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authorPatrik Flykt <patrik.flykt@linux.intel.com>2014-06-19 15:39:23 +0300
committerPatrik Flykt <patrik.flykt@linux.intel.com>2014-06-19 15:44:44 +0300
commit34e8c5a23cd1c53ef3c1169388dabe1f6dfd7319 (patch)
tree742eb792c6d3e3e23551cb3a665edf8219c3d2d6 /src/libsystemd-network/dhcp6-network.c
parentf12ed3bf0b315fc88d5fbdf5bdca14b218c86e0c (diff)
sd-dhcp6-client: Add functions to bind to DHCPv6 UDP socket
Add a function that creates a UDP socket bound to the given interface and optionally to an IPv6 address. Add another function that will send the DHCPv6 UDP packet to its destination. Using IPV6_PKTINFO in setsockopt to bind the IPv6 socket to an interface is documented in section 4. of RFC 3542, "Advanced Sockets Application Program Interface (API) for IPv6" Add a define for DHCPv6 Relay Agents and Servers multicast address as its not available elsewhere.
Diffstat (limited to 'src/libsystemd-network/dhcp6-network.c')
-rw-r--r--src/libsystemd-network/dhcp6-network.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/src/libsystemd-network/dhcp6-network.c b/src/libsystemd-network/dhcp6-network.c
index 53ce23d16c..fe56c10273 100644
--- a/src/libsystemd-network/dhcp6-network.c
+++ b/src/libsystemd-network/dhcp6-network.c
@@ -31,6 +31,7 @@
#include "socket-util.h"
#include "dhcp6-internal.h"
+#include "dhcp6-protocol.h"
#define IN6ADDR_ALL_ROUTERS_MULTICAST_INIT \
{ { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
@@ -129,3 +130,65 @@ int dhcp_network_icmp6_send_router_solicitation(int s, const struct ether_addr *
return 0;
}
+
+int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) {
+ struct in6_pktinfo pktinfo = {
+ .ipi6_ifindex = index,
+ };
+ union sockaddr_union src = {
+ .in6.sin6_family = AF_INET6,
+ .in6.sin6_port = htobe16(DHCP6_PORT_CLIENT),
+ .in6.sin6_addr = IN6ADDR_ANY_INIT,
+ };
+ _cleanup_close_ int s = -1;
+ int r, off = 0, on = 1;
+
+ if (local_address)
+ memcpy(&src.in6.sin6_addr, local_address,
+ sizeof(src.in6.sin6_addr));
+
+ s = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
+ IPPROTO_UDP);
+ if (s < 0)
+ return -errno;
+
+ r = setsockopt(s, IPPROTO_IPV6, IPV6_PKTINFO, &pktinfo,
+ sizeof(pktinfo));
+ if (r < 0)
+ return -errno;
+
+ r = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
+ if (r < 0)
+ return -errno;
+
+ r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, sizeof(off));
+ if (r < 0)
+ return -errno;
+
+ r = bind(s, &src.sa, sizeof(src.in6));
+ if (r < 0)
+ return -errno;
+
+ r = s;
+ s = -1;
+ return r;
+}
+
+int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address,
+ const void *packet, size_t len) {
+ union sockaddr_union dest = {
+ .in6.sin6_family = AF_INET6,
+ .in6.sin6_port = htobe16(DHCP6_PORT_SERVER),
+ };
+ int r;
+
+ assert(server_address);
+
+ memcpy(&dest.in6.sin6_addr, server_address, sizeof(dest.in6.sin6_addr));
+
+ r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in6));
+ if (r < 0)
+ return -errno;
+
+ return 0;
+}