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Date: Thu, 13 Jun 2013 11:24:44 -0700
From: Pravin B Shelar <pshelar@...ira.com>
To: netdev@...r.kernel.org, dev@...nvswitch.org
Cc: Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH net-next 06/12] ip_tunnel: push generic protocol handling to ip_tunnel module.
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@...ira.com>
---
include/net/ip_tunnels.h | 1 +
net/ipv4/gre.c | 3 ++-
net/ipv4/ip_tunnel.c | 30 ++++++------------------------
net/ipv4/ip_tunnel_core.c | 33 +++++++++++++++++++++++++++++++++
net/ipv4/ipip.c | 6 +++++-
net/ipv6/sit.c | 7 ++++++-
6 files changed, 53 insertions(+), 27 deletions(-)
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 788fa5d..048a97f 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -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,
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index 5ecc9c4..ba4803e 100644
--- a/net/ipv4/gre.c
+++ b/net/ipv4/gre.c
@@ -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)
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index b7b8d15..c41faf8 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -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;
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 927687e..6007518 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -86,3 +86,36 @@ 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);
+ 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);
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 9df7ecd..e6905fb 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -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) {
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 76bb8de..6cee844 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -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) {
--
1.7.1
--
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