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ipv4: add ip_sock_set_pktinfo 

Add a helper to directly set the IP_PKTINFO sockopt from kernel
space without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-28 07:12:30 +02:00 committed by David S. Miller
parent 2de569bda2
commit c1f9ec5776
3 changed files with 11 additions and 3 deletions
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1
include/net/ip.h
View File

@ -767,6 +767,7 @@ static inline bool inetdev_valid_mtu(unsigned int mtu)
void ip_sock_set_freebind(struct sock *sk);
int ip_sock_set_mtu_discover(struct sock *sk, int val);
void ip_sock_set_pktinfo(struct sock *sk);
void ip_sock_set_recverr(struct sock *sk);
void ip_sock_set_tos(struct sock *sk, int val);

8
net/ipv4/ip_sockglue.c
View File

@ -608,6 +608,14 @@ int ip_sock_set_mtu_discover(struct sock *sk, int val)
}
EXPORT_SYMBOL(ip_sock_set_mtu_discover);
void ip_sock_set_pktinfo(struct sock *sk)
{
lock_sock(sk);
inet_sk(sk)->cmsg_flags |= IP_CMSG_PKTINFO;
release_sock(sk);
}
EXPORT_SYMBOL(ip_sock_set_pktinfo);
/*
* Socket option code for IP. This is the end of the line after any
* TCP,UDP etc options on an IP socket.

5
net/sunrpc/svcsock.c
View File

@ -616,9 +616,8 @@ static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
/* make sure we get destination address info */
switch (svsk->sk_sk->sk_family) {
case AF_INET:
level = SOL_IP;
optname = IP_PKTINFO;
break;
ip_sock_set_pktinfo(svsk->sk_sock->sk);
return;
case AF_INET6:
level = SOL_IPV6;
optname = IPV6_RECVPKTINFO;