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net: Untangle nested qemu_send_packet (Jan Kiszka)

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Queue packets that are send during an ongoing packet delivery. This
ensures that packets will always arrive in their logical order at each
client of a VLAN. Currently, slirp generates such immediate relies, and
e.g. packet-sniffing clients on the same VLAN may get confused.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7203 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-04-21 19:56:41 +00:00
parent a66b11bfcd
commit 764a4d1deb
2 changed files with 41 additions and 6 deletions
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36
net.c
View File

@ -403,22 +403,46 @@ int qemu_can_send_packet(VLANClientState *vc1)
return 0;
}
void qemu_send_packet(VLANClientState *vc1, const uint8_t *buf, int size)
static void
qemu_deliver_packet(VLANClientState *sender, const uint8_t *buf, int size)
{
VLANState *vlan = vc1->vlan;
VLANClientState *vc;
if (vc1->link_down)
for (vc = sender->vlan->first_client; vc != NULL; vc = vc->next) {
if (vc != sender && !vc->link_down) {
vc->fd_read(vc->opaque, buf, size);
}
}
}
void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
{
VLANState *vlan = vc->vlan;
VLANPacket *packet;
if (vc->link_down)
return;
#ifdef DEBUG_NET
printf("vlan %d send:\n", vlan->id);
hex_dump(stdout, buf, size);
#endif
for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
if (vc != vc1 && !vc->link_down) {
vc->fd_read(vc->opaque, buf, size);
if (vlan->delivering) {
packet = qemu_malloc(sizeof(VLANPacket) + size);
packet->next = vlan->send_queue;
packet->sender = vc;
packet->size = size;
memcpy(packet->data, buf, size);
vlan->send_queue = packet;
} else {
vlan->delivering = 1;
qemu_deliver_packet(vc, buf, size);
while ((packet = vlan->send_queue) != NULL) {
qemu_deliver_packet(packet->sender, packet->data, packet->size);
vlan->send_queue = packet->next;
qemu_free(packet);
}
vlan->delivering = 0;
}
}

11
net.h
View File

@ -29,11 +29,22 @@ struct VLANClientState {
char info_str[256];
};
typedef struct VLANPacket VLANPacket;
struct VLANPacket {
struct VLANPacket *next;
VLANClientState *sender;
int size;
uint8_t data[0];
};
struct VLANState {
int id;
VLANClientState *first_client;
struct VLANState *next;
unsigned int nb_guest_devs, nb_host_devs;
VLANPacket *send_queue;
int delivering;
};
VLANState *qemu_find_vlan(int id);