{'fraction_non_alphanumeric': 0.019559902200488997, 'fraction_numerical': 0.0, 'mean_word_length': 5.612903225806452, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
SIP message classification: design and performance

We present a design sketch of a programmable classification engine for SIP (Session Initiation Protocol) messages and an outline of its implementation in the Linux kernel. In addition to classifying messages, it can extract and maintain state information across multiple messages. We apply the classifier for overload control using operator-specified rules.