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author | Martin KaFai Lau <martin.lau@kernel.org> | 2022-09-01 17:29:12 -0700 |
---|---|---|
committer | Alexei Starovoitov <ast@kernel.org> | 2022-09-02 20:34:31 -0700 |
commit | 65ddc82d3b96be5555a36de4e2b4547433a00532 (patch) | |
tree | 7dcd433ef37e4ef8a9a5a85bc5c2d8861858595c /net/core | |
parent | c2b063ca34586758dcfd76e12696a71a1df849a0 (diff) | |
download | linux-65ddc82d3b96be5555a36de4e2b4547433a00532.tar.bz2 |
bpf: Change bpf_getsockopt(SOL_SOCKET) to reuse sk_getsockopt()
This patch changes bpf_getsockopt(SOL_SOCKET) to reuse
sk_getsockopt(). It removes all duplicated code from
bpf_getsockopt(SOL_SOCKET).
Before this patch, there were some optnames available to
bpf_setsockopt(SOL_SOCKET) but missing in bpf_getsockopt(SOL_SOCKET).
It surprises users from time to time. For example, SO_REUSEADDR,
SO_KEEPALIVE, SO_RCVLOWAT, and SO_MAX_PACING_RATE. This patch
automatically closes this gap without duplicating more code.
The only exception is SO_BINDTODEVICE because it needs to acquire a
blocking lock. Thus, SO_BINDTODEVICE is not supported.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002912.2894040-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/core')
-rw-r--r-- | net/core/filter.c | 57 | ||||
-rw-r--r-- | net/core/sock.c | 4 |
2 files changed, 25 insertions, 36 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 55795815cc44..9b26653a7e1f 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5017,8 +5017,9 @@ static const struct bpf_func_proto bpf_get_socket_uid_proto = { .arg1_type = ARG_PTR_TO_CTX, }; -static int sol_socket_setsockopt(struct sock *sk, int optname, - char *optval, int optlen) +static int sol_socket_sockopt(struct sock *sk, int optname, + char *optval, int *optlen, + bool getopt) { switch (optname) { case SO_REUSEADDR: @@ -5032,7 +5033,7 @@ static int sol_socket_setsockopt(struct sock *sk, int optname, case SO_MAX_PACING_RATE: case SO_BINDTOIFINDEX: case SO_TXREHASH: - if (optlen != sizeof(int)) + if (*optlen != sizeof(int)) return -EINVAL; break; case SO_BINDTODEVICE: @@ -5041,8 +5042,16 @@ static int sol_socket_setsockopt(struct sock *sk, int optname, return -EINVAL; } + if (getopt) { + if (optname == SO_BINDTODEVICE) + return -EINVAL; + return sk_getsockopt(sk, SOL_SOCKET, optname, + KERNEL_SOCKPTR(optval), + KERNEL_SOCKPTR(optlen)); + } + return sk_setsockopt(sk, SOL_SOCKET, optname, - KERNEL_SOCKPTR(optval), optlen); + KERNEL_SOCKPTR(optval), *optlen); } static int bpf_sol_tcp_setsockopt(struct sock *sk, int optname, @@ -5168,7 +5177,7 @@ static int __bpf_setsockopt(struct sock *sk, int level, int optname, return -EINVAL; if (level == SOL_SOCKET) - return sol_socket_setsockopt(sk, optname, optval, optlen); + return sol_socket_sockopt(sk, optname, optval, &optlen, false); else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) return sol_ip_setsockopt(sk, optname, optval, optlen); else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) @@ -5190,38 +5199,13 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname, static int __bpf_getsockopt(struct sock *sk, int level, int optname, char *optval, int optlen) { + int err = 0, saved_optlen = optlen; + if (!sk_fullsock(sk)) goto err_clear; if (level == SOL_SOCKET) { - if (optlen != sizeof(int)) - goto err_clear; - - switch (optname) { - case SO_RCVBUF: - *((int *)optval) = sk->sk_rcvbuf; - break; - case SO_SNDBUF: - *((int *)optval) = sk->sk_sndbuf; - break; - case SO_MARK: - *((int *)optval) = sk->sk_mark; - break; - case SO_PRIORITY: - *((int *)optval) = sk->sk_priority; - break; - case SO_BINDTOIFINDEX: - *((int *)optval) = sk->sk_bound_dev_if; - break; - case SO_REUSEPORT: - *((int *)optval) = sk->sk_reuseport; - break; - case SO_TXREHASH: - *((int *)optval) = sk->sk_txrehash; - break; - default: - goto err_clear; - } + err = sol_socket_sockopt(sk, optname, optval, &optlen, true); } else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { struct inet_connection_sock *icsk; @@ -5278,7 +5262,12 @@ static int __bpf_getsockopt(struct sock *sk, int level, int optname, } else { goto err_clear; } - return 0; + + if (err) + optlen = 0; + if (optlen < saved_optlen) + memset(optval + optlen, 0, saved_optlen - optlen); + return err; err_clear: memset(optval, 0, optlen); return -EINVAL; diff --git a/net/core/sock.c b/net/core/sock.c index 7fa30fd4b37f..68e4662eb2eb 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1583,8 +1583,8 @@ static int groups_to_user(sockptr_t dst, const struct group_info *src) return 0; } -static int sk_getsockopt(struct sock *sk, int level, int optname, - sockptr_t optval, sockptr_t optlen) +int sk_getsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, sockptr_t optlen) { struct socket *sock = sk->sk_socket; |