/* * 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. * * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $ * * Authors: * Alan Cox <Alan.Cox@linux.org> * * 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/config.h> #include <linux/module.h> #include <asm/uaccess.h> #include <asm/system.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 <net/ip.h> #include <net/protocol.h> #include <net/route.h> #include <net/sock.h> #include <net/checksum.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 #define IP_MAX_MEMBERSHIPS 20 #define IP_MAX_MSF 10 #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_Unsolicited_Report_Interval (10*HZ) #define IGMP_Query_Response_Interval (10*HZ) #define IGMP_Unsolicited_Report_Count 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.force_igmp_version == 1 || \ (in_dev)->cnf.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.force_igmp_version == 2 || \ (in_dev)->cnf.force_igmp_version == 2 || \ ((in_dev)->mr_v2_seen && \ time_before(jiffies, (in_dev)->mr_v2_seen))) 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, __u32 multiaddr); 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, __u32 *pmca, int sfmode, int sfcount, __u32 *psfsrc, int delta); static void ip_ma_put(struct ip_mc_list *im) { if (atomic_dec_and_test(&im->refcnt)) { in_dev_put(im->interface); kfree(im); } } #ifdef CONFIG_IP_MULTICAST /* * Timer management */ static __inline__ void igmp_stop_timer(struct ip_mc_list *im) { spin_lock_bh(&im->lock); if (del_timer(&im->timer)) atomic_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=net_random() % max_delay; im->tm_running=1; if (!mod_timer(&im->timer, jiffies+tv+2)) atomic_inc(&im->refcnt); } static void igmp_gq_start_timer(struct in_device *in_dev) { int tv = net_random() % in_dev->mr_maxdelay; in_dev->mr_gq_running = 1; if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) in_dev_hold(in_dev); } static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) { int tv = net_random() % 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; } atomic_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; return !(pmc->gsquery && !psf->sf_gsresp); 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; } static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) { struct sk_buff *skb; struct rtable *rt; struct iphdr *pip; struct igmpv3_report *pig; skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); if (skb == NULL) return NULL; { struct flowi fl = { .oif = dev->ifindex, .nl_u = { .ip4_u = { .daddr = IGMPV3_ALL_MCR } }, .proto = IPPROTO_IGMP }; if (ip_route_output_key(&rt, &fl)) { kfree_skb(skb); return NULL; } } if (rt->rt_src == 0) { kfree_skb(skb); ip_rt_put(rt); return NULL; } skb->dst = &rt->u.dst; skb->dev = dev; skb_reserve(skb, LL_RESERVED_SPACE(dev)); skb->nh.iph = pip =(struct iphdr *)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 = rt->rt_dst; pip->saddr = rt->rt_src; pip->protocol = IPPROTO_IGMP; pip->tot_len = 0; /* filled in later */ ip_select_ident(pip, &rt->u.dst, NULL); ((u8*)&pip[1])[0] = IPOPT_RA; ((u8*)&pip[1])[1] = 4; ((u8*)&pip[1])[2] = 0; ((u8*)&pip[1])[3] = 0; pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig)); skb->h.igmph = (struct igmphdr *)pig; 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 iphdr *pip = skb->nh.iph; struct igmphdr *pig = skb->h.igmph; int iplen, igmplen; iplen = skb->tail - (unsigned char *)skb->nh.iph; pip->tot_len = htons(iplen); ip_send_check(pip); igmplen = skb->tail - (unsigned char *)skb->h.igmph; pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen); return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, dst_output); } 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) { struct net_device *dev = pmc->interface->dev; struct igmpv3_report *pih; struct igmpv3_grec *pgr; if (!skb) skb = igmpv3_newpack(dev, dev->mtu); if (!skb) return NULL; pgr = (struct igmpv3_grec *)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 = (struct igmpv3_report *)skb->h.igmph; pih->ngrec = htons(ntohs(pih->ngrec)+1); *ppgr = pgr; return skb; } #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ skb_tailroom(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 igmpv3_report *pih; struct igmpv3_grec *pgr = NULL; struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; int scount, first, isquery, truncate; if (pmc->multiaddr == IGMP_ALL_HOSTS) return skb; isquery = type == IGMPV3_MODE_IS_INCLUDE || type == IGMPV3_MODE_IS_EXCLUDE; truncate = type == IGMPV3_MODE_IS_EXCLUDE || type == IGMPV3_CHANGE_TO_EXCLUDE; psf_list = sdeleted ? &pmc->tomb : &pmc->sources; if (!*psf_list) { 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 and at * least one source. */ if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+ sizeof(__u32)) { igmpv3_sendpack(skb); skb = NULL; /* add_grhead will get a new one */ } skb = add_grhead(skb, pmc, type, &pgr); } return skb; } pih = skb ? (struct igmpv3_report *)skb->h.igmph : 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, dev->mtu); } } first = 1; scount = 0; psf_prev = NULL; for (psf=*psf_list; psf; psf=psf_next) { u32 *psrc; psf_next = psf->sf_next; if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { psf_prev = psf; continue; } /* clear marks on query responses */ if (isquery) psf->sf_gsresp = 0; if (AVAILABLE(skb) < sizeof(u32) + 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, dev->mtu); first = 1; scount = 0; } if (first) { skb = add_grhead(skb, pmc, type, &pgr); first = 0; } psrc = (u32 *)skb_put(skb, sizeof(u32)); *psrc = psf->sf_inaddr; scount++; if ((type == IGMPV3_ALLOW_NEW_SOURCES || type == IGMPV3_BLOCK_OLD_SOURCES) && psf->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; } 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; int type; if (!pmc) { read_lock(&in_dev->mc_list_lock); for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { if (pmc->multiaddr == IGMP_ALL_HOSTS) 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); } read_unlock(&in_dev->mc_list_lock); } 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; read_lock(&in_dev->mc_list_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) { pmc->crcount--; if (pmc->sfmode == MCAST_EXCLUDE) { type = IGMPV3_CHANGE_TO_INCLUDE; skb = add_grec(skb, pmc, type, 1, 0); } 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 (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 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) { 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); } spin_unlock_bh(&pmc->lock); } read_unlock(&in_dev->mc_list_lock); 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; u32 group = pmc ? pmc->multiaddr : 0; u32 dst; if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) return igmpv3_send_report(in_dev, pmc); else if (type == IGMP_HOST_LEAVE_MESSAGE) dst = IGMP_ALL_ROUTER; else dst = group; { struct flowi fl = { .oif = dev->ifindex, .nl_u = { .ip4_u = { .daddr = dst } }, .proto = IPPROTO_IGMP }; if (ip_route_output_key(&rt, &fl)) return -1; } if (rt->rt_src == 0) { ip_rt_put(rt); return -1; } skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); if (skb == NULL) { ip_rt_put(rt); return -1; } skb->dst = &rt->u.dst; skb_reserve(skb, LL_RESERVED_SPACE(dev)); skb->nh.iph = iph = (struct iphdr *)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 = rt->rt_src; iph->protocol = IPPROTO_IGMP; iph->tot_len = htons(IGMP_SIZE); ip_select_ident(iph, &rt->u.dst, NULL); ((u8*)&iph[1])[0] = IPOPT_RA; ((u8*)&iph[1])[1] = 4; ((u8*)&iph[1])[2] = 0; ((u8*)&iph[1])[3] = 0; ip_send_check(iph); ih = (struct igmphdr *)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 NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, dst_output); } static void igmp_gq_timer_expire(unsigned long data) { struct in_device *in_dev = (struct in_device *)data; in_dev->mr_gq_running = 0; igmpv3_send_report(in_dev, NULL); __in_dev_put(in_dev); } static void igmp_ifc_timer_expire(unsigned long data) { struct in_device *in_dev = (struct in_device *)data; igmpv3_send_cr(in_dev); if (in_dev->mr_ifc_count) { in_dev->mr_ifc_count--; igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); } __in_dev_put(in_dev); } static void igmp_ifc_event(struct in_device *in_dev) { if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) return; in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; igmp_ifc_start_timer(in_dev, 1); } static void igmp_timer_expire(unsigned long data) { struct ip_mc_list *im=(struct ip_mc_list *)data; 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, IGMP_Unsolicited_Report_Interval); } 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); } static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *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++) if (srcs[i] == psf->sf_inaddr) { psf->sf_gsresp = 1; scount++; break; } } } static void igmp_heard_report(struct in_device *in_dev, u32 group) { struct ip_mc_list *im; /* Timers are only set for non-local groups */ if (group == IGMP_ALL_HOSTS) return; read_lock(&in_dev->mc_list_lock); for (im=in_dev->mc_list; im!=NULL; im=im->next) { if (im->multiaddr == group) { igmp_stop_timer(im); break; } } read_unlock(&in_dev->mc_list_lock); } static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, int len) { struct igmphdr *ih = skb->h.igmph; struct igmpv3_query *ih3 = (struct igmpv3_query *)ih; struct ip_mc_list *im; u32 group = ih->group; int max_delay; int mark = 0; 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; /* ignore bogus packet; freed by caller */ } else { /* v3 */ if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) return; ih3 = (struct igmpv3_query *) skb->h.raw; if (ih3->nsrcs) { if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) + ntohs(ih3->nsrcs)*sizeof(__u32))) return; ih3 = (struct igmpv3_query *) skb->h.raw; } 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; /* no sources allowed */ igmp_gq_start_timer(in_dev); return; } /* 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 */ read_lock(&in_dev->mc_list_lock); for (im=in_dev->mc_list; im!=NULL; im=im->next) { if (group && group != im->multiaddr) continue; if (im->multiaddr == IGMP_ALL_HOSTS) continue; spin_lock_bh(&im->lock); if (im->tm_running) im->gsquery = im->gsquery && mark; else im->gsquery = mark; if (im->gsquery) igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); spin_unlock_bh(&im->lock); igmp_mod_timer(im, max_delay); } read_unlock(&in_dev->mc_list_lock); } int igmp_rcv(struct sk_buff *skb) { /* This basically follows the spec line by line -- see RFC1112 */ struct igmphdr *ih; struct in_device *in_dev = in_dev_get(skb->dev); int len = skb->len; if (in_dev==NULL) { kfree_skb(skb); return 0; } if (!pskb_may_pull(skb, sizeof(struct igmphdr)) || (u16)csum_fold(skb_checksum(skb, 0, len, 0))) { in_dev_put(in_dev); kfree_skb(skb); return 0; } ih = skb->h.igmph; switch (ih->type) { case IGMP_HOST_MEMBERSHIP_QUERY: igmp_heard_query(in_dev, skb, len); break; case IGMP_HOST_MEMBERSHIP_REPORT: case IGMPV2_HOST_MEMBERSHIP_REPORT: case IGMPV3_HOST_MEMBERSHIP_REPORT: /* Is it our report looped back? */ if (((struct rtable*)skb->dst)->fl.iif == 0) break; igmp_heard_report(in_dev, ih->group); break; case IGMP_PIM: #ifdef CONFIG_IP_PIMSM_V1 in_dev_put(in_dev); return pim_rcv_v1(skb); #endif case IGMP_DVMRP: case IGMP_TRACE: case IGMP_HOST_LEAVE_MESSAGE: case IGMP_MTRACE: case IGMP_MTRACE_RESP: break; default: NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type)); } in_dev_put(in_dev); kfree_skb(skb); return 0; } #endif /* * Add a filter to a device */ static void ip_mc_filter_add(struct in_device *in_dev, u32 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 dev->set_multicast_list 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,dev->addr_len,0); } /* * Remove a filter from a device */ static void ip_mc_filter_del(struct in_device *in_dev, u32 addr) { char buf[MAX_ADDR_LEN]; struct net_device *dev = in_dev->dev; if (arp_mc_map(addr, buf, dev, 0) == 0) dev_mc_delete(dev,buf,dev->addr_len,0); } #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; /* 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 = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL); if (!pmc) return; memset(pmc, 0, sizeof(*pmc)); spin_lock_bh(&im->lock); pmc->interface = im->interface; in_dev_hold(in_dev); pmc->multiaddr = im->multiaddr; pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; 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); } static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr) { struct ip_mc_list *pmc, *pmc_prev; struct ip_sf_list *psf, *psf_next; 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); if (pmc) { for (psf=pmc->tomb; psf; psf=psf_next) { psf_next = psf->sf_next; kfree(psf); } in_dev_put(pmc->interface); kfree(pmc); } } 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 */ read_lock(&in_dev->mc_list_lock); for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 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); } } read_unlock(&in_dev->mc_list_lock); } #endif static void igmp_group_dropped(struct ip_mc_list *im) { struct in_device *in_dev = im->interface; #ifdef CONFIG_IP_MULTICAST 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; reporter = im->reporter; igmp_stop_timer(im); if (!in_dev->dead) { if (IGMP_V1_SEEN(in_dev)) goto done; if (IGMP_V2_SEEN(in_dev)) { if (reporter) igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); goto done; } /* IGMPv3 */ igmpv3_add_delrec(in_dev, im); igmp_ifc_event(in_dev); } done: #endif ip_mc_clear_src(im); } static void igmp_group_added(struct ip_mc_list *im) { struct in_device *in_dev = im->interface; 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 (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 */ im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; igmp_ifc_event(in_dev); #endif } /* * Multicast list managers */ /* * A socket has joined a multicast group on device dev. */ void ip_mc_inc_group(struct in_device *in_dev, u32 addr) { struct ip_mc_list *im; ASSERT_RTNL(); for (im=in_dev->mc_list; im; im=im->next) { if (im->multiaddr == addr) { im->users++; ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); goto out; } } im = (struct ip_mc_list *)kmalloc(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 = MCAST_EXCLUDE; im->sfcount[MCAST_INCLUDE] = 0; im->sfcount[MCAST_EXCLUDE] = 1; im->sources = NULL; im->tomb = NULL; im->crcount = 0; atomic_set(&im->refcnt, 1); spin_lock_init(&im->lock); #ifdef CONFIG_IP_MULTICAST im->tm_running=0; init_timer(&im->timer); im->timer.data=(unsigned long)im; im->timer.function=&igmp_timer_expire; im->unsolicit_count = IGMP_Unsolicited_Report_Count; im->reporter = 0; im->gsquery = 0; #endif im->loaded = 0; write_lock_bh(&in_dev->mc_list_lock); im->next=in_dev->mc_list; in_dev->mc_list=im; write_unlock_bh(&in_dev->mc_list_lock); #ifdef CONFIG_IP_MULTICAST igmpv3_del_delrec(in_dev, im->multiaddr); #endif igmp_group_added(im); if (!in_dev->dead) ip_rt_multicast_event(in_dev); out: return; } /* * A socket has left a multicast group on device dev */ void ip_mc_dec_group(struct in_device *in_dev, u32 addr) { struct ip_mc_list *i, **ip; ASSERT_RTNL(); for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { if (i->multiaddr==addr) { if (--i->users == 0) { write_lock_bh(&in_dev->mc_list_lock); *ip = i->next; write_unlock_bh(&in_dev->mc_list_lock); igmp_group_dropped(i); if (!in_dev->dead) ip_rt_multicast_event(in_dev); ip_ma_put(i); return; } break; } } } /* Device going down */ void ip_mc_down(struct in_device *in_dev) { struct ip_mc_list *i; ASSERT_RTNL(); for (i=in_dev->mc_list; i; i=i->next) igmp_group_dropped(i); #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); igmpv3_clear_delrec(in_dev); #endif ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); } void ip_mc_init_dev(struct in_device *in_dev) { ASSERT_RTNL(); in_dev->mc_tomb = NULL; #ifdef CONFIG_IP_MULTICAST in_dev->mr_gq_running = 0; init_timer(&in_dev->mr_gq_timer); in_dev->mr_gq_timer.data=(unsigned long) in_dev; in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; in_dev->mr_ifc_count = 0; init_timer(&in_dev->mr_ifc_timer); in_dev->mr_ifc_timer.data=(unsigned long) in_dev; in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; #endif rwlock_init(&in_dev->mc_list_lock); spin_lock_init(&in_dev->mc_tomb_lock); } /* Device going up */ void ip_mc_up(struct in_device *in_dev) { struct ip_mc_list *i; ASSERT_RTNL(); ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); for (i=in_dev->mc_list; i; i=i->next) igmp_group_added(i); } /* * 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); write_lock_bh(&in_dev->mc_list_lock); while ((i = in_dev->mc_list) != NULL) { in_dev->mc_list = i->next; write_unlock_bh(&in_dev->mc_list_lock); igmp_group_dropped(i); ip_ma_put(i); write_lock_bh(&in_dev->mc_list_lock); } write_unlock_bh(&in_dev->mc_list_lock); } static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) { struct flowi fl = { .nl_u = { .ip4_u = { .daddr = imr->imr_multiaddr.s_addr } } }; struct rtable *rt; struct net_device *dev = NULL; struct in_device *idev = NULL; if (imr->imr_ifindex) { idev = inetdev_by_index(imr->imr_ifindex); if (idev) __in_dev_put(idev); return idev; } if (imr->imr_address.s_addr) { dev = ip_dev_find(imr->imr_address.s_addr); if (!dev) return NULL; __dev_put(dev); } if (!dev && !ip_route_output_key(&rt, &fl)) { dev = rt->u.dst.dev; ip_rt_put(rt); } if (dev) { imr->imr_ifindex = dev->ifindex; idev = __in_dev_get(dev); } return idev; } /* * Join a socket to a group */ int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS; int sysctl_igmp_max_msf = IP_MAX_MSF; static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, __u32 *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; #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 ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; 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, __u32 *pmca, int sfmode, int sfcount, __u32 *psfsrc, int delta) { struct ip_mc_list *pmc; int changerec = 0; int i, err; if (!in_dev) return -ENODEV; read_lock(&in_dev->mc_list_lock); for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { if (*pmca == pmc->multiaddr) break; } if (!pmc) { /* MCA not found?? bug */ read_unlock(&in_dev->mc_list_lock); return -ESRCH; } spin_lock_bh(&pmc->lock); read_unlock(&in_dev->mc_list_lock); #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; #endif /* filter mode change */ pmc->sfmode = MCAST_INCLUDE; #ifdef CONFIG_IP_MULTICAST pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; 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, __u32 *psfsrc, int delta) { 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 = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); if (!psf) return -ENOBUFS; memset(psf, 0, sizeof(*psf)); 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; 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 != psf->sf_oldin) { psf->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, __u32 *pmca, int sfmode, int sfcount, __u32 *psfsrc, int delta) { struct ip_mc_list *pmc; int isexclude; int i, err; if (!in_dev) return -ENODEV; read_lock(&in_dev->mc_list_lock); for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { if (*pmca == pmc->multiaddr) break; } if (!pmc) { /* MCA not found?? bug */ read_unlock(&in_dev->mc_list_lock); return -ESRCH; } spin_lock_bh(&pmc->lock); read_unlock(&in_dev->mc_list_lock); #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], delta); if (err) break; } if (err) { int j; pmc->sfcount[sfmode]--; for (j=0; j<i; j++) (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { #ifdef CONFIG_IP_MULTICAST struct in_device *in_dev = pmc->interface; struct ip_sf_list *psf; #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 ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; 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; for (psf=pmc->tomb; psf; psf=nextpsf) { nextpsf = psf->sf_next; kfree(psf); } pmc->tomb = NULL; for (psf=pmc->sources; psf; psf=nextpsf) { nextpsf = psf->sf_next; kfree(psf); } pmc->sources = NULL; pmc->sfmode = MCAST_EXCLUDE; pmc->sfcount[MCAST_EXCLUDE] = 0; pmc->sfcount[MCAST_EXCLUDE] = 1; } /* * Join a multicast group */ int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) { int err; u32 addr = imr->imr_multiaddr.s_addr; struct ip_mc_socklist *iml=NULL, *i; struct in_device *in_dev; struct inet_sock *inet = inet_sk(sk); int ifindex; int count = 0; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); in_dev = ip_mc_find_dev(imr); if (!in_dev) { iml = NULL; err = -ENODEV; goto done; } err = -EADDRINUSE; ifindex = imr->imr_ifindex; for (i = inet->mc_list; i; i = i->next) { if (i->multi.imr_multiaddr.s_addr == addr && i->multi.imr_ifindex == ifindex) goto done; count++; } err = -ENOBUFS; if (count >= sysctl_igmp_max_memberships) goto done; iml = (struct ip_mc_socklist *)sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); if (iml == NULL) goto done; memcpy(&iml->multi, imr, sizeof(*imr)); iml->next = inet->mc_list; iml->sflist = NULL; iml->sfmode = MCAST_EXCLUDE; inet->mc_list = iml; ip_mc_inc_group(in_dev, addr); err = 0; done: rtnl_shunlock(); return err; } static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, struct in_device *in_dev) { int err; if (iml->sflist == 0) { /* 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, iml->sflist->sl_count, iml->sflist->sl_addr, 0); sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); iml->sflist = NULL; return err; } /* * Ask a socket to leave a group. */ int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) { struct inet_sock *inet = inet_sk(sk); struct ip_mc_socklist *iml, **imlp; struct in_device *in_dev; u32 group = imr->imr_multiaddr.s_addr; u32 ifindex; rtnl_lock(); in_dev = ip_mc_find_dev(imr); if (!in_dev) { rtnl_unlock(); return -ENODEV; } ifindex = imr->imr_ifindex; for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { if (iml->multi.imr_multiaddr.s_addr == group && iml->multi.imr_ifindex == ifindex) { (void) ip_mc_leave_src(sk, iml, in_dev); *imlp = iml->next; ip_mc_dec_group(in_dev, group); rtnl_unlock(); sock_kfree_s(sk, iml, sizeof(*iml)); return 0; } } rtnl_unlock(); return -EADDRNOTAVAIL; } int ip_mc_source(int add, int omode, struct sock *sk, struct ip_mreq_source *mreqs, int ifindex) { int err; struct ip_mreqn imr; u32 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; int leavegroup = 0; int i, j, rv; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); 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(&imr); if (!in_dev) { err = -ENODEV; goto done; } err = -EADDRNOTAVAIL; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 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 = 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(__u32)); 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 >= 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 = (struct ip_sf_socklist *)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]; sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); } pmc->sflist = 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(__u32)); 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: rtnl_shunlock(); if (leavegroup) return 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; u32 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; int leavegroup = 0; if (!MULTICAST(addr)) return -EINVAL; if (msf->imsf_fmode != MCAST_INCLUDE && msf->imsf_fmode != MCAST_EXCLUDE) return -EINVAL; rtnl_shlock(); 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(&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 (pmc=inet->mc_list; pmc; pmc=pmc->next) { 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 = (struct ip_sf_socklist *)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; psl = pmc->sflist; if (psl) { (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, psl->sl_count, psl->sl_addr, 0); sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); } else (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 0, NULL, 0); pmc->sflist = newpsl; pmc->sfmode = msf->imsf_fmode; err = 0; done: rtnl_shunlock(); 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; u32 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; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); 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(&imr); if (!in_dev) { err = -ENODEV; goto done; } err = -EADDRNOTAVAIL; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 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 = pmc->sflist; rtnl_shunlock(); 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: rtnl_shunlock(); 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; u32 addr; struct ip_mc_socklist *pmc; struct inet_sock *inet = inet_sk(sk); struct ip_sf_socklist *psl; psin = (struct sockaddr_in *)&gsf->gf_group; if (psin->sin_family != AF_INET) return -EINVAL; addr = psin->sin_addr.s_addr; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); err = -EADDRNOTAVAIL; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 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 = pmc->sflist; rtnl_shunlock(); 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_in *psin; 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: rtnl_shunlock(); return err; } /* * check if a multicast source filter allows delivery for a given <src,dst,intf> */ int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif) { struct inet_sock *inet = inet_sk(sk); struct ip_mc_socklist *pmc; struct ip_sf_socklist *psl; int i; if (!MULTICAST(loc_addr)) return 1; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { if (pmc->multi.imr_multiaddr.s_addr == loc_addr && pmc->multi.imr_ifindex == dif) break; } if (!pmc) return 1; psl = pmc->sflist; if (!psl) return pmc->sfmode == MCAST_EXCLUDE; for (i=0; i<psl->sl_count; i++) { if (psl->sl_addr[i] == rmt_addr) break; } if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) return 0; if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) return 0; return 1; } /* * A socket is closing. */ void ip_mc_drop_socket(struct sock *sk) { struct inet_sock *inet = inet_sk(sk); struct ip_mc_socklist *iml; if (inet->mc_list == NULL) return; rtnl_lock(); while ((iml = inet->mc_list) != NULL) { struct in_device *in_dev; inet->mc_list = iml->next; if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) { (void) ip_mc_leave_src(sk, iml, in_dev); ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); in_dev_put(in_dev); } sock_kfree_s(sk, iml, sizeof(*iml)); } rtnl_unlock(); } int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto) { struct ip_mc_list *im; struct ip_sf_list *psf; int rv = 0; read_lock(&in_dev->mc_list_lock); for (im=in_dev->mc_list; im; im=im->next) { 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 */ } read_unlock(&in_dev->mc_list_lock); return rv; } #if defined(CONFIG_PROC_FS) struct igmp_mc_iter_state { 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 ip_mc_list *im = NULL; struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); for (state->dev = dev_base, state->in_dev = NULL; state->dev; state->dev = state->dev->next) { struct in_device *in_dev; in_dev = in_dev_get(state->dev); if (!in_dev) continue; read_lock(&in_dev->mc_list_lock); im = in_dev->mc_list; if (im) { state->in_dev = in_dev; break; } read_unlock(&in_dev->mc_list_lock); in_dev_put(in_dev); } 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 = im->next; while (!im) { if (likely(state->in_dev != NULL)) { read_unlock(&state->in_dev->mc_list_lock); in_dev_put(state->in_dev); } state->dev = state->dev->next; if (!state->dev) { state->in_dev = NULL; break; } state->in_dev = in_dev_get(state->dev); if (!state->in_dev) continue; read_lock(&state->in_dev->mc_list_lock); im = 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) { read_lock(&dev_base_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) { struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); if (likely(state->in_dev != NULL)) { read_unlock(&state->in_dev->mc_list_lock); in_dev_put(state->in_dev); state->in_dev = NULL; } state->dev = NULL; read_unlock(&dev_base_lock); } 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; #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 (state->in_dev->mc_list == im) { seq_printf(seq, "%d\t%-10s: %5d %7s\n", state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); } seq_printf(seq, "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n", im->multiaddr, im->users, im->tm_running, im->tm_running ? jiffies_to_clock_t(im->timer.expires-jiffies) : 0, im->reporter); } return 0; } static 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, }; static int igmp_mc_seq_open(struct inode *inode, struct file *file) { struct seq_file *seq; int rc = -ENOMEM; struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); if (!s) goto out; rc = seq_open(file, &igmp_mc_seq_ops); if (rc) goto out_kfree; seq = file->private_data; seq->private = s; memset(s, 0, sizeof(*s)); out: return rc; out_kfree: kfree(s); goto out; } static struct file_operations igmp_mc_seq_fops = { .owner = THIS_MODULE, .open = igmp_mc_seq_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, }; struct igmp_mcf_iter_state { 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 ip_sf_list *psf = NULL; struct ip_mc_list *im = NULL; struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); for (state->dev = dev_base, state->idev = NULL, state->im = NULL; state->dev; state->dev = state->dev->next) { struct in_device *idev; idev = in_dev_get(state->dev); if (unlikely(idev == NULL)) continue; read_lock(&idev->mc_list_lock); im = idev->mc_list; if (likely(im != NULL)) { spin_lock_bh(&im->lock); psf = im->sources; if (likely(psf != NULL)) { state->im = im; state->idev = idev; break; } spin_unlock_bh(&im->lock); } read_unlock(&idev->mc_list_lock); in_dev_put(idev); } 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) { if (likely(state->idev != NULL)) { read_unlock(&state->idev->mc_list_lock); in_dev_put(state->idev); } state->dev = state->dev->next; if (!state->dev) { state->idev = NULL; goto out; } state->idev = in_dev_get(state->dev); if (!state->idev) continue; read_lock(&state->idev->mc_list_lock); state->im = 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) { read_lock(&dev_base_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) { struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); if (likely(state->im != NULL)) { spin_unlock_bh(&state->im->lock); state->im = NULL; } if (likely(state->idev != NULL)) { read_unlock(&state->idev->mc_list_lock); in_dev_put(state->idev); state->idev = NULL; } state->dev = NULL; read_unlock(&dev_base_lock); } 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_printf(seq, "%3s %6s " "%10s %10s %6s %6s\n", "Idx", "Device", "MCA", "SRC", "INC", "EXC"); } 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 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 igmp_mcf_seq_open(struct inode *inode, struct file *file) { struct seq_file *seq; int rc = -ENOMEM; struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); if (!s) goto out; rc = seq_open(file, &igmp_mcf_seq_ops); if (rc) goto out_kfree; seq = file->private_data; seq->private = s; memset(s, 0, sizeof(*s)); out: return rc; out_kfree: kfree(s); goto out; } static struct file_operations igmp_mcf_seq_fops = { .owner = THIS_MODULE, .open = igmp_mcf_seq_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, }; int __init igmp_mc_proc_init(void) { proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); return 0; } #endif EXPORT_SYMBOL(ip_mc_dec_group); EXPORT_SYMBOL(ip_mc_inc_group); EXPORT_SYMBOL(ip_mc_join_group);