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Message-ID: <20180124075802.1522053-9-brakmo@fb.com>
Date: Tue, 23 Jan 2018 23:57:58 -0800
From: Lawrence Brakmo <brakmo@...com>
To: netdev <netdev@...r.kernel.org>
CC: Kernel Team <kernel-team@...com>, Blake Matheny <bmatheny@...com>,
Alexei Starovoitov <ast@...com>,
Daniel Borkmann <daniel@...earbox.net>,
Eric Dumazet <eric.dumazet@...il.com>,
Neal Cardwell <ncardwell@...gle.com>,
Yuchung Cheng <ycheng@...gle.com>
Subject: [PATCH bpf-next v8 08/12] bpf: Add support for reading sk_state and more
Add support for reading many more tcp_sock fields
state, same as sk->sk_state
rtt_min same as sk->rtt_min.s[0].v (current rtt_min)
snd_ssthresh
rcv_nxt
snd_nxt
snd_una
mss_cache
ecn_flags
rate_delivered
rate_interval_us
packets_out
retrans_out
total_retrans
segs_in
data_segs_in
segs_out
data_segs_out
sk_txhash
bytes_received (__u64)
bytes_acked (__u64)
Signed-off-by: Lawrence Brakmo <brakmo@...com>
---
include/uapi/linux/bpf.h | 20 +++++++
net/core/filter.c | 135 +++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 144 insertions(+), 11 deletions(-)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 2a8c40a..6998032 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -979,6 +979,26 @@ struct bpf_sock_ops {
__u32 snd_cwnd;
__u32 srtt_us; /* Averaged RTT << 3 in usecs */
__u32 bpf_sock_ops_cb_flags; /* flags defined in uapi/linux/tcp.h */
+ __u32 state;
+ __u32 rtt_min;
+ __u32 snd_ssthresh;
+ __u32 rcv_nxt;
+ __u32 snd_nxt;
+ __u32 snd_una;
+ __u32 mss_cache;
+ __u32 ecn_flags;
+ __u32 rate_delivered;
+ __u32 rate_interval_us;
+ __u32 packets_out;
+ __u32 retrans_out;
+ __u32 total_retrans;
+ __u32 segs_in;
+ __u32 data_segs_in;
+ __u32 segs_out;
+ __u32 data_segs_out;
+ __u32 sk_txhash;
+ __u64 bytes_received;
+ __u64 bytes_acked;
};
/* List of known BPF sock_ops operators.
diff --git a/net/core/filter.c b/net/core/filter.c
index 6936d19..ffe9b60 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3855,33 +3855,43 @@ void bpf_warn_invalid_xdp_action(u32 act)
}
EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
-static bool __is_valid_sock_ops_access(int off, int size)
+static bool sock_ops_is_valid_access(int off, int size,
+ enum bpf_access_type type,
+ struct bpf_insn_access_aux *info)
{
+ const int size_default = sizeof(__u32);
+
if (off < 0 || off >= sizeof(struct bpf_sock_ops))
return false;
+
/* The verifier guarantees that size > 0. */
if (off % size != 0)
return false;
- if (size != sizeof(__u32))
- return false;
-
- return true;
-}
-static bool sock_ops_is_valid_access(int off, int size,
- enum bpf_access_type type,
- struct bpf_insn_access_aux *info)
-{
if (type == BPF_WRITE) {
switch (off) {
case offsetof(struct bpf_sock_ops, reply):
+ if (size != size_default)
+ return false;
break;
default:
return false;
}
+ } else {
+ switch (off) {
+ case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received,
+ bytes_acked):
+ if (size != sizeof(__u64))
+ return false;
+ break;
+ default:
+ if (size != size_default)
+ return false;
+ break;
+ }
}
- return __is_valid_sock_ops_access(off, size);
+ return true;
}
static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
@@ -4498,6 +4508,32 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
is_fullsock));
break;
+ case offsetof(struct bpf_sock_ops, state):
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_state) != 1);
+
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg,
+ offsetof(struct sock_common, skc_state));
+ break;
+
+ case offsetof(struct bpf_sock_ops, rtt_min):
+ BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) !=
+ sizeof(struct minmax));
+ BUILD_BUG_ON(sizeof(struct minmax) <
+ sizeof(struct minmax_sample));
+
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
+ struct bpf_sock_ops_kern, sk),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, sk));
+ *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
+ offsetof(struct tcp_sock, rtt_min) +
+ FIELD_SIZEOF(struct minmax_sample, t));
+ break;
+
/* Helper macro for adding read access to tcp_sock or sock fields. */
#define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
do { \
@@ -4580,6 +4616,83 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags,
struct tcp_sock);
break;
+
+ case offsetof(struct bpf_sock_ops, snd_ssthresh):
+ SOCK_OPS_GET_FIELD(snd_ssthresh, snd_ssthresh, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, rcv_nxt):
+ SOCK_OPS_GET_FIELD(rcv_nxt, rcv_nxt, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, snd_nxt):
+ SOCK_OPS_GET_FIELD(snd_nxt, snd_nxt, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, snd_una):
+ SOCK_OPS_GET_FIELD(snd_una, snd_una, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, mss_cache):
+ SOCK_OPS_GET_FIELD(mss_cache, mss_cache, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, ecn_flags):
+ SOCK_OPS_GET_FIELD(ecn_flags, ecn_flags, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, rate_delivered):
+ SOCK_OPS_GET_FIELD(rate_delivered, rate_delivered,
+ struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, rate_interval_us):
+ SOCK_OPS_GET_FIELD(rate_interval_us, rate_interval_us,
+ struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, packets_out):
+ SOCK_OPS_GET_FIELD(packets_out, packets_out, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, retrans_out):
+ SOCK_OPS_GET_FIELD(retrans_out, retrans_out, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, total_retrans):
+ SOCK_OPS_GET_FIELD(total_retrans, total_retrans,
+ struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, segs_in):
+ SOCK_OPS_GET_FIELD(segs_in, segs_in, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, data_segs_in):
+ SOCK_OPS_GET_FIELD(data_segs_in, data_segs_in, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, segs_out):
+ SOCK_OPS_GET_FIELD(segs_out, segs_out, struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, data_segs_out):
+ SOCK_OPS_GET_FIELD(data_segs_out, data_segs_out,
+ struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, sk_txhash):
+ SOCK_OPS_GET_FIELD(sk_txhash, sk_txhash, struct sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, bytes_received):
+ SOCK_OPS_GET_FIELD(bytes_received, bytes_received,
+ struct tcp_sock);
+ break;
+
+ case offsetof(struct bpf_sock_ops, bytes_acked):
+ SOCK_OPS_GET_FIELD(bytes_acked, bytes_acked, struct tcp_sock);
+ break;
}
return insn - insn_buf;
}
--
2.9.5
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