Commit 7bc570c8 authored by YOSHIFUJI Hideaki's avatar YOSHIFUJI Hideaki
Browse files

[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: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
parent 80a9492a

include/linux/Kbuild

+1 −0
Original line number Diff line number Diff line
@@ -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

include/linux/ipv6.h

+5 −0
Original line number Diff line number Diff line
@@ -159,6 +159,9 @@ struct ipv6_devconf { 
	__s32		accept_source_route;

#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))

include/linux/mroute6.h

0 → 100644
+227 −0
Original line number Diff line number Diff line 
#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

net/ipv6/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -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.

net/ipv6/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -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

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