blob: 35be16f7c192dc8d5d2ebdd38c2b27a144c41076 [file] [log] [blame]
Patrick McHardye5dfb812008-01-31 18:37:42 -08001/*
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>
Patrick McHardy9ec13812008-02-05 16:21:04 -080022#include <linux/if_vlan.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040024#include <linux/module.h>
Patrick McHardye5dfb812008-01-31 18:37:42 -080025
26#include <net/pkt_cls.h>
27#include <net/ip.h>
28#include <net/route.h>
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000029#include <net/flow_keys.h>
30
Patrick McHardye5dfb812008-01-31 18:37:42 -080031#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
32#include <net/netfilter/nf_conntrack.h>
33#endif
34
35struct flow_head {
36 struct list_head filters;
37};
38
39struct flow_filter {
40 struct list_head list;
41 struct tcf_exts exts;
42 struct tcf_ematch_tree ematches;
Patrick McHardy72d97942008-07-14 20:36:32 -070043 struct timer_list perturb_timer;
44 u32 perturb_period;
Patrick McHardye5dfb812008-01-31 18:37:42 -080045 u32 handle;
46
47 u32 nkeys;
48 u32 keymask;
49 u32 mode;
50 u32 mask;
51 u32 xor;
52 u32 rshift;
53 u32 addend;
54 u32 divisor;
55 u32 baseclass;
Patrick McHardy72d97942008-07-14 20:36:32 -070056 u32 hashrnd;
Patrick McHardye5dfb812008-01-31 18:37:42 -080057};
58
Patrick McHardye5dfb812008-01-31 18:37:42 -080059static inline u32 addr_fold(void *addr)
60{
61 unsigned long a = (unsigned long)addr;
62
63 return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
64}
65
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000066static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -080067{
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000068 if (flow->src)
69 return ntohl(flow->src);
Changli Gao4b95c3d2010-08-04 04:48:12 +000070 return addr_fold(skb->sk);
Patrick McHardye5dfb812008-01-31 18:37:42 -080071}
72
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000073static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -080074{
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000075 if (flow->dst)
76 return ntohl(flow->dst);
Changli Gao4b95c3d2010-08-04 04:48:12 +000077 return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
Patrick McHardye5dfb812008-01-31 18:37:42 -080078}
79
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000080static u32 flow_get_proto(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -080081{
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000082 return flow->ip_proto;
Patrick McHardye5dfb812008-01-31 18:37:42 -080083}
84
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000085static u32 flow_get_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -080086{
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000087 if (flow->ports)
88 return ntohs(flow->port16[0]);
Eric Dumazet859c2012011-10-23 17:59:41 +000089
Changli Gao4b95c3d2010-08-04 04:48:12 +000090 return addr_fold(skb->sk);
Patrick McHardye5dfb812008-01-31 18:37:42 -080091}
92
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000093static u32 flow_get_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -080094{
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +000095 if (flow->ports)
96 return ntohs(flow->port16[1]);
Patrick McHardye5dfb812008-01-31 18:37:42 -080097
Changli Gao4b95c3d2010-08-04 04:48:12 +000098 return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
Patrick McHardye5dfb812008-01-31 18:37:42 -080099}
100
101static u32 flow_get_iif(const struct sk_buff *skb)
102{
Eric Dumazet8964be42009-11-20 15:35:04 -0800103 return skb->skb_iif;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800104}
105
106static u32 flow_get_priority(const struct sk_buff *skb)
107{
108 return skb->priority;
109}
110
111static u32 flow_get_mark(const struct sk_buff *skb)
112{
113 return skb->mark;
114}
115
116static u32 flow_get_nfct(const struct sk_buff *skb)
117{
118#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
119 return addr_fold(skb->nfct);
120#else
121 return 0;
122#endif
123}
124
125#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
126#define CTTUPLE(skb, member) \
127({ \
128 enum ip_conntrack_info ctinfo; \
Eric Dumazet859c2012011-10-23 17:59:41 +0000129 const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
Patrick McHardye5dfb812008-01-31 18:37:42 -0800130 if (ct == NULL) \
131 goto fallback; \
132 ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \
133})
134#else
135#define CTTUPLE(skb, member) \
136({ \
137 goto fallback; \
138 0; \
139})
140#endif
141
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000142static u32 flow_get_nfct_src(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -0800143{
144 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700145 case htons(ETH_P_IP):
Patrick McHardye5dfb812008-01-31 18:37:42 -0800146 return ntohl(CTTUPLE(skb, src.u3.ip));
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700147 case htons(ETH_P_IPV6):
Patrick McHardye5dfb812008-01-31 18:37:42 -0800148 return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
149 }
150fallback:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000151 return flow_get_src(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800152}
153
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000154static u32 flow_get_nfct_dst(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -0800155{
156 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700157 case htons(ETH_P_IP):
Patrick McHardye5dfb812008-01-31 18:37:42 -0800158 return ntohl(CTTUPLE(skb, dst.u3.ip));
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700159 case htons(ETH_P_IPV6):
Patrick McHardye5dfb812008-01-31 18:37:42 -0800160 return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
161 }
162fallback:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000163 return flow_get_dst(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800164}
165
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000166static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -0800167{
168 return ntohs(CTTUPLE(skb, src.u.all));
169fallback:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000170 return flow_get_proto_src(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800171}
172
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000173static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -0800174{
175 return ntohs(CTTUPLE(skb, dst.u.all));
176fallback:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000177 return flow_get_proto_dst(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800178}
179
180static u32 flow_get_rtclassid(const struct sk_buff *skb)
181{
Patrick McHardyc7066f72011-01-14 13:36:42 +0100182#ifdef CONFIG_IP_ROUTE_CLASSID
Eric Dumazetadf30902009-06-02 05:19:30 +0000183 if (skb_dst(skb))
184 return skb_dst(skb)->tclassid;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800185#endif
186 return 0;
187}
188
189static u32 flow_get_skuid(const struct sk_buff *skb)
190{
Eric W. Biedermana6c67962012-05-25 13:49:36 -0600191 if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) {
192 kuid_t skuid = skb->sk->sk_socket->file->f_cred->fsuid;
193 return from_kuid(&init_user_ns, skuid);
194 }
Patrick McHardye5dfb812008-01-31 18:37:42 -0800195 return 0;
196}
197
198static u32 flow_get_skgid(const struct sk_buff *skb)
199{
Eric W. Biedermana6c67962012-05-25 13:49:36 -0600200 if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) {
201 kgid_t skgid = skb->sk->sk_socket->file->f_cred->fsgid;
202 return from_kgid(&init_user_ns, skgid);
203 }
Patrick McHardye5dfb812008-01-31 18:37:42 -0800204 return 0;
205}
206
Patrick McHardy9ec13812008-02-05 16:21:04 -0800207static u32 flow_get_vlan_tag(const struct sk_buff *skb)
208{
209 u16 uninitialized_var(tag);
210
211 if (vlan_get_tag(skb, &tag) < 0)
212 return 0;
213 return tag & VLAN_VID_MASK;
214}
215
Changli Gao739a91e2010-08-21 06:23:15 +0000216static u32 flow_get_rxhash(struct sk_buff *skb)
217{
Tom Herbert3958afa1b2013-12-15 22:12:06 -0800218 return skb_get_hash(skb);
Changli Gao739a91e2010-08-21 06:23:15 +0000219}
220
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000221static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
Patrick McHardye5dfb812008-01-31 18:37:42 -0800222{
223 switch (key) {
224 case FLOW_KEY_SRC:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000225 return flow_get_src(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800226 case FLOW_KEY_DST:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000227 return flow_get_dst(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800228 case FLOW_KEY_PROTO:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000229 return flow_get_proto(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800230 case FLOW_KEY_PROTO_SRC:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000231 return flow_get_proto_src(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800232 case FLOW_KEY_PROTO_DST:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000233 return flow_get_proto_dst(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800234 case FLOW_KEY_IIF:
235 return flow_get_iif(skb);
236 case FLOW_KEY_PRIORITY:
237 return flow_get_priority(skb);
238 case FLOW_KEY_MARK:
239 return flow_get_mark(skb);
240 case FLOW_KEY_NFCT:
241 return flow_get_nfct(skb);
242 case FLOW_KEY_NFCT_SRC:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000243 return flow_get_nfct_src(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800244 case FLOW_KEY_NFCT_DST:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000245 return flow_get_nfct_dst(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800246 case FLOW_KEY_NFCT_PROTO_SRC:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000247 return flow_get_nfct_proto_src(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800248 case FLOW_KEY_NFCT_PROTO_DST:
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000249 return flow_get_nfct_proto_dst(skb, flow);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800250 case FLOW_KEY_RTCLASSID:
251 return flow_get_rtclassid(skb);
252 case FLOW_KEY_SKUID:
253 return flow_get_skuid(skb);
254 case FLOW_KEY_SKGID:
255 return flow_get_skgid(skb);
Patrick McHardy9ec13812008-02-05 16:21:04 -0800256 case FLOW_KEY_VLAN_TAG:
257 return flow_get_vlan_tag(skb);
Changli Gao739a91e2010-08-21 06:23:15 +0000258 case FLOW_KEY_RXHASH:
259 return flow_get_rxhash(skb);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800260 default:
261 WARN_ON(1);
262 return 0;
263 }
264}
265
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000266#define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \
267 (1 << FLOW_KEY_DST) | \
268 (1 << FLOW_KEY_PROTO) | \
269 (1 << FLOW_KEY_PROTO_SRC) | \
270 (1 << FLOW_KEY_PROTO_DST) | \
271 (1 << FLOW_KEY_NFCT_SRC) | \
272 (1 << FLOW_KEY_NFCT_DST) | \
273 (1 << FLOW_KEY_NFCT_PROTO_SRC) | \
274 (1 << FLOW_KEY_NFCT_PROTO_DST))
275
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000276static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
Patrick McHardye5dfb812008-01-31 18:37:42 -0800277 struct tcf_result *res)
278{
279 struct flow_head *head = tp->root;
280 struct flow_filter *f;
281 u32 keymask;
282 u32 classid;
283 unsigned int n, key;
284 int r;
285
286 list_for_each_entry(f, &head->filters, list) {
Eric Dumazet3a539432011-12-14 02:30:00 +0000287 u32 keys[FLOW_KEY_MAX + 1];
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000288 struct flow_keys flow_keys;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800289
290 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
291 continue;
292
293 keymask = f->keymask;
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000294 if (keymask & FLOW_KEYS_NEEDED)
295 skb_flow_dissect(skb, &flow_keys);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800296
297 for (n = 0; n < f->nkeys; n++) {
298 key = ffs(keymask) - 1;
299 keymask &= ~(1 << key);
Eric Dumazet6bd2a9a2011-11-28 05:24:18 +0000300 keys[n] = flow_key_get(skb, key, &flow_keys);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800301 }
302
303 if (f->mode == FLOW_MODE_HASH)
Patrick McHardy72d97942008-07-14 20:36:32 -0700304 classid = jhash2(keys, f->nkeys, f->hashrnd);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800305 else {
306 classid = keys[0];
307 classid = (classid & f->mask) ^ f->xor;
308 classid = (classid >> f->rshift) + f->addend;
309 }
310
311 if (f->divisor)
312 classid %= f->divisor;
313
314 res->class = 0;
315 res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
316
317 r = tcf_exts_exec(skb, &f->exts, res);
318 if (r < 0)
319 continue;
320 return r;
321 }
322 return -1;
323}
324
Patrick McHardy72d97942008-07-14 20:36:32 -0700325static void flow_perturbation(unsigned long arg)
326{
327 struct flow_filter *f = (struct flow_filter *)arg;
328
329 get_random_bytes(&f->hashrnd, 4);
330 if (f->perturb_period)
331 mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
332}
333
Patrick McHardye5dfb812008-01-31 18:37:42 -0800334static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
335 [TCA_FLOW_KEYS] = { .type = NLA_U32 },
336 [TCA_FLOW_MODE] = { .type = NLA_U32 },
337 [TCA_FLOW_BASECLASS] = { .type = NLA_U32 },
338 [TCA_FLOW_RSHIFT] = { .type = NLA_U32 },
339 [TCA_FLOW_ADDEND] = { .type = NLA_U32 },
340 [TCA_FLOW_MASK] = { .type = NLA_U32 },
341 [TCA_FLOW_XOR] = { .type = NLA_U32 },
342 [TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
343 [TCA_FLOW_ACT] = { .type = NLA_NESTED },
344 [TCA_FLOW_POLICE] = { .type = NLA_NESTED },
345 [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
Patrick McHardy72d97942008-07-14 20:36:32 -0700346 [TCA_FLOW_PERTURB] = { .type = NLA_U32 },
Patrick McHardye5dfb812008-01-31 18:37:42 -0800347};
348
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000349static int flow_change(struct net *net, struct sk_buff *in_skb,
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600350 struct tcf_proto *tp, unsigned long base,
Patrick McHardye5dfb812008-01-31 18:37:42 -0800351 u32 handle, struct nlattr **tca,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700352 unsigned long *arg, bool ovr)
Patrick McHardye5dfb812008-01-31 18:37:42 -0800353{
354 struct flow_head *head = tp->root;
355 struct flow_filter *f;
356 struct nlattr *opt = tca[TCA_OPTIONS];
357 struct nlattr *tb[TCA_FLOW_MAX + 1];
358 struct tcf_exts e;
359 struct tcf_ematch_tree t;
360 unsigned int nkeys = 0;
Patrick McHardy72d97942008-07-14 20:36:32 -0700361 unsigned int perturb_period = 0;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800362 u32 baseclass = 0;
363 u32 keymask = 0;
364 u32 mode;
365 int err;
366
367 if (opt == NULL)
368 return -EINVAL;
369
370 err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
371 if (err < 0)
372 return err;
373
374 if (tb[TCA_FLOW_BASECLASS]) {
375 baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
376 if (TC_H_MIN(baseclass) == 0)
377 return -EINVAL;
378 }
379
380 if (tb[TCA_FLOW_KEYS]) {
381 keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800382
383 nkeys = hweight32(keymask);
384 if (nkeys == 0)
385 return -EINVAL;
Patrick McHardy4f250492008-02-05 16:19:59 -0800386
387 if (fls(keymask) - 1 > FLOW_KEY_MAX)
388 return -EOPNOTSUPP;
Eric W. Biedermana6c67962012-05-25 13:49:36 -0600389
390 if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
Patrick McHardye32123e2013-04-17 06:46:57 +0000391 sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
Eric W. Biedermana6c67962012-05-25 13:49:36 -0600392 return -EOPNOTSUPP;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800393 }
394
WANG Cong5da57f42013-12-15 20:15:07 -0800395 tcf_exts_init(&e, TCA_FLOW_ACT, TCA_FLOW_POLICE);
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700396 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800397 if (err < 0)
398 return err;
399
400 err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
401 if (err < 0)
402 goto err1;
403
404 f = (struct flow_filter *)*arg;
405 if (f != NULL) {
406 err = -EINVAL;
407 if (f->handle != handle && handle)
408 goto err2;
409
410 mode = f->mode;
411 if (tb[TCA_FLOW_MODE])
412 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
413 if (mode != FLOW_MODE_HASH && nkeys > 1)
414 goto err2;
Patrick McHardy72d97942008-07-14 20:36:32 -0700415
416 if (mode == FLOW_MODE_HASH)
417 perturb_period = f->perturb_period;
418 if (tb[TCA_FLOW_PERTURB]) {
419 if (mode != FLOW_MODE_HASH)
420 goto err2;
421 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
422 }
Patrick McHardye5dfb812008-01-31 18:37:42 -0800423 } else {
424 err = -EINVAL;
425 if (!handle)
426 goto err2;
427 if (!tb[TCA_FLOW_KEYS])
428 goto err2;
429
430 mode = FLOW_MODE_MAP;
431 if (tb[TCA_FLOW_MODE])
432 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
433 if (mode != FLOW_MODE_HASH && nkeys > 1)
434 goto err2;
435
Patrick McHardy72d97942008-07-14 20:36:32 -0700436 if (tb[TCA_FLOW_PERTURB]) {
437 if (mode != FLOW_MODE_HASH)
438 goto err2;
439 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
440 }
441
Patrick McHardye5dfb812008-01-31 18:37:42 -0800442 if (TC_H_MAJ(baseclass) == 0)
443 baseclass = TC_H_MAKE(tp->q->handle, baseclass);
444 if (TC_H_MIN(baseclass) == 0)
445 baseclass = TC_H_MAKE(baseclass, 1);
446
447 err = -ENOBUFS;
448 f = kzalloc(sizeof(*f), GFP_KERNEL);
449 if (f == NULL)
450 goto err2;
451
452 f->handle = handle;
453 f->mask = ~0U;
WANG Cong5da57f42013-12-15 20:15:07 -0800454 tcf_exts_init(&f->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE);
Patrick McHardy72d97942008-07-14 20:36:32 -0700455
456 get_random_bytes(&f->hashrnd, 4);
457 f->perturb_timer.function = flow_perturbation;
458 f->perturb_timer.data = (unsigned long)f;
459 init_timer_deferrable(&f->perturb_timer);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800460 }
461
462 tcf_exts_change(tp, &f->exts, &e);
463 tcf_em_tree_change(tp, &f->ematches, &t);
464
465 tcf_tree_lock(tp);
466
467 if (tb[TCA_FLOW_KEYS]) {
468 f->keymask = keymask;
469 f->nkeys = nkeys;
470 }
471
472 f->mode = mode;
473
474 if (tb[TCA_FLOW_MASK])
475 f->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
476 if (tb[TCA_FLOW_XOR])
477 f->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
478 if (tb[TCA_FLOW_RSHIFT])
479 f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
480 if (tb[TCA_FLOW_ADDEND])
481 f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
482
483 if (tb[TCA_FLOW_DIVISOR])
484 f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
485 if (baseclass)
486 f->baseclass = baseclass;
487
Patrick McHardy72d97942008-07-14 20:36:32 -0700488 f->perturb_period = perturb_period;
489 del_timer(&f->perturb_timer);
490 if (perturb_period)
491 mod_timer(&f->perturb_timer, jiffies + perturb_period);
492
Patrick McHardye5dfb812008-01-31 18:37:42 -0800493 if (*arg == 0)
494 list_add_tail(&f->list, &head->filters);
495
496 tcf_tree_unlock(tp);
497
498 *arg = (unsigned long)f;
499 return 0;
500
501err2:
502 tcf_em_tree_destroy(tp, &t);
503err1:
504 tcf_exts_destroy(tp, &e);
505 return err;
506}
507
508static void flow_destroy_filter(struct tcf_proto *tp, struct flow_filter *f)
509{
Patrick McHardy72d97942008-07-14 20:36:32 -0700510 del_timer_sync(&f->perturb_timer);
Patrick McHardye5dfb812008-01-31 18:37:42 -0800511 tcf_exts_destroy(tp, &f->exts);
512 tcf_em_tree_destroy(tp, &f->ematches);
513 kfree(f);
514}
515
516static int flow_delete(struct tcf_proto *tp, unsigned long arg)
517{
518 struct flow_filter *f = (struct flow_filter *)arg;
519
520 tcf_tree_lock(tp);
521 list_del(&f->list);
522 tcf_tree_unlock(tp);
523 flow_destroy_filter(tp, f);
524 return 0;
525}
526
527static int flow_init(struct tcf_proto *tp)
528{
529 struct flow_head *head;
530
Patrick McHardye5dfb812008-01-31 18:37:42 -0800531 head = kzalloc(sizeof(*head), GFP_KERNEL);
532 if (head == NULL)
533 return -ENOBUFS;
534 INIT_LIST_HEAD(&head->filters);
535 tp->root = head;
536 return 0;
537}
538
539static void flow_destroy(struct tcf_proto *tp)
540{
541 struct flow_head *head = tp->root;
542 struct flow_filter *f, *next;
543
544 list_for_each_entry_safe(f, next, &head->filters, list) {
545 list_del(&f->list);
546 flow_destroy_filter(tp, f);
547 }
548 kfree(head);
549}
550
551static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
552{
553 struct flow_head *head = tp->root;
554 struct flow_filter *f;
555
556 list_for_each_entry(f, &head->filters, list)
557 if (f->handle == handle)
558 return (unsigned long)f;
559 return 0;
560}
561
562static void flow_put(struct tcf_proto *tp, unsigned long f)
563{
Patrick McHardye5dfb812008-01-31 18:37:42 -0800564}
565
WANG Cong832d1d52014-01-09 16:14:01 -0800566static int flow_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
Patrick McHardye5dfb812008-01-31 18:37:42 -0800567 struct sk_buff *skb, struct tcmsg *t)
568{
569 struct flow_filter *f = (struct flow_filter *)fh;
570 struct nlattr *nest;
571
572 if (f == NULL)
573 return skb->len;
574
575 t->tcm_handle = f->handle;
576
577 nest = nla_nest_start(skb, TCA_OPTIONS);
578 if (nest == NULL)
579 goto nla_put_failure;
580
David S. Miller1b34ec42012-03-29 05:11:39 -0400581 if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
582 nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
583 goto nla_put_failure;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800584
585 if (f->mask != ~0 || f->xor != 0) {
David S. Miller1b34ec42012-03-29 05:11:39 -0400586 if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
587 nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
588 goto nla_put_failure;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800589 }
David S. Miller1b34ec42012-03-29 05:11:39 -0400590 if (f->rshift &&
591 nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
592 goto nla_put_failure;
593 if (f->addend &&
594 nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
595 goto nla_put_failure;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800596
David S. Miller1b34ec42012-03-29 05:11:39 -0400597 if (f->divisor &&
598 nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
599 goto nla_put_failure;
600 if (f->baseclass &&
601 nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
602 goto nla_put_failure;
Patrick McHardye5dfb812008-01-31 18:37:42 -0800603
David S. Miller1b34ec42012-03-29 05:11:39 -0400604 if (f->perturb_period &&
605 nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
606 goto nla_put_failure;
Patrick McHardy72d97942008-07-14 20:36:32 -0700607
WANG Cong5da57f42013-12-15 20:15:07 -0800608 if (tcf_exts_dump(skb, &f->exts) < 0)
Patrick McHardye5dfb812008-01-31 18:37:42 -0800609 goto nla_put_failure;
Rami Rosen0aead542008-02-05 02:56:48 -0800610#ifdef CONFIG_NET_EMATCH
Patrick McHardye5dfb812008-01-31 18:37:42 -0800611 if (f->ematches.hdr.nmatches &&
612 tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
613 goto nla_put_failure;
Rami Rosen0aead542008-02-05 02:56:48 -0800614#endif
Patrick McHardye5dfb812008-01-31 18:37:42 -0800615 nla_nest_end(skb, nest);
616
WANG Cong5da57f42013-12-15 20:15:07 -0800617 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
Patrick McHardye5dfb812008-01-31 18:37:42 -0800618 goto nla_put_failure;
619
620 return skb->len;
621
622nla_put_failure:
623 nlmsg_trim(skb, nest);
624 return -1;
625}
626
627static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
628{
629 struct flow_head *head = tp->root;
630 struct flow_filter *f;
631
632 list_for_each_entry(f, &head->filters, list) {
633 if (arg->count < arg->skip)
634 goto skip;
635 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
636 arg->stop = 1;
637 break;
638 }
639skip:
640 arg->count++;
641 }
642}
643
644static struct tcf_proto_ops cls_flow_ops __read_mostly = {
645 .kind = "flow",
646 .classify = flow_classify,
647 .init = flow_init,
648 .destroy = flow_destroy,
649 .change = flow_change,
650 .delete = flow_delete,
651 .get = flow_get,
652 .put = flow_put,
653 .dump = flow_dump,
654 .walk = flow_walk,
655 .owner = THIS_MODULE,
656};
657
658static int __init cls_flow_init(void)
659{
660 return register_tcf_proto_ops(&cls_flow_ops);
661}
662
663static void __exit cls_flow_exit(void)
664{
665 unregister_tcf_proto_ops(&cls_flow_ops);
666}
667
668module_init(cls_flow_init);
669module_exit(cls_flow_exit);
670
671MODULE_LICENSE("GPL");
672MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
673MODULE_DESCRIPTION("TC flow classifier");