1 /* in_pcb.c 4.35 82/10/30 */ 2 3 #include "../h/param.h" 4 #include "../h/systm.h" 5 #include "../h/dir.h" 6 #include "../h/user.h" 7 #include "../h/mbuf.h" 8 #include "../h/socket.h" 9 #include "../h/socketvar.h" 10 #include "../netinet/in.h" 11 #include "../netinet/in_systm.h" 12 #include "../net/if.h" 13 #include "../net/route.h" 14 #include "../netinet/in_pcb.h" 15 #include "../h/protosw.h" 16 17 struct in_addr zeroin_addr; 18 19 in_pcbreserve(so, sndcc, rcvcc) 20 struct socket *so; 21 int sndcc, rcvcc; 22 { 23 24 if (sbreserve(&so->so_snd, sndcc) == 0) 25 goto bad; 26 if (sbreserve(&so->so_rcv, rcvcc) == 0) 27 goto bad2; 28 return (0); 29 bad2: 30 sbrelease(&so->so_snd); 31 bad: 32 return (ENOBUFS); 33 } 34 35 in_pcballoc(so, head) 36 struct socket *so; 37 struct inpcb *head; 38 { 39 struct mbuf *m; 40 register struct inpcb *inp; 41 42 m = m_getclr(M_DONTWAIT); 43 if (m == 0) 44 return (ENOBUFS); 45 inp = mtod(m, struct inpcb *); 46 inp->inp_head = head; 47 inp->inp_socket = so; 48 insque(inp, head); 49 so->so_pcb = (caddr_t)inp; 50 return (0); 51 } 52 53 in_pcbbind(inp, nam) 54 register struct inpcb *inp; 55 struct mbuf *nam; 56 { 57 register struct socket *so = inp->inp_socket; 58 register struct inpcb *head = inp->inp_head; 59 register struct sockaddr_in *sin; 60 u_short lport = 0; 61 62 if (ifnet == 0) 63 return (EADDRNOTAVAIL); 64 if (inp->inp_lport || inp->inp_laddr.s_addr) 65 return (EINVAL); 66 if (nam == 0) 67 goto noname; 68 sin = mtod(nam, struct sockaddr_in *); 69 if (nam->m_len != sizeof (*sin)) 70 return (EINVAL); 71 if (sin->sin_addr.s_addr) { 72 int tport = sin->sin_port; 73 74 sin->sin_port = 0; /* yech... */ 75 if (if_ifwithaddr((struct sockaddr *)sin) == 0) 76 return (EADDRNOTAVAIL); 77 sin->sin_port = tport; 78 } 79 lport = sin->sin_port; 80 if (lport) { 81 u_short aport = htons(lport); 82 int wild = 0; 83 84 /* GROSS */ 85 if (aport < IPPORT_RESERVED && u.u_uid != 0) 86 return (EACCES); 87 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0) 88 wild = INPLOOKUP_WILDCARD; 89 if (in_pcblookup(head, 90 zeroin_addr, 0, sin->sin_addr, lport, wild)) 91 return (EADDRINUSE); 92 } 93 inp->inp_laddr = sin->sin_addr; 94 noname: 95 if (lport == 0) 96 do { 97 if (head->inp_lport++ < IPPORT_RESERVED) 98 head->inp_lport = IPPORT_RESERVED; 99 lport = htons(head->inp_lport); 100 } while (in_pcblookup(head, 101 zeroin_addr, 0, inp->inp_laddr, lport, 0)); 102 inp->inp_lport = lport; 103 return (0); 104 } 105 106 /* 107 * Connect from a socket to a specified address. 108 * Both address and port must be specified in argument sin. 109 * If don't have a local address for this socket yet, 110 * then pick one. 111 */ 112 in_pcbconnect(inp, nam) 113 struct inpcb *inp; 114 struct mbuf *nam; 115 { 116 struct ifnet *ifp; 117 struct sockaddr_in *ifaddr; 118 register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 119 120 if (nam->m_len != sizeof (*sin)) 121 return (EINVAL); 122 if (sin->sin_family != AF_INET) 123 return (EAFNOSUPPORT); 124 if (sin->sin_addr.s_addr == 0 || sin->sin_port == 0) 125 return (EADDRNOTAVAIL); 126 if (inp->inp_laddr.s_addr == 0) { 127 ifp = if_ifonnetof(in_netof(sin->sin_addr)); 128 if (ifp == 0) { 129 /* 130 * We should select the interface based on 131 * the route to be used, but for udp this would 132 * result in two calls to rtalloc for each packet 133 * sent; hardly worthwhile... 134 */ 135 ifp = if_ifwithaf(AF_INET); 136 if (ifp == 0) 137 return (EADDRNOTAVAIL); 138 } 139 ifaddr = (struct sockaddr_in *)&ifp->if_addr; 140 } 141 if (in_pcblookup(inp->inp_head, 142 sin->sin_addr, 143 sin->sin_port, 144 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 145 inp->inp_lport, 146 0)) 147 return (EADDRINUSE); 148 if (inp->inp_laddr.s_addr == 0) 149 inp->inp_laddr = ifaddr->sin_addr; 150 inp->inp_faddr = sin->sin_addr; 151 inp->inp_fport = sin->sin_port; 152 return (0); 153 } 154 155 in_pcbdisconnect(inp) 156 struct inpcb *inp; 157 { 158 159 inp->inp_faddr.s_addr = 0; 160 inp->inp_fport = 0; 161 if (inp->inp_socket->so_state & SS_NOFDREF) 162 in_pcbdetach(inp); 163 } 164 165 in_pcbdetach(inp) 166 struct inpcb *inp; 167 { 168 struct socket *so = inp->inp_socket; 169 170 so->so_pcb = 0; 171 sofree(so); 172 if (inp->inp_route.ro_rt) 173 rtfree(inp->inp_route.ro_rt); 174 remque(inp); 175 (void) m_free(dtom(inp)); 176 } 177 178 in_setsockaddr(inp, nam) 179 register struct inpcb *inp; 180 struct mbuf *nam; 181 { 182 register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 183 184 nam->m_len = sizeof (*sin); 185 sin = mtod(nam, struct sockaddr_in *); 186 bzero((caddr_t)sin, sizeof (*sin)); 187 sin->sin_family = AF_INET; 188 sin->sin_port = inp->inp_lport; 189 sin->sin_addr = inp->inp_laddr; 190 } 191 192 /* 193 * Pass an error to all internet connections 194 * associated with address sin. Call the 195 * protocol specific routine to clean up the 196 * mess afterwards. 197 */ 198 in_pcbnotify(head, dst, errno, abort) 199 struct inpcb *head; 200 register struct in_addr *dst; 201 int errno, (*abort)(); 202 { 203 register struct inpcb *inp, *oinp; 204 int s = splimp(); 205 206 for (inp = head->inp_next; inp != head;) { 207 if (inp->inp_faddr.s_addr != dst->s_addr) { 208 next: 209 inp = inp->inp_next; 210 continue; 211 } 212 if (inp->inp_socket == 0) 213 goto next; 214 inp->inp_socket->so_error = errno; 215 oinp = inp; 216 inp = inp->inp_next; 217 (*abort)(oinp); 218 } 219 splx(s); 220 } 221 222 struct inpcb * 223 in_pcblookup(head, faddr, fport, laddr, lport, flags) 224 struct inpcb *head; 225 struct in_addr faddr, laddr; 226 u_short fport, lport; 227 int flags; 228 { 229 register struct inpcb *inp, *match = 0; 230 int matchwild = 3, wildcard; 231 232 for (inp = head->inp_next; inp != head; inp = inp->inp_next) { 233 if (inp->inp_lport != lport) 234 continue; 235 wildcard = 0; 236 if (inp->inp_laddr.s_addr != 0) { 237 if (laddr.s_addr == 0) 238 wildcard++; 239 else if (inp->inp_laddr.s_addr != laddr.s_addr) 240 continue; 241 } else { 242 if (laddr.s_addr != 0) 243 wildcard++; 244 } 245 if (inp->inp_faddr.s_addr != 0) { 246 if (faddr.s_addr == 0) 247 wildcard++; 248 else if (inp->inp_faddr.s_addr != faddr.s_addr || 249 inp->inp_fport != fport) 250 continue; 251 } else { 252 if (faddr.s_addr != 0) 253 wildcard++; 254 } 255 if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0) 256 continue; 257 if (wildcard < matchwild) { 258 match = inp; 259 matchwild = wildcard; 260 if (matchwild == 0) 261 break; 262 } 263 } 264 return (match); 265 } 266