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authorPatrik Nyblom <[email protected]>2011-01-27 12:11:23 +0100
committerPatrik Nyblom <[email protected]>2011-02-21 15:13:02 +0100
commit3c10f18499b9b3f713ac48ca5973869778cf4df9 (patch)
tree673c3a7441c0ff05798a89e169ec52992b49c088 /erts/emulator/drivers/common
parentc478e3fda9b244fe49da78e6a64021b40a792688 (diff)
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Add patch from Per Hedeland
Per H @ Tail-f: The original code here had problems that possibly only occur if you abuse it for non-INET sockets, but anyway: a) If the getsockopt for SO_PRIORITY or IP_TOS failed, the actual requested setsockopt was never even attempted. b) If {get,set}sockopt for one of IP_TOS and SO_PRIORITY failed, but ditto for the other worked and that was actually the requested option, failure was still reported to erlang.
Diffstat (limited to 'erts/emulator/drivers/common')
-rw-r--r--erts/emulator/drivers/common/inet_drv.c42
1 files changed, 28 insertions, 14 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 49da0ef118..b491242aea 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -5050,9 +5050,17 @@ static STATUS wrap_sockopt(STATUS (*function)() /* Yep, no parameter
}
#endif
+/* Per H @ Tail-f: The original code here had problems that possibly
+ only occur if you abuse it for non-INET sockets, but anyway:
+ a) If the getsockopt for SO_PRIORITY or IP_TOS failed, the actual
+ requested setsockopt was never even attempted.
+ b) If {get,set}sockopt for one of IP_TOS and SO_PRIORITY failed,
+ but ditto for the other worked and that was actually the requested
+ option, failure was still reported to erlang. */
+
#if defined(IP_TOS) && defined(SOL_IP) && defined(SO_PRIORITY)
static int setopt_prio_tos_trick
- (int fd, int proto, int type, char* arg_ptr, int arg_sz)
+ (int fd, int proto, int type, char* arg_ptr, int arg_sz, int propagate)
{
/* The relations between SO_PRIORITY, TOS and other options
is not what you (or at least I) would expect...:
@@ -5065,6 +5073,8 @@ static int setopt_prio_tos_trick
int tmp_ival_prio;
int tmp_ival_tos;
int res;
+ int res_prio;
+ int res_tos;
#ifdef HAVE_SOCKLEN_T
socklen_t
#else
@@ -5073,31 +5083,35 @@ static int setopt_prio_tos_trick
tmp_arg_sz_prio = sizeof(tmp_ival_prio),
tmp_arg_sz_tos = sizeof(tmp_ival_tos);
- res = sock_getopt(fd, SOL_SOCKET, SO_PRIORITY,
+ res_prio = sock_getopt(fd, SOL_SOCKET, SO_PRIORITY,
(char *) &tmp_ival_prio, &tmp_arg_sz_prio);
- if (res == 0) {
- res = sock_getopt(fd, SOL_IP, IP_TOS,
+ res_tos = sock_getopt(fd, SOL_IP, IP_TOS,
(char *) &tmp_ival_tos, &tmp_arg_sz_tos);
- if (res == 0) {
res = sock_setopt(fd, proto, type, arg_ptr, arg_sz);
if (res == 0) {
if (type != SO_PRIORITY) {
- if (type != IP_TOS) {
- res = sock_setopt(fd,
+ if (type != IP_TOS && res_tos == 0) {
+ res_tos = sock_setopt(fd,
SOL_IP,
IP_TOS,
(char *) &tmp_ival_tos,
tmp_arg_sz_tos);
+ if (propagate)
+ res = res_tos;
}
- if (res == 0) {
- res = sock_setopt(fd,
+ if (res == 0 && res_prio == 0) {
+ res_prio = sock_setopt(fd,
SOL_SOCKET,
SO_PRIORITY,
(char *) &tmp_ival_prio,
tmp_arg_sz_prio);
- if (res != 0 && sock_errno() == EPERM) {
- res = 0;
- }
+ if (propagate) {
+ /* Some kernels set a SO_PRIORITY by default that you are not permitted to reset,
+ silently ignore this error condition */
+ if (res_prio != 0 && sock_errno() == EPERM) {
+ res = 0;
+ } else {
+ res = res_prio;
}
}
}
@@ -5443,7 +5457,7 @@ static int inet_set_opts(inet_descriptor* desc, char* ptr, int len)
return -1;
}
#if defined(IP_TOS) && defined(SOL_IP) && defined(SO_PRIORITY)
- res = setopt_prio_tos_trick (desc->s, proto, type, arg_ptr, arg_sz);
+ res = setopt_prio_tos_trick (desc->s, proto, type, arg_ptr, arg_sz, propagate);
#else
res = sock_setopt (desc->s, proto, type, arg_ptr, arg_sz);
#endif
@@ -5973,7 +5987,7 @@ static int sctp_set_opts(inet_descriptor* desc, char* ptr, int len)
return -1;
}
#if defined(IP_TOS) && defined(SOL_IP) && defined(SO_PRIORITY)
- res = setopt_prio_tos_trick (desc->s, proto, type, arg_ptr, arg_sz);
+ res = setopt_prio_tos_trick (desc->s, proto, type, arg_ptr, arg_sz, 1);
#else
res = sock_setopt (desc->s, proto, type, arg_ptr, arg_sz);
#endif