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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
1006 lines
24 KiB
C
1006 lines
24 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 <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 <asm/system.h> /* save/restore_flags */
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#include <asm/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 neigh_table clip_tbl;
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static struct timer_list idle_timer;
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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 = (struct atmarp_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, skb->len);
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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);
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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 = NEIGH2ENTRY(n);
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struct clip_vcc *cv;
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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 (atomic_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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atomic_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(unsigned long dummy)
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{
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write_lock(&clip_tbl.lock);
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__neigh_for_each_release(&clip_tbl, neigh_check_cb);
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mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
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write_unlock(&clip_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 (!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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pr_debug("(neigh %p, skb %p)\n", neigh, skb);
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to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->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 = dev_queue_xmit,
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.connected_output = dev_queue_xmit,
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.hh_output = dev_queue_xmit,
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.queue_xmit = dev_queue_xmit,
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};
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static int clip_constructor(struct neighbour *neigh)
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{
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struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
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struct net_device *dev = neigh->dev;
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struct in_device *in_dev;
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struct neigh_parms *parms;
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pr_debug("(neigh %p, entry %p)\n", neigh, entry);
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neigh->type = inet_addr_type(&init_net, entry->ip);
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if (neigh->type != RTN_UNICAST)
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return -EINVAL;
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rcu_read_lock();
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in_dev = __in_dev_get_rcu(dev);
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if (!in_dev) {
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rcu_read_unlock();
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return -EINVAL;
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}
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parms = in_dev->arp_parms;
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__neigh_parms_put(neigh->parms);
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neigh->parms = neigh_parms_clone(parms);
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rcu_read_unlock();
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neigh->ops = &clip_neigh_ops;
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neigh->output = neigh->nud_state & NUD_VALID ?
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neigh->ops->connected_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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static u32 clip_hash(const void *pkey, const struct net_device *dev)
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{
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return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd);
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}
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static struct neigh_table clip_tbl = {
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.family = AF_INET,
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.entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
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.key_len = 4,
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.hash = clip_hash,
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.constructor = clip_constructor,
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.id = "clip_arp_cache",
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/* parameters are copied from ARP ... */
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.parms = {
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.tbl = &clip_tbl,
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.base_reachable_time = 30 * HZ,
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.retrans_time = 1 * HZ,
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.gc_staletime = 60 * HZ,
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.reachable_time = 30 * HZ,
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.delay_probe_time = 5 * HZ,
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.queue_len = 3,
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.ucast_probes = 3,
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.mcast_probes = 3,
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.anycast_delay = 1 * HZ,
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.proxy_delay = (8 * HZ) / 10,
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.proxy_qlen = 64,
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.locktime = 1 * HZ,
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},
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.gc_interval = 30 * HZ,
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.gc_thresh1 = 128,
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.gc_thresh2 = 512,
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.gc_thresh3 = 1024,
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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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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 atmarp_entry *entry;
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struct atm_vcc *vcc;
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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 (!skb_dst(skb)) {
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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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if (!skb_dst(skb)->neighbour) {
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#if 0
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skb_dst(skb)->neighbour = clip_find_neighbour(skb_dst(skb), 1);
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if (!skb_dst(skb)->neighbour) {
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dev_kfree_skb(skb); /* lost that one */
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dev->stats.tx_dropped++;
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return 0;
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}
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#endif
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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 = NEIGH2ENTRY(skb_dst(skb)->neighbour);
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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, entry->ip);
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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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return NETDEV_TX_OK;
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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", skb_dst(skb)->neighbour, 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));
|
|
((__be16 *) here)[3] = skb->protocol;
|
|
}
|
|
atomic_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_warning("XOFF->XOFF transition\n");
|
|
return NETDEV_TX_OK;
|
|
}
|
|
dev->stats.tx_packets++;
|
|
dev->stats.tx_bytes += skb->len;
|
|
vcc->send(vcc, skb);
|
|
if (atm_may_send(vcc, 0)) {
|
|
entry->vccs->xoff = 0;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
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);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static int clip_mkip(struct atm_vcc *vcc, int timeout)
|
|
{
|
|
struct sk_buff_head *rq, queue;
|
|
struct clip_vcc *clip_vcc;
|
|
struct sk_buff *skb, *tmp;
|
|
unsigned long flags;
|
|
|
|
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;
|
|
|
|
__skb_queue_head_init(&queue);
|
|
rq = &sk_atm(vcc)->sk_receive_queue;
|
|
|
|
spin_lock_irqsave(&rq->lock, flags);
|
|
skb_queue_splice_init(rq, &queue);
|
|
spin_unlock_irqrestore(&rq->lock, flags);
|
|
|
|
/* re-process everything received between connection setup and MKIP */
|
|
skb_queue_walk_safe(&queue, skb, tmp) {
|
|
if (!clip_devs) {
|
|
atm_return(vcc, skb->truesize);
|
|
kfree_skb(skb);
|
|
} else {
|
|
struct net_device *dev = skb->dev;
|
|
unsigned int len = skb->len;
|
|
|
|
skb_get(skb);
|
|
clip_push(vcc, skb);
|
|
dev->stats.rx_packets--;
|
|
dev->stats.rx_bytes -= len;
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
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 flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
|
|
struct rtable *rt;
|
|
|
|
if (vcc->push != clip_push) {
|
|
pr_warning("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;
|
|
}
|
|
error = ip_route_output_key(&init_net, &rt, &fl);
|
|
if (error)
|
|
return error;
|
|
neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
|
|
ip_rt_put(rt);
|
|
if (!neigh)
|
|
return -ENOMEM;
|
|
entry = NEIGH2ENTRY(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);
|
|
neigh_release(neigh);
|
|
return error;
|
|
}
|
|
|
|
static const struct net_device_ops clip_netdev_ops = {
|
|
.ndo_start_xmit = clip_start_xmit,
|
|
};
|
|
|
|
static void clip_setup(struct net_device *dev)
|
|
{
|
|
dev->netdev_ops = &clip_netdev_ops;
|
|
dev->type = ARPHRD_ATM;
|
|
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. */
|
|
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
|
|
}
|
|
|
|
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), "", 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 *arg)
|
|
{
|
|
struct net_device *dev = arg;
|
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
return NOTIFY_DONE;
|
|
|
|
if (event == NETDEV_UNREGISTER) {
|
|
neigh_ifdown(&clip_tbl, dev);
|
|
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;
|
|
|
|
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;
|
|
return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
|
|
}
|
|
|
|
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 net_device *dev,
|
|
struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
|
|
{
|
|
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",
|
|
&entry->ip);
|
|
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",
|
|
atomic_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;
|
|
|
|
return clip_seq_vcc_walk(state, NEIGH2ENTRY(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, &clip_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 neighbour *n = v;
|
|
struct clip_vcc *vcc = state->vcc;
|
|
|
|
atmarp_info(seq, n->dev, NEIGH2ENTRY(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)
|
|
{
|
|
neigh_table_init_no_netlink(&clip_tbl);
|
|
|
|
clip_tbl_hook = &clip_tbl;
|
|
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);
|
|
|
|
/* Next, purge the table, so that the device
|
|
* unregister loop below does not hang due to
|
|
* device references remaining in the table.
|
|
*/
|
|
neigh_ifdown(&clip_tbl, NULL);
|
|
|
|
dev = clip_devs;
|
|
while (dev) {
|
|
next = PRIV(dev)->next;
|
|
unregister_netdev(dev);
|
|
free_netdev(dev);
|
|
dev = next;
|
|
}
|
|
|
|
/* Now it is safe to fully shutdown whole table. */
|
|
neigh_table_clear(&clip_tbl);
|
|
|
|
clip_tbl_hook = NULL;
|
|
}
|
|
|
|
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");
|