inet.cc revision 2665:a124942bacb8 
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 <sstream>
32#include <string>
33
34#include "base/cprintf.hh"
35#include "sim/host.hh"
36#include "base/inet.hh"
37
38using namespace std;
39namespace Net {
40
41EthAddr::EthAddr()
42{
43    memset(data, 0, ETH_ADDR_LEN);
44}
45
46EthAddr::EthAddr(const uint8_t ea[ETH_ADDR_LEN])
47{
48    *data = *ea;
49}
50
51EthAddr::EthAddr(const eth_addr &ea)
52{
53    *data = *ea.data;
54}
55
56EthAddr::EthAddr(const std::string &addr)
57{
58    parse(addr);
59}
60
61const EthAddr &
62EthAddr::operator=(const eth_addr &ea)
63{
64    *data = *ea.data;
65    return *this;
66}
67
68const EthAddr &
69EthAddr::operator=(const std::string &addr)
70{
71    parse(addr);
72    return *this;
73}
74
75void
76EthAddr::parse(const std::string &addr)
77{
78    // the hack below is to make sure that ETH_ADDR_LEN is 6 otherwise
79    // the sscanf function won't work.
80    int bytes[ETH_ADDR_LEN == 6 ? ETH_ADDR_LEN : -1];
81    if (sscanf(addr.c_str(), "%x:%x:%x:%x:%x:%x", &bytes[0], &bytes[1],
82               &bytes[2], &bytes[3], &bytes[4], &bytes[5]) != ETH_ADDR_LEN) {
83        memset(data, 0xff, ETH_ADDR_LEN);
84        return;
85    }
86
87    for (int i = 0; i < ETH_ADDR_LEN; ++i) {
88        if (bytes[i] & ~0xff) {
89            memset(data, 0xff, ETH_ADDR_LEN);
90            return;
91        }
92
93        data[i] = bytes[i];
94    }
95}
96
97string
98EthAddr::string() const
99{
100    stringstream stream;
101    stream << *this;
102    return stream.str();
103}
104
105bool
106operator==(const EthAddr &left, const EthAddr &right)
107{
108    return memcmp(left.bytes(), right.bytes(), ETH_ADDR_LEN);
109}
110
111ostream &
112operator<<(ostream &stream, const EthAddr &ea)
113{
114    const uint8_t *a = ea.addr();
115    ccprintf(stream, "%x:%x:%x:%x:%x:%x", a[0], a[1], a[2], a[3], a[4], a[5]);
116    return stream;
117}
118
119uint16_t
120cksum(const IpPtr &ptr)
121{
122    int sum = ip_cksum_add(ptr->bytes(), ptr->hlen(), 0);
123    return ip_cksum_carry(sum);
124}
125
126uint16_t
127__tu_cksum(const IpPtr &ip)
128{
129    int tcplen = ip->len() - ip->hlen();
130    int sum = ip_cksum_add(ip->payload(), tcplen, 0);
131    sum = ip_cksum_add(&ip->ip_src, 8, sum); // source and destination
132    sum += htons(ip->ip_p + tcplen);
133    return ip_cksum_carry(sum);
134}
135
136uint16_t
137cksum(const TcpPtr &tcp)
138{ return __tu_cksum(IpPtr(tcp.packet())); }
139
140uint16_t
141cksum(const UdpPtr &udp)
142{ return __tu_cksum(IpPtr(udp.packet())); }
143
144bool
145IpHdr::options(vector<const IpOpt *> &vec) const
146{
147    vec.clear();
148
149    const uint8_t *data = bytes() + sizeof(struct ip_hdr);
150    int all = hlen() - sizeof(struct ip_hdr);
151    while (all > 0) {
152        const IpOpt *opt = (const IpOpt *)data;
153        int len = opt->len();
154        if (all < len)
155            return false;
156
157        vec.push_back(opt);
158        all -= len;
159        data += len;
160    }
161
162    return true;
163}
164
165bool
166TcpHdr::options(vector<const TcpOpt *> &vec) const
167{
168    vec.clear();
169
170    const uint8_t *data = bytes() + sizeof(struct tcp_hdr);
171    int all = off() - sizeof(struct tcp_hdr);
172    while (all > 0) {
173        const TcpOpt *opt = (const TcpOpt *)data;
174        int len = opt->len();
175        if (all < len)
176            return false;
177
178        vec.push_back(opt);
179        all -= len;
180        data += len;
181    }
182
183    return true;
184}
185
186bool
187TcpOpt::sack(vector<SackRange> &vec) const
188{
189    vec.clear();
190
191    const uint8_t *data = bytes() + sizeof(struct tcp_hdr);
192    int all = len() - offsetof(tcp_opt, opt_data.sack);
193    while (all > 0) {
194        const uint16_t *sack = (const uint16_t *)data;
195        int len = sizeof(uint16_t) * 2;
196        if (all < len) {
197            vec.clear();
198            return false;
199        }
200
201        vec.push_back(RangeIn(ntohs(sack[0]), ntohs(sack[1])));
202        all -= len;
203        data += len;
204    }
205
206    return false;
207}
208
209/* namespace Net */ }
210