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3adcfa4478
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. Also, there is no need to store the individual debugfs file name, just remove the whole directory all at once, saving a local variable. Cc: "David S. Miller" <davem@davemloft.net> Cc: Guillaume Nault <g.nault@alphalink.fr> Cc: netdev@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
349 lines
9.0 KiB
C
349 lines
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* L2TP subsystem debugfs
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*
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* Copyright (c) 2010 Katalix Systems Ltd
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/socket.h>
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#include <linux/hash.h>
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#include <linux/l2tp.h>
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#include <linux/in.h>
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#include <linux/etherdevice.h>
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#include <linux/spinlock.h>
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#include <linux/debugfs.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/inet_common.h>
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#include <net/inet_hashtables.h>
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#include <net/tcp_states.h>
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#include <net/protocol.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include "l2tp_core.h"
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static struct dentry *rootdir;
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struct l2tp_dfs_seq_data {
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struct net *net;
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int tunnel_idx; /* current tunnel */
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int session_idx; /* index of session within current tunnel */
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struct l2tp_tunnel *tunnel;
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struct l2tp_session *session; /* NULL means get next tunnel */
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};
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static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd)
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{
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/* Drop reference taken during previous invocation */
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if (pd->tunnel)
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l2tp_tunnel_dec_refcount(pd->tunnel);
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pd->tunnel = l2tp_tunnel_get_nth(pd->net, pd->tunnel_idx);
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pd->tunnel_idx++;
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}
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static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
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{
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/* Drop reference taken during previous invocation */
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if (pd->session)
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l2tp_session_dec_refcount(pd->session);
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pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
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pd->session_idx++;
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if (pd->session == NULL) {
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pd->session_idx = 0;
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l2tp_dfs_next_tunnel(pd);
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}
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}
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static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
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{
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struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN;
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loff_t pos = *offs;
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if (!pos)
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goto out;
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BUG_ON(m->private == NULL);
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pd = m->private;
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if (pd->tunnel == NULL)
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l2tp_dfs_next_tunnel(pd);
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else
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l2tp_dfs_next_session(pd);
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/* NULL tunnel and session indicates end of list */
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if ((pd->tunnel == NULL) && (pd->session == NULL))
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pd = NULL;
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out:
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return pd;
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}
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static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
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{
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(*pos)++;
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return NULL;
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}
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static void l2tp_dfs_seq_stop(struct seq_file *p, void *v)
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{
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struct l2tp_dfs_seq_data *pd = v;
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if (!pd || pd == SEQ_START_TOKEN)
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return;
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/* Drop reference taken by last invocation of l2tp_dfs_next_session()
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* or l2tp_dfs_next_tunnel().
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*/
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if (pd->session) {
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l2tp_session_dec_refcount(pd->session);
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pd->session = NULL;
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}
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if (pd->tunnel) {
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l2tp_tunnel_dec_refcount(pd->tunnel);
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pd->tunnel = NULL;
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}
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}
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static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
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{
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struct l2tp_tunnel *tunnel = v;
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int session_count = 0;
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int hash;
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struct hlist_node *walk;
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struct hlist_node *tmp;
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read_lock_bh(&tunnel->hlist_lock);
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for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
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hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
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struct l2tp_session *session;
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session = hlist_entry(walk, struct l2tp_session, hlist);
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if (session->session_id == 0)
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continue;
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session_count++;
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}
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}
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read_unlock_bh(&tunnel->hlist_lock);
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seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id);
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if (tunnel->sock) {
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struct inet_sock *inet = inet_sk(tunnel->sock);
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#if IS_ENABLED(CONFIG_IPV6)
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if (tunnel->sock->sk_family == AF_INET6) {
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const struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
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seq_printf(m, " from %pI6c to %pI6c\n",
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&np->saddr, &tunnel->sock->sk_v6_daddr);
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} else
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#endif
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seq_printf(m, " from %pI4 to %pI4\n",
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&inet->inet_saddr, &inet->inet_daddr);
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if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
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seq_printf(m, " source port %hu, dest port %hu\n",
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ntohs(inet->inet_sport), ntohs(inet->inet_dport));
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}
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seq_printf(m, " L2TPv%d, %s\n", tunnel->version,
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tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
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tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" :
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"");
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seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count,
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tunnel->sock ? refcount_read(&tunnel->sock->sk_refcnt) : 0,
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refcount_read(&tunnel->ref_count));
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seq_printf(m, " %08x rx %ld/%ld/%ld rx %ld/%ld/%ld\n",
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tunnel->debug,
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atomic_long_read(&tunnel->stats.tx_packets),
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atomic_long_read(&tunnel->stats.tx_bytes),
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atomic_long_read(&tunnel->stats.tx_errors),
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atomic_long_read(&tunnel->stats.rx_packets),
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atomic_long_read(&tunnel->stats.rx_bytes),
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atomic_long_read(&tunnel->stats.rx_errors));
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}
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static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
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{
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struct l2tp_session *session = v;
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seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id,
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session->peer_session_id,
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session->pwtype == L2TP_PWTYPE_ETH ? "ETH" :
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session->pwtype == L2TP_PWTYPE_PPP ? "PPP" :
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"");
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if (session->send_seq || session->recv_seq)
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seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns);
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seq_printf(m, " refcnt %d\n", refcount_read(&session->ref_count));
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seq_printf(m, " config 0/0/%c/%c/-/%s %08x %u\n",
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session->recv_seq ? 'R' : '-',
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session->send_seq ? 'S' : '-',
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session->lns_mode ? "LNS" : "LAC",
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session->debug,
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jiffies_to_msecs(session->reorder_timeout));
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seq_printf(m, " offset 0 l2specific %hu/%hu\n",
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session->l2specific_type, l2tp_get_l2specific_len(session));
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if (session->cookie_len) {
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seq_printf(m, " cookie %02x%02x%02x%02x",
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session->cookie[0], session->cookie[1],
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session->cookie[2], session->cookie[3]);
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if (session->cookie_len == 8)
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seq_printf(m, "%02x%02x%02x%02x",
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session->cookie[4], session->cookie[5],
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session->cookie[6], session->cookie[7]);
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seq_printf(m, "\n");
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}
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if (session->peer_cookie_len) {
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seq_printf(m, " peer cookie %02x%02x%02x%02x",
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session->peer_cookie[0], session->peer_cookie[1],
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session->peer_cookie[2], session->peer_cookie[3]);
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if (session->peer_cookie_len == 8)
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seq_printf(m, "%02x%02x%02x%02x",
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session->peer_cookie[4], session->peer_cookie[5],
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session->peer_cookie[6], session->peer_cookie[7]);
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seq_printf(m, "\n");
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}
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seq_printf(m, " %hu/%hu tx %ld/%ld/%ld rx %ld/%ld/%ld\n",
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session->nr, session->ns,
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atomic_long_read(&session->stats.tx_packets),
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atomic_long_read(&session->stats.tx_bytes),
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atomic_long_read(&session->stats.tx_errors),
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atomic_long_read(&session->stats.rx_packets),
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atomic_long_read(&session->stats.rx_bytes),
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atomic_long_read(&session->stats.rx_errors));
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if (session->show != NULL)
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session->show(m, session);
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}
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static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
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{
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struct l2tp_dfs_seq_data *pd = v;
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/* display header on line 1 */
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if (v == SEQ_START_TOKEN) {
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seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n");
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seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n");
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seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n");
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seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
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seq_puts(m, " SESSION ID, peer ID, PWTYPE\n");
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seq_puts(m, " refcnt cnt\n");
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seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n");
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seq_puts(m, " [ cookie ]\n");
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seq_puts(m, " [ peer cookie ]\n");
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seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
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seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
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goto out;
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}
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if (!pd->session)
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l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
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else
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l2tp_dfs_seq_session_show(m, pd->session);
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out:
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return 0;
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}
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static const struct seq_operations l2tp_dfs_seq_ops = {
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.start = l2tp_dfs_seq_start,
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.next = l2tp_dfs_seq_next,
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.stop = l2tp_dfs_seq_stop,
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.show = l2tp_dfs_seq_show,
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};
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static int l2tp_dfs_seq_open(struct inode *inode, struct file *file)
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{
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struct l2tp_dfs_seq_data *pd;
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struct seq_file *seq;
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int rc = -ENOMEM;
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pd = kzalloc(sizeof(*pd), GFP_KERNEL);
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if (pd == NULL)
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goto out;
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/* Derive the network namespace from the pid opening the
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* file.
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*/
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pd->net = get_net_ns_by_pid(current->pid);
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if (IS_ERR(pd->net)) {
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rc = PTR_ERR(pd->net);
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goto err_free_pd;
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}
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rc = seq_open(file, &l2tp_dfs_seq_ops);
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if (rc)
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goto err_free_net;
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seq = file->private_data;
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seq->private = pd;
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out:
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return rc;
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err_free_net:
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put_net(pd->net);
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err_free_pd:
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kfree(pd);
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goto out;
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}
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static int l2tp_dfs_seq_release(struct inode *inode, struct file *file)
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{
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struct l2tp_dfs_seq_data *pd;
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struct seq_file *seq;
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seq = file->private_data;
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pd = seq->private;
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if (pd->net)
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put_net(pd->net);
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kfree(pd);
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seq_release(inode, file);
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return 0;
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}
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static const struct file_operations l2tp_dfs_fops = {
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.owner = THIS_MODULE,
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.open = l2tp_dfs_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = l2tp_dfs_seq_release,
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};
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static int __init l2tp_debugfs_init(void)
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{
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rootdir = debugfs_create_dir("l2tp", NULL);
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debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
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pr_info("L2TP debugfs support\n");
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return 0;
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}
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static void __exit l2tp_debugfs_exit(void)
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{
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debugfs_remove_recursive(rootdir);
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}
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module_init(l2tp_debugfs_init);
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module_exit(l2tp_debugfs_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
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MODULE_DESCRIPTION("L2TP debugfs driver");
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MODULE_VERSION("1.0");
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