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c0942408b7
FCoE requires the use of multiple local unicast link-layer addresses. To avoid the complexity of managing multiple addresses, iPXE operates in promiscuous mode. As a consequence, any unicast packets with non-matching IPv4 addresses are rejected at the IPv4 layer (rather than at the link layer). This can cause problems when issuing a second DHCP request: if the address chosen by the DHCP server does not match the existing address, then the DHCP response will itself be rejected. Fix by requesting a broadcast response from the DHCP server if the network interface already has any IPv4 addresses. Signed-off-by: Michael Brown <mcb30@ipxe.org>
92 lines
1.7 KiB
C
92 lines
1.7 KiB
C
#ifndef _IPXE_IP_H
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#define _IPXE_IP_H
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/** @file
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*
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* IP protocol
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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#include <ipxe/in.h>
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#include <ipxe/list.h>
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#include <ipxe/retry.h>
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#include <ipxe/netdevice.h>
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struct io_buffer;
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/* IP constants */
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#define IP_VER 0x40U
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#define IP_MASK_VER 0xf0U
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#define IP_MASK_HLEN 0x0fU
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#define IP_MASK_OFFSET 0x1fffU
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#define IP_MASK_DONOTFRAG 0x4000U
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#define IP_MASK_MOREFRAGS 0x2000U
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#define IP_PSHLEN 12
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/* IP header defaults */
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#define IP_TOS 0
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#define IP_TTL 64
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/** An IPv4 packet header */
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struct iphdr {
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uint8_t verhdrlen;
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uint8_t service;
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uint16_t len;
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uint16_t ident;
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uint16_t frags;
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uint8_t ttl;
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uint8_t protocol;
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uint16_t chksum;
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struct in_addr src;
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struct in_addr dest;
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} __attribute__ (( packed ));
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/** An IPv4 pseudo header */
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struct ipv4_pseudo_header {
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struct in_addr src;
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struct in_addr dest;
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uint8_t zero_padding;
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uint8_t protocol;
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uint16_t len;
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};
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/** An IPv4 address/routing table entry */
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struct ipv4_miniroute {
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/** List of miniroutes */
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struct list_head list;
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/** Network device */
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struct net_device *netdev;
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/** IPv4 address */
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struct in_addr address;
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/** Subnet mask */
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struct in_addr netmask;
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/** Gateway address */
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struct in_addr gateway;
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};
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/* IPv4 fragment reassembly buffer */
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struct ipv4_fragment {
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/* List of fragment reassembly buffers */
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struct list_head list;
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/** Reassembled packet */
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struct io_buffer *iobuf;
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/** Current offset */
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size_t offset;
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/** Reassembly timer */
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struct retry_timer timer;
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};
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extern struct list_head ipv4_miniroutes;
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extern struct net_protocol ipv4_protocol __net_protocol;
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extern int ipv4_has_any_addr ( struct net_device *netdev );
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#endif /* _IPXE_IP_H */
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