[PATCH 4.19 023/101] vrf: check accept_source_route on the original netdevice

[Greg Kroah-Hartman]

[ 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 <ssuryae...@gmail.com>
Reviewed-by: David Ahern <dsah...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.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(-)

diff --git a/include/net/ip.h b/include/net/ip.h
index 71d31e4d4391..cfc3dd5ff085 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -648,7 +648,7 @@ 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
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index bd8ef4f87c79..c3a0683e83df 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -258,11 +258,10 @@ 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.
@@ -298,7 +297,7 @@ 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;
        }
 
@@ -354,7 +353,7 @@ 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);
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index 32a35043c9f5..3db31bb9df50 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -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);
-- 
2.19.1