linux-imx

/*

 *  IPv6 output functions

 *  Linux INET6 implementation

 *

 *  Authors:

 *  Pedro Roque     <roque@di.fc.ul.pt>

 *

 *  Based on linux/net/ipv4/ip_output.c

 *

 *  This program is free software; you can redistribute it and/or

 *      modify it under the terms of the GNU General Public License

 *      as published by the Free Software Foundation; either version

 *      2 of the License, or (at your option) any later version.

 *

 *  Changes:

 *  A.N.Kuznetsov   :   airthmetics in fragmentation.

 *              extension headers are implemented.

 *              route changes now work.

 *              ip6_forward does not confuse sniffers.

 *              etc.

 *

 *      H. von Brand    :       Added missing #include <linux/string.h>

 *  Imran Patel :   frag id should be in NBO

 *      Kazunori MIYAZAWA @USAGI

 *          :       add ip6_append_data and related functions

 *              for datagram xmit

 */

​

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/socket.h>

#include <linux/net.h>

#include <linux/netdevice.h>

#include <linux/if_arp.h>

#include <linux/in6.h>

#include <linux/tcp.h>

#include <linux/route.h>

#include <linux/module.h>

#include <linux/slab.h>

​

#include <linux/bpf-cgroup.h>

#include <linux/netfilter.h>

#include <linux/netfilter_ipv6.h>

​

#include <net/sock.h>

#include <net/snmp.h>

​

#include <net/ipv6.h>

#include <net/ndisc.h>

#include <net/protocol.h>

#include <net/ip6_route.h>

#include <net/addrconf.h>

#include <net/rawv6.h>

#include <net/icmp.h>

#include <net/xfrm.h>

#include <net/checksum.h>

#include <linux/mroute6.h>

#include <net/l3mdev.h>

#include <net/lwtunnel.h>

​

static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)

{

    struct dst_entry *dst = skb_dst(skb);

    struct net_device *dev = dst->dev;

    struct neighbour *neigh;

    struct in6_addr *nexthop;

    int ret;

​

    if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {

        struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));

​

        if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&

            ((mroute6_is_socket(net, skb) &&

             !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||

             ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,

                     &ipv6_hdr(skb)->saddr))) {

            struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);

​

            /* Do not check for IFF_ALLMULTI; multicast routing

               is not supported in any case.

             */

            if (newskb)

                NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,

                    net, sk, newskb, NULL, newskb->dev,

                    dev_loopback_xmit);

​

            if (ipv6_hdr(skb)->hop_limit == 0) {

                IP6_INC_STATS(net, idev,

                          IPSTATS_MIB_OUTDISCARDS);

                kfree_skb(skb);

                return 0;