decnet: Parse netlink attributes on our own

decnet is the only subsystem left that is relying on the global
netlink attribute buffer rta_buf. It's horrible design and we
want to get rid of it.

This converts all of decnet to do implicit attribute parsing. It
also gets rid of the error prone struct dn_kern_rta.

Yes, the fib_magic() stuff is not pretty.

It's compiled tested but I need someone with appropriate hardware
to test the patch since I don't have access to it.

Cc: linux-decnet-user@lists.sourceforge.net
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/dn_fib.h b/include/net/dn_fib.h
index 1ee9d4b..74004af 100644 (file)
--- a/include/net/dn_fib.h
+++ b/include/net/dn_fib.h
@@ -1,24 +1,9 @@
 #ifndef _NET_DN_FIB_H
 #define _NET_DN_FIB_H
 
-/* WARNING: The ordering of these elements must match ordering
- *          of RTA_* rtnetlink attribute numbers.
- */
-struct dn_kern_rta {
-        void            *rta_dst;
-        void            *rta_src;
-        int             *rta_iif;
-        int             *rta_oif;
-        void            *rta_gw;
-        u32             *rta_priority;
-        void            *rta_prefsrc;
-        struct rtattr   *rta_mx;
-        struct rtattr   *rta_mp;
-        unsigned char   *rta_protoinfo;
-        u32             *rta_flow;
-        struct rta_cacheinfo *rta_ci;
-       struct rta_session *rta_sess;
-};
+#include <linux/netlink.h>
+
+extern const struct nla_policy rtm_dn_policy[];
 
 struct dn_fib_res {
        struct fib_rule *r;
@@ -93,10 +78,10 @@ struct dn_fib_table {
        u32 n;
 
        int (*insert)(struct dn_fib_table *t, struct rtmsg *r, 
-                       struct dn_kern_rta *rta, struct nlmsghdr *n, 
+                       struct nlattr *attrs[], struct nlmsghdr *n,
                        struct netlink_skb_parms *req);
        int (*delete)(struct dn_fib_table *t, struct rtmsg *r,
-                       struct dn_kern_rta *rta, struct nlmsghdr *n,
+                       struct nlattr *attrs[], struct nlmsghdr *n,
                        struct netlink_skb_parms *req);
        int (*lookup)(struct dn_fib_table *t, const struct flowidn *fld,
                        struct dn_fib_res *res);
@@ -116,13 +101,12 @@ extern void dn_fib_cleanup(void);
 extern int dn_fib_ioctl(struct socket *sock, unsigned int cmd, 
                        unsigned long arg);
 extern struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, 
-                               struct dn_kern_rta *rta, 
+                               struct nlattr *attrs[],
                                const struct nlmsghdr *nlh, int *errp);
 extern int dn_fib_semantic_match(int type, struct dn_fib_info *fi, 
                        const struct flowidn *fld,
                        struct dn_fib_res *res);
 extern void dn_fib_release_info(struct dn_fib_info *fi);
-extern __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type);
 extern void dn_fib_flush(void);
 extern void dn_fib_select_multipath(const struct flowidn *fld,
                                        struct dn_fib_res *res);

diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
index e36614e..42a8048 100644 (file)
--- a/net/decnet/dn_fib.c
+++ b/net/decnet/dn_fib.c
@@ -145,22 +145,10 @@ static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi
        return NULL;
 }
 
-__le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
+static int dn_fib_count_nhs(const struct nlattr *attr)
 {
-       while(RTA_OK(attr,attrlen)) {
-               if (attr->rta_type == type)
-                       return *(__le16*)RTA_DATA(attr);
-               attr = RTA_NEXT(attr, attrlen);
-       }
-
-       return 0;
-}
-
-static int dn_fib_count_nhs(struct rtattr *rta)
-{
-       int nhs = 0;
-       struct rtnexthop *nhp = RTA_DATA(rta);
-       int nhlen = RTA_PAYLOAD(rta);
+       struct rtnexthop *nhp = nla_data(attr);
+       int nhs = 0, nhlen = nla_len(attr);
 
        while(nhlen >= (int)sizeof(struct rtnexthop)) {
                if ((nhlen -= nhp->rtnh_len) < 0)
@@ -172,10 +160,11 @@ static int dn_fib_count_nhs(struct rtattr *rta)
        return nhs;
 }
 
-static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
+static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr,
+                         const struct rtmsg *r)
 {
-       struct rtnexthop *nhp = RTA_DATA(rta);
-       int nhlen = RTA_PAYLOAD(rta);
+       struct rtnexthop *nhp = nla_data(attr);
+       int nhlen = nla_len(attr);
 
        change_nexthops(fi) {
                int attrlen = nhlen - sizeof(struct rtnexthop);
@@ -187,7 +176,10 @@ static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, cons
                nh->nh_weight = nhp->rtnh_hops + 1;
 
                if (attrlen) {
-                       nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
+                       struct nlattr *gw_attr;
+
+                       gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
+                       nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
                }
                nhp = RTNH_NEXT(nhp);
        } endfor_nexthops(fi);
@@ -268,7 +260,8 @@ out:
 }
 
 
-struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
+struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
+                                      const struct nlmsghdr *nlh, int *errp)
 {
        int err;
        struct dn_fib_info *fi = NULL;
@@ -281,11 +274,9 @@ struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta
        if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
                goto err_inval;
 
-       if (rta->rta_mp) {
-               nhs = dn_fib_count_nhs(rta->rta_mp);
-               if (nhs == 0)
-                       goto err_inval;
-       }
+       if (attrs[RTA_MULTIPATH] &&
+           (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
+               goto err_inval;
 
        fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
        err = -ENOBUFS;
@@ -295,53 +286,65 @@ struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta
        fi->fib_protocol = r->rtm_protocol;
        fi->fib_nhs = nhs;
        fi->fib_flags = r->rtm_flags;
-       if (rta->rta_priority)
-               fi->fib_priority = *rta->rta_priority;
-       if (rta->rta_mx) {
-               int attrlen = RTA_PAYLOAD(rta->rta_mx);
-               struct rtattr *attr = RTA_DATA(rta->rta_mx);
 
-               while(RTA_OK(attr, attrlen)) {
-                       unsigned int flavour = attr->rta_type;
+       if (attrs[RTA_PRIORITY])
+               fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
+
+       if (attrs[RTA_METRICS]) {
+               struct nlattr *attr;
+               int rem;
 
-                       if (flavour) {
-                               if (flavour > RTAX_MAX)
+               nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
+                       int type = nla_type(attr);
+
+                       if (type) {
+                               if (type > RTAX_MAX || nla_len(attr) < 4)
                                        goto err_inval;
-                               fi->fib_metrics[flavour-1] = *(unsigned int *)RTA_DATA(attr);
+
+                               fi->fib_metrics[type-1] = nla_get_u32(attr);
                        }
-                       attr = RTA_NEXT(attr, attrlen);
                }
        }
-       if (rta->rta_prefsrc)
-               memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
 
-       if (rta->rta_mp) {
-               if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
+       if (attrs[RTA_PREFSRC])
+               fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
+
+       if (attrs[RTA_MULTIPATH]) {
+               if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
                        goto failure;
-               if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
+
+               if (attrs[RTA_OIF] &&
+                   fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
                        goto err_inval;
-               if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
+
+               if (attrs[RTA_GATEWAY] &&
+                   fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
                        goto err_inval;
        } else {
                struct dn_fib_nh *nh = fi->fib_nh;
-               if (rta->rta_oif)
-                       nh->nh_oif = *rta->rta_oif;
-               if (rta->rta_gw)
-                       memcpy(&nh->nh_gw, rta->rta_gw, 2);
+
+               if (attrs[RTA_OIF])
+                       nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
+
+               if (attrs[RTA_GATEWAY])
+                       nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
+
                nh->nh_flags = r->rtm_flags;
                nh->nh_weight = 1;
        }
 
        if (r->rtm_type == RTN_NAT) {
-               if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
+               if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
                        goto err_inval;
-               memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
+
+               fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
                goto link_it;
        }
 
        if (dn_fib_props[r->rtm_type].error) {
-               if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
+               if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
                        goto err_inval;
+
                goto link_it;
        }
 
@@ -367,8 +370,8 @@ struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta
        }
 
        if (fi->fib_prefsrc) {
-               if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
-                   memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
+               if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
+                   fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
                        if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
                                goto err_inval;
        }
@@ -486,29 +489,24 @@ void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
        spin_unlock_bh(&dn_fib_multipath_lock);
 }
 
+const struct nla_policy rtm_dn_policy[RTA_MAX + 1] = {
+       [RTA_DST]               = { .type = NLA_U16 },
+       [RTA_SRC]               = { .type = NLA_U16 },
+       [RTA_IIF]               = { .type = NLA_U32 },
+       [RTA_OIF]               = { .type = NLA_U32 },
+       [RTA_GATEWAY]           = { .type = NLA_U16 },
+       [RTA_PRIORITY]          = { .type = NLA_U32 },
+       [RTA_PREFSRC]           = { .type = NLA_U16 },
+       [RTA_METRICS]           = { .type = NLA_NESTED },
+       [RTA_MULTIPATH]         = { .type = NLA_NESTED },
+       [RTA_TABLE]             = { .type = NLA_U32 },
+       [RTA_MARK]              = { .type = NLA_U32 },
+};
 
-static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
-{
-       int i;
-
-       for(i = 1; i <= RTA_MAX; i++) {
-               struct rtattr *attr = rta[i-1];
-               if (attr) {
-                       if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
-                               return -EINVAL;
-                       if (i != RTA_MULTIPATH && i != RTA_METRICS &&
-                           i != RTA_TABLE)
-                               rta[i-1] = (struct rtattr *)RTA_DATA(attr);
-               }
-       }
-
-       return 0;
-}
-
-static inline u32 rtm_get_table(struct rtattr **rta, u8 table)
+static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
 {
-       if (rta[RTA_TABLE - 1])
-               table = nla_get_u32((struct nlattr *) rta[RTA_TABLE - 1]);
+       if (attrs[RTA_TABLE])
+               table = nla_get_u32(attrs[RTA_TABLE]);
 
        return table;
 }
@@ -517,8 +515,9 @@ static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *
 {
        struct net *net = sock_net(skb->sk);
        struct dn_fib_table *tb;
-       struct rtattr **rta = arg;
-       struct rtmsg *r = NLMSG_DATA(nlh);
+       struct rtmsg *r = nlmsg_data(nlh);
+       struct nlattr *attrs[RTA_MAX+1];
+       int err;
 
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;
@@ -526,22 +525,24 @@ static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *
        if (!net_eq(net, &init_net))
                return -EINVAL;
 
-       if (dn_fib_check_attr(r, rta))
-               return -EINVAL;
+       err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
+       if (err < 0)
+               return err;
 
-       tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
-       if (tb)
-               return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
+       tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
+       if (!tb)
+               return -ESRCH;
 
-       return -ESRCH;
+       return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
 }
 
 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 {
        struct net *net = sock_net(skb->sk);
        struct dn_fib_table *tb;
-       struct rtattr **rta = arg;
-       struct rtmsg *r = NLMSG_DATA(nlh);
+       struct rtmsg *r = nlmsg_data(nlh);
+       struct nlattr *attrs[RTA_MAX+1];
+       int err;
 
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;
@@ -549,14 +550,15 @@ static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *
        if (!net_eq(net, &init_net))
                return -EINVAL;
 
-       if (dn_fib_check_attr(r, rta))
-               return -EINVAL;
+       err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
+       if (err < 0)
+               return err;
 
-       tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
-       if (tb)
-               return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
+       tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
+       if (!tb)
+               return -ENOBUFS;
 
-       return -ENOBUFS;
+       return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
 }
 
 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
@@ -566,10 +568,31 @@ static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifad
                struct nlmsghdr nlh;
                struct rtmsg rtm;
        } req;
-       struct dn_kern_rta rta;
+       struct {
+               struct nlattr hdr;
+               __le16 dst;
+       } dst_attr = {
+               .dst = dst,
+       };
+       struct {
+               struct nlattr hdr;
+               __le16 prefsrc;
+       } prefsrc_attr = {
+               .prefsrc = ifa->ifa_local,
+       };
+       struct {
+               struct nlattr hdr;
+               u32 oif;
+       } oif_attr = {
+               .oif = ifa->ifa_dev->dev->ifindex,
+       };
+       struct nlattr *attrs[RTA_MAX+1] = {
+               [RTA_DST] = (struct nlattr *) &dst_attr,
+               [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
+               [RTA_OIF] = (struct nlattr *) &oif_attr,
+       };
 
        memset(&req.rtm, 0, sizeof(req.rtm));
-       memset(&rta, 0, sizeof(rta));
 
        if (type == RTN_UNICAST)
                tb = dn_fib_get_table(RT_MIN_TABLE, 1);
@@ -591,14 +614,10 @@ static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifad
        req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
        req.rtm.rtm_type = type;
 
-       rta.rta_dst = &dst;
-       rta.rta_prefsrc = &ifa->ifa_local;
-       rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
-
        if (cmd == RTM_NEWROUTE)
-               tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
+               tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
        else
-               tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
+               tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL);
 }
 
 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)

diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 5ac0e15..b4b3508 100644 (file)
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -1619,17 +1619,21 @@ errout:
 static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
 {
        struct net *net = sock_net(in_skb->sk);
-       struct rtattr **rta = arg;
        struct rtmsg *rtm = nlmsg_data(nlh);
        struct dn_route *rt = NULL;
        struct dn_skb_cb *cb;
        int err;
        struct sk_buff *skb;
        struct flowidn fld;
+       struct nlattr *tb[RTA_MAX+1];
 
        if (!net_eq(net, &init_net))
                return -EINVAL;
 
+       err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_dn_policy);
+       if (err < 0)
+               return err;
+
        memset(&fld, 0, sizeof(fld));
        fld.flowidn_proto = DNPROTO_NSP;
 
@@ -1639,12 +1643,14 @@ static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void
        skb_reset_mac_header(skb);
        cb = DN_SKB_CB(skb);
 
-       if (rta[RTA_SRC-1])
-               memcpy(&fld.saddr, RTA_DATA(rta[RTA_SRC-1]), 2);
-       if (rta[RTA_DST-1])
-               memcpy(&fld.daddr, RTA_DATA(rta[RTA_DST-1]), 2);
-       if (rta[RTA_IIF-1])
-               memcpy(&fld.flowidn_iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
+       if (tb[RTA_SRC])
+               fld.saddr = nla_get_le16(tb[RTA_SRC]);
+
+       if (tb[RTA_DST])
+               fld.daddr = nla_get_le16(tb[RTA_DST]);
+
+       if (tb[RTA_IIF])
+               fld.flowidn_iif = nla_get_u32(tb[RTA_IIF]);
 
        if (fld.flowidn_iif) {
                struct net_device *dev;
@@ -1669,10 +1675,9 @@ static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void
                if (!err && -rt->dst.error)
                        err = rt->dst.error;
        } else {
-               int oif = 0;
-               if (rta[RTA_OIF - 1])
-                       memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
-               fld.flowidn_oif = oif;
+               if (tb[RTA_OIF])
+                       fld.flowidn_oif = nla_get_u32(tb[RTA_OIF]);
+
                err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0);
        }
 

diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
index 6c2445b..fc42a0a 100644 (file)
--- a/net/decnet/dn_table.c
+++ b/net/decnet/dn_table.c
@@ -224,26 +224,27 @@ static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
 }
 
 
-static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi)
+static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr *attrs[], struct dn_fib_info *fi)
 {
        struct rtnexthop *nhp;
        int nhlen;
 
-       if (rta->rta_priority && *rta->rta_priority != fi->fib_priority)
+       if (attrs[RTA_PRIORITY] &&
+           nla_get_u32(attrs[RTA_PRIORITY]) != fi->fib_priority)
                return 1;
 
-       if (rta->rta_oif || rta->rta_gw) {
-               if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
-                   (!rta->rta_gw  || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0))
+       if (attrs[RTA_OIF] || attrs[RTA_GATEWAY]) {
+               if ((!attrs[RTA_OIF] || nla_get_u32(attrs[RTA_OIF]) == fi->fib_nh->nh_oif) &&
+                   (!attrs[RTA_GATEWAY]  || nla_get_le16(attrs[RTA_GATEWAY]) != fi->fib_nh->nh_gw))
                        return 0;
                return 1;
        }
 
-       if (rta->rta_mp == NULL)
+       if (!attrs[RTA_MULTIPATH])
                return 0;
 
-       nhp = RTA_DATA(rta->rta_mp);
-       nhlen = RTA_PAYLOAD(rta->rta_mp);
+       nhp = nla_data(attrs[RTA_MULTIPATH]);
+       nhlen = nla_len(attrs[RTA_MULTIPATH]);
 
        for_nexthops(fi) {
                int attrlen = nhlen - sizeof(struct rtnexthop);
@@ -254,7 +255,10 @@ static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern
                if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
                        return 1;
                if (attrlen) {
-                       gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
+                       struct nlattr *gw_attr;
+
+                       gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
+                       gw = gw_attr ? nla_get_le16(gw_attr) : 0;
 
                        if (gw && gw != nh->nh_gw)
                                return 1;
@@ -517,7 +521,8 @@ out:
        return skb->len;
 }
 
-static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
+static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[],
+                              struct nlmsghdr *n, struct netlink_skb_parms *req)
 {
        struct dn_hash *table = (struct dn_hash *)tb->data;
        struct dn_fib_node *new_f, *f, **fp, **del_fp;
@@ -536,15 +541,14 @@ static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct
                return -ENOBUFS;
 
        dz_key_0(key);
-       if (rta->rta_dst) {
-               __le16 dst;
-               memcpy(&dst, rta->rta_dst, 2);
+       if (attrs[RTA_DST]) {
+               __le16 dst = nla_get_le16(attrs[RTA_DST]);
                if (dst & ~DZ_MASK(dz))
                        return -EINVAL;
                key = dz_key(dst, dz);
        }
 
-       if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL)
+       if ((fi = dn_fib_create_info(r, attrs, n, &err)) == NULL)
                return err;
 
        if (dz->dz_nent > (dz->dz_divisor << 2) &&
@@ -654,7 +658,8 @@ out:
 }
 
 
-static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
+static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[],
+                              struct nlmsghdr *n, struct netlink_skb_parms *req)
 {
        struct dn_hash *table = (struct dn_hash*)tb->data;
        struct dn_fib_node **fp, **del_fp, *f;
@@ -671,9 +676,8 @@ static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct
                return -ESRCH;
 
        dz_key_0(key);
-       if (rta->rta_dst) {
-               __le16 dst;
-               memcpy(&dst, rta->rta_dst, 2);
+       if (attrs[RTA_DST]) {
+               __le16 dst = nla_get_le16(attrs[RTA_DST]);
                if (dst & ~DZ_MASK(dz))
                        return -EINVAL;
                key = dz_key(dst, dz);
@@ -703,7 +707,7 @@ static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct
                                (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
                                (!r->rtm_protocol ||
                                        fi->fib_protocol == r->rtm_protocol) &&
-                               dn_fib_nh_match(r, n, rta, fi) == 0)
+                               dn_fib_nh_match(r, n, attrs, fi) == 0)
                        del_fp = fp;
        }