/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford * Junior University * * We are making the OpenFlow specification and associated documentation * (Software) available for public use and benefit with the expectation * that others will use, modify and enhance the Software and contribute * those enhancements back to the community. However, since we would * like to make the Software available for broadest use, with as few * restrictions as possible permission is hereby granted, free of * charge, to any person obtaining a copy of this Software to deal in * the Software under the copyrights without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * The name and trademarks of copyright holder(s) may NOT be used in * advertising or publicity pertaining to the Software or any * derivatives without specific, written prior permission. */ #include #include "vconn-provider.h" #include #include #include #include #include #include #include #include "dynamic-string.h" #include "flow.h" #include "ofp-print.h" #include "ofpbuf.h" #include "openflow/openflow.h" #include "poll-loop.h" #include "random.h" #include "util.h" #define THIS_MODULE VLM_vconn #include "vlog.h" /* State of an active vconn.*/ enum vconn_state { /* This is the ordinary progression of states. */ VCS_CONNECTING, /* Underlying vconn is not connected. */ VCS_SEND_HELLO, /* Waiting to send OFPT_HELLO message. */ VCS_RECV_HELLO, /* Waiting to receive OFPT_HELLO message. */ VCS_CONNECTED, /* Connection established. */ /* These states are entered only when something goes wrong. */ VCS_SEND_ERROR, /* Sending OFPT_ERROR message. */ VCS_DISCONNECTED /* Connection failed or connection closed. */ }; static struct vconn_class *vconn_classes[] = { &tcp_vconn_class, &unix_vconn_class, #ifdef HAVE_NETLINK &netlink_vconn_class, #endif #ifdef HAVE_OPENSSL &ssl_vconn_class, #endif }; static struct pvconn_class *pvconn_classes[] = { &ptcp_pvconn_class, &punix_pvconn_class, #ifdef HAVE_OPENSSL &pssl_pvconn_class, #endif }; /* High rate limit because most of the rate-limiting here is individual * OpenFlow messages going over the vconn. If those are enabled then we * really need to see them. */ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(600, 600); static int do_recv(struct vconn *, struct ofpbuf **); static int do_send(struct vconn *, struct ofpbuf *); /* Check the validity of the vconn class structures. */ static void check_vconn_classes(void) { #ifndef NDEBUG size_t i; for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) { struct vconn_class *class = vconn_classes[i]; assert(class->name != NULL); assert(class->open != NULL); if (class->close || class->recv || class->send || class->wait) { assert(class->close != NULL); assert(class->recv != NULL); assert(class->send != NULL); assert(class->wait != NULL); } else { /* This class delegates to another one. */ } } for (i = 0; i < ARRAY_SIZE(pvconn_classes); i++) { struct pvconn_class *class = pvconn_classes[i]; assert(class->name != NULL); assert(class->listen != NULL); if (class->close || class->accept || class->wait) { assert(class->close != NULL); assert(class->accept != NULL); assert(class->wait != NULL); } else { /* This class delegates to another one. */ } } #endif } /* Prints information on active (if 'active') and passive (if 'passive') * connection methods supported by the vconn. If 'bootstrap' is true, also * advertises options to bootstrap the CA certificate. */ void vconn_usage(bool active, bool passive, bool bootstrap UNUSED) { /* Really this should be implemented via callbacks into the vconn * providers, but that seems too heavy-weight to bother with at the * moment. */ printf("\n"); if (active) { printf("Active OpenFlow connection methods:\n"); #ifdef HAVE_NETLINK printf(" nl:DP_IDX " "local datapath DP_IDX\n"); #endif printf(" tcp:HOST[:PORT] " "PORT (default: %d) on remote TCP HOST\n", OFP_TCP_PORT); #ifdef HAVE_OPENSSL printf(" ssl:HOST[:PORT] " "SSL PORT (default: %d) on remote HOST\n", OFP_SSL_PORT); #endif printf(" unix:FILE Unix domain socket named FILE\n"); } if (passive) { printf("Passive OpenFlow connection methods:\n"); printf(" ptcp:[PORT] " "listen to TCP PORT (default: %d)\n", OFP_TCP_PORT); #ifdef HAVE_OPENSSL printf(" pssl:[PORT] " "listen for SSL on PORT (default: %d)\n", OFP_SSL_PORT); #endif printf(" punix:FILE " "listen on Unix domain socket FILE\n"); } #ifdef HAVE_OPENSSL printf("PKI configuration (required to use SSL):\n" " -p, --private-key=FILE file with private key\n" " -c, --certificate=FILE file with certificate for private key\n" " -C, --ca-cert=FILE file with peer CA certificate\n"); if (bootstrap) { printf(" --bootstrap-ca-cert=FILE file with peer CA certificate " "to read or create\n"); } #endif } /* Attempts to connect to an OpenFlow device. 'name' is a connection name in * the form "TYPE:ARGS", where TYPE is an active vconn class's name and ARGS * are vconn class-specific. * * The vconn will automatically negotiate an OpenFlow protocol version * acceptable to both peers on the connection. The version negotiated will be * no lower than 'min_version' and no higher than OFP_VERSION. * * Returns 0 if successful, otherwise a positive errno value. If successful, * stores a pointer to the new connection in '*vconnp', otherwise a null * pointer. */ int vconn_open(const char *name, int min_version, struct vconn **vconnp) { size_t prefix_len; size_t i; check_vconn_classes(); *vconnp = NULL; prefix_len = strcspn(name, ":"); if (prefix_len == strlen(name)) { return EAFNOSUPPORT; } for (i = 0; i < ARRAY_SIZE(vconn_classes); i++) { struct vconn_class *class = vconn_classes[i]; if (strlen(class->name) == prefix_len && !memcmp(class->name, name, prefix_len)) { struct vconn *vconn; char *suffix_copy = xstrdup(name + prefix_len + 1); int retval = class->open(name, suffix_copy, &vconn); free(suffix_copy); if (!retval) { assert(vconn->state != VCS_CONNECTING || vconn->class->connect); vconn->min_version = min_version; *vconnp = vconn; } return retval; } } return EAFNOSUPPORT; } int vconn_open_block(const char *name, int min_version, struct vconn **vconnp) { struct vconn *vconn; int error; error = vconn_open(name, min_version, &vconn); while (error == EAGAIN) { vconn_connect_wait(vconn); poll_block(); error = vconn_connect(vconn); assert(error != EINPROGRESS); } if (error) { vconn_close(vconn); *vconnp = NULL; } else { *vconnp = vconn; } return error; } /* Closes 'vconn'. */ void vconn_close(struct vconn *vconn) { if (vconn != NULL) { char *name = vconn->name; (vconn->class->close)(vconn); free(name); } } /* Returns the name of 'vconn', that is, the string passed to vconn_open(). */ const char * vconn_get_name(const struct vconn *vconn) { return vconn->name; } /* Returns the IP address of the peer, or 0 if the peer is not connected over * an IP-based protocol or if its IP address is not yet known. */ uint32_t vconn_get_ip(const struct vconn *vconn) { return vconn->ip; } static void vcs_connecting(struct vconn *vconn) { int retval = (vconn->class->connect)(vconn); assert(retval != EINPROGRESS); if (!retval) { vconn->state = VCS_SEND_HELLO; } else if (retval != EAGAIN) { vconn->state = VCS_DISCONNECTED; vconn->error = retval; } } static void vcs_send_hello(struct vconn *vconn) { struct ofpbuf *b; int retval; make_openflow(sizeof(struct ofp_header), OFPT_HELLO, &b); retval = do_send(vconn, b); if (!retval) { vconn->state = VCS_RECV_HELLO; } else { ofpbuf_delete(b); if (retval != EAGAIN) { vconn->state = VCS_DISCONNECTED; vconn->error = retval; } } } static void vcs_recv_hello(struct vconn *vconn) { struct ofpbuf *b; int retval; retval = do_recv(vconn, &b); if (!retval) { struct ofp_header *oh = b->data; if (oh->type == OFPT_HELLO) { if (b->size > sizeof *oh) { struct ds msg = DS_EMPTY_INITIALIZER; ds_put_format(&msg, "%s: extra-long hello:\n", vconn->name); ds_put_hex_dump(&msg, b->data, b->size, 0, true); VLOG_WARN_RL(&rl, "%s", ds_cstr(&msg)); ds_destroy(&msg); } vconn->version = MIN(OFP_VERSION, oh->version); if (vconn->version < vconn->min_version) { VLOG_WARN_RL(&rl, "%s: version negotiation failed: we support " "versions 0x%02x to 0x%02x inclusive but peer " "supports no later than version 0x%02"PRIx8, vconn->name, vconn->min_version, OFP_VERSION, oh->version); vconn->state = VCS_SEND_ERROR; } else { VLOG_DBG("%s: negotiated OpenFlow version 0x%02x " "(we support versions 0x%02x to 0x%02x inclusive, " "peer no later than version 0x%02"PRIx8")", vconn->name, vconn->version, vconn->min_version, OFP_VERSION, oh->version); vconn->state = VCS_CONNECTED; } ofpbuf_delete(b); return; } else { char *s = ofp_to_string(b->data, b->size, 1); VLOG_WARN_RL(&rl, "%s: received message while expecting hello: %s", vconn->name, s); free(s); retval = EPROTO; ofpbuf_delete(b); } } if (retval != EAGAIN) { vconn->state = VCS_DISCONNECTED; vconn->error = retval; } } static void vcs_send_error(struct vconn *vconn) { struct ofp_error_msg *error; struct ofpbuf *b; char s[128]; int retval; snprintf(s, sizeof s, "We support versions 0x%02x to 0x%02x inclusive but " "you support no later than version 0x%02"PRIx8".", vconn->min_version, OFP_VERSION, vconn->version); error = make_openflow(sizeof *error, OFPT_ERROR, &b); error->type = htons(OFPET_HELLO_FAILED); error->code = htons(OFPHFC_INCOMPATIBLE); ofpbuf_put(b, s, strlen(s)); update_openflow_length(b); retval = do_send(vconn, b); if (retval) { ofpbuf_delete(b); } if (retval != EAGAIN) { vconn->state = VCS_DISCONNECTED; vconn->error = retval ? retval : EPROTO; } } /* Tries to complete the connection on 'vconn', which must be an active * vconn. If 'vconn''s connection is complete, returns 0 if the connection * was successful or a positive errno value if it failed. If the * connection is still in progress, returns EAGAIN. */ int vconn_connect(struct vconn *vconn) { enum vconn_state last_state; assert(vconn->min_version >= 0); do { last_state = vconn->state; switch (vconn->state) { case VCS_CONNECTING: vcs_connecting(vconn); break; case VCS_SEND_HELLO: vcs_send_hello(vconn); break; case VCS_RECV_HELLO: vcs_recv_hello(vconn); break; case VCS_CONNECTED: return 0; case VCS_SEND_ERROR: vcs_send_error(vconn); break; case VCS_DISCONNECTED: return vconn->error; default: NOT_REACHED(); } } while (vconn->state != last_state); return EAGAIN; } /* Tries to receive an OpenFlow message from 'vconn', which must be an active * vconn. If successful, stores the received message into '*msgp' and returns * 0. The caller is responsible for destroying the message with * ofpbuf_delete(). On failure, returns a positive errno value and stores a * null pointer into '*msgp'. On normal connection close, returns EOF. * * vconn_recv will not block waiting for a packet to arrive. If no packets * have been received, it returns EAGAIN immediately. */ int vconn_recv(struct vconn *vconn, struct ofpbuf **msgp) { int retval = vconn_connect(vconn); if (!retval) { retval = do_recv(vconn, msgp); } return retval; } static int do_recv(struct vconn *vconn, struct ofpbuf **msgp) { int retval; retval = (vconn->class->recv)(vconn, msgp); if (!retval) { struct ofp_header *oh; if (VLOG_IS_DBG_ENABLED()) { char *s = ofp_to_string((*msgp)->data, (*msgp)->size, 1); VLOG_DBG_RL(&rl, "%s: received: %s", vconn->name, s); free(s); } oh = ofpbuf_at_assert(*msgp, 0, sizeof *oh); if (oh->version != vconn->version && oh->type != OFPT_HELLO && oh->type != OFPT_ERROR && oh->type != OFPT_ECHO_REQUEST && oh->type != OFPT_ECHO_REPLY && oh->type != OFPT_VENDOR) { if (vconn->version < 0) { VLOG_ERR_RL(&rl, "%s: received OpenFlow message type %"PRIu8" " "before version negotiation complete", vconn->name, oh->type); } else { VLOG_ERR_RL(&rl, "%s: received OpenFlow version 0x%02"PRIx8" " "!= expected %02x", vconn->name, oh->version, vconn->version); } ofpbuf_delete(*msgp); retval = EPROTO; } } if (retval) { *msgp = NULL; } return retval; } /* Tries to queue 'msg' for transmission on 'vconn', which must be an active * vconn. If successful, returns 0, in which case ownership of 'msg' is * transferred to the vconn. Success does not guarantee that 'msg' has been or * ever will be delivered to the peer, only that it has been queued for * transmission. * * Returns a positive errno value on failure, in which case the caller * retains ownership of 'msg'. * * vconn_send will not block. If 'msg' cannot be immediately accepted for * transmission, it returns EAGAIN immediately. */ int vconn_send(struct vconn *vconn, struct ofpbuf *msg) { int retval = vconn_connect(vconn); if (!retval) { retval = do_send(vconn, msg); } return retval; } static int do_send(struct vconn *vconn, struct ofpbuf *msg) { int retval; assert(msg->size >= sizeof(struct ofp_header)); assert(((struct ofp_header *) msg->data)->length == htons(msg->size)); if (!VLOG_IS_DBG_ENABLED()) { retval = (vconn->class->send)(vconn, msg); } else { char *s = ofp_to_string(msg->data, msg->size, 1); retval = (vconn->class->send)(vconn, msg); if (retval != EAGAIN) { VLOG_DBG_RL(&rl, "%s: sent (%s): %s", vconn->name, strerror(retval), s); } free(s); } return retval; } /* Same as vconn_send, except that it waits until 'msg' can be transmitted. */ int vconn_send_block(struct vconn *vconn, struct ofpbuf *msg) { int retval; while ((retval = vconn_send(vconn, msg)) == EAGAIN) { vconn_send_wait(vconn); poll_block(); } return retval; } /* Same as vconn_recv, except that it waits until a message is received. */ int vconn_recv_block(struct vconn *vconn, struct ofpbuf **msgp) { int retval; while ((retval = vconn_recv(vconn, msgp)) == EAGAIN) { vconn_recv_wait(vconn); poll_block(); } return retval; } /* Waits until a message with a transaction ID matching 'xid' is recived on * 'vconn'. Returns 0 if successful, in which case the reply is stored in * '*replyp' for the caller to examine and free. Otherwise returns a positive * errno value, or EOF, and sets '*replyp' to null. * * 'request' is always destroyed, regardless of the return value. */ int vconn_recv_xid(struct vconn *vconn, uint32_t xid, struct ofpbuf **replyp) { for (;;) { uint32_t recv_xid; struct ofpbuf *reply; int error; error = vconn_recv_block(vconn, &reply); if (error) { *replyp = NULL; return error; } recv_xid = ((struct ofp_header *) reply->data)->xid; if (xid == recv_xid) { *replyp = reply; return 0; } VLOG_DBG_RL(&rl, "%s: received reply with xid %08"PRIx32" != expected " "%08"PRIx32, vconn->name, recv_xid, xid); ofpbuf_delete(reply); } } /* Sends 'request' to 'vconn' and blocks until it receives a reply with a * matching transaction ID. Returns 0 if successful, in which case the reply * is stored in '*replyp' for the caller to examine and free. Otherwise * returns a positive errno value, or EOF, and sets '*replyp' to null. * * 'request' is always destroyed, regardless of the return value. */ int vconn_transact(struct vconn *vconn, struct ofpbuf *request, struct ofpbuf **replyp) { uint32_t send_xid = ((struct ofp_header *) request->data)->xid; int error; *replyp = NULL; error = vconn_send_block(vconn, request); if (error) { ofpbuf_delete(request); } return error ? error : vconn_recv_xid(vconn, send_xid, replyp); } void vconn_wait(struct vconn *vconn, enum vconn_wait_type wait) { assert(wait == WAIT_CONNECT || wait == WAIT_RECV || wait == WAIT_SEND); switch (vconn->state) { case VCS_CONNECTING: wait = WAIT_CONNECT; break; case VCS_SEND_HELLO: case VCS_SEND_ERROR: wait = WAIT_SEND; break; case VCS_RECV_HELLO: wait = WAIT_RECV; break; case VCS_CONNECTED: break; case VCS_DISCONNECTED: poll_immediate_wake(); return; } (vconn->class->wait)(vconn, wait); } void vconn_connect_wait(struct vconn *vconn) { vconn_wait(vconn, WAIT_CONNECT); } void vconn_recv_wait(struct vconn *vconn) { vconn_wait(vconn, WAIT_RECV); } void vconn_send_wait(struct vconn *vconn) { vconn_wait(vconn, WAIT_SEND); } /* Attempts to start listening for OpenFlow connections. 'name' is a * connection name in the form "TYPE:ARGS", where TYPE is an passive vconn * class's name and ARGS are vconn class-specific. * * Returns 0 if successful, otherwise a positive errno value. If successful, * stores a pointer to the new connection in '*pvconnp', otherwise a null * pointer. */ int pvconn_open(const char *name, struct pvconn **pvconnp) { size_t prefix_len; size_t i; check_vconn_classes(); *pvconnp = NULL; prefix_len = strcspn(name, ":"); if (prefix_len == strlen(name)) { return EAFNOSUPPORT; } for (i = 0; i < ARRAY_SIZE(pvconn_classes); i++) { struct pvconn_class *class = pvconn_classes[i]; if (strlen(class->name) == prefix_len && !memcmp(class->name, name, prefix_len)) { char *suffix_copy = xstrdup(name + prefix_len + 1); int retval = class->listen(name, suffix_copy, pvconnp); free(suffix_copy); if (retval) { *pvconnp = NULL; } return retval; } } return EAFNOSUPPORT; } /* Closes 'pvconn'. */ void pvconn_close(struct pvconn *pvconn) { if (pvconn != NULL) { char *name = pvconn->name; (pvconn->class->close)(pvconn); free(name); } } /* Tries to accept a new connection on 'pvconn'. If successful, stores the new * connection in '*new_vconn' and returns 0. Otherwise, returns a positive * errno value. * * The new vconn will automatically negotiate an OpenFlow protocol version * acceptable to both peers on the connection. The version negotiated will be * no lower than 'min_version' and no higher than OFP_VERSION. * * pvconn_accept() will not block waiting for a connection. If no connection * is ready to be accepted, it returns EAGAIN immediately. */ int pvconn_accept(struct pvconn *pvconn, int min_version, struct vconn **new_vconn) { int retval = (pvconn->class->accept)(pvconn, new_vconn); if (retval) { *new_vconn = NULL; } else { assert((*new_vconn)->state != VCS_CONNECTING || (*new_vconn)->class->connect); (*new_vconn)->min_version = min_version; } return retval; } void pvconn_wait(struct pvconn *pvconn) { (pvconn->class->wait)(pvconn); } /* Allocates and returns the first byte of a buffer 'openflow_len' bytes long, * containing an OpenFlow header with the given 'type' and a random transaction * id. Stores the new buffer in '*bufferp'. The caller must free the buffer * when it is no longer needed. */ void * make_openflow(size_t openflow_len, uint8_t type, struct ofpbuf **bufferp) { return make_openflow_xid(openflow_len, type, random_uint32(), bufferp); } /* Allocates and returns the first byte of a buffer 'openflow_len' bytes long, * containing an OpenFlow header with the given 'type' and transaction id * 'xid'. Stores the new buffer in '*bufferp'. The caller must free the * buffer when it is no longer needed. */ void * make_openflow_xid(size_t openflow_len, uint8_t type, uint32_t xid, struct ofpbuf **bufferp) { struct ofpbuf *buffer; struct ofp_header *oh; assert(openflow_len >= sizeof *oh); assert(openflow_len <= UINT16_MAX); buffer = *bufferp = ofpbuf_new(openflow_len); oh = ofpbuf_put_zeros(buffer, openflow_len); oh->version = OFP_VERSION; oh->type = type; oh->length = htons(openflow_len); oh->xid = xid; return oh; } /* Updates the 'length' field of the OpenFlow message in 'buffer' to * 'buffer->size'. */ void update_openflow_length(struct ofpbuf *buffer) { struct ofp_header *oh = ofpbuf_at_assert(buffer, 0, sizeof *oh); oh->length = htons(buffer->size); } struct ofpbuf * make_add_flow(const struct flow *flow, uint32_t buffer_id, uint16_t idle_timeout, size_t actions_len) { struct ofp_flow_mod *ofm; size_t size = sizeof *ofm + actions_len; struct ofpbuf *out = ofpbuf_new(size); ofm = ofpbuf_put_zeros(out, size); ofm->header.version = OFP_VERSION; ofm->header.type = OFPT_FLOW_MOD; ofm->header.length = htons(size); ofm->match.wildcards = htonl(0); ofm->match.in_port = flow->in_port; memcpy(ofm->match.dl_src, flow->dl_src, sizeof ofm->match.dl_src); memcpy(ofm->match.dl_dst, flow->dl_dst, sizeof ofm->match.dl_dst); ofm->match.dl_vlan = flow->dl_vlan; ofm->match.dl_type = flow->dl_type; ofm->match.nw_src = flow->nw_src; ofm->match.nw_dst = flow->nw_dst; ofm->match.nw_proto = flow->nw_proto; ofm->match.tp_src = flow->tp_src; ofm->match.tp_dst = flow->tp_dst; ofm->command = htons(OFPFC_ADD); ofm->idle_timeout = htons(idle_timeout); ofm->hard_timeout = htons(OFP_FLOW_PERMANENT); ofm->buffer_id = htonl(buffer_id); return out; } struct ofpbuf * make_add_simple_flow(const struct flow *flow, uint32_t buffer_id, uint16_t out_port, uint16_t idle_timeout) { struct ofp_action_output *oao; struct ofpbuf *buffer = make_add_flow(flow, buffer_id, idle_timeout, sizeof *oao); struct ofp_flow_mod *ofm = buffer->data; oao = (struct ofp_action_output *)&ofm->actions[0]; oao->type = htons(OFPAT_OUTPUT); oao->len = htons(sizeof *oao); oao->port = htons(out_port); return buffer; } struct ofpbuf * make_unbuffered_packet_out(const struct ofpbuf *packet, uint16_t in_port, uint16_t out_port) { struct ofp_packet_out *opo; struct ofp_action_output *oao; size_t size = sizeof *opo + sizeof *oao; struct ofpbuf *out = ofpbuf_new(size + packet->size); opo = ofpbuf_put_zeros(out, size); opo->header.version = OFP_VERSION; opo->header.type = OFPT_PACKET_OUT; opo->buffer_id = htonl(UINT32_MAX); opo->in_port = htons(in_port); oao = (struct ofp_action_output *)&opo->actions[0]; oao->type = htons(OFPAT_OUTPUT); oao->len = htons(sizeof *oao); oao->port = htons(out_port); opo->actions_len = htons(sizeof *oao); ofpbuf_put(out, packet->data, packet->size); update_openflow_length(out); return out; } struct ofpbuf * make_buffered_packet_out(uint32_t buffer_id, uint16_t in_port, uint16_t out_port) { struct ofp_packet_out *opo; struct ofp_action_output *oao; size_t size = sizeof *opo + sizeof *oao; struct ofpbuf *out = ofpbuf_new(size); opo = ofpbuf_put_zeros(out, size); opo->header.version = OFP_VERSION; opo->header.type = OFPT_PACKET_OUT; opo->header.length = htons(size); opo->buffer_id = htonl(buffer_id); opo->in_port = htons(in_port); oao = (struct ofp_action_output *)&opo->actions[0]; oao->type = htons(OFPAT_OUTPUT); oao->len = htons(sizeof *oao); oao->port = htons(out_port); opo->actions_len = htons(sizeof *oao); return out; } /* Creates and returns an OFPT_ECHO_REQUEST message with an empty payload. */ struct ofpbuf * make_echo_request(void) { struct ofp_header *rq; struct ofpbuf *out = ofpbuf_new(sizeof *rq); rq = ofpbuf_put_uninit(out, sizeof *rq); rq->version = OFP_VERSION; rq->type = OFPT_ECHO_REQUEST; rq->length = htons(sizeof *rq); rq->xid = 0; return out; } /* Creates and returns an OFPT_ECHO_REPLY message matching the * OFPT_ECHO_REQUEST message in 'rq'. */ struct ofpbuf * make_echo_reply(const struct ofp_header *rq) { size_t size = ntohs(rq->length); struct ofpbuf *out = ofpbuf_new(size); struct ofp_header *reply = ofpbuf_put(out, rq, size); reply->type = OFPT_ECHO_REPLY; return out; } void vconn_init(struct vconn *vconn, struct vconn_class *class, int connect_status, uint32_t ip, const char *name) { vconn->class = class; vconn->state = (connect_status == EAGAIN ? VCS_CONNECTING : !connect_status ? VCS_SEND_HELLO : VCS_DISCONNECTED); vconn->error = connect_status; vconn->version = -1; vconn->min_version = -1; vconn->ip = ip; vconn->name = xstrdup(name); } void pvconn_init(struct pvconn *pvconn, struct pvconn_class *class, const char *name) { pvconn->class = class; pvconn->name = xstrdup(name); }