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Split up ip_drain() into an outer lock and iterator part and

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a "locked" version that will only handle a single network stack
instance. The latter is called directly from ip_destroy().

Hook up an ip_destroy() function to release resources from the
legacy IP network layer upon virtual network stack teardown.

Sponsored by:	ISPsystem
Reviewed by:	rwatson
MFC After:	5 days
This commit is contained in:
Bjoern A. Zeeb 2010-02-20 19:59:52 +00:00
parent 507377a656
commit 9802380e41
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=204140
3 changed files with 40 additions and 8 deletions
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3
sys/netinet/in_proto.c
View File

@ -114,6 +114,9 @@ struct protosw inetsw[] = {
.pr_domain = &inetdomain,
.pr_protocol = IPPROTO_IP,
.pr_init = ip_init,
#ifdef VIMAGE
.pr_destroy = ip_destroy,
#endif
.pr_slowtimo = ip_slowtimo,
.pr_drain = ip_drain,
.pr_usrreqs = &nousrreqs

42
sys/netinet/ip_input.c
View File

@ -199,6 +199,7 @@ static struct mtx ipqlock;
static void maxnipq_update(void);
static void ipq_zone_change(void *);
static void ip_drain_locked(void);
SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, fragpackets, CTLFLAG_RD,
&VNET_NAME(nipq), 0,
@ -368,6 +369,22 @@ ip_init(void)
netisr_register(&ip_nh);
}
#ifdef VIMAGE
void
ip_destroy(void)
{
/* Cleanup in_ifaddr hash table; should be empty. */
hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask);
IPQ_LOCK();
ip_drain_locked();
IPQ_UNLOCK();
uma_zdestroy(V_ipq_zone);
}
#endif
void
ip_fini(void *xtp)
{
@ -1237,23 +1254,32 @@ ip_slowtimo(void)
/*
* Drain off all datagram fragments.
*/
static void
ip_drain_locked(void)
{
int i;
IPQ_LOCK_ASSERT();
for (i = 0; i < IPREASS_NHASH; i++) {
while(!TAILQ_EMPTY(&V_ipq[i])) {
IPSTAT_ADD(ips_fragdropped,
TAILQ_FIRST(&V_ipq[i])->ipq_nfrags);
ip_freef(&V_ipq[i], TAILQ_FIRST(&V_ipq[i]));
}
}
}
void
ip_drain(void)
{
VNET_ITERATOR_DECL(vnet_iter);
int i;
VNET_LIST_RLOCK_NOSLEEP();
IPQ_LOCK();
VNET_FOREACH(vnet_iter) {
CURVNET_SET(vnet_iter);
for (i = 0; i < IPREASS_NHASH; i++) {
while(!TAILQ_EMPTY(&V_ipq[i])) {
IPSTAT_ADD(ips_fragdropped,
TAILQ_FIRST(&V_ipq[i])->ipq_nfrags);
ip_freef(&V_ipq[i], TAILQ_FIRST(&V_ipq[i]));
}
}
ip_drain_locked();
CURVNET_RESTORE();
}
IPQ_UNLOCK();

3
sys/netinet/ip_var.h
View File

@ -212,6 +212,9 @@ int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
u_long if_hwassist_flags, int sw_csum);
void ip_forward(struct mbuf *m, int srcrt);
void ip_init(void);
#ifdef VIMAGE
void ip_destroy(void);
#endif
extern int
(*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
struct ip_moptions *);