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colo-compare: add TCP, UDP, ICMP packet comparison

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We add TCP,UDP,ICMP packet comparison to replace
IP packet comparison. This can increase the
accuracy of the package comparison.
Less checkpoint more efficiency.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Zhang Chen 2016-09-27 10:22:31 +08:00 committed by Jason Wang
parent 0682e15b19
commit f4b618360e
2 changed files with 146 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

147
net/colo-compare.c
View File

@ -19,6 +19,7 @@
#include "qapi/qmp/qerror.h"
#include "qapi/error.h"
#include "net/net.h"
#include "net/eth.h"
#include "qom/object_interfaces.h"
#include "qemu/iov.h"
#include "qom/object.h"
@ -178,9 +179,131 @@ static int colo_packet_compare(Packet *ppkt, Packet *spkt)
}
}
static int colo_packet_compare_all(Packet *spkt, Packet *ppkt)
/*
* Called from the compare thread on the primary
* for compare tcp packet
* compare_tcp copied from Dr. David Alan Gilbert's branch
*/
static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt)
{
trace_colo_compare_main("compare all");
struct tcphdr *ptcp, *stcp;
int res;
char *sdebug, *ddebug;
trace_colo_compare_main("compare tcp");
if (ppkt->size != spkt->size) {
if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) {
trace_colo_compare_main("pkt size not same");
}
return -1;
}
ptcp = (struct tcphdr *)ppkt->transport_header;
stcp = (struct tcphdr *)spkt->transport_header;
/*
* The 'identification' field in the IP header is *very* random
* it almost never matches. Fudge this by ignoring differences in
* unfragmented packets; they'll normally sort themselves out if different
* anyway, and it should recover at the TCP level.
* An alternative would be to get both the primary and secondary to rewrite
* somehow; but that would need some sync traffic to sync the state
*/
if (ntohs(ppkt->ip->ip_off) & IP_DF) {
spkt->ip->ip_id = ppkt->ip->ip_id;
/* and the sum will be different if the IDs were different */
spkt->ip->ip_sum = ppkt->ip->ip_sum;
}
res = memcmp(ppkt->data + ETH_HLEN, spkt->data + ETH_HLEN,
(spkt->size - ETH_HLEN));
if (res != 0 && trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) {
sdebug = strdup(inet_ntoa(ppkt->ip->ip_src));
ddebug = strdup(inet_ntoa(ppkt->ip->ip_dst));
fprintf(stderr, "%s: src/dst: %s/%s p: seq/ack=%u/%u"
" s: seq/ack=%u/%u res=%d flags=%x/%x\n",
__func__, sdebug, ddebug,
(unsigned int)ntohl(ptcp->th_seq),
(unsigned int)ntohl(ptcp->th_ack),
(unsigned int)ntohl(stcp->th_seq),
(unsigned int)ntohl(stcp->th_ack),
res, ptcp->th_flags, stcp->th_flags);
fprintf(stderr, "Primary len = %d\n", ppkt->size);
qemu_hexdump((char *)ppkt->data, stderr, "colo-compare", ppkt->size);
fprintf(stderr, "Secondary len = %d\n", spkt->size);
qemu_hexdump((char *)spkt->data, stderr, "colo-compare", spkt->size);
g_free(sdebug);
g_free(ddebug);
}
return res;
}
/*
* Called from the compare thread on the primary
* for compare udp packet
*/
static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt)
{
int ret;
trace_colo_compare_main("compare udp");
ret = colo_packet_compare(ppkt, spkt);
if (ret) {
trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size);
qemu_hexdump((char *)ppkt->data, stderr, "colo-compare", ppkt->size);
trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size);
qemu_hexdump((char *)spkt->data, stderr, "colo-compare", spkt->size);
}
return ret;
}
/*
* Called from the compare thread on the primary
* for compare icmp packet
*/
static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt)
{
int network_length;
trace_colo_compare_main("compare icmp");
network_length = ppkt->ip->ip_hl * 4;
if (ppkt->size != spkt->size ||
ppkt->size < network_length + ETH_HLEN) {
return -1;
}
if (colo_packet_compare(ppkt, spkt)) {
trace_colo_compare_icmp_miscompare("primary pkt size",
ppkt->size);
qemu_hexdump((char *)ppkt->data, stderr, "colo-compare",
ppkt->size);
trace_colo_compare_icmp_miscompare("Secondary pkt size",
spkt->size);
qemu_hexdump((char *)spkt->data, stderr, "colo-compare",
spkt->size);
return -1;
} else {
return 0;
}
}
/*
* Called from the compare thread on the primary
* for compare other packet
*/
static int colo_packet_compare_other(Packet *spkt, Packet *ppkt)
{
trace_colo_compare_main("compare other");
trace_colo_compare_ip_info(ppkt->size, inet_ntoa(ppkt->ip->ip_src),
inet_ntoa(ppkt->ip->ip_dst), spkt->size,
inet_ntoa(spkt->ip->ip_src),
inet_ntoa(spkt->ip->ip_dst));
return colo_packet_compare(ppkt, spkt);
}
@ -242,8 +365,24 @@ static void colo_compare_connection(void *opaque, void *user_data)
qemu_mutex_lock(&s->timer_check_lock);
pkt = g_queue_pop_tail(&conn->primary_list);
qemu_mutex_unlock(&s->timer_check_lock);
result = g_queue_find_custom(&conn->secondary_list,
pkt, (GCompareFunc)colo_packet_compare_all);
switch (conn->ip_proto) {
case IPPROTO_TCP:
result = g_queue_find_custom(&conn->secondary_list,
pkt, (GCompareFunc)colo_packet_compare_tcp);
break;
case IPPROTO_UDP:
result = g_queue_find_custom(&conn->secondary_list,
pkt, (GCompareFunc)colo_packet_compare_udp);
break;
case IPPROTO_ICMP:
result = g_queue_find_custom(&conn->secondary_list,
pkt, (GCompareFunc)colo_packet_compare_icmp);
break;
default:
result = g_queue_find_custom(&conn->secondary_list,
pkt, (GCompareFunc)colo_packet_compare_other);
break;
}
if (result) {
ret = compare_chr_send(s->chr_out, pkt->data, pkt->size);

3
trace-events
View File

@ -144,8 +144,11 @@ colo_proxy_main(const char *chr) ": %s"
# net/colo-compare.c
colo_compare_main(const char *chr) ": %s"
colo_compare_udp_miscompare(const char *sta, int size) ": %s = %d"
colo_compare_icmp_miscompare(const char *sta, int size) ": %s = %d"
colo_compare_ip_info(int psize, const char *sta, const char *stb, int ssize, const char *stc, const char *std) "ppkt size = %d, ip_src = %s, ip_dst = %s, spkt size = %d, ip_src = %s, ip_dst = %s"
colo_old_packet_check_found(int64_t old_time) "%" PRId64
colo_compare_miscompare(void) ""
### Guest events, keep at bottom