original development tree for Linux kernel GTP module; now long in mainline.
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linux-gtp/net/ipx/af_ipx.c

2104 lines
50 KiB

/*
* Implements an IPX socket layer.
*
* This code is derived from work by
* Ross Biro : Writing the original IP stack
* Fred Van Kempen : Tidying up the TCP/IP
*
* Many thanks go to Keith Baker, Institute For Industrial Information
* Technology Ltd, Swansea University for allowing me to work on this
* in my own time even though it was in some ways related to commercial
* work I am currently employed to do there.
*
* All the material in this file is subject to the Gnu license version 2.
* Neither Alan Cox nor the Swansea University Computer Society admit
* liability nor provide warranty for any of this software. This material
* is provided as is and at no charge.
*
* Portions Copyright (c) 2000-2003 Conectiva, Inc. <acme@conectiva.com.br>
* Neither Arnaldo Carvalho de Melo nor Conectiva, Inc. admit liability nor
* provide warranty for any of this software. This material is provided
* "AS-IS" and at no charge.
*
* Portions Copyright (c) 1995 Caldera, Inc. <greg@caldera.com>
* Neither Greg Page nor Caldera, Inc. admit liability nor provide
* warranty for any of this software. This material is provided
* "AS-IS" and at no charge.
*
* See net/ipx/ChangeLog.
*/
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/ipx.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/uio.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/smp_lock.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/termios.h>
#include <net/ipx.h>
#include <net/p8022.h>
#include <net/psnap.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <asm/uaccess.h>
#ifdef CONFIG_SYSCTL
extern void ipx_register_sysctl(void);
extern void ipx_unregister_sysctl(void);
#else
#define ipx_register_sysctl()
#define ipx_unregister_sysctl()
#endif
/* Configuration Variables */
static unsigned char ipxcfg_max_hops = 16;
static char ipxcfg_auto_select_primary;
static char ipxcfg_auto_create_interfaces;
int sysctl_ipx_pprop_broadcasting = 1;
/* Global Variables */
static struct datalink_proto *p8022_datalink;
static struct datalink_proto *pEII_datalink;
static struct datalink_proto *p8023_datalink;
static struct datalink_proto *pSNAP_datalink;
static const struct proto_ops ipx_dgram_ops;
LIST_HEAD(ipx_interfaces);
DEFINE_SPINLOCK(ipx_interfaces_lock);
struct ipx_interface *ipx_primary_net;
struct ipx_interface *ipx_internal_net;
extern int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
unsigned char *node);
extern void ipxrtr_del_routes(struct ipx_interface *intrfc);
extern int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
struct iovec *iov, size_t len, int noblock);
extern int ipxrtr_route_skb(struct sk_buff *skb);
extern struct ipx_route *ipxrtr_lookup(__be32 net);
extern int ipxrtr_ioctl(unsigned int cmd, void __user *arg);
struct ipx_interface *ipx_interfaces_head(void)
{
struct ipx_interface *rc = NULL;
if (!list_empty(&ipx_interfaces))
rc = list_entry(ipx_interfaces.next,
struct ipx_interface, node);
return rc;
}
static void ipxcfg_set_auto_select(char val)
{
ipxcfg_auto_select_primary = val;
if (val && !ipx_primary_net)
ipx_primary_net = ipx_interfaces_head();
}
static int ipxcfg_get_config_data(struct ipx_config_data __user *arg)
{
struct ipx_config_data vals;
vals.ipxcfg_auto_create_interfaces = ipxcfg_auto_create_interfaces;
vals.ipxcfg_auto_select_primary = ipxcfg_auto_select_primary;
return copy_to_user(arg, &vals, sizeof(vals)) ? -EFAULT : 0;
}
/*
* Note: Sockets may not be removed _during_ an interrupt or inet_bh
* handler using this technique. They can be added although we do not
* use this facility.
*/
static void ipx_remove_socket(struct sock *sk)
{
/* Determine interface with which socket is associated */
struct ipx_interface *intrfc = ipx_sk(sk)->intrfc;
if (!intrfc)
goto out;
ipxitf_hold(intrfc);
spin_lock_bh(&intrfc->if_sklist_lock);
sk_del_node_init(sk);
spin_unlock_bh(&intrfc->if_sklist_lock);
ipxitf_put(intrfc);
out:
return;
}
static void ipx_destroy_socket(struct sock *sk)
{
ipx_remove_socket(sk);
skb_queue_purge(&sk->sk_receive_queue);
sk_refcnt_debug_dec(sk);
sock_put(sk);
}
/*
* The following code is used to support IPX Interfaces (IPXITF). An
* IPX interface is defined by a physical device and a frame type.
*/
/* ipxitf_clear_primary_net has to be called with ipx_interfaces_lock held */
static void ipxitf_clear_primary_net(void)
{
ipx_primary_net = NULL;
if (ipxcfg_auto_select_primary)
ipx_primary_net = ipx_interfaces_head();
}
static struct ipx_interface *__ipxitf_find_using_phys(struct net_device *dev,
__be16 datalink)
{
struct ipx_interface *i;
list_for_each_entry(i, &ipx_interfaces, node)
if (i->if_dev == dev && i->if_dlink_type == datalink)
goto out;
i = NULL;
out:
return i;
}
static struct ipx_interface *ipxitf_find_using_phys(struct net_device *dev,
__be16 datalink)
{
struct ipx_interface *i;
spin_lock_bh(&ipx_interfaces_lock);
i = __ipxitf_find_using_phys(dev, datalink);
if (i)
ipxitf_hold(i);
spin_unlock_bh(&ipx_interfaces_lock);
return i;
}
struct ipx_interface *ipxitf_find_using_net(__be32 net)
{
struct ipx_interface *i;
spin_lock_bh(&ipx_interfaces_lock);
if (net) {
list_for_each_entry(i, &ipx_interfaces, node)
if (i->if_netnum == net)
goto hold;
i = NULL;
goto unlock;
}
i = ipx_primary_net;
if (i)
hold:
ipxitf_hold(i);
unlock:
spin_unlock_bh(&ipx_interfaces_lock);
return i;
}
/* Sockets are bound to a particular IPX interface. */
static void ipxitf_insert_socket(struct ipx_interface *intrfc, struct sock *sk)
{
ipxitf_hold(intrfc);
spin_lock_bh(&intrfc->if_sklist_lock);
ipx_sk(sk)->intrfc = intrfc;
sk_add_node(sk, &intrfc->if_sklist);
spin_unlock_bh(&intrfc->if_sklist_lock);
ipxitf_put(intrfc);
}
/* caller must hold intrfc->if_sklist_lock */
static struct sock *__ipxitf_find_socket(struct ipx_interface *intrfc,
__be16 port)
{
struct sock *s;
struct hlist_node *node;
sk_for_each(s, node, &intrfc->if_sklist)
if (ipx_sk(s)->port == port)
goto found;
s = NULL;
found:
return s;
}
/* caller must hold a reference to intrfc */
static struct sock *ipxitf_find_socket(struct ipx_interface *intrfc,
__be16 port)
{
struct sock *s;
spin_lock_bh(&intrfc->if_sklist_lock);
s = __ipxitf_find_socket(intrfc, port);
if (s)
sock_hold(s);
spin_unlock_bh(&intrfc->if_sklist_lock);
return s;
}
#ifdef CONFIG_IPX_INTERN
static struct sock *ipxitf_find_internal_socket(struct ipx_interface *intrfc,
unsigned char *ipx_node,
__be16 port)
{
struct sock *s;
struct hlist_node *node;
ipxitf_hold(intrfc);
spin_lock_bh(&intrfc->if_sklist_lock);
sk_for_each(s, node, &intrfc->if_sklist) {
struct ipx_sock *ipxs = ipx_sk(s);
if (ipxs->port == port &&
!memcmp(ipx_node, ipxs->node, IPX_NODE_LEN))
goto found;
}
s = NULL;
found:
spin_unlock_bh(&intrfc->if_sklist_lock);
ipxitf_put(intrfc);
return s;
}
#endif
static void __ipxitf_down(struct ipx_interface *intrfc)
{
struct sock *s;
struct hlist_node *node, *t;
/* Delete all routes associated with this interface */
ipxrtr_del_routes(intrfc);
spin_lock_bh(&intrfc->if_sklist_lock);
/* error sockets */
sk_for_each_safe(s, node, t, &intrfc->if_sklist) {
struct ipx_sock *ipxs = ipx_sk(s);
s->sk_err = ENOLINK;
s->sk_error_report(s);
ipxs->intrfc = NULL;
ipxs->port = 0;
sock_set_flag(s, SOCK_ZAPPED); /* Indicates it is no longer bound */
sk_del_node_init(s);
}
INIT_HLIST_HEAD(&intrfc->if_sklist);
spin_unlock_bh(&intrfc->if_sklist_lock);
/* remove this interface from list */
list_del(&intrfc->node);
/* remove this interface from *special* networks */
if (intrfc == ipx_primary_net)
ipxitf_clear_primary_net();
if (intrfc == ipx_internal_net)
ipx_internal_net = NULL;
if (intrfc->if_dev)
dev_put(intrfc->if_dev);
kfree(intrfc);
}
void ipxitf_down(struct ipx_interface *intrfc)
{
spin_lock_bh(&ipx_interfaces_lock);
__ipxitf_down(intrfc);
spin_unlock_bh(&ipx_interfaces_lock);
}
static __inline__ void __ipxitf_put(struct ipx_interface *intrfc)
{
if (atomic_dec_and_test(&intrfc->refcnt))
__ipxitf_down(intrfc);
}
static int ipxitf_device_event(struct notifier_block *notifier,
unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
struct ipx_interface *i, *tmp;
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
if (event != NETDEV_DOWN && event != NETDEV_UP)
goto out;
spin_lock_bh(&ipx_interfaces_lock);
list_for_each_entry_safe(i, tmp, &ipx_interfaces, node)
if (i->if_dev == dev) {
if (event == NETDEV_UP)
ipxitf_hold(i);
else
__ipxitf_put(i);
}
spin_unlock_bh(&ipx_interfaces_lock);
out:
return NOTIFY_DONE;
}
static __exit void ipxitf_cleanup(void)
{
struct ipx_interface *i, *tmp;
spin_lock_bh(&ipx_interfaces_lock);
list_for_each_entry_safe(i, tmp, &ipx_interfaces, node)
__ipxitf_put(i);
spin_unlock_bh(&ipx_interfaces_lock);
}
static void ipxitf_def_skb_handler(struct sock *sock, struct sk_buff *skb)
{
if (sock_queue_rcv_skb(sock, skb) < 0)
kfree_skb(skb);
}
/*
* On input skb->sk is NULL. Nobody is charged for the memory.
*/
/* caller must hold a reference to intrfc */
#ifdef CONFIG_IPX_INTERN
static int ipxitf_demux_socket(struct ipx_interface *intrfc,
struct sk_buff *skb, int copy)
{
struct ipxhdr *ipx = ipx_hdr(skb);
int is_broadcast = !memcmp(ipx->ipx_dest.node, ipx_broadcast_node,
IPX_NODE_LEN);
struct sock *s;
struct hlist_node *node;
int rc;
spin_lock_bh(&intrfc->if_sklist_lock);
sk_for_each(s, node, &intrfc->if_sklist) {
struct ipx_sock *ipxs = ipx_sk(s);
if (ipxs->port == ipx->ipx_dest.sock &&
(is_broadcast || !memcmp(ipx->ipx_dest.node,
ipxs->node, IPX_NODE_LEN))) {
/* We found a socket to which to send */
struct sk_buff *skb1;
if (copy) {
skb1 = skb_clone(skb, GFP_ATOMIC);
rc = -ENOMEM;
if (!skb1)
goto out;
} else {
skb1 = skb;
copy = 1; /* skb may only be used once */
}
ipxitf_def_skb_handler(s, skb1);
/* On an external interface, one socket can listen */
if (intrfc != ipx_internal_net)
break;
}
}
/* skb was solely for us, and we did not make a copy, so free it. */
if (!copy)
kfree_skb(skb);
rc = 0;
out:
spin_unlock_bh(&intrfc->if_sklist_lock);
return rc;
}
#else
static struct sock *ncp_connection_hack(struct ipx_interface *intrfc,
struct ipxhdr *ipx)
{
/* The packet's target is a NCP connection handler. We want to hand it
* to the correct socket directly within the kernel, so that the
* mars_nwe packet distribution process does not have to do it. Here we
* only care about NCP and BURST packets.
*
* You might call this a hack, but believe me, you do not want a
* complete NCP layer in the kernel, and this is VERY fast as well. */
struct sock *sk = NULL;
int connection = 0;
u8 *ncphdr = (u8 *)(ipx + 1);
if (*ncphdr == 0x22 && *(ncphdr + 1) == 0x22) /* NCP request */
connection = (((int) *(ncphdr + 5)) << 8) | (int) *(ncphdr + 3);
else if (*ncphdr == 0x77 && *(ncphdr + 1) == 0x77) /* BURST packet */
connection = (((int) *(ncphdr + 9)) << 8) | (int) *(ncphdr + 8);
if (connection) {
struct hlist_node *node;
/* Now we have to look for a special NCP connection handling
* socket. Only these sockets have ipx_ncp_conn != 0, set by
* SIOCIPXNCPCONN. */
spin_lock_bh(&intrfc->if_sklist_lock);
sk_for_each(sk, node, &intrfc->if_sklist)
if (ipx_sk(sk)->ipx_ncp_conn == connection) {
sock_hold(sk);
goto found;
}
sk = NULL;
found:
spin_unlock_bh(&intrfc->if_sklist_lock);
}
return sk;
}
static int ipxitf_demux_socket(struct ipx_interface *intrfc,
struct sk_buff *skb, int copy)
{
struct ipxhdr *ipx = ipx_hdr(skb);
struct sock *sock1 = NULL, *sock2 = NULL;
struct sk_buff *skb1 = NULL, *skb2 = NULL;
int rc;
if (intrfc == ipx_primary_net && ntohs(ipx->ipx_dest.sock) == 0x451)
sock1 = ncp_connection_hack(intrfc, ipx);
if (!sock1)
/* No special socket found, forward the packet the normal way */
sock1 = ipxitf_find_socket(intrfc, ipx->ipx_dest.sock);
/*
* We need to check if there is a primary net and if
* this is addressed to one of the *SPECIAL* sockets because
* these need to be propagated to the primary net.
* The *SPECIAL* socket list contains: 0x452(SAP), 0x453(RIP) and
* 0x456(Diagnostic).
*/
if (ipx_primary_net && intrfc != ipx_primary_net) {
const int dsock = ntohs(ipx->ipx_dest.sock);
if (dsock == 0x452 || dsock == 0x453 || dsock == 0x456)
/* The appropriate thing to do here is to dup the
* packet and route to the primary net interface via
* ipxitf_send; however, we'll cheat and just demux it
* here. */
sock2 = ipxitf_find_socket(ipx_primary_net,
ipx->ipx_dest.sock);
}
/*
* If there is nothing to do return. The kfree will cancel any charging.
*/
rc = 0;
if (!sock1 && !sock2) {
if (!copy)
kfree_skb(skb);
goto out;
}
/*
* This next segment of code is a little awkward, but it sets it up
* so that the appropriate number of copies of the SKB are made and
* that skb1 and skb2 point to it (them) so that it (they) can be
* demuxed to sock1 and/or sock2. If we are unable to make enough
* copies, we do as much as is possible.
*/
if (copy)
skb1 = skb_clone(skb, GFP_ATOMIC);
else
skb1 = skb;
rc = -ENOMEM;
if (!skb1)
goto out_put;
/* Do we need 2 SKBs? */
if (sock1 && sock2)
skb2 = skb_clone(skb1, GFP_ATOMIC);
else
skb2 = skb1;
if (sock1)
ipxitf_def_skb_handler(sock1, skb1);
if (!skb2)
goto out_put;
if (sock2)
ipxitf_def_skb_handler(sock2, skb2);
rc = 0;
out_put:
if (sock1)
sock_put(sock1);
if (sock2)
sock_put(sock2);
out:
return rc;
}
#endif /* CONFIG_IPX_INTERN */
static struct sk_buff *ipxitf_adjust_skbuff(struct ipx_interface *intrfc,
struct sk_buff *skb)
{
struct sk_buff *skb2;
int in_offset = (unsigned char *)ipx_hdr(skb) - skb->head;
int out_offset = intrfc->if_ipx_offset;
int len;
/* Hopefully, most cases */
if (in_offset >= out_offset)
return skb;
/* Need new SKB */
len = skb->len + out_offset;
skb2 = alloc_skb(len, GFP_ATOMIC);
if (skb2) {
skb_reserve(skb2, out_offset);
skb_reset_network_header(skb2);
skb_reset_transport_header(skb2);
skb_put(skb2, skb->len);
memcpy(ipx_hdr(skb2), ipx_hdr(skb), skb->len);
memcpy(skb2->cb, skb->cb, sizeof(skb->cb));
}
kfree_skb(skb);
return skb2;
}
/* caller must hold a reference to intrfc and the skb has to be unshared */
int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node)
{
struct ipxhdr *ipx = ipx_hdr(skb);
struct net_device *dev = intrfc->if_dev;
struct datalink_proto *dl = intrfc->if_dlink;
char dest_node[IPX_NODE_LEN];
int send_to_wire = 1;
int addr_len;
ipx->ipx_tctrl = IPX_SKB_CB(skb)->ipx_tctrl;
ipx->ipx_dest.net = IPX_SKB_CB(skb)->ipx_dest_net;
ipx->ipx_source.net = IPX_SKB_CB(skb)->ipx_source_net;
/* see if we need to include the netnum in the route list */
if (IPX_SKB_CB(skb)->last_hop.index >= 0) {
__be32 *last_hop = (__be32 *)(((u8 *) skb->data) +
sizeof(struct ipxhdr) +
IPX_SKB_CB(skb)->last_hop.index *
sizeof(__be32));
*last_hop = IPX_SKB_CB(skb)->last_hop.netnum;
IPX_SKB_CB(skb)->last_hop.index = -1;
}
/*
* We need to know how many skbuffs it will take to send out this
* packet to avoid unnecessary copies.
*/
if (!dl || !dev || dev->flags & IFF_LOOPBACK)
send_to_wire = 0; /* No non looped */
/*
* See if this should be demuxed to sockets on this interface
*
* We want to ensure the original was eaten or that we only use
* up clones.
*/
if (ipx->ipx_dest.net == intrfc->if_netnum) {
/*
* To our own node, loop and free the original.
* The internal net will receive on all node address.
*/
if (intrfc == ipx_internal_net ||
!memcmp(intrfc->if_node, node, IPX_NODE_LEN)) {
/* Don't charge sender */
skb_orphan(skb);
/* Will charge receiver */
return ipxitf_demux_socket(intrfc, skb, 0);
}
/* Broadcast, loop and possibly keep to send on. */
if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN)) {
if (!send_to_wire)
skb_orphan(skb);
ipxitf_demux_socket(intrfc, skb, send_to_wire);
if (!send_to_wire)
goto out;
}
}
/*
* If the originating net is not equal to our net; this is routed
* We are still charging the sender. Which is right - the driver
* free will handle this fairly.
*/
if (ipx->ipx_source.net != intrfc->if_netnum) {
/*
* Unshare the buffer before modifying the count in
* case it's a flood or tcpdump
*/
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb)
goto out;
if (++ipx->ipx_tctrl > ipxcfg_max_hops)
send_to_wire = 0;
}
if (!send_to_wire) {
kfree_skb(skb);
goto out;
}
/* Determine the appropriate hardware address */
addr_len = dev->addr_len;
if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN))
memcpy(dest_node, dev->broadcast, addr_len);
else
memcpy(dest_node, &(node[IPX_NODE_LEN-addr_len]), addr_len);
/* Make any compensation for differing physical/data link size */
skb = ipxitf_adjust_skbuff(intrfc, skb);
if (!skb)
goto out;
/* set up data link and physical headers */
skb->dev = dev;
skb->protocol = htons(ETH_P_IPX);
/* Send it out */
dl->request(dl, skb, dest_node);
out:
return 0;
}
static int ipxitf_add_local_route(struct ipx_interface *intrfc)
{
return ipxrtr_add_route(intrfc->if_netnum, intrfc, NULL);
}
static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
struct sk_buff *skb);
static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb);
static int ipxitf_rcv(struct ipx_interface *intrfc, struct sk_buff *skb)
{
struct ipxhdr *ipx = ipx_hdr(skb);
int rc = 0;
ipxitf_hold(intrfc);
/* See if we should update our network number */
if (!intrfc->if_netnum) /* net number of intrfc not known yet */
ipxitf_discover_netnum(intrfc, skb);
IPX_SKB_CB(skb)->last_hop.index = -1;
if (ipx->ipx_type == IPX_TYPE_PPROP) {
rc = ipxitf_pprop(intrfc, skb);
if (rc)
goto out_free_skb;
}
/* local processing follows */
if (!IPX_SKB_CB(skb)->ipx_dest_net)
IPX_SKB_CB(skb)->ipx_dest_net = intrfc->if_netnum;
if (!IPX_SKB_CB(skb)->ipx_source_net)
IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;
/* it doesn't make sense to route a pprop packet, there's no meaning
* in the ipx_dest_net for such packets */
if (ipx->ipx_type != IPX_TYPE_PPROP &&
intrfc->if_netnum != IPX_SKB_CB(skb)->ipx_dest_net) {
/* We only route point-to-point packets. */
if (skb->pkt_type == PACKET_HOST) {
skb = skb_unshare(skb, GFP_ATOMIC);
if (skb)
rc = ipxrtr_route_skb(skb);
goto out_intrfc;
}
goto out_free_skb;
}
/* see if we should keep it */
if (!memcmp(ipx_broadcast_node, ipx->ipx_dest.node, IPX_NODE_LEN) ||
!memcmp(intrfc->if_node, ipx->ipx_dest.node, IPX_NODE_LEN)) {
rc = ipxitf_demux_socket(intrfc, skb, 0);
goto out_intrfc;
}
/* we couldn't pawn it off so unload it */
out_free_skb:
kfree_skb(skb);
out_intrfc:
ipxitf_put(intrfc);
return rc;
}
static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
struct sk_buff *skb)
{
const struct ipx_cb *cb = IPX_SKB_CB(skb);
/* see if this is an intra packet: source_net == dest_net */
if (cb->ipx_source_net == cb->ipx_dest_net && cb->ipx_source_net) {
struct ipx_interface *i =
ipxitf_find_using_net(cb->ipx_source_net);
/* NB: NetWare servers lie about their hop count so we
* dropped the test based on it. This is the best way
* to determine this is a 0 hop count packet. */
if (!i) {
intrfc->if_netnum = cb->ipx_source_net;
ipxitf_add_local_route(intrfc);
} else {
printk(KERN_WARNING "IPX: Network number collision "
"%lx\n %s %s and %s %s\n",
(unsigned long) ntohl(cb->ipx_source_net),
ipx_device_name(i),
ipx_frame_name(i->if_dlink_type),
ipx_device_name(intrfc),
ipx_frame_name(intrfc->if_dlink_type));
ipxitf_put(i);
}
}
}
/**
* ipxitf_pprop - Process packet propagation IPX packet type 0x14, used for
* NetBIOS broadcasts
* @intrfc: IPX interface receiving this packet
* @skb: Received packet
*
* Checks if packet is valid: if its more than %IPX_MAX_PPROP_HOPS hops or if it
* is smaller than a IPX header + the room for %IPX_MAX_PPROP_HOPS hops we drop
* it, not even processing it locally, if it has exact %IPX_MAX_PPROP_HOPS we
* don't broadcast it, but process it locally. See chapter 5 of Novell's "IPX
* RIP and SAP Router Specification", Part Number 107-000029-001.
*
* If it is valid, check if we have pprop broadcasting enabled by the user,
* if not, just return zero for local processing.
*
* If it is enabled check the packet and don't broadcast it if we have already
* seen this packet.
*
* Broadcast: send it to the interfaces that aren't on the packet visited nets
* array, just after the IPX header.
*
* Returns -EINVAL for invalid packets, so that the calling function drops
* the packet without local processing. 0 if packet is to be locally processed.
*/
static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb)
{
struct ipxhdr *ipx = ipx_hdr(skb);
int i, rc = -EINVAL;
struct ipx_interface *ifcs;
char *c;
__be32 *l;
/* Illegal packet - too many hops or too short */
/* We decide to throw it away: no broadcasting, no local processing.
* NetBIOS unaware implementations route them as normal packets -
* tctrl <= 15, any data payload... */
if (IPX_SKB_CB(skb)->ipx_tctrl > IPX_MAX_PPROP_HOPS ||
ntohs(ipx->ipx_pktsize) < sizeof(struct ipxhdr) +
IPX_MAX_PPROP_HOPS * sizeof(u32))
goto out;
/* are we broadcasting this damn thing? */
rc = 0;
if (!sysctl_ipx_pprop_broadcasting)
goto out;
/* We do broadcast packet on the IPX_MAX_PPROP_HOPS hop, but we
* process it locally. All previous hops broadcasted it, and process it
* locally. */
if (IPX_SKB_CB(skb)->ipx_tctrl == IPX_MAX_PPROP_HOPS)
goto out;
c = ((u8 *) ipx) + sizeof(struct ipxhdr);
l = (__be32 *) c;
/* Don't broadcast packet if already seen this net */
for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
if (*l++ == intrfc->if_netnum)
goto out;
/* < IPX_MAX_PPROP_HOPS hops && input interface not in list. Save the
* position where we will insert recvd netnum into list, later on,
* in ipxitf_send */
IPX_SKB_CB(skb)->last_hop.index = i;
IPX_SKB_CB(skb)->last_hop.netnum = intrfc->if_netnum;
/* xmit on all other interfaces... */
spin_lock_bh(&ipx_interfaces_lock);
list_for_each_entry(ifcs, &ipx_interfaces, node) {
/* Except unconfigured interfaces */
if (!ifcs->if_netnum)
continue;
/* That aren't in the list */
if (ifcs == intrfc)
continue;
l = (__be32 *) c;
/* don't consider the last entry in the packet list,
* it is our netnum, and it is not there yet */
for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
if (ifcs->if_netnum == *l++)
break;
if (i == IPX_SKB_CB(skb)->ipx_tctrl) {
struct sk_buff *s = skb_copy(skb, GFP_ATOMIC);
if (s) {
IPX_SKB_CB(s)->ipx_dest_net = ifcs->if_netnum;
ipxrtr_route_skb(s);
}
}
}
spin_unlock_bh(&ipx_interfaces_lock);
out:
return rc;
}
static void ipxitf_insert(struct ipx_interface *intrfc)
{
spin_lock_bh(&ipx_interfaces_lock);
list_add_tail(&intrfc->node, &ipx_interfaces);
spin_unlock_bh(&ipx_interfaces_lock);
if (ipxcfg_auto_select_primary && !ipx_primary_net)
ipx_primary_net = intrfc;
}
static struct ipx_interface *ipxitf_alloc(struct net_device *dev, __be32 netnum,
__be16 dlink_type,
struct datalink_proto *dlink,
unsigned char internal,
int ipx_offset)
{
struct ipx_interface *intrfc = kmalloc(sizeof(*intrfc), GFP_ATOMIC);
if (intrfc) {
intrfc->if_dev = dev;
intrfc->if_netnum = netnum;
intrfc->if_dlink_type = dlink_type;
intrfc->if_dlink = dlink;
intrfc->if_internal = internal;
intrfc->if_ipx_offset = ipx_offset;
intrfc->if_sknum = IPX_MIN_EPHEMERAL_SOCKET;
INIT_HLIST_HEAD(&intrfc->if_sklist);
atomic_set(&intrfc->refcnt, 1);
spin_lock_init(&intrfc->if_sklist_lock);
}
return intrfc;
}
static int ipxitf_create_internal(struct ipx_interface_definition *idef)
{
struct ipx_interface *intrfc;
int rc = -EEXIST;
/* Only one primary network allowed */
if (ipx_primary_net)
goto out;
/* Must have a valid network number */
rc = -EADDRNOTAVAIL;
if (!idef->ipx_network)
goto out;
intrfc = ipxitf_find_using_net(idef->ipx_network);
rc = -EADDRINUSE;
if (intrfc) {
ipxitf_put(intrfc);
goto out;
}
intrfc = ipxitf_alloc(NULL, idef->ipx_network, 0, NULL, 1, 0);
rc = -EAGAIN;
if (!intrfc)
goto out;
memcpy((char *)&(intrfc->if_node), idef->ipx_node, IPX_NODE_LEN);
ipx_internal_net = ipx_primary_net = intrfc;
ipxitf_hold(intrfc);
ipxitf_insert(intrfc);
rc = ipxitf_add_local_route(intrfc);
ipxitf_put(intrfc);
out:
return rc;
}
static __be16 ipx_map_frame_type(unsigned char type)
{
__be16 rc = 0;
switch (type) {
case IPX_FRAME_ETHERII: rc = htons(ETH_P_IPX); break;
case IPX_FRAME_8022: rc = htons(ETH_P_802_2); break;
case IPX_FRAME_SNAP: rc = htons(ETH_P_SNAP); break;
case IPX_FRAME_8023: rc = htons(ETH_P_802_3); break;
}
return rc;
}
static int ipxitf_create(struct ipx_interface_definition *idef)
{
struct net_device *dev;
__be16 dlink_type = 0;
struct datalink_proto *datalink = NULL;
struct ipx_interface *intrfc;
int rc;
if (idef->ipx_special == IPX_INTERNAL) {
rc = ipxitf_create_internal(idef);
goto out;
}
rc = -EEXIST;
if (idef->ipx_special == IPX_PRIMARY && ipx_primary_net)
goto out;
intrfc = ipxitf_find_using_net(idef->ipx_network);
rc = -EADDRINUSE;
if (idef->ipx_network && intrfc) {
ipxitf_put(intrfc);
goto out;
}
if (intrfc)
ipxitf_put(intrfc);
dev = dev_get_by_name(&init_net, idef->ipx_device);
rc = -ENODEV;
if (!dev)
goto out;
switch (idef->ipx_dlink_type) {
case IPX_FRAME_TR_8022:
printk(KERN_WARNING "IPX frame type 802.2TR is "
"obsolete Use 802.2 instead.\n");
/* fall through */
case IPX_FRAME_8022:
dlink_type = htons(ETH_P_802_2);
datalink = p8022_datalink;
break;
case IPX_FRAME_ETHERII:
if (dev->type != ARPHRD_IEEE802) {
dlink_type = htons(ETH_P_IPX);
datalink = pEII_datalink;
break;
} else
printk(KERN_WARNING "IPX frame type EtherII over "
"token-ring is obsolete. Use SNAP "
"instead.\n");
/* fall through */
case IPX_FRAME_SNAP:
dlink_type = htons(ETH_P_SNAP);
datalink = pSNAP_datalink;
break;
case IPX_FRAME_8023:
dlink_type = htons(ETH_P_802_3);
datalink = p8023_datalink;
break;
case IPX_FRAME_NONE:
default:
rc = -EPROTONOSUPPORT;
goto out_dev;
}
rc = -ENETDOWN;
if (!(dev->flags & IFF_UP))
goto out_dev;
/* Check addresses are suitable */
rc = -EINVAL;
if (dev->addr_len > IPX_NODE_LEN)
goto out_dev;
intrfc = ipxitf_find_using_phys(dev, dlink_type);
if (!intrfc) {
/* Ok now create */
intrfc = ipxitf_alloc(dev, idef->ipx_network, dlink_type,
datalink, 0, dev->hard_header_len +
datalink->header_length);
rc = -EAGAIN;
if (!intrfc)
goto out_dev;
/* Setup primary if necessary */
if (idef->ipx_special == IPX_PRIMARY)
ipx_primary_net = intrfc;
if (!memcmp(idef->ipx_node, "\000\000\000\000\000\000",
IPX_NODE_LEN)) {
memset(intrfc->if_node, 0, IPX_NODE_LEN);
memcpy(intrfc->if_node + IPX_NODE_LEN - dev->addr_len,
dev->dev_addr, dev->addr_len);
} else
memcpy(intrfc->if_node, idef->ipx_node, IPX_NODE_LEN);
ipxitf_hold(intrfc);
ipxitf_insert(intrfc);
}
/* If the network number is known, add a route */
rc = 0;
if (!intrfc->if_netnum)
goto out_intrfc;
rc = ipxitf_add_local_route(intrfc);
out_intrfc:
ipxitf_put(intrfc);
goto out;
out_dev:
dev_put(dev);
out:
return rc;
}
static int ipxitf_delete(struct ipx_interface_definition *idef)
{
struct net_device *dev = NULL;
__be16 dlink_type = 0;
struct ipx_interface *intrfc;
int rc = 0;
spin_lock_bh(&ipx_interfaces_lock);
if (idef->ipx_special == IPX_INTERNAL) {
if (ipx_internal_net) {
__ipxitf_put(ipx_internal_net);
goto out;
}
rc = -ENOENT;
goto out;
}
dlink_type = ipx_map_frame_type(idef->ipx_dlink_type);
rc = -EPROTONOSUPPORT;
if (!dlink_type)
goto out;
dev = __dev_get_by_name(&init_net, idef->ipx_device);
rc = -ENODEV;
if (!dev)
goto out;
intrfc = __ipxitf_find_using_phys(dev, dlink_type);
rc = -EINVAL;
if (!intrfc)
goto out;
__ipxitf_put(intrfc);
rc = 0;
out:
spin_unlock_bh(&ipx_interfaces_lock);
return rc;
}
static struct ipx_interface *ipxitf_auto_create(struct net_device *dev,
__be16 dlink_type)
{
struct ipx_interface *intrfc = NULL;
struct datalink_proto *datalink;
if (!dev)
goto out;
/* Check addresses are suitable */
if (dev->addr_len > IPX_NODE_LEN)
goto out;
switch (ntohs(dlink_type)) {
case ETH_P_IPX: datalink = pEII_datalink; break;
case ETH_P_802_2: datalink = p8022_datalink; break;
case ETH_P_SNAP: datalink = pSNAP_datalink; break;
case ETH_P_802_3: datalink = p8023_datalink; break;
default: goto out;
}
intrfc = ipxitf_alloc(dev, 0, dlink_type, datalink, 0,
dev->hard_header_len + datalink->header_length);
if (intrfc) {
memset(intrfc->if_node, 0, IPX_NODE_LEN);
memcpy((char *)&(intrfc->if_node[IPX_NODE_LEN-dev->addr_len]),
dev->dev_addr, dev->addr_len);
spin_lock_init(&intrfc->if_sklist_lock);
atomic_set(&intrfc->refcnt, 1);
ipxitf_insert(intrfc);
dev_hold(dev);
}
out:
return intrfc;
}
static int ipxitf_ioctl(unsigned int cmd, void __user *arg)
{
int rc = -EINVAL;
struct ifreq ifr;
int val;
switch (cmd) {
case SIOCSIFADDR: {
struct sockaddr_ipx *sipx;
struct ipx_interface_definition f;
rc = -EFAULT;
if (copy_from_user(&ifr, arg, sizeof(ifr)))
break;
sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
rc = -EINVAL;
if (sipx->sipx_family != AF_IPX)
break;
f.ipx_network = sipx->sipx_network;
memcpy(f.ipx_device, ifr.ifr_name,
sizeof(f.ipx_device));
memcpy(f.ipx_node, sipx->sipx_node, IPX_NODE_LEN);
f.ipx_dlink_type = sipx->sipx_type;
f.ipx_special = sipx->sipx_special;
if (sipx->sipx_action == IPX_DLTITF)
rc = ipxitf_delete(&f);
else
rc = ipxitf_create(&f);
break;
}
case SIOCGIFADDR: {
struct sockaddr_ipx *sipx;
struct ipx_interface *ipxif;
struct net_device *dev;
rc = -EFAULT;
if (copy_from_user(&ifr, arg, sizeof(ifr)))
break;
sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
dev = __dev_get_by_name(&init_net, ifr.ifr_name);
rc = -ENODEV;
if (!dev)
break;
ipxif = ipxitf_find_using_phys(dev,
ipx_map_frame_type(sipx->sipx_type));
rc = -EADDRNOTAVAIL;
if (!ipxif)
break;
sipx->sipx_family = AF_IPX;
sipx->sipx_network = ipxif->if_netnum;
memcpy(sipx->sipx_node, ipxif->if_node,
sizeof(sipx->sipx_node));
rc = -EFAULT;
if (copy_to_user(arg, &ifr, sizeof(ifr)))
break;
ipxitf_put(ipxif);
rc = 0;
break;
}
case SIOCAIPXITFCRT:
rc = -EFAULT;
if (get_user(val, (unsigned char __user *) arg))
break;
rc = 0;
ipxcfg_auto_create_interfaces = val;
break;
case SIOCAIPXPRISLT:
rc = -EFAULT;
if (get_user(val, (unsigned char __user *) arg))
break;
rc = 0;
ipxcfg_set_auto_select(val);
break;
}
return rc;
}
/*
* Checksum routine for IPX
*/
/* Note: We assume ipx_tctrl==0 and htons(length)==ipx_pktsize */
/* This functions should *not* mess with packet contents */
__be16 ipx_cksum(struct ipxhdr *packet, int length)
{
/*
* NOTE: sum is a net byte order quantity, which optimizes the
* loop. This only works on big and little endian machines. (I
* don't know of a machine that isn't.)
*/
/* handle the first 3 words separately; checksum should be skipped
* and ipx_tctrl masked out */
__u16 *p = (__u16 *)packet;
__u32 sum = p[1] + (p[2] & (__force u16)htons(0x00ff));
__u32 i = (length >> 1) - 3; /* Number of remaining complete words */
/* Loop through them */
p += 3;
while (i--)
sum += *p++;
/* Add on the last part word if it exists */
if (packet->ipx_pktsize & htons(1))
sum += (__force u16)htons(0xff00) & *p;
/* Do final fixup */
sum = (sum & 0xffff) + (sum >> 16);
/* It's a pity there's no concept of carry in C */
if (sum >= 0x10000)
sum++;
/*
* Leave 0 alone; we don't want 0xffff here. Note that we can't get
* here with 0x10000, so this check is the same as ((__u16)sum)
*/
if (sum)
sum = ~sum;
return (__force __be16)sum;
}
const char *ipx_frame_name(__be16 frame)
{
char* rc = "None";
switch (ntohs(frame)) {
case ETH_P_IPX: rc = "EtherII"; break;
case ETH_P_802_2: rc = "802.2"; break;
case ETH_P_SNAP: rc = "SNAP"; break;
case ETH_P_802_3: rc = "802.3"; break;
case ETH_P_TR_802_2: rc = "802.2TR"; break;
}
return rc;
}
const char *ipx_device_name(struct ipx_interface *intrfc)
{
return intrfc->if_internal ? "Internal" :
intrfc->if_dev ? intrfc->if_dev->name : "Unknown";
}
/* Handling for system calls applied via the various interfaces to an IPX
* socket object. */
static int ipx_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
int opt;
int rc = -EINVAL;
lock_kernel();
if (optlen != sizeof(int))
goto out;
rc = -EFAULT;
if (get_user(opt, (unsigned int __user *)optval))
goto out;
rc = -ENOPROTOOPT;
if (!(level == SOL_IPX && optname == IPX_TYPE))
goto out;
ipx_sk(sk)->type = opt;
rc = 0;
out:
unlock_kernel();
return rc;
}
static int ipx_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
struct sock *sk = sock->sk;
int val = 0;
int len;
int rc = -ENOPROTOOPT;
lock_kernel();
if (!(level == SOL_IPX && optname == IPX_TYPE))
goto out;
val = ipx_sk(sk)->type;
rc = -EFAULT;
if (get_user(len, optlen))
goto out;
len = min_t(unsigned int, len, sizeof(int));
rc = -EINVAL;
if(len < 0)
goto out;
rc = -EFAULT;
if (put_user(len, optlen) || copy_to_user(optval, &val, len))
goto out;
rc = 0;
out:
unlock_kernel();
return rc;
}
static struct proto ipx_proto = {
.name = "IPX",
.owner = THIS_MODULE,
.obj_size = sizeof(struct ipx_sock),
};
static int ipx_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
int rc = -ESOCKTNOSUPPORT;
struct sock *sk;
if (!net_eq(net, &init_net))
return -EAFNOSUPPORT;
/*
* SPX support is not anymore in the kernel sources. If you want to
* ressurrect it, completing it and making it understand shared skbs,
* be fully multithreaded, etc, grab the sources in an early 2.5 kernel
* tree.
*/
if (sock->type != SOCK_DGRAM)
goto out;
rc = -ENOMEM;
sk = sk_alloc(net, PF_IPX, GFP_KERNEL, &ipx_proto);
if (!sk)
goto out;
sk_refcnt_debug_inc(sk);
sock_init_data(sock, sk);
sk->sk_no_check = 1; /* Checksum off by default */
sock->ops = &ipx_dgram_ops;
rc = 0;
out:
return rc;
}
static int ipx_release(struct socket *sock)
{
struct sock *sk = sock->sk;
if (!sk)
goto out;
lock_kernel();
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_state_change(sk);
sock_set_flag(sk, SOCK_DEAD);
sock->sk = NULL;
sk_refcnt_debug_release(sk);
ipx_destroy_socket(sk);
unlock_kernel();
out:
return 0;
}
/* caller must hold a reference to intrfc */
static __be16 ipx_first_free_socketnum(struct ipx_interface *intrfc)
{
unsigned short socketNum = intrfc->if_sknum;
spin_lock_bh(&intrfc->if_sklist_lock);
if (socketNum < IPX_MIN_EPHEMERAL_SOCKET)
socketNum = IPX_MIN_EPHEMERAL_SOCKET;
while (__ipxitf_find_socket(intrfc, htons(socketNum)))
if (socketNum > IPX_MAX_EPHEMERAL_SOCKET)
socketNum = IPX_MIN_EPHEMERAL_SOCKET;
else
socketNum++;
spin_unlock_bh(&intrfc->if_sklist_lock);
intrfc->if_sknum = socketNum;
return htons(socketNum);
}
static int __ipx_bind(struct socket *sock,
struct sockaddr *uaddr, int addr_len)
{
struct sock *sk = sock->sk;
struct ipx_sock *ipxs = ipx_sk(sk);
struct ipx_interface *intrfc;
struct sockaddr_ipx *addr = (struct sockaddr_ipx *)uaddr;
int rc = -EINVAL;
if (!sock_flag(sk, SOCK_ZAPPED) || addr_len != sizeof(struct sockaddr_ipx))
goto out;
intrfc = ipxitf_find_using_net(addr->sipx_network);
rc = -EADDRNOTAVAIL;
if (!intrfc)
goto out;
if (!addr->sipx_port) {
addr->sipx_port = ipx_first_free_socketnum(intrfc);
rc = -EINVAL;
if (!addr->sipx_port)
goto out_put;
}
/* protect IPX system stuff like routing/sap */
rc = -EACCES;
if (ntohs(addr->sipx_port) < IPX_MIN_EPHEMERAL_SOCKET &&
!capable(CAP_NET_ADMIN))
goto out_put;
ipxs->port = addr->sipx_port;
#ifdef CONFIG_IPX_INTERN
if (intrfc == ipx_internal_net) {
/* The source address is to be set explicitly if the
* socket is to be bound on the internal network. If a
* node number 0 was specified, the default is used.
*/
rc = -EINVAL;
if (!memcmp(addr->sipx_node, ipx_broadcast_node, IPX_NODE_LEN))
goto out_put;
if (!memcmp(addr->sipx_node, ipx_this_node, IPX_NODE_LEN))
memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN);
else
memcpy(ipxs->node, addr->sipx_node, IPX_NODE_LEN);
rc = -EADDRINUSE;
if (ipxitf_find_internal_socket(intrfc, ipxs->node,
ipxs->port)) {
SOCK_DEBUG(sk,
"IPX: bind failed because port %X in use.\n",
ntohs(addr->sipx_port));
goto out_put;
}
} else {
/* Source addresses are easy. It must be our
* network:node pair for an interface routed to IPX
* with the ipx routing ioctl()
*/
memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN);
rc = -EADDRINUSE;
if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
SOCK_DEBUG(sk,
"IPX: bind failed because port %X in use.\n",
ntohs(addr->sipx_port));
goto out_put;
}
}
#else /* !def CONFIG_IPX_INTERN */
/* Source addresses are easy. It must be our network:node pair for
an interface routed to IPX with the ipx routing ioctl() */
rc = -EADDRINUSE;
if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
SOCK_DEBUG(sk, "IPX: bind failed because port %X in use.\n",
ntohs((int)addr->sipx_port));
goto out_put;
}
#endif /* CONFIG_IPX_INTERN */
ipxitf_insert_socket(intrfc, sk);
sock_reset_flag(sk, SOCK_ZAPPED);
rc = 0;
out_put:
ipxitf_put(intrfc);
out:
return rc;
}
static int ipx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
int rc;
lock_kernel();
rc = __ipx_bind(sock, uaddr, addr_len);
unlock_kernel();
return rc;
}
static int ipx_connect(struct socket *sock, struct sockaddr *uaddr,
int addr_len, int flags)
{
struct sock *sk = sock->sk;
struct ipx_sock *ipxs = ipx_sk(sk);
struct sockaddr_ipx *addr;
int rc = -EINVAL;
struct ipx_route *rt;
sk->sk_state = TCP_CLOSE;
sock->state = SS_UNCONNECTED;
lock_kernel();
if (addr_len != sizeof(*addr))
goto out;
addr = (struct sockaddr_ipx *)uaddr;
/* put the autobinding in */
if (!ipxs->port) {
struct sockaddr_ipx uaddr;
uaddr.sipx_port = 0;
uaddr.sipx_network = 0;
#ifdef CONFIG_IPX_INTERN
rc = -ENETDOWN;
if (!ipxs->intrfc)
goto out; /* Someone zonked the iface */
memcpy(uaddr.sipx_node, ipxs->intrfc->if_node,
IPX_NODE_LEN);
#endif /* CONFIG_IPX_INTERN */
rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
sizeof(struct sockaddr_ipx));
if (rc)
goto out;
}
/* We can either connect to primary network or somewhere
* we can route to */
rt = ipxrtr_lookup(addr->sipx_network);
rc = -ENETUNREACH;
if (!rt && !(!addr->sipx_network && ipx_primary_net))
goto out;
ipxs->dest_addr.net = addr->sipx_network;
ipxs->dest_addr.sock = addr->sipx_port;
memcpy(ipxs->dest_addr.node, addr->sipx_node, IPX_NODE_LEN);
ipxs->type = addr->sipx_type;
if (sock->type == SOCK_DGRAM) {
sock->state = SS_CONNECTED;
sk->sk_state = TCP_ESTABLISHED;
}
if (rt)
ipxrtr_put(rt);
rc = 0;
out:
unlock_kernel();
return rc;
}
static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct ipx_address *addr;
struct sockaddr_ipx sipx;
struct sock *sk = sock->sk;
struct ipx_sock *ipxs = ipx_sk(sk);
int rc;
*uaddr_len = sizeof(struct sockaddr_ipx);
lock_kernel();
if (peer) {
rc = -ENOTCONN;
if (sk->sk_state != TCP_ESTABLISHED)
goto out;
addr = &ipxs->dest_addr;
sipx.sipx_network = addr->net;
sipx.sipx_port = addr->sock;
memcpy(sipx.sipx_node, addr->node, IPX_NODE_LEN);
} else {
if (ipxs->intrfc) {
sipx.sipx_network = ipxs->intrfc->if_netnum;
#ifdef CONFIG_IPX_INTERN
memcpy(sipx.sipx_node, ipxs->node, IPX_NODE_LEN);
#else
memcpy(sipx.sipx_node, ipxs->intrfc->if_node,
IPX_NODE_LEN);
#endif /* CONFIG_IPX_INTERN */
} else {
sipx.sipx_network = 0;
memset(sipx.sipx_node, '\0', IPX_NODE_LEN);
}
sipx.sipx_port = ipxs->port;
}
sipx.sipx_family = AF_IPX;
sipx.sipx_type = ipxs->type;
sipx.sipx_zero = 0;
memcpy(uaddr, &sipx, sizeof(sipx));
rc = 0;
out:
unlock_kernel();
return rc;
}
static unsigned int ipx_datagram_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
int rc;
lock_kernel();
rc = datagram_poll(file, sock, wait);
unlock_kernel();
return rc;
}
static int ipx_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
/* NULL here for pt means the packet was looped back */
struct ipx_interface *intrfc;
struct ipxhdr *ipx;
u16 ipx_pktsize;
int rc = 0;
if (!net_eq(dev_net(dev), &init_net))
goto drop;
/* Not ours */
if (skb->pkt_type == PACKET_OTHERHOST)
goto drop;
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
goto out;
if (!pskb_may_pull(skb, sizeof(struct ipxhdr)))
goto drop;
ipx_pktsize = ntohs(ipx_hdr(skb)->ipx_pktsize);
/* Too small or invalid header? */
if (ipx_pktsize < sizeof(struct ipxhdr) ||
!pskb_may_pull(skb, ipx_pktsize))
goto drop;
ipx = ipx_hdr(skb);
if (ipx->ipx_checksum != IPX_NO_CHECKSUM &&
ipx->ipx_checksum != ipx_cksum(ipx, ipx_pktsize))
goto drop;
IPX_SKB_CB(skb)->ipx_tctrl = ipx->ipx_tctrl;
IPX_SKB_CB(skb)->ipx_dest_net = ipx->ipx_dest.net;
IPX_SKB_CB(skb)->ipx_source_net = ipx->ipx_source.net;
/* Determine what local ipx endpoint this is */
intrfc = ipxitf_find_using_phys(dev, pt->type);
if (!intrfc) {
if (ipxcfg_auto_create_interfaces &&
IPX_SKB_CB(skb)->ipx_dest_net) {
intrfc = ipxitf_auto_create(dev, pt->type);
if (intrfc)
ipxitf_hold(intrfc);
}
if (!intrfc) /* Not one of ours */
/* or invalid packet for auto creation */
goto drop;
}
rc = ipxitf_rcv(intrfc, skb);
ipxitf_put(intrfc);
goto out;
drop:
kfree_skb(skb);
out:
return rc;
}
static int ipx_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
struct ipx_sock *ipxs = ipx_sk(sk);
struct sockaddr_ipx *usipx = (struct sockaddr_ipx *)msg->msg_name;
struct sockaddr_ipx local_sipx;
int rc = -EINVAL;
int flags = msg->msg_flags;
lock_kernel();
/* Socket gets bound below anyway */
/* if (sk->sk_zapped)
return -EIO; */ /* Socket not bound */
if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
goto out;
/* Max possible packet size limited by 16 bit pktsize in header */
if (len >= 65535 - sizeof(struct ipxhdr))
goto out;
if (usipx) {
if (!ipxs->port) {
struct sockaddr_ipx uaddr;
uaddr.sipx_port = 0;
uaddr.sipx_network = 0;
#ifdef CONFIG_IPX_INTERN
rc = -ENETDOWN;
if (!ipxs->intrfc)
goto out; /* Someone zonked the iface */
memcpy(uaddr.sipx_node, ipxs->intrfc->if_node,
IPX_NODE_LEN);
#endif
rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
sizeof(struct sockaddr_ipx));
if (rc)
goto out;
}
rc = -EINVAL;
if (msg->msg_namelen < sizeof(*usipx) ||
usipx->sipx_family != AF_IPX)
goto out;
} else {
rc = -ENOTCONN;
if (sk->sk_state != TCP_ESTABLISHED)
goto out;
usipx = &local_sipx;
usipx->sipx_family = AF_IPX;
usipx->sipx_type = ipxs->type;
usipx->sipx_port = ipxs->dest_addr.sock;
usipx->sipx_network = ipxs->dest_addr.net;
memcpy(usipx->sipx_node, ipxs->dest_addr.node, IPX_NODE_LEN);
}
rc = ipxrtr_route_packet(sk, usipx, msg->msg_iov, len,
flags & MSG_DONTWAIT);
if (rc >= 0)
rc = len;
out:
unlock_kernel();
return rc;
}
static int ipx_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size, int flags)
{
struct sock *sk = sock->sk;
struct ipx_sock *ipxs = ipx_sk(sk);
struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)msg->msg_name;
struct ipxhdr *ipx = NULL;
struct sk_buff *skb;
int copied, rc;
lock_kernel();
/* put the autobinding in */
if (!ipxs->port) {
struct sockaddr_ipx uaddr;
uaddr.sipx_port = 0;
uaddr.sipx_network = 0;
#ifdef CONFIG_IPX_INTERN
rc = -ENETDOWN;
if (!ipxs->intrfc)
goto out; /* Someone zonked the iface */
memcpy(uaddr.sipx_node, ipxs->intrfc->if_node, IPX_NODE_LEN);
#endif /* CONFIG_IPX_INTERN */
rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
sizeof(struct sockaddr_ipx));
if (rc)
goto out;
}
rc = -ENOTCONN;
if (sock_flag(sk, SOCK_ZAPPED))
goto out;
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &rc);
if (!skb)
goto out;
ipx = ipx_hdr(skb);
copied = ntohs(ipx->ipx_pktsize) - sizeof(struct ipxhdr);
if (copied > size) {
copied = size;
msg->msg_flags |= MSG_TRUNC;
}
rc = skb_copy_datagram_iovec(skb, sizeof(struct ipxhdr), msg->msg_iov,
copied);
if (rc)
goto out_free;
if (skb->tstamp.tv64)
sk->sk_stamp = skb->tstamp;
msg->msg_namelen = sizeof(*sipx);
if (sipx) {
sipx->sipx_family = AF_IPX;
sipx->sipx_port = ipx->ipx_source.sock;
memcpy(sipx->sipx_node, ipx->ipx_source.node, IPX_NODE_LEN);
sipx->sipx_network = IPX_SKB_CB(skb)->ipx_source_net;
sipx->sipx_type = ipx->ipx_type;
sipx->sipx_zero = 0;
}
rc = copied;
out_free:
skb_free_datagram(sk, skb);
out:
unlock_kernel();
return rc;
}
static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
int rc = 0;
long amount = 0;
struct sock *sk = sock->sk;
void __user *argp = (void __user *)arg;
lock_kernel();
switch (cmd) {
case TIOCOUTQ:
amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
if (amount < 0)
amount = 0;
rc = put_user(amount, (int __user *)argp);
break;
case TIOCINQ: {
struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
/* These two are safe on a single CPU system as only
* user tasks fiddle here */
if (skb)
amount = skb->len - sizeof(struct ipxhdr);
rc = put_user(amount, (int __user *)argp);
break;
}
case SIOCADDRT:
case SIOCDELRT:
rc = -EPERM;
if (capable(CAP_NET_ADMIN))
rc = ipxrtr_ioctl(cmd, argp);
break;
case SIOCSIFADDR:
case SIOCAIPXITFCRT:
case SIOCAIPXPRISLT:
rc = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
case SIOCGIFADDR:
rc = ipxitf_ioctl(cmd, argp);
break;
case SIOCIPXCFGDATA:
rc = ipxcfg_get_config_data(argp);
break;
case SIOCIPXNCPCONN:
/*
* This socket wants to take care of the NCP connection
* handed to us in arg.
*/
rc = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
rc = get_user(ipx_sk(sk)->ipx_ncp_conn,
(const unsigned short __user *)argp);
break;
case SIOCGSTAMP:
rc = -EINVAL;
if (sk)
rc = sock_get_timestamp(sk, argp);
break;
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
rc = -EINVAL;
break;
default:
rc = -ENOIOCTLCMD;
break;
}
unlock_kernel();
return rc;
}
#ifdef CONFIG_COMPAT
static int ipx_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
/*
* These 4 commands use same structure on 32bit and 64bit. Rest of IPX
* commands is handled by generic ioctl code. As these commands are
* SIOCPROTOPRIVATE..SIOCPROTOPRIVATE+3, they cannot be handled by generic
* code.
*/
switch (cmd) {
case SIOCAIPXITFCRT:
case SIOCAIPXPRISLT:
case SIOCIPXCFGDATA:
case SIOCIPXNCPCONN:
return ipx_ioctl(sock, cmd, arg);
default:
return -ENOIOCTLCMD;
}
}
#endif
/*
* Socket family declarations
*/
static const struct net_proto_family ipx_family_ops = {
.family = PF_IPX,
.create = ipx_create,
.owner = THIS_MODULE,
};
static const struct proto_ops ipx_dgram_ops = {
.family = PF_IPX,
.owner = THIS_MODULE,
.release = ipx_release,
.bind = ipx_bind,
.connect = ipx_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = ipx_getname,
.poll = ipx_datagram_poll,
.ioctl = ipx_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ipx_compat_ioctl,
#endif
.listen = sock_no_listen,
.shutdown = sock_no_shutdown, /* FIXME: support shutdown */
.setsockopt = ipx_setsockopt,
.getsockopt = ipx_getsockopt,
.sendmsg = ipx_sendmsg,
.recvmsg = ipx_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
};
static struct packet_type ipx_8023_packet_type __read_mostly = {
.type = cpu_to_be16(ETH_P_802_3),
.func = ipx_rcv,
};
static struct packet_type ipx_dix_packet_type __read_mostly = {
.type = cpu_to_be16(ETH_P_IPX),
.func = ipx_rcv,
};
static struct notifier_block ipx_dev_notifier = {
.notifier_call = ipxitf_device_event,
};
extern struct datalink_proto *make_EII_client(void);
extern void destroy_EII_client(struct datalink_proto *);
static const unsigned char ipx_8022_type = 0xE0;
static const unsigned char ipx_snap_id[5] = { 0x0, 0x0, 0x0, 0x81, 0x37 };
static const char ipx_EII_err_msg[] __initconst =
KERN_CRIT "IPX: Unable to register with Ethernet II\n";
static const char ipx_8023_err_msg[] __initconst =
KERN_CRIT "IPX: Unable to register with 802.3\n";
static const char ipx_llc_err_msg[] __initconst =
KERN_CRIT "IPX: Unable to register with 802.2\n";
static const char ipx_snap_err_msg[] __initconst =
KERN_CRIT "IPX: Unable to register with SNAP\n";
static int __init ipx_init(void)
{
int rc = proto_register(&ipx_proto, 1);
if (rc != 0)
goto out;
sock_register(&ipx_family_ops);
pEII_datalink = make_EII_client();
if (pEII_datalink)
dev_add_pack(&ipx_dix_packet_type);
else
printk(ipx_EII_err_msg);
p8023_datalink = make_8023_client();
if (p8023_datalink)
dev_add_pack(&ipx_8023_packet_type);
else
printk(ipx_8023_err_msg);
p8022_datalink = register_8022_client(ipx_8022_type, ipx_rcv);
if (!p8022_datalink)
printk(ipx_llc_err_msg);
pSNAP_datalink = register_snap_client(ipx_snap_id, ipx_rcv);
if (!pSNAP_datalink)
printk(ipx_snap_err_msg);
register_netdevice_notifier(&ipx_dev_notifier);
ipx_register_sysctl();
ipx_proc_init();
out:
return rc;
}
static void __exit ipx_proto_finito(void)
{
ipx_proc_exit();
ipx_unregister_sysctl();
unregister_netdevice_notifier(&ipx_dev_notifier);
ipxitf_cleanup();
if (pSNAP_datalink) {
unregister_snap_client(pSNAP_datalink);
pSNAP_datalink = NULL;
}
if (p8022_datalink) {
unregister_8022_client(p8022_datalink);
p8022_datalink = NULL;
}
dev_remove_pack(&ipx_8023_packet_type);
if (p8023_datalink) {
destroy_8023_client(p8023_datalink);
p8023_datalink = NULL;
}
dev_remove_pack(&ipx_dix_packet_type);
if (pEII_datalink) {
destroy_EII_client(pEII_datalink);
pEII_datalink = NULL;
}
proto_unregister(&ipx_proto);
sock_unregister(ipx_family_ops.family);
}
module_init(ipx_init);
module_exit(ipx_proto_finito);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_IPX);