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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; | |
37 | }; | |
38 | ||
39 | struct flow_filter { | |
40 | struct list_head list; | |
41 | struct tcf_exts exts; | |
42 | struct tcf_ematch_tree ematches; | |
72d9794f PM |
43 | struct timer_list perturb_timer; |
44 | u32 perturb_period; | |
e5dfb815 PM |
45 | u32 handle; |
46 | ||
47 | u32 nkeys; | |
48 | u32 keymask; | |
49 | u32 mode; | |
50 | u32 mask; | |
51 | u32 xor; | |
52 | u32 rshift; | |
53 | u32 addend; | |
54 | u32 divisor; | |
55 | u32 baseclass; | |
72d9794f | 56 | u32 hashrnd; |
e5dfb815 PM |
57 | }; |
58 | ||
e5dfb815 PM |
59 | static const struct tcf_ext_map flow_ext_map = { |
60 | .action = TCA_FLOW_ACT, | |
61 | .police = TCA_FLOW_POLICE, | |
62 | }; | |
63 | ||
64 | static inline u32 addr_fold(void *addr) | |
65 | { | |
66 | unsigned long a = (unsigned long)addr; | |
67 | ||
68 | return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0); | |
69 | } | |
70 | ||
6bd2a9af | 71 | static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 72 | { |
6bd2a9af ED |
73 | if (flow->src) |
74 | return ntohl(flow->src); | |
4b95c3d4 | 75 | return addr_fold(skb->sk); |
e5dfb815 PM |
76 | } |
77 | ||
6bd2a9af | 78 | static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 79 | { |
6bd2a9af ED |
80 | if (flow->dst) |
81 | return ntohl(flow->dst); | |
4b95c3d4 | 82 | return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol; |
e5dfb815 PM |
83 | } |
84 | ||
6bd2a9af | 85 | static u32 flow_get_proto(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 86 | { |
6bd2a9af | 87 | return flow->ip_proto; |
e5dfb815 PM |
88 | } |
89 | ||
6bd2a9af | 90 | static u32 flow_get_proto_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 91 | { |
6bd2a9af ED |
92 | if (flow->ports) |
93 | return ntohs(flow->port16[0]); | |
e5dfb815 | 94 | |
859c2012 ED |
95 | return addr_fold(skb->sk); |
96 | } | |
97 | ||
6bd2a9af | 98 | static u32 flow_get_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
859c2012 | 99 | { |
6bd2a9af ED |
100 | if (flow->ports) |
101 | return ntohs(flow->port16[1]); | |
e5dfb815 | 102 | |
4b95c3d4 | 103 | return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol; |
e5dfb815 PM |
104 | } |
105 | ||
106 | static u32 flow_get_iif(const struct sk_buff *skb) | |
107 | { | |
8964be4a | 108 | return skb->skb_iif; |
e5dfb815 PM |
109 | } |
110 | ||
111 | static u32 flow_get_priority(const struct sk_buff *skb) | |
112 | { | |
113 | return skb->priority; | |
114 | } | |
115 | ||
116 | static u32 flow_get_mark(const struct sk_buff *skb) | |
117 | { | |
118 | return skb->mark; | |
119 | } | |
120 | ||
121 | static u32 flow_get_nfct(const struct sk_buff *skb) | |
122 | { | |
123 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
124 | return addr_fold(skb->nfct); | |
125 | #else | |
126 | return 0; | |
127 | #endif | |
128 | } | |
129 | ||
130 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
131 | #define CTTUPLE(skb, member) \ | |
132 | ({ \ | |
133 | enum ip_conntrack_info ctinfo; \ | |
859c2012 | 134 | const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \ |
e5dfb815 PM |
135 | if (ct == NULL) \ |
136 | goto fallback; \ | |
137 | ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \ | |
138 | }) | |
139 | #else | |
140 | #define CTTUPLE(skb, member) \ | |
141 | ({ \ | |
142 | goto fallback; \ | |
143 | 0; \ | |
144 | }) | |
145 | #endif | |
146 | ||
6bd2a9af | 147 | static u32 flow_get_nfct_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 PM |
148 | { |
149 | switch (skb->protocol) { | |
60678040 | 150 | case htons(ETH_P_IP): |
e5dfb815 | 151 | return ntohl(CTTUPLE(skb, src.u3.ip)); |
60678040 | 152 | case htons(ETH_P_IPV6): |
e5dfb815 PM |
153 | return ntohl(CTTUPLE(skb, src.u3.ip6[3])); |
154 | } | |
155 | fallback: | |
6bd2a9af | 156 | return flow_get_src(skb, flow); |
e5dfb815 PM |
157 | } |
158 | ||
6bd2a9af | 159 | static u32 flow_get_nfct_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 PM |
160 | { |
161 | switch (skb->protocol) { | |
60678040 | 162 | case htons(ETH_P_IP): |
e5dfb815 | 163 | return ntohl(CTTUPLE(skb, dst.u3.ip)); |
60678040 | 164 | case htons(ETH_P_IPV6): |
e5dfb815 PM |
165 | return ntohl(CTTUPLE(skb, dst.u3.ip6[3])); |
166 | } | |
167 | fallback: | |
6bd2a9af | 168 | return flow_get_dst(skb, flow); |
e5dfb815 PM |
169 | } |
170 | ||
6bd2a9af | 171 | static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 PM |
172 | { |
173 | return ntohs(CTTUPLE(skb, src.u.all)); | |
174 | fallback: | |
6bd2a9af | 175 | return flow_get_proto_src(skb, flow); |
e5dfb815 PM |
176 | } |
177 | ||
6bd2a9af | 178 | static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 PM |
179 | { |
180 | return ntohs(CTTUPLE(skb, dst.u.all)); | |
181 | fallback: | |
6bd2a9af | 182 | return flow_get_proto_dst(skb, flow); |
e5dfb815 PM |
183 | } |
184 | ||
185 | static u32 flow_get_rtclassid(const struct sk_buff *skb) | |
186 | { | |
c7066f70 | 187 | #ifdef CONFIG_IP_ROUTE_CLASSID |
adf30907 ED |
188 | if (skb_dst(skb)) |
189 | return skb_dst(skb)->tclassid; | |
e5dfb815 PM |
190 | #endif |
191 | return 0; | |
192 | } | |
193 | ||
194 | static u32 flow_get_skuid(const struct sk_buff *skb) | |
195 | { | |
196 | if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) | |
d76b0d9b | 197 | return skb->sk->sk_socket->file->f_cred->fsuid; |
e5dfb815 PM |
198 | return 0; |
199 | } | |
200 | ||
201 | static u32 flow_get_skgid(const struct sk_buff *skb) | |
202 | { | |
203 | if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) | |
d76b0d9b | 204 | return skb->sk->sk_socket->file->f_cred->fsgid; |
e5dfb815 PM |
205 | return 0; |
206 | } | |
207 | ||
9ec13810 PM |
208 | static u32 flow_get_vlan_tag(const struct sk_buff *skb) |
209 | { | |
210 | u16 uninitialized_var(tag); | |
211 | ||
212 | if (vlan_get_tag(skb, &tag) < 0) | |
213 | return 0; | |
214 | return tag & VLAN_VID_MASK; | |
215 | } | |
216 | ||
739a91ef CG |
217 | static u32 flow_get_rxhash(struct sk_buff *skb) |
218 | { | |
219 | return skb_get_rxhash(skb); | |
220 | } | |
221 | ||
6bd2a9af | 222 | static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow) |
e5dfb815 PM |
223 | { |
224 | switch (key) { | |
225 | case FLOW_KEY_SRC: | |
6bd2a9af | 226 | return flow_get_src(skb, flow); |
e5dfb815 | 227 | case FLOW_KEY_DST: |
6bd2a9af | 228 | return flow_get_dst(skb, flow); |
e5dfb815 | 229 | case FLOW_KEY_PROTO: |
6bd2a9af | 230 | return flow_get_proto(skb, flow); |
e5dfb815 | 231 | case FLOW_KEY_PROTO_SRC: |
6bd2a9af | 232 | return flow_get_proto_src(skb, flow); |
e5dfb815 | 233 | case FLOW_KEY_PROTO_DST: |
6bd2a9af | 234 | return flow_get_proto_dst(skb, flow); |
e5dfb815 PM |
235 | case FLOW_KEY_IIF: |
236 | return flow_get_iif(skb); | |
237 | case FLOW_KEY_PRIORITY: | |
238 | return flow_get_priority(skb); | |
239 | case FLOW_KEY_MARK: | |
240 | return flow_get_mark(skb); | |
241 | case FLOW_KEY_NFCT: | |
242 | return flow_get_nfct(skb); | |
243 | case FLOW_KEY_NFCT_SRC: | |
6bd2a9af | 244 | return flow_get_nfct_src(skb, flow); |
e5dfb815 | 245 | case FLOW_KEY_NFCT_DST: |
6bd2a9af | 246 | return flow_get_nfct_dst(skb, flow); |
e5dfb815 | 247 | case FLOW_KEY_NFCT_PROTO_SRC: |
6bd2a9af | 248 | return flow_get_nfct_proto_src(skb, flow); |
e5dfb815 | 249 | case FLOW_KEY_NFCT_PROTO_DST: |
6bd2a9af | 250 | return flow_get_nfct_proto_dst(skb, flow); |
e5dfb815 PM |
251 | case FLOW_KEY_RTCLASSID: |
252 | return flow_get_rtclassid(skb); | |
253 | case FLOW_KEY_SKUID: | |
254 | return flow_get_skuid(skb); | |
255 | case FLOW_KEY_SKGID: | |
256 | return flow_get_skgid(skb); | |
9ec13810 PM |
257 | case FLOW_KEY_VLAN_TAG: |
258 | return flow_get_vlan_tag(skb); | |
739a91ef CG |
259 | case FLOW_KEY_RXHASH: |
260 | return flow_get_rxhash(skb); | |
e5dfb815 PM |
261 | default: |
262 | WARN_ON(1); | |
263 | return 0; | |
264 | } | |
265 | } | |
266 | ||
6bd2a9af ED |
267 | #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \ |
268 | (1 << FLOW_KEY_DST) | \ | |
269 | (1 << FLOW_KEY_PROTO) | \ | |
270 | (1 << FLOW_KEY_PROTO_SRC) | \ | |
271 | (1 << FLOW_KEY_PROTO_DST) | \ | |
272 | (1 << FLOW_KEY_NFCT_SRC) | \ | |
273 | (1 << FLOW_KEY_NFCT_DST) | \ | |
274 | (1 << FLOW_KEY_NFCT_PROTO_SRC) | \ | |
275 | (1 << FLOW_KEY_NFCT_PROTO_DST)) | |
276 | ||
dc7f9f6e | 277 | static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
e5dfb815 PM |
278 | struct tcf_result *res) |
279 | { | |
280 | struct flow_head *head = tp->root; | |
281 | struct flow_filter *f; | |
282 | u32 keymask; | |
283 | u32 classid; | |
284 | unsigned int n, key; | |
285 | int r; | |
286 | ||
287 | list_for_each_entry(f, &head->filters, list) { | |
3a53943b | 288 | u32 keys[FLOW_KEY_MAX + 1]; |
6bd2a9af | 289 | struct flow_keys flow_keys; |
e5dfb815 PM |
290 | |
291 | if (!tcf_em_tree_match(skb, &f->ematches, NULL)) | |
292 | continue; | |
293 | ||
294 | keymask = f->keymask; | |
6bd2a9af ED |
295 | if (keymask & FLOW_KEYS_NEEDED) |
296 | skb_flow_dissect(skb, &flow_keys); | |
e5dfb815 PM |
297 | |
298 | for (n = 0; n < f->nkeys; n++) { | |
299 | key = ffs(keymask) - 1; | |
300 | keymask &= ~(1 << key); | |
6bd2a9af | 301 | keys[n] = flow_key_get(skb, key, &flow_keys); |
e5dfb815 PM |
302 | } |
303 | ||
304 | if (f->mode == FLOW_MODE_HASH) | |
72d9794f | 305 | classid = jhash2(keys, f->nkeys, f->hashrnd); |
e5dfb815 PM |
306 | else { |
307 | classid = keys[0]; | |
308 | classid = (classid & f->mask) ^ f->xor; | |
309 | classid = (classid >> f->rshift) + f->addend; | |
310 | } | |
311 | ||
312 | if (f->divisor) | |
313 | classid %= f->divisor; | |
314 | ||
315 | res->class = 0; | |
316 | res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid); | |
317 | ||
318 | r = tcf_exts_exec(skb, &f->exts, res); | |
319 | if (r < 0) | |
320 | continue; | |
321 | return r; | |
322 | } | |
323 | return -1; | |
324 | } | |
325 | ||
72d9794f PM |
326 | static void flow_perturbation(unsigned long arg) |
327 | { | |
328 | struct flow_filter *f = (struct flow_filter *)arg; | |
329 | ||
330 | get_random_bytes(&f->hashrnd, 4); | |
331 | if (f->perturb_period) | |
332 | mod_timer(&f->perturb_timer, jiffies + f->perturb_period); | |
333 | } | |
334 | ||
e5dfb815 PM |
335 | static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = { |
336 | [TCA_FLOW_KEYS] = { .type = NLA_U32 }, | |
337 | [TCA_FLOW_MODE] = { .type = NLA_U32 }, | |
338 | [TCA_FLOW_BASECLASS] = { .type = NLA_U32 }, | |
339 | [TCA_FLOW_RSHIFT] = { .type = NLA_U32 }, | |
340 | [TCA_FLOW_ADDEND] = { .type = NLA_U32 }, | |
341 | [TCA_FLOW_MASK] = { .type = NLA_U32 }, | |
342 | [TCA_FLOW_XOR] = { .type = NLA_U32 }, | |
343 | [TCA_FLOW_DIVISOR] = { .type = NLA_U32 }, | |
344 | [TCA_FLOW_ACT] = { .type = NLA_NESTED }, | |
345 | [TCA_FLOW_POLICE] = { .type = NLA_NESTED }, | |
346 | [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED }, | |
72d9794f | 347 | [TCA_FLOW_PERTURB] = { .type = NLA_U32 }, |
e5dfb815 PM |
348 | }; |
349 | ||
350 | static int flow_change(struct tcf_proto *tp, unsigned long base, | |
351 | u32 handle, struct nlattr **tca, | |
352 | unsigned long *arg) | |
353 | { | |
354 | struct flow_head *head = tp->root; | |
355 | struct flow_filter *f; | |
356 | struct nlattr *opt = tca[TCA_OPTIONS]; | |
357 | struct nlattr *tb[TCA_FLOW_MAX + 1]; | |
358 | struct tcf_exts e; | |
359 | struct tcf_ematch_tree t; | |
360 | unsigned int nkeys = 0; | |
72d9794f | 361 | unsigned int perturb_period = 0; |
e5dfb815 PM |
362 | u32 baseclass = 0; |
363 | u32 keymask = 0; | |
364 | u32 mode; | |
365 | int err; | |
366 | ||
367 | if (opt == NULL) | |
368 | return -EINVAL; | |
369 | ||
370 | err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy); | |
371 | if (err < 0) | |
372 | return err; | |
373 | ||
374 | if (tb[TCA_FLOW_BASECLASS]) { | |
375 | baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]); | |
376 | if (TC_H_MIN(baseclass) == 0) | |
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | if (tb[TCA_FLOW_KEYS]) { | |
381 | keymask = nla_get_u32(tb[TCA_FLOW_KEYS]); | |
e5dfb815 PM |
382 | |
383 | nkeys = hweight32(keymask); | |
384 | if (nkeys == 0) | |
385 | return -EINVAL; | |
4f250491 PM |
386 | |
387 | if (fls(keymask) - 1 > FLOW_KEY_MAX) | |
388 | return -EOPNOTSUPP; | |
e5dfb815 PM |
389 | } |
390 | ||
391 | err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &flow_ext_map); | |
392 | if (err < 0) | |
393 | return err; | |
394 | ||
395 | err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t); | |
396 | if (err < 0) | |
397 | goto err1; | |
398 | ||
399 | f = (struct flow_filter *)*arg; | |
400 | if (f != NULL) { | |
401 | err = -EINVAL; | |
402 | if (f->handle != handle && handle) | |
403 | goto err2; | |
404 | ||
405 | mode = f->mode; | |
406 | if (tb[TCA_FLOW_MODE]) | |
407 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); | |
408 | if (mode != FLOW_MODE_HASH && nkeys > 1) | |
409 | goto err2; | |
72d9794f PM |
410 | |
411 | if (mode == FLOW_MODE_HASH) | |
412 | perturb_period = f->perturb_period; | |
413 | if (tb[TCA_FLOW_PERTURB]) { | |
414 | if (mode != FLOW_MODE_HASH) | |
415 | goto err2; | |
416 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; | |
417 | } | |
e5dfb815 PM |
418 | } else { |
419 | err = -EINVAL; | |
420 | if (!handle) | |
421 | goto err2; | |
422 | if (!tb[TCA_FLOW_KEYS]) | |
423 | goto err2; | |
424 | ||
425 | mode = FLOW_MODE_MAP; | |
426 | if (tb[TCA_FLOW_MODE]) | |
427 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); | |
428 | if (mode != FLOW_MODE_HASH && nkeys > 1) | |
429 | goto err2; | |
430 | ||
72d9794f PM |
431 | if (tb[TCA_FLOW_PERTURB]) { |
432 | if (mode != FLOW_MODE_HASH) | |
433 | goto err2; | |
434 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; | |
435 | } | |
436 | ||
e5dfb815 PM |
437 | if (TC_H_MAJ(baseclass) == 0) |
438 | baseclass = TC_H_MAKE(tp->q->handle, baseclass); | |
439 | if (TC_H_MIN(baseclass) == 0) | |
440 | baseclass = TC_H_MAKE(baseclass, 1); | |
441 | ||
442 | err = -ENOBUFS; | |
443 | f = kzalloc(sizeof(*f), GFP_KERNEL); | |
444 | if (f == NULL) | |
445 | goto err2; | |
446 | ||
447 | f->handle = handle; | |
448 | f->mask = ~0U; | |
72d9794f PM |
449 | |
450 | get_random_bytes(&f->hashrnd, 4); | |
451 | f->perturb_timer.function = flow_perturbation; | |
452 | f->perturb_timer.data = (unsigned long)f; | |
453 | init_timer_deferrable(&f->perturb_timer); | |
e5dfb815 PM |
454 | } |
455 | ||
456 | tcf_exts_change(tp, &f->exts, &e); | |
457 | tcf_em_tree_change(tp, &f->ematches, &t); | |
458 | ||
459 | tcf_tree_lock(tp); | |
460 | ||
461 | if (tb[TCA_FLOW_KEYS]) { | |
462 | f->keymask = keymask; | |
463 | f->nkeys = nkeys; | |
464 | } | |
465 | ||
466 | f->mode = mode; | |
467 | ||
468 | if (tb[TCA_FLOW_MASK]) | |
469 | f->mask = nla_get_u32(tb[TCA_FLOW_MASK]); | |
470 | if (tb[TCA_FLOW_XOR]) | |
471 | f->xor = nla_get_u32(tb[TCA_FLOW_XOR]); | |
472 | if (tb[TCA_FLOW_RSHIFT]) | |
473 | f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]); | |
474 | if (tb[TCA_FLOW_ADDEND]) | |
475 | f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]); | |
476 | ||
477 | if (tb[TCA_FLOW_DIVISOR]) | |
478 | f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]); | |
479 | if (baseclass) | |
480 | f->baseclass = baseclass; | |
481 | ||
72d9794f PM |
482 | f->perturb_period = perturb_period; |
483 | del_timer(&f->perturb_timer); | |
484 | if (perturb_period) | |
485 | mod_timer(&f->perturb_timer, jiffies + perturb_period); | |
486 | ||
e5dfb815 PM |
487 | if (*arg == 0) |
488 | list_add_tail(&f->list, &head->filters); | |
489 | ||
490 | tcf_tree_unlock(tp); | |
491 | ||
492 | *arg = (unsigned long)f; | |
493 | return 0; | |
494 | ||
495 | err2: | |
496 | tcf_em_tree_destroy(tp, &t); | |
497 | err1: | |
498 | tcf_exts_destroy(tp, &e); | |
499 | return err; | |
500 | } | |
501 | ||
502 | static void flow_destroy_filter(struct tcf_proto *tp, struct flow_filter *f) | |
503 | { | |
72d9794f | 504 | del_timer_sync(&f->perturb_timer); |
e5dfb815 PM |
505 | tcf_exts_destroy(tp, &f->exts); |
506 | tcf_em_tree_destroy(tp, &f->ematches); | |
507 | kfree(f); | |
508 | } | |
509 | ||
510 | static int flow_delete(struct tcf_proto *tp, unsigned long arg) | |
511 | { | |
512 | struct flow_filter *f = (struct flow_filter *)arg; | |
513 | ||
514 | tcf_tree_lock(tp); | |
515 | list_del(&f->list); | |
516 | tcf_tree_unlock(tp); | |
517 | flow_destroy_filter(tp, f); | |
518 | return 0; | |
519 | } | |
520 | ||
521 | static int flow_init(struct tcf_proto *tp) | |
522 | { | |
523 | struct flow_head *head; | |
524 | ||
e5dfb815 PM |
525 | head = kzalloc(sizeof(*head), GFP_KERNEL); |
526 | if (head == NULL) | |
527 | return -ENOBUFS; | |
528 | INIT_LIST_HEAD(&head->filters); | |
529 | tp->root = head; | |
530 | return 0; | |
531 | } | |
532 | ||
533 | static void flow_destroy(struct tcf_proto *tp) | |
534 | { | |
535 | struct flow_head *head = tp->root; | |
536 | struct flow_filter *f, *next; | |
537 | ||
538 | list_for_each_entry_safe(f, next, &head->filters, list) { | |
539 | list_del(&f->list); | |
540 | flow_destroy_filter(tp, f); | |
541 | } | |
542 | kfree(head); | |
543 | } | |
544 | ||
545 | static unsigned long flow_get(struct tcf_proto *tp, u32 handle) | |
546 | { | |
547 | struct flow_head *head = tp->root; | |
548 | struct flow_filter *f; | |
549 | ||
550 | list_for_each_entry(f, &head->filters, list) | |
551 | if (f->handle == handle) | |
552 | return (unsigned long)f; | |
553 | return 0; | |
554 | } | |
555 | ||
556 | static void flow_put(struct tcf_proto *tp, unsigned long f) | |
557 | { | |
e5dfb815 PM |
558 | } |
559 | ||
560 | static int flow_dump(struct tcf_proto *tp, unsigned long fh, | |
561 | struct sk_buff *skb, struct tcmsg *t) | |
562 | { | |
563 | struct flow_filter *f = (struct flow_filter *)fh; | |
564 | struct nlattr *nest; | |
565 | ||
566 | if (f == NULL) | |
567 | return skb->len; | |
568 | ||
569 | t->tcm_handle = f->handle; | |
570 | ||
571 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
572 | if (nest == NULL) | |
573 | goto nla_put_failure; | |
574 | ||
1b34ec43 DM |
575 | if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) || |
576 | nla_put_u32(skb, TCA_FLOW_MODE, f->mode)) | |
577 | goto nla_put_failure; | |
e5dfb815 PM |
578 | |
579 | if (f->mask != ~0 || f->xor != 0) { | |
1b34ec43 DM |
580 | if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) || |
581 | nla_put_u32(skb, TCA_FLOW_XOR, f->xor)) | |
582 | goto nla_put_failure; | |
e5dfb815 | 583 | } |
1b34ec43 DM |
584 | if (f->rshift && |
585 | nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift)) | |
586 | goto nla_put_failure; | |
587 | if (f->addend && | |
588 | nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend)) | |
589 | goto nla_put_failure; | |
e5dfb815 | 590 | |
1b34ec43 DM |
591 | if (f->divisor && |
592 | nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor)) | |
593 | goto nla_put_failure; | |
594 | if (f->baseclass && | |
595 | nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass)) | |
596 | goto nla_put_failure; | |
e5dfb815 | 597 | |
1b34ec43 DM |
598 | if (f->perturb_period && |
599 | nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ)) | |
600 | goto nla_put_failure; | |
72d9794f | 601 | |
e5dfb815 PM |
602 | if (tcf_exts_dump(skb, &f->exts, &flow_ext_map) < 0) |
603 | goto nla_put_failure; | |
0aead543 | 604 | #ifdef CONFIG_NET_EMATCH |
e5dfb815 PM |
605 | if (f->ematches.hdr.nmatches && |
606 | tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0) | |
607 | goto nla_put_failure; | |
0aead543 | 608 | #endif |
e5dfb815 PM |
609 | nla_nest_end(skb, nest); |
610 | ||
611 | if (tcf_exts_dump_stats(skb, &f->exts, &flow_ext_map) < 0) | |
612 | goto nla_put_failure; | |
613 | ||
614 | return skb->len; | |
615 | ||
616 | nla_put_failure: | |
617 | nlmsg_trim(skb, nest); | |
618 | return -1; | |
619 | } | |
620 | ||
621 | static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
622 | { | |
623 | struct flow_head *head = tp->root; | |
624 | struct flow_filter *f; | |
625 | ||
626 | list_for_each_entry(f, &head->filters, list) { | |
627 | if (arg->count < arg->skip) | |
628 | goto skip; | |
629 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
630 | arg->stop = 1; | |
631 | break; | |
632 | } | |
633 | skip: | |
634 | arg->count++; | |
635 | } | |
636 | } | |
637 | ||
638 | static struct tcf_proto_ops cls_flow_ops __read_mostly = { | |
639 | .kind = "flow", | |
640 | .classify = flow_classify, | |
641 | .init = flow_init, | |
642 | .destroy = flow_destroy, | |
643 | .change = flow_change, | |
644 | .delete = flow_delete, | |
645 | .get = flow_get, | |
646 | .put = flow_put, | |
647 | .dump = flow_dump, | |
648 | .walk = flow_walk, | |
649 | .owner = THIS_MODULE, | |
650 | }; | |
651 | ||
652 | static int __init cls_flow_init(void) | |
653 | { | |
654 | return register_tcf_proto_ops(&cls_flow_ops); | |
655 | } | |
656 | ||
657 | static void __exit cls_flow_exit(void) | |
658 | { | |
659 | unregister_tcf_proto_ops(&cls_flow_ops); | |
660 | } | |
661 | ||
662 | module_init(cls_flow_init); | |
663 | module_exit(cls_flow_exit); | |
664 | ||
665 | MODULE_LICENSE("GPL"); | |
666 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
667 | MODULE_DESCRIPTION("TC flow classifier"); |