[src/trunk]: src/sys/netinet provide net.inet.multicast, like we have net.ine...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ea26aabe8a65
branches:  trunk
changeset: 346480:ea26aabe8a65
user:      christos <christos%NetBSD.org@localhost>
date:      Thu Jul 14 18:18:16 2016 +0000

description:
provide net.inet.multicast, like we have net.inet6.multicast to be used
by netstat.

diffstat:

 sys/netinet/in.c |  86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 84 insertions(+), 2 deletions(-)

diffs (114 lines):

diff -r 8be5f0720500 -r ea26aabe8a65 sys/netinet/in.c
--- a/sys/netinet/in.c  Thu Jul 14 18:16:51 2016 +0000
+++ b/sys/netinet/in.c  Thu Jul 14 18:18:16 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: in.c,v 1.174 2016/07/13 03:19:29 ozaki-r Exp $ */
+/*     $NetBSD: in.c,v 1.175 2016/07/14 18:18:16 christos Exp $        */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -91,7 +91,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: in.c,v 1.174 2016/07/13 03:19:29 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: in.c,v 1.175 2016/07/14 18:18:16 christos Exp $");
 
 #include "arp.h"
 
@@ -1921,6 +1921,82 @@
 
 #endif /* NARP > 0 */
 
+static int
+in_multicast_sysctl(SYSCTLFN_ARGS)
+{
+       struct ifnet *ifp;
+       struct ifaddr *ifa;
+       struct in_ifaddr *ifa4;
+       struct in_multi *inm;
+       uint32_t tmp;
+       int error;
+       size_t written;
+       struct psref psref;
+       int bound;
+
+       if (namelen != 1)
+               return EINVAL;
+
+       bound = curlwp_bind();
+       ifp = if_get_byindex(name[0], &psref);
+       if (ifp == NULL) {
+               curlwp_bindx(bound);
+               return ENODEV;
+       }
+
+       if (oldp == NULL) {
+               *oldlenp = 0;
+               IFADDR_FOREACH(ifa, ifp) {
+                       if (ifa->ifa_addr->sa_family != AF_INET)
+                               continue;
+                       ifa4 = (void *)ifa;
+                       LIST_FOREACH(inm, &ifa4->ia_multiaddrs, inm_list) {
+                               *oldlenp += 2 * sizeof(struct in_addr) +
+                                   sizeof(uint32_t);
+                       }
+               }
+               if_put(ifp, &psref);
+               curlwp_bindx(bound);
+               return 0;
+       }
+
+       error = 0;
+       written = 0;
+       IFADDR_FOREACH(ifa, ifp) {
+               if (ifa->ifa_addr->sa_family != AF_INET)
+                       continue;
+               ifa4 = (void *)ifa;
+               LIST_FOREACH(inm, &ifa4->ia_multiaddrs, inm_list) {
+                       if (written + 2 * sizeof(struct in_addr) +
+                           sizeof(uint32_t) > *oldlenp)
+                               goto done;
+                       error = sysctl_copyout(l, &ifa4->ia_addr.sin_addr,
+                           oldp, sizeof(struct in_addr));
+                       if (error)
+                               goto done;
+                       oldp = (char *)oldp + sizeof(struct in_addr);
+                       written += sizeof(struct in_addr);
+                       error = sysctl_copyout(l, &inm->inm_addr,
+                           oldp, sizeof(struct in_addr));
+                       if (error)
+                               goto done;
+                       oldp = (char *)oldp + sizeof(struct in_addr);
+                       written += sizeof(struct in_addr);
+                       tmp = inm->inm_refcount;
+                       error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
+                       if (error)
+                               goto done;
+                       oldp = (char *)oldp + sizeof(tmp);
+                       written += sizeof(tmp);
+               }
+       }
+done:
+       if_put(ifp, &psref);
+       curlwp_bindx(bound);
+       *oldlenp = written;
+       return error;
+}
+
 static void
 in_sysctl_init(struct sysctllog **clog)
 {
@@ -1932,6 +2008,12 @@
                       CTL_NET, PF_INET, CTL_EOL);
        sysctl_createv(clog, 0, NULL, NULL,
                       CTLFLAG_PERMANENT,
+                      CTLTYPE_NODE, "multicast",
+                      SYSCTL_DESCR("Multicast information"),
+                      in_multicast_sysctl, 0, NULL, 0,
+                      CTL_NET, PF_INET, CTL_CREATE, CTL_EOL);
+       sysctl_createv(clog, 0, NULL, NULL,
+                      CTLFLAG_PERMANENT,
                       CTLTYPE_NODE, "ip",
                       SYSCTL_DESCR("IPv4 related settings"),
                       NULL, 0, NULL, 0,