summaryrefslogtreecommitdiffstats
path: root/sysdep/linux/netlink/krt.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdep/linux/netlink/krt.c')
-rw-r--r--sysdep/linux/netlink/krt.c447
1 files changed, 0 insertions, 447 deletions
diff --git a/sysdep/linux/netlink/krt.c b/sysdep/linux/netlink/krt.c
deleted file mode 100644
index c399e20..0000000
--- a/sysdep/linux/netlink/krt.c
+++ /dev/null
@@ -1,447 +0,0 @@
-/*
- * BIRD -- Linux Netlink Interface
- *
- * (c) 1999 Martin Mares <mj@ucw.cz>
- *
- * Can be freely distributed and used under the terms of the GNU GPL.
- */
-
-#include <string.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <net/if.h>
-#include <sys/socket.h>
-#include <sys/uio.h>
-
-#define LOCAL_DEBUG
-
-#undef ASYNC_NETLINK /* Define if async notifications should be used (debug) */
-
-#include "nest/bird.h"
-#include "nest/route.h"
-#include "nest/protocol.h"
-#include "nest/iface.h"
-#include "lib/timer.h"
-#include "lib/unix.h"
-#include "lib/krt.h"
-#include "lib/socket.h"
-
-/*
- * We need to work around namespace conflicts between us and the kernel,
- * but I prefer this way to being forced to rename our configuration symbols.
- * This will disappear as soon as netlink headers become part of the libc.
- */
-
-#undef CONFIG_NETLINK
-#include <linux/config.h>
-#ifndef CONFIG_NETLINK
-#error "Kernel not configured to support netlink"
-#endif
-
-#include <asm/types.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-
-#ifndef MSG_TRUNC /* FIXME: Hack to circumvent omissions in glibc includes */
-#define MSG_TRUNC 0x20
-#endif
-
-struct proto_config *cf_krt;
-
-/*
- * Synchronous Netlink interface
- */
-
-static int nl_sync_fd; /* 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;
-
-static struct nlmsghdr *nl_last_hdr; /* Recently received packet */
-static unsigned int nl_last_size;
-
-static void
-nl_send(void *rq, int size)
-{
- 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)
- die("rtnetlink sendto: %m");
- nl_last_hdr = NULL;
-}
-
-static void
-nl_request_dump(int cmd)
-{
- struct {
- struct nlmsghdr nh;
- struct rtgenmsg g;
- } req;
- req.nh.nlmsg_type = cmd;
- req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
- req.g.rtgen_family = PF_INET;
- nl_send(&req, sizeof(req));
-}
-
-static struct nlmsghdr *
-nl_get_reply(void)
-{
- for(;;)
- {
- if (!nl_last_hdr)
- {
- 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);
- 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;
- if (h->nlmsg_seq != nl_sync_seq)
- {
- log(L_WARN "nl_get_reply: Ignoring out of sequence netlink packet (%x != %x)",
- h->nlmsg_seq, nl_sync_seq);
- continue;
- }
- nl_last_hdr = NLMSG_NEXT(h, nl_last_size);
- 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 char *
-nl_error(struct nlmsghdr *h)
-{
- struct nlmsgerr *e = NLMSG_DATA(h);
- if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
- return "Error message truncated";
- else
- return strerror(-e->error);
-}
-
-static struct nlmsghdr *
-nl_get_scan(void)
-{
- struct nlmsghdr *h = nl_get_reply();
-
- if (h->nlmsg_type == NLMSG_DONE)
- return NULL;
- if (h->nlmsg_type == NLMSG_ERROR)
- {
- log(L_ERR "Netlink error: %s", nl_error(h));
- return NULL;
- }
- return h;
-}
-
-/*
- * Parsing of 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);
-}
-
-static int
-nl_parse_attrs(struct rtattr *a, struct rtattr **k, int ksize)
-{
- int max = ksize / sizeof(struct rtattr *);
- bzero(k, ksize);
- while (RTA_OK(a, nl_attr_len))
- {
- if (a->rta_type < max)
- k[a->rta_type] = a;
- a = RTA_NEXT(a, nl_attr_len);
- }
- if (nl_attr_len)
- {
- log(L_ERR "nl_parse_attrs: remnant of size %d", nl_attr_len);
- return 0;
- }
- else
- return 1;
-}
-
-/*
- * Scanning of interfaces
- */
-
-static void
-nl_parse_link(struct nlmsghdr *h, int scan)
-{
- struct ifinfomsg *i;
- struct rtattr *a[IFLA_STATS+1];
- int new = h->nlmsg_type == RTM_NEWLINK;
- struct iface f;
- struct iface *ifi;
- char *name;
- u32 mtu;
- unsigned int fl;
-
- if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFLA_RTA(i), a, sizeof(a)))
- return;
- if (!a[IFLA_IFNAME] || RTA_PAYLOAD(a[IFLA_IFNAME]) < 2 ||
- !a[IFLA_MTU] || RTA_PAYLOAD(a[IFLA_MTU]) != 4)
- {
- log(L_ERR "nl_parse_link: Malformed message received");
- return;
- }
- name = RTA_DATA(a[IFLA_IFNAME]);
- memcpy(&mtu, RTA_DATA(a[IFLA_MTU]), sizeof(u32));
-
- ifi = if_find_by_index(i->ifi_index);
- if (!new)
- {
- DBG("KRT: IF%d(%s) goes down\n", i->ifi_index, name);
- if (ifi && !scan)
- {
- memcpy(&f, ifi, sizeof(struct iface));
- f.flags |= IF_ADMIN_DOWN;
- if_update(&f);
- }
- }
- else
- {
- DBG("KRT: IF%d(%s) goes up (mtu=%d,flg=%x)\n", i->ifi_index, name, mtu, i->ifi_flags);
- if (ifi)
- memcpy(&f, ifi, sizeof(f));
- else
- {
- bzero(&f, sizeof(f));
- f.index = i->ifi_index;
- }
- strncpy(f.name, RTA_DATA(a[IFLA_IFNAME]), sizeof(f.name)-1);
- f.mtu = mtu;
- f.flags = 0;
- fl = i->ifi_flags;
- if (fl & IFF_UP)
- f.flags |= IF_LINK_UP;
- if (fl & IFF_POINTOPOINT)
- f.flags |= IF_UNNUMBERED | IF_MULTICAST;
- if (fl & IFF_LOOPBACK)
- f.flags |= IF_LOOPBACK | IF_IGNORE;
- if (fl & IFF_BROADCAST)
- f.flags |= IF_BROADCAST | IF_MULTICAST;
- if_update(&f);
- }
-}
-
-static void
-nl_parse_addr(struct nlmsghdr *h)
-{
- struct ifaddrmsg *i;
- struct rtattr *a[IFA_ANYCAST+1];
- int new = h->nlmsg_type == RTM_NEWADDR;
- struct iface f;
- struct iface *ifi;
-
- if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFA_RTA(i), a, sizeof(a)))
- return;
- if (i->ifa_family != AF_INET)
- return;
- if (!a[IFA_ADDRESS] || RTA_PAYLOAD(a[IFA_ADDRESS]) != 4 ||
- !a[IFA_LOCAL] || RTA_PAYLOAD(a[IFA_LOCAL]) != 4 ||
- (a[IFA_BROADCAST] && RTA_PAYLOAD(a[IFA_BROADCAST]) != 4))
- {
- log(L_ERR "nl_parse_addr: Malformed message received");
- return;
- }
- if (i->ifa_flags & IFA_F_SECONDARY)
- {
- DBG("KRT: Received address message for secondary address which is not supported.\n"); /* FIXME */
- return;
- }
-
- ifi = if_find_by_index(i->ifa_index);
- if (!ifi)
- {
- log(L_ERR "KRT: Received address message for unknown interface %d\n", i->ifa_index);
- return;
- }
- memcpy(&f, ifi, sizeof(f));
-
- if (i->ifa_prefixlen > 32 || i->ifa_prefixlen == 31 ||
- (f.flags & IF_UNNUMBERED) && i->ifa_prefixlen != 32)
- {
- log(L_ERR "KRT: Invalid prefix length for interface %s: %d\n", f.name, i->ifa_prefixlen);
- new = 0;
- }
-
- f.ip = f.brd = f.opposite = IPA_NONE;
- if (!new)
- {
- DBG("KRT: IF%d IP address deleted\n");
- f.pxlen = 0;
- }
- else
- {
- memcpy(&f.ip, RTA_DATA(a[IFA_LOCAL]), sizeof(f.ip));
- f.ip = ipa_ntoh(f.ip);
- f.pxlen = i->ifa_prefixlen;
- if (f.flags & IF_UNNUMBERED)
- {
- memcpy(&f.opposite, RTA_DATA(a[IFA_ADDRESS]), sizeof(f.opposite));
- f.opposite = f.brd = ipa_ntoh(f.opposite);
- }
- else if ((f.flags & IF_BROADCAST) && a[IFA_BROADCAST])
- {
- memcpy(&f.brd, RTA_DATA(a[IFA_BROADCAST]), sizeof(f.brd));
- f.brd = ipa_ntoh(f.brd);
- }
- /* else a NBMA link */
- f.prefix = ipa_and(f.ip, ipa_mkmask(f.pxlen));
- DBG("KRT: IF%d IP address set to %I, net %I/%d, brd %I, opp %I\n", f.index, f.ip, f.prefix, f.pxlen, f.brd, f.opposite);
- }
- if_update(&f);
-}
-
-static void
-nl_scan_ifaces(void)
-{
- struct nlmsghdr *h;
-
- if_start_update();
-
- nl_request_dump(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);
-
- nl_request_dump(RTM_GETADDR);
- while (h = nl_get_scan())
- if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR)
- nl_parse_addr(h);
- else
- log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type);
-
- if_end_update();
-}
-
-/*
- * Asynchronous Netlink interface
- */
-
-static sock *nl_async_sk; /* BIRD socket for asynchronous notifications */
-
-static int
-nl_async_hook(sock *sk, int size)
-{
- DBG("nl_async_hook\n");
- return 0;
-}
-
-/*
- * Protocol core
- */
-
-static void
-krt_preconfig(struct protocol *x, struct config *c)
-{
- struct krt_config *z = proto_config_new(&proto_unix_kernel, sizeof(struct krt_config));
-
- cf_krt = &z->c;
- z->c.preference = DEF_PREF_UKR;
-}
-
-static struct proto *
-krt_init(struct proto_config *c)
-{
- struct krt_proto *p = proto_new(c, sizeof(struct krt_proto));
-
- return &p->p;
-}
-
-static void
-nl_open_async(struct proto *p)
-{
- sock *sk;
- struct sockaddr_nl sa;
-
- sk = nl_async_sk = sk_new(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");
-
- 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");
-}
-
-static int
-krt_start(struct proto *p)
-{
-#ifdef ASYNC_NETLINK
- nl_open_async(p);
-#endif
-
- /* FIXME: Filter kernel routing table etc. */
-
- return PS_UP;
-}
-
-static int
-krt_shutdown(struct proto *p)
-{
- /* FIXME: Remove all our routes from the kernel */
-
- return PS_DOWN;
-}
-
-void
-scan_if_init(void)
-{
- nl_sync_fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
- if (nl_sync_fd < 0)
- die("Unable to open rtnetlink socket: %m");
- nl_sync_seq = now;
- nl_rx_buffer = xmalloc(nl_rx_size);
- /* FIXME: Should we fetch our local address and compare it with addresses of all incoming messages? */
-
- nl_scan_ifaces();
-}
-
-struct protocol proto_unix_kernel = {
- name: "Kernel",
- preconfig: krt_preconfig,
- init: krt_init,
- start: krt_start,
- shutdown: krt_shutdown
-};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 11:47:49 +0100