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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/cls_rsvp.h Template file for RSVPv[46] classifiers. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | */ | |
11 | ||
12 | /* | |
13 | Comparing to general packet classification problem, | |
14 | RSVP needs only sevaral relatively simple rules: | |
15 | ||
16 | * (dst, protocol) are always specified, | |
17 | so that we are able to hash them. | |
18 | * src may be exact, or may be wildcard, so that | |
19 | we can keep a hash table plus one wildcard entry. | |
20 | * source port (or flow label) is important only if src is given. | |
21 | ||
22 | IMPLEMENTATION. | |
23 | ||
24 | We use a two level hash table: The top level is keyed by | |
25 | destination address and protocol ID, every bucket contains a list | |
26 | of "rsvp sessions", identified by destination address, protocol and | |
27 | DPI(="Destination Port ID"): triple (key, mask, offset). | |
28 | ||
29 | Every bucket has a smaller hash table keyed by source address | |
30 | (cf. RSVP flowspec) and one wildcard entry for wildcard reservations. | |
31 | Every bucket is again a list of "RSVP flows", selected by | |
32 | source address and SPI(="Source Port ID" here rather than | |
33 | "security parameter index"): triple (key, mask, offset). | |
34 | ||
35 | ||
36 | NOTE 1. All the packets with IPv6 extension headers (but AH and ESP) | |
37 | and all fragmented packets go to the best-effort traffic class. | |
38 | ||
39 | ||
40 | NOTE 2. Two "port id"'s seems to be redundant, rfc2207 requires | |
41 | only one "Generalized Port Identifier". So that for classic | |
42 | ah, esp (and udp,tcp) both *pi should coincide or one of them | |
43 | should be wildcard. | |
44 | ||
45 | At first sight, this redundancy is just a waste of CPU | |
46 | resources. But DPI and SPI add the possibility to assign different | |
47 | priorities to GPIs. Look also at note 4 about tunnels below. | |
48 | ||
49 | ||
50 | NOTE 3. One complication is the case of tunneled packets. | |
51 | We implement it as following: if the first lookup | |
52 | matches a special session with "tunnelhdr" value not zero, | |
53 | flowid doesn't contain the true flow ID, but the tunnel ID (1...255). | |
54 | In this case, we pull tunnelhdr bytes and restart lookup | |
55 | with tunnel ID added to the list of keys. Simple and stupid 8)8) | |
56 | It's enough for PIMREG and IPIP. | |
57 | ||
58 | ||
59 | NOTE 4. Two GPIs make it possible to parse even GRE packets. | |
60 | F.e. DPI can select ETH_P_IP (and necessary flags to make | |
61 | tunnelhdr correct) in GRE protocol field and SPI matches | |
62 | GRE key. Is it not nice? 8)8) | |
63 | ||
64 | ||
65 | Well, as result, despite its simplicity, we get a pretty | |
66 | powerful classification engine. */ | |
67 | ||
1da177e4 | 68 | |
cc7ec456 | 69 | struct rsvp_head { |
1da177e4 LT |
70 | u32 tmap[256/32]; |
71 | u32 hgenerator; | |
72 | u8 tgenerator; | |
b929d86d JF |
73 | struct rsvp_session __rcu *ht[256]; |
74 | struct rcu_head rcu; | |
1da177e4 LT |
75 | }; |
76 | ||
cc7ec456 | 77 | struct rsvp_session { |
b929d86d JF |
78 | struct rsvp_session __rcu *next; |
79 | __be32 dst[RSVP_DST_LEN]; | |
80 | struct tc_rsvp_gpi dpi; | |
81 | u8 protocol; | |
82 | u8 tunnelid; | |
1da177e4 | 83 | /* 16 (src,sport) hash slots, and one wildcard source slot */ |
b929d86d JF |
84 | struct rsvp_filter __rcu *ht[16 + 1]; |
85 | struct rcu_head rcu; | |
1da177e4 LT |
86 | }; |
87 | ||
88 | ||
cc7ec456 | 89 | struct rsvp_filter { |
b929d86d JF |
90 | struct rsvp_filter __rcu *next; |
91 | __be32 src[RSVP_DST_LEN]; | |
92 | struct tc_rsvp_gpi spi; | |
93 | u8 tunnelhdr; | |
1da177e4 | 94 | |
b929d86d JF |
95 | struct tcf_result res; |
96 | struct tcf_exts exts; | |
1da177e4 | 97 | |
b929d86d JF |
98 | u32 handle; |
99 | struct rsvp_session *sess; | |
d4f84a41 CW |
100 | union { |
101 | struct work_struct work; | |
102 | struct rcu_head rcu; | |
103 | }; | |
1da177e4 LT |
104 | }; |
105 | ||
cc7ec456 | 106 | static inline unsigned int hash_dst(__be32 *dst, u8 protocol, u8 tunnelid) |
1da177e4 | 107 | { |
cc7ec456 ED |
108 | unsigned int h = (__force __u32)dst[RSVP_DST_LEN - 1]; |
109 | ||
1da177e4 LT |
110 | h ^= h>>16; |
111 | h ^= h>>8; | |
112 | return (h ^ protocol ^ tunnelid) & 0xFF; | |
113 | } | |
114 | ||
cc7ec456 | 115 | static inline unsigned int hash_src(__be32 *src) |
1da177e4 | 116 | { |
cc7ec456 ED |
117 | unsigned int h = (__force __u32)src[RSVP_DST_LEN-1]; |
118 | ||
1da177e4 LT |
119 | h ^= h>>16; |
120 | h ^= h>>8; | |
121 | h ^= h>>4; | |
122 | return h & 0xF; | |
123 | } | |
124 | ||
1da177e4 LT |
125 | #define RSVP_APPLY_RESULT() \ |
126 | { \ | |
127 | int r = tcf_exts_exec(skb, &f->exts, res); \ | |
128 | if (r < 0) \ | |
129 | continue; \ | |
130 | else if (r > 0) \ | |
131 | return r; \ | |
132 | } | |
10297b99 | 133 | |
dc7f9f6e | 134 | static int rsvp_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
135 | struct tcf_result *res) |
136 | { | |
b929d86d | 137 | struct rsvp_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
138 | struct rsvp_session *s; |
139 | struct rsvp_filter *f; | |
cc7ec456 | 140 | unsigned int h1, h2; |
66c6f529 | 141 | __be32 *dst, *src; |
1da177e4 LT |
142 | u8 protocol; |
143 | u8 tunnelid = 0; | |
144 | u8 *xprt; | |
145 | #if RSVP_DST_LEN == 4 | |
12dc96d1 CG |
146 | struct ipv6hdr *nhptr; |
147 | ||
148 | if (!pskb_network_may_pull(skb, sizeof(*nhptr))) | |
149 | return -1; | |
150 | nhptr = ipv6_hdr(skb); | |
1da177e4 | 151 | #else |
12dc96d1 CG |
152 | struct iphdr *nhptr; |
153 | ||
154 | if (!pskb_network_may_pull(skb, sizeof(*nhptr))) | |
155 | return -1; | |
156 | nhptr = ip_hdr(skb); | |
1da177e4 | 157 | #endif |
1da177e4 LT |
158 | restart: |
159 | ||
160 | #if RSVP_DST_LEN == 4 | |
161 | src = &nhptr->saddr.s6_addr32[0]; | |
162 | dst = &nhptr->daddr.s6_addr32[0]; | |
163 | protocol = nhptr->nexthdr; | |
cc7ec456 | 164 | xprt = ((u8 *)nhptr) + sizeof(struct ipv6hdr); |
1da177e4 LT |
165 | #else |
166 | src = &nhptr->saddr; | |
167 | dst = &nhptr->daddr; | |
168 | protocol = nhptr->protocol; | |
cc7ec456 | 169 | xprt = ((u8 *)nhptr) + (nhptr->ihl<<2); |
56f8a75c | 170 | if (ip_is_fragment(nhptr)) |
1da177e4 LT |
171 | return -1; |
172 | #endif | |
173 | ||
174 | h1 = hash_dst(dst, protocol, tunnelid); | |
175 | h2 = hash_src(src); | |
176 | ||
b929d86d JF |
177 | for (s = rcu_dereference_bh(head->ht[h1]); s; |
178 | s = rcu_dereference_bh(s->next)) { | |
cc7ec456 | 179 | if (dst[RSVP_DST_LEN-1] == s->dst[RSVP_DST_LEN - 1] && |
1da177e4 | 180 | protocol == s->protocol && |
f64f9e71 | 181 | !(s->dpi.mask & |
cc7ec456 | 182 | (*(u32 *)(xprt + s->dpi.offset) ^ s->dpi.key)) && |
1da177e4 | 183 | #if RSVP_DST_LEN == 4 |
f64f9e71 JP |
184 | dst[0] == s->dst[0] && |
185 | dst[1] == s->dst[1] && | |
186 | dst[2] == s->dst[2] && | |
1da177e4 | 187 | #endif |
f64f9e71 | 188 | tunnelid == s->tunnelid) { |
1da177e4 | 189 | |
b929d86d JF |
190 | for (f = rcu_dereference_bh(s->ht[h2]); f; |
191 | f = rcu_dereference_bh(f->next)) { | |
cc7ec456 ED |
192 | if (src[RSVP_DST_LEN-1] == f->src[RSVP_DST_LEN - 1] && |
193 | !(f->spi.mask & (*(u32 *)(xprt + f->spi.offset) ^ f->spi.key)) | |
1da177e4 | 194 | #if RSVP_DST_LEN == 4 |
f64f9e71 JP |
195 | && |
196 | src[0] == f->src[0] && | |
197 | src[1] == f->src[1] && | |
198 | src[2] == f->src[2] | |
1da177e4 LT |
199 | #endif |
200 | ) { | |
201 | *res = f->res; | |
202 | RSVP_APPLY_RESULT(); | |
203 | ||
204 | matched: | |
205 | if (f->tunnelhdr == 0) | |
206 | return 0; | |
207 | ||
208 | tunnelid = f->res.classid; | |
cc7ec456 | 209 | nhptr = (void *)(xprt + f->tunnelhdr - sizeof(*nhptr)); |
1da177e4 LT |
210 | goto restart; |
211 | } | |
212 | } | |
213 | ||
214 | /* And wildcard bucket... */ | |
b929d86d JF |
215 | for (f = rcu_dereference_bh(s->ht[16]); f; |
216 | f = rcu_dereference_bh(f->next)) { | |
1da177e4 LT |
217 | *res = f->res; |
218 | RSVP_APPLY_RESULT(); | |
219 | goto matched; | |
220 | } | |
221 | return -1; | |
222 | } | |
223 | } | |
224 | return -1; | |
225 | } | |
226 | ||
53dfd501 JF |
227 | static void rsvp_replace(struct tcf_proto *tp, struct rsvp_filter *n, u32 h) |
228 | { | |
229 | struct rsvp_head *head = rtnl_dereference(tp->root); | |
230 | struct rsvp_session *s; | |
231 | struct rsvp_filter __rcu **ins; | |
232 | struct rsvp_filter *pins; | |
233 | unsigned int h1 = h & 0xFF; | |
234 | unsigned int h2 = (h >> 8) & 0xFF; | |
235 | ||
236 | for (s = rtnl_dereference(head->ht[h1]); s; | |
237 | s = rtnl_dereference(s->next)) { | |
238 | for (ins = &s->ht[h2], pins = rtnl_dereference(*ins); ; | |
239 | ins = &pins->next, pins = rtnl_dereference(*ins)) { | |
240 | if (pins->handle == h) { | |
241 | RCU_INIT_POINTER(n->next, pins->next); | |
242 | rcu_assign_pointer(*ins, n); | |
243 | return; | |
244 | } | |
245 | } | |
246 | } | |
247 | ||
248 | /* Something went wrong if we are trying to replace a non-existant | |
249 | * node. Mind as well halt instead of silently failing. | |
250 | */ | |
251 | BUG_ON(1); | |
252 | } | |
253 | ||
8113c095 | 254 | static void *rsvp_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 255 | { |
b929d86d | 256 | struct rsvp_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
257 | struct rsvp_session *s; |
258 | struct rsvp_filter *f; | |
cc7ec456 ED |
259 | unsigned int h1 = handle & 0xFF; |
260 | unsigned int h2 = (handle >> 8) & 0xFF; | |
1da177e4 LT |
261 | |
262 | if (h2 > 16) | |
8113c095 | 263 | return NULL; |
1da177e4 | 264 | |
b929d86d JF |
265 | for (s = rtnl_dereference(head->ht[h1]); s; |
266 | s = rtnl_dereference(s->next)) { | |
267 | for (f = rtnl_dereference(s->ht[h2]); f; | |
268 | f = rtnl_dereference(f->next)) { | |
1da177e4 | 269 | if (f->handle == handle) |
8113c095 | 270 | return f; |
1da177e4 LT |
271 | } |
272 | } | |
8113c095 | 273 | return NULL; |
1da177e4 LT |
274 | } |
275 | ||
1da177e4 LT |
276 | static int rsvp_init(struct tcf_proto *tp) |
277 | { | |
278 | struct rsvp_head *data; | |
279 | ||
0da974f4 | 280 | data = kzalloc(sizeof(struct rsvp_head), GFP_KERNEL); |
1da177e4 | 281 | if (data) { |
b929d86d | 282 | rcu_assign_pointer(tp->root, data); |
1da177e4 LT |
283 | return 0; |
284 | } | |
285 | return -ENOBUFS; | |
286 | } | |
287 | ||
96585063 CW |
288 | static void __rsvp_delete_filter(struct rsvp_filter *f) |
289 | { | |
290 | tcf_exts_destroy(&f->exts); | |
291 | tcf_exts_put_net(&f->exts); | |
292 | kfree(f); | |
293 | } | |
294 | ||
d4f84a41 | 295 | static void rsvp_delete_filter_work(struct work_struct *work) |
1da177e4 | 296 | { |
d4f84a41 | 297 | struct rsvp_filter *f = container_of(work, struct rsvp_filter, work); |
9e528d89 | 298 | |
d4f84a41 | 299 | rtnl_lock(); |
96585063 | 300 | __rsvp_delete_filter(f); |
d4f84a41 CW |
301 | rtnl_unlock(); |
302 | } | |
303 | ||
304 | static void rsvp_delete_filter_rcu(struct rcu_head *head) | |
305 | { | |
306 | struct rsvp_filter *f = container_of(head, struct rsvp_filter, rcu); | |
307 | ||
308 | INIT_WORK(&f->work, rsvp_delete_filter_work); | |
309 | tcf_queue_work(&f->work); | |
9e528d89 AS |
310 | } |
311 | ||
312 | static void rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f) | |
313 | { | |
314 | tcf_unbind_filter(tp, &f->res); | |
315 | /* all classifiers are required to call tcf_exts_destroy() after rcu | |
316 | * grace period, since converted-to-rcu actions are relying on that | |
317 | * in cleanup() callback | |
318 | */ | |
96585063 CW |
319 | if (tcf_exts_get_net(&f->exts)) |
320 | call_rcu(&f->rcu, rsvp_delete_filter_rcu); | |
321 | else | |
322 | __rsvp_delete_filter(f); | |
1da177e4 LT |
323 | } |
324 | ||
763dbf63 | 325 | static void rsvp_destroy(struct tcf_proto *tp) |
1da177e4 | 326 | { |
b929d86d | 327 | struct rsvp_head *data = rtnl_dereference(tp->root); |
1da177e4 LT |
328 | int h1, h2; |
329 | ||
330 | if (data == NULL) | |
763dbf63 | 331 | return; |
1da177e4 | 332 | |
cc7ec456 | 333 | for (h1 = 0; h1 < 256; h1++) { |
1da177e4 LT |
334 | struct rsvp_session *s; |
335 | ||
b929d86d JF |
336 | while ((s = rtnl_dereference(data->ht[h1])) != NULL) { |
337 | RCU_INIT_POINTER(data->ht[h1], s->next); | |
1da177e4 | 338 | |
cc7ec456 | 339 | for (h2 = 0; h2 <= 16; h2++) { |
1da177e4 LT |
340 | struct rsvp_filter *f; |
341 | ||
b929d86d JF |
342 | while ((f = rtnl_dereference(s->ht[h2])) != NULL) { |
343 | rcu_assign_pointer(s->ht[h2], f->next); | |
1da177e4 LT |
344 | rsvp_delete_filter(tp, f); |
345 | } | |
346 | } | |
b929d86d | 347 | kfree_rcu(s, rcu); |
1da177e4 LT |
348 | } |
349 | } | |
b929d86d | 350 | kfree_rcu(data, rcu); |
1da177e4 LT |
351 | } |
352 | ||
8113c095 | 353 | static int rsvp_delete(struct tcf_proto *tp, void *arg, bool *last) |
1da177e4 | 354 | { |
b929d86d | 355 | struct rsvp_head *head = rtnl_dereference(tp->root); |
8113c095 | 356 | struct rsvp_filter *nfp, *f = arg; |
b929d86d | 357 | struct rsvp_filter __rcu **fp; |
cc7ec456 | 358 | unsigned int h = f->handle; |
b929d86d JF |
359 | struct rsvp_session __rcu **sp; |
360 | struct rsvp_session *nsp, *s = f->sess; | |
763dbf63 | 361 | int i, h1; |
1da177e4 | 362 | |
b929d86d JF |
363 | fp = &s->ht[(h >> 8) & 0xFF]; |
364 | for (nfp = rtnl_dereference(*fp); nfp; | |
365 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) { | |
366 | if (nfp == f) { | |
367 | RCU_INIT_POINTER(*fp, f->next); | |
1da177e4 LT |
368 | rsvp_delete_filter(tp, f); |
369 | ||
370 | /* Strip tree */ | |
371 | ||
cc7ec456 | 372 | for (i = 0; i <= 16; i++) |
1da177e4 | 373 | if (s->ht[i]) |
763dbf63 | 374 | goto out; |
1da177e4 LT |
375 | |
376 | /* OK, session has no flows */ | |
b929d86d JF |
377 | sp = &head->ht[h & 0xFF]; |
378 | for (nsp = rtnl_dereference(*sp); nsp; | |
379 | sp = &nsp->next, nsp = rtnl_dereference(*sp)) { | |
380 | if (nsp == s) { | |
381 | RCU_INIT_POINTER(*sp, s->next); | |
382 | kfree_rcu(s, rcu); | |
763dbf63 | 383 | goto out; |
1da177e4 LT |
384 | } |
385 | } | |
386 | ||
763dbf63 WC |
387 | break; |
388 | } | |
389 | } | |
390 | ||
391 | out: | |
392 | *last = true; | |
393 | for (h1 = 0; h1 < 256; h1++) { | |
394 | if (rcu_access_pointer(head->ht[h1])) { | |
395 | *last = false; | |
396 | break; | |
1da177e4 LT |
397 | } |
398 | } | |
763dbf63 | 399 | |
1da177e4 LT |
400 | return 0; |
401 | } | |
402 | ||
cc7ec456 | 403 | static unsigned int gen_handle(struct tcf_proto *tp, unsigned salt) |
1da177e4 | 404 | { |
b929d86d | 405 | struct rsvp_head *data = rtnl_dereference(tp->root); |
1da177e4 LT |
406 | int i = 0xFFFF; |
407 | ||
408 | while (i-- > 0) { | |
409 | u32 h; | |
cc7ec456 | 410 | |
1da177e4 LT |
411 | if ((data->hgenerator += 0x10000) == 0) |
412 | data->hgenerator = 0x10000; | |
413 | h = data->hgenerator|salt; | |
230cfd2d | 414 | if (!rsvp_get(tp, h)) |
1da177e4 LT |
415 | return h; |
416 | } | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static int tunnel_bts(struct rsvp_head *data) | |
421 | { | |
cc7ec456 ED |
422 | int n = data->tgenerator >> 5; |
423 | u32 b = 1 << (data->tgenerator & 0x1F); | |
10297b99 | 424 | |
cc7ec456 | 425 | if (data->tmap[n] & b) |
1da177e4 LT |
426 | return 0; |
427 | data->tmap[n] |= b; | |
428 | return 1; | |
429 | } | |
430 | ||
431 | static void tunnel_recycle(struct rsvp_head *data) | |
432 | { | |
b929d86d | 433 | struct rsvp_session __rcu **sht = data->ht; |
1da177e4 LT |
434 | u32 tmap[256/32]; |
435 | int h1, h2; | |
436 | ||
437 | memset(tmap, 0, sizeof(tmap)); | |
438 | ||
cc7ec456 | 439 | for (h1 = 0; h1 < 256; h1++) { |
1da177e4 | 440 | struct rsvp_session *s; |
b929d86d JF |
441 | for (s = rtnl_dereference(sht[h1]); s; |
442 | s = rtnl_dereference(s->next)) { | |
cc7ec456 | 443 | for (h2 = 0; h2 <= 16; h2++) { |
1da177e4 LT |
444 | struct rsvp_filter *f; |
445 | ||
b929d86d JF |
446 | for (f = rtnl_dereference(s->ht[h2]); f; |
447 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
448 | if (f->tunnelhdr == 0) |
449 | continue; | |
450 | data->tgenerator = f->res.classid; | |
451 | tunnel_bts(data); | |
452 | } | |
453 | } | |
454 | } | |
455 | } | |
456 | ||
457 | memcpy(data->tmap, tmap, sizeof(tmap)); | |
458 | } | |
459 | ||
460 | static u32 gen_tunnel(struct rsvp_head *data) | |
461 | { | |
462 | int i, k; | |
463 | ||
cc7ec456 ED |
464 | for (k = 0; k < 2; k++) { |
465 | for (i = 255; i > 0; i--) { | |
1da177e4 LT |
466 | if (++data->tgenerator == 0) |
467 | data->tgenerator = 1; | |
468 | if (tunnel_bts(data)) | |
469 | return data->tgenerator; | |
470 | } | |
471 | tunnel_recycle(data); | |
472 | } | |
473 | return 0; | |
474 | } | |
475 | ||
6fa8c014 PM |
476 | static const struct nla_policy rsvp_policy[TCA_RSVP_MAX + 1] = { |
477 | [TCA_RSVP_CLASSID] = { .type = NLA_U32 }, | |
478 | [TCA_RSVP_DST] = { .type = NLA_BINARY, | |
479 | .len = RSVP_DST_LEN * sizeof(u32) }, | |
480 | [TCA_RSVP_SRC] = { .type = NLA_BINARY, | |
481 | .len = RSVP_DST_LEN * sizeof(u32) }, | |
482 | [TCA_RSVP_PINFO] = { .len = sizeof(struct tc_rsvp_pinfo) }, | |
483 | }; | |
484 | ||
c1b52739 | 485 | static int rsvp_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 486 | struct tcf_proto *tp, unsigned long base, |
1da177e4 | 487 | u32 handle, |
add93b61 | 488 | struct nlattr **tca, |
8113c095 | 489 | void **arg, bool ovr) |
1da177e4 | 490 | { |
b929d86d JF |
491 | struct rsvp_head *data = rtnl_dereference(tp->root); |
492 | struct rsvp_filter *f, *nfp; | |
493 | struct rsvp_filter __rcu **fp; | |
494 | struct rsvp_session *nsp, *s; | |
495 | struct rsvp_session __rcu **sp; | |
1da177e4 | 496 | struct tc_rsvp_pinfo *pinfo = NULL; |
27e95a8c | 497 | struct nlattr *opt = tca[TCA_OPTIONS]; |
add93b61 | 498 | struct nlattr *tb[TCA_RSVP_MAX + 1]; |
1da177e4 | 499 | struct tcf_exts e; |
cc7ec456 | 500 | unsigned int h1, h2; |
66c6f529 | 501 | __be32 *dst; |
1da177e4 LT |
502 | int err; |
503 | ||
504 | if (opt == NULL) | |
505 | return handle ? -EINVAL : 0; | |
506 | ||
fceb6435 | 507 | err = nla_parse_nested(tb, TCA_RSVP_MAX, opt, rsvp_policy, NULL); |
cee63723 PM |
508 | if (err < 0) |
509 | return err; | |
1da177e4 | 510 | |
b9a24bb7 | 511 | err = tcf_exts_init(&e, TCA_RSVP_ACT, TCA_RSVP_POLICE); |
1da177e4 LT |
512 | if (err < 0) |
513 | return err; | |
b9a24bb7 WC |
514 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr); |
515 | if (err < 0) | |
516 | goto errout2; | |
1da177e4 | 517 | |
8113c095 | 518 | f = *arg; |
cc7ec456 | 519 | if (f) { |
1da177e4 | 520 | /* Node exists: adjust only classid */ |
53dfd501 | 521 | struct rsvp_filter *n; |
1da177e4 LT |
522 | |
523 | if (f->handle != handle && handle) | |
524 | goto errout2; | |
53dfd501 JF |
525 | |
526 | n = kmemdup(f, sizeof(*f), GFP_KERNEL); | |
527 | if (!n) { | |
528 | err = -ENOMEM; | |
529 | goto errout2; | |
530 | } | |
531 | ||
b9a24bb7 WC |
532 | err = tcf_exts_init(&n->exts, TCA_RSVP_ACT, TCA_RSVP_POLICE); |
533 | if (err < 0) { | |
534 | kfree(n); | |
535 | goto errout2; | |
536 | } | |
53dfd501 | 537 | |
27e95a8c | 538 | if (tb[TCA_RSVP_CLASSID]) { |
53dfd501 JF |
539 | n->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]); |
540 | tcf_bind_filter(tp, &n->res, base); | |
1da177e4 LT |
541 | } |
542 | ||
9b0d4446 | 543 | tcf_exts_change(&n->exts, &e); |
53dfd501 | 544 | rsvp_replace(tp, n, handle); |
1da177e4 LT |
545 | return 0; |
546 | } | |
547 | ||
548 | /* Now more serious part... */ | |
549 | err = -EINVAL; | |
550 | if (handle) | |
551 | goto errout2; | |
27e95a8c | 552 | if (tb[TCA_RSVP_DST] == NULL) |
1da177e4 LT |
553 | goto errout2; |
554 | ||
555 | err = -ENOBUFS; | |
0da974f4 | 556 | f = kzalloc(sizeof(struct rsvp_filter), GFP_KERNEL); |
1da177e4 LT |
557 | if (f == NULL) |
558 | goto errout2; | |
559 | ||
b9a24bb7 WC |
560 | err = tcf_exts_init(&f->exts, TCA_RSVP_ACT, TCA_RSVP_POLICE); |
561 | if (err < 0) | |
562 | goto errout; | |
1da177e4 | 563 | h2 = 16; |
27e95a8c IM |
564 | if (tb[TCA_RSVP_SRC]) { |
565 | memcpy(f->src, nla_data(tb[TCA_RSVP_SRC]), sizeof(f->src)); | |
1da177e4 LT |
566 | h2 = hash_src(f->src); |
567 | } | |
27e95a8c IM |
568 | if (tb[TCA_RSVP_PINFO]) { |
569 | pinfo = nla_data(tb[TCA_RSVP_PINFO]); | |
1da177e4 LT |
570 | f->spi = pinfo->spi; |
571 | f->tunnelhdr = pinfo->tunnelhdr; | |
572 | } | |
27e95a8c IM |
573 | if (tb[TCA_RSVP_CLASSID]) |
574 | f->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]); | |
1da177e4 | 575 | |
27e95a8c | 576 | dst = nla_data(tb[TCA_RSVP_DST]); |
1da177e4 LT |
577 | h1 = hash_dst(dst, pinfo ? pinfo->protocol : 0, pinfo ? pinfo->tunnelid : 0); |
578 | ||
579 | err = -ENOMEM; | |
580 | if ((f->handle = gen_handle(tp, h1 | (h2<<8))) == 0) | |
581 | goto errout; | |
582 | ||
583 | if (f->tunnelhdr) { | |
584 | err = -EINVAL; | |
585 | if (f->res.classid > 255) | |
586 | goto errout; | |
587 | ||
588 | err = -ENOMEM; | |
589 | if (f->res.classid == 0 && | |
590 | (f->res.classid = gen_tunnel(data)) == 0) | |
591 | goto errout; | |
592 | } | |
593 | ||
b929d86d JF |
594 | for (sp = &data->ht[h1]; |
595 | (s = rtnl_dereference(*sp)) != NULL; | |
596 | sp = &s->next) { | |
1da177e4 LT |
597 | if (dst[RSVP_DST_LEN-1] == s->dst[RSVP_DST_LEN-1] && |
598 | pinfo && pinfo->protocol == s->protocol && | |
f64f9e71 | 599 | memcmp(&pinfo->dpi, &s->dpi, sizeof(s->dpi)) == 0 && |
1da177e4 | 600 | #if RSVP_DST_LEN == 4 |
f64f9e71 JP |
601 | dst[0] == s->dst[0] && |
602 | dst[1] == s->dst[1] && | |
603 | dst[2] == s->dst[2] && | |
1da177e4 | 604 | #endif |
f64f9e71 | 605 | pinfo->tunnelid == s->tunnelid) { |
1da177e4 LT |
606 | |
607 | insert: | |
608 | /* OK, we found appropriate session */ | |
609 | ||
610 | fp = &s->ht[h2]; | |
611 | ||
612 | f->sess = s; | |
613 | if (f->tunnelhdr == 0) | |
614 | tcf_bind_filter(tp, &f->res, base); | |
615 | ||
9b0d4446 | 616 | tcf_exts_change(&f->exts, &e); |
1da177e4 | 617 | |
b929d86d JF |
618 | fp = &s->ht[h2]; |
619 | for (nfp = rtnl_dereference(*fp); nfp; | |
620 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) { | |
621 | __u32 mask = nfp->spi.mask & f->spi.mask; | |
622 | ||
623 | if (mask != f->spi.mask) | |
1da177e4 | 624 | break; |
b929d86d JF |
625 | } |
626 | RCU_INIT_POINTER(f->next, nfp); | |
627 | rcu_assign_pointer(*fp, f); | |
1da177e4 | 628 | |
8113c095 | 629 | *arg = f; |
1da177e4 LT |
630 | return 0; |
631 | } | |
632 | } | |
633 | ||
634 | /* No session found. Create new one. */ | |
635 | ||
636 | err = -ENOBUFS; | |
0da974f4 | 637 | s = kzalloc(sizeof(struct rsvp_session), GFP_KERNEL); |
1da177e4 LT |
638 | if (s == NULL) |
639 | goto errout; | |
1da177e4 LT |
640 | memcpy(s->dst, dst, sizeof(s->dst)); |
641 | ||
642 | if (pinfo) { | |
643 | s->dpi = pinfo->dpi; | |
644 | s->protocol = pinfo->protocol; | |
645 | s->tunnelid = pinfo->tunnelid; | |
646 | } | |
b929d86d JF |
647 | sp = &data->ht[h1]; |
648 | for (nsp = rtnl_dereference(*sp); nsp; | |
649 | sp = &nsp->next, nsp = rtnl_dereference(*sp)) { | |
650 | if ((nsp->dpi.mask & s->dpi.mask) != s->dpi.mask) | |
1da177e4 LT |
651 | break; |
652 | } | |
b929d86d JF |
653 | RCU_INIT_POINTER(s->next, nsp); |
654 | rcu_assign_pointer(*sp, s); | |
10297b99 | 655 | |
1da177e4 LT |
656 | goto insert; |
657 | ||
658 | errout: | |
b9a24bb7 | 659 | tcf_exts_destroy(&f->exts); |
a51482bd | 660 | kfree(f); |
1da177e4 | 661 | errout2: |
18d0264f | 662 | tcf_exts_destroy(&e); |
1da177e4 LT |
663 | return err; |
664 | } | |
665 | ||
666 | static void rsvp_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
667 | { | |
b929d86d | 668 | struct rsvp_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 669 | unsigned int h, h1; |
1da177e4 LT |
670 | |
671 | if (arg->stop) | |
672 | return; | |
673 | ||
674 | for (h = 0; h < 256; h++) { | |
675 | struct rsvp_session *s; | |
676 | ||
b929d86d JF |
677 | for (s = rtnl_dereference(head->ht[h]); s; |
678 | s = rtnl_dereference(s->next)) { | |
1da177e4 LT |
679 | for (h1 = 0; h1 <= 16; h1++) { |
680 | struct rsvp_filter *f; | |
681 | ||
b929d86d JF |
682 | for (f = rtnl_dereference(s->ht[h1]); f; |
683 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
684 | if (arg->count < arg->skip) { |
685 | arg->count++; | |
686 | continue; | |
687 | } | |
8113c095 | 688 | if (arg->fn(tp, f, arg) < 0) { |
1da177e4 LT |
689 | arg->stop = 1; |
690 | return; | |
691 | } | |
692 | arg->count++; | |
693 | } | |
694 | } | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
8113c095 | 699 | static int rsvp_dump(struct net *net, struct tcf_proto *tp, void *fh, |
1da177e4 LT |
700 | struct sk_buff *skb, struct tcmsg *t) |
701 | { | |
8113c095 | 702 | struct rsvp_filter *f = fh; |
1da177e4 | 703 | struct rsvp_session *s; |
4b3550ef | 704 | struct nlattr *nest; |
1da177e4 LT |
705 | struct tc_rsvp_pinfo pinfo; |
706 | ||
707 | if (f == NULL) | |
708 | return skb->len; | |
709 | s = f->sess; | |
710 | ||
711 | t->tcm_handle = f->handle; | |
712 | ||
4b3550ef PM |
713 | nest = nla_nest_start(skb, TCA_OPTIONS); |
714 | if (nest == NULL) | |
715 | goto nla_put_failure; | |
1da177e4 | 716 | |
1b34ec43 DM |
717 | if (nla_put(skb, TCA_RSVP_DST, sizeof(s->dst), &s->dst)) |
718 | goto nla_put_failure; | |
1da177e4 LT |
719 | pinfo.dpi = s->dpi; |
720 | pinfo.spi = f->spi; | |
721 | pinfo.protocol = s->protocol; | |
722 | pinfo.tunnelid = s->tunnelid; | |
723 | pinfo.tunnelhdr = f->tunnelhdr; | |
8a47077a | 724 | pinfo.pad = 0; |
1b34ec43 DM |
725 | if (nla_put(skb, TCA_RSVP_PINFO, sizeof(pinfo), &pinfo)) |
726 | goto nla_put_failure; | |
727 | if (f->res.classid && | |
728 | nla_put_u32(skb, TCA_RSVP_CLASSID, f->res.classid)) | |
729 | goto nla_put_failure; | |
730 | if (((f->handle >> 8) & 0xFF) != 16 && | |
731 | nla_put(skb, TCA_RSVP_SRC, sizeof(f->src), f->src)) | |
732 | goto nla_put_failure; | |
1da177e4 | 733 | |
5da57f42 | 734 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 735 | goto nla_put_failure; |
1da177e4 | 736 | |
4b3550ef | 737 | nla_nest_end(skb, nest); |
1da177e4 | 738 | |
5da57f42 | 739 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 740 | goto nla_put_failure; |
1da177e4 LT |
741 | return skb->len; |
742 | ||
add93b61 | 743 | nla_put_failure: |
6ea3b446 | 744 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
745 | return -1; |
746 | } | |
747 | ||
07d79fc7 CW |
748 | static void rsvp_bind_class(void *fh, u32 classid, unsigned long cl) |
749 | { | |
750 | struct rsvp_filter *f = fh; | |
751 | ||
752 | if (f && f->res.classid == classid) | |
753 | f->res.class = cl; | |
754 | } | |
755 | ||
27e95a8c | 756 | static struct tcf_proto_ops RSVP_OPS __read_mostly = { |
1da177e4 LT |
757 | .kind = RSVP_ID, |
758 | .classify = rsvp_classify, | |
759 | .init = rsvp_init, | |
760 | .destroy = rsvp_destroy, | |
761 | .get = rsvp_get, | |
1da177e4 LT |
762 | .change = rsvp_change, |
763 | .delete = rsvp_delete, | |
764 | .walk = rsvp_walk, | |
765 | .dump = rsvp_dump, | |
07d79fc7 | 766 | .bind_class = rsvp_bind_class, |
1da177e4 LT |
767 | .owner = THIS_MODULE, |
768 | }; | |
769 | ||
770 | static int __init init_rsvp(void) | |
771 | { | |
772 | return register_tcf_proto_ops(&RSVP_OPS); | |
773 | } | |
774 | ||
10297b99 | 775 | static void __exit exit_rsvp(void) |
1da177e4 LT |
776 | { |
777 | unregister_tcf_proto_ops(&RSVP_OPS); | |
778 | } | |
779 | ||
780 | module_init(init_rsvp) | |
781 | module_exit(exit_rsvp) |