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400 lines
9.6 KiB
400 lines
9.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* net/atm/proc.c - ATM /proc interface |
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* |
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* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA |
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* |
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* seq_file api usage by [email protected] |
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* |
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* Evaluating the efficiency of the whole thing if left as an exercise to |
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* the reader. |
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*/ |
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#include <linux/module.h> /* for EXPORT_SYMBOL */ |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/mm.h> |
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#include <linux/fs.h> |
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#include <linux/stat.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/errno.h> |
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#include <linux/atm.h> |
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#include <linux/atmdev.h> |
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#include <linux/netdevice.h> |
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#include <linux/atmclip.h> |
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#include <linux/init.h> /* for __init */ |
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#include <linux/slab.h> |
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#include <net/net_namespace.h> |
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#include <net/atmclip.h> |
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#include <linux/uaccess.h> |
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#include <linux/param.h> /* for HZ */ |
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#include <linux/atomic.h> |
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#include "resources.h" |
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#include "common.h" /* atm_proc_init prototype */ |
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#include "signaling.h" /* to get sigd - ugly too */ |
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static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, |
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size_t count, loff_t *pos); |
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static const struct proc_ops atm_dev_proc_ops = { |
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.proc_read = proc_dev_atm_read, |
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.proc_lseek = noop_llseek, |
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}; |
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static void add_stats(struct seq_file *seq, const char *aal, |
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const struct k_atm_aal_stats *stats) |
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{ |
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seq_printf(seq, "%s ( %d %d %d %d %d )", aal, |
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atomic_read(&stats->tx), atomic_read(&stats->tx_err), |
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atomic_read(&stats->rx), atomic_read(&stats->rx_err), |
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atomic_read(&stats->rx_drop)); |
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} |
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static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev) |
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{ |
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int i; |
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seq_printf(seq, "%3d %-8s", dev->number, dev->type); |
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for (i = 0; i < ESI_LEN; i++) |
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seq_printf(seq, "%02x", dev->esi[i]); |
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seq_puts(seq, " "); |
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add_stats(seq, "0", &dev->stats.aal0); |
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seq_puts(seq, " "); |
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add_stats(seq, "5", &dev->stats.aal5); |
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seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt)); |
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seq_putc(seq, '\n'); |
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} |
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struct vcc_state { |
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int bucket; |
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struct sock *sk; |
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}; |
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static inline int compare_family(struct sock *sk, int family) |
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{ |
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return !family || (sk->sk_family == family); |
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} |
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static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l) |
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{ |
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struct sock *sk = *sock; |
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if (sk == SEQ_START_TOKEN) { |
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for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) { |
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struct hlist_head *head = &vcc_hash[*bucket]; |
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sk = hlist_empty(head) ? NULL : __sk_head(head); |
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if (sk) |
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break; |
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} |
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l--; |
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} |
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try_again: |
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for (; sk; sk = sk_next(sk)) { |
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l -= compare_family(sk, family); |
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if (l < 0) |
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goto out; |
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} |
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if (!sk && ++*bucket < VCC_HTABLE_SIZE) { |
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sk = sk_head(&vcc_hash[*bucket]); |
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goto try_again; |
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} |
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sk = SEQ_START_TOKEN; |
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out: |
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*sock = sk; |
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return (l < 0); |
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} |
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static inline void *vcc_walk(struct seq_file *seq, loff_t l) |
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{ |
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struct vcc_state *state = seq->private; |
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int family = (uintptr_t)(PDE_DATA(file_inode(seq->file))); |
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return __vcc_walk(&state->sk, family, &state->bucket, l) ? |
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state : NULL; |
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} |
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static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) |
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__acquires(vcc_sklist_lock) |
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{ |
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struct vcc_state *state = seq->private; |
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loff_t left = *pos; |
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read_lock(&vcc_sklist_lock); |
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state->sk = SEQ_START_TOKEN; |
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return left ? vcc_walk(seq, left) : SEQ_START_TOKEN; |
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} |
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static void vcc_seq_stop(struct seq_file *seq, void *v) |
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__releases(vcc_sklist_lock) |
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{ |
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read_unlock(&vcc_sklist_lock); |
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} |
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static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
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{ |
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v = vcc_walk(seq, 1); |
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(*pos)++; |
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return v; |
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} |
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static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) |
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{ |
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static const char *const class_name[] = { |
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"off", "UBR", "CBR", "VBR", "ABR"}; |
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static const char *const aal_name[] = { |
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"---", "1", "2", "3/4", /* 0- 3 */ |
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"???", "5", "???", "???", /* 4- 7 */ |
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"???", "???", "???", "???", /* 8-11 */ |
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"???", "0", "???", "???"}; /* 12-15 */ |
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seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", |
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vcc->dev->number, vcc->vpi, vcc->vci, |
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vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" : |
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aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr, |
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class_name[vcc->qos.rxtp.traffic_class], |
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vcc->qos.txtp.min_pcr, |
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class_name[vcc->qos.txtp.traffic_class]); |
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if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) { |
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struct clip_vcc *clip_vcc = CLIP_VCC(vcc); |
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struct net_device *dev; |
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dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL; |
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seq_printf(seq, "CLIP, Itf:%s, Encap:", |
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dev ? dev->name : "none?"); |
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seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None"); |
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} |
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seq_putc(seq, '\n'); |
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} |
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static const char *vcc_state(struct atm_vcc *vcc) |
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{ |
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static const char *const map[] = { ATM_VS2TXT_MAP }; |
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return map[ATM_VF2VS(vcc->flags)]; |
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} |
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static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) |
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{ |
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struct sock *sk = sk_atm(vcc); |
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seq_printf(seq, "%pK ", vcc); |
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if (!vcc->dev) |
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seq_printf(seq, "Unassigned "); |
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else |
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seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, |
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vcc->vci); |
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switch (sk->sk_family) { |
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case AF_ATMPVC: |
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seq_printf(seq, "PVC"); |
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break; |
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case AF_ATMSVC: |
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seq_printf(seq, "SVC"); |
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break; |
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default: |
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seq_printf(seq, "%3d", sk->sk_family); |
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} |
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seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", |
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vcc->flags, sk->sk_err, |
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sk_wmem_alloc_get(sk), sk->sk_sndbuf, |
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sk_rmem_alloc_get(sk), sk->sk_rcvbuf, |
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refcount_read(&sk->sk_refcnt)); |
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} |
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static void svc_info(struct seq_file *seq, struct atm_vcc *vcc) |
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{ |
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if (!vcc->dev) |
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seq_printf(seq, sizeof(void *) == 4 ? |
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"N/A@%pK%10s" : "N/A@%pK%2s", vcc, ""); |
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else |
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seq_printf(seq, "%3d %3d %5d ", |
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vcc->dev->number, vcc->vpi, vcc->vci); |
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seq_printf(seq, "%-10s ", vcc_state(vcc)); |
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seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub, |
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*vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : ""); |
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if (*vcc->remote.sas_addr.prv) { |
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int i; |
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for (i = 0; i < ATM_ESA_LEN; i++) |
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seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]); |
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} |
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seq_putc(seq, '\n'); |
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} |
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static int atm_dev_seq_show(struct seq_file *seq, void *v) |
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{ |
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static char atm_dev_banner[] = |
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"Itf Type ESI/\"MAC\"addr " |
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"AAL(TX,err,RX,err,drop) ... [refcnt]\n"; |
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if (v == &atm_devs) |
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seq_puts(seq, atm_dev_banner); |
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else { |
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struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); |
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atm_dev_info(seq, dev); |
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} |
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return 0; |
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} |
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static const struct seq_operations atm_dev_seq_ops = { |
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.start = atm_dev_seq_start, |
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.next = atm_dev_seq_next, |
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.stop = atm_dev_seq_stop, |
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.show = atm_dev_seq_show, |
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}; |
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static int pvc_seq_show(struct seq_file *seq, void *v) |
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{ |
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static char atm_pvc_banner[] = |
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"Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; |
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if (v == SEQ_START_TOKEN) |
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seq_puts(seq, atm_pvc_banner); |
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else { |
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struct vcc_state *state = seq->private; |
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struct atm_vcc *vcc = atm_sk(state->sk); |
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pvc_info(seq, vcc); |
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} |
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return 0; |
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} |
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static const struct seq_operations pvc_seq_ops = { |
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.start = vcc_seq_start, |
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.next = vcc_seq_next, |
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.stop = vcc_seq_stop, |
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.show = pvc_seq_show, |
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}; |
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static int vcc_seq_show(struct seq_file *seq, void *v) |
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{ |
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if (v == SEQ_START_TOKEN) { |
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seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", |
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"Address ", "Itf VPI VCI Fam Flags Reply " |
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"Send buffer Recv buffer [refcnt]\n"); |
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} else { |
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struct vcc_state *state = seq->private; |
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struct atm_vcc *vcc = atm_sk(state->sk); |
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vcc_info(seq, vcc); |
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} |
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return 0; |
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} |
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static const struct seq_operations vcc_seq_ops = { |
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.start = vcc_seq_start, |
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.next = vcc_seq_next, |
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.stop = vcc_seq_stop, |
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.show = vcc_seq_show, |
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}; |
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static int svc_seq_show(struct seq_file *seq, void *v) |
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{ |
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static const char atm_svc_banner[] = |
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"Itf VPI VCI State Remote\n"; |
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if (v == SEQ_START_TOKEN) |
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seq_puts(seq, atm_svc_banner); |
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else { |
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struct vcc_state *state = seq->private; |
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struct atm_vcc *vcc = atm_sk(state->sk); |
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svc_info(seq, vcc); |
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} |
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return 0; |
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} |
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static const struct seq_operations svc_seq_ops = { |
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.start = vcc_seq_start, |
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.next = vcc_seq_next, |
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.stop = vcc_seq_stop, |
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.show = svc_seq_show, |
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}; |
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static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, |
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size_t count, loff_t *pos) |
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{ |
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struct atm_dev *dev; |
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unsigned long page; |
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int length; |
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if (count == 0) |
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return 0; |
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page = get_zeroed_page(GFP_KERNEL); |
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if (!page) |
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return -ENOMEM; |
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dev = PDE_DATA(file_inode(file)); |
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if (!dev->ops->proc_read) |
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length = -EINVAL; |
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else { |
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length = dev->ops->proc_read(dev, pos, (char *)page); |
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if (length > count) |
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length = -EINVAL; |
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} |
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if (length >= 0) { |
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if (copy_to_user(buf, (char *)page, length)) |
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length = -EFAULT; |
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(*pos)++; |
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} |
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free_page(page); |
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return length; |
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} |
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struct proc_dir_entry *atm_proc_root; |
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EXPORT_SYMBOL(atm_proc_root); |
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int atm_proc_dev_register(struct atm_dev *dev) |
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{ |
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int error; |
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/* No proc info */ |
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if (!dev->ops->proc_read) |
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return 0; |
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error = -ENOMEM; |
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dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number); |
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if (!dev->proc_name) |
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goto err_out; |
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dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root, |
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&atm_dev_proc_ops, dev); |
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if (!dev->proc_entry) |
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goto err_free_name; |
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return 0; |
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err_free_name: |
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kfree(dev->proc_name); |
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err_out: |
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return error; |
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} |
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void atm_proc_dev_deregister(struct atm_dev *dev) |
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{ |
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if (!dev->ops->proc_read) |
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return; |
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remove_proc_entry(dev->proc_name, atm_proc_root); |
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kfree(dev->proc_name); |
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} |
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int __init atm_proc_init(void) |
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{ |
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atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); |
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if (!atm_proc_root) |
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return -ENOMEM; |
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proc_create_seq("devices", 0444, atm_proc_root, &atm_dev_seq_ops); |
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proc_create_seq_private("pvc", 0444, atm_proc_root, &pvc_seq_ops, |
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sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMPVC); |
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proc_create_seq_private("svc", 0444, atm_proc_root, &svc_seq_ops, |
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sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMSVC); |
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proc_create_seq_private("vc", 0444, atm_proc_root, &vcc_seq_ops, |
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sizeof(struct vcc_state), NULL); |
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return 0; |
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} |
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void atm_proc_exit(void) |
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{ |
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remove_proc_subtree("atm", init_net.proc_net); |
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}
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