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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>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070020#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <net/pkt_sched.h>
22#include <linux/tc_act/tc_pedit.h>
23#include <net/tc_act/tc_pedit.h>
24
David S. Millere9ce1cd2006-08-21 23:54:55 -070025#define PEDIT_TAB_MASK 15
26static struct tcf_common *tcf_pedit_ht[PEDIT_TAB_MASK + 1];
27static u32 pedit_idx_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028static DEFINE_RWLOCK(pedit_lock);
29
David S. Millere9ce1cd2006-08-21 23:54:55 -070030static struct tcf_hashinfo pedit_hash_info = {
31 .htab = tcf_pedit_ht,
32 .hmask = PEDIT_TAB_MASK,
33 .lock = &pedit_lock,
34};
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Patrick McHardy53b2bf32008-01-23 20:36:30 -080036static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
37 [TCA_PEDIT_PARMS] = { .len = sizeof(struct tcf_pedit) },
38};
39
Patrick McHardy7ba699c2008-01-22 22:11:50 -080040static int tcf_pedit_init(struct nlattr *nla, struct nlattr *est,
David S. Millere9ce1cd2006-08-21 23:54:55 -070041 struct tc_action *a, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
Patrick McHardy7ba699c2008-01-22 22:11:50 -080043 struct nlattr *tb[TCA_PEDIT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 struct tc_pedit *parm;
Patrick McHardycee63722008-01-23 20:33:32 -080045 int ret = 0, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 struct tcf_pedit *p;
David S. Millere9ce1cd2006-08-21 23:54:55 -070047 struct tcf_common *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 struct tc_pedit_key *keys = NULL;
49 int ksize;
50
Patrick McHardycee63722008-01-23 20:33:32 -080051 if (nla == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return -EINVAL;
53
Patrick McHardy53b2bf32008-01-23 20:36:30 -080054 err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy);
Patrick McHardycee63722008-01-23 20:33:32 -080055 if (err < 0)
56 return err;
57
Patrick McHardy53b2bf32008-01-23 20:36:30 -080058 if (tb[TCA_PEDIT_PARMS] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 return -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -080060 parm = nla_data(tb[TCA_PEDIT_PARMS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 ksize = parm->nkeys * sizeof(struct tc_pedit_key);
Patrick McHardy7ba699c2008-01-22 22:11:50 -080062 if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 return -EINVAL;
64
David S. Millere9ce1cd2006-08-21 23:54:55 -070065 pc = tcf_hash_check(parm->index, a, bind, &pedit_hash_info);
66 if (!pc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 if (!parm->nkeys)
68 return -EINVAL;
David S. Millere9ce1cd2006-08-21 23:54:55 -070069 pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind,
70 &pedit_idx_gen, &pedit_hash_info);
71 if (unlikely(!pc))
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 return -ENOMEM;
David S. Millere9ce1cd2006-08-21 23:54:55 -070073 p = to_pedit(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 keys = kmalloc(ksize, GFP_KERNEL);
75 if (keys == NULL) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070076 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 return -ENOMEM;
78 }
79 ret = ACT_P_CREATED;
80 } else {
David S. Millere9ce1cd2006-08-21 23:54:55 -070081 p = to_pedit(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 if (!ovr) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070083 tcf_hash_release(pc, bind, &pedit_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 return -EEXIST;
85 }
David S. Millere9ce1cd2006-08-21 23:54:55 -070086 if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 keys = kmalloc(ksize, GFP_KERNEL);
88 if (keys == NULL)
89 return -ENOMEM;
90 }
91 }
92
David S. Millere9ce1cd2006-08-21 23:54:55 -070093 spin_lock_bh(&p->tcf_lock);
94 p->tcfp_flags = parm->flags;
95 p->tcf_action = parm->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 if (keys) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070097 kfree(p->tcfp_keys);
98 p->tcfp_keys = keys;
99 p->tcfp_nkeys = parm->nkeys;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700101 memcpy(p->tcfp_keys, parm->keys, ksize);
102 spin_unlock_bh(&p->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (ret == ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700104 tcf_hash_insert(pc, &pedit_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 return ret;
106}
107
David S. Millere9ce1cd2006-08-21 23:54:55 -0700108static int tcf_pedit_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700110 struct tcf_pedit *p = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
David S. Millere9ce1cd2006-08-21 23:54:55 -0700112 if (p) {
113 struct tc_pedit_key *keys = p->tcfp_keys;
114 if (tcf_hash_release(&p->common, bind, &pedit_hash_info)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 kfree(keys);
116 return 1;
117 }
118 }
119 return 0;
120}
121
David S. Millere9ce1cd2006-08-21 23:54:55 -0700122static int tcf_pedit(struct sk_buff *skb, struct tc_action *a,
123 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700125 struct tcf_pedit *p = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 int i, munged = 0;
127 u8 *pptr;
128
129 if (!(skb->tc_verd & TC_OK2MUNGE)) {
130 /* should we set skb->cloned? */
131 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
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700136 pptr = skb_network_header(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++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 u32 *ptr;
147 int offset = tkey->off;
148
149 if (tkey->offmask) {
150 if (skb->len > tkey->at) {
151 char *j = pptr + tkey->at;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900152 offset += ((*j & tkey->offmask) >>
153 tkey->shift);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 } else {
155 goto bad;
156 }
157 }
158
159 if (offset % 4) {
160 printk("offset must be on 32 bit boundaries\n");
161 goto bad;
162 }
Bill Nottingham75202e72007-05-31 21:33:35 -0700163 if (offset > 0 && offset > skb->len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 printk("offset %d cant exceed pkt length %d\n",
165 offset, skb->len);
166 goto bad;
167 }
168
169 ptr = (u32 *)(pptr+offset);
170 /* just do it, baby */
171 *ptr = ((*ptr & tkey->mask) ^ tkey->val);
172 munged++;
173 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (munged)
176 skb->tc_verd = SET_TC_MUNGED(skb->tc_verd);
177 goto done;
178 } else {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700179 printk("pedit BUG: index %d\n", p->tcf_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
181
182bad:
David S. Millere9ce1cd2006-08-21 23:54:55 -0700183 p->tcf_qstats.overlimits++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184done:
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700185 p->tcf_bstats.bytes += qdisc_pkt_len(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700186 p->tcf_bstats.packets++;
187 spin_unlock(&p->tcf_lock);
188 return p->tcf_action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189}
190
David S. Millere9ce1cd2006-08-21 23:54:55 -0700191static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
192 int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700194 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700195 struct tcf_pedit *p = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 struct tc_pedit *opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 struct tcf_t t;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900198 int s;
199
David S. Millere9ce1cd2006-08-21 23:54:55 -0700200 s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 /* netlink spinlocks held above us - must use ATOMIC */
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700203 opt = kzalloc(s, GFP_ATOMIC);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700204 if (unlikely(!opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
David S. Millere9ce1cd2006-08-21 23:54:55 -0700207 memcpy(opt->keys, p->tcfp_keys,
208 p->tcfp_nkeys * sizeof(struct tc_pedit_key));
209 opt->index = p->tcf_index;
210 opt->nkeys = p->tcfp_nkeys;
211 opt->flags = p->tcfp_flags;
212 opt->action = p->tcf_action;
213 opt->refcnt = p->tcf_refcnt - ref;
214 opt->bindcnt = p->tcf_bindcnt - bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800216 NLA_PUT(skb, TCA_PEDIT_PARMS, s, opt);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700217 t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
218 t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
219 t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800220 NLA_PUT(skb, TCA_PEDIT_TM, sizeof(t), &t);
Patrick McHardy541673c82006-01-08 22:17:27 -0800221 kfree(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 return skb->len;
223
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800224nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700225 nlmsg_trim(skb, b);
Patrick McHardy541673c82006-01-08 22:17:27 -0800226 kfree(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return -1;
228}
229
David S. Millere9ce1cd2006-08-21 23:54:55 -0700230static struct tc_action_ops act_pedit_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 .kind = "pedit",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700232 .hinfo = &pedit_hash_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 .type = TCA_ACT_PEDIT,
234 .capab = TCA_CAP_NONE,
235 .owner = THIS_MODULE,
236 .act = tcf_pedit,
237 .dump = tcf_pedit_dump,
238 .cleanup = tcf_pedit_cleanup,
239 .lookup = tcf_hash_search,
240 .init = tcf_pedit_init,
241 .walk = tcf_generic_walker
242};
243
244MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
245MODULE_DESCRIPTION("Generic Packet Editor actions");
246MODULE_LICENSE("GPL");
247
David S. Millere9ce1cd2006-08-21 23:54:55 -0700248static int __init pedit_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
250 return tcf_register_action(&act_pedit_ops);
251}
252
David S. Millere9ce1cd2006-08-21 23:54:55 -0700253static void __exit pedit_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
255 tcf_unregister_action(&act_pedit_ops);
256}
257
258module_init(pedit_init_module);
259module_exit(pedit_cleanup_module);
260