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Kernel module basic ipv4 with debug settings

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This commit is contained in:
Vadim Vetrov
2024-09-01 16:07:47 +03:00
parent 0a679ea41c
commit 27629ba0cc
9 changed files with 397 additions and 278 deletions
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57
types.h
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@@ -3,7 +3,7 @@
#define TYPES_H
#include <asm/byteorder.h>
#ifdef KERNEL_SCOPE
#ifdef KERNEL_SPACE
#include <linux/errno.h> // IWYU pragma: export
#include <linux/string.h> // IWYU pragma: export
@@ -12,17 +12,17 @@ typedef __u8 uint8_t;
typedef __u16 uint16_t;
typedef __u32 uint32_t;
typedef __u64 uint64_t;
typedef __i8 int8_t;
typedef __i16 int16_t;
typedef __i32 int32_t;
typedef __i64 int64_t;
#else /* USERSPACE_SCOPE */
//typedef __i8 int8_t;
//typedef __i16 int16_t;
//typedef __i32 int32_t;
//typedef __i64 int64_t;
#else /* USER_SPACE */
#include <errno.h> // IWYU pragma: export
#include <stdint.h> // IWYU pragma: export
#include <string.h> // IWYU pragma: export
#endif /* SCOPES */
#endif /* SPACES */
// Network specific structures
#ifdef KERNEL_SPACE
@@ -30,15 +30,35 @@ typedef __i64 int64_t;
#include <linux/net.h> // IWYU pragma: export
#include <linux/in.h> // IWYU pragma: export
#include <linux/ip.h> // IWYU pragma: export
#include <linux/ipv6.h> // IWYU pragma: export
#include <linux/tcp.h> // IWYU pragma: export
#define ip6_hdr ipv6hdr
/* from <netinet/ip.h> */
#define IP_RF 0x8000 /* reserved fragment flag */
#define IP_DF 0x4000 /* dont fragment flag */
#define IP_MF 0x2000 /* more fragments flag */
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
#ifdef __LITTLE_ENDIAN
#define __BIG_ENDIAN 4321
#define __BYTE_ORDER __LITTLE_ENDIAN
#elif defined(__BIG_ENDIAN)
#define __LITTLE_ENDIAN 1234
#define __BYTE_ORDER __BIG_ENDIAN
#else
#define USER_SPACE
#error "Unsupported endian"
#endif
#define ip6_plen payload_len
#define ip6_nxt nexthdr
#define ip6_hops hop_limit
#define ip6_hlim hop_limit
#define ip6_src saddr
#define ip6_dst daddr
#else /* USER_SPACE */
#include <arpa/inet.h> // IWYU pragma: export
#include <netinet/ip.h> // IWYU pragma: export
#include <netinet/ip6.h> // IWYU pragma: export
@@ -46,6 +66,8 @@ typedef __i64 int64_t;
#include <netinet/udp.h> // IWYU pragma: export
#endif
#ifndef KERNEL_SPACE
#define max(a,b)__extension__\
({ \
__typeof__ (a) _a = (a); \
@@ -60,4 +82,23 @@ typedef __i64 int64_t;
_a < _b ? _a : _b; \
})
#endif /* not a KERNEL_SPACE */
/**
* Use NETBUF_ALLOC and NETBUF_FREE as an abstraction of memory allocation.
* Do not use it within expressions, consider these defines as separate statements.
*
* Use NETBUF_CHECK to check that buffer was properly allocated.
*/
#ifdef KERNEL_SPACE
#include <linux/gfp_types.h>
#define NETBUF_ALLOC(buf, buf_len) __u8* buf = kmalloc(buf_len, GFP_ATOMIC);
#define NETBUF_CHECK(buf) ((buf) != NULL)
#define NETBUF_FREE(buf) kfree(buf);
#else
#define NETBUF_ALLOC(buf, buf_len) __u8 buf[buf_len];
#define NETBUF_CHECK(buf) (1)
#define NETBUF_FREE(buf) ;
#endif
#endif /* TYPES_H */