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ebpf fix
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malmert
2026-03-07 15:43:07 +01:00
parent 5aac5974f5
commit 6ad2dd2435
1 changed files with 12 additions and 4 deletions
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16
tools/ebpf/mark_packet_id.c
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@@ -5,21 +5,29 @@
#define PACKET_ID_MASK 0x0FFFFFFF #define PACKET_ID_MASK 0x0FFFFFFF
#define VERDICT_MASK 0xF0000000 #define VERDICT_MASK 0xF0000000
struct counter_state {
struct bpf_spin_lock lock;
__u32 value;
};
struct { struct {
__uint(type, BPF_MAP_TYPE_ARRAY); __uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1); __uint(max_entries, 1);
__type(key, __u32); __type(key, __u32);
__type(value, __u32); __type(value, struct counter_state);
} packet_counter SEC(".maps"); } packet_counter SEC(".maps");
SEC("classifier") SEC("classifier")
int classifier(struct __sk_buff *skb) { int classifier(struct __sk_buff *skb) {
__u32 key = 0; __u32 key = 0;
__u32 *counter = bpf_map_lookup_elem(&packet_counter, &key); struct counter_state *state = bpf_map_lookup_elem(&packet_counter, &key);
__u32 next = 1; __u32 next = 1;
if (counter) { if (state) {
next = __sync_add_and_fetch(counter, 1); bpf_spin_lock(&state->lock);
state->value += 1;
next = state->value;
bpf_spin_unlock(&state->lock);
} }
skb->mark = (skb->mark & VERDICT_MASK) | (next & PACKET_ID_MASK); skb->mark = (skb->mark & VERDICT_MASK) | (next & PACKET_ID_MASK);