diff options
Diffstat (limited to 'net/appletalk')
| -rw-r--r-- | net/appletalk/Makefile | 10 | ||||
| -rw-r--r-- | net/appletalk/aarp.c | 1049 | ||||
| -rw-r--r-- | net/appletalk/atalk_proc.c | 242 | ||||
| -rw-r--r-- | net/appletalk/ddp.c | 2040 | ||||
| -rw-r--r-- | net/appletalk/dev.c | 46 | ||||
| -rw-r--r-- | net/appletalk/sysctl_net_atalk.c | 59 |
6 files changed, 3446 insertions, 0 deletions
diff --git a/net/appletalk/Makefile b/net/appletalk/Makefile new file mode 100644 index 000000000..33164d972 --- /dev/null +++ b/net/appletalk/Makefile @@ -0,0 +1,10 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Makefile for the Linux AppleTalk layer. +# + +obj-$(CONFIG_ATALK) += appletalk.o + +appletalk-y := aarp.o ddp.o dev.o +appletalk-$(CONFIG_PROC_FS) += atalk_proc.o +appletalk-$(CONFIG_SYSCTL) += sysctl_net_atalk.o diff --git a/net/appletalk/aarp.c b/net/appletalk/aarp.c new file mode 100644 index 000000000..45f584171 --- /dev/null +++ b/net/appletalk/aarp.c @@ -0,0 +1,1049 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * AARP: An implementation of the AppleTalk AARP protocol for + * Ethernet 'ELAP'. + * + * Alan Cox <Alan.Cox@linux.org> + * + * This doesn't fit cleanly with the IP arp. Potentially we can use + * the generic neighbour discovery code to clean this up. + * + * FIXME: + * We ought to handle the retransmits with a single list and a + * separate fast timer for when it is needed. + * Use neighbour discovery code. + * Token Ring Support. + * + * References: + * Inside AppleTalk (2nd Ed). + * Fixes: + * Jaume Grau - flush caches on AARP_PROBE + * Rob Newberry - Added proxy AARP and AARP proc fs, + * moved probing from DDP module. + * Arnaldo C. Melo - don't mangle rx packets + */ + +#include <linux/if_arp.h> +#include <linux/slab.h> +#include <net/sock.h> +#include <net/datalink.h> +#include <net/psnap.h> +#include <linux/atalk.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/export.h> +#include <linux/etherdevice.h> + +int sysctl_aarp_expiry_time = AARP_EXPIRY_TIME; +int sysctl_aarp_tick_time = AARP_TICK_TIME; +int sysctl_aarp_retransmit_limit = AARP_RETRANSMIT_LIMIT; +int sysctl_aarp_resolve_time = AARP_RESOLVE_TIME; + +/* Lists of aarp entries */ +/** + * struct aarp_entry - AARP entry + * @last_sent - Last time we xmitted the aarp request + * @packet_queue - Queue of frames wait for resolution + * @status - Used for proxy AARP + * expires_at - Entry expiry time + * target_addr - DDP Address + * dev - Device to use + * hwaddr - Physical i/f address of target/router + * xmit_count - When this hits 10 we give up + * next - Next entry in chain + */ +struct aarp_entry { + /* These first two are only used for unresolved entries */ + unsigned long last_sent; + struct sk_buff_head packet_queue; + int status; + unsigned long expires_at; + struct atalk_addr target_addr; + struct net_device *dev; + char hwaddr[ETH_ALEN]; + unsigned short xmit_count; + struct aarp_entry *next; +}; + +/* Hashed list of resolved, unresolved and proxy entries */ +static struct aarp_entry *resolved[AARP_HASH_SIZE]; +static struct aarp_entry *unresolved[AARP_HASH_SIZE]; +static struct aarp_entry *proxies[AARP_HASH_SIZE]; +static int unresolved_count; + +/* One lock protects it all. */ +static DEFINE_RWLOCK(aarp_lock); + +/* Used to walk the list and purge/kick entries. */ +static struct timer_list aarp_timer; + +/* + * Delete an aarp queue + * + * Must run under aarp_lock. + */ +static void __aarp_expire(struct aarp_entry *a) +{ + skb_queue_purge(&a->packet_queue); + kfree(a); +} + +/* + * Send an aarp queue entry request + * + * Must run under aarp_lock. + */ +static void __aarp_send_query(struct aarp_entry *a) +{ + static unsigned char aarp_eth_multicast[ETH_ALEN] = + { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF }; + struct net_device *dev = a->dev; + struct elapaarp *eah; + int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length; + struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC); + struct atalk_addr *sat = atalk_find_dev_addr(dev); + + if (!skb) + return; + + if (!sat) { + kfree_skb(skb); + return; + } + + /* Set up the buffer */ + skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length); + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + skb_put(skb, sizeof(*eah)); + skb->protocol = htons(ETH_P_ATALK); + skb->dev = dev; + eah = aarp_hdr(skb); + + /* Set up the ARP */ + eah->hw_type = htons(AARP_HW_TYPE_ETHERNET); + eah->pa_type = htons(ETH_P_ATALK); + eah->hw_len = ETH_ALEN; + eah->pa_len = AARP_PA_ALEN; + eah->function = htons(AARP_REQUEST); + + ether_addr_copy(eah->hw_src, dev->dev_addr); + + eah->pa_src_zero = 0; + eah->pa_src_net = sat->s_net; + eah->pa_src_node = sat->s_node; + + eth_zero_addr(eah->hw_dst); + + eah->pa_dst_zero = 0; + eah->pa_dst_net = a->target_addr.s_net; + eah->pa_dst_node = a->target_addr.s_node; + + /* Send it */ + aarp_dl->request(aarp_dl, skb, aarp_eth_multicast); + /* Update the sending count */ + a->xmit_count++; + a->last_sent = jiffies; +} + +/* This runs under aarp_lock and in softint context, so only atomic memory + * allocations can be used. */ +static void aarp_send_reply(struct net_device *dev, struct atalk_addr *us, + struct atalk_addr *them, unsigned char *sha) +{ + struct elapaarp *eah; + int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length; + struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC); + + if (!skb) + return; + + /* Set up the buffer */ + skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length); + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + skb_put(skb, sizeof(*eah)); + skb->protocol = htons(ETH_P_ATALK); + skb->dev = dev; + eah = aarp_hdr(skb); + + /* Set up the ARP */ + eah->hw_type = htons(AARP_HW_TYPE_ETHERNET); + eah->pa_type = htons(ETH_P_ATALK); + eah->hw_len = ETH_ALEN; + eah->pa_len = AARP_PA_ALEN; + eah->function = htons(AARP_REPLY); + + ether_addr_copy(eah->hw_src, dev->dev_addr); + + eah->pa_src_zero = 0; + eah->pa_src_net = us->s_net; + eah->pa_src_node = us->s_node; + + if (!sha) + eth_zero_addr(eah->hw_dst); + else + ether_addr_copy(eah->hw_dst, sha); + + eah->pa_dst_zero = 0; + eah->pa_dst_net = them->s_net; + eah->pa_dst_node = them->s_node; + + /* Send it */ + aarp_dl->request(aarp_dl, skb, sha); +} + +/* + * Send probe frames. Called from aarp_probe_network and + * aarp_proxy_probe_network. + */ + +static void aarp_send_probe(struct net_device *dev, struct atalk_addr *us) +{ + struct elapaarp *eah; + int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length; + struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC); + static unsigned char aarp_eth_multicast[ETH_ALEN] = + { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF }; + + if (!skb) + return; + + /* Set up the buffer */ + skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length); + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + skb_put(skb, sizeof(*eah)); + skb->protocol = htons(ETH_P_ATALK); + skb->dev = dev; + eah = aarp_hdr(skb); + + /* Set up the ARP */ + eah->hw_type = htons(AARP_HW_TYPE_ETHERNET); + eah->pa_type = htons(ETH_P_ATALK); + eah->hw_len = ETH_ALEN; + eah->pa_len = AARP_PA_ALEN; + eah->function = htons(AARP_PROBE); + + ether_addr_copy(eah->hw_src, dev->dev_addr); + + eah->pa_src_zero = 0; + eah->pa_src_net = us->s_net; + eah->pa_src_node = us->s_node; + + eth_zero_addr(eah->hw_dst); + + eah->pa_dst_zero = 0; + eah->pa_dst_net = us->s_net; + eah->pa_dst_node = us->s_node; + + /* Send it */ + aarp_dl->request(aarp_dl, skb, aarp_eth_multicast); +} + +/* + * Handle an aarp timer expire + * + * Must run under the aarp_lock. + */ + +static void __aarp_expire_timer(struct aarp_entry **n) +{ + struct aarp_entry *t; + + while (*n) + /* Expired ? */ + if (time_after(jiffies, (*n)->expires_at)) { + t = *n; + *n = (*n)->next; + __aarp_expire(t); + } else + n = &((*n)->next); +} + +/* + * Kick all pending requests 5 times a second. + * + * Must run under the aarp_lock. + */ +static void __aarp_kick(struct aarp_entry **n) +{ + struct aarp_entry *t; + + while (*n) + /* Expired: if this will be the 11th tx, we delete instead. */ + if ((*n)->xmit_count >= sysctl_aarp_retransmit_limit) { + t = *n; + *n = (*n)->next; + __aarp_expire(t); + } else { + __aarp_send_query(*n); + n = &((*n)->next); + } +} + +/* + * A device has gone down. Take all entries referring to the device + * and remove them. + * + * Must run under the aarp_lock. + */ +static void __aarp_expire_device(struct aarp_entry **n, struct net_device *dev) +{ + struct aarp_entry *t; + + while (*n) + if ((*n)->dev == dev) { + t = *n; + *n = (*n)->next; + __aarp_expire(t); + } else + n = &((*n)->next); +} + +/* Handle the timer event */ +static void aarp_expire_timeout(struct timer_list *unused) +{ + int ct; + + write_lock_bh(&aarp_lock); + + for (ct = 0; ct < AARP_HASH_SIZE; ct++) { + __aarp_expire_timer(&resolved[ct]); + __aarp_kick(&unresolved[ct]); + __aarp_expire_timer(&unresolved[ct]); + __aarp_expire_timer(&proxies[ct]); + } + + write_unlock_bh(&aarp_lock); + mod_timer(&aarp_timer, jiffies + + (unresolved_count ? sysctl_aarp_tick_time : + sysctl_aarp_expiry_time)); +} + +/* Network device notifier chain handler. */ +static int aarp_device_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + int ct; + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + + if (event == NETDEV_DOWN) { + write_lock_bh(&aarp_lock); + + for (ct = 0; ct < AARP_HASH_SIZE; ct++) { + __aarp_expire_device(&resolved[ct], dev); + __aarp_expire_device(&unresolved[ct], dev); + __aarp_expire_device(&proxies[ct], dev); + } + + write_unlock_bh(&aarp_lock); + } + return NOTIFY_DONE; +} + +/* Expire all entries in a hash chain */ +static void __aarp_expire_all(struct aarp_entry **n) +{ + struct aarp_entry *t; + + while (*n) { + t = *n; + *n = (*n)->next; + __aarp_expire(t); + } +} + +/* Cleanup all hash chains -- module unloading */ +static void aarp_purge(void) +{ + int ct; + + write_lock_bh(&aarp_lock); + for (ct = 0; ct < AARP_HASH_SIZE; ct++) { + __aarp_expire_all(&resolved[ct]); + __aarp_expire_all(&unresolved[ct]); + __aarp_expire_all(&proxies[ct]); + } + write_unlock_bh(&aarp_lock); +} + +/* + * Create a new aarp entry. This must use GFP_ATOMIC because it + * runs while holding spinlocks. + */ +static struct aarp_entry *aarp_alloc(void) +{ + struct aarp_entry *a = kmalloc(sizeof(*a), GFP_ATOMIC); + + if (a) + skb_queue_head_init(&a->packet_queue); + return a; +} + +/* + * Find an entry. We might return an expired but not yet purged entry. We + * don't care as it will do no harm. + * + * This must run under the aarp_lock. + */ +static struct aarp_entry *__aarp_find_entry(struct aarp_entry *list, + struct net_device *dev, + struct atalk_addr *sat) +{ + while (list) { + if (list->target_addr.s_net == sat->s_net && + list->target_addr.s_node == sat->s_node && + list->dev == dev) + break; + list = list->next; + } + + return list; +} + +/* Called from the DDP code, and thus must be exported. */ +void aarp_proxy_remove(struct net_device *dev, struct atalk_addr *sa) +{ + int hash = sa->s_node % (AARP_HASH_SIZE - 1); + struct aarp_entry *a; + + write_lock_bh(&aarp_lock); + + a = __aarp_find_entry(proxies[hash], dev, sa); + if (a) + a->expires_at = jiffies - 1; + + write_unlock_bh(&aarp_lock); +} + +/* This must run under aarp_lock. */ +static struct atalk_addr *__aarp_proxy_find(struct net_device *dev, + struct atalk_addr *sa) +{ + int hash = sa->s_node % (AARP_HASH_SIZE - 1); + struct aarp_entry *a = __aarp_find_entry(proxies[hash], dev, sa); + + return a ? sa : NULL; +} + +/* + * Probe a Phase 1 device or a device that requires its Net:Node to + * be set via an ioctl. + */ +static void aarp_send_probe_phase1(struct atalk_iface *iface) +{ + struct ifreq atreq; + struct sockaddr_at *sa = (struct sockaddr_at *)&atreq.ifr_addr; + const struct net_device_ops *ops = iface->dev->netdev_ops; + + sa->sat_addr.s_node = iface->address.s_node; + sa->sat_addr.s_net = ntohs(iface->address.s_net); + + /* We pass the Net:Node to the drivers/cards by a Device ioctl. */ + if (!(ops->ndo_do_ioctl(iface->dev, &atreq, SIOCSIFADDR))) { + ops->ndo_do_ioctl(iface->dev, &atreq, SIOCGIFADDR); + if (iface->address.s_net != htons(sa->sat_addr.s_net) || + iface->address.s_node != sa->sat_addr.s_node) + iface->status |= ATIF_PROBE_FAIL; + + iface->address.s_net = htons(sa->sat_addr.s_net); + iface->address.s_node = sa->sat_addr.s_node; + } +} + + +void aarp_probe_network(struct atalk_iface *atif) +{ + if (atif->dev->type == ARPHRD_LOCALTLK || + atif->dev->type == ARPHRD_PPP) + aarp_send_probe_phase1(atif); + else { + unsigned int count; + + for (count = 0; count < AARP_RETRANSMIT_LIMIT; count++) { + aarp_send_probe(atif->dev, &atif->address); + + /* Defer 1/10th */ + msleep(100); + + if (atif->status & ATIF_PROBE_FAIL) + break; + } + } +} + +int aarp_proxy_probe_network(struct atalk_iface *atif, struct atalk_addr *sa) +{ + int hash, retval = -EPROTONOSUPPORT; + struct aarp_entry *entry; + unsigned int count; + + /* + * we don't currently support LocalTalk or PPP for proxy AARP; + * if someone wants to try and add it, have fun + */ + if (atif->dev->type == ARPHRD_LOCALTLK || + atif->dev->type == ARPHRD_PPP) + goto out; + + /* + * create a new AARP entry with the flags set to be published -- + * we need this one to hang around even if it's in use + */ + entry = aarp_alloc(); + retval = -ENOMEM; + if (!entry) + goto out; + + entry->expires_at = -1; + entry->status = ATIF_PROBE; + entry->target_addr.s_node = sa->s_node; + entry->target_addr.s_net = sa->s_net; + entry->dev = atif->dev; + + write_lock_bh(&aarp_lock); + + hash = sa->s_node % (AARP_HASH_SIZE - 1); + entry->next = proxies[hash]; + proxies[hash] = entry; + + for (count = 0; count < AARP_RETRANSMIT_LIMIT; count++) { + aarp_send_probe(atif->dev, sa); + + /* Defer 1/10th */ + write_unlock_bh(&aarp_lock); + msleep(100); + write_lock_bh(&aarp_lock); + + if (entry->status & ATIF_PROBE_FAIL) + break; + } + + if (entry->status & ATIF_PROBE_FAIL) { + entry->expires_at = jiffies - 1; /* free the entry */ + retval = -EADDRINUSE; /* return network full */ + } else { /* clear the probing flag */ + entry->status &= ~ATIF_PROBE; + retval = 1; + } + + write_unlock_bh(&aarp_lock); +out: + return retval; +} + +/* Send a DDP frame */ +int aarp_send_ddp(struct net_device *dev, struct sk_buff *skb, + struct atalk_addr *sa, void *hwaddr) +{ + static char ddp_eth_multicast[ETH_ALEN] = + { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF }; + int hash; + struct aarp_entry *a; + + skb_reset_network_header(skb); + + /* Check for LocalTalk first */ + if (dev->type == ARPHRD_LOCALTLK) { + struct atalk_addr *at = atalk_find_dev_addr(dev); + struct ddpehdr *ddp = (struct ddpehdr *)skb->data; + int ft = 2; + + /* + * Compressible ? + * + * IFF: src_net == dest_net == device_net + * (zero matches anything) + */ + + if ((!ddp->deh_snet || at->s_net == ddp->deh_snet) && + (!ddp->deh_dnet || at->s_net == ddp->deh_dnet)) { + skb_pull(skb, sizeof(*ddp) - 4); + + /* + * The upper two remaining bytes are the port + * numbers we just happen to need. Now put the + * length in the lower two. + */ + *((__be16 *)skb->data) = htons(skb->len); + ft = 1; + } + /* + * Nice and easy. No AARP type protocols occur here so we can + * just shovel it out with a 3 byte LLAP header + */ + + skb_push(skb, 3); + skb->data[0] = sa->s_node; + skb->data[1] = at->s_node; + skb->data[2] = ft; + skb->dev = dev; + goto sendit; + } + + /* On a PPP link we neither compress nor aarp. */ + if (dev->type == ARPHRD_PPP) { + skb->protocol = htons(ETH_P_PPPTALK); + skb->dev = dev; + goto sendit; + } + + /* Non ELAP we cannot do. */ + if (dev->type != ARPHRD_ETHER) + goto free_it; + + skb->dev = dev; + skb->protocol = htons(ETH_P_ATALK); + hash = sa->s_node % (AARP_HASH_SIZE - 1); + + /* Do we have a resolved entry? */ + if (sa->s_node == ATADDR_BCAST) { + /* Send it */ + ddp_dl->request(ddp_dl, skb, ddp_eth_multicast); + goto sent; + } + + write_lock_bh(&aarp_lock); + a = __aarp_find_entry(resolved[hash], dev, sa); + + if (a) { /* Return 1 and fill in the address */ + a->expires_at = jiffies + (sysctl_aarp_expiry_time * 10); + ddp_dl->request(ddp_dl, skb, a->hwaddr); + write_unlock_bh(&aarp_lock); + goto sent; + } + + /* Do we have an unresolved entry: This is the less common path */ + a = __aarp_find_entry(unresolved[hash], dev, sa); + if (a) { /* Queue onto the unresolved queue */ + skb_queue_tail(&a->packet_queue, skb); + goto out_unlock; + } + + /* Allocate a new entry */ + a = aarp_alloc(); + if (!a) { + /* Whoops slipped... good job it's an unreliable protocol 8) */ + write_unlock_bh(&aarp_lock); + goto free_it; + } + + /* Set up the queue */ + skb_queue_tail(&a->packet_queue, skb); + a->expires_at = jiffies + sysctl_aarp_resolve_time; + a->dev = dev; + a->next = unresolved[hash]; + a->target_addr = *sa; + a->xmit_count = 0; + unresolved[hash] = a; + unresolved_count++; + + /* Send an initial request for the address */ + __aarp_send_query(a); + + /* + * Switch to fast timer if needed (That is if this is the first + * unresolved entry to get added) + */ + + if (unresolved_count == 1) + mod_timer(&aarp_timer, jiffies + sysctl_aarp_tick_time); + + /* Now finally, it is safe to drop the lock. */ +out_unlock: + write_unlock_bh(&aarp_lock); + + /* Tell the ddp layer we have taken over for this frame. */ + goto sent; + +sendit: + if (skb->sk) + skb->priority = skb->sk->sk_priority; + if (dev_queue_xmit(skb)) + goto drop; +sent: + return NET_XMIT_SUCCESS; +free_it: + kfree_skb(skb); +drop: + return NET_XMIT_DROP; +} +EXPORT_SYMBOL(aarp_send_ddp); + +/* + * An entry in the aarp unresolved queue has become resolved. Send + * all the frames queued under it. + * + * Must run under aarp_lock. + */ +static void __aarp_resolved(struct aarp_entry **list, struct aarp_entry *a, + int hash) +{ + struct sk_buff *skb; + + while (*list) + if (*list == a) { + unresolved_count--; + *list = a->next; + + /* Move into the resolved list */ + a->next = resolved[hash]; + resolved[hash] = a; + + /* Kick frames off */ + while ((skb = skb_dequeue(&a->packet_queue)) != NULL) { + a->expires_at = jiffies + + sysctl_aarp_expiry_time * 10; + ddp_dl->request(ddp_dl, skb, a->hwaddr); + } + } else + list = &((*list)->next); +} + +/* + * This is called by the SNAP driver whenever we see an AARP SNAP + * frame. We currently only support Ethernet. + */ +static int aarp_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct elapaarp *ea = aarp_hdr(skb); + int hash, ret = 0; + __u16 function; + struct aarp_entry *a; + struct atalk_addr sa, *ma, da; + struct atalk_iface *ifa; + + if (!net_eq(dev_net(dev), &init_net)) + goto out0; + + /* We only do Ethernet SNAP AARP. */ + if (dev->type != ARPHRD_ETHER) + goto out0; + + /* Frame size ok? */ + if (!skb_pull(skb, sizeof(*ea))) + goto out0; + + function = ntohs(ea->function); + + /* Sanity check fields. */ + if (function < AARP_REQUEST || function > AARP_PROBE || + ea->hw_len != ETH_ALEN || ea->pa_len != AARP_PA_ALEN || + ea->pa_src_zero || ea->pa_dst_zero) + goto out0; + + /* Looks good. */ + hash = ea->pa_src_node % (AARP_HASH_SIZE - 1); + + /* Build an address. */ + sa.s_node = ea->pa_src_node; + sa.s_net = ea->pa_src_net; + + /* Process the packet. Check for replies of me. */ + ifa = atalk_find_dev(dev); + if (!ifa) + goto out1; + + if (ifa->status & ATIF_PROBE && + ifa->address.s_node == ea->pa_dst_node && + ifa->address.s_net == ea->pa_dst_net) { + ifa->status |= ATIF_PROBE_FAIL; /* Fail the probe (in use) */ + goto out1; + } + + /* Check for replies of proxy AARP entries */ + da.s_node = ea->pa_dst_node; + da.s_net = ea->pa_dst_net; + + write_lock_bh(&aarp_lock); + a = __aarp_find_entry(proxies[hash], dev, &da); + + if (a && a->status & ATIF_PROBE) { + a->status |= ATIF_PROBE_FAIL; + /* + * we do not respond to probe or request packets for + * this address while we are probing this address + */ + goto unlock; + } + + switch (function) { + case AARP_REPLY: + if (!unresolved_count) /* Speed up */ + break; + + /* Find the entry. */ + a = __aarp_find_entry(unresolved[hash], dev, &sa); + if (!a || dev != a->dev) + break; + + /* We can fill one in - this is good. */ + ether_addr_copy(a->hwaddr, ea->hw_src); + __aarp_resolved(&unresolved[hash], a, hash); + if (!unresolved_count) + mod_timer(&aarp_timer, + jiffies + sysctl_aarp_expiry_time); + break; + + case AARP_REQUEST: + case AARP_PROBE: + + /* + * If it is my address set ma to my address and reply. + * We can treat probe and request the same. Probe + * simply means we shouldn't cache the querying host, + * as in a probe they are proposing an address not + * using one. + * + * Support for proxy-AARP added. We check if the + * address is one of our proxies before we toss the + * packet out. + */ + + sa.s_node = ea->pa_dst_node; + sa.s_net = ea->pa_dst_net; + + /* See if we have a matching proxy. */ + ma = __aarp_proxy_find(dev, &sa); + if (!ma) + ma = &ifa->address; + else { /* We need to make a copy of the entry. */ + da.s_node = sa.s_node; + da.s_net = sa.s_net; + ma = &da; + } + + if (function == AARP_PROBE) { + /* + * A probe implies someone trying to get an + * address. So as a precaution flush any + * entries we have for this address. + */ + a = __aarp_find_entry(resolved[sa.s_node % + (AARP_HASH_SIZE - 1)], + skb->dev, &sa); + + /* + * Make it expire next tick - that avoids us + * getting into a probe/flush/learn/probe/ + * flush/learn cycle during probing of a slow + * to respond host addr. + */ + if (a) { + a->expires_at = jiffies - 1; + mod_timer(&aarp_timer, jiffies + + sysctl_aarp_tick_time); + } + } + + if (sa.s_node != ma->s_node) + break; + + if (sa.s_net && ma->s_net && sa.s_net != ma->s_net) + break; + + sa.s_node = ea->pa_src_node; + sa.s_net = ea->pa_src_net; + + /* aarp_my_address has found the address to use for us. + */ + aarp_send_reply(dev, ma, &sa, ea->hw_src); + break; + } + +unlock: + write_unlock_bh(&aarp_lock); +out1: + ret = 1; +out0: + kfree_skb(skb); + return ret; +} + +static struct notifier_block aarp_notifier = { + .notifier_call = aarp_device_event, +}; + +static unsigned char aarp_snap_id[] = { 0x00, 0x00, 0x00, 0x80, 0xF3 }; + +int __init aarp_proto_init(void) +{ + int rc; + + aarp_dl = register_snap_client(aarp_snap_id, aarp_rcv); + if (!aarp_dl) { + printk(KERN_CRIT "Unable to register AARP with SNAP.\n"); + return -ENOMEM; + } + timer_setup(&aarp_timer, aarp_expire_timeout, 0); + aarp_timer.expires = jiffies + sysctl_aarp_expiry_time; + add_timer(&aarp_timer); + rc = register_netdevice_notifier(&aarp_notifier); + if (rc) { + del_timer_sync(&aarp_timer); + unregister_snap_client(aarp_dl); + } + return rc; +} + +/* Remove the AARP entries associated with a device. */ +void aarp_device_down(struct net_device *dev) +{ + int ct; + + write_lock_bh(&aarp_lock); + + for (ct = 0; ct < AARP_HASH_SIZE; ct++) { + __aarp_expire_device(&resolved[ct], dev); + __aarp_expire_device(&unresolved[ct], dev); + __aarp_expire_device(&proxies[ct], dev); + } + + write_unlock_bh(&aarp_lock); +} + +#ifdef CONFIG_PROC_FS +/* + * Get the aarp entry that is in the chain described + * by the iterator. + * If pos is set then skip till that index. + * pos = 1 is the first entry + */ +static struct aarp_entry *iter_next(struct aarp_iter_state *iter, loff_t *pos) +{ + int ct = iter->bucket; + struct aarp_entry **table = iter->table; + loff_t off = 0; + struct aarp_entry *entry; + + rescan: + while (ct < AARP_HASH_SIZE) { + for (entry = table[ct]; entry; entry = entry->next) { + if (!pos || ++off == *pos) { + iter->table = table; + iter->bucket = ct; + return entry; + } + } + ++ct; + } + + if (table == resolved) { + ct = 0; + table = unresolved; + goto rescan; + } + if (table == unresolved) { + ct = 0; + table = proxies; + goto rescan; + } + return NULL; +} + +static void *aarp_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(aarp_lock) +{ + struct aarp_iter_state *iter = seq->private; + + read_lock_bh(&aarp_lock); + iter->table = resolved; + iter->bucket = 0; + + return *pos ? iter_next(iter, pos) : SEQ_START_TOKEN; +} + +static void *aarp_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct aarp_entry *entry = v; + struct aarp_iter_state *iter = seq->private; + + ++*pos; + + /* first line after header */ + if (v == SEQ_START_TOKEN) + entry = iter_next(iter, NULL); + + /* next entry in current bucket */ + else if (entry->next) + entry = entry->next; + + /* next bucket or table */ + else { + ++iter->bucket; + entry = iter_next(iter, NULL); + } + return entry; +} + +static void aarp_seq_stop(struct seq_file *seq, void *v) + __releases(aarp_lock) +{ + read_unlock_bh(&aarp_lock); +} + +static const char *dt2str(unsigned long ticks) +{ + static char buf[32]; + + sprintf(buf, "%ld.%02ld", ticks / HZ, ((ticks % HZ) * 100) / HZ); + + return buf; +} + +static int aarp_seq_show(struct seq_file *seq, void *v) +{ + struct aarp_iter_state *iter = seq->private; + struct aarp_entry *entry = v; + unsigned long now = jiffies; + + if (v == SEQ_START_TOKEN) + seq_puts(seq, + "Address Interface Hardware Address" + " Expires LastSend Retry Status\n"); + else { + seq_printf(seq, "%04X:%02X %-12s", + ntohs(entry->target_addr.s_net), + (unsigned int) entry->target_addr.s_node, + entry->dev ? entry->dev->name : "????"); + seq_printf(seq, "%pM", entry->hwaddr); + seq_printf(seq, " %8s", + dt2str((long)entry->expires_at - (long)now)); + if (iter->table == unresolved) + seq_printf(seq, " %8s %6hu", + dt2str(now - entry->last_sent), + entry->xmit_count); + else + seq_puts(seq, " "); + seq_printf(seq, " %s\n", + (iter->table == resolved) ? "resolved" + : (iter->table == unresolved) ? "unresolved" + : (iter->table == proxies) ? "proxies" + : "unknown"); + } + return 0; +} + +const struct seq_operations aarp_seq_ops = { + .start = aarp_seq_start, + .next = aarp_seq_next, + .stop = aarp_seq_stop, + .show = aarp_seq_show, +}; +#endif + +/* General module cleanup. Called from cleanup_module() in ddp.c. */ +void aarp_cleanup_module(void) +{ + del_timer_sync(&aarp_timer); + unregister_netdevice_notifier(&aarp_notifier); + unregister_snap_client(aarp_dl); + aarp_purge(); +} diff --git a/net/appletalk/atalk_proc.c b/net/appletalk/atalk_proc.c new file mode 100644 index 000000000..9c1241292 --- /dev/null +++ b/net/appletalk/atalk_proc.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * atalk_proc.c - proc support for Appletalk + * + * Copyright(c) Arnaldo Carvalho de Melo <acme@conectiva.com.br> + */ + +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <net/net_namespace.h> +#include <net/sock.h> +#include <linux/atalk.h> +#include <linux/export.h> + + +static __inline__ struct atalk_iface *atalk_get_interface_idx(loff_t pos) +{ + struct atalk_iface *i; + + for (i = atalk_interfaces; pos && i; i = i->next) + --pos; + + return i; +} + +static void *atalk_seq_interface_start(struct seq_file *seq, loff_t *pos) + __acquires(atalk_interfaces_lock) +{ + loff_t l = *pos; + + read_lock_bh(&atalk_interfaces_lock); + return l ? atalk_get_interface_idx(--l) : SEQ_START_TOKEN; +} + +static void *atalk_seq_interface_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct atalk_iface *i; + + ++*pos; + if (v == SEQ_START_TOKEN) { + i = NULL; + if (atalk_interfaces) + i = atalk_interfaces; + goto out; + } + i = v; + i = i->next; +out: + return i; +} + +static void atalk_seq_interface_stop(struct seq_file *seq, void *v) + __releases(atalk_interfaces_lock) +{ + read_unlock_bh(&atalk_interfaces_lock); +} + +static int atalk_seq_interface_show(struct seq_file *seq, void *v) +{ + struct atalk_iface *iface; + + if (v == SEQ_START_TOKEN) { + seq_puts(seq, "Interface Address Networks " + "Status\n"); + goto out; + } + + iface = v; + seq_printf(seq, "%-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); +out: + return 0; +} + +static __inline__ struct atalk_route *atalk_get_route_idx(loff_t pos) +{ + struct atalk_route *r; + + for (r = atalk_routes; pos && r; r = r->next) + --pos; + + return r; +} + +static void *atalk_seq_route_start(struct seq_file *seq, loff_t *pos) + __acquires(atalk_routes_lock) +{ + loff_t l = *pos; + + read_lock_bh(&atalk_routes_lock); + return l ? atalk_get_route_idx(--l) : SEQ_START_TOKEN; +} + +static void *atalk_seq_route_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct atalk_route *r; + + ++*pos; + if (v == SEQ_START_TOKEN) { + r = NULL; + if (atalk_routes) + r = atalk_routes; + goto out; + } + r = v; + r = r->next; +out: + return r; +} + +static void atalk_seq_route_stop(struct seq_file *seq, void *v) + __releases(atalk_routes_lock) +{ + read_unlock_bh(&atalk_routes_lock); +} + +static int atalk_seq_route_show(struct seq_file *seq, void *v) +{ + struct atalk_route *rt; + + if (v == SEQ_START_TOKEN) { + seq_puts(seq, "Target Router Flags Dev\n"); + goto out; + } + + if (atrtr_default.dev) { + rt = &atrtr_default; + seq_printf(seq, "Default %04X:%02X %-4d %s\n", + ntohs(rt->gateway.s_net), rt->gateway.s_node, + rt->flags, rt->dev->name); + } + + rt = v; + seq_printf(seq, "%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); +out: + return 0; +} + +static void *atalk_seq_socket_start(struct seq_file *seq, loff_t *pos) + __acquires(atalk_sockets_lock) +{ + read_lock_bh(&atalk_sockets_lock); + return seq_hlist_start_head(&atalk_sockets, *pos); +} + +static void *atalk_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos) +{ + return seq_hlist_next(v, &atalk_sockets, pos); +} + +static void atalk_seq_socket_stop(struct seq_file *seq, void *v) + __releases(atalk_sockets_lock) +{ + read_unlock_bh(&atalk_sockets_lock); +} + +static int atalk_seq_socket_show(struct seq_file *seq, void *v) +{ + struct sock *s; + struct atalk_sock *at; + + if (v == SEQ_START_TOKEN) { + seq_printf(seq, "Type Local_addr Remote_addr Tx_queue " + "Rx_queue St UID\n"); + goto out; + } + + s = sk_entry(v); + at = at_sk(s); + + seq_printf(seq, "%02X %04X:%02X:%02X %04X:%02X:%02X %08X:%08X " + "%02X %u\n", + s->sk_type, ntohs(at->src_net), at->src_node, at->src_port, + ntohs(at->dest_net), at->dest_node, at->dest_port, + sk_wmem_alloc_get(s), + sk_rmem_alloc_get(s), + s->sk_state, + from_kuid_munged(seq_user_ns(seq), sock_i_uid(s))); +out: + return 0; +} + +static const struct seq_operations atalk_seq_interface_ops = { + .start = atalk_seq_interface_start, + .next = atalk_seq_interface_next, + .stop = atalk_seq_interface_stop, + .show = atalk_seq_interface_show, +}; + +static const struct seq_operations atalk_seq_route_ops = { + .start = atalk_seq_route_start, + .next = atalk_seq_route_next, + .stop = atalk_seq_route_stop, + .show = atalk_seq_route_show, +}; + +static const struct seq_operations atalk_seq_socket_ops = { + .start = atalk_seq_socket_start, + .next = atalk_seq_socket_next, + .stop = atalk_seq_socket_stop, + .show = atalk_seq_socket_show, +}; + +int __init atalk_proc_init(void) +{ + if (!proc_mkdir("atalk", init_net.proc_net)) + return -ENOMEM; + + if (!proc_create_seq("atalk/interface", 0444, init_net.proc_net, + &atalk_seq_interface_ops)) + goto out; + + if (!proc_create_seq("atalk/route", 0444, init_net.proc_net, + &atalk_seq_route_ops)) + goto out; + + if (!proc_create_seq("atalk/socket", 0444, init_net.proc_net, + &atalk_seq_socket_ops)) + goto out; + + if (!proc_create_seq_private("atalk/arp", 0444, init_net.proc_net, + &aarp_seq_ops, + sizeof(struct aarp_iter_state), NULL)) + goto out; + + return 0; + +out: + remove_proc_subtree("atalk", init_net.proc_net); + return -ENOMEM; +} + +void atalk_proc_exit(void) +{ + remove_proc_subtree("atalk", init_net.proc_net); +} diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c new file mode 100644 index 000000000..46adb8cef --- /dev/null +++ b/net/appletalk/ddp.c @@ -0,0 +1,2040 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * DDP: An implementation of the AppleTalk DDP protocol for + * Ethernet 'ELAP'. + * + * Alan Cox <alan@lxorguk.ukuu.org.uk> + * + * With more than a little assistance from + * + * Wesley Craig <netatalk@umich.edu> + * + * Fixes: + * Neil Horman : Added missing device ioctls + * 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) + * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c, + * use seq_file + */ + +#include <linux/capability.h> +#include <linux/module.h> +#include <linux/if_arp.h> +#include <linux/termios.h> /* For TIOCOUTQ/INQ */ +#include <linux/compat.h> +#include <linux/slab.h> +#include <net/datalink.h> +#include <net/psnap.h> +#include <net/sock.h> +#include <net/tcp_states.h> +#include <net/route.h> +#include <net/compat.h> +#include <linux/atalk.h> +#include <linux/highmem.h> + +struct datalink_proto *ddp_dl, *aarp_dl; +static const struct proto_ops atalk_dgram_ops; + +/**************************************************************************\ +* * +* Handlers for the socket list. * +* * +\**************************************************************************/ + +HLIST_HEAD(atalk_sockets); +DEFINE_RWLOCK(atalk_sockets_lock); + +static inline void __atalk_insert_socket(struct sock *sk) +{ + sk_add_node(sk, &atalk_sockets); +} + +static inline void atalk_remove_socket(struct sock *sk) +{ + write_lock_bh(&atalk_sockets_lock); + sk_del_node_init(sk); + write_unlock_bh(&atalk_sockets_lock); +} + +static struct sock *atalk_search_socket(struct sockaddr_at *to, + struct atalk_iface *atif) +{ + struct sock *s; + + read_lock_bh(&atalk_sockets_lock); + sk_for_each(s, &atalk_sockets) { + struct atalk_sock *at = at_sk(s); + + if (to->sat_port != at->src_port) + continue; + + if (to->sat_addr.s_net == ATADDR_ANYNET && + to->sat_addr.s_node == ATADDR_BCAST) + goto found; + + if (to->sat_addr.s_net == at->src_net && + (to->sat_addr.s_node == at->src_node || + to->sat_addr.s_node == ATADDR_BCAST || + to->sat_addr.s_node == ATADDR_ANYNODE)) + goto found; + + /* 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 == at->src_node) { + to->sat_addr.s_node = atif->address.s_node; + goto found; + } + } + s = NULL; +found: + read_unlock_bh(&atalk_sockets_lock); + return s; +} + +/** + * atalk_find_or_insert_socket - Try to find a socket matching ADDR + * @sk: socket to insert in the list if it is not there already + * @sat: address to search for + * + * 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; + struct atalk_sock *at; + + write_lock_bh(&atalk_sockets_lock); + sk_for_each(s, &atalk_sockets) { + at = at_sk(s); + + if (at->src_net == sat->sat_addr.s_net && + at->src_node == sat->sat_addr.s_node && + at->src_port == sat->sat_port) + goto found; + } + s = NULL; + __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ +found: + write_unlock_bh(&atalk_sockets_lock); + return s; +} + +static void atalk_destroy_timer(struct timer_list *t) +{ + struct sock *sk = from_timer(sk, t, sk_timer); + + if (sk_has_allocations(sk)) { + sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; + add_timer(&sk->sk_timer); + } else + sock_put(sk); +} + +static inline void atalk_destroy_socket(struct sock *sk) +{ + atalk_remove_socket(sk); + skb_queue_purge(&sk->sk_receive_queue); + + if (sk_has_allocations(sk)) { + timer_setup(&sk->sk_timer, atalk_destroy_timer, 0); + sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; + add_timer(&sk->sk_timer); + } else + sock_put(sk); +} + +/**************************************************************************\ +* * +* Routing tables for the AppleTalk socket layer. * +* * +\**************************************************************************/ + +/* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ +struct atalk_route *atalk_routes; +DEFINE_RWLOCK(atalk_routes_lock); + +struct atalk_iface *atalk_interfaces; +DEFINE_RWLOCK(atalk_interfaces_lock); + +/* For probing devices or in a routerless network */ +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_interfaces; + struct atalk_iface *tmp; + + write_lock_bh(&atalk_interfaces_lock); + while ((tmp = *iface) != NULL) { + if (tmp->dev == dev) { + *iface = tmp->next; + dev_put(dev); + kfree(tmp); + dev->atalk_ptr = NULL; + } else + iface = &tmp->next; + } + write_unlock_bh(&atalk_interfaces_lock); +} + +static struct atalk_iface *atif_add_device(struct net_device *dev, + struct atalk_addr *sa) +{ + struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); + + if (!iface) + goto out; + + dev_hold(dev); + iface->dev = dev; + dev->atalk_ptr = iface; + iface->address = *sa; + iface->status = 0; + + write_lock_bh(&atalk_interfaces_lock); + iface->next = atalk_interfaces; + atalk_interfaces = iface; + write_unlock_bh(&atalk_interfaces_lock); +out: + 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 atalk_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 atalk_addr *atalk_find_dev_addr(struct net_device *dev) +{ + struct atalk_iface *iface = dev->atalk_ptr; + return iface ? &iface->address : NULL; +} + +static struct atalk_addr *atalk_find_primary(void) +{ + struct atalk_iface *fiface = NULL; + struct atalk_addr *retval; + struct atalk_iface *iface; + + /* + * Return a point-to-point interface only if + * there is no non-ptp interface available. + */ + read_lock_bh(&atalk_interfaces_lock); + for (iface = atalk_interfaces; 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_interfaces) + retval = &atalk_interfaces->address; + else + retval = NULL; +out: + read_unlock_bh(&atalk_interfaces_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) + goto out_err; + + if (node != ATADDR_BCAST && + iface->address.s_node != node && + node != ATADDR_ANYNODE) + goto out_err; +out: + return iface; +out_err: + iface = NULL; + goto out; +} + +/* Find a match for a specific network:node pair */ +static struct atalk_iface *atalk_find_interface(__be16 net, int node) +{ + struct atalk_iface *iface; + + read_lock_bh(&atalk_interfaces_lock); + for (iface = atalk_interfaces; 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; + } + read_unlock_bh(&atalk_interfaces_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 atalk_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_routes_lock); + for (r = atalk_routes; 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_routes_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 atalk_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 = -EINVAL; + + /* + * Fixme: Raise/Lower a routing change semaphore for these + * operations. + */ + + /* Validate the request */ + if (ta->sat_family != AF_APPLETALK || + (!devhint && ga->sat_family != AF_APPLETALK)) + goto out; + + /* Now walk the routing table and make our decisions */ + write_lock_bh(&atalk_routes_lock); + for (rt = atalk_routes; 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; + + read_lock_bh(&atalk_interfaces_lock); + for (iface = atalk_interfaces; 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; + } + read_unlock_bh(&atalk_interfaces_lock); + + retval = -ENETUNREACH; + if (!riface) + goto out_unlock; + + devhint = riface->dev; + } + + if (!rt) { + rt = kzalloc(sizeof(*rt), GFP_ATOMIC); + + retval = -ENOBUFS; + if (!rt) + goto out_unlock; + + rt->next = atalk_routes; + atalk_routes = rt; + } + + /* Fill in the routing entry */ + rt->target = ta->sat_addr; + dev_hold(devhint); + rt->dev = devhint; + rt->flags = r->rt_flags; + rt->gateway = ga->sat_addr; + + retval = 0; +out_unlock: + write_unlock_bh(&atalk_routes_lock); +out: + return retval; +} + +/* Delete a route. Find it and discard it */ +static int atrtr_delete(struct atalk_addr *addr) +{ + struct atalk_route **r = &atalk_routes; + int retval = 0; + struct atalk_route *tmp; + + write_lock_bh(&atalk_routes_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; + dev_put(tmp->dev); + kfree(tmp); + goto out; + } + r = &tmp->next; + } + retval = -ENOENT; +out: + write_unlock_bh(&atalk_routes_lock); + return retval; +} + +/* + * Called when a device is downed. Just throw away any routes + * via it. + */ +static void atrtr_device_down(struct net_device *dev) +{ + struct atalk_route **r = &atalk_routes; + struct atalk_route *tmp; + + write_lock_bh(&atalk_routes_lock); + while ((tmp = *r) != NULL) { + if (tmp->dev == dev) { + *r = tmp->next; + dev_put(dev); + kfree(tmp); + } else + r = &tmp->next; + } + write_unlock_bh(&atalk_routes_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) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + + if (event == NETDEV_DOWN) + /* Discard any use of this */ + atalk_dev_down(dev); + + return NOTIFY_DONE; +} + +/* ioctl calls. Shouldn't even need touching */ +/* Device configuration ioctl calls */ +static int atif_ioctl(int cmd, void __user *arg) +{ + static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; + struct ifreq atreq; + struct atalk_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(&init_net, 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 atalk_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_global(dev, aarp_mcast); + 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; + /* + * 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 atalk_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; +} + +static int atrtr_ioctl_addrt(struct rtentry *rt) +{ + struct net_device *dev = NULL; + + if (rt->rt_dev) { + char name[IFNAMSIZ]; + + if (copy_from_user(name, rt->rt_dev, IFNAMSIZ-1)) + return -EFAULT; + name[IFNAMSIZ-1] = '\0'; + + dev = __dev_get_by_name(&init_net, name); + if (!dev) + return -ENODEV; + } + return atrtr_create(rt, dev); +} + +/* Routing ioctl() calls */ +static int atrtr_ioctl(unsigned int cmd, void __user *arg) +{ + 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: + return atrtr_ioctl_addrt(&rt); + } + return -EINVAL; +} + +/**************************************************************************\ +* * +* 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) + */ +static unsigned long atalk_sum_partial(const unsigned char *data, + int len, unsigned long sum) +{ + /* This ought to be unwrapped neatly. I'll trust gcc for now */ + while (len--) { + sum += *data++; + sum = rol16(sum, 1); + } + return sum; +} + +/* Checksum skb data -- similar to skb_checksum */ +static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, + int len, unsigned long sum) +{ + int start = skb_headlen(skb); + struct sk_buff *frag_iter; + int i, copy; + + /* checksum stuff in header space */ + if ((copy = start - offset) > 0) { + if (copy > len) + copy = len; + sum = atalk_sum_partial(skb->data + offset, copy, sum); + if ((len -= copy) == 0) + return sum; + + offset += copy; + } + + /* checksum stuff in frags */ + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + int end; + const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + WARN_ON(start > offset + len); + + end = start + skb_frag_size(frag); + if ((copy = end - offset) > 0) { + u8 *vaddr; + + if (copy > len) + copy = len; + vaddr = kmap_atomic(skb_frag_page(frag)); + sum = atalk_sum_partial(vaddr + skb_frag_off(frag) + + offset - start, copy, sum); + kunmap_atomic(vaddr); + + if (!(len -= copy)) + return sum; + offset += copy; + } + start = end; + } + + skb_walk_frags(skb, frag_iter) { + int end; + + WARN_ON(start > offset + len); + + end = start + frag_iter->len; + if ((copy = end - offset) > 0) { + if (copy > len) + copy = len; + sum = atalk_sum_skb(frag_iter, offset - start, + copy, sum); + if ((len -= copy) == 0) + return sum; + offset += copy; + } + start = end; + } + + BUG_ON(len > 0); + + return sum; +} + +static __be16 atalk_checksum(const struct sk_buff *skb, int len) +{ + unsigned long sum; + + /* skip header 4 bytes */ + sum = atalk_sum_skb(skb, 4, len-4, 0); + + /* Use 0xFFFF for 0. 0 itself means none */ + return sum ? htons((unsigned short)sum) : htons(0xFFFF); +} + +static struct proto ddp_proto = { + .name = "DDP", + .owner = THIS_MODULE, + .obj_size = sizeof(struct atalk_sock), +}; + +/* + * Create a socket. Initialise the socket, blank the addresses + * set the state. + */ +static int atalk_create(struct net *net, struct socket *sock, int protocol, + int kern) +{ + struct sock *sk; + int rc = -ESOCKTNOSUPPORT; + + if (!net_eq(net, &init_net)) + return -EAFNOSUPPORT; + + /* + * 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) + */ + if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) + goto out; + + rc = -EPERM; + if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) + goto out; + + rc = -ENOMEM; + sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern); + if (!sk) + goto out; + rc = 0; + sock->ops = &atalk_dgram_ops; + sock_init_data(sock, sk); + + /* Checksums on by default */ + sock_set_flag(sk, SOCK_ZAPPED); +out: + return rc; +} + +/* Free a socket. No work needed */ +static int atalk_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + + if (sk) { + sock_hold(sk); + lock_sock(sk); + + sock_orphan(sk); + sock->sk = NULL; + atalk_destroy_socket(sk); + + release_sock(sk); + sock_put(sk); + } + return 0; +} + +/** + * atalk_pick_and_bind_port - Pick a source port when one is not given + * @sk: socket to insert into the tables + * @sat: address to search for + * + * 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) +{ + int retval; + + write_lock_bh(&atalk_sockets_lock); + + for (sat->sat_port = ATPORT_RESERVED; + sat->sat_port < ATPORT_LAST; + sat->sat_port++) { + struct sock *s; + + sk_for_each(s, &atalk_sockets) { + struct atalk_sock *at = at_sk(s); + + if (at->src_net == sat->sat_addr.s_net && + at->src_node == sat->sat_addr.s_node && + at->src_port == sat->sat_port) + goto try_next_port; + } + + /* Wheee, it's free, assign and insert. */ + __atalk_insert_socket(sk); + at_sk(sk)->src_port = sat->sat_port; + retval = 0; + goto out; + +try_next_port:; + } + + retval = -EBUSY; +out: + write_unlock_bh(&atalk_sockets_lock); + return retval; +} + +static int atalk_autobind(struct sock *sk) +{ + struct atalk_sock *at = at_sk(sk); + struct sockaddr_at sat; + struct atalk_addr *ap = atalk_find_primary(); + int n = -EADDRNOTAVAIL; + + if (!ap || ap->s_net == htons(ATADDR_ANYNET)) + goto out; + + at->src_net = sat.sat_addr.s_net = ap->s_net; + at->src_node = sat.sat_addr.s_node = ap->s_node; + + n = atalk_pick_and_bind_port(sk, &sat); + if (!n) + sock_reset_flag(sk, SOCK_ZAPPED); +out: + return n; +} + +/* 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; + struct atalk_sock *at = at_sk(sk); + int err; + + if (!sock_flag(sk, SOCK_ZAPPED) || + addr_len != sizeof(struct sockaddr_at)) + return -EINVAL; + + if (addr->sat_family != AF_APPLETALK) + return -EAFNOSUPPORT; + + lock_sock(sk); + if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { + struct atalk_addr *ap = atalk_find_primary(); + + err = -EADDRNOTAVAIL; + if (!ap) + goto out; + + at->src_net = addr->sat_addr.s_net = ap->s_net; + at->src_node = addr->sat_addr.s_node = ap->s_node; + } else { + err = -EADDRNOTAVAIL; + if (!atalk_find_interface(addr->sat_addr.s_net, + addr->sat_addr.s_node)) + goto out; + + at->src_net = addr->sat_addr.s_net; + at->src_node = addr->sat_addr.s_node; + } + + if (addr->sat_port == ATADDR_ANYPORT) { + err = atalk_pick_and_bind_port(sk, addr); + + if (err < 0) + goto out; + } else { + at->src_port = addr->sat_port; + + err = -EADDRINUSE; + if (atalk_find_or_insert_socket(sk, addr)) + goto out; + } + + sock_reset_flag(sk, SOCK_ZAPPED); + err = 0; +out: + release_sock(sk); + return err; +} + +/* 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 atalk_sock *at = at_sk(sk); + struct sockaddr_at *addr; + int err; + + sk->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 && + !sock_flag(sk, SOCK_BROADCAST)) { +#if 1 + pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n", + current->comm); +#else + return -EACCES; +#endif + } + + lock_sock(sk); + err = -EBUSY; + if (sock_flag(sk, SOCK_ZAPPED)) + if (atalk_autobind(sk) < 0) + goto out; + + err = -ENETUNREACH; + if (!atrtr_get_dev(&addr->sat_addr)) + goto out; + + at->dest_port = addr->sat_port; + at->dest_net = addr->sat_addr.s_net; + at->dest_node = addr->sat_addr.s_node; + + sock->state = SS_CONNECTED; + sk->sk_state = TCP_ESTABLISHED; + err = 0; +out: + release_sock(sk); + return err; +} + +/* + * 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 peer) +{ + struct sockaddr_at sat; + struct sock *sk = sock->sk; + struct atalk_sock *at = at_sk(sk); + int err; + + lock_sock(sk); + err = -ENOBUFS; + if (sock_flag(sk, SOCK_ZAPPED)) + if (atalk_autobind(sk) < 0) + goto out; + + memset(&sat, 0, sizeof(sat)); + + if (peer) { + err = -ENOTCONN; + if (sk->sk_state != TCP_ESTABLISHED) + goto out; + + sat.sat_addr.s_net = at->dest_net; + sat.sat_addr.s_node = at->dest_node; + sat.sat_port = at->dest_port; + } else { + sat.sat_addr.s_net = at->src_net; + sat.sat_addr.s_node = at->src_node; + sat.sat_port = at->src_port; + } + + sat.sat_family = AF_APPLETALK; + memcpy(uaddr, &sat, sizeof(sat)); + err = sizeof(struct sockaddr_at); + +out: + release_sock(sk); + return err; +} + +#if IS_ENABLED(CONFIG_IPDDP) +static __inline__ int is_ip_over_ddp(struct sk_buff *skb) +{ + return skb->data[12] == 22; +} + +static int handle_ip_over_ddp(struct sk_buff *skb) +{ + struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0"); + struct net_device_stats *stats; + + /* This needs to be able to handle ipddp"N" devices */ + if (!dev) { + kfree_skb(skb); + return NET_RX_DROP; + } + + skb->protocol = htons(ETH_P_IP); + skb_pull(skb, 13); + skb->dev = dev; + skb_reset_transport_header(skb); + + stats = netdev_priv(dev); + stats->rx_packets++; + stats->rx_bytes += skb->len + 13; + return netif_rx(skb); /* Send the SKB up to a higher place. */ +} +#else +/* make it easy for gcc to optimize this test out, i.e. kill the code */ +#define is_ip_over_ddp(skb) 0 +#define handle_ip_over_ddp(skb) 0 +#endif + +static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev, + struct ddpehdr *ddp, __u16 len_hops, int origlen) +{ + struct atalk_route *rt; + struct atalk_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 free_it; + } + + ta.s_net = ddp->deh_dnet; + ta.s_node = ddp->deh_dnode; + + /* Route the packet */ + rt = atrtr_find(&ta); + /* increment hops count */ + len_hops += 1 << 10; + if (!rt || !(len_hops & (15 << 10))) + goto free_it; + + /* FIXME: use skb->cb to be able to use shared skbs */ + + /* + * 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 + (len_hops & 1023)))); + + /* FIXME: use skb->cb to be able to use shared skbs */ + ddp->deh_len_hops = htons(len_hops); + + /* + * 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); + 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 == NULL) + goto drop; + + if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP) + return NET_RX_DROP; + return NET_RX_SUCCESS; +free_it: + kfree_skb(skb); +drop: + return NET_RX_DROP; +} + +/** + * atalk_rcv - Receive a packet (in skb) from device dev + * @skb - packet received + * @dev - network device where the packet comes from + * @pt - packet type + * + * Receive a packet (in skb) from device dev. This has come from the SNAP + * decoder, and on entry skb->transport_header 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 net_device *orig_dev) +{ + struct ddpehdr *ddp; + struct sock *sock; + struct atalk_iface *atif; + struct sockaddr_at tosat; + int origlen; + __u16 len_hops; + + if (!net_eq(dev_net(dev), &init_net)) + goto drop; + + /* Don't mangle buffer if shared */ + if (!(skb = skb_share_check(skb, GFP_ATOMIC))) + goto out; + + /* Size check and make sure header is contiguous */ + if (!pskb_may_pull(skb, sizeof(*ddp))) + goto drop; + + ddp = ddp_hdr(skb); + + len_hops = ntohs(ddp->deh_len_hops); + + /* Trim buffer in case of stray trailing data */ + origlen = skb->len; + skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); + + /* + * Size check to see if ddp->deh_len was crap + * (Otherwise we'll detonate most spectacularly + * in the middle of atalk_checksum() or recvmsg()). + */ + if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { + pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " + "skb->len=%u)\n", len_hops & 1023, skb->len); + goto drop; + } + + /* + * 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(skb, len_hops & 1023) != ddp->deh_sum) + /* Not a valid AppleTalk frame - dustbin time */ + goto drop; + + /* 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); + + if (!atif) { + /* Not ours, so we route the packet via the correct + * AppleTalk iface + */ + return atalk_route_packet(skb, dev, ddp, len_hops, origlen); + } + + /* if IP over DDP is not selected this code will be optimized out */ + if (is_ip_over_ddp(skb)) + return handle_ip_over_ddp(skb); + /* + * 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 drop; + + /* Queue packet (standard) */ + if (sock_queue_rcv_skb(sock, skb) < 0) + goto drop; + + return NET_RX_SUCCESS; + +drop: + kfree_skb(skb); +out: + return NET_RX_DROP; + +} + +/* + * 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 net_device *orig_dev) +{ + if (!net_eq(dev_net(dev), &init_net)) + goto freeit; + + /* Expand any short form frames */ + if (skb_mac_header(skb)[2] == 1) { + struct ddpehdr *ddp; + /* Find our address */ + struct atalk_addr *ap = atalk_find_dev_addr(dev); + + if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) + goto freeit; + + /* Don't mangle buffer if shared */ + if (!(skb = skb_share_check(skb, GFP_ATOMIC))) + return 0; + + /* + * The push leaves us with a ddephdr not an shdr, and + * handily the port bytes in the right place preset. + */ + ddp = skb_push(skb, sizeof(*ddp) - 4); + + /* 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_header(skb)[0]; /* From physical header */ + ddp->deh_snode = skb_mac_header(skb)[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... + */ + /* Non routable, so force a drop if we slip up later */ + ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); + } + skb_reset_transport_header(skb); + + return atalk_rcv(skb, dev, pt, orig_dev); +freeit: + kfree_skb(skb); + return 0; +} + +static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) +{ + struct sock *sk = sock->sk; + struct atalk_sock *at = at_sk(sk); + DECLARE_SOCKADDR(struct sockaddr_at *, usat, 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, hard_header_len; + struct atalk_route *rt, *rt_lo = NULL; + int err; + + if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) + return -EINVAL; + + if (len > DDP_MAXSZ) + return -EMSGSIZE; + + lock_sock(sk); + if (usat) { + err = -EBUSY; + if (sock_flag(sk, SOCK_ZAPPED)) + if (atalk_autobind(sk) < 0) + goto out; + + err = -EINVAL; + if (msg->msg_namelen < sizeof(*usat) || + usat->sat_family != AF_APPLETALK) + goto out; + + err = -EPERM; + /* netatalk didn't implement this check */ + if (usat->sat_addr.s_node == ATADDR_BCAST && + !sock_flag(sk, SOCK_BROADCAST)) { + goto out; + } + } else { + err = -ENOTCONN; + if (sk->sk_state != TCP_ESTABLISHED) + goto out; + usat = &local_satalk; + usat->sat_family = AF_APPLETALK; + usat->sat_port = at->dest_port; + usat->sat_addr.s_node = at->dest_node; + usat->sat_addr.s_net = 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); + } else { + struct atalk_addr at_hint; + + at_hint.s_node = 0; + at_hint.s_net = at->src_net; + + rt = atrtr_find(&at_hint); + } + err = -ENETUNREACH; + if (!rt) + goto out; + + dev = rt->dev; + + SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", + sk, size, dev->name); + + hard_header_len = dev->hard_header_len; + /* Leave room for loopback hardware header if necessary */ + if (usat->sat_addr.s_node == ATADDR_BCAST && + (dev->flags & IFF_LOOPBACK || !(rt->flags & RTF_GATEWAY))) { + struct atalk_addr at_lo; + + at_lo.s_node = 0; + at_lo.s_net = 0; + + rt_lo = atrtr_find(&at_lo); + + if (rt_lo && rt_lo->dev->hard_header_len > hard_header_len) + hard_header_len = rt_lo->dev->hard_header_len; + } + + size += hard_header_len; + release_sock(sk); + skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); + lock_sock(sk); + if (!skb) + goto out; + + skb_reserve(skb, ddp_dl->header_length); + skb_reserve(skb, hard_header_len); + skb->dev = dev; + + SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); + + ddp = skb_put(skb, sizeof(struct ddpehdr)); + ddp->deh_len_hops = htons(len + sizeof(*ddp)); + ddp->deh_dnet = usat->sat_addr.s_net; + ddp->deh_snet = at->src_net; + ddp->deh_dnode = usat->sat_addr.s_node; + ddp->deh_snode = at->src_node; + ddp->deh_dport = usat->sat_port; + ddp->deh_sport = at->src_port; + + SOCK_DEBUG(sk, "SK %p: Copy user data (%zd bytes).\n", sk, len); + + err = memcpy_from_msg(skb_put(skb, len), msg, len); + if (err) { + kfree_skb(skb); + err = -EFAULT; + goto out; + } + + if (sk->sk_no_check_tx) + ddp->deh_sum = 0; + else + ddp->deh_sum = atalk_checksum(skb, 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 it fails it is queued/sent above in the aarp queue + */ + aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL); + } + } + + if (dev->flags & IFF_LOOPBACK || loopback) { + SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); + /* loop back */ + skb_orphan(skb); + if (ddp->deh_dnode == ATADDR_BCAST) { + if (!rt_lo) { + kfree_skb(skb); + err = -ENETUNREACH; + goto out; + } + dev = rt_lo->dev; + skb->dev = dev; + } + ddp_dl->request(ddp_dl, skb, dev->dev_addr); + } else { + SOCK_DEBUG(sk, "SK %p: send out.\n", sk); + if (rt->flags & RTF_GATEWAY) { + gsat.sat_addr = rt->gateway; + usat = &gsat; + } + + /* + * If it fails it is queued/sent above in the aarp queue + */ + aarp_send_ddp(dev, skb, &usat->sat_addr, NULL); + } + SOCK_DEBUG(sk, "SK %p: Done write (%zd).\n", sk, len); + +out: + release_sock(sk); + return err ? : len; +} + +static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, + int flags) +{ + struct sock *sk = sock->sk; + struct ddpehdr *ddp; + int copied = 0; + int offset = 0; + int err = 0; + struct sk_buff *skb; + + skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, + flags & MSG_DONTWAIT, &err); + lock_sock(sk); + + if (!skb) + goto out; + + /* FIXME: use skb->cb to be able to use shared skbs */ + ddp = ddp_hdr(skb); + copied = ntohs(ddp->deh_len_hops) & 1023; + + if (sk->sk_type != SOCK_RAW) { + offset = sizeof(*ddp); + copied -= offset; + } + + if (copied > size) { + copied = size; + msg->msg_flags |= MSG_TRUNC; + } + err = skb_copy_datagram_msg(skb, offset, msg, copied); + + if (!err && msg->msg_name) { + DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name); + 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. */ + +out: + release_sock(sk); + return err ? : copied; +} + + +/* + * AppleTalk ioctl calls. + */ +static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +{ + int rc = -ENOIOCTLCMD; + struct sock *sk = sock->sk; + void __user *argp = (void __user *)arg; + + switch (cmd) { + /* Protocol layer */ + case TIOCOUTQ: { + long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); + + if (amount < 0) + amount = 0; + rc = put_user(amount, (int __user *)argp); + break; + } + case TIOCINQ: { + struct sk_buff *skb; + long amount = 0; + + spin_lock_irq(&sk->sk_receive_queue.lock); + skb = skb_peek(&sk->sk_receive_queue); + if (skb) + amount = skb->len - sizeof(struct ddpehdr); + spin_unlock_irq(&sk->sk_receive_queue.lock); + rc = put_user(amount, (int __user *)argp); + break; + } + /* Routing */ + case SIOCADDRT: + case SIOCDELRT: + rc = -EPERM; + if (capable(CAP_NET_ADMIN)) + rc = atrtr_ioctl(cmd, argp); + break; + /* Interface */ + case SIOCGIFADDR: + case SIOCSIFADDR: + case SIOCGIFBRDADDR: + case SIOCATALKDIFADDR: + case SIOCDIFADDR: + case SIOCSARP: /* proxy AARP */ + case SIOCDARP: /* proxy AARP */ + rtnl_lock(); + rc = atif_ioctl(cmd, argp); + rtnl_unlock(); + break; + } + + return rc; +} + + +#ifdef CONFIG_COMPAT +static int atalk_compat_routing_ioctl(struct sock *sk, unsigned int cmd, + struct compat_rtentry __user *ur) +{ + compat_uptr_t rtdev; + struct rtentry rt; + + if (copy_from_user(&rt.rt_dst, &ur->rt_dst, + 3 * sizeof(struct sockaddr)) || + get_user(rt.rt_flags, &ur->rt_flags) || + get_user(rt.rt_metric, &ur->rt_metric) || + get_user(rt.rt_mtu, &ur->rt_mtu) || + get_user(rt.rt_window, &ur->rt_window) || + get_user(rt.rt_irtt, &ur->rt_irtt) || + get_user(rtdev, &ur->rt_dev)) + 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: + rt.rt_dev = compat_ptr(rtdev); + return atrtr_ioctl_addrt(&rt); + default: + return -EINVAL; + } +} +static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +{ + void __user *argp = compat_ptr(arg); + struct sock *sk = sock->sk; + + switch (cmd) { + case SIOCADDRT: + case SIOCDELRT: + return atalk_compat_routing_ioctl(sk, cmd, argp); + /* + * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we + * cannot handle it in common code. The data we access if ifreq + * here is compatible, so we can simply call the native + * handler. + */ + case SIOCATALKDIFADDR: + return atalk_ioctl(sock, cmd, (unsigned long)argp); + default: + return -ENOIOCTLCMD; + } +} +#endif /* CONFIG_COMPAT */ + + +static const struct net_proto_family atalk_family_ops = { + .family = PF_APPLETALK, + .create = atalk_create, + .owner = THIS_MODULE, +}; + +static const struct proto_ops atalk_dgram_ops = { + .family = PF_APPLETALK, + .owner = THIS_MODULE, + .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, + .gettstamp = sock_gettstamp, +#ifdef CONFIG_COMPAT + .compat_ioctl = atalk_compat_ioctl, +#endif + .listen = sock_no_listen, + .shutdown = sock_no_shutdown, + .sendmsg = atalk_sendmsg, + .recvmsg = atalk_recvmsg, + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, +}; + +static struct notifier_block ddp_notifier = { + .notifier_call = ddp_device_event, +}; + +static struct packet_type ltalk_packet_type __read_mostly = { + .type = cpu_to_be16(ETH_P_LOCALTALK), + .func = ltalk_rcv, +}; + +static struct packet_type ppptalk_packet_type __read_mostly = { + .type = cpu_to_be16(ETH_P_PPPTALK), + .func = atalk_rcv, +}; + +static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; + +/* Export symbols for use by drivers when AppleTalk is a module */ +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) +{ + int rc; + + rc = proto_register(&ddp_proto, 0); + if (rc) + goto out; + + rc = sock_register(&atalk_family_ops); + if (rc) + goto out_proto; + + ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); + if (!ddp_dl) { + pr_crit("Unable to register DDP with SNAP.\n"); + rc = -ENOMEM; + goto out_sock; + } + + dev_add_pack(<alk_packet_type); + dev_add_pack(&ppptalk_packet_type); + + rc = register_netdevice_notifier(&ddp_notifier); + if (rc) + goto out_snap; + + rc = aarp_proto_init(); + if (rc) + goto out_dev; + + rc = atalk_proc_init(); + if (rc) + goto out_aarp; + + rc = atalk_register_sysctl(); + if (rc) + goto out_proc; +out: + return rc; +out_proc: + atalk_proc_exit(); +out_aarp: + aarp_cleanup_module(); +out_dev: + unregister_netdevice_notifier(&ddp_notifier); +out_snap: + dev_remove_pack(&ppptalk_packet_type); + dev_remove_pack(<alk_packet_type); + unregister_snap_client(ddp_dl); +out_sock: + sock_unregister(PF_APPLETALK); +out_proto: + proto_unregister(&ddp_proto); + goto out; +} +module_init(atalk_init); + +/* + * No explicit module reference count manipulation is needed in the + * protocol. Socket layer sets module reference count for us + * and interfaces reference counting is done + * by the network device layer. + * + * 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 */ + atalk_proc_exit(); + 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_dl); + sock_unregister(PF_APPLETALK); + proto_unregister(&ddp_proto); +} +module_exit(atalk_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); +MODULE_DESCRIPTION("AppleTalk 0.20\n"); +MODULE_ALIAS_NETPROTO(PF_APPLETALK); diff --git a/net/appletalk/dev.c b/net/appletalk/dev.c new file mode 100644 index 000000000..284c8e585 --- /dev/null +++ b/net/appletalk/dev.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Moved here from drivers/net/net_init.c, which is: + * Written 1993,1994,1995 by Donald Becker. + */ + +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/if_ltalk.h> + +static void ltalk_setup(struct net_device *dev) +{ + /* Fill in the fields of the device structure with localtalk-generic values. */ + + dev->type = ARPHRD_LOCALTLK; + dev->hard_header_len = LTALK_HLEN; + dev->mtu = LTALK_MTU; + dev->addr_len = LTALK_ALEN; + dev->tx_queue_len = 10; + + dev->broadcast[0] = 0xFF; + + dev->flags = IFF_BROADCAST|IFF_MULTICAST|IFF_NOARP; +} + +/** + * alloc_ltalkdev - Allocates and sets up an localtalk device + * @sizeof_priv: Size of additional driver-private structure to be allocated + * for this localtalk device + * + * Fill in the fields of the device structure with localtalk-generic + * values. Basically does everything except registering the device. + * + * Constructs a new net device, complete with a private data area of + * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for + * this private data area. + */ + +struct net_device *alloc_ltalkdev(int sizeof_priv) +{ + return alloc_netdev(sizeof_priv, "lt%d", NET_NAME_UNKNOWN, + ltalk_setup); +} +EXPORT_SYMBOL(alloc_ltalkdev); diff --git a/net/appletalk/sysctl_net_atalk.c b/net/appletalk/sysctl_net_atalk.c new file mode 100644 index 000000000..d945b7c01 --- /dev/null +++ b/net/appletalk/sysctl_net_atalk.c @@ -0,0 +1,59 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * sysctl_net_atalk.c: sysctl interface to net AppleTalk subsystem. + * + * Begun April 1, 1996, Mike Shaver. + * Added /proc/sys/net/atalk directory entry (empty =) ). [MS] + * Dynamic registration, added aarp entries. (5/30/97 Chris Horn) + */ + +#include <linux/sysctl.h> +#include <net/sock.h> +#include <linux/atalk.h> + +static struct ctl_table atalk_table[] = { + { + .procname = "aarp-expiry-time", + .data = &sysctl_aarp_expiry_time, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_jiffies, + }, + { + .procname = "aarp-tick-time", + .data = &sysctl_aarp_tick_time, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_jiffies, + }, + { + .procname = "aarp-retransmit-limit", + .data = &sysctl_aarp_retransmit_limit, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "aarp-resolve-time", + .data = &sysctl_aarp_resolve_time, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_jiffies, + }, + { }, +}; + +static struct ctl_table_header *atalk_table_header; + +int __init atalk_register_sysctl(void) +{ + atalk_table_header = register_net_sysctl(&init_net, "net/appletalk", atalk_table); + if (!atalk_table_header) + return -ENOMEM; + return 0; +} + +void atalk_unregister_sysctl(void) +{ + unregister_net_sysctl_table(atalk_table_header); +} |