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sd-radv: refuse to set preference except medium when router lifetime is zero

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This commit is contained in:
Yu Watanabe 2020-11-09 16:41:17 +09:00
parent ac138551ce
commit dd1b187075
1 changed files with 6 additions and 3 deletions
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9
src/libsystemd-network/sd-radv.c
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@ -506,17 +506,20 @@ _public_ int sd_radv_set_other_information(sd_radv *ra, int other) {
}
_public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) {
int r = 0;
assert_return(ra, -EINVAL);
assert_return(IN_SET(preference,
SD_NDISC_PREFERENCE_LOW,
SD_NDISC_PREFERENCE_MEDIUM,
SD_NDISC_PREFERENCE_HIGH), -EINVAL);
/* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set
* to (00) by the sender..." */
if (ra->lifetime == 0 && preference != SD_NDISC_PREFERENCE_MEDIUM)
return -EINVAL;
ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3);
return r;
return 0;
}
_public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, int dynamic) {