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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jiri Pirko0c6965d2014-11-05 20:51:51 +01002 * net/sched/act_pedit.c Generic packet editor
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Patrick McHardy53b2bf32008-01-23 20:36:30 -080028static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
jamal53f7e352009-10-11 04:21:38 +000029 [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
Patrick McHardy53b2bf32008-01-23 20:36:30 -080030};
31
Benjamin LaHaisec1b52732013-01-14 05:15:39 +000032static int tcf_pedit_init(struct net *net, struct nlattr *nla,
33 struct nlattr *est, struct tc_action *a,
34 int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
Patrick McHardy7ba699c2008-01-22 22:11:50 -080036 struct nlattr *tb[TCA_PEDIT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 struct tc_pedit *parm;
Patrick McHardycee63722008-01-23 20:33:32 -080038 int ret = 0, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 struct tcf_pedit *p;
40 struct tc_pedit_key *keys = NULL;
41 int ksize;
42
Patrick McHardycee63722008-01-23 20:33:32 -080043 if (nla == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 return -EINVAL;
45
Patrick McHardy53b2bf32008-01-23 20:36:30 -080046 err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy);
Patrick McHardycee63722008-01-23 20:33:32 -080047 if (err < 0)
48 return err;
49
Patrick McHardy53b2bf32008-01-23 20:36:30 -080050 if (tb[TCA_PEDIT_PARMS] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 return -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -080052 parm = nla_data(tb[TCA_PEDIT_PARMS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 ksize = parm->nkeys * sizeof(struct tc_pedit_key);
Patrick McHardy7ba699c2008-01-22 22:11:50 -080054 if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 return -EINVAL;
56
WANG Cong86062032014-02-11 17:07:31 -080057 if (!tcf_hash_check(parm->index, a, bind)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 if (!parm->nkeys)
59 return -EINVAL;
Eric Dumazet519c8182015-07-06 05:18:04 -070060 ret = tcf_hash_create(parm->index, est, a, sizeof(*p),
61 bind, false);
WANG Cong86062032014-02-11 17:07:31 -080062 if (ret)
63 return ret;
64 p = to_pedit(a);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 keys = kmalloc(ksize, GFP_KERNEL);
66 if (keys == NULL) {
WANG Cong86062032014-02-11 17:07:31 -080067 tcf_hash_cleanup(a, est);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 return -ENOMEM;
69 }
70 ret = ACT_P_CREATED;
71 } else {
Jamal Hadi Salim1a293212013-12-23 08:02:11 -050072 if (bind)
73 return 0;
WANG Cong5175f712015-07-30 17:12:21 -070074 tcf_hash_release(a, bind);
Jamal Hadi Salim1a293212013-12-23 08:02:11 -050075 if (!ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 return -EEXIST;
WANG Cong5175f712015-07-30 17:12:21 -070077 p = to_pedit(a);
David S. Millere9ce1cd2006-08-21 23:54:55 -070078 if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 keys = kmalloc(ksize, GFP_KERNEL);
80 if (keys == NULL)
81 return -ENOMEM;
82 }
83 }
84
David S. Millere9ce1cd2006-08-21 23:54:55 -070085 spin_lock_bh(&p->tcf_lock);
86 p->tcfp_flags = parm->flags;
87 p->tcf_action = parm->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 if (keys) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070089 kfree(p->tcfp_keys);
90 p->tcfp_keys = keys;
91 p->tcfp_nkeys = parm->nkeys;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 }
David S. Millere9ce1cd2006-08-21 23:54:55 -070093 memcpy(p->tcfp_keys, parm->keys, ksize);
94 spin_unlock_bh(&p->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 if (ret == ACT_P_CREATED)
WANG Cong86062032014-02-11 17:07:31 -080096 tcf_hash_insert(a);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 return ret;
98}
99
WANG Conga5b5c952014-02-11 17:07:32 -0800100static void tcf_pedit_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700102 struct tcf_pedit *p = a->priv;
WANG Conga5b5c952014-02-11 17:07:32 -0800103 struct tc_pedit_key *keys = p->tcfp_keys;
104 kfree(keys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000107static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700108 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700110 struct tcf_pedit *p = a->priv;
Florian Westphal4749c3ef2015-04-30 12:12:00 +0200111 int i;
Changli Gaodb2c2412010-06-02 04:55:02 +0000112 unsigned int off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Pravin B Shelar14bbd6a2013-02-14 09:44:49 +0000114 if (skb_unclone(skb, GFP_ATOMIC))
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000115 return p->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Changli Gaodb2c2412010-06-02 04:55:02 +0000117 off = skb_network_offset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
David S. Millere9ce1cd2006-08-21 23:54:55 -0700119 spin_lock(&p->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
David S. Millere9ce1cd2006-08-21 23:54:55 -0700121 p->tcf_tm.lastuse = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
David S. Millere9ce1cd2006-08-21 23:54:55 -0700123 if (p->tcfp_nkeys > 0) {
124 struct tc_pedit_key *tkey = p->tcfp_keys;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
David S. Millere9ce1cd2006-08-21 23:54:55 -0700126 for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
Changli Gaodb2c2412010-06-02 04:55:02 +0000127 u32 *ptr, _data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 int offset = tkey->off;
129
130 if (tkey->offmask) {
Changli Gaodb2c2412010-06-02 04:55:02 +0000131 char *d, _d;
132
133 d = skb_header_pointer(skb, off + tkey->at, 1,
134 &_d);
135 if (!d)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 goto bad;
Changli Gaodb2c2412010-06-02 04:55:02 +0000137 offset += (*d & tkey->offmask) >> tkey->shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 }
139
140 if (offset % 4) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000141 pr_info("tc filter pedit"
142 " offset must be on 32 bit boundaries\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 goto bad;
144 }
Bill Nottingham75202e72007-05-31 21:33:35 -0700145 if (offset > 0 && offset > skb->len) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000146 pr_info("tc filter pedit"
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300147 " offset %d can't exceed pkt length %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 offset, skb->len);
149 goto bad;
150 }
151
Changli Gaodb2c2412010-06-02 04:55:02 +0000152 ptr = skb_header_pointer(skb, off + offset, 4, &_data);
153 if (!ptr)
154 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 /* just do it, baby */
156 *ptr = ((*ptr & tkey->mask) ^ tkey->val);
Changli Gaodb2c2412010-06-02 04:55:02 +0000157 if (ptr == &_data)
158 skb_store_bits(skb, off + offset, ptr, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 goto done;
stephen hemminger6ff9c362010-05-12 06:37:05 +0000162 } else
163 WARN(1, "pedit BUG: index %d\n", p->tcf_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165bad:
David S. Millere9ce1cd2006-08-21 23:54:55 -0700166 p->tcf_qstats.overlimits++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167done:
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000168 bstats_update(&p->tcf_bstats, skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700169 spin_unlock(&p->tcf_lock);
170 return p->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
David S. Millere9ce1cd2006-08-21 23:54:55 -0700173static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
174 int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700176 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700177 struct tcf_pedit *p = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 struct tc_pedit *opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 struct tcf_t t;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900180 int s;
181
David S. Millere9ce1cd2006-08-21 23:54:55 -0700182 s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 /* netlink spinlocks held above us - must use ATOMIC */
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700185 opt = kzalloc(s, GFP_ATOMIC);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700186 if (unlikely(!opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
David S. Millere9ce1cd2006-08-21 23:54:55 -0700189 memcpy(opt->keys, p->tcfp_keys,
190 p->tcfp_nkeys * sizeof(struct tc_pedit_key));
191 opt->index = p->tcf_index;
192 opt->nkeys = p->tcfp_nkeys;
193 opt->flags = p->tcfp_flags;
194 opt->action = p->tcf_action;
195 opt->refcnt = p->tcf_refcnt - ref;
196 opt->bindcnt = p->tcf_bindcnt - bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
David S. Miller1b34ec42012-03-29 05:11:39 -0400198 if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
199 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700200 t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
201 t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
202 t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
David S. Miller1b34ec42012-03-29 05:11:39 -0400203 if (nla_put(skb, TCA_PEDIT_TM, sizeof(t), &t))
204 goto nla_put_failure;
Patrick McHardy541673c82006-01-08 22:17:27 -0800205 kfree(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 return skb->len;
207
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800208nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700209 nlmsg_trim(skb, b);
Patrick McHardy541673c82006-01-08 22:17:27 -0800210 kfree(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 return -1;
212}
213
David S. Millere9ce1cd2006-08-21 23:54:55 -0700214static struct tc_action_ops act_pedit_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 .kind = "pedit",
216 .type = TCA_ACT_PEDIT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 .owner = THIS_MODULE,
218 .act = tcf_pedit,
219 .dump = tcf_pedit_dump,
220 .cleanup = tcf_pedit_cleanup,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 .init = tcf_pedit_init,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222};
223
224MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
225MODULE_DESCRIPTION("Generic Packet Editor actions");
226MODULE_LICENSE("GPL");
227
David S. Millere9ce1cd2006-08-21 23:54:55 -0700228static int __init pedit_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
WANG Cong4f1e9d82014-02-11 17:07:33 -0800230 return tcf_register_action(&act_pedit_ops, PEDIT_TAB_MASK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231}
232
David S. Millere9ce1cd2006-08-21 23:54:55 -0700233static void __exit pedit_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 tcf_unregister_action(&act_pedit_ops);
236}
237
238module_init(pedit_init_module);
239module_exit(pedit_cleanup_module);
240