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ip_tunnel: push generic protocol handling to ip_tunnel module.

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Process skb tunnel header before sending packet to protocol handler.
this allows code sharing between gre and ovs gre modules.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-06-17 17:50:02 -07:00 committed by David S. Miller
parent 0e6fbc5b6c
commit 3d7b46cd20
6 changed files with 54 additions and 27 deletions
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1
include/net/ip_tunnels.h
View File

@ -155,6 +155,7 @@ static inline void tunnel_ip_select_ident(struct sk_buff *skb,
(skb_shinfo(skb)->gso_segs ?: 1) - 1);
}
int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
int iptunnel_xmit(struct net *net, struct rtable *rt,
struct sk_buff *skb,
__be32 src, __be32 dst, __u8 proto,

3
net/ipv4/gre.c
View File

@ -201,7 +201,8 @@ static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
return -EINVAL;
}
}
return 0;
return iptunnel_pull_header(skb, hdr_len, tpi->proto);
}
static int gre_cisco_rcv(struct sk_buff *skb)

30
net/ipv4/ip_tunnel.c
View File

@ -408,13 +408,6 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
const struct iphdr *iph = ip_hdr(skb);
int err;
secpath_reset(skb);
skb->protocol = tpi->proto;
skb->mac_header = skb->network_header;
__pskb_pull(skb, tunnel->hlen);
skb_postpull_rcsum(skb, skb_transport_header(skb), tunnel->hlen);
#ifdef CONFIG_NET_IPGRE_BROADCAST
if (ipv4_is_multicast(iph->daddr)) {
/* Looped back packet, drop it! */
@ -442,23 +435,6 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
tunnel->i_seqno = ntohl(tpi->seq) + 1;
}
/* Warning: All skb pointers will be invalidated! */
if (tunnel->dev->type == ARPHRD_ETHER) {
if (!pskb_may_pull(skb, ETH_HLEN)) {
tunnel->dev->stats.rx_length_errors++;
tunnel->dev->stats.rx_errors++;
goto drop;
}
iph = ip_hdr(skb);
skb->protocol = eth_type_trans(skb, tunnel->dev);
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
}
skb->pkt_type = PACKET_HOST;
__skb_tunnel_rx(skb, tunnel->dev);
skb_reset_network_header(skb);
err = IP_ECN_decapsulate(iph, skb);
if (unlikely(err)) {
if (log_ecn_error)
@ -477,6 +453,12 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
tstats->rx_bytes += skb->len;
u64_stats_update_end(&tstats->syncp);
if (tunnel->dev->type == ARPHRD_ETHER) {
skb->protocol = eth_type_trans(skb, tunnel->dev);
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
} else {
skb->dev = tunnel->dev;
}
gro_cells_receive(&tunnel->gro_cells, skb);
return 0;

34
net/ipv4/ip_tunnel_core.c
View File

@ -86,3 +86,37 @@ int iptunnel_xmit(struct net *net, struct rtable *rt,
return pkt_len;
}
EXPORT_SYMBOL_GPL(iptunnel_xmit);
int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
{
if (unlikely(!pskb_may_pull(skb, hdr_len)))
return -ENOMEM;
skb_pull_rcsum(skb, hdr_len);
if (inner_proto == htons(ETH_P_TEB)) {
struct ethhdr *eh = (struct ethhdr *)skb->data;
if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
return -ENOMEM;
if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN))
skb->protocol = eh->h_proto;
else
skb->protocol = htons(ETH_P_802_2);
} else {
skb->protocol = inner_proto;
}
nf_reset(skb);
secpath_reset(skb);
if (!skb->l4_rxhash)
skb->rxhash = 0;
skb_dst_drop(skb);
skb->vlan_tci = 0;
skb_set_queue_mapping(skb, 0);
skb->pkt_type = PACKET_HOST;
return 0;
}
EXPORT_SYMBOL_GPL(iptunnel_pull_header);

6
net/ipv4/ipip.c
View File

@ -188,8 +188,12 @@ static int ipip_rcv(struct sk_buff *skb)
struct net *net = dev_net(skb->dev);
struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
struct ip_tunnel *tunnel;
const struct iphdr *iph = ip_hdr(skb);
const struct iphdr *iph;
if (iptunnel_pull_header(skb, 0, tpi.proto))
goto drop;
iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
iph->saddr, iph->daddr, 0);
if (tunnel) {

7
net/ipv6/sit.c
View File

@ -640,9 +640,14 @@ static const struct tnl_ptk_info tpi = {
static int ipip_rcv(struct sk_buff *skb)
{
const struct iphdr *iph = ip_hdr(skb);
const struct iphdr *iph;
struct ip_tunnel *tunnel;
if (iptunnel_pull_header(skb, 0, tpi.proto))
goto drop;
iph = ip_hdr(skb);
tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
iph->saddr, iph->daddr);
if (tunnel != NULL) {