/* NX1.0+(34): struct nx_action_conjunction. */
NXAST_RAW_CONJUNCTION,
+ /* NX1.0+(35): struct nx_action_conntrack, ... */
+ NXAST_RAW_CT,
+
/* ## ------------------ ## */
/* ## Debugging actions. ## */
/* ## ------------------ ## */
static char *OVS_WARN_UNUSED_RESULT ofpacts_parse(
char *str, struct ofpbuf *ofpacts, enum ofputil_protocol *usable_protocols,
bool allow_instructions, enum ofpact_type outer_action);
+static enum ofperr ofpacts_pull_openflow_actions__(
+ struct ofpbuf *openflow, unsigned int actions_len,
+ enum ofp_version version, uint32_t allowed_ovsinsts,
+ struct ofpbuf *ofpacts, enum ofpact_type outer_action);
/* Pull off existing actions or instructions. Used by nesting actions to keep
* ofpacts_parse() oblivious of actions nesting.
{
ds_put_cstr(s, "debug_recirc");
}
+
+/* Action structure for NXAST_CT.
+ *
+ * Pass traffic to the connection tracker.
+ *
+ * There are two important concepts to understanding the connection tracking
+ * interface: Packet state and Connection state. Packets may be "Untracked" or
+ * "Tracked". Connections may be "Uncommitted" or "Committed".
+ *
+ * - Packet State:
+ *
+ * Untracked packets have not yet passed through the connection tracker,
+ * and the connection state for such packets is unknown. In most cases,
+ * packets entering the OpenFlow pipeline will initially be in the
+ * untracked state. Untracked packets may become tracked by executing
+ * NXAST_CT with a "recirc_table" specified. This makes various aspects
+ * about the connection available, in particular the connection state.
+ *
+ * Tracked packets have previously passed through the connection tracker.
+ * These packets will remain tracked through until the end of the OpenFlow
+ * pipeline. Tracked packets which have NXAST_CT executed with a
+ * "recirc_table" specified will return to the tracked state.
+ *
+ * The packet state is only significant for the duration of packet
+ * processing within the OpenFlow pipeline.
+ *
+ * - Connection State:
+ *
+ * Multiple packets may be associated with a single connection. Initially,
+ * all connections are uncommitted. The connection state corresponding to
+ * a packet is available in the NXM_NX_CT_STATE field for tracked packets.
+ *
+ * Uncommitted connections have no state stored about them. Uncommitted
+ * connections may transition into the committed state by executing
+ * NXAST_CT with the NX_CT_F_COMMIT flag.
+ *
+ * Once a connection becomes committed, information may be gathered about
+ * the connection by passing subsequent packets through the connection
+ * tracker, and the state of the connection will be stored beyond the
+ * lifetime of packet processing.
+ *
+ * Connections may transition back into the uncommitted state due to
+ * external timers, or due to the contents of packets that are sent to the
+ * connection tracker. This behaviour is outside of the scope of the
+ * OpenFlow interface.
+ *
+ * The "zone" specifies a context within which the tracking is done:
+ *
+ * The connection tracking zone is a 16-bit number. Each zone is an
+ * independent connection tracking context. The connection state for each
+ * connection is completely separate for each zone, so if a connection
+ * is committed to zone A, then it will remain uncommitted in zone B.
+ * If NXAST_CT is executed with the same zone multiple times, later
+ * executions have no effect.
+ *
+ * If 'zone_src' is nonzero, this specifies that the zone should be
+ * sourced from a field zone_src[ofs:ofs+nbits]. The format and semantics
+ * of 'zone_src' and 'zone_ofs_nbits' are similar to those for the
+ * NXAST_REG_LOAD action. The acceptable nxm_header values for 'zone_src'
+ * are the same as the acceptable nxm_header values for the 'src' field of
+ * NXAST_REG_MOVE.
+ *
+ * If 'zone_src' is zero, then the value of 'zone_imm' will be used as the
+ * connection tracking zone.
+ *
+ * The "recirc_table" allows NXM_NX_CT_* fields to become available:
+ *
+ * If "recirc_table" has a value other than NX_CT_RECIRC_NONE, then the
+ * packet will be logically cloned prior to executing this action. One
+ * copy will be sent to the connection tracker, then will be re-injected
+ * into the OpenFlow pipeline beginning at the OpenFlow table specified in
+ * this field. When the packet re-enters the pipeline, the NXM_NX_CT_*
+ * fields will be populated. The original instance of the packet will
+ * continue the current actions list. This can be thought of as similar to
+ * the effect of the "output" action: One copy is sent out (in this case,
+ * to the connection tracker), but the current copy continues processing.
+ *
+ * It is strongly recommended that this table is later than the current
+ * table, to prevent loops.
+ */
+struct nx_action_conntrack {
+ ovs_be16 type; /* OFPAT_VENDOR. */
+ ovs_be16 len; /* At least 24. */
+ ovs_be32 vendor; /* NX_VENDOR_ID. */
+ ovs_be16 subtype; /* NXAST_CT. */
+ ovs_be16 flags; /* Zero or more NX_CT_F_* flags.
+ * Unspecified flag bits must be zero. */
+ ovs_be32 zone_src; /* Connection tracking context. */
+ union {
+ ovs_be16 zone_ofs_nbits;/* Range to use from source field. */
+ ovs_be16 zone_imm; /* Immediate value for zone. */
+ };
+ uint8_t recirc_table; /* Recirculate to a specific table, or
+ NX_CT_RECIRC_NONE for no recirculation. */
+ uint8_t pad[5]; /* Zeroes */
+ /* Followed by a sequence of zero or more OpenFlow actions. The length of
+ * these is included in 'len'. */
+};
+OFP_ASSERT(sizeof(struct nx_action_conntrack) == 24);
+
+static enum ofperr
+decode_ct_zone(const struct nx_action_conntrack *nac,
+ struct ofpact_conntrack *out)
+{
+ if (nac->zone_src) {
+ enum ofperr error;
+
+ out->zone_src.field = mf_from_nxm_header(ntohl(nac->zone_src));
+ out->zone_src.ofs = nxm_decode_ofs(nac->zone_ofs_nbits);
+ out->zone_src.n_bits = nxm_decode_n_bits(nac->zone_ofs_nbits);
+ error = mf_check_src(&out->zone_src, NULL);
+ if (error) {
+ return error;
+ }
+
+ if (out->zone_src.n_bits != 16) {
+ VLOG_WARN_RL(&rl, "zone n_bits %d not within valid range [16..16]",
+ out->zone_src.n_bits);
+ return OFPERR_OFPBAC_BAD_SET_LEN;
+ }
+ } else {
+ out->zone_src.field = NULL;
+ out->zone_imm = ntohs(nac->zone_imm);
+ }
+
+ return 0;
+}
+
+static enum ofperr
+decode_NXAST_RAW_CT(const struct nx_action_conntrack *nac,
+ enum ofp_version ofp_version OVS_UNUSED,
+ struct ofpbuf *out)
+{
+ struct ofpact_conntrack *conntrack;
+ int error = 0;
+
+ conntrack = ofpact_put_CT(out);
+ conntrack->flags = ntohs(nac->flags);
+ error = decode_ct_zone(nac, conntrack);
+ if (error) {
+ goto out;
+ }
+ conntrack->recirc_table = nac->recirc_table;
+
+out:
+ return error;
+}
+
+static void
+encode_CT(const struct ofpact_conntrack *conntrack,
+ enum ofp_version ofp_version OVS_UNUSED, struct ofpbuf *out)
+{
+ struct nx_action_conntrack *nac;
+
+ nac = put_NXAST_CT(out);
+ nac->flags = htons(conntrack->flags);
+ if (conntrack->zone_src.field) {
+ nac->zone_src = htonl(mf_nxm_header(conntrack->zone_src.field->id));
+ nac->zone_ofs_nbits = nxm_encode_ofs_nbits(conntrack->zone_src.ofs,
+ conntrack->zone_src.n_bits);
+ } else {
+ nac->zone_src = htonl(0);
+ nac->zone_imm = htons(conntrack->zone_imm);
+ }
+ nac->recirc_table = conntrack->recirc_table;
+}
+
+/* Parses 'arg' as the argument to a "ct" action, and appends such an
+ * action to 'ofpacts'.
+ *
+ * Returns NULL if successful, otherwise a malloc()'d string describing the
+ * error. The caller is responsible for freeing the returned string. */
+static char * OVS_WARN_UNUSED_RESULT
+parse_CT(char *arg, struct ofpbuf *ofpacts,
+ enum ofputil_protocol *usable_protocols OVS_UNUSED)
+{
+ struct ofpact_conntrack *oc;
+ char *error = NULL;
+ char *key, *value;
+
+ oc = ofpact_put_CT(ofpacts);
+ oc->flags = 0;
+ oc->recirc_table = NX_CT_RECIRC_NONE;
+ while (ofputil_parse_key_value(&arg, &key, &value)) {
+ if (!strcmp(key, "commit")) {
+ oc->flags |= NX_CT_F_COMMIT;
+ } else if (!strcmp(key, "table")) {
+ error = str_to_u8(value, "recirc_table", &oc->recirc_table);
+ if (!error && oc->recirc_table == NX_CT_RECIRC_NONE) {
+ error = xasprintf("invalid table %#"PRIx16, oc->recirc_table);
+ }
+ } else if (!strcmp(key, "zone")) {
+ error = str_to_u16(value, "zone", &oc->zone_imm);
+
+ if (error) {
+ free(error);
+ error = mf_parse_subfield(&oc->zone_src, value);
+ if (error) {
+ return error;
+ }
+ }
+ } else {
+ error = xasprintf("invalid argument to \"ct\" action: `%s'", key);
+ }
+ if (error) {
+ break;
+ }
+ }
+
+ return error;
+}
+
+static void
+format_CT(const struct ofpact_conntrack *a, struct ds *s)
+{
+ ds_put_cstr(s, "ct(");
+ if (a->flags & NX_CT_F_COMMIT) {
+ ds_put_cstr(s, "commit,");
+ }
+ if (a->recirc_table != NX_CT_RECIRC_NONE) {
+ ds_put_format(s, "table=%"PRIu8",", a->recirc_table);
+ }
+ if (a->zone_src.field) {
+ ds_put_format(s, "zone=");
+ mf_format_subfield(&a->zone_src, s);
+ ds_put_char(s, ',');
+ } else if (a->zone_imm) {
+ ds_put_format(s, "zone=%"PRIu16",", a->zone_imm);
+ }
+ ds_chomp(s, ',');
+ ds_put_char(s, ')');
+}
\f
/* Meter instruction. */
return true;
case OFPACT_BUNDLE:
case OFPACT_CLEAR_ACTIONS:
+ case OFPACT_CT:
case OFPACT_CONTROLLER:
case OFPACT_DEC_MPLS_TTL:
case OFPACT_DEC_TTL:
* in the action set is undefined. */
case OFPACT_BUNDLE:
case OFPACT_CONTROLLER:
+ case OFPACT_CT:
case OFPACT_ENQUEUE:
case OFPACT_EXIT:
case OFPACT_UNROLL_XLATE:
case OFPACT_UNROLL_XLATE:
case OFPACT_SAMPLE:
case OFPACT_DEBUG_RECIRC:
+ case OFPACT_CT:
default:
return OVSINST_OFPIT11_APPLY_ACTIONS;
}
case OFPACT_SAMPLE:
return 0;
+ case OFPACT_CT: {
+ struct ofpact_conntrack *oc = ofpact_get_CT(a);
+
+ if (!dl_type_is_ip_any(flow->dl_type)
+ || (flow->ct_state & CS_INVALID && oc->flags & NX_CT_F_COMMIT)) {
+ inconsistent_match(usable_protocols);
+ }
+
+ if (oc->zone_src.field) {
+ return mf_check_src(&oc->zone_src, flow);
+ }
+ return 0;
+ }
+
case OFPACT_CLEAR_ACTIONS:
return 0;
case OFPACT_METER:
case OFPACT_GROUP:
case OFPACT_DEBUG_RECIRC:
+ case OFPACT_CT:
default:
return false;
}
projects / mirror_ovs.git / blobdiff