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https://github.com/openvswitch/ovs
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c97fb13280
Following this commit, "struct odp_flow_stats" is only used in Linux-specific parts of OVS userspace code. This allows the actual Linux datapath interface to evolve more freely. Reviewed by Justin Pettit.
464 lines
14 KiB
C
464 lines
14 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include "flow.h"
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#include <inttypes.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include <string.h>
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#include "byte-order.h"
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#include "coverage.h"
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#include "dpif.h"
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#include "dynamic-string.h"
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#include "hash.h"
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#include "ofpbuf.h"
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#include "openflow/openflow.h"
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#include "openvswitch/datapath-protocol.h"
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#include "packets.h"
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#include "unaligned.h"
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#include "vlog.h"
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VLOG_DEFINE_THIS_MODULE(flow);
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COVERAGE_DEFINE(flow_extract);
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static struct arp_eth_header *
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pull_arp(struct ofpbuf *packet)
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{
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return ofpbuf_try_pull(packet, ARP_ETH_HEADER_LEN);
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}
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static struct ip_header *
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pull_ip(struct ofpbuf *packet)
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{
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if (packet->size >= IP_HEADER_LEN) {
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struct ip_header *ip = packet->data;
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int ip_len = IP_IHL(ip->ip_ihl_ver) * 4;
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if (ip_len >= IP_HEADER_LEN && packet->size >= ip_len) {
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return ofpbuf_pull(packet, ip_len);
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}
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}
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return NULL;
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}
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static struct tcp_header *
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pull_tcp(struct ofpbuf *packet)
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{
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if (packet->size >= TCP_HEADER_LEN) {
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struct tcp_header *tcp = packet->data;
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int tcp_len = TCP_OFFSET(tcp->tcp_ctl) * 4;
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if (tcp_len >= TCP_HEADER_LEN && packet->size >= tcp_len) {
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return ofpbuf_pull(packet, tcp_len);
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}
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}
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return NULL;
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}
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static struct udp_header *
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pull_udp(struct ofpbuf *packet)
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{
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return ofpbuf_try_pull(packet, UDP_HEADER_LEN);
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}
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static struct icmp_header *
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pull_icmp(struct ofpbuf *packet)
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{
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return ofpbuf_try_pull(packet, ICMP_HEADER_LEN);
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}
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static void
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parse_vlan(struct ofpbuf *b, struct flow *flow)
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{
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struct qtag_prefix {
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ovs_be16 eth_type; /* ETH_TYPE_VLAN */
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ovs_be16 tci;
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};
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if (b->size >= sizeof(struct qtag_prefix) + sizeof(ovs_be16)) {
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struct qtag_prefix *qp = ofpbuf_pull(b, sizeof *qp);
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flow->vlan_tci = qp->tci | htons(VLAN_CFI);
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}
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}
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static ovs_be16
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parse_ethertype(struct ofpbuf *b)
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{
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struct llc_snap_header *llc;
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ovs_be16 proto;
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proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto);
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if (ntohs(proto) >= ETH_TYPE_MIN) {
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return proto;
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}
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if (b->size < sizeof *llc) {
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return htons(FLOW_DL_TYPE_NONE);
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}
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llc = b->data;
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if (llc->llc.llc_dsap != LLC_DSAP_SNAP
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|| llc->llc.llc_ssap != LLC_SSAP_SNAP
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|| llc->llc.llc_cntl != LLC_CNTL_SNAP
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|| memcmp(llc->snap.snap_org, SNAP_ORG_ETHERNET,
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sizeof llc->snap.snap_org)) {
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return htons(FLOW_DL_TYPE_NONE);
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}
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ofpbuf_pull(b, sizeof *llc);
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return llc->snap.snap_type;
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}
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/* Initializes 'flow' members from 'packet', 'tun_id', and 'in_port.
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* Initializes 'packet' header pointers as follows:
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*
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* - packet->l2 to the start of the Ethernet header.
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*
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* - packet->l3 to just past the Ethernet header, or just past the
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* vlan_header if one is present, to the first byte of the payload of the
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* Ethernet frame.
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*
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* - packet->l4 to just past the IPv4 header, if one is present and has a
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* correct length, and otherwise NULL.
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*
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* - packet->l7 to just past the TCP or UDP or ICMP header, if one is
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* present and has a correct length, and otherwise NULL.
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*/
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int
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flow_extract(struct ofpbuf *packet, ovs_be64 tun_id, uint16_t in_port,
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struct flow *flow)
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{
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struct ofpbuf b = *packet;
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struct eth_header *eth;
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int retval = 0;
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COVERAGE_INC(flow_extract);
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memset(flow, 0, sizeof *flow);
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flow->tun_id = tun_id;
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flow->in_port = in_port;
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packet->l2 = b.data;
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packet->l3 = NULL;
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packet->l4 = NULL;
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packet->l7 = NULL;
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if (b.size < sizeof *eth) {
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return 0;
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}
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/* Link layer. */
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eth = b.data;
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memcpy(flow->dl_src, eth->eth_src, ETH_ADDR_LEN);
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memcpy(flow->dl_dst, eth->eth_dst, ETH_ADDR_LEN);
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/* dl_type, vlan_tci. */
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ofpbuf_pull(&b, ETH_ADDR_LEN * 2);
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if (eth->eth_type == htons(ETH_TYPE_VLAN)) {
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parse_vlan(&b, flow);
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}
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flow->dl_type = parse_ethertype(&b);
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/* Network layer. */
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packet->l3 = b.data;
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if (flow->dl_type == htons(ETH_TYPE_IP)) {
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const struct ip_header *nh = pull_ip(&b);
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if (nh) {
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flow->nw_src = get_unaligned_be32(&nh->ip_src);
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flow->nw_dst = get_unaligned_be32(&nh->ip_dst);
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flow->nw_tos = nh->ip_tos & IP_DSCP_MASK;
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flow->nw_proto = nh->ip_proto;
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packet->l4 = b.data;
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if (!IP_IS_FRAGMENT(nh->ip_frag_off)) {
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if (flow->nw_proto == IP_TYPE_TCP) {
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const struct tcp_header *tcp = pull_tcp(&b);
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if (tcp) {
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flow->tp_src = tcp->tcp_src;
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flow->tp_dst = tcp->tcp_dst;
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packet->l7 = b.data;
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}
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} else if (flow->nw_proto == IP_TYPE_UDP) {
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const struct udp_header *udp = pull_udp(&b);
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if (udp) {
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flow->tp_src = udp->udp_src;
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flow->tp_dst = udp->udp_dst;
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packet->l7 = b.data;
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}
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} else if (flow->nw_proto == IP_TYPE_ICMP) {
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const struct icmp_header *icmp = pull_icmp(&b);
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if (icmp) {
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flow->icmp_type = htons(icmp->icmp_type);
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flow->icmp_code = htons(icmp->icmp_code);
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packet->l7 = b.data;
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}
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}
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} else {
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retval = 1;
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}
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}
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} else if (flow->dl_type == htons(ETH_TYPE_ARP)) {
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const struct arp_eth_header *arp = pull_arp(&b);
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if (arp && arp->ar_hrd == htons(1)
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&& arp->ar_pro == htons(ETH_TYPE_IP)
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&& arp->ar_hln == ETH_ADDR_LEN
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&& arp->ar_pln == 4) {
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/* We only match on the lower 8 bits of the opcode. */
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if (ntohs(arp->ar_op) <= 0xff) {
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flow->nw_proto = ntohs(arp->ar_op);
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}
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if ((flow->nw_proto == ARP_OP_REQUEST)
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|| (flow->nw_proto == ARP_OP_REPLY)) {
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flow->nw_src = arp->ar_spa;
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flow->nw_dst = arp->ar_tpa;
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}
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}
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}
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return retval;
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}
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/* Extracts the flow stats for a packet. The 'flow' and 'packet'
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* arguments must have been initialized through a call to flow_extract().
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*/
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void
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flow_extract_stats(const struct flow *flow, struct ofpbuf *packet,
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struct dpif_flow_stats *stats)
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{
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memset(stats, 0, sizeof(*stats));
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if ((flow->dl_type == htons(ETH_TYPE_IP)) && packet->l4) {
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if ((flow->nw_proto == IP_TYPE_TCP) && packet->l7) {
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struct tcp_header *tcp = packet->l4;
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stats->tcp_flags = TCP_FLAGS(tcp->tcp_ctl);
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}
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}
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stats->n_bytes = packet->size;
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stats->n_packets = 1;
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}
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char *
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flow_to_string(const struct flow *flow)
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{
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struct ds ds = DS_EMPTY_INITIALIZER;
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flow_format(&ds, flow);
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return ds_cstr(&ds);
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}
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void
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flow_format(struct ds *ds, const struct flow *flow)
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{
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ds_put_format(ds, "tunnel%#"PRIx64":in_port%04"PRIx16":tci(",
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flow->tun_id, flow->in_port);
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if (flow->vlan_tci) {
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ds_put_format(ds, "vlan%"PRIu16",pcp%d",
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vlan_tci_to_vid(flow->vlan_tci),
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vlan_tci_to_pcp(flow->vlan_tci));
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} else {
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ds_put_char(ds, '0');
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}
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ds_put_format(ds, ") mac"ETH_ADDR_FMT"->"ETH_ADDR_FMT
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" type%04"PRIx16
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" proto%"PRIu8
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" tos%"PRIu8
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" ip"IP_FMT"->"IP_FMT
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" port%"PRIu16"->%"PRIu16,
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ETH_ADDR_ARGS(flow->dl_src),
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ETH_ADDR_ARGS(flow->dl_dst),
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ntohs(flow->dl_type),
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flow->nw_proto,
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flow->nw_tos,
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IP_ARGS(&flow->nw_src),
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IP_ARGS(&flow->nw_dst),
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ntohs(flow->tp_src),
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ntohs(flow->tp_dst));
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}
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void
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flow_print(FILE *stream, const struct flow *flow)
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{
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char *s = flow_to_string(flow);
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fputs(s, stream);
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free(s);
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}
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/* flow_wildcards functions. */
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/* Initializes 'wc' as a set of wildcards that matches every packet. */
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void
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flow_wildcards_init_catchall(struct flow_wildcards *wc)
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{
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wc->wildcards = FWW_ALL;
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wc->tun_id_mask = htonll(0);
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wc->nw_src_mask = htonl(0);
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wc->nw_dst_mask = htonl(0);
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memset(wc->reg_masks, 0, sizeof wc->reg_masks);
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wc->vlan_tci_mask = htons(0);
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wc->zero = 0;
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}
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/* Initializes 'wc' as an exact-match set of wildcards; that is, 'wc' does not
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* wildcard any bits or fields. */
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void
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flow_wildcards_init_exact(struct flow_wildcards *wc)
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{
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wc->wildcards = 0;
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wc->tun_id_mask = htonll(UINT64_MAX);
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wc->nw_src_mask = htonl(UINT32_MAX);
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wc->nw_dst_mask = htonl(UINT32_MAX);
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memset(wc->reg_masks, 0xff, sizeof wc->reg_masks);
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wc->vlan_tci_mask = htons(UINT16_MAX);
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wc->zero = 0;
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}
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/* Returns true if 'wc' is exact-match, false if 'wc' wildcards any bits or
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* fields. */
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bool
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flow_wildcards_is_exact(const struct flow_wildcards *wc)
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{
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int i;
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if (wc->wildcards
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|| wc->tun_id_mask != htonll(UINT64_MAX)
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|| wc->nw_src_mask != htonl(UINT32_MAX)
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|| wc->nw_dst_mask != htonl(UINT32_MAX)
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|| wc->vlan_tci_mask != htons(UINT16_MAX)) {
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return false;
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}
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for (i = 0; i < FLOW_N_REGS; i++) {
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if (wc->reg_masks[i] != htonl(UINT32_MAX)) {
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return false;
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}
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}
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return true;
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}
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/* Initializes 'dst' as the combination of wildcards in 'src1' and 'src2'.
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* That is, a bit or a field is wildcarded in 'dst' if it is wildcarded in
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* 'src1' or 'src2' or both. */
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void
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flow_wildcards_combine(struct flow_wildcards *dst,
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const struct flow_wildcards *src1,
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const struct flow_wildcards *src2)
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{
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int i;
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dst->wildcards = src1->wildcards | src2->wildcards;
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dst->tun_id_mask = src1->tun_id_mask & src2->tun_id_mask;
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dst->nw_src_mask = src1->nw_src_mask & src2->nw_src_mask;
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dst->nw_dst_mask = src1->nw_dst_mask & src2->nw_dst_mask;
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for (i = 0; i < FLOW_N_REGS; i++) {
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dst->reg_masks[i] = src1->reg_masks[i] & src2->reg_masks[i];
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}
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dst->vlan_tci_mask = src1->vlan_tci_mask & src2->vlan_tci_mask;
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}
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/* Returns a hash of the wildcards in 'wc'. */
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uint32_t
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flow_wildcards_hash(const struct flow_wildcards *wc)
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{
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/* If you change struct flow_wildcards and thereby trigger this
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* assertion, please check that the new struct flow_wildcards has no holes
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* in it before you update the assertion. */
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BUILD_ASSERT_DECL(sizeof *wc == 24 + FLOW_N_REGS * 4);
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return hash_bytes(wc, sizeof *wc, 0);
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}
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/* Returns true if 'a' and 'b' represent the same wildcards, false if they are
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* different. */
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bool
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flow_wildcards_equal(const struct flow_wildcards *a,
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const struct flow_wildcards *b)
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{
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int i;
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if (a->wildcards != b->wildcards
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|| a->tun_id_mask != b->tun_id_mask
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|| a->nw_src_mask != b->nw_src_mask
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|| a->nw_dst_mask != b->nw_dst_mask
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|| a->vlan_tci_mask != b->vlan_tci_mask) {
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return false;
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}
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for (i = 0; i < FLOW_N_REGS; i++) {
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if (a->reg_masks[i] != b->reg_masks[i]) {
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return false;
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}
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}
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return true;
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}
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/* Returns true if at least one bit or field is wildcarded in 'a' but not in
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* 'b', false otherwise. */
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bool
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flow_wildcards_has_extra(const struct flow_wildcards *a,
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const struct flow_wildcards *b)
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{
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int i;
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for (i = 0; i < FLOW_N_REGS; i++) {
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if ((a->reg_masks[i] & b->reg_masks[i]) != b->reg_masks[i]) {
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return true;
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}
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}
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return (a->wildcards & ~b->wildcards
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|| (a->tun_id_mask & b->tun_id_mask) != b->tun_id_mask
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|| (a->nw_src_mask & b->nw_src_mask) != b->nw_src_mask
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|| (a->nw_dst_mask & b->nw_dst_mask) != b->nw_dst_mask
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|| (a->vlan_tci_mask & b->vlan_tci_mask) != b->vlan_tci_mask);
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}
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static bool
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set_nw_mask(ovs_be32 *maskp, ovs_be32 mask)
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{
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if (ip_is_cidr(mask)) {
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*maskp = mask;
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return true;
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} else {
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return false;
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}
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}
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/* Sets the IP (or ARP) source wildcard mask to CIDR 'mask' (consisting of N
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* high-order 1-bit and 32-N low-order 0-bits). Returns true if successful,
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* false if 'mask' is not a CIDR mask. */
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bool
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flow_wildcards_set_nw_src_mask(struct flow_wildcards *wc, ovs_be32 mask)
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{
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return set_nw_mask(&wc->nw_src_mask, mask);
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}
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/* Sets the IP (or ARP) destination wildcard mask to CIDR 'mask' (consisting of
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* N high-order 1-bit and 32-N low-order 0-bits). Returns true if successful,
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* false if 'mask' is not a CIDR mask. */
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bool
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flow_wildcards_set_nw_dst_mask(struct flow_wildcards *wc, ovs_be32 mask)
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{
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return set_nw_mask(&wc->nw_dst_mask, mask);
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}
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/* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'.
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* (A 0-bit indicates a wildcard bit.) */
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void
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flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask)
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{
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wc->reg_masks[idx] = mask;
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}
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