diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/addrconf.c | 69 |
1 files changed, 48 insertions, 21 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index a55500cc0b29..9a852156a8f3 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -824,12 +824,13 @@ static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *i { struct inet6_dev *idev = ifp->idev; struct in6_addr addr, *tmpaddr; - unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age; + unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; unsigned long regen_advance; int tmp_plen; int ret = 0; int max_addresses; u32 addr_flags; + unsigned long now = jiffies; write_lock(&idev->lock); if (ift) { @@ -874,7 +875,7 @@ retry: goto out; } memcpy(&addr.s6_addr[8], idev->rndid, 8); - age = (jiffies - ifp->tstamp) / HZ; + age = (now - ifp->tstamp) / HZ; tmp_valid_lft = min_t(__u32, ifp->valid_lft, idev->cnf.temp_valid_lft + age); @@ -884,7 +885,6 @@ retry: idev->cnf.max_desync_factor); tmp_plen = ifp->prefix_len; max_addresses = idev->cnf.max_addresses; - tmp_cstamp = ifp->cstamp; tmp_tstamp = ifp->tstamp; spin_unlock_bh(&ifp->lock); @@ -929,7 +929,7 @@ retry: ift->ifpub = ifp; ift->valid_lft = tmp_valid_lft; ift->prefered_lft = tmp_prefered_lft; - ift->cstamp = tmp_cstamp; + ift->cstamp = now; ift->tstamp = tmp_tstamp; spin_unlock_bh(&ift->lock); @@ -1999,25 +1999,50 @@ ok: #ifdef CONFIG_IPV6_PRIVACY read_lock_bh(&in6_dev->lock); /* update all temporary addresses in the list */ - list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) { - /* - * When adjusting the lifetimes of an existing - * temporary address, only lower the lifetimes. - * Implementations must not increase the - * lifetimes of an existing temporary address - * when processing a Prefix Information Option. - */ + list_for_each_entry(ift, &in6_dev->tempaddr_list, + tmp_list) { + int age, max_valid, max_prefered; + if (ifp != ift->ifpub) continue; + /* + * RFC 4941 section 3.3: + * If a received option will extend the lifetime + * of a public address, the lifetimes of + * temporary addresses should be extended, + * subject to the overall constraint that no + * temporary addresses should ever remain + * "valid" or "preferred" for a time longer than + * (TEMP_VALID_LIFETIME) or + * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), + * respectively. + */ + age = (now - ift->cstamp) / HZ; + max_valid = in6_dev->cnf.temp_valid_lft - age; + if (max_valid < 0) + max_valid = 0; + + max_prefered = in6_dev->cnf.temp_prefered_lft - + in6_dev->cnf.max_desync_factor - + age; + if (max_prefered < 0) + max_prefered = 0; + + if (valid_lft > max_valid) + valid_lft = max_valid; + + if (prefered_lft > max_prefered) + prefered_lft = max_prefered; + spin_lock(&ift->lock); flags = ift->flags; - if (ift->valid_lft > valid_lft && - ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) - ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; - if (ift->prefered_lft > prefered_lft && - ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) - ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; + ift->valid_lft = valid_lft; + ift->prefered_lft = prefered_lft; + ift->tstamp = now; + if (prefered_lft > 0) + ift->flags &= ~IFA_F_DEPRECATED; + spin_unlock(&ift->lock); if (!(flags&IFA_F_TENTATIVE)) ipv6_ifa_notify(0, ift); @@ -2025,9 +2050,11 @@ ok: if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { /* - * When a new public address is created as described in [ADDRCONF], - * also create a new temporary address. Also create a temporary - * address if it's enabled but no temporary address currently exists. + * When a new public address is created as + * described in [ADDRCONF], also create a new + * temporary address. Also create a temporary + * address if it's enabled but no temporary + * address currently exists. */ read_unlock_bh(&in6_dev->lock); ipv6_create_tempaddr(ifp, NULL); |