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![David Woodhouse](/assets/img/avatar_default.png)
ATM accounts for in-flight TX packets in sk_wmem_alloc of the VCC on which they are to be sent. But it doesn't take ownership of those packets from the sock (if any) which originally owned them. They should remain owned by their actual sender until they've left the box. There's a hack in pskb_expand_head() to avoid adjusting skb->truesize for certain skbs, precisely to avoid messing up sk_wmem_alloc accounting. Ideally that hack would cover the ATM use case too, but it doesn't — skbs which aren't owned by any sock, for example PPP control frames, still get their truesize adjusted when the low-level ATM driver adds headroom. This has always been an issue, it seems. The truesize of a packet increases, and sk_wmem_alloc on the VCC goes negative. But this wasn't for normal traffic, only for control frames. So I think we just got away with it, and we probably needed to send 2GiB of LCP echo frames before the misaccounting would ever have caused a problem and caused atm_may_send() to start refusing packets. Commit14afee4b60
("net: convert sock.sk_wmem_alloc from atomic_t to refcount_t") did exactly what it was intended to do, and turned this mostly-theoretical problem into a real one, causing PPPoATM to fail immediately as sk_wmem_alloc underflows and atm_may_send() *immediately* starts refusing to allow new packets. The least intrusive solution to this problem is to stash the value of skb->truesize that was accounted to the VCC, in a new member of the ATM_SKB(skb) structure. Then in atm_pop_raw() subtract precisely that value instead of the then-current value of skb->truesize. Fixes:158f323b98
("net: adjust skb->truesize in pskb_expand_head()") Signed-off-by: David Woodhouse <dwmw2@infradead.org> Tested-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
928 lines
22 KiB
C
928 lines
22 KiB
C
/* 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_gateway)
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daddr = &rt->rt_gateway;
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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;
|
|
}
|
|
|
|
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 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");
|