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authordimitri staessens <dimitri.staessens@intec.ugent.be>2016-07-28 15:16:22 +0200
committerdimitri staessens <dimitri.staessens@intec.ugent.be>2016-07-28 15:16:22 +0200
commit2d529f912c089033e2f40fd0978ccb741bfe2bbb (patch)
tree4ca3c80bb23d6d2cad506d0d48bdb206fa98b480 /src/ipcpd/shim-eth-llc/main.c
parent67de2ae5f7aee25c077096bd90a8d4cd3cdcf094 (diff)
parent240f0f897d5f84230d4bb3592ddfeecb2f4fa586 (diff)
downloadouroboros-2d529f912c089033e2f40fd0978ccb741bfe2bbb.tar.gz
ouroboros-2d529f912c089033e2f40fd0978ccb741bfe2bbb.zip
Merged in sandervrijders/ouroboros/be-llc-len (pull request #180)
ipcpd: shim-eth-llc: Use correct frame length
Diffstat (limited to 'src/ipcpd/shim-eth-llc/main.c')
-rw-r--r--src/ipcpd/shim-eth-llc/main.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/src/ipcpd/shim-eth-llc/main.c b/src/ipcpd/shim-eth-llc/main.c
index 87458359..c2309272 100644
--- a/src/ipcpd/shim-eth-llc/main.c
+++ b/src/ipcpd/shim-eth-llc/main.c
@@ -614,6 +614,7 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
uint8_t dst_mac[MAC_SIZE];
uint8_t br_addr[MAC_SIZE];
int frame_len = 0;
+ int len_frame = 0;
uint8_t ssap = 0;
uint8_t dsap = 0;
int i = 0;
@@ -694,6 +695,9 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
#endif
continue;
}
+
+ len_frame = ((buf[i]) << 8) + buf[i + 1];
+ len_frame -= 3;
i += 2;
dsap = reverse_bits(buf[i++]);
@@ -702,6 +706,15 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
frame_len -= i;
+ /*
+ * Take minimum of length reported in frame
+ * and frame length reported by kernel. Some device
+ * drivers change the length in the frame. Some
+ * others add padding, making the length reported
+ * by the kernel too high. Sigh. Lousy workaround.
+ */
+ frame_len = MIN(frame_len, len_frame);
+
if (ssap == MGMT_SAP &&
dsap == MGMT_SAP) {
eth_llc_ipcp_mgmt_frame((uint8_t *) (buf + i),
@@ -712,7 +725,8 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
j = addr_and_saps_to_index(src_mac, ssap, dsap);
if (j < 0) {
- pthread_rwlock_unlock(&shim_data(_ipcp)->flows_lock);
+ pthread_rwlock_unlock(&shim_data(_ipcp)->
+ flows_lock);
pthread_rwlock_unlock(&_ipcp->state_lock);
#if defined(PACKET_RX_RING) && defined(PACKET_TX_RING)
offset = (offset + 1)