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author | Tom Gundersen <teg@jklm.no> | 2014-08-06 15:54:03 +0200 |
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committer | Tom Gundersen <teg@jklm.no> | 2014-08-12 20:42:59 +0200 |
commit | b22d8a00f48f3c5fc4510b4acd3e1a43e731e592 (patch) | |
tree | 67568050b229a99af15b7d4e23feafc2a8a80ed1 /src/network/networkd-ipv4ll.c | |
parent | networkd: link - make check for whether addresses/routes are being configured... (diff) | |
download | systemd-b22d8a00f48f3c5fc4510b4acd3e1a43e731e592.tar.xz systemd-b22d8a00f48f3c5fc4510b4acd3e1a43e731e592.zip |
networkd: link - split out ipv4ll handling
Diffstat (limited to 'src/network/networkd-ipv4ll.c')
-rw-r--r-- | src/network/networkd-ipv4ll.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c new file mode 100644 index 0000000000..5467bc372e --- /dev/null +++ b/src/network/networkd-ipv4ll.c @@ -0,0 +1,248 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2013-2014 Tom Gundersen <teg@jklm.no> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <netinet/ether.h> +#include <linux/if.h> + +#include "networkd-link.h" +#include "network-internal.h" + +static int ipv4ll_address_lost(Link *link) { + _cleanup_address_free_ Address *address = NULL; + _cleanup_route_free_ Route *route = NULL; + struct in_addr addr; + int r; + + assert(link); + + link->ipv4ll_route = false; + link->ipv4ll_address = false; + + r = sd_ipv4ll_get_address(link->ipv4ll, &addr); + if (r < 0) + return 0; + + log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u", + ADDRESS_FMT_VAL(addr)); + + r = address_new_dynamic(&address); + if (r < 0) { + log_error_link(link, "Could not allocate address: %s", strerror(-r)); + return r; + } + + address->family = AF_INET; + address->in_addr.in = addr; + address->prefixlen = 16; + address->scope = RT_SCOPE_LINK; + + address_drop(address, link, &link_address_drop_handler); + + r = route_new_dynamic(&route, RTPROT_UNSPEC); + if (r < 0) { + log_error_link(link, "Could not allocate route: %s", + strerror(-r)); + return r; + } + + route->family = AF_INET; + route->scope = RT_SCOPE_LINK; + route->metrics = IPV4LL_ROUTE_METRIC; + + route_drop(route, link, &link_route_drop_handler); + + link_client_handler(link); + + return 0; +} + +static int ipv4ll_route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(link); + assert(!link->ipv4ll_route); + + r = sd_rtnl_message_get_errno(m); + if (r < 0 && r != -EEXIST) { + log_error_link(link, "could not set ipv4ll route: %s", strerror(-r)); + link_enter_failed(link); + } + + link->ipv4ll_route = true; + + if (link->ipv4ll_address == true) + link_client_handler(link); + + return 1; +} + +static int ipv4ll_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(link); + assert(!link->ipv4ll_address); + + r = sd_rtnl_message_get_errno(m); + if (r < 0 && r != -EEXIST) { + log_error_link(link, "could not set ipv4ll address: %s", strerror(-r)); + link_enter_failed(link); + } else if (r >= 0) { + /* calling handler directly so take a ref */ + link_ref(link); + link_get_address_handler(rtnl, m, link); + } + + link->ipv4ll_address = true; + + if (link->ipv4ll_route == true) + link_client_handler(link); + + return 1; +} + +static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { + _cleanup_address_free_ Address *ll_addr = NULL; + _cleanup_route_free_ Route *route = NULL; + struct in_addr address; + int r; + + assert(ll); + assert(link); + + r = sd_ipv4ll_get_address(ll, &address); + if (r == -ENOENT) + return 0; + else if (r < 0) + return r; + + log_debug_link(link, "IPv4 link-local claim %u.%u.%u.%u", + ADDRESS_FMT_VAL(address)); + + r = address_new_dynamic(&ll_addr); + if (r < 0) + return r; + + ll_addr->family = AF_INET; + ll_addr->in_addr.in = address; + ll_addr->prefixlen = 16; + ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen); + ll_addr->scope = RT_SCOPE_LINK; + + r = address_configure(ll_addr, link, ipv4ll_address_handler); + if (r < 0) + return r; + + link->ipv4ll_address = false; + + r = route_new_dynamic(&route, RTPROT_STATIC); + if (r < 0) + return r; + + route->family = AF_INET; + route->scope = RT_SCOPE_LINK; + route->metrics = IPV4LL_ROUTE_METRIC; + + r = route_configure(route, link, ipv4ll_route_handler); + if (r < 0) + return r; + + link->ipv4ll_route = false; + + return 0; +} + +static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){ + Link *link = userdata; + int r; + + assert(link); + assert(link->network); + assert(link->manager); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return; + + switch(event) { + case IPV4LL_EVENT_STOP: + case IPV4LL_EVENT_CONFLICT: + r = ipv4ll_address_lost(link); + if (r < 0) { + link_enter_failed(link); + return; + } + break; + case IPV4LL_EVENT_BIND: + r = ipv4ll_address_claimed(ll, link); + if (r < 0) { + link_enter_failed(link); + return; + } + break; + default: + if (event < 0) + log_warning_link(link, "IPv4 link-local error: %s", strerror(-event)); + else + log_warning_link(link, "IPv4 link-local unknown event: %d", event); + break; + } +} + +int ipv4ll_configure(Link *link) { + uint8_t seed[8]; + int r; + + assert(link); + assert(link->network); + assert(link->network->ipv4ll); + + r = sd_ipv4ll_new(&link->ipv4ll); + if (r < 0) + return r; + + if (link->udev_device) { + r = net_get_unique_predictable_data(link->udev_device, seed); + if (r >= 0) { + r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); + if (r < 0) + return r; + } + } + + r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); + if (r < 0) + return r; + + r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); + if (r < 0) + return r; + + r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex); + if (r < 0) + return r; + + r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); + if (r < 0) + return r; + + return 0; +} |