1 /*
2  * net/tipc/trace.c: TIPC tracepoints code
3  *
4  * Copyright (c) 2018, Ericsson AB
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the names of the copyright holders nor the names of its
16  *    contributors may be used to endorse or promote products derived from
17  *    this software without specific prior written permission.
18  *
19  * Alternatively, this software may be distributed under the terms of the
20  * GNU General Public License ("GPL") version 2 as published by the Free
21  * Software Foundation.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "ASIS"
24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33  * POSSIBILITY OF SUCH DAMAGE.
34  */
35 
36 #define CREATE_TRACE_POINTS
37 #include "trace.h"
38 
39 /*
40  * socket tuples for filtering in socket traces:
41  * (portid, sock type, name type, name lower, name upper)
42  */
43 unsigned long sysctl_tipc_sk_filter[5] __read_mostly = {0, };
44 
45 /**
46  * tipc_skb_dump - dump TIPC skb data
47  * @skb: skb to be dumped
48  * @more: dump more?
49  *        - false: dump only tipc msg data
50  *        - true: dump kernel-related skb data and tipc cb[] array as well
51  * @buf: returned buffer of dump data in format
52  */
tipc_skb_dump(struct sk_buff * skb,bool more,char * buf)53 int tipc_skb_dump(struct sk_buff *skb, bool more, char *buf)
54 {
55 	int i = 0;
56 	size_t sz = (more) ? SKB_LMAX : SKB_LMIN;
57 	struct tipc_msg *hdr;
58 	struct tipc_skb_cb *skbcb;
59 
60 	if (!skb) {
61 		i += scnprintf(buf, sz, "msg: (null)\n");
62 		return i;
63 	}
64 
65 	hdr = buf_msg(skb);
66 	skbcb = TIPC_SKB_CB(skb);
67 
68 	/* tipc msg data section */
69 	i += scnprintf(buf, sz, "msg: %u", msg_user(hdr));
70 	i += scnprintf(buf + i, sz - i, " %u", msg_type(hdr));
71 	i += scnprintf(buf + i, sz - i, " %u", msg_hdr_sz(hdr));
72 	i += scnprintf(buf + i, sz - i, " %u", msg_data_sz(hdr));
73 	i += scnprintf(buf + i, sz - i, " %x", msg_orignode(hdr));
74 	i += scnprintf(buf + i, sz - i, " %x", msg_destnode(hdr));
75 	i += scnprintf(buf + i, sz - i, " %u", msg_seqno(hdr));
76 	i += scnprintf(buf + i, sz - i, " %u", msg_ack(hdr));
77 	i += scnprintf(buf + i, sz - i, " %u", msg_bcast_ack(hdr));
78 	switch (msg_user(hdr)) {
79 	case LINK_PROTOCOL:
80 		i += scnprintf(buf + i, sz - i, " %c", msg_net_plane(hdr));
81 		i += scnprintf(buf + i, sz - i, " %u", msg_probe(hdr));
82 		i += scnprintf(buf + i, sz - i, " %u", msg_peer_stopping(hdr));
83 		i += scnprintf(buf + i, sz - i, " %u", msg_session(hdr));
84 		i += scnprintf(buf + i, sz - i, " %u", msg_next_sent(hdr));
85 		i += scnprintf(buf + i, sz - i, " %u", msg_seq_gap(hdr));
86 		i += scnprintf(buf + i, sz - i, " %u", msg_bc_snd_nxt(hdr));
87 		i += scnprintf(buf + i, sz - i, " %u", msg_bc_gap(hdr));
88 		break;
89 	case TIPC_LOW_IMPORTANCE:
90 	case TIPC_MEDIUM_IMPORTANCE:
91 	case TIPC_HIGH_IMPORTANCE:
92 	case TIPC_CRITICAL_IMPORTANCE:
93 	case CONN_MANAGER:
94 	case SOCK_WAKEUP:
95 		i += scnprintf(buf + i, sz - i, " | %u", msg_origport(hdr));
96 		i += scnprintf(buf + i, sz - i, " %u", msg_destport(hdr));
97 		switch (msg_type(hdr)) {
98 		case TIPC_NAMED_MSG:
99 			i += scnprintf(buf + i, sz - i, " %u",
100 				       msg_nametype(hdr));
101 			i += scnprintf(buf + i, sz - i, " %u",
102 				       msg_nameinst(hdr));
103 			break;
104 		case TIPC_MCAST_MSG:
105 			i += scnprintf(buf + i, sz - i, " %u",
106 				       msg_nametype(hdr));
107 			i += scnprintf(buf + i, sz - i, " %u",
108 				       msg_namelower(hdr));
109 			i += scnprintf(buf + i, sz - i, " %u",
110 				       msg_nameupper(hdr));
111 			break;
112 		default:
113 			break;
114 		}
115 		i += scnprintf(buf + i, sz - i, " | %u",
116 			       msg_src_droppable(hdr));
117 		i += scnprintf(buf + i, sz - i, " %u",
118 			       msg_dest_droppable(hdr));
119 		i += scnprintf(buf + i, sz - i, " %u", msg_errcode(hdr));
120 		i += scnprintf(buf + i, sz - i, " %u", msg_reroute_cnt(hdr));
121 		break;
122 	default:
123 		/* need more? */
124 		break;
125 	}
126 
127 	i += scnprintf(buf + i, sz - i, "\n");
128 	if (!more)
129 		return i;
130 
131 	/* kernel-related skb data section */
132 	i += scnprintf(buf + i, sz - i, "skb: %s",
133 		       (skb->dev) ? skb->dev->name : "n/a");
134 	i += scnprintf(buf + i, sz - i, " %u", skb->len);
135 	i += scnprintf(buf + i, sz - i, " %u", skb->data_len);
136 	i += scnprintf(buf + i, sz - i, " %u", skb->hdr_len);
137 	i += scnprintf(buf + i, sz - i, " %u", skb->truesize);
138 	i += scnprintf(buf + i, sz - i, " %u", skb_cloned(skb));
139 	i += scnprintf(buf + i, sz - i, " %p", skb->sk);
140 	i += scnprintf(buf + i, sz - i, " %u", skb_shinfo(skb)->nr_frags);
141 	i += scnprintf(buf + i, sz - i, " %llx",
142 		       ktime_to_ms(skb_get_ktime(skb)));
143 	i += scnprintf(buf + i, sz - i, " %llx\n",
144 		       ktime_to_ms(skb_hwtstamps(skb)->hwtstamp));
145 
146 	/* tipc skb cb[] data section */
147 	i += scnprintf(buf + i, sz - i, "cb[]: %u", skbcb->bytes_read);
148 	i += scnprintf(buf + i, sz - i, " %u", skbcb->orig_member);
149 	i += scnprintf(buf + i, sz - i, " %u",
150 		       jiffies_to_msecs(skbcb->nxt_retr));
151 	i += scnprintf(buf + i, sz - i, " %u", skbcb->validated);
152 	i += scnprintf(buf + i, sz - i, " %u", skbcb->chain_imp);
153 	i += scnprintf(buf + i, sz - i, " %u\n", skbcb->ackers);
154 
155 	return i;
156 }
157 
158 /**
159  * tipc_list_dump - dump TIPC skb list/queue
160  * @list: list of skbs to be dumped
161  * @more: dump more?
162  *        - false: dump only the head & tail skbs
163  *        - true: dump the first & last 5 skbs
164  * @buf: returned buffer of dump data in format
165  */
tipc_list_dump(struct sk_buff_head * list,bool more,char * buf)166 int tipc_list_dump(struct sk_buff_head *list, bool more, char *buf)
167 {
168 	int i = 0;
169 	size_t sz = (more) ? LIST_LMAX : LIST_LMIN;
170 	u32 count, len;
171 	struct sk_buff *hskb, *tskb, *skb, *tmp;
172 
173 	if (!list) {
174 		i += scnprintf(buf, sz, "(null)\n");
175 		return i;
176 	}
177 
178 	len = skb_queue_len(list);
179 	i += scnprintf(buf, sz, "len = %d\n", len);
180 
181 	if (!len)
182 		return i;
183 
184 	if (!more) {
185 		hskb = skb_peek(list);
186 		i += scnprintf(buf + i, sz - i, "  head ");
187 		i += tipc_skb_dump(hskb, false, buf + i);
188 		if (len > 1) {
189 			tskb = skb_peek_tail(list);
190 			i += scnprintf(buf + i, sz - i, "  tail ");
191 			i += tipc_skb_dump(tskb, false, buf + i);
192 		}
193 	} else {
194 		count = 0;
195 		skb_queue_walk_safe(list, skb, tmp) {
196 			count++;
197 			if (count == 6)
198 				i += scnprintf(buf + i, sz - i, "  .\n  .\n");
199 			if (count > 5 && count <= len - 5)
200 				continue;
201 			i += scnprintf(buf + i, sz - i, "  #%d ", count);
202 			i += tipc_skb_dump(skb, false, buf + i);
203 		}
204 	}
205 	return i;
206 }
207