mirror of https://gitee.com/openkylin/linux.git
504 lines
15 KiB
C
504 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _NDISC_H
|
|
#define _NDISC_H
|
|
|
|
#include <net/ipv6_stubs.h>
|
|
|
|
/*
|
|
* ICMP codes for neighbour discovery messages
|
|
*/
|
|
|
|
#define NDISC_ROUTER_SOLICITATION 133
|
|
#define NDISC_ROUTER_ADVERTISEMENT 134
|
|
#define NDISC_NEIGHBOUR_SOLICITATION 135
|
|
#define NDISC_NEIGHBOUR_ADVERTISEMENT 136
|
|
#define NDISC_REDIRECT 137
|
|
|
|
/*
|
|
* Router type: cross-layer information from link-layer to
|
|
* IPv6 layer reported by certain link types (e.g., RFC4214).
|
|
*/
|
|
#define NDISC_NODETYPE_UNSPEC 0 /* unspecified (default) */
|
|
#define NDISC_NODETYPE_HOST 1 /* host or unauthorized router */
|
|
#define NDISC_NODETYPE_NODEFAULT 2 /* non-default router */
|
|
#define NDISC_NODETYPE_DEFAULT 3 /* default router */
|
|
|
|
/*
|
|
* ndisc options
|
|
*/
|
|
|
|
enum {
|
|
__ND_OPT_PREFIX_INFO_END = 0,
|
|
ND_OPT_SOURCE_LL_ADDR = 1, /* RFC2461 */
|
|
ND_OPT_TARGET_LL_ADDR = 2, /* RFC2461 */
|
|
ND_OPT_PREFIX_INFO = 3, /* RFC2461 */
|
|
ND_OPT_REDIRECT_HDR = 4, /* RFC2461 */
|
|
ND_OPT_MTU = 5, /* RFC2461 */
|
|
ND_OPT_NONCE = 14, /* RFC7527 */
|
|
__ND_OPT_ARRAY_MAX,
|
|
ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
|
|
ND_OPT_RDNSS = 25, /* RFC5006 */
|
|
ND_OPT_DNSSL = 31, /* RFC6106 */
|
|
ND_OPT_6CO = 34, /* RFC6775 */
|
|
__ND_OPT_MAX
|
|
};
|
|
|
|
#define MAX_RTR_SOLICITATION_DELAY HZ
|
|
|
|
#define ND_REACHABLE_TIME (30*HZ)
|
|
#define ND_RETRANS_TIMER HZ
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/icmpv6.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/types.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/hash.h>
|
|
|
|
#include <net/neighbour.h>
|
|
|
|
/* Set to 3 to get tracing... */
|
|
#define ND_DEBUG 1
|
|
|
|
#define ND_PRINTK(val, level, fmt, ...) \
|
|
do { \
|
|
if (val <= ND_DEBUG) \
|
|
net_##level##_ratelimited(fmt, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
struct ctl_table;
|
|
struct inet6_dev;
|
|
struct net_device;
|
|
struct net_proto_family;
|
|
struct sk_buff;
|
|
struct prefix_info;
|
|
|
|
extern struct neigh_table nd_tbl;
|
|
|
|
struct nd_msg {
|
|
struct icmp6hdr icmph;
|
|
struct in6_addr target;
|
|
__u8 opt[0];
|
|
};
|
|
|
|
struct rs_msg {
|
|
struct icmp6hdr icmph;
|
|
__u8 opt[0];
|
|
};
|
|
|
|
struct ra_msg {
|
|
struct icmp6hdr icmph;
|
|
__be32 reachable_time;
|
|
__be32 retrans_timer;
|
|
};
|
|
|
|
struct rd_msg {
|
|
struct icmp6hdr icmph;
|
|
struct in6_addr target;
|
|
struct in6_addr dest;
|
|
__u8 opt[0];
|
|
};
|
|
|
|
struct nd_opt_hdr {
|
|
__u8 nd_opt_type;
|
|
__u8 nd_opt_len;
|
|
} __packed;
|
|
|
|
/* ND options */
|
|
struct ndisc_options {
|
|
struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
|
|
#ifdef CONFIG_IPV6_ROUTE_INFO
|
|
struct nd_opt_hdr *nd_opts_ri;
|
|
struct nd_opt_hdr *nd_opts_ri_end;
|
|
#endif
|
|
struct nd_opt_hdr *nd_useropts;
|
|
struct nd_opt_hdr *nd_useropts_end;
|
|
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
|
|
struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1];
|
|
#endif
|
|
};
|
|
|
|
#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
|
|
#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
|
|
#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
|
|
#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
|
|
#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
|
|
#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
|
|
#define nd_opts_nonce nd_opt_array[ND_OPT_NONCE]
|
|
#define nd_802154_opts_src_lladdr nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR]
|
|
#define nd_802154_opts_tgt_lladdr nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR]
|
|
|
|
#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
|
|
|
|
struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
|
|
u8 *opt, int opt_len,
|
|
struct ndisc_options *ndopts);
|
|
|
|
void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
|
|
int data_len, int pad);
|
|
|
|
#define NDISC_OPS_REDIRECT_DATA_SPACE 2
|
|
|
|
/*
|
|
* This structure defines the hooks for IPv6 neighbour discovery.
|
|
* The following hooks can be defined; unless noted otherwise, they are
|
|
* optional and can be filled with a null pointer.
|
|
*
|
|
* int (*is_useropt)(u8 nd_opt_type):
|
|
* This function is called when IPv6 decide RA userspace options. if
|
|
* this function returns 1 then the option given by nd_opt_type will
|
|
* be handled as userspace option additional to the IPv6 options.
|
|
*
|
|
* int (*parse_options)(const struct net_device *dev,
|
|
* struct nd_opt_hdr *nd_opt,
|
|
* struct ndisc_options *ndopts):
|
|
* This function is called while parsing ndisc ops and put each position
|
|
* as pointer into ndopts. If this function return unequal 0, then this
|
|
* function took care about the ndisc option, if 0 then the IPv6 ndisc
|
|
* option parser will take care about that option.
|
|
*
|
|
* void (*update)(const struct net_device *dev, struct neighbour *n,
|
|
* u32 flags, u8 icmp6_type,
|
|
* const struct ndisc_options *ndopts):
|
|
* This function is called when IPv6 ndisc updates the neighbour cache
|
|
* entry. Additional options which can be updated may be previously
|
|
* parsed by parse_opts callback and accessible over ndopts parameter.
|
|
*
|
|
* int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
|
|
* struct neighbour *neigh, u8 *ha_buf,
|
|
* u8 **ha):
|
|
* This function is called when the necessary option space will be
|
|
* calculated before allocating a skb. The parameters neigh, ha_buf
|
|
* abd ha are available on NDISC_REDIRECT messages only.
|
|
*
|
|
* void (*fill_addr_option)(const struct net_device *dev,
|
|
* struct sk_buff *skb, u8 icmp6_type,
|
|
* const u8 *ha):
|
|
* This function is called when the skb will finally fill the option
|
|
* fields inside skb. NOTE: this callback should fill the option
|
|
* fields to the skb which are previously indicated by opt_space
|
|
* parameter. That means the decision to add such option should
|
|
* not lost between these two callbacks, e.g. protected by interface
|
|
* up state.
|
|
*
|
|
* void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
|
|
* const struct prefix_info *pinfo,
|
|
* struct inet6_dev *in6_dev,
|
|
* struct in6_addr *addr,
|
|
* int addr_type, u32 addr_flags,
|
|
* bool sllao, bool tokenized,
|
|
* __u32 valid_lft, u32 prefered_lft,
|
|
* bool dev_addr_generated):
|
|
* This function is called when a RA messages is received with valid
|
|
* PIO option fields and an IPv6 address will be added to the interface
|
|
* for autoconfiguration. The parameter dev_addr_generated reports about
|
|
* if the address was based on dev->dev_addr or not. This can be used
|
|
* to add a second address if link-layer operates with two link layer
|
|
* addresses. E.g. 802.15.4 6LoWPAN.
|
|
*/
|
|
struct ndisc_ops {
|
|
int (*is_useropt)(u8 nd_opt_type);
|
|
int (*parse_options)(const struct net_device *dev,
|
|
struct nd_opt_hdr *nd_opt,
|
|
struct ndisc_options *ndopts);
|
|
void (*update)(const struct net_device *dev, struct neighbour *n,
|
|
u32 flags, u8 icmp6_type,
|
|
const struct ndisc_options *ndopts);
|
|
int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
|
|
struct neighbour *neigh, u8 *ha_buf,
|
|
u8 **ha);
|
|
void (*fill_addr_option)(const struct net_device *dev,
|
|
struct sk_buff *skb, u8 icmp6_type,
|
|
const u8 *ha);
|
|
void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
|
|
const struct prefix_info *pinfo,
|
|
struct inet6_dev *in6_dev,
|
|
struct in6_addr *addr,
|
|
int addr_type, u32 addr_flags,
|
|
bool sllao, bool tokenized,
|
|
__u32 valid_lft, u32 prefered_lft,
|
|
bool dev_addr_generated);
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static inline int ndisc_ops_is_useropt(const struct net_device *dev,
|
|
u8 nd_opt_type)
|
|
{
|
|
if (dev->ndisc_ops && dev->ndisc_ops->is_useropt)
|
|
return dev->ndisc_ops->is_useropt(nd_opt_type);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int ndisc_ops_parse_options(const struct net_device *dev,
|
|
struct nd_opt_hdr *nd_opt,
|
|
struct ndisc_options *ndopts)
|
|
{
|
|
if (dev->ndisc_ops && dev->ndisc_ops->parse_options)
|
|
return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline void ndisc_ops_update(const struct net_device *dev,
|
|
struct neighbour *n, u32 flags,
|
|
u8 icmp6_type,
|
|
const struct ndisc_options *ndopts)
|
|
{
|
|
if (dev->ndisc_ops && dev->ndisc_ops->update)
|
|
dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);
|
|
}
|
|
|
|
static inline int ndisc_ops_opt_addr_space(const struct net_device *dev,
|
|
u8 icmp6_type)
|
|
{
|
|
if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space &&
|
|
icmp6_type != NDISC_REDIRECT)
|
|
return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL,
|
|
NULL, NULL);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev,
|
|
struct neighbour *neigh,
|
|
u8 *ha_buf, u8 **ha)
|
|
{
|
|
if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space)
|
|
return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT,
|
|
neigh, ha_buf, ha);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline void ndisc_ops_fill_addr_option(const struct net_device *dev,
|
|
struct sk_buff *skb,
|
|
u8 icmp6_type)
|
|
{
|
|
if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option &&
|
|
icmp6_type != NDISC_REDIRECT)
|
|
dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);
|
|
}
|
|
|
|
static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev,
|
|
struct sk_buff *skb,
|
|
const u8 *ha)
|
|
{
|
|
if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option)
|
|
dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);
|
|
}
|
|
|
|
static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net,
|
|
struct net_device *dev,
|
|
const struct prefix_info *pinfo,
|
|
struct inet6_dev *in6_dev,
|
|
struct in6_addr *addr,
|
|
int addr_type, u32 addr_flags,
|
|
bool sllao, bool tokenized,
|
|
__u32 valid_lft,
|
|
u32 prefered_lft,
|
|
bool dev_addr_generated)
|
|
{
|
|
if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr)
|
|
dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
|
|
addr, addr_type,
|
|
addr_flags, sllao,
|
|
tokenized, valid_lft,
|
|
prefered_lft,
|
|
dev_addr_generated);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Return the padding between the option length and the start of the
|
|
* link addr. Currently only IP-over-InfiniBand needs this, although
|
|
* if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
|
|
* also need a pad of 2.
|
|
*/
|
|
static inline int ndisc_addr_option_pad(unsigned short type)
|
|
{
|
|
switch (type) {
|
|
case ARPHRD_INFINIBAND: return 2;
|
|
default: return 0;
|
|
}
|
|
}
|
|
|
|
static inline int __ndisc_opt_addr_space(unsigned char addr_len, int pad)
|
|
{
|
|
return NDISC_OPT_SPACE(addr_len + pad);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type)
|
|
{
|
|
return __ndisc_opt_addr_space(dev->addr_len,
|
|
ndisc_addr_option_pad(dev->type)) +
|
|
ndisc_ops_opt_addr_space(dev, icmp6_type);
|
|
}
|
|
|
|
static inline int ndisc_redirect_opt_addr_space(struct net_device *dev,
|
|
struct neighbour *neigh,
|
|
u8 *ops_data_buf,
|
|
u8 **ops_data)
|
|
{
|
|
return __ndisc_opt_addr_space(dev->addr_len,
|
|
ndisc_addr_option_pad(dev->type)) +
|
|
ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf,
|
|
ops_data);
|
|
}
|
|
#endif
|
|
|
|
static inline u8 *__ndisc_opt_addr_data(struct nd_opt_hdr *p,
|
|
unsigned char addr_len, int prepad)
|
|
{
|
|
u8 *lladdr = (u8 *)(p + 1);
|
|
int lladdrlen = p->nd_opt_len << 3;
|
|
if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad))
|
|
return NULL;
|
|
return lladdr + prepad;
|
|
}
|
|
|
|
static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
|
|
struct net_device *dev)
|
|
{
|
|
return __ndisc_opt_addr_data(p, dev->addr_len,
|
|
ndisc_addr_option_pad(dev->type));
|
|
}
|
|
|
|
static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
|
|
{
|
|
const u32 *p32 = pkey;
|
|
|
|
return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
|
|
(p32[1] * hash_rnd[1]) +
|
|
(p32[2] * hash_rnd[2]) +
|
|
(p32[3] * hash_rnd[3]));
|
|
}
|
|
|
|
static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
|
|
{
|
|
return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
|
|
}
|
|
|
|
static inline
|
|
struct neighbour *__ipv6_neigh_lookup_noref_stub(struct net_device *dev,
|
|
const void *pkey)
|
|
{
|
|
return ___neigh_lookup_noref(ipv6_stub->nd_tbl, neigh_key_eq128,
|
|
ndisc_hashfn, pkey, dev);
|
|
}
|
|
|
|
static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
|
|
{
|
|
struct neighbour *n;
|
|
|
|
rcu_read_lock_bh();
|
|
n = __ipv6_neigh_lookup_noref(dev, pkey);
|
|
if (n && !refcount_inc_not_zero(&n->refcnt))
|
|
n = NULL;
|
|
rcu_read_unlock_bh();
|
|
|
|
return n;
|
|
}
|
|
|
|
static inline void __ipv6_confirm_neigh(struct net_device *dev,
|
|
const void *pkey)
|
|
{
|
|
struct neighbour *n;
|
|
|
|
rcu_read_lock_bh();
|
|
n = __ipv6_neigh_lookup_noref(dev, pkey);
|
|
if (n) {
|
|
unsigned long now = jiffies;
|
|
|
|
/* avoid dirtying neighbour */
|
|
if (n->confirmed != now)
|
|
n->confirmed = now;
|
|
}
|
|
rcu_read_unlock_bh();
|
|
}
|
|
|
|
static inline void __ipv6_confirm_neigh_stub(struct net_device *dev,
|
|
const void *pkey)
|
|
{
|
|
struct neighbour *n;
|
|
|
|
rcu_read_lock_bh();
|
|
n = __ipv6_neigh_lookup_noref_stub(dev, pkey);
|
|
if (n) {
|
|
unsigned long now = jiffies;
|
|
|
|
/* avoid dirtying neighbour */
|
|
if (n->confirmed != now)
|
|
n->confirmed = now;
|
|
}
|
|
rcu_read_unlock_bh();
|
|
}
|
|
|
|
/* uses ipv6_stub and is meant for use outside of IPv6 core */
|
|
static inline struct neighbour *ip_neigh_gw6(struct net_device *dev,
|
|
const void *addr)
|
|
{
|
|
struct neighbour *neigh;
|
|
|
|
neigh = __ipv6_neigh_lookup_noref_stub(dev, addr);
|
|
if (unlikely(!neigh))
|
|
neigh = __neigh_create(ipv6_stub->nd_tbl, addr, dev, false);
|
|
|
|
return neigh;
|
|
}
|
|
|
|
int ndisc_init(void);
|
|
int ndisc_late_init(void);
|
|
|
|
void ndisc_late_cleanup(void);
|
|
void ndisc_cleanup(void);
|
|
|
|
int ndisc_rcv(struct sk_buff *skb);
|
|
|
|
void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
|
|
const struct in6_addr *daddr, const struct in6_addr *saddr,
|
|
u64 nonce);
|
|
|
|
void ndisc_send_rs(struct net_device *dev,
|
|
const struct in6_addr *saddr, const struct in6_addr *daddr);
|
|
void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
|
|
const struct in6_addr *solicited_addr,
|
|
bool router, bool solicited, bool override, bool inc_opt);
|
|
|
|
void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
|
|
|
|
int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev,
|
|
int dir);
|
|
|
|
void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
|
|
const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
|
|
struct ndisc_options *ndopts);
|
|
|
|
/*
|
|
* IGMP
|
|
*/
|
|
int igmp6_init(void);
|
|
int igmp6_late_init(void);
|
|
|
|
void igmp6_cleanup(void);
|
|
void igmp6_late_cleanup(void);
|
|
|
|
int igmp6_event_query(struct sk_buff *skb);
|
|
|
|
int igmp6_event_report(struct sk_buff *skb);
|
|
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos);
|
|
int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen);
|
|
#endif
|
|
|
|
void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
|
|
|
|
#endif
|