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google/netstack
tcpip/stack/stack.go
SetNetworkProtocolOption
func (s *Stack) SetNetworkProtocolOption(network tcpip.NetworkProtocolNumber, option interface{}) *tcpip.Error { netProto, ok := s.networkProtocols[network] if !ok { return tcpip.ErrUnknownProtocol } return netProto.SetOption(option) }
go
func (s *Stack) SetNetworkProtocolOption(network tcpip.NetworkProtocolNumber, option interface{}) *tcpip.Error { netProto, ok := s.networkProtocols[network] if !ok { return tcpip.ErrUnknownProtocol } return netProto.SetOption(option) }
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// SetNetworkProtocolOption allows configuring individual protocol level // options. This method returns an error if the protocol is not supported or // option is not supported by the protocol implementation or the provided value // is incorrect.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L400-L406
train
google/netstack
tcpip/stack/stack.go
SetTransportProtocolOption
func (s *Stack) SetTransportProtocolOption(transport tcpip.TransportProtocolNumber, option interface{}) *tcpip.Error { transProtoState, ok := s.transportProtocols[transport] if !ok { return tcpip.ErrUnknownProtocol } return transProtoState.proto.SetOption(option) }
go
func (s *Stack) SetTransportProtocolOption(transport tcpip.TransportProtocolNumber, option interface{}) *tcpip.Error { transProtoState, ok := s.transportProtocols[transport] if !ok { return tcpip.ErrUnknownProtocol } return transProtoState.proto.SetOption(option) }
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// SetTransportProtocolOption allows configuring individual protocol level // options. This method returns an error if the protocol is not supported or // option is not supported by the protocol implementation or the provided value // is incorrect.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L429-L435
train
google/netstack
tcpip/stack/stack.go
SetTransportProtocolHandler
func (s *Stack) SetTransportProtocolHandler(p tcpip.TransportProtocolNumber, h func(*Route, TransportEndpointID, buffer.View, buffer.VectorisedView) bool) { state := s.transportProtocols[p] if state != nil { state.defaultHandler = h } }
go
func (s *Stack) SetTransportProtocolHandler(p tcpip.TransportProtocolNumber, h func(*Route, TransportEndpointID, buffer.View, buffer.VectorisedView) bool) { state := s.transportProtocols[p] if state != nil { state.defaultHandler = h } }
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// SetTransportProtocolHandler sets the per-stack default handler for the given // protocol. // // It must be called only during initialization of the stack. Changing it as the // stack is operating is not supported.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L457-L462
train
google/netstack
tcpip/stack/stack.go
SetForwarding
func (s *Stack) SetForwarding(enable bool) { // TODO(igudger, bgeffon): Expose via /proc/sys/net/ipv4/ip_forward. s.mu.Lock() s.forwarding = enable s.mu.Unlock() }
go
func (s *Stack) SetForwarding(enable bool) { // TODO(igudger, bgeffon): Expose via /proc/sys/net/ipv4/ip_forward. s.mu.Lock() s.forwarding = enable s.mu.Unlock() }
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// SetForwarding enables or disables the packet forwarding between NICs.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L478-L483
train
google/netstack
tcpip/stack/stack.go
Forwarding
func (s *Stack) Forwarding() bool { // TODO(igudger, bgeffon): Expose via /proc/sys/net/ipv4/ip_forward. s.mu.RLock() defer s.mu.RUnlock() return s.forwarding }
go
func (s *Stack) Forwarding() bool { // TODO(igudger, bgeffon): Expose via /proc/sys/net/ipv4/ip_forward. s.mu.RLock() defer s.mu.RUnlock() return s.forwarding }
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// Forwarding returns if the packet forwarding between NICs is enabled.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L486-L491
train
google/netstack
tcpip/stack/stack.go
SetRouteTable
func (s *Stack) SetRouteTable(table []tcpip.Route) { s.mu.Lock() defer s.mu.Unlock() s.routeTable = table }
go
func (s *Stack) SetRouteTable(table []tcpip.Route) { s.mu.Lock() defer s.mu.Unlock() s.routeTable = table }
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// SetRouteTable assigns the route table to be used by this stack. It // specifies which NIC to use for given destination address ranges.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L495-L500
train
google/netstack
tcpip/stack/stack.go
GetRouteTable
func (s *Stack) GetRouteTable() []tcpip.Route { s.mu.Lock() defer s.mu.Unlock() return append([]tcpip.Route(nil), s.routeTable...) }
go
func (s *Stack) GetRouteTable() []tcpip.Route { s.mu.Lock() defer s.mu.Unlock() return append([]tcpip.Route(nil), s.routeTable...) }
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// GetRouteTable returns the route table which is currently in use.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L503-L507
train
google/netstack
tcpip/stack/stack.go
NewRawEndpoint
func (s *Stack) NewRawEndpoint(transport tcpip.TransportProtocolNumber, network tcpip.NetworkProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) { if !s.raw { return nil, tcpip.ErrNotPermitted } t, ok := s.transportProtocols[transport] if !ok { return nil, tcpip.ErrUnknownProtocol } return t.proto.NewRawEndpoint(s, network, waiterQueue) }
go
func (s *Stack) NewRawEndpoint(transport tcpip.TransportProtocolNumber, network tcpip.NetworkProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) { if !s.raw { return nil, tcpip.ErrNotPermitted } t, ok := s.transportProtocols[transport] if !ok { return nil, tcpip.ErrUnknownProtocol } return t.proto.NewRawEndpoint(s, network, waiterQueue) }
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// NewRawEndpoint creates a new raw transport layer endpoint of the given // protocol. Raw endpoints receive all traffic for a given protocol regardless // of address.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L522-L533
train
google/netstack
tcpip/stack/stack.go
createNIC
func (s *Stack) createNIC(id tcpip.NICID, name string, linkEP tcpip.LinkEndpointID, enabled, loopback bool) *tcpip.Error { ep := FindLinkEndpoint(linkEP) if ep == nil { return tcpip.ErrBadLinkEndpoint } s.mu.Lock() defer s.mu.Unlock() // Make sure id is unique. if _, ok := s.nics[id]; ok { return tcpip.ErrDuplicateNICID } n := newNIC(s, id, name, ep, loopback) s.nics[id] = n if enabled { n.attachLinkEndpoint() } return nil }
go
func (s *Stack) createNIC(id tcpip.NICID, name string, linkEP tcpip.LinkEndpointID, enabled, loopback bool) *tcpip.Error { ep := FindLinkEndpoint(linkEP) if ep == nil { return tcpip.ErrBadLinkEndpoint } s.mu.Lock() defer s.mu.Unlock() // Make sure id is unique. if _, ok := s.nics[id]; ok { return tcpip.ErrDuplicateNICID } n := newNIC(s, id, name, ep, loopback) s.nics[id] = n if enabled { n.attachLinkEndpoint() } return nil }
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// createNIC creates a NIC with the provided id and link-layer endpoint, and // optionally enable it.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L537-L559
train
google/netstack
tcpip/stack/stack.go
CreateNIC
func (s *Stack) CreateNIC(id tcpip.NICID, linkEP tcpip.LinkEndpointID) *tcpip.Error { return s.createNIC(id, "", linkEP, true, false) }
go
func (s *Stack) CreateNIC(id tcpip.NICID, linkEP tcpip.LinkEndpointID) *tcpip.Error { return s.createNIC(id, "", linkEP, true, false) }
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// CreateNIC creates a NIC with the provided id and link-layer endpoint.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L562-L564
train
google/netstack
tcpip/stack/stack.go
CreateNamedNIC
func (s *Stack) CreateNamedNIC(id tcpip.NICID, name string, linkEP tcpip.LinkEndpointID) *tcpip.Error { return s.createNIC(id, name, linkEP, true, false) }
go
func (s *Stack) CreateNamedNIC(id tcpip.NICID, name string, linkEP tcpip.LinkEndpointID) *tcpip.Error { return s.createNIC(id, name, linkEP, true, false) }
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// CreateNamedNIC creates a NIC with the provided id and link-layer endpoint, // and a human-readable name.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L568-L570
train
google/netstack
tcpip/stack/stack.go
CreateDisabledNIC
func (s *Stack) CreateDisabledNIC(id tcpip.NICID, linkEP tcpip.LinkEndpointID) *tcpip.Error { return s.createNIC(id, "", linkEP, false, false) }
go
func (s *Stack) CreateDisabledNIC(id tcpip.NICID, linkEP tcpip.LinkEndpointID) *tcpip.Error { return s.createNIC(id, "", linkEP, false, false) }
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// CreateDisabledNIC creates a NIC with the provided id and link-layer endpoint, // but leave it disable. Stack.EnableNIC must be called before the link-layer // endpoint starts delivering packets to it.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L581-L583
train
google/netstack
tcpip/stack/stack.go
EnableNIC
func (s *Stack) EnableNIC(id tcpip.NICID) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[id] if nic == nil { return tcpip.ErrUnknownNICID } nic.attachLinkEndpoint() return nil }
go
func (s *Stack) EnableNIC(id tcpip.NICID) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[id] if nic == nil { return tcpip.ErrUnknownNICID } nic.attachLinkEndpoint() return nil }
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// EnableNIC enables the given NIC so that the link-layer endpoint can start // delivering packets to it.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L593-L605
train
google/netstack
tcpip/stack/stack.go
CheckNIC
func (s *Stack) CheckNIC(id tcpip.NICID) bool { s.mu.RLock() nic, ok := s.nics[id] s.mu.RUnlock() if ok { return nic.linkEP.IsAttached() } return false }
go
func (s *Stack) CheckNIC(id tcpip.NICID) bool { s.mu.RLock() nic, ok := s.nics[id] s.mu.RUnlock() if ok { return nic.linkEP.IsAttached() } return false }
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// CheckNIC checks if a NIC is usable.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L608-L616
train
google/netstack
tcpip/stack/stack.go
NICSubnets
func (s *Stack) NICSubnets() map[tcpip.NICID][]tcpip.Subnet { s.mu.RLock() defer s.mu.RUnlock() nics := map[tcpip.NICID][]tcpip.Subnet{} for id, nic := range s.nics { nics[id] = append(nics[id], nic.Subnets()...) } return nics }
go
func (s *Stack) NICSubnets() map[tcpip.NICID][]tcpip.Subnet { s.mu.RLock() defer s.mu.RUnlock() nics := map[tcpip.NICID][]tcpip.Subnet{} for id, nic := range s.nics { nics[id] = append(nics[id], nic.Subnets()...) } return nics }
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// NICSubnets returns a map of NICIDs to their associated subnets.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L619-L629
train
google/netstack
tcpip/stack/stack.go
NICInfo
func (s *Stack) NICInfo() map[tcpip.NICID]NICInfo { s.mu.RLock() defer s.mu.RUnlock() nics := make(map[tcpip.NICID]NICInfo) for id, nic := range s.nics { flags := NICStateFlags{ Up: true, // Netstack interfaces are always up. Running: nic.linkEP.IsAttached(), Promiscuous: nic.isPromiscuousMode(), Loopback: nic.linkEP.Capabilities()&CapabilityLoopback != 0, } nics[id] = NICInfo{ Name: nic.name, LinkAddress: nic.linkEP.LinkAddress(), ProtocolAddresses: nic.Addresses(), Flags: flags, MTU: nic.linkEP.MTU(), Stats: nic.stats, } } return nics }
go
func (s *Stack) NICInfo() map[tcpip.NICID]NICInfo { s.mu.RLock() defer s.mu.RUnlock() nics := make(map[tcpip.NICID]NICInfo) for id, nic := range s.nics { flags := NICStateFlags{ Up: true, // Netstack interfaces are always up. Running: nic.linkEP.IsAttached(), Promiscuous: nic.isPromiscuousMode(), Loopback: nic.linkEP.Capabilities()&CapabilityLoopback != 0, } nics[id] = NICInfo{ Name: nic.name, LinkAddress: nic.linkEP.LinkAddress(), ProtocolAddresses: nic.Addresses(), Flags: flags, MTU: nic.linkEP.MTU(), Stats: nic.stats, } } return nics }
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// NICInfo returns a map of NICIDs to their associated information.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L647-L669
train
google/netstack
tcpip/stack/stack.go
AddAddress
func (s *Stack) AddAddress(id tcpip.NICID, protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) *tcpip.Error { return s.AddAddressWithOptions(id, protocol, addr, CanBePrimaryEndpoint) }
go
func (s *Stack) AddAddress(id tcpip.NICID, protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) *tcpip.Error { return s.AddAddressWithOptions(id, protocol, addr, CanBePrimaryEndpoint) }
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// AddAddress adds a new network-layer address to the specified NIC.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L687-L689
train
google/netstack
tcpip/stack/stack.go
AddSubnet
func (s *Stack) AddSubnet(id tcpip.NICID, protocol tcpip.NetworkProtocolNumber, subnet tcpip.Subnet) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() if nic, ok := s.nics[id]; ok { nic.AddSubnet(protocol, subnet) return nil } return tcpip.ErrUnknownNICID }
go
func (s *Stack) AddSubnet(id tcpip.NICID, protocol tcpip.NetworkProtocolNumber, subnet tcpip.Subnet) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() if nic, ok := s.nics[id]; ok { nic.AddSubnet(protocol, subnet) return nil } return tcpip.ErrUnknownNICID }
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// AddSubnet adds a subnet range to the specified NIC.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L706-L716
train
google/netstack
tcpip/stack/stack.go
RemoveAddress
func (s *Stack) RemoveAddress(id tcpip.NICID, addr tcpip.Address) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() if nic, ok := s.nics[id]; ok { return nic.RemoveAddress(addr) } return tcpip.ErrUnknownNICID }
go
func (s *Stack) RemoveAddress(id tcpip.NICID, addr tcpip.Address) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() if nic, ok := s.nics[id]; ok { return nic.RemoveAddress(addr) } return tcpip.ErrUnknownNICID }
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// RemoveAddress removes an existing network-layer address from the specified // NIC.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L746-L755
train
google/netstack
tcpip/stack/stack.go
CheckNetworkProtocol
func (s *Stack) CheckNetworkProtocol(protocol tcpip.NetworkProtocolNumber) bool { _, ok := s.networkProtocols[protocol] return ok }
go
func (s *Stack) CheckNetworkProtocol(protocol tcpip.NetworkProtocolNumber) bool { _, ok := s.networkProtocols[protocol] return ok }
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// CheckNetworkProtocol checks if a given network protocol is enabled in the // stack.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L826-L829
train
google/netstack
tcpip/stack/stack.go
CheckLocalAddress
func (s *Stack) CheckLocalAddress(nicid tcpip.NICID, protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) tcpip.NICID { s.mu.RLock() defer s.mu.RUnlock() // If a NIC is specified, we try to find the address there only. if nicid != 0 { nic := s.nics[nicid] if nic == nil { return 0 } ref := nic.findEndpoint(protocol, addr, CanBePrimaryEndpoint) if ref == nil { return 0 } ref.decRef() return nic.id } // Go through all the NICs. for _, nic := range s.nics { ref := nic.findEndpoint(protocol, addr, CanBePrimaryEndpoint) if ref != nil { ref.decRef() return nic.id } } return 0 }
go
func (s *Stack) CheckLocalAddress(nicid tcpip.NICID, protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) tcpip.NICID { s.mu.RLock() defer s.mu.RUnlock() // If a NIC is specified, we try to find the address there only. if nicid != 0 { nic := s.nics[nicid] if nic == nil { return 0 } ref := nic.findEndpoint(protocol, addr, CanBePrimaryEndpoint) if ref == nil { return 0 } ref.decRef() return nic.id } // Go through all the NICs. for _, nic := range s.nics { ref := nic.findEndpoint(protocol, addr, CanBePrimaryEndpoint) if ref != nil { ref.decRef() return nic.id } } return 0 }
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// CheckLocalAddress determines if the given local address exists, and if it // does, returns the id of the NIC it's bound to. Returns 0 if the address // does not exist.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L834-L865
train
google/netstack
tcpip/stack/stack.go
SetPromiscuousMode
func (s *Stack) SetPromiscuousMode(nicID tcpip.NICID, enable bool) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic == nil { return tcpip.ErrUnknownNICID } nic.setPromiscuousMode(enable) return nil }
go
func (s *Stack) SetPromiscuousMode(nicID tcpip.NICID, enable bool) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic == nil { return tcpip.ErrUnknownNICID } nic.setPromiscuousMode(enable) return nil }
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// SetPromiscuousMode enables or disables promiscuous mode in the given NIC.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L868-L880
train
google/netstack
tcpip/stack/stack.go
SetSpoofing
func (s *Stack) SetSpoofing(nicID tcpip.NICID, enable bool) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic == nil { return tcpip.ErrUnknownNICID } nic.setSpoofing(enable) return nil }
go
func (s *Stack) SetSpoofing(nicID tcpip.NICID, enable bool) *tcpip.Error { s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic == nil { return tcpip.ErrUnknownNICID } nic.setSpoofing(enable) return nil }
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// SetSpoofing enables or disables address spoofing in the given NIC, allowing // endpoints to bind to any address in the NIC.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L884-L896
train
google/netstack
tcpip/stack/stack.go
AddLinkAddress
func (s *Stack) AddLinkAddress(nicid tcpip.NICID, addr tcpip.Address, linkAddr tcpip.LinkAddress) { fullAddr := tcpip.FullAddress{NIC: nicid, Addr: addr} s.linkAddrCache.add(fullAddr, linkAddr) // TODO: provide a way for a transport endpoint to receive a signal // that AddLinkAddress for a particular address has been called. }
go
func (s *Stack) AddLinkAddress(nicid tcpip.NICID, addr tcpip.Address, linkAddr tcpip.LinkAddress) { fullAddr := tcpip.FullAddress{NIC: nicid, Addr: addr} s.linkAddrCache.add(fullAddr, linkAddr) // TODO: provide a way for a transport endpoint to receive a signal // that AddLinkAddress for a particular address has been called. }
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// AddLinkAddress adds a link address to the stack link cache.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L899-L904
train
google/netstack
tcpip/stack/stack.go
GetLinkAddress
func (s *Stack) GetLinkAddress(nicid tcpip.NICID, addr, localAddr tcpip.Address, protocol tcpip.NetworkProtocolNumber, waker *sleep.Waker) (tcpip.LinkAddress, <-chan struct{}, *tcpip.Error) { s.mu.RLock() nic := s.nics[nicid] if nic == nil { s.mu.RUnlock() return "", nil, tcpip.ErrUnknownNICID } s.mu.RUnlock() fullAddr := tcpip.FullAddress{NIC: nicid, Addr: addr} linkRes := s.linkAddrResolvers[protocol] return s.linkAddrCache.get(fullAddr, linkRes, localAddr, nic.linkEP, waker) }
go
func (s *Stack) GetLinkAddress(nicid tcpip.NICID, addr, localAddr tcpip.Address, protocol tcpip.NetworkProtocolNumber, waker *sleep.Waker) (tcpip.LinkAddress, <-chan struct{}, *tcpip.Error) { s.mu.RLock() nic := s.nics[nicid] if nic == nil { s.mu.RUnlock() return "", nil, tcpip.ErrUnknownNICID } s.mu.RUnlock() fullAddr := tcpip.FullAddress{NIC: nicid, Addr: addr} linkRes := s.linkAddrResolvers[protocol] return s.linkAddrCache.get(fullAddr, linkRes, localAddr, nic.linkEP, waker) }
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// GetLinkAddress implements LinkAddressCache.GetLinkAddress.
[ "GetLinkAddress", "implements", "LinkAddressCache", ".", "GetLinkAddress", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L907-L919
train
google/netstack
tcpip/stack/stack.go
RemoveWaker
func (s *Stack) RemoveWaker(nicid tcpip.NICID, addr tcpip.Address, waker *sleep.Waker) { s.mu.RLock() defer s.mu.RUnlock() if nic := s.nics[nicid]; nic == nil { fullAddr := tcpip.FullAddress{NIC: nicid, Addr: addr} s.linkAddrCache.removeWaker(fullAddr, waker) } }
go
func (s *Stack) RemoveWaker(nicid tcpip.NICID, addr tcpip.Address, waker *sleep.Waker) { s.mu.RLock() defer s.mu.RUnlock() if nic := s.nics[nicid]; nic == nil { fullAddr := tcpip.FullAddress{NIC: nicid, Addr: addr} s.linkAddrCache.removeWaker(fullAddr, waker) } }
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// RemoveWaker implements LinkAddressCache.RemoveWaker.
[ "RemoveWaker", "implements", "LinkAddressCache", ".", "RemoveWaker", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L922-L930
train
google/netstack
tcpip/stack/stack.go
RegisterTransportEndpoint
func (s *Stack) RegisterTransportEndpoint(nicID tcpip.NICID, netProtos []tcpip.NetworkProtocolNumber, protocol tcpip.TransportProtocolNumber, id TransportEndpointID, ep TransportEndpoint, reusePort bool) *tcpip.Error { if nicID == 0 { return s.demux.registerEndpoint(netProtos, protocol, id, ep, reusePort) } s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic == nil { return tcpip.ErrUnknownNICID } return nic.demux.registerEndpoint(netProtos, protocol, id, ep, reusePort) }
go
func (s *Stack) RegisterTransportEndpoint(nicID tcpip.NICID, netProtos []tcpip.NetworkProtocolNumber, protocol tcpip.TransportProtocolNumber, id TransportEndpointID, ep TransportEndpoint, reusePort bool) *tcpip.Error { if nicID == 0 { return s.demux.registerEndpoint(netProtos, protocol, id, ep, reusePort) } s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic == nil { return tcpip.ErrUnknownNICID } return nic.demux.registerEndpoint(netProtos, protocol, id, ep, reusePort) }
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// RegisterTransportEndpoint registers the given endpoint with the stack // transport dispatcher. Received packets that match the provided id will be // delivered to the given endpoint; specifying a nic is optional, but // nic-specific IDs have precedence over global ones.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L936-L950
train
google/netstack
tcpip/stack/stack.go
UnregisterTransportEndpoint
func (s *Stack) UnregisterTransportEndpoint(nicID tcpip.NICID, netProtos []tcpip.NetworkProtocolNumber, protocol tcpip.TransportProtocolNumber, id TransportEndpointID, ep TransportEndpoint) { if nicID == 0 { s.demux.unregisterEndpoint(netProtos, protocol, id, ep) return } s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic != nil { nic.demux.unregisterEndpoint(netProtos, protocol, id, ep) } }
go
func (s *Stack) UnregisterTransportEndpoint(nicID tcpip.NICID, netProtos []tcpip.NetworkProtocolNumber, protocol tcpip.TransportProtocolNumber, id TransportEndpointID, ep TransportEndpoint) { if nicID == 0 { s.demux.unregisterEndpoint(netProtos, protocol, id, ep) return } s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic != nil { nic.demux.unregisterEndpoint(netProtos, protocol, id, ep) } }
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// UnregisterTransportEndpoint removes the endpoint with the given id from the // stack transport dispatcher.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L954-L967
train
google/netstack
tcpip/stack/stack.go
RegisterRawTransportEndpoint
func (s *Stack) RegisterRawTransportEndpoint(nicID tcpip.NICID, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, ep RawTransportEndpoint) *tcpip.Error { if nicID == 0 { return s.demux.registerRawEndpoint(netProto, transProto, ep) } s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic == nil { return tcpip.ErrUnknownNICID } return nic.demux.registerRawEndpoint(netProto, transProto, ep) }
go
func (s *Stack) RegisterRawTransportEndpoint(nicID tcpip.NICID, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, ep RawTransportEndpoint) *tcpip.Error { if nicID == 0 { return s.demux.registerRawEndpoint(netProto, transProto, ep) } s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic == nil { return tcpip.ErrUnknownNICID } return nic.demux.registerRawEndpoint(netProto, transProto, ep) }
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// RegisterRawTransportEndpoint registers the given endpoint with the stack // transport dispatcher. Received packets that match the provided transport // protocol will be delivered to the given endpoint.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L972-L986
train
google/netstack
tcpip/stack/stack.go
UnregisterRawTransportEndpoint
func (s *Stack) UnregisterRawTransportEndpoint(nicID tcpip.NICID, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, ep RawTransportEndpoint) { if nicID == 0 { s.demux.unregisterRawEndpoint(netProto, transProto, ep) return } s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic != nil { nic.demux.unregisterRawEndpoint(netProto, transProto, ep) } }
go
func (s *Stack) UnregisterRawTransportEndpoint(nicID tcpip.NICID, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, ep RawTransportEndpoint) { if nicID == 0 { s.demux.unregisterRawEndpoint(netProto, transProto, ep) return } s.mu.RLock() defer s.mu.RUnlock() nic := s.nics[nicID] if nic != nil { nic.demux.unregisterRawEndpoint(netProto, transProto, ep) } }
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// UnregisterRawTransportEndpoint removes the endpoint for the transport // protocol from the stack transport dispatcher.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L990-L1003
train
google/netstack
tcpip/stack/stack.go
NetworkProtocolInstance
func (s *Stack) NetworkProtocolInstance(num tcpip.NetworkProtocolNumber) NetworkProtocol { if p, ok := s.networkProtocols[num]; ok { return p } return nil }
go
func (s *Stack) NetworkProtocolInstance(num tcpip.NetworkProtocolNumber) NetworkProtocol { if p, ok := s.networkProtocols[num]; ok { return p } return nil }
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// NetworkProtocolInstance returns the protocol instance in the stack for the // specified network protocol. This method is public for protocol implementers // and tests to use.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L1008-L1013
train
google/netstack
tcpip/stack/stack.go
TransportProtocolInstance
func (s *Stack) TransportProtocolInstance(num tcpip.TransportProtocolNumber) TransportProtocol { if pState, ok := s.transportProtocols[num]; ok { return pState.proto } return nil }
go
func (s *Stack) TransportProtocolInstance(num tcpip.TransportProtocolNumber) TransportProtocol { if pState, ok := s.transportProtocols[num]; ok { return pState.proto } return nil }
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// TransportProtocolInstance returns the protocol instance in the stack for the // specified transport protocol. This method is public for protocol implementers // and tests to use.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L1018-L1023
train
google/netstack
tcpip/stack/stack.go
GetTCPProbe
func (s *Stack) GetTCPProbe() TCPProbeFunc { s.mu.Lock() p := s.tcpProbeFunc s.mu.Unlock() return p }
go
func (s *Stack) GetTCPProbe() TCPProbeFunc { s.mu.Lock() p := s.tcpProbeFunc s.mu.Unlock() return p }
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// GetTCPProbe returns the TCPProbeFunc if installed with AddTCPProbe, nil // otherwise.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L1044-L1049
train
google/netstack
tcpip/stack/stack.go
JoinGroup
func (s *Stack) JoinGroup(protocol tcpip.NetworkProtocolNumber, nicID tcpip.NICID, multicastAddr tcpip.Address) *tcpip.Error { // TODO: notify network of subscription via igmp protocol. return s.AddAddressWithOptions(nicID, protocol, multicastAddr, NeverPrimaryEndpoint) }
go
func (s *Stack) JoinGroup(protocol tcpip.NetworkProtocolNumber, nicID tcpip.NICID, multicastAddr tcpip.Address) *tcpip.Error { // TODO: notify network of subscription via igmp protocol. return s.AddAddressWithOptions(nicID, protocol, multicastAddr, NeverPrimaryEndpoint) }
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// JoinGroup joins the given multicast group on the given NIC.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L1063-L1066
train
google/netstack
tcpip/stack/stack.go
LeaveGroup
func (s *Stack) LeaveGroup(protocol tcpip.NetworkProtocolNumber, nicID tcpip.NICID, multicastAddr tcpip.Address) *tcpip.Error { return s.RemoveAddress(nicID, multicastAddr) }
go
func (s *Stack) LeaveGroup(protocol tcpip.NetworkProtocolNumber, nicID tcpip.NICID, multicastAddr tcpip.Address) *tcpip.Error { return s.RemoveAddress(nicID, multicastAddr) }
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// LeaveGroup leaves the given multicast group on the given NIC.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/stack.go#L1069-L1071
train
google/netstack
tcpip/transport/udp/forwarder.go
NewForwarder
func NewForwarder(s *stack.Stack, handler func(*ForwarderRequest)) *Forwarder { return &Forwarder{ stack: s, handler: handler, } }
go
func NewForwarder(s *stack.Stack, handler func(*ForwarderRequest)) *Forwarder { return &Forwarder{ stack: s, handler: handler, } }
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// NewForwarder allocates and initializes a new forwarder.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/transport/udp/forwarder.go#L36-L41
train
google/netstack
tcpip/transport/udp/forwarder.go
HandlePacket
func (f *Forwarder) HandlePacket(r *stack.Route, id stack.TransportEndpointID, netHeader buffer.View, vv buffer.VectorisedView) bool { f.handler(&ForwarderRequest{ stack: f.stack, route: r, id: id, vv: vv, }) return true }
go
func (f *Forwarder) HandlePacket(r *stack.Route, id stack.TransportEndpointID, netHeader buffer.View, vv buffer.VectorisedView) bool { f.handler(&ForwarderRequest{ stack: f.stack, route: r, id: id, vv: vv, }) return true }
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// HandlePacket handles all packets. // // This function is expected to be passed as an argument to the // stack.SetTransportProtocolHandler function.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/transport/udp/forwarder.go#L47-L56
train
google/netstack
tcpip/transport/udp/forwarder.go
CreateEndpoint
func (r *ForwarderRequest) CreateEndpoint(queue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) { ep := newEndpoint(r.stack, r.route.NetProto, queue) if err := r.stack.RegisterTransportEndpoint(r.route.NICID(), []tcpip.NetworkProtocolNumber{r.route.NetProto}, ProtocolNumber, r.id, ep, ep.reusePort); err != nil { ep.Close() return nil, err } ep.id = r.id ep.route = r.route.Clone() ep.dstPort = r.id.RemotePort ep.regNICID = r.route.NICID() ep.state = stateConnected ep.rcvMu.Lock() ep.rcvReady = true ep.rcvMu.Unlock() ep.HandlePacket(r.route, r.id, r.vv) return ep, nil }
go
func (r *ForwarderRequest) CreateEndpoint(queue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) { ep := newEndpoint(r.stack, r.route.NetProto, queue) if err := r.stack.RegisterTransportEndpoint(r.route.NICID(), []tcpip.NetworkProtocolNumber{r.route.NetProto}, ProtocolNumber, r.id, ep, ep.reusePort); err != nil { ep.Close() return nil, err } ep.id = r.id ep.route = r.route.Clone() ep.dstPort = r.id.RemotePort ep.regNICID = r.route.NICID() ep.state = stateConnected ep.rcvMu.Lock() ep.rcvReady = true ep.rcvMu.Unlock() ep.HandlePacket(r.route, r.id, r.vv) return ep, nil }
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// CreateEndpoint creates a connected UDP endpoint for the session request.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/transport/udp/forwarder.go#L75-L96
train
google/netstack
tcpip/network/fragmentation/reassembler_list.go
PushBack
func (l *reassemblerList) PushBack(e *reassembler) { reassemblerElementMapper{}.linkerFor(e).SetNext(nil) reassemblerElementMapper{}.linkerFor(e).SetPrev(l.tail) if l.tail != nil { reassemblerElementMapper{}.linkerFor(l.tail).SetNext(e) } else { l.head = e } l.tail = e }
go
func (l *reassemblerList) PushBack(e *reassembler) { reassemblerElementMapper{}.linkerFor(e).SetNext(nil) reassemblerElementMapper{}.linkerFor(e).SetPrev(l.tail) if l.tail != nil { reassemblerElementMapper{}.linkerFor(l.tail).SetNext(e) } else { l.head = e } l.tail = e }
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// PushBack inserts the element e at the back of list l.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/network/fragmentation/reassembler_list.go#L70-L81
train
google/netstack
tcpip/stack/linkaddrcache.go
add
func (c *linkAddrCache) add(k tcpip.FullAddress, v tcpip.LinkAddress) { c.mu.Lock() defer c.mu.Unlock() entry, ok := c.cache[k] if ok { s := entry.state() if s != expired && entry.linkAddr == v { // Disregard repeated calls. return } // Check if entry is waiting for address resolution. if s == incomplete { entry.linkAddr = v } else { // Otherwise create a new entry to replace it. entry = c.makeAndAddEntry(k, v) } } else { entry = c.makeAndAddEntry(k, v) } entry.changeState(ready) }
go
func (c *linkAddrCache) add(k tcpip.FullAddress, v tcpip.LinkAddress) { c.mu.Lock() defer c.mu.Unlock() entry, ok := c.cache[k] if ok { s := entry.state() if s != expired && entry.linkAddr == v { // Disregard repeated calls. return } // Check if entry is waiting for address resolution. if s == incomplete { entry.linkAddr = v } else { // Otherwise create a new entry to replace it. entry = c.makeAndAddEntry(k, v) } } else { entry = c.makeAndAddEntry(k, v) } entry.changeState(ready) }
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// add adds a k -> v mapping to the cache.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/linkaddrcache.go#L150-L173
train
google/netstack
tcpip/stack/linkaddrcache.go
makeAndAddEntry
func (c *linkAddrCache) makeAndAddEntry(k tcpip.FullAddress, v tcpip.LinkAddress) *linkAddrEntry { // Take over the next entry. entry := &c.entries[c.next] if c.cache[entry.addr] == entry { delete(c.cache, entry.addr) } // Mark the soon-to-be-replaced entry as expired, just in case there is // someone waiting for address resolution on it. entry.changeState(expired) *entry = linkAddrEntry{ addr: k, linkAddr: v, expiration: time.Now().Add(c.ageLimit), wakers: make(map[*sleep.Waker]struct{}), done: make(chan struct{}), } c.cache[k] = entry c.next = (c.next + 1) % len(c.entries) return entry }
go
func (c *linkAddrCache) makeAndAddEntry(k tcpip.FullAddress, v tcpip.LinkAddress) *linkAddrEntry { // Take over the next entry. entry := &c.entries[c.next] if c.cache[entry.addr] == entry { delete(c.cache, entry.addr) } // Mark the soon-to-be-replaced entry as expired, just in case there is // someone waiting for address resolution on it. entry.changeState(expired) *entry = linkAddrEntry{ addr: k, linkAddr: v, expiration: time.Now().Add(c.ageLimit), wakers: make(map[*sleep.Waker]struct{}), done: make(chan struct{}), } c.cache[k] = entry c.next = (c.next + 1) % len(c.entries) return entry }
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// makeAndAddEntry is a helper function to create and add a new // entry to the cache map and evict older entry as needed.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/linkaddrcache.go#L177-L199
train
google/netstack
tcpip/stack/linkaddrcache.go
get
func (c *linkAddrCache) get(k tcpip.FullAddress, linkRes LinkAddressResolver, localAddr tcpip.Address, linkEP LinkEndpoint, waker *sleep.Waker) (tcpip.LinkAddress, <-chan struct{}, *tcpip.Error) { if linkRes != nil { if addr, ok := linkRes.ResolveStaticAddress(k.Addr); ok { return addr, nil, nil } } c.mu.Lock() defer c.mu.Unlock() if entry, ok := c.cache[k]; ok { switch s := entry.state(); s { case expired: case ready: return entry.linkAddr, nil, nil case failed: return "", nil, tcpip.ErrNoLinkAddress case incomplete: // Address resolution is still in progress. entry.addWaker(waker) return "", entry.done, tcpip.ErrWouldBlock default: panic(fmt.Sprintf("invalid cache entry state: %s", s)) } } if linkRes == nil { return "", nil, tcpip.ErrNoLinkAddress } // Add 'incomplete' entry in the cache to mark that resolution is in progress. e := c.makeAndAddEntry(k, "") e.addWaker(waker) go c.startAddressResolution(k, linkRes, localAddr, linkEP, e.done) return "", e.done, tcpip.ErrWouldBlock }
go
func (c *linkAddrCache) get(k tcpip.FullAddress, linkRes LinkAddressResolver, localAddr tcpip.Address, linkEP LinkEndpoint, waker *sleep.Waker) (tcpip.LinkAddress, <-chan struct{}, *tcpip.Error) { if linkRes != nil { if addr, ok := linkRes.ResolveStaticAddress(k.Addr); ok { return addr, nil, nil } } c.mu.Lock() defer c.mu.Unlock() if entry, ok := c.cache[k]; ok { switch s := entry.state(); s { case expired: case ready: return entry.linkAddr, nil, nil case failed: return "", nil, tcpip.ErrNoLinkAddress case incomplete: // Address resolution is still in progress. entry.addWaker(waker) return "", entry.done, tcpip.ErrWouldBlock default: panic(fmt.Sprintf("invalid cache entry state: %s", s)) } } if linkRes == nil { return "", nil, tcpip.ErrNoLinkAddress } // Add 'incomplete' entry in the cache to mark that resolution is in progress. e := c.makeAndAddEntry(k, "") e.addWaker(waker) go c.startAddressResolution(k, linkRes, localAddr, linkEP, e.done) return "", e.done, tcpip.ErrWouldBlock }
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// get reports any known link address for k.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/linkaddrcache.go#L202-L238
train
google/netstack
tcpip/link/channel/channel.go
New
func New(size int, mtu uint32, linkAddr tcpip.LinkAddress) (tcpip.LinkEndpointID, *Endpoint) { e := &Endpoint{ C: make(chan PacketInfo, size), mtu: mtu, linkAddr: linkAddr, } return stack.RegisterLinkEndpoint(e), e }
go
func New(size int, mtu uint32, linkAddr tcpip.LinkAddress) (tcpip.LinkEndpointID, *Endpoint) { e := &Endpoint{ C: make(chan PacketInfo, size), mtu: mtu, linkAddr: linkAddr, } return stack.RegisterLinkEndpoint(e), e }
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// New creates a new channel endpoint.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/link/channel/channel.go#L47-L55
train
google/netstack
tcpip/link/channel/channel.go
InjectLinkAddr
func (e *Endpoint) InjectLinkAddr(protocol tcpip.NetworkProtocolNumber, remote tcpip.LinkAddress, vv buffer.VectorisedView) { e.dispatcher.DeliverNetworkPacket(e, remote, "" /* local */, protocol, vv.Clone(nil)) }
go
func (e *Endpoint) InjectLinkAddr(protocol tcpip.NetworkProtocolNumber, remote tcpip.LinkAddress, vv buffer.VectorisedView) { e.dispatcher.DeliverNetworkPacket(e, remote, "" /* local */, protocol, vv.Clone(nil)) }
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// InjectLinkAddr injects an inbound packet with a remote link address.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/link/channel/channel.go#L76-L78
train
google/netstack
tcpip/link/channel/channel.go
Capabilities
func (e *Endpoint) Capabilities() stack.LinkEndpointCapabilities { caps := stack.LinkEndpointCapabilities(0) if e.GSO { caps |= stack.CapabilityGSO } return caps }
go
func (e *Endpoint) Capabilities() stack.LinkEndpointCapabilities { caps := stack.LinkEndpointCapabilities(0) if e.GSO { caps |= stack.CapabilityGSO } return caps }
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// Capabilities implements stack.LinkEndpoint.Capabilities.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/link/channel/channel.go#L98-L104
train
google/netstack
tcpip/link/channel/channel.go
WritePacket
func (e *Endpoint) WritePacket(_ *stack.Route, gso *stack.GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) *tcpip.Error { p := PacketInfo{ Header: hdr.View(), Proto: protocol, Payload: payload.ToView(), GSO: gso, } select { case e.C <- p: default: } return nil }
go
func (e *Endpoint) WritePacket(_ *stack.Route, gso *stack.GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) *tcpip.Error { p := PacketInfo{ Header: hdr.View(), Proto: protocol, Payload: payload.ToView(), GSO: gso, } select { case e.C <- p: default: } return nil }
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// WritePacket stores outbound packets into the channel.
[ "WritePacket", "stores", "outbound", "packets", "into", "the", "channel", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/link/channel/channel.go#L123-L137
train
google/netstack
tcpip/adapters/gonet/gonet.go
Shutdown
func (l *Listener) Shutdown() { l.ep.Shutdown(tcpip.ShutdownWrite | tcpip.ShutdownRead) close(l.cancel) // broadcast cancellation }
go
func (l *Listener) Shutdown() { l.ep.Shutdown(tcpip.ShutdownWrite | tcpip.ShutdownRead) close(l.cancel) // broadcast cancellation }
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// Shutdown stops the HTTP server.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L98-L101
train
google/netstack
tcpip/adapters/gonet/gonet.go
Addr
func (l *Listener) Addr() net.Addr { a, err := l.ep.GetLocalAddress() if err != nil { return nil } return fullToTCPAddr(a) }
go
func (l *Listener) Addr() net.Addr { a, err := l.ep.GetLocalAddress() if err != nil { return nil } return fullToTCPAddr(a) }
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// Addr implements net.Listener.Addr.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L104-L110
train
google/netstack
tcpip/adapters/gonet/gonet.go
setDeadline
func (d *deadlineTimer) setDeadline(cancelCh *chan struct{}, timer **time.Timer, t time.Time) { if *timer != nil && !(*timer).Stop() { *cancelCh = make(chan struct{}) } // Create a new channel if we already closed it due to setting an already // expired time. We won't race with the timer because we already handled // that above. select { case <-*cancelCh: *cancelCh = make(chan struct{}) default: } // "A zero value for t means I/O operations will not time out." // - net.Conn.SetDeadline if t.IsZero() { return } timeout := t.Sub(time.Now()) if timeout <= 0 { close(*cancelCh) return } // Timer.Stop returns whether or not the AfterFunc has started, but // does not indicate whether or not it has completed. Make a copy of // the cancel channel to prevent this code from racing with the next // call of setDeadline replacing *cancelCh. ch := *cancelCh *timer = time.AfterFunc(timeout, func() { close(ch) }) }
go
func (d *deadlineTimer) setDeadline(cancelCh *chan struct{}, timer **time.Timer, t time.Time) { if *timer != nil && !(*timer).Stop() { *cancelCh = make(chan struct{}) } // Create a new channel if we already closed it due to setting an already // expired time. We won't race with the timer because we already handled // that above. select { case <-*cancelCh: *cancelCh = make(chan struct{}) default: } // "A zero value for t means I/O operations will not time out." // - net.Conn.SetDeadline if t.IsZero() { return } timeout := t.Sub(time.Now()) if timeout <= 0 { close(*cancelCh) return } // Timer.Stop returns whether or not the AfterFunc has started, but // does not indicate whether or not it has completed. Make a copy of // the cancel channel to prevent this code from racing with the next // call of setDeadline replacing *cancelCh. ch := *cancelCh *timer = time.AfterFunc(timeout, func() { close(ch) }) }
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// setDeadline contains the shared logic for setting a deadline. // // cancelCh and timer must be pointers to deadlineTimer.readCancelCh and // deadlineTimer.readTimer or deadlineTimer.writeCancelCh and // deadlineTimer.writeTimer. // // setDeadline must only be called while holding d.mu.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L147-L181
train
google/netstack
tcpip/adapters/gonet/gonet.go
SetReadDeadline
func (d *deadlineTimer) SetReadDeadline(t time.Time) error { d.mu.Lock() d.setDeadline(&d.readCancelCh, &d.readTimer, t) d.mu.Unlock() return nil }
go
func (d *deadlineTimer) SetReadDeadline(t time.Time) error { d.mu.Lock() d.setDeadline(&d.readCancelCh, &d.readTimer, t) d.mu.Unlock() return nil }
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// SetReadDeadline implements net.Conn.SetReadDeadline and // net.PacketConn.SetReadDeadline.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L185-L190
train
google/netstack
tcpip/adapters/gonet/gonet.go
SetWriteDeadline
func (d *deadlineTimer) SetWriteDeadline(t time.Time) error { d.mu.Lock() d.setDeadline(&d.writeCancelCh, &d.writeTimer, t) d.mu.Unlock() return nil }
go
func (d *deadlineTimer) SetWriteDeadline(t time.Time) error { d.mu.Lock() d.setDeadline(&d.writeCancelCh, &d.writeTimer, t) d.mu.Unlock() return nil }
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// SetWriteDeadline implements net.Conn.SetWriteDeadline and // net.PacketConn.SetWriteDeadline.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L194-L199
train
google/netstack
tcpip/adapters/gonet/gonet.go
SetDeadline
func (d *deadlineTimer) SetDeadline(t time.Time) error { d.mu.Lock() d.setDeadline(&d.readCancelCh, &d.readTimer, t) d.setDeadline(&d.writeCancelCh, &d.writeTimer, t) d.mu.Unlock() return nil }
go
func (d *deadlineTimer) SetDeadline(t time.Time) error { d.mu.Lock() d.setDeadline(&d.readCancelCh, &d.readTimer, t) d.setDeadline(&d.writeCancelCh, &d.writeTimer, t) d.mu.Unlock() return nil }
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// SetDeadline implements net.Conn.SetDeadline and net.PacketConn.SetDeadline.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L202-L208
train
google/netstack
tcpip/adapters/gonet/gonet.go
NewConn
func NewConn(wq *waiter.Queue, ep tcpip.Endpoint) *Conn { c := &Conn{ wq: wq, ep: ep, } c.deadlineTimer.init() return c }
go
func NewConn(wq *waiter.Queue, ep tcpip.Endpoint) *Conn { c := &Conn{ wq: wq, ep: ep, } c.deadlineTimer.init() return c }
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// NewConn creates a new Conn.
[ "NewConn", "creates", "a", "new", "Conn", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L231-L238
train
google/netstack
tcpip/adapters/gonet/gonet.go
Accept
func (l *Listener) Accept() (net.Conn, error) { n, wq, err := l.ep.Accept() if err == tcpip.ErrWouldBlock { // Create wait queue entry that notifies a channel. waitEntry, notifyCh := waiter.NewChannelEntry(nil) l.wq.EventRegister(&waitEntry, waiter.EventIn) defer l.wq.EventUnregister(&waitEntry) for { n, wq, err = l.ep.Accept() if err != tcpip.ErrWouldBlock { break } select { case <-l.cancel: return nil, errCanceled case <-notifyCh: } } } if err != nil { return nil, &net.OpError{ Op: "accept", Net: "tcp", Addr: l.Addr(), Err: errors.New(err.String()), } } return NewConn(wq, n), nil }
go
func (l *Listener) Accept() (net.Conn, error) { n, wq, err := l.ep.Accept() if err == tcpip.ErrWouldBlock { // Create wait queue entry that notifies a channel. waitEntry, notifyCh := waiter.NewChannelEntry(nil) l.wq.EventRegister(&waitEntry, waiter.EventIn) defer l.wq.EventUnregister(&waitEntry) for { n, wq, err = l.ep.Accept() if err != tcpip.ErrWouldBlock { break } select { case <-l.cancel: return nil, errCanceled case <-notifyCh: } } } if err != nil { return nil, &net.OpError{ Op: "accept", Net: "tcp", Addr: l.Addr(), Err: errors.New(err.String()), } } return NewConn(wq, n), nil }
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// Accept implements net.Conn.Accept.
[ "Accept", "implements", "net", ".", "Conn", ".", "Accept", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L241-L275
train
google/netstack
tcpip/adapters/gonet/gonet.go
commonRead
func commonRead(ep tcpip.Endpoint, wq *waiter.Queue, deadline <-chan struct{}, addr *tcpip.FullAddress, errorer opErrorer, dontWait bool) ([]byte, error) { select { case <-deadline: return nil, errorer.newOpError("read", &timeoutError{}) default: } read, _, err := ep.Read(addr) if err == tcpip.ErrWouldBlock { if dontWait { return nil, errWouldBlock } // Create wait queue entry that notifies a channel. waitEntry, notifyCh := waiter.NewChannelEntry(nil) wq.EventRegister(&waitEntry, waiter.EventIn) defer wq.EventUnregister(&waitEntry) for { read, _, err = ep.Read(addr) if err != tcpip.ErrWouldBlock { break } select { case <-deadline: return nil, errorer.newOpError("read", &timeoutError{}) case <-notifyCh: } } } if err == tcpip.ErrClosedForReceive { return nil, io.EOF } if err != nil { return nil, errorer.newOpError("read", errors.New(err.String())) } return read, nil }
go
func commonRead(ep tcpip.Endpoint, wq *waiter.Queue, deadline <-chan struct{}, addr *tcpip.FullAddress, errorer opErrorer, dontWait bool) ([]byte, error) { select { case <-deadline: return nil, errorer.newOpError("read", &timeoutError{}) default: } read, _, err := ep.Read(addr) if err == tcpip.ErrWouldBlock { if dontWait { return nil, errWouldBlock } // Create wait queue entry that notifies a channel. waitEntry, notifyCh := waiter.NewChannelEntry(nil) wq.EventRegister(&waitEntry, waiter.EventIn) defer wq.EventUnregister(&waitEntry) for { read, _, err = ep.Read(addr) if err != tcpip.ErrWouldBlock { break } select { case <-deadline: return nil, errorer.newOpError("read", &timeoutError{}) case <-notifyCh: } } } if err == tcpip.ErrClosedForReceive { return nil, io.EOF } if err != nil { return nil, errorer.newOpError("read", errors.New(err.String())) } return read, nil }
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// commonRead implements the common logic between net.Conn.Read and // net.PacketConn.ReadFrom.
[ "commonRead", "implements", "the", "common", "logic", "between", "net", ".", "Conn", ".", "Read", "and", "net", ".", "PacketConn", ".", "ReadFrom", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L283-L322
train
google/netstack
tcpip/adapters/gonet/gonet.go
Read
func (c *Conn) Read(b []byte) (int, error) { c.readMu.Lock() defer c.readMu.Unlock() deadline := c.readCancel() numRead := 0 for numRead != len(b) { if len(c.read) == 0 { var err error c.read, err = commonRead(c.ep, c.wq, deadline, nil, c, numRead != 0) if err != nil { if numRead != 0 { return numRead, nil } return numRead, err } } n := copy(b[numRead:], c.read) c.read.TrimFront(n) numRead += n if len(c.read) == 0 { c.read = nil } } return numRead, nil }
go
func (c *Conn) Read(b []byte) (int, error) { c.readMu.Lock() defer c.readMu.Unlock() deadline := c.readCancel() numRead := 0 for numRead != len(b) { if len(c.read) == 0 { var err error c.read, err = commonRead(c.ep, c.wq, deadline, nil, c, numRead != 0) if err != nil { if numRead != 0 { return numRead, nil } return numRead, err } } n := copy(b[numRead:], c.read) c.read.TrimFront(n) numRead += n if len(c.read) == 0 { c.read = nil } } return numRead, nil }
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// Read implements net.Conn.Read.
[ "Read", "implements", "net", ".", "Conn", ".", "Read", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L325-L351
train
google/netstack
tcpip/adapters/gonet/gonet.go
Write
func (c *Conn) Write(b []byte) (int, error) { deadline := c.writeCancel() // Check if deadlineTimer has already expired. select { case <-deadline: return 0, c.newOpError("write", &timeoutError{}) default: } v := buffer.NewViewFromBytes(b) // We must handle two soft failure conditions simultaneously: // 1. Write may write nothing and return tcpip.ErrWouldBlock. // If this happens, we need to register for notifications if we have // not already and wait to try again. // 2. Write may write fewer than the full number of bytes and return // without error. In this case we need to try writing the remaining // bytes again. I do not need to register for notifications. // // What is more, these two soft failure conditions can be interspersed. // There is no guarantee that all of the condition #1s will occur before // all of the condition #2s or visa-versa. var ( err *tcpip.Error nbytes int reg bool notifyCh chan struct{} ) for nbytes < len(b) && (err == tcpip.ErrWouldBlock || err == nil) { if err == tcpip.ErrWouldBlock { if !reg { // Only register once. reg = true // Create wait queue entry that notifies a channel. var waitEntry waiter.Entry waitEntry, notifyCh = waiter.NewChannelEntry(nil) c.wq.EventRegister(&waitEntry, waiter.EventOut) defer c.wq.EventUnregister(&waitEntry) } else { // Don't wait immediately after registration in case more data // became available between when we last checked and when we setup // the notification. select { case <-deadline: return nbytes, c.newOpError("write", &timeoutError{}) case <-notifyCh: } } } var n uintptr var resCh <-chan struct{} n, resCh, err = c.ep.Write(tcpip.SlicePayload(v), tcpip.WriteOptions{}) nbytes += int(n) v.TrimFront(int(n)) if resCh != nil { select { case <-deadline: return nbytes, c.newOpError("write", &timeoutError{}) case <-resCh: } n, _, err = c.ep.Write(tcpip.SlicePayload(v), tcpip.WriteOptions{}) nbytes += int(n) v.TrimFront(int(n)) } } if err == nil { return nbytes, nil } return nbytes, c.newOpError("write", errors.New(err.String())) }
go
func (c *Conn) Write(b []byte) (int, error) { deadline := c.writeCancel() // Check if deadlineTimer has already expired. select { case <-deadline: return 0, c.newOpError("write", &timeoutError{}) default: } v := buffer.NewViewFromBytes(b) // We must handle two soft failure conditions simultaneously: // 1. Write may write nothing and return tcpip.ErrWouldBlock. // If this happens, we need to register for notifications if we have // not already and wait to try again. // 2. Write may write fewer than the full number of bytes and return // without error. In this case we need to try writing the remaining // bytes again. I do not need to register for notifications. // // What is more, these two soft failure conditions can be interspersed. // There is no guarantee that all of the condition #1s will occur before // all of the condition #2s or visa-versa. var ( err *tcpip.Error nbytes int reg bool notifyCh chan struct{} ) for nbytes < len(b) && (err == tcpip.ErrWouldBlock || err == nil) { if err == tcpip.ErrWouldBlock { if !reg { // Only register once. reg = true // Create wait queue entry that notifies a channel. var waitEntry waiter.Entry waitEntry, notifyCh = waiter.NewChannelEntry(nil) c.wq.EventRegister(&waitEntry, waiter.EventOut) defer c.wq.EventUnregister(&waitEntry) } else { // Don't wait immediately after registration in case more data // became available between when we last checked and when we setup // the notification. select { case <-deadline: return nbytes, c.newOpError("write", &timeoutError{}) case <-notifyCh: } } } var n uintptr var resCh <-chan struct{} n, resCh, err = c.ep.Write(tcpip.SlicePayload(v), tcpip.WriteOptions{}) nbytes += int(n) v.TrimFront(int(n)) if resCh != nil { select { case <-deadline: return nbytes, c.newOpError("write", &timeoutError{}) case <-resCh: } n, _, err = c.ep.Write(tcpip.SlicePayload(v), tcpip.WriteOptions{}) nbytes += int(n) v.TrimFront(int(n)) } } if err == nil { return nbytes, nil } return nbytes, c.newOpError("write", errors.New(err.String())) }
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// Write implements net.Conn.Write.
[ "Write", "implements", "net", ".", "Conn", ".", "Write", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L354-L430
train
google/netstack
tcpip/adapters/gonet/gonet.go
LocalAddr
func (c *Conn) LocalAddr() net.Addr { a, err := c.ep.GetLocalAddress() if err != nil { return nil } return fullToTCPAddr(a) }
go
func (c *Conn) LocalAddr() net.Addr { a, err := c.ep.GetLocalAddress() if err != nil { return nil } return fullToTCPAddr(a) }
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// LocalAddr implements net.Conn.LocalAddr.
[ "LocalAddr", "implements", "net", ".", "Conn", ".", "LocalAddr", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L461-L467
train
google/netstack
tcpip/adapters/gonet/gonet.go
DialTCP
func DialTCP(s *stack.Stack, addr tcpip.FullAddress, network tcpip.NetworkProtocolNumber) (*Conn, error) { // Create TCP endpoint, then connect. var wq waiter.Queue ep, err := s.NewEndpoint(tcp.ProtocolNumber, network, &wq) if err != nil { return nil, errors.New(err.String()) } // Create wait queue entry that notifies a channel. // // We do this unconditionally as Connect will always return an error. waitEntry, notifyCh := waiter.NewChannelEntry(nil) wq.EventRegister(&waitEntry, waiter.EventOut) defer wq.EventUnregister(&waitEntry) err = ep.Connect(addr) if err == tcpip.ErrConnectStarted { <-notifyCh err = ep.GetSockOpt(tcpip.ErrorOption{}) } if err != nil { ep.Close() return nil, &net.OpError{ Op: "connect", Net: "tcp", Addr: fullToTCPAddr(addr), Err: errors.New(err.String()), } } return NewConn(&wq, ep), nil }
go
func DialTCP(s *stack.Stack, addr tcpip.FullAddress, network tcpip.NetworkProtocolNumber) (*Conn, error) { // Create TCP endpoint, then connect. var wq waiter.Queue ep, err := s.NewEndpoint(tcp.ProtocolNumber, network, &wq) if err != nil { return nil, errors.New(err.String()) } // Create wait queue entry that notifies a channel. // // We do this unconditionally as Connect will always return an error. waitEntry, notifyCh := waiter.NewChannelEntry(nil) wq.EventRegister(&waitEntry, waiter.EventOut) defer wq.EventUnregister(&waitEntry) err = ep.Connect(addr) if err == tcpip.ErrConnectStarted { <-notifyCh err = ep.GetSockOpt(tcpip.ErrorOption{}) } if err != nil { ep.Close() return nil, &net.OpError{ Op: "connect", Net: "tcp", Addr: fullToTCPAddr(addr), Err: errors.New(err.String()), } } return NewConn(&wq, ep), nil }
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// DialTCP creates a new TCP Conn connected to the specified address.
[ "DialTCP", "creates", "a", "new", "TCP", "Conn", "connected", "to", "the", "specified", "address", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L497-L528
train
google/netstack
tcpip/adapters/gonet/gonet.go
NewPacketConn
func NewPacketConn(s *stack.Stack, addr tcpip.FullAddress, network tcpip.NetworkProtocolNumber) (*PacketConn, error) { // Create UDP endpoint and bind it. var wq waiter.Queue ep, err := s.NewEndpoint(udp.ProtocolNumber, network, &wq) if err != nil { return nil, errors.New(err.String()) } if err := ep.Bind(addr); err != nil { ep.Close() return nil, &net.OpError{ Op: "bind", Net: "udp", Addr: fullToUDPAddr(addr), Err: errors.New(err.String()), } } c := &PacketConn{ stack: s, ep: ep, wq: &wq, } c.deadlineTimer.init() return c, nil }
go
func NewPacketConn(s *stack.Stack, addr tcpip.FullAddress, network tcpip.NetworkProtocolNumber) (*PacketConn, error) { // Create UDP endpoint and bind it. var wq waiter.Queue ep, err := s.NewEndpoint(udp.ProtocolNumber, network, &wq) if err != nil { return nil, errors.New(err.String()) } if err := ep.Bind(addr); err != nil { ep.Close() return nil, &net.OpError{ Op: "bind", Net: "udp", Addr: fullToUDPAddr(addr), Err: errors.New(err.String()), } } c := &PacketConn{ stack: s, ep: ep, wq: &wq, } c.deadlineTimer.init() return c, nil }
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// NewPacketConn creates a new PacketConn.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L541-L566
train
google/netstack
tcpip/adapters/gonet/gonet.go
RemoteAddr
func (c *PacketConn) RemoteAddr() net.Addr { a, err := c.ep.GetRemoteAddress() if err != nil { return nil } return fullToTCPAddr(a) }
go
func (c *PacketConn) RemoteAddr() net.Addr { a, err := c.ep.GetRemoteAddress() if err != nil { return nil } return fullToTCPAddr(a) }
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// RemoteAddr implements net.Conn.RemoteAddr.
[ "RemoteAddr", "implements", "net", ".", "Conn", ".", "RemoteAddr", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L583-L589
train
google/netstack
tcpip/adapters/gonet/gonet.go
Read
func (c *PacketConn) Read(b []byte) (int, error) { bytesRead, _, err := c.ReadFrom(b) return bytesRead, err }
go
func (c *PacketConn) Read(b []byte) (int, error) { bytesRead, _, err := c.ReadFrom(b) return bytesRead, err }
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// Read implements net.Conn.Read
[ "Read", "implements", "net", ".", "Conn", ".", "Read" ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L592-L595
train
google/netstack
tcpip/adapters/gonet/gonet.go
ReadFrom
func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) { deadline := c.readCancel() var addr tcpip.FullAddress read, err := commonRead(c.ep, c.wq, deadline, &addr, c, false) if err != nil { return 0, nil, err } return copy(b, read), fullToUDPAddr(addr), nil }
go
func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) { deadline := c.readCancel() var addr tcpip.FullAddress read, err := commonRead(c.ep, c.wq, deadline, &addr, c, false) if err != nil { return 0, nil, err } return copy(b, read), fullToUDPAddr(addr), nil }
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// ReadFrom implements net.PacketConn.ReadFrom.
[ "ReadFrom", "implements", "net", ".", "PacketConn", ".", "ReadFrom", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L598-L608
train
google/netstack
tcpip/adapters/gonet/gonet.go
WriteTo
func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) { deadline := c.writeCancel() // Check if deadline has already expired. select { case <-deadline: return 0, c.newRemoteOpError("write", addr, &timeoutError{}) default: } // If we're being called by Write, there is no addr wopts := tcpip.WriteOptions{} if addr != nil { ua := addr.(*net.UDPAddr) wopts.To = &tcpip.FullAddress{Addr: tcpip.Address(ua.IP), Port: uint16(ua.Port)} } v := buffer.NewView(len(b)) copy(v, b) n, resCh, err := c.ep.Write(tcpip.SlicePayload(v), wopts) if resCh != nil { select { case <-deadline: return int(n), c.newRemoteOpError("write", addr, &timeoutError{}) case <-resCh: } n, _, err = c.ep.Write(tcpip.SlicePayload(v), wopts) } if err == tcpip.ErrWouldBlock { // Create wait queue entry that notifies a channel. waitEntry, notifyCh := waiter.NewChannelEntry(nil) c.wq.EventRegister(&waitEntry, waiter.EventOut) defer c.wq.EventUnregister(&waitEntry) for { select { case <-deadline: return int(n), c.newRemoteOpError("write", addr, &timeoutError{}) case <-notifyCh: } n, _, err = c.ep.Write(tcpip.SlicePayload(v), wopts) if err != tcpip.ErrWouldBlock { break } } } if err == nil { return int(n), nil } return int(n), c.newRemoteOpError("write", addr, errors.New(err.String())) }
go
func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) { deadline := c.writeCancel() // Check if deadline has already expired. select { case <-deadline: return 0, c.newRemoteOpError("write", addr, &timeoutError{}) default: } // If we're being called by Write, there is no addr wopts := tcpip.WriteOptions{} if addr != nil { ua := addr.(*net.UDPAddr) wopts.To = &tcpip.FullAddress{Addr: tcpip.Address(ua.IP), Port: uint16(ua.Port)} } v := buffer.NewView(len(b)) copy(v, b) n, resCh, err := c.ep.Write(tcpip.SlicePayload(v), wopts) if resCh != nil { select { case <-deadline: return int(n), c.newRemoteOpError("write", addr, &timeoutError{}) case <-resCh: } n, _, err = c.ep.Write(tcpip.SlicePayload(v), wopts) } if err == tcpip.ErrWouldBlock { // Create wait queue entry that notifies a channel. waitEntry, notifyCh := waiter.NewChannelEntry(nil) c.wq.EventRegister(&waitEntry, waiter.EventOut) defer c.wq.EventUnregister(&waitEntry) for { select { case <-deadline: return int(n), c.newRemoteOpError("write", addr, &timeoutError{}) case <-notifyCh: } n, _, err = c.ep.Write(tcpip.SlicePayload(v), wopts) if err != tcpip.ErrWouldBlock { break } } } if err == nil { return int(n), nil } return int(n), c.newRemoteOpError("write", addr, errors.New(err.String())) }
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// WriteTo implements net.PacketConn.WriteTo.
[ "WriteTo", "implements", "net", ".", "PacketConn", ".", "WriteTo", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L615-L670
train
google/netstack
tcpip/adapters/gonet/gonet.go
LocalAddr
func (c *PacketConn) LocalAddr() net.Addr { a, err := c.ep.GetLocalAddress() if err != nil { return nil } return fullToUDPAddr(a) }
go
func (c *PacketConn) LocalAddr() net.Addr { a, err := c.ep.GetLocalAddress() if err != nil { return nil } return fullToUDPAddr(a) }
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// LocalAddr implements net.PacketConn.LocalAddr.
[ "LocalAddr", "implements", "net", ".", "PacketConn", ".", "LocalAddr", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/adapters/gonet/gonet.go#L679-L685
train
google/netstack
tcpip/buffer/prependable.go
NewPrependable
func NewPrependable(size int) Prependable { return Prependable{buf: NewView(size), usedIdx: size} }
go
func NewPrependable(size int) Prependable { return Prependable{buf: NewView(size), usedIdx: size} }
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// NewPrependable allocates a new prependable buffer with the given size.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/buffer/prependable.go#L31-L33
train
google/netstack
tcpip/buffer/prependable.go
Prepend
func (p *Prependable) Prepend(size int) []byte { if size > p.usedIdx { return nil } p.usedIdx -= size return p.View()[:size:size] }
go
func (p *Prependable) Prepend(size int) []byte { if size > p.usedIdx { return nil } p.usedIdx -= size return p.View()[:size:size] }
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// Prepend reserves the requested space in front of the buffer, returning a // slice that represents the reserved space.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/buffer/prependable.go#L57-L64
train
google/netstack
tcpip/link/tun/tun_unsafe.go
Open
func Open(name string) (int, error) { return open(name, syscall.IFF_TUN|syscall.IFF_NO_PI) }
go
func Open(name string) (int, error) { return open(name, syscall.IFF_TUN|syscall.IFF_NO_PI) }
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// Open opens the specified TUN device, sets it to non-blocking mode, and // returns its file descriptor.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/link/tun/tun_unsafe.go#L27-L29
train
google/netstack
tcpip/link/tun/tun_unsafe.go
OpenTAP
func OpenTAP(name string) (int, error) { return open(name, syscall.IFF_TAP|syscall.IFF_NO_PI) }
go
func OpenTAP(name string) (int, error) { return open(name, syscall.IFF_TAP|syscall.IFF_NO_PI) }
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// OpenTAP opens the specified TAP device, sets it to non-blocking mode, and // returns its file descriptor.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/link/tun/tun_unsafe.go#L33-L35
train
google/netstack
sleep/sleep_unsafe.go
AddWaker
func (s *Sleeper) AddWaker(w *Waker, id int) { // Add the waker to the list of all wakers. w.allWakersNext = s.allWakers s.allWakers = w w.id = id // Try to associate the waker with the sleeper. If it's already // asserted, we simply enqueue it in the "ready" list. for { p := (*Sleeper)(atomic.LoadPointer(&w.s)) if p == &assertedSleeper { s.enqueueAssertedWaker(w) return } if atomic.CompareAndSwapPointer(&w.s, usleeper(p), usleeper(s)) { return } } }
go
func (s *Sleeper) AddWaker(w *Waker, id int) { // Add the waker to the list of all wakers. w.allWakersNext = s.allWakers s.allWakers = w w.id = id // Try to associate the waker with the sleeper. If it's already // asserted, we simply enqueue it in the "ready" list. for { p := (*Sleeper)(atomic.LoadPointer(&w.s)) if p == &assertedSleeper { s.enqueueAssertedWaker(w) return } if atomic.CompareAndSwapPointer(&w.s, usleeper(p), usleeper(s)) { return } } }
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// AddWaker associates the given waker to the sleeper. id is the value to be // returned when the sleeper is woken by the given waker.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/sleep/sleep_unsafe.go#L128-L147
train
google/netstack
sleep/sleep_unsafe.go
nextWaker
func (s *Sleeper) nextWaker(block bool) *Waker { // Attempt to replenish the local list if it's currently empty. if s.localList == nil { for atomic.LoadPointer(&s.sharedList) == nil { // Fail request if caller requested that we // don't block. if !block { return nil } // Indicate to wakers that we're about to sleep, // this allows them to abort the wait by setting // waitingG back to zero (which we'll notice // before committing the sleep). atomic.StoreUintptr(&s.waitingG, preparingG) // Check if something was queued while we were // preparing to sleep. We need this interleaving // to avoid missing wake ups. if atomic.LoadPointer(&s.sharedList) != nil { atomic.StoreUintptr(&s.waitingG, 0) break } // Try to commit the sleep and report it to the // tracer as a select. // // gopark puts the caller to sleep and calls // commitSleep to decide whether to immediately // wake the caller up or to leave it sleeping. const traceEvGoBlockSelect = 24 gopark(commitSleep, &s.waitingG, "sleeper", traceEvGoBlockSelect, 0) } // Pull the shared list out and reverse it in the local // list. Given that wakers push themselves in reverse // order, we fix things here. v := (*Waker)(atomic.SwapPointer(&s.sharedList, nil)) for v != nil { cur := v v = v.next cur.next = s.localList s.localList = cur } } // Remove the waker in the front of the list. w := s.localList s.localList = w.next return w }
go
func (s *Sleeper) nextWaker(block bool) *Waker { // Attempt to replenish the local list if it's currently empty. if s.localList == nil { for atomic.LoadPointer(&s.sharedList) == nil { // Fail request if caller requested that we // don't block. if !block { return nil } // Indicate to wakers that we're about to sleep, // this allows them to abort the wait by setting // waitingG back to zero (which we'll notice // before committing the sleep). atomic.StoreUintptr(&s.waitingG, preparingG) // Check if something was queued while we were // preparing to sleep. We need this interleaving // to avoid missing wake ups. if atomic.LoadPointer(&s.sharedList) != nil { atomic.StoreUintptr(&s.waitingG, 0) break } // Try to commit the sleep and report it to the // tracer as a select. // // gopark puts the caller to sleep and calls // commitSleep to decide whether to immediately // wake the caller up or to leave it sleeping. const traceEvGoBlockSelect = 24 gopark(commitSleep, &s.waitingG, "sleeper", traceEvGoBlockSelect, 0) } // Pull the shared list out and reverse it in the local // list. Given that wakers push themselves in reverse // order, we fix things here. v := (*Waker)(atomic.SwapPointer(&s.sharedList, nil)) for v != nil { cur := v v = v.next cur.next = s.localList s.localList = cur } } // Remove the waker in the front of the list. w := s.localList s.localList = w.next return w }
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// nextWaker returns the next waker in the notification list, blocking if // needed.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/sleep/sleep_unsafe.go#L151-L203
train
google/netstack
sleep/sleep_unsafe.go
enqueueAssertedWaker
func (s *Sleeper) enqueueAssertedWaker(w *Waker) { // Add the new waker to the front of the list. for { v := (*Waker)(atomic.LoadPointer(&s.sharedList)) w.next = v if atomic.CompareAndSwapPointer(&s.sharedList, uwaker(v), uwaker(w)) { break } } for { // Nothing to do if there isn't a G waiting. g := atomic.LoadUintptr(&s.waitingG) if g == 0 { return } // Signal to the sleeper that a waker has been asserted. if atomic.CompareAndSwapUintptr(&s.waitingG, g, 0) { if g != preparingG { // We managed to get a G. Wake it up. goready(g, 0) } } } }
go
func (s *Sleeper) enqueueAssertedWaker(w *Waker) { // Add the new waker to the front of the list. for { v := (*Waker)(atomic.LoadPointer(&s.sharedList)) w.next = v if atomic.CompareAndSwapPointer(&s.sharedList, uwaker(v), uwaker(w)) { break } } for { // Nothing to do if there isn't a G waiting. g := atomic.LoadUintptr(&s.waitingG) if g == 0 { return } // Signal to the sleeper that a waker has been asserted. if atomic.CompareAndSwapUintptr(&s.waitingG, g, 0) { if g != preparingG { // We managed to get a G. Wake it up. goready(g, 0) } } } }
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// enqueueAssertedWaker enqueues an asserted waker to the "ready" circular list // of wakers that want to notify the sleeper.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/sleep/sleep_unsafe.go#L284-L309
train
google/netstack
sleep/sleep_unsafe.go
Assert
func (w *Waker) Assert() { // Nothing to do if the waker is already asserted. This check allows us // to complete this case (already asserted) without any interlocked // operations on x86. if atomic.LoadPointer(&w.s) == usleeper(&assertedSleeper) { return } // Mark the waker as asserted, and wake up a sleeper if there is one. switch s := (*Sleeper)(atomic.SwapPointer(&w.s, usleeper(&assertedSleeper))); s { case nil: case &assertedSleeper: default: s.enqueueAssertedWaker(w) } }
go
func (w *Waker) Assert() { // Nothing to do if the waker is already asserted. This check allows us // to complete this case (already asserted) without any interlocked // operations on x86. if atomic.LoadPointer(&w.s) == usleeper(&assertedSleeper) { return } // Mark the waker as asserted, and wake up a sleeper if there is one. switch s := (*Sleeper)(atomic.SwapPointer(&w.s, usleeper(&assertedSleeper))); s { case nil: case &assertedSleeper: default: s.enqueueAssertedWaker(w) } }
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// Assert moves the waker to an asserted state, if it isn't asserted yet. When // asserted, the waker will cause its matching sleeper to wake up.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/sleep/sleep_unsafe.go#L347-L362
train
google/netstack
tcpip/stack/registration.go
RegisterLinkEndpoint
func RegisterLinkEndpoint(linkEP LinkEndpoint) tcpip.LinkEndpointID { linkEPMu.Lock() defer linkEPMu.Unlock() v := nextLinkEndpointID nextLinkEndpointID++ linkEndpoints[v] = linkEP return v }
go
func RegisterLinkEndpoint(linkEP LinkEndpoint) tcpip.LinkEndpointID { linkEPMu.Lock() defer linkEPMu.Unlock() v := nextLinkEndpointID nextLinkEndpointID++ linkEndpoints[v] = linkEP return v }
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// RegisterLinkEndpoint register a link-layer protocol endpoint and returns an // ID that can be used to refer to it.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/registration.go#L385-L395
train
google/netstack
tcpip/stack/registration.go
FindLinkEndpoint
func FindLinkEndpoint(id tcpip.LinkEndpointID) LinkEndpoint { linkEPMu.RLock() defer linkEPMu.RUnlock() return linkEndpoints[id] }
go
func FindLinkEndpoint(id tcpip.LinkEndpointID) LinkEndpoint { linkEPMu.RLock() defer linkEPMu.RUnlock() return linkEndpoints[id] }
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// FindLinkEndpoint finds the link endpoint associated with the given ID.
[ "FindLinkEndpoint", "finds", "the", "link", "endpoint", "associated", "with", "the", "given", "ID", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/registration.go#L398-L403
train
google/netstack
tcpip/link/sharedmem/rx.go
init
func (r *rx) init(mtu uint32, c *QueueConfig) error { // Map in all buffers. txPipe, err := getBuffer(c.TxPipeFD) if err != nil { return err } rxPipe, err := getBuffer(c.RxPipeFD) if err != nil { syscall.Munmap(txPipe) return err } data, err := getBuffer(c.DataFD) if err != nil { syscall.Munmap(txPipe) syscall.Munmap(rxPipe) return err } sharedData, err := getBuffer(c.SharedDataFD) if err != nil { syscall.Munmap(txPipe) syscall.Munmap(rxPipe) syscall.Munmap(data) return err } // Duplicate the eventFD so that caller can close it but we can still // use it. efd, err := syscall.Dup(c.EventFD) if err != nil { syscall.Munmap(txPipe) syscall.Munmap(rxPipe) syscall.Munmap(data) syscall.Munmap(sharedData) return err } // Set the eventfd as non-blocking. if err := syscall.SetNonblock(efd, true); err != nil { syscall.Munmap(txPipe) syscall.Munmap(rxPipe) syscall.Munmap(data) syscall.Munmap(sharedData) syscall.Close(efd) return err } // Initialize state based on buffers. r.q.Init(txPipe, rxPipe, sharedDataPointer(sharedData)) r.data = data r.eventFD = efd r.sharedData = sharedData return nil }
go
func (r *rx) init(mtu uint32, c *QueueConfig) error { // Map in all buffers. txPipe, err := getBuffer(c.TxPipeFD) if err != nil { return err } rxPipe, err := getBuffer(c.RxPipeFD) if err != nil { syscall.Munmap(txPipe) return err } data, err := getBuffer(c.DataFD) if err != nil { syscall.Munmap(txPipe) syscall.Munmap(rxPipe) return err } sharedData, err := getBuffer(c.SharedDataFD) if err != nil { syscall.Munmap(txPipe) syscall.Munmap(rxPipe) syscall.Munmap(data) return err } // Duplicate the eventFD so that caller can close it but we can still // use it. efd, err := syscall.Dup(c.EventFD) if err != nil { syscall.Munmap(txPipe) syscall.Munmap(rxPipe) syscall.Munmap(data) syscall.Munmap(sharedData) return err } // Set the eventfd as non-blocking. if err := syscall.SetNonblock(efd, true); err != nil { syscall.Munmap(txPipe) syscall.Munmap(rxPipe) syscall.Munmap(data) syscall.Munmap(sharedData) syscall.Close(efd) return err } // Initialize state based on buffers. r.q.Init(txPipe, rxPipe, sharedDataPointer(sharedData)) r.data = data r.eventFD = efd r.sharedData = sharedData return nil }
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// init initializes all state needed by the rx queue based on the information // provided. // // The caller always retains ownership of all file descriptors passed in. The // queue implementation will duplicate any that it may need in the future.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/link/sharedmem/rx.go#L40-L96
train
google/netstack
tcpip/header/tcp.go
Less
func (r SACKBlock) Less(b btree.Item) bool { return r.Start.LessThan(b.(SACKBlock).Start) }
go
func (r SACKBlock) Less(b btree.Item) bool { return r.Start.LessThan(b.(SACKBlock).Start) }
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// Less returns true if r.Start < b.Start.
[ "Less", "returns", "true", "if", "r", ".", "Start", "<", "b", ".", "Start", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L137-L139
train
google/netstack
tcpip/header/tcp.go
Contains
func (r SACKBlock) Contains(b SACKBlock) bool { return r.Start.LessThanEq(b.Start) && b.End.LessThanEq(r.End) }
go
func (r SACKBlock) Contains(b SACKBlock) bool { return r.Start.LessThanEq(b.Start) && b.End.LessThanEq(r.End) }
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// Contains returns true if b is completely contained in r.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L142-L144
train
google/netstack
tcpip/header/tcp.go
SetSourcePort
func (b TCP) SetSourcePort(port uint16) { binary.BigEndian.PutUint16(b[TCPSrcPortOffset:], port) }
go
func (b TCP) SetSourcePort(port uint16) { binary.BigEndian.PutUint16(b[TCPSrcPortOffset:], port) }
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// SetSourcePort sets the "source port" field of the tcp header.
[ "SetSourcePort", "sets", "the", "source", "port", "field", "of", "the", "tcp", "header", "." ]
70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L227-L229
train
google/netstack
tcpip/header/tcp.go
SetDestinationPort
func (b TCP) SetDestinationPort(port uint16) { binary.BigEndian.PutUint16(b[TCPDstPortOffset:], port) }
go
func (b TCP) SetDestinationPort(port uint16) { binary.BigEndian.PutUint16(b[TCPDstPortOffset:], port) }
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// SetDestinationPort sets the "destination port" field of the tcp header.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L232-L234
train
google/netstack
tcpip/header/tcp.go
SetChecksum
func (b TCP) SetChecksum(checksum uint16) { binary.BigEndian.PutUint16(b[TCPChecksumOffset:], checksum) }
go
func (b TCP) SetChecksum(checksum uint16) { binary.BigEndian.PutUint16(b[TCPChecksumOffset:], checksum) }
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// SetChecksum sets the checksum field of the tcp header.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L237-L239
train
google/netstack
tcpip/header/tcp.go
CalculateChecksum
func (b TCP) CalculateChecksum(partialChecksum uint16) uint16 { // Calculate the rest of the checksum. return Checksum(b[:b.DataOffset()], partialChecksum) }
go
func (b TCP) CalculateChecksum(partialChecksum uint16) uint16 { // Calculate the rest of the checksum. return Checksum(b[:b.DataOffset()], partialChecksum) }
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// CalculateChecksum calculates the checksum of the tcp segment. // partialChecksum is the checksum of the network-layer pseudo-header // and the checksum of the segment data.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L244-L247
train
google/netstack
tcpip/header/tcp.go
Encode
func (b TCP) Encode(t *TCPFields) { b.encodeSubset(t.SeqNum, t.AckNum, t.Flags, t.WindowSize) binary.BigEndian.PutUint16(b[TCPSrcPortOffset:], t.SrcPort) binary.BigEndian.PutUint16(b[TCPDstPortOffset:], t.DstPort) b[TCPDataOffset] = (t.DataOffset / 4) << 4 binary.BigEndian.PutUint16(b[TCPChecksumOffset:], t.Checksum) binary.BigEndian.PutUint16(b[TCPUrgentPtrOffset:], t.UrgentPointer) }
go
func (b TCP) Encode(t *TCPFields) { b.encodeSubset(t.SeqNum, t.AckNum, t.Flags, t.WindowSize) binary.BigEndian.PutUint16(b[TCPSrcPortOffset:], t.SrcPort) binary.BigEndian.PutUint16(b[TCPDstPortOffset:], t.DstPort) b[TCPDataOffset] = (t.DataOffset / 4) << 4 binary.BigEndian.PutUint16(b[TCPChecksumOffset:], t.Checksum) binary.BigEndian.PutUint16(b[TCPUrgentPtrOffset:], t.UrgentPointer) }
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// Encode encodes all the fields of the tcp header.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L269-L276
train
google/netstack
tcpip/header/tcp.go
EncodePartial
func (b TCP) EncodePartial(partialChecksum, length uint16, seqnum, acknum uint32, flags byte, rcvwnd uint16) { // Add the total length and "flags" field contributions to the checksum. // We don't use the flags field directly from the header because it's a // one-byte field with an odd offset, so it would be accounted for // incorrectly by the Checksum routine. tmp := make([]byte, 4) binary.BigEndian.PutUint16(tmp, length) binary.BigEndian.PutUint16(tmp[2:], uint16(flags)) checksum := Checksum(tmp, partialChecksum) // Encode the passed-in fields. b.encodeSubset(seqnum, acknum, flags, rcvwnd) // Add the contributions of the passed-in fields to the checksum. checksum = Checksum(b[TCPSeqNumOffset:TCPSeqNumOffset+8], checksum) checksum = Checksum(b[TCPWinSizeOffset:TCPWinSizeOffset+2], checksum) // Encode the checksum. b.SetChecksum(^checksum) }
go
func (b TCP) EncodePartial(partialChecksum, length uint16, seqnum, acknum uint32, flags byte, rcvwnd uint16) { // Add the total length and "flags" field contributions to the checksum. // We don't use the flags field directly from the header because it's a // one-byte field with an odd offset, so it would be accounted for // incorrectly by the Checksum routine. tmp := make([]byte, 4) binary.BigEndian.PutUint16(tmp, length) binary.BigEndian.PutUint16(tmp[2:], uint16(flags)) checksum := Checksum(tmp, partialChecksum) // Encode the passed-in fields. b.encodeSubset(seqnum, acknum, flags, rcvwnd) // Add the contributions of the passed-in fields to the checksum. checksum = Checksum(b[TCPSeqNumOffset:TCPSeqNumOffset+8], checksum) checksum = Checksum(b[TCPWinSizeOffset:TCPWinSizeOffset+2], checksum) // Encode the checksum. b.SetChecksum(^checksum) }
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// EncodePartial updates a subset of the fields of the tcp header. It is useful // in cases when similar segments are produced.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L280-L299
train
google/netstack
tcpip/header/tcp.go
ParseSynOptions
func ParseSynOptions(opts []byte, isAck bool) TCPSynOptions { limit := len(opts) synOpts := TCPSynOptions{ // Per RFC 1122, page 85: "If an MSS option is not received at // connection setup, TCP MUST assume a default send MSS of 536." MSS: 536, // If no window scale option is specified, WS in options is // returned as -1; this is because the absence of the option // indicates that the we cannot use window scaling on the // receive end either. WS: -1, } for i := 0; i < limit; { switch opts[i] { case TCPOptionEOL: i = limit case TCPOptionNOP: i++ case TCPOptionMSS: if i+4 > limit || opts[i+1] != 4 { return synOpts } mss := uint16(opts[i+2])<<8 | uint16(opts[i+3]) if mss == 0 { return synOpts } synOpts.MSS = mss i += 4 case TCPOptionWS: if i+3 > limit || opts[i+1] != 3 { return synOpts } ws := int(opts[i+2]) if ws > MaxWndScale { ws = MaxWndScale } synOpts.WS = ws i += 3 case TCPOptionTS: if i+10 > limit || opts[i+1] != 10 { return synOpts } synOpts.TSVal = binary.BigEndian.Uint32(opts[i+2:]) if isAck { // If the segment is a SYN-ACK then store the Timestamp Echo Reply // in the segment. synOpts.TSEcr = binary.BigEndian.Uint32(opts[i+6:]) } synOpts.TS = true i += 10 case TCPOptionSACKPermitted: if i+2 > limit || opts[i+1] != 2 { return synOpts } synOpts.SACKPermitted = true i += 2 default: // We don't recognize this option, just skip over it. if i+2 > limit { return synOpts } l := int(opts[i+1]) // If the length is incorrect or if l+i overflows the // total options length then return false. if l < 2 || i+l > limit { return synOpts } i += l } } return synOpts }
go
func ParseSynOptions(opts []byte, isAck bool) TCPSynOptions { limit := len(opts) synOpts := TCPSynOptions{ // Per RFC 1122, page 85: "If an MSS option is not received at // connection setup, TCP MUST assume a default send MSS of 536." MSS: 536, // If no window scale option is specified, WS in options is // returned as -1; this is because the absence of the option // indicates that the we cannot use window scaling on the // receive end either. WS: -1, } for i := 0; i < limit; { switch opts[i] { case TCPOptionEOL: i = limit case TCPOptionNOP: i++ case TCPOptionMSS: if i+4 > limit || opts[i+1] != 4 { return synOpts } mss := uint16(opts[i+2])<<8 | uint16(opts[i+3]) if mss == 0 { return synOpts } synOpts.MSS = mss i += 4 case TCPOptionWS: if i+3 > limit || opts[i+1] != 3 { return synOpts } ws := int(opts[i+2]) if ws > MaxWndScale { ws = MaxWndScale } synOpts.WS = ws i += 3 case TCPOptionTS: if i+10 > limit || opts[i+1] != 10 { return synOpts } synOpts.TSVal = binary.BigEndian.Uint32(opts[i+2:]) if isAck { // If the segment is a SYN-ACK then store the Timestamp Echo Reply // in the segment. synOpts.TSEcr = binary.BigEndian.Uint32(opts[i+6:]) } synOpts.TS = true i += 10 case TCPOptionSACKPermitted: if i+2 > limit || opts[i+1] != 2 { return synOpts } synOpts.SACKPermitted = true i += 2 default: // We don't recognize this option, just skip over it. if i+2 > limit { return synOpts } l := int(opts[i+1]) // If the length is incorrect or if l+i overflows the // total options length then return false. if l < 2 || i+l > limit { return synOpts } i += l } } return synOpts }
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// ParseSynOptions parses the options received in a SYN segment and returns the // relevant ones. opts should point to the option part of the TCP Header.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L303-L380
train
google/netstack
tcpip/header/tcp.go
ParseTCPOptions
func ParseTCPOptions(b []byte) TCPOptions { opts := TCPOptions{} limit := len(b) for i := 0; i < limit; { switch b[i] { case TCPOptionEOL: i = limit case TCPOptionNOP: i++ case TCPOptionTS: if i+10 > limit || (b[i+1] != 10) { return opts } opts.TS = true opts.TSVal = binary.BigEndian.Uint32(b[i+2:]) opts.TSEcr = binary.BigEndian.Uint32(b[i+6:]) i += 10 case TCPOptionSACK: if i+2 > limit { // Malformed SACK block, just return and stop parsing. return opts } sackOptionLen := int(b[i+1]) if i+sackOptionLen > limit || (sackOptionLen-2)%8 != 0 { // Malformed SACK block, just return and stop parsing. return opts } numBlocks := (sackOptionLen - 2) / 8 opts.SACKBlocks = []SACKBlock{} for j := 0; j < numBlocks; j++ { start := binary.BigEndian.Uint32(b[i+2+j*8:]) end := binary.BigEndian.Uint32(b[i+2+j*8+4:]) opts.SACKBlocks = append(opts.SACKBlocks, SACKBlock{ Start: seqnum.Value(start), End: seqnum.Value(end), }) } i += sackOptionLen default: // We don't recognize this option, just skip over it. if i+2 > limit { return opts } l := int(b[i+1]) // If the length is incorrect or if l+i overflows the // total options length then return false. if l < 2 || i+l > limit { return opts } i += l } } return opts }
go
func ParseTCPOptions(b []byte) TCPOptions { opts := TCPOptions{} limit := len(b) for i := 0; i < limit; { switch b[i] { case TCPOptionEOL: i = limit case TCPOptionNOP: i++ case TCPOptionTS: if i+10 > limit || (b[i+1] != 10) { return opts } opts.TS = true opts.TSVal = binary.BigEndian.Uint32(b[i+2:]) opts.TSEcr = binary.BigEndian.Uint32(b[i+6:]) i += 10 case TCPOptionSACK: if i+2 > limit { // Malformed SACK block, just return and stop parsing. return opts } sackOptionLen := int(b[i+1]) if i+sackOptionLen > limit || (sackOptionLen-2)%8 != 0 { // Malformed SACK block, just return and stop parsing. return opts } numBlocks := (sackOptionLen - 2) / 8 opts.SACKBlocks = []SACKBlock{} for j := 0; j < numBlocks; j++ { start := binary.BigEndian.Uint32(b[i+2+j*8:]) end := binary.BigEndian.Uint32(b[i+2+j*8+4:]) opts.SACKBlocks = append(opts.SACKBlocks, SACKBlock{ Start: seqnum.Value(start), End: seqnum.Value(end), }) } i += sackOptionLen default: // We don't recognize this option, just skip over it. if i+2 > limit { return opts } l := int(b[i+1]) // If the length is incorrect or if l+i overflows the // total options length then return false. if l < 2 || i+l > limit { return opts } i += l } } return opts }
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// ParseTCPOptions extracts and stores all known options in the provided byte // slice in a TCPOptions structure.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L384-L437
train
google/netstack
tcpip/header/tcp.go
EncodeMSSOption
func EncodeMSSOption(mss uint32, b []byte) int { // mssOptionSize is the number of bytes in a valid MSS option. const mssOptionSize = 4 if len(b) < mssOptionSize { return 0 } b[0], b[1], b[2], b[3] = TCPOptionMSS, mssOptionSize, byte(mss>>8), byte(mss) return mssOptionSize }
go
func EncodeMSSOption(mss uint32, b []byte) int { // mssOptionSize is the number of bytes in a valid MSS option. const mssOptionSize = 4 if len(b) < mssOptionSize { return 0 } b[0], b[1], b[2], b[3] = TCPOptionMSS, mssOptionSize, byte(mss>>8), byte(mss) return mssOptionSize }
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// EncodeMSSOption encodes the MSS TCP option with the provided MSS values in // the supplied buffer. If the provided buffer is not large enough then it just // returns without encoding anything. It returns the number of bytes written to // the provided buffer.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L443-L452
train
google/netstack
tcpip/header/tcp.go
EncodeWSOption
func EncodeWSOption(ws int, b []byte) int { if len(b) < 3 { return 0 } b[0], b[1], b[2] = TCPOptionWS, 3, uint8(ws) return int(b[1]) }
go
func EncodeWSOption(ws int, b []byte) int { if len(b) < 3 { return 0 } b[0], b[1], b[2] = TCPOptionWS, 3, uint8(ws) return int(b[1]) }
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// EncodeWSOption encodes the WS TCP option with the WS value in the // provided buffer. If the provided buffer is not large enough then it just // returns without encoding anything. It returns the number of bytes written to // the provided buffer.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L458-L464
train
google/netstack
tcpip/header/tcp.go
EncodeTSOption
func EncodeTSOption(tsVal, tsEcr uint32, b []byte) int { if len(b) < 10 { return 0 } b[0], b[1] = TCPOptionTS, 10 binary.BigEndian.PutUint32(b[2:], tsVal) binary.BigEndian.PutUint32(b[6:], tsEcr) return int(b[1]) }
go
func EncodeTSOption(tsVal, tsEcr uint32, b []byte) int { if len(b) < 10 { return 0 } b[0], b[1] = TCPOptionTS, 10 binary.BigEndian.PutUint32(b[2:], tsVal) binary.BigEndian.PutUint32(b[6:], tsEcr) return int(b[1]) }
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// EncodeTSOption encodes the provided tsVal and tsEcr values as a TCP timestamp // option into the provided buffer. If the buffer is smaller than expected it // just returns without encoding anything. It returns the number of bytes // written to the provided buffer.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L470-L478
train
google/netstack
tcpip/header/tcp.go
EncodeSACKPermittedOption
func EncodeSACKPermittedOption(b []byte) int { if len(b) < 2 { return 0 } b[0], b[1] = TCPOptionSACKPermitted, 2 return int(b[1]) }
go
func EncodeSACKPermittedOption(b []byte) int { if len(b) < 2 { return 0 } b[0], b[1] = TCPOptionSACKPermitted, 2 return int(b[1]) }
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// EncodeSACKPermittedOption encodes a SACKPermitted option into the provided // buffer. If the buffer is smaller than required it just returns without // encoding anything. It returns the number of bytes written to the provided // buffer.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L484-L491
train
google/netstack
tcpip/header/tcp.go
EncodeSACKBlocks
func EncodeSACKBlocks(sackBlocks []SACKBlock, b []byte) int { if len(sackBlocks) == 0 { return 0 } l := len(sackBlocks) if l > TCPMaxSACKBlocks { l = TCPMaxSACKBlocks } if ll := (len(b) - 2) / 8; ll < l { l = ll } if l == 0 { // There is not enough space in the provided buffer to add // any SACK blocks. return 0 } b[0] = TCPOptionSACK b[1] = byte(l*8 + 2) for i := 0; i < l; i++ { binary.BigEndian.PutUint32(b[i*8+2:], uint32(sackBlocks[i].Start)) binary.BigEndian.PutUint32(b[i*8+6:], uint32(sackBlocks[i].End)) } return int(b[1]) }
go
func EncodeSACKBlocks(sackBlocks []SACKBlock, b []byte) int { if len(sackBlocks) == 0 { return 0 } l := len(sackBlocks) if l > TCPMaxSACKBlocks { l = TCPMaxSACKBlocks } if ll := (len(b) - 2) / 8; ll < l { l = ll } if l == 0 { // There is not enough space in the provided buffer to add // any SACK blocks. return 0 } b[0] = TCPOptionSACK b[1] = byte(l*8 + 2) for i := 0; i < l; i++ { binary.BigEndian.PutUint32(b[i*8+2:], uint32(sackBlocks[i].Start)) binary.BigEndian.PutUint32(b[i*8+6:], uint32(sackBlocks[i].End)) } return int(b[1]) }
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// EncodeSACKBlocks encodes the provided SACK blocks as a TCP SACK option block // in the provided slice. It tries to fit in as many blocks as possible based on // number of bytes available in the provided buffer. It returns the number of // bytes written to the provided buffer.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L497-L520
train
google/netstack
tcpip/header/tcp.go
AddTCPOptionPadding
func AddTCPOptionPadding(options []byte, offset int) int { paddingToAdd := -offset & 3 // Now add any padding bytes that might be required to quad align the // options. for i := offset; i < offset+paddingToAdd; i++ { options[i] = TCPOptionNOP } return paddingToAdd }
go
func AddTCPOptionPadding(options []byte, offset int) int { paddingToAdd := -offset & 3 // Now add any padding bytes that might be required to quad align the // options. for i := offset; i < offset+paddingToAdd; i++ { options[i] = TCPOptionNOP } return paddingToAdd }
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// AddTCPOptionPadding adds the required number of TCPOptionNOP to quad align // the option buffer. It adds padding bytes after the offset specified and // returns the number of padding bytes added. The passed in options slice // must have space for the padding bytes.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/header/tcp.go#L535-L543
train
google/netstack
tcpip/stack/transport_demuxer.go
registerEndpoint
func (d *transportDemuxer) registerEndpoint(netProtos []tcpip.NetworkProtocolNumber, protocol tcpip.TransportProtocolNumber, id TransportEndpointID, ep TransportEndpoint, reusePort bool) *tcpip.Error { for i, n := range netProtos { if err := d.singleRegisterEndpoint(n, protocol, id, ep, reusePort); err != nil { d.unregisterEndpoint(netProtos[:i], protocol, id, ep) return err } } return nil }
go
func (d *transportDemuxer) registerEndpoint(netProtos []tcpip.NetworkProtocolNumber, protocol tcpip.TransportProtocolNumber, id TransportEndpointID, ep TransportEndpoint, reusePort bool) *tcpip.Error { for i, n := range netProtos { if err := d.singleRegisterEndpoint(n, protocol, id, ep, reusePort); err != nil { d.unregisterEndpoint(netProtos[:i], protocol, id, ep) return err } } return nil }
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// registerEndpoint registers the given endpoint with the dispatcher such that // packets that match the endpoint ID are delivered to it.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/transport_demuxer.go#L88-L97
train
google/netstack
tcpip/stack/transport_demuxer.go
selectEndpoint
func (ep *multiPortEndpoint) selectEndpoint(id TransportEndpointID) TransportEndpoint { ep.mu.RLock() defer ep.mu.RUnlock() payload := []byte{ byte(id.LocalPort), byte(id.LocalPort >> 8), byte(id.RemotePort), byte(id.RemotePort >> 8), } h := jenkins.Sum32(ep.seed) h.Write(payload) h.Write([]byte(id.LocalAddress)) h.Write([]byte(id.RemoteAddress)) hash := h.Sum32() idx := reciprocalScale(hash, uint32(len(ep.endpointsArr))) return ep.endpointsArr[idx] }
go
func (ep *multiPortEndpoint) selectEndpoint(id TransportEndpointID) TransportEndpoint { ep.mu.RLock() defer ep.mu.RUnlock() payload := []byte{ byte(id.LocalPort), byte(id.LocalPort >> 8), byte(id.RemotePort), byte(id.RemotePort >> 8), } h := jenkins.Sum32(ep.seed) h.Write(payload) h.Write([]byte(id.LocalAddress)) h.Write([]byte(id.RemoteAddress)) hash := h.Sum32() idx := reciprocalScale(hash, uint32(len(ep.endpointsArr))) return ep.endpointsArr[idx] }
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// selectEndpoint calculates a hash of destination and source addresses and // ports then uses it to select a socket. In this case, all packets from one // address will be sent to same endpoint.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/transport_demuxer.go#L120-L139
train
google/netstack
tcpip/stack/transport_demuxer.go
unregisterEndpoint
func (ep *multiPortEndpoint) unregisterEndpoint(t TransportEndpoint) bool { ep.mu.Lock() defer ep.mu.Unlock() idx, ok := ep.endpointsMap[t] if !ok { return false } delete(ep.endpointsMap, t) l := len(ep.endpointsArr) if l > 1 { // The last endpoint in endpointsArr is moved instead of the deleted one. lastEp := ep.endpointsArr[l-1] ep.endpointsArr[idx] = lastEp ep.endpointsMap[lastEp] = idx ep.endpointsArr = ep.endpointsArr[0 : l-1] return false } return true }
go
func (ep *multiPortEndpoint) unregisterEndpoint(t TransportEndpoint) bool { ep.mu.Lock() defer ep.mu.Unlock() idx, ok := ep.endpointsMap[t] if !ok { return false } delete(ep.endpointsMap, t) l := len(ep.endpointsArr) if l > 1 { // The last endpoint in endpointsArr is moved instead of the deleted one. lastEp := ep.endpointsArr[l-1] ep.endpointsArr[idx] = lastEp ep.endpointsMap[lastEp] = idx ep.endpointsArr = ep.endpointsArr[0 : l-1] return false } return true }
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// unregisterEndpoint returns true if multiPortEndpoint has to be unregistered.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/transport_demuxer.go#L179-L198
train
google/netstack
tcpip/stack/transport_demuxer.go
deliverPacket
func (d *transportDemuxer) deliverPacket(r *Route, protocol tcpip.TransportProtocolNumber, netHeader buffer.View, vv buffer.VectorisedView, id TransportEndpointID) bool { eps, ok := d.protocol[protocolIDs{r.NetProto, protocol}] if !ok { return false } // If a sender bound to the Loopback interface sends a broadcast, // that broadcast must not be delivered to the sender. if loopbackSubnet.Contains(r.RemoteAddress) && r.LocalAddress == header.IPv4Broadcast && id.LocalPort == id.RemotePort { return false } // If the packet is a broadcast, then find all matching transport endpoints. // Otherwise, try to find a single matching transport endpoint. destEps := make([]TransportEndpoint, 0, 1) eps.mu.RLock() if protocol == header.UDPProtocolNumber && id.LocalAddress == header.IPv4Broadcast { for epID, endpoint := range eps.endpoints { if epID.LocalPort == id.LocalPort { destEps = append(destEps, endpoint) } } } else if ep := d.findEndpointLocked(eps, vv, id); ep != nil { destEps = append(destEps, ep) } // As in net/ipv4/ip_input.c:ip_local_deliver, attempt to deliver via // raw endpoint first. If there are multipe raw endpoints, they all // receive the packet. foundRaw := false for _, rawEP := range eps.rawEndpoints { // Each endpoint gets its own copy of the packet for the sake // of save/restore. rawEP.HandlePacket(r, buffer.NewViewFromBytes(netHeader), vv.ToView().ToVectorisedView()) foundRaw = true } eps.mu.RUnlock() // Fail if we didn't find at least one matching transport endpoint. if len(destEps) == 0 && !foundRaw { // UDP packet could not be delivered to an unknown destination port. if protocol == header.UDPProtocolNumber { r.Stats().UDP.UnknownPortErrors.Increment() } return false } // Deliver the packet. for _, ep := range destEps { ep.HandlePacket(r, id, vv) } return true }
go
func (d *transportDemuxer) deliverPacket(r *Route, protocol tcpip.TransportProtocolNumber, netHeader buffer.View, vv buffer.VectorisedView, id TransportEndpointID) bool { eps, ok := d.protocol[protocolIDs{r.NetProto, protocol}] if !ok { return false } // If a sender bound to the Loopback interface sends a broadcast, // that broadcast must not be delivered to the sender. if loopbackSubnet.Contains(r.RemoteAddress) && r.LocalAddress == header.IPv4Broadcast && id.LocalPort == id.RemotePort { return false } // If the packet is a broadcast, then find all matching transport endpoints. // Otherwise, try to find a single matching transport endpoint. destEps := make([]TransportEndpoint, 0, 1) eps.mu.RLock() if protocol == header.UDPProtocolNumber && id.LocalAddress == header.IPv4Broadcast { for epID, endpoint := range eps.endpoints { if epID.LocalPort == id.LocalPort { destEps = append(destEps, endpoint) } } } else if ep := d.findEndpointLocked(eps, vv, id); ep != nil { destEps = append(destEps, ep) } // As in net/ipv4/ip_input.c:ip_local_deliver, attempt to deliver via // raw endpoint first. If there are multipe raw endpoints, they all // receive the packet. foundRaw := false for _, rawEP := range eps.rawEndpoints { // Each endpoint gets its own copy of the packet for the sake // of save/restore. rawEP.HandlePacket(r, buffer.NewViewFromBytes(netHeader), vv.ToView().ToVectorisedView()) foundRaw = true } eps.mu.RUnlock() // Fail if we didn't find at least one matching transport endpoint. if len(destEps) == 0 && !foundRaw { // UDP packet could not be delivered to an unknown destination port. if protocol == header.UDPProtocolNumber { r.Stats().UDP.UnknownPortErrors.Increment() } return false } // Deliver the packet. for _, ep := range destEps { ep.HandlePacket(r, id, vv) } return true }
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// deliverPacket attempts to find one or more matching transport endpoints, and // then, if matches are found, delivers the packet to them. Returns true if it // found one or more endpoints, false otherwise.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/transport_demuxer.go#L262-L316
train
google/netstack
tcpip/stack/transport_demuxer.go
deliverControlPacket
func (d *transportDemuxer) deliverControlPacket(net tcpip.NetworkProtocolNumber, trans tcpip.TransportProtocolNumber, typ ControlType, extra uint32, vv buffer.VectorisedView, id TransportEndpointID) bool { eps, ok := d.protocol[protocolIDs{net, trans}] if !ok { return false } // Try to find the endpoint. eps.mu.RLock() ep := d.findEndpointLocked(eps, vv, id) eps.mu.RUnlock() // Fail if we didn't find one. if ep == nil { return false } // Deliver the packet. ep.HandleControlPacket(id, typ, extra, vv) return true }
go
func (d *transportDemuxer) deliverControlPacket(net tcpip.NetworkProtocolNumber, trans tcpip.TransportProtocolNumber, typ ControlType, extra uint32, vv buffer.VectorisedView, id TransportEndpointID) bool { eps, ok := d.protocol[protocolIDs{net, trans}] if !ok { return false } // Try to find the endpoint. eps.mu.RLock() ep := d.findEndpointLocked(eps, vv, id) eps.mu.RUnlock() // Fail if we didn't find one. if ep == nil { return false } // Deliver the packet. ep.HandleControlPacket(id, typ, extra, vv) return true }
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// deliverControlPacket attempts to deliver the given control packet. Returns // true if it found an endpoint, false otherwise.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/transport_demuxer.go#L320-L340
train
google/netstack
tcpip/stack/transport_demuxer.go
registerRawEndpoint
func (d *transportDemuxer) registerRawEndpoint(netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, ep RawTransportEndpoint) *tcpip.Error { eps, ok := d.protocol[protocolIDs{netProto, transProto}] if !ok { return nil } eps.mu.Lock() defer eps.mu.Unlock() eps.rawEndpoints = append(eps.rawEndpoints, ep) return nil }
go
func (d *transportDemuxer) registerRawEndpoint(netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, ep RawTransportEndpoint) *tcpip.Error { eps, ok := d.protocol[protocolIDs{netProto, transProto}] if !ok { return nil } eps.mu.Lock() defer eps.mu.Unlock() eps.rawEndpoints = append(eps.rawEndpoints, ep) return nil }
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// registerRawEndpoint registers the given endpoint with the dispatcher such // that packets of the appropriate protocol are delivered to it. A single // packet can be sent to one or more raw endpoints along with a non-raw // endpoint.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/transport_demuxer.go#L377-L388
train
google/netstack
tcpip/stack/transport_demuxer.go
unregisterRawEndpoint
func (d *transportDemuxer) unregisterRawEndpoint(netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, ep RawTransportEndpoint) { eps, ok := d.protocol[protocolIDs{netProto, transProto}] if !ok { panic(fmt.Errorf("tried to unregister endpoint with unsupported network and transport protocol pair: %d, %d", netProto, transProto)) } eps.mu.Lock() defer eps.mu.Unlock() for i, rawEP := range eps.rawEndpoints { if rawEP == ep { eps.rawEndpoints = append(eps.rawEndpoints[:i], eps.rawEndpoints[i+1:]...) return } } }
go
func (d *transportDemuxer) unregisterRawEndpoint(netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, ep RawTransportEndpoint) { eps, ok := d.protocol[protocolIDs{netProto, transProto}] if !ok { panic(fmt.Errorf("tried to unregister endpoint with unsupported network and transport protocol pair: %d, %d", netProto, transProto)) } eps.mu.Lock() defer eps.mu.Unlock() for i, rawEP := range eps.rawEndpoints { if rawEP == ep { eps.rawEndpoints = append(eps.rawEndpoints[:i], eps.rawEndpoints[i+1:]...) return } } }
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// unregisterRawEndpoint unregisters the raw endpoint for the given transport // protocol such that it won't receive any more packets.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/stack/transport_demuxer.go#L392-L406
train
google/netstack
tcpip/link/sharedmem/queue/tx.go
Init
func (t *Tx) Init(tx, rx []byte) { t.tx.Init(tx) t.rx.Init(rx) }
go
func (t *Tx) Init(tx, rx []byte) { t.tx.Init(tx) t.rx.Init(rx) }
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// Init initializes the transmit queue with the given pipes.
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70ebca9c30730cf3887cdef3b85bb96ed7a97593
https://github.com/google/netstack/blob/70ebca9c30730cf3887cdef3b85bb96ed7a97593/tcpip/link/sharedmem/queue/tx.go#L57-L60
train