Hi, Although rarely used and considered plain evil by some, the kernel code allows one to use IP source routing for TCP.
In tcp_v4_send_synack the following two lines of code are used: [...] __tcp_v4_send_check(skb, ireq->loc_addr, ireq->rmt_addr); [...] err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr,ireq->rmt_addr,ireq->opt); In ip_build_and_send_pkt the 'daddr' parameter is used as follows: iph->daddr = (opt && opt->opt.srr ? opt->opt.faddr : daddr); It looks like the checksum may be off when (opt && opt->opt.srr ) is true? Thanks, Jeroen -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
