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Adjust tcp-retransmit example #335

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Dec 6, 2023
Merged

Adjust tcp-retransmit example #335

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94 changes: 46 additions & 48 deletions examples/tcp-retransmit.bpf.c
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Open in desktop
Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#include "maps.bpf.h"

#define MAX_ENTRIES 8192
Expand All @@ -17,15 +16,15 @@
struct ipv4_key_t {
u32 saddr;
u32 daddr;
u16 mainport;
u32 type;
u16 main_port;
u8 type;
};

struct ipv6_key_t {
u8 saddr[16];
u8 daddr[16];
u16 mainport;
u32 type;
u16 main_port;
u8 type;
};

struct {
Expand All @@ -42,60 +41,59 @@ struct {
__type(value, u64);
} tcp_retransmit_ipv6_packets_total SEC(".maps");

static int trace_event(const struct sock *sk, u32 type)
static int extract_main_port(const struct sock *sk)
{
u32 family = sk->__sk_common.skc_family;
u16 sport = sk->__sk_common.skc_num;
u16 dport = __builtin_bswap16(sk->__sk_common.skc_dport);

if (family == AF_INET) {
struct ipv4_key_t key;
__builtin_memset(&key, 0, sizeof(key));

key.saddr = sk->__sk_common.skc_rcv_saddr;
key.daddr = sk->__sk_common.skc_daddr;

u16 sport = sk->__sk_common.skc_num;
u16 dport = sk->__sk_common.skc_dport;
dport = __builtin_bswap16(dport);

if (sport <= dport) {
key.mainport = sport;
} else {
key.mainport = dport;
}
if (sport > UPPER_PORT_BOUND && dport > UPPER_PORT_BOUND) {
return 0;
}

if (key.mainport >= UPPER_PORT_BOUND) {
key.mainport = 0;
}
if (sport < dport) {
return sport;
}

key.type = type;
return dport;
}

increment_map(&tcp_retransmit_ipv4_packets_total, &key, 1);
#define TRACE_PROTOCOL(key_type, map, ip_extractor) \
key_type key = {}; \
\
key.type = type; \
key.main_port = extract_main_port(sk); \
\
ip_extractor; \
\
increment_map(map, &key, 1); \
\
return 0;

} else if (family == AF_INET6) {
struct ipv6_key_t key;
__builtin_memset(&key, 0, sizeof(key));
static int trace_ipv4(const struct sock *sk, u8 type)
{
TRACE_PROTOCOL(struct ipv4_key_t, &tcp_retransmit_ipv4_packets_total, {
key.saddr = sk->__sk_common.skc_rcv_saddr;
key.daddr = sk->__sk_common.skc_daddr;
});
}

static int trace_ipv6(const struct sock *sk, u8 type)
{
TRACE_PROTOCOL(struct ipv6_key_t, &tcp_retransmit_ipv6_packets_total, {
bpf_probe_read_kernel(&key.saddr, sizeof(key.saddr), sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32);
bpf_probe_read_kernel(&key.daddr, sizeof(key.daddr), sk->__sk_common.skc_v6_daddr.in6_u.u6_addr32);
});
}

u16 sport = sk->__sk_common.skc_num;
u16 dport = sk->__sk_common.skc_dport;
dport = __builtin_bswap16(dport);

if (sport <= dport) {
key.mainport = sport;
} else {
key.mainport = dport;
}

if (key.mainport >= UPPER_PORT_BOUND) {
key.mainport = 0;
}

key.type = type;

increment_map(&tcp_retransmit_ipv6_packets_total, &key, 1);
static int trace_event(const struct sock *sk, u8 type)
{
switch (sk->__sk_common.skc_family) {
case AF_INET:
return trace_ipv4(sk, type);
case AF_INET6:
return trace_ipv6(sk, type);
}

return 0;
}

Expand Down
94 changes: 47 additions & 47 deletions examples/tcp-retransmit.yaml
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Original file line number Diff line number Diff line change
@@ -1,48 +1,48 @@
metrics:
counters:
- name: tcp_retransmit_ipv4_packets_total
help: Total count of IPv4 TCP retransmissions
labels:
- name: local_ip
size: 4
decoders:
- name: inet_ip
- name: peer_ip
size: 4
decoders:
- name: inet_ip
- name: main_port
size: 4
decoders:
- name: uint
- name: type
size: 4
decoders:
- name: uint
- name: static_map
static_map:
1: retransmit
2: tail_loss_probe
- name: tcp_retransmit_ipv6_packets_total
help: Total count of IPv6 TCP retransmissions
labels:
- name: local_ip
size: 16
decoders:
- name: inet_ip
- name: peer_ip
size: 16
decoders:
- name: inet_ip
- name: main_port
size: 4
decoders:
- name: uint
- name: type
size: 4
decoders:
- name: uint
- name: static_map
static_map:
1: retransmit
2: tail_loss_probe
counters:
- name: tcp_retransmit_ipv4_packets_total
help: Total count of IPv4 TCP retransmissions
labels:
- name: local_ip
size: 4
decoders:
- name: inet_ip
- name: peer_ip
size: 4
decoders:
- name: inet_ip
- name: main_port
size: 2
decoders:
- name: uint
- name: type
size: 2
decoders:
- name: uint
- name: static_map
static_map:
1: retransmit
2: tail_loss_probe
- name: tcp_retransmit_ipv6_packets_total
help: Total count of IPv6 TCP retransmissions
labels:
- name: local_ip
size: 16
decoders:
- name: inet_ip
- name: peer_ip
size: 16
decoders:
- name: inet_ip
- name: main_port
size: 2
decoders:
- name: uint
- name: type
size: 2
decoders:
- name: uint
- name: static_map
static_map:
1: retransmit
2: tail_loss_probe