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[openwrt/openwrt.git] / target / linux / generic / pending-4.19 / 670-ipv6-allow-rejecting-with-source-address-failed-policy.patch
1 From: Jonas Gorski <jogo@openwrt.org>
2 Subject: ipv6: allow rejecting with "source address failed policy"
3
4 RFC6204 L-14 requires rejecting traffic from invalid addresses with
5 ICMPv6 Destination Unreachable, Code 5 (Source address failed ingress/
6 egress policy) on the LAN side, so add an appropriate rule for that.
7
8 Signed-off-by: Jonas Gorski <jogo@openwrt.org>
9 ---
10 include/net/netns/ipv6.h | 1 +
11 include/uapi/linux/fib_rules.h | 4 +++
12 include/uapi/linux/rtnetlink.h | 1 +
13 net/ipv4/fib_semantics.c | 4 +++
14 net/ipv4/fib_trie.c | 1 +
15 net/ipv4/ipmr.c | 1 +
16 net/ipv6/fib6_rules.c | 4 +++
17 net/ipv6/ip6mr.c | 2 ++
18 net/ipv6/route.c | 58 +++++++++++++++++++++++++++++++++++++++++-
19 9 files changed, 75 insertions(+), 1 deletion(-)
20
21 --- a/include/net/netns/ipv6.h
22 +++ b/include/net/netns/ipv6.h
23 @@ -78,6 +78,7 @@ struct netns_ipv6 {
24 unsigned int fib6_rules_require_fldissect;
25 bool fib6_has_custom_rules;
26 struct rt6_info *ip6_prohibit_entry;
27 + struct rt6_info *ip6_policy_failed_entry;
28 struct rt6_info *ip6_blk_hole_entry;
29 struct fib6_table *fib6_local_tbl;
30 struct fib_rules_ops *fib6_rules_ops;
31 --- a/include/uapi/linux/fib_rules.h
32 +++ b/include/uapi/linux/fib_rules.h
33 @@ -82,6 +82,10 @@ enum {
34 FR_ACT_BLACKHOLE, /* Drop without notification */
35 FR_ACT_UNREACHABLE, /* Drop with ENETUNREACH */
36 FR_ACT_PROHIBIT, /* Drop with EACCES */
37 + FR_ACT_RES9,
38 + FR_ACT_RES10,
39 + FR_ACT_RES11,
40 + FR_ACT_POLICY_FAILED, /* Drop with EACCES */
41 __FR_ACT_MAX,
42 };
43
44 --- a/include/uapi/linux/rtnetlink.h
45 +++ b/include/uapi/linux/rtnetlink.h
46 @@ -228,6 +228,7 @@ enum {
47 RTN_THROW, /* Not in this table */
48 RTN_NAT, /* Translate this address */
49 RTN_XRESOLVE, /* Use external resolver */
50 + RTN_POLICY_FAILED, /* Failed ingress/egress policy */
51 __RTN_MAX
52 };
53
54 --- a/net/ipv4/fib_semantics.c
55 +++ b/net/ipv4/fib_semantics.c
56 @@ -139,6 +139,10 @@ const struct fib_prop fib_props[RTN_MAX
57 .error = -EINVAL,
58 .scope = RT_SCOPE_NOWHERE,
59 },
60 + [RTN_POLICY_FAILED] = {
61 + .error = -EACCES,
62 + .scope = RT_SCOPE_UNIVERSE,
63 + },
64 };
65
66 static void rt_fibinfo_free(struct rtable __rcu **rtp)
67 --- a/net/ipv4/fib_trie.c
68 +++ b/net/ipv4/fib_trie.c
69 @@ -2474,6 +2474,7 @@ static const char *const rtn_type_names[
70 [RTN_THROW] = "THROW",
71 [RTN_NAT] = "NAT",
72 [RTN_XRESOLVE] = "XRESOLVE",
73 + [RTN_POLICY_FAILED] = "POLICY_FAILED",
74 };
75
76 static inline const char *rtn_type(char *buf, size_t len, unsigned int t)
77 --- a/net/ipv4/ipmr.c
78 +++ b/net/ipv4/ipmr.c
79 @@ -179,6 +179,7 @@ static int ipmr_rule_action(struct fib_r
80 case FR_ACT_UNREACHABLE:
81 return -ENETUNREACH;
82 case FR_ACT_PROHIBIT:
83 + case FR_ACT_POLICY_FAILED:
84 return -EACCES;
85 case FR_ACT_BLACKHOLE:
86 default:
87 --- a/net/ipv6/fib6_rules.c
88 +++ b/net/ipv6/fib6_rules.c
89 @@ -221,6 +221,10 @@ static int __fib6_rule_action(struct fib
90 err = -EACCES;
91 rt = net->ipv6.ip6_prohibit_entry;
92 goto discard_pkt;
93 + case FR_ACT_POLICY_FAILED:
94 + err = -EACCES;
95 + rt = net->ipv6.ip6_policy_failed_entry;
96 + goto discard_pkt;
97 }
98
99 tb_id = fib_rule_get_table(rule, arg);
100 --- a/net/ipv6/ip6mr.c
101 +++ b/net/ipv6/ip6mr.c
102 @@ -162,6 +162,8 @@ static int ip6mr_rule_action(struct fib_
103 return -ENETUNREACH;
104 case FR_ACT_PROHIBIT:
105 return -EACCES;
106 + case FR_ACT_POLICY_FAILED:
107 + return -EACCES;
108 case FR_ACT_BLACKHOLE:
109 default:
110 return -EINVAL;
111 --- a/net/ipv6/route.c
112 +++ b/net/ipv6/route.c
113 @@ -97,6 +97,8 @@ static int ip6_pkt_discard(struct sk_bu
114 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
115 static int ip6_pkt_prohibit(struct sk_buff *skb);
116 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
117 +static int ip6_pkt_policy_failed(struct sk_buff *skb);
118 +static int ip6_pkt_policy_failed_out(struct net *net, struct sock *sk, struct sk_buff *skb);
119 static void ip6_link_failure(struct sk_buff *skb);
120 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
121 struct sk_buff *skb, u32 mtu);
122 @@ -326,6 +328,18 @@ static const struct rt6_info ip6_prohibi
123 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
124 };
125
126 +static const struct rt6_info ip6_policy_failed_entry_template = {
127 + .dst = {
128 + .__refcnt = ATOMIC_INIT(1),
129 + .__use = 1,
130 + .obsolete = DST_OBSOLETE_FORCE_CHK,
131 + .error = -EACCES,
132 + .input = ip6_pkt_policy_failed,
133 + .output = ip6_pkt_policy_failed_out,
134 + },
135 + .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
136 +};
137 +
138 static const struct rt6_info ip6_blk_hole_entry_template = {
139 .dst = {
140 .__refcnt = ATOMIC_INIT(1),
141 @@ -900,6 +914,7 @@ static const int fib6_prop[RTN_MAX + 1]
142 [RTN_BLACKHOLE] = -EINVAL,
143 [RTN_UNREACHABLE] = -EHOSTUNREACH,
144 [RTN_PROHIBIT] = -EACCES,
145 + [RTN_POLICY_FAILED] = -EACCES,
146 [RTN_THROW] = -EAGAIN,
147 [RTN_NAT] = -EINVAL,
148 [RTN_XRESOLVE] = -EINVAL,
149 @@ -937,6 +952,10 @@ static void ip6_rt_init_dst_reject(struc
150 rt->dst.output = ip6_pkt_prohibit_out;
151 rt->dst.input = ip6_pkt_prohibit;
152 break;
153 + case RTN_POLICY_FAILED:
154 + rt->dst.output = ip6_pkt_policy_failed_out;
155 + rt->dst.input = ip6_pkt_policy_failed;
156 + break;
157 case RTN_THROW:
158 case RTN_UNREACHABLE:
159 default:
160 @@ -3758,6 +3777,17 @@ static int ip6_pkt_prohibit_out(struct n
161 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
162 }
163
164 +static int ip6_pkt_policy_failed(struct sk_buff *skb)
165 +{
166 + return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_INNOROUTES);
167 +}
168 +
169 +static int ip6_pkt_policy_failed_out(struct net *net, struct sock *sk, struct sk_buff *skb)
170 +{
171 + skb->dev = skb_dst(skb)->dev;
172 + return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_OUTNOROUTES);
173 +}
174 +
175 /*
176 * Allocate a dst for local (unicast / anycast) address.
177 */
178 @@ -4205,7 +4235,8 @@ static int rtm_to_fib6_config(struct sk_
179 if (rtm->rtm_type == RTN_UNREACHABLE ||
180 rtm->rtm_type == RTN_BLACKHOLE ||
181 rtm->rtm_type == RTN_PROHIBIT ||
182 - rtm->rtm_type == RTN_THROW)
183 + rtm->rtm_type == RTN_THROW ||
184 + rtm->rtm_type == RTN_POLICY_FAILED)
185 cfg->fc_flags |= RTF_REJECT;
186
187 if (rtm->rtm_type == RTN_LOCAL)
188 @@ -5053,6 +5084,8 @@ static int ip6_route_dev_notify(struct n
189 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
190 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
191 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
192 + net->ipv6.ip6_policy_failed_entry->dst.dev = dev;
193 + net->ipv6.ip6_policy_failed_entry->rt6i_idev = in6_dev_get(dev);
194 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
195 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
196 #endif
197 @@ -5064,6 +5097,7 @@ static int ip6_route_dev_notify(struct n
198 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
199 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
200 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
201 + in6_dev_put_clear(&net->ipv6.ip6_policy_failed_entry->rt6i_idev);
202 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
203 #endif
204 }
205 @@ -5258,6 +5292,15 @@ static int __net_init ip6_route_net_init
206 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
207 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
208 ip6_template_metrics, true);
209 +
210 + net->ipv6.ip6_policy_failed_entry =
211 + kmemdup(&ip6_policy_failed_entry_template,
212 + sizeof(*net->ipv6.ip6_policy_failed_entry), GFP_KERNEL);
213 + if (!net->ipv6.ip6_policy_failed_entry)
214 + goto out_ip6_blk_hole_entry;
215 + net->ipv6.ip6_policy_failed_entry->dst.ops = &net->ipv6.ip6_dst_ops;
216 + dst_init_metrics(&net->ipv6.ip6_policy_failed_entry->dst,
217 + ip6_template_metrics, true);
218 #endif
219
220 net->ipv6.sysctl.flush_delay = 0;
221 @@ -5276,6 +5319,8 @@ out:
222 return ret;
223
224 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
225 +out_ip6_blk_hole_entry:
226 + kfree(net->ipv6.ip6_blk_hole_entry);
227 out_ip6_prohibit_entry:
228 kfree(net->ipv6.ip6_prohibit_entry);
229 out_ip6_null_entry:
230 @@ -5296,6 +5341,7 @@ static void __net_exit ip6_route_net_exi
231 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
232 kfree(net->ipv6.ip6_prohibit_entry);
233 kfree(net->ipv6.ip6_blk_hole_entry);
234 + kfree(net->ipv6.ip6_policy_failed_entry);
235 #endif
236 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
237 }
238 @@ -5372,6 +5418,9 @@ void __init ip6_route_init_special_entri
239 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
240 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
241 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
242 + init_net.ipv6.ip6_policy_failed_entry->dst.dev = init_net.loopback_dev;
243 + init_net.ipv6.ip6_policy_failed_entry->rt6i_idev =
244 + in6_dev_get(init_net.loopback_dev);
245 #endif
246 }
247
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