-/* 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;
-};
-
-/* 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 controller or a management device. */
-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 remote *controller; /* Connection to controller. */
- struct list remotes; /* All connections (including controller). */
- struct pvconn *listen_pvconn;
-
- 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 list port_list; /* List of ports, for flooding. */
-};
-
-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 *);
-
-void dp_update_port_flags(struct datapath *dp, const struct ofp_port_mod *opm);
-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 to userspace 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 int port_no(struct datapath *dp, struct sw_port *p)
-{
- assert(p >= dp->ports && p < &dp->ports[ARRAY_SIZE(dp->ports)]);
- return p - dp->ports;
-}
-
-/* Generates and returns a random datapath id. */
-static uint64_t
-gen_datapath_id(void)
-{
- uint8_t ea[ETH_ADDR_LEN];
- eth_addr_random(ea);
- return eth_addr_to_uint64(ea);
-}
-
-int
-dp_new(struct datapath **dp_, uint64_t dpid, struct rconn *rconn)
-{
- struct datapath *dp;
-
- dp = calloc(1, sizeof *dp);
- if (!dp) {
- return ENOMEM;
- }
-
- dp->last_timeout = time_now();
- list_init(&dp->remotes);
- dp->controller = remote_create(dp, rconn);
- dp->listen_pvconn = NULL;
- 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;
-}
-
-int
-dp_add_port(struct datapath *dp, const char *name)
-{
- struct netdev *netdev;
- struct in6_addr in6;
- struct in_addr in4;
- struct sw_port *p;
- int error;
-
- error = netdev_open(name, NETDEV_ETH_TYPE_ANY, &netdev);
- if (error) {
- return error;
- }
- error = netdev_set_flags(netdev, NETDEV_UP | NETDEV_PROMISC, false);
- if (error) {
- VLOG_ERR("couldn't set promiscuous mode on %s device", name);
- netdev_close(netdev);
- return error;
- }
- if (netdev_get_in4(netdev, &in4)) {
- VLOG_ERR("%s device has assigned IP address %s", 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", name, in6_name);
- }
-
- for (p = dp->ports; ; p++) {
- if (p >= &dp->ports[ARRAY_SIZE(dp->ports)]) {
- return EXFULL;
- } else if (!p->netdev) {
- break;
- }
- }
-
- memset(p, '\0', sizeof *p);
-
- p->dp = dp;
- p->netdev = netdev;
- list_push_back(&dp->port_list, &p->node);
-
- /* Notify the ctlpath that this port has been added */
- send_port_status(p, OFPPR_ADD);
-
- return 0;
-}
-
-void
-dp_add_listen_pvconn(struct datapath *dp, struct pvconn *listen_pvconn)
-{
- assert(!dp->listen_pvconn);
- dp->listen_pvconn = listen_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;
-
- 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);
- }
- if (dp->listen_pvconn) {
- for (;;) {
- struct vconn *new_vconn;
- int retval;
-
- retval = pvconn_accept(dp->listen_pvconn, OFP_VERSION, &new_vconn);
- if (retval) {
- if (retval != EAGAIN) {
- VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval));
- }
- break;
- }
- remote_create(dp, rconn_new_from_vconn("passive", new_vconn));
- }
- }
-}
-
-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;
-
- 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);
- }
- if (dp->listen_pvconn) {
- pvconn_wait(dp->listen_pvconn);
- }
-}
-
-/* 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 (port_no(dp, p) == 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 = port_no(dp, p);
- }
- 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, int out_port)
-{
- if (out_port >= 0 && out_port < DP_MAX_PORTS) {
- struct sw_port *p = &dp->ports[out_port];
- if (p->netdev != NULL && !(p->config & OFPPC_PORT_DOWN)) {
- if (!netdev_send(p->netdev, buffer)) {
- p->tx_packets++;
- p->tx_bytes += buffer->size;
- } else {
- p->tx_dropped++;
- }
- 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);
- if (out_port == OFPP_FLOOD) {
- output_all(dp, buffer, in_port, 1);
- } else if (out_port == OFPP_ALL) {
- output_all(dp, buffer, in_port, 0);
- } else if (out_port == OFPP_CONTROLLER) {
- dp_output_control(dp, buffer, in_port, 0, OFPR_ACTION);
- } else if (out_port == OFPP_IN_PORT) {
- output_packet(dp, buffer, in_port);
- } else if (out_port == OFPP_TABLE) {
- struct sw_port *p = in_port < DP_MAX_PORTS ? &dp->ports[in_port] : 0;
- if (run_flow_through_tables(dp, buffer, p)) {
- ofpbuf_delete(buffer);
- }
- } else {
- if (in_port == out_port) {
- VLOG_DBG_RL(&rl, "can't directly forward to input port");
- return;
- }
- output_packet(dp, buffer, out_port);
- }
-}
-
-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(struct datapath *dp, struct ofpbuf *buffer,
- const struct sender *sender)
-{
- struct remote *remote = sender ? sender->remote : dp->controller;
- struct rconn *rconn = remote->rconn;
- int retval;
-
- update_openflow_length(buffer);
- retval = rconn_send_with_limit(rconn, buffer, &remote->n_txq, TXQ_LIMIT);
- if (retval) {
- VLOG_WARN_RL(&rl, "send to %s failed: %s",
- rconn_get_name(rconn), strerror(retval));
- }
- return retval;
-}
-
-/* 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(port_no(dp, p));
- 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_zeros(buffer, sizeof *opp);
- fill_port_desc(dp, p, opp);
- }
- send_openflow_buffer(dp, buffer, sender);
-}
-
-void
-dp_update_port_flags(struct datapath *dp, const struct ofp_port_mod *opm)
-{
- int port_no = ntohs(opm->port_no);
- if (port_no < DP_MAX_PORTS) {
- struct sw_port *p = &dp->ports[port_no];
-
- /* Make sure the port id hasn't changed since this was sent */
- if (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_zeros(buffer, length);
- ofs->length = htons(length);
- ofs->table_id = table_idx;
- 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.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);
- 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 ? port_no(dp, p) : 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, port_no(dp, p),
- 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;
-
- dp_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_zeros(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_zeros(buffer, 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_zeros(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);
- 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 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];
- struct ofp_port_stats *ops;
- if (!p->netdev) {
- continue;
- }
- ops = ofpbuf_put_zeros(buffer, sizeof *ops);
- ops->port_no = htons(port_no(dp, p));
- ops->rx_packets = htonll(p->rx_packets);
- ops->tx_packets = htonll(p->tx_packets);
- ops->rx_bytes = htonll(p->rx_bytes);
- ops->tx_bytes = htonll(p->tx_bytes);
- ops->rx_dropped = htonll(-1);
- ops->tx_dropped = htonll(p->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);
- ops++;
- }
- s->port = i;
- 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