diff options
Diffstat (limited to 'include/net/ndisc.h')
| -rw-r--r-- | include/net/ndisc.h | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/include/net/ndisc.h b/include/net/ndisc.h new file mode 100644 index 000000000..b3a775125 --- /dev/null +++ b/include/net/ndisc.h @@ -0,0 +1,222 @@ +#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_DNSSL = 31, /* RFC6106 */ + __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> + +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 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; +}; + +#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 NDISC_OPT_SPACE(len) (((len)+2+7)&~7) + +struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, + struct ndisc_options *ndopts); + +/* + * 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(struct net_device *dev) +{ + return NDISC_OPT_SPACE(dev->addr_len + + ndisc_addr_option_pad(dev->type)); +} + +static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, + struct net_device *dev) +{ + u8 *lladdr = (u8 *)(p + 1); + int lladdrlen = p->nd_opt_len << 3; + int prepad = ndisc_addr_option_pad(dev->type); + if (lladdrlen != ndisc_opt_addr_space(dev)) + return NULL; + return lladdr + prepad; +} + +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(struct net_device *dev, const void *pkey) +{ + struct neighbour *n; + + rcu_read_lock_bh(); + n = __ipv6_neigh_lookup_noref(dev, pkey); + if (n && !atomic_inc_not_zero(&n->refcnt)) + n = NULL; + rcu_read_unlock_bh(); + + return n; +} + +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, struct neighbour *neigh, + const struct in6_addr *solicit, + const struct in6_addr *daddr, const struct in6_addr *saddr); + +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, struct neighbour *neigh, + 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); + + +/* + * IGMP + */ +int igmp6_init(void); + +void igmp6_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 |