summaryrefslogtreecommitdiff
path: root/src/libsystemd-network/icmp6-util.c
diff options
context:
space:
mode:
authorTom Gundersen <teg@jklm.no>2015-10-16 18:09:10 +0200
committerTom Gundersen <teg@jklm.no>2015-10-22 17:19:54 +0200
commit940367a0abb4cc4460922cc2fb933ba278a2afbb (patch)
treee320409b915bb4dab92be7d64e85cdeac242fa2e /src/libsystemd-network/icmp6-util.c
parentde1e9928f137f4d17f463956a7612d9676c393aa (diff)
libsystemd-network: split icm6-util.[ch] out of dhcp6 code
Diffstat (limited to 'src/libsystemd-network/icmp6-util.c')
-rw-r--r--src/libsystemd-network/icmp6-util.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/src/libsystemd-network/icmp6-util.c b/src/libsystemd-network/icmp6-util.c
new file mode 100644
index 0000000000..140429b1e9
--- /dev/null
+++ b/src/libsystemd-network/icmp6-util.c
@@ -0,0 +1,129 @@
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2014 Intel Corporation. All rights reserved.
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <string.h>
+#include <linux/if_packet.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
+#include <netinet/in.h>
+
+#include "socket-util.h"
+
+#include "icmp6-util.h"
+
+#define IN6ADDR_ALL_ROUTERS_MULTICAST_INIT \
+ { { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 } } }
+
+#define IN6ADDR_ALL_NODES_MULTICAST_INIT \
+ { { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } } }
+
+int icmp6_bind_router_solicitation(int index) {
+ struct icmp6_filter filter = { };
+ struct ipv6_mreq mreq = {
+ .ipv6mr_multiaddr = IN6ADDR_ALL_NODES_MULTICAST_INIT,
+ .ipv6mr_interface = index,
+ };
+ _cleanup_close_ int s = -1;
+ int r, zero = 0, hops = 255;
+
+ s = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK,
+ IPPROTO_ICMPV6);
+ if (s < 0)
+ return -errno;
+
+ ICMP6_FILTER_SETBLOCKALL(&filter);
+ ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter);
+ r = setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filter,
+ sizeof(filter));
+ if (r < 0)
+ return -errno;
+
+ /* RFC 3315, section 6.7, bullet point 2 may indicate that an
+ IPV6_PKTINFO socket option also applies for ICMPv6 multicast.
+ Empirical experiments indicates otherwise and therefore an
+ IPV6_MULTICAST_IF socket option is used here instead */
+ r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, &index,
+ sizeof(index));
+ if (r < 0)
+ return -errno;
+
+ r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &zero,
+ sizeof(zero));
+ if (r < 0)
+ return -errno;
+
+ r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops,
+ sizeof(hops));
+ if (r < 0)
+ return -errno;
+
+ r = setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq,
+ sizeof(mreq));
+ if (r < 0)
+ return -errno;
+
+ r = s;
+ s = -1;
+ return r;
+}
+
+int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) {
+ struct sockaddr_in6 dst = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6ADDR_ALL_ROUTERS_MULTICAST_INIT,
+ };
+ struct {
+ struct nd_router_solicit rs;
+ struct nd_opt_hdr rs_opt;
+ struct ether_addr rs_opt_mac;
+ } _packed_ rs = {
+ .rs.nd_rs_type = ND_ROUTER_SOLICIT,
+ };
+ struct iovec iov[1] = {
+ { &rs, },
+ };
+ struct msghdr msg = {
+ .msg_name = &dst,
+ .msg_namelen = sizeof(dst),
+ .msg_iov = iov,
+ .msg_iovlen = 1,
+ };
+ int r;
+
+ if (ether_addr) {
+ memcpy(&rs.rs_opt_mac, ether_addr, ETH_ALEN);
+ rs.rs_opt.nd_opt_type = ND_OPT_SOURCE_LINKADDR;
+ rs.rs_opt.nd_opt_len = 1;
+ iov[0].iov_len = sizeof(rs);
+ } else
+ iov[0].iov_len = sizeof(rs.rs);
+
+ r = sendmsg(s, &msg, 0);
+ if (r < 0)
+ return -errno;
+
+ return 0;
+}