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-rw-r--r--net/ipv6/route.c1221
1 files changed, 634 insertions, 587 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 0302e0eb07af..23a20d62daac 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -59,7 +59,7 @@
#include <net/xfrm.h>
#include <net/netevent.h>
#include <net/netlink.h>
-#include <net/nexthop.h>
+#include <net/rtnh.h>
#include <net/lwtunnel.h>
#include <net/ip_tunnels.h>
#include <net/l3mdev.h>
@@ -102,14 +102,15 @@ static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb, u32 mtu);
static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb);
-static int rt6_score_route(struct fib6_info *rt, int oif, int strict);
+static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
+ int strict);
static size_t rt6_nlmsg_size(struct fib6_info *rt);
static int rt6_fill_node(struct net *net, struct sk_buff *skb,
struct fib6_info *rt, struct dst_entry *dst,
struct in6_addr *dest, struct in6_addr *src,
int iif, int type, u32 portid, u32 seq,
unsigned int flags);
-static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
+static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
struct in6_addr *daddr,
struct in6_addr *saddr);
@@ -295,7 +296,7 @@ static const struct fib6_info fib6_null_entry_template = {
.fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
.fib6_protocol = RTPROT_KERNEL,
.fib6_metric = ~(u32)0,
- .fib6_ref = ATOMIC_INIT(1),
+ .fib6_ref = REFCOUNT_INIT(1),
.fib6_type = RTN_UNREACHABLE,
.fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
};
@@ -379,11 +380,8 @@ static void ip6_dst_destroy(struct dst_entry *dst)
in6_dev_put(idev);
}
- rcu_read_lock();
- from = rcu_dereference(rt->from);
- rcu_assign_pointer(rt->from, NULL);
+ from = xchg((__force struct fib6_info **)&rt->from, NULL);
fib6_info_release(from);
- rcu_read_unlock();
}
static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
@@ -427,13 +425,15 @@ static bool rt6_check_expired(const struct rt6_info *rt)
return false;
}
-struct fib6_info *fib6_multipath_select(const struct net *net,
- struct fib6_info *match,
- struct flowi6 *fl6, int oif,
- const struct sk_buff *skb,
- int strict)
+void fib6_select_path(const struct net *net, struct fib6_result *res,
+ struct flowi6 *fl6, int oif, bool have_oif_match,
+ const struct sk_buff *skb, int strict)
{
struct fib6_info *sibling, *next_sibling;
+ struct fib6_info *match = res->f6i;
+
+ if (!match->fib6_nsiblings || have_oif_match)
+ goto out;
/* We might have already computed the hash for ICMPv6 errors. In such
* case it will always be non-zero. Otherwise now is the time to do it.
@@ -441,61 +441,89 @@ struct fib6_info *fib6_multipath_select(const struct net *net,
if (!fl6->mp_hash)
fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
- if (fl6->mp_hash <= atomic_read(&match->fib6_nh.nh_upper_bound))
- return match;
+ if (fl6->mp_hash <= atomic_read(&match->fib6_nh.fib_nh_upper_bound))
+ goto out;
list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
fib6_siblings) {
+ const struct fib6_nh *nh = &sibling->fib6_nh;
int nh_upper_bound;
- nh_upper_bound = atomic_read(&sibling->fib6_nh.nh_upper_bound);
+ nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound);
if (fl6->mp_hash > nh_upper_bound)
continue;
- if (rt6_score_route(sibling, oif, strict) < 0)
+ if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0)
break;
match = sibling;
break;
}
- return match;
+out:
+ res->f6i = match;
+ res->nh = &match->fib6_nh;
}
/*
* Route lookup. rcu_read_lock() should be held.
*/
-static inline struct fib6_info *rt6_device_match(struct net *net,
- struct fib6_info *rt,
- const struct in6_addr *saddr,
- int oif,
- int flags)
+static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh,
+ const struct in6_addr *saddr, int oif, int flags)
{
- struct fib6_info *sprt;
+ const struct net_device *dev;
- if (!oif && ipv6_addr_any(saddr) &&
- !(rt->fib6_nh.nh_flags & RTNH_F_DEAD))
- return rt;
+ if (nh->fib_nh_flags & RTNH_F_DEAD)
+ return false;
- for (sprt = rt; sprt; sprt = rcu_dereference(sprt->fib6_next)) {
- const struct net_device *dev = sprt->fib6_nh.nh_dev;
+ dev = nh->fib_nh_dev;
+ if (oif) {
+ if (dev->ifindex == oif)
+ return true;
+ } else {
+ if (ipv6_chk_addr(net, saddr, dev,
+ flags & RT6_LOOKUP_F_IFACE))
+ return true;
+ }
- if (sprt->fib6_nh.nh_flags & RTNH_F_DEAD)
- continue;
+ return false;
+}
- if (oif) {
- if (dev->ifindex == oif)
- return sprt;
- } else {
- if (ipv6_chk_addr(net, saddr, dev,
- flags & RT6_LOOKUP_F_IFACE))
- return sprt;
+static void rt6_device_match(struct net *net, struct fib6_result *res,
+ const struct in6_addr *saddr, int oif, int flags)
+{
+ struct fib6_info *f6i = res->f6i;
+ struct fib6_info *spf6i;
+ struct fib6_nh *nh;
+
+ if (!oif && ipv6_addr_any(saddr)) {
+ nh = &f6i->fib6_nh;
+ if (!(nh->fib_nh_flags & RTNH_F_DEAD))
+ goto out;
+ }
+
+ for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) {
+ nh = &spf6i->fib6_nh;
+ if (__rt6_device_match(net, nh, saddr, oif, flags)) {
+ res->f6i = spf6i;
+ goto out;
}
}
- if (oif && flags & RT6_LOOKUP_F_IFACE)
- return net->ipv6.fib6_null_entry;
+ if (oif && flags & RT6_LOOKUP_F_IFACE) {
+ res->f6i = net->ipv6.fib6_null_entry;
+ nh = &res->f6i->fib6_nh;
+ goto out;
+ }
- return rt->fib6_nh.nh_flags & RTNH_F_DEAD ? net->ipv6.fib6_null_entry : rt;
+ nh = &f6i->fib6_nh;
+ if (nh->fib_nh_flags & RTNH_F_DEAD) {
+ res->f6i = net->ipv6.fib6_null_entry;
+ nh = &res->f6i->fib6_nh;
+ }
+out:
+ res->nh = nh;
+ res->fib6_type = res->f6i->fib6_type;
+ res->fib6_flags = res->f6i->fib6_flags;
}
#ifdef CONFIG_IPV6_ROUTER_PREF
@@ -517,7 +545,7 @@ static void rt6_probe_deferred(struct work_struct *w)
kfree(work);
}
-static void rt6_probe(struct fib6_info *rt)
+static void rt6_probe(struct fib6_nh *fib6_nh)
{
struct __rt6_probe_work *work = NULL;
const struct in6_addr *nh_gw;
@@ -533,11 +561,11 @@ static void rt6_probe(struct fib6_info *rt)
* Router Reachability Probe MUST be rate-limited
* to no more than one per minute.
*/
- if (!rt || !(rt->fib6_flags & RTF_GATEWAY))
+ if (fib6_nh->fib_nh_gw_family)
return;
- nh_gw = &rt->fib6_nh.nh_gw;
- dev = rt->fib6_nh.nh_dev;
+ nh_gw = &fib6_nh->fib_nh_gw6;
+ dev = fib6_nh->fib_nh_dev;
rcu_read_lock_bh();
idev = __in6_dev_get(dev);
neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
@@ -554,13 +582,13 @@ static void rt6_probe(struct fib6_info *rt)
__neigh_set_probe_once(neigh);
}
write_unlock(&neigh->lock);
- } else if (time_after(jiffies, rt->last_probe +
+ } else if (time_after(jiffies, fib6_nh->last_probe +
idev->cnf.rtr_probe_interval)) {
work = kmalloc(sizeof(*work), GFP_ATOMIC);
}
if (work) {
- rt->last_probe = jiffies;
+ fib6_nh->last_probe = jiffies;
INIT_WORK(&work->work, rt6_probe_deferred);
work->target = *nh_gw;
dev_hold(dev);
@@ -572,7 +600,7 @@ out:
rcu_read_unlock_bh();
}
#else
-static inline void rt6_probe(struct fib6_info *rt)
+static inline void rt6_probe(struct fib6_nh *fib6_nh)
{
}
#endif
@@ -580,27 +608,14 @@ static inline void rt6_probe(struct fib6_info *rt)
/*
* Default Router Selection (RFC 2461 6.3.6)
*/
-static inline int rt6_check_dev(struct fib6_info *rt, int oif)
-{
- const struct net_device *dev = rt->fib6_nh.nh_dev;
-
- if (!oif || dev->ifindex == oif)
- return 2;
- return 0;
-}
-
-static inline enum rt6_nud_state rt6_check_neigh(struct fib6_info *rt)
+static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
{
enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
struct neighbour *neigh;
- if (rt->fib6_flags & RTF_NONEXTHOP ||
- !(rt->fib6_flags & RTF_GATEWAY))
- return RT6_NUD_SUCCEED;
-
rcu_read_lock_bh();
- neigh = __ipv6_neigh_lookup_noref(rt->fib6_nh.nh_dev,
- &rt->fib6_nh.nh_gw);
+ neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
+ &fib6_nh->fib_nh_gw6);
if (neigh) {
read_lock(&neigh->lock);
if (neigh->nud_state & NUD_VALID)
@@ -621,58 +636,44 @@ static inline enum rt6_nud_state rt6_check_neigh(struct fib6_info *rt)
return ret;
}
-static int rt6_score_route(struct fib6_info *rt, int oif, int strict)
+static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
+ int strict)
{
- int m;
+ int m = 0;
+
+ if (!oif || nh->fib_nh_dev->ifindex == oif)
+ m = 2;
- m = rt6_check_dev(rt, oif);
if (!m && (strict & RT6_LOOKUP_F_IFACE))
return RT6_NUD_FAIL_HARD;
#ifdef CONFIG_IPV6_ROUTER_PREF
- m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->fib6_flags)) << 2;
+ m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
#endif
- if (strict & RT6_LOOKUP_F_REACHABLE) {
- int n = rt6_check_neigh(rt);
+ if ((strict & RT6_LOOKUP_F_REACHABLE) &&
+ !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
+ int n = rt6_check_neigh(nh);
if (n < 0)
return n;
}
return m;
}
-/* called with rc_read_lock held */
-static inline bool fib6_ignore_linkdown(const struct fib6_info *f6i)
+static bool find_match(struct fib6_nh *nh, u32 fib6_flags,
+ int oif, int strict, int *mpri, bool *do_rr)
{
- const struct net_device *dev = fib6_info_nh_dev(f6i);
+ bool match_do_rr = false;
bool rc = false;
-
- if (dev) {
- const struct inet6_dev *idev = __in6_dev_get(dev);
-
- rc = !!idev->cnf.ignore_routes_with_linkdown;
- }
-
- return rc;
-}
-
-static struct fib6_info *find_match(struct fib6_info *rt, int oif, int strict,
- int *mpri, struct fib6_info *match,
- bool *do_rr)
-{
int m;
- bool match_do_rr = false;
- if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
+ if (nh->fib_nh_flags & RTNH_F_DEAD)
goto out;
- if (fib6_ignore_linkdown(rt) &&
- rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
+ if (ip6_ignore_linkdown(nh->fib_nh_dev) &&
+ nh->fib_nh_flags & RTNH_F_LINKDOWN &&
!(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
goto out;
- if (fib6_check_expired(rt))
- goto out;
-
- m = rt6_score_route(rt, oif, strict);
+ m = rt6_score_route(nh, fib6_flags, oif, strict);
if (m == RT6_NUD_FAIL_DO_RR) {
match_do_rr = true;
m = 0; /* lowest valid score */
@@ -681,67 +682,82 @@ static struct fib6_info *find_match(struct fib6_info *rt, int oif, int strict,
}
if (strict & RT6_LOOKUP_F_REACHABLE)
- rt6_probe(rt);
+ rt6_probe(nh);
/* note that m can be RT6_NUD_FAIL_PROBE at this point */
if (m > *mpri) {
*do_rr = match_do_rr;
*mpri = m;
- match = rt;
+ rc = true;
}
out:
- return match;
+ return rc;
}
-static struct fib6_info *find_rr_leaf(struct fib6_node *fn,
- struct fib6_info *leaf,
- struct fib6_info *rr_head,
- u32 metric, int oif, int strict,
- bool *do_rr)
+static void __find_rr_leaf(struct fib6_info *f6i_start,
+ struct fib6_info *nomatch, u32 metric,
+ struct fib6_result *res, struct fib6_info **cont,
+ int oif, int strict, bool *do_rr, int *mpri)
{
- struct fib6_info *rt, *match, *cont;
- int mpri = -1;
+ struct fib6_info *f6i;
- match = NULL;
- cont = NULL;
- for (rt = rr_head; rt; rt = rcu_dereference(rt->fib6_next)) {
- if (rt->fib6_metric != metric) {
- cont = rt;
- break;
+ for (f6i = f6i_start;
+ f6i && f6i != nomatch;
+ f6i = rcu_dereference(f6i->fib6_next)) {
+ struct fib6_nh *nh;
+
+ if (cont && f6i->fib6_metric != metric) {
+ *cont = f6i;
+ return;
}
- match = find_match(rt, oif, strict, &mpri, match, do_rr);
- }
+ if (fib6_check_expired(f6i))
+ continue;
- for (rt = leaf; rt && rt != rr_head;
- rt = rcu_dereference(rt->fib6_next)) {
- if (rt->fib6_metric != metric) {
- cont = rt;
- break;
+ nh = &f6i->fib6_nh;
+ if (find_match(nh, f6i->fib6_flags, oif, strict, mpri, do_rr)) {
+ res->f6i = f6i;
+ res->nh = nh;
+ res->fib6_flags = f6i->fib6_flags;
+ res->fib6_type = f6i->fib6_type;
}
-
- match = find_match(rt, oif, strict, &mpri, match, do_rr);
}
+}
+
+static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf,
+ struct fib6_info *rr_head, int oif, int strict,
+ bool *do_rr, struct fib6_result *res)
+{
+ u32 metric = rr_head->fib6_metric;
+ struct fib6_info *cont = NULL;
+ int mpri = -1;
- if (match || !cont)
- return match;
+ __find_rr_leaf(rr_head, NULL, metric, res, &cont,
+ oif, strict, do_rr, &mpri);
- for (rt = cont; rt; rt = rcu_dereference(rt->fib6_next))
- match = find_match(rt, oif, strict, &mpri, match, do_rr);
+ __find_rr_leaf(leaf, rr_head, metric, res, &cont,
+ oif, strict, do_rr, &mpri);
- return match;
+ if (res->f6i || !cont)
+ return;
+
+ __find_rr_leaf(cont, NULL, metric, res, NULL,
+ oif, strict, do_rr, &mpri);
}
-static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
- int oif, int strict)
+static void rt6_select(struct net *net, struct fib6_node *fn, int oif,
+ struct fib6_result *res, int strict)
{
struct fib6_info *leaf = rcu_dereference(fn->leaf);
- struct fib6_info *match, *rt0;
+ struct fib6_info *rt0;
bool do_rr = false;
int key_plen;
+ /* make sure this function or its helpers sets f6i */
+ res->f6i = NULL;
+
if (!leaf || leaf == net->ipv6.fib6_null_entry)
- return net->ipv6.fib6_null_entry;
+ goto out;
rt0 = rcu_dereference(fn->rr_ptr);
if (!rt0)
@@ -758,11 +774,9 @@ static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
key_plen = rt0->fib6_src.plen;
#endif
if (fn->fn_bit != key_plen)
- return net->ipv6.fib6_null_entry;
-
- match = find_rr_leaf(fn, leaf, rt0, rt0->fib6_metric, oif, strict,
- &do_rr);
+ goto out;
+ find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res);
if (do_rr) {
struct fib6_info *next = rcu_dereference(rt0->fib6_next);
@@ -779,12 +793,19 @@ static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
}
}
- return match ? match : net->ipv6.fib6_null_entry;
+out:
+ if (!res->f6i) {
+ res->f6i = net->ipv6.fib6_null_entry;
+ res->nh = &res->f6i->fib6_nh;
+ res->fib6_flags = res->f6i->fib6_flags;
+ res->fib6_type = res->f6i->fib6_type;
+ }
}
-static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt)
+static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
{
- return (rt->fib6_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
+ return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
+ res->nh->fib_nh_gw_family;
}
#ifdef CONFIG_IPV6_ROUTE_INFO
@@ -868,17 +889,17 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
*/
/* called with rcu_lock held */
-static struct net_device *ip6_rt_get_dev_rcu(struct fib6_info *rt)
+static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res)
{
- struct net_device *dev = rt->fib6_nh.nh_dev;
+ struct net_device *dev = res->nh->fib_nh_dev;
- if (rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
+ if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
/* for copies of local routes, dst->dev needs to be the
* device if it is a master device, the master device if
* device is enslaved, and the loopback as the default
*/
if (netif_is_l3_slave(dev) &&
- !rt6_need_strict(&rt->fib6_dst.addr))
+ !rt6_need_strict(&res->f6i->fib6_dst.addr))
dev = l3mdev_master_dev_rcu(dev);
else if (!netif_is_l3_master(dev))
dev = dev_net(dev)->loopback_dev;
@@ -924,11 +945,11 @@ static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
return flags;
}
-static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct fib6_info *ort)
+static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type)
{
- rt->dst.error = ip6_rt_type_to_error(ort->fib6_type);
+ rt->dst.error = ip6_rt_type_to_error(fib6_type);
- switch (ort->fib6_type) {
+ switch (fib6_type) {
case RTN_BLACKHOLE:
rt->dst.output = dst_discard_out;
rt->dst.input = dst_discard;
@@ -946,26 +967,28 @@ static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct fib6_info *ort)
}
}
-static void ip6_rt_init_dst(struct rt6_info *rt, struct fib6_info *ort)
+static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res)
{
- if (ort->fib6_flags & RTF_REJECT) {
- ip6_rt_init_dst_reject(rt, ort);
+ struct fib6_info *f6i = res->f6i;
+
+ if (res->fib6_flags & RTF_REJECT) {
+ ip6_rt_init_dst_reject(rt, res->fib6_type);
return;
}
rt->dst.error = 0;
rt->dst.output = ip6_output;
- if (ort->fib6_type == RTN_LOCAL || ort->fib6_type == RTN_ANYCAST) {
+ if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) {
rt->dst.input = ip6_input;
- } else if (ipv6_addr_type(&ort->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
+ } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
rt->dst.input = ip6_mc_input;
} else {
rt->dst.input = ip6_forward;
}
- if (ort->fib6_nh.nh_lwtstate) {
- rt->dst.lwtstate = lwtstate_get(ort->fib6_nh.nh_lwtstate);
+ if (res->nh->fib_nh_lws) {
+ rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);
lwtunnel_set_redirect(&rt->dst);
}
@@ -980,20 +1003,25 @@ static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
}
-/* Caller must already hold reference to @ort */
-static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
+/* Caller must already hold reference to f6i in result */
+static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res)
{
- struct net_device *dev = fib6_info_nh_dev(ort);
+ const struct fib6_nh *nh = res->nh;
+ const struct net_device *dev = nh->fib_nh_dev;
+ struct fib6_info *f6i = res->f6i;
- ip6_rt_init_dst(rt, ort);
+ ip6_rt_init_dst(rt, res);
- rt->rt6i_dst = ort->fib6_dst;
+ rt->rt6i_dst = f6i->fib6_dst;
rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
- rt->rt6i_gateway = ort->fib6_nh.nh_gw;
- rt->rt6i_flags = ort->fib6_flags;
- rt6_set_from(rt, ort);
+ rt->rt6i_flags = res->fib6_flags;
+ if (nh->fib_nh_gw_family) {
+ rt->rt6i_gateway = nh->fib_nh_gw6;
+ rt->rt6i_flags |= RTF_GATEWAY;
+ }
+ rt6_set_from(rt, f6i);
#ifdef CONFIG_IPV6_SUBTREES
- rt->rt6i_src = ort->fib6_src;
+ rt->rt6i_src = f6i->fib6_src;
#endif
}
@@ -1015,14 +1043,13 @@ static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
}
}
-static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
- bool null_fallback)
+static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
{
struct rt6_info *rt = *prt;
if (dst_hold_safe(&rt->dst))
return true;
- if (null_fallback) {
+ if (net) {
rt = net->ipv6.ip6_null_entry;
dst_hold(&rt->dst);
} else {
@@ -1033,22 +1060,24 @@ static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
}
/* called with rcu_lock held */
-static struct rt6_info *ip6_create_rt_rcu(struct fib6_info *rt)
+static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res)
{
- unsigned short flags = fib6_info_dst_flags(rt);
- struct net_device *dev = rt->fib6_nh.nh_dev;
+ struct net_device *dev = res->nh->fib_nh_dev;
+ struct fib6_info *f6i = res->f6i;
+ unsigned short flags;
struct rt6_info *nrt;
- if (!fib6_info_hold_safe(rt))
+ if (!fib6_info_hold_safe(f6i))
goto fallback;
+ flags = fib6_info_dst_flags(f6i);
nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
if (!nrt) {
- fib6_info_release(rt);
+ fib6_info_release(f6i);
goto fallback;
}
- ip6_rt_copy_init(nrt, rt);
+ ip6_rt_copy_init(nrt, res);
return nrt;
fallback:
@@ -1063,7 +1092,7 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
const struct sk_buff *skb,
int flags)
{
- struct fib6_info *f6i;
+ struct fib6_result res = {};
struct fib6_node *fn;
struct rt6_info *rt;
@@ -1073,37 +1102,38 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
rcu_read_lock();
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
restart:
- f6i = rcu_dereference(fn->leaf);
- if (!f6i) {
- f6i = net->ipv6.fib6_null_entry;
- } else {
- f6i = rt6_device_match(net, f6i, &fl6->saddr,
- fl6->flowi6_oif, flags);
- if (f6i->fib6_nsiblings && fl6->flowi6_oif == 0)
- f6i = fib6_multipath_select(net, f6i, fl6,
- fl6->flowi6_oif, skb,
- flags);
- }
- if (f6i == net->ipv6.fib6_null_entry) {
+ res.f6i = rcu_dereference(fn->leaf);
+ if (!res.f6i)
+ res.f6i = net->ipv6.fib6_null_entry;
+ else
+ rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif,
+ flags);
+
+ if (res.f6i == net->ipv6.fib6_null_entry) {
fn = fib6_backtrack(fn, &fl6->saddr);
if (fn)
goto restart;
+
+ rt = net->ipv6.ip6_null_entry;
+ dst_hold(&rt->dst);
+ goto out;
}
- trace_fib6_table_lookup(net, f6i, table, fl6);
+ fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
+ fl6->flowi6_oif != 0, skb, flags);
/* Search through exception table */
- rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
+ rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
if (rt) {
- if (ip6_hold_safe(net, &rt, true))
+ if (ip6_hold_safe(net, &rt))
dst_use_noref(&rt->dst, jiffies);
- } else if (f6i == net->ipv6.fib6_null_entry) {
- rt = net->ipv6.ip6_null_entry;
- dst_hold(&rt->dst);
} else {
- rt = ip6_create_rt_rcu(f6i);
+ rt = ip6_create_rt_rcu(&res);
}
+out:
+ trace_fib6_table_lookup(net, &res, table, fl6);
+
rcu_read_unlock();
return rt;
@@ -1169,10 +1199,11 @@ int ip6_ins_rt(struct net *net, struct fib6_info *rt)
return __ip6_ins_rt(rt, &info, NULL);
}
-static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
+static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
const struct in6_addr *daddr,
const struct in6_addr *saddr)
{
+ struct fib6_info *f6i = res->f6i;
struct net_device *dev;
struct rt6_info *rt;
@@ -1180,25 +1211,25 @@ static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
* Clone the route.
*/
- if (!fib6_info_hold_safe(ort))
+ if (!fib6_info_hold_safe(f6i))
return NULL;
- dev = ip6_rt_get_dev_rcu(ort);
+ dev = ip6_rt_get_dev_rcu(res);
rt = ip6_dst_alloc(dev_net(dev), dev, 0);
if (!rt) {
- fib6_info_release(ort);
+ fib6_info_release(f6i);
return NULL;
}
- ip6_rt_copy_init(rt, ort);
+ ip6_rt_copy_init(rt, res);
rt->rt6i_flags |= RTF_CACHE;
rt->dst.flags |= DST_HOST;
rt->rt6i_dst.addr = *daddr;
rt->rt6i_dst.plen = 128;
- if (!rt6_is_gw_or_nonexthop(ort)) {
- if (ort->fib6_dst.plen != 128 &&
- ipv6_addr_equal(&ort->fib6_dst.addr, daddr))
+ if (!rt6_is_gw_or_nonexthop(res)) {
+ if (f6i->fib6_dst.plen != 128 &&
+ ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
rt->rt6i_flags |= RTF_ANYCAST;
#ifdef CONFIG_IPV6_SUBTREES
if (rt->rt6i_src.plen && saddr) {
@@ -1211,55 +1242,56 @@ static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
return rt;
}
-static struct rt6_info *ip6_rt_pcpu_alloc(struct fib6_info *rt)
+static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res)
{
- unsigned short flags = fib6_info_dst_flags(rt);
+ struct fib6_info *f6i = res->f6i;
+ unsigned short flags = fib6_info_dst_flags(f6i);
struct net_device *dev;
struct rt6_info *pcpu_rt;
- if (!fib6_info_hold_safe(rt))
+ if (!fib6_info_hold_safe(f6i))
return NULL;
rcu_read_lock();
- dev = ip6_rt_get_dev_rcu(rt);
+ dev = ip6_rt_get_dev_rcu(res);
pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags);
rcu_read_unlock();
if (!pcpu_rt) {
- fib6_info_release(rt);
+ fib6_info_release(f6i);
return NULL;
}
- ip6_rt_copy_init(pcpu_rt, rt);
+ ip6_rt_copy_init(pcpu_rt, res);
pcpu_rt->rt6i_flags |= RTF_PCPU;
return pcpu_rt;
}
/* It should be called with rcu_read_lock() acquired */
-static struct rt6_info *rt6_get_pcpu_route(struct fib6_info *rt)
+static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
{
struct rt6_info *pcpu_rt, **p;
- p = this_cpu_ptr(rt->rt6i_pcpu);
+ p = this_cpu_ptr(res->f6i->rt6i_pcpu);
pcpu_rt = *p;
if (pcpu_rt)
- ip6_hold_safe(NULL, &pcpu_rt, false);
+ ip6_hold_safe(NULL, &pcpu_rt);
return pcpu_rt;
}
static struct rt6_info *rt6_make_pcpu_route(struct net *net,
- struct fib6_info *rt)
+ const struct fib6_result *res)
{
struct rt6_info *pcpu_rt, *prev, **p;
- pcpu_rt = ip6_rt_pcpu_alloc(rt);
+ pcpu_rt = ip6_rt_pcpu_alloc(res);
if (!pcpu_rt) {
dst_hold(&net->ipv6.ip6_null_entry->dst);
return net->ipv6.ip6_null_entry;
}
dst_hold(&pcpu_rt->dst);
- p = this_cpu_ptr(rt->rt6i_pcpu);
+ p = this_cpu_ptr(res->f6i->rt6i_pcpu);
prev = cmpxchg(p, NULL, pcpu_rt);
BUG_ON(prev);
@@ -1288,9 +1320,7 @@ static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
/* purge completely the exception to allow releasing the held resources:
* some [sk] cache may keep the dst around for unlimited time
*/
- from = rcu_dereference_protected(rt6_ex->rt6i->from,
- lockdep_is_held(&rt6_exception_lock));
- rcu_assign_pointer(rt6_ex->rt6i->from, NULL);
+ from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL);
fib6_info_release(from);
dst_dev_put(&rt6_ex->rt6i->dst);
@@ -1402,14 +1432,15 @@ __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
return NULL;
}
-static unsigned int fib6_mtu(const struct fib6_info *rt)
+static unsigned int fib6_mtu(const struct fib6_result *res)
{
+ const struct fib6_nh *nh = res->nh;
unsigned int mtu;
- if (rt->fib6_pmtu) {
- mtu = rt->fib6_pmtu;
+ if (res->f6i->fib6_pmtu) {
+ mtu = res->f6i->fib6_pmtu;
} else {
- struct net_device *dev = fib6_info_nh_dev(rt);
+ struct net_device *dev = nh->fib_nh_dev;
struct inet6_dev *idev;
rcu_read_lock();
@@ -1420,26 +1451,27 @@ static unsigned int fib6_mtu(const struct fib6_info *rt)
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
- return mtu - lwtunnel_headroom(rt->fib6_nh.nh_lwtstate, mtu);
+ return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
}
static int rt6_insert_exception(struct rt6_info *nrt,
- struct fib6_info *ort)
+ const struct fib6_result *res)
{
struct net *net = dev_net(nrt->dst.dev);
struct rt6_exception_bucket *bucket;
struct in6_addr *src_key = NULL;
struct rt6_exception *rt6_ex;
+ struct fib6_info *f6i = res->f6i;
int err = 0;
spin_lock_bh(&rt6_exception_lock);
- if (ort->exception_bucket_flushed) {
+ if (f6i->exception_bucket_flushed) {
err = -EINVAL;
goto out;
}
- bucket = rcu_dereference_protected(ort->rt6i_exception_bucket,
+ bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket,
lockdep_is_held(&rt6_exception_lock));
if (!bucket) {
bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
@@ -1448,24 +1480,24 @@ static int rt6_insert_exception(struct rt6_info *nrt,
err = -ENOMEM;
goto out;
}
- rcu_assign_pointer(ort->rt6i_exception_bucket, bucket);
+ rcu_assign_pointer(f6i->rt6i_exception_bucket, bucket);
}
#ifdef CONFIG_IPV6_SUBTREES
- /* rt6i_src.plen != 0 indicates ort is in subtree
+ /* fib6_src.plen != 0 indicates f6i is in subtree
* and exception table is indexed by a hash of
- * both rt6i_dst and rt6i_src.
+ * both fib6_dst and fib6_src.
* Otherwise, the exception table is indexed by
- * a hash of only rt6i_dst.
+ * a hash of only fib6_dst.
*/
- if (ort->fib6_src.plen)
+ if (f6i->fib6_src.plen)
src_key = &nrt->rt6i_src.addr;
#endif
- /* rt6_mtu_change() might lower mtu on ort.
+ /* rt6_mtu_change() might lower mtu on f6i.
* Only insert this exception route if its mtu
- * is less than ort's mtu value.
+ * is less than f6i's mtu value.
*/
- if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(ort)) {
+ if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
err = -EINVAL;
goto out;
}
@@ -1494,9 +1526,9 @@ out:
/* Update fn->fn_sernum to invalidate all cached dst */
if (!err) {
- spin_lock_bh(&ort->fib6_table->tb6_lock);
- fib6_update_sernum(net, ort);
- spin_unlock_bh(&ort->fib6_table->tb6_lock);
+ spin_lock_bh(&f6i->fib6_table->tb6_lock);
+ fib6_update_sernum(net, f6i);
+ spin_unlock_bh(&f6i->fib6_table->tb6_lock);
fib6_force_start_gc(net);
}
@@ -1533,33 +1565,33 @@ out:
/* Find cached rt in the hash table inside passed in rt
* Caller has to hold rcu_read_lock()
*/
-static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
+static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
struct in6_addr *daddr,
struct in6_addr *saddr)
{
struct rt6_exception_bucket *bucket;
struct in6_addr *src_key = NULL;
struct rt6_exception *rt6_ex;
- struct rt6_info *res = NULL;
+ struct rt6_info *ret = NULL;
- bucket = rcu_dereference(rt->rt6i_exception_bucket);
+ bucket = rcu_dereference(res->f6i->rt6i_exception_bucket);
#ifdef CONFIG_IPV6_SUBTREES
- /* rt6i_src.plen != 0 indicates rt is in subtree
+ /* fib6i_src.plen != 0 indicates f6i is in subtree
* and exception table is indexed by a hash of
- * both rt6i_dst and rt6i_src.
+ * both fib6_dst and fib6_src.
* Otherwise, the exception table is indexed by
- * a hash of only rt6i_dst.
+ * a hash of only fib6_dst.
*/
- if (rt->fib6_src.plen)
+ if (res->f6i->fib6_src.plen)
src_key = saddr;
#endif
rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
- res = rt6_ex->rt6i;
+ ret = rt6_ex->rt6i;
- return res;
+ return ret;
}
/* Remove the passed in cached rt from the hash table that contains it */
@@ -1807,11 +1839,10 @@ void rt6_age_exceptions(struct fib6_info *rt,
}
/* must be called with rcu lock held */
-struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
- int oif, struct flowi6 *fl6, int strict)
+int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
+ struct flowi6 *fl6, struct fib6_result *res, int strict)
{
struct fib6_node *fn, *saved_fn;
- struct fib6_info *f6i;
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
saved_fn = fn;
@@ -1820,8 +1851,8 @@ struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
oif = 0;
redo_rt6_select:
- f6i = rt6_select(net, fn, oif, strict);
- if (f6i == net->ipv6.fib6_null_entry) {
+ rt6_select(net, fn, oif, res, strict);
+ if (res->f6i == net->ipv6.fib6_null_entry) {
fn = fib6_backtrack(fn, &fl6->saddr);
if (fn)
goto redo_rt6_select;
@@ -1833,16 +1864,16 @@ redo_rt6_select:
}
}
- trace_fib6_table_lookup(net, f6i, table, fl6);
+ trace_fib6_table_lookup(net, res, table, fl6);
- return f6i;
+ return 0;
}
struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
int oif, struct flowi6 *fl6,
const struct sk_buff *skb, int flags)
{
- struct fib6_info *f6i;
+ struct fib6_result res = {};
struct rt6_info *rt;
int strict = 0;
@@ -1853,27 +1884,26 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
rcu_read_lock();
- f6i = fib6_table_lookup(net, table, oif, fl6, strict);
- if (f6i->fib6_nsiblings)
- f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);
-
- if (f6i == net->ipv6.fib6_null_entry) {
+ fib6_table_lookup(net, table, oif, fl6, &res, strict);
+ if (res.f6i == net->ipv6.fib6_null_entry) {
rt = net->ipv6.ip6_null_entry;
rcu_read_unlock();
dst_hold(&rt->dst);
return rt;
}
+ fib6_select_path(net, &res, fl6, oif, false, skb, strict);
+
/*Search through exception table */
- rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
+ rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
if (rt) {
- if (ip6_hold_safe(net, &rt, true))
+ if (ip6_hold_safe(net, &rt))
dst_use_noref(&rt->dst, jiffies);
rcu_read_unlock();
return rt;
} else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
- !(f6i->fib6_flags & RTF_GATEWAY))) {
+ !res.nh->fib_nh_gw_family)) {
/* Create a RTF_CACHE clone which will not be
* owned by the fib6 tree. It is for the special case where
* the daddr in the skb during the neighbor look-up is different
@@ -1881,7 +1911,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
*/
struct rt6_info *uncached_rt;
- uncached_rt = ip6_rt_cache_alloc(f6i, &fl6->daddr, NULL);
+ uncached_rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
rcu_read_unlock();
@@ -1903,10 +1933,10 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
struct rt6_info *pcpu_rt;
local_bh_disable();
- pcpu_rt = rt6_get_pcpu_route(f6i);
+ pcpu_rt = rt6_get_pcpu_route(&res);
if (!pcpu_rt)
- pcpu_rt = rt6_make_pcpu_route(net, f6i);
+ pcpu_rt = rt6_make_pcpu_route(net, &res);
local_bh_enable();
rcu_read_unlock();
@@ -2325,15 +2355,23 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
if (rt6->rt6i_flags & RTF_CACHE)
rt6_update_exception_stamp_rt(rt6);
} else if (daddr) {
- struct fib6_info *from;
+ struct fib6_result res = {};
struct rt6_info *nrt6;
rcu_read_lock();
- from = rcu_dereference(rt6->from);
- nrt6 = ip6_rt_cache_alloc(from, daddr, saddr);
+ res.f6i = rcu_dereference(rt6->from);
+ if (!res.f6i) {
+ rcu_read_unlock();
+ return;
+ }
+ res.nh = &res.f6i->fib6_nh;
+ res.fib6_flags = res.f6i->fib6_flags;
+ res.fib6_type = res.f6i->fib6_type;
+
+ nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
if (nrt6) {
rt6_do_update_pmtu(nrt6, mtu);
- if (rt6_insert_exception(nrt6, from))
+ if (rt6_insert_exception(nrt6, &res))
dst_release_immediate(&nrt6->dst);
}
rcu_read_unlock();
@@ -2406,6 +2444,36 @@ void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
NULL);
}
+static bool ip6_redirect_nh_match(const struct fib6_result *res,
+ struct flowi6 *fl6,
+ const struct in6_addr *gw,
+ struct rt6_info **ret)
+{
+ const struct fib6_nh *nh = res->nh;
+
+ if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
+ fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
+ return false;
+
+ /* rt_cache's gateway might be different from its 'parent'
+ * in the case of an ip redirect.
+ * So we keep searching in the exception table if the gateway
+ * is different.
+ */
+ if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
+ struct rt6_info *rt_cache;
+
+ rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
+ if (rt_cache &&
+ ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
+ *ret = rt_cache;
+ return true;
+ }
+ return false;
+ }
+ return true;
+}
+
/* Handle redirects */
struct ip6rd_flowi {
struct flowi6 fl6;
@@ -2419,7 +2487,8 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
int flags)
{
struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
- struct rt6_info *ret = NULL, *rt_cache;
+ struct rt6_info *ret = NULL;
+ struct fib6_result res = {};
struct fib6_info *rt;
struct fib6_node *fn;
@@ -2437,34 +2506,15 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
restart:
for_each_fib6_node_rt_rcu(fn) {
- if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
- continue;
+ res.f6i = rt;
+ res.nh = &rt->fib6_nh;
+
if (fib6_check_expired(rt))
continue;
if (rt->fib6_flags & RTF_REJECT)
break;
- if (!(rt->fib6_flags & RTF_GATEWAY))
- continue;
- if (fl6->flowi6_oif != rt->fib6_nh.nh_dev->ifindex)
- continue;
- /* rt_cache's gateway might be different from its 'parent'
- * in the case of an ip redirect.
- * So we keep searching in the exception table if the gateway
- * is different.
- */
- if (!ipv6_addr_equal(&rdfl->gateway, &rt->fib6_nh.nh_gw)) {
- rt_cache = rt6_find_cached_rt(rt,
- &fl6->daddr,
- &fl6->saddr);
- if (rt_cache &&
- ipv6_addr_equal(&rdfl->gateway,
- &rt_cache->rt6i_gateway)) {
- ret = rt_cache;
- break;
- }
- continue;
- }
- break;
+ if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, &ret))
+ goto out;
}
if (!rt)
@@ -2480,15 +2530,20 @@ restart:
goto restart;
}
+ res.f6i = rt;
+ res.nh = &rt->fib6_nh;
out:
- if (ret)
- ip6_hold_safe(net, &ret, true);
- else
- ret = ip6_create_rt_rcu(rt);
+ if (ret) {
+ ip6_hold_safe(net, &ret);
+ } else {
+ res.fib6_flags = res.f6i->fib6_flags;
+ res.fib6_type = res.f6i->fib6_type;
+ ret = ip6_create_rt_rcu(&res);
+ }
rcu_read_unlock();
- trace_fib6_table_lookup(net, rt, table, fl6);
+ trace_fib6_table_lookup(net, &res, table, fl6);
return ret;
};
@@ -2606,12 +2661,15 @@ out:
* based on ip6_dst_mtu_forward and exception logic of
* rt6_find_cached_rt; called with rcu_read_lock
*/
-u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
- struct in6_addr *saddr)
+u32 ip6_mtu_from_fib6(const struct fib6_result *res,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
{
struct rt6_exception_bucket *bucket;
+ const struct fib6_nh *nh = res->nh;
+ struct fib6_info *f6i = res->f6i;
+ const struct in6_addr *src_key;
struct rt6_exception *rt6_ex;
- struct in6_addr *src_key;
struct inet6_dev *idev;
u32 mtu = 0;
@@ -2633,7 +2691,7 @@ u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
mtu = dst_metric_raw(&rt6_ex->rt6i->dst, RTAX_MTU);
if (likely(!mtu)) {
- struct net_device *dev = fib6_info_nh_dev(f6i);
+ struct net_device *dev = nh->fib_nh_dev;
mtu = IPV6_MIN_MTU;
idev = __in6_dev_get(dev);
@@ -2643,7 +2701,7 @@ u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
out:
- return mtu - lwtunnel_headroom(fib6_info_nh_lwt(f6i), mtu);
+ return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
}
struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
@@ -2899,17 +2957,143 @@ out:
return err;
}
+static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
+{
+ if ((flags & RTF_REJECT) ||
+ (dev && (dev->flags & IFF_LOOPBACK) &&
+ !(addr_type & IPV6_ADDR_LOOPBACK) &&
+ !(flags & RTF_LOCAL)))
+ return true;
+
+ return false;
+}
+
+int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
+ struct fib6_config *cfg, gfp_t gfp_flags,
+ struct netlink_ext_ack *extack)
+{
+ struct net_device *dev = NULL;
+ struct inet6_dev *idev = NULL;
+ int addr_type;
+ int err;
+
+ fib6_nh->fib_nh_family = AF_INET6;
+
+ err = -ENODEV;
+ if (cfg->fc_ifindex) {
+ dev = dev_get_by_index(net, cfg->fc_ifindex);
+ if (!dev)
+ goto out;
+ idev = in6_dev_get(dev);
+ if (!idev)
+ goto out;
+ }
+
+ if (cfg->fc_flags & RTNH_F_ONLINK) {
+ if (!dev) {
+ NL_SET_ERR_MSG(extack,
+ "Nexthop device required for onlink");
+ goto out;
+ }
+
+ if (!(dev->flags & IFF_UP)) {
+ NL_SET_ERR_MSG(extack, "Nexthop device is not up");
+ err = -ENETDOWN;
+ goto out;
+ }
+
+ fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
+ }
+
+ fib6_nh->fib_nh_weight = 1;
+
+ /* We cannot add true routes via loopback here,
+ * they would result in kernel looping; promote them to reject routes
+ */
+ addr_type = ipv6_addr_type(&cfg->fc_dst);
+ if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
+ /* hold loopback dev/idev if we haven't done so. */
+ if (dev != net->loopback_dev) {
+ if (dev) {
+ dev_put(dev);
+ in6_dev_put(idev);
+ }
+ dev = net->loopback_dev;
+ dev_hold(dev);
+ idev = in6_dev_get(dev);
+ if (!idev) {
+ err = -ENODEV;
+ goto out;
+ }
+ }
+ goto set_dev;
+ }
+
+ if (cfg->fc_flags & RTF_GATEWAY) {
+ err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
+ if (err)
+ goto out;
+
+ fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
+ fib6_nh->fib_nh_gw_family = AF_INET6;
+ }
+
+ err = -ENODEV;
+ if (!dev)
+ goto out;
+
+ if (idev->cnf.disable_ipv6) {
+ NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
+ err = -EACCES;
+ goto out;
+ }
+
+ if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
+ NL_SET_ERR_MSG(extack, "Nexthop device is not up");
+ err = -ENETDOWN;
+ goto out;
+ }
+
+ if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
+ !netif_carrier_ok(dev))
+ fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
+
+ err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap,
+ cfg->fc_encap_type, cfg, gfp_flags, extack);
+ if (err)
+ goto out;
+set_dev:
+ fib6_nh->fib_nh_dev = dev;
+ fib6_nh->fib_nh_oif = dev->ifindex;
+ err = 0;
+out:
+ if (idev)
+ in6_dev_put(idev);
+
+ if (err) {
+ lwtstate_put(fib6_nh->fib_nh_lws);
+ fib6_nh->fib_nh_lws = NULL;
+ if (dev)
+ dev_put(dev);
+ }
+
+ return err;
+}
+
+void fib6_nh_release(struct fib6_nh *fib6_nh)
+{
+ fib_nh_common_release(&fib6_nh->nh_common);
+}
+
static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
gfp_t gfp_flags,
struct netlink_ext_ack *extack)
{
struct net *net = cfg->fc_nlinfo.nl_net;
struct fib6_info *rt = NULL;
- struct net_device *dev = NULL;
- struct inet6_dev *idev = NULL;
struct fib6_table *table;
- int addr_type;
int err = -EINVAL;
+ int addr_type;
/* RTF_PCPU is an internal flag; can not be set by userspace */
if (cfg->fc_flags & RTF_PCPU) {
@@ -2943,33 +3127,6 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
goto out;
}
#endif
- if (cfg->fc_ifindex) {
- err = -ENODEV;
- dev = dev_get_by_index(net, cfg->fc_ifindex);
- if (!dev)
- goto out;
- idev = in6_dev_get(dev);
- if (!idev)
- goto out;
- }
-
- if (cfg->fc_metric == 0)
- cfg->fc_metric = IP6_RT_PRIO_USER;
-
- if (cfg->fc_flags & RTNH_F_ONLINK) {
- if (!dev) {
- NL_SET_ERR_MSG(extack,
- "Nexthop device required for onlink");
- err = -ENODEV;
- goto out;
- }
-
- if (!(dev->flags & IFF_UP)) {
- NL_SET_ERR_MSG(extack, "Nexthop device is not up");
- err = -ENETDOWN;
- goto out;
- }
- }
err = -ENOBUFS;
if (cfg->fc_nlinfo.nlh &&
@@ -3013,18 +3170,10 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
cfg->fc_protocol = RTPROT_BOOT;
rt->fib6_protocol = cfg->fc_protocol;
- addr_type = ipv6_addr_type(&cfg->fc_dst);
-
- if (cfg->fc_encap) {
- struct lwtunnel_state *lwtstate;
-
- err = lwtunnel_build_state(cfg->fc_encap_type,
- cfg->fc_encap, AF_INET6, cfg,
- &lwtstate, extack);
- if (err)
- goto out;
- rt->fib6_nh.nh_lwtstate = lwtstate_get(lwtstate);
- }
+ rt->fib6_table = table;
+ rt->fib6_metric = cfg->fc_metric;
+ rt->fib6_type = cfg->fc_type;
+ rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
rt->fib6_dst.plen = cfg->fc_dst_len;
@@ -3035,62 +3184,20 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
rt->fib6_src.plen = cfg->fc_src_len;
#endif
-
- rt->fib6_metric = cfg->fc_metric;
- rt->fib6_nh.nh_weight = 1;
-
- rt->fib6_type = cfg->fc_type;
+ err = fib6_nh_init(net, &rt->fib6_nh, cfg, gfp_flags, extack);
+ if (err)
+ goto out;
/* We cannot add true routes via loopback here,
- they would result in kernel looping; promote them to reject routes
+ * they would result in kernel looping; promote them to reject routes
*/
- if ((cfg->fc_flags & RTF_REJECT) ||
- (dev && (dev->flags & IFF_LOOPBACK) &&
- !(addr_type & IPV6_ADDR_LOOPBACK) &&
- !(cfg->fc_flags & RTF_LOCAL))) {
- /* hold loopback dev/idev if we haven't done so. */
- if (dev != net->loopback_dev) {
- if (dev) {
- dev_put(dev);
- in6_dev_put(idev);
- }
- dev = net->loopback_dev;
- dev_hold(dev);
- idev = in6_dev_get(dev);
- if (!idev) {
- err = -ENODEV;
- goto out;
- }
- }
- rt->fib6_flags = RTF_REJECT|RTF_NONEXTHOP;
- goto install_route;
- }
-
- if (cfg->fc_flags & RTF_GATEWAY) {
- err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
- if (err)
- goto out;
-
- rt->fib6_nh.nh_gw = cfg->fc_gateway;
- }
-
- err = -ENODEV;
- if (!dev)
- goto out;
-
- if (idev->cnf.disable_ipv6) {
- NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
- err = -EACCES;
- goto out;
- }
-
- if (!(dev->flags & IFF_UP)) {
- NL_SET_ERR_MSG(extack, "Nexthop device is not up");
- err = -ENETDOWN;
- goto out;
- }
+ addr_type = ipv6_addr_type(&cfg->fc_dst);
+ if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh.fib_nh_dev, addr_type))
+ rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
+ struct net_device *dev = fib6_info_nh_dev(rt);
+
if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
NL_SET_ERR_MSG(extack, "Invalid source address");
err = -EINVAL;
@@ -3101,26 +3208,8 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
} else
rt->fib6_prefsrc.plen = 0;
- rt->fib6_flags = cfg->fc_flags;
-
-install_route:
- if (!(rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
- !netif_carrier_ok(dev))
- rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
- rt->fib6_nh.nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK);
- rt->fib6_nh.nh_dev = dev;
- rt->fib6_table = table;
-
- if (idev)
- in6_dev_put(idev);
-
return rt;
out:
- if (dev)
- dev_put(dev);
- if (idev)
- in6_dev_put(idev);
-
fib6_info_release(rt);
return ERR_PTR(err);
}
@@ -3261,10 +3350,16 @@ static int ip6_route_del(struct fib6_config *cfg,
if (fn) {
for_each_fib6_node_rt_rcu(fn) {
+ struct fib6_nh *nh;
+
if (cfg->fc_flags & RTF_CACHE) {
+ struct fib6_result res = {
+ .f6i = rt,
+ };
int rc;
- rt_cache = rt6_find_cached_rt(rt, &cfg->fc_dst,
+ rt_cache = rt6_find_cached_rt(&res,
+ &cfg->fc_dst,
&cfg->fc_src);
if (rt_cache) {
rc = ip6_del_cached_rt(rt_cache, cfg);
@@ -3275,12 +3370,14 @@ static int ip6_route_del(struct fib6_config *cfg,
}
continue;
}
+
+ nh = &rt->fib6_nh;
if (cfg->fc_ifindex &&
- (!rt->fib6_nh.nh_dev ||
- rt->fib6_nh.nh_dev->ifindex != cfg->fc_ifindex))
+ (!nh->fib_nh_dev ||
+ nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
continue;
if (cfg->fc_flags & RTF_GATEWAY &&
- !ipv6_addr_equal(&cfg->fc_gateway, &rt->fib6_nh.nh_gw))
+ !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
continue;
if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
continue;
@@ -3306,10 +3403,10 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
{
struct netevent_redirect netevent;
struct rt6_info *rt, *nrt = NULL;
+ struct fib6_result res = {};
struct ndisc_options ndopts;
struct inet6_dev *in6_dev;
struct neighbour *neigh;
- struct fib6_info *from;
struct rd_msg *msg;
int optlen, on_link;
u8 *lladdr;
@@ -3392,14 +3489,14 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
NDISC_REDIRECT, &ndopts);
rcu_read_lock();
- from = rcu_dereference(rt->from);
- /* This fib6_info_hold() is safe here because we hold reference to rt
- * and rt already holds reference to fib6_info.
- */
- fib6_info_hold(from);
- rcu_read_unlock();
+ res.f6i = rcu_dereference(rt->from);
+ if (!res.f6i)
+ goto out;
- nrt = ip6_rt_cache_alloc(from, &msg->dest, NULL);
+ res.nh = &res.f6i->fib6_nh;
+ res.fib6_flags = res.f6i->fib6_flags;
+ res.fib6_type = res.f6i->fib6_type;
+ nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
if (!nrt)
goto out;
@@ -3409,11 +3506,8 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
- /* No need to remove rt from the exception table if rt is
- * a cached route because rt6_insert_exception() will
- * takes care of it
- */
- if (rt6_insert_exception(nrt, from)) {
+ /* rt6_insert_exception() will take care of duplicated exceptions */
+ if (rt6_insert_exception(nrt, &res)) {
dst_release_immediate(&nrt->dst);
goto out;
}
@@ -3425,7 +3519,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
out:
- fib6_info_release(from);
+ rcu_read_unlock();
neigh_release(neigh);
}
@@ -3451,11 +3545,12 @@ static struct fib6_info *rt6_get_route_info(struct net *net,
goto out;
for_each_fib6_node_rt_rcu(fn) {
- if (rt->fib6_nh.nh_dev->ifindex != ifindex)
+ if (rt->fib6_nh.fib_nh_dev->ifindex != ifindex)
continue;
- if ((rt->fib6_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
+ if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
+ !rt->fib6_nh.fib_nh_gw_family)
continue;
- if (!ipv6_addr_equal(&rt->fib6_nh.nh_gw, gwaddr))
+ if (!ipv6_addr_equal(&rt->fib6_nh.fib_nh_gw6, gwaddr))
continue;
if (!fib6_info_hold_safe(rt))
continue;
@@ -3513,9 +3608,11 @@ struct fib6_info *rt6_get_dflt_router(struct net *net,
rcu_read_lock();
for_each_fib6_node_rt_rcu(&table->tb6_root) {
- if (dev == rt->fib6_nh.nh_dev &&
+ struct fib6_nh *nh = &rt->fib6_nh;
+
+ if (dev == nh->fib_nh_dev &&
((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
- ipv6_addr_equal(&rt->fib6_nh.nh_gw, addr))
+ ipv6_addr_equal(&nh->fib_nh_gw6, addr))
break;
}
if (rt && !fib6_info_hold_safe(rt))
@@ -3606,7 +3703,7 @@ static void rtmsg_to_fib6_config(struct net *net,
.fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
: RT6_TABLE_MAIN,
.fc_ifindex = rtmsg->rtmsg_ifindex,
- .fc_metric = rtmsg->rtmsg_metric,
+ .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
.fc_expires = rtmsg->rtmsg_info,
.fc_dst_len = rtmsg->rtmsg_dst_len,
.fc_src_len = rtmsg->rtmsg_src_len,
@@ -3664,23 +3761,34 @@ int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
{
- int type;
struct dst_entry *dst = skb_dst(skb);
+ struct net *net = dev_net(dst->dev);
+ struct inet6_dev *idev;
+ int type;
+
+ if (netif_is_l3_master(skb->dev) &&
+ dst->dev == net->loopback_dev)
+ idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
+ else
+ idev = ip6_dst_idev(dst);
+
switch (ipstats_mib_noroutes) {
case IPSTATS_MIB_INNOROUTES:
type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
if (type == IPV6_ADDR_ANY) {
- IP6_INC_STATS(dev_net(dst->dev),
- __in6_dev_get_safely(skb->dev),
- IPSTATS_MIB_INADDRERRORS);
+ IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
break;
}
/* FALLTHROUGH */
case IPSTATS_MIB_OUTNOROUTES:
- IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
- ipstats_mib_noroutes);
+ IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
break;
}
+
+ /* Start over by dropping the dst for l3mdev case */
+ if (netif_is_l3_master(skb->dev))
+ skb_dst_drop(skb);
+
icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
kfree_skb(skb);
return 0;
@@ -3717,36 +3825,26 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net,
const struct in6_addr *addr,
bool anycast, gfp_t gfp_flags)
{
- u32 tb_id;
- struct net_device *dev = idev->dev;
- struct fib6_info *f6i;
-
- f6i = fib6_info_alloc(gfp_flags);
- if (!f6i)
- return ERR_PTR(-ENOMEM);
+ struct fib6_config cfg = {
+ .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
+ .fc_ifindex = idev->dev->ifindex,
+ .fc_flags = RTF_UP | RTF_ADDRCONF | RTF_NONEXTHOP,
+ .fc_dst = *addr,
+ .fc_dst_len = 128,
+ .fc_protocol = RTPROT_KERNEL,
+ .fc_nlinfo.nl_net = net,
+ .fc_ignore_dev_down = true,
+ };
- f6i->fib6_metrics = ip_fib_metrics_init(net, NULL, 0, NULL);
- f6i->dst_nocount = true;
- f6i->dst_host = true;
- f6i->fib6_protocol = RTPROT_KERNEL;
- f6i->fib6_flags = RTF_UP | RTF_NONEXTHOP;
if (anycast) {
- f6i->fib6_type = RTN_ANYCAST;
- f6i->fib6_flags |= RTF_ANYCAST;
+ cfg.fc_type = RTN_ANYCAST;
+ cfg.fc_flags |= RTF_ANYCAST;
} else {
- f6i->fib6_type = RTN_LOCAL;
- f6i->fib6_flags |= RTF_LOCAL;
+ cfg.fc_type = RTN_LOCAL;
+ cfg.fc_flags |= RTF_LOCAL;
}
- f6i->fib6_nh.nh_gw = *addr;
- dev_hold(dev);
- f6i->fib6_nh.nh_dev = dev;
- f6i->fib6_dst.addr = *addr;
- f6i->fib6_dst.plen = 128;
- tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
- f6i->fib6_table = fib6_get_table(net, tb_id);
-
- return f6i;
+ return ip6_route_info_create(&cfg, gfp_flags, NULL);
}
/* remove deleted ip from prefsrc entries */
@@ -3762,7 +3860,7 @@ static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
struct net *net = ((struct arg_dev_net_ip *)arg)->net;
struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
- if (((void *)rt->fib6_nh.nh_dev == dev || !dev) &&
+ if (((void *)rt->fib6_nh.fib_nh_dev == dev || !dev) &&
rt != net->ipv6.fib6_null_entry &&
ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
spin_lock_bh(&rt6_exception_lock);
@@ -3784,7 +3882,7 @@ void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
fib6_clean_all(net, fib6_remove_prefsrc, &adni);
}
-#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
+#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
/* Remove routers and update dst entries when gateway turn into host. */
static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
@@ -3792,7 +3890,8 @@ static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
struct in6_addr *gateway = (struct in6_addr *)arg;
if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
- ipv6_addr_equal(gateway, &rt->fib6_nh.nh_gw)) {
+ rt->fib6_nh.fib_nh_gw_family &&
+ ipv6_addr_equal(gateway, &rt->fib6_nh.fib_nh_gw6)) {
return -1;
}
@@ -3813,7 +3912,7 @@ void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
struct arg_netdev_event {
const struct net_device *dev;
union {
- unsigned int nh_flags;
+ unsigned char nh_flags;
unsigned long event;
};
};
@@ -3840,9 +3939,9 @@ static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
static bool rt6_is_dead(const struct fib6_info *rt)
{
- if (rt->fib6_nh.nh_flags & RTNH_F_DEAD ||
- (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
- fib6_ignore_linkdown(rt)))
+ if (rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD ||
+ (rt->fib6_nh.fib_nh_flags & RTNH_F_LINKDOWN &&
+ ip6_ignore_linkdown(rt->fib6_nh.fib_nh_dev)))
return true;
return false;
@@ -3854,11 +3953,11 @@ static int rt6_multipath_total_weight(const struct fib6_info *rt)
int total = 0;
if (!rt6_is_dead(rt))
- total += rt->fib6_nh.nh_weight;
+ total += rt->fib6_nh.fib_nh_weight;
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
if (!rt6_is_dead(iter))
- total += iter->fib6_nh.nh_weight;
+ total += iter->fib6_nh.fib_nh_weight;
}
return total;
@@ -3869,11 +3968,11 @@ static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
int upper_bound = -1;
if (!rt6_is_dead(rt)) {
- *weight += rt->fib6_nh.nh_weight;
+ *weight += rt->fib6_nh.fib_nh_weight;
upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
total) - 1;
}
- atomic_set(&rt->fib6_nh.nh_upper_bound, upper_bound);
+ atomic_set(&rt->fib6_nh.fib_nh_upper_bound, upper_bound);
}
static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
@@ -3916,8 +4015,9 @@ static int fib6_ifup(struct fib6_info *rt, void *p_arg)
const struct arg_netdev_event *arg = p_arg;
struct net *net = dev_net(arg->dev);
- if (rt != net->ipv6.fib6_null_entry && rt->fib6_nh.nh_dev == arg->dev) {
- rt->fib6_nh.nh_flags &= ~arg->nh_flags;
+ if (rt != net->ipv6.fib6_null_entry &&
+ rt->fib6_nh.fib_nh_dev == arg->dev) {
+ rt->fib6_nh.fib_nh_flags &= ~arg->nh_flags;
fib6_update_sernum_upto_root(net, rt);
rt6_multipath_rebalance(rt);
}
@@ -3925,7 +4025,7 @@ static int fib6_ifup(struct fib6_info *rt, void *p_arg)
return 0;
}
-void rt6_sync_up(struct net_device *dev, unsigned int nh_flags)
+void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
{
struct arg_netdev_event arg = {
.dev = dev,
@@ -3945,10 +4045,10 @@ static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
{
struct fib6_info *iter;
- if (rt->fib6_nh.nh_dev == dev)
+ if (rt->fib6_nh.fib_nh_dev == dev)
return true;
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
- if (iter->fib6_nh.nh_dev == dev)
+ if (iter->fib6_nh.fib_nh_dev == dev)
return true;
return false;
@@ -3969,12 +4069,12 @@ static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
struct fib6_info *iter;
unsigned int dead = 0;
- if (rt->fib6_nh.nh_dev == down_dev ||
- rt->fib6_nh.nh_flags & RTNH_F_DEAD)
+ if (rt->fib6_nh.fib_nh_dev == down_dev ||
+ rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
dead++;
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
- if (iter->fib6_nh.nh_dev == down_dev ||
- iter->fib6_nh.nh_flags & RTNH_F_DEAD)
+ if (iter->fib6_nh.fib_nh_dev == down_dev ||
+ iter->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
dead++;
return dead;
@@ -3982,15 +4082,15 @@ static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
const struct net_device *dev,
- unsigned int nh_flags)
+ unsigned char nh_flags)
{
struct fib6_info *iter;
- if (rt->fib6_nh.nh_dev == dev)
- rt->fib6_nh.nh_flags |= nh_flags;
+ if (rt->fib6_nh.fib_nh_dev == dev)
+ rt->fib6_nh.fib_nh_flags |= nh_flags;
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
- if (iter->fib6_nh.nh_dev == dev)
- iter->fib6_nh.nh_flags |= nh_flags;
+ if (iter->fib6_nh.fib_nh_dev == dev)
+ iter->fib6_nh.fib_nh_flags |= nh_flags;
}
/* called with write lock held for table with rt */
@@ -4005,12 +4105,12 @@ static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
switch (arg->event) {
case NETDEV_UNREGISTER:
- return rt->fib6_nh.nh_dev == dev ? -1 : 0;
+ return rt->fib6_nh.fib_nh_dev == dev ? -1 : 0;
case NETDEV_DOWN:
if (rt->should_flush)
return -1;
if (!rt->fib6_nsiblings)
- return rt->fib6_nh.nh_dev == dev ? -1 : 0;
+ return rt->fib6_nh.fib_nh_dev == dev ? -1 : 0;
if (rt6_multipath_uses_dev(rt, dev)) {
unsigned int count;
@@ -4026,10 +4126,10 @@ static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
}
return -2;
case NETDEV_CHANGE:
- if (rt->fib6_nh.nh_dev != dev ||
+ if (rt->fib6_nh.fib_nh_dev != dev ||
rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
break;
- rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
+ rt->fib6_nh.fib_nh_flags |= RTNH_F_LINKDOWN;
rt6_multipath_rebalance(rt);
break;
}
@@ -4085,7 +4185,7 @@ static int rt6_mtu_change_route(struct fib6_info *rt, void *p_arg)
Since RFC 1981 doesn't include administrative MTU increase
update PMTU increase is a MUST. (i.e. jumbo frame)
*/
- if (rt->fib6_nh.nh_dev == arg->dev &&
+ if (rt->fib6_nh.fib_nh_dev == arg->dev &&
!fib6_metric_locked(rt, RTAX_MTU)) {
u32 mtu = rt->fib6_pmtu;
@@ -4139,8 +4239,8 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
unsigned int pref;
int err;
- err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
- extack);
+ err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
+ rtm_ipv6_policy, extack);
if (err < 0)
goto errout;
@@ -4376,7 +4476,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
goto cleanup;
}
- rt->fib6_nh.nh_weight = rtnh->rtnh_hops + 1;
+ rt->fib6_nh.fib_nh_weight = rtnh->rtnh_hops + 1;
err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
rt, &r_cfg);
@@ -4526,6 +4626,9 @@ static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
return err;
+ if (cfg.fc_metric == 0)
+ cfg.fc_metric = IP6_RT_PRIO_USER;
+
if (cfg.fc_mp)
return ip6_route_multipath_add(&cfg, extack);
else
@@ -4540,7 +4643,7 @@ static size_t rt6_nlmsg_size(struct fib6_info *rt)
nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
+ NLA_ALIGN(sizeof(struct rtnexthop))
+ nla_total_size(16) /* RTA_GATEWAY */
- + lwtunnel_get_encap_size(rt->fib6_nh.nh_lwtstate);
+ + lwtunnel_get_encap_size(rt->fib6_nh.fib_nh_lws);
nexthop_len *= rt->fib6_nsiblings;
}
@@ -4558,77 +4661,10 @@ static size_t rt6_nlmsg_size(struct fib6_info *rt)
+ nla_total_size(sizeof(struct rta_cacheinfo))
+ nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
+ nla_total_size(1) /* RTA_PREF */
- + lwtunnel_get_encap_size(rt->fib6_nh.nh_lwtstate)
+ + lwtunnel_get_encap_size(rt->fib6_nh.fib_nh_lws)
+ nexthop_len;
}
-static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
- unsigned int *flags, bool skip_oif)
-{
- if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
- *flags |= RTNH_F_DEAD;
-
- if (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN) {
- *flags |= RTNH_F_LINKDOWN;
-
- rcu_read_lock();
- if (fib6_ignore_linkdown(rt))
- *flags |= RTNH_F_DEAD;
- rcu_read_unlock();
- }
-
- if (rt->fib6_flags & RTF_GATEWAY) {
- if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->fib6_nh.nh_gw) < 0)
- goto nla_put_failure;
- }
-
- *flags |= (rt->fib6_nh.nh_flags & RTNH_F_ONLINK);
- if (rt->fib6_nh.nh_flags & RTNH_F_OFFLOAD)
- *flags |= RTNH_F_OFFLOAD;
-
- /* not needed for multipath encoding b/c it has a rtnexthop struct */
- if (!skip_oif && rt->fib6_nh.nh_dev &&
- nla_put_u32(skb, RTA_OIF, rt->fib6_nh.nh_dev->ifindex))
- goto nla_put_failure;
-
- if (rt->fib6_nh.nh_lwtstate &&
- lwtunnel_fill_encap(skb, rt->fib6_nh.nh_lwtstate) < 0)
- goto nla_put_failure;
-
- return 0;
-
-nla_put_failure:
- return -EMSGSIZE;
-}
-
-/* add multipath next hop */
-static int rt6_add_nexthop(struct sk_buff *skb, struct fib6_info *rt)
-{
- const struct net_device *dev = rt->fib6_nh.nh_dev;
- struct rtnexthop *rtnh;
- unsigned int flags = 0;
-
- rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
- if (!rtnh)
- goto nla_put_failure;
-
- rtnh->rtnh_hops = rt->fib6_nh.nh_weight - 1;
- rtnh->rtnh_ifindex = dev ? dev->ifindex : 0;
-
- if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
- goto nla_put_failure;
-
- rtnh->rtnh_flags = flags;
-
- /* length of rtnetlink header + attributes */
- rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
-
- return 0;
-
-nla_put_failure:
- return -EMSGSIZE;
-}
-
static int rt6_fill_node(struct net *net, struct sk_buff *skb,
struct fib6_info *rt, struct dst_entry *dst,
struct in6_addr *dest, struct in6_addr *src,
@@ -4741,23 +4777,30 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
struct fib6_info *sibling, *next_sibling;
struct nlattr *mp;
- mp = nla_nest_start(skb, RTA_MULTIPATH);
+ mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
if (!mp)
goto nla_put_failure;
- if (rt6_add_nexthop(skb, rt) < 0)
+ if (fib_add_nexthop(skb, &rt->fib6_nh.nh_common,
+ rt->fib6_nh.fib_nh_weight) < 0)
goto nla_put_failure;
list_for_each_entry_safe(sibling, next_sibling,
&rt->fib6_siblings, fib6_siblings) {
- if (rt6_add_nexthop(skb, sibling) < 0)
+ if (fib_add_nexthop(skb, &sibling->fib6_nh.nh_common,
+ sibling->fib6_nh.fib_nh_weight) < 0)
goto nla_put_failure;
}
nla_nest_end(skb, mp);
} else {
- if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
+ unsigned char nh_flags = 0;
+
+ if (fib_nexthop_info(skb, &rt->fib6_nh.nh_common,
+ &nh_flags, false) < 0)
goto nla_put_failure;
+
+ rtm->rtm_flags |= nh_flags;
}
if (rt6_flags & RTF_EXPIRES) {
@@ -4783,7 +4826,7 @@ nla_put_failure:
static bool fib6_info_uses_dev(const struct fib6_info *f6i,
const struct net_device *dev)
{
- if (f6i->fib6_nh.nh_dev == dev)
+ if (f6i->fib6_nh.fib_nh_dev == dev)
return true;
if (f6i->fib6_nsiblings) {
@@ -4791,7 +4834,7 @@ static bool fib6_info_uses_dev(const struct fib6_info *f6i,
list_for_each_entry_safe(sibling, next_sibling,
&f6i->fib6_siblings, fib6_siblings) {
- if (sibling->fib6_nh.nh_dev == dev)
+ if (sibling->fib6_nh.fib_nh_dev == dev)
return true;
}
}
@@ -4843,8 +4886,8 @@ static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
}
if (!netlink_strict_get_check(skb))
- return nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX,
- rtm_ipv6_policy, extack);
+ return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
+ rtm_ipv6_policy, extack);
rtm = nlmsg_data(nlh);
if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
@@ -4860,8 +4903,8 @@ static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
return -EINVAL;
}
- err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
- rtm_ipv6_policy, extack);
+ err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
+ rtm_ipv6_policy, extack);
if (err)
return err;
@@ -5013,16 +5056,20 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
rcu_read_lock();
from = rcu_dereference(rt->from);
-
- if (fibmatch)
- err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, iif,
- RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
- nlh->nlmsg_seq, 0);
- else
- err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
- &fl6.saddr, iif, RTM_NEWROUTE,
- NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
- 0);
+ if (from) {
+ if (fibmatch)
+ err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
+ iif, RTM_NEWROUTE,
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, 0);
+ else
+ err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
+ &fl6.saddr, iif, RTM_NEWROUTE,
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, 0);
+ } else {
+ err = -ENETUNREACH;
+ }
rcu_read_unlock();
if (err < 0) {
@@ -5076,7 +5123,7 @@ static int ip6_route_dev_notify(struct notifier_block *this,
return NOTIFY_OK;
if (event == NETDEV_REGISTER) {
- net->ipv6.fib6_null_entry->fib6_nh.nh_dev = dev;
+ net->ipv6.fib6_null_entry->fib6_nh.fib_nh_dev = dev;
net->ipv6.ip6_null_entry->dst.dev = dev;
net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
@@ -5411,7 +5458,7 @@ void __init ip6_route_init_special_entries(void)
/* Registering of the loopback is done before this portion of code,
* the loopback reference in rt6_info will not be taken, do it
* manually for init_net */
- init_net.ipv6.fib6_null_entry->fib6_nh.nh_dev = init_net.loopback_dev;
+ init_net.ipv6.fib6_null_entry->fib6_nh.fib_nh_dev = init_net.loopback_dev;
init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 02:22:13 +0000