root/include/net/ipx.h

INCLUDED FROM

DEFINITIONS

1. ipx_hdr
2. ipx_sk
3. ipxitf_hold
4. ipxitf_put
5. ipxrtr_hold
6. ipxrtr_put

#ifndef _NET_INET_IPX_H_
#define _NET_INET_IPX_H_
/*
 *      The following information is in its entirety obtained from:
 *
 *      Novell 'IPX Router Specification' Version 1.10 
 *              Part No. 107-000029-001
 *
 *      Which is available from ftp.novell.com
 */

#include <linux/netdevice.h>
#include <net/datalink.h>
#include <linux/ipx.h>
#include <linux/list.h>
#include <linux/slab.h>

struct ipx_address {
        __be32  net;
        __u8    node[IPX_NODE_LEN]; 
        __be16  sock;
};

#define ipx_broadcast_node      "\377\377\377\377\377\377"
#define ipx_this_node           "\0\0\0\0\0\0"

#define IPX_MAX_PPROP_HOPS 8

struct ipxhdr {
        __be16                  ipx_checksum __packed;
#define IPX_NO_CHECKSUM cpu_to_be16(0xFFFF)
        __be16                  ipx_pktsize __packed;
        __u8                    ipx_tctrl;
        __u8                    ipx_type;
#define IPX_TYPE_UNKNOWN        0x00
#define IPX_TYPE_RIP            0x01    /* may also be 0 */
#define IPX_TYPE_SAP            0x04    /* may also be 0 */
#define IPX_TYPE_SPX            0x05    /* SPX protocol */
#define IPX_TYPE_NCP            0x11    /* $lots for docs on this (SPIT) */
#define IPX_TYPE_PPROP          0x14    /* complicated flood fill brdcast */
        struct ipx_address      ipx_dest __packed;
        struct ipx_address      ipx_source __packed;
};

static __inline__ struct ipxhdr *ipx_hdr(struct sk_buff *skb)
{
        return (struct ipxhdr *)skb_transport_header(skb);
}

struct ipx_interface {
        /* IPX address */
        __be32                  if_netnum;
        unsigned char           if_node[IPX_NODE_LEN];
        atomic_t                refcnt;

        /* physical device info */
        struct net_device       *if_dev;
        struct datalink_proto   *if_dlink;
        __be16                  if_dlink_type;

        /* socket support */
        unsigned short          if_sknum;
        struct hlist_head       if_sklist;
        spinlock_t              if_sklist_lock;

        /* administrative overhead */
        int                     if_ipx_offset;
        unsigned char           if_internal;
        unsigned char           if_primary;
        
        struct list_head        node; /* node in ipx_interfaces list */
};

struct ipx_route {
        __be32                  ir_net;
        struct ipx_interface    *ir_intrfc;
        unsigned char           ir_routed;
        unsigned char           ir_router_node[IPX_NODE_LEN];
        struct list_head        node; /* node in ipx_routes list */
        atomic_t                refcnt;
};

struct ipx_cb {
        u8      ipx_tctrl;
        __be32  ipx_dest_net;
        __be32  ipx_source_net;
        struct {
                __be32 netnum;
                int index;
        } last_hop;
};

#include <net/sock.h>

struct ipx_sock {
        /* struct sock has to be the first member of ipx_sock */
        struct sock             sk;
        struct ipx_address      dest_addr;
        struct ipx_interface    *intrfc;
        __be16                  port;
#ifdef CONFIG_IPX_INTERN
        unsigned char           node[IPX_NODE_LEN];
#endif
        unsigned short          type;
        /*
         * To handle special ncp connection-handling sockets for mars_nwe,
         * the connection number must be stored in the socket.
         */
        unsigned short          ipx_ncp_conn;
};

static inline struct ipx_sock *ipx_sk(struct sock *sk)
{
        return (struct ipx_sock *)sk;
}

#define IPX_SKB_CB(__skb) ((struct ipx_cb *)&((__skb)->cb[0]))

#define IPX_MIN_EPHEMERAL_SOCKET        0x4000
#define IPX_MAX_EPHEMERAL_SOCKET        0x7fff

extern struct list_head ipx_routes;
extern rwlock_t ipx_routes_lock;

extern struct list_head ipx_interfaces;
struct ipx_interface *ipx_interfaces_head(void);
extern spinlock_t ipx_interfaces_lock;

extern struct ipx_interface *ipx_primary_net;

int ipx_proc_init(void);
void ipx_proc_exit(void);

const char *ipx_frame_name(__be16);
const char *ipx_device_name(struct ipx_interface *intrfc);

static __inline__ void ipxitf_hold(struct ipx_interface *intrfc)
{
        atomic_inc(&intrfc->refcnt);
}

void ipxitf_down(struct ipx_interface *intrfc);
struct ipx_interface *ipxitf_find_using_net(__be32 net);
int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node);
__be16 ipx_cksum(struct ipxhdr *packet, int length);
int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
                     unsigned char *node);
void ipxrtr_del_routes(struct ipx_interface *intrfc);
int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
                        struct iovec *iov, size_t len, int noblock);
int ipxrtr_route_skb(struct sk_buff *skb);
struct ipx_route *ipxrtr_lookup(__be32 net);
int ipxrtr_ioctl(unsigned int cmd, void __user *arg);

static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
{
        if (atomic_dec_and_test(&intrfc->refcnt))
                ipxitf_down(intrfc);
}

static __inline__ void ipxrtr_hold(struct ipx_route *rt)
{
                atomic_inc(&rt->refcnt);
}

static __inline__ void ipxrtr_put(struct ipx_route *rt)
{
                if (atomic_dec_and_test(&rt->refcnt))
                                        kfree(rt);
}
#endif /* _NET_INET_IPX_H_ */