From: Stephen Suryaputra ssuryaextr@gmail.com
[ Upstream commit 8c83f2df9c6578ea4c5b940d8238ad8a41b87e9e ]
Configuration check to accept source route IP options should be made on the incoming netdevice when the skb->dev is an l3mdev master. The route lookup for the source route next hop also needs the incoming netdev.
v2->v3: - Simplify by passing the original netdevice down the stack (per David Ahern).
Signed-off-by: Stephen Suryaputra ssuryaextr@gmail.com Reviewed-by: David Ahern dsahern@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/ip.h | 2 +- net/ipv4/ip_input.c | 7 +++---- net/ipv4/ip_options.c | 4 ++-- 3 files changed, 6 insertions(+), 7 deletions(-)
--- a/include/net/ip.h +++ b/include/net/ip.h @@ -580,7 +580,7 @@ int ip_options_get_from_user(struct net unsigned char __user *data, int optlen); void ip_options_undo(struct ip_options *opt); void ip_forward_options(struct sk_buff *skb); -int ip_options_rcv_srr(struct sk_buff *skb); +int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev);
/* * Functions provided by ip_sockglue.c --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -259,11 +259,10 @@ int ip_local_deliver(struct sk_buff *skb ip_local_deliver_finish); }
-static inline bool ip_rcv_options(struct sk_buff *skb) +static inline bool ip_rcv_options(struct sk_buff *skb, struct net_device *dev) { struct ip_options *opt; const struct iphdr *iph; - struct net_device *dev = skb->dev;
/* It looks as overkill, because not all IP options require packet mangling. @@ -299,7 +298,7 @@ static inline bool ip_rcv_options(struct } }
- if (ip_options_rcv_srr(skb)) + if (ip_options_rcv_srr(skb, dev)) goto drop; }
@@ -361,7 +360,7 @@ static int ip_rcv_finish(struct net *net } #endif
- if (iph->ihl > 5 && ip_rcv_options(skb)) + if (iph->ihl > 5 && ip_rcv_options(skb, dev)) goto drop;
rt = skb_rtable(skb); --- a/net/ipv4/ip_options.c +++ b/net/ipv4/ip_options.c @@ -614,7 +614,7 @@ void ip_forward_options(struct sk_buff * } }
-int ip_options_rcv_srr(struct sk_buff *skb) +int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev) { struct ip_options *opt = &(IPCB(skb)->opt); int srrspace, srrptr; @@ -649,7 +649,7 @@ int ip_options_rcv_srr(struct sk_buff *s
orefdst = skb->_skb_refdst; skb_dst_set(skb, NULL); - err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev); + err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, dev); rt2 = skb_rtable(skb); if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) { skb_dst_drop(skb);