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![Zhang Chen](/assets/img/avatar_default.png)
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>
253 lines
6.6 KiB
C
253 lines
6.6 KiB
C
/*
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* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
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* (a.k.a. Fault Tolerance or Continuous Replication)
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*
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* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
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* Copyright (c) 2016 FUJITSU LIMITED
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* Copyright (c) 2016 Intel Corporation
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*
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* Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "trace.h"
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#include "colo.h"
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#include "util.h"
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uint32_t connection_key_hash(const void *opaque)
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{
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const ConnectionKey *key = opaque;
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uint32_t a, b, c;
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/* Jenkins hash */
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a = b = c = JHASH_INITVAL + sizeof(*key);
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a += key->src.s_addr;
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b += key->dst.s_addr;
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c += (key->src_port | key->dst_port << 16);
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__jhash_mix(a, b, c);
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a += key->ip_proto;
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__jhash_final(a, b, c);
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return c;
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}
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int connection_key_equal(const void *key1, const void *key2)
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{
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return memcmp(key1, key2, sizeof(ConnectionKey)) == 0;
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}
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int parse_packet_early(Packet *pkt)
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{
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int network_length;
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static const uint8_t vlan[] = {0x81, 0x00};
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uint8_t *data = pkt->data;
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uint16_t l3_proto;
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ssize_t l2hdr_len;
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assert(data);
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/* Check the received vnet_hdr_len then add the offset */
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if ((pkt->vnet_hdr_len > sizeof(struct virtio_net_hdr_v1_hash)) ||
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(pkt->size < sizeof(struct eth_header) + sizeof(struct vlan_header) +
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pkt->vnet_hdr_len)) {
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/*
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* The received remote packet maybe misconfiguration here,
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* Please enable/disable filter module's the vnet_hdr flag at
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* the same time.
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*/
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trace_colo_proxy_main_vnet_info("This received packet load wrong ",
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pkt->vnet_hdr_len, pkt->size);
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return 1;
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}
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data += pkt->vnet_hdr_len;
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l2hdr_len = eth_get_l2_hdr_length(data);
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/*
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* TODO: support vlan.
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*/
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if (!memcmp(&data[12], vlan, sizeof(vlan))) {
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trace_colo_proxy_main("COLO-proxy don't support vlan");
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return 1;
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}
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pkt->network_header = data + l2hdr_len;
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const struct iovec l2vec = {
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.iov_base = (void *) data,
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.iov_len = l2hdr_len
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};
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l3_proto = eth_get_l3_proto(&l2vec, 1, l2hdr_len);
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if (l3_proto != ETH_P_IP) {
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return 1;
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}
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network_length = pkt->ip->ip_hl * 4;
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if (pkt->size < l2hdr_len + network_length + pkt->vnet_hdr_len) {
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trace_colo_proxy_main("pkt->size < network_header + network_length");
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return 1;
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}
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pkt->transport_header = pkt->network_header + network_length;
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return 0;
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}
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void extract_ip_and_port(uint32_t tmp_ports, ConnectionKey *key,
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Packet *pkt, bool reverse)
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{
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if (reverse) {
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key->src = pkt->ip->ip_dst;
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key->dst = pkt->ip->ip_src;
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key->src_port = ntohs(tmp_ports & 0xffff);
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key->dst_port = ntohs(tmp_ports >> 16);
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} else {
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key->src = pkt->ip->ip_src;
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key->dst = pkt->ip->ip_dst;
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key->src_port = ntohs(tmp_ports >> 16);
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key->dst_port = ntohs(tmp_ports & 0xffff);
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}
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}
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void fill_connection_key(Packet *pkt, ConnectionKey *key, bool reverse)
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{
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uint32_t tmp_ports = 0;
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key->ip_proto = pkt->ip->ip_p;
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switch (key->ip_proto) {
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case IPPROTO_TCP:
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case IPPROTO_UDP:
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case IPPROTO_DCCP:
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case IPPROTO_ESP:
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case IPPROTO_SCTP:
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case IPPROTO_UDPLITE:
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tmp_ports = *(uint32_t *)(pkt->transport_header);
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break;
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case IPPROTO_AH:
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tmp_ports = *(uint32_t *)(pkt->transport_header + 4);
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break;
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default:
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break;
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}
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extract_ip_and_port(tmp_ports, key, pkt, reverse);
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}
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Connection *connection_new(ConnectionKey *key)
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{
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Connection *conn = g_slice_new0(Connection);
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conn->ip_proto = key->ip_proto;
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conn->processing = false;
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conn->tcp_state = TCPS_CLOSED;
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g_queue_init(&conn->primary_list);
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g_queue_init(&conn->secondary_list);
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return conn;
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}
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void connection_destroy(void *opaque)
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{
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Connection *conn = opaque;
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g_queue_foreach(&conn->primary_list, packet_destroy, NULL);
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g_queue_clear(&conn->primary_list);
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g_queue_foreach(&conn->secondary_list, packet_destroy, NULL);
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g_queue_clear(&conn->secondary_list);
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g_slice_free(Connection, conn);
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}
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Packet *packet_new(const void *data, int size, int vnet_hdr_len)
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{
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Packet *pkt = g_slice_new0(Packet);
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pkt->data = g_memdup(data, size);
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pkt->size = size;
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pkt->creation_ms = qemu_clock_get_ms(QEMU_CLOCK_HOST);
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pkt->vnet_hdr_len = vnet_hdr_len;
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return pkt;
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}
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/*
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* packet_new_nocopy will not copy data, so the caller can't release
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* the data. And it will be released in packet_destroy.
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*/
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Packet *packet_new_nocopy(void *data, int size, int vnet_hdr_len)
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{
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Packet *pkt = g_slice_new0(Packet);
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pkt->data = data;
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pkt->size = size;
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pkt->creation_ms = qemu_clock_get_ms(QEMU_CLOCK_HOST);
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pkt->vnet_hdr_len = vnet_hdr_len;
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return pkt;
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}
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void packet_destroy(void *opaque, void *user_data)
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{
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Packet *pkt = opaque;
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g_free(pkt->data);
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g_slice_free(Packet, pkt);
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}
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void packet_destroy_partial(void *opaque, void *user_data)
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{
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Packet *pkt = opaque;
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g_slice_free(Packet, pkt);
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}
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/*
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* Clear hashtable, stop this hash growing really huge
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*/
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void connection_hashtable_reset(GHashTable *connection_track_table)
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{
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g_hash_table_remove_all(connection_track_table);
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}
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/* if not found, create a new connection and add to hash table */
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Connection *connection_get(GHashTable *connection_track_table,
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ConnectionKey *key,
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GQueue *conn_list)
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{
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Connection *conn = g_hash_table_lookup(connection_track_table, key);
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if (conn == NULL) {
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ConnectionKey *new_key = g_memdup(key, sizeof(*key));
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conn = connection_new(key);
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if (g_hash_table_size(connection_track_table) > HASHTABLE_MAX_SIZE) {
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trace_colo_proxy_main("colo proxy connection hashtable full,"
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" clear it");
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connection_hashtable_reset(connection_track_table);
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/*
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* clear the conn_list
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*/
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while (conn_list && !g_queue_is_empty(conn_list)) {
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connection_destroy(g_queue_pop_head(conn_list));
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}
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}
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g_hash_table_insert(connection_track_table, new_key, conn);
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}
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return conn;
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}
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bool connection_has_tracked(GHashTable *connection_track_table,
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ConnectionKey *key)
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{
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Connection *conn = g_hash_table_lookup(connection_track_table, key);
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return conn ? true : false;
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}
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