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