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; | |
100 | struct rcu_head rcu; | |
1da177e4 LT |
101 | }; |
102 | ||
cc7ec456 | 103 | static inline unsigned int hash_dst(__be32 *dst, u8 protocol, u8 tunnelid) |
1da177e4 | 104 | { |
cc7ec456 ED |
105 | unsigned int h = (__force __u32)dst[RSVP_DST_LEN - 1]; |
106 | ||
1da177e4 LT |
107 | h ^= h>>16; |
108 | h ^= h>>8; | |
109 | return (h ^ protocol ^ tunnelid) & 0xFF; | |
110 | } | |
111 | ||
cc7ec456 | 112 | static inline unsigned int hash_src(__be32 *src) |
1da177e4 | 113 | { |
cc7ec456 ED |
114 | unsigned int h = (__force __u32)src[RSVP_DST_LEN-1]; |
115 | ||
1da177e4 LT |
116 | h ^= h>>16; |
117 | h ^= h>>8; | |
118 | h ^= h>>4; | |
119 | return h & 0xF; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | #define RSVP_APPLY_RESULT() \ |
123 | { \ | |
124 | int r = tcf_exts_exec(skb, &f->exts, res); \ | |
125 | if (r < 0) \ | |
126 | continue; \ | |
127 | else if (r > 0) \ | |
128 | return r; \ | |
129 | } | |
10297b99 | 130 | |
dc7f9f6e | 131 | static int rsvp_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
132 | struct tcf_result *res) |
133 | { | |
b929d86d | 134 | struct rsvp_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
135 | struct rsvp_session *s; |
136 | struct rsvp_filter *f; | |
cc7ec456 | 137 | unsigned int h1, h2; |
66c6f529 | 138 | __be32 *dst, *src; |
1da177e4 LT |
139 | u8 protocol; |
140 | u8 tunnelid = 0; | |
141 | u8 *xprt; | |
142 | #if RSVP_DST_LEN == 4 | |
12dc96d1 CG |
143 | struct ipv6hdr *nhptr; |
144 | ||
145 | if (!pskb_network_may_pull(skb, sizeof(*nhptr))) | |
146 | return -1; | |
147 | nhptr = ipv6_hdr(skb); | |
1da177e4 | 148 | #else |
12dc96d1 CG |
149 | struct iphdr *nhptr; |
150 | ||
151 | if (!pskb_network_may_pull(skb, sizeof(*nhptr))) | |
152 | return -1; | |
153 | nhptr = ip_hdr(skb); | |
1da177e4 LT |
154 | #endif |
155 | ||
156 | restart: | |
157 | ||
158 | #if RSVP_DST_LEN == 4 | |
159 | src = &nhptr->saddr.s6_addr32[0]; | |
160 | dst = &nhptr->daddr.s6_addr32[0]; | |
161 | protocol = nhptr->nexthdr; | |
cc7ec456 | 162 | xprt = ((u8 *)nhptr) + sizeof(struct ipv6hdr); |
1da177e4 LT |
163 | #else |
164 | src = &nhptr->saddr; | |
165 | dst = &nhptr->daddr; | |
166 | protocol = nhptr->protocol; | |
cc7ec456 | 167 | xprt = ((u8 *)nhptr) + (nhptr->ihl<<2); |
56f8a75c | 168 | if (ip_is_fragment(nhptr)) |
1da177e4 LT |
169 | return -1; |
170 | #endif | |
171 | ||
172 | h1 = hash_dst(dst, protocol, tunnelid); | |
173 | h2 = hash_src(src); | |
174 | ||
b929d86d JF |
175 | for (s = rcu_dereference_bh(head->ht[h1]); s; |
176 | s = rcu_dereference_bh(s->next)) { | |
cc7ec456 | 177 | if (dst[RSVP_DST_LEN-1] == s->dst[RSVP_DST_LEN - 1] && |
1da177e4 | 178 | protocol == s->protocol && |
f64f9e71 | 179 | !(s->dpi.mask & |
cc7ec456 | 180 | (*(u32 *)(xprt + s->dpi.offset) ^ s->dpi.key)) && |
1da177e4 | 181 | #if RSVP_DST_LEN == 4 |
f64f9e71 JP |
182 | dst[0] == s->dst[0] && |
183 | dst[1] == s->dst[1] && | |
184 | dst[2] == s->dst[2] && | |
1da177e4 | 185 | #endif |
f64f9e71 | 186 | tunnelid == s->tunnelid) { |
1da177e4 | 187 | |
b929d86d JF |
188 | for (f = rcu_dereference_bh(s->ht[h2]); f; |
189 | f = rcu_dereference_bh(f->next)) { | |
cc7ec456 ED |
190 | if (src[RSVP_DST_LEN-1] == f->src[RSVP_DST_LEN - 1] && |
191 | !(f->spi.mask & (*(u32 *)(xprt + f->spi.offset) ^ f->spi.key)) | |
1da177e4 | 192 | #if RSVP_DST_LEN == 4 |
f64f9e71 JP |
193 | && |
194 | src[0] == f->src[0] && | |
195 | src[1] == f->src[1] && | |
196 | src[2] == f->src[2] | |
1da177e4 LT |
197 | #endif |
198 | ) { | |
199 | *res = f->res; | |
200 | RSVP_APPLY_RESULT(); | |
201 | ||
202 | matched: | |
203 | if (f->tunnelhdr == 0) | |
204 | return 0; | |
205 | ||
206 | tunnelid = f->res.classid; | |
cc7ec456 | 207 | nhptr = (void *)(xprt + f->tunnelhdr - sizeof(*nhptr)); |
1da177e4 LT |
208 | goto restart; |
209 | } | |
210 | } | |
211 | ||
212 | /* And wildcard bucket... */ | |
b929d86d JF |
213 | for (f = rcu_dereference_bh(s->ht[16]); f; |
214 | f = rcu_dereference_bh(f->next)) { | |
1da177e4 LT |
215 | *res = f->res; |
216 | RSVP_APPLY_RESULT(); | |
217 | goto matched; | |
218 | } | |
219 | return -1; | |
220 | } | |
221 | } | |
222 | return -1; | |
223 | } | |
224 | ||
225 | static unsigned long rsvp_get(struct tcf_proto *tp, u32 handle) | |
226 | { | |
b929d86d | 227 | struct rsvp_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
228 | struct rsvp_session *s; |
229 | struct rsvp_filter *f; | |
cc7ec456 ED |
230 | unsigned int h1 = handle & 0xFF; |
231 | unsigned int h2 = (handle >> 8) & 0xFF; | |
1da177e4 LT |
232 | |
233 | if (h2 > 16) | |
234 | return 0; | |
235 | ||
b929d86d JF |
236 | for (s = rtnl_dereference(head->ht[h1]); s; |
237 | s = rtnl_dereference(s->next)) { | |
238 | for (f = rtnl_dereference(s->ht[h2]); f; | |
239 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
240 | if (f->handle == handle) |
241 | return (unsigned long)f; | |
242 | } | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static void rsvp_put(struct tcf_proto *tp, unsigned long f) | |
248 | { | |
249 | } | |
250 | ||
251 | static int rsvp_init(struct tcf_proto *tp) | |
252 | { | |
253 | struct rsvp_head *data; | |
254 | ||
0da974f4 | 255 | data = kzalloc(sizeof(struct rsvp_head), GFP_KERNEL); |
1da177e4 | 256 | if (data) { |
b929d86d | 257 | rcu_assign_pointer(tp->root, data); |
1da177e4 LT |
258 | return 0; |
259 | } | |
260 | return -ENOBUFS; | |
261 | } | |
262 | ||
cc7ec456 | 263 | static void |
1da177e4 LT |
264 | rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f) |
265 | { | |
266 | tcf_unbind_filter(tp, &f->res); | |
267 | tcf_exts_destroy(tp, &f->exts); | |
b929d86d | 268 | kfree_rcu(f, rcu); |
1da177e4 LT |
269 | } |
270 | ||
271 | static void rsvp_destroy(struct tcf_proto *tp) | |
272 | { | |
b929d86d | 273 | struct rsvp_head *data = rtnl_dereference(tp->root); |
1da177e4 LT |
274 | int h1, h2; |
275 | ||
276 | if (data == NULL) | |
277 | return; | |
278 | ||
b929d86d | 279 | RCU_INIT_POINTER(tp->root, NULL); |
1da177e4 | 280 | |
cc7ec456 | 281 | for (h1 = 0; h1 < 256; h1++) { |
1da177e4 LT |
282 | struct rsvp_session *s; |
283 | ||
b929d86d JF |
284 | while ((s = rtnl_dereference(data->ht[h1])) != NULL) { |
285 | RCU_INIT_POINTER(data->ht[h1], s->next); | |
1da177e4 | 286 | |
cc7ec456 | 287 | for (h2 = 0; h2 <= 16; h2++) { |
1da177e4 LT |
288 | struct rsvp_filter *f; |
289 | ||
b929d86d JF |
290 | while ((f = rtnl_dereference(s->ht[h2])) != NULL) { |
291 | rcu_assign_pointer(s->ht[h2], f->next); | |
1da177e4 LT |
292 | rsvp_delete_filter(tp, f); |
293 | } | |
294 | } | |
b929d86d | 295 | kfree_rcu(s, rcu); |
1da177e4 LT |
296 | } |
297 | } | |
b929d86d | 298 | kfree_rcu(data, rcu); |
1da177e4 LT |
299 | } |
300 | ||
301 | static int rsvp_delete(struct tcf_proto *tp, unsigned long arg) | |
302 | { | |
b929d86d JF |
303 | struct rsvp_head *head = rtnl_dereference(tp->root); |
304 | struct rsvp_filter *nfp, *f = (struct rsvp_filter *)arg; | |
305 | struct rsvp_filter __rcu **fp; | |
cc7ec456 | 306 | unsigned int h = f->handle; |
b929d86d JF |
307 | struct rsvp_session __rcu **sp; |
308 | struct rsvp_session *nsp, *s = f->sess; | |
1da177e4 LT |
309 | int i; |
310 | ||
b929d86d JF |
311 | fp = &s->ht[(h >> 8) & 0xFF]; |
312 | for (nfp = rtnl_dereference(*fp); nfp; | |
313 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) { | |
314 | if (nfp == f) { | |
315 | RCU_INIT_POINTER(*fp, f->next); | |
1da177e4 LT |
316 | rsvp_delete_filter(tp, f); |
317 | ||
318 | /* Strip tree */ | |
319 | ||
cc7ec456 | 320 | for (i = 0; i <= 16; i++) |
1da177e4 LT |
321 | if (s->ht[i]) |
322 | return 0; | |
323 | ||
324 | /* OK, session has no flows */ | |
b929d86d JF |
325 | sp = &head->ht[h & 0xFF]; |
326 | for (nsp = rtnl_dereference(*sp); nsp; | |
327 | sp = &nsp->next, nsp = rtnl_dereference(*sp)) { | |
328 | if (nsp == s) { | |
329 | RCU_INIT_POINTER(*sp, s->next); | |
330 | kfree_rcu(s, rcu); | |
1da177e4 LT |
331 | return 0; |
332 | } | |
333 | } | |
334 | ||
335 | return 0; | |
336 | } | |
337 | } | |
338 | return 0; | |
339 | } | |
340 | ||
cc7ec456 | 341 | static unsigned int gen_handle(struct tcf_proto *tp, unsigned salt) |
1da177e4 | 342 | { |
b929d86d | 343 | struct rsvp_head *data = rtnl_dereference(tp->root); |
1da177e4 LT |
344 | int i = 0xFFFF; |
345 | ||
346 | while (i-- > 0) { | |
347 | u32 h; | |
cc7ec456 | 348 | |
1da177e4 LT |
349 | if ((data->hgenerator += 0x10000) == 0) |
350 | data->hgenerator = 0x10000; | |
351 | h = data->hgenerator|salt; | |
352 | if (rsvp_get(tp, h) == 0) | |
353 | return h; | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static int tunnel_bts(struct rsvp_head *data) | |
359 | { | |
cc7ec456 ED |
360 | int n = data->tgenerator >> 5; |
361 | u32 b = 1 << (data->tgenerator & 0x1F); | |
10297b99 | 362 | |
cc7ec456 | 363 | if (data->tmap[n] & b) |
1da177e4 LT |
364 | return 0; |
365 | data->tmap[n] |= b; | |
366 | return 1; | |
367 | } | |
368 | ||
369 | static void tunnel_recycle(struct rsvp_head *data) | |
370 | { | |
b929d86d | 371 | struct rsvp_session __rcu **sht = data->ht; |
1da177e4 LT |
372 | u32 tmap[256/32]; |
373 | int h1, h2; | |
374 | ||
375 | memset(tmap, 0, sizeof(tmap)); | |
376 | ||
cc7ec456 | 377 | for (h1 = 0; h1 < 256; h1++) { |
1da177e4 | 378 | struct rsvp_session *s; |
b929d86d JF |
379 | for (s = rtnl_dereference(sht[h1]); s; |
380 | s = rtnl_dereference(s->next)) { | |
cc7ec456 | 381 | for (h2 = 0; h2 <= 16; h2++) { |
1da177e4 LT |
382 | struct rsvp_filter *f; |
383 | ||
b929d86d JF |
384 | for (f = rtnl_dereference(s->ht[h2]); f; |
385 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
386 | if (f->tunnelhdr == 0) |
387 | continue; | |
388 | data->tgenerator = f->res.classid; | |
389 | tunnel_bts(data); | |
390 | } | |
391 | } | |
392 | } | |
393 | } | |
394 | ||
395 | memcpy(data->tmap, tmap, sizeof(tmap)); | |
396 | } | |
397 | ||
398 | static u32 gen_tunnel(struct rsvp_head *data) | |
399 | { | |
400 | int i, k; | |
401 | ||
cc7ec456 ED |
402 | for (k = 0; k < 2; k++) { |
403 | for (i = 255; i > 0; i--) { | |
1da177e4 LT |
404 | if (++data->tgenerator == 0) |
405 | data->tgenerator = 1; | |
406 | if (tunnel_bts(data)) | |
407 | return data->tgenerator; | |
408 | } | |
409 | tunnel_recycle(data); | |
410 | } | |
411 | return 0; | |
412 | } | |
413 | ||
6fa8c014 PM |
414 | static const struct nla_policy rsvp_policy[TCA_RSVP_MAX + 1] = { |
415 | [TCA_RSVP_CLASSID] = { .type = NLA_U32 }, | |
416 | [TCA_RSVP_DST] = { .type = NLA_BINARY, | |
417 | .len = RSVP_DST_LEN * sizeof(u32) }, | |
418 | [TCA_RSVP_SRC] = { .type = NLA_BINARY, | |
419 | .len = RSVP_DST_LEN * sizeof(u32) }, | |
420 | [TCA_RSVP_PINFO] = { .len = sizeof(struct tc_rsvp_pinfo) }, | |
421 | }; | |
422 | ||
c1b52739 | 423 | static int rsvp_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 424 | struct tcf_proto *tp, unsigned long base, |
1da177e4 | 425 | u32 handle, |
add93b61 | 426 | struct nlattr **tca, |
2f7ef2f8 | 427 | unsigned long *arg, bool ovr) |
1da177e4 | 428 | { |
b929d86d JF |
429 | struct rsvp_head *data = rtnl_dereference(tp->root); |
430 | struct rsvp_filter *f, *nfp; | |
431 | struct rsvp_filter __rcu **fp; | |
432 | struct rsvp_session *nsp, *s; | |
433 | struct rsvp_session __rcu **sp; | |
1da177e4 | 434 | struct tc_rsvp_pinfo *pinfo = NULL; |
27e95a8c | 435 | struct nlattr *opt = tca[TCA_OPTIONS]; |
add93b61 | 436 | struct nlattr *tb[TCA_RSVP_MAX + 1]; |
1da177e4 | 437 | struct tcf_exts e; |
cc7ec456 | 438 | unsigned int h1, h2; |
66c6f529 | 439 | __be32 *dst; |
1da177e4 LT |
440 | int err; |
441 | ||
442 | if (opt == NULL) | |
443 | return handle ? -EINVAL : 0; | |
444 | ||
6fa8c014 | 445 | err = nla_parse_nested(tb, TCA_RSVP_MAX, opt, rsvp_policy); |
cee63723 PM |
446 | if (err < 0) |
447 | return err; | |
1da177e4 | 448 | |
5da57f42 | 449 | tcf_exts_init(&e, TCA_RSVP_ACT, TCA_RSVP_POLICE); |
2f7ef2f8 | 450 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr); |
1da177e4 LT |
451 | if (err < 0) |
452 | return err; | |
453 | ||
cc7ec456 ED |
454 | f = (struct rsvp_filter *)*arg; |
455 | if (f) { | |
1da177e4 LT |
456 | /* Node exists: adjust only classid */ |
457 | ||
458 | if (f->handle != handle && handle) | |
459 | goto errout2; | |
27e95a8c IM |
460 | if (tb[TCA_RSVP_CLASSID]) { |
461 | f->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]); | |
1da177e4 LT |
462 | tcf_bind_filter(tp, &f->res, base); |
463 | } | |
464 | ||
465 | tcf_exts_change(tp, &f->exts, &e); | |
466 | return 0; | |
467 | } | |
468 | ||
469 | /* Now more serious part... */ | |
470 | err = -EINVAL; | |
471 | if (handle) | |
472 | goto errout2; | |
27e95a8c | 473 | if (tb[TCA_RSVP_DST] == NULL) |
1da177e4 LT |
474 | goto errout2; |
475 | ||
476 | err = -ENOBUFS; | |
0da974f4 | 477 | f = kzalloc(sizeof(struct rsvp_filter), GFP_KERNEL); |
1da177e4 LT |
478 | if (f == NULL) |
479 | goto errout2; | |
480 | ||
5da57f42 | 481 | tcf_exts_init(&f->exts, TCA_RSVP_ACT, TCA_RSVP_POLICE); |
1da177e4 | 482 | h2 = 16; |
27e95a8c IM |
483 | if (tb[TCA_RSVP_SRC]) { |
484 | memcpy(f->src, nla_data(tb[TCA_RSVP_SRC]), sizeof(f->src)); | |
1da177e4 LT |
485 | h2 = hash_src(f->src); |
486 | } | |
27e95a8c IM |
487 | if (tb[TCA_RSVP_PINFO]) { |
488 | pinfo = nla_data(tb[TCA_RSVP_PINFO]); | |
1da177e4 LT |
489 | f->spi = pinfo->spi; |
490 | f->tunnelhdr = pinfo->tunnelhdr; | |
491 | } | |
27e95a8c IM |
492 | if (tb[TCA_RSVP_CLASSID]) |
493 | f->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]); | |
1da177e4 | 494 | |
27e95a8c | 495 | dst = nla_data(tb[TCA_RSVP_DST]); |
1da177e4 LT |
496 | h1 = hash_dst(dst, pinfo ? pinfo->protocol : 0, pinfo ? pinfo->tunnelid : 0); |
497 | ||
498 | err = -ENOMEM; | |
499 | if ((f->handle = gen_handle(tp, h1 | (h2<<8))) == 0) | |
500 | goto errout; | |
501 | ||
502 | if (f->tunnelhdr) { | |
503 | err = -EINVAL; | |
504 | if (f->res.classid > 255) | |
505 | goto errout; | |
506 | ||
507 | err = -ENOMEM; | |
508 | if (f->res.classid == 0 && | |
509 | (f->res.classid = gen_tunnel(data)) == 0) | |
510 | goto errout; | |
511 | } | |
512 | ||
b929d86d JF |
513 | for (sp = &data->ht[h1]; |
514 | (s = rtnl_dereference(*sp)) != NULL; | |
515 | sp = &s->next) { | |
1da177e4 LT |
516 | if (dst[RSVP_DST_LEN-1] == s->dst[RSVP_DST_LEN-1] && |
517 | pinfo && pinfo->protocol == s->protocol && | |
f64f9e71 | 518 | memcmp(&pinfo->dpi, &s->dpi, sizeof(s->dpi)) == 0 && |
1da177e4 | 519 | #if RSVP_DST_LEN == 4 |
f64f9e71 JP |
520 | dst[0] == s->dst[0] && |
521 | dst[1] == s->dst[1] && | |
522 | dst[2] == s->dst[2] && | |
1da177e4 | 523 | #endif |
f64f9e71 | 524 | pinfo->tunnelid == s->tunnelid) { |
1da177e4 LT |
525 | |
526 | insert: | |
527 | /* OK, we found appropriate session */ | |
528 | ||
529 | fp = &s->ht[h2]; | |
530 | ||
531 | f->sess = s; | |
532 | if (f->tunnelhdr == 0) | |
533 | tcf_bind_filter(tp, &f->res, base); | |
534 | ||
535 | tcf_exts_change(tp, &f->exts, &e); | |
536 | ||
b929d86d JF |
537 | fp = &s->ht[h2]; |
538 | for (nfp = rtnl_dereference(*fp); nfp; | |
539 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) { | |
540 | __u32 mask = nfp->spi.mask & f->spi.mask; | |
541 | ||
542 | if (mask != f->spi.mask) | |
1da177e4 | 543 | break; |
b929d86d JF |
544 | } |
545 | RCU_INIT_POINTER(f->next, nfp); | |
546 | rcu_assign_pointer(*fp, f); | |
1da177e4 LT |
547 | |
548 | *arg = (unsigned long)f; | |
549 | return 0; | |
550 | } | |
551 | } | |
552 | ||
553 | /* No session found. Create new one. */ | |
554 | ||
555 | err = -ENOBUFS; | |
0da974f4 | 556 | s = kzalloc(sizeof(struct rsvp_session), GFP_KERNEL); |
1da177e4 LT |
557 | if (s == NULL) |
558 | goto errout; | |
1da177e4 LT |
559 | memcpy(s->dst, dst, sizeof(s->dst)); |
560 | ||
561 | if (pinfo) { | |
562 | s->dpi = pinfo->dpi; | |
563 | s->protocol = pinfo->protocol; | |
564 | s->tunnelid = pinfo->tunnelid; | |
565 | } | |
b929d86d JF |
566 | sp = &data->ht[h1]; |
567 | for (nsp = rtnl_dereference(*sp); nsp; | |
568 | sp = &nsp->next, nsp = rtnl_dereference(*sp)) { | |
569 | if ((nsp->dpi.mask & s->dpi.mask) != s->dpi.mask) | |
1da177e4 LT |
570 | break; |
571 | } | |
b929d86d JF |
572 | RCU_INIT_POINTER(s->next, nsp); |
573 | rcu_assign_pointer(*sp, s); | |
10297b99 | 574 | |
1da177e4 LT |
575 | goto insert; |
576 | ||
577 | errout: | |
a51482bd | 578 | kfree(f); |
1da177e4 LT |
579 | errout2: |
580 | tcf_exts_destroy(tp, &e); | |
581 | return err; | |
582 | } | |
583 | ||
584 | static void rsvp_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
585 | { | |
b929d86d | 586 | struct rsvp_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 587 | unsigned int h, h1; |
1da177e4 LT |
588 | |
589 | if (arg->stop) | |
590 | return; | |
591 | ||
592 | for (h = 0; h < 256; h++) { | |
593 | struct rsvp_session *s; | |
594 | ||
b929d86d JF |
595 | for (s = rtnl_dereference(head->ht[h]); s; |
596 | s = rtnl_dereference(s->next)) { | |
1da177e4 LT |
597 | for (h1 = 0; h1 <= 16; h1++) { |
598 | struct rsvp_filter *f; | |
599 | ||
b929d86d JF |
600 | for (f = rtnl_dereference(s->ht[h1]); f; |
601 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
602 | if (arg->count < arg->skip) { |
603 | arg->count++; | |
604 | continue; | |
605 | } | |
606 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
607 | arg->stop = 1; | |
608 | return; | |
609 | } | |
610 | arg->count++; | |
611 | } | |
612 | } | |
613 | } | |
614 | } | |
615 | } | |
616 | ||
832d1d5b | 617 | static int rsvp_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
618 | struct sk_buff *skb, struct tcmsg *t) |
619 | { | |
cc7ec456 | 620 | struct rsvp_filter *f = (struct rsvp_filter *)fh; |
1da177e4 | 621 | struct rsvp_session *s; |
27a884dc | 622 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 623 | struct nlattr *nest; |
1da177e4 LT |
624 | struct tc_rsvp_pinfo pinfo; |
625 | ||
626 | if (f == NULL) | |
627 | return skb->len; | |
628 | s = f->sess; | |
629 | ||
630 | t->tcm_handle = f->handle; | |
631 | ||
4b3550ef PM |
632 | nest = nla_nest_start(skb, TCA_OPTIONS); |
633 | if (nest == NULL) | |
634 | goto nla_put_failure; | |
1da177e4 | 635 | |
1b34ec43 DM |
636 | if (nla_put(skb, TCA_RSVP_DST, sizeof(s->dst), &s->dst)) |
637 | goto nla_put_failure; | |
1da177e4 LT |
638 | pinfo.dpi = s->dpi; |
639 | pinfo.spi = f->spi; | |
640 | pinfo.protocol = s->protocol; | |
641 | pinfo.tunnelid = s->tunnelid; | |
642 | pinfo.tunnelhdr = f->tunnelhdr; | |
8a47077a | 643 | pinfo.pad = 0; |
1b34ec43 DM |
644 | if (nla_put(skb, TCA_RSVP_PINFO, sizeof(pinfo), &pinfo)) |
645 | goto nla_put_failure; | |
646 | if (f->res.classid && | |
647 | nla_put_u32(skb, TCA_RSVP_CLASSID, f->res.classid)) | |
648 | goto nla_put_failure; | |
649 | if (((f->handle >> 8) & 0xFF) != 16 && | |
650 | nla_put(skb, TCA_RSVP_SRC, sizeof(f->src), f->src)) | |
651 | goto nla_put_failure; | |
1da177e4 | 652 | |
5da57f42 | 653 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 654 | goto nla_put_failure; |
1da177e4 | 655 | |
4b3550ef | 656 | nla_nest_end(skb, nest); |
1da177e4 | 657 | |
5da57f42 | 658 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 659 | goto nla_put_failure; |
1da177e4 LT |
660 | return skb->len; |
661 | ||
add93b61 | 662 | nla_put_failure: |
dc5fc579 | 663 | nlmsg_trim(skb, b); |
1da177e4 LT |
664 | return -1; |
665 | } | |
666 | ||
27e95a8c | 667 | static struct tcf_proto_ops RSVP_OPS __read_mostly = { |
1da177e4 LT |
668 | .kind = RSVP_ID, |
669 | .classify = rsvp_classify, | |
670 | .init = rsvp_init, | |
671 | .destroy = rsvp_destroy, | |
672 | .get = rsvp_get, | |
673 | .put = rsvp_put, | |
674 | .change = rsvp_change, | |
675 | .delete = rsvp_delete, | |
676 | .walk = rsvp_walk, | |
677 | .dump = rsvp_dump, | |
678 | .owner = THIS_MODULE, | |
679 | }; | |
680 | ||
681 | static int __init init_rsvp(void) | |
682 | { | |
683 | return register_tcf_proto_ops(&RSVP_OPS); | |
684 | } | |
685 | ||
10297b99 | 686 | static void __exit exit_rsvp(void) |
1da177e4 LT |
687 | { |
688 | unregister_tcf_proto_ops(&RSVP_OPS); | |
689 | } | |
690 | ||
691 | module_init(init_rsvp) | |
692 | module_exit(exit_rsvp) |