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freebsd-skq/sys/netinet/in_mcast.c
Bruce M Simpson 933fc4dde6 Fix a few issues related to the legacy 4.4 BSD multicast APIs. 
IPv4 addresses can and do change during normal operation. Testing by
pfSense developers exposed an issue where OpenOSPFD was using the IPv4
address to leave the OSPF link-scope multicast groups on a dynamic
OpenVPN tun interface, rather than using RFC 3678 with the interface
index, which won't be raced when the interface's addresses change.

In inp_join_group():
 If we are already a member of an ASM group, and IP_ADD_MEMBERSHIP or
 MCAST_JOIN_GROUP ioctls are re-issued, return EADDRINUSE as per the
 legacy 4.4BSD multicast API. This bends RFC 3678 slightly, but does
 not violate POLA for apps using the old API.
 It also stops us falling through to kicking IGMP state transactions
 in what is otherwise a no-op case.
 [This has already been dealt with in HEAD, but make it explicit before
  we MFC the change to 8.]

In inp_leave_group():
 Fix a bogus conditional.
 Move the ifp null check to ioctls MCAST_LEAVE* in the switch..case
 where it actually belongs.
 If an interface was specified, by primary IPv4 address, for ioctl
 IP_DROP_MEMBERSHIP or MCAST_LEAVE_GROUP (an ASM full leave operation),
 then and only then should we look up the ifp from the IPv4 address in
 mreqs.imr_interface.
 If not, we fall through to imo_match_group() as before, but only in
 the IP_DROP_MEMBERSHIP case.

With these changes, the legacy 4.4BSD multicast API idempotence should
be mostly preserved in the SSM enabled IPv4 stack.

Found by:	ermal (with pfSense)
MFC after:	3 days
2010-04-10 12:05:31 +00:00

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/*-
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>
#include <sys/ktr.h>
#include <sys/tree.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/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 *);
static 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 **)realloc(omships,
sizeof(struct in_multi *) * newmax, M_IPMOPTS, M_NOWAIT);
nmfilters = (struct in_mfilter *)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)
free(nmships, M_IPMOPTS);
if (nmfilters != NULL)
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 = 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);
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 = 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 = 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 = 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);
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);
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);
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 = 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);
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);
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 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 = malloc(sizeof(*imo), M_IPMOPTS, M_WAITOK);
immp = malloc(sizeof(*immp) * IP_MIN_MEMBERSHIPS, M_IPMOPTS,
M_WAITOK | M_ZERO);
imfp = 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) {
free(imfp, M_INMFILTER);
free(immp, M_IPMOPTS);
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)
free(imo->imo_mfilters, M_INMFILTER);
free(imo->imo_membership, M_IPMOPTS);
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 = 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);
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;
lims = 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.
*
* XXX FIXME: This makes a naive assumption that
* even if entries exist for *ssa in this imf,
* they will be rejected as dupes, even if they
* are not valid in the current mode (in-mode).
*
* in_msource is transactioned just as for anything
* else in SSM -- but note naive use of inm_graft()
* below for allocating new filter entries.
*
* This is only an issue if someone mixes the
* full-state SSM API with the delta-based API,
* which is discouraged in the relevant RFCs.
*/
lims = imo_match_source(imo, idx, &ssa->sa);
if (lims != NULL /*&&
lims->imsl_st[1] == MCAST_INCLUDE*/) {
error = EADDRNOTAVAIL;
goto out_inp_locked;
}
} else {
/*
* MCAST_JOIN_GROUP on an existing exclusive
* membership is an error; return EADDRINUSE
* to preserve 4.4BSD API idempotence, and
* avoid tedious detour to code below.
* NOTE: This is bending RFC 3678 a bit.
*
* On an existing inclusive membership, this is also
* an error; if you want to change filter mode,
* you must use the userland API setsourcefilter().
* XXX We don't reject this for imf in UNDEFINED
* state at t1, because allocation of a filter
* is atomic with allocation of a membership.
*/
error = EINVAL;
if (imf->imf_st[1] == MCAST_EXCLUDE)
error = EADDRINUSE;
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.
*
* Note: Grafting of exclusive mode filters doesn't happen
* in this path.
* XXX: Should check for non-NULL lims (node exists but may
* not be in-mode) for interop with full-state API.
*/
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;
}
/*
* Attempt to look up hinted ifp from interface address.
* Fallthrough with null ifp iff lookup fails, to
* preserve 4.4BSD mcast API idempotence.
* XXX NOTE WELL: The RFC 3678 API is preferred because
* using an IPv4 address as a key is racy.
*/
if (!in_nullhost(mreqs.imr_interface))
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);
if (ifp == NULL)
return (EADDRNOTAVAIL);
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);
/*
* 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 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)
return (ENOBUFS);
if ((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 = 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) {
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];
}
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);
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