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27d7ff46a3
To clearly state the intent of copying to linear sk_buffs, _offset being a overly long variant but interesting for the sake of saving some bytes. Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
1922 lines
43 KiB
C
1922 lines
43 KiB
C
/*
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* IP multicast routing support for mrouted 3.6/3.8
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*
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* (c) 1995 Alan Cox, <alan@redhat.com>
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* Linux Consultancy and Custom Driver Development
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Version: $Id: ipmr.c,v 1.65 2001/10/31 21:55:54 davem Exp $
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*
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* Fixes:
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* Michael Chastain : Incorrect size of copying.
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* Alan Cox : Added the cache manager code
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* Alan Cox : Fixed the clone/copy bug and device race.
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* Mike McLagan : Routing by source
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* Malcolm Beattie : Buffer handling fixes.
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* Alexey Kuznetsov : Double buffer free and other fixes.
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* SVR Anand : Fixed several multicast bugs and problems.
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* Alexey Kuznetsov : Status, optimisations and more.
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* Brad Parker : Better behaviour on mrouted upcall
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* overflow.
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* Carlos Picoto : PIMv1 Support
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* Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header
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* Relax this requrement to work with older peers.
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*
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*/
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <linux/types.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/igmp.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/mroute.h>
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#include <linux/init.h>
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#include <linux/if_ether.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/route.h>
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#include <net/sock.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/raw.h>
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#include <linux/notifier.h>
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#include <linux/if_arp.h>
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#include <linux/netfilter_ipv4.h>
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#include <net/ipip.h>
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#include <net/checksum.h>
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#include <net/netlink.h>
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#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
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#define CONFIG_IP_PIMSM 1
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#endif
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static struct sock *mroute_socket;
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/* Big lock, protecting vif table, mrt cache and mroute socket state.
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Note that the changes are semaphored via rtnl_lock.
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*/
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static DEFINE_RWLOCK(mrt_lock);
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/*
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* Multicast router control variables
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*/
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static struct vif_device vif_table[MAXVIFS]; /* Devices */
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static int maxvif;
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#define VIF_EXISTS(idx) (vif_table[idx].dev != NULL)
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static int mroute_do_assert; /* Set in PIM assert */
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static int mroute_do_pim;
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static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */
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static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */
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static atomic_t cache_resolve_queue_len; /* Size of unresolved */
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/* Special spinlock for queue of unresolved entries */
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static DEFINE_SPINLOCK(mfc_unres_lock);
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/* We return to original Alan's scheme. Hash table of resolved
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entries is changed only in process context and protected
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with weak lock mrt_lock. Queue of unresolved entries is protected
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with strong spinlock mfc_unres_lock.
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In this case data path is free of exclusive locks at all.
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*/
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static struct kmem_cache *mrt_cachep __read_mostly;
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static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local);
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static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert);
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static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm);
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#ifdef CONFIG_IP_PIMSM_V2
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static struct net_protocol pim_protocol;
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#endif
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static struct timer_list ipmr_expire_timer;
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/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
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static
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struct net_device *ipmr_new_tunnel(struct vifctl *v)
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{
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struct net_device *dev;
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dev = __dev_get_by_name("tunl0");
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if (dev) {
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int err;
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struct ifreq ifr;
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mm_segment_t oldfs;
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struct ip_tunnel_parm p;
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struct in_device *in_dev;
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memset(&p, 0, sizeof(p));
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p.iph.daddr = v->vifc_rmt_addr.s_addr;
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p.iph.saddr = v->vifc_lcl_addr.s_addr;
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p.iph.version = 4;
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p.iph.ihl = 5;
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p.iph.protocol = IPPROTO_IPIP;
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sprintf(p.name, "dvmrp%d", v->vifc_vifi);
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ifr.ifr_ifru.ifru_data = (void*)&p;
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oldfs = get_fs(); set_fs(KERNEL_DS);
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err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
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set_fs(oldfs);
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dev = NULL;
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if (err == 0 && (dev = __dev_get_by_name(p.name)) != NULL) {
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dev->flags |= IFF_MULTICAST;
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in_dev = __in_dev_get_rtnl(dev);
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if (in_dev == NULL && (in_dev = inetdev_init(dev)) == NULL)
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goto failure;
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in_dev->cnf.rp_filter = 0;
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if (dev_open(dev))
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goto failure;
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}
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}
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return dev;
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failure:
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/* allow the register to be completed before unregistering. */
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rtnl_unlock();
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rtnl_lock();
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unregister_netdevice(dev);
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return NULL;
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}
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#ifdef CONFIG_IP_PIMSM
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static int reg_vif_num = -1;
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static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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read_lock(&mrt_lock);
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((struct net_device_stats*)netdev_priv(dev))->tx_bytes += skb->len;
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((struct net_device_stats*)netdev_priv(dev))->tx_packets++;
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ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT);
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read_unlock(&mrt_lock);
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kfree_skb(skb);
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return 0;
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}
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static struct net_device_stats *reg_vif_get_stats(struct net_device *dev)
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{
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return (struct net_device_stats*)netdev_priv(dev);
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}
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static void reg_vif_setup(struct net_device *dev)
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{
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dev->type = ARPHRD_PIMREG;
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dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
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dev->flags = IFF_NOARP;
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dev->hard_start_xmit = reg_vif_xmit;
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dev->get_stats = reg_vif_get_stats;
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dev->destructor = free_netdev;
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}
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static struct net_device *ipmr_reg_vif(void)
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{
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struct net_device *dev;
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struct in_device *in_dev;
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dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg",
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reg_vif_setup);
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if (dev == NULL)
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return NULL;
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if (register_netdevice(dev)) {
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free_netdev(dev);
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return NULL;
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}
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dev->iflink = 0;
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if ((in_dev = inetdev_init(dev)) == NULL)
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goto failure;
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in_dev->cnf.rp_filter = 0;
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if (dev_open(dev))
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goto failure;
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return dev;
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failure:
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/* allow the register to be completed before unregistering. */
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rtnl_unlock();
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rtnl_lock();
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unregister_netdevice(dev);
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return NULL;
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}
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#endif
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/*
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* Delete a VIF entry
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*/
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static int vif_delete(int vifi)
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{
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struct vif_device *v;
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struct net_device *dev;
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struct in_device *in_dev;
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if (vifi < 0 || vifi >= maxvif)
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return -EADDRNOTAVAIL;
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v = &vif_table[vifi];
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write_lock_bh(&mrt_lock);
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dev = v->dev;
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v->dev = NULL;
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if (!dev) {
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write_unlock_bh(&mrt_lock);
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return -EADDRNOTAVAIL;
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}
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#ifdef CONFIG_IP_PIMSM
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if (vifi == reg_vif_num)
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reg_vif_num = -1;
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#endif
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if (vifi+1 == maxvif) {
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int tmp;
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for (tmp=vifi-1; tmp>=0; tmp--) {
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if (VIF_EXISTS(tmp))
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break;
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}
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maxvif = tmp+1;
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}
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write_unlock_bh(&mrt_lock);
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dev_set_allmulti(dev, -1);
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if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
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in_dev->cnf.mc_forwarding--;
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ip_rt_multicast_event(in_dev);
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}
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if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER))
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unregister_netdevice(dev);
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dev_put(dev);
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return 0;
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}
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/* Destroy an unresolved cache entry, killing queued skbs
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and reporting error to netlink readers.
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*/
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static void ipmr_destroy_unres(struct mfc_cache *c)
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{
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struct sk_buff *skb;
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struct nlmsgerr *e;
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atomic_dec(&cache_resolve_queue_len);
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while ((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) {
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if (ip_hdr(skb)->version == 0) {
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struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
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nlh->nlmsg_type = NLMSG_ERROR;
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nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
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skb_trim(skb, nlh->nlmsg_len);
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e = NLMSG_DATA(nlh);
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e->error = -ETIMEDOUT;
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memset(&e->msg, 0, sizeof(e->msg));
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rtnl_unicast(skb, NETLINK_CB(skb).pid);
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} else
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kfree_skb(skb);
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}
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kmem_cache_free(mrt_cachep, c);
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}
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/* Single timer process for all the unresolved queue. */
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static void ipmr_expire_process(unsigned long dummy)
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{
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unsigned long now;
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unsigned long expires;
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struct mfc_cache *c, **cp;
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if (!spin_trylock(&mfc_unres_lock)) {
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mod_timer(&ipmr_expire_timer, jiffies+HZ/10);
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return;
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}
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if (atomic_read(&cache_resolve_queue_len) == 0)
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goto out;
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now = jiffies;
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expires = 10*HZ;
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cp = &mfc_unres_queue;
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while ((c=*cp) != NULL) {
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if (time_after(c->mfc_un.unres.expires, now)) {
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unsigned long interval = c->mfc_un.unres.expires - now;
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if (interval < expires)
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expires = interval;
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cp = &c->next;
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continue;
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}
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*cp = c->next;
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ipmr_destroy_unres(c);
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}
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if (atomic_read(&cache_resolve_queue_len))
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mod_timer(&ipmr_expire_timer, jiffies + expires);
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out:
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spin_unlock(&mfc_unres_lock);
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}
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/* Fill oifs list. It is called under write locked mrt_lock. */
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static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls)
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{
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int vifi;
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cache->mfc_un.res.minvif = MAXVIFS;
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cache->mfc_un.res.maxvif = 0;
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memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
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for (vifi=0; vifi<maxvif; vifi++) {
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if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) {
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cache->mfc_un.res.ttls[vifi] = ttls[vifi];
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if (cache->mfc_un.res.minvif > vifi)
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cache->mfc_un.res.minvif = vifi;
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if (cache->mfc_un.res.maxvif <= vifi)
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cache->mfc_un.res.maxvif = vifi + 1;
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}
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}
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}
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static int vif_add(struct vifctl *vifc, int mrtsock)
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{
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int vifi = vifc->vifc_vifi;
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struct vif_device *v = &vif_table[vifi];
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struct net_device *dev;
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struct in_device *in_dev;
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/* Is vif busy ? */
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if (VIF_EXISTS(vifi))
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return -EADDRINUSE;
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switch (vifc->vifc_flags) {
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#ifdef CONFIG_IP_PIMSM
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case VIFF_REGISTER:
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/*
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* Special Purpose VIF in PIM
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* All the packets will be sent to the daemon
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*/
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if (reg_vif_num >= 0)
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return -EADDRINUSE;
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dev = ipmr_reg_vif();
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if (!dev)
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return -ENOBUFS;
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break;
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#endif
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case VIFF_TUNNEL:
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dev = ipmr_new_tunnel(vifc);
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if (!dev)
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return -ENOBUFS;
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break;
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case 0:
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dev = ip_dev_find(vifc->vifc_lcl_addr.s_addr);
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if (!dev)
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return -EADDRNOTAVAIL;
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dev_put(dev);
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break;
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default:
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return -EINVAL;
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}
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if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
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return -EADDRNOTAVAIL;
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in_dev->cnf.mc_forwarding++;
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dev_set_allmulti(dev, +1);
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ip_rt_multicast_event(in_dev);
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|
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/*
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* Fill in the VIF structures
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*/
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v->rate_limit=vifc->vifc_rate_limit;
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v->local=vifc->vifc_lcl_addr.s_addr;
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v->remote=vifc->vifc_rmt_addr.s_addr;
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v->flags=vifc->vifc_flags;
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if (!mrtsock)
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v->flags |= VIFF_STATIC;
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v->threshold=vifc->vifc_threshold;
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v->bytes_in = 0;
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v->bytes_out = 0;
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v->pkt_in = 0;
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v->pkt_out = 0;
|
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v->link = dev->ifindex;
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if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER))
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v->link = dev->iflink;
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|
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/* And finish update writing critical data */
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write_lock_bh(&mrt_lock);
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dev_hold(dev);
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v->dev=dev;
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#ifdef CONFIG_IP_PIMSM
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if (v->flags&VIFF_REGISTER)
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reg_vif_num = vifi;
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#endif
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if (vifi+1 > maxvif)
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maxvif = vifi+1;
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write_unlock_bh(&mrt_lock);
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return 0;
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}
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|
|
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static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp)
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{
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int line=MFC_HASH(mcastgrp,origin);
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struct mfc_cache *c;
|
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|
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for (c=mfc_cache_array[line]; c; c = c->next) {
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if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp)
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break;
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}
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return c;
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}
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|
|
|
/*
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* Allocate a multicast cache entry
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*/
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static struct mfc_cache *ipmr_cache_alloc(void)
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{
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struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
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if (c==NULL)
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return NULL;
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c->mfc_un.res.minvif = MAXVIFS;
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return c;
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}
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|
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static struct mfc_cache *ipmr_cache_alloc_unres(void)
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{
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struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
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if (c==NULL)
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return NULL;
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skb_queue_head_init(&c->mfc_un.unres.unresolved);
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c->mfc_un.unres.expires = jiffies + 10*HZ;
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return c;
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}
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|
|
/*
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* A cache entry has gone into a resolved state from queued
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|
*/
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|
|
|
static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c)
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{
|
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struct sk_buff *skb;
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struct nlmsgerr *e;
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|
|
/*
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* Play the pending entries through our router
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|
*/
|
|
|
|
while ((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) {
|
|
if (ip_hdr(skb)->version == 0) {
|
|
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_pointer(skb) -
|
|
(u8 *)nlh);
|
|
} else {
|
|
nlh->nlmsg_type = NLMSG_ERROR;
|
|
nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
e = NLMSG_DATA(nlh);
|
|
e->error = -EMSGSIZE;
|
|
memset(&e->msg, 0, sizeof(e->msg));
|
|
}
|
|
|
|
rtnl_unicast(skb, NETLINK_CB(skb).pid);
|
|
} 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;
|
|
const int ihl = ip_hdrlen(pkt);
|
|
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" :-)
|
|
*/
|
|
skb_push(skb, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb);
|
|
skb_reset_transport_header(skb);
|
|
msg = (struct igmpmsg *)skb_network_header(skb);
|
|
memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
|
|
msg->im_msgtype = IGMPMSG_WHOLEPKT;
|
|
msg->im_mbz = 0;
|
|
msg->im_vif = reg_vif_num;
|
|
ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
|
|
ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
|
|
sizeof(struct iphdr));
|
|
} else
|
|
#endif
|
|
{
|
|
|
|
/*
|
|
* Copy the IP header
|
|
*/
|
|
|
|
skb->network_header = skb->tail;
|
|
skb_put(skb, ihl);
|
|
skb_copy_to_linear_data(skb, pkt->data, ihl);
|
|
ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */
|
|
msg = (struct igmpmsg *)skb_network_header(skb);
|
|
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;
|
|
ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
|
|
skb->transport_header = skb->network_header;
|
|
}
|
|
|
|
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;
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
for (c=mfc_unres_queue; c; c=c->next) {
|
|
if (c->mfc_mcastgrp == iph->daddr &&
|
|
c->mfc_origin == 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 = iph->saddr;
|
|
c->mfc_mcastgrp = 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_thresholds(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_thresholds(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, __be32 saddr, __be32 daddr)
|
|
{
|
|
struct iphdr *iph;
|
|
struct iphdr *old_iph = ip_hdr(skb);
|
|
|
|
skb_push(skb, sizeof(struct iphdr));
|
|
skb->transport_header = skb->network_header;
|
|
skb_reset_network_header(skb);
|
|
iph = ip_hdr(skb);
|
|
|
|
iph->version = 4;
|
|
iph->tos = old_iph->tos;
|
|
iph->ttl = old_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);
|
|
|
|
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)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
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*)netdev_priv(vif->dev))->tx_bytes += skb->len;
|
|
((struct net_device_stats*)netdev_priv(vif->dev))->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;
|
|
ip_decrease_ttl(ip_hdr(skb));
|
|
|
|
/* 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 *)netdev_priv(vif->dev))->stat.tx_packets++;
|
|
((struct ip_tunnel *)netdev_priv(vif->dev))->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 (ip_hdr(skb)->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 (ip_hdr(skb)->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) {
|
|
nf_reset(skb);
|
|
raw_rcv(mroute_socket, skb);
|
|
read_unlock(&mrt_lock);
|
|
return 0;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
}
|
|
}
|
|
|
|
read_lock(&mrt_lock);
|
|
cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->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 = igmp_hdr(skb);
|
|
|
|
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_transport_header(skb) +
|
|
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_header = skb->network_header;
|
|
skb_pull(skb, (u8*)encap - skb->data);
|
|
skb_reset_network_header(skb);
|
|
skb->dev = reg_dev;
|
|
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*)netdev_priv(reg_dev))->rx_bytes += skb->len;
|
|
((struct net_device_stats*)netdev_priv(reg_dev))->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_transport_header(skb);
|
|
if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) ||
|
|
(pim->flags&PIM_NULL_REGISTER) ||
|
|
(ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
|
|
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_transport_header(skb) +
|
|
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_header = skb->network_header;
|
|
skb_pull(skb, (u8*)encap - skb->data);
|
|
skb_reset_network_header(skb);
|
|
skb->dev = reg_dev;
|
|
skb->protocol = htons(ETH_P_IP);
|
|
skb->ip_summed = 0;
|
|
skb->pkt_type = PACKET_HOST;
|
|
dst_release(skb->dst);
|
|
((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len;
|
|
((struct net_device_stats*)netdev_priv(reg_dev))->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_pointer(skb);
|
|
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_pointer(skb) - (u8 *)mp_head;
|
|
rtm->rtm_type = RTN_MULTICAST;
|
|
return 1;
|
|
|
|
rtattr_failure:
|
|
nlmsg_trim(skb, b);
|
|
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 sk_buff *skb2;
|
|
struct iphdr *iph;
|
|
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;
|
|
}
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2) {
|
|
read_unlock(&mrt_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
skb_push(skb2, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb2);
|
|
iph = ip_hdr(skb2);
|
|
iph->ihl = sizeof(struct iphdr) >> 2;
|
|
iph->saddr = rt->rt_src;
|
|
iph->daddr = rt->rt_dst;
|
|
iph->version = 0;
|
|
err = ipmr_cache_unresolved(vif, skb2);
|
|
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 const 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 const 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 const 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 const 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|SLAB_PANIC,
|
|
NULL, NULL);
|
|
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
|
|
}
|