| /* net/atm/clip.c - RFC1577 Classical IP over ATM */ |
| |
| /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
| |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> /* for UINT_MAX */ |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/netdevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/wait.h> |
| #include <linux/timer.h> |
| #include <linux/if_arp.h> /* for some manifest constants */ |
| #include <linux/notifier.h> |
| #include <linux/atm.h> |
| #include <linux/atmdev.h> |
| #include <linux/atmclip.h> |
| #include <linux/atmarp.h> |
| #include <linux/capability.h> |
| #include <linux/ip.h> /* for net/route.h */ |
| #include <linux/in.h> /* for struct sockaddr_in */ |
| #include <linux/if.h> /* for IFF_UP */ |
| #include <linux/inetdevice.h> |
| #include <linux/bitops.h> |
| #include <linux/poison.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/rcupdate.h> |
| #include <linux/jhash.h> |
| #include <linux/slab.h> |
| #include <net/route.h> /* for struct rtable and routing */ |
| #include <net/icmp.h> /* icmp_send */ |
| #include <net/arp.h> |
| #include <linux/param.h> /* for HZ */ |
| #include <linux/uaccess.h> |
| #include <asm/byteorder.h> /* for htons etc. */ |
| #include <linux/atomic.h> |
| |
| #include "common.h" |
| #include "resources.h" |
| #include <net/atmclip.h> |
| |
| static struct net_device *clip_devs; |
| static struct atm_vcc *atmarpd; |
| static struct timer_list idle_timer; |
| static const struct neigh_ops clip_neigh_ops; |
| |
| static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) |
| { |
| struct sock *sk; |
| struct atmarp_ctrl *ctrl; |
| struct sk_buff *skb; |
| |
| pr_debug("(%d)\n", type); |
| if (!atmarpd) |
| return -EUNATCH; |
| skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC); |
| if (!skb) |
| return -ENOMEM; |
| ctrl = skb_put(skb, sizeof(struct atmarp_ctrl)); |
| ctrl->type = type; |
| ctrl->itf_num = itf; |
| ctrl->ip = ip; |
| atm_force_charge(atmarpd, skb->truesize); |
| |
| sk = sk_atm(atmarpd); |
| skb_queue_tail(&sk->sk_receive_queue, skb); |
| sk->sk_data_ready(sk); |
| return 0; |
| } |
| |
| static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) |
| { |
| pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh); |
| clip_vcc->entry = entry; |
| clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ |
| clip_vcc->next = entry->vccs; |
| entry->vccs = clip_vcc; |
| entry->neigh->used = jiffies; |
| } |
| |
| static void unlink_clip_vcc(struct clip_vcc *clip_vcc) |
| { |
| struct atmarp_entry *entry = clip_vcc->entry; |
| struct clip_vcc **walk; |
| |
| if (!entry) { |
| pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); |
| return; |
| } |
| netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ |
| entry->neigh->used = jiffies; |
| for (walk = &entry->vccs; *walk; walk = &(*walk)->next) |
| if (*walk == clip_vcc) { |
| int error; |
| |
| *walk = clip_vcc->next; /* atomic */ |
| clip_vcc->entry = NULL; |
| if (clip_vcc->xoff) |
| netif_wake_queue(entry->neigh->dev); |
| if (entry->vccs) |
| goto out; |
| entry->expires = jiffies - 1; |
| /* force resolution or expiration */ |
| error = neigh_update(entry->neigh, NULL, NUD_NONE, |
| NEIGH_UPDATE_F_ADMIN, 0); |
| if (error) |
| pr_crit("neigh_update failed with %d\n", error); |
| goto out; |
| } |
| pr_crit("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc); |
| out: |
| netif_tx_unlock_bh(entry->neigh->dev); |
| } |
| |
| /* The neighbour entry n->lock is held. */ |
| static int neigh_check_cb(struct neighbour *n) |
| { |
| struct atmarp_entry *entry = neighbour_priv(n); |
| struct clip_vcc *cv; |
| |
| if (n->ops != &clip_neigh_ops) |
| return 0; |
| for (cv = entry->vccs; cv; cv = cv->next) { |
| unsigned long exp = cv->last_use + cv->idle_timeout; |
| |
| if (cv->idle_timeout && time_after(jiffies, exp)) { |
| pr_debug("releasing vcc %p->%p of entry %p\n", |
| cv, cv->vcc, entry); |
| vcc_release_async(cv->vcc, -ETIMEDOUT); |
| } |
| } |
| |
| if (entry->vccs || time_before(jiffies, entry->expires)) |
| return 0; |
| |
| if (refcount_read(&n->refcnt) > 1) { |
| struct sk_buff *skb; |
| |
| pr_debug("destruction postponed with ref %d\n", |
| refcount_read(&n->refcnt)); |
| |
| while ((skb = skb_dequeue(&n->arp_queue)) != NULL) |
| dev_kfree_skb(skb); |
| |
| return 0; |
| } |
| |
| pr_debug("expired neigh %p\n", n); |
| return 1; |
| } |
| |
| static void idle_timer_check(unsigned long dummy) |
| { |
| write_lock(&arp_tbl.lock); |
| __neigh_for_each_release(&arp_tbl, neigh_check_cb); |
| mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); |
| write_unlock(&arp_tbl.lock); |
| } |
| |
| static int clip_arp_rcv(struct sk_buff *skb) |
| { |
| struct atm_vcc *vcc; |
| |
| pr_debug("\n"); |
| vcc = ATM_SKB(skb)->vcc; |
| if (!vcc || !atm_charge(vcc, skb->truesize)) { |
| dev_kfree_skb_any(skb); |
| return 0; |
| } |
| pr_debug("pushing to %p\n", vcc); |
| pr_debug("using %p\n", CLIP_VCC(vcc)->old_push); |
| CLIP_VCC(vcc)->old_push(vcc, skb); |
| return 0; |
| } |
| |
| static const unsigned char llc_oui[] = { |
| 0xaa, /* DSAP: non-ISO */ |
| 0xaa, /* SSAP: non-ISO */ |
| 0x03, /* Ctrl: Unnumbered Information Command PDU */ |
| 0x00, /* OUI: EtherType */ |
| 0x00, |
| 0x00 |
| }; |
| |
| static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) |
| { |
| struct clip_vcc *clip_vcc = CLIP_VCC(vcc); |
| |
| pr_debug("\n"); |
| |
| if (!clip_devs) { |
| atm_return(vcc, skb->truesize); |
| kfree_skb(skb); |
| return; |
| } |
| |
| if (!skb) { |
| pr_debug("removing VCC %p\n", clip_vcc); |
| if (clip_vcc->entry) |
| unlink_clip_vcc(clip_vcc); |
| clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ |
| kfree(clip_vcc); |
| return; |
| } |
| atm_return(vcc, skb->truesize); |
| skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; |
| /* clip_vcc->entry == NULL if we don't have an IP address yet */ |
| if (!skb->dev) { |
| dev_kfree_skb_any(skb); |
| return; |
| } |
| ATM_SKB(skb)->vcc = vcc; |
| skb_reset_mac_header(skb); |
| if (!clip_vcc->encap || |
| skb->len < RFC1483LLC_LEN || |
| memcmp(skb->data, llc_oui, sizeof(llc_oui))) |
| skb->protocol = htons(ETH_P_IP); |
| else { |
| skb->protocol = ((__be16 *)skb->data)[3]; |
| skb_pull(skb, RFC1483LLC_LEN); |
| if (skb->protocol == htons(ETH_P_ARP)) { |
| skb->dev->stats.rx_packets++; |
| skb->dev->stats.rx_bytes += skb->len; |
| clip_arp_rcv(skb); |
| return; |
| } |
| } |
| clip_vcc->last_use = jiffies; |
| skb->dev->stats.rx_packets++; |
| skb->dev->stats.rx_bytes += skb->len; |
| memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
| netif_rx(skb); |
| } |
| |
| /* |
| * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that |
| * clip_pop is atomic with respect to the critical section in clip_start_xmit. |
| */ |
| |
| static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
| { |
| struct clip_vcc *clip_vcc = CLIP_VCC(vcc); |
| struct net_device *dev = skb->dev; |
| int old; |
| unsigned long flags; |
| |
| pr_debug("(vcc %p)\n", vcc); |
| clip_vcc->old_pop(vcc, skb); |
| /* skb->dev == NULL in outbound ARP packets */ |
| if (!dev) |
| return; |
| spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); |
| if (atm_may_send(vcc, 0)) { |
| old = xchg(&clip_vcc->xoff, 0); |
| if (old) |
| netif_wake_queue(dev); |
| } |
| spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); |
| } |
| |
| static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) |
| { |
| __be32 *ip = (__be32 *) neigh->primary_key; |
| |
| pr_debug("(neigh %p, skb %p)\n", neigh, skb); |
| to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip); |
| } |
| |
| static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) |
| { |
| #ifndef CONFIG_ATM_CLIP_NO_ICMP |
| icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
| #endif |
| kfree_skb(skb); |
| } |
| |
| static const struct neigh_ops clip_neigh_ops = { |
| .family = AF_INET, |
| .solicit = clip_neigh_solicit, |
| .error_report = clip_neigh_error, |
| .output = neigh_direct_output, |
| .connected_output = neigh_direct_output, |
| }; |
| |
| static int clip_constructor(struct net_device *dev, struct neighbour *neigh) |
| { |
| struct atmarp_entry *entry = neighbour_priv(neigh); |
| |
| if (neigh->tbl->family != AF_INET) |
| return -EINVAL; |
| |
| if (neigh->type != RTN_UNICAST) |
| return -EINVAL; |
| |
| neigh->nud_state = NUD_NONE; |
| neigh->ops = &clip_neigh_ops; |
| neigh->output = neigh->ops->output; |
| entry->neigh = neigh; |
| entry->vccs = NULL; |
| entry->expires = jiffies - 1; |
| |
| return 0; |
| } |
| |
| /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ |
| |
| /* |
| * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means |
| * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, |
| * don't increment the usage count. This is used to create entries in |
| * clip_setentry. |
| */ |
| |
| static int clip_encap(struct atm_vcc *vcc, int mode) |
| { |
| if (!CLIP_VCC(vcc)) |
| return -EBADFD; |
| |
| CLIP_VCC(vcc)->encap = mode; |
| return 0; |
| } |
| |
| static netdev_tx_t clip_start_xmit(struct sk_buff *skb, |
| struct net_device *dev) |
| { |
| struct clip_priv *clip_priv = PRIV(dev); |
| struct dst_entry *dst = skb_dst(skb); |
| struct atmarp_entry *entry; |
| struct neighbour *n; |
| struct atm_vcc *vcc; |
| struct rtable *rt; |
| __be32 *daddr; |
| int old; |
| unsigned long flags; |
| |
| pr_debug("(skb %p)\n", skb); |
| if (!dst) { |
| pr_err("skb_dst(skb) == NULL\n"); |
| dev_kfree_skb(skb); |
| dev->stats.tx_dropped++; |
| return NETDEV_TX_OK; |
| } |
| rt = (struct rtable *) dst; |
| if (rt->rt_gateway) |
| daddr = &rt->rt_gateway; |
| else |
| daddr = &ip_hdr(skb)->daddr; |
| n = dst_neigh_lookup(dst, daddr); |
| if (!n) { |
| pr_err("NO NEIGHBOUR !\n"); |
| dev_kfree_skb(skb); |
| dev->stats.tx_dropped++; |
| return NETDEV_TX_OK; |
| } |
| entry = neighbour_priv(n); |
| if (!entry->vccs) { |
| if (time_after(jiffies, entry->expires)) { |
| /* should be resolved */ |
| entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; |
| to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key)); |
| } |
| if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) |
| skb_queue_tail(&entry->neigh->arp_queue, skb); |
| else { |
| dev_kfree_skb(skb); |
| dev->stats.tx_dropped++; |
| } |
| goto out_release_neigh; |
| } |
| pr_debug("neigh %p, vccs %p\n", entry, entry->vccs); |
| ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; |
| pr_debug("using neighbour %p, vcc %p\n", n, vcc); |
| if (entry->vccs->encap) { |
| void *here; |
| |
| here = skb_push(skb, RFC1483LLC_LEN); |
| memcpy(here, llc_oui, sizeof(llc_oui)); |
| ((__be16 *) here)[3] = skb->protocol; |
| } |
| refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); |
| ATM_SKB(skb)->atm_options = vcc->atm_options; |
| entry->vccs->last_use = jiffies; |
| pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); |
| old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ |
| if (old) { |
| pr_warn("XOFF->XOFF transition\n"); |
| goto out_release_neigh; |
| } |
| dev->stats.tx_packets++; |
| dev->stats.tx_bytes += skb->len; |
| vcc->send(vcc, skb); |
| if (atm_may_send(vcc, 0)) { |
| entry->vccs->xoff = 0; |
| goto out_release_neigh; |
| } |
| spin_lock_irqsave(&clip_priv->xoff_lock, flags); |
| netif_stop_queue(dev); /* XOFF -> throttle immediately */ |
| barrier(); |
| if (!entry->vccs->xoff) |
| netif_start_queue(dev); |
| /* Oh, we just raced with clip_pop. netif_start_queue should be |
| good enough, because nothing should really be asleep because |
| of the brief netif_stop_queue. If this isn't true or if it |
| changes, use netif_wake_queue instead. */ |
| spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); |
| out_release_neigh: |
| neigh_release(n); |
| return NETDEV_TX_OK; |
| } |
| |
| static int clip_mkip(struct atm_vcc *vcc, int timeout) |
| { |
| struct clip_vcc *clip_vcc; |
| |
| if (!vcc->push) |
| return -EBADFD; |
| clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); |
| if (!clip_vcc) |
| return -ENOMEM; |
| pr_debug("%p vcc %p\n", clip_vcc, vcc); |
| clip_vcc->vcc = vcc; |
| vcc->user_back = clip_vcc; |
| set_bit(ATM_VF_IS_CLIP, &vcc->flags); |
| clip_vcc->entry = NULL; |
| clip_vcc->xoff = 0; |
| clip_vcc->encap = 1; |
| clip_vcc->last_use = jiffies; |
| clip_vcc->idle_timeout = timeout * HZ; |
| clip_vcc->old_push = vcc->push; |
| clip_vcc->old_pop = vcc->pop; |
| vcc->push = clip_push; |
| vcc->pop = clip_pop; |
| |
| /* re-process everything received between connection setup and MKIP */ |
| vcc_process_recv_queue(vcc); |
| |
| return 0; |
| } |
| |
| static int clip_setentry(struct atm_vcc *vcc, __be32 ip) |
| { |
| struct neighbour *neigh; |
| struct atmarp_entry *entry; |
| int error; |
| struct clip_vcc *clip_vcc; |
| struct rtable *rt; |
| |
| if (vcc->push != clip_push) { |
| pr_warn("non-CLIP VCC\n"); |
| return -EBADF; |
| } |
| clip_vcc = CLIP_VCC(vcc); |
| if (!ip) { |
| if (!clip_vcc->entry) { |
| pr_err("hiding hidden ATMARP entry\n"); |
| return 0; |
| } |
| pr_debug("remove\n"); |
| unlink_clip_vcc(clip_vcc); |
| return 0; |
| } |
| rt = ip_route_output(&init_net, ip, 0, 1, 0); |
| if (IS_ERR(rt)) |
| return PTR_ERR(rt); |
| neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1); |
| ip_rt_put(rt); |
| if (!neigh) |
| return -ENOMEM; |
| entry = neighbour_priv(neigh); |
| if (entry != clip_vcc->entry) { |
| if (!clip_vcc->entry) |
| pr_debug("add\n"); |
| else { |
| pr_debug("update\n"); |
| unlink_clip_vcc(clip_vcc); |
| } |
| link_vcc(clip_vcc, entry); |
| } |
| error = neigh_update(neigh, llc_oui, NUD_PERMANENT, |
| NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, 0); |
| neigh_release(neigh); |
| return error; |
| } |
| |
| static const struct net_device_ops clip_netdev_ops = { |
| .ndo_start_xmit = clip_start_xmit, |
| .ndo_neigh_construct = clip_constructor, |
| }; |
| |
| static void clip_setup(struct net_device *dev) |
| { |
| dev->netdev_ops = &clip_netdev_ops; |
| dev->type = ARPHRD_ATM; |
| dev->neigh_priv_len = sizeof(struct atmarp_entry); |
| dev->hard_header_len = RFC1483LLC_LEN; |
| dev->mtu = RFC1626_MTU; |
| dev->tx_queue_len = 100; /* "normal" queue (packets) */ |
| /* When using a "real" qdisc, the qdisc determines the queue */ |
| /* length. tx_queue_len is only used for the default case, */ |
| /* without any more elaborate queuing. 100 is a reasonable */ |
| /* compromise between decent burst-tolerance and protection */ |
| /* against memory hogs. */ |
| netif_keep_dst(dev); |
| } |
| |
| static int clip_create(int number) |
| { |
| struct net_device *dev; |
| struct clip_priv *clip_priv; |
| int error; |
| |
| if (number != -1) { |
| for (dev = clip_devs; dev; dev = PRIV(dev)->next) |
| if (PRIV(dev)->number == number) |
| return -EEXIST; |
| } else { |
| number = 0; |
| for (dev = clip_devs; dev; dev = PRIV(dev)->next) |
| if (PRIV(dev)->number >= number) |
| number = PRIV(dev)->number + 1; |
| } |
| dev = alloc_netdev(sizeof(struct clip_priv), "", NET_NAME_UNKNOWN, |
| clip_setup); |
| if (!dev) |
| return -ENOMEM; |
| clip_priv = PRIV(dev); |
| sprintf(dev->name, "atm%d", number); |
| spin_lock_init(&clip_priv->xoff_lock); |
| clip_priv->number = number; |
| error = register_netdev(dev); |
| if (error) { |
| free_netdev(dev); |
| return error; |
| } |
| clip_priv->next = clip_devs; |
| clip_devs = dev; |
| pr_debug("registered (net:%s)\n", dev->name); |
| return number; |
| } |
| |
| static int clip_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_UNREGISTER) |
| return NOTIFY_DONE; |
| |
| /* ignore non-CLIP devices */ |
| if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) |
| return NOTIFY_DONE; |
| |
| switch (event) { |
| case NETDEV_UP: |
| pr_debug("NETDEV_UP\n"); |
| to_atmarpd(act_up, PRIV(dev)->number, 0); |
| break; |
| case NETDEV_GOING_DOWN: |
| pr_debug("NETDEV_DOWN\n"); |
| to_atmarpd(act_down, PRIV(dev)->number, 0); |
| break; |
| case NETDEV_CHANGE: |
| case NETDEV_CHANGEMTU: |
| pr_debug("NETDEV_CHANGE*\n"); |
| to_atmarpd(act_change, PRIV(dev)->number, 0); |
| break; |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static int clip_inet_event(struct notifier_block *this, unsigned long event, |
| void *ifa) |
| { |
| struct in_device *in_dev; |
| struct netdev_notifier_info info; |
| |
| in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; |
| /* |
| * Transitions are of the down-change-up type, so it's sufficient to |
| * handle the change on up. |
| */ |
| if (event != NETDEV_UP) |
| return NOTIFY_DONE; |
| netdev_notifier_info_init(&info, in_dev->dev); |
| return clip_device_event(this, NETDEV_CHANGE, &info); |
| } |
| |
| static struct notifier_block clip_dev_notifier = { |
| .notifier_call = clip_device_event, |
| }; |
| |
| |
| |
| static struct notifier_block clip_inet_notifier = { |
| .notifier_call = clip_inet_event, |
| }; |
| |
| |
| |
| static void atmarpd_close(struct atm_vcc *vcc) |
| { |
| pr_debug("\n"); |
| |
| rtnl_lock(); |
| atmarpd = NULL; |
| skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); |
| rtnl_unlock(); |
| |
| pr_debug("(done)\n"); |
| module_put(THIS_MODULE); |
| } |
| |
| static struct atmdev_ops atmarpd_dev_ops = { |
| .close = atmarpd_close |
| }; |
| |
| |
| static struct atm_dev atmarpd_dev = { |
| .ops = &atmarpd_dev_ops, |
| .type = "arpd", |
| .number = 999, |
| .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) |
| }; |
| |
| |
| static int atm_init_atmarp(struct atm_vcc *vcc) |
| { |
| rtnl_lock(); |
| if (atmarpd) { |
| rtnl_unlock(); |
| return -EADDRINUSE; |
| } |
| |
| mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); |
| |
| atmarpd = vcc; |
| set_bit(ATM_VF_META, &vcc->flags); |
| set_bit(ATM_VF_READY, &vcc->flags); |
| /* allow replies and avoid getting closed if signaling dies */ |
| vcc->dev = &atmarpd_dev; |
| vcc_insert_socket(sk_atm(vcc)); |
| vcc->push = NULL; |
| vcc->pop = NULL; /* crash */ |
| vcc->push_oam = NULL; /* crash */ |
| rtnl_unlock(); |
| return 0; |
| } |
| |
| static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| { |
| struct atm_vcc *vcc = ATM_SD(sock); |
| int err = 0; |
| |
| switch (cmd) { |
| case SIOCMKCLIP: |
| case ATMARPD_CTRL: |
| case ATMARP_MKIP: |
| case ATMARP_SETENTRY: |
| case ATMARP_ENCAP: |
| if (!capable(CAP_NET_ADMIN)) |
| return -EPERM; |
| break; |
| default: |
| return -ENOIOCTLCMD; |
| } |
| |
| switch (cmd) { |
| case SIOCMKCLIP: |
| err = clip_create(arg); |
| break; |
| case ATMARPD_CTRL: |
| err = atm_init_atmarp(vcc); |
| if (!err) { |
| sock->state = SS_CONNECTED; |
| __module_get(THIS_MODULE); |
| } |
| break; |
| case ATMARP_MKIP: |
| err = clip_mkip(vcc, arg); |
| break; |
| case ATMARP_SETENTRY: |
| err = clip_setentry(vcc, (__force __be32)arg); |
| break; |
| case ATMARP_ENCAP: |
| err = clip_encap(vcc, arg); |
| break; |
| } |
| return err; |
| } |
| |
| static struct atm_ioctl clip_ioctl_ops = { |
| .owner = THIS_MODULE, |
| .ioctl = clip_ioctl, |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| |
| static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) |
| { |
| static int code[] = { 1, 2, 10, 6, 1, 0 }; |
| static int e164[] = { 1, 8, 4, 6, 1, 0 }; |
| |
| if (*addr->sas_addr.pub) { |
| seq_printf(seq, "%s", addr->sas_addr.pub); |
| if (*addr->sas_addr.prv) |
| seq_putc(seq, '+'); |
| } else if (!*addr->sas_addr.prv) { |
| seq_printf(seq, "%s", "(none)"); |
| return; |
| } |
| if (*addr->sas_addr.prv) { |
| unsigned char *prv = addr->sas_addr.prv; |
| int *fields; |
| int i, j; |
| |
| fields = *prv == ATM_AFI_E164 ? e164 : code; |
| for (i = 0; fields[i]; i++) { |
| for (j = fields[i]; j; j--) |
| seq_printf(seq, "%02X", *prv++); |
| if (fields[i + 1]) |
| seq_putc(seq, '.'); |
| } |
| } |
| } |
| |
| /* This means the neighbour entry has no attached VCC objects. */ |
| #define SEQ_NO_VCC_TOKEN ((void *) 2) |
| |
| static void atmarp_info(struct seq_file *seq, struct neighbour *n, |
| struct atmarp_entry *entry, struct clip_vcc *clip_vcc) |
| { |
| struct net_device *dev = n->dev; |
| unsigned long exp; |
| char buf[17]; |
| int svc, llc, off; |
| |
| svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || |
| (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); |
| |
| llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); |
| |
| if (clip_vcc == SEQ_NO_VCC_TOKEN) |
| exp = entry->neigh->used; |
| else |
| exp = clip_vcc->last_use; |
| |
| exp = (jiffies - exp) / HZ; |
| |
| seq_printf(seq, "%-6s%-4s%-4s%5ld ", |
| dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); |
| |
| off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key); |
| while (off < 16) |
| buf[off++] = ' '; |
| buf[off] = '\0'; |
| seq_printf(seq, "%s", buf); |
| |
| if (clip_vcc == SEQ_NO_VCC_TOKEN) { |
| if (time_before(jiffies, entry->expires)) |
| seq_printf(seq, "(resolving)\n"); |
| else |
| seq_printf(seq, "(expired, ref %d)\n", |
| refcount_read(&entry->neigh->refcnt)); |
| } else if (!svc) { |
| seq_printf(seq, "%d.%d.%d\n", |
| clip_vcc->vcc->dev->number, |
| clip_vcc->vcc->vpi, clip_vcc->vcc->vci); |
| } else { |
| svc_addr(seq, &clip_vcc->vcc->remote); |
| seq_putc(seq, '\n'); |
| } |
| } |
| |
| struct clip_seq_state { |
| /* This member must be first. */ |
| struct neigh_seq_state ns; |
| |
| /* Local to clip specific iteration. */ |
| struct clip_vcc *vcc; |
| }; |
| |
| static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, |
| struct clip_vcc *curr) |
| { |
| if (!curr) { |
| curr = e->vccs; |
| if (!curr) |
| return SEQ_NO_VCC_TOKEN; |
| return curr; |
| } |
| if (curr == SEQ_NO_VCC_TOKEN) |
| return NULL; |
| |
| curr = curr->next; |
| |
| return curr; |
| } |
| |
| static void *clip_seq_vcc_walk(struct clip_seq_state *state, |
| struct atmarp_entry *e, loff_t * pos) |
| { |
| struct clip_vcc *vcc = state->vcc; |
| |
| vcc = clip_seq_next_vcc(e, vcc); |
| if (vcc && pos != NULL) { |
| while (*pos) { |
| vcc = clip_seq_next_vcc(e, vcc); |
| if (!vcc) |
| break; |
| --(*pos); |
| } |
| } |
| state->vcc = vcc; |
| |
| return vcc; |
| } |
| |
| static void *clip_seq_sub_iter(struct neigh_seq_state *_state, |
| struct neighbour *n, loff_t * pos) |
| { |
| struct clip_seq_state *state = (struct clip_seq_state *)_state; |
| |
| if (n->dev->type != ARPHRD_ATM) |
| return NULL; |
| |
| return clip_seq_vcc_walk(state, neighbour_priv(n), pos); |
| } |
| |
| static void *clip_seq_start(struct seq_file *seq, loff_t * pos) |
| { |
| struct clip_seq_state *state = seq->private; |
| state->ns.neigh_sub_iter = clip_seq_sub_iter; |
| return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY); |
| } |
| |
| static int clip_seq_show(struct seq_file *seq, void *v) |
| { |
| static char atm_arp_banner[] = |
| "IPitf TypeEncp Idle IP address ATM address\n"; |
| |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, atm_arp_banner); |
| } else { |
| struct clip_seq_state *state = seq->private; |
| struct clip_vcc *vcc = state->vcc; |
| struct neighbour *n = v; |
| |
| atmarp_info(seq, n, neighbour_priv(n), vcc); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations arp_seq_ops = { |
| .start = clip_seq_start, |
| .next = neigh_seq_next, |
| .stop = neigh_seq_stop, |
| .show = clip_seq_show, |
| }; |
| |
| static int arp_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_net(inode, file, &arp_seq_ops, |
| sizeof(struct clip_seq_state)); |
| } |
| |
| static const struct file_operations arp_seq_fops = { |
| .open = arp_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| .owner = THIS_MODULE |
| }; |
| #endif |
| |
| static void atm_clip_exit_noproc(void); |
| |
| static int __init atm_clip_init(void) |
| { |
| register_atm_ioctl(&clip_ioctl_ops); |
| register_netdevice_notifier(&clip_dev_notifier); |
| register_inetaddr_notifier(&clip_inet_notifier); |
| |
| setup_timer(&idle_timer, idle_timer_check, 0); |
| |
| #ifdef CONFIG_PROC_FS |
| { |
| struct proc_dir_entry *p; |
| |
| p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops); |
| if (!p) { |
| pr_err("Unable to initialize /proc/net/atm/arp\n"); |
| atm_clip_exit_noproc(); |
| return -ENOMEM; |
| } |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| static void atm_clip_exit_noproc(void) |
| { |
| struct net_device *dev, *next; |
| |
| unregister_inetaddr_notifier(&clip_inet_notifier); |
| unregister_netdevice_notifier(&clip_dev_notifier); |
| |
| deregister_atm_ioctl(&clip_ioctl_ops); |
| |
| /* First, stop the idle timer, so it stops banging |
| * on the table. |
| */ |
| del_timer_sync(&idle_timer); |
| |
| dev = clip_devs; |
| while (dev) { |
| next = PRIV(dev)->next; |
| unregister_netdev(dev); |
| free_netdev(dev); |
| dev = next; |
| } |
| } |
| |
| static void __exit atm_clip_exit(void) |
| { |
| remove_proc_entry("arp", atm_proc_root); |
| |
| atm_clip_exit_noproc(); |
| } |
| |
| module_init(atm_clip_init); |
| module_exit(atm_clip_exit); |
| MODULE_AUTHOR("Werner Almesberger"); |
| MODULE_DESCRIPTION("Classical/IP over ATM interface"); |
| MODULE_LICENSE("GPL"); |