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Fix prioritized VLAN redirect rewriting

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This commit is contained in:
Herbert Wolverson committed 2026-08-20 14:48:33 -05:00
1 parent 750560a14d
commit 7e4a4cda65
1 file changed
+7 -3
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src/rust/lqos_sys/src/bpf/common/dissector.h
+7 -3
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@@ -181,6 +181,7 @@ static __always_inline bool dissector_find_l3_offset(
}
struct vlan_hdr *vlan = (struct vlan_hdr *)(dissector->start + offset);
dissector->current_vlan = vlan->h_vlan_TCI;
__u16 vlan_tci = bpf_ntohs(dissector->current_vlan);
eth_type = bpf_ntohs(vlan->h_vlan_encapsulated_proto);
offset += sizeof(struct vlan_hdr);
// VLAN Redirection is requested, so lookup a detination and
@@ -190,19 +191,22 @@ static __always_inline bool dissector_find_l3_offset(
#ifdef VERBOSE
bpf_debug("Searching for redirect %u:%u",
dissector->ctx->ingress_ifindex,
bpf_ntohs(dissector->current_vlan));
vlan_tci);
#endif
__u32 key = (dissector->ctx->ingress_ifindex << 16) |
bpf_ntohs(dissector->current_vlan);
(vlan_tci & 0x0FFF);
struct bifrost_vlan *vlan_info = NULL;
vlan_info = bpf_map_lookup_elem(&bifrost_vlan_map, &key);
if (vlan_info)
{
vlan_tci = bpf_ntohs(dissector->current_vlan);
#ifdef VERBOSE
bpf_debug("Redirect to VLAN %u",
bpf_htons(vlan_info->redirect_to));
#endif
vlan->h_vlan_TCI = bpf_htons(vlan_info->redirect_to);
vlan->h_vlan_TCI = bpf_htons(
(vlan_tci & 0xF000) |
(vlan_info->redirect_to & 0x0FFF));
}
}
}