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Refactored packet API to support struct layer (using union to contain different types of encapsulation headers)

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This commit is contained in:
luwenpeng
2024-06-14 19:24:27 +08:00
parent 1f78881cbb
commit de4c15f43c
47 changed files with 834 additions and 701 deletions
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1
include/CMakeLists.txt
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@@ -1,4 +1,5 @@
install(FILES stellar/utils.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
install(FILES stellar/layer.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
install(FILES stellar/packet.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
install(FILES stellar/session.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
install(FILES stellar/stellar.h DESTINATION include/stellar/ COMPONENT LIBRARIES)

99
include/stellar/layer.h Normal file
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@@ -0,0 +1,99 @@
#ifndef _LAYER_H
#define _LAYER_H
#ifdef __cplusplus
extern "C"
{
#endif
#define __FAVOR_BSD 1
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet/ip_icmp.h>
#include <linux/if_ether.h>
#include <linux/mpls.h>
enum layer_proto
{
LAYER_PROTO_NONE = 0,
// L2 -- data link layer
LAYER_PROTO_ETHER = 1,
LAYER_PROTO_PWETH = 2,
LAYER_PROTO_PPP = 3,
LAYER_PROTO_L2TP = 4,
// L2 -- tunnel
LAYER_PROTO_VLAN = 21,
LAYER_PROTO_PPPOE = 22,
LAYER_PROTO_MPLS = 23,
// L3 -- network layer
LAYER_PROTO_IPV4 = 31,
LAYER_PROTO_IPV6 = 32,
LAYER_PROTO_IPAH = 33,
// L3 -- tunnel
LAYER_PROTO_GRE = 41,
// L4 -- transport layer
LAYER_PROTO_UDP = 51,
LAYER_PROTO_TCP = 52,
LAYER_PROTO_ICMP = 53,
LAYER_PROTO_ICMP6 = 54,
// L4 -- tunnel
LAYER_PROTO_VXLAN = 61,
LAYER_PROTO_GTPV1_U = 62,
};
struct layer
{
enum layer_proto proto;
uint16_t payload_len;
uint16_t header_len;
union
{
struct ethhdr *eth;
struct ip *ip4;
struct ip6_hdr *ip6;
struct tcphdr *tcp;
struct udphdr *udp;
struct icmphdr *icmp4;
struct icmp6_hdr *icmp6;
struct mpls_label *mpls;
const char *raw;
} header;
const char *payload;
};
int packet_get_layer_count(const struct packet *pkt);
// return 0: success 
// return -1: failed
int packet_get_layer(const struct packet *pkt, int idx, struct layer *out);
#define PACKET_FOREACH_LAYER_INORDER(pkt, layer) \
for (int i = 0; i < packet_get_layer_count(pkt) && packet_get_layer(pkt, i, &layer) == 0; i++)
#define PACKET_FOREACH_LAYER_REVERSE(pkt, layer) \
for (int i = packet_get_layer_count(pkt) - 1; i >= 0 && packet_get_layer(pkt, i, &layer) == 0; i--)
#define PACKET_GETALL_LAYERS(pkt, layers) \
{ \
int size = sizeof(layers) / sizeof(layers[0]); \
int num = packet_get_layer_count(pkt); \
if (num > size) \
num = size; \
for (int i = 0; i < num && packet_get_layer(pkt, i, &layers[i]) == 0; i++) \
/* void */; \
return num; \
}
#ifdef __cplusplus
}
#endif
#endif

165
include/stellar/packet.h
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@@ -1,179 +1,44 @@
#ifndef _PACKET_PUB_H
#define _PACKET_PUB_H
#ifndef _PACKET_H
#define _PACKET_H
#ifdef __cplusplus
extern "C"
{
#endif
#include <string.h>
#include <arpa/inet.h>
#define __FAVOR_BSD 1
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <stdint.h>
enum layer_proto
#define MAX_SIDS 8
struct sids
{
LAYER_PROTO_NONE = 0,
// L2 -- data link layer
LAYER_PROTO_ETHER = 1,
LAYER_PROTO_PWETH = 2,
LAYER_PROTO_PPP = 3,
LAYER_PROTO_L2TP = 4,
// L2 -- tunnel
LAYER_PROTO_VLAN = 21,
LAYER_PROTO_PPPOE = 22,
LAYER_PROTO_MPLS = 23,
// L3 -- network layer
LAYER_PROTO_IPV4 = 31,
LAYER_PROTO_IPV6 = 32,
LAYER_PROTO_IPAH = 33,
// L3 -- tunnel
LAYER_PROTO_GRE = 41,
// L4 -- transport layer
LAYER_PROTO_UDP = 51,
LAYER_PROTO_TCP = 52,
LAYER_PROTO_ICMP = 53,
LAYER_PROTO_ICMP6 = 54,
// L4 -- tunnel
LAYER_PROTO_VXLAN = 61,
LAYER_PROTO_GTPV1_U = 62,
};
struct raw_layer
{
enum layer_proto type;
const char *hdr_ptr; // header pointer
const char *pld_ptr; // payload pointer
uint16_t hdr_offset; // header offset from data_ptr
uint16_t hdr_len; // header length
uint16_t pld_len; // payload length
};
#define MAX_SID_NUM 8
struct sid_list
{
uint16_t sid[MAX_SID_NUM];
uint16_t sid[MAX_SIDS];
int used;
};
void packet_prepend_sids(struct packet *pkt, const struct sids *sids);
enum packet_direction
{
PACKET_DIRECTION_OUTGOING = 0, // Internal -> External: 0
PACKET_DIRECTION_INCOMING = 1, // External -> Internal: 1
};
enum packet_direction packet_get_direction(const struct packet *pkt);
enum packet_action
{
PACKET_ACTION_FORWARD = 0,
PACKET_ACTION_FORWARD = 0, // must be zero
PACKET_ACTION_DROP = 1,
PACKET_ACTION_DEFER = 2, // TODO
};
enum packet_direction packet_get_direction(const struct packet *pkt);
uint64_t packet_get_session_id(const struct packet *pkt);
void packet_prepend_sid_list(struct packet *pkt, const struct sid_list *list);
int packet_get_layer_count(const struct packet *pkt);
const struct raw_layer *packet_get_raw_layer(const struct packet *pkt, int idx);
const char *packet_get_data(const struct packet *pkt);
uint16_t packet_get_len(const struct packet *pkt);
const char *packet_get_payload(const struct packet *pkt);
uint16_t packet_get_payload_len(const struct packet *pkt);
void packet_set_action(struct packet *pkt, enum packet_action action);
enum packet_action packet_get_action(const struct packet *pkt);
struct address
{
uint8_t family; // AF_INET or AF_INET6
union
{
struct in_addr v4; /* network order */
struct in6_addr v6; /* network order */
} data;
};
uint64_t packet_get_session_id(const struct packet *pkt);
static inline int packet_get_addr(const struct packet *pkt, struct address *src_addr, struct address *dst_addr)
{
const struct ip *ip4_hdr = NULL;
const struct ip6_hdr *ip6_hdr = NULL;
const struct raw_layer *layer = NULL;
int num = packet_get_layer_count(pkt);
for (int i = num - 1; i >= 0; i--)
{
layer = packet_get_raw_layer(pkt, i);
if (layer->type == LAYER_PROTO_IPV4)
{
ip4_hdr = (const struct ip *)layer->hdr_ptr;
if (src_addr != NULL)
{
src_addr->family = AF_INET;
src_addr->data.v4.s_addr = ip4_hdr->ip_src.s_addr;
}
if (dst_addr != NULL)
{
dst_addr->family = AF_INET;
dst_addr->data.v4.s_addr = ip4_hdr->ip_dst.s_addr;
}
return 0;
}
if (layer->type == LAYER_PROTO_IPV6)
{
ip6_hdr = (const struct ip6_hdr *)layer->hdr_ptr;
if (src_addr != NULL)
{
src_addr->family = AF_INET6;
src_addr->data.v6 = ip6_hdr->ip6_src;
}
if (dst_addr != NULL)
{
dst_addr->family = AF_INET6;
dst_addr->data.v6 = ip6_hdr->ip6_dst;
}
return 0;
}
}
const char *packet_get_raw_data(const struct packet *pkt);
uint16_t packet_get_raw_len(const struct packet *pkt);
return -1;
}
static inline int packet_get_port(const struct packet *pkt, uint16_t *src_port, uint16_t *dst_port)
{
const struct tcphdr *tcp_hdr = NULL;
const struct udphdr *udp_hdr = NULL;
const struct raw_layer *layer = NULL;
int num = packet_get_layer_count(pkt);
for (int i = num - 1; i >= 0; i--)
{
layer = packet_get_raw_layer(pkt, i);
if (layer->type == LAYER_PROTO_TCP)
{
tcp_hdr = (const struct tcphdr *)layer->hdr_ptr;
src_port != NULL ? *src_port = tcp_hdr->th_sport : 0;
dst_port != NULL ? *dst_port = tcp_hdr->th_dport : 0;
return 0;
}
if (layer->type == LAYER_PROTO_UDP)
{
udp_hdr = (const struct udphdr *)layer->hdr_ptr;
src_port != NULL ? *src_port = udp_hdr->uh_sport : 0;
dst_port != NULL ? *dst_port = udp_hdr->uh_dport : 0;
return 0;
}
}
return -1;
}
const char *packet_get_payload(const struct packet *pkt);
uint16_t packet_get_payload_len(const struct packet *pkt);
#ifdef __cplusplus
}

2
include/stellar/session.h
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@@ -133,7 +133,7 @@ enum session_type session_get_type(const struct session *sess);
enum session_state session_get_current_state(const struct session *sess);
const struct packet *session_get0_current_packet(const struct session *sess);
const char *session_get0_current_payload(const struct session *sess, size_t *payload_len);
const char *session_get0_current_payload(const struct session *sess, uint16_t *payload_len);
enum closing_reason session_get_closing_reason(const struct session *sess);
enum session_direction session_get_direction(const struct session *sess);

2
include/stellar/stellar.h
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@@ -56,7 +56,7 @@ int stellar_inject_tcp_rst(struct stellar *st, const struct session *sess, enum
int stellar_inject_tcp_fin(struct stellar *st, const struct session *sess, enum flow_direction inject_dir);
int stellar_inject_tcp_payload(struct stellar *st, const struct session *sess, enum flow_direction inject_dir, const char *payload, uint16_t len);
int stellar_inject_udp_payload(struct stellar *st, const struct session *sess, enum flow_direction inject_dir, const char *payload, uint16_t len);
int stellar_inject_ctrl_msg(struct stellar *st, const struct session *sess, const struct sid_list *sids, const char *msg, uint16_t len);
int stellar_inject_ctrl_msg(struct stellar *st, const struct session *sess, const struct sids *sids, const char *msg, uint16_t len);
int stellar_main(int argc, char **argv);