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Diffstat (limited to 'net/netfilter/xt_conntrack.c')
-rw-r--r--net/netfilter/xt_conntrack.c157
1 files changed, 102 insertions, 55 deletions
diff --git a/net/netfilter/xt_conntrack.c b/net/netfilter/xt_conntrack.c
index 6dc4652f2fe..188404b9b00 100644
--- a/net/netfilter/xt_conntrack.c
+++ b/net/netfilter/xt_conntrack.c
@@ -3,13 +3,14 @@
* information. (Superset of Rusty's minimalistic state match.)
*
* (C) 2001 Marc Boucher (marc@mbsi.ca).
+ * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
* Copyright © CC Computer Consultants GmbH, 2007 - 2008
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
-
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <net/ipv6.h>
@@ -112,8 +113,57 @@ ct_proto_port_check(const struct xt_conntrack_mtinfo2 *info,
return true;
}
+static inline bool
+port_match(u16 min, u16 max, u16 port, bool invert)
+{
+ return (port >= min && port <= max) ^ invert;
+}
+
+static inline bool
+ct_proto_port_check_v3(const struct xt_conntrack_mtinfo3 *info,
+ const struct nf_conn *ct)
+{
+ const struct nf_conntrack_tuple *tuple;
+
+ tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+ if ((info->match_flags & XT_CONNTRACK_PROTO) &&
+ (nf_ct_protonum(ct) == info->l4proto) ^
+ !(info->invert_flags & XT_CONNTRACK_PROTO))
+ return false;
+
+ /* Shortcut to match all recognized protocols by using ->src.all. */
+ if ((info->match_flags & XT_CONNTRACK_ORIGSRC_PORT) &&
+ !port_match(info->origsrc_port, info->origsrc_port_high,
+ ntohs(tuple->src.u.all),
+ info->invert_flags & XT_CONNTRACK_ORIGSRC_PORT))
+ return false;
+
+ if ((info->match_flags & XT_CONNTRACK_ORIGDST_PORT) &&
+ !port_match(info->origdst_port, info->origdst_port_high,
+ ntohs(tuple->dst.u.all),
+ info->invert_flags & XT_CONNTRACK_ORIGDST_PORT))
+ return false;
+
+ tuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+
+ if ((info->match_flags & XT_CONNTRACK_REPLSRC_PORT) &&
+ !port_match(info->replsrc_port, info->replsrc_port_high,
+ ntohs(tuple->src.u.all),
+ info->invert_flags & XT_CONNTRACK_REPLSRC_PORT))
+ return false;
+
+ if ((info->match_flags & XT_CONNTRACK_REPLDST_PORT) &&
+ !port_match(info->repldst_port, info->repldst_port_high,
+ ntohs(tuple->dst.u.all),
+ info->invert_flags & XT_CONNTRACK_REPLDST_PORT))
+ return false;
+
+ return true;
+}
+
static bool
-conntrack_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+conntrack_mt(const struct sk_buff *skb, struct xt_action_param *par,
+ u16 state_mask, u16 status_mask)
{
const struct xt_conntrack_mtinfo2 *info = par->matchinfo;
enum ip_conntrack_info ctinfo;
@@ -122,11 +172,12 @@ conntrack_mt(const struct sk_buff *skb, const struct xt_match_param *par)
ct = nf_ct_get(skb, &ctinfo);
- if (ct == &nf_conntrack_untracked)
- statebit = XT_CONNTRACK_STATE_UNTRACKED;
- else if (ct != NULL)
- statebit = XT_CONNTRACK_STATE_BIT(ctinfo);
- else
+ if (ct) {
+ if (nf_ct_is_untracked(ct))
+ statebit = XT_CONNTRACK_STATE_UNTRACKED;
+ else
+ statebit = XT_CONNTRACK_STATE_BIT(ctinfo);
+ } else
statebit = XT_CONNTRACK_STATE_INVALID;
if (info->match_flags & XT_CONNTRACK_STATE) {
@@ -136,7 +187,7 @@ conntrack_mt(const struct sk_buff *skb, const struct xt_match_param *par)
if (test_bit(IPS_DST_NAT_BIT, &ct->status))
statebit |= XT_CONNTRACK_STATE_DNAT;
}
- if (!!(info->state_mask & statebit) ^
+ if (!!(state_mask & statebit) ^
!(info->invert_flags & XT_CONNTRACK_STATE))
return false;
}
@@ -145,7 +196,7 @@ conntrack_mt(const struct sk_buff *skb, const struct xt_match_param *par)
return info->match_flags & XT_CONNTRACK_STATE;
if ((info->match_flags & XT_CONNTRACK_DIRECTION) &&
(CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) ^
- !!(info->invert_flags & XT_CONNTRACK_DIRECTION))
+ !(info->invert_flags & XT_CONNTRACK_DIRECTION))
return false;
if (info->match_flags & XT_CONNTRACK_ORIGSRC)
@@ -168,11 +219,16 @@ conntrack_mt(const struct sk_buff *skb, const struct xt_match_param *par)
!(info->invert_flags & XT_CONNTRACK_REPLDST))
return false;
- if (!ct_proto_port_check(info, ct))
- return false;
+ if (par->match->revision != 3) {
+ if (!ct_proto_port_check(info, ct))
+ return false;
+ } else {
+ if (!ct_proto_port_check_v3(par->matchinfo, ct))
+ return false;
+ }
if ((info->match_flags & XT_CONNTRACK_STATUS) &&
- (!!(info->status_mask & ct->status) ^
+ (!!(status_mask & ct->status) ^
!(info->invert_flags & XT_CONNTRACK_STATUS)))
return false;
@@ -190,50 +246,38 @@ conntrack_mt(const struct sk_buff *skb, const struct xt_match_param *par)
}
static bool
-conntrack_mt_v1(const struct sk_buff *skb, const struct xt_match_param *par)
+conntrack_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
{
- const struct xt_conntrack_mtinfo2 *const *info = par->matchinfo;
- struct xt_match_param newpar = *par;
+ const struct xt_conntrack_mtinfo1 *info = par->matchinfo;
- newpar.matchinfo = *info;
- return conntrack_mt(skb, &newpar);
+ return conntrack_mt(skb, par, info->state_mask, info->status_mask);
}
-static bool conntrack_mt_check(const struct xt_mtchk_param *par)
+static bool
+conntrack_mt_v2(const struct sk_buff *skb, struct xt_action_param *par)
{
- if (nf_ct_l3proto_try_module_get(par->family) < 0) {
- printk(KERN_WARNING "can't load conntrack support for "
- "proto=%u\n", par->family);
- return false;
- }
- return true;
+ const struct xt_conntrack_mtinfo2 *info = par->matchinfo;
+
+ return conntrack_mt(skb, par, info->state_mask, info->status_mask);
}
-static bool conntrack_mt_check_v1(const struct xt_mtchk_param *par)
+static bool
+conntrack_mt_v3(const struct sk_buff *skb, struct xt_action_param *par)
{
- struct xt_conntrack_mtinfo1 *info = par->matchinfo;
- struct xt_conntrack_mtinfo2 *up;
- int ret = conntrack_mt_check(par);
+ const struct xt_conntrack_mtinfo3 *info = par->matchinfo;
- if (ret < 0)
- return ret;
+ return conntrack_mt(skb, par, info->state_mask, info->status_mask);
+}
- up = kmalloc(sizeof(*up), GFP_KERNEL);
- if (up == NULL) {
- nf_ct_l3proto_module_put(par->family);
- return -ENOMEM;
- }
+static int conntrack_mt_check(const struct xt_mtchk_param *par)
+{
+ int ret;
- /*
- * The strategy here is to minimize the overhead of v1 matching,
- * by prebuilding a v2 struct and putting the pointer into the
- * v1 dataspace.
- */
- memcpy(up, info, offsetof(typeof(*info), state_mask));
- up->state_mask = info->state_mask;
- up->status_mask = info->status_mask;
- *(void **)info = up;
- return true;
+ ret = nf_ct_l3proto_try_module_get(par->family);
+ if (ret < 0)
+ pr_info("cannot load conntrack support for proto=%u\n",
+ par->family);
+ return ret;
}
static void conntrack_mt_destroy(const struct xt_mtdtor_param *par)
@@ -241,13 +285,6 @@ static void conntrack_mt_destroy(const struct xt_mtdtor_param *par)
nf_ct_l3proto_module_put(par->family);
}
-static void conntrack_mt_destroy_v1(const struct xt_mtdtor_param *par)
-{
- struct xt_conntrack_mtinfo2 **info = par->matchinfo;
- kfree(*info);
- conntrack_mt_destroy(par);
-}
-
static struct xt_match conntrack_mt_reg[] __read_mostly = {
{
.name = "conntrack",
@@ -255,8 +292,8 @@ static struct xt_match conntrack_mt_reg[] __read_mostly = {
.family = NFPROTO_UNSPEC,
.matchsize = sizeof(struct xt_conntrack_mtinfo1),
.match = conntrack_mt_v1,
- .checkentry = conntrack_mt_check_v1,
- .destroy = conntrack_mt_destroy_v1,
+ .checkentry = conntrack_mt_check,
+ .destroy = conntrack_mt_destroy,
.me = THIS_MODULE,
},
{
@@ -264,7 +301,17 @@ static struct xt_match conntrack_mt_reg[] __read_mostly = {
.revision = 2,
.family = NFPROTO_UNSPEC,
.matchsize = sizeof(struct xt_conntrack_mtinfo2),
- .match = conntrack_mt,
+ .match = conntrack_mt_v2,
+ .checkentry = conntrack_mt_check,
+ .destroy = conntrack_mt_destroy,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "conntrack",
+ .revision = 3,
+ .family = NFPROTO_UNSPEC,
+ .matchsize = sizeof(struct xt_conntrack_mtinfo3),
+ .match = conntrack_mt_v3,
.checkentry = conntrack_mt_check,
.destroy = conntrack_mt_destroy,
.me = THIS_MODULE,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-07 22:58:51 +0000