/*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
+#include <sys/socket.h>
#include <net/if.h>
#include <string.h>
+#include <stdlib.h>
+#include "dhcp.h"
#include "dpif.h"
#include "flow.h"
-#include "mac-learning.h"
#include "netdev.h"
#include "odp-util.h"
-#include "ofp-print.h"
#include "ofproto.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
#include "packets.h"
#include "poll-loop.h"
-#include "rconn.h"
#include "status.h"
#include "timeval.h"
-#include "vconn.h"
-
-#define THIS_MODULE VLM_in_band
#include "vlog.h"
-#define IB_BASE_PRIORITY 18181800
+VLOG_DEFINE_THIS_MODULE(in_band)
+/* In-band control allows a single network to be used for OpenFlow
+ * traffic and other data traffic. Refer to ovs-vswitchd.conf(5) and
+ * secchan(8) for a description of configuring in-band control.
+ *
+ * This comment is an attempt to describe how in-band control works at a
+ * wire- and implementation-level. Correctly implementing in-band
+ * control has proven difficult due to its many subtleties, and has thus
+ * gone through many iterations. Please read through and understand the
+ * reasoning behind the chosen rules before making modifications.
+ *
+ * In Open vSwitch, in-band control is implemented as "hidden" flows (in that
+ * they are not visible through OpenFlow) and at a higher priority than
+ * wildcarded flows can be set up by through OpenFlow. This is done so that
+ * the OpenFlow controller cannot interfere with them and possibly break
+ * connectivity with its switches. It is possible to see all flows, including
+ * in-band ones, with the ovs-appctl "bridge/dump-flows" command.
+ *
+ * The Open vSwitch implementation of in-band control can hide traffic to
+ * arbitrary "remotes", where each remote is one TCP port on one IP address.
+ * Currently the remotes are automatically configured as the in-band OpenFlow
+ * controllers plus the OVSDB managers, if any. (The latter is a requirement
+ * because OVSDB managers are responsible for configuring OpenFlow controllers,
+ * so if the manager cannot be reached then OpenFlow cannot be reconfigured.)
+ *
+ * The following rules (with the OFPP_NORMAL action) are set up on any bridge
+ * that has any remotes:
+ *
+ * (a) DHCP requests sent from the local port.
+ * (b) ARP replies to the local port's MAC address.
+ * (c) ARP requests from the local port's MAC address.
+ *
+ * In-band also sets up the following rules for each unique next-hop MAC
+ * address for the remotes' IPs (the "next hop" is either the remote
+ * itself, if it is on a local subnet, or the gateway to reach the remote):
+ *
+ * (d) ARP replies to the next hop's MAC address.
+ * (e) ARP requests from the next hop's MAC address.
+ *
+ * In-band also sets up the following rules for each unique remote IP address:
+ *
+ * (f) ARP replies containing the remote's IP address as a target.
+ * (g) ARP requests containing the remote's IP address as a source.
+ *
+ * In-band also sets up the following rules for each unique remote (IP,port)
+ * pair:
+ *
+ * (h) TCP traffic to the remote's IP and port.
+ * (i) TCP traffic from the remote's IP and port.
+ *
+ * The goal of these rules is to be as narrow as possible to allow a
+ * switch to join a network and be able to communicate with the
+ * remotes. As mentioned earlier, these rules have higher priority
+ * than the controller's rules, so if they are too broad, they may
+ * prevent the controller from implementing its policy. As such,
+ * in-band actively monitors some aspects of flow and packet processing
+ * so that the rules can be made more precise.
+ *
+ * In-band control monitors attempts to add flows into the datapath that
+ * could interfere with its duties. The datapath only allows exact
+ * match entries, so in-band control is able to be very precise about
+ * the flows it prevents. Flows that miss in the datapath are sent to
+ * userspace to be processed, so preventing these flows from being
+ * cached in the "fast path" does not affect correctness. The only type
+ * of flow that is currently prevented is one that would prevent DHCP
+ * replies from being seen by the local port. For example, a rule that
+ * forwarded all DHCP traffic to the controller would not be allowed,
+ * but one that forwarded to all ports (including the local port) would.
+ *
+ * As mentioned earlier, packets that miss in the datapath are sent to
+ * the userspace for processing. The userspace has its own flow table,
+ * the "classifier", so in-band checks whether any special processing
+ * is needed before the classifier is consulted. If a packet is a DHCP
+ * response to a request from the local port, the packet is forwarded to
+ * the local port, regardless of the flow table. Note that this requires
+ * L7 processing of DHCP replies to determine whether the 'chaddr' field
+ * matches the MAC address of the local port.
+ *
+ * It is interesting to note that for an L3-based in-band control
+ * mechanism, the majority of rules are devoted to ARP traffic. At first
+ * glance, some of these rules appear redundant. However, each serves an
+ * important role. First, in order to determine the MAC address of the
+ * remote side (controller or gateway) for other ARP rules, we must allow
+ * ARP traffic for our local port with rules (b) and (c). If we are
+ * between a switch and its connection to the remote, we have to
+ * allow the other switch's ARP traffic to through. This is done with
+ * rules (d) and (e), since we do not know the addresses of the other
+ * switches a priori, but do know the remote's or gateway's. Finally,
+ * if the remote is running in a local guest VM that is not reached
+ * through the local port, the switch that is connected to the VM must
+ * allow ARP traffic based on the remote's IP address, since it will
+ * not know the MAC address of the local port that is sending the traffic
+ * or the MAC address of the remote in the guest VM.
+ *
+ * With a few notable exceptions below, in-band should work in most
+ * network setups. The following are considered "supported' in the
+ * current implementation:
+ *
+ * - Locally Connected. The switch and remote are on the same
+ * subnet. This uses rules (a), (b), (c), (h), and (i).
+ *
+ * - Reached through Gateway. The switch and remote are on
+ * different subnets and must go through a gateway. This uses
+ * rules (a), (b), (c), (h), and (i).
+ *
+ * - Between Switch and Remote. This switch is between another
+ * switch and the remote, and we want to allow the other
+ * switch's traffic through. This uses rules (d), (e), (h), and
+ * (i). It uses (b) and (c) indirectly in order to know the MAC
+ * address for rules (d) and (e). Note that DHCP for the other
+ * switch will not work unless an OpenFlow controller explicitly lets this
+ * switch pass the traffic.
+ *
+ * - Between Switch and Gateway. This switch is between another
+ * switch and the gateway, and we want to allow the other switch's
+ * traffic through. This uses the same rules and logic as the
+ * "Between Switch and Remote" configuration described earlier.
+ *
+ * - Remote on Local VM. The remote is a guest VM on the
+ * system running in-band control. This uses rules (a), (b), (c),
+ * (h), and (i).
+ *
+ * - Remote on Local VM with Different Networks. The remote
+ * is a guest VM on the system running in-band control, but the
+ * local port is not used to connect to the remote. For
+ * example, an IP address is configured on eth0 of the switch. The
+ * remote's VM is connected through eth1 of the switch, but an
+ * IP address has not been configured for that port on the switch.
+ * As such, the switch will use eth0 to connect to the remote,
+ * and eth1's rules about the local port will not work. In the
+ * example, the switch attached to eth0 would use rules (a), (b),
+ * (c), (h), and (i) on eth0. The switch attached to eth1 would use
+ * rules (f), (g), (h), and (i).
+ *
+ * The following are explicitly *not* supported by in-band control:
+ *
+ * - Specify Remote by Name. Currently, the remote must be
+ * identified by IP address. A naive approach would be to permit
+ * all DNS traffic. Unfortunately, this would prevent the
+ * controller from defining any policy over DNS. Since switches
+ * that are located behind us need to connect to the remote,
+ * in-band cannot simply add a rule that allows DNS traffic from
+ * the local port. The "correct" way to support this is to parse
+ * DNS requests to allow all traffic related to a request for the
+ * remote's name through. Due to the potential security
+ * problems and amount of processing, we decided to hold off for
+ * the time-being.
+ *
+ * - Differing Remotes for Switches. All switches must know
+ * the L3 addresses for all the remotes that other switches
+ * may use, since rules need to be set up to allow traffic related
+ * to those remotes through. See rules (f), (g), (h), and (i).
+ *
+ * - Differing Routes for Switches. In order for the switch to
+ * allow other switches to connect to a remote through a
+ * gateway, it allows the gateway's traffic through with rules (d)
+ * and (e). If the routes to the remote differ for the two
+ * switches, we will not know the MAC address of the alternate
+ * gateway.
+ */
+
+/* Priorities used in classifier for in-band rules. These values are higher
+ * than any that may be set with OpenFlow, and "18" kind of looks like "IB".
+ * The ordering of priorities is not important because all of the rules set up
+ * by in-band control have the same action. The only reason to use more than
+ * one priority is to make the kind of flow easier to see during debugging. */
enum {
- IBR_FROM_LOCAL_PORT, /* Sent by ofproto local port. */
- IBR_TO_LOCAL_PORT, /* Sent to ofproto local port. */
- IBR_ARP_FROM_CTL, /* ARP from the controller. */
- IBR_TO_CTL_OFP_SRC, /* To controller, OpenFlow source port. */
- IBR_TO_CTL_OFP_DST, /* To controller, OpenFlow dest port. */
- IBR_FROM_CTL_OFP_SRC, /* From controller, OpenFlow source port. */
- IBR_FROM_CTL_OFP_DST, /* From controller, OpenFlow dest port. */
-#if OFP_TCP_PORT != OFP_SSL_PORT
-#error Need to support separate TCP and SSL flows.
-#endif
- N_IB_RULES
+ /* One set per bridge. */
+ IBR_FROM_LOCAL_DHCP = 180000, /* (a) From local port, DHCP. */
+ IBR_TO_LOCAL_ARP, /* (b) To local port, ARP. */
+ IBR_FROM_LOCAL_ARP, /* (c) From local port, ARP. */
+
+ /* One set per unique next-hop MAC. */
+ IBR_TO_NEXT_HOP_ARP, /* (d) To remote MAC, ARP. */
+ IBR_FROM_NEXT_HOP_ARP, /* (e) From remote MAC, ARP. */
+
+ /* One set per unique remote IP address. */
+ IBR_TO_REMOTE_ARP, /* (f) To remote IP, ARP. */
+ IBR_FROM_REMOTE_ARP, /* (g) From remote IP, ARP. */
+
+ /* One set per unique remote (IP,port) pair. */
+ IBR_TO_REMOTE_TCP, /* (h) To remote IP, TCP port. */
+ IBR_FROM_REMOTE_TCP /* (i) From remote IP, TCP port. */
};
-struct ib_rule {
- bool installed;
+struct in_band_rule {
flow_t flow;
uint32_t wildcards;
unsigned int priority;
};
+/* Track one remote IP and next hop information. */
+struct in_band_remote {
+ struct sockaddr_in remote_addr; /* IP address, in network byte order. */
+ uint8_t remote_mac[ETH_ADDR_LEN]; /* Next-hop MAC, all-zeros if unknown. */
+ uint8_t last_remote_mac[ETH_ADDR_LEN]; /* Previous nonzero next-hop MAC. */
+ struct netdev *remote_netdev; /* Device to send to next-hop MAC. */
+};
+
struct in_band {
struct ofproto *ofproto;
- struct netdev *netdev;
- struct rconn *controller;
struct status_category *ss_cat;
- /* Keeping track of controller's MAC address. */
- uint32_t ip; /* Current IP, 0 if unknown. */
- uint32_t last_ip; /* Last known IP, 0 if never known. */
- uint8_t mac[ETH_ADDR_LEN]; /* Current MAC, 0 if unknown. */
- uint8_t last_mac[ETH_ADDR_LEN]; /* Last known MAC, 0 if never known */
- time_t next_refresh; /* Next time to refresh MAC address. */
+ /* Remote information. */
+ time_t next_remote_refresh; /* Refresh timer. */
+ struct in_band_remote *remotes;
+ size_t n_remotes;
- /* Keeping track of the local port's MAC address. */
+ /* Local information. */
+ time_t next_local_refresh; /* Refresh timer. */
uint8_t local_mac[ETH_ADDR_LEN]; /* Current MAC. */
- time_t next_local_refresh; /* Next time to refresh MAC address. */
-
- /* Rules that we set up. */
- struct ib_rule rules[N_IB_RULES];
+ struct netdev *local_netdev; /* Local port's network device. */
+
+ /* Local and remote addresses that are installed as flows. */
+ uint8_t installed_local_mac[ETH_ADDR_LEN];
+ struct sockaddr_in *remote_addrs;
+ size_t n_remote_addrs;
+ uint8_t *remote_macs;
+ size_t n_remote_macs;
};
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60);
-static const uint8_t *
-get_controller_mac(struct in_band *ib)
+static int
+refresh_remote(struct in_band *ib, struct in_band_remote *r)
{
- time_t now = time_now();
- uint32_t ip;
-
- ip = rconn_get_ip(ib->controller);
- if (ip != ib->ip || now >= ib->next_refresh) {
- bool have_mac;
-
- ib->ip = ip;
-
- /* Look up MAC address. */
- memset(ib->mac, 0, sizeof ib->mac);
- if (ib->ip) {
- int retval = netdev_arp_lookup(ib->netdev, ib->ip, ib->mac);
- if (retval) {
- VLOG_DBG_RL(&rl, "cannot look up controller hw address "
- "("IP_FMT"): %s",
- IP_ARGS(&ib->ip), strerror(retval));
- }
- }
- have_mac = !eth_addr_is_zero(ib->mac);
+ struct in_addr next_hop_inaddr;
+ char *next_hop_dev;
+ int retval;
+
+ /* Find the next-hop IP address. */
+ memset(r->remote_mac, 0, sizeof r->remote_mac);
+ retval = netdev_get_next_hop(ib->local_netdev, &r->remote_addr.sin_addr,
+ &next_hop_inaddr, &next_hop_dev);
+ if (retval) {
+ VLOG_WARN("cannot find route for controller ("IP_FMT"): %s",
+ IP_ARGS(&r->remote_addr.sin_addr), strerror(retval));
+ return 1;
+ }
+ if (!next_hop_inaddr.s_addr) {
+ next_hop_inaddr = r->remote_addr.sin_addr;
+ }
- /* Log changes in IP, MAC addresses. */
- if (ib->ip && ib->ip != ib->last_ip) {
- VLOG_DBG("controller IP address changed from "IP_FMT
- " to "IP_FMT, IP_ARGS(&ib->last_ip), IP_ARGS(&ib->ip));
- ib->last_ip = ib->ip;
+ /* Open the next-hop network device. */
+ if (!r->remote_netdev
+ || strcmp(netdev_get_name(r->remote_netdev), next_hop_dev))
+ {
+ netdev_close(r->remote_netdev);
+
+ retval = netdev_open_default(next_hop_dev, &r->remote_netdev);
+ if (retval) {
+ VLOG_WARN_RL(&rl, "cannot open netdev %s (next hop "
+ "to controller "IP_FMT"): %s",
+ next_hop_dev, IP_ARGS(&r->remote_addr.sin_addr),
+ strerror(retval));
+ free(next_hop_dev);
+ return 1;
}
- if (have_mac && memcmp(ib->last_mac, ib->mac, ETH_ADDR_LEN)) {
- VLOG_DBG("controller MAC address changed from "ETH_ADDR_FMT" to "
- ETH_ADDR_FMT,
- ETH_ADDR_ARGS(ib->last_mac), ETH_ADDR_ARGS(ib->mac));
- memcpy(ib->last_mac, ib->mac, ETH_ADDR_LEN);
- }
-
- /* Schedule next refresh.
- *
- * If we have an IP address but not a MAC address, then refresh
- * quickly, since we probably will get a MAC address soon (via ARP).
- * Otherwise, we can afford to wait a little while. */
- ib->next_refresh = now + (!ib->ip || have_mac ? 10 : 1);
}
- return !eth_addr_is_zero(ib->mac) ? ib->mac : NULL;
+ free(next_hop_dev);
+
+ /* Look up the MAC address of the next-hop IP address. */
+ retval = netdev_arp_lookup(r->remote_netdev, next_hop_inaddr.s_addr,
+ r->remote_mac);
+ if (retval) {
+ VLOG_DBG_RL(&rl, "cannot look up remote MAC address ("IP_FMT"): %s",
+ IP_ARGS(&next_hop_inaddr.s_addr), strerror(retval));
+ }
+
+ /* If we don't have a MAC address, then refresh quickly, since we probably
+ * will get a MAC address soon (via ARP). Otherwise, we can afford to wait
+ * a little while. */
+ return eth_addr_is_zero(r->remote_mac) ? 1 : 10;
}
-static const uint8_t *
-get_local_mac(struct in_band *ib)
+static bool
+refresh_remotes(struct in_band *ib)
{
- time_t now = time_now();
- if (now >= ib->next_local_refresh) {
- uint8_t ea[ETH_ADDR_LEN];
- if (!netdev_nodev_get_etheraddr(netdev_get_name(ib->netdev), ea)) {
- memcpy(ib->local_mac, ea, ETH_ADDR_LEN);
+ struct in_band_remote *r;
+ bool any_changes;
+
+ if (time_now() < ib->next_remote_refresh) {
+ return false;
+ }
+
+ any_changes = false;
+ ib->next_remote_refresh = TIME_MAX;
+ for (r = ib->remotes; r < &ib->remotes[ib->n_remotes]; r++) {
+ uint8_t old_remote_mac[ETH_ADDR_LEN];
+ time_t next_refresh;
+
+ /* Save old MAC. */
+ memcpy(old_remote_mac, r->remote_mac, ETH_ADDR_LEN);
+
+ /* Refresh remote information. */
+ next_refresh = refresh_remote(ib, r) + time_now();
+ ib->next_remote_refresh = MIN(ib->next_remote_refresh, next_refresh);
+
+ /* If the MAC changed, log the changes. */
+ if (!eth_addr_equals(r->remote_mac, old_remote_mac)) {
+ any_changes = true;
+ if (!eth_addr_is_zero(r->remote_mac)
+ && !eth_addr_equals(r->last_remote_mac, r->remote_mac)) {
+ VLOG_DBG("remote MAC address changed from "ETH_ADDR_FMT
+ " to "ETH_ADDR_FMT,
+ ETH_ADDR_ARGS(r->last_remote_mac),
+ ETH_ADDR_ARGS(r->remote_mac));
+ memcpy(r->last_remote_mac, r->remote_mac, ETH_ADDR_LEN);
+ }
}
- ib->next_local_refresh = now + 1;
}
- return !eth_addr_is_zero(ib->local_mac) ? ib->local_mac : NULL;
+
+ return any_changes;
+}
+
+/* Refreshes the MAC address of the local port into ib->local_mac, if it is due
+ * for a refresh. Returns true if anything changed, otherwise false. */
+static bool
+refresh_local(struct in_band *ib)
+{
+ uint8_t ea[ETH_ADDR_LEN];
+ time_t now;
+
+ now = time_now();
+ if (now < ib->next_local_refresh) {
+ return false;
+ }
+ ib->next_local_refresh = now + 1;
+
+ if (netdev_get_etheraddr(ib->local_netdev, ea)
+ || eth_addr_equals(ea, ib->local_mac)) {
+ return false;
+ }
+
+ memcpy(ib->local_mac, ea, ETH_ADDR_LEN);
+ return true;
}
static void
in_band_status_cb(struct status_reply *sr, void *in_band_)
{
struct in_band *in_band = in_band_;
- struct in_addr local_ip;
- const uint8_t *local_mac;
- uint32_t controller_ip;
- const uint8_t *controller_mac;
- if (netdev_get_in4(in_band->netdev, &local_ip)) {
- status_reply_put(sr, "local-ip="IP_FMT, IP_ARGS(&local_ip.s_addr));
- }
- local_mac = get_local_mac(in_band);
- if (local_mac) {
+ if (!eth_addr_is_zero(in_band->local_mac)) {
status_reply_put(sr, "local-mac="ETH_ADDR_FMT,
- ETH_ADDR_ARGS(local_mac));
+ ETH_ADDR_ARGS(in_band->local_mac));
+ }
+
+ if (in_band->n_remotes
+ && !eth_addr_is_zero(in_band->remotes[0].remote_mac)) {
+ status_reply_put(sr, "remote-mac="ETH_ADDR_FMT,
+ ETH_ADDR_ARGS(in_band->remotes[0].remote_mac));
+ }
+}
+
+/* Returns true if 'packet' should be sent to the local port regardless
+ * of the flow table. */
+bool
+in_band_msg_in_hook(struct in_band *in_band, const flow_t *flow,
+ const struct ofpbuf *packet)
+{
+ if (!in_band) {
+ return false;
+ }
+
+ /* Regardless of how the flow table is configured, we want to be
+ * able to see replies to our DHCP requests. */
+ if (flow->dl_type == htons(ETH_TYPE_IP)
+ && flow->nw_proto == IP_TYPE_UDP
+ && flow->tp_src == htons(DHCP_SERVER_PORT)
+ && flow->tp_dst == htons(DHCP_CLIENT_PORT)
+ && packet->l7) {
+ struct dhcp_header *dhcp;
+
+ dhcp = ofpbuf_at(packet, (char *)packet->l7 - (char *)packet->data,
+ sizeof *dhcp);
+ if (!dhcp) {
+ return false;
+ }
+
+ refresh_local(in_band);
+ if (!eth_addr_is_zero(in_band->local_mac)
+ && eth_addr_equals(dhcp->chaddr, in_band->local_mac)) {
+ return true;
+ }
}
- controller_ip = rconn_get_ip(in_band->controller);
- if (controller_ip) {
- status_reply_put(sr, "controller-ip="IP_FMT,
- IP_ARGS(&controller_ip));
+ return false;
+}
+
+/* Returns true if the rule that would match 'flow' with 'actions' is
+ * allowed to be set up in the datapath. */
+bool
+in_band_rule_check(struct in_band *in_band, const flow_t *flow,
+ const struct odp_actions *actions)
+{
+ if (!in_band) {
+ return true;
}
- controller_mac = get_controller_mac(in_band);
- if (controller_mac) {
- status_reply_put(sr, "controller-mac="ETH_ADDR_FMT,
- ETH_ADDR_ARGS(controller_mac));
+
+ /* Don't allow flows that would prevent DHCP replies from being seen
+ * by the local port. */
+ if (flow->dl_type == htons(ETH_TYPE_IP)
+ && flow->nw_proto == IP_TYPE_UDP
+ && flow->tp_src == htons(DHCP_SERVER_PORT)
+ && flow->tp_dst == htons(DHCP_CLIENT_PORT)) {
+ int i;
+
+ for (i=0; i<actions->n_actions; i++) {
+ if (actions->actions[i].output.type == ODPAT_OUTPUT
+ && actions->actions[i].output.port == ODPP_LOCAL) {
+ return true;
+ }
+ }
+ return false;
}
+
+ return true;
+}
+
+static void
+init_rule(struct in_band_rule *rule, unsigned int priority)
+{
+ rule->wildcards = OVSFW_ALL;
+ rule->priority = priority;
+
+ /* Not strictly necessary but seems cleaner. */
+ memset(&rule->flow, 0, sizeof rule->flow);
+}
+
+static void
+set_in_port(struct in_band_rule *rule, uint16_t odp_port)
+{
+ rule->wildcards &= ~OFPFW_IN_PORT;
+ rule->flow.in_port = odp_port;
+}
+
+static void
+set_dl_type(struct in_band_rule *rule, uint16_t dl_type)
+{
+ rule->wildcards &= ~OFPFW_DL_TYPE;
+ rule->flow.dl_type = dl_type;
}
static void
-drop_flow(struct in_band *in_band, int rule_idx)
+set_dl_src(struct in_band_rule *rule, const uint8_t dl_src[ETH_ADDR_LEN])
{
- struct ib_rule *rule = &in_band->rules[rule_idx];
+ rule->wildcards &= ~OFPFW_DL_SRC;
+ memcpy(rule->flow.dl_src, dl_src, ETH_ADDR_LEN);
+}
+
+static void
+set_dl_dst(struct in_band_rule *rule, const uint8_t dl_dst[ETH_ADDR_LEN])
+{
+ rule->wildcards &= ~OFPFW_DL_DST;
+ memcpy(rule->flow.dl_dst, dl_dst, ETH_ADDR_LEN);
+}
+
+static void
+set_tp_src(struct in_band_rule *rule, uint16_t tp_src)
+{
+ rule->wildcards &= ~OFPFW_TP_SRC;
+ rule->flow.tp_src = tp_src;
+}
+
+static void
+set_tp_dst(struct in_band_rule *rule, uint16_t tp_dst)
+{
+ rule->wildcards &= ~OFPFW_TP_DST;
+ rule->flow.tp_dst = tp_dst;
+}
+
+static void
+set_nw_proto(struct in_band_rule *rule, uint8_t nw_proto)
+{
+ rule->wildcards &= ~OFPFW_NW_PROTO;
+ rule->flow.nw_proto = nw_proto;
+}
- if (rule->installed) {
- rule->installed = false;
- ofproto_delete_flow(in_band->ofproto, &rule->flow, rule->wildcards,
- rule->priority);
+static void
+set_nw_src(struct in_band_rule *rule, const struct in_addr nw_src)
+{
+ rule->wildcards &= ~OFPFW_NW_SRC_MASK;
+ rule->flow.nw_src = nw_src.s_addr;
+}
+
+static void
+set_nw_dst(struct in_band_rule *rule, const struct in_addr nw_dst)
+{
+ rule->wildcards &= ~OFPFW_NW_DST_MASK;
+ rule->flow.nw_dst = nw_dst.s_addr;
+}
+
+static void
+make_rules(struct in_band *ib,
+ void (*cb)(struct in_band *, const struct in_band_rule *))
+{
+ struct in_band_rule rule;
+ size_t i;
+
+ if (!eth_addr_is_zero(ib->installed_local_mac)) {
+ /* (a) Allow DHCP requests sent from the local port. */
+ init_rule(&rule, IBR_FROM_LOCAL_DHCP);
+ set_in_port(&rule, ODPP_LOCAL);
+ set_dl_type(&rule, htons(ETH_TYPE_IP));
+ set_dl_src(&rule, ib->installed_local_mac);
+ set_nw_proto(&rule, IP_TYPE_UDP);
+ set_tp_src(&rule, htons(DHCP_CLIENT_PORT));
+ set_tp_dst(&rule, htons(DHCP_SERVER_PORT));
+ cb(ib, &rule);
+
+ /* (b) Allow ARP replies to the local port's MAC address. */
+ init_rule(&rule, IBR_TO_LOCAL_ARP);
+ set_dl_type(&rule, htons(ETH_TYPE_ARP));
+ set_dl_dst(&rule, ib->installed_local_mac);
+ set_nw_proto(&rule, ARP_OP_REPLY);
+ cb(ib, &rule);
+
+ /* (c) Allow ARP requests from the local port's MAC address. */
+ init_rule(&rule, IBR_FROM_LOCAL_ARP);
+ set_dl_type(&rule, htons(ETH_TYPE_ARP));
+ set_dl_src(&rule, ib->installed_local_mac);
+ set_nw_proto(&rule, ARP_OP_REQUEST);
+ cb(ib, &rule);
+ }
+
+ for (i = 0; i < ib->n_remote_macs; i++) {
+ const uint8_t *remote_mac = &ib->remote_macs[i * ETH_ADDR_LEN];
+
+ if (i > 0) {
+ const uint8_t *prev_mac = &ib->remote_macs[(i - 1) * ETH_ADDR_LEN];
+ if (eth_addr_equals(remote_mac, prev_mac)) {
+ /* Skip duplicates. */
+ continue;
+ }
+ }
+
+ /* (d) Allow ARP replies to the next hop's MAC address. */
+ init_rule(&rule, IBR_TO_NEXT_HOP_ARP);
+ set_dl_type(&rule, htons(ETH_TYPE_ARP));
+ set_dl_dst(&rule, remote_mac);
+ set_nw_proto(&rule, ARP_OP_REPLY);
+ cb(ib, &rule);
+
+ /* (e) Allow ARP requests from the next hop's MAC address. */
+ init_rule(&rule, IBR_FROM_NEXT_HOP_ARP);
+ set_dl_type(&rule, htons(ETH_TYPE_ARP));
+ set_dl_src(&rule, remote_mac);
+ set_nw_proto(&rule, ARP_OP_REQUEST);
+ cb(ib, &rule);
+ }
+
+ for (i = 0; i < ib->n_remote_addrs; i++) {
+ const struct sockaddr_in *a = &ib->remote_addrs[i];
+
+ if (!i || a->sin_addr.s_addr != a[-1].sin_addr.s_addr) {
+ /* (f) Allow ARP replies containing the remote's IP address as a
+ * target. */
+ init_rule(&rule, IBR_TO_REMOTE_ARP);
+ set_dl_type(&rule, htons(ETH_TYPE_ARP));
+ set_nw_proto(&rule, ARP_OP_REPLY);
+ set_nw_dst(&rule, a->sin_addr);
+ cb(ib, &rule);
+
+ /* (g) Allow ARP requests containing the remote's IP address as a
+ * source. */
+ init_rule(&rule, IBR_FROM_REMOTE_ARP);
+ set_dl_type(&rule, htons(ETH_TYPE_ARP));
+ set_nw_proto(&rule, ARP_OP_REQUEST);
+ set_nw_src(&rule, a->sin_addr);
+ cb(ib, &rule);
+ }
+
+ if (!i
+ || a->sin_addr.s_addr != a[-1].sin_addr.s_addr
+ || a->sin_port != a[-1].sin_port) {
+ /* (h) Allow TCP traffic to the remote's IP and port. */
+ init_rule(&rule, IBR_TO_REMOTE_TCP);
+ set_dl_type(&rule, htons(ETH_TYPE_IP));
+ set_nw_proto(&rule, IP_TYPE_TCP);
+ set_nw_dst(&rule, a->sin_addr);
+ set_tp_dst(&rule, a->sin_port);
+ cb(ib, &rule);
+
+ /* (i) Allow TCP traffic from the remote's IP and port. */
+ init_rule(&rule, IBR_FROM_REMOTE_TCP);
+ set_dl_type(&rule, htons(ETH_TYPE_IP));
+ set_nw_proto(&rule, IP_TYPE_TCP);
+ set_nw_src(&rule, a->sin_addr);
+ set_tp_src(&rule, a->sin_port);
+ cb(ib, &rule);
+ }
}
}
-/* out_port and fixed_fields are assumed never to change. */
static void
-setup_flow(struct in_band *in_band, int rule_idx, const flow_t *flow,
- uint32_t fixed_fields, uint16_t out_port)
+drop_rule(struct in_band *ib, const struct in_band_rule *rule)
{
- struct ib_rule *rule = &in_band->rules[rule_idx];
+ ofproto_delete_flow(ib->ofproto, &rule->flow,
+ rule->wildcards, rule->priority);
+}
- if (!rule->installed || memcmp(flow, &rule->flow, sizeof *flow)) {
- union ofp_action action;
+/* Drops from the flow table all of the flows set up by 'ib', then clears out
+ * the information about the installed flows so that they can be filled in
+ * again if necessary. */
+static void
+drop_rules(struct in_band *ib)
+{
+ /* Drop rules. */
+ make_rules(ib, drop_rule);
- drop_flow(in_band, rule_idx);
+ /* Clear out state. */
+ memset(ib->installed_local_mac, 0, sizeof ib->installed_local_mac);
- rule->installed = true;
- rule->flow = *flow;
- rule->wildcards = OFPFW_ALL & ~fixed_fields;
- rule->priority = IB_BASE_PRIORITY + (N_IB_RULES - rule_idx);
+ free(ib->remote_addrs);
+ ib->remote_addrs = NULL;
+ ib->n_remote_addrs = 0;
+
+ free(ib->remote_macs);
+ ib->remote_macs = NULL;
+ ib->n_remote_macs = 0;
+}
- action.type = htons(OFPAT_OUTPUT);
- action.output.len = htons(sizeof action);
- action.output.port = htons(out_port);
- action.output.max_len = htons(0);
- ofproto_add_flow(in_band->ofproto, &rule->flow, rule->wildcards,
- rule->priority, &action, 1, 0);
+static void
+add_rule(struct in_band *ib, const struct in_band_rule *rule)
+{
+ union ofp_action action;
+
+ action.type = htons(OFPAT_OUTPUT);
+ action.output.len = htons(sizeof action);
+ action.output.port = htons(OFPP_NORMAL);
+ action.output.max_len = htons(0);
+ ofproto_add_flow(ib->ofproto, &rule->flow, rule->wildcards,
+ rule->priority, &action, 1, 0);
+}
+
+/* Inserts flows into the flow table for the current state of 'ib'. */
+static void
+add_rules(struct in_band *ib)
+{
+ make_rules(ib, add_rule);
+}
+
+static int
+compare_addrs(const void *a_, const void *b_)
+{
+ const struct sockaddr_in *a = a_;
+ const struct sockaddr_in *b = b_;
+ int cmp;
+
+ cmp = memcmp(&a->sin_addr.s_addr,
+ &b->sin_addr.s_addr,
+ sizeof a->sin_addr.s_addr);
+ if (cmp) {
+ return cmp;
}
+ return memcmp(&a->sin_port, &b->sin_port, sizeof a->sin_port);
+}
+
+static int
+compare_macs(const void *a, const void *b)
+{
+ return memcmp(a, b, ETH_ADDR_LEN);
}
void
-in_band_run(struct in_band *in_band)
+in_band_run(struct in_band *ib)
{
- const uint8_t *controller_mac;
- const uint8_t *local_mac;
- flow_t flow;
+ struct in_band_remote *r;
+ bool local_change, remote_change;
- if (time_now() < MIN(in_band->next_refresh, in_band->next_local_refresh)) {
+ local_change = refresh_local(ib);
+ remote_change = refresh_remotes(ib);
+ if (!local_change && !remote_change) {
+ /* Nothing changed, nothing to do. */
return;
}
- controller_mac = get_controller_mac(in_band);
- local_mac = get_local_mac(in_band);
-
- /* Switch traffic sent from the local port. */
- memset(&flow, 0, sizeof flow);
- flow.in_port = ODPP_LOCAL;
- setup_flow(in_band, IBR_FROM_LOCAL_PORT, &flow, OFPFW_IN_PORT,
- OFPP_NORMAL);
-
- /* Deliver traffic sent to the local port. */
- if (local_mac) {
- memset(&flow, 0, sizeof flow);
- memcpy(flow.dl_dst, local_mac, ETH_ADDR_LEN);
- setup_flow(in_band, IBR_TO_LOCAL_PORT, &flow, OFPFW_DL_DST,
- OFPP_NORMAL);
- } else {
- drop_flow(in_band, IBR_TO_LOCAL_PORT);
- }
- if (controller_mac) {
- /* Switch ARP requests sent by the controller. (OFPP_NORMAL will "do
- * the right thing" regarding VLANs here.) */
- memset(&flow, 0, sizeof flow);
- flow.dl_type = htons(ETH_TYPE_ARP);
- memcpy(flow.dl_dst, eth_addr_broadcast, ETH_ADDR_LEN);
- memcpy(flow.dl_src, controller_mac, ETH_ADDR_LEN);
- setup_flow(in_band, IBR_ARP_FROM_CTL, &flow,
- OFPFW_DL_TYPE | OFPFW_DL_DST | OFPFW_DL_SRC,
- OFPP_NORMAL);
-
- /* OpenFlow traffic to or from the controller.
- *
- * (A given field's value is completely ignored if it is wildcarded,
- * which is why we can get away with using a single 'flow' in each
- * case here.) */
- memset(&flow, 0, sizeof flow);
- flow.dl_type = htons(ETH_TYPE_IP);
- memcpy(flow.dl_src, controller_mac, ETH_ADDR_LEN);
- memcpy(flow.dl_dst, controller_mac, ETH_ADDR_LEN);
- flow.nw_proto = IP_TYPE_TCP;
- flow.tp_src = htons(OFP_TCP_PORT);
- flow.tp_dst = htons(OFP_TCP_PORT);
- setup_flow(in_band, IBR_TO_CTL_OFP_SRC, &flow,
- (OFPFW_DL_TYPE | OFPFW_DL_DST | OFPFW_NW_PROTO
- | OFPFW_TP_SRC), OFPP_NORMAL);
- setup_flow(in_band, IBR_TO_CTL_OFP_DST, &flow,
- (OFPFW_DL_TYPE | OFPFW_DL_DST | OFPFW_NW_PROTO
- | OFPFW_TP_DST), OFPP_NORMAL);
- setup_flow(in_band, IBR_FROM_CTL_OFP_SRC, &flow,
- (OFPFW_DL_TYPE | OFPFW_DL_SRC | OFPFW_NW_PROTO
- | OFPFW_TP_SRC), OFPP_NORMAL);
- setup_flow(in_band, IBR_FROM_CTL_OFP_DST, &flow,
- (OFPFW_DL_TYPE | OFPFW_DL_SRC | OFPFW_NW_PROTO
- | OFPFW_TP_DST), OFPP_NORMAL);
- } else {
- drop_flow(in_band, IBR_ARP_FROM_CTL);
- drop_flow(in_band, IBR_TO_CTL_OFP_DST);
- drop_flow(in_band, IBR_TO_CTL_OFP_SRC);
- drop_flow(in_band, IBR_FROM_CTL_OFP_DST);
- drop_flow(in_band, IBR_FROM_CTL_OFP_SRC);
+ /* Drop old rules. */
+ drop_rules(ib);
+
+ /* Figure out new rules. */
+ memcpy(ib->installed_local_mac, ib->local_mac, ETH_ADDR_LEN);
+ ib->remote_addrs = xmalloc(ib->n_remotes * sizeof *ib->remote_addrs);
+ ib->n_remote_addrs = 0;
+ ib->remote_macs = xmalloc(ib->n_remotes * ETH_ADDR_LEN);
+ ib->n_remote_macs = 0;
+ for (r = ib->remotes; r < &ib->remotes[ib->n_remotes]; r++) {
+ ib->remote_addrs[ib->n_remote_addrs++] = r->remote_addr;
+ if (!eth_addr_is_zero(r->remote_mac)) {
+ memcpy(&ib->remote_macs[ib->n_remote_macs * ETH_ADDR_LEN],
+ r->remote_mac, ETH_ADDR_LEN);
+ ib->n_remote_macs++;
+ }
}
+
+ /* Sort, to allow make_rules() to easily skip duplicates. */
+ qsort(ib->remote_addrs, ib->n_remote_addrs, sizeof *ib->remote_addrs,
+ compare_addrs);
+ qsort(ib->remote_macs, ib->n_remote_macs, ETH_ADDR_LEN, compare_macs);
+
+ /* Add new rules. */
+ add_rules(ib);
}
void
in_band_wait(struct in_band *in_band)
{
- time_t now = time_now();
- time_t wakeup = MIN(in_band->next_refresh, in_band->next_local_refresh);
- if (wakeup > now) {
- poll_timer_wait((wakeup - now) * 1000);
- } else {
- poll_immediate_wake();
- }
+ long long int wakeup
+ = MIN(in_band->next_remote_refresh, in_band->next_local_refresh);
+ poll_timer_wait_until(wakeup * 1000);
}
+/* ofproto has flushed all flows from the flow table and it is calling us back
+ * to allow us to reinstall the ones that are important to us. */
void
in_band_flushed(struct in_band *in_band)
{
- int i;
-
- for (i = 0; i < N_IB_RULES; i++) {
- in_band->rules[i].installed = false;
- }
+ add_rules(in_band);
}
int
-in_band_create(struct ofproto *ofproto,
- struct dpif *dpif, struct switch_status *ss,
- struct rconn *controller, struct in_band **in_bandp)
+in_band_create(struct ofproto *ofproto, struct dpif *dpif,
+ struct switch_status *ss, struct in_band **in_bandp)
{
struct in_band *in_band;
- struct netdev *netdev;
char local_name[IF_NAMESIZE];
+ struct netdev *local_netdev;
int error;
- *in_bandp = NULL;
error = dpif_port_get_name(dpif, ODPP_LOCAL,
local_name, sizeof local_name);
if (error) {
+ VLOG_ERR("failed to initialize in-band control: cannot get name "
+ "of datapath local port (%s)", strerror(error));
return error;
}
- error = netdev_open(local_name, NETDEV_ETH_TYPE_NONE, &netdev);
+ error = netdev_open_default(local_name, &local_netdev);
if (error) {
- VLOG_ERR("failed to open %s network device: %s",
- local_name, strerror(error));
+ VLOG_ERR("failed to initialize in-band control: cannot open "
+ "datapath local port %s (%s)", local_name, strerror(error));
return error;
}
- in_band = xcalloc(1, sizeof *in_band);
+ in_band = xzalloc(sizeof *in_band);
in_band->ofproto = ofproto;
- in_band->netdev = netdev;
- in_band->controller = controller;
in_band->ss_cat = switch_status_register(ss, "in-band",
in_band_status_cb, in_band);
- in_band->next_refresh = TIME_MIN;
+ in_band->next_remote_refresh = TIME_MIN;
in_band->next_local_refresh = TIME_MIN;
+ in_band->local_netdev = local_netdev;
*in_bandp = in_band;
+
return 0;
}
void
-in_band_destroy(struct in_band *in_band)
+in_band_destroy(struct in_band *ib)
{
- if (in_band) {
- netdev_close(in_band->netdev);
- switch_status_unregister(in_band->ss_cat);
- /* We don't own the rconn. */
+ if (ib) {
+ drop_rules(ib);
+ in_band_set_remotes(ib, NULL, 0);
+ switch_status_unregister(ib->ss_cat);
+ netdev_close(ib->local_netdev);
+ free(ib);
}
}
+static bool
+any_addresses_changed(struct in_band *ib,
+ const struct sockaddr_in *addresses, size_t n)
+{
+ size_t i;
+
+ if (n != ib->n_remotes) {
+ return true;
+ }
+
+ for (i = 0; i < n; i++) {
+ const struct sockaddr_in *old = &ib->remotes[i].remote_addr;
+ const struct sockaddr_in *new = &addresses[i];
+
+ if (old->sin_addr.s_addr != new->sin_addr.s_addr ||
+ old->sin_port != new->sin_port) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+void
+in_band_set_remotes(struct in_band *ib,
+ const struct sockaddr_in *addresses, size_t n)
+{
+ size_t i;
+
+ if (!any_addresses_changed(ib, addresses, n)) {
+ return;
+ }
+
+ /* Clear old remotes. */
+ for (i = 0; i < ib->n_remotes; i++) {
+ netdev_close(ib->remotes[i].remote_netdev);
+ }
+ free(ib->remotes);
+
+ /* Set up new remotes. */
+ ib->remotes = n ? xzalloc(n * sizeof *ib->remotes) : NULL;
+ ib->n_remotes = n;
+ for (i = 0; i < n; i++) {
+ ib->remotes[i].remote_addr = addresses[i];
+ }
+
+ /* Force refresh in next call to in_band_run(). */
+ ib->next_remote_refresh = TIME_MIN;
+}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff