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bpf: Change bpf_getsockopt(SOL_IP) to reuse do_ip_getsockopt()

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This patch changes bpf_getsockopt(SOL_IP) to reuse
do_ip_getsockopt() and remove the duplicated code.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002925.2895416-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Martin KaFai Lau 2022-09-01 17:29:25 -07:00 committed by Alexei Starovoitov
parent 273b7f0fb4
commit fd969f25fe
3 changed files with 16 additions and 20 deletions
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2
include/net/ip.h
View file

@ -747,6 +747,8 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
unsigned int optlen);
int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
unsigned int optlen);
int do_ip_getsockopt(struct sock *sk, int level, int optname,
sockptr_t optval, sockptr_t optlen);
int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
int __user *optlen);
int ip_ra_control(struct sock *sk, unsigned char on,

30
net/core/filter.c
View file

@ -5166,23 +5166,29 @@ static int sol_tcp_sockopt(struct sock *sk, int optname,
KERNEL_SOCKPTR(optval), *optlen);
}
static int sol_ip_setsockopt(struct sock *sk, int optname,
char *optval, int optlen)
static int sol_ip_sockopt(struct sock *sk, int optname,
char *optval, int *optlen,
bool getopt)
{
if (sk->sk_family != AF_INET)
return -EINVAL;
switch (optname) {
case IP_TOS:
if (optlen != sizeof(int))
if (*optlen != sizeof(int))
return -EINVAL;
break;
default:
return -EINVAL;
}
if (getopt)
return do_ip_getsockopt(sk, SOL_IP, optname,
KERNEL_SOCKPTR(optval),
KERNEL_SOCKPTR(optlen));
return do_ip_setsockopt(sk, SOL_IP, optname,
KERNEL_SOCKPTR(optval), optlen);
KERNEL_SOCKPTR(optval), *optlen);
}
static int sol_ipv6_setsockopt(struct sock *sk, int optname,
@ -5214,7 +5220,7 @@ static int __bpf_setsockopt(struct sock *sk, int level, int optname,
if (level == SOL_SOCKET)
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);
return sol_ip_sockopt(sk, optname, optval, &optlen, false);
else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6)
return sol_ipv6_setsockopt(sk, optname, optval, optlen);
else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP)
@ -5244,19 +5250,7 @@ static int __bpf_getsockopt(struct sock *sk, int level, int optname,
} else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) {
err = sol_tcp_sockopt(sk, optname, optval, &optlen, true);
} else if (IS_ENABLED(CONFIG_INET) && 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;
}
err = sol_ip_sockopt(sk, optname, optval, &optlen, true);
} else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) {
struct ipv6_pinfo *np = inet6_sk(sk);

4
net/ipv4/ip_sockglue.c
View file

@ -1524,8 +1524,8 @@ static int compat_ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval,
return 0;
}
static int do_ip_getsockopt(struct sock *sk, int level, int optname,
sockptr_t optval, sockptr_t optlen)
int do_ip_getsockopt(struct sock *sk, int level, int optname,
sockptr_t optval, sockptr_t optlen)
{
struct inet_sock *inet = inet_sk(sk);
bool needs_rtnl = getsockopt_needs_rtnl(optname);