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350 lines
8.9 KiB
350 lines
8.9 KiB
// 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 <[email protected]>"); |
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MODULE_DESCRIPTION("L2TP debugfs driver"); |
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MODULE_VERSION("1.0");
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