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-rw-r--r--src/libsystemd-network/dhcp-lease-internal.h2
-rw-r--r--src/libsystemd-network/sd-dhcp-lease.c21
-rw-r--r--src/shared/in-addr-util.c13
3 files changed, 10 insertions, 26 deletions
diff --git a/src/libsystemd-network/dhcp-lease-internal.h b/src/libsystemd-network/dhcp-lease-internal.h
index d4675f3e47..9fb4f4b4e4 100644
--- a/src/libsystemd-network/dhcp-lease-internal.h
+++ b/src/libsystemd-network/dhcp-lease-internal.h
@@ -35,7 +35,7 @@
struct sd_dhcp_route {
struct in_addr dst_addr;
struct in_addr gw_addr;
- uint8_t dst_prefixlen;
+ unsigned char dst_prefixlen;
};
struct sd_dhcp_lease {
diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c
index f4979f7da7..f6b572a996 100644
--- a/src/libsystemd-network/sd-dhcp-lease.c
+++ b/src/libsystemd-network/sd-dhcp-lease.c
@@ -310,23 +310,6 @@ static int lease_parse_in_addrs_pairs(const uint8_t *option, size_t len, struct
return lease_parse_in_addrs_aux(option, len, ret, ret_size, 2);
}
-static int class_prefixlen(uint8_t msb_octet, uint8_t *ret) {
- if (msb_octet < 128)
- /* Class A */
- *ret = 8;
- else if (msb_octet < 192)
- /* Class B */
- *ret = 16;
- else if (msb_octet < 224)
- /* Class C */
- *ret = 24;
- else
- /* Class D or E -- no subnet mask */
- return -ERANGE;
-
- return 0;
-}
-
static int lease_parse_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
size_t *routes_size, size_t *routes_allocated) {
@@ -348,8 +331,10 @@ static int lease_parse_routes(const uint8_t *option, size_t len, struct sd_dhcp_
while (len >= 8) {
struct sd_dhcp_route *route = *routes + *routes_size;
+ int r;
- if (class_prefixlen(*option, &route->dst_prefixlen) < 0) {
+ r = in_addr_default_prefixlen((struct in_addr*) option, &route->dst_prefixlen);
+ if (r < 0) {
log_error("Failed to determine destination prefix length from class based IP, ignoring");
continue;
}
diff --git a/src/shared/in-addr-util.c b/src/shared/in-addr-util.c
index 5fbee6caf2..9dc9ec82b4 100644
--- a/src/shared/in-addr-util.c
+++ b/src/shared/in-addr-util.c
@@ -250,21 +250,20 @@ unsigned in_addr_netmask_to_prefixlen(const struct in_addr *addr) {
}
int in_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen) {
- uint32_t address;
+ uint8_t msb_octet = *(uint8_t*) addr;
+
+ /* addr may not be aligned, so make sure we only access it byte-wise */
assert(addr);
- assert(addr->s_addr != INADDR_ANY);
assert(prefixlen);
- address = be32toh(addr->s_addr);
-
- if ((address >> 31) == 0x0)
+ if (msb_octet < 128)
/* class A, leading bits: 0 */
*prefixlen = 8;
- else if ((address >> 30) == 0x2)
+ else if (msb_octet < 192)
/* class B, leading bits 10 */
*prefixlen = 16;
- else if ((address >> 29) == 0x6)
+ else if (msb_octet < 224)
/* class C, leading bits 110 */
*prefixlen = 24;
else