From c2cb5e82a720c05b707701c75dfeb356fe184787 Mon Sep 17 00:00:00 2001 From: Stanislav Fomichev Date: Tue, 2 Jul 2019 09:13:59 -0700 Subject: bpf: add icsk_retransmits to bpf_tcp_sock Add some inet_connection_sock fields to bpf_tcp_sock that might be useful for debugging congestion control issues. Cc: Eric Dumazet Cc: Priyaranjan Jha Cc: Yuchung Cheng Cc: Soheil Hassas Yeganeh Acked-by: Soheil Hassas Yeganeh Acked-by: Yuchung Cheng Signed-off-by: Stanislav Fomichev Signed-off-by: Daniel Borkmann --- net/core/filter.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) (limited to 'net/core') diff --git a/net/core/filter.c b/net/core/filter.c index 3da4b6c38b46..089aaea0ccc6 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5544,7 +5544,8 @@ static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, struct bpf_insn_access_aux *info) { - if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, delivered_ce)) + if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, + icsk_retransmits)) return false; if (off % size != 0) @@ -5575,6 +5576,20 @@ u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, offsetof(struct tcp_sock, FIELD)); \ } while (0) +#define BPF_INET_SOCK_GET_COMMON(FIELD) \ + do { \ + BUILD_BUG_ON(FIELD_SIZEOF(struct inet_connection_sock, \ + FIELD) > \ + FIELD_SIZEOF(struct bpf_tcp_sock, FIELD)); \ + *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ + struct inet_connection_sock, \ + FIELD), \ + si->dst_reg, si->src_reg, \ + offsetof( \ + struct inet_connection_sock, \ + FIELD)); \ + } while (0) + if (insn > insn_buf) return insn - insn_buf; @@ -5661,6 +5676,9 @@ u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, case offsetof(struct bpf_tcp_sock, delivered_ce): BPF_TCP_SOCK_GET_COMMON(delivered_ce); break; + case offsetof(struct bpf_tcp_sock, icsk_retransmits): + BPF_INET_SOCK_GET_COMMON(icsk_retransmits); + break; } return insn - insn_buf; -- cgit v1.2.3-59-g8ed1b