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
46extern struct mpoa_client *mpcs;
47extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
48
49static int proc_mpc_open(struct inode *inode, struct file *file);
50static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
51			      size_t nbytes, loff_t *ppos);
52
53static int parse_qos(const char *buff);
54
55/*
56 *   Define allowed FILE OPERATIONS
57 */
58static 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 */
70static 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 */
89static 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
107static 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
120static 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
127static 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 */
134static 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
194static const struct seq_operations mpc_op = {
195	.start =	mpc_start,
196	.next =		mpc_next,
197	.stop =		mpc_stop,
198	.show =		mpc_show
199};
200
201static int proc_mpc_open(struct inode *inode, struct file *file)
202{
203	return seq_open(file, &mpc_op);
204}
205
206static 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
241static 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 parameters 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 */
286int 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 */
301void mpc_proc_clean(void)
302{
303	remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
304}
305
306#endif /* CONFIG_PROC_FS */
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