diff options
Diffstat (limited to 'net/ipv4/netfilter/nf_nat_l3proto_ipv4.c')
-rw-r--r-- | net/ipv4/netfilter/nf_nat_l3proto_ipv4.c | 135 |
1 files changed, 56 insertions, 79 deletions
diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c index 325e02956bf5..6115bf1ff6f0 100644 --- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c @@ -241,33 +241,18 @@ int nf_nat_icmp_reply_translation(struct sk_buff *skb, } EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation); -unsigned int +static unsigned int nf_nat_ipv4_fn(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - unsigned int (*do_chain)(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state)) + const struct nf_hook_state *state) { struct nf_conn *ct; enum ip_conntrack_info ctinfo; - struct nf_conn_nat *nat; - /* maniptype == SRC for postrouting. */ - enum nf_nat_manip_type maniptype = HOOK2MANIP(state->hook); ct = nf_ct_get(skb, &ctinfo); - /* Can't track? It's not due to stress, or conntrack would - * have dropped it. Hence it's the user's responsibilty to - * packet filter it out, or implement conntrack/NAT for that - * protocol. 8) --RR - */ if (!ct) return NF_ACCEPT; - nat = nfct_nat(ct); - - switch (ctinfo) { - case IP_CT_RELATED: - case IP_CT_RELATED_REPLY: + if (ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY) { if (ip_hdr(skb)->protocol == IPPROTO_ICMP) { if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, state->hook)) @@ -275,76 +260,30 @@ nf_nat_ipv4_fn(void *priv, struct sk_buff *skb, else return NF_ACCEPT; } - /* Only ICMPs can be IP_CT_IS_REPLY: */ - /* fall through */ - case IP_CT_NEW: - /* Seen it before? This can happen for loopback, retrans, - * or local packets. - */ - if (!nf_nat_initialized(ct, maniptype)) { - unsigned int ret; - - ret = do_chain(priv, skb, state); - if (ret != NF_ACCEPT) - return ret; - - if (nf_nat_initialized(ct, HOOK2MANIP(state->hook))) - break; - - ret = nf_nat_alloc_null_binding(ct, state->hook); - if (ret != NF_ACCEPT) - return ret; - } else { - pr_debug("Already setup manip %s for ct %p\n", - maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST", - ct); - if (nf_nat_oif_changed(state->hook, ctinfo, nat, - state->out)) - goto oif_changed; - } - break; - - default: - /* ESTABLISHED */ - WARN_ON(ctinfo != IP_CT_ESTABLISHED && - ctinfo != IP_CT_ESTABLISHED_REPLY); - if (nf_nat_oif_changed(state->hook, ctinfo, nat, state->out)) - goto oif_changed; } - return nf_nat_packet(ct, ctinfo, state->hook, skb); - -oif_changed: - nf_ct_kill_acct(ct, ctinfo, skb); - return NF_DROP; + return nf_nat_inet_fn(priv, skb, state); } EXPORT_SYMBOL_GPL(nf_nat_ipv4_fn); -unsigned int +static unsigned int nf_nat_ipv4_in(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - unsigned int (*do_chain)(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state)) + const struct nf_hook_state *state) { unsigned int ret; __be32 daddr = ip_hdr(skb)->daddr; - ret = nf_nat_ipv4_fn(priv, skb, state, do_chain); + ret = nf_nat_ipv4_fn(priv, skb, state); if (ret != NF_DROP && ret != NF_STOLEN && daddr != ip_hdr(skb)->daddr) skb_dst_drop(skb); return ret; } -EXPORT_SYMBOL_GPL(nf_nat_ipv4_in); -unsigned int +static unsigned int nf_nat_ipv4_out(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - unsigned int (*do_chain)(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state)) + const struct nf_hook_state *state) { #ifdef CONFIG_XFRM const struct nf_conn *ct; @@ -353,7 +292,7 @@ nf_nat_ipv4_out(void *priv, struct sk_buff *skb, #endif unsigned int ret; - ret = nf_nat_ipv4_fn(priv, skb, state, do_chain); + ret = nf_nat_ipv4_fn(priv, skb, state); #ifdef CONFIG_XFRM if (ret != NF_DROP && ret != NF_STOLEN && !(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) && @@ -373,21 +312,17 @@ nf_nat_ipv4_out(void *priv, struct sk_buff *skb, #endif return ret; } -EXPORT_SYMBOL_GPL(nf_nat_ipv4_out); -unsigned int +static unsigned int nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - unsigned int (*do_chain)(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state)) + const struct nf_hook_state *state) { const struct nf_conn *ct; enum ip_conntrack_info ctinfo; unsigned int ret; int err; - ret = nf_nat_ipv4_fn(priv, skb, state, do_chain); + ret = nf_nat_ipv4_fn(priv, skb, state); if (ret != NF_DROP && ret != NF_STOLEN && (ct = nf_ct_get(skb, &ctinfo)) != NULL) { enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); @@ -411,7 +346,49 @@ nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb, } return ret; } -EXPORT_SYMBOL_GPL(nf_nat_ipv4_local_fn); + +static const struct nf_hook_ops nf_nat_ipv4_ops[] = { + /* Before packet filtering, change destination */ + { + .hook = nf_nat_ipv4_in, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_PRE_ROUTING, + .priority = NF_IP_PRI_NAT_DST, + }, + /* After packet filtering, change source */ + { + .hook = nf_nat_ipv4_out, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_POST_ROUTING, + .priority = NF_IP_PRI_NAT_SRC, + }, + /* Before packet filtering, change destination */ + { + .hook = nf_nat_ipv4_local_fn, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_NAT_DST, + }, + /* After packet filtering, change source */ + { + .hook = nf_nat_ipv4_fn, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_IN, + .priority = NF_IP_PRI_NAT_SRC, + }, +}; + +int nf_nat_l3proto_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops) +{ + return nf_nat_register_fn(net, ops, nf_nat_ipv4_ops, ARRAY_SIZE(nf_nat_ipv4_ops)); +} +EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv4_register_fn); + +void nf_nat_l3proto_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops) +{ + nf_nat_unregister_fn(net, ops, ARRAY_SIZE(nf_nat_ipv4_ops)); +} +EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv4_unregister_fn); static int __init nf_nat_l3proto_ipv4_init(void) { |