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_DNSSL = 31, /* RFC6106 */ 38 __ND_OPT_MAX 39 }; 40 41 #define MAX_RTR_SOLICITATION_DELAY HZ 42 43 #define ND_REACHABLE_TIME (30*HZ) 44 #define ND_RETRANS_TIMER HZ 45 46 #include <linux/compiler.h> 47 #include <linux/icmpv6.h> 48 #include <linux/in6.h> 49 #include <linux/types.h> 50 #include <linux/if_arp.h> 51 #include <linux/netdevice.h> 52 53 #include <net/neighbour.h> 54 55 struct ctl_table; 56 struct inet6_dev; 57 struct net_device; 58 struct net_proto_family; 59 struct sk_buff; 60 61 extern struct neigh_table nd_tbl; 62 63 struct nd_msg { 64 struct icmp6hdr icmph; 65 struct in6_addr target; 66 __u8 opt[0]; 67 }; 68 69 struct rs_msg { 70 struct icmp6hdr icmph; 71 __u8 opt[0]; 72 }; 73 74 struct ra_msg { 75 struct icmp6hdr icmph; 76 __be32 reachable_time; 77 __be32 retrans_timer; 78 }; 79 80 struct nd_opt_hdr { 81 __u8 nd_opt_type; 82 __u8 nd_opt_len; 83 } __packed; 84 85 /* ND options */ 86 struct ndisc_options { 87 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; 88 #ifdef CONFIG_IPV6_ROUTE_INFO 89 struct nd_opt_hdr *nd_opts_ri; 90 struct nd_opt_hdr *nd_opts_ri_end; 91 #endif 92 struct nd_opt_hdr *nd_useropts; 93 struct nd_opt_hdr *nd_useropts_end; 94 }; 95 96 #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] 97 #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] 98 #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] 99 #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] 100 #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] 101 #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] 102 103 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) 104 105 extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, 106 struct ndisc_options *ndopts); 107 108 /* 109 * Return the padding between the option length and the start of the 110 * link addr. Currently only IP-over-InfiniBand needs this, although 111 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may 112 * also need a pad of 2. 113 */ 114 static int ndisc_addr_option_pad(unsigned short type) 115 { 116 switch (type) { 117 case ARPHRD_INFINIBAND: return 2; 118 default: return 0; 119 } 120 } 121 122 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, 123 struct net_device *dev) 124 { 125 u8 *lladdr = (u8 *)(p + 1); 126 int lladdrlen = p->nd_opt_len << 3; 127 int prepad = ndisc_addr_option_pad(dev->type); 128 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) 129 return NULL; 130 return lladdr + prepad; 131 } 132 133 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd) 134 { 135 const u32 *p32 = pkey; 136 137 return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) + 138 (p32[1] * hash_rnd[1]) + 139 (p32[2] * hash_rnd[2]) + 140 (p32[3] * hash_rnd[3])); 141 } 142 143 static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey) 144 { 145 struct neigh_hash_table *nht; 146 const u32 *p32 = pkey; 147 struct neighbour *n; 148 u32 hash_val; 149 150 rcu_read_lock_bh(); 151 nht = rcu_dereference_bh(tbl->nht); 152 hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); 153 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); 154 n != NULL; 155 n = rcu_dereference_bh(n->next)) { 156 u32 *n32 = (u32 *) n->primary_key; 157 if (n->dev == dev && 158 ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) | 159 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) { 160 if (!atomic_inc_not_zero(&n->refcnt)) 161 n = NULL; 162 break; 163 } 164 } 165 rcu_read_unlock_bh(); 166 167 return n; 168 } 169 170 extern int ndisc_init(void); 171 172 extern void ndisc_cleanup(void); 173 174 extern int ndisc_rcv(struct sk_buff *skb); 175 176 extern void ndisc_send_ns(struct net_device *dev, 177 struct neighbour *neigh, 178 const struct in6_addr *solicit, 179 const struct in6_addr *daddr, 180 const struct in6_addr *saddr); 181 182 extern void ndisc_send_rs(struct net_device *dev, 183 const struct in6_addr *saddr, 184 const struct in6_addr *daddr); 185 186 extern void ndisc_send_redirect(struct sk_buff *skb, 187 const struct in6_addr *target); 188 189 extern int ndisc_mc_map(const struct in6_addr *addr, char *buf, 190 struct net_device *dev, int dir); 191 192 extern struct sk_buff *ndisc_build_skb(struct net_device *dev, 193 const struct in6_addr *daddr, 194 const struct in6_addr *saddr, 195 struct icmp6hdr *icmp6h, 196 const struct in6_addr *target, 197 int llinfo); 198 199 extern void ndisc_send_skb(struct sk_buff *skb, 200 struct net_device *dev, 201 struct neighbour *neigh, 202 const struct in6_addr *daddr, 203 const struct in6_addr *saddr, 204 struct icmp6hdr *icmp6h); 205 206 207 208 /* 209 * IGMP 210 */ 211 extern int igmp6_init(void); 212 213 extern void igmp6_cleanup(void); 214 215 extern int igmp6_event_query(struct sk_buff *skb); 216 217 extern int igmp6_event_report(struct sk_buff *skb); 218 219 220 #ifdef CONFIG_SYSCTL 221 extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, 222 int write, 223 void __user *buffer, 224 size_t *lenp, 225 loff_t *ppos); 226 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, 227 void __user *oldval, size_t __user *oldlenp, 228 void __user *newval, size_t newlen); 229 #endif 230 231 extern void inet6_ifinfo_notify(int event, 232 struct inet6_dev *idev); 233 234 #endif 235