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Merge branch 'reorganize-the-code-of-the-enum-skb_drop_reason' 

Menglong Dong says:

====================
reorganize the code of the enum skb_drop_reason

The code of skb_drop_reason is a little wild, let's reorganize them.
Three things and three patches:

1) Move the enum 'skb_drop_reason' and related function to the standalone
   header 'dropreason.h', as Jakub Kicinski suggested, as the skb drop
   reasons are getting more and more.

2) use auto-generation to generate the source file that convert enum
   skb_drop_reason to string.

3) make the comment of skb drop reasons kernel-doc style.

Changes since v3:
3/3: remove some useless comment (Jakub Kicinski)

Changes since v2:
2/3: - add new line in the end of .gitignore
     - fix awk warning by make '\;' to ';', as ';' is not need to be
       escaped
     - export 'drop_reasons' in skbuff.c

Changes since v1:
1/3: move dropreason.h from include/linux/ to include/net/ (Jakub Kicinski)
2/3: generate source file instead of header file for drop reasons string
     array (Jakub Kicinski)
3/3: use inline comment (Jakub Kicinski)
====================

Link: https://lore.kernel.org/r/20220606022436.331005-1-imagedong@tencent.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Paolo Abeni 2022-06-07 12:51:44 +02:00
parent 12de1ebd2a b160f7270e
commit ba36c5b7ac
7 changed files with 284 additions and 280 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

179
include/linux/skbuff.h
View File

@ -43,6 +43,7 @@
#include <linux/netfilter/nf_conntrack_common.h>
#endif
#include <net/net_debug.h>
#include <net/dropreason.h>
/**
* DOC: skb checksums
@ -337,184 +338,6 @@ struct sk_buff_head {
struct sk_buff;
/* The reason of skb drop, which is used in kfree_skb_reason().
* en...maybe they should be splited by group?
*
* Each item here should also be in 'TRACE_SKB_DROP_REASON', which is
* used to translate the reason to string.
*/
enum skb_drop_reason {
SKB_NOT_DROPPED_YET = 0,
SKB_DROP_REASON_NOT_SPECIFIED, /* drop reason is not specified */
SKB_DROP_REASON_NO_SOCKET, /* socket not found */
SKB_DROP_REASON_PKT_TOO_SMALL, /* packet size is too small */
SKB_DROP_REASON_TCP_CSUM, /* TCP checksum error */
SKB_DROP_REASON_SOCKET_FILTER, /* dropped by socket filter */
SKB_DROP_REASON_UDP_CSUM, /* UDP checksum error */
SKB_DROP_REASON_NETFILTER_DROP, /* dropped by netfilter */
SKB_DROP_REASON_OTHERHOST, /* packet don't belong to current
* host (interface is in promisc
* mode)
*/
SKB_DROP_REASON_IP_CSUM, /* IP checksum error */
SKB_DROP_REASON_IP_INHDR, /* there is something wrong with
* IP header (see
* IPSTATS_MIB_INHDRERRORS)
*/
SKB_DROP_REASON_IP_RPFILTER, /* IP rpfilter validate failed.
* see the document for rp_filter
* in ip-sysctl.rst for more
* information
*/
SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, /* destination address of L2
* is multicast, but L3 is
* unicast.
*/
SKB_DROP_REASON_XFRM_POLICY, /* xfrm policy check failed */
SKB_DROP_REASON_IP_NOPROTO, /* no support for IP protocol */
SKB_DROP_REASON_SOCKET_RCVBUFF, /* socket receive buff is full */
SKB_DROP_REASON_PROTO_MEM, /* proto memory limition, such as
* udp packet drop out of
* udp_memory_allocated.
*/
SKB_DROP_REASON_TCP_MD5NOTFOUND, /* no MD5 hash and one
* expected, corresponding
* to LINUX_MIB_TCPMD5NOTFOUND
*/
SKB_DROP_REASON_TCP_MD5UNEXPECTED, /* MD5 hash and we're not
* expecting one, corresponding
* to LINUX_MIB_TCPMD5UNEXPECTED
*/
SKB_DROP_REASON_TCP_MD5FAILURE, /* MD5 hash and its wrong,
* corresponding to
* LINUX_MIB_TCPMD5FAILURE
*/
SKB_DROP_REASON_SOCKET_BACKLOG, /* failed to add skb to socket
* backlog (see
* LINUX_MIB_TCPBACKLOGDROP)
*/
SKB_DROP_REASON_TCP_FLAGS, /* TCP flags invalid */
SKB_DROP_REASON_TCP_ZEROWINDOW, /* TCP receive window size is zero,
* see LINUX_MIB_TCPZEROWINDOWDROP
*/
SKB_DROP_REASON_TCP_OLD_DATA, /* the TCP data reveived is already
* received before (spurious retrans
* may happened), see
* LINUX_MIB_DELAYEDACKLOST
*/
SKB_DROP_REASON_TCP_OVERWINDOW, /* the TCP data is out of window,
* the seq of the first byte exceed
* the right edges of receive
* window
*/
SKB_DROP_REASON_TCP_OFOMERGE, /* the data of skb is already in
* the ofo queue, corresponding to
* LINUX_MIB_TCPOFOMERGE
*/
SKB_DROP_REASON_TCP_RFC7323_PAWS, /* PAWS check, corresponding to
* LINUX_MIB_PAWSESTABREJECTED
*/
SKB_DROP_REASON_TCP_INVALID_SEQUENCE, /* Not acceptable SEQ field */
SKB_DROP_REASON_TCP_RESET, /* Invalid RST packet */
SKB_DROP_REASON_TCP_INVALID_SYN, /* Incoming packet has unexpected SYN flag */
SKB_DROP_REASON_TCP_CLOSE, /* TCP socket in CLOSE state */
SKB_DROP_REASON_TCP_FASTOPEN, /* dropped by FASTOPEN request socket */
SKB_DROP_REASON_TCP_OLD_ACK, /* TCP ACK is old, but in window */
SKB_DROP_REASON_TCP_TOO_OLD_ACK, /* TCP ACK is too old */
SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, /* TCP ACK for data we haven't sent yet */
SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, /* pruned from TCP OFO queue */
SKB_DROP_REASON_TCP_OFO_DROP, /* data already in receive queue */
SKB_DROP_REASON_IP_OUTNOROUTES, /* route lookup failed */
SKB_DROP_REASON_BPF_CGROUP_EGRESS, /* dropped by
* BPF_PROG_TYPE_CGROUP_SKB
* eBPF program
*/
SKB_DROP_REASON_IPV6DISABLED, /* IPv6 is disabled on the device */
SKB_DROP_REASON_NEIGH_CREATEFAIL, /* failed to create neigh
* entry
*/
SKB_DROP_REASON_NEIGH_FAILED, /* neigh entry in failed state */
SKB_DROP_REASON_NEIGH_QUEUEFULL, /* arp_queue for neigh
* entry is full
*/
SKB_DROP_REASON_NEIGH_DEAD, /* neigh entry is dead */
SKB_DROP_REASON_TC_EGRESS, /* dropped in TC egress HOOK */
SKB_DROP_REASON_QDISC_DROP, /* dropped by qdisc when packet
* outputting (failed to enqueue to
* current qdisc)
*/
SKB_DROP_REASON_CPU_BACKLOG, /* failed to enqueue the skb to
* the per CPU backlog queue. This
* can be caused by backlog queue
* full (see netdev_max_backlog in
* net.rst) or RPS flow limit
*/
SKB_DROP_REASON_XDP, /* dropped by XDP in input path */
SKB_DROP_REASON_TC_INGRESS, /* dropped in TC ingress HOOK */
SKB_DROP_REASON_UNHANDLED_PROTO, /* protocol not implemented
* or not supported
*/
SKB_DROP_REASON_SKB_CSUM, /* sk_buff checksum computation
* error
*/
SKB_DROP_REASON_SKB_GSO_SEG, /* gso segmentation error */
SKB_DROP_REASON_SKB_UCOPY_FAULT, /* failed to copy data from
* user space, e.g., via
* zerocopy_sg_from_iter()
* or skb_orphan_frags_rx()
*/
SKB_DROP_REASON_DEV_HDR, /* device driver specific
* header/metadata is invalid
*/
/* the device is not ready to xmit/recv due to any of its data
* structure that is not up/ready/initialized, e.g., the IFF_UP is
* not set, or driver specific tun->tfiles[txq] is not initialized
*/
SKB_DROP_REASON_DEV_READY,
SKB_DROP_REASON_FULL_RING, /* ring buffer is full */
SKB_DROP_REASON_NOMEM, /* error due to OOM */
SKB_DROP_REASON_HDR_TRUNC, /* failed to trunc/extract the header
* from networking data, e.g., failed
* to pull the protocol header from
* frags via pskb_may_pull()
*/
SKB_DROP_REASON_TAP_FILTER, /* dropped by (ebpf) filter directly
* attached to tun/tap, e.g., via
* TUNSETFILTEREBPF
*/
SKB_DROP_REASON_TAP_TXFILTER, /* dropped by tx filter implemented
* at tun/tap, e.g., check_filter()
*/
SKB_DROP_REASON_ICMP_CSUM, /* ICMP checksum error */
SKB_DROP_REASON_INVALID_PROTO, /* the packet doesn't follow RFC
* 2211, such as a broadcasts
* ICMP_TIMESTAMP
*/
SKB_DROP_REASON_IP_INADDRERRORS, /* host unreachable, corresponding
* to IPSTATS_MIB_INADDRERRORS
*/
SKB_DROP_REASON_IP_INNOROUTES, /* network unreachable, corresponding
* to IPSTATS_MIB_INADDRERRORS
*/
SKB_DROP_REASON_PKT_TOO_BIG, /* packet size is too big (maybe exceed
* the MTU)
*/
SKB_DROP_REASON_MAX,
};
#define SKB_DR_INIT(name, reason) \
enum skb_drop_reason name = SKB_DROP_REASON_##reason
#define SKB_DR(name) \
SKB_DR_INIT(name, NOT_SPECIFIED)
#define SKB_DR_SET(name, reason) \
(name = SKB_DROP_REASON_##reason)
#define SKB_DR_OR(name, reason) \
do { \
if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
name == SKB_NOT_DROPPED_YET) \
SKB_DR_SET(name, reason); \
} while (0)
/* To allow 64K frame to be packed as single skb without frag_list we
* require 64K/PAGE_SIZE pages plus 1 additional page to allow for
* buffers which do not start on a page boundary.

256
include/net/dropreason.h Normal file
View File

@ -0,0 +1,256 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _LINUX_DROPREASON_H
#define _LINUX_DROPREASON_H
/**
* enum skb_drop_reason - the reasons of skb drops
*
* The reason of skb drop, which is used in kfree_skb_reason().
*/
enum skb_drop_reason {
/**
* @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
*/
SKB_NOT_DROPPED_YET = 0,
/** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
SKB_DROP_REASON_NOT_SPECIFIED,
/** @SKB_DROP_REASON_NO_SOCKET: socket not found */
SKB_DROP_REASON_NO_SOCKET,
/** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
SKB_DROP_REASON_PKT_TOO_SMALL,
/** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
SKB_DROP_REASON_TCP_CSUM,
/** @SKB_DROP_REASON_SOCKET_FILTER: dropped by socket filter */
SKB_DROP_REASON_SOCKET_FILTER,
/** @SKB_DROP_REASON_UDP_CSUM: UDP checksum error */
SKB_DROP_REASON_UDP_CSUM,
/** @SKB_DROP_REASON_NETFILTER_DROP: dropped by netfilter */
SKB_DROP_REASON_NETFILTER_DROP,
/**
* @SKB_DROP_REASON_OTHERHOST: packet don't belong to current host
* (interface is in promisc mode)
*/
SKB_DROP_REASON_OTHERHOST,
/** @SKB_DROP_REASON_IP_CSUM: IP checksum error */
SKB_DROP_REASON_IP_CSUM,
/**
* @SKB_DROP_REASON_IP_INHDR: there is something wrong with IP header (see
* IPSTATS_MIB_INHDRERRORS)
*/
SKB_DROP_REASON_IP_INHDR,
/**
* @SKB_DROP_REASON_IP_RPFILTER: IP rpfilter validate failed. see the
* document for rp_filter in ip-sysctl.rst for more information
*/
SKB_DROP_REASON_IP_RPFILTER,
/**
* @SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST: destination address of L2 is
* multicast, but L3 is unicast.
*/
SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
/** @SKB_DROP_REASON_XFRM_POLICY: xfrm policy check failed */
SKB_DROP_REASON_XFRM_POLICY,
/** @SKB_DROP_REASON_IP_NOPROTO: no support for IP protocol */
SKB_DROP_REASON_IP_NOPROTO,
/** @SKB_DROP_REASON_SOCKET_RCVBUFF: socket receive buff is full */
SKB_DROP_REASON_SOCKET_RCVBUFF,
/**
* @SKB_DROP_REASON_PROTO_MEM: proto memory limition, such as udp packet
* drop out of udp_memory_allocated.
*/
SKB_DROP_REASON_PROTO_MEM,
/**
* @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
* corresponding to LINUX_MIB_TCPMD5NOTFOUND
*/
SKB_DROP_REASON_TCP_MD5NOTFOUND,
/**
* @SKB_DROP_REASON_TCP_MD5UNEXPECTED: MD5 hash and we're not expecting
* one, corresponding to LINUX_MIB_TCPMD5UNEXPECTED
*/
SKB_DROP_REASON_TCP_MD5UNEXPECTED,
/**
* @SKB_DROP_REASON_TCP_MD5FAILURE: MD5 hash and its wrong, corresponding
* to LINUX_MIB_TCPMD5FAILURE
*/
SKB_DROP_REASON_TCP_MD5FAILURE,
/**
* @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
* see LINUX_MIB_TCPBACKLOGDROP)
*/
SKB_DROP_REASON_SOCKET_BACKLOG,
/** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
SKB_DROP_REASON_TCP_FLAGS,
/**
* @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
* see LINUX_MIB_TCPZEROWINDOWDROP
*/
SKB_DROP_REASON_TCP_ZEROWINDOW,
/**
* @SKB_DROP_REASON_TCP_OLD_DATA: the TCP data reveived is already
* received before (spurious retrans may happened), see
* LINUX_MIB_DELAYEDACKLOST
*/
SKB_DROP_REASON_TCP_OLD_DATA,
/**
* @SKB_DROP_REASON_TCP_OVERWINDOW: the TCP data is out of window,
* the seq of the first byte exceed the right edges of receive
* window
*/
SKB_DROP_REASON_TCP_OVERWINDOW,
/**
* @SKB_DROP_REASON_TCP_OFOMERGE: the data of skb is already in the ofo
* queue, corresponding to LINUX_MIB_TCPOFOMERGE
*/
SKB_DROP_REASON_TCP_OFOMERGE,
/**
* @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
* LINUX_MIB_PAWSESTABREJECTED
*/
SKB_DROP_REASON_TCP_RFC7323_PAWS,
/** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
/** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
SKB_DROP_REASON_TCP_RESET,
/**
* @SKB_DROP_REASON_TCP_INVALID_SYN: Incoming packet has unexpected
* SYN flag
*/
SKB_DROP_REASON_TCP_INVALID_SYN,
/** @SKB_DROP_REASON_TCP_CLOSE: TCP socket in CLOSE state */
SKB_DROP_REASON_TCP_CLOSE,
/** @SKB_DROP_REASON_TCP_FASTOPEN: dropped by FASTOPEN request socket */
SKB_DROP_REASON_TCP_FASTOPEN,
/** @SKB_DROP_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
SKB_DROP_REASON_TCP_OLD_ACK,
/** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
SKB_DROP_REASON_TCP_TOO_OLD_ACK,
/**
* @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
* sent yet
*/
SKB_DROP_REASON_TCP_ACK_UNSENT_DATA,
/** @SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE: pruned from TCP OFO queue */
SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE,
/** @SKB_DROP_REASON_TCP_OFO_DROP: data already in receive queue */
SKB_DROP_REASON_TCP_OFO_DROP,
/** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
SKB_DROP_REASON_IP_OUTNOROUTES,
/**
* @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
* eBPF program
*/
SKB_DROP_REASON_BPF_CGROUP_EGRESS,
/** @SKB_DROP_REASON_IPV6DISABLED: IPv6 is disabled on the device */
SKB_DROP_REASON_IPV6DISABLED,
/** @SKB_DROP_REASON_NEIGH_CREATEFAIL: failed to create neigh entry */
SKB_DROP_REASON_NEIGH_CREATEFAIL,
/** @SKB_DROP_REASON_NEIGH_FAILED: neigh entry in failed state */
SKB_DROP_REASON_NEIGH_FAILED,
/** @SKB_DROP_REASON_NEIGH_QUEUEFULL: arp_queue for neigh entry is full */
SKB_DROP_REASON_NEIGH_QUEUEFULL,
/** @SKB_DROP_REASON_NEIGH_DEAD: neigh entry is dead */
SKB_DROP_REASON_NEIGH_DEAD,
/** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */
SKB_DROP_REASON_TC_EGRESS,
/**
* @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (
* failed to enqueue to current qdisc)
*/
SKB_DROP_REASON_QDISC_DROP,
/**
* @SKB_DROP_REASON_CPU_BACKLOG: failed to enqueue the skb to the per CPU
* backlog queue. This can be caused by backlog queue full (see
* netdev_max_backlog in net.rst) or RPS flow limit
*/
SKB_DROP_REASON_CPU_BACKLOG,
/** @SKB_DROP_REASON_XDP: dropped by XDP in input path */
SKB_DROP_REASON_XDP,
/** @SKB_DROP_REASON_TC_INGRESS: dropped in TC ingress HOOK */
SKB_DROP_REASON_TC_INGRESS,
/** @SKB_DROP_REASON_UNHANDLED_PROTO: protocol not implemented or not supported */
SKB_DROP_REASON_UNHANDLED_PROTO,
/** @SKB_DROP_REASON_SKB_CSUM: sk_buff checksum computation error */
SKB_DROP_REASON_SKB_CSUM,
/** @SKB_DROP_REASON_SKB_GSO_SEG: gso segmentation error */
SKB_DROP_REASON_SKB_GSO_SEG,
/**
* @SKB_DROP_REASON_SKB_UCOPY_FAULT: failed to copy data from user space,
* e.g., via zerocopy_sg_from_iter() or skb_orphan_frags_rx()
*/
SKB_DROP_REASON_SKB_UCOPY_FAULT,
/** @SKB_DROP_REASON_DEV_HDR: device driver specific header/metadata is invalid */
SKB_DROP_REASON_DEV_HDR,
/**
* @SKB_DROP_REASON_DEV_READY: the device is not ready to xmit/recv due to
* any of its data structure that is not up/ready/initialized,
* e.g., the IFF_UP is not set, or driver specific tun->tfiles[txq]
* is not initialized
*/
SKB_DROP_REASON_DEV_READY,
/** @SKB_DROP_REASON_FULL_RING: ring buffer is full */
SKB_DROP_REASON_FULL_RING,
/** @SKB_DROP_REASON_NOMEM: error due to OOM */
SKB_DROP_REASON_NOMEM,
/**
* @SKB_DROP_REASON_HDR_TRUNC: failed to trunc/extract the header from
* networking data, e.g., failed to pull the protocol header from
* frags via pskb_may_pull()
*/
SKB_DROP_REASON_HDR_TRUNC,
/**
* @SKB_DROP_REASON_TAP_FILTER: dropped by (ebpf) filter directly attached
* to tun/tap, e.g., via TUNSETFILTEREBPF
*/
SKB_DROP_REASON_TAP_FILTER,
/**
* @SKB_DROP_REASON_TAP_TXFILTER: dropped by tx filter implemented at
* tun/tap, e.g., check_filter()
*/
SKB_DROP_REASON_TAP_TXFILTER,
/** @SKB_DROP_REASON_ICMP_CSUM: ICMP checksum error */
SKB_DROP_REASON_ICMP_CSUM,
/**
* @SKB_DROP_REASON_INVALID_PROTO: the packet doesn't follow RFC 2211,
* such as a broadcasts ICMP_TIMESTAMP
*/
SKB_DROP_REASON_INVALID_PROTO,
/**
* @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
* IPSTATS_MIB_INADDRERRORS
*/
SKB_DROP_REASON_IP_INADDRERRORS,
/**
* @SKB_DROP_REASON_IP_INNOROUTES: network unreachable, corresponding to
* IPSTATS_MIB_INADDRERRORS
*/
SKB_DROP_REASON_IP_INNOROUTES,
/**
* @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the
* MTU)
*/
SKB_DROP_REASON_PKT_TOO_BIG,
/**
* @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
* used as a real 'reason'
*/
SKB_DROP_REASON_MAX,
};
#define SKB_DR_INIT(name, reason) \
enum skb_drop_reason name = SKB_DROP_REASON_##reason
#define SKB_DR(name) \
SKB_DR_INIT(name, NOT_SPECIFIED)
#define SKB_DR_SET(name, reason) \
(name = SKB_DROP_REASON_##reason)
#define SKB_DR_OR(name, reason) \
do { \
if (name == SKB_DROP_REASON_NOT_SPECIFIED || \
name == SKB_NOT_DROPPED_YET) \
SKB_DR_SET(name, reason); \
} while (0)
extern const char * const drop_reasons[];
#endif

89
include/trace/events/skb.h
View File

@ -9,92 +9,6 @@
#include <linux/netdevice.h>
#include <linux/tracepoint.h>
#define TRACE_SKB_DROP_REASON \
EM(SKB_DROP_REASON_NOT_SPECIFIED, NOT_SPECIFIED) \
EM(SKB_DROP_REASON_NO_SOCKET, NO_SOCKET) \
EM(SKB_DROP_REASON_PKT_TOO_SMALL, PKT_TOO_SMALL) \
EM(SKB_DROP_REASON_TCP_CSUM, TCP_CSUM) \
EM(SKB_DROP_REASON_SOCKET_FILTER, SOCKET_FILTER) \
EM(SKB_DROP_REASON_UDP_CSUM, UDP_CSUM) \
EM(SKB_DROP_REASON_NETFILTER_DROP, NETFILTER_DROP) \
EM(SKB_DROP_REASON_OTHERHOST, OTHERHOST) \
EM(SKB_DROP_REASON_IP_CSUM, IP_CSUM) \
EM(SKB_DROP_REASON_IP_INHDR, IP_INHDR) \
EM(SKB_DROP_REASON_IP_RPFILTER, IP_RPFILTER) \
EM(SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, \
UNICAST_IN_L2_MULTICAST) \
EM(SKB_DROP_REASON_XFRM_POLICY, XFRM_POLICY) \
EM(SKB_DROP_REASON_IP_NOPROTO, IP_NOPROTO) \
EM(SKB_DROP_REASON_SOCKET_RCVBUFF, SOCKET_RCVBUFF) \
EM(SKB_DROP_REASON_PROTO_MEM, PROTO_MEM) \
EM(SKB_DROP_REASON_TCP_MD5NOTFOUND, TCP_MD5NOTFOUND) \
EM(SKB_DROP_REASON_TCP_MD5UNEXPECTED, \
TCP_MD5UNEXPECTED) \
EM(SKB_DROP_REASON_TCP_MD5FAILURE, TCP_MD5FAILURE) \
EM(SKB_DROP_REASON_SOCKET_BACKLOG, SOCKET_BACKLOG) \
EM(SKB_DROP_REASON_TCP_FLAGS, TCP_FLAGS) \
EM(SKB_DROP_REASON_TCP_ZEROWINDOW, TCP_ZEROWINDOW) \
EM(SKB_DROP_REASON_TCP_OLD_DATA, TCP_OLD_DATA) \
EM(SKB_DROP_REASON_TCP_OVERWINDOW, TCP_OVERWINDOW) \
EM(SKB_DROP_REASON_TCP_OFOMERGE, TCP_OFOMERGE) \
EM(SKB_DROP_REASON_TCP_OFO_DROP, TCP_OFO_DROP) \
EM(SKB_DROP_REASON_TCP_RFC7323_PAWS, TCP_RFC7323_PAWS) \
EM(SKB_DROP_REASON_TCP_INVALID_SEQUENCE, \
TCP_INVALID_SEQUENCE) \
EM(SKB_DROP_REASON_TCP_RESET, TCP_RESET) \
EM(SKB_DROP_REASON_TCP_INVALID_SYN, TCP_INVALID_SYN) \
EM(SKB_DROP_REASON_TCP_CLOSE, TCP_CLOSE) \
EM(SKB_DROP_REASON_TCP_FASTOPEN, TCP_FASTOPEN) \
EM(SKB_DROP_REASON_TCP_OLD_ACK, TCP_OLD_ACK) \
EM(SKB_DROP_REASON_TCP_TOO_OLD_ACK, TCP_TOO_OLD_ACK) \
EM(SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, \
TCP_ACK_UNSENT_DATA) \
EM(SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, \
TCP_OFO_QUEUE_PRUNE) \
EM(SKB_DROP_REASON_IP_OUTNOROUTES, IP_OUTNOROUTES) \
EM(SKB_DROP_REASON_BPF_CGROUP_EGRESS, \
BPF_CGROUP_EGRESS) \
EM(SKB_DROP_REASON_IPV6DISABLED, IPV6DISABLED) \
EM(SKB_DROP_REASON_NEIGH_CREATEFAIL, NEIGH_CREATEFAIL) \
EM(SKB_DROP_REASON_NEIGH_FAILED, NEIGH_FAILED) \
EM(SKB_DROP_REASON_NEIGH_QUEUEFULL, NEIGH_QUEUEFULL) \
EM(SKB_DROP_REASON_NEIGH_DEAD, NEIGH_DEAD) \
EM(SKB_DROP_REASON_TC_EGRESS, TC_EGRESS) \
EM(SKB_DROP_REASON_QDISC_DROP, QDISC_DROP) \
EM(SKB_DROP_REASON_CPU_BACKLOG, CPU_BACKLOG) \
EM(SKB_DROP_REASON_XDP, XDP) \
EM(SKB_DROP_REASON_TC_INGRESS, TC_INGRESS) \
EM(SKB_DROP_REASON_UNHANDLED_PROTO, UNHANDLED_PROTO) \
EM(SKB_DROP_REASON_SKB_CSUM, SKB_CSUM) \
EM(SKB_DROP_REASON_SKB_GSO_SEG, SKB_GSO_SEG) \
EM(SKB_DROP_REASON_SKB_UCOPY_FAULT, SKB_UCOPY_FAULT) \
EM(SKB_DROP_REASON_DEV_HDR, DEV_HDR) \
EM(SKB_DROP_REASON_DEV_READY, DEV_READY) \
EM(SKB_DROP_REASON_FULL_RING, FULL_RING) \
EM(SKB_DROP_REASON_NOMEM, NOMEM) \
EM(SKB_DROP_REASON_HDR_TRUNC, HDR_TRUNC) \
EM(SKB_DROP_REASON_TAP_FILTER, TAP_FILTER) \
EM(SKB_DROP_REASON_TAP_TXFILTER, TAP_TXFILTER) \
EM(SKB_DROP_REASON_ICMP_CSUM, ICMP_CSUM) \
EM(SKB_DROP_REASON_INVALID_PROTO, INVALID_PROTO) \
EM(SKB_DROP_REASON_IP_INADDRERRORS, IP_INADDRERRORS) \
EM(SKB_DROP_REASON_IP_INNOROUTES, IP_INNOROUTES) \
EM(SKB_DROP_REASON_PKT_TOO_BIG, PKT_TOO_BIG) \
EMe(SKB_DROP_REASON_MAX, MAX)
#undef EM
#undef EMe
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define EMe(a, b) TRACE_DEFINE_ENUM(a);
TRACE_SKB_DROP_REASON
#undef EM
#undef EMe
#define EM(a, b) { a, #b },
#define EMe(a, b) { a, #b }
/*
* Tracepoint for free an sk_buff:
*/
@ -121,8 +35,7 @@ TRACE_EVENT(kfree_skb,
TP_printk("skbaddr=%p protocol=%u location=%p reason: %s",
__entry->skbaddr, __entry->protocol, __entry->location,
__print_symbolic(__entry->reason,
TRACE_SKB_DROP_REASON))
drop_reasons[__entry->reason])
);
TRACE_EVENT(consume_skb,

1
net/core/.gitignore vendored Normal file
View File

@ -0,0 +1 @@
dropreason_str.c

23
net/core/Makefile
View File

@ -4,7 +4,8 @@
#
obj-y := sock.o request_sock.o skbuff.o datagram.o stream.o scm.o \
gen_stats.o gen_estimator.o net_namespace.o secure_seq.o flow_dissector.o
gen_stats.o gen_estimator.o net_namespace.o secure_seq.o \
flow_dissector.o dropreason_str.o
obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
@ -39,3 +40,23 @@ obj-$(CONFIG_NET_SOCK_MSG) += skmsg.o
obj-$(CONFIG_BPF_SYSCALL) += sock_map.o
obj-$(CONFIG_BPF_SYSCALL) += bpf_sk_storage.o
obj-$(CONFIG_OF) += of_net.o
clean-files := dropreason_str.c
quiet_cmd_dropreason_str = GEN $@
cmd_dropreason_str = awk -F ',' 'BEGIN{ print "\#include <net/dropreason.h>\n"; \
print "const char * const drop_reasons[] = {" }\
/^enum skb_drop/ { dr=1; }\
/^\};/ { dr=0; }\
/^\tSKB_DROP_REASON_/ {\
if (dr) {\
sub(/\tSKB_DROP_REASON_/, "", $$1);\
printf "\t[SKB_DROP_REASON_%s] = \"%s\",\n", $$1, $$1;\
}\
}\
END{ print "};" }' $< > $@
$(obj)/dropreason_str.c: $(srctree)/include/net/dropreason.h
$(call cmd,dropreason_str)
$(obj)/dropreason_str.o: $(obj)/dropreason_str.c

13
net/core/drop_monitor.c
View File

@ -48,19 +48,6 @@
static int trace_state = TRACE_OFF;
static bool monitor_hw;
#undef EM
#undef EMe
#define EM(a, b) [a] = #b,
#define EMe(a, b) [a] = #b
/* drop_reasons is used to translate 'enum skb_drop_reason' to string,
* which is reported to user space.
*/
static const char * const drop_reasons[] = {
TRACE_SKB_DROP_REASON
};
/* net_dm_mutex
*
* An overall lock guarding every operation coming from userspace.

3
net/core/skbuff.c
View File

@ -91,6 +91,9 @@ static struct kmem_cache *skbuff_ext_cache __ro_after_init;
int sysctl_max_skb_frags __read_mostly = MAX_SKB_FRAGS;
EXPORT_SYMBOL(sysctl_max_skb_frags);
/* The array 'drop_reasons' is auto-generated in dropreason_str.c */
EXPORT_SYMBOL(drop_reasons);
/**
* skb_panic - private function for out-of-line support
* @skb: buffer