Commit 0e1256ff authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller

[NET]: show bound packet types

Show what protocols are bound to what packet types in /proc/net/ptype
Uses kallsyms to decode function pointers if possible.
Example:
	Type Device      Function
	ALL  eth1     packet_rcv_spkt+0x0
	0800          ip_rcv+0x0
	0806          arp_rcv+0x0
	86dd          :ipv6:ipv6_rcv+0x0
Signed-off-by: default avatarStephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f690808e
......@@ -2216,6 +2216,135 @@ static const struct file_operations softnet_seq_fops = {
.release = seq_release,
};
static void *ptype_get_idx(loff_t pos)
{
struct packet_type *pt = NULL;
loff_t i = 0;
int t;
list_for_each_entry_rcu(pt, &ptype_all, list) {
if (i == pos)
return pt;
++i;
}
for (t = 0; t < 16; t++) {
list_for_each_entry_rcu(pt, &ptype_base[t], list) {
if (i == pos)
return pt;
++i;
}
}
return NULL;
}
static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
{
rcu_read_lock();
return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
}
static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct packet_type *pt;
struct list_head *nxt;
int hash;
++*pos;
if (v == SEQ_START_TOKEN)
return ptype_get_idx(0);
pt = v;
nxt = pt->list.next;
if (pt->type == htons(ETH_P_ALL)) {
if (nxt != &ptype_all)
goto found;
hash = 0;
nxt = ptype_base[0].next;
} else
hash = ntohs(pt->type) & 15;
while (nxt == &ptype_base[hash]) {
if (++hash >= 16)
return NULL;
nxt = ptype_base[hash].next;
}
found:
return list_entry(nxt, struct packet_type, list);
}
static void ptype_seq_stop(struct seq_file *seq, void *v)
{
rcu_read_unlock();
}
static void ptype_seq_decode(struct seq_file *seq, void *sym)
{
#ifdef CONFIG_KALLSYMS
unsigned long offset = 0, symsize;
const char *symname;
char *modname;
char namebuf[128];
symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
&modname, namebuf);
if (symname) {
char *delim = ":";
if (!modname)
modname = delim = "";
seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
symname, offset);
return;
}
#endif
seq_printf(seq, "[%p]", sym);
}
static int ptype_seq_show(struct seq_file *seq, void *v)
{
struct packet_type *pt = v;
if (v == SEQ_START_TOKEN)
seq_puts(seq, "Type Device Function\n");
else {
if (pt->type == htons(ETH_P_ALL))
seq_puts(seq, "ALL ");
else
seq_printf(seq, "%04x", ntohs(pt->type));
seq_printf(seq, " %-8s ",
pt->dev ? pt->dev->name : "");
ptype_seq_decode(seq, pt->func);
seq_putc(seq, '\n');
}
return 0;
}
static const struct seq_operations ptype_seq_ops = {
.start = ptype_seq_start,
.next = ptype_seq_next,
.stop = ptype_seq_stop,
.show = ptype_seq_show,
};
static int ptype_seq_open(struct inode *inode, struct file *file)
{
return seq_open(file, &ptype_seq_ops);
}
static const struct file_operations ptype_seq_fops = {
.owner = THIS_MODULE,
.open = ptype_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#ifdef CONFIG_WIRELESS_EXT
extern int wireless_proc_init(void);
#else
......@@ -2230,6 +2359,9 @@ static int __init dev_proc_init(void)
goto out;
if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
goto out_dev;
if (!proc_net_fops_create("ptype", S_IRUGO, &ptype_seq_fops))
goto out_dev2;
if (wireless_proc_init())
goto out_softnet;
rc = 0;
......@@ -2237,6 +2369,8 @@ static int __init dev_proc_init(void)
return rc;
out_softnet:
proc_net_remove("softnet_stat");
out_dev2:
proc_net_remove("ptype");
out_dev:
proc_net_remove("dev");
goto out;
......
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