diff options
Diffstat (limited to 'sys/netinet/in.c')
| -rw-r--r-- | sys/netinet/in.c | 132 |
1 files changed, 131 insertions, 1 deletions
diff --git a/sys/netinet/in.c b/sys/netinet/in.c index 2c662e2d6336..46f423b71bbd 100644 --- a/sys/netinet/in.c +++ b/sys/netinet/in.c @@ -31,7 +31,7 @@ * SUCH DAMAGE. * * from: @(#)in.c 7.17 (Berkeley) 4/20/91 - * $Id: in.c,v 1.8 1994/01/15 14:29:21 davidg Exp $ + * $Id: in.c,v 1.9 1994/05/17 22:31:03 jkh Exp $ */ #include "param.h" @@ -93,6 +93,10 @@ in_netof(in) net = i & IN_CLASSB_NET; else if (IN_CLASSC(i)) net = i & IN_CLASSC_NET; +#ifdef MULTICAST + else if (IN_CLASSD(i)) + net = i & IN_CLASSD_NET; +#endif else return (0); @@ -174,6 +178,11 @@ in_lnaof(in) } else if (IN_CLASSC(i)) { net = i & IN_CLASSC_NET; host = i & IN_CLASSC_HOST; +#ifdef MULTICAST + } else if (IN_CLASSD(i)) { + net = i & IN_CLASSD_NET; + host = i & IN_CLASSD_HOST; +#endif } else return (i); @@ -557,6 +566,18 @@ in_ifinit(ifp, ia, sin, scrub) } if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) ia->ia_flags |= IFA_ROUTE; +#ifdef MULTICAST + /* + * If the interface supports multicast, join the "all hosts" + * multicast group on that interface. + */ + if (ifp->if_flags & IFF_MULTICAST) { + struct in_addr addr; + + addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); + in_addmulti(&addr, ifp); + } +#endif return (error); } @@ -603,4 +624,113 @@ in_broadcast(in) return (1); return (0); } + +#ifdef MULTICAST +/* + * Add an address to the list of IP multicast addresses for a given interface. + */ +struct in_multi * +in_addmulti(ap, ifp) + register struct in_addr *ap; + register struct ifnet *ifp; +{ + register struct in_multi *inm; + struct ifreq ifr; + struct in_ifaddr *ia; + int s = splnet(); + + /* + * See if address already in list. + */ + IN_LOOKUP_MULTI(*ap, ifp, inm); + if (inm != NULL) { + /* + * Found it; just increment the reference count. + */ + ++inm->inm_refcount; + } + else { + /* + * New address; allocate a new multicast record + * and link it into the interface's multicast list. + */ + inm = (struct in_multi *)malloc(sizeof(*inm), + M_IPMADDR, M_NOWAIT); + if (inm == NULL) { + splx(s); + return (NULL); + } + inm->inm_addr = *ap; + inm->inm_ifp = ifp; + inm->inm_refcount = 1; + IFP_TO_IA(ifp, ia); + if (ia == NULL) { + free(inm, M_IPMADDR); + splx(s); + return (NULL); + } + inm->inm_ia = ia; + inm->inm_next = ia->ia_multiaddrs; + ia->ia_multiaddrs = inm; + /* + * Ask the network driver to update its multicast reception + * filter appropriately for the new address. + */ + ((struct sockaddr_in *)&ifr.ifr_addr)->sin_family = AF_INET; + ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr = *ap; + if (ifp->if_ioctl == NULL || + (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) { + ia->ia_multiaddrs = inm->inm_next; + free(inm, M_IPMADDR); + splx(s); + return (NULL); + } + /* + * Let IGMP know that we have joined a new IP multicast group. + */ + igmp_joingroup(inm); + } + splx(s); + return (inm); +} + +/* + * Delete a multicast address record. + */ +int +in_delmulti(inm) + register struct in_multi *inm; +{ + register struct in_multi **p; + struct ifreq ifr; + int s = splnet(); + + if (--inm->inm_refcount == 0) { + /* + * No remaining claims to this record; let IGMP know that + * we are leaving the multicast group. + */ + igmp_leavegroup(inm); + /* + * Unlink from list. + */ + for (p = &inm->inm_ia->ia_multiaddrs; + *p != inm; + p = &(*p)->inm_next) + continue; + *p = (*p)->inm_next; + /* + * Notify the network driver to update its multicast reception + * filter. + */ + ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; + ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr = + inm->inm_addr; + (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI, + (caddr_t)&ifr); + free(inm, M_IPMADDR); + } + splx(s); +} +#endif #endif |