From 0ade584ebe8ca1a1de92fb7422566726f276918c Mon Sep 17 00:00:00 2001 From: Ben Pfaff Date: Fri, 16 Apr 2010 13:50:51 -0700 Subject: [PATCH] in-band: Support an arbitrary number of controllers. --- ofproto/in-band.c | 713 ++++++++++++++++++++++++++++------------------ ofproto/in-band.h | 10 +- ofproto/ofproto.c | 9 +- 3 files changed, 456 insertions(+), 276 deletions(-) diff --git a/ofproto/in-band.c b/ofproto/in-band.c index 8e7f43073..82e51c726 100644 --- a/ofproto/in-band.c +++ b/ofproto/in-band.c @@ -193,10 +193,13 @@ * gateway. */ -#define IB_BASE_PRIORITY 18181800 - +/* 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_DHCP, /* (a) From local port, DHCP. */ + 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. */ IBR_TO_REMOTE_ARP, /* (d) To remote MAC, ARP. */ @@ -204,182 +207,193 @@ enum { IBR_TO_CTL_ARP, /* (f) To controller IP, ARP. */ IBR_FROM_CTL_ARP, /* (g) From controller IP, ARP. */ IBR_TO_CTL_OFP, /* (h) To controller, OpenFlow port. */ - IBR_FROM_CTL_OFP, /* (i) From controller, OpenFlow port. */ -#if OFP_TCP_PORT != OFP_SSL_PORT -#error Need to support separate TCP and SSL flows. -#endif - N_IB_RULES + IBR_FROM_CTL_OFP /* (i) From controller, OpenFlow 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 rconn *rconn; /* Connection to remote. */ + uint32_t remote_ip; /* Remote IP, 0 if unknown. */ + 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 rconn *controller; struct status_category *ss_cat; - /* Keep track of local port's information. */ - uint8_t local_mac[ETH_ADDR_LEN]; /* Current MAC. */ - struct netdev *local_netdev; /* Local port's network device. */ - time_t next_local_refresh; - - /* Keep track of controller and next hop's information. */ - uint32_t controller_ip; /* Controller IP, 0 if unknown. */ - uint8_t remote_mac[ETH_ADDR_LEN]; /* Remote MAC. */ - struct netdev *remote_netdev; - uint8_t last_remote_mac[ETH_ADDR_LEN]; /* Previous remote MAC. */ - time_t next_remote_refresh; - - /* Rules that we set up. */ - struct ib_rule rules[N_IB_RULES]; + /* Remote information. */ + time_t next_remote_refresh; /* Refresh timer. */ + struct in_band_remote *remotes; + size_t n_remotes; + + /* Local information. */ + time_t next_local_refresh; /* Refresh timer. */ + uint8_t local_mac[ETH_ADDR_LEN]; /* Current MAC. */ + 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]; + uint32_t *remote_ips; + uint32_t n_remote_ips; + 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_remote_mac(struct in_band *ib) +static int +refresh_remote(struct in_band *ib, struct in_band_remote *r) { - int retval; - bool have_mac; - struct in_addr c_in4; /* Controller's IP address. */ - struct in_addr r_in4; /* Next hop IP address. */ + struct in_addr remote_inaddr; + struct in_addr next_hop_inaddr; char *next_hop_dev; - time_t now = time_now(); + int retval; - if (now >= ib->next_remote_refresh) { - /* Find the next-hop IP address. */ - c_in4.s_addr = ib->controller_ip; - memset(ib->remote_mac, 0, sizeof ib->remote_mac); - retval = netdev_get_next_hop(ib->local_netdev, - &c_in4, &r_in4, &next_hop_dev); - if (retval) { - VLOG_WARN("cannot find route for controller ("IP_FMT"): %s", - IP_ARGS(&ib->controller_ip), strerror(retval)); - ib->next_remote_refresh = now + 1; - return NULL; - } - if (!r_in4.s_addr) { - r_in4.s_addr = c_in4.s_addr; - } + /* Get remote IP address. */ + r->remote_ip = rconn_get_remote_ip(r->rconn); + + /* Find the next-hop IP address. */ + remote_inaddr.s_addr = r->remote_ip; + memset(r->remote_mac, 0, sizeof r->remote_mac); + retval = netdev_get_next_hop(ib->local_netdev, &remote_inaddr, + &next_hop_inaddr, &next_hop_dev); + if (retval) { + VLOG_WARN("cannot find route for controller ("IP_FMT"): %s", + IP_ARGS(&r->remote_ip), strerror(retval)); + return 1; + } + if (!next_hop_inaddr.s_addr) { + next_hop_inaddr.s_addr = remote_inaddr.s_addr; + } - /* Get the next-hop IP and network device. */ - if (!ib->remote_netdev - || strcmp(netdev_get_name(ib->remote_netdev), next_hop_dev)) - { - netdev_close(ib->remote_netdev); - - retval = netdev_open_default(next_hop_dev, &ib->remote_netdev); - if (retval) { - VLOG_WARN_RL(&rl, "cannot open netdev %s (next hop " - "to controller "IP_FMT"): %s", - next_hop_dev, IP_ARGS(&ib->controller_ip), - strerror(retval)); - free(next_hop_dev); - ib->next_remote_refresh = now + 1; - return NULL; - } - } - free(next_hop_dev); + /* Get the next-hop IP and network device. */ + if (!r->remote_netdev + || strcmp(netdev_get_name(r->remote_netdev), next_hop_dev)) + { + netdev_close(r->remote_netdev); - /* Look up the MAC address of the next-hop IP address. */ - retval = netdev_arp_lookup(ib->remote_netdev, r_in4.s_addr, - ib->remote_mac); + retval = netdev_open_default(next_hop_dev, &r->remote_netdev); if (retval) { - VLOG_DBG_RL(&rl, "cannot look up remote MAC address ("IP_FMT"): %s", - IP_ARGS(&r_in4.s_addr), strerror(retval)); - } - have_mac = !eth_addr_is_zero(ib->remote_mac); - if (have_mac - && !eth_addr_equals(ib->last_remote_mac, ib->remote_mac)) { - VLOG_DBG("remote MAC address changed from "ETH_ADDR_FMT" to " - ETH_ADDR_FMT, - ETH_ADDR_ARGS(ib->last_remote_mac), - ETH_ADDR_ARGS(ib->remote_mac)); - memcpy(ib->last_remote_mac, ib->remote_mac, ETH_ADDR_LEN); + VLOG_WARN_RL(&rl, "cannot open netdev %s (next hop " + "to controller "IP_FMT"): %s", + next_hop_dev, IP_ARGS(&r->remote_ip), + strerror(retval)); + free(next_hop_dev); + return 1; } - - /* 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_remote_refresh - = now + (!ib->controller_ip || have_mac ? 10 : 1); + } + 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)); } - return !eth_addr_is_zero(ib->remote_mac) ? ib->remote_mac : NULL; + /* 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. */ + return r->remote_ip && 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 (ib->local_netdev && !netdev_get_etheraddr(ib->local_netdev, ea)) { - memcpy(ib->local_mac, ea, ETH_ADDR_LEN); + struct in_band_remote *r; + bool any_changes; + int min_refresh; + + if (time_now() < ib->next_remote_refresh) { + return false; + } + + any_changes = false; + min_refresh = 10; + for (r = ib->remotes; r < &ib->remotes[ib->n_remotes]; r++) { + uint8_t old_remote_mac[ETH_ADDR_LEN]; + uint32_t old_remote_ip; + int refresh_interval; + + /* Save old remote information. */ + old_remote_ip = r->remote_ip; + memcpy(old_remote_mac, r->remote_mac, ETH_ADDR_LEN); + + /* Refresh remote information. */ + refresh_interval = refresh_remote(ib, r); + min_refresh = MIN(min_refresh, refresh_interval); + + /* If anything changed, log the changes. */ + if (old_remote_ip != r->remote_ip) { + any_changes = true; + if (r->remote_ip) { + VLOG_DBG("remote IP address changed from "IP_FMT" to "IP_FMT, + IP_ARGS(&old_remote_ip), IP_ARGS(&r->remote_ip)); + } + } + 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; + ib->next_remote_refresh = time_now() + min_refresh; + + return any_changes; } -static void -in_band_status_cb(struct status_reply *sr, void *in_band_) +/* 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) { - struct in_band *in_band = in_band_; + uint8_t ea[ETH_ADDR_LEN]; + time_t now; - if (!eth_addr_is_zero(in_band->local_mac)) { - status_reply_put(sr, "local-mac="ETH_ADDR_FMT, - ETH_ADDR_ARGS(in_band->local_mac)); + now = time_now(); + if (now < ib->next_local_refresh) { + return false; } + ib->next_local_refresh = now + 1; - if (!eth_addr_is_zero(in_band->remote_mac)) { - status_reply_put(sr, "remote-mac="ETH_ADDR_FMT, - ETH_ADDR_ARGS(in_band->remote_mac)); + if (netdev_get_etheraddr(ib->local_netdev, ea) + || eth_addr_equals(ea, ib->local_mac)) { + return false; } -} -static void -drop_flow(struct in_band *in_band, int rule_idx) -{ - struct ib_rule *rule = &in_band->rules[rule_idx]; - - if (rule->installed) { - rule->installed = false; - ofproto_delete_flow(in_band->ofproto, &rule->flow, rule->wildcards, - rule->priority); - } + memcpy(ib->local_mac, ea, ETH_ADDR_LEN); + return true; } -/* out_port and fixed_fields are assumed never to change. */ static void -set_up_flow(struct in_band *in_band, int rule_idx, const flow_t *flow, - uint32_t fixed_fields, uint16_t out_port) +in_band_status_cb(struct status_reply *sr, void *in_band_) { - struct ib_rule *rule = &in_band->rules[rule_idx]; - - if (!rule->installed || memcmp(flow, &rule->flow, sizeof *flow)) { - union ofp_action action; - - drop_flow(in_band, rule_idx); + struct in_band *in_band = in_band_; - rule->installed = true; - rule->flow = *flow; - rule->wildcards = OVSFW_ALL & ~fixed_fields; - rule->priority = IB_BASE_PRIORITY + (N_IB_RULES - rule_idx); + if (!eth_addr_is_zero(in_band->local_mac)) { + status_reply_put(sr, "local-mac="ETH_ADDR_FMT, + ETH_ADDR_ARGS(in_band->local_mac)); + } - 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); + 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)); } } @@ -401,7 +415,6 @@ in_band_msg_in_hook(struct in_band *in_band, const flow_t *flow, && flow->tp_dst == htons(DHCP_CLIENT_PORT) && packet->l7) { struct dhcp_header *dhcp; - const uint8_t *local_mac; dhcp = ofpbuf_at(packet, (char *)packet->l7 - (char *)packet->data, sizeof *dhcp); @@ -409,8 +422,9 @@ in_band_msg_in_hook(struct in_band *in_band, const flow_t *flow, return false; } - local_mac = get_local_mac(in_band); - if (local_mac && eth_addr_equals(dhcp->chaddr, local_mac)) { + refresh_local(in_band); + if (!eth_addr_is_zero(in_band->local_mac) + && eth_addr_equals(dhcp->chaddr, in_band->local_mac)) { return true; } } @@ -448,136 +462,276 @@ in_band_rule_check(struct in_band *in_band, const flow_t *flow, return true; } -void -in_band_run(struct in_band *in_band) +static void +init_rule(struct in_band_rule *rule, unsigned int priority) { - time_t now = time_now(); - uint32_t controller_ip; - const uint8_t *remote_mac; - const uint8_t *local_mac; - flow_t flow; + rule->wildcards = OVSFW_ALL; + rule->priority = priority; - if (now < in_band->next_remote_refresh - && now < in_band->next_local_refresh) { - return; - } + /* Not strictly necessary but seems cleaner. */ + memset(&rule->flow, 0, sizeof rule->flow); +} - controller_ip = rconn_get_remote_ip(in_band->controller); - if (in_band->controller_ip && controller_ip != in_band->controller_ip) { - VLOG_DBG("controller IP address changed from "IP_FMT" to "IP_FMT, - IP_ARGS(&in_band->controller_ip), - IP_ARGS(&controller_ip)); - } - in_band->controller_ip = controller_ip; +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 = htons(dl_type); +} + +static void +set_dl_src(struct in_band_rule *rule, const uint8_t dl_src[ETH_ADDR_LEN]) +{ + 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 = htons(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 = htons(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; +} - remote_mac = get_remote_mac(in_band); - local_mac = get_local_mac(in_band); +static void +set_nw_src(struct in_band_rule *rule, uint32_t nw_src) +{ + rule->wildcards &= ~OFPFW_NW_SRC_MASK; + rule->flow.nw_src = nw_src; +} - if (local_mac) { +static void +set_nw_dst(struct in_band_rule *rule, uint32_t nw_dst) +{ + rule->wildcards &= ~OFPFW_NW_DST_MASK; + rule->flow.nw_dst = nw_dst; +} + +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)) { /* Allow DHCP requests to be sent from the local port. */ - memset(&flow, 0, sizeof flow); - flow.in_port = ODPP_LOCAL; - flow.dl_type = htons(ETH_TYPE_IP); - memcpy(flow.dl_src, local_mac, ETH_ADDR_LEN); - flow.nw_proto = IP_TYPE_UDP; - flow.tp_src = htons(DHCP_CLIENT_PORT); - flow.tp_dst = htons(DHCP_SERVER_PORT); - set_up_flow(in_band, IBR_FROM_LOCAL_DHCP, &flow, - (OFPFW_IN_PORT | OFPFW_DL_TYPE | OFPFW_DL_SRC - | OFPFW_NW_PROTO | OFPFW_TP_SRC | OFPFW_TP_DST), - OFPP_NORMAL); + init_rule(&rule, IBR_FROM_LOCAL_DHCP); + set_in_port(&rule, ODPP_LOCAL); + set_dl_type(&rule, ETH_TYPE_IP); + set_dl_src(&rule, ib->installed_local_mac); + set_nw_proto(&rule, IP_TYPE_UDP); + set_tp_src(&rule, DHCP_CLIENT_PORT); + set_tp_dst(&rule, DHCP_SERVER_PORT); + cb(ib, &rule); /* Allow the connection's interface to receive directed ARP traffic. */ - memset(&flow, 0, sizeof flow); - flow.dl_type = htons(ETH_TYPE_ARP); - memcpy(flow.dl_dst, local_mac, ETH_ADDR_LEN); - flow.nw_proto = ARP_OP_REPLY; - set_up_flow(in_band, IBR_TO_LOCAL_ARP, &flow, - (OFPFW_DL_TYPE | OFPFW_DL_DST | OFPFW_NW_PROTO), - OFPP_NORMAL); + init_rule(&rule, IBR_TO_LOCAL_ARP); + set_dl_type(&rule, ETH_TYPE_ARP); + set_dl_dst(&rule, ib->installed_local_mac); + set_nw_proto(&rule, ARP_OP_REPLY); + cb(ib, &rule); /* Allow the connection's interface to be the source of ARP traffic. */ - memset(&flow, 0, sizeof flow); - flow.dl_type = htons(ETH_TYPE_ARP); - memcpy(flow.dl_src, local_mac, ETH_ADDR_LEN); - flow.nw_proto = ARP_OP_REQUEST; - set_up_flow(in_band, IBR_FROM_LOCAL_ARP, &flow, - (OFPFW_DL_TYPE | OFPFW_DL_SRC | OFPFW_NW_PROTO), - OFPP_NORMAL); - } else { - drop_flow(in_band, IBR_FROM_LOCAL_DHCP); - drop_flow(in_band, IBR_TO_LOCAL_ARP); - drop_flow(in_band, IBR_FROM_LOCAL_ARP); + init_rule(&rule, IBR_FROM_LOCAL_ARP); + set_dl_type(&rule, ETH_TYPE_ARP); + set_dl_src(&rule, ib->installed_local_mac); + set_nw_proto(&rule, ARP_OP_REQUEST); + cb(ib, &rule); } - if (remote_mac) { + 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; + } + } + /* Allow ARP replies to the remote side's MAC. */ - memset(&flow, 0, sizeof flow); - flow.dl_type = htons(ETH_TYPE_ARP); - memcpy(flow.dl_dst, remote_mac, ETH_ADDR_LEN); - flow.nw_proto = ARP_OP_REPLY; - set_up_flow(in_band, IBR_TO_REMOTE_ARP, &flow, - (OFPFW_DL_TYPE | OFPFW_DL_DST | OFPFW_NW_PROTO), - OFPP_NORMAL); - - /* Allow ARP requests from the remote side's MAC. */ - memset(&flow, 0, sizeof flow); - flow.dl_type = htons(ETH_TYPE_ARP); - memcpy(flow.dl_src, remote_mac, ETH_ADDR_LEN); - flow.nw_proto = ARP_OP_REQUEST; - set_up_flow(in_band, IBR_FROM_REMOTE_ARP, &flow, - (OFPFW_DL_TYPE | OFPFW_DL_SRC | OFPFW_NW_PROTO), - OFPP_NORMAL); - } else { - drop_flow(in_band, IBR_TO_REMOTE_ARP); - drop_flow(in_band, IBR_FROM_REMOTE_ARP); + init_rule(&rule, IBR_TO_REMOTE_ARP); + set_dl_type(&rule, ETH_TYPE_ARP); + set_dl_dst(&rule, remote_mac); + set_nw_proto(&rule, ARP_OP_REPLY); + cb(ib, &rule); + + /* Allow ARP requests from the remote side's MAC. */ + init_rule(&rule, IBR_FROM_REMOTE_ARP); + set_dl_type(&rule, ETH_TYPE_ARP); + set_dl_src(&rule, remote_mac); + set_nw_proto(&rule, ARP_OP_REQUEST); + cb(ib, &rule); } - if (controller_ip) { + for (i = 0; i < ib->n_remote_ips; i++) { + uint32_t remote_ip = ib->remote_ips[i]; + + if (i > 0 && ib->remote_ips[i - 1] == remote_ip) { + /* Skip duplicates. */ + continue; + } + /* Allow ARP replies to the controller's IP. */ - memset(&flow, 0, sizeof flow); - flow.dl_type = htons(ETH_TYPE_ARP); - flow.nw_proto = ARP_OP_REPLY; - flow.nw_dst = controller_ip; - set_up_flow(in_band, IBR_TO_CTL_ARP, &flow, - (OFPFW_DL_TYPE | OFPFW_NW_PROTO | OFPFW_NW_DST_MASK), - OFPP_NORMAL); - - /* Allow ARP requests from the controller's IP. */ - memset(&flow, 0, sizeof flow); - flow.dl_type = htons(ETH_TYPE_ARP); - flow.nw_proto = ARP_OP_REQUEST; - flow.nw_src = controller_ip; - set_up_flow(in_band, IBR_FROM_CTL_ARP, &flow, - (OFPFW_DL_TYPE | OFPFW_NW_PROTO | OFPFW_NW_SRC_MASK), - 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); - flow.nw_proto = IP_TYPE_TCP; - flow.nw_src = controller_ip; - flow.nw_dst = controller_ip; - flow.tp_src = htons(OFP_TCP_PORT); - flow.tp_dst = htons(OFP_TCP_PORT); - set_up_flow(in_band, IBR_TO_CTL_OFP, &flow, - (OFPFW_DL_TYPE | OFPFW_NW_PROTO | OFPFW_NW_DST_MASK - | OFPFW_TP_DST), OFPP_NORMAL); - set_up_flow(in_band, IBR_FROM_CTL_OFP, &flow, - (OFPFW_DL_TYPE | OFPFW_NW_PROTO | OFPFW_NW_SRC_MASK - | OFPFW_TP_SRC), OFPP_NORMAL); - } else { - drop_flow(in_band, IBR_TO_CTL_ARP); - drop_flow(in_band, IBR_FROM_CTL_ARP); - drop_flow(in_band, IBR_TO_CTL_OFP); - drop_flow(in_band, IBR_FROM_CTL_OFP); + init_rule(&rule, IBR_TO_CTL_ARP); + set_dl_type(&rule, ETH_TYPE_ARP); + set_nw_proto(&rule, ARP_OP_REPLY); + set_nw_dst(&rule, remote_ip); + cb(ib, &rule); + + /* Allow ARP requests from the controller's IP. */ + init_rule(&rule, IBR_FROM_CTL_ARP); + set_dl_type(&rule, ETH_TYPE_ARP); + set_nw_proto(&rule, ARP_OP_REQUEST); + set_nw_src(&rule, remote_ip); + cb(ib, &rule); + + /* OpenFlow traffic to the controller. */ + init_rule(&rule, IBR_TO_CTL_OFP); + set_dl_type(&rule, ETH_TYPE_IP); + set_nw_proto(&rule, IP_TYPE_TCP); + set_nw_dst(&rule, remote_ip); + set_tp_dst(&rule, OFP_TCP_PORT); + cb(ib, &rule); + + /* OpenFlow traffic from the controller. */ + init_rule(&rule, IBR_FROM_CTL_OFP); + set_dl_type(&rule, ETH_TYPE_IP); + set_nw_proto(&rule, IP_TYPE_TCP); + set_nw_src(&rule, remote_ip); + set_tp_src(&rule, OFP_TCP_PORT); + cb(ib, &rule); } } +static void +clear_rules(struct in_band *ib) +{ + memset(ib->installed_local_mac, 0, sizeof ib->installed_local_mac); + + free(ib->remote_ips); + ib->remote_ips = NULL; + ib->n_remote_ips = 0; + + free(ib->remote_macs); + ib->remote_macs = NULL; + ib->n_remote_macs = 0; +} + +static void +drop_rule(struct in_band *ib, const struct in_band_rule *rule) +{ + ofproto_delete_flow(ib->ofproto, &rule->flow, + rule->wildcards, rule->priority); +} + +static void +drop_rules(struct in_band *ib) +{ + make_rules(ib, drop_rule); + clear_rules(ib); +} + +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); +} + +static void +add_rules(struct in_band *ib) +{ + make_rules(ib, add_rule); +} + +static int +compare_ips(const void *a, const void *b) +{ + return memcmp(a, b, sizeof(uint32_t)); +} + +static int +compare_macs(const void *a, const void *b) +{ + return memcmp(a, b, ETH_ADDR_LEN); +} + +void +in_band_run(struct in_band *ib) +{ + struct in_band_remote *r; + + if (!refresh_local(ib) && !refresh_remotes(ib)) { + /* Nothing changed, nothing to do. */ + return; + } + + /* Drop old rules. */ + drop_rules(ib); + + /* Figure out new rules. */ + memcpy(ib->installed_local_mac, ib->local_mac, ETH_ADDR_LEN); + ib->remote_ips = xmalloc(ib->n_remotes * sizeof *ib->remote_ips); + ib->n_remote_ips = 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++) { + if (r->remote_ip) { + ib->remote_ips[ib->n_remote_ips++] = r->remote_ip; + } + 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_ips, ib->n_remote_ips, sizeof *ib->remote_ips, + compare_ips); + 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) { @@ -594,17 +748,12 @@ in_band_wait(struct in_band *in_band) 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; - } + clear_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) + struct switch_status *ss, struct in_band **in_bandp) { struct in_band *in_band; char local_name[IF_NAMESIZE]; @@ -628,13 +777,11 @@ in_band_create(struct ofproto *ofproto, struct dpif *dpif, in_band = xzalloc(sizeof *in_band); in_band->ofproto = ofproto; - in_band->controller = controller; in_band->ss_cat = switch_status_register(ss, "in-band", in_band_status_cb, in_band); - in_band->local_netdev = local_netdev; - in_band->next_local_refresh = TIME_MIN; - in_band->remote_netdev = NULL; in_band->next_remote_refresh = TIME_MIN; + in_band->next_local_refresh = TIME_MIN; + in_band->local_netdev = local_netdev; *in_bandp = in_band; @@ -642,20 +789,44 @@ in_band_create(struct ofproto *ofproto, struct dpif *dpif, } void -in_band_destroy(struct in_band *in_band) +in_band_destroy(struct in_band *ib) { - if (in_band) { - int i; + 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); + } +} - for (i = 0; i < N_IB_RULES; i++) { - drop_flow(in_band, i); +void +in_band_set_remotes(struct in_band *ib, struct rconn **remotes, size_t n) +{ + size_t i; + + /* Optimize the case where the rconns are the same as last time. */ + if (n == ib->n_remotes) { + for (i = 0; i < n; i++) { + if (ib->remotes[i].rconn != remotes[i]) { + goto different; + } } + return; - switch_status_unregister(in_band->ss_cat); - netdev_close(in_band->local_netdev); - netdev_close(in_band->remote_netdev); + different:; + } + + for (i = 0; i < ib->n_remotes; i++) { /* We don't own the rconn. */ - free(in_band); + netdev_close(ib->remotes[i].remote_netdev); } -} + free(ib->remotes); + ib->next_remote_refresh = TIME_MIN; + ib->remotes = n ? xzalloc(n * sizeof *ib->remotes) : 0; + ib->n_remotes = n; + for (i = 0; i < n; i++) { + ib->remotes[i].rconn = remotes[i]; + } +} diff --git a/ofproto/in-band.h b/ofproto/in-band.h index ddbc5e563..80730d3f8 100644 --- a/ofproto/in-band.h +++ b/ofproto/in-band.h @@ -1,5 +1,5 @@ /* - * 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. @@ -28,14 +28,18 @@ struct settings; struct switch_status; int in_band_create(struct ofproto *, struct dpif *, struct switch_status *, - struct rconn *controller, struct in_band **); + struct in_band **); void in_band_destroy(struct in_band *); + +void in_band_set_remotes(struct in_band *, struct rconn **, size_t n); + void in_band_run(struct in_band *); +void in_band_wait(struct in_band *); + bool in_band_msg_in_hook(struct in_band *, const flow_t *, const struct ofpbuf *packet); bool in_band_rule_check(struct in_band *, const flow_t *, const struct odp_actions *); -void in_band_wait(struct in_band *); void in_band_flushed(struct in_band *); #endif /* in-band.h */ diff --git a/ofproto/ofproto.c b/ofproto/ofproto.c index ba9ef1903..c5bac6bd9 100644 --- a/ofproto/ofproto.c +++ b/ofproto/ofproto.c @@ -448,8 +448,13 @@ ofproto_set_in_band(struct ofproto *p, bool in_band) { if (in_band != (p->in_band != NULL)) { if (in_band) { - return in_band_create(p, p->dpif, p->switch_status, - p->controller->rconn, &p->in_band); + int error; + + error = in_band_create(p, p->dpif, p->switch_status, &p->in_band); + if (error) { + return error; + } + in_band_set_remotes(p->in_band, &p->controller->rconn, 1); } else { ofproto_set_discovery(p, false, NULL, true); in_band_destroy(p->in_band); -- 2.43.0