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flow.c
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flow.c
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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2017, 2019 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 <net/if.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 "colors.h"
#include "coverage.h"
#include "csum.h"
#include "openvswitch/dynamic-string.h"
#include "hash.h"
#include "jhash.h"
#include "openvswitch/match.h"
#include "dp-packet.h"
#include "openflow/openflow.h"
#include "packets.h"
#include "odp-util.h"
#include "random.h"
#include "unaligned.h"
#include "util.h"
#include "openvswitch/nsh.h"
#include "ovs-router.h"
#include "lib/netdev-provider.h"
COVERAGE_DEFINE(flow_extract);
COVERAGE_DEFINE(miniflow_malloc);
/* U64 indices for segmented flow classification. */
const uint8_t flow_segment_u64s[4] = {
FLOW_SEGMENT_1_ENDS_AT / sizeof(uint64_t),
FLOW_SEGMENT_2_ENDS_AT / sizeof(uint64_t),
FLOW_SEGMENT_3_ENDS_AT / sizeof(uint64_t),
FLOW_U64S
};
int flow_vlan_limit = FLOW_MAX_VLAN_HEADERS;
/* Asserts that field 'f1' follows immediately after 'f0' in struct flow,
* without any intervening padding. */
#define ASSERT_SEQUENTIAL(f0, f1) \
BUILD_ASSERT_DECL(offsetof(struct flow, f0) \
+ MEMBER_SIZEOF(struct flow, f0) \
== offsetof(struct flow, f1))
/* Asserts that fields 'f0' and 'f1' are in the same 32-bit aligned word within
* struct flow. */
#define ASSERT_SAME_WORD(f0, f1) \
BUILD_ASSERT_DECL(offsetof(struct flow, f0) / 4 \
== offsetof(struct flow, f1) / 4)
/* Asserts that 'f0' and 'f1' are both sequential and within the same 32-bit
* aligned word in struct flow. */
#define ASSERT_SEQUENTIAL_SAME_WORD(f0, f1) \
ASSERT_SEQUENTIAL(f0, f1); \
ASSERT_SAME_WORD(f0, f1)
/* miniflow_extract() assumes the following to be true to optimize the
* extraction process. */
ASSERT_SEQUENTIAL_SAME_WORD(nw_frag, nw_tos);
ASSERT_SEQUENTIAL_SAME_WORD(nw_tos, nw_ttl);
ASSERT_SEQUENTIAL_SAME_WORD(nw_ttl, nw_proto);
/* TCP flags in the middle of a BE64, zeroes in the other half. */
BUILD_ASSERT_DECL(offsetof(struct flow, tcp_flags) % 8 == 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
ASSERT_SEQUENTIAL_SAME_WORD(tp_src, tp_dst);
/* 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(const void **datap, size_t *sizep, size_t size)
{
const char *data = *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(const 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 {
struct flowmap map;
uint64_t *data;
uint64_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 != 41)
#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
/* True if 'IDX' and higher bits are not set. */
#define ASSERT_FLOWMAP_NOT_SET(FM, IDX) \
{ \
MINIFLOW_ASSERT(!((FM)->bits[(IDX) / MAP_T_BITS] & \
(MAP_MAX << ((IDX) % MAP_T_BITS)))); \
for (size_t i = (IDX) / MAP_T_BITS + 1; i < FLOWMAP_UNITS; i++) { \
MINIFLOW_ASSERT(!(FM)->bits[i]); \
} \
}
#define miniflow_set_map(MF, OFS) \
{ \
ASSERT_FLOWMAP_NOT_SET(&MF.map, (OFS)); \
flowmap_set(&MF.map, (OFS), 1); \
}
#define miniflow_assert_in_map(MF, OFS) \
MINIFLOW_ASSERT(flowmap_is_set(&MF.map, (OFS))); \
ASSERT_FLOWMAP_NOT_SET(&MF.map, (OFS) + 1)
#define miniflow_push_uint64_(MF, OFS, VALUE) \
{ \
MINIFLOW_ASSERT(MF.data < MF.end && (OFS) % 8 == 0); \
*MF.data++ = VALUE; \
miniflow_set_map(MF, OFS / 8); \
}
#define miniflow_push_be64_(MF, OFS, VALUE) \
miniflow_push_uint64_(MF, OFS, (OVS_FORCE uint64_t)(VALUE))
#define miniflow_push_uint32_(MF, OFS, VALUE) \
{ \
MINIFLOW_ASSERT(MF.data < MF.end); \
\
if ((OFS) % 8 == 0) { \
miniflow_set_map(MF, OFS / 8); \
*(uint32_t *)MF.data = VALUE; \
} else if ((OFS) % 8 == 4) { \
miniflow_assert_in_map(MF, OFS / 8); \
*((uint32_t *)MF.data + 1) = VALUE; \
MF.data++; \
} \
}
#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); \
\
if ((OFS) % 8 == 0) { \
miniflow_set_map(MF, OFS / 8); \
*(uint16_t *)MF.data = VALUE; \
} else if ((OFS) % 8 == 2) { \
miniflow_assert_in_map(MF, OFS / 8); \
*((uint16_t *)MF.data + 1) = VALUE; \
} else if ((OFS) % 8 == 4) { \
miniflow_assert_in_map(MF, OFS / 8); \
*((uint16_t *)MF.data + 2) = VALUE; \
} else if ((OFS) % 8 == 6) { \
miniflow_assert_in_map(MF, OFS / 8); \
*((uint16_t *)MF.data + 3) = VALUE; \
MF.data++; \
} \
}
#define miniflow_push_uint8_(MF, OFS, VALUE) \
{ \
MINIFLOW_ASSERT(MF.data < MF.end); \
\
if ((OFS) % 8 == 0) { \
miniflow_set_map(MF, OFS / 8); \
*(uint8_t *)MF.data = VALUE; \
} else if ((OFS) % 8 == 7) { \
miniflow_assert_in_map(MF, OFS / 8); \
*((uint8_t *)MF.data + 7) = VALUE; \
MF.data++; \
} else { \
miniflow_assert_in_map(MF, OFS / 8); \
*((uint8_t *)MF.data + ((OFS) % 8)) = VALUE; \
} \
}
#define miniflow_pad_to_64_(MF, OFS) \
{ \
MINIFLOW_ASSERT((OFS) % 8 != 0); \
miniflow_assert_in_map(MF, OFS / 8); \
\
memset((uint8_t *)MF.data + (OFS) % 8, 0, 8 - (OFS) % 8); \
MF.data++; \
}
#define miniflow_pad_from_64_(MF, OFS) \
{ \
MINIFLOW_ASSERT(MF.data < MF.end); \
\
MINIFLOW_ASSERT((OFS) % 8 != 0); \
miniflow_set_map(MF, OFS / 8); \
\
memset((uint8_t *)MF.data, 0, (OFS) % 8); \
}
#define miniflow_push_be16_(MF, OFS, VALUE) \
miniflow_push_uint16_(MF, OFS, (OVS_FORCE uint16_t)VALUE);
#define miniflow_push_be8_(MF, OFS, VALUE) \
miniflow_push_uint8_(MF, OFS, (OVS_FORCE uint8_t)VALUE);
#define miniflow_set_maps(MF, OFS, N_WORDS) \
{ \
size_t ofs = (OFS); \
size_t n_words = (N_WORDS); \
\
MINIFLOW_ASSERT(n_words && MF.data + n_words <= MF.end); \
ASSERT_FLOWMAP_NOT_SET(&MF.map, ofs); \
flowmap_set(&MF.map, ofs, n_words); \
}
/* Data at 'valuep' may be unaligned. */
#define miniflow_push_words_(MF, OFS, VALUEP, N_WORDS) \
{ \
MINIFLOW_ASSERT((OFS) % 8 == 0); \
miniflow_set_maps(MF, (OFS) / 8, (N_WORDS)); \
memcpy(MF.data, (VALUEP), (N_WORDS) * sizeof *MF.data); \
MF.data += (N_WORDS); \
}
/* Push 32-bit words padded to 64-bits. */
#define miniflow_push_words_32_(MF, OFS, VALUEP, N_WORDS) \
{ \
miniflow_set_maps(MF, (OFS) / 8, DIV_ROUND_UP(N_WORDS, 2)); \
memcpy(MF.data, (VALUEP), (N_WORDS) * sizeof(uint32_t)); \
MF.data += DIV_ROUND_UP(N_WORDS, 2); \
if ((N_WORDS) & 1) { \
*((uint32_t *)MF.data - 1) = 0; \
} \
}
/* Data at 'valuep' may be unaligned. */
/* MACs start 64-aligned, and must be followed by other data or padding. */
#define miniflow_push_macs_(MF, OFS, VALUEP) \
{ \
miniflow_set_maps(MF, (OFS) / 8, 2); \
memcpy(MF.data, (VALUEP), 2 * ETH_ADDR_LEN); \
MF.data += 1; /* First word only. */ \
}
#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_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_uint8(MF, FIELD, VALUE) \
miniflow_push_uint8_(MF, offsetof(struct flow, FIELD), VALUE)
#define miniflow_pad_to_64(MF, FIELD) \
miniflow_pad_to_64_(MF, OFFSETOFEND(struct flow, FIELD))
#define miniflow_pad_from_64(MF, FIELD) \
miniflow_pad_from_64_(MF, offsetof(struct flow, FIELD))
#define miniflow_push_words(MF, FIELD, VALUEP, N_WORDS) \
miniflow_push_words_(MF, offsetof(struct flow, FIELD), VALUEP, N_WORDS)
#define miniflow_push_words_32(MF, FIELD, VALUEP, N_WORDS) \
miniflow_push_words_32_(MF, offsetof(struct flow, FIELD), VALUEP, N_WORDS)
#define miniflow_push_macs(MF, FIELD, VALUEP) \
miniflow_push_macs_(MF, offsetof(struct flow, FIELD), VALUEP)
/* Return the pointer to the miniflow data when called BEFORE the corresponding
* push. */
#define miniflow_pointer(MF, FIELD) \
(void *)((uint8_t *)MF.data + ((offsetof(struct flow, FIELD)) % 8))
/* Pulls the MPLS headers at '*datap' and returns the count of them. */
static inline int
parse_mpls(const 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);
}
/* passed vlan_hdrs arg must be at least size FLOW_MAX_VLAN_HEADERS. */
static inline ALWAYS_INLINE size_t
parse_vlan(const void **datap, size_t *sizep, union flow_vlan_hdr *vlan_hdrs)
{
const ovs_be16 *eth_type;
memset(vlan_hdrs, 0, sizeof(union flow_vlan_hdr) * FLOW_MAX_VLAN_HEADERS);
data_pull(datap, sizep, ETH_ADDR_LEN * 2);
eth_type = *datap;
size_t n;
for (n = 0; eth_type_vlan(*eth_type) && n < flow_vlan_limit; n++) {
if (OVS_UNLIKELY(*sizep < sizeof(ovs_be32) + sizeof(ovs_be16))) {
break;
}
const ovs_16aligned_be32 *qp = data_pull(datap, sizep, sizeof *qp);
vlan_hdrs[n].qtag = get_16aligned_be32(qp);
vlan_hdrs[n].tci |= htons(VLAN_CFI);
eth_type = *datap;
}
return n;
}
static inline ALWAYS_INLINE ovs_be16
parse_ethertype(const 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);
}
/* Returns 'true' if the packet is an ND packet. In that case the '*nd_target'
* and 'arp_buf[]' are filled in. If the packet is not an ND packet, 'false'
* is returned and no values are filled in on '*nd_target' or 'arp_buf[]'. */
static inline bool
parse_icmpv6(const void **datap, size_t *sizep, const struct icmp6_hdr *icmp,
uint32_t *rso_flags, const struct in6_addr **nd_target,
struct eth_addr arp_buf[2], uint8_t *opt_type)
{
const uint32_t *reserved;
if (icmp->icmp6_code != 0 ||
(icmp->icmp6_type != ND_NEIGHBOR_SOLICIT &&
icmp->icmp6_type != ND_NEIGHBOR_ADVERT)) {
return false;
}
arp_buf[0] = eth_addr_zero;
arp_buf[1] = eth_addr_zero;
*opt_type = 0;
reserved = data_try_pull(datap, sizep, sizeof(uint32_t));
if (OVS_UNLIKELY(!reserved)) {
/* Invalid ND packet. */
return false;
}
*rso_flags = *reserved;
*nd_target = data_try_pull(datap, sizep, sizeof **nd_target);
if (OVS_UNLIKELY(!*nd_target)) {
return true;
}
while (*sizep >= 8) {
/* The minimum size of an option is 8 bytes, which also is
* the size of Ethernet link-layer options. */
const struct ovs_nd_lla_opt *lla_opt = *datap;
int opt_len = lla_opt->len * ND_LLA_OPT_LEN;
if (!opt_len || opt_len > *sizep) {
return true;
}
/* 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 (lla_opt->type == ND_OPT_SOURCE_LINKADDR && opt_len == 8) {
if (OVS_LIKELY(eth_addr_is_zero(arp_buf[0]))) {
arp_buf[0] = lla_opt->mac;
/* We use only first option type present in ND packet. */
if (*opt_type == 0) {
*opt_type = lla_opt->type;
}
} else {
goto invalid;
}
} else if (lla_opt->type == ND_OPT_TARGET_LINKADDR && opt_len == 8) {
if (OVS_LIKELY(eth_addr_is_zero(arp_buf[1]))) {
arp_buf[1] = lla_opt->mac;
/* We use only first option type present in ND packet. */
if (*opt_type == 0) {
*opt_type = lla_opt->type;
}
} else {
goto invalid;
}
}
if (OVS_UNLIKELY(!data_try_pull(datap, sizep, opt_len))) {
return true;
}
}
return true;
invalid:
*nd_target = NULL;
arp_buf[0] = eth_addr_zero;
arp_buf[1] = eth_addr_zero;
return true;
}
static inline bool
parse_ipv6_ext_hdrs__(const void **datap, size_t *sizep, uint8_t *nw_proto,
uint8_t *nw_frag,
const struct ovs_16aligned_ip6_frag **frag_hdr)
{
*frag_hdr = NULL;
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'. */
return true;
}
/* 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(*sizep < 8)) {
return false;
}
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 = *datap;
*nw_proto = ext_hdr->ip6e_nxt;
if (OVS_UNLIKELY(!data_try_pull(datap, sizep,
(ext_hdr->ip6e_len + 1) * 8))) {
return false;
}
} 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 = *datap;
*nw_proto = ext_hdr->ip6e_nxt;
if (OVS_UNLIKELY(!data_try_pull(datap, sizep,
(ext_hdr->ip6e_len + 2) * 4))) {
return false;
}
} else if (*nw_proto == IPPROTO_FRAGMENT) {
*frag_hdr = *datap;
*nw_proto = (*frag_hdr)->ip6f_nxt;
if (!data_try_pull(datap, sizep, sizeof **frag_hdr)) {
return false;
}
/* 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;
return true;
}
}
}
}
}
/* Parses IPv6 extension headers until a terminal header (or header we
* don't understand) is found. 'datap' points to the first extension
* header and advances as parsing occurs; 'sizep' is the remaining size
* and is decreased accordingly. 'nw_proto' starts as the first
* extension header to process and is updated as the extension headers
* are parsed.
*
* If a fragment header is found, '*frag_hdr' is set to the fragment
* header and otherwise set to NULL. If it is the first fragment,
* extension header parsing otherwise continues as usual. If it's not
* the first fragment, 'nw_proto' is set to IPPROTO_FRAGMENT and 'nw_frag'
* has FLOW_NW_FRAG_LATER set. Both first and later fragments have
* FLOW_NW_FRAG_ANY set in 'nw_frag'.
*
* A return value of false indicates that there was a problem parsing
* the extension headers.*/
bool
parse_ipv6_ext_hdrs(const void **datap, size_t *sizep, uint8_t *nw_proto,
uint8_t *nw_frag,
const struct ovs_16aligned_ip6_frag **frag_hdr)
{
return parse_ipv6_ext_hdrs__(datap, sizep, nw_proto, nw_frag,
frag_hdr);
}
bool
parse_nsh(const void **datap, size_t *sizep, struct ovs_key_nsh *key)
{
const struct nsh_hdr *nsh = (const struct nsh_hdr *) *datap;
uint8_t version, length, flags, ttl;
/* Check if it is long enough for NSH header, doesn't support
* MD type 2 yet
*/
if (OVS_UNLIKELY(*sizep < NSH_BASE_HDR_LEN)) {
return false;
}
version = nsh_get_ver(nsh);
flags = nsh_get_flags(nsh);
length = nsh_hdr_len(nsh);
ttl = nsh_get_ttl(nsh);
if (OVS_UNLIKELY(length > *sizep || version != 0)) {
return false;
}
key->flags = flags;
key->ttl = ttl;
key->mdtype = nsh->md_type;
key->np = nsh->next_proto;
key->path_hdr = nsh_get_path_hdr(nsh);
switch (key->mdtype) {
case NSH_M_TYPE1:
if (length != NSH_M_TYPE1_LEN) {
return false;
}
for (size_t i = 0; i < 4; i++) {
key->context[i] = get_16aligned_be32(&nsh->md1.context[i]);
}
break;
case NSH_M_TYPE2:
/* Don't support MD type 2 metedata parsing yet */
if (length < NSH_BASE_HDR_LEN) {
return false;
}
memset(key->context, 0, sizeof(key->context));
break;
default:
/* We don't parse other context headers yet. */
memset(key->context, 0, sizeof(key->context));
break;
}
data_pull(datap, sizep, length);
return true;
}
/* This does the same thing as miniflow_extract() with a full-size 'flow' as
* the destination. */
void
flow_extract(struct dp_packet *packet, struct flow *flow)
{
struct {
struct miniflow mf;
uint64_t buf[FLOW_U64S];
} m;
COVERAGE_INC(flow_extract);
miniflow_extract(packet, &m.mf);
miniflow_expand(&m.mf, flow);
}
static inline bool
ipv4_sanity_check(const struct ip_header *nh, size_t size,
int *ip_lenp, uint16_t *tot_lenp)
{
int ip_len;
uint16_t tot_len;
if (OVS_UNLIKELY(size < IP_HEADER_LEN)) {
return false;
}
ip_len = IP_IHL(nh->ip_ihl_ver) * 4;
if (OVS_UNLIKELY(ip_len < IP_HEADER_LEN || size < ip_len)) {
return false;
}
tot_len = ntohs(nh->ip_tot_len);
if (OVS_UNLIKELY(tot_len > size || ip_len > tot_len ||
size - tot_len > UINT8_MAX)) {
return false;
}
*ip_lenp = ip_len;
*tot_lenp = tot_len;
return true;
}
static inline uint8_t
ipv4_get_nw_frag(const struct ip_header *nh)
{
uint8_t nw_frag = 0;
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;
}
}
return nw_frag;
}
static inline bool
ipv6_sanity_check(const struct ovs_16aligned_ip6_hdr *nh, size_t size)
{
uint16_t plen;
if (OVS_UNLIKELY(size < sizeof *nh)) {
return false;
}
plen = ntohs(nh->ip6_plen);
if (OVS_UNLIKELY(plen + IPV6_HEADER_LEN > size)) {
return false;
}
/* Jumbo Payload option not supported yet. */
if (OVS_UNLIKELY(size - plen > UINT8_MAX)) {
return false;
}
return true;
}
/* Initializes 'dst' from 'packet' and 'md', taking the packet type into
* account. 'dst' must have enough space for FLOW_U64S * 8 bytes.
*
* Initializes the layer offsets as follows:
*
* - packet->l2_5_ofs to the
* * the start of the MPLS shim header. Can be zero, if the
* packet is of type (OFPHTN_ETHERTYPE, ETH_TYPE_MPLS).
* * UINT16_MAX when there is no MPLS shim header.
*
* - packet->l3_ofs is set to
* * zero if the packet_type is in name space OFPHTN_ETHERTYPE
* and there is no MPLS shim header.
* * 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 if the packet type is Ethernet and there is
* no MPLS shim header.
* * just past the MPLS label stack to the first byte of the MPLS
* payload if there is at least one MPLS shim header.
* * UINT16_MAX if the packet type is Ethernet and the frame is
* too short to contain an Ethernet header.
*
* - packet->l4_ofs is set to just past the IPv4 or IPv6 header, if one is
* present and the packet has at least the content used for the fields
* of interest for the flow, otherwise UINT16_MAX.
*/
void
miniflow_extract(struct dp_packet *packet, struct miniflow *dst)
{
/* Add code to this function (or its callees) to extract new fields. */
BUILD_ASSERT_DECL(FLOW_WC_SEQ == 41);
const struct pkt_metadata *md = &packet->md;
const void *data = dp_packet_data(packet);
size_t size = dp_packet_size(packet);
ovs_be32 packet_type = packet->packet_type;
uint64_t *values = miniflow_values(dst);
struct mf_ctx mf = { FLOWMAP_EMPTY_INITIALIZER, values,
values + FLOW_U64S };
const char *frame;
ovs_be16 dl_type = OVS_BE16_MAX;
uint8_t nw_frag, nw_tos, nw_ttl, nw_proto;
uint8_t *ct_nw_proto_p = NULL;
ovs_be16 ct_tp_src = 0, ct_tp_dst = 0;
/* Metadata. */
if (flow_tnl_dst_is_set(&md->tunnel)) {
miniflow_push_words(mf, tunnel, &md->tunnel,
offsetof(struct flow_tnl, metadata) /
sizeof(uint64_t));
if (!(md->tunnel.flags & FLOW_TNL_F_UDPIF)) {
if (md->tunnel.metadata.present.map) {
miniflow_push_words(mf, tunnel.metadata, &md->tunnel.metadata,
sizeof md->tunnel.metadata /
sizeof(uint64_t));
}
} else {
if (md->tunnel.metadata.present.len) {
miniflow_push_words(mf, tunnel.metadata.present,
&md->tunnel.metadata.present, 1);
miniflow_push_words(mf, tunnel.metadata.opts.gnv,
md->tunnel.metadata.opts.gnv,
DIV_ROUND_UP(md->tunnel.metadata.present.len,
sizeof(uint64_t)));
}
}
}
if (md->skb_priority || md->pkt_mark) {
miniflow_push_uint32(mf, skb_priority, md->skb_priority);
miniflow_push_uint32(mf, pkt_mark, md->pkt_mark);
}
miniflow_push_uint32(mf, dp_hash, md->dp_hash);
miniflow_push_uint32(mf, in_port, odp_to_u32(md->in_port.odp_port));
if (md->ct_state) {
miniflow_push_uint32(mf, recirc_id, md->recirc_id);
miniflow_push_uint8(mf, ct_state, md->ct_state);
ct_nw_proto_p = miniflow_pointer(mf, ct_nw_proto);
miniflow_push_uint8(mf, ct_nw_proto, 0);
miniflow_push_uint16(mf, ct_zone, md->ct_zone);
} else if (md->recirc_id) {
miniflow_push_uint32(mf, recirc_id, md->recirc_id);
miniflow_pad_to_64(mf, recirc_id);
}
if (md->ct_state) {
miniflow_push_uint32(mf, ct_mark, md->ct_mark);
miniflow_push_be32(mf, packet_type, packet_type);
if (!ovs_u128_is_zero(md->ct_label)) {
miniflow_push_words(mf, ct_label, &md->ct_label,
sizeof md->ct_label / sizeof(uint64_t));
}
} else {
miniflow_pad_from_64(mf, packet_type);
miniflow_push_be32(mf, packet_type, packet_type);
}
/* Initialize packet's layer pointer and offsets. */
frame = data;
dp_packet_reset_offsets(packet);
if (packet_type == htonl(PT_ETH)) {
/* Must have full Ethernet header to proceed. */
if (OVS_UNLIKELY(size < sizeof(struct eth_header))) {
goto out;
} else {
/* Link layer. */
ASSERT_SEQUENTIAL(dl_dst, dl_src);
miniflow_push_macs(mf, dl_dst, data);
/* VLAN */
union flow_vlan_hdr vlans[FLOW_MAX_VLAN_HEADERS];
size_t num_vlans = parse_vlan(&data, &size, vlans);
dl_type = parse_ethertype(&data, &size);
miniflow_push_be16(mf, dl_type, dl_type);
miniflow_pad_to_64(mf, dl_type);
if (num_vlans > 0) {
miniflow_push_words_32(mf, vlans, vlans, num_vlans);
}
}
} else {
/* Take dl_type from packet_type. */
dl_type = pt_ns_type_be(packet_type);
miniflow_pad_from_64(mf, dl_type);
miniflow_push_be16(mf, dl_type, dl_type);
/* Do not push vlan_tci, pad instead */
miniflow_pad_to_64(mf, dl_type);
}
/* Parse mpls. */
if (OVS_UNLIKELY(eth_type_mpls(dl_type))) {
int count;
const void *mpls = data;
packet->l2_5_ofs = (char *)data - frame;
count = parse_mpls(&data, &size);
miniflow_push_words_32(mf, mpls_lse, mpls, count);
}
/* Network layer. */
packet->l3_ofs = (char *)data - frame;
nw_frag = 0;
if (OVS_LIKELY(dl_type == htons(ETH_TYPE_IP))) {
const struct ip_header *nh = data;
int ip_len;
uint16_t tot_len;
if (OVS_UNLIKELY(!ipv4_sanity_check(nh, size, &ip_len, &tot_len))) {
goto out;
}
dp_packet_set_l2_pad_size(packet, size - tot_len);
size = tot_len; /* Never pull padding. */
/* Push both source and destination address at once. */
miniflow_push_words(mf, nw_src, &nh->ip_src, 1);
if (ct_nw_proto_p && !md->ct_orig_tuple_ipv6) {
*ct_nw_proto_p = md->ct_orig_tuple.ipv4.ipv4_proto;
if (*ct_nw_proto_p) {
miniflow_push_words(mf, ct_nw_src,
&md->ct_orig_tuple.ipv4.ipv4_src, 1);
ct_tp_src = md->ct_orig_tuple.ipv4.src_port;
ct_tp_dst = md->ct_orig_tuple.ipv4.dst_port;
}
}
miniflow_push_be32(mf, ipv6_label, 0); /* Padding for IPv4. */
nw_tos = nh->ip_tos;
nw_ttl = nh->ip_ttl;
nw_proto = nh->ip_proto;
nw_frag = ipv4_get_nw_frag(nh);
data_pull(&data, &size, ip_len);
} else if (dl_type == htons(ETH_TYPE_IPV6)) {
const struct ovs_16aligned_ip6_hdr *nh = data;
ovs_be32 tc_flow;
uint16_t plen;
if (OVS_UNLIKELY(!ipv6_sanity_check(nh, size))) {
goto out;
}
data_pull(&data, &size, sizeof *nh);
plen = ntohs(nh->ip6_plen);
dp_packet_set_l2_pad_size(packet, size - plen);
size = plen; /* Never pull padding. */
miniflow_push_words(mf, ipv6_src, &nh->ip6_src,
sizeof nh->ip6_src / 8);
miniflow_push_words(mf, ipv6_dst, &nh->ip6_dst,
sizeof nh->ip6_dst / 8);
if (ct_nw_proto_p && md->ct_orig_tuple_ipv6) {
*ct_nw_proto_p = md->ct_orig_tuple.ipv6.ipv6_proto;
if (*ct_nw_proto_p) {
miniflow_push_words(mf, ct_ipv6_src,
&md->ct_orig_tuple.ipv6.ipv6_src,
2 *
sizeof md->ct_orig_tuple.ipv6.ipv6_src / 8);
ct_tp_src = md->ct_orig_tuple.ipv6.src_port;
ct_tp_dst = md->ct_orig_tuple.ipv6.dst_port;
}
}
tc_flow = get_16aligned_be32(&nh->ip6_flow);
nw_tos = ntohl(tc_flow) >> 20;
nw_ttl = nh->ip6_hlim;
nw_proto = nh->ip6_nxt;
const struct ovs_16aligned_ip6_frag *frag_hdr;
if (!parse_ipv6_ext_hdrs__(&data, &size, &nw_proto, &nw_frag,
&frag_hdr)) {
goto out;
}
/* This needs to be after the parse_ipv6_ext_hdrs__() call because it
* leaves the nw_frag word uninitialized. */
ASSERT_SEQUENTIAL(ipv6_label, nw_frag);
ovs_be32 label = tc_flow & htonl(IPV6_LABEL_MASK);
miniflow_push_be32(mf, ipv6_label, label);
} else {
if (dl_type == htons(ETH_TYPE_ARP) ||
dl_type == htons(ETH_TYPE_RARP)) {
struct eth_addr arp_buf[2];
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_be32(mf, nw_src,
get_16aligned_be32(&arp->ar_spa));
miniflow_push_be32(mf, nw_dst,
get_16aligned_be32(&arp->ar_tpa));
/* We only match on the lower 8 bits of the opcode. */
if (OVS_LIKELY(ntohs(arp->ar_op) <= 0xff)) {
miniflow_push_be32(mf, ipv6_label, 0); /* Pad with ARP. */
miniflow_push_be32(mf, nw_frag, htonl(ntohs(arp->ar_op)));
}
/* Must be adjacent. */
ASSERT_SEQUENTIAL(arp_sha, arp_tha);
arp_buf[0] = arp->ar_sha;
arp_buf[1] = arp->ar_tha;
miniflow_push_macs(mf, arp_sha, arp_buf);
miniflow_pad_to_64(mf, arp_tha);
}
} else if (dl_type == htons(ETH_TYPE_NSH)) {
struct ovs_key_nsh nsh;
if (OVS_LIKELY(parse_nsh(&data, &size, &nsh))) {
miniflow_push_words(mf, nsh, &nsh,
sizeof(struct ovs_key_nsh) /
sizeof(uint64_t));
}
}
goto out;
}
packet->l4_ofs = (char *)data - frame;
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, arp_tha.ea[2], 0);
miniflow_push_be32(mf, tcp_flags,
TCP_FLAGS_BE32(tcp->tcp_ctl));
miniflow_push_be16(mf, tp_src, tcp->tcp_src);
miniflow_push_be16(mf, tp_dst, tcp->tcp_dst);
miniflow_push_be16(mf, ct_tp_src, ct_tp_src);
miniflow_push_be16(mf, ct_tp_dst, ct_tp_dst);
}
} else if (OVS_LIKELY(nw_proto == IPPROTO_UDP)) {
if (OVS_LIKELY(size >= UDP_HEADER_LEN)) {
const struct udp_header *udp = data;
miniflow_push_be16(mf, tp_src, udp->udp_src);
miniflow_push_be16(mf, tp_dst, udp->udp_dst);
miniflow_push_be16(mf, ct_tp_src, ct_tp_src);
miniflow_push_be16(mf, ct_tp_dst, ct_tp_dst);
}
} else if (OVS_LIKELY(nw_proto == IPPROTO_SCTP)) {
if (OVS_LIKELY(size >= SCTP_HEADER_LEN)) {