X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=secnet.git;a=blobdiff_plain;f=secnet.h;h=5e66a175348c9bf6ccc84969a4e1a1632bd1d0ec;hp=e7eb161d2ff0114e5edea55840cd1d1a9abb4583;hb=0118121ae6578c69527fb80a60294c48663033b7;hpb=42394c373c85942b55a9632c3182ec7c95731012

diff --git a/secnet.h b/secnet.h
index e7eb161..5e66a17 100644
--- a/secnet.h
+++ b/secnet.h
@@ -12,21 +12,6 @@
 #include <sys/time.h>
 #include <netinet/in.h>
 
-/*
- * Macros added by SGT for endianness-independence
- */
-#define GET_32BIT_MSB_FIRST(cp) \
-  (((unsigned long)(unsigned char)(cp)[0] << 24) | \
-  ((unsigned long)(unsigned char)(cp)[1] << 16) | \
-  ((unsigned long)(unsigned char)(cp)[2] << 8) | \
-  ((unsigned long)(unsigned char)(cp)[3]))
-
-#define PUT_32BIT_MSB_FIRST(cp, value) ( \
-  (cp)[0] = (char)((value) >> 24), \
-  (cp)[1] = (char)((value) >> 16), \
-  (cp)[2] = (char)((value) >> 8), \
-  (cp)[3] = (char)(value) )
-
 typedef char *string_t;
 typedef const char *cstring_t;
 typedef enum {False,True} bool_t;
@@ -184,13 +169,17 @@ extern void register_for_poll(void *st, beforepoll_fn *before,
 
 /* The secnet program goes through a number of phases in its lifetime.
    Module code may arrange to be called just as various phases are
-   entered. */
+   entered.
+ 
+   Remember to update the table in util.c if changing the set of
+   phases. */
 
 enum phase {
     PHASE_INIT,
     PHASE_GETOPTS,             /* Process command-line arguments */
     PHASE_READCONFIG,          /* Parse and process configuration file */
     PHASE_SETUP,               /* Process information in configuration */
+    PHASE_DAEMONIZE,           /* Become a daemon (if necessary) */
     PHASE_GETRESOURCES,        /* Obtain all external resources */
     PHASE_DROPPRIV,            /* Last chance for privileged operations */
     PHASE_RUN,
@@ -228,7 +217,7 @@ extern init_module random_module;
 extern init_module udp_module;
 extern init_module util_module;
 extern init_module site_module;
-extern init_module transform_module;
+extern init_module transform_cbcmac_module;
 extern init_module netlink_module;
 extern init_module rsa_module;
 extern init_module dh_module;
@@ -379,19 +368,28 @@ struct site_if {
    also depend on internal factors (eg. time) and keep internal
    state. A struct transform_if only represents a particular type of
    transformation; instances of the transformation (eg. with
-   particular key material) have a different C type. */
+   particular key material) have a different C type. The same
+   secret key will be used in opposite directions between a pair of
+   secnets; one of these pairs will get direction==False, the other True. */
 
 typedef struct transform_inst_if *transform_createinstance_fn(void *st);
-typedef bool_t transform_setkey_fn(void *st, uint8_t *key, int32_t keylen);
+typedef bool_t transform_setkey_fn(void *st, uint8_t *key, int32_t keylen,
+				   bool_t direction);
+typedef bool_t transform_valid_fn(void *st); /* 0: no key; 1: ok */
 typedef void transform_delkey_fn(void *st);
 typedef void transform_destroyinstance_fn(void *st);
-/* Returns 0 for 'all is well', any other value for a problem */
+/* Returns:
+ *   0: all is well
+ *   1: for any other problem
+ *   2: message decrypted but sequence number was out of range
+ */
 typedef uint32_t transform_apply_fn(void *st, struct buffer_if *buf,
 				    const char **errmsg);
 
 struct transform_inst_if {
     void *st;
     transform_setkey_fn *setkey;
+    transform_valid_fn *valid;
     transform_delkey_fn *delkey;
     transform_apply_fn *forwards;
     transform_apply_fn *reverse;
@@ -402,7 +400,7 @@ struct transform_if {
     void *st;
     int32_t max_start_pad; /* these three are all <<< INT_MAX */
     int32_t max_end_pad;
-    int32_t keylen;
+    int32_t keylen; /* 0 means give the transform exactly as much as there is */
     transform_createinstance_fn *create;
 };
 
@@ -416,10 +414,11 @@ struct transform_if {
 typedef void netlink_deliver_fn(void *st, struct buffer_if *buf);
 /* site code can tell netlink when outgoing packets will be dropped,
    so netlink can generate appropriate ICMP and make routing decisions */
-#define LINK_QUALITY_DOWN 0   /* No chance of a packet being delivered */
-#define LINK_QUALITY_DOWN_STALE_ADDRESS 1 /* Link down, old address information */
-#define LINK_QUALITY_DOWN_CURRENT_ADDRESS 2 /* Link down, current address information */
-#define LINK_QUALITY_UP 3     /* Link active */
+#define LINK_QUALITY_UNUSED 0   /* This link is unused, do not make this netlink */
+#define LINK_QUALITY_DOWN 1   /* No chance of a packet being delivered right away*/
+#define LINK_QUALITY_DOWN_STALE_ADDRESS 2 /* Link down, old address information */
+#define LINK_QUALITY_DOWN_CURRENT_ADDRESS 3 /* Link down, current address information */
+#define LINK_QUALITY_UP 4     /* Link active */
 #define MAXIMUM_LINK_QUALITY 3
 typedef void netlink_link_quality_fn(void *st, uint32_t quality);
 typedef void netlink_register_fn(void *st, netlink_deliver_fn *deliver,
@@ -433,8 +432,6 @@ struct netlink_if {
     netlink_register_fn *reg;
     netlink_deliver_fn *deliver;
     netlink_link_quality_fn *set_quality;
-    netlink_output_config_fn *output_config;
-    netlink_check_config_fn *check_config;
     netlink_set_mtu_fn *set_mtu;
 };
 
@@ -450,6 +447,7 @@ typedef void dh_makeshared_fn(void *st, uint8_t *secret,
 struct dh_if {
     void *st;
     int32_t len; /* Approximate size of modulus in bytes */
+    int32_t ceil_len; /* Number of bytes just sufficient to contain modulus */
     dh_makepublic_fn *makepublic;
     dh_makeshared_fn *makeshared;
 };