artiq/soc/runtime/net_server.c

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#include <generated/csr.h>
#ifdef CSR_ETHMAC_BASE
#include <netif/etharp.h>
#include <netif/liteethif.h>
#include <lwip/init.h>
#include <lwip/memp.h>
#include <lwip/ip4_addr.h>
#include <lwip/ip4.h>
#include <lwip/netif.h>
#include <lwip/sys.h>
#include <lwip/tcp.h>
#include <lwip/timers.h>
#include "session.h"
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#include "net_server.h"
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struct net_server_connstate {
int magic_recognized;
struct pbuf *rp;
int rp_offset;
};
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static struct net_server_connstate *cs_new(void)
{
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struct net_server_connstate *cs;
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cs = (struct net_server_connstate *)mem_malloc(sizeof(struct net_server_connstate));
if(!cs)
return NULL;
cs->magic_recognized = 0;
cs->rp = NULL;
cs->rp_offset = 0;
return cs;
}
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static void cs_free(struct net_server_connstate *cs)
{
if(cs->rp)
pbuf_free(cs->rp);
mem_free(cs);
}
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static const char net_server_magic[] = "ARTIQ coredev\n";
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static int magic_ok(struct net_server_connstate *cs)
{
return cs->magic_recognized >= 14;
}
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static struct net_server_connstate *active_cs;
static struct tcp_pcb *active_pcb;
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static void net_server_close(struct net_server_connstate *cs, struct tcp_pcb *pcb)
{
if(cs == active_cs) {
session_end();
active_cs = NULL;
active_pcb = NULL;
}
/* lwip loves to call back with broken pointers. Prevent that. */
tcp_arg(pcb, NULL);
tcp_recv(pcb, NULL);
tcp_sent(pcb, NULL);
tcp_err(pcb, NULL);
cs_free(cs);
tcp_close(pcb);
}
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static err_t net_server_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
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struct net_server_connstate *cs;
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cs = (struct net_server_connstate *)arg;
if(p) {
if(cs->rp)
pbuf_cat(cs->rp, p);
else {
cs->rp = p;
cs->rp_offset = 0;
}
} else
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net_server_close(cs, pcb);
return ERR_OK;
}
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static err_t net_server_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
{
session_ack_mem(len);
return ERR_OK;
}
static void tcp_pcb_service(void *arg, struct tcp_pcb *pcb)
{
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struct net_server_connstate *cs;
int remaining_in_pbuf;
char *rpp;
struct pbuf *next;
int r;
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cs = (struct net_server_connstate *)arg;
while(cs->rp) {
remaining_in_pbuf = cs->rp->len - cs->rp_offset;
rpp = (char *)cs->rp->payload;
while(remaining_in_pbuf > 0) {
if(cs == active_cs) {
r = session_input(&rpp[cs->rp_offset], remaining_in_pbuf);
if(r > 0) {
tcp_recved(pcb, r);
cs->rp_offset += r;
remaining_in_pbuf -= r;
} else if(r == 0)
return;
else
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net_server_close(cs, pcb);
} else {
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if(rpp[cs->rp_offset] == net_server_magic[cs->magic_recognized]) {
cs->magic_recognized++;
if(magic_ok(cs)) {
if(active_cs)
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net_server_close(active_cs, active_pcb);
session_start();
active_cs = cs;
active_pcb = pcb;
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tcp_sent(pcb, net_server_sent);
}
} else {
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net_server_close(cs, pcb);
return;
}
remaining_in_pbuf--;
cs->rp_offset++;
tcp_recved(pcb, 1);
}
}
next = cs->rp->next;
if(cs->rp->tot_len != cs->rp->len) {
pbuf_ref(next);
pbuf_free(cs->rp);
cs->rp = next;
cs->rp_offset = 0;
} else {
pbuf_free(cs->rp);
cs->rp = NULL;
}
}
}
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static void net_server_err(void *arg, err_t err)
{
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struct net_server_connstate *cs;
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cs = (struct net_server_connstate *)arg;
cs_free(cs);
}
static struct tcp_pcb *listen_pcb;
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static err_t net_server_accept(void *arg, struct tcp_pcb *newpcb, err_t err)
{
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struct net_server_connstate *cs;
cs = cs_new();
if(!cs)
return ERR_MEM;
tcp_accepted(listen_pcb);
tcp_arg(newpcb, cs);
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tcp_recv(newpcb, net_server_recv);
tcp_err(newpcb, net_server_err);
return ERR_OK;
}
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void net_server_init(void)
{
listen_pcb = tcp_new();
tcp_bind(listen_pcb, IP_ADDR_ANY, 1381);
listen_pcb = tcp_listen(listen_pcb);
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tcp_accept(listen_pcb, net_server_accept);
}
extern struct tcp_pcb *tcp_active_pcbs;
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void net_server_service(void)
{
struct tcp_pcb *pcb;
void *data;
int len, sndbuf;
/* Assume all active TCP PCBs with a non-NULL arg are our connections. */
pcb = tcp_active_pcbs;
while(pcb) {
if(pcb->callback_arg)
tcp_pcb_service(pcb->callback_arg, pcb);
pcb = pcb->next;
}
if(active_cs) {
session_poll(&data, &len);
if(len > 0) {
sndbuf = tcp_sndbuf(active_pcb);
if(len > sndbuf)
len = sndbuf;
tcp_write(active_pcb, data, len, 0);
session_ack_data(len);
}
if(len < 0)
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net_server_close(active_cs, active_pcb);
}
}
#endif /* CSR_ETHMAC_BASE */