From: "Nikita V. Shirokov" <tehnerd@fb.com>
Date: Mon, 26 Mar 2018 08:36:57 -0700
Subject: bpf: Add sock_ops R/W access to ipv4 tos
Patch-mainline: v4.17-rc1
Git-commit: 6f5c39fa5cd4a78c5432021e981aa8f79437a32c
References: bsc#1109837
Sample usage for tos ...
bpf_getsockopt(skops, SOL_IP, IP_TOS, &v, sizeof(v))
... where skops is a pointer to the ctx (struct bpf_sock_ops).
Signed-off-by: Nikita V. Shirokov <tehnerd@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/core/filter.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3447,6 +3447,27 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_so
ret = -EINVAL;
}
#ifdef CONFIG_INET
+ } else if (level == SOL_IP) {
+ if (optlen != sizeof(int) || sk->sk_family != AF_INET)
+ return -EINVAL;
+
+ val = *((int *)optval);
+ /* Only some options are supported */
+ switch (optname) {
+ case IP_TOS:
+ if (val < -1 || val > 0xff) {
+ ret = -EINVAL;
+ } else {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (val == -1)
+ val = 0;
+ inet->tos = val;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
#if IS_ENABLED(CONFIG_IPV6)
} else if (level == SOL_IPV6) {
if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
@@ -3546,6 +3567,20 @@ BPF_CALL_5(bpf_getsockopt, struct bpf_so
} else {
goto err_clear;
}
+ } else if (level == SOL_IP) {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (optlen != sizeof(int) || sk->sk_family != AF_INET)
+ goto err_clear;
+
+ /* Only some options are supported */
+ switch (optname) {
+ case IP_TOS:
+ *((int *)optval) = (int)inet->tos;
+ break;
+ default:
+ goto err_clear;
+ }
#if IS_ENABLED(CONFIG_IPV6)
} else if (level == SOL_IPV6) {
struct ipv6_pinfo *np = inet6_sk(sk);