diff options
Diffstat (limited to 'inet/inet6_option.c')
-rw-r--r-- | inet/inet6_option.c | 349 |
1 files changed, 0 insertions, 349 deletions
diff --git a/inet/inet6_option.c b/inet/inet6_option.c deleted file mode 100644 index f6d9b5dffe..0000000000 --- a/inet/inet6_option.c +++ /dev/null @@ -1,349 +0,0 @@ -/* Copyright (C) 2003-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@redhat.com>, 2003. - - The GNU C 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; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <assert.h> -#include <string.h> -#include <netinet/in.h> -#include <netinet/ip6.h> -#include <sys/param.h> - - -static void -internal_function -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; -} - - -static int -get_opt_end (const uint8_t **result, const uint8_t *startp, - const uint8_t *endp) -{ - if (startp >= endp) - /* Out of bounds. */ - return -1; - - if (*startp == IP6OPT_PAD1) - { - /* Just this one byte. */ - *result = startp + 1; - return 0; - } - - /* Now we know there must be at least two bytes. */ - if (startp + 2 > endp - /* Now we can get the length byte. */ - || startp + startp[1] + 2 > endp) - return -1; - - *result = startp + startp[1] + 2; - - return 0; -} - - -static uint8_t *option_alloc (struct cmsghdr *cmsg, int datalen, int multx, - int plusy); - - -/* 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. */ -int -inet6_option_space (int nbytes) -{ - /* Add room for the extension header. */ - nbytes += sizeof (struct ip6_ext); - - return CMSG_SPACE (roundup (nbytes, 8)); -} -link_warning (inet6_option_space, - "inet6_option_space is obsolete, use the RFC 3542 interfaces") - - -/* 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. */ -int -inet6_option_init (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; -} -link_warning (inet6_option_init, - "inet6_option_init is obsolete, use the RFC 3542 interfaces") - - -/* 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. */ -int -inet6_option_append (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; -} -link_warning (inet6_option_append, - "inet6_option_append is obsolete, use the RFC 3542 interfaces") - - -/* 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 (__glibc_unlikely (dsize == 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; -} - - -uint8_t * -inet6_option_alloc (struct cmsghdr *cmsg, int datalen, int multx, int plusy) -{ - return option_alloc (cmsg, datalen, multx, plusy); -} -link_warning (inet6_option_alloc, - "inet6_option_alloc is obsolete, use the RFC 3542 interfaces") - - -/* RFC 2292, 6.3.5 - - This function processes the next Hop-by-Hop option or Destination - option in an ancillary data object. If another option remains to be - processed, the return value of the function is 0 and *tptrp points to - the 8-bit option type field (which is followed by the 8-bit option - data length, followed by the option data). If no more options remain - to be processed, the return value is -1 and *tptrp is NULL. If an - error occurs, the return value is -1 and *tptrp is not NULL. */ -int -inet6_option_next (const struct cmsghdr *cmsg, uint8_t **tptrp) -{ - /* Make sure it is an option of the right type. */ - if (cmsg->cmsg_level != IPPROTO_IPV6 - || (cmsg->cmsg_type != IPV6_HOPOPTS && cmsg->cmsg_type != IPV6_DSTOPTS)) - return -1; - - /* Pointer to the extension header. We only compute the address, we - don't access anything yet. */ - const struct ip6_ext *ip6e = (const struct ip6_ext *) CMSG_DATA (cmsg); - - /* Make sure the message is long enough. */ - if (cmsg->cmsg_len < CMSG_LEN (sizeof (struct ip6_ext)) - /* Now we can access the extension header. */ - || cmsg->cmsg_len < CMSG_LEN ((ip6e->ip6e_len + 1) * 8)) - /* Too small. */ - return -1; - - /* Determine the address of the byte past the message. */ - const uint8_t *endp = CMSG_DATA (cmsg) + (ip6e->ip6e_len + 1) * 8; - - const uint8_t *result; - if (*tptrp == NULL) - /* This is the first call, return the first option if there is one. */ - result = (const uint8_t *) (ip6e + 1); - else - { - /* Make sure *TPTRP points to a beginning of a new option in - the message. The upper limit is checked in get_opt_end. */ - if (*tptrp < (const uint8_t *) (ip6e + 1)) - return -1; - - /* Get the beginning of the next option. */ - if (get_opt_end (&result, *tptrp, endp) != 0) - return -1; - } - - /* We know where the next option starts. */ - *tptrp = (uint8_t *) result; - - /* Check the option is fully represented in the message. */ - return get_opt_end (&result, result, endp); -} -link_warning (inet6_option_next, - "inet6_option_next is obsolete, use the RFC 3542 interfaces") - - -/* RFC 2292, 6.3.6 - - This function is similar to the previously described - inet6_option_next() function, except this function lets the caller - specify the option type to be searched for, instead of always - returning the next option in the ancillary data object. cmsg is a - pointer to cmsghdr structure of which cmsg_level equals IPPROTO_IPV6 - and cmsg_type equals either IPV6_HOPOPTS or IPV6_DSTOPTS. */ -int -inet6_option_find (const struct cmsghdr *cmsg, uint8_t **tptrp, int type) -{ - /* Make sure it is an option of the right type. */ - if (cmsg->cmsg_level != IPPROTO_IPV6 - || (cmsg->cmsg_type != IPV6_HOPOPTS && cmsg->cmsg_type != IPV6_DSTOPTS)) - return -1; - - /* Pointer to the extension header. We only compute the address, we - don't access anything yet. */ - const struct ip6_ext *ip6e = (const struct ip6_ext *) CMSG_DATA (cmsg); - - /* Make sure the message is long enough. */ - if (cmsg->cmsg_len < CMSG_LEN (sizeof (struct ip6_ext)) - /* Now we can access the extension header. */ - || cmsg->cmsg_len < CMSG_LEN ((ip6e->ip6e_len + 1) * 8)) - /* Too small. */ - return -1; - - /* Determine the address of the byte past the message. */ - const uint8_t *endp = CMSG_DATA (cmsg) + (ip6e->ip6e_len + 1) * 8; - - const uint8_t *next; - if (*tptrp == NULL) - /* This is the first call, return the first option if there is one. */ - next = (const uint8_t *) (ip6e + 1); - else - { - /* Make sure *TPTRP points to a beginning of a new option in - the message. The upper limit is checked in get_opt_end. */ - if (*tptrp < (const uint8_t *) (ip6e + 1)) - return -1; - - /* Get the beginning of the next option. */ - if (get_opt_end (&next, *tptrp, endp) != 0) - return -1; - } - - /* Now search for the appropriate typed entry. */ - const uint8_t *result; - do - { - result = next; - - /* Get the end of this entry. */ - if (get_opt_end (&next, result, endp) != 0) - return -1; - } - while (*result != type); - - /* We know where the next option starts. */ - *tptrp = (uint8_t *) result; - - /* Success. */ - return 0; -} -link_warning (inet6_option_find, - "inet6_option_find is obsolete, use the RFC 3542 interfaces") |