icmpv6.c File Reference

#include <stdint.h>
#include <string.h>
#include <byteswap.h>
#include <errno.h>
#include <gpxe/in.h>
#include <gpxe/ip6.h>
#include <gpxe/if_ether.h>
#include <gpxe/iobuf.h>
#include <gpxe/ndp.h>
#include <gpxe/icmp6.h>
#include <gpxe/tcpip.h>
#include <gpxe/netdevice.h>

Go to the source code of this file.

Functions
int	icmp6_send_solicit (struct net_device *netdev, struct in6_addr *src __unused, struct in6_addr *dest)
	Send neighbour solicitation packet.
static int	icmp6_rx (struct io_buffer *iobuf, struct sockaddr_tcpip *st_src, struct sockaddr_tcpip *st_dest, __unused uint16_t pshdr_csum)
	Process ICMP6 headers.
Variables
struct tcpip_protocol	icmp6_protocol
struct tcpip_protocol icmp6_protocol	__tcpip_protocol
	ICMP6 protocol.

---

Function Documentation

int icmp6_send_solicit	(	struct net_device *	netdev,
		struct in6_addr *src	__unused,
		struct in6_addr *	dest
	)

Send neighbour solicitation packet.

Parameters:

	netdev	Network device
	src	Source address
	dest	Destination address

This function prepares a neighbour solicitation packet and sends it to the network layer.

Definition at line 26 of file icmpv6.c.

References AF_INET6, alloc_iob(), neighbour_solicit::code, neighbour_solicit::csum, ICMP6_NSOLICIT, icmp6_protocol, in6_addr::in6_u, iob_put, iob_reserve, net_device::ll_addr, ll_protocol::ll_addr_len, net_device::ll_protocol, MAX_HDR_LEN, memcpy, memset(), MIN_IOB_LEN, NULL, neighbour_solicit::opt_len, neighbour_solicit::opt_ll_addr, neighbour_solicit::opt_type, neighbour_solicit::target, tcpip_chksum(), tcpip_tx(), neighbour_solicit::type, and in6_addr::u6_addr32.

Referenced by ndp_resolve().

                                                 {
        union {
                struct sockaddr_in6 sin6;
                struct sockaddr_tcpip st;
        } st_dest;
        struct ll_protocol *ll_protocol = netdev->ll_protocol;
        struct neighbour_solicit *nsolicit;
        struct io_buffer *iobuf = alloc_iob ( sizeof ( *nsolicit ) + MIN_IOB_LEN );
        iob_reserve ( iobuf, MAX_HDR_LEN );
        nsolicit = iob_put ( iobuf, sizeof ( *nsolicit ) );

        /* Fill up the headers */
        memset ( nsolicit, 0, sizeof ( *nsolicit ) );
        nsolicit->type = ICMP6_NSOLICIT;
        nsolicit->code = 0;
        nsolicit->target = *dest;
        nsolicit->opt_type = 1;
        nsolicit->opt_len = ( 2 + ll_protocol->ll_addr_len ) / 8;
        memcpy ( nsolicit->opt_ll_addr, netdev->ll_addr,
                                netdev->ll_protocol->ll_addr_len );
        /* Partial checksum */
        nsolicit->csum = 0;
        nsolicit->csum = tcpip_chksum ( nsolicit, sizeof ( *nsolicit ) );

        /* Solicited multicast address */
        st_dest.sin6.sin_family = AF_INET6;
        st_dest.sin6.sin6_addr.in6_u.u6_addr8[0] = 0xff;
        st_dest.sin6.sin6_addr.in6_u.u6_addr8[2] = 0x02;
        st_dest.sin6.sin6_addr.in6_u.u6_addr16[1] = 0x0000;
        st_dest.sin6.sin6_addr.in6_u.u6_addr32[1] = 0x00000000;
        st_dest.sin6.sin6_addr.in6_u.u6_addr16[4] = 0x0000;
        st_dest.sin6.sin6_addr.in6_u.u6_addr16[5] = 0x0001;
        st_dest.sin6.sin6_addr.in6_u.u6_addr32[3] = dest->in6_u.u6_addr32[3];
        st_dest.sin6.sin6_addr.in6_u.u6_addr8[13] = 0xff;
        
        /* Send packet over IP6 */
        return tcpip_tx ( iobuf, &icmp6_protocol, NULL, &st_dest.st,
                          NULL, &nsolicit->csum );
}

static int icmp6_rx	(	struct io_buffer *	iobuf,
		struct sockaddr_tcpip *	st_src,
		struct sockaddr_tcpip *	st_dest,
		__unused uint16_t	pshdr_csum
	)			[static]

Process ICMP6 headers.

Parameters:

	iobuf	I/O buffer
	st_src	Source address
	st_dest	Destination address

Definition at line 74 of file icmpv6.c.

References io_buffer::data, DBG, EINVAL, ENOSYS, free_iob(), ICMP6_NADVERT, iob_len(), ndp_process_advert(), and icmp6_header::type.

                                                                                     {
        struct icmp6_header *icmp6hdr = iobuf->data;

        /* Sanity check */
        if ( iob_len ( iobuf ) < sizeof ( *icmp6hdr ) ) {
                DBG ( "Packet too short (%zd bytes)\n", iob_len ( iobuf ) );
                free_iob ( iobuf );
                return -EINVAL;
        }

        /* TODO: Verify checksum */

        /* Process the ICMP header */
        switch ( icmp6hdr->type ) {
        case ICMP6_NADVERT:
                return ndp_process_advert ( iobuf, st_src, st_dest );
        }
        return -ENOSYS;
}

---

Variable Documentation

struct tcpip_protocol icmp6_protocol

Definition at line 14 of file icmpv6.c.

Referenced by icmp6_send_solicit().

struct tcpip_protocol icmp6_protocol __tcpip_protocol

Initial value:

 {
        .name = "ICMP6",
        .rx = icmp6_rx,
        .tcpip_proto = IP_ICMP6, 
}

ICMP6 protocol.

Definition at line 124 of file icmpv6.c.