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