
e5dfb815 PM |
455 | } else { |
456 | err = -EINVAL; | |
457 | if (!handle) | |
458 | goto err2; | |
459 | if (!tb[TCA_FLOW_KEYS]) | |
460 | goto err2; | |
461 | ||
462 | mode = FLOW_MODE_MAP; | |
463 | if (tb[TCA_FLOW_MODE]) | |
464 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); | |
465 | if (mode != FLOW_MODE_HASH && nkeys > 1) | |
466 | goto err2; | |
467 | ||
72d9794f PM |
468 | if (tb[TCA_FLOW_PERTURB]) { |
469 | if (mode != FLOW_MODE_HASH) | |
470 | goto err2; | |
471 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; | |
472 | } | |
473 | ||
e5dfb815 PM |
474 | if (TC_H_MAJ(baseclass) == 0) |
475 | baseclass = TC_H_MAKE(tp->q->handle, baseclass); | |
476 | if (TC_H_MIN(baseclass) == 0) | |
477 | baseclass = TC_H_MAKE(baseclass, 1); | |
478 | ||
70da9f0b JF |
479 | fnew->handle = handle; |
480 | fnew->mask = ~0U; | |
481 | fnew->tp = tp; | |
482 | get_random_bytes(&fnew->hashrnd, 4); | |
483 | tcf_exts_init(&fnew->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE); | |
e5dfb815 PM |
484 | } |
485 | ||
70da9f0b JF |
486 | fnew->perturb_timer.function = flow_perturbation; |
487 | fnew->perturb_timer.data = (unsigned long)fnew; | |
488 | init_timer_deferrable(&fnew->perturb_timer); | |
e5dfb815 | 489 | |
70da9f0b JF |
490 | tcf_exts_change(tp, &fnew->exts, &e); |
491 | tcf_em_tree_change(tp, &fnew->ematches, &t); | |
e5dfb815 | 492 | |
02875878 ED |
493 | netif_keep_dst(qdisc_dev(tp->q)); |
494 | ||
e5dfb815 | 495 | if (tb[TCA_FLOW_KEYS]) { |
70da9f0b JF |
496 | fnew->keymask = keymask; |
497 | fnew->nkeys = nkeys; | |
e5dfb815 PM |
498 | } |
499 | ||
70da9f0b | 500 | fnew->mode = mode; |
e5dfb815 PM |
501 | |
502 | if (tb[TCA_FLOW_MASK]) | |
70da9f0b | 503 | fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]); |
e5dfb815 | 504 | if (tb[TCA_FLOW_XOR]) |
70da9f0b | 505 | fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]); |
e5dfb815 | 506 | if (tb[TCA_FLOW_RSHIFT]) |
70da9f0b | 507 | fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]); |
e5dfb815 | 508 | if (tb[TCA_FLOW_ADDEND]) |
70da9f0b | 509 | fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]); |
e5dfb815 PM |
510 | |
511 | if (tb[TCA_FLOW_DIVISOR]) | |
70da9f0b | 512 | fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]); |
e5dfb815 | 513 | if (baseclass) |
70da9f0b | 514 | fnew->baseclass = baseclass; |
e5dfb815 | 515 | |
70da9f0b | 516 | fnew->perturb_period = perturb_period; |
72d9794f | 517 | if (perturb_period) |
70da9f0b | 518 | mod_timer(&fnew->perturb_timer, jiffies + perturb_period); |
72d9794f | 519 | |
e5dfb815 | 520 | if (*arg == 0) |
70da9f0b JF |
521 | list_add_tail_rcu(&fnew->list, &head->filters); |
522 | else | |
523 | list_replace_rcu(&fnew->list, &fold->list); | |
e5dfb815 | 524 | |
70da9f0b | 525 | *arg = (unsigned long)fnew; |
e5dfb815 | 526 | |
70da9f0b JF |
527 | if (fold) |
528 | call_rcu(&fold->rcu, flow_destroy_filter); | |
e5dfb815 PM |
529 | return 0; |
530 | ||
531 | err2: | |
82a470f1 | 532 | tcf_em_tree_destroy(&t); |
70da9f0b | 533 | kfree(fnew); |
e5dfb815 | 534 | err1: |
18d0264f | 535 | tcf_exts_destroy(&e); |
e5dfb815 PM |
536 | return err; |
537 | } | |
538 | ||
e5dfb815 PM |
539 | static int flow_delete(struct tcf_proto *tp, unsigned long arg) |
540 | { | |
541 | struct flow_filter *f = (struct flow_filter *)arg; | |
542 | ||
70da9f0b JF |
543 | list_del_rcu(&f->list); |
544 | call_rcu(&f->rcu, flow_destroy_filter); | |
e5dfb815 PM |
545 | return 0; |
546 | } | |
547 | ||
548 | static int flow_init(struct tcf_proto *tp) | |
549 | { | |
550 | struct flow_head *head; | |
551 | ||
e5dfb815 PM |
552 | head = kzalloc(sizeof(*head), GFP_KERNEL); |
553 | if (head == NULL) | |
554 | return -ENOBUFS; | |
555 | INIT_LIST_HEAD(&head->filters); | |
70da9f0b | 556 | rcu_assign_pointer(tp->root, head); |
e5dfb815 PM |
557 | return 0; |
558 | } | |
559 | ||
1e052be6 | 560 | static bool flow_destroy(struct tcf_proto *tp, bool force) |
e5dfb815 | 561 | { |
70da9f0b | 562 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
563 | struct flow_filter *f, *next; |
564 | ||
1e052be6 CW |
565 | if (!force && !list_empty(&head->filters)) |
566 | return false; | |
567 | ||
e5dfb815 | 568 | list_for_each_entry_safe(f, next, &head->filters, list) { |
70da9f0b JF |
569 | list_del_rcu(&f->list); |
570 | call_rcu(&f->rcu, flow_destroy_filter); | |
e5dfb815 | 571 | } |
70da9f0b JF |
572 | RCU_INIT_POINTER(tp->root, NULL); |
573 | kfree_rcu(head, rcu); | |
1e052be6 | 574 | return true; |
e5dfb815 PM |
575 | } |
576 | ||
577 | static unsigned long flow_get(struct tcf_proto *tp, u32 handle) | |
578 | { | |
70da9f0b | 579 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
580 | struct flow_filter *f; |
581 | ||
6a659cd0 | 582 | list_for_each_entry(f, &head->filters, list) |
e5dfb815 PM |
583 | if (f->handle == handle) |
584 | return (unsigned long)f; | |
585 | return 0; | |
586 | } | |
587 | ||
832d1d5b | 588 | static int flow_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
e5dfb815 PM |
589 | struct sk_buff *skb, struct tcmsg *t) |
590 | { | |
591 | struct flow_filter *f = (struct flow_filter *)fh; | |
592 | struct nlattr *nest; | |
593 | ||
594 | if (f == NULL) | |
595 | return skb->len; | |
596 | ||
597 | t->tcm_handle = f->handle; | |
598 | ||
599 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
600 | if (nest == NULL) | |
601 | goto nla_put_failure; | |
602 | ||
1b34ec43 DM |
603 | if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) || |
604 | nla_put_u32(skb, TCA_FLOW_MODE, f->mode)) | |
605 | goto nla_put_failure; | |
e5dfb815 PM |
606 | |
607 | if (f->mask != ~0 || f->xor != 0) { | |
1b34ec43 DM |
608 | if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) || |
609 | nla_put_u32(skb, TCA_FLOW_XOR, f->xor)) | |
610 | goto nla_put_failure; | |
e5dfb815 | 611 | } |
1b34ec43 DM |
612 | if (f->rshift && |
613 | nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift)) | |
614 | goto nla_put_failure; | |
615 | if (f->addend && | |
616 | nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend)) | |
617 | goto nla_put_failure; | |
e5dfb815 | 618 | |
1b34ec43 DM |
619 | if (f->divisor && |
620 | nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor)) | |
621 | goto nla_put_failure; | |
622 | if (f->baseclass && | |
623 | nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass)) | |
624 | goto nla_put_failure; | |
e5dfb815 | 625 | |
1b34ec43 DM |
626 | if (f->perturb_period && |
627 | nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ)) | |
628 | goto nla_put_failure; | |
72d9794f | 629 | |
5da57f42 | 630 | if (tcf_exts_dump(skb, &f->exts) < 0) |
e5dfb815 | 631 | goto nla_put_failure; |
0aead543 | 632 | #ifdef CONFIG_NET_EMATCH |
e5dfb815 PM |
633 | if (f->ematches.hdr.nmatches && |
634 | tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0) | |
635 | goto nla_put_failure; | |
0aead543 | 636 | #endif |
e5dfb815 PM |
637 | nla_nest_end(skb, nest); |
638 | ||
5da57f42 | 639 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
e5dfb815 PM |
640 | goto nla_put_failure; |
641 | ||
642 | return skb->len; | |
643 | ||
644 | nla_put_failure: | |
6ea3b446 | 645 | nla_nest_cancel(skb, nest); |
e5dfb815 PM |
646 | return -1; |
647 | } | |
648 | ||
649 | static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
650 | { | |
70da9f0b | 651 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
652 | struct flow_filter *f; |
653 | ||
6a659cd0 | 654 | list_for_each_entry(f, &head->filters, list) { |
e5dfb815 PM |
655 | if (arg->count < arg->skip) |
656 | goto skip; | |
657 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
658 | arg->stop = 1; | |
659 | break; | |
660 | } | |
661 | skip: | |
662 | arg->count++; | |
663 | } | |
664 | } | |
665 | ||
666 | static struct tcf_proto_ops cls_flow_ops __read_mostly = { | |
667 | .kind = "flow", | |
668 | .classify = flow_classify, | |
669 | .init = flow_init, | |
670 | .destroy = flow_destroy, | |
671 | .change = flow_change, | |
672 | .delete = flow_delete, | |
673 | .get = flow_get, | |
e5dfb815 PM |
674 | .dump = flow_dump, |
675 | .walk = flow_walk, | |
676 | .owner = THIS_MODULE, | |
677 | }; | |
678 | ||
679 | static int __init cls_flow_init(void) | |
680 | { | |
681 | return register_tcf_proto_ops(&cls_flow_ops); | |
682 | } | |
683 | ||
684 | static void __exit cls_flow_exit(void) | |
685 | { | |
686 | unregister_tcf_proto_ops(&cls_flow_ops); | |
687 | } | |
688 | ||
689 | module_init(cls_flow_init); | |
690 | module_exit(cls_flow_exit); | |
691 | ||
692 | MODULE_LICENSE("GPL"); | |
693 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
694 | MODULE_DESCRIPTION("TC flow classifier"); |