Commit eba618ab authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

ipv4: Add fib_nh_common to fib_result 



Most of the ipv4 code only needs data from fib_nh_common. Add
fib_nh_common selection to fib_result and update users to use it.

Right now, fib_nh_common in fib_result will point to a fib_nh struct
that is embedded within a fib_info:

        fib_info  --> fib_nh
                      fib_nh
                      ...
                      fib_nh
                        ^
    fib_result->nhc ----+

Later, nhc can point to a fib_nh within a nexthop struct:

        fib_info --> nexthop --> fib_nh
                                   ^
    fib_result->nhc ---------------+

or for a nexthop group:

        fib_info --> nexthop --> nexthop --> fib_nh
                                 nexthop --> fib_nh
                                 ...
                                 nexthop --> fib_nh
                                               ^
    fib_result->nhc ---------------------------+

In all cases nhsel within fib_result will point to which leg in the
multipath route is used.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0af7e7c1

include/net/ip_fib.h

+21 −26
Original line number Diff line number Diff line
@@ -162,6 +162,7 @@ struct fib_result { 
	unsigned char		type;

	unsigned char		scope;

	u32			tclassid;

	struct fib_nh_common	*nhc;

	struct fib_info		*fi;

	struct fib_table	*table;

	struct hlist_head	*fa_head;
@@ -182,11 +183,10 @@ struct fib_result_nl { 
	int             err;

};



#ifdef CONFIG_IP_ROUTE_MULTIPATH

#define FIB_RES_NH(res)		((res).fi->fib_nh[(res).nh_sel])

#else /* CONFIG_IP_ROUTE_MULTIPATH */

#define FIB_RES_NH(res)		((res).fi->fib_nh[0])

#endif /* CONFIG_IP_ROUTE_MULTIPATH */

static inline struct fib_nh_common *fib_info_nhc(struct fib_info *fi, int nhsel)

{

	return &fi->fib_nh[nhsel].nh_common;

}



#ifdef CONFIG_IP_MULTIPLE_TABLES

#define FIB_TABLE_HASHSZ 256
@@ -195,18 +195,11 @@ struct fib_result_nl { 
#endif



__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);

__be32 fib_result_prefsrc(struct net *net, struct fib_result *res);



#define FIB_RES_SADDR(net, res)				\

	((FIB_RES_NH(res).nh_saddr_genid ==		\

	  atomic_read(&(net)->ipv4.dev_addr_genid)) ?	\

	 FIB_RES_NH(res).nh_saddr :			\

	 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))

#define FIB_RES_GW(res)			(FIB_RES_NH(res).fib_nh_gw4)

#define FIB_RES_DEV(res)		(FIB_RES_NH(res).fib_nh_dev)

#define FIB_RES_OIF(res)		(FIB_RES_NH(res).fib_nh_oif)



#define FIB_RES_PREFSRC(net, res)	((res).fi->fib_prefsrc ? : \

					 FIB_RES_SADDR(net, res))

#define FIB_RES_NHC(res)		((res).nhc)

#define FIB_RES_DEV(res)	(FIB_RES_NHC(res)->nhc_dev)

#define FIB_RES_OIF(res)	(FIB_RES_NHC(res)->nhc_oif)



struct fib_entry_notifier_info {

	struct fib_notifier_info info; /* must be first */
@@ -453,10 +446,12 @@ struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); 
static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)

{

#ifdef CONFIG_IP_ROUTE_CLASSID

	struct fib_nh_common *nhc = res->nhc;

	struct fib_nh *nh = container_of(nhc, struct fib_nh, nh_common);

#ifdef CONFIG_IP_MULTIPLE_TABLES

	u32 rtag;

#endif

	*itag = FIB_RES_NH(*res).nh_tclassid<<16;

	*itag = nh->nh_tclassid << 16;

#ifdef CONFIG_IP_MULTIPLE_TABLES

	rtag = res->tclassid;

	if (*itag == 0)

net/core/filter.c

+6 −6
Original line number Diff line number Diff line
@@ -4555,11 +4555,11 @@ static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, 
static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params,

			       u32 flags, bool check_mtu)

{

	struct fib_nh_common *nhc;

	struct in_device *in_dev;

	struct neighbour *neigh;

	struct net_device *dev;

	struct fib_result res;

	struct fib_nh *nh;

	struct flowi4 fl4;

	int err;

	u32 mtu;
@@ -4632,15 +4632,15 @@ static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 
			return BPF_FIB_LKUP_RET_FRAG_NEEDED;

	}



	nh = &res.fi->fib_nh[res.nh_sel];

	nhc = res.nhc;



	/* do not handle lwt encaps right now */

	if (nh->fib_nh_lws)

	if (nhc->nhc_lwtstate)

		return BPF_FIB_LKUP_RET_UNSUPP_LWT;



	dev = nh->fib_nh_dev;

	if (nh->fib_nh_gw4)

		params->ipv4_dst = nh->fib_nh_gw4;

	dev = nhc->nhc_dev;

	if (nhc->nhc_has_gw)

		params->ipv4_dst = nhc->nhc_gw.ipv4;



	params->rt_metric = res.fi->fib_priority;

net/ipv4/fib_frontend.c

+3 −3
Original line number Diff line number Diff line
@@ -307,7 +307,7 @@ __be32 fib_compute_spec_dst(struct sk_buff *skb) 
			.flowi4_mark = vmark ? skb->mark : 0,

		};

		if (!fib_lookup(net, &fl4, &res, 0))

			return FIB_RES_PREFSRC(net, res);

			return fib_result_prefsrc(net, &res);

	} else {

		scope = RT_SCOPE_LINK;

	}
@@ -390,7 +390,7 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 


	dev_match = fib_info_nh_uses_dev(res.fi, dev);

	if (dev_match) {

		ret = FIB_RES_NH(res).fib_nh_scope >= RT_SCOPE_HOST;

		ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST;

		return ret;

	}

	if (no_addr)
@@ -402,7 +402,7 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 
	ret = 0;

	if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {

		if (res.type == RTN_UNICAST)

			ret = FIB_RES_NH(res).fib_nh_scope >= RT_SCOPE_HOST;

			ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST;

	}

	return ret;

net/ipv4/fib_lookup.h

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ static inline void fib_result_assign(struct fib_result *res, 
{

	/* we used to play games with refcounts, but we now use RCU */

	res->fi = fi;

	res->nhc = fib_info_nhc(fi, 0);

}



struct fib_prop {

net/ipv4/fib_semantics.c

+21 −4
Original line number Diff line number Diff line
@@ -1075,6 +1075,21 @@ __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh) 
	return nh->nh_saddr;

}



__be32 fib_result_prefsrc(struct net *net, struct fib_result *res)

{

	struct fib_nh_common *nhc = res->nhc;

	struct fib_nh *nh;



	if (res->fi->fib_prefsrc)

		return res->fi->fib_prefsrc;



	nh = container_of(nhc, struct fib_nh, nh_common);

	if (nh->nh_saddr_genid == atomic_read(&net->ipv4.dev_addr_genid))

		return nh->nh_saddr;



	return fib_info_update_nh_saddr(net, nh);

}



static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc)

{

	if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst ||
@@ -1762,20 +1777,22 @@ void fib_select_multipath(struct fib_result *res, int hash) 
	struct net *net = fi->fib_net;

	bool first = false;



	for_nexthops(fi) {

	change_nexthops(fi) {

		if (net->ipv4.sysctl_fib_multipath_use_neigh) {

			if (!fib_good_nh(nh))

			if (!fib_good_nh(nexthop_nh))

				continue;

			if (!first) {

				res->nh_sel = nhsel;

				res->nhc = &nexthop_nh->nh_common;

				first = true;

			}

		}



		if (hash > atomic_read(&nh->fib_nh_upper_bound))

		if (hash > atomic_read(&nexthop_nh->fib_nh_upper_bound))

			continue;



		res->nh_sel = nhsel;

		res->nhc = &nexthop_nh->nh_common;

		return;

	} endfor_nexthops(fi);

}
@@ -1802,5 +1819,5 @@ void fib_select_path(struct net *net, struct fib_result *res, 


check_saddr:

	if (!fl4->saddr)

		fl4->saddr = FIB_RES_PREFSRC(net, *res);

		fl4->saddr = fib_result_prefsrc(net, res);

}

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