From 642b5fb0007b64c77d186fcb018d571152ee1d47 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Mon, 14 Aug 2023 18:51:07 +0200
Subject: reorganization: first steps

---
 src/user/app/netstack/udp.c | 124 --------------------------------------------
 1 file changed, 124 deletions(-)
 delete mode 100644 src/user/app/netstack/udp.c

(limited to 'src/user/app/netstack/udp.c')

diff --git a/src/user/app/netstack/udp.c b/src/user/app/netstack/udp.c
deleted file mode 100644
index 3d560ae..0000000
--- a/src/user/app/netstack/udp.c
+++ /dev/null
@@ -1,124 +0,0 @@
-#include "proto.h"
-#include "util.h"
-
-enum {
-	SrcPort  = 0,
-	DstPort  = 2,
-	Length   = 4,
-	Checksum = 6,
-	Payload  = 8,
-};
-
-
-struct udp_conn {
-	uint32_t lip, rip;
-	uint16_t lport, rport;
-	mac_t rmac;
-	void (*on_conn)(struct udp_conn *, void *); /* if non-NULL - listening, if NULL - estabilished */
-	void (*on_recv)(const void *, size_t, void *);
-	void *carg;
-	struct udp_conn *next, **link;
-};
-static struct udp_conn *conns;
-static void conns_append(struct udp_conn *c) {
-	c->next = conns;
-	if (c->next)
-		c->next->link = &c->next;
-	c->link = &conns;
-	*c->link = c;
-}
-void udp_listen(
-	uint16_t port,
-	void (*on_conn)(struct udp_conn *, void *carg),
-	void (*on_recv)(const void *, size_t, void *carg),
-	void *carg)
-{
-	if (!on_conn) return;
-	struct udp_conn *c = malloc(sizeof *c);
-	c->lport = port;
-	c->lip = state.ip;
-	c->on_conn = on_conn;
-	c->on_recv = on_recv;
-	c->carg = carg;
-	conns_append(c);
-}
-struct udp_conn *udpc_new(
-	struct udp u,
-	void (*on_recv)(const void *, size_t, void *carg),
-	void *carg)
-{
-	struct udp_conn *c = malloc(sizeof *c);
-	memset(c, 0, sizeof *c);
-	c->lip = u.ip.src;
-	c->rip = u.ip.dst;
-	c->lport = u.src ? u.src : 50000; // TODO randomize source ports
-	c->rport = u.dst;
-	if (arpcache_get(c->rip, &c->rmac) < 0) {
-		// TODO make arp request, wait for reply
-		eprintf("not in ARP cache, unimplemented");
-		free(c);
-		return NULL;
-	}
-	c->on_recv = on_recv;
-	c->carg = carg;
-	conns_append(c);
-	return c;
-}
-void udpc_send(struct udp_conn *c, const void *buf, size_t len) {
-	uint8_t *pkt = malloc(Payload + len);
-	nput16(pkt + SrcPort, c->lport);
-	nput16(pkt + DstPort, c->rport);
-	nput16(pkt + Length, Payload + len);
-	nput16(pkt + Checksum, 0);
-	memcpy(pkt + Payload, buf, len);
-	ipv4_send(pkt, Payload + len, (struct ipv4){
-		.proto = 0x11,
-		.src = c->lip,
-		.dst = c->rip,
-		.e.dst = &c->rmac,
-	});
-	free(pkt);
-}
-void udpc_close(struct udp_conn *c) {
-	if (c->next) c->next->link = c->link;
-	*(c->link) = c->next;
-	free(c);
-}
-
-
-void udp_parse(const uint8_t *buf, size_t len, struct ipv4 ip) {
-	uint16_t srcport = nget16(buf + SrcPort);
-	uint16_t dstport = nget16(buf + DstPort);
-	bool active = false;
-
-	for (struct udp_conn *iter = conns; iter; iter = iter->next) {
-		if (iter->on_conn && dstport == iter->lport) {
-			iter->on_conn(iter, iter->carg);
-			iter->on_conn = NULL;
-			iter->rport = srcport;
-			memcpy(&iter->rmac, ip.e.src, sizeof(mac_t));
-			iter->rip = ip.src;
-		}
-		if (iter->rip == ip.src &&
-			iter->rport == srcport &&
-			iter->lport == dstport &&
-			iter->on_recv)
-		{
-			active = true;
-			iter->on_recv(buf + Payload, len - Payload, iter->carg);
-		}
-	}
-
-	if (!active) {
-		uint8_t *pkt = malloc(4 + ip.hlen + 8);
-		nput32(pkt, 0);
-		memcpy(pkt + 4, ip.header, ip.hlen + 8);
-		icmp_send(pkt, 4 + ip.hlen + 8, (struct icmp){
-			.type = 3, /* destination unreachable */
-			.code = 3, /* port unreachable */
-			.ip.dst = ip.src,
-			.ip.e.dst = ip.e.src,
-		});
-		free(pkt);
-	}
-}
-- 
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