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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
940367a0 | 2 | /*** |
810adae9 | 3 | Copyright © 2014 Intel Corporation. All rights reserved. |
940367a0 TG |
4 | ***/ |
5 | ||
6 | #include <errno.h> | |
940367a0 TG |
7 | #include <netinet/icmp6.h> |
8 | #include <netinet/in.h> | |
3ffd4af2 LP |
9 | #include <netinet/ip6.h> |
10 | #include <stdio.h> | |
11 | #include <string.h> | |
3ffd4af2 LP |
12 | #include <sys/types.h> |
13 | #include <unistd.h> | |
15fec93b | 14 | #include <net/if.h> |
3ffd4af2 | 15 | #include <linux/if_packet.h> |
940367a0 | 16 | |
3ffd4af2 | 17 | #include "fd-util.h" |
940367a0 | 18 | #include "icmp6-util.h" |
88d5a3db | 19 | #include "in-addr-util.h" |
bd1ae178 | 20 | #include "iovec-util.h" |
dd59d5e5 | 21 | #include "network-common.h" |
5cfa2c3d | 22 | #include "socket-util.h" |
940367a0 TG |
23 | |
24 | #define IN6ADDR_ALL_ROUTERS_MULTICAST_INIT \ | |
25 | { { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \ | |
26 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 } } } | |
27 | ||
28 | #define IN6ADDR_ALL_NODES_MULTICAST_INIT \ | |
29 | { { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \ | |
30 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } } } | |
31 | ||
6142bb37 PF |
32 | static int icmp6_bind_router_message(const struct icmp6_filter *filter, |
33 | const struct ipv6_mreq *mreq) { | |
953a02d1 | 34 | int ifindex = mreq->ipv6mr_interface; |
5bb1d7fb | 35 | _cleanup_close_ int s = -EBADF; |
1e7a0e21 | 36 | int r; |
940367a0 | 37 | |
113e124f YW |
38 | assert(filter); |
39 | assert(mreq); | |
40 | ||
cddf4d81 | 41 | s = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_ICMPV6); |
940367a0 TG |
42 | if (s < 0) |
43 | return -errno; | |
44 | ||
113e124f | 45 | if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, filter, sizeof(*filter)) < 0) |
6142bb37 PF |
46 | return -errno; |
47 | ||
113e124f | 48 | if (setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, mreq, sizeof(*mreq)) < 0) |
940367a0 TG |
49 | return -errno; |
50 | ||
51 | /* RFC 3315, section 6.7, bullet point 2 may indicate that an | |
52 | IPV6_PKTINFO socket option also applies for ICMPv6 multicast. | |
53 | Empirical experiments indicates otherwise and therefore an | |
54 | IPV6_MULTICAST_IF socket option is used here instead */ | |
953a02d1 | 55 | r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, ifindex); |
940367a0 | 56 | if (r < 0) |
9e5b6496 | 57 | return r; |
940367a0 | 58 | |
2ff48e98 | 59 | r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, false); |
940367a0 | 60 | if (r < 0) |
2ff48e98 | 61 | return r; |
940367a0 | 62 | |
9e5b6496 | 63 | r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 255); |
940367a0 | 64 | if (r < 0) |
9e5b6496 | 65 | return r; |
940367a0 | 66 | |
9e5b6496 | 67 | r = setsockopt_int(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 255); |
cddf4d81 | 68 | if (r < 0) |
9e5b6496 | 69 | return r; |
cddf4d81 | 70 | |
2ff48e98 | 71 | r = setsockopt_int(s, SOL_IPV6, IPV6_RECVHOPLIMIT, true); |
940367a0 | 72 | if (r < 0) |
2ff48e98 | 73 | return r; |
940367a0 | 74 | |
2ff48e98 | 75 | r = setsockopt_int(s, SOL_SOCKET, SO_TIMESTAMP, true); |
1e7a0e21 | 76 | if (r < 0) |
2ff48e98 | 77 | return r; |
1e7a0e21 | 78 | |
953a02d1 | 79 | r = socket_bind_to_ifindex(s, ifindex); |
15fec93b | 80 | if (r < 0) |
953a02d1 | 81 | return r; |
15fec93b | 82 | |
c10d6bdb | 83 | return TAKE_FD(s); |
940367a0 TG |
84 | } |
85 | ||
1a6c9136 | 86 | int icmp6_bind_router_solicitation(int ifindex) { |
6142bb37 PF |
87 | struct icmp6_filter filter = {}; |
88 | struct ipv6_mreq mreq = { | |
89 | .ipv6mr_multiaddr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
1a6c9136 | 90 | .ipv6mr_interface = ifindex, |
6142bb37 PF |
91 | }; |
92 | ||
93 | ICMP6_FILTER_SETBLOCKALL(&filter); | |
94 | ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter); | |
95 | ||
96 | return icmp6_bind_router_message(&filter, &mreq); | |
97 | } | |
98 | ||
1a6c9136 | 99 | int icmp6_bind_router_advertisement(int ifindex) { |
6142bb37 PF |
100 | struct icmp6_filter filter = {}; |
101 | struct ipv6_mreq mreq = { | |
102 | .ipv6mr_multiaddr = IN6ADDR_ALL_ROUTERS_MULTICAST_INIT, | |
1a6c9136 | 103 | .ipv6mr_interface = ifindex, |
6142bb37 PF |
104 | }; |
105 | ||
106 | ICMP6_FILTER_SETBLOCKALL(&filter); | |
107 | ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filter); | |
108 | ||
109 | return icmp6_bind_router_message(&filter, &mreq); | |
110 | } | |
111 | ||
940367a0 TG |
112 | int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) { |
113 | struct sockaddr_in6 dst = { | |
114 | .sin6_family = AF_INET6, | |
115 | .sin6_addr = IN6ADDR_ALL_ROUTERS_MULTICAST_INIT, | |
116 | }; | |
117 | struct { | |
118 | struct nd_router_solicit rs; | |
119 | struct nd_opt_hdr rs_opt; | |
120 | struct ether_addr rs_opt_mac; | |
121 | } _packed_ rs = { | |
122 | .rs.nd_rs_type = ND_ROUTER_SOLICIT, | |
6d06ac1f TG |
123 | .rs_opt.nd_opt_type = ND_OPT_SOURCE_LINKADDR, |
124 | .rs_opt.nd_opt_len = 1, | |
940367a0 | 125 | }; |
6d06ac1f TG |
126 | struct iovec iov = { |
127 | .iov_base = &rs, | |
128 | .iov_len = sizeof(rs), | |
940367a0 TG |
129 | }; |
130 | struct msghdr msg = { | |
131 | .msg_name = &dst, | |
132 | .msg_namelen = sizeof(dst), | |
6d06ac1f | 133 | .msg_iov = &iov, |
940367a0 TG |
134 | .msg_iovlen = 1, |
135 | }; | |
940367a0 | 136 | |
6d06ac1f TG |
137 | assert(s >= 0); |
138 | assert(ether_addr); | |
139 | ||
140 | rs.rs_opt_mac = *ether_addr; | |
940367a0 | 141 | |
113e124f | 142 | if (sendmsg(s, &msg, 0) < 0) |
940367a0 TG |
143 | return -errno; |
144 | ||
145 | return 0; | |
146 | } | |
88d5a3db | 147 | |
51211638 YW |
148 | int icmp6_receive( |
149 | int fd, | |
150 | void *buffer, | |
151 | size_t size, | |
152 | struct in6_addr *ret_sender, | |
153 | triple_timestamp *ret_timestamp) { | |
fb29cdbe | 154 | |
f782eee6 | 155 | /* This needs to be initialized with zero. See #20741. */ |
fb29cdbe | 156 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int)) + /* ttl */ |
f782eee6 | 157 | CMSG_SPACE_TIMEVAL) control = {}; |
88d5a3db PF |
158 | struct iovec iov = {}; |
159 | union sockaddr_union sa = {}; | |
160 | struct msghdr msg = { | |
161 | .msg_name = &sa.sa, | |
162 | .msg_namelen = sizeof(sa), | |
163 | .msg_iov = &iov, | |
164 | .msg_iovlen = 1, | |
165 | .msg_control = &control, | |
166 | .msg_controllen = sizeof(control), | |
167 | }; | |
94876904 | 168 | struct in6_addr addr = {}; |
88d5a3db PF |
169 | ssize_t len; |
170 | ||
5cfa2c3d | 171 | iov = IOVEC_MAKE(buffer, size); |
88d5a3db | 172 | |
2adfd1bd | 173 | len = recvmsg_safe(fd, &msg, MSG_DONTWAIT); |
14f37112 | 174 | if (len < 0) |
2adfd1bd | 175 | return (int) len; |
88d5a3db PF |
176 | |
177 | if ((size_t) len != size) | |
178 | return -EINVAL; | |
179 | ||
180 | if (msg.msg_namelen == sizeof(struct sockaddr_in6) && | |
181 | sa.in6.sin6_family == AF_INET6) { | |
182 | ||
94876904 | 183 | addr = sa.in6.sin6_addr; |
4961f566 | 184 | if (!in6_addr_is_link_local(&addr) && !in6_addr_is_null(&addr)) |
88d5a3db PF |
185 | return -EADDRNOTAVAIL; |
186 | ||
187 | } else if (msg.msg_namelen > 0) | |
188 | return -EPFNOSUPPORT; | |
189 | ||
190 | /* namelen == 0 only happens when running the test-suite over a socketpair */ | |
191 | ||
88d5a3db PF |
192 | assert(!(msg.msg_flags & MSG_TRUNC)); |
193 | ||
dd59d5e5 YW |
194 | int *hops = CMSG_FIND_DATA(&msg, SOL_IPV6, IPV6_HOPLIMIT, int); |
195 | if (hops && *hops != 255) | |
196 | return -EMULTIHOP; | |
88d5a3db | 197 | |
dd59d5e5 YW |
198 | if (ret_timestamp) |
199 | triple_timestamp_from_cmsg(ret_timestamp, &msg); | |
51211638 YW |
200 | if (ret_sender) |
201 | *ret_sender = addr; | |
88d5a3db PF |
202 | return 0; |
203 | } |