diff options
Diffstat (limited to 'net/ipv4/ipmr.c')
| -rw-r--r-- | net/ipv4/ipmr.c | 1900 |
1 files changed, 1900 insertions, 0 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c new file mode 100644 index 000000000000..e21c049ec62a --- /dev/null +++ b/net/ipv4/ipmr.c @@ -0,0 +1,1900 @@ +/* + * IP multicast routing support for mrouted 3.6/3.8 + * + * (c) 1995 Alan Cox, <alan@redhat.com> + * Linux Consultancy and Custom Driver Development + * + * 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. + * + * Version: $Id: ipmr.c,v 1.65 2001/10/31 21:55:54 davem Exp $ + * + * Fixes: + * Michael Chastain : Incorrect size of copying. + * Alan Cox : Added the cache manager code + * Alan Cox : Fixed the clone/copy bug and device race. + * Mike McLagan : Routing by source + * Malcolm Beattie : Buffer handling fixes. + * Alexey Kuznetsov : Double buffer free and other fixes. + * SVR Anand : Fixed several multicast bugs and problems. + * Alexey Kuznetsov : Status, optimisations and more. + * Brad Parker : Better behaviour on mrouted upcall + * overflow. + * Carlos Picoto : PIMv1 Support + * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header + * Relax this requrement to work with older peers. + * + */ + +#include <linux/config.h> +#include <asm/system.h> +#include <asm/uaccess.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/timer.h> +#include <linux/mm.h> +#include <linux/kernel.h> +#include <linux/fcntl.h> +#include <linux/stat.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/igmp.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/mroute.h> +#include <linux/init.h> +#include <net/ip.h> +#include <net/protocol.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/icmp.h> +#include <net/udp.h> +#include <net/raw.h> +#include <linux/notifier.h> +#include <linux/if_arp.h> +#include <linux/netfilter_ipv4.h> +#include <net/ipip.h> +#include <net/checksum.h> + +#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) +#define CONFIG_IP_PIMSM 1 +#endif + +static struct sock *mroute_socket; + + +/* Big lock, protecting vif table, mrt cache and mroute socket state. + Note that the changes are semaphored via rtnl_lock. + */ + +static DEFINE_RWLOCK(mrt_lock); + +/* + * Multicast router control variables + */ + +static struct vif_device vif_table[MAXVIFS]; /* Devices */ +static int maxvif; + +#define VIF_EXISTS(idx) (vif_table[idx].dev != NULL) + +static int mroute_do_assert; /* Set in PIM assert */ +static int mroute_do_pim; + +static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */ + +static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ +static atomic_t cache_resolve_queue_len; /* Size of unresolved */ + +/* Special spinlock for queue of unresolved entries */ +static DEFINE_SPINLOCK(mfc_unres_lock); + +/* We return to original Alan's scheme. Hash table of resolved + entries is changed only in process context and protected + with weak lock mrt_lock. Queue of unresolved entries is protected + with strong spinlock mfc_unres_lock. + + In this case data path is free of exclusive locks at all. + */ + +static kmem_cache_t *mrt_cachep; + +static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); +static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); +static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); + +#ifdef CONFIG_IP_PIMSM_V2 +static struct net_protocol pim_protocol; +#endif + +static struct timer_list ipmr_expire_timer; + +/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ + +static +struct net_device *ipmr_new_tunnel(struct vifctl *v) +{ + struct net_device *dev; + + dev = __dev_get_by_name("tunl0"); + + if (dev) { + int err; + struct ifreq ifr; + mm_segment_t oldfs; + struct ip_tunnel_parm p; + struct in_device *in_dev; + + memset(&p, 0, sizeof(p)); + p.iph.daddr = v->vifc_rmt_addr.s_addr; + p.iph.saddr = v->vifc_lcl_addr.s_addr; + p.iph.version = 4; + p.iph.ihl = 5; + p.iph.protocol = IPPROTO_IPIP; + sprintf(p.name, "dvmrp%d", v->vifc_vifi); + ifr.ifr_ifru.ifru_data = (void*)&p; + + oldfs = get_fs(); set_fs(KERNEL_DS); + err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); + set_fs(oldfs); + + dev = NULL; + + if (err == 0 && (dev = __dev_get_by_name(p.name)) != NULL) { + dev->flags |= IFF_MULTICAST; + + in_dev = __in_dev_get(dev); + if (in_dev == NULL && (in_dev = inetdev_init(dev)) == NULL) + goto failure; + in_dev->cnf.rp_filter = 0; + + if (dev_open(dev)) + goto failure; + } + } + return dev; + +failure: + /* allow the register to be completed before unregistering. */ + rtnl_unlock(); + rtnl_lock(); + + unregister_netdevice(dev); + return NULL; +} + +#ifdef CONFIG_IP_PIMSM + +static int reg_vif_num = -1; + +static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) +{ + read_lock(&mrt_lock); + ((struct net_device_stats*)dev->priv)->tx_bytes += skb->len; + ((struct net_device_stats*)dev->priv)->tx_packets++; + ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT); + read_unlock(&mrt_lock); + kfree_skb(skb); + return 0; +} + +static struct net_device_stats *reg_vif_get_stats(struct net_device *dev) +{ + return (struct net_device_stats*)dev->priv; +} + +static void reg_vif_setup(struct net_device *dev) +{ + dev->type = ARPHRD_PIMREG; + dev->mtu = 1500 - sizeof(struct iphdr) - 8; + dev->flags = IFF_NOARP; + dev->hard_start_xmit = reg_vif_xmit; + dev->get_stats = reg_vif_get_stats; + dev->destructor = free_netdev; +} + +static struct net_device *ipmr_reg_vif(void) +{ + struct net_device *dev; + struct in_device *in_dev; + + dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg", + reg_vif_setup); + + if (dev == NULL) + return NULL; + + if (register_netdevice(dev)) { + free_netdev(dev); + return NULL; + } + dev->iflink = 0; + + if ((in_dev = inetdev_init(dev)) == NULL) + goto failure; + + in_dev->cnf.rp_filter = 0; + + if (dev_open(dev)) + goto failure; + + return dev; + +failure: + /* allow the register to be completed before unregistering. */ + rtnl_unlock(); + rtnl_lock(); + + unregister_netdevice(dev); + return NULL; +} +#endif + +/* + * Delete a VIF entry + */ + +static int vif_delete(int vifi) +{ + struct vif_device *v; + struct net_device *dev; + struct in_device *in_dev; + + if (vifi < 0 || vifi >= maxvif) + return -EADDRNOTAVAIL; + + v = &vif_table[vifi]; + + write_lock_bh(&mrt_lock); + dev = v->dev; + v->dev = NULL; + + if (!dev) { + write_unlock_bh(&mrt_lock); + return -EADDRNOTAVAIL; + } + +#ifdef CONFIG_IP_PIMSM + if (vifi == reg_vif_num) + reg_vif_num = -1; +#endif + + if (vifi+1 == maxvif) { + int tmp; + for (tmp=vifi-1; tmp>=0; tmp--) { + if (VIF_EXISTS(tmp)) + break; + } + maxvif = tmp+1; + } + + write_unlock_bh(&mrt_lock); + + dev_set_allmulti(dev, -1); + + if ((in_dev = __in_dev_get(dev)) != NULL) { + in_dev->cnf.mc_forwarding--; + ip_rt_multicast_event(in_dev); + } + + if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) + unregister_netdevice(dev); + + dev_put(dev); + return 0; +} + +/* Destroy an unresolved cache entry, killing queued skbs + and reporting error to netlink readers. + */ + +static void ipmr_destroy_unres(struct mfc_cache *c) +{ + struct sk_buff *skb; + + atomic_dec(&cache_resolve_queue_len); + + while((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) { + if (skb->nh.iph->version == 0) { + struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); + nlh->nlmsg_type = NLMSG_ERROR; + nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); + skb_trim(skb, nlh->nlmsg_len); + ((struct nlmsgerr*)NLMSG_DATA(nlh))->error = -ETIMEDOUT; + netlink_unicast(rtnl, skb, NETLINK_CB(skb).dst_pid, MSG_DONTWAIT); + } else + kfree_skb(skb); + } + + kmem_cache_free(mrt_cachep, c); +} + + +/* Single timer process for all the unresolved queue. */ + +static void ipmr_expire_process(unsigned long dummy) +{ + unsigned long now; + unsigned long expires; + struct mfc_cache *c, **cp; + + if (!spin_trylock(&mfc_unres_lock)) { + mod_timer(&ipmr_expire_timer, jiffies+HZ/10); + return; + } + + if (atomic_read(&cache_resolve_queue_len) == 0) + goto out; + + now = jiffies; + expires = 10*HZ; + cp = &mfc_unres_queue; + + while ((c=*cp) != NULL) { + if (time_after(c->mfc_un.unres.expires, now)) { + unsigned long interval = c->mfc_un.unres.expires - now; + if (interval < expires) + expires = interval; + cp = &c->next; + continue; + } + + *cp = c->next; + + ipmr_destroy_unres(c); + } + + if (atomic_read(&cache_resolve_queue_len)) + mod_timer(&ipmr_expire_timer, jiffies + expires); + +out: + spin_unlock(&mfc_unres_lock); +} + +/* Fill oifs list. It is called under write locked mrt_lock. */ + +static void ipmr_update_threshoulds(struct mfc_cache *cache, unsigned char *ttls) +{ + int vifi; + + cache->mfc_un.res.minvif = MAXVIFS; + cache->mfc_un.res.maxvif = 0; + memset(cache->mfc_un.res.ttls, 255, MAXVIFS); + + for (vifi=0; vifi<maxvif; vifi++) { + if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { + cache->mfc_un.res.ttls[vifi] = ttls[vifi]; + if (cache->mfc_un.res.minvif > vifi) + cache->mfc_un.res.minvif = vifi; + if (cache->mfc_un.res.maxvif <= vifi) + cache->mfc_un.res.maxvif = vifi + 1; + } + } +} + +static int vif_add(struct vifctl *vifc, int mrtsock) +{ + int vifi = vifc->vifc_vifi; + struct vif_device *v = &vif_table[vifi]; + struct net_device *dev; + struct in_device *in_dev; + + /* Is vif busy ? */ + if (VIF_EXISTS(vifi)) + return -EADDRINUSE; + + switch (vifc->vifc_flags) { +#ifdef CONFIG_IP_PIMSM + case VIFF_REGISTER: + /* + * Special Purpose VIF in PIM + * All the packets will be sent to the daemon + */ + if (reg_vif_num >= 0) + return -EADDRINUSE; + dev = ipmr_reg_vif(); + if (!dev) + return -ENOBUFS; + break; +#endif + case VIFF_TUNNEL: + dev = ipmr_new_tunnel(vifc); + if (!dev) + return -ENOBUFS; + break; + case 0: + dev=ip_dev_find(vifc->vifc_lcl_addr.s_addr); + if (!dev) + return -EADDRNOTAVAIL; + __dev_put(dev); + break; + default: + return -EINVAL; + } + + if ((in_dev = __in_dev_get(dev)) == NULL) + return -EADDRNOTAVAIL; + in_dev->cnf.mc_forwarding++; + dev_set_allmulti(dev, +1); + ip_rt_multicast_event(in_dev); + + /* + * Fill in the VIF structures + */ + v->rate_limit=vifc->vifc_rate_limit; + v->local=vifc->vifc_lcl_addr.s_addr; + v->remote=vifc->vifc_rmt_addr.s_addr; + v->flags=vifc->vifc_flags; + if (!mrtsock) + v->flags |= VIFF_STATIC; + v->threshold=vifc->vifc_threshold; + v->bytes_in = 0; + v->bytes_out = 0; + v->pkt_in = 0; + v->pkt_out = 0; + v->link = dev->ifindex; + if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) + v->link = dev->iflink; + + /* And finish update writing critical data */ + write_lock_bh(&mrt_lock); + dev_hold(dev); + v->dev=dev; +#ifdef CONFIG_IP_PIMSM + if (v->flags&VIFF_REGISTER) + reg_vif_num = vifi; +#endif + if (vifi+1 > maxvif) + maxvif = vifi+1; + write_unlock_bh(&mrt_lock); + return 0; +} + +static struct mfc_cache *ipmr_cache_find(__u32 origin, __u32 mcastgrp) +{ + int line=MFC_HASH(mcastgrp,origin); + struct mfc_cache *c; + + for (c=mfc_cache_array[line]; c; c = c->next) { + if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) + break; + } + return c; +} + +/* + * Allocate a multicast cache entry + */ +static struct mfc_cache *ipmr_cache_alloc(void) +{ + struct mfc_cache *c=kmem_cache_alloc(mrt_cachep, GFP_KERNEL); + if(c==NULL) + return NULL; + memset(c, 0, sizeof(*c)); + c->mfc_un.res.minvif = MAXVIFS; + return c; +} + +static struct mfc_cache *ipmr_cache_alloc_unres(void) +{ + struct mfc_cache *c=kmem_cache_alloc(mrt_cachep, GFP_ATOMIC); + if(c==NULL) + return NULL; + memset(c, 0, sizeof(*c)); + skb_queue_head_init(&c->mfc_un.unres.unresolved); + c->mfc_un.unres.expires = jiffies + 10*HZ; + return c; +} + +/* + * A cache entry has gone into a resolved state from queued + */ + +static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) +{ + struct sk_buff *skb; + + /* + * Play the pending entries through our router + */ + + while((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) { + if (skb->nh.iph->version == 0) { + int err; + struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); + + if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { + nlh->nlmsg_len = skb->tail - (u8*)nlh; + } else { + nlh->nlmsg_type = NLMSG_ERROR; + nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); + skb_trim(skb, nlh->nlmsg_len); + ((struct nlmsgerr*)NLMSG_DATA(nlh))->error = -EMSGSIZE; + } + err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).dst_pid, MSG_DONTWAIT); + } else + ip_mr_forward(skb, c, 0); + } +} + +/* + * Bounce a cache query up to mrouted. We could use netlink for this but mrouted + * expects the following bizarre scheme. + * + * Called under mrt_lock. + */ + +static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) +{ + struct sk_buff *skb; + int ihl = pkt->nh.iph->ihl<<2; + struct igmphdr *igmp; + struct igmpmsg *msg; + int ret; + +#ifdef CONFIG_IP_PIMSM + if (assert == IGMPMSG_WHOLEPKT) + skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); + else +#endif + skb = alloc_skb(128, GFP_ATOMIC); + + if(!skb) + return -ENOBUFS; + +#ifdef CONFIG_IP_PIMSM + if (assert == IGMPMSG_WHOLEPKT) { + /* Ugly, but we have no choice with this interface. + Duplicate old header, fix ihl, length etc. + And all this only to mangle msg->im_msgtype and + to set msg->im_mbz to "mbz" :-) + */ + msg = (struct igmpmsg*)skb_push(skb, sizeof(struct iphdr)); + skb->nh.raw = skb->h.raw = (u8*)msg; + memcpy(msg, pkt->nh.raw, sizeof(struct iphdr)); + msg->im_msgtype = IGMPMSG_WHOLEPKT; + msg->im_mbz = 0; + msg->im_vif = reg_vif_num; + skb->nh.iph->ihl = sizeof(struct iphdr) >> 2; + skb->nh.iph->tot_len = htons(ntohs(pkt->nh.iph->tot_len) + sizeof(struct iphdr)); + } else +#endif + { + + /* + * Copy the IP header + */ + + skb->nh.iph = (struct iphdr *)skb_put(skb, ihl); + memcpy(skb->data,pkt->data,ihl); + skb->nh.iph->protocol = 0; /* Flag to the kernel this is a route add */ + msg = (struct igmpmsg*)skb->nh.iph; + msg->im_vif = vifi; + skb->dst = dst_clone(pkt->dst); + + /* + * Add our header + */ + + igmp=(struct igmphdr *)skb_put(skb,sizeof(struct igmphdr)); + igmp->type = + msg->im_msgtype = assert; + igmp->code = 0; + skb->nh.iph->tot_len=htons(skb->len); /* Fix the length */ + skb->h.raw = skb->nh.raw; + } + + if (mroute_socket == NULL) { + kfree_skb(skb); + return -EINVAL; + } + + /* + * Deliver to mrouted + */ + if ((ret=sock_queue_rcv_skb(mroute_socket,skb))<0) { + if (net_ratelimit()) + printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); + kfree_skb(skb); + } + + return ret; +} + +/* + * Queue a packet for resolution. It gets locked cache entry! + */ + +static int +ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) +{ + int err; + struct mfc_cache *c; + + spin_lock_bh(&mfc_unres_lock); + for (c=mfc_unres_queue; c; c=c->next) { + if (c->mfc_mcastgrp == skb->nh.iph->daddr && + c->mfc_origin == skb->nh.iph->saddr) + break; + } + + if (c == NULL) { + /* + * Create a new entry if allowable + */ + + if (atomic_read(&cache_resolve_queue_len)>=10 || + (c=ipmr_cache_alloc_unres())==NULL) { + spin_unlock_bh(&mfc_unres_lock); + + kfree_skb(skb); + return -ENOBUFS; + } + + /* + * Fill in the new cache entry + */ + c->mfc_parent=-1; + c->mfc_origin=skb->nh.iph->saddr; + c->mfc_mcastgrp=skb->nh.iph->daddr; + + /* + * Reflect first query at mrouted. + */ + if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { + /* If the report failed throw the cache entry + out - Brad Parker + */ + spin_unlock_bh(&mfc_unres_lock); + + kmem_cache_free(mrt_cachep, c); + kfree_skb(skb); + return err; + } + + atomic_inc(&cache_resolve_queue_len); + c->next = mfc_unres_queue; + mfc_unres_queue = c; + + mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); + } + + /* + * See if we can append the packet + */ + if (c->mfc_un.unres.unresolved.qlen>3) { + kfree_skb(skb); + err = -ENOBUFS; + } else { + skb_queue_tail(&c->mfc_un.unres.unresolved,skb); + err = 0; + } + + spin_unlock_bh(&mfc_unres_lock); + return err; +} + +/* + * MFC cache manipulation by user space mroute daemon + */ + +static int ipmr_mfc_delete(struct mfcctl *mfc) +{ + int line; + struct mfc_cache *c, **cp; + + line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); + + for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { + if (c->mfc_origin == mfc->mfcc_origin.s_addr && + c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { + write_lock_bh(&mrt_lock); + *cp = c->next; + write_unlock_bh(&mrt_lock); + + kmem_cache_free(mrt_cachep, c); + return 0; + } + } + return -ENOENT; +} + +static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) +{ + int line; + struct mfc_cache *uc, *c, **cp; + + line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); + + for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { + if (c->mfc_origin == mfc->mfcc_origin.s_addr && + c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) + break; + } + + if (c != NULL) { + write_lock_bh(&mrt_lock); + c->mfc_parent = mfc->mfcc_parent; + ipmr_update_threshoulds(c, mfc->mfcc_ttls); + if (!mrtsock) + c->mfc_flags |= MFC_STATIC; + write_unlock_bh(&mrt_lock); + return 0; + } + + if(!MULTICAST(mfc->mfcc_mcastgrp.s_addr)) + return -EINVAL; + + c=ipmr_cache_alloc(); + if (c==NULL) + return -ENOMEM; + + c->mfc_origin=mfc->mfcc_origin.s_addr; + c->mfc_mcastgrp=mfc->mfcc_mcastgrp.s_addr; + c->mfc_parent=mfc->mfcc_parent; + ipmr_update_threshoulds(c, mfc->mfcc_ttls); + if (!mrtsock) + c->mfc_flags |= MFC_STATIC; + + write_lock_bh(&mrt_lock); + c->next = mfc_cache_array[line]; + mfc_cache_array[line] = c; + write_unlock_bh(&mrt_lock); + + /* + * Check to see if we resolved a queued list. If so we + * need to send on the frames and tidy up. + */ + spin_lock_bh(&mfc_unres_lock); + for (cp = &mfc_unres_queue; (uc=*cp) != NULL; + cp = &uc->next) { + if (uc->mfc_origin == c->mfc_origin && + uc->mfc_mcastgrp == c->mfc_mcastgrp) { + *cp = uc->next; + if (atomic_dec_and_test(&cache_resolve_queue_len)) + del_timer(&ipmr_expire_timer); + break; + } + } + spin_unlock_bh(&mfc_unres_lock); + + if (uc) { + ipmr_cache_resolve(uc, c); + kmem_cache_free(mrt_cachep, uc); + } + return 0; +} + +/* + * Close the multicast socket, and clear the vif tables etc + */ + +static void mroute_clean_tables(struct sock *sk) +{ + int i; + + /* + * Shut down all active vif entries + */ + for(i=0; i<maxvif; i++) { + if (!(vif_table[i].flags&VIFF_STATIC)) + vif_delete(i); + } + + /* + * Wipe the cache + */ + for (i=0;i<MFC_LINES;i++) { + struct mfc_cache *c, **cp; + + cp = &mfc_cache_array[i]; + while ((c = *cp) != NULL) { + if (c->mfc_flags&MFC_STATIC) { + cp = &c->next; + continue; + } + write_lock_bh(&mrt_lock); + *cp = c->next; + write_unlock_bh(&mrt_lock); + + kmem_cache_free(mrt_cachep, c); + } + } + + if (atomic_read(&cache_resolve_queue_len) != 0) { + struct mfc_cache *c; + + spin_lock_bh(&mfc_unres_lock); + while (mfc_unres_queue != NULL) { + c = mfc_unres_queue; + mfc_unres_queue = c->next; + spin_unlock_bh(&mfc_unres_lock); + + ipmr_destroy_unres(c); + + spin_lock_bh(&mfc_unres_lock); + } + spin_unlock_bh(&mfc_unres_lock); + } +} + +static void mrtsock_destruct(struct sock *sk) +{ + rtnl_lock(); + if (sk == mroute_socket) { + ipv4_devconf.mc_forwarding--; + + write_lock_bh(&mrt_lock); + mroute_socket=NULL; + write_unlock_bh(&mrt_lock); + + mroute_clean_tables(sk); + } + rtnl_unlock(); +} + +/* + * Socket options and virtual interface manipulation. The whole + * virtual interface system is a complete heap, but unfortunately + * that's how BSD mrouted happens to think. Maybe one day with a proper + * MOSPF/PIM router set up we can clean this up. + */ + +int ip_mroute_setsockopt(struct sock *sk,int optname,char __user *optval,int optlen) +{ + int ret; + struct vifctl vif; + struct mfcctl mfc; + + if(optname!=MRT_INIT) + { + if(sk!=mroute_socket && !capable(CAP_NET_ADMIN)) + return -EACCES; + } + + switch(optname) + { + case MRT_INIT: + if (sk->sk_type != SOCK_RAW || + inet_sk(sk)->num != IPPROTO_IGMP) + return -EOPNOTSUPP; + if(optlen!=sizeof(int)) + return -ENOPROTOOPT; + + rtnl_lock(); + if (mroute_socket) { + rtnl_unlock(); + return -EADDRINUSE; + } + + ret = ip_ra_control(sk, 1, mrtsock_destruct); + if (ret == 0) { + write_lock_bh(&mrt_lock); + mroute_socket=sk; + write_unlock_bh(&mrt_lock); + + ipv4_devconf.mc_forwarding++; + } + rtnl_unlock(); + return ret; + case MRT_DONE: + if (sk!=mroute_socket) + return -EACCES; + return ip_ra_control(sk, 0, NULL); + case MRT_ADD_VIF: + case MRT_DEL_VIF: + if(optlen!=sizeof(vif)) + return -EINVAL; + if (copy_from_user(&vif,optval,sizeof(vif))) + return -EFAULT; + if(vif.vifc_vifi >= MAXVIFS) + return -ENFILE; + rtnl_lock(); + if (optname==MRT_ADD_VIF) { + ret = vif_add(&vif, sk==mroute_socket); + } else { + ret = vif_delete(vif.vifc_vifi); + } + rtnl_unlock(); + return ret; + + /* + * Manipulate the forwarding caches. These live + * in a sort of kernel/user symbiosis. + */ + case MRT_ADD_MFC: + case MRT_DEL_MFC: + if(optlen!=sizeof(mfc)) + return -EINVAL; + if (copy_from_user(&mfc,optval, sizeof(mfc))) + return -EFAULT; + rtnl_lock(); + if (optname==MRT_DEL_MFC) + ret = ipmr_mfc_delete(&mfc); + else + ret = ipmr_mfc_add(&mfc, sk==mroute_socket); + rtnl_unlock(); + return ret; + /* + * Control PIM assert. + */ + case MRT_ASSERT: + { + int v; + if(get_user(v,(int __user *)optval)) + return -EFAULT; + mroute_do_assert=(v)?1:0; + return 0; + } +#ifdef CONFIG_IP_PIMSM + case MRT_PIM: + { + int v, ret; + if(get_user(v,(int __user *)optval)) + return -EFAULT; + v = (v)?1:0; + rtnl_lock(); + ret = 0; + if (v != mroute_do_pim) { + mroute_do_pim = v; + mroute_do_assert = v; +#ifdef CONFIG_IP_PIMSM_V2 + if (mroute_do_pim) + ret = inet_add_protocol(&pim_protocol, + IPPROTO_PIM); + else + ret = inet_del_protocol(&pim_protocol, + IPPROTO_PIM); + if (ret < 0) + ret = -EAGAIN; +#endif + } + rtnl_unlock(); + return ret; + } +#endif + /* + * Spurious command, or MRT_VERSION which you cannot + * set. + */ + default: + return -ENOPROTOOPT; + } +} + +/* + * Getsock opt support for the multicast routing system. + */ + +int ip_mroute_getsockopt(struct sock *sk,int optname,char __user *optval,int __user *optlen) +{ + int olr; + int val; + + if(optname!=MRT_VERSION && +#ifdef CONFIG_IP_PIMSM + optname!=MRT_PIM && +#endif + optname!=MRT_ASSERT) + return -ENOPROTOOPT; + + if (get_user(olr, optlen)) + return -EFAULT; + + olr = min_t(unsigned int, olr, sizeof(int)); + if (olr < 0) + return -EINVAL; + + if(put_user(olr,optlen)) + return -EFAULT; + if(optname==MRT_VERSION) + val=0x0305; +#ifdef CONFIG_IP_PIMSM + else if(optname==MRT_PIM) + val=mroute_do_pim; +#endif + else + val=mroute_do_assert; + if(copy_to_user(optval,&val,olr)) + return -EFAULT; + return 0; +} + +/* + * The IP multicast ioctl support routines. + */ + +int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) +{ + struct sioc_sg_req sr; + struct sioc_vif_req vr; + struct vif_device *vif; + struct mfc_cache *c; + + switch(cmd) + { + case SIOCGETVIFCNT: + if (copy_from_user(&vr,arg,sizeof(vr))) + return -EFAULT; + if(vr.vifi>=maxvif) + return -EINVAL; + read_lock(&mrt_lock); + vif=&vif_table[vr.vifi]; + if(VIF_EXISTS(vr.vifi)) { + vr.icount=vif->pkt_in; + vr.ocount=vif->pkt_out; + vr.ibytes=vif->bytes_in; + vr.obytes=vif->bytes_out; + read_unlock(&mrt_lock); + + if (copy_to_user(arg,&vr,sizeof(vr))) + return -EFAULT; + return 0; + } + read_unlock(&mrt_lock); + return -EADDRNOTAVAIL; + case SIOCGETSGCNT: + if (copy_from_user(&sr,arg,sizeof(sr))) + return -EFAULT; + + read_lock(&mrt_lock); + c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); + if (c) { + sr.pktcnt = c->mfc_un.res.pkt; + sr.bytecnt = c->mfc_un.res.bytes; + sr.wrong_if = c->mfc_un.res.wrong_if; + read_unlock(&mrt_lock); + + if (copy_to_user(arg,&sr,sizeof(sr))) + return -EFAULT; + return 0; + } + read_unlock(&mrt_lock); + return -EADDRNOTAVAIL; + default: + return -ENOIOCTLCMD; + } +} + + +static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + struct vif_device *v; + int ct; + if (event != NETDEV_UNREGISTER) + return NOTIFY_DONE; + v=&vif_table[0]; + for(ct=0;ct<maxvif;ct++,v++) { + if (v->dev==ptr) + vif_delete(ct); + } + return NOTIFY_DONE; +} + + +static struct notifier_block ip_mr_notifier={ + .notifier_call = ipmr_device_event, +}; + +/* + * Encapsulate a packet by attaching a valid IPIP header to it. + * This avoids tunnel drivers and other mess and gives us the speed so + * important for multicast video. + */ + +static void ip_encap(struct sk_buff *skb, u32 saddr, u32 daddr) +{ + struct iphdr *iph = (struct iphdr *)skb_push(skb,sizeof(struct iphdr)); + + iph->version = 4; + iph->tos = skb->nh.iph->tos; + iph->ttl = skb->nh.iph->ttl; + iph->frag_off = 0; + iph->daddr = daddr; + iph->saddr = saddr; + iph->protocol = IPPROTO_IPIP; + iph->ihl = 5; + iph->tot_len = htons(skb->len); + ip_select_ident(iph, skb->dst, NULL); + ip_send_check(iph); + + skb->h.ipiph = skb->nh.iph; + skb->nh.iph = iph; + memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); + nf_reset(skb); +} + +static inline int ipmr_forward_finish(struct sk_buff *skb) +{ + struct ip_options * opt = &(IPCB(skb)->opt); + + IP_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); + + if (unlikely(opt->optlen)) + ip_forward_options(skb); + + return dst_output(skb); +} + +/* + * Processing handlers for ipmr_forward + */ + +static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) +{ + struct iphdr *iph = skb->nh.iph; + struct vif_device *vif = &vif_table[vifi]; + struct net_device *dev; + struct rtable *rt; + int encap = 0; + + if (vif->dev == NULL) + goto out_free; + +#ifdef CONFIG_IP_PIMSM + if (vif->flags & VIFF_REGISTER) { + vif->pkt_out++; + vif->bytes_out+=skb->len; + ((struct net_device_stats*)vif->dev->priv)->tx_bytes += skb->len; + ((struct net_device_stats*)vif->dev->priv)->tx_packets++; + ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); + kfree_skb(skb); + return; + } +#endif + + if (vif->flags&VIFF_TUNNEL) { + struct flowi fl = { .oif = vif->link, + .nl_u = { .ip4_u = + { .daddr = vif->remote, + .saddr = vif->local, + .tos = RT_TOS(iph->tos) } }, + .proto = IPPROTO_IPIP }; + if (ip_route_output_key(&rt, &fl)) + goto out_free; + encap = sizeof(struct iphdr); + } else { + struct flowi fl = { .oif = vif->link, + .nl_u = { .ip4_u = + { .daddr = iph->daddr, + .tos = RT_TOS(iph->tos) } }, + .proto = IPPROTO_IPIP }; + if (ip_route_output_key(&rt, &fl)) + goto out_free; + } + + dev = rt->u.dst.dev; + + if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { + /* Do not fragment multicasts. Alas, IPv4 does not + allow to send ICMP, so that packets will disappear + to blackhole. + */ + + IP_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); + ip_rt_put(rt); + goto out_free; + } + + encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; + + if (skb_cow(skb, encap)) { + ip_rt_put(rt); + goto out_free; + } + + vif->pkt_out++; + vif->bytes_out+=skb->len; + + dst_release(skb->dst); + skb->dst = &rt->u.dst; + iph = skb->nh.iph; + ip_decrease_ttl(iph); + + /* FIXME: forward and output firewalls used to be called here. + * What do we do with netfilter? -- RR */ + if (vif->flags & VIFF_TUNNEL) { + ip_encap(skb, vif->local, vif->remote); + /* FIXME: extra output firewall step used to be here. --RR */ + ((struct ip_tunnel *)vif->dev->priv)->stat.tx_packets++; + ((struct ip_tunnel *)vif->dev->priv)->stat.tx_bytes+=skb->len; + } + + IPCB(skb)->flags |= IPSKB_FORWARDED; + + /* + * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally + * not only before forwarding, but after forwarding on all output + * interfaces. It is clear, if mrouter runs a multicasting + * program, it should receive packets not depending to what interface + * program is joined. + * If we will not make it, the program will have to join on all + * interfaces. On the other hand, multihoming host (or router, but + * not mrouter) cannot join to more than one interface - it will + * result in receiving multiple packets. + */ + NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, dev, + ipmr_forward_finish); + return; + +out_free: + kfree_skb(skb); + return; +} + +static int ipmr_find_vif(struct net_device *dev) +{ + int ct; + for (ct=maxvif-1; ct>=0; ct--) { + if (vif_table[ct].dev == dev) + break; + } + return ct; +} + +/* "local" means that we should preserve one skb (for local delivery) */ + +static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) +{ + int psend = -1; + int vif, ct; + + vif = cache->mfc_parent; + cache->mfc_un.res.pkt++; + cache->mfc_un.res.bytes += skb->len; + + /* + * Wrong interface: drop packet and (maybe) send PIM assert. + */ + if (vif_table[vif].dev != skb->dev) { + int true_vifi; + + if (((struct rtable*)skb->dst)->fl.iif == 0) { + /* It is our own packet, looped back. + Very complicated situation... + + The best workaround until routing daemons will be + fixed is not to redistribute packet, if it was + send through wrong interface. It means, that + multicast applications WILL NOT work for + (S,G), which have default multicast route pointing + to wrong oif. In any case, it is not a good + idea to use multicasting applications on router. + */ + goto dont_forward; + } + + cache->mfc_un.res.wrong_if++; + true_vifi = ipmr_find_vif(skb->dev); + + if (true_vifi >= 0 && mroute_do_assert && + /* pimsm uses asserts, when switching from RPT to SPT, + so that we cannot check that packet arrived on an oif. + It is bad, but otherwise we would need to move pretty + large chunk of pimd to kernel. Ough... --ANK + */ + (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && + time_after(jiffies, + cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { + cache->mfc_un.res.last_assert = jiffies; + ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); + } + goto dont_forward; + } + + vif_table[vif].pkt_in++; + vif_table[vif].bytes_in+=skb->len; + + /* + * Forward the frame + */ + for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { + if (skb->nh.iph->ttl > cache->mfc_un.res.ttls[ct]) { + if (psend != -1) { + struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); + if (skb2) + ipmr_queue_xmit(skb2, cache, psend); + } + psend=ct; + } + } + if (psend != -1) { + if (local) { + struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); + if (skb2) + ipmr_queue_xmit(skb2, cache, psend); + } else { + ipmr_queue_xmit(skb, cache, psend); + return 0; + } + } + +dont_forward: + if (!local) + kfree_skb(skb); + return 0; +} + + +/* + * Multicast packets for forwarding arrive here + */ + +int ip_mr_input(struct sk_buff *skb) +{ + struct mfc_cache *cache; + int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL; + + /* Packet is looped back after forward, it should not be + forwarded second time, but still can be delivered locally. + */ + if (IPCB(skb)->flags&IPSKB_FORWARDED) + goto dont_forward; + + if (!local) { + if (IPCB(skb)->opt.router_alert) { + if (ip_call_ra_chain(skb)) + return 0; + } else if (skb->nh.iph->protocol == IPPROTO_IGMP){ + /* IGMPv1 (and broken IGMPv2 implementations sort of + Cisco IOS <= 11.2(8)) do not put router alert + option to IGMP packets destined to routable + groups. It is very bad, because it means + that we can forward NO IGMP messages. + */ + read_lock(&mrt_lock); + if (mroute_socket) { + raw_rcv(mroute_socket, skb); + read_unlock(&mrt_lock); + return 0; + } + read_unlock(&mrt_lock); + } + } + + read_lock(&mrt_lock); + cache = ipmr_cache_find(skb->nh.iph->saddr, skb->nh.iph->daddr); + + /* + * No usable cache entry + */ + if (cache==NULL) { + int vif; + + if (local) { + struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); + ip_local_deliver(skb); + if (skb2 == NULL) { + read_unlock(&mrt_lock); + return -ENOBUFS; + } + skb = skb2; + } + + vif = ipmr_find_vif(skb->dev); + if (vif >= 0) { + int err = ipmr_cache_unresolved(vif, skb); + read_unlock(&mrt_lock); + + return err; + } + read_unlock(&mrt_lock); + kfree_skb(skb); + return -ENODEV; + } + + ip_mr_forward(skb, cache, local); + + read_unlock(&mrt_lock); + + if (local) + return ip_local_deliver(skb); + + return 0; + +dont_forward: + if (local) + return ip_local_deliver(skb); + kfree_skb(skb); + return 0; +} + +#ifdef CONFIG_IP_PIMSM_V1 +/* + * Handle IGMP messages of PIMv1 + */ + +int pim_rcv_v1(struct sk_buff * skb) +{ + struct igmphdr *pim; + struct iphdr *encap; + struct net_device *reg_dev = NULL; + + if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) + goto drop; + + pim = (struct igmphdr*)skb->h.raw; + + if (!mroute_do_pim || + skb->len < sizeof(*pim) + sizeof(*encap) || + pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) + goto drop; + + encap = (struct iphdr*)(skb->h.raw + sizeof(struct igmphdr)); + /* + Check that: + a. packet is really destinted to a multicast group + b. packet is not a NULL-REGISTER + c. packet is not truncated + */ + if (!MULTICAST(encap->daddr) || + encap->tot_len == 0 || + ntohs(encap->tot_len) + sizeof(*pim) > skb->len) + goto drop; + + read_lock(&mrt_lock); + if (reg_vif_num >= 0) + reg_dev = vif_table[reg_vif_num].dev; + if (reg_dev) + dev_hold(reg_dev); + read_unlock(&mrt_lock); + + if (reg_dev == NULL) + goto drop; + + skb->mac.raw = skb->nh.raw; + skb_pull(skb, (u8*)encap - skb->data); + skb->nh.iph = (struct iphdr *)skb->data; + skb->dev = reg_dev; + memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); + skb->protocol = htons(ETH_P_IP); + skb->ip_summed = 0; + skb->pkt_type = PACKET_HOST; + dst_release(skb->dst); + skb->dst = NULL; + ((struct net_device_stats*)reg_dev->priv)->rx_bytes += skb->len; + ((struct net_device_stats*)reg_dev->priv)->rx_packets++; + nf_reset(skb); + netif_rx(skb); + dev_put(reg_dev); + return 0; + drop: + kfree_skb(skb); + return 0; +} +#endif + +#ifdef CONFIG_IP_PIMSM_V2 +static int pim_rcv(struct sk_buff * skb) +{ + struct pimreghdr *pim; + struct iphdr *encap; + struct net_device *reg_dev = NULL; + + if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) + goto drop; + + pim = (struct pimreghdr*)skb->h.raw; + if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || + (pim->flags&PIM_NULL_REGISTER) || + (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && + (u16)csum_fold(skb_checksum(skb, 0, skb->len, 0)))) + goto drop; + + /* check if the inner packet is destined to mcast group */ + encap = (struct iphdr*)(skb->h.raw + sizeof(struct pimreghdr)); + if (!MULTICAST(encap->daddr) || + encap->tot_len == 0 || + ntohs(encap->tot_len) + sizeof(*pim) > skb->len) + goto drop; + + read_lock(&mrt_lock); + if (reg_vif_num >= 0) + reg_dev = vif_table[reg_vif_num].dev; + if (reg_dev) + dev_hold(reg_dev); + read_unlock(&mrt_lock); + + if (reg_dev == NULL) + goto drop; + + skb->mac.raw = skb->nh.raw; + skb_pull(skb, (u8*)encap - skb->data); + skb->nh.iph = (struct iphdr *)skb->data; + skb->dev = reg_dev; + memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); + skb->protocol = htons(ETH_P_IP); + skb->ip_summed = 0; + skb->pkt_type = PACKET_HOST; + dst_release(skb->dst); + ((struct net_device_stats*)reg_dev->priv)->rx_bytes += skb->len; + ((struct net_device_stats*)reg_dev->priv)->rx_packets++; + skb->dst = NULL; + nf_reset(skb); + netif_rx(skb); + dev_put(reg_dev); + return 0; + drop: + kfree_skb(skb); + return 0; +} +#endif + +static int +ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) +{ + int ct; + struct rtnexthop *nhp; + struct net_device *dev = vif_table[c->mfc_parent].dev; + u8 *b = skb->tail; + struct rtattr *mp_head; + + if (dev) + RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); + + mp_head = (struct rtattr*)skb_put(skb, RTA_LENGTH(0)); + + for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { + if (c->mfc_un.res.ttls[ct] < 255) { + if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) + goto rtattr_failure; + nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); + nhp->rtnh_flags = 0; + nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; + nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; + nhp->rtnh_len = sizeof(*nhp); + } + } + mp_head->rta_type = RTA_MULTIPATH; + mp_head->rta_len = skb->tail - (u8*)mp_head; + rtm->rtm_type = RTN_MULTICAST; + return 1; + +rtattr_failure: + skb_trim(skb, b - skb->data); + return -EMSGSIZE; +} + +int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) +{ + int err; + struct mfc_cache *cache; + struct rtable *rt = (struct rtable*)skb->dst; + + read_lock(&mrt_lock); + cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); + + if (cache==NULL) { + struct net_device *dev; + int vif; + + if (nowait) { + read_unlock(&mrt_lock); + return -EAGAIN; + } + + dev = skb->dev; + if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { + read_unlock(&mrt_lock); + return -ENODEV; + } + skb->nh.raw = skb_push(skb, sizeof(struct iphdr)); + skb->nh.iph->ihl = sizeof(struct iphdr)>>2; + skb->nh.iph->saddr = rt->rt_src; + skb->nh.iph->daddr = rt->rt_dst; + skb->nh.iph->version = 0; + err = ipmr_cache_unresolved(vif, skb); + read_unlock(&mrt_lock); + return err; + } + + if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) + cache->mfc_flags |= MFC_NOTIFY; + err = ipmr_fill_mroute(skb, cache, rtm); + read_unlock(&mrt_lock); + return err; +} + +#ifdef CONFIG_PROC_FS +/* + * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif + */ +struct ipmr_vif_iter { + int ct; +}; + +static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, + loff_t pos) +{ + for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { + if(!VIF_EXISTS(iter->ct)) + continue; + if (pos-- == 0) + return &vif_table[iter->ct]; + } + return NULL; +} + +static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) +{ + read_lock(&mrt_lock); + return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) + : SEQ_START_TOKEN; +} + +static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct ipmr_vif_iter *iter = seq->private; + + ++*pos; + if (v == SEQ_START_TOKEN) + return ipmr_vif_seq_idx(iter, 0); + + while (++iter->ct < maxvif) { + if(!VIF_EXISTS(iter->ct)) + continue; + return &vif_table[iter->ct]; + } + return NULL; +} + +static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) +{ + read_unlock(&mrt_lock); +} + +static int ipmr_vif_seq_show(struct seq_file *seq, void *v) +{ + if (v == SEQ_START_TOKEN) { + seq_puts(seq, + "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); + } else { + const struct vif_device *vif = v; + const char *name = vif->dev ? vif->dev->name : "none"; + + seq_printf(seq, + "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", + vif - vif_table, + name, vif->bytes_in, vif->pkt_in, + vif->bytes_out, vif->pkt_out, + vif->flags, vif->local, vif->remote); + } + return 0; +} + +static struct seq_operations ipmr_vif_seq_ops = { + .start = ipmr_vif_seq_start, + .next = ipmr_vif_seq_next, + .stop = ipmr_vif_seq_stop, + .show = ipmr_vif_seq_show, +}; + +static int ipmr_vif_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + int rc = -ENOMEM; + struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); + + if (!s) + goto out; + + rc = seq_open(file, &ipmr_vif_seq_ops); + if (rc) + goto out_kfree; + + s->ct = 0; + seq = file->private_data; + seq->private = s; +out: + return rc; +out_kfree: + kfree(s); + goto out; + +} + +static struct file_operations ipmr_vif_fops = { + .owner = THIS_MODULE, + .open = ipmr_vif_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; + +struct ipmr_mfc_iter { + struct mfc_cache **cache; + int ct; +}; + + +static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) +{ + struct mfc_cache *mfc; + + it->cache = mfc_cache_array; + read_lock(&mrt_lock); + for (it->ct = 0; it->ct < MFC_LINES; it->ct++) + for(mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) + if (pos-- == 0) + return mfc; + read_unlock(&mrt_lock); + + it->cache = &mfc_unres_queue; + spin_lock_bh(&mfc_unres_lock); + for(mfc = mfc_unres_queue; mfc; mfc = mfc->next) + if (pos-- == 0) + return mfc; + spin_unlock_bh(&mfc_unres_lock); + + it->cache = NULL; + return NULL; +} + + +static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) +{ + struct ipmr_mfc_iter *it = seq->private; + it->cache = NULL; + it->ct = 0; + return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) + : SEQ_START_TOKEN; +} + +static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct mfc_cache *mfc = v; + struct ipmr_mfc_iter *it = seq->private; + + ++*pos; + + if (v == SEQ_START_TOKEN) + return ipmr_mfc_seq_idx(seq->private, 0); + + if (mfc->next) + return mfc->next; + + if (it->cache == &mfc_unres_queue) + goto end_of_list; + + BUG_ON(it->cache != mfc_cache_array); + + while (++it->ct < MFC_LINES) { + mfc = mfc_cache_array[it->ct]; + if (mfc) + return mfc; + } + + /* exhausted cache_array, show unresolved */ + read_unlock(&mrt_lock); + it->cache = &mfc_unres_queue; + it->ct = 0; + + spin_lock_bh(&mfc_unres_lock); + mfc = mfc_unres_queue; + if (mfc) + return mfc; + + end_of_list: + spin_unlock_bh(&mfc_unres_lock); + it->cache = NULL; + + return NULL; +} + +static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) +{ + struct ipmr_mfc_iter *it = seq->private; + + if (it->cache == &mfc_unres_queue) + spin_unlock_bh(&mfc_unres_lock); + else if (it->cache == mfc_cache_array) + read_unlock(&mrt_lock); +} + +static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) +{ + int n; + + if (v == SEQ_START_TOKEN) { + seq_puts(seq, + "Group Origin Iif Pkts Bytes Wrong Oifs\n"); + } else { + const struct mfc_cache *mfc = v; + const struct ipmr_mfc_iter *it = seq->private; + + seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld", + (unsigned long) mfc->mfc_mcastgrp, + (unsigned long) mfc->mfc_origin, + mfc->mfc_parent, + mfc->mfc_un.res.pkt, + mfc->mfc_un.res.bytes, + mfc->mfc_un.res.wrong_if); + + if (it->cache != &mfc_unres_queue) { + for(n = mfc->mfc_un.res.minvif; + n < mfc->mfc_un.res.maxvif; n++ ) { + if(VIF_EXISTS(n) + && mfc->mfc_un.res.ttls[n] < 255) + seq_printf(seq, + " %2d:%-3d", + n, mfc->mfc_un.res.ttls[n]); + } + } + seq_putc(seq, '\n'); + } + return 0; +} + +static struct seq_operations ipmr_mfc_seq_ops = { + .start = ipmr_mfc_seq_start, + .next = ipmr_mfc_seq_next, + .stop = ipmr_mfc_seq_stop, + .show = ipmr_mfc_seq_show, +}; + +static int ipmr_mfc_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + int rc = -ENOMEM; + struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); + + if (!s) + goto out; + + rc = seq_open(file, &ipmr_mfc_seq_ops); + if (rc) + goto out_kfree; + + seq = file->private_data; + seq->private = s; +out: + return rc; +out_kfree: + kfree(s); + goto out; + +} + +static struct file_operations ipmr_mfc_fops = { + .owner = THIS_MODULE, + .open = ipmr_mfc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; +#endif + +#ifdef CONFIG_IP_PIMSM_V2 +static struct net_protocol pim_protocol = { + .handler = pim_rcv, +}; +#endif + + +/* + * Setup for IP multicast routing + */ + +void __init ip_mr_init(void) +{ + mrt_cachep = kmem_cache_create("ip_mrt_cache", + sizeof(struct mfc_cache), + 0, SLAB_HWCACHE_ALIGN, + NULL, NULL); + if (!mrt_cachep) + panic("cannot allocate ip_mrt_cache"); + + init_timer(&ipmr_expire_timer); + ipmr_expire_timer.function=ipmr_expire_process; + register_netdevice_notifier(&ip_mr_notifier); +#ifdef CONFIG_PROC_FS + proc_net_fops_create("ip_mr_vif", 0, &ipmr_vif_fops); + proc_net_fops_create("ip_mr_cache", 0, &ipmr_mfc_fops); +#endif +} |