sctp: Do not account for sizeof(struct sk_buff) in estimated rwnd
[linux-2.6.git] / net / ipv6 / xfrm6_state.c
1 /*
2  * xfrm6_state.c: based on xfrm4_state.c
3  *
4  * Authors:
5  *      Mitsuru KANDA @USAGI
6  *      Kazunori MIYAZAWA @USAGI
7  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8  *              IPv6 support
9  *      YOSHIFUJI Hideaki @USAGI
10  *              Split up af-specific portion
11  *
12  */
13
14 #include <net/xfrm.h>
15 #include <linux/pfkeyv2.h>
16 #include <linux/ipsec.h>
17 #include <linux/netfilter_ipv6.h>
18 #include <net/dsfield.h>
19 #include <net/ipv6.h>
20 #include <net/addrconf.h>
21
22 static void
23 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
24 {
25         const struct flowi6 *fl6 = &fl->u.ip6;
26
27         /* Initialize temporary selector matching only
28          * to current session. */
29         ipv6_addr_copy((struct in6_addr *)&sel->daddr, &fl6->daddr);
30         ipv6_addr_copy((struct in6_addr *)&sel->saddr, &fl6->saddr);
31         sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
32         sel->dport_mask = htons(0xffff);
33         sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
34         sel->sport_mask = htons(0xffff);
35         sel->family = AF_INET6;
36         sel->prefixlen_d = 128;
37         sel->prefixlen_s = 128;
38         sel->proto = fl6->flowi6_proto;
39         sel->ifindex = fl6->flowi6_oif;
40 }
41
42 static void
43 xfrm6_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
44                    const xfrm_address_t *daddr, const xfrm_address_t *saddr)
45 {
46         x->id = tmpl->id;
47         if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
48                 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
49         memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
50         if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
51                 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
52         x->props.mode = tmpl->mode;
53         x->props.reqid = tmpl->reqid;
54         x->props.family = AF_INET6;
55 }
56
57 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
58 static int
59 __xfrm6_sort(void **dst, void **src, int n, int (*cmp)(void *p), int maxclass)
60 {
61         int i;
62         int class[XFRM_MAX_DEPTH];
63         int count[maxclass];
64
65         memset(count, 0, sizeof(count));
66
67         for (i = 0; i < n; i++) {
68                 int c;
69                 class[i] = c = cmp(src[i]);
70                 count[c]++;
71         }
72
73         for (i = 2; i < maxclass; i++)
74                 count[i] += count[i - 1];
75
76         for (i = 0; i < n; i++) {
77                 dst[count[class[i] - 1]++] = src[i];
78                 src[i] = NULL;
79         }
80
81         return 0;
82 }
83
84 /*
85  * Rule for xfrm_state:
86  *
87  * rule 1: select IPsec transport except AH
88  * rule 2: select MIPv6 RO or inbound trigger
89  * rule 3: select IPsec transport AH
90  * rule 4: select IPsec tunnel
91  * rule 5: others
92  */
93 static int __xfrm6_state_sort_cmp(void *p)
94 {
95         struct xfrm_state *v = p;
96
97         switch (v->props.mode) {
98         case XFRM_MODE_TRANSPORT:
99                 if (v->id.proto != IPPROTO_AH)
100                         return 1;
101                 else
102                         return 3;
103 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
104         case XFRM_MODE_ROUTEOPTIMIZATION:
105         case XFRM_MODE_IN_TRIGGER:
106                 return 2;
107 #endif
108         case XFRM_MODE_TUNNEL:
109         case XFRM_MODE_BEET:
110                 return 4;
111         }
112         return 5;
113 }
114
115 static int
116 __xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
117 {
118         return __xfrm6_sort((void **)dst, (void **)src, n,
119                             __xfrm6_state_sort_cmp, 6);
120 }
121
122 /*
123  * Rule for xfrm_tmpl:
124  *
125  * rule 1: select IPsec transport
126  * rule 2: select MIPv6 RO or inbound trigger
127  * rule 3: select IPsec tunnel
128  * rule 4: others
129  */
130 static int __xfrm6_tmpl_sort_cmp(void *p)
131 {
132         struct xfrm_tmpl *v = p;
133         switch (v->mode) {
134         case XFRM_MODE_TRANSPORT:
135                 return 1;
136 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
137         case XFRM_MODE_ROUTEOPTIMIZATION:
138         case XFRM_MODE_IN_TRIGGER:
139                 return 2;
140 #endif
141         case XFRM_MODE_TUNNEL:
142         case XFRM_MODE_BEET:
143                 return 3;
144         }
145         return 4;
146 }
147
148 static int
149 __xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
150 {
151         return __xfrm6_sort((void **)dst, (void **)src, n,
152                             __xfrm6_tmpl_sort_cmp, 5);
153 }
154
155 int xfrm6_extract_header(struct sk_buff *skb)
156 {
157         struct ipv6hdr *iph = ipv6_hdr(skb);
158
159         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
160         XFRM_MODE_SKB_CB(skb)->id = 0;
161         XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
162         XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
163         XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
164         XFRM_MODE_SKB_CB(skb)->optlen = 0;
165         memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
166                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
167
168         return 0;
169 }
170
171 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
172         .family                 = AF_INET6,
173         .proto                  = IPPROTO_IPV6,
174         .eth_proto              = htons(ETH_P_IPV6),
175         .owner                  = THIS_MODULE,
176         .init_tempsel           = __xfrm6_init_tempsel,
177         .init_temprop           = xfrm6_init_temprop,
178         .tmpl_sort              = __xfrm6_tmpl_sort,
179         .state_sort             = __xfrm6_state_sort,
180         .output                 = xfrm6_output,
181         .output_finish          = xfrm6_output_finish,
182         .extract_input          = xfrm6_extract_input,
183         .extract_output         = xfrm6_extract_output,
184         .transport_finish       = xfrm6_transport_finish,
185 };
186
187 int __init xfrm6_state_init(void)
188 {
189         return xfrm_state_register_afinfo(&xfrm6_state_afinfo);
190 }
191
192 void xfrm6_state_fini(void)
193 {
194         xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
195 }
196