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1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2014 Intel Corporation. All rights reserved. | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <errno.h> | |
3ffd4af2 LP |
21 | #include <netinet/in.h> |
22 | #include <netinet/ip6.h> | |
e3169126 | 23 | #include <stdio.h> |
3ffd4af2 LP |
24 | #include <string.h> |
25 | #include <sys/socket.h> | |
26 | #include <sys/types.h> | |
e3169126 | 27 | #include <unistd.h> |
3ffd4af2 | 28 | #include <linux/if_packet.h> |
e3169126 PF |
29 | |
30 | #include "dhcp6-internal.h" | |
34e8c5a2 | 31 | #include "dhcp6-protocol.h" |
3ffd4af2 LP |
32 | #include "fd-util.h" |
33 | #include "socket-util.h" | |
e3169126 | 34 | |
34e8c5a2 PF |
35 | int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) { |
36 | struct in6_pktinfo pktinfo = { | |
37 | .ipi6_ifindex = index, | |
38 | }; | |
39 | union sockaddr_union src = { | |
40 | .in6.sin6_family = AF_INET6, | |
41 | .in6.sin6_port = htobe16(DHCP6_PORT_CLIENT), | |
42 | .in6.sin6_addr = IN6ADDR_ANY_INIT, | |
43 | }; | |
44 | _cleanup_close_ int s = -1; | |
45 | int r, off = 0, on = 1; | |
46 | ||
47 | if (local_address) | |
48 | memcpy(&src.in6.sin6_addr, local_address, | |
49 | sizeof(src.in6.sin6_addr)); | |
50 | ||
51 | s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, | |
52 | IPPROTO_UDP); | |
53 | if (s < 0) | |
54 | return -errno; | |
55 | ||
56 | r = setsockopt(s, IPPROTO_IPV6, IPV6_PKTINFO, &pktinfo, | |
57 | sizeof(pktinfo)); | |
58 | if (r < 0) | |
59 | return -errno; | |
60 | ||
61 | r = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)); | |
62 | if (r < 0) | |
63 | return -errno; | |
64 | ||
65 | r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, sizeof(off)); | |
66 | if (r < 0) | |
67 | return -errno; | |
68 | ||
69 | r = bind(s, &src.sa, sizeof(src.in6)); | |
70 | if (r < 0) | |
71 | return -errno; | |
72 | ||
73 | r = s; | |
74 | s = -1; | |
75 | return r; | |
76 | } | |
77 | ||
78 | int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address, | |
79 | const void *packet, size_t len) { | |
80 | union sockaddr_union dest = { | |
81 | .in6.sin6_family = AF_INET6, | |
82 | .in6.sin6_port = htobe16(DHCP6_PORT_SERVER), | |
83 | }; | |
84 | int r; | |
85 | ||
86 | assert(server_address); | |
87 | ||
88 | memcpy(&dest.in6.sin6_addr, server_address, sizeof(dest.in6.sin6_addr)); | |
89 | ||
90 | r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in6)); | |
91 | if (r < 0) | |
92 | return -errno; | |
93 | ||
94 | return 0; | |
95 | } |