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vrf: check accept_source_route on the original netdevice 

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>
This commit is contained in:
Stephen Suryaputra 2019-04-01 09:17:32 -04:00 committed by David S. Miller
parent 8c1074f690
commit 8c83f2df9c
3 changed files with 6 additions and 7 deletions
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2
include/net/ip.h
View File

@ -677,7 +677,7 @@ int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
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

7
net/ipv4/ip_input.c
View File

@ -257,11 +257,10 @@ 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.
@ -297,7 +296,7 @@ static inline bool ip_rcv_options(struct sk_buff *skb)
}
}
if (ip_options_rcv_srr(skb))
if (ip_options_rcv_srr(skb, dev))
goto drop;
}
@ -353,7 +352,7 @@ static int ip_rcv_finish_core(struct net *net, struct sock *sk,
}
#endif
if (iph->ihl > 5 && ip_rcv_options(skb))
if (iph->ihl > 5 && ip_rcv_options(skb, dev))
goto drop;
rt = skb_rtable(skb);

4
net/ipv4/ip_options.c
View File

@ -612,7 +612,7 @@ 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)
{
struct ip_options *opt = &(IPCB(skb)->opt);
int srrspace, srrptr;
@ -647,7 +647,7 @@ int ip_options_rcv_srr(struct sk_buff *skb)
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);