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Although there are still heaps of FIXME's, Netlink works.

Browse Source 
To build BIRD with Netlink support, just configure it with

	./configure --with-sysconfig=linux-21

After it will be tested well enough, I'll probably make it a default
for 2.2 kernels (and rename it to linux-22 :)).
This commit is contained in:
Martin Mares 1999-03-04 14:23:32 +00:00
parent f81dc8564a
commit 2253c9e239
1 changed files with 126 additions and 24 deletions
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144
sysdep/linux/netlink/netlink.c
View File

@ -12,6 +12,7 @@
#include <net/if.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <errno.h>
#define LOCAL_DEBUG
@ -75,17 +76,15 @@ nl_open(void)
}
static void
nl_send(void *rq, int size)
nl_send(struct nlmsghdr *nh)
{
struct nlmsghdr *nh = rq;
struct sockaddr_nl sa;
memset(&sa, 0, sizeof(sa));
sa.nl_family = AF_NETLINK;
nh->nlmsg_len = size;
nh->nlmsg_pid = 0;
nh->nlmsg_seq = ++nl_sync_seq;
if (sendto(nl_sync_fd, rq, size, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0)
if (sendto(nl_sync_fd, nh, nh->nlmsg_len, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0)
die("rtnetlink sendto: %m");
nl_last_hdr = NULL;
}
@ -98,9 +97,10 @@ nl_request_dump(int cmd)
struct rtgenmsg g;
} req;
req.nh.nlmsg_type = cmd;
req.nh.nlmsg_len = sizeof(req);
req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
req.g.rtgen_family = PF_INET;
nl_send(&req, sizeof(req));
nl_send(&req.nh);
}
static struct nlmsghdr *
@ -144,14 +144,22 @@ nl_get_reply(void)
}
}
static char *
static int
nl_error(struct nlmsghdr *h)
{
struct nlmsgerr *e = NLMSG_DATA(h);
struct nlmsgerr *e;
int ec;
if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
return "Error message truncated";
else
return strerror(-e->error);
{
log(L_WARN "Netlink: Truncated error message received");
return ENOBUFS;
}
e = (struct nlmsgerr *) NLMSG_DATA(h);
ec = -e->error;
if (ec)
log(L_WARN "Netlink: %s", strerror(ec)); /* FIXME: Shut up? */
return ec;
}
static struct nlmsghdr *
@ -163,14 +171,30 @@ nl_get_scan(void)
return NULL;
if (h->nlmsg_type == NLMSG_ERROR)
{
log(L_ERR "Netlink error: %s", nl_error(h));
nl_error(h);
return NULL;
}
return h;
}
static int
nl_exchange(struct nlmsghdr *pkt)
{
struct nlmsghdr *h;
nl_send(pkt);
for(;;)
{
h = nl_get_reply();
if (h->nlmsg_type == NLMSG_ERROR)
break;
log(L_WARN "nl_exchange: Unexpected reply received");
}
return nl_error(h);
}
/*
* Parsing of Netlink attributes
* Netlink attributes
*/
static int nl_attr_len;
@ -207,6 +231,37 @@ nl_parse_attrs(struct rtattr *a, struct rtattr **k, int ksize)
return 1;
}
static void
nl_add_attr_u32(struct nlmsghdr *h, unsigned maxsize, int code, u32 data)
{
unsigned len = RTA_LENGTH(4);
struct rtattr *a;
if (NLMSG_ALIGN(h->nlmsg_len) + len > maxsize)
bug("nl_add_attr32: packet buffer overflow");
a = (struct rtattr *)((char *)h + NLMSG_ALIGN(h->nlmsg_len));
a->rta_type = code;
a->rta_len = len;
memcpy(RTA_DATA(a), &data, 4);
h->nlmsg_len = NLMSG_ALIGN(h->nlmsg_len) + len;
}
static void
nl_add_attr_ipa(struct nlmsghdr *h, unsigned maxsize, int code, ip_addr ipa)
{
unsigned len = RTA_LENGTH(sizeof(ipa));
struct rtattr *a;
if (NLMSG_ALIGN(h->nlmsg_len) + len > maxsize)
bug("nl_add_attr_ipa: packet buffer overflow");
a = (struct rtattr *)((char *)h + NLMSG_ALIGN(h->nlmsg_len));
a->rta_type = code;
a->rta_len = len;
ipa = ipa_hton(ipa);
memcpy(RTA_DATA(a), &ipa, sizeof(ipa));
h->nlmsg_len = NLMSG_ALIGN(h->nlmsg_len) + len;
}
/*
* Scanning of interfaces
*/
@ -390,25 +445,72 @@ krt_capable(rte *e)
}
static void
krt_delete(rte *e)
nl_send_route(rte *e, int new)
{
/* FIXME */
net *net = e->net;
rta *a = e->attrs;
struct {
struct nlmsghdr h;
struct rtmsg r;
char buf[128];
} r;
struct nlmsghdr *reply;
bzero(&r.h, sizeof(r.h));
bzero(&r.r, sizeof(r.r));
r.h.nlmsg_type = new ? RTM_NEWROUTE : RTM_DELROUTE;
r.h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
r.h.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | (new ? NLM_F_CREATE|NLM_F_REPLACE : 0);
/* FIXME: Do we really need to process ACKs? */
r.r.rtm_family = AF_INET;
r.r.rtm_dst_len = net->n.pxlen;
r.r.rtm_tos = 0; /* FIXME: Non-zero TOS? */
r.r.rtm_table = RT_TABLE_MAIN; /* FIXME: Other tables? */
r.r.rtm_protocol = RTPROT_BIRD;
r.r.rtm_scope = RT_SCOPE_UNIVERSE; /* FIXME: Other scopes? */
nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net->n.prefix);
switch (a->dest)
{
case RTD_ROUTER:
r.r.rtm_type = RTN_UNICAST;
nl_add_attr_ipa(&r.h, sizeof(r), RTA_GATEWAY, a->gw);
break;
case RTD_DEVICE:
r.r.rtm_type = RTN_UNICAST;
nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index);
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;
default:
bug("krt_capable inconsistent with nl_send_route");
}
static void
krt_insert(rte *e)
{
/* FIXME */
nl_exchange(&r.h);
}
void
krt_set_notify(struct proto *p, net *n, rte *new, rte *old)
{
/* FIXME: Use route updates if possible */
if (old && new && old->attrs->tos == new->attrs->tos)
{
/* FIXME: Priorities should be identical as well, but we don't use them yet. */
nl_send_route(new, 1);
}
else
{
if (old)
krt_delete(old);
nl_send_route(old, 0);
if (new)
krt_insert(new);
nl_send_route(new, 1);
}
}
struct iface *