Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2010 Patrick McHardy <kaber@trash.net> */#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt#include <linux/module.h>#include <linux/gfp.h>#include <linux/skbuff.h>#include <linux/netfilter_ipv4/ip_tables.h>#include <linux/netfilter_ipv6/ip6_tables.h>#include <linux/netfilter/x_tables.h>#include <linux/netfilter/xt_CT.h>#include <net/netfilter/nf_conntrack.h>#include <net/netfilter/nf_conntrack_l4proto.h>#include <net/netfilter/nf_conntrack_helper.h>#include <net/netfilter/nf_conntrack_ecache.h>#include <net/netfilter/nf_conntrack_timeout.h>#include <net/netfilter/nf_conntrack_zones.h>#include "nf_internals.h"
static inline int xt_ct_target(struct sk_buff *skb, struct nf_conn *ct){ /* Previously seen (loopback)? Ignore. */ if (skb->_nfct != 0) return XT_CONTINUE;
if (ct) { refcount_inc(&ct->ct_general.use); nf_ct_set(skb, ct, IP_CT_NEW); } else { nf_ct_set(skb, ct, IP_CT_UNTRACKED); }
return XT_CONTINUE;}
static unsigned int xt_ct_target_v0(struct sk_buff *skb, const struct xt_action_param *par){ const struct xt_ct_target_info *info = par->targinfo; struct nf_conn *ct = info->ct;
return xt_ct_target(skb, ct);}
static unsigned int xt_ct_target_v1(struct sk_buff *skb, const struct xt_action_param *par){ const struct xt_ct_target_info_v1 *info = par->targinfo; struct nf_conn *ct = info->ct;
return xt_ct_target(skb, ct);}
static u8 xt_ct_find_proto(const struct xt_tgchk_param *par){ if (par->family == NFPROTO_IPV4) { const struct ipt_entry *e = par->entryinfo;
if (e->ip.invflags & IPT_INV_PROTO) return 0; return e->ip.proto; } else if (par->family == NFPROTO_IPV6) { const struct ip6t_entry *e = par->entryinfo;
if (e->ipv6.invflags & IP6T_INV_PROTO) return 0; return e->ipv6.proto; } else return 0;}
static intxt_ct_set_helper(struct nf_conn *ct, const char *helper_name, const struct xt_tgchk_param *par){ struct nf_conntrack_helper *helper; struct nf_conn_help *help; u8 proto;
proto = xt_ct_find_proto(par); if (!proto) { pr_info_ratelimited("You must specify a L4 protocol and not use inversions on it\n"); return -ENOENT; }
helper = nf_conntrack_helper_try_module_get(helper_name, par->family, proto); if (helper == NULL) { pr_info_ratelimited("No such helper \"%s\"\n", helper_name); return -ENOENT; }
help = nf_ct_helper_ext_add(ct, GFP_KERNEL_ACCOUNT); if (help == NULL) { nf_conntrack_helper_put(helper); return -ENOMEM; }
rcu_assign_pointer(help->helper, helper); return 0;}
static intxt_ct_set_timeout(struct nf_conn *ct, const struct xt_tgchk_param *par, const char *timeout_name){#ifdef CONFIG_NF_CONNTRACK_TIMEOUT const struct nf_conntrack_l4proto *l4proto; u8 proto;
proto = xt_ct_find_proto(par); if (!proto) { pr_info_ratelimited("You must specify a L4 protocol and not " "use inversions on it"); return -EINVAL; } l4proto = nf_ct_l4proto_find(proto); return nf_ct_set_timeout(par->net, ct, par->family, l4proto->l4proto, timeout_name);
#else return -EOPNOTSUPP;#endif}
static u16 xt_ct_flags_to_dir(const struct xt_ct_target_info_v1 *info){ switch (info->flags & (XT_CT_ZONE_DIR_ORIG | XT_CT_ZONE_DIR_REPL)) { case XT_CT_ZONE_DIR_ORIG: return NF_CT_ZONE_DIR_ORIG; case XT_CT_ZONE_DIR_REPL: return NF_CT_ZONE_DIR_REPL; default: return NF_CT_DEFAULT_ZONE_DIR; }}
static void xt_ct_put_helper(struct nf_conn_help *help){ struct nf_conntrack_helper *helper;
if (!help) return;
/* not yet exposed to other cpus, or ruleset * already detached (post-replacement). */ helper = rcu_dereference_raw(help->helper); if (helper) nf_conntrack_helper_put(helper);}
static int xt_ct_tg_check(const struct xt_tgchk_param *par, struct xt_ct_target_info_v1 *info){ struct nf_conntrack_zone zone; struct nf_conn_help *help; struct nf_conn *ct; int ret = -EOPNOTSUPP;
if (info->flags & XT_CT_NOTRACK) { ct = NULL; goto out; }
#ifndef CONFIG_NF_CONNTRACK_ZONES if (info->zone || info->flags & (XT_CT_ZONE_DIR_ORIG | XT_CT_ZONE_DIR_REPL | XT_CT_ZONE_MARK)) goto err1;#endif
ret = nf_ct_netns_get(par->net, par->family); if (ret < 0) goto err1;
memset(&zone, 0, sizeof(zone)); zone.id = info->zone; zone.dir = xt_ct_flags_to_dir(info); if (info->flags & XT_CT_ZONE_MARK) zone.flags |= NF_CT_FLAG_MARK;
ct = nf_ct_tmpl_alloc(par->net, &zone, GFP_KERNEL_ACCOUNT); if (!ct) { ret = -ENOMEM; goto err2; }
if ((info->ct_events || info->exp_events) && !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events, GFP_KERNEL_ACCOUNT)) { ret = -EINVAL; goto err3; }
if (info->helper[0]) { if (strnlen(info->helper, sizeof(info->helper)) == sizeof(info->helper)) { ret = -ENAMETOOLONG; goto err3; }
ret = xt_ct_set_helper(ct, info->helper, par); if (ret < 0) goto err3; }
if (info->timeout[0]) { if (strnlen(info->timeout, sizeof(info->timeout)) == sizeof(info->timeout)) { ret = -ENAMETOOLONG; goto err4; }
ret = xt_ct_set_timeout(ct, par, info->timeout); if (ret < 0) goto err4; } __set_bit(IPS_CONFIRMED_BIT, &ct->status);out: info->ct = ct; return 0;
err4: help = nfct_help(ct); xt_ct_put_helper(help);err3: nf_ct_tmpl_free(ct);err2: nf_ct_netns_put(par->net, par->family);err1: return ret;}
static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par){ struct xt_ct_target_info *info = par->targinfo; struct xt_ct_target_info_v1 info_v1 = { .flags = info->flags, .zone = info->zone, .ct_events = info->ct_events, .exp_events = info->exp_events, }; int ret;
if (info->flags & ~XT_CT_NOTRACK) return -EINVAL;
memcpy(info_v1.helper, info->helper, sizeof(info->helper));
ret = xt_ct_tg_check(par, &info_v1); if (ret < 0) return ret;
info->ct = info_v1.ct;
return ret;}
static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par){ struct xt_ct_target_info_v1 *info = par->targinfo;
if (info->flags & ~XT_CT_NOTRACK) return -EINVAL;
return xt_ct_tg_check(par, par->targinfo);}
static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par){ struct xt_ct_target_info_v1 *info = par->targinfo;
if (info->flags & ~XT_CT_MASK) return -EINVAL;
return xt_ct_tg_check(par, par->targinfo);}
static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par, struct xt_ct_target_info_v1 *info){ struct nf_conn *ct = info->ct; struct nf_conn_help *help;
if (ct) { help = nfct_help(ct); xt_ct_put_helper(help);
nf_ct_netns_put(par->net, par->family);
nf_ct_destroy_timeout(ct); nf_ct_put(info->ct); }}
static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par){ struct xt_ct_target_info *info = par->targinfo; struct xt_ct_target_info_v1 info_v1 = { .flags = info->flags, .zone = info->zone, .ct_events = info->ct_events, .exp_events = info->exp_events, .ct = info->ct, }; memcpy(info_v1.helper, info->helper, sizeof(info->helper));
xt_ct_tg_destroy(par, &info_v1);}
static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par){ xt_ct_tg_destroy(par, par->targinfo);}
static unsigned intnotrack_tg(struct sk_buff *skb, const struct xt_action_param *par){ /* Previously seen (loopback)? Ignore. */ if (skb->_nfct != 0) return XT_CONTINUE;
nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
return XT_CONTINUE;}
static struct xt_target xt_ct_tg_reg[] __read_mostly = { { .name = "NOTRACK", .revision = 0, .family = NFPROTO_IPV4, .target = notrack_tg, .table = "raw", .me = THIS_MODULE, }, { .name = "CT", .family = NFPROTO_IPV4, .targetsize = sizeof(struct xt_ct_target_info), .usersize = offsetof(struct xt_ct_target_info, ct), .checkentry = xt_ct_tg_check_v0, .destroy = xt_ct_tg_destroy_v0, .target = xt_ct_target_v0, .table = "raw", .me = THIS_MODULE, }, { .name = "CT", .family = NFPROTO_IPV4, .revision = 1, .targetsize = sizeof(struct xt_ct_target_info_v1), .usersize = offsetof(struct xt_ct_target_info_v1, ct), .checkentry = xt_ct_tg_check_v1, .destroy = xt_ct_tg_destroy_v1, .target = xt_ct_target_v1, .table = "raw", .me = THIS_MODULE, }, { .name = "CT", .family = NFPROTO_IPV4, .revision = 2, .targetsize = sizeof(struct xt_ct_target_info_v1), .usersize = offsetof(struct xt_ct_target_info_v1, ct), .checkentry = xt_ct_tg_check_v2, .destroy = xt_ct_tg_destroy_v1, .target = xt_ct_target_v1, .table = "raw", .me = THIS_MODULE, },#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) { .name = "NOTRACK", .revision = 0, .family = NFPROTO_IPV6, .target = notrack_tg, .table = "raw", .me = THIS_MODULE, }, { .name = "CT", .family = NFPROTO_IPV6, .targetsize = sizeof(struct xt_ct_target_info), .usersize = offsetof(struct xt_ct_target_info, ct), .checkentry = xt_ct_tg_check_v0, .destroy = xt_ct_tg_destroy_v0, .target = xt_ct_target_v0, .table = "raw", .me = THIS_MODULE, }, { .name = "CT", .family = NFPROTO_IPV6, .revision = 1, .targetsize = sizeof(struct xt_ct_target_info_v1), .usersize = offsetof(struct xt_ct_target_info_v1, ct), .checkentry = xt_ct_tg_check_v1, .destroy = xt_ct_tg_destroy_v1, .target = xt_ct_target_v1, .table = "raw", .me = THIS_MODULE, }, { .name = "CT", .family = NFPROTO_IPV6, .revision = 2, .targetsize = sizeof(struct xt_ct_target_info_v1), .usersize = offsetof(struct xt_ct_target_info_v1, ct), .checkentry = xt_ct_tg_check_v2, .destroy = xt_ct_tg_destroy_v1, .target = xt_ct_target_v1, .table = "raw", .me = THIS_MODULE, },#endif};
static int __init xt_ct_tg_init(void){ return xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));}
static void __exit xt_ct_tg_exit(void){ xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));}
module_init(xt_ct_tg_init);module_exit(xt_ct_tg_exit);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Xtables: connection tracking target");MODULE_ALIAS("ipt_CT");MODULE_ALIAS("ip6t_CT");MODULE_ALIAS("ipt_NOTRACK");MODULE_ALIAS("ip6t_NOTRACK");