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Diffstat (limited to 'pfinet/linux-src/net/core/rtnetlink.c')
-rw-r--r--pfinet/linux-src/net/core/rtnetlink.c512
1 files changed, 512 insertions, 0 deletions
diff --git a/pfinet/linux-src/net/core/rtnetlink.c b/pfinet/linux-src/net/core/rtnetlink.c
new file mode 100644
index 00000000..7f89e54a
--- /dev/null
+++ b/pfinet/linux-src/net/core/rtnetlink.c
@@ -0,0 +1,512 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Routing netlink socket interface: protocol independent part.
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Fixes:
+ * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
+ * Alexey Zhuravlev ifi_change does something useful
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/capability.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/string.h>
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/arp.h>
+#include <net/route.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+
+atomic_t rtnl_rlockct;
+struct wait_queue *rtnl_wait;
+
+
+void rtnl_lock()
+{
+ rtnl_shlock();
+ rtnl_exlock();
+}
+
+void rtnl_unlock()
+{
+ rtnl_exunlock();
+ rtnl_shunlock();
+}
+
+int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
+{
+ memset(tb, 0, sizeof(struct rtattr*)*maxattr);
+
+ while (RTA_OK(rta, len)) {
+ unsigned flavor = rta->rta_type;
+ if (flavor && flavor <= maxattr)
+ tb[flavor-1] = rta;
+ rta = RTA_NEXT(rta, len);
+ }
+ return 0;
+}
+
+#ifdef CONFIG_RTNETLINK
+struct sock *rtnl;
+
+unsigned long rtnl_wlockct;
+
+struct rtnetlink_link * rtnetlink_links[NPROTO];
+
+#define _S 1 /* superuser privileges required */
+#define _X 2 /* exclusive access to tables required */
+#define _G 4 /* GET request */
+
+static const int rtm_min[(RTM_MAX+1-RTM_BASE)/4] =
+{
+ NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+ NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
+ NLMSG_LENGTH(sizeof(struct rtmsg)),
+ NLMSG_LENGTH(sizeof(struct ndmsg)),
+ NLMSG_LENGTH(sizeof(struct rtmsg)),
+ NLMSG_LENGTH(sizeof(struct tcmsg)),
+ NLMSG_LENGTH(sizeof(struct tcmsg)),
+ NLMSG_LENGTH(sizeof(struct tcmsg))
+};
+
+static const int rta_max[(RTM_MAX+1-RTM_BASE)/4] =
+{
+ IFLA_MAX,
+ IFA_MAX,
+ RTA_MAX,
+ NDA_MAX,
+ RTA_MAX,
+ TCA_MAX,
+ TCA_MAX,
+ TCA_MAX
+};
+
+void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
+{
+ struct rtattr *rta;
+ int size = RTA_LENGTH(attrlen);
+
+ rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
+ rta->rta_type = attrtype;
+ rta->rta_len = size;
+ memcpy(RTA_DATA(rta), data, attrlen);
+}
+
+int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
+{
+ int err = 0;
+
+ NETLINK_CB(skb).dst_groups = group;
+ if (echo)
+ atomic_inc(&skb->users);
+ netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
+ if (echo)
+ err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
+ return err;
+}
+
+static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct device *dev,
+ int type, u32 pid, u32 seq, u32 change)
+{
+ struct ifinfomsg *r;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+
+ nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*r));
+ if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
+ r = NLMSG_DATA(nlh);
+ r->ifi_family = AF_UNSPEC;
+ r->ifi_type = dev->type;
+ r->ifi_index = dev->ifindex;
+ r->ifi_flags = dev->flags;
+ r->ifi_change = change;
+
+ RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
+ if (dev->addr_len) {
+ RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
+ RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
+ }
+ if (1) {
+ unsigned mtu = dev->mtu;
+ RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
+ }
+ if (dev->ifindex != dev->iflink)
+ RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
+ if (dev->qdisc_sleeping)
+ RTA_PUT(skb, IFLA_QDISC,
+ strlen(dev->qdisc_sleeping->ops->id) + 1,
+ dev->qdisc_sleeping->ops->id);
+ if (dev->get_stats) {
+ struct net_device_stats *stats = dev->get_stats(dev);
+ if (stats)
+ RTA_PUT(skb, IFLA_STATS, sizeof(*stats), stats);
+ }
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int idx;
+ int s_idx = cb->args[0];
+ struct device *dev;
+
+ for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
+ if (idx < s_idx)
+ continue;
+ if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 0) <= 0)
+ break;
+ }
+ cb->args[0] = idx;
+
+ return skb->len;
+}
+
+int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int idx;
+ int s_idx = cb->family;
+
+ if (s_idx == 0)
+ s_idx = 1;
+ for (idx=1; idx<NPROTO; idx++) {
+ int type = cb->nlh->nlmsg_type-RTM_BASE;
+ if (idx < s_idx || idx == PF_PACKET)
+ continue;
+ if (rtnetlink_links[idx] == NULL ||
+ rtnetlink_links[idx][type].dumpit == NULL)
+ continue;
+ if (idx > s_idx)
+ memset(&cb->args[0], 0, sizeof(cb->args));
+ if (rtnetlink_links[idx][type].dumpit(skb, cb) == 0)
+ continue;
+ if (skb_tailroom(skb) < 256)
+ break;
+ }
+ cb->family = idx;
+
+ return skb->len;
+}
+
+void rtmsg_ifinfo(int type, struct device *dev)
+{
+ struct sk_buff *skb;
+ int size = NLMSG_GOODSIZE;
+
+ skb = alloc_skb(size, GFP_KERNEL);
+ if (!skb)
+ return;
+
+ if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, ~0U) < 0) {
+ kfree_skb(skb);
+ return;
+ }
+ NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
+ netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_KERNEL);
+}
+
+static int rtnetlink_done(struct netlink_callback *cb)
+{
+ if (cap_raised(NETLINK_CB(cb->skb).eff_cap, CAP_NET_ADMIN) && cb->nlh->nlmsg_flags&NLM_F_ATOMIC)
+ rtnl_shunlock();
+ return 0;
+}
+
+/* Process one rtnetlink message. */
+
+extern __inline__ int
+rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
+{
+ struct rtnetlink_link *link;
+ struct rtnetlink_link *link_tab;
+ struct rtattr *rta[RTATTR_MAX];
+
+ int exclusive = 0;
+ int sz_idx, kind;
+ int min_len;
+ int family;
+ int type;
+ int err;
+
+ /* Only requests are handled by kernel now */
+ if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
+ return 0;
+
+ type = nlh->nlmsg_type;
+
+ /* A control message: ignore them */
+ if (type < RTM_BASE)
+ return 0;
+
+ /* Unknown message: reply with EINVAL */
+ if (type > RTM_MAX)
+ goto err_inval;
+
+ type -= RTM_BASE;
+
+ /* All the messages must have at least 1 byte length */
+ if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
+ return 0;
+
+ family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
+ if (family > NPROTO) {
+ *errp = -EAFNOSUPPORT;
+ return -1;
+ }
+
+ link_tab = rtnetlink_links[family];
+ if (link_tab == NULL)
+ link_tab = rtnetlink_links[PF_UNSPEC];
+ link = &link_tab[type];
+
+ sz_idx = type>>2;
+ kind = type&3;
+
+ if (kind != 2 && !cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN)) {
+ *errp = -EPERM;
+ return -1;
+ }
+
+ if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
+ u32 rlen;
+
+ if (link->dumpit == NULL)
+ link = &(rtnetlink_links[PF_UNSPEC][type]);
+
+ if (link->dumpit == NULL)
+ goto err_inval;
+
+ /* Super-user locks all the tables to get atomic snapshot */
+ if (cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN)
+ && nlh->nlmsg_flags&NLM_F_ATOMIC)
+ atomic_inc(&rtnl_rlockct);
+ if ((*errp = netlink_dump_start(rtnl, skb, nlh,
+ link->dumpit,
+ rtnetlink_done)) != 0) {
+ if (cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN) && nlh->nlmsg_flags&NLM_F_ATOMIC)
+ atomic_dec(&rtnl_rlockct);
+ return -1;
+ }
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+ skb_pull(skb, rlen);
+ return -1;
+ }
+
+ if (kind != 2) {
+ if (rtnl_exlock_nowait()) {
+ *errp = 0;
+ return -1;
+ }
+ exclusive = 1;
+ }
+
+ memset(&rta, 0, sizeof(rta));
+
+ min_len = rtm_min[sz_idx];
+ if (nlh->nlmsg_len < min_len)
+ goto err_inval;
+
+ if (nlh->nlmsg_len > min_len) {
+ int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
+ struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
+
+ while (RTA_OK(attr, attrlen)) {
+ unsigned flavor = attr->rta_type;
+ if (flavor) {
+ if (flavor > rta_max[sz_idx])
+ goto err_inval;
+ rta[flavor-1] = attr;
+ }
+ attr = RTA_NEXT(attr, attrlen);
+ }
+ }
+
+ if (link->doit == NULL)
+ link = &(rtnetlink_links[PF_UNSPEC][type]);
+ if (link->doit == NULL)
+ goto err_inval;
+ err = link->doit(skb, nlh, (void *)&rta);
+
+ if (exclusive)
+ rtnl_exunlock();
+ *errp = err;
+ return err;
+
+err_inval:
+ if (exclusive)
+ rtnl_exunlock();
+ *errp = -EINVAL;
+ return -1;
+}
+
+/*
+ * Process one packet of messages.
+ * Malformed skbs with wrong lengths of messages are discarded silently.
+ */
+
+extern __inline__ int rtnetlink_rcv_skb(struct sk_buff *skb)
+{
+ int err;
+ struct nlmsghdr * nlh;
+
+ while (skb->len >= NLMSG_SPACE(0)) {
+ u32 rlen;
+
+ nlh = (struct nlmsghdr *)skb->data;
+ if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
+ return 0;
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+ if (rtnetlink_rcv_msg(skb, nlh, &err)) {
+ /* Not error, but we must interrupt processing here:
+ * Note, that in this case we do not pull message
+ * from skb, it will be processed later.
+ */
+ if (err == 0)
+ return -1;
+ netlink_ack(skb, nlh, err);
+ } else if (nlh->nlmsg_flags&NLM_F_ACK)
+ netlink_ack(skb, nlh, 0);
+ skb_pull(skb, rlen);
+ }
+
+ return 0;
+}
+
+/*
+ * rtnetlink input queue processing routine:
+ * - try to acquire shared lock. If it is failed, defer processing.
+ * - feed skbs to rtnetlink_rcv_skb, until it refuse a message,
+ * that will occur, when a dump started and/or acquisition of
+ * exclusive lock failed.
+ */
+
+static void rtnetlink_rcv(struct sock *sk, int len)
+{
+ struct sk_buff *skb;
+
+ if (rtnl_shlock_nowait())
+ return;
+
+ while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
+ if (rtnetlink_rcv_skb(skb)) {
+ if (skb->len)
+ skb_queue_head(&sk->receive_queue, skb);
+ else
+ kfree_skb(skb);
+ break;
+ }
+ kfree_skb(skb);
+ }
+
+ rtnl_shunlock();
+}
+
+static struct rtnetlink_link link_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
+{
+ { NULL, NULL, },
+ { NULL, NULL, },
+ { NULL, rtnetlink_dump_ifinfo, },
+ { NULL, NULL, },
+
+ { NULL, NULL, },
+ { NULL, NULL, },
+ { NULL, rtnetlink_dump_all, },
+ { NULL, NULL, },
+
+ { NULL, NULL, },
+ { NULL, NULL, },
+ { NULL, rtnetlink_dump_all, },
+ { NULL, NULL, },
+
+ { neigh_add, NULL, },
+ { neigh_delete, NULL, },
+ { NULL, neigh_dump_info, },
+ { NULL, NULL, },
+
+ { NULL, NULL, },
+ { NULL, NULL, },
+ { NULL, NULL, },
+ { NULL, NULL, },
+};
+
+
+static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ struct device *dev = ptr;
+ switch (event) {
+ case NETDEV_UNREGISTER:
+ rtmsg_ifinfo(RTM_DELLINK, dev);
+ break;
+ default:
+ rtmsg_ifinfo(RTM_NEWLINK, dev);
+ break;
+ }
+ return NOTIFY_DONE;
+}
+
+struct notifier_block rtnetlink_dev_notifier = {
+ rtnetlink_event,
+ NULL,
+ 0
+};
+
+
+__initfunc(void rtnetlink_init(void))
+{
+#ifdef RTNL_DEBUG
+ printk("Initializing RT netlink socket\n");
+#endif
+ rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv);
+ if (rtnl == NULL)
+ panic("rtnetlink_init: cannot initialize rtnetlink\n");
+ register_netdevice_notifier(&rtnetlink_dev_notifier);
+ rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
+ rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
+}
+
+
+
+#endif
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