[NET]: show bound packet types (0e1256ff) · Commits · 戴 / test

net/core/dev.c

+134 −0

Original line number	Diff line number	Diff line
		@@ -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 @@ out:
		return rc;
		out_softnet:
		proc_net_remove("softnet_stat");
		out_dev2:
		proc_net_remove("ptype");
		out_dev:
		proc_net_remove("dev");
		goto out;

Admin message