| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20220706160021.10710-1-matthias.may@westermo.com>
Date: Wed, 6 Jul 2022 18:00:22 +0200
From: Matthias May <matthias.may@...termo.com>
To: <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <yoshfuji@...ux-ipv6.org>,
<dsahern@...nel.org>, <edumazet@...gle.com>, <kuba@...nel.org>,
<pabeni@...hat.com>, <linux-kernel@...r.kernel.org>,
Matthias May <matthias.may@...termo.com>
Subject: [PATCH net-next v2] ip_tunnel: allow to inherit from VLAN encapsulated IP frames
The current code allows to inherit the TOS, TTL, DF from the payload
when skb->protocol is ETH_P_IP or ETH_P_IPV6.
However when the payload is VLAN encapsulated (e.g because the tunnel
is of type GRETAP), then this inheriting does not work, because the
visible skb->protocol is of type ETH_P_8021Q.
Add a check on ETH_P_8021Q and subsequently check the payload protocol.
Signed-off-by: Matthias May <matthias.may@...termo.com>
---
v1 -> v2:
- Add support for ETH_P_8021AD as suggested by Jakub Kicinski.
---
net/ipv4/ip_tunnel.c | 22 ++++++++++++++--------
1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 94017a8c3994..bdcc0f1e83c8 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -648,6 +648,13 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
u8 tos, ttl;
__be32 dst;
__be16 df;
+ __be16 *payload_protocol;
+
+ if (skb->protocol == htons(ETH_P_8021Q) ||
+ skb->protocol == htons(ETH_P_8021AD))
+ payload_protocol = (__be16 *)(skb->head + skb->network_header - 2);
+ else
+ payload_protocol = &skb->protocol;
inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
connected = (tunnel->parms.iph.daddr != 0);
@@ -670,13 +677,12 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
dst = tun_info->key.u.ipv4.dst;
md = true;
connected = true;
- }
- else if (skb->protocol == htons(ETH_P_IP)) {
+ } else if (*payload_protocol == htons(ETH_P_IP)) {
rt = skb_rtable(skb);
dst = rt_nexthop(rt, inner_iph->daddr);
}
#if IS_ENABLED(CONFIG_IPV6)
- else if (skb->protocol == htons(ETH_P_IPV6)) {
+ else if (*payload_protocol == htons(ETH_P_IPV6)) {
const struct in6_addr *addr6;
struct neighbour *neigh;
bool do_tx_error_icmp;
@@ -716,10 +722,10 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
tos = tnl_params->tos;
if (tos & 0x1) {
tos &= ~0x1;
- if (skb->protocol == htons(ETH_P_IP)) {
+ if (*payload_protocol == htons(ETH_P_IP)) {
tos = inner_iph->tos;
connected = false;
- } else if (skb->protocol == htons(ETH_P_IPV6)) {
+ } else if (*payload_protocol == htons(ETH_P_IPV6)) {
tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
connected = false;
}
@@ -765,7 +771,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
}
df = tnl_params->frag_off;
- if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df)
+ if (*payload_protocol == htons(ETH_P_IP) && !tunnel->ignore_df)
df |= (inner_iph->frag_off & htons(IP_DF));
if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, 0, 0, false)) {
@@ -786,10 +792,10 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
ttl = tnl_params->ttl;
if (ttl == 0) {
- if (skb->protocol == htons(ETH_P_IP))
+ if (*payload_protocol == htons(ETH_P_IP))
ttl = inner_iph->ttl;
#if IS_ENABLED(CONFIG_IPV6)
- else if (skb->protocol == htons(ETH_P_IPV6))
+ else if (*payload_protocol == htons(ETH_P_IPV6))
ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
#endif
else
--
2.35.1
Powered by blists - more mailing lists