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lib: simplify interface of setsockopt_multicast_ipv4().

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* 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
This commit is contained in:
Dmitrij Tejblum 2011-08-18 20:22:17 +04:00
parent 9fa6be78ec
commit bf510e9bc0
4 changed files with 63 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
lib/sockopt.c
View File

@ -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)
{

10
lib/sockopt.h
View File

@ -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. */

19
ospfd/ospf_network.c
View File

@ -52,8 +52,8 @@ ospf_if_add_allspfrouters (struct ospf *top, struct prefix *p,
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),
ret = setsockopt_ipv4_multicast (top->fd, IP_ADD_MEMBERSHIP,
htonl (OSPF_ALLSPFROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
@ -73,8 +73,8 @@ ospf_if_drop_allspfrouters (struct ospf *top, struct prefix *p,
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),
ret = setsockopt_ipv4_multicast (top->fd, IP_DROP_MEMBERSHIP,
htonl (OSPF_ALLSPFROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
@ -94,8 +94,8 @@ ospf_if_add_alldrouters (struct ospf *top, struct prefix *p, unsigned int
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLDROUTERS),
ret = setsockopt_ipv4_multicast (top->fd, IP_ADD_MEMBERSHIP,
htonl (OSPF_ALLDROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
@ -115,8 +115,8 @@ ospf_if_drop_alldrouters (struct ospf *top, struct prefix *p, unsigned int
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLDROUTERS),
ret = setsockopt_ipv4_multicast (top->fd, IP_DROP_MEMBERSHIP,
htonl (OSPF_ALLDROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
@ -151,8 +151,7 @@ ospf_if_ipmulticast (struct ospf *top, struct prefix *p, unsigned int ifindex)
zlog_warn ("can't setsockopt IP_MULTICAST_TTL(1) for fd %d: %s",
top->fd, safe_strerror (errno));
ret = setsockopt_multicast_ipv4 (top->fd, IP_MULTICAST_IF,
p->u.prefix4, 0, ifindex);
ret = setsockopt_ipv4_multicast_if (top->fd, ifindex);
if (ret < 0)
zlog_warn("can't setsockopt IP_MULTICAST_IF(fd %d, addr %s, "
"ifindex %u): %s",

17
ripd/rip_interface.c
View File

@ -78,9 +78,8 @@ ipv4_multicast_join (int sock,
{
int ret;
ret = setsockopt_multicast_ipv4 (sock,
ret = setsockopt_ipv4_multicast (sock,
IP_ADD_MEMBERSHIP,
ifa,
group.s_addr,
ifindex);
@ -100,9 +99,8 @@ ipv4_multicast_leave (int sock,
{
int ret;
ret = setsockopt_multicast_ipv4 (sock,
ret = setsockopt_ipv4_multicast (sock,
IP_DROP_MEMBERSHIP,
ifa,
group.s_addr,
ifindex);
@ -138,18 +136,13 @@ rip_interface_new (void)
void
rip_interface_multicast_set (int sock, struct connected *connected)
{
struct in_addr addr;
assert (connected != NULL);
addr = CONNECTED_ID(connected)->u.prefix4;
if (setsockopt_multicast_ipv4 (sock, IP_MULTICAST_IF, addr, 0,
connected->ifp->ifindex) < 0)
if (setsockopt_ipv4_multicast_if (sock, connected->ifp->ifindex) < 0)
{
zlog_warn ("Can't setsockopt IP_MULTICAST_IF on fd %d to "
"source address %s for interface %s",
sock, inet_ntoa(addr),
"ifindex %d for interface %s",
sock, connected->ifp->ifindex,
connected->ifp->name);
}