1: /*
2: * BIRD -- Router Advertisement
3: *
4: *
5: * Can be freely distributed and used under the terms of the GNU GPL.
6: */
7:
8: #ifndef _BIRD_RADV_H_
9: #define _BIRD_RADV_H_
10:
11: #include "nest/bird.h"
12:
13: #include "lib/ip.h"
14: #include "lib/lists.h"
15: #include "lib/socket.h"
16: #include "lib/timer.h"
17: #include "lib/resource.h"
18: #include "nest/protocol.h"
19: #include "nest/iface.h"
20: #include "nest/route.h"
21: #include "nest/cli.h"
22: #include "nest/locks.h"
23: #include "conf/conf.h"
24: #include "lib/string.h"
25:
26:
27: #define ICMPV6_PROTO 58
28:
29: #define ICMPV6_RS 133
30: #define ICMPV6_RA 134
31:
32: #define MAX_INITIAL_RTR_ADVERTISEMENTS 3
33: #define MAX_INITIAL_RTR_ADVERT_INTERVAL 16
34:
35: #define DEFAULT_MAX_RA_INT 600
36: #define DEFAULT_MIN_DELAY 3
37: #define DEFAULT_CURRENT_HOP_LIMIT 64
38:
39: #define DEFAULT_VALID_LIFETIME 86400
40: #define DEFAULT_PREFERRED_LIFETIME 14400
41:
42: #define DEFAULT_DNS_LIFETIME_MULT 3
43:
44:
45: struct radv_config
46: {
47: struct proto_config c;
48: list patt_list; /* List of iface configs (struct radv_iface_config) */
49: list pref_list; /* Global list of prefix configs (struct radv_prefix_config) */
50: list rdnss_list; /* Global list of RDNSS configs (struct radv_rdnss_config) */
51: list dnssl_list; /* Global list of DNSSL configs (struct radv_dnssl_config) */
52:
53: ip_addr trigger_prefix; /* Prefix of a trigger route, if defined */
54: u8 trigger_pxlen; /* Pxlen of a trigger route, if defined */
55: u8 trigger_valid; /* Whether a trigger route is defined */
56: u8 propagate_routes; /* Do we propagate more specific routes (RFC 4191)? */
57: u32 max_linger_time; /* Maximum of interface route_linger_time */
58: };
59:
60: struct radv_iface_config
61: {
62: struct iface_patt i;
63: list pref_list; /* Local list of prefix configs (struct radv_prefix_config) */
64: list rdnss_list; /* Local list of RDNSS configs (struct radv_rdnss_config) */
65: list dnssl_list; /* Local list of DNSSL configs (struct radv_dnssl_config) */
66:
67: u32 min_ra_int; /* Standard options from RFC 4861 */
68: u32 max_ra_int;
69: u32 min_delay;
70:
71: u32 prefix_linger_time; /* How long we advertise dead prefixes with lifetime 0 */
72: u32 route_linger_time; /* How long we advertise dead routes with lifetime 0 */
73:
74: u8 rdnss_local; /* Global list is not used for RDNSS */
75: u8 dnssl_local; /* Global list is not used for DNSSL */
76:
77: u8 managed; /* Standard options from RFC 4861 */
78: u8 other_config;
79: u32 link_mtu;
80: u32 reachable_time;
81: u32 retrans_timer;
82: u32 current_hop_limit;
83: u32 default_lifetime;
84: u32 route_lifetime; /* Lifetime for the RFC 4191 routes */
85: u8 default_lifetime_sensitive; /* Whether default_lifetime depends on trigger */
86: u8 route_lifetime_sensitive; /* Whether route_lifetime depends on trigger */
87: u8 default_preference; /* Default Router Preference (RFC 4191) */
88: u8 route_preference; /* Specific Route Preference (RFC 4191) */
89: };
90:
91: struct radv_prefix_config
92: {
93: node n;
94: ip_addr prefix;
95: uint pxlen;
96:
97: u8 skip; /* Do not include this prefix to RA */
98: u8 onlink; /* Standard options from RFC 4861 */
99: u8 autonomous;
100: u32 valid_lifetime;
101: u32 preferred_lifetime;
102: u8 valid_lifetime_sensitive; /* Whether valid_lifetime depends on trigger */
103: u8 preferred_lifetime_sensitive; /* Whether preferred_lifetime depends on trigger */
104: };
105:
106: struct radv_rdnss_config
107: {
108: node n;
109: u32 lifetime; /* Valid if lifetime_mult is 0 */
110: u16 lifetime_mult; /* Lifetime specified as multiple of max_ra_int */
111: ip_addr server; /* IP address of recursive DNS server */
112: };
113:
114: struct radv_dnssl_config
115: {
116: node n;
117: u32 lifetime; /* Valid if lifetime_mult is 0 */
118: u16 lifetime_mult; /* Lifetime specified as multiple of max_ra_int */
119: u8 dlen_first; /* Length of first label in domain */
120: u8 dlen_all; /* Both dlen_ filled in radv_process_domain() */
121: char *domain; /* Domain for DNS search list, in processed form */
122: };
123:
124: /*
125: * One more specific route as per RFC 4191.
126: *
127: * Note that it does *not* contain the next hop field. The next hop is always
128: * the router sending the advertisment and the more specific route only allows
129: * overriding the preference of the route.
130: */
131: struct radv_route
132: {
133: struct fib_node n;
134: u32 lifetime; /* Lifetime from an attribute */
135: u8 lifetime_set; /* Whether lifetime is defined */
136: u8 preference; /* Preference of the route, RA_PREF_* */
137: u8 preference_set; /* Whether preference is defined */
138: u8 valid; /* Whethe route is valid or withdrawn */
139: bird_clock_t changed; /* Last time when the route changed */
140: };
141:
142: struct radv_proto
143: {
144: struct proto p;
145: list iface_list; /* List of active ifaces */
146: u8 valid; /* Router is valid for forwarding, used for shutdown */
147: u8 active; /* Whether radv is active w.r.t. triggers */
148: u8 fib_up; /* FIB table (routes) is initialized */
149: struct fib routes; /* FIB table of specific routes (struct radv_route) */
150: bird_clock_t prune_time; /* Next time of route table pruning */
151: };
152:
153: struct radv_prefix /* One prefix we advertise */
154: {
155: node n;
156: ip_addr prefix;
157: u8 len;
158: u8 valid; /* Is the prefix valid? If not, we advertise it
159: with 0 lifetime, so clients stop using it */
160: u8 mark; /* A temporary mark for processing */
161: bird_clock_t changed; /* Last time when the prefix changed */
162: struct radv_prefix_config *cf; /* The config tied to this prefix */
163: };
164:
165: struct radv_iface
166: {
167: node n;
168: struct radv_proto *ra;
169: struct radv_iface_config *cf; /* Related config, must be updated in reconfigure */
170: struct iface *iface;
171: struct ifa *addr; /* Link-local address of iface */
172: struct pool *pool; /* A pool for interface-specific things */
173: list prefixes; /* The prefixes we advertise (struct radv_prefix) */
174: bird_clock_t prune_time; /* Next time of prefix list pruning */
175: bird_clock_t valid_time; /* Cached packet is valid until first linger timeout */
176:
177: timer *timer;
178: struct object_lock *lock;
179: sock *sk;
180:
181: bird_clock_t last; /* Time of last sending of RA */
182: u16 plen; /* Length of prepared RA in tbuf, or 0 if not valid */
183: byte initial; /* How many RAs are still to be sent as initial */
184: };
185:
186: #define RA_EV_INIT 1 /* Switch to initial mode */
187: #define RA_EV_CHANGE 2 /* Change of options or prefixes */
188: #define RA_EV_RS 3 /* Received RS */
189:
190: /* Default Router Preferences (RFC 4191) */
191: #define RA_PREF_LOW 0x18
192: #define RA_PREF_MEDIUM 0x00
193: #define RA_PREF_HIGH 0x08
194: #define RA_PREF_MASK 0x18
195:
196: /* Attributes */
197: #define EA_RA_PREFERENCE EA_CODE(EAP_RADV, 0)
198: #define EA_RA_LIFETIME EA_CODE(EAP_RADV, 1)
199:
200: #ifdef LOCAL_DEBUG
201: #define RADV_FORCE_DEBUG 1
202: #else
203: #define RADV_FORCE_DEBUG 0
204: #endif
205: #define RADV_TRACE(flags, msg, args...) do { if ((p->p.debug & flags) || RADV_FORCE_DEBUG) \
206: log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
207:
208:
209: /* radv.c */
210: void radv_iface_notify(struct radv_iface *ifa, int event);
211:
212: /* packets.c */
213: int radv_process_domain(struct radv_dnssl_config *cf);
214: void radv_send_ra(struct radv_iface *ifa);
215: int radv_sk_open(struct radv_iface *ifa);
216:
217:
218:
219: #endif /* _BIRD_RADV_H_ */
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