nexthop.c

00001 /*
00002  * lib/route/nexthop.c  Routing Nexthop
00003  *
00004  *      This library is free software; you can redistribute it and/or
00005  *      modify it under the terms of the GNU Lesser General Public
00006  *      License as published by the Free Software Foundation version 2.1
00007  *      of the License.
00008  *
00009  * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
00010  */
00011 
00012 /**
00013  * @ingroup route_obj
00014  * @defgroup nexthop Nexthop
00015  * @{
00016  */
00017 
00018 #include <netlink-local.h>
00019 #include <netlink/netlink.h>
00020 #include <netlink/utils.h>
00021 #include <netlink/route/rtnl.h>
00022 #include <netlink/route/route.h>
00023 
00024 /** @cond SKIP */
00025 #define NH_ATTR_FLAGS   0x000001
00026 #define NH_ATTR_WEIGHT  0x000002
00027 #define NH_ATTR_IFINDEX 0x000004
00028 #define NH_ATTR_GATEWAY 0x000008
00029 #define NH_ATTR_REALMS  0x000010
00030 /** @endcond */
00031 
00032 /**
00033  * @name Allocation/Freeing
00034  * @{
00035  */
00036 
00037 struct rtnl_nexthop *rtnl_route_nh_alloc(void)
00038 {
00039         struct rtnl_nexthop *nh;
00040 
00041         nh = calloc(1, sizeof(*nh));
00042         if (!nh)
00043                 return NULL;
00044 
00045         nl_init_list_head(&nh->rtnh_list);
00046 
00047         return nh;
00048 }
00049 
00050 struct rtnl_nexthop *rtnl_route_nh_clone(struct rtnl_nexthop *src)
00051 {
00052         struct rtnl_nexthop *nh;
00053 
00054         nh = rtnl_route_nh_alloc();
00055         if (!nh)
00056                 return NULL;
00057 
00058         nh->rtnh_flags = src->rtnh_flags;
00059         nh->rtnh_flag_mask = src->rtnh_flag_mask;
00060         nh->rtnh_weight = src->rtnh_weight;
00061         nh->rtnh_ifindex = src->rtnh_ifindex;
00062         nh->ce_mask = src->ce_mask;
00063 
00064         if (src->rtnh_gateway) {
00065                 nh->rtnh_gateway = nl_addr_clone(src->rtnh_gateway);
00066                 if (!nh->rtnh_gateway) {
00067                         free(nh);
00068                         return NULL;
00069                 }
00070         }
00071 
00072         return nh;
00073 }
00074 
00075 void rtnl_route_nh_free(struct rtnl_nexthop *nh)
00076 {
00077         nl_addr_put(nh->rtnh_gateway);
00078         free(nh);
00079 }
00080 
00081 /** @} */
00082 
00083 int rtnl_route_nh_compare(struct rtnl_nexthop *a, struct rtnl_nexthop *b,
00084                           uint32_t attrs, int loose)
00085 {
00086         int diff = 0;
00087 
00088 #define NH_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, NH_ATTR_##ATTR, a, b, EXPR)
00089 
00090         diff |= NH_DIFF(IFINDEX,        a->rtnh_ifindex != b->rtnh_ifindex);
00091         diff |= NH_DIFF(WEIGHT,         a->rtnh_weight != b->rtnh_weight);
00092         diff |= NH_DIFF(REALMS,         a->rtnh_realms != b->rtnh_realms);
00093         diff |= NH_DIFF(GATEWAY,        nl_addr_cmp(a->rtnh_gateway,
00094                                                     b->rtnh_gateway));
00095 
00096         if (loose)
00097                 diff |= NH_DIFF(FLAGS,
00098                           (a->rtnh_flags ^ b->rtnh_flags) & b->rtnh_flag_mask);
00099         else
00100                 diff |= NH_DIFF(FLAGS, a->rtnh_flags != b->rtnh_flags);
00101         
00102 #undef NH_DIFF
00103 
00104         return diff;
00105 }
00106 
00107 static void nh_dump_line(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
00108 {
00109         struct nl_cache *link_cache;
00110         char buf[128];
00111 
00112         link_cache = nl_cache_mngt_require("route/link");
00113 
00114         nl_dump(dp, "via");
00115 
00116         if (nh->ce_mask & NH_ATTR_GATEWAY)
00117                 nl_dump(dp, " %s", nl_addr2str(nh->rtnh_gateway,
00118                                                    buf, sizeof(buf)));
00119 
00120         if(nh->ce_mask & NH_ATTR_IFINDEX) {
00121                 if (link_cache) {
00122                         nl_dump(dp, " dev %s",
00123                                 rtnl_link_i2name(link_cache,
00124                                                  nh->rtnh_ifindex,
00125                                                  buf, sizeof(buf)));
00126                 } else
00127                         nl_dump(dp, " dev %d", nh->rtnh_ifindex);
00128         }
00129 
00130         nl_dump(dp, " ");
00131 }
00132 
00133 static void nh_dump_details(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
00134 {
00135         struct nl_cache *link_cache;
00136         char buf[128];
00137 
00138         link_cache = nl_cache_mngt_require("route/link");
00139 
00140         nl_dump(dp, "nexthop");
00141 
00142         if (nh->ce_mask & NH_ATTR_GATEWAY)
00143                 nl_dump(dp, " via %s", nl_addr2str(nh->rtnh_gateway,
00144                                                    buf, sizeof(buf)));
00145 
00146         if(nh->ce_mask & NH_ATTR_IFINDEX) {
00147                 if (link_cache) {
00148                         nl_dump(dp, " dev %s",
00149                                 rtnl_link_i2name(link_cache,
00150                                                  nh->rtnh_ifindex,
00151                                                  buf, sizeof(buf)));
00152                 } else
00153                         nl_dump(dp, " dev %d", nh->rtnh_ifindex);
00154         }
00155 
00156         if (nh->ce_mask & NH_ATTR_WEIGHT)
00157                 nl_dump(dp, " weight %u", nh->rtnh_weight);
00158 
00159         if (nh->ce_mask & NH_ATTR_REALMS)
00160                 nl_dump(dp, " realm %04x:%04x",
00161                         RTNL_REALM_FROM(nh->rtnh_realms),
00162                         RTNL_REALM_TO(nh->rtnh_realms));
00163 
00164         if (nh->ce_mask & NH_ATTR_FLAGS)
00165                 nl_dump(dp, " <%s>", rtnl_route_nh_flags2str(nh->rtnh_flags,
00166                                                         buf, sizeof(buf)));
00167 }
00168 
00169 void rtnl_route_nh_dump(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
00170 {
00171         switch (dp->dp_type) {
00172         case NL_DUMP_LINE:
00173                 nh_dump_line(nh, dp);
00174                 break;
00175 
00176         case NL_DUMP_DETAILS:
00177         case NL_DUMP_STATS:
00178                 if (dp->dp_ivar == NH_DUMP_FROM_DETAILS)
00179                         nh_dump_details(nh, dp);
00180                 break;
00181 
00182         default:
00183                 break;
00184         }
00185 }
00186 
00187 /**
00188  * @name Attributes
00189  * @{
00190  */
00191 
00192 void rtnl_route_nh_set_weight(struct rtnl_nexthop *nh, uint8_t weight)
00193 {
00194         nh->rtnh_weight = weight;
00195         nh->ce_mask |= NH_ATTR_WEIGHT;
00196 }
00197 
00198 uint8_t rtnl_route_nh_get_weight(struct rtnl_nexthop *nh)
00199 {
00200         return nh->rtnh_weight;
00201 }
00202 
00203 void rtnl_route_nh_set_ifindex(struct rtnl_nexthop *nh, int ifindex)
00204 {
00205         nh->rtnh_ifindex = ifindex;
00206         nh->ce_mask |= NH_ATTR_IFINDEX;
00207 }
00208 
00209 int rtnl_route_nh_get_ifindex(struct rtnl_nexthop *nh)
00210 {
00211         return nh->rtnh_ifindex;
00212 }       
00213 
00214 void rtnl_route_nh_set_gateway(struct rtnl_nexthop *nh, struct nl_addr *addr)
00215 {
00216         struct nl_addr *old = nh->rtnh_gateway;
00217 
00218         if (addr) {
00219                 nh->rtnh_gateway = nl_addr_get(addr);
00220                 nh->ce_mask |= NH_ATTR_GATEWAY;
00221         } else {
00222                 nh->ce_mask &= ~NH_ATTR_GATEWAY;
00223                 nh->rtnh_gateway = NULL;
00224         }
00225 
00226         if (old)
00227                 nl_addr_put(old);
00228 }
00229 
00230 struct nl_addr *rtnl_route_nh_get_gateway(struct rtnl_nexthop *nh)
00231 {
00232         return nh->rtnh_gateway;
00233 }
00234 
00235 void rtnl_route_nh_set_flags(struct rtnl_nexthop *nh, unsigned int flags)
00236 {
00237         nh->rtnh_flag_mask |= flags;
00238         nh->rtnh_flags |= flags;
00239         nh->ce_mask |= NH_ATTR_FLAGS;
00240 }
00241 
00242 void rtnl_route_nh_unset_flags(struct rtnl_nexthop *nh, unsigned int flags)
00243 {
00244         nh->rtnh_flag_mask |= flags;
00245         nh->rtnh_flags &= ~flags;
00246         nh->ce_mask |= NH_ATTR_FLAGS;
00247 }
00248 
00249 unsigned int rtnl_route_nh_get_flags(struct rtnl_nexthop *nh)
00250 {
00251         return nh->rtnh_flags;
00252 }
00253 
00254 void rtnl_route_nh_set_realms(struct rtnl_nexthop *nh, uint32_t realms)
00255 {
00256         nh->rtnh_realms = realms;
00257         nh->ce_mask |= NH_ATTR_REALMS;
00258 }
00259 
00260 uint32_t rtnl_route_nh_get_realms(struct rtnl_nexthop *nh)
00261 {
00262         return nh->rtnh_realms;
00263 }
00264 
00265 /** @} */
00266 
00267 /**
00268  * @name Nexthop Flags Translations
00269  * @{
00270  */
00271 
00272 static const struct trans_tbl nh_flags[] = {
00273         __ADD(RTNH_F_DEAD, dead)
00274         __ADD(RTNH_F_PERVASIVE, pervasive)
00275         __ADD(RTNH_F_ONLINK, onlink)
00276 };
00277 
00278 char *rtnl_route_nh_flags2str(int flags, char *buf, size_t len)
00279 {
00280         return __flags2str(flags, buf, len, nh_flags, ARRAY_SIZE(nh_flags));
00281 }
00282 
00283 int rtnl_route_nh_str2flags(const char *name)
00284 {
00285         return __str2flags(name, nh_flags, ARRAY_SIZE(nh_flags));
00286 }
00287 
00288 /** @} */
00289 
00290 /** @} */