/* SPDX-License-Identifier: GPL-2.0-or-later */

#include <net/inet_common.h>

enum linux_mptcp_mib_field {
	MPTCP_MIB_NUM = 0,
	MPTCP_MIB_MPCAPABLEPASSIVE,	/* Received SYN with MP_CAPABLE */
	MPTCP_MIB_MPCAPABLEACTIVE,	/* Sent SYN with MP_CAPABLE */
	MPTCP_MIB_MPCAPABLEACTIVEACK,	/* Received SYN/ACK with MP_CAPABLE */
	MPTCP_MIB_MPCAPABLEPASSIVEACK,	/* Received third ACK with MP_CAPABLE */
	MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK,/* Server-side fallback during 3-way handshake */
	MPTCP_MIB_MPCAPABLEACTIVEFALLBACK, /* Client-side fallback during 3-way handshake */
	MPTCP_MIB_MPCAPABLEACTIVEDROP,	/* Client-side fallback due to a MPC drop */
	MPTCP_MIB_MPCAPABLEACTIVEDISABLED, /* Client-side disabled due to past issues */
	MPTCP_MIB_MPCAPABLEENDPATTEMPT,	/* Prohibited MPC to port-based endp */
	MPTCP_MIB_TOKENFALLBACKINIT,	/* Could not init/allocate token */
	MPTCP_MIB_RETRANSSEGS,		/* Segments retransmitted at the MPTCP-level */
	MPTCP_MIB_JOINNOTOKEN,		/* Received MP_JOIN but the token was not found */
	MPTCP_MIB_JOINSYNRX,		/* Received a SYN + MP_JOIN */
	MPTCP_MIB_JOINSYNBACKUPRX,	/* Received a SYN + MP_JOIN + backup flag */
	MPTCP_MIB_JOINSYNACKRX,		/* Received a SYN/ACK + MP_JOIN */
	MPTCP_MIB_JOINSYNACKBACKUPRX,	/* Received a SYN/ACK + MP_JOIN + backup flag */
	MPTCP_MIB_JOINSYNACKMAC,	/* HMAC was wrong on SYN/ACK + MP_JOIN */
	MPTCP_MIB_JOINACKRX,		/* Received an ACK + MP_JOIN */
	MPTCP_MIB_JOINACKMAC,		/* HMAC was wrong on ACK + MP_JOIN */
	MPTCP_MIB_JOINREJECTED,		/* The PM rejected the JOIN request */
	MPTCP_MIB_JOINSYNTX,		/* Sending a SYN + MP_JOIN */
	MPTCP_MIB_JOINSYNTXCREATSKERR,	/* Not able to create a socket when sending a SYN + MP_JOIN */
	MPTCP_MIB_JOINSYNTXBINDERR,	/* Not able to bind() the address when sending a SYN + MP_JOIN */
	MPTCP_MIB_JOINSYNTXCONNECTERR,	/* Not able to connect() when sending a SYN + MP_JOIN */
	MPTCP_MIB_DSSNOMATCH,		/* Received a new mapping that did not match the previous one */
	MPTCP_MIB_DSSCORRUPTIONFALLBACK,/* DSS corruption detected, fallback */
	MPTCP_MIB_DSSCORRUPTIONRESET,	/* DSS corruption detected, MPJ subflow reset */
	MPTCP_MIB_INFINITEMAPTX,	/* Sent an infinite mapping */
	MPTCP_MIB_INFINITEMAPRX,	/* Received an infinite mapping */
	MPTCP_MIB_DSSTCPMISMATCH,	/* DSS-mapping did not map with TCP's sequence numbers */
	MPTCP_MIB_DATACSUMERR,		/* The data checksum fail */
	MPTCP_MIB_OFOQUEUETAIL,	/* Segments inserted into OoO queue tail */
	MPTCP_MIB_OFOQUEUE,		/* Segments inserted into OoO queue */
	MPTCP_MIB_OFOMERGE,		/* Segments merged in OoO queue */
	MPTCP_MIB_NODSSWINDOW,		/* Segments not in MPTCP windows */
	MPTCP_MIB_DUPDATA,		/* Segments discarded due to duplicate DSS */
	MPTCP_MIB_ADDADDR,		/* Received ADD_ADDR with echo-flag=0 */
	MPTCP_MIB_ADDADDRTX,		/* Sent ADD_ADDR with echo-flag=0 */
	MPTCP_MIB_ADDADDRTXDROP,	/* ADD_ADDR with echo-flag=0 not send due to
					 * resource exhaustion
					 */
	MPTCP_MIB_ECHOADD,		/* Received ADD_ADDR with echo-flag=1 */
	MPTCP_MIB_ECHOADDTX,		/* Send ADD_ADDR with echo-flag=1 */
	MPTCP_MIB_ECHOADDTXDROP,	/* ADD_ADDR with echo-flag=1 not send due
					 * to resource exhaustion
					 */
	MPTCP_MIB_PORTADD,		/* Received ADD_ADDR with a port-number */
	MPTCP_MIB_ADDADDRDROP,		/* Dropped incoming ADD_ADDR */
	MPTCP_MIB_JOINPORTSYNRX,	/* Received a SYN MP_JOIN with a different port-number */
	MPTCP_MIB_JOINPORTSYNACKRX,	/* Received a SYNACK MP_JOIN with a different port-number */
	MPTCP_MIB_JOINPORTACKRX,	/* Received an ACK MP_JOIN with a different port-number */
	MPTCP_MIB_MISMATCHPORTSYNRX,	/* Received a SYN MP_JOIN with a mismatched port-number */
	MPTCP_MIB_MISMATCHPORTACKRX,	/* Received an ACK MP_JOIN with a mismatched port-number */
	MPTCP_MIB_RMADDR,		/* Received RM_ADDR */
	MPTCP_MIB_RMADDRDROP,		/* Dropped incoming RM_ADDR */
	MPTCP_MIB_RMADDRTX,		/* Sent RM_ADDR */
	MPTCP_MIB_RMADDRTXDROP,		/* RM_ADDR not sent due to resource exhaustion */
	MPTCP_MIB_RMSUBFLOW,		/* Remove a subflow */
	MPTCP_MIB_MPPRIOTX,		/* Transmit a MP_PRIO */
	MPTCP_MIB_MPPRIORX,		/* Received a MP_PRIO */
	MPTCP_MIB_MPFAILTX,		/* Transmit a MP_FAIL */
	MPTCP_MIB_MPFAILRX,		/* Received a MP_FAIL */
	MPTCP_MIB_MPFASTCLOSETX,	/* Transmit a MP_FASTCLOSE */
	MPTCP_MIB_MPFASTCLOSERX,	/* Received a MP_FASTCLOSE */
	MPTCP_MIB_MPRSTTX,		/* Transmit a MP_RST */
	MPTCP_MIB_MPRSTRX,		/* Received a MP_RST */
	MPTCP_MIB_RCVPRUNED,		/* Incoming packet dropped due to memory limit */
	MPTCP_MIB_SUBFLOWSTALE,		/* Subflows entered 'stale' status */
	MPTCP_MIB_SUBFLOWRECOVER,	/* Subflows returned to active status after being stale */
	MPTCP_MIB_SNDWNDSHARED,		/* Subflow snd wnd is overridden by msk's one */
	MPTCP_MIB_RCVWNDSHARED,		/* Subflow rcv wnd is overridden by msk's one */
	MPTCP_MIB_RCVWNDCONFLICTUPDATE,	/* subflow rcv wnd is overridden by msk's one due to
					 * conflict with another subflow while updating msk rcv wnd
					 */
	MPTCP_MIB_RCVWNDCONFLICT,	/* Conflict with while updating msk rcv wnd */
	MPTCP_MIB_CURRESTAB,		/* Current established MPTCP connections */
	MPTCP_MIB_BLACKHOLE,		/* A blackhole has been detected */
	MPTCP_MIB_MPCAPABLEDATAFALLBACK,	/* Missing DSS/MPC+data on first
					 * established packet
					 */
	MPTCP_MIB_MD5SIGFALLBACK,	/* Conflicting TCP option enabled */
	MPTCP_MIB_DSSFALLBACK,		/* Bad or missing DSS */
	MPTCP_MIB_SIMULTCONNFALLBACK,	/* Simultaneous connect */
	MPTCP_MIB_FALLBACKFAILED,	/* Can't fallback due to msk status */
	__MPTCP_MIB_MAX
};

#define LINUX_MIB_MPTCP_MAX	__MPTCP_MIB_MAX
struct mptcp_mib {
	unsigned long mibs[LINUX_MIB_MPTCP_MAX];
};

static inline void MPTCP_ADD_STATS(struct net *net,
				   enum linux_mptcp_mib_field field,
				   int val)
{
	if (likely(net->mib.mptcp_statistics))
		SNMP_ADD_STATS(net->mib.mptcp_statistics, field, val);
}

static inline void MPTCP_INC_STATS(struct net *net,
				   enum linux_mptcp_mib_field field)
{
	if (likely(net->mib.mptcp_statistics))
		SNMP_INC_STATS(net->mib.mptcp_statistics, field);
}

static inline void __MPTCP_INC_STATS(struct net *net,
				     enum linux_mptcp_mib_field field)
{
	if (likely(net->mib.mptcp_statistics))
		__SNMP_INC_STATS(net->mib.mptcp_statistics, field);
}

static inline void MPTCP_DEC_STATS(struct net *net,
				   enum linux_mptcp_mib_field field)
{
	if (likely(net->mib.mptcp_statistics))
		SNMP_DEC_STATS(net->mib.mptcp_statistics, field);
}

bool mptcp_mib_alloc(struct net *net);