diff options
author | Jan Engelhardt <jengelh@medozas.de> | 2011-05-04 17:25:54 +0200 |
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committer | Jan Engelhardt <jengelh@medozas.de> | 2011-05-09 00:45:22 +0200 |
commit | fa9b759bacc0ad6a093892ef508811e7feb981b0 (patch) | |
tree | 1d376d031a0d831d452ef8751f12cd9b24ebc3e9 /xtoptions.c | |
parent | 269cbfd30aac18c1fd251be83430dabc60abee0c (diff) |
libxtables: XTTYPE_PLEN support
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Diffstat (limited to 'xtoptions.c')
-rw-r--r-- | xtoptions.c | 41 |
1 files changed, 27 insertions, 14 deletions
diff --git a/xtoptions.c b/xtoptions.c index 29d05d53..3cc2e0cc 100644 --- a/xtoptions.c +++ b/xtoptions.c @@ -569,14 +569,12 @@ static void xtopt_parse_mport(struct xt_option_call *cb) /** * Parse an integer and ensure it is within the address family's prefix length - * limits. The result is stored in @cb->val.hmask and @cb->val.hlen. If - * %XTOPT_PUT is used, hmask will be copied to the pointed-to area. + * limits. The result is stored in @cb->val.hlen. */ -static void xtopt_parse_plenmask(struct xt_option_call *cb) +static void xtopt_parse_plen(struct xt_option_call *cb) { const struct xt_option_entry *entry = cb->entry; - uint32_t *mask = cb->val.hmask.all; - unsigned int prefix_len = 128; + unsigned int prefix_len = 128; /* happiness is a warm gcc */ cb->val.hlen = (afinfo->family == NFPROTO_IPV4) ? 32 : 128; if (!xtables_strtoui(cb->arg, NULL, &prefix_len, 0, cb->val.hlen)) @@ -586,21 +584,35 @@ static void xtopt_parse_plenmask(struct xt_option_call *cb) cb->ext_name, entry->name, 0, cb->val.hlen); cb->val.hlen = prefix_len; +} + +/** + * Reuse xtopt_parse_plen for testing the integer. Afterwards convert this to + * a bitmask, and make it available through @cb->val.hmask (hlen remains + * valid). If %XTOPT_PUT is used, hmask will be copied to the target area. + */ +static void xtopt_parse_plenmask(struct xt_option_call *cb) +{ + const struct xt_option_entry *entry = cb->entry; + uint32_t *mask = cb->val.hmask.all; + + xtopt_parse_plen(cb); + memset(mask, 0xFF, sizeof(union nf_inet_addr)); /* This shifting is AF-independent. */ - if (prefix_len == 0) { + if (cb->val.hlen == 0) { mask[0] = mask[1] = mask[2] = mask[3] = 0; - } else if (prefix_len <= 32) { - mask[0] <<= 32 - prefix_len; + } else if (cb->val.hlen <= 32) { + mask[0] <<= 32 - cb->val.hlen; mask[1] = mask[2] = mask[3] = 0; - } else if (prefix_len <= 64) { - mask[1] <<= 32 - (prefix_len - 32); + } else if (cb->val.hlen <= 64) { + mask[1] <<= 32 - (cb->val.hlen - 32); mask[2] = mask[3] = 0; - } else if (prefix_len <= 96) { - mask[2] <<= 32 - (prefix_len - 64); + } else if (cb->val.hlen <= 96) { + mask[2] <<= 32 - (cb->val.hlen - 64); mask[3] = 0; - } else if (prefix_len <= 128) { - mask[3] <<= 32 - (prefix_len - 96); + } else if (cb->val.hlen <= 128) { + mask[3] <<= 32 - (cb->val.hlen - 96); } mask[0] = htonl(mask[0]); mask[1] = htonl(mask[1]); @@ -629,6 +641,7 @@ static void (*const xtopt_subparse[])(struct xt_option_call *) = { [XTTYPE_PORT_NE] = xtopt_parse_port, [XTTYPE_PORTRC] = xtopt_parse_mport, [XTTYPE_PORTRC_NE] = xtopt_parse_mport, + [XTTYPE_PLEN] = xtopt_parse_plen, [XTTYPE_PLENMASK] = xtopt_parse_plenmask, }; |