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pkt_flow_info.cc
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pkt_flow_info.cc
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/*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include "base/os.h"
#include <arpa/inet.h>
#include <netinet/in.h>
#include "route/route.h"
#include "cmn/agent_cmn.h"
#include "init/agent_param.h"
#include "oper/interface_common.h"
#include "oper/nexthop.h"
#include "oper/route_common.h"
#include "oper/path_preference.h"
#include "oper/vrf.h"
#include "oper/sg.h"
#include "oper/global_vrouter.h"
#include "oper/operdb_init.h"
#include "oper/tunnel_nh.h"
#include "filter/packet_header.h"
#include "filter/acl.h"
#include "pkt/proto.h"
#include "pkt/proto_handler.h"
#include "pkt/pkt_handler.h"
#include "pkt/flow_table.h"
#include "pkt/flow_proto.h"
#include "pkt/pkt_sandesh_flow.h"
#include "pkt/agent_stats.h"
#include <vrouter/ksync/flowtable_ksync.h>
#include <vrouter/ksync/ksync_init.h>
#include <vrouter/flow_stats/flow_stats_collector.h>
static void LogError(const PktInfo *pkt, const char *str) {
if (pkt->family == Address::INET) {
FLOW_TRACE(DetailErr, pkt->agent_hdr.cmd_param, pkt->agent_hdr.ifindex,
pkt->agent_hdr.vrf, pkt->ip_saddr.to_v4().to_ulong(),
pkt->ip_daddr.to_v4().to_ulong(), str, pkt->l3_forwarding);
} else if (pkt->family == Address::INET6) {
// TODO : IPv6
FLOW_TRACE(DetailErr, pkt->agent_hdr.cmd_param, pkt->agent_hdr.ifindex,
pkt->agent_hdr.vrf, -1, -1, str, pkt->l3_forwarding);
} else {
assert(0);
}
}
// VRF changed for the packet. Treat it as Layer3 packet from now.
// Note:
// Features like service chain are supported only for Layer3. Bridge
// entries are not leaked into the new VRF and any bridge entry lookup
// into new VRF will also Fail. So, even VRouter will treat packets
// as L3 after VRF transaltion.
void PktFlowInfo::ChangeVrf(const PktInfo *pkt, PktControlInfo *info,
const VrfEntry *vrf) {
l3_flow = true;
pkt->l3_forwarding = true;
}
void PktFlowInfo::UpdateRoute(const AgentRoute **rt, const VrfEntry *vrf,
const IpAddress &ip, const MacAddress &mac,
FlowRouteRefMap &ref_map) {
if (*rt != NULL && (*rt)->GetTableType() != Agent::BRIDGE)
ref_map[(*rt)->vrf_id()] = RouteToPrefixLen(*rt);
if (l3_flow) {
*rt = flow_table->GetUcRoute(vrf, ip);
} else {
*rt = flow_table->GetL2Route(vrf, mac);
}
if (*rt == NULL)
ref_map[vrf->vrf_id()] = 0;
}
uint8_t PktFlowInfo::RouteToPrefixLen(const AgentRoute *route) {
if (route == NULL) {
return 0;
}
const InetUnicastRouteEntry *inet_rt =
dynamic_cast<const InetUnicastRouteEntry *>(route);
if (inet_rt != NULL) {
return inet_rt->plen();
}
const BridgeRouteEntry *l2_rt =
dynamic_cast<const BridgeRouteEntry *>(route);
if (l2_rt) {
return l2_rt->mac().bit_len();
}
assert(0);
return -1;
}
// Traffic from IPFabric to VM is treated as EGRESS
// Any other traffic is INGRESS
bool PktFlowInfo::ComputeDirection(const Interface *intf) {
bool ret = true;
if (intf->type() == Interface::PHYSICAL) {
ret = false;
}
return ret;
}
// Get VRF corresponding to a NH
static uint32_t NhToVrf(const NextHop *nh) {
const VrfEntry *vrf = NULL;
switch (nh->GetType()) {
case NextHop::COMPOSITE: {
vrf = (static_cast<const CompositeNH *>(nh))->vrf();
break;
}
case NextHop::NextHop::INTERFACE: {
const Interface *intf =
(static_cast<const InterfaceNH *>(nh))->GetInterface();
if (intf)
vrf = intf->vrf();
break;
}
default:
break;
}
if (vrf == NULL)
return VrfEntry::kInvalidIndex;
if (!vrf->IsActive())
return VrfEntry::kInvalidIndex;
return vrf->vrf_id();
}
static const NextHop* GetPolicyEnabledNH(const NextHop *nh) {
if (nh->PolicyEnabled()) {
return nh;
}
DBEntryBase::KeyPtr key = nh->GetDBRequestKey();
NextHopKey *nh_key = static_cast<NextHopKey *>(key.get());
nh_key->SetPolicy(true);
return static_cast<const NextHop *>(
Agent::GetInstance()->nexthop_table()->FindActiveEntry(key.get()));
}
static const NextHop* GetPolicyDisabledNH(const NextHop *nh) {
if (nh->PolicyEnabled() == false) {
return nh;
}
DBEntryBase::KeyPtr key = nh->GetDBRequestKey();
NextHopKey *nh_key = static_cast<NextHopKey *>(key.get());
nh_key->SetPolicy(false);
return static_cast<const NextHop *>(
Agent::GetInstance()->nexthop_table()->FindActiveEntry(key.get()));
}
static bool IsVgwOrVmInterface(const Interface *intf) {
if (intf->type() == Interface::VM_INTERFACE)
return true;
if (intf->type() == Interface::INET) {
const InetInterface *inet = static_cast<const InetInterface *>(intf);
if (inet->sub_type() == InetInterface::SIMPLE_GATEWAY)
return true;
}
return false;
}
// Get interface from a NH. Also, decode ECMP information from NH
// Responsible to set following fields,
// out->nh_ : outgoing Nexthop Index. Will also be used to set reverse flow-key
// out->vrf_ : VRF to be used after flow processing. Value set here can
// potentially get overridden later
// TODO: Revisit the use of vrf_, dest_vrf and nat_vrf
// force_vmport means, we want destination to be VM_INTERFACE only
// This is to avoid routing across fabric interface itself
static bool NhDecode(const NextHop *nh, const PktInfo *pkt, PktFlowInfo *info,
PktControlInfo *in, PktControlInfo *out,
bool force_vmport) {
bool ret = true;
if (!nh->IsActive())
return false;
// If its composite NH, find interface information from the component NH
const CompositeNH *comp_nh = NULL;
// Out NH points to Composite. We only expect ECMP Composite-NH
// Find the out_component_nh_idx
if (nh->GetType() == NextHop::COMPOSITE) {
// We dont expect L2 multicast packets. Return failure to drop packet
if (pkt->l3_forwarding == false)
return false;
comp_nh = static_cast<const CompositeNH *>(nh);
if (comp_nh->composite_nh_type() == Composite::ECMP ||
comp_nh->composite_nh_type() == Composite::LOCAL_ECMP) {
info->ecmp = true;
const CompositeNH *comp_nh = static_cast<const CompositeNH *>(nh);
// Compute out_component_nh_idx if,
// 1. out_compoenent_nh_idx was set, but points to a deleted NH
// This can happen if flow is trapped for ECMP resolution from
// vrouter
// 2. New flow being setup
// 3. If flow transitions from Non-ECMP to ECMP, the
// out_component_nh_idx is set in RewritePktInfo. We want to
// retain the index
if (info->out_component_nh_idx ==
CompositeNH::kInvalidComponentNHIdx ||
(comp_nh->GetNH(info->out_component_nh_idx) == NULL)) {
info->out_component_nh_idx = comp_nh->hash(pkt->hash());
}
nh = comp_nh->GetNH(info->out_component_nh_idx);
// TODO: Should we re-hash here?
if (nh->IsActive() == false) {
return false;
}
}
} else {
info->out_component_nh_idx = CompositeNH::kInvalidComponentNHIdx;
}
// Pick out going attributes based on the NH selected above
switch (nh->GetType()) {
case NextHop::INTERFACE:
out->intf_ = static_cast<const InterfaceNH*>(nh)->GetInterface();
if (out->intf_->type() == Interface::VM_INTERFACE) {
//Local flow, pick destination interface
//nexthop as reverse flow key
out->nh_ = out->intf_->flow_key_nh()->id();
out->vrf_ = static_cast<const InterfaceNH*>(nh)->GetVrf();
} else if (out->intf_->type() == Interface::PACKET) {
//Packet destined to pkt interface, packet originating
//from pkt0 interface will use destination interface as key
out->nh_ = in->nh_;
} else {
// Most likely a GATEWAY interface.
// Remote flow, use source interface as nexthop key
out->nh_ = nh->id();
out->vrf_ = static_cast<const InterfaceNH*>(nh)->GetVrf();
}
break;
case NextHop::RECEIVE:
assert(pkt->l3_forwarding == true);
out->intf_ = static_cast<const ReceiveNH *>(nh)->GetInterface();
out->vrf_ = out->intf_->vrf();
out->nh_ = GetPolicyDisabledNH(nh)->id();
break;
case NextHop::VLAN: {
assert(pkt->l3_forwarding == true);
const VlanNH *vlan_nh = static_cast<const VlanNH*>(nh);
out->intf_ = vlan_nh->GetInterface();
out->vlan_nh_ = true;
out->vlan_tag_ = vlan_nh->GetVlanTag();
out->vrf_ = vlan_nh->GetVrf();
out->nh_ = nh->id();
break;
}
// Destination present on remote-compute node. The reverse traffic will
// have MPLS label. The MPLS label can point to
// 1. In case of non-ECMP, label will points to local interface
// 2. In case of ECMP, label will point to ECMP of local-composite members
case NextHop::TUNNEL: {
if (pkt->l3_forwarding) {
if (pkt->family == Address::INET) {
const InetUnicastRouteEntry *rt =
static_cast<const InetUnicastRouteEntry *>(in->rt_);
if (rt != NULL && rt->GetLocalNextHop()) {
const NextHop *local_nh = rt->GetLocalNextHop();
out->nh_ = local_nh->id();
if (local_nh->GetType() == NextHop::INTERFACE) {
const Interface *local_intf =
static_cast<const InterfaceNH*>(local_nh)->GetInterface();
//Get policy enabled nexthop only for
//vm interface, in case of vgw or service interface in
//transparent mode we should still
//use policy disabled interface
if (local_intf &&
local_intf->type() == Interface::VM_INTERFACE) {
out->nh_ = GetPolicyEnabledNH(local_nh)->id();
}
}
} else {
out->nh_ = in->nh_;
}
} else {
//TODO::v6
}
} else {
// Bridged flow. ECMP not supported for L2 flows
out->nh_ = in->nh_;
}
out->intf_ = NULL;
break;
}
// COMPOSITE is valid only for multicast traffic. We simply forward
// multicast traffic and its mostly unidirectional. nh_ used in reverse
// flow woule not matter really
case NextHop::COMPOSITE: {
out->nh_ = nh->id();
out->intf_ = NULL;
break;
}
// VRF Nexthop means traffic came as tunnelled packet and interface is
// gateway kind of interface. It also means ARP is not yet resolved for the
// dest-ip (otherwise we should have it ARP-NH). Let out->nh_ to be same as
// in->nh_. It will be modified later when ARP is resolved
case NextHop::VRF: {
const VrfNH *vrf_nh = static_cast<const VrfNH *>(nh);
out->vrf_ = vrf_nh->GetVrf();
break;
}
// ARP Nexthop means outgoing interface is gateway kind of interface with
// ARP already resolved
case NextHop::ARP: {
assert(pkt->l3_forwarding == true);
const ArpNH *arp_nh = static_cast<const ArpNH *>(nh);
if (in->intf_->type() == Interface::VM_INTERFACE) {
const VmInterface *vm_intf =
static_cast<const VmInterface *>(in->intf_);
if (vm_intf->device_type() == VmInterface::LOCAL_DEVICE) {
out->nh_ = arp_nh->id();
} else {
out->nh_ = arp_nh->GetInterface()->flow_key_nh()->id();
}
}
out->intf_ = arp_nh->GetInterface();
out->vrf_ = arp_nh->GetVrf();
break;
}
// RESOLVE Nexthop means traffic came from gateway interface and destined
// to another gateway interface
case NextHop::RESOLVE: {
assert(pkt->l3_forwarding == true);
const ResolveNH *rsl_nh = static_cast<const ResolveNH *>(nh);
out->nh_ = rsl_nh->interface()->flow_key_nh()->id();
out->intf_ = rsl_nh->interface();
break;
}
default:
out->intf_ = NULL;
break;
}
if (out->intf_) {
if (!out->intf_->IsActive()) {
out->intf_ = NULL;
ret = false;
} else if (force_vmport && IsVgwOrVmInterface(out->intf_) == false) {
out->intf_ = NULL;
out->vrf_ = NULL;
ret = true;
}
}
if (out->vrf_ && (out->vrf_->IsActive() == false)) {
out->vrf_ = NULL;
ret = false;
}
return ret;
}
// Decode route and get Interface / ECMP information
static bool RouteToOutInfo(const AgentRoute *rt, const PktInfo *pkt,
PktFlowInfo *info, PktControlInfo *in,
PktControlInfo *out) {
Agent *agent = static_cast<AgentRouteTable *>(rt->get_table())->agent();
const AgentPath *path = rt->GetActivePath();
if (path == NULL)
return false;
const NextHop *nh = static_cast<const NextHop *>(path->ComputeNextHop(agent));
if (nh == NULL)
return false;
if (nh->IsActive() == false) {
return false;
}
return NhDecode(nh, pkt, info, in, out, false);
}
static const VnEntry *InterfaceToVn(const Interface *intf) {
if (intf->type() != Interface::VM_INTERFACE)
return NULL;
const VmInterface *vm_port = static_cast<const VmInterface *>(intf);
return vm_port->vn();
}
static bool IntfHasFloatingIp(PktFlowInfo *pkt_info, const Interface *intf,
Address::Family family) {
if (pkt_info->l3_flow == false)
return false;
if (!intf || intf->type() != Interface::VM_INTERFACE)
return false;
return static_cast<const VmInterface *>(intf)->HasFloatingIp(family);
}
static bool IsLinkLocalRoute(const AgentRoute *rt) {
const AgentPath *path = rt->GetActivePath();
if (path && path->peer() == Agent::GetInstance()->link_local_peer())
return true;
return false;
}
static const string *RouteToVn(const AgentRoute *rt) {
const AgentPath *path = NULL;
if (rt) {
path = rt->GetActivePath();
}
if (path == NULL) {
return &(Agent::NullString());
}
return &path->dest_vn_name();
}
static void SetInEcmpIndex(const PktInfo *pkt, PktFlowInfo *flow_info,
PktControlInfo *in, PktControlInfo *out) {
if (!in->rt_) {
return;
}
if (in->rt_->GetActiveNextHop()->GetType() != NextHop::COMPOSITE) {
return;
}
if (pkt->family == Address::INET6) {
//TODO::ECMP for v6
}
Agent *agent = static_cast<AgentRouteTable *>(in->rt_->get_table())->agent();
const InetUnicastRouteEntry *rt =
static_cast<const InetUnicastRouteEntry *>(in->rt_);
NextHop *component_nh_ptr = NULL;
uint32_t label;
//Frame key for component NH
if (flow_info->ingress) {
//Ingress flow
const VmInterface *vm_port = static_cast<const VmInterface *>(in->intf_);
const VrfEntry *vrf = agent->vrf_table()->FindVrfFromId(pkt->vrf);
if (vm_port->HasServiceVlan() && vm_port->vrf() != vrf) {
//Packet came on service VRF
label = vm_port->GetServiceVlanLabel(vrf);
uint32_t vlan = vm_port->GetServiceVlanTag(vrf);
VlanNHKey key(vm_port->GetUuid(), vlan);
component_nh_ptr =
static_cast<NextHop *>
(agent->nexthop_table()->FindActiveEntry(&key));
} else {
InterfaceNHKey key(static_cast<InterfaceKey *>
(vm_port->GetDBRequestKey().release()),
false, InterfaceNHFlags::INET4);
component_nh_ptr =
static_cast<NextHop *>
(agent->nexthop_table()->FindActiveEntry(&key));
label = vm_port->label();
}
} else {
//Packet from fabric
Ip4Address dest_ip(pkt->tunnel.ip_saddr);
TunnelNHKey key(agent->fabric_vrf_name(), agent->router_id(),
dest_ip, false, pkt->tunnel.type);
//Get component NH pointer
component_nh_ptr =
static_cast<NextHop *>
(agent->nexthop_table()->FindActiveEntry(&key));
//Get Label to be used to reach destination server
const CompositeNH *nh =
static_cast<const CompositeNH *>(rt->GetActiveNextHop());
label = nh->GetRemoteLabel(dest_ip);
}
ComponentNH component_nh(label, component_nh_ptr);
const NextHop *nh = NULL;
if (out->intf_) {
//Local destination, use active path
nh = rt->GetActiveNextHop();
} else {
//Destination on remote server
//Choose local path, which will also pointed by MPLS label
if (rt->FindPath(Agent::GetInstance()->ecmp_peer())) {
nh = rt->FindPath(agent->ecmp_peer())->ComputeNextHop(agent);
} else {
//Aggregarated routes may not have local path
//Derive local path
nh = rt->GetLocalNextHop();
}
}
flow_info->ecmp = true;
if (nh && nh->GetType() == NextHop::COMPOSITE) {
const CompositeNH *comp_nh = static_cast<const CompositeNH *>(nh);
//Find component entry index in composite NH
uint32_t idx = 0;
if (comp_nh->GetIndex(component_nh, idx)) {
flow_info->in_component_nh_idx = idx;
flow_info->ecmp = true;
}
} else {
//Ideally this case is not ecmp, as on reverse flow we are hitting
//a interface NH and not composite NH, install reverse flow for consistency
flow_info->ecmp = true;
}
}
static bool RouteAllowNatLookup(const AgentRoute *rt) {
// No NAT for bridge routes
if (dynamic_cast<const BridgeRouteEntry *>(rt) != NULL)
return false;
if (rt != NULL && IsLinkLocalRoute(rt)) {
// skip NAT lookup if found route has link local peer.
return false;
}
return true;
}
void PktFlowInfo::SetEcmpFlowInfo(const PktInfo *pkt, const PktControlInfo *in,
const PktControlInfo *out) {
nat_ip_daddr = pkt->ip_daddr;
nat_ip_saddr = pkt->ip_saddr;
nat_dport = pkt->dport;
nat_sport = pkt->sport;
if (out->intf_ && out->intf_->type() == Interface::VM_INTERFACE) {
dest_vrf = out->vrf_->vrf_id();
} else {
dest_vrf = pkt->vrf;
}
nat_vrf = dest_vrf;
nat_dest_vrf = pkt->vrf;
}
void PktFlowInfo::CheckLinkLocal(const PktInfo *pkt) {
if (!l3_flow && pkt->ip_daddr.is_v4()) {
uint16_t nat_port;
Ip4Address nat_server;
std::string service_name;
Agent *agent = flow_table->agent();
if (agent->oper_db()->global_vrouter()->
FindLinkLocalService(pkt->ip_daddr.to_v4(), pkt->dport,
&service_name, &nat_server, &nat_port)) {
// it is link local service request, treat it as l3
l3_flow = true;
pkt->l3_forwarding = true;
}
}
}
// For link local services, we bind to a local port & use it as NAT source port.
// The socket is closed when the flow entry is deleted.
uint32_t PktFlowInfo::LinkLocalBindPort(const VmEntry *vm, uint8_t proto) {
if (vm == NULL)
return 0;
// Do not allow more than max link local flows
if (flow_table->linklocal_flow_count() >=
flow_table->agent()->params()->linklocal_system_flows())
return 0;
if (flow_table->VmLinkLocalFlowCount(vm) >=
flow_table->agent()->params()->linklocal_vm_flows())
return 0;
if (proto == IPPROTO_TCP) {
linklocal_src_port_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
} else if (proto == IPPROTO_UDP) {
linklocal_src_port_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
}
if (linklocal_src_port_fd == -1) {
return 0;
}
// allow the socket to be reused upon close
int optval = 1;
setsockopt(linklocal_src_port_fd, SOL_SOCKET, SO_REUSEADDR,
&optval, sizeof(optval));
struct sockaddr_in address;
memset(&address, '0', sizeof(address));
address.sin_family = AF_INET;
address.sin_addr.s_addr = 0;
address.sin_port = 0;
struct sockaddr_in bound_to;
socklen_t len = sizeof(bound_to);
if (bind(linklocal_src_port_fd, (struct sockaddr*) &address,
sizeof(address)) == -1) {
goto error;
}
if (getsockname(linklocal_src_port_fd, (struct sockaddr*) &bound_to,
&len) == -1) {
goto error;
}
return ntohs(bound_to.sin_port);
error:
if (linklocal_src_port_fd != kLinkLocalInvalidFd) {
close(linklocal_src_port_fd);
linklocal_src_port_fd = kLinkLocalInvalidFd;
}
return 0;
}
void PktFlowInfo::LinkLocalServiceFromVm(const PktInfo *pkt, PktControlInfo *in,
PktControlInfo *out) {
// Link local services supported only for IPv4 for now
if (pkt->family != Address::INET) {
in->rt_ = NULL;
out->rt_ = NULL;
return;
}
const VmInterface *vm_port =
static_cast<const VmInterface *>(in->intf_);
uint16_t nat_port;
Ip4Address nat_server;
std::string service_name;
if (!Agent::GetInstance()->oper_db()->global_vrouter()->
FindLinkLocalService(pkt->ip_daddr.to_v4(), pkt->dport,
&service_name, &nat_server, &nat_port)) {
// link local service not configured, drop the request
in->rt_ = NULL;
out->rt_ = NULL;
return;
}
out->vrf_ = Agent::GetInstance()->vrf_table()->
FindVrfFromName(Agent::GetInstance()->fabric_vrf_name());
dest_vrf = out->vrf_->vrf_id();
// Set NAT flow fields
linklocal_flow = true;
nat_done = true;
if (nat_server == Agent::GetInstance()->router_id()) {
// In case of metadata or when link local destination is local host,
// set VM's metadata address as NAT source address. This is required
// to avoid response from the linklocal service being looped back and
// the packet not coming to vrouter for reverse NAT.
// Destination would be local host (FindLinkLocalService returns this)
nat_ip_saddr = vm_port->mdata_ip_addr();
// Services such as metadata will run on compute_node_ip. Set nat
// address to compute_node_ip
nat_server = Agent::GetInstance()->compute_node_ip();
nat_sport = pkt->sport;
} else {
nat_ip_saddr = Agent::GetInstance()->router_id();
// we bind to a local port & use it as NAT source port (cannot use
// incoming src port); init here and bind in Add;
nat_sport = 0;
linklocal_bind_local_port = true;
}
nat_ip_daddr = nat_server;
nat_dport = nat_port;
nat_vrf = dest_vrf;
nat_dest_vrf = vm_port->vrf_id();
out->rt_ = Agent::GetInstance()->pkt()->flow_table()->GetUcRoute(out->vrf_,
nat_server);
return;
}
void PktFlowInfo::LinkLocalServiceFromHost(const PktInfo *pkt, PktControlInfo *in,
PktControlInfo *out) {
if (RouteToOutInfo(out->rt_, pkt, this, in, out) == false) {
return;
}
// Link local services supported only for IPv4 for now
if (pkt->family != Address::INET) {
in->rt_ = NULL;
out->rt_ = NULL;
return;
}
const VmInterface *vm_port =
static_cast<const VmInterface *>(out->intf_);
if (vm_port == NULL) {
// Force implicit deny
in->rt_ = NULL;
out->rt_ = NULL;
return;
}
// Check if packet is destined to metadata of interface
if (pkt->ip_daddr.to_v4() != vm_port->mdata_ip_addr()) {
// Force implicit deny
in->rt_ = NULL;
out->rt_ = NULL;
return;
}
dest_vrf = vm_port->vrf_id();
out->vrf_ = vm_port->vrf();
linklocal_flow = true;
nat_done = true;
nat_ip_saddr = Ip4Address(METADATA_IP_ADDR);
nat_ip_daddr = vm_port->primary_ip_addr();
nat_dport = pkt->dport;
if (pkt->sport == Agent::GetInstance()->metadata_server_port()) {
nat_sport = METADATA_NAT_PORT;
} else {
nat_sport = pkt->sport;
}
nat_vrf = dest_vrf;
nat_dest_vrf = pkt->vrf;
return;
}
void PktFlowInfo::LinkLocalServiceTranslate(const PktInfo *pkt, PktControlInfo *in,
PktControlInfo *out) {
if (in->intf_->type() == Interface::VM_INTERFACE) {
LinkLocalServiceFromVm(pkt, in, out);
} else {
LinkLocalServiceFromHost(pkt, in, out);
}
}
// DestNAT for packets entering into a VM with floating-ip.
// Can come here in two paths,
// - Packet originated on local vm.
// - Packet originated from remote vm
void PktFlowInfo::FloatingIpDNat(const PktInfo *pkt, PktControlInfo *in,
PktControlInfo *out) {
const VmInterface *vm_port =
static_cast<const VmInterface *>(out->intf_);
const VmInterface::FloatingIpSet &fip_list =
vm_port->floating_ip_list().list_;
// We must NAT if the IP-DA is not same as Primary-IP on interface
if (pkt->ip_daddr.to_v4() == vm_port->primary_ip_addr()) {
return;
}
// Look for matching floating-ip
VmInterface::FloatingIpSet::const_iterator it = fip_list.begin();
for ( ; it != fip_list.end(); ++it) {
if (it->vrf_.get() == NULL) {
continue;
}
if (pkt->ip_daddr.to_v4() == it->floating_ip_) {
break;
}
}
if (it == fip_list.end()) {
// No matching floating ip for destination-ip
return;
}
in->vn_ = NULL;
if (nat_done == false) {
UpdateRoute(&in->rt_, it->vrf_.get(), pkt->ip_saddr, pkt->smac,
flow_source_plen_map);
nat_dest_vrf = it->vrf_.get()->vrf_id();
}
UpdateRoute(&out->rt_, it->vrf_.get(), pkt->ip_daddr, pkt->dmac,
flow_dest_plen_map);
out->vn_ = it->vn_.get();
dest_vrf = out->intf_->vrf()->vrf_id();
// Translate the Dest-IP
if (nat_done == false)
nat_ip_saddr = pkt->ip_saddr;
nat_ip_daddr = vm_port->primary_ip_addr();
nat_sport = pkt->sport;
nat_dport = pkt->dport;
nat_vrf = dest_vrf;
nat_done = true;
if (in->rt_) {
flow_source_vrf = static_cast<const AgentRoute *>(in->rt_)->vrf_id();
} else {
flow_source_vrf = VrfEntry::kInvalidIndex;
}
flow_dest_vrf = it->vrf_.get()->vrf_id();
// Update fields required for floating-IP stats accounting
fip_dnat = true;
return;
}
void PktFlowInfo::FloatingIpSNat(const PktInfo *pkt, PktControlInfo *in,
PktControlInfo *out) {
if (pkt->family == Address::INET6) {
return;
//TODO: V6 FIP
}
const VmInterface *intf =
static_cast<const VmInterface *>(in->intf_);
const VmInterface::FloatingIpSet &fip_list = intf->floating_ip_list().list_;
VmInterface::FloatingIpSet::const_iterator it = fip_list.begin();
VmInterface::FloatingIpSet::const_iterator fip_it = fip_list.end();
FlowTable *ftable = Agent::GetInstance()->pkt()->flow_table();
const AgentRoute *rt = out->rt_;
bool change = false;
// Find Floating-IP matching destination-ip
for ( ; it != fip_list.end(); ++it) {
if (it->vrf_.get() == NULL) {
continue;
}
const AgentRoute *rt_match = ftable->GetUcRoute(it->vrf_.get(),
pkt->ip_daddr);
if (rt_match == NULL) {
flow_dest_plen_map[it->vrf_.get()->vrf_id()] = 0;
continue;
}
uint8_t out_rt_plen = RouteToPrefixLen(out->rt_);
uint8_t rt_match_plen = RouteToPrefixLen(rt_match);
// found the route match
// prefer the route with longest prefix match
// if prefix length is same prefer route from floating IP
// if routes are from fip of difference VRF, prefer the one with lower name.
// if both the selected and current FIP is from same vrf prefer the one with lower ip addr.
if (out->rt_ == NULL || rt_match_plen > out_rt_plen) {
change = true;
} else if (rt_match_plen == out_rt_plen) {
if (fip_it == fip_list.end()) {
change = true;
} else if (rt_match->vrf()->GetName() < out->rt_->vrf()->GetName()) {
change = true;
} else if (rt_match->vrf()->GetName() == out->rt_->vrf()->GetName() &&
it->floating_ip_ < fip_it->floating_ip_) {
change = true;
}
}
if (change) {
if (out->rt_ != NULL) {
flow_dest_plen_map[out->rt_->vrf_id()] = RouteToPrefixLen(out->rt_);
}
out->rt_ = rt_match;
fip_it = it;
change = false;
} else {
flow_dest_plen_map[rt_match->vrf_id()] = RouteToPrefixLen(rt_match);
}
}
if (out->rt_ == rt) {
// No change in route, no floating-ip found
return;
}
//Populate in->vn, used for VRF translate ACL lookup
in->vn_ = fip_it->vn_.get();
// Floating-ip found. We will change src-ip to floating-ip. Recompute route
// for new source-ip. All policy decisions will be based on this new route
UpdateRoute(&in->rt_, fip_it->vrf_.get(), fip_it->floating_ip_, pkt->smac,
flow_source_plen_map);
if (in->rt_ == NULL) {
return;
}
if (VrfTranslate(pkt, in, out, fip_it->floating_ip_, true) == false) {
return;
}
if (out->rt_ == NULL || in->rt_ == NULL) {
//If After VRF translation, ingress route or
//egress route is NULL, mark the flow as short flow
return;
}
// Compute out-intf and ECMP info from out-route
if (RouteToOutInfo(out->rt_, pkt, this, in, out) == false) {
return;
}
dest_vrf = out->rt_->vrf_id();
// Setup reverse flow to translate sip.
nat_done = true;
nat_ip_saddr = fip_it->floating_ip_;
nat_ip_daddr = pkt->ip_daddr;
nat_sport = pkt->sport;
nat_dport = pkt->dport;
// Compute VRF for reverse flow
if (out->intf_) {
// Egress-vm present on same compute node, take VRF from vm-port
nat_vrf = out->vrf_->vrf_id();
out->vn_ = InterfaceToVn(out->intf_);
} else {
// Egress-vm is remote. Find VRF from the NH for source-ip
nat_vrf = NhToVrf(in->rt_->GetActiveNextHop());
}
// Dest VRF for reverse flow is In-Port VRF
nat_dest_vrf = intf->vrf_id();
flow_source_vrf = pkt->vrf;
if (out->rt_) {
flow_dest_vrf = dest_vrf;
} else {
flow_dest_vrf = VrfEntry::kInvalidIndex;
}
// Update fields required for floating-IP stats accounting
snat_fip = nat_ip_saddr;
fip_snat = true;
return;
}
bool PktFlowInfo::VrfTranslate(const PktInfo *pkt, PktControlInfo *in,
PktControlInfo *out, const IpAddress &src_ip,
bool nat_flow) {
const Interface *intf = NULL;
if (ingress) {
intf = in->intf_;
} else {
intf = out->intf_;
}
if (!intf || intf->type() != Interface::VM_INTERFACE) {
return true;
}
const VmInterface *vm_intf = static_cast<const VmInterface *>(intf);
//If interface has a VRF assign rule, choose the acl and match the
//packet, else get the acl attached to VN and try matching the packet to
//network acl
const AclDBEntry *acl = NULL;
if (nat_flow == false) {
acl = vm_intf->vrf_assign_acl();
}
//In case of floating IP translation, dont apply
//interface VRF assign rule
if (acl == NULL) {
if (ingress && in->vn_) {
//Check if the network ACL is present
acl = in->vn_->GetAcl();
} else if (out->vn_) {
acl = out->vn_->GetAcl();
}
}
if (!acl) {
return true;
}
PacketHeader hdr;
hdr.vrf = pkt->vrf;
hdr.src_ip = src_ip;
hdr.dst_ip = pkt->ip_daddr;
hdr.protocol = pkt->ip_proto;
if (hdr.protocol == IPPROTO_UDP || hdr.protocol == IPPROTO_TCP) {
hdr.src_port = pkt->sport;
hdr.dst_port = pkt->dport;
} else {
hdr.src_port = 0;
hdr.dst_port = 0;
}
hdr.src_policy_id = RouteToVn(in->rt_);
hdr.dst_policy_id = RouteToVn(out->rt_);
if (in->rt_) {
const AgentPath *path = in->rt_->GetActivePath();
hdr.src_sg_id_l = &(path->sg_list());
}
if (out->rt_) {
const AgentPath *path = out->rt_->GetActivePath();
hdr.dst_sg_id_l = &(path->sg_list());
}
MatchAclParams match_acl_param;
if (!acl->PacketMatch(hdr, match_acl_param, NULL)) {
return true;
}
if (match_acl_param.action_info.vrf_translate_action_.vrf_name() != "") {
VrfKey key(match_acl_param.action_info.vrf_translate_action_.vrf_name());
const VrfEntry *vrf = static_cast<const VrfEntry*>
(Agent::GetInstance()->vrf_table()->FindActiveEntry(&key));
if (vrf == NULL) {
short_flow = true;
short_flow_reason = FlowEntry::SHORT_UNAVIALABLE_VRF;
in->rt_ = NULL;