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fix the c form of the xdp program

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varun-r-mallya
2025-11-27 23:44:44 +05:30
parent de8c486461
commit 5ba29db362
1 changed files with 16 additions and 19 deletions
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35
tests/c-form/xdp_test.bpf.c
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@ -1,19 +1,18 @@
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <linux/bpf.h> #include <linux/bpf.h>
#include <linux/if_ether.h> #include <linux/if_ether.h>
#include <linux/ip.h> #include <linux/ip.h>
#include <bpf/bpf_helpers.h>
struct fake_iphdr { struct fake_iphdr {
unsigned short useless; unsigned short useless;
unsigned short tot_len; unsigned short tot_len;
unsigned short id; unsigned short id;
unsigned short frag_off; unsigned short frag_off;
unsigned char ttl; unsigned char ttl;
unsigned char protocol; unsigned char protocol;
unsigned short check; unsigned short check;
unsigned int saddr; unsigned int saddr;
unsigned int daddr; unsigned int daddr;
}; };
SEC("xdp") SEC("xdp")
@ -21,16 +20,14 @@ int xdp_prog(struct xdp_md *ctx) {
unsigned long data = ctx->data; unsigned long data = ctx->data;
unsigned long data_end = ctx->data_end; unsigned long data_end = ctx->data_end;
if (data + sizeof(struct ethhdr) + sizeof(struct fake_iphdr) <= data_end) { if (data + sizeof(struct ethhdr) + sizeof(struct fake_iphdr) > data_end) {
struct fake_iphdr *iph = (void *)data + sizeof(struct ethhdr);
bpf_printk("%d", iph->saddr);
return XDP_PASS;
} else {
return XDP_ABORTED; return XDP_ABORTED;
} }
struct task_struct * a = btf_bpf_get_current_task_btf(); struct fake_iphdr *iph = (void *)data + sizeof(struct ethhdr);
bpf_printk("%d", iph->saddr);
return XDP_PASS;
} }
char _license[] SEC("license") = "GPL"; char _license[] SEC("license") = "GPL";