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ip_tunnels: extend iptunnel_xmit()
authorPravin B Shelar <pshelar@nicira.com>
Tue, 18 Jun 2013 00:49:56 +0000 (17:49 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 20 Jun 2013 01:07:41 +0000 (18:07 -0700)
Refactor various ip tunnels xmit functions and extend iptunnel_xmit()
so that there is more code sharing.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/vxlan.c
include/net/ip_tunnels.h
net/ipv4/Makefile
net/ipv4/ip_tunnel.c
net/ipv4/ip_tunnel_core.c [new file with mode: 0644]
net/ipv6/sit.c

index f6dce13..284c6c0 100644 (file)
@@ -1021,7 +1021,6 @@ static netdev_tx_t 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 iphdr *iph;
        struct vxlanhdr *vxh;
        struct udphdr *uh;
        struct flowi4 fl4;
@@ -1030,6 +1029,7 @@ static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
         u32 vni;
        __be16 df = 0;
        __u8 tos, ttl;
+       int err;
 
        dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
        vni = rdst->remote_vni;
@@ -1097,13 +1097,6 @@ static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
                vxlan_encap_bypass(skb, vxlan, dst_vxlan);
                return NETDEV_TX_OK;
        }
-
-       memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-       IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
-                             IPSKB_REROUTED);
-       skb_dst_drop(skb);
-       skb_dst_set(skb, &rt->dst);
-
        vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
        vxh->vx_flags = htonl(VXLAN_FLAGS);
        vxh->vx_vni = htonl(vni << 8);
@@ -1118,27 +1111,18 @@ static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
        uh->len = htons(skb->len);
        uh->check = 0;
 
-       __skb_push(skb, sizeof(*iph));
-       skb_reset_network_header(skb);
-       iph             = ip_hdr(skb);
-       iph->version    = 4;
-       iph->ihl        = sizeof(struct iphdr) >> 2;
-       iph->frag_off   = df;
-       iph->protocol   = IPPROTO_UDP;
-       iph->tos        = ip_tunnel_ecn_encap(tos, old_iph, skb);
-       iph->daddr      = dst;
-       iph->saddr      = fl4.saddr;
-       iph->ttl        = ttl ? : ip4_dst_hoplimit(&rt->dst);
-       tunnel_ip_select_ident(skb, old_iph, &rt->dst);
-
-       nf_reset(skb);
-
        vxlan_set_owner(dev, skb);
 
        if (handle_offloads(skb))
                goto drop;
 
-       iptunnel_xmit(skb, dev);
+       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);
+       iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
+
        return NETDEV_TX_OK;
 
 drop:
index 1be442f..b84f1ab 100644 (file)
@@ -155,23 +155,27 @@ static inline void tunnel_ip_select_ident(struct sk_buff *skb,
                                  (skb_shinfo(skb)->gso_segs ?: 1) - 1);
 }
 
-static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
+int iptunnel_xmit(struct net *net, struct rtable *rt,
+                 struct sk_buff *skb,
+                 __be32 src, __be32 dst, __u8 proto,
+                 __u8 tos, __u8 ttl, __be16 df);
+
+static inline void iptunnel_xmit_stats(int err,
+                                      struct net_device_stats *err_stats,
+                                      struct pcpu_tstats __percpu *stats)
 {
-       int err;
-       int pkt_len = skb->len - skb_transport_offset(skb);
-       struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats);
+       if (err > 0) {
+               struct pcpu_tstats *tstats = this_cpu_ptr(stats);
 
-       nf_reset(skb);
-
-       err = ip_local_out(skb);
-       if (likely(net_xmit_eval(err) == 0)) {
                u64_stats_update_begin(&tstats->syncp);
-               tstats->tx_bytes += pkt_len;
+               tstats->tx_bytes += err;
                tstats->tx_packets++;
                u64_stats_update_end(&tstats->syncp);
+       } else if (err < 0) {
+               err_stats->tx_errors++;
+               err_stats->tx_aborted_errors++;
        } else {
-               dev->stats.tx_errors++;
-               dev->stats.tx_aborted_errors++;
+               err_stats->tx_dropped++;
        }
 }
 #endif /* __NET_IP_TUNNELS_H */
index 7fcf810..86ded0b 100644 (file)
@@ -11,7 +11,7 @@ obj-y     := route.o inetpeer.o protocol.o \
             tcp_offload.o datagram.o raw.o udp.o udplite.o \
             udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
             fib_frontend.o fib_semantics.o fib_trie.o \
-            inet_fragment.o ping.o
+            inet_fragment.o ping.o ip_tunnel_core.o
 
 obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
 obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
index e189db4..a06a2ed 100644 (file)
@@ -491,19 +491,17 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
 {
        struct ip_tunnel *tunnel = netdev_priv(dev);
        const struct iphdr *inner_iph;
-       struct iphdr *iph;
        struct flowi4 fl4;
        u8     tos, ttl;
        __be16 df;
        struct rtable *rt;              /* Route to the other host */
-       struct net_device *tdev;        /* Device to other host */
        unsigned int max_headroom;      /* The extra header space needed */
        __be32 dst;
        int mtu;
+       int err;
 
        inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
 
-       memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
        dst = tnl_params->daddr;
        if (dst == 0) {
                /* NBMA tunnel */
@@ -571,14 +569,11 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
                dev->stats.tx_carrier_errors++;
                goto tx_error;
        }
-       tdev = rt->dst.dev;
-
-       if (tdev == dev) {
+       if (rt->dst.dev == dev) {
                ip_rt_put(rt);
                dev->stats.collisions++;
                goto tx_error;
        }
-
        df = tnl_params->frag_off;
 
        if (df)
@@ -596,6 +591,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
                if (!skb_is_gso(skb) &&
                    (inner_iph->frag_off&htons(IP_DF)) &&
                     mtu < ntohs(inner_iph->tot_len)) {
+                       memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
                        icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
                        ip_rt_put(rt);
                        goto tx_error;
@@ -646,8 +642,8 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
                        ttl = ip4_dst_hoplimit(&rt->dst);
        }
 
-       max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr)
-                                              + rt->dst.header_len;
+       max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
+                       + rt->dst.header_len;
        if (max_headroom > dev->needed_headroom) {
                dev->needed_headroom = max_headroom;
                if (skb_cow_head(skb, dev->needed_headroom)) {
@@ -657,27 +653,11 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
                }
        }
 
-       skb_dst_drop(skb);
-       skb_dst_set(skb, &rt->dst);
-
-       /* Push down and install the IP header. */
-       skb_push(skb, sizeof(struct iphdr));
-       skb_reset_network_header(skb);
-
-       iph = ip_hdr(skb);
-       inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
+       err = iptunnel_xmit(dev_net(dev), rt, skb,
+                           fl4.saddr, fl4.daddr, protocol,
+                           ip_tunnel_ecn_encap(tos, inner_iph, skb), ttl, df);
+       iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
 
-       iph->version    =       4;
-       iph->ihl        =       sizeof(struct iphdr) >> 2;
-       iph->frag_off   =       df;
-       iph->protocol   =       protocol;
-       iph->tos        =       ip_tunnel_ecn_encap(tos, inner_iph, skb);
-       iph->daddr      =       fl4.daddr;
-       iph->saddr      =       fl4.saddr;
-       iph->ttl        =       ttl;
-       tunnel_ip_select_ident(skb, inner_iph, &rt->dst);
-
-       iptunnel_xmit(skb, dev);
        return;
 
 #if IS_ENABLED(CONFIG_IPV6)
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
new file mode 100644 (file)
index 0000000..927687e
--- /dev/null
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2013 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/in.h>
+#include <linux/if_arp.h>
+#include <linux/mroute.h>
+#include <linux/init.h>
+#include <linux/in6.h>
+#include <linux/inetdevice.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/protocol.h>
+#include <net/ip_tunnels.h>
+#include <net/arp.h>
+#include <net/checksum.h>
+#include <net/dsfield.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/rtnetlink.h>
+
+int iptunnel_xmit(struct net *net, struct rtable *rt,
+                 struct sk_buff *skb,
+                 __be32 src, __be32 dst, __u8 proto,
+                 __u8 tos, __u8 ttl, __be16 df)
+{
+       int pkt_len = skb->len;
+       struct iphdr *iph;
+       int err;
+
+       nf_reset(skb);
+       secpath_reset(skb);
+       skb->rxhash = 0;
+       skb_dst_drop(skb);
+       skb_dst_set(skb, &rt->dst);
+       memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+
+       /* Push down and install the IP header. */
+       __skb_push(skb, sizeof(struct iphdr));
+       skb_reset_network_header(skb);
+
+       iph = ip_hdr(skb);
+
+       iph->version    =       4;
+       iph->ihl        =       sizeof(struct iphdr) >> 2;
+       iph->frag_off   =       df;
+       iph->protocol   =       proto;
+       iph->tos        =       tos;
+       iph->daddr      =       dst;
+       iph->saddr      =       src;
+       iph->ttl        =       ttl;
+       tunnel_ip_select_ident(skb,
+                              (const struct iphdr *)skb_inner_network_header(skb),
+                              &rt->dst);
+
+       err = ip_local_out(skb);
+       if (unlikely(net_xmit_eval(err)))
+               pkt_len = 0;
+       return pkt_len;
+}
+EXPORT_SYMBOL_GPL(iptunnel_xmit);
index 6b9c1f1..76bb8de 100644 (file)
@@ -723,13 +723,14 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
        __be16 df = tiph->frag_off;
        struct rtable *rt;                      /* Route to the other host */
        struct net_device *tdev;                /* Device to other host */
-       struct iphdr  *iph;                     /* Our new IP header */
        unsigned int max_headroom;              /* The extra header space needed */
        __be32 dst = tiph->daddr;
        struct flowi4 fl4;
        int    mtu;
        const struct in6_addr *addr6;
        int addr_type;
+       u8 ttl;
+       int err;
 
        if (skb->protocol != htons(ETH_P_IPV6))
                goto tx_error;
@@ -872,34 +873,14 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
                skb = new_skb;
                iph6 = ipv6_hdr(skb);
        }
-
-       skb->transport_header = skb->network_header;
-       skb_push(skb, sizeof(struct iphdr));
-       skb_reset_network_header(skb);
-       memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-       IPCB(skb)->flags = 0;
-       skb_dst_drop(skb);
-       skb_dst_set(skb, &rt->dst);
-
-       /*
-        *      Push down and install the IPIP header.
-        */
-
-       iph                     =       ip_hdr(skb);
-       iph->version            =       4;
-       iph->ihl                =       sizeof(struct iphdr)>>2;
-       iph->frag_off           =       df;
-       iph->protocol           =       IPPROTO_IPV6;
-       iph->tos                =       INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
-       iph->daddr              =       fl4.daddr;
-       iph->saddr              =       fl4.saddr;
-
-       if ((iph->ttl = tiph->ttl) == 0)
-               iph->ttl        =       iph6->hop_limit;
-
-       skb->ip_summed = CHECKSUM_NONE;
-       ip_select_ident(iph, skb_dst(skb), NULL);
-       iptunnel_xmit(skb, dev);
+       ttl = tiph->ttl;
+       if (ttl == 0)
+               ttl = iph6->hop_limit;
+       tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
+
+       err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, fl4.daddr,
+                           IPPROTO_IPV6, tos, ttl, df);
+       iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
        return NETDEV_TX_OK;
 
 tx_error_icmp: