+From 50bcf257f5f7d359d06744128585103f19072ee3 Mon Sep 17 00:00:00 2001
+From: Steven Barth <steven@midlink.org>
+Date: Thu, 10 Apr 2014 18:56:53 +0200
+Subject: [PATCH] Add compatibility code for uclibc
+
+---
+ pim6sd/cftoken.l | 5 ++
+ pim6sd/inet6_compat.c | 161 ++++++++++++++++++++++++++++++++++++++++++++++++++
+ pim6sd/mld6.c | 4 ++
+ pim6sd/mld6v2.c | 5 ++
+ 4 files changed, 175 insertions(+)
+ create mode 100644 pim6sd/inet6_compat.c
+
+diff --git a/pim6sd/cftoken.l b/pim6sd/cftoken.l
+index 17479d0..5b20741 100644
+--- a/pim6sd/cftoken.l
++++ b/pim6sd/cftoken.l
+@@ -697,3 +697,8 @@ cfparse(strict, debugonly)
+
+ return cf_post_config();
+ }
++
++int yywrap(void)
++{
++ return 1;
++}
+diff --git a/pim6sd/inet6_compat.c b/pim6sd/inet6_compat.c
+new file mode 100644
+index 0000000..375f17f
+--- /dev/null
++++ b/pim6sd/inet6_compat.c
+@@ -0,0 +1,161 @@
++#include <assert.h>
++
++static void
++add_pad (struct cmsghdr *cmsg, int len)
++{
++ unsigned char *p = CMSG_DATA (cmsg) + cmsg->cmsg_len - CMSG_LEN (0);
++
++ if (len == 1)
++ /* Special handling for 1, a one-byte solution. */
++ *p++ = IP6OPT_PAD1;
++ else if (len != 0)
++ {
++ /* Multibyte padding. */
++ *p++ = IP6OPT_PADN;
++ *p++ = len - 2; /* Discount the two header bytes. */
++ /* The rest is filled with zero. */
++ memset (p, '\0', len - 2);
++ p += len - 2;
++ }
++
++ /* Account for the bytes. */
++ cmsg->cmsg_len += len;
++}
++
++
++/* RFC 2292, 6.3.4
++
++ This function appends a Hop-by-Hop option or a Destination option
++ into an ancillary data object that has been initialized by
++ inet6_option_init(). This function returns a pointer to the 8-bit
++ option type field that starts the option on success, or NULL on an
++ error. */
++static uint8_t *
++option_alloc (struct cmsghdr *cmsg, int datalen, int multx, int plusy)
++{
++ /* The RFC limits the value of the alignment values. */
++ if ((multx != 1 && multx != 2 && multx != 4 && multx != 8)
++ || ! (plusy >= 0 && plusy <= 7))
++ return NULL;
++
++ /* Current data size. */
++ int dsize = cmsg->cmsg_len - CMSG_LEN (0);
++
++ /* The first two bytes of the option are for the extended header. */
++ if (__builtin_expect (dsize == 0, 0))
++ {
++ cmsg->cmsg_len += sizeof (struct ip6_ext);
++ dsize = sizeof (struct ip6_ext);
++ }
++
++ /* First add padding. */
++ add_pad (cmsg, ((multx - (dsize & (multx - 1))) & (multx - 1)) + plusy);
++
++ /* Return the pointer to the start of the option space. */
++ uint8_t *result = CMSG_DATA (cmsg) + cmsg->cmsg_len - CMSG_LEN (0);
++ cmsg->cmsg_len += datalen;
++
++ /* The extended option header length is measured in 8-byte groups.
++ To represent the current length we might have to add padding. */
++ dsize = cmsg->cmsg_len - CMSG_LEN (0);
++ add_pad (cmsg, (8 - (dsize & (8 - 1))) & (8 - 1));
++
++ /* Record the new length of the option. */
++ assert (((cmsg->cmsg_len - CMSG_LEN (0)) % 8) == 0);
++ int len8b = (cmsg->cmsg_len - CMSG_LEN (0)) / 8 - 1;
++ if (len8b >= 256)
++ /* Too long. */
++ return NULL;
++
++ struct ip6_ext *ie = (void *) CMSG_DATA (cmsg);
++ ie->ip6e_len = len8b;
++
++ return result;
++}
++
++
++/* RFC 2292, 6.3.1
++
++ This function returns the number of bytes required to hold an option
++ when it is stored as ancillary data, including the cmsghdr structure
++ at the beginning, and any padding at the end (to make its size a
++ multiple of 8 bytes). The argument is the size of the structure
++ defining the option, which must include any pad bytes at the
++ beginning (the value y in the alignment term "xn + y"), the type
++ byte, the length byte, and the option data. */
++static int
++inet6_option_space (nbytes)
++ int nbytes;
++{
++ /* Add room for the extension header. */
++ nbytes += sizeof (struct ip6_ext);
++
++ return CMSG_SPACE (roundup (nbytes, 8));
++}
++
++
++/* RFC 2292, 6.3.2
++
++ This function is called once per ancillary data object that will
++ contain either Hop-by-Hop or Destination options. It returns 0 on
++ success or -1 on an error. */
++static int
++inet6_option_init (bp, cmsgp, type)
++ void *bp;
++ struct cmsghdr **cmsgp;
++ int type;
++{
++ /* Only Hop-by-Hop or Destination options allowed. */
++ if (type != IPV6_HOPOPTS && type != IPV6_DSTOPTS)
++ return -1;
++
++ /* BP is a pointer to the previously allocated space. */
++ struct cmsghdr *newp = (struct cmsghdr *) bp;
++
++ /* Initialize the message header.
++
++ Length: No data yet, only the cmsghdr struct. */
++ newp->cmsg_len = CMSG_LEN (0);
++ /* Originating protocol: obviously IPv6. */
++ newp->cmsg_level = IPPROTO_IPV6;
++ /* Message type. */
++ newp->cmsg_type = type;
++
++ /* Pass up the result. */
++ *cmsgp = newp;
++
++ return 0;
++}
++
++
++/* RFC 2292, 6.3.3
++
++ This function appends a Hop-by-Hop option or a Destination option
++ into an ancillary data object that has been initialized by
++ inet6_option_init(). This function returns 0 if it succeeds or -1 on
++ an error. */
++static int
++inet6_option_append (cmsg, typep, multx, plusy)
++ struct cmsghdr *cmsg;
++ const uint8_t *typep;
++ int multx;
++ int plusy;
++{
++ /* typep is a pointer to the 8-bit option type. It is assumed that this
++ field is immediately followed by the 8-bit option data length field,
++ which is then followed immediately by the option data.
++
++ The option types IP6OPT_PAD1 and IP6OPT_PADN also must be handled. */
++ int len = typep[0] == IP6OPT_PAD1 ? 1 : typep[1] + 2;
++
++ /* Get the pointer to the space in the message. */
++ uint8_t *ptr = option_alloc (cmsg, len, multx, plusy);
++ if (ptr == NULL)
++ /* Some problem with the parameters. */
++ return -1;
++
++ /* Copy the content. */
++ memcpy (ptr, typep, len);
++
++ return 0;
++}
+diff --git a/pim6sd/mld6.c b/pim6sd/mld6.c
+index 0bac85d..febdc98 100644
+--- a/pim6sd/mld6.c
++++ b/pim6sd/mld6.c
+@@ -108,6 +108,10 @@
+ #include "trace.h"
+ #include "mld6.h"
+
++#ifdef __UCLIBC__
++#include "inet6_compat.c"
++#endif
++
+ /*
+ * Exported variables.
+ */
+diff --git a/pim6sd/mld6v2.c b/pim6sd/mld6v2.c
+index 8cd5a4d..322cb7b 100644
+--- a/pim6sd/mld6v2.c
++++ b/pim6sd/mld6v2.c
+@@ -73,6 +73,11 @@
+ #include "callout.h"
+ #include "timer.h"
+
++#ifdef __UCLIBC__
++#include "inet6_compat.c"
++#endif
++
++
+ #ifdef HAVE_MLDV2
+
+ #ifndef HAVE_RFC3542
+--
+1.9.1
+