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authorRaimo Niskanen <[email protected]>2013-07-16 15:14:50 +0200
committerRaimo Niskanen <[email protected]>2013-07-17 10:20:18 +0200
commit08ff3673e25fdd184ff92d45d4609cd423fd1e34 (patch)
tree75fa93a4ecb3431d33e74e39594f878c18cb077d /erts/emulator/drivers/common
parenta9f92f3d024feffe23303af141dc4b13c7c17aa5 (diff)
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Implement netns for SCTP + bugfixes
Diffstat (limited to 'erts/emulator/drivers/common')
-rw-r--r--erts/emulator/drivers/common/inet_drv.c67
1 files changed, 61 insertions, 6 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 9ef2a1cfc0..60db50e80a 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -1194,6 +1194,7 @@ static ErlDrvTermData am_dontroute;
static ErlDrvTermData am_priority;
static ErlDrvTermData am_tos;
static ErlDrvTermData am_ipv6_v6only;
+static ErlDrvTermData am_netns;
#endif
/* speical errors for bad ports and sequences */
@@ -3511,6 +3512,7 @@ static void inet_init_sctp(void) {
INIT_ATOM(priority);
INIT_ATOM(tos);
INIT_ATOM(ipv6_v6only);
+ INIT_ATOM(netns);
/* Option names */
INIT_ATOM(sctp_rtoinfo);
@@ -3921,14 +3923,21 @@ static int erl_inet_close(inet_descriptor* desc)
static ErlDrvSSizeT inet_ctl_open(inet_descriptor* desc, int domain, int type,
char** rbuf, ErlDrvSizeT rsize)
{
+ int save_errno;
#ifdef HAVE_SETNS
- int current_ns, new_ns, save_errno;
- current_ns = new_ns = save_errno = 0;
+ int current_ns, new_ns;
+ current_ns = new_ns = 0;
#endif
+ save_errno = 0;
+
if (desc->state != INET_STATE_CLOSED)
return ctl_xerror(EXBADSEQ, rbuf, rsize);
+
#ifdef HAVE_SETNS
if (desc->netns != NULL) {
+ /* Temporarily change network namespace for this thread
+ * while creating the socket
+ */
current_ns = open("/proc/self/ns/net", O_RDONLY);
if (current_ns == INVALID_SOCKET)
return ctl_error(sock_errno(), rbuf, rsize);
@@ -3954,11 +3963,18 @@ static ErlDrvSSizeT inet_ctl_open(inet_descriptor* desc, int domain, int type,
}
#endif
if ((desc->s = sock_open(domain, type, desc->sprotocol)) == INVALID_SOCKET)
- return ctl_error(sock_errno(), rbuf, rsize);
+ save_errno = sock_errno();
#ifdef HAVE_SETNS
if (desc->netns != NULL) {
+ /* Restore network namespace */
if (setns(current_ns, CLONE_NEWNET) != 0) {
- save_errno = sock_errno();
+ /* XXX Failed to restore network namespace.
+ * What to do? Tidy up and return an error...
+ * Note that the thread now might still be in the namespace.
+ * Can this even happen? Should the emulator be aborted?
+ */
+ if (desc->s != INVALID_SOCKET)
+ save_errno = sock_errno();
while (close(desc->s) == INVALID_SOCKET &&
sock_errno() == EINTR);
desc->s = INVALID_SOCKET;
@@ -3972,8 +3988,16 @@ static ErlDrvSSizeT inet_ctl_open(inet_descriptor* desc, int domain, int type,
}
}
#endif
- if ((desc->event = sock_create_event(desc)) == INVALID_EVENT)
- return ctl_error(sock_errno(), rbuf, rsize);
+ if (desc->s == INVALID_SOCKET)
+ return ctl_error(save_errno, rbuf, rsize);
+
+ if ((desc->event = sock_create_event(desc)) == INVALID_EVENT) {
+ save_errno = sock_errno();
+ while (close(desc->s) == INVALID_SOCKET &&
+ sock_errno() == EINTR);
+ desc->s = INVALID_SOCKET;
+ return ctl_error(save_errno, rbuf, rsize);
+ }
SET_NONBLOCKING(desc->s);
#ifdef __WIN32__
driver_select(desc->port, desc->event, ERL_DRV_READ, 1);
@@ -5932,6 +5956,21 @@ static int sctp_set_opts(inet_descriptor* desc, char* ptr, int len)
res = 0;
continue;
+#ifdef HAVE_SETNS
+ case INET_LOPT_NETNS:
+ {
+ size_t ns_len;
+ ns_len = get_int32(curr); curr += 4;
+ CHKLEN(curr, ns_len);
+ if (desc->netns != NULL) FREE(desc->netns);
+ desc->netns = ALLOC(ns_len + 1);
+ memcpy(desc->netns, curr, ns_len);
+ desc->netns[ns_len] = '\0';
+ curr += ns_len;
+ }
+ continue;
+#endif
+
/* SCTP options and applicable generic INET options: */
case SCTP_OPT_RTOINFO:
@@ -6827,6 +6866,22 @@ static ErlDrvSSizeT sctp_fill_opts(inet_descriptor* desc,
break;
}
+#ifdef HAVE_SETNS
+ case INET_LOPT_NETNS:
+ if (desc->netns != NULL) {
+ PLACE_FOR
+ (spec, i,
+ LOAD_ATOM_CNT + LOAD_BUF2BINARY_CNT + LOAD_TUPLE_CNT);
+ i = LOAD_ATOM (spec, i, am_netns);
+ i = LOAD_BUF2BINARY
+ (spec, i, desc->netns, strlen(desc->netns));
+ i = LOAD_TUPLE (spec, i, 2);
+ break;
+ }
+ else
+ continue; /* Ignore */
+#endif
+
/* SCTP and generic INET options: */
case SCTP_OPT_RTOINFO: