+/* 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 "datapath.h"
+#include <arpa/inet.h>
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include "chain.h"
+#include "csum.h"
+#include "flow.h"
+#include "list.h"
+#include "netdev.h"
+#include "ofpbuf.h"
+#include "openflow/openflow.h"
+#include "packets.h"
+#include "poll-loop.h"
+#include "rconn.h"
+#include "stp.h"
+#include "switch-flow.h"
+#include "table.h"
+#include "timeval.h"
+#include "vconn.h"
+#include "xtoxll.h"
+#include "dp_act.h"
+
+#define THIS_MODULE VLM_datapath
+#include "vlog.h"
+
+extern char mfr_desc;
+extern char hw_desc;
+extern char sw_desc;
+extern char serial_num;
+
+/* Capabilities supported by this implementation. */
+#define OFP_SUPPORTED_CAPABILITIES ( OFPC_FLOW_STATS \
+ | OFPC_TABLE_STATS \
+ | OFPC_PORT_STATS \
+ | OFPC_MULTI_PHY_TX )
+
+/* Actions supported by this implementation. */
+#define OFP_SUPPORTED_ACTIONS ( (1 << OFPAT_OUTPUT) \
+ | (1 << OFPAT_SET_VLAN_VID) \
+ | (1 << OFPAT_SET_VLAN_PCP) \
+ | (1 << OFPAT_STRIP_VLAN) \
+ | (1 << OFPAT_SET_DL_SRC) \
+ | (1 << OFPAT_SET_DL_DST) \
+ | (1 << OFPAT_SET_NW_SRC) \
+ | (1 << OFPAT_SET_NW_DST) \
+ | (1 << OFPAT_SET_TP_SRC) \
+ | (1 << OFPAT_SET_TP_DST) )
+
+struct sw_port {
+ uint32_t config; /* Some subset of OFPPC_* flags. */
+ uint32_t state; /* Some subset of OFPPS_* flags. */
+ struct datapath *dp;
+ struct netdev *netdev;
+ struct list node; /* Element in datapath.ports. */
+ unsigned long long int rx_packets, tx_packets;
+ unsigned long long int rx_bytes, tx_bytes;
+ unsigned long long int tx_dropped;
+ uint16_t port_no;
+};
+
+/* The origin of a received OpenFlow message, to enable sending a reply. */
+struct sender {
+ struct remote *remote; /* The device that sent the message. */
+ uint32_t xid; /* The OpenFlow transaction ID. */
+};
+
+/* A connection to a secure channel. */
+struct remote {
+ struct list node;
+ struct rconn *rconn;
+#define TXQ_LIMIT 128 /* Max number of packets to queue for tx. */
+ int n_txq; /* Number of packets queued for tx on rconn. */
+
+ /* Support for reliable, multi-message replies to requests.
+ *
+ * If an incoming request needs to have a reliable reply that might
+ * require multiple messages, it can use remote_start_dump() to set up
+ * a callback that will be called as buffer space for replies. */
+ int (*cb_dump)(struct datapath *, void *aux);
+ void (*cb_done)(void *aux);
+ void *cb_aux;
+};
+
+#define DP_MAX_PORTS 255
+BUILD_ASSERT_DECL(DP_MAX_PORTS <= OFPP_MAX);
+
+struct datapath {
+ /* Remote connections. */
+ struct list remotes; /* All connections (including controller). */
+
+ /* Listeners. */
+ struct pvconn **listeners;
+ size_t n_listeners;
+
+ time_t last_timeout;
+
+ /* Unique identifier for this datapath */
+ uint64_t id;
+
+ struct sw_chain *chain; /* Forwarding rules. */
+
+ /* Configuration set from controller. */
+ uint16_t flags;
+ uint16_t miss_send_len;
+
+ /* Switch ports. */
+ struct sw_port ports[DP_MAX_PORTS];
+ struct sw_port *local_port; /* OFPP_LOCAL port, if any. */
+ struct list port_list; /* All ports, including local_port. */
+};
+
+static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60);
+
+static struct remote *remote_create(struct datapath *, struct rconn *);
+static void remote_run(struct datapath *, struct remote *);
+static void remote_wait(struct remote *);
+static void remote_destroy(struct remote *);
+
+static void update_port_flags(struct datapath *, const struct ofp_port_mod *);
+static void send_flow_expired(struct datapath *, struct sw_flow *,
+ enum ofp_flow_expired_reason);
+static int update_port_status(struct sw_port *p);
+static void send_port_status(struct sw_port *p, uint8_t status);
+static void del_switch_port(struct sw_port *p);
+
+/* Buffers are identified by a 31-bit opaque ID. We divide the ID
+ * into a buffer number (low bits) and a cookie (high bits). The buffer number
+ * is an index into an array of buffers. The cookie distinguishes between
+ * different packets that have occupied a single buffer. Thus, the more
+ * buffers we have, the lower-quality the cookie... */
+#define PKT_BUFFER_BITS 8
+#define N_PKT_BUFFERS (1 << PKT_BUFFER_BITS)
+#define PKT_BUFFER_MASK (N_PKT_BUFFERS - 1)
+
+#define PKT_COOKIE_BITS (32 - PKT_BUFFER_BITS)
+
+int run_flow_through_tables(struct datapath *, struct ofpbuf *,
+ struct sw_port *);
+void fwd_port_input(struct datapath *, struct ofpbuf *, struct sw_port *);
+int fwd_control_input(struct datapath *, const struct sender *,
+ const void *, size_t);
+
+uint32_t save_buffer(struct ofpbuf *);
+static struct ofpbuf *retrieve_buffer(uint32_t id);
+static void discard_buffer(uint32_t id);
+
+static struct sw_port *
+lookup_port(struct datapath *dp, uint16_t port_no)
+{
+ return (port_no < DP_MAX_PORTS ? &dp->ports[port_no]
+ : port_no == OFPP_LOCAL ? dp->local_port
+ : NULL);
+}
+
+/* Generates and returns a random datapath id. */
+static uint64_t
+gen_datapath_id(void)
+{
+ uint8_t ea[ETH_ADDR_LEN];
+ eth_addr_random(ea);
+ ea[0] = 0x00; /* Set Nicira OUI. */
+ ea[1] = 0x23;
+ ea[2] = 0x20;
+ return eth_addr_to_uint64(ea);
+}
+
+int
+dp_new(struct datapath **dp_, uint64_t dpid)
+{
+ struct datapath *dp;
+
+ dp = calloc(1, sizeof *dp);
+ if (!dp) {
+ return ENOMEM;
+ }
+
+ dp->last_timeout = time_now();
+ list_init(&dp->remotes);
+ dp->listeners = NULL;
+ dp->n_listeners = 0;
+ dp->id = dpid <= UINT64_C(0xffffffffffff) ? dpid : gen_datapath_id();
+ dp->chain = chain_create();
+ if (!dp->chain) {
+ VLOG_ERR("could not create chain");
+ free(dp);
+ return ENOMEM;
+ }
+
+ list_init(&dp->port_list);
+ dp->flags = 0;
+ dp->miss_send_len = OFP_DEFAULT_MISS_SEND_LEN;
+ *dp_ = dp;
+ return 0;
+}
+
+static int
+new_port(struct datapath *dp, struct sw_port *port, uint16_t port_no,
+ const char *netdev_name, const uint8_t *new_mac)
+{
+ struct netdev *netdev;
+ struct in6_addr in6;
+ struct in_addr in4;
+ int error;
+
+ error = netdev_open(netdev_name, NETDEV_ETH_TYPE_ANY, &netdev);
+ if (error) {
+ return error;
+ }
+ if (new_mac && !eth_addr_equals(netdev_get_etheraddr(netdev), new_mac)) {
+ /* Generally the device has to be down before we change its hardware
+ * address. Don't bother to check for an error because it's really
+ * the netdev_set_etheraddr() call below that we care about. */
+ netdev_set_flags(netdev, 0, false);
+ error = netdev_set_etheraddr(netdev, new_mac);
+ if (error) {
+ VLOG_WARN("failed to change %s Ethernet address "
+ "to "ETH_ADDR_FMT": %s",
+ netdev_name, ETH_ADDR_ARGS(new_mac), strerror(error));
+ }
+ }
+ error = netdev_set_flags(netdev, NETDEV_UP | NETDEV_PROMISC, false);
+ if (error) {
+ VLOG_ERR("failed to set promiscuous mode on %s device", netdev_name);
+ netdev_close(netdev);
+ return error;
+ }
+ if (netdev_get_in4(netdev, &in4)) {
+ VLOG_ERR("%s device has assigned IP address %s",
+ netdev_name, inet_ntoa(in4));
+ }
+ if (netdev_get_in6(netdev, &in6)) {
+ char in6_name[INET6_ADDRSTRLEN + 1];
+ inet_ntop(AF_INET6, &in6, in6_name, sizeof in6_name);
+ VLOG_ERR("%s device has assigned IPv6 address %s",
+ netdev_name, in6_name);
+ }
+
+ memset(port, '\0', sizeof *port);
+
+ port->dp = dp;
+ port->netdev = netdev;
+ port->port_no = port_no;
+ list_push_back(&dp->port_list, &port->node);
+
+ /* Notify the ctlpath that this port has been added */
+ send_port_status(port, OFPPR_ADD);
+
+ return 0;
+}
+
+int
+dp_add_port(struct datapath *dp, const char *netdev)
+{
+ int port_no;
+ for (port_no = 0; port_no < DP_MAX_PORTS; port_no++) {
+ struct sw_port *port = &dp->ports[port_no];
+ if (!port->netdev) {
+ return new_port(dp, port, port_no, netdev, NULL);
+ }
+ }
+ return EXFULL;
+}
+
+int
+dp_add_local_port(struct datapath *dp, const char *netdev)
+{
+ if (!dp->local_port) {
+ uint8_t ea[ETH_ADDR_LEN];
+ struct sw_port *port;
+ int error;
+
+ port = xcalloc(1, sizeof *port);
+ eth_addr_from_uint64(dp->id, ea);
+ error = new_port(dp, port, OFPP_LOCAL, netdev, ea);
+ if (!error) {
+ dp->local_port = port;
+ } else {
+ free(port);
+ }
+ return error;
+ } else {
+ return EXFULL;
+ }
+}
+
+void
+dp_add_pvconn(struct datapath *dp, struct pvconn *pvconn)
+{
+ dp->listeners = xrealloc(dp->listeners,
+ sizeof *dp->listeners * (dp->n_listeners + 1));
+ dp->listeners[dp->n_listeners++] = pvconn;
+}
+
+void
+dp_run(struct datapath *dp)
+{
+ time_t now = time_now();
+ struct sw_port *p, *pn;
+ struct remote *r, *rn;
+ struct ofpbuf *buffer = NULL;
+ size_t i;
+
+ if (now != dp->last_timeout) {
+ struct list deleted = LIST_INITIALIZER(&deleted);
+ struct sw_flow *f, *n;
+
+ LIST_FOR_EACH (p, struct sw_port, node, &dp->port_list) {
+ if (update_port_status(p)) {
+ send_port_status(p, OFPPR_MODIFY);
+ }
+ }
+
+ chain_timeout(dp->chain, &deleted);
+ LIST_FOR_EACH_SAFE (f, n, struct sw_flow, node, &deleted) {
+ send_flow_expired(dp, f, f->reason);
+ list_remove(&f->node);
+ flow_free(f);
+ }
+ dp->last_timeout = now;
+ }
+ poll_timer_wait(1000);
+
+ LIST_FOR_EACH_SAFE (p, pn, struct sw_port, node, &dp->port_list) {
+ int error;
+
+ if (!buffer) {
+ /* Allocate buffer with some headroom to add headers in forwarding
+ * to the controller or adding a vlan tag, plus an extra 2 bytes to
+ * allow IP headers to be aligned on a 4-byte boundary. */
+ const int headroom = 128 + 2;
+ const int hard_header = VLAN_ETH_HEADER_LEN;
+ const int mtu = netdev_get_mtu(p->netdev);
+ buffer = ofpbuf_new(headroom + hard_header + mtu);
+ buffer->data = (char*)buffer->data + headroom;
+ }
+ error = netdev_recv(p->netdev, buffer);
+ if (!error) {
+ p->rx_packets++;
+ p->rx_bytes += buffer->size;
+ fwd_port_input(dp, buffer, p);
+ buffer = NULL;
+ } else if (error != EAGAIN) {
+ VLOG_ERR_RL(&rl, "error receiving data from %s: %s",
+ netdev_get_name(p->netdev), strerror(error));
+ }
+ }
+ ofpbuf_delete(buffer);
+
+ /* Talk to remotes. */
+ LIST_FOR_EACH_SAFE (r, rn, struct remote, node, &dp->remotes) {
+ remote_run(dp, r);
+ }
+
+ for (i = 0; i < dp->n_listeners; ) {
+ struct pvconn *pvconn = dp->listeners[i];
+ struct vconn *new_vconn;
+ int retval = pvconn_accept(pvconn, OFP_VERSION, &new_vconn);
+ if (!retval) {
+ remote_create(dp, rconn_new_from_vconn("passive", new_vconn));
+ } else if (retval != EAGAIN) {
+ VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval));
+ dp->listeners[i] = dp->listeners[--dp->n_listeners];
+ continue;
+ }
+ i++;
+ }
+}
+
+static void
+remote_run(struct datapath *dp, struct remote *r)
+{
+ int i;
+
+ rconn_run(r->rconn);
+
+ /* Do some remote processing, but cap it at a reasonable amount so that
+ * other processing doesn't starve. */
+ for (i = 0; i < 50; i++) {
+ if (!r->cb_dump) {
+ struct ofpbuf *buffer;
+ struct ofp_header *oh;
+
+ buffer = rconn_recv(r->rconn);
+ if (!buffer) {
+ break;
+ }
+
+ if (buffer->size >= sizeof *oh) {
+ struct sender sender;
+
+ oh = buffer->data;
+ sender.remote = r;
+ sender.xid = oh->xid;
+ fwd_control_input(dp, &sender, buffer->data, buffer->size);
+ } else {
+ VLOG_WARN_RL(&rl, "received too-short OpenFlow message");
+ }
+ ofpbuf_delete(buffer);
+ } else {
+ if (r->n_txq < TXQ_LIMIT) {
+ int error = r->cb_dump(dp, r->cb_aux);
+ if (error <= 0) {
+ if (error) {
+ VLOG_WARN_RL(&rl, "dump callback error: %s",
+ strerror(-error));
+ }
+ r->cb_done(r->cb_aux);
+ r->cb_dump = NULL;
+ }
+ } else {
+ break;
+ }
+ }
+ }
+
+ if (!rconn_is_alive(r->rconn)) {
+ remote_destroy(r);
+ }
+}
+
+static void
+remote_wait(struct remote *r)
+{
+ rconn_run_wait(r->rconn);
+ rconn_recv_wait(r->rconn);
+}
+
+static void
+remote_destroy(struct remote *r)
+{
+ if (r) {
+ if (r->cb_dump && r->cb_done) {
+ r->cb_done(r->cb_aux);
+ }
+ list_remove(&r->node);
+ rconn_destroy(r->rconn);
+ free(r);
+ }
+}
+
+static struct remote *
+remote_create(struct datapath *dp, struct rconn *rconn)
+{
+ struct remote *remote = xmalloc(sizeof *remote);
+ list_push_back(&dp->remotes, &remote->node);
+ remote->rconn = rconn;
+ remote->cb_dump = NULL;
+ remote->n_txq = 0;
+ return remote;
+}
+
+/* Starts a callback-based, reliable, possibly multi-message reply to a
+ * request made by 'remote'.
+ *
+ * 'dump' designates a function that will be called when the 'remote' send
+ * queue has an empty slot. It should compose a message and send it on
+ * 'remote'. On success, it should return 1 if it should be called again when
+ * another send queue slot opens up, 0 if its transmissions are complete, or a
+ * negative errno value on failure.
+ *
+ * 'done' designates a function to clean up any resources allocated for the
+ * dump. It must handle being called before the dump is complete (which will
+ * happen if 'remote' is closed unexpectedly).
+ *
+ * 'aux' is passed to 'dump' and 'done'. */
+static void
+remote_start_dump(struct remote *remote,
+ int (*dump)(struct datapath *, void *),
+ void (*done)(void *),
+ void *aux)
+{
+ assert(!remote->cb_dump);
+ remote->cb_dump = dump;
+ remote->cb_done = done;
+ remote->cb_aux = aux;
+}
+
+void
+dp_wait(struct datapath *dp)
+{
+ struct sw_port *p;
+ struct remote *r;
+ size_t i;
+
+ LIST_FOR_EACH (p, struct sw_port, node, &dp->port_list) {
+ netdev_recv_wait(p->netdev);
+ }
+ LIST_FOR_EACH (r, struct remote, node, &dp->remotes) {
+ remote_wait(r);
+ }
+ for (i = 0; i < dp->n_listeners; i++) {
+ pvconn_wait(dp->listeners[i]);
+ }
+}
+
+/* Delete 'p' from switch. */
+static void
+del_switch_port(struct sw_port *p)
+{
+ send_port_status(p, OFPPR_DELETE);
+ netdev_close(p->netdev);
+ p->netdev = NULL;
+ list_remove(&p->node);
+}
+
+void
+dp_destroy(struct datapath *dp)
+{
+ struct sw_port *p, *n;
+
+ if (!dp) {
+ return;
+ }
+
+ LIST_FOR_EACH_SAFE (p, n, struct sw_port, node, &dp->port_list) {
+ del_switch_port(p);
+ }
+ chain_destroy(dp->chain);
+ free(dp);
+}
+
+/* Send packets out all the ports except the originating one. If the
+ * "flood" argument is set, don't send out ports with flooding disabled.
+ */
+static int
+output_all(struct datapath *dp, struct ofpbuf *buffer, int in_port, int flood)
+{
+ struct sw_port *p;
+ int prev_port;
+
+ prev_port = -1;
+ LIST_FOR_EACH (p, struct sw_port, node, &dp->port_list) {
+ if (p->port_no == in_port) {
+ continue;
+ }
+ if (flood && p->config & OFPPC_NO_FLOOD) {
+ continue;
+ }
+ if (prev_port != -1) {
+ dp_output_port(dp, ofpbuf_clone(buffer), in_port, prev_port,
+ false);
+ }
+ prev_port = p->port_no;
+ }
+ if (prev_port != -1)
+ dp_output_port(dp, buffer, in_port, prev_port, false);
+ else
+ ofpbuf_delete(buffer);
+
+ return 0;
+}
+
+void
+output_packet(struct datapath *dp, struct ofpbuf *buffer, uint16_t out_port)
+{
+ struct sw_port *p = lookup_port(dp, out_port);
+ if (p && p->netdev != NULL) {
+ if (!(p->config & OFPPC_PORT_DOWN)) {
+ if (!netdev_send(p->netdev, buffer)) {
+ p->tx_packets++;
+ p->tx_bytes += buffer->size;
+ } else {
+ p->tx_dropped++;
+ }
+ }
+ ofpbuf_delete(buffer);
+ return;
+ }
+
+ ofpbuf_delete(buffer);
+ VLOG_DBG_RL(&rl, "can't forward to bad port %d\n", out_port);
+}
+
+/* Takes ownership of 'buffer' and transmits it to 'out_port' on 'dp'.
+ */
+void
+dp_output_port(struct datapath *dp, struct ofpbuf *buffer,
+ int in_port, int out_port, bool ignore_no_fwd)
+{
+
+ assert(buffer);
+ switch (out_port) {
+ case OFPP_IN_PORT:
+ output_packet(dp, buffer, in_port);
+ break;
+
+ case OFPP_TABLE: {
+ struct sw_port *p = lookup_port(dp, in_port);
+ if (run_flow_through_tables(dp, buffer, p)) {
+ ofpbuf_delete(buffer);
+ }
+ break;
+ }
+
+ case OFPP_FLOOD:
+ output_all(dp, buffer, in_port, 1);
+ break;
+
+ case OFPP_ALL:
+ output_all(dp, buffer, in_port, 0);
+ break;
+
+ case OFPP_CONTROLLER:
+ dp_output_control(dp, buffer, in_port, 0, OFPR_ACTION);
+ break;
+
+ case OFPP_LOCAL:
+ default:
+ if (in_port == out_port) {
+ VLOG_DBG_RL(&rl, "can't directly forward to input port");
+ return;
+ }
+ output_packet(dp, buffer, out_port);
+ break;
+ }
+}
+
+static void *
+make_openflow_reply(size_t openflow_len, uint8_t type,
+ const struct sender *sender, struct ofpbuf **bufferp)
+{
+ return make_openflow_xid(openflow_len, type, sender ? sender->xid : 0,
+ bufferp);
+}
+
+static int
+send_openflow_buffer_to_remote(struct ofpbuf *buffer, struct remote *remote)
+{
+ int retval = rconn_send_with_limit(remote->rconn, buffer, &remote->n_txq,
+ TXQ_LIMIT);
+ if (retval) {
+ VLOG_WARN_RL(&rl, "send to %s failed: %s",
+ rconn_get_name(remote->rconn), strerror(retval));
+ }
+ return retval;
+}
+
+static int
+send_openflow_buffer(struct datapath *dp, struct ofpbuf *buffer,
+ const struct sender *sender)
+{
+ update_openflow_length(buffer);
+ if (sender) {
+ /* Send back to the sender. */
+ return send_openflow_buffer_to_remote(buffer, sender->remote);
+ } else {
+ /* Broadcast to all remotes. */
+ struct remote *r, *prev = NULL;
+ LIST_FOR_EACH (r, struct remote, node, &dp->remotes) {
+ if (prev) {
+ send_openflow_buffer_to_remote(ofpbuf_clone(buffer), prev);
+ }
+ prev = r;
+ }
+ if (prev) {
+ send_openflow_buffer_to_remote(buffer, prev);
+ } else {
+ ofpbuf_delete(buffer);
+ }
+ return 0;
+ }
+}
+
+/* Takes ownership of 'buffer' and transmits it to 'dp''s controller. If the
+ * packet can be saved in a buffer, then only the first max_len bytes of
+ * 'buffer' are sent; otherwise, all of 'buffer' is sent. 'reason' indicates
+ * why 'buffer' is being sent. 'max_len' sets the maximum number of bytes that
+ * the caller wants to be sent; a value of 0 indicates the entire packet should
+ * be sent. */
+void
+dp_output_control(struct datapath *dp, struct ofpbuf *buffer, int in_port,
+ size_t max_len, int reason)
+{
+ struct ofp_packet_in *opi;
+ size_t total_len;
+ uint32_t buffer_id;
+
+ buffer_id = save_buffer(buffer);
+ total_len = buffer->size;
+ if (buffer_id != UINT32_MAX && max_len && buffer->size > max_len) {
+ buffer->size = max_len;
+ }
+
+ opi = ofpbuf_push_uninit(buffer, offsetof(struct ofp_packet_in, data));
+ opi->header.version = OFP_VERSION;
+ opi->header.type = OFPT_PACKET_IN;
+ opi->header.length = htons(buffer->size);
+ opi->header.xid = htonl(0);
+ opi->buffer_id = htonl(buffer_id);
+ opi->total_len = htons(total_len);
+ opi->in_port = htons(in_port);
+ opi->reason = reason;
+ opi->pad = 0;
+ send_openflow_buffer(dp, buffer, NULL);
+}
+
+static void fill_port_desc(struct datapath *dp, struct sw_port *p,
+ struct ofp_phy_port *desc)
+{
+ desc->port_no = htons(p->port_no);
+ strncpy((char *) desc->name, netdev_get_name(p->netdev),
+ sizeof desc->name);
+ desc->name[sizeof desc->name - 1] = '\0';
+ memcpy(desc->hw_addr, netdev_get_etheraddr(p->netdev), ETH_ADDR_LEN);
+ desc->config = htonl(p->config);
+ desc->state = htonl(p->state);
+ desc->curr = htonl(netdev_get_features(p->netdev, NETDEV_FEAT_CURRENT));
+ desc->supported = htonl(netdev_get_features(p->netdev,
+ NETDEV_FEAT_SUPPORTED));
+ desc->advertised = htonl(netdev_get_features(p->netdev,
+ NETDEV_FEAT_ADVERTISED));
+ desc->peer = htonl(netdev_get_features(p->netdev, NETDEV_FEAT_PEER));
+}
+
+static void
+dp_send_features_reply(struct datapath *dp, const struct sender *sender)
+{
+ struct ofpbuf *buffer;
+ struct ofp_switch_features *ofr;
+ struct sw_port *p;
+
+ ofr = make_openflow_reply(sizeof *ofr, OFPT_FEATURES_REPLY,
+ sender, &buffer);
+ ofr->datapath_id = htonll(dp->id);
+ ofr->n_tables = dp->chain->n_tables;
+ ofr->n_buffers = htonl(N_PKT_BUFFERS);
+ ofr->capabilities = htonl(OFP_SUPPORTED_CAPABILITIES);
+ ofr->actions = htonl(OFP_SUPPORTED_ACTIONS);
+ LIST_FOR_EACH (p, struct sw_port, node, &dp->port_list) {
+ struct ofp_phy_port *opp = ofpbuf_put_uninit(buffer, sizeof *opp);
+ memset(opp, 0, sizeof *opp);
+ fill_port_desc(dp, p, opp);
+ }
+ send_openflow_buffer(dp, buffer, sender);
+}
+
+void
+update_port_flags(struct datapath *dp, const struct ofp_port_mod *opm)
+{
+ struct sw_port *p = lookup_port(dp, ntohs(opm->port_no));
+
+ /* Make sure the port id hasn't changed since this was sent */
+ if (!p || memcmp(opm->hw_addr, netdev_get_etheraddr(p->netdev),
+ ETH_ADDR_LEN) != 0) {
+ return;
+ }
+
+
+ if (opm->mask) {
+ uint32_t config_mask = ntohl(opm->mask);
+ p->config &= ~config_mask;
+ p->config |= ntohl(opm->config) & config_mask;
+ }
+
+ if (opm->mask & htonl(OFPPC_PORT_DOWN)) {
+ if ((opm->config & htonl(OFPPC_PORT_DOWN))
+ && (p->config & OFPPC_PORT_DOWN) == 0) {
+ p->config |= OFPPC_PORT_DOWN;
+ netdev_turn_flags_off(p->netdev, NETDEV_UP, true);
+ } else if ((opm->config & htonl(OFPPC_PORT_DOWN)) == 0
+ && (p->config & OFPPC_PORT_DOWN)) {
+ p->config &= ~OFPPC_PORT_DOWN;
+ netdev_turn_flags_on(p->netdev, NETDEV_UP, true);
+ }
+ }
+}
+
+/* Update the port status field of the bridge port. A non-zero return
+ * value indicates some field has changed.
+ *
+ * NB: Callers of this function may hold the RCU read lock, so any
+ * additional checks must not sleep.
+ */
+static int
+update_port_status(struct sw_port *p)
+{
+ int retval;
+ enum netdev_flags flags;
+ uint32_t orig_config = p->config;
+ uint32_t orig_state = p->state;
+
+ if (netdev_get_flags(p->netdev, &flags) < 0) {
+ VLOG_WARN_RL(&rl, "could not get netdev flags for %s",
+ netdev_get_name(p->netdev));
+ return 0;
+ } else {
+ if (flags & NETDEV_UP) {
+ p->config &= ~OFPPC_PORT_DOWN;
+ } else {
+ p->config |= OFPPC_PORT_DOWN;
+ }
+ }
+
+ /* Not all cards support this getting link status, so don't warn on
+ * error. */
+ retval = netdev_get_link_status(p->netdev);
+ if (retval == 1) {
+ p->state &= ~OFPPS_LINK_DOWN;
+ } else if (retval == 0) {
+ p->state |= OFPPS_LINK_DOWN;
+ }
+
+ return ((orig_config != p->config) || (orig_state != p->state));
+}
+
+static void
+send_port_status(struct sw_port *p, uint8_t status)
+{
+ struct ofpbuf *buffer;
+ struct ofp_port_status *ops;
+ ops = make_openflow_xid(sizeof *ops, OFPT_PORT_STATUS, 0, &buffer);
+ ops->reason = status;
+ memset(ops->pad, 0, sizeof ops->pad);
+ fill_port_desc(p->dp, p, &ops->desc);
+
+ send_openflow_buffer(p->dp, buffer, NULL);
+}
+
+void
+send_flow_expired(struct datapath *dp, struct sw_flow *flow,
+ enum ofp_flow_expired_reason reason)
+{
+ struct ofpbuf *buffer;
+ struct ofp_flow_expired *ofe;
+ ofe = make_openflow_xid(sizeof *ofe, OFPT_FLOW_EXPIRED, 0, &buffer);
+ flow_fill_match(&ofe->match, &flow->key);
+
+ ofe->priority = htons(flow->priority);
+ ofe->reason = reason;
+ memset(ofe->pad, 0, sizeof ofe->pad);
+
+ ofe->duration = htonl(time_now() - flow->created);
+ memset(ofe->pad2, 0, sizeof ofe->pad2);
+ ofe->packet_count = htonll(flow->packet_count);
+ ofe->byte_count = htonll(flow->byte_count);
+ send_openflow_buffer(dp, buffer, NULL);
+}
+
+void
+dp_send_error_msg(struct datapath *dp, const struct sender *sender,
+ uint16_t type, uint16_t code, const void *data, size_t len)
+{
+ struct ofpbuf *buffer;
+ struct ofp_error_msg *oem;
+ oem = make_openflow_reply(sizeof(*oem)+len, OFPT_ERROR, sender, &buffer);
+ oem->type = htons(type);
+ oem->code = htons(code);
+ memcpy(oem->data, data, len);
+ send_openflow_buffer(dp, buffer, sender);
+}
+
+static void
+fill_flow_stats(struct ofpbuf *buffer, struct sw_flow *flow,
+ int table_idx, time_t now)
+{
+ struct ofp_flow_stats *ofs;
+ int length = sizeof *ofs + flow->sf_acts->actions_len;
+ ofs = ofpbuf_put_uninit(buffer, length);
+ ofs->length = htons(length);
+ ofs->table_id = table_idx;
+ ofs->pad = 0;
+ ofs->match.wildcards = htonl(flow->key.wildcards);
+ ofs->match.in_port = flow->key.flow.in_port;
+ memcpy(ofs->match.dl_src, flow->key.flow.dl_src, ETH_ADDR_LEN);
+ memcpy(ofs->match.dl_dst, flow->key.flow.dl_dst, ETH_ADDR_LEN);
+ ofs->match.dl_vlan = flow->key.flow.dl_vlan;
+ ofs->match.dl_type = flow->key.flow.dl_type;
+ ofs->match.nw_src = flow->key.flow.nw_src;
+ ofs->match.nw_dst = flow->key.flow.nw_dst;
+ ofs->match.nw_proto = flow->key.flow.nw_proto;
+ ofs->match.pad = 0;
+ ofs->match.tp_src = flow->key.flow.tp_src;
+ ofs->match.tp_dst = flow->key.flow.tp_dst;
+ ofs->duration = htonl(now - flow->created);
+ ofs->priority = htons(flow->priority);
+ ofs->idle_timeout = htons(flow->idle_timeout);
+ ofs->hard_timeout = htons(flow->hard_timeout);
+ memset(ofs->pad2, 0, sizeof ofs->pad2);
+ ofs->packet_count = htonll(flow->packet_count);
+ ofs->byte_count = htonll(flow->byte_count);
+ memcpy(ofs->actions, flow->sf_acts->actions, flow->sf_acts->actions_len);
+}
+
+\f
+/* 'buffer' was received on 'p', which may be a a physical switch port or a
+ * null pointer. Process it according to 'dp''s flow table. Returns 0 if
+ * successful, in which case 'buffer' is destroyed, or -ESRCH if there is no
+ * matching flow, in which case 'buffer' still belongs to the caller. */
+int run_flow_through_tables(struct datapath *dp, struct ofpbuf *buffer,
+ struct sw_port *p)
+{
+ struct sw_flow_key key;
+ struct sw_flow *flow;
+
+ key.wildcards = 0;
+ if (flow_extract(buffer, p ? p->port_no : OFPP_NONE, &key.flow)
+ && (dp->flags & OFPC_FRAG_MASK) == OFPC_FRAG_DROP) {
+ /* Drop fragment. */
+ ofpbuf_delete(buffer);
+ return 0;
+ }
+ if (p && p->config & (OFPPC_NO_RECV | OFPPC_NO_RECV_STP)
+ && p->config & (!eth_addr_equals(key.flow.dl_dst, stp_eth_addr)
+ ? OFPPC_NO_RECV : OFPPC_NO_RECV_STP)) {
+ ofpbuf_delete(buffer);
+ return 0;
+ }
+
+ flow = chain_lookup(dp->chain, &key);
+ if (flow != NULL) {
+ flow_used(flow, buffer);
+ execute_actions(dp, buffer, &key, flow->sf_acts->actions,
+ flow->sf_acts->actions_len, false);
+ return 0;
+ } else {
+ return -ESRCH;
+ }
+}
+
+/* 'buffer' was received on 'p', which may be a a physical switch port or a
+ * null pointer. Process it according to 'dp''s flow table, sending it up to
+ * the controller if no flow matches. Takes ownership of 'buffer'. */
+void fwd_port_input(struct datapath *dp, struct ofpbuf *buffer,
+ struct sw_port *p)
+{
+ if (run_flow_through_tables(dp, buffer, p)) {
+ dp_output_control(dp, buffer, p->port_no,
+ dp->miss_send_len, OFPR_NO_MATCH);
+ }
+}
+
+static int
+recv_features_request(struct datapath *dp, const struct sender *sender,
+ const void *msg)
+{
+ dp_send_features_reply(dp, sender);
+ return 0;
+}
+
+static int
+recv_get_config_request(struct datapath *dp, const struct sender *sender,
+ const void *msg)
+{
+ struct ofpbuf *buffer;
+ struct ofp_switch_config *osc;
+
+ osc = make_openflow_reply(sizeof *osc, OFPT_GET_CONFIG_REPLY,
+ sender, &buffer);
+
+ osc->flags = htons(dp->flags);
+ osc->miss_send_len = htons(dp->miss_send_len);
+
+ return send_openflow_buffer(dp, buffer, sender);
+}
+
+static int
+recv_set_config(struct datapath *dp, const struct sender *sender UNUSED,
+ const void *msg)
+{
+ const struct ofp_switch_config *osc = msg;
+ int flags;
+
+ flags = ntohs(osc->flags) & (OFPC_SEND_FLOW_EXP | OFPC_FRAG_MASK);
+ if ((flags & OFPC_FRAG_MASK) != OFPC_FRAG_NORMAL
+ && (flags & OFPC_FRAG_MASK) != OFPC_FRAG_DROP) {
+ flags = (flags & ~OFPC_FRAG_MASK) | OFPC_FRAG_DROP;
+ }
+ dp->flags = flags;
+ dp->miss_send_len = ntohs(osc->miss_send_len);
+ return 0;
+}
+
+static int
+recv_packet_out(struct datapath *dp, const struct sender *sender,
+ const void *msg)
+{
+ const struct ofp_packet_out *opo = msg;
+ struct sw_flow_key key;
+ uint16_t v_code;
+ struct ofpbuf *buffer;
+ size_t actions_len = ntohs(opo->actions_len);
+
+ if (actions_len > (ntohs(opo->header.length) - sizeof *opo)) {
+ VLOG_DBG_RL(&rl, "message too short for number of actions");
+ return -EINVAL;
+ }
+
+ if (ntohl(opo->buffer_id) == (uint32_t) -1) {
+ /* FIXME: can we avoid copying data here? */
+ int data_len = ntohs(opo->header.length) - sizeof *opo - actions_len;
+ buffer = ofpbuf_new(data_len);
+ ofpbuf_put(buffer, (uint8_t *)opo->actions + actions_len, data_len);
+ } else {
+ buffer = retrieve_buffer(ntohl(opo->buffer_id));
+ if (!buffer) {
+ return -ESRCH;
+ }
+ }
+
+ flow_extract(buffer, ntohs(opo->in_port), &key.flow);
+
+ v_code = validate_actions(dp, &key, opo->actions, actions_len);
+ if (v_code != ACT_VALIDATION_OK) {
+ dp_send_error_msg(dp, sender, OFPET_BAD_ACTION, v_code,
+ msg, ntohs(opo->header.length));
+ goto error;
+ }
+
+ execute_actions(dp, buffer, &key, opo->actions, actions_len, true);
+
+ return 0;
+
+error:
+ ofpbuf_delete(buffer);
+ return -EINVAL;
+}
+
+static int
+recv_port_mod(struct datapath *dp, const struct sender *sender UNUSED,
+ const void *msg)
+{
+ const struct ofp_port_mod *opm = msg;
+
+ update_port_flags(dp, opm);
+
+ return 0;
+}
+
+static int
+add_flow(struct datapath *dp, const struct sender *sender,
+ const struct ofp_flow_mod *ofm)
+{
+ int error = -ENOMEM;
+ uint16_t v_code;
+ struct sw_flow *flow;
+ size_t actions_len = ntohs(ofm->header.length) - sizeof *ofm;
+
+ /* Allocate memory. */
+ flow = flow_alloc(actions_len);
+ if (flow == NULL)
+ goto error;
+
+ flow_extract_match(&flow->key, &ofm->match);
+
+ v_code = validate_actions(dp, &flow->key, ofm->actions, actions_len);
+ if (v_code != ACT_VALIDATION_OK) {
+ dp_send_error_msg(dp, sender, OFPET_BAD_ACTION, v_code,
+ ofm, ntohs(ofm->header.length));
+ goto error_free_flow;
+ }
+
+ /* Fill out flow. */
+ flow->priority = flow->key.wildcards ? ntohs(ofm->priority) : -1;
+ flow->idle_timeout = ntohs(ofm->idle_timeout);
+ flow->hard_timeout = ntohs(ofm->hard_timeout);
+ flow->used = flow->created = time_now();
+ flow->sf_acts->actions_len = actions_len;
+ flow->byte_count = 0;
+ flow->packet_count = 0;
+ memcpy(flow->sf_acts->actions, ofm->actions, actions_len);
+
+ /* Act. */
+ error = chain_insert(dp->chain, flow);
+ if (error == -ENOBUFS) {
+ dp_send_error_msg(dp, sender, OFPET_FLOW_MOD_FAILED,
+ OFPFMFC_ALL_TABLES_FULL, ofm, ntohs(ofm->header.length));
+ goto error_free_flow;
+ } else if (error) {
+ goto error_free_flow;
+ }
+ error = 0;
+ if (ntohl(ofm->buffer_id) != UINT32_MAX) {
+ struct ofpbuf *buffer = retrieve_buffer(ntohl(ofm->buffer_id));
+ if (buffer) {
+ struct sw_flow_key key;
+ uint16_t in_port = ntohs(ofm->match.in_port);
+ flow_used(flow, buffer);
+ flow_extract(buffer, in_port, &key.flow);
+ execute_actions(dp, buffer, &key,
+ ofm->actions, actions_len, false);
+ } else {
+ error = -ESRCH;
+ }
+ }
+ return error;
+
+error_free_flow:
+ flow_free(flow);
+error:
+ if (ntohl(ofm->buffer_id) != (uint32_t) -1)
+ discard_buffer(ntohl(ofm->buffer_id));
+ return error;
+}
+
+static int
+mod_flow(struct datapath *dp, const struct sender *sender,
+ const struct ofp_flow_mod *ofm)
+{
+ int error = -ENOMEM;
+ uint16_t v_code;
+ size_t actions_len;
+ struct sw_flow_key key;
+ uint16_t priority;
+ int strict;
+
+ flow_extract_match(&key, &ofm->match);
+
+ actions_len = ntohs(ofm->header.length) - sizeof *ofm;
+
+ v_code = validate_actions(dp, &key, ofm->actions, actions_len);
+ if (v_code != ACT_VALIDATION_OK) {
+ dp_send_error_msg(dp, sender, OFPET_BAD_ACTION, v_code,
+ ofm, ntohs(ofm->header.length));
+ goto error;
+ }
+
+ priority = key.wildcards ? ntohs(ofm->priority) : -1;
+ strict = (ofm->command == htons(OFPFC_MODIFY_STRICT)) ? 1 : 0;
+ chain_modify(dp->chain, &key, priority, strict, ofm->actions, actions_len);
+
+ if (ntohl(ofm->buffer_id) != UINT32_MAX) {
+ struct ofpbuf *buffer = retrieve_buffer(ntohl(ofm->buffer_id));
+ if (buffer) {
+ struct sw_flow_key skb_key;
+ uint16_t in_port = ntohs(ofm->match.in_port);
+ flow_extract(buffer, in_port, &skb_key.flow);
+ execute_actions(dp, buffer, &skb_key,
+ ofm->actions, actions_len, false);
+ } else {
+ error = -ESRCH;
+ }
+ }
+ return error;
+
+error:
+ if (ntohl(ofm->buffer_id) != (uint32_t) -1)
+ discard_buffer(ntohl(ofm->buffer_id));
+ return error;
+}
+
+static int
+recv_flow(struct datapath *dp, const struct sender *sender,
+ const void *msg)
+{
+ const struct ofp_flow_mod *ofm = msg;
+ uint16_t command = ntohs(ofm->command);
+
+ if (command == OFPFC_ADD) {
+ return add_flow(dp, sender, ofm);
+ } else if ((command == OFPFC_MODIFY) || (command == OFPFC_MODIFY_STRICT)) {
+ return mod_flow(dp, sender, ofm);
+ } else if (command == OFPFC_DELETE) {
+ struct sw_flow_key key;
+ flow_extract_match(&key, &ofm->match);
+ return chain_delete(dp->chain, &key, ofm->out_port, 0, 0) ? 0 : -ESRCH;
+ } else if (command == OFPFC_DELETE_STRICT) {
+ struct sw_flow_key key;
+ uint16_t priority;
+ flow_extract_match(&key, &ofm->match);
+ priority = key.wildcards ? ntohs(ofm->priority) : -1;
+ return chain_delete(dp->chain, &key, ofm->out_port,
+ priority, 1) ? 0 : -ESRCH;
+ } else {
+ return -ENODEV;
+ }
+}
+
+static int desc_stats_dump(struct datapath *dp, void *state,
+ struct ofpbuf *buffer)
+{
+ struct ofp_desc_stats *ods = ofpbuf_put_uninit(buffer, sizeof *ods);
+
+ strncpy(ods->mfr_desc, &mfr_desc, sizeof ods->mfr_desc);
+ strncpy(ods->hw_desc, &hw_desc, sizeof ods->hw_desc);
+ strncpy(ods->sw_desc, &sw_desc, sizeof ods->sw_desc);
+ strncpy(ods->serial_num, &serial_num, sizeof ods->serial_num);
+
+ return 0;
+}
+
+struct flow_stats_state {
+ int table_idx;
+ struct sw_table_position position;
+ struct ofp_flow_stats_request rq;
+ time_t now;
+
+ struct ofpbuf *buffer;
+};
+
+#define MAX_FLOW_STATS_BYTES 4096
+
+static int flow_stats_init(struct datapath *dp, const void *body, int body_len,
+ void **state)
+{
+ const struct ofp_flow_stats_request *fsr = body;
+ struct flow_stats_state *s = xmalloc(sizeof *s);
+ s->table_idx = fsr->table_id == 0xff ? 0 : fsr->table_id;
+ memset(&s->position, 0, sizeof s->position);
+ s->rq = *fsr;
+ *state = s;
+ return 0;
+}
+
+static int flow_stats_dump_callback(struct sw_flow *flow, void *private)
+{
+ struct flow_stats_state *s = private;
+ fill_flow_stats(s->buffer, flow, s->table_idx, s->now);
+ return s->buffer->size >= MAX_FLOW_STATS_BYTES;
+}
+
+static int flow_stats_dump(struct datapath *dp, void *state,
+ struct ofpbuf *buffer)
+{
+ struct flow_stats_state *s = state;
+ struct sw_flow_key match_key;
+
+ flow_extract_match(&match_key, &s->rq.match);
+ s->buffer = buffer;
+ s->now = time_now();
+ while (s->table_idx < dp->chain->n_tables
+ && (s->rq.table_id == 0xff || s->rq.table_id == s->table_idx))
+ {
+ struct sw_table *table = dp->chain->tables[s->table_idx];
+
+ if (table->iterate(table, &match_key, s->rq.out_port,
+ &s->position, flow_stats_dump_callback, s))
+ break;
+
+ s->table_idx++;
+ memset(&s->position, 0, sizeof s->position);
+ }
+ return s->buffer->size >= MAX_FLOW_STATS_BYTES;
+}
+
+static void flow_stats_done(void *state)
+{
+ free(state);
+}
+
+struct aggregate_stats_state {
+ struct ofp_aggregate_stats_request rq;
+};
+
+static int aggregate_stats_init(struct datapath *dp,
+ const void *body, int body_len,
+ void **state)
+{
+ const struct ofp_aggregate_stats_request *rq = body;
+ struct aggregate_stats_state *s = xmalloc(sizeof *s);
+ s->rq = *rq;
+ *state = s;
+ return 0;
+}
+
+static int aggregate_stats_dump_callback(struct sw_flow *flow, void *private)
+{
+ struct ofp_aggregate_stats_reply *rpy = private;
+ rpy->packet_count += flow->packet_count;
+ rpy->byte_count += flow->byte_count;
+ rpy->flow_count++;
+ return 0;
+}
+
+static int aggregate_stats_dump(struct datapath *dp, void *state,
+ struct ofpbuf *buffer)
+{
+ struct aggregate_stats_state *s = state;
+ struct ofp_aggregate_stats_request *rq = &s->rq;
+ struct ofp_aggregate_stats_reply *rpy;
+ struct sw_table_position position;
+ struct sw_flow_key match_key;
+ int table_idx;
+
+ rpy = ofpbuf_put_uninit(buffer, sizeof *rpy);
+ memset(rpy, 0, sizeof *rpy);
+
+ flow_extract_match(&match_key, &rq->match);
+ table_idx = rq->table_id == 0xff ? 0 : rq->table_id;
+ memset(&position, 0, sizeof position);
+ while (table_idx < dp->chain->n_tables
+ && (rq->table_id == 0xff || rq->table_id == table_idx))
+ {
+ struct sw_table *table = dp->chain->tables[table_idx];
+ int error;
+
+ error = table->iterate(table, &match_key, rq->out_port, &position,
+ aggregate_stats_dump_callback, rpy);
+ if (error)
+ return error;
+
+ table_idx++;
+ memset(&position, 0, sizeof position);
+ }
+
+ rpy->packet_count = htonll(rpy->packet_count);
+ rpy->byte_count = htonll(rpy->byte_count);
+ rpy->flow_count = htonl(rpy->flow_count);
+ return 0;
+}
+
+static void aggregate_stats_done(void *state)
+{
+ free(state);
+}
+
+static int table_stats_dump(struct datapath *dp, void *state,
+ struct ofpbuf *buffer)
+{
+ int i;
+ for (i = 0; i < dp->chain->n_tables; i++) {
+ struct ofp_table_stats *ots = ofpbuf_put_uninit(buffer, sizeof *ots);
+ struct sw_table_stats stats;
+ dp->chain->tables[i]->stats(dp->chain->tables[i], &stats);
+ strncpy(ots->name, stats.name, sizeof ots->name);
+ ots->table_id = i;
+ ots->wildcards = htonl(stats.wildcards);
+ memset(ots->pad, 0, sizeof ots->pad);
+ ots->max_entries = htonl(stats.max_flows);
+ ots->active_count = htonl(stats.n_flows);
+ ots->lookup_count = htonll(stats.n_lookup);
+ ots->matched_count = htonll(stats.n_matched);
+ }
+ return 0;
+}
+
+struct port_stats_state {
+ int port;
+};
+
+static int port_stats_init(struct datapath *dp, const void *body, int body_len,
+ void **state)
+{
+ struct port_stats_state *s = xmalloc(sizeof *s);
+ s->port = 0;
+ *state = s;
+ return 0;
+}
+
+static void
+dump_port_stats(struct sw_port *port, struct ofpbuf *buffer)
+{
+ struct ofp_port_stats *ops = ofpbuf_put_uninit(buffer, sizeof *ops);
+ ops->port_no = htons(port->port_no);
+ memset(ops->pad, 0, sizeof ops->pad);
+ ops->rx_packets = htonll(port->rx_packets);
+ ops->tx_packets = htonll(port->tx_packets);
+ ops->rx_bytes = htonll(port->rx_bytes);
+ ops->tx_bytes = htonll(port->tx_bytes);
+ ops->rx_dropped = htonll(-1);
+ ops->tx_dropped = htonll(port->tx_dropped);
+ ops->rx_errors = htonll(-1);
+ ops->tx_errors = htonll(-1);
+ ops->rx_frame_err = htonll(-1);
+ ops->rx_over_err = htonll(-1);
+ ops->rx_crc_err = htonll(-1);
+ ops->collisions = htonll(-1);
+}
+
+static int port_stats_dump(struct datapath *dp, void *state,
+ struct ofpbuf *buffer)
+{
+ struct port_stats_state *s = state;
+ int i;
+
+ for (i = s->port; i < DP_MAX_PORTS; i++) {
+ struct sw_port *p = &dp->ports[i];
+ if (p->netdev) {
+ dump_port_stats(p, buffer);
+ }
+ }
+ s->port = i;
+
+ if (dp->local_port) {
+ dump_port_stats(dp->local_port, buffer);
+ s->port = OFPP_LOCAL + 1;
+ }
+ return 0;
+}
+
+static void port_stats_done(void *state)
+{
+ free(state);
+}
+
+struct stats_type {
+ /* Value for 'type' member of struct ofp_stats_request. */
+ int type;
+
+ /* Minimum and maximum acceptable number of bytes in body member of
+ * struct ofp_stats_request. */
+ size_t min_body, max_body;
+
+ /* Prepares to dump some kind of statistics on 'dp'. 'body' and
+ * 'body_len' are the 'body' member of the struct ofp_stats_request.
+ * Returns zero if successful, otherwise a negative error code.
+ * May initialize '*state' to state information. May be null if no
+ * initialization is required.*/
+ int (*init)(struct datapath *dp, const void *body, int body_len,
+ void **state);
+
+ /* Appends statistics for 'dp' to 'buffer', which initially contains a
+ * struct ofp_stats_reply. On success, it should return 1 if it should be
+ * called again later with another buffer, 0 if it is done, or a negative
+ * errno value on failure. */
+ int (*dump)(struct datapath *dp, void *state, struct ofpbuf *buffer);
+
+ /* Cleans any state created by the init or dump functions. May be null
+ * if no cleanup is required. */
+ void (*done)(void *state);
+};
+
+static const struct stats_type stats[] = {
+ {
+ OFPST_DESC,
+ 0,
+ 0,
+ NULL,
+ desc_stats_dump,
+ NULL
+ },
+ {
+ OFPST_FLOW,
+ sizeof(struct ofp_flow_stats_request),
+ sizeof(struct ofp_flow_stats_request),
+ flow_stats_init,
+ flow_stats_dump,
+ flow_stats_done
+ },
+ {
+ OFPST_AGGREGATE,
+ sizeof(struct ofp_aggregate_stats_request),
+ sizeof(struct ofp_aggregate_stats_request),
+ aggregate_stats_init,
+ aggregate_stats_dump,
+ aggregate_stats_done
+ },
+ {
+ OFPST_TABLE,
+ 0,
+ 0,
+ NULL,
+ table_stats_dump,
+ NULL
+ },
+ {
+ OFPST_PORT,
+ 0,
+ 0,
+ port_stats_init,
+ port_stats_dump,
+ port_stats_done
+ },
+};
+
+struct stats_dump_cb {
+ bool done;
+ struct ofp_stats_request *rq;
+ struct sender sender;
+ const struct stats_type *s;
+ void *state;
+};
+
+static int
+stats_dump(struct datapath *dp, void *cb_)
+{
+ struct stats_dump_cb *cb = cb_;
+ struct ofp_stats_reply *osr;
+ struct ofpbuf *buffer;
+ int err;
+
+ if (cb->done) {
+ return 0;
+ }
+
+ osr = make_openflow_reply(sizeof *osr, OFPT_STATS_REPLY, &cb->sender,
+ &buffer);
+ osr->type = htons(cb->s->type);
+ osr->flags = 0;
+
+ err = cb->s->dump(dp, cb->state, buffer);
+ if (err >= 0) {
+ int err2;
+ if (!err) {
+ cb->done = true;
+ } else {
+ /* Buffer might have been reallocated, so find our data again. */
+ osr = ofpbuf_at_assert(buffer, 0, sizeof *osr);
+ osr->flags = ntohs(OFPSF_REPLY_MORE);
+ }
+ err2 = send_openflow_buffer(dp, buffer, &cb->sender);
+ if (err2) {
+ err = err2;
+ }
+ }
+
+ return err;
+}
+
+static void
+stats_done(void *cb_)
+{
+ struct stats_dump_cb *cb = cb_;
+ if (cb) {
+ if (cb->s->done) {
+ cb->s->done(cb->state);
+ }
+ free(cb);
+ }
+}
+
+static int
+recv_stats_request(struct datapath *dp, const struct sender *sender,
+ const void *oh)
+{
+ const struct ofp_stats_request *rq = oh;
+ size_t rq_len = ntohs(rq->header.length);
+ const struct stats_type *st;
+ struct stats_dump_cb *cb;
+ int type, body_len;
+ int err;
+
+ type = ntohs(rq->type);
+ for (st = stats; ; st++) {
+ if (st >= &stats[ARRAY_SIZE(stats)]) {
+ VLOG_WARN_RL(&rl, "received stats request of unknown type %d",
+ type);
+ return -EINVAL;
+ } else if (type == st->type) {
+ break;
+ }
+ }
+
+ cb = xmalloc(sizeof *cb);
+ cb->done = false;
+ cb->rq = xmemdup(rq, rq_len);
+ cb->sender = *sender;
+ cb->s = st;
+ cb->state = NULL;
+
+ body_len = rq_len - offsetof(struct ofp_stats_request, body);
+ if (body_len < cb->s->min_body || body_len > cb->s->max_body) {
+ VLOG_WARN_RL(&rl, "stats request type %d with bad body length %d",
+ type, body_len);
+ err = -EINVAL;
+ goto error;
+ }
+
+ if (cb->s->init) {
+ err = cb->s->init(dp, rq->body, body_len, &cb->state);
+ if (err) {
+ VLOG_WARN_RL(&rl,
+ "failed initialization of stats request type %d: %s",
+ type, strerror(-err));
+ goto error;
+ }
+ }
+
+ remote_start_dump(sender->remote, stats_dump, stats_done, cb);
+ return 0;
+
+error:
+ free(cb->rq);
+ free(cb);
+ return err;
+}
+
+static int
+recv_echo_request(struct datapath *dp, const struct sender *sender,
+ const void *oh)
+{
+ return send_openflow_buffer(dp, make_echo_reply(oh), sender);
+}
+
+static int
+recv_echo_reply(struct datapath *dp UNUSED, const struct sender *sender UNUSED,
+ const void *oh UNUSED)
+{
+ return 0;
+}
+
+/* 'msg', which is 'length' bytes long, was received from the control path.
+ * Apply it to 'chain'. */
+int
+fwd_control_input(struct datapath *dp, const struct sender *sender,
+ const void *msg, size_t length)
+{
+ int (*handler)(struct datapath *, const struct sender *, const void *);
+ struct ofp_header *oh;
+ size_t min_size;
+
+ /* Check encapsulated length. */
+ oh = (struct ofp_header *) msg;
+ if (ntohs(oh->length) > length) {
+ return -EINVAL;
+ }
+ assert(oh->version == OFP_VERSION);
+
+ /* Figure out how to handle it. */
+ switch (oh->type) {
+ case OFPT_FEATURES_REQUEST:
+ min_size = sizeof(struct ofp_header);
+ handler = recv_features_request;
+ break;
+ case OFPT_GET_CONFIG_REQUEST:
+ min_size = sizeof(struct ofp_header);
+ handler = recv_get_config_request;
+ break;
+ case OFPT_SET_CONFIG:
+ min_size = sizeof(struct ofp_switch_config);
+ handler = recv_set_config;
+ break;
+ case OFPT_PACKET_OUT:
+ min_size = sizeof(struct ofp_packet_out);
+ handler = recv_packet_out;
+ break;
+ case OFPT_FLOW_MOD:
+ min_size = sizeof(struct ofp_flow_mod);
+ handler = recv_flow;
+ break;
+ case OFPT_PORT_MOD:
+ min_size = sizeof(struct ofp_port_mod);
+ handler = recv_port_mod;
+ break;
+ case OFPT_STATS_REQUEST:
+ min_size = sizeof(struct ofp_stats_request);
+ handler = recv_stats_request;
+ break;
+ case OFPT_ECHO_REQUEST:
+ min_size = sizeof(struct ofp_header);
+ handler = recv_echo_request;
+ break;
+ case OFPT_ECHO_REPLY:
+ min_size = sizeof(struct ofp_header);
+ handler = recv_echo_reply;
+ break;
+ default:
+ dp_send_error_msg(dp, sender, OFPET_BAD_REQUEST, OFPBRC_BAD_TYPE,
+ msg, length);
+ return -EINVAL;
+ }
+
+ /* Handle it. */
+ if (length < min_size)
+ return -EFAULT;
+ return handler(dp, sender, msg);
+}
+\f
+/* Packet buffering. */
+
+#define OVERWRITE_SECS 1
+
+struct packet_buffer {
+ struct ofpbuf *buffer;
+ uint32_t cookie;
+ time_t timeout;
+};
+
+static struct packet_buffer buffers[N_PKT_BUFFERS];
+static unsigned int buffer_idx;
+
+uint32_t save_buffer(struct ofpbuf *buffer)
+{
+ struct packet_buffer *p;
+ uint32_t id;
+
+ buffer_idx = (buffer_idx + 1) & PKT_BUFFER_MASK;
+ p = &buffers[buffer_idx];
+ if (p->buffer) {
+ /* Don't buffer packet if existing entry is less than
+ * OVERWRITE_SECS old. */
+ if (time_now() < p->timeout) { /* FIXME */
+ return -1;
+ } else {
+ ofpbuf_delete(p->buffer);
+ }
+ }
+ /* Don't use maximum cookie value since the all-bits-1 id is
+ * special. */
+ if (++p->cookie >= (1u << PKT_COOKIE_BITS) - 1)
+ p->cookie = 0;
+ p->buffer = ofpbuf_clone(buffer); /* FIXME */
+ p->timeout = time_now() + OVERWRITE_SECS; /* FIXME */
+ id = buffer_idx | (p->cookie << PKT_BUFFER_BITS);
+
+ return id;
+}
+
+static struct ofpbuf *retrieve_buffer(uint32_t id)
+{
+ struct ofpbuf *buffer = NULL;
+ struct packet_buffer *p;
+
+ p = &buffers[id & PKT_BUFFER_MASK];
+ if (p->cookie == id >> PKT_BUFFER_BITS) {
+ buffer = p->buffer;
+ p->buffer = NULL;
+ } else {
+ printf("cookie mismatch: %x != %x\n",
+ id >> PKT_BUFFER_BITS, p->cookie);
+ }
+
+ return buffer;
+}
+
+static void discard_buffer(uint32_t id)
+{
+ struct packet_buffer *p;
+
+ p = &buffers[id & PKT_BUFFER_MASK];
+ if (p->cookie == id >> PKT_BUFFER_BITS) {
+ ofpbuf_delete(p->buffer);
+ p->buffer = NULL;
+ }
+}
git://git.onelab.eu / sliver-openvswitch.git / commitdiff