linux/net/ipv6/addrlabel.c

// SPDX-License-Identifier: GPL-2.0
/*
 * IPv6 Address Label subsystem
 * for the IPv6 "Default" Source Address Selection
 *
 * Copyright (C)2007 USAGI/WIDE Project
 */
/*
 * Author:
 *	YOSHIFUJI Hideaki @ USAGI/WIDE Project <[email protected]>
 */

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/in6.h>
#include <linux/slab.h>
#include <net/addrconf.h>
#include <linux/if_addrlabel.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>

#if 0
#define ADDRLABEL …
#else
#define ADDRLABEL(x...) …
#endif

/*
 * Policy Table
 */
struct ip6addrlbl_entry { … };

/*
 * Default policy table (RFC6724 + extensions)
 *
 * prefix		addr_type	label
 * -------------------------------------------------------------------------
 * ::1/128		LOOPBACK	0
 * ::/0			N/A		1
 * 2002::/16		N/A		2
 * ::/96		COMPATv4	3
 * ::ffff:0:0/96	V4MAPPED	4
 * fc00::/7		N/A		5		ULA (RFC 4193)
 * 2001::/32		N/A		6		Teredo (RFC 4380)
 * 2001:10::/28		N/A		7		ORCHID (RFC 4843)
 * fec0::/10		N/A		11		Site-local
 *							(deprecated by RFC3879)
 * 3ffe::/16		N/A		12		6bone
 *
 * Note: 0xffffffff is used if we do not have any policies.
 * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
 */

#define IPV6_ADDR_LABEL_DEFAULT …

static const __net_initconst struct ip6addrlbl_init_table
{ … } ip6addrlbl_init_table[] = …;

/* Find label */
static bool __ip6addrlbl_match(const struct ip6addrlbl_entry *p,
			       const struct in6_addr *addr,
			       int addrtype, int ifindex)
{ … }

static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
						  const struct in6_addr *addr,
						  int type, int ifindex)
{ … }

u32 ipv6_addr_label(struct net *net,
		    const struct in6_addr *addr, int type, int ifindex)
{ … }

/* allocate one entry */
static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix,
						 int prefixlen, int ifindex,
						 u32 label)
{ … }

/* add a label */
static int __ip6addrlbl_add(struct net *net, struct ip6addrlbl_entry *newp,
			    int replace)
{ … }

/* add a label */
static int ip6addrlbl_add(struct net *net,
			  const struct in6_addr *prefix, int prefixlen,
			  int ifindex, u32 label, int replace)
{ … }

/* remove a label */
static int __ip6addrlbl_del(struct net *net,
			    const struct in6_addr *prefix, int prefixlen,
			    int ifindex)
{ … }

static int ip6addrlbl_del(struct net *net,
			  const struct in6_addr *prefix, int prefixlen,
			  int ifindex)
{ … }

/* add default label */
static int __net_init ip6addrlbl_net_init(struct net *net)
{ … }

static void __net_exit ip6addrlbl_net_exit(struct net *net)
{ … }

static struct pernet_operations ipv6_addr_label_ops = …;

int __init ipv6_addr_label_init(void)
{ … }

void ipv6_addr_label_cleanup(void)
{ … }

static const struct nla_policy ifal_policy[IFAL_MAX+1] = …;

static bool addrlbl_ifindex_exists(struct net *net, int ifindex)
{ … }

static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
			     struct netlink_ext_ack *extack)
{ … }

static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
			      int prefixlen, int ifindex, u32 lseq)
{
	struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
	ifal->ifal_family = AF_INET6;
	ifal->__ifal_reserved = 0;
	ifal->ifal_prefixlen = prefixlen;
	ifal->ifal_flags = 0;
	ifal->ifal_index = ifindex;
	ifal->ifal_seq = lseq;
};

static int ip6addrlbl_fill(struct sk_buff *skb,
			   const struct ip6addrlbl_entry *p,
			   u32 lseq,
			   u32 portid, u32 seq, int event,
			   unsigned int flags)
{ … }

static int ip6addrlbl_valid_dump_req(const struct nlmsghdr *nlh,
				     struct netlink_ext_ack *extack)
{ … }

static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
{ … }

static inline int ip6addrlbl_msgsize(void)
{ … }

static int ip6addrlbl_valid_get_req(struct sk_buff *skb,
				    const struct nlmsghdr *nlh,
				    struct nlattr **tb,
				    struct netlink_ext_ack *extack)
{ … }

static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
			  struct netlink_ext_ack *extack)
{ … }

int __init ipv6_addr_label_rtnl_register(void)
{ … }