| /*- |
| * Copyright (c) 2007-2009 Bruce Simpson. |
| * Copyright (c) 2005 Robert N. M. Watson. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote |
| * products derived from this software without specific prior written |
| * permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| /* |
| * IPv4 multicast socket, group, and socket option processing module. |
| */ |
| |
| #include <sys/bsd_cdefs.h> |
| //__FBSDID("$FreeBSD$"); |
| |
| #include <sys/bsd_param.h> |
| #include <sys/bsd_systm.h> |
| #include <sys/bsd_kernel.h> |
| #include <sys/bsd_malloc.h> |
| #include <sys/bsd_mbuf.h> |
| #include <sys/bsd_protosw.h> |
| #include <sys/bsd_socket.h> |
| #include <sys/bsd_socketvar.h> |
| #include <sys/bsd_protosw.h> |
| //baoyg//#include <sys/bsd_sysctl.h> |
| #include <sys/bsd_ktr.h> |
| #include <sys/bsd_tree.h> |
| |
| #include <net/bsd_if.h> |
| #include <net/bsd_if_dl.h> |
| #include <net/bsd_route.h> |
| #include <net/bsd_vnet.h> |
| |
| #include <netinet/bsd_in.h> |
| #include <netinet/bsd_in_systm.h> |
| #include <netinet/bsd_in_pcb.h> |
| #include <netinet/bsd_in_var.h> |
| #include <netinet/bsd_ip_var.h> |
| #include <netinet/bsd_igmp_var.h> |
| |
| #ifndef KTR_IGMPV3 |
| #define KTR_IGMPV3 KTR_INET |
| #endif |
| |
| #ifndef __SOCKUNION_DECLARED |
| union sockunion { |
| struct sockaddr_storage ss; |
| struct sockaddr sa; |
| struct sockaddr_dl sdl; |
| struct sockaddr_in sin; |
| }; |
| typedef union sockunion sockunion_t; |
| #define __SOCKUNION_DECLARED |
| #endif /* __SOCKUNION_DECLARED */ |
| |
| static MALLOC_DEFINE(M_INMFILTER, "in_mfilter", |
| "IPv4 multicast PCB-layer source filter"); |
| static MALLOC_DEFINE(M_IPMADDR, "in_multi", "IPv4 multicast group"); |
| static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "IPv4 multicast options"); |
| static MALLOC_DEFINE(M_IPMSOURCE, "ip_msource", |
| "IPv4 multicast IGMP-layer source filter"); |
| |
| /* |
| * Locking: |
| * - Lock order is: Giant, INP_WLOCK, IN_MULTI_LOCK, IGMP_LOCK, IF_ADDR_LOCK. |
| * - The IF_ADDR_LOCK is implicitly taken by inm_lookup() earlier, however |
| * it can be taken by code in net/if.c also. |
| * - ip_moptions and in_mfilter are covered by the INP_WLOCK. |
| * |
| * struct in_multi is covered by IN_MULTI_LOCK. There isn't strictly |
| * any need for in_multi itself to be virtualized -- it is bound to an ifp |
| * anyway no matter what happens. |
| */ |
| struct mtx in_multi_mtx; |
| MTX_SYSINIT(in_multi_mtx, &in_multi_mtx, "in_multi_mtx", MTX_DEF); |
| |
| /* |
| * Functions with non-static linkage defined in this file should be |
| * declared in in_var.h: |
| * imo_multi_filter() |
| * in_addmulti() |
| * in_delmulti() |
| * in_joingroup() |
| * in_joingroup_locked() |
| * in_leavegroup() |
| * in_leavegroup_locked() |
| * and ip_var.h: |
| * inp_freemoptions() |
| * inp_getmoptions() |
| * inp_setmoptions() |
| * |
| * XXX: Both carp and pf need to use the legacy (*,G) KPIs in_addmulti() |
| * and in_delmulti(). |
| */ |
| static void imf_commit(struct in_mfilter *); |
| static int imf_get_source(struct in_mfilter *imf, |
| const struct sockaddr_in *psin, |
| struct in_msource **); |
| static struct in_msource * |
| imf_graft(struct in_mfilter *, const uint8_t, |
| const struct sockaddr_in *); |
| static void imf_leave(struct in_mfilter *); |
| static int imf_prune(struct in_mfilter *, const struct sockaddr_in *); |
| static void imf_purge(struct in_mfilter *); |
| static void imf_rollback(struct in_mfilter *); |
| static void imf_reap(struct in_mfilter *); |
| static int imo_grow(struct ip_moptions *); |
| static size_t imo_match_group(const struct ip_moptions *, |
| const struct ifnet *, const struct sockaddr *); |
| static struct in_msource * |
| imo_match_source(const struct ip_moptions *, const size_t, |
| const struct sockaddr *); |
| static void ims_merge(struct ip_msource *ims, |
| const struct in_msource *lims, const int rollback); |
| static int in_getmulti(struct ifnet *, const struct in_addr *, |
| struct in_multi **); |
| static int inm_get_source(struct in_multi *inm, const in_addr_t haddr, |
| const int noalloc, struct ip_msource **pims); |
| static int inm_is_ifp_detached(const struct in_multi *); |
| static int inm_merge(struct in_multi *, /*const*/ struct in_mfilter *); |
| static void inm_purge(struct in_multi *); |
| static void inm_reap(struct in_multi *); |
| static struct ip_moptions * |
| inp_findmoptions(struct inpcb *); |
| static int inp_get_source_filters(struct inpcb *, struct sockopt *); |
| static int inp_join_group(struct inpcb *, struct sockopt *); |
| static int inp_leave_group(struct inpcb *, struct sockopt *); |
| static struct ifnet * |
| inp_lookup_mcast_ifp(const struct inpcb *, |
| const struct sockaddr_in *, const struct in_addr); |
| static int inp_block_unblock_source(struct inpcb *, struct sockopt *); |
| static int inp_set_multicast_if(struct inpcb *, struct sockopt *); |
| static int inp_set_source_filters(struct inpcb *, struct sockopt *); |
| //baoygstatic int sysctl_ip_mcast_filters(SYSCTL_HANDLER_ARGS); |
| |
| //SYSCTL_NODE(_net_inet_ip, OID_AUTO, mcast, CTLFLAG_RW, 0, "IPv4 multicast"); |
| |
| static u_long in_mcast_maxgrpsrc = IP_MAX_GROUP_SRC_FILTER; |
| /*SYSCTL_ULONG(_net_inet_ip_mcast, OID_AUTO, maxgrpsrc, |
| CTLFLAG_RW | CTLFLAG_TUN, &in_mcast_maxgrpsrc, 0, |
| "Max source filters per group"); |
| TUNABLE_ULONG("net.inet.ip.mcast.maxgrpsrc", &in_mcast_maxgrpsrc); |
| */ |
| static u_long in_mcast_maxsocksrc = IP_MAX_SOCK_SRC_FILTER; |
| /*SYSCTL_ULONG(_net_inet_ip_mcast, OID_AUTO, maxsocksrc, |
| CTLFLAG_RW | CTLFLAG_TUN, &in_mcast_maxsocksrc, 0, |
| "Max source filters per socket"); |
| TUNABLE_ULONG("net.inet.ip.mcast.maxsocksrc", &in_mcast_maxsocksrc); |
| */ |
| int in_mcast_loop = IP_DEFAULT_MULTICAST_LOOP; |
| /*SYSCTL_INT(_net_inet_ip_mcast, OID_AUTO, loop, CTLFLAG_RW | CTLFLAG_TUN, |
| &in_mcast_loop, 0, "Loopback multicast datagrams by default"); |
| TUNABLE_INT("net.inet.ip.mcast.loop", &in_mcast_loop); |
| |
| SYSCTL_NODE(_net_inet_ip_mcast, OID_AUTO, filters, |
| CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ip_mcast_filters, |
| "Per-interface stack-wide source filters"); |
| */ |
| /* |
| * Inline function which wraps assertions for a valid ifp. |
| * The ifnet layer will set the ifma's ifp pointer to NULL if the ifp |
| * is detached. |
| */ |
| static int __inline |
| inm_is_ifp_detached(const struct in_multi *inm) |
| { |
| struct ifnet *ifp; |
| |
| KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); |
| ifp = inm->inm_ifma->ifma_ifp; |
| if (ifp != NULL) { |
| /* |
| * Sanity check that netinet's notion of ifp is the |
| * same as net's. |
| */ |
| KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); |
| } |
| |
| return (ifp == NULL); |
| } |
| |
| /* |
| * Initialize an in_mfilter structure to a known state at t0, t1 |
| * with an empty source filter list. |
| */ |
| static __inline void |
| imf_init(struct in_mfilter *imf, const int st0, const int st1) |
| { |
| memset(imf, 0, sizeof(struct in_mfilter)); |
| RB_INIT(&imf->imf_sources); |
| imf->imf_st[0] = st0; |
| imf->imf_st[1] = st1; |
| } |
| |
| /* |
| * Resize the ip_moptions vector to the next power-of-two minus 1. |
| * May be called with locks held; do not sleep. |
| */ |
| static int |
| imo_grow(struct ip_moptions *imo) |
| { |
| struct in_multi **nmships; |
| struct in_multi **omships; |
| struct in_mfilter *nmfilters; |
| struct in_mfilter *omfilters; |
| size_t idx; |
| size_t newmax; |
| size_t oldmax; |
| |
| nmships = NULL; |
| nmfilters = NULL; |
| omships = imo->imo_membership; |
| omfilters = imo->imo_mfilters; |
| oldmax = imo->imo_max_memberships; |
| newmax = ((oldmax + 1) * 2) - 1; |
| |
| if (newmax <= IP_MAX_MEMBERSHIPS) { |
| nmships = (struct in_multi **)bsd_realloc(omships, |
| sizeof(struct in_multi *) * newmax, M_IPMOPTS, M_NOWAIT); |
| nmfilters = (struct in_mfilter *)bsd_realloc(omfilters, |
| sizeof(struct in_mfilter) * newmax, M_INMFILTER, M_NOWAIT); |
| if (nmships != NULL && nmfilters != NULL) { |
| /* Initialize newly allocated source filter heads. */ |
| for (idx = oldmax; idx < newmax; idx++) { |
| imf_init(&nmfilters[idx], MCAST_UNDEFINED, |
| MCAST_EXCLUDE); |
| } |
| imo->imo_max_memberships = newmax; |
| imo->imo_membership = nmships; |
| imo->imo_mfilters = nmfilters; |
| } |
| } |
| |
| if (nmships == NULL || nmfilters == NULL) { |
| if (nmships != NULL) |
| bsd_free(nmships, M_IPMOPTS); |
| if (nmfilters != NULL) |
| bsd_free(nmfilters, M_INMFILTER); |
| return (ETOOMANYREFS); |
| } |
| |
| return (0); |
| } |
| |
| /* |
| * Find an IPv4 multicast group entry for this ip_moptions instance |
| * which matches the specified group, and optionally an interface. |
| * Return its index into the array, or -1 if not found. |
| */ |
| static size_t |
| imo_match_group(const struct ip_moptions *imo, const struct ifnet *ifp, |
| const struct sockaddr *group) |
| { |
| const struct sockaddr_in *gsin; |
| struct in_multi **pinm; |
| int idx; |
| int nmships; |
| |
| gsin = (const struct sockaddr_in *)group; |
| |
| /* The imo_membership array may be lazy allocated. */ |
| if (imo->imo_membership == NULL || imo->imo_num_memberships == 0) |
| return (-1); |
| |
| nmships = imo->imo_num_memberships; |
| pinm = &imo->imo_membership[0]; |
| for (idx = 0; idx < nmships; idx++, pinm++) { |
| if (*pinm == NULL) |
| continue; |
| if ((ifp == NULL || ((*pinm)->inm_ifp == ifp)) && |
| in_hosteq((*pinm)->inm_addr, gsin->sin_addr)) { |
| break; |
| } |
| } |
| if (idx >= nmships) |
| idx = -1; |
| |
| return (idx); |
| } |
| |
| /* |
| * Find an IPv4 multicast source entry for this imo which matches |
| * the given group index for this socket, and source address. |
| * |
| * NOTE: This does not check if the entry is in-mode, merely if |
| * it exists, which may not be the desired behaviour. |
| */ |
| static struct in_msource * |
| imo_match_source(const struct ip_moptions *imo, const size_t gidx, |
| const struct sockaddr *src) |
| { |
| struct ip_msource find; |
| struct in_mfilter *imf; |
| struct ip_msource *ims; |
| const sockunion_t *psa; |
| |
| KASSERT(src->sa_family == AF_INET, ("%s: !AF_INET", __func__)); |
| KASSERT(gidx != -1 && gidx < imo->imo_num_memberships, |
| ("%s: invalid index %d\n", __func__, (int)gidx)); |
| |
| /* The imo_mfilters array may be lazy allocated. */ |
| if (imo->imo_mfilters == NULL) |
| return (NULL); |
| imf = &imo->imo_mfilters[gidx]; |
| |
| /* Source trees are keyed in host byte order. */ |
| psa = (const sockunion_t *)src; |
| find.ims_haddr = ntohl(psa->sin.sin_addr.s_addr); |
| ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find); |
| |
| return ((struct in_msource *)ims); |
| } |
| |
| /* |
| * Perform filtering for multicast datagrams on a socket by group and source. |
| * |
| * Returns 0 if a datagram should be allowed through, or various error codes |
| * if the socket was not a member of the group, or the source was muted, etc. |
| */ |
| int |
| imo_multi_filter(const struct ip_moptions *imo, const struct ifnet *ifp, |
| const struct sockaddr *group, const struct sockaddr *src) |
| { |
| size_t gidx; |
| struct in_msource *ims; |
| int mode; |
| |
| KASSERT(ifp != NULL, ("%s: null ifp", __func__)); |
| |
| gidx = imo_match_group(imo, ifp, group); |
| if (gidx == -1) |
| return (MCAST_NOTGMEMBER); |
| |
| /* |
| * Check if the source was included in an (S,G) join. |
| * Allow reception on exclusive memberships by default, |
| * reject reception on inclusive memberships by default. |
| * Exclude source only if an in-mode exclude filter exists. |
| * Include source only if an in-mode include filter exists. |
| * NOTE: We are comparing group state here at IGMP t1 (now) |
| * with socket-layer t0 (since last downcall). |
| */ |
| mode = imo->imo_mfilters[gidx].imf_st[1]; |
| ims = imo_match_source(imo, gidx, src); |
| |
| if ((ims == NULL && mode == MCAST_INCLUDE) || |
| (ims != NULL && ims->imsl_st[0] != mode)) |
| return (MCAST_NOTSMEMBER); |
| |
| return (MCAST_PASS); |
| } |
| |
| /* |
| * Find and return a reference to an in_multi record for (ifp, group), |
| * and bump its reference count. |
| * If one does not exist, try to allocate it, and update link-layer multicast |
| * filters on ifp to listen for group. |
| * Assumes the IN_MULTI lock is held across the call. |
| * Return 0 if successful, otherwise return an appropriate error code. |
| */ |
| static int |
| in_getmulti(struct ifnet *ifp, const struct in_addr *group, |
| struct in_multi **pinm) |
| { |
| struct sockaddr_in gsin; |
| struct ifmultiaddr *ifma; |
| struct in_ifinfo *ii; |
| struct in_multi *inm; |
| int error; |
| |
| IN_MULTI_LOCK_ASSERT(); |
| |
| ii = (struct in_ifinfo *)ifp->if_afdata[AF_INET]; |
| |
| inm = inm_lookup(ifp, *group); |
| if (inm != NULL) { |
| /* |
| * If we already joined this group, just bump the |
| * refcount and return it. |
| */ |
| KASSERT(inm->inm_refcount >= 1, |
| ("%s: bad refcount %d", __func__, inm->inm_refcount)); |
| ++inm->inm_refcount; |
| *pinm = inm; |
| return (0); |
| } |
| |
| memset(&gsin, 0, sizeof(gsin)); |
| gsin.sin_family = AF_INET; |
| gsin.sin_len = sizeof(struct sockaddr_in); |
| gsin.sin_addr = *group; |
| |
| /* |
| * Check if a link-layer group is already associated |
| * with this network-layer group on the given ifnet. |
| */ |
| error = if_addmulti(ifp, (struct sockaddr *)&gsin, &ifma); |
| if (error != 0) |
| return (error); |
| |
| /* XXX ifma_protospec must be covered by IF_ADDR_LOCK */ |
| IF_ADDR_LOCK(ifp); |
| |
| /* |
| * If something other than netinet is occupying the link-layer |
| * group, print a meaningful error message and back out of |
| * the allocation. |
| * Otherwise, bump the refcount on the existing network-layer |
| * group association and return it. |
| */ |
| if (ifma->ifma_protospec != NULL) { |
| inm = (struct in_multi *)ifma->ifma_protospec; |
| #ifdef INVARIANTS |
| KASSERT(ifma->ifma_addr != NULL, ("%s: no ifma_addr", |
| __func__)); |
| KASSERT(ifma->ifma_addr->sa_family == AF_INET, |
| ("%s: ifma not AF_INET", __func__)); |
| KASSERT(inm != NULL, ("%s: no ifma_protospec", __func__)); |
| if (inm->inm_ifma != ifma || inm->inm_ifp != ifp || |
| !in_hosteq(inm->inm_addr, *group)) |
| panic("%s: ifma %p is inconsistent with %p (%s)", |
| __func__, ifma, inm, inet_ntoa(*group)); |
| #endif |
| ++inm->inm_refcount; |
| *pinm = inm; |
| IF_ADDR_UNLOCK(ifp); |
| return (0); |
| } |
| |
| IF_ADDR_LOCK_ASSERT(ifp); |
| |
| /* |
| * A new in_multi record is needed; allocate and initialize it. |
| * We DO NOT perform an IGMP join as the in_ layer may need to |
| * push an initial source list down to IGMP to support SSM. |
| * |
| * The initial source filter state is INCLUDE, {} as per the RFC. |
| */ |
| inm = bsd_malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT | M_ZERO); |
| if (inm == NULL) { |
| if_delmulti_ifma(ifma); |
| IF_ADDR_UNLOCK(ifp); |
| return (ENOMEM); |
| } |
| inm->inm_addr = *group; |
| inm->inm_ifp = ifp; |
| inm->inm_igi = ii->ii_igmp; |
| inm->inm_ifma = ifma; |
| inm->inm_refcount = 1; |
| inm->inm_state = IGMP_NOT_MEMBER; |
| |
| /* |
| * Pending state-changes per group are subject to a bounds check. |
| */ |
| IFQ_SET_MAXLEN(&inm->inm_scq, IGMP_MAX_STATE_CHANGES); |
| |
| inm->inm_st[0].iss_fmode = MCAST_UNDEFINED; |
| inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; |
| RB_INIT(&inm->inm_srcs); |
| |
| ifma->ifma_protospec = inm; |
| |
| *pinm = inm; |
| |
| IF_ADDR_UNLOCK(ifp); |
| return (0); |
| } |
| |
| /* |
| * Drop a reference to an in_multi record. |
| * |
| * If the refcount drops to 0, free the in_multi record and |
| * delete the underlying link-layer membership. |
| */ |
| void |
| inm_release_locked(struct in_multi *inm) |
| { |
| struct ifmultiaddr *ifma; |
| |
| IN_MULTI_LOCK_ASSERT(); |
| |
| CTR2(KTR_IGMPV3, "%s: refcount is %d", __func__, inm->inm_refcount); |
| |
| if (--inm->inm_refcount > 0) { |
| CTR2(KTR_IGMPV3, "%s: refcount is now %d", __func__, |
| inm->inm_refcount); |
| return; |
| } |
| |
| CTR2(KTR_IGMPV3, "%s: freeing inm %p", __func__, inm); |
| |
| ifma = inm->inm_ifma; |
| |
| /* XXX this access is not covered by IF_ADDR_LOCK */ |
| CTR2(KTR_IGMPV3, "%s: purging ifma %p", __func__, ifma); |
| KASSERT(ifma->ifma_protospec == inm, |
| ("%s: ifma_protospec != inm", __func__)); |
| ifma->ifma_protospec = NULL; |
| |
| inm_purge(inm); |
| |
| bsd_free(inm, M_IPMADDR); |
| |
| if_delmulti_ifma(ifma); |
| } |
| |
| /* |
| * Clear recorded source entries for a group. |
| * Used by the IGMP code. Caller must hold the IN_MULTI lock. |
| * FIXME: Should reap. |
| */ |
| void |
| inm_clear_recorded(struct in_multi *inm) |
| { |
| struct ip_msource *ims; |
| |
| IN_MULTI_LOCK_ASSERT(); |
| |
| RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) { |
| if (ims->ims_stp) { |
| ims->ims_stp = 0; |
| --inm->inm_st[1].iss_rec; |
| } |
| } |
| KASSERT(inm->inm_st[1].iss_rec == 0, |
| ("%s: iss_rec %d not 0", __func__, inm->inm_st[1].iss_rec)); |
| } |
| |
| /* |
| * Record a source as pending for a Source-Group IGMPv3 query. |
| * This lives here as it modifies the shared tree. |
| * |
| * inm is the group descriptor. |
| * naddr is the address of the source to record in network-byte order. |
| * |
| * If the net.inet.igmp.sgalloc sysctl is non-zero, we will |
| * lazy-allocate a source node in response to an SG query. |
| * Otherwise, no allocation is performed. This saves some memory |
| * with the trade-off that the source will not be reported to the |
| * router if joined in the window between the query response and |
| * the group actually being joined on the local host. |
| * |
| * VIMAGE: XXX: Currently the igmp_sgalloc feature has been removed. |
| * This turns off the allocation of a recorded source entry if |
| * the group has not been joined. |
| * |
| * Return 0 if the source didn't exist or was already marked as recorded. |
| * Return 1 if the source was marked as recorded by this function. |
| * Return <0 if any error occured (negated errno code). |
| */ |
| int |
| inm_record_source(struct in_multi *inm, const in_addr_t naddr) |
| { |
| struct ip_msource find; |
| struct ip_msource *ims, *nims; |
| |
| IN_MULTI_LOCK_ASSERT(); |
| |
| find.ims_haddr = ntohl(naddr); |
| ims = RB_FIND(ip_msource_tree, &inm->inm_srcs, &find); |
| if (ims && ims->ims_stp) |
| return (0); |
| if (ims == NULL) { |
| if (inm->inm_nsrc == in_mcast_maxgrpsrc) |
| return (-ENOSPC); |
| nims = bsd_malloc(sizeof(struct ip_msource), M_IPMSOURCE, M_NOWAIT | M_ZERO); |
| if (nims == NULL) |
| return (-ENOMEM); |
| nims->ims_haddr = find.ims_haddr; |
| RB_INSERT(ip_msource_tree, &inm->inm_srcs, nims); |
| ++inm->inm_nsrc; |
| ims = nims; |
| } |
| |
| /* |
| * Mark the source as recorded and update the recorded |
| * source count. |
| */ |
| ++ims->ims_stp; |
| ++inm->inm_st[1].iss_rec; |
| |
| return (1); |
| } |
| |
| /* |
| * Return a pointer to an in_msource owned by an in_mfilter, |
| * given its source address. |
| * Lazy-allocate if needed. If this is a new entry its filter state is |
| * undefined at t0. |
| * |
| * imf is the filter set being modified. |
| * haddr is the source address in *host* byte-order. |
| * |
| * SMPng: May be called with locks held; malloc must not block. |
| */ |
| static int |
| imf_get_source(struct in_mfilter *imf, const struct sockaddr_in *psin, |
| struct in_msource **plims) |
| { |
| struct ip_msource find; |
| struct ip_msource *ims, *nims; |
| struct in_msource *lims; |
| int error; |
| |
| error = 0; |
| ims = NULL; |
| lims = NULL; |
| |
| /* key is host byte order */ |
| find.ims_haddr = ntohl(psin->sin_addr.s_addr); |
| ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find); |
| lims = (struct in_msource *)ims; |
| if (lims == NULL) { |
| if (imf->imf_nsrc == in_mcast_maxsocksrc) |
| return (ENOSPC); |
| nims = bsd_malloc(sizeof(struct in_msource), M_INMFILTER, M_NOWAIT | M_ZERO); |
| if (nims == NULL) |
| return (ENOMEM); |
| lims = (struct in_msource *)nims; |
| lims->ims_haddr = find.ims_haddr; |
| lims->imsl_st[0] = MCAST_UNDEFINED; |
| RB_INSERT(ip_msource_tree, &imf->imf_sources, nims); |
| ++imf->imf_nsrc; |
| } |
| |
| *plims = lims; |
| |
| return (error); |
| } |
| |
| /* |
| * Graft a source entry into an existing socket-layer filter set, |
| * maintaining any required invariants and checking allocations. |
| * |
| * The source is marked as being in the new filter mode at t1. |
| * |
| * Return the pointer to the new node, otherwise return NULL. |
| */ |
| static struct in_msource * |
| imf_graft(struct in_mfilter *imf, const uint8_t st1, |
| const struct sockaddr_in *psin) |
| { |
| struct ip_msource *nims; |
| struct in_msource *lims; |
| |
| nims = bsd_malloc(sizeof(struct in_msource), M_INMFILTER, M_NOWAIT | M_ZERO); |
| if (nims == NULL) |
| return (NULL); |
| lims = (struct in_msource *)nims; |
| lims->ims_haddr = ntohl(psin->sin_addr.s_addr); |
| lims->imsl_st[0] = MCAST_UNDEFINED; |
| lims->imsl_st[1] = st1; |
| RB_INSERT(ip_msource_tree, &imf->imf_sources, nims); |
| ++imf->imf_nsrc; |
| |
| return (lims); |
| } |
| |
| /* |
| * Prune a source entry from an existing socket-layer filter set, |
| * maintaining any required invariants and checking allocations. |
| * |
| * The source is marked as being left at t1, it is not freed. |
| * |
| * Return 0 if no error occurred, otherwise return an errno value. |
| */ |
| static int |
| imf_prune(struct in_mfilter *imf, const struct sockaddr_in *psin) |
| { |
| struct ip_msource find; |
| struct ip_msource *ims; |
| struct in_msource *lims; |
| |
| /* key is host byte order */ |
| find.ims_haddr = ntohl(psin->sin_addr.s_addr); |
| ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find); |
| if (ims == NULL) |
| return (ENOENT); |
| lims = (struct in_msource *)ims; |
| lims->imsl_st[1] = MCAST_UNDEFINED; |
| return (0); |
| } |
| |
| /* |
| * Revert socket-layer filter set deltas at t1 to t0 state. |
| */ |
| static void |
| imf_rollback(struct in_mfilter *imf) |
| { |
| struct ip_msource *ims, *tims; |
| struct in_msource *lims; |
| |
| RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) { |
| lims = (struct in_msource *)ims; |
| if (lims->imsl_st[0] == lims->imsl_st[1]) { |
| /* no change at t1 */ |
| continue; |
| } else if (lims->imsl_st[0] != MCAST_UNDEFINED) { |
| /* revert change to existing source at t1 */ |
| lims->imsl_st[1] = lims->imsl_st[0]; |
| } else { |
| /* revert source added t1 */ |
| CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims); |
| RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims); |
| bsd_free(ims, M_INMFILTER); |
| imf->imf_nsrc--; |
| } |
| } |
| imf->imf_st[1] = imf->imf_st[0]; |
| } |
| |
| /* |
| * Mark socket-layer filter set as INCLUDE {} at t1. |
| */ |
| static void |
| imf_leave(struct in_mfilter *imf) |
| { |
| struct ip_msource *ims; |
| struct in_msource *lims; |
| |
| RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) { |
| lims = (struct in_msource *)ims; |
| lims->imsl_st[1] = MCAST_UNDEFINED; |
| } |
| imf->imf_st[1] = MCAST_INCLUDE; |
| } |
| |
| /* |
| * Mark socket-layer filter set deltas as committed. |
| */ |
| static void |
| imf_commit(struct in_mfilter *imf) |
| { |
| struct ip_msource *ims; |
| struct in_msource *lims; |
| |
| RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) { |
| lims = (struct in_msource *)ims; |
| lims->imsl_st[0] = lims->imsl_st[1]; |
| } |
| imf->imf_st[0] = imf->imf_st[1]; |
| } |
| |
| /* |
| * Reap unreferenced sources from socket-layer filter set. |
| */ |
| static void |
| imf_reap(struct in_mfilter *imf) |
| { |
| struct ip_msource *ims, *tims; |
| struct in_msource *lims; |
| |
| RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) { |
| lims = (struct in_msource *)ims; |
| if ((lims->imsl_st[0] == MCAST_UNDEFINED) && |
| (lims->imsl_st[1] == MCAST_UNDEFINED)) { |
| CTR2(KTR_IGMPV3, "%s: free lims %p", __func__, ims); |
| RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims); |
| bsd_free(ims, M_INMFILTER); |
| imf->imf_nsrc--; |
| } |
| } |
| } |
| |
| /* |
| * Purge socket-layer filter set. |
| */ |
| static void |
| imf_purge(struct in_mfilter *imf) |
| { |
| struct ip_msource *ims, *tims; |
| |
| RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) { |
| CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims); |
| RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims); |
| bsd_free(ims, M_INMFILTER); |
| imf->imf_nsrc--; |
| } |
| imf->imf_st[0] = imf->imf_st[1] = MCAST_UNDEFINED; |
| KASSERT(RB_EMPTY(&imf->imf_sources), |
| ("%s: imf_sources not empty", __func__)); |
| } |
| |
| /* |
| * Look up a source filter entry for a multicast group. |
| * |
| * inm is the group descriptor to work with. |
| * haddr is the host-byte-order IPv4 address to look up. |
| * noalloc may be non-zero to suppress allocation of sources. |
| * *pims will be set to the address of the retrieved or allocated source. |
| * |
| * SMPng: NOTE: may be called with locks held. |
| * Return 0 if successful, otherwise return a non-zero error code. |
| */ |
| static int |
| inm_get_source(struct in_multi *inm, const in_addr_t haddr, |
| const int noalloc, struct ip_msource **pims) |
| { |
| struct ip_msource find; |
| struct ip_msource *ims, *nims; |
| #ifdef KTR |
| struct in_addr ia; |
| #endif |
| |
| find.ims_haddr = haddr; |
| ims = RB_FIND(ip_msource_tree, &inm->inm_srcs, &find); |
| if (ims == NULL && !noalloc) { |
| if (inm->inm_nsrc == in_mcast_maxgrpsrc) |
| return (ENOSPC); |
| nims = bsd_malloc(sizeof(struct ip_msource), M_IPMSOURCE, M_NOWAIT | M_ZERO); |
| if (nims == NULL) |
| return (ENOMEM); |
| nims->ims_haddr = haddr; |
| RB_INSERT(ip_msource_tree, &inm->inm_srcs, nims); |
| ++inm->inm_nsrc; |
| ims = nims; |
| #ifdef KTR |
| ia.s_addr = htonl(haddr); |
| CTR3(KTR_IGMPV3, "%s: allocated %s as %p", __func__, |
| inet_ntoa(ia), ims); |
| #endif |
| } |
| |
| *pims = ims; |
| return (0); |
| } |
| |
| /* |
| * Merge socket-layer source into IGMP-layer source. |
| * If rollback is non-zero, perform the inverse of the merge. |
| */ |
| static void |
| ims_merge(struct ip_msource *ims, const struct in_msource *lims, |
| const int rollback) |
| { |
| int n = rollback ? -1 : 1; |
| #ifdef KTR |
| struct in_addr ia; |
| |
| ia.s_addr = htonl(ims->ims_haddr); |
| #endif |
| |
| if (lims->imsl_st[0] == MCAST_EXCLUDE) { |
| CTR3(KTR_IGMPV3, "%s: t1 ex -= %d on %s", |
| __func__, n, inet_ntoa(ia)); |
| ims->ims_st[1].ex -= n; |
| } else if (lims->imsl_st[0] == MCAST_INCLUDE) { |
| CTR3(KTR_IGMPV3, "%s: t1 in -= %d on %s", |
| __func__, n, inet_ntoa(ia)); |
| ims->ims_st[1].in -= n; |
| } |
| |
| if (lims->imsl_st[1] == MCAST_EXCLUDE) { |
| CTR3(KTR_IGMPV3, "%s: t1 ex += %d on %s", |
| __func__, n, inet_ntoa(ia)); |
| ims->ims_st[1].ex += n; |
| } else if (lims->imsl_st[1] == MCAST_INCLUDE) { |
| CTR3(KTR_IGMPV3, "%s: t1 in += %d on %s", |
| __func__, n, inet_ntoa(ia)); |
| ims->ims_st[1].in += n; |
| } |
| } |
| |
| /* |
| * Atomically update the global in_multi state, when a membership's |
| * filter list is being updated in any way. |
| * |
| * imf is the per-inpcb-membership group filter pointer. |
| * A fake imf may be passed for in-kernel consumers. |
| * |
| * XXX This is a candidate for a set-symmetric-difference style loop |
| * which would eliminate the repeated lookup from root of ims nodes, |
| * as they share the same key space. |
| * |
| * If any error occurred this function will back out of refcounts |
| * and return a non-zero value. |
| */ |
| static int |
| inm_merge(struct in_multi *inm, /*const*/ struct in_mfilter *imf) |
| { |
| struct ip_msource *ims, *nims; |
| struct in_msource *lims; |
| int schanged, error; |
| int nsrc0, nsrc1; |
| |
| schanged = 0; |
| error = 0; |
| nsrc1 = nsrc0 = 0; |
| |
| /* |
| * Update the source filters first, as this may fail. |
| * Maintain count of in-mode filters at t0, t1. These are |
| * used to work out if we transition into ASM mode or not. |
| * Maintain a count of source filters whose state was |
| * actually modified by this operation. |
| */ |
| RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) { |
| lims = (struct in_msource *)ims; |
| if (lims->imsl_st[0] == imf->imf_st[0]) nsrc0++; |
| if (lims->imsl_st[1] == imf->imf_st[1]) nsrc1++; |
| if (lims->imsl_st[0] == lims->imsl_st[1]) continue; |
| error = inm_get_source(inm, lims->ims_haddr, 0, &nims); |
| ++schanged; |
| if (error) |
| break; |
| ims_merge(nims, lims, 0); |
| } |
| if (error) { |
| struct ip_msource *bims; |
| |
| RB_FOREACH_REVERSE_FROM(ims, ip_msource_tree, nims) { |
| lims = (struct in_msource *)ims; |
| if (lims->imsl_st[0] == lims->imsl_st[1]) |
| continue; |
| (void)inm_get_source(inm, lims->ims_haddr, 1, &bims); |
| if (bims == NULL) |
| continue; |
| ims_merge(bims, lims, 1); |
| } |
| goto out_reap; |
| } |
| |
| CTR3(KTR_IGMPV3, "%s: imf filters in-mode: %d at t0, %d at t1", |
| __func__, nsrc0, nsrc1); |
| |
| /* Handle transition between INCLUDE {n} and INCLUDE {} on socket. */ |
| if (imf->imf_st[0] == imf->imf_st[1] && |
| imf->imf_st[1] == MCAST_INCLUDE) { |
| if (nsrc1 == 0) { |
| CTR1(KTR_IGMPV3, "%s: --in on inm at t1", __func__); |
| --inm->inm_st[1].iss_in; |
| } |
| } |
| |
| /* Handle filter mode transition on socket. */ |
| if (imf->imf_st[0] != imf->imf_st[1]) { |
| CTR3(KTR_IGMPV3, "%s: imf transition %d to %d", |
| __func__, imf->imf_st[0], imf->imf_st[1]); |
| |
| if (imf->imf_st[0] == MCAST_EXCLUDE) { |
| CTR1(KTR_IGMPV3, "%s: --ex on inm at t1", __func__); |
| --inm->inm_st[1].iss_ex; |
| } else if (imf->imf_st[0] == MCAST_INCLUDE) { |
| CTR1(KTR_IGMPV3, "%s: --in on inm at t1", __func__); |
| --inm->inm_st[1].iss_in; |
| } |
| |
| if (imf->imf_st[1] == MCAST_EXCLUDE) { |
| CTR1(KTR_IGMPV3, "%s: ex++ on inm at t1", __func__); |
| inm->inm_st[1].iss_ex++; |
| } else if (imf->imf_st[1] == MCAST_INCLUDE && nsrc1 > 0) { |
| CTR1(KTR_IGMPV3, "%s: in++ on inm at t1", __func__); |
| inm->inm_st[1].iss_in++; |
| } |
| } |
| |
| /* |
| * Track inm filter state in terms of listener counts. |
| * If there are any exclusive listeners, stack-wide |
| * membership is exclusive. |
| * Otherwise, if only inclusive listeners, stack-wide is inclusive. |
| * If no listeners remain, state is undefined at t1, |
| * and the IGMP lifecycle for this group should finish. |
| */ |
| if (inm->inm_st[1].iss_ex > 0) { |
| CTR1(KTR_IGMPV3, "%s: transition to EX", __func__); |
| inm->inm_st[1].iss_fmode = MCAST_EXCLUDE; |
| } else if (inm->inm_st[1].iss_in > 0) { |
| CTR1(KTR_IGMPV3, "%s: transition to IN", __func__); |
| inm->inm_st[1].iss_fmode = MCAST_INCLUDE; |
| } else { |
| CTR1(KTR_IGMPV3, "%s: transition to UNDEF", __func__); |
| inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; |
| } |
| |
| /* Decrement ASM listener count on transition out of ASM mode. */ |
| if (imf->imf_st[0] == MCAST_EXCLUDE && nsrc0 == 0) { |
| if ((imf->imf_st[1] != MCAST_EXCLUDE) || |
| (imf->imf_st[1] == MCAST_EXCLUDE && nsrc1 > 0)) |
| CTR1(KTR_IGMPV3, "%s: --asm on inm at t1", __func__); |
| --inm->inm_st[1].iss_asm; |
| } |
| |
| /* Increment ASM listener count on transition to ASM mode. */ |
| if (imf->imf_st[1] == MCAST_EXCLUDE && nsrc1 == 0) { |
| CTR1(KTR_IGMPV3, "%s: asm++ on inm at t1", __func__); |
| inm->inm_st[1].iss_asm++; |
| } |
| |
| CTR3(KTR_IGMPV3, "%s: merged imf %p to inm %p", __func__, imf, inm); |
| inm_print(inm); |
| |
| out_reap: |
| if (schanged > 0) { |
| CTR1(KTR_IGMPV3, "%s: sources changed; reaping", __func__); |
| inm_reap(inm); |
| } |
| return (error); |
| } |
| |
| /* |
| * Mark an in_multi's filter set deltas as committed. |
| * Called by IGMP after a state change has been enqueued. |
| */ |
| void |
| inm_commit(struct in_multi *inm) |
| { |
| struct ip_msource *ims; |
| |
| CTR2(KTR_IGMPV3, "%s: commit inm %p", __func__, inm); |
| CTR1(KTR_IGMPV3, "%s: pre commit:", __func__); |
| inm_print(inm); |
| |
| RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) { |
| ims->ims_st[0] = ims->ims_st[1]; |
| } |
| inm->inm_st[0] = inm->inm_st[1]; |
| } |
| |
| /* |
| * Reap unreferenced nodes from an in_multi's filter set. |
| */ |
| static void |
| inm_reap(struct in_multi *inm) |
| { |
| struct ip_msource *ims, *tims; |
| |
| RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, tims) { |
| if (ims->ims_st[0].ex > 0 || ims->ims_st[0].in > 0 || |
| ims->ims_st[1].ex > 0 || ims->ims_st[1].in > 0 || |
| ims->ims_stp != 0) |
| continue; |
| CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims); |
| RB_REMOVE(ip_msource_tree, &inm->inm_srcs, ims); |
| bsd_free(ims, M_IPMSOURCE); |
| inm->inm_nsrc--; |
| } |
| } |
| |
| /* |
| * Purge all source nodes from an in_multi's filter set. |
| */ |
| static void |
| inm_purge(struct in_multi *inm) |
| { |
| struct ip_msource *ims, *tims; |
| |
| RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, tims) { |
| CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims); |
| RB_REMOVE(ip_msource_tree, &inm->inm_srcs, ims); |
| bsd_free(ims, M_IPMSOURCE); |
| inm->inm_nsrc--; |
| } |
| } |
| |
| /* |
| * Join a multicast group; unlocked entry point. |
| * |
| * SMPng: XXX: in_joingroup() is called from in_control() when Giant |
| * is not held. Fortunately, ifp is unlikely to have been detached |
| * at this point, so we assume it's OK to recurse. |
| */ |
| int |
| in_joingroup(struct ifnet *ifp, const struct in_addr *gina, |
| /*const*/ struct in_mfilter *imf, struct in_multi **pinm) |
| { |
| int error; |
| |
| IN_MULTI_LOCK(); |
| error = in_joingroup_locked(ifp, gina, imf, pinm); |
| IN_MULTI_UNLOCK(); |
| |
| return (error); |
| } |
| |
| /* |
| * Join a multicast group; real entry point. |
| * |
| * Only preserves atomicity at inm level. |
| * NOTE: imf argument cannot be const due to sys/tree.h limitations. |
| * |
| * If the IGMP downcall fails, the group is not joined, and an error |
| * code is returned. |
| */ |
| int |
| in_joingroup_locked(struct ifnet *ifp, const struct in_addr *gina, |
| /*const*/ struct in_mfilter *imf, struct in_multi **pinm) |
| { |
| struct in_mfilter timf; |
| struct in_multi *inm; |
| int error; |
| |
| IN_MULTI_LOCK_ASSERT(); |
| |
| CTR4(KTR_IGMPV3, "%s: join %s on %p(%s))", __func__, |
| inet_ntoa(*gina), ifp, ifp->if_xname); |
| |
| error = 0; |
| inm = NULL; |
| |
| /* |
| * If no imf was specified (i.e. kernel consumer), |
| * fake one up and assume it is an ASM join. |
| */ |
| if (imf == NULL) { |
| imf_init(&timf, MCAST_UNDEFINED, MCAST_EXCLUDE); |
| imf = &timf; |
| } |
| |
| error = in_getmulti(ifp, gina, &inm); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: in_getmulti() failure", __func__); |
| return (error); |
| } |
| |
| CTR1(KTR_IGMPV3, "%s: merge inm state", __func__); |
| error = inm_merge(inm, imf); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__); |
| goto out_inm_release; |
| } |
| |
| CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__); |
| error = igmp_change_state(inm); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: failed to update source", __func__); |
| goto out_inm_release; |
| } |
| |
| out_inm_release: |
| if (error) { |
| CTR2(KTR_IGMPV3, "%s: dropping ref on %p", __func__, inm); |
| inm_release_locked(inm); |
| } else { |
| *pinm = inm; |
| } |
| |
| return (error); |
| } |
| |
| /* |
| * Leave a multicast group; unlocked entry point. |
| */ |
| int |
| in_leavegroup(struct in_multi *inm, /*const*/ struct in_mfilter *imf) |
| { |
| struct ifnet *ifp; |
| int error; |
| |
| ifp = inm->inm_ifp; |
| |
| IN_MULTI_LOCK(); |
| error = in_leavegroup_locked(inm, imf); |
| IN_MULTI_UNLOCK(); |
| |
| return (error); |
| } |
| |
| /* |
| * Leave a multicast group; real entry point. |
| * All source filters will be expunged. |
| * |
| * Only preserves atomicity at inm level. |
| * |
| * Holding the write lock for the INP which contains imf |
| * is highly advisable. We can't assert for it as imf does not |
| * contain a back-pointer to the owning inp. |
| * |
| * Note: This is not the same as inm_release(*) as this function also |
| * makes a state change downcall into IGMP. |
| */ |
| int |
| in_leavegroup_locked(struct in_multi *inm, /*const*/ struct in_mfilter *imf) |
| { |
| struct in_mfilter timf; |
| int error; |
| |
| error = 0; |
| |
| IN_MULTI_LOCK_ASSERT(); |
| |
| CTR5(KTR_IGMPV3, "%s: leave inm %p, %s/%s, imf %p", __func__, |
| inm, inet_ntoa(inm->inm_addr), |
| (inm_is_ifp_detached(inm) ? "null" : inm->inm_ifp->if_xname), |
| imf); |
| |
| /* |
| * If no imf was specified (i.e. kernel consumer), |
| * fake one up and assume it is an ASM join. |
| */ |
| if (imf == NULL) { |
| imf_init(&timf, MCAST_EXCLUDE, MCAST_UNDEFINED); |
| imf = &timf; |
| } |
| |
| /* |
| * Begin state merge transaction at IGMP layer. |
| * |
| * As this particular invocation should not cause any memory |
| * to be allocated, and there is no opportunity to roll back |
| * the transaction, it MUST NOT fail. |
| */ |
| CTR1(KTR_IGMPV3, "%s: merge inm state", __func__); |
| error = inm_merge(inm, imf); |
| KASSERT(error == 0, ("%s: failed to merge inm state", __func__)); |
| |
| CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__); |
| error = igmp_change_state(inm); |
| if (error) |
| CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__); |
| |
| CTR2(KTR_IGMPV3, "%s: dropping ref on %p", __func__, inm); |
| inm_release_locked(inm); |
| |
| return (error); |
| } |
| |
| /*#ifndef BURN_BRIDGES*/ |
| /* |
| * Join an IPv4 multicast group in (*,G) exclusive mode. |
| * The group must be a 224.0.0.0/24 link-scope group. |
| * This KPI is for legacy kernel consumers only. |
| */ |
| struct in_multi * |
| in_addmulti(struct in_addr *ap, struct ifnet *ifp) |
| { |
| struct in_multi *pinm; |
| int error; |
| |
| KASSERT(IN_LOCAL_GROUP(ntohl(ap->s_addr)), |
| ("%s: %s not in 224.0.0.0/24", __func__, inet_ntoa(*ap))); |
| |
| error = in_joingroup(ifp, ap, NULL, &pinm); |
| if (error != 0) |
| pinm = NULL; |
| |
| return (pinm); |
| } |
| |
| /* |
| * Leave an IPv4 multicast group, assumed to be in exclusive (*,G) mode. |
| * This KPI is for legacy kernel consumers only. |
| */ |
| void |
| in_delmulti(struct in_multi *inm) |
| { |
| |
| (void)in_leavegroup(inm, NULL); |
| } |
| /*#endif*/ |
| |
| /* |
| * Block or unblock an ASM multicast source on an inpcb. |
| * This implements the delta-based API described in RFC 3678. |
| * |
| * The delta-based API applies only to exclusive-mode memberships. |
| * An IGMP downcall will be performed. |
| * |
| * SMPng: NOTE: Must take Giant as a join may create a new ifma. |
| * |
| * Return 0 if successful, otherwise return an appropriate error code. |
| */ |
| static int |
| inp_block_unblock_source(struct inpcb *inp, struct sockopt *sopt) |
| { |
| struct group_source_req gsr; |
| sockunion_t *gsa, *ssa; |
| struct ifnet *ifp; |
| struct in_mfilter *imf; |
| struct ip_moptions *imo; |
| struct in_msource *ims; |
| struct in_multi *inm; |
| size_t idx; |
| uint16_t fmode; |
| int error, doblock; |
| |
| ifp = NULL; |
| error = 0; |
| doblock = 0; |
| |
| memset(&gsr, 0, sizeof(struct group_source_req)); |
| gsa = (sockunion_t *)&gsr.gsr_group; |
| ssa = (sockunion_t *)&gsr.gsr_source; |
| |
| switch (sopt->sopt_name) { |
| case IP_BLOCK_SOURCE: |
| case IP_UNBLOCK_SOURCE: { |
| struct ip_mreq_source mreqs; |
| |
| error = sooptcopyin(sopt, &mreqs, |
| sizeof(struct ip_mreq_source), |
| sizeof(struct ip_mreq_source)); |
| if (error) |
| return (error); |
| |
| gsa->sin.sin_family = AF_INET; |
| gsa->sin.sin_len = sizeof(struct sockaddr_in); |
| gsa->sin.sin_addr = mreqs.imr_multiaddr; |
| |
| ssa->sin.sin_family = AF_INET; |
| ssa->sin.sin_len = sizeof(struct sockaddr_in); |
| ssa->sin.sin_addr = mreqs.imr_sourceaddr; |
| |
| if (!in_nullhost(mreqs.imr_interface)) |
| INADDR_TO_IFP(mreqs.imr_interface, ifp); |
| |
| if (sopt->sopt_name == IP_BLOCK_SOURCE) |
| doblock = 1; |
| |
| CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p", |
| __func__, inet_ntoa(mreqs.imr_interface), ifp); |
| break; |
| } |
| |
| case MCAST_BLOCK_SOURCE: |
| case MCAST_UNBLOCK_SOURCE: |
| error = sooptcopyin(sopt, &gsr, |
| sizeof(struct group_source_req), |
| sizeof(struct group_source_req)); |
| if (error) |
| return (error); |
| |
| if (gsa->sin.sin_family != AF_INET || |
| gsa->sin.sin_len != sizeof(struct sockaddr_in)) |
| return (EINVAL); |
| |
| if (ssa->sin.sin_family != AF_INET || |
| ssa->sin.sin_len != sizeof(struct sockaddr_in)) |
| return (EINVAL); |
| |
| if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface) |
| return (EADDRNOTAVAIL); |
| |
| ifp = ifnet_byindex(gsr.gsr_interface); |
| |
| if (sopt->sopt_name == MCAST_BLOCK_SOURCE) |
| doblock = 1; |
| break; |
| |
| default: |
| CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d", |
| __func__, sopt->sopt_name); |
| return (EOPNOTSUPP); |
| break; |
| } |
| |
| if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr))) |
| return (EINVAL); |
| |
| /* |
| * Check if we are actually a member of this group. |
| */ |
| imo = inp_findmoptions(inp); |
| idx = imo_match_group(imo, ifp, &gsa->sa); |
| if (idx == -1 || imo->imo_mfilters == NULL) { |
| error = EADDRNOTAVAIL; |
| goto out_inp_locked; |
| } |
| |
| KASSERT(imo->imo_mfilters != NULL, |
| ("%s: imo_mfilters not allocated", __func__)); |
| imf = &imo->imo_mfilters[idx]; |
| inm = imo->imo_membership[idx]; |
| |
| /* |
| * Attempting to use the delta-based API on an |
| * non exclusive-mode membership is an error. |
| */ |
| fmode = imf->imf_st[0]; |
| if (fmode != MCAST_EXCLUDE) { |
| error = EINVAL; |
| goto out_inp_locked; |
| } |
| |
| /* |
| * Deal with error cases up-front: |
| * Asked to block, but already blocked; or |
| * Asked to unblock, but nothing to unblock. |
| * If adding a new block entry, allocate it. |
| */ |
| ims = imo_match_source(imo, idx, &ssa->sa); |
| if ((ims != NULL && doblock) || (ims == NULL && !doblock)) { |
| CTR3(KTR_IGMPV3, "%s: source %s %spresent", __func__, |
| inet_ntoa(ssa->sin.sin_addr), doblock ? "" : "not "); |
| error = EADDRNOTAVAIL; |
| goto out_inp_locked; |
| } |
| |
| INP_WLOCK_ASSERT(inp); |
| |
| /* |
| * Begin state merge transaction at socket layer. |
| */ |
| if (doblock) { |
| CTR2(KTR_IGMPV3, "%s: %s source", __func__, "block"); |
| ims = imf_graft(imf, fmode, &ssa->sin); |
| if (ims == NULL) |
| error = ENOMEM; |
| } else { |
| CTR2(KTR_IGMPV3, "%s: %s source", __func__, "allow"); |
| error = imf_prune(imf, &ssa->sin); |
| } |
| |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: merge imf state failed", __func__); |
| goto out_imf_rollback; |
| } |
| |
| /* |
| * Begin state merge transaction at IGMP layer. |
| */ |
| IN_MULTI_LOCK(); |
| |
| CTR1(KTR_IGMPV3, "%s: merge inm state", __func__); |
| error = inm_merge(inm, imf); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__); |
| goto out_imf_rollback; |
| } |
| |
| CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__); |
| error = igmp_change_state(inm); |
| if (error) |
| CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__); |
| |
| IN_MULTI_UNLOCK(); |
| |
| out_imf_rollback: |
| if (error) |
| imf_rollback(imf); |
| else |
| imf_commit(imf); |
| |
| imf_reap(imf); |
| |
| out_inp_locked: |
| INP_WUNLOCK(inp); |
| return (error); |
| } |
| |
| /* |
| * Given an inpcb, return its multicast options structure pointer. Accepts |
| * an unlocked inpcb pointer, but will return it locked. May sleep. |
| * |
| * SMPng: NOTE: Potentially calls bsd_malloc(M_WAITOK) with Giant held. |
| * SMPng: NOTE: Returns with the INP write lock held. |
| */ |
| static struct ip_moptions * |
| inp_findmoptions(struct inpcb *inp) |
| { |
| struct ip_moptions *imo; |
| struct in_multi **immp; |
| struct in_mfilter *imfp; |
| size_t idx; |
| |
| INP_WLOCK(inp); |
| if (inp->inp_moptions != NULL) |
| return (inp->inp_moptions); |
| |
| INP_WUNLOCK(inp); |
| |
| imo = bsd_malloc(sizeof(*imo), M_IPMOPTS, M_WAITOK); |
| immp = bsd_malloc(sizeof(*immp) * IP_MIN_MEMBERSHIPS, M_IPMOPTS, M_WAITOK | M_ZERO); |
| imfp = bsd_malloc(sizeof(struct in_mfilter) * IP_MIN_MEMBERSHIPS, M_INMFILTER, M_WAITOK); |
| |
| imo->imo_multicast_ifp = NULL; |
| imo->imo_multicast_addr.s_addr = INADDR_ANY; |
| imo->imo_multicast_vif = -1; |
| imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; |
| imo->imo_multicast_loop = in_mcast_loop; |
| imo->imo_num_memberships = 0; |
| imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; |
| imo->imo_membership = immp; |
| |
| /* Initialize per-group source filters. */ |
| for (idx = 0; idx < IP_MIN_MEMBERSHIPS; idx++) |
| imf_init(&imfp[idx], MCAST_UNDEFINED, MCAST_EXCLUDE); |
| imo->imo_mfilters = imfp; |
| |
| INP_WLOCK(inp); |
| if (inp->inp_moptions != NULL) { |
| bsd_free(imfp, M_INMFILTER); |
| bsd_free(immp, M_IPMOPTS); |
| bsd_free(imo, M_IPMOPTS); |
| return (inp->inp_moptions); |
| } |
| inp->inp_moptions = imo; |
| return (imo); |
| } |
| |
| /* |
| * Discard the IP multicast options (and source filters). |
| * |
| * SMPng: NOTE: assumes INP write lock is held. |
| */ |
| void |
| inp_freemoptions(struct ip_moptions *imo) |
| { |
| struct in_mfilter *imf; |
| size_t idx, nmships; |
| |
| KASSERT(imo != NULL, ("%s: ip_moptions is NULL", __func__)); |
| |
| nmships = imo->imo_num_memberships; |
| for (idx = 0; idx < nmships; ++idx) { |
| imf = imo->imo_mfilters ? &imo->imo_mfilters[idx] : NULL; |
| if (imf) |
| imf_leave(imf); |
| (void)in_leavegroup(imo->imo_membership[idx], imf); |
| if (imf) |
| imf_purge(imf); |
| } |
| |
| if (imo->imo_mfilters) |
| bsd_free(imo->imo_mfilters, M_INMFILTER); |
| bsd_free(imo->imo_membership, M_IPMOPTS); |
| bsd_free(imo, M_IPMOPTS); |
| } |
| |
| /* |
| * Atomically get source filters on a socket for an IPv4 multicast group. |
| * Called with INP lock held; returns with lock released. |
| */ |
| static int |
| inp_get_source_filters(struct inpcb *inp, struct sockopt *sopt) |
| { |
| struct __msfilterreq msfr; |
| sockunion_t *gsa; |
| struct ifnet *ifp; |
| struct ip_moptions *imo; |
| struct in_mfilter *imf; |
| struct ip_msource *ims; |
| struct in_msource *lims; |
| struct sockaddr_in *psin; |
| struct sockaddr_storage *ptss; |
| struct sockaddr_storage *tss; |
| int error; |
| size_t idx, nsrcs, ncsrcs; |
| |
| INP_WLOCK_ASSERT(inp); |
| |
| imo = inp->inp_moptions; |
| KASSERT(imo != NULL, ("%s: null ip_moptions", __func__)); |
| |
| INP_WUNLOCK(inp); |
| |
| error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq), |
| sizeof(struct __msfilterreq)); |
| if (error) |
| return (error); |
| |
| if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex) |
| return (EINVAL); |
| |
| ifp = ifnet_byindex(msfr.msfr_ifindex); |
| if (ifp == NULL) |
| return (EINVAL); |
| |
| INP_WLOCK(inp); |
| |
| /* |
| * Lookup group on the socket. |
| */ |
| gsa = (sockunion_t *)&msfr.msfr_group; |
| idx = imo_match_group(imo, ifp, &gsa->sa); |
| if (idx == -1 || imo->imo_mfilters == NULL) { |
| INP_WUNLOCK(inp); |
| return (EADDRNOTAVAIL); |
| } |
| imf = &imo->imo_mfilters[idx]; |
| |
| /* |
| * Ignore memberships which are in limbo. |
| */ |
| if (imf->imf_st[1] == MCAST_UNDEFINED) { |
| INP_WUNLOCK(inp); |
| return (EAGAIN); |
| } |
| msfr.msfr_fmode = imf->imf_st[1]; |
| |
| /* |
| * If the user specified a buffer, copy out the source filter |
| * entries to userland gracefully. |
| * We only copy out the number of entries which userland |
| * has asked for, but we always tell userland how big the |
| * buffer really needs to be. |
| */ |
| tss = NULL; |
| if (msfr.msfr_srcs != NULL && msfr.msfr_nsrcs > 0) { |
| tss = bsd_malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs, M_TEMP, M_NOWAIT | M_ZERO); |
| if (tss == NULL) { |
| INP_WUNLOCK(inp); |
| return (ENOBUFS); |
| } |
| } |
| |
| /* |
| * Count number of sources in-mode at t0. |
| * If buffer space exists and remains, copy out source entries. |
| */ |
| nsrcs = msfr.msfr_nsrcs; |
| ncsrcs = 0; |
| ptss = tss; |
| RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) { |
| lims = (struct in_msource *)ims; |
| if (lims->imsl_st[0] == MCAST_UNDEFINED || |
| lims->imsl_st[0] != imf->imf_st[0]) |
| continue; |
| ++ncsrcs; |
| if (tss != NULL && nsrcs > 0) { |
| psin = (struct sockaddr_in *)ptss; |
| psin->sin_family = AF_INET; |
| psin->sin_len = sizeof(struct sockaddr_in); |
| psin->sin_addr.s_addr = htonl(lims->ims_haddr); |
| psin->sin_port = 0; |
| ++ptss; |
| --nsrcs; |
| } |
| } |
| |
| INP_WUNLOCK(inp); |
| |
| if (tss != NULL) { |
| error = copyout(tss, msfr.msfr_srcs, |
| sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs); |
| bsd_free(tss, M_TEMP); |
| if (error) |
| return (error); |
| } |
| |
| msfr.msfr_nsrcs = ncsrcs; |
| error = sooptcopyout(sopt, &msfr, sizeof(struct __msfilterreq)); |
| |
| return (error); |
| } |
| |
| /* |
| * Return the IP multicast options in response to user getsockopt(). |
| */ |
| int |
| inp_getmoptions(struct inpcb *inp, struct sockopt *sopt) |
| { |
| struct ip_mreqn mreqn; |
| struct ip_moptions *imo; |
| struct ifnet *ifp; |
| struct in_ifaddr *ia; |
| int error, optval; |
| u_char coptval; |
| |
| INP_WLOCK(inp); |
| imo = inp->inp_moptions; |
| /* |
| * If socket is neither of type SOCK_RAW or SOCK_DGRAM, |
| * or is a divert socket, reject it. |
| */ |
| if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT || |
| (inp->inp_socket->so_proto->pr_type != SOCK_RAW && |
| inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)) { |
| INP_WUNLOCK(inp); |
| return (EOPNOTSUPP); |
| } |
| |
| error = 0; |
| switch (sopt->sopt_name) { |
| case IP_MULTICAST_VIF: |
| if (imo != NULL) |
| optval = imo->imo_multicast_vif; |
| else |
| optval = -1; |
| INP_WUNLOCK(inp); |
| error = sooptcopyout(sopt, &optval, sizeof(int)); |
| break; |
| |
| case IP_MULTICAST_IF: |
| memset(&mreqn, 0, sizeof(struct ip_mreqn)); |
| if (imo != NULL) { |
| ifp = imo->imo_multicast_ifp; |
| if (!in_nullhost(imo->imo_multicast_addr)) { |
| mreqn.imr_address = imo->imo_multicast_addr; |
| } else if (ifp != NULL) { |
| mreqn.imr_ifindex = ifp->if_index; |
| IFP_TO_IA(ifp, ia); |
| if (ia != NULL) { |
| mreqn.imr_address = |
| IA_SIN(ia)->sin_addr; |
| ifa_free(&ia->ia_ifa); |
| } |
| } |
| } |
| INP_WUNLOCK(inp); |
| if (sopt->sopt_valsize == sizeof(struct ip_mreqn)) { |
| error = sooptcopyout(sopt, &mreqn, |
| sizeof(struct ip_mreqn)); |
| } else { |
| error = sooptcopyout(sopt, &mreqn.imr_address, |
| sizeof(struct in_addr)); |
| } |
| break; |
| |
| case IP_MULTICAST_TTL: |
| if (imo == 0) |
| optval = coptval = IP_DEFAULT_MULTICAST_TTL; |
| else |
| optval = coptval = imo->imo_multicast_ttl; |
| INP_WUNLOCK(inp); |
| if (sopt->sopt_valsize == sizeof(u_char)) |
| error = sooptcopyout(sopt, &coptval, sizeof(u_char)); |
| else |
| error = sooptcopyout(sopt, &optval, sizeof(int)); |
| break; |
| |
| case IP_MULTICAST_LOOP: |
| if (imo == 0) |
| optval = coptval = IP_DEFAULT_MULTICAST_LOOP; |
| else |
| optval = coptval = imo->imo_multicast_loop; |
| INP_WUNLOCK(inp); |
| if (sopt->sopt_valsize == sizeof(u_char)) |
| error = sooptcopyout(sopt, &coptval, sizeof(u_char)); |
| else |
| error = sooptcopyout(sopt, &optval, sizeof(int)); |
| break; |
| |
| case IP_MSFILTER: |
| if (imo == NULL) { |
| error = EADDRNOTAVAIL; |
| INP_WUNLOCK(inp); |
| } else { |
| error = inp_get_source_filters(inp, sopt); |
| } |
| break; |
| |
| default: |
| INP_WUNLOCK(inp); |
| error = ENOPROTOOPT; |
| break; |
| } |
| |
| INP_UNLOCK_ASSERT(inp); |
| |
| return (error); |
| } |
| |
| /* |
| * Look up the ifnet to use for a multicast group membership, |
| * given the IPv4 address of an interface, and the IPv4 group address. |
| * |
| * This routine exists to support legacy multicast applications |
| * which do not understand that multicast memberships are scoped to |
| * specific physical links in the networking stack, or which need |
| * to join link-scope groups before IPv4 addresses are configured. |
| * |
| * If inp is non-NULL, use this socket's current FIB number for any |
| * required FIB lookup. |
| * If ina is INADDR_ANY, look up the group address in the unicast FIB, |
| * and use its ifp; usually, this points to the default next-hop. |
| * |
| * If the FIB lookup fails, attempt to use the first non-loopback |
| * interface with multicast capability in the system as a |
| * last resort. The legacy IPv4 ASM API requires that we do |
| * this in order to allow groups to be joined when the routing |
| * table has not yet been populated during boot. |
| * |
| * Returns NULL if no ifp could be found. |
| * |
| * SMPng: TODO: Acquire the appropriate locks for INADDR_TO_IFP. |
| * FUTURE: Implement IPv4 source-address selection. |
| */ |
| static struct ifnet * |
| inp_lookup_mcast_ifp(const struct inpcb *inp, |
| const struct sockaddr_in *gsin, const struct in_addr ina) |
| { |
| struct ifnet *ifp; |
| |
| KASSERT(gsin->sin_family == AF_INET, ("%s: not AF_INET", __func__)); |
| KASSERT(IN_MULTICAST(ntohl(gsin->sin_addr.s_addr)), |
| ("%s: not multicast", __func__)); |
| |
| ifp = NULL; |
| if (!in_nullhost(ina)) { |
| INADDR_TO_IFP(ina, ifp); |
| } else { |
| struct route ro; |
| |
| ro.ro_rt = NULL; |
| memcpy(&ro.ro_dst, gsin, sizeof(struct sockaddr_in)); |
| in_rtalloc_ign(&ro, 0, inp ? inp->inp_inc.inc_fibnum : 0); |
| if (ro.ro_rt != NULL) { |
| ifp = ro.ro_rt->rt_ifp; |
| KASSERT(ifp != NULL, ("%s: null ifp", __func__)); |
| RTFREE(ro.ro_rt); |
| } else { |
| struct in_ifaddr *ia; |
| struct ifnet *mifp; |
| |
| mifp = NULL; |
| IN_IFADDR_RLOCK(); |
| TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { |
| mifp = ia->ia_ifp; |
| if (!(mifp->if_flags & IFF_LOOPBACK) && |
| (mifp->if_flags & IFF_MULTICAST)) { |
| ifp = mifp; |
| break; |
| } |
| } |
| IN_IFADDR_RUNLOCK(); |
| } |
| } |
| |
| return (ifp); |
| } |
| |
| /* |
| * Join an IPv4 multicast group, possibly with a source. |
| */ |
| static int |
| inp_join_group(struct inpcb *inp, struct sockopt *sopt) |
| { |
| struct group_source_req gsr; |
| sockunion_t *gsa, *ssa; |
| struct ifnet *ifp; |
| struct in_mfilter *imf; |
| struct ip_moptions *imo; |
| struct in_multi *inm; |
| struct in_msource *lims; |
| size_t idx; |
| int error, is_new; |
| |
| ifp = NULL; |
| imf = NULL; |
| error = 0; |
| is_new = 0; |
| |
| memset(&gsr, 0, sizeof(struct group_source_req)); |
| gsa = (sockunion_t *)&gsr.gsr_group; |
| gsa->ss.ss_family = AF_UNSPEC; |
| ssa = (sockunion_t *)&gsr.gsr_source; |
| ssa->ss.ss_family = AF_UNSPEC; |
| |
| switch (sopt->sopt_name) { |
| case IP_ADD_MEMBERSHIP: |
| case IP_ADD_SOURCE_MEMBERSHIP: { |
| struct ip_mreq_source mreqs; |
| |
| if (sopt->sopt_name == IP_ADD_MEMBERSHIP) { |
| error = sooptcopyin(sopt, &mreqs, |
| sizeof(struct ip_mreq), |
| sizeof(struct ip_mreq)); |
| /* |
| * Do argument switcharoo from ip_mreq into |
| * ip_mreq_source to avoid using two instances. |
| */ |
| mreqs.imr_interface = mreqs.imr_sourceaddr; |
| mreqs.imr_sourceaddr.s_addr = INADDR_ANY; |
| } else if (sopt->sopt_name == IP_ADD_SOURCE_MEMBERSHIP) { |
| error = sooptcopyin(sopt, &mreqs, |
| sizeof(struct ip_mreq_source), |
| sizeof(struct ip_mreq_source)); |
| } |
| if (error) |
| return (error); |
| |
| gsa->sin.sin_family = AF_INET; |
| gsa->sin.sin_len = sizeof(struct sockaddr_in); |
| gsa->sin.sin_addr = mreqs.imr_multiaddr; |
| |
| if (sopt->sopt_name == IP_ADD_SOURCE_MEMBERSHIP) { |
| ssa->sin.sin_family = AF_INET; |
| ssa->sin.sin_len = sizeof(struct sockaddr_in); |
| ssa->sin.sin_addr = mreqs.imr_sourceaddr; |
| } |
| |
| if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr))) |
| return (EINVAL); |
| |
| ifp = inp_lookup_mcast_ifp(inp, &gsa->sin, |
| mreqs.imr_interface); |
| CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p", |
| __func__, inet_ntoa(mreqs.imr_interface), ifp); |
| break; |
| } |
| |
| case MCAST_JOIN_GROUP: |
| case MCAST_JOIN_SOURCE_GROUP: |
| if (sopt->sopt_name == MCAST_JOIN_GROUP) { |
| error = sooptcopyin(sopt, &gsr, |
| sizeof(struct group_req), |
| sizeof(struct group_req)); |
| } else if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) { |
| error = sooptcopyin(sopt, &gsr, |
| sizeof(struct group_source_req), |
| sizeof(struct group_source_req)); |
| } |
| if (error) |
| return (error); |
| |
| if (gsa->sin.sin_family != AF_INET || |
| gsa->sin.sin_len != sizeof(struct sockaddr_in)) |
| return (EINVAL); |
| |
| /* |
| * Overwrite the port field if present, as the sockaddr |
| * being copied in may be matched with a binary comparison. |
| */ |
| gsa->sin.sin_port = 0; |
| if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) { |
| if (ssa->sin.sin_family != AF_INET || |
| ssa->sin.sin_len != sizeof(struct sockaddr_in)) |
| return (EINVAL); |
| ssa->sin.sin_port = 0; |
| } |
| |
| if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr))) |
| return (EINVAL); |
| |
| if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface) |
| return (EADDRNOTAVAIL); |
| ifp = ifnet_byindex(gsr.gsr_interface); |
| break; |
| |
| default: |
| CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d", |
| __func__, sopt->sopt_name); |
| return (EOPNOTSUPP); |
| break; |
| } |
| |
| if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) |
| return (EADDRNOTAVAIL); |
| |
| imo = inp_findmoptions(inp); |
| idx = imo_match_group(imo, ifp, &gsa->sa); |
| if (idx == -1) { |
| is_new = 1; |
| } else { |
| inm = imo->imo_membership[idx]; |
| imf = &imo->imo_mfilters[idx]; |
| if (ssa->ss.ss_family != AF_UNSPEC) { |
| /* |
| * MCAST_JOIN_SOURCE_GROUP on an exclusive membership |
| * is an error. On an existing inclusive membership, |
| * it just adds the source to the filter list. |
| */ |
| if (imf->imf_st[1] != MCAST_INCLUDE) { |
| error = EINVAL; |
| goto out_inp_locked; |
| } |
| /* Throw out duplicates. */ |
| lims = imo_match_source(imo, idx, &ssa->sa); |
| if (lims != NULL) { |
| error = EADDRNOTAVAIL; |
| goto out_inp_locked; |
| } |
| } else { |
| /* |
| * MCAST_JOIN_GROUP on an existing inclusive |
| * membership is an error; if you want to change |
| * filter mode, you must use the userland API |
| * setsourcefilter(). |
| */ |
| if (imf->imf_st[1] == MCAST_INCLUDE) { |
| error = EINVAL; |
| goto out_inp_locked; |
| } |
| } |
| } |
| |
| /* |
| * Begin state merge transaction at socket layer. |
| */ |
| INP_WLOCK_ASSERT(inp); |
| |
| if (is_new) { |
| if (imo->imo_num_memberships == imo->imo_max_memberships) { |
| error = imo_grow(imo); |
| if (error) |
| goto out_inp_locked; |
| } |
| /* |
| * Allocate the new slot upfront so we can deal with |
| * grafting the new source filter in same code path |
| * as for join-source on existing membership. |
| */ |
| idx = imo->imo_num_memberships; |
| imo->imo_membership[idx] = NULL; |
| imo->imo_num_memberships++; |
| KASSERT(imo->imo_mfilters != NULL, |
| ("%s: imf_mfilters vector was not allocated", __func__)); |
| imf = &imo->imo_mfilters[idx]; |
| KASSERT(RB_EMPTY(&imf->imf_sources), |
| ("%s: imf_sources not empty", __func__)); |
| } |
| |
| /* |
| * Graft new source into filter list for this inpcb's |
| * membership of the group. The in_multi may not have |
| * been allocated yet if this is a new membership, however, |
| * the in_mfilter slot will be allocated and must be initialized. |
| */ |
| if (ssa->ss.ss_family != AF_UNSPEC) { |
| /* Membership starts in IN mode */ |
| if (is_new) { |
| CTR1(KTR_IGMPV3, "%s: new join w/source", __func__); |
| imf_init(imf, MCAST_UNDEFINED, MCAST_INCLUDE); |
| } else { |
| CTR2(KTR_IGMPV3, "%s: %s source", __func__, "allow"); |
| } |
| lims = imf_graft(imf, MCAST_INCLUDE, &ssa->sin); |
| if (lims == NULL) { |
| CTR1(KTR_IGMPV3, "%s: merge imf state failed", |
| __func__); |
| error = ENOMEM; |
| goto out_imo_free; |
| } |
| } else { |
| /* No address specified; Membership starts in EX mode */ |
| if (is_new) { |
| CTR1(KTR_IGMPV3, "%s: new join w/o source", __func__); |
| imf_init(imf, MCAST_UNDEFINED, MCAST_EXCLUDE); |
| } |
| } |
| |
| /* |
| * Begin state merge transaction at IGMP layer. |
| */ |
| IN_MULTI_LOCK(); |
| |
| if (is_new) { |
| error = in_joingroup_locked(ifp, &gsa->sin.sin_addr, imf, |
| &inm); |
| if (error) |
| goto out_imo_free; |
| imo->imo_membership[idx] = inm; |
| } else { |
| CTR1(KTR_IGMPV3, "%s: merge inm state", __func__); |
| error = inm_merge(inm, imf); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: failed to merge inm state", |
| __func__); |
| goto out_imf_rollback; |
| } |
| CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__); |
| error = igmp_change_state(inm); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: failed igmp downcall", |
| __func__); |
| goto out_imf_rollback; |
| } |
| } |
| |
| IN_MULTI_UNLOCK(); |
| |
| out_imf_rollback: |
| INP_WLOCK_ASSERT(inp); |
| if (error) { |
| imf_rollback(imf); |
| if (is_new) |
| imf_purge(imf); |
| else |
| imf_reap(imf); |
| } else { |
| imf_commit(imf); |
| } |
| |
| out_imo_free: |
| if (error && is_new) { |
| imo->imo_membership[idx] = NULL; |
| --imo->imo_num_memberships; |
| } |
| |
| out_inp_locked: |
| INP_WUNLOCK(inp); |
| return (error); |
| } |
| |
| /* |
| * Leave an IPv4 multicast group on an inpcb, possibly with a source. |
| */ |
| static int |
| inp_leave_group(struct inpcb *inp, struct sockopt *sopt) |
| { |
| struct group_source_req gsr; |
| struct ip_mreq_source mreqs; |
| sockunion_t *gsa, *ssa; |
| struct ifnet *ifp; |
| struct in_mfilter *imf; |
| struct ip_moptions *imo; |
| struct in_msource *ims; |
| struct in_multi *inm; |
| size_t idx; |
| int error, is_final; |
| |
| ifp = NULL; |
| error = 0; |
| is_final = 1; |
| |
| memset(&gsr, 0, sizeof(struct group_source_req)); |
| gsa = (sockunion_t *)&gsr.gsr_group; |
| gsa->ss.ss_family = AF_UNSPEC; |
| ssa = (sockunion_t *)&gsr.gsr_source; |
| ssa->ss.ss_family = AF_UNSPEC; |
| |
| switch (sopt->sopt_name) { |
| case IP_DROP_MEMBERSHIP: |
| case IP_DROP_SOURCE_MEMBERSHIP: |
| if (sopt->sopt_name == IP_DROP_MEMBERSHIP) { |
| error = sooptcopyin(sopt, &mreqs, |
| sizeof(struct ip_mreq), |
| sizeof(struct ip_mreq)); |
| /* |
| * Swap interface and sourceaddr arguments, |
| * as ip_mreq and ip_mreq_source are laid |
| * out differently. |
| */ |
| mreqs.imr_interface = mreqs.imr_sourceaddr; |
| mreqs.imr_sourceaddr.s_addr = INADDR_ANY; |
| } else if (sopt->sopt_name == IP_DROP_SOURCE_MEMBERSHIP) { |
| error = sooptcopyin(sopt, &mreqs, |
| sizeof(struct ip_mreq_source), |
| sizeof(struct ip_mreq_source)); |
| } |
| if (error) |
| return (error); |
| |
| gsa->sin.sin_family = AF_INET; |
| gsa->sin.sin_len = sizeof(struct sockaddr_in); |
| gsa->sin.sin_addr = mreqs.imr_multiaddr; |
| |
| if (sopt->sopt_name == IP_DROP_SOURCE_MEMBERSHIP) { |
| ssa->sin.sin_family = AF_INET; |
| ssa->sin.sin_len = sizeof(struct sockaddr_in); |
| ssa->sin.sin_addr = mreqs.imr_sourceaddr; |
| } |
| |
| if (!in_nullhost(gsa->sin.sin_addr)) |
| INADDR_TO_IFP(mreqs.imr_interface, ifp); |
| |
| CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p", |
| __func__, inet_ntoa(mreqs.imr_interface), ifp); |
| |
| break; |
| |
| case MCAST_LEAVE_GROUP: |
| case MCAST_LEAVE_SOURCE_GROUP: |
| if (sopt->sopt_name == MCAST_LEAVE_GROUP) { |
| error = sooptcopyin(sopt, &gsr, |
| sizeof(struct group_req), |
| sizeof(struct group_req)); |
| } else if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) { |
| error = sooptcopyin(sopt, &gsr, |
| sizeof(struct group_source_req), |
| sizeof(struct group_source_req)); |
| } |
| if (error) |
| return (error); |
| |
| if (gsa->sin.sin_family != AF_INET || |
| gsa->sin.sin_len != sizeof(struct sockaddr_in)) |
| return (EINVAL); |
| |
| if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) { |
| if (ssa->sin.sin_family != AF_INET || |
| ssa->sin.sin_len != sizeof(struct sockaddr_in)) |
| return (EINVAL); |
| } |
| |
| if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface) |
| return (EADDRNOTAVAIL); |
| |
| ifp = ifnet_byindex(gsr.gsr_interface); |
| break; |
| |
| default: |
| CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d", |
| __func__, sopt->sopt_name); |
| return (EOPNOTSUPP); |
| break; |
| } |
| |
| if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr))) |
| return (EINVAL); |
| |
| if (ifp == NULL) |
| return (EADDRNOTAVAIL); |
| |
| /* |
| * Find the membership in the membership array. |
| */ |
| imo = inp_findmoptions(inp); |
| idx = imo_match_group(imo, ifp, &gsa->sa); |
| if (idx == -1) { |
| error = EADDRNOTAVAIL; |
| goto out_inp_locked; |
| } |
| inm = imo->imo_membership[idx]; |
| imf = &imo->imo_mfilters[idx]; |
| |
| if (ssa->ss.ss_family != AF_UNSPEC) |
| is_final = 0; |
| |
| /* |
| * Begin state merge transaction at socket layer. |
| */ |
| INP_WLOCK_ASSERT(inp); |
| |
| /* |
| * If we were instructed only to leave a given source, do so. |
| * MCAST_LEAVE_SOURCE_GROUP is only valid for inclusive memberships. |
| */ |
| if (is_final) { |
| imf_leave(imf); |
| } else { |
| if (imf->imf_st[0] == MCAST_EXCLUDE) { |
| error = EADDRNOTAVAIL; |
| goto out_inp_locked; |
| } |
| ims = imo_match_source(imo, idx, &ssa->sa); |
| if (ims == NULL) { |
| CTR3(KTR_IGMPV3, "%s: source %s %spresent", __func__, |
| inet_ntoa(ssa->sin.sin_addr), "not "); |
| error = EADDRNOTAVAIL; |
| goto out_inp_locked; |
| } |
| CTR2(KTR_IGMPV3, "%s: %s source", __func__, "block"); |
| error = imf_prune(imf, &ssa->sin); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: merge imf state failed", |
| __func__); |
| goto out_inp_locked; |
| } |
| } |
| |
| /* |
| * Begin state merge transaction at IGMP layer. |
| */ |
| IN_MULTI_LOCK(); |
| |
| if (is_final) { |
| /* |
| * Give up the multicast address record to which |
| * the membership points. |
| */ |
| (void)in_leavegroup_locked(inm, imf); |
| } else { |
| CTR1(KTR_IGMPV3, "%s: merge inm state", __func__); |
| error = inm_merge(inm, imf); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: failed to merge inm state", |
| __func__); |
| goto out_imf_rollback; |
| } |
| |
| CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__); |
| error = igmp_change_state(inm); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: failed igmp downcall", |
| __func__); |
| } |
| } |
| |
| IN_MULTI_UNLOCK(); |
| |
| out_imf_rollback: |
| if (error) |
| imf_rollback(imf); |
| else |
| imf_commit(imf); |
| |
| imf_reap(imf); |
| |
| if (is_final) { |
| /* Remove the gap in the membership and filter array. */ |
| for (++idx; idx < imo->imo_num_memberships; ++idx) { |
| imo->imo_membership[idx-1] = imo->imo_membership[idx]; |
| imo->imo_mfilters[idx-1] = imo->imo_mfilters[idx]; |
| } |
| imo->imo_num_memberships--; |
| } |
| |
| out_inp_locked: |
| INP_WUNLOCK(inp); |
| return (error); |
| } |
| |
| /* |
| * Select the interface for transmitting IPv4 multicast datagrams. |
| * |
| * Either an instance of struct in_addr or an instance of struct ip_mreqn |
| * may be passed to this socket option. An address of INADDR_ANY or an |
| * interface index of 0 is used to remove a previous selection. |
| * When no interface is selected, one is chosen for every send. |
| */ |
| static int |
| inp_set_multicast_if(struct inpcb *inp, struct sockopt *sopt) |
| { |
| struct in_addr addr; |
| struct ip_mreqn mreqn; |
| struct ifnet *ifp; |
| struct ip_moptions *imo; |
| int error; |
| |
| if (sopt->sopt_valsize == sizeof(struct ip_mreqn)) { |
| /* |
| * An interface index was specified using the |
| * Linux-derived ip_mreqn structure. |
| */ |
| error = sooptcopyin(sopt, &mreqn, sizeof(struct ip_mreqn), |
| sizeof(struct ip_mreqn)); |
| if (error) |
| return (error); |
| |
| if (mreqn.imr_ifindex < 0 || V_if_index < mreqn.imr_ifindex) |
| return (EINVAL); |
| |
| if (mreqn.imr_ifindex == 0) { |
| ifp = NULL; |
| } else { |
| ifp = ifnet_byindex(mreqn.imr_ifindex); |
| if (ifp == NULL) |
| return (EADDRNOTAVAIL); |
| } |
| } else { |
| /* |
| * An interface was specified by IPv4 address. |
| * This is the traditional BSD usage. |
| */ |
| error = sooptcopyin(sopt, &addr, sizeof(struct in_addr), |
| sizeof(struct in_addr)); |
| if (error) |
| return (error); |
| if (in_nullhost(addr)) { |
| ifp = NULL; |
| } else { |
| INADDR_TO_IFP(addr, ifp); |
| if (ifp == NULL) |
| return (EADDRNOTAVAIL); |
| } |
| CTR3(KTR_IGMPV3, "%s: ifp = %p, addr = %s", __func__, ifp, |
| inet_ntoa(addr)); |
| } |
| |
| /* Reject interfaces which do not support multicast. */ |
| if (ifp != NULL && (ifp->if_flags & IFF_MULTICAST) == 0) |
| return (EOPNOTSUPP); |
| |
| imo = inp_findmoptions(inp); |
| imo->imo_multicast_ifp = ifp; |
| imo->imo_multicast_addr.s_addr = INADDR_ANY; |
| INP_WUNLOCK(inp); |
| |
| return (0); |
| } |
| |
| /* |
| * Atomically set source filters on a socket for an IPv4 multicast group. |
| * |
| * SMPng: NOTE: Potentially calls bsd_malloc(M_WAITOK) with Giant held. |
| */ |
| static int |
| inp_set_source_filters(struct inpcb *inp, struct sockopt *sopt) |
| { |
| struct __msfilterreq msfr; |
| sockunion_t *gsa; |
| struct ifnet *ifp; |
| struct in_mfilter *imf; |
| struct ip_moptions *imo; |
| struct in_multi *inm; |
| size_t idx; |
| int error; |
| |
| error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq), |
| sizeof(struct __msfilterreq)); |
| if (error) |
| return (error); |
| |
| if (msfr.msfr_nsrcs > in_mcast_maxsocksrc || |
| (msfr.msfr_fmode != MCAST_EXCLUDE && |
| msfr.msfr_fmode != MCAST_INCLUDE)) |
| return (EINVAL); |
| |
| if (msfr.msfr_group.ss_family != AF_INET || |
| msfr.msfr_group.ss_len != sizeof(struct sockaddr_in)) |
| return (EINVAL); |
| |
| gsa = (sockunion_t *)&msfr.msfr_group; |
| if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr))) |
| return (EINVAL); |
| |
| gsa->sin.sin_port = 0; /* ignore port */ |
| |
| if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex) |
| return (EADDRNOTAVAIL); |
| |
| ifp = ifnet_byindex(msfr.msfr_ifindex); |
| if (ifp == NULL) |
| return (EADDRNOTAVAIL); |
| |
| /* |
| * Take the INP write lock. |
| * Check if this socket is a member of this group. |
| */ |
| imo = inp_findmoptions(inp); |
| idx = imo_match_group(imo, ifp, &gsa->sa); |
| if (idx == -1 || imo->imo_mfilters == NULL) { |
| error = EADDRNOTAVAIL; |
| goto out_inp_locked; |
| } |
| inm = imo->imo_membership[idx]; |
| imf = &imo->imo_mfilters[idx]; |
| |
| /* |
| * Begin state merge transaction at socket layer. |
| */ |
| INP_WLOCK_ASSERT(inp); |
| |
| imf->imf_st[1] = msfr.msfr_fmode; |
| |
| /* |
| * Apply any new source filters, if present. |
| * Make a copy of the user-space source vector so |
| * that we may copy them with a single copyin. This |
| * allows us to deal with page faults up-front. |
| */ |
| if (msfr.msfr_nsrcs > 0) { |
| struct in_msource *lims; |
| struct sockaddr_in *psin; |
| struct sockaddr_storage *kss, *pkss; |
| int i; |
| |
| INP_WUNLOCK(inp); |
| |
| CTR2(KTR_IGMPV3, "%s: loading %lu source list entries", |
| __func__, (unsigned long)msfr.msfr_nsrcs); |
| kss = bsd_malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs, M_TEMP, M_WAITOK); |
| error = copyin(msfr.msfr_srcs, kss, |
| sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs); |
| if (error) { |
| bsd_free(kss, M_TEMP); |
| return (error); |
| } |
| |
| INP_WLOCK(inp); |
| |
| /* |
| * Mark all source filters as UNDEFINED at t1. |
| * Restore new group filter mode, as imf_leave() |
| * will set it to INCLUDE. |
| */ |
| imf_leave(imf); |
| imf->imf_st[1] = msfr.msfr_fmode; |
| |
| /* |
| * Update socket layer filters at t1, lazy-allocating |
| * new entries. This saves a bunch of memory at the |
| * cost of one RB_FIND() per source entry; duplicate |
| * entries in the msfr_nsrcs vector are ignored. |
| * If we encounter an error, rollback transaction. |
| * |
| * XXX This too could be replaced with a set-symmetric |
| * difference like loop to avoid walking from root |
| * every time, as the key space is common. |
| */ |
| for (i = 0, pkss = kss; i < msfr.msfr_nsrcs; i++, pkss++) { |
| psin = (struct sockaddr_in *)pkss; |
| if (psin->sin_family != AF_INET) { |
| error = EAFNOSUPPORT; |
| break; |
| } |
| if (psin->sin_len != sizeof(struct sockaddr_in)) { |
| error = EINVAL; |
| break; |
| } |
| error = imf_get_source(imf, psin, &lims); |
| if (error) |
| break; |
| lims->imsl_st[1] = imf->imf_st[1]; |
| } |
| bsd_free(kss, M_TEMP); |
| } |
| |
| if (error) |
| goto out_imf_rollback; |
| |
| INP_WLOCK_ASSERT(inp); |
| IN_MULTI_LOCK(); |
| |
| /* |
| * Begin state merge transaction at IGMP layer. |
| */ |
| CTR1(KTR_IGMPV3, "%s: merge inm state", __func__); |
| error = inm_merge(inm, imf); |
| if (error) { |
| CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__); |
| goto out_imf_rollback; |
| } |
| |
| CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__); |
| error = igmp_change_state(inm); |
| if (error) |
| CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__); |
| |
| IN_MULTI_UNLOCK(); |
| |
| out_imf_rollback: |
| if (error) |
| imf_rollback(imf); |
| else |
| imf_commit(imf); |
| |
| imf_reap(imf); |
| |
| out_inp_locked: |
| INP_WUNLOCK(inp); |
| return (error); |
| } |
| |
| /* |
| * Set the IP multicast options in response to user setsockopt(). |
| * |
| * Many of the socket options handled in this function duplicate the |
| * functionality of socket options in the regular unicast API. However, |
| * it is not possible to merge the duplicate code, because the idempotence |
| * of the IPv4 multicast part of the BSD Sockets API must be preserved; |
| * the effects of these options must be treated as separate and distinct. |
| * |
| * SMPng: XXX: Unlocked read of inp_socket believed OK. |
| * FUTURE: The IP_MULTICAST_VIF option may be eliminated if MROUTING |
| * is refactored to no longer use vifs. |
| */ |
| int |
| inp_setmoptions(struct inpcb *inp, struct sockopt *sopt) |
| { |
| struct ip_moptions *imo; |
| int error; |
| |
| error = 0; |
| |
| /* |
| * If socket is neither of type SOCK_RAW or SOCK_DGRAM, |
| * or is a divert socket, reject it. |
| */ |
| if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT || |
| (inp->inp_socket->so_proto->pr_type != SOCK_RAW && |
| inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)) |
| return (EOPNOTSUPP); |
| |
| switch (sopt->sopt_name) { |
| case IP_MULTICAST_VIF: { |
| int vifi; |
| /* |
| * Select a multicast VIF for transmission. |
| * Only useful if multicast forwarding is active. |
| */ |
| if (legal_vif_num == NULL) { |
| error = EOPNOTSUPP; |
| break; |
| } |
| error = sooptcopyin(sopt, &vifi, sizeof(int), sizeof(int)); |
| if (error) |
| break; |
| if (!legal_vif_num(vifi) && (vifi != -1)) { |
| error = EINVAL; |
| break; |
| } |
| imo = inp_findmoptions(inp); |
| imo->imo_multicast_vif = vifi; |
| INP_WUNLOCK(inp); |
| break; |
| } |
| |
| case IP_MULTICAST_IF: |
| error = inp_set_multicast_if(inp, sopt); |
| break; |
| |
| case IP_MULTICAST_TTL: { |
| u_char ttl; |
| |
| /* |
| * Set the IP time-to-live for outgoing multicast packets. |
| * The original multicast API required a char argument, |
| * which is inconsistent with the rest of the socket API. |
| * We allow either a char or an int. |
| */ |
| if (sopt->sopt_valsize == sizeof(u_char)) { |
| error = sooptcopyin(sopt, &ttl, sizeof(u_char), |
| sizeof(u_char)); |
| if (error) |
| break; |
| } else { |
| u_int ittl; |
| |
| error = sooptcopyin(sopt, &ittl, sizeof(u_int), |
| sizeof(u_int)); |
| if (error) |
| break; |
| if (ittl > 255) { |
| error = EINVAL; |
| break; |
| } |
| ttl = (u_char)ittl; |
| } |
| imo = inp_findmoptions(inp); |
| imo->imo_multicast_ttl = ttl; |
| INP_WUNLOCK(inp); |
| break; |
| } |
| |
| case IP_MULTICAST_LOOP: { |
| u_char loop; |
| |
| /* |
| * Set the loopback flag for outgoing multicast packets. |
| * Must be zero or one. The original multicast API required a |
| * char argument, which is inconsistent with the rest |
| * of the socket API. We allow either a char or an int. |
| */ |
| if (sopt->sopt_valsize == sizeof(u_char)) { |
| error = sooptcopyin(sopt, &loop, sizeof(u_char), |
| sizeof(u_char)); |
| if (error) |
| break; |
| } else { |
| u_int iloop; |
| |
| error = sooptcopyin(sopt, &iloop, sizeof(u_int), |
| sizeof(u_int)); |
| if (error) |
| break; |
| loop = (u_char)iloop; |
| } |
| imo = inp_findmoptions(inp); |
| imo->imo_multicast_loop = !!loop; |
| INP_WUNLOCK(inp); |
| break; |
| } |
| |
| case IP_ADD_MEMBERSHIP: |
| case IP_ADD_SOURCE_MEMBERSHIP: |
| case MCAST_JOIN_GROUP: |
| case MCAST_JOIN_SOURCE_GROUP: |
| error = inp_join_group(inp, sopt); |
| break; |
| |
| case IP_DROP_MEMBERSHIP: |
| case IP_DROP_SOURCE_MEMBERSHIP: |
| case MCAST_LEAVE_GROUP: |
| case MCAST_LEAVE_SOURCE_GROUP: |
| error = inp_leave_group(inp, sopt); |
| break; |
| |
| case IP_BLOCK_SOURCE: |
| case IP_UNBLOCK_SOURCE: |
| case MCAST_BLOCK_SOURCE: |
| case MCAST_UNBLOCK_SOURCE: |
| error = inp_block_unblock_source(inp, sopt); |
| break; |
| |
| case IP_MSFILTER: |
| error = inp_set_source_filters(inp, sopt); |
| break; |
| |
| default: |
| error = EOPNOTSUPP; |
| break; |
| } |
| |
| INP_UNLOCK_ASSERT(inp); |
| |
| return (error); |
| } |
| |
| /* |
| * Expose IGMP's multicast filter mode and source list(s) to userland, |
| * keyed by (ifindex, group). |
| * The filter mode is written out as a uint32_t, followed by |
| * 0..n of struct in_addr. |
| * For use by ifmcstat(8). |
| * SMPng: NOTE: unlocked read of ifindex space. |
| */ |
| /* |
| static int |
| sysctl_ip_mcast_filters(SYSCTL_HANDLER_ARGS) |
| { |
| struct in_addr src, group; |
| struct ifnet *ifp; |
| struct ifmultiaddr *ifma; |
| struct in_multi *inm; |
| struct ip_msource *ims; |
| int *name; |
| int retval; |
| u_int namelen; |
| uint32_t fmode, ifindex; |
| |
| name = (int *)arg1; |
| namelen = arg2; |
| |
| if (req->newptr != NULL) |
| return (EPERM); |
| |
| if (namelen != 2) |
| return (EINVAL); |
| |
| ifindex = name[0]; |
| if (ifindex <= 0 || ifindex > V_if_index) { |
| CTR2(KTR_IGMPV3, "%s: ifindex %u out of range", |
| __func__, ifindex); |
| return (ENOENT); |
| } |
| |
| group.s_addr = name[1]; |
| if (!IN_MULTICAST(ntohl(group.s_addr))) { |
| CTR2(KTR_IGMPV3, "%s: group %s is not multicast", |
| __func__, inet_ntoa(group)); |
| return (EINVAL); |
| } |
| |
| ifp = ifnet_byindex(ifindex); |
| if (ifp == NULL) { |
| CTR2(KTR_IGMPV3, "%s: no ifp for ifindex %u", |
| __func__, ifindex); |
| return (ENOENT); |
| } |
| |
| retval = sysctl_wire_old_buffer(req, |
| sizeof(uint32_t) + (in_mcast_maxgrpsrc * sizeof(struct in_addr))); |
| if (retval) |
| return (retval); |
| |
| IN_MULTI_LOCK(); |
| |
| IF_ADDR_LOCK(ifp); |
| TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { |
| if (ifma->ifma_addr->sa_family != AF_INET || |
| ifma->ifma_protospec == NULL) |
| continue; |
| inm = (struct in_multi *)ifma->ifma_protospec; |
| if (!in_hosteq(inm->inm_addr, group)) |
| continue; |
| fmode = inm->inm_st[1].iss_fmode; |
| retval = SYSCTL_OUT(req, &fmode, sizeof(uint32_t)); |
| if (retval != 0) |
| break; |
| RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) { |
| #ifdef KTR |
| struct in_addr ina; |
| ina.s_addr = htonl(ims->ims_haddr); |
| CTR2(KTR_IGMPV3, "%s: visit node %s", __func__, |
| inet_ntoa(ina)); |
| #endif |
| *//* |
| * Only copy-out sources which are in-mode. |
| *//* |
| if (fmode != ims_get_mode(inm, ims, 1)) { |
| CTR1(KTR_IGMPV3, "%s: skip non-in-mode", |
| __func__); |
| continue; |
| } |
| src.s_addr = htonl(ims->ims_haddr); |
| retval = SYSCTL_OUT(req, &src, sizeof(struct in_addr)); |
| if (retval != 0) |
| break; |
| } |
| } |
| IF_ADDR_UNLOCK(ifp); |
| |
| IN_MULTI_UNLOCK(); |
| |
| return (retval); |
| } |
| */ |
| |
| #ifdef KTR |
| |
| static const char *inm_modestrs[] = { "un", "in", "ex" }; |
| |
| static const char * |
| inm_mode_str(const int mode) |
| { |
| |
| if (mode >= MCAST_UNDEFINED && mode <= MCAST_EXCLUDE) |
| return (inm_modestrs[mode]); |
| return ("??"); |
| } |
| |
| static const char *inm_statestrs[] = { |
| "not-member", |
| "silent", |
| "idle", |
| "lazy", |
| "sleeping", |
| "awakening", |
| "query-pending", |
| "sg-query-pending", |
| "leaving" |
| }; |
| |
| static const char * |
| inm_state_str(const int state) |
| { |
| |
| if (state >= IGMP_NOT_MEMBER && state <= IGMP_LEAVING_MEMBER) |
| return (inm_statestrs[state]); |
| return ("??"); |
| } |
| |
| /* |
| * Dump an in_multi structure to the console. |
| */ |
| void |
| inm_print(const struct in_multi *inm) |
| { |
| int t; |
| |
| if ((ktr_mask & KTR_IGMPV3) == 0) |
| return; |
| |
| printf("%s: --- begin inm %p ---\n", __func__, inm); |
| printf("addr %s ifp %p(%s) ifma %p\n", |
| inet_ntoa(inm->inm_addr), |
| inm->inm_ifp, |
| inm->inm_ifp->if_xname, |
| inm->inm_ifma); |
| printf("timer %u state %s refcount %u scq.len %u\n", |
| inm->inm_timer, |
| inm_state_str(inm->inm_state), |
| inm->inm_refcount, |
| inm->inm_scq.ifq_len); |
| printf("igi %p nsrc %lu sctimer %u scrv %u\n", |
| inm->inm_igi, |
| inm->inm_nsrc, |
| inm->inm_sctimer, |
| inm->inm_scrv); |
| for (t = 0; t < 2; t++) { |
| printf("t%d: fmode %s asm %u ex %u in %u rec %u\n", t, |
| inm_mode_str(inm->inm_st[t].iss_fmode), |
| inm->inm_st[t].iss_asm, |
| inm->inm_st[t].iss_ex, |
| inm->inm_st[t].iss_in, |
| inm->inm_st[t].iss_rec); |
| } |
| printf("%s: --- end inm %p ---\n", __func__, inm); |
| } |
| |
| #else /* !KTR */ |
| |
| void |
| inm_print(const struct in_multi *inm) |
| { |
| |
| } |
| |
| #endif /* KTR */ |
| |
| RB_GENERATE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp); |