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https://github.com/torvalds/linux.git
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Merge branch 'ipv6-lockless-dump-addrs'
Eric Dumazet says: ==================== ipv6: lockless inet6_dump_addr() This series removes RTNL locking to dump ipv6 addresses. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
570c86ed60
@ -717,7 +717,7 @@ errout:
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static u32 inet6_base_seq(const struct net *net)
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{
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u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
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net->dev_base_seq;
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READ_ONCE(net->dev_base_seq);
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/* Must not return 0 (see nl_dump_check_consistent()).
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* Chose a value far away from 0.
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@ -2728,7 +2728,7 @@ int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
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if (update_lft) {
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ifp->valid_lft = valid_lft;
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ifp->prefered_lft = prefered_lft;
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ifp->tstamp = now;
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WRITE_ONCE(ifp->tstamp, now);
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flags = ifp->flags;
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ifp->flags &= ~IFA_F_DEPRECATED;
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spin_unlock_bh(&ifp->lock);
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@ -4896,13 +4896,13 @@ static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
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IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
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IFA_F_NOPREFIXROUTE);
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ifp->flags |= cfg->ifa_flags;
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ifp->tstamp = jiffies;
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ifp->valid_lft = cfg->valid_lft;
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ifp->prefered_lft = cfg->preferred_lft;
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ifp->ifa_proto = cfg->ifa_proto;
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WRITE_ONCE(ifp->tstamp, jiffies);
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WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
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WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
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WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
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if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
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ifp->rt_priority = cfg->rt_priority;
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WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
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if (new_peer)
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ifp->peer_addr = *cfg->peer_pfx;
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@ -5123,17 +5123,21 @@ struct inet6_fill_args {
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enum addr_type_t type;
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};
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static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
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static int inet6_fill_ifaddr(struct sk_buff *skb,
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const struct inet6_ifaddr *ifa,
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struct inet6_fill_args *args)
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{
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struct nlmsghdr *nlh;
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u32 preferred, valid;
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u32 flags, priority;
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u8 proto;
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nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
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sizeof(struct ifaddrmsg), args->flags);
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if (!nlh)
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return -EMSGSIZE;
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flags = READ_ONCE(ifa->flags);
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put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
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ifa->idev->dev->ifindex);
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@ -5141,13 +5145,14 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
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nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
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goto error;
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spin_lock_bh(&ifa->lock);
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if (!((ifa->flags&IFA_F_PERMANENT) &&
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(ifa->prefered_lft == INFINITY_LIFE_TIME))) {
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preferred = ifa->prefered_lft;
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valid = ifa->valid_lft;
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preferred = READ_ONCE(ifa->prefered_lft);
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valid = READ_ONCE(ifa->valid_lft);
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if (!((flags & IFA_F_PERMANENT) &&
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(preferred == INFINITY_LIFE_TIME))) {
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if (preferred != INFINITY_LIFE_TIME) {
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long tval = (jiffies - ifa->tstamp)/HZ;
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long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
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if (preferred > tval)
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preferred -= tval;
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else
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@ -5163,28 +5168,29 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
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preferred = INFINITY_LIFE_TIME;
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valid = INFINITY_LIFE_TIME;
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}
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spin_unlock_bh(&ifa->lock);
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if (!ipv6_addr_any(&ifa->peer_addr)) {
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if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
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nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
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goto error;
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} else
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} else {
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if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
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goto error;
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}
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if (ifa->rt_priority &&
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nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
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priority = READ_ONCE(ifa->rt_priority);
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if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
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goto error;
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if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
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if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
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preferred, valid) < 0)
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goto error;
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if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
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if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
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goto error;
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if (ifa->ifa_proto &&
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nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
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proto = READ_ONCE(ifa->ifa_proto);
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if (proto && nla_put_u8(skb, IFA_PROTO, proto))
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goto error;
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nlmsg_end(skb, nlh);
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@ -5195,12 +5201,13 @@ error:
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return -EMSGSIZE;
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}
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static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
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static int inet6_fill_ifmcaddr(struct sk_buff *skb,
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const struct ifmcaddr6 *ifmca,
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struct inet6_fill_args *args)
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{
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struct nlmsghdr *nlh;
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u8 scope = RT_SCOPE_UNIVERSE;
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int ifindex = ifmca->idev->dev->ifindex;
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u8 scope = RT_SCOPE_UNIVERSE;
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struct nlmsghdr *nlh;
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if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
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scope = RT_SCOPE_SITE;
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@ -5218,7 +5225,7 @@ static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
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put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
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if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
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put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
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put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
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INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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@ -5228,13 +5235,14 @@ static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
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return 0;
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}
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static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
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static int inet6_fill_ifacaddr(struct sk_buff *skb,
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const struct ifacaddr6 *ifaca,
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struct inet6_fill_args *args)
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{
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struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
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int ifindex = dev ? dev->ifindex : 1;
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struct nlmsghdr *nlh;
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u8 scope = RT_SCOPE_UNIVERSE;
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struct nlmsghdr *nlh;
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if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
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scope = RT_SCOPE_SITE;
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@ -5252,7 +5260,7 @@ static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
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put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
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if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
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put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
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put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
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INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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@ -5263,24 +5271,23 @@ static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
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}
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/* called with rcu_read_lock() */
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static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
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struct netlink_callback *cb, int s_ip_idx,
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static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
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struct netlink_callback *cb, int *s_ip_idx,
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struct inet6_fill_args *fillargs)
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{
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struct ifmcaddr6 *ifmca;
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struct ifacaddr6 *ifaca;
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const struct ifmcaddr6 *ifmca;
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const struct ifacaddr6 *ifaca;
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int ip_idx = 0;
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int err = 1;
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int err = 0;
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read_lock_bh(&idev->lock);
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switch (fillargs->type) {
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case UNICAST_ADDR: {
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struct inet6_ifaddr *ifa;
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const struct inet6_ifaddr *ifa;
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fillargs->event = RTM_NEWADDR;
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/* unicast address incl. temp addr */
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list_for_each_entry(ifa, &idev->addr_list, if_list) {
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if (ip_idx < s_ip_idx)
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list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
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if (ip_idx < *s_ip_idx)
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goto next;
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err = inet6_fill_ifaddr(skb, ifa, fillargs);
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if (err < 0)
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@ -5292,27 +5299,25 @@ next:
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break;
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}
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case MULTICAST_ADDR:
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read_unlock_bh(&idev->lock);
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fillargs->event = RTM_GETMULTICAST;
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/* multicast address */
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for (ifmca = rcu_dereference(idev->mc_list);
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ifmca;
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ifmca = rcu_dereference(ifmca->next), ip_idx++) {
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if (ip_idx < s_ip_idx)
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if (ip_idx < *s_ip_idx)
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continue;
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err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
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if (err < 0)
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break;
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}
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read_lock_bh(&idev->lock);
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break;
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case ANYCAST_ADDR:
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fillargs->event = RTM_GETANYCAST;
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/* anycast address */
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for (ifaca = rcu_dereference(idev->ac_list); ifaca;
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ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
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if (ip_idx < s_ip_idx)
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if (ip_idx < *s_ip_idx)
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continue;
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err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
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if (err < 0)
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@ -5322,8 +5327,7 @@ next:
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default:
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break;
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}
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read_unlock_bh(&idev->lock);
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cb->args[2] = ip_idx;
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*s_ip_idx = err ? ip_idx : 0;
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return err;
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}
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@ -5386,6 +5390,7 @@ static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
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static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
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enum addr_type_t type)
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{
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struct net *tgt_net = sock_net(skb->sk);
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const struct nlmsghdr *nlh = cb->nlh;
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struct inet6_fill_args fillargs = {
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.portid = NETLINK_CB(cb->skb).portid,
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@ -5394,72 +5399,52 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
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.netnsid = -1,
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.type = type,
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};
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struct net *tgt_net = sock_net(skb->sk);
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int idx, s_idx, s_ip_idx;
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int h, s_h;
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struct {
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unsigned long ifindex;
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int ip_idx;
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} *ctx = (void *)cb->ctx;
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struct net_device *dev;
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struct inet6_dev *idev;
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struct hlist_head *head;
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int err = 0;
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s_h = cb->args[0];
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s_idx = idx = cb->args[1];
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s_ip_idx = cb->args[2];
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rcu_read_lock();
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if (cb->strict_check) {
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err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
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skb->sk, cb);
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if (err < 0)
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goto put_tgt_net;
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goto done;
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err = 0;
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if (fillargs.ifindex) {
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dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
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if (!dev) {
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err = -ENODEV;
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goto put_tgt_net;
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}
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dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
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if (!dev)
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goto done;
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idev = __in6_dev_get(dev);
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if (idev) {
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err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
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if (idev)
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err = in6_dump_addrs(idev, skb, cb,
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&ctx->ip_idx,
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&fillargs);
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if (err > 0)
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err = 0;
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}
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goto put_tgt_net;
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goto done;
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}
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}
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cb->seq = inet6_base_seq(tgt_net);
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for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
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idx = 0;
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head = &tgt_net->dev_index_head[h];
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hlist_for_each_entry_rcu(dev, head, index_hlist) {
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if (idx < s_idx)
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goto cont;
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if (h > s_h || idx > s_idx)
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s_ip_idx = 0;
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for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
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idev = __in6_dev_get(dev);
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if (!idev)
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goto cont;
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if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
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&fillargs) < 0)
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continue;
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err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
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&fillargs);
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if (err < 0)
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goto done;
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cont:
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idx++;
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}
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}
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done:
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cb->args[0] = h;
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cb->args[1] = idx;
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put_tgt_net:
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rcu_read_unlock();
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if (fillargs.netnsid >= 0)
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put_net(tgt_net);
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return skb->len ? : err;
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return err;
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}
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static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
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@ -7469,15 +7454,18 @@ int __init addrconf_init(void)
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goto errout;
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err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
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inet6_rtm_getaddr, inet6_dump_ifaddr,
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RTNL_FLAG_DOIT_UNLOCKED);
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RTNL_FLAG_DOIT_UNLOCKED |
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RTNL_FLAG_DUMP_UNLOCKED);
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if (err < 0)
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goto errout;
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err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
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NULL, inet6_dump_ifmcaddr, 0);
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NULL, inet6_dump_ifmcaddr,
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RTNL_FLAG_DUMP_UNLOCKED);
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if (err < 0)
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goto errout;
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err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
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NULL, inet6_dump_ifacaddr, 0);
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NULL, inet6_dump_ifacaddr,
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RTNL_FLAG_DUMP_UNLOCKED);
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if (err < 0)
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goto errout;
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err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
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