diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/flowspec.c | 268 |
1 files changed, 147 insertions, 121 deletions
diff --git a/lib/flowspec.c b/lib/flowspec.c index ea55b736..764b648e 100644 --- a/lib/flowspec.c +++ b/lib/flowspec.c @@ -929,21 +929,6 @@ get_value(const byte *val, u8 len) return 0; } -static int -is_bitmask(enum flow_type type) -{ - switch (type) - { - case FLOW_TYPE_TCP_FLAGS: - case FLOW_TYPE_FRAGMENT: - case FLOW_TYPE_LABEL: - return 1; - - default: - return 0; - } -} - static const char * fragment_val_str(u8 val) { @@ -957,6 +942,147 @@ fragment_val_str(u8 val) return "???"; } +static void +net_format_flow_ip(buffer *b, const byte *part, int ipv6) +{ + uint pxlen = *(part+1); + if (ipv6) + { + uint pxoffset = *(part+2); + if (pxoffset) + buffer_print(b, "%I6/%u offset %u; ", flow_read_ip6(part+3,pxlen,pxoffset), pxlen, pxoffset); + else + buffer_print(b, "%I6/%u; ", flow_read_ip6(part+3,pxlen,0), pxlen); + } + else + { + buffer_print(b, "%I4/%u; ", flow_read_ip4(part+2,pxlen), pxlen); + } +} + +static void +net_format_flow_num(buffer *b, const byte *part) +{ + const byte *last_op = NULL; + const byte *op = part+1; + u64 val; + uint len; + uint first = 1; + + while (1) + { + if (!first) + { + /* XXX: I don't like this so complicated if-tree */ + if (!isset_and(op) && + ((num_op( op) == FLOW_EQ) || (num_op( op) == FLOW_GTE)) && + ((num_op(last_op) == FLOW_EQ) || (num_op(last_op) == FLOW_LTE))) + { + b->pos--; /* Remove last char (it is a space) */ + buffer_puts(b, ","); + } + else + { + buffer_puts(b, isset_and(op) ? "&& " : "|| "); + } + } + first = 0; + + len = get_value_length(op); + val = get_value(op+1, len); + + if (!isset_end(op) && !isset_and(op) && isset_and(op+1+len) && + (num_op(op) == FLOW_GTE) && (num_op(op+1+len) == FLOW_LTE)) + { + /* Display interval */ + buffer_print(b, "%u..", val); + op += 1 + len; + len = get_value_length(op); + val = get_value(op+1, len); + buffer_print(b, "%u", val); + } + else if (num_op(op) == FLOW_EQ) + { + buffer_print(b, "%u", val); + } + else + { + buffer_print(b, "%s %u", num_op_str(op), val); + } + + if (isset_end(op)) + { + buffer_puts(b, "; "); + break; + } + else + { + buffer_puts(b, " "); + } + + last_op = op; + op += 1 + len; + } +} + +static void +net_format_flow_bitmask(buffer *b, const byte *part) +{ + const byte *op = part+1; + u64 val; + uint len; + uint first = 1; + + while (1) + { + if (!first) + { + if (isset_and(op)) + { + b->pos--; /* Remove last char (it is a space) */ + buffer_puts(b, ","); + } + else + { + buffer_puts(b, "|| "); + } + } + first = 0; + + len = get_value_length(op); + val = get_value(op+1, len); + + /* + * Not Match Show + * ------------------ + * 0 0 !0/B + * 0 1 B/B + * 1 0 0/B + * 1 1 !B/B + */ + + if ((*op & 0x3) == 0x3 || (*op & 0x3) == 0) + buffer_puts(b, "!"); + + if (*part == FLOW_TYPE_FRAGMENT && (val == 1 || val == 2 || val == 4 || val == 8)) + buffer_print(b, "%s%s", ((*op & 0x1) ? "" : "!"), fragment_val_str(val)); + else + buffer_print(b, "0x%x/0x%x", ((*op & 0x1) ? val : 0), val); + + if (isset_end(op)) + { + buffer_puts(b, "; "); + break; + } + else + { + buffer_puts(b, " "); + } + + op += 1 + len; + } +} + static uint net_format_flow(char *buf, uint blen, const byte *data, uint dlen, int ipv6) { @@ -982,123 +1108,23 @@ net_format_flow(char *buf, uint blen, const byte *data, uint dlen, int ipv6) { case FLOW_TYPE_DST_PREFIX: case FLOW_TYPE_SRC_PREFIX: - { - uint pxlen = *(part+1); - if (ipv6) - { - uint pxoffset = *(part+2); - if (pxoffset) - buffer_print(&b, "%I6/%u offset %u; ", flow_read_ip6(part+3,pxlen,pxoffset), pxlen, pxoffset); - else - buffer_print(&b, "%I6/%u; ", flow_read_ip6(part+3,pxlen,0), pxlen); - } - else - { - buffer_print(&b, "%I4/%u; ", flow_read_ip4(part+2,pxlen), pxlen); - } + net_format_flow_ip(&b, part, ipv6); break; - } - case FLOW_TYPE_IP_PROTOCOL: /* == FLOW_TYPE_NEXT_HEADER */ case FLOW_TYPE_PORT: case FLOW_TYPE_DST_PORT: case FLOW_TYPE_SRC_PORT: case FLOW_TYPE_ICMP_TYPE: case FLOW_TYPE_ICMP_CODE: - case FLOW_TYPE_TCP_FLAGS: case FLOW_TYPE_PACKET_LENGTH: case FLOW_TYPE_DSCP: + net_format_flow_num(&b, part); + break; + case FLOW_TYPE_TCP_FLAGS: case FLOW_TYPE_FRAGMENT: case FLOW_TYPE_LABEL: - { - const byte *last_op = NULL; - const byte *op = part+1; - u64 val; - uint len; - uint first = 1; - - while (1) - { - if (!first) - { - /* XXX: I don't like this so complicated if-tree */ - if (!isset_and(op) && !is_bitmask(*part) && - ((num_op( op) == FLOW_EQ) || (num_op( op) == FLOW_GTE)) && - ((num_op(last_op) == FLOW_EQ) || (num_op(last_op) == FLOW_LTE))) - { - b.pos--; /* Remove last char (it is a space) */ - buffer_puts(&b, ","); - } - else if (isset_and(op) && is_bitmask(*part)) - { - b.pos--; /* Remove last char (it is a space) */ - buffer_puts(&b, ","); - } - else - { - buffer_puts(&b, isset_and(op) ? "&& " : "|| "); - } - } - first = 0; - - len = get_value_length(op); - val = get_value(op+1, len); - - if (is_bitmask(*part)) - { - /* - * Not Match Show - * ------------------ - * 0 0 !0/B - * 0 1 B/B - * 1 0 0/B - * 1 1 !B/B - */ - - if ((*op & 0x3) == 0x3 || (*op & 0x3) == 0) - buffer_puts(&b, "!"); - - if (*part == FLOW_TYPE_FRAGMENT && (val == 1 || val == 2 || val == 4 || val == 8)) - buffer_print(&b, "%s%s", ((*op & 0x1) ? "" : "!"), fragment_val_str(val)); - else - buffer_print(&b, "0x%x/0x%x", ((*op & 0x1) ? val : 0), val); - } - else - { - if (!isset_end(op) && !isset_and(op) && isset_and(op+1+len) && - (num_op(op) == FLOW_GTE) && (num_op(op+1+len) == FLOW_LTE)) - { - /* Display interval */ - buffer_print(&b, "%u..", val); - op += 1 + len; - len = get_value_length(op); - val = get_value(op+1, len); - buffer_print(&b, "%u", val); - } - else if (num_op(op) == FLOW_EQ) - { - buffer_print(&b, "%u", val); - } - else - { - buffer_print(&b, "%s %u", num_op_str(op), val); - } - } - - if (isset_end(op)) - { - buffer_puts(&b, "; "); - break; - } - else - { - buffer_puts(&b, " "); - } - - last_op = op; - op += 1 + len; - } - } + net_format_flow_bitmask(&b, part); + break; } part = flow_next_part(part, data+dlen, ipv6); |