Part XLIV. lwIP - the lightweight IP stack for eCosPro

Jonathan Larmour

eCosCentric Limited

Adam Dunkels

LWIP Documentation Notices

Table of Contents

157. lwIP overview
157.1. Introduction
157.2. lwIP sources and ports
157.3. External documentation
157.4. Licensing
158. Basic concepts
158.1. Structure
158.2. Application Programming Interfaces (APIs)
158.3. Protocol implementations
158.4. Packet data buffers
158.5. Configurability
158.6. Limitations
158.7. Quick Start
159. Port
159.1. Port status
159.2. Implementation
159.2.1. System Configuration
159.2.2. System Source
159.2.3. Threads
159.3. Extensions
159.4. eCos API reference
cyg_lwip_init — Initialise lwIP network stack
cyg_lwip_netif_print_info — Output network interface address information
cyg_net_eth_phy_ctx_acquire — Allocate PHY event context
cyg_net_eth_phy_dsr — Notify lwIP stack of PHY event
cyg_lwip_tick_to_msec — Convert eCos kernel clock ticks to millisecond count
cyg_lwip_msec_to_tick — Convert millisecond count to eCos kernel clock ticks
cyg_lwip_statistics — Statistics output
160. Configuration
160.1. Configuration Overview
160.2. Configuring the lwIP stack
160.3. Performance and Footprint Tuning
160.3.1. Performance
160.3.2. Optimizations
160.3.3. Memory Footprint
161. Sequential API
161.1. Overview
161.2. Comparison with BSD sockets
161.2.1. BSD API Restrictions
161.3. Netbufs
161.4. TCP/IP thread
161.5. Usage
161.5.1. API declarations
161.5.2. Types
161.6. API reference
netbuf_new() — Allocate a netbuf structure
netbuf_delete() — Deallocate a netbuf structure
netbuf_alloc() — Allocate space in a netbuf
netbuf_free() — Deallocate buffer memory associated with a netbuf
netbuf_ref() — Associate a data pointer with a netbuf
netbuf_len() — Obtain the total length of a netbuf
netbuf_data() — Obtain a pointer to netbuf data
netbuf_next() — Traverse internal fragments in a netbuf
netbuf_first() — Reset fragment pointer to start of netbuf
netbuf_copy() — Copy all netbuf data to memory pointer
netbuf_copy_partial() — Copy some netbuf data to memory pointer
netbuf_chain() — Chain two netbufs together
netbuf_fromaddr() — Obtain the sender's IPv4 address for a netbuf
netbuf_fromaddr_ip6() — Obtain the sender's IPv6 address for a netbuf
netbuf_fromport() — Obtain the sender's port number for a netbuf
netconn_new() — Create a new connection structure
netconn_new_with_callback() — Create a new connection structure with a callback
netconn_new_with_proto_and_callback() — Create a new connection structure with a callback for a specific protocol
netconn_delete() — Deallocate a netconn
netconn_type() — Obtain the type of netconn
netconn_peer() — Obtain the remote host IP address/port of a netconn
netconn_addr() — Obtain the local host IPv4 address/port of a netconn
netconn_bind() — Set local IP address/port of a netconn
netconn_bind_ip6() — Set local IPv6 address/port of a netconn
netconn_connect() — Connect netconn to remote peer
netconn_connect_ip6() — Connect netconn to remote peer
netconn_disconnect() — Disconnect UDP connection
netconn_listen() — Make a listening TCP netconn
netconn_accept() — Wait for incoming connections
netconn_recv() — Wait for data
netconn_recv_tcp_pbuf() — Wait for data
netconn_recved() — Update receive window
netconn_write() — Send data on TCP connection
netconn_send() — Send data on UDP connection
netconn_close() — Close a connection
netconn_shutdown() — Shutdown a connection
netconn_set_noautorecved() — Set the connection no-auto-recved state
netconn_get_noautorecved() — Get the connection no-auto-recved state
netconn_err() — Obtain connection error status
162. Raw API
162.1. Overview
162.2. Usage
162.3. Callbacks
tcp_arg() — Set the application connection state
162.4. TCP connection setup
tcp_new() — Create a new TCP PCB
tcp_bind() — Bind PCB to local IP address and port
tcp_listen() — Make PCB listen for incoming connections
tcp_accept() — Set callback used for new incoming connections
tcp_connect() — Open connection to remote host
162.5. Sending TCP data
tcp_write() — Enqueue data for transmission
tcp_sent() — Set callback for successful transmission
162.6. Receiving TCP data
tcp_recv() — Set callback for incoming data
tcp_recved() — Indicate receipt of data
162.7. Application polling
tcp_poll() — Set application poll callback
162.8. Closing connections, aborting connections and errors
tcp_close() — Close the connection
tcp_abort() — Abort the connection
tcp_err() — Set callback for errors
162.9. Lower layer TCP interface
162.10. UDP interface
udp_new() — Create a new UDP pcb
udp_remove() — Remove a UDP pcb
udp_bind() — Bind PCB to local IP address and port
udp_connect() — Set remote UDP peer
udp_disconnect() — Set remote UDP peer
udp_send() — Send UDP packet
udp_recv() — Set callback for incoming UDP data
162.11. System initialization
162.11.1. Initialization detail
163. Debug and Test
163.1. Debugging
163.1.1. Asserts
163.1.2. Memory Allocations
163.1.3. Statistics
163.1.4. GDB/RedBoot
163.1.5. Host Tools
163.2. Testing
163.2.1. lwipsnmp
163.2.2. lwipsntp
163.2.3. lwiperf
163.2.4. unitwrap
163.2.5. socket
163.2.6. tcpecho
163.2.7. udpecho
163.2.8. frag
163.2.9. nc_test_slave
163.2.10. httpd
163.2.11. httpd2
163.2.12. lookup
163.2.13. sys_timeout
163.2.14. lwiphttpd