diff options
Diffstat (limited to 'net/atm/mpoa_proc.c')
-rw-r--r-- | net/atm/mpoa_proc.c | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c new file mode 100644 index 0000000000..aaf64b9539 --- /dev/null +++ b/net/atm/mpoa_proc.c @@ -0,0 +1,307 @@ +// SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#ifdef CONFIG_PROC_FS +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/proc_fs.h> +#include <linux/ktime.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include <linux/atmmpc.h> +#include <linux/atm.h> +#include <linux/gfp.h> +#include "mpc.h" +#include "mpoa_caches.h" + +/* + * mpoa_proc.c: Implementation MPOA client's proc + * file system statistics + */ + +#if 1 +#define dprintk(format, args...) \ + printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */ +#else +#define dprintk(format, args...) \ + do { if (0) \ + printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\ + } while (0) +#endif + +#if 0 +#define ddprintk(format, args...) \ + printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */ +#else +#define ddprintk(format, args...) \ + do { if (0) \ + printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\ + } while (0) +#endif + +#define STAT_FILE_NAME "mpc" /* Our statistic file's name */ + +extern struct mpoa_client *mpcs; +extern struct proc_dir_entry *atm_proc_root; /* from proc.c. */ + +static int proc_mpc_open(struct inode *inode, struct file *file); +static ssize_t proc_mpc_write(struct file *file, const char __user *buff, + size_t nbytes, loff_t *ppos); + +static int parse_qos(const char *buff); + +static const struct proc_ops mpc_proc_ops = { + .proc_open = proc_mpc_open, + .proc_read = seq_read, + .proc_lseek = seq_lseek, + .proc_write = proc_mpc_write, + .proc_release = seq_release, +}; + +/* + * Returns the state of an ingress cache entry as a string + */ +static const char *ingress_state_string(int state) +{ + switch (state) { + case INGRESS_RESOLVING: + return "resolving "; + case INGRESS_RESOLVED: + return "resolved "; + case INGRESS_INVALID: + return "invalid "; + case INGRESS_REFRESHING: + return "refreshing "; + } + + return ""; +} + +/* + * Returns the state of an egress cache entry as a string + */ +static const char *egress_state_string(int state) +{ + switch (state) { + case EGRESS_RESOLVED: + return "resolved "; + case EGRESS_PURGE: + return "purge "; + case EGRESS_INVALID: + return "invalid "; + } + + return ""; +} + +/* + * FIXME: mpcs (and per-mpc lists) have no locking whatsoever. + */ + +static void *mpc_start(struct seq_file *m, loff_t *pos) +{ + loff_t l = *pos; + struct mpoa_client *mpc; + + if (!l--) + return SEQ_START_TOKEN; + for (mpc = mpcs; mpc; mpc = mpc->next) + if (!l--) + return mpc; + return NULL; +} + +static void *mpc_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct mpoa_client *p = v; + (*pos)++; + return v == SEQ_START_TOKEN ? mpcs : p->next; +} + +static void mpc_stop(struct seq_file *m, void *v) +{ +} + +/* + * READING function - called when the /proc/atm/mpoa file is read from. + */ +static int mpc_show(struct seq_file *m, void *v) +{ + struct mpoa_client *mpc = v; + int i; + in_cache_entry *in_entry; + eg_cache_entry *eg_entry; + time64_t now; + unsigned char ip_string[16]; + + if (v == SEQ_START_TOKEN) { + atm_mpoa_disp_qos(m); + return 0; + } + + seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num); + seq_printf(m, "Ingress Entries:\nIP address State Holding time Packets fwded VPI VCI\n"); + now = ktime_get_seconds(); + + for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) { + unsigned long seconds_delta = now - in_entry->time; + + sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip); + seq_printf(m, "%-16s%s%-14lu%-12u", + ip_string, + ingress_state_string(in_entry->entry_state), + in_entry->ctrl_info.holding_time - + seconds_delta, + in_entry->packets_fwded); + if (in_entry->shortcut) + seq_printf(m, " %-3d %-3d", + in_entry->shortcut->vpi, + in_entry->shortcut->vci); + seq_printf(m, "\n"); + } + + seq_printf(m, "\n"); + seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id State Holding time Packets recvd Latest IP addr VPI VCI\n"); + for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) { + unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr; + unsigned long seconds_delta = now - eg_entry->time; + + for (i = 0; i < ATM_ESA_LEN; i++) + seq_printf(m, "%02x", p[i]); + seq_printf(m, "\n%-16lu%s%-14lu%-15u", + (unsigned long)ntohl(eg_entry->ctrl_info.cache_id), + egress_state_string(eg_entry->entry_state), + (eg_entry->ctrl_info.holding_time - seconds_delta), + eg_entry->packets_rcvd); + + /* latest IP address */ + sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr); + seq_printf(m, "%-16s", ip_string); + + if (eg_entry->shortcut) + seq_printf(m, " %-3d %-3d", + eg_entry->shortcut->vpi, + eg_entry->shortcut->vci); + seq_printf(m, "\n"); + } + seq_printf(m, "\n"); + return 0; +} + +static const struct seq_operations mpc_op = { + .start = mpc_start, + .next = mpc_next, + .stop = mpc_stop, + .show = mpc_show +}; + +static int proc_mpc_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &mpc_op); +} + +static ssize_t proc_mpc_write(struct file *file, const char __user *buff, + size_t nbytes, loff_t *ppos) +{ + char *page, *p; + unsigned int len; + + if (nbytes == 0) + return 0; + + if (nbytes >= PAGE_SIZE) + nbytes = PAGE_SIZE-1; + + page = (char *)__get_free_page(GFP_KERNEL); + if (!page) + return -ENOMEM; + + for (p = page, len = 0; len < nbytes; p++) { + if (get_user(*p, buff++)) { + free_page((unsigned long)page); + return -EFAULT; + } + len += 1; + if (*p == '\0' || *p == '\n') + break; + } + + *p = '\0'; + + if (!parse_qos(page)) + printk("mpoa: proc_mpc_write: could not parse '%s'\n", page); + + free_page((unsigned long)page); + + return len; +} + +static int parse_qos(const char *buff) +{ + /* possible lines look like this + * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu + */ + unsigned char ip[4]; + int tx_pcr, tx_sdu, rx_pcr, rx_sdu; + __be32 ipaddr; + struct atm_qos qos; + + memset(&qos, 0, sizeof(struct atm_qos)); + + if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu", + ip, ip+1, ip+2, ip+3) == 4) { + ipaddr = *(__be32 *)ip; + return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr)); + } + + if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx", + ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) { + rx_pcr = tx_pcr; + rx_sdu = tx_sdu; + } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d", + ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8) + return 0; + + ipaddr = *(__be32 *)ip; + qos.txtp.traffic_class = ATM_CBR; + qos.txtp.max_pcr = tx_pcr; + qos.txtp.max_sdu = tx_sdu; + qos.rxtp.traffic_class = ATM_CBR; + qos.rxtp.max_pcr = rx_pcr; + qos.rxtp.max_sdu = rx_sdu; + qos.aal = ATM_AAL5; + dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n", + qos.txtp.max_pcr, qos.txtp.max_sdu, + qos.rxtp.max_pcr, qos.rxtp.max_sdu); + + atm_mpoa_add_qos(ipaddr, &qos); + return 1; +} + +/* + * INITIALIZATION function - called when module is initialized/loaded. + */ +int mpc_proc_init(void) +{ + struct proc_dir_entry *p; + + p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_proc_ops); + if (!p) { + pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME); + return -ENOMEM; + } + return 0; +} + +/* + * DELETING function - called when module is removed. + */ +void mpc_proc_clean(void) +{ + remove_proc_entry(STAT_FILE_NAME, atm_proc_root); +} + +#endif /* CONFIG_PROC_FS */ |