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 #include <linux/hash.h> 53 54 #include <net/neighbour.h> 55 56 struct ctl_table; 57 struct inet6_dev; 58 struct net_device; 59 struct net_proto_family; 60 struct sk_buff; 61 62 extern struct neigh_table nd_tbl; 63 64 struct nd_msg { 65 struct icmp6hdr icmph; 66 struct in6_addr target; 67 __u8 opt[0]; 68 }; 69 70 struct rs_msg { 71 struct icmp6hdr icmph; 72 __u8 opt[0]; 73 }; 74 75 struct ra_msg { 76 struct icmp6hdr icmph; 77 __be32 reachable_time; 78 __be32 retrans_timer; 79 }; 80 81 struct nd_opt_hdr { 82 __u8 nd_opt_type; 83 __u8 nd_opt_len; 84 } __packed; 85 86 /* ND options */ 87 struct ndisc_options { 88 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; 89 #ifdef CONFIG_IPV6_ROUTE_INFO 90 struct nd_opt_hdr *nd_opts_ri; 91 struct nd_opt_hdr *nd_opts_ri_end; 92 #endif 93 struct nd_opt_hdr *nd_useropts; 94 struct nd_opt_hdr *nd_useropts_end; 95 }; 96 97 #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] 98 #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] 99 #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] 100 #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] 101 #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] 102 #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] 103 104 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) 105 106 extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, 107 struct ndisc_options *ndopts); 108 109 /* 110 * Return the padding between the option length and the start of the 111 * link addr. Currently only IP-over-InfiniBand needs this, although 112 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may 113 * also need a pad of 2. 114 */ 115 static int ndisc_addr_option_pad(unsigned short type) 116 { 117 switch (type) { 118 case ARPHRD_INFINIBAND: return 2; 119 default: return 0; 120 } 121 } 122 123 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, 124 struct net_device *dev) 125 { 126 u8 *lladdr = (u8 *)(p + 1); 127 int lladdrlen = p->nd_opt_len << 3; 128 int prepad = ndisc_addr_option_pad(dev->type); 129 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) 130 return NULL; 131 return lladdr + prepad; 132 } 133 134 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd) 135 { 136 const u32 *p32 = pkey; 137 138 return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) + 139 (p32[1] * hash_rnd[1]) + 140 (p32[2] * hash_rnd[2]) + 141 (p32[3] * hash_rnd[3])); 142 } 143 144 static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey) 145 { 146 struct neigh_hash_table *nht; 147 const u32 *p32 = pkey; 148 struct neighbour *n; 149 u32 hash_val; 150 151 rcu_read_lock_bh(); 152 nht = rcu_dereference_bh(tbl->nht); 153 hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); 154 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); 155 n != NULL; 156 n = rcu_dereference_bh(n->next)) { 157 u32 *n32 = (u32 *) n->primary_key; 158 if (n->dev == dev && 159 ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) | 160 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) { 161 if (!atomic_inc_not_zero(&n->refcnt)) 162 n = NULL; 163 break; 164 } 165 } 166 rcu_read_unlock_bh(); 167 168 return n; 169 } 170 171 extern int ndisc_init(void); 172 173 extern void ndisc_cleanup(void); 174 175 extern int ndisc_rcv(struct sk_buff *skb); 176 177 extern void ndisc_send_ns(struct net_device *dev, 178 struct neighbour *neigh, 179 const struct in6_addr *solicit, 180 const struct in6_addr *daddr, 181 const struct in6_addr *saddr); 182 183 extern void ndisc_send_rs(struct net_device *dev, 184 const struct in6_addr *saddr, 185 const struct in6_addr *daddr); 186 187 extern void ndisc_send_redirect(struct sk_buff *skb, 188 const struct in6_addr *target); 189 190 extern int ndisc_mc_map(const struct in6_addr *addr, char *buf, 191 struct net_device *dev, int dir); 192 193 extern struct sk_buff *ndisc_build_skb(struct net_device *dev, 194 const struct in6_addr *daddr, 195 const struct in6_addr *saddr, 196 struct icmp6hdr *icmp6h, 197 const struct in6_addr *target, 198 int llinfo); 199 200 extern void ndisc_send_skb(struct sk_buff *skb, 201 struct net_device *dev, 202 struct neighbour *neigh, 203 const struct in6_addr *daddr, 204 const struct in6_addr *saddr, 205 struct icmp6hdr *icmp6h); 206 207 208 209 /* 210 * IGMP 211 */ 212 extern int igmp6_init(void); 213 214 extern void igmp6_cleanup(void); 215 216 extern int igmp6_event_query(struct sk_buff *skb); 217 218 extern int igmp6_event_report(struct sk_buff *skb); 219 220 221 #ifdef CONFIG_SYSCTL 222 extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, 223 int write, 224 void __user *buffer, 225 size_t *lenp, 226 loff_t *ppos); 227 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, 228 void __user *oldval, size_t __user *oldlenp, 229 void __user *newval, size_t newlen); 230 #endif 231 232 extern void inet6_ifinfo_notify(int event, 233 struct inet6_dev *idev); 234 235 #endif 236