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