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tracing: Tracepoints for in- and outbound P2P msgs

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Can be used to monitor in- and outbound node traffic.

Based on ealier work by jb55.

Co-authored-by: William Casarin <jb55@jb55.com>
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2021-05-20 16:54:54 +02:00
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doc/tracing.md
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@@ -53,6 +53,46 @@ be found in [contrib/tracing].
The currently available tracepoints are listed here.
### Context `net`
#### Tracepoint `net:inbound_message`
Is called when a message is received from a peer over the P2P network. Passes
information about our peer, the connection and the message as arguments.
Arguments passed:
1. Peer ID as `int64`
2. Peer Address and Port (IPv4, IPv6, Tor v3, I2P, ...) as `pointer to C-style String` (max. length 68 characters)
3. Connection Type (inbound, feeler, outbound-full-relay, ...) as `pointer to C-style String` (max. length 20 characters)
4. Message Type (inv, ping, getdata, addrv2, ...) as `pointer to C-style String` (max. length 20 characters)
5. Message Size in bytes as `uint64`
6. Message Bytes as `pointer to unsigned chars` (i.e. bytes)
Note: The message is passed to the tracepoint in full, however, due to space
limitations in the eBPF kernel VM it might not be possible to pass the message
to user-space in full. Messages longer than a 32kb might be cut off. This can
be detected in tracing scripts by comparing the message size to the length of
the passed message.
#### Tracepoint `net:outbound_message`
Is called when a message is send to a peer over the P2P network. Passes
information about our peer, the connection and the message as arguments.
Arguments passed:
1. Peer ID as `int64`
2. Peer Address and Port (IPv4, IPv6, Tor v3, I2P, ...) as `pointer to C-style String` (max. length 68 characters)
3. Connection Type (inbound, feeler, outbound-full-relay, ...) as `pointer to C-style String` (max. length 20 characters)
4. Message Type (inv, ping, getdata, addrv2, ...) as `pointer to C-style String` (max. length 20 characters)
5. Message Size in bytes as `uint64`
6. Message Bytes as `pointer to unsigned chars` (i.e. bytes)
Note: The message is passed to the tracepoint in full, however, due to space
limitations in the eBPF kernel VM it might not be possible to pass the message
to user-space in full. Messages longer than a 32kb might be cut off. This can
be detected in tracing scripts by comparing the message size to the length of
the passed message.
## Adding tracepoints to Bitcoin Core
To add a new tracepoint, `#include <util/trace.h>` in the compilation unit where