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author | Mao Zhongyi <maozy.fnst@cn.fujitsu.com> | 2017-12-25 10:54:11 +0800 |
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committer | Jason Wang <jasowang@redhat.com> | 2018-01-29 16:05:37 +0800 |
commit | 9394133f8678ea02bbabab11c8e89e576ec8e9e8 (patch) | |
tree | 991b707f1381ca83b54562f3a34764c24f998172 /net/colo-compare.c | |
parent | e607bbee553cfe73072870cef458cfa4e78133e2 (diff) | |
download | qemu-9394133f8678ea02bbabab11c8e89e576ec8e9e8.zip qemu-9394133f8678ea02bbabab11c8e89e576ec8e9e8.tar.gz qemu-9394133f8678ea02bbabab11c8e89e576ec8e9e8.tar.bz2 |
colo: modified the payload compare function
Modified the function colo_packet_compare_common to prepare for the
tcp packet comparison in the next patch.
Cc: Zhang Chen <zhangckid@gmail.com>
Cc: Li Zhijian <lizhijian@cn.fujitsu.com>
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Mao Zhongyi <maozy.fnst@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Zhang Chen <zhangckid@gmail.com>
Reviewed-by: Zhang Chen <zhangckid@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'net/colo-compare.c')
-rw-r--r-- | net/colo-compare.c | 88 |
1 files changed, 44 insertions, 44 deletions
diff --git a/net/colo-compare.c b/net/colo-compare.c index 0ebdec9..f39ca02 100644 --- a/net/colo-compare.c +++ b/net/colo-compare.c @@ -190,10 +190,12 @@ static int packet_enqueue(CompareState *s, int mode, Connection **con) * return: 0 means packet same * > 0 || < 0 means packet different */ -static int colo_packet_compare_common(Packet *ppkt, - Packet *spkt, - int poffset, - int soffset) +static int colo_compare_packet_payload(Packet *ppkt, + Packet *spkt, + uint16_t poffset, + uint16_t soffset, + uint16_t len) + { if (trace_event_get_state_backends(TRACE_COLO_COMPARE_MISCOMPARE)) { char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; @@ -208,17 +210,7 @@ static int colo_packet_compare_common(Packet *ppkt, sec_ip_src, sec_ip_dst); } - poffset = ppkt->vnet_hdr_len + poffset; - soffset = ppkt->vnet_hdr_len + soffset; - - if (ppkt->size - poffset == spkt->size - soffset) { - return memcmp(ppkt->data + poffset, - spkt->data + soffset, - spkt->size - soffset); - } else { - trace_colo_compare_main("Net packet size are not the same"); - return -1; - } + return memcmp(ppkt->data + poffset, spkt->data + soffset, len); } /* @@ -270,24 +262,19 @@ static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt) * the secondary guest's timestamp. COLO just focus on payload, * so we just need skip this field. */ - if (ptcp->th_off > 5) { - ptrdiff_t ptcp_offset, stcp_offset; - ptcp_offset = ppkt->transport_header - (uint8_t *)ppkt->data - + (ptcp->th_off * 4) - ppkt->vnet_hdr_len; - stcp_offset = spkt->transport_header - (uint8_t *)spkt->data - + (stcp->th_off * 4) - spkt->vnet_hdr_len; + ptrdiff_t ptcp_offset, stcp_offset; - /* - * When network is busy, some tcp options(like sack) will unpredictable - * occur in primary side or secondary side. it will make packet size - * not same, but the two packet's payload is identical. colo just - * care about packet payload, so we skip the option field. - */ - res = colo_packet_compare_common(ppkt, spkt, ptcp_offset, stcp_offset); - } else if (ptcp->th_sum == stcp->th_sum) { - res = colo_packet_compare_common(ppkt, spkt, ETH_HLEN, ETH_HLEN); + ptcp_offset = ppkt->transport_header - (uint8_t *)ppkt->data + + (ptcp->th_off << 2) - ppkt->vnet_hdr_len; + stcp_offset = spkt->transport_header - (uint8_t *)spkt->data + + (stcp->th_off << 2) - spkt->vnet_hdr_len; + if (ppkt->size - ptcp_offset == spkt->size - stcp_offset) { + res = colo_compare_packet_payload(ppkt, spkt, + ptcp_offset, stcp_offset, + ppkt->size - ptcp_offset); } else { + trace_colo_compare_main("TCP: payload size of packets are different"); res = -1; } @@ -331,8 +318,8 @@ static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt) */ static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) { - int ret; - int network_header_length = ppkt->ip->ip_hl * 4; + uint16_t network_header_length = ppkt->ip->ip_hl << 2; + uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; trace_colo_compare_main("compare udp"); @@ -346,11 +333,12 @@ static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) * other field like TOS,TTL,IP Checksum. we only need to compare * the ip payload here. */ - ret = colo_packet_compare_common(ppkt, spkt, - network_header_length + ETH_HLEN, - network_header_length + ETH_HLEN); - - if (ret) { + if (ppkt->size != spkt->size) { + trace_colo_compare_main("UDP: payload size of packets are different"); + return -1; + } + if (colo_compare_packet_payload(ppkt, spkt, offset, offset, + ppkt->size - offset)) { trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); if (trace_event_get_state_backends(TRACE_COLO_COMPARE_MISCOMPARE)) { @@ -359,9 +347,10 @@ static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", spkt->size); } + return -1; + } else { + return 0; } - - return ret; } /* @@ -370,7 +359,8 @@ static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) */ static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) { - int network_header_length = ppkt->ip->ip_hl * 4; + uint16_t network_header_length = ppkt->ip->ip_hl << 2; + uint16_t offset = network_header_length + ETH_HLEN + ppkt->vnet_hdr_len; trace_colo_compare_main("compare icmp"); @@ -384,9 +374,12 @@ static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) * other field like TOS,TTL,IP Checksum. we only need to compare * the ip payload here. */ - if (colo_packet_compare_common(ppkt, spkt, - network_header_length + ETH_HLEN, - network_header_length + ETH_HLEN)) { + if (ppkt->size != spkt->size) { + trace_colo_compare_main("ICMP: payload size of packets are different"); + return -1; + } + if (colo_compare_packet_payload(ppkt, spkt, offset, offset, + ppkt->size - offset)) { trace_colo_compare_icmp_miscompare("primary pkt size", ppkt->size); trace_colo_compare_icmp_miscompare("Secondary pkt size", @@ -409,6 +402,8 @@ static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) */ static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) { + uint16_t offset = ppkt->vnet_hdr_len; + trace_colo_compare_main("compare other"); if (trace_event_get_state_backends(TRACE_COLO_COMPARE_MISCOMPARE)) { char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; @@ -423,7 +418,12 @@ static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) sec_ip_src, sec_ip_dst); } - return colo_packet_compare_common(ppkt, spkt, 0, 0); + if (ppkt->size != spkt->size) { + trace_colo_compare_main("Other: payload size of packets are different"); + return -1; + } + return colo_compare_packet_payload(ppkt, spkt, offset, offset, + ppkt->size - offset); } static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) |