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-rw-r--r--sysdep/linux/netlink/netlink.c144
1 files changed, 128 insertions, 16 deletions
diff --git a/sysdep/linux/netlink/netlink.c b/sysdep/linux/netlink/netlink.c
index e9b9886..64e3aa2 100644
--- a/sysdep/linux/netlink/netlink.c
+++ b/sysdep/linux/netlink/netlink.c
@@ -57,7 +57,7 @@ static int nl_sync_fd = -1; /* Unix socket for synchronous netlink actions */
static u32 nl_sync_seq; /* Sequence number of last request sent */
static byte *nl_rx_buffer; /* Receive buffer */
-static int nl_rx_size = 8192;
+#define NL_RX_SIZE 2048
static struct nlmsghdr *nl_last_hdr; /* Recently received packet */
static unsigned int nl_last_size;
@@ -71,7 +71,7 @@ nl_open(void)
if (nl_sync_fd < 0)
die("Unable to open rtnetlink socket: %m");
nl_sync_seq = now;
- nl_rx_buffer = xmalloc(nl_rx_size);
+ nl_rx_buffer = xmalloc(NL_RX_SIZE);
}
}
@@ -110,7 +110,7 @@ nl_get_reply(void)
{
if (!nl_last_hdr)
{
- struct iovec iov = { nl_rx_buffer, nl_rx_size };
+ struct iovec iov = { nl_rx_buffer, NL_RX_SIZE };
struct sockaddr_nl sa;
struct msghdr m = { (struct sockaddr *) &sa, sizeof(sa), &iov, 1, NULL, 0, 0 };
int x = recvmsg(nl_sync_fd, &m, 0);
@@ -456,6 +456,8 @@ nl_send_route(rte *e, int new)
} r;
struct nlmsghdr *reply;
+ DBG("nl_send_route(%I/%d,new=%d)\n", net->n.prefix, net->n.pxlen, new);
+
bzero(&r.h, sizeof(r.h));
bzero(&r.r, sizeof(r.r));
r.h.nlmsg_type = new ? RTM_NEWROUTE : RTM_DELROUTE;
@@ -499,6 +501,10 @@ nl_send_route(rte *e, int new)
void
krt_set_notify(struct proto *p, net *n, rte *new, rte *old)
{
+ if (old && old->attrs->source == RTS_DEVICE) /* Device routes are left to the kernel */
+ old = NULL;
+ if (new && new->attrs->source == RTS_DEVICE)
+ new = NULL;
if (old && new && old->attrs->tos == new->attrs->tos)
{
/* FIXME: Priorities should be identical as well, but we don't use them yet. */
@@ -507,7 +513,11 @@ krt_set_notify(struct proto *p, net *n, rte *new, rte *old)
else
{
if (old)
- nl_send_route(old, 0);
+ {
+ if (!old->attrs->iface || (old->attrs->iface->flags & IF_UP))
+ nl_send_route(old, 0);
+ /* else the kernel has already flushed it */
+ }
if (new)
nl_send_route(new, 1);
}
@@ -542,6 +552,7 @@ nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
rte *e;
net *net;
u32 oif;
+ int src;
if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(RTM_RTA(i), a, sizeof(a)))
return;
@@ -559,7 +570,8 @@ nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
return;
if (i->rtm_tos != 0) /* FIXME: What about TOS? */
return;
- if (!new)
+
+ if (scan && !new)
{
DBG("KRT: Ignoring route deletion\n");
return;
@@ -579,6 +591,26 @@ nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
DBG("Got %I/%d, type=%d, oif=%d\n", dst, i->rtm_dst_len, i->rtm_type, oif);
+ switch (i->rtm_protocol)
+ {
+ case RTPROT_REDIRECT:
+ src = KRT_SRC_REDIRECT;
+ break;
+ case RTPROT_KERNEL:
+ DBG("Route originated in kernel, ignoring\n");
+ return;
+ case RTPROT_BIRD:
+ if (!scan)
+ {
+ DBG("Echo of our own route, ignoring\n");
+ return;
+ }
+ src = KRT_SRC_BIRD;
+ break;
+ default:
+ src = KRT_SRC_ALIEN;
+ }
+
net = net_get(&master_table, 0, dst, i->rtm_dst_len);
ra.proto = &p->p;
ra.source = RTS_INHERIT;
@@ -633,7 +665,11 @@ nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
}
e = rte_get_temp(&ra);
e->net = net;
- krt_got_route(p, e);
+ e->u.krt_sync.src = src;
+ if (scan)
+ krt_got_route(p, e);
+ else
+ krt_got_route_async(p, e, new);
}
void
@@ -654,12 +690,72 @@ krt_scan_fire(struct krt_proto *p)
*/
static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */
+static byte *nl_async_rx_buffer; /* Receive buffer */
+
+static void
+nl_async_msg(struct krt_proto *p, struct nlmsghdr *h)
+{
+ switch (h->nlmsg_type)
+ {
+ case RTM_NEWROUTE:
+ case RTM_DELROUTE:
+ DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type);
+ nl_parse_route(p, h, 0);
+ break;
+ case RTM_NEWLINK:
+ case RTM_DELLINK:
+ DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type);
+ nl_parse_link(h, 0);
+ break;
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type);
+ nl_parse_addr(h);
+ break;
+ default:
+ DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type);
+ }
+}
static int
nl_async_hook(sock *sk, int size)
{
- DBG("nl_async_hook\n");
- return 0;
+ struct krt_proto *p = sk->data;
+ struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE };
+ struct sockaddr_nl sa;
+ struct msghdr m = { (struct sockaddr *) &sa, sizeof(sa), &iov, 1, NULL, 0, 0 };
+ struct nlmsghdr *h;
+ int x;
+ unsigned int len;
+
+ nl_last_hdr = NULL; /* Discard packets accidentally remaining in the rxbuf */
+ x = recvmsg(sk->fd, &m, 0);
+ if (x < 0)
+ {
+ 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(p, 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
@@ -667,21 +763,36 @@ nl_open_async(struct krt_proto *p)
{
sock *sk;
struct sockaddr_nl sa;
+ int fd;
DBG("KRT: Opening async netlink socket\n");
- sk = nl_async_sk = sk_new(p->p.pool);
- sk->type = SK_MAGIC;
- sk->rx_hook = nl_async_hook;
- sk->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
- if (sk->fd < 0 || sk_open(sk))
- die("Unable to open secondary rtnetlink socket: %m");
+ fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (fd < 0)
+ {
+ log(L_ERR "Unable to open secondary rtnetlink socket: %m");
+ return;
+ }
bzero(&sa, sizeof(sa));
sa.nl_family = AF_NETLINK;
sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE;
- if (bind(sk->fd, (struct sockaddr *) &sa, sizeof(sa)) < 0)
- die("Unable to bind secondary rtnetlink socket: %m");
+ if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0)
+ {
+ log(L_ERR "Unable to bind secondary rtnetlink socket: %m");
+ return;
+ }
+
+ sk = nl_async_sk = sk_new(p->p.pool);
+ sk->type = SK_MAGIC;
+ sk->data = p;
+ sk->rx_hook = nl_async_hook;
+ sk->fd = fd;
+ if (sk_open(sk))
+ bug("Netlink: sk_open failed");
+
+ if (!nl_async_rx_buffer)
+ nl_async_rx_buffer = xmalloc(NL_RX_SIZE);
}
/*
@@ -692,6 +803,7 @@ void
krt_scan_preconfig(struct krt_config *x)
{
x->scan.async = 1;
+ /* FIXME: Use larger defaults for scanning times? */
}
void
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 05:31:42 +0100