> Hello.
>
> Please consider pulling following changes on top of net-2.6.26 available at:
> git://git.linux-ipv6.org/gitroot/yoshfuji/linux-2.6-dev.git net-2.6.26-mroute-20080403
>
> The original work of IPv6 multicast forwarding was done by
> Mickael Hoerdt, et al. Once they asked me to push their work
> into main-line and after that, several years has passed.
> I've been tried to contact them these days but I cannot find no
> response so far. Anyway, their credits are included in the source code.
>
> Userspace daemon is available at
> git:/git.linux-ipv6.org/gitroot/yoshfuji/mcast-tools.git
>
> ---
>
> HEADLINES
> ---------
>
> [IPV6] ADDRCONF: Fix array size for sysctls.
> [IPV4] MROUTE: Move PIM definitions to <linux/pim.h>.
> [IPV4] MROUTE: Adjust include files for user-space.
> [IPV6] MROUTE: Support multicast forwarding.
> [IPV6] MROUTE: Support PIM-SM (SSM).
> [IPV6]: Comment MRT6_xxx sockopts in include/linux/in6.h.
>
> DIFFSTAT
> --------
>
> include/linux/Kbuild | 2
> include/linux/in6.h | 15
> include/linux/ipv6.h | 5
> include/linux/mroute.h | 25 -
> include/linux/mroute6.h | 231 ++++++
> include/linux/pim.h | 45 +
> net/ipv6/Kconfig | 14
> net/ipv6/Makefile | 2
> net/ipv6/addrconf.c | 17
> net/ipv6/af_inet6.c | 6
> net/ipv6/ip6_input.c | 87 ++
> net/ipv6/ip6_output.c | 6
> net/ipv6/ip6mr.c | 1657 ++++++++++++++++++++++++++++++++++++++++++++++
> net/ipv6/ipv6_sockglue.c | 7
> net/ipv6/raw.c | 7
> net/ipv6/route.c | 30 +
> 16 files changed, 2104 insertions(+), 52 deletions(-)
>
> CHANGESETS
> ----------
>
> commit f7bbafb52a21db3bd3a908355dbe4d0eeb71d9ba
> Author: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
> Date: Tue Mar 25 00:25:11 2008 +0900
>
> [IPV6] ADDRCONF: Fix array size for sysctls.
>
> We have been using __NET_IPV6_MAX for adjusting the size of array
> for sysctl table, but it does not work any longer because of the
> deprecation of NET_IPV6_xxx constants. Let's use DEVCONF_MAX
> instead.
>
> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
>
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 5ab9973..e8250fb 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -3858,7 +3858,7 @@ static int addrconf_sysctl_forward_strategy(ctl_table *table,
> static struct addrconf_sysctl_table
> {
> struct ctl_table_header *sysctl_header;
> - ctl_table addrconf_vars[__NET_IPV6_MAX];
> + ctl_table addrconf_vars[DEVCONF_MAX+1];
> char *dev_name;
> } addrconf_sysctl __read_mostly = {
> .sysctl_header = NULL,
>
> ---
> commit fa9536d81c787be19cbf5b1bee617f345101c05e
> Author: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
> Date: Thu Apr 3 09:22:09 2008 +0900
>
> [IPV4] MROUTE: Move PIM definitions to <linux/pim.h>.
>
> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
>
> diff --git a/include/linux/Kbuild b/include/linux/Kbuild
> index 0fac822..3ec2dad 100644
> --- a/include/linux/Kbuild
> +++ b/include/linux/Kbuild
> @@ -292,6 +292,7 @@ unifdef-y += parport.h
> unifdef-y += patchkey.h
> unifdef-y += pci.h
> unifdef-y += personality.h
> +unifdef-y += pim.h
> unifdef-y += pktcdvd.h
> unifdef-y += pmu.h
> unifdef-y += poll.h
> diff --git a/include/linux/mroute.h b/include/linux/mroute.h
> index 35a8277..c41b421 100644
> --- a/include/linux/mroute.h
> +++ b/include/linux/mroute.h
> @@ -3,6 +3,7 @@
>
> #include <linux/sockios.h>
> #include <linux/in.h>
> +#include <linux/pim.h>
>
> /*
> * Based on the MROUTING 3.5 defines primarily to keep
> @@ -210,27 +211,6 @@ struct mfc_cache
> #define IGMPMSG_WHOLEPKT 3 /* For PIM Register processing */
>
> #ifdef __KERNEL__
> -
> -#define PIM_V1_VERSION __constant_htonl(0x10000000)
> -#define PIM_V1_REGISTER 1
> -
> -#define PIM_VERSION 2
> -#define PIM_REGISTER 1
> -
> -#define PIM_NULL_REGISTER __constant_htonl(0x40000000)
> -
> -/* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */
> -
> -struct pimreghdr
> -{
> - __u8 type;
> - __u8 reserved;
> - __be16 csum;
> - __be32 flags;
> -};
> -
> -extern int pim_rcv_v1(struct sk_buff *);
> -
> struct rtmsg;
> extern int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait);
> #endif
> diff --git a/include/linux/pim.h b/include/linux/pim.h
> new file mode 100644
> index 0000000..6f689dc
> --- /dev/null
> +++ b/include/linux/pim.h
> @@ -0,0 +1,29 @@
> +#ifndef __LINUX_PIM_H
> +#define __LINUX_PIM_H
> +
> +#include <asm/byteorder.h>
> +
> +/* Message types - V1 */
> +#define PIM_V1_VERSION __constant_htonl(0x10000000)
> +#define PIM_V1_REGISTER 1
> +
> +/* Message types - V2 */
> +#define PIM_VERSION 2
> +#define PIM_REGISTER 1
> +
> +#if defined(__KERNEL__)
> +#define PIM_NULL_REGISTER __constant_htonl(0x40000000)
> +
> +/* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */
> +struct pimreghdr
> +{
> + __u8 type;
> + __u8 reserved;
> + __be16 csum;
> + __be32 flags;
> +};
> +
> +struct sk_buff;
> +extern int pim_rcv_v1(struct sk_buff *);
> +#endif
> +#endif
>
> ---
> commit 8b18228dd55e4e245df875b595147588a2f2f4dc
> Author: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
> Date: Thu Apr 3 09:22:52 2008 +0900
>
> [IPV4] MROUTE: Adjust include files for user-space.
>
> <linux/mroute.h> needs <linux/types.h>.
> Avoid including <linux/in.h> in user-space, which conflicts with
> standard <netinet/in.h>.
> Add basic struct and constant in <linux/pim.h>.
>
> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
>
> diff --git a/include/linux/mroute.h b/include/linux/mroute.h
> index c41b421..de4decf 100644
> --- a/include/linux/mroute.h
> +++ b/include/linux/mroute.h
> @@ -2,7 +2,10 @@
> #define __LINUX_MROUTE_H
>
> #include <linux/sockios.h>
> +#include <linux/types.h>
> +#ifdef __KERNEL__
> #include <linux/in.h>
> +#endif
> #include <linux/pim.h>
>
> /*
> diff --git a/include/linux/pim.h b/include/linux/pim.h
> index 6f689dc..236ffd3 100644
> --- a/include/linux/pim.h
> +++ b/include/linux/pim.h
> @@ -3,6 +3,22 @@
>
> #include <asm/byteorder.h>
>
> +#ifndef __KERNEL__
> +struct pim {
> +#if defined(__LITTLE_ENDIAN_BITFIELD)
> + __u8 pim_type:4, /* PIM message type */
> + pim_ver:4; /* PIM version */
> +#elif defined(__BIG_ENDIAN_BITFIELD)
> + __u8 pim_ver:4; /* PIM version */
> + pim_type:4; /* PIM message type */
> +#endif
> + __u8 pim_rsv; /* Reserved */
> + __be16 pim_cksum; /* Checksum */
> +};
> +
> +#define PIM_MINLEN 8
> +#endif
> +
> /* Message types - V1 */
> #define PIM_V1_VERSION __constant_htonl(0x10000000)
> #define PIM_V1_REGISTER 1
>
> ---
> commit b08378b4c3589d563fa42e43a9750455ce2368f6
> Author: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
> Date: Thu Apr 3 09:22:53 2008 +0900
>
> [IPV6] MROUTE: Support multicast forwarding.
>
> 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>
>
> diff --git a/include/linux/Kbuild b/include/linux/Kbuild
> index 3ec2dad..cfe58d1 100644
> --- a/include/linux/Kbuild
> +++ b/include/linux/Kbuild
> @@ -264,6 +264,7 @@ 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
> diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
> index b90d3d4..f53e476 100644
> --- a/include/linux/ipv6.h
> +++ b/include/linux/ipv6.h
> @@ -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
> index 0000000..b921903
> --- /dev/null
> +++ b/include/linux/mroute6.h
> @@ -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
> diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
> index 47263e4..9a2ea81 100644
> --- a/net/ipv6/Kconfig
> +++ b/net/ipv6/Kconfig
> @@ -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.
> +
> diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
> index ae14617..686934a 100644
> --- a/net/ipv6/Makefile
> +++ b/net/ipv6/Makefile
> @@ -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
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index e8250fb..e685450 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -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;
>
> @@ -3528,6 +3528,9 @@ 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)
> @@ -4076,6 +4079,16 @@ 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 */
> }
> diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
> index 1731b0a..3c6aafb 100644
> --- a/net/ipv6/af_inet6.c
> +++ b/net/ipv6/af_inet6.c
> @@ -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;
> diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
> index 7e36269..49fc71c 100644
> --- a/net/ipv6/ip6_input.c
> +++ b/net/ipv6/ip6_input.c
> @@ -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>
> @@ -237,36 +238,84 @@ int ip6_mc_input(struct sk_buff *skb)
> deliver = unlikely(skb->dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) ||
> 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);
>
> diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
> index a8b4da2..c0dbe54 100644
> --- a/net/ipv6/ip6_output.c
> +++ b/net/ipv6/ip6_output.c
> @@ -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
> index 0000000..1bdf3c1
> --- /dev/null
> +++ b/net/ipv6/ip6mr.c
> @@ -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 -ENO
