forked from mirrors/linux
ipv4: Plumb support for nexthop object in a fib_info
Add 'struct nexthop' and nh_list list_head to fib_info. nh_list is the fib_info side of the nexthop <-> fib_info relationship. Add fi_list list_head to 'struct nexthop' to track fib_info entries using a nexthop instance. Add __remove_nexthop_fib and add it to __remove_nexthop to walk the new list_head and mark those fib entries as dead when the nexthop is deleted. Add a few nexthop helpers for use when a nexthop is added to fib_info: - nexthop_cmp to determine if 2 nexthops are the same - nexthop_path_fib_result to select a path for a multipath 'struct nexthop' - nexthop_fib_nhc to select a specific fib_nh_common within a multipath 'struct nexthop' Update existing fib_info_nhc to use nexthop_fib_nhc if a fib_info uses a 'struct nexthop', and mark fib_info_nh as only used for the non-nexthop case. Update the fib_info functions to check for fi->nh and take a different path as needed: - free_fib_info_rcu - put the nexthop object reference - fib_release_info - remove the fib_info from the nexthop's fi_list - nh_comp - use nexthop_cmp when either fib_info references a nexthop object - fib_info_hashfn - use the nexthop id for the hashing vs the oif of each fib_nh in a fib_info - fib_nlmsg_size - add space for the RTA_NH_ID attribute - fib_create_info - verify nexthop reference can be taken, verify nexthop spec is valid for fib entry, and add fib_info to fi_list for a nexthop - fib_select_multipath - use the new nexthop_path_fib_result to select a path when nexthop objects are used - fib_table_lookup - if the 'struct nexthop' is a blackhole nexthop, treat it the same as a fib entry using 'blackhole' The bulk of the changes are in fib_semantics.c and most of that is moving the existing change_nexthops into an else branch. Update the nexthop code to walk fi_list on a nexthop deleted to remove fib entries referencing it. 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
dcb1ecb50e
commit
4c7e8084fd
5 changed files with 229 additions and 36 deletions
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@ -129,9 +129,12 @@ struct fib_nh {
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* This structure contains data shared by many of routes.
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*/
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struct nexthop;
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struct fib_info {
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struct hlist_node fib_hash;
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struct hlist_node fib_lhash;
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struct list_head nh_list;
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struct net *fib_net;
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int fib_treeref;
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refcount_t fib_clntref;
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@ -151,6 +154,7 @@ struct fib_info {
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int fib_nhs;
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bool fib_nh_is_v6;
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bool nh_updated;
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struct nexthop *nh;
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struct rcu_head rcu;
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struct fib_nh fib_nh[0];
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};
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@ -77,6 +77,7 @@ struct nh_group {
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struct nexthop {
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struct rb_node rb_node; /* entry on netns rbtree */
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struct list_head fi_list; /* v4 entries using nh */
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struct list_head grp_list; /* nh group entries using this nh */
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struct net *net;
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@ -110,6 +111,12 @@ static inline void nexthop_put(struct nexthop *nh)
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call_rcu(&nh->rcu, nexthop_free_rcu);
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}
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static inline bool nexthop_cmp(const struct nexthop *nh1,
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const struct nexthop *nh2)
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{
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return nh1 == nh2;
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}
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static inline bool nexthop_is_multipath(const struct nexthop *nh)
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{
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if (nh->is_group) {
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@ -193,18 +200,59 @@ static inline bool nexthop_is_blackhole(const struct nexthop *nh)
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return nhi->reject_nh;
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}
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static inline void nexthop_path_fib_result(struct fib_result *res, int hash)
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{
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struct nh_info *nhi;
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struct nexthop *nh;
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nh = nexthop_select_path(res->fi->nh, hash);
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nhi = rcu_dereference(nh->nh_info);
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res->nhc = &nhi->fib_nhc;
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}
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/* called with rcu read lock or rtnl held */
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static inline
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struct fib_nh_common *nexthop_fib_nhc(struct nexthop *nh, int nhsel)
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{
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struct nh_info *nhi;
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BUILD_BUG_ON(offsetof(struct fib_nh, nh_common) != 0);
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BUILD_BUG_ON(offsetof(struct fib6_nh, nh_common) != 0);
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if (nexthop_is_multipath(nh)) {
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nh = nexthop_mpath_select(nh, nhsel);
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if (!nh)
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return NULL;
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}
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nhi = rcu_dereference_rtnl(nh->nh_info);
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return &nhi->fib_nhc;
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}
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static inline unsigned int fib_info_num_path(const struct fib_info *fi)
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{
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if (unlikely(fi->nh))
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return nexthop_num_path(fi->nh);
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return fi->fib_nhs;
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}
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int fib_check_nexthop(struct nexthop *nh, u8 scope,
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struct netlink_ext_ack *extack);
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static inline struct fib_nh_common *fib_info_nhc(struct fib_info *fi, int nhsel)
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{
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if (unlikely(fi->nh))
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return nexthop_fib_nhc(fi->nh, nhsel);
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return &fi->fib_nh[nhsel].nh_common;
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}
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/* only used when fib_nh is built into fib_info */
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static inline struct fib_nh *fib_info_nh(struct fib_info *fi, int nhsel)
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{
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WARN_ON(fi->nh);
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return &fi->fib_nh[nhsel];
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}
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#endif
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@ -236,9 +236,13 @@ static void free_fib_info_rcu(struct rcu_head *head)
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{
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struct fib_info *fi = container_of(head, struct fib_info, rcu);
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change_nexthops(fi) {
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fib_nh_release(fi->fib_net, nexthop_nh);
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} endfor_nexthops(fi);
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if (fi->nh) {
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nexthop_put(fi->nh);
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} else {
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change_nexthops(fi) {
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fib_nh_release(fi->fib_net, nexthop_nh);
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} endfor_nexthops(fi);
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}
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ip_fib_metrics_put(fi->fib_metrics);
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@ -264,11 +268,15 @@ void fib_release_info(struct fib_info *fi)
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hlist_del(&fi->fib_hash);
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if (fi->fib_prefsrc)
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hlist_del(&fi->fib_lhash);
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change_nexthops(fi) {
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if (!nexthop_nh->fib_nh_dev)
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continue;
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hlist_del(&nexthop_nh->nh_hash);
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} endfor_nexthops(fi)
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if (fi->nh) {
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list_del(&fi->nh_list);
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} else {
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change_nexthops(fi) {
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if (!nexthop_nh->fib_nh_dev)
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continue;
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hlist_del(&nexthop_nh->nh_hash);
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} endfor_nexthops(fi)
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}
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fi->fib_dead = 1;
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fib_info_put(fi);
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}
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@ -279,6 +287,12 @@ static inline int nh_comp(struct fib_info *fi, struct fib_info *ofi)
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{
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const struct fib_nh *onh;
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if (fi->nh || ofi->nh)
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return nexthop_cmp(fi->nh, ofi->nh) ? 0 : -1;
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if (ofi->fib_nhs == 0)
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return 0;
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for_nexthops(fi) {
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onh = fib_info_nh(ofi, nhsel);
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@ -323,9 +337,14 @@ static inline unsigned int fib_info_hashfn(const struct fib_info *fi)
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val ^= (fi->fib_protocol << 8) | fi->fib_scope;
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val ^= (__force u32)fi->fib_prefsrc;
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val ^= fi->fib_priority;
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for_nexthops(fi) {
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val ^= fib_devindex_hashfn(nh->fib_nh_oif);
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} endfor_nexthops(fi)
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if (fi->nh) {
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val ^= fib_devindex_hashfn(fi->nh->id);
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} else {
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for_nexthops(fi) {
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val ^= fib_devindex_hashfn(nh->fib_nh_oif);
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} endfor_nexthops(fi)
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}
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return (val ^ (val >> 7) ^ (val >> 12)) & mask;
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}
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@ -352,7 +371,7 @@ static struct fib_info *fib_find_info(struct fib_info *nfi)
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memcmp(nfi->fib_metrics, fi->fib_metrics,
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sizeof(u32) * RTAX_MAX) == 0 &&
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!((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) &&
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(nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
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nh_comp(fi, nfi) == 0)
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return fi;
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}
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@ -399,6 +418,9 @@ static inline size_t fib_nlmsg_size(struct fib_info *fi)
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/* space for nested metrics */
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payload += nla_total_size((RTAX_MAX * nla_total_size(4)));
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if (fi->nh)
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payload += nla_total_size(4); /* RTA_NH_ID */
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if (nhs) {
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size_t nh_encapsize = 0;
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/* Also handles the special case nhs == 1 */
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@ -585,6 +607,7 @@ static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining,
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return nhs;
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}
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/* only called when fib_nh is integrated into fib_info */
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static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
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int remaining, struct fib_config *cfg,
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struct netlink_ext_ack *extack)
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@ -683,6 +706,7 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
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return ret;
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}
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/* only called when fib_nh is integrated into fib_info */
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static void fib_rebalance(struct fib_info *fi)
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{
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int total;
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@ -1262,6 +1286,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
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{
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int err;
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struct fib_info *fi = NULL;
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struct nexthop *nh = NULL;
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struct fib_info *ofi;
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int nhs = 1;
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struct net *net = cfg->fc_nlinfo.nl_net;
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@ -1333,14 +1358,25 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
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fi->fib_tb_id = cfg->fc_table;
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fi->fib_nhs = nhs;
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change_nexthops(fi) {
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nexthop_nh->nh_parent = fi;
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} endfor_nexthops(fi)
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if (nh) {
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if (!nexthop_get(nh)) {
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NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
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err = -EINVAL;
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} else {
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err = 0;
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fi->nh = nh;
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}
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} else {
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change_nexthops(fi) {
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nexthop_nh->nh_parent = fi;
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} endfor_nexthops(fi)
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if (cfg->fc_mp)
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err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg, extack);
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else
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err = fib_nh_init(net, fi->fib_nh, cfg, 1, extack);
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if (cfg->fc_mp)
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err = fib_get_nhs(fi, cfg->fc_mp, cfg->fc_mp_len, cfg,
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extack);
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else
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err = fib_nh_init(net, fi->fib_nh, cfg, 1, extack);
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}
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if (err != 0)
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goto failure;
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@ -1371,7 +1407,11 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
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goto err_inval;
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}
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if (cfg->fc_scope == RT_SCOPE_HOST) {
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if (fi->nh) {
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err = fib_check_nexthop(fi->nh, cfg->fc_scope, extack);
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if (err)
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goto failure;
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} else if (cfg->fc_scope == RT_SCOPE_HOST) {
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struct fib_nh *nh = fi->fib_nh;
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/* Local address is added. */
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@ -1411,14 +1451,16 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
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goto err_inval;
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}
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change_nexthops(fi) {
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fib_info_update_nhc_saddr(net, &nexthop_nh->nh_common,
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fi->fib_scope);
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if (nexthop_nh->fib_nh_gw_family == AF_INET6)
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fi->fib_nh_is_v6 = true;
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} endfor_nexthops(fi)
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if (!fi->nh) {
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change_nexthops(fi) {
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fib_info_update_nhc_saddr(net, &nexthop_nh->nh_common,
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fi->fib_scope);
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if (nexthop_nh->fib_nh_gw_family == AF_INET6)
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fi->fib_nh_is_v6 = true;
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} endfor_nexthops(fi)
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fib_rebalance(fi);
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fib_rebalance(fi);
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}
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link_it:
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ofi = fib_find_info(fi);
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@ -1440,16 +1482,20 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
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head = &fib_info_laddrhash[fib_laddr_hashfn(fi->fib_prefsrc)];
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hlist_add_head(&fi->fib_lhash, head);
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}
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change_nexthops(fi) {
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struct hlist_head *head;
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unsigned int hash;
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if (fi->nh) {
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list_add(&fi->nh_list, &nh->fi_list);
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} else {
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change_nexthops(fi) {
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struct hlist_head *head;
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unsigned int hash;
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if (!nexthop_nh->fib_nh_dev)
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continue;
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hash = fib_devindex_hashfn(nexthop_nh->fib_nh_dev->ifindex);
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head = &fib_info_devhash[hash];
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hlist_add_head(&nexthop_nh->nh_hash, head);
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} endfor_nexthops(fi)
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if (!nexthop_nh->fib_nh_dev)
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continue;
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hash = fib_devindex_hashfn(nexthop_nh->fib_nh_dev->ifindex);
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head = &fib_info_devhash[hash];
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hlist_add_head(&nexthop_nh->nh_hash, head);
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} endfor_nexthops(fi)
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}
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spin_unlock_bh(&fib_info_lock);
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return fi;
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@ -1576,6 +1622,12 @@ static int fib_add_multipath(struct sk_buff *skb, struct fib_info *fi)
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if (!mp)
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goto nla_put_failure;
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if (unlikely(fi->nh)) {
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if (nexthop_mpath_fill_node(skb, fi->nh) < 0)
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goto nla_put_failure;
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goto mp_end;
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}
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for_nexthops(fi) {
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if (fib_add_nexthop(skb, &nh->nh_common, nh->fib_nh_weight) < 0)
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goto nla_put_failure;
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@ -1586,6 +1638,7 @@ static int fib_add_multipath(struct sk_buff *skb, struct fib_info *fi)
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#endif
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} endfor_nexthops(fi);
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mp_end:
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nla_nest_end(skb, mp);
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return 0;
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@ -1640,6 +1693,14 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
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if (fi->fib_prefsrc &&
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nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc))
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goto nla_put_failure;
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if (fi->nh) {
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if (nla_put_u32(skb, RTA_NH_ID, fi->nh->id))
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goto nla_put_failure;
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if (nexthop_is_blackhole(fi->nh))
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rtm->rtm_type = RTN_BLACKHOLE;
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}
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if (nhs == 1) {
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const struct fib_nh_common *nhc = fib_info_nhc(fi, 0);
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unsigned char flags = 0;
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@ -1784,6 +1845,8 @@ void fib_sync_mtu(struct net_device *dev, u32 orig_mtu)
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* NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host
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* NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed
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* NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed
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*
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* only used when fib_nh is built into fib_info
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*/
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int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force)
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{
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@ -1931,6 +1994,8 @@ static void fib_select_default(const struct flowi4 *flp, struct fib_result *res)
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/*
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* Dead device goes up. We wake up dead nexthops.
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* It takes sense only on multipath routes.
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*
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* only used when fib_nh is built into fib_info
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*/
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int fib_sync_up(struct net_device *dev, unsigned char nh_flags)
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{
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@ -2025,6 +2090,11 @@ void fib_select_multipath(struct fib_result *res, int hash)
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struct net *net = fi->fib_net;
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bool first = false;
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if (unlikely(res->fi->nh)) {
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nexthop_path_fib_result(res, hash);
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return;
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}
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change_nexthops(fi) {
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if (net->ipv4.sysctl_fib_multipath_use_neigh) {
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if (!fib_good_nh(nexthop_nh))
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@ -1461,6 +1461,7 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
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fib_alias_accessed(fa);
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err = fib_props[fa->fa_type].error;
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if (unlikely(err < 0)) {
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out_reject:
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#ifdef CONFIG_IP_FIB_TRIE_STATS
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this_cpu_inc(stats->semantic_match_passed);
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#endif
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@ -1469,6 +1470,12 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
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}
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if (fi->fib_flags & RTNH_F_DEAD)
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continue;
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|
||||
if (unlikely(fi->nh && nexthop_is_blackhole(fi->nh))) {
|
||||
err = fib_props[RTN_BLACKHOLE].error;
|
||||
goto out_reject;
|
||||
}
|
||||
|
||||
for (nhsel = 0; nhsel < fib_info_num_path(fi); nhsel++) {
|
||||
struct fib_nh_common *nhc = fib_info_nhc(fi, nhsel);
|
||||
|
||||
|
|
|
|||
|
|
@ -105,6 +105,7 @@ static struct nexthop *nexthop_alloc(void)
|
|||
|
||||
nh = kzalloc(sizeof(struct nexthop), GFP_KERNEL);
|
||||
if (nh) {
|
||||
INIT_LIST_HEAD(&nh->fi_list);
|
||||
INIT_LIST_HEAD(&nh->grp_list);
|
||||
}
|
||||
return nh;
|
||||
|
|
@ -515,6 +516,54 @@ struct nexthop *nexthop_select_path(struct nexthop *nh, int hash)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(nexthop_select_path);
|
||||
|
||||
static int nexthop_check_scope(struct nexthop *nh, u8 scope,
|
||||
struct netlink_ext_ack *extack)
|
||||
{
|
||||
struct nh_info *nhi;
|
||||
|
||||
nhi = rtnl_dereference(nh->nh_info);
|
||||
if (scope == RT_SCOPE_HOST && nhi->fib_nhc.nhc_gw_family) {
|
||||
NL_SET_ERR_MSG(extack,
|
||||
"Route with host scope can not have a gateway");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (nhi->fib_nhc.nhc_flags & RTNH_F_ONLINK && scope >= RT_SCOPE_LINK) {
|
||||
NL_SET_ERR_MSG(extack, "Scope mismatch with nexthop");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Invoked by fib add code to verify nexthop by id is ok with
|
||||
* config for prefix; parts of fib_check_nh not done when nexthop
|
||||
* object is used.
|
||||
*/
|
||||
int fib_check_nexthop(struct nexthop *nh, u8 scope,
|
||||
struct netlink_ext_ack *extack)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
if (nh->is_group) {
|
||||
struct nh_group *nhg;
|
||||
|
||||
if (scope == RT_SCOPE_HOST) {
|
||||
NL_SET_ERR_MSG(extack, "Route with host scope can not have multiple nexthops");
|
||||
err = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
nhg = rtnl_dereference(nh->nh_grp);
|
||||
/* all nexthops in a group have the same scope */
|
||||
err = nexthop_check_scope(nhg->nh_entries[0].nh, scope, extack);
|
||||
} else {
|
||||
err = nexthop_check_scope(nh, scope, extack);
|
||||
}
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static void nh_group_rebalance(struct nh_group *nhg)
|
||||
{
|
||||
int total = 0;
|
||||
|
|
@ -607,9 +656,24 @@ static void remove_nexthop_group(struct nexthop *nh, struct nl_info *nlinfo)
|
|||
}
|
||||
}
|
||||
|
||||
static void __remove_nexthop_fib(struct net *net, struct nexthop *nh)
|
||||
{
|
||||
bool do_flush = false;
|
||||
struct fib_info *fi;
|
||||
|
||||
list_for_each_entry(fi, &nh->fi_list, nh_list) {
|
||||
fi->fib_flags |= RTNH_F_DEAD;
|
||||
do_flush = true;
|
||||
}
|
||||
if (do_flush)
|
||||
fib_flush(net);
|
||||
}
|
||||
|
||||
static void __remove_nexthop(struct net *net, struct nexthop *nh,
|
||||
struct nl_info *nlinfo)
|
||||
{
|
||||
__remove_nexthop_fib(net, nh);
|
||||
|
||||
if (nh->is_group) {
|
||||
remove_nexthop_group(nh, nlinfo);
|
||||
} else {
|
||||
|
|
|
|||
Loading…
Reference in a new issue