/* Interface function for the kernel routing table updates. Support
for RTM_CHANGE will be needed. */
int
rtm_write (int message,
union sockunion *dest,
union sockunion *mask,
union sockunion *gate,
unsigned int index,
int zebra_flags,
int metric)
{
int ret;
caddr_t pnt;
struct interface *ifp;
struct sockaddr_in tmp_gate;
#ifdef HAVE_IPV6
struct sockaddr_in6 tmp_gate6;
#endif /* HAVE_IPV6 */
/* Sequencial number of routing message. */
static int msg_seq = 0;
/* Struct of rt_msghdr and buffer for storing socket's data. */
struct
{
struct rt_msghdr rtm;
char buf[512];
} msg;
memset (&tmp_gate, 0, sizeof (struct sockaddr_in));
tmp_gate.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
tmp_gate.sin_len = sizeof (struct sockaddr_in);
#endif /* HAVE_SIN_LEN */
#ifdef HAVE_IPV6
memset (&tmp_gate6, 0, sizeof (struct sockaddr_in6));
tmp_gate6.sin6_family = AF_INET6;
#ifdef SIN6_LEN
tmp_gate6.sin6_len = sizeof (struct sockaddr_in6);
#endif /* SIN6_LEN */
#endif /* HAVE_IPV6 */
if (routing_sock < 0)
return ZEBRA_ERR_EPERM;
/* Clear and set rt_msghdr values */
memset (&msg, 0, sizeof (struct rt_msghdr));
msg.rtm.rtm_version = RTM_VERSION;
msg.rtm.rtm_type = message;
msg.rtm.rtm_seq = msg_seq++;
msg.rtm.rtm_addrs = RTA_DST;
msg.rtm.rtm_addrs |= RTA_GATEWAY;
msg.rtm.rtm_flags = RTF_UP;
msg.rtm.rtm_index = index;
if (metric != 0)
{
msg.rtm.rtm_rmx.rmx_hopcount = metric;
msg.rtm.rtm_inits |= RTV_HOPCOUNT;
}
ifp = if_lookup_by_index (index);
if (gate && message == RTM_ADD)
msg.rtm.rtm_flags |= RTF_GATEWAY;
if (! gate && message == RTM_ADD && ifp &&
(ifp->flags & IFF_POINTOPOINT) == 0)
msg.rtm.rtm_flags |= RTF_CLONING;
/* If no protocol specific gateway is specified, use link
address for gateway. */
if (! gate)
{
if (!ifp)
{
zlog_warn ("no gateway found for interface index %d", index);
return -1;
}
gate = (union sockunion *) & ifp->sdl;
}
if (mask)
msg.rtm.rtm_addrs |= RTA_NETMASK;
else if (message == RTM_ADD)
msg.rtm.rtm_flags |= RTF_HOST;
/* Tagging route with flags */
msg.rtm.rtm_flags |= (RTF_PROTO1);
/* Additional flags. */
if (zebra_flags & ZEBRA_FLAG_BLACKHOLE)
msg.rtm.rtm_flags |= RTF_BLACKHOLE;
#ifdef HAVE_SIN_LEN
#define SOCKADDRSET(X,R) \
if (msg.rtm.rtm_addrs & (R)) \
{ \
int len = ROUNDUP ((X)->sa.sa_len); \
memcpy (pnt, (caddr_t)(X), len); \
pnt += len; \
}
#else
#define SOCKADDRSET(X,R) \
if (msg.rtm.rtm_addrs & (R)) \
{ \
int len = ROUNDUP (sizeof((X)->sa)); \
memcpy (pnt, (caddr_t)(X), len); \
pnt += len; \
}
#endif /* HAVE_SIN_LEN */
pnt = (caddr_t) msg.buf;
/* Write each socket data into rtm message buffer */
SOCKADDRSET (dest, RTA_DST);
SOCKADDRSET (gate, RTA_GATEWAY);
SOCKADDRSET (mask, RTA_NETMASK);
msg.rtm.rtm_msglen = pnt - (caddr_t) &msg;
ret = write (routing_sock, &msg, msg.rtm.rtm_msglen);
if (ret != msg.rtm.rtm_msglen)
{
if (errno == EEXIST)
return ZEBRA_ERR_RTEXIST;
if (errno == ENETUNREACH)
return ZEBRA_ERR_RTUNREACH;
zlog_warn ("write : %s (%d)", strerror (errno), errno);
return -1;
}
return 0;
}
/* Interface function for the kernel routing table updates. Support
* for RTM_CHANGE will be needed.
* Exported only for rt_socket.c
*/
int
rtm_write (int message,
union sockunion *dest,
union sockunion *mask,
union sockunion *gate,
unsigned int index,
int zebra_flags,
int metric)
{
int ret;
caddr_t pnt;
struct interface *ifp;
/* Sequencial number of routing message. */
static int msg_seq = 0;
/* Struct of rt_msghdr and buffer for storing socket's data. */
struct
{
struct rt_msghdr rtm;
char buf[512];
} msg;
if (routing_sock < 0)
return ZEBRA_ERR_EPERM;
/* Clear and set rt_msghdr values */
memset (&msg, 0, sizeof (struct rt_msghdr));
msg.rtm.rtm_version = RTM_VERSION;
msg.rtm.rtm_type = message;
msg.rtm.rtm_seq = msg_seq++;
msg.rtm.rtm_addrs = RTA_DST;
msg.rtm.rtm_addrs |= RTA_GATEWAY;
msg.rtm.rtm_flags = RTF_UP;
msg.rtm.rtm_index = index;
if (metric != 0)
{
msg.rtm.rtm_rmx.rmx_hopcount = metric;
msg.rtm.rtm_inits |= RTV_HOPCOUNT;
}
ifp = if_lookup_by_index (index);
if (gate && message == RTM_ADD)
msg.rtm.rtm_flags |= RTF_GATEWAY;
/* When RTF_CLONING is unavailable on BSD, should we set some
* other flag instead?
*/
#ifdef RTF_CLONING
if (! gate && message == RTM_ADD && ifp &&
(ifp->flags & IFF_POINTOPOINT) == 0)
msg.rtm.rtm_flags |= RTF_CLONING;
#endif /* RTF_CLONING */
/* If no protocol specific gateway is specified, use link
address for gateway. */
if (! gate)
{
if (!ifp)
{
char dest_buf[INET_ADDRSTRLEN] = "NULL", mask_buf[INET_ADDRSTRLEN] = "255.255.255.255";
if (dest)
inet_ntop (AF_INET, &dest->sin.sin_addr, dest_buf, INET_ADDRSTRLEN);
if (mask)
inet_ntop (AF_INET, &mask->sin.sin_addr, mask_buf, INET_ADDRSTRLEN);
zlog_warn ("%s: %s/%s: gate == NULL and no gateway found for ifindex %d",
__func__, dest_buf, mask_buf, index);
return -1;
}
gate = (union sockunion *) & ifp->sdl;
}
if (mask)
msg.rtm.rtm_addrs |= RTA_NETMASK;
else if (message == RTM_ADD)
msg.rtm.rtm_flags |= RTF_HOST;
/* Tagging route with flags */
msg.rtm.rtm_flags |= (RTF_PROTO1);
/* Additional flags. */
if (zebra_flags & ZEBRA_FLAG_BLACKHOLE)
msg.rtm.rtm_flags |= RTF_BLACKHOLE;
if (zebra_flags & ZEBRA_FLAG_REJECT)
msg.rtm.rtm_flags |= RTF_REJECT;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
#define SOCKADDRSET(X,R) \
if (msg.rtm.rtm_addrs & (R)) \
{ \
int len = ROUNDUP ((X)->sa.sa_len); \
memcpy (pnt, (caddr_t)(X), len); \
pnt += len; \
}
#else
#define SOCKADDRSET(X,R) \
if (msg.rtm.rtm_addrs & (R)) \
{ \
int len = SAROUNDUP (X); \
memcpy (pnt, (caddr_t)(X), len); \
pnt += len; \
}
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
pnt = (caddr_t) msg.buf;
/* Write each socket data into rtm message buffer */
SOCKADDRSET (dest, RTA_DST);
SOCKADDRSET (gate, RTA_GATEWAY);
SOCKADDRSET (mask, RTA_NETMASK);
msg.rtm.rtm_msglen = pnt - (caddr_t) &msg;
ret = write (routing_sock, &msg, msg.rtm.rtm_msglen);
if (ret != msg.rtm.rtm_msglen)
{
if (errno == EEXIST)
return ZEBRA_ERR_RTEXIST;
if (errno == ENETUNREACH)
return ZEBRA_ERR_RTUNREACH;
if (errno == ESRCH)
return ZEBRA_ERR_RTNOEXIST;
zlog_warn ("%s: write : %s (%d)", __func__, safe_strerror (errno), errno);
return ZEBRA_ERR_KERNEL;
}
return ZEBRA_ERR_NOERROR;
}
