summaryrefslogtreecommitdiffstats
path: root/net/ipv4/route.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r--net/ipv4/route.c82
1 files changed, 52 insertions, 30 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a5da63e5faa2..f3f2adf630d4 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -500,15 +500,17 @@ EXPORT_SYMBOL(ip_idents_reserve);
void __ip_select_ident(struct net *net, struct iphdr *iph, int segs)
{
- static u32 ip_idents_hashrnd __read_mostly;
u32 hash, id;
- net_get_random_once(&ip_idents_hashrnd, sizeof(ip_idents_hashrnd));
+ /* Note the following code is not safe, but this is okay. */
+ if (unlikely(siphash_key_is_zero(&net->ipv4.ip_id_key)))
+ get_random_bytes(&net->ipv4.ip_id_key,
+ sizeof(net->ipv4.ip_id_key));
- hash = jhash_3words((__force u32)iph->daddr,
+ hash = siphash_3u32((__force u32)iph->daddr,
(__force u32)iph->saddr,
- iph->protocol ^ net_hash_mix(net),
- ip_idents_hashrnd);
+ iph->protocol,
+ &net->ipv4.ip_id_key);
id = ip_idents_reserve(hash, segs);
iph->id = htons(id);
}
@@ -642,7 +644,7 @@ static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw,
unsigned int i;
int depth;
- genid = fnhe_genid(dev_net(nh->nh_dev));
+ genid = fnhe_genid(dev_net(nh->fib_nh_dev));
hval = fnhe_hashfun(daddr);
spin_lock_bh(&fnhe_lock);
@@ -776,8 +778,10 @@ static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flow
neigh_event_send(n, NULL);
} else {
if (fib_lookup(net, fl4, &res, 0) == 0) {
- struct fib_nh *nh = &FIB_RES_NH(res);
+ struct fib_nh_common *nhc = FIB_RES_NHC(res);
+ struct fib_nh *nh;
+ nh = container_of(nhc, struct fib_nh, nh_common);
update_or_create_fnhe(nh, fl4->daddr, new_gw,
0, false,
jiffies + ip_rt_gc_timeout);
@@ -1025,8 +1029,10 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
rcu_read_lock();
if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) {
- struct fib_nh *nh = &FIB_RES_NH(res);
+ struct fib_nh_common *nhc = FIB_RES_NHC(res);
+ struct fib_nh *nh;
+ nh = container_of(nhc, struct fib_nh, nh_common);
update_or_create_fnhe(nh, fl4->daddr, 0, mtu, lock,
jiffies + ip_rt_mtu_expires);
}
@@ -1176,7 +1182,7 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
*
* When a PMTU/redirect information update invalidates a route,
* this is indicated by setting obsolete to DST_OBSOLETE_KILL or
- * DST_OBSOLETE_DEAD by dst_free().
+ * DST_OBSOLETE_DEAD.
*/
if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt))
return NULL;
@@ -1233,7 +1239,7 @@ void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt)
rcu_read_lock();
if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0)
- src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res);
+ src = fib_result_prefsrc(dev_net(rt->dst.dev), &res);
else
src = inet_select_addr(rt->dst.dev,
rt_nexthop(rt, iph->daddr),
@@ -1352,9 +1358,9 @@ static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr)
u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr)
{
+ struct fib_nh_common *nhc = res->nhc;
+ struct net_device *dev = nhc->nhc_dev;
struct fib_info *fi = res->fi;
- struct fib_nh *nh = &fi->fib_nh[res->nh_sel];
- struct net_device *dev = nh->nh_dev;
u32 mtu = 0;
if (dev_net(dev)->ipv4.sysctl_ip_fwd_use_pmtu ||
@@ -1362,6 +1368,7 @@ u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr)
mtu = fi->fib_mtu;
if (likely(!mtu)) {
+ struct fib_nh *nh = container_of(nhc, struct fib_nh, nh_common);
struct fib_nh_exception *fnhe;
fnhe = find_exception(nh, daddr);
@@ -1372,7 +1379,7 @@ u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr)
if (likely(!mtu))
mtu = min(READ_ONCE(dev->mtu), IP_MAX_MTU);
- return mtu - lwtunnel_headroom(nh->nh_lwtstate, mtu);
+ return mtu - lwtunnel_headroom(nhc->nhc_lwtstate, mtu);
}
static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe,
@@ -1527,10 +1534,11 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
bool cached = false;
if (fi) {
- struct fib_nh *nh = &FIB_RES_NH(*res);
+ struct fib_nh_common *nhc = FIB_RES_NHC(*res);
+ struct fib_nh *nh = container_of(nhc, struct fib_nh, nh_common);
- if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) {
- rt->rt_gateway = nh->nh_gw;
+ if (nh->fib_nh_gw4 && nh->fib_nh_scope == RT_SCOPE_LINK) {
+ rt->rt_gateway = nh->fib_nh_gw4;
rt->rt_uses_gateway = 1;
}
ip_dst_init_metrics(&rt->dst, fi->fib_metrics);
@@ -1538,7 +1546,7 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
#ifdef CONFIG_IP_ROUTE_CLASSID
rt->dst.tclassid = nh->nh_tclassid;
#endif
- rt->dst.lwtstate = lwtstate_get(nh->nh_lwtstate);
+ rt->dst.lwtstate = lwtstate_get(nh->fib_nh_lws);
if (unlikely(fnhe))
cached = rt_bind_exception(rt, fnhe, daddr, do_cache);
else if (do_cache)
@@ -1697,15 +1705,18 @@ static int __mkroute_input(struct sk_buff *skb,
struct in_device *in_dev,
__be32 daddr, __be32 saddr, u32 tos)
{
+ struct fib_nh_common *nhc = FIB_RES_NHC(*res);
+ struct net_device *dev = nhc->nhc_dev;
struct fib_nh_exception *fnhe;
struct rtable *rth;
+ struct fib_nh *nh;
int err;
struct in_device *out_dev;
bool do_cache;
u32 itag = 0;
/* get a working reference to the output device */
- out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res));
+ out_dev = __in_dev_get_rcu(dev);
if (!out_dev) {
net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n");
return -EINVAL;
@@ -1722,10 +1733,13 @@ static int __mkroute_input(struct sk_buff *skb,
do_cache = res->fi && !itag;
if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) &&
- skb->protocol == htons(ETH_P_IP) &&
- (IN_DEV_SHARED_MEDIA(out_dev) ||
- inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res))))
- IPCB(skb)->flags |= IPSKB_DOREDIRECT;
+ skb->protocol == htons(ETH_P_IP)) {
+ __be32 gw = nhc->nhc_family == AF_INET ? nhc->nhc_gw.ipv4 : 0;
+
+ if (IN_DEV_SHARED_MEDIA(out_dev) ||
+ inet_addr_onlink(out_dev, saddr, gw))
+ IPCB(skb)->flags |= IPSKB_DOREDIRECT;
+ }
if (skb->protocol != htons(ETH_P_IP)) {
/* Not IP (i.e. ARP). Do not create route, if it is
@@ -1742,12 +1756,13 @@ static int __mkroute_input(struct sk_buff *skb,
}
}
- fnhe = find_exception(&FIB_RES_NH(*res), daddr);
+ nh = container_of(nhc, struct fib_nh, nh_common);
+ fnhe = find_exception(nh, daddr);
if (do_cache) {
if (fnhe)
rth = rcu_dereference(fnhe->fnhe_rth_input);
else
- rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input);
+ rth = rcu_dereference(nh->nh_rth_input);
if (rt_cache_valid(rth)) {
skb_dst_set_noref(skb, &rth->dst);
goto out;
@@ -2041,7 +2056,11 @@ local_input:
do_cache = false;
if (res->fi) {
if (!itag) {
- rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input);
+ struct fib_nh_common *nhc = FIB_RES_NHC(*res);
+ struct fib_nh *nh;
+
+ nh = container_of(nhc, struct fib_nh, nh_common);
+ rth = rcu_dereference(nh->nh_rth_input);
if (rt_cache_valid(rth)) {
skb_dst_set_noref(skb, &rth->dst);
err = 0;
@@ -2071,15 +2090,17 @@ local_input:
}
if (do_cache) {
- struct fib_nh *nh = &FIB_RES_NH(*res);
+ struct fib_nh_common *nhc = FIB_RES_NHC(*res);
+ struct fib_nh *nh;
- rth->dst.lwtstate = lwtstate_get(nh->nh_lwtstate);
+ rth->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate);
if (lwtunnel_input_redirect(rth->dst.lwtstate)) {
WARN_ON(rth->dst.input == lwtunnel_input);
rth->dst.lwtstate->orig_input = rth->dst.input;
rth->dst.input = lwtunnel_input;
}
+ nh = container_of(nhc, struct fib_nh, nh_common);
if (unlikely(!rt_cache_route(nh, rth)))
rt_add_uncached_list(rth);
}
@@ -2251,8 +2272,9 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
fnhe = NULL;
do_cache &= fi != NULL;
if (fi) {
+ struct fib_nh_common *nhc = FIB_RES_NHC(*res);
+ struct fib_nh *nh = container_of(nhc, struct fib_nh, nh_common);
struct rtable __rcu **prth;
- struct fib_nh *nh = &FIB_RES_NH(*res);
fnhe = find_exception(nh, fl4->daddr);
if (!do_cache)
@@ -2262,8 +2284,8 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
} else {
if (unlikely(fl4->flowi4_flags &
FLOWI_FLAG_KNOWN_NH &&
- !(nh->nh_gw &&
- nh->nh_scope == RT_SCOPE_LINK))) {
+ !(nhc->nhc_has_gw &&
+ nhc->nhc_scope == RT_SCOPE_LINK))) {
do_cache = false;
goto add;
}
generated by cgit v1.2.3 (git 2.46.0) at 2025-12-31 20:54:44 +0000