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447 lines
10 KiB
447 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* net/sched/act_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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* 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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static unsigned int ipt_net_id; |
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static struct tc_action_ops act_ipt_ops; |
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static unsigned int xt_net_id; |
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static struct tc_action_ops act_xt_ops; |
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static int ipt_init_target(struct net *net, struct xt_entry_target *t, |
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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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struct ipt_entry e = {}; |
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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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memset(&par, 0, sizeof(par)); |
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par.net = net; |
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par.table = table; |
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par.entryinfo = &e; |
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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, struct net *net) |
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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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.family = NFPROTO_IPV4, |
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.net = net, |
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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) |
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{ |
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struct tcf_ipt *ipt = to_ipt(a); |
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if (ipt->tcfi_t) { |
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ipt_destroy_target(ipt->tcfi_t, a->idrinfo->net); |
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kfree(ipt->tcfi_t); |
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} |
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kfree(ipt->tcfi_tname); |
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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, unsigned int id, struct nlattr *nla, |
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struct nlattr *est, struct tc_action **a, |
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const struct tc_action_ops *ops, |
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struct tcf_proto *tp, u32 flags) |
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{ |
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struct tc_action_net *tn = net_generic(net, id); |
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bool bind = flags & TCA_ACT_FLAGS_BIND; |
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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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bool exists = false; |
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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_deprecated(tb, TCA_IPT_MAX, nla, ipt_policy, |
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NULL); |
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if (err < 0) |
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return err; |
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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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err = tcf_idr_check_alloc(tn, &index, a, bind); |
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if (err < 0) |
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return err; |
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exists = err; |
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if (exists && bind) |
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return 0; |
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if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) { |
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if (exists) |
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tcf_idr_release(*a, bind); |
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else |
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tcf_idr_cleanup(tn, index); |
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return -EINVAL; |
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} |
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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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if (exists) |
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tcf_idr_release(*a, bind); |
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else |
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tcf_idr_cleanup(tn, index); |
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return -EINVAL; |
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} |
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if (!exists) { |
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ret = tcf_idr_create(tn, index, est, a, ops, bind, |
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false, 0); |
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if (ret) { |
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tcf_idr_cleanup(tn, index); |
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return ret; |
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} |
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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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if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
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tcf_idr_release(*a, bind); |
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return -EEXIST; |
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} |
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} |
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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_strscpy(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(net, t, tname, hook); |
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if (err < 0) |
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goto err3; |
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ipt = to_ipt(*a); |
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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, net); |
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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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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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tcf_idr_release(*a, bind); |
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return err; |
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} |
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static int tcf_ipt_init(struct net *net, struct nlattr *nla, |
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struct nlattr *est, struct tc_action **a, |
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struct tcf_proto *tp, |
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u32 flags, struct netlink_ext_ack *extack) |
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{ |
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return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, |
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tp, flags); |
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} |
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static int tcf_xt_init(struct net *net, struct nlattr *nla, |
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struct nlattr *est, struct tc_action **a, |
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struct tcf_proto *tp, |
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u32 flags, struct netlink_ext_ack *extack) |
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{ |
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return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, |
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tp, flags); |
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} |
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static int tcf_ipt_act(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 = to_ipt(a); |
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struct xt_action_param par; |
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struct nf_hook_state state = { |
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.net = dev_net(skb->dev), |
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.in = skb->dev, |
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.hook = ipt->tcfi_hook, |
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.pf = NFPROTO_IPV4, |
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}; |
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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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tcf_lastuse_update(&ipt->tcf_tm); |
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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.state = &state; |
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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_ACT_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, |
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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 = to_ipt(a); |
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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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spin_lock_bh(&ipt->tcf_lock); |
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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 = atomic_read(&ipt->tcf_bindcnt) - bind; |
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c.refcnt = refcount_read(&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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tcf_tm_dump(&tm, &ipt->tcf_tm); |
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if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD)) |
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goto nla_put_failure; |
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spin_unlock_bh(&ipt->tcf_lock); |
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kfree(t); |
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return skb->len; |
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nla_put_failure: |
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spin_unlock_bh(&ipt->tcf_lock); |
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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 int tcf_ipt_walker(struct net *net, struct sk_buff *skb, |
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struct netlink_callback *cb, int type, |
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const struct tc_action_ops *ops, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tc_action_net *tn = net_generic(net, ipt_net_id); |
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return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
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} |
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static int tcf_ipt_search(struct net *net, struct tc_action **a, u32 index) |
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{ |
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struct tc_action_net *tn = net_generic(net, ipt_net_id); |
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return tcf_idr_search(tn, a, index); |
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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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.id = TCA_ID_IPT, |
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.owner = THIS_MODULE, |
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.act = tcf_ipt_act, |
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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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.walk = tcf_ipt_walker, |
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.lookup = tcf_ipt_search, |
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.size = sizeof(struct tcf_ipt), |
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}; |
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static __net_init int ipt_init_net(struct net *net) |
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{ |
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struct tc_action_net *tn = net_generic(net, ipt_net_id); |
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return tc_action_net_init(net, tn, &act_ipt_ops); |
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} |
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static void __net_exit ipt_exit_net(struct list_head *net_list) |
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{ |
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tc_action_net_exit(net_list, ipt_net_id); |
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} |
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static struct pernet_operations ipt_net_ops = { |
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.init = ipt_init_net, |
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.exit_batch = ipt_exit_net, |
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.id = &ipt_net_id, |
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.size = sizeof(struct tc_action_net), |
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}; |
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static int tcf_xt_walker(struct net *net, struct sk_buff *skb, |
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struct netlink_callback *cb, int type, |
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const struct tc_action_ops *ops, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tc_action_net *tn = net_generic(net, xt_net_id); |
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return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
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} |
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static int tcf_xt_search(struct net *net, struct tc_action **a, u32 index) |
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{ |
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struct tc_action_net *tn = net_generic(net, xt_net_id); |
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return tcf_idr_search(tn, a, index); |
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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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.id = TCA_ID_XT, |
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.owner = THIS_MODULE, |
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.act = tcf_ipt_act, |
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.dump = tcf_ipt_dump, |
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.cleanup = tcf_ipt_release, |
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.init = tcf_xt_init, |
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.walk = tcf_xt_walker, |
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.lookup = tcf_xt_search, |
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.size = sizeof(struct tcf_ipt), |
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}; |
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static __net_init int xt_init_net(struct net *net) |
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{ |
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struct tc_action_net *tn = net_generic(net, xt_net_id); |
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return tc_action_net_init(net, tn, &act_xt_ops); |
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} |
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static void __net_exit xt_exit_net(struct list_head *net_list) |
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{ |
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tc_action_net_exit(net_list, xt_net_id); |
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} |
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static struct pernet_operations xt_net_ops = { |
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.init = xt_init_net, |
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.exit_batch = xt_exit_net, |
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.id = &xt_net_id, |
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.size = sizeof(struct tc_action_net), |
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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; |
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ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops); |
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if (ret1 < 0) |
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pr_err("Failed to load xt action\n"); |
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ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops); |
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if (ret2 < 0) |
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pr_err("Failed to load ipt action\n"); |
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if (ret1 < 0 && ret2 < 0) { |
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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_ipt_ops, &ipt_net_ops); |
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tcf_unregister_action(&act_xt_ops, &xt_net_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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