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invert conditionals, removing crazy nesting
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Thank you code aesthetic
This commit is contained in:
Steven Polley 2024-05-09 20:17:02 -06:00
parent 390fabe1b4
commit b318bcb3c1
1 changed files with 28 additions and 19 deletions
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47
hypd/server/hyp_bpf.c
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@ -40,26 +40,35 @@ int xdp_prog_func(struct xdp_md *ctx) {
// parse ethernet header // parse ethernet header
struct ethhdr *eth = data; struct ethhdr *eth = data;
if ((void *)eth + sizeof(*eth) <= data_end) { if ((void *)eth + sizeof(*eth) > data_end) {
// parse IP header return XDP_PASS;
struct iphdr *ip = data + sizeof(*eth);
if ((void *)ip + sizeof(*ip) <= data_end) {
if (ip->protocol == IPPROTO_UDP) {
// parse UDP header
struct udphdr *udp = (void *)ip + sizeof(*ip);
if ((void *)udp + sizeof(*udp) <= data_end)
{
// pack into knock structure and send to userspace
struct knock_data knock = {
.srcip = bpf_ntohl(ip->saddr),
.dstport = bpf_htons(udp->dest),
.pad = 0
};
bpf_ringbuf_output(&rb, &knock, sizeof(knock), BPF_RB_FORCE_WAKEUP);
}
}
}
} }
// parse IP header
struct iphdr *ip = data + sizeof(*eth);
if ((void *)ip + sizeof(*ip) > data_end) {
return XDP_PASS;
}
// Ensure IP header protocol field is UDP (protocol 17)
if (ip->protocol != IPPROTO_UDP) {
return XDP_PASS;
}
// parse UDP header
struct udphdr *udp = (void *)ip + sizeof(*ip);
if ((void *)udp + sizeof(*udp) > data_end) {
return XDP_PASS;
}
// pack into knock structure and send to userspace
struct knock_data knock = {
.srcip = bpf_ntohl(ip->saddr),
.dstport = bpf_htons(udp->dest),
.pad = 0
};
bpf_ringbuf_output(&rb, &knock, sizeof(knock), BPF_RB_FORCE_WAKEUP);
// We send everything to XDP_PASS // We send everything to XDP_PASS
return XDP_PASS; return XDP_PASS;
} }