net/atm/mpoa_proc.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
0003
0004 #ifdef CONFIG_PROC_FS
0005 #include <linux/errno.h>
0006 #include <linux/kernel.h>
0007 #include <linux/string.h>
0008 #include <linux/mm.h>
0009 #include <linux/module.h>
0010 #include <linux/proc_fs.h>
0011 #include <linux/ktime.h>
0012 #include <linux/seq_file.h>
0013 #include <linux/uaccess.h>
0014 #include <linux/atmmpc.h>
0015 #include <linux/atm.h>
0016 #include <linux/gfp.h>
0017 #include "mpc.h"
0018 #include "mpoa_caches.h"
0019
0020 /*
0021  * mpoa_proc.c: Implementation MPOA client's proc
0022  * file system statistics
0023  */
0024
0025 #if 1
0026 #define dprintk(format, args...)                    \
0027     printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
0028 #else
0029 #define dprintk(format, args...)                    \
0030     do { if (0)                         \
0031         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
0032     } while (0)
0033 #endif
0034
0035 #if 0
0036 #define ddprintk(format, args...)                   \
0037     printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
0038 #else
0039 #define ddprintk(format, args...)                   \
0040     do { if (0)                         \
0041         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
0042     } while (0)
0043 #endif
0044
0045 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
0046
0047 extern struct mpoa_client *mpcs;
0048 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
0049
0050 static int proc_mpc_open(struct inode *inode, struct file *file);
0051 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
0052                   size_t nbytes, loff_t *ppos);
0053
0054 static int parse_qos(const char *buff);
0055
0056 static const struct proc_ops mpc_proc_ops = {
0057     .proc_open  = proc_mpc_open,
0058     .proc_read  = seq_read,
0059     .proc_lseek = seq_lseek,
0060     .proc_write = proc_mpc_write,
0061     .proc_release   = seq_release,
0062 };
0063
0064 /*
0065  * Returns the state of an ingress cache entry as a string
0066  */
0067 static const char *ingress_state_string(int state)
0068 {
0069     switch (state) {
0070     case INGRESS_RESOLVING:
0071         return "resolving  ";
0072     case INGRESS_RESOLVED:
0073         return "resolved   ";
0074     case INGRESS_INVALID:
0075         return "invalid    ";
0076     case INGRESS_REFRESHING:
0077         return "refreshing ";
0078     }
0079
0080     return "";
0081 }
0082
0083 /*
0084  * Returns the state of an egress cache entry as a string
0085  */
0086 static const char *egress_state_string(int state)
0087 {
0088     switch (state) {
0089     case EGRESS_RESOLVED:
0090         return "resolved   ";
0091     case EGRESS_PURGE:
0092         return "purge      ";
0093     case EGRESS_INVALID:
0094         return "invalid    ";
0095     }
0096
0097     return "";
0098 }
0099
0100 /*
0101  * FIXME: mpcs (and per-mpc lists) have no locking whatsoever.
0102  */
0103
0104 static void *mpc_start(struct seq_file *m, loff_t *pos)
0105 {
0106     loff_t l = *pos;
0107     struct mpoa_client *mpc;
0108
0109     if (!l--)
0110         return SEQ_START_TOKEN;
0111     for (mpc = mpcs; mpc; mpc = mpc->next)
0112         if (!l--)
0113             return mpc;
0114     return NULL;
0115 }
0116
0117 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos)
0118 {
0119     struct mpoa_client *p = v;
0120     (*pos)++;
0121     return v == SEQ_START_TOKEN ? mpcs : p->next;
0122 }
0123
0124 static void mpc_stop(struct seq_file *m, void *v)
0125 {
0126 }
0127
0128 /*
0129  * READING function - called when the /proc/atm/mpoa file is read from.
0130  */
0131 static int mpc_show(struct seq_file *m, void *v)
0132 {
0133     struct mpoa_client *mpc = v;
0134     int i;
0135     in_cache_entry *in_entry;
0136     eg_cache_entry *eg_entry;
0137     time64_t now;
0138     unsigned char ip_string[16];
0139
0140     if (v == SEQ_START_TOKEN) {
0141         atm_mpoa_disp_qos(m);
0142         return 0;
0143     }
0144
0145     seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
0146     seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");
0147     now = ktime_get_seconds();
0148
0149     for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
0150         unsigned long seconds_delta = now - in_entry->time;
0151
0152         sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
0153         seq_printf(m, "%-16s%s%-14lu%-12u",
0154                ip_string,
0155                ingress_state_string(in_entry->entry_state),
0156                in_entry->ctrl_info.holding_time -
0157                seconds_delta,
0158                in_entry->packets_fwded);
0159         if (in_entry->shortcut)
0160             seq_printf(m, "   %-3d  %-3d",
0161                    in_entry->shortcut->vpi,
0162                    in_entry->shortcut->vci);
0163         seq_printf(m, "\n");
0164     }
0165
0166     seq_printf(m, "\n");
0167     seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
0168     for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
0169         unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
0170         unsigned long seconds_delta = now - eg_entry->time;
0171
0172         for (i = 0; i < ATM_ESA_LEN; i++)
0173             seq_printf(m, "%02x", p[i]);
0174         seq_printf(m, "\n%-16lu%s%-14lu%-15u",
0175                (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
0176                egress_state_string(eg_entry->entry_state),
0177                (eg_entry->ctrl_info.holding_time - seconds_delta),
0178                eg_entry->packets_rcvd);
0179
0180         /* latest IP address */
0181         sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr);
0182         seq_printf(m, "%-16s", ip_string);
0183
0184         if (eg_entry->shortcut)
0185             seq_printf(m, " %-3d %-3d",
0186                    eg_entry->shortcut->vpi,
0187                    eg_entry->shortcut->vci);
0188         seq_printf(m, "\n");
0189     }
0190     seq_printf(m, "\n");
0191     return 0;
0192 }
0193
0194 static const struct seq_operations mpc_op = {
0195     .start =    mpc_start,
0196     .next =     mpc_next,
0197     .stop =     mpc_stop,
0198     .show =     mpc_show
0199 };
0200
0201 static int proc_mpc_open(struct inode *inode, struct file *file)
0202 {
0203     return seq_open(file, &mpc_op);
0204 }
0205
0206 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
0207                   size_t nbytes, loff_t *ppos)
0208 {
0209     char *page, *p;
0210     unsigned int len;
0211
0212     if (nbytes == 0)
0213         return 0;
0214
0215     if (nbytes >= PAGE_SIZE)
0216         nbytes = PAGE_SIZE-1;
0217
0218     page = (char *)__get_free_page(GFP_KERNEL);
0219     if (!page)
0220         return -ENOMEM;
0221
0222     for (p = page, len = 0; len < nbytes; p++, len++) {
0223         if (get_user(*p, buff++)) {
0224             free_page((unsigned long)page);
0225             return -EFAULT;
0226         }
0227         if (*p == '\0' || *p == '\n')
0228             break;
0229     }
0230
0231     *p = '\0';
0232
0233     if (!parse_qos(page))
0234         printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
0235
0236     free_page((unsigned long)page);
0237
0238     return len;
0239 }
0240
0241 static int parse_qos(const char *buff)
0242 {
0243     /* possible lines look like this
0244      * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
0245      */
0246     unsigned char ip[4];
0247     int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
0248     __be32 ipaddr;
0249     struct atm_qos qos;
0250
0251     memset(&qos, 0, sizeof(struct atm_qos));
0252
0253     if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
0254             ip, ip+1, ip+2, ip+3) == 4) {
0255         ipaddr = *(__be32 *)ip;
0256         return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
0257     }
0258
0259     if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
0260             ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
0261         rx_pcr = tx_pcr;
0262         rx_sdu = tx_sdu;
0263     } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
0264         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
0265         return 0;
0266
0267     ipaddr = *(__be32 *)ip;
0268     qos.txtp.traffic_class = ATM_CBR;
0269     qos.txtp.max_pcr = tx_pcr;
0270     qos.txtp.max_sdu = tx_sdu;
0271     qos.rxtp.traffic_class = ATM_CBR;
0272     qos.rxtp.max_pcr = rx_pcr;
0273     qos.rxtp.max_sdu = rx_sdu;
0274     qos.aal = ATM_AAL5;
0275     dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n",
0276         qos.txtp.max_pcr, qos.txtp.max_sdu,
0277         qos.rxtp.max_pcr, qos.rxtp.max_sdu);
0278
0279     atm_mpoa_add_qos(ipaddr, &qos);
0280     return 1;
0281 }
0282
0283 /*
0284  * INITIALIZATION function - called when module is initialized/loaded.
0285  */
0286 int mpc_proc_init(void)
0287 {
0288     struct proc_dir_entry *p;
0289
0290     p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_proc_ops);
0291     if (!p) {
0292         pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
0293         return -ENOMEM;
0294     }
0295     return 0;
0296 }
0297
0298 /*
0299  * DELETING function - called when module is removed.
0300  */
0301 void mpc_proc_clean(void)
0302 {
0303     remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
0304 }
0305
0306 #endif /* CONFIG_PROC_FS */