Commit | Line | Data |
---|---|---|
a3fa431a | 1 | /* udp_usrreq.c 4.45 83/02/16 */ |
1bd53abe BJ |
2 | |
3 | #include "../h/param.h" | |
53a5409e BJ |
4 | #include "../h/dir.h" |
5 | #include "../h/user.h" | |
1bd53abe | 6 | #include "../h/mbuf.h" |
d52566dd | 7 | #include "../h/protosw.h" |
53a5409e BJ |
8 | #include "../h/socket.h" |
9 | #include "../h/socketvar.h" | |
f4d55810 SL |
10 | #include "../h/errno.h" |
11 | ||
72e4f44e | 12 | #include "../net/if.h" |
c124e997 | 13 | #include "../net/route.h" |
f4d55810 SL |
14 | |
15 | #include "../netinet/in.h" | |
bf6ab6ff BJ |
16 | #include "../netinet/in_pcb.h" |
17 | #include "../netinet/in_systm.h" | |
18 | #include "../netinet/ip.h" | |
19 | #include "../netinet/ip_var.h" | |
20 | #include "../netinet/ip_icmp.h" | |
21 | #include "../netinet/udp.h" | |
22 | #include "../netinet/udp_var.h" | |
d52566dd | 23 | |
2b4b57cd BJ |
24 | /* |
25 | * UDP protocol implementation. | |
26 | * Per RFC 768, August, 1980. | |
27 | */ | |
d52566dd BJ |
28 | udp_init() |
29 | { | |
30 | ||
eb44bfb2 | 31 | udb.inp_next = udb.inp_prev = &udb; |
d52566dd | 32 | } |
1bd53abe | 33 | |
eb44bfb2 | 34 | int udpcksum; |
2b4b57cd | 35 | struct sockaddr_in udp_in = { AF_INET }; |
eb44bfb2 | 36 | |
2b4b57cd BJ |
37 | udp_input(m0) |
38 | struct mbuf *m0; | |
1bd53abe | 39 | { |
eb44bfb2 | 40 | register struct udpiphdr *ui; |
53a5409e | 41 | register struct inpcb *inp; |
2b4b57cd | 42 | register struct mbuf *m; |
e199a8a5 | 43 | int len; |
eb44bfb2 | 44 | |
2b4b57cd | 45 | /* |
4aed14e3 | 46 | * Get IP and UDP header together in first mbuf. |
2b4b57cd BJ |
47 | */ |
48 | m = m0; | |
89925e89 BJ |
49 | if ((m->m_off > MMAXOFF || m->m_len < sizeof (struct udpiphdr)) && |
50 | (m = m_pullup(m, sizeof (struct udpiphdr))) == 0) { | |
2b4b57cd | 51 | udpstat.udps_hdrops++; |
89925e89 | 52 | return; |
2b4b57cd | 53 | } |
4e60622a | 54 | ui = mtod(m, struct udpiphdr *); |
4aed14e3 | 55 | if (((struct ip *)ui)->ip_hl > (sizeof (struct ip) >> 2)) |
cca1853f | 56 | ip_stripoptions((struct ip *)ui, (struct mbuf *)0); |
2b4b57cd BJ |
57 | |
58 | /* | |
4aed14e3 BJ |
59 | * Make mbuf data length reflect UDP length. |
60 | * If not enough data to reflect UDP length, drop. | |
2b4b57cd | 61 | */ |
e199a8a5 | 62 | len = ntohs((u_short)ui->ui_ulen); |
2b4b57cd BJ |
63 | if (((struct ip *)ui)->ip_len != len) { |
64 | if (len > ((struct ip *)ui)->ip_len) { | |
65 | udpstat.udps_badlen++; | |
66 | goto bad; | |
67 | } | |
68 | m_adj(m, ((struct ip *)ui)->ip_len - len); | |
69 | /* (struct ip *)ui->ip_len = len; */ | |
70 | } | |
71 | ||
72 | /* | |
4aed14e3 | 73 | * Checksum extended UDP header and data. |
2b4b57cd | 74 | */ |
eb44bfb2 | 75 | if (udpcksum) { |
2b4b57cd BJ |
76 | ui->ui_next = ui->ui_prev = 0; |
77 | ui->ui_x1 = 0; | |
e199a8a5 BJ |
78 | ui->ui_len = htons((u_short)len); |
79 | if (ui->ui_sum = in_cksum(m, len + sizeof (struct ip))) { | |
2b4b57cd | 80 | udpstat.udps_badsum++; |
eb44bfb2 BJ |
81 | printf("udp cksum %x\n", ui->ui_sum); |
82 | m_freem(m); | |
83 | return; | |
84 | } | |
85 | } | |
2b4b57cd BJ |
86 | |
87 | /* | |
e199a8a5 | 88 | * Locate pcb for datagram. |
2b4b57cd | 89 | */ |
2b4b57cd | 90 | inp = in_pcblookup(&udb, |
ebcadd38 BJ |
91 | ui->ui_src, ui->ui_sport, ui->ui_dst, ui->ui_dport, |
92 | INPLOOKUP_WILDCARD); | |
72e4f44e | 93 | if (inp == 0) { |
5cdc4d65 SL |
94 | /* don't send ICMP response for broadcast packet */ |
95 | if (in_lnaof(ui->ui_dst) == INADDR_ANY) | |
72e4f44e SL |
96 | goto bad; |
97 | icmp_error((struct ip *)ui, ICMP_UNREACH, ICMP_UNREACH_PORT); | |
98 | return; | |
99 | } | |
2b4b57cd BJ |
100 | |
101 | /* | |
102 | * Construct sockaddr format source address. | |
103 | * Stuff source address and datagram in user buffer. | |
104 | */ | |
105 | udp_in.sin_port = ui->ui_sport; | |
106 | udp_in.sin_addr = ui->ui_src; | |
4e60622a BJ |
107 | m->m_len -= sizeof (struct udpiphdr); |
108 | m->m_off += sizeof (struct udpiphdr); | |
109 | if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in, m) == 0) | |
2b4b57cd | 110 | goto bad; |
4e60622a | 111 | sorwakeup(inp->inp_socket); |
53a5409e | 112 | return; |
2b4b57cd | 113 | bad: |
53a5409e | 114 | m_freem(m); |
1bd53abe BJ |
115 | } |
116 | ||
72e4f44e SL |
117 | udp_abort(inp) |
118 | struct inpcb *inp; | |
119 | { | |
120 | struct socket *so = inp->inp_socket; | |
121 | ||
122 | in_pcbdisconnect(inp); | |
123 | soisdisconnected(so); | |
1bd53abe BJ |
124 | } |
125 | ||
39674d5f SL |
126 | udp_ctlinput(cmd, arg) |
127 | int cmd; | |
128 | caddr_t arg; | |
129 | { | |
130 | struct in_addr *sin; | |
131 | extern u_char inetctlerrmap[]; | |
39674d5f SL |
132 | |
133 | if (cmd < 0 || cmd > PRC_NCMDS) | |
134 | return; | |
135 | switch (cmd) { | |
136 | ||
137 | case PRC_ROUTEDEAD: | |
138 | break; | |
139 | ||
140 | case PRC_QUENCH: | |
141 | break; | |
142 | ||
143 | /* these are handled by ip */ | |
144 | case PRC_IFDOWN: | |
145 | case PRC_HOSTDEAD: | |
146 | case PRC_HOSTUNREACH: | |
147 | break; | |
148 | ||
149 | default: | |
150 | sin = &((struct icmp *)arg)->icmp_ip.ip_dst; | |
a1edc12b | 151 | in_pcbnotify(&udb, sin, (int)inetctlerrmap[cmd], udp_abort); |
39674d5f SL |
152 | } |
153 | } | |
154 | ||
4ad99bae | 155 | udp_output(inp, m0) |
2b4b57cd | 156 | struct inpcb *inp; |
2b4b57cd | 157 | struct mbuf *m0; |
1bd53abe | 158 | { |
2b4b57cd BJ |
159 | register struct mbuf *m; |
160 | register struct udpiphdr *ui; | |
a13c006d | 161 | register struct socket *so; |
2b4b57cd BJ |
162 | register int len = 0; |
163 | ||
164 | /* | |
165 | * Calculate data length and get a mbuf | |
4aed14e3 | 166 | * for UDP and IP headers. |
2b4b57cd BJ |
167 | */ |
168 | for (m = m0; m; m = m->m_next) | |
169 | len += m->m_len; | |
cce93e4b | 170 | m = m_get(M_DONTWAIT, MT_HEADER); |
8a2f82db SL |
171 | if (m == 0) { |
172 | m_freem(m0); | |
173 | return (ENOBUFS); | |
174 | } | |
2b4b57cd BJ |
175 | |
176 | /* | |
4aed14e3 | 177 | * Fill in mbuf with extended UDP header |
2b4b57cd BJ |
178 | * and addresses and length put into network format. |
179 | */ | |
180 | m->m_off = MMAXOFF - sizeof (struct udpiphdr); | |
181 | m->m_len = sizeof (struct udpiphdr); | |
182 | m->m_next = m0; | |
183 | ui = mtod(m, struct udpiphdr *); | |
184 | ui->ui_next = ui->ui_prev = 0; | |
185 | ui->ui_x1 = 0; | |
186 | ui->ui_pr = IPPROTO_UDP; | |
e199a8a5 | 187 | ui->ui_len = len + sizeof (struct udphdr); |
4e60622a BJ |
188 | ui->ui_src = inp->inp_laddr; |
189 | ui->ui_dst = inp->inp_faddr; | |
190 | ui->ui_sport = inp->inp_lport; | |
191 | ui->ui_dport = inp->inp_fport; | |
e199a8a5 | 192 | ui->ui_ulen = htons((u_short)ui->ui_len); |
2b4b57cd BJ |
193 | |
194 | /* | |
195 | * Stuff checksum and output datagram. | |
196 | */ | |
197 | ui->ui_sum = 0; | |
ce605ce8 | 198 | ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len); |
4e60622a BJ |
199 | ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; |
200 | ((struct ip *)ui)->ip_ttl = MAXTTL; | |
a13c006d BJ |
201 | so = inp->inp_socket; |
202 | return (ip_output(m, (struct mbuf *)0, | |
203 | (so->so_options & SO_DONTROUTE) ? &routetoif : (struct route *)0, | |
204 | so->so_state & SS_PRIV)); | |
1bd53abe BJ |
205 | } |
206 | ||
a8d3bf7f | 207 | /*ARGSUSED*/ |
bc031e39 | 208 | udp_usrreq(so, req, m, nam) |
53a5409e | 209 | struct socket *so; |
1bd53abe | 210 | int req; |
8075bb0e | 211 | struct mbuf *m, *nam; |
1bd53abe | 212 | { |
53a5409e | 213 | struct inpcb *inp = sotoinpcb(so); |
8a2f82db | 214 | int error = 0; |
1bd53abe | 215 | |
a3fa431a SL |
216 | if (inp == NULL && req != PRU_ATTACH) { |
217 | error = EINVAL; | |
218 | goto release; | |
219 | } | |
1bd53abe BJ |
220 | switch (req) { |
221 | ||
222 | case PRU_ATTACH: | |
a3fa431a SL |
223 | if (inp != NULL) { |
224 | error = EINVAL; | |
225 | break; | |
226 | } | |
8075bb0e BJ |
227 | error = in_pcballoc(so, &udb); |
228 | if (error) | |
229 | break; | |
59965020 | 230 | error = soreserve(so, 2048, 2048); |
8075bb0e BJ |
231 | if (error) |
232 | break; | |
53a5409e | 233 | break; |
1bd53abe BJ |
234 | |
235 | case PRU_DETACH: | |
a3fa431a SL |
236 | if (inp == NULL) { |
237 | error = ENOTCONN; | |
238 | break; | |
239 | } | |
405c9168 | 240 | in_pcbdetach(inp); |
53a5409e | 241 | break; |
1bd53abe | 242 | |
8075bb0e BJ |
243 | case PRU_BIND: |
244 | error = in_pcbbind(inp, nam); | |
245 | break; | |
246 | ||
247 | case PRU_LISTEN: | |
248 | error = EOPNOTSUPP; | |
249 | break; | |
250 | ||
1bd53abe | 251 | case PRU_CONNECT: |
a3fa431a SL |
252 | if (inp->inp_faddr.s_addr != INADDR_ANY) { |
253 | error = EISCONN; | |
254 | break; | |
255 | } | |
8075bb0e | 256 | error = in_pcbconnect(inp, nam); |
8a2f82db SL |
257 | if (error == 0) |
258 | soisconnected(so); | |
1bd53abe BJ |
259 | break; |
260 | ||
2b4b57cd | 261 | case PRU_ACCEPT: |
a3fa431a SL |
262 | error = EOPNOTSUPP; |
263 | break; | |
2b4b57cd | 264 | |
53a5409e | 265 | case PRU_DISCONNECT: |
a3fa431a SL |
266 | if (inp->inp_faddr.s_addr == INADDR_ANY) { |
267 | error = ENOTCONN; | |
268 | break; | |
269 | } | |
405c9168 | 270 | in_pcbdisconnect(inp); |
53a5409e | 271 | soisdisconnected(so); |
1bd53abe BJ |
272 | break; |
273 | ||
cdad2eb1 BJ |
274 | case PRU_SHUTDOWN: |
275 | socantsendmore(so); | |
276 | break; | |
277 | ||
1aa87517 BJ |
278 | case PRU_SEND: { |
279 | struct in_addr laddr; | |
280 | ||
8075bb0e | 281 | if (nam) { |
1aa87517 | 282 | laddr = inp->inp_laddr; |
a3fa431a SL |
283 | if (inp->inp_faddr.s_addr != INADDR_ANY) { |
284 | error = EISCONN; | |
285 | break; | |
286 | } | |
8075bb0e | 287 | error = in_pcbconnect(inp, nam); |
02bcdb4e | 288 | if (error) |
8a2f82db | 289 | break; |
4ad99bae | 290 | } else { |
a3fa431a SL |
291 | if (inp->inp_faddr.s_addr == INADDR_ANY) { |
292 | error = ENOTCONN; | |
293 | break; | |
294 | } | |
4ad99bae | 295 | } |
8a2f82db | 296 | error = udp_output(inp, m); |
a3fa431a | 297 | m = NULL; |
8075bb0e | 298 | if (nam) { |
405c9168 | 299 | in_pcbdisconnect(inp); |
1aa87517 BJ |
300 | inp->inp_laddr = laddr; |
301 | } | |
302 | } | |
1bd53abe BJ |
303 | break; |
304 | ||
305 | case PRU_ABORT: | |
405c9168 | 306 | in_pcbdetach(inp); |
53a5409e BJ |
307 | sofree(so); |
308 | soisdisconnected(so); | |
1bd53abe BJ |
309 | break; |
310 | ||
311 | case PRU_CONTROL: | |
a3fa431a SL |
312 | error = EOPNOTSUPP; |
313 | break; | |
1bd53abe | 314 | |
126472ab | 315 | case PRU_SOCKADDR: |
8075bb0e | 316 | in_setsockaddr(inp, nam); |
126472ab SL |
317 | break; |
318 | ||
1bd53abe BJ |
319 | default: |
320 | panic("udp_usrreq"); | |
d52566dd | 321 | } |
a3fa431a SL |
322 | release: |
323 | if (m != NULL) | |
324 | m_freem(m); | |
8a2f82db | 325 | return (error); |
d52566dd | 326 | } |