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| author | Yu Watanabe <watanabe.yu+github@gmail.com> | 2022-01-20 21:02:42 +0100 |
|---|---|---|
| committer | Yu Watanabe <watanabe.yu+github@gmail.com> | 2022-01-20 21:02:42 +0100 |
| commit | 61e964df713b5930a049053a0c4059521007b596 (patch) | |
| tree | 96ed610edc1189ff6a033424f0f3dcc61736f228 /src/shared/netif-util.c | |
| parent | resolve: drop redundant call of link_allocate_scopes() and link_add_rrs() (diff) | |
| download | systemd-61e964df713b5930a049053a0c4059521007b596.tar.xz systemd-61e964df713b5930a049053a0c4059521007b596.zip | |
netif-util: introduce netif_has_carrier()
Diffstat (limited to 'src/shared/netif-util.c')
| -rw-r--r-- | src/shared/netif-util.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/shared/netif-util.c b/src/shared/netif-util.c index 603d4de109..69d7cc2b10 100644 --- a/src/shared/netif-util.c +++ b/src/shared/netif-util.c @@ -1,5 +1,6 @@ /* SPDX-License-Identifier: LGPL-2.1-or-later */ +#include <linux/if.h> #include <linux/if_arp.h> #include "arphrd-util.h" @@ -11,6 +12,20 @@ #include "sparse-endian.h" #include "strv.h" +bool netif_has_carrier(uint8_t operstate, unsigned flags) { + /* see Documentation/networking/operstates.txt in the kernel sources */ + + if (operstate == IF_OPER_UP) + return true; + + if (operstate != IF_OPER_UNKNOWN) + return false; + + /* operstate may not be implemented, so fall back to flags */ + return FLAGS_SET(flags, IFF_LOWER_UP | IFF_RUNNING) && + !FLAGS_SET(flags, IFF_DORMANT); +} + int net_get_type_string(sd_device *device, uint16_t iftype, char **ret) { const char *t; char *p; |