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Commit 20704bd1 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

erspan: build the header with the right proto according to erspan_ver 



As said in draft-foschiano-erspan-03#section4:

   Different frame variants known as "ERSPAN Types" can be
   distinguished based on the GRE "Protocol Type" field value: Type I
   and II's value is 0x88BE while Type III's is 0x22EB [ETYPES].

So set it properly in erspan_xmit() according to erspan_ver. While at
it, also remove the unused parameter 'proto' in erspan_fb_xmit().

Fixes: 94d7d8f2 ("ip6_gre: add erspan v2 support")
Reported-by: default avatarJianlin Shi <jishi@redhat.com>
Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 04a4af33

net/ipv4/ip_gre.c

+14 −9
Original line number Diff line number Diff line
@@ -569,8 +569,7 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, 
	dev->stats.tx_dropped++;

}



static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev,

			   __be16 proto)

static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev)

{

	struct ip_tunnel *tunnel = netdev_priv(dev);

	struct ip_tunnel_info *tun_info;
@@ -578,10 +577,10 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev, 
	struct erspan_metadata *md;

	struct rtable *rt = NULL;

	bool truncate = false;

	__be16 df, proto;

	struct flowi4 fl;

	int tunnel_hlen;

	int version;

	__be16 df;

	int nhoff;

	int thoff;
@@ -626,18 +625,20 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev, 
	if (version == 1) {

		erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)),

				    ntohl(md->u.index), truncate, true);

		proto = htons(ETH_P_ERSPAN);

	} else if (version == 2) {

		erspan_build_header_v2(skb,

				       ntohl(tunnel_id_to_key32(key->tun_id)),

				       md->u.md2.dir,

				       get_hwid(&md->u.md2),

				       truncate, true);

		proto = htons(ETH_P_ERSPAN2);

	} else {

		goto err_free_rt;

	}



	gre_build_header(skb, 8, TUNNEL_SEQ,

			 htons(ETH_P_ERSPAN), 0, htonl(tunnel->o_seqno++));

			 proto, 0, htonl(tunnel->o_seqno++));



	df = key->tun_flags & TUNNEL_DONT_FRAGMENT ?  htons(IP_DF) : 0;
@@ -721,12 +722,13 @@ static netdev_tx_t erspan_xmit(struct sk_buff *skb, 
{

	struct ip_tunnel *tunnel = netdev_priv(dev);

	bool truncate = false;

	__be16 proto;



	if (!pskb_inet_may_pull(skb))

		goto free_skb;



	if (tunnel->collect_md) {

		erspan_fb_xmit(skb, dev, skb->protocol);

		erspan_fb_xmit(skb, dev);

		return NETDEV_TX_OK;

	}
@@ -742,19 +744,22 @@ static netdev_tx_t erspan_xmit(struct sk_buff *skb, 
	}



	/* Push ERSPAN header */

	if (tunnel->erspan_ver == 1)

	if (tunnel->erspan_ver == 1) {

		erspan_build_header(skb, ntohl(tunnel->parms.o_key),

				    tunnel->index,

				    truncate, true);

	else if (tunnel->erspan_ver == 2)

		proto = htons(ETH_P_ERSPAN);

	} else if (tunnel->erspan_ver == 2) {

		erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key),

				       tunnel->dir, tunnel->hwid,

				       truncate, true);

	else

		proto = htons(ETH_P_ERSPAN2);

	} else {

		goto free_skb;

	}



	tunnel->parms.o_flags &= ~TUNNEL_KEY;

	__gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_ERSPAN));

	__gre_xmit(skb, dev, &tunnel->parms.iph, proto);

	return NETDEV_TX_OK;



free_skb:

net/ipv6/ip6_gre.c

+4 −2
Original line number Diff line number Diff line
@@ -922,6 +922,7 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 
	__u8 dsfield = false;

	struct flowi6 fl6;

	int err = -EINVAL;

	__be16 proto;

	__u32 mtu;

	int nhoff;

	int thoff;
@@ -1035,8 +1036,9 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 
	}



	/* Push GRE header. */

	gre_build_header(skb, 8, TUNNEL_SEQ,

			 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));

	proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)

					   : htons(ETH_P_ERSPAN2);

	gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));



	/* TooBig packet may have updated dst->dev's mtu */

	if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)