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TOMOYO Linux Cross Reference
Linux/net/atm/mpoa_proc.c

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  1 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  2 
  3 #ifdef CONFIG_PROC_FS
  4 #include <linux/errno.h>
  5 #include <linux/kernel.h>
  6 #include <linux/string.h>
  7 #include <linux/mm.h>
  8 #include <linux/module.h>
  9 #include <linux/proc_fs.h>
 10 #include <linux/time.h>
 11 #include <linux/seq_file.h>
 12 #include <linux/uaccess.h>
 13 #include <linux/atmmpc.h>
 14 #include <linux/atm.h>
 15 #include <linux/gfp.h>
 16 #include "mpc.h"
 17 #include "mpoa_caches.h"
 18 
 19 /*
 20  * mpoa_proc.c: Implementation MPOA client's proc
 21  * file system statistics
 22  */
 23 
 24 #if 1
 25 #define dprintk(format, args...)                                        \
 26         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
 27 #else
 28 #define dprintk(format, args...)                                        \
 29         do { if (0)                                                     \
 30                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
 31         } while (0)
 32 #endif
 33 
 34 #if 0
 35 #define ddprintk(format, args...)                                       \
 36         printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
 37 #else
 38 #define ddprintk(format, args...)                                       \
 39         do { if (0)                                                     \
 40                 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
 41         } while (0)
 42 #endif
 43 
 44 #define STAT_FILE_NAME "mpc"     /* Our statistic file's name */
 45 
 46 extern struct mpoa_client *mpcs;
 47 extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
 48 
 49 static int proc_mpc_open(struct inode *inode, struct file *file);
 50 static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 51                               size_t nbytes, loff_t *ppos);
 52 
 53 static int parse_qos(const char *buff);
 54 
 55 /*
 56  *   Define allowed FILE OPERATIONS
 57  */
 58 static const struct file_operations mpc_file_operations = {
 59         .owner =        THIS_MODULE,
 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         struct timeval 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         do_gettimeofday(&now);
151 
152         for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
153                 sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
154                 seq_printf(m, "%-16s%s%-14lu%-12u",
155                            ip_string,
156                            ingress_state_string(in_entry->entry_state),
157                            in_entry->ctrl_info.holding_time -
158                            (now.tv_sec-in_entry->tv.tv_sec),
159                            in_entry->packets_fwded);
160                 if (in_entry->shortcut)
161                         seq_printf(m, "   %-3d  %-3d",
162                                    in_entry->shortcut->vpi,
163                                    in_entry->shortcut->vci);
164                 seq_printf(m, "\n");
165         }
166 
167         seq_printf(m, "\n");
168         seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");
169         for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
170                 unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
171                 for (i = 0; i < ATM_ESA_LEN; i++)
172                         seq_printf(m, "%02x", p[i]);
173                 seq_printf(m, "\n%-16lu%s%-14lu%-15u",
174                            (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
175                            egress_state_string(eg_entry->entry_state),
176                            (eg_entry->ctrl_info.holding_time -
177                             (now.tv_sec-eg_entry->tv.tv_sec)),
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++, len++) {
223                 if (get_user(*p, buff++)) {
224                         free_page((unsigned long)page);
225                         return -EFAULT;
226                 }
227                 if (*p == '\0' || *p == '\n')
228                         break;
229         }
230 
231         *p = '\0';
232 
233         if (!parse_qos(page))
234                 printk("mpoa: proc_mpc_write: could not parse '%s'\n", page);
235 
236         free_page((unsigned long)page);
237 
238         return len;
239 }
240 
241 static int parse_qos(const char *buff)
242 {
243         /* possible lines look like this
244          * add 130.230.54.142 tx=max_pcr,max_sdu rx=max_pcr,max_sdu
245          */
246         unsigned char ip[4];
247         int tx_pcr, tx_sdu, rx_pcr, rx_sdu;
248         __be32 ipaddr;
249         struct atm_qos qos;
250 
251         memset(&qos, 0, sizeof(struct atm_qos));
252 
253         if (sscanf(buff, "del %hhu.%hhu.%hhu.%hhu",
254                         ip, ip+1, ip+2, ip+3) == 4) {
255                 ipaddr = *(__be32 *)ip;
256                 return atm_mpoa_delete_qos(atm_mpoa_search_qos(ipaddr));
257         }
258 
259         if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=tx",
260                         ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu) == 6) {
261                 rx_pcr = tx_pcr;
262                 rx_sdu = tx_sdu;
263         } else if (sscanf(buff, "add %hhu.%hhu.%hhu.%hhu tx=%d,%d rx=%d,%d",
264                 ip, ip+1, ip+2, ip+3, &tx_pcr, &tx_sdu, &rx_pcr, &rx_sdu) != 8)
265                 return 0;
266 
267         ipaddr = *(__be32 *)ip;
268         qos.txtp.traffic_class = ATM_CBR;
269         qos.txtp.max_pcr = tx_pcr;
270         qos.txtp.max_sdu = tx_sdu;
271         qos.rxtp.traffic_class = ATM_CBR;
272         qos.rxtp.max_pcr = rx_pcr;
273         qos.rxtp.max_sdu = rx_sdu;
274         qos.aal = ATM_AAL5;
275         dprintk("parse_qos(): setting qos paramameters to tx=%d,%d rx=%d,%d\n",
276                 qos.txtp.max_pcr, qos.txtp.max_sdu,
277                 qos.rxtp.max_pcr, qos.rxtp.max_sdu);
278 
279         atm_mpoa_add_qos(ipaddr, &qos);
280         return 1;
281 }
282 
283 /*
284  * INITIALIZATION function - called when module is initialized/loaded.
285  */
286 int mpc_proc_init(void)
287 {
288         struct proc_dir_entry *p;
289 
290         p = proc_create(STAT_FILE_NAME, 0, atm_proc_root, &mpc_file_operations);
291         if (!p) {
292                 pr_err("Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
293                 return -ENOMEM;
294         }
295         return 0;
296 }
297 
298 /*
299  * DELETING function - called when module is removed.
300  */
301 void mpc_proc_clean(void)
302 {
303         remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
304 }
305 
306 #endif /* CONFIG_PROC_FS */
307 
308 
309 
310 
311 
312 
313 

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