l2tp_debugfs.rar_l2tp

/* * L2TP subsystem debugfs * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/module.h> #include <linux/skbuff.h> #include <linux/socket.h> #include <linux/hash.h> #include <linux/l2tp.h> #include <linux/in.h> #include <linux/etherdevice.h> #include <linux/spinlock.h> #include <linux/debugfs.h> #include <net/sock.h> #include <net/ip.h> #include <net/icmp.h> #include <net/udp.h> #include <net/inet_common.h> #include <net/inet_hashtables.h> #include <net/tcp_states.h> #include <net/protocol.h> #include <net/xfrm.h> #include <net/net_namespace.h> #include <net/netns/generic.h> #include "l2tp_core.h" static struct dentry *rootdir; static struct dentry *tunnels; struct l2tp_dfs_seq_data { struct net *net; int tunnel_idx; /* current tunnel */ int session_idx; /* index of session within current tunnel */ struct l2tp_tunnel *tunnel; struct l2tp_session *session; /* NULL means get next tunnel */ }; static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd) { pd->tunnel = l2tp_tunnel_find_nth(pd->net, pd->tunnel_idx); pd->tunnel_idx++; } static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd) { pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx); pd->session_idx++; if (pd->session == NULL) { pd->session_idx = 0; l2tp_dfs_next_tunnel(pd); } } static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs) { struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN; loff_t pos = *offs; if (!pos) goto out; BUG_ON(m->private == NULL); pd = m->private; if (pd->tunnel == NULL) l2tp_dfs_next_tunnel(pd); else l2tp_dfs_next_session(pd); /* NULL tunnel and session indicates end of list */ if ((pd->tunnel == NULL) && (pd->session == NULL)) pd = NULL; out: return pd; } static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos) { (*pos)++; return NULL; } static void l2tp_dfs_seq_stop(struct seq_file *p, void *v) { /* nothing to do */ } static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v) { struct l2tp_tunnel *tunnel = v; int session_count = 0; int hash; struct hlist_node *walk; struct hlist_node *tmp; read_lock_bh(&tunnel->hlist_lock); for (hash = 0; hash < L2TP_HASH_SIZE; hash++) { hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) { struct l2tp_session *session; session = hlist_entry(walk, struct l2tp_session, hlist); if (session->session_id == 0) continue; session_count++; } } read_unlock_bh(&tunnel->hlist_lock); seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id); if (tunnel->sock) { struct inet_sock *inet = inet_sk(tunnel->sock); seq_printf(m, " from %pI4 to %pI4\n", &inet->inet_saddr, &inet->inet_daddr); if (tunnel->encap == L2TP_ENCAPTYPE_UDP) seq_printf(m, " source port %hu, dest port %hu\n", ntohs(inet->inet_sport), ntohs(inet->inet_dport)); } seq_printf(m, " L2TPv%d, %s\n", tunnel->version, tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" : tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" : ""); seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count, tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0, atomic_read(&tunnel->ref_count)); seq_printf(m, " %08x rx %llu/%llu/%llu rx %llu/%llu/%llu\n", tunnel->debug, (unsigned long long)tunnel->stats.tx_packets, (unsigned long long)tunnel->stats.tx_bytes, (unsigned long long)tunnel->stats.tx_errors, (unsigned long long)tunnel->stats.rx_packets, (unsigned long long)tunnel->stats.rx_bytes, (unsigned long long)tunnel->stats.rx_errors); if (tunnel->show != NULL) tunnel->show(m, tunnel); } static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v) { struct l2tp_session *session = v; seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id, session->peer_session_id, session->pwtype == L2TP_PWTYPE_ETH ? "ETH" : session->pwtype == L2TP_PWTYPE_PPP ? "PPP" : ""); if (session->send_seq || session->recv_seq) seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns); seq_printf(m, " refcnt %d\n", atomic_read(&session->ref_count)); seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n", session->mtu, session->mru, session->recv_seq ? 'R' : '-', session->send_seq ? 'S' : '-', session->data_seq == 1 ? "IPSEQ" : session->data_seq == 2 ? "DATASEQ" : "-", session->lns_mode ? "LNS" : "LAC", session->debug, jiffies_to_msecs(session->reorder_timeout)); seq_printf(m, " offset %hu l2specific %hu/%hu\n", session->offset, session->l2specific_type, session->l2specific_len); if (session->cookie_len) { seq_printf(m, " cookie %02x%02x%02x%02x", session->cookie[0], session->cookie[1], session->cookie[2], session->cookie[3]); if (session->cookie_len == 8) seq_printf(m, "%02x%02x%02x%02x", session->cookie[4], session->cookie[5], session->cookie[6], session->cookie[7]); seq_printf(m, "\n"); } if (session->peer_cookie_len) { seq_printf(m, " peer cookie %02x%02x%02x%02x", session->peer_cookie[0], session->peer_cookie[1], session->peer_cookie[2], session->peer_cookie[3]); if (session->peer_cookie_len == 8) seq_printf(m, "%02x%02x%02x%02x", session->peer_cookie[4], session->peer_cookie[5], session->peer_cookie[6], session->peer_cookie[7]); seq_printf(m, "\n"); } seq_printf(m, " %hu/%hu tx %llu/%llu/%llu rx %llu/%llu/%llu\n", session->nr, session->ns, (unsigned long long)session->stats.tx_packets, (unsigned long long)session->stats.tx_bytes, (unsigned long long)session->stats.tx_errors, (unsigned long long)session->stats.rx_packets, (unsigned long long)session->stats.rx_bytes, (unsigned long long)session->stats.rx_errors); if (session->show != NULL) session->show(m, session); } static int l2tp_dfs_seq_show(struct seq_file *m, void *v) { struct l2tp_dfs_seq_data *pd = v; /* display header on line 1 */ if (v == SEQ_START_TOKEN) { seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n"); seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n"); seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n"); seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); seq_puts(m, " SESSION ID, peer ID, PWTYPE\n"); seq_puts(m, " refcnt cnt\n"); seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n"); seq_puts(m, " [ cookie ]\n"); seq_puts(m, " [ peer cookie ]\n"); seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n"); seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); goto out; } /* Show the tunnel or session context */ if (pd->session == NULL) l2tp_dfs_seq_tunnel_show(m, pd->tunnel); else l2tp_dfs_seq_session_show(m, pd->session); out: return 0; } static const struct seq_operations l2tp_dfs_seq_ops = { .start = l2tp_dfs_seq_start, .next = l2tp_dfs_seq_next, .stop = l2tp_dfs_seq_stop, .show = l2tp_dfs_seq_show, }; static int l2tp_dfs_seq_open(struct inode *inode, struct file *file) { struct l2tp_dfs_seq_data *pd; struct seq_file *seq; int rc = -ENOMEM; pd = kzalloc(sizeof(*pd), GFP_KERNEL); if (pd == NULL) goto out; /* Derive the network namespace from the pid opening the * file. */ pd->net = get_net_ns_by_pid(current->pid); if (IS_ERR(pd->net)) { rc = PTR_ERR(pd->net); goto err_free_pd; } rc = seq_open(file, &l2tp_dfs_seq_ops); if (rc) goto err_free_net; seq = file->private_data; seq->private = pd; out: return rc; err_free_net: put_net(pd->net); err_free_pd: kfree(pd); goto out; } static int l2tp_dfs_seq_release(struct inode *inode, struct file *file) { struct l2tp_dfs_seq_data *pd; struct seq_file *seq; seq = file->private_data; pd = seq->private;