[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/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