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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e3169126 PF |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright (C) 2014 Intel Corporation. All rights reserved. | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <errno.h> | |
3ffd4af2 LP |
22 | #include <netinet/in.h> |
23 | #include <netinet/ip6.h> | |
e3169126 | 24 | #include <stdio.h> |
3ffd4af2 LP |
25 | #include <string.h> |
26 | #include <sys/socket.h> | |
27 | #include <sys/types.h> | |
e3169126 | 28 | #include <unistd.h> |
3ffd4af2 | 29 | #include <linux/if_packet.h> |
e3169126 PF |
30 | |
31 | #include "dhcp6-internal.h" | |
34e8c5a2 | 32 | #include "dhcp6-protocol.h" |
3ffd4af2 LP |
33 | #include "fd-util.h" |
34 | #include "socket-util.h" | |
e3169126 | 35 | |
34e8c5a2 | 36 | int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) { |
34e8c5a2 PF |
37 | union sockaddr_union src = { |
38 | .in6.sin6_family = AF_INET6, | |
39 | .in6.sin6_port = htobe16(DHCP6_PORT_CLIENT), | |
c601ebf7 | 40 | .in6.sin6_scope_id = index, |
34e8c5a2 PF |
41 | }; |
42 | _cleanup_close_ int s = -1; | |
43 | int r, off = 0, on = 1; | |
44 | ||
c601ebf7 TG |
45 | assert(index > 0); |
46 | assert(local_address); | |
47 | ||
48 | src.in6.sin6_addr = *local_address; | |
34e8c5a2 | 49 | |
6506063f | 50 | s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_UDP); |
34e8c5a2 PF |
51 | if (s < 0) |
52 | return -errno; | |
53 | ||
34e8c5a2 PF |
54 | r = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)); |
55 | if (r < 0) | |
56 | return -errno; | |
57 | ||
58 | r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, sizeof(off)); | |
59 | if (r < 0) | |
60 | return -errno; | |
61 | ||
6506063f TG |
62 | r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
63 | if (r < 0) | |
64 | return -errno; | |
65 | ||
34e8c5a2 PF |
66 | r = bind(s, &src.sa, sizeof(src.in6)); |
67 | if (r < 0) | |
68 | return -errno; | |
69 | ||
70 | r = s; | |
71 | s = -1; | |
72 | return r; | |
73 | } | |
74 | ||
75 | int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address, | |
76 | const void *packet, size_t len) { | |
77 | union sockaddr_union dest = { | |
78 | .in6.sin6_family = AF_INET6, | |
79 | .in6.sin6_port = htobe16(DHCP6_PORT_SERVER), | |
80 | }; | |
81 | int r; | |
82 | ||
83 | assert(server_address); | |
84 | ||
85 | memcpy(&dest.in6.sin6_addr, server_address, sizeof(dest.in6.sin6_addr)); | |
86 | ||
87 | r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in6)); | |
88 | if (r < 0) | |
89 | return -errno; | |
90 | ||
91 | return 0; | |
92 | } |