1: /* dnsmasq is Copyright (c) 2000-2013 Simon Kelley
2:
3: This program is free software; you can redistribute it and/or modify
4: it under the terms of the GNU General Public License as published by
5: the Free Software Foundation; version 2 dated June, 1991, or
6: (at your option) version 3 dated 29 June, 2007.
7:
8: This program is distributed in the hope that it will be useful,
9: but WITHOUT ANY WARRANTY; without even the implied warranty of
10: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11: GNU General Public License for more details.
12:
13: You should have received a copy of the GNU General Public License
14: along with this program. If not, see <http://www.gnu.org/licenses/>.
15: */
16:
17: #include "dnsmasq.h"
18:
19: #ifdef HAVE_DHCP6
20:
21: #include <netinet/icmp6.h>
22:
23: static int ping_id = 0;
24:
25: void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force)
26: {
27: struct slaac_address *slaac, *old, **up;
28: struct dhcp_context *context;
29: int dns_dirty = 0;
30:
31: if (!(lease->flags & LEASE_HAVE_HWADDR) ||
32: (lease->flags & (LEASE_TA | LEASE_NA)) ||
33: lease->last_interface == 0 ||
34: !lease->hostname)
35: return ;
36:
37: old = lease->slaac_address;
38: lease->slaac_address = NULL;
39:
40: for (context = daemon->dhcp6; context; context = context->next)
41: if ((context->flags & CONTEXT_RA_NAME) && lease->last_interface == context->if_index)
42: {
43: struct in6_addr addr = context->start6;
44: if (lease->hwaddr_len == 6 &&
45: (lease->hwaddr_type == ARPHRD_ETHER || lease->hwaddr_type == ARPHRD_IEEE802))
46: {
47: /* convert MAC address to EUI-64 */
48: memcpy(&addr.s6_addr[8], lease->hwaddr, 3);
49: memcpy(&addr.s6_addr[13], &lease->hwaddr[3], 3);
50: addr.s6_addr[11] = 0xff;
51: addr.s6_addr[12] = 0xfe;
52: }
53: #if defined(ARPHRD_EUI64)
54: else if (lease->hwaddr_len == 8 &&
55: lease->hwaddr_type == ARPHRD_EUI64)
56: memcpy(&addr.s6_addr[8], lease->hwaddr, 8);
57: #endif
58: #if defined(ARPHRD_IEEE1394) && defined(ARPHRD_EUI64)
59: else if (lease->clid_len == 9 &&
60: lease->clid[0] == ARPHRD_EUI64 &&
61: lease->hwaddr_type == ARPHRD_IEEE1394)
62: /* firewire has EUI-64 identifier as clid */
63: memcpy(&addr.s6_addr[8], &lease->clid[1], 8);
64: #endif
65: else
66: continue;
67:
68: addr.s6_addr[8] ^= 0x02;
69:
70: /* check if we already have this one */
71: for (up = &old, slaac = old; slaac; slaac = slaac->next)
72: {
73: if (IN6_ARE_ADDR_EQUAL(&addr, &slaac->addr))
74: {
75: *up = slaac->next;
76: /* recheck when DHCPv4 goes through init-reboot */
77: if (force)
78: {
79: slaac->ping_time = now;
80: slaac->backoff = 1;
81: dns_dirty = 1;
82: }
83: break;
84: }
85: up = &slaac->next;
86: }
87:
88: /* No, make new one */
89: if (!slaac && (slaac = whine_malloc(sizeof(struct slaac_address))))
90: {
91: slaac->ping_time = now;
92: slaac->backoff = 1;
93: slaac->addr = addr;
94: slaac->local = context->local6;
95: /* Do RA's to prod it */
96: ra_start_unsolicted(now, context);
97: }
98:
99: if (slaac)
100: {
101: slaac->next = lease->slaac_address;
102: lease->slaac_address = slaac;
103: }
104: }
105:
106: if (old || dns_dirty)
107: lease_update_dns(1);
108:
109: /* Free any no reused */
110: for (; old; old = slaac)
111: {
112: slaac = old->next;
113: free(old);
114: }
115: }
116:
117:
118: time_t periodic_slaac(time_t now, struct dhcp_lease *leases)
119: {
120: struct dhcp_context *context;
121: struct dhcp_lease *lease;
122: struct slaac_address *slaac;
123: time_t next_event = 0;
124:
125: for (context = daemon->dhcp6; context; context = context->next)
126: if ((context->flags & CONTEXT_RA_NAME))
127: break;
128:
129: /* nothing configured */
130: if (!context)
131: return 0;
132:
133: while (ping_id == 0)
134: ping_id = rand16();
135:
136: for (lease = leases; lease; lease = lease->next)
137: for (slaac = lease->slaac_address; slaac; slaac = slaac->next)
138: {
139: /* confirmed or given up? */
140: if (slaac->backoff == 0 || slaac->ping_time == 0)
141: continue;
142:
143: if (difftime(slaac->ping_time, now) <= 0.0)
144: {
145: struct ping_packet *ping;
146: struct sockaddr_in6 addr;
147:
148: save_counter(0);
149: ping = expand(sizeof(struct ping_packet));
150: ping->type = ICMP6_ECHO_REQUEST;
151: ping->code = 0;
152: ping->identifier = ping_id;
153: ping->sequence_no = slaac->backoff;
154:
155: memset(&addr, 0, sizeof(addr));
156: #ifdef HAVE_SOCKADDR_SA_LEN
157: addr.sin6_len = sizeof(struct sockaddr_in6);
158: #endif
159: addr.sin6_family = AF_INET6;
160: addr.sin6_port = htons(IPPROTO_ICMPV6);
161: addr.sin6_addr = slaac->addr;
162:
163: if (sendto(daemon->icmp6fd, daemon->outpacket.iov_base, save_counter(0), 0,
164: (struct sockaddr *)&addr, sizeof(addr)) == -1 &&
165: errno == EHOSTUNREACH)
166: slaac->ping_time = 0; /* Give up */
167: else
168: {
169: slaac->ping_time += (1 << (slaac->backoff - 1)) + (rand16()/21785); /* 0 - 3 */
170: if (slaac->backoff > 4)
171: slaac->ping_time += rand16()/4000; /* 0 - 15 */
172: if (slaac->backoff < 12)
173: slaac->backoff++;
174: }
175: }
176:
177: if (slaac->ping_time != 0 &&
178: (next_event == 0 || difftime(next_event, slaac->ping_time) >= 0.0))
179: next_event = slaac->ping_time;
180: }
181:
182: return next_event;
183: }
184:
185:
186: void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases)
187: {
188: struct dhcp_lease *lease;
189: struct slaac_address *slaac;
190: struct ping_packet *ping = (struct ping_packet *)packet;
191: int gotone = 0;
192:
193: if (ping->identifier == ping_id)
194: for (lease = leases; lease; lease = lease->next)
195: for (slaac = lease->slaac_address; slaac; slaac = slaac->next)
196: if (slaac->backoff != 0 && IN6_ARE_ADDR_EQUAL(sender, &slaac->addr))
197: {
198: slaac->backoff = 0;
199: gotone = 1;
200: inet_ntop(AF_INET6, sender, daemon->addrbuff, ADDRSTRLEN);
201: my_syslog(MS_DHCP | LOG_INFO, "SLAAC-CONFIRM(%s) %s %s", interface, daemon->addrbuff, lease->hostname);
202: }
203:
204: lease_update_dns(gotone);
205: }
206:
207: #endif
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