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Diffstat (limited to 'src/libsystemd/sd-netlink/local-addresses.c')
-rw-r--r--src/libsystemd/sd-netlink/local-addresses.c276
1 files changed, 276 insertions, 0 deletions
diff --git a/src/libsystemd/sd-netlink/local-addresses.c b/src/libsystemd/sd-netlink/local-addresses.c
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+++ b/src/libsystemd/sd-netlink/local-addresses.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2008-2011 Lennart Poettering
+ Copyright 2014 Tom Gundersen
+
+ 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 "sd-netlink.h"
+#include "netlink-util.h"
+#include "macro.h"
+#include "local-addresses.h"
+
+static int address_compare(const void *_a, const void *_b) {
+ const struct local_address *a = _a, *b = _b;
+
+ /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
+
+ if (a->family == AF_INET && b->family == AF_INET6)
+ return -1;
+ if (a->family == AF_INET6 && b->family == AF_INET)
+ return 1;
+
+ if (a->scope < b->scope)
+ return -1;
+ if (a->scope > b->scope)
+ return 1;
+
+ if (a->metric < b->metric)
+ return -1;
+ if (a->metric > b->metric)
+ return 1;
+
+ if (a->ifindex < b->ifindex)
+ return -1;
+ if (a->ifindex > b->ifindex)
+ return 1;
+
+ return memcmp(&a->address, &b->address, FAMILY_ADDRESS_SIZE(a->family));
+}
+
+int local_addresses(sd_netlink *context, int ifindex, int af, struct local_address **ret) {
+ _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL;
+ _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
+ _cleanup_free_ struct local_address *list = NULL;
+ size_t n_list = 0, n_allocated = 0;
+ sd_netlink_message *m;
+ int r;
+
+ assert(ret);
+
+ if (context)
+ rtnl = sd_netlink_ref(context);
+ else {
+ r = sd_netlink_open(&rtnl);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, af);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_call(rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (m = reply; m; m = sd_netlink_message_next(m)) {
+ struct local_address *a;
+ unsigned char flags;
+ uint16_t type;
+ int ifi, family;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_get_type(m, &type);
+ if (r < 0)
+ return r;
+ if (type != RTM_NEWADDR)
+ continue;
+
+ r = sd_rtnl_message_addr_get_ifindex(m, &ifi);
+ if (r < 0)
+ return r;
+ if (ifindex > 0 && ifi != ifindex)
+ continue;
+
+ r = sd_rtnl_message_addr_get_family(m, &family);
+ if (r < 0)
+ return r;
+ if (af != AF_UNSPEC && af != family)
+ continue;
+
+ r = sd_rtnl_message_addr_get_flags(m, &flags);
+ if (r < 0)
+ return r;
+ if (flags & IFA_F_DEPRECATED)
+ continue;
+
+ if (!GREEDY_REALLOC0(list, n_allocated, n_list+1))
+ return -ENOMEM;
+
+ a = list + n_list;
+
+ r = sd_rtnl_message_addr_get_scope(m, &a->scope);
+ if (r < 0)
+ return r;
+
+ if (ifindex == 0 && (a->scope == RT_SCOPE_HOST || a->scope == RT_SCOPE_NOWHERE))
+ continue;
+
+ switch (family) {
+
+ case AF_INET:
+ r = sd_netlink_message_read_in_addr(m, IFA_LOCAL, &a->address.in);
+ if (r < 0) {
+ r = sd_netlink_message_read_in_addr(m, IFA_ADDRESS, &a->address.in);
+ if (r < 0)
+ continue;
+ }
+ break;
+
+ case AF_INET6:
+ r = sd_netlink_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6);
+ if (r < 0) {
+ r = sd_netlink_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6);
+ if (r < 0)
+ continue;
+ }
+ break;
+
+ default:
+ continue;
+ }
+
+ a->ifindex = ifi;
+ a->family = family;
+
+ n_list++;
+ };
+
+ if (n_list > 0)
+ qsort(list, n_list, sizeof(struct local_address), address_compare);
+
+ *ret = list;
+ list = NULL;
+
+ return (int) n_list;
+}
+
+int local_gateways(sd_netlink *context, int ifindex, int af, struct local_address **ret) {
+ _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL;
+ _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
+ _cleanup_free_ struct local_address *list = NULL;
+ sd_netlink_message *m = NULL;
+ size_t n_list = 0, n_allocated = 0;
+ int r;
+
+ assert(ret);
+
+ if (context)
+ rtnl = sd_netlink_ref(context);
+ else {
+ r = sd_netlink_open(&rtnl);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_rtnl_message_new_route(rtnl, &req, RTM_GETROUTE, af, RTPROT_UNSPEC);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_request_dump(req, true);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_call(rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (m = reply; m; m = sd_netlink_message_next(m)) {
+ struct local_address *a;
+ uint16_t type;
+ unsigned char dst_len, src_len;
+ uint32_t ifi;
+ int family;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_get_type(m, &type);
+ if (r < 0)
+ return r;
+ if (type != RTM_NEWROUTE)
+ continue;
+
+ /* We only care for default routes */
+ r = sd_rtnl_message_route_get_dst_prefixlen(m, &dst_len);
+ if (r < 0)
+ return r;
+ if (dst_len != 0)
+ continue;
+
+ r = sd_rtnl_message_route_get_src_prefixlen(m, &src_len);
+ if (r < 0)
+ return r;
+ if (src_len != 0)
+ continue;
+
+ r = sd_netlink_message_read_u32(m, RTA_OIF, &ifi);
+ if (r < 0)
+ return r;
+ if (ifindex > 0 && (int) ifi != ifindex)
+ continue;
+
+ r = sd_rtnl_message_route_get_family(m, &family);
+ if (r < 0)
+ return r;
+ if (af != AF_UNSPEC && af != family)
+ continue;
+
+ if (!GREEDY_REALLOC0(list, n_allocated, n_list + 1))
+ return -ENOMEM;
+
+ a = list + n_list;
+
+ switch (family) {
+ case AF_INET:
+ r = sd_netlink_message_read_in_addr(m, RTA_GATEWAY, &a->address.in);
+ if (r < 0)
+ continue;
+
+ break;
+ case AF_INET6:
+ r = sd_netlink_message_read_in6_addr(m, RTA_GATEWAY, &a->address.in6);
+ if (r < 0)
+ continue;
+
+ break;
+ default:
+ continue;
+ }
+
+ sd_netlink_message_read_u32(m, RTA_PRIORITY, &a->metric);
+
+ a->ifindex = ifi;
+ a->family = family;
+
+ n_list++;
+ }
+
+ if (n_list > 0)
+ qsort(list, n_list, sizeof(struct local_address), address_compare);
+
+ *ret = list;
+ list = NULL;
+
+ return (int) n_list;
+}
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