2 This file is part of systemd.
4 Copyright (C) 2014 Intel Corporation. All rights reserved.
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.
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.
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/>.
21 #include <sys/types.h>
22 #include <sys/socket.h>
24 #include <linux/if_packet.h>
27 #include <netinet/ip6.h>
28 #include <netinet/icmp6.h>
29 #include <netinet/in.h>
31 #include "socket-util.h"
33 #include "dhcp6-internal.h"
34 #include "dhcp6-protocol.h"
36 #define IN6ADDR_ALL_ROUTERS_MULTICAST_INIT \
37 { { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
38 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 } } }
40 #define IN6ADDR_ALL_NODES_MULTICAST_INIT \
41 { { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
42 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } } }
44 int dhcp_network_icmp6_bind_router_solicitation(int index)
46 struct icmp6_filter filter = { };
47 struct ipv6_mreq mreq = {
48 .ipv6mr_multiaddr = IN6ADDR_ALL_NODES_MULTICAST_INIT,
49 .ipv6mr_interface = index,
51 _cleanup_close_ int s = -1;
52 int r, zero = 0, hops = 255;
54 s = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK,
59 ICMP6_FILTER_SETBLOCKALL(&filter);
60 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter);
61 r = setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filter,
66 /* RFC 3315, section 6.7, bullet point 2 may indicate that an
67 IPV6_PKTINFO socket option also applies for ICMPv6 multicast.
68 Empirical experiments indicates otherwise and therefore an
69 IPV6_MULTICAST_IF socket option is used here instead */
70 r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, &index,
75 r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &zero,
80 r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops,
85 r = setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq,
95 int dhcp_network_icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr)
97 struct sockaddr_in6 dst = {
98 .sin6_family = AF_INET6,
99 .sin6_addr = IN6ADDR_ALL_ROUTERS_MULTICAST_INIT,
102 struct nd_router_solicit rs;
103 struct nd_opt_hdr rs_opt;
104 struct ether_addr rs_opt_mac;
106 .rs.nd_rs_type = ND_ROUTER_SOLICIT,
108 struct iovec iov[1] = {
111 struct msghdr msg = {
113 .msg_namelen = sizeof(dst),
120 memcpy(&rs.rs_opt_mac, ether_addr, ETH_ALEN);
121 rs.rs_opt.nd_opt_type = ND_OPT_SOURCE_LINKADDR;
122 rs.rs_opt.nd_opt_len = 1;
123 iov[0].iov_len = sizeof(rs);
125 iov[0].iov_len = sizeof(rs.rs);
127 r = sendmsg(s, &msg, 0);
134 int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) {
135 struct in6_pktinfo pktinfo = {
136 .ipi6_ifindex = index,
138 union sockaddr_union src = {
139 .in6.sin6_family = AF_INET6,
140 .in6.sin6_port = htobe16(DHCP6_PORT_CLIENT),
141 .in6.sin6_addr = IN6ADDR_ANY_INIT,
143 _cleanup_close_ int s = -1;
144 int r, off = 0, on = 1;
147 memcpy(&src.in6.sin6_addr, local_address,
148 sizeof(src.in6.sin6_addr));
150 s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
155 r = setsockopt(s, IPPROTO_IPV6, IPV6_PKTINFO, &pktinfo,
160 r = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
164 r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, sizeof(off));
168 r = bind(s, &src.sa, sizeof(src.in6));
177 int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address,
178 const void *packet, size_t len) {
179 union sockaddr_union dest = {
180 .in6.sin6_family = AF_INET6,
181 .in6.sin6_port = htobe16(DHCP6_PORT_SERVER),
185 assert(server_address);
187 memcpy(&dest.in6.sin6_addr, server_address, sizeof(dest.in6.sin6_addr));
189 r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in6));