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flow.c
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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 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 "dp-packet.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);
/* 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
};
/* 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(dl_type, vlan_tci);
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 != 33)
#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] & \
(FLOWMAP_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_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_push_be16_(MF, OFS, VALUE) \
miniflow_push_uint16_(MF, OFS, (OVS_FORCE uint16_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_pad_to_64(MF, FIELD) \
miniflow_pad_to_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)
/* 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);
}
static inline ovs_be16
parse_vlan(const 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(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);
}
static inline void
parse_icmpv6(const void **datap, size_t *sizep, const struct icmp6_hdr *icmp,
const struct in6_addr **nd_target,
struct eth_addr arp_buf[2])
{
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;
}
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_opt *nd_opt = *datap;
int opt_len = nd_opt->nd_opt_len * ND_OPT_LEN;
if (!opt_len || opt_len > *sizep) {
return;
}
/* 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]))) {
arp_buf[0] = nd_opt->nd_opt_mac;
} 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]))) {
arp_buf[1] = nd_opt->nd_opt_mac;
} else {
goto invalid;
}
}
if (OVS_UNLIKELY(!data_try_pull(datap, sizep, opt_len))) {
return;
}
}
}
return;
invalid:
*nd_target = NULL;
arp_buf[0] = eth_addr_zero;
arp_buf[1] = eth_addr_zero;
}
/* 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 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);
}
/* Caller is responsible for initializing 'dst' with enough storage for
* FLOW_U64S * 8 bytes. */
void
miniflow_extract(struct dp_packet *packet, struct miniflow *dst)
{
const struct pkt_metadata *md = &packet->md;
const void *data = dp_packet_data(packet);
size_t size = dp_packet_size(packet);
uint64_t *values = miniflow_values(dst);
struct mf_ctx mf = { FLOWMAP_EMPTY_INITIALIZER, values,
values + FLOW_U64S };
const char *l2;
ovs_be16 dl_type;
uint8_t nw_frag, nw_tos, nw_ttl, nw_proto;
/* Metadata. */
if (md->tunnel.ip_dst) {
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->recirc_id) {
miniflow_push_uint32(mf, recirc_id, md->recirc_id);
miniflow_pad_to_64(mf, conj_id);
}
/* Initialize packet's layer pointer and offsets. */
l2 = data;
dp_packet_reset_offsets(packet);
/* Must have full Ethernet header to proceed. */
if (OVS_UNLIKELY(size < sizeof(struct eth_header))) {
goto out;
} else {
ovs_be16 vlan_tci;
/* Link layer. */
ASSERT_SEQUENTIAL(dl_dst, dl_src);
miniflow_push_macs(mf, dl_dst, data);
/* 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_32(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;
uint16_t tot_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;
}
if (OVS_UNLIKELY(size < ip_len)) {
goto out;
}
tot_len = ntohs(nh->ip_tot_len);
if (OVS_UNLIKELY(tot_len > size)) {
goto out;
}
if (OVS_UNLIKELY(size - tot_len > UINT8_MAX)) {
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);
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;
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;
}
}
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;
uint16_t plen;
if (OVS_UNLIKELY(size < sizeof *nh)) {
goto out;
}
nh = data_pull(&data, &size, sizeof *nh);
plen = ntohs(nh->ip6_plen);
if (OVS_UNLIKELY(plen > size)) {
goto out;
}
/* Jumbo Payload option not supported yet. */
if (OVS_UNLIKELY(size - plen > UINT8_MAX)) {
goto out;
}
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);
tc_flow = get_16aligned_be32(&nh->ip6_flow);
{
ovs_be32 label = tc_flow & htonl(IPV6_LABEL_MASK);
miniflow_push_be32(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)) {
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, tcp_flags);
}
}
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, 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_pad_to_64(mf, igmp_group_ip4);
}
} 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_pad_to_64(mf, igmp_group_ip4);
}
} else if (OVS_LIKELY(nw_proto == IPPROTO_SCTP)) {
if (OVS_LIKELY(size >= SCTP_HEADER_LEN)) {
const struct sctp_header *sctp = data;
miniflow_push_be16(mf, tp_src, sctp->sctp_src);
miniflow_push_be16(mf, tp_dst, sctp->sctp_dst);
miniflow_pad_to_64(mf, igmp_group_ip4);
}
} 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));
miniflow_pad_to_64(mf, igmp_group_ip4);
}
} 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;
struct eth_addr arp_buf[2] = { { { { 0 } } } };
const struct icmp6_hdr *icmp = data_pull(&data, &size,
sizeof *icmp);
parse_icmpv6(&data, &size, icmp, &nd_target, arp_buf);
if (nd_target) {
miniflow_push_words(mf, nd_target, nd_target,
sizeof *nd_target / sizeof(uint64_t));
}
miniflow_push_macs(mf, arp_sha, arp_buf);
miniflow_pad_to_64(mf, tcp_flags);
miniflow_push_be16(mf, tp_src, htons(icmp->icmp6_type));
miniflow_push_be16(mf, tp_dst, htons(icmp->icmp6_code));
miniflow_pad_to_64(mf, igmp_group_ip4);
}
}
}
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)
{
uint64_t *flow_u64 = (uint64_t *) flow;
const uint64_t *wc_u64 = (const uint64_t *) &wildcards->masks;
size_t i;
for (i = 0; i < FLOW_U64S; i++) {
flow_u64[i] &= wc_u64[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 'flow_metadata' with the metadata found in 'flow'. */
void
flow_get_metadata(const struct flow *flow, struct match *flow_metadata)
{
int i;
BUILD_ASSERT_DECL(FLOW_WC_SEQ == 33);
match_init_catchall(flow_metadata);
if (flow->tunnel.tun_id != htonll(0)) {
match_set_tun_id(flow_metadata, flow->tunnel.tun_id);
}
if (flow->tunnel.flags & FLOW_TNL_PUB_F_MASK) {
match_set_tun_flags(flow_metadata,
flow->tunnel.flags & FLOW_TNL_PUB_F_MASK);
}
if (flow->tunnel.ip_src != htonl(0)) {
match_set_tun_src(flow_metadata, flow->tunnel.ip_src);
}
if (flow->tunnel.ip_dst != htonl(0)) {
match_set_tun_dst(flow_metadata, flow->tunnel.ip_dst);
}
if (flow->tunnel.gbp_id != htons(0)) {
match_set_tun_gbp_id(flow_metadata, flow->tunnel.gbp_id);
}
if (flow->tunnel.gbp_flags) {
match_set_tun_gbp_flags(flow_metadata, flow->tunnel.gbp_flags);
}
tun_metadata_get_fmd(&flow->tunnel, flow_metadata);
if (flow->metadata != htonll(0)) {
match_set_metadata(flow_metadata, flow->metadata);
}
for (i = 0; i < FLOW_N_REGS; i++) {
if (flow->regs[i]) {
match_set_reg(flow_metadata, i, flow->regs[i]);
}
}
if (flow->pkt_mark != 0) {
match_set_pkt_mark(flow_metadata, flow->pkt_mark);
}
match_set_in_port(flow_metadata, 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) {
ds_put_char(ds, '0');
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, uint32_t max_mask)
{
if (name) {
ds_put_format(ds, "%s=", name);
}
if (mask == max_mask) {
format_flags(ds, bit_to_string, flags, '|');
return;
}
if (!mask) {
ds_put_cstr(ds, "0/0");
return;
}
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;
}
}
/* Scans a string 's' of flags to determine their numerical value and
* returns the number of characters parsed using 'bit_to_string' to
* lookup flag names. Scanning continues until the character 'end' is
* reached.
*
* In the event of a failure, a negative error code will be returned. In
* addition, if 'res_string' is non-NULL then a descriptive string will
* be returned incorporating the identifying string 'field_name'. This
* error string must be freed by the caller.
*
* Upon success, the flag values will be stored in 'res_flags' and
* optionally 'res_mask', if it is non-NULL (if it is NULL then any masks
* present in the original string will be considered an error). The
* caller may restrict the acceptable set of values through the mask
* 'allowed'. */
int
parse_flags(const char *s, const char *(*bit_to_string)(uint32_t),
char end, const char *field_name, char **res_string,
uint32_t *res_flags, uint32_t allowed, uint32_t *res_mask)
{
uint32_t result = 0;
int n;
/* Parse masked flags in numeric format? */
if (res_mask && ovs_scan(s, "%"SCNi32"/%"SCNi32"%n",
res_flags, res_mask, &n) && n > 0) {
if (*res_flags & ~allowed || *res_mask & ~allowed) {
goto unknown;
}
return n;
}
n = 0;
if (res_mask && (*s == '+' || *s == '-')) {
uint32_t flags = 0, mask = 0;
/* Parse masked flags. */
while (s[0] != end) {
bool set;
uint32_t bit;
size_t len;
if (s[0] == '+') {
set = true;
} else if (s[0] == '-') {
set = false;
} else {
if (res_string) {
*res_string = xasprintf("%s: %s must be preceded by '+' "
"(for SET) or '-' (NOT SET)", s,
field_name);
}
return -EINVAL;
}
s++;
n++;
for (bit = 1; bit; bit <<= 1) {
const char *fname = bit_to_string(bit);
if (!fname) {
continue;
}
len = strlen(fname);
if (strncmp(s, fname, len) ||
(s[len] != '+' && s[len] != '-' && s[len] != end)) {
continue;
}
if (mask & bit) {
/* bit already set. */
if (res_string) {
*res_string = xasprintf("%s: Each %s flag can be "
"specified only once", s,
field_name);
}
return -EINVAL;
}