/*
- * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
+ * 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.
#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);
-static struct arp_eth_header *
-pull_arp(struct ofpbuf *packet)
-{
- return ofpbuf_try_pull(packet, ARP_ETH_HEADER_LEN);
-}
-
-static struct ip_header *
-pull_ip(struct ofpbuf *packet)
-{
- if (packet->size >= IP_HEADER_LEN) {
- struct ip_header *ip = packet->data;
- int ip_len = IP_IHL(ip->ip_ihl_ver) * 4;
- if (ip_len >= IP_HEADER_LEN && packet->size >= ip_len) {
- return ofpbuf_pull(packet, ip_len);
- }
+/* 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 warnigns on ALWAYS_INLINE, so these are
+ * defined as macros. */
+
+#if (FLOW_WC_SEQ != 26)
+#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); \
+ } \
}
- return NULL;
-}
-static struct tcp_header *
-pull_tcp(struct ofpbuf *packet)
-{
- if (packet->size >= TCP_HEADER_LEN) {
- struct tcp_header *tcp = packet->data;
- int tcp_len = TCP_OFFSET(tcp->tcp_ctl) * 4;
- if (tcp_len >= TCP_HEADER_LEN && packet->size >= tcp_len) {
- return ofpbuf_pull(packet, tcp_len);
- }
+#define miniflow_push_be32_check(MF, FIELD, VALUE) \
+ { if (OVS_LIKELY(VALUE)) { \
+ miniflow_push_be32_(MF, offsetof(struct flow, FIELD), VALUE); \
+ } \
}
- return NULL;
-}
-static struct udp_header *
-pull_udp(struct ofpbuf *packet)
-{
- return ofpbuf_try_pull(packet, UDP_HEADER_LEN);
-}
+#define miniflow_push_uint16(MF, FIELD, VALUE) \
+ miniflow_push_uint16_(MF, offsetof(struct flow, FIELD), VALUE)
-static struct sctp_header *
-pull_sctp(struct ofpbuf *packet)
-{
- return ofpbuf_try_pull(packet, SCTP_HEADER_LEN);
-}
+#define miniflow_push_be16(MF, FIELD, VALUE) \
+ miniflow_push_be16_(MF, offsetof(struct flow, FIELD), VALUE)
-static struct icmp_header *
-pull_icmp(struct ofpbuf *packet)
-{
- return ofpbuf_try_pull(packet, ICMP_HEADER_LEN);
-}
+#define miniflow_push_words(MF, FIELD, VALUEP, N_WORDS) \
+ miniflow_push_words_(MF, offsetof(struct flow, FIELD), VALUEP, N_WORDS)
-static struct icmp6_hdr *
-pull_icmpv6(struct ofpbuf *packet)
+/* Pulls the MPLS headers at '*datap' and returns the count of them. */
+static inline int
+parse_mpls(void **datap, size_t *sizep)
{
- return ofpbuf_try_pull(packet, sizeof(struct icmp6_hdr));
-}
+ const struct mpls_hdr *mh;
+ int count = 0;
-static void
-parse_mpls(struct ofpbuf *b, struct flow *flow)
-{
- struct mpls_hdr *mh;
- bool top = true;
-
- while ((mh = ofpbuf_try_pull(b, sizeof *mh))) {
- if (top) {
- top = false;
- flow->mpls_lse = mh->mpls_lse;
- }
- if (mh->mpls_lse & htonl(MPLS_BOS_MASK)) {
+ while ((mh = data_try_pull(datap, sizep, sizeof *mh))) {
+ count++;
+ if (mh->mpls_lse.lo & htons(1 << MPLS_BOS_SHIFT)) {
break;
}
}
+ return MAX(count, FLOW_MAX_MPLS_LABELS);
}
-static void
-parse_vlan(struct ofpbuf *b, struct flow *flow)
+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;
};
- if (b->size >= sizeof(struct qtag_prefix) + sizeof(ovs_be16)) {
- struct qtag_prefix *qp = ofpbuf_pull(b, sizeof *qp);
- flow->vlan_tci = qp->tci | htons(VLAN_CFI);
+ 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 ovs_be16
-parse_ethertype(struct ofpbuf *b)
+static inline ovs_be16
+parse_ethertype(void **datap, size_t *sizep)
{
- struct llc_snap_header *llc;
+ const struct llc_snap_header *llc;
ovs_be16 proto;
- proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto);
- if (ntohs(proto) >= ETH_TYPE_MIN) {
+ proto = *(ovs_be16 *) data_pull(datap, sizep, sizeof proto);
+ if (OVS_LIKELY(ntohs(proto) >= ETH_TYPE_MIN)) {
return proto;
}
- if (b->size < sizeof *llc) {
+ if (OVS_UNLIKELY(*sizep < sizeof *llc)) {
return htons(FLOW_DL_TYPE_NONE);
}
- llc = b->data;
- if (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)) {
+ 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);
}
- ofpbuf_pull(b, sizeof *llc);
+ data_pull(datap, sizep, sizeof *llc);
- if (ntohs(llc->snap.snap_type) >= ETH_TYPE_MIN) {
+ if (OVS_LIKELY(ntohs(llc->snap.snap_type) >= ETH_TYPE_MIN)) {
return llc->snap.snap_type;
}
return htons(FLOW_DL_TYPE_NONE);
}
-static int
-parse_ipv6(struct ofpbuf *packet, struct flow *flow)
-{
- const struct ovs_16aligned_ip6_hdr *nh;
- ovs_be32 tc_flow;
- int nexthdr;
-
- nh = ofpbuf_try_pull(packet, sizeof *nh);
- if (!nh) {
- return EINVAL;
- }
-
- nexthdr = nh->ip6_nxt;
-
- memcpy(&flow->ipv6_src, &nh->ip6_src, sizeof flow->ipv6_src);
- memcpy(&flow->ipv6_dst, &nh->ip6_dst, sizeof flow->ipv6_dst);
-
- tc_flow = get_16aligned_be32(&nh->ip6_flow);
- flow->nw_tos = ntohl(tc_flow) >> 20;
- flow->ipv6_label = tc_flow & htonl(IPV6_LABEL_MASK);
- flow->nw_ttl = nh->ip6_hlim;
- flow->nw_proto = IPPROTO_NONE;
-
- while (1) {
- if ((nexthdr != IPPROTO_HOPOPTS)
- && (nexthdr != IPPROTO_ROUTING)
- && (nexthdr != IPPROTO_DSTOPTS)
- && (nexthdr != IPPROTO_AH)
- && (nexthdr != 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 (packet->size < 8) {
- return EINVAL;
- }
-
- if ((nexthdr == IPPROTO_HOPOPTS)
- || (nexthdr == IPPROTO_ROUTING)
- || (nexthdr == 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 = packet->data;
- nexthdr = ext_hdr->ip6e_nxt;
- if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 1) * 8)) {
- return EINVAL;
- }
- } else if (nexthdr == 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 = packet->data;
- nexthdr = ext_hdr->ip6e_nxt;
- if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 2) * 4)) {
- return EINVAL;
- }
- } else if (nexthdr == IPPROTO_FRAGMENT) {
- const struct ovs_16aligned_ip6_frag *frag_hdr = packet->data;
-
- nexthdr = frag_hdr->ip6f_nxt;
- if (!ofpbuf_try_pull(packet, sizeof *frag_hdr)) {
- return EINVAL;
- }
-
- /* We only process the first fragment. */
- if (frag_hdr->ip6f_offlg != htons(0)) {
- flow->nw_frag = FLOW_NW_FRAG_ANY;
- if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) != htons(0)) {
- flow->nw_frag |= FLOW_NW_FRAG_LATER;
- nexthdr = IPPROTO_FRAGMENT;
- break;
- }
- }
- }
- }
-
- flow->nw_proto = nexthdr;
- return 0;
-}
-
-static void
-parse_tcp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
-{
- const struct tcp_header *tcp = pull_tcp(b);
- if (tcp) {
- flow->tp_src = tcp->tcp_src;
- flow->tp_dst = tcp->tcp_dst;
- flow->tcp_flags = tcp->tcp_ctl & htons(0x0fff);
- packet->l7 = b->data;
- }
-}
-
-static void
-parse_udp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
+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])
{
- const struct udp_header *udp = pull_udp(b);
- if (udp) {
- flow->tp_src = udp->udp_src;
- flow->tp_dst = udp->udp_dst;
- packet->l7 = b->data;
- }
-}
-
-static void
-parse_sctp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow)
-{
- const struct sctp_header *sctp = pull_sctp(b);
- if (sctp) {
- flow->tp_src = sctp->sctp_src;
- flow->tp_dst = sctp->sctp_dst;
- packet->l7 = b->data;
- }
-}
-
-static bool
-parse_icmpv6(struct ofpbuf *b, struct flow *flow)
-{
- const struct icmp6_hdr *icmp = pull_icmpv6(b);
-
- if (!icmp) {
- return false;
- }
-
- /* The ICMPv6 type and code fields use the 16-bit transport port
- * fields, so we need to store them in 16-bit network byte order. */
- flow->tp_src = htons(icmp->icmp6_type);
- flow->tp_dst = htons(icmp->icmp6_code);
-
if (icmp->icmp6_code == 0 &&
(icmp->icmp6_type == ND_NEIGHBOR_SOLICIT ||
icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) {
- const struct in6_addr *nd_target;
- nd_target = ofpbuf_try_pull(b, sizeof *nd_target);
- if (!nd_target) {
+ *nd_target = data_try_pull(datap, sizep, sizeof *nd_target);
+ if (OVS_UNLIKELY(!*nd_target)) {
return false;
}
- flow->nd_target = *nd_target;
- while (b->size >= 8) {
+ 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 = b->data;
+ const struct nd_opt_hdr *nd_opt = *datap;
int opt_len = nd_opt->nd_opt_len * 8;
- if (!opt_len || opt_len > b->size) {
+ if (!opt_len || opt_len > *sizep) {
goto invalid;
}
* layer option is specified twice. */
if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
&& opt_len == 8) {
- if (eth_addr_is_zero(flow->arp_sha)) {
- memcpy(flow->arp_sha, nd_opt + 1, ETH_ADDR_LEN);
+ 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 (eth_addr_is_zero(flow->arp_tha)) {
- memcpy(flow->arp_tha, nd_opt + 1, ETH_ADDR_LEN);
+ if (OVS_LIKELY(eth_addr_is_zero(arp_buf[1]))) {
+ memcpy(arp_buf[1], nd_opt + 1, ETH_ADDR_LEN);
} else {
goto invalid;
}
}
- if (!ofpbuf_try_pull(b, opt_len)) {
+ if (OVS_UNLIKELY(!data_try_pull(datap, sizep, opt_len))) {
goto invalid;
}
}
return true;
invalid:
- memset(&flow->nd_target, 0, sizeof(flow->nd_target));
- memset(flow->arp_sha, 0, sizeof(flow->arp_sha));
- memset(flow->arp_tha, 0, sizeof(flow->arp_tha));
-
return false;
-
}
-/* Initializes 'flow' members from 'packet', 'skb_priority', 'tnl', and
- * 'in_port'.
- *
- * Initializes 'packet' header pointers as follows:
+/* Initializes 'flow' members from 'packet' and 'md'
*
- * - packet->l2 to the start of the Ethernet header.
+ * Initializes 'packet' header l2 pointer to the start of the Ethernet
+ * header, and the layer offsets as follows:
*
- * - packet->l2_5 to the start of the MPLS shim header.
+ * - packet->l2_5_ofs to the start of the MPLS shim header, or UINT16_MAX
+ * when there is no MPLS shim header.
*
- * - packet->l3 to just past the Ethernet header, or just past the
+ * - 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.
+ * Ethernet frame. UINT16_MAX if the frame is too short to contain an
+ * Ethernet header.
*
- * - packet->l4 to just past the IPv4 header, if one is present and has a
- * correct length, and otherwise NULL.
- *
- * - packet->l7 to just past the TCP/UDP/SCTP/ICMP header, if one is
- * present and has a correct length, and otherwise NULL.
+ * - 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, uint32_t skb_priority, uint32_t pkt_mark,
- const struct flow_tnl *tnl, const union flow_in_port *in_port,
+flow_extract(struct ofpbuf *packet, const struct pkt_metadata *md,
struct flow *flow)
{
- struct ofpbuf b = *packet;
- struct eth_header *eth;
+ uint32_t buf[FLOW_U32S];
+ struct miniflow mf;
COVERAGE_INC(flow_extract);
- memset(flow, 0, sizeof *flow);
+ miniflow_initialize(&mf, buf);
+ miniflow_extract(packet, md, &mf);
+ miniflow_expand(&mf, flow);
+}
- if (tnl) {
- ovs_assert(tnl != &flow->tunnel);
- flow->tunnel = *tnl;
- }
- if (in_port) {
- flow->in_port = *in_port;
+/* Caller is responsible for initializing 'dst->values' 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);
+ char *l2;
+ struct mf_ctx mf = { 0, dst->values, dst->values + FLOW_U32S };
+ 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));
}
- flow->skb_priority = skb_priority;
- flow->pkt_mark = pkt_mark;
- packet->l2 = b.data;
- packet->l2_5 = NULL;
- packet->l3 = NULL;
- packet->l4 = NULL;
- packet->l7 = NULL;
-
- if (b.size < sizeof *eth) {
- return;
- }
+ /* Initialize packet's layer pointer and offsets. */
+ l2 = data;
+ ofpbuf_set_frame(packet, data);
- /* Link layer. */
- eth = b.data;
- memcpy(flow->dl_src, eth->eth_src, ETH_ADDR_LEN);
- memcpy(flow->dl_dst, eth->eth_dst, ETH_ADDR_LEN);
+ /* Must have full Ethernet header to proceed. */
+ if (OVS_UNLIKELY(size < sizeof(struct eth_header))) {
+ goto out;
+ } else {
+ ovs_be16 vlan_tci;
- /* dl_type, vlan_tci. */
- ofpbuf_pull(&b, ETH_ADDR_LEN * 2);
- if (eth->eth_type == htons(ETH_TYPE_VLAN)) {
- parse_vlan(&b, flow);
+ /* 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);
}
- flow->dl_type = parse_ethertype(&b);
- /* Parse mpls, copy l3 ttl. */
- if (eth_type_mpls(flow->dl_type)) {
- packet->l2_5 = b.data;
- parse_mpls(&b, flow);
+ /* 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 = b.data;
- if (flow->dl_type == htons(ETH_TYPE_IP)) {
- const struct ip_header *nh = pull_ip(&b);
- if (nh) {
- packet->l4 = b.data;
-
- flow->nw_src = get_16aligned_be32(&nh->ip_src);
- flow->nw_dst = get_16aligned_be32(&nh->ip_dst);
- flow->nw_proto = nh->ip_proto;
-
- flow->nw_tos = nh->ip_tos;
- if (IP_IS_FRAGMENT(nh->ip_frag_off)) {
- flow->nw_frag = FLOW_NW_FRAG_ANY;
- if (nh->ip_frag_off & htons(IP_FRAG_OFF_MASK)) {
- flow->nw_frag |= FLOW_NW_FRAG_LATER;
- }
+ 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;
}
- flow->nw_ttl = nh->ip_ttl;
-
- if (!(nh->ip_frag_off & htons(IP_FRAG_OFF_MASK))) {
- if (flow->nw_proto == IPPROTO_TCP) {
- parse_tcp(packet, &b, flow);
- } else if (flow->nw_proto == IPPROTO_UDP) {
- parse_udp(packet, &b, flow);
- } else if (flow->nw_proto == IPPROTO_SCTP) {
- parse_sctp(packet, &b, flow);
- } else if (flow->nw_proto == IPPROTO_ICMP) {
- const struct icmp_header *icmp = pull_icmp(&b);
- if (icmp) {
- flow->tp_src = htons(icmp->icmp_type);
- flow->tp_dst = htons(icmp->icmp_code);
- packet->l7 = b.data;
+ }
+ 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 (flow->dl_type == htons(ETH_TYPE_IPV6)) {
- if (parse_ipv6(&b, flow)) {
- return;
- }
+ } 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)));
+ }
- packet->l4 = b.data;
- if (flow->nw_proto == IPPROTO_TCP) {
- parse_tcp(packet, &b, flow);
- } else if (flow->nw_proto == IPPROTO_UDP) {
- parse_udp(packet, &b, flow);
- } else if (flow->nw_proto == IPPROTO_SCTP) {
- parse_sctp(packet, &b, flow);
- } else if (flow->nw_proto == IPPROTO_ICMPV6) {
- if (parse_icmpv6(&b, flow)) {
- packet->l7 = b.data;
+ /* 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);
}
}
- } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
- flow->dl_type == htons(ETH_TYPE_RARP)) {
- const struct arp_eth_header *arp = pull_arp(&b);
- if (arp && arp->ar_hrd == htons(1)
- && arp->ar_pro == htons(ETH_TYPE_IP)
- && arp->ar_hln == ETH_ADDR_LEN
- && arp->ar_pln == 4) {
- /* We only match on the lower 8 bits of the opcode. */
- if (ntohs(arp->ar_op) <= 0xff) {
- flow->nw_proto = ntohs(arp->ar_op);
+ 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;
- flow->nw_src = get_16aligned_be32(&arp->ar_spa);
- flow->nw_dst = get_16aligned_be32(&arp->ar_tpa);
- memcpy(flow->arp_sha, arp->ar_sha, ETH_ADDR_LEN);
- memcpy(flow->arp_tha, arp->ar_tha, ETH_ADDR_LEN);
+ 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_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))) {
+ if (nd_target) {
+ miniflow_push_words(mf, nd_target, nd_target,
+ sizeof *nd_target / 4);
+ }
+ miniflow_push_words(mf, arp_sha, arp_buf,
+ ETH_ADDR_LEN * 2 / 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
}
}
+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 == 22);
+ BUILD_ASSERT_DECL(FLOW_WC_SEQ == 26);
+ 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;
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)
{
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
}
}
-/* Perform a bitwise OR of miniflow 'src' flow data with the equivalent
- * fields in 'dst', storing the result in 'dst'. */
-static void
-flow_union_with_miniflow(struct flow *dst, const struct miniflow *src)
-{
- uint32_t *dst_u32 = (uint32_t *) dst;
- int ofs = 0;
- uint64_t map;
-
- for (map = src->map; map; map = zero_rightmost_1bit(map)) {
- dst_u32[raw_ctz64(map)] |= src->values[ofs++];
- }
-}
-
-/* Fold minimask 'mask''s wildcard mask into 'wc's wildcard mask. */
-void
-flow_wildcards_fold_minimask(struct flow_wildcards *wc,
- const struct minimask *mask)
-{
- flow_union_with_miniflow(&wc->masks, &mask->masks);
-}
-
/* Returns a hash of the wildcards in 'wc'. */
uint32_t
flow_wildcards_hash(const struct flow_wildcards *wc, uint32_t basis)
wc->masks.regs[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 = mhash_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 = mhash_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 = mhash_add(hash, value);
+ }
+ }
+ hash = mhash_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 = mhash_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 = mhash_add(hash, flow_u32[ofs++]);
+ }
+ } else {
+ hash = mhash_add(hash, (OVS_FORCE uint32_t) flow->nw_src);
+ hash = mhash_add(hash, (OVS_FORCE uint32_t) flow->nw_dst);
+ }
+ hash = mhash_add(hash, flow_u32[offsetof(struct flow, tp_src) / 4]);
+
+ hash = mhash_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)
}
if (is_ip_any(flow)) {
memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
- memset(&wc->masks.tp_src, 0xff, sizeof wc->masks.tp_src);
- memset(&wc->masks.tp_dst, 0xff, sizeof wc->masks.tp_dst);
+ flow_unwildcard_tp_ports(flow, wc);
}
wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI);
break;
default:
- NOT_REACHED();
+ OVS_NOT_REACHED();
}
}
return flow_hash_symmetric_l4(flow, basis);
}
- NOT_REACHED();
+ OVS_NOT_REACHED();
}
/* Returns a string representation of 'fields'. */
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 == 26);
+ 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, ovs_be32 label)
+flow_set_mpls_label(struct flow *flow, int idx, ovs_be32 label)
{
- set_mpls_lse_label(&flow->mpls_lse, 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, uint8_t ttl)
+flow_set_mpls_ttl(struct flow *flow, int idx, uint8_t ttl)
{
- set_mpls_lse_ttl(&flow->mpls_lse, 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, uint8_t tc)
+flow_set_mpls_tc(struct flow *flow, int idx, uint8_t tc)
{
- set_mpls_lse_tc(&flow->mpls_lse, 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, uint8_t bos)
+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)
{
- set_mpls_lse_bos(&flow->mpls_lse, bos);
+ 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_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
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 = b->l2;
- eth->eth_type = htons(b->size);
+ 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, flow->vlan_tci);
+ eth_push_vlan(b, htons(ETH_TYPE_VLAN), flow->vlan_tci);
}
if (flow->dl_type == htons(ETH_TYPE_IP)) {
struct ip_header *ip;
- b->l3 = ip = ofpbuf_put_zeros(b, sizeof *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_frag_off |= htons(100);
}
}
- 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;
-
- b->l4 = tcp = ofpbuf_put_zeros(b, sizeof *tcp);
- 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;
-
- b->l4 = udp = ofpbuf_put_zeros(b, sizeof *udp);
- udp->udp_src = flow->tp_src;
- udp->udp_dst = flow->tp_dst;
- } else if (flow->nw_proto == IPPROTO_SCTP) {
- struct sctp_header *sctp;
-
- b->l4 = sctp = ofpbuf_put_zeros(b, sizeof *sctp);
- sctp->sctp_src = flow->tp_src;
- sctp->sctp_dst = flow->tp_dst;
- } else if (flow->nw_proto == IPPROTO_ICMP) {
- struct icmp_header *icmp;
-
- b->l4 = icmp = ofpbuf_put_zeros(b, sizeof *icmp);
- icmp->icmp_type = ntohs(flow->tp_src);
- icmp->icmp_code = ntohs(flow->tp_dst);
- icmp->icmp_csum = csum(icmp, ICMP_HEADER_LEN);
- }
- b->l7 = ofpbuf_tail(b);
- }
- ip = b->l3;
- ip->ip_tot_len = htons((uint8_t *) b->data + b->size
- - (uint8_t *) b->l3);
+ ofpbuf_set_l4(b, ofpbuf_tail(b));
+
+ l4_len = flow_compose_l4(b, flow);
+
+ 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)) {
- /* XXX */
+ 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->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;
- b->l3 = arp = ofpbuf_put_zeros(b, sizeof *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;
}
if (eth_type_mpls(flow->dl_type)) {
- b->l2_5 = b->l3;
- push_mpls(b, flow->dl_type, flow->mpls_lse);
+ 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]);
+ }
}
}
\f
static int
miniflow_n_values(const struct miniflow *flow)
{
- return popcount64(flow->map);
+ return count_1bits(flow->map);
}
static uint32_t *
/* 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 nonzero uint32_t elements of 'src'. 'n' must be the number
- * of 1-bits in 'dst->map'.
+ * 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 'dst->values' (either inline if possible or with
- * malloc() otherwise) and copies the nonzero uint32_t elements of 'src' into
- * it. */
+ * 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)
{
dst->values = miniflow_alloc_values(dst, n);
ofs = 0;
for (map = dst->map; map; map = zero_rightmost_1bit(map)) {
- dst->values[ofs++] = src_u32[raw_ctz64(map)];
+ dst->values[ofs++] = src_u32[raw_ctz(map)];
}
}
flow_union_with_miniflow(dst, src);
}
-static const uint32_t *
-miniflow_get__(const struct miniflow *flow, unsigned int u32_ofs)
-{
- if (!(flow->map & (UINT64_C(1) << u32_ofs))) {
- static const uint32_t zero = 0;
- return &zero;
- }
- return flow->values
- + popcount64(flow->map & ((UINT64_C(1) << u32_ofs) - 1));
-}
-
/* Returns the uint32_t that would be at byte offset '4 * u32_ofs' if 'flow'
* were expanded into a "struct flow". */
-uint32_t
+static uint32_t
miniflow_get(const struct miniflow *flow, unsigned int u32_ofs)
{
- return *miniflow_get__(flow, u32_ofs);
-}
-
-/* Returns the ovs_be16 that would be at byte offset 'u8_ofs' if 'flow' were
- * expanded into a "struct flow". */
-static ovs_be16
-miniflow_get_be16(const struct miniflow *flow, unsigned int u8_ofs)
-{
- const uint32_t *u32p = miniflow_get__(flow, u8_ofs / 4);
- const ovs_be16 *be16p = (const ovs_be16 *) u32p;
- return be16p[u8_ofs % 4 != 0];
-}
-
-/* Returns the VID within the vlan_tci member of the "struct flow" represented
- * by 'flow'. */
-uint16_t
-miniflow_get_vid(const struct miniflow *flow)
-{
- ovs_be16 tci = miniflow_get_be16(flow, offsetof(struct flow, vlan_tci));
- return vlan_tci_to_vid(tci);
+ return (flow->map & UINT64_C(1) << u32_ofs)
+ ? *(flow->values +
+ count_1bits(flow->map & ((UINT64_C(1) << u32_ofs) - 1)))
+ : 0;
}
/* Returns true if 'a' and 'b' are the same flow, false otherwise. */
p = mask->masks.values;
for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
- int ofs = raw_ctz64(map);
+ int ofs = raw_ctz(map);
if ((miniflow_get(a, ofs) ^ miniflow_get(b, ofs)) & *p) {
return false;
p = mask->masks.values;
for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
- int ofs = raw_ctz64(map);
+ int ofs = raw_ctz(map);
if ((miniflow_get(a, ofs) ^ b_u32[ofs]) & *p) {
return false;
return true;
}
-/* Returns a hash value for 'flow', given 'basis'. */
-uint32_t
-miniflow_hash(const struct miniflow *flow, uint32_t basis)
-{
- const uint32_t *p = flow->values;
- uint32_t hash = basis;
- uint64_t hash_map = 0;
- uint64_t map;
-
- for (map = flow->map; map; map = zero_rightmost_1bit(map)) {
- if (*p) {
- hash = mhash_add(hash, *p);
- hash_map |= rightmost_1bit(map);
- }
- p++;
- }
- hash = mhash_add(hash, hash_map);
- hash = mhash_add(hash, hash_map >> 32);
-
- return mhash_finish(hash, p - flow->values);
-}
-
-/* Returns a hash value for the bits of 'flow' where there are 1-bits in
- * 'mask', given 'basis'.
- *
- * The hash values returned by this function are the same as those returned by
- * flow_hash_in_minimask(), only the form of the arguments differ. */
-uint32_t
-miniflow_hash_in_minimask(const struct miniflow *flow,
- const struct minimask *mask, uint32_t basis)
-{
- const uint32_t *p = mask->masks.values;
- uint32_t hash;
- uint64_t map;
-
- hash = basis;
-
- for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
- if (*p) {
- int ofs = raw_ctz64(map);
- hash = mhash_add(hash, miniflow_get(flow, ofs) & *p);
- }
- p++;
- }
-
- return mhash_finish(hash, (p - mask->masks.values) * 4);
-}
-
-/* Returns a hash value for the bits of 'flow' where there are 1-bits in
- * 'mask', given 'basis'.
- *
- * The hash values returned by this function are the same as those returned by
- * miniflow_hash_in_minimask(), only the form of the arguments differ. */
-uint32_t
-flow_hash_in_minimask(const struct flow *flow, const struct minimask *mask,
- uint32_t basis)
-{
- const uint32_t *flow_u32 = (const uint32_t *)flow;
- const uint32_t *p = mask->masks.values;
- uint32_t hash;
- uint64_t map;
-
- hash = basis;
- for (map = mask->masks.map; map; map = zero_rightmost_1bit(map)) {
- if (*p) {
- hash = mhash_add(hash, flow_u32[raw_ctz64(map)] & *p);
- }
- p++;
- }
-
- return mhash_finish(hash, (p - mask->masks.values) * 4);
-}
\f
/* Initializes 'dst' as a copy of 'src'. The caller must eventually free 'dst'
* with minimask_destroy(). */
dst->map = 0;
for (map = a->map & b->map; map; map = zero_rightmost_1bit(map)) {
- int ofs = raw_ctz64(map);
+ int ofs = raw_ctz(map);
uint32_t mask = miniflow_get(a, ofs) & miniflow_get(b, ofs);
if (mask) {
return miniflow_get(&mask->masks, u32_ofs);
}
-/* Returns the VID mask within the vlan_tci member of the "struct
- * flow_wildcards" represented by 'mask'. */
-uint16_t
-minimask_get_vid_mask(const struct minimask *mask)
-{
- return miniflow_get_vid(&mask->masks);
-}
-
/* 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 a hash value for 'mask', given 'basis'. */
-uint32_t
-minimask_hash(const struct minimask *mask, uint32_t basis)
-{
- return miniflow_hash(&mask->masks, basis);
-}
-
-/* Returns true if at least one bit is wildcarded in 'a_' but not in 'b_',
+/* 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_)
+minimask_has_extra(const struct minimask *a, const struct minimask *b)
{
- const struct miniflow *a = &a_->masks;
- const struct miniflow *b = &b_->masks;
+ const uint32_t *p = b->masks.values;
uint64_t map;
- for (map = a->map | b->map; map; map = zero_rightmost_1bit(map)) {
- int ofs = raw_ctz64(map);
- uint32_t a_u32 = miniflow_get(a, ofs);
- uint32_t b_u32 = miniflow_get(b, ofs);
+ 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;
}
-
-/* Returns true if 'mask' matches every packet, false if 'mask' fixes any bits
- * or fields. */
-bool
-minimask_is_catchall(const struct minimask *mask_)
-{
- const struct miniflow *mask = &mask_->masks;
- const uint32_t *p = mask->values;
- uint64_t map;
-
- for (map = mask->map; map; map = zero_rightmost_1bit(map)) {
- if (*p++) {
- return false;
- }
- }
- return true;
-}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff