5 * ICMP codes for neighbour discovery messages
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
15 * Router type: cross-layer information from link-layer to
16 * IPv6 layer reported by certain link types (e.g., RFC4214).
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 */
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 */
35 ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
36 ND_OPT_RDNSS = 25, /* RFC5006 */
37 ND_OPT_DNSSL = 31, /* RFC6106 */
41 #define MAX_RTR_SOLICITATION_DELAY HZ
43 #define ND_REACHABLE_TIME (30*HZ)
44 #define ND_RETRANS_TIMER HZ
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>
53 #include <net/neighbour.h>
58 struct net_proto_family;
61 extern struct neigh_table nd_tbl;
64 struct icmp6hdr icmph;
65 struct in6_addr target;
70 struct icmp6hdr icmph;
75 struct icmp6hdr icmph;
76 __be32 reachable_time;
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;
92 struct nd_opt_hdr *nd_useropts;
93 struct nd_opt_hdr *nd_useropts_end;
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]
103 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
105 extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
106 struct ndisc_options *ndopts);
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.
114 static int ndisc_addr_option_pad(unsigned short type)
117 case ARPHRD_INFINIBAND: return 2;
122 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
123 struct net_device *dev)
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))
130 return lladdr + prepad;
133 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
135 const u32 *p32 = pkey;
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]));
143 static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
145 struct neigh_hash_table *nht;
146 const u32 *p32 = pkey;
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]);
155 n = rcu_dereference_bh(n->next)) {
156 u32 *n32 = (u32 *) n->primary_key;
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))
165 rcu_read_unlock_bh();
170 extern int ndisc_init(void);
172 extern void ndisc_cleanup(void);
174 extern int ndisc_rcv(struct sk_buff *skb);
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);
182 extern void ndisc_send_rs(struct net_device *dev,
183 const struct in6_addr *saddr,
184 const struct in6_addr *daddr);
186 extern void ndisc_send_redirect(struct sk_buff *skb,
187 const struct in6_addr *target);
189 extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
190 struct net_device *dev, int dir);
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,
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);
211 extern int igmp6_init(void);
213 extern void igmp6_cleanup(void);
215 extern int igmp6_event_query(struct sk_buff *skb);
217 extern int igmp6_event_report(struct sk_buff *skb);
221 extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
226 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
227 void __user *oldval, size_t __user *oldlenp,
228 void __user *newval, size_t newlen);
231 extern void inet6_ifinfo_notify(int event,
232 struct inet6_dev *idev);