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openwrt/target/linux/generic/pending-5.10/640-13-netfilter-flowtable-...

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From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Mon, 1 Mar 2021 23:52:49 +0100
Subject: [PATCH] netfilter: flowtable: add pppoe support
---
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -1453,7 +1453,7 @@ static void ppp_dev_priv_destructor(stru
static int ppp_fill_forward_path(struct net_device_path_ctx *ctx,
struct net_device_path *path)
{
- struct ppp *ppp = netdev_priv(path->dev);
+ struct ppp *ppp = netdev_priv(ctx->dev);
struct ppp_channel *chan;
struct channel *pch;
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -987,6 +987,7 @@ static int pppoe_fill_forward_path(struc
path->type = DEV_PATH_PPPOE;
path->encap.proto = htons(ETH_P_PPP_SES);
path->encap.id = be16_to_cpu(po->num);
+ memcpy(path->encap.h_dest, po->pppoe_pa.remote, ETH_ALEN);
path->dev = ctx->dev;
ctx->dev = dev;
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -842,6 +842,7 @@ struct net_device_path {
struct {
u16 id;
__be16 proto;
+ u8 h_dest[ETH_ALEN];
} encap;
struct {
enum {
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -7,6 +7,9 @@
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/netdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_pppox.h>
+#include <linux/ppp_defs.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
@@ -162,6 +165,8 @@ static bool ip_has_options(unsigned int
static void nf_flow_tuple_encap(struct sk_buff *skb,
struct flow_offload_tuple *tuple)
{
+ struct vlan_ethhdr *veth;
+ struct pppoe_hdr *phdr;
int i = 0;
if (skb_vlan_tag_present(skb)) {
@@ -169,23 +174,35 @@ static void nf_flow_tuple_encap(struct s
tuple->encap[i].proto = skb->vlan_proto;
i++;
}
- if (skb->protocol == htons(ETH_P_8021Q)) {
- struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb_mac_header(skb);
-
+ switch (skb->protocol) {
+ case htons(ETH_P_8021Q):
+ veth = (struct vlan_ethhdr *)skb_mac_header(skb);
tuple->encap[i].id = ntohs(veth->h_vlan_TCI);
tuple->encap[i].proto = skb->protocol;
+ break;
+ case htons(ETH_P_PPP_SES):
+ phdr = (struct pppoe_hdr *)skb_mac_header(skb);
+ tuple->encap[i].id = ntohs(phdr->sid);
+ tuple->encap[i].proto = skb->protocol;
+ break;
}
}
static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev,
- struct flow_offload_tuple *tuple)
+ struct flow_offload_tuple *tuple, u32 *nhoff)
{
unsigned int thoff, hdrsize, offset = 0;
struct flow_ports *ports;
struct iphdr *iph;
- if (skb->protocol == htons(ETH_P_8021Q))
+ switch (skb->protocol) {
+ case htons(ETH_P_8021Q):
offset += VLAN_HLEN;
+ break;
+ case htons(ETH_P_PPP_SES):
+ offset += PPPOE_SES_HLEN;
+ break;
+ }
if (!pskb_may_pull(skb, sizeof(*iph) + offset))
return -1;
@@ -226,6 +243,7 @@ static int nf_flow_tuple_ip(struct sk_bu
tuple->l4proto = iph->protocol;
tuple->iifidx = dev->ifindex;
nf_flow_tuple_encap(skb, tuple);
+ *nhoff = offset;
return 0;
}
@@ -270,14 +288,36 @@ static unsigned int nf_flow_xmit_xfrm(st
return NF_STOLEN;
}
+static inline __be16 nf_flow_pppoe_proto(const struct sk_buff *skb)
+{
+ __be16 proto;
+
+ proto = *((__be16 *)(skb_mac_header(skb) + ETH_HLEN +
+ sizeof(struct pppoe_hdr)));
+ switch (proto) {
+ case htons(PPP_IP):
+ return htons(ETH_P_IP);
+ case htons(PPP_IPV6):
+ return htons(ETH_P_IPV6);
+ }
+
+ return 0;
+}
+
static bool nf_flow_skb_encap_protocol(const struct sk_buff *skb, __be16 proto)
{
- if (skb->protocol == htons(ETH_P_8021Q)) {
- struct vlan_ethhdr *veth;
+ struct vlan_ethhdr *veth;
+ switch (skb->protocol) {
+ case htons(ETH_P_8021Q):
veth = (struct vlan_ethhdr *)skb_mac_header(skb);
if (veth->h_vlan_encapsulated_proto == proto)
return true;
+ break;
+ case htons(ETH_P_PPP_SES):
+ if (nf_flow_pppoe_proto(skb) == proto)
+ return true;
+ break;
}
return false;
@@ -294,12 +334,18 @@ static void nf_flow_encap_pop(struct sk_
__vlan_hwaccel_clear_tag(skb);
continue;
}
- if (skb->protocol == htons(ETH_P_8021Q)) {
+ switch (skb->protocol) {
+ case htons(ETH_P_8021Q):
vlan_hdr = (struct vlan_hdr *)skb->data;
__skb_pull(skb, VLAN_HLEN);
vlan_set_encap_proto(skb, vlan_hdr);
skb_reset_network_header(skb);
break;
+ case htons(ETH_P_PPP_SES):
+ skb->protocol = nf_flow_pppoe_proto(skb);
+ skb_pull(skb, PPPOE_SES_HLEN);
+ skb_reset_network_header(skb);
+ break;
}
}
}
@@ -343,7 +389,7 @@ nf_flow_offload_ip_hook(void *priv, stru
!nf_flow_skb_encap_protocol(skb, htons(ETH_P_IP)))
return NF_ACCEPT;
- if (nf_flow_tuple_ip(skb, state->in, &tuple) < 0)
+ if (nf_flow_tuple_ip(skb, state->in, &tuple, &offset) < 0)
return NF_ACCEPT;
tuplehash = flow_offload_lookup(flow_table, &tuple);
@@ -357,9 +403,6 @@ nf_flow_offload_ip_hook(void *priv, stru
if (unlikely(nf_flow_exceeds_mtu(skb, mtu)))
return NF_ACCEPT;
- if (skb->protocol == htons(ETH_P_8021Q))
- offset += VLAN_HLEN;
-
if (skb_try_make_writable(skb, sizeof(*iph) + offset))
return NF_DROP;
@@ -543,14 +586,20 @@ static int nf_flow_nat_ipv6(const struct
}
static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev,
- struct flow_offload_tuple *tuple)
+ struct flow_offload_tuple *tuple, u32 *nhoff)
{
unsigned int thoff, hdrsize, offset = 0;
struct flow_ports *ports;
struct ipv6hdr *ip6h;
- if (skb->protocol == htons(ETH_P_8021Q))
+ switch (skb->protocol) {
+ case htons(ETH_P_8021Q):
offset += VLAN_HLEN;
+ break;
+ case htons(ETH_P_PPP_SES):
+ offset += PPPOE_SES_HLEN;
+ break;
+ }
if (!pskb_may_pull(skb, sizeof(*ip6h) + offset))
return -1;
@@ -586,6 +635,7 @@ static int nf_flow_tuple_ipv6(struct sk_
tuple->l4proto = ip6h->nexthdr;
tuple->iifidx = dev->ifindex;
nf_flow_tuple_encap(skb, tuple);
+ *nhoff = offset;
return 0;
}
@@ -611,7 +661,7 @@ nf_flow_offload_ipv6_hook(void *priv, st
!nf_flow_skb_encap_protocol(skb, htons(ETH_P_IPV6)))
return NF_ACCEPT;
- if (nf_flow_tuple_ipv6(skb, state->in, &tuple) < 0)
+ if (nf_flow_tuple_ipv6(skb, state->in, &tuple, &offset) < 0)
return NF_ACCEPT;
tuplehash = flow_offload_lookup(flow_table, &tuple);
@@ -625,9 +675,6 @@ nf_flow_offload_ipv6_hook(void *priv, st
if (unlikely(nf_flow_exceeds_mtu(skb, mtu)))
return NF_ACCEPT;
- if (skb->protocol == htons(ETH_P_8021Q))
- offset += VLAN_HLEN;
-
ip6h = (struct ipv6hdr *)(skb_network_header(skb) + offset);
if (nf_flow_state_check(flow, ip6h->nexthdr, skb, sizeof(*ip6h)))
return NF_ACCEPT;
--- a/net/netfilter/nft_flow_offload.c
+++ b/net/netfilter/nft_flow_offload.c
@@ -90,6 +90,7 @@ static void nft_dev_path_info(const stru
switch (path->type) {
case DEV_PATH_ETHERNET:
case DEV_PATH_VLAN:
+ case DEV_PATH_PPPOE:
info->indev = path->dev;
if (is_zero_ether_addr(info->h_source))
memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
@@ -97,7 +98,7 @@ static void nft_dev_path_info(const stru
if (path->type == DEV_PATH_ETHERNET)
break;
- /* DEV_PATH_VLAN */
+ /* DEV_PATH_VLAN and DEV_PATH_PPPOE */
if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) {
info->indev = NULL;
break;
@@ -106,6 +107,8 @@ static void nft_dev_path_info(const stru
info->encap[info->num_encaps].id = path->encap.id;
info->encap[info->num_encaps].proto = path->encap.proto;
info->num_encaps++;
+ if (path->type == DEV_PATH_PPPOE)
+ memcpy(info->h_dest, path->encap.h_dest, ETH_ALEN);
break;
case DEV_PATH_BRIDGE:
if (is_zero_ether_addr(info->h_source))
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