ddp.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:52k
- /*
- * DDP: An implementation of the AppleTalk DDP protocol for
- * Ethernet 'ELAP'.
- *
- * Alan Cox <Alan.Cox@linux.org>
- *
- * With more than a little assistance from
- *
- * Wesley Craig <netatalk@umich.edu>
- *
- * Fixes:
- * Michael Callahan : Made routing work
- * Wesley Craig : Fix probing to listen to a
- * passed node id.
- * Alan Cox : Added send/recvmsg support
- * Alan Cox : Moved at. to protinfo in
- * socket.
- * Alan Cox : Added firewall hooks.
- * Alan Cox : Supports new ARPHRD_LOOPBACK
- * Christer Weinigel : Routing and /proc fixes.
- * Bradford Johnson : LocalTalk.
- * Tom Dyas : Module support.
- * Alan Cox : Hooks for PPP (based on the
- * LocalTalk hook).
- * Alan Cox : Posix bits
- * Alan Cox/Mike Freeman : Possible fix to NBP problems
- * Bradford Johnson : IP-over-DDP (experimental)
- * Jay Schulist : Moved IP-over-DDP to its own
- * driver file. (ipddp.c & ipddp.h)
- * Jay Schulist : Made work as module with
- * AppleTalk drivers, cleaned it.
- * Rob Newberry : Added proxy AARP and AARP
- * procfs, moved probing to AARP
- * module.
- * Adrian Sun/
- * Michael Zuelsdorff : fix for net.0 packets. don't
- * allow illegal ether/tokentalk
- * port assignment. we lose a
- * valid localtalk port as a
- * result.
- * Arnaldo C. de Melo : Cleanup, in preparation for
- * shared skb support 8)
- *
- * 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 <linux/config.h>
- #if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)
- #include <linux/module.h>
- #include <asm/uaccess.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/string.h>
- #include <linux/mm.h>
- #include <linux/socket.h>
- #include <linux/sockios.h>
- #include <linux/in.h>
- #include <linux/errno.h>
- #include <linux/interrupt.h>
- #include <linux/if_ether.h>
- #include <linux/notifier.h>
- #include <linux/netdevice.h>
- #include <linux/inetdevice.h>
- #include <linux/route.h>
- #include <linux/inet.h>
- #include <linux/etherdevice.h>
- #include <linux/if_arp.h>
- #include <linux/skbuff.h>
- #include <linux/spinlock.h>
- #include <linux/termios.h> /* For TIOCOUTQ/INQ */
- #include <net/datalink.h>
- #include <net/p8022.h>
- #include <net/psnap.h>
- #include <net/sock.h>
- #include <linux/ip.h>
- #include <net/route.h>
- #include <linux/atalk.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #include <linux/init.h>
- #ifdef CONFIG_PROC_FS
- extern void aarp_register_proc_fs(void);
- extern void aarp_unregister_proc_fs(void);
- #endif
- extern void aarp_cleanup_module(void);
- extern void aarp_probe_network(struct atalk_iface *atif);
- extern int aarp_proxy_probe_network(struct atalk_iface *atif,
- struct at_addr *sa);
- extern void aarp_proxy_remove(struct net_device *dev, struct at_addr *sa);
- #undef APPLETALK_DEBUG
- #ifdef APPLETALK_DEBUG
- #define DPRINT(x) print(x)
- #else
- #define DPRINT(x)
- #endif /* APPLETALK_DEBUG */
- #ifdef CONFIG_SYSCTL
- extern inline void atalk_register_sysctl(void);
- extern inline void atalk_unregister_sysctl(void);
- #endif /* CONFIG_SYSCTL */
- struct datalink_proto *ddp_dl, *aarp_dl;
- static struct proto_ops atalk_dgram_ops;
- /**************************************************************************
- * *
- * Handlers for the socket list. *
- * *
- **************************************************************************/
- static struct sock *atalk_sockets;
- static spinlock_t atalk_sockets_lock = SPIN_LOCK_UNLOCKED;
- extern inline void atalk_insert_socket(struct sock *sk)
- {
- spin_lock_bh(&atalk_sockets_lock);
- sk->next = atalk_sockets;
- if (sk->next)
- atalk_sockets->pprev = &sk->next;
- atalk_sockets = sk;
- sk->pprev = &atalk_sockets;
- spin_unlock_bh(&atalk_sockets_lock);
- }
- extern inline void atalk_remove_socket(struct sock *sk)
- {
- spin_lock_bh(&atalk_sockets_lock);
- if (sk->pprev) {
- if (sk->next)
- sk->next->pprev = sk->pprev;
- *sk->pprev = sk->next;
- sk->pprev = NULL;
- }
- spin_unlock_bh(&atalk_sockets_lock);
- }
- static struct sock *atalk_search_socket(struct sockaddr_at *to,
- struct atalk_iface *atif)
- {
- struct sock *s;
- spin_lock_bh(&atalk_sockets_lock);
- for (s = atalk_sockets; s; s = s->next) {
- if (to->sat_port != s->protinfo.af_at.src_port)
- continue;
- if (to->sat_addr.s_net == ATADDR_ANYNET &&
- to->sat_addr.s_node == ATADDR_BCAST &&
- s->protinfo.af_at.src_net == atif->address.s_net)
- break;
- if (to->sat_addr.s_net == s->protinfo.af_at.src_net &&
- (to->sat_addr.s_node == s->protinfo.af_at.src_node ||
- to->sat_addr.s_node == ATADDR_BCAST ||
- to->sat_addr.s_node == ATADDR_ANYNODE))
- break;
- /* XXXX.0 -- we got a request for this router. make sure
- * that the node is appropriately set. */
- if (to->sat_addr.s_node == ATADDR_ANYNODE &&
- to->sat_addr.s_net != ATADDR_ANYNET &&
- atif->address.s_node == s->protinfo.af_at.src_node) {
- to->sat_addr.s_node = atif->address.s_node;
- break;
- }
- }
- spin_unlock_bh(&atalk_sockets_lock);
- return s;
- }
- /*
- * Try to find a socket matching ADDR in the socket list,
- * if found then return it. If not, insert SK into the
- * socket list.
- *
- * This entire operation must execute atomically.
- */
- static struct sock *atalk_find_or_insert_socket(struct sock *sk,
- struct sockaddr_at *sat)
- {
- struct sock *s;
- spin_lock_bh(&atalk_sockets_lock);
- for (s = atalk_sockets; s; s = s->next)
- if (s->protinfo.af_at.src_net == sat->sat_addr.s_net &&
- s->protinfo.af_at.src_node == sat->sat_addr.s_node &&
- s->protinfo.af_at.src_port == sat->sat_port)
- break;
- if (!s) {
- /* Wheee, it's free, assign and insert. */
- sk->next = atalk_sockets;
- if (sk->next)
- atalk_sockets->pprev = &sk->next;
- atalk_sockets = sk;
- sk->pprev = &atalk_sockets;
- }
- spin_unlock_bh(&atalk_sockets_lock);
- return s;
- }
- static void atalk_destroy_timer(unsigned long data)
- {
- struct sock *sk = (struct sock *) data;
- if (!atomic_read(&sk->wmem_alloc) &&
- !atomic_read(&sk->rmem_alloc) && sk->dead) {
- sock_put(sk);
- MOD_DEC_USE_COUNT;
- } else {
- sk->timer.expires = jiffies + SOCK_DESTROY_TIME;
- add_timer(&sk->timer);
- }
- }
- extern inline void atalk_destroy_socket(struct sock *sk)
- {
- atalk_remove_socket(sk);
- skb_queue_purge(&sk->receive_queue);
- if (!atomic_read(&sk->wmem_alloc) &&
- !atomic_read(&sk->rmem_alloc) && sk->dead) {
- sock_put(sk);
- MOD_DEC_USE_COUNT;
- } else {
- init_timer(&sk->timer);
- sk->timer.expires = jiffies + SOCK_DESTROY_TIME;
- sk->timer.function = atalk_destroy_timer;
- sk->timer.data = (unsigned long) sk;
- add_timer(&sk->timer);
- }
- }
- /* Called from proc fs */
- static int atalk_get_info(char *buffer, char **start, off_t offset, int length)
- {
- off_t pos = 0;
- off_t begin = 0;
- int len = sprintf(buffer, "Type local_addr remote_addr tx_queue "
- "rx_queue st uidn");
- struct sock *s;
- /* Output the AppleTalk data for the /proc filesystem */
- spin_lock_bh(&atalk_sockets_lock);
- for (s = atalk_sockets; s; s = s->next) {
- len += sprintf(buffer + len,"%02X ", s->type);
- len += sprintf(buffer + len,"%04X:%02X:%02X ",
- ntohs(s->protinfo.af_at.src_net),
- s->protinfo.af_at.src_node,
- s->protinfo.af_at.src_port);
- len += sprintf(buffer + len,"%04X:%02X:%02X ",
- ntohs(s->protinfo.af_at.dest_net),
- s->protinfo.af_at.dest_node,
- s->protinfo.af_at.dest_port);
- len += sprintf(buffer + len,"%08X:%08X ",
- atomic_read(&s->wmem_alloc),
- atomic_read(&s->rmem_alloc));
- len += sprintf(buffer + len,"%02X %dn", s->state,
- SOCK_INODE(s->socket)->i_uid);
- /* Are we still dumping unwanted data then discard the record */
- pos = begin + len;
- if (pos < offset) {
- len = 0; /* Keep dumping into the buffer start */
- begin = pos;
- }
- if (pos > offset + length) /* We have dumped enough */
- break;
- }
- spin_unlock_bh(&atalk_sockets_lock);
- /* The data in question runs from begin to begin+len */
- *start = buffer + offset - begin; /* Start of wanted data */
- len -= offset - begin; /* Remove unwanted header data from length */
- if (len > length)
- len = length; /* Remove unwanted tail data from length */
- return len;
- }
- /**************************************************************************
- * *
- * Routing tables for the AppleTalk socket layer. *
- * *
- **************************************************************************/
- /* Anti-deadlock ordering is router_lock --> iface_lock -DaveM */
- static struct atalk_route *atalk_router_list;
- static rwlock_t atalk_router_lock = RW_LOCK_UNLOCKED;
- static struct atalk_iface *atalk_iface_list;
- static spinlock_t atalk_iface_lock = SPIN_LOCK_UNLOCKED;
- /* For probing devices or in a routerless network */
- static struct atalk_route atrtr_default;
- /* AppleTalk interface control */
- /*
- * Drop a device. Doesn't drop any of its routes - that is the caller's
- * problem. Called when we down the interface or delete the address.
- */
- static void atif_drop_device(struct net_device *dev)
- {
- struct atalk_iface **iface = &atalk_iface_list;
- struct atalk_iface *tmp;
- spin_lock_bh(&atalk_iface_lock);
- while ((tmp = *iface) != NULL) {
- if (tmp->dev == dev) {
- *iface = tmp->next;
- kfree(tmp);
- dev->atalk_ptr = NULL;
- MOD_DEC_USE_COUNT;
- } else
- iface = &tmp->next;
- }
- spin_unlock_bh(&atalk_iface_lock);
- }
- static struct atalk_iface *atif_add_device(struct net_device *dev,
- struct at_addr *sa)
- {
- struct atalk_iface *iface = kmalloc(sizeof(*iface), GFP_KERNEL);
- if (!iface)
- return NULL;
- iface->dev = dev;
- dev->atalk_ptr = iface;
- iface->address = *sa;
- iface->status = 0;
- spin_lock_bh(&atalk_iface_lock);
- iface->next = atalk_iface_list;
- atalk_iface_list = iface;
- spin_unlock_bh(&atalk_iface_lock);
- MOD_INC_USE_COUNT;
- return iface;
- }
- /* Perform phase 2 AARP probing on our tentative address */
- static int atif_probe_device(struct atalk_iface *atif)
- {
- int netrange = ntohs(atif->nets.nr_lastnet) -
- ntohs(atif->nets.nr_firstnet) + 1;
- int probe_net = ntohs(atif->address.s_net);
- int probe_node = atif->address.s_node;
- int netct, nodect;
- /* Offset the network we start probing with */
- if (probe_net == ATADDR_ANYNET) {
- probe_net = ntohs(atif->nets.nr_firstnet);
- if (netrange)
- probe_net += jiffies % netrange;
- }
- if (probe_node == ATADDR_ANYNODE)
- probe_node = jiffies & 0xFF;
- /* Scan the networks */
- atif->status |= ATIF_PROBE;
- for (netct = 0; netct <= netrange; netct++) {
- /* Sweep the available nodes from a given start */
- atif->address.s_net = htons(probe_net);
- for (nodect = 0; nodect < 256; nodect++) {
- atif->address.s_node = ((nodect+probe_node) & 0xFF);
- if (atif->address.s_node > 0 &&
- atif->address.s_node < 254) {
- /* Probe a proposed address */
- aarp_probe_network(atif);
- if (!(atif->status & ATIF_PROBE_FAIL)) {
- atif->status &= ~ATIF_PROBE;
- return 0;
- }
- }
- atif->status &= ~ATIF_PROBE_FAIL;
- }
- probe_net++;
- if (probe_net > ntohs(atif->nets.nr_lastnet))
- probe_net = ntohs(atif->nets.nr_firstnet);
- }
- atif->status &= ~ATIF_PROBE;
- return -EADDRINUSE; /* Network is full... */
- }
- /* Perform AARP probing for a proxy address */
- static int atif_proxy_probe_device(struct atalk_iface *atif,
- struct at_addr* proxy_addr)
- {
- int netrange = ntohs(atif->nets.nr_lastnet) -
- ntohs(atif->nets.nr_firstnet) + 1;
- /* we probe the interface's network */
- int probe_net = ntohs(atif->address.s_net);
- int probe_node = ATADDR_ANYNODE; /* we'll take anything */
- int netct, nodect;
- /* Offset the network we start probing with */
- if (probe_net == ATADDR_ANYNET) {
- probe_net = ntohs(atif->nets.nr_firstnet);
- if (netrange)
- probe_net += jiffies % netrange;
- }
- if (probe_node == ATADDR_ANYNODE)
- probe_node = jiffies & 0xFF;
-
- /* Scan the networks */
- for (netct = 0; netct <= netrange; netct++) {
- /* Sweep the available nodes from a given start */
- proxy_addr->s_net = htons(probe_net);
- for (nodect = 0; nodect < 256; nodect++) {
- proxy_addr->s_node = ((nodect + probe_node) & 0xFF);
- if (proxy_addr->s_node > 0 &&
- proxy_addr->s_node < 254) {
- /* Tell AARP to probe a proposed address */
- int ret = aarp_proxy_probe_network(atif,
- proxy_addr);
- if (ret != -EADDRINUSE)
- return ret;
- }
- }
- probe_net++;
- if (probe_net > ntohs(atif->nets.nr_lastnet))
- probe_net = ntohs(atif->nets.nr_firstnet);
- }
- return -EADDRINUSE; /* Network is full... */
- }
- struct at_addr *atalk_find_dev_addr(struct net_device *dev)
- {
- struct atalk_iface *iface = dev->atalk_ptr;
- return iface ? &iface->address : NULL;
- }
- static struct at_addr *atalk_find_primary(void)
- {
- struct atalk_iface *fiface = NULL;
- struct at_addr *retval;
- struct atalk_iface *iface;
- /*
- * Return a point-to-point interface only if
- * there is no non-ptp interface available.
- */
- spin_lock_bh(&atalk_iface_lock);
- for (iface = atalk_iface_list; iface; iface = iface->next) {
- if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
- fiface = iface;
- if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
- retval = &iface->address;
- goto out;
- }
- }
- if (fiface)
- retval = &fiface->address;
- else if (atalk_iface_list)
- retval = &atalk_iface_list->address;
- else
- retval = NULL;
- out: spin_unlock_bh(&atalk_iface_lock);
- return retval;
- }
- /*
- * Find a match for 'any network' - ie any of our interfaces with that
- * node number will do just nicely.
- */
- static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
- {
- struct atalk_iface *iface = dev->atalk_ptr;
- if (!iface || iface->status & ATIF_PROBE)
- return NULL;
- if (node == ATADDR_BCAST ||
- iface->address.s_node == node ||
- node == ATADDR_ANYNODE)
- return iface;
- return NULL;
- }
- /* Find a match for a specific network:node pair */
- static struct atalk_iface *atalk_find_interface(int net, int node)
- {
- struct atalk_iface *iface;
- spin_lock_bh(&atalk_iface_lock);
- for (iface = atalk_iface_list; iface; iface = iface->next) {
- if ((node == ATADDR_BCAST ||
- node == ATADDR_ANYNODE ||
- iface->address.s_node == node) &&
- iface->address.s_net == net &&
- !(iface->status & ATIF_PROBE))
- break;
- /* XXXX.0 -- net.0 returns the iface associated with net */
- if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
- ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
- ntohs(net) <= ntohs(iface->nets.nr_lastnet))
- break;
- }
- spin_unlock_bh(&atalk_iface_lock);
- return iface;
- }
- /*
- * Find a route for an AppleTalk packet. This ought to get cached in
- * the socket (later on...). We know about host routes and the fact
- * that a route must be direct to broadcast.
- */
- static struct atalk_route *atrtr_find(struct at_addr *target)
- {
- /*
- * we must search through all routes unless we find a
- * host route, because some host routes might overlap
- * network routes
- */
- struct atalk_route *net_route = NULL;
- struct atalk_route *r;
-
- read_lock_bh(&atalk_router_lock);
- for (r = atalk_router_list; r; r = r->next) {
- if (!(r->flags & RTF_UP))
- continue;
- if (r->target.s_net == target->s_net) {
- if (r->flags & RTF_HOST) {
- /*
- * if this host route is for the target,
- * the we're done
- */
- if (r->target.s_node == target->s_node)
- goto out;
- } else
- /*
- * this route will work if there isn't a
- * direct host route, so cache it
- */
- net_route = r;
- }
- }
-
- /*
- * if we found a network route but not a direct host
- * route, then return it
- */
- if (net_route)
- r = net_route;
- else if (atrtr_default.dev)
- r = &atrtr_default;
- else /* No route can be found */
- r = NULL;
- out: read_unlock_bh(&atalk_router_lock);
- return r;
- }
- /*
- * Given an AppleTalk network, find the device to use. This can be
- * a simple lookup.
- */
- struct net_device *atrtr_get_dev(struct at_addr *sa)
- {
- struct atalk_route *atr = atrtr_find(sa);
- return atr ? atr->dev : NULL;
- }
- /* Set up a default router */
- static void atrtr_set_default(struct net_device *dev)
- {
- atrtr_default.dev = dev;
- atrtr_default.flags = RTF_UP;
- atrtr_default.gateway.s_net = htons(0);
- atrtr_default.gateway.s_node = 0;
- }
- /*
- * Add a router. Basically make sure it looks valid and stuff the
- * entry in the list. While it uses netranges we always set them to one
- * entry to work like netatalk.
- */
- static int atrtr_create(struct rtentry *r, struct net_device *devhint)
- {
- struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
- struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
- struct atalk_route *rt;
- struct atalk_iface *iface, *riface;
- int retval;
- /*
- * Fixme: Raise/Lower a routing change semaphore for these
- * operations.
- */
- /* Validate the request */
- if (ta->sat_family != AF_APPLETALK)
- return -EINVAL;
- if (!devhint && ga->sat_family != AF_APPLETALK)
- return -EINVAL;
- /* Now walk the routing table and make our decisions */
- write_lock_bh(&atalk_router_lock);
- for (rt = atalk_router_list; rt; rt = rt->next) {
- if (r->rt_flags != rt->flags)
- continue;
- if (ta->sat_addr.s_net == rt->target.s_net) {
- if (!(rt->flags & RTF_HOST))
- break;
- if (ta->sat_addr.s_node == rt->target.s_node)
- break;
- }
- }
- if (!devhint) {
- riface = NULL;
- spin_lock_bh(&atalk_iface_lock);
- for (iface = atalk_iface_list; iface; iface = iface->next) {
- if (!riface &&
- ntohs(ga->sat_addr.s_net) >=
- ntohs(iface->nets.nr_firstnet) &&
- ntohs(ga->sat_addr.s_net) <=
- ntohs(iface->nets.nr_lastnet))
- riface = iface;
- if (ga->sat_addr.s_net == iface->address.s_net &&
- ga->sat_addr.s_node == iface->address.s_node)
- riface = iface;
- }
- spin_unlock_bh(&atalk_iface_lock);
- retval = -ENETUNREACH;
- if (!riface)
- goto out;
- devhint = riface->dev;
- }
- if (!rt) {
- rt = kmalloc(sizeof(struct atalk_route), GFP_ATOMIC);
- retval = -ENOBUFS;
- if (!rt)
- goto out;
- rt->next = atalk_router_list;
- atalk_router_list = rt;
- }
- /* Fill in the routing entry */
- rt->target = ta->sat_addr;
- rt->dev = devhint;
- rt->flags = r->rt_flags;
- rt->gateway = ga->sat_addr;
- retval = 0;
- out: write_unlock_bh(&atalk_router_lock);
- return retval;
- }
- /* Delete a route. Find it and discard it */
- static int atrtr_delete(struct at_addr * addr)
- {
- struct atalk_route **r = &atalk_router_list;
- int retval = 0;
- struct atalk_route *tmp;
- write_lock_bh(&atalk_router_lock);
- while ((tmp = *r) != NULL) {
- if (tmp->target.s_net == addr->s_net &&
- (!(tmp->flags&RTF_GATEWAY) ||
- tmp->target.s_node == addr->s_node)) {
- *r = tmp->next;
- kfree(tmp);
- goto out;
- }
- r = &tmp->next;
- }
- retval = -ENOENT;
- out: write_unlock_bh(&atalk_router_lock);
- return retval;
- }
- /*
- * Called when a device is downed. Just throw away any routes
- * via it.
- */
- void atrtr_device_down(struct net_device *dev)
- {
- struct atalk_route **r = &atalk_router_list;
- struct atalk_route *tmp;
- write_lock_bh(&atalk_router_lock);
- while ((tmp = *r) != NULL) {
- if (tmp->dev == dev) {
- *r = tmp->next;
- kfree(tmp);
- } else
- r = &tmp->next;
- }
- write_unlock_bh(&atalk_router_lock);
- if (atrtr_default.dev == dev)
- atrtr_set_default(NULL);
- }
- /* Actually down the interface */
- static inline void atalk_dev_down(struct net_device *dev)
- {
- atrtr_device_down(dev); /* Remove all routes for the device */
- aarp_device_down(dev); /* Remove AARP entries for the device */
- atif_drop_device(dev); /* Remove the device */
- }
- /*
- * A device event has occurred. Watch for devices going down and
- * delete our use of them (iface and route).
- */
- static int ddp_device_event(struct notifier_block *this, unsigned long event,
- void *ptr)
- {
- if (event == NETDEV_DOWN)
- /* Discard any use of this */
- atalk_dev_down((struct net_device *) ptr);
- return NOTIFY_DONE;
- }
- /* ioctl calls. Shouldn't even need touching */
- /* Device configuration ioctl calls */
- static int atif_ioctl(int cmd, void *arg)
- {
- static char aarp_mcast[6] = {0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF};
- struct ifreq atreq;
- struct netrange *nr;
- struct sockaddr_at *sa;
- struct net_device *dev;
- struct atalk_iface *atif;
- int ct;
- int limit;
- struct rtentry rtdef;
- int add_route;
- if (copy_from_user(&atreq, arg, sizeof(atreq)))
- return -EFAULT;
- dev = __dev_get_by_name(atreq.ifr_name);
- if (!dev)
- return -ENODEV;
- sa = (struct sockaddr_at*) &atreq.ifr_addr;
- atif = atalk_find_dev(dev);
- switch (cmd) {
- case SIOCSIFADDR:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- if (sa->sat_family != AF_APPLETALK)
- return -EINVAL;
- if (dev->type != ARPHRD_ETHER &&
- dev->type != ARPHRD_LOOPBACK &&
- dev->type != ARPHRD_LOCALTLK &&
- dev->type != ARPHRD_PPP)
- return -EPROTONOSUPPORT;
- nr = (struct netrange *) &sa->sat_zero[0];
- add_route = 1;
- /*
- * if this is a point-to-point iface, and we already
- * have an iface for this AppleTalk address, then we
- * should not add a route
- */
- if ((dev->flags & IFF_POINTOPOINT) &&
- atalk_find_interface(sa->sat_addr.s_net,
- sa->sat_addr.s_node)) {
- printk(KERN_DEBUG "AppleTalk: point-to-point "
- "interface added with "
- "existing addressn");
- add_route = 0;
- }
-
- /*
- * Phase 1 is fine on LocalTalk but we don't do
- * EtherTalk phase 1. Anyone wanting to add it go ahead.
- */
- if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
- return -EPROTONOSUPPORT;
- if (sa->sat_addr.s_node == ATADDR_BCAST ||
- sa->sat_addr.s_node == 254)
- return -EINVAL;
- if (atif) {
- /* Already setting address */
- if (atif->status & ATIF_PROBE)
- return -EBUSY;
- atif->address.s_net = sa->sat_addr.s_net;
- atif->address.s_node = sa->sat_addr.s_node;
- atrtr_device_down(dev); /* Flush old routes */
- } else {
- atif = atif_add_device(dev, &sa->sat_addr);
- if (!atif)
- return -ENOMEM;
- }
- atif->nets = *nr;
- /*
- * Check if the chosen address is used. If so we
- * error and atalkd will try another.
- */
- if (!(dev->flags & IFF_LOOPBACK) &&
- !(dev->flags & IFF_POINTOPOINT) &&
- atif_probe_device(atif) < 0) {
- atif_drop_device(dev);
- return -EADDRINUSE;
- }
- /* Hey it worked - add the direct routes */
- sa = (struct sockaddr_at *) &rtdef.rt_gateway;
- sa->sat_family = AF_APPLETALK;
- sa->sat_addr.s_net = atif->address.s_net;
- sa->sat_addr.s_node = atif->address.s_node;
- sa = (struct sockaddr_at *) &rtdef.rt_dst;
- rtdef.rt_flags = RTF_UP;
- sa->sat_family = AF_APPLETALK;
- sa->sat_addr.s_node = ATADDR_ANYNODE;
- if (dev->flags & IFF_LOOPBACK ||
- dev->flags & IFF_POINTOPOINT)
- rtdef.rt_flags |= RTF_HOST;
- /* Routerless initial state */
- if (nr->nr_firstnet == htons(0) &&
- nr->nr_lastnet == htons(0xFFFE)) {
- sa->sat_addr.s_net = atif->address.s_net;
- atrtr_create(&rtdef, dev);
- atrtr_set_default(dev);
- } else {
- limit = ntohs(nr->nr_lastnet);
- if (limit - ntohs(nr->nr_firstnet) > 4096) {
- printk(KERN_WARNING "Too many routes/"
- "iface.n");
- return -EINVAL;
- }
- if (add_route)
- for (ct = ntohs(nr->nr_firstnet);
- ct <= limit; ct++) {
- sa->sat_addr.s_net = htons(ct);
- atrtr_create(&rtdef, dev);
- }
- }
- dev_mc_add(dev, aarp_mcast, 6, 1);
- return 0;
- case SIOCGIFADDR:
- if (!atif)
- return -EADDRNOTAVAIL;
- sa->sat_family = AF_APPLETALK;
- sa->sat_addr = atif->address;
- break;
- case SIOCGIFBRDADDR:
- if (!atif)
- return -EADDRNOTAVAIL;
- sa->sat_family = AF_APPLETALK;
- sa->sat_addr.s_net = atif->address.s_net;
- sa->sat_addr.s_node = ATADDR_BCAST;
- break;
- case SIOCATALKDIFADDR:
- case SIOCDIFADDR:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- if (sa->sat_family != AF_APPLETALK)
- return -EINVAL;
- atalk_dev_down(dev);
- break;
- case SIOCSARP:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- if (sa->sat_family != AF_APPLETALK)
- return -EINVAL;
- if (!atif)
- return -EADDRNOTAVAIL;
- /*
- * for now, we only support proxy AARP on ELAP;
- * we should be able to do it for LocalTalk, too.
- */
- if (dev->type != ARPHRD_ETHER)
- return -EPROTONOSUPPORT;
- /*
- * atif points to the current interface on this network;
- * we aren't concerned about its current status (at
- * least for now), but it has all the settings about
- * the network we're going to probe. Consequently, it
- * must exist.
- */
- if (!atif)
- return -EADDRNOTAVAIL;
- nr = (struct netrange *) &(atif->nets);
- /*
- * Phase 1 is fine on Localtalk but we don't do
- * Ethertalk phase 1. Anyone wanting to add it go ahead.
- */
- if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
- return -EPROTONOSUPPORT;
- if (sa->sat_addr.s_node == ATADDR_BCAST ||
- sa->sat_addr.s_node == 254)
- return -EINVAL;
- /*
- * Check if the chosen address is used. If so we
- * error and ATCP will try another.
- */
- if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
- return -EADDRINUSE;
-
- /*
- * We now have an address on the local network, and
- * the AARP code will defend it for us until we take it
- * down. We don't set up any routes right now, because
- * ATCP will install them manually via SIOCADDRT.
- */
- break;
- case SIOCDARP:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- if (sa->sat_family != AF_APPLETALK)
- return -EINVAL;
- if (!atif)
- return -EADDRNOTAVAIL;
- /* give to aarp module to remove proxy entry */
- aarp_proxy_remove(atif->dev, &(sa->sat_addr));
- return 0;
- }
- return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
- }
- /* Routing ioctl() calls */
- static int atrtr_ioctl(unsigned int cmd, void *arg)
- {
- struct net_device *dev = NULL;
- struct rtentry rt;
- if (copy_from_user(&rt, arg, sizeof(rt)))
- return -EFAULT;
- switch (cmd) {
- case SIOCDELRT:
- if (rt.rt_dst.sa_family != AF_APPLETALK)
- return -EINVAL;
- return atrtr_delete(&((struct sockaddr_at *)
- &rt.rt_dst)->sat_addr);
- case SIOCADDRT:
- /* FIXME: the name of the device is still in user
- * space, isn't it? */
- if (rt.rt_dev) {
- dev = __dev_get_by_name(rt.rt_dev);
- if (!dev)
- return -ENODEV;
- }
- return atrtr_create(&rt, dev);
- }
- return -EINVAL;
- }
- /* Called from proc fs - just make it print the ifaces neatly */
- static int atalk_if_get_info(char *buffer, char **start, off_t offset,
- int length)
- {
- off_t pos = 0;
- off_t begin = 0;
- struct atalk_iface *iface;
- int len = sprintf(buffer, "Interface Address "
- "Networks Statusn");
- spin_lock_bh(&atalk_iface_lock);
- for (iface = atalk_iface_list; iface; iface = iface->next) {
- len += sprintf(buffer+len,"%-16s %04X:%02X %04X-%04X %dn",
- iface->dev->name, ntohs(iface->address.s_net),
- iface->address.s_node,
- ntohs(iface->nets.nr_firstnet),
- ntohs(iface->nets.nr_lastnet), iface->status);
- pos = begin + len;
- if (pos < offset) {
- len = 0;
- begin = pos;
- }
- if (pos > offset + length)
- break;
- }
- spin_unlock_bh(&atalk_iface_lock);
- *start = buffer + (offset - begin);
- len -= (offset - begin);
- if (len > length)
- len = length;
- return len;
- }
- /* Called from proc fs - just make it print the routes neatly */
- static int atalk_rt_get_info(char *buffer, char **start, off_t offset,
- int length)
- {
- off_t pos = 0;
- off_t begin = 0;
- int len = sprintf(buffer, "Target Router Flags Devn");
- struct atalk_route *rt;
- if (atrtr_default.dev) {
- rt = &atrtr_default;
- len += sprintf(buffer + len,"Default %04X:%02X %-4d %sn",
- ntohs(rt->gateway.s_net), rt->gateway.s_node,
- rt->flags, rt->dev->name);
- }
- read_lock_bh(&atalk_router_lock);
- for (rt = atalk_router_list; rt; rt = rt->next) {
- len += sprintf(buffer + len,
- "%04X:%02X %04X:%02X %-4d %sn",
- ntohs(rt->target.s_net), rt->target.s_node,
- ntohs(rt->gateway.s_net), rt->gateway.s_node,
- rt->flags, rt->dev->name);
- pos = begin + len;
- if (pos < offset) {
- len = 0;
- begin = pos;
- }
- if (pos > offset + length)
- break;
- }
- read_unlock_bh(&atalk_router_lock);
- *start = buffer + (offset - begin);
- len -= (offset - begin);
- if (len > length)
- len = length;
- return len;
- }
- /**************************************************************************
- * *
- * Handling for system calls applied via the various interfaces to an *
- * AppleTalk socket object. *
- * *
- **************************************************************************/
- /*
- * Checksum: This is 'optional'. It's quite likely also a good
- * candidate for assembler hackery 8)
- */
- unsigned short atalk_checksum(struct ddpehdr *ddp, int len)
- {
- unsigned long sum = 0; /* Assume unsigned long is >16 bits */
- unsigned char *data = (unsigned char *) ddp;
- len -= 4; /* skip header 4 bytes */
- data += 4;
- /* This ought to be unwrapped neatly. I'll trust gcc for now */
- while (len--) {
- sum += *data;
- sum <<= 1;
- if (sum & 0x10000) {
- sum++;
- sum &= 0xFFFF;
- }
- data++;
- }
- /* Use 0xFFFF for 0. 0 itself means none */
- return sum ? htons((unsigned short) sum) : 0xFFFF;
- }
- /*
- * Create a socket. Initialise the socket, blank the addresses
- * set the state.
- */
- static int atalk_create(struct socket *sock, int protocol)
- {
- struct sock *sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, 1);
- if (!sk)
- return -ENOMEM;
- switch (sock->type) {
- /*
- * We permit SOCK_DGRAM and RAW is an extension. It is
- * trivial to do and gives you the full ELAP frame.
- * Should be handy for CAP 8)
- */
- case SOCK_RAW:
- case SOCK_DGRAM:
- sock->ops = &atalk_dgram_ops;
- break;
-
- case SOCK_STREAM:
- /*
- * TODO: if you want to implement ADSP, here's the
- * place to start
- */
- /*
- sock->ops = &atalk_stream_ops;
- break;
- */
- default:
- sk_free(sk);
- return -ESOCKTNOSUPPORT;
- }
- MOD_INC_USE_COUNT;
- sock_init_data(sock, sk);
- sk->destruct = NULL;
- /* Checksums on by default */
- sk->zapped = 1;
- return 0;
- }
- /* Free a socket. No work needed */
- static int atalk_release(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- if (!sk)
- return 0;
- if (!sk->dead)
- sk->state_change(sk);
- sk->dead = 1;
- sock->sk = NULL;
- atalk_destroy_socket(sk);
- return 0;
- }
- /*
- * Pick a source port when one is not given. If we can
- * find a suitable free one, we insert the socket into
- * the tables using it.
- *
- * This whole operation must be atomic.
- */
- static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
- {
- struct sock *s;
- int retval;
- spin_lock_bh(&atalk_sockets_lock);
- for (sat->sat_port = ATPORT_RESERVED;
- sat->sat_port < ATPORT_LAST;
- sat->sat_port++) {
- for (s = atalk_sockets; s; s = s->next) {
- if (s->protinfo.af_at.src_net == sat->sat_addr.s_net &&
- s->protinfo.af_at.src_node ==
- sat->sat_addr.s_node &&
- s->protinfo.af_at.src_port == sat->sat_port)
- goto try_next_port;
- }
- /* Wheee, it's free, assign and insert. */
- sk->next = atalk_sockets;
- if (sk->next)
- atalk_sockets->pprev = &sk->next;
- atalk_sockets = sk;
- sk->pprev = &atalk_sockets;
- sk->protinfo.af_at.src_port = sat->sat_port;
- retval = 0;
- goto out;
- try_next_port:
- ;
- }
- retval = -EBUSY;
- out: spin_unlock_bh(&atalk_sockets_lock);
- return retval;
- }
- static int atalk_autobind(struct sock *sk)
- {
- struct sockaddr_at sat;
- int n;
- struct at_addr *ap = atalk_find_primary();
- if (!ap || ap->s_net == htons(ATADDR_ANYNET))
- return -EADDRNOTAVAIL;
- sk->protinfo.af_at.src_net = sat.sat_addr.s_net = ap->s_net;
- sk->protinfo.af_at.src_node = sat.sat_addr.s_node = ap->s_node;
- n = atalk_pick_and_bind_port(sk, &sat);
- if (n < 0)
- return n;
- sk->zapped = 0;
- return 0;
- }
- /* Set the address 'our end' of the connection */
- static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
- {
- struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
- struct sock *sk = sock->sk;
- if (!sk->zapped || addr_len != sizeof(struct sockaddr_at))
- return -EINVAL;
- if (addr->sat_family != AF_APPLETALK)
- return -EAFNOSUPPORT;
- if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
- struct at_addr *ap = atalk_find_primary();
- if (!ap)
- return -EADDRNOTAVAIL;
- sk->protinfo.af_at.src_net = addr->sat_addr.s_net = ap->s_net;
- sk->protinfo.af_at.src_node = addr->sat_addr.s_node= ap->s_node;
- } else {
- if (!atalk_find_interface(addr->sat_addr.s_net,
- addr->sat_addr.s_node))
- return -EADDRNOTAVAIL;
- sk->protinfo.af_at.src_net = addr->sat_addr.s_net;
- sk->protinfo.af_at.src_node = addr->sat_addr.s_node;
- }
- if (addr->sat_port == ATADDR_ANYPORT) {
- int n = atalk_pick_and_bind_port(sk, addr);
- if (n < 0)
- return n;
- } else {
- sk->protinfo.af_at.src_port = addr->sat_port;
- if (atalk_find_or_insert_socket(sk, addr))
- return -EADDRINUSE;
- }
- sk->zapped = 0;
- return 0;
- }
- /* Set the address we talk to */
- static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
- int addr_len, int flags)
- {
- struct sock *sk = sock->sk;
- struct sockaddr_at *addr;
- sk->state = TCP_CLOSE;
- sock->state = SS_UNCONNECTED;
- if (addr_len != sizeof(*addr))
- return -EINVAL;
- addr = (struct sockaddr_at *)uaddr;
- if (addr->sat_family != AF_APPLETALK)
- return -EAFNOSUPPORT;
- if (addr->sat_addr.s_node == ATADDR_BCAST && !sk->broadcast) {
- #if 1
- printk(KERN_WARNING "%s is broken and did not set "
- "SO_BROADCAST. It will break when 2.2 is "
- "released.n",
- current->comm);
- #else
- return -EACCES;
- #endif
- }
- if (sk->zapped)
- if (atalk_autobind(sk) < 0)
- return -EBUSY;
- if (!atrtr_get_dev(&addr->sat_addr))
- return -ENETUNREACH;
- sk->protinfo.af_at.dest_port = addr->sat_port;
- sk->protinfo.af_at.dest_net = addr->sat_addr.s_net;
- sk->protinfo.af_at.dest_node = addr->sat_addr.s_node;
- sock->state = SS_CONNECTED;
- sk->state = TCP_ESTABLISHED;
- return 0;
- }
- /*
- * Find the name of an AppleTalk socket. Just copy the right
- * fields into the sockaddr.
- */
- static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
- int *uaddr_len, int peer)
- {
- struct sockaddr_at sat;
- struct sock *sk = sock->sk;
- if (sk->zapped)
- if (atalk_autobind(sk) < 0)
- return -ENOBUFS;
- *uaddr_len = sizeof(struct sockaddr_at);
- if (peer) {
- if (sk->state != TCP_ESTABLISHED)
- return -ENOTCONN;
- sat.sat_addr.s_net = sk->protinfo.af_at.dest_net;
- sat.sat_addr.s_node = sk->protinfo.af_at.dest_node;
- sat.sat_port = sk->protinfo.af_at.dest_port;
- } else {
- sat.sat_addr.s_net = sk->protinfo.af_at.src_net;
- sat.sat_addr.s_node = sk->protinfo.af_at.src_node;
- sat.sat_port = sk->protinfo.af_at.src_port;
- }
- sat.sat_family = AF_APPLETALK;
- memcpy(uaddr, &sat, sizeof(sat));
- return 0;
- }
- /*
- * Receive a packet (in skb) from device dev. This has come from the SNAP
- * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP
- * header, skb->len is the DDP length. The physical headers have been
- * extracted. PPP should probably pass frames marked as for this layer.
- * [ie ARPHRD_ETHERTALK]
- */
- static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt)
- {
- struct ddpehdr *ddp = (void *) skb->h.raw;
- struct sock *sock;
- struct atalk_iface *atif;
- struct sockaddr_at tosat;
- int origlen;
- struct ddpebits ddphv;
- /* Size check */
- if (skb->len < sizeof(*ddp))
- goto freeit;
- /*
- * Fix up the length field [Ok this is horrible but otherwise
- * I end up with unions of bit fields and messy bit field order
- * compiler/endian dependencies..]
- *
- * FIXME: This is a write to a shared object. Granted it
- * happens to be safe BUT.. (Its safe as user space will not
- * run until we put it back)
- */
- *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
- /* Trim buffer in case of stray trailing data */
- origlen = skb->len;
- skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len));
- /*
- * Size check to see if ddp->deh_len was crap
- * (Otherwise we'll detonate most spectacularly
- * in the middle of recvmsg()).
- */
- if (skb->len < sizeof(*ddp))
- goto freeit;
- /*
- * Any checksums. Note we don't do htons() on this == is assumed to be
- * valid for net byte orders all over the networking code...
- */
- if (ddp->deh_sum &&
- atalk_checksum(ddp, ddphv.deh_len) != ddp->deh_sum)
- /* Not a valid AppleTalk frame - dustbin time */
- goto freeit;
- /* Check the packet is aimed at us */
- if (!ddp->deh_dnet) /* Net 0 is 'this network' */
- atif = atalk_find_anynet(ddp->deh_dnode, dev);
- else
- atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
- /* Not ours, so we route the packet via the correct AppleTalk iface */
- if (!atif) {
- struct atalk_route *rt;
- struct at_addr ta;
- /*
- * Don't route multicast, etc., packets, or packets
- * sent to "this network"
- */
- if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
- /* FIXME:
- * Can it ever happen that a packet is from a PPP
- * iface and needs to be broadcast onto the default
- * network? */
- if (dev->type == ARPHRD_PPP)
- printk(KERN_DEBUG "AppleTalk: didn't forward "
- "broadcast packet received "
- "from PPP ifacen");
- goto freeit;
- }
- ta.s_net = ddp->deh_dnet;
- ta.s_node = ddp->deh_dnode;
- /* Route the packet */
- rt = atrtr_find(&ta);
- if (!rt || ddphv.deh_hops == DDP_MAXHOPS)
- goto freeit;
- ddphv.deh_hops++;
- /*
- * Route goes through another gateway, so
- * set the target to the gateway instead.
- */
- if (rt->flags & RTF_GATEWAY) {
- ta.s_net = rt->gateway.s_net;
- ta.s_node = rt->gateway.s_node;
- }
- /* Fix up skb->len field */
- skb_trim(skb, min_t(unsigned int, origlen, rt->dev->hard_header_len +
- ddp_dl->header_length + ddphv.deh_len));
- /* Mend the byte order */
- *((__u16 *)ddp) = ntohs(*((__u16 *)&ddphv));
- /*
- * Send the buffer onwards
- *
- * Now we must always be careful. If it's come from
- * LocalTalk to EtherTalk it might not fit
- *
- * Order matters here: If a packet has to be copied
- * to make a new headroom (rare hopefully) then it
- * won't need unsharing.
- *
- * Note. ddp-> becomes invalid at the realloc.
- */
- if (skb_headroom(skb) < 22) {
- /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
- struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
- kfree_skb(skb);
- if (!nskb)
- goto out;
- skb = nskb;
- } else
- skb = skb_unshare(skb, GFP_ATOMIC);
-
- /*
- * If the buffer didn't vanish into the lack of
- * space bitbucket we can send it.
- */
- if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
- goto freeit;
- goto out;
- }
- #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
- /* Check if IP-over-DDP */
- if (skb->data[12] == 22) {
- struct net_device *dev = __dev_get_by_name("ipddp0");
- struct net_device_stats *stats;
- /* This needs to be able to handle ipddp"N" devices */
- if (!dev)
- return -ENODEV;
- skb->protocol = htons(ETH_P_IP);
- skb_pull(skb, 13);
- skb->dev = dev;
- skb->h.raw = skb->data;
- stats = dev->priv;
- stats->rx_packets++;
- stats->rx_bytes += skb->len + 13;
- netif_rx(skb); /* Send the SKB up to a higher place. */
- goto out;
- }
- #endif
- /*
- * Which socket - atalk_search_socket() looks for a *full match*
- * of the <net,node,port> tuple.
- */
- tosat.sat_addr.s_net = ddp->deh_dnet;
- tosat.sat_addr.s_node = ddp->deh_dnode;
- tosat.sat_port = ddp->deh_dport;
- sock = atalk_search_socket(&tosat, atif);
- if (!sock) /* But not one of our sockets */
- goto freeit;
- /* Queue packet (standard) */
- skb->sk = sock;
- if (sock_queue_rcv_skb(sock, skb) < 0)
- goto freeit;
- goto out;
- freeit: kfree_skb(skb);
- out: return 0;
- }
- /*
- * Receive a LocalTalk frame. We make some demands on the caller here.
- * Caller must provide enough headroom on the packet to pull the short
- * header and append a long one.
- */
- static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt)
- {
- struct ddpehdr *ddp;
- struct at_addr *ap;
- /* Expand any short form frames */
- if (skb->mac.raw[2] == 1) {
- /* Find our address */
- ap = atalk_find_dev_addr(dev);
- if (!ap || skb->len < sizeof(struct ddpshdr)) {
- kfree_skb(skb);
- return 0;
- }
- /*
- * The push leaves us with a ddephdr not an shdr, and
- * handily the port bytes in the right place preset.
- */
- skb_push(skb, sizeof(*ddp) - 4);
- ddp = (struct ddpehdr *)skb->data;
- /* Now fill in the long header */
- /*
- * These two first. The mac overlays the new source/dest
- * network information so we MUST copy these before
- * we write the network numbers !
- */
- ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */
- ddp->deh_snode = skb->mac.raw[1]; /* From physical header */
- ddp->deh_dnet = ap->s_net; /* Network number */
- ddp->deh_snet = ap->s_net;
- ddp->deh_sum = 0; /* No checksum */
- /*
- * Not sure about this bit...
- */
- ddp->deh_len = skb->len;
- ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop
- if we slip up later */
- /* Mend the byte order */
- *((__u16 *)ddp) = htons(*((__u16 *)ddp));
- }
- skb->h.raw = skb->data;
- return atalk_rcv(skb, dev, pt);
- }
- static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, int len,
- struct scm_cookie *scm)
- {
- struct sock *sk = sock->sk;
- struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name;
- int flags = msg->msg_flags;
- int loopback = 0;
- struct sockaddr_at local_satalk, gsat;
- struct sk_buff *skb;
- struct net_device *dev;
- struct ddpehdr *ddp;
- int size;
- struct atalk_route *rt;
- int err;
- if (flags & ~MSG_DONTWAIT)
- return -EINVAL;
- if (len > DDP_MAXSZ)
- return -EMSGSIZE;
- if (usat) {
- if (sk->zapped)
- if (atalk_autobind(sk) < 0)
- return -EBUSY;
- if (msg->msg_namelen < sizeof(*usat) ||
- usat->sat_family != AF_APPLETALK)
- return -EINVAL;
- /* netatalk doesn't implement this check */
- if (usat->sat_addr.s_node == ATADDR_BCAST && !sk->broadcast) {
- printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as "
- "it will break before 2.2n");
- #if 0
- return -EPERM;
- #endif
- }
- } else {
- if (sk->state != TCP_ESTABLISHED)
- return -ENOTCONN;
- usat = &local_satalk;
- usat->sat_family = AF_APPLETALK;
- usat->sat_port = sk->protinfo.af_at.dest_port;
- usat->sat_addr.s_node = sk->protinfo.af_at.dest_node;
- usat->sat_addr.s_net = sk->protinfo.af_at.dest_net;
- }
- /* Build a packet */
- SOCK_DEBUG(sk, "SK %p: Got address.n", sk);
- /* For headers */
- size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
- if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
- rt = atrtr_find(&usat->sat_addr);
- if (!rt)
- return -ENETUNREACH;
- dev = rt->dev;
- } else {
- struct at_addr at_hint;
- at_hint.s_node = 0;
- at_hint.s_net = sk->protinfo.af_at.src_net;
- rt = atrtr_find(&at_hint);
- if (!rt)
- return -ENETUNREACH;
- dev = rt->dev;
- }
- SOCK_DEBUG(sk, "SK %p: Size needed %d, device %sn",
- sk, size, dev->name);
- size += dev->hard_header_len;
- skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
- if (!skb)
- return err;
-
- skb->sk = sk;
- skb_reserve(skb, ddp_dl->header_length);
- skb_reserve(skb, dev->hard_header_len);
- skb->dev = dev;
- SOCK_DEBUG(sk, "SK %p: Begin build.n", sk);
- ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr));
- ddp->deh_pad = 0;
- ddp->deh_hops = 0;
- ddp->deh_len = len + sizeof(*ddp);
- /*
- * Fix up the length field [Ok this is horrible but otherwise
- * I end up with unions of bit fields and messy bit field order
- * compiler/endian dependencies..
- */
- *((__u16 *)ddp) = ntohs(*((__u16 *)ddp));
- ddp->deh_dnet = usat->sat_addr.s_net;
- ddp->deh_snet = sk->protinfo.af_at.src_net;
- ddp->deh_dnode = usat->sat_addr.s_node;
- ddp->deh_snode = sk->protinfo.af_at.src_node;
- ddp->deh_dport = usat->sat_port;
- ddp->deh_sport = sk->protinfo.af_at.src_port;
- SOCK_DEBUG(sk, "SK %p: Copy user data (%d bytes).n", sk, len);
- err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
- if (err) {
- kfree_skb(skb);
- return -EFAULT;
- }
- if (sk->no_check == 1)
- ddp->deh_sum = 0;
- else
- ddp->deh_sum = atalk_checksum(ddp, len + sizeof(*ddp));
- /*
- * Loopback broadcast packets to non gateway targets (ie routes
- * to group we are in)
- */
- if (ddp->deh_dnode == ATADDR_BCAST &&
- !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
- struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
- if (skb2) {
- loopback = 1;
- SOCK_DEBUG(sk, "SK %p: send out(copy).n", sk);
- if (aarp_send_ddp(dev, skb2,
- &usat->sat_addr, NULL) == -1)
- kfree_skb(skb2);
- /* else queued/sent above in the aarp queue */
- }
- }
- if (dev->flags & IFF_LOOPBACK || loopback) {
- SOCK_DEBUG(sk, "SK %p: Loop back.n", sk);
- /* loop back */
- skb_orphan(skb);
- ddp_dl->datalink_header(ddp_dl, skb, dev->dev_addr);
- skb->mac.raw = skb->data;
- skb->h.raw = skb->data + ddp_dl->header_length +
- dev->hard_header_len;
- skb_pull(skb, dev->hard_header_len);
- skb_pull(skb, ddp_dl->header_length);
- atalk_rcv(skb, dev, NULL);
- } else {
- SOCK_DEBUG(sk, "SK %p: send out.n", sk);
- if (rt->flags & RTF_GATEWAY) {
- gsat.sat_addr = rt->gateway;
- usat = &gsat;
- }
- if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
- kfree_skb(skb);
- /* else queued/sent above in the aarp queue */
- }
- SOCK_DEBUG(sk, "SK %p: Done write (%d).n", sk, len);
- return len;
- }
- static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, int size,
- int flags, struct scm_cookie *scm)
- {
- struct sock *sk = sock->sk;
- struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name;
- struct ddpehdr *ddp = NULL;
- int copied = 0;
- int err = 0;
- struct ddpebits ddphv;
- struct sk_buff *skb;
- skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
- flags & MSG_DONTWAIT, &err);
- if (!skb)
- return err;
- ddp = (struct ddpehdr *)(skb->h.raw);
- *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp));
- if (sk->type == SOCK_RAW) {
- copied = ddphv.deh_len;
- if (copied > size) {
- copied = size;
- msg->msg_flags |= MSG_TRUNC;
- }
- err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
- } else {
- copied = ddphv.deh_len - sizeof(*ddp);
- if (copied > size) {
- copied = size;
- msg->msg_flags |= MSG_TRUNC;
- }
- err = skb_copy_datagram_iovec(skb, sizeof(*ddp),
- msg->msg_iov, copied);
- }
- if (!err) {
- if (sat) {
- sat->sat_family = AF_APPLETALK;
- sat->sat_port = ddp->deh_sport;
- sat->sat_addr.s_node = ddp->deh_snode;
- sat->sat_addr.s_net = ddp->deh_snet;
- }
- msg->msg_namelen = sizeof(*sat);
- }
- skb_free_datagram(sk, skb); /* Free the datagram. */
- return err ? err : copied;
- }
- /*
- * AppleTalk ioctl calls.
- */
- static int atalk_ioctl(struct socket *sock,unsigned int cmd, unsigned long arg)
- {
- long amount = 0;
- struct sock *sk = sock->sk;
- switch (cmd) {
- /* Protocol layer */
- case TIOCOUTQ:
- amount = sk->sndbuf - atomic_read(&sk->wmem_alloc);
- if (amount < 0)
- amount = 0;
- break;
- case TIOCINQ:
- {
- /* These two are safe on a single CPU system as only
- * user tasks fiddle here */
- struct sk_buff *skb = skb_peek(&sk->receive_queue);
- if (skb)
- amount = skb->len-sizeof(struct ddpehdr);
- break;
- }
- case SIOCGSTAMP:
- if (!sk)
- return -EINVAL;
- if (!sk->stamp.tv_sec)
- return -ENOENT;
- return copy_to_user((void *)arg, &sk->stamp,
- sizeof(struct timeval)) ? -EFAULT : 0;
- /* Routing */
- case SIOCADDRT:
- case SIOCDELRT:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- return atrtr_ioctl(cmd, (void *)arg);
- /* Interface */
- case SIOCGIFADDR:
- case SIOCSIFADDR:
- case SIOCGIFBRDADDR:
- case SIOCATALKDIFADDR:
- case SIOCDIFADDR:
- case SIOCSARP: /* proxy AARP */
- case SIOCDARP: /* proxy AARP */
- {
- int ret;
- rtnl_lock();
- ret = atif_ioctl(cmd, (void *)arg);
- rtnl_unlock();
- return ret;
- }
- /* Physical layer ioctl calls */
- case SIOCSIFLINK:
- case SIOCGIFHWADDR:
- case SIOCSIFHWADDR:
- case SIOCGIFFLAGS:
- case SIOCSIFFLAGS:
- case SIOCGIFMTU:
- case SIOCGIFCONF:
- case SIOCADDMULTI:
- case SIOCDELMULTI:
- case SIOCGIFCOUNT:
- case SIOCGIFINDEX:
- case SIOCGIFNAME:
- return dev_ioctl(cmd,(void *) arg);
- case SIOCSIFMETRIC:
- case SIOCSIFBRDADDR:
- case SIOCGIFNETMASK:
- case SIOCSIFNETMASK:
- case SIOCGIFMEM:
- case SIOCSIFMEM:
- case SIOCGIFDSTADDR:
- case SIOCSIFDSTADDR:
- return -EINVAL;
- default:
- return -EINVAL;
- }
- return put_user(amount, (int *)arg);
- }
- static struct net_proto_family atalk_family_ops =
- {
- PF_APPLETALK,
- atalk_create
- };
- static struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops)=
- {
- family: PF_APPLETALK,
- release: atalk_release,
- bind: atalk_bind,
- connect: atalk_connect,
- socketpair: sock_no_socketpair,
- accept: sock_no_accept,
- getname: atalk_getname,
- poll: datagram_poll,
- ioctl: atalk_ioctl,
- listen: sock_no_listen,
- shutdown: sock_no_shutdown,
- setsockopt: sock_no_setsockopt,
- getsockopt: sock_no_getsockopt,
- sendmsg: atalk_sendmsg,
- recvmsg: atalk_recvmsg,
- mmap: sock_no_mmap,
- sendpage: sock_no_sendpage,
- };
- #include <linux/smp_lock.h>
- SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK);
- static struct notifier_block ddp_notifier=
- {
- ddp_device_event,
- NULL,
- 0
- };
- struct packet_type ltalk_packet_type=
- {
- 0,
- NULL,
- ltalk_rcv,
- NULL,
- NULL
- };
- struct packet_type ppptalk_packet_type=
- {
- 0,
- NULL,
- atalk_rcv,
- NULL,
- NULL
- };
- static char ddp_snap_id[] = {0x08, 0x00, 0x07, 0x80, 0x9B};
- /* Export symbols for use by drivers when AppleTalk is a module */
- EXPORT_SYMBOL(aarp_send_ddp);
- EXPORT_SYMBOL(atrtr_get_dev);
- EXPORT_SYMBOL(atalk_find_dev_addr);
- /* Called by proto.c on kernel start up */
- static int __init atalk_init(void)
- {
- (void) sock_register(&atalk_family_ops);
- ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
- if (!ddp_dl)
- printk(KERN_CRIT "Unable to register DDP with SNAP.n");
- ltalk_packet_type.type = htons(ETH_P_LOCALTALK);
- dev_add_pack(<alk_packet_type);
- ppptalk_packet_type.type = htons(ETH_P_PPPTALK);
- dev_add_pack(&ppptalk_packet_type);
- register_netdevice_notifier(&ddp_notifier);
- aarp_proto_init();
- proc_net_create("appletalk", 0, atalk_get_info);
- proc_net_create("atalk_route", 0, atalk_rt_get_info);
- proc_net_create("atalk_iface", 0, atalk_if_get_info);
- #ifdef CONFIG_PROC_FS
- aarp_register_proc_fs();
- #endif /* CONFIG_PROC_FS */
- #ifdef CONFIG_SYSCTL
- atalk_register_sysctl();
- #endif /* CONFIG_SYSCTL */
- printk(KERN_INFO "NET4: AppleTalk 0.18a for Linux NET4.0n");
- return 0;
- }
- module_init(atalk_init);
- #ifdef MODULE
- /*
- * Note on MOD_{INC,DEC}_USE_COUNT:
- *
- * Use counts are incremented/decremented when
- * sockets are created/deleted.
- *
- * AppleTalk interfaces are not incremented until atalkd is run
- * and are only decremented when they are downed.
- *
- * Ergo, before the AppleTalk module can be removed, all AppleTalk
- * sockets be closed from user space.
- */
- static void __exit atalk_exit(void)
- {
- #ifdef CONFIG_SYSCTL
- atalk_unregister_sysctl();
- #endif /* CONFIG_SYSCTL */
- proc_net_remove("appletalk");
- proc_net_remove("atalk_route");
- proc_net_remove("atalk_iface");
- #ifdef CONFIG_PROC_FS
- aarp_unregister_proc_fs();
- #endif /* CONFIG_PROC_FS */
- aarp_cleanup_module(); /* General aarp clean-up. */
- unregister_netdevice_notifier(&ddp_notifier);
- dev_remove_pack(<alk_packet_type);
- dev_remove_pack(&ppptalk_packet_type);
- unregister_snap_client(ddp_snap_id);
- sock_unregister(PF_APPLETALK);
- }
- module_exit(atalk_exit);
- #endif /* MODULE */
- #endif /* CONFIG_ATALK || CONFIG_ATALK_MODULE */