Commit ff8372a4 authored by Menglong Dong's avatar Menglong Dong Committed by Paolo Abeni
Browse files

net: skb: move enum skb_drop_reason to standalone header file 



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

Signed-off-by: default avatarMenglong Dong <imagedong@tencent.com>
Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 12de1ebd

include/linux/skbuff.h

+1 −178
Original line number Diff line number Diff line
@@ -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.

include/net/dropreason.h

0 → 100644
+184 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-or-later */



#ifndef _LINUX_DROPREASON_H

#define _LINUX_DROPREASON_H



/* 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)



#endif