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 rd_msg { 82 struct icmp6hdr icmph; 83 struct in6_addr target; 84 struct in6_addr dest; 85 __u8 opt[0]; 86 }; 87 88 struct nd_opt_hdr { 89 __u8 nd_opt_type; 90 __u8 nd_opt_len; 91 } __packed; 92 93 /* ND options */ 94 struct ndisc_options { 95 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; 96 #ifdef CONFIG_IPV6_ROUTE_INFO 97 struct nd_opt_hdr *nd_opts_ri; 98 struct nd_opt_hdr *nd_opts_ri_end; 99 #endif 100 struct nd_opt_hdr *nd_useropts; 101 struct nd_opt_hdr *nd_useropts_end; 102 }; 103 104 #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] 105 #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] 106 #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] 107 #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] 108 #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] 109 #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] 110 111 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) 112 113 struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, 114 struct ndisc_options *ndopts); 115 116 /* 117 * Return the padding between the option length and the start of the 118 * link addr. Currently only IP-over-InfiniBand needs this, although 119 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may 120 * also need a pad of 2. 121 */ 122 static inline int ndisc_addr_option_pad(unsigned short type) 123 { 124 switch (type) { 125 case ARPHRD_INFINIBAND: return 2; 126 default: return 0; 127 } 128 } 129 130 static inline int ndisc_opt_addr_space(struct net_device *dev) 131 { 132 return NDISC_OPT_SPACE(dev->addr_len + 133 ndisc_addr_option_pad(dev->type)); 134 } 135 136 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, 137 struct net_device *dev) 138 { 139 u8 *lladdr = (u8 *)(p + 1); 140 int lladdrlen = p->nd_opt_len << 3; 141 int prepad = ndisc_addr_option_pad(dev->type); 142 if (lladdrlen != ndisc_opt_addr_space(dev)) 143 return NULL; 144 return lladdr + prepad; 145 } 146 147 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd) 148 { 149 const u32 *p32 = pkey; 150 151 return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) + 152 (p32[1] * hash_rnd[1]) + 153 (p32[2] * hash_rnd[2]) + 154 (p32[3] * hash_rnd[3])); 155 } 156 157 static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey) 158 { 159 return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev); 160 } 161 162 static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey) 163 { 164 struct neighbour *n; 165 166 rcu_read_lock_bh(); 167 n = __ipv6_neigh_lookup_noref(dev, pkey); 168 if (n && !atomic_inc_not_zero(&n->refcnt)) 169 n = NULL; 170 rcu_read_unlock_bh(); 171 172 return n; 173 } 174 175 int ndisc_init(void); 176 int ndisc_late_init(void); 177 178 void ndisc_late_cleanup(void); 179 void ndisc_cleanup(void); 180 181 int ndisc_rcv(struct sk_buff *skb); 182 183 void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, 184 const struct in6_addr *solicit, 185 const struct in6_addr *daddr, const struct in6_addr *saddr); 186 187 void ndisc_send_rs(struct net_device *dev, 188 const struct in6_addr *saddr, const struct in6_addr *daddr); 189 void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, 190 const struct in6_addr *daddr, 191 const struct in6_addr *solicited_addr, 192 bool router, bool solicited, bool override, bool inc_opt); 193 194 void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target); 195 196 int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, 197 int dir); 198 199 200 /* 201 * IGMP 202 */ 203 int igmp6_init(void); 204 205 void igmp6_cleanup(void); 206 207 int igmp6_event_query(struct sk_buff *skb); 208 209 int igmp6_event_report(struct sk_buff *skb); 210 211 212 #ifdef CONFIG_SYSCTL 213 int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, 214 void __user *buffer, size_t *lenp, loff_t *ppos); 215 int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl, 216 void __user *oldval, size_t __user *oldlenp, 217 void __user *newval, size_t newlen); 218 #endif 219 220 void inet6_ifinfo_notify(int event, struct inet6_dev *idev); 221 222 #endif 223