diff options
Diffstat (limited to 'sys/net/if.c')
| -rw-r--r-- | sys/net/if.c | 180 |
1 files changed, 179 insertions, 1 deletions
diff --git a/sys/net/if.c b/sys/net/if.c index 65ec137..e523df8 100644 --- a/sys/net/if.c +++ b/sys/net/if.c @@ -31,7 +31,7 @@ * SUCH DAMAGE. * * @(#)if.c 8.3 (Berkeley) 1/4/94 - * $Id: if.c,v 1.37 1996/12/11 20:38:14 wollman Exp $ + * $Id: if.c,v 1.38 1996/12/13 21:28:37 wollman Exp $ */ #include <sys/param.h> @@ -125,6 +125,7 @@ if_attach(ifp) * this unlikely case. */ TAILQ_INIT(&ifp->if_addrhead); + LIST_INIT(&ifp->if_multiaddrs); microtime(&ifp->if_lastchange); if (ifnet_addrs == 0 || if_index >= if_indexlim) { unsigned n = (if_indexlim <<= 1) * sizeof(ifa); @@ -758,5 +759,182 @@ ifconf(cmd, data) return (error); } +/* + * Just like if_promisc(), but for all-multicast-reception mode. + */ +int +if_allmulti(ifp, onswitch) + struct ifnet *ifp; + int onswitch; +{ + int error = 0; + int s = splimp(); + + if (onswitch) { + if (ifp->if_amcount++ == 0) { + ifp->if_flags |= IFF_ALLMULTI; + error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0); + } + } else { + if (ifp->if_amcount > 1) { + ifp->if_amcount--; + } else { + ifp->if_amcount = 0; + ifp->if_flags &= ~IFF_ALLMULTI; + error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0); + } + } + splx(s); + return error; +} + +/* + * Add a multicast listenership to the interface in question. + * The link layer provides a routine which converts + */ +int +if_addmulti(ifp, sa) + struct ifnet *ifp; /* interface to manipulate */ + struct sockaddr *sa; /* address to add */ +{ + struct sockaddr *llsa, *dupsa; + int error, s; + struct ifmultiaddr *ifma; + + for (ifma = ifp->if_multiaddrs.lh_first; ifma; + ifma = ifma->ifma_link.le_next) { + if (equal(sa, ifma->ifma_addr)) + break; + } + + if (ifma) { + ifma->ifma_refcount++; + return 0; + } + + /* + * Give the link layer a chance to accept/reject it, and also + * find out which AF_LINK address this maps to, if it isn't one + * already. + */ + if (ifp->if_resolvemulti) { + error = ifp->if_resolvemulti(ifp, &llsa, sa); + if (error) return error; + } else { + llsa = 0; + } + + MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); + MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); + bcopy(sa, dupsa, sa->sa_len); + + ifma->ifma_addr = dupsa; + ifma->ifma_lladdr = llsa; + ifma->ifma_ifp = ifp; + ifma->ifma_refcount = 1; + /* + * Some network interfaces can scan the address list at + * interrupt time; lock them out. + */ + s = splimp(); + LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); + splx(s); + + if (llsa != 0) { + for (ifma = ifp->if_multiaddrs.lh_first; ifma; + ifma = ifma->ifma_link.le_next) { + if (equal(ifma->ifma_addr, llsa)) + break; + } + if (ifma) { + ifma->ifma_refcount++; + } else { + MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, + M_IFMADDR, M_WAITOK); + ifma->ifma_addr = llsa; + ifma->ifma_ifp = ifp; + ifma->ifma_refcount = 1; + } + s = splimp(); + LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); + splx(s); + } + /* + * We are certain we have added something, so call down to the + * interface to let them know about it. + */ + s = splimp(); + ifp->if_ioctl(ifp, SIOCADDMULTI, 0); + splx(s); + + return 0; +} + +/* + * Remove a reference to a multicast address on this interface. Yell + * if the request does not match an existing membership. + */ +int +if_delmulti(ifp, sa) + struct ifnet *ifp; + struct sockaddr *sa; +{ + struct ifmultiaddr *ifma; + int s; + + for (ifma = ifp->if_multiaddrs.lh_first; ifma; + ifma = ifma->ifma_link.le_next) + if (equal(sa, ifma->ifma_addr)) + break; + if (ifma == 0) + return ENOENT; + + if (ifma->ifma_refcount > 1) { + ifma->ifma_refcount--; + return 0; + } + + sa = ifma->ifma_lladdr; + s = splimp(); + LIST_REMOVE(ifma, ifma_link); + splx(s); + free(ifma->ifma_addr, M_IFMADDR); + free(ifma, M_IFMADDR); + if (sa == 0) + return 0; + + /* + * Now look for the link-layer address which corresponds to + * this network address. It had been squirreled away in + * ifma->ifma_lladdr for this purpose (so we don't have + * to call ifp->if_resolvemulti() again), and we saved that + * value in sa above. If some nasty deleted the + * link-layer address out from underneath us, we can deal because + * the address we stored was is not the same as the one which was + * in the record for the link-layer address. (So we don't complain + * in that case.) + */ + for (ifma = ifp->if_multiaddrs.lh_first; ifma; + ifma = ifma->ifma_link.le_next) + if (equal(sa, ifma->ifma_addr)) + break; + if (ifma == 0) + return 0; + + if (ifma->ifma_refcount > 1) { + ifma->ifma_refcount--; + return 0; + } + + s = splimp(); + LIST_REMOVE(ifma, ifma_link); + splx(s); + free(ifma->ifma_addr, M_IFMADDR); + free(sa, M_IFMADDR); + free(ifma, M_IFMADDR); + + return 0; +} + SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); |
