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authorDimitri Staessens <dimitri@ouroboros.rocks>2023-08-28 12:29:00 +0200
committerSander Vrijders <sander@ouroboros.rocks>2023-08-30 10:33:20 +0200
commit08332eefba9aa4b08d00e190720de4771081e855 (patch)
tree9e6b4dbf920b3813c696f79c6f2b926f976402b8 /src/ipcpd/eth/eth.c
parent870e3fdfaee4991592cc29e90767abd0e9fba43b (diff)
downloadouroboros-08332eefba9aa4b08d00e190720de4771081e855.tar.gz
ouroboros-08332eefba9aa4b08d00e190720de4771081e855.zip
ipcpd: Move alloc race mitigation to common source
All flow allocator code was duplicating the mitigation for a race where the IRMd response for the flow allocation with a new flow fd was arriving before the response to the flow_req_arr. This is now moved to the ipcp common source. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
Diffstat (limited to 'src/ipcpd/eth/eth.c')
-rw-r--r--src/ipcpd/eth/eth.c54
1 files changed, 3 insertions, 51 deletions
diff --git a/src/ipcpd/eth/eth.c b/src/ipcpd/eth/eth.c
index 12bd294e..ef64c07e 100644
--- a/src/ipcpd/eth/eth.c
+++ b/src/ipcpd/eth/eth.c
@@ -136,7 +136,6 @@
#define ETH_FRAME_SIZE (ETH_HEADER_SIZE + ETH_MTU_MAX)
#endif
-#define ALLOC_TIMEO 10 /* ms */
#define NAME_QUERY_TIMEO 2000 /* ms */
#define MGMT_TIMEO 100 /* ms */
#define MGMT_FRAME_SIZE 2048
@@ -575,32 +574,10 @@ static int eth_ipcp_req(uint8_t * r_addr,
const void * data,
size_t len)
{
- struct timespec ts = {0, ALLOC_TIMEO * MILLION};
- struct timespec abstime;
- int fd;
- time_t mpl = IPCP_ETH_MPL;
+ int fd;
- clock_gettime(PTHREAD_COND_CLOCK, &abstime);
-
- pthread_mutex_lock(&ipcpi.alloc_lock);
-
- while (ipcpi.alloc_id != -1 && ipcp_get_state() == IPCP_OPERATIONAL) {
- ts_add(&abstime, &ts, &abstime);
- pthread_cond_timedwait(&ipcpi.alloc_cond,
- &ipcpi.alloc_lock,
- &abstime);
- }
-
- if (ipcp_get_state() != IPCP_OPERATIONAL) {
- log_dbg("Won't allocate over non-operational IPCP.");
- pthread_mutex_unlock(&ipcpi.alloc_lock);
- return -1;
- }
-
- /* reply to IRM, called under lock to prevent race */
- fd = ipcp_flow_req_arr(dst, ipcp_dir_hash_len(), qs, mpl, data, len);
+ fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_ETH_MPL, data, len);
if (fd < 0) {
- pthread_mutex_unlock(&ipcpi.alloc_lock);
log_err("Could not get new flow from IRMd.");
return -1;
}
@@ -615,11 +592,6 @@ static int eth_ipcp_req(uint8_t * r_addr,
pthread_rwlock_unlock(&eth_data.flows_lock);
- ipcpi.alloc_id = fd;
- pthread_cond_broadcast(&ipcpi.alloc_cond);
-
- pthread_mutex_unlock(&ipcpi.alloc_lock);
-
#if defined(BUILD_ETH_DIX)
log_dbg("New flow request, fd %d, remote endpoint %d.", fd, r_eid);
#elif defined(BUILD_ETH_LLC)
@@ -1704,8 +1676,6 @@ static int eth_ipcp_flow_alloc_resp(int fd,
const void * data,
size_t len)
{
- struct timespec ts = {0, ALLOC_TIMEO * MILLION};
- struct timespec abstime;
#if defined(BUILD_ETH_DIX)
uint16_t r_eid;
#elif defined(BUILD_ETH_LLC)
@@ -1714,26 +1684,8 @@ static int eth_ipcp_flow_alloc_resp(int fd,
#endif
uint8_t r_addr[MAC_SIZE];
- clock_gettime(PTHREAD_COND_CLOCK, &abstime);
-
- pthread_mutex_lock(&ipcpi.alloc_lock);
-
- while (ipcpi.alloc_id != fd && ipcp_get_state() == IPCP_OPERATIONAL) {
- ts_add(&abstime, &ts, &abstime);
- pthread_cond_timedwait(&ipcpi.alloc_cond,
- &ipcpi.alloc_lock,
- &abstime);
- }
-
- if (ipcp_get_state() != IPCP_OPERATIONAL) {
- pthread_mutex_unlock(&ipcpi.alloc_lock);
+ if (ipcp_wait_flow_resp(fd) < 0)
return -1;
- }
-
- ipcpi.alloc_id = -1;
- pthread_cond_broadcast(&ipcpi.alloc_cond);
-
- pthread_mutex_unlock(&ipcpi.alloc_lock);
pthread_rwlock_wrlock(&eth_data.flows_lock);
#if defined(BUILD_ETH_DIX)