2 * xfrm6_state.c: based on xfrm4_state.c
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * YOSHIFUJI Hideaki @USAGI
10 * Split up af-specific portion
15 #include <linux/pfkeyv2.h>
16 #include <linux/ipsec.h>
17 #include <linux/netfilter_ipv6.h>
18 #include <net/dsfield.h>
20 #include <net/addrconf.h>
23 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
25 /* Initialize temporary selector matching only
26 * to current session. */
27 ipv6_addr_copy((struct in6_addr *)&sel->daddr, &fl->fl6_dst);
28 ipv6_addr_copy((struct in6_addr *)&sel->saddr, &fl->fl6_src);
29 sel->dport = xfrm_flowi_dport(fl, &fl->u.ip6.uli);
30 sel->dport_mask = htons(0xffff);
31 sel->sport = xfrm_flowi_sport(fl, &fl->u.ip6.uli);
32 sel->sport_mask = htons(0xffff);
33 sel->family = AF_INET6;
34 sel->prefixlen_d = 128;
35 sel->prefixlen_s = 128;
36 sel->proto = fl->flowi_proto;
37 sel->ifindex = fl->flowi_oif;
41 xfrm6_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
42 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
45 if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
46 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
47 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
48 if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
49 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
50 x->props.mode = tmpl->mode;
51 x->props.reqid = tmpl->reqid;
52 x->props.family = AF_INET6;
55 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
57 __xfrm6_sort(void **dst, void **src, int n, int (*cmp)(void *p), int maxclass)
60 int class[XFRM_MAX_DEPTH];
63 memset(count, 0, sizeof(count));
65 for (i = 0; i < n; i++) {
67 class[i] = c = cmp(src[i]);
71 for (i = 2; i < maxclass; i++)
72 count[i] += count[i - 1];
74 for (i = 0; i < n; i++) {
75 dst[count[class[i] - 1]++] = src[i];
83 * Rule for xfrm_state:
85 * rule 1: select IPsec transport except AH
86 * rule 2: select MIPv6 RO or inbound trigger
87 * rule 3: select IPsec transport AH
88 * rule 4: select IPsec tunnel
91 static int __xfrm6_state_sort_cmp(void *p)
93 struct xfrm_state *v = p;
95 switch (v->props.mode) {
96 case XFRM_MODE_TRANSPORT:
97 if (v->id.proto != IPPROTO_AH)
101 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
102 case XFRM_MODE_ROUTEOPTIMIZATION:
103 case XFRM_MODE_IN_TRIGGER:
106 case XFRM_MODE_TUNNEL:
114 __xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
116 return __xfrm6_sort((void **)dst, (void **)src, n,
117 __xfrm6_state_sort_cmp, 6);
121 * Rule for xfrm_tmpl:
123 * rule 1: select IPsec transport
124 * rule 2: select MIPv6 RO or inbound trigger
125 * rule 3: select IPsec tunnel
128 static int __xfrm6_tmpl_sort_cmp(void *p)
130 struct xfrm_tmpl *v = p;
132 case XFRM_MODE_TRANSPORT:
134 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
135 case XFRM_MODE_ROUTEOPTIMIZATION:
136 case XFRM_MODE_IN_TRIGGER:
139 case XFRM_MODE_TUNNEL:
147 __xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
149 return __xfrm6_sort((void **)dst, (void **)src, n,
150 __xfrm6_tmpl_sort_cmp, 5);
153 int xfrm6_extract_header(struct sk_buff *skb)
155 struct ipv6hdr *iph = ipv6_hdr(skb);
157 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
158 XFRM_MODE_SKB_CB(skb)->id = 0;
159 XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
160 XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
161 XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
162 XFRM_MODE_SKB_CB(skb)->optlen = 0;
163 memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
164 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
169 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
171 .proto = IPPROTO_IPV6,
172 .eth_proto = htons(ETH_P_IPV6),
173 .owner = THIS_MODULE,
174 .init_tempsel = __xfrm6_init_tempsel,
175 .init_temprop = xfrm6_init_temprop,
176 .tmpl_sort = __xfrm6_tmpl_sort,
177 .state_sort = __xfrm6_state_sort,
178 .output = xfrm6_output,
179 .extract_input = xfrm6_extract_input,
180 .extract_output = xfrm6_extract_output,
181 .transport_finish = xfrm6_transport_finish,
184 int __init xfrm6_state_init(void)
186 return xfrm_state_register_afinfo(&xfrm6_state_afinfo);
189 void xfrm6_state_fini(void)
191 xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);