Decouple from Ethernet, introduce "l2"

src/l2_ppp.c

@@ -0,0 +1,115 @@
+#include "l2.h"
+#include "log.h"
+#include "net.h"
+#include "net_builtin.h"
+#include "printf.h"
+#include "util.h"
+
+#if MG_ENABLE_TCPIP
+
+#if defined(__DCC__)
+#pragma pack(1)
+#else
+#pragma pack(push, 1)
+#endif
+
+struct ppp {  // RFC-1662
+  uint8_t addr, ctrl;
+  uint16_t proto;
+};
+
+struct lcp {  // RFC-1661
+  uint8_t code, id, len[2];
+};
+
+struct ipcp { // RFC-1332
+  uint8_t code;
+};
+
+struct ipv6cp { // RFC-5072
+  uint8_t code;
+};
+
+#if defined(__DCC__)
+#pragma pack(0)
+#else
+#pragma pack(pop)
+#endif
+
+
+void mg_l2_ppp_init(struct mg_l2addr *addr, uint16_t *mtu,
+                    uint16_t *framesize) {
+  (void) addr;
+  *mtu = 1500;        // 1492 for PPPoE
+  *framesize = 1540;  // *** TODO(scaprile): actual value, check for PPPoE too
+}
+
+uint8_t *mg_l2_ppp_header(enum mg_l2proto proto, struct mg_l2addr *src,
+                          struct mg_l2addr *dst, uint8_t *frame) {
+  (void) src;
+  (void) dst;
+  (void) proto;
+  return frame;
+}
+
+size_t mg_l2_ppp_footer(size_t len, uint8_t *frame) {
+  (void) frame;
+  return len;
+}
+
+bool mg_l2_ppp_rx(struct mg_tcpip_if *ifp, enum mg_l2proto *proto,
+                  struct mg_str *pay, struct mg_str *raw) {
+#if 0
+if (ppp->addr == MG_PPP_ADDR && ppp->ctrl == MG_PPP_CTRL) {
+  code = ntohs(ppp->proto);
+  payload = (uint8_t *) (ppp + 1);
+} else { // Address-and-Control-Field-Compressed PPP header
+  uint16_t *cppp = (uint16_t *) ppp;
+  code = ntohs(*cppp);
+  payload = (uint8_t *) (cppp + 1);
+}
+#endif
+  *pay = *raw;
+  *proto = MG_TCPIP_L2PROTO_IPV4;
+  (void) ifp;
+  return true;
+}
+
+struct mg_l2addr *mg_l2_ppp_getaddr(uint8_t *frame) {
+  (void) frame;
+  return &s_mapip;  // bogus
+}
+
+extern struct mg_l2addr s_mapip;
+
+struct mg_l2addr *mg_l2_ppp_mapip(enum mg_l2addrtype addrtype,
+                                  struct mg_addr *addr) {
+  (void) addrtype;
+  (void) addr;
+  return &s_mapip;  // bogus
+}
+
+#if MG_ENABLE_IPV6
+bool mg_l2_ppp_genip6(uint64_t *ip6, uint8_t prefix_len,
+                      struct mg_l2addr *addr) {
+  (void) ip6;
+  (void) prefix_len;
+  (void) addr;
+  return false;
+}
+
+bool mg_l2_ppp_ip6get(struct mg_l2addr *addr, uint8_t *opts, uint8_t len) {
+  (void) addr;
+  (void) opts;
+  (void) len;
+  return false;
+}
+
+uint8_t mg_l2_ppp_ip6put(struct mg_l2addr *addr, uint8_t *opts) {
+  (void) addr;
+  (void) opts;
+  return 0;
+}
+#endif
+
+#endif