[IPV6] MROUTE: Support multicast forwarding.
YOSHIFUJI Hideaki [Thu, 3 Apr 2008 00:22:53 +0000 (09:22 +0900)]
Based on ancient patch by Mickael Hoerdt
<hoerdt@clarinet.u-strasbg.fr>, which is available at
<http://www-r2.u-strasbg.fr/~hoerdt/dev/linux_ipv6_mforwarding/patch-linux-ipv6-mforwarding-0.1a>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

13 files changed:
include/linux/Kbuild
include/linux/ipv6.h
include/linux/mroute6.h [new file with mode: 0644]
net/ipv6/Kconfig
net/ipv6/Makefile
net/ipv6/addrconf.c
net/ipv6/af_inet6.c
net/ipv6/ip6_input.c
net/ipv6/ip6_output.c
net/ipv6/ip6mr.c [new file with mode: 0644]
net/ipv6/ipv6_sockglue.c
net/ipv6/raw.c
net/ipv6/route.c

index 84736ac..29ab9b9 100644 (file)
@@ -261,6 +261,7 @@ unifdef-y += mempolicy.h
 unifdef-y += mii.h
 unifdef-y += mman.h
 unifdef-y += mroute.h
+unifdef-y += mroute6.h
 unifdef-y += msdos_fs.h
 unifdef-y += msg.h
 unifdef-y += nbd.h
index b90d3d4..f53e476 100644 (file)
@@ -160,6 +160,9 @@ struct ipv6_devconf {
 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
        __s32           optimistic_dad;
 #endif
+#ifdef CONFIG_IPV6_MROUTE
+       __s32           mc_forwarding;
+#endif
        void            *sysctl;
 };
 
@@ -190,6 +193,7 @@ enum {
        DEVCONF_PROXY_NDP,
        DEVCONF_OPTIMISTIC_DAD,
        DEVCONF_ACCEPT_SOURCE_ROUTE,
+       DEVCONF_MC_FORWARDING,
        DEVCONF_MAX
 };
 
@@ -230,6 +234,7 @@ struct inet6_skb_parm {
 #endif
 
 #define IP6SKB_XFRM_TRANSFORMED        1
+#define IP6SKB_FORWARDED       2
 };
 
 #define IP6CB(skb)     ((struct inet6_skb_parm*)((skb)->cb))
diff --git a/include/linux/mroute6.h b/include/linux/mroute6.h
new file mode 100644 (file)
index 0000000..b921903
--- /dev/null
@@ -0,0 +1,227 @@
+#ifndef __LINUX_MROUTE6_H
+#define __LINUX_MROUTE6_H
+
+#include <linux/types.h>
+#include <linux/sockios.h>
+
+/*
+ *     Based on the MROUTING 3.5 defines primarily to keep
+ *     source compatibility with BSD.
+ *
+ *     See the pim6sd code for the original history.
+ *
+ *      Protocol Independent Multicast (PIM) data structures included
+ *      Carlos Picoto (cap@di.fc.ul.pt)
+ *
+ */
+
+#define MRT6_BASE      200
+#define MRT6_INIT      (MRT6_BASE)     /* Activate the kernel mroute code      */
+#define MRT6_DONE      (MRT6_BASE+1)   /* Shutdown the kernel mroute           */
+#define MRT6_ADD_MIF   (MRT6_BASE+2)   /* Add a virtual interface              */
+#define MRT6_DEL_MIF   (MRT6_BASE+3)   /* Delete a virtual interface           */
+#define MRT6_ADD_MFC   (MRT6_BASE+4)   /* Add a multicast forwarding entry     */
+#define MRT6_DEL_MFC   (MRT6_BASE+5)   /* Delete a multicast forwarding entry  */
+#define MRT6_VERSION   (MRT6_BASE+6)   /* Get the kernel multicast version     */
+
+#define SIOCGETMIFCNT_IN6      SIOCPROTOPRIVATE        /* IP protocol privates */
+#define SIOCGETSGCNT_IN6       (SIOCPROTOPRIVATE+1)
+#define SIOCGETRPF     (SIOCPROTOPRIVATE+2)
+
+#define MAXMIFS                32
+typedef unsigned long mifbitmap_t;     /* User mode code depends on this lot */
+typedef unsigned short mifi_t;
+#define ALL_MIFS       ((mifi_t)(-1))
+
+#ifndef IF_SETSIZE
+#define IF_SETSIZE     256
+#endif
+
+typedef        __u32           if_mask;
+#define NIFBITS (sizeof(if_mask) * 8)        /* bits per mask */
+
+#if !defined(__KERNEL__) && !defined(DIV_ROUND_UP)
+#define        DIV_ROUND_UP(x,y)       (((x) + ((y) - 1)) / (y))
+#endif
+
+typedef struct if_set {
+       if_mask ifs_bits[DIV_ROUND_UP(IF_SETSIZE, NIFBITS)];
+} if_set;
+
+#define IF_SET(n, p)    ((p)->ifs_bits[(n)/NIFBITS] |= (1 << ((n) % NIFBITS)))
+#define IF_CLR(n, p)    ((p)->ifs_bits[(n)/NIFBITS] &= ~(1 << ((n) % NIFBITS)))
+#define IF_ISSET(n, p)  ((p)->ifs_bits[(n)/NIFBITS] & (1 << ((n) % NIFBITS)))
+#define IF_COPY(f, t)   bcopy(f, t, sizeof(*(f)))
+#define IF_ZERO(p)      bzero(p, sizeof(*(p)))
+
+/*
+ *     Passed by mrouted for an MRT_ADD_MIF - again we use the
+ *     mrouted 3.6 structures for compatibility
+ */
+
+struct mif6ctl {
+       mifi_t  mif6c_mifi;             /* Index of MIF */
+       unsigned char mif6c_flags;      /* MIFF_ flags */
+       unsigned char vifc_threshold;   /* ttl limit */
+       u_short  mif6c_pifi;            /* the index of the physical IF */
+       unsigned int vifc_rate_limit;   /* Rate limiter values (NI) */
+};
+
+#define MIFF_REGISTER  0x1     /* register vif */
+
+/*
+ *     Cache manipulation structures for mrouted and PIMd
+ */
+
+struct mf6cctl
+{
+       struct sockaddr_in6 mf6cc_origin;               /* Origin of mcast      */
+       struct sockaddr_in6 mf6cc_mcastgrp;             /* Group in question    */
+       mifi_t  mf6cc_parent;                   /* Where it arrived     */
+       struct if_set mf6cc_ifset;              /* Where it is going */
+};
+
+/*
+ *     Group count retrieval for pim6sd
+ */
+
+struct sioc_sg_req6
+{
+       struct sockaddr_in6 src;
+       struct sockaddr_in6 grp;
+       unsigned long pktcnt;
+       unsigned long bytecnt;
+       unsigned long wrong_if;
+};
+
+/*
+ *     To get vif packet counts
+ */
+
+struct sioc_mif_req6
+{
+       mifi_t  mifi;           /* Which iface */
+       unsigned long icount;   /* In packets */
+       unsigned long ocount;   /* Out packets */
+       unsigned long ibytes;   /* In bytes */
+       unsigned long obytes;   /* Out bytes */
+};
+
+/*
+ *     That's all usermode folks
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/skbuff.h>      /* for struct sk_buff_head */
+
+struct net_device;
+struct inet6_dev *ipv6_find_idev(struct net_device *dev);
+
+#ifdef CONFIG_IPV6_MROUTE
+static inline int ip6_mroute_opt(int opt)
+{
+       return (opt >= MRT6_BASE) && (opt <= MRT6_BASE + 10);
+}
+#else
+static inline int ip6_mroute_opt(int opt)
+{
+       return 0;
+}
+#endif
+
+struct sock;
+
+extern int ip6_mroute_setsockopt(struct sock *, int, char __user *, int);
+extern int ip6_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
+extern int ip6_mr_input(struct sk_buff *skb);
+extern int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg);
+extern void ip6_mr_init(void);
+
+struct mif_device
+{
+       struct net_device       *dev;                   /* Device we are using */
+       unsigned long   bytes_in,bytes_out;
+       unsigned long   pkt_in,pkt_out;         /* Statistics                   */
+       unsigned long   rate_limit;             /* Traffic shaping (NI)         */
+       unsigned char   threshold;              /* TTL threshold                */
+       unsigned short  flags;                  /* Control flags                */
+       int             link;                   /* Physical interface index     */
+};
+
+#define VIFF_STATIC 0x8000
+
+struct mfc6_cache
+{
+       struct mfc6_cache *next;                /* Next entry on cache line     */
+       struct in6_addr mf6c_mcastgrp;                  /* Group the entry belongs to   */
+       struct in6_addr mf6c_origin;                    /* Source of packet             */
+       mifi_t mf6c_parent;                     /* Source interface             */
+       int mfc_flags;                          /* Flags on line                */
+
+       union {
+               struct {
+                       unsigned long expires;
+                       struct sk_buff_head unresolved; /* Unresolved buffers           */
+               } unres;
+               struct {
+                       unsigned long last_assert;
+                       int minvif;
+                       int maxvif;
+                       unsigned long bytes;
+                       unsigned long pkt;
+                       unsigned long wrong_if;
+                       unsigned char ttls[MAXMIFS];    /* TTL thresholds               */
+               } res;
+       } mfc_un;
+};
+
+#define MFC_STATIC             1
+#define MFC_NOTIFY             2
+
+#define MFC6_LINES             64
+
+#define MFC6_HASH(a, g) (((__force u32)(a)->s6_addr32[0] ^ \
+                         (__force u32)(a)->s6_addr32[1] ^ \
+                         (__force u32)(a)->s6_addr32[2] ^ \
+                         (__force u32)(a)->s6_addr32[3] ^ \
+                         (__force u32)(g)->s6_addr32[0] ^ \
+                         (__force u32)(g)->s6_addr32[1] ^ \
+                         (__force u32)(g)->s6_addr32[2] ^ \
+                         (__force u32)(g)->s6_addr32[3]) % MFC6_LINES)
+
+#define MFC_ASSERT_THRESH (3*HZ)               /* Maximal freq. of asserts */
+
+#endif
+
+#ifdef __KERNEL__
+struct rtmsg;
+extern int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait);
+
+#ifdef CONFIG_IPV6_MROUTE
+extern struct sock *mroute6_socket;
+extern int ip6mr_sk_done(struct sock *sk);
+#else
+#define mroute6_socket NULL
+static inline int ip6mr_sk_done(struct sock *sk) { return 0; }
+#endif
+#endif
+
+/*
+ * Structure used to communicate from kernel to multicast router.
+ * We'll overlay the structure onto an MLD header (not an IPv6 heder like igmpmsg{}
+ * used for IPv4 implementation). This is because this structure will be passed via an
+ * IPv6 raw socket, on wich an application will only receiver the payload i.e the data after
+ * the IPv6 header and all the extension headers. (See section 3 of RFC 3542)
+ */
+
+struct mrt6msg {
+#define MRT6MSG_NOCACHE                1
+       __u8            im6_mbz;                /* must be zero            */
+       __u8            im6_msgtype;            /* what type of message    */
+       __u16           im6_mif;                /* mif rec'd on            */
+       __u32           im6_pad;                /* padding for 64 bit arch */
+       struct in6_addr im6_src, im6_dst;
+};
+
+#endif
index 47263e4..9a2ea81 100644 (file)
@@ -209,3 +209,10 @@ config IPV6_SUBTREES
 
          If unsure, say N.
 
+config IPV6_MROUTE
+       bool "IPv6: multicast routing (EXPERIMENTAL)"
+       depends on IPV6 && EXPERIMENTAL
+       ---help---
+         Experimental support for IPv6 multicast forwarding.
+         If unsure, say N.
+
index ae14617..686934a 100644 (file)
@@ -11,6 +11,8 @@ ipv6-objs :=  af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
                exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o
 
 ipv6-$(CONFIG_SYSCTL) = sysctl_net_ipv6.o
+ipv6-$(CONFIG_IPV6_MROUTE) += ip6mr.o
+
 ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
        xfrm6_output.o
 ipv6-$(CONFIG_NETFILTER) += netfilter.o
index 1103761..dbc51af 100644 (file)
@@ -412,7 +412,7 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
        return ndev;
 }
 
-static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
+struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 {
        struct inet6_dev *idev;
 
@@ -3547,6 +3547,9 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
        array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
 #endif
+#ifdef CONFIG_IPV6_MROUTE
+       array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
+#endif
 }
 
 static inline size_t inet6_if_nlmsg_size(void)
@@ -4095,6 +4098,16 @@ static struct addrconf_sysctl_table
 
                },
 #endif
+#ifdef CONFIG_IPV6_MROUTE
+               {
+                       .ctl_name       =       CTL_UNNUMBERED,
+                       .procname       =       "mc_forwarding",
+                       .data           =       &ipv6_devconf.mc_forwarding,
+                       .maxlen         =       sizeof(int),
+                       .mode           =       0644,
+                       .proc_handler   =       &proc_dointvec,
+               },
+#endif
                {
                        .ctl_name       =       0,      /* sentinel */
                }
index 1731b0a..3c6aafb 100644 (file)
@@ -61,6 +61,9 @@
 
 #include <asm/uaccess.h>
 #include <asm/system.h>
+#ifdef CONFIG_IPV6_MROUTE
+#include <linux/mroute6.h>
+#endif
 
 MODULE_AUTHOR("Cast of dozens");
 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
@@ -953,6 +956,9 @@ static int __init inet6_init(void)
        err = icmpv6_init();
        if (err)
                goto icmp_fail;
+#ifdef CONFIG_IPV6_MROUTE
+       ip6_mr_init();
+#endif
        err = ndisc_init();
        if (err)
                goto ndisc_fail;
index 43a617e..09a3201 100644 (file)
@@ -29,6 +29,7 @@
 #include <linux/netdevice.h>
 #include <linux/in6.h>
 #include <linux/icmpv6.h>
+#include <linux/mroute6.h>
 
 #include <linux/netfilter.h>
 #include <linux/netfilter_ipv6.h>
@@ -236,36 +237,84 @@ int ip6_mc_input(struct sk_buff *skb)
        hdr = ipv6_hdr(skb);
        deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
 
+#ifdef CONFIG_IPV6_MROUTE
        /*
-        *      IPv6 multicast router mode isnt currently supported.
+        *      IPv6 multicast router mode is now supported ;)
         */
-#if 0
-       if (ipv6_config.multicast_route) {
-               int addr_type;
-
-               addr_type = ipv6_addr_type(&hdr->daddr);
-
-               if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) {
-                       struct sk_buff *skb2;
-                       struct dst_entry *dst;
+       if (ipv6_devconf.mc_forwarding &&
+           likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
+               /*
+                * Okay, we try to forward - split and duplicate
+                * packets.
+                */
+               struct sk_buff *skb2;
+               struct inet6_skb_parm *opt = IP6CB(skb);
+
+               /* Check for MLD */
+               if (unlikely(opt->ra)) {
+                       /* Check if this is a mld message */
+                       u8 *ptr = skb_network_header(skb) + opt->ra;
+                       struct icmp6hdr *icmp6;
+                       u8 nexthdr = hdr->nexthdr;
+                       int offset;
+
+                       /* Check if the value of Router Alert
+                        * is for MLD (0x0000).
+                        */
+                       if ((ptr[2] | ptr[3]) == 0) {
+                               if (!ipv6_ext_hdr(nexthdr)) {
+                                       /* BUG */
+                                       goto discard;
+                               }
+                               offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
+                                                         &nexthdr);
+                               if (offset < 0)
+                                       goto discard;
+
+                               if (nexthdr != IPPROTO_ICMPV6)
+                                       goto discard;
+
+                               if (!pskb_may_pull(skb, (skb_network_header(skb) +
+                                                  offset + 1 - skb->data)))
+                                       goto discard;
+
+                               icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
+
+                               switch (icmp6->icmp6_type) {
+                               case ICMPV6_MGM_QUERY:
+                               case ICMPV6_MGM_REPORT:
+                               case ICMPV6_MGM_REDUCTION:
+                               case ICMPV6_MLD2_REPORT:
+                                       break;
+                               default:
+                                       /* Bogus */
+                                       goto discard;
+                               }
+                               deliver = 1;
+                               goto out;
+                       }
+                       /* unknown RA - process it normally */
+               }
 
-                       dst = skb->dst;
+               if (deliver)
+                       skb2 = skb_clone(skb, GFP_ATOMIC);
+               else {
+                       skb2 = skb;
+                       skb = NULL;
+               }
 
-                       if (deliver) {
-                               skb2 = skb_clone(skb, GFP_ATOMIC);
-                               dst_output(skb2);
-                       } else {
-                               dst_output(skb);
-                               return 0;
-                       }
+               if (skb2) {
+                       skb2->dev = skb2->dst->dev;
+                       ip6_mr_input(skb2);
                }
        }
 #endif
-
+out:
        if (likely(deliver)) {
                ip6_input(skb);
                return 0;
        }
+discard:
        /* discard */
        kfree_skb(skb);
 
index a8b4da2..c0dbe54 100644 (file)
@@ -55,6 +55,7 @@
 #include <net/icmp.h>
 #include <net/xfrm.h>
 #include <net/checksum.h>
+#include <linux/mroute6.h>
 
 static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 
@@ -137,8 +138,9 @@ static int ip6_output2(struct sk_buff *skb)
                struct inet6_dev *idev = ip6_dst_idev(skb->dst);
 
                if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) &&
-                   ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
-                                       &ipv6_hdr(skb)->saddr)) {
+                   ((mroute6_socket && !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
+                    ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
+                                        &ipv6_hdr(skb)->saddr))) {
                        struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
 
                        /* Do not check for IFF_ALLMULTI; multicast routing
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
new file mode 100644 (file)
index 0000000..1bdf3c1
--- /dev/null
@@ -0,0 +1,1384 @@
+/*
+ *     Linux IPv6 multicast routing support for BSD pim6sd
+ *     Based on net/ipv4/ipmr.c.
+ *
+ *     (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
+ *             LSIIT Laboratory, Strasbourg, France
+ *     (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
+ *             6WIND, Paris, France
+ *     Copyright (C)2007,2008 USAGI/WIDE Project
+ *             YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License
+ *     as published by the Free Software Foundation; either version
+ *     2 of the License, or (at your option) any later version.
+ *
+ */
+
+#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 <net/route.h>
+#include <linux/notifier.h>
+#include <linux/if_arp.h>
+#include <linux/netfilter_ipv4.h>
+#include <net/ipip.h>
+#include <net/checksum.h>
+#include <net/netlink.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <linux/mroute6.h>
+#include <net/addrconf.h>
+#include <linux/netfilter_ipv6.h>
+
+struct sock *mroute6_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 mif_device vif6_table[MAXMIFS];          /* Devices              */
+static int maxvif;
+
+#define MIF_EXISTS(idx) (vif6_table[idx].dev != NULL)
+
+static struct mfc6_cache *mfc6_cache_array[MFC_LINES]; /* Forwarding cache     */
+
+static struct mfc6_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 struct kmem_cache *mrt_cachep __read_mostly;
+
+static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache);
+static int ip6mr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert);
+static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm);
+
+static struct timer_list ipmr_expire_timer;
+
+
+#ifdef CONFIG_PROC_FS
+
+struct ipmr_mfc_iter {
+       struct mfc6_cache **cache;
+       int ct;
+};
+
+
+static struct mfc6_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos)
+{
+       struct mfc6_cache *mfc;
+
+       it->cache = mfc6_cache_array;
+       read_lock(&mrt_lock);
+       for (it->ct = 0; it->ct < ARRAY_SIZE(mfc6_cache_array); it->ct++)
+               for (mfc = mfc6_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;
+}
+
+
+
+
+/*
+ *     The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
+ */
+
+struct ipmr_vif_iter {
+       int ct;
+};
+
+static struct mif_device *ip6mr_vif_seq_idx(struct ipmr_vif_iter *iter,
+                                           loff_t pos)
+{
+       for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) {
+               if (!MIF_EXISTS(iter->ct))
+                       continue;
+               if (pos-- == 0)
+                       return &vif6_table[iter->ct];
+       }
+       return NULL;
+}
+
+static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
+       __acquires(mrt_lock)
+{
+       read_lock(&mrt_lock);
+       return (*pos ? ip6mr_vif_seq_idx(seq->private, *pos - 1)
+               : SEQ_START_TOKEN);
+}
+
+static void *ip6mr_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 ip6mr_vif_seq_idx(iter, 0);
+
+       while (++iter->ct < maxvif) {
+               if (!MIF_EXISTS(iter->ct))
+                       continue;
+               return &vif6_table[iter->ct];
+       }
+       return NULL;
+}
+
+static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
+       __releases(mrt_lock)
+{
+       read_unlock(&mrt_lock);
+}
+
+static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
+{
+       if (v == SEQ_START_TOKEN) {
+               seq_puts(seq,
+                        "Interface      BytesIn  PktsIn  BytesOut PktsOut Flags\n");
+       } else {
+               const struct mif_device *vif = v;
+               const char *name = vif->dev ? vif->dev->name : "none";
+
+               seq_printf(seq,
+                          "%2Zd %-10s %8ld %7ld  %8ld %7ld %05X\n",
+                          vif - vif6_table,
+                          name, vif->bytes_in, vif->pkt_in,
+                          vif->bytes_out, vif->pkt_out,
+                          vif->flags);
+       }
+       return 0;
+}
+
+static struct seq_operations ip6mr_vif_seq_ops = {
+       .start = ip6mr_vif_seq_start,
+       .next  = ip6mr_vif_seq_next,
+       .stop  = ip6mr_vif_seq_stop,
+       .show  = ip6mr_vif_seq_show,
+};
+
+static int ip6mr_vif_open(struct inode *inode, struct file *file)
+{
+       return seq_open_private(file, &ip6mr_vif_seq_ops,
+                               sizeof(struct ipmr_vif_iter));
+}
+
+static struct file_operations ip6mr_vif_fops = {
+       .owner   = THIS_MODULE,
+       .open    = ip6mr_vif_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+       .release = seq_release,
+};
+
+static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+       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 mfc6_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 != mfc6_cache_array);
+
+       while (++it->ct < ARRAY_SIZE(mfc6_cache_array)) {
+               mfc = mfc6_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 == mfc6_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 mfc6_cache *mfc = v;
+               const struct ipmr_mfc_iter *it = seq->private;
+
+               seq_printf(seq,
+                          NIP6_FMT " " NIP6_FMT " %-3d %8ld %8ld %8ld",
+                          NIP6(mfc->mf6c_mcastgrp), NIP6(mfc->mf6c_origin),
+                          mfc->mf6c_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 (MIF_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)
+{
+       return seq_open_private(file, &ipmr_mfc_seq_ops,
+                               sizeof(struct ipmr_mfc_iter));
+}
+
+static struct file_operations ip6mr_mfc_fops = {
+       .owner   = THIS_MODULE,
+       .open    = ipmr_mfc_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+       .release = seq_release,
+};
+#endif
+
+/*
+ *     Delete a VIF entry
+ */
+
+static int mif6_delete(int vifi)
+{
+       struct mif_device *v;
+       struct net_device *dev;
+       if (vifi < 0 || vifi >= maxvif)
+               return -EADDRNOTAVAIL;
+
+       v = &vif6_table[vifi];
+
+       write_lock_bh(&mrt_lock);
+       dev = v->dev;
+       v->dev = NULL;
+
+       if (!dev) {
+               write_unlock_bh(&mrt_lock);
+               return -EADDRNOTAVAIL;
+       }
+
+       if (vifi + 1 == maxvif) {
+               int tmp;
+               for (tmp = vifi - 1; tmp >= 0; tmp--) {
+                       if (MIF_EXISTS(tmp))
+                               break;
+               }
+               maxvif = tmp + 1;
+       }
+
+       write_unlock_bh(&mrt_lock);
+
+       dev_set_allmulti(dev, -1);
+
+       if (v->flags & MIFF_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 ip6mr_destroy_unres(struct mfc6_cache *c)
+{
+       struct sk_buff *skb;
+
+       atomic_dec(&cache_resolve_queue_len);
+
+       while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
+               if (ipv6_hdr(skb)->version == 0) {
+                       struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
+                       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;
+                       rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid);
+               } else
+                       kfree_skb(skb);
+       }
+
+       kmem_cache_free(mrt_cachep, c);
+}
+
+
+/* Single timer process for all the unresolved queue. */
+
+static void ipmr_do_expire_process(unsigned long dummy)
+{
+       unsigned long now = jiffies;
+       unsigned long expires = 10 * HZ;
+       struct mfc6_cache *c, **cp;
+
+       cp = &mfc_unres_queue;
+
+       while ((c = *cp) != NULL) {
+               if (time_after(c->mfc_un.unres.expires, now)) {
+                       /* not yet... */
+                       unsigned long interval = c->mfc_un.unres.expires - now;
+                       if (interval < expires)
+                               expires = interval;
+                       cp = &c->next;
+                       continue;
+               }
+
+               *cp = c->next;
+               ip6mr_destroy_unres(c);
+       }
+
+       if (atomic_read(&cache_resolve_queue_len))
+               mod_timer(&ipmr_expire_timer, jiffies + expires);
+}
+
+static void ipmr_expire_process(unsigned long dummy)
+{
+       if (!spin_trylock(&mfc_unres_lock)) {
+               mod_timer(&ipmr_expire_timer, jiffies + 1);
+               return;
+       }
+
+       if (atomic_read(&cache_resolve_queue_len))
+               ipmr_do_expire_process(dummy);
+
+       spin_unlock(&mfc_unres_lock);
+}
+
+/* Fill oifs list. It is called under write locked mrt_lock. */
+
+static void ip6mr_update_thresholds(struct mfc6_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 (MIF_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 mif6_add(struct mif6ctl *vifc, int mrtsock)
+{
+       int vifi = vifc->mif6c_mifi;
+       struct mif_device *v = &vif6_table[vifi];
+       struct net_device *dev;
+
+       /* Is vif busy ? */
+       if (MIF_EXISTS(vifi))
+               return -EADDRINUSE;
+
+       switch (vifc->mif6c_flags) {
+       case 0:
+               dev = dev_get_by_index(&init_net, vifc->mif6c_pifi);
+               if (!dev)
+                       return -EADDRNOTAVAIL;
+               dev_put(dev);
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       dev_set_allmulti(dev, 1);
+
+       /*
+        *      Fill in the VIF structures
+        */
+       v->rate_limit = vifc->vifc_rate_limit;
+       v->flags = vifc->mif6c_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 & MIFF_REGISTER)
+               v->link = dev->iflink;
+
+       /* And finish update writing critical data */
+       write_lock_bh(&mrt_lock);
+       dev_hold(dev);
+       v->dev = dev;
+       if (vifi + 1 > maxvif)
+               maxvif = vifi + 1;
+       write_unlock_bh(&mrt_lock);
+       return 0;
+}
+
+static struct mfc6_cache *ip6mr_cache_find(struct in6_addr *origin, struct in6_addr *mcastgrp)
+{
+       int line = MFC6_HASH(mcastgrp, origin);
+       struct mfc6_cache *c;
+
+       for (c = mfc6_cache_array[line]; c; c = c->next) {
+               if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
+                   ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
+                       break;
+       }
+       return c;
+}
+
+/*
+ *     Allocate a multicast cache entry
+ */
+static struct mfc6_cache *ip6mr_cache_alloc(void)
+{
+       struct mfc6_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 mfc6_cache *ip6mr_cache_alloc_unres(void)
+{
+       struct mfc6_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 ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c)
+{
+       struct sk_buff *skb;
+
+       /*
+        *      Play the pending entries through our router
+        */
+
+       while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
+               if (ipv6_hdr(skb)->version == 0) {
+                       int err;
+                       struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
+
+                       if (ip6mr_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 = rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid);
+               } else
+                       ip6_mr_forward(skb, c);
+       }
+}
+
+/*
+ *     Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
+ *     expects the following bizarre scheme.
+ *
+ *     Called under mrt_lock.
+ */
+
+static int ip6mr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
+{
+       struct sk_buff *skb;
+       struct mrt6msg *msg;
+       int ret;
+
+       skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
+
+       if (!skb)
+               return -ENOBUFS;
+
+       /* I suppose that internal messages
+        * do not require checksums */
+
+       skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+       /*
+        *      Copy the IP header
+        */
+
+       skb_put(skb, sizeof(struct ipv6hdr));
+       skb_reset_network_header(skb);
+       skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
+
+       /*
+        *      Add our header
+        */
+       skb_put(skb, sizeof(*msg));
+       skb_reset_transport_header(skb);
+       msg = (struct mrt6msg *)skb_transport_header(skb);
+
+       msg->im6_mbz = 0;
+       msg->im6_msgtype = assert;
+       msg->im6_mif = vifi;
+       msg->im6_pad = 0;
+       ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
+       ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
+
+       skb->dst = dst_clone(pkt->dst);
+       skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+       skb_pull(skb, sizeof(struct ipv6hdr));
+
+       if (mroute6_socket == NULL) {
+               kfree_skb(skb);
+               return -EINVAL;
+       }
+
+       /*
+        *      Deliver to user space multicast routing algorithms
+        */
+       if ((ret = sock_queue_rcv_skb(mroute6_socket, skb)) < 0) {
+               if (net_ratelimit())
+                       printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n");
+               kfree_skb(skb);
+       }
+
+       return ret;
+}
+
+/*
+ *     Queue a packet for resolution. It gets locked cache entry!
+ */
+
+static int
+ip6mr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
+{
+       int err;
+       struct mfc6_cache *c;
+
+       spin_lock_bh(&mfc_unres_lock);
+       for (c = mfc_unres_queue; c; c = c->next) {
+               if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
+                   ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr))
+                       break;
+       }
+
+       if (c == NULL) {
+               /*
+                *      Create a new entry if allowable
+                */
+
+               if (atomic_read(&cache_resolve_queue_len) >= 10 ||
+                   (c = ip6mr_cache_alloc_unres()) == NULL) {
+                       spin_unlock_bh(&mfc_unres_lock);
+
+                       kfree_skb(skb);
+                       return -ENOBUFS;
+               }
+
+               /*
+                *      Fill in the new cache entry
+                */
+               c->mf6c_parent = -1;
+               c->mf6c_origin = ipv6_hdr(skb)->saddr;
+               c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
+
+               /*
+                *      Reflect first query at pim6sd
+                */
+               if ((err = ip6mr_cache_report(skb, vifi, MRT6MSG_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;
+
+               ipmr_do_expire_process(1);
+       }
+
+       /*
+        *      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;
+}
+
+/*
+ *     MFC6 cache manipulation by user space
+ */
+
+static int ip6mr_mfc_delete(struct mf6cctl *mfc)
+{
+       int line;
+       struct mfc6_cache *c, **cp;
+
+       line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
+
+       for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) {
+               if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
+                   ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_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 ip6mr_device_event(struct notifier_block *this,
+                             unsigned long event, void *ptr)
+{
+       struct net_device *dev = ptr;
+       struct mif_device *v;
+       int ct;
+
+       if (dev_net(dev) != &init_net)
+               return NOTIFY_DONE;
+
+       if (event != NETDEV_UNREGISTER)
+               return NOTIFY_DONE;
+
+       v = &vif6_table[0];
+       for (ct = 0; ct < maxvif; ct++, v++) {
+               if (v->dev == dev)
+                       mif6_delete(ct);
+       }
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block ip6_mr_notifier = {
+       .notifier_call = ip6mr_device_event
+};
+
+/*
+ *     Setup for IP multicast routing
+ */
+
+void __init ip6_mr_init(void)
+{
+       mrt_cachep = kmem_cache_create("ip6_mrt_cache",
+                                      sizeof(struct mfc6_cache),
+                                      0, SLAB_HWCACHE_ALIGN,
+                                      NULL);
+       if (!mrt_cachep)
+               panic("cannot allocate ip6_mrt_cache");
+
+       setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0);
+       register_netdevice_notifier(&ip6_mr_notifier);
+#ifdef CONFIG_PROC_FS
+       proc_net_fops_create(&init_net, "ip6_mr_vif", 0, &ip6mr_vif_fops);
+       proc_net_fops_create(&init_net, "ip6_mr_cache", 0, &ip6mr_mfc_fops);
+#endif
+}
+
+
+static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock)
+{
+       int line;
+       struct mfc6_cache *uc, *c, **cp;
+       unsigned char ttls[MAXVIFS];
+       int i;
+
+       memset(ttls, 255, MAXVIFS);
+       for (i = 0; i < MAXVIFS; i++) {
+               if (IF_ISSET(i, &mfc->mf6cc_ifset))
+                       ttls[i] = 1;
+
+       }
+
+       line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
+
+       for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) {
+               if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
+                   ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr))
+                       break;
+       }
+
+       if (c != NULL) {
+               write_lock_bh(&mrt_lock);
+               c->mf6c_parent = mfc->mf6cc_parent;
+               ip6mr_update_thresholds(c, ttls);
+               if (!mrtsock)
+                       c->mfc_flags |= MFC_STATIC;
+               write_unlock_bh(&mrt_lock);
+               return 0;
+       }
+
+       if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
+               return -EINVAL;
+
+       c = ip6mr_cache_alloc();
+       if (c == NULL)
+               return -ENOMEM;
+
+       c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
+       c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
+       c->mf6c_parent = mfc->mf6cc_parent;
+       ip6mr_update_thresholds(c, ttls);
+       if (!mrtsock)
+               c->mfc_flags |= MFC_STATIC;
+
+       write_lock_bh(&mrt_lock);
+       c->next = mfc6_cache_array[line];
+       mfc6_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 (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
+                   ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_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) {
+               ip6mr_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 (!(vif6_table[i].flags & VIFF_STATIC))
+                       mif6_delete(i);
+       }
+
+       /*
+        *      Wipe the cache
+        */
+       for (i = 0; i < ARRAY_SIZE(mfc6_cache_array); i++) {
+               struct mfc6_cache *c, **cp;
+
+               cp = &mfc6_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 mfc6_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);
+
+                       ip6mr_destroy_unres(c);
+
+                       spin_lock_bh(&mfc_unres_lock);
+               }
+               spin_unlock_bh(&mfc_unres_lock);
+       }
+}
+
+static int ip6mr_sk_init(struct sock *sk)
+{
+       int err = 0;
+
+       rtnl_lock();
+       write_lock_bh(&mrt_lock);
+       if (likely(mroute6_socket == NULL))
+               mroute6_socket = sk;
+       else
+               err = -EADDRINUSE;
+       write_unlock_bh(&mrt_lock);
+
+       rtnl_unlock();
+
+       return err;
+}
+
+int ip6mr_sk_done(struct sock *sk)
+{
+       int err = 0;
+
+       rtnl_lock();
+       if (sk == mroute6_socket) {
+               write_lock_bh(&mrt_lock);
+               mroute6_socket = NULL;
+               write_unlock_bh(&mrt_lock);
+
+               mroute_clean_tables(sk);
+       } else
+               err = -EACCES;
+       rtnl_unlock();
+
+       return err;
+}
+
+/*
+ *     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 ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen)
+{
+       int ret;
+       struct mif6ctl vif;
+       struct mf6cctl mfc;
+       mifi_t mifi;
+
+       if (optname != MRT6_INIT) {
+               if (sk != mroute6_socket && !capable(CAP_NET_ADMIN))
+                       return -EACCES;
+       }
+
+       switch (optname) {
+       case MRT6_INIT:
+               if (sk->sk_type != SOCK_RAW ||
+                   inet_sk(sk)->num != IPPROTO_ICMPV6)
+                       return -EOPNOTSUPP;
+               if (optlen < sizeof(int))
+                       return -EINVAL;
+
+               return ip6mr_sk_init(sk);
+
+       case MRT6_DONE:
+               return ip6mr_sk_done(sk);
+
+       case MRT6_ADD_MIF:
+               if (optlen < sizeof(vif))
+                       return -EINVAL;
+               if (copy_from_user(&vif, optval, sizeof(vif)))
+                       return -EFAULT;
+               if (vif.mif6c_mifi >= MAXVIFS)
+                       return -ENFILE;
+               rtnl_lock();
+               ret = mif6_add(&vif, sk == mroute6_socket);
+               rtnl_unlock();
+               return ret;
+
+       case MRT6_DEL_MIF:
+               if (optlen < sizeof(mifi_t))
+                       return -EINVAL;
+               if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
+                       return -EFAULT;
+               rtnl_lock();
+               ret = mif6_delete(mifi);
+               rtnl_unlock();
+               return ret;
+
+       /*
+        *      Manipulate the forwarding caches. These live
+        *      in a sort of kernel/user symbiosis.
+        */
+       case MRT6_ADD_MFC:
+       case MRT6_DEL_MFC:
+               if (optlen < sizeof(mfc))
+                       return -EINVAL;
+               if (copy_from_user(&mfc, optval, sizeof(mfc)))
+                       return -EFAULT;
+               rtnl_lock();
+               if (optname == MRT6_DEL_MFC)
+                       ret = ip6mr_mfc_delete(&mfc);
+               else
+                       ret = ip6mr_mfc_add(&mfc, sk == mroute6_socket);
+               rtnl_unlock();
+               return ret;
+
+       /*
+        *      Spurious command, or MRT_VERSION which you cannot
+        *      set.
+        */
+       default:
+               return -ENOPROTOOPT;
+       }
+}
+
+/*
+ *     Getsock opt support for the multicast routing system.
+ */
+
+int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
+                         int __user *optlen)
+{
+       int olr;
+       int val;
+
+       switch (optname) {
+       case MRT6_VERSION:
+               val = 0x0305;
+               break;
+       default:
+               return -ENOPROTOOPT;
+       }
+
+       if (get_user(olr, optlen))
+               return -EFAULT;
+
+       olr = min_t(int, olr, sizeof(int));
+       if (olr < 0)
+               return -EINVAL;
+
+       if (put_user(olr, optlen))
+               return -EFAULT;
+       if (copy_to_user(optval, &val, olr))
+               return -EFAULT;
+       return 0;
+}
+
+/*
+ *     The IP multicast ioctl support routines.
+ */
+
+int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
+{
+       struct sioc_sg_req6 sr;
+       struct sioc_mif_req6 vr;
+       struct mif_device *vif;
+       struct mfc6_cache *c;
+
+       switch (cmd) {
+       case SIOCGETMIFCNT_IN6:
+               if (copy_from_user(&vr, arg, sizeof(vr)))
+                       return -EFAULT;
+               if (vr.mifi >= maxvif)
+                       return -EINVAL;
+               read_lock(&mrt_lock);
+               vif = &vif6_table[vr.mifi];
+               if (MIF_EXISTS(vr.mifi)) {
+                       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_IN6:
+               if (copy_from_user(&sr, arg, sizeof(sr)))
+                       return -EFAULT;
+
+               read_lock(&mrt_lock);
+               c = ip6mr_cache_find(&sr.src.sin6_addr, &sr.grp.sin6_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 inline int ip6mr_forward2_finish(struct sk_buff *skb)
+{
+       /* XXX stats */
+       return dst_output(skb);
+}
+
+/*
+ *     Processing handlers for ip6mr_forward
+ */
+
+static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi)
+{
+       struct ipv6hdr *ipv6h;
+       struct mif_device *vif = &vif6_table[vifi];
+       struct net_device *dev;
+       struct dst_entry *dst;
+       struct flowi fl;
+
+       if (vif->dev == NULL)
+               goto out_free;
+
+       ipv6h = ipv6_hdr(skb);
+
+       fl = (struct flowi) {
+               .oif = vif->link,
+               .nl_u = { .ip6_u =
+                               { .daddr = ipv6h->daddr, }
+               }
+       };
+
+       dst = ip6_route_output(&init_net, NULL, &fl);
+       if (!dst)
+               goto out_free;
+
+       dst_release(skb->dst);
+       skb->dst = dst;
+
+       /*
+        * 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.
+        */
+       dev = vif->dev;
+       skb->dev = dev;
+       vif->pkt_out++;
+       vif->bytes_out += skb->len;
+
+       /* We are about to write */
+       /* XXX: extension headers? */
+       if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
+               goto out_free;
+
+       ipv6h = ipv6_hdr(skb);
+       ipv6h->hop_limit--;
+
+       IP6CB(skb)->flags |= IP6SKB_FORWARDED;
+
+       return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dev,
+                      ip6mr_forward2_finish);
+
+out_free:
+       kfree_skb(skb);
+       return 0;
+}
+
+static int ip6mr_find_vif(struct net_device *dev)
+{
+       int ct;
+       for (ct = maxvif - 1; ct >= 0; ct--) {
+               if (vif6_table[ct].dev == dev)
+                       break;
+       }
+       return ct;
+}
+
+static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache)
+{
+       int psend = -1;
+       int vif, ct;
+
+       vif = cache->mf6c_parent;
+       cache->mfc_un.res.pkt++;
+       cache->mfc_un.res.bytes += skb->len;
+
+       vif6_table[vif].pkt_in++;
+       vif6_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 (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
+                       if (psend != -1) {
+                               struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+                               if (skb2)
+                                       ip6mr_forward2(skb2, cache, psend);
+                       }
+                       psend = ct;
+               }
+       }
+       if (psend != -1) {
+               ip6mr_forward2(skb, cache, psend);
+               return 0;
+       }
+
+       kfree_skb(skb);
+       return 0;
+}
+
+
+/*
+ *     Multicast packets for forwarding arrive here
+ */
+
+int ip6_mr_input(struct sk_buff *skb)
+{
+       struct mfc6_cache *cache;
+
+       read_lock(&mrt_lock);
+       cache = ip6mr_cache_find(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
+
+       /*
+        *      No usable cache entry
+        */
+       if (cache == NULL) {
+               int vif;
+
+               vif = ip6mr_find_vif(skb->dev);
+               if (vif >= 0) {
+                       int err = ip6mr_cache_unresolved(vif, skb);
+                       read_unlock(&mrt_lock);
+
+                       return err;
+               }
+               read_unlock(&mrt_lock);
+               kfree_skb(skb);
+               return -ENODEV;
+       }
+
+       ip6_mr_forward(skb, cache);
+
+       read_unlock(&mrt_lock);
+
+       return 0;
+}
+
+
+static int
+ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm)
+{
+       int ct;
+       struct rtnexthop *nhp;
+       struct net_device *dev = vif6_table[c->mf6c_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 = vif6_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:
+       nlmsg_trim(skb, b);
+       return -EMSGSIZE;
+}
+
+int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait)
+{
+       int err;
+       struct mfc6_cache *cache;
+       struct rt6_info *rt = (struct rt6_info *)skb->dst;
+
+       read_lock(&mrt_lock);
+       cache = ip6mr_cache_find(&rt->rt6i_src.addr, &rt->rt6i_dst.addr);
+
+       if (!cache) {
+               struct sk_buff *skb2;
+               struct ipv6hdr *iph;
+               struct net_device *dev;
+               int vif;
+
+               if (nowait) {
+                       read_unlock(&mrt_lock);
+                       return -EAGAIN;
+               }
+
+               dev = skb->dev;
+               if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) {
+                       read_unlock(&mrt_lock);
+                       return -ENODEV;
+               }
+
+               /* really correct? */
+               skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
+               if (!skb2) {
+                       read_unlock(&mrt_lock);
+                       return -ENOMEM;
+               }
+
+               skb_reset_transport_header(skb2);
+
+               skb_put(skb2, sizeof(struct ipv6hdr));
+               skb_reset_network_header(skb2);
+
+               iph = ipv6_hdr(skb2);
+               iph->version = 0;
+               iph->priority = 0;
+               iph->flow_lbl[0] = 0;
+               iph->flow_lbl[1] = 0;
+               iph->flow_lbl[2] = 0;
+               iph->payload_len = 0;
+               iph->nexthdr = IPPROTO_NONE;
+               iph->hop_limit = 0;
+               ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr);
+               ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr);
+
+               err = ip6mr_cache_unresolved(vif, skb2);
+               read_unlock(&mrt_lock);
+
+               return err;
+       }
+
+       if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
+               cache->mfc_flags |= MFC_NOTIFY;
+
+       err = ip6mr_fill_mroute(skb, cache, rtm);
+       read_unlock(&mrt_lock);
+       return err;
+}
+
index 4195ac9..9962410 100644 (file)
@@ -33,6 +33,7 @@
 #include <linux/sockios.h>
 #include <linux/net.h>
 #include <linux/in6.h>
+#include <linux/mroute6.h>
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
 #include <linux/init.h>
@@ -118,6 +119,9 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 
        valbool = (val!=0);
 
+       if (ip6_mroute_opt(optname))
+               return ip6_mroute_setsockopt(sk, optname, optval, optlen);
+
        lock_sock(sk);
 
        switch (optname) {
@@ -790,6 +794,9 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
        int len;
        int val;
 
+       if (ip6_mroute_opt(optname))
+               return ip6_mroute_getsockopt(sk, optname, optval, optlen);
+
        if (get_user(len, optlen))
                return -EFAULT;
        switch (optname) {
index aae6ced..088b80b 100644 (file)
@@ -53,6 +53,7 @@
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 #include <net/mip6.h>
 #endif
+#include <linux/mroute6.h>
 
 #include <net/raw.h>
 #include <net/rawv6.h>
@@ -1135,7 +1136,11 @@ static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
                }
 
                default:
+#ifdef CONFIG_IPV6_MROUTE
+                       return ip6mr_ioctl(sk, cmd, (void __user *)arg);
+#else
                        return -ENOIOCTLCMD;
+#endif
        }
 }
 
@@ -1143,7 +1148,7 @@ static void rawv6_close(struct sock *sk, long timeout)
 {
        if (inet_sk(sk)->num == IPPROTO_RAW)
                ip6_ra_control(sk, -1, NULL);
-
+       ip6mr_sk_done(sk);
        sk_common_release(sk);
 }
 
index cd82b6d..3c314d5 100644 (file)
@@ -36,6 +36,7 @@
 #include <linux/route.h>
 #include <linux/netdevice.h>
 #include <linux/in6.h>
+#include <linux/mroute6.h>
 #include <linux/init.h>
 #include <linux/if_arp.h>
 #include <linux/proc_fs.h>
@@ -2106,7 +2107,7 @@ static inline size_t rt6_nlmsg_size(void)
 static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
                         struct in6_addr *dst, struct in6_addr *src,
                         int iif, int type, u32 pid, u32 seq,
-                        int prefix, unsigned int flags)
+                        int prefix, int nowait, unsigned int flags)
 {
        struct rtmsg *rtm;
        struct nlmsghdr *nlh;
@@ -2166,9 +2167,24 @@ static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
        } else if (rtm->rtm_src_len)
                NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
 #endif
-       if (iif)
-               NLA_PUT_U32(skb, RTA_IIF, iif);
-       else if (dst) {
+       if (iif) {
+#ifdef CONFIG_IPV6_MROUTE
+               if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
+                       int err = ip6mr_get_route(skb, rtm, nowait);
+                       if (err <= 0) {
+                               if (!nowait) {
+                                       if (err == 0)
+                                               return 0;
+                                       goto nla_put_failure;
+                               } else {
+                                       if (err == -EMSGSIZE)
+                                               goto nla_put_failure;
+                               }
+                       }
+               } else
+#endif
+                       NLA_PUT_U32(skb, RTA_IIF, iif);
+       } else if (dst) {
                struct in6_addr saddr_buf;
                if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev,
                                       dst, 0, &saddr_buf) == 0)
@@ -2211,7 +2227,7 @@ int rt6_dump_route(struct rt6_info *rt, void *p_arg)
 
        return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
                     NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
-                    prefix, NLM_F_MULTI);
+                    prefix, 0, NLM_F_MULTI);
 }
 
 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
@@ -2277,7 +2293,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
 
        err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
                            RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
-                           nlh->nlmsg_seq, 0, 0);
+                           nlh->nlmsg_seq, 0, 0, 0);
        if (err < 0) {
                kfree_skb(skb);
                goto errout;
@@ -2303,7 +2319,7 @@ void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
                goto errout;
 
        err = rt6_fill_node(skb, rt, NULL, NULL, 0,
-                               event, info->pid, seq, 0, 0);
+                               event, info->pid, seq, 0, 0, 0);
        if (err < 0) {
                /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
                WARN_ON(err == -EMSGSIZE);