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IPv4: Implement socket ioctls SIOCGIFADDR and SIOCSIFADDR

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This allows userspace programs to get and set (superuser-only) the IPv4
address of a network adapter. :^)
This commit is contained in:
Andreas Kling 2019-09-23 19:06:03 +02:00
parent a3575f3c60
commit 2482fc3538
7 changed files with 117 additions and 1 deletions
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35
Kernel/Net/IPv4Socket.cpp
View file

@ -13,6 +13,7 @@
#include <Kernel/Process.h>
#include <Kernel/UnixTypes.h>
#include <LibC/errno_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
//#define IPV4_SOCKET_DEBUG
@ -337,7 +338,6 @@ KResult IPv4Socket::getsockopt(int level, int option, void* value, socklen_t* va
if (level != IPPROTO_IP)
return Socket::getsockopt(level, option, value, value_size);
switch (option) {
case IP_TTL:
if (*value_size < sizeof(int))
@ -348,3 +348,36 @@ KResult IPv4Socket::getsockopt(int level, int option, void* value, socklen_t* va
return KResult(-ENOPROTOOPT);
}
}
int IPv4Socket::ioctl(FileDescription&, unsigned request, unsigned arg)
{
auto* ifr = (ifreq*)arg;
if (!current->process().validate_read_typed(ifr))
return -EFAULT;
char namebuf[IFNAMSIZ + 1];
memcpy(namebuf, ifr->ifr_name, IFNAMSIZ);
namebuf[sizeof(namebuf) - 1] = '\0';
auto adapter = NetworkAdapter::lookup_by_name(namebuf);
if (!adapter)
return -ENODEV;
switch (request) {
case SIOCSIFADDR:
if (!current->process().is_superuser())
return -EPERM;
if (ifr->ifr_addr.sa_family != AF_INET)
return -EAFNOSUPPORT;
adapter->set_ipv4_address(IPv4Address(((sockaddr_in&)ifr->ifr_addr).sin_addr.s_addr));
return 0;
case SIOCGIFADDR:
if (!current->process().validate_write_typed(ifr))
return -EFAULT;
ifr->ifr_addr.sa_family = AF_INET;
((sockaddr_in&)ifr->ifr_addr).sin_addr.s_addr = adapter->ipv4_address().to_u32();
return 0;
}
return -EINVAL;
}