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Kill `inp_notify' list remains.

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This was the list where PCBs were temporary linked to avoid sleep with
`inpt_mtx' mutex(9) held. in_pcbnotifyall() and in6_pcbnotify are the
last list users, so switch them to in_pcb_iterator() too, moreover they
already do in_pcb_is_iterator() check.

Note, in_pcb_iterator() does necessary reference couter handling,
unlocked `inp' dereference is safe.

ok bluhm
This commit is contained in:
mvs 2024-12-21 00:10:04 +00:00
parent 77d0f8231d
commit 8ee0399bd2
3 changed files with 15 additions and 48 deletions
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34
sys/netinet/in_pcb.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: in_pcb.c,v 1.305 2024/11/05 22:44:20 bluhm Exp $ */
/* $OpenBSD: in_pcb.c,v 1.306 2024/12/21 00:10:04 mvs Exp $ */
/* $NetBSD: in_pcb.c,v 1.25 1996/02/13 23:41:53 christos Exp $ */
/*
@ -179,7 +179,6 @@ void
in_pcbinit(struct inpcbtable *table, int hashsize)
{
mtx_init(&table->inpt_mtx, IPL_SOFTNET);
rw_init(&table->inpt_notify, "inpnotify");
TAILQ_INIT(&table->inpt_queue);
table->inpt_hashtbl = hashinit(hashsize, M_PCB, M_WAITOK,
&table->inpt_mask);
@ -763,8 +762,8 @@ void
in_pcbnotifyall(struct inpcbtable *table, const struct sockaddr_in *dst,
u_int rtable, int errno, void (*notify)(struct inpcb *, int))
{
SIMPLEQ_HEAD(, inpcb) inpcblist;
struct inpcb *inp;
struct inpcb_iterator iter = { .inp_table = NULL };
struct inpcb *inp = NULL;
u_int rdomain;
if (dst->sin_addr.s_addr == INADDR_ANY)
@ -772,39 +771,20 @@ in_pcbnotifyall(struct inpcbtable *table, const struct sockaddr_in *dst,
if (notify == NULL)
return;
/*
* Use a temporary notify list protected by rwlock to run over
* selected PCB. This is necessary as the list of all PCB is
* protected by a mutex. Notify may call ip_output() eventually
* which may sleep as pf lock is a rwlock. Also the SRP
* implementation of the routing table might sleep.
* The same inp_notify list entry and inpt_notify rwlock are
* used for UDP multicast and raw IP delivery.
*/
SIMPLEQ_INIT(&inpcblist);
rdomain = rtable_l2(rtable);
rw_enter_write(&table->inpt_notify);
mtx_enter(&table->inpt_mtx);
TAILQ_FOREACH(inp, &table->inpt_queue, inp_queue) {
if (in_pcb_is_iterator(inp))
continue;
while ((inp = in_pcb_iterator(table, inp, &iter)) != NULL) {
KASSERT(!ISSET(inp->inp_flags, INP_IPV6));
if (inp->inp_faddr.s_addr != dst->sin_addr.s_addr ||
rtable_l2(inp->inp_rtableid) != rdomain) {
continue;
}
in_pcbref(inp);
SIMPLEQ_INSERT_TAIL(&inpcblist, inp, inp_notify);
mtx_leave(&table->inpt_mtx);
(*notify)(inp, errno);
mtx_enter(&table->inpt_mtx);
}
mtx_leave(&table->inpt_mtx);
while ((inp = SIMPLEQ_FIRST(&inpcblist)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&inpcblist, inp_notify);
(*notify)(inp, errno);
in_pcbunref(inp);
}
rw_exit_write(&table->inpt_notify);
}
/*

5
sys/netinet/in_pcb.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: in_pcb.h,v 1.159 2024/11/05 10:49:23 bluhm Exp $ */
/* $OpenBSD: in_pcb.h,v 1.160 2024/12/21 00:10:04 mvs Exp $ */
/* $NetBSD: in_pcb.h,v 1.14 1996/02/13 23:42:00 christos Exp $ */
/*
@ -79,7 +79,6 @@
* I immutable after creation
* N net lock
* t inpt_mtx pcb table mutex
* y inpt_notify pcb table rwlock for notify
* L pf_inp_mtx link pf to inp mutex
* s so_lock socket rwlock
*/
@ -128,7 +127,6 @@ struct inpcb {
LIST_ENTRY(inpcb) inp_hash; /* [t] local and foreign hash */
LIST_ENTRY(inpcb) inp_lhash; /* [t] local port hash */
TAILQ_ENTRY(inpcb) inp_queue; /* [t] inet PCB queue */
SIMPLEQ_ENTRY(inpcb) inp_notify; /* [y] notify or udp append */
struct inpcbtable *inp_table; /* [I] inet queue/hash table */
union inpaddru inp_faddru; /* [t] Foreign address. */
union inpaddru inp_laddru; /* [t] Local address. */
@ -194,7 +192,6 @@ in_pcb_is_iterator(struct inpcb *inp)
struct inpcbtable {
struct mutex inpt_mtx; /* protect queue and hash */
struct rwlock inpt_notify; /* protect inp_notify list */
TAILQ_HEAD(inpthead, inpcb) inpt_queue; /* [t] inet PCB queue */
struct inpcbhead *inpt_hashtbl; /* [t] local and foreign hash */
struct inpcbhead *inpt_lhashtbl; /* [t] local port hash */

24
sys/netinet6/in6_pcb.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: in6_pcb.c,v 1.145 2024/11/05 10:49:23 bluhm Exp $ */
/* $OpenBSD: in6_pcb.c,v 1.146 2024/12/21 00:10:04 mvs Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -427,8 +427,8 @@ in6_pcbnotify(struct inpcbtable *table, const struct sockaddr_in6 *dst,
uint fport_arg, const struct sockaddr_in6 *src, uint lport_arg,
u_int rtable, int cmd, void *cmdarg, void (*notify)(struct inpcb *, int))
{
SIMPLEQ_HEAD(, inpcb) inpcblist;
struct inpcb *inp;
struct inpcb_iterator iter = { .inp_table = NULL };
struct inpcb *inp = NULL;
u_short fport = fport_arg, lport = lport_arg;
struct sockaddr_in6 sa6_src;
int errno;
@ -474,13 +474,9 @@ in6_pcbnotify(struct inpcbtable *table, const struct sockaddr_in6 *dst,
if (notify == NULL)
return;
SIMPLEQ_INIT(&inpcblist);
rdomain = rtable_l2(rtable);
rw_enter_write(&table->inpt_notify);
mtx_enter(&table->inpt_mtx);
TAILQ_FOREACH(inp, &table->inpt_queue, inp_queue) {
if (in_pcb_is_iterator(inp))
continue;
while ((inp = in_pcb_iterator(table, inp, &iter)) != NULL) {
KASSERT(ISSET(inp->inp_flags, INP_IPV6));
/*
@ -546,17 +542,11 @@ in6_pcbnotify(struct inpcbtable *table, const struct sockaddr_in6 *dst,
continue;
}
do_notify:
in_pcbref(inp);
SIMPLEQ_INSERT_TAIL(&inpcblist, inp, inp_notify);
mtx_leave(&table->inpt_mtx);
(*notify)(inp, errno);
mtx_enter(&table->inpt_mtx);
}
mtx_leave(&table->inpt_mtx);
while ((inp = SIMPLEQ_FIRST(&inpcblist)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&inpcblist, inp_notify);
(*notify)(inp, errno);
in_pcbunref(inp);
}
rw_exit_write(&table->inpt_notify);
}
struct rtentry *