inet.cc revision 6712:b95abe00dd9d 
1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31#include <cstdio>
32#include <sstream>
33#include <string>
34
35#include "base/cprintf.hh"
36#include "base/inet.hh"
37#include "base/types.hh"
38
39using namespace std;
40namespace Net {
41
42EthAddr::EthAddr()
43{
44    memset(data, 0, ETH_ADDR_LEN);
45}
46
47EthAddr::EthAddr(const uint8_t ea[ETH_ADDR_LEN])
48{
49    *data = *ea;
50}
51
52EthAddr::EthAddr(const eth_addr &ea)
53{
54    *data = *ea.data;
55}
56
57EthAddr::EthAddr(const std::string &addr)
58{
59    parse(addr);
60}
61
62const EthAddr &
63EthAddr::operator=(const eth_addr &ea)
64{
65    *data = *ea.data;
66    return *this;
67}
68
69const EthAddr &
70EthAddr::operator=(const std::string &addr)
71{
72    parse(addr);
73    return *this;
74}
75
76void
77EthAddr::parse(const std::string &addr)
78{
79    // the hack below is to make sure that ETH_ADDR_LEN is 6 otherwise
80    // the sscanf function won't work.
81    int bytes[ETH_ADDR_LEN == 6 ? ETH_ADDR_LEN : -1];
82    if (sscanf(addr.c_str(), "%x:%x:%x:%x:%x:%x", &bytes[0], &bytes[1],
83               &bytes[2], &bytes[3], &bytes[4], &bytes[5]) != ETH_ADDR_LEN) {
84        memset(data, 0xff, ETH_ADDR_LEN);
85        return;
86    }
87
88    for (int i = 0; i < ETH_ADDR_LEN; ++i) {
89        if (bytes[i] & ~0xff) {
90            memset(data, 0xff, ETH_ADDR_LEN);
91            return;
92        }
93
94        data[i] = bytes[i];
95    }
96}
97
98string
99EthAddr::string() const
100{
101    stringstream stream;
102    stream << *this;
103    return stream.str();
104}
105
106bool
107operator==(const EthAddr &left, const EthAddr &right)
108{
109    return memcmp(left.bytes(), right.bytes(), ETH_ADDR_LEN);
110}
111
112ostream &
113operator<<(ostream &stream, const EthAddr &ea)
114{
115    const uint8_t *a = ea.addr();
116    ccprintf(stream, "%x:%x:%x:%x:%x:%x", a[0], a[1], a[2], a[3], a[4], a[5]);
117    return stream;
118}
119
120uint16_t
121cksum(const IpPtr &ptr)
122{
123    int sum = ip_cksum_add(ptr->bytes(), ptr->hlen(), 0);
124    return ip_cksum_carry(sum);
125}
126
127uint16_t
128__tu_cksum(const IpPtr &ip)
129{
130    int tcplen = ip->len() - ip->hlen();
131    int sum = ip_cksum_add(ip->payload(), tcplen, 0);
132    sum = ip_cksum_add(&ip->ip_src, 8, sum); // source and destination
133    sum += htons(ip->ip_p + tcplen);
134    return ip_cksum_carry(sum);
135}
136
137uint16_t
138cksum(const TcpPtr &tcp)
139{ return __tu_cksum(IpPtr(tcp.packet())); }
140
141uint16_t
142cksum(const UdpPtr &udp)
143{ return __tu_cksum(IpPtr(udp.packet())); }
144
145bool
146IpHdr::options(vector<const IpOpt *> &vec) const
147{
148    vec.clear();
149
150    const uint8_t *data = bytes() + sizeof(struct ip_hdr);
151    int all = hlen() - sizeof(struct ip_hdr);
152    while (all > 0) {
153        const IpOpt *opt = (const IpOpt *)data;
154        int len = opt->len();
155        if (all < len)
156            return false;
157
158        vec.push_back(opt);
159        all -= len;
160        data += len;
161    }
162
163    return true;
164}
165
166bool
167TcpHdr::options(vector<const TcpOpt *> &vec) const
168{
169    vec.clear();
170
171    const uint8_t *data = bytes() + sizeof(struct tcp_hdr);
172    int all = off() - sizeof(struct tcp_hdr);
173    while (all > 0) {
174        const TcpOpt *opt = (const TcpOpt *)data;
175        int len = opt->len();
176        if (all < len)
177            return false;
178
179        vec.push_back(opt);
180        all -= len;
181        data += len;
182    }
183
184    return true;
185}
186
187bool
188TcpOpt::sack(vector<SackRange> &vec) const
189{
190    vec.clear();
191
192    const uint8_t *data = bytes() + sizeof(struct tcp_hdr);
193    int all = len() - offsetof(tcp_opt, opt_data.sack);
194    while (all > 0) {
195        const uint16_t *sack = (const uint16_t *)data;
196        int len = sizeof(uint16_t) * 2;
197        if (all < len) {
198            vec.clear();
199            return false;
200        }
201
202        vec.push_back(RangeIn(ntohs(sack[0]), ntohs(sack[1])));
203        all -= len;
204        data += len;
205    }
206
207    return false;
208}
209
210int
211hsplit(const EthPacketPtr &ptr)
212{
213    int split_point = 0;
214
215    IpPtr ip(ptr);
216    if (ip) {
217        split_point = ip.pstart();
218
219        TcpPtr tcp(ip);
220        if (tcp)
221            split_point = tcp.pstart();
222
223        UdpPtr udp(ip);
224        if (udp)
225            split_point = udp.pstart();
226    }
227    return split_point;
228}
229
230
231/* namespace Net */ }
232