1 .\" $KAME: ipsec_set_policy.3,v 1.15 2001/08/17 07:21:36 itojun Exp $
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31 .Dt IPSEC_SET_POLICY 3
34 .Nm ipsec_set_policy ,
35 .Nm ipsec_get_policylen ,
37 .Nd manipulate IPsec policy specification structure from readable string
42 .Fd #include <netinet6/ipsec.h>
44 .Fn ipsec_set_policy "char *policy" "int len"
46 .Fn ipsec_get_policylen "char *buf"
48 .Fn ipsec_dump_policy "char *buf" "char *delim"
51 generates IPsec policy specification structure, namely
52 .Li struct sadb_x_policy
54 .Li struct sadb_x_ipsecrequest
55 from human-readable policy specification.
56 policy specification must be given as C string
63 will return the buffer of IPsec policy specification structure.
64 The buffer is dynamically allocated, and must be freed by the caller by calling
67 You may want the length of the generated buffer such when calling
69 .Fn ipsec_get_policylen
70 will return the length.
73 converts IPsec policy structure into readable form.
76 can be regarded as inverse conversion of
77 .Fn ipsec_set_policy .
79 points to a IPsec policy structure,
80 .Li struct sadb_x_policy .
82 is a delimiter string, which is usually a blank character.
87 single whitespace is assumed.
89 returns pointer to dynamically allocated string.
90 It is caller's responsibility to reclaim the region, by using
94 is formatted as either of the following:
95 .Bl -tag -width "discard"
96 .It Ar direction Li discard
103 specifies which direction the policy needs to be applied.
106 policy, packets will be dropped if they match the policy.
107 .It Ar direction Li entrust
109 means to consult to SPD defined by
111 .It Ar direction Li bypass
113 means to be bypassed the IPsec processing.
114 .Pq packet will be transmitted in clear .
115 This is for privileged socket.
122 means that the matching packets are subject to IPsec processing.
124 can be followed by one or more
126 string, which is formatted as below:
127 .Bl -tag -width "discard"
154 specifies IPsec endpoint.
183 must be set to one of the following:
184 .Li default , use , require
188 means that the kernel should consult the system default policy
192 .Li net.inet.ipsec.esp_trans_deflev .
195 regarding the system default.
197 means that a relevant SA can be used when available,
198 since the kernel may perform IPsec operation against packets when possible.
199 In this case, packets can be transmitted in clear
200 .Pq when SA is not available ,
202 .Pq when SA is available .
204 means that a relevant SA is required,
205 since the kernel must perform IPsec operation against packets.
209 but adds the restriction that the SA for outbound traffic is used
210 only for this policy.
211 You may need the identifier in order to relate the policy and the SA
212 when you define the SA by manual keying.
213 You can put the decimal number as the identifier after
216 .Li unique : number .
218 must be between 1 and 32767 .
221 string is kept unambiguous,
226 However, it is encouraged to specify them explicitly
227 to avoid unintended behaviors.
230 is omitted, it will be interpreted as
235 Note that there is a bit difference of specification from
239 both entrust and bypass are not used.
244 Here are several examples
245 .Pq long lines are wrapped for readability :
246 .Bd -literal -offset indent
248 out ipsec esp/transport//require
249 in ipsec ah/transport//require
250 out ipsec esp/tunnel/10.1.1.2-10.1.1.1/use
251 in ipsec ipcomp/transport//use
256 returns a pointer to the allocated buffer of policy specification if successful; otherwise a NULL pointer is returned.
257 .Fn ipsec_get_policylen
258 returns with positive value
259 .Pq meaning the buffer size
260 on success, and negative value on errors.
261 .Fn ipsec_dump_policy
262 returns a pointer to dynamically allocated region on success,
267 .Xr ipsec_strerror 3 ,
271 The functions first appeared in WIDE/KAME IPv6 protocol stack kit.