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ovs/lib/flow.c
Jarno Rajahalme 3c30d1118e lib/flow.h: Improve struct miniflow comment and definition. 
Miniflows can nowadays be dynamically allocated to different inline
sizes, as done by lib/classifier.c, but this had not been documented
at the struct miniflow definition.

Also, MINI_N_INLINE had a different value for 32-bit and 64-bit builds
due to a historical reason.  Now we use 8 for both.

Finally, use change the storage type of 'values_inline' to uint8_t, as
uint64_t looks kind of wide for a boolean, even though we intend the
bit be carved out from the uint64_t where 'map' resides.

Suggested-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
2014-08-26 15:51:29 -07:00

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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)
#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;
match_wc_init(&match, flow);
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);
}
/* Clear the metadata and register wildcard masks. They are not packet
* header fields. */
void
flow_wildcards_clear_non_packet_fields(struct flow_wildcards *wc)
{
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++) {
dst_u32[i] = src1_u32[i] & src2_u32[i];
}
}
/* Sets 'dst' as the bitwise OR of wildcards in 'src1' and 'src2'. That
* is, a bit or a field is wildcarded in 'dst' if it is neither
* wildcarded in 'src1' nor 'src2'. */
void
flow_wildcards_or(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++) {
dst_u32[i] = src1_u32[i] | src2_u32[i];
}
}
/* Returns a hash of the wildcards in 'wc'. */
uint32_t
flow_wildcards_hash(const struct flow_wildcards *wc, uint32_t basis)
{
return flow_hash(&wc->masks, basis);
}
/* Returns true if 'a' and 'b' represent the same wildcards, false if they are
* different. */
bool
flow_wildcards_equal(const struct flow_wildcards *a,
const struct flow_wildcards *b)
{
return flow_equal(&a->masks, &b->masks);
}
/* Returns true if at least one bit or field is wildcarded in 'a' but not in
* 'b', false otherwise. */
bool
flow_wildcards_has_extra(const struct flow_wildcards *a,
const struct flow_wildcards *b)
{
const uint32_t *a_u32 = (const uint32_t *) &a->masks;
const uint32_t *b_u32 = (const uint32_t *) &b->masks;
size_t i;
for (i = 0; i < FLOW_U32S; i++) {
if ((a_u32[i] & b_u32[i]) != b_u32[i]) {
return true;
}
}
return false;
}
/* Returns true if 'a' and 'b' are equal, except that 0-bits (wildcarded bits)
* in 'wc' do not need to be equal in 'a' and 'b'. */
bool
flow_equal_except(const struct flow *a, const struct flow *b,
const struct flow_wildcards *wc)
{
const uint32_t *a_u32 = (const uint32_t *) a;
const uint32_t *b_u32 = (const uint32_t *) b;
const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
size_t i;
for (i = 0; i < FLOW_U32S; i++) {
if ((a_u32[i] ^ b_u32[i]) & wc_u32[i]) {
return false;
}
}
return true;
}
/* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'.
* (A 0-bit indicates a wildcard bit.) */
void
flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask)
{
wc->masks.regs[idx] = mask;
}
/* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'.
* (A 0-bit indicates a wildcard bit.) */
void
flow_wildcards_set_xreg_mask(struct flow_wildcards *wc, int idx, uint64_t mask)
{
flow_set_xreg(&wc->masks, idx, mask);
}
/* Calculates the 5-tuple hash from the given miniflow.
* This returns the same value as flow_hash_5tuple for the corresponding
* flow. */
uint32_t
miniflow_hash_5tuple(const struct miniflow *flow, uint32_t basis)
{
uint32_t hash = basis;
if (flow) {
ovs_be16 dl_type = MINIFLOW_GET_BE16(flow, dl_type);
hash = hash_add(hash, MINIFLOW_GET_U8(flow, nw_proto));
/* Separate loops for better optimization. */
if (dl_type == htons(ETH_TYPE_IPV6)) {
uint64_t map = MINIFLOW_MAP(ipv6_src) | MINIFLOW_MAP(ipv6_dst)
| MINIFLOW_MAP(tp_src); /* Covers both ports */
uint32_t value;
MINIFLOW_FOR_EACH_IN_MAP(value, flow, map) {
hash = hash_add(hash, value);
}
} else {
uint64_t map = MINIFLOW_MAP(nw_src) | MINIFLOW_MAP(nw_dst)
| MINIFLOW_MAP(tp_src); /* Covers both ports */
uint32_t value;
MINIFLOW_FOR_EACH_IN_MAP(value, flow, map) {
hash = hash_add(hash, value);
}
}
hash = hash_finish(hash, 42); /* Arbitrary number. */
}
return hash;
}
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);
BUILD_ASSERT_DECL(offsetof(struct flow, ipv6_src) + 16
== offsetof(struct flow, ipv6_dst));
/* Calculates the 5-tuple hash from the given flow. */
uint32_t
flow_hash_5tuple(const struct flow *flow, uint32_t basis)
{
uint32_t hash = basis;
if (flow) {
const uint32_t *flow_u32 = (const uint32_t *)flow;
hash = hash_add(hash, flow->nw_proto);
if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
int ofs = offsetof(struct flow, ipv6_src) / 4;
int end = ofs + 2 * sizeof flow->ipv6_src / 4;
while (ofs < end) {
hash = hash_add(hash, flow_u32[ofs++]);
}
} else {
hash = hash_add(hash, (OVS_FORCE uint32_t) flow->nw_src);
hash = hash_add(hash, (OVS_FORCE uint32_t) flow->nw_dst);
}
hash = hash_add(hash, flow_u32[offsetof(struct flow, tp_src) / 4]);
hash = hash_finish(hash, 42); /* Arbitrary number. */
}
return hash;
}
/* Hashes 'flow' based on its L2 through L4 protocol information. */
uint32_t
flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis)
{
struct {
union {
ovs_be32 ipv4_addr;
struct in6_addr ipv6_addr;
};
ovs_be16 eth_type;
ovs_be16 vlan_tci;
ovs_be16 tp_port;
uint8_t eth_addr[ETH_ADDR_LEN];
uint8_t ip_proto;
} fields;
int i;
memset(&fields, 0, sizeof fields);
for (i = 0; i < ETH_ADDR_LEN; i++) {
fields.eth_addr[i] = flow->dl_src[i] ^ flow->dl_dst[i];
}
fields.vlan_tci = flow->vlan_tci & htons(VLAN_VID_MASK);
fields.eth_type = flow->dl_type;
/* UDP source and destination port are not taken into account because they
* will not necessarily be symmetric in a bidirectional flow. */
if (fields.eth_type == htons(ETH_TYPE_IP)) {
fields.ipv4_addr = flow->nw_src ^ flow->nw_dst;
fields.ip_proto = flow->nw_proto;
if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto == IPPROTO_SCTP) {
fields.tp_port = flow->tp_src ^ flow->tp_dst;
}
} else if (fields.eth_type == htons(ETH_TYPE_IPV6)) {
const uint8_t *a = &flow->ipv6_src.s6_addr[0];
const uint8_t *b = &flow->ipv6_dst.s6_addr[0];
uint8_t *ipv6_addr = &fields.ipv6_addr.s6_addr[0];
for (i=0; i<16; i++) {
ipv6_addr[i] = a[i] ^ b[i];
}
fields.ip_proto = flow->nw_proto;
if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto == IPPROTO_SCTP) {
fields.tp_port = flow->tp_src ^ flow->tp_dst;
}
}
return jhash_bytes(&fields, sizeof fields, basis);
}
/* Initialize a flow with random fields that matter for nx_hash_fields. */
void
flow_random_hash_fields(struct flow *flow)
{
uint16_t rnd = random_uint16();
/* Initialize to all zeros. */
memset(flow, 0, sizeof *flow);
eth_addr_random(flow->dl_src);
eth_addr_random(flow->dl_dst);
flow->vlan_tci = (OVS_FORCE ovs_be16) (random_uint16() & VLAN_VID_MASK);
/* Make most of the random flows IPv4, some IPv6, and rest random. */
flow->dl_type = rnd < 0x8000 ? htons(ETH_TYPE_IP) :
rnd < 0xc000 ? htons(ETH_TYPE_IPV6) : (OVS_FORCE ovs_be16)rnd;
if (dl_type_is_ip_any(flow->dl_type)) {
if (flow->dl_type == htons(ETH_TYPE_IP)) {
flow->nw_src = (OVS_FORCE ovs_be32)random_uint32();
flow->nw_dst = (OVS_FORCE ovs_be32)random_uint32();
} else {
random_bytes(&flow->ipv6_src, sizeof flow->ipv6_src);
random_bytes(&flow->ipv6_dst, sizeof flow->ipv6_dst);
}
/* Make most of IP flows TCP, some UDP or SCTP, and rest random. */
rnd = random_uint16();
flow->nw_proto = rnd < 0x8000 ? IPPROTO_TCP :
rnd < 0xc000 ? IPPROTO_UDP :
rnd < 0xd000 ? IPPROTO_SCTP : (uint8_t)rnd;
if (flow->nw_proto == IPPROTO_TCP ||
flow->nw_proto == IPPROTO_UDP ||
flow->nw_proto == IPPROTO_SCTP) {
flow->tp_src = (OVS_FORCE ovs_be16)random_uint16();
flow->tp_dst = (OVS_FORCE ovs_be16)random_uint16();
}
}
}
/* Masks the fields in 'wc' that are used by the flow hash 'fields'. */
void
flow_mask_hash_fields(const struct flow *flow, struct flow_wildcards *wc,
enum nx_hash_fields fields)
{
switch (fields) {
case NX_HASH_FIELDS_ETH_SRC:
memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
break;
case NX_HASH_FIELDS_SYMMETRIC_L4:
memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
if (flow->dl_type == htons(ETH_TYPE_IP)) {
memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst);
} else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
}
if (is_ip_any(flow)) {
memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
flow_unwildcard_tp_ports(flow, wc);
}
wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI);
break;
default:
OVS_NOT_REACHED();
}
}
/* Hashes the portions of 'flow' designated by 'fields'. */
uint32_t
flow_hash_fields(const struct flow *flow, enum nx_hash_fields fields,
uint16_t basis)
{
switch (fields) {
case NX_HASH_FIELDS_ETH_SRC:
return jhash_bytes(flow->dl_src, sizeof flow->dl_src, basis);
case NX_HASH_FIELDS_SYMMETRIC_L4:
return flow_hash_symmetric_l4(flow, basis);
}
OVS_NOT_REACHED();
}
/* Returns a string representation of 'fields'. */
const char *
flow_hash_fields_to_str(enum nx_hash_fields fields)
{
switch (fields) {
case NX_HASH_FIELDS_ETH_SRC: return "eth_src";
case NX_HASH_FIELDS_SYMMETRIC_L4: return "symmetric_l4";
default: return "<unknown>";
}
}
/* Returns true if the value of 'fields' is supported. Otherwise false. */
bool
flow_hash_fields_valid(enum nx_hash_fields fields)
{
return fields == NX_HASH_FIELDS_ETH_SRC
|| fields == NX_HASH_FIELDS_SYMMETRIC_L4;
}
/* Returns a hash value for the bits of 'flow' that are active based on
* 'wc', given 'basis'. */
uint32_t
flow_hash_in_wildcards(const struct flow *flow,
const struct flow_wildcards *wc, uint32_t basis)
{
const uint32_t *wc_u32 = (const uint32_t *) &wc->masks;
const uint32_t *flow_u32 = (const uint32_t *) flow;
uint32_t hash;
size_t i;
hash = basis;
for (i = 0; i < FLOW_U32S; i++) {
hash = hash_add(hash, flow_u32[i] & wc_u32[i]);
}
return hash_finish(hash, 4 * FLOW_U32S);
}
/* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
* OpenFlow 1.0 "dl_vlan" value:
*
* - If it is in the range 0...4095, 'flow->vlan_tci' is set to match
* that VLAN. Any existing PCP match is unchanged (it becomes 0 if
* 'flow' previously matched packets without a VLAN header).
*
* - If it is OFP_VLAN_NONE, 'flow->vlan_tci' is set to match a packet
* without a VLAN tag.
*
* - Other values of 'vid' should not be used. */
void
flow_set_dl_vlan(struct flow *flow, ovs_be16 vid)
{
if (vid == htons(OFP10_VLAN_NONE)) {
flow->vlan_tci = htons(0);
} else {
vid &= htons(VLAN_VID_MASK);
flow->vlan_tci &= ~htons(VLAN_VID_MASK);
flow->vlan_tci |= htons(VLAN_CFI) | vid;
}
}
/* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an
* OpenFlow 1.2 "vlan_vid" value, that is, the low 13 bits of 'vlan_tci' (VID
* plus CFI). */
void
flow_set_vlan_vid(struct flow *flow, ovs_be16 vid)
{
ovs_be16 mask = htons(VLAN_VID_MASK | VLAN_CFI);
flow->vlan_tci &= ~mask;
flow->vlan_tci |= vid & mask;
}
/* Sets the VLAN PCP that 'flow' matches to 'pcp', which should be in the
* range 0...7.
*
* This function has no effect on the VLAN ID that 'flow' matches.
*
* After calling this function, 'flow' will not match packets without a VLAN
* header. */
void
flow_set_vlan_pcp(struct flow *flow, uint8_t pcp)
{
pcp &= 0x07;
flow->vlan_tci &= ~htons(VLAN_PCP_MASK);
flow->vlan_tci |= htons((pcp << VLAN_PCP_SHIFT) | VLAN_CFI);
}
/* Returns the number of MPLS LSEs present in 'flow'
*
* Returns 0 if the 'dl_type' of 'flow' is not an MPLS ethernet type.
* Otherwise traverses 'flow''s MPLS label stack stopping at the
* first entry that has the BoS bit set. If no such entry exists then
* the maximum number of LSEs that can be stored in 'flow' is returned.
*/
int
flow_count_mpls_labels(const struct flow *flow, struct flow_wildcards *wc)
{
if (wc) {
wc->masks.dl_type = OVS_BE16_MAX;
}
if (eth_type_mpls(flow->dl_type)) {
int i;
int len = FLOW_MAX_MPLS_LABELS;
for (i = 0; i < len; i++) {
if (wc) {
wc->masks.mpls_lse[i] |= htonl(MPLS_BOS_MASK);
}
if (flow->mpls_lse[i] & htonl(MPLS_BOS_MASK)) {
return i + 1;
}
}
return len;
} else {
return 0;
}
}
/* Returns the number consecutive of MPLS LSEs, starting at the
* innermost LSE, that are common in 'a' and 'b'.
*
* 'an' must be flow_count_mpls_labels(a).
* 'bn' must be flow_count_mpls_labels(b).
*/
int
flow_count_common_mpls_labels(const struct flow *a, int an,
const struct flow *b, int bn,
struct flow_wildcards *wc)
{
int min_n = MIN(an, bn);
if (min_n == 0) {
return 0;
} else {
int common_n = 0;
int a_last = an - 1;
int b_last = bn - 1;
int i;
for (i = 0; i < min_n; i++) {
if (wc) {
wc->masks.mpls_lse[a_last - i] = OVS_BE32_MAX;
wc->masks.mpls_lse[b_last - i] = OVS_BE32_MAX;
}
if (a->mpls_lse[a_last - i] != b->mpls_lse[b_last - i]) {
break;
} else {
common_n++;
}
}
return common_n;
}
}
/* Adds a new outermost MPLS label to 'flow' and changes 'flow''s Ethernet type
* to 'mpls_eth_type', which must be an MPLS Ethertype.
*
* If the new label is the first MPLS label in 'flow', it is generated as;
*
* - label: 2, if 'flow' is IPv6, otherwise 0.
*
* - TTL: IPv4 or IPv6 TTL, if present and nonzero, otherwise 64.
*
* - TC: IPv4 or IPv6 TOS, if present, otherwise 0.
*
* - BoS: 1.
*
* If the new label is the second or label MPLS label in 'flow', it is
* generated as;
*
* - label: Copied from outer label.
*
* - TTL: Copied from outer label.
*
* - TC: Copied from outer label.
*
* - BoS: 0.
*
* 'n' must be flow_count_mpls_labels(flow). 'n' must be less than
* FLOW_MAX_MPLS_LABELS (because otherwise flow->mpls_lse[] would overflow).
*/
void
flow_push_mpls(struct flow *flow, int n, ovs_be16 mpls_eth_type,
struct flow_wildcards *wc)
{
ovs_assert(eth_type_mpls(mpls_eth_type));
ovs_assert(n < FLOW_MAX_MPLS_LABELS);
memset(wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
if (n) {
int i;
for (i = n; i >= 1; i--) {
flow->mpls_lse[i] = flow->mpls_lse[i - 1];
}
flow->mpls_lse[0] = (flow->mpls_lse[1]
& htonl(~MPLS_BOS_MASK));
} else {
int label = 0; /* IPv4 Explicit Null. */
int tc = 0;
int ttl = 64;
if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
label = 2;
}
if (is_ip_any(flow)) {
tc = (flow->nw_tos & IP_DSCP_MASK) >> 2;
wc->masks.nw_tos |= IP_DSCP_MASK;
if (flow->nw_ttl) {
ttl = flow->nw_ttl;
}
wc->masks.nw_ttl = 0xff;
}
flow->mpls_lse[0] = set_mpls_lse_values(ttl, tc, 1, htonl(label));
/* Clear all L3 and L4 fields. */
BUILD_ASSERT(FLOW_WC_SEQ == 27);
memset((char *) flow + FLOW_SEGMENT_2_ENDS_AT, 0,
sizeof(struct flow) - FLOW_SEGMENT_2_ENDS_AT);
}
flow->dl_type = mpls_eth_type;
}
/* Tries to remove the outermost MPLS label from 'flow'. Returns true if
* successful, false otherwise. On success, sets 'flow''s Ethernet type to
* 'eth_type'.
*
* 'n' must be flow_count_mpls_labels(flow). */
bool
flow_pop_mpls(struct flow *flow, int n, ovs_be16 eth_type,
struct flow_wildcards *wc)
{
int i;
if (n == 0) {
/* Nothing to pop. */
return false;
} else if (n == FLOW_MAX_MPLS_LABELS
&& !(flow->mpls_lse[n - 1] & htonl(MPLS_BOS_MASK))) {
/* Can't pop because we don't know what to fill in mpls_lse[n - 1]. */
return false;
}
memset(wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
for (i = 1; i < n; i++) {
flow->mpls_lse[i - 1] = flow->mpls_lse[i];
}
flow->mpls_lse[n - 1] = 0;
flow->dl_type = eth_type;
return true;
}
/* Sets the MPLS Label that 'flow' matches to 'label', which is interpreted
* as an OpenFlow 1.1 "mpls_label" value. */
void
flow_set_mpls_label(struct flow *flow, int idx, ovs_be32 label)
{
set_mpls_lse_label(&flow->mpls_lse[idx], label);
}
/* Sets the MPLS TTL that 'flow' matches to 'ttl', which should be in the
* range 0...255. */
void
flow_set_mpls_ttl(struct flow *flow, int idx, uint8_t ttl)
{
set_mpls_lse_ttl(&flow->mpls_lse[idx], ttl);
}
/* Sets the MPLS TC that 'flow' matches to 'tc', which should be in the
* range 0...7. */
void
flow_set_mpls_tc(struct flow *flow, int idx, uint8_t tc)
{
set_mpls_lse_tc(&flow->mpls_lse[idx], tc);
}
/* Sets the MPLS BOS bit that 'flow' matches to which should be 0 or 1. */
void
flow_set_mpls_bos(struct flow *flow, int idx, uint8_t bos)
{
set_mpls_lse_bos(&flow->mpls_lse[idx], bos);
}
/* Sets the entire MPLS LSE. */
void
flow_set_mpls_lse(struct flow *flow, int idx, ovs_be32 lse)
{
flow->mpls_lse[idx] = lse;
}
static size_t
flow_compose_l4(struct ofpbuf *b, const struct flow *flow)
{
size_t l4_len = 0;
if (!(flow->nw_frag & FLOW_NW_FRAG_ANY)
|| !(flow->nw_frag & FLOW_NW_FRAG_LATER)) {
if (flow->nw_proto == IPPROTO_TCP) {
struct tcp_header *tcp;
l4_len = sizeof *tcp;
tcp = ofpbuf_put_zeros(b, l4_len);
tcp->tcp_src = flow->tp_src;
tcp->tcp_dst = flow->tp_dst;
tcp->tcp_ctl = TCP_CTL(ntohs(flow->tcp_flags), 5);
} else if (flow->nw_proto == IPPROTO_UDP) {
struct udp_header *udp;
l4_len = sizeof *udp;
udp = ofpbuf_put_zeros(b, l4_len);
udp->udp_src = flow->tp_src;
udp->udp_dst = flow->tp_dst;
} else if (flow->nw_proto == IPPROTO_SCTP) {
struct sctp_header *sctp;
l4_len = sizeof *sctp;
sctp = ofpbuf_put_zeros(b, l4_len);
sctp->sctp_src = flow->tp_src;
sctp->sctp_dst = flow->tp_dst;
} else if (flow->nw_proto == IPPROTO_ICMP) {
struct icmp_header *icmp;
l4_len = sizeof *icmp;
icmp = ofpbuf_put_zeros(b, l4_len);
icmp->icmp_type = ntohs(flow->tp_src);
icmp->icmp_code = ntohs(flow->tp_dst);
icmp->icmp_csum = csum(icmp, ICMP_HEADER_LEN);
} else if (flow->nw_proto == IPPROTO_IGMP) {
struct igmp_header *igmp;
l4_len = sizeof *igmp;
igmp = ofpbuf_put_zeros(b, l4_len);
igmp->igmp_type = ntohs(flow->tp_src);
igmp->igmp_code = ntohs(flow->tp_dst);
put_16aligned_be32(&igmp->group, flow->igmp_group_ip4);
igmp->igmp_csum = csum(igmp, IGMP_HEADER_LEN);
} else if (flow->nw_proto == IPPROTO_ICMPV6) {
struct icmp6_hdr *icmp;
l4_len = sizeof *icmp;
icmp = ofpbuf_put_zeros(b, l4_len);
icmp->icmp6_type = ntohs(flow->tp_src);
icmp->icmp6_code = ntohs(flow->tp_dst);
if (icmp->icmp6_code == 0 &&
(icmp->icmp6_type == ND_NEIGHBOR_SOLICIT ||
icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) {
struct in6_addr *nd_target;
struct nd_opt_hdr *nd_opt;
l4_len += sizeof *nd_target;
nd_target = ofpbuf_put_zeros(b, sizeof *nd_target);
*nd_target = flow->nd_target;
if (!eth_addr_is_zero(flow->arp_sha)) {
l4_len += 8;
nd_opt = ofpbuf_put_zeros(b, 8);
nd_opt->nd_opt_len = 1;
nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
memcpy(nd_opt + 1, flow->arp_sha, ETH_ADDR_LEN);
}
if (!eth_addr_is_zero(flow->arp_tha)) {
l4_len += 8;
nd_opt = ofpbuf_put_zeros(b, 8);
nd_opt->nd_opt_len = 1;
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
memcpy(nd_opt + 1, flow->arp_tha, ETH_ADDR_LEN);
}
}
icmp->icmp6_cksum = (OVS_FORCE uint16_t)
csum(icmp, (char *)ofpbuf_tail(b) - (char *)icmp);
}
}
return l4_len;
}
/* Puts into 'b' a packet that flow_extract() would parse as having the given
* 'flow'.
*
* (This is useful only for testing, obviously, and the packet isn't really
* valid. It hasn't got some checksums filled in, for one, and lots of fields
* are just zeroed.) */
void
flow_compose(struct ofpbuf *b, const struct flow *flow)
{
size_t l4_len;
/* eth_compose() sets l3 pointer and makes sure it is 32-bit aligned. */
eth_compose(b, flow->dl_dst, flow->dl_src, ntohs(flow->dl_type), 0);
if (flow->dl_type == htons(FLOW_DL_TYPE_NONE)) {
struct eth_header *eth = ofpbuf_l2(b);
eth->eth_type = htons(ofpbuf_size(b));
return;
}
if (flow->vlan_tci & htons(VLAN_CFI)) {
eth_push_vlan(b, htons(ETH_TYPE_VLAN), flow->vlan_tci);
}
if (flow->dl_type == htons(ETH_TYPE_IP)) {
struct ip_header *ip;
ip = ofpbuf_put_zeros(b, sizeof *ip);
ip->ip_ihl_ver = IP_IHL_VER(5, 4);
ip->ip_tos = flow->nw_tos;
ip->ip_ttl = flow->nw_ttl;
ip->ip_proto = flow->nw_proto;
put_16aligned_be32(&ip->ip_src, flow->nw_src);
put_16aligned_be32(&ip->ip_dst, flow->nw_dst);
if (flow->nw_frag & FLOW_NW_FRAG_ANY) {
ip->ip_frag_off |= htons(IP_MORE_FRAGMENTS);
if (flow->nw_frag & FLOW_NW_FRAG_LATER) {
ip->ip_frag_off |= htons(100);
}
}
ofpbuf_set_l4(b, ofpbuf_tail(b));
l4_len = flow_compose_l4(b, flow);
ip = ofpbuf_l3(b);
ip->ip_tot_len = htons(b->l4_ofs - b->l3_ofs + l4_len);
ip->ip_csum = csum(ip, sizeof *ip);
} else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
struct ovs_16aligned_ip6_hdr *nh;
nh = ofpbuf_put_zeros(b, sizeof *nh);
put_16aligned_be32(&nh->ip6_flow, htonl(6 << 28) |
htonl(flow->nw_tos << 20) | flow->ipv6_label);
nh->ip6_hlim = flow->nw_ttl;
nh->ip6_nxt = flow->nw_proto;
memcpy(&nh->ip6_src, &flow->ipv6_src, sizeof(nh->ip6_src));
memcpy(&nh->ip6_dst, &flow->ipv6_dst, sizeof(nh->ip6_dst));
ofpbuf_set_l4(b, ofpbuf_tail(b));
l4_len = flow_compose_l4(b, flow);
nh = ofpbuf_l3(b);
nh->ip6_plen = htons(l4_len);
} else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
flow->dl_type == htons(ETH_TYPE_RARP)) {
struct arp_eth_header *arp;
arp = ofpbuf_put_zeros(b, sizeof *arp);
ofpbuf_set_l3(b, arp);
arp->ar_hrd = htons(1);
arp->ar_pro = htons(ETH_TYPE_IP);
arp->ar_hln = ETH_ADDR_LEN;
arp->ar_pln = 4;
arp->ar_op = htons(flow->nw_proto);
if (flow->nw_proto == ARP_OP_REQUEST ||
flow->nw_proto == ARP_OP_REPLY) {
put_16aligned_be32(&arp->ar_spa, flow->nw_src);
put_16aligned_be32(&arp->ar_tpa, flow->nw_dst);
memcpy(arp->ar_sha, flow->arp_sha, ETH_ADDR_LEN);
memcpy(arp->ar_tha, flow->arp_tha, ETH_ADDR_LEN);
}
}
if (eth_type_mpls(flow->dl_type)) {
int n;
b->l2_5_ofs = b->l3_ofs;
for (n = 1; n < FLOW_MAX_MPLS_LABELS; n++) {
if (flow->mpls_lse[n - 1] & htonl(MPLS_BOS_MASK)) {
break;
}
}
while (n > 0) {
push_mpls(b, flow->dl_type, flow->mpls_lse[--n]);
}
}
}
/* Compressed flow. */
static int
miniflow_n_values(const struct miniflow *flow)
{
return count_1bits(flow->map);
}
static uint32_t *
miniflow_alloc_values(struct miniflow *flow, int n)
{
int size = MINIFLOW_VALUES_SIZE(n);
if (size <= sizeof flow->inline_values) {
flow->values_inline = true;
return flow->inline_values;
} else {
COVERAGE_INC(miniflow_malloc);
flow->values_inline = false;
flow->offline_values = xmalloc(size);
return flow->offline_values;
}
}
/* Completes an initialization of 'dst' as a miniflow copy of 'src' begun by
* the caller. The caller must have already initialized 'dst->map' properly
* to indicate the significant uint32_t elements of 'src'. 'n' must be the
* number of 1-bits in 'dst->map'.
*
* Normally the significant elements are the ones that are non-zero. However,
* when a miniflow is initialized from a (mini)mask, the values can be zeroes,
* so that the flow and mask always have the same maps.
*
* This function initializes values (either inline if possible or with
* malloc() otherwise) and copies the uint32_t elements of 'src' indicated by
* 'dst->map' into it. */
static void
miniflow_init__(struct miniflow *dst, const struct flow *src, int n)
{
const uint32_t *src_u32 = (const uint32_t *) src;
uint32_t *dst_u32 = miniflow_alloc_values(dst, n);
uint64_t map;
for (map = dst->map; map; map = zero_rightmost_1bit(map)) {
*dst_u32++ = src_u32[raw_ctz(map)];
}
}
/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
* with miniflow_destroy().
* Always allocates offline storage. */
void
miniflow_init(struct miniflow *dst, const struct flow *src)
{
const uint32_t *src_u32 = (const uint32_t *) src;
unsigned int i;
int n;
/* Initialize dst->map, counting the number of nonzero elements. */
n = 0;
dst->map = 0;
for (i = 0; i < FLOW_U32S; i++) {
if (src_u32[i]) {
dst->map |= UINT64_C(1) << i;
n++;
}
}
miniflow_init__(dst, src, n);
}
/* Initializes 'dst' as a copy of 'src', using 'mask->map' as 'dst''s map. The
* caller must eventually free 'dst' with miniflow_destroy(). */
void
miniflow_init_with_minimask(struct miniflow *dst, const struct flow *src,
const struct minimask *mask)
{
dst->map = mask->masks.map;
miniflow_init__(dst, src, miniflow_n_values(dst));
}
/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
* with miniflow_destroy(). */
void
miniflow_clone(struct miniflow *dst, const struct miniflow *src)
{
int size = MINIFLOW_VALUES_SIZE(miniflow_n_values(src));
uint32_t *values;
dst->map = src->map;
if (size <= sizeof dst->inline_values) {
dst->values_inline = true;
values = dst->inline_values;
} else {
dst->values_inline = false;
COVERAGE_INC(miniflow_malloc);
dst->offline_values = xmalloc(size);
values = dst->offline_values;
}
memcpy(values, miniflow_get_values(src), size);
}
/* Initializes 'dst' as a copy of 'src'. The caller must have allocated
* 'dst' to have inline space all data in 'src'. */
void
miniflow_clone_inline(struct miniflow *dst, const struct miniflow *src,
size_t n_values)
{
dst->values_inline = true;
dst->map = src->map;
memcpy(dst->inline_values, miniflow_get_values(src),
MINIFLOW_VALUES_SIZE(n_values));
}
/* Initializes 'dst' with the data in 'src', destroying 'src'.
* The caller must eventually free 'dst' with miniflow_destroy().
* 'dst' must be regularly sized miniflow, but 'src' can have
* storage for more than the default MINI_N_INLINE inline
* values. */
void
miniflow_move(struct miniflow *dst, struct miniflow *src)
{
int size = MINIFLOW_VALUES_SIZE(miniflow_n_values(src));
dst->map = src->map;
if (size <= sizeof dst->inline_values) {
dst->values_inline = true;
memcpy(dst->inline_values, miniflow_get_values(src), size);
miniflow_destroy(src);
} else if (src->values_inline) {
dst->values_inline = false;
COVERAGE_INC(miniflow_malloc);
dst->offline_values = xmalloc(size);
memcpy(dst->offline_values, src->inline_values, size);
} else {
dst->values_inline = false;
dst->offline_values = src->offline_values;
}
}
/* Frees any memory owned by 'flow'. Does not free the storage in which 'flow'
* itself resides; the caller is responsible for that. */
void
miniflow_destroy(struct miniflow *flow)
{
if (!flow->values_inline) {
free(flow->offline_values);
}
}
/* Initializes 'dst' as a copy of 'src'. */
void
miniflow_expand(const struct miniflow *src, struct flow *dst)
{
memset(dst, 0, sizeof *dst);
flow_union_with_miniflow(dst, src);
}
/* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'flow'
* were expanded into a "struct flow". */
static uint32_t
miniflow_get(const struct miniflow *flow, unsigned int u32_ofs)
{
return (flow->map & UINT64_C(1) << u32_ofs)
? *(miniflow_get_u32_values(flow) +
count_1bits(flow->map & ((UINT64_C(1) << u32_ofs) - 1)))
: 0;
}
/* Returns true if 'a' and 'b' are the same flow, false otherwise. */
bool
miniflow_equal(const struct miniflow *a, const struct miniflow *b)
{
const uint32_t *ap = miniflow_get_u32_values(a);
const uint32_t *bp = miniflow_get_u32_values(b);
const uint64_t a_map = a->map;
const uint64_t b_map = b->map;
if (OVS_LIKELY(a_map == b_map)) {
int count = miniflow_n_values(a);
return !memcmp(ap, bp, count * sizeof *ap);
} else {
uint64_t map;
for (map = a_map | b_map; map; map = zero_rightmost_1bit(map)) {
uint64_t bit = rightmost_1bit(map);
uint64_t a_value = a_map & bit ? *ap++ : 0;
uint64_t b_value = b_map & bit ? *bp++ : 0;
if (a_value != b_value) {
return false;
}
}
}
return true;
}
/* Returns true if 'a' and 'b' are equal at the places where there are 1-bits
* in 'mask', false if they differ. */
bool
miniflow_equal_in_minimask(const struct miniflow *a, const struct miniflow *b,
const struct minimask *mask)
{
const uint32_t *p = miniflow_get_u32_values(&mask->masks);
uint64_t map;
for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
int ofs = raw_ctz(map);
if ((miniflow_get(a, ofs) ^ miniflow_get(b, ofs)) & *p++) {
return false;
}
}
return true;
}
/* Returns true if 'a' and 'b' are equal at the places where there are 1-bits
* in 'mask', false if they differ. */
bool
miniflow_equal_flow_in_minimask(const struct miniflow *a, const struct flow *b,
const struct minimask *mask)
{
const uint32_t *b_u32 = (const uint32_t *) b;
const uint32_t *p = miniflow_get_u32_values(&mask->masks);
uint64_t map;
for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
int ofs = raw_ctz(map);
if ((miniflow_get(a, ofs) ^ b_u32[ofs]) & *p++) {
return false;
}
}
return true;
}
/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
* with minimask_destroy(). */
void
minimask_init(struct minimask *mask, const struct flow_wildcards *wc)
{
miniflow_init(&mask->masks, &wc->masks);
}
/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
* with minimask_destroy(). */
void
minimask_clone(struct minimask *dst, const struct minimask *src)
{
miniflow_clone(&dst->masks, &src->masks);
}
/* Initializes 'dst' with the data in 'src', destroying 'src'.
* The caller must eventually free 'dst' with minimask_destroy(). */
void
minimask_move(struct minimask *dst, struct minimask *src)
{
miniflow_move(&dst->masks, &src->masks);
}
/* Initializes 'dst_' as the bit-wise "and" of 'a_' and 'b_'.
*
* The caller must provide room for FLOW_U32S "uint32_t"s in 'storage', for use
* by 'dst_'. The caller must *not* free 'dst_' with minimask_destroy(). */
void
minimask_combine(struct minimask *dst_,
const struct minimask *a_, const struct minimask *b_,
uint32_t storage[FLOW_U32S])
{
struct miniflow *dst = &dst_->masks;
uint32_t *dst_values = storage;
const struct miniflow *a = &a_->masks;
const struct miniflow *b = &b_->masks;
uint64_t map;
int n = 0;
dst->values_inline = false;
dst->offline_values = storage;
dst->map = 0;
for (map = a->map & b->map; map; map = zero_rightmost_1bit(map)) {
int ofs = raw_ctz(map);
uint32_t mask = miniflow_get(a, ofs) & miniflow_get(b, ofs);
if (mask) {
dst->map |= rightmost_1bit(map);
dst_values[n++] = mask;
}
}
}
/* Frees any memory owned by 'mask'. Does not free the storage in which 'mask'
* itself resides; the caller is responsible for that. */
void
minimask_destroy(struct minimask *mask)
{
miniflow_destroy(&mask->masks);
}
/* Initializes 'dst' as a copy of 'src'. */
void
minimask_expand(const struct minimask *mask, struct flow_wildcards *wc)
{
miniflow_expand(&mask->masks, &wc->masks);
}
/* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'mask'
* were expanded into a "struct flow_wildcards". */
uint32_t
minimask_get(const struct minimask *mask, unsigned int u32_ofs)
{
return miniflow_get(&mask->masks, u32_ofs);
}
/* Returns true if 'a' and 'b' are the same flow mask, false otherwise. */
bool
minimask_equal(const struct minimask *a, const struct minimask *b)
{
return miniflow_equal(&a->masks, &b->masks);
}
/* Returns true if at least one bit matched by 'b' is wildcarded by 'a',
* false otherwise. */
bool
minimask_has_extra(const struct minimask *a, const struct minimask *b)
{
const uint32_t *p = miniflow_get_u32_values(&b->masks);
uint64_t map;
for (map = b->masks.map; map; map = zero_rightmost_1bit(map)) {
uint32_t a_u32 = minimask_get(a, raw_ctz(map));
uint32_t b_u32 = *p++;
if ((a_u32 & b_u32) != b_u32) {
return true;
}
}
return false;
}
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