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Userland: ifconfig can change the IP address of the default gateway

Browse source 
ioctl can now perform a request for a specific route and change
the address of it's default gateway.
This commit is contained in:
marprok 2020-03-14 21:00:49 +02:00 • committed by Andreas Kling
parent 45d7ea1b63
commit 0fd5f0e4bd
5 changed files with 129 additions and 42 deletions
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124
Kernel/Net/IPv4Socket.cpp
View file

@ -465,50 +465,100 @@ KResult IPv4Socket::getsockopt(FileDescription& description, int level, int opti
int IPv4Socket::ioctl(FileDescription&, unsigned request, unsigned arg)
{
REQUIRE_PROMISE(inet);
auto* ifr = (ifreq*)arg;
if (!Process::current->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;
auto ioctl_route = [request, arg]() {
auto* route = (rtentry*)arg;
if (!Process::current->validate_read_typed(route))
return -EFAULT;
char namebuf[IFNAMSIZ + 1];
memcpy(namebuf, route->rt_dev, IFNAMSIZ);
namebuf[sizeof(namebuf) - 1] = '\0';
auto adapter = NetworkAdapter::lookup_by_name(namebuf);
if (!adapter)
return -ENODEV;
switch (request) {
case SIOCADDRT:
if (!Process::current->is_superuser())
return -EPERM;
if (route->rt_gateway.sa_family != AF_INET)
return -EAFNOSUPPORT;
if ((route->rt_flags & (RTF_UP | RTF_GATEWAY)) != (RTF_UP | RTF_GATEWAY))
return -EINVAL; // FIXME: Find the correct value to return
adapter->set_ipv4_gateway(IPv4Address(((sockaddr_in&)route->rt_gateway).sin_addr.s_addr));
return 0;
case SIOCDELRT:
// FIXME: Support gateway deletion
return 0;
}
return -EINVAL;
};
auto ioctl_interface = [request, arg]() {
auto* ifr = (ifreq*)arg;
if (!Process::current->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 (!Process::current->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 SIOCSIFNETMASK:
if (!Process::current->is_superuser())
return -EPERM;
if (ifr->ifr_addr.sa_family != AF_INET)
return -EAFNOSUPPORT;
adapter->set_ipv4_netmask(IPv4Address(((sockaddr_in&)ifr->ifr_netmask).sin_addr.s_addr));
return 0;
case SIOCGIFADDR:
if (!Process::current->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;
case SIOCGIFHWADDR:
if (!Process::current->validate_write_typed(ifr))
return -EFAULT;
ifr->ifr_hwaddr.sa_family = AF_INET;
{
auto mac_address = adapter->mac_address();
memcpy(ifr->ifr_hwaddr.sa_data, &mac_address, sizeof(MACAddress));
}
return 0;
}
return -EINVAL;
};
switch (request) {
case SIOCSIFADDR:
if (!Process::current->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 SIOCSIFNETMASK:
if (!Process::current->is_superuser())
return -EPERM;
if (ifr->ifr_addr.sa_family != AF_INET)
return -EAFNOSUPPORT;
adapter->set_ipv4_netmask(IPv4Address(((sockaddr_in&)ifr->ifr_netmask).sin_addr.s_addr));
return 0;
case SIOCGIFADDR:
if (!Process::current->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;
case SIOCGIFHWADDR:
if (!Process::current->validate_write_typed(ifr))
return -EFAULT;
ifr->ifr_hwaddr.sa_family = AF_INET;
{
auto mac_address = adapter->mac_address();
memcpy(ifr->ifr_hwaddr.sa_data, &mac_address, sizeof(MACAddress));
}
return 0;
return ioctl_interface();
case SIOCADDRT:
case SIOCDELRT:
return ioctl_route();
}
return -EINVAL;