]>
Commit | Line | Data |
---|---|---|
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 | ||
edda10f2 FS |
6 | /* Make sure the net/if.h header is included before any linux/ one */ |
7 | #include <net/if.h> | |
940367a0 | 8 | #include <errno.h> |
edda10f2 | 9 | #include <linux/if_packet.h> |
940367a0 TG |
10 | #include <netinet/icmp6.h> |
11 | #include <netinet/in.h> | |
3ffd4af2 LP |
12 | #include <netinet/ip6.h> |
13 | #include <stdio.h> | |
14 | #include <string.h> | |
3ffd4af2 LP |
15 | #include <sys/types.h> |
16 | #include <unistd.h> | |
940367a0 | 17 | |
3ffd4af2 | 18 | #include "fd-util.h" |
940367a0 | 19 | #include "icmp6-util.h" |
88d5a3db | 20 | #include "in-addr-util.h" |
bd1ae178 | 21 | #include "iovec-util.h" |
dd59d5e5 | 22 | #include "network-common.h" |
5cfa2c3d | 23 | #include "socket-util.h" |
940367a0 | 24 | |
37c011e7 YW |
25 | int icmp6_bind(int ifindex, bool is_router) { |
26 | struct icmp6_filter filter = {}; | |
27 | struct ipv6_mreq mreq; | |
5bb1d7fb | 28 | _cleanup_close_ int s = -EBADF; |
1e7a0e21 | 29 | int r; |
940367a0 | 30 | |
37c011e7 YW |
31 | assert(ifindex > 0); |
32 | ||
33 | ICMP6_FILTER_SETBLOCKALL(&filter); | |
34 | if (is_router) { | |
35 | mreq = (struct ipv6_mreq) { | |
2c28eb02 | 36 | .ipv6mr_multiaddr = IN6_ADDR_ALL_ROUTERS_MULTICAST, |
37c011e7 YW |
37 | .ipv6mr_interface = ifindex, |
38 | }; | |
39 | ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filter); | |
40 | } else { | |
41 | mreq = (struct ipv6_mreq) { | |
2c28eb02 | 42 | .ipv6mr_multiaddr = IN6_ADDR_ALL_NODES_MULTICAST, |
37c011e7 YW |
43 | .ipv6mr_interface = ifindex, |
44 | }; | |
45 | ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter); | |
696eb2b8 | 46 | ICMP6_FILTER_SETPASS(ND_NEIGHBOR_ADVERT, &filter); |
44e8cf30 | 47 | ICMP6_FILTER_SETPASS(ND_REDIRECT, &filter); |
37c011e7 | 48 | } |
113e124f | 49 | |
cddf4d81 | 50 | s = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_ICMPV6); |
940367a0 TG |
51 | if (s < 0) |
52 | return -errno; | |
53 | ||
37c011e7 | 54 | if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filter, sizeof(filter)) < 0) |
6142bb37 PF |
55 | return -errno; |
56 | ||
37c011e7 | 57 | if (setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) |
940367a0 TG |
58 | return -errno; |
59 | ||
37c011e7 YW |
60 | /* RFC 3315, section 6.7, bullet point 2 may indicate that an IPV6_PKTINFO socket option also applies |
61 | * for ICMPv6 multicast. Empirical experiments indicates otherwise and therefore an IPV6_MULTICAST_IF | |
62 | * socket option is used here instead. */ | |
953a02d1 | 63 | r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, ifindex); |
940367a0 | 64 | if (r < 0) |
9e5b6496 | 65 | return r; |
940367a0 | 66 | |
2ff48e98 | 67 | r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, false); |
940367a0 | 68 | if (r < 0) |
2ff48e98 | 69 | return r; |
940367a0 | 70 | |
9e5b6496 | 71 | r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 255); |
940367a0 | 72 | if (r < 0) |
9e5b6496 | 73 | return r; |
940367a0 | 74 | |
9e5b6496 | 75 | r = setsockopt_int(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 255); |
cddf4d81 | 76 | if (r < 0) |
9e5b6496 | 77 | return r; |
cddf4d81 | 78 | |
2ff48e98 | 79 | r = setsockopt_int(s, SOL_IPV6, IPV6_RECVHOPLIMIT, true); |
940367a0 | 80 | if (r < 0) |
2ff48e98 | 81 | return r; |
940367a0 | 82 | |
2ff48e98 | 83 | r = setsockopt_int(s, SOL_SOCKET, SO_TIMESTAMP, true); |
1e7a0e21 | 84 | if (r < 0) |
2ff48e98 | 85 | return r; |
1e7a0e21 | 86 | |
953a02d1 | 87 | r = socket_bind_to_ifindex(s, ifindex); |
15fec93b | 88 | if (r < 0) |
953a02d1 | 89 | return r; |
15fec93b | 90 | |
c10d6bdb | 91 | return TAKE_FD(s); |
940367a0 TG |
92 | } |
93 | ||
ac336e75 YW |
94 | int icmp6_send(int fd, const struct in6_addr *dst, const struct iovec *iov, size_t n_iov) { |
95 | struct sockaddr_in6 sa = { | |
96 | .sin6_family = AF_INET6, | |
97 | .sin6_addr = *ASSERT_PTR(dst), | |
98 | }; | |
ca114462 | 99 | struct msghdr msg = { |
ac336e75 | 100 | .msg_name = &sa, |
ca114462 YW |
101 | .msg_namelen = sizeof(struct sockaddr_in6), |
102 | .msg_iov = (struct iovec*) iov, | |
103 | .msg_iovlen = n_iov, | |
104 | }; | |
105 | ||
ac336e75 YW |
106 | assert(fd >= 0); |
107 | ||
ca114462 YW |
108 | if (sendmsg(fd, &msg, 0) < 0) |
109 | return -errno; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
51211638 YW |
114 | int icmp6_receive( |
115 | int fd, | |
116 | void *buffer, | |
117 | size_t size, | |
118 | struct in6_addr *ret_sender, | |
119 | triple_timestamp *ret_timestamp) { | |
fb29cdbe | 120 | |
f782eee6 | 121 | /* This needs to be initialized with zero. See #20741. */ |
fb29cdbe | 122 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int)) + /* ttl */ |
f782eee6 | 123 | CMSG_SPACE_TIMEVAL) control = {}; |
88d5a3db PF |
124 | struct iovec iov = {}; |
125 | union sockaddr_union sa = {}; | |
126 | struct msghdr msg = { | |
127 | .msg_name = &sa.sa, | |
128 | .msg_namelen = sizeof(sa), | |
129 | .msg_iov = &iov, | |
130 | .msg_iovlen = 1, | |
131 | .msg_control = &control, | |
132 | .msg_controllen = sizeof(control), | |
133 | }; | |
88d5a3db PF |
134 | ssize_t len; |
135 | ||
5cfa2c3d | 136 | iov = IOVEC_MAKE(buffer, size); |
88d5a3db | 137 | |
2adfd1bd | 138 | len = recvmsg_safe(fd, &msg, MSG_DONTWAIT); |
14f37112 | 139 | if (len < 0) |
2adfd1bd | 140 | return (int) len; |
88d5a3db PF |
141 | |
142 | if ((size_t) len != size) | |
143 | return -EINVAL; | |
144 | ||
9f0430b7 | 145 | if (msg.msg_namelen != sizeof(struct sockaddr_in6) || sa.in6.sin6_family != AF_INET6) |
88d5a3db PF |
146 | return -EPFNOSUPPORT; |
147 | ||
9f0430b7 YW |
148 | if (!in6_addr_is_link_local(&sa.in6.sin6_addr) && !in6_addr_is_null(&sa.in6.sin6_addr)) |
149 | return -EADDRNOTAVAIL; | |
88d5a3db | 150 | |
88d5a3db PF |
151 | assert(!(msg.msg_flags & MSG_TRUNC)); |
152 | ||
dd59d5e5 YW |
153 | int *hops = CMSG_FIND_DATA(&msg, SOL_IPV6, IPV6_HOPLIMIT, int); |
154 | if (hops && *hops != 255) | |
155 | return -EMULTIHOP; | |
88d5a3db | 156 | |
dd59d5e5 YW |
157 | if (ret_timestamp) |
158 | triple_timestamp_from_cmsg(ret_timestamp, &msg); | |
51211638 | 159 | if (ret_sender) |
9f0430b7 | 160 | *ret_sender = sa.in6.sin6_addr; |
88d5a3db PF |
161 | return 0; |
162 | } |