1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1991-2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 *
26 * udp.c, Code implementing the UDP internet protocol.
27 */
28
29 #pragma ident "%Z%%M% %I% %E% SMI"
30
31 #include <sys/types.h>
32 #include <socket_impl.h>
33 #include <socket_inet.h>
34 #include <sys/salib.h>
35 #include <sys/socket.h>
36 #include <netinet/in_systm.h>
37 #include <netinet/in.h>
38 #include <netinet/ip.h>
39 #include <netinet/udp.h>
40
41 #include "udp_inet.h"
42 #include "ipv4.h"
43 #include "ipv4_impl.h"
44 #include "mac.h"
45 #include "mac_impl.h"
46 #include "v4_sum_impl.h"
47 #include <sys/bootdebug.h>
48
49 /* Checksum all architectures */
50 static int udp_cksum_flag = TRUE; /* checksum on if set */
51
52 /*
53 * Initialize the udp-specific parts of a socket.
54 */
55 void
udp_socket_init(struct inetboot_socket * isp)56 udp_socket_init(struct inetboot_socket *isp)
57 {
58 isp->type = INETBOOT_DGRAM;
59 isp->proto = IPPROTO_UDP;
60 isp->input[TRANSPORT_LVL] = udp_input;
61 isp->output[TRANSPORT_LVL] = udp_output;
62 isp->close[TRANSPORT_LVL] = NULL;
63 isp->headerlen[TRANSPORT_LVL] = udp_header_len;
64 isp->ports = udp_ports;
65 }
66
67 /*
68 * Return the size of an UDP header
69 */
70 /* ARGSUSED */
71 int
udp_header_len(struct inetgram * igm)72 udp_header_len(struct inetgram *igm)
73 {
74 return (sizeof (struct udphdr));
75 }
76
77 /*
78 * Return the requested port number in network order.
79 */
80 in_port_t
udp_ports(uint16_t * udphp,enum Ports request)81 udp_ports(uint16_t *udphp, enum Ports request)
82 {
83 if (request == SOURCE)
84 return (((struct udphdr *)udphp)->uh_sport);
85 return (((struct udphdr *)udphp)->uh_dport);
86 }
87
88 /*
89 * Process the IPv4 datagram that IPv4 has given us. We:
90 *
91 * 1) Checksum the datagram if checksum is turned on.
92 * 2) Strip the udp header from the inetgram.
93 * 3) Return the number of TRANSPORT frames for success, -1 if a
94 * failure occurred.
95 *
96 * Arguments: index: index into the open socket table, ip is the inetgram
97 * we got from IPv4, which will contain the udp header and all the data.
98 */
99 int
udp_input(int index)100 udp_input(int index)
101 {
102 int frames = 0, header_len;
103 struct inetgram *igp, *ugp = NULL;
104 struct udphdr *udphp;
105 mblk_t *mp;
106
107 #ifdef DEBUG
108 printf("udp_input(%d) ###############################\n", index);
109 #endif
110 while ((igp = sockets[index].inq) != NULL) {
111 if (igp->igm_level != TRANSPORT_LVL) {
112 #ifdef DEBUG
113 printf("udp_input(%d): level %d datagram discarded.\n",
114 index, igp->igm_level);
115 #endif /* DEBUG */
116 del_gram(&sockets[index].inq, igp, TRUE);
117 continue;
118 }
119 mp = igp->igm_mp;
120 udphp = (struct udphdr *)(mp->b_rptr +
121 IPH_HDR_LENGTH(mp->b_rptr));
122 header_len = (sockets[index].headerlen[TRANSPORT_LVL])(NULL);
123 mp->b_rptr = ((unsigned char *)udphp) + header_len;
124 mp->b_wptr = ((unsigned char *)udphp) + ntohs(udphp->uh_ulen);
125
126 /* generate checksum */
127 if (udp_cksum_flag && udphp->uh_sum != 0) {
128 if (udp_chksum(udphp, &igp->igm_saddr.sin_addr,
129 &igp->igm_target, sockets[index].proto) != 0) {
130 dprintf("udp_input(%d): bad udp chksum "
131 "from %s.\n", index,
132 inet_ntoa(igp->igm_saddr.sin_addr));
133 del_gram(&sockets[index].inq, igp, TRUE);
134 continue;
135 }
136 }
137
138 /* validate port number */
139 if (sockets[index].bind.sin_port != udphp->uh_dport) {
140 dprintf("udp_input(%d): Unexpected port number: "
141 "%d != %d from %s.\n", index,
142 ntohs(udphp->uh_dport), ntohs(
143 sockets[index].bind.sin_port),
144 inet_ntoa(igp->igm_saddr.sin_addr));
145 del_gram(&sockets[index].inq, igp, TRUE);
146 continue;
147 }
148
149 igp->igm_level = APP_LVL;
150 del_gram(&sockets[index].inq, igp, FALSE);
151 add_grams(&ugp, igp);
152 frames++;
153 }
154 add_grams(&sockets[index].inq, ugp);
155
156 return (frames);
157 }
158
159 /*
160 * Create a UDP datagram given the data and sockaddr_in we got from sendto().
161 * We will calculate the checksum if checksumming is turned on, and fill in
162 * appropriate length and port fields. We convert the inetgram from a
163 * block of data into a udp datagram... Returns the number of bytes contained
164 * in the udp datagram (including header).
165 *
166 * Arguments: index: index into the open socket table, ogp is the inetgram
167 * we got from sendto(), which will contain just the data and sockaddr_in.
168 */
169 int
udp_output(int index,struct inetgram * ogp)170 udp_output(int index, struct inetgram *ogp)
171 {
172 struct udphdr *udphp;
173 mblk_t *mp;
174
175 #ifdef DEBUG
176 printf("udp_output(%d): 0x%x, %d\n", index, ogp->igm_mp,
177 ogp->igm_mp->b_wptr - ogp->igm_mp->b_rptr);
178 #endif /* DEBUG */
179
180 mp = ogp->igm_mp;
181 mp->b_rptr -= sizeof (struct udphdr);
182 udphp = (struct udphdr *)(mp->b_rptr);
183
184 udphp->uh_dport = ogp->igm_saddr.sin_port;
185 if (sockets[index].bound)
186 udphp->uh_sport = sockets[index].bind.sin_port;
187 else
188 udphp->uh_sport = ogp->igm_saddr.sin_port;
189 udphp->uh_ulen = htons(mp->b_wptr - mp->b_rptr);
190 udphp->uh_sum = 0;
191
192 if (udp_cksum_flag) {
193 udphp->uh_sum = udp_chksum(udphp, &sockets[index].bind.sin_addr,
194 &ogp->igm_saddr.sin_addr, sockets[index].proto);
195 }
196
197 ogp->igm_level = NETWORK_LVL;
198
199 return (0);
200 }
201