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9cb252c4c1
As Eric reported, the 'reason' field is not presented when trace the kfree_skb event by perf: $ perf record -e skb:kfree_skb -a sleep 10 $ perf script ip_defrag 14605 [021] 221.614303: skb:kfree_skb: skbaddr=0xffff9d2851242700 protocol=34525 location=0xffffffffa39346b1 reason: The cause seems to be passing kernel address directly to TP_printk(), which is not right. As the enum 'skb_drop_reason' is not exported to user space through TRACE_DEFINE_ENUM(), perf can't get the drop reason string from the 'reason' field, which is a number. Therefore, we introduce the macro DEFINE_DROP_REASON(), which is used to define the trace enum by TRACE_DEFINE_ENUM(). With the help of DEFINE_DROP_REASON(), now we can remove the auto-generate that we introduced in the commitec43908dd5("net: skb: use auto-generation to convert skb drop reason to string"), and define the string array 'drop_reasons'. Hmmmm...now we come back to the situation that have to maintain drop reasons in both enum skb_drop_reason and DEFINE_DROP_REASON. But they are both in dropreason.h, which makes it easier. After this commit, now the format of kfree_skb is like this: $ cat /tracing/events/skb/kfree_skb/format name: kfree_skb ID: 1524 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1; field:void * skbaddr; offset:8; size:8; signed:0; field:void * location; offset:16; size:8; signed:0; field:unsigned short protocol; offset:24; size:2; signed:0; field:enum skb_drop_reason reason; offset:28; size:4; signed:0; print fmt: "skbaddr=%p protocol=%u location=%p reason: %s", REC->skbaddr, REC->protocol, REC->location, __print_symbolic(REC->reason, { 1, "NOT_SPECIFIED" }, { 2, "NO_SOCKET" } ...... Fixes:ec43908dd5("net: skb: use auto-generation to convert skb drop reason to string") Link: https://lore.kernel.org/netdev/CANn89i+bx0ybvE55iMYf5GJM48WwV1HNpdm9Q6t-HaEstqpCSA@mail.gmail.com/ Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Menglong Dong <imagedong@tencent.com> Signed-off-by: David S. Miller <davem@davemloft.net>
324 lines
10 KiB
C
324 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _LINUX_DROPREASON_H
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#define _LINUX_DROPREASON_H
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#define DEFINE_DROP_REASON(FN, FNe) \
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FN(NOT_SPECIFIED) \
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FN(NO_SOCKET) \
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FN(PKT_TOO_SMALL) \
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FN(TCP_CSUM) \
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FN(SOCKET_FILTER) \
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FN(UDP_CSUM) \
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FN(NETFILTER_DROP) \
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FN(OTHERHOST) \
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FN(IP_CSUM) \
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FN(IP_INHDR) \
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FN(IP_RPFILTER) \
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FN(UNICAST_IN_L2_MULTICAST) \
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FN(XFRM_POLICY) \
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FN(IP_NOPROTO) \
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FN(SOCKET_RCVBUFF) \
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FN(PROTO_MEM) \
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FN(TCP_MD5NOTFOUND) \
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FN(TCP_MD5UNEXPECTED) \
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FN(TCP_MD5FAILURE) \
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FN(SOCKET_BACKLOG) \
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FN(TCP_FLAGS) \
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FN(TCP_ZEROWINDOW) \
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FN(TCP_OLD_DATA) \
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FN(TCP_OVERWINDOW) \
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FN(TCP_OFOMERGE) \
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FN(TCP_RFC7323_PAWS) \
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FN(TCP_INVALID_SEQUENCE) \
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FN(TCP_RESET) \
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FN(TCP_INVALID_SYN) \
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FN(TCP_CLOSE) \
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FN(TCP_FASTOPEN) \
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FN(TCP_OLD_ACK) \
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FN(TCP_TOO_OLD_ACK) \
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FN(TCP_ACK_UNSENT_DATA) \
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FN(TCP_OFO_QUEUE_PRUNE) \
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FN(TCP_OFO_DROP) \
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FN(IP_OUTNOROUTES) \
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FN(BPF_CGROUP_EGRESS) \
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FN(IPV6DISABLED) \
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FN(NEIGH_CREATEFAIL) \
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FN(NEIGH_FAILED) \
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FN(NEIGH_QUEUEFULL) \
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FN(NEIGH_DEAD) \
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FN(TC_EGRESS) \
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FN(QDISC_DROP) \
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FN(CPU_BACKLOG) \
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FN(XDP) \
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FN(TC_INGRESS) \
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FN(UNHANDLED_PROTO) \
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FN(SKB_CSUM) \
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FN(SKB_GSO_SEG) \
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FN(SKB_UCOPY_FAULT) \
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FN(DEV_HDR) \
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FN(DEV_READY) \
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FN(FULL_RING) \
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FN(NOMEM) \
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FN(HDR_TRUNC) \
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FN(TAP_FILTER) \
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FN(TAP_TXFILTER) \
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FN(ICMP_CSUM) \
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FN(INVALID_PROTO) \
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FN(IP_INADDRERRORS) \
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FN(IP_INNOROUTES) \
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FN(PKT_TOO_BIG) \
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FNe(MAX)
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/**
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* enum skb_drop_reason - the reasons of skb drops
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*
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* The reason of skb drop, which is used in kfree_skb_reason().
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*/
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enum skb_drop_reason {
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/**
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* @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
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*/
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SKB_NOT_DROPPED_YET = 0,
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/** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
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SKB_DROP_REASON_NOT_SPECIFIED,
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/** @SKB_DROP_REASON_NO_SOCKET: socket not found */
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SKB_DROP_REASON_NO_SOCKET,
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/** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
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SKB_DROP_REASON_PKT_TOO_SMALL,
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/** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
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SKB_DROP_REASON_TCP_CSUM,
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/** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
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SKB_DROP_REASON_SOCKET_FILTER,
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/** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
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SKB_DROP_REASON_UDP_CSUM,
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/** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
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SKB_DROP_REASON_NETFILTER_DROP,
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/**
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* @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
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* (interface is in promisc mode)
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*/
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SKB_DROP_REASON_OTHERHOST,
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/** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
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SKB_DROP_REASON_IP_CSUM,
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/**
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* @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
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* IPSTATS_MIB_INHDRERRORS)
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*/
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SKB_DROP_REASON_IP_INHDR,
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/**
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* @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
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* document for rp_filter in ip-sysctl.rst for more information
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*/
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SKB_DROP_REASON_IP_RPFILTER,
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/**
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* @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
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* multicast, but L3 is unicast.
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*/
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SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
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/** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
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SKB_DROP_REASON_XFRM_POLICY,
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/** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
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SKB_DROP_REASON_IP_NOPROTO,
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/** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
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SKB_DROP_REASON_SOCKET_RCVBUFF,
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/**
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* @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
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* drop out of udp_memory_allocated.
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*/
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SKB_DROP_REASON_PROTO_MEM,
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/**
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* @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
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* corresponding to LINUX_MIB_TCPMD5NOTFOUND
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*/
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SKB_DROP_REASON_TCP_MD5NOTFOUND,
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/**
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* @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
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* one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
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*/
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SKB_DROP_REASON_TCP_MD5UNEXPECTED,
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/**
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* @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
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* to LINUX_MIB_TCPMD5FAILURE
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*/
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SKB_DROP_REASON_TCP_MD5FAILURE,
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/**
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* @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
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* see LINUX_MIB_TCPBACKLOGDROP)
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*/
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SKB_DROP_REASON_SOCKET_BACKLOG,
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/** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
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SKB_DROP_REASON_TCP_FLAGS,
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/**
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* @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
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* see LINUX_MIB_TCPZEROWINDOWDROP
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*/
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SKB_DROP_REASON_TCP_ZEROWINDOW,
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/**
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* @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
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* received before (spurious retrans may happened), see
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* LINUX_MIB_DELAYEDACKLOST
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*/
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SKB_DROP_REASON_TCP_OLD_DATA,
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/**
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* @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
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* the seq of the first byte exceed the right edges of receive
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* window
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*/
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SKB_DROP_REASON_TCP_OVERWINDOW,
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/**
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* @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
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* queue, corresponding to LINUX_MIB_TCPOFOMERGE
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*/
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SKB_DROP_REASON_TCP_OFOMERGE,
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/**
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* @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
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* LINUX_MIB_PAWSESTABREJECTED
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*/
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SKB_DROP_REASON_TCP_RFC7323_PAWS,
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/** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
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SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
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/** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
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SKB_DROP_REASON_TCP_RESET,
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/**
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* @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
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* SYN flag
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*/
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SKB_DROP_REASON_TCP_INVALID_SYN,
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/** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
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SKB_DROP_REASON_TCP_CLOSE,
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/** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
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SKB_DROP_REASON_TCP_FASTOPEN,
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/** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
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SKB_DROP_REASON_TCP_OLD_ACK,
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/** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
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SKB_DROP_REASON_TCP_TOO_OLD_ACK,
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/**
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* @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
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* sent yet
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*/
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SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
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/** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
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SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
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/** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
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SKB_DROP_REASON_TCP_OFO_DROP,
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/** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
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SKB_DROP_REASON_IP_OUTNOROUTES,
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/**
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* @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
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* eBPF program
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*/
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SKB_DROP_REASON_BPF_CGROUP_EGRESS,
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/** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
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SKB_DROP_REASON_IPV6DISABLED,
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/** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
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SKB_DROP_REASON_NEIGH_CREATEFAIL,
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/** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
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SKB_DROP_REASON_NEIGH_FAILED,
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/** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
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SKB_DROP_REASON_NEIGH_QUEUEFULL,
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/** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
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SKB_DROP_REASON_NEIGH_DEAD,
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/** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
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SKB_DROP_REASON_TC_EGRESS,
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/**
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* @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
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* failed to enqueue to current qdisc)
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*/
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SKB_DROP_REASON_QDISC_DROP,
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/**
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* @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
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* backlog queue. This can be caused by backlog queue full (see
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* netdev_max_backlog in net.rst) or RPS flow limit
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*/
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SKB_DROP_REASON_CPU_BACKLOG,
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/** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
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SKB_DROP_REASON_XDP,
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/** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
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SKB_DROP_REASON_TC_INGRESS,
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/** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
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SKB_DROP_REASON_UNHANDLED_PROTO,
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/** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
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SKB_DROP_REASON_SKB_CSUM,
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/** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
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SKB_DROP_REASON_SKB_GSO_SEG,
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/**
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* @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
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* e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
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*/
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SKB_DROP_REASON_SKB_UCOPY_FAULT,
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/** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
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SKB_DROP_REASON_DEV_HDR,
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/**
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* @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
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* any of its data structure that is not up/ready/initialized,
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* e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
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* is not initialized
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*/
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SKB_DROP_REASON_DEV_READY,
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/** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
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SKB_DROP_REASON_FULL_RING,
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/** @SKB_DROP_REASON_NOMEM: error due to OOM */
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SKB_DROP_REASON_NOMEM,
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/**
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* @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
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* networking data, e.g., failed to pull the protocol header from
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* frags via pskb_may_pull()
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*/
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SKB_DROP_REASON_HDR_TRUNC,
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/**
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* @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
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* to tun/tap, e.g., via TUNSETFILTEREBPF
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*/
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SKB_DROP_REASON_TAP_FILTER,
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/**
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* @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
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* tun/tap, e.g., check_filter()
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*/
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SKB_DROP_REASON_TAP_TXFILTER,
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/** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
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SKB_DROP_REASON_ICMP_CSUM,
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/**
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* @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
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* such as a broadcasts ICMP_TIMESTAMP
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*/
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SKB_DROP_REASON_INVALID_PROTO,
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/**
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* @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
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* IPSTATS_MIB_INADDRERRORS
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*/
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SKB_DROP_REASON_IP_INADDRERRORS,
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/**
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* @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
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* IPSTATS_MIB_INADDRERRORS
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*/
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SKB_DROP_REASON_IP_INNOROUTES,
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/**
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* @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
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* MTU)
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*/
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SKB_DROP_REASON_PKT_TOO_BIG,
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/**
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* @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
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* used as a real 'reason'
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*/
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SKB_DROP_REASON_MAX,
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};
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#define SKB_DR_INIT(name, reason) \
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enum skb_drop_reason name = SKB_DROP_REASON_##reason
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#define SKB_DR(name) \
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SKB_DR_INIT(name, NOT_SPECIFIED)
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#define SKB_DR_SET(name, reason) \
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(name = SKB_DROP_REASON_##reason)
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#define SKB_DR_OR(name, reason) \
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do { \
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if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
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name == SKB_NOT_DROPPED_YET) \
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SKB_DR_SET(name, reason); \
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} while (0)
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extern const char * const drop_reasons[];
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#endif
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