aboutsummaryrefslogtreecommitdiffstats
path: root/core/legacynet/core.c
blob: eacb49277a6a6a07999d25faa5dee5974deef9d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
#include <syslinux/pxe_api.h>
#include <com32.h>
#include <core.h>
#include <net.h>
#include <pxe.h>
#include <minmax.h>

/* Common receive buffer */
static __lowmem char packet_buf[PKTBUF_SIZE] __aligned(16);

extern uint16_t get_port(void);
extern void free_port(uint16_t);

const struct url_scheme url_schemes[] = {
    { "tftp", tftp_open, 0 },
    { NULL, NULL, 0 }
};

/**
 * Open a socket
 *
 * @param:socket, the socket to open
 *
 * @out: error code, 0 on success, -1 on failure
 */
int core_udp_open(struct pxe_pvt_inode *socket __unused)
{
    struct net_private_tftp *priv = &socket->net.tftp;

    /* Allocate local UDP port number */
    priv->localport = get_port();

    return 0;
}

/**
 * Close a socket
 *
 * @param:socket, the socket to open
 */
void core_udp_close(struct pxe_pvt_inode *socket)
{
    struct net_private_tftp *priv = &socket->net.tftp;

    if (priv->localport)
	free_port(priv->localport);
}

/**
 * Establish a connection on an open socket
 *
 * @param:socket, the open socket
 * @param:ip, the ip address
 * @param:port, the port number, host-byte order
 */
void core_udp_connect(struct pxe_pvt_inode *socket, uint32_t ip,
		      uint16_t port)
{
    struct net_private_tftp *priv = &socket->net.tftp;

    socket->tftp_remoteport = htons(port);
    priv->remoteip = ip;

}

/**
 * Tear down a connection on an open socket
 *
 * @param:socket, the open socket
 */
void core_udp_disconnect(struct pxe_pvt_inode *socket __unused)
{
}

/**
 * Read data from the network stack
 *
 * @param:socket, the open socket
 * @param:buf, location of buffer to store data
 * @param:buf_len, size of buffer

 * @out: src_ip, ip address of the data source
 * @out: src_port, port number of the data source, host-byte order
 */
int core_udp_recv(struct pxe_pvt_inode *socket, void *buf, uint16_t *buf_len,
		  uint32_t *src_ip, uint16_t *src_port)
{
    static __lowmem struct s_PXENV_UDP_READ  udp_read;
    struct net_private_tftp *priv = &socket->net.tftp;
    uint16_t bytes;
    int err;

    udp_read.status      = 0;
    udp_read.buffer      = FAR_PTR(packet_buf);
    udp_read.buffer_size = PKTBUF_SIZE;
    udp_read.dest_ip     = IPInfo.myip;
    udp_read.d_port      = priv->localport;

    err = pxe_call(PXENV_UDP_READ, &udp_read);
    if (err)
	return err;

    if (udp_read.status)
	return udp_read.status;

    bytes = min(udp_read.buffer_size, *buf_len);
    memcpy(buf, packet_buf, bytes);

    *src_ip = udp_read.src_ip;
    *src_port = ntohs(udp_read.s_port);
    *buf_len = bytes;

    return 0;
}

/**
 * Send a UDP packet.
 *
 * @param:socket, the open socket
 * @param:data, data buffer to send
 * @param:len, size of data bufer
 */
void core_udp_send(struct pxe_pvt_inode *socket, const void *data, size_t len)
{
    static __lowmem struct s_PXENV_UDP_WRITE udp_write;
    struct net_private_tftp *priv = &socket->net.tftp;
    void *lbuf;
    uint16_t tid;

    lbuf = lmalloc(len);
    if (!lbuf)
	return;

    memcpy(lbuf, data, len);

    tid = priv->localport;   /* TID(local port No) */
    udp_write.buffer    = FAR_PTR(lbuf);
    udp_write.ip        = priv->remoteip;
    udp_write.gw        = gateway(udp_write.ip);
    udp_write.src_port  = tid;
    udp_write.dst_port  = socket->tftp_remoteport;
    udp_write.buffer_size = len;

    pxe_call(PXENV_UDP_WRITE, &udp_write);

    lfree(lbuf);
}

/**
 * Send a UDP packet to a destination
 *
 * @param:socket, the open socket
 * @param:data, data buffer to send
 * @param:len, size of data bufer
 * @param:ip, the ip address
 * @param:port, the port number, host-byte order
 */
void core_udp_sendto(struct pxe_pvt_inode *socket, const void *data, size_t len,
		     uint32_t ip, uint16_t port)
{
    static __lowmem struct s_PXENV_UDP_WRITE udp_write;
    struct net_private_tftp *priv = &socket->net.tftp;
    void *lbuf;
    uint16_t tid;

    lbuf = lmalloc(len);
    if (!lbuf)
	return;

    memcpy(lbuf, data, len);

    tid = priv->localport;   /* TID(local port No) */
    udp_write.buffer    = FAR_PTR(lbuf);
    udp_write.ip        = ip;
    udp_write.gw        = gateway(udp_write.ip);
    udp_write.src_port  = tid;
    udp_write.dst_port  = htons(port);
    udp_write.buffer_size = len;

    pxe_call(PXENV_UDP_WRITE, &udp_write);

    lfree(lbuf);
}


/**
 * Network stack-specific initialization
 *
 * Initialize UDP stack
 */
void net_core_init(void)
{
    int err;
    static __lowmem struct s_PXENV_UDP_OPEN udp_open;
    udp_open.src_ip = IPInfo.myip;
    err = pxe_call(PXENV_UDP_OPEN, &udp_open);
    if (err || udp_open.status) {
        printf("Failed to initialize UDP stack ");
        printf("%d\n", udp_open.status);
	kaboom();
    }
}

void probe_undi(void)
{
}

void pxe_init_isr(void)
{
}

int reset_pxe(void)
{
    static __lowmem struct s_PXENV_UDP_CLOSE udp_close;
    int err = 0;

    pxe_idle_cleanup();

    pxe_call(PXENV_UDP_CLOSE, &udp_close);

    return err;
}