1: /*
2: * BIRD -- Router Advertisement
3: *
4: * (c) 2011--2019 Ondrej Zajicek <santiago@crfreenet.org>
5: * (c) 2011--2019 CZ.NIC z.s.p.o.
6: *
7: * Can be freely distributed and used under the terms of the GNU GPL.
8: */
9:
10: #ifndef _BIRD_RADV_H_
11: #define _BIRD_RADV_H_
12:
13: #include "nest/bird.h"
14:
15: #include "lib/ip.h"
16: #include "lib/lists.h"
17: #include "lib/socket.h"
18: #include "lib/timer.h"
19: #include "lib/resource.h"
20: #include "nest/protocol.h"
21: #include "nest/iface.h"
22: #include "nest/route.h"
23: #include "nest/cli.h"
24: #include "nest/locks.h"
25: #include "conf/conf.h"
26: #include "lib/string.h"
27:
28:
29: #define ICMPV6_PROTO 58
30:
31: #define ICMPV6_RS 133
32: #define ICMPV6_RA 134
33:
34: #define MAX_INITIAL_RTR_ADVERTISEMENTS 3
35: #define MAX_INITIAL_RTR_ADVERT_INTERVAL (16 S_)
36:
37: #define DEFAULT_MAX_RA_INT 600
38: #define DEFAULT_MIN_DELAY 3
39: #define DEFAULT_CURRENT_HOP_LIMIT 64
40:
41: #define DEFAULT_VALID_LIFETIME 86400
42: #define DEFAULT_PREFERRED_LIFETIME 14400
43:
44: #define DEFAULT_DNS_LIFETIME_MULT 3
45:
46:
47: struct radv_config
48: {
49: struct proto_config c;
50: list patt_list; /* List of iface configs (struct radv_iface_config) */
51: list pref_list; /* Global list of prefix configs (struct radv_prefix_config) */
52: list rdnss_list; /* Global list of RDNSS configs (struct radv_rdnss_config) */
53: list dnssl_list; /* Global list of DNSSL configs (struct radv_dnssl_config) */
54:
55: net_addr trigger; /* Prefix of a trigger route, if 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: u8 solicited_ra_unicast; /* Send solicited RAs as unicast */
72:
73: u32 prefix_linger_time; /* How long we advertise dead prefixes with lifetime 0 */
74: u32 route_linger_time; /* How long we advertise dead routes with lifetime 0 */
75:
76: u8 rdnss_local; /* Global list is not used for RDNSS */
77: u8 dnssl_local; /* Global list is not used for DNSSL */
78:
79: u8 managed; /* Standard options from RFC 4861 */
80: u8 other_config;
81: u32 link_mtu;
82: u32 reachable_time;
83: u32 retrans_timer;
84: u32 current_hop_limit;
85: u32 default_lifetime;
86: u32 route_lifetime; /* Lifetime for the RFC 4191 routes */
87: u8 default_lifetime_sensitive; /* Whether default_lifetime depends on trigger */
88: u8 route_lifetime_sensitive; /* Whether route_lifetime depends on trigger */
89: u8 default_preference; /* Default Router Preference (RFC 4191) */
90: u8 route_preference; /* Specific Route Preference (RFC 4191) */
91: };
92:
93: struct radv_prefix_config
94: {
95: node n;
96: net_addr_ip6 prefix;
97:
98: u8 skip; /* Do not include this prefix to RA */
99: u8 onlink; /* Standard options from RFC 4861 */
100: u8 autonomous;
101: u32 valid_lifetime;
102: u32 preferred_lifetime;
103: u8 valid_lifetime_sensitive; /* Whether valid_lifetime depends on trigger */
104: u8 preferred_lifetime_sensitive; /* Whether preferred_lifetime depends on trigger */
105: };
106:
107: struct radv_rdnss_config
108: {
109: node n;
110: u32 lifetime; /* Valid if lifetime_mult is 0 */
111: u16 lifetime_mult; /* Lifetime specified as multiple of max_ra_int */
112: ip6_addr server; /* IP address of recursive DNS server */
113: };
114:
115: struct radv_dnssl_config
116: {
117: node n;
118: u32 lifetime; /* Valid if lifetime_mult is 0 */
119: u16 lifetime_mult; /* Lifetime specified as multiple of max_ra_int */
120: u8 dlen_first; /* Length of first label in domain */
121: u8 dlen_all; /* Both dlen_ filled in radv_process_domain() */
122: char *domain; /* Domain for DNS search list, in processed form */
123: };
124:
125: /*
126: * One more specific route as per RFC 4191.
127: *
128: * Note that it does *not* contain the next hop field. The next hop is always
129: * the router sending the advertisment and the more specific route only allows
130: * overriding the preference of the route.
131: */
132: struct radv_route
133: {
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: btime changed; /* Last time when the route changed */
140:
141: struct fib_node n;
142: };
143:
144: struct radv_proto
145: {
146: struct proto p;
147: list iface_list; /* List of active ifaces */
148: u8 valid; /* Router is valid for forwarding, used for shutdown */
149: u8 active; /* Whether radv is active w.r.t. triggers */
150: u8 fib_up; /* FIB table (routes) is initialized */
151: struct fib routes; /* FIB table of specific routes (struct radv_route) */
152: btime prune_time; /* Next time of route table pruning */
153: };
154:
155: struct radv_prefix /* One prefix we advertise */
156: {
157: node n;
158: net_addr_ip6 prefix;
159:
160: u8 valid; /* Is the prefix valid? If not, we advertise it
161: with 0 lifetime, so clients stop using it */
162: u8 mark; /* A temporary mark for processing */
163: btime changed; /* Last time when the prefix changed */
164: struct radv_prefix_config *cf; /* The config tied to this prefix */
165: };
166:
167: struct radv_iface
168: {
169: node n;
170: struct radv_proto *ra;
171: struct radv_iface_config *cf; /* Related config, must be updated in reconfigure */
172: struct iface *iface;
173: struct ifa *addr; /* Link-local address of iface */
174: struct pool *pool; /* A pool for interface-specific things */
175: list prefixes; /* The prefixes we advertise (struct radv_prefix) */
176: btime prune_time; /* Next time of prefix list pruning */
177: btime valid_time; /* Cached packet is valid until first linger timeout */
178:
179: timer *timer;
180: struct object_lock *lock;
181: sock *sk;
182:
183: btime last; /* Time of last sending of RA */
184: u16 plen; /* Length of prepared RA in tbuf, or 0 if not valid */
185: byte initial; /* How many RAs are still to be sent as initial */
186: };
187:
188: #define RA_EV_INIT 1 /* Switch to initial mode */
189: #define RA_EV_CHANGE 2 /* Change of options or prefixes */
190: #define RA_EV_RS 3 /* Received RS */
191:
192: /* Default Router Preferences (RFC 4191) */
193: #define RA_PREF_LOW 0x18
194: #define RA_PREF_MEDIUM 0x00
195: #define RA_PREF_HIGH 0x08
196: #define RA_PREF_MASK 0x18
197:
198: /* Attributes */
199: #define EA_RA_PREFERENCE EA_CODE(PROTOCOL_RADV, 0)
200: #define EA_RA_LIFETIME EA_CODE(PROTOCOL_RADV, 1)
201:
202: #ifdef LOCAL_DEBUG
203: #define RADV_FORCE_DEBUG 1
204: #else
205: #define RADV_FORCE_DEBUG 0
206: #endif
207: #define RADV_TRACE(flags, msg, args...) do { if ((p->p.debug & flags) || RADV_FORCE_DEBUG) \
208: log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
209:
210:
211: /* Invalidate cached RA packet */
212: static inline void radv_invalidate(struct radv_iface *ifa)
213: { ifa->plen = 0; }
214:
215: /* radv.c */
216: void radv_iface_notify(struct radv_iface *ifa, int event);
217:
218: /* packets.c */
219: int radv_process_domain(struct radv_dnssl_config *cf);
220: void radv_send_ra(struct radv_iface *ifa, ip_addr to);
221: int radv_sk_open(struct radv_iface *ifa);
222:
223:
224:
225: #endif /* _BIRD_RADV_H_ */
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