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bpf: clat: improve debug messages

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This commit is contained in:
Beniamino Galvani 2025-12-17 18:25:12 +01:00
parent 5d93f782d3
commit e249d725fe
1 changed files with 11 additions and 4 deletions
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15
src/core/bpf/clat.bpf.c
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@ -35,6 +35,9 @@ char _license[] SEC("license") = "GPL";
struct clat_config config;
#ifdef DEBUG
/* Note: when enabling debugging, you also need to add CAP_PERFMON
* to the CapabilityBoundingSet of the NM systemd unit. The messages
* will be printed to /sys/kernel/debug/tracing/trace_pipe */
#define DBG(fmt, ...) \
({ \
char ____fmt[] = "clat: " fmt; \
@ -502,8 +505,8 @@ clat_handle_v4(struct __sk_buff *skb)
if (iph->ihl != 5 || (iph->frag_off & ~bpf_htons(1 << 14))) {
DBG("v4: pkt src/dst %pI4/%pI4 has IP options or is fragmented, dropping\n",
&iph->daddr,
&iph->saddr);
&iph->saddr,
&iph->daddr);
goto out;
}
@ -518,7 +521,7 @@ clat_handle_v4(struct __sk_buff *skb)
dst_hdr.flow_lbl[0] = iph->tos << 4;
dst_hdr.payload_len = bpf_htons(bpf_ntohs(iph->tot_len) - sizeof(struct iphdr));
DBG("v4: Found mapping for dst %pI4 to %pI6c\n", &iph->daddr, &dst_hdr.daddr);
DBG("v4: outgoing pkt to dst %pI4 (%pI6c)\n", &iph->daddr, &dst_hdr.daddr);
switch (dst_hdr.nexthdr) {
case IPPROTO_ICMP:
@ -934,8 +937,12 @@ clat_handle_v6(struct __sk_buff *skb)
/* drop packets with extension headers */
if (ip6h->nexthdr != IPPROTO_TCP && ip6h->nexthdr != IPPROTO_UDP
&& ip6h->nexthdr != IPPROTO_ICMPV6)
&& ip6h->nexthdr != IPPROTO_ICMPV6) {
DBG("v6: pkt src/dst %pI6c/%pI6c has nexthdr %u, dropping\n", &ip6h->saddr, &ip6h->daddr);
goto out;
}
DBG("v6: incoming pkt from src %pI6c (%pI4)\n", &ip6h->saddr, &addr4);
translate_ipv6_header(ip6h, &dst_hdr, addr4, config.local_v4.s_addr);