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1 From: Pablo Neira Ayuso <pablo@netfilter.org>
2 Date: Wed, 20 Dec 2017 16:12:55 +0100
3 Subject: [PATCH] netfilter: remove saveroute indirection in struct nf_afinfo
4
5 This is only used by nf_queue.c and this function comes with no symbol
6 dependencies with IPv6, it just refers to structure layouts. Therefore,
7 we can replace it by a direct function call from where it belongs.
8
9 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
10 ---
11
12 --- a/include/linux/netfilter.h
13 +++ b/include/linux/netfilter.h
14 @@ -313,8 +313,6 @@ struct nf_afinfo {
15 unsigned short family;
16 int (*route)(struct net *net, struct dst_entry **dst,
17 struct flowi *fl, bool strict);
18 - void (*saveroute)(const struct sk_buff *skb,
19 - struct nf_queue_entry *entry);
20 int (*reroute)(struct net *net, struct sk_buff *skb,
21 const struct nf_queue_entry *entry);
22 int route_key_size;
23 --- a/include/linux/netfilter_ipv4.h
24 +++ b/include/linux/netfilter_ipv4.h
25 @@ -6,6 +6,16 @@
26
27 #include <uapi/linux/netfilter_ipv4.h>
28
29 +/* Extra routing may needed on local out, as the QUEUE target never returns
30 + * control to the table.
31 + */
32 +struct ip_rt_info {
33 + __be32 daddr;
34 + __be32 saddr;
35 + u_int8_t tos;
36 + u_int32_t mark;
37 +};
38 +
39 int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned addr_type);
40
41 #ifdef CONFIG_INET
42 --- a/include/linux/netfilter_ipv6.h
43 +++ b/include/linux/netfilter_ipv6.h
44 @@ -9,6 +9,15 @@
45
46 #include <uapi/linux/netfilter_ipv6.h>
47
48 +/* Extra routing may needed on local out, as the QUEUE target never returns
49 + * control to the table.
50 + */
51 +struct ip6_rt_info {
52 + struct in6_addr daddr;
53 + struct in6_addr saddr;
54 + u_int32_t mark;
55 +};
56 +
57 /*
58 * Hook functions for ipv6 to allow xt_* modules to be built-in even
59 * if IPv6 is a module.
60 --- a/net/bridge/netfilter/nf_tables_bridge.c
61 +++ b/net/bridge/netfilter/nf_tables_bridge.c
62 @@ -95,11 +95,6 @@ static const struct nf_chain_type filter
63 (1 << NF_BR_POST_ROUTING),
64 };
65
66 -static void nf_br_saveroute(const struct sk_buff *skb,
67 - struct nf_queue_entry *entry)
68 -{
69 -}
70 -
71 static int nf_br_reroute(struct net *net, struct sk_buff *skb,
72 const struct nf_queue_entry *entry)
73 {
74 @@ -115,7 +110,6 @@ static int nf_br_route(struct net *net,
75 static const struct nf_afinfo nf_br_afinfo = {
76 .family = AF_BRIDGE,
77 .route = nf_br_route,
78 - .saveroute = nf_br_saveroute,
79 .reroute = nf_br_reroute,
80 .route_key_size = 0,
81 };
82 --- a/net/ipv4/netfilter.c
83 +++ b/net/ipv4/netfilter.c
84 @@ -80,33 +80,6 @@ int ip_route_me_harder(struct net *net,
85 }
86 EXPORT_SYMBOL(ip_route_me_harder);
87
88 -/*
89 - * Extra routing may needed on local out, as the QUEUE target never
90 - * returns control to the table.
91 - */
92 -
93 -struct ip_rt_info {
94 - __be32 daddr;
95 - __be32 saddr;
96 - u_int8_t tos;
97 - u_int32_t mark;
98 -};
99 -
100 -static void nf_ip_saveroute(const struct sk_buff *skb,
101 - struct nf_queue_entry *entry)
102 -{
103 - struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
104 -
105 - if (entry->state.hook == NF_INET_LOCAL_OUT) {
106 - const struct iphdr *iph = ip_hdr(skb);
107 -
108 - rt_info->tos = iph->tos;
109 - rt_info->daddr = iph->daddr;
110 - rt_info->saddr = iph->saddr;
111 - rt_info->mark = skb->mark;
112 - }
113 -}
114 -
115 static int nf_ip_reroute(struct net *net, struct sk_buff *skb,
116 const struct nf_queue_entry *entry)
117 {
118 @@ -190,7 +163,6 @@ static int nf_ip_route(struct net *net,
119 static const struct nf_afinfo nf_ip_afinfo = {
120 .family = AF_INET,
121 .route = nf_ip_route,
122 - .saveroute = nf_ip_saveroute,
123 .reroute = nf_ip_reroute,
124 .route_key_size = sizeof(struct ip_rt_info),
125 };
126 --- a/net/ipv6/netfilter.c
127 +++ b/net/ipv6/netfilter.c
128 @@ -72,31 +72,6 @@ int ip6_route_me_harder(struct net *net,
129 }
130 EXPORT_SYMBOL(ip6_route_me_harder);
131
132 -/*
133 - * Extra routing may needed on local out, as the QUEUE target never
134 - * returns control to the table.
135 - */
136 -
137 -struct ip6_rt_info {
138 - struct in6_addr daddr;
139 - struct in6_addr saddr;
140 - u_int32_t mark;
141 -};
142 -
143 -static void nf_ip6_saveroute(const struct sk_buff *skb,
144 - struct nf_queue_entry *entry)
145 -{
146 - struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
147 -
148 - if (entry->state.hook == NF_INET_LOCAL_OUT) {
149 - const struct ipv6hdr *iph = ipv6_hdr(skb);
150 -
151 - rt_info->daddr = iph->daddr;
152 - rt_info->saddr = iph->saddr;
153 - rt_info->mark = skb->mark;
154 - }
155 -}
156 -
157 static int nf_ip6_reroute(struct net *net, struct sk_buff *skb,
158 const struct nf_queue_entry *entry)
159 {
160 @@ -204,7 +179,6 @@ static const struct nf_ipv6_ops ipv6ops
161 static const struct nf_afinfo nf_ip6_afinfo = {
162 .family = AF_INET6,
163 .route = nf_ip6_route,
164 - .saveroute = nf_ip6_saveroute,
165 .reroute = nf_ip6_reroute,
166 .route_key_size = sizeof(struct ip6_rt_info),
167 };
168 --- a/net/netfilter/nf_queue.c
169 +++ b/net/netfilter/nf_queue.c
170 @@ -10,6 +10,8 @@
171 #include <linux/proc_fs.h>
172 #include <linux/skbuff.h>
173 #include <linux/netfilter.h>
174 +#include <linux/netfilter_ipv4.h>
175 +#include <linux/netfilter_ipv6.h>
176 #include <linux/netfilter_bridge.h>
177 #include <linux/seq_file.h>
178 #include <linux/rcupdate.h>
179 @@ -108,6 +110,35 @@ void nf_queue_nf_hook_drop(struct net *n
180 }
181 EXPORT_SYMBOL_GPL(nf_queue_nf_hook_drop);
182
183 +static void nf_ip_saveroute(const struct sk_buff *skb,
184 + struct nf_queue_entry *entry)
185 +{
186 + struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
187 +
188 + if (entry->state.hook == NF_INET_LOCAL_OUT) {
189 + const struct iphdr *iph = ip_hdr(skb);
190 +
191 + rt_info->tos = iph->tos;
192 + rt_info->daddr = iph->daddr;
193 + rt_info->saddr = iph->saddr;
194 + rt_info->mark = skb->mark;
195 + }
196 +}
197 +
198 +static void nf_ip6_saveroute(const struct sk_buff *skb,
199 + struct nf_queue_entry *entry)
200 +{
201 + struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
202 +
203 + if (entry->state.hook == NF_INET_LOCAL_OUT) {
204 + const struct ipv6hdr *iph = ipv6_hdr(skb);
205 +
206 + rt_info->daddr = iph->daddr;
207 + rt_info->saddr = iph->saddr;
208 + rt_info->mark = skb->mark;
209 + }
210 +}
211 +
212 static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
213 const struct nf_hook_entries *entries,
214 unsigned int index, unsigned int queuenum)
215 @@ -148,7 +179,16 @@ static int __nf_queue(struct sk_buff *sk
216 };
217
218 nf_queue_entry_get_refs(entry);
219 - afinfo->saveroute(skb, entry);
220 +
221 + switch (entry->state.pf) {
222 + case AF_INET:
223 + nf_ip_saveroute(skb, entry);
224 + break;
225 + case AF_INET6:
226 + nf_ip6_saveroute(skb, entry);
227 + break;
228 + }
229 +
230 status = qh->outfn(entry, queuenum);
231
232 if (status < 0) {
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