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https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
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ip_tunnels: extend iptunnel_xmit()
Refactor various ip tunnels xmit functions and extend iptunnel_xmit() so that there is more code sharing. Signed-off-by: Pravin B Shelar <[email protected]> Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Pravin B Shelar
David S. Miller
parent
45f2e9976c
commit
0e6fbc5b6c
6 changed files with 131 additions and 94 deletions
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@ -11,7 +11,7 @@ obj-y := route.o inetpeer.o protocol.o \
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tcp_offload.o datagram.o raw.o udp.o udplite.o \
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udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
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fib_frontend.o fib_semantics.o fib_trie.o \
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inet_fragment.o ping.o
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inet_fragment.o ping.o ip_tunnel_core.o
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obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
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obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
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@ -491,19 +491,17 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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const struct iphdr *inner_iph;
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struct iphdr *iph;
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struct flowi4 fl4;
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u8 tos, ttl;
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__be16 df;
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struct rtable *rt; /* Route to the other host */
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struct net_device *tdev; /* Device to other host */
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unsigned int max_headroom; /* The extra header space needed */
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__be32 dst;
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int mtu;
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int err;
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inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
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memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
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dst = tnl_params->daddr;
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if (dst == 0) {
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/* NBMA tunnel */
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@ -571,14 +569,11 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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dev->stats.tx_carrier_errors++;
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goto tx_error;
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}
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tdev = rt->dst.dev;
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if (tdev == dev) {
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if (rt->dst.dev == dev) {
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ip_rt_put(rt);
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dev->stats.collisions++;
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goto tx_error;
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}
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df = tnl_params->frag_off;
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if (df)
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@ -596,6 +591,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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if (!skb_is_gso(skb) &&
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(inner_iph->frag_off&htons(IP_DF)) &&
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mtu < ntohs(inner_iph->tot_len)) {
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memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
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icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
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ip_rt_put(rt);
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goto tx_error;
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@ -646,8 +642,8 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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ttl = ip4_dst_hoplimit(&rt->dst);
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}
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max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr)
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+ rt->dst.header_len;
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max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
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+ rt->dst.header_len;
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if (max_headroom > dev->needed_headroom) {
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dev->needed_headroom = max_headroom;
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if (skb_cow_head(skb, dev->needed_headroom)) {
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@ -657,27 +653,11 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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}
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}
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skb_dst_drop(skb);
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skb_dst_set(skb, &rt->dst);
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err = iptunnel_xmit(dev_net(dev), rt, skb,
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fl4.saddr, fl4.daddr, protocol,
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ip_tunnel_ecn_encap(tos, inner_iph, skb), ttl, df);
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iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
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/* Push down and install the IP header. */
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skb_push(skb, sizeof(struct iphdr));
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skb_reset_network_header(skb);
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iph = ip_hdr(skb);
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inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
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iph->version = 4;
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iph->ihl = sizeof(struct iphdr) >> 2;
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iph->frag_off = df;
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iph->protocol = protocol;
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iph->tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
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iph->daddr = fl4.daddr;
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iph->saddr = fl4.saddr;
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iph->ttl = ttl;
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tunnel_ip_select_ident(skb, inner_iph, &rt->dst);
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iptunnel_xmit(skb, dev);
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return;
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#if IS_ENABLED(CONFIG_IPV6)
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88
net/ipv4/ip_tunnel_core.c
Normal file
88
net/ipv4/ip_tunnel_core.c
Normal file
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@ -0,0 +1,88 @@
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/*
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* Copyright (c) 2013 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/if_arp.h>
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#include <linux/mroute.h>
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#include <linux/init.h>
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#include <linux/in6.h>
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#include <linux/inetdevice.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/protocol.h>
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#include <net/ip_tunnels.h>
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#include <net/arp.h>
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#include <net/checksum.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/rtnetlink.h>
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int iptunnel_xmit(struct net *net, struct rtable *rt,
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struct sk_buff *skb,
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__be32 src, __be32 dst, __u8 proto,
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__u8 tos, __u8 ttl, __be16 df)
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{
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int pkt_len = skb->len;
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struct iphdr *iph;
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int err;
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nf_reset(skb);
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secpath_reset(skb);
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skb->rxhash = 0;
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skb_dst_drop(skb);
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skb_dst_set(skb, &rt->dst);
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memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
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/* Push down and install the IP header. */
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__skb_push(skb, sizeof(struct iphdr));
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skb_reset_network_header(skb);
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iph = ip_hdr(skb);
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iph->version = 4;
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iph->ihl = sizeof(struct iphdr) >> 2;
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iph->frag_off = df;
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iph->protocol = proto;
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iph->tos = tos;
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iph->daddr = dst;
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iph->saddr = src;
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iph->ttl = ttl;
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tunnel_ip_select_ident(skb,
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(const struct iphdr *)skb_inner_network_header(skb),
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&rt->dst);
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err = ip_local_out(skb);
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if (unlikely(net_xmit_eval(err)))
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pkt_len = 0;
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return pkt_len;
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}
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EXPORT_SYMBOL_GPL(iptunnel_xmit);
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