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netfilter: xt_conntrack: Support bit-shifting for CONNMARK & MARK targets. 

This patch introduces a new feature that allows bitshifting (left
and right) operations to co-operate with existing iptables options.

Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Jack Ma <jack.ma@alliedtelesis.co.nz>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Jack Ma 2018-03-19 09:41:59 +13:00 committed by Pablo Neira Ayuso
parent d72133e628
commit 472a73e007
2 changed files with 70 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/uapi/linux/netfilter/xt_connmark.h
View File

@ -19,11 +19,21 @@ enum {
XT_CONNMARK_RESTORE
};
enum {
D_SHIFT_LEFT = 0,
D_SHIFT_RIGHT,
};
struct xt_connmark_tginfo1 {
__u32 ctmark, ctmask, nfmask;
__u8 mode;
};
struct xt_connmark_tginfo2 {
__u32 ctmark, ctmask, nfmask;
__u8 shift_dir, shift_bits, mode;
};
struct xt_connmark_mtinfo1 {
__u32 mark, mask;
__u8 invert;

77
net/netfilter/xt_connmark.c
View File

@ -36,9 +36,10 @@ MODULE_ALIAS("ipt_connmark");
MODULE_ALIAS("ip6t_connmark");
static unsigned int
connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
connmark_tg_shift(struct sk_buff *skb,
const struct xt_connmark_tginfo1 *info,
u8 shift_bits, u8 shift_dir)
{
const struct xt_connmark_tginfo1 *info = par->targinfo;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
u_int32_t newmark;
@ -50,6 +51,10 @@ connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
switch (info->mode) {
case XT_CONNMARK_SET:
newmark = (ct->mark & ~info->ctmask) ^ info->ctmark;
if (shift_dir == D_SHIFT_RIGHT)
newmark >>= shift_bits;
else
newmark <<= shift_bits;
if (ct->mark != newmark) {
ct->mark = newmark;
nf_conntrack_event_cache(IPCT_MARK, ct);
@ -57,7 +62,11 @@ connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
break;
case XT_CONNMARK_SAVE:
newmark = (ct->mark & ~info->ctmask) ^
(skb->mark & info->nfmask);
(skb->mark & info->nfmask);
if (shift_dir == D_SHIFT_RIGHT)
newmark >>= shift_bits;
else
newmark <<= shift_bits;
if (ct->mark != newmark) {
ct->mark = newmark;
nf_conntrack_event_cache(IPCT_MARK, ct);
@ -65,14 +74,34 @@ connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
break;
case XT_CONNMARK_RESTORE:
newmark = (skb->mark & ~info->nfmask) ^
(ct->mark & info->ctmask);
(ct->mark & info->ctmask);
if (shift_dir == D_SHIFT_RIGHT)
newmark >>= shift_bits;
else
newmark <<= shift_bits;
skb->mark = newmark;
break;
}
return XT_CONTINUE;
}
static unsigned int
connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_connmark_tginfo1 *info = par->targinfo;
return connmark_tg_shift(skb, info, 0, 0);
}
static unsigned int
connmark_tg_v2(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_connmark_tginfo2 *info = par->targinfo;
return connmark_tg_shift(skb, (const struct xt_connmark_tginfo1 *)info,
info->shift_bits, info->shift_dir);
}
static int connmark_tg_check(const struct xt_tgchk_param *par)
{
int ret;
@ -119,15 +148,27 @@ static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
nf_ct_netns_put(par->net, par->family);
}
static struct xt_target connmark_tg_reg __read_mostly = {
.name = "CONNMARK",
.revision = 1,
.family = NFPROTO_UNSPEC,
.checkentry = connmark_tg_check,
.target = connmark_tg,
.targetsize = sizeof(struct xt_connmark_tginfo1),
.destroy = connmark_tg_destroy,
.me = THIS_MODULE,
static struct xt_target connmark_tg_reg[] __read_mostly = {
{
.name = "CONNMARK",
.revision = 1,
.family = NFPROTO_UNSPEC,
.checkentry = connmark_tg_check,
.target = connmark_tg,
.targetsize = sizeof(struct xt_connmark_tginfo1),
.destroy = connmark_tg_destroy,
.me = THIS_MODULE,
},
{
.name = "CONNMARK",
.revision = 2,
.family = NFPROTO_UNSPEC,
.checkentry = connmark_tg_check,
.target = connmark_tg_v2,
.targetsize = sizeof(struct xt_connmark_tginfo2),
.destroy = connmark_tg_destroy,
.me = THIS_MODULE,
}
};
static struct xt_match connmark_mt_reg __read_mostly = {
@ -145,12 +186,14 @@ static int __init connmark_mt_init(void)
{
int ret;
ret = xt_register_target(&connmark_tg_reg);
ret = xt_register_targets(connmark_tg_reg,
ARRAY_SIZE(connmark_tg_reg));
if (ret < 0)
return ret;
ret = xt_register_match(&connmark_mt_reg);
if (ret < 0) {
xt_unregister_target(&connmark_tg_reg);
xt_unregister_targets(connmark_tg_reg,
ARRAY_SIZE(connmark_tg_reg));
return ret;
}
return 0;
@ -159,7 +202,7 @@ static int __init connmark_mt_init(void)
static void __exit connmark_mt_exit(void)
{
xt_unregister_match(&connmark_mt_reg);
xt_unregister_target(&connmark_tg_reg);
xt_unregister_target(connmark_tg_reg);
}
module_init(connmark_mt_init);