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flow.c
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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include <sys/types.h>
#include "flow.h"
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "byte-order.h"
#include "coverage.h"
#include "csum.h"
#include "dynamic-string.h"
#include "hash.h"
#include "jhash.h"
#include "match.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
#include "packets.h"
#include "odp-util.h"
#include "random.h"
#include "unaligned.h"
COVERAGE_DEFINE(flow_extract);
COVERAGE_DEFINE(miniflow_malloc);
/* U32 indices for segmented flow classification. */
const uint8_t flow_segment_u32s[4] = {
FLOW_SEGMENT_1_ENDS_AT / 4,
FLOW_SEGMENT_2_ENDS_AT / 4,
FLOW_SEGMENT_3_ENDS_AT / 4,
FLOW_U32S
};
/* miniflow_extract() assumes the following to be true to optimize the
* extraction process. */
BUILD_ASSERT_DECL(offsetof(struct flow, dl_type) + 2
== offsetof(struct flow, vlan_tci) &&
offsetof(struct flow, dl_type) / 4
== offsetof(struct flow, vlan_tci) / 4 );
BUILD_ASSERT_DECL(offsetof(struct flow, nw_frag) + 3
== offsetof(struct flow, nw_proto) &&
offsetof(struct flow, nw_tos) + 2
== offsetof(struct flow, nw_proto) &&
offsetof(struct flow, nw_ttl) + 1
== offsetof(struct flow, nw_proto) &&
offsetof(struct flow, nw_frag) / 4
== offsetof(struct flow, nw_tos) / 4 &&
offsetof(struct flow, nw_ttl) / 4
== offsetof(struct flow, nw_tos) / 4 &&
offsetof(struct flow, nw_proto) / 4
== offsetof(struct flow, nw_tos) / 4);
/* TCP flags in the first half of a BE32, zeroes in the other half. */
BUILD_ASSERT_DECL(offsetof(struct flow, tcp_flags) + 2
== offsetof(struct flow, pad) &&
offsetof(struct flow, tcp_flags) / 4
== offsetof(struct flow, pad) / 4);
#if WORDS_BIGENDIAN
#define TCP_FLAGS_BE32(tcp_ctl) ((OVS_FORCE ovs_be32)TCP_FLAGS_BE16(tcp_ctl) \
<< 16)
#else
#define TCP_FLAGS_BE32(tcp_ctl) ((OVS_FORCE ovs_be32)TCP_FLAGS_BE16(tcp_ctl))
#endif
BUILD_ASSERT_DECL(offsetof(struct flow, tp_src) + 2
== offsetof(struct flow, tp_dst) &&
offsetof(struct flow, tp_src) / 4
== offsetof(struct flow, tp_dst) / 4);
/* Removes 'size' bytes from the head end of '*datap', of size '*sizep', which
* must contain at least 'size' bytes of data. Returns the first byte of data
* removed. */
static inline const void *
data_pull(void **datap, size_t *sizep, size_t size)
{
char *data = (char *)*datap;
*datap = data + size;
*sizep -= size;
return data;
}
/* If '*datap' has at least 'size' bytes of data, removes that many bytes from
* the head end of '*datap' and returns the first byte removed. Otherwise,
* returns a null pointer without modifying '*datap'. */
static inline const void *
data_try_pull(void **datap, size_t *sizep, size_t size)
{
return OVS_LIKELY(*sizep >= size) ? data_pull(datap, sizep, size) : NULL;
}
/* Context for pushing data to a miniflow. */
struct mf_ctx {
uint64_t map;
uint32_t *data;
uint32_t * const end;
};
/* miniflow_push_* macros allow filling in a miniflow data values in order.
* Assertions are needed only when the layout of the struct flow is modified.
* 'ofs' is a compile-time constant, which allows most of the code be optimized
* away. Some GCC versions gave warnings on ALWAYS_INLINE, so these are
* defined as macros. */
#if (FLOW_WC_SEQ != 27)
#define MINIFLOW_ASSERT(X) ovs_assert(X)
BUILD_MESSAGE("FLOW_WC_SEQ changed: miniflow_extract() will have runtime "
"assertions enabled. Consider updating FLOW_WC_SEQ after "
"testing")
#else
#define MINIFLOW_ASSERT(X)
#endif
#define miniflow_push_uint32_(MF, OFS, VALUE) \
{ \
MINIFLOW_ASSERT(MF.data < MF.end && (OFS) % 4 == 0 \
&& !(MF.map & (UINT64_MAX << (OFS) / 4))); \
*MF.data++ = VALUE; \
MF.map |= UINT64_C(1) << (OFS) / 4; \
}
#define miniflow_push_be32_(MF, OFS, VALUE) \
miniflow_push_uint32_(MF, OFS, (OVS_FORCE uint32_t)(VALUE))
#define miniflow_push_uint16_(MF, OFS, VALUE) \
{ \
MINIFLOW_ASSERT(MF.data < MF.end && \
(((OFS) % 4 == 0 && !(MF.map & (UINT64_MAX << (OFS) / 4))) \
|| ((OFS) % 4 == 2 && MF.map & (UINT64_C(1) << (OFS) / 4) \
&& !(MF.map & (UINT64_MAX << ((OFS) / 4 + 1)))))); \
\
if ((OFS) % 4 == 0) { \
*(uint16_t *)MF.data = VALUE; \
MF.map |= UINT64_C(1) << (OFS) / 4; \
} else if ((OFS) % 4 == 2) { \
*((uint16_t *)MF.data + 1) = VALUE; \
MF.data++; \
} \
}
#define miniflow_push_be16_(MF, OFS, VALUE) \
miniflow_push_uint16_(MF, OFS, (OVS_FORCE uint16_t)VALUE);
/* Data at 'valuep' may be unaligned. */
#define miniflow_push_words_(MF, OFS, VALUEP, N_WORDS) \
{ \
int ofs32 = (OFS) / 4; \
\
MINIFLOW_ASSERT(MF.data + (N_WORDS) <= MF.end && (OFS) % 4 == 0 \
&& !(MF.map & (UINT64_MAX << ofs32))); \
\
memcpy(MF.data, (VALUEP), (N_WORDS) * sizeof *MF.data); \
MF.data += (N_WORDS); \
MF.map |= ((UINT64_MAX >> (64 - (N_WORDS))) << ofs32); \
}
#define miniflow_push_uint32(MF, FIELD, VALUE) \
miniflow_push_uint32_(MF, offsetof(struct flow, FIELD), VALUE)
#define miniflow_push_be32(MF, FIELD, VALUE) \
miniflow_push_be32_(MF, offsetof(struct flow, FIELD), VALUE)
#define miniflow_push_uint32_check(MF, FIELD, VALUE) \
{ if (OVS_LIKELY(VALUE)) { \
miniflow_push_uint32_(MF, offsetof(struct flow, FIELD), VALUE); \
} \
}
#define miniflow_push_be32_check(MF, FIELD, VALUE) \
{ if (OVS_LIKELY(VALUE)) { \
miniflow_push_be32_(MF, offsetof(struct flow, FIELD), VALUE); \
} \
}
#define miniflow_push_uint16(MF, FIELD, VALUE) \
miniflow_push_uint16_(MF, offsetof(struct flow, FIELD), VALUE)
#define miniflow_push_be16(MF, FIELD, VALUE) \
miniflow_push_be16_(MF, offsetof(struct flow, FIELD), VALUE)
#define miniflow_push_words(MF, FIELD, VALUEP, N_WORDS) \
miniflow_push_words_(MF, offsetof(struct flow, FIELD), VALUEP, N_WORDS)
/* Pulls the MPLS headers at '*datap' and returns the count of them. */
static inline int
parse_mpls(void **datap, size_t *sizep)
{
const struct mpls_hdr *mh;
int count = 0;
while ((mh = data_try_pull(datap, sizep, sizeof *mh))) {
count++;
if (mh->mpls_lse.lo & htons(1 << MPLS_BOS_SHIFT)) {
break;
}
}
return MIN(count, FLOW_MAX_MPLS_LABELS);
}
static inline ovs_be16
parse_vlan(void **datap, size_t *sizep)
{
const struct eth_header *eth = *datap;
struct qtag_prefix {
ovs_be16 eth_type; /* ETH_TYPE_VLAN */
ovs_be16 tci;
};
data_pull(datap, sizep, ETH_ADDR_LEN * 2);
if (eth->eth_type == htons(ETH_TYPE_VLAN)) {
if (OVS_LIKELY(*sizep
>= sizeof(struct qtag_prefix) + sizeof(ovs_be16))) {
const struct qtag_prefix *qp = data_pull(datap, sizep, sizeof *qp);
return qp->tci | htons(VLAN_CFI);
}
}
return 0;
}
static inline ovs_be16
parse_ethertype(void **datap, size_t *sizep)
{
const struct llc_snap_header *llc;
ovs_be16 proto;
proto = *(ovs_be16 *) data_pull(datap, sizep, sizeof proto);
if (OVS_LIKELY(ntohs(proto) >= ETH_TYPE_MIN)) {
return proto;
}
if (OVS_UNLIKELY(*sizep < sizeof *llc)) {
return htons(FLOW_DL_TYPE_NONE);
}
llc = *datap;
if (OVS_UNLIKELY(llc->llc.llc_dsap != LLC_DSAP_SNAP
|| llc->llc.llc_ssap != LLC_SSAP_SNAP
|| llc->llc.llc_cntl != LLC_CNTL_SNAP
|| memcmp(llc->snap.snap_org, SNAP_ORG_ETHERNET,
sizeof llc->snap.snap_org))) {
return htons(FLOW_DL_TYPE_NONE);
}
data_pull(datap, sizep, sizeof *llc);
if (OVS_LIKELY(ntohs(llc->snap.snap_type) >= ETH_TYPE_MIN)) {
return llc->snap.snap_type;
}
return htons(FLOW_DL_TYPE_NONE);
}
static inline bool
parse_icmpv6(void **datap, size_t *sizep, const struct icmp6_hdr *icmp,
const struct in6_addr **nd_target,
uint8_t arp_buf[2][ETH_ADDR_LEN])
{
if (icmp->icmp6_code == 0 &&
(icmp->icmp6_type == ND_NEIGHBOR_SOLICIT ||
icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) {
*nd_target = data_try_pull(datap, sizep, sizeof **nd_target);
if (OVS_UNLIKELY(!*nd_target)) {
return false;
}
while (*sizep >= 8) {
/* The minimum size of an option is 8 bytes, which also is
* the size of Ethernet link-layer options. */
const struct nd_opt_hdr *nd_opt = *datap;
int opt_len = nd_opt->nd_opt_len * 8;
if (!opt_len || opt_len > *sizep) {
goto invalid;
}
/* Store the link layer address if the appropriate option is
* provided. It is considered an error if the same link
* layer option is specified twice. */
if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
&& opt_len == 8) {
if (OVS_LIKELY(eth_addr_is_zero(arp_buf[0]))) {
memcpy(arp_buf[0], nd_opt + 1, ETH_ADDR_LEN);
} else {
goto invalid;
}
} else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR
&& opt_len == 8) {
if (OVS_LIKELY(eth_addr_is_zero(arp_buf[1]))) {
memcpy(arp_buf[1], nd_opt + 1, ETH_ADDR_LEN);
} else {
goto invalid;
}
}
if (OVS_UNLIKELY(!data_try_pull(datap, sizep, opt_len))) {
goto invalid;
}
}
}
return true;
invalid:
return false;
}
/* Initializes 'flow' members from 'packet' and 'md'
*
* Initializes 'packet' header l2 pointer to the start of the Ethernet
* header, and the layer offsets as follows:
*
* - packet->l2_5_ofs to the start of the MPLS shim header, or UINT16_MAX
* when there is no MPLS shim header.
*
* - packet->l3_ofs to just past the Ethernet header, or just past the
* vlan_header if one is present, to the first byte of the payload of the
* Ethernet frame. UINT16_MAX if the frame is too short to contain an
* Ethernet header.
*
* - packet->l4_ofs to just past the IPv4 header, if one is present and
* has at least the content used for the fields of interest for the flow,
* otherwise UINT16_MAX.
*/
void
flow_extract(struct ofpbuf *packet, const struct pkt_metadata *md,
struct flow *flow)
{
struct {
struct miniflow mf;
uint32_t buf[FLOW_U32S];
} m;
COVERAGE_INC(flow_extract);
miniflow_initialize(&m.mf, m.buf);
miniflow_extract(packet, md, &m.mf);
miniflow_expand(&m.mf, flow);
}
/* Caller is responsible for initializing 'dst' with enough storage for
* FLOW_U32S * 4 bytes. */
void
miniflow_extract(struct ofpbuf *packet, const struct pkt_metadata *md,
struct miniflow *dst)
{
void *data = ofpbuf_data(packet);
size_t size = ofpbuf_size(packet);
uint32_t *values = miniflow_values(dst);
struct mf_ctx mf = { 0, values, values + FLOW_U32S };
char *l2;
ovs_be16 dl_type;
uint8_t nw_frag, nw_tos, nw_ttl, nw_proto;
/* Metadata. */
if (md) {
if (md->tunnel.ip_dst) {
miniflow_push_words(mf, tunnel, &md->tunnel,
sizeof md->tunnel / 4);
}
miniflow_push_uint32_check(mf, skb_priority, md->skb_priority);
miniflow_push_uint32_check(mf, pkt_mark, md->pkt_mark);
miniflow_push_uint32_check(mf, recirc_id, md->recirc_id);
miniflow_push_uint32(mf, in_port, odp_to_u32(md->in_port.odp_port));
}
/* Initialize packet's layer pointer and offsets. */
l2 = data;
ofpbuf_set_frame(packet, data);
/* Must have full Ethernet header to proceed. */
if (OVS_UNLIKELY(size < sizeof(struct eth_header))) {
goto out;
} else {
ovs_be16 vlan_tci;
/* Link layer. */
BUILD_ASSERT(offsetof(struct flow, dl_dst) + 6
== offsetof(struct flow, dl_src));
miniflow_push_words(mf, dl_dst, data, ETH_ADDR_LEN * 2 / 4);
/* dl_type, vlan_tci. */
vlan_tci = parse_vlan(&data, &size);
dl_type = parse_ethertype(&data, &size);
miniflow_push_be16(mf, dl_type, dl_type);
miniflow_push_be16(mf, vlan_tci, vlan_tci);
}
/* Parse mpls. */
if (OVS_UNLIKELY(eth_type_mpls(dl_type))) {
int count;
const void *mpls = data;
packet->l2_5_ofs = (char *)data - l2;
count = parse_mpls(&data, &size);
miniflow_push_words(mf, mpls_lse, mpls, count);
}
/* Network layer. */
packet->l3_ofs = (char *)data - l2;
nw_frag = 0;
if (OVS_LIKELY(dl_type == htons(ETH_TYPE_IP))) {
const struct ip_header *nh = data;
int ip_len;
if (OVS_UNLIKELY(size < IP_HEADER_LEN)) {
goto out;
}
ip_len = IP_IHL(nh->ip_ihl_ver) * 4;
if (OVS_UNLIKELY(ip_len < IP_HEADER_LEN)) {
goto out;
}
/* Push both source and destination address at once. */
miniflow_push_words(mf, nw_src, &nh->ip_src, 2);
nw_tos = nh->ip_tos;
nw_ttl = nh->ip_ttl;
nw_proto = nh->ip_proto;
if (OVS_UNLIKELY(IP_IS_FRAGMENT(nh->ip_frag_off))) {
nw_frag = FLOW_NW_FRAG_ANY;
if (nh->ip_frag_off & htons(IP_FRAG_OFF_MASK)) {
nw_frag |= FLOW_NW_FRAG_LATER;
}
}
if (OVS_UNLIKELY(size < ip_len)) {
goto out;
}
data_pull(&data, &size, ip_len);
} else if (dl_type == htons(ETH_TYPE_IPV6)) {
const struct ovs_16aligned_ip6_hdr *nh;
ovs_be32 tc_flow;
if (OVS_UNLIKELY(size < sizeof *nh)) {
goto out;
}
nh = data_pull(&data, &size, sizeof *nh);
miniflow_push_words(mf, ipv6_src, &nh->ip6_src,
sizeof nh->ip6_src / 4);
miniflow_push_words(mf, ipv6_dst, &nh->ip6_dst,
sizeof nh->ip6_dst / 4);
tc_flow = get_16aligned_be32(&nh->ip6_flow);
{
ovs_be32 label = tc_flow & htonl(IPV6_LABEL_MASK);
miniflow_push_be32_check(mf, ipv6_label, label);
}
nw_tos = ntohl(tc_flow) >> 20;
nw_ttl = nh->ip6_hlim;
nw_proto = nh->ip6_nxt;
while (1) {
if (OVS_LIKELY((nw_proto != IPPROTO_HOPOPTS)
&& (nw_proto != IPPROTO_ROUTING)
&& (nw_proto != IPPROTO_DSTOPTS)
&& (nw_proto != IPPROTO_AH)
&& (nw_proto != IPPROTO_FRAGMENT))) {
/* It's either a terminal header (e.g., TCP, UDP) or one we
* don't understand. In either case, we're done with the
* packet, so use it to fill in 'nw_proto'. */
break;
}
/* We only verify that at least 8 bytes of the next header are
* available, but many of these headers are longer. Ensure that
* accesses within the extension header are within those first 8
* bytes. All extension headers are required to be at least 8
* bytes. */
if (OVS_UNLIKELY(size < 8)) {
goto out;
}
if ((nw_proto == IPPROTO_HOPOPTS)
|| (nw_proto == IPPROTO_ROUTING)
|| (nw_proto == IPPROTO_DSTOPTS)) {
/* These headers, while different, have the fields we care
* about in the same location and with the same
* interpretation. */
const struct ip6_ext *ext_hdr = data;
nw_proto = ext_hdr->ip6e_nxt;
if (OVS_UNLIKELY(!data_try_pull(&data, &size,
(ext_hdr->ip6e_len + 1) * 8))) {
goto out;
}
} else if (nw_proto == IPPROTO_AH) {
/* A standard AH definition isn't available, but the fields
* we care about are in the same location as the generic
* option header--only the header length is calculated
* differently. */
const struct ip6_ext *ext_hdr = data;
nw_proto = ext_hdr->ip6e_nxt;
if (OVS_UNLIKELY(!data_try_pull(&data, &size,
(ext_hdr->ip6e_len + 2) * 4))) {
goto out;
}
} else if (nw_proto == IPPROTO_FRAGMENT) {
const struct ovs_16aligned_ip6_frag *frag_hdr = data;
nw_proto = frag_hdr->ip6f_nxt;
if (!data_try_pull(&data, &size, sizeof *frag_hdr)) {
goto out;
}
/* We only process the first fragment. */
if (frag_hdr->ip6f_offlg != htons(0)) {
nw_frag = FLOW_NW_FRAG_ANY;
if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) != htons(0)) {
nw_frag |= FLOW_NW_FRAG_LATER;
nw_proto = IPPROTO_FRAGMENT;
break;
}
}
}
}
} else {
if (dl_type == htons(ETH_TYPE_ARP) ||
dl_type == htons(ETH_TYPE_RARP)) {
uint8_t arp_buf[2][ETH_ADDR_LEN];
const struct arp_eth_header *arp = (const struct arp_eth_header *)
data_try_pull(&data, &size, ARP_ETH_HEADER_LEN);
if (OVS_LIKELY(arp) && OVS_LIKELY(arp->ar_hrd == htons(1))
&& OVS_LIKELY(arp->ar_pro == htons(ETH_TYPE_IP))
&& OVS_LIKELY(arp->ar_hln == ETH_ADDR_LEN)
&& OVS_LIKELY(arp->ar_pln == 4)) {
miniflow_push_words(mf, nw_src, &arp->ar_spa, 1);
miniflow_push_words(mf, nw_dst, &arp->ar_tpa, 1);
/* We only match on the lower 8 bits of the opcode. */
if (OVS_LIKELY(ntohs(arp->ar_op) <= 0xff)) {
miniflow_push_be32(mf, nw_frag, htonl(ntohs(arp->ar_op)));
}
/* Must be adjacent. */
BUILD_ASSERT(offsetof(struct flow, arp_sha) + 6
== offsetof(struct flow, arp_tha));
memcpy(arp_buf[0], arp->ar_sha, ETH_ADDR_LEN);
memcpy(arp_buf[1], arp->ar_tha, ETH_ADDR_LEN);
miniflow_push_words(mf, arp_sha, arp_buf,
ETH_ADDR_LEN * 2 / 4);
}
}
goto out;
}
packet->l4_ofs = (char *)data - l2;
miniflow_push_be32(mf, nw_frag,
BYTES_TO_BE32(nw_frag, nw_tos, nw_ttl, nw_proto));
if (OVS_LIKELY(!(nw_frag & FLOW_NW_FRAG_LATER))) {
if (OVS_LIKELY(nw_proto == IPPROTO_TCP)) {
if (OVS_LIKELY(size >= TCP_HEADER_LEN)) {
const struct tcp_header *tcp = data;
miniflow_push_be32(mf, tcp_flags,
TCP_FLAGS_BE32(tcp->tcp_ctl));
miniflow_push_words(mf, tp_src, &tcp->tcp_src, 1);
}
} else if (OVS_LIKELY(nw_proto == IPPROTO_UDP)) {
if (OVS_LIKELY(size >= UDP_HEADER_LEN)) {
const struct udp_header *udp = data;
miniflow_push_words(mf, tp_src, &udp->udp_src, 1);
}
} else if (OVS_LIKELY(nw_proto == IPPROTO_SCTP)) {
if (OVS_LIKELY(size >= SCTP_HEADER_LEN)) {
const struct sctp_header *sctp = data;
miniflow_push_words(mf, tp_src, &sctp->sctp_src, 1);
}
} else if (OVS_LIKELY(nw_proto == IPPROTO_ICMP)) {
if (OVS_LIKELY(size >= ICMP_HEADER_LEN)) {
const struct icmp_header *icmp = data;
miniflow_push_be16(mf, tp_src, htons(icmp->icmp_type));
miniflow_push_be16(mf, tp_dst, htons(icmp->icmp_code));
}
} else if (OVS_LIKELY(nw_proto == IPPROTO_IGMP)) {
if (OVS_LIKELY(size >= IGMP_HEADER_LEN)) {
const struct igmp_header *igmp = data;
miniflow_push_be16(mf, tp_src, htons(igmp->igmp_type));
miniflow_push_be16(mf, tp_dst, htons(igmp->igmp_code));
miniflow_push_be32(mf, igmp_group_ip4,
get_16aligned_be32(&igmp->group));
}
} else if (OVS_LIKELY(nw_proto == IPPROTO_ICMPV6)) {
if (OVS_LIKELY(size >= sizeof(struct icmp6_hdr))) {
const struct in6_addr *nd_target = NULL;
uint8_t arp_buf[2][ETH_ADDR_LEN];
const struct icmp6_hdr *icmp = data_pull(&data, &size,
sizeof *icmp);
memset(arp_buf, 0, sizeof arp_buf);
if (OVS_LIKELY(parse_icmpv6(&data, &size, icmp, &nd_target,
arp_buf))) {
miniflow_push_words(mf, arp_sha, arp_buf,
ETH_ADDR_LEN * 2 / 4);
if (nd_target) {
miniflow_push_words(mf, nd_target, nd_target,
sizeof *nd_target / 4);
}
miniflow_push_be16(mf, tp_src, htons(icmp->icmp6_type));
miniflow_push_be16(mf, tp_dst, htons(icmp->icmp6_code));
}
}
}
}
if (md) {
miniflow_push_uint32_check(mf, dp_hash, md->dp_hash);
}
out:
dst->map = mf.map;
}
/* For every bit of a field that is wildcarded in 'wildcards', sets the
* corresponding bit in 'flow' to zero. */
void
flow_zero_wildcards(struct flow *flow, const struct flow_wildcards *wildcards)
{
uint32_t *flow_u32 = (uint32_t *) flow;
const uint32_t *wc_u32 = (const uint32_t *) &wildcards->masks;
size_t i;
for (i = 0; i < FLOW_U32S; i++) {
flow_u32[i] &= wc_u32[i];
}
}
void
flow_unwildcard_tp_ports(const struct flow *flow, struct flow_wildcards *wc)
{
if (flow->nw_proto != IPPROTO_ICMP) {
memset(&wc->masks.tp_src, 0xff, sizeof wc->masks.tp_src);
memset(&wc->masks.tp_dst, 0xff, sizeof wc->masks.tp_dst);
} else {
wc->masks.tp_src = htons(0xff);
wc->masks.tp_dst = htons(0xff);
}
}
/* Initializes 'fmd' with the metadata found in 'flow'. */
void
flow_get_metadata(const struct flow *flow, struct flow_metadata *fmd)
{
BUILD_ASSERT_DECL(FLOW_WC_SEQ == 27);
fmd->dp_hash = flow->dp_hash;
fmd->recirc_id = flow->recirc_id;
fmd->tun_id = flow->tunnel.tun_id;
fmd->tun_src = flow->tunnel.ip_src;
fmd->tun_dst = flow->tunnel.ip_dst;
fmd->metadata = flow->metadata;
memcpy(fmd->regs, flow->regs, sizeof fmd->regs);
fmd->pkt_mark = flow->pkt_mark;
fmd->in_port = flow->in_port.ofp_port;
}
char *
flow_to_string(const struct flow *flow)
{
struct ds ds = DS_EMPTY_INITIALIZER;
flow_format(&ds, flow);
return ds_cstr(&ds);
}
const char *
flow_tun_flag_to_string(uint32_t flags)
{
switch (flags) {
case FLOW_TNL_F_DONT_FRAGMENT:
return "df";
case FLOW_TNL_F_CSUM:
return "csum";
case FLOW_TNL_F_KEY:
return "key";
case FLOW_TNL_F_OAM:
return "oam";
default:
return NULL;
}
}
void
format_flags(struct ds *ds, const char *(*bit_to_string)(uint32_t),
uint32_t flags, char del)
{
uint32_t bad = 0;
if (!flags) {
return;
}
while (flags) {
uint32_t bit = rightmost_1bit(flags);
const char *s;
s = bit_to_string(bit);
if (s) {
ds_put_format(ds, "%s%c", s, del);
} else {
bad |= bit;
}
flags &= ~bit;
}
if (bad) {
ds_put_format(ds, "0x%"PRIx32"%c", bad, del);
}
ds_chomp(ds, del);
}
void
format_flags_masked(struct ds *ds, const char *name,
const char *(*bit_to_string)(uint32_t), uint32_t flags,
uint32_t mask)
{
if (name) {
ds_put_format(ds, "%s=", name);
}
while (mask) {
uint32_t bit = rightmost_1bit(mask);
const char *s = bit_to_string(bit);
ds_put_format(ds, "%s%s", (flags & bit) ? "+" : "-",
s ? s : "[Unknown]");
mask &= ~bit;
}
}
void
flow_format(struct ds *ds, const struct flow *flow)
{
struct match match;
struct flow_wildcards *wc = &match.wc;
match_wc_init(&match, flow);
/* As this function is most often used for formatting a packet in a
* packet-in message, skip formatting the packet context fields that are
* all-zeroes (Openflow spec encourages leaving out all-zeroes context
* fields from the packet-in messages). We make an exception with the
* 'in_port' field, which we always format, as packets usually have an
* in_port, and 0 is a port just like any other port. */
if (!flow->skb_priority) {
WC_UNMASK_FIELD(wc, skb_priority);
}
if (!flow->pkt_mark) {
WC_UNMASK_FIELD(wc, pkt_mark);
}
if (!flow->recirc_id) {
WC_UNMASK_FIELD(wc, recirc_id);
}
for (int i = 0; i < FLOW_N_REGS; i++) {
if (!flow->regs[i]) {
WC_UNMASK_FIELD(wc, regs[i]);
}
}
if (!flow->metadata) {
WC_UNMASK_FIELD(wc, metadata);
}
match_format(&match, ds, OFP_DEFAULT_PRIORITY);
}
void
flow_print(FILE *stream, const struct flow *flow)
{
char *s = flow_to_string(flow);
fputs(s, stream);
free(s);
}
/* flow_wildcards functions. */
/* Initializes 'wc' as a set of wildcards that matches every packet. */
void
flow_wildcards_init_catchall(struct flow_wildcards *wc)
{
memset(&wc->masks, 0, sizeof wc->masks);
}
/* Converts a flow into flow wildcards. It sets the wildcard masks based on
* the packet headers extracted to 'flow'. It will not set the mask for fields
* that do not make sense for the packet type. OpenFlow-only metadata is
* wildcarded, but other metadata is unconditionally exact-matched. */
void flow_wildcards_init_for_packet(struct flow_wildcards *wc,
const struct flow *flow)
{
memset(&wc->masks, 0x0, sizeof wc->masks);
/* Update this function whenever struct flow changes. */
BUILD_ASSERT_DECL(FLOW_WC_SEQ == 27);
if (flow->tunnel.ip_dst) {
if (flow->tunnel.flags & FLOW_TNL_F_KEY) {
WC_MASK_FIELD(wc, tunnel.tun_id);
}
WC_MASK_FIELD(wc, tunnel.ip_src);
WC_MASK_FIELD(wc, tunnel.ip_dst);
WC_MASK_FIELD(wc, tunnel.flags);
WC_MASK_FIELD(wc, tunnel.ip_tos);
WC_MASK_FIELD(wc, tunnel.ip_ttl);
WC_MASK_FIELD(wc, tunnel.tp_src);
WC_MASK_FIELD(wc, tunnel.tp_dst);
} else if (flow->tunnel.tun_id) {
WC_MASK_FIELD(wc, tunnel.tun_id);
}
/* metadata and regs wildcarded. */
WC_MASK_FIELD(wc, skb_priority);
WC_MASK_FIELD(wc, pkt_mark);
WC_MASK_FIELD(wc, recirc_id);
WC_MASK_FIELD(wc, dp_hash);
WC_MASK_FIELD(wc, in_port);
WC_MASK_FIELD(wc, dl_dst);
WC_MASK_FIELD(wc, dl_src);
WC_MASK_FIELD(wc, dl_type);
WC_MASK_FIELD(wc, vlan_tci);
if (flow->dl_type == htons(ETH_TYPE_IP)) {
WC_MASK_FIELD(wc, nw_src);
WC_MASK_FIELD(wc, nw_dst);
} else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
WC_MASK_FIELD(wc, ipv6_src);
WC_MASK_FIELD(wc, ipv6_dst);
WC_MASK_FIELD(wc, ipv6_label);
} else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
flow->dl_type == htons(ETH_TYPE_RARP)) {
WC_MASK_FIELD(wc, nw_src);
WC_MASK_FIELD(wc, nw_dst);
WC_MASK_FIELD(wc, nw_proto);
WC_MASK_FIELD(wc, arp_sha);
WC_MASK_FIELD(wc, arp_tha);
return;
} else if (eth_type_mpls(flow->dl_type)) {
for (int i = 0; i < FLOW_MAX_MPLS_LABELS; i++) {
WC_MASK_FIELD(wc, mpls_lse[i]);
if (flow->mpls_lse[i] & htonl(MPLS_BOS_MASK)) {
break;
}
}
return;
} else {
return; /* Unknown ethertype. */
}
/* IPv4 or IPv6. */
WC_MASK_FIELD(wc, nw_frag);
WC_MASK_FIELD(wc, nw_tos);
WC_MASK_FIELD(wc, nw_ttl);
WC_MASK_FIELD(wc, nw_proto);
/* No transport layer header in later fragments. */
if (!(flow->nw_frag & FLOW_NW_FRAG_LATER) &&
(flow->nw_proto == IPPROTO_ICMP ||
flow->nw_proto == IPPROTO_ICMPV6 ||
flow->nw_proto == IPPROTO_TCP ||
flow->nw_proto == IPPROTO_UDP ||
flow->nw_proto == IPPROTO_SCTP ||
flow->nw_proto == IPPROTO_IGMP)) {
WC_MASK_FIELD(wc, tp_src);
WC_MASK_FIELD(wc, tp_dst);
if (flow->nw_proto == IPPROTO_TCP) {
WC_MASK_FIELD(wc, tcp_flags);
} else if (flow->nw_proto == IPPROTO_ICMPV6) {
WC_MASK_FIELD(wc, arp_sha);
WC_MASK_FIELD(wc, arp_tha);
WC_MASK_FIELD(wc, nd_target);
} else if (flow->nw_proto == IPPROTO_IGMP) {
WC_MASK_FIELD(wc, igmp_group_ip4);
}
}
}
/* Return a map of possible fields for a packet of the same type as 'flow'.
* Including extra bits in the returned mask is not wrong, it is just less
* optimal.
*
* This is a less precise version of flow_wildcards_init_for_packet() above. */
uint64_t
flow_wc_map(const struct flow *flow)
{
/* Update this function whenever struct flow changes. */
BUILD_ASSERT_DECL(FLOW_WC_SEQ == 27);
uint64_t map = (flow->tunnel.ip_dst) ? MINIFLOW_MAP(tunnel) : 0;
/* Metadata fields that can appear on packet input. */
map |= MINIFLOW_MAP(skb_priority) | MINIFLOW_MAP(pkt_mark)
| MINIFLOW_MAP(recirc_id) | MINIFLOW_MAP(dp_hash)
| MINIFLOW_MAP(in_port)
| MINIFLOW_MAP(dl_dst) | MINIFLOW_MAP(dl_src)
| MINIFLOW_MAP(dl_type) | MINIFLOW_MAP(vlan_tci);
/* Ethertype-dependent fields. */
if (OVS_LIKELY(flow->dl_type == htons(ETH_TYPE_IP))) {
map |= MINIFLOW_MAP(nw_src) | MINIFLOW_MAP(nw_dst)
| MINIFLOW_MAP(nw_proto) | MINIFLOW_MAP(nw_frag)
| MINIFLOW_MAP(nw_tos) | MINIFLOW_MAP(nw_ttl);
if (OVS_UNLIKELY(flow->nw_proto == IPPROTO_IGMP)) {
map |= MINIFLOW_MAP(igmp_group_ip4);
} else {
map |= MINIFLOW_MAP(tcp_flags)
| MINIFLOW_MAP(tp_src) | MINIFLOW_MAP(tp_dst);
}
} else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
map |= MINIFLOW_MAP(ipv6_src) | MINIFLOW_MAP(ipv6_dst)
| MINIFLOW_MAP(ipv6_label)
| MINIFLOW_MAP(nw_proto) | MINIFLOW_MAP(nw_frag)
| MINIFLOW_MAP(nw_tos) | MINIFLOW_MAP(nw_ttl);
if (OVS_UNLIKELY(flow->nw_proto == IPPROTO_ICMPV6)) {
map |= MINIFLOW_MAP(nd_target)
| MINIFLOW_MAP(arp_sha) | MINIFLOW_MAP(arp_tha);
} else {
map |= MINIFLOW_MAP(tcp_flags)
| MINIFLOW_MAP(tp_src) | MINIFLOW_MAP(tp_dst);
}
} else if (eth_type_mpls(flow->dl_type)) {
map |= MINIFLOW_MAP(mpls_lse);
} else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
flow->dl_type == htons(ETH_TYPE_RARP)) {
map |= MINIFLOW_MAP(nw_src) | MINIFLOW_MAP(nw_dst)
| MINIFLOW_MAP(nw_proto)
| MINIFLOW_MAP(arp_sha) | MINIFLOW_MAP(arp_tha);
}
return map;
}
/* Clear the metadata and register wildcard masks. They are not packet
* header fields. */
void
flow_wildcards_clear_non_packet_fields(struct flow_wildcards *wc)
{
/* Update this function whenever struct flow changes. */
BUILD_ASSERT_DECL(FLOW_WC_SEQ == 27);
memset(&wc->masks.metadata, 0, sizeof wc->masks.metadata);
memset(&wc->masks.regs, 0, sizeof wc->masks.regs);
}
/* Returns true if 'wc' matches every packet, false if 'wc' fixes any bits or
* fields. */
bool
flow_wildcards_is_catchall(const struct flow_wildcards *wc)
{
const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
size_t i;
for (i = 0; i < FLOW_U32S; i++) {
if (wc_u32[i]) {
return false;
}
}
return true;
}
/* Sets 'dst' as the bitwise AND of wildcards in 'src1' and 'src2'.
* That is, a bit or a field is wildcarded in 'dst' if it is wildcarded
* in 'src1' or 'src2' or both. */
void
flow_wildcards_and(struct flow_wildcards *dst,
const struct flow_wildcards *src1,
const struct flow_wildcards *src2)
{
uint32_t *dst_u32 = (uint32_t *) &dst->masks;
const uint32_t *src1_u32 = (const uint32_t *) &src1->masks;
const uint32_t *src2_u32 = (const uint32_t *) &src2->masks;
size_t i;
for (i = 0; i < FLOW_U32S; i++) {