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authorSander Vrijders <sander.vrijders@ugent.be>2017-04-05 16:42:42 +0200
committerSander Vrijders <sander.vrijders@ugent.be>2017-04-05 16:42:42 +0200
commitf309ed3048c0813262c2cf4c7db24befc1729b3a (patch)
tree040768e8cbb4fd274ad9a4854cad318fdccf0d17 /src/ipcpd
parent7ba8e234b6c45774b54d24e632cb14730a62b0b3 (diff)
downloadouroboros-f309ed3048c0813262c2cf4c7db24befc1729b3a.tar.gz
ouroboros-f309ed3048c0813262c2cf4c7db24befc1729b3a.zip
ipcpd: shim-eth-llc: Fix overwrite mgmt frames
This fixes the overwriting of management frames by adding a list in the shim Ethernet that keeps track of management frames instead of a single buffer.
Diffstat (limited to 'src/ipcpd')
-rw-r--r--src/ipcpd/shim-eth-llc/main.c63
1 files changed, 42 insertions, 21 deletions
diff --git a/src/ipcpd/shim-eth-llc/main.c b/src/ipcpd/shim-eth-llc/main.c
index 142ca680..34a25ee2 100644
--- a/src/ipcpd/shim-eth-llc/main.c
+++ b/src/ipcpd/shim-eth-llc/main.c
@@ -96,6 +96,13 @@ struct ef {
uint8_t r_addr[MAC_SIZE];
};
+struct mgmt_frame {
+ struct list_head next;
+ uint8_t r_addr[MAC_SIZE];
+ uint8_t buf[ETH_FRAME_SIZE];
+ size_t len;
+};
+
struct {
#ifdef __FreeBSD__
struct sockaddr_dl device;
@@ -118,10 +125,8 @@ struct {
pthread_t mgmt_handler;
pthread_mutex_t mgmt_lock;
pthread_cond_t mgmt_cond;
- uint8_t mgmt_r_addr[MAC_SIZE];
- uint8_t mgmt_buf[ETH_FRAME_SIZE];
- size_t mgmt_len;
- bool mgmt_arrived;
+ struct list_head mgmt_frames;
+
} eth_llc_data;
static int eth_llc_data_init(void)
@@ -183,6 +188,8 @@ static int eth_llc_data_init(void)
if (pthread_cond_init(&eth_llc_data.mgmt_cond, &cattr))
goto mgmt_lock_destroy;
+ list_head_init(&eth_llc_data.mgmt_frames);
+
return 0;
mgmt_lock_destroy:
@@ -488,10 +495,11 @@ static int eth_llc_ipcp_mgmt_frame(uint8_t * buf,
static void * eth_llc_ipcp_mgmt_handler(void * o)
{
- int ret;
- struct timespec timeout = {(MGMT_TIMEOUT / 1000),
- (MGMT_TIMEOUT % 1000) * MILLION};
- struct timespec abstime;
+ int ret;
+ struct timespec timeout = {(MGMT_TIMEOUT / 1000),
+ (MGMT_TIMEOUT % 1000) * MILLION};
+ struct timespec abstime;
+ struct mgmt_frame * frame;
(void) o;
@@ -506,7 +514,8 @@ static void * eth_llc_ipcp_mgmt_handler(void * o)
pthread_mutex_lock(&eth_llc_data.mgmt_lock);
- while (!eth_llc_data.mgmt_arrived && ret != -ETIMEDOUT)
+ while (list_is_empty(&eth_llc_data.mgmt_frames) &&
+ ret != -ETIMEDOUT)
ret = -pthread_cond_timedwait(&eth_llc_data.mgmt_cond,
&eth_llc_data.mgmt_lock,
&abstime);
@@ -516,10 +525,18 @@ static void * eth_llc_ipcp_mgmt_handler(void * o)
continue;
}
- eth_llc_ipcp_mgmt_frame(eth_llc_data.mgmt_buf,
- eth_llc_data.mgmt_len,
- eth_llc_data.mgmt_r_addr);
- eth_llc_data.mgmt_arrived = false;
+ frame = list_first_entry((&eth_llc_data.mgmt_frames),
+ struct mgmt_frame, next);
+ if (frame == NULL) {
+ pthread_mutex_unlock(&eth_llc_data.mgmt_lock);
+ continue;
+ }
+
+ eth_llc_ipcp_mgmt_frame(frame->buf, frame->len, frame->r_addr);
+
+ list_del(&frame->next);
+ free(frame);
+
pthread_mutex_unlock(&eth_llc_data.mgmt_lock);
}
}
@@ -534,6 +551,7 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
uint8_t buf[ETH_FRAME_SIZE];
int frame_len = 0;
struct eth_llc_frame * llc_frame;
+ struct mgmt_frame * frame;
(void) o;
@@ -573,14 +591,17 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
if (ssap == MGMT_SAP && dsap == MGMT_SAP) {
pthread_mutex_lock(&eth_llc_data.mgmt_lock);
- memcpy(eth_llc_data.mgmt_buf,
- &llc_frame->payload,
- length);
- memcpy(eth_llc_data.mgmt_r_addr,
- llc_frame->src_hwaddr,
- MAC_SIZE);
- eth_llc_data.mgmt_len = length;
- eth_llc_data.mgmt_arrived = true;
+
+ frame = malloc(sizeof(*frame));
+ if (frame == NULL) {
+ pthread_mutex_unlock(&eth_llc_data.mgmt_lock);
+ continue;
+ }
+
+ memcpy(frame->buf, &llc_frame->payload, length);
+ memcpy(frame->r_addr, llc_frame->src_hwaddr, MAC_SIZE);
+ frame->len = length;
+ list_add(&frame->next, &eth_llc_data.mgmt_frames);
pthread_cond_signal(&eth_llc_data.mgmt_cond);
pthread_mutex_unlock(&eth_llc_data.mgmt_lock);
} else {