/* * DDP: An implementation of the AppleTalk DDP protocol for * Ethernet 'ELAP'. * * Alan Cox * * With more than a little assistance from * * Wesley Craig * * 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 #if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE) #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* For TIOCOUTQ/INQ */ #include #include #include #include #include #include #include #include #include #include #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; #define min(a,b) (((a)<(b))?(a):(b)) /**************************************************************************\ * * * 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 uid\n"); 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 %d\n", 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 */ 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 address\n"); 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 Status\n"); spin_lock_bh(&atalk_iface_lock); for (iface = atalk_iface_list; iface; iface = iface->next) { len += sprintf(buffer+len,"%-16s %04X:%02X %04X-%04X %d\n", 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 Dev\n"); struct atalk_route *rt; if (atrtr_default.dev) { rt = &atrtr_default; len += sprintf(buffer + len,"Default %04X:%02X %-4d %s\n", 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 %s\n", 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(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 iface\n"); 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(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 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 2.2\n"); #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 %s\n", sk, size, dev->name); size += dev->hard_header_len; skb = sock_alloc_send_skb(sk, size, 0, (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 */ return atif_ioctl(cmd, (void *)arg); /* 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, }; #include 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 NET4.0\n"); 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 untill 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 */