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nexthop.c

/*
 * lib/route/nexthop.c  Routing Nexthop
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation version 2.1
 *    of the License.
 *
 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
 */

/**
 * @ingroup route_obj
 * @defgroup nexthop Nexthop
 * @{
 */

#include <netlink-local.h>
#include <netlink/netlink.h>
#include <netlink/utils.h>
#include <netlink/route/rtnl.h>
#include <netlink/route/route.h>

/** @cond SKIP */
#define NH_ATTR_FLAGS   0x000001
#define NH_ATTR_WEIGHT  0x000002
#define NH_ATTR_IFINDEX 0x000004
#define NH_ATTR_GATEWAY 0x000008
#define NH_ATTR_REALMS  0x000010
/** @endcond */

/**
 * @name Allocation/Freeing
 * @{
 */

struct rtnl_nexthop *rtnl_route_nh_alloc(void)
{
      struct rtnl_nexthop *nh;

      nh = calloc(1, sizeof(*nh));
      if (!nh)
            return NULL;

      nl_init_list_head(&nh->rtnh_list);

      return nh;
}

struct rtnl_nexthop *rtnl_route_nh_clone(struct rtnl_nexthop *src)
{
      struct rtnl_nexthop *nh;

      nh = rtnl_route_nh_alloc();
      if (!nh)
            return NULL;

      nh->rtnh_flags = src->rtnh_flags;
      nh->rtnh_flag_mask = src->rtnh_flag_mask;
      nh->rtnh_weight = src->rtnh_weight;
      nh->rtnh_ifindex = src->rtnh_ifindex;
      nh->ce_mask = src->ce_mask;

      if (src->rtnh_gateway) {
            nh->rtnh_gateway = nl_addr_clone(src->rtnh_gateway);
            if (!nh->rtnh_gateway) {
                  free(nh);
                  return NULL;
            }
      }

      return nh;
}

void rtnl_route_nh_free(struct rtnl_nexthop *nh)
{
      nl_addr_put(nh->rtnh_gateway);
      free(nh);
}

/** @} */

int rtnl_route_nh_compare(struct rtnl_nexthop *a, struct rtnl_nexthop *b,
                    uint32_t attrs, int loose)
{
      int diff = 0;

#define NH_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, NH_ATTR_##ATTR, a, b, EXPR)

      diff |= NH_DIFF(IFINDEX,      a->rtnh_ifindex != b->rtnh_ifindex);
      diff |= NH_DIFF(WEIGHT,       a->rtnh_weight != b->rtnh_weight);
      diff |= NH_DIFF(REALMS,       a->rtnh_realms != b->rtnh_realms);
      diff |= NH_DIFF(GATEWAY,      nl_addr_cmp(a->rtnh_gateway,
                                        b->rtnh_gateway));

      if (loose)
            diff |= NH_DIFF(FLAGS,
                    (a->rtnh_flags ^ b->rtnh_flags) & b->rtnh_flag_mask);
      else
            diff |= NH_DIFF(FLAGS, a->rtnh_flags != b->rtnh_flags);
      
#undef NH_DIFF

      return diff;
}

static void nh_dump_line(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
{
      struct nl_cache *link_cache;
      char buf[128];

      link_cache = nl_cache_mngt_require("route/link");

      nl_dump(dp, "via");

      if (nh->ce_mask & NH_ATTR_GATEWAY)
            nl_dump(dp, " %s", nl_addr2str(nh->rtnh_gateway,
                                       buf, sizeof(buf)));

      if(nh->ce_mask & NH_ATTR_IFINDEX) {
            if (link_cache) {
                  nl_dump(dp, " dev %s",
                        rtnl_link_i2name(link_cache,
                                     nh->rtnh_ifindex,
                                     buf, sizeof(buf)));
            } else
                  nl_dump(dp, " dev %d", nh->rtnh_ifindex);
      }

      nl_dump(dp, " ");
}

static void nh_dump_details(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
{
      struct nl_cache *link_cache;
      char buf[128];

      link_cache = nl_cache_mngt_require("route/link");

      nl_dump(dp, "nexthop");

      if (nh->ce_mask & NH_ATTR_GATEWAY)
            nl_dump(dp, " via %s", nl_addr2str(nh->rtnh_gateway,
                                       buf, sizeof(buf)));

      if(nh->ce_mask & NH_ATTR_IFINDEX) {
            if (link_cache) {
                  nl_dump(dp, " dev %s",
                        rtnl_link_i2name(link_cache,
                                     nh->rtnh_ifindex,
                                     buf, sizeof(buf)));
            } else
                  nl_dump(dp, " dev %d", nh->rtnh_ifindex);
      }

      if (nh->ce_mask & NH_ATTR_WEIGHT)
            nl_dump(dp, " weight %u", nh->rtnh_weight);

      if (nh->ce_mask & NH_ATTR_REALMS)
            nl_dump(dp, " realm %04x:%04x",
                  RTNL_REALM_FROM(nh->rtnh_realms),
                  RTNL_REALM_TO(nh->rtnh_realms));

      if (nh->ce_mask & NH_ATTR_FLAGS)
            nl_dump(dp, " <%s>", rtnl_route_nh_flags2str(nh->rtnh_flags,
                                          buf, sizeof(buf)));
}

static void nh_dump_env(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
{
      struct nl_cache *link_cache;
      char buf[128];

      link_cache = nl_cache_mngt_require("route/link");

      if (nh->ce_mask & NH_ATTR_GATEWAY)
            nl_dump_line(dp, "ROUTE_NH%d_VIA=%s\n", dp->dp_ivar,
                  nl_addr2str(nh->rtnh_gateway, buf, sizeof(buf)));

      if(nh->ce_mask & NH_ATTR_IFINDEX) {
            if (link_cache) {
                  nl_dump_line(dp, "ROUTE_NH%d_DEV=%s\n", dp->dp_ivar,
                              rtnl_link_i2name(link_cache,
                                     nh->rtnh_ifindex,
                                     buf, sizeof(buf)));
            } else
                  nl_dump_line(dp, "ROUTE_NH%d_DEV=%d\n", dp->dp_ivar,
                              nh->rtnh_ifindex);
      }

      if (nh->ce_mask & NH_ATTR_WEIGHT)
            nl_dump_line(dp, "ROUTE_NH%d_WEIGHT=%u\n", dp->dp_ivar,
                        nh->rtnh_weight);

      if (nh->ce_mask & NH_ATTR_REALMS)
            nl_dump_line(dp, "ROUTE_NH%d_REALM=%04x:%04x\n", dp->dp_ivar,
                  RTNL_REALM_FROM(nh->rtnh_realms),
                  RTNL_REALM_TO(nh->rtnh_realms));

      if (nh->ce_mask & NH_ATTR_FLAGS)
            nl_dump_line(dp, "ROUTE_NH%d_FLAGS=<%s>\n", dp->dp_ivar,
                  rtnl_route_nh_flags2str(nh->rtnh_flags,
                                          buf, sizeof(buf)));
}
void rtnl_route_nh_dump(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
{
      switch (dp->dp_type) {
      case NL_DUMP_LINE:
            nh_dump_line(nh, dp);
            break;

      case NL_DUMP_DETAILS:
      case NL_DUMP_STATS:
            if (dp->dp_ivar == NH_DUMP_FROM_DETAILS)
                  nh_dump_details(nh, dp);
            break;

      case NL_DUMP_ENV:
            nh_dump_env(nh, dp);
            break;
      
      default:
            break;
      }
}

/**
 * @name Attributes
 * @{
 */

void rtnl_route_nh_set_weight(struct rtnl_nexthop *nh, uint8_t weight)
{
      nh->rtnh_weight = weight;
      nh->ce_mask |= NH_ATTR_WEIGHT;
}

uint8_t rtnl_route_nh_get_weight(struct rtnl_nexthop *nh)
{
      return nh->rtnh_weight;
}

void rtnl_route_nh_set_ifindex(struct rtnl_nexthop *nh, int ifindex)
{
      nh->rtnh_ifindex = ifindex;
      nh->ce_mask |= NH_ATTR_IFINDEX;
}

int rtnl_route_nh_get_ifindex(struct rtnl_nexthop *nh)
{
      return nh->rtnh_ifindex;
}     

void rtnl_route_nh_set_gateway(struct rtnl_nexthop *nh, struct nl_addr *addr)
{
      struct nl_addr *old = nh->rtnh_gateway;

      if (addr) {
            nh->rtnh_gateway = nl_addr_get(addr);
            nh->ce_mask |= NH_ATTR_GATEWAY;
      } else {
            nh->ce_mask &= ~NH_ATTR_GATEWAY;
            nh->rtnh_gateway = NULL;
      }

      if (old)
            nl_addr_put(old);
}

struct nl_addr *rtnl_route_nh_get_gateway(struct rtnl_nexthop *nh)
{
      return nh->rtnh_gateway;
}

void rtnl_route_nh_set_flags(struct rtnl_nexthop *nh, unsigned int flags)
{
      nh->rtnh_flag_mask |= flags;
      nh->rtnh_flags |= flags;
      nh->ce_mask |= NH_ATTR_FLAGS;
}

void rtnl_route_nh_unset_flags(struct rtnl_nexthop *nh, unsigned int flags)
{
      nh->rtnh_flag_mask |= flags;
      nh->rtnh_flags &= ~flags;
      nh->ce_mask |= NH_ATTR_FLAGS;
}

unsigned int rtnl_route_nh_get_flags(struct rtnl_nexthop *nh)
{
      return nh->rtnh_flags;
}

void rtnl_route_nh_set_realms(struct rtnl_nexthop *nh, uint32_t realms)
{
      nh->rtnh_realms = realms;
      nh->ce_mask |= NH_ATTR_REALMS;
}

uint32_t rtnl_route_nh_get_realms(struct rtnl_nexthop *nh)
{
      return nh->rtnh_realms;
}

/** @} */

/**
 * @name Nexthop Flags Translations
 * @{
 */

static struct trans_tbl nh_flags[] = {
      __ADD(RTNH_F_DEAD, dead)
      __ADD(RTNH_F_PERVASIVE, pervasive)
      __ADD(RTNH_F_ONLINK, onlink)
};

char *rtnl_route_nh_flags2str(int flags, char *buf, size_t len)
{
      return __flags2str(flags, buf, len, nh_flags, ARRAY_SIZE(nh_flags));
}

int rtnl_route_nh_str2flags(const char *name)
{
      return __str2flags(name, nh_flags, ARRAY_SIZE(nh_flags));
}

/** @} */

/** @} */

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