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![WANG Cong](/assets/img/avatar_default.png)
For bindcnt and refcnt etc., they are common for all actions, not need to repeat such operations for their own, they can be unified now. Actions just need to do its specific cleanup if needed. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
319 lines
7.5 KiB
C
319 lines
7.5 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 (2002-13)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.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/slab.h>
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#include <net/netlink.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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#define IPT_TAB_MASK 15
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static struct tcf_hashinfo ipt_hash_info;
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static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
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{
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struct xt_tgchk_param par;
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struct xt_target *target;
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int ret = 0;
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target = xt_request_find_target(AF_INET, t->u.user.name,
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t->u.user.revision);
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if (IS_ERR(target))
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return PTR_ERR(target);
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t->u.kernel.target = target;
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par.table = table;
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par.entryinfo = NULL;
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par.target = target;
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par.targinfo = t->data;
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par.hook_mask = hook;
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par.family = NFPROTO_IPV4;
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ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
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if (ret < 0) {
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module_put(t->u.kernel.target->me);
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return ret;
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}
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return 0;
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}
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static void ipt_destroy_target(struct xt_entry_target *t)
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{
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struct xt_tgdtor_param par = {
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.target = t->u.kernel.target,
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.targinfo = t->data,
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};
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if (par.target->destroy != NULL)
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par.target->destroy(&par);
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module_put(par.target->me);
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}
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static void tcf_ipt_release(struct tc_action *a, int bind)
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{
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struct tcf_ipt *ipt = to_ipt(a);
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ipt_destroy_target(ipt->tcfi_t);
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kfree(ipt->tcfi_tname);
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kfree(ipt->tcfi_t);
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}
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static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
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[TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
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[TCA_IPT_HOOK] = { .type = NLA_U32 },
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[TCA_IPT_INDEX] = { .type = NLA_U32 },
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[TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
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};
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static int tcf_ipt_init(struct net *net, struct nlattr *nla, struct nlattr *est,
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struct tc_action *a, int ovr, int bind)
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{
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struct nlattr *tb[TCA_IPT_MAX + 1];
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struct tcf_ipt *ipt;
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struct xt_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 (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
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if (err < 0)
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return err;
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if (tb[TCA_IPT_HOOK] == NULL)
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return -EINVAL;
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if (tb[TCA_IPT_TARG] == NULL)
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return -EINVAL;
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td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
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if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
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return -EINVAL;
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if (tb[TCA_IPT_INDEX] != NULL)
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index = nla_get_u32(tb[TCA_IPT_INDEX]);
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if (!tcf_hash_check(index, a, bind) ) {
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ret = tcf_hash_create(index, est, a, sizeof(*ipt), bind);
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if (ret)
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return ret;
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ret = ACT_P_CREATED;
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} else {
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if (bind)/* dont override defaults */
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return 0;
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tcf_hash_release(a, bind);
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if (!ovr)
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return -EEXIST;
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}
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ipt = to_ipt(a);
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hook = nla_get_u32(tb[TCA_IPT_HOOK]);
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err = -ENOMEM;
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tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
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if (unlikely(!tname))
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goto err1;
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if (tb[TCA_IPT_TABLE] == NULL ||
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nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
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strcpy(tname, "mangle");
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t = kmemdup(td, td->u.target_size, GFP_KERNEL);
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if (unlikely(!t))
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goto err2;
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err = ipt_init_target(t, tname, hook);
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if (err < 0)
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goto err3;
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spin_lock_bh(&ipt->tcf_lock);
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if (ret != ACT_P_CREATED) {
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ipt_destroy_target(ipt->tcfi_t);
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kfree(ipt->tcfi_tname);
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kfree(ipt->tcfi_t);
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}
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ipt->tcfi_tname = tname;
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ipt->tcfi_t = t;
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ipt->tcfi_hook = hook;
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spin_unlock_bh(&ipt->tcf_lock);
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if (ret == ACT_P_CREATED)
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tcf_hash_insert(a);
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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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if (ret == ACT_P_CREATED)
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tcf_hash_cleanup(a, est);
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return err;
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}
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static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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int ret = 0, result = 0;
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struct tcf_ipt *ipt = a->priv;
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struct xt_action_param par;
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if (skb_unclone(skb, GFP_ATOMIC))
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return TC_ACT_UNSPEC;
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spin_lock(&ipt->tcf_lock);
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ipt->tcf_tm.lastuse = jiffies;
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bstats_update(&ipt->tcf_bstats, skb);
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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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*/
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par.in = skb->dev;
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par.out = NULL;
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par.hooknum = ipt->tcfi_hook;
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par.target = ipt->tcfi_t->u.kernel.target;
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par.targinfo = ipt->tcfi_t->data;
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ret = par.target->target(skb, &par);
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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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ipt->tcf_qstats.drops++;
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break;
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case XT_CONTINUE:
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result = TC_ACT_PIPE;
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break;
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default:
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net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
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ret);
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result = TC_POLICE_OK;
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break;
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}
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spin_unlock(&ipt->tcf_lock);
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return result;
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}
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static int tcf_ipt_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_pointer(skb);
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struct tcf_ipt *ipt = a->priv;
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struct xt_entry_target *t;
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struct tcf_t tm;
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struct tc_cnt c;
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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 = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
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if (unlikely(!t))
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goto nla_put_failure;
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c.bindcnt = ipt->tcf_bindcnt - bind;
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c.refcnt = ipt->tcf_refcnt - ref;
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strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
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if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
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nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
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nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
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nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
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nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
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goto nla_put_failure;
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tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
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tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
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tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
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if (nla_put(skb, TCA_IPT_TM, sizeof (tm), &tm))
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goto nla_put_failure;
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kfree(t);
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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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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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.hinfo = &ipt_hash_info,
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.type = TCA_ACT_IPT,
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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_release,
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.init = tcf_ipt_init,
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};
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static struct tc_action_ops act_xt_ops = {
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.kind = "xt",
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.hinfo = &ipt_hash_info,
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.type = TCA_ACT_XT,
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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_release,
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.init = tcf_ipt_init,
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};
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MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
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MODULE_DESCRIPTION("Iptables target actions");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("act_xt");
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static int __init ipt_init_module(void)
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{
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int ret1, ret2, err;
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err = tcf_hashinfo_init(&ipt_hash_info, IPT_TAB_MASK);
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if (err)
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return err;
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ret1 = tcf_register_action(&act_xt_ops);
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if (ret1 < 0)
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printk("Failed to load xt action\n");
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ret2 = tcf_register_action(&act_ipt_ops);
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if (ret2 < 0)
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printk("Failed to load ipt action\n");
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if (ret1 < 0 && ret2 < 0) {
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tcf_hashinfo_destroy(&ipt_hash_info);
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return ret1;
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} else
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return 0;
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}
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static void __exit ipt_cleanup_module(void)
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{
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tcf_unregister_action(&act_xt_ops);
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tcf_unregister_action(&act_ipt_ops);
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tcf_hashinfo_destroy(&ipt_hash_info);
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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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