cregit-Linux how code gets into the kernel

Release 4.15 net/atm/mpoa_proc.c

Directory: net/atm
// 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/time.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);

/*
 *   Define allowed FILE OPERATIONS
 */

static const struct file_operations mpc_file_operations = {
	.owner =	THIS_MODULE,
	.open =		proc_mpc_open,
	.read =		seq_read,
	.llseek =	seq_lseek,
	.write =	proc_mpc_write,
	.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 ""; }

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Linus Torvalds (pre-git)4397.73%150.00%
Joe Perches12.27%150.00%
Total44100.00%2100.00%

/* * 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 ""; }

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Linus Torvalds (pre-git)3797.37%150.00%
Joe Perches12.63%150.00%
Total38100.00%2100.00%

/* * 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; }

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Al Viro5690.32%150.00%
Linus Torvalds (pre-git)69.68%150.00%
Total62100.00%2100.00%


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; }

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Al Viro3579.55%150.00%
Linus Torvalds (pre-git)920.45%150.00%
Total44100.00%2100.00%


static void mpc_stop(struct seq_file *m, void *v) { }

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Al Viro1392.86%150.00%
Linus Torvalds (pre-git)17.14%150.00%
Total14100.00%2100.00%

/* * 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; struct timeval 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"); do_gettimeofday(&now); for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) { 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 - (now.tv_sec-in_entry->tv.tv_sec), 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; 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 - (now.tv_sec-eg_entry->tv.tv_sec)), 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; }

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Linus Torvalds (pre-git)25869.92%240.00%
Al Viro10027.10%240.00%
Joe Perches112.98%120.00%
Total369100.00%5100.00%

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); }

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Al Viro1976.00%133.33%
Linus Torvalds (pre-git)624.00%266.67%
Total25100.00%3100.00%


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++, len++) { if (get_user(*p, buff++)) { free_page((unsigned long)page); return -EFAULT; } 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; }

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Linus Torvalds (pre-git)12171.60%233.33%
Al Viro4627.22%233.33%
Eric Dumazet10.59%116.67%
Linus Torvalds10.59%116.67%
Total169100.00%6100.00%


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; }

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Linus Torvalds (pre-git)18164.87%120.00%
Al Viro9634.41%240.00%
Masanari Iida10.36%120.00%
Hideaki Yoshifuji / 吉藤英明10.36%120.00%
Total279100.00%5100.00%

/* * 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_file_operations); if (!p) { pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME); return -ENOMEM; } return 0; }

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Linus Torvalds (pre-git)4289.36%250.00%
Wang Chen48.51%125.00%
Joe Perches12.13%125.00%
Total47100.00%4100.00%

/* * DELETING function - called when module is removed. */
void mpc_proc_clean(void) { remove_proc_entry(STAT_FILE_NAME, atm_proc_root); }

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Linus Torvalds (pre-git)14100.00%2100.00%
Total14100.00%2100.00%

#endif /* CONFIG_PROC_FS */

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Linus Torvalds (pre-git)85863.04%625.00%
Al Viro41730.64%416.67%
Joe Perches624.56%312.50%
Hideaki Yoshifuji / 吉藤英明70.51%28.33%
Wang Chen40.29%14.17%
Rusty Russell40.29%14.17%
Tejun Heo30.22%14.17%
Greg Kroah-Hartman10.07%14.17%
Philippe De Muyter10.07%14.17%
Masanari Iida10.07%14.17%
Eric Dumazet10.07%14.17%
Linus Torvalds10.07%14.17%
Arjan van de Ven10.07%14.17%
Total1361100.00%24100.00%
Directory: net/atm
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