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1c524830d0
This allows to make decisions based on the revision (and address family with a follow-up patch) at runtime. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
331 lines
7.9 KiB
C
331 lines
7.9 KiB
C
/*
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* net/sched/ipt.c iptables target interface
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*
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*TODO: Add other tables. For now we only support the ipv4 table targets
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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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* Copyright: 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 <linux/kmod.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_ipt.h>
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#include <net/tc_act/tc_ipt.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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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_ipt *tcf_ipt_ht[MY_TAB_SIZE];
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/* ipt hash table lock */
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static DEFINE_RWLOCK(ipt_lock);
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/* ovewrride the defaults */
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#define tcf_st tcf_ipt
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#define tcf_t_lock ipt_lock
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#define tcf_ht tcf_ipt_ht
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#define CONFIG_NET_ACT_INIT
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#include <net/pkt_act.h>
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static int
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ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook)
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{
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struct ipt_target *target;
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int ret = 0;
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target = xt_find_target(AF_INET, t->u.user.name, t->u.user.revision);
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if (!target)
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return -ENOENT;
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DPRINTK("ipt_init_target: found %s\n", target->name);
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t->u.kernel.target = target;
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if (t->u.kernel.target->checkentry
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&& !t->u.kernel.target->checkentry(table, NULL,
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t->u.kernel.target, t->data,
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t->u.target_size - sizeof(*t),
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hook)) {
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DPRINTK("ipt_init_target: check failed for `%s'.\n",
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t->u.kernel.target->name);
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module_put(t->u.kernel.target->me);
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ret = -EINVAL;
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}
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return ret;
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}
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static void
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ipt_destroy_target(struct ipt_entry_target *t)
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{
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if (t->u.kernel.target->destroy)
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t->u.kernel.target->destroy(t->u.kernel.target, t->data,
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t->u.target_size - sizeof(*t));
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module_put(t->u.kernel.target->me);
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}
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static int
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tcf_ipt_release(struct tcf_ipt *p, int bind)
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{
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int ret = 0;
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if (p) {
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if (bind)
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p->bindcnt--;
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p->refcnt--;
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if (p->bindcnt <= 0 && p->refcnt <= 0) {
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ipt_destroy_target(p->t);
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kfree(p->tname);
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kfree(p->t);
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tcf_hash_destroy(p);
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ret = ACT_P_DELETED;
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}
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}
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return ret;
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}
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static int
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tcf_ipt_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_IPT_MAX];
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struct tcf_ipt *p;
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struct ipt_entry_target *td, *t;
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char *tname;
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int ret = 0, err;
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u32 hook = 0;
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u32 index = 0;
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if (rta == NULL || rtattr_parse_nested(tb, TCA_IPT_MAX, rta) < 0)
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return -EINVAL;
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if (tb[TCA_IPT_HOOK-1] == NULL ||
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RTA_PAYLOAD(tb[TCA_IPT_HOOK-1]) < sizeof(u32))
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return -EINVAL;
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if (tb[TCA_IPT_TARG-1] == NULL ||
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RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < sizeof(*t))
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return -EINVAL;
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td = (struct ipt_entry_target *)RTA_DATA(tb[TCA_IPT_TARG-1]);
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if (RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < td->u.target_size)
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return -EINVAL;
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if (tb[TCA_IPT_INDEX-1] != NULL &&
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RTA_PAYLOAD(tb[TCA_IPT_INDEX-1]) >= sizeof(u32))
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index = *(u32 *)RTA_DATA(tb[TCA_IPT_INDEX-1]);
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p = tcf_hash_check(index, a, ovr, bind);
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if (p == NULL) {
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p = tcf_hash_create(index, est, a, sizeof(*p), ovr, bind);
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if (p == NULL)
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return -ENOMEM;
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ret = ACT_P_CREATED;
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} else {
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if (!ovr) {
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tcf_ipt_release(p, bind);
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return -EEXIST;
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}
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}
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hook = *(u32 *)RTA_DATA(tb[TCA_IPT_HOOK-1]);
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err = -ENOMEM;
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tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
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if (tname == NULL)
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goto err1;
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if (tb[TCA_IPT_TABLE - 1] == NULL ||
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rtattr_strlcpy(tname, tb[TCA_IPT_TABLE-1], IFNAMSIZ) >= IFNAMSIZ)
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strcpy(tname, "mangle");
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t = kmalloc(td->u.target_size, GFP_KERNEL);
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if (t == NULL)
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goto err2;
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memcpy(t, td, td->u.target_size);
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if ((err = ipt_init_target(t, tname, hook)) < 0)
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goto err3;
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spin_lock_bh(&p->lock);
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if (ret != ACT_P_CREATED) {
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ipt_destroy_target(p->t);
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kfree(p->tname);
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kfree(p->t);
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}
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p->tname = tname;
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p->t = t;
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p->hook = hook;
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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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err3:
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kfree(t);
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err2:
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kfree(tname);
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err1:
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kfree(p);
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return err;
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}
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static int
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tcf_ipt_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_ipt *p = PRIV(a, ipt);
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return tcf_ipt_release(p, bind);
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}
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static int
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tcf_ipt(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
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{
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int ret = 0, result = 0;
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struct tcf_ipt *p = PRIV(a, ipt);
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if (skb_cloned(skb)) {
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if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
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return TC_ACT_UNSPEC;
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}
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spin_lock(&p->lock);
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p->tm.lastuse = jiffies;
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p->bstats.bytes += skb->len;
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p->bstats.packets++;
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/* yes, we have to worry about both in and out dev
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worry later - danger - this API seems to have changed
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from earlier kernels */
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/* iptables targets take a double skb pointer in case the skb
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* needs to be replaced. We don't own the skb, so this must not
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* happen. The pskb_expand_head above should make sure of this */
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ret = p->t->u.kernel.target->target(&skb, skb->dev, NULL, p->hook,
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p->t->u.kernel.target, p->t->data,
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NULL);
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switch (ret) {
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case NF_ACCEPT:
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result = TC_ACT_OK;
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break;
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case NF_DROP:
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result = TC_ACT_SHOT;
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p->qstats.drops++;
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break;
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case IPT_CONTINUE:
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result = TC_ACT_PIPE;
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break;
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default:
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if (net_ratelimit())
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printk("Bogus netfilter code %d assume ACCEPT\n", ret);
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result = TC_POLICE_OK;
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break;
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}
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spin_unlock(&p->lock);
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return result;
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}
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static int
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tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
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{
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struct ipt_entry_target *t;
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struct tcf_t tm;
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struct tc_cnt c;
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unsigned char *b = skb->tail;
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struct tcf_ipt *p = PRIV(a, ipt);
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/* for simple targets kernel size == user size
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** user name = target name
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** for foolproof you need to not assume this
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*/
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t = kmalloc(p->t->u.user.target_size, GFP_ATOMIC);
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if (t == NULL)
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goto rtattr_failure;
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c.bindcnt = p->bindcnt - bind;
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c.refcnt = p->refcnt - ref;
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memcpy(t, p->t, p->t->u.user.target_size);
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strcpy(t->u.user.name, p->t->u.kernel.target->name);
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DPRINTK("\ttcf_ipt_dump tablename %s length %d\n", p->tname,
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strlen(p->tname));
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DPRINTK("\tdump target name %s size %d size user %d "
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"data[0] %x data[1] %x\n", p->t->u.kernel.target->name,
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p->t->u.target_size, p->t->u.user.target_size,
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p->t->data[0], p->t->data[1]);
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RTA_PUT(skb, TCA_IPT_TARG, p->t->u.user.target_size, t);
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RTA_PUT(skb, TCA_IPT_INDEX, 4, &p->index);
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RTA_PUT(skb, TCA_IPT_HOOK, 4, &p->hook);
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RTA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
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RTA_PUT(skb, TCA_IPT_TABLE, IFNAMSIZ, p->tname);
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tm.install = jiffies_to_clock_t(jiffies - p->tm.install);
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tm.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
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tm.expires = jiffies_to_clock_t(p->tm.expires);
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RTA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
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kfree(t);
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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(t);
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return -1;
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}
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static struct tc_action_ops act_ipt_ops = {
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.kind = "ipt",
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.type = TCA_ACT_IPT,
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.capab = TCA_CAP_NONE,
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.owner = THIS_MODULE,
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.act = tcf_ipt,
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.dump = tcf_ipt_dump,
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.cleanup = tcf_ipt_cleanup,
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.lookup = tcf_hash_search,
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.init = tcf_ipt_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("Iptables target actions");
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MODULE_LICENSE("GPL");
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static int __init
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ipt_init_module(void)
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{
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return tcf_register_action(&act_ipt_ops);
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}
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static void __exit
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ipt_cleanup_module(void)
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{
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tcf_unregister_action(&act_ipt_ops);
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}
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module_init(ipt_init_module);
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module_exit(ipt_cleanup_module);
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