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unlock igmp and mld6 fast timer
On Tue, Dec 02, 2025 at 11:01:36PM +0100, Alexander Bluhm wrote:
> Hi,
>
> After moving around code for a while, I think a rwlock to protect
> if_maddrlist is the next step. The malloc(M_WAITOK) in rti_fill()
> prevents us from using a mutex here.
>
> So protect the TAILQ if_maddrlist with rwlock if_maddrlock. Also
> struct in_multi and in6_multi use this lock for their state and
> timer. Sleeps in malloc and IP output are possible.
>
> This allows to run IGMP and MLD6 fast timeout with shared net lock.
I would like to proceed with MP multicast.
OK? objections?
bluhm
Index: net/if.c
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/net/if.c,v
diff -u -p -r1.760 if.c
--- net/if.c 11 Dec 2025 07:09:20 -0000 1.760
+++ net/if.c 29 Dec 2025 12:04:38 -0000
@@ -662,6 +662,7 @@ if_attach_common(struct ifnet *ifp)
TAILQ_INIT(&ifp->if_addrlist);
TAILQ_INIT(&ifp->if_maddrlist);
TAILQ_INIT(&ifp->if_groups);
+ rw_init(&ifp->if_maddrlock, "maddr");
if (!ISSET(ifp->if_xflags, IFXF_MPSAFE)) {
KASSERTMSG(ifp->if_qstart == NULL,
Index: net/if_var.h
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/net/if_var.h,v
diff -u -p -r1.145 if_var.h
--- net/if_var.h 19 Dec 2025 02:04:13 -0000 1.145
+++ net/if_var.h 29 Dec 2025 12:04:38 -0000
@@ -81,6 +81,7 @@
* K kernel lock
* N net lock
* T if_tmplist_lock
+ * m interface multicast rwlock if_maddrlock
*
* For SRP related structures that allow lock-free reads, the write lock
* is indicated below.
@@ -153,8 +154,9 @@ struct ifnet { /* and the entries */
TAILQ_ENTRY(ifnet) if_list; /* [NK] all struct ifnets are chained */
TAILQ_ENTRY(ifnet) if_tmplist; /* [T] temporary list */
TAILQ_HEAD(, ifaddr) if_addrlist; /* [N] list of addresses per if */
- TAILQ_HEAD(, ifmaddr) if_maddrlist; /* [N] list of multicast records */
+ TAILQ_HEAD(, ifmaddr) if_maddrlist; /* [m] list of multicast records */
TAILQ_HEAD(, ifg_list) if_groups; /* [N] list of groups per if */
+ struct rwlock if_maddrlock;
struct task_list if_addrhooks; /* [I] address change callbacks */
struct task_list if_linkstatehooks; /* [I] link change callbacks*/
struct task_list if_detachhooks; /* [I] detach callbacks */
@@ -273,10 +275,10 @@ struct ifaddr {
* Interface multicast address.
*/
struct ifmaddr {
- struct sockaddr *ifma_addr; /* Protocol address */
- unsigned int ifma_ifidx; /* Index of the interface */
+ TAILQ_ENTRY(ifmaddr) ifma_list; /* [m] Per-interface list */
+ struct sockaddr *ifma_addr; /* [I] Protocol address */
struct refcnt ifma_refcnt; /* Count of references */
- TAILQ_ENTRY(ifmaddr) ifma_list; /* Per-interface list */
+ unsigned int ifma_ifidx; /* [I] Index of the interface */
};
/*
Index: netinet/igmp.c
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet/igmp.c,v
diff -u -p -r1.93 igmp.c
--- netinet/igmp.c 2 Dec 2025 15:52:04 -0000 1.93
+++ netinet/igmp.c 29 Dec 2025 12:04:38 -0000
@@ -341,6 +341,7 @@ igmp_input_if(struct ifnet *ifp, struct
* except those that are already running and those
* that belong to a "local" group (224.0.0.X).
*/
+ rw_enter_write(&ifp->if_maddrlock);
TAILQ_FOREACH(ifma, &ifp->if_maddrlist, ifma_list) {
if (ifma->ifma_addr->sa_family != AF_INET)
continue;
@@ -353,6 +354,7 @@ igmp_input_if(struct ifnet *ifp, struct
running = 1;
}
}
+ rw_exit_write(&ifp->if_maddrlock);
} else {
if (!IN_MULTICAST(ip->ip_dst.s_addr)) {
igmpstat_inc(igps_rcv_badqueries);
@@ -372,6 +374,7 @@ igmp_input_if(struct ifnet *ifp, struct
* timers already running, check if they need to be
* reset.
*/
+ rw_enter_write(&ifp->if_maddrlock);
TAILQ_FOREACH(ifma, &ifp->if_maddrlist, ifma_list) {
if (ifma->ifma_addr->sa_family != AF_INET)
continue;
@@ -400,6 +403,7 @@ igmp_input_if(struct ifnet *ifp, struct
}
}
}
+ rw_exit_write(&ifp->if_maddrlock);
}
break;
@@ -436,6 +440,7 @@ igmp_input_if(struct ifnet *ifp, struct
* If we belong to the group being reported, stop
* our timer for that group.
*/
+ rw_enter_write(&ifp->if_maddrlock);
inm = in_lookupmulti(&igmp->igmp_group, ifp);
if (inm != NULL) {
inm->inm_timer = 0;
@@ -456,6 +461,7 @@ igmp_input_if(struct ifnet *ifp, struct
break;
}
}
+ rw_exit_write(&ifp->if_maddrlock);
break;
@@ -504,6 +510,7 @@ igmp_input_if(struct ifnet *ifp, struct
* If we belong to the group being reported, stop
* our timer for that group.
*/
+ rw_enter_write(&ifp->if_maddrlock);
inm = in_lookupmulti(&igmp->igmp_group, ifp);
if (inm != NULL) {
inm->inm_timer = 0;
@@ -520,6 +527,7 @@ igmp_input_if(struct ifnet *ifp, struct
break;
}
}
+ rw_exit_write(&ifp->if_maddrlock);
break;
@@ -542,6 +550,8 @@ igmp_joingroup(struct in_multi *inm, str
{
int i, running = 0;
+ rw_assert_wrlock(&ifp->if_maddrlock);
+
inm->inm_state = IGMP_IDLE_MEMBER;
if (!IN_LOCAL_GROUP(inm->inm_addr.s_addr) &&
@@ -564,6 +574,8 @@ igmp_joingroup(struct in_multi *inm, str
void
igmp_leavegroup(struct in_multi *inm, struct ifnet *ifp)
{
+ rw_assert_anylock(&ifp->if_maddrlock);
+
switch (inm->inm_state) {
case IGMP_DELAYING_MEMBER:
case IGMP_IDLE_MEMBER:
@@ -598,7 +610,7 @@ igmp_fasttimo(void)
return;
membar_consumer();
- NET_LOCK();
+ NET_LOCK_SHARED();
TAILQ_FOREACH(ifp, &ifnetlist, if_list) {
if (igmp_checktimer(ifp))
@@ -608,7 +620,7 @@ igmp_fasttimo(void)
membar_producer();
atomic_store_int(&igmp_timers_are_running, running);
- NET_UNLOCK();
+ NET_UNLOCK_SHARED();
}
int
@@ -618,8 +630,7 @@ igmp_checktimer(struct ifnet *ifp)
struct ifmaddr *ifma;
int running = 0;
- NET_ASSERT_LOCKED();
-
+ rw_enter_write(&ifp->if_maddrlock);
TAILQ_FOREACH(ifma, &ifp->if_maddrlist, ifma_list) {
if (ifma->ifma_addr->sa_family != AF_INET)
continue;
@@ -640,6 +651,7 @@ igmp_checktimer(struct ifnet *ifp)
running = 1;
}
}
+ rw_exit_write(&ifp->if_maddrlock);
return (running);
}
Index: netinet/in.c
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet/in.c,v
diff -u -p -r1.190 in.c
--- netinet/in.c 2 Dec 2025 15:52:04 -0000 1.190
+++ netinet/in.c 29 Dec 2025 12:04:38 -0000
@@ -853,7 +853,7 @@ in_lookupmulti(const struct in_addr *add
struct in_multi *inm = NULL;
struct ifmaddr *ifma;
- NET_ASSERT_LOCKED();
+ rw_assert_anylock(&ifp->if_maddrlock);
TAILQ_FOREACH(ifma, &ifp->if_maddrlist, ifma_list) {
if (ifma->ifma_addr->sa_family == AF_INET &&
@@ -871,54 +871,67 @@ in_lookupmulti(const struct in_addr *add
struct in_multi *
in_addmulti(const struct in_addr *addr, struct ifnet *ifp)
{
- struct in_multi *inm;
+ struct in_multi *inm, *new_inm = NULL;
struct ifreq ifr;
/*
* See if address already in list.
*/
+ rw_enter_write(&ifp->if_maddrlock);
inm = in_lookupmulti(addr, ifp);
- if (inm != NULL) {
- /*
- * Found it; just increment the reference count.
- */
- refcnt_take(&inm->inm_refcnt);
- } else {
- /*
- * New address; allocate a new multicast record
- * and link it into the interface's multicast list.
- */
- inm = malloc(sizeof(*inm), M_IPMADDR, M_WAITOK | M_ZERO);
- inm->inm_sin.sin_len = sizeof(struct sockaddr_in);
- inm->inm_sin.sin_family = AF_INET;
- inm->inm_sin.sin_addr = *addr;
- refcnt_init_trace(&inm->inm_refcnt, DT_REFCNT_IDX_IFMADDR);
- inm->inm_ifidx = ifp->if_index;
- inm->inm_ifma.ifma_addr = sintosa(&inm->inm_sin);
+ if (inm != NULL)
+ goto found;
+ rw_exit_write(&ifp->if_maddrlock);
- /*
- * Ask the network driver to update its multicast reception
- * filter appropriately for the new address.
- */
- memset(&ifr, 0, sizeof(ifr));
- memcpy(&ifr.ifr_addr, &inm->inm_sin, sizeof(inm->inm_sin));
- KERNEL_LOCK();
- if ((*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) {
- KERNEL_UNLOCK();
- free(inm, M_IPMADDR, sizeof(*inm));
- return (NULL);
- }
+ /*
+ * New address; allocate a new multicast record
+ * and link it into the interface's multicast list.
+ */
+ new_inm = malloc(sizeof(*inm), M_IPMADDR, M_WAITOK | M_ZERO);
+
+ /*
+ * Ask the network driver to update its multicast reception
+ * filter appropriately for the new address.
+ */
+ memset(&ifr, 0, sizeof(ifr));
+ satosin(&ifr.ifr_addr)->sin_len = sizeof(struct sockaddr_in);
+ satosin(&ifr.ifr_addr)->sin_family = AF_INET;
+ satosin(&ifr.ifr_addr)->sin_addr = *addr;
+ KERNEL_LOCK();
+ if ((*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) {
KERNEL_UNLOCK();
+ goto out;
+ }
+ KERNEL_UNLOCK();
- TAILQ_INSERT_HEAD(&ifp->if_maddrlist, &inm->inm_ifma,
- ifma_list);
+ rw_enter_write(&ifp->if_maddrlock);
+ /* check again after unlock and lock */
+ inm = in_lookupmulti(addr, ifp);
+ if (inm != NULL)
+ goto found;
+ inm = new_inm;
+ inm->inm_sin.sin_len = sizeof(struct sockaddr_in);
+ inm->inm_sin.sin_family = AF_INET;
+ inm->inm_sin.sin_addr = *addr;
+ refcnt_init_trace(&inm->inm_refcnt, DT_REFCNT_IDX_IFMADDR);
+ inm->inm_ifidx = ifp->if_index;
+ inm->inm_ifma.ifma_addr = sintosa(&inm->inm_sin);
- /*
- * Let IGMP know that we have joined a new IP multicast group.
- */
- igmp_joingroup(inm, ifp);
- }
+ TAILQ_INSERT_HEAD(&ifp->if_maddrlist, &inm->inm_ifma, ifma_list);
+
+ /*
+ * Let IGMP know that we have joined a new IP multicast group.
+ */
+ igmp_joingroup(inm, ifp);
+ rw_exit_write(&ifp->if_maddrlock);
+
+ return (inm);
+ found:
+ refcnt_take(&inm->inm_refcnt);
+ rw_exit_write(&ifp->if_maddrlock);
+ out:
+ free(new_inm, M_IPMADDR, sizeof(*inm));
return (inm);
}
@@ -931,19 +944,21 @@ in_delmulti(struct in_multi *inm)
struct ifreq ifr;
struct ifnet *ifp;
- NET_ASSERT_LOCKED();
-
if (refcnt_rele(&inm->inm_refcnt) == 0)
return;
ifp = if_get(inm->inm_ifidx);
if (ifp != NULL) {
+ rw_enter_write(&ifp->if_maddrlock);
/*
* No remaining claims to this record; let IGMP know that
* we are leaving the multicast group.
*/
igmp_leavegroup(inm, ifp);
+ TAILQ_REMOVE(&ifp->if_maddrlist, &inm->inm_ifma, ifma_list);
+ rw_exit_write(&ifp->if_maddrlock);
+
/*
* Notify the network driver to update its multicast
* reception filter.
@@ -956,9 +971,8 @@ in_delmulti(struct in_multi *inm)
(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr);
KERNEL_UNLOCK();
- TAILQ_REMOVE(&ifp->if_maddrlist, &inm->inm_ifma, ifma_list);
+ if_put(ifp);
}
- if_put(ifp);
free(inm, M_IPMADDR, sizeof(*inm));
}
@@ -973,8 +987,10 @@ in_hasmulti(const struct in_addr *addr,
struct in_multi *inm;
int joined;
+ rw_enter_read(&ifp->if_maddrlock);
inm = in_lookupmulti(addr, ifp);
joined = (inm != NULL);
+ rw_exit_read(&ifp->if_maddrlock);
return (joined);
}
Index: netinet/in_var.h
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet/in_var.h,v
diff -u -p -r1.44 in_var.h
--- netinet/in_var.h 2 Dec 2025 15:52:04 -0000 1.44
+++ netinet/in_var.h 29 Dec 2025 12:04:38 -0000
@@ -87,11 +87,11 @@ struct in_multi {
#define inm_refcnt inm_ifma.ifma_refcnt
#define inm_ifidx inm_ifma.ifma_ifidx
- struct sockaddr_in inm_sin; /* IPv4 multicast address */
+ struct sockaddr_in inm_sin; /* [I] IPv4 multicast address */
#define inm_addr inm_sin.sin_addr
- u_int inm_state; /* state of membership */
- u_int inm_timer; /* IGMP membership report timer */
+ u_int inm_state; /* [m] state of membership */
+ u_int inm_timer; /* [m] IGMP membership report */
struct router_info *inm_rti; /* router version info */
};
Index: netinet6/in6.c
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet6/in6.c,v
diff -u -p -r1.275 in6.c
--- netinet6/in6.c 13 Nov 2025 23:30:01 -0000 1.275
+++ netinet6/in6.c 29 Dec 2025 12:04:38 -0000
@@ -1007,7 +1007,7 @@ in6_lookupmulti(const struct in6_addr *a
struct in6_multi *in6m = NULL;
struct ifmaddr *ifma;
- NET_ASSERT_LOCKED();
+ rw_assert_anylock(&ifp->if_maddrlock);
TAILQ_FOREACH(ifma, &ifp->if_maddrlist, ifma_list) {
if (ifma->ifma_addr->sa_family == AF_INET6 &&
@@ -1026,62 +1026,71 @@ in6_lookupmulti(const struct in6_addr *a
struct in6_multi *
in6_addmulti(const struct in6_addr *addr, struct ifnet *ifp, int *errorp)
{
+ struct in6_multi *in6m, *new_in6m = NULL;
struct in6_ifreq ifr;
- struct in6_multi *in6m;
-
- NET_ASSERT_LOCKED();
*errorp = 0;
/*
* See if address already in list.
*/
+ rw_enter_write(&ifp->if_maddrlock);
in6m = in6_lookupmulti(addr, ifp);
- if (in6m != NULL) {
- /*
- * Found it; just increment the reference count.
- */
- refcnt_take(&in6m->in6m_refcnt);
- } else {
- /*
- * New address; allocate a new multicast record
- * and link it into the interface's multicast list.
- */
- in6m = malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT | M_ZERO);
- if (in6m == NULL) {
- *errorp = ENOBUFS;
- return (NULL);
- }
+ if (in6m != NULL)
+ goto found;
+ rw_exit_write(&ifp->if_maddrlock);
- in6m->in6m_sin.sin6_len = sizeof(struct sockaddr_in6);
- in6m->in6m_sin.sin6_family = AF_INET6;
- in6m->in6m_sin.sin6_addr = *addr;
- refcnt_init_trace(&in6m->in6m_refcnt, DT_REFCNT_IDX_IFMADDR);
- in6m->in6m_ifidx = ifp->if_index;
- in6m->in6m_ifma.ifma_addr = sin6tosa(&in6m->in6m_sin);
+ /*
+ * New address; allocate a new multicast record
+ * and link it into the interface's multicast list.
+ */
+ new_in6m = malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT | M_ZERO);
+ if (new_in6m == NULL) {
+ *errorp = ENOBUFS;
+ return (NULL);
+ }
- /*
- * Ask the network driver to update its multicast reception
- * filter appropriately for the new address.
- */
- memcpy(&ifr.ifr_addr, &in6m->in6m_sin, sizeof(in6m->in6m_sin));
- KERNEL_LOCK();
- *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr);
- KERNEL_UNLOCK();
- if (*errorp) {
- free(in6m, M_IPMADDR, sizeof(*in6m));
- return (NULL);
- }
+ /*
+ * Ask the network driver to update its multicast reception
+ * filter appropriately for the new address.
+ */
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
+ ifr.ifr_addr.sin6_family = AF_INET6;
+ ifr.ifr_addr.sin6_addr = *addr;
+ KERNEL_LOCK();
+ *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr);
+ KERNEL_UNLOCK();
+ if (*errorp)
+ goto out;
+
+ rw_enter_write(&ifp->if_maddrlock);
+ /* check again after unlock and lock */
+ in6m = in6_lookupmulti(addr, ifp);
+ if (in6m != NULL)
+ goto found;
+ in6m = new_in6m;
+ in6m->in6m_sin.sin6_len = sizeof(struct sockaddr_in6);
+ in6m->in6m_sin.sin6_family = AF_INET6;
+ in6m->in6m_sin.sin6_addr = *addr;
+ refcnt_init_trace(&in6m->in6m_refcnt, DT_REFCNT_IDX_IFMADDR);
+ in6m->in6m_ifidx = ifp->if_index;
+ in6m->in6m_ifma.ifma_addr = sin6tosa(&in6m->in6m_sin);
+
+ TAILQ_INSERT_HEAD(&ifp->if_maddrlist, &in6m->in6m_ifma, ifma_list);
- TAILQ_INSERT_HEAD(&ifp->if_maddrlist, &in6m->in6m_ifma,
- ifma_list);
+ /*
+ * Let MLD6 know that we have joined a new IP6 multicast group.
+ */
+ mld6_start_listening(in6m, ifp);
+ rw_exit_write(&ifp->if_maddrlock);
- /*
- * Let MLD6 know that we have joined a new IP6 multicast
- * group.
- */
- mld6_start_listening(in6m);
- }
+ return (in6m);
+ found:
+ refcnt_take(&in6m->in6m_refcnt);
+ rw_exit_write(&ifp->if_maddrlock);
+ out:
+ free(new_in6m, M_IPMADDR, sizeof(*in6m));
return (in6m);
}
@@ -1094,36 +1103,37 @@ in6_delmulti(struct in6_multi *in6m)
struct in6_ifreq ifr;
struct ifnet *ifp;
- NET_ASSERT_LOCKED();
+ if (refcnt_rele(&in6m->in6m_refcnt) == 0)
+ return;
- if (refcnt_rele(&in6m->in6m_refcnt) != 0) {
+ ifp = if_get(in6m->in6m_ifidx);
+ if (ifp != NULL) {
+ rw_enter_write(&ifp->if_maddrlock);
/*
* No remaining claims to this record; let MLD6 know
* that we are leaving the multicast group.
*/
- mld6_stop_listening(in6m);
- ifp = if_get(in6m->in6m_ifidx);
+ mld6_stop_listening(in6m, ifp);
+
+ TAILQ_REMOVE(&ifp->if_maddrlist, &in6m->in6m_ifma, ifma_list);
+ rw_exit_write(&ifp->if_maddrlock);
/*
* Notify the network driver to update its multicast
* reception filter.
*/
- if (ifp != NULL) {
- bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6));
- ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
- ifr.ifr_addr.sin6_family = AF_INET6;
- ifr.ifr_addr.sin6_addr = in6m->in6m_addr;
- KERNEL_LOCK();
- (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr);
- KERNEL_UNLOCK();
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
+ ifr.ifr_addr.sin6_family = AF_INET6;
+ ifr.ifr_addr.sin6_addr = in6m->in6m_addr;
+ KERNEL_LOCK();
+ (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr);
+ KERNEL_UNLOCK();
- TAILQ_REMOVE(&ifp->if_maddrlist, &in6m->in6m_ifma,
- ifma_list);
- }
if_put(ifp);
-
- free(in6m, M_IPMADDR, sizeof(*in6m));
}
+
+ free(in6m, M_IPMADDR, sizeof(*in6m));
}
/*
@@ -1136,8 +1146,10 @@ in6_hasmulti(const struct in6_addr *addr
struct in6_multi *in6m;
int joined;
+ rw_enter_read(&ifp->if_maddrlock);
in6m = in6_lookupmulti(addr, ifp);
joined = (in6m != NULL);
+ rw_exit_read(&ifp->if_maddrlock);
return (joined);
}
Index: netinet6/in6_var.h
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet6/in6_var.h,v
diff -u -p -r1.82 in6_var.h
--- netinet6/in6_var.h 12 Nov 2025 11:37:08 -0000 1.82
+++ netinet6/in6_var.h 29 Dec 2025 12:04:38 -0000
@@ -316,11 +316,11 @@ struct in6_multi {
#define in6m_refcnt in6m_ifma.ifma_refcnt
#define in6m_ifidx in6m_ifma.ifma_ifidx
- struct sockaddr_in6 in6m_sin; /* IPv6 multicast address */
+ struct sockaddr_in6 in6m_sin; /* [I] IPv6 multicast address */
#define in6m_addr in6m_sin.sin6_addr
- u_int in6m_state; /* state of membership */
- u_int in6m_timer; /* MLD6 membership report timer */
+ u_int in6m_state; /* [m] state of membership */
+ u_int in6m_timer; /* [m] MLD6 membership report */
};
static __inline struct in6_multi *
Index: netinet6/mld6.c
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet6/mld6.c,v
diff -u -p -r1.70 mld6.c
--- netinet6/mld6.c 12 Nov 2025 19:11:10 -0000 1.70
+++ netinet6/mld6.c 29 Dec 2025 12:04:38 -0000
@@ -112,12 +112,14 @@ mld6_init(void)
}
void
-mld6_start_listening(struct in6_multi *in6m)
+mld6_start_listening(struct in6_multi *in6m, struct ifnet *ifp)
{
/* XXX: These are necessary for KAME's link-local hack */
struct in6_addr all_nodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
int running = 0;
+ rw_assert_wrlock(&ifp->if_maddrlock);
+
/*
* RFC2710 page 10:
* The node never sends a Report or Done for the link-scope all-nodes
@@ -147,12 +149,14 @@ mld6_start_listening(struct in6_multi *i
}
void
-mld6_stop_listening(struct in6_multi *in6m)
+mld6_stop_listening(struct in6_multi *in6m, struct ifnet *ifp)
{
/* XXX: These are necessary for KAME's link-local hack */
struct in6_addr all_nodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
struct in6_addr all_routers = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
+ rw_assert_anylock(&ifp->if_maddrlock);
+
all_nodes.s6_addr16[1] = htons(in6m->in6m_ifidx);
/* XXX: necessary when mrouting */
all_routers.s6_addr16[1] = htons(in6m->in6m_ifidx);
@@ -254,6 +258,7 @@ mld6_input(struct mbuf *m, int off)
timer = 1;
all_nodes.s6_addr16[1] = htons(ifp->if_index);
+ rw_enter_write(&ifp->if_maddrlock);
TAILQ_FOREACH(ifma, &ifp->if_maddrlist, ifma_list) {
if (ifma->ifma_addr->sa_family != AF_INET6)
continue;
@@ -281,6 +286,7 @@ mld6_input(struct mbuf *m, int off)
}
}
}
+ rw_exit_write(&ifp->if_maddrlock);
if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
@@ -308,11 +314,13 @@ mld6_input(struct mbuf *m, int off)
* If we belong to the group being reported, stop
* our timer for that group.
*/
+ rw_enter_write(&ifp->if_maddrlock);
in6m = in6_lookupmulti(&mldh->mld_addr, ifp);
if (in6m) {
in6m->in6m_timer = 0; /* transit to idle state */
in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
}
+ rw_exit_write(&ifp->if_maddrlock);
if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
@@ -355,7 +363,7 @@ mld6_fasttimo(void)
return;
membar_consumer();
- NET_LOCK();
+ NET_LOCK_SHARED();
TAILQ_FOREACH(ifp, &ifnetlist, if_list) {
if (mld6_checktimer(ifp))
@@ -365,7 +373,7 @@ mld6_fasttimo(void)
membar_producer();
atomic_store_int(&mld6_timers_are_running, running);
- NET_UNLOCK();
+ NET_UNLOCK_SHARED();
}
int
@@ -375,8 +383,7 @@ mld6_checktimer(struct ifnet *ifp)
struct ifmaddr *ifma;
int running = 0;
- NET_ASSERT_LOCKED();
-
+ rw_enter_write(&ifp->if_maddrlock);
TAILQ_FOREACH(ifma, &ifp->if_maddrlist, ifma_list) {
if (ifma->ifma_addr->sa_family != AF_INET6)
continue;
@@ -390,6 +397,7 @@ mld6_checktimer(struct ifnet *ifp)
running = 1;
}
}
+ rw_exit_write(&ifp->if_maddrlock);
return (running);
}
Index: netinet6/mld6_var.h
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/netinet6/mld6_var.h,v
diff -u -p -r1.7 mld6_var.h
--- netinet6/mld6_var.h 12 Nov 2025 19:11:10 -0000 1.7
+++ netinet6/mld6_var.h 29 Dec 2025 12:04:38 -0000
@@ -45,8 +45,8 @@
void mld6_init(void);
void mld6_input(struct mbuf *, int);
-void mld6_start_listening(struct in6_multi *);
-void mld6_stop_listening(struct in6_multi *);
+void mld6_start_listening(struct in6_multi *, struct ifnet *);
+void mld6_stop_listening(struct in6_multi *, struct ifnet *);
void mld6_fasttimo(void);
#endif /* _KERNEL */
unlock igmp and mld6 fast timer