version 1.51.6.1, 2011/06/06 09:10:00 |
version 1.96, 2018/05/29 04:37:58 |
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#include <sys/cdefs.h> |
#include <sys/cdefs.h> |
__KERNEL_RCSID(0, "$NetBSD$"); |
__KERNEL_RCSID(0, "$NetBSD$"); |
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#ifdef _KERNEL_OPT |
#include "opt_inet.h" |
#include "opt_inet.h" |
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#include "opt_net_mpsafe.h" |
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#endif |
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#include <sys/param.h> |
#include <sys/param.h> |
#include <sys/systm.h> |
#include <sys/systm.h> |
#include <sys/mbuf.h> |
#include <sys/mbuf.h> |
#include <sys/socket.h> |
#include <sys/socket.h> |
#include <sys/socketvar.h> |
#include <sys/socketvar.h> |
#include <sys/protosw.h> |
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#include <sys/syslog.h> |
#include <sys/syslog.h> |
#include <sys/sysctl.h> |
#include <sys/sysctl.h> |
#include <sys/kernel.h> |
#include <sys/kernel.h> |
#include <sys/callout.h> |
#include <sys/callout.h> |
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#include <sys/cprng.h> |
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#include <sys/rwlock.h> |
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#include <net/if.h> |
#include <net/if.h> |
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Line 129 __KERNEL_RCSID(0, "$NetBSD$"); |
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Line 133 __KERNEL_RCSID(0, "$NetBSD$"); |
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#include <netinet6/icmp6_private.h> |
#include <netinet6/icmp6_private.h> |
#include <netinet6/mld6_var.h> |
#include <netinet6/mld6_var.h> |
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#include <net/net_osdep.h> |
static krwlock_t in6_multilock __cacheline_aligned; |
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/* |
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* This structure is used to keep track of in6_multi chains which belong to |
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* deleted interface addresses. |
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*/ |
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static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */ |
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struct multi6_kludge { |
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LIST_ENTRY(multi6_kludge) mk_entry; |
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struct ifnet *mk_ifp; |
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struct in6_multihead mk_head; |
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}; |
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/* |
/* |
* Protocol constants |
* Protocol constants |
Line 160 static struct ip6_pktopts ip6_opts; |
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Line 150 static struct ip6_pktopts ip6_opts; |
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static void mld_start_listening(struct in6_multi *); |
static void mld_start_listening(struct in6_multi *); |
static void mld_stop_listening(struct in6_multi *); |
static void mld_stop_listening(struct in6_multi *); |
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static struct mld_hdr * mld_allocbuf(struct mbuf **, int, struct in6_multi *, |
static struct mld_hdr *mld_allocbuf(struct mbuf **, struct in6_multi *, int); |
int); |
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static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *); |
static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *); |
static void mld_starttimer(struct in6_multi *); |
static void mld_starttimer(struct in6_multi *); |
static void mld_stoptimer(struct in6_multi *); |
static void mld_stoptimer(struct in6_multi *); |
static u_long mld_timerresid(struct in6_multi *); |
static u_long mld_timerresid(struct in6_multi *); |
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static void in6m_ref(struct in6_multi *); |
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static void in6m_unref(struct in6_multi *); |
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static void in6m_destroy(struct in6_multi *); |
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void |
void |
mld_init(void) |
mld_init(void) |
{ |
{ |
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ip6_opts.ip6po_hbh = hbh; |
ip6_opts.ip6po_hbh = hbh; |
/* We will specify the hoplimit by a multicast option. */ |
/* We will specify the hoplimit by a multicast option. */ |
ip6_opts.ip6po_hlim = -1; |
ip6_opts.ip6po_hlim = -1; |
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ip6_opts.ip6po_prefer_tempaddr = IP6PO_TEMPADDR_NOTPREFER; |
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rw_init(&in6_multilock); |
} |
} |
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static void |
static void |
Line 194 mld_starttimer(struct in6_multi *in6m) |
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Line 190 mld_starttimer(struct in6_multi *in6m) |
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{ |
{ |
struct timeval now; |
struct timeval now; |
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KASSERT(rw_write_held(&in6_multilock)); |
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KASSERT(in6m->in6m_timer != IN6M_TIMER_UNDEF); |
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microtime(&now); |
microtime(&now); |
in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz; |
in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz; |
in6m->in6m_timer_expire.tv_usec = now.tv_usec + |
in6m->in6m_timer_expire.tv_usec = now.tv_usec + |
Line 207 mld_starttimer(struct in6_multi *in6m) |
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Line 206 mld_starttimer(struct in6_multi *in6m) |
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callout_schedule(&in6m->in6m_timer_ch, in6m->in6m_timer); |
callout_schedule(&in6m->in6m_timer_ch, in6m->in6m_timer); |
} |
} |
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/* |
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* mld_stoptimer releases in6_multilock when calling callout_halt. |
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* The caller must ensure in6m won't be freed while releasing the lock. |
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*/ |
static void |
static void |
mld_stoptimer(struct in6_multi *in6m) |
mld_stoptimer(struct in6_multi *in6m) |
{ |
{ |
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KASSERT(rw_write_held(&in6_multilock)); |
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if (in6m->in6m_timer == IN6M_TIMER_UNDEF) |
if (in6m->in6m_timer == IN6M_TIMER_UNDEF) |
return; |
return; |
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callout_stop(&in6m->in6m_timer_ch); |
rw_exit(&in6_multilock); |
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callout_halt(&in6m->in6m_timer_ch, NULL); |
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rw_enter(&in6_multilock, RW_WRITER); |
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in6m->in6m_timer = IN6M_TIMER_UNDEF; |
in6m->in6m_timer = IN6M_TIMER_UNDEF; |
} |
} |
Line 223 mld_timeo(void *arg) |
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Line 233 mld_timeo(void *arg) |
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{ |
{ |
struct in6_multi *in6m = arg; |
struct in6_multi *in6m = arg; |
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mutex_enter(softnet_lock); |
KASSERT(in6m->in6m_refcount > 0); |
KERNEL_LOCK(1, NULL); |
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KERNEL_LOCK_UNLESS_NET_MPSAFE(); |
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rw_enter(&in6_multilock, RW_WRITER); |
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if (in6m->in6m_timer == IN6M_TIMER_UNDEF) |
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goto out; |
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in6m->in6m_timer = IN6M_TIMER_UNDEF; |
in6m->in6m_timer = IN6M_TIMER_UNDEF; |
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Line 237 mld_timeo(void *arg) |
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Line 251 mld_timeo(void *arg) |
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break; |
break; |
} |
} |
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KERNEL_UNLOCK_ONE(NULL); |
out: |
mutex_exit(softnet_lock); |
rw_exit(&in6_multilock); |
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KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); |
} |
} |
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static u_long |
static u_long |
Line 270 mld_start_listening(struct in6_multi *in |
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Line 285 mld_start_listening(struct in6_multi *in |
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{ |
{ |
struct in6_addr all_in6; |
struct in6_addr all_in6; |
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KASSERT(rw_write_held(&in6_multilock)); |
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/* |
/* |
* RFC2710 page 10: |
* RFC2710 page 10: |
* The node never sends a Report or Done for the link-scope all-nodes |
* The node never sends a Report or Done for the link-scope all-nodes |
Line 289 mld_start_listening(struct in6_multi *in |
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Line 306 mld_start_listening(struct in6_multi *in |
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in6m->in6m_state = MLD_OTHERLISTENER; |
in6m->in6m_state = MLD_OTHERLISTENER; |
} else { |
} else { |
mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); |
mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); |
in6m->in6m_timer = arc4random() % |
in6m->in6m_timer = cprng_fast32() % |
(MLD_UNSOLICITED_REPORT_INTERVAL * hz); |
(MLD_UNSOLICITED_REPORT_INTERVAL * hz); |
in6m->in6m_state = MLD_IREPORTEDLAST; |
in6m->in6m_state = MLD_IREPORTEDLAST; |
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Line 302 mld_stop_listening(struct in6_multi *in6 |
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Line 319 mld_stop_listening(struct in6_multi *in6 |
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{ |
{ |
struct in6_addr allnode, allrouter; |
struct in6_addr allnode, allrouter; |
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KASSERT(rw_lock_held(&in6_multilock)); |
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allnode = in6addr_linklocal_allnodes; |
allnode = in6addr_linklocal_allnodes; |
if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { |
if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { |
/* XXX: this should not happen! */ |
/* XXX: this should not happen! */ |
Line 326 mld_input(struct mbuf *m, int off) |
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Line 345 mld_input(struct mbuf *m, int off) |
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{ |
{ |
struct ip6_hdr *ip6; |
struct ip6_hdr *ip6; |
struct mld_hdr *mldh; |
struct mld_hdr *mldh; |
struct ifnet *ifp = m->m_pkthdr.rcvif; |
struct ifnet *ifp; |
struct in6_multi *in6m = NULL; |
struct in6_multi *in6m = NULL; |
struct in6_addr mld_addr, all_in6; |
struct in6_addr mld_addr, all_in6; |
struct in6_ifaddr *ia; |
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u_long timer = 0; /* timer value in the MLD query header */ |
u_long timer = 0; /* timer value in the MLD query header */ |
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struct psref psref; |
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ifp = m_get_rcvif_psref(m, &psref); |
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if (__predict_false(ifp == NULL)) |
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goto out; |
IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); |
IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); |
if (mldh == NULL) { |
if (mldh == NULL) { |
ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
return; |
goto out_nodrop; |
} |
} |
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ip6 = mtod(m, struct ip6_hdr *); |
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/* source address validation */ |
/* source address validation */ |
ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */ |
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if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { |
if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { |
/* |
/* |
* RFC3590 allows the IPv6 unspecified address as the source |
* RFC3590 allows the IPv6 unspecified address as the source |
Line 361 mld_input(struct mbuf *m, int off) |
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Line 384 mld_input(struct mbuf *m, int off) |
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* though RFC3590 says "SHOULD log" if the source of a query |
* though RFC3590 says "SHOULD log" if the source of a query |
* is the unspecified address. |
* is the unspecified address. |
*/ |
*/ |
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char ip6bufs[INET6_ADDRSTRLEN]; |
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char ip6bufm[INET6_ADDRSTRLEN]; |
log(LOG_INFO, |
log(LOG_INFO, |
"mld_input: src %s is not link-local (grp=%s)\n", |
"mld_input: src %s is not link-local (grp=%s)\n", |
ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr)); |
IN6_PRINT(ip6bufs,&ip6->ip6_src), |
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IN6_PRINT(ip6bufm, &mldh->mld_addr)); |
#endif |
#endif |
m_freem(m); |
goto out; |
return; |
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} |
} |
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/* |
/* |
Line 375 mld_input(struct mbuf *m, int off) |
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Line 400 mld_input(struct mbuf *m, int off) |
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mld_addr = mldh->mld_addr; |
mld_addr = mldh->mld_addr; |
if (in6_setscope(&mld_addr, ifp, NULL)) { |
if (in6_setscope(&mld_addr, ifp, NULL)) { |
/* XXX: this should not happen! */ |
/* XXX: this should not happen! */ |
m_free(m); |
goto out; |
return; |
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} |
} |
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/* |
/* |
Line 384 mld_input(struct mbuf *m, int off) |
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Line 408 mld_input(struct mbuf *m, int off) |
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* |
* |
* In Non-Listener state, we simply don't have a membership record. |
* In Non-Listener state, we simply don't have a membership record. |
* In Delaying Listener state, our timer is running (in6m->in6m_timer) |
* In Delaying Listener state, our timer is running (in6m->in6m_timer) |
* In Idle Listener state, our timer is not running |
* In Idle Listener state, our timer is not running |
* (in6m->in6m_timer==IN6M_TIMER_UNDEF) |
* (in6m->in6m_timer==IN6M_TIMER_UNDEF) |
* |
* |
* The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if |
* The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if |
Line 392 mld_input(struct mbuf *m, int off) |
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Line 416 mld_input(struct mbuf *m, int off) |
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* if we sent the last report. |
* if we sent the last report. |
*/ |
*/ |
switch (mldh->mld_type) { |
switch (mldh->mld_type) { |
case MLD_LISTENER_QUERY: |
case MLD_LISTENER_QUERY: { |
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struct in6_multi *next; |
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if (ifp->if_flags & IFF_LOOPBACK) |
if (ifp->if_flags & IFF_LOOPBACK) |
break; |
break; |
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Line 418 mld_input(struct mbuf *m, int off) |
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Line 444 mld_input(struct mbuf *m, int off) |
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*/ |
*/ |
timer = ntohs(mldh->mld_maxdelay); |
timer = ntohs(mldh->mld_maxdelay); |
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IFP_TO_IA6(ifp, ia); |
rw_enter(&in6_multilock, RW_WRITER); |
if (ia == NULL) |
/* |
break; |
* mld_stoptimer and mld_sendpkt release in6_multilock |
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* temporarily, so we have to prevent in6m from being freed |
LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) { |
* while releasing the lock by having an extra reference to it. |
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* |
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* Also in6_purge_multi might remove items from the list of the |
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* ifp while releasing the lock. Fortunately in6_purge_multi is |
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* never executed as long as we have a psref of the ifp. |
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*/ |
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LIST_FOREACH_SAFE(in6m, &ifp->if_multiaddrs, in6m_entry, next) { |
if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || |
if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || |
IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < |
IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < |
IPV6_ADDR_SCOPE_LINKLOCAL) |
IPV6_ADDR_SCOPE_LINKLOCAL) |
Line 436 mld_input(struct mbuf *m, int off) |
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Line 468 mld_input(struct mbuf *m, int off) |
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continue; |
continue; |
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if (timer == 0) { |
if (timer == 0) { |
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in6m_ref(in6m); |
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/* send a report immediately */ |
/* send a report immediately */ |
mld_stoptimer(in6m); |
mld_stoptimer(in6m); |
mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); |
mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); |
in6m->in6m_state = MLD_IREPORTEDLAST; |
in6m->in6m_state = MLD_IREPORTEDLAST; |
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in6m_unref(in6m); /* May free in6m */ |
} else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || |
} else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || |
mld_timerresid(in6m) > timer) { |
mld_timerresid(in6m) > timer) { |
in6m->in6m_timer = |
in6m->in6m_timer = |
1 + (arc4random() % timer) * hz / 1000; |
1 + (cprng_fast32() % timer) * hz / 1000; |
mld_starttimer(in6m); |
mld_starttimer(in6m); |
} |
} |
} |
} |
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rw_exit(&in6_multilock); |
break; |
break; |
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} |
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case MLD_LISTENER_REPORT: |
case MLD_LISTENER_REPORT: |
/* |
/* |
Line 469 mld_input(struct mbuf *m, int off) |
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Line 507 mld_input(struct mbuf *m, int off) |
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* If we belong to the group being reported, stop |
* If we belong to the group being reported, stop |
* our timer for that group. |
* our timer for that group. |
*/ |
*/ |
IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); |
rw_enter(&in6_multilock, RW_WRITER); |
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in6m = in6_lookup_multi(&mld_addr, ifp); |
if (in6m) { |
if (in6m) { |
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in6m_ref(in6m); |
mld_stoptimer(in6m); /* transit to idle state */ |
mld_stoptimer(in6m); /* transit to idle state */ |
in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ |
in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ |
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in6m_unref(in6m); |
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in6m = NULL; /* in6m might be freed */ |
} |
} |
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rw_exit(&in6_multilock); |
break; |
break; |
default: /* this is impossible */ |
default: /* this is impossible */ |
#if 0 |
#if 0 |
Line 487 mld_input(struct mbuf *m, int off) |
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Line 530 mld_input(struct mbuf *m, int off) |
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break; |
break; |
} |
} |
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out: |
m_freem(m); |
m_freem(m); |
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out_nodrop: |
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m_put_rcvif_psref(ifp, &psref); |
} |
} |
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/* |
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* XXX mld_sendpkt must be called with in6_multilock held and |
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* will release in6_multilock before calling ip6_output and |
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* returning to avoid locking against myself in ip6_output. |
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*/ |
static void |
static void |
mld_sendpkt(struct in6_multi *in6m, int type, |
mld_sendpkt(struct in6_multi *in6m, int type, const struct in6_addr *dst) |
const struct in6_addr *dst) |
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{ |
{ |
struct mbuf *mh; |
struct mbuf *mh; |
struct mld_hdr *mldh; |
struct mld_hdr *mldh; |
Line 501 mld_sendpkt(struct in6_multi *in6m, int |
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Line 551 mld_sendpkt(struct in6_multi *in6m, int |
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struct in6_ifaddr *ia = NULL; |
struct in6_ifaddr *ia = NULL; |
struct ifnet *ifp = in6m->in6m_ifp; |
struct ifnet *ifp = in6m->in6m_ifp; |
int ignflags; |
int ignflags; |
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struct psref psref; |
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int bound; |
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KASSERT(rw_write_held(&in6_multilock)); |
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/* |
/* |
* At first, find a link local address on the outgoing interface |
* At first, find a link local address on the outgoing interface |
Line 509 mld_sendpkt(struct in6_multi *in6m, int |
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Line 563 mld_sendpkt(struct in6_multi *in6m, int |
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* the case where we first join a link-local address. |
* the case where we first join a link-local address. |
*/ |
*/ |
ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE; |
ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE; |
if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL) |
bound = curlwp_bind(); |
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ia = in6ifa_ifpforlinklocal_psref(ifp, ignflags, &psref); |
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if (ia == NULL) { |
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curlwp_bindx(bound); |
return; |
return; |
if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) |
} |
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if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { |
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ia6_release(ia, &psref); |
ia = NULL; |
ia = NULL; |
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} |
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/* Allocate two mbufs to store IPv6 header and MLD header */ |
/* Allocate two mbufs to store IPv6 header and MLD header */ |
mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type); |
mldh = mld_allocbuf(&mh, in6m, type); |
if (mldh == NULL) |
if (mldh == NULL) { |
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ia6_release(ia, &psref); |
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curlwp_bindx(bound); |
return; |
return; |
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} |
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/* fill src/dst here */ |
/* fill src/dst here */ |
ip6 = mtod(mh, struct ip6_hdr *); |
ip6 = mtod(mh, struct ip6_hdr *); |
ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any; |
ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any; |
ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; |
ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; |
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ia6_release(ia, &psref); |
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curlwp_bindx(bound); |
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mldh->mld_addr = in6m->in6m_addr; |
mldh->mld_addr = in6m->in6m_addr; |
in6_clearscope(&mldh->mld_addr); /* XXX */ |
in6_clearscope(&mldh->mld_addr); /* XXX */ |
Line 531 mld_sendpkt(struct in6_multi *in6m, int |
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Line 596 mld_sendpkt(struct in6_multi *in6m, int |
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/* construct multicast option */ |
/* construct multicast option */ |
memset(&im6o, 0, sizeof(im6o)); |
memset(&im6o, 0, sizeof(im6o)); |
im6o.im6o_multicast_ifp = ifp; |
im6o.im6o_multicast_if_index = if_get_index(ifp); |
im6o.im6o_multicast_hlim = 1; |
im6o.im6o_multicast_hlim = 1; |
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/* |
/* |
Line 540 mld_sendpkt(struct in6_multi *in6m, int |
|
Line 605 mld_sendpkt(struct in6_multi *in6m, int |
|
*/ |
*/ |
im6o.im6o_multicast_loop = (ip6_mrouter != NULL); |
im6o.im6o_multicast_loop = (ip6_mrouter != NULL); |
|
|
/* increment output statictics */ |
/* increment output statistics */ |
ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); |
ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); |
icmp6_ifstat_inc(ifp, ifs6_out_msg); |
icmp6_ifstat_inc(ifp, ifs6_out_msg); |
switch (type) { |
switch (type) { |
Line 555 mld_sendpkt(struct in6_multi *in6m, int |
|
Line 620 mld_sendpkt(struct in6_multi *in6m, int |
|
break; |
break; |
} |
} |
|
|
|
/* XXX we cannot call ip6_output with holding in6_multilock */ |
|
rw_exit(&in6_multilock); |
|
|
ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, |
ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, |
&im6o, (struct socket *)NULL, NULL); |
&im6o, NULL, NULL); |
|
|
|
rw_enter(&in6_multilock, RW_WRITER); |
} |
} |
|
|
static struct mld_hdr * |
static struct mld_hdr * |
mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m, |
mld_allocbuf(struct mbuf **mh, struct in6_multi *in6m, int type) |
int type) |
|
{ |
{ |
struct mbuf *md; |
struct mbuf *md; |
struct mld_hdr *mldh; |
struct mld_hdr *mldh; |
Line 584 mld_allocbuf(struct mbuf **mh, int len, |
|
Line 653 mld_allocbuf(struct mbuf **mh, int len, |
|
(*mh)->m_next = md; |
(*mh)->m_next = md; |
md->m_next = NULL; |
md->m_next = NULL; |
|
|
(*mh)->m_pkthdr.rcvif = NULL; |
m_reset_rcvif((*mh)); |
(*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len; |
(*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); |
(*mh)->m_len = sizeof(struct ip6_hdr); |
(*mh)->m_len = sizeof(struct ip6_hdr); |
MH_ALIGN(*mh, sizeof(struct ip6_hdr)); |
MH_ALIGN(*mh, sizeof(struct ip6_hdr)); |
|
|
Line 601 mld_allocbuf(struct mbuf **mh, int len, |
|
Line 670 mld_allocbuf(struct mbuf **mh, int len, |
|
/* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */ |
/* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */ |
|
|
/* fill in the MLD header as much as possible */ |
/* fill in the MLD header as much as possible */ |
md->m_len = len; |
md->m_len = sizeof(struct mld_hdr); |
mldh = mtod(md, struct mld_hdr *); |
mldh = mtod(md, struct mld_hdr *); |
memset(mldh, 0, len); |
memset(mldh, 0, sizeof(struct mld_hdr)); |
mldh->mld_type = type; |
mldh->mld_type = type; |
return mldh; |
return mldh; |
} |
} |
|
|
|
static void |
|
in6m_ref(struct in6_multi *in6m) |
|
{ |
|
|
|
KASSERT(rw_write_held(&in6_multilock)); |
|
in6m->in6m_refcount++; |
|
} |
|
|
|
static void |
|
in6m_unref(struct in6_multi *in6m) |
|
{ |
|
|
|
KASSERT(rw_write_held(&in6_multilock)); |
|
if (--in6m->in6m_refcount == 0) |
|
in6m_destroy(in6m); |
|
} |
|
|
/* |
/* |
* Add an address to the list of IP6 multicast addresses for a given interface. |
* Add an address to the list of IP6 multicast addresses for a given interface. |
*/ |
*/ |
struct in6_multi * |
struct in6_multi * |
in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, |
in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp, |
int *errorp, int timer) |
int timer) |
{ |
{ |
struct in6_ifaddr *ia; |
struct sockaddr_in6 sin6; |
struct in6_ifreq ifr; |
|
struct in6_multi *in6m; |
struct in6_multi *in6m; |
int s = splsoftnet(); |
|
|
|
*errorp = 0; |
*errorp = 0; |
|
|
|
rw_enter(&in6_multilock, RW_WRITER); |
/* |
/* |
* See if address already in list. |
* See if address already in list. |
*/ |
*/ |
IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); |
in6m = in6_lookup_multi(maddr6, ifp); |
if (in6m != NULL) { |
if (in6m != NULL) { |
/* |
/* |
* Found it; just increment the refrence count. |
* Found it; just increment the reference count. |
*/ |
*/ |
in6m->in6m_refcount++; |
in6m->in6m_refcount++; |
} else { |
} else { |
Line 636 in6_addmulti(struct in6_addr *maddr6, st |
|
Line 721 in6_addmulti(struct in6_addr *maddr6, st |
|
* New address; allocate a new multicast record |
* New address; allocate a new multicast record |
* and link it into the interface's multicast list. |
* and link it into the interface's multicast list. |
*/ |
*/ |
in6m = (struct in6_multi *) |
in6m = malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT|M_ZERO); |
malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT|M_ZERO); |
|
if (in6m == NULL) { |
if (in6m == NULL) { |
splx(s); |
|
*errorp = ENOBUFS; |
*errorp = ENOBUFS; |
return (NULL); |
goto out; |
} |
} |
|
|
in6m->in6m_addr = *maddr6; |
in6m->in6m_addr = *maddr6; |
in6m->in6m_ifp = ifp; |
in6m->in6m_ifp = ifp; |
in6m->in6m_refcount = 1; |
in6m->in6m_refcount = 1; |
in6m->in6m_timer = IN6M_TIMER_UNDEF; |
in6m->in6m_timer = IN6M_TIMER_UNDEF; |
IFP_TO_IA6(ifp, ia); |
callout_init(&in6m->in6m_timer_ch, CALLOUT_MPSAFE); |
if (ia == NULL) { |
callout_setfunc(&in6m->in6m_timer_ch, mld_timeo, in6m); |
free(in6m, M_IPMADDR); |
|
splx(s); |
LIST_INSERT_HEAD(&ifp->if_multiaddrs, in6m, in6m_entry); |
*errorp = EADDRNOTAVAIL; /* appropriate? */ |
|
return (NULL); |
|
} |
|
in6m->in6m_ia = ia; |
|
IFAREF(&ia->ia_ifa); /* gain a reference */ |
|
LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); |
|
|
|
/* |
/* |
* Ask the network driver to update its multicast reception |
* Ask the network driver to update its multicast reception |
* filter appropriately for the new address. |
* filter appropriately for the new address. |
*/ |
*/ |
sockaddr_in6_init(&ifr.ifr_addr, maddr6, 0, 0, 0); |
sockaddr_in6_init(&sin6, maddr6, 0, 0, 0); |
*errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, &ifr); |
*errorp = if_mcast_op(ifp, SIOCADDMULTI, sin6tosa(&sin6)); |
if (*errorp) { |
if (*errorp) { |
|
callout_destroy(&in6m->in6m_timer_ch); |
LIST_REMOVE(in6m, in6m_entry); |
LIST_REMOVE(in6m, in6m_entry); |
free(in6m, M_IPMADDR); |
free(in6m, M_IPMADDR); |
IFAFREE(&ia->ia_ifa); |
in6m = NULL; |
splx(s); |
goto out; |
return (NULL); |
|
} |
} |
|
|
callout_init(&in6m->in6m_timer_ch, CALLOUT_MPSAFE); |
|
callout_setfunc(&in6m->in6m_timer_ch, mld_timeo, in6m); |
|
in6m->in6m_timer = timer; |
in6m->in6m_timer = timer; |
if (in6m->in6m_timer > 0) { |
if (in6m->in6m_timer > 0) { |
in6m->in6m_state = MLD_REPORTPENDING; |
in6m->in6m_state = MLD_REPORTPENDING; |
mld_starttimer(in6m); |
mld_starttimer(in6m); |
|
goto out; |
splx(s); |
|
return (in6m); |
|
} |
} |
|
|
/* |
/* |
Line 690 in6_addmulti(struct in6_addr *maddr6, st |
|
Line 763 in6_addmulti(struct in6_addr *maddr6, st |
|
*/ |
*/ |
mld_start_listening(in6m); |
mld_start_listening(in6m); |
} |
} |
splx(s); |
out: |
return (in6m); |
rw_exit(&in6_multilock); |
|
return in6m; |
|
} |
|
|
|
static void |
|
in6m_destroy(struct in6_multi *in6m) |
|
{ |
|
struct sockaddr_in6 sin6; |
|
|
|
KASSERT(rw_write_held(&in6_multilock)); |
|
KASSERT(in6m->in6m_refcount == 0); |
|
|
|
/* |
|
* Unlink from list. This must be done before mld_stop_listening |
|
* because it releases in6_multilock and that allows someone to |
|
* look up the removing in6m from the list and add a reference to the |
|
* entry unexpectedly. |
|
*/ |
|
LIST_REMOVE(in6m, in6m_entry); |
|
|
|
/* |
|
* No remaining claims to this record; let MLD6 know |
|
* that we are leaving the multicast group. |
|
*/ |
|
mld_stop_listening(in6m); |
|
|
|
/* |
|
* Delete all references of this multicasting group from |
|
* the membership arrays |
|
*/ |
|
in6_purge_mcast_references(in6m); |
|
|
|
/* |
|
* Notify the network driver to update its multicast |
|
* reception filter. |
|
*/ |
|
sockaddr_in6_init(&sin6, &in6m->in6m_addr, 0, 0, 0); |
|
if_mcast_op(in6m->in6m_ifp, SIOCDELMULTI, sin6tosa(&sin6)); |
|
|
|
/* Tell mld_timeo we're halting the timer */ |
|
in6m->in6m_timer = IN6M_TIMER_UNDEF; |
|
|
|
rw_exit(&in6_multilock); |
|
callout_halt(&in6m->in6m_timer_ch, NULL); |
|
callout_destroy(&in6m->in6m_timer_ch); |
|
|
|
free(in6m, M_IPMADDR); |
|
rw_enter(&in6_multilock, RW_WRITER); |
} |
} |
|
|
/* |
/* |
* Delete a multicast address record. |
* Delete a multicast address record. |
*/ |
*/ |
void |
void |
in6_delmulti(struct in6_multi *in6m) |
in6_delmulti_locked(struct in6_multi *in6m) |
{ |
{ |
struct in6_ifreq ifr; |
|
struct in6_ifaddr *ia; |
|
int s = splsoftnet(); |
|
|
|
|
KASSERT(rw_write_held(&in6_multilock)); |
|
KASSERT(in6m->in6m_refcount > 0); |
|
|
|
/* |
|
* The caller should have a reference to in6m. So we don't need to care |
|
* of releasing the lock in mld_stoptimer. |
|
*/ |
mld_stoptimer(in6m); |
mld_stoptimer(in6m); |
|
if (--in6m->in6m_refcount == 0) |
|
in6m_destroy(in6m); |
|
} |
|
|
if (--in6m->in6m_refcount == 0) { |
void |
/* |
in6_delmulti(struct in6_multi *in6m) |
* No remaining claims to this record; let MLD6 know |
{ |
* that we are leaving the multicast group. |
|
*/ |
|
mld_stop_listening(in6m); |
|
|
|
/* |
rw_enter(&in6_multilock, RW_WRITER); |
* Unlink from list. |
in6_delmulti_locked(in6m); |
*/ |
rw_exit(&in6_multilock); |
LIST_REMOVE(in6m, in6m_entry); |
} |
if (in6m->in6m_ia != NULL) { |
|
IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ |
|
in6m->in6m_ia = NULL; |
|
} |
|
|
|
/* |
/* |
* Delete all references of this multicasting group from |
* Look up the in6_multi record for a given IP6 multicast address |
* the membership arrays |
* on a given interface. If no matching record is found, "in6m" |
*/ |
* returns NULL. |
for (ia = in6_ifaddr; ia; ia = ia->ia_next) { |
*/ |
struct in6_multi_mship *imm; |
struct in6_multi * |
LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) { |
in6_lookup_multi(const struct in6_addr *addr, const struct ifnet *ifp) |
if (imm->i6mm_maddr == in6m) |
{ |
imm->i6mm_maddr = NULL; |
struct in6_multi *in6m; |
} |
|
} |
KASSERT(rw_lock_held(&in6_multilock)); |
|
|
|
LIST_FOREACH(in6m, &ifp->if_multiaddrs, in6m_entry) { |
|
if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, addr)) |
|
break; |
|
} |
|
return in6m; |
|
} |
|
|
|
bool |
|
in6_multi_group(const struct in6_addr *addr, const struct ifnet *ifp) |
|
{ |
|
bool ingroup; |
|
|
|
rw_enter(&in6_multilock, RW_READER); |
|
ingroup = in6_lookup_multi(addr, ifp) != NULL; |
|
rw_exit(&in6_multilock); |
|
|
|
return ingroup; |
|
} |
|
|
|
/* |
|
* Purge in6_multi records associated to the interface. |
|
*/ |
|
void |
|
in6_purge_multi(struct ifnet *ifp) |
|
{ |
|
struct in6_multi *in6m, *next; |
|
|
|
rw_enter(&in6_multilock, RW_WRITER); |
|
LIST_FOREACH_SAFE(in6m, &ifp->if_multiaddrs, in6m_entry, next) { |
/* |
/* |
* Notify the network driver to update its multicast |
* Normally multicast addresses are already purged at this |
* reception filter. |
* point. Remaining references aren't accessible via ifp, |
|
* so what we can do here is to prevent ifp from being |
|
* accessed via in6m by removing it from the list of ifp. |
*/ |
*/ |
sockaddr_in6_init(&ifr.ifr_addr, &in6m->in6m_addr, 0, 0, 0); |
mld_stoptimer(in6m); |
(*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp, SIOCDELMULTI, &ifr); |
LIST_REMOVE(in6m, in6m_entry); |
callout_destroy(&in6m->in6m_timer_ch); |
|
free(in6m, M_IPMADDR); |
|
} |
} |
splx(s); |
rw_exit(&in6_multilock); |
|
} |
|
|
|
void |
|
in6_multi_lock(int op) |
|
{ |
|
|
|
rw_enter(&in6_multilock, op); |
} |
} |
|
|
|
void |
|
in6_multi_unlock(void) |
|
{ |
|
|
|
rw_exit(&in6_multilock); |
|
} |
|
|
|
bool |
|
in6_multi_locked(int op) |
|
{ |
|
|
|
switch (op) { |
|
case RW_READER: |
|
return rw_read_held(&in6_multilock); |
|
case RW_WRITER: |
|
return rw_write_held(&in6_multilock); |
|
default: |
|
return rw_lock_held(&in6_multilock); |
|
} |
|
} |
|
|
struct in6_multi_mship * |
struct in6_multi_mship * |
in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, |
in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp, int timer) |
int *errorp, int timer) |
|
{ |
{ |
struct in6_multi_mship *imm; |
struct in6_multi_mship *imm; |
|
|
Line 771 in6_joingroup(struct ifnet *ifp, struct |
|
Line 946 in6_joingroup(struct ifnet *ifp, struct |
|
int |
int |
in6_leavegroup(struct in6_multi_mship *imm) |
in6_leavegroup(struct in6_multi_mship *imm) |
{ |
{ |
|
struct in6_multi *in6m; |
|
|
if (imm->i6mm_maddr) { |
rw_enter(&in6_multilock, RW_WRITER); |
in6_delmulti(imm->i6mm_maddr); |
in6m = imm->i6mm_maddr; |
|
imm->i6mm_maddr = NULL; |
|
if (in6m != NULL) { |
|
in6_delmulti_locked(in6m); |
} |
} |
|
rw_exit(&in6_multilock); |
free(imm, M_IPMADDR); |
free(imm, M_IPMADDR); |
return 0; |
return 0; |
} |
} |
|
|
|
|
/* |
/* |
* Multicast address kludge: |
* DEPRECATED: keep it just to avoid breaking old sysctl users. |
* If there were any multicast addresses attached to this interface address, |
|
* either move them to another address on this interface, or save them until |
|
* such time as this interface is reconfigured for IPv6. |
|
*/ |
*/ |
void |
static int |
in6_savemkludge(struct in6_ifaddr *oia) |
in6_mkludge_sysctl(SYSCTLFN_ARGS) |
{ |
{ |
struct in6_ifaddr *ia; |
|
struct in6_multi *in6m; |
|
|
|
IFP_TO_IA6(oia->ia_ifp, ia); |
|
if (ia) { /* there is another address */ |
|
KASSERT(ia != oia); |
|
while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) { |
|
LIST_REMOVE(in6m, in6m_entry); |
|
IFAREF(&ia->ia_ifa); |
|
IFAFREE(&in6m->in6m_ia->ia_ifa); |
|
in6m->in6m_ia = ia; |
|
LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); |
|
} |
|
} else { /* last address on this if deleted, save */ |
|
struct multi6_kludge *mk; |
|
|
|
LIST_FOREACH(mk, &in6_mk, mk_entry) { |
if (namelen != 1) |
if (mk->mk_ifp == oia->ia_ifp) |
return EINVAL; |
break; |
*oldlenp = 0; |
} |
return 0; |
if (mk == NULL) /* this should not happen! */ |
|
panic("in6_savemkludge: no kludge space"); |
|
|
|
while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) { |
|
LIST_REMOVE(in6m, in6m_entry); |
|
IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ |
|
in6m->in6m_ia = NULL; |
|
LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry); |
|
} |
|
} |
|
} |
} |
|
|
/* |
static int |
* Continuation of multicast address hack: |
in6_multicast_sysctl(SYSCTLFN_ARGS) |
* If there was a multicast group list previously saved for this interface, |
|
* then we re-attach it to the first address configured on the i/f. |
|
*/ |
|
void |
|
in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp) |
|
{ |
{ |
struct multi6_kludge *mk; |
struct ifnet *ifp; |
|
struct ifaddr *ifa; |
|
struct in6_ifaddr *ia6; |
struct in6_multi *in6m; |
struct in6_multi *in6m; |
|
uint32_t tmp; |
|
int error; |
|
size_t written; |
|
struct psref psref, psref_ia; |
|
int bound, s; |
|
|
|
if (namelen != 1) |
|
return EINVAL; |
|
|
|
rw_enter(&in6_multilock, RW_READER); |
|
|
|
bound = curlwp_bind(); |
|
ifp = if_get_byindex(name[0], &psref); |
|
if (ifp == NULL) { |
|
curlwp_bindx(bound); |
|
rw_exit(&in6_multilock); |
|
return ENODEV; |
|
} |
|
|
|
if (oldp == NULL) { |
|
*oldlenp = 0; |
|
s = pserialize_read_enter(); |
|
IFADDR_READER_FOREACH(ifa, ifp) { |
|
LIST_FOREACH(in6m, &ifp->if_multiaddrs, in6m_entry) { |
|
*oldlenp += 2 * sizeof(struct in6_addr) + |
|
sizeof(uint32_t); |
|
} |
|
} |
|
pserialize_read_exit(s); |
|
if_put(ifp, &psref); |
|
curlwp_bindx(bound); |
|
rw_exit(&in6_multilock); |
|
return 0; |
|
} |
|
|
|
error = 0; |
|
written = 0; |
|
s = pserialize_read_enter(); |
|
IFADDR_READER_FOREACH(ifa, ifp) { |
|
if (ifa->ifa_addr->sa_family != AF_INET6) |
|
continue; |
|
|
|
ifa_acquire(ifa, &psref_ia); |
|
pserialize_read_exit(s); |
|
|
|
ia6 = ifatoia6(ifa); |
|
LIST_FOREACH(in6m, &ifp->if_multiaddrs, in6m_entry) { |
|
if (written + 2 * sizeof(struct in6_addr) + |
|
sizeof(uint32_t) > *oldlenp) |
|
goto done; |
|
/* |
|
* XXX return the first IPv6 address to keep backward |
|
* compatibility, however now multicast addresses |
|
* don't belong to any IPv6 addresses so it should be |
|
* unnecessary. |
|
*/ |
|
error = sysctl_copyout(l, &ia6->ia_addr.sin6_addr, |
|
oldp, sizeof(struct in6_addr)); |
|
if (error) |
|
goto done; |
|
oldp = (char *)oldp + sizeof(struct in6_addr); |
|
written += sizeof(struct in6_addr); |
|
error = sysctl_copyout(l, &in6m->in6m_addr, |
|
oldp, sizeof(struct in6_addr)); |
|
if (error) |
|
goto done; |
|
oldp = (char *)oldp + sizeof(struct in6_addr); |
|
written += sizeof(struct in6_addr); |
|
tmp = in6m->in6m_refcount; |
|
error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp)); |
|
if (error) |
|
goto done; |
|
oldp = (char *)oldp + sizeof(tmp); |
|
written += sizeof(tmp); |
|
} |
|
|
LIST_FOREACH(mk, &in6_mk, mk_entry) { |
s = pserialize_read_enter(); |
if (mk->mk_ifp == ifp) |
|
break; |
|
} |
|
if (mk == NULL) |
|
return; |
|
while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) { |
|
LIST_REMOVE(in6m, in6m_entry); |
|
in6m->in6m_ia = ia; |
|
IFAREF(&ia->ia_ifa); |
|
LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); |
|
} |
|
} |
|
|
|
/* |
|
* Allocate space for the kludge at interface initialization time. |
|
* Formerly, we dynamically allocated the space in in6_savemkludge() with |
|
* malloc(M_WAITOK). However, it was wrong since the function could be called |
|
* under an interrupt context (software timer on address lifetime expiration). |
|
* Also, we cannot just give up allocating the strucutre, since the group |
|
* membership structure is very complex and we need to keep it anyway. |
|
* Of course, this function MUST NOT be called under an interrupt context. |
|
* Specifically, it is expected to be called only from in6_ifattach(), though |
|
* it is a global function. |
|
*/ |
|
void |
|
in6_createmkludge(struct ifnet *ifp) |
|
{ |
|
struct multi6_kludge *mk; |
|
|
|
LIST_FOREACH(mk, &in6_mk, mk_entry) { |
break; |
/* If we've already had one, do not allocate. */ |
|
if (mk->mk_ifp == ifp) |
|
return; |
|
} |
} |
|
pserialize_read_exit(s); |
mk = malloc(sizeof(*mk), M_IPMADDR, M_ZERO|M_WAITOK); |
done: |
|
ifa_release(ifa, &psref_ia); |
LIST_INIT(&mk->mk_head); |
if_put(ifp, &psref); |
mk->mk_ifp = ifp; |
curlwp_bindx(bound); |
LIST_INSERT_HEAD(&in6_mk, mk, mk_entry); |
rw_exit(&in6_multilock); |
|
*oldlenp = written; |
|
return error; |
} |
} |
|
|
void |
void |
in6_purgemkludge(struct ifnet *ifp) |
in6_sysctl_multicast_setup(struct sysctllog **clog) |
{ |
{ |
struct multi6_kludge *mk; |
|
struct in6_multi *in6m, *next; |
|
|
|
LIST_FOREACH(mk, &in6_mk, mk_entry) { |
sysctl_createv(clog, 0, NULL, NULL, |
if (mk->mk_ifp == ifp) |
CTLFLAG_PERMANENT, |
break; |
CTLTYPE_NODE, "inet6", NULL, |
} |
NULL, 0, NULL, 0, |
if (mk == NULL) |
CTL_NET, PF_INET6, CTL_EOL); |
return; |
|
|
sysctl_createv(clog, 0, NULL, NULL, |
/* leave from all multicast groups joined */ |
CTLFLAG_PERMANENT, |
for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) { |
CTLTYPE_NODE, "multicast", |
next = LIST_NEXT(in6m, in6m_entry); |
SYSCTL_DESCR("Multicast information"), |
in6_delmulti(in6m); |
in6_multicast_sysctl, 0, NULL, 0, |
} |
CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL); |
LIST_REMOVE(mk, mk_entry); |
|
free(mk, M_IPMADDR); |
sysctl_createv(clog, 0, NULL, NULL, |
|
CTLFLAG_PERMANENT, |
|
CTLTYPE_NODE, "multicast_kludge", |
|
SYSCTL_DESCR("multicast kludge information"), |
|
in6_mkludge_sysctl, 0, NULL, 0, |
|
CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL); |
} |
} |