1 | //////////////////////////////////////////////////////////////////////////////// |
---|
2 | // Copyright (c) 2004 Xilinx, Inc. All rights reserved. |
---|
3 | // |
---|
4 | // Xilinx, Inc. |
---|
5 | // XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A |
---|
6 | // COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS |
---|
7 | // ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR |
---|
8 | // STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION |
---|
9 | // IS FREE FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE |
---|
10 | // FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION. |
---|
11 | // XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO |
---|
12 | // THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO |
---|
13 | // ANY WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE |
---|
14 | // FROM CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY |
---|
15 | // AND FITNESS FOR A PARTICULAR PURPOSE. |
---|
16 | // |
---|
17 | // File : udp.c |
---|
18 | // Date : 2002, March 20. |
---|
19 | // Author : Sathya Thammanur |
---|
20 | // Company: Xilinx |
---|
21 | // Group : Emerging Software Technologies |
---|
22 | // |
---|
23 | // Summary: |
---|
24 | // UDP layer specific functions |
---|
25 | // |
---|
26 | // $Id: udp.c,v 1.2.8.6 2005/11/15 23:41:10 salindac Exp $ |
---|
27 | // |
---|
28 | //////////////////////////////////////////////////////////////////////////////// |
---|
29 | |
---|
30 | //////////////////////////////////////////////////////////////////////////////// |
---|
31 | // see copyright.txt for Rice University/Mango Communications modifications |
---|
32 | //////////////////////////////////////////////////////////////////////////////// |
---|
33 | |
---|
34 | #include <xilnet_xilsock.h> |
---|
35 | #include <stdio.h> |
---|
36 | |
---|
37 | |
---|
38 | /* |
---|
39 | * udp packet handler |
---|
40 | * "buf" is a IP datagram |
---|
41 | * currently, this fn just checks for the src port and returns |
---|
42 | * there is only one udp conn available. multiple conns has to have |
---|
43 | * more support from high level applns for handling packets for diff conns. |
---|
44 | */ |
---|
45 | |
---|
46 | int xilnet_udp(unsigned char* buf, int len, unsigned int eth_dev_num) { |
---|
47 | |
---|
48 | int i; |
---|
49 | struct xilsock_socket *sockets = (struct xilsock_socket *)eth_device[eth_dev_num].xilsock_sockets; |
---|
50 | struct xilnet_udp_hdr *udph = (struct xilnet_udp_hdr *)(buf+IP_HDR_LEN*4); |
---|
51 | struct xilnet_udp_conn *conns = (struct xilnet_udp_conn *)eth_device[eth_dev_num].xilnet_udp_conns; |
---|
52 | struct xilnet_udp_conn *curr_conn = NULL; |
---|
53 | pktSrcInfo pktInfo; |
---|
54 | |
---|
55 | #ifdef _DEBUG_ |
---|
56 | xil_printf("BEGIN xilnet_udp(): \n"); |
---|
57 | #endif |
---|
58 | |
---|
59 | // check for an open conn |
---|
60 | for (i = 0; i < XILNET_MAX_UDP_CONNS; i++) { |
---|
61 | if (conns[i].state != UDP_CONN_CLOSED) { |
---|
62 | // match a conn |
---|
63 | if ( (conns[i].src_port == Xil_Ntohs(udph->dst_port))) { |
---|
64 | curr_conn = (conns + i); |
---|
65 | |
---|
66 | // update the conn with the dst ip only the first time |
---|
67 | conns[i].dst_port = Xil_Ntohs(udph->src_port); |
---|
68 | conns[i].dst_ip[0] = buf[IP_SADDR_BASE]; |
---|
69 | conns[i].dst_ip[1] = buf[IP_SADDR_BASE+1]; |
---|
70 | conns[i].dst_ip[2] = buf[IP_SADDR_BASE+2]; |
---|
71 | conns[i].dst_ip[3] = buf[IP_SADDR_BASE+3]; |
---|
72 | break; |
---|
73 | } |
---|
74 | } |
---|
75 | } |
---|
76 | // write data onto the socket of the found conn |
---|
77 | if (curr_conn) { |
---|
78 | buf = buf + (IP_HDR_LEN*4) + UDP_HDR_LEN; |
---|
79 | sockets[curr_conn->fd].recvbuf.buf = buf; |
---|
80 | sockets[curr_conn->fd].recvbuf.size = len - (IP_HDR_LEN*4) - UDP_HDR_LEN; |
---|
81 | |
---|
82 | pktInfo.destPort = curr_conn->dst_port; |
---|
83 | pktInfo.srcPort = curr_conn->src_port; |
---|
84 | |
---|
85 | #ifdef _DEBUG_ |
---|
86 | xil_printf(" pktInfo.destPort: %d, pktInfo.srcPort: %d\n", pktInfo.destPort, pktInfo.srcPort); |
---|
87 | #endif |
---|
88 | |
---|
89 | pktInfo.srcIPAddr = (u32)((curr_conn->dst_ip[0]<<24)+(curr_conn->dst_ip[1]<<16)+(curr_conn->dst_ip[2]<<8)+(curr_conn->dst_ip[3])); |
---|
90 | |
---|
91 | #ifdef _DEBUG_ |
---|
92 | xil_printf(" pktInfo.srcIPAddr = %d.%d.%d.%d\n",( pktInfo.srcIPAddr>>24)&0xFF,( pktInfo.srcIPAddr>>16)&0xFF,( pktInfo.srcIPAddr>>8)&0xFF,( pktInfo.srcIPAddr)&0xFF); |
---|
93 | #endif |
---|
94 | |
---|
95 | curr_conn->rxCallback(buf,len - (IP_HDR_LEN*4) - UDP_HDR_LEN, &pktInfo, eth_dev_num); |
---|
96 | |
---|
97 | return (len - (IP_HDR_LEN*4) - UDP_HDR_LEN); |
---|
98 | } else { |
---|
99 | #ifdef _DEBUG_ |
---|
100 | xil_printf(" No socket connection found %d : \n", Xil_Ntohs(udph->dst_port) ); |
---|
101 | xil_printf(" Current connections are: \n"); |
---|
102 | for (i = 0; i < XILNET_MAX_UDP_CONNS; i++) { |
---|
103 | if (conns[i].state != UDP_CONN_CLOSED) { |
---|
104 | xil_printf(" UDP conn[%d] = %d \n", i, conns[i].src_port); |
---|
105 | } |
---|
106 | } |
---|
107 | #endif |
---|
108 | } |
---|
109 | |
---|
110 | #ifdef _DEBUG_ |
---|
111 | xil_printf("END xilnet_udp(): \n"); |
---|
112 | #endif |
---|
113 | |
---|
114 | return 0; |
---|
115 | } |
---|
116 | |
---|
117 | |
---|
118 | /* |
---|
119 | * udp_header: fills the udp header for the packet to be sent |
---|
120 | */ |
---|
121 | |
---|
122 | void xilnet_udp_header(struct xilnet_udp_conn *conn, unsigned char* buf, int len, unsigned int eth_dev_num) { |
---|
123 | |
---|
124 | struct xilnet_udp_hdr *udph = (struct xilnet_udp_hdr*) buf; |
---|
125 | |
---|
126 | udph->src_port = Xil_Htons(conn->src_port); |
---|
127 | udph->dst_port = Xil_Htons(conn->dst_port); |
---|
128 | udph->udp_len = Xil_Htons(len); |
---|
129 | udph->check_sum = 0; |
---|
130 | |
---|
131 | // NOTE: Currently, we are not computing the checksum on the UDP packets. This is primarly due to the long |
---|
132 | // compute time (~1ms @ 160 MHz). It is ok to not compute the checksum since we are using IPv4 (which has its |
---|
133 | // own checksum calculation) and we are only using local networks. |
---|
134 | // |
---|
135 | // udph->check_sum = Xil_Htons(xilnet_udp_tcp_calc_chksum(buf, len, eth_device[eth_dev_num].node_ip_addr, conn->dst_ip, IP_PROTO_UDP)); |
---|
136 | } |
---|
137 | |
---|
138 | |
---|
139 | /* |
---|
140 | * xilnet_udp_tcp_calc_chksum: Calculate UDP checksum |
---|
141 | */ |
---|
142 | unsigned short xilnet_udp_tcp_calc_chksum(unsigned char *buf, int buflen, unsigned char *saddr, |
---|
143 | unsigned char *daddr, unsigned short protocol) { |
---|
144 | unsigned int sum = 0; |
---|
145 | unsigned short w16 = 0; |
---|
146 | unsigned short proto = protocol; |
---|
147 | short pad = 0; |
---|
148 | int i = 0; |
---|
149 | |
---|
150 | //check if udp/tcp datagram needs padding |
---|
151 | if (buflen %2) { |
---|
152 | pad = 1; |
---|
153 | buf[buflen+1] = 0; |
---|
154 | } |
---|
155 | // get the 16bit sum for udp/tcp datagram |
---|
156 | for (i = 0; i < buflen+pad; i = i + 2) { |
---|
157 | w16 = ((buf[i] << 8) & 0xFF00) + (buf[i+1] & 0xFF); |
---|
158 | sum = sum + (unsigned int) w16; |
---|
159 | } |
---|
160 | |
---|
161 | // add the src and dst ip address |
---|
162 | for (i = 0; i < 4; i = i + 2) { |
---|
163 | w16 = ((saddr[i] << 8) & 0xFF00) + (saddr[i+1] & 0xFF); |
---|
164 | sum = sum + (unsigned int) w16; |
---|
165 | } |
---|
166 | |
---|
167 | for (i = 0; i < 4; i = i + 2) { |
---|
168 | w16 = ((daddr[i] << 8) & 0xFF00) + (daddr[i+1] & 0x00FF); |
---|
169 | sum = sum + (unsigned int) w16; |
---|
170 | } |
---|
171 | // add proto and udplength to sum |
---|
172 | sum = sum + proto + buflen; |
---|
173 | |
---|
174 | while (sum >> 16) |
---|
175 | sum = (sum & 0xFFFF) + (sum >> 16); |
---|
176 | |
---|
177 | return ((unsigned short)(~sum)); |
---|
178 | } |
---|
179 | |
---|
180 | |
---|
181 | /****************************** |
---|
182 | * udp connection management ** |
---|
183 | ******************************/ |
---|
184 | |
---|
185 | /* |
---|
186 | * initialize all udp conns so that all the states are CLOSED |
---|
187 | */ |
---|
188 | |
---|
189 | void xilnet_udp_init_conns(unsigned int eth_dev_num) { |
---|
190 | |
---|
191 | int i; |
---|
192 | struct xilnet_udp_conn *conns = (struct xilnet_udp_conn *)eth_device[eth_dev_num].xilnet_udp_conns; |
---|
193 | |
---|
194 | for (i = 0; i < XILNET_MAX_UDP_CONNS; i++) { |
---|
195 | conns[i].state = UDP_CONN_CLOSED; |
---|
196 | } |
---|
197 | } |
---|
198 | |
---|
199 | |
---|
200 | /* |
---|
201 | * open a udp conn: |
---|
202 | * opens a new udp conn and changes state to OPEN |
---|
203 | * returns connection index if able to open else -1 if not possible |
---|
204 | */ |
---|
205 | |
---|
206 | int xilnet_udp_open_conn(unsigned short port, void (*callback) (), unsigned int eth_dev_num) { |
---|
207 | |
---|
208 | int i; |
---|
209 | struct xilnet_udp_conn *conns = (struct xilnet_udp_conn *)eth_device[eth_dev_num].xilnet_udp_conns; |
---|
210 | |
---|
211 | if (!eth_device[eth_dev_num].is_udp_init) { |
---|
212 | xilnet_udp_init_conns(eth_dev_num); |
---|
213 | eth_device[eth_dev_num].is_udp_init = 1; |
---|
214 | } |
---|
215 | |
---|
216 | for (i = 0; i < XILNET_MAX_UDP_CONNS; i++) { |
---|
217 | if (conns[i].state == UDP_CONN_CLOSED) |
---|
218 | break; |
---|
219 | } |
---|
220 | |
---|
221 | if (i < XILNET_MAX_UDP_CONNS) { |
---|
222 | conns[i].src_port = port; |
---|
223 | conns[i].state = UDP_CONN_OPEN; |
---|
224 | conns[i].rxCallback = callback; |
---|
225 | return i; |
---|
226 | } |
---|
227 | |
---|
228 | return -1; |
---|
229 | } |
---|
230 | |
---|
231 | |
---|
232 | /* close a udp conn: |
---|
233 | * closes a udp conn by changing state to CLOSED |
---|
234 | * returns 1 if able to close else return -1 |
---|
235 | */ |
---|
236 | |
---|
237 | int xilnet_udp_close_conn(struct xilnet_udp_conn *conn, unsigned int eth_dev_num) { |
---|
238 | |
---|
239 | int i; |
---|
240 | struct xilnet_udp_conn *conns = (struct xilnet_udp_conn *)eth_device[eth_dev_num].xilnet_udp_conns; |
---|
241 | |
---|
242 | for (i = 0; i < XILNET_MAX_UDP_CONNS; i++) { |
---|
243 | if ( (conns+i) == conn) { |
---|
244 | conns[i].state = UDP_CONN_CLOSED; |
---|
245 | return 1; |
---|
246 | } |
---|
247 | } |
---|
248 | |
---|
249 | return -1; |
---|
250 | } |
---|
251 | |
---|