mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 11:55:49 +07:00
eee049c0ef
The l2tp subsystem now uses standard kernel logging APIs for informational and warning messages, and tracepoints for debug information. Now that the tunnel and session debug flags are unused, remove the field from the core structures. Various system calls (in the case of l2tp_ppp) and netlink messages handle the getting and setting of debug flags. To avoid userspace breakage don't modify the API of these calls; simply ignore set requests, and send dummy data for get requests. Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
351 lines
8.9 KiB
C
351 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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) {
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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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if (WARN_ON(!m->private)) {
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pd = NULL;
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goto out;
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}
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pd = m->private;
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if (!pd->tunnel)
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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 && !pd->session)
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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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}
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#endif
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if (tunnel->sock->sk_family == AF_INET)
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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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0,
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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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0,
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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_puts(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_puts(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)
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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)
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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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