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Code Issues Releases Activity

Fix a problem whereby enqueued IGMPv3 filter list changes would be

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incorrectly output, if the RB-tree enumeration happened to reuse the
same chain for a mode switch: that is, both ALLOW and BLOCK records
were appended for the same group, in the same mbuf packet chain.

This was introduced during an mbuf chain layout bug fix involving
m_getptr(), which obviously cannot count from offset 0 on the
second pass through the RB-tree when serializing the IGMPv3
group records into the pending mbuf chain.

Cut over to KTR_INET for IGMPv3 CTR usage.
This commit is contained in:
Bruce M Simpson 2009-04-29 10:12:01 +00:00
parent 4e6430a67f
commit 31a3e65dc2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=191657
1 changed files with 18 additions and 11 deletions
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29
sys/netinet/igmp.c
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@ -86,7 +86,7 @@ __FBSDID("$FreeBSD$");
#include <security/mac/mac_framework.h>
#ifndef KTR_IGMPV3
#define KTR_IGMPV3 KTR_SUBSYS
#define KTR_IGMPV3 KTR_INET
#endif
static struct igmp_ifinfo *
@ -2983,7 +2983,7 @@ igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
struct ip_msource *ims, *nims;
struct mbuf *m, *m0, *md;
in_addr_t naddr;
int m0srcs, nbytes, off, rsrcs, schanged;
int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
int nallow, nblock;
uint8_t mode, now, then;
rectype_t crt, drt, nrt;
@ -3001,6 +3001,7 @@ igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
nrt = REC_NONE; /* record type for current node */
m0srcs = 0; /* # source which will fit in current mbuf chain */
nbytes = 0; /* # of bytes appended to group's state-change queue */
npbytes = 0; /* # of bytes appended this packet */
rsrcs = 0; /* # sources encoded in current record */
schanged = 0; /* # nodes encoded in overall filter change */
nallow = 0; /* # of source entries in ALLOW_NEW */
@ -3047,6 +3048,7 @@ igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
sizeof(struct igmp_grouprec)) /
sizeof(in_addr_t);
npbytes = 0;
CTR1(KTR_IGMPV3,
"%s: allocated new packet", __func__);
}
@ -3066,15 +3068,19 @@ igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
"%s: m_append() failed", __func__);
return (-ENOMEM);
}
nbytes += sizeof(struct igmp_grouprec);
if (m == m0) {
md = m_last(m);
pig = (struct igmp_grouprec *)(mtod(md,
uint8_t *) + md->m_len - nbytes);
} else {
md = m_getptr(m, 0, &off);
npbytes += sizeof(struct igmp_grouprec);
if (m != m0) {
/* new packet; offset in c hain */
md = m_getptr(m, npbytes -
sizeof(struct igmp_grouprec), &off);
pig = (struct igmp_grouprec *)(mtod(md,
uint8_t *) + off);
} else {
/* current packet; offset from last append */
md = m_last(m);
pig = (struct igmp_grouprec *)(mtod(md,
uint8_t *) + md->m_len -
sizeof(struct igmp_grouprec));
}
/*
* Begin walking the tree for this record type
@ -3133,7 +3139,7 @@ igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
* pass, back out of allocations.
*/
if (rsrcs == 0) {
nbytes -= sizeof(struct igmp_grouprec);
npbytes -= sizeof(struct igmp_grouprec);
if (m != m0) {
CTR1(KTR_IGMPV3,
"%s: m_free(m)", __func__);
@ -3146,7 +3152,7 @@ igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
}
continue;
}
nbytes += (rsrcs * sizeof(in_addr_t));
npbytes += (rsrcs * sizeof(in_addr_t));
if (crt == REC_ALLOW)
pig->ig_type = IGMP_ALLOW_NEW_SOURCES;
else if (crt == REC_BLOCK)
@ -3159,6 +3165,7 @@ igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
m->m_pkthdr.PH_vt.vt_nrecs++;
if (m != m0)
_IF_ENQUEUE(ifq, m);
nbytes += npbytes;
} while (nims != NULL);
drt |= crt;
crt = (~crt & REC_FULL);