forked from luck/tmp_suning_uos_patched
ea69763999
This patch adds the minimum necessary for the RTAX_CC_ALGO congestion control metric to be set up and dumped back to user space. While the internal representation of RTAX_CC_ALGO is handled as a u32 key, we avoided to expose this implementation detail to user space, thus instead, we chose the netlink attribute that is being exchanged between user space to be the actual congestion control algorithm name, similarly as in the setsockopt(2) API in order to allow for maximum flexibility, even for 3rd party modules. It is a bit unfortunate that RTAX_QUICKACK used up a whole RTAX slot as it should have been stored in RTAX_FEATURES instead, we first thought about reusing it for the congestion control key, but it brings more complications and/or confusion than worth it. Joint work with Florian Westphal. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
792 lines
18 KiB
C
792 lines
18 KiB
C
/*
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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* operating system. DECnet is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* DECnet Routing Forwarding Information Base (Glue/Info List)
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*
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* Author: Steve Whitehouse <SteveW@ACM.org>
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*
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*
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* Changes:
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* Alexey Kuznetsov : SMP locking changes
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* Steve Whitehouse : Rewrote it... Well to be more correct, I
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* copied most of it from the ipv4 fib code.
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* Steve Whitehouse : Updated it in style and fixed a few bugs
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* which were fixed in the ipv4 code since
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* this code was copied from it.
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*
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*/
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#include <linux/string.h>
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#include <linux/net.h>
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#include <linux/socket.h>
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#include <linux/slab.h>
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#include <linux/sockios.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/proc_fs.h>
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#include <linux/netdevice.h>
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#include <linux/timer.h>
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#include <linux/spinlock.h>
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#include <linux/atomic.h>
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#include <asm/uaccess.h>
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#include <net/neighbour.h>
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#include <net/dst.h>
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#include <net/flow.h>
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#include <net/fib_rules.h>
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#include <net/dn.h>
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#include <net/dn_route.h>
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#include <net/dn_fib.h>
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#include <net/dn_neigh.h>
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#include <net/dn_dev.h>
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#define RT_MIN_TABLE 1
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#define for_fib_info() { struct dn_fib_info *fi;\
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for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
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#define endfor_fib_info() }
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#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
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for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
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#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
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for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
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#define endfor_nexthops(fi) }
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static DEFINE_SPINLOCK(dn_fib_multipath_lock);
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static struct dn_fib_info *dn_fib_info_list;
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static DEFINE_SPINLOCK(dn_fib_info_lock);
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static struct
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{
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int error;
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u8 scope;
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} dn_fib_props[RTN_MAX+1] = {
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[RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
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[RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
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[RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
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[RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
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[RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
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[RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
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[RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
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[RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
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[RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
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[RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
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[RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
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[RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
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};
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static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
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static int dn_fib_sync_up(struct net_device *dev);
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void dn_fib_free_info(struct dn_fib_info *fi)
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{
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if (fi->fib_dead == 0) {
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printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
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return;
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}
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change_nexthops(fi) {
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if (nh->nh_dev)
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dev_put(nh->nh_dev);
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nh->nh_dev = NULL;
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} endfor_nexthops(fi);
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kfree(fi);
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}
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void dn_fib_release_info(struct dn_fib_info *fi)
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{
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spin_lock(&dn_fib_info_lock);
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if (fi && --fi->fib_treeref == 0) {
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if (fi->fib_next)
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fi->fib_next->fib_prev = fi->fib_prev;
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if (fi->fib_prev)
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fi->fib_prev->fib_next = fi->fib_next;
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if (fi == dn_fib_info_list)
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dn_fib_info_list = fi->fib_next;
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fi->fib_dead = 1;
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dn_fib_info_put(fi);
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}
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spin_unlock(&dn_fib_info_lock);
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}
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static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
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{
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const struct dn_fib_nh *onh = ofi->fib_nh;
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for_nexthops(fi) {
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if (nh->nh_oif != onh->nh_oif ||
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nh->nh_gw != onh->nh_gw ||
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nh->nh_scope != onh->nh_scope ||
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nh->nh_weight != onh->nh_weight ||
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((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
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return -1;
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onh++;
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} endfor_nexthops(fi);
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return 0;
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}
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static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
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{
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for_fib_info() {
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if (fi->fib_nhs != nfi->fib_nhs)
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continue;
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if (nfi->fib_protocol == fi->fib_protocol &&
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nfi->fib_prefsrc == fi->fib_prefsrc &&
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nfi->fib_priority == fi->fib_priority &&
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memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
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((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
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(nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
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return fi;
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} endfor_fib_info();
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return NULL;
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}
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static int dn_fib_count_nhs(const struct nlattr *attr)
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{
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struct rtnexthop *nhp = nla_data(attr);
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int nhs = 0, nhlen = nla_len(attr);
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while(nhlen >= (int)sizeof(struct rtnexthop)) {
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if ((nhlen -= nhp->rtnh_len) < 0)
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return 0;
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nhs++;
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nhp = RTNH_NEXT(nhp);
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}
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return nhs;
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}
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static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr,
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const struct rtmsg *r)
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{
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struct rtnexthop *nhp = nla_data(attr);
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int nhlen = nla_len(attr);
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change_nexthops(fi) {
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int attrlen = nhlen - sizeof(struct rtnexthop);
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if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
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return -EINVAL;
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nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
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nh->nh_oif = nhp->rtnh_ifindex;
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nh->nh_weight = nhp->rtnh_hops + 1;
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if (attrlen) {
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struct nlattr *gw_attr;
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gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
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nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
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}
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nhp = RTNH_NEXT(nhp);
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} endfor_nexthops(fi);
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return 0;
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}
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static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
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{
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int err;
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if (nh->nh_gw) {
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struct flowidn fld;
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struct dn_fib_res res;
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if (nh->nh_flags&RTNH_F_ONLINK) {
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struct net_device *dev;
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if (r->rtm_scope >= RT_SCOPE_LINK)
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return -EINVAL;
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if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
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return -EINVAL;
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if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
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return -ENODEV;
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if (!(dev->flags&IFF_UP))
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return -ENETDOWN;
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nh->nh_dev = dev;
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dev_hold(dev);
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nh->nh_scope = RT_SCOPE_LINK;
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return 0;
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}
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memset(&fld, 0, sizeof(fld));
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fld.daddr = nh->nh_gw;
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fld.flowidn_oif = nh->nh_oif;
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fld.flowidn_scope = r->rtm_scope + 1;
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if (fld.flowidn_scope < RT_SCOPE_LINK)
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fld.flowidn_scope = RT_SCOPE_LINK;
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if ((err = dn_fib_lookup(&fld, &res)) != 0)
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return err;
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err = -EINVAL;
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if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
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goto out;
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nh->nh_scope = res.scope;
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nh->nh_oif = DN_FIB_RES_OIF(res);
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nh->nh_dev = DN_FIB_RES_DEV(res);
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if (nh->nh_dev == NULL)
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goto out;
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dev_hold(nh->nh_dev);
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err = -ENETDOWN;
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if (!(nh->nh_dev->flags & IFF_UP))
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goto out;
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err = 0;
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out:
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dn_fib_res_put(&res);
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return err;
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} else {
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struct net_device *dev;
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if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
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return -EINVAL;
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dev = __dev_get_by_index(&init_net, nh->nh_oif);
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if (dev == NULL || dev->dn_ptr == NULL)
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return -ENODEV;
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if (!(dev->flags&IFF_UP))
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return -ENETDOWN;
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nh->nh_dev = dev;
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dev_hold(nh->nh_dev);
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nh->nh_scope = RT_SCOPE_HOST;
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}
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return 0;
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}
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struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
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const struct nlmsghdr *nlh, int *errp)
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{
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int err;
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struct dn_fib_info *fi = NULL;
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struct dn_fib_info *ofi;
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int nhs = 1;
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if (r->rtm_type > RTN_MAX)
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goto err_inval;
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if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
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goto err_inval;
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if (attrs[RTA_MULTIPATH] &&
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(nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
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goto err_inval;
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fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
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err = -ENOBUFS;
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if (fi == NULL)
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goto failure;
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fi->fib_protocol = r->rtm_protocol;
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fi->fib_nhs = nhs;
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fi->fib_flags = r->rtm_flags;
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if (attrs[RTA_PRIORITY])
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fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
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if (attrs[RTA_METRICS]) {
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struct nlattr *attr;
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int rem;
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nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
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int type = nla_type(attr);
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if (type) {
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if (type > RTAX_MAX || type == RTAX_CC_ALGO ||
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nla_len(attr) < 4)
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goto err_inval;
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fi->fib_metrics[type-1] = nla_get_u32(attr);
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}
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}
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}
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if (attrs[RTA_PREFSRC])
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fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
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if (attrs[RTA_MULTIPATH]) {
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if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
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goto failure;
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if (attrs[RTA_OIF] &&
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fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
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goto err_inval;
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if (attrs[RTA_GATEWAY] &&
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fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
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goto err_inval;
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} else {
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struct dn_fib_nh *nh = fi->fib_nh;
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if (attrs[RTA_OIF])
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nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
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if (attrs[RTA_GATEWAY])
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nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
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nh->nh_flags = r->rtm_flags;
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nh->nh_weight = 1;
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}
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if (r->rtm_type == RTN_NAT) {
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if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
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goto err_inval;
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fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
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goto link_it;
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}
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if (dn_fib_props[r->rtm_type].error) {
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if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
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goto err_inval;
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goto link_it;
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}
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if (r->rtm_scope > RT_SCOPE_HOST)
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goto err_inval;
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if (r->rtm_scope == RT_SCOPE_HOST) {
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struct dn_fib_nh *nh = fi->fib_nh;
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/* Local address is added */
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if (nhs != 1 || nh->nh_gw)
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goto err_inval;
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nh->nh_scope = RT_SCOPE_NOWHERE;
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nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
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err = -ENODEV;
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if (nh->nh_dev == NULL)
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goto failure;
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} else {
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change_nexthops(fi) {
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if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
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goto failure;
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} endfor_nexthops(fi)
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}
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if (fi->fib_prefsrc) {
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if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
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fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
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if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
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goto err_inval;
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}
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link_it:
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if ((ofi = dn_fib_find_info(fi)) != NULL) {
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fi->fib_dead = 1;
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dn_fib_free_info(fi);
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ofi->fib_treeref++;
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return ofi;
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}
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fi->fib_treeref++;
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atomic_inc(&fi->fib_clntref);
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spin_lock(&dn_fib_info_lock);
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fi->fib_next = dn_fib_info_list;
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fi->fib_prev = NULL;
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if (dn_fib_info_list)
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dn_fib_info_list->fib_prev = fi;
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dn_fib_info_list = fi;
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spin_unlock(&dn_fib_info_lock);
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return fi;
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err_inval:
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err = -EINVAL;
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failure:
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*errp = err;
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if (fi) {
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fi->fib_dead = 1;
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dn_fib_free_info(fi);
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}
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return NULL;
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}
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int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
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{
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int err = dn_fib_props[type].error;
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if (err == 0) {
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if (fi->fib_flags & RTNH_F_DEAD)
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return 1;
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res->fi = fi;
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switch (type) {
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case RTN_NAT:
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DN_FIB_RES_RESET(*res);
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atomic_inc(&fi->fib_clntref);
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return 0;
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case RTN_UNICAST:
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case RTN_LOCAL:
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for_nexthops(fi) {
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if (nh->nh_flags & RTNH_F_DEAD)
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continue;
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if (!fld->flowidn_oif ||
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fld->flowidn_oif == nh->nh_oif)
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break;
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}
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if (nhsel < fi->fib_nhs) {
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res->nh_sel = nhsel;
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atomic_inc(&fi->fib_clntref);
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return 0;
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}
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endfor_nexthops(fi);
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res->fi = NULL;
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return 1;
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default:
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net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
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type);
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res->fi = NULL;
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return -EINVAL;
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}
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}
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return err;
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}
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void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
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{
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struct dn_fib_info *fi = res->fi;
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int w;
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spin_lock_bh(&dn_fib_multipath_lock);
|
|
if (fi->fib_power <= 0) {
|
|
int power = 0;
|
|
change_nexthops(fi) {
|
|
if (!(nh->nh_flags&RTNH_F_DEAD)) {
|
|
power += nh->nh_weight;
|
|
nh->nh_power = nh->nh_weight;
|
|
}
|
|
} endfor_nexthops(fi);
|
|
fi->fib_power = power;
|
|
if (power < 0) {
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
res->nh_sel = 0;
|
|
return;
|
|
}
|
|
}
|
|
|
|
w = jiffies % fi->fib_power;
|
|
|
|
change_nexthops(fi) {
|
|
if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
|
|
if ((w -= nh->nh_power) <= 0) {
|
|
nh->nh_power--;
|
|
fi->fib_power--;
|
|
res->nh_sel = nhsel;
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
return;
|
|
}
|
|
}
|
|
} endfor_nexthops(fi);
|
|
res->nh_sel = 0;
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
}
|
|
|
|
static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
|
|
{
|
|
if (attrs[RTA_TABLE])
|
|
table = nla_get_u32(attrs[RTA_TABLE]);
|
|
|
|
return table;
|
|
}
|
|
|
|
static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct dn_fib_table *tb;
|
|
struct rtmsg *r = nlmsg_data(nlh);
|
|
struct nlattr *attrs[RTA_MAX+1];
|
|
int err;
|
|
|
|
if (!netlink_capable(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EINVAL;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
|
|
if (!tb)
|
|
return -ESRCH;
|
|
|
|
return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
|
|
}
|
|
|
|
static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct dn_fib_table *tb;
|
|
struct rtmsg *r = nlmsg_data(nlh);
|
|
struct nlattr *attrs[RTA_MAX+1];
|
|
int err;
|
|
|
|
if (!netlink_capable(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EINVAL;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
|
|
if (!tb)
|
|
return -ENOBUFS;
|
|
|
|
return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
|
|
}
|
|
|
|
static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
|
|
{
|
|
struct dn_fib_table *tb;
|
|
struct {
|
|
struct nlmsghdr nlh;
|
|
struct rtmsg rtm;
|
|
} req;
|
|
struct {
|
|
struct nlattr hdr;
|
|
__le16 dst;
|
|
} dst_attr = {
|
|
.dst = dst,
|
|
};
|
|
struct {
|
|
struct nlattr hdr;
|
|
__le16 prefsrc;
|
|
} prefsrc_attr = {
|
|
.prefsrc = ifa->ifa_local,
|
|
};
|
|
struct {
|
|
struct nlattr hdr;
|
|
u32 oif;
|
|
} oif_attr = {
|
|
.oif = ifa->ifa_dev->dev->ifindex,
|
|
};
|
|
struct nlattr *attrs[RTA_MAX+1] = {
|
|
[RTA_DST] = (struct nlattr *) &dst_attr,
|
|
[RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
|
|
[RTA_OIF] = (struct nlattr *) &oif_attr,
|
|
};
|
|
|
|
memset(&req.rtm, 0, sizeof(req.rtm));
|
|
|
|
if (type == RTN_UNICAST)
|
|
tb = dn_fib_get_table(RT_MIN_TABLE, 1);
|
|
else
|
|
tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
|
|
|
|
if (tb == NULL)
|
|
return;
|
|
|
|
req.nlh.nlmsg_len = sizeof(req);
|
|
req.nlh.nlmsg_type = cmd;
|
|
req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
|
|
req.nlh.nlmsg_pid = 0;
|
|
req.nlh.nlmsg_seq = 0;
|
|
|
|
req.rtm.rtm_dst_len = dst_len;
|
|
req.rtm.rtm_table = tb->n;
|
|
req.rtm.rtm_protocol = RTPROT_KERNEL;
|
|
req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
|
|
req.rtm.rtm_type = type;
|
|
|
|
if (cmd == RTM_NEWROUTE)
|
|
tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
|
|
else
|
|
tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL);
|
|
}
|
|
|
|
static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
|
|
{
|
|
|
|
fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
|
|
|
|
#if 0
|
|
if (!(dev->flags&IFF_UP))
|
|
return;
|
|
/* In the future, we will want to add default routes here */
|
|
|
|
#endif
|
|
}
|
|
|
|
static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
|
|
{
|
|
int found_it = 0;
|
|
struct net_device *dev;
|
|
struct dn_dev *dn_db;
|
|
struct dn_ifaddr *ifa2;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/* Scan device list */
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(&init_net, dev) {
|
|
dn_db = rcu_dereference(dev->dn_ptr);
|
|
if (dn_db == NULL)
|
|
continue;
|
|
for (ifa2 = rcu_dereference(dn_db->ifa_list);
|
|
ifa2 != NULL;
|
|
ifa2 = rcu_dereference(ifa2->ifa_next)) {
|
|
if (ifa2->ifa_local == ifa->ifa_local) {
|
|
found_it = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (found_it == 0) {
|
|
fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
|
|
|
|
if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
|
|
if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
|
|
dn_fib_flush();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void dn_fib_disable_addr(struct net_device *dev, int force)
|
|
{
|
|
if (dn_fib_sync_down(0, dev, force))
|
|
dn_fib_flush();
|
|
dn_rt_cache_flush(0);
|
|
neigh_ifdown(&dn_neigh_table, dev);
|
|
}
|
|
|
|
static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
|
|
|
|
switch (event) {
|
|
case NETDEV_UP:
|
|
dn_fib_add_ifaddr(ifa);
|
|
dn_fib_sync_up(ifa->ifa_dev->dev);
|
|
dn_rt_cache_flush(-1);
|
|
break;
|
|
case NETDEV_DOWN:
|
|
dn_fib_del_ifaddr(ifa);
|
|
if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
|
|
dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
|
|
} else {
|
|
dn_rt_cache_flush(-1);
|
|
}
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
|
|
{
|
|
int ret = 0;
|
|
int scope = RT_SCOPE_NOWHERE;
|
|
|
|
if (force)
|
|
scope = -1;
|
|
|
|
for_fib_info() {
|
|
/*
|
|
* This makes no sense for DECnet.... we will almost
|
|
* certainly have more than one local address the same
|
|
* over all our interfaces. It needs thinking about
|
|
* some more.
|
|
*/
|
|
if (local && fi->fib_prefsrc == local) {
|
|
fi->fib_flags |= RTNH_F_DEAD;
|
|
ret++;
|
|
} else if (dev && fi->fib_nhs) {
|
|
int dead = 0;
|
|
|
|
change_nexthops(fi) {
|
|
if (nh->nh_flags&RTNH_F_DEAD)
|
|
dead++;
|
|
else if (nh->nh_dev == dev &&
|
|
nh->nh_scope != scope) {
|
|
spin_lock_bh(&dn_fib_multipath_lock);
|
|
nh->nh_flags |= RTNH_F_DEAD;
|
|
fi->fib_power -= nh->nh_power;
|
|
nh->nh_power = 0;
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
dead++;
|
|
}
|
|
} endfor_nexthops(fi)
|
|
if (dead == fi->fib_nhs) {
|
|
fi->fib_flags |= RTNH_F_DEAD;
|
|
ret++;
|
|
}
|
|
}
|
|
} endfor_fib_info();
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int dn_fib_sync_up(struct net_device *dev)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!(dev->flags&IFF_UP))
|
|
return 0;
|
|
|
|
for_fib_info() {
|
|
int alive = 0;
|
|
|
|
change_nexthops(fi) {
|
|
if (!(nh->nh_flags&RTNH_F_DEAD)) {
|
|
alive++;
|
|
continue;
|
|
}
|
|
if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
|
|
continue;
|
|
if (nh->nh_dev != dev || dev->dn_ptr == NULL)
|
|
continue;
|
|
alive++;
|
|
spin_lock_bh(&dn_fib_multipath_lock);
|
|
nh->nh_power = 0;
|
|
nh->nh_flags &= ~RTNH_F_DEAD;
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
} endfor_nexthops(fi);
|
|
|
|
if (alive > 0) {
|
|
fi->fib_flags &= ~RTNH_F_DEAD;
|
|
ret++;
|
|
}
|
|
} endfor_fib_info();
|
|
return ret;
|
|
}
|
|
|
|
static struct notifier_block dn_fib_dnaddr_notifier = {
|
|
.notifier_call = dn_fib_dnaddr_event,
|
|
};
|
|
|
|
void __exit dn_fib_cleanup(void)
|
|
{
|
|
dn_fib_table_cleanup();
|
|
dn_fib_rules_cleanup();
|
|
|
|
unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
|
|
}
|
|
|
|
|
|
void __init dn_fib_init(void)
|
|
{
|
|
dn_fib_table_init();
|
|
dn_fib_rules_init();
|
|
|
|
register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
|
|
|
|
rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
|
|
rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
|
|
}
|
|
|
|
|