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From 8f946da7ee9bbb6e52e99b452c1f4f6f76e7b3c2 Mon Sep 17 00:00:00 2001
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From: Yu Watanabe <watanabe.yu+github@gmail.com>
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Date: Fri, 17 Jul 2020 21:29:13 +0900
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Subject: [PATCH] netlink: introduce rtnl_get/delete_link_alternative_names()
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(cherry picked from commit 14982526145de84201c7e3b4fc6be6aa5e9a08f7)
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Related: #1850986
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---
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src/libsystemd/sd-netlink/netlink-util.c | 45 ++++++++++++++++++++++--
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src/libsystemd/sd-netlink/netlink-util.h | 2 ++
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2 files changed, 45 insertions(+), 2 deletions(-)
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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 62fc71a3d8..7f09261981 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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@@ -81,12 +81,45 @@ int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias,
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return 0;
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}
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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_get_link_alternative_names(sd_netlink **rtnl, int ifindex, char ***ret) {
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+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL;
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+ _cleanup_strv_free_ char **names = NULL;
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+ int r;
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+
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+ assert(rtnl);
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+ assert(ifindex > 0);
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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, ifindex);
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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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+ r = sd_netlink_message_read_strv(reply, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &names);
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+ if (r < 0 && r != -ENODATA)
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+ return r;
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+
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+ *ret = TAKE_PTR(names);
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+
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+ return 0;
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+}
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+
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+static int rtnl_update_link_alternative_names(sd_netlink **rtnl, uint16_t nlmsg_type, int ifindex, char * const *alternative_names) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
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int r;
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assert(rtnl);
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assert(ifindex > 0);
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+ assert(IN_SET(nlmsg_type, RTM_NEWLINKPROP, RTM_DELLINKPROP));
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if (strv_isempty(alternative_names))
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return 0;
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@@ -97,7 +130,7 @@ int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const
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return r;
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}
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- r = sd_rtnl_message_new_link(*rtnl, &message, RTM_NEWLINKPROP, ifindex);
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+ r = sd_rtnl_message_new_link(*rtnl, &message, nlmsg_type, ifindex);
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if (r < 0)
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return r;
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@@ -120,6 +153,14 @@ 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_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names) {
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+ return rtnl_update_link_alternative_names(rtnl, RTM_NEWLINKPROP, ifindex, alternative_names);
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+}
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+
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+int rtnl_delete_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names) {
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+ return rtnl_update_link_alternative_names(rtnl, RTM_DELLINKPROP, ifindex, alternative_names);
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+}
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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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diff --git a/src/libsystemd/sd-netlink/netlink-util.h b/src/libsystemd/sd-netlink/netlink-util.h
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index ea98439fad..4fc31aa274 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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@@ -38,7 +38,9 @@ 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_get_link_alternative_names(sd_netlink **rtnl, int ifindex, char ***ret);
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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_delete_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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