1 #ifndef _NDISC_H 2 #define _NDISC_H 3 4 /* 5 * ICMP codes for neighbour discovery messages 6 */ 7 8 #define NDISC_ROUTER_SOLICITATION 133 9 #define NDISC_ROUTER_ADVERTISEMENT 134 10 #define NDISC_NEIGHBOUR_SOLICITATION 135 11 #define NDISC_NEIGHBOUR_ADVERTISEMENT 136 12 #define NDISC_REDIRECT 137 13 14 /* 15 * Router type: cross-layer information from link-layer to 16 * IPv6 layer reported by certain link types (e.g., RFC4214). 17 */ 18 #define NDISC_NODETYPE_UNSPEC 0 /* unspecified (default) */ 19 #define NDISC_NODETYPE_HOST 1 /* host or unauthorized router */ 20 #define NDISC_NODETYPE_NODEFAULT 2 /* non-default router */ 21 #define NDISC_NODETYPE_DEFAULT 3 /* default router */ 22 23 /* 24 * ndisc options 25 */ 26 27 enum { 28 __ND_OPT_PREFIX_INFO_END = 0, 29 ND_OPT_SOURCE_LL_ADDR = 1, /* RFC2461 */ 30 ND_OPT_TARGET_LL_ADDR = 2, /* RFC2461 */ 31 ND_OPT_PREFIX_INFO = 3, /* RFC2461 */ 32 ND_OPT_REDIRECT_HDR = 4, /* RFC2461 */ 33 ND_OPT_MTU = 5, /* RFC2461 */ 34 __ND_OPT_ARRAY_MAX, 35 ND_OPT_ROUTE_INFO = 24, /* RFC4191 */ 36 ND_OPT_RDNSS = 25, /* RFC5006 */ 37 __ND_OPT_MAX 38 }; 39 40 #define MAX_RTR_SOLICITATION_DELAY HZ 41 42 #define ND_REACHABLE_TIME (30*HZ) 43 #define ND_RETRANS_TIMER HZ 44 45 #include <linux/compiler.h> 46 #include <linux/icmpv6.h> 47 #include <linux/in6.h> 48 #include <linux/types.h> 49 50 #include <net/neighbour.h> 51 52 struct ctl_table; 53 struct inet6_dev; 54 struct net_device; 55 struct net_proto_family; 56 struct sk_buff; 57 58 extern struct neigh_table nd_tbl; 59 60 struct nd_msg { 61 struct icmp6hdr icmph; 62 struct in6_addr target; 63 __u8 opt[0]; 64 }; 65 66 struct rs_msg { 67 struct icmp6hdr icmph; 68 __u8 opt[0]; 69 }; 70 71 struct ra_msg { 72 struct icmp6hdr icmph; 73 __be32 reachable_time; 74 __be32 retrans_timer; 75 }; 76 77 struct nd_opt_hdr { 78 __u8 nd_opt_type; 79 __u8 nd_opt_len; 80 } __packed; 81 82 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd) 83 { 84 const u32 *p32 = pkey; 85 86 return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) + 87 (p32[1] * hash_rnd[1]) + 88 (p32[2] * hash_rnd[2]) + 89 (p32[3] * hash_rnd[3])); 90 } 91 92 static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey) 93 { 94 struct neigh_hash_table *nht; 95 const u32 *p32 = pkey; 96 struct neighbour *n; 97 u32 hash_val; 98 99 rcu_read_lock_bh(); 100 nht = rcu_dereference_bh(tbl->nht); 101 hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); 102 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); 103 n != NULL; 104 n = rcu_dereference_bh(n->next)) { 105 u32 *n32 = (u32 *) n->primary_key; 106 if (n->dev == dev && 107 ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) | 108 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) { 109 if (!atomic_inc_not_zero(&n->refcnt)) 110 n = NULL; 111 break; 112 } 113 } 114 rcu_read_unlock_bh(); 115 116 return n; 117 } 118 119 extern int ndisc_init(void); 120 121 extern void ndisc_cleanup(void); 122 123 extern int ndisc_rcv(struct sk_buff *skb); 124 125 extern void ndisc_send_ns(struct net_device *dev, 126 struct neighbour *neigh, 127 const struct in6_addr *solicit, 128 const struct in6_addr *daddr, 129 const struct in6_addr *saddr); 130 131 extern void ndisc_send_rs(struct net_device *dev, 132 const struct in6_addr *saddr, 133 const struct in6_addr *daddr); 134 135 extern void ndisc_send_redirect(struct sk_buff *skb, 136 struct neighbour *neigh, 137 const struct in6_addr *target); 138 139 extern int ndisc_mc_map(const struct in6_addr *addr, char *buf, 140 struct net_device *dev, int dir); 141 142 extern struct sk_buff *ndisc_build_skb(struct net_device *dev, 143 const struct in6_addr *daddr, 144 const struct in6_addr *saddr, 145 struct icmp6hdr *icmp6h, 146 const struct in6_addr *target, 147 int llinfo); 148 149 extern void ndisc_send_skb(struct sk_buff *skb, 150 struct net_device *dev, 151 struct neighbour *neigh, 152 const struct in6_addr *daddr, 153 const struct in6_addr *saddr, 154 struct icmp6hdr *icmp6h); 155 156 157 158 /* 159 * IGMP 160 */ 161 extern int igmp6_init(void); 162 163 extern void igmp6_cleanup(void); 164 165 extern int igmp6_event_query(struct sk_buff *skb); 166 167 extern int igmp6_event_report(struct sk_buff *skb); 168 169 170 #ifdef CONFIG_SYSCTL 171 extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, 172 int write, 173 void __user *buffer, 174 size_t *lenp, 175 loff_t *ppos); 176 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, 177 void __user *oldval, size_t __user *oldlenp, 178 void __user *newval, size_t newlen); 179 #endif 180 181 extern void inet6_ifinfo_notify(int event, 182 struct inet6_dev *idev); 183 184 #endif 185