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Simple ARP table

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This patch adds a simple ARP table in Slirp and also adds handling of
gratuitous ARP requests.

Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
This commit is contained in:
Fabien Chouteau 2011-08-03 12:52:54 +02:00 • committed by Jan Kiszka
parent bafc72ab01
commit 1a0ca1e1f6
5 changed files with 169 additions and 59 deletions
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47
slirp/slirp.h
View file

@ -170,6 +170,48 @@ int inet_aton(const char *cp, struct in_addr *ia);
/* osdep.c */
int qemu_socket(int domain, int type, int protocol);
#define ETH_ALEN 6
#define ETH_HLEN 14
#define ETH_P_IP 0x0800 /* Internet Protocol packet */
#define ETH_P_ARP 0x0806 /* Address Resolution packet */
#define ARPOP_REQUEST 1 /* ARP request */
#define ARPOP_REPLY 2 /* ARP reply */
struct ethhdr {
unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
unsigned char h_source[ETH_ALEN]; /* source ether addr */
unsigned short h_proto; /* packet type ID field */
};
struct arphdr {
unsigned short ar_hrd; /* format of hardware address */
unsigned short ar_pro; /* format of protocol address */
unsigned char ar_hln; /* length of hardware address */
unsigned char ar_pln; /* length of protocol address */
unsigned short ar_op; /* ARP opcode (command) */
/*
* Ethernet looks like this : This bit is variable sized however...
*/
unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
uint32_t ar_sip; /* sender IP address */
unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
uint32_t ar_tip; /* target IP address */
} __attribute__((packed));
#define ARP_TABLE_SIZE 16
typedef struct ArpTable {
struct arphdr table[ARP_TABLE_SIZE];
int next_victim;
} ArpTable;
void arp_table_add(Slirp *slirp, int ip_addr, uint8_t ethaddr[ETH_ALEN]);
bool arp_table_search(Slirp *slirp, int in_ip_addr,
uint8_t out_ethaddr[ETH_ALEN]);
struct Slirp {
QTAILQ_ENTRY(Slirp) entry;
@ -181,9 +223,6 @@ struct Slirp {
struct in_addr vdhcp_startaddr;
struct in_addr vnameserver_addr;
/* ARP cache for the guest IP addresses (XXX: allow many entries) */
uint8_t client_ethaddr[6];
struct in_addr client_ipaddr;
char client_hostname[33];
@ -227,6 +266,8 @@ struct Slirp {
char *tftp_prefix;
struct tftp_session tftp_sessions[TFTP_SESSIONS_MAX];
ArpTable arp_table;
void *opaque;
};