Commit | Line | Data |
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5cdc4d65 | 1 | /* udp_usrreq.c 4.42 83/01/04 */ |
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" | |
bf6ab6ff | 10 | #include "../netinet/in.h" |
72e4f44e | 11 | #include "../net/if.h" |
c124e997 | 12 | #include "../net/route.h" |
bf6ab6ff BJ |
13 | #include "../netinet/in_pcb.h" |
14 | #include "../netinet/in_systm.h" | |
15 | #include "../netinet/ip.h" | |
16 | #include "../netinet/ip_var.h" | |
17 | #include "../netinet/ip_icmp.h" | |
18 | #include "../netinet/udp.h" | |
19 | #include "../netinet/udp_var.h" | |
8a2f82db | 20 | #include <errno.h> |
d52566dd | 21 | |
2b4b57cd BJ |
22 | /* |
23 | * UDP protocol implementation. | |
24 | * Per RFC 768, August, 1980. | |
25 | */ | |
d52566dd BJ |
26 | udp_init() |
27 | { | |
28 | ||
eb44bfb2 | 29 | udb.inp_next = udb.inp_prev = &udb; |
d52566dd | 30 | } |
1bd53abe | 31 | |
eb44bfb2 | 32 | int udpcksum; |
2b4b57cd | 33 | struct sockaddr_in udp_in = { AF_INET }; |
eb44bfb2 | 34 | |
2b4b57cd BJ |
35 | udp_input(m0) |
36 | struct mbuf *m0; | |
1bd53abe | 37 | { |
eb44bfb2 | 38 | register struct udpiphdr *ui; |
53a5409e | 39 | register struct inpcb *inp; |
2b4b57cd | 40 | register struct mbuf *m; |
e199a8a5 | 41 | int len; |
eb44bfb2 | 42 | |
2b4b57cd | 43 | /* |
4aed14e3 | 44 | * Get IP and UDP header together in first mbuf. |
2b4b57cd BJ |
45 | */ |
46 | m = m0; | |
89925e89 BJ |
47 | if ((m->m_off > MMAXOFF || m->m_len < sizeof (struct udpiphdr)) && |
48 | (m = m_pullup(m, sizeof (struct udpiphdr))) == 0) { | |
2b4b57cd | 49 | udpstat.udps_hdrops++; |
89925e89 | 50 | return; |
2b4b57cd | 51 | } |
4e60622a | 52 | ui = mtod(m, struct udpiphdr *); |
4aed14e3 | 53 | if (((struct ip *)ui)->ip_hl > (sizeof (struct ip) >> 2)) |
cca1853f | 54 | ip_stripoptions((struct ip *)ui, (struct mbuf *)0); |
2b4b57cd BJ |
55 | |
56 | /* | |
4aed14e3 BJ |
57 | * Make mbuf data length reflect UDP length. |
58 | * If not enough data to reflect UDP length, drop. | |
2b4b57cd | 59 | */ |
e199a8a5 | 60 | len = ntohs((u_short)ui->ui_ulen); |
2b4b57cd BJ |
61 | if (((struct ip *)ui)->ip_len != len) { |
62 | if (len > ((struct ip *)ui)->ip_len) { | |
63 | udpstat.udps_badlen++; | |
64 | goto bad; | |
65 | } | |
66 | m_adj(m, ((struct ip *)ui)->ip_len - len); | |
67 | /* (struct ip *)ui->ip_len = len; */ | |
68 | } | |
69 | ||
70 | /* | |
4aed14e3 | 71 | * Checksum extended UDP header and data. |
2b4b57cd | 72 | */ |
eb44bfb2 | 73 | if (udpcksum) { |
2b4b57cd BJ |
74 | ui->ui_next = ui->ui_prev = 0; |
75 | ui->ui_x1 = 0; | |
e199a8a5 BJ |
76 | ui->ui_len = htons((u_short)len); |
77 | if (ui->ui_sum = in_cksum(m, len + sizeof (struct ip))) { | |
2b4b57cd | 78 | udpstat.udps_badsum++; |
eb44bfb2 BJ |
79 | printf("udp cksum %x\n", ui->ui_sum); |
80 | m_freem(m); | |
81 | return; | |
82 | } | |
83 | } | |
2b4b57cd BJ |
84 | |
85 | /* | |
e199a8a5 | 86 | * Locate pcb for datagram. |
2b4b57cd | 87 | */ |
2b4b57cd | 88 | inp = in_pcblookup(&udb, |
ebcadd38 BJ |
89 | ui->ui_src, ui->ui_sport, ui->ui_dst, ui->ui_dport, |
90 | INPLOOKUP_WILDCARD); | |
72e4f44e | 91 | if (inp == 0) { |
5cdc4d65 SL |
92 | /* don't send ICMP response for broadcast packet */ |
93 | if (in_lnaof(ui->ui_dst) == INADDR_ANY) | |
72e4f44e SL |
94 | goto bad; |
95 | icmp_error((struct ip *)ui, ICMP_UNREACH, ICMP_UNREACH_PORT); | |
96 | return; | |
97 | } | |
2b4b57cd BJ |
98 | |
99 | /* | |
100 | * Construct sockaddr format source address. | |
101 | * Stuff source address and datagram in user buffer. | |
102 | */ | |
103 | udp_in.sin_port = ui->ui_sport; | |
104 | udp_in.sin_addr = ui->ui_src; | |
4e60622a BJ |
105 | m->m_len -= sizeof (struct udpiphdr); |
106 | m->m_off += sizeof (struct udpiphdr); | |
107 | if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in, m) == 0) | |
2b4b57cd | 108 | goto bad; |
4e60622a | 109 | sorwakeup(inp->inp_socket); |
53a5409e | 110 | return; |
2b4b57cd | 111 | bad: |
53a5409e | 112 | m_freem(m); |
1bd53abe BJ |
113 | } |
114 | ||
72e4f44e SL |
115 | udp_abort(inp) |
116 | struct inpcb *inp; | |
117 | { | |
118 | struct socket *so = inp->inp_socket; | |
119 | ||
120 | in_pcbdisconnect(inp); | |
121 | soisdisconnected(so); | |
1bd53abe BJ |
122 | } |
123 | ||
39674d5f SL |
124 | udp_ctlinput(cmd, arg) |
125 | int cmd; | |
126 | caddr_t arg; | |
127 | { | |
128 | struct in_addr *sin; | |
129 | extern u_char inetctlerrmap[]; | |
39674d5f SL |
130 | |
131 | if (cmd < 0 || cmd > PRC_NCMDS) | |
132 | return; | |
133 | switch (cmd) { | |
134 | ||
135 | case PRC_ROUTEDEAD: | |
136 | break; | |
137 | ||
138 | case PRC_QUENCH: | |
139 | break; | |
140 | ||
141 | /* these are handled by ip */ | |
142 | case PRC_IFDOWN: | |
143 | case PRC_HOSTDEAD: | |
144 | case PRC_HOSTUNREACH: | |
145 | break; | |
146 | ||
147 | default: | |
148 | sin = &((struct icmp *)arg)->icmp_ip.ip_dst; | |
a1edc12b | 149 | in_pcbnotify(&udb, sin, (int)inetctlerrmap[cmd], udp_abort); |
39674d5f SL |
150 | } |
151 | } | |
152 | ||
4ad99bae | 153 | udp_output(inp, m0) |
2b4b57cd | 154 | struct inpcb *inp; |
2b4b57cd | 155 | struct mbuf *m0; |
1bd53abe | 156 | { |
2b4b57cd BJ |
157 | register struct mbuf *m; |
158 | register struct udpiphdr *ui; | |
a13c006d | 159 | register struct socket *so; |
2b4b57cd BJ |
160 | register int len = 0; |
161 | ||
162 | /* | |
163 | * Calculate data length and get a mbuf | |
4aed14e3 | 164 | * for UDP and IP headers. |
2b4b57cd BJ |
165 | */ |
166 | for (m = m0; m; m = m->m_next) | |
167 | len += m->m_len; | |
cce93e4b | 168 | m = m_get(M_DONTWAIT, MT_HEADER); |
8a2f82db SL |
169 | if (m == 0) { |
170 | m_freem(m0); | |
171 | return (ENOBUFS); | |
172 | } | |
2b4b57cd BJ |
173 | |
174 | /* | |
4aed14e3 | 175 | * Fill in mbuf with extended UDP header |
2b4b57cd BJ |
176 | * and addresses and length put into network format. |
177 | */ | |
178 | m->m_off = MMAXOFF - sizeof (struct udpiphdr); | |
179 | m->m_len = sizeof (struct udpiphdr); | |
180 | m->m_next = m0; | |
181 | ui = mtod(m, struct udpiphdr *); | |
182 | ui->ui_next = ui->ui_prev = 0; | |
183 | ui->ui_x1 = 0; | |
184 | ui->ui_pr = IPPROTO_UDP; | |
e199a8a5 | 185 | ui->ui_len = len + sizeof (struct udphdr); |
4e60622a BJ |
186 | ui->ui_src = inp->inp_laddr; |
187 | ui->ui_dst = inp->inp_faddr; | |
188 | ui->ui_sport = inp->inp_lport; | |
189 | ui->ui_dport = inp->inp_fport; | |
e199a8a5 | 190 | ui->ui_ulen = htons((u_short)ui->ui_len); |
2b4b57cd BJ |
191 | |
192 | /* | |
193 | * Stuff checksum and output datagram. | |
194 | */ | |
195 | ui->ui_sum = 0; | |
ce605ce8 | 196 | ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len); |
4e60622a BJ |
197 | ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; |
198 | ((struct ip *)ui)->ip_ttl = MAXTTL; | |
a13c006d BJ |
199 | so = inp->inp_socket; |
200 | return (ip_output(m, (struct mbuf *)0, | |
201 | (so->so_options & SO_DONTROUTE) ? &routetoif : (struct route *)0, | |
202 | so->so_state & SS_PRIV)); | |
1bd53abe BJ |
203 | } |
204 | ||
a8d3bf7f | 205 | /*ARGSUSED*/ |
8075bb0e | 206 | udp_usrreq(so, req, m, nam, opt) |
53a5409e | 207 | struct socket *so; |
1bd53abe | 208 | int req; |
8075bb0e BJ |
209 | struct mbuf *m, *nam; |
210 | struct socketopt *opt; | |
1bd53abe | 211 | { |
53a5409e | 212 | struct inpcb *inp = sotoinpcb(so); |
8a2f82db | 213 | int error = 0; |
1bd53abe | 214 | |
bbb5f5dd | 215 | if (inp == 0 && req != PRU_ATTACH) |
4e60622a | 216 | return (EINVAL); |
1bd53abe BJ |
217 | switch (req) { |
218 | ||
219 | case PRU_ATTACH: | |
53a5409e BJ |
220 | if (inp != 0) |
221 | return (EINVAL); | |
8075bb0e BJ |
222 | error = in_pcballoc(so, &udb); |
223 | if (error) | |
224 | break; | |
59965020 | 225 | error = soreserve(so, 2048, 2048); |
8075bb0e BJ |
226 | if (error) |
227 | break; | |
53a5409e | 228 | break; |
1bd53abe BJ |
229 | |
230 | case PRU_DETACH: | |
53a5409e BJ |
231 | if (inp == 0) |
232 | return (ENOTCONN); | |
405c9168 | 233 | in_pcbdetach(inp); |
53a5409e | 234 | break; |
1bd53abe | 235 | |
8075bb0e BJ |
236 | case PRU_BIND: |
237 | error = in_pcbbind(inp, nam); | |
238 | break; | |
239 | ||
240 | case PRU_LISTEN: | |
241 | error = EOPNOTSUPP; | |
242 | break; | |
243 | ||
1bd53abe | 244 | case PRU_CONNECT: |
5cdc4d65 | 245 | if (inp->inp_faddr.s_addr != INADDR_ANY) |
53a5409e | 246 | return (EISCONN); |
8075bb0e | 247 | error = in_pcbconnect(inp, nam); |
8a2f82db SL |
248 | if (error == 0) |
249 | soisconnected(so); | |
1bd53abe BJ |
250 | break; |
251 | ||
2b4b57cd BJ |
252 | case PRU_ACCEPT: |
253 | return (EOPNOTSUPP); | |
254 | ||
53a5409e | 255 | case PRU_DISCONNECT: |
5cdc4d65 | 256 | if (inp->inp_faddr.s_addr == INADDR_ANY) |
53a5409e | 257 | return (ENOTCONN); |
405c9168 | 258 | in_pcbdisconnect(inp); |
53a5409e | 259 | soisdisconnected(so); |
1bd53abe BJ |
260 | break; |
261 | ||
cdad2eb1 BJ |
262 | case PRU_SHUTDOWN: |
263 | socantsendmore(so); | |
264 | break; | |
265 | ||
1aa87517 BJ |
266 | case PRU_SEND: { |
267 | struct in_addr laddr; | |
268 | ||
8075bb0e | 269 | if (nam) { |
1aa87517 | 270 | laddr = inp->inp_laddr; |
5cdc4d65 | 271 | if (inp->inp_faddr.s_addr != INADDR_ANY) |
53a5409e | 272 | return (EISCONN); |
8075bb0e | 273 | error = in_pcbconnect(inp, nam); |
02bcdb4e | 274 | if (error) |
8a2f82db | 275 | break; |
4ad99bae | 276 | } else { |
5cdc4d65 | 277 | if (inp->inp_faddr.s_addr == INADDR_ANY) |
4ad99bae BJ |
278 | return (ENOTCONN); |
279 | } | |
8a2f82db | 280 | error = udp_output(inp, m); |
8075bb0e | 281 | if (nam) { |
405c9168 | 282 | in_pcbdisconnect(inp); |
1aa87517 BJ |
283 | inp->inp_laddr = laddr; |
284 | } | |
285 | } | |
1bd53abe BJ |
286 | break; |
287 | ||
288 | case PRU_ABORT: | |
405c9168 | 289 | in_pcbdetach(inp); |
53a5409e BJ |
290 | sofree(so); |
291 | soisdisconnected(so); | |
1bd53abe BJ |
292 | break; |
293 | ||
294 | case PRU_CONTROL: | |
53a5409e | 295 | return (EOPNOTSUPP); |
1bd53abe | 296 | |
126472ab | 297 | case PRU_SOCKADDR: |
8075bb0e | 298 | in_setsockaddr(inp, nam); |
126472ab SL |
299 | break; |
300 | ||
1bd53abe BJ |
301 | default: |
302 | panic("udp_usrreq"); | |
d52566dd | 303 | } |
8a2f82db | 304 | return (error); |
d52566dd | 305 | } |