Commit 6f5c39fa authored by Nikita V. Shirokov's avatar Nikita V. Shirokov Committed by Daniel Borkmann
Browse files

bpf: Add sock_ops R/W access to ipv4 tos 



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: default avatarNikita V. Shirokov <tehnerd@fb.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 20cfb7a0

net/core/filter.c

+35 −0
Original line number Diff line number Diff line
@@ -3462,6 +3462,27 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 
			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)
@@ -3561,6 +3582,20 @@ BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 
		} 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);

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