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Date: Wed, 7 Mar 2007 16:42:59 -0800
From: Stephen Hemminger <shemminger@...ux-foundation.org>
To: netdev@...r.kernel.org
Subject: [RFC] display bound packet types
While debugging I found it useful to see what packet types are in use.
This creates /proc/net/ptype with the format:
Type Device Function
ALL eth0 [ffffffff880b01b6] :af_packet:packet_rcv_spkt+0x0
0800 [ffffffff802330f8] ip_rcv+0x0
0011 [ffffffff881021ef] :llc:llc_rcv+0x0
0004 [ffffffff881021ef] :llc:llc_rcv+0x0
0806 [ffffffff8043de7f] arp_rcv+0x0
86dd [ffffffff880c1b57] :ipv6:ipv6_rcv+0x0
Is it worth the space?
---
net/core/dev.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 131 insertions(+)
--- netem-dev.orig/net/core/dev.c
+++ netem-dev/net/core/dev.c
@@ -2217,6 +2217,132 @@ static const struct file_operations soft
.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 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 [%p]",
+ pt->dev ? pt->dev->name : "",
+ pt->func);
+#ifdef CONFIG_KALLSYMS
+ {
+ unsigned long offset = 0, symsize;
+ const char *symname;
+ char *modname;
+ char *delim = ":";
+ char namebuf[128];
+
+ symname = kallsyms_lookup((unsigned long)pt->func,
+ &symsize, &offset,
+ &modname, namebuf);
+
+ if (symname) {
+ if (!modname)
+ modname = delim = "";
+ seq_printf(seq, " %s%s%s%s+0x%lx",
+ delim, modname, delim,
+ symname, offset);
+ }
+ }
+#endif
+ seq_putc(seq, '\n');
+
+ }
+
+ return 0;
+}
+
+static 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
@@ -2231,6 +2357,9 @@ 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;
@@ -2238,6 +2367,8 @@ out:
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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