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lock ip fragment queues

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Submitted by:	Robert Watson <rwatson@freebsd.org>
Obtained from:	BSD/OS
This commit is contained in:
Sam Leffler 2003-09-05 00:10:33 +00:00
parent 26f91065e7
commit 2fad1e931e
1 changed files with 18 additions and 0 deletions
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18
sys/netinet/ip_input.c
View file

@ -182,6 +182,12 @@ SYSCTL_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RW,
(((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
static TAILQ_HEAD(ipqhead, ipq) ipq[IPREASS_NHASH];
struct mtx ipqlock;
#define IPQ_LOCK() mtx_lock(&ipqlock)
#define IPQ_UNLOCK() mtx_unlock(&ipqlock)
#define IPQ_LOCK_INIT() mtx_init(&ipqlock, "ipqlock", NULL, MTX_DEF);
#define IPQ_LOCK_ASSERT() mtx_assert(&ipqlock, MA_OWNED);
#ifdef IPCTL_DEFMTU
SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
@ -257,6 +263,7 @@ ip_init()
pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
ip_protox[pr->pr_protocol] = pr - inetsw;
IPQ_LOCK_INIT();
for (i = 0; i < IPREASS_NHASH; i++)
TAILQ_INIT(&ipq[i]);
@ -746,6 +753,7 @@ ours:
}
sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
IPQ_LOCK();
/*
* Look for queue of fragments
* of this datagram.
@ -799,6 +807,7 @@ found:
* that's a non-zero multiple of 8 bytes.
*/
if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
IPQ_UNLOCK();
ipstat.ips_toosmall++; /* XXX */
goto bad;
}
@ -816,6 +825,7 @@ found:
m->m_pkthdr.header = ip;
m = ip_reass(m,
&ipq[sum], fp, &divert_info, &args.divert_rule);
IPQ_UNLOCK();
if (m == 0)
return;
ipstat.ips_reassembled++;
@ -974,6 +984,8 @@ ip_reass(struct mbuf *m, struct ipqhead *head, struct ipq *fp,
int hlen = ip->ip_hl << 2;
int i, next;
IPQ_LOCK_ASSERT();
/*
* Presence of header sizes in mbufs
* would confuse code below.
@ -1203,6 +1215,8 @@ ip_freef(fhp, fp)
{
register struct mbuf *q;
IPQ_LOCK_ASSERT();
while (fp->ipq_frags) {
q = fp->ipq_frags;
fp->ipq_frags = q->m_nextpkt;
@ -1225,6 +1239,7 @@ ip_slowtimo()
int s = splnet();
int i;
IPQ_LOCK();
for (i = 0; i < IPREASS_NHASH; i++) {
for(fp = TAILQ_FIRST(&ipq[i]); fp;) {
struct ipq *fpp;
@ -1251,6 +1266,7 @@ ip_slowtimo()
}
}
}
IPQ_UNLOCK();
ipflow_slowtimo();
splx(s);
}
@ -1263,6 +1279,7 @@ ip_drain()
{
int i;
IPQ_LOCK();
for (i = 0; i < IPREASS_NHASH; i++) {
while(!TAILQ_EMPTY(&ipq[i])) {
ipstat.ips_fragdropped +=
@ -1270,6 +1287,7 @@ ip_drain()
ip_freef(&ipq[i], TAILQ_FIRST(&ipq[i]));
}
}
IPQ_UNLOCK();
in_rtqdrain();
}