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db3efdcf70
Introduce a tracepoint for icmp_send, which can help users to get more
detail information conveniently when icmp abnormal events happen.
1. Giving an usecase example:
=============================
When an application experiences packet loss due to an unreachable UDP
destination port, the kernel will send an exception message through the
icmp_send function. By adding a trace point for icmp_send, developers or
system administrators can obtain detailed information about the UDP
packet loss, including the type, code, source address, destination address,
source port, and destination port. This facilitates the trouble-shooting
of UDP packet loss issues especially for those network-service
applications.
2. Operation Instructions:
==========================
Switch to the tracing directory.
cd /sys/kernel/tracing
Filter for destination port unreachable.
echo "type==3 && code==3" > events/icmp/icmp_send/filter
Enable trace event.
echo 1 > events/icmp/icmp_send/enable
3. Result View:
================
udp_client_erro-11370 [002] ...s.12 124.728002:
icmp_send: icmp_send: type=3, code=3.
From 127.0.0.1:41895 to 127.0.0.1:6666 ulen=23
skbaddr=00000000589b167a
Signed-off-by: Peilin He <he.peilin@zte.com.cn>
Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Reviewed-by: Yunkai Zhang <zhang.yunkai@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: Liu Chun <liu.chun2@zte.com.cn>
Cc: Xuexin Jiang <jiang.xuexin@zte.com.cn>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM icmp
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#if !defined(_TRACE_ICMP_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_ICMP_H
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#include <linux/icmp.h>
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#include <linux/tracepoint.h>
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TRACE_EVENT(icmp_send,
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TP_PROTO(const struct sk_buff *skb, int type, int code),
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TP_ARGS(skb, type, code),
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TP_STRUCT__entry(
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__field(const void *, skbaddr)
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__field(int, type)
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__field(int, code)
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__array(__u8, saddr, 4)
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__array(__u8, daddr, 4)
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__field(__u16, sport)
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__field(__u16, dport)
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__field(unsigned short, ulen)
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),
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TP_fast_assign(
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struct iphdr *iph = ip_hdr(skb);
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struct udphdr *uh = udp_hdr(skb);
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int proto_4 = iph->protocol;
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__be32 *p32;
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__entry->skbaddr = skb;
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__entry->type = type;
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__entry->code = code;
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if (proto_4 != IPPROTO_UDP || (u8 *)uh < skb->head ||
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(u8 *)uh + sizeof(struct udphdr)
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> skb_tail_pointer(skb)) {
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__entry->sport = 0;
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__entry->dport = 0;
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__entry->ulen = 0;
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} else {
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__entry->sport = ntohs(uh->source);
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__entry->dport = ntohs(uh->dest);
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__entry->ulen = ntohs(uh->len);
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}
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p32 = (__be32 *) __entry->saddr;
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*p32 = iph->saddr;
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p32 = (__be32 *) __entry->daddr;
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*p32 = iph->daddr;
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),
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TP_printk("icmp_send: type=%d, code=%d. From %pI4:%u to %pI4:%u ulen=%d skbaddr=%p",
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__entry->type, __entry->code,
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__entry->saddr, __entry->sport, __entry->daddr,
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__entry->dport, __entry->ulen, __entry->skbaddr)
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);
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#endif /* _TRACE_ICMP_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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