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1 From: Pablo Neira Ayuso <pablo@netfilter.org>
2 Date: Mon, 27 Nov 2017 22:50:26 +0100
3 Subject: [PATCH] netfilter: move reroute indirection to struct nf_ipv6_ops
4
5 We cannot make a direct call to nf_ip6_reroute() because that would result
6 in autoloading the 'ipv6' module because of symbol dependencies.
7 Therefore, define reroute indirection in nf_ipv6_ops where this really
8 belongs to.
9
10 For IPv4, we can indeed make a direct function call, which is faster,
11 given IPv4 is built-in in the networking code by default. Still,
12 CONFIG_INET=n and CONFIG_NETFILTER=y is possible, so define empty inline
13 stub for IPv4 in such case.
14
15 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
16 ---
17
18 --- a/include/linux/netfilter.h
19 +++ b/include/linux/netfilter.h
20 @@ -311,8 +311,6 @@ struct nf_queue_entry;
21
22 struct nf_afinfo {
23 unsigned short family;
24 - int (*reroute)(struct net *net, struct sk_buff *skb,
25 - const struct nf_queue_entry *entry);
26 int route_key_size;
27 };
28
29 @@ -331,6 +329,7 @@ __sum16 nf_checksum_partial(struct sk_bu
30 u_int8_t protocol, unsigned short family);
31 int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
32 bool strict, unsigned short family);
33 +int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry);
34
35 int nf_register_afinfo(const struct nf_afinfo *afinfo);
36 void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
37 --- a/include/linux/netfilter_ipv4.h
38 +++ b/include/linux/netfilter_ipv4.h
39 @@ -18,6 +18,8 @@ struct ip_rt_info {
40
41 int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned addr_type);
42
43 +struct nf_queue_entry;
44 +
45 #ifdef CONFIG_INET
46 __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
47 unsigned int dataoff, u_int8_t protocol);
48 @@ -26,6 +28,7 @@ __sum16 nf_ip_checksum_partial(struct sk
49 u_int8_t protocol);
50 int nf_ip_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
51 bool strict);
52 +int nf_ip_reroute(struct sk_buff *skb, const struct nf_queue_entry *entry);
53 #else
54 static inline __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
55 unsigned int dataoff, u_int8_t protocol)
56 @@ -45,6 +48,11 @@ static inline int nf_ip_route(struct net
57 {
58 return -EOPNOTSUPP;
59 }
60 +static inline int nf_ip_reroute(struct sk_buff *skb,
61 + const struct nf_queue_entry *entry)
62 +{
63 + return -EOPNOTSUPP;
64 +}
65 #endif /* CONFIG_INET */
66
67 #endif /*__LINUX_IP_NETFILTER_H*/
68 --- a/include/linux/netfilter_ipv6.h
69 +++ b/include/linux/netfilter_ipv6.h
70 @@ -18,6 +18,8 @@ struct ip6_rt_info {
71 u_int32_t mark;
72 };
73
74 +struct nf_queue_entry;
75 +
76 /*
77 * Hook functions for ipv6 to allow xt_* modules to be built-in even
78 * if IPv6 is a module.
79 @@ -35,6 +37,7 @@ struct nf_ipv6_ops {
80 u_int8_t protocol);
81 int (*route)(struct net *net, struct dst_entry **dst, struct flowi *fl,
82 bool strict);
83 + int (*reroute)(struct sk_buff *skb, const struct nf_queue_entry *entry);
84 };
85
86 #ifdef CONFIG_NETFILTER
87 --- a/net/bridge/netfilter/nf_tables_bridge.c
88 +++ b/net/bridge/netfilter/nf_tables_bridge.c
89 @@ -95,15 +95,8 @@ static const struct nf_chain_type filter
90 (1 << NF_BR_POST_ROUTING),
91 };
92
93 -static int nf_br_reroute(struct net *net, struct sk_buff *skb,
94 - const struct nf_queue_entry *entry)
95 -{
96 - return 0;
97 -}
98 -
99 static const struct nf_afinfo nf_br_afinfo = {
100 .family = AF_BRIDGE,
101 - .reroute = nf_br_reroute,
102 .route_key_size = 0,
103 };
104
105 --- a/net/ipv4/netfilter.c
106 +++ b/net/ipv4/netfilter.c
107 @@ -80,8 +80,7 @@ int ip_route_me_harder(struct net *net,
108 }
109 EXPORT_SYMBOL(ip_route_me_harder);
110
111 -static int nf_ip_reroute(struct net *net, struct sk_buff *skb,
112 - const struct nf_queue_entry *entry)
113 +int nf_ip_reroute(struct sk_buff *skb, const struct nf_queue_entry *entry)
114 {
115 const struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
116
117 @@ -92,10 +91,12 @@ static int nf_ip_reroute(struct net *net
118 skb->mark == rt_info->mark &&
119 iph->daddr == rt_info->daddr &&
120 iph->saddr == rt_info->saddr))
121 - return ip_route_me_harder(net, skb, RTN_UNSPEC);
122 + return ip_route_me_harder(entry->state.net, skb,
123 + RTN_UNSPEC);
124 }
125 return 0;
126 }
127 +EXPORT_SYMBOL_GPL(nf_ip_reroute);
128
129 __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
130 unsigned int dataoff, u_int8_t protocol)
131 @@ -163,7 +164,6 @@ EXPORT_SYMBOL_GPL(nf_ip_route);
132
133 static const struct nf_afinfo nf_ip_afinfo = {
134 .family = AF_INET,
135 - .reroute = nf_ip_reroute,
136 .route_key_size = sizeof(struct ip_rt_info),
137 };
138
139 --- a/net/ipv6/netfilter.c
140 +++ b/net/ipv6/netfilter.c
141 @@ -72,7 +72,7 @@ int ip6_route_me_harder(struct net *net,
142 }
143 EXPORT_SYMBOL(ip6_route_me_harder);
144
145 -static int nf_ip6_reroute(struct net *net, struct sk_buff *skb,
146 +static int nf_ip6_reroute(struct sk_buff *skb,
147 const struct nf_queue_entry *entry)
148 {
149 struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
150 @@ -82,7 +82,7 @@ static int nf_ip6_reroute(struct net *ne
151 if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
152 !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) ||
153 skb->mark != rt_info->mark)
154 - return ip6_route_me_harder(net, skb);
155 + return ip6_route_me_harder(entry->state.net, skb);
156 }
157 return 0;
158 }
159 @@ -175,11 +175,11 @@ static const struct nf_ipv6_ops ipv6ops
160 .checksum = nf_ip6_checksum,
161 .checksum_partial = nf_ip6_checksum_partial,
162 .route = nf_ip6_route,
163 + .reroute = nf_ip6_reroute,
164 };
165
166 static const struct nf_afinfo nf_ip6_afinfo = {
167 .family = AF_INET6,
168 - .reroute = nf_ip6_reroute,
169 .route_key_size = sizeof(struct ip6_rt_info),
170 };
171
172 --- a/net/netfilter/nf_queue.c
173 +++ b/net/netfilter/nf_queue.c
174 @@ -271,7 +271,6 @@ void nf_reinject(struct nf_queue_entry *
175 const struct nf_hook_entry *hook_entry;
176 const struct nf_hook_entries *hooks;
177 struct sk_buff *skb = entry->skb;
178 - const struct nf_afinfo *afinfo;
179 const struct net *net;
180 unsigned int i;
181 int err;
182 @@ -298,8 +297,7 @@ void nf_reinject(struct nf_queue_entry *
183 verdict = nf_hook_entry_hookfn(hook_entry, skb, &entry->state);
184
185 if (verdict == NF_ACCEPT) {
186 - afinfo = nf_get_afinfo(entry->state.pf);
187 - if (!afinfo || afinfo->reroute(entry->state.net, skb, entry) < 0)
188 + if (nf_reroute(skb, entry) < 0)
189 verdict = NF_DROP;
190 }
191
192 --- a/net/netfilter/utils.c
193 +++ b/net/netfilter/utils.c
194 @@ -2,6 +2,7 @@
195 #include <linux/netfilter.h>
196 #include <linux/netfilter_ipv4.h>
197 #include <linux/netfilter_ipv6.h>
198 +#include <net/netfilter/nf_queue.h>
199
200 __sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
201 unsigned int dataoff, u_int8_t protocol,
202 @@ -69,3 +70,21 @@ int nf_route(struct net *net, struct dst
203 return ret;
204 }
205 EXPORT_SYMBOL_GPL(nf_route);
206 +
207 +int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry)
208 +{
209 + const struct nf_ipv6_ops *v6ops;
210 + int ret = 0;
211 +
212 + switch (entry->state.pf) {
213 + case AF_INET:
214 + ret = nf_ip_reroute(skb, entry);
215 + break;
216 + case AF_INET6:
217 + v6ops = rcu_dereference(nf_ipv6_ops);
218 + if (v6ops)
219 + ret = v6ops->reroute(skb, entry);
220 + break;
221 + }
222 + return ret;
223 +}
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