From 6a5f44d7a048c97b8bae8ce464c97b8fad61ff99 Mon Sep 17 00:00:00 2001 From: Timo Teras Date: Tue, 23 Oct 2007 20:31:53 -0700 Subject: [PATCH] [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 Acked-by: Alexey Kuznetsov Signed-off-by: David S. Miller --- net/ipv4/ip_gre.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index f151900efaf9..c5b77bbbe844 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -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) -- 2.39.5