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authorDmitrij Tejblum <tejblum@yandex-team.ru>2011-08-18 20:22:17 +0400
committerDmitrij Tejblum <tejblum@yandex-team.ru>2011-08-19 22:02:17 +0400
commitbf510e9bc06b55ae9d9c1d6ed67152b94e80977e (patch)
tree4466103c8ad05307cbd88c7509c8ff03976f260f /lib
parent9fa6be78ecbbda17be20b8d2bc4fdde915e33d7e (diff)
lib: simplify interface of setsockopt_multicast_ipv4().
* sockopt.[ch] (setsockopt_ipv4_multicast): ifindex is now mandatory (all non-ancient OSes can use it anyway), and if_addr parameter (the address of the interface) is now gone. (setsockopt_ipv4_multicast_if): IP_MULTICAST_IF processing moved to this new function * ospf_network.c (ospf_if_add_allspfrouters, ospf_if_drop_allspfrouters, ospf_if_add_alldrouters, ospf_if_drop_alldrouters, ospf_if_ipmulticast), rip_interface.c (ipv4_multicast_join, ipv4_multicast_leave, rip_interface_new): adapt to the new interface
Diffstat (limited to 'lib')
-rw-r--r--lib/sockopt.c77
-rw-r--r--lib/sockopt.h10
2 files changed, 49 insertions, 38 deletions
diff --git a/lib/sockopt.c b/lib/sockopt.c
index 6ab97689..1f9f5275 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -184,7 +184,7 @@ getsockopt_ipv6_ifindex (struct msghdr *msgh)
/*
* Process multicast socket options for IPv4 in an OS-dependent manner.
- * Supported options are IP_MULTICAST_IF and IP_{ADD,DROP}_MEMBERSHIP.
+ * Supported options are IP_{ADD,DROP}_MEMBERSHIP.
*
* Many operating systems have a limit on the number of groups that
* can be joined per socket (where each group and local address
@@ -204,22 +204,18 @@ getsockopt_ipv6_ifindex (struct msghdr *msgh)
* allow leaves, or implicitly leave all groups joined to down interfaces.
*/
int
-setsockopt_multicast_ipv4(int sock,
+setsockopt_ipv4_multicast(int sock,
int optname,
- struct in_addr if_addr /* required */,
unsigned int mcast_addr,
- unsigned int ifindex /* optional: if non-zero, may be
- used instead of if_addr */)
+ unsigned int ifindex)
{
#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
- /* This is better because it uses ifindex directly */
struct ip_mreqn mreqn;
int ret;
switch (optname)
{
- case IP_MULTICAST_IF:
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
memset (&mreqn, 0, sizeof(mreqn));
@@ -227,23 +223,19 @@ setsockopt_multicast_ipv4(int sock,
if (mcast_addr)
mreqn.imr_multiaddr.s_addr = mcast_addr;
- if (ifindex)
- mreqn.imr_ifindex = ifindex;
- else
- mreqn.imr_address = if_addr;
+ mreqn.imr_ifindex = ifindex;
ret = setsockopt(sock, IPPROTO_IP, optname,
(void *)&mreqn, sizeof(mreqn));
if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP) && (errno == EADDRINUSE))
{
/* see above: handle possible problem when interface comes back up */
- char buf[2][INET_ADDRSTRLEN];
- zlog_info("setsockopt_multicast_ipv4 attempting to drop and "
- "re-add (fd %d, ifaddr %s, mcast %s, ifindex %u)",
+ char buf[1][INET_ADDRSTRLEN];
+ zlog_info("setsockopt_ipv4_multicast attempting to drop and "
+ "re-add (fd %d, mcast %s, ifindex %u)",
sock,
- inet_ntop(AF_INET, &if_addr, buf[0], sizeof(buf[0])),
inet_ntop(AF_INET, &mreqn.imr_multiaddr,
- buf[1], sizeof(buf[1])), ifindex);
+ buf[0], sizeof(buf[0])), ifindex);
setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP,
(void *)&mreqn, sizeof(mreqn));
ret = setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
@@ -264,26 +256,17 @@ setsockopt_multicast_ipv4(int sock,
/* #elif defined(BOGON_NIX) && EXAMPLE_VERSION_CODE > -100000 */
/* Add your favourite OS here! */
-#else /* #if OS_TYPE */
+#elif defined(HAVE_BSD_STRUCT_IP_MREQ_HACK) /* #if OS_TYPE */
/* standard BSD API */
struct in_addr m;
struct ip_mreq mreq;
int ret;
-#ifdef HAVE_BSD_STRUCT_IP_MREQ_HACK
- if (ifindex)
- m.s_addr = htonl(ifindex);
- else
-#endif
- m = if_addr;
+ m.s_addr = htonl(ifindex);
switch (optname)
{
- case IP_MULTICAST_IF:
- return setsockopt (sock, IPPROTO_IP, optname, (void *)&m, sizeof(m));
- break;
-
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
memset (&mreq, 0, sizeof(mreq));
@@ -294,13 +277,12 @@ setsockopt_multicast_ipv4(int sock,
if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP) && (errno == EADDRINUSE))
{
/* see above: handle possible problem when interface comes back up */
- char buf[2][INET_ADDRSTRLEN];
- zlog_info("setsockopt_multicast_ipv4 attempting to drop and "
- "re-add (fd %d, ifaddr %s, mcast %s, ifindex %u)",
+ char buf[1][INET_ADDRSTRLEN];
+ zlog_info("setsockopt_ipv4_multicast attempting to drop and "
+ "re-add (fd %d, mcast %s, ifindex %u)",
sock,
- inet_ntop(AF_INET, &if_addr, buf[0], sizeof(buf[0])),
inet_ntop(AF_INET, &mreq.imr_multiaddr,
- buf[1], sizeof(buf[1])), ifindex);
+ buf[0], sizeof(buf[0])), ifindex);
setsockopt (sock, IPPROTO_IP, IP_DROP_MEMBERSHIP,
(void *)&mreq, sizeof(mreq));
ret = setsockopt (sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
@@ -315,10 +297,41 @@ setsockopt_multicast_ipv4(int sock,
return -1;
break;
}
+#else
+ #error "Unsupported multicast API"
#endif /* #if OS_TYPE */
}
+/*
+ * Set IP_MULTICAST_IF socket option in an OS-dependent manner.
+ */
+int
+setsockopt_ipv4_multicast_if(int sock,
+ unsigned int ifindex)
+{
+
+#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
+ struct ip_mreqn mreqn;
+
+ mreqn.imr_ifindex = ifindex;
+ return setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, (void *)&mreqn, sizeof(mreqn));
+
+ /* Example defines for another OS, boilerplate off other code in this
+ function */
+ /* #elif defined(BOGON_NIX) && EXAMPLE_VERSION_CODE > -100000 */
+ /* Add your favourite OS here! */
+#elif defined(HAVE_BSD_STRUCT_IP_MREQ_HACK)
+ struct in_addr m;
+
+ m.s_addr = htonl(ifindex);
+
+ return setsockopt (sock, IPPROTO_IP, IP_MULTICAST_IF, (void *)&m, sizeof(m));
+#else
+ #error "Unsupported multicast API"
+#endif
+}
+
static int
setsockopt_ipv4_ifindex (int sock, int val)
{
diff --git a/lib/sockopt.h b/lib/sockopt.h
index cb05c6fb..69309e00 100644
--- a/lib/sockopt.h
+++ b/lib/sockopt.h
@@ -82,13 +82,11 @@ extern int setsockopt_ipv6_multicast_loop (int, int);
(((af) == AF_INET) : SOPT_SIZE_CMSG_IFINDEX_IPV4() \
? SOPT_SIZE_CMSG_PKTINFO_IPV6())
-extern int setsockopt_multicast_ipv4(int sock, int optname,
- struct in_addr if_addr
- /* required: interface to join on */,
+extern int setsockopt_ipv4_multicast_if(int sock,
+ unsigned int ifindex);
+extern int setsockopt_ipv4_multicast(int sock, int optname,
unsigned int mcast_addr,
- unsigned int ifindex
- /* optional: if non-zero, may be used
- instead of if_addr */);
+ unsigned int ifindex);
extern int setsockopt_ipv4_tos(int sock, int tos);
/* Ask for, and get, ifindex, by whatever method is supported. */