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-rw-r--r--net/ipv4/netfilter/arptable_filter.c30
-rw-r--r--net/ipv4/netfilter/iptable_filter.c50
-rw-r--r--net/ipv4/netfilter/iptable_mangle.c71
-rw-r--r--net/ipv4/netfilter/iptable_raw.c26
-rw-r--r--net/ipv4/netfilter/iptable_security.c50
5 files changed, 75 insertions, 152 deletions
diff --git a/net/ipv4/netfilter/arptable_filter.c b/net/ipv4/netfilter/arptable_filter.c
index 97337601827a..e9d823b149cd 100644
--- a/net/ipv4/netfilter/arptable_filter.c
+++ b/net/ipv4/netfilter/arptable_filter.c
@@ -53,43 +53,37 @@ static const struct xt_table packet_filter = {
};
/* The work comes in here from netfilter.c */
-static unsigned int arpt_in_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
+static unsigned int
+arptable_filter_hook(unsigned int hook, struct sk_buff *skb,
+ const struct net_device *in, const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
{
- return arpt_do_table(skb, hook, in, out,
- dev_net(in)->ipv4.arptable_filter);
-}
+ if (hook == NF_ARP_OUT)
+ return arpt_do_table(skb, hook, in, out,
+ dev_net(out)->ipv4.arptable_filter);
-static unsigned int arpt_out_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
+ /* INPUT/FORWARD: */
return arpt_do_table(skb, hook, in, out,
- dev_net(out)->ipv4.arptable_filter);
+ dev_net(in)->ipv4.arptable_filter);
}
static struct nf_hook_ops arpt_ops[] __read_mostly = {
{
- .hook = arpt_in_hook,
+ .hook = arptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_ARP,
.hooknum = NF_ARP_IN,
.priority = NF_IP_PRI_FILTER,
},
{
- .hook = arpt_out_hook,
+ .hook = arptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_ARP,
.hooknum = NF_ARP_OUT,
.priority = NF_IP_PRI_FILTER,
},
{
- .hook = arpt_in_hook,
+ .hook = arptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_ARP,
.hooknum = NF_ARP_FORWARD,
diff --git a/net/ipv4/netfilter/iptable_filter.c b/net/ipv4/netfilter/iptable_filter.c
index dee90eb8aa47..5369833ad56a 100644
--- a/net/ipv4/netfilter/iptable_filter.c
+++ b/net/ipv4/netfilter/iptable_filter.c
@@ -60,61 +60,43 @@ static const struct xt_table packet_filter = {
.af = NFPROTO_IPV4,
};
-/* The work comes in here from netfilter.c. */
static unsigned int
-ipt_local_in_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
+iptable_filter_hook(unsigned int hook, struct sk_buff *skb,
+ const struct net_device *in, const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
{
- return ipt_do_table(skb, hook, in, out,
- dev_net(in)->ipv4.iptable_filter);
-}
+ if (hook == NF_INET_LOCAL_OUT) {
+ if (skb->len < sizeof(struct iphdr) ||
+ ip_hdrlen(skb) < sizeof(struct iphdr))
+ /* root is playing with raw sockets. */
+ return NF_ACCEPT;
+
+ return ipt_do_table(skb, hook, in, out,
+ dev_net(out)->ipv4.iptable_filter);
+ }
-static unsigned int
-ipt_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
+ /* LOCAL_IN/FORWARD: */
return ipt_do_table(skb, hook, in, out,
dev_net(in)->ipv4.iptable_filter);
}
-static unsigned int
-ipt_local_out_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- /* root is playing with raw sockets. */
- if (skb->len < sizeof(struct iphdr) ||
- ip_hdrlen(skb) < sizeof(struct iphdr))
- return NF_ACCEPT;
- return ipt_do_table(skb, hook, in, out,
- dev_net(out)->ipv4.iptable_filter);
-}
-
static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
- .hook = ipt_local_in_hook,
+ .hook = iptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_FILTER,
},
{
- .hook = ipt_hook,
+ .hook = iptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_FILTER,
},
{
- .hook = ipt_local_out_hook,
+ .hook = iptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index e07bf242343a..4e699cd275c6 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -71,51 +71,6 @@ static const struct xt_table packet_mangler = {
.af = NFPROTO_IPV4,
};
-/* The work comes in here from netfilter.c. */
-static unsigned int
-ipt_pre_routing_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- return ipt_do_table(skb, hook, in, out,
- dev_net(in)->ipv4.iptable_mangle);
-}
-
-static unsigned int
-ipt_post_routing_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- return ipt_do_table(skb, hook, in, out,
- dev_net(out)->ipv4.iptable_mangle);
-}
-
-static unsigned int
-ipt_local_in_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- return ipt_do_table(skb, hook, in, out,
- dev_net(in)->ipv4.iptable_mangle);
-}
-
-static unsigned int
-ipt_forward_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- return ipt_do_table(skb, hook, in, out,
- dev_net(in)->ipv4.iptable_mangle);
-}
-
static unsigned int
ipt_local_hook(unsigned int hook,
struct sk_buff *skb,
@@ -158,37 +113,53 @@ ipt_local_hook(unsigned int hook,
return ret;
}
+/* The work comes in here from netfilter.c. */
+static unsigned int
+iptable_mangle_hook(unsigned int hook,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ if (hook == NF_INET_LOCAL_OUT)
+ return ipt_local_hook(hook, skb, in, out, okfn);
+
+ /* PREROUTING/INPUT/FORWARD: */
+ return ipt_do_table(skb, hook, in, out,
+ dev_net(in)->ipv4.iptable_mangle);
+}
+
static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
- .hook = ipt_pre_routing_hook,
+ .hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_MANGLE,
},
{
- .hook = ipt_local_in_hook,
+ .hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_MANGLE,
},
{
- .hook = ipt_forward_hook,
+ .hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_MANGLE,
},
{
- .hook = ipt_local_hook,
+ .hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_MANGLE,
},
{
- .hook = ipt_post_routing_hook,
+ .hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_POST_ROUTING,
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c
index 40f2b9f611a2..2c55575e89f5 100644
--- a/net/ipv4/netfilter/iptable_raw.c
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -45,23 +45,15 @@ static const struct xt_table packet_raw = {
/* The work comes in here from netfilter.c. */
static unsigned int
-ipt_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
+iptable_raw_hook(unsigned int hook, struct sk_buff *skb,
+ const struct net_device *in, const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
{
- return ipt_do_table(skb, hook, in, out,
- dev_net(in)->ipv4.iptable_raw);
-}
+ if (hook == NF_INET_PRE_ROUTING)
+ return ipt_do_table(skb, hook, in, out,
+ dev_net(in)->ipv4.iptable_raw);
-static unsigned int
-ipt_local_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
+ /* OUTPUT: */
/* root is playing with raw sockets. */
if (skb->len < sizeof(struct iphdr) ||
ip_hdrlen(skb) < sizeof(struct iphdr))
@@ -73,14 +65,14 @@ ipt_local_hook(unsigned int hook,
/* 'raw' is the very first table. */
static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
- .hook = ipt_hook,
+ .hook = iptable_raw_hook,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_RAW,
.owner = THIS_MODULE,
},
{
- .hook = ipt_local_hook,
+ .hook = iptable_raw_hook,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_RAW,
diff --git a/net/ipv4/netfilter/iptable_security.c b/net/ipv4/netfilter/iptable_security.c
index 7ce2366e4305..1c666bab3269 100644
--- a/net/ipv4/netfilter/iptable_security.c
+++ b/net/ipv4/netfilter/iptable_security.c
@@ -65,59 +65,43 @@ static const struct xt_table security_table = {
};
static unsigned int
-ipt_local_in_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
+iptable_security_hook(unsigned int hook, struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
{
- return ipt_do_table(skb, hook, in, out,
- dev_net(in)->ipv4.iptable_security);
-}
+ if (hook == NF_INET_LOCAL_OUT) {
+ if (skb->len < sizeof(struct iphdr) ||
+ ip_hdrlen(skb) < sizeof(struct iphdr))
+ /* Somebody is playing with raw sockets. */
+ return NF_ACCEPT;
-static unsigned int
-ipt_forward_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- return ipt_do_table(skb, hook, in, out,
- dev_net(in)->ipv4.iptable_security);
-}
+ return ipt_do_table(skb, hook, in, out,
+ dev_net(out)->ipv4.iptable_security);
+ }
-static unsigned int
-ipt_local_out_hook(unsigned int hook,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- /* Somebody is playing with raw sockets. */
- if (skb->len < sizeof(struct iphdr) ||
- ip_hdrlen(skb) < sizeof(struct iphdr))
- return NF_ACCEPT;
+ /* INPUT/FORWARD: */
return ipt_do_table(skb, hook, in, out,
- dev_net(out)->ipv4.iptable_security);
+ dev_net(in)->ipv4.iptable_security);
}
static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
- .hook = ipt_local_in_hook,
+ .hook = iptable_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_SECURITY,
},
{
- .hook = ipt_forward_hook,
+ .hook = iptable_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_SECURITY,
},
{
- .hook = ipt_local_out_hook,
+ .hook = iptable_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.