1
2#include <linux/errno.h>
3#include <linux/ip.h>
4#include <linux/kernel.h>
5#include <linux/module.h>
6#include <linux/skbuff.h>
7#include <linux/socket.h>
8#include <linux/types.h>
9#include <net/checksum.h>
10#include <net/dst_cache.h>
11#include <net/ip.h>
12#include <net/ip6_fib.h>
13#include <net/ip6_route.h>
14#include <net/lwtunnel.h>
15#include <net/protocol.h>
16#include <uapi/linux/ila.h>
17#include "ila.h"
18
19struct ila_lwt {
20 struct ila_params p;
21 struct dst_cache dst_cache;
22 u32 connected : 1;
23 u32 lwt_output : 1;
24};
25
26static inline struct ila_lwt *ila_lwt_lwtunnel(
27 struct lwtunnel_state *lwt)
28{
29 return (struct ila_lwt *)lwt->data;
30}
31
32static inline struct ila_params *ila_params_lwtunnel(
33 struct lwtunnel_state *lwt)
34{
35 return &ila_lwt_lwtunnel(lwt)->p;
36}
37
38static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
39{
40 struct dst_entry *orig_dst = skb_dst(skb);
41 struct rt6_info *rt = (struct rt6_info *)orig_dst;
42 struct ila_lwt *ilwt = ila_lwt_lwtunnel(orig_dst->lwtstate);
43 struct dst_entry *dst;
44 int err = -EINVAL;
45
46 if (skb->protocol != htons(ETH_P_IPV6))
47 goto drop;
48
49 if (ilwt->lwt_output)
50 ila_update_ipv6_locator(skb,
51 ila_params_lwtunnel(orig_dst->lwtstate),
52 true);
53
54 if (rt->rt6i_flags & (RTF_GATEWAY | RTF_CACHE)) {
55
56
57
58 return orig_dst->lwtstate->orig_output(net, sk, skb);
59 }
60
61 dst = dst_cache_get(&ilwt->dst_cache);
62 if (unlikely(!dst)) {
63 struct ipv6hdr *ip6h = ipv6_hdr(skb);
64 struct flowi6 fl6;
65
66
67
68
69
70 memset(&fl6, 0, sizeof(fl6));
71 fl6.flowi6_oif = orig_dst->dev->ifindex;
72 fl6.flowi6_iif = LOOPBACK_IFINDEX;
73 fl6.daddr = *rt6_nexthop((struct rt6_info *)orig_dst,
74 &ip6h->daddr);
75
76 dst = ip6_route_output(net, NULL, &fl6);
77 if (dst->error) {
78 err = -EHOSTUNREACH;
79 dst_release(dst);
80 goto drop;
81 }
82
83 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
84 if (IS_ERR(dst)) {
85 err = PTR_ERR(dst);
86 goto drop;
87 }
88
89 if (ilwt->connected)
90 dst_cache_set_ip6(&ilwt->dst_cache, dst, &fl6.saddr);
91 }
92
93 skb_dst_set(skb, dst);
94 return dst_output(net, sk, skb);
95
96drop:
97 kfree_skb(skb);
98 return err;
99}
100
101static int ila_input(struct sk_buff *skb)
102{
103 struct dst_entry *dst = skb_dst(skb);
104 struct ila_lwt *ilwt = ila_lwt_lwtunnel(dst->lwtstate);
105
106 if (skb->protocol != htons(ETH_P_IPV6))
107 goto drop;
108
109 if (!ilwt->lwt_output)
110 ila_update_ipv6_locator(skb,
111 ila_params_lwtunnel(dst->lwtstate),
112 false);
113
114 return dst->lwtstate->orig_input(skb);
115
116drop:
117 kfree_skb(skb);
118 return -EINVAL;
119}
120
121static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
122 [ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
123 [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
124 [ILA_ATTR_IDENT_TYPE] = { .type = NLA_U8, },
125 [ILA_ATTR_HOOK_TYPE] = { .type = NLA_U8, },
126};
127
128static int ila_build_state(struct nlattr *nla,
129 unsigned int family, const void *cfg,
130 struct lwtunnel_state **ts,
131 struct netlink_ext_ack *extack)
132{
133 struct ila_lwt *ilwt;
134 struct ila_params *p;
135 struct nlattr *tb[ILA_ATTR_MAX + 1];
136 struct lwtunnel_state *newts;
137 const struct fib6_config *cfg6 = cfg;
138 struct ila_addr *iaddr;
139 u8 ident_type = ILA_ATYPE_USE_FORMAT;
140 u8 hook_type = ILA_HOOK_ROUTE_OUTPUT;
141 u8 csum_mode = ILA_CSUM_NO_ACTION;
142 bool lwt_output = true;
143 u8 eff_ident_type;
144 int ret;
145
146 if (family != AF_INET6)
147 return -EINVAL;
148
149 ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla, ila_nl_policy, extack);
150 if (ret < 0)
151 return ret;
152
153 if (!tb[ILA_ATTR_LOCATOR])
154 return -EINVAL;
155
156 iaddr = (struct ila_addr *)&cfg6->fc_dst;
157
158 if (tb[ILA_ATTR_IDENT_TYPE])
159 ident_type = nla_get_u8(tb[ILA_ATTR_IDENT_TYPE]);
160
161 if (ident_type == ILA_ATYPE_USE_FORMAT) {
162
163
164
165
166 if (cfg6->fc_dst_len < 8 * sizeof(struct ila_locator) + 3) {
167
168
169
170 return -EINVAL;
171 }
172
173 eff_ident_type = iaddr->ident.type;
174 } else {
175 eff_ident_type = ident_type;
176 }
177
178 switch (eff_ident_type) {
179 case ILA_ATYPE_IID:
180
181 return -EINVAL;
182 case ILA_ATYPE_LUID:
183 break;
184 case ILA_ATYPE_VIRT_V4:
185 case ILA_ATYPE_VIRT_UNI_V6:
186 case ILA_ATYPE_VIRT_MULTI_V6:
187 case ILA_ATYPE_NONLOCAL_ADDR:
188
189 default:
190 return -EINVAL;
191 }
192
193 if (tb[ILA_ATTR_HOOK_TYPE])
194 hook_type = nla_get_u8(tb[ILA_ATTR_HOOK_TYPE]);
195
196 switch (hook_type) {
197 case ILA_HOOK_ROUTE_OUTPUT:
198 lwt_output = true;
199 break;
200 case ILA_HOOK_ROUTE_INPUT:
201 lwt_output = false;
202 break;
203 default:
204 return -EINVAL;
205 }
206
207 if (tb[ILA_ATTR_CSUM_MODE])
208 csum_mode = nla_get_u8(tb[ILA_ATTR_CSUM_MODE]);
209
210 if (csum_mode == ILA_CSUM_NEUTRAL_MAP &&
211 ila_csum_neutral_set(iaddr->ident)) {
212
213
214
215 return -EINVAL;
216 }
217
218 newts = lwtunnel_state_alloc(sizeof(*ilwt));
219 if (!newts)
220 return -ENOMEM;
221
222 ilwt = ila_lwt_lwtunnel(newts);
223 ret = dst_cache_init(&ilwt->dst_cache, GFP_ATOMIC);
224 if (ret) {
225 kfree(newts);
226 return ret;
227 }
228
229 ilwt->lwt_output = !!lwt_output;
230
231 p = ila_params_lwtunnel(newts);
232
233 p->csum_mode = csum_mode;
234 p->ident_type = ident_type;
235 p->locator.v64 = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
236
237
238
239
240 p->locator_match = iaddr->loc;
241
242 ila_init_saved_csum(p);
243
244 newts->type = LWTUNNEL_ENCAP_ILA;
245 newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
246 LWTUNNEL_STATE_INPUT_REDIRECT;
247
248 if (cfg6->fc_dst_len == 8 * sizeof(struct in6_addr))
249 ilwt->connected = 1;
250
251 *ts = newts;
252
253 return 0;
254}
255
256static void ila_destroy_state(struct lwtunnel_state *lwt)
257{
258 dst_cache_destroy(&ila_lwt_lwtunnel(lwt)->dst_cache);
259}
260
261static int ila_fill_encap_info(struct sk_buff *skb,
262 struct lwtunnel_state *lwtstate)
263{
264 struct ila_params *p = ila_params_lwtunnel(lwtstate);
265 struct ila_lwt *ilwt = ila_lwt_lwtunnel(lwtstate);
266
267 if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64,
268 ILA_ATTR_PAD))
269 goto nla_put_failure;
270
271 if (nla_put_u8(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
272 goto nla_put_failure;
273
274 if (nla_put_u8(skb, ILA_ATTR_IDENT_TYPE, (__force u8)p->ident_type))
275 goto nla_put_failure;
276
277 if (nla_put_u8(skb, ILA_ATTR_HOOK_TYPE,
278 ilwt->lwt_output ? ILA_HOOK_ROUTE_OUTPUT :
279 ILA_HOOK_ROUTE_INPUT))
280 goto nla_put_failure;
281
282 return 0;
283
284nla_put_failure:
285 return -EMSGSIZE;
286}
287
288static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
289{
290 return nla_total_size_64bit(sizeof(u64)) +
291 nla_total_size(sizeof(u8)) +
292 nla_total_size(sizeof(u8)) +
293 nla_total_size(sizeof(u8)) +
294 0;
295}
296
297static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
298{
299 struct ila_params *a_p = ila_params_lwtunnel(a);
300 struct ila_params *b_p = ila_params_lwtunnel(b);
301
302 return (a_p->locator.v64 != b_p->locator.v64);
303}
304
305static const struct lwtunnel_encap_ops ila_encap_ops = {
306 .build_state = ila_build_state,
307 .destroy_state = ila_destroy_state,
308 .output = ila_output,
309 .input = ila_input,
310 .fill_encap = ila_fill_encap_info,
311 .get_encap_size = ila_encap_nlsize,
312 .cmp_encap = ila_encap_cmp,
313 .owner = THIS_MODULE,
314};
315
316int ila_lwt_init(void)
317{
318 return lwtunnel_encap_add_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
319}
320
321void ila_lwt_fini(void)
322{
323 lwtunnel_encap_del_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
324}
325
