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Merge fixes from p4:

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* Tighten v1 query input processing.
 * Borrow changes from MLDv2 for how general queries are processed.
   * Do address field validation upfront before accepting input.
   * Do NOT switch protocol version if old querier present timer active.
 * Always clear IGMPv3 state in igmp_v3_cancel_link_timers().
 * Update comments.

Tested by:	deeptech71 at gmail dot com
This commit is contained in:
Bruce M Simpson 2009-06-01 15:30:18 +00:00
parent ed54411c19
commit b01c90a31a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=193231
1 changed files with 133 additions and 85 deletions
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218
sys/netinet/igmp.c
View File

@ -98,7 +98,8 @@ static void igmp_final_leave(struct in_multi *, struct igmp_ifinfo *);
static int igmp_handle_state_change(struct in_multi *,
struct igmp_ifinfo *);
static int igmp_initial_join(struct in_multi *, struct igmp_ifinfo *);
static int igmp_input_v1_query(struct ifnet *, const struct ip *);
static int igmp_input_v1_query(struct ifnet *, const struct ip *,
const struct igmp *);
static int igmp_input_v2_query(struct ifnet *, const struct ip *,
const struct igmp *);
static int igmp_input_v3_query(struct ifnet *, const struct ip *,
@ -702,7 +703,8 @@ igi_delete_locked(const struct ifnet *ifp)
* VIMAGE: The curvnet pointer is derived from the input ifp.
*/
static int
igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip)
igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip,
const struct igmp *igmp)
{
INIT_VNET_INET(ifp->if_vnet);
struct ifmultiaddr *ifma;
@ -710,20 +712,18 @@ igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip)
struct in_multi *inm;
/*
* IGMPv1 General Queries SHOULD always addressed to 224.0.0.1.
* IGMPv1 Host Mmembership Queries SHOULD always be addressed to
* 224.0.0.1. They are always treated as General Queries.
* igmp_group is always ignored. Do not drop it as a userland
* daemon may wish to see it.
* XXX SMPng: unlocked increments in igmpstat assumed atomic.
*/
if (!in_allhosts(ip->ip_dst)) {
if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) {
IGMPSTAT_INC(igps_rcv_badqueries);
return (0);
}
IGMPSTAT_INC(igps_rcv_gen_queries);
/*
* Switch to IGMPv1 host compatibility mode.
*/
IN_MULTI_LOCK();
IGMP_LOCK();
@ -736,6 +736,9 @@ igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip)
goto out_locked;
}
/*
* Switch to IGMPv1 host compatibility mode.
*/
igmp_set_version(igi, IGMP_VERSION_1);
CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname);
@ -793,12 +796,29 @@ igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip,
struct ifmultiaddr *ifma;
struct igmp_ifinfo *igi;
struct in_multi *inm;
int is_general_query;
uint16_t timer;
is_general_query = 0;
/*
* Perform lazy allocation of IGMP link info if required,
* and switch to IGMPv2 host compatibility mode.
* Validate address fields upfront.
* XXX SMPng: unlocked increments in igmpstat assumed atomic.
*/
if (in_nullhost(igmp->igmp_group)) {
/*
* IGMPv2 General Query.
* If this was not sent to the all-hosts group, ignore it.
*/
if (!in_allhosts(ip->ip_dst))
return (0);
IGMPSTAT_INC(igps_rcv_gen_queries);
is_general_query = 1;
} else {
/* IGMPv2 Group-Specific Query. */
IGMPSTAT_INC(igps_rcv_group_queries);
}
IN_MULTI_LOCK();
IGMP_LOCK();
@ -811,16 +831,37 @@ igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip,
goto out_locked;
}
/*
* Ignore v2 query if in v1 Compatibility Mode.
*/
if (igi->igi_version == IGMP_VERSION_1)
goto out_locked;
igmp_set_version(igi, IGMP_VERSION_2);
timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE;
if (timer == 0)
timer = 1;
if (!in_nullhost(igmp->igmp_group)) {
if (is_general_query) {
/*
* IGMPv2 Group-Specific Query.
* If this is a group-specific IGMPv2 query, we need only
* For each reporting group joined on this
* interface, kick the report timer.
*/
CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)",
ifp, ifp->if_xname);
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
igmp_v2_update_group(inm, timer);
}
IF_ADDR_UNLOCK(ifp);
} else {
/*
* Group-specific IGMPv2 query, we need only
* look up the single group to process it.
*/
inm = inm_lookup(ifp, igmp->igmp_group);
@ -829,32 +870,6 @@ igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip,
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
igmp_v2_update_group(inm, timer);
}
IGMPSTAT_INC(igps_rcv_group_queries);
} else {
/*
* IGMPv2 General Query.
* If this was not sent to the all-hosts group, ignore it.
*/
if (in_allhosts(ip->ip_dst)) {
/*
* For each reporting group joined on this
* interface, kick the report timer.
*/
CTR2(KTR_IGMPV3,
"process v2 general query on ifp %p(%s)",
ifp, ifp->if_xname);
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
igmp_v2_update_group(inm, timer);
}
IF_ADDR_UNLOCK(ifp);
}
IGMPSTAT_INC(igps_rcv_gen_queries);
}
out_locked:
@ -933,10 +948,13 @@ igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
INIT_VNET_INET(ifp->if_vnet);
struct igmp_ifinfo *igi;
struct in_multi *inm;
int is_general_query;
uint32_t maxresp, nsrc, qqi;
uint16_t timer;
uint8_t qrv;
is_general_query = 0;
CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname);
maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */
@ -947,7 +965,7 @@ igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
/*
* Robustness must never be less than 2 for on-wire IGMPv3.
* FIXME: Check if ifp has IGIF_LOOPBACK set, as we make
* FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make
* an exception for interfaces whose IGMPv3 state changes
* are redirected to loopback (e.g. MANET).
*/
@ -970,6 +988,33 @@ igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
nsrc = ntohs(igmpv3->igmp_numsrc);
/*
* Validate address fields and versions upfront before
* accepting v3 query.
* XXX SMPng: Unlocked access to igmpstat counters here.
*/
if (in_nullhost(igmpv3->igmp_group)) {
/*
* IGMPv3 General Query.
*
* General Queries SHOULD be directed to 224.0.0.1.
* A general query with a source list has undefined
* behaviour; discard it.
*/
IGMPSTAT_INC(igps_rcv_gen_queries);
if (!in_allhosts(ip->ip_dst) || nsrc > 0) {
IGMPSTAT_INC(igps_rcv_badqueries);
return (0);
}
is_general_query = 1;
} else {
/* Group or group-source specific query. */
if (nsrc == 0)
IGMPSTAT_INC(igps_rcv_group_queries);
else
IGMPSTAT_INC(igps_rcv_gsr_queries);
}
IN_MULTI_LOCK();
IGMP_LOCK();
@ -982,8 +1027,19 @@ igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
goto out_locked;
}
igmp_set_version(igi, IGMP_VERSION_3);
/*
* Discard the v3 query if we're in Compatibility Mode.
* The RFC is not obviously worded that hosts need to stay in
* compatibility mode until the Old Version Querier Present
* timer expires.
*/
if (igi->igi_version != IGMP_VERSION_3) {
CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)",
igi->igi_version, ifp, ifp->if_xname);
goto out_locked;
}
igmp_set_version(igi, IGMP_VERSION_3);
igi->igi_rv = qrv;
igi->igi_qi = qqi;
igi->igi_qri = maxresp;
@ -991,41 +1047,23 @@ igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi,
maxresp);
if (in_nullhost(igmpv3->igmp_group)) {
if (is_general_query) {
/*
* IGMPv3 General Query.
* Schedule a current-state report on this ifp for
* all groups, possibly containing source lists.
*/
IGMPSTAT_INC(igps_rcv_gen_queries);
if (!in_allhosts(ip->ip_dst) || nsrc > 0) {
/*
* General Queries SHOULD be directed to 224.0.0.1.
* A general query with a source list has undefined
* behaviour; discard it.
*/
IGMPSTAT_INC(igps_rcv_badqueries);
goto out_locked;
}
CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)",
ifp, ifp->if_xname);
/*
* If there is a pending General Query response
* scheduled earlier than the selected delay, do
* not schedule any other reports.
* Otherwise, reset the interface timer.
*/
CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)",
ifp, ifp->if_xname);
if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) {
igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer);
V_interface_timers_running = 1;
}
} else {
/*
* IGMPv3 Group-specific or Group-and-source-specific Query.
*
* Group-source-specific queries are throttled on
* a per-group basis to defeat denial-of-service attempts.
* Queries for groups we are not a member of on this
@ -1035,7 +1073,6 @@ igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
if (inm == NULL)
goto out_locked;
if (nsrc > 0) {
IGMPSTAT_INC(igps_rcv_gsr_queries);
if (!ratecheck(&inm->inm_lastgsrtv,
&V_igmp_gsrdelay)) {
CTR1(KTR_IGMPV3, "%s: GS query throttled.",
@ -1043,8 +1080,6 @@ igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
IGMPSTAT_INC(igps_drop_gsr_queries);
goto out_locked;
}
} else {
IGMPSTAT_INC(igps_rcv_group_queries);
}
CTR3(KTR_IGMPV3, "process v3 %s query on ifp %p(%s)",
inet_ntoa(igmpv3->igmp_group), ifp, ifp->if_xname);
@ -1467,7 +1502,7 @@ igmp_input(struct mbuf *m, int off)
IGMPSTAT_INC(igps_rcv_v1v2_queries);
if (!V_igmp_v1enable)
break;
if (igmp_input_v1_query(ifp, ip) != 0) {
if (igmp_input_v1_query(ifp, ip, igmp) != 0) {
m_freem(m);
return;
}
@ -1909,6 +1944,7 @@ igmp_v3_suppress_group_record(struct in_multi *inm)
static void
igmp_set_version(struct igmp_ifinfo *igi, const int version)
{
int old_version_timer;
IGMP_LOCK_ASSERT();
@ -1916,7 +1952,6 @@ igmp_set_version(struct igmp_ifinfo *igi, const int version)
version, igi->igi_ifp, igi->igi_ifp->if_xname);
if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) {
int old_version_timer;
/*
* Compute the "Older Version Querier Present" timer as per
* Section 8.12.
@ -1949,6 +1984,11 @@ igmp_set_version(struct igmp_ifinfo *igi, const int version)
/*
* Cancel pending IGMPv3 timers for the given link and all groups
* joined on it; state-change, general-query, and group-query timers.
*
* Only ever called on a transition from v3 to Compatibility mode. Kill
* the timers stone dead (this may be expensive for large N groups), they
* will be restarted if Compatibility Mode deems that they must be due to
* query processing.
*/
static void
igmp_v3_cancel_link_timers(struct igmp_ifinfo *igi)
@ -1965,21 +2005,21 @@ igmp_v3_cancel_link_timers(struct igmp_ifinfo *igi)
IGMP_LOCK_ASSERT();
/*
* Fast-track this potentially expensive operation
* by checking all the global 'timer pending' flags.
* Stop the v3 General Query Response on this link stone dead.
* If fasttimo is woken up due to V_interface_timers_running,
* the flag will be cleared if there are no pending link timers.
*/
if (!V_interface_timers_running &&
!V_state_change_timers_running &&
!V_current_state_timers_running)
return;
igi->igi_v3_timer = 0;
/*
* Now clear the current-state and state-change report timers
* for all memberships scoped to this link.
*/
ifp = igi->igi_ifp;
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET)
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
switch (inm->inm_state) {
@ -1989,12 +2029,19 @@ igmp_v3_cancel_link_timers(struct igmp_ifinfo *igi)
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
/*
* These states are either not relevant in v3 mode,
* or are unreported. Do nothing.
*/
break;
case IGMP_LEAVING_MEMBER:
/*
* If we are leaving the group and switching
* IGMP version, we need to release the final
* reference held for issuing the INCLUDE {}.
* If we are leaving the group and switching to
* compatibility mode, we need to release the final
* reference held for issuing the INCLUDE {}, and
* transition to REPORTING to ensure the host leave
* message is sent upstream to the old querier --
* transition to NOT would lose the leave and race.
*
* SMPNG: Must drop and re-acquire IF_ADDR_LOCK
* around inm_release_locked(), as it is not
@ -2009,15 +2056,16 @@ igmp_v3_cancel_link_timers(struct igmp_ifinfo *igi)
inm_clear_recorded(inm);
/* FALLTHROUGH */
case IGMP_REPORTING_MEMBER:
inm->inm_sctimer = 0;
inm->inm_timer = 0;
inm->inm_state = IGMP_REPORTING_MEMBER;
/*
* Free any pending IGMPv3 state-change records.
*/
_IF_DRAIN(&inm->inm_scq);
break;
}
/*
* Always clear state-change and group report timers.
* Free any pending IGMPv3 state-change records.
*/
inm->inm_sctimer = 0;
inm->inm_timer = 0;
_IF_DRAIN(&inm->inm_scq);
}
IF_ADDR_UNLOCK(ifp);
}