1 /* udp_usrreq.c 4.13 81/12/02 */ 2 3 #include "../h/param.h" 4 #include "../h/dir.h" 5 #include "../h/user.h" 6 #include "../h/mbuf.h" 7 #include "../h/protosw.h" 8 #include "../h/socket.h" 9 #include "../h/socketvar.h" 10 #include "../net/in.h" 11 #include "../net/in_pcb.h" 12 #include "../net/in_systm.h" 13 #include "../net/ip.h" 14 #include "../net/ip_var.h" 15 #include "../net/udp.h" 16 #include "../net/udp_var.h" 17 18 /* 19 * UDP protocol implementation. 20 * Per RFC 768, August, 1980. 21 */ 22 udp_init() 23 { 24 25 COUNT(UDP_INIT); 26 udb.inp_next = udb.inp_prev = &udb; 27 } 28 29 int udpcksum; 30 struct sockaddr_in udp_in = { AF_INET }; 31 32 udp_input(m0) 33 struct mbuf *m0; 34 { 35 register struct udpiphdr *ui; 36 register struct inpcb *inp; 37 register struct mbuf *m; 38 int len, ulen; 39 40 COUNT(UDP_INPUT); 41 /* 42 * Get ip and udp header together in first mbuf. 43 */ 44 m = m0; 45 if (m->m_len < sizeof (struct udpiphdr) && 46 m_pullup(m, sizeof (struct udpiphdr)) == 0) { 47 udpstat.udps_hdrops++; 48 goto bad; 49 } 50 ui = mtod(m, struct udpiphdr *); 51 if (ui->ui_len > sizeof (struct ip)) 52 ip_stripoptions((struct ip *)ui, (char *)0); 53 54 /* 55 * Make mbuf data length reflect udp length. 56 * If not enough data to reflect udp length, drop. 57 */ 58 ulen = ntohs((u_short)ui->ui_ulen); 59 len = sizeof (struct udpiphdr) + ulen; 60 if (((struct ip *)ui)->ip_len != len) { 61 if (len > ((struct ip *)ui)->ip_len) { 62 udpstat.udps_badlen++; 63 goto bad; 64 } 65 m_adj(m, ((struct ip *)ui)->ip_len - len); 66 /* (struct ip *)ui->ip_len = len; */ 67 } 68 69 /* 70 * Checksum extended udp header and data. 71 */ 72 if (udpcksum) { 73 ui->ui_next = ui->ui_prev = 0; 74 ui->ui_x1 = 0; 75 ui->ui_len = htons((u_short)(sizeof (struct udpiphdr) + ulen)); 76 if ((ui->ui_sum = in_cksum(m, len)) != 0xffff) { 77 udpstat.udps_badsum++; 78 printf("udp cksum %x\n", ui->ui_sum); 79 m_freem(m); 80 return; 81 } 82 } 83 84 /* 85 * Convert addresses and ports to host format. 86 * Locate pcb for datagram. 87 */ 88 inp = in_pcblookup(&udb, 89 ui->ui_src, ui->ui_sport, ui->ui_dst, ui->ui_dport); 90 if (inp == 0) 91 goto bad; 92 93 /* 94 * Construct sockaddr format source address. 95 * Stuff source address and datagram in user buffer. 96 */ 97 udp_in.sin_port = ui->ui_sport; 98 udp_in.sin_addr = ui->ui_src; 99 m->m_len -= sizeof (struct udpiphdr); 100 m->m_off += sizeof (struct udpiphdr); 101 if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in, m) == 0) 102 goto bad; 103 sorwakeup(inp->inp_socket); 104 return; 105 bad: 106 m_freem(m); 107 } 108 109 udp_ctlinput(m) 110 struct mbuf *m; 111 { 112 113 COUNT(UDP_CTLINPUT); 114 printf("udp_ctlinput\n"); 115 m_freem(m); 116 } 117 118 /*ARGSUSED*/ 119 udp_output(inp, m0) 120 struct inpcb *inp; 121 struct mbuf *m0; 122 { 123 register struct mbuf *m; 124 register struct udpiphdr *ui; 125 register int len = 0; 126 127 COUNT(UDP_OUTPUT); 128 /* 129 * Calculate data length and get a mbuf 130 * for udp and ip headers. 131 */ 132 for (m = m0; m; m = m->m_next) 133 len += m->m_len; 134 m = m_get(0); 135 if (m == 0) 136 goto bad; 137 138 /* 139 * Fill in mbuf with extended udp header 140 * and addresses and length put into network format. 141 */ 142 m->m_off = MMAXOFF - sizeof (struct udpiphdr); 143 m->m_len = sizeof (struct udpiphdr); 144 m->m_next = m0; 145 ui = mtod(m, struct udpiphdr *); 146 ui->ui_next = ui->ui_prev = 0; 147 ui->ui_x1 = 0; 148 ui->ui_pr = IPPROTO_UDP; 149 ui->ui_len = sizeof (struct udpiphdr) + len; 150 ui->ui_src = inp->inp_laddr; 151 ui->ui_dst = inp->inp_faddr; 152 ui->ui_sport = inp->inp_lport; 153 ui->ui_dport = inp->inp_fport; 154 ui->ui_ulen = htons((u_short)len); 155 156 /* 157 * Stuff checksum and output datagram. 158 */ 159 ui->ui_sum = 0; 160 ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len); 161 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 162 ((struct ip *)ui)->ip_ttl = MAXTTL; 163 (void) ip_output(m, (struct mbuf *)0); 164 return; 165 bad: 166 m_freem(m); 167 } 168 169 /*ARGSUSED*/ 170 udp_usrreq(so, req, m, addr) 171 struct socket *so; 172 int req; 173 struct mbuf *m; 174 caddr_t addr; 175 { 176 struct inpcb *inp = sotoinpcb(so); 177 int error; 178 179 COUNT(UDP_USRREQ); 180 if (inp == 0 && req != PRU_ATTACH) 181 return (EINVAL); 182 switch (req) { 183 184 case PRU_ATTACH: 185 if (inp != 0) 186 return (EINVAL); 187 error = in_pcbattach(so, &udb, 2048, 2048, (struct sockaddr_in *)addr); 188 if (error) 189 return (error); 190 break; 191 192 case PRU_DETACH: 193 if (inp == 0) 194 return (ENOTCONN); 195 in_pcbdetach(inp); 196 break; 197 198 case PRU_CONNECT: 199 if (inp->inp_faddr.s_addr) 200 return (EISCONN); 201 error = in_pcbconnect(inp, (struct sockaddr_in *)addr); 202 if (error) 203 return (error); 204 soisconnected(so); 205 break; 206 207 case PRU_ACCEPT: 208 return (EOPNOTSUPP); 209 210 case PRU_DISCONNECT: 211 if (inp->inp_faddr.s_addr == 0) 212 return (ENOTCONN); 213 in_pcbdisconnect(inp); 214 soisdisconnected(so); 215 break; 216 217 case PRU_SHUTDOWN: 218 socantsendmore(so); 219 break; 220 221 case PRU_SEND: 222 if (addr) { 223 if (inp->inp_faddr.s_addr) 224 return (EISCONN); 225 error = in_pcbconnect(inp, (struct sockaddr_in *)addr); 226 if (error) 227 return (error); 228 } else { 229 if (inp->inp_faddr.s_addr == 0) 230 return (ENOTCONN); 231 } 232 udp_output(inp, m); 233 if (addr) 234 in_pcbdisconnect(inp); 235 break; 236 237 case PRU_ABORT: 238 in_pcbdetach(inp); 239 sofree(so); 240 soisdisconnected(so); 241 break; 242 243 case PRU_CONTROL: 244 return (EOPNOTSUPP); 245 246 default: 247 panic("udp_usrreq"); 248 } 249 return (0); 250 } 251 252 /*ARGSUSED*/ 253 udp_sense(m) 254 struct mbuf *m; 255 { 256 257 COUNT(UDP_SENSE); 258 printf("udp_sense\n"); 259 return (EOPNOTSUPP); 260 } 261