nf_flow_table_procfs.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2#include <linux/kernel.h>
 3#include <linux/proc_fs.h>
 4#include <net/netfilter/nf_flow_table.h>
 5
 6static void *nf_flow_table_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 7{
 8	struct net *net = seq_file_net(seq);
 9	int cpu;
10
11	if (*pos == 0)
12		return SEQ_START_TOKEN;
13
14	for (cpu = *pos - 1; cpu < nr_cpu_ids; ++cpu) {
15		if (!cpu_possible(cpu))
16			continue;
17		*pos = cpu + 1;
18		return per_cpu_ptr(net->ft.stat, cpu);
19	}
20
21	return NULL;
22}
23
24static void *nf_flow_table_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
25{
26	struct net *net = seq_file_net(seq);
27	int cpu;
28
29	for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
30		if (!cpu_possible(cpu))
31			continue;
32		*pos = cpu + 1;
33		return per_cpu_ptr(net->ft.stat, cpu);
34	}
35	(*pos)++;
36	return NULL;
37}
38
39static void nf_flow_table_cpu_seq_stop(struct seq_file *seq, void *v)
40{
41}
42
43static int nf_flow_table_cpu_seq_show(struct seq_file *seq, void *v)
44{
45	const struct nf_flow_table_stat *st = v;
46
47	if (v == SEQ_START_TOKEN) {
48		seq_puts(seq, "wq_add   wq_del   wq_stats\n");
49		return 0;
50	}
51
52	seq_printf(seq, "%8d %8d %8d\n",
53		   st->count_wq_add,
54		   st->count_wq_del,
55		   st->count_wq_stats
56		);
57	return 0;
58}
59
60static const struct seq_operations nf_flow_table_cpu_seq_ops = {
61	.start	= nf_flow_table_cpu_seq_start,
62	.next	= nf_flow_table_cpu_seq_next,
63	.stop	= nf_flow_table_cpu_seq_stop,
64	.show	= nf_flow_table_cpu_seq_show,
65};
66
67int nf_flow_table_init_proc(struct net *net)
68{
69	struct proc_dir_entry *pde;
70
71	pde = proc_create_net("nf_flowtable", 0444, net->proc_net_stat,
72			      &nf_flow_table_cpu_seq_ops,
73			      sizeof(struct seq_net_private));
74	return pde ? 0 : -ENOMEM;
75}
76
77void nf_flow_table_fini_proc(struct net *net)
78{
79	remove_proc_entry("nf_flowtable", net->proc_net_stat);
80}