From: Lawrence Brakmo <brakmo@fb•com>
To: netdev <netdev@vger•kernel.org>
Cc: Kernel Team <kernel-team@fb•com>, Blake Matheny <bmatheny@fb•com>,
Alexei Starovoitov <ast@fb•com>,
Daniel Borkmann <daniel@iogearbox•net>,
Eric Dumazet <eric.dumazet@gmail•com>,
Neal Cardwell <ncardwell@google•com>,
Yuchung Cheng <ycheng@google•com>
Subject: [PATCH bpf-next v8 09/12] bpf: Add sock_ops R/W access to tclass
Date: Tue, 23 Jan 2018 23:57:59 -0800 [thread overview]
Message-ID: <20180124075802.1522053-10-brakmo@fb.com> (raw)
In-Reply-To: <20180124075802.1522053-1-brakmo@fb.com>
Adds direct write access to sk_txhash and access to tclass for ipv6
flows through getsockopt and setsockopt. Sample usage for tclass:
bpf_getsockopt(skops, SOL_IPV6, IPV6_TCLASS, &v, sizeof(v))
where skops is a pointer to the ctx (struct bpf_sock_ops).
Signed-off-by: Lawrence Brakmo <brakmo@fb•com>
---
net/core/filter.c | 47 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 45 insertions(+), 2 deletions(-)
diff --git a/net/core/filter.c b/net/core/filter.c
index ffe9b60..763b2f3 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3232,6 +3232,29 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
ret = -EINVAL;
}
#ifdef CONFIG_INET
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (level == SOL_IPV6) {
+ if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
+ return -EINVAL;
+
+ val = *((int *)optval);
+ /* Only some options are supported */
+ switch (optname) {
+ case IPV6_TCLASS:
+ if (val < -1 || val > 0xff) {
+ ret = -EINVAL;
+ } else {
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ if (val == -1)
+ val = 0;
+ np->tclass = val;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
+#endif
} else if (level == SOL_TCP &&
sk->sk_prot->setsockopt == tcp_setsockopt) {
if (optname == TCP_CONGESTION) {
@@ -3241,7 +3264,8 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
strncpy(name, optval, min_t(long, optlen,
TCP_CA_NAME_MAX-1));
name[TCP_CA_NAME_MAX-1] = 0;
- ret = tcp_set_congestion_control(sk, name, false, reinit);
+ ret = tcp_set_congestion_control(sk, name, false,
+ reinit);
} else {
struct tcp_sock *tp = tcp_sk(sk);
@@ -3307,6 +3331,22 @@ BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
} else {
goto err_clear;
}
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (level == SOL_IPV6) {
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
+ goto err_clear;
+
+ /* Only some options are supported */
+ switch (optname) {
+ case IPV6_TCLASS:
+ *((int *)optval) = (int)np->tclass;
+ break;
+ default:
+ goto err_clear;
+ }
+#endif
} else {
goto err_clear;
}
@@ -3871,6 +3911,7 @@ static bool sock_ops_is_valid_access(int off, int size,
if (type == BPF_WRITE) {
switch (off) {
case offsetof(struct bpf_sock_ops, reply):
+ case offsetof(struct bpf_sock_ops, sk_txhash):
if (size != size_default)
return false;
break;
@@ -4682,7 +4723,8 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
break;
case offsetof(struct bpf_sock_ops, sk_txhash):
- SOCK_OPS_GET_FIELD(sk_txhash, sk_txhash, struct sock);
+ SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
+ struct sock, type);
break;
case offsetof(struct bpf_sock_ops, bytes_received):
@@ -4693,6 +4735,7 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
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
next prev parent reply other threads:[~2018-01-24 7:58 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-24 7:57 [PATCH bpf-next v8 00/12] bpf: More sock_ops callbacks Lawrence Brakmo
2018-01-24 7:57 ` [PATCH bpf-next v8 01/12] bpf: Make SOCK_OPS_GET_TCP size independent Lawrence Brakmo
2018-01-24 7:57 ` [PATCH bpf-next v8 02/12] bpf: Make SOCK_OPS_GET_TCP struct independent Lawrence Brakmo
2018-01-24 7:57 ` [PATCH bpf-next v8 03/12] bpf: Add write access to tcp_sock and sock fields Lawrence Brakmo
2018-01-24 7:57 ` [PATCH bpf-next v8 04/12] bpf: Only reply field should be writeable Lawrence Brakmo
2018-01-24 19:58 ` Yuchung Cheng
2018-01-24 20:23 ` Alexei Starovoitov
2018-01-24 7:57 ` [PATCH bpf-next v8 05/12] bpf: Support passing args to sock_ops bpf function Lawrence Brakmo
2018-01-24 7:57 ` [PATCH bpf-next v8 06/12] bpf: Adds field bpf_sock_ops_cb_flags to tcp_sock Lawrence Brakmo
2018-01-24 7:57 ` [PATCH bpf-next v8 07/12] bpf: Add sock_ops RTO callback Lawrence Brakmo
2018-01-24 7:57 ` [PATCH bpf-next v8 08/12] bpf: Add support for reading sk_state and more Lawrence Brakmo
2018-01-24 20:05 ` Yuchung Cheng
2018-01-24 22:07 ` Lawrence Brakmo
2018-01-24 7:57 ` Lawrence Brakmo [this message]
2018-01-24 7:58 ` [PATCH bpf-next v8 10/12] bpf: Add BPF_SOCK_OPS_RETRANS_CB Lawrence Brakmo
2018-01-24 20:01 ` Yuchung Cheng
2018-01-24 21:14 ` Lawrence Brakmo
2018-01-24 7:58 ` [PATCH bpf-next v8 11/12] bpf: Add BPF_SOCK_OPS_STATE_CB Lawrence Brakmo
2018-01-24 7:58 ` [PATCH bpf-next v8 12/12] bpf: add selftest for tcpbpf Lawrence Brakmo
2018-01-24 14:14 ` [PATCH bpf-next v8 00/12] bpf: More sock_ops callbacks Eric Dumazet
2018-01-24 15:27 ` Alexei Starovoitov
2018-01-24 15:48 ` Eric Dumazet
2018-01-24 16:48 ` Alexei Starovoitov
2018-01-24 16:58 ` Eric Dumazet
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