| /* |
| * Linux NET3: Internet Group Management Protocol [IGMP] |
| * |
| * This code implements the IGMP protocol as defined in RFC1112. There has |
| * been a further revision of this protocol since which is now supported. |
| * |
| * If you have trouble with this module be careful what gcc you have used, |
| * the older version didn't come out right using gcc 2.5.8, the newer one |
| * seems to fall out with gcc 2.6.2. |
| * |
| * Authors: |
| * Alan Cox <alan@lxorguk.ukuu.org.uk> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * Fixes: |
| * |
| * Alan Cox : Added lots of __inline__ to optimise |
| * the memory usage of all the tiny little |
| * functions. |
| * Alan Cox : Dumped the header building experiment. |
| * Alan Cox : Minor tweaks ready for multicast routing |
| * and extended IGMP protocol. |
| * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 |
| * writes utterly bogus code otherwise (sigh) |
| * fixed IGMP loopback to behave in the manner |
| * desired by mrouted, fixed the fact it has been |
| * broken since 1.3.6 and cleaned up a few minor |
| * points. |
| * |
| * Chih-Jen Chang : Tried to revise IGMP to Version 2 |
| * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu |
| * The enhancements are mainly based on Steve Deering's |
| * ipmulti-3.5 source code. |
| * Chih-Jen Chang : Added the igmp_get_mrouter_info and |
| * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of |
| * the mrouted version on that device. |
| * Chih-Jen Chang : Added the max_resp_time parameter to |
| * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter |
| * to identify the multicast router version |
| * and do what the IGMP version 2 specified. |
| * Chih-Jen Chang : Added a timer to revert to IGMP V2 router |
| * Tsu-Sheng Tsao if the specified time expired. |
| * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. |
| * Alan Cox : Use GFP_ATOMIC in the right places. |
| * Christian Daudt : igmp timer wasn't set for local group |
| * memberships but was being deleted, |
| * which caused a "del_timer() called |
| * from %p with timer not initialized\n" |
| * message (960131). |
| * Christian Daudt : removed del_timer from |
| * igmp_timer_expire function (960205). |
| * Christian Daudt : igmp_heard_report now only calls |
| * igmp_timer_expire if tm->running is |
| * true (960216). |
| * Malcolm Beattie : ttl comparison wrong in igmp_rcv made |
| * igmp_heard_query never trigger. Expiry |
| * miscalculation fixed in igmp_heard_query |
| * and random() made to return unsigned to |
| * prevent negative expiry times. |
| * Alexey Kuznetsov: Wrong group leaving behaviour, backport |
| * fix from pending 2.1.x patches. |
| * Alan Cox: Forget to enable FDDI support earlier. |
| * Alexey Kuznetsov: Fixed leaving groups on device down. |
| * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. |
| * David L Stevens: IGMPv3 support, with help from |
| * Vinay Kulkarni |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/uaccess.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/jiffies.h> |
| #include <linux/string.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/in.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/inetdevice.h> |
| #include <linux/igmp.h> |
| #include <linux/if_arp.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/times.h> |
| #include <linux/pkt_sched.h> |
| #include <linux/byteorder/generic.h> |
| |
| #include <net/net_namespace.h> |
| #include <net/arp.h> |
| #include <net/ip.h> |
| #include <net/protocol.h> |
| #include <net/route.h> |
| #include <net/sock.h> |
| #include <net/checksum.h> |
| #include <net/inet_common.h> |
| #include <linux/netfilter_ipv4.h> |
| #ifdef CONFIG_IP_MROUTE |
| #include <linux/mroute.h> |
| #endif |
| #ifdef CONFIG_PROC_FS |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #endif |
| |
| #ifdef CONFIG_IP_MULTICAST |
| /* Parameter names and values are taken from igmp-v2-06 draft */ |
| |
| #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) |
| #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) |
| #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) |
| #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) |
| #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) |
| #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 |
| |
| |
| #define IGMP_INITIAL_REPORT_DELAY (1) |
| |
| /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
| * IGMP specs require to report membership immediately after |
| * joining a group, but we delay the first report by a |
| * small interval. It seems more natural and still does not |
| * contradict to specs provided this delay is small enough. |
| */ |
| |
| #define IGMP_V1_SEEN(in_dev) \ |
| (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
| IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
| ((in_dev)->mr_v1_seen && \ |
| time_before(jiffies, (in_dev)->mr_v1_seen))) |
| #define IGMP_V2_SEEN(in_dev) \ |
| (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
| IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
| ((in_dev)->mr_v2_seen && \ |
| time_before(jiffies, (in_dev)->mr_v2_seen))) |
| |
| static int unsolicited_report_interval(struct in_device *in_dev) |
| { |
| int interval_ms, interval_jiffies; |
| |
| if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
| interval_ms = IN_DEV_CONF_GET( |
| in_dev, |
| IGMPV2_UNSOLICITED_REPORT_INTERVAL); |
| else /* v3 */ |
| interval_ms = IN_DEV_CONF_GET( |
| in_dev, |
| IGMPV3_UNSOLICITED_REPORT_INTERVAL); |
| |
| interval_jiffies = msecs_to_jiffies(interval_ms); |
| |
| /* _timer functions can't handle a delay of 0 jiffies so ensure |
| * we always return a positive value. |
| */ |
| if (interval_jiffies <= 0) |
| interval_jiffies = 1; |
| return interval_jiffies; |
| } |
| |
| static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
| static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
| static void igmpv3_clear_delrec(struct in_device *in_dev); |
| static int sf_setstate(struct ip_mc_list *pmc); |
| static void sf_markstate(struct ip_mc_list *pmc); |
| #endif |
| static void ip_mc_clear_src(struct ip_mc_list *pmc); |
| static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
| int sfcount, __be32 *psfsrc, int delta); |
| |
| static void ip_ma_put(struct ip_mc_list *im) |
| { |
| if (refcount_dec_and_test(&im->refcnt)) { |
| in_dev_put(im->interface); |
| kfree_rcu(im, rcu); |
| } |
| } |
| |
| #define for_each_pmc_rcu(in_dev, pmc) \ |
| for (pmc = rcu_dereference(in_dev->mc_list); \ |
| pmc != NULL; \ |
| pmc = rcu_dereference(pmc->next_rcu)) |
| |
| #define for_each_pmc_rtnl(in_dev, pmc) \ |
| for (pmc = rtnl_dereference(in_dev->mc_list); \ |
| pmc != NULL; \ |
| pmc = rtnl_dereference(pmc->next_rcu)) |
| |
| #ifdef CONFIG_IP_MULTICAST |
| |
| /* |
| * Timer management |
| */ |
| |
| static void igmp_stop_timer(struct ip_mc_list *im) |
| { |
| spin_lock_bh(&im->lock); |
| if (del_timer(&im->timer)) |
| refcount_dec(&im->refcnt); |
| im->tm_running = 0; |
| im->reporter = 0; |
| im->unsolicit_count = 0; |
| spin_unlock_bh(&im->lock); |
| } |
| |
| /* It must be called with locked im->lock */ |
| static void igmp_start_timer(struct ip_mc_list *im, int max_delay) |
| { |
| int tv = prandom_u32() % max_delay; |
| |
| im->tm_running = 1; |
| if (!mod_timer(&im->timer, jiffies+tv+2)) |
| refcount_inc(&im->refcnt); |
| } |
| |
| static void igmp_gq_start_timer(struct in_device *in_dev) |
| { |
| int tv = prandom_u32() % in_dev->mr_maxdelay; |
| unsigned long exp = jiffies + tv + 2; |
| |
| if (in_dev->mr_gq_running && |
| time_after_eq(exp, (in_dev->mr_gq_timer).expires)) |
| return; |
| |
| in_dev->mr_gq_running = 1; |
| if (!mod_timer(&in_dev->mr_gq_timer, exp)) |
| in_dev_hold(in_dev); |
| } |
| |
| static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) |
| { |
| int tv = prandom_u32() % delay; |
| |
| if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) |
| in_dev_hold(in_dev); |
| } |
| |
| static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) |
| { |
| spin_lock_bh(&im->lock); |
| im->unsolicit_count = 0; |
| if (del_timer(&im->timer)) { |
| if ((long)(im->timer.expires-jiffies) < max_delay) { |
| add_timer(&im->timer); |
| im->tm_running = 1; |
| spin_unlock_bh(&im->lock); |
| return; |
| } |
| refcount_dec(&im->refcnt); |
| } |
| igmp_start_timer(im, max_delay); |
| spin_unlock_bh(&im->lock); |
| } |
| |
| |
| /* |
| * Send an IGMP report. |
| */ |
| |
| #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) |
| |
| |
| static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, |
| int gdeleted, int sdeleted) |
| { |
| switch (type) { |
| case IGMPV3_MODE_IS_INCLUDE: |
| case IGMPV3_MODE_IS_EXCLUDE: |
| if (gdeleted || sdeleted) |
| return 0; |
| if (!(pmc->gsquery && !psf->sf_gsresp)) { |
| if (pmc->sfmode == MCAST_INCLUDE) |
| return 1; |
| /* don't include if this source is excluded |
| * in all filters |
| */ |
| if (psf->sf_count[MCAST_INCLUDE]) |
| return type == IGMPV3_MODE_IS_INCLUDE; |
| return pmc->sfcount[MCAST_EXCLUDE] == |
| psf->sf_count[MCAST_EXCLUDE]; |
| } |
| return 0; |
| case IGMPV3_CHANGE_TO_INCLUDE: |
| if (gdeleted || sdeleted) |
| return 0; |
| return psf->sf_count[MCAST_INCLUDE] != 0; |
| case IGMPV3_CHANGE_TO_EXCLUDE: |
| if (gdeleted || sdeleted) |
| return 0; |
| if (pmc->sfcount[MCAST_EXCLUDE] == 0 || |
| psf->sf_count[MCAST_INCLUDE]) |
| return 0; |
| return pmc->sfcount[MCAST_EXCLUDE] == |
| psf->sf_count[MCAST_EXCLUDE]; |
| case IGMPV3_ALLOW_NEW_SOURCES: |
| if (gdeleted || !psf->sf_crcount) |
| return 0; |
| return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; |
| case IGMPV3_BLOCK_OLD_SOURCES: |
| if (pmc->sfmode == MCAST_INCLUDE) |
| return gdeleted || (psf->sf_crcount && sdeleted); |
| return psf->sf_crcount && !gdeleted && !sdeleted; |
| } |
| return 0; |
| } |
| |
| static int |
| igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) |
| { |
| struct ip_sf_list *psf; |
| int scount = 0; |
| |
| for (psf = pmc->sources; psf; psf = psf->sf_next) { |
| if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
| continue; |
| scount++; |
| } |
| return scount; |
| } |
| |
| /* source address selection per RFC 3376 section 4.2.13 */ |
| static __be32 igmpv3_get_srcaddr(struct net_device *dev, |
| const struct flowi4 *fl4) |
| { |
| struct in_device *in_dev = __in_dev_get_rcu(dev); |
| |
| if (!in_dev) |
| return htonl(INADDR_ANY); |
| |
| for_ifa(in_dev) { |
| if (fl4->saddr == ifa->ifa_local) |
| return fl4->saddr; |
| } endfor_ifa(in_dev); |
| |
| return htonl(INADDR_ANY); |
| } |
| |
| static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
| { |
| struct sk_buff *skb; |
| struct rtable *rt; |
| struct iphdr *pip; |
| struct igmpv3_report *pig; |
| struct net *net = dev_net(dev); |
| struct flowi4 fl4; |
| int hlen = LL_RESERVED_SPACE(dev); |
| int tlen = dev->needed_tailroom; |
| unsigned int size = mtu; |
| |
| while (1) { |
| skb = alloc_skb(size + hlen + tlen, |
| GFP_ATOMIC | __GFP_NOWARN); |
| if (skb) |
| break; |
| size >>= 1; |
| if (size < 256) |
| return NULL; |
| } |
| skb->priority = TC_PRIO_CONTROL; |
| |
| rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
| 0, 0, |
| IPPROTO_IGMP, 0, dev->ifindex); |
| if (IS_ERR(rt)) { |
| kfree_skb(skb); |
| return NULL; |
| } |
| |
| skb_dst_set(skb, &rt->dst); |
| skb->dev = dev; |
| |
| skb_reserve(skb, hlen); |
| skb_tailroom_reserve(skb, mtu, tlen); |
| |
| skb_reset_network_header(skb); |
| pip = ip_hdr(skb); |
| skb_put(skb, sizeof(struct iphdr) + 4); |
| |
| pip->version = 4; |
| pip->ihl = (sizeof(struct iphdr)+4)>>2; |
| pip->tos = 0xc0; |
| pip->frag_off = htons(IP_DF); |
| pip->ttl = 1; |
| pip->daddr = fl4.daddr; |
| |
| rcu_read_lock(); |
| pip->saddr = igmpv3_get_srcaddr(dev, &fl4); |
| rcu_read_unlock(); |
| |
| pip->protocol = IPPROTO_IGMP; |
| pip->tot_len = 0; /* filled in later */ |
| ip_select_ident(net, skb, NULL); |
| ((u8 *)&pip[1])[0] = IPOPT_RA; |
| ((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; |
| skb_put(skb, sizeof(*pig)); |
| pig = igmpv3_report_hdr(skb); |
| pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
| pig->resv1 = 0; |
| pig->csum = 0; |
| pig->resv2 = 0; |
| pig->ngrec = 0; |
| return skb; |
| } |
| |
| static int igmpv3_sendpack(struct sk_buff *skb) |
| { |
| struct igmphdr *pig = igmp_hdr(skb); |
| const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
| |
| pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
| |
| 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) |
| { |
| return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
| } |
| |
| static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, |
| int type, struct igmpv3_grec **ppgr, unsigned int mtu) |
| { |
| 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; |
| } |
| 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; |
| } |
| |
| #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
| |
| static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, |
| 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; |
| 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; |
| |
| stotal = scount = 0; |
| |
| psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
| |
| if (!*psf_list) |
| goto empty_source; |
| |
| pih = skb ? igmpv3_report_hdr(skb) : NULL; |
| |
| /* EX and TO_EX get a fresh packet, if needed */ |
| if (truncate) { |
| if (pih && pih->ngrec && |
| AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { |
| if (skb) |
| igmpv3_sendpack(skb); |
| skb = igmpv3_newpack(dev, mtu); |
| } |
| } |
| first = 1; |
| psf_prev = NULL; |
| for (psf = *psf_list; psf; psf = psf_next) { |
| __be32 *psrc; |
| |
| psf_next = psf->sf_next; |
| |
| if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { |
| psf_prev = psf; |
| continue; |
| } |
| |
| /* Based on RFC3376 5.1. Should not send source-list change |
| * records when there is a filter mode change. |
| */ |
| if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || |
| (!gdeleted && pmc->crcount)) && |
| (type == IGMPV3_ALLOW_NEW_SOURCES || |
| type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) |
| goto decrease_sf_crcount; |
| |
| /* clear marks on query responses */ |
| if (isquery) |
| psf->sf_gsresp = 0; |
| |
| if (AVAILABLE(skb) < sizeof(__be32) + |
| first*sizeof(struct igmpv3_grec)) { |
| if (truncate && !first) |
| break; /* truncate these */ |
| if (pgr) |
| pgr->grec_nsrcs = htons(scount); |
| if (skb) |
| igmpv3_sendpack(skb); |
| skb = igmpv3_newpack(dev, mtu); |
| first = 1; |
| scount = 0; |
| } |
| if (first) { |
| skb = add_grhead(skb, pmc, type, &pgr, mtu); |
| first = 0; |
| } |
| if (!skb) |
| return NULL; |
| psrc = skb_put(skb, sizeof(__be32)); |
| *psrc = psf->sf_inaddr; |
| scount++; stotal++; |
| if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
| type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { |
| decrease_sf_crcount: |
| psf->sf_crcount--; |
| if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { |
| if (psf_prev) |
| psf_prev->sf_next = psf->sf_next; |
| else |
| *psf_list = psf->sf_next; |
| kfree(psf); |
| continue; |
| } |
| } |
| psf_prev = psf; |
| } |
| |
| empty_source: |
| if (!stotal) { |
| if (type == IGMPV3_ALLOW_NEW_SOURCES || |
| type == IGMPV3_BLOCK_OLD_SOURCES) |
| return skb; |
| if (pmc->crcount || isquery) { |
| /* make sure we have room for group header */ |
| if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
| igmpv3_sendpack(skb); |
| skb = NULL; /* add_grhead will get a new one */ |
| } |
| skb = add_grhead(skb, pmc, type, &pgr, mtu); |
| } |
| } |
| if (pgr) |
| pgr->grec_nsrcs = htons(scount); |
| |
| if (isquery) |
| pmc->gsquery = 0; /* clear query state on report */ |
| return skb; |
| } |
| |
| static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) |
| { |
| struct sk_buff *skb = NULL; |
| struct net *net = dev_net(in_dev->dev); |
| int type; |
| |
| if (!pmc) { |
| rcu_read_lock(); |
| for_each_pmc_rcu(in_dev, pmc) { |
| if (pmc->multiaddr == IGMP_ALL_HOSTS) |
| continue; |
| if (ipv4_is_local_multicast(pmc->multiaddr) && |
| !net->ipv4.sysctl_igmp_llm_reports) |
| continue; |
| spin_lock_bh(&pmc->lock); |
| if (pmc->sfcount[MCAST_EXCLUDE]) |
| type = IGMPV3_MODE_IS_EXCLUDE; |
| else |
| type = IGMPV3_MODE_IS_INCLUDE; |
| skb = add_grec(skb, pmc, type, 0, 0); |
| spin_unlock_bh(&pmc->lock); |
| } |
| rcu_read_unlock(); |
| } else { |
| spin_lock_bh(&pmc->lock); |
| if (pmc->sfcount[MCAST_EXCLUDE]) |
| type = IGMPV3_MODE_IS_EXCLUDE; |
| else |
| type = IGMPV3_MODE_IS_INCLUDE; |
| skb = add_grec(skb, pmc, type, 0, 0); |
| spin_unlock_bh(&pmc->lock); |
| } |
| if (!skb) |
| return 0; |
| return igmpv3_sendpack(skb); |
| } |
| |
| /* |
| * remove zero-count source records from a source filter list |
| */ |
| static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) |
| { |
| struct ip_sf_list *psf_prev, *psf_next, *psf; |
| |
| psf_prev = NULL; |
| for (psf = *ppsf; psf; psf = psf_next) { |
| psf_next = psf->sf_next; |
| if (psf->sf_crcount == 0) { |
| if (psf_prev) |
| psf_prev->sf_next = psf->sf_next; |
| else |
| *ppsf = psf->sf_next; |
| kfree(psf); |
| } else |
| psf_prev = psf; |
| } |
| } |
| |
| static void 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); |
| } else |
| pmc_prev = pmc; |
| } |
| spin_unlock_bh(&in_dev->mc_tomb_lock); |
| |
| /* change recs */ |
| for_each_pmc_rcu(in_dev, pmc) { |
| spin_lock_bh(&pmc->lock); |
| if (pmc->sfcount[MCAST_EXCLUDE]) { |
| type = IGMPV3_BLOCK_OLD_SOURCES; |
| dtype = IGMPV3_ALLOW_NEW_SOURCES; |
| } else { |
| type = IGMPV3_ALLOW_NEW_SOURCES; |
| dtype = IGMPV3_BLOCK_OLD_SOURCES; |
| } |
| skb = add_grec(skb, pmc, type, 0, 0); |
| skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ |
| |
| /* filter mode changes */ |
| if (pmc->crcount) { |
| if (pmc->sfmode == MCAST_EXCLUDE) |
| type = IGMPV3_CHANGE_TO_EXCLUDE; |
| else |
| type = IGMPV3_CHANGE_TO_INCLUDE; |
| skb = add_grec(skb, pmc, type, 0, 0); |
| pmc->crcount--; |
| } |
| spin_unlock_bh(&pmc->lock); |
| } |
| rcu_read_unlock(); |
| |
| if (!skb) |
| return; |
| (void) igmpv3_sendpack(skb); |
| } |
| |
| static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, |
| int type) |
| { |
| struct sk_buff *skb; |
| struct iphdr *iph; |
| struct igmphdr *ih; |
| struct rtable *rt; |
| struct net_device *dev = in_dev->dev; |
| struct net *net = dev_net(dev); |
| __be32 group = pmc ? pmc->multiaddr : 0; |
| struct flowi4 fl4; |
| __be32 dst; |
| int hlen, tlen; |
| |
| if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) |
| return igmpv3_send_report(in_dev, pmc); |
| |
| if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
| return 0; |
| |
| if (type == IGMP_HOST_LEAVE_MESSAGE) |
| dst = IGMP_ALL_ROUTER; |
| else |
| dst = group; |
| |
| rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
| 0, 0, |
| IPPROTO_IGMP, 0, dev->ifindex); |
| if (IS_ERR(rt)) |
| return -1; |
| |
| hlen = LL_RESERVED_SPACE(dev); |
| tlen = dev->needed_tailroom; |
| skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); |
| if (!skb) { |
| ip_rt_put(rt); |
| return -1; |
| } |
| skb->priority = TC_PRIO_CONTROL; |
| |
| skb_dst_set(skb, &rt->dst); |
| |
| skb_reserve(skb, hlen); |
| |
| skb_reset_network_header(skb); |
| iph = ip_hdr(skb); |
| skb_put(skb, sizeof(struct iphdr) + 4); |
| |
| iph->version = 4; |
| iph->ihl = (sizeof(struct iphdr)+4)>>2; |
| iph->tos = 0xc0; |
| iph->frag_off = htons(IP_DF); |
| iph->ttl = 1; |
| iph->daddr = dst; |
| iph->saddr = fl4.saddr; |
| iph->protocol = IPPROTO_IGMP; |
| ip_select_ident(net, skb, NULL); |
| ((u8 *)&iph[1])[0] = IPOPT_RA; |
| ((u8 *)&iph[1])[1] = 4; |
| ((u8 *)&iph[1])[2] = 0; |
| ((u8 *)&iph[1])[3] = 0; |
| |
| ih = skb_put(skb, sizeof(struct igmphdr)); |
| ih->type = type; |
| ih->code = 0; |
| ih->csum = 0; |
| ih->group = group; |
| ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); |
| |
| return ip_local_out(net, skb->sk, skb); |
| } |
| |
| static void igmp_gq_timer_expire(struct timer_list *t) |
| { |
| struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); |
| |
| in_dev->mr_gq_running = 0; |
| igmpv3_send_report(in_dev, NULL); |
| in_dev_put(in_dev); |
| } |
| |
| static void igmp_ifc_timer_expire(struct timer_list *t) |
| { |
| struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); |
| |
| igmpv3_send_cr(in_dev); |
| if (in_dev->mr_ifc_count) { |
| in_dev->mr_ifc_count--; |
| igmp_ifc_start_timer(in_dev, |
| unsolicited_report_interval(in_dev)); |
| } |
| in_dev_put(in_dev); |
| } |
| |
| static void igmp_ifc_event(struct in_device *in_dev) |
| { |
| struct net *net = dev_net(in_dev->dev); |
| if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
| return; |
| in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
| igmp_ifc_start_timer(in_dev, 1); |
| } |
| |
| |
| static void igmp_timer_expire(struct timer_list *t) |
| { |
| struct ip_mc_list *im = from_timer(im, t, timer); |
| struct in_device *in_dev = im->interface; |
| |
| spin_lock(&im->lock); |
| im->tm_running = 0; |
| |
| if (im->unsolicit_count) { |
| im->unsolicit_count--; |
| igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
| } |
| im->reporter = 1; |
| spin_unlock(&im->lock); |
| |
| if (IGMP_V1_SEEN(in_dev)) |
| igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); |
| else if (IGMP_V2_SEEN(in_dev)) |
| igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); |
| else |
| igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); |
| |
| ip_ma_put(im); |
| } |
| |
| /* mark EXCLUDE-mode sources */ |
| static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
| { |
| struct ip_sf_list *psf; |
| int i, scount; |
| |
| scount = 0; |
| for (psf = pmc->sources; psf; psf = psf->sf_next) { |
| if (scount == nsrcs) |
| break; |
| for (i = 0; i < nsrcs; i++) { |
| /* skip inactive filters */ |
| if (psf->sf_count[MCAST_INCLUDE] || |
| pmc->sfcount[MCAST_EXCLUDE] != |
| psf->sf_count[MCAST_EXCLUDE]) |
| break; |
| if (srcs[i] == psf->sf_inaddr) { |
| scount++; |
| break; |
| } |
| } |
| } |
| pmc->gsquery = 0; |
| if (scount == nsrcs) /* all sources excluded */ |
| return 0; |
| return 1; |
| } |
| |
| static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
| { |
| struct ip_sf_list *psf; |
| int i, scount; |
| |
| if (pmc->sfmode == MCAST_EXCLUDE) |
| return igmp_xmarksources(pmc, nsrcs, srcs); |
| |
| /* mark INCLUDE-mode sources */ |
| scount = 0; |
| for (psf = pmc->sources; psf; psf = psf->sf_next) { |
| if (scount == nsrcs) |
| break; |
| for (i = 0; i < nsrcs; i++) |
| if (srcs[i] == psf->sf_inaddr) { |
| psf->sf_gsresp = 1; |
| scount++; |
| break; |
| } |
| } |
| if (!scount) { |
| pmc->gsquery = 0; |
| return 0; |
| } |
| pmc->gsquery = 1; |
| return 1; |
| } |
| |
| /* return true if packet was dropped */ |
| static bool igmp_heard_report(struct in_device *in_dev, __be32 group) |
| { |
| struct ip_mc_list *im; |
| struct net *net = dev_net(in_dev->dev); |
| |
| /* Timers are only set for non-local groups */ |
| |
| if (group == IGMP_ALL_HOSTS) |
| return false; |
| if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
| return false; |
| |
| rcu_read_lock(); |
| for_each_pmc_rcu(in_dev, im) { |
| if (im->multiaddr == group) { |
| igmp_stop_timer(im); |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| return false; |
| } |
| |
| /* return true if packet was dropped */ |
| static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, |
| int len) |
| { |
| struct igmphdr *ih = igmp_hdr(skb); |
| struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); |
| struct ip_mc_list *im; |
| __be32 group = ih->group; |
| int max_delay; |
| int mark = 0; |
| struct net *net = dev_net(in_dev->dev); |
| |
| |
| if (len == 8) { |
| if (ih->code == 0) { |
| /* Alas, old v1 router presents here. */ |
| |
| max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
| in_dev->mr_v1_seen = jiffies + |
| IGMP_V1_ROUTER_PRESENT_TIMEOUT; |
| group = 0; |
| } else { |
| /* v2 router present */ |
| max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); |
| in_dev->mr_v2_seen = jiffies + |
| IGMP_V2_ROUTER_PRESENT_TIMEOUT; |
| } |
| /* cancel the interface change timer */ |
| in_dev->mr_ifc_count = 0; |
| if (del_timer(&in_dev->mr_ifc_timer)) |
| __in_dev_put(in_dev); |
| /* clear deleted report items */ |
| igmpv3_clear_delrec(in_dev); |
| } else if (len < 12) { |
| return true; /* ignore bogus packet; freed by caller */ |
| } else if (IGMP_V1_SEEN(in_dev)) { |
| /* This is a v3 query with v1 queriers present */ |
| max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
| group = 0; |
| } else if (IGMP_V2_SEEN(in_dev)) { |
| /* this is a v3 query with v2 queriers present; |
| * Interpretation of the max_delay code is problematic here. |
| * A real v2 host would use ih_code directly, while v3 has a |
| * different encoding. We use the v3 encoding as more likely |
| * to be intended in a v3 query. |
| */ |
| max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); |
| if (!max_delay) |
| max_delay = 1; /* can't mod w/ 0 */ |
| } else { /* v3 */ |
| if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) |
| return true; |
| |
| ih3 = igmpv3_query_hdr(skb); |
| if (ih3->nsrcs) { |
| if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
| + ntohs(ih3->nsrcs)*sizeof(__be32))) |
| return true; |
| ih3 = igmpv3_query_hdr(skb); |
| } |
| |
| max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); |
| if (!max_delay) |
| max_delay = 1; /* can't mod w/ 0 */ |
| in_dev->mr_maxdelay = max_delay; |
| if (ih3->qrv) |
| in_dev->mr_qrv = ih3->qrv; |
| 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) |
| { |
| 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_KERNEL); |
| 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) { |
| im->tomb = pmc->tomb; |
| 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); |
| } |
| 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); |
| } |
| /* clear dead sources, too */ |
| rcu_read_lock(); |
| for_each_pmc_rcu(in_dev, pmc) { |
| struct ip_sf_list *psf, *psf_next; |
| |
| spin_lock_bh(&pmc->lock); |
| psf = pmc->tomb; |
| pmc->tomb = NULL; |
| spin_unlock_bh(&pmc->lock); |
| for (; psf; psf = psf_next) { |
| psf_next = psf->sf_next; |
| kfree(psf); |
| } |
| } |
| rcu_read_unlock(); |
| } |
| #endif |
| |
| static void igmp_group_dropped(struct ip_mc_list *im) |
| { |
| 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); |
| |
| igmp_ifc_event(in_dev); |
| } |
| #endif |
| } |
| |
| 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; |
| 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) |
| { |
| struct ip_mc_list *im; |
| #ifdef CONFIG_IP_MULTICAST |
| struct net *net = dev_net(in_dev->dev); |
| #endif |
| |
| 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_KERNEL); |
| 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); |
| im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; |
| #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) |
| { |
| __ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE); |
| } |
| 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 pskb_may_pull(skb, len) ? 0 : -EINVAL; |
| } |
| |
| static int ip_mc_check_igmp_query(struct sk_buff *skb) |
| { |
| unsigned int len = skb_transport_offset(skb); |
| |
| len += sizeof(struct igmphdr); |
| if (skb->len < len) |
| return -EINVAL; |
| |
| /* IGMPv{1,2}? */ |
| if (skb->len != len) { |
| /* or IGMPv3? */ |
| len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); |
| if (skb->len < len || !pskb_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: |
| /* fall through */ |
| 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 inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) |
| { |
| return skb_checksum_simple_validate(skb); |
| } |
| |
| static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) |
| |
| { |
| struct sk_buff *skb_chk; |
| unsigned int transport_len; |
| unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); |
| int ret = -EINVAL; |
| |
| transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); |
| |
| skb_chk = skb_checksum_trimmed(skb, transport_len, |
| ip_mc_validate_checksum); |
| if (!skb_chk) |
| goto err; |
| |
| if (!pskb_may_pull(skb_chk, len)) |
| goto err; |
| |
| ret = ip_mc_check_igmp_msg(skb_chk); |
| if (ret) |
| goto err; |
| |
| if (skb_trimmed) |
| *skb_trimmed = skb_chk; |
| /* free now unneeded clone */ |
| else if (skb_chk != skb) |
| kfree_skb(skb_chk); |
| |
| ret = 0; |
| |
| err: |
| if (ret && skb_chk && skb_chk != skb) |
| kfree_skb(skb_chk); |
| |
| return ret; |
| } |
| |
| /** |
| * ip_mc_check_igmp - checks whether this is a sane IGMP packet |
| * @skb: the skb to validate |
| * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) |
| * |
| * 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. |
| * |
| * Optionally, an skb pointer might be provided via skb_trimmed (or set it |
| * to NULL): After parsing an IGMP packet successfully it will point to |
| * an skb which has its tail aligned to the IP packet end. This might |
| * either be the originally provided skb or a trimmed, cloned version if |
| * the skb frame had data beyond the IP packet. A cloned skb allows us |
| * to leave the original skb and its full frame unchanged (which might be |
| * desirable for layer 2 frame jugglers). |
| * |
| * 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, struct sk_buff **skb_trimmed) |
| { |
| int ret = ip_mc_check_iphdr(skb); |
| |
| if (ret < 0) |
| return ret; |
| |
| if (ip_hdr(skb)->protocol != IPPROTO_IGMP) |
| return -ENOMSG; |
| |
| return __ip_mc_check_igmp(skb, skb_trimmed); |
| } |
| 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) |
| { |
| 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); |
| ip_mc_clear_src(i); |
| |
| if (!in_dev->dead) |
| ip_rt_multicast_event(in_dev); |
| |
| ip_ma_put(i); |
| return; |
| } |
| break; |
| } |
| } |
| } |
| EXPORT_SYMBOL(ip_mc_dec_group); |
| |
| /* Device changing type */ |
| |
| void ip_mc_unmap(struct in_device *in_dev) |
| { |
| struct ip_mc_list *pmc; |
| |
| ASSERT_RTNL(); |
| |
| for_each_pmc_rtnl(in_dev, pmc) |
| igmp_group_dropped(pmc); |
| } |
| |
| void ip_mc_remap(struct in_device *in_dev) |
| { |
| struct ip_mc_list *pmc; |
| |
| ASSERT_RTNL(); |
| |
| for_each_pmc_rtnl(in_dev, pmc) { |
| #ifdef CONFIG_IP_MULTICAST |
| igmpv3_del_delrec(in_dev, pmc); |
| #endif |
| igmp_group_added(pmc); |
| } |
| } |
| |
| /* Device going down */ |
| |
| void ip_mc_down(struct in_device *in_dev) |
| { |
| struct ip_mc_list *pmc; |
| |
| ASSERT_RTNL(); |
| |
| for_each_pmc_rtnl(in_dev, pmc) |
| igmp_group_dropped(pmc); |
| |
| #ifdef CONFIG_IP_MULTICAST |
| in_dev->mr_ifc_count = 0; |
| if (del_timer(&in_dev->mr_ifc_timer)) |
| __in_dev_put(in_dev); |
| in_dev->mr_gq_running = 0; |
| if (del_timer(&in_dev->mr_gq_timer)) |
| __in_dev_put(in_dev); |
| #endif |
| |
| ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); |
| } |
| |
| void ip_mc_init_dev(struct in_device *in_dev) |
| { |
| #ifdef CONFIG_IP_MULTICAST |
| struct net *net = dev_net(in_dev->dev); |
| #endif |
| 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); |
| in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
| #endif |
| |
| 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; |
| #ifdef CONFIG_IP_MULTICAST |
| struct net *net = dev_net(in_dev->dev); |
| #endif |
| |
| ASSERT_RTNL(); |
| |
| #ifdef CONFIG_IP_MULTICAST |
| in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
| #endif |
| ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
| |
| for_each_pmc_rtnl(in_dev, pmc) { |
| #ifdef CONFIG_IP_MULTICAST |
| igmpv3_del_delrec(in_dev, pmc); |
| #endif |
| igmp_group_added(pmc); |
| } |
| } |
| |
| /* |
| * Device is about to be destroyed: clean up. |
| */ |
| |
| void ip_mc_destroy_dev(struct in_device *in_dev) |
| { |
| struct ip_mc_list *i; |
| |
| ASSERT_RTNL(); |
| |
| /* Deactivate timers */ |
| ip_mc_down(in_dev); |
| #ifdef CONFIG_IP_MULTICAST |
| igmpv3_clear_delrec(in_dev); |
| #endif |
| |
| while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
| in_dev->mc_list = i->next_rcu; |
| in_dev->mc_count--; |
| ip_ma_put(i); |
| } |
| } |
| |
| /* RTNL is locked */ |
| static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
| { |
| struct net_device *dev = NULL; |
| struct in_device *idev = NULL; |
| |
| if (imr->imr_ifindex) { |
| idev = inetdev_by_index(net, imr->imr_ifindex); |
| return idev; |
| } |
| if (imr->imr_address.s_addr) { |
| dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
| if (!dev) |
| return NULL; |
| } |
| |
| if (!dev) { |
| struct rtable *rt = ip_route_output(net, |
| imr->imr_multiaddr.s_addr, |
| 0, 0, 0); |
| if (!IS_ERR(rt)) { |
| dev = rt->dst.dev; |
| ip_rt_put(rt); |
| } |
| } |
| if (dev) { |
| imr->imr_ifindex = dev->ifindex; |
| idev = __in_dev_get_rtnl(dev); |
| } |
| return idev; |
| } |
| |
| /* |
| * Join a socket to a group |
| */ |
| |
| static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, |
| __be32 *psfsrc) |
| { |
| struct ip_sf_list *psf, *psf_prev; |
| int rv = 0; |
| |
| psf_prev = NULL; |
| for (psf = pmc->sources; psf; psf = psf->sf_next) { |
| if (psf->sf_inaddr == *psfsrc) |
| break; |
| psf_prev = psf; |
| } |
| if (!psf || psf->sf_count[sfmode] == 0) { |
| /* source filter not found, or count wrong => bug */ |
| return -ESRCH; |
| } |
| psf->sf_count[sfmode]--; |
| if (psf->sf_count[sfmode] == 0) { |
| ip_rt_multicast_event(pmc->interface); |
| } |
| if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { |
| #ifdef CONFIG_IP_MULTICAST |
| struct in_device *in_dev = pmc->interface; |
| struct net *net = dev_net(in_dev->dev); |
| #endif |
| |
| /* no more filters for this source */ |
| if (psf_prev) |
| psf_prev->sf_next = psf->sf_next; |
| else |
| pmc->sources = psf->sf_next; |
| #ifdef CONFIG_IP_MULTICAST |
| if (psf->sf_oldin && |
| !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { |
| psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
| psf->sf_next = pmc->tomb; |
| pmc->tomb = psf; |
| rv = 1; |
| } else |
| #endif |
| kfree(psf); |
| } |
| return rv; |
| } |
| |
| #ifndef CONFIG_IP_MULTICAST |
| #define igmp_ifc_event(x) do { } while (0) |
| #endif |
| |
| static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
| int sfcount, __be32 *psfsrc, int delta) |
| { |
| struct ip_mc_list *pmc; |
| int changerec = 0; |
| int i, err; |
| |
| if (!in_dev) |
| return -ENODEV; |
| rcu_read_lock(); |
| for_each_pmc_rcu(in_dev, pmc) { |
| if (*pmca == pmc->multiaddr) |
| break; |
| } |
| if (!pmc) { |
| /* MCA not found?? bug */ |
| rcu_read_unlock(); |
| return -ESRCH; |
| } |
| spin_lock_bh(&pmc->lock); |
| rcu_read_unlock(); |
| #ifdef CONFIG_IP_MULTICAST |
| sf_markstate(pmc); |
| #endif |
| if (!delta) { |
| err = -EINVAL; |
| if (!pmc->sfcount[sfmode]) |
| goto out_unlock; |
| pmc->sfcount[sfmode]--; |
| } |
| err = 0; |
| for (i = 0; i < sfcount; i++) { |
| int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
| |
| changerec |= rv > 0; |
| if (!err && rv < 0) |
| err = rv; |
| } |
| if (pmc->sfmode == MCAST_EXCLUDE && |
| pmc->sfcount[MCAST_EXCLUDE] == 0 && |
| pmc->sfcount[MCAST_INCLUDE]) { |
| #ifdef CONFIG_IP_MULTICAST |
| struct ip_sf_list *psf; |
| struct net *net = dev_net(in_dev->dev); |
| #endif |
| |
| /* filter mode change */ |
| pmc->sfmode = MCAST_INCLUDE; |
| #ifdef CONFIG_IP_MULTICAST |
| pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
| in_dev->mr_ifc_count = pmc->crcount; |
| for (psf = pmc->sources; psf; psf = psf->sf_next) |
| psf->sf_crcount = 0; |
| igmp_ifc_event(pmc->interface); |
| } else if (sf_setstate(pmc) || changerec) { |
| igmp_ifc_event(pmc->interface); |
| #endif |
| } |
| out_unlock: |
| spin_unlock_bh(&pmc->lock); |
| return err; |
| } |
| |
| /* |
| * Add multicast single-source filter to the interface list |
| */ |
| static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, |
| __be32 *psfsrc) |
| { |
| struct ip_sf_list *psf, *psf_prev; |
| |
| psf_prev = NULL; |
| for (psf = pmc->sources; psf; psf = psf->sf_next) { |
| if (psf->sf_inaddr == *psfsrc) |
| break; |
| psf_prev = psf; |
| } |
| if (!psf) { |
| psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
| if (!psf) |
| return -ENOBUFS; |
| psf->sf_inaddr = *psfsrc; |
| if (psf_prev) { |
| psf_prev->sf_next = psf; |
| } else |
| pmc->sources = psf; |
| } |
| psf->sf_count[sfmode]++; |
| if (psf->sf_count[sfmode] == 1) { |
| ip_rt_multicast_event(pmc->interface); |
| } |
| return 0; |
| } |
| |
| #ifdef CONFIG_IP_MULTICAST |
| static void sf_markstate(struct ip_mc_list *pmc) |
| { |
| struct ip_sf_list *psf; |
| int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
| |
| for (psf = pmc->sources; psf; psf = psf->sf_next) |
| if (pmc->sfcount[MCAST_EXCLUDE]) { |
| psf->sf_oldin = mca_xcount == |
| psf->sf_count[MCAST_EXCLUDE] && |
| !psf->sf_count[MCAST_INCLUDE]; |
| } else |
| psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; |
| } |
| |
| static int sf_setstate(struct ip_mc_list *pmc) |
| { |
| struct ip_sf_list *psf, *dpsf; |
| int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
| int qrv = pmc->interface->mr_qrv; |
| int new_in, rv; |
| |
| rv = 0; |
| for (psf = pmc->sources; psf; psf = psf->sf_next) { |
| if (pmc->sfcount[MCAST_EXCLUDE]) { |
| new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && |
| !psf->sf_count[MCAST_INCLUDE]; |
| } else |
| new_in = psf->sf_count[MCAST_INCLUDE] != 0; |
| if (new_in) { |
| if (!psf->sf_oldin) { |
| struct ip_sf_list *prev = NULL; |
| |
| for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
| if (dpsf->sf_inaddr == psf->sf_inaddr) |
| break; |
| prev = dpsf; |
| } |
| if (dpsf) { |
| if (prev) |
| prev->sf_next = dpsf->sf_next; |
| else |
| pmc->tomb = dpsf->sf_next; |
| kfree(dpsf); |
| } |
| psf->sf_crcount = qrv; |
| rv++; |
| } |
| } else if (psf->sf_oldin) { |
| |
| psf->sf_crcount = 0; |
| /* |
| * add or update "delete" records if an active filter |
| * is now inactive |
| */ |
| for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
| if (dpsf->sf_inaddr == psf->sf_inaddr) |
| break; |
| if (!dpsf) { |
| dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
| if (!dpsf) |
| continue; |
| *dpsf = *psf; |
| /* pmc->lock held by callers */ |
| dpsf->sf_next = pmc->tomb; |
| pmc->tomb = dpsf; |
| } |
| dpsf->sf_crcount = qrv; |
| rv++; |
| } |
| } |
| return rv; |
| } |
| #endif |
| |
| /* |
| * Add multicast source filter list to the interface list |
| */ |
| static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
| int sfcount, __be32 *psfsrc, int delta) |
| { |
| struct ip_mc_list *pmc; |
| int isexclude; |
| int i, err; |
| |
| if (!in_dev) |
| return -ENODEV; |
| rcu_read_lock(); |
| for_each_pmc_rcu(in_dev, pmc) { |
| if (*pmca == pmc->multiaddr) |
| break; |
| } |
| if (!pmc) { |
| /* MCA not found?? bug */ |
| rcu_read_unlock(); |
| return -ESRCH; |
| } |
| spin_lock_bh(&pmc->lock); |
| rcu_read_unlock(); |
| |
| #ifdef CONFIG_IP_MULTICAST |
| sf_markstate(pmc); |
| #endif |
| isexclude = pmc->sfmode == MCAST_EXCLUDE; |
| if (!delta) |
| pmc->sfcount[sfmode]++; |
| err = 0; |
| for (i = 0; i < sfcount; i++) { |
| err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
| if (err) |
| break; |
| } |
| if (err) { |
| int j; |
| |
| if (!delta) |
| pmc->sfcount[sfmode]--; |
| for (j = 0; j < i; j++) |
| (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
| } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
| #ifdef CONFIG_IP_MULTICAST |
| struct ip_sf_list *psf; |
| struct net *net = dev_net(pmc->interface->dev); |
| in_dev = pmc->interface; |
| #endif |
| |
| /* filter mode change */ |
| if (pmc->sfcount[MCAST_EXCLUDE]) |
| pmc->sfmode = MCAST_EXCLUDE; |
| else if (pmc->sfcount[MCAST_INCLUDE]) |
| pmc->sfmode = MCAST_INCLUDE; |
| #ifdef CONFIG_IP_MULTICAST |
| /* else no filters; keep old mode for reports */ |
| |
| pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
| in_dev->mr_ifc_count = pmc->crcount; |
| for (psf = pmc->sources; psf; psf = psf->sf_next) |
| psf->sf_crcount = 0; |
| igmp_ifc_event(in_dev); |
| } else if (sf_setstate(pmc)) { |
| igmp_ifc_event(in_dev); |
| #endif |
| } |
| spin_unlock_bh(&pmc->lock); |
| return err; |
| } |
| |
| static void ip_mc_clear_src(struct ip_mc_list *pmc) |
| { |
| struct ip_sf_list *psf, *nextpsf, *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); |
| |
| for (psf = tomb; psf; psf = nextpsf) { |
| nextpsf = psf->sf_next; |
| kfree(psf); |
| } |
| for (psf = sources; psf; psf = nextpsf) { |
| nextpsf = psf->sf_next; |
| kfree(psf); |
| } |
| } |
| |
| /* 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); |
| err = 0; |
| done: |
| return err; |
| } |
| |
| /* Join ASM (Any-Source Multicast) group |
| */ |
| int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) |
| { |
| return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); |
| } |
| EXPORT_SYMBOL(ip_mc_join_group); |
| |
| /* Join SSM (Source-Specific Multicast) group |
| */ |
| int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, |
| unsigned int mode) |
| { |
| return __ip_mc_join_group(sk, imr, mode); |
| } |
| |
| static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
| struct in_device *in_dev) |
| { |
| struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
| int err; |
| |
| if (!psf) { |
| /* any-source empty exclude case */ |
| return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, |
| iml->sfmode, 0, NULL, 0); |
| } |
| err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, |
| iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
| RCU_INIT_POINTER(iml->sflist, NULL); |
| /* decrease mem now to avoid the memleak warning */ |
| atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); |
| kfree_rcu(psf, rcu); |
| return err; |
| } |
| |
| int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct ip_mc_socklist *iml; |
| struct ip_mc_socklist __rcu **imlp; |
| struct in_device *in_dev; |
| struct net *net = sock_net(sk); |
| __be32 group = imr->imr_multiaddr.s_addr; |
| u32 ifindex; |
| int ret = -EADDRNOTAVAIL; |
| |
| ASSERT_RTNL(); |
| |
| in_dev = ip_mc_find_dev(net, imr); |
| if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
| ret = -ENODEV; |
| goto out; |
| } |
| ifindex = imr->imr_ifindex; |
| for (imlp = &inet->mc_list; |
| (iml = rtnl_dereference(*imlp)) != NULL; |
| imlp = &iml->next_rcu) { |
| if (iml->multi.imr_multiaddr.s_addr != group) |
| continue; |
| if (ifindex) { |
| if (iml->multi.imr_ifindex != ifindex) |
| continue; |
| } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != |
| iml->multi.imr_address.s_addr) |
| continue; |
| |
| (void) ip_mc_leave_src(sk, iml, in_dev); |
| |
| *imlp = iml->next_rcu; |
| |
| if (in_dev) |
| ip_mc_dec_group(in_dev, group); |
| |
| /* decrease mem now to avoid the memleak warning */ |
| atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); |
| kfree_rcu(iml, rcu); |
| return 0; |
| } |
| out: |
| return ret; |
| } |
| EXPORT_SYMBOL(ip_mc_leave_group); |
| |
| int ip_mc_source(int add, int omode, struct sock *sk, struct |
| ip_mreq_source *mreqs, int ifindex) |
| { |
| int err; |
| struct ip_mreqn imr; |
| __be32 addr = mreqs->imr_multiaddr; |
| struct ip_mc_socklist *pmc; |
| struct in_device *in_dev = NULL; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ip_sf_socklist *psl; |
| struct net *net = sock_net(sk); |
| int leavegroup = 0; |
| int i, j, rv; |
| |
| if (!ipv4_is_multicast(addr)) |
| return -EINVAL; |
| |
| ASSERT_RTNL(); |
| |
| imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; |
| imr.imr_address.s_addr = mreqs->imr_interface; |
| imr.imr_ifindex = ifindex; |
| in_dev = ip_mc_find_dev(net, &imr); |
| |
| if (!in_dev) { |
| err = -ENODEV; |
| goto done; |
| } |
| err = -EADDRNOTAVAIL; |
| |
| for_each_pmc_rtnl(inet, pmc) { |
| if ((pmc->multi.imr_multiaddr.s_addr == |
| imr.imr_multiaddr.s_addr) && |
| (pmc->multi.imr_ifindex == imr.imr_ifindex)) |
| break; |
| } |
| if (!pmc) { /* must have a prior join */ |
| err = -EINVAL; |
| goto done; |
| } |
| /* if a source filter was set, must be the same mode as before */ |
| if (pmc->sflist) { |
| if (pmc->sfmode != omode) { |
| err = -EINVAL; |
| goto done; |
| } |
| } else if (pmc->sfmode != omode) { |
| /* allow mode switches for empty-set filters */ |
| ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); |
| ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
| NULL, 0); |
| pmc->sfmode = omode; |
| } |
| |
| psl = rtnl_dereference(pmc->sflist); |
| if (!add) { |
| if (!psl) |
| goto done; /* err = -EADDRNOTAVAIL */ |
| rv = !0; |
| for (i = 0; i < psl->sl_count; i++) { |
| rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
| sizeof(__be32)); |
| if (rv == 0) |
| break; |
| } |
| if (rv) /* source not found */ |
| goto done; /* err = -EADDRNOTAVAIL */ |
| |
| /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
| if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { |
| leavegroup = 1; |
| goto done; |
| } |
| |
| /* update the interface filter */ |
| ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
| &mreqs->imr_sourceaddr, 1); |
| |
| for (j = i+1; j < psl->sl_count; j++) |
| psl->sl_addr[j-1] = psl->sl_addr[j]; |
| psl->sl_count--; |
| err = 0; |
| goto done; |
| } |
| /* else, add a new source to the filter */ |
| |
| if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
| err = -ENOBUFS; |
| goto done; |
| } |
| if (!psl || psl->sl_count == psl->sl_max) { |
| struct ip_sf_socklist *newpsl; |
| int count = IP_SFBLOCK; |
| |
| if (psl) |
| count += psl->sl_max; |
| newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
| if (!newpsl) { |
| err = -ENOBUFS; |
| goto done; |
| } |
| newpsl->sl_max = count; |
| newpsl->sl_count = count - IP_SFBLOCK; |
| if (psl) { |
| for (i = 0; i < psl->sl_count; i++) |
| newpsl->sl_addr[i] = psl->sl_addr[i]; |
| /* decrease mem now to avoid the memleak warning */ |
| atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); |
| kfree_rcu(psl, rcu); |
| } |
| rcu_assign_pointer(pmc->sflist, newpsl); |
| psl = newpsl; |
| } |
| rv = 1; /* > 0 for insert logic below if sl_count is 0 */ |
| for (i = 0; i < psl->sl_count; i++) { |
| rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
| sizeof(__be32)); |
| if (rv == 0) |
| break; |
| } |
| if (rv == 0) /* address already there is an error */ |
| goto done; |
| for (j = psl->sl_count-1; j >= i; j--) |
| psl->sl_addr[j+1] = psl->sl_addr[j]; |
| psl->sl_addr[i] = mreqs->imr_sourceaddr; |
| psl->sl_count++; |
| err = 0; |
| /* update the interface list */ |
| ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
| &mreqs->imr_sourceaddr, 1); |
| done: |
| if (leavegroup) |
| err = ip_mc_leave_group(sk, &imr); |
| return err; |
| } |
| |
| int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) |
| { |
| int err = 0; |
| struct ip_mreqn imr; |
| __be32 addr = msf->imsf_multiaddr; |
| struct ip_mc_socklist *pmc; |
| struct in_device *in_dev; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ip_sf_socklist *newpsl, *psl; |
| struct net *net = sock_net(sk); |
| int leavegroup = 0; |
| |
| if (!ipv4_is_multicast(addr)) |
| return -EINVAL; |
| if (msf->imsf_fmode != MCAST_INCLUDE && |
| msf->imsf_fmode != MCAST_EXCLUDE) |
| return -EINVAL; |
| |
| ASSERT_RTNL(); |
| |
| imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
| imr.imr_address.s_addr = msf->imsf_interface; |
| imr.imr_ifindex = ifindex; |
| in_dev = ip_mc_find_dev(net, &imr); |
| |
| if (!in_dev) { |
| err = -ENODEV; |
| goto done; |
| } |
| |
| /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
| if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { |
| leavegroup = 1; |
| goto done; |
| } |
| |
| for_each_pmc_rtnl(inet, pmc) { |
| if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
| pmc->multi.imr_ifindex == imr.imr_ifindex) |
| break; |
| } |
| if (!pmc) { /* must have a prior join */ |
| err = -EINVAL; |
| goto done; |
| } |
| if (msf->imsf_numsrc) { |
| newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
| GFP_KERNEL); |
| if (!newpsl) { |
| err = -ENOBUFS; |
| goto done; |
| } |
| newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; |
| memcpy(newpsl->sl_addr, msf->imsf_slist, |
| msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); |
| err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
| msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); |
| if (err) { |
| sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); |
| goto done; |
| } |
| } else { |
| newpsl = NULL; |
| (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
| msf->imsf_fmode, 0, NULL, 0); |
| } |
| psl = rtnl_dereference(pmc->sflist); |
| if (psl) { |
| (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, |
| psl->sl_count, psl->sl_addr, 0); |
| /* decrease mem now to avoid the memleak warning */ |
| atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); |
| kfree_rcu(psl, rcu); |
| } else |
| (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, |
| 0, NULL, 0); |
| rcu_assign_pointer(pmc->sflist, newpsl); |
| pmc->sfmode = msf->imsf_fmode; |
| err = 0; |
| done: |
| if (leavegroup) |
| err = ip_mc_leave_group(sk, &imr); |
| return err; |
| } |
| |
| int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, |
| struct ip_msfilter __user *optval, int __user *optlen) |
| { |
| int err, len, count, copycount; |
| struct ip_mreqn imr; |
| __be32 addr = msf->imsf_multiaddr; |
| struct ip_mc_socklist *pmc; |
| struct in_device *in_dev; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ip_sf_socklist *psl; |
| struct net *net = sock_net(sk); |
| |
| ASSERT_RTNL(); |
| |
| if (!ipv4_is_multicast(addr)) |
| return -EINVAL; |
| |
| imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
| imr.imr_address.s_addr = msf->imsf_interface; |
| imr.imr_ifindex = 0; |
| in_dev = ip_mc_find_dev(net, &imr); |
| |
| if (!in_dev) { |
| err = -ENODEV; |
| goto done; |
| } |
| err = -EADDRNOTAVAIL; |
| |
| for_each_pmc_rtnl(inet, pmc) { |
| if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
| pmc->multi.imr_ifindex == imr.imr_ifindex) |
| break; |
| } |
| if (!pmc) /* must have a prior join */ |
| goto done; |
| msf->imsf_fmode = pmc->sfmode; |
| psl = rtnl_dereference(pmc->sflist); |
| if (!psl) { |
| len = 0; |
| count = 0; |
| } else { |
| count = psl->sl_count; |
| } |
| copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; |
| len = copycount * sizeof(psl->sl_addr[0]); |
| msf->imsf_numsrc = count; |
| if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || |
| copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { |
| return -EFAULT; |
| } |
| if (len && |
| copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) |
| return -EFAULT; |
| return 0; |
| done: |
| return err; |
| } |
| |
| int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, |
| struct group_filter __user *optval, int __user *optlen) |
| { |
| int err, 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; |
| |
| err = -EADDRNOTAVAIL; |
| |
| 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 */ |
| goto done; |
| 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; |
| if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || |
| copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { |
| return -EFAULT; |
| } |
| for (i = 0; i < copycount; i++) { |
| 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(&optval->gf_slist[i], &ss, sizeof(ss))) |
| return -EFAULT; |
| } |
| return 0; |
| done: |
| return err; |
| } |
| |
| /* |
| * check if a multicast source filter allows delivery for a given <src,dst,intf> |
| */ |
| int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, |
| int dif, int sdif) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct ip_mc_socklist *pmc; |
| struct ip_sf_socklist *psl; |
| int i; |
| int ret; |
| |
| ret = 1; |
| if (!ipv4_is_multicast(loc_addr)) |
| goto out; |
| |
| rcu_read_lock(); |
| for_each_pmc_rcu(inet, pmc) { |
| if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
| (pmc->multi.imr_ifindex == dif || |
| (sdif && pmc->multi.imr_ifindex == sdif))) |
| break; |
| } |
| ret = inet->mc_all; |
| if (!pmc) |
| goto unlock; |
| psl = rcu_dereference(pmc->sflist); |
| ret = (pmc->sfmode == MCAST_EXCLUDE); |
| if (!psl) |
| goto unlock; |
| |
| for (i = 0; i < psl->sl_count; i++) { |
| if (psl->sl_addr[i] == rmt_addr) |
| break; |
| } |
| ret = 0; |
| if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
| goto unlock; |
| if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
| goto unlock; |
| ret = 1; |
| unlock: |
| rcu_read_unlock(); |
| out: |
| return ret; |
| } |
| |
| /* |
| * A socket is closing. |
| */ |
| |
| void ip_mc_drop_socket(struct sock *sk) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct ip_mc_socklist *iml; |
| struct net *net = sock_net(sk); |
| |
| if (!inet->mc_list) |
| return; |
| |
| rtnl_lock(); |
| while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
| struct in_device *in_dev; |
| |
| inet->mc_list = iml->next_rcu; |
| in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
| (void) ip_mc_leave_src(sk, iml, in_dev); |
| if (in_dev) |
| ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
| /* decrease mem now to avoid the memleak warning */ |
| atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); |
| kfree_rcu(iml, rcu); |
| } |
| rtnl_unlock(); |
| } |
| |
| /* called with rcu_read_lock() */ |
| int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
| { |
| struct ip_mc_list *im; |
| struct ip_mc_list __rcu **mc_hash; |
| struct ip_sf_list *psf; |
| int rv = 0; |
| |
| mc_hash = rcu_dereference(in_dev->mc_hash); |
| if (mc_hash) { |
| u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
| |
| for (im = rcu_dereference(mc_hash[hash]); |
| im != NULL; |
| im = rcu_dereference(im->next_hash)) { |
| if (im->multiaddr == mc_addr) |
| break; |
| } |
| } else { |
| for_each_pmc_rcu(in_dev, im) { |
| if (im->multiaddr == mc_addr) |
| break; |
| } |
| } |
| if (im && proto == IPPROTO_IGMP) { |
| rv = 1; |
| } else if (im) { |
| if (src_addr) { |
| for (psf = im->sources; psf; psf = psf->sf_next) { |
| if (psf->sf_inaddr == src_addr) |
| break; |
| } |
| if (psf) |
| rv = psf->sf_count[MCAST_INCLUDE] || |
| psf->sf_count[MCAST_EXCLUDE] != |
| im->sfcount[MCAST_EXCLUDE]; |
| else |
| rv = im->sfcount[MCAST_EXCLUDE] != 0; |
| } else |
| rv = 1; /* unspecified source; tentatively allow */ |
| } |
| return rv; |
| } |
| |
| #if defined(CONFIG_PROC_FS) |
| struct igmp_mc_iter_state { |
| struct seq_net_private p; |
| struct net_device *dev; |
| struct in_device *in_dev; |
| }; |
| |
| #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) |
| |
| static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) |
| { |
| struct net *net = seq_file_net(seq); |
| struct ip_mc_list *im = NULL; |
| struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
| |
| state->in_dev = NULL; |
| for_each_netdev_rcu(net, state->dev) { |
| struct in_device *in_dev; |
| |
| in_dev = __in_dev_get_rcu(state->dev); |
| if (!in_dev) |
| continue; |
| im = rcu_dereference(in_dev->mc_list); |
| if (im) { |
| state->in_dev = in_dev; |
| break; |
| } |
| } |
| return im; |
| } |
| |
| static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) |
| { |
| struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
| |
| im = rcu_dereference(im->next_rcu); |
| while (!im) { |
| state->dev = next_net_device_rcu(state->dev); |
| if (!state->dev) { |
| state->in_dev = NULL; |
| break; |
| } |
| state->in_dev = __in_dev_get_rcu(state->dev); |
| if (!state->in_dev) |
| continue; |
| im = rcu_dereference(state->in_dev->mc_list); |
| } |
| return im; |
| } |
| |
| static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) |
| { |
| struct ip_mc_list *im = igmp_mc_get_first(seq); |
| if (im) |
| while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) |
| --pos; |
| return pos ? NULL : im; |
| } |
| |
| static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(rcu) |
| { |
| rcu_read_lock(); |
| return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| } |
| |
| static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct ip_mc_list *im; |
| if (v == SEQ_START_TOKEN) |
| im = igmp_mc_get_first(seq); |
| else |
| im = igmp_mc_get_next(seq, v); |
| ++*pos; |
| return im; |
| } |
| |
| static void igmp_mc_seq_stop(struct seq_file *seq, void *v) |
| __releases(rcu) |
| { |
| struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
| |
| state->in_dev = NULL; |
| state->dev = NULL; |
| rcu_read_unlock(); |
| } |
| |
| static int igmp_mc_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) |
| seq_puts(seq, |
| "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
| else { |
| struct ip_mc_list *im = (struct ip_mc_list *)v; |
| struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
| char *querier; |
| long delta; |
| |
| #ifdef CONFIG_IP_MULTICAST |
| querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : |
| IGMP_V2_SEEN(state->in_dev) ? "V2" : |
| "V3"; |
| #else |
| querier = "NONE"; |
| #endif |
| |
| if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
| seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
| state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
| } |
| |
| delta = im->timer.expires - jiffies; |
| seq_printf(seq, |
| "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
| im->multiaddr, im->users, |
| im->tm_running, |
| im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, |
| im->reporter); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations igmp_mc_seq_ops = { |
| .start = igmp_mc_seq_start, |
| .next = igmp_mc_seq_next, |
| .stop = igmp_mc_seq_stop, |
| .show = igmp_mc_seq_show, |
| }; |
| |
| struct igmp_mcf_iter_state { |
| struct seq_net_private p; |
| struct net_device *dev; |
| struct in_device *idev; |
| struct ip_mc_list *im; |
| }; |
| |
| #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) |
| |
| static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) |
| { |
| struct net *net = seq_file_net(seq); |
| struct ip_sf_list *psf = NULL; |
| struct ip_mc_list *im = NULL; |
| struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
| |
| state->idev = NULL; |
| state->im = NULL; |
| for_each_netdev_rcu(net, state->dev) { |
| struct in_device *idev; |
| idev = __in_dev_get_rcu(state->dev); |
| if (unlikely(!idev)) |
| continue; |
| im = rcu_dereference(idev->mc_list); |
| if (likely(im)) { |
| spin_lock_bh(&im->lock); |
| psf = im->sources; |
| if (likely(psf)) { |
| state->im = im; |
| state->idev = idev; |
| break; |
| } |
| spin_unlock_bh(&im->lock); |
| } |
| } |
| return psf; |
| } |
| |
| static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) |
| { |
| struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
| |
| psf = psf->sf_next; |
| while (!psf) { |
| spin_unlock_bh(&state->im->lock); |
| state->im = state->im->next; |
| while (!state->im) { |
| state->dev = next_net_device_rcu(state->dev); |
| if (!state->dev) { |
| state->idev = NULL; |
| goto out; |
| } |
| state->idev = __in_dev_get_rcu(state->dev); |
| if (!state->idev) |
| continue; |
| state->im = rcu_dereference(state->idev->mc_list); |
| } |
| if (!state->im) |
| break; |
| spin_lock_bh(&state->im->lock); |
| psf = state->im->sources; |
| } |
| out: |
| return psf; |
| } |
| |
| static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) |
| { |
| struct ip_sf_list *psf = igmp_mcf_get_first(seq); |
| if (psf) |
| while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) |
| --pos; |
| return pos ? NULL : psf; |
| } |
| |
| static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(rcu) |
| { |
| rcu_read_lock(); |
| return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| } |
| |
| static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct ip_sf_list *psf; |
| if (v == SEQ_START_TOKEN) |
| psf = igmp_mcf_get_first(seq); |
| else |
| psf = igmp_mcf_get_next(seq, v); |
| ++*pos; |
| return psf; |
| } |
| |
| static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) |
| __releases(rcu) |
| { |
| struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
| if (likely(state->im)) { |
| spin_unlock_bh(&state->im->lock); |
| state->im = NULL; |
| } |
| state->idev = NULL; |
| state->dev = NULL; |
| rcu_read_unlock(); |
| } |
| |
| static int igmp_mcf_seq_show(struct seq_file *seq, void *v) |
| { |
| struct ip_sf_list *psf = (struct ip_sf_list *)v; |
| struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
| |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
| } else { |
| seq_printf(seq, |
| "%3d %6.6s 0x%08x " |
| "0x%08x %6lu %6lu\n", |
| state->dev->ifindex, state->dev->name, |
| ntohl(state->im->multiaddr), |
| ntohl(psf->sf_inaddr), |
| psf->sf_count[MCAST_INCLUDE], |
| psf->sf_count[MCAST_EXCLUDE]); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations igmp_mcf_seq_ops = { |
| .start = igmp_mcf_seq_start, |
| .next = igmp_mcf_seq_next, |
| .stop = igmp_mcf_seq_stop, |
| .show = igmp_mcf_seq_show, |
| }; |
| |
| static int __net_init igmp_net_init(struct net *net) |
| { |
| struct proc_dir_entry *pde; |
| int err; |
| |
| pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, |
| sizeof(struct igmp_mc_iter_state)); |
| if (!pde) |
| goto out_igmp; |
| pde = proc_create_net("mcfilter", 0444, net->proc_net, |
| &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); |
| if (!pde) |
| goto out_mcfilter; |
| err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
| SOCK_DGRAM, 0, net); |
| if (err < 0) { |
| pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", |
| err); |
| goto out_sock; |
| } |
| |
| return 0; |
| |
| out_sock: |
| remove_proc_entry("mcfilter", net->proc_net); |
| out_mcfilter: |
| remove_proc_entry("igmp", net->proc_net); |
| out_igmp: |
| return -ENOMEM; |
| } |
| |
| static void __net_exit igmp_net_exit(struct net *net) |
| { |
| remove_proc_entry("mcfilter", net->proc_net); |
| remove_proc_entry("igmp", net->proc_net); |
| inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
| } |
| |
| static struct pernet_operations igmp_net_ops = { |
| .init = igmp_net_init, |
| .exit = igmp_net_exit, |
| }; |
| #endif |
| |
| static int igmp_netdev_event(struct notifier_block *this, |
| unsigned long event, void *ptr) |
| { |
| struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| struct in_device *in_dev; |
| |
| switch (event) { |
| case NETDEV_RESEND_IGMP: |
| in_dev = __in_dev_get_rtnl(dev); |
| if (in_dev) |
| ip_mc_rejoin_groups(in_dev); |
| break; |
| default: |
| break; |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block igmp_notifier = { |
| .notifier_call = igmp_netdev_event, |
| }; |
| |
| int __init igmp_mc_init(void) |
| { |
| #if defined(CONFIG_PROC_FS) |
| int err; |
| |
| err = register_pernet_subsys(&igmp_net_ops); |
| if (err) |
| return err; |
| err = register_netdevice_notifier(&igmp_notifier); |
| if (err) |
| goto reg_notif_fail; |
| return 0; |
| |
| reg_notif_fail: |
| unregister_pernet_subsys(&igmp_net_ops); |
| return err; |
| #else |
| return register_netdevice_notifier(&igmp_notifier); |
| #endif |
| } |