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More handler separation: e.g. RouteHandler or VlanHandler can call LinkHandler

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This commit is contained in:
Brian Candler
2011-05-03 15:59:07 +01:00
parent a2735b4d4d
commit 3f4c6c7235
12 changed files with 667 additions and 498 deletions
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30
README
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@@ -15,18 +15,24 @@ themselves are built using class Message or RtattrMessage, which in turn are
subclasses of CStruct, which performs the low-level packing and unpacking of
the message bodies.
Route Firewall ...etc
| | |
+-------+-------+
|
v
NLSocket
|
v
Message / RtattrMessage
|
v
CStruct
LinkHandler/
AddrHandler/
VlanHandler/
RouteHandler
|
v
Route Firewall NFLog ...etc
| | |
+-------+-------+
|
v
NLSocket
|
v
Message / RtattrMessage
|
v
CStruct
Useful reference material
=========================

10
examples/add_addr.rb
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@@ -5,17 +5,17 @@ require 'netlink/route'
nl = Netlink::Route::Socket.new
puts "\n*** Before adding address"
nl.if.addrs["lo"][Socket::AF_INET].each { |x| puts x.address }
nl.addrs.list(:index=>"lo", :family=>Socket::AF_INET) { |x| puts x.address }
puts "\n*** After adding address"
begin
nl.if.add_addr(:index=>"lo", :local=>"1.2.3.4", :prefixlen=>32)
nl.addrs.add(:index=>"lo", :local=>"1.2.3.4", :prefixlen=>32)
rescue Errno::EEXIST
puts "Already exists"
end
nl.if.addrs["lo"][Socket::AF_INET].each { |x| puts x.address }
nl.addrs.list(:index=>"lo", :family=>Socket::AF_INET) { |x| puts x.address }
puts "\n*** After deleting address"
nl.if.delete_addr(:index=>"lo", :local=>"1.2.3.4", :prefixlen=>32)
nl.if.addrs["lo"][Socket::AF_INET].each { |x| puts x.address }
nl.addrs.delete(:index=>"lo", :local=>"1.2.3.4", :prefixlen=>32)
nl.addrs.list(:index=>"lo", :family=>Socket::AF_INET) { |x| puts x.address }

21
examples/add_route.rb Normal file
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@@ -0,0 +1,21 @@
LIBDIR = File.expand_path(File.join(File.dirname(__FILE__), '..', 'lib'))
$LOAD_PATH.unshift LIBDIR
require 'netlink/route'
nl = Netlink::Route::Socket.new
puts "\n*** Before adding route"
nl.routes.list(:family=>Socket::AF_INET, :table=>Netlink::RT_TABLE_MAIN) { |x| p x }
puts "\n*** After adding route"
begin
nl.routes.add(:oif=>"lo", :dst=>"1.2.3.4", :dst_len=>32, :gateway=>"127.0.0.1")
rescue Errno::EEXIST
puts "Already exists"
end
nl.routes.list(:family=>Socket::AF_INET, :table=>Netlink::RT_TABLE_MAIN) { |x| p x }
puts "\n*** After deleting route"
nl.routes.delete(:oif=>"lo", :dst=>"1.2.3.4", :dst_len=>32, :gateway=>"127.0.0.1")
nl.routes.list(:family=>Socket::AF_INET, :table=>Netlink::RT_TABLE_MAIN) { |x| p x }

10
examples/add_vlan.rb
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@@ -6,16 +6,16 @@ require 'pp'
nl = Netlink::Route::Socket.new
puts "\n*** Before adding VLAN"
pp nl.if.links(:kind=>"vlan").to_a
pp nl.vlans.list(:link=>"lo").to_a
puts "\n*** After adding VLAN on lo"
begin
nl.if.add_vlan(:link=>"lo", :vlan_id=>1234)
nl.vlans.add(:link=>"lo", :vlan_id=>1234)
rescue Errno::EEXIST
puts "Already present"
end
pp nl.if.links(:kind=>"vlan").to_a
pp nl.vlans.list(:link=>"lo").to_a
puts "\n*** After deleting VLANs from lo"
nl.if.delete_vlan(:link=>"lo", :vlan_id=>1234)
pp nl.if.links(:kind=>"vlan").to_a
nl.vlans.delete(:link=>"lo", :vlan_id=>1234)
pp nl.vlans.list(:link=>"lo").to_a

18
examples/route_hi.rb
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@@ -8,9 +8,17 @@ require 'netlink/route'
# The data is memoized - that is, it's downloaded from the kernel once
# and then manipulated internally.
nl = Netlink::Route::Socket.new
pp nl.if["eth0"]
pp nl.if.addrs["eth0"]
rt = Netlink::Route::Socket.new
# Find the route with the shortest prefix len (probably default route)
pp nl.rt[Socket::AF_INET].min_by { |route| route.dst_len }
puts "\nInterface eth0:"
pp rt.links["eth0"]
puts "\nAddresses on interface eth0:"
pp rt.addrs.list(:index=>"eth0").to_a
puts "\nAll routes in main routing table:"
pp rt.routes.list(:family=>Socket::AF_INET, :table=>Netlink::RT_TABLE_MAIN).to_a
puts "\nDefault route is probably:"
pp rt.routes.list(:family=>Socket::AF_INET, :table=>Netlink::RT_TABLE_MAIN).
min_by { |route| route.dst_len }

8
examples/route_lo.rb
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@@ -7,10 +7,10 @@ require 'netlink/route'
# Example of use of low-level API for NETLINK_ROUTE socket.
# Each of these method calls performs a netlink protocol exchange.
nl = Netlink::Route::Socket.new
rt = Netlink::Route::Socket.new
puts "*** links ***"
pp nl.if.read_links
pp rt.links.read_links
puts "*** addrs ***"
pp nl.if.read_addrs(:family => Socket::AF_INET)
pp rt.addrs.read_addrs
puts "*** routes ***"
pp nl.rt.read_routes(:family => Socket::AF_INET)
pp rt.routes.read_routes

60
lib/netlink/route.rb
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@@ -1,12 +1,17 @@
# This file implements the messages and methods for the NETLINK_ROUTE protocol
# This file implements the messages and methods for the NETLINK_ROUTE protocol.
# Apart from a few utility functions for converting ifname to index and vice
# versa, the logic is delegated to separate classes for each entity
# (links, addresses etc)
require 'netlink/nlsocket'
require 'netlink/message'
module Netlink
module Route
autoload :IFHandler, 'netlink/route/if_handler'
autoload :RTHandler, 'netlink/route/rt_handler'
autoload :LinkHandler, 'netlink/route/link_handler'
autoload :VlanHandler, 'netlink/route/vlan_handler'
autoload :AddrHandler, 'netlink/route/addr_handler'
autoload :RouteHandler, 'netlink/route/route_handler'
# This class formats and receives messages using NETLINK_ROUTE protocol
class Socket < NLSocket
@@ -14,17 +19,50 @@ module Netlink
super(opt.merge(:protocol => Netlink::NETLINK_ROUTE))
end
# Return a Netlink::Route::IF object for manipulating interfaces
# and interface addresses
def if(reload=false)
@if = nil if reload
@if ||= Netlink::Route::IFHandler.new(self)
# Return a Netlink::Route::LinkHandler object for manipulating links
def links
@links ||= Netlink::Route::LinkHandler.new(self)
end
# Return a Netlink::Route::VlanHandler object for manipulating vlans
def vlans
@vlans ||= Netlink::Route::VlanHandler.new(self)
end
# Return a Netlink::Route::AddrHandler object for manipulating addresses
def addrs
@addrs ||= Netlink::Route::AddrHandler.new(self)
end
# Return a Netlink::Route::RT object for manipulating routes
def rt(reload=false)
@rt = nil if reload
@rt ||= Netlink::Route::RTHandler.new(self)
def routes
@routes ||= Netlink::Route::RouteHandler.new(self)
end
# Convert an interface index into name string, or nil if the
# index is nil or empty string. Raises exception for unknown values.
#
# nl = Netlink::Route::Socket.new
# nl.routes(:family=>Socket::AF_INET) do |route|
# puts "iif=#{nl.ifname(route.iif)}"
# puts "oif=#{nl.ifname(route.oif)}"
# end
def ifname(index)
return nil if index.nil? || index == 0
links[index].ifname
end
# Convert an interface name into index. Returns 0 for nil or empty
# string. Otherwise raises an exception for unknown values.
def index(name)
case name
when Integer
name
when nil, EMPTY_STRING
0
else
links[name].index
end
end
end
end

141
lib/netlink/route/addr_handler.rb Normal file
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@@ -0,0 +1,141 @@
require 'netlink/route'
module Netlink
# struct ifa_cacheinfo
IFACacheInfo = Struct.new :prefered, :valid, :cstamp, :tstamp
# struct ifaddrmsg
class IFAddr < RtattrMessage
code RTM_NEWADDR, RTM_DELADDR, RTM_GETADDR
field :family, :uchar # Socket::AF_*
field :prefixlen, :uchar
field :flags, :uchar # IFA_F_*
field :scope, :uchar # RT_SCOPE_*
field :index, :int
rtattr :address, IFA_ADDRESS, :l3addr
rtattr :local, IFA_LOCAL, :l3addr
rtattr :label, IFA_LABEL, :cstring
rtattr :broadcast, IFA_BROADCAST, :l3addr
rtattr :anycast, IFA_ANYCAST, :l3addr
rtattr :cacheinfo, IFA_CACHEINFO,
:pack => lambda { |val,obj| val.to_a.pack("L*") },
:unpack => lambda { |str,obj| IFACacheInfo.new(*(str.unpack("L*"))) }
rtattr :multicast, IFA_MULTICAST, :l3addr
end
module Route
# This class provides an API for manipulating interfaces and addresses.
# Since we frequently need to map ifname to ifindex, or vice versa,
# we keep a memoized list of interfaces. If the interface list changes,
# you should create a new instance of this object.
class AddrHandler
def initialize(rtsocket = Netlink::Route::Socket.new)
@rtsocket = rtsocket
clear_cache
end
def clear_cache
@addrs = nil
end
def index(v)
@rtsocket.index(v)
end
def ifname(v)
@rtsocket.ifname(v)
end
# Download a list of link addresses. Either returns an array of
# Netlink::IFAddr objects, or yields them to the supplied block.
# You will need to use the 'index' to cross reference to the interface.
#
# A hash of kernel options may be supplied, but likely only :family
# is honoured.
#
# res = nl.read_addrs(:family => Socket::AF_INET)
# p res
# [#<Netlink::IFAddr {:family=>2, :prefixlen=>8, :flags=>128, :scope=>254,
# :index=>1, :address=>#<IPAddr: IPv4:127.0.0.1/255.255.255.255>,
# :local=>#<IPAddr: IPv4:127.0.0.1/255.255.255.255>, :label=>"lo"}>, ...]
def read_addrs(opt=nil, &blk)
@rtsocket.send_request RTM_GETADDR, IFAddr.new(opt),
NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST
@rtsocket.receive_until_done(RTM_NEWADDR, &blk)
end
# Iterate over all addresses, or addressees matching the given
# criteria. Returns an Enumerator if no block given.
#
# The full address list is read once and memoized, so
# it is efficient to call this method multiple times.
#
# nl.addrs.list { |x| p x }
# addrs_eth0 = nl.addrs.list(:index=>"eth0").to_a
# addrs_eth0_v4 = nl.addrs.list(:index=>"eth0", :family=>Socket::AF_INET).to_a
#
# TODO: error on unknown filter conditions
def list(filter=nil, &blk)
@addrs ||= read_addrs
return @addrs.each(&blk) unless filter
return to_enum(:list, filter) unless block_given?
filter[:index] = index(filter[:index]) if filter.has_key?(:index)
@addrs.each do |o|
yield o if (!filter[:family] || o.family == filter[:family]) &&
(!filter[:scope] || o.kind?(filter[:scope])) &&
(!filter[:flags] || (o.flags & filter[:flags]) == filter[:flags]) &&
(!filter[:noflags] || (o.flags & filter[:noflags]) == 0) &&
(!filter[:index] || o.index == filter[:index])
end
end
alias :each :list
# Return addresses grouped by interface name. e.g.
# addrs_by_interface(:family => Socket::AF_INET).to_a
# #=> {"eth0"=>[addr, addr,...], "lo"=>[addr, addr,...]
#
# The hash has an empty array as its default, so it's safe to do
# addrs_by_interface(...)["eth0"].each { |a| ... }
# even if eth0 has no addresses matching the given filter.
def group_by_interface(*filter)
res = list(*filter).group_by { |a| ifname(a.index) }
res.default = EMPTY_ARRAY
res
end
# Add an IP address to an interface
#
# require 'netlink/route'
# rt = Netlink::Route::Socket.new
# rt.add(:index=>"eth0", :local=>"1.2.3.4", :prefixlen=>24)
def add(opt)
ipaddr_modify(RTM_NEWADDR, NLM_F_CREATE|NLM_F_EXCL, opt)
end
def change(opt)
ipaddr_modify(RTM_NEWADDR, NLM_F_REPLACE, opt)
end
def replace(opt)
ipaddr_modify(RTM_NEWADDR, NLM_F_CREATE|NLM_F_REPLACE, opt)
end
# Delete an IP address from an interface. Pass in either a hash of
# parameters, or an existing IFAddr object.
def delete(opt)
ipaddr_modify(RTM_DELADDR, 0, opt)
end
def ipaddr_modify(code, flags, msg) #:nodoc:
msg = IFAddr.new(msg)
msg.index = index(msg.index) unless msg.index.is_a?(Integer)
msg.address ||= msg.local
# Note: IPAddr doesn't support addresses off the subnet base,
# so there's no point trying to set msg.prefixlen from the IPAddr mask
@rtsocket.cmd code, msg, flags|NLM_F_REQUEST
clear_cache
end
end
end
end

432
lib/netlink/route/if_handler.rb
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@@ -1,432 +0,0 @@
require 'netlink/message'
module Netlink
# struct rtnl_link_stats / rtnl_link_stats64
LinkStats = Struct.new :rx_packets, :tx_packets,
:rx_bytes, :tx_bytes,
:rx_errors, :tx_errors,
:rx_dropped, :tx_dropped,
:multicast, :collisions,
:rx_length_errors, :rx_over_errors,
:rx_crc_errors, :rx_frame_errors,
:rx_fifo_errors, :rx_missed_errors,
:tx_aborted_errorsr, :tx_carrier_errors,
:tx_fifo_errors, :tx_heartbeat_errors,
:tx_window_errors,
:rx_compressed, :tx_compressed
# struct ifmap
IFMap = Struct.new :mem_start, :mem_end, :base_addr, :irq, :dma, :port
# struct ifinfomsg
class IFInfo < RtattrMessage
code RTM_NEWLINK, RTM_DELLINK, RTM_GETLINK
field :family, :uchar
field :type, :ushort # ARPHRD_*
field :index, :int
field :flags, :uint # IFF_*
field :change, :uint, :default=>0xffffffff # flags to change
rtattr :address, IFLA_ADDRESS, :l2addr
rtattr :broadcast, IFLA_BROADCAST, :l2addr
rtattr :ifname, IFLA_IFNAME, :cstring
rtattr :mtu, IFLA_MTU, :uint32
rtattr :link, IFLA_LINK, :int32
rtattr :qdisc, IFLA_QDISC, :cstring
rtattr :stats32, IFLA_STATS,
:pack => lambda { |val,obj| val.to_a.pack("L23") },
:unpack => lambda { |str,obj| LinkStats.new(*(str.unpack("L23"))) }
rtattr :cost, IFLA_COST
rtattr :master, IFLA_MASTER, :uint32
rtattr :wireless, IFLA_WIRELESS
rtattr :protinfo, IFLA_PROTINFO, :uchar
rtattr :txqlen, IFLA_TXQLEN, :uint32
IFMAP_PACK = "QQQSCC".freeze #:nodoc:
rtattr :map, IFLA_MAP,
:pack => lambda { |val,obj| val.to_a.pack(IFMAP_PACK) },
:unpack => lambda { |str,obj| IFMap.new(*(str.unpack(IFMAP_PACK))) }
rtattr :weight, IFLA_WEIGHT, :uint32
rtattr :operstate, IFLA_OPERSTATE, :uchar
rtattr :linkmode, IFLA_LINKMODE, :uchar
rtattr :linkinfo, IFLA_LINKINFO # nested
rtattr :net_ns_pid, IFLA_NET_NS_PID, :uint32
rtattr :ifalias, IFLA_IFALIAS, :cstring
rtattr :num_vf, IFLA_NUM_VF, :uint32
rtattr :vfinfo_list, IFLA_VFINFO_LIST
rtattr :stats64, IFLA_STATS64,
:pack => lambda { |val,obj| val.to_a.pack("Q23") },
:unpack => lambda { |str,obj| LinkStats.new(*(str.unpack("Q23"))) }
rtattr :vf_ports, IFLA_VF_PORTS
rtattr :port_self, IFLA_PORT_SELF
# Return the best stats available (64bit or 32bit)
def stats
stats64 || stats32
end
# Link kind for special links, e.g. "vlan" or "gre"
def kind
linkinfo && linkinfo.kind
end
# Set link kind, creating a linkinfo member if necessary. e.g.
# i = IFAddr.new
# i.kind = "vlan"
# i.linkinfo.data = VlanInfo.new(...)
def kind=(str)
self.linkinfo ||= LinkInfo.new
linkinfo.kind = str
end
def kind?(str)
kind == str
end
def after_parse #:nodoc:
self.linkinfo = LinkInfo.parse(linkinfo) if linkinfo
end
end
class LinkInfo < RtattrMessage
rtattr :kind, IFLA_INFO_KIND, :cstring
rtattr :data, IFLA_INFO_DATA # rtattr packed, see below
rtattr :xstats, :IFLA_INFO_XSTATS # don't know
def after_parse #:nodoc:
case kind
when "vlan"
self.data = VlanInfo.parse(data)
end
end
end
class VlanFlags < CStruct
field :flags, :uint32
field :mask, :uint32, :default => 0xffffffff
end
# VLAN information is packed in rtattr format (there is no corresponding 'struct')
class VlanInfo < RtattrMessage
rtattr :id, IFLA_VLAN_ID, :ushort
rtattr :flags, IFLA_VLAN_FLAGS,
:unpack => lambda { |str,obj| VlanFlags.parse(str) }
rtattr :egress_qos, IFLA_VLAN_EGRESS_QOS
rtattr :ingress_qos, IFLA_VLAN_INGRESS_QOS
end
# struct ifa_cacheinfo
IFACacheInfo = Struct.new :prefered, :valid, :cstamp, :tstamp
# struct ifaddrmsg
class IFAddr < RtattrMessage
code RTM_NEWADDR, RTM_DELADDR, RTM_GETADDR
field :family, :uchar # Socket::AF_*
field :prefixlen, :uchar
field :flags, :uchar # IFA_F_*
field :scope, :uchar # RT_SCOPE_*
field :index, :int
rtattr :address, IFA_ADDRESS, :l3addr
rtattr :local, IFA_LOCAL, :l3addr
rtattr :label, IFA_LABEL, :cstring
rtattr :broadcast, IFA_BROADCAST, :l3addr
rtattr :anycast, IFA_ANYCAST, :l3addr
rtattr :cacheinfo, IFA_CACHEINFO,
:pack => lambda { |val,obj| val.to_a.pack("L*") },
:unpack => lambda { |str,obj| IFACacheInfo.new(*(str.unpack("L*"))) }
rtattr :multicast, IFA_MULTICAST, :l3addr
end
module Route
# This class provides an API for manipulating interfaces and addresses.
# Since we frequently need to map ifname to ifindex, or vice versa,
# we keep a memoized list of interfaces. If the interface list changes,
# you should create a new instance of this object.
class IFHandler
def initialize(nlsocket = Netlink::Route::Socket.new)
@nlsocket = nlsocket
clear_link_cache
clear_addr_cache
end
def clear_link_cache
@links = nil
@linkmap = nil
end
def clear_addr_cache
@addrs = nil
end
# Download a list of links (interfaces). Either returns an array of
# Netlink::IFInfo objects, or yields them to the supplied block.
#
# res = nl.read_links
# p res
# [#<Netlink::IFInfo {:family=>0, :type=>772, :index=>1,
# :flags=>65609, :change=>0, :ifname=>"lo", :txqlen=>0, :operstate=>0,
# :linkmode=>0, :mtu=>16436, :qdisc=>"noqueue", :map=>"...",
# :address=>"\x00\x00\x00\x00\x00\x00", :broadcast=>"\x00\x00\x00\x00\x00\x00",
# :stats32=>#<struct Netlink::LinkStats rx_packets=22, ...>,
# :stats64=>#<struct Netlink::LinkStats rx_packets=22, ...>}>, ...]
def read_links(opt=nil, &blk)
@nlsocket.send_request RTM_GETLINK, IFInfo.new(opt),
NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST
@nlsocket.receive_until_done(RTM_NEWLINK, &blk)
end
# Download a list of link addresses. Either returns an array of
# Netlink::IFAddr objects, or yields them to the supplied block.
# You will need to use the 'index' to cross reference to the interface.
#
# A hash of kernel options may be supplied, but likely only :family
# is honoured.
#
# res = nl.read_addrs(:family => Socket::AF_INET)
# p res
# [#<Netlink::IFAddr {:family=>2, :prefixlen=>8, :flags=>128, :scope=>254,
# :index=>1, :address=>#<IPAddr: IPv4:127.0.0.1/255.255.255.255>,
# :local=>#<IPAddr: IPv4:127.0.0.1/255.255.255.255>, :label=>"lo"}>, ...]
def read_addrs(opt=nil, &blk)
@nlsocket.send_request RTM_GETADDR, IFAddr.new(opt),
NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST
@nlsocket.receive_until_done(RTM_NEWADDR, &blk)
end
# Download a list of addresses, grouped as {index=>[addr,addr], index=>[addr,addr]}
def read_addrs_by_ifindex(opt=nil)
res = read_addrs(opt).group_by { |obj| obj.index }
res.default = EMPTY_ARRAY
res
end
# Iterate over all interfaces, or interfaces matching the given
# criteria. Returns an Enumerator if no block given.
#
# The full interface list is read once and memoized, so
# it is efficient to call this method multiple times.
#
# if.links { |x| p x }
# ethers = if.links(:type => Netlink::ARPHRD_ETHER).to_a
# vlans = if.links(:kind => "vlan").to_a
# if.links(:flags => Netlink::IFF_RUNNING)
# if.links(:noflags => Netlink::IFF_POINTOPOINT)
# if.links(:link => "lo") # vlan etc attached to this interface
def links(filter=nil, &blk)
return to_enum(:links, filter) unless block_given?
@links ||= read_links
return @links.each(&blk) unless filter
filter[:link] = index(filter[:link]) if filter.has_key?(:link)
@links.each do |l|
yield l if (!filter[:type] || l.type == filter[:type]) &&
(!filter[:kind] || l.kind?(filter[:kind])) &&
(!filter[:flags] || (l.flags & filter[:flags]) == filter[:flags]) &&
(!filter[:noflags] || (l.flags & filter[:noflags]) == 0) &&
(!filter[:link] || l.link == filter[:link])
end
end
# Return a memoized Hash of interfaces, keyed by both index and name
def linkmap
@linkmap ||= (
h = {}
links { |link| h[link.index] = h[link.ifname] = link }
h
)
end
# Return details of one interface, given its name or index.
# Raises exception if unknown value.
def [](key)
linkmap.fetch(key)
end
# Convert an interface index into name string, or nil if the
# index is nil or empty string. Raises exception for unknown values.
#
# nl = Netlink::Route::Socket.new
# nl.rt[Socket::AF_INET].each do |route|
# puts "iif=#{nl.if.name(route.iif)}"
# puts "oif=#{nl.if.name(route.oif)}"
# end
def name(index)
return nil if index.nil? || index == 0
self[index].ifname
end
# Convert an interface name into index. Returns 0 for nil or empty
# string. Otherwise raises an exception for unknown values.
def index(name)
case name
when Integer
name
when nil, EMPTY_STRING
0
else
self[name].index
end
end
# Add an interface (low-level)
#
# require 'netlink/route'
# rt = Netlink::Route::Socket.new
# rt.if.add_link(
# :link=>"lo",
# :linkinfo=>Netlink::LinkInfo.new(
# :kind=>"vlan",
# :data=>Netlink::VlanInfo.new(
# :id=>1234,
# :flags => Netlink::VlanFlags.new(
# :flags=>Netlink::VLAN_FLAG_LOOSE_BINDING,
# :mask=>0xffffffff
# ))))
def add_link(opt)
iplink_modify(RTM_NEWLINK, NLM_F_CREATE|NLM_F_EXCL, opt)
end
def change_link(opt)
iplink_modify(RTM_NEWLINK, NLM_F_REPLACE, opt)
end
def replace_link(opt)
iplink_modify(RTM_NEWLINK, NLM_F_CREATE|NLM_F_REPLACE, opt)
end
# Delete an existing link. Pass in ifname or index, or options
# hash {:index=>n}
def delete_link(opt)
case opt
when Integer
opt = {:index=>opt}
when String
opt = {:index=>index(opt)}
end
iplink_modify(RTM_DELLINK, 0, opt)
end
def iplink_modify(code, flags, msg) #:nodoc:
msg = IFInfo.new(msg)
if (flags & NLM_F_CREATE) != 0
raise "Missing :linkinfo" unless msg.linkinfo
raise "Missing :kind" unless msg.linkinfo.kind
else
raise "Missing :index" if msg.index.nil? || msg.index == 0
end
msg.index = index(msg.index) if msg.index.is_a?(String)
msg.link = index(msg.link) if msg.link.is_a?(String)
@nlsocket.cmd code, msg, flags|NLM_F_REQUEST
clear_link_cache
end
# Higher-level API to manipulate VLAN interface.
# rt.if.add_vlan(
# :link=>"lo",
# :vlan_id=>1234,
# :vlan_flags=>Netlink::VLAN_FLAG_LOOSE_BINDING,
# :vlan_mask=>0xffffffff
# )
def add_vlan(opt)
add_link(vlan_options(opt))
end
def change_vlan(opt)
change_link(vlan_options(opt))
end
def replace_vlan(opt)
replace_link(vlan_options(opt))
end
# Delete vlan given :link and :vlan_id. If you want to delete
# by :index then call delete_link instead.
def delete_vlan(opt)
raise "Missing vlan_id" unless opt[:vlan_id]
raise "Missing link" unless opt[:link]
link = links(:kind=>"vlan", :link=>opt[:link]).find { |l|
l.linkinfo.data &&
l.linkinfo.data.id == opt[:vlan_id]
}
raise Errno::ENODEV unless link
delete_link(link.index)
end
def vlan_options(orig) #:nodoc:
opt = orig.dup
opt[:link] = index(opt.fetch(:link))
li = opt[:linkinfo] ||= LinkInfo.new
li.kind = "vlan"
li.data ||= VlanInfo.new
li.data.id = opt.delete(:vlan_id) if opt.has_key?(:vlan_id)
if opt.has_key?(:vlan_flags)
li.data.flags ||= VlanFlags.new(:flags => opt.delete(:vlan_flags))
li.data.flags.mask = opt.delete(:vlan_mask) if opt.has_key?(:vlan_mask)
end
li.data.egress_qos = opt.delete(:egress_qos) if opt.has_key?(:egress_qos)
li.data.ingress_qos = opt.delete(:ingress_qos) if opt.has_key?(:ingress_qos)
opt
end
# Return the memoized address table, keyed by interface name and
# address family, containing an array of addresses for each
# interface/family combination. i.e.
#
# # {ifname=>{family=>[addr,addr,...], ...}, ...}
# puts rt.addrs["eth0"][Socket::AF_INET][0].address
#
# If there are no addresses for a particular family then it will
# return a (frozen) empty array, to make iteration eaiser.
def addrs
@addrs ||= (
h = {}
links do |link|
h[link.ifname] = {}
end
read_addrs.each do |addr|
ifname = name(addr.index)
h[ifname] ||= Hash.new(EMPTY_ARRAY)
(h[ifname][addr.family] ||= []) << addr
end
h
)
end
# Add an IP address to an interface
#
# require 'netlink/route'
# rt = Netlink::Route::Socket.new
# rt.add_addr(:index=>"eth0", :local=>"1.2.3.4", :prefixlen=>24)
def add_addr(opt)
ipaddr_modify(RTM_NEWADDR, NLM_F_CREATE|NLM_F_EXCL, opt)
end
def change_addr(opt)
ipaddr_modify(RTM_NEWADDR, NLM_F_REPLACE, opt)
end
def replace_addr(opt)
ipaddr_modify(RTM_NEWADDR, NLM_F_CREATE|NLM_F_REPLACE, opt)
end
# Delete an IP address from an interface. Pass in either a hash of
# parameters, or an existing IFAddr object.
def delete_addr(opt)
ipaddr_modify(RTM_DELADDR, 0, opt)
end
def ipaddr_modify(code, flags, msg) #:nodoc:
msg = IFAddr.new(msg)
msg.index = index(msg.index) unless msg.index.is_a?(Integer)
msg.address ||= msg.local
# Note: IPAddr doesn't support addresses off the subnet base,
# so there's no point trying to set msg.prefixlen from the IPAddr mask
@nlsocket.cmd code, msg, flags|NLM_F_REQUEST
clear_addr_cache
end
end
end
end

253
lib/netlink/route/link_handler.rb Normal file
View File

@@ -0,0 +1,253 @@
require 'netlink/route'
module Netlink
# struct rtnl_link_stats / rtnl_link_stats64
LinkStats = Struct.new :rx_packets, :tx_packets,
:rx_bytes, :tx_bytes,
:rx_errors, :tx_errors,
:rx_dropped, :tx_dropped,
:multicast, :collisions,
:rx_length_errors, :rx_over_errors,
:rx_crc_errors, :rx_frame_errors,
:rx_fifo_errors, :rx_missed_errors,
:tx_aborted_errorsr, :tx_carrier_errors,
:tx_fifo_errors, :tx_heartbeat_errors,
:tx_window_errors,
:rx_compressed, :tx_compressed
# struct ifmap
IFMap = Struct.new :mem_start, :mem_end, :base_addr, :irq, :dma, :port
# struct ifinfomsg
class IFInfo < RtattrMessage
code RTM_NEWLINK, RTM_DELLINK, RTM_GETLINK
field :family, :uchar
field :type, :ushort # ARPHRD_*
field :index, :int
field :flags, :uint # IFF_*
field :change, :uint, :default=>0xffffffff # flags to change
rtattr :address, IFLA_ADDRESS, :l2addr
rtattr :broadcast, IFLA_BROADCAST, :l2addr
rtattr :ifname, IFLA_IFNAME, :cstring
rtattr :mtu, IFLA_MTU, :uint32
rtattr :link, IFLA_LINK, :int32
rtattr :qdisc, IFLA_QDISC, :cstring
rtattr :stats32, IFLA_STATS,
:pack => lambda { |val,obj| val.to_a.pack("L23") },
:unpack => lambda { |str,obj| LinkStats.new(*(str.unpack("L23"))) }
rtattr :cost, IFLA_COST
rtattr :master, IFLA_MASTER, :uint32
rtattr :wireless, IFLA_WIRELESS
rtattr :protinfo, IFLA_PROTINFO, :uchar
rtattr :txqlen, IFLA_TXQLEN, :uint32
IFMAP_PACK = "QQQSCC".freeze #:nodoc:
rtattr :map, IFLA_MAP,
:pack => lambda { |val,obj| val.to_a.pack(IFMAP_PACK) },
:unpack => lambda { |str,obj| IFMap.new(*(str.unpack(IFMAP_PACK))) }
rtattr :weight, IFLA_WEIGHT, :uint32
rtattr :operstate, IFLA_OPERSTATE, :uchar
rtattr :linkmode, IFLA_LINKMODE, :uchar
rtattr :linkinfo, IFLA_LINKINFO # nested
rtattr :net_ns_pid, IFLA_NET_NS_PID, :uint32
rtattr :ifalias, IFLA_IFALIAS, :cstring
rtattr :num_vf, IFLA_NUM_VF, :uint32
rtattr :vfinfo_list, IFLA_VFINFO_LIST
rtattr :stats64, IFLA_STATS64,
:pack => lambda { |val,obj| val.to_a.pack("Q23") },
:unpack => lambda { |str,obj| LinkStats.new(*(str.unpack("Q23"))) }
rtattr :vf_ports, IFLA_VF_PORTS
rtattr :port_self, IFLA_PORT_SELF
# Return the best stats available (64bit or 32bit)
def stats
stats64 || stats32
end
# Link kind for special links, e.g. "vlan" or "gre"
def kind
linkinfo && linkinfo.kind
end
# Set link kind, creating a linkinfo member if necessary. e.g.
# i = IFAddr.new
# i.kind = "vlan"
# i.linkinfo.data = VlanInfo.new(...)
def kind=(str)
self.linkinfo ||= LinkInfo.new
linkinfo.kind = str
end
def kind?(str)
kind == str
end
def after_parse #:nodoc:
self.linkinfo = LinkInfo.parse(linkinfo) if linkinfo
end
end
class LinkInfo < RtattrMessage
rtattr :kind, IFLA_INFO_KIND, :cstring
rtattr :data, IFLA_INFO_DATA # rtattr packed, see below
rtattr :xstats, :IFLA_INFO_XSTATS # don't know
def after_parse #:nodoc:
case kind
when "vlan"
self.data = VlanInfo.parse(data)
end
end
end
class VlanFlags < CStruct
field :flags, :uint32
field :mask, :uint32, :default => 0xffffffff
end
# VLAN information is packed in rtattr format (there is no corresponding 'struct')
class VlanInfo < RtattrMessage
rtattr :id, IFLA_VLAN_ID, :ushort
rtattr :flags, IFLA_VLAN_FLAGS,
:unpack => lambda { |str,obj| VlanFlags.parse(str) }
rtattr :egress_qos, IFLA_VLAN_EGRESS_QOS
rtattr :ingress_qos, IFLA_VLAN_INGRESS_QOS
end
module Route
# This class provides an API for manipulating interfaces and addresses.
# Since we frequently need to map ifname to ifindex, or vice versa,
# we keep a memoized list of interfaces. If the interface list changes,
# you should create a new instance of this object.
class LinkHandler
def initialize(rtsocket = Netlink::Route::Socket.new)
@rtsocket = rtsocket
clear_cache
end
def clear_cache
@links = nil
@linkmap = nil
end
def index(v)
@rtsocket.index(v)
end
# Download a list of links (interfaces). Either returns an array of
# Netlink::IFInfo objects, or yields them to the supplied block.
#
# res = rt.links.read_links
# p res
# [#<Netlink::IFInfo {:family=>0, :type=>772, :index=>1,
# :flags=>65609, :change=>0, :ifname=>"lo", :txqlen=>0, :operstate=>0,
# :linkmode=>0, :mtu=>16436, :qdisc=>"noqueue", :map=>"...",
# :address=>"\x00\x00\x00\x00\x00\x00", :broadcast=>"\x00\x00\x00\x00\x00\x00",
# :stats32=>#<struct Netlink::LinkStats rx_packets=22, ...>,
# :stats64=>#<struct Netlink::LinkStats rx_packets=22, ...>}>, ...]
def read_links(opt=nil, &blk)
@rtsocket.send_request RTM_GETLINK, IFInfo.new(opt),
NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST
@rtsocket.receive_until_done(RTM_NEWLINK, &blk)
end
# Iterate over all interfaces, or interfaces matching the given
# criteria. Returns an Enumerator if no block given.
#
# The full interface list is read once and memoized, so
# it is efficient to call this method multiple times.
#
# rt.links.list { |x| p x }
# ethers = rt.links.list(:type => Netlink::ARPHRD_ETHER).to_a
# vlans = rt.links.list(:kind => "vlan").to_a
# rt.links.list(:flags => Netlink::IFF_RUNNING)
# rt.links.list(:noflags => Netlink::IFF_POINTOPOINT)
# rt.links.list(:link => "lo") # vlan etc attached to this interface
def list(filter=nil, &blk)
@links ||= read_links
return @links.each(&blk) unless filter
return to_enum(:list, filter) unless block_given?
filter[:link] = index(filter[:link]) if filter.has_key?(:link)
@links.each do |o|
yield o if (!filter[:type] || o.type == filter[:type]) &&
(!filter[:kind] || o.kind?(filter[:kind])) &&
(!filter[:flags] || (o.flags & filter[:flags]) == filter[:flags]) &&
(!filter[:noflags] || (o.flags & filter[:noflags]) == 0) &&
(!filter[:link] || o.link == filter[:link])
end
end
alias :each :list
# Return a memoized Hash of interfaces, keyed by both index and name
def linkmap
@linkmap ||= (
h = {}
list { |link| h[link.index] = h[link.ifname] = link }
h
)
end
# Return details of one interface, given its name or index.
# Raises exception if unknown value.
def [](key)
linkmap.fetch(key)
end
# Add an interface (raw). e.g.
#
# require 'netlink/route'
# rt = Netlink::Route::Socket.new
# rt.links.add_link(
# :link=>"lo",
# :linkinfo=>Netlink::LinkInfo.new(
# :kind=>"vlan",
# :data=>Netlink::VlanInfo.new(
# :id=>1234,
# :flags => Netlink::VlanFlags.new(
# :flags=>Netlink::VLAN_FLAG_LOOSE_BINDING,
# :mask=>0xffffffff
# ))))
def add(opt)
iplink_modify(RTM_NEWLINK, NLM_F_CREATE|NLM_F_EXCL, opt)
end
def change(opt)
iplink_modify(RTM_NEWLINK, NLM_F_REPLACE, opt)
end
def replace(opt)
iplink_modify(RTM_NEWLINK, NLM_F_CREATE|NLM_F_REPLACE, opt)
end
# Delete an existing link. Pass in ifname or index, or options
# hash {:index=>n}
def delete(opt)
case opt
when Integer
opt = {:index=>opt}
when String
opt = {:index=>index(opt)}
end
iplink_modify(RTM_DELLINK, 0, opt)
end
def iplink_modify(code, flags, msg) #:nodoc:
msg = IFInfo.new(msg)
if (flags & NLM_F_CREATE) != 0
raise "Missing :linkinfo" unless msg.linkinfo
raise "Missing :kind" unless msg.linkinfo.kind
else
raise "Missing :index" if msg.index.nil? || msg.index == 0
end
msg.index = index(msg.index) if msg.index.is_a?(String)
msg.link = index(msg.link) if msg.link.is_a?(String)
@rtsocket.cmd code, msg, flags|NLM_F_REQUEST
clear_cache
end
end
end
end

114
lib/netlink/route/rt_handler.rb → lib/netlink/route/route_handler.rb
View File

@@ -1,4 +1,4 @@
require 'netlink/message'
require 'netlink/route'
module Netlink
# struct rta_cacheinfo
@@ -46,13 +46,21 @@ module Netlink
end
module Route
# This class manipulates the
class RTHandler
def initialize(nlsocket = Netlink::Route::Socket.new)
@nlsocket = nlsocket
# This class manipulates the kernel routing table
class RouteHandler
def initialize(rtsocket = Netlink::Route::Socket.new)
@rtsocket = rtsocket
clear_cache
end
def clear_cache
@routes = nil
end
def index(v)
@rtsocket.index(v)
end
# Send message to download the kernel routing table. Either returns an
# array of Netlink::RT objects, or yields them to the supplied block.
#
@@ -61,7 +69,7 @@ module Netlink
# read_routes(:family=>Socket::AF_INET) # works
# read_routes(:protocol=>Netlink::RTPROT_STATIC) # ignored
#
# res = nl.rt.read_routes(:family => Socket::AF_INET)
# res = rt.routes.read_routes(:family => Socket::AF_INET)
# p res
# [#<Netlink::RT {:family=>2, :dst_len=>32, :src_len=>0, :tos=>0,
# :table=>255, :protocol=>2, :scope=>253, :type=>3, :flags=>0, :table2=>255,
@@ -75,31 +83,89 @@ module Netlink
# :table=>254, :protocol=>4, :scope=>0, :type=>1, :flags=>0, :table2=>254,
# :gateway=>#<IPAddr: IPv4:10.69.255.253/255.255.255.255>, :oif=>2}>, ...]
def read_routes(opt=nil, &blk)
@nlsocket.send_request RTM_GETROUTE, RT.new(opt),
@rtsocket.send_request RTM_GETROUTE, RT.new(opt),
NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST
@nlsocket.receive_until_done(RTM_NEWROUTE, &blk)
@rtsocket.receive_until_done(RTM_NEWROUTE, &blk)
end
def clear_cache
@all = nil
# Return the memoized route table, filtered according to
# the optional criteria. Examples:
# :family => Socket::AF_INET
# :table => Netlink::RT_TABLE_DEFAULT
# :protocol => Netlink::RTPROT_STATIC
# :type => Netlink::RTN_UNICAST
# :scope => Netlink::RT_SCOPE_HOST
# :flags => Netlink::RTM_F_NOTIFY
# :noflags => Netlink::RTM_F_CLONED
# :oif => "eth0"
# :iif => "eth1"
def list(filter=nil, &blk)
@routes = read_routes
return @routes.each(&blk) unless filter
return to_enum(:list, filter) unless block_given?
filter[:oif] = index(filter[:oif]) if filter.has_key?(:oif)
filter[:iif] = index(filter[:iif]) if filter.has_key?(:iif)
@routes.each do |o|
yield o if (!filter[:family] || o.family == filter[:family]) &&
(!filter[:table] || o.table == filter[:table]) &&
(!filter[:protocol] || o.protocol == filter[:protocol]) &&
(!filter[:type] || o.scope == filter[:protocol]) &&
(!filter[:scope] || o.type == filter[:type]) &&
(!filter[:flags] || (o.flags & filter[:flags]) == filter[:flags]) &&
(!filter[:noflags] || (o.flags & filter[:noflags]) == 0) &&
(!filter[:oif] || o.oif == filter[:oif]) &&
(!filter[:iif] || o.iif == filter[:iif])
end
end
alias :each :list
def add(opt)
iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL, opt)
end
def change(opt)
iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE, opt)
end
# Return the complete memoized route table
def all
@all ||= read_routes
def replace(opt)
iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE, opt)
end
def prepend(opt)
iproute_modify(RTM_NEWROUTE, NLM_F_CREATE, opt)
end
def append(opt)
iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND, opt)
end
def test(opt)
iproute_modify(RTM_NEWROUTE, NLM_F_EXCL, opt)
end
def delete(opt)
iproute_modify(RTM_DELROUTE, 0, opt)
end
# Iterate over the memoized route table
def each(&blk)
all.each(&blk)
end
# Return just the routes for the given address family
#
# nl = Netlink::Route::Socket.new
# nl.rt[Socket::AF_INET].each { |r| p r }
def [](family)
all.select { |r| r.family == family }
def iproute_modify(code, flags, msg) #:nodoc:
msg = RT.new(msg)
msg.table ||= RT_TABLE_MAIN
msg.metrics ||= []
if code != RTM_DELROUTE
msg.protocol ||= RTPROT_BOOT
msg.scope ||= RT_SCOPE_UNIVERSE
msg.type ||= RTN_UNICAST
else
msg.scope ||= RT_SCOPE_NOWHERE
end
# Note: there are more complex rules in ip/iproute.c for setting defaults
msg.iif = index(msg.iif) if msg.iif.is_a?(String)
msg.oif = index(msg.oif) if msg.oif.is_a?(String)
@rtsocket.cmd code, msg, flags|NLM_F_REQUEST
clear_cache
end
end
end

68
lib/netlink/route/vlan_handler.rb Normal file
View File

@@ -0,0 +1,68 @@
require 'netlink/route'
module Netlink
module Route
class VlanHandler
def initialize(rtsocket = Netlink::Route::Socket.new)
@rtsocket = rtsocket
end
def index(v)
@rtsocket.index(v)
end
def list(filter={}, &blk)
@rtsocket.links.list(filter.merge(:kind=>"vlan"))
end
alias :each :list
# Higher-level API to manipulate VLAN interface.
# nl.vlans.add(
# :link=>"lo",
# :vlan_id=>1234,
# :vlan_flags=>Netlink::VLAN_FLAG_LOOSE_BINDING,
# :vlan_mask=>0xffffffff
# )
def add(opt)
@rtsocket.links.add(vlan_options(opt))
end
def change(opt)
@rtsocket.links.change(vlan_options(opt))
end
def replace(opt)
@rtsocket.links.replace(vlan_options(opt))
end
# Delete vlan given :link and :vlan_id. If you want to delete
# by :index then call links.delete instead.
def delete(opt)
raise "Missing vlan_id" unless opt[:vlan_id]
raise "Missing link" unless opt[:link]
link = list(:link=>opt[:link]).find { |l|
l.linkinfo.data &&
l.linkinfo.data.id == opt[:vlan_id]
}
raise Errno::ENODEV unless link
@rtsocket.links.delete(link.index)
end
def vlan_options(orig) #:nodoc:
opt = orig.dup
opt[:link] = index(opt.fetch(:link))
li = opt[:linkinfo] ||= LinkInfo.new
li.kind = "vlan"
li.data ||= VlanInfo.new
li.data.id = opt.delete(:vlan_id) if opt.has_key?(:vlan_id)
if opt.has_key?(:vlan_flags)
li.data.flags ||= VlanFlags.new(:flags => opt.delete(:vlan_flags))
li.data.flags.mask = opt.delete(:vlan_mask) if opt.has_key?(:vlan_mask)
end
li.data.egress_qos = opt.delete(:egress_qos) if opt.has_key?(:egress_qos)
li.data.ingress_qos = opt.delete(:ingress_qos) if opt.has_key?(:ingress_qos)
opt
end
end
end
end