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From 8db22aec9bfd140855b64f2879b7ca6d1cba69c6 Mon Sep 17 00:00:00 2001
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From: Yu Watanabe <watanabe.yu+github@gmail.com>
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Date: Tue, 17 Dec 2019 18:28:36 +0900
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Subject: [PATCH] sd-netlink: introduce rtnl_resolve_link_alternative_names()
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(cherry picked from commit b04c5e51da7a61d41d564e73a1e92bd8b29b0223)
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Related: #1850986
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---
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src/libsystemd/sd-netlink/netlink-types.c | 1 +
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src/libsystemd/sd-netlink/netlink-util.c | 29 +++++++++++++++++++++++
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src/libsystemd/sd-netlink/netlink-util.h | 1 +
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3 files changed, 31 insertions(+)
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diff --git a/src/libsystemd/sd-netlink/netlink-types.c b/src/libsystemd/sd-netlink/netlink-types.c
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index 47d9c7f1c4..e118a0aa30 100644
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--- a/src/libsystemd/sd-netlink/netlink-types.c
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+++ b/src/libsystemd/sd-netlink/netlink-types.c
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@@ -511,6 +511,7 @@ static const NLType rtnl_link_types[] = {
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[IFLA_PHYS_PORT_ID] = { .type = NETLINK_TYPE_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
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*/
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[IFLA_PROP_LIST] = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_prop_list_type_system },
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+ [IFLA_ALT_IFNAME] = { .type = NETLINK_TYPE_STRING, .size = ALTIFNAMSIZ - 1 },
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};
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static const NLTypeSystem rtnl_link_type_system = {
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diff --git a/src/libsystemd/sd-netlink/netlink-util.c b/src/libsystemd/sd-netlink/netlink-util.c
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index c1c306f121..62fc71a3d8 100644
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--- a/src/libsystemd/sd-netlink/netlink-util.c
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+++ b/src/libsystemd/sd-netlink/netlink-util.c
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@@ -120,6 +120,35 @@ int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const
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return 0;
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}
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+int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name, int *ret) {
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+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL;
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+ int r;
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+
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+ assert(rtnl);
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+ assert(name);
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+ assert(ret);
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+
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+ if (!*rtnl) {
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+ r = sd_netlink_open(rtnl);
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+ if (r < 0)
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+ return r;
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+ }
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+
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+ r = sd_rtnl_message_new_link(*rtnl, &message, RTM_GETLINK, 0);
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+ if (r < 0)
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+ return r;
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+
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+ r = sd_netlink_message_append_string(message, IFLA_ALT_IFNAME, name);
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+ if (r < 0)
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+ return r;
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+
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+ r = sd_netlink_call(*rtnl, message, 0, &reply);
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+ if (r < 0)
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+ return r;
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+
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+ return sd_rtnl_message_link_get_ifindex(reply, ret);
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+}
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+
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int rtnl_message_new_synthetic_error(sd_netlink *rtnl, int error, uint32_t serial, sd_netlink_message **ret) {
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struct nlmsgerr *err;
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int r;
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diff --git a/src/libsystemd/sd-netlink/netlink-util.h b/src/libsystemd/sd-netlink/netlink-util.h
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index 92de19c092..ea98439fad 100644
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--- a/src/libsystemd/sd-netlink/netlink-util.h
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+++ b/src/libsystemd/sd-netlink/netlink-util.h
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@@ -39,6 +39,7 @@ static inline bool rtnl_message_type_is_routing_policy_rule(uint16_t type) {
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int rtnl_set_link_name(sd_netlink **rtnl, int ifindex, const char *name);
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int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias, const struct ether_addr *mac, uint32_t mtu);
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int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names);
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+int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name, int *ret);
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int rtnl_log_parse_error(int r);
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int rtnl_log_create_error(int r);
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