Support for SOL_MAX_RT and INF_MAX_RT options (RFC7083)

[odhcp6c.git] / src / dhcpv6.c

diff --git a/src/dhcpv6.c b/src/dhcpv6.c
index 8d65219eb8d4ccfe073ab214750aef49f9f9380a..7fdf4f68c6fcc46f292c65e19e5998ce858e457f 100644 (file)
--- a/src/dhcpv6.c
+++ b/src/dhcpv6.c
@@ -43,6 +43,10 @@
 #define DHCPV6_DUID_LLADDR 3
 #define DHCPV6_REQ_DELAY 1
 
+#define DHCPV6_SOL_MAX_RT_MIN 60
+#define DHCPV6_SOL_MAX_RT_MAX 86400
+#define DHCPV6_INF_MAX_RT_MIN 60
+#define DHCPV6_INF_MAX_RT_MAX 86400
 
 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
                const uint8_t transaction[3], enum dhcpv6_msg type,
@@ -74,17 +78,17 @@ static int dhcpv6_commit_advert(void);
 static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
        [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, 0, "<POLL>",
                        dhcpv6_handle_reconfigure, NULL},
-       [DHCPV6_MSG_SOLICIT] = {true, 1, 3600, 0, "SOLICIT",
+       [DHCPV6_MSG_SOLICIT] = {true, 1, DHCPV6_SOL_MAX_RT, 0, "SOLICIT",
                        dhcpv6_handle_advert, dhcpv6_commit_advert},
-       [DHCPV6_MSG_REQUEST] = {true, 1, 30, 10, "REQUEST",
+       [DHCPV6_MSG_REQUEST] = {true, 1, DHCPV6_REQ_MAX_RT, 10, "REQUEST",
                        dhcpv6_handle_reply, NULL},
-       [DHCPV6_MSG_RENEW] = {false, 10, 600, 0, "RENEW",
+       [DHCPV6_MSG_RENEW] = {false, 10, DHCPV6_REN_MAX_RT, 0, "RENEW",
                        dhcpv6_handle_reply, NULL},
-       [DHCPV6_MSG_REBIND] = {false, 10, 600, 0, "REBIND",
+       [DHCPV6_MSG_REBIND] = {false, 10, DHCPV6_REB_MAX_RT, 0, "REBIND",
                        dhcpv6_handle_rebind_reply, NULL},
        [DHCPV6_MSG_RELEASE] = {false, 1, 0, 5, "RELEASE", NULL, NULL},
        [DHCPV6_MSG_DECLINE] = {false, 1, 0, 5, "DECLINE", NULL, NULL},
-       [DHCPV6_MSG_INFO_REQ] = {true, 1, 120, 0, "INFOREQ",
+       [DHCPV6_MSG_INFO_REQ] = {true, 1, DHCPV6_INF_MAX_RT, 0, "INFOREQ",
                        dhcpv6_handle_reply, NULL},
 };
 
@@ -166,6 +170,8 @@ int init_dhcpv6(const char *ifname, int request_pd, int sol_timeout)
                        htons(DHCPV6_OPT_NTP_SERVER),
                        htons(DHCPV6_OPT_AFTR_NAME),
                        htons(DHCPV6_OPT_PD_EXCLUDE),
+                       htons(DHCPV6_OPT_SOL_MAX_RT),
+                       htons(DHCPV6_OPT_INF_MAX_RT),
 #ifdef EXT_PREFIX_CLASS
                        htons(DHCPV6_OPT_PREFIX_CLASS),
 #endif
@@ -673,7 +679,8 @@ static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
        uint16_t olen, otype;
        uint8_t *odata, pref = 0;
        struct dhcpv6_server_cand cand = {false, false, 0, 0, {0},
-                                       IN6ADDR_ANY_INIT, NULL, NULL, 0, 0};
+                                       IN6ADDR_ANY_INIT, DHCPV6_SOL_MAX_RT, 
+                                       DHCPV6_INF_MAX_RT, NULL, NULL, 0, 0};
        bool have_na = false;
        int have_pd = 0;
 
@@ -694,17 +701,9 @@ static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
                        switch (error) {
                        case DHCPV6_NoPrefixAvail:
                                // Status code on global level
-                               if (pd_mode == IA_MODE_FORCE)
-                                       return -1;
                                cand.preference -= 2000;
                                break;
 
-                       case DHCPV6_NoAddrsAvail:
-                               // Status code on global level
-                               if (na_mode == IA_MODE_FORCE)
-                                       return -1;
-                               break;
-
                        default :
                                break;
                        }
@@ -715,6 +714,16 @@ static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
                        cand.server_addr = *(struct in6_addr *)odata;
                } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
                        cand.wants_reconfigure = true;
+               } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
+                       uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
+                       if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN && 
+                                       sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
+                               cand.sol_max_rt = sol_max_rt;
+               } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
+                       uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
+                       if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN && 
+                                       inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
+                               cand.inf_max_rt = inf_max_rt;
                } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
                        struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
                        uint8_t *oend = odata + olen, *d;
@@ -735,8 +744,16 @@ static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
        }
 
        if ((!have_na && na_mode == IA_MODE_FORCE) ||
-                       (!have_pd && pd_mode == IA_MODE_FORCE))
+                       (!have_pd && pd_mode == IA_MODE_FORCE)) {
+               /* 
+                * RFC7083 states to process the SOL_MAX_RT and 
+                * INF_MAX_RT options even if the DHCPv6 server
+                * did not propose any IA_NA and/or IA_PD
+                */
+               dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand.sol_max_rt;
+               dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand.inf_max_rt;
                return -1;
+       }
 
        if (na_mode != IA_MODE_NONE && !have_na) {
                cand.has_noaddravail = true;
@@ -910,7 +927,17 @@ static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc,
                        odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
                        if (cur_len == 0)
                                odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
-               } else if (otype != DHCPV6_OPT_CLIENTID &&
+               } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
+                       uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
+                       if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN && 
+                                       sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
+                               dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_max_rt;
+               } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
+                       uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
+                       if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN && 
+                                       inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
+                               dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = inf_max_rt;
+               }else if (otype != DHCPV6_OPT_CLIENTID &&
                                otype != DHCPV6_OPT_SERVERID) {
                        odhcp6c_add_state(STATE_CUSTOM_OPTS,
                                        &odata[-4], olen + 4);
@@ -1281,6 +1308,10 @@ int dhcpv6_promote_server_cand(void)
 
        if (cand->has_noaddravail && na_mode == IA_MODE_TRY) {
                na_mode = IA_MODE_NONE;
+
+               dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
+               dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
+
                return dhcpv6_request(DHCPV6_MSG_SOLICIT);
        }
 
@@ -1302,6 +1333,9 @@ int dhcpv6_promote_server_cand(void)
                        ret = DHCPV6_STATEFUL;
        }
 
+       dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
+       dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
+       
        odhcp6c_remove_state(STATE_SERVER_CAND, 0, sizeof(*cand));
 
        return ret;