blob: a0593c9640db1def9adbd1ce1483973dfb300c4c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/pedit.c Generic packet editor
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Jamal Hadi Salim (2002-4)
10 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/types.h>
13#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/skbuff.h>
17#include <linux/rtnetlink.h>
18#include <linux/module.h>
19#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070021#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <net/pkt_sched.h>
23#include <linux/tc_act/tc_pedit.h>
24#include <net/tc_act/tc_pedit.h>
25
David S. Millere9ce1cd2006-08-21 23:54:55 -070026#define PEDIT_TAB_MASK 15
27static struct tcf_common *tcf_pedit_ht[PEDIT_TAB_MASK + 1];
28static u32 pedit_idx_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029static DEFINE_RWLOCK(pedit_lock);
30
David S. Millere9ce1cd2006-08-21 23:54:55 -070031static struct tcf_hashinfo pedit_hash_info = {
32 .htab = tcf_pedit_ht,
33 .hmask = PEDIT_TAB_MASK,
34 .lock = &pedit_lock,
35};
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Patrick McHardy53b2bf32008-01-23 20:36:30 -080037static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
jamal53f7e352009-10-11 04:21:38 +000038 [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
Patrick McHardy53b2bf32008-01-23 20:36:30 -080039};
40
Patrick McHardy7ba699c2008-01-22 22:11:50 -080041static int tcf_pedit_init(struct nlattr *nla, struct nlattr *est,
David S. Millere9ce1cd2006-08-21 23:54:55 -070042 struct tc_action *a, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Patrick McHardy7ba699c2008-01-22 22:11:50 -080044 struct nlattr *tb[TCA_PEDIT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 struct tc_pedit *parm;
Patrick McHardycee63722008-01-23 20:33:32 -080046 int ret = 0, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 struct tcf_pedit *p;
David S. Millere9ce1cd2006-08-21 23:54:55 -070048 struct tcf_common *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 struct tc_pedit_key *keys = NULL;
50 int ksize;
51
Patrick McHardycee63722008-01-23 20:33:32 -080052 if (nla == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 return -EINVAL;
54
Patrick McHardy53b2bf32008-01-23 20:36:30 -080055 err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy);
Patrick McHardycee63722008-01-23 20:33:32 -080056 if (err < 0)
57 return err;
58
Patrick McHardy53b2bf32008-01-23 20:36:30 -080059 if (tb[TCA_PEDIT_PARMS] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -080061 parm = nla_data(tb[TCA_PEDIT_PARMS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 ksize = parm->nkeys * sizeof(struct tc_pedit_key);
Patrick McHardy7ba699c2008-01-22 22:11:50 -080063 if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 return -EINVAL;
65
David S. Millere9ce1cd2006-08-21 23:54:55 -070066 pc = tcf_hash_check(parm->index, a, bind, &pedit_hash_info);
67 if (!pc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 if (!parm->nkeys)
69 return -EINVAL;
David S. Millere9ce1cd2006-08-21 23:54:55 -070070 pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind,
71 &pedit_idx_gen, &pedit_hash_info);
Stephen Hemminger0e991ec2008-11-25 21:12:32 -080072 if (IS_ERR(pc))
73 return PTR_ERR(pc);
David S. Millere9ce1cd2006-08-21 23:54:55 -070074 p = to_pedit(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 keys = kmalloc(ksize, GFP_KERNEL);
76 if (keys == NULL) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070077 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 return -ENOMEM;
79 }
80 ret = ACT_P_CREATED;
81 } else {
David S. Millere9ce1cd2006-08-21 23:54:55 -070082 p = to_pedit(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 if (!ovr) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070084 tcf_hash_release(pc, bind, &pedit_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 return -EEXIST;
86 }
David S. Millere9ce1cd2006-08-21 23:54:55 -070087 if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 keys = kmalloc(ksize, GFP_KERNEL);
89 if (keys == NULL)
90 return -ENOMEM;
91 }
92 }
93
David S. Millere9ce1cd2006-08-21 23:54:55 -070094 spin_lock_bh(&p->tcf_lock);
95 p->tcfp_flags = parm->flags;
96 p->tcf_action = parm->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 if (keys) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070098 kfree(p->tcfp_keys);
99 p->tcfp_keys = keys;
100 p->tcfp_nkeys = parm->nkeys;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700102 memcpy(p->tcfp_keys, parm->keys, ksize);
103 spin_unlock_bh(&p->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 if (ret == ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700105 tcf_hash_insert(pc, &pedit_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return ret;
107}
108
David S. Millere9ce1cd2006-08-21 23:54:55 -0700109static int tcf_pedit_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700111 struct tcf_pedit *p = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
David S. Millere9ce1cd2006-08-21 23:54:55 -0700113 if (p) {
114 struct tc_pedit_key *keys = p->tcfp_keys;
115 if (tcf_hash_release(&p->common, bind, &pedit_hash_info)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 kfree(keys);
117 return 1;
118 }
119 }
120 return 0;
121}
122
David S. Millere9ce1cd2006-08-21 23:54:55 -0700123static int tcf_pedit(struct sk_buff *skb, struct tc_action *a,
124 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700126 struct tcf_pedit *p = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 int i, munged = 0;
Changli Gaodb2c2412010-06-02 04:55:02 +0000128 unsigned int off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
jamal9dacaf12010-06-04 02:43:06 +0000130 if (skb_cloned(skb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700132 return p->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 }
134 }
135
Changli Gaodb2c2412010-06-02 04:55:02 +0000136 off = skb_network_offset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
David S. Millere9ce1cd2006-08-21 23:54:55 -0700138 spin_lock(&p->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
David S. Millere9ce1cd2006-08-21 23:54:55 -0700140 p->tcf_tm.lastuse = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
David S. Millere9ce1cd2006-08-21 23:54:55 -0700142 if (p->tcfp_nkeys > 0) {
143 struct tc_pedit_key *tkey = p->tcfp_keys;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
David S. Millere9ce1cd2006-08-21 23:54:55 -0700145 for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
Changli Gaodb2c2412010-06-02 04:55:02 +0000146 u32 *ptr, _data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 int offset = tkey->off;
148
149 if (tkey->offmask) {
Changli Gaodb2c2412010-06-02 04:55:02 +0000150 char *d, _d;
151
152 d = skb_header_pointer(skb, off + tkey->at, 1,
153 &_d);
154 if (!d)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 goto bad;
Changli Gaodb2c2412010-06-02 04:55:02 +0000156 offset += (*d & tkey->offmask) >> tkey->shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
158
159 if (offset % 4) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000160 pr_info("tc filter pedit"
161 " offset must be on 32 bit boundaries\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 goto bad;
163 }
Bill Nottingham75202e72007-05-31 21:33:35 -0700164 if (offset > 0 && offset > skb->len) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000165 pr_info("tc filter pedit"
166 " offset %d cant exceed pkt length %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 offset, skb->len);
168 goto bad;
169 }
170
Changli Gaodb2c2412010-06-02 04:55:02 +0000171 ptr = skb_header_pointer(skb, off + offset, 4, &_data);
172 if (!ptr)
173 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 /* just do it, baby */
175 *ptr = ((*ptr & tkey->mask) ^ tkey->val);
Changli Gaodb2c2412010-06-02 04:55:02 +0000176 if (ptr == &_data)
177 skb_store_bits(skb, off + offset, ptr, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 munged++;
179 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (munged)
182 skb->tc_verd = SET_TC_MUNGED(skb->tc_verd);
183 goto done;
stephen hemminger6ff9c362010-05-12 06:37:05 +0000184 } else
185 WARN(1, "pedit BUG: index %d\n", p->tcf_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187bad:
David S. Millere9ce1cd2006-08-21 23:54:55 -0700188 p->tcf_qstats.overlimits++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189done:
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700190 p->tcf_bstats.bytes += qdisc_pkt_len(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700191 p->tcf_bstats.packets++;
192 spin_unlock(&p->tcf_lock);
193 return p->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
David S. Millere9ce1cd2006-08-21 23:54:55 -0700196static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
197 int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700199 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700200 struct tcf_pedit *p = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 struct tc_pedit *opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 struct tcf_t t;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900203 int s;
204
David S. Millere9ce1cd2006-08-21 23:54:55 -0700205 s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207 /* netlink spinlocks held above us - must use ATOMIC */
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700208 opt = kzalloc(s, GFP_ATOMIC);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700209 if (unlikely(!opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
David S. Millere9ce1cd2006-08-21 23:54:55 -0700212 memcpy(opt->keys, p->tcfp_keys,
213 p->tcfp_nkeys * sizeof(struct tc_pedit_key));
214 opt->index = p->tcf_index;
215 opt->nkeys = p->tcfp_nkeys;
216 opt->flags = p->tcfp_flags;
217 opt->action = p->tcf_action;
218 opt->refcnt = p->tcf_refcnt - ref;
219 opt->bindcnt = p->tcf_bindcnt - bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800221 NLA_PUT(skb, TCA_PEDIT_PARMS, s, opt);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700222 t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
223 t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
224 t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800225 NLA_PUT(skb, TCA_PEDIT_TM, sizeof(t), &t);
Patrick McHardy541673c82006-01-08 22:17:27 -0800226 kfree(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return skb->len;
228
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800229nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700230 nlmsg_trim(skb, b);
Patrick McHardy541673c82006-01-08 22:17:27 -0800231 kfree(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return -1;
233}
234
David S. Millere9ce1cd2006-08-21 23:54:55 -0700235static struct tc_action_ops act_pedit_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 .kind = "pedit",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700237 .hinfo = &pedit_hash_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 .type = TCA_ACT_PEDIT,
239 .capab = TCA_CAP_NONE,
240 .owner = THIS_MODULE,
241 .act = tcf_pedit,
242 .dump = tcf_pedit_dump,
243 .cleanup = tcf_pedit_cleanup,
244 .lookup = tcf_hash_search,
245 .init = tcf_pedit_init,
246 .walk = tcf_generic_walker
247};
248
249MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
250MODULE_DESCRIPTION("Generic Packet Editor actions");
251MODULE_LICENSE("GPL");
252
David S. Millere9ce1cd2006-08-21 23:54:55 -0700253static int __init pedit_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
255 return tcf_register_action(&act_pedit_ops);
256}
257
David S. Millere9ce1cd2006-08-21 23:54:55 -0700258static void __exit pedit_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259{
260 tcf_unregister_action(&act_pedit_ops);
261}
262
263module_init(pedit_init_module);
264module_exit(pedit_cleanup_module);
265