diff options
Diffstat (limited to 'src/libsystemd-network/dhcp-identifier.c')
-rw-r--r-- | src/libsystemd-network/dhcp-identifier.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/src/libsystemd-network/dhcp-identifier.c b/src/libsystemd-network/dhcp-identifier.c index d58f9029cc..906d960171 100644 --- a/src/libsystemd-network/dhcp-identifier.c +++ b/src/libsystemd-network/dhcp-identifier.c @@ -31,6 +31,37 @@ #define SYSTEMD_PEN 43793 #define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09) +int dhcp_validate_duid_len(uint16_t duid_type, size_t duid_len) { + struct duid d; + + assert_cc(sizeof(d.raw) >= MAX_DUID_LEN); + if (duid_len > MAX_DUID_LEN) + return -EINVAL; + + switch (duid_type) { + case DUID_TYPE_LLT: + if (duid_len <= sizeof(d.llt)) + return -EINVAL; + break; + case DUID_TYPE_EN: + if (duid_len != sizeof(d.en)) + return -EINVAL; + break; + case DUID_TYPE_LL: + if (duid_len <= sizeof(d.ll)) + return -EINVAL; + break; + case DUID_TYPE_UUID: + if (duid_len != sizeof(d.uuid)) + return -EINVAL; + break; + default: + /* accept unknown type in order to be forward compatible */ + break; + } + return 0; +} + int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) { sd_id128_t machine_id; uint64_t hash; @@ -43,7 +74,7 @@ int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) { if (r < 0) return r; - unaligned_write_be16(&duid->type, DHCP6_DUID_EN); + unaligned_write_be16(&duid->type, DUID_TYPE_EN); unaligned_write_be32(&duid->en.pen, SYSTEMD_PEN); *len = sizeof(duid->type) + sizeof(duid->en); |