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opt.h File Reference
`#include "lwipopts.h"`
`#include "lwip/debug.h"`

## Macros

#define | NO_SYS 0
#define | LWIP_TIMERS 1
#define | LWIP_TIMERS_CUSTOM 0
#define | MEMCPY(dst, src, len)
#define | SMEMCPY(dst, src, len)
#define | MEMMOVE(dst, src, len)
#define | LWIP_MPU_COMPATIBLE 0
#define | LWIP_TCPIP_CORE_LOCKING 1
#define | LWIP_TCPIP_CORE_LOCKING_INPUT 0
#define | SYS_LIGHTWEIGHT_PROT 1
#define | LWIP_ASSERT_CORE_LOCKED()
#define | MEM_LIBC_MALLOC 0
#define | MEM_CUSTOM_ALLOCATOR 0
#define | MEMP_MEM_MALLOC 0
#define | MEMP_MEM_INIT 0
#define | MEM_ALIGNMENT 1
#define | MEM_SIZE 1600
#define | MEMP_OVERFLOW_CHECK 0
#define | MEMP_SANITY_CHECK 0
#define | MEM_OVERFLOW_CHECK 0
#define | MEM_SANITY_CHECK 0
#define | MEM_USE_POOLS 0
#define | MEM_USE_POOLS_TRY_BIGGER_POOL 0
#define | MEMP_USE_CUSTOM_POOLS 0
#define | LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 0
#define | MEMP_NUM_PBUF 16
#define | MEMP_NUM_RAW_PCB 4
#define | MEMP_NUM_UDP_PCB 4
#define | MEMP_NUM_TCP_PCB 5
#define | MEMP_NUM_TCP_PCB_LISTEN 8
#define | MEMP_NUM_TCP_SEG 16
#define | MEMP_NUM_ALTCP_PCB MEMP_NUM_TCP_PCB
#define | MEMP_NUM_REASSDATA 5
#define | MEMP_NUM_FRAG_PBUF 15
#define | MEMP_NUM_ARP_QUEUE 30
#define | MEMP_NUM_IGMP_GROUP 8
#define | LWIP_NUM_SYS_TIMEOUT_INTERNAL (LWIP_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_ACD + LWIP_IGMP + LWIP_DNS + PPP_NUM_TIMEOUTS + (LWIP_IPV6 * (1 + LWIP_IPV6_REASS + LWIP_IPV6_MLD + LWIP_IPV6_DHCP6)))
#define | MEMP_NUM_SYS_TIMEOUT LWIP_NUM_SYS_TIMEOUT_INTERNAL
#define | MEMP_NUM_NETBUF 2
#define | MEMP_NUM_NETCONN 4
#define | MEMP_NUM_SELECT_CB 4
#define | MEMP_NUM_TCPIP_MSG_API 8
#define | MEMP_NUM_TCPIP_MSG_INPKT 8
#define | MEMP_NUM_NETDB 1
#define | MEMP_NUM_LOCALHOSTLIST 1
#define | PBUF_POOL_SIZE 16
#define | MEMP_NUM_API_MSG MEMP_NUM_TCPIP_MSG_API
#define | MEMP_NUM_DNS_API_MSG MEMP_NUM_TCPIP_MSG_API
#define | MEMP_NUM_SOCKET_SETGETSOCKOPT_DATA MEMP_NUM_TCPIP_MSG_API
#define | MEMP_NUM_NETIFAPI_MSG MEMP_NUM_TCPIP_MSG_API
#define | LWIP_ARP 1
#define | ARP_TABLE_SIZE 10
#define | ARP_MAXAGE 300
#define | ARP_QUEUEING 0
#define | ARP_QUEUE_LEN 3
#define | ETHARP_SUPPORT_VLAN 0
#define | LWIP_ETHERNET LWIP_ARP
#define | ETH_PAD_SIZE 0
#define | ETHARP_SUPPORT_STATIC_ENTRIES 0
#define | ETHARP_TABLE_MATCH_NETIF !LWIP_SINGLE_NETIF
#define | LWIP_IPV4 1
#define | IP_FORWARD 0
#define | IP_REASSEMBLY 1
#define | IP_FRAG 1
#define | IP_OPTIONS_ALLOWED 1
#define | IP_REASS_MAXAGE 15
#define | IP_REASS_MAX_PBUFS 10
#define | IP_DEFAULT_TTL 255
#define | IP_SOF_BROADCAST 0
#define | IP_SOF_BROADCAST_RECV 0
#define | IP_FORWARD_ALLOW_TX_ON_RX_NETIF 0
#define | LWIP_ICMP 1
#define | ICMP_TTL IP_DEFAULT_TTL
#define | LWIP_BROADCAST_PING 0
#define | LWIP_MULTICAST_PING 0
#define | LWIP_RAW 0
#define | RAW_TTL IP_DEFAULT_TTL
#define | LWIP_DHCP 0
#define | LWIP_DHCP_DOES_ACD_CHECK LWIP_DHCP
#define | LWIP_DHCP_BOOTP_FILE 0
#define | LWIP_DHCP_GET_NTP_SRV 0
#define | LWIP_DHCP_MAX_NTP_SERVERS 1
#define | LWIP_DHCP_MAX_DNS_SERVERS DNS_MAX_SERVERS
#define | LWIP_DHCP_DISCOVER_ADD_HOSTNAME 1
#define | LWIP_AUTOIP 0
#define | LWIP_DHCP_AUTOIP_COOP 0
#define | LWIP_DHCP_AUTOIP_COOP_TRIES 9
#define | LWIP_ACD (LWIP_AUTOIP || LWIP_DHCP_DOES_ACD_CHECK)
#define | LWIP_MIB2_CALLBACKS 0
#define | LWIP_MULTICAST_TX_OPTIONS ((LWIP_IGMP || LWIP_IPV6_MLD) && (LWIP_UDP || LWIP_RAW))
#define | LWIP_IGMP 0
#define | LWIP_DNS 0
#define | DNS_TABLE_SIZE 4
#define | DNS_MAX_NAME_LENGTH 256
#define | DNS_MAX_SERVERS 2
#define | DNS_MAX_RETRIES 4
#define | DNS_DOES_NAME_CHECK 1
#define | LWIP_DNS_SECURE (LWIP_DNS_SECURE_RAND_XID | LWIP_DNS_SECURE_NO_MULTIPLE_OUTSTANDING | LWIP_DNS_SECURE_RAND_SRC_PORT)
#define | DNS_LOCAL_HOSTLIST 0
#define | DNS_LOCAL_HOSTLIST_IS_DYNAMIC 0
#define | LWIP_DNS_SUPPORT_MDNS_QUERIES 0
#define | LWIP_UDP 1
#define | LWIP_UDPLITE 0
#define | UDP_TTL IP_DEFAULT_TTL
#define | LWIP_NETBUF_RECVINFO 0
#define | LWIP_TCP 1
#define | TCP_TTL IP_DEFAULT_TTL
#define | TCP_WND (4 * TCP_MSS)
#define | TCP_MAXRTX 12
#define | TCP_SYNMAXRTX 6
#define | TCP_QUEUE_OOSEQ LWIP_TCP
#define | LWIP_TCP_SACK_OUT 0
#define | LWIP_TCP_MAX_SACK_NUM 4
#define | TCP_MSS 536
#define | TCP_CALCULATE_EFF_SEND_MSS 1
#define | LWIP_TCP_RTO_TIME 3000
#define | TCP_SND_BUF (2 * TCP_MSS)
#define | TCP_SND_QUEUELEN ((4 * (TCP_SND_BUF) + (TCP_MSS - 1))/(TCP_MSS))
#define | TCP_SNDLOWAT LWIP_MIN(LWIP_MAX(((TCP_SND_BUF)/2), (2 * TCP_MSS) + 1), (TCP_SND_BUF) - 1)
#define | TCP_SNDQUEUELOWAT LWIP_MAX(((TCP_SND_QUEUELEN)/2), 5)
#define | TCP_OOSEQ_MAX_BYTES 0
#define | TCP_OOSEQ_MAX_PBUFS 0
#define | TCP_LISTEN_BACKLOG 0
#define | TCP_DEFAULT_LISTEN_BACKLOG 0xff
#define | TCP_OVERSIZE TCP_MSS
#define | LWIP_TCP_TIMESTAMPS 0
#define | TCP_WND_UPDATE_THRESHOLD LWIP_MIN((TCP_WND / 4), (TCP_MSS * 4))
#define | LWIP_EVENT_API 0
#define | LWIP_WND_SCALE 0
#define | LWIP_TCP_PCB_NUM_EXT_ARGS 0
#define | LWIP_ALTCP 0
#define | LWIP_ALTCP_TLS 0
#define | PBUF_LINK_HLEN (14 + ETH_PAD_SIZE)
#define | PBUF_LINK_ENCAPSULATION_HLEN 0
#define | PBUF_POOL_BUFSIZE LWIP_MEM_ALIGN_SIZE(TCP_MSS+PBUF_IP_HLEN+PBUF_TRANSPORT_HLEN+PBUF_LINK_ENCAPSULATION_HLEN+PBUF_LINK_HLEN)
#define | LWIP_PBUF_REF_T u8_t
#define | LWIP_PBUF_CUSTOM_DATA
#define | LWIP_PBUF_CUSTOM_DATA_INIT(p)
#define | LWIP_SINGLE_NETIF 0
#define | LWIP_NETIF_HOSTNAME 0
#define | LWIP_NETIF_API 0
#define | LWIP_NETIF_STATUS_CALLBACK 0
#define | LWIP_NETIF_EXT_STATUS_CALLBACK 0
#define | LWIP_NETIF_LINK_CALLBACK 0
#define | LWIP_NETIF_REMOVE_CALLBACK 0
#define | LWIP_NETIF_HWADDRHINT 0
#define | LWIP_NETIF_TX_SINGLE_PBUF 0
#define | LWIP_NUM_NETIF_CLIENT_DATA 0
#define | LWIP_HAVE_LOOPIF (LWIP_NETIF_LOOPBACK && !LWIP_SINGLE_NETIF)
#define | LWIP_LOOPIF_MULTICAST 0
#define | LWIP_NETIF_LOOPBACK 0
#define | LWIP_LOOPBACK_MAX_PBUFS 0
#define | LWIP_NETIF_LOOPBACK_MULTITHREADING (!NO_SYS)
#define | TCPIP_THREAD_NAME "tcpip_thread"
#define | TCPIP_THREAD_STACKSIZE 0
#define | TCPIP_THREAD_PRIO 1
#define | TCPIP_MBOX_SIZE 0
#define | LWIP_TCPIP_THREAD_ALIVE()
#define | SLIPIF_THREAD_NAME "slipif_loop"
#define | SLIPIF_THREAD_STACKSIZE 0
#define | SLIPIF_THREAD_PRIO 1
#define | DEFAULT_THREAD_NAME "lwIP"
#define | DEFAULT_THREAD_STACKSIZE 0
#define | DEFAULT_THREAD_PRIO 1
#define | DEFAULT_RAW_RECVMBOX_SIZE 0
#define | DEFAULT_UDP_RECVMBOX_SIZE 0
#define | DEFAULT_TCP_RECVMBOX_SIZE 0
#define | DEFAULT_ACCEPTMBOX_SIZE 0
#define | LWIP_NETCONN 1
#define | LWIP_TCPIP_TIMEOUT 0
#define | LWIP_NETCONN_SEM_PER_THREAD 0
#define | LWIP_NETCONN_FULLDUPLEX 0
#define | LWIP_SOCKET 1
#define | LWIP_COMPAT_SOCKETS 1
#define | LWIP_POSIX_SOCKETS_IO_NAMES 1
#define | LWIP_SOCKET_OFFSET 0
#define | LWIP_SOCKET_EXTERNAL_HEADERS 0
#define | LWIP_SOCKET_OPEN_COUNT 0
#define | LWIP_TCP_KEEPALIVE 0
#define | LWIP_SO_SNDTIMEO 0
#define | LWIP_SO_RCVTIMEO 0
#define | LWIP_SO_SNDRCVTIMEO_NONSTANDARD 0
#define | LWIP_SO_RCVBUF 0
#define | LWIP_SO_LINGER 0
#define | RECV_BUFSIZE_DEFAULT INT_MAX
#define | LWIP_TCP_CLOSE_TIMEOUT_MS_DEFAULT 20000
#define | SO_REUSE 0
#define | SO_REUSE_RXTOALL 0
#define | LWIP_FIONREAD_LINUXMODE 0
#define | LWIP_SOCKET_SELECT 1
#define | LWIP_SOCKET_POLL 1
#define | LWIP_STATS 1
#define | LWIP_STATS_DISPLAY 0
#define | LINK_STATS 1
#define | ETHARP_STATS (LWIP_ARP)
#define | IP_STATS 1
#define | IPFRAG_STATS (IP_REASSEMBLY || IP_FRAG)
#define | ICMP_STATS 1
#define | IGMP_STATS (LWIP_IGMP)
#define | UDP_STATS (LWIP_UDP)
#define | TCP_STATS (LWIP_TCP)
#define | MEM_STATS ((MEM_CUSTOM_ALLOCATOR == 0) && (MEM_USE_POOLS == 0))
#define | MEMP_STATS (MEMP_MEM_MALLOC == 0)
#define | SYS_STATS (NO_SYS == 0)
#define | IP6_STATS (LWIP_IPV6)
#define | ICMP6_STATS (LWIP_IPV6 && LWIP_ICMP6)
#define | IP6_FRAG_STATS (LWIP_IPV6 && (LWIP_IPV6_FRAG || LWIP_IPV6_REASS))
#define | MLD6_STATS (LWIP_IPV6 && LWIP_IPV6_MLD)
#define | ND6_STATS (LWIP_IPV6)
#define | MIB2_STATS 0
#define | LWIP_CHECKSUM_CTRL_PER_NETIF 0
#define | CHECKSUM_GEN_IP 1
#define | CHECKSUM_GEN_UDP 1
#define | CHECKSUM_GEN_TCP 1
#define | CHECKSUM_GEN_ICMP 1
#define | CHECKSUM_GEN_ICMP6 1
#define | CHECKSUM_CHECK_IP 1
#define | CHECKSUM_CHECK_UDP 1
#define | CHECKSUM_CHECK_TCP 1
#define | CHECKSUM_CHECK_ICMP 1
#define | CHECKSUM_CHECK_ICMP6 1
#define | LWIP_CHECKSUM_ON_COPY 0
#define | LWIP_IPV6 0
#define | IPV6_REASS_MAXAGE 60
#define | LWIP_IPV6_SCOPES (LWIP_IPV6 && !LWIP_SINGLE_NETIF)
#define | LWIP_IPV6_SCOPES_DEBUG 0
#define | LWIP_IPV6_NUM_ADDRESSES 3
#define | LWIP_IPV6_FORWARD 0
#define | LWIP_IPV6_FRAG 1
#define | LWIP_IPV6_REASS LWIP_IPV6
#define | LWIP_IPV6_SEND_ROUTER_SOLICIT LWIP_IPV6
#define | LWIP_IPV6_AUTOCONFIG LWIP_IPV6
#define | LWIP_IPV6_ADDRESS_LIFETIMES LWIP_IPV6_AUTOCONFIG
#define | LWIP_IPV6_DUP_DETECT_ATTEMPTS 1
#define | LWIP_ICMP6 LWIP_IPV6
#define | LWIP_ICMP6_DATASIZE 0
#define | LWIP_ICMP6_HL 255
#define | LWIP_IPV6_MLD LWIP_IPV6
#define | MEMP_NUM_MLD6_GROUP 4
#define | LWIP_ND6_QUEUEING LWIP_IPV6
#define | MEMP_NUM_ND6_QUEUE 20
#define | LWIP_ND6_NUM_NEIGHBORS 10
#define | LWIP_ND6_NUM_DESTINATIONS 10
#define | LWIP_ND6_NUM_PREFIXES 5
#define | LWIP_ND6_NUM_ROUTERS 3
#define | LWIP_ND6_MAX_MULTICAST_SOLICIT 3
#define | LWIP_ND6_MAX_UNICAST_SOLICIT 3
#define | LWIP_ND6_MAX_ANYCAST_DELAY_TIME 1000
#define | LWIP_ND6_MAX_NEIGHBOR_ADVERTISEMENT 3
#define | LWIP_ND6_REACHABLE_TIME 30000
#define | LWIP_ND6_RETRANS_TIMER 1000
#define | LWIP_ND6_DELAY_FIRST_PROBE_TIME 5000
#define | LWIP_ND6_ALLOW_RA_UPDATES 1
#define | LWIP_ND6_TCP_REACHABILITY_HINTS 1
#define | LWIP_ND6_RDNSS_MAX_DNS_SERVERS 0
#define | LWIP_IPV6_DHCP6 0
#define | LWIP_IPV6_DHCP6_STATEFUL 0
#define | LWIP_IPV6_DHCP6_STATELESS LWIP_IPV6_DHCP6
#define | LWIP_DHCP6_GET_NTP_SRV 0
#define | LWIP_DHCP6_MAX_NTP_SERVERS 1
#define | LWIP_DHCP6_MAX_DNS_SERVERS DNS_MAX_SERVERS
#define | LWIP_HOOK_FILENAME "path/to/my/lwip_hooks.h"
#define | LWIP_HOOK_TCP_ISN(local_ip, local_port, remote_ip, remote_port)
#define | LWIP_HOOK_TCP_INPACKET_PCB(pcb, hdr, optlen, opt1len, opt2, p)
#define | LWIP_HOOK_TCP_OUT_TCPOPT_LENGTH(pcb, internal_len)
#define | LWIP_HOOK_TCP_OUT_ADD_TCPOPTS(p, hdr, pcb, opts)
#define | LWIP_HOOK_IP4_INPUT(pbuf, input_netif)
#define | LWIP_HOOK_IP4_ROUTE()
#define | LWIP_HOOK_IP4_ROUTE_SRC(src, dest)
#define | LWIP_HOOK_IP4_CANFORWARD(src, dest)
#define | LWIP_HOOK_ETHARP_GET_GW(netif, dest)
#define | LWIP_HOOK_IP6_INPUT(pbuf, input_netif)
#define | LWIP_HOOK_IP6_ROUTE(src, dest)
#define | LWIP_HOOK_ND6_GET_GW(netif, dest)
#define | LWIP_HOOK_VLAN_CHECK(netif, eth_hdr, vlan_hdr)
#define | LWIP_HOOK_VLAN_SET(netif, p, src, dst, eth_type)
#define | LWIP_HOOK_MEMP_AVAILABLE(memp_t_type)
#define | LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(pbuf, netif)
#define | LWIP_HOOK_DHCP_APPEND_OPTIONS(netif, dhcp, state, msg, msg_type, options_len_ptr)
#define | LWIP_HOOK_DHCP_PARSE_OPTION(netif, dhcp, state, msg, msg_type, option, len, pbuf, offset)
#define | LWIP_HOOK_DHCP6_APPEND_OPTIONS(netif, dhcp6, state, msg, msg_type, options_len_ptr, max_len)
#define | LWIP_HOOK_SOCKETS_SETSOCKOPT(s, sock, level, optname, optval, optlen, err)
#define | LWIP_HOOK_SOCKETS_GETSOCKOPT(s, sock, level, optname, optval, optlen, err)
#define | LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE(name, addr, addrtype, err)
#define | LWIP_DBG_MIN_LEVEL LWIP_DBG_LEVEL_ALL
#define | LWIP_DBG_TYPES_ON LWIP_DBG_ON
#define | ETHARP_DEBUG LWIP_DBG_OFF
#define | NETIF_DEBUG LWIP_DBG_OFF
#define | PBUF_DEBUG LWIP_DBG_OFF
#define | API_LIB_DEBUG LWIP_DBG_OFF
#define | API_MSG_DEBUG LWIP_DBG_OFF
#define | SOCKETS_DEBUG LWIP_DBG_OFF
#define | ICMP_DEBUG LWIP_DBG_OFF
#define | IGMP_DEBUG LWIP_DBG_OFF
#define | INET_DEBUG LWIP_DBG_OFF
#define | IP_DEBUG LWIP_DBG_OFF
#define | IP_REASS_DEBUG LWIP_DBG_OFF
#define | RAW_DEBUG LWIP_DBG_OFF
#define | MEM_DEBUG LWIP_DBG_OFF
#define | MEMP_DEBUG LWIP_DBG_OFF
#define | SYS_DEBUG LWIP_DBG_OFF
#define | TIMERS_DEBUG LWIP_DBG_OFF
#define | TCP_DEBUG LWIP_DBG_OFF
#define | TCP_INPUT_DEBUG LWIP_DBG_OFF
#define | TCP_FR_DEBUG LWIP_DBG_OFF
#define | TCP_RTO_DEBUG LWIP_DBG_OFF
#define | TCP_CWND_DEBUG LWIP_DBG_OFF
#define | TCP_WND_DEBUG LWIP_DBG_OFF
#define | TCP_OUTPUT_DEBUG LWIP_DBG_OFF
#define | TCP_RST_DEBUG LWIP_DBG_OFF
#define | TCP_QLEN_DEBUG LWIP_DBG_OFF
#define | UDP_DEBUG LWIP_DBG_OFF
#define | TCPIP_DEBUG LWIP_DBG_OFF
#define | SLIP_DEBUG LWIP_DBG_OFF
#define | DHCP_DEBUG LWIP_DBG_OFF
#define | AUTOIP_DEBUG LWIP_DBG_OFF
#define | ACD_DEBUG LWIP_DBG_OFF
#define | DNS_DEBUG LWIP_DBG_OFF
#define | IP6_DEBUG LWIP_DBG_OFF
#define | DHCP6_DEBUG LWIP_DBG_OFF
#define | LWIP_PERF 0

## Detailed Description

lwIP Options Configuration