icmp.c File Reference

ICMP. More...

#include <core/system.h>
#include <core/string.h>
#include <net/byteorder.h>
#include <net/inet.h>
#include <aquila/errno.h>

Go to the source code of this file.

Functions
static void	icmp_unreachable_input (struct netif *netif, struct icmp_hdr *icmp, size_t len)
	Handles a "destination unreachable" about a datagram we sent: the UDP socket that sent it gets the error.
void	icmp_input (struct netif *netif, struct netbuf *nb, uint32_t src, uint32_t dst)
	Takes in an ICMP message that IPv4 received.
void	icmp_unreachable (struct netif *netif, const struct ipv4_hdr *ih, int code)
	Tells the sender of a datagram that it couldn't get where it was sent.

Detailed Description

ICMP.

An echo request (a ping) is answered. An echo reply goes to the ping socket whose identifier it carries (the socket's port). A "destination unreachable" goes to the UDP socket whose datagram couldn't get there, as an error. This file also sends "unreachable" for the datagrams that arrive for no socket.

Definition in file icmp.c.

Function Documentation

icmp_input()

void icmp_input	(	struct netif *	netif,
		struct netbuf *	nb,
		uint32_t	src,
		uint32_t	dst )

Takes in an ICMP message that IPv4 received.

Parameters

netif	the interface it came in on
nb	the message, from its ICMP header; it is freed, sent back or delivered
src	the sender's address
dst	the address it was sent to

Definition at line 50 of file icmp.c.

References icmp_hdr::checksum, icmp_hdr::code, netbuf::data, ICMP_ECHO_REPLY, ICMP_ECHO_REQUEST, icmp_input(), ICMP_UNREACH, icmp_unreachable_input(), icmp_hdr::id, inet_checksum(), inet_sock_deliver(), inet_sock_find(), IP_PROTO_ICMP, ipv4_is_local(), ipv4_output(), netbuf::len, netbuf_free(), netbuf::src_ip, netbuf::src_port, netif::stats, and icmp_hdr::type.

Referenced by icmp_input(), and ipv4_input().

icmp_unreachable()

void icmp_unreachable	(	struct netif *	netif,
		const struct ipv4_hdr *	ih,
		int	code )

Tells the sender of a datagram that it couldn't get where it was sent.

Parameters

netif	the interface the datagram came in on
ih	the datagram's IPv4 header, with its payload after it
code	why (ICMP_UNREACH_*)

Definition at line 105 of file icmp.c.

References icmp_hdr::checksum, icmp_hdr::code, ICMP_UNREACH, icmp_unreachable(), icmp_hdr::id, inet_checksum(), IP_PROTO_ICMP, ipv4_output(), ipv4_hdr::len, memcpy(), netbuf_alloc(), ntohs, icmp_hdr::seq, ipv4_hdr::src, icmp_hdr::type, and ipv4_hdr::ver_ihl.

Referenced by icmp_unreachable(), ipv4_input(), and udp_input().

icmp_unreachable_input()

void icmp_unreachable_input ( struct netif * netif, struct icmp_hdr * icmp, size_t len )

static

Handles a "destination unreachable" about a datagram we sent: the UDP socket that sent it gets the error.

Definition at line 20 of file icmp.c.

References icmp_hdr::code, ipv4_hdr::dst, udp_hdr::dst, ICMP_UNREACH_PORT, icmp_unreachable_input(), inet_sock_error(), inet_sock_find(), IP_PROTO_UDP, ipv4_hdr::len, ipv4_hdr::proto, ipv4_hdr::src, udp_hdr::src, and ipv4_hdr::ver_ihl.

Referenced by icmp_input(), and icmp_unreachable_input().