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
47extern struct mpoa_client *mpcs;
48extern struct proc_dir_entry *atm_proc_root;  /* from proc.c. */
49
50static int proc_mpc_open(struct inode *inode, struct file *file);
51static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
52			      size_t nbytes, loff_t *ppos);
53
54static int parse_qos(const char *buff);
55
56static 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 */
67static 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 */
86static 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
104static 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
117static 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
124static 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 */
131static 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
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++) {
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
242static 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 */
287int 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 */
302void mpc_proc_clean(void)
303{
304	remove_proc_entry(STAT_FILE_NAME, atm_proc_root);
305}
306
307#endif /* CONFIG_PROC_FS */
308