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Lines 362-367
struct tcp_out_options {
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| 362 |
__u32 tsval, tsecr; /* need to include OPTION_TS */ |
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__u32 tsval, tsecr; /* need to include OPTION_TS */ |
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}; |
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}; |
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/* Beware: Something in the Internet is very sensitive to the ordering of |
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* TCP options, we learned this through the hard way, so be careful here. |
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* Luckily we can at least blame others for their non-compliance but from |
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* inter-operatibility perspective it seems that we're somewhat stuck with |
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* the ordering which we have been using if we want to keep working with |
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* those broken things (not that it currently hurts anybody as there isn't |
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* particular reason why the ordering would need to be changed). |
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* |
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* At least SACK_PERM as the first option is known to lead to a disaster |
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* (but it may well be that other scenarios fail similarly). |
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*/ |
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static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp, |
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static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp, |
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const struct tcp_out_options *opts, |
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const struct tcp_out_options *opts, |
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__u8 **md5_hash) { |
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__u8 **md5_hash) { |
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Lines 376-381
static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp,
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*md5_hash = NULL; |
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*md5_hash = NULL; |
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} |
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} |
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if (unlikely(opts->mss)) { |
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*ptr++ = htonl((TCPOPT_MSS << 24) | |
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(TCPOLEN_MSS << 16) | |
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opts->mss); |
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} |
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| 379 |
if (likely(OPTION_TS & opts->options)) { |
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if (likely(OPTION_TS & opts->options)) { |
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if (unlikely(OPTION_SACK_ADVERTISE & opts->options)) { |
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if (unlikely(OPTION_SACK_ADVERTISE & opts->options)) { |
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*ptr++ = htonl((TCPOPT_SACK_PERM << 24) | |
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*ptr++ = htonl((TCPOPT_SACK_PERM << 24) | |
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Lines 392-403
static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp,
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*ptr++ = htonl(opts->tsecr); |
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*ptr++ = htonl(opts->tsecr); |
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} |
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} |
| 394 |
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| 395 |
if (unlikely(opts->mss)) { |
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| 396 |
*ptr++ = htonl((TCPOPT_MSS << 24) | |
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(TCPOLEN_MSS << 16) | |
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opts->mss); |
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} |
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if (unlikely(OPTION_SACK_ADVERTISE & opts->options && |
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if (unlikely(OPTION_SACK_ADVERTISE & opts->options && |
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!(OPTION_TS & opts->options))) { |
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!(OPTION_TS & opts->options))) { |
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*ptr++ = htonl((TCPOPT_NOP << 24) | |
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*ptr++ = htonl((TCPOPT_NOP << 24) | |
