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kernel: backport flow offload pppoe fix

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Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2024-04-23 12:08:45 +02:00
parent 1991bfb814
commit 98834a4c3f
9 changed files with 340 additions and 6 deletions
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85
target/linux/generic/backport-5.15/741-v6.9-01-netfilter-flowtable-validate-pppoe-header.patch Normal file
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@ -0,0 +1,85 @@
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 11 Apr 2024 13:28:59 +0200
Subject: [PATCH] netfilter: flowtable: validate pppoe header
Ensure there is sufficient room to access the protocol field of the
PPPoe header. Validate it once before the flowtable lookup, then use a
helper function to access protocol field.
Reported-by: syzbot+b6f07e1c07ef40199081@syzkaller.appspotmail.com
Fixes: 72efd585f714 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -318,7 +318,7 @@ int nf_flow_rule_route_ipv6(struct net *
int nf_flow_table_offload_init(void);
void nf_flow_table_offload_exit(void);
-static inline __be16 nf_flow_pppoe_proto(const struct sk_buff *skb)
+static inline __be16 __nf_flow_pppoe_proto(const struct sk_buff *skb)
{
__be16 proto;
@@ -334,4 +334,14 @@ static inline __be16 nf_flow_pppoe_proto
return 0;
}
+static inline bool nf_flow_pppoe_proto(struct sk_buff *skb, __be16 *inner_proto)
+{
+ if (!pskb_may_pull(skb, PPPOE_SES_HLEN))
+ return false;
+
+ *inner_proto = __nf_flow_pppoe_proto(skb);
+
+ return true;
+}
+
#endif /* _NF_FLOW_TABLE_H */
--- a/net/netfilter/nf_flow_table_inet.c
+++ b/net/netfilter/nf_flow_table_inet.c
@@ -21,7 +21,8 @@ nf_flow_offload_inet_hook(void *priv, st
proto = veth->h_vlan_encapsulated_proto;
break;
case htons(ETH_P_PPP_SES):
- proto = nf_flow_pppoe_proto(skb);
+ if (!nf_flow_pppoe_proto(skb, &proto))
+ return NF_ACCEPT;
break;
default:
proto = skb->protocol;
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -246,10 +246,11 @@ static unsigned int nf_flow_xmit_xfrm(st
return NF_STOLEN;
}
-static bool nf_flow_skb_encap_protocol(const struct sk_buff *skb, __be16 proto,
+static bool nf_flow_skb_encap_protocol(struct sk_buff *skb, __be16 proto,
u32 *offset)
{
struct vlan_ethhdr *veth;
+ __be16 inner_proto;
switch (skb->protocol) {
case htons(ETH_P_8021Q):
@@ -260,7 +261,8 @@ static bool nf_flow_skb_encap_protocol(c
}
break;
case htons(ETH_P_PPP_SES):
- if (nf_flow_pppoe_proto(skb) == proto) {
+ if (nf_flow_pppoe_proto(skb, &inner_proto) &&
+ inner_proto == proto) {
*offset += PPPOE_SES_HLEN;
return true;
}
@@ -289,7 +291,7 @@ static void nf_flow_encap_pop(struct sk_
skb_reset_network_header(skb);
break;
case htons(ETH_P_PPP_SES):
- skb->protocol = nf_flow_pppoe_proto(skb);
+ skb->protocol = __nf_flow_pppoe_proto(skb);
skb_pull(skb, PPPOE_SES_HLEN);
skb_reset_network_header(skb);
break;

24
target/linux/generic/backport-5.15/741-v6.9-02-netfilter-flowtable-incorrect-pppoe-tuple.patch Normal file
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@ -0,0 +1,24 @@
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 11 Apr 2024 13:29:00 +0200
Subject: [PATCH] netfilter: flowtable: incorrect pppoe tuple
pppoe traffic reaching ingress path does not match the flowtable entry
because the pppoe header is expected to be at the network header offset.
This bug causes a mismatch in the flow table lookup, so pppoe packets
enter the classical forwarding path.
Fixes: 72efd585f714 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -156,7 +156,7 @@ static void nf_flow_tuple_encap(struct s
tuple->encap[i].proto = skb->protocol;
break;
case htons(ETH_P_PPP_SES):
- phdr = (struct pppoe_hdr *)skb_mac_header(skb);
+ phdr = (struct pppoe_hdr *)skb_network_header(skb);
tuple->encap[i].id = ntohs(phdr->sid);
tuple->encap[i].proto = skb->protocol;
break;

87
target/linux/generic/backport-6.1/740-v6.9-01-netfilter-flowtable-validate-pppoe-header.patch Normal file
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@ -0,0 +1,87 @@
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 11 Apr 2024 13:28:59 +0200
Subject: [PATCH] netfilter: flowtable: validate pppoe header
Ensure there is sufficient room to access the protocol field of the
PPPoe header. Validate it once before the flowtable lookup, then use a
helper function to access protocol field.
Reported-by: syzbot+b6f07e1c07ef40199081@syzkaller.appspotmail.com
Fixes: 72efd585f714 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -335,7 +335,7 @@ int nf_flow_rule_route_ipv6(struct net *
int nf_flow_table_offload_init(void);
void nf_flow_table_offload_exit(void);
-static inline __be16 nf_flow_pppoe_proto(const struct sk_buff *skb)
+static inline __be16 __nf_flow_pppoe_proto(const struct sk_buff *skb)
{
__be16 proto;
@@ -351,6 +351,16 @@ static inline __be16 nf_flow_pppoe_proto
return 0;
}
+static inline bool nf_flow_pppoe_proto(struct sk_buff *skb, __be16 *inner_proto)
+{
+ if (!pskb_may_pull(skb, PPPOE_SES_HLEN))
+ return false;
+
+ *inner_proto = __nf_flow_pppoe_proto(skb);
+
+ return true;
+}
+
#define NF_FLOW_TABLE_STAT_INC(net, count) __this_cpu_inc((net)->ft.stat->count)
#define NF_FLOW_TABLE_STAT_DEC(net, count) __this_cpu_dec((net)->ft.stat->count)
#define NF_FLOW_TABLE_STAT_INC_ATOMIC(net, count) \
--- a/net/netfilter/nf_flow_table_inet.c
+++ b/net/netfilter/nf_flow_table_inet.c
@@ -21,7 +21,8 @@ nf_flow_offload_inet_hook(void *priv, st
proto = veth->h_vlan_encapsulated_proto;
break;
case htons(ETH_P_PPP_SES):
- proto = nf_flow_pppoe_proto(skb);
+ if (!nf_flow_pppoe_proto(skb, &proto))
+ return NF_ACCEPT;
break;
default:
proto = skb->protocol;
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -267,10 +267,11 @@ static unsigned int nf_flow_xmit_xfrm(st
return NF_STOLEN;
}
-static bool nf_flow_skb_encap_protocol(const struct sk_buff *skb, __be16 proto,
+static bool nf_flow_skb_encap_protocol(struct sk_buff *skb, __be16 proto,
u32 *offset)
{
struct vlan_ethhdr *veth;
+ __be16 inner_proto;
switch (skb->protocol) {
case htons(ETH_P_8021Q):
@@ -281,7 +282,8 @@ static bool nf_flow_skb_encap_protocol(c
}
break;
case htons(ETH_P_PPP_SES):
- if (nf_flow_pppoe_proto(skb) == proto) {
+ if (nf_flow_pppoe_proto(skb, &inner_proto) &&
+ inner_proto == proto) {
*offset += PPPOE_SES_HLEN;
return true;
}
@@ -310,7 +312,7 @@ static void nf_flow_encap_pop(struct sk_
skb_reset_network_header(skb);
break;
case htons(ETH_P_PPP_SES):
- skb->protocol = nf_flow_pppoe_proto(skb);
+ skb->protocol = __nf_flow_pppoe_proto(skb);
skb_pull(skb, PPPOE_SES_HLEN);
skb_reset_network_header(skb);
break;

24
target/linux/generic/backport-6.1/740-v6.9-02-netfilter-flowtable-incorrect-pppoe-tuple.patch Normal file
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@ -0,0 +1,24 @@
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 11 Apr 2024 13:29:00 +0200
Subject: [PATCH] netfilter: flowtable: incorrect pppoe tuple
pppoe traffic reaching ingress path does not match the flowtable entry
because the pppoe header is expected to be at the network header offset.
This bug causes a mismatch in the flow table lookup, so pppoe packets
enter the classical forwarding path.
Fixes: 72efd585f714 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -156,7 +156,7 @@ static void nf_flow_tuple_encap(struct s
tuple->encap[i].proto = skb->protocol;
break;
case htons(ETH_P_PPP_SES):
- phdr = (struct pppoe_hdr *)skb_mac_header(skb);
+ phdr = (struct pppoe_hdr *)skb_network_header(skb);
tuple->encap[i].id = ntohs(phdr->sid);
tuple->encap[i].proto = skb->protocol;
break;

87
target/linux/generic/backport-6.6/740-v6.9-01-netfilter-flowtable-validate-pppoe-header.patch Normal file
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@ -0,0 +1,87 @@
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 11 Apr 2024 13:28:59 +0200
Subject: [PATCH] netfilter: flowtable: validate pppoe header
Ensure there is sufficient room to access the protocol field of the
PPPoe header. Validate it once before the flowtable lookup, then use a
helper function to access protocol field.
Reported-by: syzbot+b6f07e1c07ef40199081@syzkaller.appspotmail.com
Fixes: 72efd585f714 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -335,7 +335,7 @@ int nf_flow_rule_route_ipv6(struct net *
int nf_flow_table_offload_init(void);
void nf_flow_table_offload_exit(void);
-static inline __be16 nf_flow_pppoe_proto(const struct sk_buff *skb)
+static inline __be16 __nf_flow_pppoe_proto(const struct sk_buff *skb)
{
__be16 proto;
@@ -351,6 +351,16 @@ static inline __be16 nf_flow_pppoe_proto
return 0;
}
+static inline bool nf_flow_pppoe_proto(struct sk_buff *skb, __be16 *inner_proto)
+{
+ if (!pskb_may_pull(skb, PPPOE_SES_HLEN))
+ return false;
+
+ *inner_proto = __nf_flow_pppoe_proto(skb);
+
+ return true;
+}
+
#define NF_FLOW_TABLE_STAT_INC(net, count) __this_cpu_inc((net)->ft.stat->count)
#define NF_FLOW_TABLE_STAT_DEC(net, count) __this_cpu_dec((net)->ft.stat->count)
#define NF_FLOW_TABLE_STAT_INC_ATOMIC(net, count) \
--- a/net/netfilter/nf_flow_table_inet.c
+++ b/net/netfilter/nf_flow_table_inet.c
@@ -21,7 +21,8 @@ nf_flow_offload_inet_hook(void *priv, st
proto = veth->h_vlan_encapsulated_proto;
break;
case htons(ETH_P_PPP_SES):
- proto = nf_flow_pppoe_proto(skb);
+ if (!nf_flow_pppoe_proto(skb, &proto))
+ return NF_ACCEPT;
break;
default:
proto = skb->protocol;
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -273,10 +273,11 @@ static unsigned int nf_flow_xmit_xfrm(st
return NF_STOLEN;
}
-static bool nf_flow_skb_encap_protocol(const struct sk_buff *skb, __be16 proto,
+static bool nf_flow_skb_encap_protocol(struct sk_buff *skb, __be16 proto,
u32 *offset)
{
struct vlan_ethhdr *veth;
+ __be16 inner_proto;
switch (skb->protocol) {
case htons(ETH_P_8021Q):
@@ -287,7 +288,8 @@ static bool nf_flow_skb_encap_protocol(c
}
break;
case htons(ETH_P_PPP_SES):
- if (nf_flow_pppoe_proto(skb) == proto) {
+ if (nf_flow_pppoe_proto(skb, &inner_proto) &&
+ inner_proto == proto) {
*offset += PPPOE_SES_HLEN;
return true;
}
@@ -316,7 +318,7 @@ static void nf_flow_encap_pop(struct sk_
skb_reset_network_header(skb);
break;
case htons(ETH_P_PPP_SES):
- skb->protocol = nf_flow_pppoe_proto(skb);
+ skb->protocol = __nf_flow_pppoe_proto(skb);
skb_pull(skb, PPPOE_SES_HLEN);
skb_reset_network_header(skb);
break;

24
target/linux/generic/backport-6.6/740-v6.9-02-netfilter-flowtable-incorrect-pppoe-tuple.patch Normal file
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@ -0,0 +1,24 @@
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 11 Apr 2024 13:29:00 +0200
Subject: [PATCH] netfilter: flowtable: incorrect pppoe tuple
pppoe traffic reaching ingress path does not match the flowtable entry
because the pppoe header is expected to be at the network header offset.
This bug causes a mismatch in the flow table lookup, so pppoe packets
enter the classical forwarding path.
Fixes: 72efd585f714 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -157,7 +157,7 @@ static void nf_flow_tuple_encap(struct s
tuple->encap[i].proto = skb->protocol;
break;
case htons(ETH_P_PPP_SES):
- phdr = (struct pppoe_hdr *)skb_mac_header(skb);
+ phdr = (struct pppoe_hdr *)skb_network_header(skb);
tuple->encap[i].id = ntohs(phdr->sid);
tuple->encap[i].proto = skb->protocol;
break;

5
target/linux/generic/hack-5.15/650-netfilter-add-xt_FLOWOFFLOAD-target.patch
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@ -98,7 +98,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
--- /dev/null
+++ b/net/netfilter/xt_FLOWOFFLOAD.c
@@ -0,0 +1,701 @@
@@ -0,0 +1,702 @@
+/*
+ * Copyright (C) 2018-2021 Felix Fietkau <nbd@nbd.name>
+ *
@ -163,7 +163,8 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ proto = veth->h_vlan_encapsulated_proto;
+ break;
+ case htons(ETH_P_PPP_SES):
+ proto = nf_flow_pppoe_proto(skb);
+ if (!nf_flow_pppoe_proto(skb, &proto))
+ return NF_ACCEPT;
+ break;
+ default:
+ proto = skb->protocol;

5
target/linux/generic/hack-6.1/650-netfilter-add-xt_FLOWOFFLOAD-target.patch
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@ -44,7 +44,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
--- /dev/null
+++ b/net/netfilter/xt_FLOWOFFLOAD.c
@@ -0,0 +1,702 @@
@@ -0,0 +1,703 @@
+/*
+ * Copyright (C) 2018-2021 Felix Fietkau <nbd@nbd.name>
+ *
@ -109,7 +109,8 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ proto = veth->h_vlan_encapsulated_proto;
+ break;
+ case htons(ETH_P_PPP_SES):
+ proto = nf_flow_pppoe_proto(skb);
+ if (!nf_flow_pppoe_proto(skb, &proto))
+ return NF_ACCEPT;
+ break;
+ default:
+ proto = skb->protocol;

5
target/linux/generic/hack-6.6/650-netfilter-add-xt_FLOWOFFLOAD-target.patch
View File

@ -44,7 +44,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
--- /dev/null
+++ b/net/netfilter/xt_FLOWOFFLOAD.c
@@ -0,0 +1,702 @@
@@ -0,0 +1,703 @@
+/*
+ * Copyright (C) 2018-2021 Felix Fietkau <nbd@nbd.name>
+ *
@ -109,7 +109,8 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ proto = veth->h_vlan_encapsulated_proto;
+ break;
+ case htons(ETH_P_PPP_SES):
+ proto = nf_flow_pppoe_proto(skb);
+ if (!nf_flow_pppoe_proto(skb, &proto))
+ return NF_ACCEPT;
+ break;
+ default:
+ proto = skb->protocol;