diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/net/lwip/lwip/include/lwip/tcp_impl.h')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/net/lwip/lwip/include/lwip/tcp_impl.h | 471 |
1 files changed, 471 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/net/lwip/lwip/include/lwip/tcp_impl.h b/tmk_core/tool/mbed/mbed-sdk/libraries/net/lwip/lwip/include/lwip/tcp_impl.h new file mode 100644 index 0000000000..b4feec0da1 --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/net/lwip/lwip/include/lwip/tcp_impl.h @@ -0,0 +1,471 @@ +/* + * Copyright (c) 2001-2004 Swedish Institute of Computer Science. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * This file is part of the lwIP TCP/IP stack. + * + * Author: Adam Dunkels <adam@sics.se> + * + */ +#ifndef __LWIP_TCP_IMPL_H__ +#define __LWIP_TCP_IMPL_H__ + +#include "lwip/opt.h" + +#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */ + +#include "lwip/tcp.h" +#include "lwip/sys.h" +#include "lwip/mem.h" +#include "lwip/pbuf.h" +#include "lwip/ip.h" +#include "lwip/icmp.h" +#include "lwip/err.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/* Functions for interfacing with TCP: */ + +/* Lower layer interface to TCP: */ +#define tcp_init() /* Compatibility define, no init needed. */ +void tcp_tmr (void); /* Must be called every + TCP_TMR_INTERVAL + ms. (Typically 250 ms). */ +/* It is also possible to call these two functions at the right + intervals (instead of calling tcp_tmr()). */ +void tcp_slowtmr (void); +void tcp_fasttmr (void); + + +/* Only used by IP to pass a TCP segment to TCP: */ +void tcp_input (struct pbuf *p, struct netif *inp); +/* Used within the TCP code only: */ +struct tcp_pcb * tcp_alloc (u8_t prio); +void tcp_abandon (struct tcp_pcb *pcb, int reset); +err_t tcp_send_empty_ack(struct tcp_pcb *pcb); +void tcp_rexmit (struct tcp_pcb *pcb); +void tcp_rexmit_rto (struct tcp_pcb *pcb); +void tcp_rexmit_fast (struct tcp_pcb *pcb); +u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb); + +/** + * This is the Nagle algorithm: try to combine user data to send as few TCP + * segments as possible. Only send if + * - no previously transmitted data on the connection remains unacknowledged or + * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or + * - the only unsent segment is at least pcb->mss bytes long (or there is more + * than one unsent segment - with lwIP, this can happen although unsent->len < mss) + * - or if we are in fast-retransmit (TF_INFR) + */ +#define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \ + ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \ + (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \ + ((tpcb)->unsent->len >= (tpcb)->mss))) \ + ) ? 1 : 0) +#define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK) + + +#define TCP_SEQ_LT(a,b) ((s32_t)((a)-(b)) < 0) +#define TCP_SEQ_LEQ(a,b) ((s32_t)((a)-(b)) <= 0) +#define TCP_SEQ_GT(a,b) ((s32_t)((a)-(b)) > 0) +#define TCP_SEQ_GEQ(a,b) ((s32_t)((a)-(b)) >= 0) +/* is b<=a<=c? */ +#if 0 /* see bug #10548 */ +#define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b)) +#endif +#define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c)) +#define TCP_FIN 0x01U +#define TCP_SYN 0x02U +#define TCP_RST 0x04U +#define TCP_PSH 0x08U +#define TCP_ACK 0x10U +#define TCP_URG 0x20U +#define TCP_ECE 0x40U +#define TCP_CWR 0x80U + +#define TCP_FLAGS 0x3fU + +/* Length of the TCP header, excluding options. */ +#define TCP_HLEN 20 + +#ifndef TCP_TMR_INTERVAL +#define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */ +#endif /* TCP_TMR_INTERVAL */ + +#ifndef TCP_FAST_INTERVAL +#define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */ +#endif /* TCP_FAST_INTERVAL */ + +#ifndef TCP_SLOW_INTERVAL +#define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */ +#endif /* TCP_SLOW_INTERVAL */ + +#define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */ +#define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */ + +#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */ + +#ifndef TCP_MSL +#define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */ +#endif + +/* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */ +#ifndef TCP_KEEPIDLE_DEFAULT +#define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */ +#endif + +#ifndef TCP_KEEPINTVL_DEFAULT +#define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */ +#endif + +#ifndef TCP_KEEPCNT_DEFAULT +#define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */ +#endif + +#define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */ + +/* Fields are (of course) in network byte order. + * Some fields are converted to host byte order in tcp_input(). + */ +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/bpstruct.h" +#endif +PACK_STRUCT_BEGIN +struct tcp_hdr { + PACK_STRUCT_FIELD(u16_t src); + PACK_STRUCT_FIELD(u16_t dest); + PACK_STRUCT_FIELD(u32_t seqno); + PACK_STRUCT_FIELD(u32_t ackno); + PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags); + PACK_STRUCT_FIELD(u16_t wnd); + PACK_STRUCT_FIELD(u16_t chksum); + PACK_STRUCT_FIELD(u16_t urgp); +} PACK_STRUCT_STRUCT; +PACK_STRUCT_END +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/epstruct.h" +#endif + +#define TCPH_OFFSET(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 8) +#define TCPH_HDRLEN(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 12) +#define TCPH_FLAGS(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS) + +#define TCPH_OFFSET_SET(phdr, offset) (phdr)->_hdrlen_rsvd_flags = htons(((offset) << 8) | TCPH_FLAGS(phdr)) +#define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | TCPH_FLAGS(phdr)) +#define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = (((phdr)->_hdrlen_rsvd_flags & PP_HTONS((u16_t)(~(u16_t)(TCP_FLAGS)))) | htons(flags)) +#define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | (flags)) + +#define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | htons(flags)) +#define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (TCPH_FLAGS(phdr) & ~(flags)) ) + +#define TCP_TCPLEN(seg) ((seg)->len + ((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0)) + +/** Flags used on input processing, not on pcb->flags +*/ +#define TF_RESET (u8_t)0x08U /* Connection was reset. */ +#define TF_CLOSED (u8_t)0x10U /* Connection was sucessfully closed. */ +#define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */ + + +#if LWIP_EVENT_API + +#define TCP_EVENT_ACCEPT(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ + LWIP_EVENT_ACCEPT, NULL, 0, err) +#define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ + LWIP_EVENT_SENT, NULL, space, ERR_OK) +#define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ + LWIP_EVENT_RECV, (p), 0, (err)) +#define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ + LWIP_EVENT_RECV, NULL, 0, ERR_OK) +#define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ + LWIP_EVENT_CONNECTED, NULL, 0, (err)) +#define TCP_EVENT_POLL(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ + LWIP_EVENT_POLL, NULL, 0, ERR_OK) +#define TCP_EVENT_ERR(errf,arg,err) lwip_tcp_event((arg), NULL, \ + LWIP_EVENT_ERR, NULL, 0, (err)) + +#else /* LWIP_EVENT_API */ + +#define TCP_EVENT_ACCEPT(pcb,err,ret) \ + do { \ + if((pcb)->accept != NULL) \ + (ret) = (pcb)->accept((pcb)->callback_arg,(pcb),(err)); \ + else (ret) = ERR_ARG; \ + } while (0) + +#define TCP_EVENT_SENT(pcb,space,ret) \ + do { \ + if((pcb)->sent != NULL) \ + (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \ + else (ret) = ERR_OK; \ + } while (0) + +#define TCP_EVENT_RECV(pcb,p,err,ret) \ + do { \ + if((pcb)->recv != NULL) { \ + (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\ + } else { \ + (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \ + } \ + } while (0) + +#define TCP_EVENT_CLOSED(pcb,ret) \ + do { \ + if(((pcb)->recv != NULL)) { \ + (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\ + } else { \ + (ret) = ERR_OK; \ + } \ + } while (0) + +#define TCP_EVENT_CONNECTED(pcb,err,ret) \ + do { \ + if((pcb)->connected != NULL) \ + (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \ + else (ret) = ERR_OK; \ + } while (0) + +#define TCP_EVENT_POLL(pcb,ret) \ + do { \ + if((pcb)->poll != NULL) \ + (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \ + else (ret) = ERR_OK; \ + } while (0) + +#define TCP_EVENT_ERR(errf,arg,err) \ + do { \ + if((errf) != NULL) \ + (errf)((arg),(err)); \ + } while (0) + +#endif /* LWIP_EVENT_API */ + +/** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */ +#if TCP_OVERSIZE && defined(LWIP_DEBUG) +#define TCP_OVERSIZE_DBGCHECK 1 +#else +#define TCP_OVERSIZE_DBGCHECK 0 +#endif + +/** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */ +#define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP) + +/* This structure represents a TCP segment on the unsent, unacked and ooseq queues */ +struct tcp_seg { + struct tcp_seg *next; /* used when putting segements on a queue */ + struct pbuf *p; /* buffer containing data + TCP header */ + u16_t len; /* the TCP length of this segment */ +#if TCP_OVERSIZE_DBGCHECK + u16_t oversize_left; /* Extra bytes available at the end of the last + pbuf in unsent (used for asserting vs. + tcp_pcb.unsent_oversized only) */ +#endif /* TCP_OVERSIZE_DBGCHECK */ +#if TCP_CHECKSUM_ON_COPY + u16_t chksum; + u8_t chksum_swapped; +#endif /* TCP_CHECKSUM_ON_COPY */ + u8_t flags; +#define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */ +#define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */ +#define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is + checksummed into 'chksum' */ + struct tcp_hdr *tcphdr; /* the TCP header */ +}; + +#define LWIP_TCP_OPT_LENGTH(flags) \ + (flags & TF_SEG_OPTS_MSS ? 4 : 0) + \ + (flags & TF_SEG_OPTS_TS ? 12 : 0) + +/** This returns a TCP header option for MSS in an u32_t */ +#define TCP_BUILD_MSS_OPTION(x) (x) = PP_HTONL(((u32_t)2 << 24) | \ + ((u32_t)4 << 16) | \ + (((u32_t)TCP_MSS / 256) << 8) | \ + (TCP_MSS & 255)) + +/* Global variables: */ +extern struct tcp_pcb *tcp_input_pcb; +extern u32_t tcp_ticks; + +/* The TCP PCB lists. */ +union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */ + struct tcp_pcb_listen *listen_pcbs; + struct tcp_pcb *pcbs; +}; +extern struct tcp_pcb *tcp_bound_pcbs; +extern union tcp_listen_pcbs_t tcp_listen_pcbs; +extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a + state in which they accept or send + data. */ +extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */ + +extern struct tcp_pcb *tcp_tmp_pcb; /* Only used for temporary storage. */ + +/* Axioms about the above lists: + 1) Every TCP PCB that is not CLOSED is in one of the lists. + 2) A PCB is only in one of the lists. + 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state. + 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state. +*/ +/* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB + with a PCB list or removes a PCB from a list, respectively. */ +#ifndef TCP_DEBUG_PCB_LISTS +#define TCP_DEBUG_PCB_LISTS 0 +#endif +#if TCP_DEBUG_PCB_LISTS +#define TCP_REG(pcbs, npcb) do {\ + LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \ + for(tcp_tmp_pcb = *(pcbs); \ + tcp_tmp_pcb != NULL; \ + tcp_tmp_pcb = tcp_tmp_pcb->next) { \ + LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \ + } \ + LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \ + (npcb)->next = *(pcbs); \ + LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \ + *(pcbs) = (npcb); \ + LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \ + tcp_timer_needed(); \ + } while(0) +#define TCP_RMV(pcbs, npcb) do { \ + LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \ + LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \ + if(*(pcbs) == (npcb)) { \ + *(pcbs) = (*pcbs)->next; \ + } else for(tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \ + if(tcp_tmp_pcb->next == (npcb)) { \ + tcp_tmp_pcb->next = (npcb)->next; \ + break; \ + } \ + } \ + (npcb)->next = NULL; \ + LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \ + LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs))); \ + } while(0) + +#else /* LWIP_DEBUG */ + +#define TCP_REG(pcbs, npcb) \ + do { \ + (npcb)->next = *pcbs; \ + *(pcbs) = (npcb); \ + tcp_timer_needed(); \ + } while (0) + +#define TCP_RMV(pcbs, npcb) \ + do { \ + if(*(pcbs) == (npcb)) { \ + (*(pcbs)) = (*pcbs)->next; \ + } \ + else { \ + for(tcp_tmp_pcb = *pcbs; \ + tcp_tmp_pcb != NULL; \ + tcp_tmp_pcb = tcp_tmp_pcb->next) { \ + if(tcp_tmp_pcb->next == (npcb)) { \ + tcp_tmp_pcb->next = (npcb)->next; \ + break; \ + } \ + } \ + } \ + (npcb)->next = NULL; \ + } while(0) + +#endif /* LWIP_DEBUG */ + + +/* Internal functions: */ +struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb); +void tcp_pcb_purge(struct tcp_pcb *pcb); +void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb); + +void tcp_segs_free(struct tcp_seg *seg); +void tcp_seg_free(struct tcp_seg *seg); +struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg); + +#define tcp_ack(pcb) \ + do { \ + if((pcb)->flags & TF_ACK_DELAY) { \ + (pcb)->flags &= ~TF_ACK_DELAY; \ + (pcb)->flags |= TF_ACK_NOW; \ + } \ + else { \ + (pcb)->flags |= TF_ACK_DELAY; \ + } \ + } while (0) + +#define tcp_ack_now(pcb) \ + do { \ + (pcb)->flags |= TF_ACK_NOW; \ + } while (0) + +err_t tcp_send_fin(struct tcp_pcb *pcb); +err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags); + +void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg); + +void tcp_rst(u32_t seqno, u32_t ackno, + ip_addr_t *local_ip, ip_addr_t *remote_ip, + u16_t local_port, u16_t remote_port); + +u32_t tcp_next_iss(void); + +void tcp_keepalive(struct tcp_pcb *pcb); +void tcp_zero_window_probe(struct tcp_pcb *pcb); + +#if TCP_CALCULATE_EFF_SEND_MSS +u16_t tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr); +#endif /* TCP_CALCULATE_EFF_SEND_MSS */ + +#if LWIP_CALLBACK_API +err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err); +#endif /* LWIP_CALLBACK_API */ + +#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG +void tcp_debug_print(struct tcp_hdr *tcphdr); +void tcp_debug_print_flags(u8_t flags); +void tcp_debug_print_state(enum tcp_state s); +void tcp_debug_print_pcbs(void); +s16_t tcp_pcbs_sane(void); +#else +# define tcp_debug_print(tcphdr) +# define tcp_debug_print_flags(flags) +# define tcp_debug_print_state(s) +# define tcp_debug_print_pcbs() +# define tcp_pcbs_sane() 1 +#endif /* TCP_DEBUG */ + +/** External function (implemented in timers.c), called when TCP detects + * that a timer is needed (i.e. active- or time-wait-pcb found). */ +void tcp_timer_needed(void); + + +#ifdef __cplusplus +} +#endif + +#endif /* LWIP_TCP */ + +#endif /* __LWIP_TCP_H__ */ |