linux/net/ipv6/mcast_snoop.c

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2010: YOSHIFUJI Hideaki <[email protected]>
 * Copyright (C) 2015: Linus Lüssing <[email protected]>
 *
 * Based on the MLD support added to br_multicast.c by YOSHIFUJI Hideaki.
 */

#include <linux/skbuff.h>
#include <net/ipv6.h>
#include <net/mld.h>
#include <net/addrconf.h>
#include <net/ip6_checksum.h>

static int ipv6_mc_check_ip6hdr(struct sk_buff *skb)
{ … }

static int ipv6_mc_check_exthdrs(struct sk_buff *skb)
{ … }

static int ipv6_mc_check_mld_reportv2(struct sk_buff *skb)
{ … }

static int ipv6_mc_check_mld_query(struct sk_buff *skb)
{ … }

static int ipv6_mc_check_mld_msg(struct sk_buff *skb)
{ … }

static inline __sum16 ipv6_mc_validate_checksum(struct sk_buff *skb)
{ … }

static int ipv6_mc_check_icmpv6(struct sk_buff *skb)
{ … }

/**
 * ipv6_mc_check_mld - checks whether this is a sane MLD packet
 * @skb: the skb to validate
 *
 * Checks whether an IPv6 packet is a valid MLD packet. If so sets
 * skb transport header accordingly and returns zero.
 *
 * -EINVAL: A broken packet was detected, i.e. it violates some internet
 *  standard
 * -ENOMSG: IP header validation succeeded but it is not an ICMPv6 packet
 *  with a hop-by-hop option.
 * -ENODATA: IP+ICMPv6 header with hop-by-hop option validation succeeded
 *  but it is not an MLD packet.
 * -ENOMEM: A memory allocation failure happened.
 *
 * Caller needs to set the skb network header and free any returned skb if it
 * differs from the provided skb.
 */
int ipv6_mc_check_mld(struct sk_buff *skb)
{ … }
EXPORT_SYMBOL(…);