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netfilter: nft_masq: add inet support 

This allows use of a single masquerade rule in nat inet family
to handle both ipv4 and ipv6.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2019-03-27 09:22:27 +01:00 committed by Pablo Neira Ayuso
parent 4806e97572
commit 071657d2c3
1 changed files with 64 additions and 0 deletions
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64
net/netfilter/nft_masq.c
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@ -218,6 +218,61 @@ static inline int nft_masq_module_init_ipv6(void) { return 0; }
static inline void nft_masq_module_exit_ipv6(void) {}
#endif
#ifdef CONFIG_NF_TABLES_INET
static void nft_masq_inet_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
switch (nft_pf(pkt)) {
case NFPROTO_IPV4:
return nft_masq_ipv4_eval(expr, regs, pkt);
case NFPROTO_IPV6:
return nft_masq_ipv6_eval(expr, regs, pkt);
}
WARN_ON_ONCE(1);
}
static void
nft_masq_inet_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
{
nf_ct_netns_put(ctx->net, NFPROTO_INET);
}
static struct nft_expr_type nft_masq_inet_type;
static const struct nft_expr_ops nft_masq_inet_ops = {
.type = &nft_masq_inet_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
.eval = nft_masq_inet_eval,
.init = nft_masq_init,
.destroy = nft_masq_inet_destroy,
.dump = nft_masq_dump,
.validate = nft_masq_validate,
};
static struct nft_expr_type nft_masq_inet_type __read_mostly = {
.family = NFPROTO_INET,
.name = "masq",
.ops = &nft_masq_inet_ops,
.policy = nft_masq_policy,
.maxattr = NFTA_MASQ_MAX,
.owner = THIS_MODULE,
};
static int __init nft_masq_module_init_inet(void)
{
return nft_register_expr(&nft_masq_inet_type);
}
static void nft_masq_module_exit_inet(void)
{
nft_unregister_expr(&nft_masq_inet_type);
}
#else
static inline int nft_masq_module_init_inet(void) { return 0; }
static inline void nft_masq_module_exit_inet(void) {}
#endif
static int __init nft_masq_module_init(void)
{
int ret;
@ -226,8 +281,15 @@ static int __init nft_masq_module_init(void)
if (ret < 0)
return ret;
ret = nft_masq_module_init_inet();
if (ret < 0) {
nft_masq_module_exit_ipv6();
return ret;
}
ret = nft_register_expr(&nft_masq_ipv4_type);
if (ret < 0) {
nft_masq_module_exit_inet();
nft_masq_module_exit_ipv6();
return ret;
}
@ -235,6 +297,7 @@ static int __init nft_masq_module_init(void)
ret = nf_nat_masquerade_ipv4_register_notifier();
if (ret < 0) {
nft_masq_module_exit_ipv6();
nft_masq_module_exit_inet();
nft_unregister_expr(&nft_masq_ipv4_type);
return ret;
}
@ -245,6 +308,7 @@ static int __init nft_masq_module_init(void)
static void __exit nft_masq_module_exit(void)
{
nft_masq_module_exit_ipv6();
nft_masq_module_exit_inet();
nft_unregister_expr(&nft_masq_ipv4_type);
nf_nat_masquerade_ipv4_unregister_notifier();
}