/* Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include "ofproto/ofproto-dpif-xlate.h" #include "bfd.h" #include "bitmap.h" #include "bond.h" #include "bundle.h" #include "byte-order.h" #include "cfm.h" #include "connmgr.h" #include "coverage.h" #include "dpif.h" #include "dynamic-string.h" #include "in-band.h" #include "lacp.h" #include "learn.h" #include "mac-learning.h" #include "meta-flow.h" #include "multipath.h" #include "netdev-vport.h" #include "netlink.h" #include "nx-match.h" #include "odp-execute.h" #include "ofp-actions.h" #include "ofproto/ofproto-dpif-ipfix.h" #include "ofproto/ofproto-dpif-sflow.h" #include "ofproto/ofproto-dpif.h" #include "tunnel.h" #include "vlog.h" COVERAGE_DEFINE(ofproto_dpif_xlate); VLOG_DEFINE_THIS_MODULE(ofproto_dpif_xlate); /* Maximum depth of flow table recursion (due to resubmit actions) in a * flow translation. */ #define MAX_RESUBMIT_RECURSION 64 struct xlate_ctx { struct xlate_in *xin; struct xlate_out *xout; struct ofproto_dpif *ofproto; /* Flow at the last commit. */ struct flow base_flow; /* Tunnel IP destination address as received. This is stored separately * as the base_flow.tunnel is cleared on init to reflect the datapath * behavior. Used to make sure not to send tunneled output to ourselves, * which might lead to an infinite loop. This could happen easily * if a tunnel is marked as 'ip_remote=flow', and the flow does not * actually set the tun_dst field. */ ovs_be32 orig_tunnel_ip_dst; /* Stack for the push and pop actions. Each stack element is of type * "union mf_subvalue". */ union mf_subvalue init_stack[1024 / sizeof(union mf_subvalue)]; struct ofpbuf stack; /* The rule that we are currently translating, or NULL. */ struct rule_dpif *rule; int recurse; /* Recursion level, via xlate_table_action. */ bool max_resubmit_trigger; /* Recursed too deeply during translation. */ uint32_t orig_skb_priority; /* Priority when packet arrived. */ uint8_t table_id; /* OpenFlow table ID where flow was found. */ uint32_t sflow_n_outputs; /* Number of output ports. */ odp_port_t sflow_odp_port; /* Output port for composing sFlow action. */ uint16_t user_cookie_offset;/* Used for user_action_cookie fixup. */ bool exit; /* No further actions should be processed. */ }; /* A controller may use OFPP_NONE as the ingress port to indicate that * it did not arrive on a "real" port. 'ofpp_none_bundle' exists for * when an input bundle is needed for validation (e.g., mirroring or * OFPP_NORMAL processing). It is not connected to an 'ofproto' or have * any 'port' structs, so care must be taken when dealing with it. */ static struct ofbundle ofpp_none_bundle = { .name = "OFPP_NONE", .vlan_mode = PORT_VLAN_TRUNK }; static bool may_receive(const struct ofport_dpif *, struct xlate_ctx *); static void do_xlate_actions(const struct ofpact *, size_t ofpacts_len, struct xlate_ctx *); static void xlate_normal(struct xlate_ctx *); static void xlate_report(struct xlate_ctx *, const char *); static void xlate_table_action(struct xlate_ctx *, ofp_port_t in_port, uint8_t table_id, bool may_packet_in); static bool input_vid_is_valid(uint16_t vid, struct ofbundle *, bool warn); static uint16_t input_vid_to_vlan(const struct ofbundle *, uint16_t vid); static void output_normal(struct xlate_ctx *, const struct ofbundle *, uint16_t vlan); static void compose_output_action(struct xlate_ctx *, ofp_port_t ofp_port); static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); static bool ofbundle_trunks_vlan(const struct ofbundle *bundle, uint16_t vlan) { return (bundle->vlan_mode != PORT_VLAN_ACCESS && (!bundle->trunks || bitmap_is_set(bundle->trunks, vlan))); } static bool ofbundle_includes_vlan(const struct ofbundle *bundle, uint16_t vlan) { return vlan == bundle->vlan || ofbundle_trunks_vlan(bundle, vlan); } static bool vlan_is_mirrored(const struct ofmirror *m, int vlan) { return !m->vlans || bitmap_is_set(m->vlans, vlan); } static struct ofbundle * lookup_input_bundle(const struct ofproto_dpif *ofproto, ofp_port_t in_port, bool warn, struct ofport_dpif **in_ofportp) { struct ofport_dpif *ofport; /* Find the port and bundle for the received packet. */ ofport = get_ofp_port(ofproto, in_port); if (in_ofportp) { *in_ofportp = ofport; } if (ofport && ofport->bundle) { return ofport->bundle; } /* Special-case OFPP_NONE, which a controller may use as the ingress * port for traffic that it is sourcing. */ if (in_port == OFPP_NONE) { return &ofpp_none_bundle; } /* Odd. A few possible reasons here: * * - We deleted a port but there are still a few packets queued up * from it. * * - Someone externally added a port (e.g. "ovs-dpctl add-if") that * we don't know about. * * - The ofproto client didn't configure the port as part of a bundle. * This is particularly likely to happen if a packet was received on the * port after it was created, but before the client had a chance to * configure its bundle. */ if (warn) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: received packet on unknown " "port %"PRIu16, ofproto->up.name, in_port); } return NULL; } static void add_mirror_actions(struct xlate_ctx *ctx, const struct flow *orig_flow) { struct ofproto_dpif *ofproto = ctx->ofproto; mirror_mask_t mirrors; struct ofbundle *in_bundle; uint16_t vlan; uint16_t vid; const struct nlattr *a; size_t left; in_bundle = lookup_input_bundle(ctx->ofproto, orig_flow->in_port.ofp_port, ctx->xin->packet != NULL, NULL); if (!in_bundle) { return; } mirrors = in_bundle->src_mirrors; /* Drop frames on bundles reserved for mirroring. */ if (in_bundle->mirror_out) { if (ctx->xin->packet != NULL) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: dropping packet received on port " "%s, which is reserved exclusively for mirroring", ctx->ofproto->up.name, in_bundle->name); } return; } /* Check VLAN. */ vid = vlan_tci_to_vid(orig_flow->vlan_tci); if (!input_vid_is_valid(vid, in_bundle, ctx->xin->packet != NULL)) { return; } vlan = input_vid_to_vlan(in_bundle, vid); /* Look at the output ports to check for destination selections. */ NL_ATTR_FOR_EACH (a, left, ctx->xout->odp_actions.data, ctx->xout->odp_actions.size) { enum ovs_action_attr type = nl_attr_type(a); struct ofport_dpif *ofport; if (type != OVS_ACTION_ATTR_OUTPUT) { continue; } ofport = get_odp_port(ofproto, nl_attr_get_odp_port(a)); if (ofport && ofport->bundle) { mirrors |= ofport->bundle->dst_mirrors; } } if (!mirrors) { return; } /* Restore the original packet before adding the mirror actions. */ ctx->xin->flow = *orig_flow; while (mirrors) { struct ofmirror *m; m = ofproto->mirrors[mirror_mask_ffs(mirrors) - 1]; if (m->vlans) { ctx->xout->wc.masks.vlan_tci |= htons(VLAN_CFI | VLAN_VID_MASK); } if (!vlan_is_mirrored(m, vlan)) { mirrors = zero_rightmost_1bit(mirrors); continue; } mirrors &= ~m->dup_mirrors; ctx->xout->mirrors |= m->dup_mirrors; if (m->out) { output_normal(ctx, m->out, vlan); } else if (vlan != m->out_vlan && !eth_addr_is_reserved(orig_flow->dl_dst)) { struct ofbundle *bundle; HMAP_FOR_EACH (bundle, hmap_node, &ofproto->bundles) { if (ofbundle_includes_vlan(bundle, m->out_vlan) && !bundle->mirror_out) { output_normal(ctx, bundle, m->out_vlan); } } } } } /* Given 'vid', the VID obtained from the 802.1Q header that was received as * part of a packet (specify 0 if there was no 802.1Q header), and 'in_bundle', * the bundle on which the packet was received, returns the VLAN to which the * packet belongs. * * Both 'vid' and the return value are in the range 0...4095. */ static uint16_t input_vid_to_vlan(const struct ofbundle *in_bundle, uint16_t vid) { switch (in_bundle->vlan_mode) { case PORT_VLAN_ACCESS: return in_bundle->vlan; break; case PORT_VLAN_TRUNK: return vid; case PORT_VLAN_NATIVE_UNTAGGED: case PORT_VLAN_NATIVE_TAGGED: return vid ? vid : in_bundle->vlan; default: NOT_REACHED(); } } /* Checks whether a packet with the given 'vid' may ingress on 'in_bundle'. * If so, returns true. Otherwise, returns false and, if 'warn' is true, logs * a warning. * * 'vid' should be the VID obtained from the 802.1Q header that was received as * part of a packet (specify 0 if there was no 802.1Q header), in the range * 0...4095. */ static bool input_vid_is_valid(uint16_t vid, struct ofbundle *in_bundle, bool warn) { /* Allow any VID on the OFPP_NONE port. */ if (in_bundle == &ofpp_none_bundle) { return true; } switch (in_bundle->vlan_mode) { case PORT_VLAN_ACCESS: if (vid) { if (warn) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: dropping VLAN %"PRIu16" tagged " "packet received on port %s configured as VLAN " "%"PRIu16" access port", in_bundle->ofproto->up.name, vid, in_bundle->name, in_bundle->vlan); } return false; } return true; case PORT_VLAN_NATIVE_UNTAGGED: case PORT_VLAN_NATIVE_TAGGED: if (!vid) { /* Port must always carry its native VLAN. */ return true; } /* Fall through. */ case PORT_VLAN_TRUNK: if (!ofbundle_includes_vlan(in_bundle, vid)) { if (warn) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: dropping VLAN %"PRIu16" packet " "received on port %s not configured for trunking " "VLAN %"PRIu16, in_bundle->ofproto->up.name, vid, in_bundle->name, vid); } return false; } return true; default: NOT_REACHED(); } } /* Given 'vlan', the VLAN that a packet belongs to, and * 'out_bundle', a bundle on which the packet is to be output, returns the VID * that should be included in the 802.1Q header. (If the return value is 0, * then the 802.1Q header should only be included in the packet if there is a * nonzero PCP.) * * Both 'vlan' and the return value are in the range 0...4095. */ static uint16_t output_vlan_to_vid(const struct ofbundle *out_bundle, uint16_t vlan) { switch (out_bundle->vlan_mode) { case PORT_VLAN_ACCESS: return 0; case PORT_VLAN_TRUNK: case PORT_VLAN_NATIVE_TAGGED: return vlan; case PORT_VLAN_NATIVE_UNTAGGED: return vlan == out_bundle->vlan ? 0 : vlan; default: NOT_REACHED(); } } static void output_normal(struct xlate_ctx *ctx, const struct ofbundle *out_bundle, uint16_t vlan) { ovs_be16 *flow_tci = &ctx->xin->flow.vlan_tci; struct ofport_dpif *port; uint16_t vid; ovs_be16 tci, old_tci; vid = output_vlan_to_vid(out_bundle, vlan); if (!out_bundle->bond) { port = ofbundle_get_a_port(out_bundle); } else { port = bond_choose_output_slave(out_bundle->bond, &ctx->xin->flow, &ctx->xout->wc, vid, &ctx->xout->tags); if (!port) { /* No slaves enabled, so drop packet. */ return; } } old_tci = *flow_tci; tci = htons(vid); if (tci || out_bundle->use_priority_tags) { tci |= *flow_tci & htons(VLAN_PCP_MASK); if (tci) { tci |= htons(VLAN_CFI); } } *flow_tci = tci; compose_output_action(ctx, port->up.ofp_port); *flow_tci = old_tci; } /* A VM broadcasts a gratuitous ARP to indicate that it has resumed after * migration. Older Citrix-patched Linux DomU used gratuitous ARP replies to * indicate this; newer upstream kernels use gratuitous ARP requests. */ static bool is_gratuitous_arp(const struct flow *flow, struct flow_wildcards *wc) { if (flow->dl_type != htons(ETH_TYPE_ARP)) { return false; } memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst); if (!eth_addr_is_broadcast(flow->dl_dst)) { return false; } memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto); if (flow->nw_proto == ARP_OP_REPLY) { return true; } else if (flow->nw_proto == ARP_OP_REQUEST) { memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src); memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst); return flow->nw_src == flow->nw_dst; } else { return false; } } static void update_learning_table(struct ofproto_dpif *ofproto, const struct flow *flow, struct flow_wildcards *wc, int vlan, struct ofbundle *in_bundle) { struct mac_entry *mac; /* Don't learn the OFPP_NONE port. */ if (in_bundle == &ofpp_none_bundle) { return; } if (!mac_learning_may_learn(ofproto->ml, flow->dl_src, vlan)) { return; } mac = mac_learning_insert(ofproto->ml, flow->dl_src, vlan); if (is_gratuitous_arp(flow, wc)) { /* We don't want to learn from gratuitous ARP packets that are * reflected back over bond slaves so we lock the learning table. */ if (!in_bundle->bond) { mac_entry_set_grat_arp_lock(mac); } else if (mac_entry_is_grat_arp_locked(mac)) { return; } } if (mac_entry_is_new(mac) || mac->port.p != in_bundle) { /* The log messages here could actually be useful in debugging, * so keep the rate limit relatively high. */ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(30, 300); VLOG_DBG_RL(&rl, "bridge %s: learned that "ETH_ADDR_FMT" is " "on port %s in VLAN %d", ofproto->up.name, ETH_ADDR_ARGS(flow->dl_src), in_bundle->name, vlan); mac->port.p = in_bundle; mac_learning_changed(ofproto->ml, mac); } } /* Determines whether packets in 'flow' within 'ofproto' should be forwarded or * dropped. Returns true if they may be forwarded, false if they should be * dropped. * * 'in_port' must be the ofport_dpif that corresponds to flow->in_port. * 'in_port' must be part of a bundle (e.g. in_port->bundle must be nonnull). * * 'vlan' must be the VLAN that corresponds to flow->vlan_tci on 'in_port', as * returned by input_vid_to_vlan(). It must be a valid VLAN for 'in_port', as * checked by input_vid_is_valid(). * * May also add tags to '*tags', although the current implementation only does * so in one special case. */ static bool is_admissible(struct xlate_ctx *ctx, struct ofport_dpif *in_port, uint16_t vlan) { struct ofproto_dpif *ofproto = ctx->ofproto; struct flow *flow = &ctx->xin->flow; struct ofbundle *in_bundle = in_port->bundle; /* Drop frames for reserved multicast addresses * only if forward_bpdu option is absent. */ if (!ofproto->up.forward_bpdu && eth_addr_is_reserved(flow->dl_dst)) { xlate_report(ctx, "packet has reserved destination MAC, dropping"); return false; } if (in_bundle->bond) { struct mac_entry *mac; switch (bond_check_admissibility(in_bundle->bond, in_port, flow->dl_dst, &ctx->xout->tags)) { case BV_ACCEPT: break; case BV_DROP: xlate_report(ctx, "bonding refused admissibility, dropping"); return false; case BV_DROP_IF_MOVED: mac = mac_learning_lookup(ofproto->ml, flow->dl_src, vlan, NULL); if (mac && mac->port.p != in_bundle && (!is_gratuitous_arp(flow, &ctx->xout->wc) || mac_entry_is_grat_arp_locked(mac))) { xlate_report(ctx, "SLB bond thinks this packet looped back, " "dropping"); return false; } break; } } return true; } static void xlate_normal(struct xlate_ctx *ctx) { struct flow_wildcards *wc = &ctx->xout->wc; struct flow *flow = &ctx->xin->flow; struct ofport_dpif *in_port; struct ofbundle *in_bundle; struct mac_entry *mac; uint16_t vlan; uint16_t vid; ctx->xout->has_normal = true; memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src); memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst); wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI); in_bundle = lookup_input_bundle(ctx->ofproto, flow->in_port.ofp_port, ctx->xin->packet != NULL, &in_port); if (!in_bundle) { xlate_report(ctx, "no input bundle, dropping"); return; } /* Drop malformed frames. */ if (flow->dl_type == htons(ETH_TYPE_VLAN) && !(flow->vlan_tci & htons(VLAN_CFI))) { if (ctx->xin->packet != NULL) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: dropping packet with partial " "VLAN tag received on port %s", ctx->ofproto->up.name, in_bundle->name); } xlate_report(ctx, "partial VLAN tag, dropping"); return; } /* Drop frames on bundles reserved for mirroring. */ if (in_bundle->mirror_out) { if (ctx->xin->packet != NULL) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: dropping packet received on port " "%s, which is reserved exclusively for mirroring", ctx->ofproto->up.name, in_bundle->name); } xlate_report(ctx, "input port is mirror output port, dropping"); return; } /* Check VLAN. */ vid = vlan_tci_to_vid(flow->vlan_tci); if (!input_vid_is_valid(vid, in_bundle, ctx->xin->packet != NULL)) { xlate_report(ctx, "disallowed VLAN VID for this input port, dropping"); return; } vlan = input_vid_to_vlan(in_bundle, vid); /* Check other admissibility requirements. */ if (in_port && !is_admissible(ctx, in_port, vlan)) { return; } /* Learn source MAC. */ if (ctx->xin->may_learn) { update_learning_table(ctx->ofproto, flow, wc, vlan, in_bundle); } /* Determine output bundle. */ mac = mac_learning_lookup(ctx->ofproto->ml, flow->dl_dst, vlan, &ctx->xout->tags); if (mac) { if (mac->port.p != in_bundle) { xlate_report(ctx, "forwarding to learned port"); output_normal(ctx, mac->port.p, vlan); } else { xlate_report(ctx, "learned port is input port, dropping"); } } else { struct ofbundle *bundle; xlate_report(ctx, "no learned MAC for destination, flooding"); HMAP_FOR_EACH (bundle, hmap_node, &ctx->ofproto->bundles) { if (bundle != in_bundle && ofbundle_includes_vlan(bundle, vlan) && bundle->floodable && !bundle->mirror_out) { output_normal(ctx, bundle, vlan); } } ctx->xout->nf_output_iface = NF_OUT_FLOOD; } } /* Compose SAMPLE action for sFlow or IPFIX. The given probability is * the number of packets out of UINT32_MAX to sample. The given * cookie is passed back in the callback for each sampled packet. */ static size_t compose_sample_action(const struct ofproto_dpif *ofproto, struct ofpbuf *odp_actions, const struct flow *flow, const uint32_t probability, const union user_action_cookie *cookie, const size_t cookie_size) { size_t sample_offset, actions_offset; int cookie_offset; sample_offset = nl_msg_start_nested(odp_actions, OVS_ACTION_ATTR_SAMPLE); nl_msg_put_u32(odp_actions, OVS_SAMPLE_ATTR_PROBABILITY, probability); actions_offset = nl_msg_start_nested(odp_actions, OVS_SAMPLE_ATTR_ACTIONS); cookie_offset = put_userspace_action(ofproto, odp_actions, flow, cookie, cookie_size); nl_msg_end_nested(odp_actions, actions_offset); nl_msg_end_nested(odp_actions, sample_offset); return cookie_offset; } static void compose_sflow_cookie(const struct ofproto_dpif *ofproto, ovs_be16 vlan_tci, odp_port_t odp_port, unsigned int n_outputs, union user_action_cookie *cookie) { int ifindex; cookie->type = USER_ACTION_COOKIE_SFLOW; cookie->sflow.vlan_tci = vlan_tci; /* See http://www.sflow.org/sflow_version_5.txt (search for "Input/output * port information") for the interpretation of cookie->output. */ switch (n_outputs) { case 0: /* 0x40000000 | 256 means "packet dropped for unknown reason". */ cookie->sflow.output = 0x40000000 | 256; break; case 1: ifindex = dpif_sflow_odp_port_to_ifindex(ofproto->sflow, odp_port); if (ifindex) { cookie->sflow.output = ifindex; break; } /* Fall through. */ default: /* 0x80000000 means "multiple output ports. */ cookie->sflow.output = 0x80000000 | n_outputs; break; } } /* Compose SAMPLE action for sFlow bridge sampling. */ static size_t compose_sflow_action(const struct ofproto_dpif *ofproto, struct ofpbuf *odp_actions, const struct flow *flow, odp_port_t odp_port) { uint32_t probability; union user_action_cookie cookie; if (!ofproto->sflow || flow->in_port.ofp_port == OFPP_NONE) { return 0; } probability = dpif_sflow_get_probability(ofproto->sflow); compose_sflow_cookie(ofproto, htons(0), odp_port, odp_port == ODPP_NONE ? 0 : 1, &cookie); return compose_sample_action(ofproto, odp_actions, flow, probability, &cookie, sizeof cookie.sflow); } static void compose_flow_sample_cookie(uint16_t probability, uint32_t collector_set_id, uint32_t obs_domain_id, uint32_t obs_point_id, union user_action_cookie *cookie) { cookie->type = USER_ACTION_COOKIE_FLOW_SAMPLE; cookie->flow_sample.probability = probability; cookie->flow_sample.collector_set_id = collector_set_id; cookie->flow_sample.obs_domain_id = obs_domain_id; cookie->flow_sample.obs_point_id = obs_point_id; } static void compose_ipfix_cookie(union user_action_cookie *cookie) { cookie->type = USER_ACTION_COOKIE_IPFIX; } /* Compose SAMPLE action for IPFIX bridge sampling. */ static void compose_ipfix_action(const struct ofproto_dpif *ofproto, struct ofpbuf *odp_actions, const struct flow *flow) { uint32_t probability; union user_action_cookie cookie; if (!ofproto->ipfix || flow->in_port.ofp_port == OFPP_NONE) { return; } probability = dpif_ipfix_get_bridge_exporter_probability(ofproto->ipfix); compose_ipfix_cookie(&cookie); compose_sample_action(ofproto, odp_actions, flow, probability, &cookie, sizeof cookie.ipfix); } /* SAMPLE action for sFlow must be first action in any given list of * actions. At this point we do not have all information required to * build it. So try to build sample action as complete as possible. */ static void add_sflow_action(struct xlate_ctx *ctx) { ctx->user_cookie_offset = compose_sflow_action(ctx->ofproto, &ctx->xout->odp_actions, &ctx->xin->flow, ODPP_NONE); ctx->sflow_odp_port = 0; ctx->sflow_n_outputs = 0; } /* SAMPLE action for IPFIX must be 1st or 2nd action in any given list * of actions, eventually after the SAMPLE action for sFlow. */ static void add_ipfix_action(struct xlate_ctx *ctx) { compose_ipfix_action(ctx->ofproto, &ctx->xout->odp_actions, &ctx->xin->flow); } /* Fix SAMPLE action according to data collected while composing ODP actions. * We need to fix SAMPLE actions OVS_SAMPLE_ATTR_ACTIONS attribute, i.e. nested * USERSPACE action's user-cookie which is required for sflow. */ static void fix_sflow_action(struct xlate_ctx *ctx) { const struct flow *base = &ctx->base_flow; union user_action_cookie *cookie; if (!ctx->user_cookie_offset) { return; } cookie = ofpbuf_at(&ctx->xout->odp_actions, ctx->user_cookie_offset, sizeof cookie->sflow); ovs_assert(cookie->type == USER_ACTION_COOKIE_SFLOW); compose_sflow_cookie(ctx->ofproto, base->vlan_tci, ctx->sflow_odp_port, ctx->sflow_n_outputs, cookie); } static enum slow_path_reason process_special(struct xlate_ctx *ctx, const struct flow *flow, const struct ofport_dpif *ofport, const struct ofpbuf *packet) { struct ofproto_dpif *ofproto = ctx->ofproto; struct flow_wildcards *wc = &ctx->xout->wc; if (!ofport) { return 0; } else if (ofport->cfm && cfm_should_process_flow(ofport->cfm, flow, wc)) { if (packet) { cfm_process_heartbeat(ofport->cfm, packet); } return SLOW_CFM; } else if (ofport->bfd && bfd_should_process_flow(flow, wc)) { if (packet) { bfd_process_packet(ofport->bfd, flow, packet); } return SLOW_BFD; } else if (ofport->bundle && ofport->bundle->lacp && flow->dl_type == htons(ETH_TYPE_LACP)) { if (packet) { lacp_process_packet(ofport->bundle->lacp, ofport, packet); } return SLOW_LACP; } else if (ofproto->stp && stp_should_process_flow(flow, wc)) { if (packet) { stp_process_packet(ofport, packet); } return SLOW_STP; } else { return 0; } } static void compose_output_action__(struct xlate_ctx *ctx, ofp_port_t ofp_port, bool check_stp) { const struct ofport_dpif *ofport = get_ofp_port(ctx->ofproto, ofp_port); struct flow_wildcards *wc = &ctx->xout->wc; struct flow *flow = &ctx->xin->flow; ovs_be16 flow_vlan_tci; uint32_t flow_skb_mark; uint8_t flow_nw_tos; odp_port_t out_port, odp_port; uint8_t dscp; /* If 'struct flow' gets additional metadata, we'll need to zero it out * before traversing a patch port. */ BUILD_ASSERT_DECL(FLOW_WC_SEQ == 20); if (!ofport) { xlate_report(ctx, "Nonexistent output port"); return; } else if (ofport->up.pp.config & OFPUTIL_PC_NO_FWD) { xlate_report(ctx, "OFPPC_NO_FWD set, skipping output"); return; } else if (check_stp && !stp_forward_in_state(ofport->stp_state)) { xlate_report(ctx, "STP not in forwarding state, skipping output"); return; } if (ofport->peer) { struct ofport_dpif *peer = ofport->peer; struct flow old_flow = ctx->xin->flow; enum slow_path_reason special; ctx->ofproto = ofproto_dpif_cast(peer->up.ofproto); flow->in_port.ofp_port = peer->up.ofp_port; flow->metadata = htonll(0); memset(&flow->tunnel, 0, sizeof flow->tunnel); memset(flow->regs, 0, sizeof flow->regs); special = process_special(ctx, &ctx->xin->flow, peer, ctx->xin->packet); if (special) { ctx->xout->slow = special; } else if (may_receive(peer, ctx)) { if (stp_forward_in_state(peer->stp_state)) { xlate_table_action(ctx, flow->in_port.ofp_port, 0, true); } else { /* Forwarding is disabled by STP. Let OFPP_NORMAL and the * learning action look at the packet, then drop it. */ struct flow old_base_flow = ctx->base_flow; size_t old_size = ctx->xout->odp_actions.size; xlate_table_action(ctx, flow->in_port.ofp_port, 0, true); ctx->base_flow = old_base_flow; ctx->xout->odp_actions.size = old_size; } } ctx->xin->flow = old_flow; ctx->ofproto = ofproto_dpif_cast(ofport->up.ofproto); if (ctx->xin->resubmit_stats) { netdev_vport_inc_tx(ofport->up.netdev, ctx->xin->resubmit_stats); netdev_vport_inc_rx(peer->up.netdev, ctx->xin->resubmit_stats); } return; } flow_vlan_tci = flow->vlan_tci; flow_skb_mark = flow->skb_mark; flow_nw_tos = flow->nw_tos; if (ofproto_dpif_dscp_from_priority(ofport, flow->skb_priority, &dscp)) { wc->masks.nw_tos |= IP_ECN_MASK; flow->nw_tos &= ~IP_DSCP_MASK; flow->nw_tos |= dscp; } if (ofport->tnl_port) { /* Save tunnel metadata so that changes made due to * the Logical (tunnel) Port are not visible for any further * matches, while explicit set actions on tunnel metadata are. */ struct flow_tnl flow_tnl = flow->tunnel; odp_port = tnl_port_send(ofport->tnl_port, flow, &ctx->xout->wc); if (odp_port == ODPP_NONE) { xlate_report(ctx, "Tunneling decided against output"); goto out; /* restore flow_nw_tos */ } if (flow->tunnel.ip_dst == ctx->orig_tunnel_ip_dst) { xlate_report(ctx, "Not tunneling to our own address"); goto out; /* restore flow_nw_tos */ } if (ctx->xin->resubmit_stats) { netdev_vport_inc_tx(ofport->up.netdev, ctx->xin->resubmit_stats); } out_port = odp_port; commit_odp_tunnel_action(flow, &ctx->base_flow, &ctx->xout->odp_actions); flow->tunnel = flow_tnl; /* Restore tunnel metadata */ } else { ofp_port_t vlandev_port; odp_port = ofport->odp_port; if (!hmap_is_empty(&ctx->ofproto->realdev_vid_map)) { wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI); } vlandev_port = vsp_realdev_to_vlandev(ctx->ofproto, ofp_port, flow->vlan_tci); if (vlandev_port == ofp_port) { out_port = odp_port; } else { out_port = ofp_port_to_odp_port(ctx->ofproto, vlandev_port); flow->vlan_tci = htons(0); } flow->skb_mark &= ~IPSEC_MARK; } if (out_port != ODPP_NONE) { commit_odp_actions(flow, &ctx->base_flow, &ctx->xout->odp_actions, &ctx->xout->wc); nl_msg_put_odp_port(&ctx->xout->odp_actions, OVS_ACTION_ATTR_OUTPUT, out_port); ctx->sflow_odp_port = odp_port; ctx->sflow_n_outputs++; ctx->xout->nf_output_iface = ofp_port; } out: /* Restore flow */ flow->vlan_tci = flow_vlan_tci; flow->skb_mark = flow_skb_mark; flow->nw_tos = flow_nw_tos; } static void compose_output_action(struct xlate_ctx *ctx, ofp_port_t ofp_port) { compose_output_action__(ctx, ofp_port, true); } /* Common rule processing in one place to avoid duplicating code. */ static struct rule_dpif * ctx_rule_hooks(struct xlate_ctx *ctx, struct rule_dpif *rule, bool may_packet_in) { if (ctx->xin->resubmit_hook) { ctx->xin->resubmit_hook(ctx->xin, rule, ctx->recurse); } if (rule == NULL && may_packet_in) { /* XXX * check if table configuration flags * OFPTC_TABLE_MISS_CONTROLLER, default. * OFPTC_TABLE_MISS_CONTINUE, * OFPTC_TABLE_MISS_DROP * When OF1.0, OFPTC_TABLE_MISS_CONTINUE is used. What to do? */ rule = rule_dpif_miss_rule(ctx->ofproto, &ctx->xin->flow); } if (rule && ctx->xin->resubmit_stats) { rule_credit_stats(rule, ctx->xin->resubmit_stats); } return rule; } static void xlate_table_action(struct xlate_ctx *ctx, ofp_port_t in_port, uint8_t table_id, bool may_packet_in) { if (ctx->recurse < MAX_RESUBMIT_RECURSION) { struct rule_dpif *rule; ofp_port_t old_in_port = ctx->xin->flow.in_port.ofp_port; uint8_t old_table_id = ctx->table_id; ctx->table_id = table_id; /* Look up a flow with 'in_port' as the input port. */ ctx->xin->flow.in_port.ofp_port = in_port; rule = rule_dpif_lookup_in_table(ctx->ofproto, &ctx->xin->flow, &ctx->xout->wc, table_id); ctx->xout->tags |= calculate_flow_tag(ctx->ofproto, &ctx->xin->flow, ctx->table_id, rule); /* Restore the original input port. Otherwise OFPP_NORMAL and * OFPP_IN_PORT will have surprising behavior. */ ctx->xin->flow.in_port.ofp_port = old_in_port; rule = ctx_rule_hooks(ctx, rule, may_packet_in); if (rule) { struct rule_dpif *old_rule = ctx->rule; ctx->recurse++; ctx->rule = rule; do_xlate_actions(rule->up.ofpacts, rule->up.ofpacts_len, ctx); ctx->rule = old_rule; ctx->recurse--; } ctx->table_id = old_table_id; } else { static struct vlog_rate_limit recurse_rl = VLOG_RATE_LIMIT_INIT(1, 1); VLOG_ERR_RL(&recurse_rl, "resubmit actions recursed over %d times", MAX_RESUBMIT_RECURSION); ctx->max_resubmit_trigger = true; } } static void xlate_ofpact_resubmit(struct xlate_ctx *ctx, const struct ofpact_resubmit *resubmit) { ofp_port_t in_port; uint8_t table_id; in_port = resubmit->in_port; if (in_port == OFPP_IN_PORT) { in_port = ctx->xin->flow.in_port.ofp_port; } table_id = resubmit->table_id; if (table_id == 255) { table_id = ctx->table_id; } xlate_table_action(ctx, in_port, table_id, false); } static void flood_packets(struct xlate_ctx *ctx, bool all) { struct ofport_dpif *ofport; HMAP_FOR_EACH (ofport, up.hmap_node, &ctx->ofproto->up.ports) { ofp_port_t ofp_port = ofport->up.ofp_port; if (ofp_port == ctx->xin->flow.in_port.ofp_port) { continue; } if (all) { compose_output_action__(ctx, ofp_port, false); } else if (!(ofport->up.pp.config & OFPUTIL_PC_NO_FLOOD)) { compose_output_action(ctx, ofp_port); } } ctx->xout->nf_output_iface = NF_OUT_FLOOD; } static void execute_controller_action(struct xlate_ctx *ctx, int len, enum ofp_packet_in_reason reason, uint16_t controller_id) { struct ofputil_packet_in pin; struct ofpbuf *packet; struct flow key; ovs_assert(!ctx->xout->slow || ctx->xout->slow == SLOW_CONTROLLER); ctx->xout->slow = SLOW_CONTROLLER; if (!ctx->xin->packet) { return; } packet = ofpbuf_clone(ctx->xin->packet); key.skb_priority = 0; key.skb_mark = 0; memset(&key.tunnel, 0, sizeof key.tunnel); commit_odp_actions(&ctx->xin->flow, &ctx->base_flow, &ctx->xout->odp_actions, &ctx->xout->wc); odp_execute_actions(NULL, packet, &key, ctx->xout->odp_actions.data, ctx->xout->odp_actions.size, NULL, NULL); pin.packet = packet->data; pin.packet_len = packet->size; pin.reason = reason; pin.controller_id = controller_id; pin.table_id = ctx->table_id; pin.cookie = ctx->rule ? ctx->rule->up.flow_cookie : 0; pin.send_len = len; flow_get_metadata(&ctx->xin->flow, &pin.fmd); connmgr_send_packet_in(ctx->ofproto->up.connmgr, &pin); ofpbuf_delete(packet); } static void compose_mpls_push_action(struct xlate_ctx *ctx, ovs_be16 eth_type) { struct flow_wildcards *wc = &ctx->xout->wc; struct flow *flow = &ctx->xin->flow; ovs_assert(eth_type_mpls(eth_type)); memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse); memset(&wc->masks.mpls_depth, 0xff, sizeof wc->masks.mpls_depth); if (flow->mpls_depth) { flow->mpls_lse &= ~htonl(MPLS_BOS_MASK); flow->mpls_depth++; } else { ovs_be32 label; uint8_t tc, ttl; if (flow->dl_type == htons(ETH_TYPE_IPV6)) { label = htonl(0x2); /* IPV6 Explicit Null. */ } else { label = htonl(0x0); /* IPV4 Explicit Null. */ } wc->masks.nw_tos |= IP_DSCP_MASK; wc->masks.nw_ttl = 0xff; tc = (flow->nw_tos & IP_DSCP_MASK) >> 2; ttl = flow->nw_ttl ? flow->nw_ttl : 0x40; flow->mpls_lse = set_mpls_lse_values(ttl, tc, 1, label); flow->mpls_depth = 1; } flow->dl_type = eth_type; } static void compose_mpls_pop_action(struct xlate_ctx *ctx, ovs_be16 eth_type) { struct flow_wildcards *wc = &ctx->xout->wc; struct flow *flow = &ctx->xin->flow; ovs_assert(eth_type_mpls(ctx->xin->flow.dl_type)); ovs_assert(!eth_type_mpls(eth_type)); memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse); memset(&wc->masks.mpls_depth, 0xff, sizeof wc->masks.mpls_depth); if (flow->mpls_depth) { flow->mpls_depth--; flow->mpls_lse = htonl(0); if (!flow->mpls_depth) { flow->dl_type = eth_type; } } } static bool compose_dec_ttl(struct xlate_ctx *ctx, struct ofpact_cnt_ids *ids) { struct flow *flow = &ctx->xin->flow; if (!is_ip_any(flow)) { return false; } ctx->xout->wc.masks.nw_ttl = 0xff; if (flow->nw_ttl > 1) { flow->nw_ttl--; return false; } else { size_t i; for (i = 0; i < ids->n_controllers; i++) { execute_controller_action(ctx, UINT16_MAX, OFPR_INVALID_TTL, ids->cnt_ids[i]); } /* Stop processing for current table. */ return true; } } static bool compose_set_mpls_ttl_action(struct xlate_ctx *ctx, uint8_t ttl) { if (!eth_type_mpls(ctx->xin->flow.dl_type)) { return true; } set_mpls_lse_ttl(&ctx->xin->flow.mpls_lse, ttl); return false; } static bool compose_dec_mpls_ttl_action(struct xlate_ctx *ctx) { struct flow *flow = &ctx->xin->flow; uint8_t ttl = mpls_lse_to_ttl(flow->mpls_lse); struct flow_wildcards *wc = &ctx->xout->wc; memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse); if (!eth_type_mpls(flow->dl_type)) { return false; } if (ttl > 1) { ttl--; set_mpls_lse_ttl(&flow->mpls_lse, ttl); return false; } else { execute_controller_action(ctx, UINT16_MAX, OFPR_INVALID_TTL, 0); /* Stop processing for current table. */ return true; } } static void xlate_output_action(struct xlate_ctx *ctx, ofp_port_t port, uint16_t max_len, bool may_packet_in) { ofp_port_t prev_nf_output_iface = ctx->xout->nf_output_iface; ctx->xout->nf_output_iface = NF_OUT_DROP; switch (port) { case OFPP_IN_PORT: compose_output_action(ctx, ctx->xin->flow.in_port.ofp_port); break; case OFPP_TABLE: xlate_table_action(ctx, ctx->xin->flow.in_port.ofp_port, 0, may_packet_in); break; case OFPP_NORMAL: xlate_normal(ctx); break; case OFPP_FLOOD: flood_packets(ctx, false); break; case OFPP_ALL: flood_packets(ctx, true); break; case OFPP_CONTROLLER: execute_controller_action(ctx, max_len, OFPR_ACTION, 0); break; case OFPP_NONE: break; case OFPP_LOCAL: default: if (port != ctx->xin->flow.in_port.ofp_port) { compose_output_action(ctx, port); } else { xlate_report(ctx, "skipping output to input port"); } break; } if (prev_nf_output_iface == NF_OUT_FLOOD) { ctx->xout->nf_output_iface = NF_OUT_FLOOD; } else if (ctx->xout->nf_output_iface == NF_OUT_DROP) { ctx->xout->nf_output_iface = prev_nf_output_iface; } else if (prev_nf_output_iface != NF_OUT_DROP && ctx->xout->nf_output_iface != NF_OUT_FLOOD) { ctx->xout->nf_output_iface = NF_OUT_MULTI; } } static void xlate_output_reg_action(struct xlate_ctx *ctx, const struct ofpact_output_reg *or) { uint64_t port = mf_get_subfield(&or->src, &ctx->xin->flow); if (port <= UINT16_MAX) { union mf_subvalue value; memset(&value, 0xff, sizeof value); mf_write_subfield_flow(&or->src, &value, &ctx->xout->wc.masks); xlate_output_action(ctx, u16_to_ofp(port), or->max_len, false); } } static void xlate_enqueue_action(struct xlate_ctx *ctx, const struct ofpact_enqueue *enqueue) { ofp_port_t ofp_port = enqueue->port; uint32_t queue_id = enqueue->queue; uint32_t flow_priority, priority; int error; /* Translate queue to priority. */ error = ofproto_dpif_queue_to_priority(ctx->ofproto, queue_id, &priority); if (error) { /* Fall back to ordinary output action. */ xlate_output_action(ctx, enqueue->port, 0, false); return; } /* Check output port. */ if (ofp_port == OFPP_IN_PORT) { ofp_port = ctx->xin->flow.in_port.ofp_port; } else if (ofp_port == ctx->xin->flow.in_port.ofp_port) { return; } /* Add datapath actions. */ flow_priority = ctx->xin->flow.skb_priority; ctx->xin->flow.skb_priority = priority; compose_output_action(ctx, ofp_port); ctx->xin->flow.skb_priority = flow_priority; /* Update NetFlow output port. */ if (ctx->xout->nf_output_iface == NF_OUT_DROP) { ctx->xout->nf_output_iface = ofp_port; } else if (ctx->xout->nf_output_iface != NF_OUT_FLOOD) { ctx->xout->nf_output_iface = NF_OUT_MULTI; } } static void xlate_set_queue_action(struct xlate_ctx *ctx, uint32_t queue_id) { uint32_t skb_priority; if (!ofproto_dpif_queue_to_priority(ctx->ofproto, queue_id, &skb_priority)) { ctx->xin->flow.skb_priority = skb_priority; } else { /* Couldn't translate queue to a priority. Nothing to do. A warning * has already been logged. */ } } static bool slave_enabled_cb(ofp_port_t ofp_port, void *ofproto_) { struct ofproto_dpif *ofproto = ofproto_; struct ofport_dpif *port; switch (ofp_port) { case OFPP_IN_PORT: case OFPP_TABLE: case OFPP_NORMAL: case OFPP_FLOOD: case OFPP_ALL: case OFPP_NONE: return true; case OFPP_CONTROLLER: /* Not supported by the bundle action. */ return false; default: port = get_ofp_port(ofproto, ofp_port); return port ? port->may_enable : false; } } static void xlate_bundle_action(struct xlate_ctx *ctx, const struct ofpact_bundle *bundle) { ofp_port_t port; port = bundle_execute(bundle, &ctx->xin->flow, &ctx->xout->wc, slave_enabled_cb, ctx->ofproto); if (bundle->dst.field) { nxm_reg_load(&bundle->dst, ofp_to_u16(port), &ctx->xin->flow); } else { xlate_output_action(ctx, port, 0, false); } } static void xlate_learn_action(struct xlate_ctx *ctx, const struct ofpact_learn *learn) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 1); struct ofputil_flow_mod fm; uint64_t ofpacts_stub[1024 / 8]; struct ofpbuf ofpacts; int error; ctx->xout->has_learn = true; learn_mask(learn, &ctx->xout->wc); if (!ctx->xin->may_learn) { return; } ofpbuf_use_stack(&ofpacts, ofpacts_stub, sizeof ofpacts_stub); learn_execute(learn, &ctx->xin->flow, &fm, &ofpacts); error = ofproto_flow_mod(&ctx->ofproto->up, &fm); if (error && !VLOG_DROP_WARN(&rl)) { VLOG_WARN("learning action failed to modify flow table (%s)", ofperr_get_name(error)); } ofpbuf_uninit(&ofpacts); } /* Reduces '*timeout' to no more than 'max'. A value of zero in either case * means "infinite". */ static void reduce_timeout(uint16_t max, uint16_t *timeout) { if (max && (!*timeout || *timeout > max)) { *timeout = max; } } static void xlate_fin_timeout(struct xlate_ctx *ctx, const struct ofpact_fin_timeout *oft) { if (ctx->xin->tcp_flags & (TCP_FIN | TCP_RST) && ctx->rule) { struct rule_dpif *rule = ctx->rule; reduce_timeout(oft->fin_idle_timeout, &rule->up.idle_timeout); reduce_timeout(oft->fin_hard_timeout, &rule->up.hard_timeout); } } static void xlate_sample_action(struct xlate_ctx *ctx, const struct ofpact_sample *os) { union user_action_cookie cookie; /* Scale the probability from 16-bit to 32-bit while representing * the same percentage. */ uint32_t probability = (os->probability << 16) | os->probability; commit_odp_actions(&ctx->xin->flow, &ctx->base_flow, &ctx->xout->odp_actions, &ctx->xout->wc); compose_flow_sample_cookie(os->probability, os->collector_set_id, os->obs_domain_id, os->obs_point_id, &cookie); compose_sample_action(ctx->ofproto, &ctx->xout->odp_actions, &ctx->xin->flow, probability, &cookie, sizeof cookie.flow_sample); } static bool may_receive(const struct ofport_dpif *port, struct xlate_ctx *ctx) { if (port->up.pp.config & (eth_addr_equals(ctx->xin->flow.dl_dst, eth_addr_stp) ? OFPUTIL_PC_NO_RECV_STP : OFPUTIL_PC_NO_RECV)) { return false; } /* Only drop packets here if both forwarding and learning are * disabled. If just learning is enabled, we need to have * OFPP_NORMAL and the learning action have a look at the packet * before we can drop it. */ if (!stp_forward_in_state(port->stp_state) && !stp_learn_in_state(port->stp_state)) { return false; } return true; } static bool tunnel_ecn_ok(struct xlate_ctx *ctx) { if (is_ip_any(&ctx->base_flow) && (ctx->xin->flow.tunnel.ip_tos & IP_ECN_MASK) == IP_ECN_CE) { if ((ctx->base_flow.nw_tos & IP_ECN_MASK) == IP_ECN_NOT_ECT) { VLOG_WARN_RL(&rl, "dropping tunnel packet marked ECN CE" " but is not ECN capable"); return false; } else { /* Set the ECN CE value in the tunneled packet. */ ctx->xin->flow.nw_tos |= IP_ECN_CE; } } return true; } static void do_xlate_actions(const struct ofpact *ofpacts, size_t ofpacts_len, struct xlate_ctx *ctx) { struct flow_wildcards *wc = &ctx->xout->wc; struct flow *flow = &ctx->xin->flow; bool was_evictable = true; const struct ofpact *a; if (ctx->rule) { /* Don't let the rule we're working on get evicted underneath us. */ was_evictable = ctx->rule->up.evictable; ctx->rule->up.evictable = false; } do_xlate_actions_again: OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) { struct ofpact_controller *controller; const struct ofpact_metadata *metadata; if (ctx->exit) { break; } switch (a->type) { case OFPACT_OUTPUT: xlate_output_action(ctx, ofpact_get_OUTPUT(a)->port, ofpact_get_OUTPUT(a)->max_len, true); break; case OFPACT_CONTROLLER: controller = ofpact_get_CONTROLLER(a); execute_controller_action(ctx, controller->max_len, controller->reason, controller->controller_id); break; case OFPACT_ENQUEUE: xlate_enqueue_action(ctx, ofpact_get_ENQUEUE(a)); break; case OFPACT_SET_VLAN_VID: flow->vlan_tci &= ~htons(VLAN_VID_MASK); flow->vlan_tci |= (htons(ofpact_get_SET_VLAN_VID(a)->vlan_vid) | htons(VLAN_CFI)); break; case OFPACT_SET_VLAN_PCP: flow->vlan_tci &= ~htons(VLAN_PCP_MASK); flow->vlan_tci |= htons((ofpact_get_SET_VLAN_PCP(a)->vlan_pcp << VLAN_PCP_SHIFT) | VLAN_CFI); break; case OFPACT_STRIP_VLAN: flow->vlan_tci = htons(0); break; case OFPACT_PUSH_VLAN: /* XXX 802.1AD(QinQ) */ flow->vlan_tci = htons(VLAN_CFI); break; case OFPACT_SET_ETH_SRC: memcpy(flow->dl_src, ofpact_get_SET_ETH_SRC(a)->mac, ETH_ADDR_LEN); break; case OFPACT_SET_ETH_DST: memcpy(flow->dl_dst, ofpact_get_SET_ETH_DST(a)->mac, ETH_ADDR_LEN); break; case OFPACT_SET_IPV4_SRC: if (flow->dl_type == htons(ETH_TYPE_IP)) { flow->nw_src = ofpact_get_SET_IPV4_SRC(a)->ipv4; } break; case OFPACT_SET_IPV4_DST: if (flow->dl_type == htons(ETH_TYPE_IP)) { flow->nw_dst = ofpact_get_SET_IPV4_DST(a)->ipv4; } break; case OFPACT_SET_IPV4_DSCP: /* OpenFlow 1.0 only supports IPv4. */ if (flow->dl_type == htons(ETH_TYPE_IP)) { flow->nw_tos &= ~IP_DSCP_MASK; flow->nw_tos |= ofpact_get_SET_IPV4_DSCP(a)->dscp; } break; case OFPACT_SET_L4_SRC_PORT: memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto); if (is_ip_any(flow)) { flow->tp_src = htons(ofpact_get_SET_L4_SRC_PORT(a)->port); } break; case OFPACT_SET_L4_DST_PORT: memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto); if (is_ip_any(flow)) { flow->tp_dst = htons(ofpact_get_SET_L4_DST_PORT(a)->port); } break; case OFPACT_RESUBMIT: xlate_ofpact_resubmit(ctx, ofpact_get_RESUBMIT(a)); break; case OFPACT_SET_TUNNEL: flow->tunnel.tun_id = htonll(ofpact_get_SET_TUNNEL(a)->tun_id); break; case OFPACT_SET_QUEUE: xlate_set_queue_action(ctx, ofpact_get_SET_QUEUE(a)->queue_id); break; case OFPACT_POP_QUEUE: flow->skb_priority = ctx->orig_skb_priority; break; case OFPACT_REG_MOVE: nxm_execute_reg_move(ofpact_get_REG_MOVE(a), flow, wc); break; case OFPACT_REG_LOAD: nxm_execute_reg_load(ofpact_get_REG_LOAD(a), flow); break; case OFPACT_STACK_PUSH: nxm_execute_stack_push(ofpact_get_STACK_PUSH(a), flow, wc, &ctx->stack); break; case OFPACT_STACK_POP: nxm_execute_stack_pop(ofpact_get_STACK_POP(a), flow, &ctx->stack); break; case OFPACT_PUSH_MPLS: compose_mpls_push_action(ctx, ofpact_get_PUSH_MPLS(a)->ethertype); break; case OFPACT_POP_MPLS: compose_mpls_pop_action(ctx, ofpact_get_POP_MPLS(a)->ethertype); break; case OFPACT_SET_MPLS_TTL: if (compose_set_mpls_ttl_action(ctx, ofpact_get_SET_MPLS_TTL(a)->ttl)) { goto out; } break; case OFPACT_DEC_MPLS_TTL: if (compose_dec_mpls_ttl_action(ctx)) { goto out; } break; case OFPACT_DEC_TTL: if (compose_dec_ttl(ctx, ofpact_get_DEC_TTL(a))) { goto out; } break; case OFPACT_NOTE: /* Nothing to do. */ break; case OFPACT_MULTIPATH: multipath_execute(ofpact_get_MULTIPATH(a), flow, wc); break; case OFPACT_BUNDLE: xlate_bundle_action(ctx, ofpact_get_BUNDLE(a)); break; case OFPACT_OUTPUT_REG: xlate_output_reg_action(ctx, ofpact_get_OUTPUT_REG(a)); break; case OFPACT_LEARN: xlate_learn_action(ctx, ofpact_get_LEARN(a)); break; case OFPACT_EXIT: ctx->exit = true; break; case OFPACT_FIN_TIMEOUT: memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto); ctx->xout->has_fin_timeout = true; xlate_fin_timeout(ctx, ofpact_get_FIN_TIMEOUT(a)); break; case OFPACT_CLEAR_ACTIONS: /* XXX * Nothing to do because writa-actions is not supported for now. * When writa-actions is supported, clear-actions also must * be supported at the same time. */ break; case OFPACT_WRITE_METADATA: metadata = ofpact_get_WRITE_METADATA(a); flow->metadata &= ~metadata->mask; flow->metadata |= metadata->metadata & metadata->mask; break; case OFPACT_METER: /* Not implemented yet. */ break; case OFPACT_GOTO_TABLE: { /* It is assumed that goto-table is the last action. */ struct ofpact_goto_table *ogt = ofpact_get_GOTO_TABLE(a); struct rule_dpif *rule; ovs_assert(ctx->table_id < ogt->table_id); ctx->table_id = ogt->table_id; /* Look up a flow from the new table. */ rule = rule_dpif_lookup_in_table(ctx->ofproto, flow, wc, ctx->table_id); ctx->xout->tags = calculate_flow_tag(ctx->ofproto, &ctx->xin->flow, ctx->table_id, rule); rule = ctx_rule_hooks(ctx, rule, true); if (rule) { if (ctx->rule) { ctx->rule->up.evictable = was_evictable; } ctx->rule = rule; was_evictable = rule->up.evictable; rule->up.evictable = false; /* Tail recursion removal. */ ofpacts = rule->up.ofpacts; ofpacts_len = rule->up.ofpacts_len; goto do_xlate_actions_again; } break; } case OFPACT_SAMPLE: xlate_sample_action(ctx, ofpact_get_SAMPLE(a)); break; } } out: if (ctx->rule) { ctx->rule->up.evictable = was_evictable; } } void xlate_in_init(struct xlate_in *xin, struct ofproto_dpif *ofproto, const struct flow *flow, struct rule_dpif *rule, uint8_t tcp_flags, const struct ofpbuf *packet) { xin->ofproto = ofproto; xin->flow = *flow; xin->packet = packet; xin->may_learn = packet != NULL; xin->rule = rule; xin->ofpacts = NULL; xin->ofpacts_len = 0; xin->tcp_flags = tcp_flags; xin->resubmit_hook = NULL; xin->report_hook = NULL; xin->resubmit_stats = NULL; } void xlate_out_uninit(struct xlate_out *xout) { if (xout) { ofpbuf_uninit(&xout->odp_actions); } } /* Translates the 'ofpacts_len' bytes of "struct ofpact"s starting at 'ofpacts' * into datapath actions, using 'ctx', and discards the datapath actions. */ void xlate_actions_for_side_effects(struct xlate_in *xin) { struct xlate_out xout; xlate_actions(xin, &xout); xlate_out_uninit(&xout); } static void xlate_report(struct xlate_ctx *ctx, const char *s) { if (ctx->xin->report_hook) { ctx->xin->report_hook(ctx->xin, s, ctx->recurse); } } void xlate_out_copy(struct xlate_out *dst, const struct xlate_out *src) { dst->wc = src->wc; dst->tags = src->tags; dst->slow = src->slow; dst->has_learn = src->has_learn; dst->has_normal = src->has_normal; dst->has_fin_timeout = src->has_fin_timeout; dst->nf_output_iface = src->nf_output_iface; dst->mirrors = src->mirrors; ofpbuf_use_stub(&dst->odp_actions, dst->odp_actions_stub, sizeof dst->odp_actions_stub); ofpbuf_put(&dst->odp_actions, src->odp_actions.data, src->odp_actions.size); } static bool actions_output_to_local_port(const struct xlate_ctx *ctx) { odp_port_t local_odp_port = ofp_port_to_odp_port(ctx->ofproto, OFPP_LOCAL); const struct nlattr *a; unsigned int left; NL_ATTR_FOR_EACH_UNSAFE (a, left, ctx->xout->odp_actions.data, ctx->xout->odp_actions.size) { if (nl_attr_type(a) == OVS_ACTION_ATTR_OUTPUT && nl_attr_get_odp_port(a) == local_odp_port) { return true; } } return false; } /* Translates the 'ofpacts_len' bytes of "struct ofpacts" starting at 'ofpacts' * into datapath actions in 'odp_actions', using 'ctx'. */ void xlate_actions(struct xlate_in *xin, struct xlate_out *xout) { /* Normally false. Set to true if we ever hit MAX_RESUBMIT_RECURSION, so * that in the future we always keep a copy of the original flow for * tracing purposes. */ static bool hit_resubmit_limit; struct flow_wildcards *wc = &xout->wc; struct flow *flow = &xin->flow; enum slow_path_reason special; const struct ofpact *ofpacts; struct ofport_dpif *in_port; struct flow orig_flow; struct xlate_ctx ctx; size_t ofpacts_len; COVERAGE_INC(ofproto_dpif_xlate); /* Flow initialization rules: * - 'base_flow' must match the kernel's view of the packet at the * time that action processing starts. 'flow' represents any * transformations we wish to make through actions. * - By default 'base_flow' and 'flow' are the same since the input * packet matches the output before any actions are applied. * - When using VLAN splinters, 'base_flow''s VLAN is set to the value * of the received packet as seen by the kernel. If we later output * to another device without any modifications this will cause us to * insert a new tag since the original one was stripped off by the * VLAN device. * - Tunnel metadata as received is retained in 'flow'. This allows * tunnel metadata matching also in later tables. * Since a kernel action for setting the tunnel metadata will only be * generated with actual tunnel output, changing the tunnel metadata * values in 'flow' (such as tun_id) will only have effect with a later * tunnel output action. * - Tunnel 'base_flow' is completely cleared since that is what the * kernel does. If we wish to maintain the original values an action * needs to be generated. */ ctx.xin = xin; ctx.xout = xout; ctx.ofproto = xin->ofproto; ctx.rule = xin->rule; ctx.base_flow = *flow; memset(&ctx.base_flow.tunnel, 0, sizeof ctx.base_flow.tunnel); ctx.orig_tunnel_ip_dst = flow->tunnel.ip_dst; flow_wildcards_init_catchall(wc); memset(&wc->masks.in_port, 0xff, sizeof wc->masks.in_port); memset(&wc->masks.skb_priority, 0xff, sizeof wc->masks.skb_priority); memset(&wc->masks.dl_type, 0xff, sizeof wc->masks.dl_type); wc->masks.nw_frag |= FLOW_NW_FRAG_MASK; if (tnl_port_should_receive(&ctx.xin->flow)) { memset(&wc->masks.tunnel, 0xff, sizeof wc->masks.tunnel); } if (xin->ofproto->netflow) { netflow_mask_wc(wc); } ctx.xout->tags = 0; ctx.xout->slow = 0; ctx.xout->has_learn = false; ctx.xout->has_normal = false; ctx.xout->has_fin_timeout = false; ctx.xout->nf_output_iface = NF_OUT_DROP; ctx.xout->mirrors = 0; ofpbuf_use_stub(&ctx.xout->odp_actions, ctx.xout->odp_actions_stub, sizeof ctx.xout->odp_actions_stub); ofpbuf_reserve(&ctx.xout->odp_actions, NL_A_U32_SIZE); ctx.recurse = 0; ctx.max_resubmit_trigger = false; ctx.orig_skb_priority = flow->skb_priority; ctx.table_id = 0; ctx.exit = false; if (xin->ofpacts) { ofpacts = xin->ofpacts; ofpacts_len = xin->ofpacts_len; } else if (xin->rule) { ofpacts = xin->rule->up.ofpacts; ofpacts_len = xin->rule->up.ofpacts_len; } else { NOT_REACHED(); } ofpbuf_use_stub(&ctx.stack, ctx.init_stack, sizeof ctx.init_stack); if (ctx.ofproto->has_mirrors || hit_resubmit_limit) { /* Do this conditionally because the copy is expensive enough that it * shows up in profiles. */ orig_flow = *flow; } if (flow->nw_frag & FLOW_NW_FRAG_ANY) { switch (ctx.ofproto->up.frag_handling) { case OFPC_FRAG_NORMAL: /* We must pretend that transport ports are unavailable. */ flow->tp_src = ctx.base_flow.tp_src = htons(0); flow->tp_dst = ctx.base_flow.tp_dst = htons(0); break; case OFPC_FRAG_DROP: return; case OFPC_FRAG_REASM: NOT_REACHED(); case OFPC_FRAG_NX_MATCH: /* Nothing to do. */ break; case OFPC_INVALID_TTL_TO_CONTROLLER: NOT_REACHED(); } } in_port = get_ofp_port(ctx.ofproto, flow->in_port.ofp_port); special = process_special(&ctx, flow, in_port, ctx.xin->packet); if (special) { ctx.xout->slow = special; } else { static struct vlog_rate_limit trace_rl = VLOG_RATE_LIMIT_INIT(1, 1); size_t sample_actions_len; if (flow->in_port.ofp_port != vsp_realdev_to_vlandev(ctx.ofproto, flow->in_port.ofp_port, flow->vlan_tci)) { ctx.base_flow.vlan_tci = 0; } add_sflow_action(&ctx); add_ipfix_action(&ctx); sample_actions_len = ctx.xout->odp_actions.size; if (tunnel_ecn_ok(&ctx) && (!in_port || may_receive(in_port, &ctx))) { do_xlate_actions(ofpacts, ofpacts_len, &ctx); /* We've let OFPP_NORMAL and the learning action look at the * packet, so drop it now if forwarding is disabled. */ if (in_port && !stp_forward_in_state(in_port->stp_state)) { ctx.xout->odp_actions.size = sample_actions_len; } } if (ctx.max_resubmit_trigger && !ctx.xin->resubmit_hook) { if (!hit_resubmit_limit) { /* We didn't record the original flow. Make sure we do from * now on. */ hit_resubmit_limit = true; } else if (!VLOG_DROP_ERR(&trace_rl)) { struct ds ds = DS_EMPTY_INITIALIZER; ofproto_trace(ctx.ofproto, &orig_flow, ctx.xin->packet, &ds); VLOG_ERR("Trace triggered by excessive resubmit " "recursion:\n%s", ds_cstr(&ds)); ds_destroy(&ds); } } if (connmgr_has_in_band(ctx.ofproto->up.connmgr) && in_band_must_output_to_local_port(flow) && !actions_output_to_local_port(&ctx)) { compose_output_action(&ctx, OFPP_LOCAL); } if (ctx.ofproto->has_mirrors) { add_mirror_actions(&ctx, &orig_flow); } fix_sflow_action(&ctx); } ofpbuf_uninit(&ctx.stack); /* Clear the metadata and register wildcard masks, because we won't * use non-header fields as part of the cache. */ memset(&wc->masks.metadata, 0, sizeof wc->masks.metadata); memset(&wc->masks.regs, 0, sizeof wc->masks.regs); }