base/inet.cc

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