[systemd-commits] 2 commits - src/libsystemd-network src/network

Tom Gundersen tomegun at kemper.freedesktop.org
Tue Jun 17 00:17:14 PDT 2014


 src/libsystemd-network/dhcp-internal.h    |    2 -
 src/libsystemd-network/dhcp-packet.c      |   51 ++++++++++--------------------
 src/libsystemd-network/test-dhcp-client.c |    6 +--
 src/network/networkd-link.c               |    2 -
 4 files changed, 23 insertions(+), 38 deletions(-)

New commits:
commit bf0308cbd5362c697fe4df82b2e8b9adc743eb6c
Author: Tom Gundersen <teg at jklm.no>
Date:   Tue Jun 17 08:54:44 2014 +0200

    networkd: link - fix carrier check on new link
    
    We were comparing against our own internal enum rather than the kernel exposed one.
    
    Found by Thomas Ritter.

diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 7c738fe..d81a3bf 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1764,7 +1764,7 @@ static int link_configure(Link *link) {
                 */
         }
 
-        if (link_has_carrier(link->flags, link->operstate)) {
+        if (link_has_carrier(link->flags, link->kernel_operstate)) {
                 r = link_acquire_conf(link);
                 if (r < 0)
                         return r;

commit 0bbc2c1f3b8f01eac7826dab1a3e1e073f63da8a
Author: Tom Gundersen <teg at jklm.no>
Date:   Mon Jun 16 15:24:28 2014 +0200

    sd-dhcp: checksum - make endianess-neutral
    
    For efficiency, we group bytes together before adding them up. This
    is guaranteed to always work (regardless of the byte order) as long
    as the i-th byte in each group lign up with the i-th byte in each
    other group.
    
    On big-endian machines this broke when handling the trailing few bytes
    which did not make up a full group of 4 bytes. This patch fixes the
    problem by explicitly creating a 4 byte zero-padded group out of the
    trailing bytes.
    
    Reported and tested by Thomas Ritter <th.ritter at gmx.at>.

diff --git a/src/libsystemd-network/dhcp-internal.h b/src/libsystemd-network/dhcp-internal.h
index 76d357a..03cc824 100644
--- a/src/libsystemd-network/dhcp-internal.h
+++ b/src/libsystemd-network/dhcp-internal.h
@@ -48,7 +48,7 @@ int dhcp_option_parse(DHCPMessage *message, size_t len,
 int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid, uint8_t type,
                       size_t optlen, size_t *optoffset);
 
-uint16_t dhcp_packet_checksum(void *buf, size_t len);
+uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len);
 
 void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
                                    uint16_t source, be32_t destination_addr,
diff --git a/src/libsystemd-network/dhcp-packet.c b/src/libsystemd-network/dhcp-packet.c
index 3e2fb96..9f850fd 100644
--- a/src/libsystemd-network/dhcp-packet.c
+++ b/src/libsystemd-network/dhcp-packet.c
@@ -60,47 +60,32 @@ int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid,
         return 0;
 }
 
-uint16_t dhcp_packet_checksum(void *buf, size_t len) {
-        uint64_t *buf_64 = buf;
-        uint64_t *end_64 = (uint64_t*)buf + (len / sizeof(uint64_t));
-        uint32_t *buf_32;
-        uint16_t *buf_16;
-        uint8_t *buf_8;
+uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len) {
+        uint64_t *buf_64 = (uint64_t*)buf;
+        uint64_t *end_64 = buf_64 + (len / sizeof(uint64_t));
         uint64_t sum = 0;
 
+        /* See RFC1071 */
+
         while (buf_64 < end_64) {
                 sum += *buf_64;
                 if (sum < *buf_64)
+                        /* wrap around in one's complement */
                         sum++;
 
                 buf_64 ++;
         }
 
-        buf_32 = (uint32_t*)buf_64;
-
-        if (len & sizeof(uint32_t)) {
-                sum += *buf_32;
-                if (sum < *buf_32)
-                        sum++;
-
-                buf_32 ++;
-        }
-
-        buf_16 = (uint16_t*)buf_32;
-
-        if (len & sizeof(uint16_t)) {
-                sum += *buf_16;
-                if (sum < *buf_16)
-                        sum ++;
-
-                buf_16 ++;
-        }
+        if (len % sizeof(uint64_t)) {
+                /* If the buffer is not aligned to 64-bit, we need
+                   to zero-pad the last few bytes and add them in */
+                uint64_t buf_tail = 0;
 
-        buf_8 = (uint8_t*)buf_16;
+                memcpy(&buf_tail, buf_64, len % sizeof(uint64_t));
 
-        if (len & sizeof(uint8_t)) {
-                sum += *buf_8;
-                if (sum < *buf_8)
+                sum += buf_tail;
+                if (sum < buf_tail)
+                        /* wrap around */
                         sum++;
         }
 
@@ -129,11 +114,11 @@ void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
         packet->udp.len = htobe16(len - DHCP_IP_SIZE);
 
         packet->ip.check = packet->udp.len;
-        packet->udp.check = dhcp_packet_checksum(&packet->ip.ttl, len - 8);
+        packet->udp.check = dhcp_packet_checksum((uint8_t*)&packet->ip.ttl, len - 8);
 
         packet->ip.ttl = IPDEFTTL;
         packet->ip.check = 0;
-        packet->ip.check = dhcp_packet_checksum(&packet->ip, DHCP_IP_SIZE);
+        packet->ip.check = dhcp_packet_checksum((uint8_t*)&packet->ip, DHCP_IP_SIZE);
 }
 
 int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) {
@@ -193,7 +178,7 @@ int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) {
            if all the other checks have passed
          */
 
-        if (dhcp_packet_checksum(&packet->ip, hdrlen)) {
+        if (dhcp_packet_checksum((uint8_t*)&packet->ip, hdrlen)) {
                 log_debug("ignoring packet: invalid IP checksum");
                 return -EINVAL;
         }
@@ -202,7 +187,7 @@ int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) {
                 packet->ip.check = packet->udp.len;
                 packet->ip.ttl = 0;
 
-                if (dhcp_packet_checksum(&packet->ip.ttl,
+                if (dhcp_packet_checksum((uint8_t*)&packet->ip.ttl,
                                   be16toh(packet->udp.len) + 12)) {
                         log_debug("ignoring packet: invalid UDP checksum");
                         return -EINVAL;
diff --git a/src/libsystemd-network/test-dhcp-client.c b/src/libsystemd-network/test-dhcp-client.c
index 599bda1..450b6d4 100644
--- a/src/libsystemd-network/test-dhcp-client.c
+++ b/src/libsystemd-network/test-dhcp-client.c
@@ -128,7 +128,7 @@ static void test_checksum(void)
         if (verbose)
                 printf("* %s\n", __FUNCTION__);
 
-        assert_se(dhcp_packet_checksum(&buf, 20) == be16toh(0x78ae));
+        assert_se(dhcp_packet_checksum((uint8_t*)&buf, 20) == be16toh(0x78ae));
 }
 
 static int check_options(uint8_t code, uint8_t len, const uint8_t *option,
@@ -175,13 +175,13 @@ int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
         discover->ip.ttl = 0;
         discover->ip.check = discover->udp.len;
 
-        udp_check = ~dhcp_packet_checksum(&discover->ip.ttl, len - 8);
+        udp_check = ~dhcp_packet_checksum((uint8_t*)&discover->ip.ttl, len - 8);
         assert_se(udp_check == 0xffff);
 
         discover->ip.ttl = IPDEFTTL;
         discover->ip.check = ip_check;
 
-        ip_check = ~dhcp_packet_checksum(&discover->ip, sizeof(discover->ip));
+        ip_check = ~dhcp_packet_checksum((uint8_t*)&discover->ip, sizeof(discover->ip));
         assert_se(ip_check == 0xffff);
 
         assert_se(discover->dhcp.xid);



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