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09c434b8a0
Add SPDX license identifiers to all files which: - Have no license information of any form - Have MODULE_LICENCE("GPL*") inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
930 lines
22 KiB
C
930 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* net/atm/clip.c - RFC1577 Classical IP over ATM */
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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/kernel.h> /* for UINT_MAX */
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/wait.h>
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#include <linux/timer.h>
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#include <linux/if_arp.h> /* for some manifest constants */
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#include <linux/notifier.h>
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#include <linux/atm.h>
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#include <linux/atmdev.h>
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#include <linux/atmclip.h>
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#include <linux/atmarp.h>
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#include <linux/capability.h>
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#include <linux/ip.h> /* for net/route.h */
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#include <linux/in.h> /* for struct sockaddr_in */
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#include <linux/if.h> /* for IFF_UP */
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#include <linux/inetdevice.h>
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#include <linux/bitops.h>
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#include <linux/poison.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/rcupdate.h>
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#include <linux/jhash.h>
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#include <linux/slab.h>
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#include <net/route.h> /* for struct rtable and routing */
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#include <net/icmp.h> /* icmp_send */
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#include <net/arp.h>
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#include <linux/param.h> /* for HZ */
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#include <linux/uaccess.h>
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#include <asm/byteorder.h> /* for htons etc. */
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#include <linux/atomic.h>
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#include "common.h"
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#include "resources.h"
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#include <net/atmclip.h>
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static struct net_device *clip_devs;
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static struct atm_vcc *atmarpd;
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static struct timer_list idle_timer;
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static const struct neigh_ops clip_neigh_ops;
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static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
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{
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struct sock *sk;
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struct atmarp_ctrl *ctrl;
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struct sk_buff *skb;
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pr_debug("(%d)\n", type);
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if (!atmarpd)
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return -EUNATCH;
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skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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ctrl = skb_put(skb, sizeof(struct atmarp_ctrl));
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ctrl->type = type;
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ctrl->itf_num = itf;
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ctrl->ip = ip;
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atm_force_charge(atmarpd, skb->truesize);
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sk = sk_atm(atmarpd);
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skb_queue_tail(&sk->sk_receive_queue, skb);
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sk->sk_data_ready(sk);
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return 0;
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}
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static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
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{
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pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh);
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clip_vcc->entry = entry;
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clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
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clip_vcc->next = entry->vccs;
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entry->vccs = clip_vcc;
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entry->neigh->used = jiffies;
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}
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static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
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{
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struct atmarp_entry *entry = clip_vcc->entry;
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struct clip_vcc **walk;
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if (!entry) {
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pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
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return;
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}
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netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
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entry->neigh->used = jiffies;
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for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
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if (*walk == clip_vcc) {
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int error;
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*walk = clip_vcc->next; /* atomic */
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clip_vcc->entry = NULL;
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if (clip_vcc->xoff)
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netif_wake_queue(entry->neigh->dev);
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if (entry->vccs)
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goto out;
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entry->expires = jiffies - 1;
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/* force resolution or expiration */
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error = neigh_update(entry->neigh, NULL, NUD_NONE,
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NEIGH_UPDATE_F_ADMIN, 0);
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if (error)
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pr_crit("neigh_update failed with %d\n", error);
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goto out;
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}
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pr_crit("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc);
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out:
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netif_tx_unlock_bh(entry->neigh->dev);
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}
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/* The neighbour entry n->lock is held. */
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static int neigh_check_cb(struct neighbour *n)
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{
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struct atmarp_entry *entry = neighbour_priv(n);
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struct clip_vcc *cv;
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if (n->ops != &clip_neigh_ops)
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return 0;
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for (cv = entry->vccs; cv; cv = cv->next) {
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unsigned long exp = cv->last_use + cv->idle_timeout;
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if (cv->idle_timeout && time_after(jiffies, exp)) {
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pr_debug("releasing vcc %p->%p of entry %p\n",
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cv, cv->vcc, entry);
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vcc_release_async(cv->vcc, -ETIMEDOUT);
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}
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}
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if (entry->vccs || time_before(jiffies, entry->expires))
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return 0;
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if (refcount_read(&n->refcnt) > 1) {
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struct sk_buff *skb;
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pr_debug("destruction postponed with ref %d\n",
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refcount_read(&n->refcnt));
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while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
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dev_kfree_skb(skb);
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return 0;
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}
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pr_debug("expired neigh %p\n", n);
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return 1;
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}
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static void idle_timer_check(struct timer_list *unused)
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{
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write_lock(&arp_tbl.lock);
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__neigh_for_each_release(&arp_tbl, neigh_check_cb);
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mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
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write_unlock(&arp_tbl.lock);
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}
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static int clip_arp_rcv(struct sk_buff *skb)
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{
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struct atm_vcc *vcc;
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pr_debug("\n");
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vcc = ATM_SKB(skb)->vcc;
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if (!vcc || !atm_charge(vcc, skb->truesize)) {
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dev_kfree_skb_any(skb);
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return 0;
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}
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pr_debug("pushing to %p\n", vcc);
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pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
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CLIP_VCC(vcc)->old_push(vcc, skb);
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return 0;
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}
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static const unsigned char llc_oui[] = {
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0xaa, /* DSAP: non-ISO */
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0xaa, /* SSAP: non-ISO */
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0x03, /* Ctrl: Unnumbered Information Command PDU */
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0x00, /* OUI: EtherType */
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0x00,
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0x00
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};
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static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
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pr_debug("\n");
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if (!clip_devs) {
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atm_return(vcc, skb->truesize);
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kfree_skb(skb);
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return;
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}
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if (!skb) {
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pr_debug("removing VCC %p\n", clip_vcc);
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if (clip_vcc->entry)
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unlink_clip_vcc(clip_vcc);
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clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
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kfree(clip_vcc);
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return;
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}
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atm_return(vcc, skb->truesize);
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skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
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/* clip_vcc->entry == NULL if we don't have an IP address yet */
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if (!skb->dev) {
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dev_kfree_skb_any(skb);
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return;
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}
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ATM_SKB(skb)->vcc = vcc;
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skb_reset_mac_header(skb);
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if (!clip_vcc->encap ||
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skb->len < RFC1483LLC_LEN ||
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memcmp(skb->data, llc_oui, sizeof(llc_oui)))
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skb->protocol = htons(ETH_P_IP);
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else {
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skb->protocol = ((__be16 *)skb->data)[3];
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skb_pull(skb, RFC1483LLC_LEN);
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if (skb->protocol == htons(ETH_P_ARP)) {
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skb->dev->stats.rx_packets++;
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skb->dev->stats.rx_bytes += skb->len;
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clip_arp_rcv(skb);
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return;
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}
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}
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clip_vcc->last_use = jiffies;
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skb->dev->stats.rx_packets++;
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skb->dev->stats.rx_bytes += skb->len;
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memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
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netif_rx(skb);
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}
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/*
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* Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
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* clip_pop is atomic with respect to the critical section in clip_start_xmit.
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*/
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static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
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struct net_device *dev = skb->dev;
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int old;
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unsigned long flags;
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pr_debug("(vcc %p)\n", vcc);
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clip_vcc->old_pop(vcc, skb);
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/* skb->dev == NULL in outbound ARP packets */
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if (!dev)
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return;
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spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
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if (atm_may_send(vcc, 0)) {
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old = xchg(&clip_vcc->xoff, 0);
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if (old)
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netif_wake_queue(dev);
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}
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spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
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}
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static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
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{
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__be32 *ip = (__be32 *) neigh->primary_key;
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pr_debug("(neigh %p, skb %p)\n", neigh, skb);
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to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip);
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}
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static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
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{
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#ifndef CONFIG_ATM_CLIP_NO_ICMP
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icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
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#endif
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kfree_skb(skb);
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}
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static const struct neigh_ops clip_neigh_ops = {
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.family = AF_INET,
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.solicit = clip_neigh_solicit,
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.error_report = clip_neigh_error,
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.output = neigh_direct_output,
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.connected_output = neigh_direct_output,
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};
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static int clip_constructor(struct net_device *dev, struct neighbour *neigh)
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{
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struct atmarp_entry *entry = neighbour_priv(neigh);
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if (neigh->tbl->family != AF_INET)
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return -EINVAL;
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if (neigh->type != RTN_UNICAST)
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return -EINVAL;
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neigh->nud_state = NUD_NONE;
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neigh->ops = &clip_neigh_ops;
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neigh->output = neigh->ops->output;
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entry->neigh = neigh;
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entry->vccs = NULL;
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entry->expires = jiffies - 1;
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return 0;
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}
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/* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
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/*
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* We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
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* to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
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* don't increment the usage count. This is used to create entries in
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* clip_setentry.
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*/
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static int clip_encap(struct atm_vcc *vcc, int mode)
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{
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if (!CLIP_VCC(vcc))
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return -EBADFD;
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CLIP_VCC(vcc)->encap = mode;
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return 0;
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}
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static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct clip_priv *clip_priv = PRIV(dev);
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struct dst_entry *dst = skb_dst(skb);
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struct atmarp_entry *entry;
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struct neighbour *n;
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struct atm_vcc *vcc;
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struct rtable *rt;
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__be32 *daddr;
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int old;
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unsigned long flags;
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pr_debug("(skb %p)\n", skb);
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if (!dst) {
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pr_err("skb_dst(skb) == NULL\n");
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dev_kfree_skb(skb);
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dev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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rt = (struct rtable *) dst;
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if (rt->rt_gw_family == AF_INET)
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daddr = &rt->rt_gw4;
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else
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daddr = &ip_hdr(skb)->daddr;
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n = dst_neigh_lookup(dst, daddr);
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if (!n) {
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pr_err("NO NEIGHBOUR !\n");
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dev_kfree_skb(skb);
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dev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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entry = neighbour_priv(n);
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if (!entry->vccs) {
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if (time_after(jiffies, entry->expires)) {
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/* should be resolved */
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entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
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to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key));
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}
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if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
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skb_queue_tail(&entry->neigh->arp_queue, skb);
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else {
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dev_kfree_skb(skb);
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dev->stats.tx_dropped++;
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}
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goto out_release_neigh;
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}
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pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
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ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
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pr_debug("using neighbour %p, vcc %p\n", n, vcc);
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if (entry->vccs->encap) {
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void *here;
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here = skb_push(skb, RFC1483LLC_LEN);
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memcpy(here, llc_oui, sizeof(llc_oui));
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((__be16 *) here)[3] = skb->protocol;
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}
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atm_account_tx(vcc, skb);
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entry->vccs->last_use = jiffies;
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pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
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old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
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if (old) {
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pr_warn("XOFF->XOFF transition\n");
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goto out_release_neigh;
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}
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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vcc->send(vcc, skb);
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if (atm_may_send(vcc, 0)) {
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entry->vccs->xoff = 0;
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goto out_release_neigh;
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}
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spin_lock_irqsave(&clip_priv->xoff_lock, flags);
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netif_stop_queue(dev); /* XOFF -> throttle immediately */
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barrier();
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if (!entry->vccs->xoff)
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netif_start_queue(dev);
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/* Oh, we just raced with clip_pop. netif_start_queue should be
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good enough, because nothing should really be asleep because
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of the brief netif_stop_queue. If this isn't true or if it
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changes, use netif_wake_queue instead. */
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spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
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out_release_neigh:
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neigh_release(n);
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return NETDEV_TX_OK;
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}
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static int clip_mkip(struct atm_vcc *vcc, int timeout)
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{
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struct clip_vcc *clip_vcc;
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if (!vcc->push)
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return -EBADFD;
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clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
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if (!clip_vcc)
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return -ENOMEM;
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pr_debug("%p vcc %p\n", clip_vcc, vcc);
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clip_vcc->vcc = vcc;
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vcc->user_back = clip_vcc;
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set_bit(ATM_VF_IS_CLIP, &vcc->flags);
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clip_vcc->entry = NULL;
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clip_vcc->xoff = 0;
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clip_vcc->encap = 1;
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clip_vcc->last_use = jiffies;
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clip_vcc->idle_timeout = timeout * HZ;
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clip_vcc->old_push = vcc->push;
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clip_vcc->old_pop = vcc->pop;
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vcc->push = clip_push;
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vcc->pop = clip_pop;
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/* re-process everything received between connection setup and MKIP */
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vcc_process_recv_queue(vcc);
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return 0;
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}
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static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
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{
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struct neighbour *neigh;
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struct atmarp_entry *entry;
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int error;
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struct clip_vcc *clip_vcc;
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struct rtable *rt;
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if (vcc->push != clip_push) {
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pr_warn("non-CLIP VCC\n");
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return -EBADF;
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}
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clip_vcc = CLIP_VCC(vcc);
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if (!ip) {
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if (!clip_vcc->entry) {
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pr_err("hiding hidden ATMARP entry\n");
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return 0;
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}
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pr_debug("remove\n");
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unlink_clip_vcc(clip_vcc);
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return 0;
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}
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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 const 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,
|
|
};
|
|
#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);
|
|
|
|
timer_setup(&idle_timer, idle_timer_check, 0);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
p = proc_create_net("arp", 0444, atm_proc_root, &arp_seq_ops,
|
|
sizeof(struct clip_seq_state));
|
|
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");
|