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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/decnet/dn_rules.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/decnet/dn_rules.c')
-rw-r--r--net/decnet/dn_rules.c416
1 files changed, 416 insertions, 0 deletions
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
new file mode 100644
index 00000000000..597587d170d
--- /dev/null
+++ b/net/decnet/dn_rules.c
@@ -0,0 +1,416 @@
+
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Routing Forwarding Information Base (Rules)
+ *
+ * Author: Steve Whitehouse <SteveW@ACM.org>
+ * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
+ *
+ *
+ * Changes:
+ *
+ */
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/netdevice.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include <linux/in_route.h>
+#include <asm/atomic.h>
+#include <asm/uaccess.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+#include <net/dn_dev.h>
+
+struct dn_fib_rule
+{
+ struct dn_fib_rule *r_next;
+ atomic_t r_clntref;
+ u32 r_preference;
+ unsigned char r_table;
+ unsigned char r_action;
+ unsigned char r_dst_len;
+ unsigned char r_src_len;
+ dn_address r_src;
+ dn_address r_srcmask;
+ dn_address r_dst;
+ dn_address r_dstmask;
+ dn_address r_srcmap;
+ u8 r_flags;
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ u32 r_fwmark;
+#endif
+ int r_ifindex;
+ char r_ifname[IFNAMSIZ];
+ int r_dead;
+};
+
+static struct dn_fib_rule default_rule = {
+ .r_clntref = ATOMIC_INIT(2),
+ .r_preference = 0x7fff,
+ .r_table = RT_TABLE_MAIN,
+ .r_action = RTN_UNICAST
+};
+
+static struct dn_fib_rule *dn_fib_rules = &default_rule;
+static DEFINE_RWLOCK(dn_fib_rules_lock);
+
+
+int dn_fib_rtm_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct rtmsg *rtm = NLMSG_DATA(nlh);
+ struct dn_fib_rule *r, **rp;
+ int err = -ESRCH;
+
+ for(rp=&dn_fib_rules; (r=*rp) != NULL; rp = &r->r_next) {
+ if ((!rta[RTA_SRC-1] || memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 2) == 0) &&
+ rtm->rtm_src_len == r->r_src_len &&
+ rtm->rtm_dst_len == r->r_dst_len &&
+ (!rta[RTA_DST-1] || memcmp(RTA_DATA(rta[RTA_DST-1]), &r->r_dst, 2) == 0) &&
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ (!rta[RTA_PROTOINFO-1] || memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
+#endif
+ (!rtm->rtm_type || rtm->rtm_type == r->r_action) &&
+ (!rta[RTA_PRIORITY-1] || memcmp(RTA_DATA(rta[RTA_PRIORITY-1]), &r->r_preference, 4) == 0) &&
+ (!rta[RTA_IIF-1] || rtattr_strcmp(rta[RTA_IIF-1], r->r_ifname) == 0) &&
+ (!rtm->rtm_table || (r && rtm->rtm_table == r->r_table))) {
+
+ err = -EPERM;
+ if (r == &default_rule)
+ break;
+
+ write_lock_bh(&dn_fib_rules_lock);
+ *rp = r->r_next;
+ r->r_dead = 1;
+ write_unlock_bh(&dn_fib_rules_lock);
+ dn_fib_rule_put(r);
+ err = 0;
+ break;
+ }
+ }
+
+ return err;
+}
+
+void dn_fib_rule_put(struct dn_fib_rule *r)
+{
+ if (atomic_dec_and_test(&r->r_clntref)) {
+ if (r->r_dead)
+ kfree(r);
+ else
+ printk(KERN_DEBUG "Attempt to free alive dn_fib_rule\n");
+ }
+}
+
+
+int dn_fib_rtm_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct rtmsg *rtm = NLMSG_DATA(nlh);
+ struct dn_fib_rule *r, *new_r, **rp;
+ unsigned char table_id;
+
+ if (rtm->rtm_src_len > 16 || rtm->rtm_dst_len > 16)
+ return -EINVAL;
+
+ if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
+ return -EINVAL;
+
+ if (rtm->rtm_type == RTN_NAT)
+ return -EINVAL;
+
+ table_id = rtm->rtm_table;
+ if (table_id == RT_TABLE_UNSPEC) {
+ struct dn_fib_table *tb;
+ if (rtm->rtm_type == RTN_UNICAST) {
+ if ((tb = dn_fib_empty_table()) == NULL)
+ return -ENOBUFS;
+ table_id = tb->n;
+ }
+ }
+
+ new_r = kmalloc(sizeof(*new_r), GFP_KERNEL);
+ if (!new_r)
+ return -ENOMEM;
+ memset(new_r, 0, sizeof(*new_r));
+ if (rta[RTA_SRC-1])
+ memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 2);
+ if (rta[RTA_DST-1])
+ memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 2);
+ if (rta[RTA_GATEWAY-1])
+ memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 2);
+ new_r->r_src_len = rtm->rtm_src_len;
+ new_r->r_dst_len = rtm->rtm_dst_len;
+ new_r->r_srcmask = dnet_make_mask(rtm->rtm_src_len);
+ new_r->r_dstmask = dnet_make_mask(rtm->rtm_dst_len);
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ if (rta[RTA_PROTOINFO-1])
+ memcpy(&new_r->r_fwmark, RTA_DATA(rta[RTA_PROTOINFO-1]), 4);
+#endif
+ new_r->r_action = rtm->rtm_type;
+ new_r->r_flags = rtm->rtm_flags;
+ if (rta[RTA_PRIORITY-1])
+ memcpy(&new_r->r_preference, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
+ new_r->r_table = table_id;
+ if (rta[RTA_IIF-1]) {
+ struct net_device *dev;
+ rtattr_strlcpy(new_r->r_ifname, rta[RTA_IIF-1], IFNAMSIZ);
+ new_r->r_ifindex = -1;
+ dev = dev_get_by_name(new_r->r_ifname);
+ if (dev) {
+ new_r->r_ifindex = dev->ifindex;
+ dev_put(dev);
+ }
+ }
+
+ rp = &dn_fib_rules;
+ if (!new_r->r_preference) {
+ r = dn_fib_rules;
+ if (r && (r = r->r_next) != NULL) {
+ rp = &dn_fib_rules->r_next;
+ if (r->r_preference)
+ new_r->r_preference = r->r_preference - 1;
+ }
+ }
+
+ while((r=*rp) != NULL) {
+ if (r->r_preference > new_r->r_preference)
+ break;
+ rp = &r->r_next;
+ }
+
+ new_r->r_next = r;
+ atomic_inc(&new_r->r_clntref);
+ write_lock_bh(&dn_fib_rules_lock);
+ *rp = new_r;
+ write_unlock_bh(&dn_fib_rules_lock);
+ return 0;
+}
+
+
+int dn_fib_lookup(const struct flowi *flp, struct dn_fib_res *res)
+{
+ struct dn_fib_rule *r, *policy;
+ struct dn_fib_table *tb;
+ dn_address saddr = flp->fld_src;
+ dn_address daddr = flp->fld_dst;
+ int err;
+
+ read_lock(&dn_fib_rules_lock);
+ for(r = dn_fib_rules; r; r = r->r_next) {
+ if (((saddr^r->r_src) & r->r_srcmask) ||
+ ((daddr^r->r_dst) & r->r_dstmask) ||
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ (r->r_fwmark && r->r_fwmark != flp->fld_fwmark) ||
+#endif
+ (r->r_ifindex && r->r_ifindex != flp->iif))
+ continue;
+
+ switch(r->r_action) {
+ case RTN_UNICAST:
+ case RTN_NAT:
+ policy = r;
+ break;
+ case RTN_UNREACHABLE:
+ read_unlock(&dn_fib_rules_lock);
+ return -ENETUNREACH;
+ default:
+ case RTN_BLACKHOLE:
+ read_unlock(&dn_fib_rules_lock);
+ return -EINVAL;
+ case RTN_PROHIBIT:
+ read_unlock(&dn_fib_rules_lock);
+ return -EACCES;
+ }
+
+ if ((tb = dn_fib_get_table(r->r_table, 0)) == NULL)
+ continue;
+ err = tb->lookup(tb, flp, res);
+ if (err == 0) {
+ res->r = policy;
+ if (policy)
+ atomic_inc(&policy->r_clntref);
+ read_unlock(&dn_fib_rules_lock);
+ return 0;
+ }
+ if (err < 0 && err != -EAGAIN) {
+ read_unlock(&dn_fib_rules_lock);
+ return err;
+ }
+ }
+
+ read_unlock(&dn_fib_rules_lock);
+ return -ESRCH;
+}
+
+unsigned dnet_addr_type(__u16 addr)
+{
+ struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
+ struct dn_fib_res res;
+ unsigned ret = RTN_UNICAST;
+ struct dn_fib_table *tb = dn_fib_tables[RT_TABLE_LOCAL];
+
+ res.r = NULL;
+
+ if (tb) {
+ if (!tb->lookup(tb, &fl, &res)) {
+ ret = res.type;
+ dn_fib_res_put(&res);
+ }
+ }
+ return ret;
+}
+
+__u16 dn_fib_rules_policy(__u16 saddr, struct dn_fib_res *res, unsigned *flags)
+{
+ struct dn_fib_rule *r = res->r;
+
+ if (r->r_action == RTN_NAT) {
+ int addrtype = dnet_addr_type(r->r_srcmap);
+
+ if (addrtype == RTN_NAT) {
+ saddr = (saddr&~r->r_srcmask)|r->r_srcmap;
+ *flags |= RTCF_SNAT;
+ } else if (addrtype == RTN_LOCAL || r->r_srcmap == 0) {
+ saddr = r->r_srcmap;
+ *flags |= RTCF_MASQ;
+ }
+ }
+ return saddr;
+}
+
+static void dn_fib_rules_detach(struct net_device *dev)
+{
+ struct dn_fib_rule *r;
+
+ for(r = dn_fib_rules; r; r = r->r_next) {
+ if (r->r_ifindex == dev->ifindex) {
+ write_lock_bh(&dn_fib_rules_lock);
+ r->r_ifindex = -1;
+ write_unlock_bh(&dn_fib_rules_lock);
+ }
+ }
+}
+
+static void dn_fib_rules_attach(struct net_device *dev)
+{
+ struct dn_fib_rule *r;
+
+ for(r = dn_fib_rules; r; r = r->r_next) {
+ if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0) {
+ write_lock_bh(&dn_fib_rules_lock);
+ r->r_ifindex = dev->ifindex;
+ write_unlock_bh(&dn_fib_rules_lock);
+ }
+ }
+}
+
+static int dn_fib_rules_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ struct net_device *dev = ptr;
+
+ switch(event) {
+ case NETDEV_UNREGISTER:
+ dn_fib_rules_detach(dev);
+ dn_fib_sync_down(0, dev, 1);
+ case NETDEV_REGISTER:
+ dn_fib_rules_attach(dev);
+ dn_fib_sync_up(dev);
+ }
+
+ return NOTIFY_DONE;
+}
+
+
+static struct notifier_block dn_fib_rules_notifier = {
+ .notifier_call = dn_fib_rules_event,
+};
+
+static int dn_fib_fill_rule(struct sk_buff *skb, struct dn_fib_rule *r, struct netlink_callback *cb)
+{
+ struct rtmsg *rtm;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+
+
+ nlh = NLMSG_PUT(skb, NETLINK_CREDS(cb->skb)->pid, cb->nlh->nlmsg_seq, RTM_NEWRULE, sizeof(*rtm));
+ rtm = NLMSG_DATA(nlh);
+ rtm->rtm_family = AF_DECnet;
+ rtm->rtm_dst_len = r->r_dst_len;
+ rtm->rtm_src_len = r->r_src_len;
+ rtm->rtm_tos = 0;
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ if (r->r_fwmark)
+ RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark);
+#endif
+ rtm->rtm_table = r->r_table;
+ rtm->rtm_protocol = 0;
+ rtm->rtm_scope = 0;
+ rtm->rtm_type = r->r_action;
+ rtm->rtm_flags = r->r_flags;
+
+ if (r->r_dst_len)
+ RTA_PUT(skb, RTA_DST, 2, &r->r_dst);
+ if (r->r_src_len)
+ RTA_PUT(skb, RTA_SRC, 2, &r->r_src);
+ if (r->r_ifname[0])
+ RTA_PUT(skb, RTA_IIF, IFNAMSIZ, &r->r_ifname);
+ if (r->r_preference)
+ RTA_PUT(skb, RTA_PRIORITY, 4, &r->r_preference);
+ if (r->r_srcmap)
+ RTA_PUT(skb, RTA_GATEWAY, 2, &r->r_srcmap);
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int idx;
+ int s_idx = cb->args[0];
+ struct dn_fib_rule *r;
+
+ read_lock(&dn_fib_rules_lock);
+ for(r = dn_fib_rules, idx = 0; r; r = r->r_next, idx++) {
+ if (idx < s_idx)
+ continue;
+ if (dn_fib_fill_rule(skb, r, cb) < 0)
+ break;
+ }
+ read_unlock(&dn_fib_rules_lock);
+ cb->args[0] = idx;
+
+ return skb->len;
+}
+
+void __init dn_fib_rules_init(void)
+{
+ register_netdevice_notifier(&dn_fib_rules_notifier);
+}
+
+void __exit dn_fib_rules_cleanup(void)
+{
+ unregister_netdevice_notifier(&dn_fib_rules_notifier);
+}
+
+