1 /* udp_usrreq.c 4.30 82/06/20 */ 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/if.h" 12 #include "../net/route.h" 13 #include "../net/in_pcb.h" 14 #include "../net/in_systm.h" 15 #include "../net/ip.h" 16 #include "../net/ip_var.h" 17 #include "../net/ip_icmp.h" 18 #include "../net/udp.h" 19 #include "../net/udp_var.h" 20 #include <errno.h> 21 22 /* 23 * UDP protocol implementation. 24 * Per RFC 768, August, 1980. 25 */ 26 udp_init() 27 { 28 29 udb.inp_next = udb.inp_prev = &udb; 30 } 31 32 int udpcksum; 33 struct sockaddr_in udp_in = { AF_INET }; 34 35 udp_input(m0) 36 struct mbuf *m0; 37 { 38 register struct udpiphdr *ui; 39 register struct inpcb *inp; 40 register struct mbuf *m; 41 int len, ulen; 42 43 /* 44 * Get IP and UDP header together in first mbuf. 45 */ 46 m = m0; 47 if ((m->m_off > MMAXOFF || m->m_len < sizeof (struct udpiphdr)) && 48 (m = m_pullup(m, sizeof (struct udpiphdr))) == 0) { 49 udpstat.udps_hdrops++; 50 return; 51 } 52 ui = mtod(m, struct udpiphdr *); 53 if (((struct ip *)ui)->ip_hl > (sizeof (struct ip) >> 2)) 54 ip_stripoptions((struct ip *)ui, (struct mbuf *)0); 55 56 /* 57 * Make mbuf data length reflect UDP length. 58 * If not enough data to reflect UDP length, drop. 59 */ 60 ulen = ntohs((u_short)ui->ui_ulen); 61 len = sizeof (struct udphdr) + ulen; 62 if (((struct ip *)ui)->ip_len != len) { 63 if (len > ((struct ip *)ui)->ip_len) { 64 udpstat.udps_badlen++; 65 goto bad; 66 } 67 m_adj(m, ((struct ip *)ui)->ip_len - len); 68 /* (struct ip *)ui->ip_len = len; */ 69 } 70 71 /* 72 * Checksum extended UDP header and data. 73 */ 74 if (udpcksum) { 75 ui->ui_next = ui->ui_prev = 0; 76 ui->ui_x1 = 0; 77 ui->ui_len = htons((u_short)(sizeof (struct udphdr) + ulen)); 78 if (ui->ui_sum = in_cksum(m, len)) { 79 udpstat.udps_badsum++; 80 printf("udp cksum %x\n", ui->ui_sum); 81 m_freem(m); 82 return; 83 } 84 } 85 86 /* 87 * Locate pcb for datagram. On wildcard match, update 88 * control block to anchor network and host address. 89 */ 90 inp = in_pcblookup(&udb, 91 ui->ui_src, ui->ui_sport, ui->ui_dst, ui->ui_dport, 92 INPLOOKUP_WILDCARD); 93 if (inp == 0) { 94 struct in_addr broadcastaddr; 95 96 broadcastaddr = if_makeaddr(ui->ui_dst.s_net, INADDR_ANY); 97 if (ui->ui_dst.s_addr == broadcastaddr.s_addr) 98 goto bad; 99 icmp_error((struct ip *)ui, ICMP_UNREACH, ICMP_UNREACH_PORT); 100 return; 101 } 102 103 /* 104 * Construct sockaddr format source address. 105 * Stuff source address and datagram in user buffer. 106 */ 107 udp_in.sin_port = ui->ui_sport; 108 udp_in.sin_addr = ui->ui_src; 109 m->m_len -= sizeof (struct udpiphdr); 110 m->m_off += sizeof (struct udpiphdr); 111 if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in, m) == 0) 112 goto bad; 113 sorwakeup(inp->inp_socket); 114 return; 115 bad: 116 m_freem(m); 117 } 118 119 udp_abort(inp) 120 struct inpcb *inp; 121 { 122 struct socket *so = inp->inp_socket; 123 124 in_pcbdisconnect(inp); 125 soisdisconnected(so); 126 } 127 128 udp_ctlinput(cmd, arg) 129 int cmd; 130 caddr_t arg; 131 { 132 struct in_addr *sin; 133 extern u_char inetctlerrmap[]; 134 135 if (cmd < 0 || cmd > PRC_NCMDS) 136 return; 137 switch (cmd) { 138 139 case PRC_ROUTEDEAD: 140 break; 141 142 case PRC_QUENCH: 143 break; 144 145 /* these are handled by ip */ 146 case PRC_IFDOWN: 147 case PRC_HOSTDEAD: 148 case PRC_HOSTUNREACH: 149 break; 150 151 default: 152 sin = &((struct icmp *)arg)->icmp_ip.ip_dst; 153 in_pcbnotify(&udb, sin, inetctlerrmap[cmd], udp_abort); 154 } 155 } 156 157 udp_output(inp, m0) 158 struct inpcb *inp; 159 struct mbuf *m0; 160 { 161 register struct mbuf *m; 162 register struct udpiphdr *ui; 163 register struct socket *so; 164 register int len = 0; 165 166 /* 167 * Calculate data length and get a mbuf 168 * for UDP and IP headers. 169 */ 170 for (m = m0; m; m = m->m_next) 171 len += m->m_len; 172 m = m_get(M_DONTWAIT); 173 if (m == 0) { 174 m_freem(m0); 175 return (ENOBUFS); 176 } 177 178 /* 179 * Fill in mbuf with extended UDP header 180 * and addresses and length put into network format. 181 */ 182 m->m_off = MMAXOFF - sizeof (struct udpiphdr); 183 m->m_len = sizeof (struct udpiphdr); 184 m->m_next = m0; 185 ui = mtod(m, struct udpiphdr *); 186 ui->ui_next = ui->ui_prev = 0; 187 ui->ui_x1 = 0; 188 ui->ui_pr = IPPROTO_UDP; 189 ui->ui_len = sizeof (struct udpiphdr) + len; 190 ui->ui_src = inp->inp_laddr; 191 ui->ui_dst = inp->inp_faddr; 192 ui->ui_sport = inp->inp_lport; 193 ui->ui_dport = inp->inp_fport; 194 ui->ui_ulen = len; 195 #if vax 196 ui->ui_ulen = htons(ui->ui_ulen); 197 #endif 198 199 /* 200 * Stuff checksum and output datagram. 201 */ 202 ui->ui_sum = 0; 203 ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len); 204 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 205 ((struct ip *)ui)->ip_ttl = MAXTTL; 206 so = inp->inp_socket; 207 return (ip_output(m, (struct mbuf *)0, 208 (so->so_options & SO_DONTROUTE) ? &routetoif : (struct route *)0, 209 so->so_state & SS_PRIV)); 210 } 211 212 udp_usrreq(so, req, m, addr) 213 struct socket *so; 214 int req; 215 struct mbuf *m; 216 caddr_t addr; 217 { 218 struct inpcb *inp = sotoinpcb(so); 219 int error = 0; 220 221 if (inp == 0 && req != PRU_ATTACH) 222 return (EINVAL); 223 switch (req) { 224 225 case PRU_ATTACH: 226 if (inp != 0) 227 return (EINVAL); 228 error = in_pcbattach(so, &udb, 2048, 2048, 229 (struct sockaddr_in *)addr); 230 break; 231 232 case PRU_DETACH: 233 if (inp == 0) 234 return (ENOTCONN); 235 in_pcbdetach(inp); 236 break; 237 238 case PRU_CONNECT: 239 if (inp->inp_faddr.s_addr) 240 return (EISCONN); 241 error = in_pcbconnect(inp, (struct sockaddr_in *)addr); 242 if (error == 0) 243 soisconnected(so); 244 break; 245 246 case PRU_ACCEPT: 247 return (EOPNOTSUPP); 248 249 case PRU_DISCONNECT: 250 if (inp->inp_faddr.s_addr == 0) 251 return (ENOTCONN); 252 in_pcbdisconnect(inp); 253 soisdisconnected(so); 254 break; 255 256 case PRU_SHUTDOWN: 257 socantsendmore(so); 258 break; 259 260 case PRU_SEND: { 261 struct in_addr laddr; 262 263 if (addr) { 264 laddr = inp->inp_laddr; 265 if (inp->inp_faddr.s_addr) 266 return (EISCONN); 267 error = in_pcbconnect(inp, (struct sockaddr_in *)addr); 268 if (error) 269 break; 270 } else { 271 if (inp->inp_faddr.s_addr == 0) 272 return (ENOTCONN); 273 } 274 error = udp_output(inp, m); 275 if (addr) { 276 in_pcbdisconnect(inp); 277 inp->inp_laddr = laddr; 278 } 279 } 280 break; 281 282 case PRU_ABORT: 283 in_pcbdetach(inp); 284 sofree(so); 285 soisdisconnected(so); 286 break; 287 288 case PRU_CONTROL: 289 return (EOPNOTSUPP); 290 291 case PRU_SOCKADDR: 292 in_setsockaddr((struct sockaddr_in *)addr, inp); 293 break; 294 295 default: 296 panic("udp_usrreq"); 297 } 298 return (error); 299 } 300