Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | /* |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 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 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 34 | __ND_OPT_ARRAY_MAX, |
| 35 | ND_OPT_ROUTE_INFO = 24, /* RFC4191 */ |
Pierre Ynard | 3191057 | 2007-10-10 21:22:05 -0700 | [diff] [blame] | 36 | ND_OPT_RDNSS = 25, /* RFC5006 */ |
Alexey I. Froloff | e35f30c | 2012-04-06 05:50:58 +0000 | [diff] [blame] | 37 | ND_OPT_DNSSL = 31, /* RFC6106 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 46 | #include <linux/compiler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/icmpv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 48 | #include <linux/in6.h> |
| 49 | #include <linux/types.h> |
David S. Miller | 30f2a5f | 2012-07-11 23:26:46 -0700 | [diff] [blame] | 50 | #include <linux/if_arp.h> |
| 51 | #include <linux/netdevice.h> |
Pavel Emelyanov | b14f243 | 2012-08-08 21:52:28 +0000 | [diff] [blame] | 52 | #include <linux/hash.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <net/neighbour.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 55 | |
| 56 | struct ctl_table; |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 57 | struct inet6_dev; |
| 58 | struct net_device; |
| 59 | struct net_proto_family; |
| 60 | struct sk_buff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 77 | __be32 reachable_time; |
| 78 | __be32 retrans_timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | }; |
| 80 | |
Duan Jiong | 093d04d | 2012-12-14 02:59:59 +0000 | [diff] [blame] | 81 | struct rd_msg { |
| 82 | struct icmp6hdr icmph; |
| 83 | struct in6_addr target; |
| 84 | struct in6_addr dest; |
| 85 | __u8 opt[0]; |
| 86 | }; |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | struct nd_opt_hdr { |
| 89 | __u8 nd_opt_type; |
| 90 | __u8 nd_opt_len; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 91 | } __packed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
David S. Miller | 30f2a5f | 2012-07-11 23:26:46 -0700 | [diff] [blame] | 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 | extern 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 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 u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, |
| 131 | struct net_device *dev) |
| 132 | { |
| 133 | u8 *lladdr = (u8 *)(p + 1); |
| 134 | int lladdrlen = p->nd_opt_len << 3; |
| 135 | int prepad = ndisc_addr_option_pad(dev->type); |
| 136 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) |
| 137 | return NULL; |
| 138 | return lladdr + prepad; |
| 139 | } |
| 140 | |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 141 | static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd) |
| 142 | { |
| 143 | const u32 *p32 = pkey; |
| 144 | |
Pavel Emelyanov | b14f243 | 2012-08-08 21:52:28 +0000 | [diff] [blame] | 145 | return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) + |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 146 | (p32[1] * hash_rnd[1]) + |
| 147 | (p32[2] * hash_rnd[2]) + |
| 148 | (p32[3] * hash_rnd[3])); |
| 149 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
David S. Miller | f83c779 | 2011-12-28 15:41:23 -0500 | [diff] [blame] | 151 | static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey) |
| 152 | { |
| 153 | struct neigh_hash_table *nht; |
| 154 | const u32 *p32 = pkey; |
| 155 | struct neighbour *n; |
| 156 | u32 hash_val; |
| 157 | |
| 158 | rcu_read_lock_bh(); |
| 159 | nht = rcu_dereference_bh(tbl->nht); |
| 160 | hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
| 161 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); |
| 162 | n != NULL; |
| 163 | n = rcu_dereference_bh(n->next)) { |
| 164 | u32 *n32 = (u32 *) n->primary_key; |
| 165 | if (n->dev == dev && |
| 166 | ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) | |
| 167 | (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) { |
| 168 | if (!atomic_inc_not_zero(&n->refcnt)) |
| 169 | n = NULL; |
| 170 | break; |
| 171 | } |
| 172 | } |
| 173 | rcu_read_unlock_bh(); |
| 174 | |
| 175 | return n; |
| 176 | } |
| 177 | |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 178 | extern int ndisc_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | extern void ndisc_cleanup(void); |
| 181 | |
| 182 | extern int ndisc_rcv(struct sk_buff *skb); |
| 183 | |
| 184 | extern void ndisc_send_ns(struct net_device *dev, |
| 185 | struct neighbour *neigh, |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 186 | const struct in6_addr *solicit, |
| 187 | const struct in6_addr *daddr, |
| 188 | const struct in6_addr *saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | extern void ndisc_send_rs(struct net_device *dev, |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 191 | const struct in6_addr *saddr, |
| 192 | const struct in6_addr *daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | extern void ndisc_send_redirect(struct sk_buff *skb, |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 195 | const struct in6_addr *target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 197 | extern int ndisc_mc_map(const struct in6_addr *addr, char *buf, |
| 198 | struct net_device *dev, int dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
| 201 | /* |
| 202 | * IGMP |
| 203 | */ |
Denis V. Lunev | 9b0f976 | 2008-02-29 11:13:15 -0800 | [diff] [blame] | 204 | extern int igmp6_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | extern void igmp6_cleanup(void); |
| 207 | |
| 208 | extern int igmp6_event_query(struct sk_buff *skb); |
| 209 | |
| 210 | extern int igmp6_event_report(struct sk_buff *skb); |
| 211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | #ifdef CONFIG_SYSCTL |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 214 | extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | int write, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | void __user *buffer, |
| 217 | size_t *lenp, |
| 218 | loff_t *ppos); |
Alexey Dobriyan | f221e72 | 2008-10-15 22:04:23 -0700 | [diff] [blame] | 219 | int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, |
| 220 | void __user *oldval, size_t __user *oldlenp, |
YOSHIFUJI Hideaki | 0686caa | 2008-05-19 16:25:42 -0700 | [diff] [blame] | 221 | void __user *newval, size_t newlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | #endif |
| 223 | |
| 224 | extern void inet6_ifinfo_notify(int event, |
| 225 | struct inet6_dev *idev); |
| 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | #endif |