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3094 lines
73 KiB
3094 lines
73 KiB
// 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 <[email protected]> |
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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: [email protected] and [email protected] |
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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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|
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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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|
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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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|
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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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|
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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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|
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#define IGMP_INITIAL_REPORT_DELAY (1) |
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|
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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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|
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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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|
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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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|
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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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|
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interval_jiffies = msecs_to_jiffies(interval_ms); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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#ifdef CONFIG_IP_MULTICAST |
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|
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/* |
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* Timer management |
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*/ |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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/* |
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* Send an IGMP report. |
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*/ |
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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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|
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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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|
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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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|
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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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|
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if (!in_dev) |
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return htonl(INADDR_ANY); |
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|
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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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|
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return htonl(INADDR_ANY); |
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} |
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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; |
|
pip->tos = 0xc0; |
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pip->frag_off = htons(IP_DF); |
|
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; |
|
((u8 *)&pip[1])[2] = 0; |
|
((u8 *)&pip[1])[3] = 0; |
|
|
|
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); |
|
pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
|
pig->resv1 = 0; |
|
pig->csum = 0; |
|
pig->resv2 = 0; |
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pig->ngrec = 0; |
|
return skb; |
|
} |
|
|
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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); |
|
} |
|
|
|
static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) |
|
{ |
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return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
|
} |
|
|
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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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struct net_device *dev = pmc->interface->dev; |
|
struct igmpv3_report *pih; |
|
struct igmpv3_grec *pgr; |
|
|
|
if (!skb) { |
|
skb = igmpv3_newpack(dev, mtu); |
|
if (!skb) |
|
return NULL; |
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} |
|
pgr = skb_put(skb, sizeof(struct igmpv3_grec)); |
|
pgr->grec_type = type; |
|
pgr->grec_auxwords = 0; |
|
pgr->grec_nsrcs = 0; |
|
pgr->grec_mca = pmc->multiaddr; |
|
pih = igmpv3_report_hdr(skb); |
|
pih->ngrec = htons(ntohs(pih->ngrec)+1); |
|
*ppgr = pgr; |
|
return skb; |
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} |
|
|
|
#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
|
|
|
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) |
|
{ |
|
struct net_device *dev = pmc->interface->dev; |
|
struct net *net = dev_net(dev); |
|
struct igmpv3_report *pih; |
|
struct igmpv3_grec *pgr = NULL; |
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struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; |
|
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; |
|
|
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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 && |
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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); |
|
u32 mr_ifc_count; |
|
|
|
igmpv3_send_cr(in_dev); |
|
restart: |
|
mr_ifc_count = READ_ONCE(in_dev->mr_ifc_count); |
|
|
|
if (mr_ifc_count) { |
|
if (cmpxchg(&in_dev->mr_ifc_count, |
|
mr_ifc_count, |
|
mr_ifc_count - 1) != mr_ifc_count) |
|
goto restart; |
|
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; |
|
WRITE_ONCE(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 */ |
|
WRITE_ONCE(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 |
|
WRITE_ONCE(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_mc_clear_src(i); |
|
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; |
|
WRITE_ONCE(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; |
|
WRITE_ONCE(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(struct_size(psf, sl_addr, 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, struct_size(newpsl, sl_addr, 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(struct_size(psl, sl_addr, 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, struct_size(newpsl, sl_addr, |
|
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_flex, |
|
flex_array_size(msf, imsf_slist_flex, msf->imsf_numsrc)); |
|
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, |
|
struct_size(newpsl, sl_addr, |
|
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(struct_size(psl, sl_addr, 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 = flex_array_size(psl, sl_addr, copycount); |
|
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_flex[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) { |
|
spin_lock_bh(&im->lock); |
|
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; |
|
spin_unlock_bh(&im->lock); |
|
} 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 |
|
}
|
|
|