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Linux/net/xfrm/xfrm_output.c

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  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 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 static int xfrm_output_one(struct sk_buff *skb, int err)
 42 {
 43         struct dst_entry *dst = skb_dst(skb);
 44         struct xfrm_state *x = dst->xfrm;
 45         struct net *net = xs_net(x);
 46 
 47         if (err <= 0)
 48                 goto resume;
 49 
 50         do {
 51                 err = xfrm_skb_check_space(skb);
 52                 if (err) {
 53                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
 54                         goto error_nolock;
 55                 }
 56 
 57                 err = x->outer_mode->output(x, skb);
 58                 if (err) {
 59                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
 60                         goto error_nolock;
 61                 }
 62 
 63                 spin_lock_bh(&x->lock);
 64 
 65                 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
 66                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID);
 67                         err = -EINVAL;
 68                         goto error;
 69                 }
 70 
 71                 err = xfrm_state_check_expire(x);
 72                 if (err) {
 73                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED);
 74                         goto error;
 75                 }
 76 
 77                 err = x->repl->overflow(x, skb);
 78                 if (err) {
 79                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR);
 80                         goto error;
 81                 }
 82 
 83                 x->curlft.bytes += skb->len;
 84                 x->curlft.packets++;
 85 
 86                 spin_unlock_bh(&x->lock);
 87 
 88                 skb_dst_force(skb);
 89 
 90                 err = x->type->output(x, skb);
 91                 if (err == -EINPROGRESS)
 92                         goto out;
 93 
 94 resume:
 95                 if (err) {
 96                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
 97                         goto error_nolock;
 98                 }
 99 
100                 dst = skb_dst_pop(skb);
101                 if (!dst) {
102                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
103                         err = -EHOSTUNREACH;
104                         goto error_nolock;
105                 }
106                 skb_dst_set(skb, dst);
107                 x = dst->xfrm;
108         } while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL));
109 
110         return 0;
111 
112 error:
113         spin_unlock_bh(&x->lock);
114 error_nolock:
115         kfree_skb(skb);
116 out:
117         return err;
118 }
119 
120 int xfrm_output_resume(struct sk_buff *skb, int err)
121 {
122         while (likely((err = xfrm_output_one(skb, err)) == 0)) {
123                 nf_reset(skb);
124 
125                 err = skb_dst(skb)->ops->local_out(skb);
126                 if (unlikely(err != 1))
127                         goto out;
128 
129                 if (!skb_dst(skb)->xfrm)
130                         return dst_output(skb);
131 
132                 err = nf_hook(skb_dst(skb)->ops->family,
133                               NF_INET_POST_ROUTING, skb,
134                               NULL, skb_dst(skb)->dev, xfrm_output2);
135                 if (unlikely(err != 1))
136                         goto out;
137         }
138 
139         if (err == -EINPROGRESS)
140                 err = 0;
141 
142 out:
143         return err;
144 }
145 EXPORT_SYMBOL_GPL(xfrm_output_resume);
146 
147 static int xfrm_output2(struct sk_buff *skb)
148 {
149         return xfrm_output_resume(skb, 1);
150 }
151 
152 static int xfrm_output_gso(struct sk_buff *skb)
153 {
154         struct sk_buff *segs;
155 
156         segs = skb_gso_segment(skb, 0);
157         kfree_skb(skb);
158         if (IS_ERR(segs))
159                 return PTR_ERR(segs);
160         if (segs == NULL)
161                 return -EINVAL;
162 
163         do {
164                 struct sk_buff *nskb = segs->next;
165                 int err;
166 
167                 segs->next = NULL;
168                 err = xfrm_output2(segs);
169 
170                 if (unlikely(err)) {
171                         kfree_skb_list(nskb);
172                         return err;
173                 }
174 
175                 segs = nskb;
176         } while (segs);
177 
178         return 0;
179 }
180 
181 int xfrm_output(struct sk_buff *skb)
182 {
183         struct net *net = dev_net(skb_dst(skb)->dev);
184         int err;
185 
186         if (skb_is_gso(skb))
187                 return xfrm_output_gso(skb);
188 
189         if (skb->ip_summed == CHECKSUM_PARTIAL) {
190                 err = skb_checksum_help(skb);
191                 if (err) {
192                         XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
193                         kfree_skb(skb);
194                         return err;
195                 }
196         }
197 
198         return xfrm_output2(skb);
199 }
200 EXPORT_SYMBOL_GPL(xfrm_output);
201 
202 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb)
203 {
204         struct xfrm_mode *inner_mode;
205         if (x->sel.family == AF_UNSPEC)
206                 inner_mode = xfrm_ip2inner_mode(x,
207                                 xfrm_af2proto(skb_dst(skb)->ops->family));
208         else
209                 inner_mode = x->inner_mode;
210 
211         if (inner_mode == NULL)
212                 return -EAFNOSUPPORT;
213         return inner_mode->afinfo->extract_output(x, skb);
214 }
215 EXPORT_SYMBOL_GPL(xfrm_inner_extract_output);
216 
217 void xfrm_local_error(struct sk_buff *skb, int mtu)
218 {
219         unsigned int proto;
220         struct xfrm_state_afinfo *afinfo;
221 
222         if (skb->protocol == htons(ETH_P_IP))
223                 proto = AF_INET;
224         else if (skb->protocol == htons(ETH_P_IPV6))
225                 proto = AF_INET6;
226         else
227                 return;
228 
229         afinfo = xfrm_state_get_afinfo(proto);
230         if (!afinfo)
231                 return;
232 
233         afinfo->local_error(skb, mtu);
234         xfrm_state_put_afinfo(afinfo);
235 }
236 EXPORT_SYMBOL_GPL(xfrm_local_error);
237 

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