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udev: link-config - let udevd set the ifname

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This commit is contained in:
Tom Gundersen 2013-10-30 04:10:19 +01:00
parent 415e7f65db
commit 3e137a1b9a
8 changed files with 67 additions and 32 deletions
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2
Makefile.am
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@ -2234,7 +2234,7 @@ dist_udevrules_DATA += \
rules/75-net-description.rules \
rules/75-tty-description.rules \
rules/78-sound-card.rules \
rules/85-net-configure-link.rules \
rules/80-net-setup-link.rules \
rules/95-udev-late.rules
dist_udevhwdb_DATA = \

4
rules/85-net-configure-link.rules → rules/80-net-setup-link.rules
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@ -6,6 +6,8 @@ IMPORT{builtin}="path_id"
ACTION!="add", GOTO="net_setup_link_end"
RUN{builtin}="net_setup_link"
IMPORT{builtin}="net_setup_link"
NAME=="", ENV{ID_NET_NAME}!="", NAME="$env{ID_NET_NAME}"
LABEL="net_setup_link_end"

38
src/libsystemd-rtnl/rtnl-util.c
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@ -25,26 +25,44 @@
#include "rtnl-util.h"
int rtnl_set_link_properties(sd_rtnl *rtnl, int ifindex, const char *name, const struct ether_addr *mac, unsigned mtu) {
_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message;
int rtnl_set_link_name(sd_rtnl *rtnl, int ifindex, const char *name) {
_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message = NULL;
int r;
assert(rtnl);
assert(ifindex > 0);
assert(name);
r = sd_rtnl_message_link_new(RTM_NEWLINK, ifindex, 0, 0, &message);
if (r < 0)
return r;
r = sd_rtnl_message_append(message, IFLA_IFNAME, name);
if (r < 0)
return r;
r = sd_rtnl_send_with_reply_and_block(rtnl, message, 0, NULL);
if (r < 0)
return r;
return 0;
}
int rtnl_set_link_properties(sd_rtnl *rtnl, int ifindex, const struct ether_addr *mac, unsigned mtu) {
_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message = NULL;
bool need_update = false;
int r;
assert(rtnl);
assert(ifindex > 0);
if (!mac && mtu == 0)
return 0;
r = sd_rtnl_message_link_new(RTM_NEWLINK, ifindex, 0, 0, &message);
if (r < 0)
return r;
if (name) {
r = sd_rtnl_message_append(message, IFLA_IFNAME, name);
if (r < 0)
return r;
need_update = true;
}
if (mac) {
r = sd_rtnl_message_append(message, IFLA_ADDRESS, mac);
if (r < 0)

3
src/libsystemd-rtnl/rtnl-util.h
View File

@ -23,4 +23,5 @@
#include "sd-rtnl.h"
int rtnl_set_link_properties(sd_rtnl *rtnl, int ifindex, const char *name, const struct ether_addr *mac, unsigned mtu);
int rtnl_set_link_name(sd_rtnl *rtnl, int ifindex, const char *name);
int rtnl_set_link_properties(sd_rtnl *rtnl, int ifindex, const struct ether_addr *mac, unsigned mtu);

42
src/udev/net/link-config.c
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@ -280,8 +280,10 @@ static bool enable_name_policy(void) {
}
FOREACH_WORD_QUOTED(w, l, line, state)
if (strneq(w, "net.ifnames=0", l))
if (strneq(w, "net.ifnames=0", l)) {
log_info("Link name policy disabled on kernel commandline, ignoring.");
return false;
}
return true;
}
@ -365,40 +367,45 @@ static int get_mac(struct udev_device *device, bool want_random, struct ether_ad
return 0;
}
int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device) {
const char *name;
int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) {
const char *old_name;
const char *new_name = NULL;
struct ether_addr generated_mac;
struct ether_addr *mac = NULL;
int r, ifindex;
assert(ctx);
assert(config);
assert(device);
assert(name);
r = link_config_ctx_connect(ctx);
if (r < 0)
return r;
name = udev_device_get_sysname(device);
if (!name)
old_name = udev_device_get_sysname(device);
if (!old_name)
return -EINVAL;
log_info("Configuring %s", name);
log_info("Configuring %s", old_name);
if (config->description) {
r = udev_device_set_sysattr_value(device, "ifalias",
config->description);
if (r < 0)
log_warning("Could not set description of %s to '%s': %s",
name, config->description, strerror(-r));
old_name, config->description, strerror(-r));
}
r = ethtool_set_speed(ctx->ethtool_fd, name, config->speed, config->duplex);
r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed, config->duplex);
if (r < 0)
log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s",
name, config->speed, duplex_to_string(config->duplex), strerror(-r));
old_name, config->speed, duplex_to_string(config->duplex), strerror(-r));
r = ethtool_set_wol(ctx->ethtool_fd, name, config->wol);
r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
if (r < 0)
log_warning("Could not set WakeOnLan of %s to %s: %s",
name, wol_to_string(config->wol), strerror(-r));
old_name, wol_to_string(config->wol), strerror(-r));
ifindex = udev_device_get_ifindex(device);
if (ifindex <= 0) {
@ -429,9 +436,12 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev
}
}
if (!new_name && config->name) {
new_name = config->name;
}
if (new_name)
*name = new_name; /* a name was set by a policy */
else if (config->name)
*name = config->name; /* a name was set manually in the config */
else
*name = NULL;
switch (config->mac_policy) {
case MACPOLICY_PERSISTENT:
@ -454,9 +464,9 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev
mac = config->mac;
}
r = rtnl_set_link_properties(ctx->rtnl, ifindex, new_name, mac, config->mtu);
r = rtnl_set_link_properties(ctx->rtnl, ifindex, mac, config->mtu);
if (r < 0) {
log_warning("Could not set Name, MACAddress or MTU on %s: %s", name, strerror(-r));
log_warning("Could not set MACAddress or MTU on %s: %s", old_name, strerror(-r));
return r;
}

2
src/udev/net/link-config.h
View File

@ -74,7 +74,7 @@ int link_config_load(link_config_ctx *ctx);
bool link_config_should_reload(link_config_ctx *ctx);
int link_config_get(link_config_ctx *ctx, struct udev_device *device, struct link_config **ret);
int link_config_apply(link_config_ctx *ctx, struct link_config *config, struct udev_device *device);
int link_config_apply(link_config_ctx *ctx, struct link_config *config, struct udev_device *device, const char **name);
const char *name_policy_to_string(NamePolicy p) _const_;
NamePolicy name_policy_from_string(const char *p) _pure_;

6
src/udev/udev-builtin-net_setup_link.c
View File

@ -26,6 +26,7 @@
link_config_ctx *ctx;
static int builtin_net_setup_link(struct udev_device *dev, int argc, char **argv, bool test) {
const char *name;
link_config *link;
int r;
@ -45,12 +46,15 @@ static int builtin_net_setup_link(struct udev_device *dev, int argc, char **argv
}
}
r = link_config_apply(ctx, link, dev);
r = link_config_apply(ctx, link, dev, &name);
if (r < 0) {
log_error("Could not apply link config to %s", udev_device_get_sysname(dev));
return EXIT_FAILURE;
}
if (name)
udev_builtin_add_property(dev, test, "ID_NET_NAME", name);
return EXIT_SUCCESS;
}

2
src/udev/udev-event.c
View File

@ -764,7 +764,7 @@ static int rename_netif(struct udev_event *event)
if (r < 0)
return r;
r = rtnl_set_link_properties(rtnl, udev_device_get_ifindex(dev), name, NULL, 0);
r = rtnl_set_link_name(rtnl, udev_device_get_ifindex(dev), name);
if (r < 0)
log_error("error changing net interface name %s to %s: %s",
oldname, name, strerror(-r));