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