From 49560532d74962608526121ecb0d2ad0c87f9cc0 Mon Sep 17 00:00:00 2001 From: Pravin B Shelar Date: Mon, 19 Aug 2013 11:23:17 -0700 Subject: [PATCH] vxlan: Factor out vxlan send api. Following patch allows more code sharing between vxlan and ovs-vxlan. Signed-off-by: Pravin B Shelar Signed-off-by: David S. Miller --- drivers/net/vxlan.c | 91 +++++++++++++++++++++++++++++++---------------------- include/net/vxlan.h | 8 +++++ 2 files changed, 62 insertions(+), 37 deletions(-) diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index aab927b..f3496e9 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -1082,11 +1082,8 @@ static void vxlan_sock_put(struct sk_buff *skb) } /* On transmit, associate with the tunnel socket */ -static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) +static void vxlan_set_owner(struct sock *sk, struct sk_buff *skb) { - struct vxlan_dev *vxlan = netdev_priv(dev); - struct sock *sk = vxlan->vn_sock->sock->sk; - skb_orphan(skb); sock_hold(sk); skb->sk = sk; @@ -1098,9 +1095,9 @@ static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) * better and maybe available from hardware * secondary choice is to use jhash on the Ethernet header */ -static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) +__be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb) { - unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; + unsigned int range = (port_max - port_min) + 1; u32 hash; hash = skb_get_rxhash(skb); @@ -1108,8 +1105,9 @@ static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) hash = jhash(skb->data, 2 * ETH_ALEN, (__force u32) skb->protocol); - return htons((((u64) hash * range) >> 32) + vxlan->port_min); + return htons((((u64) hash * range) >> 32) + port_min); } +EXPORT_SYMBOL_GPL(vxlan_src_port); static int handle_offloads(struct sk_buff *skb) { @@ -1125,6 +1123,45 @@ static int handle_offloads(struct sk_buff *skb) return 0; } +int vxlan_xmit_skb(struct net *net, struct vxlan_sock *vs, + struct rtable *rt, struct sk_buff *skb, + __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, + __be16 src_port, __be16 dst_port, __be32 vni) +{ + struct vxlanhdr *vxh; + struct udphdr *uh; + int err; + + if (!skb->encapsulation) { + skb_reset_inner_headers(skb); + skb->encapsulation = 1; + } + + vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); + vxh->vx_flags = htonl(VXLAN_FLAGS); + vxh->vx_vni = vni; + + __skb_push(skb, sizeof(*uh)); + skb_reset_transport_header(skb); + uh = udp_hdr(skb); + + uh->dest = dst_port; + uh->source = src_port; + + uh->len = htons(skb->len); + uh->check = 0; + + vxlan_set_owner(vs->sock->sk, skb); + + err = handle_offloads(skb); + if (err) + return err; + + return iptunnel_xmit(net, rt, skb, src, dst, + IPPROTO_UDP, tos, ttl, df); +} +EXPORT_SYMBOL_GPL(vxlan_xmit_skb); + /* Bypass encapsulation if the destination is local */ static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, struct vxlan_dev *dst_vxlan) @@ -1162,8 +1199,6 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, struct vxlan_dev *vxlan = netdev_priv(dev); struct rtable *rt; const struct iphdr *old_iph; - struct vxlanhdr *vxh; - struct udphdr *uh; struct flowi4 fl4; __be32 dst; __be16 src_port, dst_port; @@ -1185,11 +1220,6 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, goto drop; } - if (!skb->encapsulation) { - skb_reset_inner_headers(skb); - skb->encapsulation = 1; - } - /* Need space for new headers (invalidates iph ptr) */ if (skb_cow_head(skb, VXLAN_HEADROOM)) goto drop; @@ -1204,7 +1234,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, if (tos == 1) tos = ip_tunnel_get_dsfield(old_iph, skb); - src_port = vxlan_src_port(vxlan, skb); + src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb); memset(&fl4, 0, sizeof(fl4)); fl4.flowi4_oif = rdst->remote_ifindex; @@ -1221,9 +1251,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, if (rt->dst.dev == dev) { netdev_dbg(dev, "circular route to %pI4\n", &dst); - ip_rt_put(rt); dev->stats.collisions++; - goto tx_error; + goto rt_tx_error; } /* Bypass encapsulation if the destination is local */ @@ -1238,30 +1267,16 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, vxlan_encap_bypass(skb, vxlan, dst_vxlan); return; } - vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); - vxh->vx_flags = htonl(VXLAN_FLAGS); - vxh->vx_vni = htonl(vni << 8); - - __skb_push(skb, sizeof(*uh)); - skb_reset_transport_header(skb); - uh = udp_hdr(skb); - - uh->dest = dst_port; - uh->source = src_port; - - uh->len = htons(skb->len); - uh->check = 0; - - vxlan_set_owner(dev, skb); - - if (handle_offloads(skb)) - goto drop; tos = ip_tunnel_ecn_encap(tos, old_iph, skb); ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); - err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst, - IPPROTO_UDP, tos, ttl, df); + err = vxlan_xmit_skb(dev_net(dev), vxlan->vn_sock, rt, skb, + fl4.saddr, dst, tos, ttl, df, + src_port, dst_port, htonl(vni << 8)); + + if (err < 0) + goto rt_tx_error; iptunnel_xmit_stats(err, &dev->stats, dev->tstats); return; @@ -1270,6 +1285,8 @@ drop: dev->stats.tx_dropped++; goto tx_free; +rt_tx_error: + ip_rt_put(rt); tx_error: dev->stats.tx_errors++; tx_free: diff --git a/include/net/vxlan.h b/include/net/vxlan.h index 43de275..ad342e3 100644 --- a/include/net/vxlan.h +++ b/include/net/vxlan.h @@ -28,4 +28,12 @@ struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port, bool no_share); void vxlan_sock_release(struct vxlan_sock *vs); + +int vxlan_xmit_skb(struct net *net, struct vxlan_sock *vs, + struct rtable *rt, struct sk_buff *skb, + __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, + __be16 src_port, __be16 dst_port, __be32 vni); + +__be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb); + #endif -- 2.7.4