From abbace3df4650d72bc1fb5b430cccd655826f888 Mon Sep 17 00:00:00 2001
From: Lucas Schumacher <technolucas@protonmail.com>
Date: Tue, 29 Apr 2025 01:42:49 -0400
Subject: [PATCH] Actually add ipv4 header for ipv4 support

---
 net/ipv4.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 net/ipv4.h

diff --git a/net/ipv4.h b/net/ipv4.h
new file mode 100644
index 0000000..d98fbc5
--- /dev/null
+++ b/net/ipv4.h
@@ -0,0 +1,53 @@
+#ifndef MINIMAL_IPV4_H
+#define MINIMAL_IPV4_H
+// From kernel header in.h 
+// location: uapi/linux/in.h or linux/in.h (older kerns) or /usr/include/netinet/in.h (installed path)
+
+#include "../sys.h"
+#include "../int.h"
+
+struct in_addr {
+  uint32_t  s_addr;
+};
+
+#define __SOCK_SIZE__   16      /* sizeof(struct sockaddr)  */
+struct sockaddr_in {
+    unsigned short sin_family; // address family: AF_INET
+    uint16_t       sin_port;   // port in network byte order
+    struct in_addr sin_addr;   // internet address
+    // Padding to match the size of struct sockaddr
+    unsigned char  sin_zero[8];
+};
+/* Address to accept any incoming messages. */
+#define INADDR_ANY      ((unsigned long int) 0x00000000)
+
+/* Standard well-defined IP protocols.  */
+enum {
+  IPPROTO_IP = 0,       /* Dummy protocol for TCP       */
+  IPPROTO_ICMP = 1,     /* Internet Control Message Protocol    */
+  IPPROTO_IGMP = 2,     /* Internet Group Management Protocol   */
+  IPPROTO_IPIP = 4,     /* IPIP tunnels (older KA9Q tunnels use 94) */
+  IPPROTO_TCP = 6,      /* Transmission Control Protocol    */
+  IPPROTO_EGP = 8,      /* Exterior Gateway Protocol        */
+  IPPROTO_PUP = 12,     /* PUP protocol             */
+  IPPROTO_UDP = 17,     /* User Datagram Protocol       */
+  IPPROTO_IDP = 22,     /* XNS IDP protocol         */
+  IPPROTO_DCCP = 33,        /* Datagram Congestion Control Protocol */
+  IPPROTO_RSVP = 46,        /* RSVP protocol            */
+  IPPROTO_GRE = 47,     /* Cisco GRE tunnels (rfc 1701,1702)    */
+
+  IPPROTO_IPV6   = 41,      /* IPv6-in-IPv4 tunnelling      */
+
+  IPPROTO_ESP = 50,            /* Encapsulation Security Payload protocol */
+  IPPROTO_AH = 51,             /* Authentication Header protocol       */
+  IPPROTO_BEETPH = 94,         /* IP option pseudo header for BEET */
+  IPPROTO_PIM    = 103,     /* Protocol Independent Multicast   */
+
+  IPPROTO_COMP   = 108,                /* Compression Header protocol */
+  IPPROTO_SCTP   = 132,     /* Stream Control Transport Protocol    */
+
+  IPPROTO_RAW    = 255,     /* Raw IP packets           */
+  IPPROTO_MAX
+};
+
+#endif // MINIMAL_IPV4_H