OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [syscall/] [route_bsd.go] - Blame information for rev 867

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2011 The Go Authors.  All rights reserved.
2 
// Use of this source code is governed by a BSD-style
3 
// license that can be found in the LICENSE file.
4 
 
5 
// +build darwin freebsd netbsd openbsd
6 
 
7 
// Routing sockets and messages
8 
 
9 
package syscall
10 
 
11 
import (
12 
        "unsafe"
13 
)
14 
 
15 
// Round the length of a raw sockaddr up to align it properly.
16 
func rsaAlignOf(salen int) int {
17 
        salign := sizeofPtr
18 
        // NOTE: It seems like 64-bit Darwin kernel still requires 32-bit
19 
        // aligned access to BSD subsystem.
20 
        if darwinAMD64 {
21 
                salign = 4
22 
        }
23 
        if salen == 0 {
24 
                return salign
25 
        }
26 
        return (salen + salign - 1) & ^(salign - 1)
27 
}
28 
 
29 
// RouteRIB returns routing information base, as known as RIB,
30 
// which consists of network facility information, states and
31 
// parameters.
32 
func RouteRIB(facility, param int) ([]byte, error) {
33 
        mib := []_C_int{CTL_NET, AF_ROUTE, 0, 0, _C_int(facility), _C_int(param)}
34 
 
35 
        // Find size.
36 
        n := uintptr(0)
37 
        if err := sysctl(mib, nil, &n, nil, 0); err != nil {
38 
                return nil, err
39 
        }
40 
        if n == 0 {
41 
                return nil, nil
42 
        }
43 
 
44 
        tab := make([]byte, n)
45 
        if err := sysctl(mib, &tab[0], &n, nil, 0); err != nil {
46 
                return nil, err
47 
        }
48 
 
49 
        return tab[:n], nil
50 
}
51 
 
52 
// RoutingMessage represents a routing message.
53 
type RoutingMessage interface {
54 
        sockaddr() []Sockaddr
55 
}
56 
 
57 
const anyMessageLen = int(unsafe.Sizeof(anyMessage{}))
58 
 
59 
type anyMessage struct {
60 
        Msglen  uint16
61 
        Version uint8
62 
        Type    uint8
63 
}
64 
 
65 
// RouteMessage represents a routing message containing routing
66 
// entries.
67 
type RouteMessage struct {
68 
        Header RtMsghdr
69 
        Data   []byte
70 
}
71 
 
72 
const rtaRtMask = RTA_DST | RTA_GATEWAY | RTA_NETMASK | RTA_GENMASK
73 
 
74 
func (m *RouteMessage) sockaddr() []Sockaddr {
75 
        var (
76 
                af  int
77 
                sas [4]Sockaddr
78 
        )
79 
 
80 
        buf := m.Data[:]
81 
        for i := uint(0); i < RTAX_MAX; i++ {
82 
                if m.Header.Addrs&rtaRtMask&(1<
83 
                        continue
84 
                }
85 
                rsa := (*RawSockaddr)(unsafe.Pointer(&buf[0]))
86 
                switch i {
87 
                case RTAX_DST, RTAX_GATEWAY:
88 
                        sa, err := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
89 
                        if err != nil {
90 
                                return nil
91 
                        }
92 
                        if i == RTAX_DST {
93 
                                af = int(rsa.Family)
94 
                        }
95 
                        sas[i] = sa
96 
                case RTAX_NETMASK, RTAX_GENMASK:
97 
                        switch af {
98 
                        case AF_INET:
99 
                                rsa4 := (*RawSockaddrInet4)(unsafe.Pointer(&buf[0]))
100 
                                sa := new(SockaddrInet4)
101 
                                for j := 0; rsa4.Len > 0 && j < int(rsa4.Len)-int(unsafe.Offsetof(rsa4.Addr)); j++ {
102 
                                        sa.Addr[j] = rsa4.Addr[j]
103 
                                }
104 
                                sas[i] = sa
105 
                        case AF_INET6:
106 
                                rsa6 := (*RawSockaddrInet6)(unsafe.Pointer(&buf[0]))
107 
                                sa := new(SockaddrInet6)
108 
                                for j := 0; rsa6.Len > 0 && j < int(rsa6.Len)-int(unsafe.Offsetof(rsa6.Addr)); j++ {
109 
                                        sa.Addr[j] = rsa6.Addr[j]
110 
                                }
111 
                                sas[i] = sa
112 
                        }
113 
                }
114 
                buf = buf[rsaAlignOf(int(rsa.Len)):]
115 
        }
116 
 
117 
        return sas[:]
118 
}
119 
 
120 
// InterfaceMessage represents a routing message containing
121 
// network interface entries.
122 
type InterfaceMessage struct {
123 
        Header IfMsghdr
124 
        Data   []byte
125 
}
126 
 
127 
func (m *InterfaceMessage) sockaddr() (sas []Sockaddr) {
128 
        if m.Header.Addrs&RTA_IFP == 0 {
129 
                return nil
130 
        }
131 
        sa, err := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(&m.Data[0])))
132 
        if err != nil {
133 
                return nil
134 
        }
135 
        return append(sas, sa)
136 
}
137 
 
138 
// InterfaceAddrMessage represents a routing message containing
139 
// network interface address entries.
140 
type InterfaceAddrMessage struct {
141 
        Header IfaMsghdr
142 
        Data   []byte
143 
}
144 
 
145 
const rtaIfaMask = RTA_IFA | RTA_NETMASK | RTA_BRD
146 
 
147 
func (m *InterfaceAddrMessage) sockaddr() (sas []Sockaddr) {
148 
        if m.Header.Addrs&rtaIfaMask == 0 {
149 
                return nil
150 
        }
151 
 
152 
        buf := m.Data[:]
153 
        for i := uint(0); i < RTAX_MAX; i++ {
154 
                if m.Header.Addrs&rtaIfaMask&(1<
155 
                        continue
156 
                }
157 
                rsa := (*RawSockaddr)(unsafe.Pointer(&buf[0]))
158 
                switch i {
159 
                case RTAX_IFA:
160 
                        sa, err := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
161 
                        if err != nil {
162 
                                return nil
163 
                        }
164 
                        sas = append(sas, sa)
165 
                case RTAX_NETMASK:
166 
                        if rsa.Family == AF_UNSPEC {
167 
                                rsa.Family = AF_INET // an old fasion, AF_UNSPEC means AF_INET
168 
                        }
169 
                        sa, err := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
170 
                        if err != nil {
171 
                                return nil
172 
                        }
173 
                        sas = append(sas, sa)
174 
                case RTAX_BRD:
175 
                        // nothing to do
176 
                }
177 
                buf = buf[rsaAlignOf(int(rsa.Len)):]
178 
        }
179 
 
180 
        return sas
181 
}
182 
 
183 
// ParseRoutingMessage parses buf as routing messages and returns
184 
// the slice containing the RoutingMessage interfaces.
185 
func ParseRoutingMessage(buf []byte) (msgs []RoutingMessage, err error) {
186 
        for len(buf) >= anyMessageLen {
187 
                any := (*anyMessage)(unsafe.Pointer(&buf[0]))
188 
                if any.Version != RTM_VERSION {
189 
                        return nil, EINVAL
190 
                }
191 
                msgs = append(msgs, any.toRoutingMessage(buf))
192 
                buf = buf[any.Msglen:]
193 
        }
194 
        return msgs, nil
195 
}
196 
 
197 
// ParseRoutingMessage parses msg's payload as raw sockaddrs and
198 
// returns the slice containing the Sockaddr interfaces.
199 
func ParseRoutingSockaddr(msg RoutingMessage) (sas []Sockaddr, err error) {
200 
        return append(sas, msg.sockaddr()...), nil
201 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.