summaryrefslogtreecommitdiff
path: root/sysdep/linux/netlink.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdep/linux/netlink.c')
-rw-r--r--sysdep/linux/netlink.c190
1 files changed, 158 insertions, 32 deletions
diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c
index fdf3f2db..29b744cb 100644
--- a/sysdep/linux/netlink.c
+++ b/sysdep/linux/netlink.c
@@ -69,6 +69,10 @@
#define RTA_ENCAP 22
#endif
+#ifndef NETLINK_GET_STRICT_CHK
+#define NETLINK_GET_STRICT_CHK 12
+#endif
+
#define krt_ipv4(p) ((p)->af == AF_INET)
#define krt_ecmp6(p) ((p)->af == AF_INET6)
@@ -130,7 +134,7 @@ struct nl_sock
uint last_size;
};
-#define NL_RX_SIZE 8192
+#define NL_RX_SIZE 32768
#define NL_OP_DELETE 0
#define NL_OP_ADD (NLM_F_CREATE|NLM_F_EXCL)
@@ -158,10 +162,46 @@ nl_open_sock(struct nl_sock *nl)
}
static void
+nl_set_strict_dump(struct nl_sock *nl UNUSED, int strict UNUSED)
+{
+ /*
+ * Strict checking is not necessary, it improves behavior on newer kernels.
+ * If it is not available (missing SOL_NETLINK compile-time, or ENOPROTOOPT
+ * run-time), we can just ignore it.
+ */
+#ifdef SOL_NETLINK
+ setsockopt(nl->fd, SOL_NETLINK, NETLINK_GET_STRICT_CHK, &strict, sizeof(strict));
+#endif
+}
+
+static void
+nl_set_rcvbuf(int fd, uint val)
+{
+ if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &val, sizeof(val)) < 0)
+ log(L_WARN "KRT: Cannot set netlink rx buffer size to %u: %m", val);
+}
+
+static uint
+nl_cfg_rx_buffer_size(struct config *cfg)
+{
+ uint bufsize = 0;
+
+ struct proto_config *pc;
+ WALK_LIST(pc, cfg->protos)
+ if ((pc->protocol == &proto_unix_kernel) && !pc->disabled)
+ bufsize = MAX(bufsize, ((struct krt_config *) pc)->sys.netlink_rx_buffer);
+
+ return bufsize;
+}
+
+
+static void
nl_open(void)
{
nl_open_sock(&nl_scan);
nl_open_sock(&nl_req);
+
+ nl_set_strict_dump(&nl_scan, 1);
}
static void
@@ -180,20 +220,60 @@ nl_send(struct nl_sock *nl, struct nlmsghdr *nh)
}
static void
-nl_request_dump(int af, int cmd)
+nl_request_dump_link(void)
{
struct {
struct nlmsghdr nh;
- struct rtgenmsg g;
+ struct ifinfomsg ifi;
} req = {
- .nh.nlmsg_type = cmd,
- .nh.nlmsg_len = sizeof(req),
+ .nh.nlmsg_type = RTM_GETLINK,
+ .nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
- .g.rtgen_family = af
+ .nh.nlmsg_seq = ++(nl_scan.seq),
+ .ifi.ifi_family = AF_UNSPEC,
};
- nl_send(&nl_scan, &req.nh);
+
+ send(nl_scan.fd, &req, sizeof(req), 0);
+ nl_scan.last_hdr = NULL;
}
+static void
+nl_request_dump_addr(int af)
+{
+ struct {
+ struct nlmsghdr nh;
+ struct ifaddrmsg ifa;
+ } req = {
+ .nh.nlmsg_type = RTM_GETADDR,
+ .nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
+ .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
+ .nh.nlmsg_seq = ++(nl_scan.seq),
+ .ifa.ifa_family = af,
+ };
+
+ send(nl_scan.fd, &req, sizeof(req), 0);
+ nl_scan.last_hdr = NULL;
+}
+
+static void
+nl_request_dump_route(int af)
+{
+ struct {
+ struct nlmsghdr nh;
+ struct rtmsg rtm;
+ } req = {
+ .nh.nlmsg_type = RTM_GETROUTE,
+ .nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
+ .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
+ .nh.nlmsg_seq = ++(nl_scan.seq),
+ .rtm.rtm_family = af,
+ };
+
+ send(nl_scan.fd, &req, sizeof(req), 0);
+ nl_scan.last_hdr = NULL;
+}
+
+
static struct nlmsghdr *
nl_get_reply(struct nl_sock *nl)
{
@@ -681,7 +761,7 @@ nl_add_multipath(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af, e
}
static struct nexthop *
-nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr *ra, int af)
+nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, const net_addr *n, struct rtattr *ra, int af, int krt_src)
{
struct rtattr *a[BIRD_RTA_MAX];
struct rtnexthop *nh = RTA_DATA(ra);
@@ -695,9 +775,9 @@ nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr
{
/* Use RTNH_OK(nh,len) ?? */
if ((len < sizeof(*nh)) || (len < nh->rtnh_len))
- return NULL;
+ goto err;
- if (nh->rtnh_flags & RTNH_F_DEAD)
+ if ((nh->rtnh_flags & RTNH_F_DEAD) && (krt_src != KRT_SRC_BIRD))
goto next;
*last = rv = lp_allocz(s->pool, NEXTHOP_MAX_SIZE);
@@ -706,7 +786,10 @@ nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr
rv->weight = nh->rtnh_hops;
rv->iface = if_find_by_index(nh->rtnh_ifindex);
if (!rv->iface)
- return NULL;
+ {
+ log(L_ERR "KRT: Received route %N with unknown ifindex %u", n, nh->rtnh_ifindex);
+ return NULL;
+ }
/* Nonexistent RTNH_PAYLOAD ?? */
nl_attr_len = nh->rtnh_len - RTNH_LENGTH(0);
@@ -714,18 +797,18 @@ nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr
{
case AF_INET:
if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want4, a, sizeof(a)))
- return NULL;
+ goto err;
break;
case AF_INET6:
if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want6, a, sizeof(a)))
- return NULL;
+ goto err;
break;
#ifdef HAVE_MPLS_KERNEL
case AF_MPLS:
if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want_mpls, a, sizeof(a)))
- return NULL;
+ goto err;
if (a[RTA_NEWDST])
rv->labels = rta_get_mpls(a[RTA_NEWDST], rv->label);
@@ -734,7 +817,7 @@ nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr
#endif
default:
- return NULL;
+ goto err;
}
if (a[RTA_GATEWAY])
@@ -757,14 +840,19 @@ nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr
nbr = neigh_find(&p->p, rv->gw, rv->iface,
(rv->flags & RNF_ONLINK) ? NEF_ONLINK : 0);
if (!nbr || (nbr->scope == SCOPE_HOST))
- return NULL;
+ {
+ log(L_ERR "KRT: Received route %N with strange next-hop %I", n, rv->gw);
+ return NULL;
+ }
}
#ifdef HAVE_MPLS_KERNEL
if (a[RTA_ENCAP] && a[RTA_ENCAP_TYPE])
{
- if (rta_get_u16(a[RTA_ENCAP_TYPE]) != LWTUNNEL_ENCAP_MPLS) {
- log(L_WARN "KRT: Unknown encapsulation method %d in multipath", rta_get_u16(a[RTA_ENCAP_TYPE]));
+ if (rta_get_u16(a[RTA_ENCAP_TYPE]) != LWTUNNEL_ENCAP_MPLS)
+ {
+ log(L_WARN "KRT: Received route %N with unknown encapsulation method %d",
+ n, rta_get_u16(a[RTA_ENCAP_TYPE]));
return NULL;
}
@@ -785,6 +873,10 @@ nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr
first = nexthop_sort(first);
return first;
+
+err:
+ log(L_ERR "KRT: Received strange multipath route %N", n);
+ return NULL;
}
static void
@@ -1139,7 +1231,7 @@ kif_do_scan(struct kif_proto *p UNUSED)
if_start_update();
- nl_request_dump(AF_UNSPEC, RTM_GETLINK);
+ nl_request_dump_link();
while (h = nl_get_scan())
if (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)
nl_parse_link(h, 1);
@@ -1166,14 +1258,14 @@ kif_do_scan(struct kif_proto *p UNUSED)
}
}
- nl_request_dump(AF_INET, RTM_GETADDR);
+ nl_request_dump_addr(AF_INET);
while (h = nl_get_scan())
if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR)
nl_parse_addr(h, 1);
else
log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type);
- nl_request_dump(AF_INET6, RTM_GETADDR);
+ nl_request_dump_addr(AF_INET6);
while (h = nl_get_scan())
if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR)
nl_parse_addr(h, 1);
@@ -1523,7 +1615,8 @@ nl_parse_end(struct nl_parse_state *s)
}
-#define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0)
+#define SKIP0(ARG, ...) do { DBG("KRT: Ignoring route - " ARG, ##__VA_ARGS__); return; } while(0)
+#define SKIP(ARG, ...) do { DBG("KRT: Ignoring route %N - " ARG, &dst, ##__VA_ARGS__); return; } while(0)
static void
nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
@@ -1576,10 +1669,10 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
return;
if (!a[RTA_DST])
- SKIP("MPLS route without RTA_DST");
+ SKIP0("MPLS route without RTA_DST\n");
if (rta_get_mpls(a[RTA_DST], rta_mpls_stack) != 1)
- SKIP("MPLS route with multi-label RTA_DST");
+ SKIP0("MPLS route with multi-label RTA_DST\n");
net_fill_mpls(&dst, rta_mpls_stack[0]);
break;
@@ -1597,6 +1690,9 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
else
table_id = i->rtm_table;
+ if (i->rtm_flags & RTM_F_CLONED)
+ SKIP("cloned\n");
+
/* Do we know this table? */
p = HASH_FIND(nl_table_map, RTH, i->rtm_family, table_id);
if (!p)
@@ -1675,19 +1771,16 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
if (a[RTA_MULTIPATH])
{
- struct nexthop *nh = nl_parse_multipath(s, p, a[RTA_MULTIPATH], i->rtm_family);
+ struct nexthop *nh = nl_parse_multipath(s, p, n, a[RTA_MULTIPATH], i->rtm_family, krt_src);
if (!nh)
- {
- log(L_ERR "KRT: Received strange multipath route %N", net->n.addr);
- return;
- }
+ SKIP("strange RTA_MULTIPATH\n");
nexthop_link(ra, nh);
break;
}
- if (i->rtm_flags & RTNH_F_DEAD)
- return;
+ if ((i->rtm_flags & RTNH_F_DEAD) && (krt_src != KRT_SRC_BIRD))
+ SKIP("ignore RTNH_F_DEAD\n");
ra->nh.iface = if_find_by_index(oif);
if (!ra->nh.iface)
@@ -1889,7 +1982,7 @@ krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NUL
struct nl_parse_state s;
nl_parse_begin(&s, 1);
- nl_request_dump(AF_UNSPEC, RTM_GETROUTE);
+ nl_request_dump_route(AF_UNSPEC);
while (h = nl_get_scan())
if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
nl_parse_route(&s, h);
@@ -1904,6 +1997,8 @@ krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NUL
static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */
static byte *nl_async_rx_buffer; /* Receive buffer */
+static uint nl_async_bufsize; /* Kernel rx buffer size for the netlink socket */
+static struct config *nl_last_config; /* For tracking changes to nl_async_bufsize */
static void
nl_async_msg(struct nlmsghdr *h)
@@ -2039,6 +2134,32 @@ nl_open_async(void)
bug("Netlink: sk_open failed");
}
+static void
+nl_update_async_bufsize(void)
+{
+ /* No async socket */
+ if (!nl_async_sk)
+ return;
+
+ /* Already reconfigured */
+ if (nl_last_config == config)
+ return;
+
+ /* Update netlink buffer size */
+ uint bufsize = nl_cfg_rx_buffer_size(config);
+ if (bufsize && (bufsize != nl_async_bufsize))
+ {
+ /* Log message for reconfigurations only */
+ if (nl_last_config)
+ log(L_INFO "KRT: Changing netlink rx buffer size to %u", bufsize);
+
+ nl_set_rcvbuf(nl_async_sk->fd, bufsize);
+ nl_async_bufsize = bufsize;
+ }
+
+ nl_last_config = config;
+}
+
/*
* Interface to the UNIX krt module
@@ -2067,6 +2188,7 @@ krt_sys_start(struct krt_proto *p)
nl_open();
nl_open_async();
+ nl_update_async_bufsize();
return 1;
}
@@ -2074,12 +2196,16 @@ krt_sys_start(struct krt_proto *p)
void
krt_sys_shutdown(struct krt_proto *p)
{
+ nl_update_async_bufsize();
+
HASH_REMOVE2(nl_table_map, RTH, krt_pool, p);
}
int
krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o)
{
+ nl_update_async_bufsize();
+
return (n->sys.table_id == o->sys.table_id) && (n->sys.metric == o->sys.metric);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 02:33:12 +0000