Commit | Line | Data |
---|---|---|
e5dfb815 PM |
1 | /* |
2 | * net/sched/cls_flow.c Generic flow classifier | |
3 | * | |
4 | * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/jhash.h> | |
16 | #include <linux/random.h> | |
17 | #include <linux/pkt_cls.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/ipv6.h> | |
9ec13810 | 22 | #include <linux/if_vlan.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
3a9a231d | 24 | #include <linux/module.h> |
743b2a66 | 25 | #include <net/inet_sock.h> |
e5dfb815 PM |
26 | |
27 | #include <net/pkt_cls.h> | |
28 | #include <net/ip.h> | |
29 | #include <net/route.h> | |
1bd758eb | 30 | #include <net/flow_dissector.h> |
6bd2a9af | 31 | |
0013de38 | 32 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
e5dfb815 PM |
33 | #include <net/netfilter/nf_conntrack.h> |
34 | #endif | |
35 | ||
36 | struct flow_head { | |
37 | struct list_head filters; | |
70da9f0b | 38 | struct rcu_head rcu; |
e5dfb815 PM |
39 | }; |
40 | ||
41 | struct flow_filter { | |
42 | struct list_head list; | |
43 | struct tcf_exts exts; | |
44 | struct tcf_ematch_tree ematches; | |
70da9f0b | 45 | struct tcf_proto *tp; |
72d9794f PM |
46 | struct timer_list perturb_timer; |
47 | u32 perturb_period; | |
e5dfb815 PM |
48 | u32 handle; |
49 | ||
50 | u32 nkeys; | |
51 | u32 keymask; | |
52 | u32 mode; | |
53 | u32 mask; | |
54 | u32 xor; | |
55 | u32 rshift; | |
56 | u32 addend; | |
57 | u32 divisor; | |
58 | u32 baseclass; | |
72d9794f | 59 | u32 hashrnd; |
94cdb475 CW |
60 | union { |
61 | struct work_struct work; | |
62 | struct rcu_head rcu; | |
63 | }; | |
e5dfb815 PM |
64 | }; |
65 | ||
e5dfb815 PM |
66 | static inline u32 addr_fold(void *addr) |
67 | { | |
68 | unsigned long a = (unsigned long)addr; | |
69 | ||
70 | return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0); | |
71 | } | |
72 | ||
6bd2a9af | 73 | static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 74 | { |
c3f83241 TH |
75 | __be32 src = flow_get_u32_src(flow); |
76 | ||
77 | if (src) | |
78 | return ntohl(src); | |
79 | ||
4b95c3d4 | 80 | return addr_fold(skb->sk); |
e5dfb815 PM |
81 | } |
82 | ||
6bd2a9af | 83 | static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
e5dfb815 | 84 | { |
c3f83241 TH |
85 | __be32 dst = flow_get_u32_dst(flow); |
86 | ||
87 | if (dst) | |
88 | return ntohl(dst); | |
89 | ||
d8b9605d | 90 | return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb); |
e5dfb815 PM |
91 | } |
92 | ||
5a7a5555 JHS |
93 | static u32 flow_get_proto(const struct sk_buff *skb, |
94 | const struct flow_keys *flow) | |
e5dfb815 | 95 | { |
06635a35 | 96 | return flow->basic.ip_proto; |
e5dfb815 PM |
97 | } |
98 | ||
5a7a5555 JHS |
99 | static u32 flow_get_proto_src(const struct sk_buff *skb, |
100 | const struct flow_keys *flow) | |
e5dfb815 | 101 | { |
06635a35 | 102 | if (flow->ports.ports) |
59346afe | 103 | return ntohs(flow->ports.src); |
e5dfb815 | 104 | |
859c2012 ED |
105 | return addr_fold(skb->sk); |
106 | } | |
107 | ||
5a7a5555 JHS |
108 | static u32 flow_get_proto_dst(const struct sk_buff *skb, |
109 | const struct flow_keys *flow) | |
859c2012 | 110 | { |
06635a35 | 111 | if (flow->ports.ports) |
59346afe | 112 | return ntohs(flow->ports.dst); |
e5dfb815 | 113 | |
d8b9605d | 114 | return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb); |
e5dfb815 PM |
115 | } |
116 | ||
117 | static u32 flow_get_iif(const struct sk_buff *skb) | |
118 | { | |
8964be4a | 119 | return skb->skb_iif; |
e5dfb815 PM |
120 | } |
121 | ||
122 | static u32 flow_get_priority(const struct sk_buff *skb) | |
123 | { | |
124 | return skb->priority; | |
125 | } | |
126 | ||
127 | static u32 flow_get_mark(const struct sk_buff *skb) | |
128 | { | |
129 | return skb->mark; | |
130 | } | |
131 | ||
132 | static u32 flow_get_nfct(const struct sk_buff *skb) | |
133 | { | |
0013de38 | 134 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
cb9c6836 | 135 | return addr_fold(skb_nfct(skb)); |
e5dfb815 PM |
136 | #else |
137 | return 0; | |
138 | #endif | |
139 | } | |
140 | ||
0013de38 | 141 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
e5dfb815 PM |
142 | #define CTTUPLE(skb, member) \ |
143 | ({ \ | |
144 | enum ip_conntrack_info ctinfo; \ | |
859c2012 | 145 | const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \ |
e5dfb815 PM |
146 | if (ct == NULL) \ |
147 | goto fallback; \ | |
148 | ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \ | |
149 | }) | |
150 | #else | |
151 | #define CTTUPLE(skb, member) \ | |
152 | ({ \ | |
153 | goto fallback; \ | |
154 | 0; \ | |
155 | }) | |
156 | #endif | |
157 | ||
5a7a5555 JHS |
158 | static u32 flow_get_nfct_src(const struct sk_buff *skb, |
159 | const struct flow_keys *flow) | |
e5dfb815 | 160 | { |
d8b9605d | 161 | switch (tc_skb_protocol(skb)) { |
60678040 | 162 | case htons(ETH_P_IP): |
e5dfb815 | 163 | return ntohl(CTTUPLE(skb, src.u3.ip)); |
60678040 | 164 | case htons(ETH_P_IPV6): |
e5dfb815 PM |
165 | return ntohl(CTTUPLE(skb, src.u3.ip6[3])); |
166 | } | |
167 | fallback: | |
6bd2a9af | 168 | return flow_get_src(skb, flow); |
e5dfb815 PM |
169 | } |
170 | ||
5a7a5555 JHS |
171 | static u32 flow_get_nfct_dst(const struct sk_buff *skb, |
172 | const struct flow_keys *flow) | |
e5dfb815 | 173 | { |
d8b9605d | 174 | switch (tc_skb_protocol(skb)) { |
60678040 | 175 | case htons(ETH_P_IP): |
e5dfb815 | 176 | return ntohl(CTTUPLE(skb, dst.u3.ip)); |
60678040 | 177 | case htons(ETH_P_IPV6): |
e5dfb815 PM |
178 | return ntohl(CTTUPLE(skb, dst.u3.ip6[3])); |
179 | } | |
180 | fallback: | |
6bd2a9af | 181 | return flow_get_dst(skb, flow); |
e5dfb815 PM |
182 | } |
183 | ||
5a7a5555 JHS |
184 | static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, |
185 | const struct flow_keys *flow) | |
e5dfb815 PM |
186 | { |
187 | return ntohs(CTTUPLE(skb, src.u.all)); | |
188 | fallback: | |
6bd2a9af | 189 | return flow_get_proto_src(skb, flow); |
e5dfb815 PM |
190 | } |
191 | ||
5a7a5555 JHS |
192 | static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, |
193 | const struct flow_keys *flow) | |
e5dfb815 PM |
194 | { |
195 | return ntohs(CTTUPLE(skb, dst.u.all)); | |
196 | fallback: | |
6bd2a9af | 197 | return flow_get_proto_dst(skb, flow); |
e5dfb815 PM |
198 | } |
199 | ||
200 | static u32 flow_get_rtclassid(const struct sk_buff *skb) | |
201 | { | |
c7066f70 | 202 | #ifdef CONFIG_IP_ROUTE_CLASSID |
adf30907 ED |
203 | if (skb_dst(skb)) |
204 | return skb_dst(skb)->tclassid; | |
e5dfb815 PM |
205 | #endif |
206 | return 0; | |
207 | } | |
208 | ||
209 | static u32 flow_get_skuid(const struct sk_buff *skb) | |
210 | { | |
743b2a66 ED |
211 | struct sock *sk = skb_to_full_sk(skb); |
212 | ||
213 | if (sk && sk->sk_socket && sk->sk_socket->file) { | |
214 | kuid_t skuid = sk->sk_socket->file->f_cred->fsuid; | |
215 | ||
a6c6796c EB |
216 | return from_kuid(&init_user_ns, skuid); |
217 | } | |
e5dfb815 PM |
218 | return 0; |
219 | } | |
220 | ||
221 | static u32 flow_get_skgid(const struct sk_buff *skb) | |
222 | { | |
743b2a66 ED |
223 | struct sock *sk = skb_to_full_sk(skb); |
224 | ||
225 | if (sk && sk->sk_socket && sk->sk_socket->file) { | |
226 | kgid_t skgid = sk->sk_socket->file->f_cred->fsgid; | |
227 | ||
a6c6796c EB |
228 | return from_kgid(&init_user_ns, skgid); |
229 | } | |
e5dfb815 PM |
230 | return 0; |
231 | } | |
232 | ||
9ec13810 PM |
233 | static u32 flow_get_vlan_tag(const struct sk_buff *skb) |
234 | { | |
235 | u16 uninitialized_var(tag); | |
236 | ||
237 | if (vlan_get_tag(skb, &tag) < 0) | |
238 | return 0; | |
239 | return tag & VLAN_VID_MASK; | |
240 | } | |
241 | ||
739a91ef CG |
242 | static u32 flow_get_rxhash(struct sk_buff *skb) |
243 | { | |
3958afa1 | 244 | return skb_get_hash(skb); |
739a91ef CG |
245 | } |
246 | ||
6bd2a9af | 247 | static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow) |
e5dfb815 PM |
248 | { |
249 | switch (key) { | |
250 | case FLOW_KEY_SRC: | |
6bd2a9af | 251 | return flow_get_src(skb, flow); |
e5dfb815 | 252 | case FLOW_KEY_DST: |
6bd2a9af | 253 | return flow_get_dst(skb, flow); |
e5dfb815 | 254 | case FLOW_KEY_PROTO: |
6bd2a9af | 255 | return flow_get_proto(skb, flow); |
e5dfb815 | 256 | case FLOW_KEY_PROTO_SRC: |
6bd2a9af | 257 | return flow_get_proto_src(skb, flow); |
e5dfb815 | 258 | case FLOW_KEY_PROTO_DST: |
6bd2a9af | 259 | return flow_get_proto_dst(skb, flow); |
e5dfb815 PM |
260 | case FLOW_KEY_IIF: |
261 | return flow_get_iif(skb); | |
262 | case FLOW_KEY_PRIORITY: | |
263 | return flow_get_priority(skb); | |
264 | case FLOW_KEY_MARK: | |
265 | return flow_get_mark(skb); | |
266 | case FLOW_KEY_NFCT: | |
267 | return flow_get_nfct(skb); | |
268 | case FLOW_KEY_NFCT_SRC: | |
6bd2a9af | 269 | return flow_get_nfct_src(skb, flow); |
e5dfb815 | 270 | case FLOW_KEY_NFCT_DST: |
6bd2a9af | 271 | return flow_get_nfct_dst(skb, flow); |
e5dfb815 | 272 | case FLOW_KEY_NFCT_PROTO_SRC: |
6bd2a9af | 273 | return flow_get_nfct_proto_src(skb, flow); |
e5dfb815 | 274 | case FLOW_KEY_NFCT_PROTO_DST: |
6bd2a9af | 275 | return flow_get_nfct_proto_dst(skb, flow); |
e5dfb815 PM |
276 | case FLOW_KEY_RTCLASSID: |
277 | return flow_get_rtclassid(skb); | |
278 | case FLOW_KEY_SKUID: | |
279 | return flow_get_skuid(skb); | |
280 | case FLOW_KEY_SKGID: | |
281 | return flow_get_skgid(skb); | |
9ec13810 PM |
282 | case FLOW_KEY_VLAN_TAG: |
283 | return flow_get_vlan_tag(skb); | |
739a91ef CG |
284 | case FLOW_KEY_RXHASH: |
285 | return flow_get_rxhash(skb); | |
e5dfb815 PM |
286 | default: |
287 | WARN_ON(1); | |
288 | return 0; | |
289 | } | |
290 | } | |
291 | ||
6bd2a9af ED |
292 | #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \ |
293 | (1 << FLOW_KEY_DST) | \ | |
294 | (1 << FLOW_KEY_PROTO) | \ | |
295 | (1 << FLOW_KEY_PROTO_SRC) | \ | |
296 | (1 << FLOW_KEY_PROTO_DST) | \ | |
297 | (1 << FLOW_KEY_NFCT_SRC) | \ | |
298 | (1 << FLOW_KEY_NFCT_DST) | \ | |
299 | (1 << FLOW_KEY_NFCT_PROTO_SRC) | \ | |
300 | (1 << FLOW_KEY_NFCT_PROTO_DST)) | |
301 | ||
dc7f9f6e | 302 | static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
e5dfb815 PM |
303 | struct tcf_result *res) |
304 | { | |
70da9f0b | 305 | struct flow_head *head = rcu_dereference_bh(tp->root); |
e5dfb815 PM |
306 | struct flow_filter *f; |
307 | u32 keymask; | |
308 | u32 classid; | |
309 | unsigned int n, key; | |
310 | int r; | |
311 | ||
70da9f0b | 312 | list_for_each_entry_rcu(f, &head->filters, list) { |
3a53943b | 313 | u32 keys[FLOW_KEY_MAX + 1]; |
6bd2a9af | 314 | struct flow_keys flow_keys; |
e5dfb815 PM |
315 | |
316 | if (!tcf_em_tree_match(skb, &f->ematches, NULL)) | |
317 | continue; | |
318 | ||
319 | keymask = f->keymask; | |
6bd2a9af | 320 | if (keymask & FLOW_KEYS_NEEDED) |
cd79a238 | 321 | skb_flow_dissect_flow_keys(skb, &flow_keys, 0); |
e5dfb815 PM |
322 | |
323 | for (n = 0; n < f->nkeys; n++) { | |
324 | key = ffs(keymask) - 1; | |
325 | keymask &= ~(1 << key); | |
6bd2a9af | 326 | keys[n] = flow_key_get(skb, key, &flow_keys); |
e5dfb815 PM |
327 | } |
328 | ||
329 | if (f->mode == FLOW_MODE_HASH) | |
72d9794f | 330 | classid = jhash2(keys, f->nkeys, f->hashrnd); |
e5dfb815 PM |
331 | else { |
332 | classid = keys[0]; | |
333 | classid = (classid & f->mask) ^ f->xor; | |
334 | classid = (classid >> f->rshift) + f->addend; | |
335 | } | |
336 | ||
337 | if (f->divisor) | |
338 | classid %= f->divisor; | |
339 | ||
340 | res->class = 0; | |
341 | res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid); | |
342 | ||
343 | r = tcf_exts_exec(skb, &f->exts, res); | |
344 | if (r < 0) | |
345 | continue; | |
346 | return r; | |
347 | } | |
348 | return -1; | |
349 | } | |
350 | ||
cdeabbb8 | 351 | static void flow_perturbation(struct timer_list *t) |
72d9794f | 352 | { |
cdeabbb8 | 353 | struct flow_filter *f = from_timer(f, t, perturb_timer); |
72d9794f PM |
354 | |
355 | get_random_bytes(&f->hashrnd, 4); | |
356 | if (f->perturb_period) | |
357 | mod_timer(&f->perturb_timer, jiffies + f->perturb_period); | |
358 | } | |
359 | ||
e5dfb815 PM |
360 | static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = { |
361 | [TCA_FLOW_KEYS] = { .type = NLA_U32 }, | |
362 | [TCA_FLOW_MODE] = { .type = NLA_U32 }, | |
363 | [TCA_FLOW_BASECLASS] = { .type = NLA_U32 }, | |
364 | [TCA_FLOW_RSHIFT] = { .type = NLA_U32 }, | |
365 | [TCA_FLOW_ADDEND] = { .type = NLA_U32 }, | |
366 | [TCA_FLOW_MASK] = { .type = NLA_U32 }, | |
367 | [TCA_FLOW_XOR] = { .type = NLA_U32 }, | |
368 | [TCA_FLOW_DIVISOR] = { .type = NLA_U32 }, | |
369 | [TCA_FLOW_ACT] = { .type = NLA_NESTED }, | |
370 | [TCA_FLOW_POLICE] = { .type = NLA_NESTED }, | |
371 | [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED }, | |
72d9794f | 372 | [TCA_FLOW_PERTURB] = { .type = NLA_U32 }, |
e5dfb815 PM |
373 | }; |
374 | ||
22f7cec9 | 375 | static void __flow_destroy_filter(struct flow_filter *f) |
70da9f0b | 376 | { |
70da9f0b | 377 | del_timer_sync(&f->perturb_timer); |
18d0264f | 378 | tcf_exts_destroy(&f->exts); |
82a470f1 | 379 | tcf_em_tree_destroy(&f->ematches); |
22f7cec9 | 380 | tcf_exts_put_net(&f->exts); |
70da9f0b | 381 | kfree(f); |
22f7cec9 CW |
382 | } |
383 | ||
384 | static void flow_destroy_filter_work(struct work_struct *work) | |
385 | { | |
386 | struct flow_filter *f = container_of(work, struct flow_filter, work); | |
387 | ||
388 | rtnl_lock(); | |
389 | __flow_destroy_filter(f); | |
94cdb475 CW |
390 | rtnl_unlock(); |
391 | } | |
392 | ||
393 | static void flow_destroy_filter(struct rcu_head *head) | |
394 | { | |
395 | struct flow_filter *f = container_of(head, struct flow_filter, rcu); | |
396 | ||
397 | INIT_WORK(&f->work, flow_destroy_filter_work); | |
398 | tcf_queue_work(&f->work); | |
70da9f0b JF |
399 | } |
400 | ||
c1b52739 | 401 | static int flow_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 402 | struct tcf_proto *tp, unsigned long base, |
e5dfb815 | 403 | u32 handle, struct nlattr **tca, |
7306db38 | 404 | void **arg, bool ovr, struct netlink_ext_ack *extack) |
e5dfb815 | 405 | { |
70da9f0b JF |
406 | struct flow_head *head = rtnl_dereference(tp->root); |
407 | struct flow_filter *fold, *fnew; | |
e5dfb815 PM |
408 | struct nlattr *opt = tca[TCA_OPTIONS]; |
409 | struct nlattr *tb[TCA_FLOW_MAX + 1]; | |
e5dfb815 | 410 | unsigned int nkeys = 0; |
72d9794f | 411 | unsigned int perturb_period = 0; |
e5dfb815 PM |
412 | u32 baseclass = 0; |
413 | u32 keymask = 0; | |
414 | u32 mode; | |
415 | int err; | |
416 | ||
417 | if (opt == NULL) | |
418 | return -EINVAL; | |
419 | ||
fceb6435 | 420 | err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy, NULL); |
e5dfb815 PM |
421 | if (err < 0) |
422 | return err; | |
423 | ||
424 | if (tb[TCA_FLOW_BASECLASS]) { | |
425 | baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]); | |
426 | if (TC_H_MIN(baseclass) == 0) | |
427 | return -EINVAL; | |
428 | } | |
429 | ||
430 | if (tb[TCA_FLOW_KEYS]) { | |
431 | keymask = nla_get_u32(tb[TCA_FLOW_KEYS]); | |
e5dfb815 PM |
432 | |
433 | nkeys = hweight32(keymask); | |
434 | if (nkeys == 0) | |
435 | return -EINVAL; | |
4f250491 PM |
436 | |
437 | if (fls(keymask) - 1 > FLOW_KEY_MAX) | |
438 | return -EOPNOTSUPP; | |
a6c6796c EB |
439 | |
440 | if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) && | |
e32123e5 | 441 | sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns) |
a6c6796c | 442 | return -EOPNOTSUPP; |
e5dfb815 PM |
443 | } |
444 | ||
70da9f0b JF |
445 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
446 | if (!fnew) | |
c09fc2e1 | 447 | return -ENOBUFS; |
4ebc1e3c JP |
448 | |
449 | err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches); | |
450 | if (err < 0) | |
c09fc2e1 | 451 | goto err1; |
70da9f0b | 452 | |
b9a24bb7 WC |
453 | err = tcf_exts_init(&fnew->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE); |
454 | if (err < 0) | |
c09fc2e1 JP |
455 | goto err2; |
456 | ||
50a56190 AA |
457 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, ovr, |
458 | extack); | |
c09fc2e1 JP |
459 | if (err < 0) |
460 | goto err2; | |
32b2f4b1 | 461 | |
8113c095 | 462 | fold = *arg; |
70da9f0b | 463 | if (fold) { |
e5dfb815 | 464 | err = -EINVAL; |
70da9f0b | 465 | if (fold->handle != handle && handle) |
c09fc2e1 | 466 | goto err2; |
e5dfb815 | 467 | |
70da9f0b | 468 | /* Copy fold into fnew */ |
70da9f0b | 469 | fnew->tp = fold->tp; |
70da9f0b JF |
470 | fnew->handle = fold->handle; |
471 | fnew->nkeys = fold->nkeys; | |
472 | fnew->keymask = fold->keymask; | |
473 | fnew->mode = fold->mode; | |
474 | fnew->mask = fold->mask; | |
475 | fnew->xor = fold->xor; | |
476 | fnew->rshift = fold->rshift; | |
477 | fnew->addend = fold->addend; | |
478 | fnew->divisor = fold->divisor; | |
479 | fnew->baseclass = fold->baseclass; | |
480 | fnew->hashrnd = fold->hashrnd; | |
481 | ||
482 | mode = fold->mode; | |
e5dfb815 PM |
483 | if (tb[TCA_FLOW_MODE]) |
484 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); | |
485 | if (mode != FLOW_MODE_HASH && nkeys > 1) | |
c09fc2e1 | 486 | goto err2; |
72d9794f PM |
487 | |
488 | if (mode == FLOW_MODE_HASH) | |
70da9f0b | 489 | perturb_period = fold->perturb_period; |
72d9794f PM |
490 | if (tb[TCA_FLOW_PERTURB]) { |
491 | if (mode != FLOW_MODE_HASH) | |
c09fc2e1 | 492 | goto err2; |
72d9794f PM |
493 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; |
494 | } | |
e5dfb815 PM |
495 | } else { |
496 | err = -EINVAL; | |
497 | if (!handle) | |
c09fc2e1 | 498 | goto err2; |
e5dfb815 | 499 | if (!tb[TCA_FLOW_KEYS]) |
c09fc2e1 | 500 | goto err2; |
e5dfb815 PM |
501 | |
502 | mode = FLOW_MODE_MAP; | |
503 | if (tb[TCA_FLOW_MODE]) | |
504 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); | |
505 | if (mode != FLOW_MODE_HASH && nkeys > 1) | |
c09fc2e1 | 506 | goto err2; |
e5dfb815 | 507 | |
72d9794f PM |
508 | if (tb[TCA_FLOW_PERTURB]) { |
509 | if (mode != FLOW_MODE_HASH) | |
c09fc2e1 | 510 | goto err2; |
72d9794f PM |
511 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; |
512 | } | |
513 | ||
1abf2720 JP |
514 | if (TC_H_MAJ(baseclass) == 0) { |
515 | struct Qdisc *q = tcf_block_q(tp->chain->block); | |
516 | ||
517 | baseclass = TC_H_MAKE(q->handle, baseclass); | |
518 | } | |
e5dfb815 PM |
519 | if (TC_H_MIN(baseclass) == 0) |
520 | baseclass = TC_H_MAKE(baseclass, 1); | |
521 | ||
70da9f0b JF |
522 | fnew->handle = handle; |
523 | fnew->mask = ~0U; | |
524 | fnew->tp = tp; | |
525 | get_random_bytes(&fnew->hashrnd, 4); | |
e5dfb815 PM |
526 | } |
527 | ||
cdeabbb8 | 528 | timer_setup(&fnew->perturb_timer, flow_perturbation, TIMER_DEFERRABLE); |
e5dfb815 | 529 | |
f36fe1c4 | 530 | tcf_block_netif_keep_dst(tp->chain->block); |
02875878 | 531 | |
e5dfb815 | 532 | if (tb[TCA_FLOW_KEYS]) { |
70da9f0b JF |
533 | fnew->keymask = keymask; |
534 | fnew->nkeys = nkeys; | |
e5dfb815 PM |
535 | } |
536 | ||
70da9f0b | 537 | fnew->mode = mode; |
e5dfb815 PM |
538 | |
539 | if (tb[TCA_FLOW_MASK]) | |
70da9f0b | 540 | fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]); |
e5dfb815 | 541 | if (tb[TCA_FLOW_XOR]) |
70da9f0b | 542 | fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]); |
e5dfb815 | 543 | if (tb[TCA_FLOW_RSHIFT]) |
70da9f0b | 544 | fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]); |
e5dfb815 | 545 | if (tb[TCA_FLOW_ADDEND]) |
70da9f0b | 546 | fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]); |
e5dfb815 PM |
547 | |
548 | if (tb[TCA_FLOW_DIVISOR]) | |
70da9f0b | 549 | fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]); |
e5dfb815 | 550 | if (baseclass) |
70da9f0b | 551 | fnew->baseclass = baseclass; |
e5dfb815 | 552 | |
70da9f0b | 553 | fnew->perturb_period = perturb_period; |
72d9794f | 554 | if (perturb_period) |
70da9f0b | 555 | mod_timer(&fnew->perturb_timer, jiffies + perturb_period); |
72d9794f | 556 | |
8113c095 | 557 | if (!*arg) |
70da9f0b JF |
558 | list_add_tail_rcu(&fnew->list, &head->filters); |
559 | else | |
32b2f4b1 | 560 | list_replace_rcu(&fold->list, &fnew->list); |
e5dfb815 | 561 | |
8113c095 | 562 | *arg = fnew; |
e5dfb815 | 563 | |
22f7cec9 CW |
564 | if (fold) { |
565 | tcf_exts_get_net(&fold->exts); | |
70da9f0b | 566 | call_rcu(&fold->rcu, flow_destroy_filter); |
22f7cec9 | 567 | } |
e5dfb815 PM |
568 | return 0; |
569 | ||
c09fc2e1 | 570 | err2: |
b9a24bb7 | 571 | tcf_exts_destroy(&fnew->exts); |
4ebc1e3c | 572 | tcf_em_tree_destroy(&fnew->ematches); |
e5dfb815 | 573 | err1: |
c09fc2e1 | 574 | kfree(fnew); |
e5dfb815 PM |
575 | return err; |
576 | } | |
577 | ||
571acf21 AA |
578 | static int flow_delete(struct tcf_proto *tp, void *arg, bool *last, |
579 | struct netlink_ext_ack *extack) | |
e5dfb815 | 580 | { |
763dbf63 | 581 | struct flow_head *head = rtnl_dereference(tp->root); |
8113c095 | 582 | struct flow_filter *f = arg; |
e5dfb815 | 583 | |
70da9f0b | 584 | list_del_rcu(&f->list); |
22f7cec9 | 585 | tcf_exts_get_net(&f->exts); |
70da9f0b | 586 | call_rcu(&f->rcu, flow_destroy_filter); |
763dbf63 | 587 | *last = list_empty(&head->filters); |
e5dfb815 PM |
588 | return 0; |
589 | } | |
590 | ||
591 | static int flow_init(struct tcf_proto *tp) | |
592 | { | |
593 | struct flow_head *head; | |
594 | ||
e5dfb815 PM |
595 | head = kzalloc(sizeof(*head), GFP_KERNEL); |
596 | if (head == NULL) | |
597 | return -ENOBUFS; | |
598 | INIT_LIST_HEAD(&head->filters); | |
70da9f0b | 599 | rcu_assign_pointer(tp->root, head); |
e5dfb815 PM |
600 | return 0; |
601 | } | |
602 | ||
715df5ec | 603 | static void flow_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack) |
e5dfb815 | 604 | { |
70da9f0b | 605 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
606 | struct flow_filter *f, *next; |
607 | ||
608 | list_for_each_entry_safe(f, next, &head->filters, list) { | |
70da9f0b | 609 | list_del_rcu(&f->list); |
22f7cec9 CW |
610 | if (tcf_exts_get_net(&f->exts)) |
611 | call_rcu(&f->rcu, flow_destroy_filter); | |
612 | else | |
613 | __flow_destroy_filter(f); | |
e5dfb815 | 614 | } |
70da9f0b | 615 | kfree_rcu(head, rcu); |
e5dfb815 PM |
616 | } |
617 | ||
8113c095 | 618 | static void *flow_get(struct tcf_proto *tp, u32 handle) |
e5dfb815 | 619 | { |
70da9f0b | 620 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
621 | struct flow_filter *f; |
622 | ||
6a659cd0 | 623 | list_for_each_entry(f, &head->filters, list) |
e5dfb815 | 624 | if (f->handle == handle) |
8113c095 WC |
625 | return f; |
626 | return NULL; | |
e5dfb815 PM |
627 | } |
628 | ||
8113c095 | 629 | static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh, |
e5dfb815 PM |
630 | struct sk_buff *skb, struct tcmsg *t) |
631 | { | |
8113c095 | 632 | struct flow_filter *f = fh; |
e5dfb815 PM |
633 | struct nlattr *nest; |
634 | ||
635 | if (f == NULL) | |
636 | return skb->len; | |
637 | ||
638 | t->tcm_handle = f->handle; | |
639 | ||
640 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
641 | if (nest == NULL) | |
642 | goto nla_put_failure; | |
643 | ||
1b34ec43 DM |
644 | if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) || |
645 | nla_put_u32(skb, TCA_FLOW_MODE, f->mode)) | |
646 | goto nla_put_failure; | |
e5dfb815 PM |
647 | |
648 | if (f->mask != ~0 || f->xor != 0) { | |
1b34ec43 DM |
649 | if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) || |
650 | nla_put_u32(skb, TCA_FLOW_XOR, f->xor)) | |
651 | goto nla_put_failure; | |
e5dfb815 | 652 | } |
1b34ec43 DM |
653 | if (f->rshift && |
654 | nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift)) | |
655 | goto nla_put_failure; | |
656 | if (f->addend && | |
657 | nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend)) | |
658 | goto nla_put_failure; | |
e5dfb815 | 659 | |
1b34ec43 DM |
660 | if (f->divisor && |
661 | nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor)) | |
662 | goto nla_put_failure; | |
663 | if (f->baseclass && | |
664 | nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass)) | |
665 | goto nla_put_failure; | |
e5dfb815 | 666 | |
1b34ec43 DM |
667 | if (f->perturb_period && |
668 | nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ)) | |
669 | goto nla_put_failure; | |
72d9794f | 670 | |
5da57f42 | 671 | if (tcf_exts_dump(skb, &f->exts) < 0) |
e5dfb815 | 672 | goto nla_put_failure; |
0aead543 | 673 | #ifdef CONFIG_NET_EMATCH |
e5dfb815 PM |
674 | if (f->ematches.hdr.nmatches && |
675 | tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0) | |
676 | goto nla_put_failure; | |
0aead543 | 677 | #endif |
e5dfb815 PM |
678 | nla_nest_end(skb, nest); |
679 | ||
5da57f42 | 680 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
e5dfb815 PM |
681 | goto nla_put_failure; |
682 | ||
683 | return skb->len; | |
684 | ||
685 | nla_put_failure: | |
6ea3b446 | 686 | nla_nest_cancel(skb, nest); |
e5dfb815 PM |
687 | return -1; |
688 | } | |
689 | ||
690 | static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
691 | { | |
70da9f0b | 692 | struct flow_head *head = rtnl_dereference(tp->root); |
e5dfb815 PM |
693 | struct flow_filter *f; |
694 | ||
6a659cd0 | 695 | list_for_each_entry(f, &head->filters, list) { |
e5dfb815 PM |
696 | if (arg->count < arg->skip) |
697 | goto skip; | |
8113c095 | 698 | if (arg->fn(tp, f, arg) < 0) { |
e5dfb815 PM |
699 | arg->stop = 1; |
700 | break; | |
701 | } | |
702 | skip: | |
703 | arg->count++; | |
704 | } | |
705 | } | |
706 | ||
707 | static struct tcf_proto_ops cls_flow_ops __read_mostly = { | |
708 | .kind = "flow", | |
709 | .classify = flow_classify, | |
710 | .init = flow_init, | |
711 | .destroy = flow_destroy, | |
712 | .change = flow_change, | |
713 | .delete = flow_delete, | |
714 | .get = flow_get, | |
e5dfb815 PM |
715 | .dump = flow_dump, |
716 | .walk = flow_walk, | |
717 | .owner = THIS_MODULE, | |
718 | }; | |
719 | ||
720 | static int __init cls_flow_init(void) | |
721 | { | |
722 | return register_tcf_proto_ops(&cls_flow_ops); | |
723 | } | |
724 | ||
725 | static void __exit cls_flow_exit(void) | |
726 | { | |
727 | unregister_tcf_proto_ops(&cls_flow_ops); | |
728 | } | |
729 | ||
730 | module_init(cls_flow_init); | |
731 | module_exit(cls_flow_exit); | |
732 | ||
733 | MODULE_LICENSE("GPL"); | |
734 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
735 | MODULE_DESCRIPTION("TC flow classifier"); |