Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/cls_route.c ROUTE4 classifier. | |
4 | * | |
1da177e4 LT |
5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
1da177e4 LT |
10 | #include <linux/types.h> |
11 | #include <linux/kernel.h> | |
1da177e4 | 12 | #include <linux/string.h> |
1da177e4 | 13 | #include <linux/errno.h> |
1da177e4 | 14 | #include <linux/skbuff.h> |
0ba48053 PM |
15 | #include <net/dst.h> |
16 | #include <net/route.h> | |
17 | #include <net/netlink.h> | |
1da177e4 LT |
18 | #include <net/act_api.h> |
19 | #include <net/pkt_cls.h> | |
20 | ||
21 | /* | |
cc7ec456 ED |
22 | * 1. For now we assume that route tags < 256. |
23 | * It allows to use direct table lookups, instead of hash tables. | |
24 | * 2. For now we assume that "from TAG" and "fromdev DEV" statements | |
25 | * are mutually exclusive. | |
26 | * 3. "to TAG from ANY" has higher priority, than "to ANY from XXX" | |
1da177e4 | 27 | */ |
cc7ec456 | 28 | struct route4_fastmap { |
1109c005 JF |
29 | struct route4_filter *filter; |
30 | u32 id; | |
31 | int iif; | |
1da177e4 LT |
32 | }; |
33 | ||
cc7ec456 | 34 | struct route4_head { |
1109c005 JF |
35 | struct route4_fastmap fastmap[16]; |
36 | struct route4_bucket __rcu *table[256 + 1]; | |
37 | struct rcu_head rcu; | |
1da177e4 LT |
38 | }; |
39 | ||
cc7ec456 | 40 | struct route4_bucket { |
1da177e4 | 41 | /* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */ |
1109c005 JF |
42 | struct route4_filter __rcu *ht[16 + 16 + 1]; |
43 | struct rcu_head rcu; | |
1da177e4 LT |
44 | }; |
45 | ||
cc7ec456 | 46 | struct route4_filter { |
1109c005 | 47 | struct route4_filter __rcu *next; |
1da177e4 LT |
48 | u32 id; |
49 | int iif; | |
50 | ||
51 | struct tcf_result res; | |
52 | struct tcf_exts exts; | |
53 | u32 handle; | |
54 | struct route4_bucket *bkt; | |
1109c005 | 55 | struct tcf_proto *tp; |
aaa908ff | 56 | struct rcu_work rwork; |
1da177e4 LT |
57 | }; |
58 | ||
cc7ec456 | 59 | #define ROUTE4_FAILURE ((struct route4_filter *)(-1L)) |
1da177e4 | 60 | |
cc7ec456 | 61 | static inline int route4_fastmap_hash(u32 id, int iif) |
1da177e4 | 62 | { |
cc7ec456 | 63 | return id & 0xF; |
1da177e4 LT |
64 | } |
65 | ||
1109c005 | 66 | static DEFINE_SPINLOCK(fastmap_lock); |
cc7ec456 | 67 | static void |
1109c005 | 68 | route4_reset_fastmap(struct route4_head *head) |
1da177e4 | 69 | { |
1109c005 | 70 | spin_lock_bh(&fastmap_lock); |
1da177e4 | 71 | memset(head->fastmap, 0, sizeof(head->fastmap)); |
1109c005 | 72 | spin_unlock_bh(&fastmap_lock); |
1da177e4 LT |
73 | } |
74 | ||
cc7ec456 | 75 | static void |
1da177e4 LT |
76 | route4_set_fastmap(struct route4_head *head, u32 id, int iif, |
77 | struct route4_filter *f) | |
78 | { | |
79 | int h = route4_fastmap_hash(id, iif); | |
cc7ec456 | 80 | |
1109c005 JF |
81 | /* fastmap updates must look atomic to aling id, iff, filter */ |
82 | spin_lock_bh(&fastmap_lock); | |
1da177e4 LT |
83 | head->fastmap[h].id = id; |
84 | head->fastmap[h].iif = iif; | |
85 | head->fastmap[h].filter = f; | |
1109c005 | 86 | spin_unlock_bh(&fastmap_lock); |
1da177e4 LT |
87 | } |
88 | ||
cc7ec456 | 89 | static inline int route4_hash_to(u32 id) |
1da177e4 | 90 | { |
cc7ec456 | 91 | return id & 0xFF; |
1da177e4 LT |
92 | } |
93 | ||
cc7ec456 | 94 | static inline int route4_hash_from(u32 id) |
1da177e4 | 95 | { |
cc7ec456 | 96 | return (id >> 16) & 0xF; |
1da177e4 LT |
97 | } |
98 | ||
cc7ec456 | 99 | static inline int route4_hash_iif(int iif) |
1da177e4 | 100 | { |
cc7ec456 | 101 | return 16 + ((iif >> 16) & 0xF); |
1da177e4 LT |
102 | } |
103 | ||
cc7ec456 | 104 | static inline int route4_hash_wild(void) |
1da177e4 LT |
105 | { |
106 | return 32; | |
107 | } | |
108 | ||
109 | #define ROUTE4_APPLY_RESULT() \ | |
110 | { \ | |
111 | *res = f->res; \ | |
6fc6d06e | 112 | if (tcf_exts_has_actions(&f->exts)) { \ |
1da177e4 LT |
113 | int r = tcf_exts_exec(skb, &f->exts, res); \ |
114 | if (r < 0) { \ | |
115 | dont_cache = 1; \ | |
116 | continue; \ | |
117 | } \ | |
118 | return r; \ | |
119 | } else if (!dont_cache) \ | |
120 | route4_set_fastmap(head, id, iif, f); \ | |
121 | return 0; \ | |
122 | } | |
123 | ||
dc7f9f6e | 124 | static int route4_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
125 | struct tcf_result *res) |
126 | { | |
1109c005 | 127 | struct route4_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
128 | struct dst_entry *dst; |
129 | struct route4_bucket *b; | |
130 | struct route4_filter *f; | |
131 | u32 id, h; | |
132 | int iif, dont_cache = 0; | |
133 | ||
cc7ec456 ED |
134 | dst = skb_dst(skb); |
135 | if (!dst) | |
1da177e4 LT |
136 | goto failure; |
137 | ||
138 | id = dst->tclassid; | |
1da177e4 | 139 | |
92101b3b | 140 | iif = inet_iif(skb); |
1da177e4 LT |
141 | |
142 | h = route4_fastmap_hash(id, iif); | |
1109c005 JF |
143 | |
144 | spin_lock(&fastmap_lock); | |
1da177e4 LT |
145 | if (id == head->fastmap[h].id && |
146 | iif == head->fastmap[h].iif && | |
147 | (f = head->fastmap[h].filter) != NULL) { | |
1109c005 JF |
148 | if (f == ROUTE4_FAILURE) { |
149 | spin_unlock(&fastmap_lock); | |
1da177e4 | 150 | goto failure; |
1109c005 | 151 | } |
1da177e4 LT |
152 | |
153 | *res = f->res; | |
1109c005 | 154 | spin_unlock(&fastmap_lock); |
1da177e4 LT |
155 | return 0; |
156 | } | |
1109c005 | 157 | spin_unlock(&fastmap_lock); |
1da177e4 LT |
158 | |
159 | h = route4_hash_to(id); | |
160 | ||
161 | restart: | |
1109c005 | 162 | b = rcu_dereference_bh(head->table[h]); |
cc7ec456 | 163 | if (b) { |
1109c005 JF |
164 | for (f = rcu_dereference_bh(b->ht[route4_hash_from(id)]); |
165 | f; | |
166 | f = rcu_dereference_bh(f->next)) | |
1da177e4 LT |
167 | if (f->id == id) |
168 | ROUTE4_APPLY_RESULT(); | |
169 | ||
1109c005 JF |
170 | for (f = rcu_dereference_bh(b->ht[route4_hash_iif(iif)]); |
171 | f; | |
172 | f = rcu_dereference_bh(f->next)) | |
1da177e4 LT |
173 | if (f->iif == iif) |
174 | ROUTE4_APPLY_RESULT(); | |
175 | ||
1109c005 JF |
176 | for (f = rcu_dereference_bh(b->ht[route4_hash_wild()]); |
177 | f; | |
178 | f = rcu_dereference_bh(f->next)) | |
1da177e4 | 179 | ROUTE4_APPLY_RESULT(); |
1da177e4 LT |
180 | } |
181 | if (h < 256) { | |
182 | h = 256; | |
183 | id &= ~0xFFFF; | |
184 | goto restart; | |
185 | } | |
186 | ||
187 | if (!dont_cache) | |
188 | route4_set_fastmap(head, id, iif, ROUTE4_FAILURE); | |
189 | failure: | |
190 | return -1; | |
1da177e4 LT |
191 | } |
192 | ||
193 | static inline u32 to_hash(u32 id) | |
194 | { | |
cc7ec456 ED |
195 | u32 h = id & 0xFF; |
196 | ||
197 | if (id & 0x8000) | |
1da177e4 LT |
198 | h += 256; |
199 | return h; | |
200 | } | |
201 | ||
202 | static inline u32 from_hash(u32 id) | |
203 | { | |
204 | id &= 0xFFFF; | |
205 | if (id == 0xFFFF) | |
206 | return 32; | |
207 | if (!(id & 0x8000)) { | |
208 | if (id > 255) | |
209 | return 256; | |
cc7ec456 | 210 | return id & 0xF; |
1da177e4 | 211 | } |
cc7ec456 | 212 | return 16 + (id & 0xF); |
1da177e4 LT |
213 | } |
214 | ||
8113c095 | 215 | static void *route4_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 216 | { |
1109c005 | 217 | struct route4_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
218 | struct route4_bucket *b; |
219 | struct route4_filter *f; | |
cc7ec456 | 220 | unsigned int h1, h2; |
1da177e4 | 221 | |
1da177e4 LT |
222 | h1 = to_hash(handle); |
223 | if (h1 > 256) | |
8113c095 | 224 | return NULL; |
1da177e4 | 225 | |
cc7ec456 | 226 | h2 = from_hash(handle >> 16); |
1da177e4 | 227 | if (h2 > 32) |
8113c095 | 228 | return NULL; |
1da177e4 | 229 | |
1109c005 | 230 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 | 231 | if (b) { |
1109c005 JF |
232 | for (f = rtnl_dereference(b->ht[h2]); |
233 | f; | |
234 | f = rtnl_dereference(f->next)) | |
1da177e4 | 235 | if (f->handle == handle) |
8113c095 | 236 | return f; |
1da177e4 | 237 | } |
8113c095 | 238 | return NULL; |
1da177e4 LT |
239 | } |
240 | ||
1da177e4 LT |
241 | static int route4_init(struct tcf_proto *tp) |
242 | { | |
a05c2d11 WC |
243 | struct route4_head *head; |
244 | ||
245 | head = kzalloc(sizeof(struct route4_head), GFP_KERNEL); | |
246 | if (head == NULL) | |
247 | return -ENOBUFS; | |
248 | ||
249 | rcu_assign_pointer(tp->root, head); | |
1da177e4 LT |
250 | return 0; |
251 | } | |
252 | ||
3fd51de5 CW |
253 | static void __route4_delete_filter(struct route4_filter *f) |
254 | { | |
255 | tcf_exts_destroy(&f->exts); | |
256 | tcf_exts_put_net(&f->exts); | |
257 | kfree(f); | |
258 | } | |
259 | ||
c2f3f31d | 260 | static void route4_delete_filter_work(struct work_struct *work) |
1da177e4 | 261 | { |
aaa908ff CW |
262 | struct route4_filter *f = container_of(to_rcu_work(work), |
263 | struct route4_filter, | |
264 | rwork); | |
c2f3f31d | 265 | rtnl_lock(); |
3fd51de5 | 266 | __route4_delete_filter(f); |
c2f3f31d CW |
267 | rtnl_unlock(); |
268 | } | |
269 | ||
aaa908ff | 270 | static void route4_queue_work(struct route4_filter *f) |
c2f3f31d | 271 | { |
aaa908ff | 272 | tcf_queue_work(&f->rwork, route4_delete_filter_work); |
1da177e4 LT |
273 | } |
274 | ||
12db03b6 VB |
275 | static void route4_destroy(struct tcf_proto *tp, bool rtnl_held, |
276 | struct netlink_ext_ack *extack) | |
1da177e4 | 277 | { |
1109c005 | 278 | struct route4_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
279 | int h1, h2; |
280 | ||
281 | if (head == NULL) | |
763dbf63 | 282 | return; |
1da177e4 | 283 | |
cc7ec456 | 284 | for (h1 = 0; h1 <= 256; h1++) { |
1da177e4 LT |
285 | struct route4_bucket *b; |
286 | ||
1109c005 | 287 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 ED |
288 | if (b) { |
289 | for (h2 = 0; h2 <= 32; h2++) { | |
1da177e4 LT |
290 | struct route4_filter *f; |
291 | ||
1109c005 JF |
292 | while ((f = rtnl_dereference(b->ht[h2])) != NULL) { |
293 | struct route4_filter *next; | |
294 | ||
295 | next = rtnl_dereference(f->next); | |
296 | RCU_INIT_POINTER(b->ht[h2], next); | |
18cdb37e | 297 | tcf_unbind_filter(tp, &f->res); |
3fd51de5 | 298 | if (tcf_exts_get_net(&f->exts)) |
aaa908ff | 299 | route4_queue_work(f); |
3fd51de5 CW |
300 | else |
301 | __route4_delete_filter(f); | |
1da177e4 LT |
302 | } |
303 | } | |
1109c005 JF |
304 | RCU_INIT_POINTER(head->table[h1], NULL); |
305 | kfree_rcu(b, rcu); | |
1da177e4 LT |
306 | } |
307 | } | |
1109c005 | 308 | kfree_rcu(head, rcu); |
1da177e4 LT |
309 | } |
310 | ||
571acf21 | 311 | static int route4_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 312 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 313 | { |
1109c005 | 314 | struct route4_head *head = rtnl_dereference(tp->root); |
8113c095 | 315 | struct route4_filter *f = arg; |
1109c005 JF |
316 | struct route4_filter __rcu **fp; |
317 | struct route4_filter *nf; | |
1da177e4 | 318 | struct route4_bucket *b; |
1109c005 | 319 | unsigned int h = 0; |
763dbf63 | 320 | int i, h1; |
1da177e4 LT |
321 | |
322 | if (!head || !f) | |
323 | return -EINVAL; | |
324 | ||
325 | h = f->handle; | |
326 | b = f->bkt; | |
327 | ||
1109c005 JF |
328 | fp = &b->ht[from_hash(h >> 16)]; |
329 | for (nf = rtnl_dereference(*fp); nf; | |
330 | fp = &nf->next, nf = rtnl_dereference(*fp)) { | |
331 | if (nf == f) { | |
332 | /* unlink it */ | |
333 | RCU_INIT_POINTER(*fp, rtnl_dereference(f->next)); | |
1da177e4 | 334 | |
1109c005 JF |
335 | /* Remove any fastmap lookups that might ref filter |
336 | * notice we unlink'd the filter so we can't get it | |
337 | * back in the fastmap. | |
338 | */ | |
339 | route4_reset_fastmap(head); | |
1da177e4 | 340 | |
1109c005 | 341 | /* Delete it */ |
18cdb37e | 342 | tcf_unbind_filter(tp, &f->res); |
3fd51de5 | 343 | tcf_exts_get_net(&f->exts); |
aaa908ff | 344 | tcf_queue_work(&f->rwork, route4_delete_filter_work); |
1da177e4 | 345 | |
1109c005 JF |
346 | /* Strip RTNL protected tree */ |
347 | for (i = 0; i <= 32; i++) { | |
348 | struct route4_filter *rt; | |
349 | ||
350 | rt = rtnl_dereference(b->ht[i]); | |
351 | if (rt) | |
763dbf63 | 352 | goto out; |
1109c005 | 353 | } |
1da177e4 LT |
354 | |
355 | /* OK, session has no flows */ | |
1109c005 JF |
356 | RCU_INIT_POINTER(head->table[to_hash(h)], NULL); |
357 | kfree_rcu(b, rcu); | |
763dbf63 WC |
358 | break; |
359 | } | |
360 | } | |
1da177e4 | 361 | |
763dbf63 WC |
362 | out: |
363 | *last = true; | |
364 | for (h1 = 0; h1 <= 256; h1++) { | |
365 | if (rcu_access_pointer(head->table[h1])) { | |
366 | *last = false; | |
367 | break; | |
1da177e4 LT |
368 | } |
369 | } | |
763dbf63 | 370 | |
1da177e4 LT |
371 | return 0; |
372 | } | |
373 | ||
6fa8c014 PM |
374 | static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = { |
375 | [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 }, | |
376 | [TCA_ROUTE4_TO] = { .type = NLA_U32 }, | |
377 | [TCA_ROUTE4_FROM] = { .type = NLA_U32 }, | |
378 | [TCA_ROUTE4_IIF] = { .type = NLA_U32 }, | |
379 | }; | |
380 | ||
c1b52739 BL |
381 | static int route4_set_parms(struct net *net, struct tcf_proto *tp, |
382 | unsigned long base, struct route4_filter *f, | |
383 | u32 handle, struct route4_head *head, | |
2f7ef2f8 | 384 | struct nlattr **tb, struct nlattr *est, int new, |
50a56190 | 385 | bool ovr, struct netlink_ext_ack *extack) |
1da177e4 | 386 | { |
1da177e4 LT |
387 | u32 id = 0, to = 0, nhandle = 0x8000; |
388 | struct route4_filter *fp; | |
389 | unsigned int h1; | |
390 | struct route4_bucket *b; | |
b9a24bb7 | 391 | int err; |
1da177e4 | 392 | |
ec6743a1 | 393 | err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, true, extack); |
1da177e4 LT |
394 | if (err < 0) |
395 | return err; | |
396 | ||
add93b61 | 397 | if (tb[TCA_ROUTE4_TO]) { |
1da177e4 | 398 | if (new && handle & 0x8000) |
8c98d571 | 399 | return -EINVAL; |
1587bac4 | 400 | to = nla_get_u32(tb[TCA_ROUTE4_TO]); |
1da177e4 | 401 | if (to > 0xFF) |
8c98d571 | 402 | return -EINVAL; |
1da177e4 LT |
403 | nhandle = to; |
404 | } | |
405 | ||
add93b61 PM |
406 | if (tb[TCA_ROUTE4_FROM]) { |
407 | if (tb[TCA_ROUTE4_IIF]) | |
8c98d571 | 408 | return -EINVAL; |
1587bac4 | 409 | id = nla_get_u32(tb[TCA_ROUTE4_FROM]); |
1da177e4 | 410 | if (id > 0xFF) |
8c98d571 | 411 | return -EINVAL; |
1da177e4 | 412 | nhandle |= id << 16; |
add93b61 | 413 | } else if (tb[TCA_ROUTE4_IIF]) { |
1587bac4 | 414 | id = nla_get_u32(tb[TCA_ROUTE4_IIF]); |
1da177e4 | 415 | if (id > 0x7FFF) |
8c98d571 | 416 | return -EINVAL; |
1da177e4 LT |
417 | nhandle |= (id | 0x8000) << 16; |
418 | } else | |
419 | nhandle |= 0xFFFF << 16; | |
420 | ||
421 | if (handle && new) { | |
422 | nhandle |= handle & 0x7F00; | |
423 | if (nhandle != handle) | |
8c98d571 | 424 | return -EINVAL; |
1da177e4 LT |
425 | } |
426 | ||
427 | h1 = to_hash(nhandle); | |
1109c005 | 428 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 | 429 | if (!b) { |
0da974f4 | 430 | b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL); |
1da177e4 | 431 | if (b == NULL) |
8c98d571 | 432 | return -ENOBUFS; |
1da177e4 | 433 | |
1109c005 | 434 | rcu_assign_pointer(head->table[h1], b); |
1da177e4 LT |
435 | } else { |
436 | unsigned int h2 = from_hash(nhandle >> 16); | |
cc7ec456 | 437 | |
1109c005 JF |
438 | for (fp = rtnl_dereference(b->ht[h2]); |
439 | fp; | |
440 | fp = rtnl_dereference(fp->next)) | |
1da177e4 | 441 | if (fp->handle == f->handle) |
8c98d571 | 442 | return -EEXIST; |
1da177e4 LT |
443 | } |
444 | ||
add93b61 | 445 | if (tb[TCA_ROUTE4_TO]) |
1da177e4 LT |
446 | f->id = to; |
447 | ||
add93b61 | 448 | if (tb[TCA_ROUTE4_FROM]) |
1da177e4 | 449 | f->id = to | id<<16; |
add93b61 | 450 | else if (tb[TCA_ROUTE4_IIF]) |
1da177e4 LT |
451 | f->iif = id; |
452 | ||
453 | f->handle = nhandle; | |
454 | f->bkt = b; | |
1109c005 | 455 | f->tp = tp; |
1da177e4 | 456 | |
add93b61 | 457 | if (tb[TCA_ROUTE4_CLASSID]) { |
1587bac4 | 458 | f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]); |
1da177e4 LT |
459 | tcf_bind_filter(tp, &f->res, base); |
460 | } | |
461 | ||
1da177e4 | 462 | return 0; |
1da177e4 LT |
463 | } |
464 | ||
c1b52739 | 465 | static int route4_change(struct net *net, struct sk_buff *in_skb, |
5a7a5555 | 466 | struct tcf_proto *tp, unsigned long base, u32 handle, |
7306db38 | 467 | struct nlattr **tca, void **arg, bool ovr, |
12db03b6 | 468 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 469 | { |
1109c005 JF |
470 | struct route4_head *head = rtnl_dereference(tp->root); |
471 | struct route4_filter __rcu **fp; | |
472 | struct route4_filter *fold, *f1, *pfp, *f = NULL; | |
1da177e4 | 473 | struct route4_bucket *b; |
add93b61 PM |
474 | struct nlattr *opt = tca[TCA_OPTIONS]; |
475 | struct nlattr *tb[TCA_ROUTE4_MAX + 1]; | |
1da177e4 | 476 | unsigned int h, th; |
1da177e4 | 477 | int err; |
1109c005 | 478 | bool new = true; |
1da177e4 LT |
479 | |
480 | if (opt == NULL) | |
481 | return handle ? -EINVAL : 0; | |
482 | ||
8cb08174 JB |
483 | err = nla_parse_nested_deprecated(tb, TCA_ROUTE4_MAX, opt, |
484 | route4_policy, NULL); | |
cee63723 PM |
485 | if (err < 0) |
486 | return err; | |
1da177e4 | 487 | |
8113c095 | 488 | fold = *arg; |
1109c005 | 489 | if (fold && handle && fold->handle != handle) |
1da177e4 LT |
490 | return -EINVAL; |
491 | ||
1da177e4 | 492 | err = -ENOBUFS; |
0da974f4 | 493 | f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL); |
1109c005 | 494 | if (!f) |
1da177e4 | 495 | goto errout; |
1da177e4 | 496 | |
14215108 | 497 | err = tcf_exts_init(&f->exts, net, TCA_ROUTE4_ACT, TCA_ROUTE4_POLICE); |
b9a24bb7 WC |
498 | if (err < 0) |
499 | goto errout; | |
500 | ||
1109c005 JF |
501 | if (fold) { |
502 | f->id = fold->id; | |
503 | f->iif = fold->iif; | |
504 | f->res = fold->res; | |
505 | f->handle = fold->handle; | |
506 | ||
507 | f->tp = fold->tp; | |
508 | f->bkt = fold->bkt; | |
509 | new = false; | |
510 | } | |
511 | ||
c1b52739 | 512 | err = route4_set_parms(net, tp, base, f, handle, head, tb, |
50a56190 | 513 | tca[TCA_RATE], new, ovr, extack); |
1da177e4 LT |
514 | if (err < 0) |
515 | goto errout; | |
516 | ||
1da177e4 | 517 | h = from_hash(f->handle >> 16); |
1109c005 JF |
518 | fp = &f->bkt->ht[h]; |
519 | for (pfp = rtnl_dereference(*fp); | |
520 | (f1 = rtnl_dereference(*fp)) != NULL; | |
521 | fp = &f1->next) | |
1da177e4 LT |
522 | if (f->handle < f1->handle) |
523 | break; | |
524 | ||
f36fe1c4 | 525 | tcf_block_netif_keep_dst(tp->chain->block); |
1109c005 JF |
526 | rcu_assign_pointer(f->next, f1); |
527 | rcu_assign_pointer(*fp, f); | |
1da177e4 | 528 | |
1109c005 JF |
529 | if (fold && fold->handle && f->handle != fold->handle) { |
530 | th = to_hash(fold->handle); | |
531 | h = from_hash(fold->handle >> 16); | |
532 | b = rtnl_dereference(head->table[th]); | |
cc7ec456 | 533 | if (b) { |
1109c005 JF |
534 | fp = &b->ht[h]; |
535 | for (pfp = rtnl_dereference(*fp); pfp; | |
536 | fp = &pfp->next, pfp = rtnl_dereference(*fp)) { | |
537 | if (pfp == f) { | |
1da177e4 LT |
538 | *fp = f->next; |
539 | break; | |
540 | } | |
541 | } | |
542 | } | |
543 | } | |
1da177e4 | 544 | |
1109c005 | 545 | route4_reset_fastmap(head); |
8113c095 | 546 | *arg = f; |
18cdb37e JF |
547 | if (fold) { |
548 | tcf_unbind_filter(tp, &fold->res); | |
3fd51de5 | 549 | tcf_exts_get_net(&fold->exts); |
aaa908ff | 550 | tcf_queue_work(&fold->rwork, route4_delete_filter_work); |
18cdb37e | 551 | } |
1da177e4 LT |
552 | return 0; |
553 | ||
554 | errout: | |
21641c2e WC |
555 | if (f) |
556 | tcf_exts_destroy(&f->exts); | |
a51482bd | 557 | kfree(f); |
1da177e4 LT |
558 | return err; |
559 | } | |
560 | ||
12db03b6 VB |
561 | static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
562 | bool rtnl_held) | |
1da177e4 | 563 | { |
1109c005 | 564 | struct route4_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 565 | unsigned int h, h1; |
1da177e4 | 566 | |
3027ff41 | 567 | if (head == NULL || arg->stop) |
1da177e4 LT |
568 | return; |
569 | ||
570 | for (h = 0; h <= 256; h++) { | |
1109c005 | 571 | struct route4_bucket *b = rtnl_dereference(head->table[h]); |
1da177e4 LT |
572 | |
573 | if (b) { | |
574 | for (h1 = 0; h1 <= 32; h1++) { | |
575 | struct route4_filter *f; | |
576 | ||
1109c005 JF |
577 | for (f = rtnl_dereference(b->ht[h1]); |
578 | f; | |
579 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
580 | if (arg->count < arg->skip) { |
581 | arg->count++; | |
582 | continue; | |
583 | } | |
8113c095 | 584 | if (arg->fn(tp, f, arg) < 0) { |
1da177e4 LT |
585 | arg->stop = 1; |
586 | return; | |
587 | } | |
588 | arg->count++; | |
589 | } | |
590 | } | |
591 | } | |
592 | } | |
593 | } | |
594 | ||
8113c095 | 595 | static int route4_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 596 | struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
1da177e4 | 597 | { |
8113c095 | 598 | struct route4_filter *f = fh; |
4b3550ef | 599 | struct nlattr *nest; |
1da177e4 LT |
600 | u32 id; |
601 | ||
602 | if (f == NULL) | |
603 | return skb->len; | |
604 | ||
605 | t->tcm_handle = f->handle; | |
606 | ||
ae0be8de | 607 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
4b3550ef PM |
608 | if (nest == NULL) |
609 | goto nla_put_failure; | |
1da177e4 | 610 | |
cc7ec456 ED |
611 | if (!(f->handle & 0x8000)) { |
612 | id = f->id & 0xFF; | |
1b34ec43 DM |
613 | if (nla_put_u32(skb, TCA_ROUTE4_TO, id)) |
614 | goto nla_put_failure; | |
1da177e4 | 615 | } |
cc7ec456 | 616 | if (f->handle & 0x80000000) { |
1b34ec43 DM |
617 | if ((f->handle >> 16) != 0xFFFF && |
618 | nla_put_u32(skb, TCA_ROUTE4_IIF, f->iif)) | |
619 | goto nla_put_failure; | |
1da177e4 | 620 | } else { |
cc7ec456 | 621 | id = f->id >> 16; |
1b34ec43 DM |
622 | if (nla_put_u32(skb, TCA_ROUTE4_FROM, id)) |
623 | goto nla_put_failure; | |
1da177e4 | 624 | } |
1b34ec43 DM |
625 | if (f->res.classid && |
626 | nla_put_u32(skb, TCA_ROUTE4_CLASSID, f->res.classid)) | |
627 | goto nla_put_failure; | |
1da177e4 | 628 | |
5da57f42 | 629 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 630 | goto nla_put_failure; |
1da177e4 | 631 | |
4b3550ef | 632 | nla_nest_end(skb, nest); |
1da177e4 | 633 | |
5da57f42 | 634 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 635 | goto nla_put_failure; |
1da177e4 LT |
636 | |
637 | return skb->len; | |
638 | ||
add93b61 | 639 | nla_put_failure: |
6ea3b446 | 640 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
641 | return -1; |
642 | } | |
643 | ||
2e24cd75 CW |
644 | static void route4_bind_class(void *fh, u32 classid, unsigned long cl, void *q, |
645 | unsigned long base) | |
07d79fc7 CW |
646 | { |
647 | struct route4_filter *f = fh; | |
648 | ||
2e24cd75 CW |
649 | if (f && f->res.classid == classid) { |
650 | if (cl) | |
651 | __tcf_bind_filter(q, &f->res, base); | |
652 | else | |
653 | __tcf_unbind_filter(q, &f->res); | |
654 | } | |
07d79fc7 CW |
655 | } |
656 | ||
2eb9d75c | 657 | static struct tcf_proto_ops cls_route4_ops __read_mostly = { |
1da177e4 LT |
658 | .kind = "route", |
659 | .classify = route4_classify, | |
660 | .init = route4_init, | |
661 | .destroy = route4_destroy, | |
662 | .get = route4_get, | |
1da177e4 LT |
663 | .change = route4_change, |
664 | .delete = route4_delete, | |
665 | .walk = route4_walk, | |
666 | .dump = route4_dump, | |
07d79fc7 | 667 | .bind_class = route4_bind_class, |
1da177e4 LT |
668 | .owner = THIS_MODULE, |
669 | }; | |
670 | ||
671 | static int __init init_route4(void) | |
672 | { | |
673 | return register_tcf_proto_ops(&cls_route4_ops); | |
674 | } | |
675 | ||
676 | static void __exit exit_route4(void) | |
677 | { | |
678 | unregister_tcf_proto_ops(&cls_route4_ops); | |
679 | } | |
680 | ||
681 | module_init(init_route4) | |
682 | module_exit(exit_route4) | |
683 | MODULE_LICENSE("GPL"); |