3b015d40c1
Router Discovery is a core part of IPv6, which by default is handled by the kernel. However, the kernel implementation is meant as a fall-back, and to fully support the protocol a userspace implementation is desired. The protocol essentially listens for Router Advertisement packets from routers on the local link and use these to configure the client automatically. The four main pieces of information are: what kind (if any) of DHCPv6 configuration should be performed; a default gateway; the prefixes that should be considered to be on the local link; and the prefixes with which we can preform SLAAC in order to pick a global IPv6 address. A lot of additional information is also available, which we do not yet fully support, but which will eventually allow us to avoid the need for DHCPv6 in the common case. Short-term, the reason for wanting this is in userspace was the desire to fully track all the addresses on links we manage, and that is not possible for addresses managed by the kernel (as the kernel does not expose to us the fact that it manages these addresses). Moreover, we would like to support stable privacy addresses, which will soon be mandated and the legacy MAC-based global addresses deprecated, to do this well we need to handle the generation in userspace. Lastly, more long-term we wish to support more RA options than what the kernel exposes.
79 lines
3.7 KiB
C
79 lines
3.7 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2013 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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typedef struct Route Route;
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#include "networkd.h"
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#include "networkd-network.h"
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struct Route {
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Network *network;
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unsigned section;
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Link *link;
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int family;
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unsigned char dst_prefixlen;
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unsigned char src_prefixlen;
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unsigned char scope;
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unsigned char protocol; /* RTPROT_* */
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unsigned char tos;
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uint32_t priority; /* note that ip(8) calls this 'metric' */
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unsigned char table;
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unsigned char pref;
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unsigned flags;
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union in_addr_union gw;
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union in_addr_union dst;
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union in_addr_union src;
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union in_addr_union prefsrc;
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usec_t lifetime;
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sd_event_source *expire;
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LIST_FIELDS(Route, routes);
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};
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int route_new_static(Network *network, unsigned section, Route **ret);
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int route_new(Route **ret);
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void route_free(Route *route);
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int route_configure(Route *route, Link *link, sd_netlink_message_handler_t callback);
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int route_remove(Route *route, Link *link, sd_netlink_message_handler_t callback);
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int route_get(Link *link, int family, union in_addr_union *dst, unsigned char dst_prefixlen, unsigned char tos, uint32_t priority, unsigned char table, Route **ret);
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int route_add(Link *link, int family, union in_addr_union *dst, unsigned char dst_prefixlen, unsigned char tos, uint32_t priority, unsigned char table, Route **ret);
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int route_add_foreign(Link *link, int family, union in_addr_union *dst, unsigned char dst_prefixlen, unsigned char tos, uint32_t priority, unsigned char table, Route **ret);
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int route_update(Route *route, union in_addr_union *src, unsigned char src_prefixlen, union in_addr_union *gw, union in_addr_union *prefsrc, unsigned char scope, unsigned char protocol);
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void route_drop(Route *route);
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int route_expire_handler(sd_event_source *s, uint64_t usec, void *userdata);
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DEFINE_TRIVIAL_CLEANUP_FUNC(Route*, route_free);
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#define _cleanup_route_free_ _cleanup_(route_freep)
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int config_parse_gateway(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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int config_parse_preferred_src(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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int config_parse_destination(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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int config_parse_route_priority(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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int config_parse_route_scope(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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