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> | |
9f3101dc | 20 | #include <net/tc_wrapper.h> |
1da177e4 LT |
21 | |
22 | /* | |
cc7ec456 ED |
23 | * 1. For now we assume that route tags < 256. |
24 | * It allows to use direct table lookups, instead of hash tables. | |
25 | * 2. For now we assume that "from TAG" and "fromdev DEV" statements | |
26 | * are mutually exclusive. | |
27 | * 3. "to TAG from ANY" has higher priority, than "to ANY from XXX" | |
1da177e4 | 28 | */ |
cc7ec456 | 29 | struct route4_fastmap { |
1109c005 JF |
30 | struct route4_filter *filter; |
31 | u32 id; | |
32 | int iif; | |
1da177e4 LT |
33 | }; |
34 | ||
cc7ec456 | 35 | struct route4_head { |
1109c005 JF |
36 | struct route4_fastmap fastmap[16]; |
37 | struct route4_bucket __rcu *table[256 + 1]; | |
38 | struct rcu_head rcu; | |
1da177e4 LT |
39 | }; |
40 | ||
cc7ec456 | 41 | struct route4_bucket { |
1da177e4 | 42 | /* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */ |
1109c005 JF |
43 | struct route4_filter __rcu *ht[16 + 16 + 1]; |
44 | struct rcu_head rcu; | |
1da177e4 LT |
45 | }; |
46 | ||
cc7ec456 | 47 | struct route4_filter { |
1109c005 | 48 | struct route4_filter __rcu *next; |
1da177e4 LT |
49 | u32 id; |
50 | int iif; | |
51 | ||
52 | struct tcf_result res; | |
53 | struct tcf_exts exts; | |
54 | u32 handle; | |
55 | struct route4_bucket *bkt; | |
1109c005 | 56 | struct tcf_proto *tp; |
aaa908ff | 57 | struct rcu_work rwork; |
1da177e4 LT |
58 | }; |
59 | ||
cc7ec456 | 60 | #define ROUTE4_FAILURE ((struct route4_filter *)(-1L)) |
1da177e4 | 61 | |
cc7ec456 | 62 | static inline int route4_fastmap_hash(u32 id, int iif) |
1da177e4 | 63 | { |
cc7ec456 | 64 | return id & 0xF; |
1da177e4 LT |
65 | } |
66 | ||
1109c005 | 67 | static DEFINE_SPINLOCK(fastmap_lock); |
cc7ec456 | 68 | static void |
1109c005 | 69 | route4_reset_fastmap(struct route4_head *head) |
1da177e4 | 70 | { |
1109c005 | 71 | spin_lock_bh(&fastmap_lock); |
1da177e4 | 72 | memset(head->fastmap, 0, sizeof(head->fastmap)); |
1109c005 | 73 | spin_unlock_bh(&fastmap_lock); |
1da177e4 LT |
74 | } |
75 | ||
cc7ec456 | 76 | static void |
1da177e4 LT |
77 | route4_set_fastmap(struct route4_head *head, u32 id, int iif, |
78 | struct route4_filter *f) | |
79 | { | |
80 | int h = route4_fastmap_hash(id, iif); | |
cc7ec456 | 81 | |
1109c005 JF |
82 | /* fastmap updates must look atomic to aling id, iff, filter */ |
83 | spin_lock_bh(&fastmap_lock); | |
1da177e4 LT |
84 | head->fastmap[h].id = id; |
85 | head->fastmap[h].iif = iif; | |
86 | head->fastmap[h].filter = f; | |
1109c005 | 87 | spin_unlock_bh(&fastmap_lock); |
1da177e4 LT |
88 | } |
89 | ||
cc7ec456 | 90 | static inline int route4_hash_to(u32 id) |
1da177e4 | 91 | { |
cc7ec456 | 92 | return id & 0xFF; |
1da177e4 LT |
93 | } |
94 | ||
cc7ec456 | 95 | static inline int route4_hash_from(u32 id) |
1da177e4 | 96 | { |
cc7ec456 | 97 | return (id >> 16) & 0xF; |
1da177e4 LT |
98 | } |
99 | ||
cc7ec456 | 100 | static inline int route4_hash_iif(int iif) |
1da177e4 | 101 | { |
cc7ec456 | 102 | return 16 + ((iif >> 16) & 0xF); |
1da177e4 LT |
103 | } |
104 | ||
cc7ec456 | 105 | static inline int route4_hash_wild(void) |
1da177e4 LT |
106 | { |
107 | return 32; | |
108 | } | |
109 | ||
110 | #define ROUTE4_APPLY_RESULT() \ | |
111 | { \ | |
112 | *res = f->res; \ | |
6fc6d06e | 113 | if (tcf_exts_has_actions(&f->exts)) { \ |
1da177e4 LT |
114 | int r = tcf_exts_exec(skb, &f->exts, res); \ |
115 | if (r < 0) { \ | |
116 | dont_cache = 1; \ | |
117 | continue; \ | |
118 | } \ | |
119 | return r; \ | |
120 | } else if (!dont_cache) \ | |
121 | route4_set_fastmap(head, id, iif, f); \ | |
122 | return 0; \ | |
123 | } | |
124 | ||
9f3101dc PT |
125 | TC_INDIRECT_SCOPE int route4_classify(struct sk_buff *skb, |
126 | const struct tcf_proto *tp, | |
127 | struct tcf_result *res) | |
1da177e4 | 128 | { |
1109c005 | 129 | struct route4_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
130 | struct dst_entry *dst; |
131 | struct route4_bucket *b; | |
132 | struct route4_filter *f; | |
133 | u32 id, h; | |
134 | int iif, dont_cache = 0; | |
135 | ||
cc7ec456 ED |
136 | dst = skb_dst(skb); |
137 | if (!dst) | |
1da177e4 LT |
138 | goto failure; |
139 | ||
140 | id = dst->tclassid; | |
1da177e4 | 141 | |
92101b3b | 142 | iif = inet_iif(skb); |
1da177e4 LT |
143 | |
144 | h = route4_fastmap_hash(id, iif); | |
1109c005 JF |
145 | |
146 | spin_lock(&fastmap_lock); | |
1da177e4 LT |
147 | if (id == head->fastmap[h].id && |
148 | iif == head->fastmap[h].iif && | |
149 | (f = head->fastmap[h].filter) != NULL) { | |
1109c005 JF |
150 | if (f == ROUTE4_FAILURE) { |
151 | spin_unlock(&fastmap_lock); | |
1da177e4 | 152 | goto failure; |
1109c005 | 153 | } |
1da177e4 LT |
154 | |
155 | *res = f->res; | |
1109c005 | 156 | spin_unlock(&fastmap_lock); |
1da177e4 LT |
157 | return 0; |
158 | } | |
1109c005 | 159 | spin_unlock(&fastmap_lock); |
1da177e4 LT |
160 | |
161 | h = route4_hash_to(id); | |
162 | ||
163 | restart: | |
1109c005 | 164 | b = rcu_dereference_bh(head->table[h]); |
cc7ec456 | 165 | if (b) { |
1109c005 JF |
166 | for (f = rcu_dereference_bh(b->ht[route4_hash_from(id)]); |
167 | f; | |
168 | f = rcu_dereference_bh(f->next)) | |
1da177e4 LT |
169 | if (f->id == id) |
170 | ROUTE4_APPLY_RESULT(); | |
171 | ||
1109c005 JF |
172 | for (f = rcu_dereference_bh(b->ht[route4_hash_iif(iif)]); |
173 | f; | |
174 | f = rcu_dereference_bh(f->next)) | |
1da177e4 LT |
175 | if (f->iif == iif) |
176 | ROUTE4_APPLY_RESULT(); | |
177 | ||
1109c005 JF |
178 | for (f = rcu_dereference_bh(b->ht[route4_hash_wild()]); |
179 | f; | |
180 | f = rcu_dereference_bh(f->next)) | |
1da177e4 | 181 | ROUTE4_APPLY_RESULT(); |
1da177e4 LT |
182 | } |
183 | if (h < 256) { | |
184 | h = 256; | |
185 | id &= ~0xFFFF; | |
186 | goto restart; | |
187 | } | |
188 | ||
189 | if (!dont_cache) | |
190 | route4_set_fastmap(head, id, iif, ROUTE4_FAILURE); | |
191 | failure: | |
192 | return -1; | |
1da177e4 LT |
193 | } |
194 | ||
195 | static inline u32 to_hash(u32 id) | |
196 | { | |
cc7ec456 ED |
197 | u32 h = id & 0xFF; |
198 | ||
199 | if (id & 0x8000) | |
1da177e4 LT |
200 | h += 256; |
201 | return h; | |
202 | } | |
203 | ||
204 | static inline u32 from_hash(u32 id) | |
205 | { | |
206 | id &= 0xFFFF; | |
207 | if (id == 0xFFFF) | |
208 | return 32; | |
209 | if (!(id & 0x8000)) { | |
210 | if (id > 255) | |
211 | return 256; | |
cc7ec456 | 212 | return id & 0xF; |
1da177e4 | 213 | } |
cc7ec456 | 214 | return 16 + (id & 0xF); |
1da177e4 LT |
215 | } |
216 | ||
8113c095 | 217 | static void *route4_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 218 | { |
1109c005 | 219 | struct route4_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
220 | struct route4_bucket *b; |
221 | struct route4_filter *f; | |
cc7ec456 | 222 | unsigned int h1, h2; |
1da177e4 | 223 | |
1da177e4 LT |
224 | h1 = to_hash(handle); |
225 | if (h1 > 256) | |
8113c095 | 226 | return NULL; |
1da177e4 | 227 | |
cc7ec456 | 228 | h2 = from_hash(handle >> 16); |
1da177e4 | 229 | if (h2 > 32) |
8113c095 | 230 | return NULL; |
1da177e4 | 231 | |
1109c005 | 232 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 | 233 | if (b) { |
1109c005 JF |
234 | for (f = rtnl_dereference(b->ht[h2]); |
235 | f; | |
236 | f = rtnl_dereference(f->next)) | |
1da177e4 | 237 | if (f->handle == handle) |
8113c095 | 238 | return f; |
1da177e4 | 239 | } |
8113c095 | 240 | return NULL; |
1da177e4 LT |
241 | } |
242 | ||
1da177e4 LT |
243 | static int route4_init(struct tcf_proto *tp) |
244 | { | |
a05c2d11 WC |
245 | struct route4_head *head; |
246 | ||
247 | head = kzalloc(sizeof(struct route4_head), GFP_KERNEL); | |
248 | if (head == NULL) | |
249 | return -ENOBUFS; | |
250 | ||
251 | rcu_assign_pointer(tp->root, head); | |
1da177e4 LT |
252 | return 0; |
253 | } | |
254 | ||
3fd51de5 CW |
255 | static void __route4_delete_filter(struct route4_filter *f) |
256 | { | |
257 | tcf_exts_destroy(&f->exts); | |
258 | tcf_exts_put_net(&f->exts); | |
259 | kfree(f); | |
260 | } | |
261 | ||
c2f3f31d | 262 | static void route4_delete_filter_work(struct work_struct *work) |
1da177e4 | 263 | { |
aaa908ff CW |
264 | struct route4_filter *f = container_of(to_rcu_work(work), |
265 | struct route4_filter, | |
266 | rwork); | |
c2f3f31d | 267 | rtnl_lock(); |
3fd51de5 | 268 | __route4_delete_filter(f); |
c2f3f31d CW |
269 | rtnl_unlock(); |
270 | } | |
271 | ||
aaa908ff | 272 | static void route4_queue_work(struct route4_filter *f) |
c2f3f31d | 273 | { |
aaa908ff | 274 | tcf_queue_work(&f->rwork, route4_delete_filter_work); |
1da177e4 LT |
275 | } |
276 | ||
12db03b6 VB |
277 | static void route4_destroy(struct tcf_proto *tp, bool rtnl_held, |
278 | struct netlink_ext_ack *extack) | |
1da177e4 | 279 | { |
1109c005 | 280 | struct route4_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
281 | int h1, h2; |
282 | ||
283 | if (head == NULL) | |
763dbf63 | 284 | return; |
1da177e4 | 285 | |
cc7ec456 | 286 | for (h1 = 0; h1 <= 256; h1++) { |
1da177e4 LT |
287 | struct route4_bucket *b; |
288 | ||
1109c005 | 289 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 ED |
290 | if (b) { |
291 | for (h2 = 0; h2 <= 32; h2++) { | |
1da177e4 LT |
292 | struct route4_filter *f; |
293 | ||
1109c005 JF |
294 | while ((f = rtnl_dereference(b->ht[h2])) != NULL) { |
295 | struct route4_filter *next; | |
296 | ||
297 | next = rtnl_dereference(f->next); | |
298 | RCU_INIT_POINTER(b->ht[h2], next); | |
18cdb37e | 299 | tcf_unbind_filter(tp, &f->res); |
3fd51de5 | 300 | if (tcf_exts_get_net(&f->exts)) |
aaa908ff | 301 | route4_queue_work(f); |
3fd51de5 CW |
302 | else |
303 | __route4_delete_filter(f); | |
1da177e4 LT |
304 | } |
305 | } | |
1109c005 JF |
306 | RCU_INIT_POINTER(head->table[h1], NULL); |
307 | kfree_rcu(b, rcu); | |
1da177e4 LT |
308 | } |
309 | } | |
1109c005 | 310 | kfree_rcu(head, rcu); |
1da177e4 LT |
311 | } |
312 | ||
571acf21 | 313 | static int route4_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 314 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 315 | { |
1109c005 | 316 | struct route4_head *head = rtnl_dereference(tp->root); |
8113c095 | 317 | struct route4_filter *f = arg; |
1109c005 JF |
318 | struct route4_filter __rcu **fp; |
319 | struct route4_filter *nf; | |
1da177e4 | 320 | struct route4_bucket *b; |
1109c005 | 321 | unsigned int h = 0; |
763dbf63 | 322 | int i, h1; |
1da177e4 LT |
323 | |
324 | if (!head || !f) | |
325 | return -EINVAL; | |
326 | ||
327 | h = f->handle; | |
328 | b = f->bkt; | |
329 | ||
1109c005 JF |
330 | fp = &b->ht[from_hash(h >> 16)]; |
331 | for (nf = rtnl_dereference(*fp); nf; | |
332 | fp = &nf->next, nf = rtnl_dereference(*fp)) { | |
333 | if (nf == f) { | |
334 | /* unlink it */ | |
335 | RCU_INIT_POINTER(*fp, rtnl_dereference(f->next)); | |
1da177e4 | 336 | |
1109c005 JF |
337 | /* Remove any fastmap lookups that might ref filter |
338 | * notice we unlink'd the filter so we can't get it | |
339 | * back in the fastmap. | |
340 | */ | |
341 | route4_reset_fastmap(head); | |
1da177e4 | 342 | |
1109c005 | 343 | /* Delete it */ |
18cdb37e | 344 | tcf_unbind_filter(tp, &f->res); |
3fd51de5 | 345 | tcf_exts_get_net(&f->exts); |
aaa908ff | 346 | tcf_queue_work(&f->rwork, route4_delete_filter_work); |
1da177e4 | 347 | |
1109c005 JF |
348 | /* Strip RTNL protected tree */ |
349 | for (i = 0; i <= 32; i++) { | |
350 | struct route4_filter *rt; | |
351 | ||
352 | rt = rtnl_dereference(b->ht[i]); | |
353 | if (rt) | |
763dbf63 | 354 | goto out; |
1109c005 | 355 | } |
1da177e4 LT |
356 | |
357 | /* OK, session has no flows */ | |
1109c005 JF |
358 | RCU_INIT_POINTER(head->table[to_hash(h)], NULL); |
359 | kfree_rcu(b, rcu); | |
763dbf63 WC |
360 | break; |
361 | } | |
362 | } | |
1da177e4 | 363 | |
763dbf63 WC |
364 | out: |
365 | *last = true; | |
366 | for (h1 = 0; h1 <= 256; h1++) { | |
367 | if (rcu_access_pointer(head->table[h1])) { | |
368 | *last = false; | |
369 | break; | |
1da177e4 LT |
370 | } |
371 | } | |
763dbf63 | 372 | |
1da177e4 LT |
373 | return 0; |
374 | } | |
375 | ||
6fa8c014 PM |
376 | static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = { |
377 | [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 }, | |
378 | [TCA_ROUTE4_TO] = { .type = NLA_U32 }, | |
379 | [TCA_ROUTE4_FROM] = { .type = NLA_U32 }, | |
380 | [TCA_ROUTE4_IIF] = { .type = NLA_U32 }, | |
381 | }; | |
382 | ||
c1b52739 BL |
383 | static int route4_set_parms(struct net *net, struct tcf_proto *tp, |
384 | unsigned long base, struct route4_filter *f, | |
385 | u32 handle, struct route4_head *head, | |
2f7ef2f8 | 386 | struct nlattr **tb, struct nlattr *est, int new, |
695176bf | 387 | u32 flags, struct netlink_ext_ack *extack) |
1da177e4 | 388 | { |
1da177e4 LT |
389 | u32 id = 0, to = 0, nhandle = 0x8000; |
390 | struct route4_filter *fp; | |
391 | unsigned int h1; | |
392 | struct route4_bucket *b; | |
b9a24bb7 | 393 | int err; |
1da177e4 | 394 | |
695176bf | 395 | err = tcf_exts_validate(net, tp, tb, est, &f->exts, flags, extack); |
1da177e4 LT |
396 | if (err < 0) |
397 | return err; | |
398 | ||
add93b61 | 399 | if (tb[TCA_ROUTE4_TO]) { |
1da177e4 | 400 | if (new && handle & 0x8000) |
8c98d571 | 401 | return -EINVAL; |
1587bac4 | 402 | to = nla_get_u32(tb[TCA_ROUTE4_TO]); |
1da177e4 | 403 | if (to > 0xFF) |
8c98d571 | 404 | return -EINVAL; |
1da177e4 LT |
405 | nhandle = to; |
406 | } | |
407 | ||
add93b61 PM |
408 | if (tb[TCA_ROUTE4_FROM]) { |
409 | if (tb[TCA_ROUTE4_IIF]) | |
8c98d571 | 410 | return -EINVAL; |
1587bac4 | 411 | id = nla_get_u32(tb[TCA_ROUTE4_FROM]); |
1da177e4 | 412 | if (id > 0xFF) |
8c98d571 | 413 | return -EINVAL; |
1da177e4 | 414 | nhandle |= id << 16; |
add93b61 | 415 | } else if (tb[TCA_ROUTE4_IIF]) { |
1587bac4 | 416 | id = nla_get_u32(tb[TCA_ROUTE4_IIF]); |
1da177e4 | 417 | if (id > 0x7FFF) |
8c98d571 | 418 | return -EINVAL; |
1da177e4 LT |
419 | nhandle |= (id | 0x8000) << 16; |
420 | } else | |
421 | nhandle |= 0xFFFF << 16; | |
422 | ||
423 | if (handle && new) { | |
424 | nhandle |= handle & 0x7F00; | |
425 | if (nhandle != handle) | |
8c98d571 | 426 | return -EINVAL; |
1da177e4 LT |
427 | } |
428 | ||
02799571 JHS |
429 | if (!nhandle) { |
430 | NL_SET_ERR_MSG(extack, "Replacing with handle of 0 is invalid"); | |
431 | return -EINVAL; | |
432 | } | |
433 | ||
1da177e4 | 434 | h1 = to_hash(nhandle); |
1109c005 | 435 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 | 436 | if (!b) { |
0da974f4 | 437 | b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL); |
1da177e4 | 438 | if (b == NULL) |
8c98d571 | 439 | return -ENOBUFS; |
1da177e4 | 440 | |
1109c005 | 441 | rcu_assign_pointer(head->table[h1], b); |
1da177e4 LT |
442 | } else { |
443 | unsigned int h2 = from_hash(nhandle >> 16); | |
cc7ec456 | 444 | |
1109c005 JF |
445 | for (fp = rtnl_dereference(b->ht[h2]); |
446 | fp; | |
447 | fp = rtnl_dereference(fp->next)) | |
1da177e4 | 448 | if (fp->handle == f->handle) |
8c98d571 | 449 | return -EEXIST; |
1da177e4 LT |
450 | } |
451 | ||
add93b61 | 452 | if (tb[TCA_ROUTE4_TO]) |
1da177e4 LT |
453 | f->id = to; |
454 | ||
add93b61 | 455 | if (tb[TCA_ROUTE4_FROM]) |
1da177e4 | 456 | f->id = to | id<<16; |
add93b61 | 457 | else if (tb[TCA_ROUTE4_IIF]) |
1da177e4 LT |
458 | f->iif = id; |
459 | ||
460 | f->handle = nhandle; | |
461 | f->bkt = b; | |
1109c005 | 462 | f->tp = tp; |
1da177e4 | 463 | |
add93b61 | 464 | if (tb[TCA_ROUTE4_CLASSID]) { |
1587bac4 | 465 | f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]); |
1da177e4 LT |
466 | tcf_bind_filter(tp, &f->res, base); |
467 | } | |
468 | ||
1da177e4 | 469 | return 0; |
1da177e4 LT |
470 | } |
471 | ||
c1b52739 | 472 | static int route4_change(struct net *net, struct sk_buff *in_skb, |
5a7a5555 | 473 | struct tcf_proto *tp, unsigned long base, u32 handle, |
695176bf CW |
474 | struct nlattr **tca, void **arg, u32 flags, |
475 | struct netlink_ext_ack *extack) | |
1da177e4 | 476 | { |
1109c005 JF |
477 | struct route4_head *head = rtnl_dereference(tp->root); |
478 | struct route4_filter __rcu **fp; | |
479 | struct route4_filter *fold, *f1, *pfp, *f = NULL; | |
1da177e4 | 480 | struct route4_bucket *b; |
add93b61 PM |
481 | struct nlattr *opt = tca[TCA_OPTIONS]; |
482 | struct nlattr *tb[TCA_ROUTE4_MAX + 1]; | |
1da177e4 | 483 | unsigned int h, th; |
1da177e4 | 484 | int err; |
1109c005 | 485 | bool new = true; |
1da177e4 | 486 | |
02799571 JHS |
487 | if (!handle) { |
488 | NL_SET_ERR_MSG(extack, "Creating with handle of 0 is invalid"); | |
489 | return -EINVAL; | |
490 | } | |
491 | ||
1da177e4 | 492 | if (opt == NULL) |
53a40680 | 493 | return -EINVAL; |
1da177e4 | 494 | |
8cb08174 JB |
495 | err = nla_parse_nested_deprecated(tb, TCA_ROUTE4_MAX, opt, |
496 | route4_policy, NULL); | |
cee63723 PM |
497 | if (err < 0) |
498 | return err; | |
1da177e4 | 499 | |
8113c095 | 500 | fold = *arg; |
53a40680 | 501 | if (fold && fold->handle != handle) |
1da177e4 LT |
502 | return -EINVAL; |
503 | ||
1da177e4 | 504 | err = -ENOBUFS; |
0da974f4 | 505 | f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL); |
1109c005 | 506 | if (!f) |
1da177e4 | 507 | goto errout; |
1da177e4 | 508 | |
14215108 | 509 | err = tcf_exts_init(&f->exts, net, TCA_ROUTE4_ACT, TCA_ROUTE4_POLICE); |
b9a24bb7 WC |
510 | if (err < 0) |
511 | goto errout; | |
512 | ||
1109c005 JF |
513 | if (fold) { |
514 | f->id = fold->id; | |
515 | f->iif = fold->iif; | |
516 | f->res = fold->res; | |
517 | f->handle = fold->handle; | |
518 | ||
519 | f->tp = fold->tp; | |
520 | f->bkt = fold->bkt; | |
521 | new = false; | |
522 | } | |
523 | ||
c1b52739 | 524 | err = route4_set_parms(net, tp, base, f, handle, head, tb, |
695176bf | 525 | tca[TCA_RATE], new, flags, extack); |
1da177e4 LT |
526 | if (err < 0) |
527 | goto errout; | |
528 | ||
1da177e4 | 529 | h = from_hash(f->handle >> 16); |
1109c005 JF |
530 | fp = &f->bkt->ht[h]; |
531 | for (pfp = rtnl_dereference(*fp); | |
532 | (f1 = rtnl_dereference(*fp)) != NULL; | |
533 | fp = &f1->next) | |
1da177e4 LT |
534 | if (f->handle < f1->handle) |
535 | break; | |
536 | ||
f36fe1c4 | 537 | tcf_block_netif_keep_dst(tp->chain->block); |
1109c005 JF |
538 | rcu_assign_pointer(f->next, f1); |
539 | rcu_assign_pointer(*fp, f); | |
1da177e4 | 540 | |
9ad36309 | 541 | if (fold) { |
1109c005 JF |
542 | th = to_hash(fold->handle); |
543 | h = from_hash(fold->handle >> 16); | |
544 | b = rtnl_dereference(head->table[th]); | |
cc7ec456 | 545 | if (b) { |
1109c005 JF |
546 | fp = &b->ht[h]; |
547 | for (pfp = rtnl_dereference(*fp); pfp; | |
548 | fp = &pfp->next, pfp = rtnl_dereference(*fp)) { | |
ef299cc3 CW |
549 | if (pfp == fold) { |
550 | rcu_assign_pointer(*fp, fold->next); | |
1da177e4 LT |
551 | break; |
552 | } | |
553 | } | |
554 | } | |
555 | } | |
1da177e4 | 556 | |
1109c005 | 557 | route4_reset_fastmap(head); |
8113c095 | 558 | *arg = f; |
18cdb37e JF |
559 | if (fold) { |
560 | tcf_unbind_filter(tp, &fold->res); | |
3fd51de5 | 561 | tcf_exts_get_net(&fold->exts); |
aaa908ff | 562 | tcf_queue_work(&fold->rwork, route4_delete_filter_work); |
18cdb37e | 563 | } |
1da177e4 LT |
564 | return 0; |
565 | ||
566 | errout: | |
21641c2e WC |
567 | if (f) |
568 | tcf_exts_destroy(&f->exts); | |
a51482bd | 569 | kfree(f); |
1da177e4 LT |
570 | return err; |
571 | } | |
572 | ||
12db03b6 VB |
573 | static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
574 | bool rtnl_held) | |
1da177e4 | 575 | { |
1109c005 | 576 | struct route4_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 577 | unsigned int h, h1; |
1da177e4 | 578 | |
3027ff41 | 579 | if (head == NULL || arg->stop) |
1da177e4 LT |
580 | return; |
581 | ||
582 | for (h = 0; h <= 256; h++) { | |
1109c005 | 583 | struct route4_bucket *b = rtnl_dereference(head->table[h]); |
1da177e4 LT |
584 | |
585 | if (b) { | |
586 | for (h1 = 0; h1 <= 32; h1++) { | |
587 | struct route4_filter *f; | |
588 | ||
1109c005 JF |
589 | for (f = rtnl_dereference(b->ht[h1]); |
590 | f; | |
591 | f = rtnl_dereference(f->next)) { | |
5508ff7c | 592 | if (!tc_cls_stats_dump(tp, arg, f)) |
1da177e4 | 593 | return; |
1da177e4 LT |
594 | } |
595 | } | |
596 | } | |
597 | } | |
598 | } | |
599 | ||
8113c095 | 600 | static int route4_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 601 | struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
1da177e4 | 602 | { |
8113c095 | 603 | struct route4_filter *f = fh; |
4b3550ef | 604 | struct nlattr *nest; |
1da177e4 LT |
605 | u32 id; |
606 | ||
607 | if (f == NULL) | |
608 | return skb->len; | |
609 | ||
610 | t->tcm_handle = f->handle; | |
611 | ||
ae0be8de | 612 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
4b3550ef PM |
613 | if (nest == NULL) |
614 | goto nla_put_failure; | |
1da177e4 | 615 | |
cc7ec456 ED |
616 | if (!(f->handle & 0x8000)) { |
617 | id = f->id & 0xFF; | |
1b34ec43 DM |
618 | if (nla_put_u32(skb, TCA_ROUTE4_TO, id)) |
619 | goto nla_put_failure; | |
1da177e4 | 620 | } |
cc7ec456 | 621 | if (f->handle & 0x80000000) { |
1b34ec43 DM |
622 | if ((f->handle >> 16) != 0xFFFF && |
623 | nla_put_u32(skb, TCA_ROUTE4_IIF, f->iif)) | |
624 | goto nla_put_failure; | |
1da177e4 | 625 | } else { |
cc7ec456 | 626 | id = f->id >> 16; |
1b34ec43 DM |
627 | if (nla_put_u32(skb, TCA_ROUTE4_FROM, id)) |
628 | goto nla_put_failure; | |
1da177e4 | 629 | } |
1b34ec43 DM |
630 | if (f->res.classid && |
631 | nla_put_u32(skb, TCA_ROUTE4_CLASSID, f->res.classid)) | |
632 | goto nla_put_failure; | |
1da177e4 | 633 | |
5da57f42 | 634 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 635 | goto nla_put_failure; |
1da177e4 | 636 | |
4b3550ef | 637 | nla_nest_end(skb, nest); |
1da177e4 | 638 | |
5da57f42 | 639 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 640 | goto nla_put_failure; |
1da177e4 LT |
641 | |
642 | return skb->len; | |
643 | ||
add93b61 | 644 | nla_put_failure: |
6ea3b446 | 645 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
646 | return -1; |
647 | } | |
648 | ||
2e24cd75 CW |
649 | static void route4_bind_class(void *fh, u32 classid, unsigned long cl, void *q, |
650 | unsigned long base) | |
07d79fc7 CW |
651 | { |
652 | struct route4_filter *f = fh; | |
653 | ||
cc9039a1 | 654 | tc_cls_bind_class(classid, cl, q, &f->res, base); |
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"); |