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Payload increased length now being correctly recognized, but still cannot write to it yet.

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h3xduck
2021-11-25 06:36:32 -05:00
parent 442f955cf5
commit 253c302695
6 changed files with 641 additions and 421 deletions
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13
src/ebpf/xdp_filter.bpf.c
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@@ -127,19 +127,19 @@ int xdp_receive(struct xdp_md *ctx)
//We must check bounds again, otherwise the verifier gets angry
data = (void*)(long)ret.ret_md.data;
data_end = (void*)(long)ret.ret_md.data_end;
eth = data;
eth = ret.eth;
if(ethernet_header_bound_check(eth, data_end)<0){
bpf_printk("Bound check A failed while expanding\n");
return XDP_PASS;
}
ip = data + sizeof(*eth);
ip = ret.ip;
if (ip_header_bound_check(ip, data_end)<0){
bpf_printk("Bound check B failed while expanding\n");
return XDP_PASS;
}
tcp = (void *)ip + sizeof(*ip);
tcp = ret.tcp;
/*if (get_protocol(data_end) != IPPROTO_TCP){
bpf_printk("Bound check C failed while expanding\n");
return XDP_PASS;
@@ -163,8 +163,11 @@ int xdp_receive(struct xdp_md *ctx)
}
data_len_next = data_end-data;
bpf_printk("Previous length: %i, current length: %i\n", data_len_prev, data_len_next);
//payload[4] = 'A';
//payload[6] = '\0';
//char payload_to_write[] = "hello";
//__builtin_memcpy(payload, payload_to_write, strlen(payload_to_write));
//payload[5] = '\0';
//payload[1] = 'b';
/*if(!payload){
bpf_probe_read_str(&rb_event->payload, sizeof(rb_event->payload), (void *)payload);