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Introduce bpf tail call to increase the size of grpc parsing loop #978

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merged 7 commits into from
Jul 2, 2024
Merged

Introduce bpf tail call to increase the size of grpc parsing loop #978

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3ebf705
Add tail calls for kprobes
grcevski Jun 27, 2024
b91ed82
finish work for tail calls
grcevski Jun 27, 2024
690e212
Fix iov_len very large
grcevski Jun 27, 2024
86aa82b
merge main
grcevski Jun 27, 2024
dc2e55d
Fix ssl issue
grcevski Jun 27, 2024
5fdd8e8
Ensure we cleanup as the tail calls don't return
grcevski Jun 30, 2024
090e9b3
fix oats redis image
grcevski Jul 1, 2024
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1 change: 0 additions & 1 deletion bpf/http2_grpc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@
#include "bpf_endian.h"
#include "http_types.h"

#define MIN_HTTP2_SIZE 24 // Preface PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n https://datatracker.ietf.org/doc/html/rfc7540#section-3.5
#define HTTP2_GRPC_PREFACE "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"

#define FRAME_HEADER_LEN 9
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6 changes: 4 additions & 2 deletions bpf/http_sock.c
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Expand Up @@ -306,7 +306,7 @@ int BPF_KPROBE(kprobe_tcp_sendmsg, struct sock *sk, struct msghdr *msg, size_t s
u64 sock_p = (u64)sk;
bpf_map_update_elem(&active_send_args, &id, &s_args, BPF_ANY);
bpf_map_update_elem(&active_send_sock_args, &sock_p, &s_args, BPF_ANY);
handle_buf_with_connection(&s_args.p_conn, buf, size, NO_SSL, TCP_SEND, orig_dport);
handle_buf_with_connection(ctx, &s_args.p_conn, buf, size, NO_SSL, TCP_SEND, orig_dport);
} else {
bpf_dbg_printk("can't find iovec ptr in msghdr, not tracking sendmsg");
}
Expand Down Expand Up @@ -468,7 +468,9 @@ int BPF_KRETPROBE(kretprobe_tcp_recvmsg, int copied_len) {
if (buf) {
copied_len = read_msghdr_buf((void *)args->iovec_ptr, buf, copied_len);
if (copied_len) {
handle_buf_with_connection(&info, buf, copied_len, NO_SSL, TCP_RECV, orig_dport);
handle_buf_with_connection(ctx, &info, buf, copied_len, NO_SSL, TCP_RECV, orig_dport);
} else {
bpf_dbg_printk("Not copied anything");
}
}
} else {
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