Handle netlink ENOBUFS events

diff --git a/src/ndp.c b/src/ndp.c
index 7f63f96099c1b34c8cc22459074e4156ad4f3d8b..95eb18fce5a57e78474352435f9b03e6646e75d9 100644 (file)
--- a/src/ndp.c
+++ b/src/ndp.c
@@ -38,10 +38,11 @@ static void handle_solicit(void *addr, void *data, size_t len,
                struct interface *iface, void *dest);
 static void handle_rtnetlink(void *addr, void *data, size_t len,
                struct interface *iface, void *dest);
+static void catch_rtnetlink(int error);
 
 static uint32_t rtnl_seqid = 0;
 static int ping_socket = -1;
-static struct odhcpd_event rtnl_event = {{.fd = -1}, handle_rtnetlink};
+static struct odhcpd_event rtnl_event = {{.fd = -1}, handle_rtnetlink, catch_rtnetlink};
 
 
 // Filter ICMPv6 messages of type neighbor soliciation
@@ -60,10 +61,15 @@ static const struct sock_fprog bpf_prog = {sizeof(bpf) / sizeof(*bpf), bpf};
 // Initialize NDP-proxy
 int init_ndp(void)
 {
+       int val = 256 * 1024;
+
        // Setup netlink socket
        if ((rtnl_event.uloop.fd = odhcpd_open_rtnl()) < 0)
                return -1;
 
+       if (setsockopt(rtnl_event.uloop.fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)))
+               setsockopt(rtnl_event.uloop.fd, SOL_SOCKET, SO_RCVBUFFORCE, &val, sizeof(val));
+
        // Receive netlink neighbor and ip-address events
        uint32_t group = RTNLGRP_IPV6_IFADDR;
        setsockopt(rtnl_event.uloop.fd, SOL_NETLINK,
@@ -81,7 +87,7 @@ int init_ndp(void)
                        return -1;
        }
 
-       int val = 2;
+       val = 2;
        setsockopt(ping_socket, IPPROTO_RAW, IPV6_CHECKSUM, &val, sizeof(val));
 
        // This is required by RFC 4861
@@ -491,3 +497,18 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len,
        if (dump_neigh)
                dump_neigh_table(false);
 }
+
+static void catch_rtnetlink(int error)
+{
+       if (error == ENOBUFS) {
+               struct {
+                       struct nlmsghdr nh;
+                       struct ifaddrmsg ifa;
+               } req2 = {
+                       {sizeof(req2), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
+                                       ++rtnl_seqid, 0},
+                       {.ifa_family = AF_INET6}
+               };
+               send(rtnl_event.uloop.fd, &req2, sizeof(req2), MSG_DONTWAIT);
+       }
+}

diff --git a/src/odhcpd.c b/src/odhcpd.c
index 9c7f27c4f4ac43b206e8030a05fae44ddba27e2b..0c9542c98c279a4d292d84083c58f20827d0044e 100644 (file)
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -367,6 +367,16 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even
                struct sockaddr_nl nl;
        } addr;
 
+       if (u->error) {
+               int ret = -1;
+               socklen_t ret_len = sizeof(ret);
+               getsockopt(u->fd, SOL_SOCKET, SO_ERROR, &ret, &ret_len);
+               u->error = false;
+               if (e->handle_error)
+                       e->handle_error(ret);
+               return;
+       }
+
        while (true) {
                struct iovec iov = {data_buf, sizeof(data_buf)};
                struct msghdr msg = {
@@ -446,7 +456,8 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even
 int odhcpd_register(struct odhcpd_event *event)
 {
        event->uloop.cb = odhcpd_receive_packets;
-       return uloop_fd_add(&event->uloop, ULOOP_READ);
+       return uloop_fd_add(&event->uloop, ULOOP_READ |
+                       ((event->handle_error) ? ULOOP_ERROR_CB : 0));
 }
 
 void odhcpd_process(struct odhcpd_event *event)

diff --git a/src/odhcpd.h b/src/odhcpd.h
index 81f4bee774f3cdf5e6ade2264fe11ec79660032c..fd43dfe3ba206762beaa7e48a7dd3e279cf578da 100644 (file)
--- a/src/odhcpd.h
+++ b/src/odhcpd.h
@@ -62,6 +62,7 @@ struct odhcpd_event {
        struct uloop_fd uloop;
        void (*handle_dgram)(void *addr, void *data, size_t len,
                        struct interface *iface, void *dest_addr);
+       void (*handle_error)(int error);
 };
 
 

diff --git a/src/router.c b/src/router.c
index 74d8a09d8fe44fde93f145133bfaac50f95600a2..990782426967271a985eec10e558d95d76cb57b4 100644 (file)
--- a/src/router.c
+++ b/src/router.c
@@ -34,7 +34,7 @@ static void handle_icmpv6(void *addr, void *data, size_t len,
 static void trigger_router_advert(struct uloop_timeout *event);
 static void sigusr1_refresh(int signal);
 
-static struct odhcpd_event router_event = {{.fd = -1}, handle_icmpv6};
+static struct odhcpd_event router_event = {{.fd = -1}, handle_icmpv6, NULL};
 
 static FILE *fp_route = NULL;
 #define RA_IOV_LEN 6