mirror of https://gitee.com/openkylin/linux.git
3079 lines
73 KiB
C
3079 lines
73 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Linux NET3: Internet Group Management Protocol [IGMP]
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*
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* This code implements the IGMP protocol as defined in RFC1112. There has
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* been a further revision of this protocol since which is now supported.
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*
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* If you have trouble with this module be careful what gcc you have used,
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* the older version didn't come out right using gcc 2.5.8, the newer one
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* seems to fall out with gcc 2.6.2.
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*
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* Authors:
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* Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* Fixes:
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*
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* Alan Cox : Added lots of __inline__ to optimise
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* the memory usage of all the tiny little
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* functions.
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* Alan Cox : Dumped the header building experiment.
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* Alan Cox : Minor tweaks ready for multicast routing
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* and extended IGMP protocol.
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* Alan Cox : Removed a load of inline directives. Gcc 2.5.8
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* writes utterly bogus code otherwise (sigh)
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* fixed IGMP loopback to behave in the manner
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* desired by mrouted, fixed the fact it has been
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* broken since 1.3.6 and cleaned up a few minor
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* points.
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*
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* Chih-Jen Chang : Tried to revise IGMP to Version 2
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* Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
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* The enhancements are mainly based on Steve Deering's
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* ipmulti-3.5 source code.
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* Chih-Jen Chang : Added the igmp_get_mrouter_info and
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* Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
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* the mrouted version on that device.
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* Chih-Jen Chang : Added the max_resp_time parameter to
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* Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
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* to identify the multicast router version
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* and do what the IGMP version 2 specified.
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* Chih-Jen Chang : Added a timer to revert to IGMP V2 router
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* Tsu-Sheng Tsao if the specified time expired.
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* Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
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* Alan Cox : Use GFP_ATOMIC in the right places.
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* Christian Daudt : igmp timer wasn't set for local group
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* memberships but was being deleted,
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* which caused a "del_timer() called
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* from %p with timer not initialized\n"
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* message (960131).
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* Christian Daudt : removed del_timer from
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* igmp_timer_expire function (960205).
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* Christian Daudt : igmp_heard_report now only calls
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* igmp_timer_expire if tm->running is
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* true (960216).
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* Malcolm Beattie : ttl comparison wrong in igmp_rcv made
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* igmp_heard_query never trigger. Expiry
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* miscalculation fixed in igmp_heard_query
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* and random() made to return unsigned to
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* prevent negative expiry times.
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* Alexey Kuznetsov: Wrong group leaving behaviour, backport
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* fix from pending 2.1.x patches.
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* Alan Cox: Forget to enable FDDI support earlier.
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* Alexey Kuznetsov: Fixed leaving groups on device down.
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* Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
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* David L Stevens: IGMPv3 support, with help from
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* Vinay Kulkarni
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/inetdevice.h>
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#include <linux/igmp.h>
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#include <linux/if_arp.h>
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#include <linux/rtnetlink.h>
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#include <linux/times.h>
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#include <linux/pkt_sched.h>
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#include <linux/byteorder/generic.h>
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#include <net/net_namespace.h>
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#include <net/arp.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/route.h>
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#include <net/sock.h>
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#include <net/checksum.h>
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#include <net/inet_common.h>
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#include <linux/netfilter_ipv4.h>
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#ifdef CONFIG_IP_MROUTE
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#include <linux/mroute.h>
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#endif
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#ifdef CONFIG_PROC_FS
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#endif
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#ifdef CONFIG_IP_MULTICAST
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/* Parameter names and values are taken from igmp-v2-06 draft */
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#define IGMP_QUERY_INTERVAL (125*HZ)
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#define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
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#define IGMP_INITIAL_REPORT_DELAY (1)
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/* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
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* IGMP specs require to report membership immediately after
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* joining a group, but we delay the first report by a
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* small interval. It seems more natural and still does not
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* contradict to specs provided this delay is small enough.
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*/
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#define IGMP_V1_SEEN(in_dev) \
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(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
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IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
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((in_dev)->mr_v1_seen && \
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time_before(jiffies, (in_dev)->mr_v1_seen)))
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#define IGMP_V2_SEEN(in_dev) \
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(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
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IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
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((in_dev)->mr_v2_seen && \
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time_before(jiffies, (in_dev)->mr_v2_seen)))
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static int unsolicited_report_interval(struct in_device *in_dev)
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{
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int interval_ms, interval_jiffies;
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if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
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interval_ms = IN_DEV_CONF_GET(
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in_dev,
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IGMPV2_UNSOLICITED_REPORT_INTERVAL);
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else /* v3 */
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interval_ms = IN_DEV_CONF_GET(
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in_dev,
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IGMPV3_UNSOLICITED_REPORT_INTERVAL);
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interval_jiffies = msecs_to_jiffies(interval_ms);
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/* _timer functions can't handle a delay of 0 jiffies so ensure
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* we always return a positive value.
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*/
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if (interval_jiffies <= 0)
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interval_jiffies = 1;
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return interval_jiffies;
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}
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static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
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gfp_t gfp);
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static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
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static void igmpv3_clear_delrec(struct in_device *in_dev);
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static int sf_setstate(struct ip_mc_list *pmc);
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static void sf_markstate(struct ip_mc_list *pmc);
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#endif
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static void ip_mc_clear_src(struct ip_mc_list *pmc);
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static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
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int sfcount, __be32 *psfsrc, int delta);
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static void ip_ma_put(struct ip_mc_list *im)
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{
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if (refcount_dec_and_test(&im->refcnt)) {
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in_dev_put(im->interface);
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kfree_rcu(im, rcu);
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}
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}
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#define for_each_pmc_rcu(in_dev, pmc) \
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for (pmc = rcu_dereference(in_dev->mc_list); \
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pmc != NULL; \
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pmc = rcu_dereference(pmc->next_rcu))
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#define for_each_pmc_rtnl(in_dev, pmc) \
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for (pmc = rtnl_dereference(in_dev->mc_list); \
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pmc != NULL; \
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pmc = rtnl_dereference(pmc->next_rcu))
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static void ip_sf_list_clear_all(struct ip_sf_list *psf)
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{
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struct ip_sf_list *next;
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while (psf) {
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next = psf->sf_next;
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kfree(psf);
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psf = next;
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}
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}
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#ifdef CONFIG_IP_MULTICAST
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/*
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* Timer management
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*/
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static void igmp_stop_timer(struct ip_mc_list *im)
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{
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spin_lock_bh(&im->lock);
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if (del_timer(&im->timer))
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refcount_dec(&im->refcnt);
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im->tm_running = 0;
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im->reporter = 0;
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im->unsolicit_count = 0;
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spin_unlock_bh(&im->lock);
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}
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/* It must be called with locked im->lock */
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static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
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{
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int tv = prandom_u32() % max_delay;
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im->tm_running = 1;
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if (!mod_timer(&im->timer, jiffies+tv+2))
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refcount_inc(&im->refcnt);
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}
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static void igmp_gq_start_timer(struct in_device *in_dev)
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{
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int tv = prandom_u32() % in_dev->mr_maxdelay;
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unsigned long exp = jiffies + tv + 2;
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if (in_dev->mr_gq_running &&
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time_after_eq(exp, (in_dev->mr_gq_timer).expires))
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return;
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in_dev->mr_gq_running = 1;
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if (!mod_timer(&in_dev->mr_gq_timer, exp))
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in_dev_hold(in_dev);
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}
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static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
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{
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int tv = prandom_u32() % delay;
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if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
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in_dev_hold(in_dev);
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}
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static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
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{
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spin_lock_bh(&im->lock);
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im->unsolicit_count = 0;
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if (del_timer(&im->timer)) {
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if ((long)(im->timer.expires-jiffies) < max_delay) {
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add_timer(&im->timer);
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im->tm_running = 1;
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spin_unlock_bh(&im->lock);
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return;
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}
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refcount_dec(&im->refcnt);
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}
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igmp_start_timer(im, max_delay);
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spin_unlock_bh(&im->lock);
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}
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/*
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* Send an IGMP report.
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*/
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#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
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static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
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int gdeleted, int sdeleted)
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{
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switch (type) {
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case IGMPV3_MODE_IS_INCLUDE:
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case IGMPV3_MODE_IS_EXCLUDE:
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if (gdeleted || sdeleted)
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return 0;
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if (!(pmc->gsquery && !psf->sf_gsresp)) {
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if (pmc->sfmode == MCAST_INCLUDE)
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return 1;
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/* don't include if this source is excluded
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* in all filters
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*/
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if (psf->sf_count[MCAST_INCLUDE])
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return type == IGMPV3_MODE_IS_INCLUDE;
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return pmc->sfcount[MCAST_EXCLUDE] ==
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psf->sf_count[MCAST_EXCLUDE];
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}
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return 0;
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case IGMPV3_CHANGE_TO_INCLUDE:
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if (gdeleted || sdeleted)
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return 0;
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return psf->sf_count[MCAST_INCLUDE] != 0;
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case IGMPV3_CHANGE_TO_EXCLUDE:
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if (gdeleted || sdeleted)
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return 0;
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if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
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psf->sf_count[MCAST_INCLUDE])
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return 0;
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return pmc->sfcount[MCAST_EXCLUDE] ==
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psf->sf_count[MCAST_EXCLUDE];
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case IGMPV3_ALLOW_NEW_SOURCES:
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if (gdeleted || !psf->sf_crcount)
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return 0;
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return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
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case IGMPV3_BLOCK_OLD_SOURCES:
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if (pmc->sfmode == MCAST_INCLUDE)
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return gdeleted || (psf->sf_crcount && sdeleted);
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return psf->sf_crcount && !gdeleted && !sdeleted;
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}
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return 0;
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}
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static int
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igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
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{
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struct ip_sf_list *psf;
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int scount = 0;
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for (psf = pmc->sources; psf; psf = psf->sf_next) {
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if (!is_in(pmc, psf, type, gdeleted, sdeleted))
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continue;
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scount++;
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}
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return scount;
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}
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/* source address selection per RFC 3376 section 4.2.13 */
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static __be32 igmpv3_get_srcaddr(struct net_device *dev,
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const struct flowi4 *fl4)
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{
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struct in_device *in_dev = __in_dev_get_rcu(dev);
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const struct in_ifaddr *ifa;
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if (!in_dev)
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return htonl(INADDR_ANY);
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in_dev_for_each_ifa_rcu(ifa, in_dev) {
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if (fl4->saddr == ifa->ifa_local)
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return fl4->saddr;
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}
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return htonl(INADDR_ANY);
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}
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static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
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{
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struct sk_buff *skb;
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struct rtable *rt;
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struct iphdr *pip;
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struct igmpv3_report *pig;
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struct net *net = dev_net(dev);
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struct flowi4 fl4;
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int hlen = LL_RESERVED_SPACE(dev);
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int tlen = dev->needed_tailroom;
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unsigned int size = mtu;
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while (1) {
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skb = alloc_skb(size + hlen + tlen,
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GFP_ATOMIC | __GFP_NOWARN);
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if (skb)
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break;
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size >>= 1;
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if (size < 256)
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return NULL;
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}
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skb->priority = TC_PRIO_CONTROL;
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rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
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0, 0,
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IPPROTO_IGMP, 0, dev->ifindex);
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if (IS_ERR(rt)) {
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kfree_skb(skb);
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return NULL;
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}
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skb_dst_set(skb, &rt->dst);
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skb->dev = dev;
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skb_reserve(skb, hlen);
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skb_tailroom_reserve(skb, mtu, tlen);
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skb_reset_network_header(skb);
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pip = ip_hdr(skb);
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skb_put(skb, sizeof(struct iphdr) + 4);
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pip->version = 4;
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pip->ihl = (sizeof(struct iphdr)+4)>>2;
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pip->tos = 0xc0;
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pip->frag_off = htons(IP_DF);
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pip->ttl = 1;
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pip->daddr = fl4.daddr;
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rcu_read_lock();
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pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
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rcu_read_unlock();
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pip->protocol = IPPROTO_IGMP;
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pip->tot_len = 0; /* filled in later */
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ip_select_ident(net, skb, NULL);
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((u8 *)&pip[1])[0] = IPOPT_RA;
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((u8 *)&pip[1])[1] = 4;
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((u8 *)&pip[1])[2] = 0;
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((u8 *)&pip[1])[3] = 0;
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skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
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skb_put(skb, sizeof(*pig));
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pig = igmpv3_report_hdr(skb);
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pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
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pig->resv1 = 0;
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pig->csum = 0;
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pig->resv2 = 0;
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pig->ngrec = 0;
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return skb;
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}
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static int igmpv3_sendpack(struct sk_buff *skb)
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{
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struct igmphdr *pig = igmp_hdr(skb);
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const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
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pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
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return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
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}
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static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
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{
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return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
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}
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static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
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int type, struct igmpv3_grec **ppgr, unsigned int mtu)
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{
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struct net_device *dev = pmc->interface->dev;
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struct igmpv3_report *pih;
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struct igmpv3_grec *pgr;
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if (!skb) {
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skb = igmpv3_newpack(dev, mtu);
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if (!skb)
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return NULL;
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}
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pgr = skb_put(skb, sizeof(struct igmpv3_grec));
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pgr->grec_type = type;
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pgr->grec_auxwords = 0;
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pgr->grec_nsrcs = 0;
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pgr->grec_mca = pmc->multiaddr;
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pih = igmpv3_report_hdr(skb);
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pih->ngrec = htons(ntohs(pih->ngrec)+1);
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*ppgr = pgr;
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return skb;
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}
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#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
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static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
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int type, int gdeleted, int sdeleted)
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{
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struct net_device *dev = pmc->interface->dev;
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struct net *net = dev_net(dev);
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struct igmpv3_report *pih;
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struct igmpv3_grec *pgr = NULL;
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struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
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int scount, stotal, first, isquery, truncate;
|
|
unsigned int mtu;
|
|
|
|
if (pmc->multiaddr == IGMP_ALL_HOSTS)
|
|
return skb;
|
|
if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
|
|
return skb;
|
|
|
|
mtu = READ_ONCE(dev->mtu);
|
|
if (mtu < IPV4_MIN_MTU)
|
|
return skb;
|
|
|
|
isquery = type == IGMPV3_MODE_IS_INCLUDE ||
|
|
type == IGMPV3_MODE_IS_EXCLUDE;
|
|
truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
|
|
type == IGMPV3_CHANGE_TO_EXCLUDE;
|
|
|
|
stotal = scount = 0;
|
|
|
|
psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
|
|
|
|
if (!*psf_list)
|
|
goto empty_source;
|
|
|
|
pih = skb ? igmpv3_report_hdr(skb) : NULL;
|
|
|
|
/* EX and TO_EX get a fresh packet, if needed */
|
|
if (truncate) {
|
|
if (pih && pih->ngrec &&
|
|
AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
|
|
if (skb)
|
|
igmpv3_sendpack(skb);
|
|
skb = igmpv3_newpack(dev, mtu);
|
|
}
|
|
}
|
|
first = 1;
|
|
psf_prev = NULL;
|
|
for (psf = *psf_list; psf; psf = psf_next) {
|
|
__be32 *psrc;
|
|
|
|
psf_next = psf->sf_next;
|
|
|
|
if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
|
|
psf_prev = psf;
|
|
continue;
|
|
}
|
|
|
|
/* Based on RFC3376 5.1. Should not send source-list change
|
|
* records when there is a filter mode change.
|
|
*/
|
|
if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
|
|
(!gdeleted && pmc->crcount)) &&
|
|
(type == IGMPV3_ALLOW_NEW_SOURCES ||
|
|
type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
|
|
goto decrease_sf_crcount;
|
|
|
|
/* clear marks on query responses */
|
|
if (isquery)
|
|
psf->sf_gsresp = 0;
|
|
|
|
if (AVAILABLE(skb) < sizeof(__be32) +
|
|
first*sizeof(struct igmpv3_grec)) {
|
|
if (truncate && !first)
|
|
break; /* truncate these */
|
|
if (pgr)
|
|
pgr->grec_nsrcs = htons(scount);
|
|
if (skb)
|
|
igmpv3_sendpack(skb);
|
|
skb = igmpv3_newpack(dev, mtu);
|
|
first = 1;
|
|
scount = 0;
|
|
}
|
|
if (first) {
|
|
skb = add_grhead(skb, pmc, type, &pgr, mtu);
|
|
first = 0;
|
|
}
|
|
if (!skb)
|
|
return NULL;
|
|
psrc = skb_put(skb, sizeof(__be32));
|
|
*psrc = psf->sf_inaddr;
|
|
scount++; stotal++;
|
|
if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
|
|
type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
|
|
decrease_sf_crcount:
|
|
psf->sf_crcount--;
|
|
if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
|
|
if (psf_prev)
|
|
psf_prev->sf_next = psf->sf_next;
|
|
else
|
|
*psf_list = psf->sf_next;
|
|
kfree(psf);
|
|
continue;
|
|
}
|
|
}
|
|
psf_prev = psf;
|
|
}
|
|
|
|
empty_source:
|
|
if (!stotal) {
|
|
if (type == IGMPV3_ALLOW_NEW_SOURCES ||
|
|
type == IGMPV3_BLOCK_OLD_SOURCES)
|
|
return skb;
|
|
if (pmc->crcount || isquery) {
|
|
/* make sure we have room for group header */
|
|
if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
|
|
igmpv3_sendpack(skb);
|
|
skb = NULL; /* add_grhead will get a new one */
|
|
}
|
|
skb = add_grhead(skb, pmc, type, &pgr, mtu);
|
|
}
|
|
}
|
|
if (pgr)
|
|
pgr->grec_nsrcs = htons(scount);
|
|
|
|
if (isquery)
|
|
pmc->gsquery = 0; /* clear query state on report */
|
|
return skb;
|
|
}
|
|
|
|
static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
|
|
{
|
|
struct sk_buff *skb = NULL;
|
|
struct net *net = dev_net(in_dev->dev);
|
|
int type;
|
|
|
|
if (!pmc) {
|
|
rcu_read_lock();
|
|
for_each_pmc_rcu(in_dev, pmc) {
|
|
if (pmc->multiaddr == IGMP_ALL_HOSTS)
|
|
continue;
|
|
if (ipv4_is_local_multicast(pmc->multiaddr) &&
|
|
!net->ipv4.sysctl_igmp_llm_reports)
|
|
continue;
|
|
spin_lock_bh(&pmc->lock);
|
|
if (pmc->sfcount[MCAST_EXCLUDE])
|
|
type = IGMPV3_MODE_IS_EXCLUDE;
|
|
else
|
|
type = IGMPV3_MODE_IS_INCLUDE;
|
|
skb = add_grec(skb, pmc, type, 0, 0);
|
|
spin_unlock_bh(&pmc->lock);
|
|
}
|
|
rcu_read_unlock();
|
|
} else {
|
|
spin_lock_bh(&pmc->lock);
|
|
if (pmc->sfcount[MCAST_EXCLUDE])
|
|
type = IGMPV3_MODE_IS_EXCLUDE;
|
|
else
|
|
type = IGMPV3_MODE_IS_INCLUDE;
|
|
skb = add_grec(skb, pmc, type, 0, 0);
|
|
spin_unlock_bh(&pmc->lock);
|
|
}
|
|
if (!skb)
|
|
return 0;
|
|
return igmpv3_sendpack(skb);
|
|
}
|
|
|
|
/*
|
|
* remove zero-count source records from a source filter list
|
|
*/
|
|
static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
|
|
{
|
|
struct ip_sf_list *psf_prev, *psf_next, *psf;
|
|
|
|
psf_prev = NULL;
|
|
for (psf = *ppsf; psf; psf = psf_next) {
|
|
psf_next = psf->sf_next;
|
|
if (psf->sf_crcount == 0) {
|
|
if (psf_prev)
|
|
psf_prev->sf_next = psf->sf_next;
|
|
else
|
|
*ppsf = psf->sf_next;
|
|
kfree(psf);
|
|
} else
|
|
psf_prev = psf;
|
|
}
|
|
}
|
|
|
|
static void kfree_pmc(struct ip_mc_list *pmc)
|
|
{
|
|
ip_sf_list_clear_all(pmc->sources);
|
|
ip_sf_list_clear_all(pmc->tomb);
|
|
kfree(pmc);
|
|
}
|
|
|
|
static void igmpv3_send_cr(struct in_device *in_dev)
|
|
{
|
|
struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
|
|
struct sk_buff *skb = NULL;
|
|
int type, dtype;
|
|
|
|
rcu_read_lock();
|
|
spin_lock_bh(&in_dev->mc_tomb_lock);
|
|
|
|
/* deleted MCA's */
|
|
pmc_prev = NULL;
|
|
for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
|
|
pmc_next = pmc->next;
|
|
if (pmc->sfmode == MCAST_INCLUDE) {
|
|
type = IGMPV3_BLOCK_OLD_SOURCES;
|
|
dtype = IGMPV3_BLOCK_OLD_SOURCES;
|
|
skb = add_grec(skb, pmc, type, 1, 0);
|
|
skb = add_grec(skb, pmc, dtype, 1, 1);
|
|
}
|
|
if (pmc->crcount) {
|
|
if (pmc->sfmode == MCAST_EXCLUDE) {
|
|
type = IGMPV3_CHANGE_TO_INCLUDE;
|
|
skb = add_grec(skb, pmc, type, 1, 0);
|
|
}
|
|
pmc->crcount--;
|
|
if (pmc->crcount == 0) {
|
|
igmpv3_clear_zeros(&pmc->tomb);
|
|
igmpv3_clear_zeros(&pmc->sources);
|
|
}
|
|
}
|
|
if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
|
|
if (pmc_prev)
|
|
pmc_prev->next = pmc_next;
|
|
else
|
|
in_dev->mc_tomb = pmc_next;
|
|
in_dev_put(pmc->interface);
|
|
kfree_pmc(pmc);
|
|
} else
|
|
pmc_prev = pmc;
|
|
}
|
|
spin_unlock_bh(&in_dev->mc_tomb_lock);
|
|
|
|
/* change recs */
|
|
for_each_pmc_rcu(in_dev, pmc) {
|
|
spin_lock_bh(&pmc->lock);
|
|
if (pmc->sfcount[MCAST_EXCLUDE]) {
|
|
type = IGMPV3_BLOCK_OLD_SOURCES;
|
|
dtype = IGMPV3_ALLOW_NEW_SOURCES;
|
|
} else {
|
|
type = IGMPV3_ALLOW_NEW_SOURCES;
|
|
dtype = IGMPV3_BLOCK_OLD_SOURCES;
|
|
}
|
|
skb = add_grec(skb, pmc, type, 0, 0);
|
|
skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
|
|
|
|
/* filter mode changes */
|
|
if (pmc->crcount) {
|
|
if (pmc->sfmode == MCAST_EXCLUDE)
|
|
type = IGMPV3_CHANGE_TO_EXCLUDE;
|
|
else
|
|
type = IGMPV3_CHANGE_TO_INCLUDE;
|
|
skb = add_grec(skb, pmc, type, 0, 0);
|
|
pmc->crcount--;
|
|
}
|
|
spin_unlock_bh(&pmc->lock);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (!skb)
|
|
return;
|
|
(void) igmpv3_sendpack(skb);
|
|
}
|
|
|
|
static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
|
|
int type)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct iphdr *iph;
|
|
struct igmphdr *ih;
|
|
struct rtable *rt;
|
|
struct net_device *dev = in_dev->dev;
|
|
struct net *net = dev_net(dev);
|
|
__be32 group = pmc ? pmc->multiaddr : 0;
|
|
struct flowi4 fl4;
|
|
__be32 dst;
|
|
int hlen, tlen;
|
|
|
|
if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
|
|
return igmpv3_send_report(in_dev, pmc);
|
|
|
|
if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
|
|
return 0;
|
|
|
|
if (type == IGMP_HOST_LEAVE_MESSAGE)
|
|
dst = IGMP_ALL_ROUTER;
|
|
else
|
|
dst = group;
|
|
|
|
rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
|
|
0, 0,
|
|
IPPROTO_IGMP, 0, dev->ifindex);
|
|
if (IS_ERR(rt))
|
|
return -1;
|
|
|
|
hlen = LL_RESERVED_SPACE(dev);
|
|
tlen = dev->needed_tailroom;
|
|
skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
|
|
if (!skb) {
|
|
ip_rt_put(rt);
|
|
return -1;
|
|
}
|
|
skb->priority = TC_PRIO_CONTROL;
|
|
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
skb_reserve(skb, hlen);
|
|
|
|
skb_reset_network_header(skb);
|
|
iph = ip_hdr(skb);
|
|
skb_put(skb, sizeof(struct iphdr) + 4);
|
|
|
|
iph->version = 4;
|
|
iph->ihl = (sizeof(struct iphdr)+4)>>2;
|
|
iph->tos = 0xc0;
|
|
iph->frag_off = htons(IP_DF);
|
|
iph->ttl = 1;
|
|
iph->daddr = dst;
|
|
iph->saddr = fl4.saddr;
|
|
iph->protocol = IPPROTO_IGMP;
|
|
ip_select_ident(net, skb, NULL);
|
|
((u8 *)&iph[1])[0] = IPOPT_RA;
|
|
((u8 *)&iph[1])[1] = 4;
|
|
((u8 *)&iph[1])[2] = 0;
|
|
((u8 *)&iph[1])[3] = 0;
|
|
|
|
ih = skb_put(skb, sizeof(struct igmphdr));
|
|
ih->type = type;
|
|
ih->code = 0;
|
|
ih->csum = 0;
|
|
ih->group = group;
|
|
ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
|
|
|
|
return ip_local_out(net, skb->sk, skb);
|
|
}
|
|
|
|
static void igmp_gq_timer_expire(struct timer_list *t)
|
|
{
|
|
struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer);
|
|
|
|
in_dev->mr_gq_running = 0;
|
|
igmpv3_send_report(in_dev, NULL);
|
|
in_dev_put(in_dev);
|
|
}
|
|
|
|
static void igmp_ifc_timer_expire(struct timer_list *t)
|
|
{
|
|
struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
|
|
|
|
igmpv3_send_cr(in_dev);
|
|
if (in_dev->mr_ifc_count) {
|
|
in_dev->mr_ifc_count--;
|
|
igmp_ifc_start_timer(in_dev,
|
|
unsolicited_report_interval(in_dev));
|
|
}
|
|
in_dev_put(in_dev);
|
|
}
|
|
|
|
static void igmp_ifc_event(struct in_device *in_dev)
|
|
{
|
|
struct net *net = dev_net(in_dev->dev);
|
|
if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
|
|
return;
|
|
in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
igmp_ifc_start_timer(in_dev, 1);
|
|
}
|
|
|
|
|
|
static void igmp_timer_expire(struct timer_list *t)
|
|
{
|
|
struct ip_mc_list *im = from_timer(im, t, timer);
|
|
struct in_device *in_dev = im->interface;
|
|
|
|
spin_lock(&im->lock);
|
|
im->tm_running = 0;
|
|
|
|
if (im->unsolicit_count && --im->unsolicit_count)
|
|
igmp_start_timer(im, unsolicited_report_interval(in_dev));
|
|
|
|
im->reporter = 1;
|
|
spin_unlock(&im->lock);
|
|
|
|
if (IGMP_V1_SEEN(in_dev))
|
|
igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
|
|
else if (IGMP_V2_SEEN(in_dev))
|
|
igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
|
|
else
|
|
igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
|
|
|
|
ip_ma_put(im);
|
|
}
|
|
|
|
/* mark EXCLUDE-mode sources */
|
|
static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
|
|
{
|
|
struct ip_sf_list *psf;
|
|
int i, scount;
|
|
|
|
scount = 0;
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next) {
|
|
if (scount == nsrcs)
|
|
break;
|
|
for (i = 0; i < nsrcs; i++) {
|
|
/* skip inactive filters */
|
|
if (psf->sf_count[MCAST_INCLUDE] ||
|
|
pmc->sfcount[MCAST_EXCLUDE] !=
|
|
psf->sf_count[MCAST_EXCLUDE])
|
|
break;
|
|
if (srcs[i] == psf->sf_inaddr) {
|
|
scount++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
pmc->gsquery = 0;
|
|
if (scount == nsrcs) /* all sources excluded */
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
|
|
{
|
|
struct ip_sf_list *psf;
|
|
int i, scount;
|
|
|
|
if (pmc->sfmode == MCAST_EXCLUDE)
|
|
return igmp_xmarksources(pmc, nsrcs, srcs);
|
|
|
|
/* mark INCLUDE-mode sources */
|
|
scount = 0;
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next) {
|
|
if (scount == nsrcs)
|
|
break;
|
|
for (i = 0; i < nsrcs; i++)
|
|
if (srcs[i] == psf->sf_inaddr) {
|
|
psf->sf_gsresp = 1;
|
|
scount++;
|
|
break;
|
|
}
|
|
}
|
|
if (!scount) {
|
|
pmc->gsquery = 0;
|
|
return 0;
|
|
}
|
|
pmc->gsquery = 1;
|
|
return 1;
|
|
}
|
|
|
|
/* return true if packet was dropped */
|
|
static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
|
|
{
|
|
struct ip_mc_list *im;
|
|
struct net *net = dev_net(in_dev->dev);
|
|
|
|
/* Timers are only set for non-local groups */
|
|
|
|
if (group == IGMP_ALL_HOSTS)
|
|
return false;
|
|
if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
|
|
return false;
|
|
|
|
rcu_read_lock();
|
|
for_each_pmc_rcu(in_dev, im) {
|
|
if (im->multiaddr == group) {
|
|
igmp_stop_timer(im);
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return false;
|
|
}
|
|
|
|
/* return true if packet was dropped */
|
|
static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
|
|
int len)
|
|
{
|
|
struct igmphdr *ih = igmp_hdr(skb);
|
|
struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
|
|
struct ip_mc_list *im;
|
|
__be32 group = ih->group;
|
|
int max_delay;
|
|
int mark = 0;
|
|
struct net *net = dev_net(in_dev->dev);
|
|
|
|
|
|
if (len == 8) {
|
|
if (ih->code == 0) {
|
|
/* Alas, old v1 router presents here. */
|
|
|
|
max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
|
|
in_dev->mr_v1_seen = jiffies +
|
|
(in_dev->mr_qrv * in_dev->mr_qi) +
|
|
in_dev->mr_qri;
|
|
group = 0;
|
|
} else {
|
|
/* v2 router present */
|
|
max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
|
|
in_dev->mr_v2_seen = jiffies +
|
|
(in_dev->mr_qrv * in_dev->mr_qi) +
|
|
in_dev->mr_qri;
|
|
}
|
|
/* cancel the interface change timer */
|
|
in_dev->mr_ifc_count = 0;
|
|
if (del_timer(&in_dev->mr_ifc_timer))
|
|
__in_dev_put(in_dev);
|
|
/* clear deleted report items */
|
|
igmpv3_clear_delrec(in_dev);
|
|
} else if (len < 12) {
|
|
return true; /* ignore bogus packet; freed by caller */
|
|
} else if (IGMP_V1_SEEN(in_dev)) {
|
|
/* This is a v3 query with v1 queriers present */
|
|
max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
|
|
group = 0;
|
|
} else if (IGMP_V2_SEEN(in_dev)) {
|
|
/* this is a v3 query with v2 queriers present;
|
|
* Interpretation of the max_delay code is problematic here.
|
|
* A real v2 host would use ih_code directly, while v3 has a
|
|
* different encoding. We use the v3 encoding as more likely
|
|
* to be intended in a v3 query.
|
|
*/
|
|
max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
|
|
if (!max_delay)
|
|
max_delay = 1; /* can't mod w/ 0 */
|
|
} else { /* v3 */
|
|
if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
|
|
return true;
|
|
|
|
ih3 = igmpv3_query_hdr(skb);
|
|
if (ih3->nsrcs) {
|
|
if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
|
|
+ ntohs(ih3->nsrcs)*sizeof(__be32)))
|
|
return true;
|
|
ih3 = igmpv3_query_hdr(skb);
|
|
}
|
|
|
|
max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
|
|
if (!max_delay)
|
|
max_delay = 1; /* can't mod w/ 0 */
|
|
in_dev->mr_maxdelay = max_delay;
|
|
|
|
/* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently
|
|
* received value was zero, use the default or statically
|
|
* configured value.
|
|
*/
|
|
in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL;
|
|
|
|
/* RFC3376, 8.3. Query Response Interval:
|
|
* The number of seconds represented by the [Query Response
|
|
* Interval] must be less than the [Query Interval].
|
|
*/
|
|
if (in_dev->mr_qri >= in_dev->mr_qi)
|
|
in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ;
|
|
|
|
if (!group) { /* general query */
|
|
if (ih3->nsrcs)
|
|
return true; /* no sources allowed */
|
|
igmp_gq_start_timer(in_dev);
|
|
return false;
|
|
}
|
|
/* mark sources to include, if group & source-specific */
|
|
mark = ih3->nsrcs != 0;
|
|
}
|
|
|
|
/*
|
|
* - Start the timers in all of our membership records
|
|
* that the query applies to for the interface on
|
|
* which the query arrived excl. those that belong
|
|
* to a "local" group (224.0.0.X)
|
|
* - For timers already running check if they need to
|
|
* be reset.
|
|
* - Use the igmp->igmp_code field as the maximum
|
|
* delay possible
|
|
*/
|
|
rcu_read_lock();
|
|
for_each_pmc_rcu(in_dev, im) {
|
|
int changed;
|
|
|
|
if (group && group != im->multiaddr)
|
|
continue;
|
|
if (im->multiaddr == IGMP_ALL_HOSTS)
|
|
continue;
|
|
if (ipv4_is_local_multicast(im->multiaddr) &&
|
|
!net->ipv4.sysctl_igmp_llm_reports)
|
|
continue;
|
|
spin_lock_bh(&im->lock);
|
|
if (im->tm_running)
|
|
im->gsquery = im->gsquery && mark;
|
|
else
|
|
im->gsquery = mark;
|
|
changed = !im->gsquery ||
|
|
igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
|
|
spin_unlock_bh(&im->lock);
|
|
if (changed)
|
|
igmp_mod_timer(im, max_delay);
|
|
}
|
|
rcu_read_unlock();
|
|
return false;
|
|
}
|
|
|
|
/* called in rcu_read_lock() section */
|
|
int igmp_rcv(struct sk_buff *skb)
|
|
{
|
|
/* This basically follows the spec line by line -- see RFC1112 */
|
|
struct igmphdr *ih;
|
|
struct net_device *dev = skb->dev;
|
|
struct in_device *in_dev;
|
|
int len = skb->len;
|
|
bool dropped = true;
|
|
|
|
if (netif_is_l3_master(dev)) {
|
|
dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
|
|
if (!dev)
|
|
goto drop;
|
|
}
|
|
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
|
|
goto drop;
|
|
|
|
if (skb_checksum_simple_validate(skb))
|
|
goto drop;
|
|
|
|
ih = igmp_hdr(skb);
|
|
switch (ih->type) {
|
|
case IGMP_HOST_MEMBERSHIP_QUERY:
|
|
dropped = igmp_heard_query(in_dev, skb, len);
|
|
break;
|
|
case IGMP_HOST_MEMBERSHIP_REPORT:
|
|
case IGMPV2_HOST_MEMBERSHIP_REPORT:
|
|
/* Is it our report looped back? */
|
|
if (rt_is_output_route(skb_rtable(skb)))
|
|
break;
|
|
/* don't rely on MC router hearing unicast reports */
|
|
if (skb->pkt_type == PACKET_MULTICAST ||
|
|
skb->pkt_type == PACKET_BROADCAST)
|
|
dropped = igmp_heard_report(in_dev, ih->group);
|
|
break;
|
|
case IGMP_PIM:
|
|
#ifdef CONFIG_IP_PIMSM_V1
|
|
return pim_rcv_v1(skb);
|
|
#endif
|
|
case IGMPV3_HOST_MEMBERSHIP_REPORT:
|
|
case IGMP_DVMRP:
|
|
case IGMP_TRACE:
|
|
case IGMP_HOST_LEAVE_MESSAGE:
|
|
case IGMP_MTRACE:
|
|
case IGMP_MTRACE_RESP:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
drop:
|
|
if (dropped)
|
|
kfree_skb(skb);
|
|
else
|
|
consume_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Add a filter to a device
|
|
*/
|
|
|
|
static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
|
|
{
|
|
char buf[MAX_ADDR_LEN];
|
|
struct net_device *dev = in_dev->dev;
|
|
|
|
/* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
|
|
We will get multicast token leakage, when IFF_MULTICAST
|
|
is changed. This check should be done in ndo_set_rx_mode
|
|
routine. Something sort of:
|
|
if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
|
|
--ANK
|
|
*/
|
|
if (arp_mc_map(addr, buf, dev, 0) == 0)
|
|
dev_mc_add(dev, buf);
|
|
}
|
|
|
|
/*
|
|
* Remove a filter from a device
|
|
*/
|
|
|
|
static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
|
|
{
|
|
char buf[MAX_ADDR_LEN];
|
|
struct net_device *dev = in_dev->dev;
|
|
|
|
if (arp_mc_map(addr, buf, dev, 0) == 0)
|
|
dev_mc_del(dev, buf);
|
|
}
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
/*
|
|
* deleted ip_mc_list manipulation
|
|
*/
|
|
static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
|
|
gfp_t gfp)
|
|
{
|
|
struct ip_mc_list *pmc;
|
|
struct net *net = dev_net(in_dev->dev);
|
|
|
|
/* this is an "ip_mc_list" for convenience; only the fields below
|
|
* are actually used. In particular, the refcnt and users are not
|
|
* used for management of the delete list. Using the same structure
|
|
* for deleted items allows change reports to use common code with
|
|
* non-deleted or query-response MCA's.
|
|
*/
|
|
pmc = kzalloc(sizeof(*pmc), gfp);
|
|
if (!pmc)
|
|
return;
|
|
spin_lock_init(&pmc->lock);
|
|
spin_lock_bh(&im->lock);
|
|
pmc->interface = im->interface;
|
|
in_dev_hold(in_dev);
|
|
pmc->multiaddr = im->multiaddr;
|
|
pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
pmc->sfmode = im->sfmode;
|
|
if (pmc->sfmode == MCAST_INCLUDE) {
|
|
struct ip_sf_list *psf;
|
|
|
|
pmc->tomb = im->tomb;
|
|
pmc->sources = im->sources;
|
|
im->tomb = im->sources = NULL;
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next)
|
|
psf->sf_crcount = pmc->crcount;
|
|
}
|
|
spin_unlock_bh(&im->lock);
|
|
|
|
spin_lock_bh(&in_dev->mc_tomb_lock);
|
|
pmc->next = in_dev->mc_tomb;
|
|
in_dev->mc_tomb = pmc;
|
|
spin_unlock_bh(&in_dev->mc_tomb_lock);
|
|
}
|
|
|
|
/*
|
|
* restore ip_mc_list deleted records
|
|
*/
|
|
static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
|
|
{
|
|
struct ip_mc_list *pmc, *pmc_prev;
|
|
struct ip_sf_list *psf;
|
|
struct net *net = dev_net(in_dev->dev);
|
|
__be32 multiaddr = im->multiaddr;
|
|
|
|
spin_lock_bh(&in_dev->mc_tomb_lock);
|
|
pmc_prev = NULL;
|
|
for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
|
|
if (pmc->multiaddr == multiaddr)
|
|
break;
|
|
pmc_prev = pmc;
|
|
}
|
|
if (pmc) {
|
|
if (pmc_prev)
|
|
pmc_prev->next = pmc->next;
|
|
else
|
|
in_dev->mc_tomb = pmc->next;
|
|
}
|
|
spin_unlock_bh(&in_dev->mc_tomb_lock);
|
|
|
|
spin_lock_bh(&im->lock);
|
|
if (pmc) {
|
|
im->interface = pmc->interface;
|
|
if (im->sfmode == MCAST_INCLUDE) {
|
|
swap(im->tomb, pmc->tomb);
|
|
swap(im->sources, pmc->sources);
|
|
for (psf = im->sources; psf; psf = psf->sf_next)
|
|
psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
} else {
|
|
im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
}
|
|
in_dev_put(pmc->interface);
|
|
kfree_pmc(pmc);
|
|
}
|
|
spin_unlock_bh(&im->lock);
|
|
}
|
|
|
|
/*
|
|
* flush ip_mc_list deleted records
|
|
*/
|
|
static void igmpv3_clear_delrec(struct in_device *in_dev)
|
|
{
|
|
struct ip_mc_list *pmc, *nextpmc;
|
|
|
|
spin_lock_bh(&in_dev->mc_tomb_lock);
|
|
pmc = in_dev->mc_tomb;
|
|
in_dev->mc_tomb = NULL;
|
|
spin_unlock_bh(&in_dev->mc_tomb_lock);
|
|
|
|
for (; pmc; pmc = nextpmc) {
|
|
nextpmc = pmc->next;
|
|
ip_mc_clear_src(pmc);
|
|
in_dev_put(pmc->interface);
|
|
kfree_pmc(pmc);
|
|
}
|
|
/* clear dead sources, too */
|
|
rcu_read_lock();
|
|
for_each_pmc_rcu(in_dev, pmc) {
|
|
struct ip_sf_list *psf;
|
|
|
|
spin_lock_bh(&pmc->lock);
|
|
psf = pmc->tomb;
|
|
pmc->tomb = NULL;
|
|
spin_unlock_bh(&pmc->lock);
|
|
ip_sf_list_clear_all(psf);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
#endif
|
|
|
|
static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp)
|
|
{
|
|
struct in_device *in_dev = im->interface;
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
struct net *net = dev_net(in_dev->dev);
|
|
int reporter;
|
|
#endif
|
|
|
|
if (im->loaded) {
|
|
im->loaded = 0;
|
|
ip_mc_filter_del(in_dev, im->multiaddr);
|
|
}
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
if (im->multiaddr == IGMP_ALL_HOSTS)
|
|
return;
|
|
if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
|
|
return;
|
|
|
|
reporter = im->reporter;
|
|
igmp_stop_timer(im);
|
|
|
|
if (!in_dev->dead) {
|
|
if (IGMP_V1_SEEN(in_dev))
|
|
return;
|
|
if (IGMP_V2_SEEN(in_dev)) {
|
|
if (reporter)
|
|
igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
|
|
return;
|
|
}
|
|
/* IGMPv3 */
|
|
igmpv3_add_delrec(in_dev, im, gfp);
|
|
|
|
igmp_ifc_event(in_dev);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void igmp_group_dropped(struct ip_mc_list *im)
|
|
{
|
|
__igmp_group_dropped(im, GFP_KERNEL);
|
|
}
|
|
|
|
static void igmp_group_added(struct ip_mc_list *im)
|
|
{
|
|
struct in_device *in_dev = im->interface;
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
struct net *net = dev_net(in_dev->dev);
|
|
#endif
|
|
|
|
if (im->loaded == 0) {
|
|
im->loaded = 1;
|
|
ip_mc_filter_add(in_dev, im->multiaddr);
|
|
}
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
if (im->multiaddr == IGMP_ALL_HOSTS)
|
|
return;
|
|
if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
|
|
return;
|
|
|
|
if (in_dev->dead)
|
|
return;
|
|
|
|
im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
|
|
if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
|
|
spin_lock_bh(&im->lock);
|
|
igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
|
|
spin_unlock_bh(&im->lock);
|
|
return;
|
|
}
|
|
/* else, v3 */
|
|
|
|
/* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should
|
|
* not send filter-mode change record as the mode should be from
|
|
* IN() to IN(A).
|
|
*/
|
|
if (im->sfmode == MCAST_EXCLUDE)
|
|
im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
|
|
igmp_ifc_event(in_dev);
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Multicast list managers
|
|
*/
|
|
|
|
static u32 ip_mc_hash(const struct ip_mc_list *im)
|
|
{
|
|
return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
|
|
}
|
|
|
|
static void ip_mc_hash_add(struct in_device *in_dev,
|
|
struct ip_mc_list *im)
|
|
{
|
|
struct ip_mc_list __rcu **mc_hash;
|
|
u32 hash;
|
|
|
|
mc_hash = rtnl_dereference(in_dev->mc_hash);
|
|
if (mc_hash) {
|
|
hash = ip_mc_hash(im);
|
|
im->next_hash = mc_hash[hash];
|
|
rcu_assign_pointer(mc_hash[hash], im);
|
|
return;
|
|
}
|
|
|
|
/* do not use a hash table for small number of items */
|
|
if (in_dev->mc_count < 4)
|
|
return;
|
|
|
|
mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
|
|
GFP_KERNEL);
|
|
if (!mc_hash)
|
|
return;
|
|
|
|
for_each_pmc_rtnl(in_dev, im) {
|
|
hash = ip_mc_hash(im);
|
|
im->next_hash = mc_hash[hash];
|
|
RCU_INIT_POINTER(mc_hash[hash], im);
|
|
}
|
|
|
|
rcu_assign_pointer(in_dev->mc_hash, mc_hash);
|
|
}
|
|
|
|
static void ip_mc_hash_remove(struct in_device *in_dev,
|
|
struct ip_mc_list *im)
|
|
{
|
|
struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
|
|
struct ip_mc_list *aux;
|
|
|
|
if (!mc_hash)
|
|
return;
|
|
mc_hash += ip_mc_hash(im);
|
|
while ((aux = rtnl_dereference(*mc_hash)) != im)
|
|
mc_hash = &aux->next_hash;
|
|
*mc_hash = im->next_hash;
|
|
}
|
|
|
|
|
|
/*
|
|
* A socket has joined a multicast group on device dev.
|
|
*/
|
|
static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
|
|
unsigned int mode, gfp_t gfp)
|
|
{
|
|
struct ip_mc_list *im;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for_each_pmc_rtnl(in_dev, im) {
|
|
if (im->multiaddr == addr) {
|
|
im->users++;
|
|
ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
im = kzalloc(sizeof(*im), gfp);
|
|
if (!im)
|
|
goto out;
|
|
|
|
im->users = 1;
|
|
im->interface = in_dev;
|
|
in_dev_hold(in_dev);
|
|
im->multiaddr = addr;
|
|
/* initial mode is (EX, empty) */
|
|
im->sfmode = mode;
|
|
im->sfcount[mode] = 1;
|
|
refcount_set(&im->refcnt, 1);
|
|
spin_lock_init(&im->lock);
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
timer_setup(&im->timer, igmp_timer_expire, 0);
|
|
#endif
|
|
|
|
im->next_rcu = in_dev->mc_list;
|
|
in_dev->mc_count++;
|
|
rcu_assign_pointer(in_dev->mc_list, im);
|
|
|
|
ip_mc_hash_add(in_dev, im);
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
igmpv3_del_delrec(in_dev, im);
|
|
#endif
|
|
igmp_group_added(im);
|
|
if (!in_dev->dead)
|
|
ip_rt_multicast_event(in_dev);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
|
|
{
|
|
____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp);
|
|
}
|
|
EXPORT_SYMBOL(__ip_mc_inc_group);
|
|
|
|
void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
|
|
{
|
|
__ip_mc_inc_group(in_dev, addr, GFP_KERNEL);
|
|
}
|
|
EXPORT_SYMBOL(ip_mc_inc_group);
|
|
|
|
static int ip_mc_check_iphdr(struct sk_buff *skb)
|
|
{
|
|
const struct iphdr *iph;
|
|
unsigned int len;
|
|
unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
|
|
|
|
if (!pskb_may_pull(skb, offset))
|
|
return -EINVAL;
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
|
|
return -EINVAL;
|
|
|
|
offset += ip_hdrlen(skb) - sizeof(*iph);
|
|
|
|
if (!pskb_may_pull(skb, offset))
|
|
return -EINVAL;
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
|
|
return -EINVAL;
|
|
|
|
len = skb_network_offset(skb) + ntohs(iph->tot_len);
|
|
if (skb->len < len || len < offset)
|
|
return -EINVAL;
|
|
|
|
skb_set_transport_header(skb, offset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
|
|
{
|
|
unsigned int len = skb_transport_offset(skb);
|
|
|
|
len += sizeof(struct igmpv3_report);
|
|
|
|
return ip_mc_may_pull(skb, len) ? 0 : -EINVAL;
|
|
}
|
|
|
|
static int ip_mc_check_igmp_query(struct sk_buff *skb)
|
|
{
|
|
unsigned int transport_len = ip_transport_len(skb);
|
|
unsigned int len;
|
|
|
|
/* IGMPv{1,2}? */
|
|
if (transport_len != sizeof(struct igmphdr)) {
|
|
/* or IGMPv3? */
|
|
if (transport_len < sizeof(struct igmpv3_query))
|
|
return -EINVAL;
|
|
|
|
len = skb_transport_offset(skb) + sizeof(struct igmpv3_query);
|
|
if (!ip_mc_may_pull(skb, len))
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
|
|
* all-systems destination addresses (224.0.0.1) for general queries
|
|
*/
|
|
if (!igmp_hdr(skb)->group &&
|
|
ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip_mc_check_igmp_msg(struct sk_buff *skb)
|
|
{
|
|
switch (igmp_hdr(skb)->type) {
|
|
case IGMP_HOST_LEAVE_MESSAGE:
|
|
case IGMP_HOST_MEMBERSHIP_REPORT:
|
|
case IGMPV2_HOST_MEMBERSHIP_REPORT:
|
|
return 0;
|
|
case IGMPV3_HOST_MEMBERSHIP_REPORT:
|
|
return ip_mc_check_igmp_reportv3(skb);
|
|
case IGMP_HOST_MEMBERSHIP_QUERY:
|
|
return ip_mc_check_igmp_query(skb);
|
|
default:
|
|
return -ENOMSG;
|
|
}
|
|
}
|
|
|
|
static __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
|
|
{
|
|
return skb_checksum_simple_validate(skb);
|
|
}
|
|
|
|
static int ip_mc_check_igmp_csum(struct sk_buff *skb)
|
|
{
|
|
unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
|
|
unsigned int transport_len = ip_transport_len(skb);
|
|
struct sk_buff *skb_chk;
|
|
|
|
if (!ip_mc_may_pull(skb, len))
|
|
return -EINVAL;
|
|
|
|
skb_chk = skb_checksum_trimmed(skb, transport_len,
|
|
ip_mc_validate_checksum);
|
|
if (!skb_chk)
|
|
return -EINVAL;
|
|
|
|
if (skb_chk != skb)
|
|
kfree_skb(skb_chk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ip_mc_check_igmp - checks whether this is a sane IGMP packet
|
|
* @skb: the skb to validate
|
|
*
|
|
* Checks whether an IPv4 packet is a valid IGMP packet. If so sets
|
|
* skb transport header accordingly and returns zero.
|
|
*
|
|
* -EINVAL: A broken packet was detected, i.e. it violates some internet
|
|
* standard
|
|
* -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
|
|
* -ENOMEM: A memory allocation failure happened.
|
|
*
|
|
* Caller needs to set the skb network header and free any returned skb if it
|
|
* differs from the provided skb.
|
|
*/
|
|
int ip_mc_check_igmp(struct sk_buff *skb)
|
|
{
|
|
int ret = ip_mc_check_iphdr(skb);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
|
|
return -ENOMSG;
|
|
|
|
ret = ip_mc_check_igmp_csum(skb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return ip_mc_check_igmp_msg(skb);
|
|
}
|
|
EXPORT_SYMBOL(ip_mc_check_igmp);
|
|
|
|
/*
|
|
* Resend IGMP JOIN report; used by netdev notifier.
|
|
*/
|
|
static void ip_mc_rejoin_groups(struct in_device *in_dev)
|
|
{
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
struct ip_mc_list *im;
|
|
int type;
|
|
struct net *net = dev_net(in_dev->dev);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for_each_pmc_rtnl(in_dev, im) {
|
|
if (im->multiaddr == IGMP_ALL_HOSTS)
|
|
continue;
|
|
if (ipv4_is_local_multicast(im->multiaddr) &&
|
|
!net->ipv4.sysctl_igmp_llm_reports)
|
|
continue;
|
|
|
|
/* a failover is happening and switches
|
|
* must be notified immediately
|
|
*/
|
|
if (IGMP_V1_SEEN(in_dev))
|
|
type = IGMP_HOST_MEMBERSHIP_REPORT;
|
|
else if (IGMP_V2_SEEN(in_dev))
|
|
type = IGMPV2_HOST_MEMBERSHIP_REPORT;
|
|
else
|
|
type = IGMPV3_HOST_MEMBERSHIP_REPORT;
|
|
igmp_send_report(in_dev, im, type);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* A socket has left a multicast group on device dev
|
|
*/
|
|
|
|
void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
|
|
{
|
|
struct ip_mc_list *i;
|
|
struct ip_mc_list __rcu **ip;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for (ip = &in_dev->mc_list;
|
|
(i = rtnl_dereference(*ip)) != NULL;
|
|
ip = &i->next_rcu) {
|
|
if (i->multiaddr == addr) {
|
|
if (--i->users == 0) {
|
|
ip_mc_hash_remove(in_dev, i);
|
|
*ip = i->next_rcu;
|
|
in_dev->mc_count--;
|
|
__igmp_group_dropped(i, gfp);
|
|
ip_mc_clear_src(i);
|
|
|
|
if (!in_dev->dead)
|
|
ip_rt_multicast_event(in_dev);
|
|
|
|
ip_ma_put(i);
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(__ip_mc_dec_group);
|
|
|
|
/* Device changing type */
|
|
|
|
void ip_mc_unmap(struct in_device *in_dev)
|
|
{
|
|
struct ip_mc_list *pmc;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for_each_pmc_rtnl(in_dev, pmc)
|
|
igmp_group_dropped(pmc);
|
|
}
|
|
|
|
void ip_mc_remap(struct in_device *in_dev)
|
|
{
|
|
struct ip_mc_list *pmc;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for_each_pmc_rtnl(in_dev, pmc) {
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
igmpv3_del_delrec(in_dev, pmc);
|
|
#endif
|
|
igmp_group_added(pmc);
|
|
}
|
|
}
|
|
|
|
/* Device going down */
|
|
|
|
void ip_mc_down(struct in_device *in_dev)
|
|
{
|
|
struct ip_mc_list *pmc;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for_each_pmc_rtnl(in_dev, pmc)
|
|
igmp_group_dropped(pmc);
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
in_dev->mr_ifc_count = 0;
|
|
if (del_timer(&in_dev->mr_ifc_timer))
|
|
__in_dev_put(in_dev);
|
|
in_dev->mr_gq_running = 0;
|
|
if (del_timer(&in_dev->mr_gq_timer))
|
|
__in_dev_put(in_dev);
|
|
#endif
|
|
|
|
ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
|
|
}
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
static void ip_mc_reset(struct in_device *in_dev)
|
|
{
|
|
struct net *net = dev_net(in_dev->dev);
|
|
|
|
in_dev->mr_qi = IGMP_QUERY_INTERVAL;
|
|
in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL;
|
|
in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
|
|
}
|
|
#else
|
|
static void ip_mc_reset(struct in_device *in_dev)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
void ip_mc_init_dev(struct in_device *in_dev)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
|
|
timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
|
|
#endif
|
|
ip_mc_reset(in_dev);
|
|
|
|
spin_lock_init(&in_dev->mc_tomb_lock);
|
|
}
|
|
|
|
/* Device going up */
|
|
|
|
void ip_mc_up(struct in_device *in_dev)
|
|
{
|
|
struct ip_mc_list *pmc;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
ip_mc_reset(in_dev);
|
|
ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
|
|
|
|
for_each_pmc_rtnl(in_dev, pmc) {
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
igmpv3_del_delrec(in_dev, pmc);
|
|
#endif
|
|
igmp_group_added(pmc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Device is about to be destroyed: clean up.
|
|
*/
|
|
|
|
void ip_mc_destroy_dev(struct in_device *in_dev)
|
|
{
|
|
struct ip_mc_list *i;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/* Deactivate timers */
|
|
ip_mc_down(in_dev);
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
igmpv3_clear_delrec(in_dev);
|
|
#endif
|
|
|
|
while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
|
|
in_dev->mc_list = i->next_rcu;
|
|
in_dev->mc_count--;
|
|
ip_ma_put(i);
|
|
}
|
|
}
|
|
|
|
/* RTNL is locked */
|
|
static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
|
|
{
|
|
struct net_device *dev = NULL;
|
|
struct in_device *idev = NULL;
|
|
|
|
if (imr->imr_ifindex) {
|
|
idev = inetdev_by_index(net, imr->imr_ifindex);
|
|
return idev;
|
|
}
|
|
if (imr->imr_address.s_addr) {
|
|
dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
|
|
if (!dev)
|
|
return NULL;
|
|
}
|
|
|
|
if (!dev) {
|
|
struct rtable *rt = ip_route_output(net,
|
|
imr->imr_multiaddr.s_addr,
|
|
0, 0, 0);
|
|
if (!IS_ERR(rt)) {
|
|
dev = rt->dst.dev;
|
|
ip_rt_put(rt);
|
|
}
|
|
}
|
|
if (dev) {
|
|
imr->imr_ifindex = dev->ifindex;
|
|
idev = __in_dev_get_rtnl(dev);
|
|
}
|
|
return idev;
|
|
}
|
|
|
|
/*
|
|
* Join a socket to a group
|
|
*/
|
|
|
|
static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
|
|
__be32 *psfsrc)
|
|
{
|
|
struct ip_sf_list *psf, *psf_prev;
|
|
int rv = 0;
|
|
|
|
psf_prev = NULL;
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next) {
|
|
if (psf->sf_inaddr == *psfsrc)
|
|
break;
|
|
psf_prev = psf;
|
|
}
|
|
if (!psf || psf->sf_count[sfmode] == 0) {
|
|
/* source filter not found, or count wrong => bug */
|
|
return -ESRCH;
|
|
}
|
|
psf->sf_count[sfmode]--;
|
|
if (psf->sf_count[sfmode] == 0) {
|
|
ip_rt_multicast_event(pmc->interface);
|
|
}
|
|
if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
struct in_device *in_dev = pmc->interface;
|
|
struct net *net = dev_net(in_dev->dev);
|
|
#endif
|
|
|
|
/* no more filters for this source */
|
|
if (psf_prev)
|
|
psf_prev->sf_next = psf->sf_next;
|
|
else
|
|
pmc->sources = psf->sf_next;
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
if (psf->sf_oldin &&
|
|
!IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
|
|
psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
psf->sf_next = pmc->tomb;
|
|
pmc->tomb = psf;
|
|
rv = 1;
|
|
} else
|
|
#endif
|
|
kfree(psf);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
#ifndef CONFIG_IP_MULTICAST
|
|
#define igmp_ifc_event(x) do { } while (0)
|
|
#endif
|
|
|
|
static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
|
|
int sfcount, __be32 *psfsrc, int delta)
|
|
{
|
|
struct ip_mc_list *pmc;
|
|
int changerec = 0;
|
|
int i, err;
|
|
|
|
if (!in_dev)
|
|
return -ENODEV;
|
|
rcu_read_lock();
|
|
for_each_pmc_rcu(in_dev, pmc) {
|
|
if (*pmca == pmc->multiaddr)
|
|
break;
|
|
}
|
|
if (!pmc) {
|
|
/* MCA not found?? bug */
|
|
rcu_read_unlock();
|
|
return -ESRCH;
|
|
}
|
|
spin_lock_bh(&pmc->lock);
|
|
rcu_read_unlock();
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
sf_markstate(pmc);
|
|
#endif
|
|
if (!delta) {
|
|
err = -EINVAL;
|
|
if (!pmc->sfcount[sfmode])
|
|
goto out_unlock;
|
|
pmc->sfcount[sfmode]--;
|
|
}
|
|
err = 0;
|
|
for (i = 0; i < sfcount; i++) {
|
|
int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
|
|
|
|
changerec |= rv > 0;
|
|
if (!err && rv < 0)
|
|
err = rv;
|
|
}
|
|
if (pmc->sfmode == MCAST_EXCLUDE &&
|
|
pmc->sfcount[MCAST_EXCLUDE] == 0 &&
|
|
pmc->sfcount[MCAST_INCLUDE]) {
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
struct ip_sf_list *psf;
|
|
struct net *net = dev_net(in_dev->dev);
|
|
#endif
|
|
|
|
/* filter mode change */
|
|
pmc->sfmode = MCAST_INCLUDE;
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
in_dev->mr_ifc_count = pmc->crcount;
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next)
|
|
psf->sf_crcount = 0;
|
|
igmp_ifc_event(pmc->interface);
|
|
} else if (sf_setstate(pmc) || changerec) {
|
|
igmp_ifc_event(pmc->interface);
|
|
#endif
|
|
}
|
|
out_unlock:
|
|
spin_unlock_bh(&pmc->lock);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Add multicast single-source filter to the interface list
|
|
*/
|
|
static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
|
|
__be32 *psfsrc)
|
|
{
|
|
struct ip_sf_list *psf, *psf_prev;
|
|
|
|
psf_prev = NULL;
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next) {
|
|
if (psf->sf_inaddr == *psfsrc)
|
|
break;
|
|
psf_prev = psf;
|
|
}
|
|
if (!psf) {
|
|
psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
|
|
if (!psf)
|
|
return -ENOBUFS;
|
|
psf->sf_inaddr = *psfsrc;
|
|
if (psf_prev) {
|
|
psf_prev->sf_next = psf;
|
|
} else
|
|
pmc->sources = psf;
|
|
}
|
|
psf->sf_count[sfmode]++;
|
|
if (psf->sf_count[sfmode] == 1) {
|
|
ip_rt_multicast_event(pmc->interface);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
static void sf_markstate(struct ip_mc_list *pmc)
|
|
{
|
|
struct ip_sf_list *psf;
|
|
int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
|
|
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next)
|
|
if (pmc->sfcount[MCAST_EXCLUDE]) {
|
|
psf->sf_oldin = mca_xcount ==
|
|
psf->sf_count[MCAST_EXCLUDE] &&
|
|
!psf->sf_count[MCAST_INCLUDE];
|
|
} else
|
|
psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
|
|
}
|
|
|
|
static int sf_setstate(struct ip_mc_list *pmc)
|
|
{
|
|
struct ip_sf_list *psf, *dpsf;
|
|
int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
|
|
int qrv = pmc->interface->mr_qrv;
|
|
int new_in, rv;
|
|
|
|
rv = 0;
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next) {
|
|
if (pmc->sfcount[MCAST_EXCLUDE]) {
|
|
new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
|
|
!psf->sf_count[MCAST_INCLUDE];
|
|
} else
|
|
new_in = psf->sf_count[MCAST_INCLUDE] != 0;
|
|
if (new_in) {
|
|
if (!psf->sf_oldin) {
|
|
struct ip_sf_list *prev = NULL;
|
|
|
|
for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
|
|
if (dpsf->sf_inaddr == psf->sf_inaddr)
|
|
break;
|
|
prev = dpsf;
|
|
}
|
|
if (dpsf) {
|
|
if (prev)
|
|
prev->sf_next = dpsf->sf_next;
|
|
else
|
|
pmc->tomb = dpsf->sf_next;
|
|
kfree(dpsf);
|
|
}
|
|
psf->sf_crcount = qrv;
|
|
rv++;
|
|
}
|
|
} else if (psf->sf_oldin) {
|
|
|
|
psf->sf_crcount = 0;
|
|
/*
|
|
* add or update "delete" records if an active filter
|
|
* is now inactive
|
|
*/
|
|
for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
|
|
if (dpsf->sf_inaddr == psf->sf_inaddr)
|
|
break;
|
|
if (!dpsf) {
|
|
dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
|
|
if (!dpsf)
|
|
continue;
|
|
*dpsf = *psf;
|
|
/* pmc->lock held by callers */
|
|
dpsf->sf_next = pmc->tomb;
|
|
pmc->tomb = dpsf;
|
|
}
|
|
dpsf->sf_crcount = qrv;
|
|
rv++;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Add multicast source filter list to the interface list
|
|
*/
|
|
static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
|
|
int sfcount, __be32 *psfsrc, int delta)
|
|
{
|
|
struct ip_mc_list *pmc;
|
|
int isexclude;
|
|
int i, err;
|
|
|
|
if (!in_dev)
|
|
return -ENODEV;
|
|
rcu_read_lock();
|
|
for_each_pmc_rcu(in_dev, pmc) {
|
|
if (*pmca == pmc->multiaddr)
|
|
break;
|
|
}
|
|
if (!pmc) {
|
|
/* MCA not found?? bug */
|
|
rcu_read_unlock();
|
|
return -ESRCH;
|
|
}
|
|
spin_lock_bh(&pmc->lock);
|
|
rcu_read_unlock();
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
sf_markstate(pmc);
|
|
#endif
|
|
isexclude = pmc->sfmode == MCAST_EXCLUDE;
|
|
if (!delta)
|
|
pmc->sfcount[sfmode]++;
|
|
err = 0;
|
|
for (i = 0; i < sfcount; i++) {
|
|
err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
|
|
if (err)
|
|
break;
|
|
}
|
|
if (err) {
|
|
int j;
|
|
|
|
if (!delta)
|
|
pmc->sfcount[sfmode]--;
|
|
for (j = 0; j < i; j++)
|
|
(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
|
|
} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
struct ip_sf_list *psf;
|
|
struct net *net = dev_net(pmc->interface->dev);
|
|
in_dev = pmc->interface;
|
|
#endif
|
|
|
|
/* filter mode change */
|
|
if (pmc->sfcount[MCAST_EXCLUDE])
|
|
pmc->sfmode = MCAST_EXCLUDE;
|
|
else if (pmc->sfcount[MCAST_INCLUDE])
|
|
pmc->sfmode = MCAST_INCLUDE;
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
/* else no filters; keep old mode for reports */
|
|
|
|
pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
|
|
in_dev->mr_ifc_count = pmc->crcount;
|
|
for (psf = pmc->sources; psf; psf = psf->sf_next)
|
|
psf->sf_crcount = 0;
|
|
igmp_ifc_event(in_dev);
|
|
} else if (sf_setstate(pmc)) {
|
|
igmp_ifc_event(in_dev);
|
|
#endif
|
|
}
|
|
spin_unlock_bh(&pmc->lock);
|
|
return err;
|
|
}
|
|
|
|
static void ip_mc_clear_src(struct ip_mc_list *pmc)
|
|
{
|
|
struct ip_sf_list *tomb, *sources;
|
|
|
|
spin_lock_bh(&pmc->lock);
|
|
tomb = pmc->tomb;
|
|
pmc->tomb = NULL;
|
|
sources = pmc->sources;
|
|
pmc->sources = NULL;
|
|
pmc->sfmode = MCAST_EXCLUDE;
|
|
pmc->sfcount[MCAST_INCLUDE] = 0;
|
|
pmc->sfcount[MCAST_EXCLUDE] = 1;
|
|
spin_unlock_bh(&pmc->lock);
|
|
|
|
ip_sf_list_clear_all(tomb);
|
|
ip_sf_list_clear_all(sources);
|
|
}
|
|
|
|
/* Join a multicast group
|
|
*/
|
|
static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
|
|
unsigned int mode)
|
|
{
|
|
__be32 addr = imr->imr_multiaddr.s_addr;
|
|
struct ip_mc_socklist *iml, *i;
|
|
struct in_device *in_dev;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct net *net = sock_net(sk);
|
|
int ifindex;
|
|
int count = 0;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!ipv4_is_multicast(addr))
|
|
return -EINVAL;
|
|
|
|
in_dev = ip_mc_find_dev(net, imr);
|
|
|
|
if (!in_dev) {
|
|
err = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
err = -EADDRINUSE;
|
|
ifindex = imr->imr_ifindex;
|
|
for_each_pmc_rtnl(inet, i) {
|
|
if (i->multi.imr_multiaddr.s_addr == addr &&
|
|
i->multi.imr_ifindex == ifindex)
|
|
goto done;
|
|
count++;
|
|
}
|
|
err = -ENOBUFS;
|
|
if (count >= net->ipv4.sysctl_igmp_max_memberships)
|
|
goto done;
|
|
iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
|
|
if (!iml)
|
|
goto done;
|
|
|
|
memcpy(&iml->multi, imr, sizeof(*imr));
|
|
iml->next_rcu = inet->mc_list;
|
|
iml->sflist = NULL;
|
|
iml->sfmode = mode;
|
|
rcu_assign_pointer(inet->mc_list, iml);
|
|
____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL);
|
|
err = 0;
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
/* Join ASM (Any-Source Multicast) group
|
|
*/
|
|
int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
|
|
{
|
|
return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE);
|
|
}
|
|
EXPORT_SYMBOL(ip_mc_join_group);
|
|
|
|
/* Join SSM (Source-Specific Multicast) group
|
|
*/
|
|
int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
|
|
unsigned int mode)
|
|
{
|
|
return __ip_mc_join_group(sk, imr, mode);
|
|
}
|
|
|
|
static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
|
|
struct in_device *in_dev)
|
|
{
|
|
struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
|
|
int err;
|
|
|
|
if (!psf) {
|
|
/* any-source empty exclude case */
|
|
return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
|
|
iml->sfmode, 0, NULL, 0);
|
|
}
|
|
err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
|
|
iml->sfmode, psf->sl_count, psf->sl_addr, 0);
|
|
RCU_INIT_POINTER(iml->sflist, NULL);
|
|
/* decrease mem now to avoid the memleak warning */
|
|
atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
|
|
kfree_rcu(psf, rcu);
|
|
return err;
|
|
}
|
|
|
|
int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_mc_socklist *iml;
|
|
struct ip_mc_socklist __rcu **imlp;
|
|
struct in_device *in_dev;
|
|
struct net *net = sock_net(sk);
|
|
__be32 group = imr->imr_multiaddr.s_addr;
|
|
u32 ifindex;
|
|
int ret = -EADDRNOTAVAIL;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
in_dev = ip_mc_find_dev(net, imr);
|
|
if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
ifindex = imr->imr_ifindex;
|
|
for (imlp = &inet->mc_list;
|
|
(iml = rtnl_dereference(*imlp)) != NULL;
|
|
imlp = &iml->next_rcu) {
|
|
if (iml->multi.imr_multiaddr.s_addr != group)
|
|
continue;
|
|
if (ifindex) {
|
|
if (iml->multi.imr_ifindex != ifindex)
|
|
continue;
|
|
} else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
|
|
iml->multi.imr_address.s_addr)
|
|
continue;
|
|
|
|
(void) ip_mc_leave_src(sk, iml, in_dev);
|
|
|
|
*imlp = iml->next_rcu;
|
|
|
|
if (in_dev)
|
|
ip_mc_dec_group(in_dev, group);
|
|
|
|
/* decrease mem now to avoid the memleak warning */
|
|
atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
|
|
kfree_rcu(iml, rcu);
|
|
return 0;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ip_mc_leave_group);
|
|
|
|
int ip_mc_source(int add, int omode, struct sock *sk, struct
|
|
ip_mreq_source *mreqs, int ifindex)
|
|
{
|
|
int err;
|
|
struct ip_mreqn imr;
|
|
__be32 addr = mreqs->imr_multiaddr;
|
|
struct ip_mc_socklist *pmc;
|
|
struct in_device *in_dev = NULL;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_sf_socklist *psl;
|
|
struct net *net = sock_net(sk);
|
|
int leavegroup = 0;
|
|
int i, j, rv;
|
|
|
|
if (!ipv4_is_multicast(addr))
|
|
return -EINVAL;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
|
|
imr.imr_address.s_addr = mreqs->imr_interface;
|
|
imr.imr_ifindex = ifindex;
|
|
in_dev = ip_mc_find_dev(net, &imr);
|
|
|
|
if (!in_dev) {
|
|
err = -ENODEV;
|
|
goto done;
|
|
}
|
|
err = -EADDRNOTAVAIL;
|
|
|
|
for_each_pmc_rtnl(inet, pmc) {
|
|
if ((pmc->multi.imr_multiaddr.s_addr ==
|
|
imr.imr_multiaddr.s_addr) &&
|
|
(pmc->multi.imr_ifindex == imr.imr_ifindex))
|
|
break;
|
|
}
|
|
if (!pmc) { /* must have a prior join */
|
|
err = -EINVAL;
|
|
goto done;
|
|
}
|
|
/* if a source filter was set, must be the same mode as before */
|
|
if (pmc->sflist) {
|
|
if (pmc->sfmode != omode) {
|
|
err = -EINVAL;
|
|
goto done;
|
|
}
|
|
} else if (pmc->sfmode != omode) {
|
|
/* allow mode switches for empty-set filters */
|
|
ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
|
|
ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
|
|
NULL, 0);
|
|
pmc->sfmode = omode;
|
|
}
|
|
|
|
psl = rtnl_dereference(pmc->sflist);
|
|
if (!add) {
|
|
if (!psl)
|
|
goto done; /* err = -EADDRNOTAVAIL */
|
|
rv = !0;
|
|
for (i = 0; i < psl->sl_count; i++) {
|
|
rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
|
|
sizeof(__be32));
|
|
if (rv == 0)
|
|
break;
|
|
}
|
|
if (rv) /* source not found */
|
|
goto done; /* err = -EADDRNOTAVAIL */
|
|
|
|
/* special case - (INCLUDE, empty) == LEAVE_GROUP */
|
|
if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
|
|
leavegroup = 1;
|
|
goto done;
|
|
}
|
|
|
|
/* update the interface filter */
|
|
ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
|
|
&mreqs->imr_sourceaddr, 1);
|
|
|
|
for (j = i+1; j < psl->sl_count; j++)
|
|
psl->sl_addr[j-1] = psl->sl_addr[j];
|
|
psl->sl_count--;
|
|
err = 0;
|
|
goto done;
|
|
}
|
|
/* else, add a new source to the filter */
|
|
|
|
if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
|
|
err = -ENOBUFS;
|
|
goto done;
|
|
}
|
|
if (!psl || psl->sl_count == psl->sl_max) {
|
|
struct ip_sf_socklist *newpsl;
|
|
int count = IP_SFBLOCK;
|
|
|
|
if (psl)
|
|
count += psl->sl_max;
|
|
newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
|
|
if (!newpsl) {
|
|
err = -ENOBUFS;
|
|
goto done;
|
|
}
|
|
newpsl->sl_max = count;
|
|
newpsl->sl_count = count - IP_SFBLOCK;
|
|
if (psl) {
|
|
for (i = 0; i < psl->sl_count; i++)
|
|
newpsl->sl_addr[i] = psl->sl_addr[i];
|
|
/* decrease mem now to avoid the memleak warning */
|
|
atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
|
|
kfree_rcu(psl, rcu);
|
|
}
|
|
rcu_assign_pointer(pmc->sflist, newpsl);
|
|
psl = newpsl;
|
|
}
|
|
rv = 1; /* > 0 for insert logic below if sl_count is 0 */
|
|
for (i = 0; i < psl->sl_count; i++) {
|
|
rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
|
|
sizeof(__be32));
|
|
if (rv == 0)
|
|
break;
|
|
}
|
|
if (rv == 0) /* address already there is an error */
|
|
goto done;
|
|
for (j = psl->sl_count-1; j >= i; j--)
|
|
psl->sl_addr[j+1] = psl->sl_addr[j];
|
|
psl->sl_addr[i] = mreqs->imr_sourceaddr;
|
|
psl->sl_count++;
|
|
err = 0;
|
|
/* update the interface list */
|
|
ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
|
|
&mreqs->imr_sourceaddr, 1);
|
|
done:
|
|
if (leavegroup)
|
|
err = ip_mc_leave_group(sk, &imr);
|
|
return err;
|
|
}
|
|
|
|
int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
|
|
{
|
|
int err = 0;
|
|
struct ip_mreqn imr;
|
|
__be32 addr = msf->imsf_multiaddr;
|
|
struct ip_mc_socklist *pmc;
|
|
struct in_device *in_dev;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_sf_socklist *newpsl, *psl;
|
|
struct net *net = sock_net(sk);
|
|
int leavegroup = 0;
|
|
|
|
if (!ipv4_is_multicast(addr))
|
|
return -EINVAL;
|
|
if (msf->imsf_fmode != MCAST_INCLUDE &&
|
|
msf->imsf_fmode != MCAST_EXCLUDE)
|
|
return -EINVAL;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
|
|
imr.imr_address.s_addr = msf->imsf_interface;
|
|
imr.imr_ifindex = ifindex;
|
|
in_dev = ip_mc_find_dev(net, &imr);
|
|
|
|
if (!in_dev) {
|
|
err = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
/* special case - (INCLUDE, empty) == LEAVE_GROUP */
|
|
if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
|
|
leavegroup = 1;
|
|
goto done;
|
|
}
|
|
|
|
for_each_pmc_rtnl(inet, pmc) {
|
|
if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
|
|
pmc->multi.imr_ifindex == imr.imr_ifindex)
|
|
break;
|
|
}
|
|
if (!pmc) { /* must have a prior join */
|
|
err = -EINVAL;
|
|
goto done;
|
|
}
|
|
if (msf->imsf_numsrc) {
|
|
newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
|
|
GFP_KERNEL);
|
|
if (!newpsl) {
|
|
err = -ENOBUFS;
|
|
goto done;
|
|
}
|
|
newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
|
|
memcpy(newpsl->sl_addr, msf->imsf_slist,
|
|
msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
|
|
err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
|
|
msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
|
|
if (err) {
|
|
sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
|
|
goto done;
|
|
}
|
|
} else {
|
|
newpsl = NULL;
|
|
(void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
|
|
msf->imsf_fmode, 0, NULL, 0);
|
|
}
|
|
psl = rtnl_dereference(pmc->sflist);
|
|
if (psl) {
|
|
(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
|
|
psl->sl_count, psl->sl_addr, 0);
|
|
/* decrease mem now to avoid the memleak warning */
|
|
atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
|
|
kfree_rcu(psl, rcu);
|
|
} else
|
|
(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
|
|
0, NULL, 0);
|
|
rcu_assign_pointer(pmc->sflist, newpsl);
|
|
pmc->sfmode = msf->imsf_fmode;
|
|
err = 0;
|
|
done:
|
|
if (leavegroup)
|
|
err = ip_mc_leave_group(sk, &imr);
|
|
return err;
|
|
}
|
|
|
|
int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
|
|
struct ip_msfilter __user *optval, int __user *optlen)
|
|
{
|
|
int err, len, count, copycount;
|
|
struct ip_mreqn imr;
|
|
__be32 addr = msf->imsf_multiaddr;
|
|
struct ip_mc_socklist *pmc;
|
|
struct in_device *in_dev;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_sf_socklist *psl;
|
|
struct net *net = sock_net(sk);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!ipv4_is_multicast(addr))
|
|
return -EINVAL;
|
|
|
|
imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
|
|
imr.imr_address.s_addr = msf->imsf_interface;
|
|
imr.imr_ifindex = 0;
|
|
in_dev = ip_mc_find_dev(net, &imr);
|
|
|
|
if (!in_dev) {
|
|
err = -ENODEV;
|
|
goto done;
|
|
}
|
|
err = -EADDRNOTAVAIL;
|
|
|
|
for_each_pmc_rtnl(inet, pmc) {
|
|
if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
|
|
pmc->multi.imr_ifindex == imr.imr_ifindex)
|
|
break;
|
|
}
|
|
if (!pmc) /* must have a prior join */
|
|
goto done;
|
|
msf->imsf_fmode = pmc->sfmode;
|
|
psl = rtnl_dereference(pmc->sflist);
|
|
if (!psl) {
|
|
len = 0;
|
|
count = 0;
|
|
} else {
|
|
count = psl->sl_count;
|
|
}
|
|
copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
|
|
len = copycount * sizeof(psl->sl_addr[0]);
|
|
msf->imsf_numsrc = count;
|
|
if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
|
|
copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
|
|
return -EFAULT;
|
|
}
|
|
if (len &&
|
|
copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
|
|
struct sockaddr_storage __user *p)
|
|
{
|
|
int i, count, copycount;
|
|
struct sockaddr_in *psin;
|
|
__be32 addr;
|
|
struct ip_mc_socklist *pmc;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_sf_socklist *psl;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
psin = (struct sockaddr_in *)&gsf->gf_group;
|
|
if (psin->sin_family != AF_INET)
|
|
return -EINVAL;
|
|
addr = psin->sin_addr.s_addr;
|
|
if (!ipv4_is_multicast(addr))
|
|
return -EINVAL;
|
|
|
|
for_each_pmc_rtnl(inet, pmc) {
|
|
if (pmc->multi.imr_multiaddr.s_addr == addr &&
|
|
pmc->multi.imr_ifindex == gsf->gf_interface)
|
|
break;
|
|
}
|
|
if (!pmc) /* must have a prior join */
|
|
return -EADDRNOTAVAIL;
|
|
gsf->gf_fmode = pmc->sfmode;
|
|
psl = rtnl_dereference(pmc->sflist);
|
|
count = psl ? psl->sl_count : 0;
|
|
copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
|
|
gsf->gf_numsrc = count;
|
|
for (i = 0; i < copycount; i++, p++) {
|
|
struct sockaddr_storage ss;
|
|
|
|
psin = (struct sockaddr_in *)&ss;
|
|
memset(&ss, 0, sizeof(ss));
|
|
psin->sin_family = AF_INET;
|
|
psin->sin_addr.s_addr = psl->sl_addr[i];
|
|
if (copy_to_user(p, &ss, sizeof(ss)))
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* check if a multicast source filter allows delivery for a given <src,dst,intf>
|
|
*/
|
|
int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
|
|
int dif, int sdif)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_mc_socklist *pmc;
|
|
struct ip_sf_socklist *psl;
|
|
int i;
|
|
int ret;
|
|
|
|
ret = 1;
|
|
if (!ipv4_is_multicast(loc_addr))
|
|
goto out;
|
|
|
|
rcu_read_lock();
|
|
for_each_pmc_rcu(inet, pmc) {
|
|
if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
|
|
(pmc->multi.imr_ifindex == dif ||
|
|
(sdif && pmc->multi.imr_ifindex == sdif)))
|
|
break;
|
|
}
|
|
ret = inet->mc_all;
|
|
if (!pmc)
|
|
goto unlock;
|
|
psl = rcu_dereference(pmc->sflist);
|
|
ret = (pmc->sfmode == MCAST_EXCLUDE);
|
|
if (!psl)
|
|
goto unlock;
|
|
|
|
for (i = 0; i < psl->sl_count; i++) {
|
|
if (psl->sl_addr[i] == rmt_addr)
|
|
break;
|
|
}
|
|
ret = 0;
|
|
if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
|
|
goto unlock;
|
|
if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
|
|
goto unlock;
|
|
ret = 1;
|
|
unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* A socket is closing.
|
|
*/
|
|
|
|
void ip_mc_drop_socket(struct sock *sk)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_mc_socklist *iml;
|
|
struct net *net = sock_net(sk);
|
|
|
|
if (!inet->mc_list)
|
|
return;
|
|
|
|
rtnl_lock();
|
|
while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
|
|
struct in_device *in_dev;
|
|
|
|
inet->mc_list = iml->next_rcu;
|
|
in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
|
|
(void) ip_mc_leave_src(sk, iml, in_dev);
|
|
if (in_dev)
|
|
ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
|
|
/* decrease mem now to avoid the memleak warning */
|
|
atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
|
|
kfree_rcu(iml, rcu);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
/* called with rcu_read_lock() */
|
|
int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
|
|
{
|
|
struct ip_mc_list *im;
|
|
struct ip_mc_list __rcu **mc_hash;
|
|
struct ip_sf_list *psf;
|
|
int rv = 0;
|
|
|
|
mc_hash = rcu_dereference(in_dev->mc_hash);
|
|
if (mc_hash) {
|
|
u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
|
|
|
|
for (im = rcu_dereference(mc_hash[hash]);
|
|
im != NULL;
|
|
im = rcu_dereference(im->next_hash)) {
|
|
if (im->multiaddr == mc_addr)
|
|
break;
|
|
}
|
|
} else {
|
|
for_each_pmc_rcu(in_dev, im) {
|
|
if (im->multiaddr == mc_addr)
|
|
break;
|
|
}
|
|
}
|
|
if (im && proto == IPPROTO_IGMP) {
|
|
rv = 1;
|
|
} else if (im) {
|
|
if (src_addr) {
|
|
for (psf = im->sources; psf; psf = psf->sf_next) {
|
|
if (psf->sf_inaddr == src_addr)
|
|
break;
|
|
}
|
|
if (psf)
|
|
rv = psf->sf_count[MCAST_INCLUDE] ||
|
|
psf->sf_count[MCAST_EXCLUDE] !=
|
|
im->sfcount[MCAST_EXCLUDE];
|
|
else
|
|
rv = im->sfcount[MCAST_EXCLUDE] != 0;
|
|
} else
|
|
rv = 1; /* unspecified source; tentatively allow */
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
#if defined(CONFIG_PROC_FS)
|
|
struct igmp_mc_iter_state {
|
|
struct seq_net_private p;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
};
|
|
|
|
#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
|
|
|
|
static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
struct ip_mc_list *im = NULL;
|
|
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
|
|
|
|
state->in_dev = NULL;
|
|
for_each_netdev_rcu(net, state->dev) {
|
|
struct in_device *in_dev;
|
|
|
|
in_dev = __in_dev_get_rcu(state->dev);
|
|
if (!in_dev)
|
|
continue;
|
|
im = rcu_dereference(in_dev->mc_list);
|
|
if (im) {
|
|
state->in_dev = in_dev;
|
|
break;
|
|
}
|
|
}
|
|
return im;
|
|
}
|
|
|
|
static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
|
|
{
|
|
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
|
|
|
|
im = rcu_dereference(im->next_rcu);
|
|
while (!im) {
|
|
state->dev = next_net_device_rcu(state->dev);
|
|
if (!state->dev) {
|
|
state->in_dev = NULL;
|
|
break;
|
|
}
|
|
state->in_dev = __in_dev_get_rcu(state->dev);
|
|
if (!state->in_dev)
|
|
continue;
|
|
im = rcu_dereference(state->in_dev->mc_list);
|
|
}
|
|
return im;
|
|
}
|
|
|
|
static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct ip_mc_list *im = igmp_mc_get_first(seq);
|
|
if (im)
|
|
while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
|
|
--pos;
|
|
return pos ? NULL : im;
|
|
}
|
|
|
|
static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(rcu)
|
|
{
|
|
rcu_read_lock();
|
|
return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct ip_mc_list *im;
|
|
if (v == SEQ_START_TOKEN)
|
|
im = igmp_mc_get_first(seq);
|
|
else
|
|
im = igmp_mc_get_next(seq, v);
|
|
++*pos;
|
|
return im;
|
|
}
|
|
|
|
static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(rcu)
|
|
{
|
|
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
|
|
|
|
state->in_dev = NULL;
|
|
state->dev = NULL;
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int igmp_mc_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq,
|
|
"Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
|
|
else {
|
|
struct ip_mc_list *im = (struct ip_mc_list *)v;
|
|
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
|
|
char *querier;
|
|
long delta;
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
|
|
IGMP_V2_SEEN(state->in_dev) ? "V2" :
|
|
"V3";
|
|
#else
|
|
querier = "NONE";
|
|
#endif
|
|
|
|
if (rcu_access_pointer(state->in_dev->mc_list) == im) {
|
|
seq_printf(seq, "%d\t%-10s: %5d %7s\n",
|
|
state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
|
|
}
|
|
|
|
delta = im->timer.expires - jiffies;
|
|
seq_printf(seq,
|
|
"\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
|
|
im->multiaddr, im->users,
|
|
im->tm_running,
|
|
im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
|
|
im->reporter);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations igmp_mc_seq_ops = {
|
|
.start = igmp_mc_seq_start,
|
|
.next = igmp_mc_seq_next,
|
|
.stop = igmp_mc_seq_stop,
|
|
.show = igmp_mc_seq_show,
|
|
};
|
|
|
|
struct igmp_mcf_iter_state {
|
|
struct seq_net_private p;
|
|
struct net_device *dev;
|
|
struct in_device *idev;
|
|
struct ip_mc_list *im;
|
|
};
|
|
|
|
#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
|
|
|
|
static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
struct ip_sf_list *psf = NULL;
|
|
struct ip_mc_list *im = NULL;
|
|
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
|
|
|
|
state->idev = NULL;
|
|
state->im = NULL;
|
|
for_each_netdev_rcu(net, state->dev) {
|
|
struct in_device *idev;
|
|
idev = __in_dev_get_rcu(state->dev);
|
|
if (unlikely(!idev))
|
|
continue;
|
|
im = rcu_dereference(idev->mc_list);
|
|
if (likely(im)) {
|
|
spin_lock_bh(&im->lock);
|
|
psf = im->sources;
|
|
if (likely(psf)) {
|
|
state->im = im;
|
|
state->idev = idev;
|
|
break;
|
|
}
|
|
spin_unlock_bh(&im->lock);
|
|
}
|
|
}
|
|
return psf;
|
|
}
|
|
|
|
static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
|
|
{
|
|
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
|
|
|
|
psf = psf->sf_next;
|
|
while (!psf) {
|
|
spin_unlock_bh(&state->im->lock);
|
|
state->im = state->im->next;
|
|
while (!state->im) {
|
|
state->dev = next_net_device_rcu(state->dev);
|
|
if (!state->dev) {
|
|
state->idev = NULL;
|
|
goto out;
|
|
}
|
|
state->idev = __in_dev_get_rcu(state->dev);
|
|
if (!state->idev)
|
|
continue;
|
|
state->im = rcu_dereference(state->idev->mc_list);
|
|
}
|
|
if (!state->im)
|
|
break;
|
|
spin_lock_bh(&state->im->lock);
|
|
psf = state->im->sources;
|
|
}
|
|
out:
|
|
return psf;
|
|
}
|
|
|
|
static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct ip_sf_list *psf = igmp_mcf_get_first(seq);
|
|
if (psf)
|
|
while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
|
|
--pos;
|
|
return pos ? NULL : psf;
|
|
}
|
|
|
|
static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(rcu)
|
|
{
|
|
rcu_read_lock();
|
|
return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct ip_sf_list *psf;
|
|
if (v == SEQ_START_TOKEN)
|
|
psf = igmp_mcf_get_first(seq);
|
|
else
|
|
psf = igmp_mcf_get_next(seq, v);
|
|
++*pos;
|
|
return psf;
|
|
}
|
|
|
|
static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(rcu)
|
|
{
|
|
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
|
|
if (likely(state->im)) {
|
|
spin_unlock_bh(&state->im->lock);
|
|
state->im = NULL;
|
|
}
|
|
state->idev = NULL;
|
|
state->dev = NULL;
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct ip_sf_list *psf = (struct ip_sf_list *)v;
|
|
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
|
|
} else {
|
|
seq_printf(seq,
|
|
"%3d %6.6s 0x%08x "
|
|
"0x%08x %6lu %6lu\n",
|
|
state->dev->ifindex, state->dev->name,
|
|
ntohl(state->im->multiaddr),
|
|
ntohl(psf->sf_inaddr),
|
|
psf->sf_count[MCAST_INCLUDE],
|
|
psf->sf_count[MCAST_EXCLUDE]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations igmp_mcf_seq_ops = {
|
|
.start = igmp_mcf_seq_start,
|
|
.next = igmp_mcf_seq_next,
|
|
.stop = igmp_mcf_seq_stop,
|
|
.show = igmp_mcf_seq_show,
|
|
};
|
|
|
|
static int __net_init igmp_net_init(struct net *net)
|
|
{
|
|
struct proc_dir_entry *pde;
|
|
int err;
|
|
|
|
pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops,
|
|
sizeof(struct igmp_mc_iter_state));
|
|
if (!pde)
|
|
goto out_igmp;
|
|
pde = proc_create_net("mcfilter", 0444, net->proc_net,
|
|
&igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state));
|
|
if (!pde)
|
|
goto out_mcfilter;
|
|
err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
|
|
SOCK_DGRAM, 0, net);
|
|
if (err < 0) {
|
|
pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
|
|
err);
|
|
goto out_sock;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_sock:
|
|
remove_proc_entry("mcfilter", net->proc_net);
|
|
out_mcfilter:
|
|
remove_proc_entry("igmp", net->proc_net);
|
|
out_igmp:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void __net_exit igmp_net_exit(struct net *net)
|
|
{
|
|
remove_proc_entry("mcfilter", net->proc_net);
|
|
remove_proc_entry("igmp", net->proc_net);
|
|
inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
|
|
}
|
|
|
|
static struct pernet_operations igmp_net_ops = {
|
|
.init = igmp_net_init,
|
|
.exit = igmp_net_exit,
|
|
};
|
|
#endif
|
|
|
|
static int igmp_netdev_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct in_device *in_dev;
|
|
|
|
switch (event) {
|
|
case NETDEV_RESEND_IGMP:
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (in_dev)
|
|
ip_mc_rejoin_groups(in_dev);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block igmp_notifier = {
|
|
.notifier_call = igmp_netdev_event,
|
|
};
|
|
|
|
int __init igmp_mc_init(void)
|
|
{
|
|
#if defined(CONFIG_PROC_FS)
|
|
int err;
|
|
|
|
err = register_pernet_subsys(&igmp_net_ops);
|
|
if (err)
|
|
return err;
|
|
err = register_netdevice_notifier(&igmp_notifier);
|
|
if (err)
|
|
goto reg_notif_fail;
|
|
return 0;
|
|
|
|
reg_notif_fail:
|
|
unregister_pernet_subsys(&igmp_net_ops);
|
|
return err;
|
|
#else
|
|
return register_netdevice_notifier(&igmp_notifier);
|
|
#endif
|
|
}
|