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    • 4. 发明申请
    • Efficient CAM-based techniques to perform string searches in packet payloads
    • 有效的基于CAM的技术在分组有效载荷中执行字符串搜索
    • US20060212426A1
    • 2006-09-21
    • US11018942
    • 2004-12-21
    • Udaya ShakaraManoj Paul
    • Udaya ShakaraManoj Paul
    • G06F17/30
    • H04L45/00H04L63/0245H04L63/145H04L67/1002H04L67/1023H04L69/12
    • Efficient Content Addressable Memory (CAM)-based techniques for performing string searches in packet payloads. Hashes are performed on hash keys comprising overlapping sub-strings in one or more search strings. The resulting hash values are stored in a CAM. During packet processing operations, a search of the packet payload data is made to determine if any of the search strings are present. Hashes are performed on non-overlapping sub-strings in the payload data, and the hash results are submitted to the CAM for comparison with the previously-generated search string hash values. If no CAM hits result, the payload data does not contain any of the search strings, while a CAM hit indicates that at least one of the search strings might be present in the payload data. In this instance, a full string comparison is made between the search strings (or an identified search string) and strings in the payload data to verify whether a search string is actually present.
    • 基于有效内容可寻址内存(CAM)的技术,用于在分组有效载荷中执行字符串搜索。 哈希是在包含一个或多个搜索字符串中的重叠子字符串的散列键上执行的。 所得到的散列值存储在CAM中。 在分组处理操作期间,进行分组有效负载数据的搜索以确定是否存在任何搜索字符串。 在有效载荷数据中的非重叠子字符串上执行哈希,并将哈希结果提交给CAM,以便与先前生成的搜索字符串哈希值进行比较。 如果没有CAM命中,则有效载荷数据不包含任何搜索字符串,而CAM命中指示至少有一个搜索字符串可能存在于有效载荷数据中。 在这种情况下,在搜索字符串(或标识的搜索字符串)和有效载荷数据中的字符串之间进行完整字符串比较,以验证搜索字符串是否实际存在。