ipv4: support for fib route lwtunnel encap attributes

This patch adds support in ipv4 fib functions to parse user
provided encap attributes and attach encap state data to fib_nh
and rtable.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 49c142b..5e01960 100644 (file)
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -44,7 +44,9 @@ struct fib_config {
        u32                     fc_flow;
        u32                     fc_nlflags;
        struct nl_info          fc_nlinfo;
- };
+       struct nlattr           *fc_encap;
+       u16                     fc_encap_type;
+};
 
 struct fib_info;
 struct rtable;
@@ -89,6 +91,7 @@ struct fib_nh {
        struct rtable __rcu * __percpu *nh_pcpu_rth_output;
        struct rtable __rcu     *nh_rth_input;
        struct fnhe_hash_bucket __rcu *nh_exceptions;
+       struct lwtunnel_state   *nh_lwtstate;
 };
 
 /*

diff --git a/include/net/route.h b/include/net/route.h
index fe22d03..2d45f41 100644 (file)
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -66,6 +66,7 @@ struct rtable {
 
        struct list_head        rt_uncached;
        struct uncached_list    *rt_uncached_list;
+       struct lwtunnel_state   *rt_lwtstate;
 };
 
 static inline bool rt_is_input_route(const struct rtable *rt)

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 6bbc549..9b2019c 100644 (file)
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -591,6 +591,8 @@ const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
        [RTA_METRICS]           = { .type = NLA_NESTED },
        [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
        [RTA_FLOW]              = { .type = NLA_U32 },
+       [RTA_ENCAP_TYPE]        = { .type = NLA_U16 },
+       [RTA_ENCAP]             = { .type = NLA_NESTED },
 };
 
 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
@@ -656,6 +658,12 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
                case RTA_TABLE:
                        cfg->fc_table = nla_get_u32(attr);
                        break;
+               case RTA_ENCAP:
+                       cfg->fc_encap = attr;
+                       break;
+               case RTA_ENCAP_TYPE:
+                       cfg->fc_encap_type = nla_get_u16(attr);
+                       break;
                }
        }
 

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index c7358ea..6754c64 100644 (file)
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -42,6 +42,7 @@
 #include <net/ip_fib.h>
 #include <net/netlink.h>
 #include <net/nexthop.h>
+#include <net/lwtunnel.h>
 
 #include "fib_lookup.h"
 
@@ -208,6 +209,7 @@ static void free_fib_info_rcu(struct rcu_head *head)
        change_nexthops(fi) {
                if (nexthop_nh->nh_dev)
                        dev_put(nexthop_nh->nh_dev);
+               lwtunnel_state_put(nexthop_nh->nh_lwtstate);
                free_nh_exceptions(nexthop_nh);
                rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output);
                rt_fibinfo_free(&nexthop_nh->nh_rth_input);
@@ -266,6 +268,7 @@ static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
 #ifdef CONFIG_IP_ROUTE_CLASSID
                    nh->nh_tclassid != onh->nh_tclassid ||
 #endif
+                   lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) ||
                    ((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK))
                        return -1;
                onh++;
@@ -366,6 +369,7 @@ static inline size_t fib_nlmsg_size(struct fib_info *fi)
        payload += nla_total_size((RTAX_MAX * nla_total_size(4)));
 
        if (fi->fib_nhs) {
+               size_t nh_encapsize = 0;
                /* Also handles the special case fib_nhs == 1 */
 
                /* each nexthop is packed in an attribute */
@@ -374,8 +378,21 @@ static inline size_t fib_nlmsg_size(struct fib_info *fi)
                /* may contain flow and gateway attribute */
                nhsize += 2 * nla_total_size(4);
 
+               /* grab encap info */
+               for_nexthops(fi) {
+                       if (nh->nh_lwtstate) {
+                               /* RTA_ENCAP_TYPE */
+                               nh_encapsize += lwtunnel_get_encap_size(
+                                               nh->nh_lwtstate);
+                               /* RTA_ENCAP */
+                               nh_encapsize +=  nla_total_size(2);
+                       }
+               } endfor_nexthops(fi);
+
                /* all nexthops are packed in a nested attribute */
-               payload += nla_total_size(fi->fib_nhs * nhsize);
+               payload += nla_total_size((fi->fib_nhs * nhsize) +
+                                         nh_encapsize);
+
        }
 
        return payload;
@@ -452,6 +469,9 @@ static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining)
 static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
                       int remaining, struct fib_config *cfg)
 {
+       struct net *net = cfg->fc_nlinfo.nl_net;
+       int ret;
+
        change_nexthops(fi) {
                int attrlen;
 
@@ -475,18 +495,66 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
                        if (nexthop_nh->nh_tclassid)
                                fi->fib_net->ipv4.fib_num_tclassid_users++;
 #endif
+                       nla = nla_find(attrs, attrlen, RTA_ENCAP);
+                       if (nla) {
+                               struct lwtunnel_state *lwtstate;
+                               struct net_device *dev = NULL;
+                               struct nlattr *nla_entype;
+
+                               nla_entype = nla_find(attrs, attrlen,
+                                                     RTA_ENCAP_TYPE);
+                               if (!nla_entype)
+                                       goto err_inval;
+                               if (cfg->fc_oif)
+                                       dev = __dev_get_by_index(net, cfg->fc_oif);
+                               ret = lwtunnel_build_state(dev, nla_get_u16(
+                                                          nla_entype),
+                                                          nla, &lwtstate);
+                               if (ret)
+                                       goto errout;
+                               lwtunnel_state_get(lwtstate);
+                               nexthop_nh->nh_lwtstate = lwtstate;
+                       }
                }
 
                rtnh = rtnh_next(rtnh, &remaining);
        } endfor_nexthops(fi);
 
        return 0;
+
+err_inval:
+       ret = -EINVAL;
+
+errout:
+       return ret;
 }
 
 #endif
 
+int fib_encap_match(struct net *net, u16 encap_type,
+                   struct nlattr *encap,
+                   int oif, const struct fib_nh *nh)
+{
+       struct lwtunnel_state *lwtstate;
+       struct net_device *dev = NULL;
+       int ret;
+
+       if (encap_type == LWTUNNEL_ENCAP_NONE)
+               return 0;
+
+       if (oif)
+               dev = __dev_get_by_index(net, oif);
+       ret = lwtunnel_build_state(dev, encap_type,
+                                  encap, &lwtstate);
+       if (!ret)
+               return lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate);
+
+       return 0;
+}
+
 int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
 {
+       struct net *net = cfg->fc_nlinfo.nl_net;
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
        struct rtnexthop *rtnh;
        int remaining;
@@ -496,6 +564,12 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
                return 1;
 
        if (cfg->fc_oif || cfg->fc_gw) {
+               if (cfg->fc_encap) {
+                       if (fib_encap_match(net, cfg->fc_encap_type,
+                                           cfg->fc_encap, cfg->fc_oif,
+                                           fi->fib_nh))
+                           return 1;
+               }
                if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) &&
                    (!cfg->fc_gw  || cfg->fc_gw == fi->fib_nh->nh_gw))
                        return 0;
@@ -882,6 +956,22 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
        } else {
                struct fib_nh *nh = fi->fib_nh;
 
+               if (cfg->fc_encap) {
+                       struct lwtunnel_state *lwtstate;
+                       struct net_device *dev = NULL;
+
+                       if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE)
+                               goto err_inval;
+                       if (cfg->fc_oif)
+                               dev = __dev_get_by_index(net, cfg->fc_oif);
+                       err = lwtunnel_build_state(dev, cfg->fc_encap_type,
+                                                  cfg->fc_encap, &lwtstate);
+                       if (err)
+                               goto failure;
+
+                       lwtunnel_state_get(lwtstate);
+                       nh->nh_lwtstate = lwtstate;
+               }
                nh->nh_oif = cfg->fc_oif;
                nh->nh_gw = cfg->fc_gw;
                nh->nh_flags = cfg->fc_flags;
@@ -1055,6 +1145,8 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
                    nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid))
                        goto nla_put_failure;
 #endif
+               if (fi->fib_nh->nh_lwtstate)
+                       lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate);
        }
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
        if (fi->fib_nhs > 1) {
@@ -1090,6 +1182,8 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
                            nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid))
                                goto nla_put_failure;
 #endif
+                       if (nh->nh_lwtstate)
+                               lwtunnel_fill_encap(skb, nh->nh_lwtstate);
                        /* length of rtnetlink header + attributes */
                        rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh;
                } endfor_nexthops(fi);

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 04c83de..226570b 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -102,6 +102,7 @@
 #include <net/tcp.h>
 #include <net/icmp.h>
 #include <net/xfrm.h>
+#include <net/lwtunnel.h>
 #include <net/netevent.h>
 #include <net/rtnetlink.h>
 #ifdef CONFIG_SYSCTL
@@ -1355,6 +1356,7 @@ static void ipv4_dst_destroy(struct dst_entry *dst)
                list_del(&rt->rt_uncached);
                spin_unlock_bh(&ul->lock);
        }
+       lwtunnel_state_put(rt->rt_lwtstate);
 }
 
 void rt_flush_dev(struct net_device *dev)
@@ -1403,6 +1405,12 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
 #ifdef CONFIG_IP_ROUTE_CLASSID
                rt->dst.tclassid = nh->nh_tclassid;
 #endif
+               if (nh->nh_lwtstate) {
+                       lwtunnel_state_get(nh->nh_lwtstate);
+                       rt->rt_lwtstate = nh->nh_lwtstate;
+               } else {
+                       rt->rt_lwtstate = NULL;
+               }
                if (unlikely(fnhe))
                        cached = rt_bind_exception(rt, fnhe, daddr);
                else if (!(rt->dst.flags & DST_NOCACHE))
@@ -1488,6 +1496,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
        rth->rt_gateway = 0;
        rth->rt_uses_gateway = 0;
        INIT_LIST_HEAD(&rth->rt_uncached);
+       rth->rt_lwtstate = NULL;
        if (our) {
                rth->dst.input= ip_local_deliver;
                rth->rt_flags |= RTCF_LOCAL;
@@ -1617,6 +1626,7 @@ static int __mkroute_input(struct sk_buff *skb,
        rth->rt_gateway = 0;
        rth->rt_uses_gateway = 0;
        INIT_LIST_HEAD(&rth->rt_uncached);
+       rth->rt_lwtstate = NULL;
        RT_CACHE_STAT_INC(in_slow_tot);
 
        rth->dst.input = ip_forward;
@@ -1791,6 +1801,8 @@ local_input:
        rth->rt_gateway = 0;
        rth->rt_uses_gateway = 0;
        INIT_LIST_HEAD(&rth->rt_uncached);
+       rth->rt_lwtstate = NULL;
+
        RT_CACHE_STAT_INC(in_slow_tot);
        if (res.type == RTN_UNREACHABLE) {
                rth->dst.input= ip_error;
@@ -1980,7 +1992,7 @@ add:
        rth->rt_gateway = 0;
        rth->rt_uses_gateway = 0;
        INIT_LIST_HEAD(&rth->rt_uncached);
-
+       rth->rt_lwtstate = NULL;
        RT_CACHE_STAT_INC(out_slow_tot);
 
        if (flags & RTCF_LOCAL)
@@ -2260,7 +2272,7 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
                rt->rt_uses_gateway = ort->rt_uses_gateway;
 
                INIT_LIST_HEAD(&rt->rt_uncached);
-
+               rt->rt_lwtstate = NULL;
                dst_free(new);
        }