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Diffstat (limited to 'net/ipv4/fib_frontend.c')
-rw-r--r--net/ipv4/fib_frontend.c182
1 files changed, 135 insertions, 47 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index ed14ec245584..577db1d50a24 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
@@ -6,11 +7,6 @@
* IPv4 Forwarding Information Base: FIB frontend.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
@@ -43,6 +39,7 @@
#include <net/sock.h>
#include <net/arp.h>
#include <net/ip_fib.h>
+#include <net/nexthop.h>
#include <net/rtnetlink.h>
#include <net/xfrm.h>
#include <net/l3mdev.h>
@@ -73,11 +70,6 @@ fail:
fib_free_table(main_table);
return -ENOMEM;
}
-
-static bool fib4_has_custom_rules(struct net *net)
-{
- return false;
-}
#else
struct fib_table *fib_new_table(struct net *net, u32 id)
@@ -127,17 +119,13 @@ struct fib_table *fib_get_table(struct net *net, u32 id)
h = id & (FIB_TABLE_HASHSZ - 1);
head = &net->ipv4.fib_table_hash[h];
- hlist_for_each_entry_rcu(tb, head, tb_hlist) {
+ hlist_for_each_entry_rcu(tb, head, tb_hlist,
+ lockdep_rtnl_is_held()) {
if (tb->tb_id == id)
return tb;
}
return NULL;
}
-
-static bool fib4_has_custom_rules(struct net *net)
-{
- return net->ipv4.fib_has_custom_rules;
-}
#endif /* CONFIG_IP_MULTIPLE_TABLES */
static void fib_replace_table(struct net *net, struct fib_table *old,
@@ -192,7 +180,7 @@ int fib_unmerge(struct net *net)
return 0;
}
-static void fib_flush(struct net *net)
+void fib_flush(struct net *net)
{
int flushed = 0;
unsigned int h;
@@ -234,7 +222,9 @@ static inline unsigned int __inet_dev_addr_type(struct net *net,
if (table) {
ret = RTN_UNICAST;
if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) {
- if (!dev || dev == res.fi->fib_dev)
+ struct fib_nh_common *nhc = fib_info_nhc(res.fi, 0);
+
+ if (!dev || dev == nhc->nhc_dev)
ret = res.type;
}
}
@@ -307,7 +297,7 @@ __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;
}
@@ -321,19 +311,19 @@ bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev)
#ifdef CONFIG_IP_ROUTE_MULTIPATH
int ret;
- for (ret = 0; ret < fi->fib_nhs; ret++) {
- struct fib_nh *nh = &fi->fib_nh[ret];
+ for (ret = 0; ret < fib_info_num_path(fi); ret++) {
+ const struct fib_nh_common *nhc = fib_info_nhc(fi, ret);
- if (nh->nh_dev == dev) {
+ if (nhc->nhc_dev == dev) {
dev_match = true;
break;
- } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) {
+ } else if (l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex) {
dev_match = true;
break;
}
}
#else
- if (fi->fib_nh[0].nh_dev == dev)
+ if (fib_info_nhc(fi, 0)->nhc_dev == dev)
dev_match = true;
#endif
@@ -389,8 +379,13 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
fib_combine_itag(itag, &res);
dev_match = fib_info_nh_uses_dev(res.fi, dev);
+ /* This is not common, loopback packets retain skb_dst so normally they
+ * would not even hit this slow path.
+ */
+ dev_match = dev_match || (res.type == RTN_LOCAL &&
+ dev == net->loopback_dev);
if (dev_match) {
- ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
+ ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST;
return ret;
}
if (no_addr)
@@ -402,7 +397,7 @@ 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).nh_scope >= RT_SCOPE_HOST;
+ ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST;
}
return ret;
@@ -540,14 +535,22 @@ static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
cfg->fc_oif = dev->ifindex;
cfg->fc_table = l3mdev_fib_table(dev);
if (colon) {
- struct in_ifaddr *ifa;
- struct in_device *in_dev = __in_dev_get_rtnl(dev);
+ const struct in_ifaddr *ifa;
+ struct in_device *in_dev;
+
+ in_dev = __in_dev_get_rtnl(dev);
if (!in_dev)
return -ENODEV;
+
*colon = ':';
- for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
+
+ rcu_read_lock();
+ in_dev_for_each_ifa_rcu(ifa, in_dev) {
if (strcmp(ifa->ifa_label, devname) == 0)
break;
+ }
+ rcu_read_unlock();
+
if (!ifa)
return -ENODEV;
cfg->fc_prefsrc = ifa->ifa_local;
@@ -558,7 +561,8 @@ static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
if (rt->rt_gateway.sa_family == AF_INET && addr) {
unsigned int addr_type;
- cfg->fc_gw = addr;
+ cfg->fc_gw4 = addr;
+ cfg->fc_gw_family = AF_INET;
addr_type = inet_addr_type_table(net, addr, cfg->fc_table);
if (rt->rt_flags & RTF_GATEWAY &&
addr_type == RTN_UNICAST)
@@ -568,7 +572,7 @@ static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
if (cmd == SIOCDELRT)
return 0;
- if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
+ if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw_family)
return -EINVAL;
if (cfg->fc_scope == RT_SCOPE_NOWHERE)
@@ -644,6 +648,7 @@ int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt)
}
const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
+ [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 },
[RTA_DST] = { .type = NLA_U32 },
[RTA_SRC] = { .type = NLA_U32 },
[RTA_IIF] = { .type = NLA_U32 },
@@ -662,18 +667,64 @@ const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
[RTA_IP_PROTO] = { .type = NLA_U8 },
[RTA_SPORT] = { .type = NLA_U16 },
[RTA_DPORT] = { .type = NLA_U16 },
+ [RTA_NH_ID] = { .type = NLA_U32 },
};
+int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla,
+ struct netlink_ext_ack *extack)
+{
+ struct rtvia *via;
+ int alen;
+
+ if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
+ NL_SET_ERR_MSG(extack, "Invalid attribute length for RTA_VIA");
+ return -EINVAL;
+ }
+
+ via = nla_data(nla);
+ alen = nla_len(nla) - offsetof(struct rtvia, rtvia_addr);
+
+ switch (via->rtvia_family) {
+ case AF_INET:
+ if (alen != sizeof(__be32)) {
+ NL_SET_ERR_MSG(extack, "Invalid IPv4 address in RTA_VIA");
+ return -EINVAL;
+ }
+ cfg->fc_gw_family = AF_INET;
+ cfg->fc_gw4 = *((__be32 *)via->rtvia_addr);
+ break;
+ case AF_INET6:
+#ifdef CONFIG_IPV6
+ if (alen != sizeof(struct in6_addr)) {
+ NL_SET_ERR_MSG(extack, "Invalid IPv6 address in RTA_VIA");
+ return -EINVAL;
+ }
+ cfg->fc_gw_family = AF_INET6;
+ cfg->fc_gw6 = *((struct in6_addr *)via->rtvia_addr);
+#else
+ NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel");
+ return -EINVAL;
+#endif
+ break;
+ default:
+ NL_SET_ERR_MSG(extack, "Unsupported address family in RTA_VIA");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
struct nlmsghdr *nlh, struct fib_config *cfg,
struct netlink_ext_ack *extack)
{
+ bool has_gw = false, has_via = false;
struct nlattr *attr;
int err, remaining;
struct rtmsg *rtm;
- err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
- extack);
+ err = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX,
+ rtm_ipv4_policy, extack);
if (err < 0)
goto errout;
@@ -708,12 +759,17 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
cfg->fc_oif = nla_get_u32(attr);
break;
case RTA_GATEWAY:
- cfg->fc_gw = nla_get_be32(attr);
+ has_gw = true;
+ cfg->fc_gw4 = nla_get_be32(attr);
+ if (cfg->fc_gw4)
+ cfg->fc_gw_family = AF_INET;
break;
case RTA_VIA:
- NL_SET_ERR_MSG(extack, "IPv4 does not support RTA_VIA attribute");
- err = -EINVAL;
- goto errout;
+ has_via = true;
+ err = fib_gw_from_via(cfg, attr, extack);
+ if (err)
+ goto errout;
+ break;
case RTA_PRIORITY:
cfg->fc_priority = nla_get_u32(attr);
break;
@@ -749,9 +805,27 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
if (err < 0)
goto errout;
break;
+ case RTA_NH_ID:
+ cfg->fc_nh_id = nla_get_u32(attr);
+ break;
+ }
+ }
+
+ if (cfg->fc_nh_id) {
+ if (cfg->fc_oif || cfg->fc_gw_family ||
+ cfg->fc_encap || cfg->fc_mp) {
+ NL_SET_ERR_MSG(extack,
+ "Nexthop specification and nexthop id are mutually exclusive");
+ return -EINVAL;
}
}
+ if (has_gw && has_via) {
+ NL_SET_ERR_MSG(extack,
+ "Nexthop configuration can not contain both GATEWAY and VIA");
+ goto errout;
+ }
+
return 0;
errout:
return err;
@@ -769,6 +843,12 @@ static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
goto errout;
+ if (cfg.fc_nh_id && !nexthop_find_by_id(net, cfg.fc_nh_id)) {
+ NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
+ err = -EINVAL;
+ goto errout;
+ }
+
tb = fib_get_table(net, cfg.fc_table);
if (!tb) {
NL_SET_ERR_MSG(extack, "FIB table does not exist");
@@ -828,10 +908,15 @@ int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
NL_SET_ERR_MSG(extack, "Invalid values in header for FIB dump request");
return -EINVAL;
}
+
if (rtm->rtm_flags & ~(RTM_F_CLONED | RTM_F_PREFIX)) {
NL_SET_ERR_MSG(extack, "Invalid flags for FIB dump request");
return -EINVAL;
}
+ if (rtm->rtm_flags & RTM_F_CLONED)
+ filter->dump_routes = false;
+ else
+ filter->dump_exceptions = false;
filter->dump_all_families = (rtm->rtm_family == AF_UNSPEC);
filter->flags = rtm->rtm_flags;
@@ -839,8 +924,8 @@ int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
filter->rt_type = rtm->rtm_type;
filter->table_id = rtm->rtm_table;
- err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
- rtm_ipv4_policy, extack);
+ err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
+ rtm_ipv4_policy, extack);
if (err < 0)
return err;
@@ -878,9 +963,10 @@ EXPORT_SYMBOL_GPL(ip_valid_fib_dump_req);
static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
{
+ struct fib_dump_filter filter = { .dump_routes = true,
+ .dump_exceptions = true };
const struct nlmsghdr *nlh = cb->nlh;
struct net *net = sock_net(skb->sk);
- struct fib_dump_filter filter = {};
unsigned int h, s_h;
unsigned int e = 0, s_e;
struct fib_table *tb;
@@ -897,8 +983,8 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
filter.flags = rtm->rtm_flags & (RTM_F_PREFIX | RTM_F_CLONED);
}
- /* fib entries are never clones and ipv4 does not use prefix flag */
- if (filter.flags & (RTM_F_PREFIX | RTM_F_CLONED))
+ /* ipv4 does not use prefix flag */
+ if (filter.flags & RTM_F_PREFIX)
return skb->len;
if (filter.table_id) {
@@ -1052,7 +1138,7 @@ void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric)
if (!(dev->flags & IFF_UP) ||
ifa->ifa_flags & (IFA_F_SECONDARY | IFA_F_NOPREFIXROUTE) ||
ipv4_is_zeronet(prefix) ||
- prefix == ifa->ifa_local || ifa->ifa_prefixlen == 32)
+ (prefix == ifa->ifa_local && ifa->ifa_prefixlen == 32))
return;
/* add the new */
@@ -1119,8 +1205,8 @@ void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
*
* Scan address list to be sure that addresses are really gone.
*/
-
- for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
+ rcu_read_lock();
+ in_dev_for_each_ifa_rcu(ifa1, in_dev) {
if (ifa1 == ifa) {
/* promotion, keep the IP */
gone = 0;
@@ -1188,6 +1274,7 @@ void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
}
}
}
+ rcu_read_unlock();
no_promotions:
if (!(ok & BRD_OK))
@@ -1357,6 +1444,7 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
struct netdev_notifier_info_ext *info_ext = ptr;
struct in_device *in_dev;
struct net *net = dev_net(dev);
+ struct in_ifaddr *ifa;
unsigned int flags;
if (event == NETDEV_UNREGISTER) {
@@ -1371,9 +1459,9 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
switch (event) {
case NETDEV_UP:
- for_ifa(in_dev) {
+ in_dev_for_each_ifa_rtnl(ifa, in_dev) {
fib_add_ifaddr(ifa);
- } endfor_ifa(in_dev);
+ }
#ifdef CONFIG_IP_ROUTE_MULTIPATH
fib_sync_up(dev, RTNH_F_DEAD);
#endif
generated by cgit v1.2.3 (git 2.39.0) at 2025-12-17 02:59:44 +0300