aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/generic/pending-4.19/670-ipv6-allow-rejecting-with-source-address-failed-policy.patch
blob: cfdfe1083686fd0d677119c20e8a642ad73e06a6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
From: Jonas Gorski <jogo@openwrt.org>
Subject: ipv6: allow rejecting with "source address failed policy"

RFC6204 L-14 requires rejecting traffic from invalid addresses with
ICMPv6 Destination Unreachable, Code 5 (Source address failed ingress/
egress policy) on the LAN side, so add an appropriate rule for that.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
---
 include/net/netns/ipv6.h       |  1 +
 include/uapi/linux/fib_rules.h |  4 +++
 include/uapi/linux/rtnetlink.h |  1 +
 net/ipv4/fib_semantics.c       |  4 +++
 net/ipv4/fib_trie.c            |  1 +
 net/ipv4/ipmr.c                |  1 +
 net/ipv6/fib6_rules.c          |  4 +++
 net/ipv6/ip6mr.c               |  2 ++
 net/ipv6/route.c               | 58 +++++++++++++++++++++++++++++++++++++++++-
 9 files changed, 75 insertions(+), 1 deletion(-)

--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -78,6 +78,7 @@ struct netns_ipv6 {
 	unsigned int		fib6_rules_require_fldissect;
 	bool			fib6_has_custom_rules;
 	struct rt6_info         *ip6_prohibit_entry;
+	struct rt6_info		*ip6_policy_failed_entry;
 	struct rt6_info         *ip6_blk_hole_entry;
 	struct fib6_table       *fib6_local_tbl;
 	struct fib_rules_ops    *fib6_rules_ops;
--- a/include/uapi/linux/fib_rules.h
+++ b/include/uapi/linux/fib_rules.h
@@ -82,6 +82,10 @@ enum {
 	FR_ACT_BLACKHOLE,	/* Drop without notification */
 	FR_ACT_UNREACHABLE,	/* Drop with ENETUNREACH */
 	FR_ACT_PROHIBIT,	/* Drop with EACCES */
+	FR_ACT_RES9,
+	FR_ACT_RES10,
+	FR_ACT_RES11,
+	FR_ACT_POLICY_FAILED,	/* Drop with EACCES */
 	__FR_ACT_MAX,
 };
 
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -228,6 +228,7 @@ enum {
 	RTN_THROW,		/* Not in this table		*/
 	RTN_NAT,		/* Translate this address	*/
 	RTN_XRESOLVE,		/* Use external resolver	*/
+	RTN_POLICY_FAILED,	/* Failed ingress/egress policy */
 	__RTN_MAX
 };
 
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -139,6 +139,10 @@ const struct fib_prop fib_props[RTN_MAX
 		.error	= -EINVAL,
 		.scope	= RT_SCOPE_NOWHERE,
 	},
+	[RTN_POLICY_FAILED] = {
+		.error	= -EACCES,
+		.scope	= RT_SCOPE_UNIVERSE,
+	},
 };
 
 static void rt_fibinfo_free(struct rtable __rcu **rtp)
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -2474,6 +2474,7 @@ static const char *const rtn_type_names[
 	[RTN_THROW] = "THROW",
 	[RTN_NAT] = "NAT",
 	[RTN_XRESOLVE] = "XRESOLVE",
+	[RTN_POLICY_FAILED] = "POLICY_FAILED",
 };
 
 static inline const char *rtn_type(char *buf, size_t len, unsigned int t)
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -179,6 +179,7 @@ static int ipmr_rule_action(struct fib_r
 	case FR_ACT_UNREACHABLE:
 		return -ENETUNREACH;
 	case FR_ACT_PROHIBIT:
+	case FR_ACT_POLICY_FAILED:
 		return -EACCES;
 	case FR_ACT_BLACKHOLE:
 	default:
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -221,6 +221,10 @@ static int __fib6_rule_action(struct fib
 		err = -EACCES;
 		rt = net->ipv6.ip6_prohibit_entry;
 		goto discard_pkt;
+	case FR_ACT_POLICY_FAILED:
+		err = -EACCES;
+		rt = net->ipv6.ip6_policy_failed_entry;
+		goto discard_pkt;
 	}
 
 	tb_id = fib_rule_get_table(rule, arg);
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -162,6 +162,8 @@ static int ip6mr_rule_action(struct fib_
 		return -ENETUNREACH;
 	case FR_ACT_PROHIBIT:
 		return -EACCES;
+	case FR_ACT_POLICY_FAILED:
+		return -EACCES;
 	case FR_ACT_BLACKHOLE:
 	default:
 		return -EINVAL;
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -97,6 +97,8 @@ static int		ip6_pkt_discard(struct sk_bu
 static int		ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
 static int		ip6_pkt_prohibit(struct sk_buff *skb);
 static int		ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
+static int		ip6_pkt_policy_failed(struct sk_buff *skb);
+static int		ip6_pkt_policy_failed_out(struct net *net, struct sock *sk, struct sk_buff *skb);
 static void		ip6_link_failure(struct sk_buff *skb);
 static void		ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
 					   struct sk_buff *skb, u32 mtu,
@@ -328,6 +330,18 @@ static const struct rt6_info ip6_prohibi
 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
 };
 
+static const struct rt6_info ip6_policy_failed_entry_template = {
+	.dst = {
+		.__refcnt	= ATOMIC_INIT(1),
+		.__use		= 1,
+		.obsolete	= DST_OBSOLETE_FORCE_CHK,
+		.error		= -EACCES,
+		.input		= ip6_pkt_policy_failed,
+		.output		= ip6_pkt_policy_failed_out,
+	},
+	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
+};
+
 static const struct rt6_info ip6_blk_hole_entry_template = {
 	.dst = {
 		.__refcnt	= ATOMIC_INIT(1),
@@ -906,6 +920,7 @@ static const int fib6_prop[RTN_MAX + 1]
 	[RTN_BLACKHOLE]	= -EINVAL,
 	[RTN_UNREACHABLE] = -EHOSTUNREACH,
 	[RTN_PROHIBIT]	= -EACCES,
+	[RTN_POLICY_FAILED] = -EACCES,
 	[RTN_THROW]	= -EAGAIN,
 	[RTN_NAT]	= -EINVAL,
 	[RTN_XRESOLVE]	= -EINVAL,
@@ -943,6 +958,10 @@ static void ip6_rt_init_dst_reject(struc
 		rt->dst.output = ip6_pkt_prohibit_out;
 		rt->dst.input = ip6_pkt_prohibit;
 		break;
+	case RTN_POLICY_FAILED:
+		rt->dst.output = ip6_pkt_policy_failed_out;
+		rt->dst.input = ip6_pkt_policy_failed;
+		break;
 	case RTN_THROW:
 	case RTN_UNREACHABLE:
 	default:
@@ -3789,6 +3808,17 @@ static int ip6_pkt_prohibit_out(struct n
 	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
 }
 
+static int ip6_pkt_policy_failed(struct sk_buff *skb)
+{
+	return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_INNOROUTES);
+}
+
+static int ip6_pkt_policy_failed_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+	skb->dev = skb_dst(skb)->dev;
+	return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_OUTNOROUTES);
+}
+
 /*
  *	Allocate a dst for local (unicast / anycast) address.
  */
@@ -4236,7 +4266,8 @@ static int rtm_to_fib6_config(struct sk_
 	if (rtm->rtm_type == RTN_UNREACHABLE ||
 	    rtm->rtm_type == RTN_BLACKHOLE ||
 	    rtm->rtm_type == RTN_PROHIBIT ||
-	    rtm->rtm_type == RTN_THROW)
+	    rtm->rtm_type == RTN_THROW ||
+	    rtm->rtm_type == RTN_POLICY_FAILED)
 		cfg->fc_flags |= RTF_REJECT;
 
 	if (rtm->rtm_type == RTN_LOCAL)
@@ -5085,6 +5116,8 @@ static int ip6_route_dev_notify(struct n
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 		net->ipv6.ip6_prohibit_entry->dst.dev = dev;
 		net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
+		net->ipv6.ip6_policy_failed_entry->dst.dev = dev;
+		net->ipv6.ip6_policy_failed_entry->rt6i_idev = in6_dev_get(dev);
 		net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
 		net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
 #endif
@@ -5096,6 +5129,7 @@ static int ip6_route_dev_notify(struct n
 		in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 		in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
+		in6_dev_put_clear(&net->ipv6.ip6_policy_failed_entry->rt6i_idev);
 		in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
 #endif
 	}
@@ -5290,6 +5324,15 @@ static int __net_init ip6_route_net_init
 	net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
 	dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
 			 ip6_template_metrics, true);
+
+	net->ipv6.ip6_policy_failed_entry =
+		kmemdup(&ip6_policy_failed_entry_template,
+			sizeof(*net->ipv6.ip6_policy_failed_entry), GFP_KERNEL);
+	if (!net->ipv6.ip6_policy_failed_entry)
+		goto out_ip6_blk_hole_entry;
+	net->ipv6.ip6_policy_failed_entry->dst.ops = &net->ipv6.ip6_dst_ops;
+	dst_init_metrics(&net->ipv6.ip6_policy_failed_entry->dst,
+			 ip6_template_metrics, true);
 #endif
 
 	net->ipv6.sysctl.flush_delay = 0;
@@ -5308,6 +5351,8 @@ out:
 	return ret;
 
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
+out_ip6_blk_hole_entry:
+	kfree(net->ipv6.ip6_blk_hole_entry);
 out_ip6_prohibit_entry:
 	kfree(net->ipv6.ip6_prohibit_entry);
 out_ip6_null_entry:
@@ -5328,6 +5373,7 @@ static void __net_exit ip6_route_net_exi
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 	kfree(net->ipv6.ip6_prohibit_entry);
 	kfree(net->ipv6.ip6_blk_hole_entry);
+	kfree(net->ipv6.ip6_policy_failed_entry);
 #endif
 	dst_entries_destroy(&net->ipv6.ip6_dst_ops);
 }
@@ -5404,6 +5450,9 @@ void __init ip6_route_init_special_entri
 	init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
 	init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
 	init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+	init_net.ipv6.ip6_policy_failed_entry->dst.dev = init_net.loopback_dev;
+	init_net.ipv6.ip6_policy_failed_entry->rt6i_idev =
+		in6_dev_get(init_net.loopback_dev);
   #endif
 }