diff options
Diffstat (limited to 'net/ipv4/igmp.c')
| -rw-r--r-- | net/ipv4/igmp.c | 2473 |
1 files changed, 2473 insertions, 0 deletions
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c new file mode 100644 index 0000000..1f31831 --- /dev/null +++ b/net/ipv4/igmp.c @@ -0,0 +1,2473 @@ +/* + * 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, *i; + struct in_device *in_dev; + struct inet_sock *inet = inet_sk(sk); + 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; + } + + iml = (struct ip_mc_socklist *)sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); + + err = -EADDRINUSE; + for (i = inet->mc_list; i; i = i->next) { + if (memcmp(&i->multi, imr, sizeof(*imr)) == 0) { + /* New style additions are reference counted */ + if (imr->imr_address.s_addr == 0) { + i->count++; + err = 0; + } + goto done; + } + count++; + } + err = -ENOBUFS; + if (iml == NULL || count >= sysctl_igmp_max_memberships) + goto done; + memcpy(&iml->multi, imr, sizeof(*imr)); + iml->next = inet->mc_list; + iml->count = 1; + iml->sflist = NULL; + iml->sfmode = MCAST_EXCLUDE; + inet->mc_list = iml; + ip_mc_inc_group(in_dev, addr); + iml = NULL; + err = 0; + +done: + rtnl_shunlock(); + if (iml) + sock_kfree_s(sk, iml, sizeof(*iml)); + 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; + + rtnl_lock(); + for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { + if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr && + iml->multi.imr_address.s_addr==imr->imr_address.s_addr && + (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) { + struct in_device *in_dev; + + in_dev = inetdev_by_index(iml->multi.imr_ifindex); + if (in_dev) + (void) ip_mc_leave_src(sk, iml, in_dev); + if (--iml->count) { + rtnl_unlock(); + if (in_dev) + in_dev_put(in_dev); + return 0; + } + + *imlp = iml->next; + + if (in_dev) { + ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr); + in_dev_put(in_dev); + } + 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 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 (memcmp(&pmc->multi, mreqs, 2*sizeof(__u32)) == 0) + break; + } + if (!pmc) /* must have a prior join */ + goto done; + /* if a source filter was set, must be the same mode as before */ + if (pmc->sflist) { + if (pmc->sfmode != omode) + 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; + 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; + + /* 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(); + return err; +} + +int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) +{ + int err; + 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; + + 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; + } + 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; + 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; +done: + rtnl_shunlock(); + 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); |
