1 // SPDX-License-Identifier: GPL-2.0 2 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 3 4 #ifdef CONFIG_PROC_FS 5 #include <linux/errno.h> 6 #include <linux/kernel.h> 7 #include <linux/string.h> 8 #include <linux/mm.h> 9 #include <linux/module.h> 10 #include <linux/proc_fs.h> 11 #include <linux/ktime.h> 12 #include <linux/seq_file.h> 13 #include <linux/uaccess.h> 14 #include <linux/atmmpc.h> 15 #include <linux/atm.h> 16 #include <linux/gfp.h> 17 #include "mpc.h" 18 #include "mpoa_caches.h" 19 20 /* 21 * mpoa_proc.c: Implementation MPOA client's proc 22 * file system statistics 23 */ 24 25 #if 1 26 #define dprintk(format, args...) \ 27 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */ 28 #else 29 #define dprintk(format, args...) \ 30 do { if (0) \ 31 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\ 32 } while (0) 33 #endif 34 35 #if 0 36 #define ddprintk(format, args...) \ 37 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */ 38 #else 39 #define ddprintk(format, args...) \ 40 do { if (0) \ 41 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\ 42 } while (0) 43 #endif 44 45 #define STAT_FILE_NAME "mpc" /* Our statistic file's name */ 46 47 extern struct mpoa_client *mpcs; 48 extern struct proc_dir_entry *atm_proc_root; /* from proc.c. */ 49 50 static int proc_mpc_open(struct inode *inode, struct file *file); 51 static ssize_t proc_mpc_write(struct file *file, const char __user *buff, 52 size_t nbytes, loff_t *ppos); 53 54 static int parse_qos(const char *buff); 55 56 /* 57 * Define allowed FILE OPERATIONS 58 */ 59 static const struct file_operations mpc_file_operations = { 60 .open = proc_mpc_open, 61 .read = seq_read, 62 .llseek = seq_lseek, 63 .write = proc_mpc_write, 64 .release = seq_release, 65 }; 66 67 /* 68 * Returns the state of an ingress cache entry as a string 69 */ 70 static const char *ingress_state_string(int state) 71 { 72 switch (state) { 73 case INGRESS_RESOLVING: 74 return "resolving "; 75 case INGRESS_RESOLVED: 76 return "resolved "; 77 case INGRESS_INVALID: 78 return "invalid "; 79 case INGRESS_REFRESHING: 80 return "refreshing "; 81 } 82 83 return ""; 84 } 85 86 /* 87 * Returns the state of an egress cache entry as a string 88 */ 89 static const char *egress_state_string(int state) 90 { 91 switch (state) { 92 case EGRESS_RESOLVED: 93 return "resolved "; 94 case EGRESS_PURGE: 95 return "purge "; 96 case EGRESS_INVALID: 97 return "invalid "; 98 } 99 100 return ""; 101 } 102 103 /* 104 * FIXME: mpcs (and per-mpc lists) have no locking whatsoever. 105 */ 106 107 static void *mpc_start(struct seq_file *m, loff_t *pos) 108 { 109 loff_t l = *pos; 110 struct mpoa_client *mpc; 111 112 if (!l--) 113 return SEQ_START_TOKEN; 114 for (mpc = mpcs; mpc; mpc = mpc->next) 115 if (!l--) 116 return mpc; 117 return NULL; 118 } 119 120 static void *mpc_next(struct seq_file *m, void *v, loff_t *pos) 121 { 122 struct mpoa_client *p = v; 123 (*pos)++; 124 return v == SEQ_START_TOKEN ? mpcs : p->next; 125 } 126 127 static void mpc_stop(struct seq_file *m, void *v) 128 { 129 } 130 131 /* 132 * READING function - called when the /proc/atm/mpoa file is read from. 133 */ 134 static int mpc_show(struct seq_file *m, void *v) 135 { 136 struct mpoa_client *mpc = v; 137 int i; 138 in_cache_entry *in_entry; 139 eg_cache_entry *eg_entry; 140 time64_t now; 141 unsigned char ip_string[16]; 142 143 if (v == SEQ_START_TOKEN) { 144 atm_mpoa_disp_qos(m); 145 return 0; 146 } 147 148 seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num); 149 seq_printf(m, "Ingress Entries:\nIP address State Holding time Packets fwded VPI VCI\n"); 150 now = ktime_get_seconds(); 151 152 for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) { 153 unsigned long seconds_delta = now - in_entry->time; 154 155 sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip); 156 seq_printf(m, "%-16s%s%-14lu%-12u", 157 ip_string, 158 ingress_state_string(in_entry->entry_state), 159 in_entry->ctrl_info.holding_time - 160 seconds_delta, 161 in_entry->packets_fwded); 162 if (in_entry->shortcut) 163 seq_printf(m, " %-3d %-3d", 164 in_entry->shortcut->vpi, 165 in_entry->shortcut->vci); 166 seq_printf(m, "\n"); 167 } 168 169 seq_printf(m, "\n"); 170 seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id State Holding time Packets recvd Latest IP addr VPI VCI\n"); 171 for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) { 172 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr; 173 unsigned long seconds_delta = now - eg_entry->time; 174 175 for (i = 0; i < ATM_ESA_LEN; i++) 176 seq_printf(m, "%02x", p[i]); 177 seq_printf(m, "\n%-16lu%s%-14lu%-15u", 178 (unsigned long)ntohl(eg_entry->ctrl_info.cache_id), 179 egress_state_string(eg_entry->entry_state), 180 (eg_entry->ctrl_info.holding_time - seconds_delta), 181 eg_entry->packets_rcvd); 182 183 /* latest IP address */ 184 sprintf(ip_string, "%pI4", &eg_entry->latest_ip_addr); 185 seq_printf(m, "%-16s", ip_string); 186 187 if (eg_entry->shortcut) 188 seq_printf(m, " %-3d %-3d", 189 eg_entry->shortcut->vpi, 190 eg_entry->shortcut->vci); 191 seq_printf(m, "\n"); 192 } 193 seq_printf(m, "\n"); 194 return 0; 195 } 196 197 static const struct seq_operations mpc_op = { 198 .start = mpc_start, 199 .next = mpc_next, 200 .stop = mpc_stop, 201 .show = mpc_show 202 }; 203 204 static int proc_mpc_open(struct inode *inode, struct file *file) 205 { 206 return seq_open(file, &mpc_op); 207 } 208 209 static ssize_t proc_mpc_write(struct file *file, const char __user *buff, 210 size_t nbytes, loff_t *ppos) 211 { 212 char *page, *p; 213 unsigned int len; 214 215 if (nbytes == 0) 216 return 0; 217 218 if (nbytes >= PAGE_SIZE) 219 nbytes = PAGE_SIZE-1; 220 221 page = (char *)__get_free_page(GFP_KERNEL); 222 if (!page) 223 return -ENOMEM; 224 225 for (p = page, len = 0; len < nbytes; p++, len++) { 226 if (get_user(*p, buff++)) { 227 free_page((unsigned long)page); 228 return -EFAULT; 229 } 230 if (*p == '\0' || *p == '\n') 231 break; 232 } 233 234 *p = '\0'; 235 236 if (!parse_qos(page)) 237 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page); 238 239 free_page((unsigned long)page); 240 241 return len; 242 } 243 244 static int parse_qos(const char *buff) 245 { 246 /* possible lines look like this 247 * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu 248 */ 249 unsigned char ip[4]; 250 int tx_pcr, tx_sdu, rx_pcr, rx_sdu; 251 __be32 ipaddr; 252 struct atm_qos qos; 253 254 memset(&qos, 0, sizeof(struct atm_qos)); 255 256 if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu", 257 ip, ip+1, ip+2, ip+3) == 4) { 258 ipaddr = *(__be32 *)ip; 259 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr)); 260 } 261 262 if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx", 263 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) { 264 rx_pcr = tx_pcr; 265 rx_sdu = tx_sdu; 266 } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d", 267 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8) 268 return 0; 269 270 ipaddr = *(__be32 *)ip; 271 qos.txtp.traffic_class = ATM_CBR; 272 qos.txtp.max_pcr = tx_pcr; 273 qos.txtp.max_sdu = tx_sdu; 274 qos.rxtp.traffic_class = ATM_CBR; 275 qos.rxtp.max_pcr = rx_pcr; 276 qos.rxtp.max_sdu = rx_sdu; 277 qos.aal = ATM_AAL5; 278 dprintk("parse_qos(): setting qos parameters to tx=%d,%d rx=%d,%d\n", 279 qos.txtp.max_pcr, qos.txtp.max_sdu, 280 qos.rxtp.max_pcr, qos.rxtp.max_sdu); 281 282 atm_mpoa_add_qos(ipaddr, &qos); 283 return 1; 284 } 285 286 /* 287 * INITIALIZATION function - called when module is initialized/loaded. 288 */ 289 int mpc_proc_init(void) 290 { 291 struct proc_dir_entry *p; 292 293 p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations); 294 if (!p) { 295 pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME); 296 return -ENOMEM; 297 } 298 return 0; 299 } 300 301 /* 302 * DELETING function - called when module is removed. 303 */ 304 void mpc_proc_clean(void) 305 { 306 remove_proc_entry(STAT_FILE_NAME, atm_proc_root); 307 } 308 309 #endif /* CONFIG_PROC_FS */ 310