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Diffstat (limited to 'net/core/neighbour.c')
-rw-r--r--net/core/neighbour.c317
1 files changed, 314 insertions, 3 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 43bdc521e20..0841ac78c67 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1276,9 +1276,14 @@ struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
INIT_RCU_HEAD(&p->rcu_head);
p->reachable_time =
neigh_rand_reach_time(p->base_reachable_time);
- if (dev && dev->neigh_setup && dev->neigh_setup(dev, p)) {
- kfree(p);
- return NULL;
+ if (dev) {
+ if (dev->neigh_setup && dev->neigh_setup(dev, p)) {
+ kfree(p);
+ return NULL;
+ }
+
+ dev_hold(dev);
+ p->dev = dev;
}
p->sysctl_table = NULL;
write_lock_bh(&tbl->lock);
@@ -1309,6 +1314,8 @@ void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms)
*p = parms->next;
parms->dead = 1;
write_unlock_bh(&tbl->lock);
+ if (parms->dev)
+ dev_put(parms->dev);
call_rcu(&parms->rcu_head, neigh_rcu_free_parms);
return;
}
@@ -1546,6 +1553,308 @@ out:
return err;
}
+static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms)
+{
+ struct rtattr *nest = RTA_NEST(skb, NDTA_PARMS);
+
+ if (parms->dev)
+ RTA_PUT_U32(skb, NDTPA_IFINDEX, parms->dev->ifindex);
+
+ RTA_PUT_U32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt));
+ RTA_PUT_U32(skb, NDTPA_QUEUE_LEN, parms->queue_len);
+ RTA_PUT_U32(skb, NDTPA_PROXY_QLEN, parms->proxy_qlen);
+ RTA_PUT_U32(skb, NDTPA_APP_PROBES, parms->app_probes);
+ RTA_PUT_U32(skb, NDTPA_UCAST_PROBES, parms->ucast_probes);
+ RTA_PUT_U32(skb, NDTPA_MCAST_PROBES, parms->mcast_probes);
+ RTA_PUT_MSECS(skb, NDTPA_REACHABLE_TIME, parms->reachable_time);
+ RTA_PUT_MSECS(skb, NDTPA_BASE_REACHABLE_TIME,
+ parms->base_reachable_time);
+ RTA_PUT_MSECS(skb, NDTPA_GC_STALETIME, parms->gc_staletime);
+ RTA_PUT_MSECS(skb, NDTPA_DELAY_PROBE_TIME, parms->delay_probe_time);
+ RTA_PUT_MSECS(skb, NDTPA_RETRANS_TIME, parms->retrans_time);
+ RTA_PUT_MSECS(skb, NDTPA_ANYCAST_DELAY, parms->anycast_delay);
+ RTA_PUT_MSECS(skb, NDTPA_PROXY_DELAY, parms->proxy_delay);
+ RTA_PUT_MSECS(skb, NDTPA_LOCKTIME, parms->locktime);
+
+ return RTA_NEST_END(skb, nest);
+
+rtattr_failure:
+ return RTA_NEST_CANCEL(skb, nest);
+}
+
+static int neightbl_fill_info(struct neigh_table *tbl, struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct nlmsghdr *nlh;
+ struct ndtmsg *ndtmsg;
+
+ nlh = NLMSG_PUT_ANSWER(skb, cb, RTM_NEWNEIGHTBL, sizeof(struct ndtmsg));
+ ndtmsg = NLMSG_DATA(nlh);
+
+ NLMSG_SET_MULTIPART(nlh);
+
+ read_lock_bh(&tbl->lock);
+ ndtmsg->ndtm_family = tbl->family;
+
+ RTA_PUT_STRING(skb, NDTA_NAME, tbl->id);
+ RTA_PUT_MSECS(skb, NDTA_GC_INTERVAL, tbl->gc_interval);
+ RTA_PUT_U32(skb, NDTA_THRESH1, tbl->gc_thresh1);
+ RTA_PUT_U32(skb, NDTA_THRESH2, tbl->gc_thresh2);
+ RTA_PUT_U32(skb, NDTA_THRESH3, tbl->gc_thresh3);
+
+ {
+ unsigned long now = jiffies;
+ unsigned int flush_delta = now - tbl->last_flush;
+ unsigned int rand_delta = now - tbl->last_rand;
+
+ struct ndt_config ndc = {
+ .ndtc_key_len = tbl->key_len,
+ .ndtc_entry_size = tbl->entry_size,
+ .ndtc_entries = atomic_read(&tbl->entries),
+ .ndtc_last_flush = jiffies_to_msecs(flush_delta),
+ .ndtc_last_rand = jiffies_to_msecs(rand_delta),
+ .ndtc_hash_rnd = tbl->hash_rnd,
+ .ndtc_hash_mask = tbl->hash_mask,
+ .ndtc_hash_chain_gc = tbl->hash_chain_gc,
+ .ndtc_proxy_qlen = tbl->proxy_queue.qlen,
+ };
+
+ RTA_PUT(skb, NDTA_CONFIG, sizeof(ndc), &ndc);
+ }
+
+ {
+ int cpu;
+ struct ndt_stats ndst;
+
+ memset(&ndst, 0, sizeof(ndst));
+
+ for (cpu = 0; cpu < NR_CPUS; cpu++) {
+ struct neigh_statistics *st;
+
+ if (!cpu_possible(cpu))
+ continue;
+
+ st = per_cpu_ptr(tbl->stats, cpu);
+ ndst.ndts_allocs += st->allocs;
+ ndst.ndts_destroys += st->destroys;
+ ndst.ndts_hash_grows += st->hash_grows;
+ ndst.ndts_res_failed += st->res_failed;
+ ndst.ndts_lookups += st->lookups;
+ ndst.ndts_hits += st->hits;
+ ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast;
+ ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast;
+ ndst.ndts_periodic_gc_runs += st->periodic_gc_runs;
+ ndst.ndts_forced_gc_runs += st->forced_gc_runs;
+ }
+
+ RTA_PUT(skb, NDTA_STATS, sizeof(ndst), &ndst);
+ }
+
+ BUG_ON(tbl->parms.dev);
+ if (neightbl_fill_parms(skb, &tbl->parms) < 0)
+ goto rtattr_failure;
+
+ read_unlock_bh(&tbl->lock);
+ return NLMSG_END(skb, nlh);
+
+rtattr_failure:
+ read_unlock_bh(&tbl->lock);
+ return NLMSG_CANCEL(skb, nlh);
+
+nlmsg_failure:
+ return -1;
+}
+
+static int neightbl_fill_param_info(struct neigh_table *tbl,
+ struct neigh_parms *parms,
+ struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct ndtmsg *ndtmsg;
+ struct nlmsghdr *nlh;
+
+ nlh = NLMSG_PUT_ANSWER(skb, cb, RTM_NEWNEIGHTBL, sizeof(struct ndtmsg));
+ ndtmsg = NLMSG_DATA(nlh);
+
+ NLMSG_SET_MULTIPART(nlh);
+
+ read_lock_bh(&tbl->lock);
+ ndtmsg->ndtm_family = tbl->family;
+ RTA_PUT_STRING(skb, NDTA_NAME, tbl->id);
+
+ if (neightbl_fill_parms(skb, parms) < 0)
+ goto rtattr_failure;
+
+ read_unlock_bh(&tbl->lock);
+ return NLMSG_END(skb, nlh);
+
+rtattr_failure:
+ read_unlock_bh(&tbl->lock);
+ return NLMSG_CANCEL(skb, nlh);
+
+nlmsg_failure:
+ return -1;
+}
+
+static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl,
+ int ifindex)
+{
+ struct neigh_parms *p;
+
+ for (p = &tbl->parms; p; p = p->next)
+ if ((p->dev && p->dev->ifindex == ifindex) ||
+ (!p->dev && !ifindex))
+ return p;
+
+ return NULL;
+}
+
+int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct neigh_table *tbl;
+ struct ndtmsg *ndtmsg = NLMSG_DATA(nlh);
+ struct rtattr **tb = arg;
+ int err = -EINVAL;
+
+ if (!tb[NDTA_NAME - 1] || !RTA_PAYLOAD(tb[NDTA_NAME - 1]))
+ return -EINVAL;
+
+ read_lock(&neigh_tbl_lock);
+ for (tbl = neigh_tables; tbl; tbl = tbl->next) {
+ if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family)
+ continue;
+
+ if (!rtattr_strcmp(tb[NDTA_NAME - 1], tbl->id))
+ break;
+ }
+
+ if (tbl == NULL) {
+ err = -ENOENT;
+ goto errout;
+ }
+
+ /*
+ * We acquire tbl->lock to be nice to the periodic timers and
+ * make sure they always see a consistent set of values.
+ */
+ write_lock_bh(&tbl->lock);
+
+ if (tb[NDTA_THRESH1 - 1])
+ tbl->gc_thresh1 = RTA_GET_U32(tb[NDTA_THRESH1 - 1]);
+
+ if (tb[NDTA_THRESH2 - 1])
+ tbl->gc_thresh2 = RTA_GET_U32(tb[NDTA_THRESH2 - 1]);
+
+ if (tb[NDTA_THRESH3 - 1])
+ tbl->gc_thresh3 = RTA_GET_U32(tb[NDTA_THRESH3 - 1]);
+
+ if (tb[NDTA_GC_INTERVAL - 1])
+ tbl->gc_interval = RTA_GET_MSECS(tb[NDTA_GC_INTERVAL - 1]);
+
+ if (tb[NDTA_PARMS - 1]) {
+ struct rtattr *tbp[NDTPA_MAX];
+ struct neigh_parms *p;
+ u32 ifindex = 0;
+
+ if (rtattr_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS - 1]) < 0)
+ goto rtattr_failure;
+
+ if (tbp[NDTPA_IFINDEX - 1])
+ ifindex = RTA_GET_U32(tbp[NDTPA_IFINDEX - 1]);
+
+ p = lookup_neigh_params(tbl, ifindex);
+ if (p == NULL) {
+ err = -ENOENT;
+ goto rtattr_failure;
+ }
+
+ if (tbp[NDTPA_QUEUE_LEN - 1])
+ p->queue_len = RTA_GET_U32(tbp[NDTPA_QUEUE_LEN - 1]);
+
+ if (tbp[NDTPA_PROXY_QLEN - 1])
+ p->proxy_qlen = RTA_GET_U32(tbp[NDTPA_PROXY_QLEN - 1]);
+
+ if (tbp[NDTPA_APP_PROBES - 1])
+ p->app_probes = RTA_GET_U32(tbp[NDTPA_APP_PROBES - 1]);
+
+ if (tbp[NDTPA_UCAST_PROBES - 1])
+ p->ucast_probes =
+ RTA_GET_U32(tbp[NDTPA_UCAST_PROBES - 1]);
+
+ if (tbp[NDTPA_MCAST_PROBES - 1])
+ p->mcast_probes =
+ RTA_GET_U32(tbp[NDTPA_MCAST_PROBES - 1]);
+
+ if (tbp[NDTPA_BASE_REACHABLE_TIME - 1])
+ p->base_reachable_time =
+ RTA_GET_MSECS(tbp[NDTPA_BASE_REACHABLE_TIME - 1]);
+
+ if (tbp[NDTPA_GC_STALETIME - 1])
+ p->gc_staletime =
+ RTA_GET_MSECS(tbp[NDTPA_GC_STALETIME - 1]);
+
+ if (tbp[NDTPA_DELAY_PROBE_TIME - 1])
+ p->delay_probe_time =
+ RTA_GET_MSECS(tbp[NDTPA_DELAY_PROBE_TIME - 1]);
+
+ if (tbp[NDTPA_RETRANS_TIME - 1])
+ p->retrans_time =
+ RTA_GET_MSECS(tbp[NDTPA_RETRANS_TIME - 1]);
+
+ if (tbp[NDTPA_ANYCAST_DELAY - 1])
+ p->anycast_delay =
+ RTA_GET_MSECS(tbp[NDTPA_ANYCAST_DELAY - 1]);
+
+ if (tbp[NDTPA_PROXY_DELAY - 1])
+ p->proxy_delay =
+ RTA_GET_MSECS(tbp[NDTPA_PROXY_DELAY - 1]);
+
+ if (tbp[NDTPA_LOCKTIME - 1])
+ p->locktime = RTA_GET_MSECS(tbp[NDTPA_LOCKTIME - 1]);
+ }
+
+ err = 0;
+
+rtattr_failure:
+ write_unlock_bh(&tbl->lock);
+errout:
+ read_unlock(&neigh_tbl_lock);
+ return err;
+}
+
+int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int idx, family;
+ int s_idx = cb->args[0];
+ struct neigh_table *tbl;
+
+ family = ((struct rtgenmsg *)NLMSG_DATA(cb->nlh))->rtgen_family;
+
+ read_lock(&neigh_tbl_lock);
+ for (tbl = neigh_tables, idx = 0; tbl; tbl = tbl->next) {
+ struct neigh_parms *p;
+
+ if (idx < s_idx || (family && tbl->family != family))
+ continue;
+
+ if (neightbl_fill_info(tbl, skb, cb) <= 0)
+ break;
+
+ for (++idx, p = tbl->parms.next; p; p = p->next, idx++) {
+ if (idx < s_idx)
+ continue;
+
+ if (neightbl_fill_param_info(tbl, p, skb, cb) <= 0)
+ goto out;
+ }
+
+ }
+out:
+ read_unlock(&neigh_tbl_lock);
+ cb->args[0] = idx;
+
+ return skb->len;
+}
static int neigh_fill_info(struct sk_buff *skb, struct neighbour *n,
u32 pid, u32 seq, int event)
@@ -2352,6 +2661,8 @@ EXPORT_SYMBOL(neigh_update);
EXPORT_SYMBOL(neigh_update_hhs);
EXPORT_SYMBOL(pneigh_enqueue);
EXPORT_SYMBOL(pneigh_lookup);
+EXPORT_SYMBOL(neightbl_dump_info);
+EXPORT_SYMBOL(neightbl_set);
#ifdef CONFIG_ARPD
EXPORT_SYMBOL(neigh_app_ns);