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Kernel: Implement IP multicast support

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An IP socket can now join a multicast group by using the
IP_ADD_MEMBERSHIP sockopt, which will cause it to start receiving
packets sent to the multicast address, even though this address does
not belong to this host.
This commit is contained in:
Sergey Bugaev 2021-05-04 14:42:47 +03:00 • committed by Andreas Kling
parent b9c367e13b
commit 78459b92d5
5 changed files with 77 additions and 7 deletions
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46
Kernel/Net/IPv4Socket.cpp
View file

@ -466,6 +466,42 @@ KResult IPv4Socket::setsockopt(int level, int option, Userspace<const void*> use
m_ttl = value;
return KSuccess;
}
case IP_MULTICAST_LOOP: {
if (user_value_size != 1)
return EINVAL;
u8 value;
if (!copy_from_user(&value, static_ptr_cast<const u8*>(user_value)))
return EFAULT;
if (value != 0 && value != 1)
return EINVAL;
m_multicast_loop = value;
return KSuccess;
}
case IP_ADD_MEMBERSHIP: {
if (user_value_size != sizeof(ip_mreq))
return EINVAL;
ip_mreq mreq;
if (!copy_from_user(&mreq, static_ptr_cast<const ip_mreq*>(user_value)))
return EFAULT;
if (mreq.imr_interface.s_addr != INADDR_ANY)
return ENOTSUP;
IPv4Address address { (const u8*)&mreq.imr_multiaddr.s_addr };
if (!m_multicast_memberships.contains_slow(address))
m_multicast_memberships.append(address);
return KSuccess;
}
case IP_DROP_MEMBERSHIP: {
if (user_value_size != sizeof(ip_mreq))
return EINVAL;
ip_mreq mreq;
if (!copy_from_user(&mreq, static_ptr_cast<const ip_mreq*>(user_value)))
return EFAULT;
if (mreq.imr_interface.s_addr != INADDR_ANY)
return ENOTSUP;
IPv4Address address { (const u8*)&mreq.imr_multiaddr.s_addr };
m_multicast_memberships.remove_first_matching([&address](auto& a) { return a == address; });
return KSuccess;
}
default:
return ENOPROTOOPT;
}
@ -490,6 +526,16 @@ KResult IPv4Socket::getsockopt(FileDescription& description, int level, int opti
if (!copy_to_user(value_size, &size))
return EFAULT;
return KSuccess;
case IP_MULTICAST_LOOP: {
if (size < 1)
return EINVAL;
if (!copy_to_user(static_ptr_cast<u8*>(value), (const u8*)&m_multicast_loop))
return EFAULT;
size = 1;
if (!copy_to_user(value_size, &size))
return EFAULT;
return KSuccess;
}
default:
return ENOPROTOOPT;
}