From 125372faa4feb15e86f410c1adabbca9186d9c4a Mon Sep 17 00:00:00 2001 From: Jiri Benc Date: Tue, 3 May 2016 17:10:08 +0200 Subject: [PATCH] gre: receive also TEB packets for lwtunnels For ipgre interfaces in collect metadata mode, receive also traffic with encapsulated Ethernet headers. The lwtunnel users are supposed to sort this out correctly. This allows to have mixed Ethernet + L3-only traffic on the same lwtunnel interface. This is the same way as VXLAN-GPE behaves. To keep backwards compatibility and prevent any surprises, gretap interfaces have priority in receiving packets with Ethernet headers. Signed-off-by: Jiri Benc Signed-off-by: David S. Miller --- include/net/ip_tunnels.h | 1 + net/ipv4/ip_gre.c | 39 ++++++++++++++++++++++++++++----------- 2 files changed, 29 insertions(+), 11 deletions(-) diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h index 6d79091..d916b43 100644 --- a/include/net/ip_tunnels.h +++ b/include/net/ip_tunnels.h @@ -160,6 +160,7 @@ struct tnl_ptk_info { #define PACKET_RCVD 0 #define PACKET_REJECT 1 +#define PACKET_NEXT 2 #define IP_TNL_HASH_BITS 7 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 8f377da..2b267e7 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -260,26 +260,20 @@ static __be32 tunnel_id_to_key(__be64 x) #endif } -static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, - int hdr_len) +static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, + struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) { - struct net *net = dev_net(skb->dev); struct metadata_dst *tun_dst = NULL; - struct ip_tunnel_net *itn; const struct iphdr *iph; struct ip_tunnel *tunnel; - if (tpi->proto == htons(ETH_P_TEB)) - itn = net_generic(net, gre_tap_net_id); - else - itn = net_generic(net, ipgre_net_id); - iph = ip_hdr(skb); tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, iph->saddr, iph->daddr, tpi->key); if (tunnel) { - if (iptunnel_pull_header(skb, hdr_len, tpi->proto, false) < 0) + if (__iptunnel_pull_header(skb, hdr_len, tpi->proto, + raw_proto, false) < 0) goto drop; skb_pop_mac_header(skb); @@ -297,13 +291,36 @@ static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); return PACKET_RCVD; } - return PACKET_REJECT; + return PACKET_NEXT; drop: kfree_skb(skb); return PACKET_RCVD; } +static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, + int hdr_len) +{ + struct net *net = dev_net(skb->dev); + struct ip_tunnel_net *itn; + int res; + + if (tpi->proto == htons(ETH_P_TEB)) + itn = net_generic(net, gre_tap_net_id); + else + itn = net_generic(net, ipgre_net_id); + + res = __ipgre_rcv(skb, tpi, itn, hdr_len, false); + if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { + /* ipgre tunnels in collect metadata mode should receive + * also ETH_P_TEB traffic. + */ + itn = net_generic(net, ipgre_net_id); + res = __ipgre_rcv(skb, tpi, itn, hdr_len, true); + } + return res; +} + static int gre_rcv(struct sk_buff *skb) { struct tnl_ptk_info tpi; -- 2.7.4