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nexthop: Add support for IPv4 nexthops
Add support for IPv4 nexthops. If nh_family is set to AF_INET, then NHA_GATEWAY is expected to be an IPv4 address. Register for netdev events to be notified of admin up/down changes as well as deletes. A hash table is used to track nexthop per devices to quickly convert device events to the affected nexthops. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
David S. Miller
parent
ab84be7e54
commit
597cfe4fc3
@ -29,6 +29,10 @@ struct nh_config {
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int nh_ifindex;
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struct net_device *dev;
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union {
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__be32 ipv4;
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} gw;
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u32 nlflags;
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struct nl_info nlinfo;
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};
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@ -42,6 +46,7 @@ struct nh_info {
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union {
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struct fib_nh_common fib_nhc;
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struct fib_nh fib_nh;
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};
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};
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@ -9,8 +9,12 @@
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <net/nexthop.h>
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#include <net/route.h>
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#include <net/sock.h>
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#define NH_DEV_HASHBITS 8
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#define NH_DEV_HASHSIZE (1U << NH_DEV_HASHBITS)
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static const struct nla_policy rtm_nh_policy[NHA_MAX + 1] = {
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[NHA_UNSPEC] = { .strict_start_type = NHA_UNSPEC + 1 },
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[NHA_ID] = { .type = NLA_U32 },
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@ -25,12 +29,39 @@ static const struct nla_policy rtm_nh_policy[NHA_MAX + 1] = {
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[NHA_MASTER] = { .type = NLA_U32 },
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};
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static unsigned int nh_dev_hashfn(unsigned int val)
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{
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unsigned int mask = NH_DEV_HASHSIZE - 1;
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return (val ^
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(val >> NH_DEV_HASHBITS) ^
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(val >> (NH_DEV_HASHBITS * 2))) & mask;
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}
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static void nexthop_devhash_add(struct net *net, struct nh_info *nhi)
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{
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struct net_device *dev = nhi->fib_nhc.nhc_dev;
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struct hlist_head *head;
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unsigned int hash;
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WARN_ON(!dev);
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hash = nh_dev_hashfn(dev->ifindex);
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head = &net->nexthop.devhash[hash];
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hlist_add_head(&nhi->dev_hash, head);
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}
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void nexthop_free_rcu(struct rcu_head *head)
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{
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struct nexthop *nh = container_of(head, struct nexthop, rcu);
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struct nh_info *nhi;
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nhi = rcu_dereference_raw(nh->nh_info);
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switch (nhi->family) {
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case AF_INET:
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fib_nh_release(nh->net, &nhi->fib_nh);
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break;
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}
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kfree(nhi);
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kfree(nh);
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@ -96,6 +127,7 @@ static u32 nh_find_unused_id(struct net *net)
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static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh,
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int event, u32 portid, u32 seq, unsigned int nlflags)
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{
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struct fib_nh *fib_nh;
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struct nlmsghdr *nlh;
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struct nh_info *nhi;
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struct nhmsg *nhm;
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@ -120,6 +152,22 @@ static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh,
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if (nla_put_flag(skb, NHA_BLACKHOLE))
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goto nla_put_failure;
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goto out;
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} else {
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const struct net_device *dev;
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dev = nhi->fib_nhc.nhc_dev;
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if (dev && nla_put_u32(skb, NHA_OIF, dev->ifindex))
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goto nla_put_failure;
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}
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nhm->nh_scope = nhi->fib_nhc.nhc_scope;
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switch (nhi->family) {
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case AF_INET:
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fib_nh = &nhi->fib_nh;
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if (fib_nh->fib_nh_gw_family &&
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nla_put_u32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4))
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goto nla_put_failure;
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break;
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}
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out:
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@ -132,6 +180,7 @@ nla_put_failure:
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static size_t nh_nlmsg_size(struct nexthop *nh)
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{
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struct nh_info *nhi = rtnl_dereference(nh->nh_info);
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size_t sz = nla_total_size(4); /* NHA_ID */
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/* covers NHA_BLACKHOLE since NHA_OIF and BLACKHOLE
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@ -139,6 +188,13 @@ static size_t nh_nlmsg_size(struct nexthop *nh)
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*/
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sz += nla_total_size(4); /* NHA_OIF */
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switch (nhi->family) {
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case AF_INET:
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if (nhi->fib_nh.fib_nh_gw_family)
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sz += nla_total_size(4); /* NHA_GATEWAY */
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break;
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}
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return sz;
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}
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@ -169,6 +225,15 @@ errout:
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rtnl_set_sk_err(info->nl_net, RTNLGRP_NEXTHOP, err);
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}
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static void __remove_nexthop(struct net *net, struct nexthop *nh)
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{
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struct nh_info *nhi;
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nhi = rtnl_dereference(nh->nh_info);
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if (nhi->fib_nhc.nhc_dev)
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hlist_del(&nhi->dev_hash);
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}
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static void remove_nexthop(struct net *net, struct nexthop *nh,
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bool skip_fib, struct nl_info *nlinfo)
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{
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@ -178,6 +243,7 @@ static void remove_nexthop(struct net *net, struct nexthop *nh,
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if (nlinfo)
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nexthop_notify(RTM_DELNEXTHOP, nh, nlinfo);
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__remove_nexthop(net, nh);
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nh_base_seq_inc(net);
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nexthop_put(nh);
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@ -244,6 +310,24 @@ out:
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return rc;
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}
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/* rtnl */
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/* remove all nexthops tied to a device being deleted */
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static void nexthop_flush_dev(struct net_device *dev)
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{
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unsigned int hash = nh_dev_hashfn(dev->ifindex);
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struct net *net = dev_net(dev);
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struct hlist_head *head = &net->nexthop.devhash[hash];
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struct hlist_node *n;
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struct nh_info *nhi;
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hlist_for_each_entry_safe(nhi, n, head, dev_hash) {
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if (nhi->fib_nhc.nhc_dev != dev)
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continue;
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remove_nexthop(net, nhi->nh_parent, false, NULL);
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}
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}
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/* rtnl; called when net namespace is deleted */
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static void flush_all_nexthops(struct net *net)
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{
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@ -258,6 +342,38 @@ static void flush_all_nexthops(struct net *net)
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}
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}
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static int nh_create_ipv4(struct net *net, struct nexthop *nh,
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struct nh_info *nhi, struct nh_config *cfg,
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struct netlink_ext_ack *extack)
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{
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struct fib_nh *fib_nh = &nhi->fib_nh;
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struct fib_config fib_cfg = {
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.fc_oif = cfg->nh_ifindex,
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.fc_gw4 = cfg->gw.ipv4,
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.fc_gw_family = cfg->gw.ipv4 ? AF_INET : 0,
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.fc_flags = cfg->nh_flags,
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};
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u32 tb_id = l3mdev_fib_table(cfg->dev);
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int err = -EINVAL;
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err = fib_nh_init(net, fib_nh, &fib_cfg, 1, extack);
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if (err) {
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fib_nh_release(net, fib_nh);
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goto out;
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}
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/* sets nh_dev if successful */
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err = fib_check_nh(net, fib_nh, tb_id, 0, extack);
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if (!err) {
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nh->nh_flags = fib_nh->fib_nh_flags;
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fib_info_update_nh_saddr(net, fib_nh, fib_nh->fib_nh_scope);
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} else {
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fib_nh_release(net, fib_nh);
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}
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out:
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return err;
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}
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static struct nexthop *nexthop_create(struct net *net, struct nh_config *cfg,
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struct netlink_ext_ack *extack)
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{
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@ -287,12 +403,21 @@ static struct nexthop *nexthop_create(struct net *net, struct nh_config *cfg,
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cfg->nh_ifindex = net->loopback_dev->ifindex;
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}
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switch (cfg->nh_family) {
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case AF_INET:
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err = nh_create_ipv4(net, nh, nhi, cfg, extack);
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break;
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}
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if (err) {
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kfree(nhi);
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kfree(nh);
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return ERR_PTR(err);
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}
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/* add the entry to the device based hash */
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nexthop_devhash_add(net, nhi);
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rcu_assign_pointer(nh->nh_info, nhi);
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return nh;
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@ -329,6 +454,7 @@ static struct nexthop *nexthop_add(struct net *net, struct nh_config *cfg,
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err = insert_nexthop(net, nh, cfg, extack);
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if (err) {
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__remove_nexthop(net, nh);
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nexthop_put(nh);
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nh = ERR_PTR(err);
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}
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@ -360,6 +486,8 @@ static int rtm_to_nh_config(struct net *net, struct sk_buff *skb,
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}
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switch (nhm->nh_family) {
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case AF_INET:
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break;
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default:
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NL_SET_ERR_MSG(extack, "Invalid address family");
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goto out;
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@ -416,6 +544,32 @@ static int rtm_to_nh_config(struct net *net, struct sk_buff *skb,
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goto out;
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}
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err = -EINVAL;
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if (tb[NHA_GATEWAY]) {
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struct nlattr *gwa = tb[NHA_GATEWAY];
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switch (cfg->nh_family) {
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case AF_INET:
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if (nla_len(gwa) != sizeof(u32)) {
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NL_SET_ERR_MSG(extack, "Invalid gateway");
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goto out;
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}
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cfg->gw.ipv4 = nla_get_be32(gwa);
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break;
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default:
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NL_SET_ERR_MSG(extack,
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"Unknown address family for gateway");
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goto out;
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}
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} else {
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/* device only nexthop (no gateway) */
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if (cfg->nh_flags & RTNH_F_ONLINK) {
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NL_SET_ERR_MSG(extack,
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"ONLINK flag can not be set for nexthop without a gateway");
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goto out;
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}
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}
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err = 0;
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out:
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return err;
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@ -683,16 +837,68 @@ out_err:
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return err;
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}
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static void nexthop_sync_mtu(struct net_device *dev, u32 orig_mtu)
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{
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unsigned int hash = nh_dev_hashfn(dev->ifindex);
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struct net *net = dev_net(dev);
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struct hlist_head *head = &net->nexthop.devhash[hash];
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struct hlist_node *n;
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struct nh_info *nhi;
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hlist_for_each_entry_safe(nhi, n, head, dev_hash) {
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if (nhi->fib_nhc.nhc_dev == dev) {
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if (nhi->family == AF_INET)
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fib_nhc_update_mtu(&nhi->fib_nhc, dev->mtu,
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orig_mtu);
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}
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}
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}
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/* rtnl */
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static int nh_netdev_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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struct netdev_notifier_info_ext *info_ext;
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switch (event) {
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case NETDEV_DOWN:
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case NETDEV_UNREGISTER:
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nexthop_flush_dev(dev);
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break;
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case NETDEV_CHANGE:
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if (!(dev_get_flags(dev) & (IFF_RUNNING | IFF_LOWER_UP)))
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nexthop_flush_dev(dev);
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break;
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case NETDEV_CHANGEMTU:
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info_ext = ptr;
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nexthop_sync_mtu(dev, info_ext->ext.mtu);
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rt_cache_flush(dev_net(dev));
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block nh_netdev_notifier = {
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.notifier_call = nh_netdev_event,
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};
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static void __net_exit nexthop_net_exit(struct net *net)
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{
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rtnl_lock();
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flush_all_nexthops(net);
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rtnl_unlock();
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kfree(net->nexthop.devhash);
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}
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static int __net_init nexthop_net_init(struct net *net)
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{
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size_t sz = sizeof(struct hlist_head) * NH_DEV_HASHSIZE;
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net->nexthop.rb_root = RB_ROOT;
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net->nexthop.devhash = kzalloc(sz, GFP_KERNEL);
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if (!net->nexthop.devhash)
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return -ENOMEM;
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return 0;
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}
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@ -706,6 +912,8 @@ static int __init nexthop_init(void)
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{
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register_pernet_subsys(&nexthop_net_ops);
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register_netdevice_notifier(&nh_netdev_notifier);
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rtnl_register(PF_UNSPEC, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
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rtnl_register(PF_UNSPEC, RTM_DELNEXTHOP, rtm_del_nexthop, NULL, 0);
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rtnl_register(PF_UNSPEC, RTM_GETNEXTHOP, rtm_get_nexthop,
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