diff options
| -rw-r--r-- | savevm.c | 46 |
1 files changed, 30 insertions, 16 deletions
@@ -96,25 +96,37 @@ static BlockDriverState *bs_snapshots; #define SELF_ANNOUNCE_ROUNDS 5 -#define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */ -//#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */ -#define EXPERIMENTAL_MAGIC 0xf1f23f4f -static int announce_self_create(uint8_t *buf, +#ifndef ETH_P_RARP +#define ETH_P_RARP 0x0835 +#endif +#define ARP_HTYPE_ETH 0x0001 +#define ARP_PTYPE_IP 0x0800 +#define ARP_OP_REQUEST_REV 0x3 + +static int announce_self_create(uint8_t *buf, uint8_t *mac_addr) { - uint32_t magic = EXPERIMENTAL_MAGIC; - uint16_t proto = htons(ETH_P_EXPERIMENTAL); + /* Ethernet header. */ + memset(buf, 0xff, 6); /* destination MAC addr */ + memcpy(buf + 6, mac_addr, 6); /* source MAC addr */ + *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */ - /* FIXME: should we send a different packet (arp/rarp/ping)? */ + /* RARP header. */ + *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */ + *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */ + *(buf + 18) = 6; /* hardware addr length (ethernet) */ + *(buf + 19) = 4; /* protocol addr length (IPv4) */ + *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */ + memcpy(buf + 22, mac_addr, 6); /* source hw addr */ + memset(buf + 28, 0x00, 4); /* source protocol addr */ + memcpy(buf + 32, mac_addr, 6); /* target hw addr */ + memset(buf + 38, 0x00, 4); /* target protocol addr */ - memset(buf, 0, 64); - memset(buf, 0xff, 6); /* h_dst */ - memcpy(buf + 6, mac_addr, 6); /* h_src */ - memcpy(buf + 12, &proto, 2); /* h_proto */ - memcpy(buf + 14, &magic, 4); /* magic */ + /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */ + memset(buf + 42, 0x00, 18); - return 64; /* len */ + return 60; /* len (FCS will be added by hardware) */ } static void qemu_announce_self_once(void *opaque) @@ -122,7 +134,7 @@ static void qemu_announce_self_once(void *opaque) int i, len; VLANState *vlan; VLANClientState *vc; - uint8_t buf[256]; + uint8_t buf[60]; static int count = SELF_ANNOUNCE_ROUNDS; QEMUTimer *timer = *(QEMUTimer **)opaque; @@ -135,8 +147,10 @@ static void qemu_announce_self_once(void *opaque) vc->receive(vc, buf, len); } } - if (count--) { - qemu_mod_timer(timer, qemu_get_clock(rt_clock) + 100); + if (--count) { + /* delay 50ms, 150ms, 250ms, ... */ + qemu_mod_timer(timer, qemu_get_clock(rt_clock) + + 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100); } else { qemu_del_timer(timer); qemu_free_timer(timer); |