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net/colo.c: Fix the pointer issue reported by Coverity.

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When enabled the virtio-net-pci, guest network packet will
load the vnet_hdr. In COLO status, the primary VM's network
packet maybe redirect to another VM, it needs filter-redirect
enable the vnet_hdr flag at the same time, COLO-proxy will
correctly parse the original network packet. If have any
misconfiguration here, the vnet_hdr_len is wrong for parse
the packet, the data+offset will point to wrong place.

Signed-off-by: Zhang Chen <chen.zhang@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Zhang Chen 2022-08-22 16:14:36 +08:00 committed by Jason Wang
parent 0e3fdcffea
commit 3772cf0d1b
3 changed files with 18 additions and 10 deletions
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25
net/colo.c
View file

@ -44,21 +44,28 @@ int parse_packet_early(Packet *pkt)
{
int network_length;
static const uint8_t vlan[] = {0x81, 0x00};
uint8_t *data = pkt->data + pkt->vnet_hdr_len;
uint8_t *data = pkt->data;
uint16_t l3_proto;
ssize_t l2hdr_len;
if (data == NULL) {
trace_colo_proxy_main_vnet_info("This packet is not parsed correctly, "
"pkt->vnet_hdr_len", pkt->vnet_hdr_len);
return 1;
}
l2hdr_len = eth_get_l2_hdr_length(data);
assert(data);
if (pkt->size < ETH_HLEN + pkt->vnet_hdr_len) {
trace_colo_proxy_main("pkt->size < ETH_HLEN");
/* Check the received vnet_hdr_len then add the offset */
if ((pkt->vnet_hdr_len > sizeof(struct virtio_net_hdr_v1_hash)) ||
(pkt->size < sizeof(struct eth_header) + sizeof(struct vlan_header) +
pkt->vnet_hdr_len)) {
/*
* The received remote packet maybe misconfiguration here,
* Please enable/disable filter module's the vnet_hdr flag at
* the same time.
*/
trace_colo_proxy_main_vnet_info("This received packet load wrong ",
pkt->vnet_hdr_len, pkt->size);
return 1;
}
data += pkt->vnet_hdr_len;
l2hdr_len = eth_get_l2_hdr_length(data);
/*
* TODO: support vlan.

1
net/colo.h
View file

@ -18,6 +18,7 @@
#include "qemu/jhash.h"
#include "qemu/timer.h"
#include "net/eth.h"
#include "standard-headers/linux/virtio_net.h"
#define HASHTABLE_MAX_SIZE 16384

2
net/trace-events
View file

@ -9,7 +9,7 @@ vhost_user_event(const char *chr, int event) "chr: %s got event: %d"
# colo.c
colo_proxy_main(const char *chr) ": %s"
colo_proxy_main_vnet_info(const char *sta, int size) ": %s = %d"
colo_proxy_main_vnet_info(const char *sta, uint32_t vnet_hdr, int size) ": %s pkt->vnet_hdr_len = %u, pkt->size = %d"
# colo-compare.c
colo_compare_main(const char *chr) ": %s"