From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 14BB1250C07; Wed, 5 Mar 2025 17:55:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741197344; cv=none; b=DBrccJtAygwpCmm1L/ThYLa0jzxwRZtCJAIjWpjvlKyOS7bAqRCzRCpaWx+Gq5NcXGMJD3PPrT6LKWF6JhsghpwdP4ZcK4IBteQ/iVtIPru2tBK5PHGPP/yt/qV/I070mAhgOwM1rwfAFIAV0kuFI8JIH2hz5depe2J6a0SEQgk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741197344; c=relaxed/simple; bh=PjA5dVl/TgqzKXWBF5zB65EBYXyVDChjPM0Req7NMsk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HdT7rRNMecxpWt6JsTHKjuUbPIWODl/CWWurBSYP+QtBHj7jLj+eRwc6otD1WZ2ceozghnXHuetru4gODOTIy7GbpTzFmyt2ElFLVAjfy7cuQWG/hlxUREKalPhGlU8mdTJ4QqRYVTw+TlP6uSGEgCHF7oYCJ+I84gX5h8kjht8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=TEARTYrt; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="TEARTYrt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 928CFC4CED1; Wed, 5 Mar 2025 17:55:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741197343; bh=PjA5dVl/TgqzKXWBF5zB65EBYXyVDChjPM0Req7NMsk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TEARTYrtaODUFTUM2IGZs7MsQEsQArb/0+DHsZHMJkig0Xa4wnlHj2nNQn3dxCKfu GMjU5lb4g1jiYlMJ36Hg16Ayx/AX5HKmvwc/hzxtlHWnmDPt3+XsiYueEmYH8OIMfO 5lzOU3X7krvAPswtSMp9bNRt6kh/7FF+hId94GGA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Peilin He , xu xin , Yunkai Zhang , Yang Yang , Liu Chun , Xuexin Jiang , "Steven Rostedt (Google)" , "David S. Miller" , Sasha Levin Subject: [PATCH 6.1 123/176] net/ipv4: add tracepoint for icmp_send Date: Wed, 5 Mar 2025 18:48:12 +0100 Message-ID: <20250305174510.392345019@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250305174505.437358097@linuxfoundation.org> References: <20250305174505.437358097@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peilin He [ Upstream commit db3efdcf70c752e8a8deb16071d8e693c3ef8746 ] 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 Signed-off-by: xu xin Reviewed-by: Yunkai Zhang Cc: Yang Yang Cc: Liu Chun Cc: Xuexin Jiang Reviewed-by: Steven Rostedt (Google) Signed-off-by: David S. Miller Stable-dep-of: 27843ce6ba3d ("ipvlan: ensure network headers are in skb linear part") Signed-off-by: Sasha Levin --- include/trace/events/icmp.h | 67 +++++++++++++++++++++++++++++++++++++ net/ipv4/icmp.c | 4 +++ 2 files changed, 71 insertions(+) create mode 100644 include/trace/events/icmp.h diff --git a/include/trace/events/icmp.h b/include/trace/events/icmp.h new file mode 100644 index 0000000000000..31559796949a7 --- /dev/null +++ b/include/trace/events/icmp.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM icmp + +#if !defined(_TRACE_ICMP_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_ICMP_H + +#include +#include + +TRACE_EVENT(icmp_send, + + TP_PROTO(const struct sk_buff *skb, int type, int code), + + TP_ARGS(skb, type, code), + + TP_STRUCT__entry( + __field(const void *, skbaddr) + __field(int, type) + __field(int, code) + __array(__u8, saddr, 4) + __array(__u8, daddr, 4) + __field(__u16, sport) + __field(__u16, dport) + __field(unsigned short, ulen) + ), + + TP_fast_assign( + struct iphdr *iph = ip_hdr(skb); + struct udphdr *uh = udp_hdr(skb); + int proto_4 = iph->protocol; + __be32 *p32; + + __entry->skbaddr = skb; + __entry->type = type; + __entry->code = code; + + if (proto_4 != IPPROTO_UDP || (u8 *)uh < skb->head || + (u8 *)uh + sizeof(struct udphdr) + > skb_tail_pointer(skb)) { + __entry->sport = 0; + __entry->dport = 0; + __entry->ulen = 0; + } else { + __entry->sport = ntohs(uh->source); + __entry->dport = ntohs(uh->dest); + __entry->ulen = ntohs(uh->len); + } + + p32 = (__be32 *) __entry->saddr; + *p32 = iph->saddr; + + p32 = (__be32 *) __entry->daddr; + *p32 = iph->daddr; + ), + + TP_printk("icmp_send: type=%d, code=%d. From %pI4:%u to %pI4:%u ulen=%d skbaddr=%p", + __entry->type, __entry->code, + __entry->saddr, __entry->sport, __entry->daddr, + __entry->dport, __entry->ulen, __entry->skbaddr) +); + +#endif /* _TRACE_ICMP_H */ + +/* This part must be outside protection */ +#include + diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index a21d32b3ae6c3..b05fa424ad5ce 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -93,6 +93,8 @@ #include #include #include +#define CREATE_TRACE_POINTS +#include /* * Build xmit assembly blocks @@ -778,6 +780,8 @@ void __icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info, if (!fl4.saddr) fl4.saddr = htonl(INADDR_DUMMY); + trace_icmp_send(skb_in, type, code); + icmp_push_reply(sk, &icmp_param, &fl4, &ipc, &rt); ende: ip_rt_put(rt); -- 2.39.5