Remove residual blank line at start of MakefileThis is a residual of the $FreeBSD$ removal.MFC After: 3 days (though I'll just run the command on the branches)Sponsored by: Netflix
sys: Remove $FreeBSD$: one-line sh patternRemove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/
Add ipfw_pmod kernel module.The module is designed for modification of a packets of any protocols.For now it implements only TCP MSS modification. It adds the externalaction handler for "tcp-setm
Add ipfw_pmod kernel module.The module is designed for modification of a packets of any protocols.For now it implements only TCP MSS modification. It adds the externalaction handler for "tcp-setmss" action.A rule with tcp-setmss action does additional check for protocol andTCP flags. If SYN flag is present, it parses TCP options and modifiesMSS option if its value is greater than configured value in the rule.Then it adjustes TCP checksum if needed. After handling the searchcontinues with the next rule.Obtained from: Yandex LLCMFC after: 2 weeksRelnotes: yesSponsored by: Yandex LLCNo objection from: #networkDifferential Revision: https://reviews.freebsd.org/D10150
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