diff options
| -rw-r--r-- | net/ipv6/route.c | 57 |
1 files changed, 25 insertions, 32 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index cd60bcc..061a7bb 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -397,10 +397,6 @@ int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh, return err; } -/* No rt6_lock! If COW failed, the function returns dead route entry - with dst->error set to errno value. - */ - static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, struct in6_addr *saddr) { @@ -439,26 +435,6 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *dad return rt; } -static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr, - struct in6_addr *saddr, struct netlink_skb_parms *req) -{ - struct rt6_info *rt = rt6_alloc_cow(ort, daddr, saddr); - int err; - - if (!rt) { - dst_hold(&ip6_null_entry.u.dst); - return &ip6_null_entry; - } - - dst_hold(&rt->u.dst); - - err = ip6_ins_rt(rt, NULL, NULL, req); - if (err) - rt->u.dst.error = err; - - return rt; -} - static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) { struct rt6_info *rt = ip6_rt_copy(ort); @@ -518,15 +494,23 @@ restart: if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) { struct rt6_info *nrt; + int err; - nrt = rt6_cow(rt, &skb->nh.ipv6h->daddr, - &skb->nh.ipv6h->saddr, - &NETLINK_CB(skb)); + nrt = rt6_alloc_cow(rt, &skb->nh.ipv6h->daddr, + &skb->nh.ipv6h->saddr); dst_release(&rt->u.dst); - rt = nrt; + rt = nrt ? : &ip6_null_entry; + + dst_hold(&rt->u.dst); + if (nrt) { + err = ip6_ins_rt(nrt, NULL, NULL, + &NETLINK_CB(skb)); + if (!err) + goto out2; + } - if (rt->u.dst.error != -EEXIST || --attempts <= 0) + if (--attempts <= 0) goto out2; /* Race condition! In the gap, when rt6_lock was @@ -582,13 +566,21 @@ restart: if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) { struct rt6_info *nrt; + int err; - nrt = rt6_cow(rt, &fl->fl6_dst, &fl->fl6_src, NULL); + nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); dst_release(&rt->u.dst); - rt = nrt; + rt = nrt ? : &ip6_null_entry; - if (rt->u.dst.error != -EEXIST || --attempts <= 0) + dst_hold(&rt->u.dst); + if (nrt) { + err = ip6_ins_rt(nrt, NULL, NULL, NULL); + if (!err) + goto out2; + } + + if (--attempts <= 0) goto out2; /* Race condition! In the gap, when rt6_lock was @@ -597,6 +589,7 @@ restart: dst_release(&rt->u.dst); goto relookup; } + out2: rt->u.dst.lastuse = jiffies; rt->u.dst.__use++; |