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netmgr: add isc_nm_routeconnect()

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isc_nm_routeconnect() opens a route/netlink socket, then calls a
connect callback, much like isc_nm_udpconnect(), with a handle that
can then be monitored for network changes.

Internally the socket is treated as a UDP socket, since route/netlink
sockets follow the datagram contract.
This commit is contained in:
Evan Hunt
2021-10-02 14:52:46 -07:00
parent a9e35ea936
commit 8c51a32e5c
4 changed files with 270 additions and 8 deletions
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24
lib/isc/netmgr/netmgr.c
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@@ -913,6 +913,8 @@ process_netievent(isc__networker_t *worker, isc__netievent_t *ievent) {
NETIEVENT_CASE(udpcancel);
NETIEVENT_CASE(udpclose);
NETIEVENT_CASE(routeconnect);
NETIEVENT_CASE(tcpaccept);
NETIEVENT_CASE(tcpconnect);
NETIEVENT_CASE(tcplisten);
@@ -1072,6 +1074,7 @@ NETIEVENT_SOCKET_REQ_DEF(tcpconnect);
NETIEVENT_SOCKET_REQ_DEF(tcpsend);
NETIEVENT_SOCKET_REQ_DEF(tlssend);
NETIEVENT_SOCKET_REQ_DEF(udpconnect);
NETIEVENT_SOCKET_REQ_DEF(routeconnect);
NETIEVENT_SOCKET_REQ_RESULT_DEF(connectcb);
NETIEVENT_SOCKET_REQ_RESULT_DEF(readcb);
NETIEVENT_SOCKET_REQ_RESULT_DEF(sendcb);
@@ -1447,12 +1450,8 @@ isc___nmsocket_init(isc_nmsocket_t *sock, isc_nm_t *mgr, isc_nmsocket_type type,
REQUIRE(sock != NULL);
REQUIRE(mgr != NULL);
REQUIRE(iface != NULL);
family = iface->type.sa.sa_family;
*sock = (isc_nmsocket_t){ .type = type,
.iface = *iface,
.fd = -1,
.ah_size = 32,
.inactivehandles = isc_astack_new(
@@ -1460,6 +1459,13 @@ isc___nmsocket_init(isc_nmsocket_t *sock, isc_nm_t *mgr, isc_nmsocket_type type,
.inactivereqs = isc_astack_new(
mgr->mctx, ISC_NM_REQS_STACK_SIZE) };
if (iface != NULL) {
family = iface->type.sa.sa_family;
sock->iface = *iface;
} else {
family = AF_UNSPEC;
}
#if NETMGR_TRACE
sock->backtrace_size = isc_backtrace(sock->backtrace, TRACE_SIZE);
ISC_LINK_INIT(sock, active_link);
@@ -1492,6 +1498,12 @@ isc___nmsocket_init(isc_nmsocket_t *sock, isc_nm_t *mgr, isc_nmsocket_type type,
case AF_INET6:
sock->statsindex = udp6statsindex;
break;
case AF_UNSPEC:
/*
* Route sockets are AF_UNSPEC, and don't
* have stats counters.
*/
break;
default:
INSIST(0);
ISC_UNREACHABLE();
@@ -1521,6 +1533,10 @@ isc___nmsocket_init(isc_nmsocket_t *sock, isc_nm_t *mgr, isc_nmsocket_type type,
break;
}
if (sock->statsindex != NULL) {
isc__nm_incstats(sock->mgr, sock->statsindex[STATID_ACTIVE]);
}
isc_mutex_init(&sock->lock);
isc_condition_init(&sock->cond);
isc_condition_init(&sock->scond);