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Finished externalizing helper functions

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h3xduck
2021-11-24 10:50:30 -05:00
parent 72fddcac62
commit 0568d5192d
8 changed files with 318 additions and 276 deletions
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31
src/ebpf/xdp_filter.bpf.c
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@@ -1,28 +1,28 @@
//#include "newvmlinux.h"
#include <linux/ip.h>
#include <linux/types.h>
#include <unistd.h>
#include <stdbool.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/bpf.h>
#include <stdbool.h>
#include <linux/ip.h>
#include <linux/types.h>
#include <linux/unistd.h>
#include <linux/if_ether.h>
#include <linux/pkt_cls.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#include <arpa/inet.h>
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#include "../user/xdp_filter.h"
#include "../constants/constants.h"
#include "../include/packet_manager.h"
#include "../include/packet/packet_manager.h"
char LICENSE[] SEC("license") = "Dual BSD/GPL";
@@ -62,29 +62,27 @@ int xdp_receive(struct xdp_md *ctx)
unsigned char *payload;
struct tcphdr *tcp;
struct iphdr *ip;
if ((void *)eth + sizeof(*eth) > data_end){
return XDP_PASS;
}
//Bound checking the packet before operating with it
//Otherwise the bpf verifier will complain
if(ethernet_header_bound_check(eth, data_end)<0){
bpf_printk("Bound check fail A");
return XDP_PASS;
}
ip = data + sizeof(*eth);
if ((void *)ip + sizeof(*ip) > data_end){
if (ip_header_bound_check(ip, data_end)<0){
bpf_printk("B");
return XDP_PASS;
}
if (ip->protocol != IPPROTO_TCP){
if (get_protocol(data) != IPPROTO_TCP){
bpf_printk("C");
return XDP_PASS;
}
tcp = (void *)ip + sizeof(*ip);
if ((void *)tcp + sizeof(*tcp) > data_end){
if (tcp_header_bound_check(tcp, data_end)){
bpf_printk("D");
return XDP_PASS;
}
@@ -136,3 +134,4 @@ int xdp_receive(struct xdp_md *ctx)