diff options
Diffstat (limited to 'usr/src/uts/common/inet/tcp_impl.h')
| -rw-r--r-- | usr/src/uts/common/inet/tcp_impl.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/usr/src/uts/common/inet/tcp_impl.h b/usr/src/uts/common/inet/tcp_impl.h index 2f31dc531a..cfbbe84e3a 100644 --- a/usr/src/uts/common/inet/tcp_impl.h +++ b/usr/src/uts/common/inet/tcp_impl.h @@ -109,6 +109,41 @@ extern "C" { } /* + * Before caching the conn IRE, we need to make sure certain TCP + * states are in sync with the ire. The mismatch could occur if the + * TCP state has been set in tcp_adapt_ire() using a different IRE, + * e.g if an address was not present during an initial connect(), + * tcp_adapt_ire() will set the state using the interface route. + * Subsequently, if the address is added to the local machine, the + * retransmitted SYN will get the correct (loopback) IRE, but the TCP + * state (tcp_loopback and tcp_localnet) will remain out of sync. + * This is especially an issue with TCP fusion which relies on the + * TCP state to be accurate. + * + * This check/change should be made only if the TCP is not yet in + * the established state, else it would lead to inconsistencies. + */ +#define TCP_CHECK_IREINFO(tcp, ire) { \ + if ((tcp)->tcp_state < TCPS_ESTABLISHED) { \ + if (((ire)->ire_type & (IRE_LOOPBACK | \ + IRE_LOCAL)) && !(tcp)->tcp_loopback) { \ + (tcp)->tcp_loopback = B_TRUE; \ + } else if ((tcp)->tcp_loopback && \ + !((ire)->ire_type & (IRE_LOOPBACK | IRE_LOCAL))) { \ + (tcp)->tcp_loopback = B_FALSE; \ + } \ + if ((tcp)->tcp_ipversion == IPV4_VERSION) { \ + (tcp)->tcp_localnet = \ + ((ire)->ire_gateway_addr == 0); \ + } else { \ + (tcp)->tcp_localnet = \ + IN6_IS_ADDR_UNSPECIFIED( \ + &(ire)->ire_gateway_addr_v6); \ + } \ + } \ +} + +/* * Write-side flow-control is implemented via the per instance STREAMS * write-side Q by explicitly setting QFULL to stop the flow of mblk_t(s) * and clearing QFULL and calling qbackenable() to restart the flow based |