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320437cd400e00973a65daa480612d43e6c26d79
openflow/switch/datapath.c
T
Ben Pfaff 6b617bac12 Move exported headers to include/openflow, private headers to lib/. 
This makes it easier to install the headers, or to use them directly from
another software package with -I$(openflow)/include, without invading
the top-level include file namespace.
2008-10-29 15:15:45 -07:00

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/* 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);
}
/* '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, 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, 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->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, &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);
}
/* 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;
}
}
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