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/cmd/netstack/ether.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/cmd/netstack/ether.c

(limited to 'src/cmd/netstack/ether.c')

diff --git a/src/cmd/netstack/ether.c b/src/cmd/netstack/ether.c
new file mode 100644
index 0000000..52abac2
--- /dev/null
+++ b/src/cmd/netstack/ether.c
@@ -0,0 +1,59 @@
+#include <camellia/syscalls.h>
+#include "proto.h"
+#include "util.h"
+
+enum {
+	DstMAC    =  0,
+	SrcMAC    =  6,
+	EtherType = 12,
+	Payload   = 14,
+};
+struct ethq *ether_queue;
+
+void ether_parse(const uint8_t *buf, size_t len) {
+	struct ethernet ether = (struct ethernet){
+		.src = (void*)(buf + SrcMAC),
+		.dst = (void*)(buf + DstMAC),
+		.type = nget16(buf + EtherType),
+	};
+
+	for (struct ethq **iter = &ether_queue; iter && *iter; ) {
+		struct ethq *qe = *iter;
+		_sys_fs_respond(qe->h, buf, len, 0);
+		/* remove entry */
+		/* yes, doing it this way here doesn't make sense. i'm preparing for filtering */
+		*iter = qe->next;
+		free(qe);
+	}
+
+	switch (ether.type) {
+		case ET_IPv4:
+			ipv4_parse(buf + Payload, len - Payload, ether);
+			break;
+		case ET_ARP:
+			arp_parse(buf + Payload, len - Payload);
+			break;
+	}
+}
+
+static const size_t fhoff = sizeof(size_t);
+uint8_t *ether_start(size_t len, struct ethernet ether) {
+	if (len < 60 - Payload) len = 60 - Payload;
+
+	if (!ether.dst) eprintf("NULL ether.dst!"); // TODO arp? i guess?
+	if (!ether.src) ether.src = &state.mac;
+
+	uint8_t *buf = malloc(fhoff + Payload + len);
+	memset(buf, 0, fhoff + Payload + len);
+	*(size_t*)buf = len + Payload;
+	memcpy(buf + fhoff + DstMAC, ether.dst, 6);
+	memcpy(buf + fhoff + SrcMAC, ether.src, 6);
+	nput16(buf + fhoff + EtherType, ether.type);
+	return buf + fhoff + Payload;
+}
+void ether_finish(uint8_t *pkt) {
+	uint8_t *buf = pkt - Payload - fhoff;
+	size_t len = *(size_t*)buf;
+	_sys_write(state.raw_h, buf + fhoff, len, 0, 0);
+	free(buf);
+}
-- 
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