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Merge branch 'erspan-fixes'

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Xin Long says:

====================
ip_gre: a bunch of fixes for erspan

This patchset is to fix some issues that could cause 0 or low
performance, and even unexpected truncated packets on erspan.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-10-01 22:30:33 -07:00
commit c79c314bb4
1 changed files with 6 additions and 5 deletions
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11
net/ipv4/ip_gre.c
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@ -259,7 +259,6 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
struct ip_tunnel *tunnel;
struct erspanhdr *ershdr;
const struct iphdr *iph;
__be32 session_id;
__be32 index;
int len;
@ -275,8 +274,7 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
/* The original GRE header does not have key field,
* Use ERSPAN 10-bit session ID as key.
*/
session_id = cpu_to_be32(ntohs(ershdr->session_id));
tpi->key = session_id;
tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);
index = ershdr->md.index;
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,
tpi->flags | TUNNEL_KEY,
@ -733,7 +731,7 @@ static netdev_tx_t erspan_xmit(struct sk_buff *skb,
if (skb_cow_head(skb, dev->needed_headroom))
goto free_skb;
if (skb->len > dev->mtu) {
if (skb->len - dev->hard_header_len > dev->mtu) {
pskb_trim(skb, dev->mtu);
truncate = true;
}
@ -1247,13 +1245,16 @@ static int erspan_tunnel_init(struct net_device *dev)
tunnel->tun_hlen = 8;
tunnel->parms.iph.protocol = IPPROTO_GRE;
t_hlen = tunnel->hlen + sizeof(struct iphdr) + sizeof(struct erspanhdr);
tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
sizeof(struct erspanhdr);
t_hlen = tunnel->hlen + sizeof(struct iphdr);
dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4;
dev->mtu = ETH_DATA_LEN - t_hlen - 4;
dev->features |= GRE_FEATURES;
dev->hw_features |= GRE_FEATURES;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
netif_keep_dst(dev);
return ip_tunnel_init(dev);
}