~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/xfrm/xfrm_output.c

Version: ~ [ linux-5.13-rc1 ] ~ [ linux-5.12.2 ] ~ [ linux-5.11.19 ] ~ [ linux-5.10.35 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.117 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.190 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.232 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.268 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.268 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * xfrm_output.c - Common IPsec encapsulation code.
  3  *
  4  * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/errno.h>
 13 #include <linux/module.h>
 14 #include <linux/netdevice.h>
 15 #include <linux/netfilter.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/slab.h>
 18 #include <linux/spinlock.h>
 19 #include <net/dst.h>
 20 #include <net/xfrm.h>
 21 
 22 static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb);
 23 
 24 static int xfrm_skb_check_space(struct sk_buff *skb)
 25 {
 26         struct dst_entry *dst = skb_dst(skb);
 27         int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev)
 28                 - skb_headroom(skb);
 29         int ntail = dst->dev->needed_tailroom - skb_tailroom(skb);
 30 
 31         if (nhead <= 0) {
 32                 if (ntail <= 0)
 33                         return 0;
 34                 nhead = 0;
 35         } else if (ntail < 0)
 36                 ntail = 0;
 37 
 38         return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC);
 39 }
 40 
 41 /* Children define the path of the packet through the
 42  * Linux networking.  Thus, destinations are stackable.
 43  */
 44 
 45 static struct dst_entry *skb_dst_pop(struct sk_buff *skb)
 46 {
 47         struct dst_entry *child = dst_clone(skb_dst(skb)->child);
 48 
 49         skb_dst_drop(skb);
 50         return child;
 51 }
 52 
 53 static int xfrm_output_one(struct sk_buff *skb, int err)
 54 {
 55         struct dst_entry *dst = skb_dst(skb);
 56         struct xfrm_state *x = dst->xfrm;
 57         struct net *net = xs_net(x);
 58 
 59         if (err <= 0)
 60                 goto resume;
 61 
 62         do {
 63                 err = xfrm_skb_check_space(skb);
 64                 if (err) {
 65                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
 66                         goto error_nolock;
 67                 }
 68 
 69                 err = x->outer_mode->output(x, skb);
 70                 if (err) {
 71                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
 72                         goto error_nolock;
 73                 }
 74 
 75                 spin_lock_bh(&x->lock);
 76 
 77                 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
 78                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID);
 79                         err = -EINVAL;
 80                         goto error;
 81                 }
 82 
 83                 err = xfrm_state_check_expire(x);
 84                 if (err) {
 85                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED);
 86                         goto error;
 87                 }
 88 
 89                 err = x->repl->overflow(x, skb);
 90                 if (err) {
 91                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR);
 92                         goto error;
 93                 }
 94 
 95                 x->curlft.bytes += skb->len;
 96                 x->curlft.packets++;
 97 
 98                 spin_unlock_bh(&x->lock);
 99 
100                 skb_dst_force(skb);
101 
102                 if (xfrm_offload(skb)) {
103                         x->type_offload->encap(x, skb);
104                 } else {
105                         err = x->type->output(x, skb);
106                         if (err == -EINPROGRESS)
107                                 goto out;
108                 }
109 
110 resume:
111                 if (err) {
112                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
113                         goto error_nolock;
114                 }
115 
116                 dst = skb_dst_pop(skb);
117                 if (!dst) {
118                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
119                         err = -EHOSTUNREACH;
120                         goto error_nolock;
121                 }
122                 skb_dst_set(skb, dst);
123                 x = dst->xfrm;
124         } while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL));
125 
126         return 0;
127 
128 error:
129         spin_unlock_bh(&x->lock);
130 error_nolock:
131         kfree_skb(skb);
132 out:
133         return err;
134 }
135 
136 int xfrm_output_resume(struct sk_buff *skb, int err)
137 {
138         struct net *net = xs_net(skb_dst(skb)->xfrm);
139 
140         while (likely((err = xfrm_output_one(skb, err)) == 0)) {
141                 nf_reset(skb);
142 
143                 err = skb_dst(skb)->ops->local_out(net, skb->sk, skb);
144                 if (unlikely(err != 1))
145                         goto out;
146 
147                 if (!skb_dst(skb)->xfrm)
148                         return dst_output(net, skb->sk, skb);
149 
150                 err = nf_hook(skb_dst(skb)->ops->family,
151                               NF_INET_POST_ROUTING, net, skb->sk, skb,
152                               NULL, skb_dst(skb)->dev, xfrm_output2);
153                 if (unlikely(err != 1))
154                         goto out;
155         }
156 
157         if (err == -EINPROGRESS)
158                 err = 0;
159 
160 out:
161         return err;
162 }
163 EXPORT_SYMBOL_GPL(xfrm_output_resume);
164 
165 static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
166 {
167         return xfrm_output_resume(skb, 1);
168 }
169 
170 static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb)
171 {
172         struct sk_buff *segs;
173 
174         BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_SGO_CB_OFFSET);
175         BUILD_BUG_ON(sizeof(*IP6CB(skb)) > SKB_SGO_CB_OFFSET);
176         segs = skb_gso_segment(skb, 0);
177         kfree_skb(skb);
178         if (IS_ERR(segs))
179                 return PTR_ERR(segs);
180         if (segs == NULL)
181                 return -EINVAL;
182 
183         do {
184                 struct sk_buff *nskb = segs->next;
185                 int err;
186 
187                 segs->next = NULL;
188                 err = xfrm_output2(net, sk, segs);
189 
190                 if (unlikely(err)) {
191                         kfree_skb_list(nskb);
192                         return err;
193                 }
194 
195                 segs = nskb;
196         } while (segs);
197 
198         return 0;
199 }
200 
201 int xfrm_output(struct sock *sk, struct sk_buff *skb)
202 {
203         struct net *net = dev_net(skb_dst(skb)->dev);
204         struct xfrm_state *x = skb_dst(skb)->xfrm;
205         int err;
206 
207         secpath_reset(skb);
208         skb->encapsulation = 0;
209 
210         if (xfrm_dev_offload_ok(skb, x)) {
211                 struct sec_path *sp;
212 
213                 sp = secpath_dup(skb->sp);
214                 if (!sp) {
215                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
216                         kfree_skb(skb);
217                         return -ENOMEM;
218                 }
219                 if (skb->sp)
220                         secpath_put(skb->sp);
221                 skb->sp = sp;
222                 skb->encapsulation = 1;
223 
224                 sp->olen++;
225                 sp->xvec[skb->sp->len++] = x;
226                 xfrm_state_hold(x);
227 
228                 if (skb_is_gso(skb)) {
229                         skb_shinfo(skb)->gso_type |= SKB_GSO_ESP;
230 
231                         return xfrm_output2(net, sk, skb);
232                 }
233 
234                 if (x->xso.dev && x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM)
235                         goto out;
236         }
237 
238         if (skb_is_gso(skb))
239                 return xfrm_output_gso(net, sk, skb);
240 
241         if (skb->ip_summed == CHECKSUM_PARTIAL) {
242                 err = skb_checksum_help(skb);
243                 if (err) {
244                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
245                         kfree_skb(skb);
246                         return err;
247                 }
248         }
249 
250 out:
251         return xfrm_output2(net, sk, skb);
252 }
253 EXPORT_SYMBOL_GPL(xfrm_output);
254 
255 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb)
256 {
257         struct xfrm_mode *inner_mode;
258         if (x->sel.family == AF_UNSPEC)
259                 inner_mode = xfrm_ip2inner_mode(x,
260                                 xfrm_af2proto(skb_dst(skb)->ops->family));
261         else
262                 inner_mode = x->inner_mode;
263 
264         if (inner_mode == NULL)
265                 return -EAFNOSUPPORT;
266         return inner_mode->afinfo->extract_output(x, skb);
267 }
268 EXPORT_SYMBOL_GPL(xfrm_inner_extract_output);
269 
270 void xfrm_local_error(struct sk_buff *skb, int mtu)
271 {
272         unsigned int proto;
273         struct xfrm_state_afinfo *afinfo;
274 
275         if (skb->protocol == htons(ETH_P_IP))
276                 proto = AF_INET;
277         else if (skb->protocol == htons(ETH_P_IPV6))
278                 proto = AF_INET6;
279         else
280                 return;
281 
282         afinfo = xfrm_state_get_afinfo(proto);
283         if (afinfo)
284                 afinfo->local_error(skb, mtu);
285         rcu_read_unlock();
286 }
287 EXPORT_SYMBOL_GPL(xfrm_local_error);
288 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp