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socket-util: add common API for querying socket MTU

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This commit is contained in:
Lennart Poettering 2020-11-16 15:01:03 +01:00
parent 4e25d4cf0f
commit 52975f8672
2 changed files with 34 additions and 0 deletions
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32
src/basic/socket-util.c
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@ -1314,3 +1314,35 @@ int socket_set_option(int fd, int af, int opt_ipv4, int opt_ipv6, int val) {
return -EAFNOSUPPORT;
}
}
int socket_get_mtu(int fd, int af, size_t *ret) {
int mtu, r;
if (af == AF_UNSPEC) {
r = socket_get_family(fd, &af);
if (r < 0)
return r;
}
switch (af) {
case AF_INET:
r = getsockopt_int(fd, IPPROTO_IP, IP_MTU, &mtu);
break;
case AF_INET6:
r = getsockopt_int(fd, IPPROTO_IPV6, IPV6_MTU, &mtu);
break;
default:
return -EAFNOSUPPORT;
}
if (r < 0)
return r;
if (mtu <= 0)
return -EINVAL;
*ret = (size_t) mtu;
return 0;
}

2
src/basic/socket-util.h
View File

@ -299,3 +299,5 @@ static inline int socket_set_transparent(int fd, int af, bool b) {
static inline int socket_set_recvfragsize(int fd, int af, bool b) {
return socket_set_option(fd, af, IP_RECVFRAGSIZE, IPV6_RECVFRAGSIZE, b);
}
int socket_get_mtu(int fd, int af, size_t *ret);