}
static enum ofperr
-nx_pull_match__(struct ofpbuf *b, unsigned int match_len, bool strict,
- uint16_t priority, struct cls_rule *rule,
- ovs_be64 *cookie, ovs_be64 *cookie_mask)
+nx_pull_raw(const uint8_t *p, unsigned int match_len, bool strict,
+ struct match *match, ovs_be64 *cookie, ovs_be64 *cookie_mask)
{
uint32_t header;
- uint8_t *p;
assert((cookie != NULL) == (cookie_mask != NULL));
- cls_rule_init_catchall(rule, priority);
+ match_init_catchall(match);
if (cookie) {
*cookie = *cookie_mask = htonll(0);
}
return 0;
}
- p = ofpbuf_try_pull(b, ROUND_UP(match_len, 8));
- if (!p) {
- VLOG_DBG_RL(&rl, "nx_match length %u, rounded up to a "
- "multiple of 8, is longer than space in message (max "
- "length %zu)", match_len, b->size);
- return OFPERR_OFPBMC_BAD_LEN;
- }
-
for (;
(header = nx_entry_ok(p, match_len)) != 0;
p += 4 + NXM_LENGTH(header), match_len -= 4 + NXM_LENGTH(header)) {
} else {
continue;
}
- } else if (!mf_are_prereqs_ok(mf, &rule->flow)) {
+ } else if (!mf_are_prereqs_ok(mf, &match->flow)) {
error = OFPERR_OFPBMC_BAD_PREREQ;
- } else if (!mf_is_all_wild(mf, &rule->wc)) {
+ } else if (!mf_is_all_wild(mf, &match->wc)) {
error = OFPERR_OFPBMC_DUP_FIELD;
} else if (header != OXM_OF_IN_PORT) {
unsigned int width = mf->n_bytes;
error = OFPERR_OFPBMC_BAD_VALUE;
} else if (!NXM_HASMASK(header)) {
error = 0;
- mf_set_value(mf, &value, rule);
+ mf_set_value(mf, &value, match);
} else {
union mf_value mask;
error = OFPERR_OFPBMC_BAD_MASK;
} else {
error = 0;
- mf_set(mf, &value, &mask, rule);
+ mf_set(mf, &value, &mask, match);
}
}
} else {
memcpy(&port_of11, p + 4, sizeof port_of11);
error = ofputil_port_from_ofp11(port_of11, &port);
if (!error) {
- cls_rule_set_in_port(rule, port);
+ match_set_in_port(match, port);
}
}
return match_len ? OFPERR_OFPBMC_BAD_LEN : 0;
}
+static enum ofperr
+nx_pull_match__(struct ofpbuf *b, unsigned int match_len, bool strict,
+ struct match *match,
+ ovs_be64 *cookie, ovs_be64 *cookie_mask)
+{
+ uint8_t *p = NULL;
+
+ if (match_len) {
+ p = ofpbuf_try_pull(b, ROUND_UP(match_len, 8));
+ if (!p) {
+ VLOG_DBG_RL(&rl, "nx_match length %u, rounded up to a "
+ "multiple of 8, is longer than space in message (max "
+ "length %zu)", match_len, b->size);
+ return OFPERR_OFPBMC_BAD_LEN;
+ }
+ }
+
+ return nx_pull_raw(p, match_len, strict, match, cookie, cookie_mask);
+}
+
/* Parses the nx_match formatted match description in 'b' with length
- * 'match_len'. The results are stored in 'rule', which is initialized with
- * 'priority'. If 'cookie' and 'cookie_mask' contain valid pointers, then the
- * cookie and mask will be stored in them if a "NXM_NX_COOKIE*" match is
- * defined. Otherwise, 0 is stored in both.
+ * 'match_len'. Stores the results in 'match'. If 'cookie' and 'cookie_mask'
+ * are valid pointers, then stores the cookie and mask in them if 'b' contains
+ * a "NXM_NX_COOKIE*" match. Otherwise, stores 0 in both.
*
- * Fails with an error when encountering unknown NXM headers.
+ * Fails with an error upon encountering an unknown NXM header.
*
* Returns 0 if successful, otherwise an OpenFlow error code. */
enum ofperr
-nx_pull_match(struct ofpbuf *b, unsigned int match_len,
- uint16_t priority, struct cls_rule *rule,
+nx_pull_match(struct ofpbuf *b, unsigned int match_len, struct match *match,
ovs_be64 *cookie, ovs_be64 *cookie_mask)
{
- return nx_pull_match__(b, match_len, true, priority, rule, cookie,
- cookie_mask);
+ return nx_pull_match__(b, match_len, true, match, cookie, cookie_mask);
}
-/* Behaves the same as nx_pull_match() with one exception. Skips over unknown
- * NXM headers instead of failing with an error when they are encountered. */
+/* Behaves the same as nx_pull_match(), but skips over unknown NXM headers,
+ * instead of failing with an error. */
enum ofperr
nx_pull_match_loose(struct ofpbuf *b, unsigned int match_len,
- uint16_t priority, struct cls_rule *rule,
+ struct match *match,
ovs_be64 *cookie, ovs_be64 *cookie_mask)
{
- return nx_pull_match__(b, match_len, false, priority, rule, cookie,
- cookie_mask);
+ return nx_pull_match__(b, match_len, false, match, cookie, cookie_mask);
+}
+
+static enum ofperr
+oxm_pull_match__(struct ofpbuf *b, bool strict, struct match *match)
+{
+ struct ofp11_match_header *omh = b->data;
+ uint8_t *p;
+ uint16_t match_len;
+
+ if (b->size < sizeof *omh) {
+ return OFPERR_OFPBMC_BAD_LEN;
+ }
+
+ match_len = ntohs(omh->length);
+ if (match_len < sizeof *omh) {
+ return OFPERR_OFPBMC_BAD_LEN;
+ }
+
+ if (omh->type != htons(OFPMT_OXM)) {
+ return OFPERR_OFPBMC_BAD_TYPE;
+ }
+
+ p = ofpbuf_try_pull(b, ROUND_UP(match_len, 8));
+ if (!p) {
+ VLOG_DBG_RL(&rl, "oxm length %u, rounded up to a "
+ "multiple of 8, is longer than space in message (max "
+ "length %zu)", match_len, b->size);
+ return OFPERR_OFPBMC_BAD_LEN;
+ }
+
+ return nx_pull_raw(p + sizeof *omh, match_len - sizeof *omh,
+ strict, match, NULL, NULL);
+}
+
+/* Parses the oxm formatted match description preceeded by a struct ofp11_match
+ * in 'b' with length 'match_len'. Stores the result in 'match'.
+ *
+ * Fails with an error when encountering unknown OXM headers.
+ *
+ * Returns 0 if successful, otherwise an OpenFlow error code. */
+enum ofperr
+oxm_pull_match(struct ofpbuf *b, struct match *match)
+{
+ return oxm_pull_match__(b, true, match);
+}
+
+/* Behaves the same as oxm_pull_match() with one exception. Skips over unknown
+ * PXM headers instead of failing with an error when they are encountered. */
+enum ofperr
+oxm_pull_match_loose(struct ofpbuf *b, struct match *match)
+{
+ return oxm_pull_match__(b, false, match);
}
\f
/* nx_put_match() and helpers.
}
static void
-nxm_put_frag(struct ofpbuf *b, const struct cls_rule *cr)
+nxm_put_frag(struct ofpbuf *b, const struct match *match)
{
- uint8_t nw_frag = cr->flow.nw_frag;
- uint8_t nw_frag_mask = cr->wc.nw_frag_mask;
+ uint8_t nw_frag = match->flow.nw_frag;
+ uint8_t nw_frag_mask = match->wc.masks.nw_frag;
switch (nw_frag_mask) {
case 0:
}
static void
-nxm_put_ip(struct ofpbuf *b, const struct cls_rule *cr,
+nxm_put_ip(struct ofpbuf *b, const struct match *match,
uint8_t icmp_proto, uint32_t icmp_type, uint32_t icmp_code,
bool oxm)
{
- const flow_wildcards_t wc = cr->wc.wildcards;
- const struct flow *flow = &cr->flow;
+ const struct flow *flow = &match->flow;
- nxm_put_frag(b, cr);
+ nxm_put_frag(b, match);
- if (!(wc & FWW_NW_DSCP)) {
+ if (match->wc.masks.nw_tos & IP_DSCP_MASK) {
nxm_put_8(b, oxm ? OXM_OF_IP_DSCP : NXM_OF_IP_TOS,
flow->nw_tos & IP_DSCP_MASK);
}
- if (!(wc & FWW_NW_ECN)) {
+ if (match->wc.masks.nw_tos & IP_ECN_MASK) {
nxm_put_8(b, oxm ? OXM_OF_IP_ECN : NXM_NX_IP_ECN,
flow->nw_tos & IP_ECN_MASK);
}
- if (!oxm && !(wc & FWW_NW_TTL)) {
+ if (!oxm && match->wc.masks.nw_ttl) {
nxm_put_8(b, NXM_NX_IP_TTL, flow->nw_ttl);
}
- if (!(wc & FWW_NW_PROTO)) {
+ if (match->wc.masks.nw_proto) {
nxm_put_8(b, oxm ? OXM_OF_IP_PROTO : NXM_OF_IP_PROTO, flow->nw_proto);
if (flow->nw_proto == IPPROTO_TCP) {
nxm_put_16m(b, oxm ? OXM_OF_TCP_SRC : NXM_OF_TCP_SRC,
- flow->tp_src, cr->wc.tp_src_mask);
+ flow->tp_src, match->wc.masks.tp_src);
nxm_put_16m(b, oxm ? OXM_OF_TCP_DST : NXM_OF_TCP_DST,
- flow->tp_dst, cr->wc.tp_dst_mask);
+ flow->tp_dst, match->wc.masks.tp_dst);
} else if (flow->nw_proto == IPPROTO_UDP) {
nxm_put_16m(b, oxm ? OXM_OF_UDP_SRC : NXM_OF_UDP_SRC,
- flow->tp_src, cr->wc.tp_src_mask);
+ flow->tp_src, match->wc.masks.tp_src);
nxm_put_16m(b, oxm ? OXM_OF_UDP_DST : NXM_OF_UDP_DST,
- flow->tp_dst, cr->wc.tp_dst_mask);
+ flow->tp_dst, match->wc.masks.tp_dst);
} else if (flow->nw_proto == icmp_proto) {
- if (cr->wc.tp_src_mask) {
+ if (match->wc.masks.tp_src) {
nxm_put_8(b, icmp_type, ntohs(flow->tp_src));
}
- if (cr->wc.tp_dst_mask) {
+ if (match->wc.masks.tp_dst) {
nxm_put_8(b, icmp_code, ntohs(flow->tp_dst));
}
}
}
}
-/* Appends to 'b' the nx_match format that expresses 'cr' (except for
- * 'cr->priority', because priority is not part of nx_match), plus enough
- * zero bytes to pad the nx_match out to a multiple of 8. For Flow Mod
- * and Flow Stats Requests messages, a 'cookie' and 'cookie_mask' may be
- * supplied. Otherwise, 'cookie_mask' should be zero.
+/* Appends to 'b' the nx_match format that expresses 'match'. For Flow Mod and
+ * Flow Stats Requests messages, a 'cookie' and 'cookie_mask' may be supplied.
+ * Otherwise, 'cookie_mask' should be zero.
*
* This function can cause 'b''s data to be reallocated.
*
* Returns the number of bytes appended to 'b', excluding padding.
*
- * If 'cr' is a catch-all rule that matches every packet, then this function
+ * If 'match' is a catch-all rule that matches every packet, then this function
* appends nothing to 'b' and returns 0. */
-int
-nx_put_match(struct ofpbuf *b, bool oxm, const struct cls_rule *cr,
- ovs_be64 cookie, ovs_be64 cookie_mask)
+static int
+nx_put_raw(struct ofpbuf *b, bool oxm, const struct match *match,
+ ovs_be64 cookie, ovs_be64 cookie_mask)
{
- const flow_wildcards_t wc = cr->wc.wildcards;
- const struct flow *flow = &cr->flow;
+ const struct flow *flow = &match->flow;
const size_t start_len = b->size;
int match_len;
int i;
- BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14);
+ BUILD_ASSERT_DECL(FLOW_WC_SEQ == 17);
/* Metadata. */
- if (!(wc & FWW_IN_PORT)) {
+ if (match->wc.masks.in_port) {
uint16_t in_port = flow->in_port;
if (oxm) {
nxm_put_32(b, OXM_OF_IN_PORT, ofputil_port_to_ofp11(in_port));
/* Ethernet. */
nxm_put_eth_masked(b, oxm ? OXM_OF_ETH_SRC : NXM_OF_ETH_SRC,
- flow->dl_src, cr->wc.dl_src_mask);
+ flow->dl_src, match->wc.masks.dl_src);
nxm_put_eth_masked(b, oxm ? OXM_OF_ETH_DST : NXM_OF_ETH_DST,
- flow->dl_dst, cr->wc.dl_dst_mask);
- if (!(wc & FWW_DL_TYPE)) {
- nxm_put_16(b, oxm ? OXM_OF_ETH_TYPE : NXM_OF_ETH_TYPE,
- ofputil_dl_type_to_openflow(flow->dl_type));
- }
+ flow->dl_dst, match->wc.masks.dl_dst);
+ nxm_put_16m(b, oxm ? OXM_OF_ETH_TYPE : NXM_OF_ETH_TYPE,
+ ofputil_dl_type_to_openflow(flow->dl_type),
+ match->wc.masks.dl_type);
+
+ /* 802.1Q. */
+ if (oxm) {
+ ovs_be16 VID_CFI_MASK = htons(VLAN_VID_MASK | VLAN_CFI);
+ ovs_be16 vid = flow->vlan_tci & VID_CFI_MASK;
+ ovs_be16 mask = match->wc.masks.vlan_tci & VID_CFI_MASK;
+
+ if (mask == htons(VLAN_VID_MASK | VLAN_CFI)) {
+ nxm_put_16(b, OXM_OF_VLAN_VID, vid);
+ } else if (mask) {
+ nxm_put_16m(b, OXM_OF_VLAN_VID, vid, mask);
+ }
- /* 802.1Q.
- *
- * XXX missing OXM support */
- nxm_put_16m(b, NXM_OF_VLAN_TCI, flow->vlan_tci, cr->wc.vlan_tci_mask);
+ if (vid && vlan_tci_to_pcp(match->wc.masks.vlan_tci)) {
+ nxm_put_8(b, OXM_OF_VLAN_PCP, vlan_tci_to_pcp(flow->vlan_tci));
+ }
+
+ } else {
+ nxm_put_16m(b, NXM_OF_VLAN_TCI, flow->vlan_tci,
+ match->wc.masks.vlan_tci);
+ }
/* L3. */
- if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IP)) {
+ if (flow->dl_type == htons(ETH_TYPE_IP)) {
/* IP. */
nxm_put_32m(b, oxm ? OXM_OF_IPV4_SRC : NXM_OF_IP_SRC,
- flow->nw_src, cr->wc.nw_src_mask);
+ flow->nw_src, match->wc.masks.nw_src);
nxm_put_32m(b, oxm ? OXM_OF_IPV4_DST : NXM_OF_IP_DST,
- flow->nw_dst, cr->wc.nw_dst_mask);
- nxm_put_ip(b, cr, IPPROTO_ICMP,
+ flow->nw_dst, match->wc.masks.nw_dst);
+ nxm_put_ip(b, match, IPPROTO_ICMP,
oxm ? OXM_OF_ICMPV4_TYPE : NXM_OF_ICMP_TYPE,
oxm ? OXM_OF_ICMPV4_CODE : NXM_OF_ICMP_CODE, oxm);
- } else if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_IPV6)) {
+ } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
/* IPv6. */
nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_SRC : NXM_NX_IPV6_SRC,
- &flow->ipv6_src, &cr->wc.ipv6_src_mask);
+ &flow->ipv6_src, &match->wc.masks.ipv6_src);
nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_DST : NXM_NX_IPV6_DST,
- &flow->ipv6_dst, &cr->wc.ipv6_dst_mask);
- nxm_put_ip(b, cr, IPPROTO_ICMPV6,
+ &flow->ipv6_dst, &match->wc.masks.ipv6_dst);
+ nxm_put_ip(b, match, IPPROTO_ICMPV6,
oxm ? OXM_OF_ICMPV6_TYPE : NXM_NX_ICMPV6_TYPE,
oxm ? OXM_OF_ICMPV6_CODE : NXM_NX_ICMPV6_CODE, oxm);
nxm_put_32m(b, oxm ? OXM_OF_IPV6_FLABEL : NXM_NX_IPV6_LABEL,
- flow->ipv6_label, cr->wc.ipv6_label_mask);
+ flow->ipv6_label, match->wc.masks.ipv6_label);
if (flow->nw_proto == IPPROTO_ICMPV6
&& (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT) ||
flow->tp_src == htons(ND_NEIGHBOR_ADVERT))) {
nxm_put_ipv6(b, oxm ? OXM_OF_IPV6_ND_TARGET : NXM_NX_ND_TARGET,
- &flow->nd_target, &cr->wc.nd_target_mask);
+ &flow->nd_target, &match->wc.masks.nd_target);
if (flow->tp_src == htons(ND_NEIGHBOR_SOLICIT)) {
nxm_put_eth_masked(b, oxm ? OXM_OF_IPV6_ND_SLL : NXM_NX_ND_SLL,
- flow->arp_sha, cr->wc.arp_sha_mask);
+ flow->arp_sha, match->wc.masks.arp_sha);
}
if (flow->tp_src == htons(ND_NEIGHBOR_ADVERT)) {
nxm_put_eth_masked(b, oxm ? OXM_OF_IPV6_ND_TLL : NXM_NX_ND_TLL,
- flow->arp_tha, cr->wc.arp_tha_mask);
+ flow->arp_tha, match->wc.masks.arp_tha);
}
}
- } else if (!(wc & FWW_DL_TYPE) && flow->dl_type == htons(ETH_TYPE_ARP)) {
+ } else if (flow->dl_type == htons(ETH_TYPE_ARP)) {
/* ARP. */
- if (!(wc & FWW_NW_PROTO)) {
+ if (match->wc.masks.nw_proto) {
nxm_put_16(b, oxm ? OXM_OF_ARP_OP : NXM_OF_ARP_OP,
htons(flow->nw_proto));
}
nxm_put_32m(b, oxm ? OXM_OF_ARP_SPA : NXM_OF_ARP_SPA,
- flow->nw_src, cr->wc.nw_src_mask);
+ flow->nw_src, match->wc.masks.nw_src);
nxm_put_32m(b, oxm ? OXM_OF_ARP_TPA : NXM_OF_ARP_TPA,
- flow->nw_dst, cr->wc.nw_dst_mask);
+ flow->nw_dst, match->wc.masks.nw_dst);
nxm_put_eth_masked(b, oxm ? OXM_OF_ARP_SHA : NXM_NX_ARP_SHA,
- flow->arp_sha, cr->wc.arp_sha_mask);
+ flow->arp_sha, match->wc.masks.arp_sha);
nxm_put_eth_masked(b, oxm ? OXM_OF_ARP_THA : NXM_NX_ARP_THA,
- flow->arp_tha, cr->wc.arp_tha_mask);
+ flow->arp_tha, match->wc.masks.arp_tha);
}
/* Tunnel ID. */
- nxm_put_64m(b, NXM_NX_TUN_ID, flow->tun_id, cr->wc.tun_id_mask);
+ nxm_put_64m(b, NXM_NX_TUN_ID, flow->tun_id, match->wc.masks.tun_id);
/* Registers. */
for (i = 0; i < FLOW_N_REGS; i++) {
nxm_put_32m(b, NXM_NX_REG(i),
- htonl(flow->regs[i]), htonl(cr->wc.reg_masks[i]));
+ htonl(flow->regs[i]), htonl(match->wc.masks.regs[i]));
}
/* OpenFlow 1.1+ Metadata. */
- nxm_put_64m(b, OXM_OF_METADATA, flow->metadata, cr->wc.metadata_mask);
+ nxm_put_64m(b, OXM_OF_METADATA, flow->metadata, match->wc.masks.metadata);
/* Cookie. */
nxm_put_64m(b, NXM_NX_COOKIE, cookie, cookie_mask);
match_len = b->size - start_len;
+ return match_len;
+}
+
+/* Appends to 'b' the nx_match format that expresses 'match', plus enough zero
+ * bytes to pad the nx_match out to a multiple of 8. For Flow Mod and Flow
+ * Stats Requests messages, a 'cookie' and 'cookie_mask' may be supplied.
+ * Otherwise, 'cookie_mask' should be zero.
+ *
+ * This function can cause 'b''s data to be reallocated.
+ *
+ * Returns the number of bytes appended to 'b', excluding padding. The return
+ * value can be zero if it appended nothing at all to 'b' (which happens if
+ * 'cr' is a catch-all rule that matches every packet). */
+int
+nx_put_match(struct ofpbuf *b, const struct match *match,
+ ovs_be64 cookie, ovs_be64 cookie_mask)
+{
+ int match_len = nx_put_raw(b, false, match, cookie, cookie_mask);
+
ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
return match_len;
}
+
+
+/* Appends to 'b' an struct ofp11_match_header followed by the oxm format that
+ * expresses 'cr', plus enough zero bytes to pad the data appended out to a
+ * multiple of 8.
+ *
+ * This function can cause 'b''s data to be reallocated.
+ *
+ * Returns the number of bytes appended to 'b', excluding the padding. Never
+ * returns zero. */
+int
+oxm_put_match(struct ofpbuf *b, const struct match *match)
+{
+ int match_len;
+ struct ofp11_match_header *omh;
+ size_t start_len = b->size;
+ ovs_be64 cookie = htonll(0), cookie_mask = htonll(0);
+
+ ofpbuf_put_uninit(b, sizeof *omh);
+ match_len = nx_put_raw(b, true, match, cookie, cookie_mask) + sizeof *omh;
+ ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
+
+ omh = (struct ofp11_match_header *)((char *)b->data + start_len);
+ omh->type = htons(OFPMT_OXM);
+ omh->length = htons(match_len);
+
+ return match_len;
+}
\f
/* nx_match_to_string() and helpers. */
return ds_steal_cstr(&s);
}
+char *
+oxm_match_to_string(const uint8_t *p, unsigned int match_len)
+{
+ const struct ofp11_match_header *omh = (struct ofp11_match_header *)p;
+ uint16_t match_len_;
+ struct ds s;
+
+ ds_init(&s);
+
+ if (match_len < sizeof *omh) {
+ ds_put_format(&s, "<match too short: %u>", match_len);
+ goto err;
+ }
+
+ if (omh->type != htons(OFPMT_OXM)) {
+ ds_put_format(&s, "<bad match type field: %u>", ntohs(omh->type));
+ goto err;
+ }
+
+ match_len_ = ntohs(omh->length);
+ if (match_len_ < sizeof *omh) {
+ ds_put_format(&s, "<match length field too short: %u>", match_len_);
+ goto err;
+ }
+
+ if (match_len_ != match_len) {
+ ds_put_format(&s, "<match length field incorrect: %u != %u>",
+ match_len_, match_len);
+ goto err;
+ }
+
+ return nx_match_to_string(p + sizeof *omh, match_len - sizeof *omh);
+
+err:
+ return ds_steal_cstr(&s);
+}
+
static void
format_nxm_field_name(struct ds *s, uint32_t header)
{
\f
/* nx_match_from_string(). */
-int
-nx_match_from_string(const char *s, struct ofpbuf *b)
+static int
+nx_match_from_string_raw(const char *s, struct ofpbuf *b)
{
const char *full_s = s;
const size_t start_len = b->size;
- int match_len;
if (!strcmp(s, "<any>")) {
/* Ensure that 'b->data' isn't actually null. */
s++;
}
- match_len = b->size - start_len;
+ return b->size - start_len;
+}
+
+int
+nx_match_from_string(const char *s, struct ofpbuf *b)
+{
+ int match_len = nx_match_from_string_raw(s, b);
ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
return match_len;
}
+
+int
+oxm_match_from_string(const char *s, struct ofpbuf *b)
+{
+ int match_len;
+ struct ofp11_match_header *omh;
+ size_t start_len = b->size;
+
+ ofpbuf_put_uninit(b, sizeof *omh);
+ match_len = nx_match_from_string_raw(s, b) + sizeof *omh;
+ ofpbuf_put_zeros(b, ROUND_UP(match_len, 8) - match_len);
+
+ omh = (struct ofp11_match_header *)((char *)b->data + start_len);
+ omh->type = htons(OFPMT_OXM);
+ omh->length = htons(match_len);
+
+ return match_len;
+}
\f
void
nxm_parse_reg_move(struct ofpact_reg_move *move, const char *s)