289 lines
6.3 KiB
C
289 lines
6.3 KiB
C
/*
|
|
* net/sched/pedit.c Generic packet editor
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Authors: Jamal Hadi Salim (2002-4)
|
|
*/
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
#include <asm/bitops.h>
|
|
#include <linux/config.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/sockios.h>
|
|
#include <linux/in.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <net/sock.h>
|
|
#include <net/pkt_sched.h>
|
|
#include <linux/tc_act/tc_pedit.h>
|
|
#include <net/tc_act/tc_pedit.h>
|
|
|
|
|
|
#define PEDIT_DEB 1
|
|
|
|
/* use generic hash table */
|
|
#define MY_TAB_SIZE 16
|
|
#define MY_TAB_MASK 15
|
|
static u32 idx_gen;
|
|
static struct tcf_pedit *tcf_pedit_ht[MY_TAB_SIZE];
|
|
static DEFINE_RWLOCK(pedit_lock);
|
|
|
|
#define tcf_st tcf_pedit
|
|
#define tc_st tc_pedit
|
|
#define tcf_t_lock pedit_lock
|
|
#define tcf_ht tcf_pedit_ht
|
|
|
|
#define CONFIG_NET_ACT_INIT 1
|
|
#include <net/pkt_act.h>
|
|
|
|
static int
|
|
tcf_pedit_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a,
|
|
int ovr, int bind)
|
|
{
|
|
struct rtattr *tb[TCA_PEDIT_MAX];
|
|
struct tc_pedit *parm;
|
|
int ret = 0;
|
|
struct tcf_pedit *p;
|
|
struct tc_pedit_key *keys = NULL;
|
|
int ksize;
|
|
|
|
if (rta == NULL || rtattr_parse_nested(tb, TCA_PEDIT_MAX, rta) < 0)
|
|
return -EINVAL;
|
|
|
|
if (tb[TCA_PEDIT_PARMS - 1] == NULL ||
|
|
RTA_PAYLOAD(tb[TCA_PEDIT_PARMS-1]) < sizeof(*parm))
|
|
return -EINVAL;
|
|
parm = RTA_DATA(tb[TCA_PEDIT_PARMS-1]);
|
|
ksize = parm->nkeys * sizeof(struct tc_pedit_key);
|
|
if (RTA_PAYLOAD(tb[TCA_PEDIT_PARMS-1]) < sizeof(*parm) + ksize)
|
|
return -EINVAL;
|
|
|
|
p = tcf_hash_check(parm->index, a, ovr, bind);
|
|
if (p == NULL) {
|
|
if (!parm->nkeys)
|
|
return -EINVAL;
|
|
p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
|
|
if (p == NULL)
|
|
return -ENOMEM;
|
|
keys = kmalloc(ksize, GFP_KERNEL);
|
|
if (keys == NULL) {
|
|
kfree(p);
|
|
return -ENOMEM;
|
|
}
|
|
ret = ACT_P_CREATED;
|
|
} else {
|
|
if (!ovr) {
|
|
tcf_hash_release(p, bind);
|
|
return -EEXIST;
|
|
}
|
|
if (p->nkeys && p->nkeys != parm->nkeys) {
|
|
keys = kmalloc(ksize, GFP_KERNEL);
|
|
if (keys == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
spin_lock_bh(&p->lock);
|
|
p->flags = parm->flags;
|
|
p->action = parm->action;
|
|
if (keys) {
|
|
kfree(p->keys);
|
|
p->keys = keys;
|
|
p->nkeys = parm->nkeys;
|
|
}
|
|
memcpy(p->keys, parm->keys, ksize);
|
|
spin_unlock_bh(&p->lock);
|
|
if (ret == ACT_P_CREATED)
|
|
tcf_hash_insert(p);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
tcf_pedit_cleanup(struct tc_action *a, int bind)
|
|
{
|
|
struct tcf_pedit *p = PRIV(a, pedit);
|
|
|
|
if (p != NULL) {
|
|
struct tc_pedit_key *keys = p->keys;
|
|
if (tcf_hash_release(p, bind)) {
|
|
kfree(keys);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tcf_pedit(struct sk_buff **pskb, struct tc_action *a, struct tcf_result *res)
|
|
{
|
|
struct tcf_pedit *p = PRIV(a, pedit);
|
|
struct sk_buff *skb = *pskb;
|
|
int i, munged = 0;
|
|
u8 *pptr;
|
|
|
|
if (!(skb->tc_verd & TC_OK2MUNGE)) {
|
|
/* should we set skb->cloned? */
|
|
if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
|
|
return p->action;
|
|
}
|
|
}
|
|
|
|
pptr = skb->nh.raw;
|
|
|
|
spin_lock(&p->lock);
|
|
|
|
p->tm.lastuse = jiffies;
|
|
|
|
if (p->nkeys > 0) {
|
|
struct tc_pedit_key *tkey = p->keys;
|
|
|
|
for (i = p->nkeys; i > 0; i--, tkey++) {
|
|
u32 *ptr;
|
|
int offset = tkey->off;
|
|
|
|
if (tkey->offmask) {
|
|
if (skb->len > tkey->at) {
|
|
char *j = pptr + tkey->at;
|
|
offset += ((*j & tkey->offmask) >>
|
|
tkey->shift);
|
|
} else {
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
if (offset % 4) {
|
|
printk("offset must be on 32 bit boundaries\n");
|
|
goto bad;
|
|
}
|
|
if (skb->len < 0 || (offset > 0 && offset > skb->len)) {
|
|
printk("offset %d cant exceed pkt length %d\n",
|
|
offset, skb->len);
|
|
goto bad;
|
|
}
|
|
|
|
ptr = (u32 *)(pptr+offset);
|
|
/* just do it, baby */
|
|
*ptr = ((*ptr & tkey->mask) ^ tkey->val);
|
|
munged++;
|
|
}
|
|
|
|
if (munged)
|
|
skb->tc_verd = SET_TC_MUNGED(skb->tc_verd);
|
|
goto done;
|
|
} else {
|
|
printk("pedit BUG: index %d\n",p->index);
|
|
}
|
|
|
|
bad:
|
|
p->qstats.overlimits++;
|
|
done:
|
|
p->bstats.bytes += skb->len;
|
|
p->bstats.packets++;
|
|
spin_unlock(&p->lock);
|
|
return p->action;
|
|
}
|
|
|
|
static int
|
|
tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,int bind, int ref)
|
|
{
|
|
unsigned char *b = skb->tail;
|
|
struct tc_pedit *opt;
|
|
struct tcf_pedit *p = PRIV(a, pedit);
|
|
struct tcf_t t;
|
|
int s;
|
|
|
|
s = sizeof(*opt) + p->nkeys * sizeof(struct tc_pedit_key);
|
|
|
|
/* netlink spinlocks held above us - must use ATOMIC */
|
|
opt = kmalloc(s, GFP_ATOMIC);
|
|
if (opt == NULL)
|
|
return -ENOBUFS;
|
|
memset(opt, 0, s);
|
|
|
|
memcpy(opt->keys, p->keys, p->nkeys * sizeof(struct tc_pedit_key));
|
|
opt->index = p->index;
|
|
opt->nkeys = p->nkeys;
|
|
opt->flags = p->flags;
|
|
opt->action = p->action;
|
|
opt->refcnt = p->refcnt - ref;
|
|
opt->bindcnt = p->bindcnt - bind;
|
|
|
|
|
|
#ifdef PEDIT_DEB
|
|
{
|
|
/* Debug - get rid of later */
|
|
int i;
|
|
struct tc_pedit_key *key = opt->keys;
|
|
|
|
for (i=0; i<opt->nkeys; i++, key++) {
|
|
printk( "\n key #%d",i);
|
|
printk( " at %d: val %08x mask %08x",
|
|
(unsigned int)key->off,
|
|
(unsigned int)key->val,
|
|
(unsigned int)key->mask);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
RTA_PUT(skb, TCA_PEDIT_PARMS, s, opt);
|
|
t.install = jiffies_to_clock_t(jiffies - p->tm.install);
|
|
t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
|
|
t.expires = jiffies_to_clock_t(p->tm.expires);
|
|
RTA_PUT(skb, TCA_PEDIT_TM, sizeof(t), &t);
|
|
return skb->len;
|
|
|
|
rtattr_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
static
|
|
struct tc_action_ops act_pedit_ops = {
|
|
.kind = "pedit",
|
|
.type = TCA_ACT_PEDIT,
|
|
.capab = TCA_CAP_NONE,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_pedit,
|
|
.dump = tcf_pedit_dump,
|
|
.cleanup = tcf_pedit_cleanup,
|
|
.lookup = tcf_hash_search,
|
|
.init = tcf_pedit_init,
|
|
.walk = tcf_generic_walker
|
|
};
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
|
|
MODULE_DESCRIPTION("Generic Packet Editor actions");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init
|
|
pedit_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_pedit_ops);
|
|
}
|
|
|
|
static void __exit
|
|
pedit_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_pedit_ops);
|
|
}
|
|
|
|
module_init(pedit_init_module);
|
|
module_exit(pedit_cleanup_module);
|
|
|