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-rw-r--r--net/ipv4/ipmr.c1900
1 files changed, 1900 insertions, 0 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
new file mode 100644
index 0000000..e21c049
--- /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
+}
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