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Linux/net/ipv6/ila/ila_lwt.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 #include <linux/errno.h>
  2 #include <linux/ip.h>
  3 #include <linux/kernel.h>
  4 #include <linux/module.h>
  5 #include <linux/skbuff.h>
  6 #include <linux/socket.h>
  7 #include <linux/types.h>
  8 #include <net/checksum.h>
  9 #include <net/dst_cache.h>
 10 #include <net/ip.h>
 11 #include <net/ip6_fib.h>
 12 #include <net/ip6_route.h>
 13 #include <net/lwtunnel.h>
 14 #include <net/protocol.h>
 15 #include <uapi/linux/ila.h>
 16 #include "ila.h"
 17 
 18 struct ila_lwt {
 19         struct ila_params p;
 20         struct dst_cache dst_cache;
 21         u32 connected : 1;
 22 };
 23 
 24 static inline struct ila_lwt *ila_lwt_lwtunnel(
 25         struct lwtunnel_state *lwt)
 26 {
 27         return (struct ila_lwt *)lwt->data;
 28 }
 29 
 30 static inline struct ila_params *ila_params_lwtunnel(
 31         struct lwtunnel_state *lwt)
 32 {
 33         return &ila_lwt_lwtunnel(lwt)->p;
 34 }
 35 
 36 static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 37 {
 38         struct dst_entry *orig_dst = skb_dst(skb);
 39         struct rt6_info *rt = (struct rt6_info *)orig_dst;
 40         struct ila_lwt *ilwt = ila_lwt_lwtunnel(orig_dst->lwtstate);
 41         struct dst_entry *dst;
 42         int err = -EINVAL;
 43 
 44         if (skb->protocol != htons(ETH_P_IPV6))
 45                 goto drop;
 46 
 47         ila_update_ipv6_locator(skb, ila_params_lwtunnel(orig_dst->lwtstate),
 48                                 true);
 49 
 50         if (rt->rt6i_flags & (RTF_GATEWAY | RTF_CACHE)) {
 51                 /* Already have a next hop address in route, no need for
 52                  * dest cache route.
 53                  */
 54                 return orig_dst->lwtstate->orig_output(net, sk, skb);
 55         }
 56 
 57         dst = dst_cache_get(&ilwt->dst_cache);
 58         if (unlikely(!dst)) {
 59                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 60                 struct flowi6 fl6;
 61 
 62                 /* Lookup a route for the new destination. Take into
 63                  * account that the base route may already have a gateway.
 64                  */
 65 
 66                 memset(&fl6, 0, sizeof(fl6));
 67                 fl6.flowi6_oif = orig_dst->dev->ifindex;
 68                 fl6.flowi6_iif = LOOPBACK_IFINDEX;
 69                 fl6.daddr = *rt6_nexthop((struct rt6_info *)orig_dst,
 70                                          &ip6h->daddr);
 71 
 72                 dst = ip6_route_output(net, NULL, &fl6);
 73                 if (dst->error) {
 74                         err = -EHOSTUNREACH;
 75                         dst_release(dst);
 76                         goto drop;
 77                 }
 78 
 79                 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
 80                 if (IS_ERR(dst)) {
 81                         err = PTR_ERR(dst);
 82                         goto drop;
 83                 }
 84 
 85                 if (ilwt->connected)
 86                         dst_cache_set_ip6(&ilwt->dst_cache, dst, &fl6.saddr);
 87         }
 88 
 89         skb_dst_set(skb, dst);
 90         return dst_output(net, sk, skb);
 91 
 92 drop:
 93         kfree_skb(skb);
 94         return -EINVAL;
 95 }
 96 
 97 static int ila_input(struct sk_buff *skb)
 98 {
 99         struct dst_entry *dst = skb_dst(skb);
100 
101         if (skb->protocol != htons(ETH_P_IPV6))
102                 goto drop;
103 
104         ila_update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate), false);
105 
106         return dst->lwtstate->orig_input(skb);
107 
108 drop:
109         kfree_skb(skb);
110         return -EINVAL;
111 }
112 
113 static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
114         [ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
115         [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
116 };
117 
118 static int ila_build_state(struct nlattr *nla,
119                            unsigned int family, const void *cfg,
120                            struct lwtunnel_state **ts)
121 {
122         struct ila_lwt *ilwt;
123         struct ila_params *p;
124         struct nlattr *tb[ILA_ATTR_MAX + 1];
125         struct lwtunnel_state *newts;
126         const struct fib6_config *cfg6 = cfg;
127         struct ila_addr *iaddr;
128         int ret;
129 
130         if (family != AF_INET6)
131                 return -EINVAL;
132 
133         if (cfg6->fc_dst_len < 8 * sizeof(struct ila_locator) + 3) {
134                 /* Need to have full locator and at least type field
135                  * included in destination
136                  */
137                 return -EINVAL;
138         }
139 
140         iaddr = (struct ila_addr *)&cfg6->fc_dst;
141 
142         if (!ila_addr_is_ila(iaddr) || ila_csum_neutral_set(iaddr->ident)) {
143                 /* Don't allow translation for a non-ILA address or checksum
144                  * neutral flag to be set.
145                  */
146                 return -EINVAL;
147         }
148 
149         ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla, ila_nl_policy, NULL);
150         if (ret < 0)
151                 return ret;
152 
153         if (!tb[ILA_ATTR_LOCATOR])
154                 return -EINVAL;
155 
156         newts = lwtunnel_state_alloc(sizeof(*ilwt));
157         if (!newts)
158                 return -ENOMEM;
159 
160         ilwt = ila_lwt_lwtunnel(newts);
161         ret = dst_cache_init(&ilwt->dst_cache, GFP_ATOMIC);
162         if (ret) {
163                 kfree(newts);
164                 return ret;
165         }
166 
167         p = ila_params_lwtunnel(newts);
168 
169         p->locator.v64 = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
170 
171         /* Precompute checksum difference for translation since we
172          * know both the old locator and the new one.
173          */
174         p->locator_match = iaddr->loc;
175         p->csum_diff = compute_csum_diff8(
176                 (__be32 *)&p->locator_match, (__be32 *)&p->locator);
177 
178         if (tb[ILA_ATTR_CSUM_MODE])
179                 p->csum_mode = nla_get_u8(tb[ILA_ATTR_CSUM_MODE]);
180 
181         ila_init_saved_csum(p);
182 
183         newts->type = LWTUNNEL_ENCAP_ILA;
184         newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
185                         LWTUNNEL_STATE_INPUT_REDIRECT;
186 
187         if (cfg6->fc_dst_len == 8 * sizeof(struct in6_addr))
188                 ilwt->connected = 1;
189 
190         *ts = newts;
191 
192         return 0;
193 }
194 
195 static void ila_destroy_state(struct lwtunnel_state *lwt)
196 {
197         dst_cache_destroy(&ila_lwt_lwtunnel(lwt)->dst_cache);
198 }
199 
200 static int ila_fill_encap_info(struct sk_buff *skb,
201                                struct lwtunnel_state *lwtstate)
202 {
203         struct ila_params *p = ila_params_lwtunnel(lwtstate);
204 
205         if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64,
206                               ILA_ATTR_PAD))
207                 goto nla_put_failure;
208         if (nla_put_u8(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
209                 goto nla_put_failure;
210 
211         return 0;
212 
213 nla_put_failure:
214         return -EMSGSIZE;
215 }
216 
217 static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
218 {
219         return nla_total_size_64bit(sizeof(u64)) + /* ILA_ATTR_LOCATOR */
220                nla_total_size(sizeof(u8)) +        /* ILA_ATTR_CSUM_MODE */
221                0;
222 }
223 
224 static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
225 {
226         struct ila_params *a_p = ila_params_lwtunnel(a);
227         struct ila_params *b_p = ila_params_lwtunnel(b);
228 
229         return (a_p->locator.v64 != b_p->locator.v64);
230 }
231 
232 static const struct lwtunnel_encap_ops ila_encap_ops = {
233         .build_state = ila_build_state,
234         .destroy_state = ila_destroy_state,
235         .output = ila_output,
236         .input = ila_input,
237         .fill_encap = ila_fill_encap_info,
238         .get_encap_size = ila_encap_nlsize,
239         .cmp_encap = ila_encap_cmp,
240         .owner = THIS_MODULE,
241 };
242 
243 int ila_lwt_init(void)
244 {
245         return lwtunnel_encap_add_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
246 }
247 
248 void ila_lwt_fini(void)
249 {
250         lwtunnel_encap_del_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
251 }
252 

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