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-rw-r--r--sysdep/linux/krt-sys.h1
-rw-r--r--sysdep/linux/netlink.Y4
-rw-r--r--sysdep/linux/netlink.c190
-rw-r--r--sysdep/linux/netlink.c.orig2179
-rw-r--r--sysdep/linux/sysio.h19
5 files changed, 2360 insertions, 33 deletions
diff --git a/sysdep/linux/krt-sys.h b/sysdep/linux/krt-sys.h
index a8af4c95..8897f889 100644
--- a/sysdep/linux/krt-sys.h
+++ b/sysdep/linux/krt-sys.h
@@ -69,6 +69,7 @@ static inline struct ifa * kif_get_primary_ip(struct iface *i UNUSED) { return N
struct krt_params {
u32 table_id; /* Kernel table ID we sync with */
u32 metric; /* Kernel metric used for all routes */
+ uint netlink_rx_buffer; /* Rx buffer size for the netlink socket */
};
struct krt_state {
diff --git a/sysdep/linux/netlink.Y b/sysdep/linux/netlink.Y
index 7097f577..487ad1d8 100644
--- a/sysdep/linux/netlink.Y
+++ b/sysdep/linux/netlink.Y
@@ -10,7 +10,8 @@ CF_HDR
CF_DECLS
-CF_KEYWORDS(KERNEL, TABLE, METRIC, KRT_PREFSRC, KRT_REALM, KRT_SCOPE, KRT_MTU, KRT_WINDOW,
+CF_KEYWORDS(KERNEL, TABLE, METRIC, NETLINK, RX, BUFFER,
+ KRT_PREFSRC, KRT_REALM, KRT_SCOPE, KRT_MTU, KRT_WINDOW,
KRT_RTT, KRT_RTTVAR, KRT_SSTRESH, KRT_CWND, KRT_ADVMSS, KRT_REORDERING,
KRT_HOPLIMIT, KRT_INITCWND, KRT_RTO_MIN, KRT_INITRWND, KRT_QUICKACK,
KRT_LOCK_MTU, KRT_LOCK_WINDOW, KRT_LOCK_RTT, KRT_LOCK_RTTVAR,
@@ -24,6 +25,7 @@ kern_proto: kern_proto kern_sys_item ';' ;
kern_sys_item:
KERNEL TABLE expr { THIS_KRT->sys.table_id = $3; }
| METRIC expr { THIS_KRT->sys.metric = $2; }
+ | NETLINK RX BUFFER expr { THIS_KRT->sys.netlink_rx_buffer = $4; }
;
dynamic_attr: KRT_PREFSRC { $$ = f_new_dynamic_attr(EAF_TYPE_IP_ADDRESS, T_IP, EA_KRT_PREFSRC); } ;
diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c
index 4ecd8878..e103c8ef 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);
@@ -1531,7 +1623,8 @@ 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)
@@ -1584,10 +1677,10 @@ 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;
@@ -1605,6 +1698,9 @@ 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)
@@ -1682,19 +1778,16 @@ 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)
@@ -1896,7 +1989,7 @@ 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);
@@ -1911,6 +2004,8 @@ 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)
@@ -2046,6 +2141,32 @@ 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
@@ -2074,6 +2195,7 @@ krt_sys_start(struct krt_proto *p)
nl_open();
nl_open_async();
+ nl_update_async_bufsize();
return 1;
}
@@ -2081,12 +2203,16 @@ 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);
}
diff --git a/sysdep/linux/netlink.c.orig b/sysdep/linux/netlink.c.orig
new file mode 100644
index 00000000..7cea5322
--- /dev/null
+++ b/sysdep/linux/netlink.c.orig
@@ -0,0 +1,2179 @@
+/*
+ * BIRD -- Linux Netlink Interface
+ *
+ * (c) 1999--2000 Martin Mares <mj@ucw.cz>
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <alloca.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <errno.h>
+
+#undef LOCAL_DEBUG
+
+#include "nest/bird.h"
+#include "nest/route.h"
+#include "nest/protocol.h"
+#include "nest/iface.h"
+#include "lib/alloca.h"
+#include "sysdep/unix/unix.h"
+#include "sysdep/unix/krt.h"
+#include "lib/socket.h"
+#include "lib/string.h"
+#include "lib/hash.h"
+#include "conf/conf.h"
+
+#include <asm/types.h>
+#include <linux/if.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#ifdef HAVE_MPLS_KERNEL
+#include <linux/lwtunnel.h>
+#endif
+
+#ifndef MSG_TRUNC /* Hack: Several versions of glibc miss this one :( */
+#define MSG_TRUNC 0x20
+#endif
+
+#ifndef IFA_FLAGS
+#define IFA_FLAGS 8
+#endif
+
+#ifndef IFF_LOWER_UP
+#define IFF_LOWER_UP 0x10000
+#endif
+
+#ifndef RTA_TABLE
+#define RTA_TABLE 15
+#endif
+
+#ifndef RTA_VIA
+#define RTA_VIA 18
+#endif
+
+#ifndef RTA_NEWDST
+#define RTA_NEWDST 19
+#endif
+
+#ifndef RTA_ENCAP_TYPE
+#define RTA_ENCAP_TYPE 21
+#endif
+
+#ifndef RTA_ENCAP
+#define RTA_ENCAP 22
+#endif
+
+#define krt_ipv4(p) ((p)->af == AF_INET)
+#define krt_ecmp6(p) ((p)->af == AF_INET6)
+
+const int rt_default_ecmp = 16;
+
+/*
+ * Structure nl_parse_state keeps state of received route processing. Ideally,
+ * we could just independently parse received Netlink messages and immediately
+ * propagate received routes to the rest of BIRD, but older Linux kernel (before
+ * version 4.11) represents and announces IPv6 ECMP routes not as one route with
+ * multiple next hops (like RTA_MULTIPATH in IPv4 ECMP), but as a sequence of
+ * routes with the same prefix. More recent kernels work as with IPv4.
+ *
+ * Therefore, BIRD keeps currently processed route in nl_parse_state structure
+ * and postpones its propagation until we expect it to be final; i.e., when
+ * non-matching route is received or when the scan ends. When another matching
+ * route is received, it is merged with the already processed route to form an
+ * ECMP route. Note that merging is done only for IPv6 (merge == 1), but the
+ * postponing is done in both cases (for simplicity). All IPv4 routes or IPv6
+ * routes with RTA_MULTIPATH set are just considered non-matching.
+ *
+ * This is ignored for asynchronous notifications (every notification is handled
+ * as a separate route). It is not an issue for our routes, as we ignore such
+ * notifications anyways. But importing alien IPv6 ECMP routes does not work
+ * properly with older kernels.
+ *
+ * Whatever the kernel version is, IPv6 ECMP routes are sent as multiple routes
+ * for the same prefix.
+ */
+
+struct nl_parse_state
+{
+ struct linpool *pool;
+ int scan;
+ int merge;
+
+ net *net;
+ rta *attrs;
+ struct krt_proto *proto;
+ s8 new;
+ s8 krt_src;
+ u8 krt_type;
+ u8 krt_proto;
+ u32 krt_metric;
+
+ u32 rta_flow; /* Used during parsing */
+};
+
+/*
+ * Synchronous Netlink interface
+ */
+
+struct nl_sock
+{
+ int fd;
+ u32 seq;
+ byte *rx_buffer; /* Receive buffer */
+ struct nlmsghdr *last_hdr; /* Recently received packet */
+ uint last_size;
+};
+
+#define NL_RX_SIZE 8192
+
+#define NL_OP_DELETE 0
+#define NL_OP_ADD (NLM_F_CREATE|NLM_F_EXCL)
+#define NL_OP_REPLACE (NLM_F_CREATE|NLM_F_REPLACE)
+#define NL_OP_APPEND (NLM_F_CREATE|NLM_F_APPEND)
+
+static linpool *nl_linpool;
+
+static struct nl_sock nl_scan = {.fd = -1}; /* Netlink socket for synchronous scan */
+static struct nl_sock nl_req = {.fd = -1}; /* Netlink socket for requests */
+
+static void
+nl_open_sock(struct nl_sock *nl)
+{
+ if (nl->fd < 0)
+ {
+ nl->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (nl->fd < 0)
+ die("Unable to open rtnetlink socket: %m");
+ nl->seq = (u32) (current_time() TO_S); /* Or perhaps random_u32() ? */
+ nl->rx_buffer = xmalloc(NL_RX_SIZE);
+ nl->last_hdr = NULL;
+ nl->last_size = 0;
+ }
+}
+
+static void
+nl_open(void)
+{
+ nl_open_sock(&nl_scan);
+ nl_open_sock(&nl_req);
+}
+
+static void
+nl_send(struct nl_sock *nl, struct nlmsghdr *nh)
+{
+ struct sockaddr_nl sa;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.nl_family = AF_NETLINK;
+ nh->nlmsg_pid = 0;
+ nh->nlmsg_seq = ++(nl->seq);
+ nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len);
+ if (sendto(nl->fd, nh, nh->nlmsg_len, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0)
+ die("rtnetlink sendto: %m");
+ nl->last_hdr = NULL;
+}
+
+static void
+nl_request_dump(int af, int cmd)
+{
+ struct {
+ struct nlmsghdr nh;
+ struct rtgenmsg g;
+ } req = {
+ .nh.nlmsg_type = cmd,
+ .nh.nlmsg_len = sizeof(req),
+ .nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
+ .g.rtgen_family = af
+ };
+ nl_send(&nl_scan, &req.nh);
+}
+
+static struct nlmsghdr *
+nl_get_reply(struct nl_sock *nl)
+{
+ for(;;)
+ {
+ if (!nl->last_hdr)
+ {
+ struct iovec iov = { nl->rx_buffer, NL_RX_SIZE };
+ struct sockaddr_nl sa;
+ struct msghdr m = {
+ .msg_name = &sa,
+ .msg_namelen = sizeof(sa),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ };
+ int x = recvmsg(nl->fd, &m, 0);
+ if (x < 0)
+ die("nl_get_reply: %m");
+ if (sa.nl_pid) /* It isn't from the kernel */
+ {
+ DBG("Non-kernel packet\n");
+ continue;
+ }
+ nl->last_size = x;
+ nl->last_hdr = (void *) nl->rx_buffer;
+ if (m.msg_flags & MSG_TRUNC)
+ bug("nl_get_reply: got truncated reply which should be impossible");
+ }
+ if (NLMSG_OK(nl->last_hdr, nl->last_size))
+ {
+ struct nlmsghdr *h = nl->last_hdr;
+ nl->last_hdr = NLMSG_NEXT(h, nl->last_size);
+ if (h->nlmsg_seq != nl->seq)
+ {
+ log(L_WARN "nl_get_reply: Ignoring out of sequence netlink packet (%x != %x)",
+ h->nlmsg_seq, nl->seq);
+ continue;
+ }
+ return h;
+ }
+ if (nl->last_size)
+ log(L_WARN "nl_get_reply: Found packet remnant of size %d", nl->last_size);
+ nl->last_hdr = NULL;
+ }
+}
+
+static struct tbf rl_netlink_err = TBF_DEFAULT_LOG_LIMITS;
+
+static int
+nl_error(struct nlmsghdr *h, int ignore_esrch)
+{
+ struct nlmsgerr *e;
+ int ec;
+
+ if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
+ {
+ log(L_WARN "Netlink: Truncated error message received");
+ return ENOBUFS;
+ }
+ e = (struct nlmsgerr *) NLMSG_DATA(h);
+ ec = -e->error;
+ if (ec && !(ignore_esrch && (ec == ESRCH)))
+ log_rl(&rl_netlink_err, L_WARN "Netlink: %s", strerror(ec));
+ return ec;
+}
+
+static struct nlmsghdr *
+nl_get_scan(void)
+{
+ struct nlmsghdr *h = nl_get_reply(&nl_scan);
+
+ if (h->nlmsg_type == NLMSG_DONE)
+ return NULL;
+ if (h->nlmsg_type == NLMSG_ERROR)
+ {
+ nl_error(h, 0);
+ return NULL;
+ }
+ return h;
+}
+
+static int
+nl_exchange(struct nlmsghdr *pkt, int ignore_esrch)
+{
+ struct nlmsghdr *h;
+
+ nl_send(&nl_req, pkt);
+ for(;;)
+ {
+ h = nl_get_reply(&nl_req);
+ if (h->nlmsg_type == NLMSG_ERROR)
+ break;
+ log(L_WARN "nl_exchange: Unexpected reply received");
+ }
+ return nl_error(h, ignore_esrch) ? -1 : 0;
+}
+
+/*
+ * Netlink attributes
+ */
+
+static int nl_attr_len;
+
+static void *
+nl_checkin(struct nlmsghdr *h, int lsize)
+{
+ nl_attr_len = h->nlmsg_len - NLMSG_LENGTH(lsize);
+ if (nl_attr_len < 0)
+ {
+ log(L_ERR "nl_checkin: underrun by %d bytes", -nl_attr_len);
+ return NULL;
+ }
+ return NLMSG_DATA(h);
+}
+
+struct nl_want_attrs {
+ u8 defined:1;
+ u8 checksize:1;
+ u8 size;
+};
+
+
+#define BIRD_IFLA_MAX (IFLA_WIRELESS+1)
+
+static struct nl_want_attrs ifla_attr_want[BIRD_IFLA_MAX] = {
+ [IFLA_IFNAME] = { 1, 0, 0 },
+ [IFLA_MTU] = { 1, 1, sizeof(u32) },
+ [IFLA_MASTER] = { 1, 1, sizeof(u32) },
+ [IFLA_WIRELESS] = { 1, 0, 0 },
+};
+
+
+#define BIRD_IFA_MAX (IFA_FLAGS+1)
+
+static struct nl_want_attrs ifa_attr_want4[BIRD_IFA_MAX] = {
+ [IFA_ADDRESS] = { 1, 1, sizeof(ip4_addr) },
+ [IFA_LOCAL] = { 1, 1, sizeof(ip4_addr) },
+ [IFA_BROADCAST] = { 1, 1, sizeof(ip4_addr) },
+ [IFA_FLAGS] = { 1, 1, sizeof(u32) },
+};
+
+static struct nl_want_attrs ifa_attr_want6[BIRD_IFA_MAX] = {
+ [IFA_ADDRESS] = { 1, 1, sizeof(ip6_addr) },
+ [IFA_LOCAL] = { 1, 1, sizeof(ip6_addr) },
+ [IFA_FLAGS] = { 1, 1, sizeof(u32) },
+};
+
+
+#define BIRD_RTA_MAX (RTA_ENCAP+1)
+
+static struct nl_want_attrs nexthop_attr_want4[BIRD_RTA_MAX] = {
+ [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) },
+ [RTA_VIA] = { 1, 0, 0 },
+ [RTA_FLOW] = { 1, 1, sizeof(u32) },
+ [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) },
+ [RTA_ENCAP] = { 1, 0, 0 },
+};
+
+static struct nl_want_attrs nexthop_attr_want6[BIRD_RTA_MAX] = {
+ [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) },
+ [RTA_VIA] = { 1, 0, 0 },
+ [RTA_FLOW] = { 1, 1, sizeof(u32) },
+ [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) },
+ [RTA_ENCAP] = { 1, 0, 0 },
+};
+
+#ifdef HAVE_MPLS_KERNEL
+static struct nl_want_attrs nexthop_attr_want_mpls[BIRD_RTA_MAX] = {
+ [RTA_VIA] = { 1, 0, 0 },
+ [RTA_NEWDST] = { 1, 0, 0 },
+};
+
+static struct nl_want_attrs encap_mpls_want[BIRD_RTA_MAX] = {
+ [RTA_DST] = { 1, 0, 0 },
+};
+#endif
+
+static struct nl_want_attrs rtm_attr_want4[BIRD_RTA_MAX] = {
+ [RTA_DST] = { 1, 1, sizeof(ip4_addr) },
+ [RTA_OIF] = { 1, 1, sizeof(u32) },
+ [RTA_GATEWAY] = { 1, 1, sizeof(ip4_addr) },
+ [RTA_PRIORITY] = { 1, 1, sizeof(u32) },
+ [RTA_PREFSRC] = { 1, 1, sizeof(ip4_addr) },
+ [RTA_METRICS] = { 1, 0, 0 },
+ [RTA_MULTIPATH] = { 1, 0, 0 },
+ [RTA_FLOW] = { 1, 1, sizeof(u32) },
+ [RTA_TABLE] = { 1, 1, sizeof(u32) },
+ [RTA_VIA] = { 1, 0, 0 },
+ [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) },
+ [RTA_ENCAP] = { 1, 0, 0 },
+};
+
+static struct nl_want_attrs rtm_attr_want6[BIRD_RTA_MAX] = {
+ [RTA_DST] = { 1, 1, sizeof(ip6_addr) },
+ [RTA_SRC] = { 1, 1, sizeof(ip6_addr) },
+ [RTA_IIF] = { 1, 1, sizeof(u32) },
+ [RTA_OIF] = { 1, 1, sizeof(u32) },
+ [RTA_GATEWAY] = { 1, 1, sizeof(ip6_addr) },
+ [RTA_PRIORITY] = { 1, 1, sizeof(u32) },
+ [RTA_PREFSRC] = { 1, 1, sizeof(ip6_addr) },
+ [RTA_METRICS] = { 1, 0, 0 },
+ [RTA_MULTIPATH] = { 1, 0, 0 },
+ [RTA_FLOW] = { 1, 1, sizeof(u32) },
+ [RTA_TABLE] = { 1, 1, sizeof(u32) },
+ [RTA_VIA] = { 1, 0, 0 },
+ [RTA_ENCAP_TYPE]= { 1, 1, sizeof(u16) },
+ [RTA_ENCAP] = { 1, 0, 0 },
+};
+
+#ifdef HAVE_MPLS_KERNEL
+static struct nl_want_attrs rtm_attr_want_mpls[BIRD_RTA_MAX] = {
+ [RTA_DST] = { 1, 1, sizeof(u32) },
+ [RTA_IIF] = { 1, 1, sizeof(u32) },
+ [RTA_OIF] = { 1, 1, sizeof(u32) },
+ [RTA_PRIORITY] = { 1, 1, sizeof(u32) },
+ [RTA_METRICS] = { 1, 0, 0 },
+ [RTA_MULTIPATH] = { 1, 0, 0 },
+ [RTA_FLOW] = { 1, 1, sizeof(u32) },
+ [RTA_TABLE] = { 1, 1, sizeof(u32) },
+ [RTA_VIA] = { 1, 0, 0 },
+ [RTA_NEWDST] = { 1, 0, 0 },
+};
+#endif
+
+
+static int
+nl_parse_attrs(struct rtattr *a, struct nl_want_attrs *want, struct rtattr **k, int ksize)
+{
+ int max = ksize / sizeof(struct rtattr *);
+ bzero(k, ksize);
+
+ for ( ; RTA_OK(a, nl_attr_len); a = RTA_NEXT(a, nl_attr_len))
+ {
+ if ((a->rta_type >= max) || !want[a->rta_type].defined)
+ continue;
+
+ if (want[a->rta_type].checksize && (RTA_PAYLOAD(a) != want[a->rta_type].size))
+ {
+ log(L_ERR "nl_parse_attrs: Malformed attribute received");
+ return 0;
+ }
+
+ k[a->rta_type] = a;
+ }
+
+ if (nl_attr_len)
+ {
+ log(L_ERR "nl_parse_attrs: remnant of size %d", nl_attr_len);
+ return 0;
+ }
+
+ return 1;
+}
+
+static inline u16 rta_get_u16(struct rtattr *a)
+{ return *(u16 *) RTA_DATA(a); }
+
+static inline u32 rta_get_u32(struct rtattr *a)
+{ return *(u32 *) RTA_DATA(a); }
+
+static inline ip4_addr rta_get_ip4(struct rtattr *a)
+{ return ip4_ntoh(*(ip4_addr *) RTA_DATA(a)); }
+
+static inline ip6_addr rta_get_ip6(struct rtattr *a)
+{ return ip6_ntoh(*(ip6_addr *) RTA_DATA(a)); }
+
+static inline ip_addr rta_get_ipa(struct rtattr *a)
+{
+ if (RTA_PAYLOAD(a) == sizeof(ip4_addr))
+ return ipa_from_ip4(rta_get_ip4(a));
+ else
+ return ipa_from_ip6(rta_get_ip6(a));
+}
+
+#ifdef HAVE_MPLS_KERNEL
+static inline ip_addr rta_get_via(struct rtattr *a)
+{
+ struct rtvia *v = RTA_DATA(a);
+ switch(v->rtvia_family) {
+ case AF_INET: return ipa_from_ip4(ip4_ntoh(*(ip4_addr *) v->rtvia_addr));
+ case AF_INET6: return ipa_from_ip6(ip6_ntoh(*(ip6_addr *) v->rtvia_addr));
+ }
+ return IPA_NONE;
+}
+
+static u32 rta_mpls_stack[MPLS_MAX_LABEL_STACK];
+static inline int rta_get_mpls(struct rtattr *a, u32 *stack)
+{
+ if (!a)
+ return 0;
+
+ if (RTA_PAYLOAD(a) % 4)
+ log(L_WARN "KRT: Strange length of received MPLS stack: %u", RTA_PAYLOAD(a));
+
+ int labels = mpls_get(RTA_DATA(a), RTA_PAYLOAD(a) & ~0x3, stack);
+
+ if (labels < 0)
+ {
+ log(L_WARN "KRT: Too long MPLS stack received, ignoring");
+ labels = 0;
+ }
+
+ return labels;
+}
+#endif
+
+struct rtattr *
+nl_add_attr(struct nlmsghdr *h, uint bufsize, uint code, const void *data, uint dlen)
+{
+ uint pos = NLMSG_ALIGN(h->nlmsg_len);
+ uint len = RTA_LENGTH(dlen);
+
+ if (pos + len > bufsize)
+ bug("nl_add_attr: packet buffer overflow");
+
+ struct rtattr *a = (struct rtattr *)((char *)h + pos);
+ a->rta_type = code;
+ a->rta_len = len;
+ h->nlmsg_len = pos + len;
+
+ if (dlen > 0)
+ memcpy(RTA_DATA(a), data, dlen);
+
+ return a;
+}
+
+static inline struct rtattr *
+nl_open_attr(struct nlmsghdr *h, uint bufsize, uint code)
+{
+ return nl_add_attr(h, bufsize, code, NULL, 0);
+}
+
+static inline void
+nl_close_attr(struct nlmsghdr *h, struct rtattr *a)
+{
+ a->rta_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)a;
+}
+
+static inline void
+nl_add_attr_u16(struct nlmsghdr *h, uint bufsize, int code, u16 data)
+{
+ nl_add_attr(h, bufsize, code, &data, 2);
+}
+
+static inline void
+nl_add_attr_u32(struct nlmsghdr *h, uint bufsize, int code, u32 data)
+{
+ nl_add_attr(h, bufsize, code, &data, 4);
+}
+
+static inline void
+nl_add_attr_ip4(struct nlmsghdr *h, uint bufsize, int code, ip4_addr ip4)
+{
+ ip4 = ip4_hton(ip4);
+ nl_add_attr(h, bufsize, code, &ip4, sizeof(ip4));
+}
+
+static inline void
+nl_add_attr_ip6(struct nlmsghdr *h, uint bufsize, int code, ip6_addr ip6)
+{
+ ip6 = ip6_hton(ip6);
+ nl_add_attr(h, bufsize, code, &ip6, sizeof(ip6));
+}
+
+static inline void
+nl_add_attr_ipa(struct nlmsghdr *h, uint bufsize, int code, ip_addr ipa)
+{
+ if (ipa_is_ip4(ipa))
+ nl_add_attr_ip4(h, bufsize, code, ipa_to_ip4(ipa));
+ else
+ nl_add_attr_ip6(h, bufsize, code, ipa_to_ip6(ipa));
+}
+
+#ifdef HAVE_MPLS_KERNEL
+static inline void
+nl_add_attr_mpls(struct nlmsghdr *h, uint bufsize, int code, int len, u32 *stack)
+{
+ char buf[len*4];
+ mpls_put(buf, len, stack);
+ nl_add_attr(h, bufsize, code, buf, len*4);
+}
+
+static inline void
+nl_add_attr_mpls_encap(struct nlmsghdr *h, uint bufsize, int len, u32 *stack)
+{
+ nl_add_attr_u16(h, bufsize, RTA_ENCAP_TYPE, LWTUNNEL_ENCAP_MPLS);
+
+ struct rtattr *nest = nl_open_attr(h, bufsize, RTA_ENCAP);
+ nl_add_attr_mpls(h, bufsize, RTA_DST, len, stack);
+ nl_close_attr(h, nest);
+}
+
+static inline void
+nl_add_attr_via(struct nlmsghdr *h, uint bufsize, ip_addr ipa)
+{
+ struct rtvia *via = alloca(sizeof(struct rtvia) + 16);
+
+ if (ipa_is_ip4(ipa))
+ {
+ via->rtvia_family = AF_INET;
+ put_ip4(via->rtvia_addr, ipa_to_ip4(ipa));
+ nl_add_attr(h, bufsize, RTA_VIA, via, sizeof(struct rtvia) + 4);
+ }
+ else
+ {
+ via->rtvia_family = AF_INET6;
+ put_ip6(via->rtvia_addr, ipa_to_ip6(ipa));
+ nl_add_attr(h, bufsize, RTA_VIA, via, sizeof(struct rtvia) + 16);
+ }
+}
+#endif
+
+static inline struct rtnexthop *
+nl_open_nexthop(struct nlmsghdr *h, uint bufsize)
+{
+ uint pos = NLMSG_ALIGN(h->nlmsg_len);
+ uint len = RTNH_LENGTH(0);
+
+ if (pos + len > bufsize)
+ bug("nl_open_nexthop: packet buffer overflow");
+
+ h->nlmsg_len = pos + len;
+
+ return (void *)h + pos;
+}
+
+static inline void
+nl_close_nexthop(struct nlmsghdr *h, struct rtnexthop *nh)
+{
+ nh->rtnh_len = (void *)h + NLMSG_ALIGN(h->nlmsg_len) - (void *)nh;
+}
+
+static inline void
+nl_add_nexthop(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af UNUSED)
+{
+#ifdef HAVE_MPLS_KERNEL
+ if (nh->labels > 0)
+ if (af == AF_MPLS)
+ nl_add_attr_mpls(h, bufsize, RTA_NEWDST, nh->labels, nh->label);
+ else
+ nl_add_attr_mpls_encap(h, bufsize, nh->labels, nh->label);
+
+ if (ipa_nonzero(nh->gw))
+ {
+ if (af == (ipa_is_ip4(nh->gw) ? AF_INET : AF_INET6))
+ nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw);
+ else
+ nl_add_attr_via(h, bufsize, nh->gw);
+ }
+#else
+
+ if (ipa_nonzero(nh->gw))
+ nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw);
+#endif
+}
+
+static void
+nl_add_multipath(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af, ea_list *eattrs)
+{
+ struct rtattr *a = nl_open_attr(h, bufsize, RTA_MULTIPATH);
+ eattr *flow = ea_find(eattrs, EA_KRT_REALM);
+
+ for (; nh; nh = nh->next)
+ {
+ struct rtnexthop *rtnh = nl_open_nexthop(h, bufsize);
+
+ rtnh->rtnh_flags = 0;
+ rtnh->rtnh_hops = nh->weight;
+ rtnh->rtnh_ifindex = nh->iface->index;
+
+ nl_add_nexthop(h, bufsize, nh, af);
+
+ if (nh->flags & RNF_ONLINK)
+ rtnh->rtnh_flags |= RTNH_F_ONLINK;
+
+ /* Our KRT_REALM is per-route, but kernel RTA_FLOW is per-nexthop.
+ Therefore, we need to attach the same attribute to each nexthop. */
+ if (flow)
+ nl_add_attr_u32(h, bufsize, RTA_FLOW, flow->u.data);
+
+ nl_close_nexthop(h, rtnh);
+ }
+
+ nl_close_attr(h, a);
+}
+
+static struct nexthop *
+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);
+ struct nexthop *rv, *first, **last;
+ unsigned len = RTA_PAYLOAD(ra);
+
+ first = NULL;
+ last = &first;
+
+ while (len)
+ {
+ /* Use RTNH_OK(nh,len) ?? */
+ if ((len < sizeof(*nh)) || (len < nh->rtnh_len))
+ goto err;
+
+ if ((nh->rtnh_flags & RTNH_F_DEAD) && (krt_src != KRT_SRC_BIRD))
+ goto next;
+
+ *last = rv = lp_allocz(s->pool, NEXTHOP_MAX_SIZE);
+ last = &(rv->next);
+
+ rv->weight = nh->rtnh_hops;
+ rv->iface = if_find_by_index(nh->rtnh_ifindex);
+ if (!rv->iface)
+ {
+ 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);
+ switch (af)
+ {
+ case AF_INET:
+ if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want4, a, sizeof(a)))
+ goto err;
+ break;
+
+ case AF_INET6:
+ if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want6, a, sizeof(a)))
+ goto err;
+ break;
+
+#ifdef HAVE_MPLS_KERNEL
+ case AF_MPLS:
+ if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want_mpls, a, sizeof(a)))
+ goto err;
+
+ if (a[RTA_NEWDST])
+ rv->labels = rta_get_mpls(a[RTA_NEWDST], rv->label);
+
+ break;
+#endif
+
+ default:
+ goto err;
+ }
+
+ if (a[RTA_GATEWAY])
+ rv->gw = rta_get_ipa(a[RTA_GATEWAY]);
+
+ if (a[RTA_FLOW])
+ s->rta_flow = rta_get_u32(a[RTA_FLOW]);
+
+#ifdef HAVE_MPLS_KERNEL
+ if (a[RTA_VIA])
+ rv->gw = rta_get_via(a[RTA_VIA]);
+#endif
+
+ if (ipa_nonzero(rv->gw))
+ {
+ if (nh->rtnh_flags & RTNH_F_ONLINK)
+ rv->flags |= RNF_ONLINK;
+
+ neighbor *nbr;
+ nbr = neigh_find(&p->p, rv->gw, rv->iface,
+ (rv->flags & RNF_ONLINK) ? NEF_ONLINK : 0);
+ if (!nbr || (nbr->scope == SCOPE_HOST))
+ {
+ 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: Received route %N with unknown encapsulation method %d",
+ n, rta_get_u16(a[RTA_ENCAP_TYPE]));
+ return NULL;
+ }
+
+ struct rtattr *enca[BIRD_RTA_MAX];
+ nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]);
+ nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca));
+ rv->labels = rta_get_mpls(enca[RTA_DST], rv->label);
+ }
+#endif
+
+ next:
+ len -= NLMSG_ALIGN(nh->rtnh_len);
+ nh = RTNH_NEXT(nh);
+ }
+
+ /* Ensure nexthops are sorted to satisfy nest invariant */
+ if (!nexthop_is_sorted(first))
+ first = nexthop_sort(first);
+
+ return first;
+
+err:
+ log(L_ERR "KRT: Received strange multipath route %N", n);
+ return NULL;
+}
+
+static void
+nl_add_metrics(struct nlmsghdr *h, uint bufsize, u32 *metrics, int max)
+{
+ struct rtattr *a = nl_open_attr(h, bufsize, RTA_METRICS);
+ int t;
+
+ for (t = 1; t < max; t++)
+ if (metrics[0] & (1 << t))
+ nl_add_attr_u32(h, bufsize, t, metrics[t]);
+
+ nl_close_attr(h, a);
+}
+
+static int
+nl_parse_metrics(struct rtattr *hdr, u32 *metrics, int max)
+{
+ struct rtattr *a = RTA_DATA(hdr);
+ int len = RTA_PAYLOAD(hdr);
+
+ metrics[0] = 0;
+ for (; RTA_OK(a, len); a = RTA_NEXT(a, len))
+ {
+ if (a->rta_type == RTA_UNSPEC)
+ continue;
+
+ if (a->rta_type >= max)
+ continue;
+
+ if (RTA_PAYLOAD(a) != 4)
+ return -1;
+
+ metrics[0] |= 1 << a->rta_type;
+ metrics[a->rta_type] = rta_get_u32(a);
+ }
+
+ if (len > 0)
+ return -1;
+
+ return 0;
+}
+
+
+/*
+ * Scanning of interfaces
+ */
+
+static void
+nl_parse_link(struct nlmsghdr *h, int scan)
+{
+ struct ifinfomsg *i;
+ struct rtattr *a[BIRD_IFLA_MAX];
+ int new = h->nlmsg_type == RTM_NEWLINK;
+ struct iface f = {};
+ struct iface *ifi;
+ char *name;
+ u32 mtu, master = 0;
+ uint fl;
+
+ if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFLA_RTA(i), ifla_attr_want, a, sizeof(a)))
+ return;
+ if (!a[IFLA_IFNAME] || (RTA_PAYLOAD(a[IFLA_IFNAME]) < 2) || !a[IFLA_MTU])
+ {
+ /*
+ * IFLA_IFNAME and IFLA_MTU are required, in fact, but there may also come
+ * a message with IFLA_WIRELESS set, where (e.g.) no IFLA_IFNAME exists.
+ * We simply ignore all such messages with IFLA_WIRELESS without notice.
+ */
+
+ if (a[IFLA_WIRELESS])
+ return;
+
+ log(L_ERR "KIF: Malformed message received");
+ return;
+ }
+
+ name = RTA_DATA(a[IFLA_IFNAME]);
+ mtu = rta_get_u32(a[IFLA_MTU]);
+
+ if (a[IFLA_MASTER])
+ master = rta_get_u32(a[IFLA_MASTER]);
+
+ ifi = if_find_by_index(i->ifi_index);
+ if (!new)
+ {
+ DBG("KIF: IF%d(%s) goes down\n", i->ifi_index, name);
+ if (!ifi)
+ return;
+
+ if_delete(ifi);
+ }
+ else
+ {
+ DBG("KIF: IF%d(%s) goes up (mtu=%d,flg=%x)\n", i->ifi_index, name, mtu, i->ifi_flags);
+ if (ifi && strncmp(ifi->name, name, sizeof(ifi->name)-1))
+ if_delete(ifi);
+
+ strncpy(f.name, name, sizeof(f.name)-1);
+ f.index = i->ifi_index;
+ f.mtu = mtu;
+
+ f.master_index = master;
+ f.master = if_find_by_index(master);
+
+ fl = i->ifi_flags;
+ if (fl & IFF_UP)
+ f.flags |= IF_ADMIN_UP;
+ if (fl & IFF_LOWER_UP)
+ f.flags |= IF_LINK_UP;
+ if (fl & IFF_LOOPBACK) /* Loopback */
+ f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE;
+ else if (fl & IFF_POINTOPOINT) /* PtP */
+ f.flags |= IF_MULTICAST;
+ else if (fl & IFF_BROADCAST) /* Broadcast */
+ f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST;
+ else
+ f.flags |= IF_MULTIACCESS; /* NBMA */
+
+ if (fl & IFF_MULTICAST)
+ f.flags |= IF_MULTICAST;
+
+ ifi = if_update(&f);
+
+ if (!scan)
+ if_end_partial_update(ifi);
+ }
+}
+
+static void
+nl_parse_addr4(struct ifaddrmsg *i, int scan, int new)
+{
+ struct rtattr *a[BIRD_IFA_MAX];
+ struct iface *ifi;
+ u32 ifa_flags;
+ int scope;
+
+ if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want4, a, sizeof(a)))
+ return;
+
+ if (!a[IFA_LOCAL])
+ {
+ log(L_ERR "KIF: Malformed message received (missing IFA_LOCAL)");
+ return;
+ }
+ if (!a[IFA_ADDRESS])
+ {
+ log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)");
+ return;
+ }
+
+ ifi = if_find_by_index(i->ifa_index);
+ if (!ifi)
+ {
+ log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index);
+ return;
+ }
+
+ if (a[IFA_FLAGS])
+ ifa_flags = rta_get_u32(a[IFA_FLAGS]);
+ else
+ ifa_flags = i->ifa_flags;
+
+ struct ifa ifa;
+ bzero(&ifa, sizeof(ifa));
+ ifa.iface = ifi;
+ if (ifa_flags & IFA_F_SECONDARY)
+ ifa.flags |= IA_SECONDARY;
+
+ ifa.ip = rta_get_ipa(a[IFA_LOCAL]);
+
+ if (i->ifa_prefixlen > IP4_MAX_PREFIX_LENGTH)
+ {
+ log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen);
+ new = 0;
+ }
+ if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH)
+ {
+ ifa.brd = rta_get_ipa(a[IFA_ADDRESS]);
+ net_fill_ip4(&ifa.prefix, rta_get_ip4(a[IFA_ADDRESS]), i->ifa_prefixlen);
+
+ /* It is either a host address or a peer address */
+ if (ipa_equal(ifa.ip, ifa.brd))
+ ifa.flags |= IA_HOST;
+ else
+ {
+ ifa.flags |= IA_PEER;
+ ifa.opposite = ifa.brd;
+ }
+ }
+ else
+ {
+ net_fill_ip4(&ifa.prefix, ipa_to_ip4(ifa.ip), i->ifa_prefixlen);
+ net_normalize(&ifa.prefix);
+
+ if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 1)
+ ifa.opposite = ipa_opposite_m1(ifa.ip);
+
+ if (i->ifa_prefixlen == IP4_MAX_PREFIX_LENGTH - 2)
+ ifa.opposite = ipa_opposite_m2(ifa.ip);
+
+ if (ifi->flags & IF_BROADCAST)
+ {
+ /* If kernel offers us a broadcast address, we trust it */
+ if (a[IFA_BROADCAST])
+ ifa.brd = ipa_from_ip4(rta_get_ip4(a[IFA_BROADCAST]));
+ /* Otherwise we create one (except for /31) */
+ else if (i->ifa_prefixlen < (IP4_MAX_PREFIX_LENGTH - 1))
+ ifa.brd = ipa_from_ip4(ip4_or(ipa_to_ip4(ifa.ip),
+ ip4_not(ip4_mkmask(i->ifa_prefixlen))));
+ }
+ }
+
+ scope = ipa_classify(ifa.ip);
+ if (scope < 0)
+ {
+ log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name);
+ return;
+ }
+ ifa.scope = scope & IADDR_SCOPE_MASK;
+
+ DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %N, brd %I, opp %I\n",
+ ifi->index, ifi->name,
+ new ? "added" : "removed",
+ ifa.ip, ifa.flags, &ifa.prefix, ifa.brd, ifa.opposite);
+
+ if (new)
+ ifa_update(&ifa);
+ else
+ ifa_delete(&ifa);
+
+ if (!scan)
+ if_end_partial_update(ifi);
+}
+
+static void
+nl_parse_addr6(struct ifaddrmsg *i, int scan, int new)
+{
+ struct rtattr *a[BIRD_IFA_MAX];
+ struct iface *ifi;
+ u32 ifa_flags;
+ int scope;
+
+ if (!nl_parse_attrs(IFA_RTA(i), ifa_attr_want6, a, sizeof(a)))
+ return;
+
+ if (!a[IFA_ADDRESS])
+ {
+ log(L_ERR "KIF: Malformed message received (missing IFA_ADDRESS)");
+ return;
+ }
+
+ ifi = if_find_by_index(i->ifa_index);
+ if (!ifi)
+ {
+ log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index);
+ return;
+ }
+
+ if (a[IFA_FLAGS])
+ ifa_flags = rta_get_u32(a[IFA_FLAGS]);
+ else
+ ifa_flags = i->ifa_flags;
+
+ struct ifa ifa;
+ bzero(&ifa, sizeof(ifa));
+ ifa.iface = ifi;
+ if (ifa_flags & IFA_F_SECONDARY)
+ ifa.flags |= IA_SECONDARY;
+
+ /* Ignore tentative addresses silently */
+ if (ifa_flags & IFA_F_TENTATIVE)
+ return;
+
+ /* IFA_LOCAL can be unset for IPv6 interfaces */
+ ifa.ip = rta_get_ipa(a[IFA_LOCAL] ? : a[IFA_ADDRESS]);
+
+ if (i->ifa_prefixlen > IP6_MAX_PREFIX_LENGTH)
+ {
+ log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen);
+ new = 0;
+ }
+ if (i->ifa_prefixlen == IP6_MAX_PREFIX_LENGTH)
+ {
+ ifa.brd = rta_get_ipa(a[IFA_ADDRESS]);
+ net_fill_ip6(&ifa.prefix, rta_get_ip6(a[IFA_ADDRESS]), i->ifa_prefixlen);
+
+ /* It is either a host address or a peer address */
+ if (ipa_equal(ifa.ip, ifa.brd))
+ ifa.flags |= IA_HOST;
+ else
+ {
+ ifa.flags |= IA_PEER;
+ ifa.opposite = ifa.brd;
+ }
+ }
+ else
+ {
+ net_fill_ip6(&ifa.prefix, ipa_to_ip6(ifa.ip), i->ifa_prefixlen);
+ net_normalize(&ifa.prefix);
+
+ if (i->ifa_prefixlen == IP6_MAX_PREFIX_LENGTH - 1)
+ ifa.opposite = ipa_opposite_m1(ifa.ip);
+ }
+
+ scope = ipa_classify(ifa.ip);
+ if (scope < 0)
+ {
+ log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name);
+ return;
+ }
+ ifa.scope = scope & IADDR_SCOPE_MASK;
+
+ DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %N, brd %I, opp %I\n",
+ ifi->index, ifi->name,
+ new ? "added" : "removed",
+ ifa.ip, ifa.flags, &ifa.prefix, ifa.brd, ifa.opposite);
+
+ if (new)
+ ifa_update(&ifa);
+ else
+ ifa_delete(&ifa);
+
+ if (!scan)
+ if_end_partial_update(ifi);
+}
+
+static void
+nl_parse_addr(struct nlmsghdr *h, int scan)
+{
+ struct ifaddrmsg *i;
+
+ if (!(i = nl_checkin(h, sizeof(*i))))
+ return;
+
+ int new = (h->nlmsg_type == RTM_NEWADDR);
+
+ switch (i->ifa_family)
+ {
+ case AF_INET:
+ return nl_parse_addr4(i, scan, new);
+
+ case AF_INET6:
+ return nl_parse_addr6(i, scan, new);
+ }
+}
+
+void
+kif_do_scan(struct kif_proto *p UNUSED)
+{
+ struct nlmsghdr *h;
+
+ if_start_update();
+
+ nl_request_dump(AF_UNSPEC, RTM_GETLINK);
+ while (h = nl_get_scan())
+ if (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)
+ nl_parse_link(h, 1);
+ else
+ log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type);
+
+ /* Re-resolve master interface for slaves */
+ struct iface *i;
+ WALK_LIST(i, iface_list)
+ if (i->master_index)
+ {
+ struct iface f = {
+ .flags = i->flags,
+ .mtu = i->mtu,
+ .index = i->index,
+ .master_index = i->master_index,
+ .master = if_find_by_index(i->master_index)
+ };
+
+ if (f.master != i->master)
+ {
+ memcpy(f.name, i->name, sizeof(f.name));
+ if_update(&f);
+ }
+ }
+
+ nl_request_dump(AF_INET, RTM_GETADDR);
+ 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);
+ 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);
+
+ if_end_update();
+}
+
+/*
+ * Routes
+ */
+
+static inline u32
+krt_table_id(struct krt_proto *p)
+{
+ return KRT_CF->sys.table_id;
+}
+
+static HASH(struct krt_proto) nl_table_map;
+
+#define RTH_KEY(p) p->af, krt_table_id(p)
+#define RTH_NEXT(p) p->sys.hash_next
+#define RTH_EQ(a1,i1,a2,i2) a1 == a2 && i1 == i2
+#define RTH_FN(a,i) a ^ u32_hash(i)
+
+#define RTH_REHASH rth_rehash
+#define RTH_PARAMS /8, *2, 2, 2, 6, 20
+
+HASH_DEFINE_REHASH_FN(RTH, struct krt_proto)
+
+int
+krt_capable(rte *e)
+{
+ rta *a = e->attrs;
+
+ switch (a->dest)
+ {
+ case RTD_UNICAST:
+ case RTD_BLACKHOLE:
+ case RTD_UNREACHABLE:
+ case RTD_PROHIBIT:
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static inline int
+nh_bufsize(struct nexthop *nh)
+{
+ int rv = 0;
+ for (; nh != NULL; nh = nh->next)
+ rv += RTNH_LENGTH(RTA_LENGTH(sizeof(ip_addr)));
+ return rv;
+}
+
+static int
+nl_send_route(struct krt_proto *p, rte *e, int op, int dest, struct nexthop *nh)
+{
+ eattr *ea;
+ net *net = e->net;
+ rta *a = e->attrs;
+ ea_list *eattrs = a->eattrs;
+ int bufsize = 128 + KRT_METRICS_MAX*8 + nh_bufsize(&(a->nh));
+ u32 priority = 0;
+
+ struct {
+ struct nlmsghdr h;
+ struct rtmsg r;
+ char buf[0];
+ } *r;
+
+ int rsize = sizeof(*r) + bufsize;
+ r = alloca(rsize);
+
+ DBG("nl_send_route(%N,op=%x)\n", net->n.addr, op);
+
+ bzero(&r->h, sizeof(r->h));
+ bzero(&r->r, sizeof(r->r));
+ r->h.nlmsg_type = op ? RTM_NEWROUTE : RTM_DELROUTE;
+ r->h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
+ r->h.nlmsg_flags = op | NLM_F_REQUEST | NLM_F_ACK;
+
+ r->r.rtm_family = p->af;
+ r->r.rtm_dst_len = net_pxlen(net->n.addr);
+ r->r.rtm_protocol = RTPROT_BIRD;
+ r->r.rtm_scope = RT_SCOPE_NOWHERE;
+#ifdef HAVE_MPLS_KERNEL
+ if (p->af == AF_MPLS)
+ {
+ /*
+ * Kernel MPLS code is a bit picky. We must:
+ * 1) Always set RT_SCOPE_UNIVERSE and RTN_UNICAST (even for RTM_DELROUTE)
+ * 2) Never use RTA_PRIORITY
+ */
+
+ u32 label = net_mpls(net->n.addr);
+ nl_add_attr_mpls(&r->h, rsize, RTA_DST, 1, &label);
+ r->r.rtm_scope = RT_SCOPE_UNIVERSE;
+ r->r.rtm_type = RTN_UNICAST;
+ }
+ else
+#endif
+ {
+ nl_add_attr_ipa(&r->h, rsize, RTA_DST, net_prefix(net->n.addr));
+
+ /* Add source address for IPv6 SADR routes */
+ if (net->n.addr->type == NET_IP6_SADR)
+ {
+ net_addr_ip6_sadr *a = (void *) &net->n.addr;
+ nl_add_attr_ip6(&r->h, rsize, RTA_SRC, a->src_prefix);
+ r->r.rtm_src_len = a->src_pxlen;
+ }
+ }
+
+ /*
+ * Strange behavior for RTM_DELROUTE:
+ * 1) rtm_family is ignored in IPv6, works for IPv4
+ * 2) not setting RTA_PRIORITY is different from setting default value (on IPv6)
+ * 3) not setting RTA_PRIORITY is equivalent to setting 0, which is wildcard
+ */
+
+ if (krt_table_id(p) < 256)
+ r->r.rtm_table = krt_table_id(p);
+ else
+ nl_add_attr_u32(&r->h, rsize, RTA_TABLE, krt_table_id(p));
+
+ if (p->af == AF_MPLS)
+ priority = 0;
+ else if (a->source == RTS_DUMMY)
+ priority = e->u.krt.metric;
+ else if (KRT_CF->sys.metric)
+ priority = KRT_CF->sys.metric;
+ else if ((op != NL_OP_DELETE) && (ea = ea_find(eattrs, EA_KRT_METRIC)))
+ priority = ea->u.data;
+
+ if (priority)
+ nl_add_attr_u32(&r->h, rsize, RTA_PRIORITY, priority);
+
+ /* For route delete, we do not specify remaining route attributes */
+ if (op == NL_OP_DELETE)
+ goto dest;
+
+ /* Default scope is LINK for device routes, UNIVERSE otherwise */
+ if (p->af == AF_MPLS)
+ r->r.rtm_scope = RT_SCOPE_UNIVERSE;
+ else if (ea = ea_find(eattrs, EA_KRT_SCOPE))
+ r->r.rtm_scope = ea->u.data;
+ else
+ r->r.rtm_scope = (dest == RTD_UNICAST && ipa_zero(nh->gw)) ? RT_SCOPE_LINK : RT_SCOPE_UNIVERSE;
+
+ if (ea = ea_find(eattrs, EA_KRT_PREFSRC))
+ nl_add_attr_ipa(&r->h, rsize, RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data);
+
+ if (ea = ea_find(eattrs, EA_KRT_REALM))
+ nl_add_attr_u32(&r->h, rsize, RTA_FLOW, ea->u.data);
+
+
+ u32 metrics[KRT_METRICS_MAX];
+ metrics[0] = 0;
+
+ struct ea_walk_state ews = { .eattrs = eattrs };
+ while (ea = ea_walk(&ews, EA_KRT_METRICS, KRT_METRICS_MAX))
+ {
+ int id = ea->id - EA_KRT_METRICS;
+ metrics[0] |= 1 << id;
+ metrics[id] = ea->u.data;
+ }
+
+ if (metrics[0])
+ nl_add_metrics(&r->h, rsize, metrics, KRT_METRICS_MAX);
+
+
+dest:
+ switch (dest)
+ {
+ case RTD_UNICAST:
+ r->r.rtm_type = RTN_UNICAST;
+ if (nh->next && !krt_ecmp6(p))
+ nl_add_multipath(&r->h, rsize, nh, p->af, eattrs);
+ else
+ {
+ nl_add_attr_u32(&r->h, rsize, RTA_OIF, nh->iface->index);
+ nl_add_nexthop(&r->h, rsize, nh, p->af);
+
+ if (nh->flags & RNF_ONLINK)
+ r->r.rtm_flags |= RTNH_F_ONLINK;
+ }
+ break;
+ case RTD_BLACKHOLE:
+ r->r.rtm_type = RTN_BLACKHOLE;
+ break;
+ case RTD_UNREACHABLE:
+ r->r.rtm_type = RTN_UNREACHABLE;
+ break;
+ case RTD_PROHIBIT:
+ r->r.rtm_type = RTN_PROHIBIT;
+ break;
+ case RTD_NONE:
+ break;
+ default:
+ bug("krt_capable inconsistent with nl_send_route");
+ }
+
+ /* Ignore missing for DELETE */
+ return nl_exchange(&r->h, (op == NL_OP_DELETE));
+}
+
+static inline int
+nl_add_rte(struct krt_proto *p, rte *e)
+{
+ rta *a = e->attrs;
+ int err = 0;
+
+ if (krt_ecmp6(p) && a->nh.next)
+ {
+ struct nexthop *nh = &(a->nh);
+
+ err = nl_send_route(p, e, NL_OP_ADD, RTD_UNICAST, nh);
+ if (err < 0)
+ return err;
+
+ for (nh = nh->next; nh; nh = nh->next)
+ err += nl_send_route(p, e, NL_OP_APPEND, RTD_UNICAST, nh);
+
+ return err;
+ }
+
+ return nl_send_route(p, e, NL_OP_ADD, a->dest, &(a->nh));
+}
+
+static inline int
+nl_delete_rte(struct krt_proto *p, rte *e)
+{
+ int err = 0;
+
+ /* For IPv6, we just repeatedly request DELETE until we get error */
+ do
+ err = nl_send_route(p, e, NL_OP_DELETE, RTD_NONE, NULL);
+ while (krt_ecmp6(p) && !err);
+
+ return err;
+}
+
+static inline int
+nl_replace_rte(struct krt_proto *p, rte *e)
+{
+ rta *a = e->attrs;
+ return nl_send_route(p, e, NL_OP_REPLACE, a->dest, &(a->nh));
+}
+
+
+void
+krt_replace_rte(struct krt_proto *p, net *n UNUSED, rte *new, rte *old)
+{
+ int err = 0;
+
+ /*
+ * We use NL_OP_REPLACE for IPv4, it has an issue with not checking for
+ * matching rtm_protocol, but that is OK when dedicated priority is used.
+ *
+ * We do not use NL_OP_REPLACE for IPv6, as it has broken semantics for ECMP
+ * and with some kernel versions ECMP replace crashes kernel. Would need more
+ * testing and checks for kernel versions.
+ *
+ * For IPv6, we use NL_OP_DELETE and then NL_OP_ADD. We also do not trust the
+ * old route value, so we do not try to optimize IPv6 ECMP reconfigurations.
+ */
+
+ if (krt_ipv4(p) && old && new)
+ {
+ err = nl_replace_rte(p, new);
+ }
+ else
+ {
+ if (old)
+ nl_delete_rte(p, old);
+
+ if (new)
+ err = nl_add_rte(p, new);
+ }
+
+ if (new)
+ {
+ if (err < 0)
+ bmap_clear(&p->sync_map, new->id);
+ else
+ bmap_set(&p->sync_map, new->id);
+ }
+}
+
+static int
+nl_mergable_route(struct nl_parse_state *s, net *net, struct krt_proto *p, uint priority, uint krt_type, uint rtm_family)
+{
+ /* Route merging is used for IPv6 scans */
+ if (!s->scan || (rtm_family != AF_INET6))
+ return 0;
+
+ /* Saved and new route must have same network, proto/table, and priority */
+ if ((s->net != net) || (s->proto != p) || (s->krt_metric != priority))
+ return 0;
+
+ /* Both must be regular unicast routes */
+ if ((s->krt_type != RTN_UNICAST) || (krt_type != RTN_UNICAST))
+ return 0;
+
+ return 1;
+}
+
+static void
+nl_announce_route(struct nl_parse_state *s)
+{
+ rte *e = rte_get_temp(s->attrs);
+ e->net = s->net;
+ e->u.krt.src = s->krt_src;
+ e->u.krt.proto = s->krt_proto;
+ e->u.krt.seen = 0;
+ e->u.krt.best = 0;
+ e->u.krt.metric = s->krt_metric;
+
+ if (s->scan)
+ krt_got_route(s->proto, e);
+ else
+ krt_got_route_async(s->proto, e, s->new);
+
+ s->net = NULL;
+ s->attrs = NULL;
+ s->proto = NULL;
+ lp_flush(s->pool);
+}
+
+static inline void
+nl_parse_begin(struct nl_parse_state *s, int scan)
+{
+ memset(s, 0, sizeof (struct nl_parse_state));
+ s->pool = nl_linpool;
+ s->scan = scan;
+}
+
+static inline void
+nl_parse_end(struct nl_parse_state *s)
+{
+ if (s->net)
+ nl_announce_route(s);
+}
+
+
+#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)
+{
+ struct krt_proto *p;
+ struct rtmsg *i;
+ struct rtattr *a[BIRD_RTA_MAX];
+ int new = h->nlmsg_type == RTM_NEWROUTE;
+
+ net_addr dst, src = {};
+ u32 oif = ~0;
+ u32 table_id;
+ u32 priority = 0;
+ u32 def_scope = RT_SCOPE_UNIVERSE;
+ int krt_src;
+
+ if (!(i = nl_checkin(h, sizeof(*i))))
+ return;
+
+ switch (i->rtm_family)
+ {
+ case AF_INET:
+ if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want4, a, sizeof(a)))
+ return;
+
+ if (a[RTA_DST])
+ net_fill_ip4(&dst, rta_get_ip4(a[RTA_DST]), i->rtm_dst_len);
+ else
+ net_fill_ip4(&dst, IP4_NONE, 0);
+ break;
+
+ case AF_INET6:
+ if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want6, a, sizeof(a)))
+ return;
+
+ if (a[RTA_DST])
+ net_fill_ip6(&dst, rta_get_ip6(a[RTA_DST]), i->rtm_dst_len);
+ else
+ net_fill_ip6(&dst, IP6_NONE, 0);
+
+ if (a[RTA_SRC])
+ net_fill_ip6(&src, rta_get_ip6(a[RTA_SRC]), i->rtm_src_len);
+ else
+ net_fill_ip6(&src, IP6_NONE, 0);
+ break;
+
+#ifdef HAVE_MPLS_KERNEL
+ case AF_MPLS:
+ if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want_mpls, a, sizeof(a)))
+ return;
+
+ if (!a[RTA_DST])
+ SKIP0("MPLS route without RTA_DST\n");
+
+ if (rta_get_mpls(a[RTA_DST], rta_mpls_stack) != 1)
+ SKIP0("MPLS route with multi-label RTA_DST\n");
+
+ net_fill_mpls(&dst, rta_mpls_stack[0]);
+ break;
+#endif
+
+ default:
+ return;
+ }
+
+ if (a[RTA_OIF])
+ oif = rta_get_u32(a[RTA_OIF]);
+
+ if (a[RTA_TABLE])
+ table_id = rta_get_u32(a[RTA_TABLE]);
+ 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)
+ SKIP("unknown table %u\n", table_id);
+
+ if (a[RTA_SRC] && (p->p.net_type != NET_IP6_SADR))
+ SKIP("src prefix for non-SADR channel\n");
+
+ if (a[RTA_IIF])
+ SKIP("IIF set\n");
+
+ if (i->rtm_tos != 0) /* We don't support TOS */
+ SKIP("TOS %02x\n", i->rtm_tos);
+
+ if (s->scan && !new)
+ SKIP("RTM_DELROUTE in scan\n");
+
+ if (a[RTA_PRIORITY])
+ priority = rta_get_u32(a[RTA_PRIORITY]);
+
+ int c = net_classify(&dst);
+ if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK))
+ SKIP("strange class/scope\n");
+
+ switch (i->rtm_protocol)
+ {
+ case RTPROT_UNSPEC:
+ SKIP("proto unspec\n");
+
+ case RTPROT_REDIRECT:
+ krt_src = KRT_SRC_REDIRECT;
+ break;
+
+ case RTPROT_KERNEL:
+ krt_src = KRT_SRC_KERNEL;
+ return;
+
+ case RTPROT_BIRD:
+ if (!s->scan)
+ SKIP("echo\n");
+ krt_src = KRT_SRC_BIRD;
+ break;
+
+ case RTPROT_BOOT:
+ default:
+ krt_src = KRT_SRC_ALIEN;
+ }
+
+ net_addr *n = &dst;
+ if (p->p.net_type == NET_IP6_SADR)
+ {
+ n = alloca(sizeof(net_addr_ip6_sadr));
+ net_fill_ip6_sadr(n, net6_prefix(&dst), net6_pxlen(&dst),
+ net6_prefix(&src), net6_pxlen(&src));
+ }
+
+ net *net = net_get(p->p.main_channel->table, n);
+
+ if (s->net && !nl_mergable_route(s, net, p, priority, i->rtm_type, i->rtm_family))
+ nl_announce_route(s);
+
+ rta *ra = lp_allocz(s->pool, RTA_MAX_SIZE);
+ ra->src = p->p.main_source;
+ ra->source = RTS_INHERIT;
+ ra->scope = SCOPE_UNIVERSE;
+
+ if (a[RTA_FLOW])
+ s->rta_flow = rta_get_u32(a[RTA_FLOW]);
+ else
+ s->rta_flow = 0;
+
+ switch (i->rtm_type)
+ {
+ case RTN_UNICAST:
+ ra->dest = RTD_UNICAST;
+
+ if (a[RTA_MULTIPATH])
+ {
+ struct nexthop *nh = nl_parse_multipath(s, p, n, a[RTA_MULTIPATH], i->rtm_family, krt_src);
+ if (!nh)
+ SKIP("strange RTA_MULTIPATH\n");
+
+ nexthop_link(ra, nh);
+ break;
+ }
+
+ 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)
+ {
+ log(L_ERR "KRT: Received route %N with unknown ifindex %u", net->n.addr, oif);
+ return;
+ }
+
+ if (a[RTA_GATEWAY])
+ ra->nh.gw = rta_get_ipa(a[RTA_GATEWAY]);
+
+#ifdef HAVE_MPLS_KERNEL
+ if (a[RTA_VIA])
+ ra->nh.gw = rta_get_via(a[RTA_VIA]);
+#endif
+
+ if (ipa_nonzero(ra->nh.gw))
+ {
+ /* Silently skip strange 6to4 routes */
+ const net_addr_ip6 sit = NET_ADDR_IP6(IP6_NONE, 96);
+ if ((i->rtm_family == AF_INET6) && ipa_in_netX(ra->nh.gw, (net_addr *) &sit))
+ return;
+
+ if (i->rtm_flags & RTNH_F_ONLINK)
+ ra->nh.flags |= RNF_ONLINK;
+
+ neighbor *nbr;
+ nbr = neigh_find(&p->p, ra->nh.gw, ra->nh.iface,
+ (ra->nh.flags & RNF_ONLINK) ? NEF_ONLINK : 0);
+ if (!nbr || (nbr->scope == SCOPE_HOST))
+ {
+ log(L_ERR "KRT: Received route %N with strange next-hop %I", net->n.addr,
+ ra->nh.gw);
+ return;
+ }
+ }
+
+ break;
+ case RTN_BLACKHOLE:
+ ra->dest = RTD_BLACKHOLE;
+ break;
+ case RTN_UNREACHABLE:
+ ra->dest = RTD_UNREACHABLE;
+ break;
+ case RTN_PROHIBIT:
+ ra->dest = RTD_PROHIBIT;
+ break;
+ /* FIXME: What about RTN_THROW? */
+ default:
+ SKIP("type %d\n", i->rtm_type);
+ return;
+ }
+
+#ifdef HAVE_MPLS_KERNEL
+ if ((i->rtm_family == AF_MPLS) && a[RTA_NEWDST] && !ra->nh.next)
+ ra->nh.labels = rta_get_mpls(a[RTA_NEWDST], ra->nh.label);
+
+ if (a[RTA_ENCAP] && a[RTA_ENCAP_TYPE] && !ra->nh.next)
+ {
+ switch (rta_get_u16(a[RTA_ENCAP_TYPE]))
+ {
+ case LWTUNNEL_ENCAP_MPLS:
+ {
+ struct rtattr *enca[BIRD_RTA_MAX];
+ nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]);
+ nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca));
+ ra->nh.labels = rta_get_mpls(enca[RTA_DST], ra->nh.label);
+ break;
+ }
+ default:
+ SKIP("unknown encapsulation method %d\n", rta_get_u16(a[RTA_ENCAP_TYPE]));
+ break;
+ }
+ }
+#endif
+
+ if (i->rtm_scope != def_scope)
+ {
+ ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr));
+ ea->next = ra->eattrs;
+ ra->eattrs = ea;
+ ea->flags = EALF_SORTED;
+ ea->count = 1;
+ ea->attrs[0].id = EA_KRT_SCOPE;
+ ea->attrs[0].flags = 0;
+ ea->attrs[0].type = EAF_TYPE_INT;
+ ea->attrs[0].u.data = i->rtm_scope;
+ }
+
+ if (a[RTA_PREFSRC])
+ {
+ ip_addr ps = rta_get_ipa(a[RTA_PREFSRC]);
+
+ ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr));
+ ea->next = ra->eattrs;
+ ra->eattrs = ea;
+ ea->flags = EALF_SORTED;
+ ea->count = 1;
+ ea->attrs[0].id = EA_KRT_PREFSRC;
+ ea->attrs[0].flags = 0;
+ ea->attrs[0].type = EAF_TYPE_IP_ADDRESS;
+
+ struct adata *ad = lp_alloc(s->pool, sizeof(struct adata) + sizeof(ps));
+ ad->length = sizeof(ps);
+ memcpy(ad->data, &ps, sizeof(ps));
+
+ ea->attrs[0].u.ptr = ad;
+ }
+
+ /* Can be set per-route or per-nexthop */
+ if (s->rta_flow)
+ {
+ ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr));
+ ea->next = ra->eattrs;
+ ra->eattrs = ea;
+ ea->flags = EALF_SORTED;
+ ea->count = 1;
+ ea->attrs[0].id = EA_KRT_REALM;
+ ea->attrs[0].flags = 0;
+ ea->attrs[0].type = EAF_TYPE_INT;
+ ea->attrs[0].u.data = s->rta_flow;
+ }
+
+ if (a[RTA_METRICS])
+ {
+ u32 metrics[KRT_METRICS_MAX];
+ ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + KRT_METRICS_MAX * sizeof(eattr));
+ int t, n = 0;
+
+ if (nl_parse_metrics(a[RTA_METRICS], metrics, ARRAY_SIZE(metrics)) < 0)
+ {
+ log(L_ERR "KRT: Received route %N with strange RTA_METRICS attribute", net->n.addr);
+ return;
+ }
+
+ for (t = 1; t < KRT_METRICS_MAX; t++)
+ if (metrics[0] & (1 << t))
+ {
+ ea->attrs[n].id = EA_CODE(PROTOCOL_KERNEL, KRT_METRICS_OFFSET + t);
+ ea->attrs[n].flags = 0;
+ ea->attrs[n].type = EAF_TYPE_INT; /* FIXME: Some are EAF_TYPE_BITFIELD */
+ ea->attrs[n].u.data = metrics[t];
+ n++;
+ }
+
+ if (n > 0)
+ {
+ ea->next = ra->eattrs;
+ ea->flags = EALF_SORTED;
+ ea->count = n;
+ ra->eattrs = ea;
+ }
+ }
+
+ /*
+ * Ideally, now we would send the received route to the rest of kernel code.
+ * But IPv6 ECMP routes before 4.11 are sent as a sequence of routes, so we
+ * postpone it and merge next hops until the end of the sequence. Note that
+ * when doing merging of next hops, we expect the new route to be unipath.
+ * Otherwise, we ignore additional next hops in nexthop_insert().
+ */
+
+ if (!s->net)
+ {
+ /* Store the new route */
+ s->net = net;
+ s->attrs = ra;
+ s->proto = p;
+ s->new = new;
+ s->krt_src = krt_src;
+ s->krt_type = i->rtm_type;
+ s->krt_proto = i->rtm_protocol;
+ s->krt_metric = priority;
+ }
+ else
+ {
+ /* Merge next hops with the stored route */
+ rta *oa = s->attrs;
+
+ struct nexthop *nhs = &oa->nh;
+ nexthop_insert(&nhs, &ra->nh);
+
+ /* Perhaps new nexthop is inserted at the first position */
+ if (nhs == &ra->nh)
+ {
+ /* Swap rtas */
+ s->attrs = ra;
+
+ /* Keep old eattrs */
+ ra->eattrs = oa->eattrs;
+ }
+ }
+}
+
+void
+krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NULL */
+{
+ struct nlmsghdr *h;
+ struct nl_parse_state s;
+
+ nl_parse_begin(&s, 1);
+ nl_request_dump(AF_UNSPEC, RTM_GETROUTE);
+ while (h = nl_get_scan())
+ if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
+ nl_parse_route(&s, h);
+ else
+ log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
+ nl_parse_end(&s);
+}
+
+/*
+ * Asynchronous Netlink interface
+ */
+
+static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */
+static byte *nl_async_rx_buffer; /* Receive buffer */
+
+static void
+nl_async_msg(struct nlmsghdr *h)
+{
+ struct nl_parse_state s;
+
+ switch (h->nlmsg_type)
+ {
+ case RTM_NEWROUTE:
+ case RTM_DELROUTE:
+ DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type);
+ nl_parse_begin(&s, 0);
+ nl_parse_route(&s, h);
+ nl_parse_end(&s);
+ break;
+ case RTM_NEWLINK:
+ case RTM_DELLINK:
+ DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type);
+ if (kif_proto)
+ nl_parse_link(h, 0);
+ break;
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type);
+ if (kif_proto)
+ nl_parse_addr(h, 0);
+ break;
+ default:
+ DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type);
+ }
+}
+
+static int
+nl_async_hook(sock *sk, uint size UNUSED)
+{
+ struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE };
+ struct sockaddr_nl sa;
+ struct msghdr m = {
+ .msg_name = &sa,
+ .msg_namelen = sizeof(sa),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ };
+ struct nlmsghdr *h;
+ int x;
+ uint len;
+
+ x = recvmsg(sk->fd, &m, 0);
+ if (x < 0)
+ {
+ if (errno == ENOBUFS)
+ {
+ /*
+ * Netlink reports some packets have been thrown away.
+ * One day we might react to it by asking for route table
+ * scan in near future.
+ */
+ log(L_WARN "Kernel dropped some netlink messages, will resync on next scan.");
+ return 1; /* More data are likely to be ready */
+ }
+ else if (errno != EWOULDBLOCK)
+ log(L_ERR "Netlink recvmsg: %m");
+ return 0;
+ }
+ if (sa.nl_pid) /* It isn't from the kernel */
+ {
+ DBG("Non-kernel packet\n");
+ return 1;
+ }
+ h = (void *) nl_async_rx_buffer;
+ len = x;
+ if (m.msg_flags & MSG_TRUNC)
+ {
+ log(L_WARN "Netlink got truncated asynchronous message");
+ return 1;
+ }
+ while (NLMSG_OK(h, len))
+ {
+ nl_async_msg(h);
+ h = NLMSG_NEXT(h, len);
+ }
+ if (len)
+ log(L_WARN "nl_async_hook: Found packet remnant of size %d", len);
+ return 1;
+}
+
+static void
+nl_async_err_hook(sock *sk, int e UNUSED)
+{
+ nl_async_hook(sk, 0);
+}
+
+static void
+nl_open_async(void)
+{
+ sock *sk;
+ struct sockaddr_nl sa;
+ int fd;
+
+ if (nl_async_sk)
+ return;
+
+ DBG("KRT: Opening async netlink socket\n");
+
+ fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (fd < 0)
+ {
+ log(L_ERR "Unable to open asynchronous rtnetlink socket: %m");
+ return;
+ }
+
+ bzero(&sa, sizeof(sa));
+ sa.nl_family = AF_NETLINK;
+ sa.nl_groups = RTMGRP_LINK |
+ RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE |
+ RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE;
+
+ if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0)
+ {
+ log(L_ERR "Unable to bind asynchronous rtnetlink socket: %m");
+ close(fd);
+ return;
+ }
+
+ nl_async_rx_buffer = xmalloc(NL_RX_SIZE);
+
+ sk = nl_async_sk = sk_new(krt_pool);
+ sk->type = SK_MAGIC;
+ sk->rx_hook = nl_async_hook;
+ sk->err_hook = nl_async_err_hook;
+ sk->fd = fd;
+ if (sk_open(sk) < 0)
+ bug("Netlink: sk_open failed");
+}
+
+
+/*
+ * Interface to the UNIX krt module
+ */
+
+void
+krt_sys_io_init(void)
+{
+ nl_linpool = lp_new_default(krt_pool);
+ HASH_INIT(nl_table_map, krt_pool, 6);
+}
+
+int
+krt_sys_start(struct krt_proto *p)
+{
+ struct krt_proto *old = HASH_FIND(nl_table_map, RTH, p->af, krt_table_id(p));
+
+ if (old)
+ {
+ log(L_ERR "%s: Kernel table %u already registered by %s",
+ p->p.name, krt_table_id(p), old->p.name);
+ return 0;
+ }
+
+ HASH_INSERT2(nl_table_map, RTH, krt_pool, p);
+
+ nl_open();
+ nl_open_async();
+
+ return 1;
+}
+
+void
+krt_sys_shutdown(struct krt_proto *p)
+{
+ 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)
+{
+ return (n->sys.table_id == o->sys.table_id) && (n->sys.metric == o->sys.metric);
+}
+
+void
+krt_sys_init_config(struct krt_config *cf)
+{
+ cf->sys.table_id = RT_TABLE_MAIN;
+ cf->sys.metric = 32;
+}
+
+void
+krt_sys_copy_config(struct krt_config *d, struct krt_config *s)
+{
+ d->sys.table_id = s->sys.table_id;
+ d->sys.metric = s->sys.metric;
+}
+
+static const char *krt_metrics_names[KRT_METRICS_MAX] = {
+ NULL, "lock", "mtu", "window", "rtt", "rttvar", "sstresh", "cwnd", "advmss",
+ "reordering", "hoplimit", "initcwnd", "features", "rto_min", "initrwnd", "quickack"
+};
+
+static const char *krt_features_names[KRT_FEATURES_MAX] = {
+ "ecn", NULL, NULL, "allfrag"
+};
+
+int
+krt_sys_get_attr(const eattr *a, byte *buf, int buflen UNUSED)
+{
+ switch (a->id)
+ {
+ case EA_KRT_PREFSRC:
+ bsprintf(buf, "prefsrc");
+ return GA_NAME;
+
+ case EA_KRT_REALM:
+ bsprintf(buf, "realm");
+ return GA_NAME;
+
+ case EA_KRT_SCOPE:
+ bsprintf(buf, "scope");
+ return GA_NAME;
+
+ case EA_KRT_LOCK:
+ buf += bsprintf(buf, "lock:");
+ ea_format_bitfield(a, buf, buflen, krt_metrics_names, 2, KRT_METRICS_MAX);
+ return GA_FULL;
+
+ case EA_KRT_FEATURES:
+ buf += bsprintf(buf, "features:");
+ ea_format_bitfield(a, buf, buflen, krt_features_names, 0, KRT_FEATURES_MAX);
+ return GA_FULL;
+
+ default:;
+ int id = (int)EA_ID(a->id) - KRT_METRICS_OFFSET;
+ if (id > 0 && id < KRT_METRICS_MAX)
+ {
+ bsprintf(buf, "%s", krt_metrics_names[id]);
+ return GA_NAME;
+ }
+
+ return GA_UNKNOWN;
+ }
+}
+
+
+
+void
+kif_sys_start(struct kif_proto *p UNUSED)
+{
+ nl_open();
+ nl_open_async();
+}
+
+void
+kif_sys_shutdown(struct kif_proto *p UNUSED)
+{
+}
+
+int
+kif_update_sysdep_addr(struct iface *i UNUSED)
+{
+ return 0;
+}
diff --git a/sysdep/linux/sysio.h b/sysdep/linux/sysio.h
index e21ff487..f13eda7c 100644
--- a/sysdep/linux/sysio.h
+++ b/sysdep/linux/sysio.h
@@ -10,6 +10,10 @@
#define IPV6_MINHOPCOUNT 73
#endif
+#ifndef IPV6_FREEBIND
+#define IPV6_FREEBIND 78
+#endif
+
#ifndef TCP_MD5SIG_EXT
#define TCP_MD5SIG_EXT 32
#endif
@@ -266,3 +270,18 @@ sk_set_priority(sock *s, int prio)
return 0;
}
+static inline int
+sk_set_freebind(sock *s)
+{
+ int y = 1;
+
+ if (sk_is_ipv4(s))
+ if (setsockopt(s->fd, SOL_IP, IP_FREEBIND, &y, sizeof(y)) < 0)
+ ERR("IP_FREEBIND");
+
+ if (sk_is_ipv6(s))
+ if (setsockopt(s->fd, SOL_IPV6, IPV6_FREEBIND, &y, sizeof(y)) < 0)
+ ERR("IPV6_FREEBIND");
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 07:17:56 +0000