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ndisc.h
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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
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