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[IPV4] ip_gre: sendto/recvfrom NBMA address 

When GRE tunnel is in NBMA mode, this patch allows an application to use
a PF_PACKET socket to:
- send a packet to specific NBMA address with sendto()
- use recvfrom() to receive packet and check which NBMA address it came from

This is required to implement properly NHRP over GRE tunnel.

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Timo Teras 2007-10-23 20:31:53 -07:00 committed by David S. Miller
parent 16d14ef9f2
commit 6a5f44d7a0
1 changed files with 11 additions and 1 deletions
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12
net/ipv4/ip_gre.c
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@ -1033,7 +1033,6 @@ static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
#ifdef CONFIG_NET_IPGRE_BROADCAST
/* Nice toy. Unfortunately, useless in real life :-)
It allows to construct virtual multiprotocol broadcast "LAN"
over the Internet, provided multicast routing is tuned.
@ -1092,10 +1091,19 @@ static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
return -t->hlen;
}
static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr)
{
struct iphdr *iph = (struct iphdr*) skb_mac_header(skb);
memcpy(haddr, &iph->saddr, 4);
return 4;
}
static const struct header_ops ipgre_header_ops = {
.create = ipgre_header,
.parse = ipgre_header_parse,
};
#ifdef CONFIG_NET_IPGRE_BROADCAST
static int ipgre_open(struct net_device *dev)
{
struct ip_tunnel *t = netdev_priv(dev);
@ -1197,6 +1205,8 @@ static int ipgre_tunnel_init(struct net_device *dev)
dev->stop = ipgre_close;
}
#endif
} else {
dev->header_ops = &ipgre_header_ops;
}
if (!tdev && tunnel->parms.link)