1 /* in_pcb.c 4.40 83/01/22 */ 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_pcballoc(so, head) 20 struct socket *so; 21 struct inpcb *head; 22 { 23 struct mbuf *m; 24 register struct inpcb *inp; 25 26 m = m_getclr(M_DONTWAIT, MT_PCB); 27 if (m == NULL) 28 return (ENOBUFS); 29 inp = mtod(m, struct inpcb *); 30 inp->inp_head = head; 31 inp->inp_socket = so; 32 insque(inp, head); 33 so->so_pcb = (caddr_t)inp; 34 return (0); 35 } 36 37 in_pcbbind(inp, nam) 38 register struct inpcb *inp; 39 struct mbuf *nam; 40 { 41 register struct socket *so = inp->inp_socket; 42 register struct inpcb *head = inp->inp_head; 43 register struct sockaddr_in *sin; 44 u_short lport = 0; 45 46 if (ifnet == 0) 47 return (EADDRNOTAVAIL); 48 if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) 49 return (EINVAL); 50 if (nam == 0) 51 goto noname; 52 sin = mtod(nam, struct sockaddr_in *); 53 if (nam->m_len != sizeof (*sin)) 54 return (EINVAL); 55 if (sin->sin_addr.s_addr != INADDR_ANY) { 56 int tport = sin->sin_port; 57 58 sin->sin_port = 0; /* yech... */ 59 if (if_ifwithaddr((struct sockaddr *)sin) == 0) 60 return (EADDRNOTAVAIL); 61 sin->sin_port = tport; 62 } 63 lport = sin->sin_port; 64 if (lport) { 65 u_short aport = htons(lport); 66 int wild = 0; 67 68 /* GROSS */ 69 if (aport < IPPORT_RESERVED && u.u_uid != 0) 70 return (EACCES); 71 /* even GROSSER, but this is the Internet */ 72 if ((so->so_options & SO_REUSEADDR) == 0 && 73 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 74 (so->so_options & SO_ACCEPTCONN) == 0)) 75 wild = INPLOOKUP_WILDCARD; 76 if (in_pcblookup(head, 77 zeroin_addr, 0, sin->sin_addr, lport, wild)) 78 return (EADDRINUSE); 79 } 80 inp->inp_laddr = sin->sin_addr; 81 noname: 82 if (lport == 0) 83 do { 84 if (head->inp_lport++ < IPPORT_RESERVED) 85 head->inp_lport = IPPORT_RESERVED; 86 lport = htons(head->inp_lport); 87 } while (in_pcblookup(head, 88 zeroin_addr, 0, inp->inp_laddr, lport, 0)); 89 inp->inp_lport = lport; 90 return (0); 91 } 92 93 /* 94 * Connect from a socket to a specified address. 95 * Both address and port must be specified in argument sin. 96 * If don't have a local address for this socket yet, 97 * then pick one. 98 */ 99 in_pcbconnect(inp, nam) 100 struct inpcb *inp; 101 struct mbuf *nam; 102 { 103 struct ifnet *ifp; 104 struct sockaddr_in *ifaddr; 105 register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 106 107 if (nam->m_len != sizeof (*sin)) 108 return (EINVAL); 109 if (sin->sin_family != AF_INET) 110 return (EAFNOSUPPORT); 111 if (sin->sin_addr.s_addr == INADDR_ANY || sin->sin_port == 0) 112 return (EADDRNOTAVAIL); 113 if (inp->inp_laddr.s_addr == INADDR_ANY) { 114 ifp = if_ifonnetof(in_netof(sin->sin_addr)); 115 if (ifp == 0) { 116 /* 117 * We should select the interface based on 118 * the route to be used, but for udp this would 119 * result in two calls to rtalloc for each packet 120 * sent; hardly worthwhile... 121 */ 122 ifp = if_ifwithaf(AF_INET); 123 if (ifp == 0) 124 return (EADDRNOTAVAIL); 125 } 126 ifaddr = (struct sockaddr_in *)&ifp->if_addr; 127 } 128 if (in_pcblookup(inp->inp_head, 129 sin->sin_addr, 130 sin->sin_port, 131 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 132 inp->inp_lport, 133 0)) 134 return (EADDRINUSE); 135 if (inp->inp_laddr.s_addr == INADDR_ANY) 136 inp->inp_laddr = ifaddr->sin_addr; 137 inp->inp_faddr = sin->sin_addr; 138 inp->inp_fport = sin->sin_port; 139 return (0); 140 } 141 142 in_pcbdisconnect(inp) 143 struct inpcb *inp; 144 { 145 146 inp->inp_faddr.s_addr = INADDR_ANY; 147 inp->inp_fport = 0; 148 if (inp->inp_socket->so_state & SS_NOFDREF) 149 in_pcbdetach(inp); 150 } 151 152 in_pcbdetach(inp) 153 struct inpcb *inp; 154 { 155 struct socket *so = inp->inp_socket; 156 157 so->so_pcb = 0; 158 sofree(so); 159 if (inp->inp_route.ro_rt) 160 rtfree(inp->inp_route.ro_rt); 161 remque(inp); 162 (void) m_free(dtom(inp)); 163 } 164 165 in_setsockaddr(inp, nam) 166 register struct inpcb *inp; 167 struct mbuf *nam; 168 { 169 register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 170 171 nam->m_len = sizeof (*sin); 172 sin = mtod(nam, struct sockaddr_in *); 173 bzero((caddr_t)sin, sizeof (*sin)); 174 sin->sin_family = AF_INET; 175 sin->sin_port = inp->inp_lport; 176 sin->sin_addr = inp->inp_laddr; 177 } 178 179 /* 180 * Pass an error to all internet connections 181 * associated with address sin. Call the 182 * protocol specific routine to clean up the 183 * mess afterwards. 184 */ 185 in_pcbnotify(head, dst, errno, abort) 186 struct inpcb *head; 187 register struct in_addr *dst; 188 int errno, (*abort)(); 189 { 190 register struct inpcb *inp, *oinp; 191 int s = splimp(); 192 193 for (inp = head->inp_next; inp != head;) { 194 if (inp->inp_faddr.s_addr != dst->s_addr) { 195 next: 196 inp = inp->inp_next; 197 continue; 198 } 199 if (inp->inp_socket == 0) 200 goto next; 201 inp->inp_socket->so_error = errno; 202 oinp = inp; 203 inp = inp->inp_next; 204 (*abort)(oinp); 205 } 206 splx(s); 207 } 208 209 struct inpcb * 210 in_pcblookup(head, faddr, fport, laddr, lport, flags) 211 struct inpcb *head; 212 struct in_addr faddr, laddr; 213 u_short fport, lport; 214 int flags; 215 { 216 register struct inpcb *inp, *match = 0; 217 int matchwild = 3, wildcard; 218 219 for (inp = head->inp_next; inp != head; inp = inp->inp_next) { 220 if (inp->inp_lport != lport) 221 continue; 222 wildcard = 0; 223 if (inp->inp_laddr.s_addr != INADDR_ANY) { 224 if (laddr.s_addr == INADDR_ANY) 225 wildcard++; 226 else if (inp->inp_laddr.s_addr != laddr.s_addr) 227 continue; 228 } else { 229 if (laddr.s_addr != INADDR_ANY) 230 wildcard++; 231 } 232 if (inp->inp_faddr.s_addr != INADDR_ANY) { 233 if (faddr.s_addr == INADDR_ANY) 234 wildcard++; 235 else if (inp->inp_faddr.s_addr != faddr.s_addr || 236 inp->inp_fport != fport) 237 continue; 238 } else { 239 if (faddr.s_addr != INADDR_ANY) 240 wildcard++; 241 } 242 if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0) 243 continue; 244 if (wildcard < matchwild) { 245 match = inp; 246 matchwild = wildcard; 247 if (matchwild == 0) 248 break; 249 } 250 } 251 return (match); 252 } 253