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nettrace - skip over a single hopopts or dstops ipv6 extension header

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Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Iad7800387e1b84587794be93d037f712ac95fa07
This commit is contained in:
Maciej Żenczykowski 2023-09-13 06:09:01 +00:00
commit 73896a7b70
1 changed files with 10 additions and 0 deletions
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10
bpf_progs/netd.c
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@ -272,6 +272,16 @@ static __always_inline inline void do_packet_tracing(
(void)bpf_skb_load_bytes_net(skb, IP6_OFFSET(nexthdr), &proto, sizeof(proto), kver);
L4_off = sizeof(struct ipv6hdr);
ipVersion = 6;
// skip over a *single* HOPOPTS or DSTOPTS extension header (if present)
if (proto == IPPROTO_HOPOPTS || proto == IPPROTO_DSTOPTS) {
struct {
uint8_t proto, len;
} ext_hdr;
if (!bpf_skb_load_bytes_net(skb, L4_off, &ext_hdr, sizeof(ext_hdr), kver)) {
proto = ext_hdr.proto;
L4_off += (ext_hdr.len + 1) * 8;
}
}
}
uint8_t flags = 0;