db9d4d3a3c
If the attribute 'interface' is not set in a 'domain' tag, the router tries to dynamically receive and maintain an IP configuration for that domain by using DHCP in the client role at all interfaces that connect to the domain. In the DHCP discover phase, the router simply chooses the first DHCP offer that arrives. So, no comparison of different DHCP offers is done. In the DHCP request phase, the server is expected to provide an IP address, a gateway, a subnet mask, and an IP lease time to the router. If anything substantial goes wrong during a DHCP exchange, the router discards the outcome of the exchange and goes back to the DHCP discover phase. At any time where there is no valid IP configuration present at a domain, the domain does only act as DHCP client and all other router functionality is disabled for the domain. A domain cannot act as DHCP client and DHCP server at once. So, a 'domain' tag must either have an 'interface' attribute or must not contain a 'dhcp-server' tag. Ref #2534
77 lines
1.6 KiB
C++
77 lines
1.6 KiB
C++
/*
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* \brief Ipv4 address combined with a subnet prefix length
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* \author Martin Stein
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* \date 2017-10-12
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _IPV4_ADDRESS_PREFIX_H_
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#define _IPV4_ADDRESS_PREFIX_H_
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/* Genode includes */
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#include <net/ipv4.h>
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namespace Net { class Ipv4_address_prefix; }
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struct Net::Ipv4_address_prefix
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{
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Ipv4_address address;
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Genode::uint8_t prefix;
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Ipv4_address_prefix(Ipv4_address address,
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Ipv4_address subnet_mask);
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Ipv4_address_prefix() : prefix(32) { }
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bool valid() const { return address.valid() || prefix == 0; }
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void print(Genode::Output &output) const;
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bool prefix_matches(Ipv4_address const &ip) const;
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Ipv4_address subnet_mask() const;
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Ipv4_address broadcast_address() const;
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};
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namespace Genode {
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inline size_t ascii_to(char const *s, Net::Ipv4_address_prefix &result);
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}
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Genode::size_t Genode::ascii_to(char const *s, Net::Ipv4_address_prefix &result)
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{
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/* read the leading IPv4 address, fail if there's no address */
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Net::Ipv4_address_prefix buf;
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size_t read_len = ascii_to(s, buf.address);
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if (!read_len) {
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return 0; }
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/* check for the following slash */
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s += read_len;
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if (*s != '/') {
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return 0; }
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read_len++;
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s++;
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/* read the prefix, fail if there's no prefix */
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size_t prefix_len = ascii_to_unsigned(s, buf.prefix, 10);
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if (!prefix_len) {
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return 0; }
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/* fill result and return read length */
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result = buf;
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return read_len + prefix_len;
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}
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#endif /* _IPV4_ADDRESS_PREFIX_H_ */
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