4991969a10
Instead, compute it as-needed inside of that function using dst_neigh_lookup(). Signed-off-by: David S. Miller <davem@davemloft.net>
183 lines
4.4 KiB
C
183 lines
4.4 KiB
C
#ifndef _NDISC_H
|
|
#define _NDISC_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_ARRAY_MAX,
|
|
ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
|
|
ND_OPT_RDNSS = 25, /* RFC5006 */
|
|
__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 <net/neighbour.h>
|
|
|
|
struct ctl_table;
|
|
struct inet6_dev;
|
|
struct net_device;
|
|
struct net_proto_family;
|
|
struct sk_buff;
|
|
|
|
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 nd_opt_hdr {
|
|
__u8 nd_opt_type;
|
|
__u8 nd_opt_len;
|
|
} __packed;
|
|
|
|
static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
|
|
{
|
|
const u32 *p32 = pkey;
|
|
|
|
return (((p32[0] ^ dev->ifindex) * 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(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
|
|
{
|
|
struct neigh_hash_table *nht;
|
|
const u32 *p32 = pkey;
|
|
struct neighbour *n;
|
|
u32 hash_val;
|
|
|
|
rcu_read_lock_bh();
|
|
nht = rcu_dereference_bh(tbl->nht);
|
|
hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
|
|
for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
|
|
n != NULL;
|
|
n = rcu_dereference_bh(n->next)) {
|
|
u32 *n32 = (u32 *) n->primary_key;
|
|
if (n->dev == dev &&
|
|
((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
|
|
(n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
|
|
if (!atomic_inc_not_zero(&n->refcnt))
|
|
n = NULL;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock_bh();
|
|
|
|
return n;
|
|
}
|
|
|
|
extern int ndisc_init(void);
|
|
|
|
extern void ndisc_cleanup(void);
|
|
|
|
extern int ndisc_rcv(struct sk_buff *skb);
|
|
|
|
extern void ndisc_send_ns(struct net_device *dev,
|
|
struct neighbour *neigh,
|
|
const struct in6_addr *solicit,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr);
|
|
|
|
extern void ndisc_send_rs(struct net_device *dev,
|
|
const struct in6_addr *saddr,
|
|
const struct in6_addr *daddr);
|
|
|
|
extern void ndisc_send_redirect(struct sk_buff *skb,
|
|
const struct in6_addr *target);
|
|
|
|
extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
|
|
struct net_device *dev, int dir);
|
|
|
|
extern struct sk_buff *ndisc_build_skb(struct net_device *dev,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr,
|
|
struct icmp6hdr *icmp6h,
|
|
const struct in6_addr *target,
|
|
int llinfo);
|
|
|
|
extern void ndisc_send_skb(struct sk_buff *skb,
|
|
struct net_device *dev,
|
|
struct neighbour *neigh,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr,
|
|
struct icmp6hdr *icmp6h);
|
|
|
|
|
|
|
|
/*
|
|
* IGMP
|
|
*/
|
|
extern int igmp6_init(void);
|
|
|
|
extern void igmp6_cleanup(void);
|
|
|
|
extern int igmp6_event_query(struct sk_buff *skb);
|
|
|
|
extern int igmp6_event_report(struct sk_buff *skb);
|
|
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
extern 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(ctl_table *ctl,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen);
|
|
#endif
|
|
|
|
extern void inet6_ifinfo_notify(int event,
|
|
struct inet6_dev *idev);
|
|
|
|
#endif
|